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 rt6_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 ip6_rt_put(ifp->rt); 920 921 kfree_rcu(ifp, rcu); 922 } 923 924 static void 925 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 926 { 927 struct list_head *p; 928 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 929 930 /* 931 * Each device address list is sorted in order of scope - 932 * global before linklocal. 933 */ 934 list_for_each(p, &idev->addr_list) { 935 struct inet6_ifaddr *ifa 936 = list_entry(p, struct inet6_ifaddr, if_list); 937 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 938 break; 939 } 940 941 list_add_tail_rcu(&ifp->if_list, p); 942 } 943 944 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 945 { 946 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 947 948 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 949 } 950 951 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 952 struct net_device *dev, unsigned int hash) 953 { 954 struct inet6_ifaddr *ifp; 955 956 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 957 if (!net_eq(dev_net(ifp->idev->dev), net)) 958 continue; 959 if (ipv6_addr_equal(&ifp->addr, addr)) { 960 if (!dev || ifp->idev->dev == dev) 961 return true; 962 } 963 } 964 return false; 965 } 966 967 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 968 { 969 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 970 int err = 0; 971 972 spin_lock(&addrconf_hash_lock); 973 974 /* Ignore adding duplicate addresses on an interface */ 975 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 976 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 977 err = -EEXIST; 978 } else { 979 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 980 } 981 982 spin_unlock(&addrconf_hash_lock); 983 984 return err; 985 } 986 987 /* On success it returns ifp with increased reference count */ 988 989 static struct inet6_ifaddr * 990 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 991 const struct in6_addr *peer_addr, int pfxlen, 992 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 993 bool can_block, struct netlink_ext_ack *extack) 994 { 995 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 996 struct net *net = dev_net(idev->dev); 997 struct inet6_ifaddr *ifa = NULL; 998 struct rt6_info *rt = NULL; 999 int err = 0; 1000 int addr_type = ipv6_addr_type(addr); 1001 1002 if (addr_type == IPV6_ADDR_ANY || 1003 addr_type & IPV6_ADDR_MULTICAST || 1004 (!(idev->dev->flags & IFF_LOOPBACK) && 1005 addr_type & IPV6_ADDR_LOOPBACK)) 1006 return ERR_PTR(-EADDRNOTAVAIL); 1007 1008 if (idev->dead) { 1009 err = -ENODEV; /*XXX*/ 1010 goto out; 1011 } 1012 1013 if (idev->cnf.disable_ipv6) { 1014 err = -EACCES; 1015 goto out; 1016 } 1017 1018 /* validator notifier needs to be blocking; 1019 * do not call in atomic context 1020 */ 1021 if (can_block) { 1022 struct in6_validator_info i6vi = { 1023 .i6vi_addr = *addr, 1024 .i6vi_dev = idev, 1025 .extack = extack, 1026 }; 1027 1028 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1029 err = notifier_to_errno(err); 1030 if (err < 0) 1031 goto out; 1032 } 1033 1034 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1035 if (!ifa) { 1036 err = -ENOBUFS; 1037 goto out; 1038 } 1039 1040 rt = addrconf_dst_alloc(idev, addr, false); 1041 if (IS_ERR(rt)) { 1042 err = PTR_ERR(rt); 1043 rt = NULL; 1044 goto out; 1045 } 1046 1047 if (net->ipv6.devconf_all->disable_policy || 1048 idev->cnf.disable_policy) 1049 rt->dst.flags |= DST_NOPOLICY; 1050 1051 neigh_parms_data_state_setall(idev->nd_parms); 1052 1053 ifa->addr = *addr; 1054 if (peer_addr) 1055 ifa->peer_addr = *peer_addr; 1056 1057 spin_lock_init(&ifa->lock); 1058 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1059 INIT_HLIST_NODE(&ifa->addr_lst); 1060 ifa->scope = scope; 1061 ifa->prefix_len = pfxlen; 1062 ifa->flags = flags; 1063 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1064 if (!(flags & IFA_F_NODAD)) 1065 ifa->flags |= IFA_F_TENTATIVE; 1066 ifa->valid_lft = valid_lft; 1067 ifa->prefered_lft = prefered_lft; 1068 ifa->cstamp = ifa->tstamp = jiffies; 1069 ifa->tokenized = false; 1070 1071 ifa->rt = rt; 1072 1073 ifa->idev = idev; 1074 in6_dev_hold(idev); 1075 1076 /* For caller */ 1077 refcount_set(&ifa->refcnt, 1); 1078 1079 rcu_read_lock_bh(); 1080 1081 err = ipv6_add_addr_hash(idev->dev, ifa); 1082 if (err < 0) { 1083 rcu_read_unlock_bh(); 1084 goto out; 1085 } 1086 1087 write_lock(&idev->lock); 1088 1089 /* Add to inet6_dev unicast addr list. */ 1090 ipv6_link_dev_addr(idev, ifa); 1091 1092 if (ifa->flags&IFA_F_TEMPORARY) { 1093 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1094 in6_ifa_hold(ifa); 1095 } 1096 1097 in6_ifa_hold(ifa); 1098 write_unlock(&idev->lock); 1099 1100 rcu_read_unlock_bh(); 1101 1102 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1103 out: 1104 if (unlikely(err < 0)) { 1105 if (rt) 1106 ip6_rt_put(rt); 1107 if (ifa) { 1108 if (ifa->idev) 1109 in6_dev_put(ifa->idev); 1110 kfree(ifa); 1111 } 1112 ifa = ERR_PTR(err); 1113 } 1114 1115 return ifa; 1116 } 1117 1118 enum cleanup_prefix_rt_t { 1119 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1120 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1121 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1122 }; 1123 1124 /* 1125 * Check, whether the prefix for ifp would still need a prefix route 1126 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1127 * constants. 1128 * 1129 * 1) we don't purge prefix if address was not permanent. 1130 * prefix is managed by its own lifetime. 1131 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1132 * 3) if there are no addresses, delete prefix. 1133 * 4) if there are still other permanent address(es), 1134 * corresponding prefix is still permanent. 1135 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1136 * don't purge the prefix, assume user space is managing it. 1137 * 6) otherwise, update prefix lifetime to the 1138 * longest valid lifetime among the corresponding 1139 * addresses on the device. 1140 * Note: subsequent RA will update lifetime. 1141 **/ 1142 static enum cleanup_prefix_rt_t 1143 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1144 { 1145 struct inet6_ifaddr *ifa; 1146 struct inet6_dev *idev = ifp->idev; 1147 unsigned long lifetime; 1148 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1149 1150 *expires = jiffies; 1151 1152 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1153 if (ifa == ifp) 1154 continue; 1155 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1156 ifp->prefix_len)) 1157 continue; 1158 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1159 return CLEANUP_PREFIX_RT_NOP; 1160 1161 action = CLEANUP_PREFIX_RT_EXPIRE; 1162 1163 spin_lock(&ifa->lock); 1164 1165 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1166 /* 1167 * Note: Because this address is 1168 * not permanent, lifetime < 1169 * LONG_MAX / HZ here. 1170 */ 1171 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1172 *expires = ifa->tstamp + lifetime * HZ; 1173 spin_unlock(&ifa->lock); 1174 } 1175 1176 return action; 1177 } 1178 1179 static void 1180 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1181 { 1182 struct rt6_info *rt; 1183 1184 rt = addrconf_get_prefix_route(&ifp->addr, 1185 ifp->prefix_len, 1186 ifp->idev->dev, 1187 0, RTF_GATEWAY | RTF_DEFAULT); 1188 if (rt) { 1189 if (del_rt) 1190 ip6_del_rt(rt); 1191 else { 1192 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1193 rt6_set_expires(rt, expires); 1194 ip6_rt_put(rt); 1195 } 1196 } 1197 } 1198 1199 1200 /* This function wants to get referenced ifp and releases it before return */ 1201 1202 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1203 { 1204 int state; 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1206 