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, struct ifa6_config *cfg, 990 bool can_block, struct netlink_ext_ack *extack) 991 { 992 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 993 int addr_type = ipv6_addr_type(cfg->pfx); 994 struct net *net = dev_net(idev->dev); 995 struct inet6_ifaddr *ifa = NULL; 996 struct fib6_info *f6i = NULL; 997 int err = 0; 998 999 if (addr_type == IPV6_ADDR_ANY || 1000 addr_type & IPV6_ADDR_MULTICAST || 1001 (!(idev->dev->flags & IFF_LOOPBACK) && 1002 addr_type & IPV6_ADDR_LOOPBACK)) 1003 return ERR_PTR(-EADDRNOTAVAIL); 1004 1005 if (idev->dead) { 1006 err = -ENODEV; /*XXX*/ 1007 goto out; 1008 } 1009 1010 if (idev->cnf.disable_ipv6) { 1011 err = -EACCES; 1012 goto out; 1013 } 1014 1015 /* validator notifier needs to be blocking; 1016 * do not call in atomic context 1017 */ 1018 if (can_block) { 1019 struct in6_validator_info i6vi = { 1020 .i6vi_addr = *cfg->pfx, 1021 .i6vi_dev = idev, 1022 .extack = extack, 1023 }; 1024 1025 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1026 err = notifier_to_errno(err); 1027 if (err < 0) 1028 goto out; 1029 } 1030 1031 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1032 if (!ifa) { 1033 err = -ENOBUFS; 1034 goto out; 1035 } 1036 1037 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1038 if (IS_ERR(f6i)) { 1039 err = PTR_ERR(f6i); 1040 f6i = NULL; 1041 goto out; 1042 } 1043 1044 if (net->ipv6.devconf_all->disable_policy || 1045 idev->cnf.disable_policy) 1046 f6i->dst_nopolicy = true; 1047 1048 neigh_parms_data_state_setall(idev->nd_parms); 1049 1050 ifa->addr = *cfg->pfx; 1051 if (cfg->peer_pfx) 1052 ifa->peer_addr = *cfg->peer_pfx; 1053 1054 spin_lock_init(&ifa->lock); 1055 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1056 INIT_HLIST_NODE(&ifa->addr_lst); 1057 ifa->scope = cfg->scope; 1058 ifa->prefix_len = cfg->plen; 1059 ifa->rt_priority = cfg->rt_priority; 1060 ifa->flags = cfg->ifa_flags; 1061 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1062 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1063 ifa->flags |= IFA_F_TENTATIVE; 1064 ifa->valid_lft = cfg->valid_lft; 1065 ifa->prefered_lft = cfg->preferred_lft; 1066 ifa->cstamp = ifa->tstamp = jiffies; 1067 ifa->tokenized = false; 1068 1069 ifa->rt = f6i; 1070 1071 ifa->idev = idev; 1072 in6_dev_hold(idev); 1073 1074 /* For caller */ 1075 refcount_set(&ifa->refcnt, 1); 1076 1077 rcu_read_lock_bh(); 1078 1079 err = ipv6_add_addr_hash(idev->dev, ifa); 1080 if (err < 0) { 1081 rcu_read_unlock_bh(); 1082 goto out; 1083 } 1084 1085 write_lock(&idev->lock); 1086 1087 /* Add to inet6_dev unicast addr list. */ 1088 ipv6_link_dev_addr(idev, ifa); 1089 1090 if (ifa->flags&IFA_F_TEMPORARY) { 1091 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1092 in6_ifa_hold(ifa); 1093 } 1094 1095 in6_ifa_hold(ifa); 1096 write_unlock(&idev->lock); 1097 1098 rcu_read_unlock_bh(); 1099 1100 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1101 out: 1102 if (unlikely(err < 0)) { 1103 fib6_info_release(f6i); 1104 1105 if (ifa) { 1106 if (ifa->idev) 1107 in6_dev_put(ifa->idev); 1108 kfree(ifa); 1109 } 1110 ifa = ERR_PTR(err); 1111 } 1112 1113 return ifa; 1114 } 1115 1116 enum cleanup_prefix_rt_t { 1117 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1118 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1119 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1120 }; 1121 1122 /* 1123 * Check, whether the prefix for ifp would still need a prefix route 1124 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1125 * constants. 1126 * 1127 * 1) we don't purge prefix if address was not permanent. 1128 * prefix is managed by its own lifetime. 1129 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1130 * 3) if there are no addresses, delete prefix. 1131 * 4) if there are still other permanent address(es), 1132 * corresponding prefix is still permanent. 1133 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1134 * don't purge the prefix, assume user space is managing it. 1135 * 6) otherwise, update prefix lifetime to the 1136 * longest valid lifetime among the corresponding 1137 * addresses on the device. 1138 * Note: subsequent RA will update lifetime. 1139 **/ 1140 static enum cleanup_prefix_rt_t 1141 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1142 { 1143 struct inet6_ifaddr *ifa; 1144 struct inet6_dev *idev = ifp->idev; 1145 unsigned long lifetime; 1146 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1147 1148 *expires = jiffies; 1149 1150 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1151 if (ifa == ifp) 1152 continue; 1153 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1154 ifp->prefix_len)) 1155 continue; 1156 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1157 return CLEANUP_PREFIX_RT_NOP; 1158 1159 action = CLEANUP_PREFIX_RT_EXPIRE; 1160 1161 spin_lock(&ifa->lock); 1162 1163 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1164 /* 1165 * Note: Because this address is 1166 * not permanent, lifetime < 1167 * LONG_MAX / HZ here. 1168 */ 1169 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1170 *expires = ifa->tstamp + lifetime * HZ; 1171 spin_unlock(&ifa->lock); 1172 } 1173 1174 return action; 1175 } 1176 1177 static void 1178 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1179 { 1180 struct fib6_info *f6i; 1181 1182 f6i = addrconf_get_prefix_route(&ifp->addr, 1183 ifp->prefix_len, 1184 ifp->idev->dev, 1185 0, RTF_GATEWAY | RTF_DEFAULT); 1186 if (f6i) { 1187 if (del_rt) 1188 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1189 else { 1190 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1191 fib6_set_expires(f6i, expires); 1192 fib6_info_release(f6i); 1193 } 1194 } 1195 } 1196 1197 1198 /* This function wants to get referenced ifp and releases it before return */ 1199 1200 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1201 { 1202 int state; 1203 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1204 unsigned long expires; 1205 1206 ASSERT_RTNL(); 1207 1208 spin_lock_bh(&ifp->lock); 1209 state = ifp->state; 1210 ifp->state = INET6_IFADDR_STATE_DEAD; 1211 spin_unlock_bh(&ifp->lock); 1212 1213 if (state == INET6_IFADDR_STATE_DEAD) 1214 goto out; 1215 1216 spin_lock_bh(&addrconf_hash_lock); 1217 hlist_del_init_rcu(&ifp->addr_lst); 1218 spin_unlock_bh(&addrconf_hash_lock); 1219 1220 write_lock_bh(&ifp->idev->lock); 1221 1222 if (ifp->flags&IFA_F_TEMPORARY) { 1223 list_del(&ifp->tmp_list); 1224 if (ifp->ifpub) { 1225 in6_ifa_put(ifp->ifpub); 1226 ifp->ifpub = NULL; 1227 } 1228 __in6_ifa_put(ifp); 1229 } 1230 1231 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1232 action = check_cleanup_prefix_route(ifp, &expires); 1233 1234 list_del_rcu(&ifp->if_list); 1235 __in6_ifa_put(ifp); 1236 1237 write_unlock_bh(&ifp->idev->lock); 1238 1239 addrconf_del_dad_work(ifp); 1240 1241 ipv6_ifa_notify(RTM_DELADDR, ifp); 1242 1243 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1244 1245 if (action != CLEANUP_PREFIX_RT_NOP) { 1246 cleanup_prefix_route(ifp, expires, 1247 action == CLEANUP_PREFIX_RT_DEL); 1248 } 1249 1250 /* clean up prefsrc entries */ 1251 rt6_remove_prefsrc(ifp); 1252 out: 1253 in6_ifa_put(ifp); 1254 } 1255 1256 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1257 struct inet6_ifaddr *ift, 1258 bool block) 1259 { 1260 struct inet6_dev *idev = ifp->idev; 1261 struct in6_addr addr, *tmpaddr; 1262 unsigned long tmp_tstamp, age; 1263 unsigned long regen_advance; 1264 struct ifa6_config cfg; 1265 int ret = 0; 1266 unsigned long now = jiffies; 1267 long max_desync_factor; 1268 s32 cnf_temp_preferred_lft; 1269 1270 write_lock_bh(&idev->lock); 1271 if (ift) { 1272 spin_lock_bh(&ift->lock); 1273 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1274 spin_unlock_bh(&ift->lock); 1275 tmpaddr = &addr; 1276 } else { 1277 tmpaddr = NULL; 1278 } 1279 retry: 1280 in6_dev_hold(idev); 1281 if (idev->cnf.use_tempaddr <= 0) { 1282 write_unlock_bh(&idev->lock); 1283 pr_info("%s: use_tempaddr is disabled\n", __func__); 1284 in6_dev_put(idev); 1285 ret = -1; 1286 goto out; 1287 } 1288 spin_lock_bh(&ifp->lock); 1289 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1290 idev->cnf.use_tempaddr = -1; /*XXX*/ 1291 spin_unlock_bh(&ifp->lock); 1292 write_unlock_bh(&idev->lock); 1293 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1294 __func__); 1295 in6_dev_put(idev); 1296 ret = -1; 1297 goto out; 1298 } 1299 in6_ifa_hold(ifp); 1300 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1301 ipv6_try_regen_rndid(idev, tmpaddr); 1302 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1303 age = (now - ifp->tstamp) / HZ; 1304 1305 regen_advance = idev->cnf.regen_max_retry * 1306 idev->cnf.dad_transmits * 1307 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1308 1309 /* recalculate max_desync_factor each time and update 1310 * idev->desync_factor if it's larger 1311 */ 1312 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1313 max_desync_factor = min_t(__u32, 1314 idev->cnf.max_desync_factor, 1315 cnf_temp_preferred_lft - regen_advance); 1316 1317 if (unlikely(idev->desync_factor > max_desync_factor)) { 1318 if (max_desync_factor > 0) { 1319 get_random_bytes(&idev->desync_factor, 1320 sizeof(idev->desync_factor)); 1321 idev->desync_factor %= max_desync_factor; 1322 } else { 1323 idev->desync_factor = 0; 1324 } 1325 } 1326 1327 memset(&cfg, 0, sizeof(cfg)); 1328 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1329 idev->cnf.temp_valid_lft + age); 1330 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1331 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1332 1333 cfg.plen = ifp->prefix_len; 1334 tmp_tstamp = ifp->tstamp; 1335 spin_unlock_bh(&ifp->lock); 1336 1337 write_unlock_bh(&idev->lock); 1338 1339 /* A temporary address is created only if this calculated Preferred 1340 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1341 * an implementation must not create a temporary address with a zero 1342 * Preferred Lifetime. 1343 * Use age calculation as in addrconf_verify to avoid unnecessary 1344 * temporary addresses being generated. 1345 */ 1346 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1347 if (cfg.preferred_lft <= regen_advance + age) { 1348 in6_ifa_put(ifp); 1349 in6_dev_put(idev); 1350 ret = -1; 1351 goto out; 1352 } 1353 1354 cfg.ifa_flags = IFA_F_TEMPORARY; 1355 /* set in addrconf_prefix_rcv() */ 1356 if (ifp->flags & IFA_F_OPTIMISTIC) 1357 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1358 1359 cfg.pfx = &addr; 1360 cfg.scope = ipv6_addr_scope(cfg.pfx); 1361 1362 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1363 if (IS_ERR(ift)) { 1364 in6_ifa_put(ifp); 1365 in6_dev_put(idev); 1366 pr_info("%s: retry temporary address regeneration\n", __func__); 1367 tmpaddr = &addr; 1368 write_lock_bh(&idev->lock); 1369 goto retry; 1370 } 1371 1372 spin_lock_bh(&ift->lock); 1373 ift->ifpub = ifp; 1374 ift->cstamp = now; 1375 ift->tstamp = tmp_tstamp; 1376 spin_unlock_bh(&ift->lock); 1377 1378 addrconf_dad_start(ift); 1379 in6_ifa_put(ift); 1380 in6_dev_put(idev); 1381 out: 1382 return ret; 1383 } 1384 1385 /* 1386 * Choose an appropriate source address (RFC3484) 1387 */ 1388 enum { 1389 IPV6_SADDR_RULE_INIT = 0, 1390 IPV6_SADDR_RULE_LOCAL, 1391 IPV6_SADDR_RULE_SCOPE, 1392 IPV6_SADDR_RULE_PREFERRED, 1393 #ifdef CONFIG_IPV6_MIP6 1394 IPV6_SADDR_RULE_HOA, 1395 #endif 1396 IPV6_SADDR_RULE_OIF, 1397 IPV6_SADDR_RULE_LABEL, 1398 IPV6_SADDR_RULE_PRIVACY, 1399 IPV6_SADDR_RULE_ORCHID, 1400 IPV6_SADDR_RULE_PREFIX, 1401 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1402 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1403 #endif 1404 IPV6_SADDR_RULE_MAX 1405 }; 1406 1407 struct ipv6_saddr_score { 1408 int rule; 1409 int addr_type; 1410 struct inet6_ifaddr *ifa; 1411 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1412 int scopedist; 1413 int matchlen; 1414 }; 1415 1416 struct ipv6_saddr_dst { 1417 const struct in6_addr *addr; 1418 int ifindex; 1419 int scope; 1420 int label; 1421 unsigned int prefs; 1422 }; 1423 1424 static inline int ipv6_saddr_preferred(int type) 1425 { 1426 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1427 return 1; 1428 return 0; 1429 } 1430 1431 static bool ipv6_use_optimistic_addr(struct net *net, 1432 struct inet6_dev *idev) 1433 { 1434 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1435 if (!idev) 1436 return false; 1437 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1438 return false; 1439 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1440 return false; 1441 1442 return true; 1443 #else 1444 return false; 1445 #endif 1446 } 1447 1448 static bool ipv6_allow_optimistic_dad(struct net *net, 1449 struct inet6_dev *idev) 1450 { 1451 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1452 if (!idev) 1453 return false; 1454 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1455 return false; 1456 1457 return true; 1458 #else 1459 return false; 1460 #endif 1461 } 1462 1463 static int ipv6_get_saddr_eval(struct net *net, 1464 struct ipv6_saddr_score *score, 1465 struct ipv6_saddr_dst *dst, 1466 int i) 1467 { 1468 int ret; 1469 1470 if (i <= score->rule) { 1471 switch (i) { 1472 case IPV6_SADDR_RULE_SCOPE: 1473 ret = score->scopedist; 1474 break; 1475 case IPV6_SADDR_RULE_PREFIX: 1476 ret = score->matchlen; 1477 break; 1478 default: 1479 ret = !!test_bit(i, score->scorebits); 1480 } 1481 goto out; 1482 } 1483 1484 switch (i) { 1485 case IPV6_SADDR_RULE_INIT: 1486 /* Rule 0: remember if hiscore is not ready yet */ 1487 ret = !!score->ifa; 1488 break; 1489 case IPV6_SADDR_RULE_LOCAL: 1490 /* Rule 1: Prefer same address */ 1491 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1492 break; 1493 case IPV6_SADDR_RULE_SCOPE: 1494 /* Rule 2: Prefer appropriate scope 1495 * 1496 * ret 1497 * ^ 1498 * -1 | d 15 1499 * ---+--+-+---> scope 1500 * | 1501 * | d is scope of the destination. 1502 * B-d | \ 1503 * | \ <- smaller scope is better if 1504 * B-15 | \ if scope is enough for destination. 1505 * | ret = B - scope (-1 <= scope >= d <= 15). 1506 * d-C-1 | / 1507 * |/ <- greater is better 1508 * -C / if scope is not enough for destination. 1509 * /| ret = scope - C (-1 <= d < scope <= 15). 1510 * 1511 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1512 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1513 * Assume B = 0 and we get C > 29. 1514 */ 1515 ret = __ipv6_addr_src_scope(score->addr_type); 1516 if (ret >= dst->scope) 1517 ret = -ret; 1518 else 1519 ret -= 128; /* 30 is enough */ 1520 score->scopedist = ret; 1521 break; 1522 case IPV6_SADDR_RULE_PREFERRED: 1523 { 1524 /* Rule 3: Avoid deprecated and optimistic addresses */ 1525 u8 avoid = IFA_F_DEPRECATED; 1526 1527 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1528 avoid |= IFA_F_OPTIMISTIC; 1529 ret = ipv6_saddr_preferred(score->addr_type) || 1530 !(score->ifa->flags & avoid); 1531 break; 1532 } 1533 #ifdef CONFIG_IPV6_MIP6 1534 case IPV6_SADDR_RULE_HOA: 1535 { 1536 /* Rule 4: Prefer home address */ 1537 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1538 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1539 break; 1540 } 1541 #endif 1542 case IPV6_SADDR_RULE_OIF: 1543 /* Rule 5: Prefer outgoing interface */ 1544 ret = (!dst->ifindex || 1545 dst->ifindex == score->ifa->idev->dev->ifindex); 1546 break; 1547 case IPV6_SADDR_RULE_LABEL: 1548 /* Rule 6: Prefer matching label */ 1549 ret = ipv6_addr_label(net, 1550 &score->ifa->addr, score->addr_type, 1551 score->ifa->idev->dev->ifindex) == dst->label; 1552 break; 1553 case IPV6_SADDR_RULE_PRIVACY: 1554 { 1555 /* Rule 7: Prefer public address 1556 * Note: prefer temporary address if use_tempaddr >= 2 1557 */ 1558 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1559 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1560 score->ifa->idev->cnf.use_tempaddr >= 2; 1561 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1562 break; 1563 } 1564 case IPV6_SADDR_RULE_ORCHID: 1565 /* Rule 8-: Prefer ORCHID vs ORCHID or 1566 * non-ORCHID vs non-ORCHID 1567 */ 1568 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1569 ipv6_addr_orchid(dst->addr)); 1570 break; 1571 case IPV6_SADDR_RULE_PREFIX: 1572 /* Rule 8: Use longest matching prefix */ 1573 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1574 if (ret > score->ifa->prefix_len) 1575 ret = score->ifa->prefix_len; 1576 score->matchlen = ret; 1577 break; 1578 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1579 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1580 /* Optimistic addresses still have lower precedence than other 1581 * preferred addresses. 1582 */ 1583 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1584 break; 1585 #endif 1586 default: 1587 ret = 0; 1588 } 1589 1590 if (ret) 1591 __set_bit(i, score->scorebits); 1592 score->rule = i; 1593 out: 1594 return ret; 1595 } 1596 1597 static int __ipv6_dev_get_saddr(struct net *net, 1598 struct ipv6_saddr_dst *dst, 1599 struct inet6_dev *idev, 1600 struct ipv6_saddr_score *scores, 1601 int hiscore_idx) 1602 { 1603 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1604 1605 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1606 int i; 1607 1608 /* 1609 * - Tentative Address (RFC2462 section 5.4) 1610 * - A tentative address is not considered 1611 * "assigned to an interface" in the traditional 1612 * sense, unless it is also flagged as optimistic. 1613 * - Candidate Source Address (section 4) 1614 * - In any case, anycast addresses, multicast 1615 * addresses, and the unspecified address MUST 1616 * NOT be included in a candidate set. 1617 */ 1618 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1619 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1620 continue; 1621 1622 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1623 1624 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1625 score->addr_type & IPV6_ADDR_MULTICAST)) { 1626 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1627 idev->dev->name); 1628 continue; 1629 } 1630 1631 score->rule = -1; 1632 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1633 1634 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1635 int minihiscore, miniscore; 1636 1637 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1638 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1639 1640 if (minihiscore > miniscore) { 1641 if (i == IPV6_SADDR_RULE_SCOPE && 1642 score->scopedist > 0) { 1643 /* 1644 * special case: 1645 * each remaining entry 1646 * has too small (not enough) 1647 * scope, because ifa entries 1648 * are sorted by their scope 1649 * values. 1650 */ 1651 goto out; 1652 } 1653 break; 1654 } else if (minihiscore < miniscore) { 1655 swap(hiscore, score); 1656 hiscore_idx = 1 - hiscore_idx; 1657 1658 /* restore our iterator */ 1659 score->ifa = hiscore->ifa; 1660 1661 break; 1662 } 1663 } 1664 } 1665 out: 1666 return hiscore_idx; 1667 } 1668 1669 static int ipv6_get_saddr_master(struct net *net, 1670 const struct net_device *dst_dev, 1671 const struct net_device *master, 1672 struct ipv6_saddr_dst *dst, 1673 struct ipv6_saddr_score *scores, 1674 int hiscore_idx) 1675 { 1676 struct inet6_dev *idev; 1677 1678 idev = __in6_dev_get(dst_dev); 1679 if (idev) 1680 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1681 scores, hiscore_idx); 1682 1683 idev = __in6_dev_get(master); 1684 if (idev) 1685 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1686 scores, hiscore_idx); 1687 1688 return hiscore_idx; 1689 } 1690 1691 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1692 const struct in6_addr *daddr, unsigned int prefs, 1693 struct in6_addr *saddr) 1694 { 1695 struct ipv6_saddr_score scores[2], *hiscore; 1696 struct ipv6_saddr_dst dst; 1697 struct inet6_dev *idev; 1698 struct net_device *dev; 1699 int dst_type; 1700 bool use_oif_addr = false; 1701 int hiscore_idx = 0; 1702 int ret = 0; 1703 1704 dst_type = __ipv6_addr_type(daddr); 1705 dst.addr = daddr; 1706 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1707 dst.scope = __ipv6_addr_src_scope(dst_type); 1708 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1709 dst.prefs = prefs; 1710 1711 scores[hiscore_idx].rule = -1; 1712 scores[hiscore_idx].ifa = NULL; 1713 1714 rcu_read_lock(); 1715 1716 /* Candidate Source Address (section 4) 1717 * - multicast and link-local destination address, 1718 * the set of candidate source address MUST only 1719 * include addresses assigned to interfaces 1720 * belonging to the same link as the outgoing 1721 * interface. 