unsigned long expires; 1207 1208 ASSERT_RTNL(); 1209 1210 spin_lock_bh(&ifp->lock); 1211 state = ifp->state; 1212 ifp->state = INET6_IFADDR_STATE_DEAD; 1213 spin_unlock_bh(&ifp->lock); 1214 1215 if (state == INET6_IFADDR_STATE_DEAD) 1216 goto out; 1217 1218 spin_lock_bh(&addrconf_hash_lock); 1219 hlist_del_init_rcu(&ifp->addr_lst); 1220 spin_unlock_bh(&addrconf_hash_lock); 1221 1222 write_lock_bh(&ifp->idev->lock); 1223 1224 if (ifp->flags&IFA_F_TEMPORARY) { 1225 list_del(&ifp->tmp_list); 1226 if (ifp->ifpub) { 1227 in6_ifa_put(ifp->ifpub); 1228 ifp->ifpub = NULL; 1229 } 1230 __in6_ifa_put(ifp); 1231 } 1232 1233 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1234 action = check_cleanup_prefix_route(ifp, &expires); 1235 1236 list_del_rcu(&ifp->if_list); 1237 __in6_ifa_put(ifp); 1238 1239 write_unlock_bh(&ifp->idev->lock); 1240 1241 addrconf_del_dad_work(ifp); 1242 1243 ipv6_ifa_notify(RTM_DELADDR, ifp); 1244 1245 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1246 1247 if (action != CLEANUP_PREFIX_RT_NOP) { 1248 cleanup_prefix_route(ifp, expires, 1249 action == CLEANUP_PREFIX_RT_DEL); 1250 } 1251 1252 /* clean up prefsrc entries */ 1253 rt6_remove_prefsrc(ifp); 1254 out: 1255 in6_ifa_put(ifp); 1256 } 1257 1258 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1259 struct inet6_ifaddr *ift, 1260 bool block) 1261 { 1262 struct inet6_dev *idev = ifp->idev; 1263 struct in6_addr addr, *tmpaddr; 1264 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1265 unsigned long regen_advance; 1266 int tmp_plen; 1267 int ret = 0; 1268 u32 addr_flags; 1269 unsigned long now = jiffies; 1270 long max_desync_factor; 1271 s32 cnf_temp_preferred_lft; 1272 1273 write_lock_bh(&idev->lock); 1274 if (ift) { 1275 spin_lock_bh(&ift->lock); 1276 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1277 spin_unlock_bh(&ift->lock); 1278 tmpaddr = &addr; 1279 } else { 1280 tmpaddr = NULL; 1281 } 1282 retry: 1283 in6_dev_hold(idev); 1284 if (idev->cnf.use_tempaddr <= 0) { 1285 write_unlock_bh(&idev->lock); 1286 pr_info("%s: use_tempaddr is disabled\n", __func__); 1287 in6_dev_put(idev); 1288 ret = -1; 1289 goto out; 1290 } 1291 spin_lock_bh(&ifp->lock); 1292 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1293 idev->cnf.use_tempaddr = -1; /*XXX*/ 1294 spin_unlock_bh(&ifp->lock); 1295 write_unlock_bh(&idev->lock); 1296 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1297 __func__); 1298 in6_dev_put(idev); 1299 ret = -1; 1300 goto out; 1301 } 1302 in6_ifa_hold(ifp); 1303 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1304 ipv6_try_regen_rndid(idev, tmpaddr); 1305 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1306 age = (now - ifp->tstamp) / HZ; 1307 1308 regen_advance = idev->cnf.regen_max_retry * 1309 idev->cnf.dad_transmits * 1310 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1311 1312 /* recalculate max_desync_factor each time and update 1313 * idev->desync_factor if it's larger 1314 */ 1315 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1316 max_desync_factor = min_t(__u32, 1317 idev->cnf.max_desync_factor, 1318 cnf_temp_preferred_lft - regen_advance); 1319 1320 if (unlikely(idev->desync_factor > max_desync_factor)) { 1321 if (max_desync_factor > 0) { 1322 get_random_bytes(&idev->desync_factor, 1323 sizeof(idev->desync_factor)); 1324 idev->desync_factor %= max_desync_factor; 1325 } else { 1326 idev->desync_factor = 0; 1327 } 1328 } 1329 1330 tmp_valid_lft = min_t(__u32, 1331 ifp->valid_lft, 1332 idev->cnf.temp_valid_lft + age); 1333 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1334 idev->desync_factor; 1335 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1336 tmp_plen = ifp->prefix_len; 1337 tmp_tstamp = ifp->tstamp; 1338 spin_unlock_bh(&ifp->lock); 1339 1340 write_unlock_bh(&idev->lock); 1341 1342 /* A temporary address is created only if this calculated Preferred 1343 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1344 * an implementation must not create a temporary address with a zero 1345 * Preferred Lifetime. 1346 * Use age calculation as in addrconf_verify to avoid unnecessary 1347 * temporary addresses being generated. 1348 */ 1349 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1350 if (tmp_prefered_lft <= regen_advance + age) { 1351 in6_ifa_put(ifp); 1352 in6_dev_put(idev); 1353 ret = -1; 1354 goto out; 1355 } 1356 1357 addr_flags = IFA_F_TEMPORARY; 1358 /* set in addrconf_prefix_rcv() */ 1359 if (ifp->flags & IFA_F_OPTIMISTIC) 1360 addr_flags |= IFA_F_OPTIMISTIC; 1361 1362 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1363 ipv6_addr_scope(&addr), addr_flags, 1364 tmp_valid_lft, tmp_prefered_lft, block, NULL); 1365 if (IS_ERR(ift)) { 1366 in6_ifa_put(ifp); 1367 in6_dev_put(idev); 1368 pr_info("%s: retry temporary address regeneration\n", __func__); 1369 tmpaddr = &addr; 1370 write_lock_bh(&idev->lock); 1371 goto retry; 1372 } 1373 1374 spin_lock_bh(&ift->lock); 1375 ift->ifpub = ifp; 1376 ift->cstamp = now; 1377 ift->tstamp = tmp_tstamp; 1378 spin_unlock_bh(&ift->lock); 1379 1380 addrconf_dad_start(ift); 1381 in6_ifa_put(ift); 1382 in6_dev_put(idev); 1383 out: 1384 return ret; 1385 } 1386 1387 /* 1388 * Choose an appropriate source address (RFC3484) 1389 */ 1390 enum { 1391 IPV6_SADDR_RULE_INIT = 0, 1392 IPV6_SADDR_RULE_LOCAL, 1393 IPV6_SADDR_RULE_SCOPE, 1394 IPV6_SADDR_RULE_PREFERRED, 1395 #ifdef CONFIG_IPV6_MIP6 1396 IPV6_SADDR_RULE_HOA, 1397 #endif 1398 IPV6_SADDR_RULE_OIF, 1399 IPV6_SADDR_RULE_LABEL, 1400 IPV6_SADDR_RULE_PRIVACY, 1401 IPV6_SADDR_RULE_ORCHID, 1402 IPV6_SADDR_RULE_PREFIX, 1403 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1404 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1405 #endif 1406 IPV6_SADDR_RULE_MAX 1407 }; 1408 1409 struct ipv6_saddr_score { 1410 int rule; 1411 int addr_type; 1412 struct inet6_ifaddr *ifa; 1413 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1414 int scopedist; 1415 int matchlen; 1416 }; 1417 1418 struct ipv6_saddr_dst { 1419 const struct in6_addr *addr; 1420 int ifindex; 1421 int scope; 1422 int label; 1423 unsigned int prefs; 1424 }; 1425 1426 static inline int ipv6_saddr_preferred(int type) 1427 { 1428 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1429 return 1; 1430 return 0; 1431 } 1432 1433 static bool ipv6_use_optimistic_addr(struct net *net, 1434 struct inet6_dev *idev) 1435 { 1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1437 if (!idev) 1438 return false; 1439 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1440 return false; 1441 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1442 return false; 1443 1444 return true; 1445 #else 1446 return false; 1447 #endif 1448 } 1449 1450 static bool ipv6_allow_optimistic_dad(struct net *net, 1451 struct inet6_dev *idev) 1452 { 1453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1454 if (!idev) 1455 return false; 1456 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1457 return false; 1458 1459 return true; 1460 #else 1461 return false; 1462 #endif 1463 } 1464 1465 static int ipv6_get_saddr_eval(struct net *net, 1466 struct ipv6_saddr_score *score, 1467 struct ipv6_saddr_dst *dst, 1468 int i) 1469 { 1470 int ret; 1471 1472 if (i <= score->rule) { 1473 switch (i) { 1474 case IPV6_SADDR_RULE_SCOPE: 1475 ret = score->scopedist; 1476 break; 1477 case IPV6_SADDR_RULE_PREFIX: 1478 ret = score->matchlen; 1479 break; 1480 default: 1481 ret = !!test_bit(i, score->scorebits); 1482 } 1483 goto out; 1484 } 1485 1486 switch (i) { 1487 case IPV6_SADDR_RULE_INIT: 1488 /* Rule 0: remember if hiscore is not ready yet */ 1489 ret = !!score->ifa; 1490 break; 1491 case IPV6_SADDR_RULE_LOCAL: 1492 /* Rule 1: Prefer same address */ 1493 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1494 break; 1495 case IPV6_SADDR_RULE_SCOPE: 1496 /* Rule 2: Prefer appropriate scope 1497 * 1498 * ret 1499 * ^ 1500 * -1 | d 15 1501 * ---+--+-+---> scope 1502 * | 1503 * | d is scope of the destination. 1504 * B-d | \ 1505 * | \ <- smaller scope is better if 1506 * B-15 | \ if scope is enough for destination. 1507 * | ret = B - scope (-1 <= scope >= d <= 15). 1508 * d-C-1 | / 1509 * |/ <- greater is better 1510 * -C / if scope is not enough for destination. 1511 * /| ret = scope - C (-1 <= d < scope <= 15). 1512 * 1513 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1514 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1515 * Assume B = 0 and we get C > 29. 1516 */ 1517 ret = __ipv6_addr_src_scope(score->addr_type); 1518 if (ret >= dst->scope) 1519 ret = -ret; 1520 else 1521 ret -= 128; /* 30 is enough */ 1522 score->scopedist = ret; 1523 break; 1524 case IPV6_SADDR_RULE_PREFERRED: 1525 { 1526 /* Rule 3: Avoid deprecated and optimistic addresses */ 1527 u8 avoid = IFA_F_DEPRECATED; 1528 1529 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1530 avoid |= IFA_F_OPTIMISTIC; 1531 ret = ipv6_saddr_preferred(score->addr_type) || 1532 !(score->ifa->flags & avoid); 1533 break; 1534 } 1535 #ifdef CONFIG_IPV6_MIP6 1536 case IPV6_SADDR_RULE_HOA: 1537 { 1538 /* Rule 4: Prefer home address */ 1539 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1540 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1541 break; 1542 } 1543 #endif 1544 case IPV6_SADDR_RULE_OIF: 1545 /* Rule 5: Prefer outgoing interface */ 1546 ret = (!dst->ifindex || 1547 dst->ifindex == score->ifa->idev->dev->ifindex); 1548 break; 1549 case IPV6_SADDR_RULE_LABEL: 1550 /* Rule 6: Prefer matching label */ 1551 ret = ipv6_addr_label(net, 1552 &score->ifa->addr, score->addr_type, 1553 score->ifa->idev->dev->ifindex) == dst->label; 1554 break; 1555 case IPV6_SADDR_RULE_PRIVACY: 1556 { 1557 /* Rule 7: Prefer public address 1558 * Note: prefer temporary address if use_tempaddr >= 2 1559 */ 1560 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1561 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1562 score->ifa->idev->cnf.use_tempaddr >= 2; 1563 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1564 break; 1565 } 1566 case IPV6_SADDR_RULE_ORCHID: 1567 /* Rule 8-: Prefer ORCHID vs ORCHID or 1568 * non-ORCHID vs non-ORCHID 1569 */ 1570 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1571 ipv6_addr_orchid(dst->addr)); 1572 break; 1573 case IPV6_SADDR_RULE_PREFIX: 1574 /* Rule 8: Use longest matching prefix */ 1575 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1576 if (ret > score->ifa->prefix_len) 1577 ret = score->ifa->prefix_len; 1578 score->matchlen = ret; 1579 break; 1580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1581 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1582 /* Optimistic addresses still have lower precedence than other 1583 * preferred addresses. 1584 */ 1585 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1586 break; 1587 #endif 1588 default: 1589 ret = 0; 1590 } 1591 1592 if (ret) 1593 __set_bit(i, score->scorebits); 1594 score->rule = i; 1595 out: 1596 return ret; 1597 } 1598 1599 static int __ipv6_dev_get_saddr(struct net *net, 1600 struct ipv6_saddr_dst *dst, 1601 struct inet6_dev *idev, 1602 struct ipv6_saddr_score *scores, 1603 int hiscore_idx) 1604 { 1605 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1606 1607 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1608 int i; 1609 1610 /* 1611 * - Tentative Address (RFC2462 section 5.4) 1612 * - A tentative address is not considered 1613 * "assigned to an interface" in the traditional 1614 * sense, unless it is also flagged as optimistic. 1615 * - Candidate Source Address (section 4) 1616 * - In any case, anycast addresses, multicast 1617 * addresses, and the unspecified address MUST 1618 * NOT be included in a candidate set. 1619 */ 1620 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1621 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1622 continue; 1623 1624 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1625 1626 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1627 score->addr_type & IPV6_ADDR_MULTICAST)) { 1628 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1629 idev->dev->name); 1630 continue; 1631 } 1632 1633 score->rule = -1; 1634 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1635 1636 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1637 int minihiscore, miniscore; 1638 1639 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1640 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1641 1642 if (minihiscore > miniscore) { 1643 if (i == IPV6_SADDR_RULE_SCOPE && 1644 score->scopedist > 0) { 1645 /* 1646 * special case: 1647 * each remaining entry 1648 * has too small (not enough) 1649 * scope, because ifa entries 1650 * are sorted by their scope 1651 * values. 1652 */ 1653 goto out; 1654 } 1655 break; 1656 } else if (minihiscore < miniscore) { 1657 swap(hiscore, score); 1658 hiscore_idx = 1 - hiscore_idx; 1659 1660 /* restore our iterator */ 1661 score->ifa = hiscore->ifa; 1662 1663 break; 1664 } 1665 } 1666 } 1667 out: 1668 return hiscore_idx; 1669 } 1670 1671 static int ipv6_get_saddr_master(struct net *net, 1672 const struct net_device *dst_dev, 1673 const struct net_device *master, 1674 struct ipv6_saddr_dst *dst, 1675 struct ipv6_saddr_score *scores, 1676 int hiscore_idx) 1677 { 1678 struct inet6_dev *idev; 1679 1680 idev = __in6_dev_get(dst_dev); 1681 if (idev) 1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1683 scores, hiscore_idx); 1684 1685 idev = __in6_dev_get(master); 1686 if (idev) 1687 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1688 scores, hiscore_idx); 1689 1690 return hiscore_idx; 1691 } 1692 1693 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1694 const struct in6_addr *daddr, unsigned int prefs, 1695 struct in6_addr *saddr) 1696 { 1697 struct ipv6_saddr_score scores[2], *hiscore; 1698 struct ipv6_saddr_dst dst; 1699 struct inet6_dev *idev; 1700 struct net_device *dev; 1701 int dst_type; 1702 bool use_oif_addr = false; 1703 int hiscore_idx = 0; 1704 int ret = 0; 1705 1706 dst_type = __ipv6_addr_type(daddr); 1707 dst.addr = daddr; 1708 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1709 dst.scope = __ipv6_addr_src_scope(dst_type); 1710 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1711 dst.prefs = prefs; 1712 1713 scores[hiscore_idx].rule = -1; 1714 scores[hiscore_idx].ifa = NULL; 1715 1716 rcu_read_lock(); 1717 1718 /* Candidate Source Address (section 4) 1719 * - multicast and link-local destination address, 1720 * the set of candidate source address MUST only 1721 * include addresses assigned to interfaces 1722 * belonging to the same link as the outgoing 1723 * interface. 1724 * (- For site-local destination addresses, the 1725 * set of candidate source addresses MUST only 1726 * include addresses assigned to interfaces 1727 * belonging to the same site as the outgoing 1728 * interface.) 1729 * - "It is RECOMMENDED that the candidate source addresses 1730 * be the set of unicast addresses assigned to the 1731 * interface that will be used to send to the destination 1732 * (the 'outgoing' interface)." (RFC 6724) 1733 */ 1734 if (dst_dev) { 1735 idev = __in6_dev_get(dst_dev); 1736 if ((dst_type & IPV6_ADDR_MULTICAST) || 1737 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1738 (idev && idev->cnf.use_oif_addrs_only)) { 1739 use_oif_addr = true; 1740 } 1741 } 1742 1743 if (use_oif_addr) { 1744 if (idev) 1745 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1746 } else { 1747 const struct net_device *master; 1748 int master_idx = 0; 1749 1750 /* if dst_dev exists and is enslaved to an L3 device, then 1751 * prefer addresses from dst_dev and then the master over 1752 * any other enslaved devices in the L3 domain. 