1722 * (- For site-local destination addresses, the 1723 * set of candidate source addresses MUST only 1724 * include addresses assigned to interfaces 1725 * belonging to the same site as the outgoing 1726 * interface.) 1727 * - "It is RECOMMENDED that the candidate source addresses 1728 * be the set of unicast addresses assigned to the 1729 * interface that will be used to send to the destination 1730 * (the 'outgoing' interface)." (RFC 6724) 1731 */ 1732 if (dst_dev) { 1733 idev = __in6_dev_get(dst_dev); 1734 if ((dst_type & IPV6_ADDR_MULTICAST) || 1735 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1736 (idev && idev->cnf.use_oif_addrs_only)) { 1737 use_oif_addr = true; 1738 } 1739 } 1740 1741 if (use_oif_addr) { 1742 if (idev) 1743 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1744 } else { 1745 const struct net_device *master; 1746 int master_idx = 0; 1747 1748 /* if dst_dev exists and is enslaved to an L3 device, then 1749 * prefer addresses from dst_dev and then the master over 1750 * any other enslaved devices in the L3 domain. 1751 */ 1752 master = l3mdev_master_dev_rcu(dst_dev); 1753 if (master) { 1754 master_idx = master->ifindex; 1755 1756 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1757 master, &dst, 1758 scores, hiscore_idx); 1759 1760 if (scores[hiscore_idx].ifa) 1761 goto out; 1762 } 1763 1764 for_each_netdev_rcu(net, dev) { 1765 /* only consider addresses on devices in the 1766 * same L3 domain 1767 */ 1768 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1769 continue; 1770 idev = __in6_dev_get(dev); 1771 if (!idev) 1772 continue; 1773 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1774 } 1775 } 1776 1777 out: 1778 hiscore = &scores[hiscore_idx]; 1779 if (!hiscore->ifa) 1780 ret = -EADDRNOTAVAIL; 1781 else 1782 *saddr = hiscore->ifa->addr; 1783 1784 rcu_read_unlock(); 1785 return ret; 1786 } 1787 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1788 1789 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1790 u32 banned_flags) 1791 { 1792 struct inet6_ifaddr *ifp; 1793 int err = -EADDRNOTAVAIL; 1794 1795 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1796 if (ifp->scope > IFA_LINK) 1797 break; 1798 if (ifp->scope == IFA_LINK && 1799 !(ifp->flags & banned_flags)) { 1800 *addr = ifp->addr; 1801 err = 0; 1802 break; 1803 } 1804 } 1805 return err; 1806 } 1807 1808 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1809 u32 banned_flags) 1810 { 1811 struct inet6_dev *idev; 1812 int err = -EADDRNOTAVAIL; 1813 1814 rcu_read_lock(); 1815 idev = __in6_dev_get(dev); 1816 if (idev) { 1817 read_lock_bh(&idev->lock); 1818 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1819 read_unlock_bh(&idev->lock); 1820 } 1821 rcu_read_unlock(); 1822 return err; 1823 } 1824 1825 static int ipv6_count_addresses(const struct inet6_dev *idev) 1826 { 1827 const struct inet6_ifaddr *ifp; 1828 int cnt = 0; 1829 1830 rcu_read_lock(); 1831 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1832 cnt++; 1833 rcu_read_unlock(); 1834 return cnt; 1835 } 1836 1837 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1838 const struct net_device *dev, int strict) 1839 { 1840 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1841 strict, IFA_F_TENTATIVE); 1842 } 1843 EXPORT_SYMBOL(ipv6_chk_addr); 1844 1845 /* device argument is used to find the L3 domain of interest. If 1846 * skip_dev_check is set, then the ifp device is not checked against 1847 * the passed in dev argument. So the 2 cases for addresses checks are: 1848 * 1. does the address exist in the L3 domain that dev is part of 1849 * (skip_dev_check = true), or 1850 * 1851 * 2. does the address exist on the specific device 1852 * (skip_dev_check = false) 1853 */ 1854 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1855 const struct net_device *dev, bool skip_dev_check, 1856 int strict, u32 banned_flags) 1857 { 1858 unsigned int hash = inet6_addr_hash(net, addr); 1859 const struct net_device *l3mdev; 1860 struct inet6_ifaddr *ifp; 1861 u32 ifp_flags; 1862 1863 rcu_read_lock(); 1864 1865 l3mdev = l3mdev_master_dev_rcu(dev); 1866 if (skip_dev_check) 1867 dev = NULL; 1868 1869 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1870 if (!net_eq(dev_net(ifp->idev->dev), net)) 1871 continue; 1872 1873 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1874 continue; 1875 1876 /* Decouple optimistic from tentative for evaluation here. 1877 * Ban optimistic addresses explicitly, when required. 1878 */ 1879 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1880 ? (ifp->flags&~IFA_F_TENTATIVE) 1881 : ifp->flags; 1882 if (ipv6_addr_equal(&ifp->addr, addr) && 1883 !(ifp_flags&banned_flags) && 1884 (!dev || ifp->idev->dev == dev || 1885 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1886 rcu_read_unlock(); 1887 return 1; 1888 } 1889 } 1890 1891 rcu_read_unlock(); 1892 return 0; 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1895 1896 1897 /* Compares an address/prefix_len with addresses on device @dev. 1898 * If one is found it returns true. 1899 */ 1900 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1901 const unsigned int prefix_len, struct net_device *dev) 1902 { 1903 const struct inet6_ifaddr *ifa; 1904 const struct inet6_dev *idev; 1905 bool ret = false; 1906 1907 rcu_read_lock(); 1908 idev = __in6_dev_get(dev); 1909 if (idev) { 1910 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1911 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1912 if (ret) 1913 break; 1914 } 1915 } 1916 rcu_read_unlock(); 1917 1918 return ret; 1919 } 1920 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1921 1922 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1923 { 1924 const struct inet6_ifaddr *ifa; 1925 const struct inet6_dev *idev; 1926 int onlink; 1927 1928 onlink = 0; 1929 rcu_read_lock(); 1930 idev = __in6_dev_get(dev); 1931 if (idev) { 1932 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1933 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1934 ifa->prefix_len); 1935 if (onlink) 1936 break; 1937 } 1938 } 1939 rcu_read_unlock(); 1940 return onlink; 1941 } 1942 EXPORT_SYMBOL(ipv6_chk_prefix); 1943 1944 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1945 struct net_device *dev, int strict) 1946 { 1947 unsigned int hash = inet6_addr_hash(net, addr); 1948 struct inet6_ifaddr *ifp, *result = NULL; 1949 1950 rcu_read_lock(); 1951 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1952 if (!net_eq(dev_net(ifp->idev->dev), net)) 1953 continue; 1954 if (ipv6_addr_equal(&ifp->addr, addr)) { 1955 if (!dev || ifp->idev->dev == dev || 1956 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1957 result = ifp; 1958 in6_ifa_hold(ifp); 1959 break; 1960 } 1961 } 1962 } 1963 rcu_read_unlock(); 1964 1965 return result; 1966 } 1967 1968 /* Gets referenced address, destroys ifaddr */ 1969 1970 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1971 { 1972 if (dad_failed) 1973 ifp->flags |= IFA_F_DADFAILED; 1974 1975 if (ifp->flags&IFA_F_TEMPORARY) { 1976 struct inet6_ifaddr *ifpub; 1977 spin_lock_bh(&ifp->lock); 1978 ifpub = ifp->ifpub; 1979 if (ifpub) { 1980 in6_ifa_hold(ifpub); 1981 spin_unlock_bh(&ifp->lock); 1982 ipv6_create_tempaddr(ifpub, ifp, true); 1983 in6_ifa_put(ifpub); 1984 } else { 1985 spin_unlock_bh(&ifp->lock); 1986 } 1987 ipv6_del_addr(ifp); 1988 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1989 spin_lock_bh(&ifp->lock); 1990 addrconf_del_dad_work(ifp); 1991 ifp->flags |= IFA_F_TENTATIVE; 1992 if (dad_failed) 1993 ifp->flags &= ~IFA_F_OPTIMISTIC; 1994 spin_unlock_bh(&ifp->lock); 1995 if (dad_failed) 1996 ipv6_ifa_notify(0, ifp); 1997 in6_ifa_put(ifp); 1998 } else { 1999 ipv6_del_addr(ifp); 2000 } 2001 } 2002 2003 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2004 { 2005 int err = -ENOENT; 2006 2007 spin_lock_bh(&ifp->lock); 2008 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2009 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2010 err = 0; 2011 } 2012 spin_unlock_bh(&ifp->lock); 2013 2014 return err; 2015 } 2016 2017 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2018 { 2019 struct inet6_dev *idev = ifp->idev; 2020 struct net *net = dev_net(ifp->idev->dev); 2021 2022 if (addrconf_dad_end(ifp)) { 2023 in6_ifa_put(ifp); 2024 return; 2025 } 2026 2027 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2028 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2029 2030 spin_lock_bh(&ifp->lock); 2031 2032 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2033 struct in6_addr new_addr; 2034 struct inet6_ifaddr *ifp2; 2035 int retries = ifp->stable_privacy_retry + 1; 2036 struct ifa6_config cfg = { 2037 .pfx = &new_addr, 2038 .plen = ifp->prefix_len, 2039 .ifa_flags = ifp->flags, 2040 .valid_lft = ifp->valid_lft, 2041 .preferred_lft = ifp->prefered_lft, 2042 .scope = ifp->scope, 2043 }; 2044 2045 if (retries > net->ipv6.sysctl.idgen_retries) { 2046 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2047 ifp->idev->dev->name); 2048 goto errdad; 2049 } 2050 2051 new_addr = ifp->addr; 2052 if (ipv6_generate_stable_address(&new_addr, retries, 2053 idev)) 2054 goto errdad; 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, &cfg, false, NULL); 2067 if (IS_ERR(ifp2)) 2068 goto lock_errdad; 2069 2070 spin_lock_bh(&ifp2->lock); 2071 ifp2->stable_privacy_retry = retries; 2072 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2073 spin_unlock_bh(&ifp2->lock); 2074 2075 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2076 in6_ifa_put(ifp2); 2077 lock_errdad: 2078 spin_lock_bh(&ifp->lock); 2079 } 2080 2081 errdad: 2082 /* transition from _POSTDAD to _ERRDAD */ 2083 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2084 spin_unlock_bh(&ifp->lock); 2085 2086 addrconf_mod_dad_work(ifp, 0); 2087 in6_ifa_put(ifp); 2088 } 2089 2090 /* Join to solicited addr multicast group. 2091 * caller must hold RTNL */ 2092 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2093 { 2094 struct in6_addr maddr; 2095 2096 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2097 return; 2098 2099 addrconf_addr_solict_mult(addr, &maddr); 2100 ipv6_dev_mc_inc(dev, &maddr); 2101 } 2102 2103 /* caller must hold RTNL */ 2104 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2105 { 2106 struct in6_addr maddr; 2107 2108 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2109 return; 2110 2111 addrconf_addr_solict_mult(addr, &maddr); 2112 __ipv6_dev_mc_dec(idev, &maddr); 2113 } 2114 2115 /* caller must hold RTNL */ 2116 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2117 { 2118 struct in6_addr addr; 2119 2120 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2121 return; 2122 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2123 if (ipv6_addr_any(&addr)) 2124 return; 2125 __ipv6_dev_ac_inc(ifp->idev, &addr); 2126 } 2127 2128 /* caller must hold RTNL */ 2129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2130 { 2131 struct in6_addr addr; 2132 2133 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2134 return; 2135 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2136 if (ipv6_addr_any(&addr)) 2137 return; 2138 __ipv6_dev_ac_dec(ifp->idev, &addr); 2139 } 2140 2141 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2142 { 2143 switch (dev->addr_len) { 2144 case ETH_ALEN: 2145 memcpy(eui, dev->dev_addr, 3); 2146 eui[3] = 0xFF; 2147 eui[4] = 0xFE; 2148 memcpy(eui + 5, dev->dev_addr + 3, 3); 2149 break; 2150 case EUI64_ADDR_LEN: 2151 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2152 eui[0] ^= 2; 2153 break; 2154 default: 2155 return -1; 2156 } 2157 2158 return 0; 2159 } 2160 2161 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2162 { 2163 union fwnet_hwaddr *ha; 2164 2165 if (dev->addr_len != FWNET_ALEN) 2166 return -1; 2167 2168 ha = (union fwnet_hwaddr *)dev->dev_addr; 2169 2170 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2171 eui[0] ^= 2; 2172 return 0; 2173 } 2174 2175 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2176 { 2177 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2178 if (dev->addr_len != ARCNET_ALEN) 2179 return -1; 2180 memset(eui, 0, 7); 2181 eui[7] = *(u8 *)dev->dev_addr; 2182 return 0; 2183 } 2184 2185 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2186 { 2187 if (dev->addr_len != INFINIBAND_ALEN) 2188 return -1; 2189 memcpy(eui, dev->dev_addr + 12, 8); 2190 eui[0] |= 2; 2191 return 0; 2192 } 2193 2194 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2195 { 2196 if (addr == 0) 2197 return -1; 2198 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2199 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2200 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2201 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2202 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2203 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2204 eui[1] = 0; 2205 eui[2] = 0x5E; 2206 eui[3] = 0xFE; 2207 memcpy(eui + 4, &addr, 4); 2208 return 0; 2209 } 2210 2211 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2212 { 2213 if (dev->priv_flags & IFF_ISATAP) 2214 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2215 return -1; 2216 } 2217 2218 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2219 { 2220 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2221 } 2222 2223 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2224 { 2225 memcpy(eui, dev->perm_addr, 3); 2226 memcpy(eui + 5, dev->perm_addr + 3, 3); 2227 eui[3] = 0xFF; 2228 eui[4] = 0xFE; 2229 eui[0] ^= 2; 2230 return 0; 2231 } 2232 2233 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2234 { 2235 switch (dev->type) { 2236 case ARPHRD_ETHER: 2237 case ARPHRD_FDDI: 2238 return addrconf_ifid_eui48(eui, dev); 2239 case ARPHRD_ARCNET: 2240 return addrconf_ifid_arcnet(eui, dev); 2241 case ARPHRD_INFINIBAND: 2242 return addrconf_ifid_infiniband(eui, dev); 2243 case ARPHRD_SIT: 2244 return addrconf_ifid_sit(eui, dev); 2245 case ARPHRD_IPGRE: 2246 case ARPHRD_TUNNEL: 2247 return addrconf_ifid_gre(eui, dev); 2248 case ARPHRD_6LOWPAN: 2249 return addrconf_ifid_6lowpan(eui, dev); 2250 case ARPHRD_IEEE1394: 2251 return addrconf_ifid_ieee1394(eui, dev); 2252 case ARPHRD_TUNNEL6: 2253 case ARPHRD_IP6GRE: 2254 case ARPHRD_RAWIP: 2255 return addrconf_ifid_ip6tnl(eui, dev); 2256 } 2257 return -1; 2258 } 2259 2260 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2261 { 2262 int err = -1; 2263 struct inet6_ifaddr *ifp; 2264 2265 read_lock_bh(&idev->lock); 2266 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2267 if (ifp->scope > IFA_LINK) 2268 break; 2269 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2270 memcpy(eui, ifp->addr.s6_addr+8, 8); 2271 err = 0; 2272 break; 2273 } 2274 } 2275 read_unlock_bh(&idev->lock); 2276 return err; 2277 } 2278 2279 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2280 static void ipv6_regen_rndid(struct inet6_dev *idev) 2281 { 2282 regen: 2283 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2284 idev->rndid[0] &= ~0x02; 2285 2286 /* 2287 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2288 * check if generated address is not inappropriate 2289 * 2290 * - Reserved subnet anycast (RFC 2526) 2291 * 11111101 11....11 1xxxxxxx 2292 * - ISATAP (RFC4214) 6.1 2293 * 00-00-5E-FE-xx-xx-xx-xx 2294 * - value 0 2295 * - XXX: already assigned to an address on the device 2296 */ 2297 if (idev->rndid[0] == 0xfd && 2298 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2299 (idev->rndid[7]&0x80)) 2300 goto regen; 2301 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2302 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2303 goto regen; 2304 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2305 goto regen; 2306 } 2307 } 2308 2309 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2310 { 2311 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2312 ipv6_regen_rndid(idev); 2313 } 2314 2315 /* 2316 * Add prefix route. 2317 */ 2318 2319 static void 2320 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2321 struct net_device *dev, unsigned long expires, 2322 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 = 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 if (!fib6_info_hold_safe(rt)) 2378 continue; 2379 break; 2380 } 2381 out: 2382 rcu_read_unlock(); 2383 return rt; 2384 } 2385 2386 2387 /* Create "default" multicast route to the interface */ 2388 2389 static void addrconf_add_mroute(struct net_device *dev) 2390 { 2391 struct fib6_config cfg = { 2392 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2393 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2394 .fc_ifindex = dev->ifindex, 2395 .fc_dst_len = 8, 2396 .fc_flags = RTF_UP, 2397 .fc_type = RTN_UNICAST, 2398 .fc_nlinfo.nl_net = dev_net(dev), 2399 }; 2400 2401 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2402 2403 ip6_route_add(&cfg, GFP_ATOMIC, NULL); 2404 } 2405 2406 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2407 { 2408 struct inet6_dev *idev; 2409 2410 ASSERT_RTNL(); 2411 2412 idev = ipv6_find_idev(dev); 2413 if (!idev) 2414 return ERR_PTR(-ENOBUFS); 2415 2416 if (idev->cnf.disable_ipv6) 2417 return ERR_PTR(-EACCES); 2418 2419 /* Add default multicast route */ 2420 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2421 addrconf_add_mroute(dev); 2422 2423 return idev; 2424 } 2425 2426 static void manage_tempaddrs(struct inet6_dev *idev, 2427 struct inet6_ifaddr *ifp, 2428 __u32 valid_lft, __u32 prefered_lft, 2429 bool create, unsigned long now) 2430 { 2431 u32 flags; 2432 struct inet6_ifaddr *ift; 2433 2434 read_lock_bh(&idev->lock); 2435 /* update all temporary addresses in the list */ 2436 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2437 int age, max_valid, max_prefered; 2438 2439 if (ifp != ift->ifpub) 2440 continue; 2441 2442 /* RFC 4941 section 3.3: 2443 * If a received option will extend the lifetime of a public 2444 * address, the lifetimes of temporary addresses should 2445 * be extended, subject to the overall constraint that no 2446 * temporary addresses should ever remain "valid" or "preferred" 2447 * for a time longer than (TEMP_VALID_LIFETIME) or 2448 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2449 */ 2450 age = (now - ift->cstamp) / HZ; 2451 max_valid = idev->cnf.temp_valid_lft - age; 2452 if (max_valid < 0) 2453 max_valid = 0; 2454 2455 max_prefered = idev->cnf.temp_prefered_lft - 2456 idev->desync_factor - age; 2457 if (max_prefered < 0) 2458 max_prefered = 0; 2459 2460 if (valid_lft > max_valid) 2461 valid_lft = max_valid; 2462 2463 if (prefered_lft > max_prefered) 2464 prefered_lft = max_prefered; 2465 2466 spin_lock(&ift->lock); 2467 flags = ift->flags; 2468 ift->valid_lft = valid_lft; 2469 ift->prefered_lft = prefered_lft; 2470 ift->tstamp = now; 2471 if (prefered_lft > 0) 2472 ift->flags &= ~IFA_F_DEPRECATED; 2473 2474 spin_unlock(&ift->lock); 2475 if (!