1753 */ 1754 master = l3mdev_master_dev_rcu(dst_dev); 1755 if (master) { 1756 master_idx = master->ifindex; 1757 1758 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1759 master, &dst, 1760 scores, hiscore_idx); 1761 1762 if (scores[hiscore_idx].ifa) 1763 goto out; 1764 } 1765 1766 for_each_netdev_rcu(net, dev) { 1767 /* only consider addresses on devices in the 1768 * same L3 domain 1769 */ 1770 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1771 continue; 1772 idev = __in6_dev_get(dev); 1773 if (!idev) 1774 continue; 1775 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1776 } 1777 } 1778 1779 out: 1780 hiscore = &scores[hiscore_idx]; 1781 if (!hiscore->ifa) 1782 ret = -EADDRNOTAVAIL; 1783 else 1784 *saddr = hiscore->ifa->addr; 1785 1786 rcu_read_unlock(); 1787 return ret; 1788 } 1789 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1790 1791 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1792 u32 banned_flags) 1793 { 1794 struct inet6_ifaddr *ifp; 1795 int err = -EADDRNOTAVAIL; 1796 1797 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1798 if (ifp->scope > IFA_LINK) 1799 break; 1800 if (ifp->scope == IFA_LINK && 1801 !(ifp->flags & banned_flags)) { 1802 *addr = ifp->addr; 1803 err = 0; 1804 break; 1805 } 1806 } 1807 return err; 1808 } 1809 1810 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1811 u32 banned_flags) 1812 { 1813 struct inet6_dev *idev; 1814 int err = -EADDRNOTAVAIL; 1815 1816 rcu_read_lock(); 1817 idev = __in6_dev_get(dev); 1818 if (idev) { 1819 read_lock_bh(&idev->lock); 1820 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1821 read_unlock_bh(&idev->lock); 1822 } 1823 rcu_read_unlock(); 1824 return err; 1825 } 1826 1827 static int ipv6_count_addresses(const struct inet6_dev *idev) 1828 { 1829 const struct inet6_ifaddr *ifp; 1830 int cnt = 0; 1831 1832 rcu_read_lock(); 1833 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1834 cnt++; 1835 rcu_read_unlock(); 1836 return cnt; 1837 } 1838 1839 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1840 const struct net_device *dev, int strict) 1841 { 1842 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1843 strict, IFA_F_TENTATIVE); 1844 } 1845 EXPORT_SYMBOL(ipv6_chk_addr); 1846 1847 /* device argument is used to find the L3 domain of interest. If 1848 * skip_dev_check is set, then the ifp device is not checked against 1849 * the passed in dev argument. So the 2 cases for addresses checks are: 1850 * 1. does the address exist in the L3 domain that dev is part of 1851 * (skip_dev_check = true), or 1852 * 1853 * 2. does the address exist on the specific device 1854 * (skip_dev_check = false) 1855 */ 1856 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1857 const struct net_device *dev, bool skip_dev_check, 1858 int strict, u32 banned_flags) 1859 { 1860 unsigned int hash = inet6_addr_hash(net, addr); 1861 const struct net_device *l3mdev; 1862 struct inet6_ifaddr *ifp; 1863 u32 ifp_flags; 1864 1865 rcu_read_lock(); 1866 1867 l3mdev = l3mdev_master_dev_rcu(dev); 1868 if (skip_dev_check) 1869 dev = NULL; 1870 1871 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1872 if (!net_eq(dev_net(ifp->idev->dev), net)) 1873 continue; 1874 1875 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1876 continue; 1877 1878 /* Decouple optimistic from tentative for evaluation here. 1879 * Ban optimistic addresses explicitly, when required. 1880 */ 1881 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1882 ? (ifp->flags&~IFA_F_TENTATIVE) 1883 : ifp->flags; 1884 if (ipv6_addr_equal(&ifp->addr, addr) && 1885 !(ifp_flags&banned_flags) && 1886 (!dev || ifp->idev->dev == dev || 1887 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1888 rcu_read_unlock(); 1889 return 1; 1890 } 1891 } 1892 1893 rcu_read_unlock(); 1894 return 0; 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1897 1898 1899 /* Compares an address/prefix_len with addresses on device @dev. 1900 * If one is found it returns true. 1901 */ 1902 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1903 const unsigned int prefix_len, struct net_device *dev) 1904 { 1905 const struct inet6_ifaddr *ifa; 1906 const struct inet6_dev *idev; 1907 bool ret = false; 1908 1909 rcu_read_lock(); 1910 idev = __in6_dev_get(dev); 1911 if (idev) { 1912 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1913 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1914 if (ret) 1915 break; 1916 } 1917 } 1918 rcu_read_unlock(); 1919 1920 return ret; 1921 } 1922 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1923 1924 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1925 { 1926 const struct inet6_ifaddr *ifa; 1927 const struct inet6_dev *idev; 1928 int onlink; 1929 1930 onlink = 0; 1931 rcu_read_lock(); 1932 idev = __in6_dev_get(dev); 1933 if (idev) { 1934 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1935 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1936 ifa->prefix_len); 1937 if (onlink) 1938 break; 1939 } 1940 } 1941 rcu_read_unlock(); 1942 return onlink; 1943 } 1944 EXPORT_SYMBOL(ipv6_chk_prefix); 1945 1946 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1947 struct net_device *dev, int strict) 1948 { 1949 unsigned int hash = inet6_addr_hash(net, addr); 1950 struct inet6_ifaddr *ifp, *result = NULL; 1951 1952 rcu_read_lock(); 1953 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1954 if (!net_eq(dev_net(ifp->idev->dev), net)) 1955 continue; 1956 if (ipv6_addr_equal(&ifp->addr, addr)) { 1957 if (!dev || ifp->idev->dev == dev || 1958 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1959 result = ifp; 1960 in6_ifa_hold(ifp); 1961 break; 1962 } 1963 } 1964 } 1965 rcu_read_unlock(); 1966 1967 return result; 1968 } 1969 1970 /* Gets referenced address, destroys ifaddr */ 1971 1972 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1973 { 1974 if (dad_failed) 1975 ifp->flags |= IFA_F_DADFAILED; 1976 1977 if (ifp->flags&IFA_F_TEMPORARY) { 1978 struct inet6_ifaddr *ifpub; 1979 spin_lock_bh(&ifp->lock); 1980 ifpub = ifp->ifpub; 1981 if (ifpub) { 1982 in6_ifa_hold(ifpub); 1983 spin_unlock_bh(&ifp->lock); 1984 ipv6_create_tempaddr(ifpub, ifp, true); 1985 in6_ifa_put(ifpub); 1986 } else { 1987 spin_unlock_bh(&ifp->lock); 1988 } 1989 ipv6_del_addr(ifp); 1990 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1991 spin_lock_bh(&ifp->lock); 1992 addrconf_del_dad_work(ifp); 1993 ifp->flags |= IFA_F_TENTATIVE; 1994 if (dad_failed) 1995 ifp->flags &= ~IFA_F_OPTIMISTIC; 1996 spin_unlock_bh(&ifp->lock); 1997 if (dad_failed) 1998 ipv6_ifa_notify(0, ifp); 1999 in6_ifa_put(ifp); 2000 } else { 2001 ipv6_del_addr(ifp); 2002 } 2003 } 2004 2005 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2006 { 2007 int err = -ENOENT; 2008 2009 spin_lock_bh(&ifp->lock); 2010 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2011 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2012 err = 0; 2013 } 2014 spin_unlock_bh(&ifp->lock); 2015 2016 return err; 2017 } 2018 2019 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2020 { 2021 struct inet6_dev *idev = ifp->idev; 2022 struct net *net = dev_net(ifp->idev->dev); 2023 2024 if (addrconf_dad_end(ifp)) { 2025 in6_ifa_put(ifp); 2026 return; 2027 } 2028 2029 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2030 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2031 2032 spin_lock_bh(&ifp->lock); 2033 2034 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2035 int scope = ifp->scope; 2036 u32 flags = ifp->flags; 2037 struct in6_addr new_addr; 2038 struct inet6_ifaddr *ifp2; 2039 u32 valid_lft, preferred_lft; 2040 int pfxlen = ifp->prefix_len; 2041 int retries = ifp->stable_privacy_retry + 1; 2042 2043 if (retries > net->ipv6.sysctl.idgen_retries) { 2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2045 ifp->idev->dev->name); 2046 goto errdad; 2047 } 2048 2049 new_addr = ifp->addr; 2050 if (ipv6_generate_stable_address(&new_addr, retries, 2051 idev)) 2052 goto errdad; 2053 2054 valid_lft = ifp->valid_lft; 2055 preferred_lft = ifp->prefered_lft; 2056 2057 spin_unlock_bh(&ifp->lock); 2058 2059 if (idev->cnf.max_addresses && 2060 ipv6_count_addresses(idev) >= 2061 idev->cnf.max_addresses) 2062 goto lock_errdad; 2063 2064 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2065 ifp->idev->dev->name); 2066 2067 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2068 scope, flags, valid_lft, 2069 preferred_lft, false, NULL); 2070 if (IS_ERR(ifp2)) 2071 goto lock_errdad; 2072 2073 spin_lock_bh(&ifp2->lock); 2074 ifp2->stable_privacy_retry = retries; 2075 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2076 spin_unlock_bh(&ifp2->lock); 2077 2078 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2079 in6_ifa_put(ifp2); 2080 lock_errdad: 2081 spin_lock_bh(&ifp->lock); 2082 } 2083 2084 errdad: 2085 /* transition from _POSTDAD to _ERRDAD */ 2086 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2087 spin_unlock_bh(&ifp->lock); 2088 2089 addrconf_mod_dad_work(ifp, 0); 2090 in6_ifa_put(ifp); 2091 } 2092 2093 /* Join to solicited addr multicast group. 2094 * caller must hold RTNL */ 2095 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2096 { 2097 struct in6_addr maddr; 2098 2099 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2100 return; 2101 2102 addrconf_addr_solict_mult(addr, &maddr); 2103 ipv6_dev_mc_inc(dev, &maddr); 2104 } 2105 2106 /* caller must hold RTNL */ 2107 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2108 { 2109 struct in6_addr maddr; 2110 2111 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2112 return; 2113 2114 addrconf_addr_solict_mult(addr, &maddr); 2115 __ipv6_dev_mc_dec(idev, &maddr); 2116 } 2117 2118 /* caller must hold RTNL */ 2119 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2120 { 2121 struct in6_addr addr; 2122 2123 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2124 return; 2125 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2126 if (ipv6_addr_any(&addr)) 2127 return; 2128 __ipv6_dev_ac_inc(ifp->idev, &addr); 2129 } 2130 2131 /* caller must hold RTNL */ 2132 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2133 { 2134 struct in6_addr addr; 2135 2136 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2137 return; 2138 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2139 if (ipv6_addr_any(&addr)) 2140 return; 2141 __ipv6_dev_ac_dec(ifp->idev, &addr); 2142 } 2143 2144 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2145 { 2146 switch (dev->addr_len) { 2147 case ETH_ALEN: 2148 memcpy(eui, dev->dev_addr, 3); 2149 eui[3] = 0xFF; 2150 eui[4] = 0xFE; 2151 memcpy(eui + 5, dev->dev_addr + 3, 3); 2152 break; 2153 case EUI64_ADDR_LEN: 2154 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2155 eui[0] ^= 2; 2156 break; 2157 default: 2158 return -1; 2159 } 2160 2161 return 0; 2162 } 2163 2164 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2165 { 2166 union fwnet_hwaddr *ha; 2167 2168 if (dev->addr_len != FWNET_ALEN) 2169 return -1; 2170 2171 ha = (union fwnet_hwaddr *)dev->dev_addr; 2172 2173 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2174 eui[0] ^= 2; 2175 return 0; 2176 } 2177 2178 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2179 { 2180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2181 if (dev->addr_len != ARCNET_ALEN) 2182 return -1; 2183 memset(eui, 0, 7); 2184 eui[7] = *(u8 *)dev->dev_addr; 2185 return 0; 2186 } 2187 2188 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2189 { 2190 if (dev->addr_len != INFINIBAND_ALEN) 2191 return -1; 2192 memcpy(eui, dev->dev_addr + 12, 8); 2193 eui[0] |= 2; 2194 return 0; 2195 } 2196 2197 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2198 { 2199 if (addr == 0) 2200 return -1; 2201 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2202 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2203 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2204 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2205 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2206 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2207 eui[1] = 0; 2208 eui[2] = 0x5E; 2209 eui[3] = 0xFE; 2210 memcpy(eui + 4, &addr, 4); 2211 return 0; 2212 } 2213 2214 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2215 { 2216 if (dev->priv_flags & IFF_ISATAP) 2217 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2218 return -1; 2219 } 2220 2221 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2222 { 2223 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2224 } 2225 2226 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2227 { 2228 memcpy(eui, dev->perm_addr, 3); 2229 memcpy(eui + 5, dev->perm_addr + 3, 3); 2230 eui[3] = 0xFF; 2231 eui[4] = 0xFE; 2232 eui[0] ^= 2; 2233 return 0; 2234 } 2235 2236 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2237 { 2238 switch (dev->type) { 2239 case ARPHRD_ETHER: 2240 case ARPHRD_FDDI: 2241 return addrconf_ifid_eui48(eui, dev); 2242 case ARPHRD_ARCNET: 2243 return addrconf_ifid_arcnet(eui, dev); 2244 case ARPHRD_INFINIBAND: 2245 return addrconf_ifid_infiniband(eui, dev); 2246 case ARPHRD_SIT: 2247 return addrconf_ifid_sit(eui, dev); 2248 case ARPHRD_IPGRE: 2249 case ARPHRD_TUNNEL: 2250 return addrconf_ifid_gre(eui, dev); 2251 case ARPHRD_6LOWPAN: 2252 return addrconf_ifid_6lowpan(eui, dev); 2253 case ARPHRD_IEEE1394: 2254 return addrconf_ifid_ieee1394(eui, dev); 2255 case ARPHRD_TUNNEL6: 2256 case ARPHRD_IP6GRE: 2257 return addrconf_ifid_ip6tnl(eui, dev); 2258 } 2259 return -1; 2260 } 2261 2262 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2263 { 2264 int err = -1; 2265 struct inet6_ifaddr *ifp; 2266 2267 read_lock_bh(&idev->lock); 2268 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2269 if (ifp->scope > IFA_LINK) 2270 break; 2271 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2272 memcpy(eui, ifp->addr.s6_addr+8, 8); 2273 err = 0; 2274 break; 2275 } 2276 } 2277 read_unlock_bh(&idev->lock); 2278 return err; 2279 } 2280 2281 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2282 static void ipv6_regen_rndid(struct inet6_dev *idev) 2283 { 2284 regen: 2285 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2286 idev->rndid[0] &= ~0x02; 2287 2288 /* 2289 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2290 * check if generated address is not inappropriate 2291 * 2292 * - Reserved subnet anycast (RFC 2526) 2293 * 11111101 11....11 1xxxxxxx 2294 * - ISATAP (RFC4214) 6.1 2295 * 00-00-5E-FE-xx-xx-xx-xx 2296 * - value 0 2297 * - XXX: already assigned to an address on the device 2298 */ 2299 if (idev->rndid[0] == 0xfd && 2300 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2301 (idev->rndid[7]&0x80)) 2302 goto regen; 2303 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2304 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2305 goto regen; 2306 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2307 goto regen; 2308 } 2309 } 2310 2311 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2312 { 2313 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2314 ipv6_regen_rndid(idev); 2315 } 2316 2317 /* 2318 * Add prefix route. 