(flags&IFA_F_TENTATIVE)) 2476 ipv6_ifa_notify(0, ift); 2477 } 2478 2479 if ((create || list_empty(&idev->tempaddr_list)) && 2480 idev->cnf.use_tempaddr > 0) { 2481 /* When a new public address is created as described 2482 * in [ADDRCONF], also create a new temporary address. 2483 * Also create a temporary address if it's enabled but 2484 * no temporary address currently exists. 2485 */ 2486 read_unlock_bh(&idev->lock); 2487 ipv6_create_tempaddr(ifp, NULL, false); 2488 } else { 2489 read_unlock_bh(&idev->lock); 2490 } 2491 } 2492 2493 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2494 { 2495 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2496 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2497 } 2498 2499 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2500 const struct prefix_info *pinfo, 2501 struct inet6_dev *in6_dev, 2502 const struct in6_addr *addr, int addr_type, 2503 u32 addr_flags, bool sllao, bool tokenized, 2504 __u32 valid_lft, u32 prefered_lft) 2505 { 2506 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2507 int create = 0, update_lft = 0; 2508 2509 if (!ifp && valid_lft) { 2510 int max_addresses = in6_dev->cnf.max_addresses; 2511 struct ifa6_config cfg = { 2512 .pfx = addr, 2513 .plen = pinfo->prefix_len, 2514 .ifa_flags = addr_flags, 2515 .valid_lft = valid_lft, 2516 .preferred_lft = prefered_lft, 2517 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2518 }; 2519 2520 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2521 if ((net->ipv6.devconf_all->optimistic_dad || 2522 in6_dev->cnf.optimistic_dad) && 2523 !net->ipv6.devconf_all->forwarding && sllao) 2524 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2525 #endif 2526 2527 /* Do not allow to create too much of autoconfigured 2528 * addresses; this would be too easy way to crash kernel. 2529 */ 2530 if (!max_addresses || 2531 ipv6_count_addresses(in6_dev) < max_addresses) 2532 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2533 2534 if (IS_ERR_OR_NULL(ifp)) 2535 return -1; 2536 2537 create = 1; 2538 spin_lock_bh(&ifp->lock); 2539 ifp->flags |= IFA_F_MANAGETEMPADDR; 2540 ifp->cstamp = jiffies; 2541 ifp->tokenized = tokenized; 2542 spin_unlock_bh(&ifp->lock); 2543 addrconf_dad_start(ifp); 2544 } 2545 2546 if (ifp) { 2547 u32 flags; 2548 unsigned long now; 2549 u32 stored_lft; 2550 2551 /* update lifetime (RFC2462 5.5.3 e) */ 2552 spin_lock_bh(&ifp->lock); 2553 now = jiffies; 2554 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2555 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2556 else 2557 stored_lft = 0; 2558 if (!create && stored_lft) { 2559 const u32 minimum_lft = min_t(u32, 2560 stored_lft, MIN_VALID_LIFETIME); 2561 valid_lft = max(valid_lft, minimum_lft); 2562 2563 /* RFC4862 Section 5.5.3e: 2564 * "Note that the preferred lifetime of the 2565 * corresponding address is always reset to 2566 * the Preferred Lifetime in the received 2567 * Prefix Information option, regardless of 2568 * whether the valid lifetime is also reset or 2569 * ignored." 2570 * 2571 * So we should always update prefered_lft here. 2572 */ 2573 update_lft = 1; 2574 } 2575 2576 if (update_lft) { 2577 ifp->valid_lft = valid_lft; 2578 ifp->prefered_lft = prefered_lft; 2579 ifp->tstamp = now; 2580 flags = ifp->flags; 2581 ifp->flags &= ~IFA_F_DEPRECATED; 2582 spin_unlock_bh(&ifp->lock); 2583 2584 if (!(flags&IFA_F_TENTATIVE)) 2585 ipv6_ifa_notify(0, ifp); 2586 } else 2587 spin_unlock_bh(&ifp->lock); 2588 2589 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2590 create, now); 2591 2592 in6_ifa_put(ifp); 2593 addrconf_verify(); 2594 } 2595 2596 return 0; 2597 } 2598 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2599 2600 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2601 { 2602 struct prefix_info *pinfo; 2603 __u32 valid_lft; 2604 __u32 prefered_lft; 2605 int addr_type, err; 2606 u32 addr_flags = 0; 2607 struct inet6_dev *in6_dev; 2608 struct net *net = dev_net(dev); 2609 2610 pinfo = (struct prefix_info *) opt; 2611 2612 if (len < sizeof(struct prefix_info)) { 2613 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2614 return; 2615 } 2616 2617 /* 2618 * Validation checks ([ADDRCONF], page 19) 2619 */ 2620 2621 addr_type = ipv6_addr_type(&pinfo->prefix); 2622 2623 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2624 return; 2625 2626 valid_lft = ntohl(pinfo->valid); 2627 prefered_lft = ntohl(pinfo->prefered); 2628 2629 if (prefered_lft > valid_lft) { 2630 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2631 return; 2632 } 2633 2634 in6_dev = in6_dev_get(dev); 2635 2636 if (!in6_dev) { 2637 net_dbg_ratelimited("addrconf: device %s not configured\n", 2638 dev->name); 2639 return; 2640 } 2641 2642 /* 2643 * Two things going on here: 2644 * 1) Add routes for on-link prefixes 2645 * 2) Configure prefixes with the auto flag set 2646 */ 2647 2648 if (pinfo->onlink) { 2649 struct fib6_info *rt; 2650 unsigned long rt_expires; 2651 2652 /* Avoid arithmetic overflow. Really, we could 2653 * save rt_expires in seconds, likely valid_lft, 2654 * but it would require division in fib gc, that it 2655 * not good. 2656 */ 2657 if (HZ > USER_HZ) 2658 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2659 else 2660 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2661 2662 if (addrconf_finite_timeout(rt_expires)) 2663 rt_expires *= HZ; 2664 2665 rt = addrconf_get_prefix_route(&pinfo->prefix, 2666 pinfo->prefix_len, 2667 dev, 2668 RTF_ADDRCONF | RTF_PREFIX_RT, 2669 RTF_GATEWAY | RTF_DEFAULT); 2670 2671 if (rt) { 2672 /* Autoconf prefix route */ 2673 if (valid_lft == 0) { 2674 ip6_del_rt(net, rt); 2675 rt = NULL; 2676 } else if (addrconf_finite_timeout(rt_expires)) { 2677 /* not infinity */ 2678 fib6_set_expires(rt, jiffies + rt_expires); 2679 } else { 2680 fib6_clean_expires(rt); 2681 } 2682 } else if (valid_lft) { 2683 clock_t expires = 0; 2684 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2685 if (addrconf_finite_timeout(rt_expires)) { 2686 /* not infinity */ 2687 flags |= RTF_EXPIRES; 2688 expires = jiffies_to_clock_t(rt_expires); 2689 } 2690 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2691 0, dev, expires, flags, 2692 GFP_ATOMIC); 2693 } 2694 fib6_info_release(rt); 2695 } 2696 2697 /* Try to figure out our local address for this prefix */ 2698 2699 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2700 struct in6_addr addr; 2701 bool tokenized = false, dev_addr_generated = false; 2702 2703 if (pinfo->prefix_len == 64) { 2704 memcpy(&addr, &pinfo->prefix, 8); 2705 2706 if (!ipv6_addr_any(&in6_dev->token)) { 2707 read_lock_bh(&in6_dev->lock); 2708 memcpy(addr.s6_addr + 8, 2709 in6_dev->token.s6_addr + 8, 8); 2710 read_unlock_bh(&in6_dev->lock); 2711 tokenized = true; 2712 } else if (is_addr_mode_generate_stable(in6_dev) && 2713 !ipv6_generate_stable_address(&addr, 0, 2714 in6_dev)) { 2715 addr_flags |= IFA_F_STABLE_PRIVACY; 2716 goto ok; 2717 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2718 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2719 goto put; 2720 } else { 2721 dev_addr_generated = true; 2722 } 2723 goto ok; 2724 } 2725 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2726 pinfo->prefix_len); 2727 goto put; 2728 2729 ok: 2730 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2731 &addr, addr_type, 2732 addr_flags, sllao, 2733 tokenized, valid_lft, 2734 prefered_lft); 2735 if (err) 2736 goto put; 2737 2738 /* Ignore error case here because previous prefix add addr was 2739 * successful which will be notified. 2740 */ 2741 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2742 addr_type, addr_flags, sllao, 2743 tokenized, valid_lft, 2744 prefered_lft, 2745 dev_addr_generated); 2746 } 2747 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2748 put: 2749 in6_dev_put(in6_dev); 2750 } 2751 2752 /* 2753 * Set destination address. 2754 * Special case for SIT interfaces where we create a new "virtual" 2755 * device. 2756 */ 2757 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2758 { 2759 struct in6_ifreq ireq; 2760 struct net_device *dev; 2761 int err = -EINVAL; 2762 2763 rtnl_lock(); 2764 2765 err = -EFAULT; 2766 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2767 goto err_exit; 2768 2769 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2770 2771 err = -ENODEV; 2772 if (!dev) 2773 goto err_exit; 2774 2775 #if IS_ENABLED(CONFIG_IPV6_SIT) 2776 if (dev->type == ARPHRD_SIT) { 2777 const struct net_device_ops *ops = dev->netdev_ops; 2778 struct ifreq ifr; 2779 struct ip_tunnel_parm p; 2780 2781 err = -EADDRNOTAVAIL; 2782 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2783 goto err_exit; 2784 2785 memset(&p, 0, sizeof(p)); 2786 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2787 p.iph.saddr = 0; 2788 p.iph.version = 4; 2789 p.iph.ihl = 5; 2790 p.iph.protocol = IPPROTO_IPV6; 2791 p.iph.ttl = 64; 2792 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2793 2794 if (ops->ndo_do_ioctl) { 2795 mm_segment_t oldfs = get_fs(); 2796 2797 set_fs(KERNEL_DS); 2798 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2799 set_fs(oldfs); 2800 } else 2801 err = -EOPNOTSUPP; 2802 2803 if (err == 0) { 2804 err = -ENOBUFS; 2805 dev = __dev_get_by_name(net, p.name); 2806 if (!dev) 2807 goto err_exit; 2808 err = dev_open(dev); 2809 } 2810 } 2811 #endif 2812 2813 err_exit: 2814 rtnl_unlock(); 2815 return err; 2816 } 2817 2818 static int ipv6_mc_config(struct sock *sk, bool join, 2819 const struct in6_addr *addr, int ifindex) 2820 { 2821 int ret; 2822 2823 ASSERT_RTNL(); 2824 2825 lock_sock(sk); 2826 if (join) 2827 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2828 else 2829 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2830 release_sock(sk); 2831 2832 return ret; 2833 } 2834 2835 /* 2836 * Manual configuration of address on an interface 2837 */ 2838 static int inet6_addr_add(struct net *net, int ifindex, 2839 struct ifa6_config *cfg, 2840 struct netlink_ext_ack *extack) 2841 { 2842 struct inet6_ifaddr *ifp; 2843 struct inet6_dev *idev; 2844 struct net_device *dev; 2845 unsigned long timeout; 2846 clock_t expires; 2847 u32 flags; 2848 2849 ASSERT_RTNL(); 2850 2851 if (cfg->plen > 128) 2852 return -EINVAL; 2853 2854 /* check the lifetime */ 2855 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2856 return -EINVAL; 2857 2858 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2859 return -EINVAL; 2860 2861 dev = __dev_get_by_index(net, ifindex); 2862 if (!dev) 2863 return -ENODEV; 2864 2865 idev = addrconf_add_dev(dev); 2866 if (IS_ERR(idev)) 2867 return PTR_ERR(idev); 2868 2869 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2870 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2871 true, cfg->pfx, ifindex); 2872 2873 if (ret < 0) 2874 return ret; 2875 } 2876 2877 cfg->scope = ipv6_addr_scope(cfg->pfx); 2878 2879 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2880 if (addrconf_finite_timeout(timeout)) { 2881 expires = jiffies_to_clock_t(timeout * HZ); 2882 cfg->valid_lft = timeout; 2883 flags = RTF_EXPIRES; 2884 } else { 2885 expires = 0; 2886 flags = 0; 2887 cfg->ifa_flags |= IFA_F_PERMANENT; 2888 } 2889 2890 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2891 if (addrconf_finite_timeout(timeout)) { 2892 if (timeout == 0) 2893 cfg->ifa_flags |= IFA_F_DEPRECATED; 2894 cfg->preferred_lft = timeout; 2895 } 2896 2897 ifp = ipv6_add_addr(idev, cfg, true, extack); 2898 if (!IS_ERR(ifp)) { 2899 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2900 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2901 ifp->rt_priority, dev, expires, 2902 flags, GFP_KERNEL); 2903 } 2904 2905 /* Send a netlink notification if DAD is enabled and 2906 * optimistic flag is not set 2907 */ 2908 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2909 ipv6_ifa_notify(0, ifp); 2910 /* 2911 * Note that section 3.1 of RFC 4429 indicates 2912 * that the Optimistic flag should not be set for 2913 * manually configured addresses 2914 */ 2915 addrconf_dad_start(ifp); 2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2917 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2918 cfg->preferred_lft, true, jiffies); 2919 in6_ifa_put(ifp); 2920 addrconf_verify_rtnl(); 2921 return 0; 2922 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2923 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2924 cfg->pfx, ifindex); 2925 } 2926 2927 return PTR_ERR(ifp); 2928 } 2929 2930 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2931 const struct in6_addr *pfx, unsigned int plen) 2932 { 2933 struct inet6_ifaddr *ifp; 2934 struct inet6_dev *idev; 2935 struct net_device *dev; 2936 2937 if (plen > 128) 2938 return -EINVAL; 2939 2940 dev = __dev_get_by_index(net, ifindex); 2941 if (!dev) 2942 return -ENODEV; 2943 2944 idev = __in6_dev_get(dev); 2945 if (!idev) 2946 return -ENXIO; 2947 2948 read_lock_bh(&idev->lock); 2949 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2950 if (ifp->prefix_len == plen && 2951 ipv6_addr_equal(pfx, &ifp->addr)) { 2952 in6_ifa_hold(ifp); 2953 read_unlock_bh(&idev->lock); 2954 2955 if (!(ifp->flags & IFA_F_TEMPORARY) && 2956 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2957 manage_tempaddrs(idev, ifp, 0, 0, false, 2958 jiffies); 2959 ipv6_del_addr(ifp); 2960 addrconf_verify_rtnl(); 2961 if (ipv6_addr_is_multicast(pfx)) { 2962 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2963 false, pfx, dev->ifindex); 2964 } 2965 return 0; 2966 } 2967 } 2968 read_unlock_bh(&idev->lock); 2969 return -EADDRNOTAVAIL; 2970 } 2971 2972 2973 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2974 { 2975 struct ifa6_config cfg = { 2976 .ifa_flags = IFA_F_PERMANENT, 2977 .preferred_lft = INFINITY_LIFE_TIME, 2978 .valid_lft = INFINITY_LIFE_TIME, 2979 }; 2980 struct in6_ifreq ireq; 2981 int err; 2982 2983 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2984 return -EPERM; 2985 2986 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2987 return -EFAULT; 2988 2989 cfg.pfx = &ireq.ifr6_addr; 2990 cfg.plen = ireq.ifr6_prefixlen; 2991 2992 rtnl_lock(); 2993 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 2994 rtnl_unlock(); 2995 return err; 2996 } 2997 2998 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2999 { 3000 struct in6_ifreq ireq; 3001 int err; 3002 3003 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3004 return -EPERM; 3005 3006 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3007 return -EFAULT; 3008 3009 rtnl_lock(); 3010 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3011 ireq.ifr6_prefixlen); 3012 rtnl_unlock(); 3013 return err; 3014 } 3015 3016 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3017 int plen, int scope) 3018 { 3019 struct inet6_ifaddr *ifp; 3020 struct ifa6_config cfg = { 3021 .pfx = addr, 3022 .plen = plen, 3023 .ifa_flags = IFA_F_PERMANENT, 3024 .valid_lft = INFINITY_LIFE_TIME, 3025 .preferred_lft = INFINITY_LIFE_TIME, 3026 .scope = scope 3027 }; 3028 3029 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3030 if (!IS_ERR(ifp)) { 3031 spin_lock_bh(&ifp->lock); 3032 ifp->flags &= ~IFA_F_TENTATIVE; 3033 spin_unlock_bh(&ifp->lock); 3034 rt_genid_bump_ipv6(dev_net(idev->dev)); 3035 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3036 in6_ifa_put(ifp); 3037 } 3038 } 3039 3040 #if IS_ENABLED(CONFIG_IPV6_SIT) 3041 static void sit_add_v4_addrs(struct inet6_dev *idev) 3042 { 3043 struct in6_addr addr; 3044 struct net_device *dev; 3045 struct net *net = dev_net(idev->dev); 3046 int scope, plen; 3047 u32 pflags = 0; 3048 3049 ASSERT_RTNL(); 3050 3051 memset(&addr, 0, sizeof(struct in6_addr)); 3052 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3053 3054 if (idev->dev->flags&IFF_POINTOPOINT) { 3055 addr.s6_addr32[0] = htonl(0xfe800000); 3056 scope = IFA_LINK; 3057 plen = 64; 3058 } else { 3059 scope = IPV6_ADDR_COMPATv4; 3060 plen = 96; 3061 pflags |= RTF_NONEXTHOP; 3062 } 3063 3064 if (addr.s6_addr32[3]) { 3065 add_addr(idev, &addr, plen, scope); 3066 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3067 GFP_ATOMIC); 3068 return; 3069 } 3070 3071 for_each_netdev(net, dev) { 3072 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3073 if (in_dev && (dev->flags & IFF_UP)) { 3074 struct in_ifaddr *ifa; 3075 3076 int flag = scope; 3077 3078 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3079 3080 addr.s6_addr32[3] = ifa->ifa_local; 3081 3082 if (ifa->ifa_scope == RT_SCOPE_LINK) 3083 continue; 3084 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3085 if (idev->dev->flags&IFF_POINTOPOINT) 3086 continue; 3087 flag |= IFA_HOST; 3088 } 3089 3090 add_addr(idev, &addr, plen, flag); 3091 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3092 0, pflags, GFP_ATOMIC); 3093 } 3094 } 3095 } 3096 } 3097 #endif 3098 3099 static void init_loopback(struct net_device *dev) 3100 { 3101 struct inet6_dev *idev; 3102 3103 /* ::1 */ 3104 3105 ASSERT_RTNL(); 3106 3107 idev = ipv6_find_idev(dev); 3108 if (!idev) { 3109 pr_debug("%s: add_dev failed\n", __func__); 3110 return; 3111 } 3112 3113 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3114 } 3115 3116 void addrconf_add_linklocal(struct inet6_dev *idev, 3117 const struct in6_addr *addr, u32 flags) 3118 { 3119 struct ifa6_config cfg = { 3120 .pfx = addr, 3121 .plen = 64, 3122 .ifa_flags = flags | IFA_F_PERMANENT, 3123 .valid_lft = INFINITY_LIFE_TIME, 3124 .preferred_lft = INFINITY_LIFE_TIME, 3125 .scope = IFA_LINK 3126 }; 3127 struct inet6_ifaddr *ifp; 3128 3129 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3130 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3131 idev->cnf.optimistic_dad) && 3132 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3133 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3134 #endif 3135 3136 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3137 if (!IS_ERR(ifp)) { 3138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3139 0, 0, GFP_ATOMIC); 3140 addrconf_dad_start(ifp); 3141 in6_ifa_put(ifp); 3142 } 3143 } 3144 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3145 3146 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3147 { 3148 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3149 return true; 3150 3151 if (address.s6_addr32[2] == htonl(0x02005eff) && 3152 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3153 return true; 3154 3155 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3156 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3157 return true; 3158 3159 return false; 3160 } 3161 3162 static int ipv6_generate_stable_address(struct in6_addr *address, 3163 u8 dad_count, 3164 const struct inet6_dev *idev) 3165 { 3166 static DEFINE_SPINLOCK(lock); 3167 static __u32 digest[SHA_DIGEST_WORDS]; 3168 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3169 3170 static union { 3171 char __data[SHA_MESSAGE_BYTES]; 3172 struct { 3173 struct in6_addr secret; 3174 __be32 prefix[2]; 3175 unsigned char hwaddr[MAX_ADDR_LEN]; 3176 u8 dad_count; 3177 } __packed; 3178 } data; 3179 3180 struct in6_addr secret; 3181 struct in6_addr temp; 3182 struct net *net = dev_net(idev->dev); 3183 3184 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3185 3186 if (idev->cnf.stable_secret.initialized) 3187 secret = idev->cnf.stable_secret.secret; 3188 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3189 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3190 else 3191 return -1; 3192 3193 retry: 3194 spin_lock_bh(&lock); 3195 3196 sha_init(digest); 3197 memset(&data, 0, sizeof(data)); 3198 memset(workspace, 0, sizeof(workspace)); 3199 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3200 data.prefix[0] = address->s6_addr32[0]; 3201 data.prefix[1] = address->s6_addr32[1]; 3202 data.secret = secret; 3203 data.dad_count = dad_count; 3204 3205 sha_transform(digest, data.