2319 */ 2320 2321 static void 2322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2323 unsigned long expires, u32 flags) 2324 { 2325 struct fib6_config cfg = { 2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2327 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2328 .fc_ifindex = dev->ifindex, 2329 .fc_expires = expires, 2330 .fc_dst_len = plen, 2331 .fc_flags = RTF_UP | flags, 2332 .fc_nlinfo.nl_net = dev_net(dev), 2333 .fc_protocol = RTPROT_KERNEL, 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, NULL); 2348 } 2349 2350 2351 static struct rt6_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 rt6_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->dst.dev->ifindex != dev->ifindex) 2372 continue; 2373 if ((rt->rt6i_flags & flags) != flags) 2374 continue; 2375 if ((rt->rt6i_flags & noflags) != 0) 2376 continue; 2377 if (!dst_hold_safe(&rt->dst)) 2378 rt = NULL; 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_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2512 if ((net->ipv6.devconf_all->optimistic_dad || 2513 in6_dev->cnf.optimistic_dad) && 2514 !net->ipv6.devconf_all->forwarding && sllao) 2515 addr_flags |= IFA_F_OPTIMISTIC; 2516 #endif 2517 2518 /* Do not allow to create too much of autoconfigured 2519 * addresses; this would be too easy way to crash kernel. 2520 */ 2521 if (!max_addresses || 2522 ipv6_count_addresses(in6_dev) < max_addresses) 2523 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2524 pinfo->prefix_len, 2525 addr_type&IPV6_ADDR_SCOPE_MASK, 2526 addr_flags, valid_lft, 2527 prefered_lft, false, NULL); 2528 2529 if (IS_ERR_OR_NULL(ifp)) 2530 return -1; 2531 2532 create = 1; 2533 spin_lock_bh(&ifp->lock); 2534 ifp->flags |= IFA_F_MANAGETEMPADDR; 2535 ifp->cstamp = jiffies; 2536 ifp->tokenized = tokenized; 2537 spin_unlock_bh(&ifp->lock); 2538 addrconf_dad_start(ifp); 2539 } 2540 2541 if (ifp) { 2542 u32 flags; 2543 unsigned long now; 2544 u32 stored_lft; 2545 2546 /* update lifetime (RFC2462 5.5.3 e) */ 2547 spin_lock_bh(&ifp->lock); 2548 now = jiffies; 2549 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2550 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2551 else 2552 stored_lft = 0; 2553 if (!create && stored_lft) { 2554 const u32 minimum_lft = min_t(u32, 2555 stored_lft, MIN_VALID_LIFETIME); 2556 valid_lft = max(valid_lft, minimum_lft); 2557 2558 /* RFC4862 Section 5.5.3e: 2559 * "Note that the preferred lifetime of the 2560 * corresponding address is always reset to 2561 * the Preferred Lifetime in the received 2562 * Prefix Information option, regardless of 2563 * whether the valid lifetime is also reset or 2564 * ignored." 2565 * 2566 * So we should always update prefered_lft here. 2567 */ 2568 update_lft = 1; 2569 } 2570 2571 if (update_lft) { 2572 ifp->valid_lft = valid_lft; 2573 ifp->prefered_lft = prefered_lft; 2574 ifp->tstamp = now; 2575 flags = ifp->flags; 2576 ifp->flags &= ~IFA_F_DEPRECATED; 2577 spin_unlock_bh(&ifp->lock); 2578 2579 if (!(flags&IFA_F_TENTATIVE)) 2580 ipv6_ifa_notify(0, ifp); 2581 } else 2582 spin_unlock_bh(&ifp->lock); 2583 2584 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2585 create, now); 2586 2587 in6_ifa_put(ifp); 2588 addrconf_verify(); 2589 } 2590 2591 return 0; 2592 } 2593 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2594 2595 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2596 { 2597 struct prefix_info *pinfo; 2598 __u32 valid_lft; 2599 __u32 prefered_lft; 2600 int addr_type, err; 2601 u32 addr_flags = 0; 2602 struct inet6_dev *in6_dev; 2603 struct net *net = dev_net(dev); 2604 2605 pinfo = (struct prefix_info *) opt; 2606 2607 if (len < sizeof(struct prefix_info)) { 2608 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2609 return; 2610 } 2611 2612 /* 2613 * Validation checks ([ADDRCONF], page 19) 2614 */ 2615 2616 addr_type = ipv6_addr_type(&pinfo->prefix); 2617 2618 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2619 return; 2620 2621 valid_lft = ntohl(pinfo->valid); 2622 prefered_lft = ntohl(pinfo->prefered); 2623 2624 if (prefered_lft > valid_lft) { 2625 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2626 return; 2627 } 2628 2629 in6_dev = in6_dev_get(dev); 2630 2631 if (!in6_dev) { 2632 net_dbg_ratelimited("addrconf: device %s not configured\n", 2633 dev->name); 2634 return; 2635 } 2636 2637 /* 2638 * Two things going on here: 2639 * 1) Add routes for on-link prefixes 2640 * 2) Configure prefixes with the auto flag set 2641 */ 2642 2643 if (pinfo->onlink) { 2644 struct rt6_info *rt; 2645 unsigned long rt_expires; 2646 2647 /* Avoid arithmetic overflow. Really, we could 2648 * save rt_expires in seconds, likely valid_lft, 2649 * but it would require division in fib gc, that it 2650 * not good. 2651 */ 2652 if (HZ > USER_HZ) 2653 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2654 else 2655 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2656 2657 if (addrconf_finite_timeout(rt_expires)) 2658 rt_expires *= HZ; 2659 2660 rt = addrconf_get_prefix_route(&pinfo->prefix, 2661 pinfo->prefix_len, 2662 dev, 2663 RTF_ADDRCONF | RTF_PREFIX_RT, 2664 RTF_GATEWAY | RTF_DEFAULT); 2665 2666 if (rt) { 2667 /* Autoconf prefix route */ 2668 if (valid_lft == 0) { 2669 ip6_del_rt(rt); 2670 rt = NULL; 2671 } else if (addrconf_finite_timeout(rt_expires)) { 2672 /* not infinity */ 2673 rt6_set_expires(rt, jiffies + rt_expires); 2674 } else { 2675 rt6_clean_expires(rt); 2676 } 2677 } else if (valid_lft) { 2678 clock_t expires = 0; 2679 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2680 if (addrconf_finite_timeout(rt_expires)) { 2681 /* not infinity */ 2682 flags |= RTF_EXPIRES; 2683 expires = jiffies_to_clock_t(rt_expires); 2684 } 2685 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2686 dev, expires, flags); 2687 } 2688 ip6_rt_put(rt); 2689 } 2690 2691 /* Try to figure out our local address for this prefix */ 2692 2693 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2694 struct in6_addr addr; 2695 bool tokenized = false, dev_addr_generated = false; 2696 2697 if (pinfo->prefix_len == 64) { 2698 memcpy(&addr, &pinfo->prefix, 8); 2699 2700 if (!ipv6_addr_any(&in6_dev->token)) { 2701 read_lock_bh(&in6_dev->lock); 2702 memcpy(addr.s6_addr + 8, 2703 in6_dev->token.s6_addr + 8, 8); 2704 read_unlock_bh(&in6_dev->lock); 2705 tokenized = true; 2706 } else if (is_addr_mode_generate_stable(in6_dev) && 2707 !ipv6_generate_stable_address(&addr, 0, 2708 in6_dev)) { 2709 addr_flags |= IFA_F_STABLE_PRIVACY; 2710 goto ok; 2711 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2712 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2713 goto put; 2714 } else { 2715 dev_addr_generated = true; 2716 } 2717 goto ok; 2718 } 2719 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2720 pinfo->prefix_len); 2721 goto put; 2722 2723 ok: 2724 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2725 &addr, addr_type, 2726 addr_flags, sllao, 2727 tokenized, valid_lft, 2728 prefered_lft); 2729 if (err) 2730 goto put; 2731 2732 /* Ignore error case here because previous prefix add addr was 2733 * successful which will be notified. 2734 */ 2735 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2736 addr_type, addr_flags, sllao, 2737 tokenized, valid_lft, 2738 prefered_lft, 2739 dev_addr_generated); 2740 } 2741 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2742 put: 2743 in6_dev_put(in6_dev); 2744 } 2745 2746 /* 2747 * Set destination address. 2748 * Special case for SIT interfaces where we create a new "virtual" 2749 * device. 2750 */ 2751 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2752 { 2753 struct in6_ifreq ireq; 2754 struct net_device *dev; 2755 int err = -EINVAL; 2756 2757 rtnl_lock(); 2758 2759 err = -EFAULT; 2760 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2761 goto err_exit; 2762 2763 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2764 2765 err = -ENODEV; 2766 if (!dev) 2767 goto err_exit; 2768 2769 #if IS_ENABLED(CONFIG_IPV6_SIT) 2770 if (dev->type == ARPHRD_SIT) { 2771 const struct net_device_ops *ops = dev->netdev_ops; 2772 struct ifreq ifr; 2773 struct ip_tunnel_parm p; 2774 2775 err = -EADDRNOTAVAIL; 2776 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2777 goto err_exit; 2778 2779 memset(&p, 0, sizeof(p)); 2780 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2781 p.iph.saddr = 0; 2782 p.iph.version = 4; 2783 p.iph.ihl = 5; 2784 p.iph.protocol = IPPROTO_IPV6; 2785 p.iph.ttl = 64; 2786 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2787 2788 if (ops->ndo_do_ioctl) { 2789 mm_segment_t oldfs = get_fs(); 2790 2791 set_fs(KERNEL_DS); 2792 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2793 set_fs(oldfs); 2794 } else 2795 err = -EOPNOTSUPP; 2796 2797 if (err == 0) { 2798 err = -ENOBUFS; 2799 dev = __dev_get_by_name(net, p.name); 2800 if (!dev) 2801 goto err_exit; 2802 err = dev_open(dev); 2803 } 2804 } 2805 #endif 2806 2807 err_exit: 2808 rtnl_unlock(); 2809 return err; 2810 } 2811 2812 static int ipv6_mc_config(struct sock *sk, bool join, 2813 const struct in6_addr *addr, int ifindex) 2814 { 2815 int ret; 2816 2817 ASSERT_RTNL(); 2818 2819 lock_sock(sk); 2820 if (join) 2821 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2822 else 2823 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2824 release_sock(sk); 2825 2826 return ret; 2827 } 2828 2829 /* 2830 * Manual configuration of address on an interface 2831 */ 2832 static int inet6_addr_add(struct net *net, int ifindex, 2833 const struct in6_addr *pfx, 2834 const struct in6_addr *peer_pfx, 2835 unsigned int plen, __u32 ifa_flags, 2836 __u32 prefered_lft, __u32 valid_lft, 2837 struct netlink_ext_ack *extack) 2838 { 2839 struct inet6_ifaddr *ifp; 2840 struct inet6_dev *idev; 2841 struct net_device *dev; 2842 unsigned long timeout; 2843 clock_t expires; 2844 int scope; 2845 u32 flags; 2846 2847 ASSERT_RTNL(); 2848 2849 if (plen > 128) 2850 return -EINVAL; 2851 2852 /* check the lifetime */ 2853 if (!valid_lft || prefered_lft > valid_lft) 2854 return -EINVAL; 2855 2856 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2857 return -EINVAL; 2858 2859 dev = __dev_get_by_index(net, ifindex); 2860 if (!dev) 2861 return -ENODEV; 2862 2863 idev = addrconf_add_dev(dev); 2864 if (IS_ERR(idev)) 2865 return PTR_ERR(idev); 2866 2867 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2869 true, pfx, ifindex); 2870 2871 if (ret < 0) 2872 return ret; 2873 } 2874 2875 scope = ipv6_addr_scope(pfx); 2876 2877 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2878 if (addrconf_finite_timeout(timeout)) { 2879 expires = jiffies_to_clock_t(timeout * HZ); 2880 valid_lft = timeout; 2881 flags = RTF_EXPIRES; 2882 } else { 2883 expires = 0; 2884 flags = 0; 2885 ifa_flags |= IFA_F_PERMANENT; 2886 } 2887 2888 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2889 if (addrconf_finite_timeout(timeout)) { 2890 if (timeout == 0) 2891 ifa_flags |= IFA_F_DEPRECATED; 2892 prefered_lft = timeout; 2893 } 2894 2895 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2896 valid_lft, prefered_lft, true, extack); 2897 2898 if (!IS_ERR(ifp)) { 2899 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2900 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2901 expires, flags); 2902 } 2903 2904 /* Send a netlink notification if DAD is enabled and 2905 * optimistic flag is not set 2906 */ 2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2908 ipv6_ifa_notify(0, ifp); 2909 /* 2910 * Note that section 3.1 of RFC 4429 indicates 2911 * that the Optimistic flag should not be set for 2912 * manually configured addresses 2913 */ 2914 addrconf_dad_start(ifp); 2915 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2916 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2917 true, jiffies); 2918 in6_ifa_put(ifp); 2919 addrconf_verify_rtnl(); 2920 return 0; 2921 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2923 false, pfx, ifindex); 2924 } 2925 2926 return PTR_ERR(ifp); 2927 } 2928 2929 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2930 const struct in6_addr *pfx, unsigned int plen) 2931 { 2932 struct inet6_ifaddr *ifp; 2933 struct inet6_dev *idev; 2934 struct net_device *dev; 2935 2936 if (plen > 128) 2937 return -EINVAL; 2938 2939 dev = __dev_get_by_index(net, ifindex); 2940 if (!dev) 2941 return -ENODEV; 2942 2943 idev = __in6_dev_get(dev); 2944 if (!idev) 2945 return -ENXIO; 2946 2947 read_lock_bh(&idev->lock); 2948 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2949 if (ifp->prefix_len == plen && 2950 ipv6_addr_equal(pfx, &ifp->addr)) { 2951 in6_ifa_hold(ifp); 2952 read_unlock_bh(&idev->lock); 2953 2954 if (!(ifp->flags & IFA_F_TEMPORARY) && 2955 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2956 manage_tempaddrs(idev, ifp, 0, 0, false, 2957 jiffies); 2958 ipv6_del_addr(ifp); 2959 addrconf_verify_rtnl(); 2960 if (ipv6_addr_is_multicast(pfx)) { 2961 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2962 false, pfx, dev->ifindex); 2963 } 2964 return 0; 2965 } 2966 } 2967 read_unlock_bh(&idev->lock); 2968 return -EADDRNOTAVAIL; 2969 } 2970 2971 2972 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2973 { 2974 struct in6_ifreq ireq; 2975 int err; 2976 2977 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2978 return -EPERM; 2979 2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2981 return -EFAULT; 2982 2983 rtnl_lock(); 2984 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2985 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2986 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2987 rtnl_unlock(); 2988 return err; 2989 } 2990 2991 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2992 { 2993 struct in6_ifreq ireq; 2994 int err; 2995 2996 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2997 return -EPERM; 2998 2999 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3000 return -EFAULT; 3001 3002 rtnl_lock(); 3003 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3004 ireq.ifr6_prefixlen); 3005 rtnl_unlock(); 3006 return err; 3007 } 3008 3009 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3010 int plen, int scope) 3011 { 3012 struct inet6_ifaddr *ifp; 3013 3014 ifp = ipv6_add_addr(idev, addr, NULL, plen, 3015 scope, IFA_F_PERMANENT, 3016 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 3017 true, NULL); 3018 if (!IS_ERR(ifp)) { 3019 spin_lock_bh(&ifp->lock); 3020 ifp->flags &= ~IFA_F_TENTATIVE; 3021 spin_unlock_bh(&ifp->lock); 3022 rt_genid_bump_ipv6(dev_net(idev->dev)); 3023 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3024 in6_ifa_put(ifp); 3025 } 3026 } 3027 3028 #if IS_ENABLED(CONFIG_IPV6_SIT) 3029 static void sit_add_v4_addrs(struct inet6_dev *idev) 3030 { 3031 struct in6_addr addr; 3032 struct net_device *dev; 3033 struct net *net = dev_net(idev->dev); 3034 int scope, plen; 3035 u32 pflags = 0; 3036 3037 ASSERT_RTNL(); 3038 3039 memset(&addr, 0, sizeof(struct in6_addr)); 3040 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3041 3042 if (idev->dev->flags&IFF_POINTOPOINT) { 3043 addr.s6_addr32[0] = htonl(0xfe800000); 3044 scope = IFA_LINK; 3045 plen = 64; 3046 } else { 3047 scope = IPV6_ADDR_COMPATv4; 3048 plen = 96; 3049 pflags |= RTF_NONEXTHOP; 3050 } 3051 3052 if (addr.s6_addr32[3]) { 3053 add_addr(idev, &addr, plen, scope); 3054 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3055 return; 3056 } 3057 3058 for_each_netdev(net, dev) { 3059 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3060 if (in_dev && (dev->flags & IFF_UP)) { 3061 struct in_ifaddr *ifa; 3062 3063 int flag = scope; 3064 3065 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3066 3067 addr.s6_addr32[3] = ifa->ifa_local; 3068 3069 if (ifa->ifa_scope == RT_SCOPE_LINK) 3070 continue; 3071 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3072 if (idev->dev->flags&IFF_POINTOPOINT) 3073 continue; 3074 flag |= IFA_HOST; 3075 } 3076 3077 add_addr(idev, &addr, plen, flag); 