__data, workspace); 3206 3207 temp = *address; 3208 temp.s6_addr32[2] = (__force __be32)digest[0]; 3209 temp.s6_addr32[3] = (__force __be32)digest[1]; 3210 3211 spin_unlock_bh(&lock); 3212 3213 if (ipv6_reserved_interfaceid(temp)) { 3214 dad_count++; 3215 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3216 return -1; 3217 goto retry; 3218 } 3219 3220 *address = temp; 3221 return 0; 3222 } 3223 3224 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3225 { 3226 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3227 3228 if (s->initialized) 3229 return; 3230 s = &idev->cnf.stable_secret; 3231 get_random_bytes(&s->secret, sizeof(s->secret)); 3232 s->initialized = true; 3233 } 3234 3235 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3236 { 3237 struct in6_addr addr; 3238 3239 /* no link local addresses on L3 master devices */ 3240 if (netif_is_l3_master(idev->dev)) 3241 return; 3242 3243 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3244 3245 switch (idev->cnf.addr_gen_mode) { 3246 case IN6_ADDR_GEN_MODE_RANDOM: 3247 ipv6_gen_mode_random_init(idev); 3248 /* fallthrough */ 3249 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3250 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3251 addrconf_add_linklocal(idev, &addr, 3252 IFA_F_STABLE_PRIVACY); 3253 else if (prefix_route) 3254 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3255 0, 0, GFP_KERNEL); 3256 break; 3257 case IN6_ADDR_GEN_MODE_EUI64: 3258 /* addrconf_add_linklocal also adds a prefix_route and we 3259 * only need to care about prefix routes if ipv6_generate_eui64 3260 * couldn't generate one. 3261 */ 3262 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3263 addrconf_add_linklocal(idev, &addr, 0); 3264 else if (prefix_route) 3265 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3266 0, 0, GFP_KERNEL); 3267 break; 3268 case IN6_ADDR_GEN_MODE_NONE: 3269 default: 3270 /* will not add any link local address */ 3271 break; 3272 } 3273 } 3274 3275 static void addrconf_dev_config(struct net_device *dev) 3276 { 3277 struct inet6_dev *idev; 3278 3279 ASSERT_RTNL(); 3280 3281 if ((dev->type != ARPHRD_ETHER) && 3282 (dev->type != ARPHRD_FDDI) && 3283 (dev->type != ARPHRD_ARCNET) && 3284 (dev->type != ARPHRD_INFINIBAND) && 3285 (dev->type != ARPHRD_IEEE1394) && 3286 (dev->type != ARPHRD_TUNNEL6) && 3287 (dev->type != ARPHRD_6LOWPAN) && 3288 (dev->type != ARPHRD_IP6GRE) && 3289 (dev->type != ARPHRD_IPGRE) && 3290 (dev->type != ARPHRD_TUNNEL) && 3291 (dev->type != ARPHRD_NONE) && 3292 (dev->type != ARPHRD_RAWIP)) { 3293 /* Alas, we support only Ethernet autoconfiguration. */ 3294 return; 3295 } 3296 3297 idev = addrconf_add_dev(dev); 3298 if (IS_ERR(idev)) 3299 return; 3300 3301 /* this device type has no EUI support */ 3302 if (dev->type == ARPHRD_NONE && 3303 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3304 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3305 3306 addrconf_addr_gen(idev, false); 3307 } 3308 3309 #if IS_ENABLED(CONFIG_IPV6_SIT) 3310 static void addrconf_sit_config(struct net_device *dev) 3311 { 3312 struct inet6_dev *idev; 3313 3314 ASSERT_RTNL(); 3315 3316 /* 3317 * Configure the tunnel with one of our IPv4 3318 * addresses... we should configure all of 3319 * our v4 addrs in the tunnel 3320 */ 3321 3322 idev = ipv6_find_idev(dev); 3323 if (!idev) { 3324 pr_debug("%s: add_dev failed\n", __func__); 3325 return; 3326 } 3327 3328 if (dev->priv_flags & IFF_ISATAP) { 3329 addrconf_addr_gen(idev, false); 3330 return; 3331 } 3332 3333 sit_add_v4_addrs(idev); 3334 3335 if (dev->flags&IFF_POINTOPOINT) 3336 addrconf_add_mroute(dev); 3337 } 3338 #endif 3339 3340 #if IS_ENABLED(CONFIG_NET_IPGRE) 3341 static void addrconf_gre_config(struct net_device *dev) 3342 { 3343 struct inet6_dev *idev; 3344 3345 ASSERT_RTNL(); 3346 3347 idev = ipv6_find_idev(dev); 3348 if (!idev) { 3349 pr_debug("%s: add_dev failed\n", __func__); 3350 return; 3351 } 3352 3353 addrconf_addr_gen(idev, true); 3354 if (dev->flags & IFF_POINTOPOINT) 3355 addrconf_add_mroute(dev); 3356 } 3357 #endif 3358 3359 static int fixup_permanent_addr(struct net *net, 3360 struct inet6_dev *idev, 3361 struct inet6_ifaddr *ifp) 3362 { 3363 /* !fib6_node means the host route was removed from the 3364 * FIB, for example, if 'lo' device is taken down. In that 3365 * case regenerate the host route. 3366 */ 3367 if (!ifp->rt || !ifp->rt->fib6_node) { 3368 struct fib6_info *f6i, *prev; 3369 3370 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3371 GFP_ATOMIC); 3372 if (IS_ERR(f6i)) 3373 return PTR_ERR(f6i); 3374 3375 /* ifp->rt can be accessed outside of rtnl */ 3376 spin_lock(&ifp->lock); 3377 prev = ifp->rt; 3378 ifp->rt = f6i; 3379 spin_unlock(&ifp->lock); 3380 3381 fib6_info_release(prev); 3382 } 3383 3384 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3385 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3386 ifp->rt_priority, idev->dev, 0, 0, 3387 GFP_ATOMIC); 3388 } 3389 3390 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3391 addrconf_dad_start(ifp); 3392 3393 return 0; 3394 } 3395 3396 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3397 { 3398 struct inet6_ifaddr *ifp, *tmp; 3399 struct inet6_dev *idev; 3400 3401 idev = __in6_dev_get(dev); 3402 if (!idev) 3403 return; 3404 3405 write_lock_bh(&idev->lock); 3406 3407 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3408 if ((ifp->flags & IFA_F_PERMANENT) && 3409 fixup_permanent_addr(net, idev, ifp) < 0) { 3410 write_unlock_bh(&idev->lock); 3411 in6_ifa_hold(ifp); 3412 ipv6_del_addr(ifp); 3413 write_lock_bh(&idev->lock); 3414 3415 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3416 idev->dev->name, &ifp->addr); 3417 } 3418 } 3419 3420 write_unlock_bh(&idev->lock); 3421 } 3422 3423 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3424 void *ptr) 3425 { 3426 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3427 struct netdev_notifier_changeupper_info *info; 3428 struct inet6_dev *idev = __in6_dev_get(dev); 3429 struct net *net = dev_net(dev); 3430 int run_pending = 0; 3431 int err; 3432 3433 switch (event) { 3434 case NETDEV_REGISTER: 3435 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3436 idev = ipv6_add_dev(dev); 3437 if (IS_ERR(idev)) 3438 return notifier_from_errno(PTR_ERR(idev)); 3439 } 3440 break; 3441 3442 case NETDEV_CHANGEMTU: 3443 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3444 if (dev->mtu < IPV6_MIN_MTU) { 3445 addrconf_ifdown(dev, dev != net->loopback_dev); 3446 break; 3447 } 3448 3449 if (idev) { 3450 rt6_mtu_change(dev, dev->mtu); 3451 idev->cnf.mtu6 = dev->mtu; 3452 break; 3453 } 3454 3455 /* allocate new idev */ 3456 idev = ipv6_add_dev(dev); 3457 if (IS_ERR(idev)) 3458 break; 3459 3460 /* device is still not ready */ 3461 if (!(idev->if_flags & IF_READY)) 3462 break; 3463 3464 run_pending = 1; 3465 3466 /* fall through */ 3467 3468 case NETDEV_UP: 3469 case NETDEV_CHANGE: 3470 if (dev->flags & IFF_SLAVE) 3471 break; 3472 3473 if (idev && idev->cnf.disable_ipv6) 3474 break; 3475 3476 if (event == NETDEV_UP) { 3477 /* restore routes for permanent addresses */ 3478 addrconf_permanent_addr(net, dev); 3479 3480 if (!addrconf_link_ready(dev)) { 3481 /* device is not ready yet. */ 3482 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3483 dev->name); 3484 break; 3485 } 3486 3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3488 idev = ipv6_add_dev(dev); 3489 3490 if (!IS_ERR_OR_NULL(idev)) { 3491 idev->if_flags |= IF_READY; 3492 run_pending = 1; 3493 } 3494 } else if (event == NETDEV_CHANGE) { 3495 if (!addrconf_link_ready(dev)) { 3496 /* device is still not ready. */ 3497 rt6_sync_down_dev(dev, event); 3498 break; 3499 } 3500 3501 if (idev) { 3502 if (idev->if_flags & IF_READY) { 3503 /* device is already configured - 3504 * but resend MLD reports, we might 3505 * have roamed and need to update 3506 * multicast snooping switches 3507 */ 3508 ipv6_mc_up(idev); 3509 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3510 break; 3511 } 3512 idev->if_flags |= IF_READY; 3513 } 3514 3515 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3516 dev->name); 3517 3518 run_pending = 1; 3519 } 3520 3521 switch (dev->type) { 3522 #if IS_ENABLED(CONFIG_IPV6_SIT) 3523 case ARPHRD_SIT: 3524 addrconf_sit_config(dev); 3525 break; 3526 #endif 3527 #if IS_ENABLED(CONFIG_NET_IPGRE) 3528 case ARPHRD_IPGRE: 3529 addrconf_gre_config(dev); 3530 break; 3531 #endif 3532 case ARPHRD_LOOPBACK: 3533 init_loopback(dev); 3534 break; 3535 3536 default: 3537 addrconf_dev_config(dev); 3538 break; 3539 } 3540 3541 if (!IS_ERR_OR_NULL(idev)) { 3542 if (run_pending) 3543 addrconf_dad_run(idev); 3544 3545 /* Device has an address by now */ 3546 rt6_sync_up(dev, RTNH_F_DEAD); 3547 3548 /* 3549 * If the MTU changed during the interface down, 3550 * when the interface up, the changed MTU must be 3551 * reflected in the idev as well as routers. 3552 */ 3553 if (idev->cnf.mtu6 != dev->mtu && 3554 dev->mtu >= IPV6_MIN_MTU) { 3555 rt6_mtu_change(dev, dev->mtu); 3556 idev->cnf.mtu6 = dev->mtu; 3557 } 3558 idev->tstamp = jiffies; 3559 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3560 3561 /* 3562 * If the changed mtu during down is lower than 3563 * IPV6_MIN_MTU stop IPv6 on this interface. 3564 */ 3565 if (dev->mtu < IPV6_MIN_MTU) 3566 addrconf_ifdown(dev, dev != net->loopback_dev); 3567 } 3568 break; 3569 3570 case NETDEV_DOWN: 3571 case NETDEV_UNREGISTER: 3572 /* 3573 * Remove all addresses from this interface. 3574 */ 3575 addrconf_ifdown(dev, event != NETDEV_DOWN); 3576 break; 3577 3578 case NETDEV_CHANGENAME: 3579 if (idev) { 3580 snmp6_unregister_dev(idev); 3581 addrconf_sysctl_unregister(idev); 3582 err = addrconf_sysctl_register(idev); 3583 if (err) 3584 return notifier_from_errno(err); 3585 err = snmp6_register_dev(idev); 3586 if (err) { 3587 addrconf_sysctl_unregister(idev); 3588 return notifier_from_errno(err); 3589 } 3590 } 3591 break; 3592 3593 case NETDEV_PRE_TYPE_CHANGE: 3594 case NETDEV_POST_TYPE_CHANGE: 3595 if (idev) 3596 addrconf_type_change(dev, event); 3597 break; 3598 3599 case NETDEV_CHANGEUPPER: 3600 info = ptr; 3601 3602 /* flush all routes if dev is linked to or unlinked from 3603 * an L3 master device (e.g., VRF) 3604 */ 3605 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3606 addrconf_ifdown(dev, 0); 3607 } 3608 3609 return NOTIFY_OK; 3610 } 3611 3612 /* 3613 * addrconf module should be notified of a device going up 3614 */ 3615 static struct notifier_block ipv6_dev_notf = { 3616 .notifier_call = addrconf_notify, 3617 .priority = ADDRCONF_NOTIFY_PRIORITY, 3618 }; 3619 3620 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3621 { 3622 struct inet6_dev *idev; 3623 ASSERT_RTNL(); 3624 3625 idev = __in6_dev_get(dev); 3626 3627 if (event == NETDEV_POST_TYPE_CHANGE) 3628 ipv6_mc_remap(idev); 3629 else if (event == NETDEV_PRE_TYPE_CHANGE) 3630 ipv6_mc_unmap(idev); 3631 } 3632 3633 static bool addr_is_local(const struct in6_addr *addr) 3634 { 3635 return ipv6_addr_type(addr) & 3636 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3637 } 3638 3639 static int addrconf_ifdown(struct net_device *dev, int how) 3640 { 3641 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3642 struct net *net = dev_net(dev); 3643 struct inet6_dev *idev; 3644 struct inet6_ifaddr *ifa, *tmp; 3645 bool keep_addr = false; 3646 int state, i; 3647 3648 ASSERT_RTNL(); 3649 3650 rt6_disable_ip(dev, event); 3651 3652 idev = __in6_dev_get(dev); 3653 if (!idev) 3654 return -ENODEV; 3655 3656 /* 3657 * Step 1: remove reference to ipv6 device from parent device. 3658 * Do not dev_put! 3659 */ 3660 if (how) { 3661 idev->dead = 1; 3662 3663 /* protected by rtnl_lock */ 3664 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3665 3666 /* Step 1.5: remove snmp6 entry */ 3667 snmp6_unregister_dev(idev); 3668 3669 } 3670 3671 /* combine the user config with event to determine if permanent 3672 * addresses are to be removed from address hash table 3673 */ 3674 if (!how && !idev->cnf.disable_ipv6) { 3675 /* aggregate the system setting and interface setting */ 3676 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3677 3678 if (!_keep_addr) 3679 _keep_addr = idev->cnf.keep_addr_on_down; 3680 3681 keep_addr = (_keep_addr > 0); 3682 } 3683 3684 /* Step 2: clear hash table */ 3685 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3686 struct hlist_head *h = &inet6_addr_lst[i]; 3687 3688 spin_lock_bh(&addrconf_hash_lock); 3689 restart: 3690 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3691 if (ifa->idev == idev) { 3692 addrconf_del_dad_work(ifa); 3693 /* combined flag + permanent flag decide if 3694 * address is retained on a down event 3695 */ 3696 if (!keep_addr || 3697 !(ifa->flags & IFA_F_PERMANENT) || 3698 addr_is_local(&ifa->addr)) { 3699 hlist_del_init_rcu(&ifa->addr_lst); 3700 goto restart; 3701 } 3702 } 3703 } 3704 spin_unlock_bh(&addrconf_hash_lock); 3705 } 3706 3707 write_lock_bh(&idev->lock); 3708 3709 addrconf_del_rs_timer(idev); 3710 3711 /* Step 2: clear flags for stateless addrconf */ 3712 if (!how) 3713 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3714 3715 /* Step 3: clear tempaddr list */ 3716 while (!list_empty(&idev->tempaddr_list)) { 3717 ifa = list_first_entry(&idev->tempaddr_list, 3718 struct inet6_ifaddr, tmp_list); 3719 list_del(&ifa->tmp_list); 3720 write_unlock_bh(&idev->lock); 3721 spin_lock_bh(&ifa->lock); 3722 3723 if (ifa->ifpub) { 3724 in6_ifa_put(ifa->ifpub); 3725 ifa->ifpub = NULL; 3726 } 3727 spin_unlock_bh(&ifa->lock); 3728 in6_ifa_put(ifa); 3729 write_lock_bh(&idev->lock); 3730 } 3731 3732 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3733 struct fib6_info *rt = NULL; 3734 bool keep; 3735 3736 addrconf_del_dad_work(ifa); 3737 3738 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3739 !addr_is_local(&ifa->addr); 3740 3741 write_unlock_bh(&idev->lock); 3742 spin_lock_bh(&ifa->lock); 3743 3744 if (keep) { 3745 /* set state to skip the notifier below */ 3746 state = INET6_IFADDR_STATE_DEAD; 3747 ifa->state = INET6_IFADDR_STATE_PREDAD; 3748 if (!(ifa->flags & IFA_F_NODAD)) 3749 ifa->flags |= IFA_F_TENTATIVE; 3750 3751 rt = ifa->rt; 3752 ifa->rt = NULL; 3753 } else { 3754 state = ifa->state; 3755 ifa->state = INET6_IFADDR_STATE_DEAD; 3756 } 3757 3758 spin_unlock_bh(&ifa->lock); 3759 3760 if (rt) 3761 ip6_del_rt(net, rt); 3762 3763 if (state != INET6_IFADDR_STATE_DEAD) { 3764 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3765 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3766 } else { 3767 if (idev->cnf.forwarding) 3768 addrconf_leave_anycast(ifa); 3769 addrconf_leave_solict(ifa->idev, &ifa->addr); 3770 } 3771 3772 write_lock_bh(&idev->lock); 3773 if (!keep) { 3774 list_del_rcu(&ifa->if_list); 3775 in6_ifa_put(ifa); 3776 } 3777 } 3778 3779 write_unlock_bh(&idev->lock); 3780 3781 /* Step 5: Discard anycast and multicast list */ 3782 if (how) { 3783 ipv6_ac_destroy_dev(idev); 3784 ipv6_mc_destroy_dev(idev); 3785 } else { 3786 ipv6_mc_down(idev); 3787 } 3788 3789 idev->tstamp = jiffies; 3790 3791 /* Last: Shot the device (if unregistered) */ 3792 if (how) { 3793 addrconf_sysctl_unregister(idev); 3794 neigh_parms_release(&nd_tbl, idev->nd_parms); 3795 neigh_ifdown(&nd_tbl, dev); 3796 in6_dev_put(idev); 3797 } 3798 return 0; 3799 } 3800 3801 static void addrconf_rs_timer(struct timer_list *t) 3802 { 3803 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3804 struct net_device *dev = idev->dev; 3805 struct in6_addr lladdr; 3806 3807 write_lock(&idev->lock); 3808 if (idev->dead || !(idev->if_flags & IF_READY)) 3809 goto out; 3810 3811 if (!ipv6_accept_ra(idev)) 3812 goto out; 3813 3814 /* Announcement received after solicitation was sent */ 3815 if (idev->if_flags & IF_RA_RCVD) 3816 goto out; 3817 3818 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3819 write_unlock(&idev->lock); 3820 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3821 ndisc_send_rs(dev, &lladdr, 3822 &in6addr_linklocal_allrouters); 3823 else 3824 goto put; 3825 3826 write_lock(&idev->lock); 3827 idev->rs_interval = rfc3315_s14_backoff_update( 3828 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3829 /* The wait after the last probe can be shorter */ 3830 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3831 idev->cnf.rtr_solicits) ? 3832 idev->cnf.rtr_solicit_delay : 3833 idev->rs_interval); 3834 } else { 3835 /* 3836 * Note: we do not support deprecated "all on-link" 3837 * assumption any longer. 3838 */ 3839 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3840 } 3841 3842 out: 3843 write_unlock(&idev->lock); 3844 put: 3845 in6_dev_put(idev); 3846 } 3847 3848 /* 3849 * Duplicate Address Detection 3850 */ 3851 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3852 { 3853 unsigned long rand_num; 3854 struct inet6_dev *idev = ifp->idev; 3855 u64 nonce; 3856 3857 if (ifp->flags & IFA_F_OPTIMISTIC) 3858 rand_num = 0; 3859 else 3860 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3861 3862 nonce = 0; 3863 if (idev->cnf.enhanced_dad || 3864 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3865 do 3866 get_random_bytes(&nonce, 6); 3867 while (nonce == 0); 3868 } 3869 ifp->dad_nonce = nonce; 3870 ifp->dad_probes = idev->cnf.dad_transmits; 3871 addrconf_mod_dad_work(ifp, rand_num); 3872 } 3873 3874 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3875 { 3876 struct inet6_dev *idev = ifp->idev; 3877 struct net_device *dev = idev->dev; 3878 bool bump_id, notify = false; 3879 struct net *net; 3880 3881 addrconf_join_solict(dev, &ifp->addr); 3882 3883 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3884 3885 read_lock_bh(&idev->lock); 3886 spin_lock(&ifp->lock); 3887 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3888 goto out; 3889 3890 net = dev_net(dev); 3891 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3892 (net->ipv6.devconf_all->accept_dad < 1 && 3893 idev->cnf.accept_dad < 1) || 3894 !(ifp->flags&IFA_F_TENTATIVE) || 3895 ifp->flags & IFA_F_NODAD) { 3896 bool send_na = false; 3897 3898 if (ifp->flags & IFA_F_TENTATIVE && 3899 !(ifp->flags & IFA_F_OPTIMISTIC)) 3900 send_na = true; 3901 bump_id = ifp->flags & IFA_F_TENTATIVE; 3902 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3903 spin_unlock(&ifp->lock); 3904 read_unlock_bh(&idev->lock); 3905 3906 addrconf_dad_completed(ifp, bump_id, send_na); 3907 return; 3908 } 3909 3910 if (!(idev->if_flags & IF_READY)) { 3911 spin_unlock(&ifp->lock); 3912 read_unlock_bh(&idev->lock); 3913 /* 3914 * If the device is not ready: 3915 * - keep it tentative if it is a permanent address. 3916 * - otherwise, kill it. 3917 */ 3918 in6_ifa_hold(ifp); 3919 addrconf_dad_stop(ifp, 0); 3920 return; 3921 } 3922 3923 /* 3924 * Optimistic nodes can start receiving 3925 * Frames right away 3926 */ 3927 if (ifp->flags & IFA_F_OPTIMISTIC) { 3928 ip6_ins_rt(net, ifp->rt); 3929 if (ipv6_use_optimistic_addr(net, idev)) { 3930 /* Because optimistic nodes can use this address, 3931 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3932 */ 3933 notify = true; 3934 } 3935 } 3936 3937 addrconf_dad_kick(ifp); 3938 out: 3939 spin_unlock(&ifp->lock); 3940 read_unlock_bh(&idev->lock); 3941 if (notify) 3942 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3943 } 3944 3945 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3946 { 3947 bool begin_dad = false; 3948 3949 spin_lock_bh(&ifp->lock); 3950 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3951 ifp->state = INET6_IFADDR_STATE_PREDAD; 3952 begin_dad = true; 3953 } 3954 spin_unlock_bh(&ifp->lock); 3955 3956 if (begin_dad) 3957 addrconf_mod_dad_work(ifp, 0); 3958 } 3959 3960 static void addrconf_dad_work(struct work_struct *w) 3961 { 3962 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3963 struct inet6_ifaddr, 3964 dad_work); 3965 struct inet6_dev *idev = ifp->idev; 3966 bool bump_id, disable_ipv6 = false; 3967 struct in6_addr mcaddr; 3968 3969 enum { 3970 DAD_PROCESS, 3971 DAD_BEGIN, 3972 DAD_ABORT, 3973 } action = DAD_PROCESS; 3974 3975 rtnl_lock(); 3976 3977 spin_lock_bh(&ifp->lock); 3978 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3979 action = DAD_BEGIN; 3980 ifp->state = INET6_IFADDR_STATE_DAD; 3981 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3982 action = DAD_ABORT; 3983 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3984 3985 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3986 idev->cnf.accept_dad > 1) && 3987 !idev->cnf.disable_ipv6 && 3988 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3989 struct in6_addr addr; 3990 3991 addr.s6_addr32[0] = htonl(0xfe800000); 3992 addr.s6_addr32[1] = 0; 3993 3994 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3995 ipv6_addr_equal(&ifp->addr, &addr)) { 3996 /* DAD failed for link-local based on MAC */ 3997 idev->cnf.disable_ipv6 = 1; 3998 3999 pr_info("%s: IPv6 being disabled!\n", 4000 ifp->idev->dev->name); 4001 disable_ipv6 = true; 4002 } 4003 } 4004 } 4005 spin_unlock_bh(&ifp->lock); 4006 4007 if (action == DAD_BEGIN) { 4008 addrconf_dad_begin(ifp); 4009 goto out; 4010 } else if (action == DAD_ABORT) { 4011 in6_ifa_hold(ifp); 4012 addrconf_dad_stop(ifp, 1); 4013 if (disable_ipv6) 4014 addrconf_ifdown(idev->dev, 0); 4015 goto out; 4016 } 4017 4018 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4019 goto out; 4020 4021 write_lock_bh(&idev->lock); 4022 if (idev->dead || !(idev->if_flags & IF_READY)) { 4023 write_unlock_bh(&idev->lock); 4024 goto out; 4025 } 4026 4027 spin_lock(&ifp->lock); 4028 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4029 spin_unlock(&ifp->lock); 4030 write_unlock_bh(&idev->lock); 4031 goto out; 4032 } 4033 4034 if (ifp->dad_probes == 0) { 4035 bool send_na = false; 4036 4037 /* 4038 * DAD was successful 4039 */ 4040 4041 if (ifp->flags & IFA_F_TENTATIVE && 4042 !(ifp->flags & IFA_F_OPTIMISTIC)) 4043 send_na = true; 4044 bump_id = ifp->flags & IFA_F_TENTATIVE; 4045 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4046 spin_unlock(&ifp->lock); 4047 write_unlock_bh(&idev->lock); 4048 4049 addrconf_dad_completed(ifp, bump_id, send_na); 4050 4051 goto out; 4052 } 4053 4054 ifp->dad_probes--; 4055 addrconf_mod_dad_work(ifp, 4056 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4057 spin_unlock(&ifp->lock); 4058 write_unlock_bh(&idev->lock); 4059 4060 /* send a neighbour solicitation for our addr */ 4061 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4062 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4063 ifp->dad_nonce); 4064 out: 4065 in6_ifa_put(ifp); 4066 rtnl_unlock(); 4067 } 4068 4069 /* ifp->idev must be at least read locked */ 4070 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4071 { 4072 struct inet6_ifaddr *ifpiter; 4073 struct inet6_dev *idev = ifp->idev; 4074 4075 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4076 if (ifpiter->scope > IFA_LINK) 4077 break; 4078 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4079 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4080 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4081 IFA_F_PERMANENT) 4082 return false; 4083 } 4084 return true; 4085 } 4086 4087 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4088 bool send_na) 4089 { 4090 struct net_device *dev = ifp->idev->dev; 4091 struct in6_addr lladdr; 4092 bool send_rs, send_mld; 4093 4094 addrconf_del_dad_work(ifp); 4095 4096 /* 4097 * Configure the address for reception. Now it is valid. 4098 */ 4099 4100 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4101 4102 /* If added prefix is link local and we are prepared to process 4103 router advertisements, start sending router solicitations. 4104 */ 4105 4106 read_lock_bh(&ifp->idev->lock); 4107 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4108 send_rs = send_mld && 4109 ipv6_accept_ra(ifp->idev) && 4110 ifp->idev->cnf.rtr_solicits != 0 && 4111 (dev->flags&IFF_LOOPBACK) == 0; 4112 read_unlock_bh(&ifp->idev->lock); 4113 4114 /* While dad is in progress mld report's source address is in6_addrany. 4115 * Resend with proper ll now. 4116 */ 4117 if (send_mld) 4118 ipv6_mc_dad_complete(ifp->idev); 4119 4120 /* send unsolicited NA if enabled */ 4121 if (send_na && 4122 (ifp->idev->cnf.ndisc_notify || 4123 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4124 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4125 /*router=*/ !!ifp->idev->cnf.forwarding, 4126 /*solicited=*/ false, /*override=*/ true, 4127 /*inc_opt=*/ true); 4128 } 4129 4130 if (send_rs) { 4131 /* 4132 * If a host as already performed a random delay 4133 * [...] as part of DAD [...] there is no need 4134 * to delay again before sending the first RS 4135 */ 4136 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4137 return; 4138 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4139 4140 write_lock_bh(&ifp->idev->lock); 4141 spin_lock(&ifp->lock); 4142 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4143 ifp->idev->cnf.rtr_solicit_interval); 4144 ifp->idev->rs_probes = 1; 4145 ifp->idev->if_flags |= IF_RS_SENT; 4146 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4147 spin_unlock(&ifp->lock); 4148 write_unlock_bh(&ifp->idev->lock); 4149 } 4150 4151 if (bump_id) 4152 rt_genid_bump_ipv6(dev_net(dev)); 4153 4154 /* Make sure that a new temporary address will be created 4155 * before this temporary address becomes deprecated. 4156 */ 4157 if (ifp->flags & IFA_F_TEMPORARY) 4158 addrconf_verify_rtnl(); 4159 } 4160 4161 static void addrconf_dad_run(struct inet6_dev *idev) 4162 { 4163 struct inet6_ifaddr *ifp; 4164 4165 read_lock_bh(&idev->lock); 4166 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4167 spin_lock(&ifp->lock); 4168 if (ifp->flags & IFA_F_TENTATIVE && 4169 ifp->state == INET6_IFADDR_STATE_DAD) 4170 addrconf_dad_kick(ifp); 4171 spin_unlock(&ifp->lock); 4172 } 4173 read_unlock_bh(&idev->lock); 4174 } 4175 4176 #ifdef CONFIG_PROC_FS 4177 struct if6_iter_state { 4178 struct seq_net_private p; 4179 int bucket; 4180 int offset; 4181 }; 4182 4183 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4184 { 4185 struct if6_iter_state *state = seq->private; 4186 struct net *net = seq_file_net(seq); 4187 struct inet6_ifaddr *ifa = NULL; 4188 int p = 0; 4189 4190 /* initial bucket if pos is 0 */ 4191 if (pos == 0) { 4192 state->bucket = 0; 4193 state->offset = 0; 4194 } 4195 4196 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4197 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4198 addr_lst) { 4199 if (!net_eq(dev_net(ifa->idev->dev), net)) 4200 continue; 4201 /* sync with offset */ 4202 if (p < state->offset) { 4203 p++; 4204 continue; 4205 } 4206 state->offset++; 4207 return ifa; 4208 } 4209 4210 /* prepare for next bucket */ 4211 state->offset = 0; 4212 p = 0; 4213 } 4214 return NULL; 4215 } 4216 4217 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4218 struct inet6_ifaddr *ifa) 4219 { 4220 struct if6_iter_state *state = seq->private; 4221 struct net *net = seq_file_net(seq); 4222 4223 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4224 if (!net_eq(dev_net(ifa->idev->dev), net)) 4225 continue; 4226 state->offset++; 4227 return ifa; 4228 } 4229 4230 while (++state->bucket < IN6_ADDR_HSIZE) { 4231 state->offset = 0; 4232 hlist_for_each_entry_rcu(ifa, 4233 &inet6_addr_lst[state->bucket], addr_lst) { 4234 if (!net_eq(dev_net(ifa->idev->dev), net)) 4235 continue; 4236 state->offset++; 4237 return ifa; 4238 } 4239 } 4240 4241 return NULL; 4242 } 4243 4244 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4245 __acquires(rcu) 4246 { 4247 rcu_read_lock(); 4248 return if6_get_first(seq, *pos); 4249 } 4250 4251 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4252 { 4253 struct inet6_ifaddr *ifa; 4254 4255 ifa = if6_get_next(seq, v); 4256 ++*pos; 4257 return ifa; 4258 } 4259 4260 static void if6_seq_stop(struct seq_file *seq, void *v) 4261 __releases(rcu) 4262 { 4263 rcu_read_unlock(); 4264 } 4265 4266 static int if6_seq_show(struct seq_file *seq, void *v) 4267 { 4268 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4269 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4270 &ifp->addr, 4271 ifp->idev->dev->ifindex, 4272 ifp->prefix_len, 4273 ifp->scope, 4274 (u8) ifp->flags, 4275 ifp->idev->dev->name); 4276 return 0; 4277 } 4278 4279 static const struct seq_operations if6_seq_ops = { 4280 .start = if6_seq_start, 4281 .next = if6_seq_next, 4282 .show = if6_seq_show, 4283 .stop = if6_seq_stop, 4284 }; 4285 4286 static int __net_init if6_proc_net_init(struct net *net) 4287 { 4288 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4289 sizeof(struct if6_iter_state))) 4290 return -ENOMEM; 4291 return 0; 4292 } 4293 4294 static void __net_exit if6_proc_net_exit(struct net *net) 4295 { 4296 remove_proc_entry("if_inet6", net->proc_net); 4297 } 4298 4299 static struct pernet_operations if6_proc_net_ops = { 4300 .init = if6_proc_net_init, 4301 .exit = if6_proc_net_exit, 4302 }; 4303 4304 int __init if6_proc_init(void) 4305 { 4306 return register_pernet_subsys(&if6_proc_net_ops); 4307 } 4308 4309 void if6_proc_exit(void) 4310 { 4311 unregister_pernet_subsys(&if6_proc_net_ops); 4312 } 4313 #endif /* CONFIG_PROC_FS */ 4314 4315 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4316 /* Check if address is a home address configured on any interface. */ 4317 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4318 { 4319 unsigned int hash = inet6_addr_hash(net, addr); 4320 struct inet6_ifaddr *ifp = NULL; 4321 int ret = 0; 4322 4323 rcu_read_lock(); 4324 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4325 if (!net_eq(dev_net(ifp->idev->dev), net)) 4326 continue; 4327 if (ipv6_addr_equal(&ifp->addr, addr) && 4328 (ifp->flags & IFA_F_HOMEADDRESS)) { 4329 ret = 1; 4330 break; 4331 } 4332 } 4333 rcu_read_unlock(); 4334 return ret; 4335 } 4336 #endif 4337 4338 /* 4339 * Periodic address status verification 4340 */ 4341 4342 static void addrconf_verify_rtnl(void) 4343 { 4344 unsigned long now, next, next_sec, next_sched; 4345 struct inet6_ifaddr *ifp; 4346 int i; 4347 4348 ASSERT_RTNL(); 4349 4350 rcu_read_lock_bh(); 4351 now = jiffies; 4352 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4353 4354 cancel_delayed_work(&addr_chk_work); 4355 4356 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4357 restart: 4358 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4359 unsigned long age; 4360 4361 /* When setting preferred_lft to a value not zero or 4362 * infinity, while valid_lft is infinity 4363 * IFA_F_PERMANENT has a non-infinity life time. 4364 */ 4365 if ((ifp->flags & IFA_F_PERMANENT) && 4366 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4367 continue; 4368 4369 spin_lock(&ifp->lock); 4370 /* We try to batch several events at once. */ 4371 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4372 4373 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4374 age >= ifp->valid_lft) { 4375 spin_unlock(&ifp->lock); 4376 in6_ifa_hold(ifp); 4377 ipv6_del_addr(ifp); 4378 goto restart; 4379 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4380 spin_unlock(&ifp->lock); 4381 continue; 4382 } else if (age >= ifp->prefered_lft) { 4383 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4384 int deprecate = 0; 4385 4386 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4387 deprecate = 1; 4388 ifp->flags |= IFA_F_DEPRECATED; 4389 } 4390 4391 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4392 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4393 next = ifp->tstamp + ifp->valid_lft * HZ; 4394 4395 spin_unlock(&ifp->lock); 4396 4397 if (deprecate) { 4398 in6_ifa_hold(ifp); 4399 4400 ipv6_ifa_notify(0, ifp); 4401 in6_ifa_put(ifp); 4402 goto restart; 4403 } 4404 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4405 !(ifp->flags&IFA_F_TENTATIVE)) { 4406 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4407 ifp->idev->cnf.dad_transmits * 4408 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4409 4410 if (age >= ifp->prefered_lft - regen_advance) { 4411 struct inet6_ifaddr *ifpub = ifp->ifpub; 4412 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4413 next = ifp->tstamp + ifp->prefered_lft * HZ; 4414 if (!ifp->regen_count && ifpub) { 4415 ifp->regen_count++; 4416 in6_ifa_hold(ifp); 4417 in6_ifa_hold(ifpub); 4418 spin_unlock(&ifp->lock); 4419 4420 spin_lock(&ifpub->lock); 4421 ifpub->regen_count = 0; 4422 spin_unlock(&ifpub->lock); 4423 rcu_read_unlock_bh(); 4424 ipv6_create_tempaddr(ifpub, ifp, true); 4425 in6_ifa_put(ifpub); 4426 in6_ifa_put(ifp); 4427 rcu_read_lock_bh(); 4428 goto restart; 4429 } 4430 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4431 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4432 spin_unlock(&ifp->lock); 4433 } else { 4434 /* ifp->prefered_lft <= ifp->valid_lft */ 4435 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4436 next = ifp->tstamp + ifp->prefered_lft * HZ; 4437 spin_unlock(&ifp->lock); 4438 } 4439 } 4440 } 4441 4442 next_sec = round_jiffies_up(next); 4443 next_sched = next; 4444 4445 /* If rounded timeout is accurate enough, accept it. */ 4446 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4447 next_sched = next_sec; 4448 4449 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4450 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4451 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4452 4453 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4454 now, next, next_sec, next_sched); 4455 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4456 rcu_read_unlock_bh(); 4457 } 4458 4459 static void addrconf_verify_work(struct work_struct *w) 4460 { 4461 rtnl_lock(); 4462 addrconf_verify_rtnl(); 4463 rtnl_unlock(); 4464 } 4465 4466 static void addrconf_verify(void) 4467 { 4468 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4469 } 4470 4471 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4472 struct in6_addr **peer_pfx) 4473 { 4474 struct in6_addr *pfx = NULL; 4475 4476 *peer_pfx = NULL; 4477 4478 if (addr) 4479 pfx = nla_data(addr); 4480 4481 if (local) { 4482 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4483 *peer_pfx = pfx; 4484 pfx = nla_data(local); 4485 } 4486 4487 return pfx; 4488 } 4489 4490 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4491 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4492 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4493 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4494 [IFA_FLAGS] = { .len = sizeof(u32) }, 4495 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4496 }; 4497 4498 static int 4499 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4500 struct netlink_ext_ack *extack) 4501 { 4502 struct net *net = sock_net(skb->sk); 4503 struct ifaddrmsg *ifm; 4504 struct nlattr *tb[IFA_MAX+1]; 4505 struct in6_addr *pfx, *peer_pfx; 4506 u32 ifa_flags; 4507 int err; 4508 4509 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4510 extack); 4511 if (err < 0) 4512 return err; 4513 4514 ifm = nlmsg_data(nlh); 4515 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4516 if (!pfx) 4517 return -EINVAL; 4518 4519 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4520 4521 /* We ignore other flags so far. */ 4522 ifa_flags &= IFA_F_MANAGETEMPADDR; 4523 4524 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4525 ifm->ifa_prefixlen); 4526 } 4527 4528 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4529 unsigned long expires, u32 flags) 4530 { 4531 struct fib6_info *f6i; 4532 u32 prio; 4533 4534 f6i = addrconf_get_prefix_route(&ifp->addr, 4535 ifp->prefix_len, 4536 ifp->idev->dev, 4537 0, RTF_GATEWAY | RTF_DEFAULT); 4538 if (!f6i) 4539 return -ENOENT; 4540 4541 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4542 if (f6i->fib6_metric != prio) { 4543 /* delete old one */ 4544 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4545 4546 /* add new one */ 4547 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4548 ifp->rt_priority, ifp->idev->dev, 4549 expires, flags, GFP_KERNEL); 4550 } else { 4551 if (!expires) 4552 fib6_clean_expires(f6i); 4553 else 4554 fib6_set_expires(f6i, expires); 4555 4556 fib6_info_release(f6i); 4557 } 4558 4559 return 0; 4560 } 4561 4562 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4563 { 4564 u32 flags; 4565 clock_t expires; 4566 unsigned long timeout; 4567 bool was_managetempaddr; 4568 bool had_prefixroute; 4569 4570 ASSERT_RTNL(); 4571 4572 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4573 return -EINVAL; 4574 4575 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4576 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4577 return -EINVAL; 4578 4579 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4580 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4581 4582 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4583 if (addrconf_finite_timeout(timeout)) { 4584 expires = jiffies_to_clock_t(timeout * HZ); 4585 cfg->valid_lft = timeout; 4586 flags = RTF_EXPIRES; 4587 } else { 4588 expires = 0; 4589 flags = 0; 4590 cfg->ifa_flags |= IFA_F_PERMANENT; 4591 } 4592 4593 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4594 if (addrconf_finite_timeout(timeout)) { 4595 if (timeout == 0) 4596 cfg->ifa_flags |= IFA_F_DEPRECATED; 4597 cfg->preferred_lft = timeout; 4598 } 4599 4600 spin_lock_bh(&ifp->lock); 4601 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4602 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4603 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4604 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4605 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4606 IFA_F_NOPREFIXROUTE); 4607 ifp->flags |= cfg->ifa_flags; 4608 ifp->tstamp = jiffies; 4609 ifp->valid_lft = cfg->valid_lft; 4610 ifp->prefered_lft = cfg->preferred_lft; 4611 4612 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4613 ifp->rt_priority = cfg->rt_priority; 4614 4615 spin_unlock_bh(&ifp->lock); 4616 if (!(ifp->flags&IFA_F_TENTATIVE)) 4617 ipv6_ifa_notify(0, ifp); 4618 4619 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4620 int rc = -ENOENT; 4621 4622 if (had_prefixroute) 4623 rc = modify_prefix_route(ifp, expires, flags); 4624 4625 /* prefix route could have been deleted; if so restore it */ 4626 if (rc == -ENOENT) { 4627 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4628 ifp->rt_priority, ifp->idev->dev, 4629 expires, flags, GFP_KERNEL); 4630 } 4631 } else if (had_prefixroute) { 4632 enum cleanup_prefix_rt_t action; 4633 unsigned long rt_expires; 4634 4635 write_lock_bh(&ifp->idev->lock); 4636 action = check_cleanup_prefix_route(ifp, &rt_expires); 4637 write_unlock_bh(&ifp->idev->lock); 4638 4639 if (action != CLEANUP_PREFIX_RT_NOP) { 4640 cleanup_prefix_route(ifp, rt_expires, 4641 action == CLEANUP_PREFIX_RT_DEL); 4642 } 4643 } 4644 4645 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4646 if (was_managetempaddr && 4647 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4648 cfg->valid_lft = 0; 4649 cfg->preferred_lft = 0; 4650 } 4651 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4652 cfg->preferred_lft, !was_managetempaddr, 4653 jiffies); 4654 } 4655 4656 addrconf_verify_rtnl(); 4657 4658 return 0; 4659 } 4660 4661 static int 4662 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4663 struct netlink_ext_ack *extack) 4664 { 4665 struct net *net = sock_net(skb->sk); 4666 struct ifaddrmsg *ifm; 4667 struct nlattr *tb[IFA_MAX+1]; 4668 struct in6_addr *peer_pfx; 4669 struct inet6_ifaddr *ifa; 4670 struct net_device *dev; 4671 struct inet6_dev *idev; 4672 struct ifa6_config cfg; 4673 int err; 4674 4675 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4676 extack); 4677 if (err < 0) 4678 return err; 4679 4680 memset(&cfg, 0, sizeof(cfg)); 4681 4682 ifm = nlmsg_data(nlh); 4683 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4684 if (!cfg.pfx) 4685 return -EINVAL; 4686 4687 cfg.peer_pfx = peer_pfx; 4688 cfg.plen = ifm->ifa_prefixlen; 4689 if (tb[IFA_RT_PRIORITY]) 4690 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4691 4692 cfg.valid_lft = INFINITY_LIFE_TIME; 4693 cfg.preferred_lft = INFINITY_LIFE_TIME; 4694 4695 if (tb[IFA_CACHEINFO]) { 4696 struct ifa_cacheinfo *ci; 4697 4698 ci = nla_data(tb[IFA_CACHEINFO]); 4699 cfg.valid_lft = ci->ifa_valid; 4700 cfg.preferred_lft = ci->ifa_prefered; 4701 } 4702 4703 dev = __dev_get_by_index(net, ifm->ifa_index); 4704 if (!dev) 4705 return -ENODEV; 4706 4707 if (tb[IFA_FLAGS]) 4708 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4709 else 4710 cfg.ifa_flags = ifm->ifa_flags; 4711 4712 /* We ignore other flags so far. */ 4713 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4714 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4715 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4716 4717 idev = ipv6_find_idev(dev); 4718 if (IS_ERR(idev)) 4719 return PTR_ERR(idev); 4720 4721 if (!ipv6_allow_optimistic_dad(net, idev)) 4722 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4723 4724 if (cfg.ifa_flags & IFA_F_NODAD && 4725 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4726 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4727 return -EINVAL; 4728 } 4729 4730 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4731 if (!ifa) { 4732 /* 4733 * It would be best to check for !NLM_F_CREATE here but 4734 * userspace already relies on not having to provide this. 4735 */ 4736 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4737 } 4738 4739 if (nlh->nlmsg_flags & NLM_F_EXCL || 4740 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4741 err = -EEXIST; 4742 else 4743 err = inet6_addr_modify(ifa, &cfg); 4744 4745 in6_ifa_put(ifa); 4746 4747 return err; 4748 } 4749 4750 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4751 u8 scope, int ifindex) 4752 { 4753 struct ifaddrmsg *ifm; 4754 4755 ifm = nlmsg_data(nlh); 4756 ifm->ifa_family = AF_INET6; 4757 ifm->ifa_prefixlen = prefixlen; 4758 ifm->ifa_flags = flags; 4759 ifm->ifa_scope = scope; 4760 ifm->ifa_index = ifindex; 4761 } 4762 4763 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4764 unsigned long tstamp, u32 preferred, u32 valid) 4765 { 4766 struct ifa_cacheinfo ci; 4767 4768 ci.cstamp = cstamp_delta(cstamp); 4769 ci.tstamp = cstamp_delta(tstamp); 4770 ci.ifa_prefered = preferred; 4771 ci.ifa_valid = valid; 4772 4773 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4774 } 4775 4776 static inline int rt_scope(int ifa_scope) 4777 { 4778 if (ifa_scope & IFA_HOST) 4779 return RT_SCOPE_HOST; 4780 else if (ifa_scope & IFA_LINK) 4781 return RT_SCOPE_LINK; 4782 else if (ifa_scope & IFA_SITE) 4783 return RT_SCOPE_SITE; 4784 else 4785 return RT_SCOPE_UNIVERSE; 4786 } 4787 4788 static inline int inet6_ifaddr_msgsize(void) 4789 { 4790 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4791 + nla_total_size(16) /* IFA_LOCAL */ 4792 + nla_total_size(16) /* IFA_ADDRESS */ 4793 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4794 + nla_total_size(4) /* IFA_FLAGS */ 4795 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4796 } 4797 4798 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4799 u32 portid, u32 seq, int event, unsigned int flags) 4800 { 4801 struct nlmsghdr *nlh; 4802 u32 preferred, valid; 4803 4804 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4805 if (!nlh) 4806 return -EMSGSIZE; 4807 4808 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4809 ifa->idev->dev->ifindex); 4810 4811 if (!((ifa->flags&IFA_F_PERMANENT) && 4812 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4813 preferred = ifa->prefered_lft; 4814 valid = ifa->valid_lft; 4815 if (preferred != INFINITY_LIFE_TIME) { 4816 long tval = (jiffies - ifa->tstamp)/HZ; 4817 if (preferred > tval) 4818 preferred -= tval; 4819 else 4820 preferred = 0; 4821 if (valid != INFINITY_LIFE_TIME) { 4822 if (valid > tval) 4823 valid -= tval; 4824 else 4825 valid = 0; 4826 } 4827 } 4828 } else { 4829 preferred = INFINITY_LIFE_TIME; 4830 valid = INFINITY_LIFE_TIME; 4831 } 4832 4833 if (!ipv6_addr_any(&ifa->peer_addr)) { 4834 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4835 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4836 goto error; 4837 } else 4838 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4839 goto error; 4840 4841 if (ifa->rt_priority && 4842 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4843 goto error; 4844 4845 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4846 goto error; 4847 4848 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4849 goto error; 4850 4851 nlmsg_end(skb, nlh); 4852 return 0; 4853 4854 error: 4855 nlmsg_cancel(skb, nlh); 4856 return -EMSGSIZE; 4857 } 4858 4859 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4860 u32 portid, u32 seq, int event, u16 flags) 4861 { 4862 struct nlmsghdr *nlh; 4863 u8 scope = RT_SCOPE_UNIVERSE; 4864 int ifindex = ifmca->idev->dev->ifindex; 4865 4866 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4867 scope = RT_SCOPE_SITE; 4868 4869 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4870 if (!nlh) 4871 return -EMSGSIZE; 4872 4873 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4874 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4875 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4876 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4877 nlmsg_cancel(skb, nlh); 4878 return -EMSGSIZE; 4879 } 4880 4881 nlmsg_end(skb, nlh); 4882 return 0; 4883 } 4884 4885 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4886 u32 portid, u32 seq, int event, unsigned int flags) 4887 { 4888 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4889 int ifindex = dev ? dev->ifindex : 1; 4890 struct nlmsghdr *nlh; 4891 u8 scope = RT_SCOPE_UNIVERSE; 4892 4893 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4894 scope = RT_SCOPE_SITE; 4895 4896 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4897 if (!nlh) 4898 return -EMSGSIZE; 4899 4900 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4901 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4902 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4903 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4904 nlmsg_cancel(skb, nlh); 4905 return -EMSGSIZE; 4906 } 4907 4908 nlmsg_end(skb, nlh); 4909 return 0; 4910 } 4911 4912 enum addr_type_t { 4913 UNICAST_ADDR, 4914 MULTICAST_ADDR, 4915 ANYCAST_ADDR, 4916 }; 4917 4918 /* called with rcu_read_lock() */ 4919 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4920 struct netlink_callback *cb, enum addr_type_t type, 4921 int s_ip_idx, int *p_ip_idx) 4922 { 4923 struct ifmcaddr6 *ifmca; 4924 struct ifacaddr6 *ifaca; 4925 int err = 1; 4926 int ip_idx = *p_ip_idx; 4927 4928 read_lock_bh(&idev->lock); 4929 switch (type) { 4930 case UNICAST_ADDR: { 4931 struct inet6_ifaddr *ifa; 4932 4933 /* unicast address incl. temp addr */ 4934 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4935 if (++ip_idx < s_ip_idx) 4936 continue; 4937 err = inet6_fill_ifaddr(skb, ifa, 4938 NETLINK_CB(cb->skb).portid, 4939 cb->nlh->nlmsg_seq, 4940 RTM_NEWADDR, 4941 NLM_F_MULTI); 4942 if (err < 0) 4943 break; 4944 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4945 } 4946 break; 4947 } 4948 case MULTICAST_ADDR: 4949 /* multicast address */ 4950 for (ifmca = idev->mc_list; ifmca; 4951 ifmca = ifmca->next, ip_idx++) { 4952 if (ip_idx < s_ip_idx) 4953 continue; 4954 err = inet6_fill_ifmcaddr(skb, ifmca, 4955 NETLINK_CB(cb->skb).portid, 4956 cb->nlh->nlmsg_seq, 4957 RTM_GETMULTICAST, 4958 NLM_F_MULTI); 4959 if (err < 0) 4960 break; 4961 } 4962 break; 4963 case ANYCAST_ADDR: 4964 /* anycast address */ 4965 for (ifaca = idev->ac_list; ifaca; 4966 ifaca = ifaca->aca_next, ip_idx++) { 4967 if (ip_idx < s_ip_idx) 4968 continue; 4969 err = inet6_fill_ifacaddr(skb, ifaca, 4970 NETLINK_CB(cb->skb).portid, 4971 cb->nlh->nlmsg_seq, 4972 RTM_GETANYCAST, 4973 NLM_F_MULTI); 4974 if (err < 0) 4975 break; 4976 } 4977 break; 4978 default: 4979 break; 4980 } 4981 read_unlock_bh(&idev->lock); 4982 *p_ip_idx = ip_idx; 4983 return err; 4984 } 4985 4986 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4987 enum addr_type_t type) 4988 { 4989 struct net *net = sock_net(skb->sk); 4990 int h, s_h; 4991 int idx, ip_idx; 4992 int s_idx, s_ip_idx; 4993 struct net_device *dev; 4994 struct inet6_dev *idev; 4995 struct hlist_head *head; 4996 4997 s_h = cb->args[0]; 4998 s_idx = idx = cb->args[1]; 4999 s_ip_idx = ip_idx = cb->args[2]; 5000 5001 rcu_read_lock(); 5002 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 5003 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5004 idx = 0; 5005 head = &net->dev_index_head[h]; 5006 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5007 if (idx < s_idx) 5008 goto cont; 5009 if (h > s_h || idx > s_idx) 5010 s_ip_idx = 0; 5011 ip_idx = 0; 5012 idev = __in6_dev_get(dev); 5013 if (!idev) 5014 goto cont; 5015 5016 if (in6_dump_addrs(idev, skb, cb, type, 5017 s_ip_idx, &ip_idx) < 0) 5018 goto done; 5019 cont: 5020 idx++; 5021 } 5022 } 5023 done: 5024 rcu_read_unlock(); 5025 cb->args[0] = h; 5026 cb->args[1] = idx; 5027 cb->args[2] = ip_idx; 5028 5029 return skb->len; 5030 } 5031 5032 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5033 { 5034 enum addr_type_t type = UNICAST_ADDR; 5035 5036 return inet6_dump_addr(skb, cb, type); 5037 } 5038 5039 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5040 { 5041 enum addr_type_t type = MULTICAST_ADDR; 5042 5043 return inet6_dump_addr(skb, cb, type); 5044 } 5045 5046 5047 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5048 { 5049 enum addr_type_t type = ANYCAST_ADDR; 5050 5051 return inet6_dump_addr(skb, cb, type); 5052 } 5053 5054 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5055 struct netlink_ext_ack *extack) 5056 { 5057 struct net *net = sock_net(in_skb->sk); 5058 struct ifaddrmsg *ifm; 5059 struct nlattr *tb[IFA_MAX+1]; 5060 struct in6_addr *addr = NULL, *peer; 5061 struct net_device *dev = NULL; 5062 struct inet6_ifaddr *ifa; 5063 struct sk_buff *skb; 5064 int err; 5065 5066 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5067 extack); 5068 if (err < 0) 5069 return err; 5070 5071 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5072 if (!addr) 5073 return -EINVAL; 5074 5075 ifm = nlmsg_data(nlh); 5076 if (ifm->ifa_index) 5077 dev = dev_get_by_index(net, ifm->ifa_index); 5078 5079 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5080 if (!ifa) { 5081 err = -EADDRNOTAVAIL; 5082 goto errout; 5083 } 5084 5085 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5086 if (!skb) { 5087 err = -ENOBUFS; 5088 goto errout_ifa; 5089 } 5090 5091 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5092 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5093 if (err < 0) { 5094 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5095 WARN_ON(err == -EMSGSIZE); 5096 kfree_skb(skb); 5097 goto errout_ifa; 5098 } 5099 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5100 errout_ifa: 5101 in6_ifa_put(ifa); 5102 errout: 5103 if (dev) 5104 dev_put(dev); 5105 return err; 5106 } 5107 5108 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5109 { 5110 struct sk_buff *skb; 5111 struct net *net = dev_net(ifa->idev->dev); 5112 int err = -ENOBUFS; 5113 5114 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5115 if (!skb) 5116 goto errout; 5117 5118 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5119 if (err < 0) { 5120 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5121 WARN_ON(err == -EMSGSIZE); 5122 kfree_skb(skb); 5123 goto errout; 5124 } 5125 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5126 return; 5127 errout: 5128 if (err < 0) 5129 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5130 } 5131 5132 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5133 __s32 *array, int bytes) 5134 { 5135 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5136 5137 memset(array, 0, bytes); 5138 array[DEVCONF_FORWARDING] = cnf->forwarding; 5139 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5140 array[DEVCONF_MTU6] = cnf->mtu6; 5141 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5142 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5143 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5144 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5145 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5146 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5147 jiffies_to_msecs(cnf->rtr_solicit_interval); 5148 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5149 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5150 array[DEVCONF_RTR_SOLICIT_DELAY] = 5151 jiffies_to_msecs(cnf->rtr_solicit_delay); 5152 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5153 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5154 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5155 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5156 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5157 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5158 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5159 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5160 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5161 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5162 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5163 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5164 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5165 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5166 #ifdef CONFIG_IPV6_ROUTER_PREF 5167 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5168 array[DEVCONF_RTR_PROBE_INTERVAL] = 5169 jiffies_to_msecs(cnf->rtr_probe_interval); 5170 #ifdef CONFIG_IPV6_ROUTE_INFO 5171 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5172 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5173 #endif 5174 #endif 5175 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5176 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5177 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5178 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5179 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5180 #endif 5181 #ifdef CONFIG_IPV6_MROUTE 5182 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5183 #endif 5184 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5185 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5186 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5187 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5188 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5189 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5190 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5191 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5192 /* we omit DEVCONF_STABLE_SECRET for now */ 5193 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5194 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5195 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5196 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5197 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5198 #ifdef CONFIG_IPV6_SEG6_HMAC 5199 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5200 #endif 5201 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5202 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5203 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5204 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5205 } 5206 5207 static inline size_t inet6_ifla6_size(void) 5208 { 5209 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5210 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5211 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5212 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5213 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5214 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5215 } 5216 5217 static inline size_t inet6_if_nlmsg_size(void) 5218 { 5219 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5220 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5221 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5222 + nla_total_size(4) /* IFLA_MTU */ 5223 + nla_total_size(4) /* IFLA_LINK */ 5224 + nla_total_size(1) /* IFLA_OPERSTATE */ 5225 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5226 } 5227 5228 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5229 int bytes) 5230 { 5231 int i; 5232 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5233 BUG_ON(pad < 0); 5234 5235 /* Use put_unaligned() because stats may not be aligned for u64. */ 5236 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5237 for (i = 1; i < ICMP6_MIB_MAX; i++) 5238 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5239 5240 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5241 } 5242 5243 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5244 int bytes, size_t syncpoff) 5245 { 5246 int i, c; 5247 u64 buff[IPSTATS_MIB_MAX]; 5248 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5249 5250 BUG_ON(pad < 0); 5251 5252 memset(buff, 0, sizeof(buff)); 5253 buff[0] = IPSTATS_MIB_MAX; 5254 5255 for_each_possible_cpu(c) { 5256 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5257 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5258 } 5259 5260 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5261 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5262 } 5263 5264 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5265 int bytes) 5266 { 5267 switch (attrtype) { 5268 case IFLA_INET6_STATS: 5269 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5270 offsetof(struct ipstats_mib, syncp)); 5271 break; 5272 case IFLA_INET6_ICMP6STATS: 5273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5274 break; 5275 } 5276 } 5277 5278 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5279 u32 ext_filter_mask) 5280 { 5281 struct nlattr *nla; 5282 struct ifla_cacheinfo ci; 5283 5284 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5285 goto nla_put_failure; 5286 ci.max_reasm_len = IPV6_MAXPLEN; 5287 ci.tstamp = cstamp_delta(idev->tstamp); 5288 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5289 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5290 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5291 goto nla_put_failure; 5292 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5293 if (!nla) 5294 goto nla_put_failure; 5295 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5296 5297 /* XXX - MC not implemented */ 5298 5299 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5300 return 0; 5301 5302 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5303 if (!nla) 5304 goto nla_put_failure; 5305 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5306 5307 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5308 if (!nla) 5309 goto nla_put_failure; 5310 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5311 5312 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5313 if (!nla) 5314 goto nla_put_failure; 5315 5316 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5317 goto nla_put_failure; 5318 5319 read_lock_bh(&idev->lock); 5320 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5321 read_unlock_bh(&idev->lock); 5322 5323 return 0; 5324 5325 nla_put_failure: 5326 return -EMSGSIZE; 5327 } 5328 5329 static size_t inet6_get_link_af_size(const struct net_device *dev, 5330 u32 ext_filter_mask) 5331 { 5332 if (!__in6_dev_get(dev)) 5333 return 0; 5334 5335 return inet6_ifla6_size(); 5336 } 5337 5338 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5339 u32 ext_filter_mask) 5340 { 5341 struct inet6_dev *idev = __in6_dev_get(dev); 5342 5343 if (!idev) 5344 return -ENODATA; 5345 5346 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5347 return -EMSGSIZE; 5348 5349 return 0; 5350 } 5351 5352 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5353 { 5354 struct inet6_ifaddr *ifp; 5355 struct net_device *dev = idev->dev; 5356 bool clear_token, update_rs = false; 5357 struct in6_addr ll_addr; 5358 5359 ASSERT_RTNL(); 5360 5361 if (!token) 5362 return -EINVAL; 5363 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5364 return -EINVAL; 5365 if (!ipv6_accept_ra(idev)) 5366 return -EINVAL; 5367 if (idev->cnf.rtr_solicits == 0) 5368 return -EINVAL; 5369 5370 write_lock_bh(&idev->lock); 5371 5372 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5373 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5374 5375 write_unlock_bh(&idev->lock); 5376 5377 clear_token = ipv6_addr_any(token); 5378 if (clear_token) 5379 goto update_lft; 5380 5381 if (!idev->dead && (idev->if_flags & IF_READY) && 5382 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5383 IFA_F_OPTIMISTIC)) { 5384 /* If we're not ready, then normal ifup will take care 5385 * of this. Otherwise, we need to request our rs here. 5386 */ 5387 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5388 update_rs = true; 5389 } 5390 5391 update_lft: 5392 write_lock_bh(&idev->lock); 5393 5394 if (update_rs) { 5395 idev->if_flags |= IF_RS_SENT; 5396 idev->rs_interval = rfc3315_s14_backoff_init( 5397 idev->cnf.rtr_solicit_interval); 5398 idev->rs_probes = 1; 5399 addrconf_mod_rs_timer(idev, idev->rs_interval); 5400 } 5401 5402 /* Well, that's kinda nasty ... */ 5403 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5404 spin_lock(&ifp->lock); 5405 if (ifp->tokenized) { 5406 ifp->valid_lft = 0; 5407 ifp->prefered_lft = 0; 5408 } 5409 spin_unlock(&ifp->lock); 5410 } 5411 5412 write_unlock_bh(&idev->lock); 5413 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5414 addrconf_verify_rtnl(); 5415 return 0; 5416 } 5417 5418 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5419 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5420 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5421 }; 5422 5423 static int inet6_validate_link_af(const struct net_device *dev, 5424 const struct nlattr *nla) 5425 { 5426 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5427 5428 if (dev && !__in6_dev_get(dev)) 5429 return -EAFNOSUPPORT; 5430 5431 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5432 NULL); 5433 } 5434 5435 static int check_addr_gen_mode(int mode) 5436 { 5437 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5438 mode != IN6_ADDR_GEN_MODE_NONE && 5439 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5440 mode != IN6_ADDR_GEN_MODE_RANDOM) 5441 return -EINVAL; 5442 return 1; 5443 } 5444 5445 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5446 int mode) 5447 { 5448 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5449 !idev->cnf.stable_secret.initialized && 5450 !net->ipv6.devconf_dflt->stable_secret.initialized) 5451 return -EINVAL; 5452 return 1; 5453 } 5454 5455 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5456 { 5457 int err = -EINVAL; 5458 struct inet6_dev *idev = __in6_dev_get(dev); 5459 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5460 5461 if (!idev) 5462 return -EAFNOSUPPORT; 5463 5464 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5465 BUG(); 5466 5467 if (tb[IFLA_INET6_TOKEN]) { 5468 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5469 if (err) 5470 return err; 5471 } 5472 5473 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5474 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5475 5476 if (check_addr_gen_mode(mode) < 0 || 5477 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5478 return -EINVAL; 5479 5480 idev->cnf.addr_gen_mode = mode; 5481 err = 0; 5482 } 5483 5484 return err; 5485 } 5486 5487 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5488 u32 portid, u32 seq, int event, unsigned int flags) 5489 { 5490 struct net_device *dev = idev->dev; 5491 struct ifinfomsg *hdr; 5492 struct nlmsghdr *nlh; 5493 void *protoinfo; 5494 5495 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5496 if (!nlh) 5497 return -EMSGSIZE; 5498 5499 hdr = nlmsg_data(nlh); 5500 hdr->ifi_family = AF_INET6; 5501 hdr->__ifi_pad = 0; 5502 hdr->ifi_type = dev->type; 5503 hdr->ifi_index = dev->ifindex; 5504 hdr->ifi_flags = dev_get_flags(dev); 5505 hdr->ifi_change = 0; 5506 5507 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5508 (dev->addr_len && 5509 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5510 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5511 (dev->ifindex != dev_get_iflink(dev) && 5512 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5513 nla_put_u8(skb, IFLA_OPERSTATE, 5514 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5515 goto nla_put_failure; 5516 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5517 if (!protoinfo) 5518 goto nla_put_failure; 5519 5520 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5521 goto nla_put_failure; 5522 5523 nla_nest_end(skb, protoinfo); 5524 nlmsg_end(skb, nlh); 5525 return 0; 5526 5527 nla_put_failure: 5528 nlmsg_cancel(skb, nlh); 5529 return -EMSGSIZE; 5530 } 5531 5532 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5533 { 5534 struct net *net = sock_net(skb->sk); 5535 int h, s_h; 5536 int idx = 0, s_idx; 5537 struct net_device *dev; 5538 struct inet6_dev *idev; 5539 struct hlist_head *head; 5540 5541 s_h = cb->args[0]; 5542 s_idx = cb->args[1]; 5543 5544 rcu_read_lock(); 5545 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5546 idx = 0; 5547 head = &net->dev_index_head[h]; 5548 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5549 if (idx < s_idx) 5550 goto cont; 5551 idev = __in6_dev_get(dev); 5552 if (!idev) 5553 goto cont; 5554 if (inet6_fill_ifinfo(skb, idev, 5555 NETLINK_CB(cb->skb).portid, 5556 cb->nlh->nlmsg_seq, 5557 RTM_NEWLINK, NLM_F_MULTI) < 0) 5558 goto out; 5559 cont: 5560 idx++; 5561 } 5562 } 5563 out: 5564 rcu_read_unlock(); 5565 cb->args[1] = idx; 5566 cb->args[0] = h; 5567 5568 return skb->len; 5569 } 5570 5571 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5572 { 5573 struct sk_buff *skb; 5574 struct net *net = dev_net(idev->dev); 5575 int err = -ENOBUFS; 5576 5577 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5578 if (!skb) 5579 goto errout; 5580 5581 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5582 if (err < 0) { 5583 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5584 WARN_ON(err == -EMSGSIZE); 5585 kfree_skb(skb); 5586 goto errout; 5587 } 5588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5589 return; 5590 errout: 5591 if (err < 0) 5592 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5593 } 5594 5595 static inline size_t inet6_prefix_nlmsg_size(void) 5596 { 5597 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5598 + nla_total_size(sizeof(struct in6_addr)) 5599 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5600 } 5601 5602 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5603 struct prefix_info *pinfo, u32 portid, u32 seq, 5604 int event, unsigned int flags) 5605 { 5606 struct prefixmsg *pmsg; 5607 struct nlmsghdr *nlh; 5608 struct prefix_cacheinfo ci; 5609 5610 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5611 if (!nlh) 5612 return -EMSGSIZE; 5613 5614 pmsg = nlmsg_data(nlh); 5615 pmsg->prefix_family = AF_INET6; 5616 pmsg->prefix_pad1 = 0; 5617 pmsg->prefix_pad2 = 0; 5618 pmsg->prefix_ifindex = idev->dev->ifindex; 5619 pmsg->prefix_len = pinfo->prefix_len; 5620 pmsg->prefix_type = pinfo->type; 5621 pmsg->prefix_pad3 = 0; 5622 pmsg->prefix_flags = 0; 5623 if (pinfo->onlink) 5624 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5625 if (pinfo->autoconf) 5626 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5627 5628 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5629 goto nla_put_failure; 5630 ci.preferred_time = ntohl(pinfo->prefered); 5631 ci.valid_time = ntohl(pinfo->valid); 5632 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5633 goto nla_put_failure; 5634 nlmsg_end(skb, nlh); 5635 return 0; 5636 5637 nla_put_failure: 5638 nlmsg_cancel(skb, nlh); 5639 return -EMSGSIZE; 5640 } 5641 5642 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5643 struct prefix_info *pinfo) 5644 { 5645 struct sk_buff *skb; 5646 struct net *net = dev_net(idev->dev); 5647 int err = -ENOBUFS; 5648 5649 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5650 if (!skb) 5651 goto errout; 5652 5653 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5654 if (err < 0) { 5655 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5656 WARN_ON(err == -EMSGSIZE); 5657 kfree_skb(skb); 5658 goto errout; 5659 } 5660 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5661 return; 5662 errout: 5663 if (err < 0) 5664 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5665 } 5666 5667 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5668 { 5669 struct net *net = dev_net(ifp->idev->dev); 5670 5671 if (event) 5672 ASSERT_RTNL(); 5673 5674 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5675 5676 switch (event) { 5677 case RTM_NEWADDR: 5678 /* 5679 * If the address was optimistic 5680 * we inserted the route at the start of 5681 * our DAD process, so we don't need 5682 * to do it again 5683 */ 5684 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5685 ip6_ins_rt(net, ifp->rt); 5686 if (ifp->idev->cnf.forwarding) 5687 addrconf_join_anycast(ifp); 5688 if (!ipv6_addr_any(&ifp->peer_addr)) 5689 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5690 ifp->idev->dev, 0, 0, 5691 GFP_ATOMIC); 5692 break; 5693 case RTM_DELADDR: 5694 if (ifp->idev->cnf.forwarding) 5695 addrconf_leave_anycast(ifp); 5696 addrconf_leave_solict(ifp->idev, &ifp->addr); 5697 if (!ipv6_addr_any(&ifp->peer_addr)) { 5698 struct fib6_info *rt; 5699 5700 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5701 ifp->idev->dev, 0, 0); 5702 if (rt) 5703 ip6_del_rt(net, rt); 5704 } 5705 if (ifp->rt) { 5706 ip6_del_rt(net, ifp->rt); 5707 ifp->rt = NULL; 5708 } 5709 rt_genid_bump_ipv6(net); 5710 break; 5711 } 5712 atomic_inc(&net->ipv6.dev_addr_genid); 5713 } 5714 5715 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5716 { 5717 rcu_read_lock_bh(); 5718 if (likely(ifp->idev->dead == 0)) 5719 __ipv6_ifa_notify(event, ifp); 5720 rcu_read_unlock_bh(); 5721 } 5722 5723 #ifdef CONFIG_SYSCTL 5724 5725 static 5726 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5727 void __user *buffer, size_t *lenp, loff_t *ppos) 5728 { 5729 int *valp = ctl->data; 5730 int val = *valp; 5731 loff_t pos = *ppos; 5732 struct ctl_table lctl; 5733 int ret; 5734 5735 /* 5736 * ctl->data points to idev->cnf.forwarding, we should 5737 * not modify it until we get the rtnl lock. 5738 */ 5739 lctl = *ctl; 5740 lctl.data = &val; 5741 5742 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5743 5744 if (write) 5745 ret = addrconf_fixup_forwarding(ctl, valp, val); 5746 if (ret) 5747 *ppos = pos; 5748 return ret; 5749 } 5750 5751 static 5752 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5753 void __user *buffer, size_t *lenp, loff_t *ppos) 5754 { 5755 struct inet6_dev *idev = ctl->extra1; 5756 int min_mtu = IPV6_MIN_MTU; 5757 struct ctl_table lctl; 5758 5759 lctl = *ctl; 5760 lctl.extra1 = &min_mtu; 5761 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5762 5763 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5764 } 5765 5766 static void dev_disable_change(struct inet6_dev *idev) 5767 { 5768 struct netdev_notifier_info info; 5769 5770 if (!idev || !idev->dev) 5771 return; 5772 5773 netdev_notifier_info_init(&info, idev->dev); 5774 if (idev->cnf.disable_ipv6) 5775 addrconf_notify(NULL, NETDEV_DOWN, &info); 5776 else 5777 addrconf_notify(NULL, NETDEV_UP, &info); 5778 } 5779 5780 static void addrconf_disable_change(struct net *net, __s32 newf) 5781 { 5782 struct net_device *dev; 5783 struct inet6_dev *idev; 5784 5785 for_each_netdev(net, dev) { 5786 idev = __in6_dev_get(dev); 5787 if (idev) { 5788 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5789 idev->cnf.disable_ipv6 = newf; 5790 if (changed) 5791 dev_disable_change(idev); 5792 } 5793 } 5794 } 5795 5796 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5797 { 5798 struct net *net; 5799 int old; 5800 5801 if (!rtnl_trylock()) 5802 return restart_syscall(); 5803 5804 net = (struct net *)table->extra2; 5805 old = *p; 5806 *p = newf; 5807 5808 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5809 rtnl_unlock(); 5810 return 0; 5811 } 5812 5813 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5814 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5815 addrconf_disable_change(net, newf); 5816 } else if ((!newf) ^ (!old)) 5817 dev_disable_change((struct inet6_dev *)table->extra1); 5818 5819 rtnl_unlock(); 5820 return 0; 5821 } 5822 5823 static 5824 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5825 void __user *buffer, size_t *lenp, loff_t *ppos) 5826 { 5827 int *valp = ctl->data; 5828 int val = *valp; 5829 loff_t pos = *ppos; 5830 struct ctl_table lctl; 5831 int ret; 5832 5833 /* 5834 * ctl->data points to idev->cnf.disable_ipv6, we should 5835 * not modify it until we get the rtnl lock. 5836 */ 5837 lctl = *ctl; 5838 lctl.data = &val; 5839 5840 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5841 5842 if (write) 5843 ret = addrconf_disable_ipv6(ctl, valp, val); 5844 if (ret) 5845 *ppos = pos; 5846 return ret; 5847 } 5848 5849 static 5850 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5851 void __user *buffer, size_t *lenp, loff_t *ppos) 5852 { 5853 int *valp = ctl->data; 5854 int ret; 5855 int old, new; 5856 5857 old = *valp; 5858 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5859 new = *valp; 5860 5861 if (write && old != new) { 5862 struct net *net = ctl->extra2; 5863 5864 if (!rtnl_trylock()) 5865 return restart_syscall(); 5866 5867 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5869 NETCONFA_PROXY_NEIGH, 5870 NETCONFA_IFINDEX_DEFAULT, 5871 net->ipv6.devconf_dflt); 5872 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5874 NETCONFA_PROXY_NEIGH, 5875 NETCONFA_IFINDEX_ALL, 5876 net->ipv6.devconf_all); 5877 else { 5878 struct inet6_dev *idev = ctl->extra1; 5879 5880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5881 NETCONFA_PROXY_NEIGH, 5882 idev->dev->ifindex, 5883 &idev->cnf); 5884 } 5885 rtnl_unlock(); 5886 } 5887 5888 return ret; 5889 } 5890 5891 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5892 void __user *buffer, size_t *lenp, 5893 loff_t *ppos) 5894 { 5895 int ret = 0; 5896 int new_val; 5897 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5898 struct net *net = (struct net *)ctl->extra2; 5899 5900 if (!rtnl_trylock()) 5901 return restart_syscall(); 5902 5903 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5904 5905 if (write) { 5906 new_val = *((int *)ctl->data); 5907 5908 if (check_addr_gen_mode(new_val) < 0) { 5909 ret = -EINVAL; 5910 goto out; 5911 } 5912 5913 /* request for default */ 5914 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5915 ipv6_devconf_dflt.addr_gen_mode = new_val; 5916 5917 /* request for individual net device */ 5918 } else { 5919 if (!idev) 5920 goto out; 5921 5922 if (check_stable_privacy(idev, net, new_val) < 0) { 5923 ret = -EINVAL; 5924 goto out; 5925 } 5926 5927 if (idev->cnf.addr_gen_mode != new_val) { 5928 idev->cnf.addr_gen_mode = new_val; 5929 addrconf_dev_config(idev->dev); 5930 } 5931 } 5932 } 5933 5934 out: 5935 rtnl_unlock(); 5936 5937 return ret; 5938 } 5939 5940 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5941 void __user *buffer, size_t *lenp, 5942 loff_t *ppos) 5943 { 5944 int err; 5945 struct in6_addr addr; 5946 char str[IPV6_MAX_STRLEN]; 5947 struct ctl_table lctl = *ctl; 5948 struct net *net = ctl->extra2; 5949 struct ipv6_stable_secret *secret = ctl->data; 5950 5951 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5952 return -EIO; 5953 5954 lctl.maxlen = IPV6_MAX_STRLEN; 5955 lctl.data = str; 5956 5957 if (!rtnl_trylock()) 5958 return restart_syscall(); 5959 5960 if (!write && !secret->initialized) { 5961 err = -EIO; 5962 goto out; 5963 } 5964 5965 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5966 if (err >= sizeof(str)) { 5967 err = -EIO; 5968 goto out; 5969 } 5970 5971 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5972 if (err || !write) 5973 goto out; 5974 5975 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5976 err = -EIO; 5977 goto out; 5978 } 5979 5980 secret->initialized = true; 5981 secret->secret = addr; 5982 5983 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5984 struct net_device *dev; 5985 5986 for_each_netdev(net, dev) { 5987 struct inet6_dev *idev = __in6_dev_get(dev); 5988 5989 if (idev) { 5990 idev->cnf.addr_gen_mode = 5991 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5992 } 5993 } 5994 } else { 5995 struct inet6_dev *idev = ctl->extra1; 5996 5997 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5998 } 5999 6000 out: 6001 rtnl_unlock(); 6002 6003 return err; 6004 } 6005 6006 static 6007 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6008 int write, 6009 void __user *buffer, 6010 size_t *lenp, 6011 loff_t *ppos) 6012 { 6013 int *valp = ctl->data; 6014 int val = *valp; 6015 loff_t pos = *ppos; 6016 struct ctl_table lctl; 6017 int ret; 6018 6019 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6020 * we should not modify it until we get the rtnl lock. 6021 */ 6022 lctl = *ctl; 6023 lctl.data = &val; 6024 6025 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6026 6027 if (write) 6028 ret = addrconf_fixup_linkdown(ctl, valp, val); 6029 if (ret) 6030 *ppos = pos; 6031 return ret; 6032 } 6033 6034 static 6035 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6036 { 6037 if (rt) { 6038 if (action) 6039 rt->dst.flags |= DST_NOPOLICY; 6040 else 6041 rt->dst.flags &= ~DST_NOPOLICY; 6042 } 6043 } 6044 6045 static 6046 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6047 { 6048 struct inet6_ifaddr *ifa; 6049 6050 read_lock_bh(&idev->lock); 6051 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6052 spin_lock(&ifa->lock); 6053 if (ifa->rt) { 6054 struct fib6_info *rt = ifa->rt; 6055 int cpu; 6056 6057 rcu_read_lock(); 6058 ifa->rt->dst_nopolicy = val ? true : false; 6059 if (rt->rt6i_pcpu) { 6060 for_each_possible_cpu(cpu) { 6061 struct rt6_info **rtp; 6062 6063 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6064 addrconf_set_nopolicy(*rtp, val); 6065 } 6066 } 6067 rcu_read_unlock(); 6068 } 6069 spin_unlock(&ifa->lock); 6070 } 6071 read_unlock_bh(&idev->lock); 6072 } 6073 6074 static 6075 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6076 { 6077 struct inet6_dev *idev; 6078 struct net *net; 6079 6080 if (!rtnl_trylock()) 6081 return restart_syscall(); 6082 6083 *valp = val; 6084 6085 net = (struct net *)ctl->extra2; 6086 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6087 rtnl_unlock(); 6088 return 0; 6089 } 6090 6091 if (valp == &net->ipv6.devconf_all->disable_policy) { 6092 struct net_device *dev; 6093 6094 for_each_netdev(net, dev) { 6095 idev = __in6_dev_get(dev); 6096 if (idev) 6097 addrconf_disable_policy_idev(idev, val); 6098 } 6099 } else { 6100 idev = (struct inet6_dev *)ctl->extra1; 6101 addrconf_disable_policy_idev(idev, val); 6102 } 6103 6104 rtnl_unlock(); 6105 return 0; 6106 } 6107 6108 static 6109 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6110 void __user *buffer, size_t *lenp, 6111 loff_t *ppos) 6112 { 6113 int *valp = ctl->data; 6114 int val = *valp; 6115 loff_t pos = *ppos; 6116 struct ctl_table lctl; 6117 int ret; 6118 6119 lctl = *ctl; 6120 lctl.data = &val; 6121 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6122 6123 if (write && (*valp != val)) 6124 ret = addrconf_disable_policy(ctl, valp, val); 6125 6126 if (ret) 6127 *ppos = pos; 6128 6129 return ret; 6130 } 6131 6132 static int minus_one = -1; 6133 static const int zero = 0; 6134 static const int one = 1; 6135 static const int two_five_five = 255; 6136 6137 static const struct ctl_table addrconf_sysctl[] = { 6138 { 6139 .procname = "forwarding", 6140 .data = &ipv6_devconf.forwarding, 6141 .maxlen = sizeof(int), 6142 .mode = 0644, 6143 .proc_handler = addrconf_sysctl_forward, 6144 }, 6145 { 6146 .procname = "hop_limit", 6147 .data = &ipv6_devconf.hop_limit, 6148 .maxlen = sizeof(int), 6149 .mode = 0644, 6150 .proc_handler = proc_dointvec_minmax, 6151 .extra1 = (void *)&one, 6152 .extra2 = (void *)&two_five_five, 6153 }, 6154 { 6155 .procname = "mtu", 6156 .data = &ipv6_devconf.mtu6, 6157 .maxlen = sizeof(int), 6158 .mode = 0644, 6159 .proc_handler = addrconf_sysctl_mtu, 6160 }, 6161 { 6162 .procname = "accept_ra", 6163 .data = &ipv6_devconf.accept_ra, 6164 .maxlen = sizeof(int), 6165 .mode = 0644, 6166 .proc_handler = proc_dointvec, 6167 }, 6168 { 6169 .procname = "accept_redirects", 6170 .data = &ipv6_devconf.accept_redirects, 6171 .maxlen = sizeof(int), 6172 .mode = 0644, 6173 .proc_handler = proc_dointvec, 6174 }, 6175 { 6176 .procname = "autoconf", 6177 .data = &ipv6_devconf.autoconf, 6178 .maxlen = sizeof(int), 6179 .mode = 0644, 6180 .proc_handler = proc_dointvec, 6181 }, 6182 { 6183 .procname = "dad_transmits", 6184 .data = &ipv6_devconf.dad_transmits, 6185 .maxlen = sizeof(int), 6186 .mode = 0644, 6187 .proc_handler = proc_dointvec, 6188 }, 6189 { 6190 .procname = "router_solicitations", 6191 .data = &ipv6_devconf.rtr_solicits, 6192 .maxlen = sizeof(int), 6193 .mode = 0644, 6194 .proc_handler = proc_dointvec_minmax, 6195 .extra1 = &minus_one, 6196 }, 6197 { 6198 .procname = "router_solicitation_interval", 6199 .data = &ipv6_devconf.rtr_solicit_interval, 6200 .maxlen = sizeof(int), 6201 .mode = 0644, 6202 .proc_handler = proc_dointvec_jiffies, 6203 }, 6204 { 6205 .procname = "router_solicitation_max_interval", 6206 .data = &ipv6_devconf.rtr_solicit_max_interval, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = proc_dointvec_jiffies, 6210 }, 6211 { 6212 .procname = "router_solicitation_delay", 6213 .data = &ipv6_devconf.rtr_solicit_delay, 6214 .maxlen = sizeof(int), 6215 .mode = 0644, 6216 .proc_handler = proc_dointvec_jiffies, 6217 }, 6218 { 6219 .procname = "force_mld_version", 6220 .data = &ipv6_devconf.force_mld_version, 6221 .maxlen = sizeof(int), 6222 .mode = 0644, 6223 .proc_handler = proc_dointvec, 6224 }, 6225 { 6226 .procname = "mldv1_unsolicited_report_interval", 6227 .data = 6228 &ipv6_devconf.mldv1_unsolicited_report_interval, 6229 .maxlen = sizeof(int), 6230 .mode = 0644, 6231 .proc_handler = proc_dointvec_ms_jiffies, 6232 }, 6233 { 6234 .procname = "mldv2_unsolicited_report_interval", 6235 .data = 6236 &ipv6_devconf.mldv2_unsolicited_report_interval, 6237 .maxlen = sizeof(int), 6238 .mode = 0644, 6239 .proc_handler = proc_dointvec_ms_jiffies, 6240 }, 6241 { 6242 .procname = "use_tempaddr", 6243 .data = &ipv6_devconf.use_tempaddr, 6244 .maxlen = sizeof(int), 6245 .mode = 0644, 6246 .proc_handler = proc_dointvec, 6247 }, 6248 { 6249 .procname = "temp_valid_lft", 6250 .data = &ipv6_devconf.temp_valid_lft, 6251 .maxlen = sizeof(int), 6252 .mode = 0644, 6253 .proc_handler = proc_dointvec, 6254 }, 6255 { 6256 .procname = "temp_prefered_lft", 6257 .data = &ipv6_devconf.temp_prefered_lft, 6258 .maxlen = sizeof(int), 6259 .mode = 0644, 6260 .proc_handler = proc_dointvec, 6261 }, 6262 { 6263 .procname = "regen_max_retry", 6264 .data = &ipv6_devconf.regen_max_retry, 6265 .maxlen = sizeof(int), 6266 .mode = 0644, 6267 .proc_handler = proc_dointvec, 6268 }, 6269 { 6270 .procname = "max_desync_factor", 6271 .data = &ipv6_devconf.max_desync_factor, 6272 .maxlen = sizeof(int), 6273 .mode = 0644, 6274 .proc_handler = proc_dointvec, 6275 }, 6276 { 6277 .procname = "max_addresses", 6278 .data = &ipv6_devconf.max_addresses, 6279 .maxlen = sizeof(int), 6280 .mode = 0644, 6281 .proc_handler = proc_dointvec, 6282 }, 6283 { 6284 .procname = "accept_ra_defrtr", 6285 .data = &ipv6_devconf.accept_ra_defrtr, 6286 .maxlen = sizeof(int), 6287 .mode = 0644, 6288 .proc_handler = proc_dointvec, 6289 }, 6290 { 6291 .procname = "accept_ra_min_hop_limit", 6292 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6293 .maxlen = sizeof(int), 6294 .mode = 0644, 6295 .proc_handler = proc_dointvec, 6296 }, 6297 { 6298 .procname = "accept_ra_pinfo", 6299 .data = &ipv6_devconf.accept_ra_pinfo, 6300 .maxlen = sizeof(int), 6301 .mode = 0644, 6302 .proc_handler = proc_dointvec, 6303 }, 6304 #ifdef CONFIG_IPV6_ROUTER_PREF 6305 { 6306 .procname = "accept_ra_rtr_pref", 6307 .data = &ipv6_devconf.accept_ra_rtr_pref, 6308 .maxlen = sizeof(int), 6309 .mode = 0644, 6310 .proc_handler = proc_dointvec, 6311 }, 6312 { 6313 .procname = "router_probe_interval", 6314 .data = &ipv6_devconf.rtr_probe_interval, 6315 .maxlen = sizeof(int), 6316 .mode = 0644, 6317 .proc_handler = proc_dointvec_jiffies, 6318 }, 6319 #ifdef CONFIG_IPV6_ROUTE_INFO 6320 { 6321 .procname = "accept_ra_rt_info_min_plen", 6322 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6323 .maxlen = sizeof(int), 6324 .mode = 0644, 6325 .proc_handler = proc_dointvec, 6326 }, 6327 { 6328 .procname = "accept_ra_rt_info_max_plen", 6329 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6330 .maxlen = sizeof(int), 6331 .mode = 0644, 6332 .proc_handler = proc_dointvec, 6333 }, 6334 #endif 6335 #endif 6336 { 6337 .procname = "proxy_ndp", 6338 .data = &ipv6_devconf.proxy_ndp, 6339 .maxlen = sizeof(int), 6340 .mode = 0644, 6341 .proc_handler = addrconf_sysctl_proxy_ndp, 6342 }, 6343 { 6344 .procname = "accept_source_route", 6345 .data = &ipv6_devconf.accept_source_route, 6346 .maxlen = sizeof(int), 6347 .mode = 0644, 6348 .proc_handler = proc_dointvec, 6349 }, 6350 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6351 { 6352 .procname = "optimistic_dad", 6353 .data = &ipv6_devconf.optimistic_dad, 6354 .maxlen = sizeof(int), 6355 .mode = 0644, 6356 .proc_handler = proc_dointvec, 6357 }, 6358 { 6359 .procname = "use_optimistic", 6360 .data = &ipv6_devconf.use_optimistic, 6361 .maxlen = sizeof(int), 6362 .mode = 0644, 6363 .proc_handler = proc_dointvec, 6364 }, 6365 #endif 6366 #ifdef CONFIG_IPV6_MROUTE 6367 { 6368 .procname = "mc_forwarding", 6369 .data = &ipv6_devconf.mc_forwarding, 6370 .maxlen = sizeof(int), 6371 .mode = 0444, 6372 .proc_handler = proc_dointvec, 6373 }, 6374 #endif 6375 { 6376 .procname = "disable_ipv6", 6377 .data = &ipv6_devconf.disable_ipv6, 6378 .maxlen = sizeof(int), 6379 .mode = 0644, 6380 .proc_handler = addrconf_sysctl_disable, 6381 }, 6382 { 6383 .procname = "accept_dad", 6384 .data = &ipv6_devconf.accept_dad, 6385 .maxlen = sizeof(int), 6386 .mode = 0644, 6387 .proc_handler = proc_dointvec, 6388 }, 6389 { 6390 .procname = "force_tllao", 6391 .data = &ipv6_devconf.force_tllao, 6392 .maxlen = sizeof(int), 6393 .mode = 0644, 6394 .proc_handler = proc_dointvec 6395 }, 6396 { 6397 .procname = "ndisc_notify", 6398 .data = &ipv6_devconf.ndisc_notify, 6399 .maxlen = sizeof(int), 6400 .mode = 0644, 6401 .proc_handler = proc_dointvec 6402 }, 6403 { 6404 .procname = "suppress_frag_ndisc", 6405 .data = &ipv6_devconf.suppress_frag_ndisc, 6406 .maxlen = sizeof(int), 6407 .mode = 0644, 6408 .proc_handler = proc_dointvec 6409 }, 6410 { 6411 .procname = "accept_ra_from_local", 6412 .data = &ipv6_devconf.accept_ra_from_local, 6413 .maxlen = sizeof(int), 6414 .mode = 0644, 6415 .proc_handler = proc_dointvec, 6416 }, 6417 { 6418 .procname = "accept_ra_mtu", 6419 .data = &ipv6_devconf.accept_ra_mtu, 6420 .maxlen = sizeof(int), 6421 .mode = 0644, 6422 .proc_handler = proc_dointvec, 6423 }, 6424 { 6425 .procname = "stable_secret", 6426 .data = &ipv6_devconf.stable_secret, 6427 .maxlen = IPV6_MAX_STRLEN, 6428 .mode = 0600, 6429 .proc_handler = addrconf_sysctl_stable_secret, 6430 }, 6431 { 6432 .procname = "use_oif_addrs_only", 6433 .data = &ipv6_devconf.use_oif_addrs_only, 6434 .maxlen = sizeof(int), 6435 .mode = 0644, 6436 .proc_handler = proc_dointvec, 6437 }, 6438 { 6439 .procname = "ignore_routes_with_linkdown", 6440 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6441 .maxlen = sizeof(int), 6442 .mode = 0644, 6443 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6444 }, 6445 { 6446 .procname = "drop_unicast_in_l2_multicast", 6447 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6448 .maxlen = sizeof(int), 6449 .mode = 0644, 6450 .proc_handler = proc_dointvec, 6451 }, 6452 { 6453 .procname = "drop_unsolicited_na", 6454 .data = &ipv6_devconf.drop_unsolicited_na, 6455 .maxlen = sizeof(int), 6456 .mode = 0644, 6457 .proc_handler = proc_dointvec, 6458 }, 6459 { 6460 .procname = "keep_addr_on_down", 6461 .data = &ipv6_devconf.keep_addr_on_down, 6462 .maxlen = sizeof(int), 6463 .mode = 0644, 6464 .proc_handler = proc_dointvec, 6465 6466 }, 6467 { 6468 .procname = "seg6_enabled", 6469 .data = &ipv6_devconf.seg6_enabled, 6470 .maxlen = sizeof(int), 6471 .mode = 0644, 6472 .proc_handler = proc_dointvec, 6473 }, 6474 #ifdef CONFIG_IPV6_SEG6_HMAC 6475 { 6476 .procname = "seg6_require_hmac", 6477 .data = &ipv6_devconf.seg6_require_hmac, 6478 .maxlen = sizeof(int), 6479 .mode = 0644, 6480 .proc_handler = proc_dointvec, 6481 }, 6482 #endif 6483 { 6484 .procname = "enhanced_dad", 6485 .data = &ipv6_devconf.enhanced_dad, 6486 .maxlen = sizeof(int), 6487 .mode = 0644, 6488 .proc_handler = proc_dointvec, 6489 }, 6490 { 6491 .procname = "addr_gen_mode", 6492 .data = &ipv6_devconf.addr_gen_mode, 6493 .maxlen = sizeof(int), 6494 .mode = 0644, 6495 .proc_handler = addrconf_sysctl_addr_gen_mode, 6496 }, 6497 { 6498 .procname = "disable_policy", 6499 .data = &ipv6_devconf.disable_policy, 6500 .maxlen = sizeof(int), 6501 .mode = 0644, 6502 .proc_handler = addrconf_sysctl_disable_policy, 6503 }, 6504 { 6505 .procname = "ndisc_tclass", 6506 .data = &ipv6_devconf.ndisc_tclass, 6507 .maxlen = sizeof(int), 6508 .mode = 0644, 6509 .proc_handler = proc_dointvec_minmax, 6510 .extra1 = (void *)&zero, 6511 .extra2 = (void *)&two_five_five, 6512 }, 6513 { 6514 /* sentinel */ 6515 } 6516 }; 6517 6518 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6519 struct inet6_dev *idev, struct ipv6_devconf *p) 6520 { 6521 int i, ifindex; 6522 struct ctl_table *table; 6523 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6524 6525 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6526 if (!table) 6527 goto out; 6528 6529 for (i = 0; table[i].data; i++) { 6530 table[i].data += (char *)p - (char *)&ipv6_devconf; 6531 /* If one of these is already set, then it is not safe to 6532 * overwrite either of them: this makes proc_dointvec_minmax 6533 * usable. 6534 */ 6535 if (!table[i].extra1 && !table[i].extra2) { 6536 table[i].extra1 = idev; /* embedded; no ref */ 6537 table[i].extra2 = net; 6538 } 6539 } 6540 6541 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6542 6543 p->sysctl_header = register_net_sysctl(net, path, table); 6544 if (!p->sysctl_header) 6545 goto free; 6546 6547 if (!strcmp(dev_name, "all")) 6548 ifindex = NETCONFA_IFINDEX_ALL; 6549 else if (!strcmp(dev_name, "default")) 6550 ifindex = NETCONFA_IFINDEX_DEFAULT; 6551 else 6552 ifindex = idev->dev->ifindex; 6553 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6554 ifindex, p); 6555 return 0; 6556 6557 free: 6558 kfree(table); 6559 out: 6560 return -ENOBUFS; 6561 } 6562 6563 static void __addrconf_sysctl_unregister(struct net *net, 6564 struct ipv6_devconf *p, int ifindex) 6565 { 6566 struct ctl_table *table; 6567 6568 if (!p->sysctl_header) 6569 return; 6570 6571 table = p->sysctl_header->ctl_table_arg; 6572 unregister_net_sysctl_table(p->sysctl_header); 6573 p->sysctl_header = NULL; 6574 kfree(table); 6575 6576 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6577 } 6578 6579 static int addrconf_sysctl_register(struct inet6_dev *idev) 6580 { 6581 int err; 6582 6583 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6584 return -EINVAL; 6585 6586 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6587 &ndisc_ifinfo_sysctl_change); 6588 if (err) 6589 return err; 6590 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6591 idev, &idev->cnf); 6592 if (err) 6593 neigh_sysctl_unregister(idev->nd_parms); 6594 6595 return err; 6596 } 6597 6598 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6599 { 6600 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6601 idev->dev->ifindex); 6602 neigh_sysctl_unregister(idev->nd_parms); 6603 } 6604 6605 6606 #endif 6607 6608 static int __net_init addrconf_init_net(struct net *net) 6609 { 6610 int err = -ENOMEM; 6611 struct ipv6_devconf *all, *dflt; 6612 6613 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6614 if (!all) 6615 goto err_alloc_all; 6616 6617 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6618 if (!dflt) 6619 goto err_alloc_dflt; 6620 6621 /* these will be inherited by all namespaces */ 6622 dflt->autoconf = ipv6_defaults.autoconf; 6623 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6624 6625 dflt->stable_secret.initialized = false; 6626 all->stable_secret.initialized = false; 6627 6628 net->ipv6.devconf_all = all; 6629 net->ipv6.devconf_dflt = dflt; 6630 6631 #ifdef CONFIG_SYSCTL 6632 err = __addrconf_sysctl_register(net, "all", NULL, all); 6633 if (err < 0) 6634 goto err_reg_all; 6635 6636 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6637 if (err < 0) 6638 goto err_reg_dflt; 6639 #endif 6640 return 0; 6641 6642 #ifdef CONFIG_SYSCTL 6643 err_reg_dflt: 6644 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6645 err_reg_all: 6646 kfree(dflt); 6647 #endif 6648 err_alloc_dflt: 6649 kfree(all); 6650 err_alloc_all: 6651 return err; 6652 } 6653 6654 static void __net_exit addrconf_exit_net(struct net *net) 6655 { 6656 #ifdef CONFIG_SYSCTL 6657 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6658 NETCONFA_IFINDEX_DEFAULT); 6659 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6660 NETCONFA_IFINDEX_ALL); 6661 #endif 6662 kfree(net->ipv6.devconf_dflt); 6663 kfree(net->ipv6.devconf_all); 6664 } 6665 6666 static struct pernet_operations addrconf_ops = { 6667 .init = addrconf_init_net, 6668 .exit = addrconf_exit_net, 6669 }; 6670 6671 static struct rtnl_af_ops inet6_ops __read_mostly = { 6672 .family = AF_INET6, 6673 .fill_link_af = inet6_fill_link_af, 6674 .get_link_af_size = inet6_get_link_af_size, 6675 .validate_link_af = inet6_validate_link_af, 6676 .set_link_af = inet6_set_link_af, 6677 }; 6678 6679 /* 6680 * Init / cleanup code 6681 */ 6682 6683 int __init addrconf_init(void) 6684 { 6685 struct inet6_dev *idev; 6686 int i, err; 6687 6688 err = ipv6_addr_label_init(); 6689 if (err < 0) { 6690 pr_crit("%s: cannot initialize default policy table: %d\n", 6691 __func__, err); 6692 goto out; 6693 } 6694 6695 err = register_pernet_subsys(&addrconf_ops); 6696 if (err < 0) 6697 goto out_addrlabel; 6698 6699 addrconf_wq = create_workqueue("ipv6_addrconf"); 6700 if (!addrconf_wq) { 6701 err = -ENOMEM; 6702 goto out_nowq; 6703 } 6704 6705 /* The addrconf netdev notifier requires that loopback_dev 6706 * has it's ipv6 private information allocated and setup 6707 * before it can bring up and give link-local addresses 6708 * to other devices which are up. 6709 * 6710 * Unfortunately, loopback_dev is not necessarily the first 6711 * entry in the global dev_base list of net devices. In fact, 6712 * it is likely to be the very last entry on that list. 6713 * So this causes the notifier registry below to try and 6714 * give link-local addresses to all devices besides loopback_dev 6715 * first, then loopback_dev, which cases all the non-loopback_dev 6716 * devices to fail to get a link-local address. 6717 * 6718 * So, as a temporary fix, allocate the ipv6 structure for 6719 * loopback_dev first by hand. 6720 * Longer term, all of the dependencies ipv6 has upon the loopback 6721 * device and it being up should be removed. 6722 */ 6723 rtnl_lock(); 6724 idev = ipv6_add_dev(init_net.loopback_dev); 6725 rtnl_unlock(); 6726 if (IS_ERR(idev)) { 6727 err = PTR_ERR(idev); 6728 goto errlo; 6729 } 6730 6731 ip6_route_init_special_entries(); 6732 6733 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6734 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6735 6736 register_netdevice_notifier(&ipv6_dev_notf); 6737 6738 addrconf_verify(); 6739 6740 rtnl_af_register(&inet6_ops); 6741 6742 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6743 NULL, inet6_dump_ifinfo, 0); 6744 if (err < 0) 6745 goto errout; 6746 6747 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6748 inet6_rtm_newaddr, NULL, 0); 6749 if (err < 0) 6750 goto errout; 6751 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6752 inet6_rtm_deladdr, NULL, 0); 6753 if (err < 0) 6754 goto errout; 6755 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6756 inet6_rtm_getaddr, inet6_dump_ifaddr, 6757 RTNL_FLAG_DOIT_UNLOCKED); 6758 if (err < 0) 6759 goto errout; 6760 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6761 NULL, inet6_dump_ifmcaddr, 0); 6762 if (err < 0) 6763 goto errout; 6764 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6765 NULL, inet6_dump_ifacaddr, 0); 6766 if (err < 0) 6767 goto errout; 6768 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6769 inet6_netconf_get_devconf, 6770 inet6_netconf_dump_devconf, 6771 RTNL_FLAG_DOIT_UNLOCKED); 6772 if (err < 0) 6773 goto errout; 6774 err = ipv6_addr_label_rtnl_register(); 6775 if (err < 0) 6776 goto errout; 6777 6778 return 0; 6779 errout: 6780 rtnl_unregister_all(PF_INET6); 6781 rtnl_af_unregister(&inet6_ops); 6782 unregister_netdevice_notifier(&ipv6_dev_notf); 6783 errlo: 6784 destroy_workqueue(addrconf_wq); 6785 out_nowq: 6786 unregister_pernet_subsys(&addrconf_ops); 6787 out_addrlabel: 6788 ipv6_addr_label_cleanup(); 6789 out: 6790 return err; 6791 } 6792 6793 void addrconf_cleanup(void) 6794 { 6795 struct net_device *dev; 6796 int i; 6797 6798 unregister_netdevice_notifier(&ipv6_dev_notf); 6799 unregister_pernet_subsys(&addrconf_ops); 6800 ipv6_addr_label_cleanup(); 6801 6802 rtnl_af_unregister(&inet6_ops); 6803 6804 rtnl_lock(); 6805 6806 /* clean dev list */ 6807 for_each_netdev(&init_net, dev) { 6808 if (__in6_dev_get(dev) == NULL) 6809 continue; 6810 addrconf_ifdown(dev, 1); 6811 } 6812 addrconf_ifdown(init_net.loopback_dev, 2); 6813 6814 /* 6815 * Check hash table. 6816 */ 6817 spin_lock_bh(&addrconf_hash_lock); 6818 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6819 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6820 spin_unlock_bh(&addrconf_hash_lock); 6821 cancel_delayed_work(&addr_chk_work); 6822 rtnl_unlock(); 6823 6824 destroy_workqueue(addrconf_wq); 6825 } 6826