3078 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3079 pflags); 3080 } 3081 } 3082 } 3083 } 3084 #endif 3085 3086 static void init_loopback(struct net_device *dev) 3087 { 3088 struct inet6_dev *idev; 3089 3090 /* ::1 */ 3091 3092 ASSERT_RTNL(); 3093 3094 idev = ipv6_find_idev(dev); 3095 if (!idev) { 3096 pr_debug("%s: add_dev failed\n", __func__); 3097 return; 3098 } 3099 3100 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3101 } 3102 3103 void addrconf_add_linklocal(struct inet6_dev *idev, 3104 const struct in6_addr *addr, u32 flags) 3105 { 3106 struct inet6_ifaddr *ifp; 3107 u32 addr_flags = flags | IFA_F_PERMANENT; 3108 3109 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3110 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3111 idev->cnf.optimistic_dad) && 3112 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3113 addr_flags |= IFA_F_OPTIMISTIC; 3114 #endif 3115 3116 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3117 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3118 if (!IS_ERR(ifp)) { 3119 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3120 addrconf_dad_start(ifp); 3121 in6_ifa_put(ifp); 3122 } 3123 } 3124 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3125 3126 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3127 { 3128 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3129 return true; 3130 3131 if (address.s6_addr32[2] == htonl(0x02005eff) && 3132 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3133 return true; 3134 3135 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3136 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3137 return true; 3138 3139 return false; 3140 } 3141 3142 static int ipv6_generate_stable_address(struct in6_addr *address, 3143 u8 dad_count, 3144 const struct inet6_dev *idev) 3145 { 3146 static DEFINE_SPINLOCK(lock); 3147 static __u32 digest[SHA_DIGEST_WORDS]; 3148 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3149 3150 static union { 3151 char __data[SHA_MESSAGE_BYTES]; 3152 struct { 3153 struct in6_addr secret; 3154 __be32 prefix[2]; 3155 unsigned char hwaddr[MAX_ADDR_LEN]; 3156 u8 dad_count; 3157 } __packed; 3158 } data; 3159 3160 struct in6_addr secret; 3161 struct in6_addr temp; 3162 struct net *net = dev_net(idev->dev); 3163 3164 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3165 3166 if (idev->cnf.stable_secret.initialized) 3167 secret = idev->cnf.stable_secret.secret; 3168 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3169 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3170 else 3171 return -1; 3172 3173 retry: 3174 spin_lock_bh(&lock); 3175 3176 sha_init(digest); 3177 memset(&data, 0, sizeof(data)); 3178 memset(workspace, 0, sizeof(workspace)); 3179 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3180 data.prefix[0] = address->s6_addr32[0]; 3181 data.prefix[1] = address->s6_addr32[1]; 3182 data.secret = secret; 3183 data.dad_count = dad_count; 3184 3185 sha_transform(digest, data.__data, workspace); 3186 3187 temp = *address; 3188 temp.s6_addr32[2] = (__force __be32)digest[0]; 3189 temp.s6_addr32[3] = (__force __be32)digest[1]; 3190 3191 spin_unlock_bh(&lock); 3192 3193 if (ipv6_reserved_interfaceid(temp)) { 3194 dad_count++; 3195 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3196 return -1; 3197 goto retry; 3198 } 3199 3200 *address = temp; 3201 return 0; 3202 } 3203 3204 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3205 { 3206 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3207 3208 if (s->initialized) 3209 return; 3210 s = &idev->cnf.stable_secret; 3211 get_random_bytes(&s->secret, sizeof(s->secret)); 3212 s->initialized = true; 3213 } 3214 3215 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3216 { 3217 struct in6_addr addr; 3218 3219 /* no link local addresses on L3 master devices */ 3220 if (netif_is_l3_master(idev->dev)) 3221 return; 3222 3223 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3224 3225 switch (idev->cnf.addr_gen_mode) { 3226 case IN6_ADDR_GEN_MODE_RANDOM: 3227 ipv6_gen_mode_random_init(idev); 3228 /* fallthrough */ 3229 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3230 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3231 addrconf_add_linklocal(idev, &addr, 3232 IFA_F_STABLE_PRIVACY); 3233 else if (prefix_route) 3234 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3235 break; 3236 case IN6_ADDR_GEN_MODE_EUI64: 3237 /* addrconf_add_linklocal also adds a prefix_route and we 3238 * only need to care about prefix routes if ipv6_generate_eui64 3239 * couldn't generate one. 3240 */ 3241 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3242 addrconf_add_linklocal(idev, &addr, 0); 3243 else if (prefix_route) 3244 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3245 break; 3246 case IN6_ADDR_GEN_MODE_NONE: 3247 default: 3248 /* will not add any link local address */ 3249 break; 3250 } 3251 } 3252 3253 static void addrconf_dev_config(struct net_device *dev) 3254 { 3255 struct inet6_dev *idev; 3256 3257 ASSERT_RTNL(); 3258 3259 if ((dev->type != ARPHRD_ETHER) && 3260 (dev->type != ARPHRD_FDDI) && 3261 (dev->type != ARPHRD_ARCNET) && 3262 (dev->type != ARPHRD_INFINIBAND) && 3263 (dev->type != ARPHRD_IEEE1394) && 3264 (dev->type != ARPHRD_TUNNEL6) && 3265 (dev->type != ARPHRD_6LOWPAN) && 3266 (dev->type != ARPHRD_IP6GRE) && 3267 (dev->type != ARPHRD_IPGRE) && 3268 (dev->type != ARPHRD_TUNNEL) && 3269 (dev->type != ARPHRD_NONE)) { 3270 /* Alas, we support only Ethernet autoconfiguration. */ 3271 return; 3272 } 3273 3274 idev = addrconf_add_dev(dev); 3275 if (IS_ERR(idev)) 3276 return; 3277 3278 /* this device type has no EUI support */ 3279 if (dev->type == ARPHRD_NONE && 3280 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3281 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3282 3283 addrconf_addr_gen(idev, false); 3284 } 3285 3286 #if IS_ENABLED(CONFIG_IPV6_SIT) 3287 static void addrconf_sit_config(struct net_device *dev) 3288 { 3289 struct inet6_dev *idev; 3290 3291 ASSERT_RTNL(); 3292 3293 /* 3294 * Configure the tunnel with one of our IPv4 3295 * addresses... we should configure all of 3296 * our v4 addrs in the tunnel 3297 */ 3298 3299 idev = ipv6_find_idev(dev); 3300 if (!idev) { 3301 pr_debug("%s: add_dev failed\n", __func__); 3302 return; 3303 } 3304 3305 if (dev->priv_flags & IFF_ISATAP) { 3306 addrconf_addr_gen(idev, false); 3307 return; 3308 } 3309 3310 sit_add_v4_addrs(idev); 3311 3312 if (dev->flags&IFF_POINTOPOINT) 3313 addrconf_add_mroute(dev); 3314 } 3315 #endif 3316 3317 #if IS_ENABLED(CONFIG_NET_IPGRE) 3318 static void addrconf_gre_config(struct net_device *dev) 3319 { 3320 struct inet6_dev *idev; 3321 3322 ASSERT_RTNL(); 3323 3324 idev = ipv6_find_idev(dev); 3325 if (!idev) { 3326 pr_debug("%s: add_dev failed\n", __func__); 3327 return; 3328 } 3329 3330 addrconf_addr_gen(idev, true); 3331 if (dev->flags & IFF_POINTOPOINT) 3332 addrconf_add_mroute(dev); 3333 } 3334 #endif 3335 3336 static int fixup_permanent_addr(struct inet6_dev *idev, 3337 struct inet6_ifaddr *ifp) 3338 { 3339 /* !rt6i_node means the host route was removed from the 3340 * FIB, for example, if 'lo' device is taken down. In that 3341 * case regenerate the host route. 3342 */ 3343 if (!ifp->rt || !ifp->rt->rt6i_node) { 3344 struct rt6_info *rt, *prev; 3345 3346 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3347 if (IS_ERR(rt)) 3348 return PTR_ERR(rt); 3349 3350 /* ifp->rt can be accessed outside of rtnl */ 3351 spin_lock(&ifp->lock); 3352 prev = ifp->rt; 3353 ifp->rt = rt; 3354 spin_unlock(&ifp->lock); 3355 3356 ip6_rt_put(prev); 3357 } 3358 3359 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3360 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3361 idev->dev, 0, 0); 3362 } 3363 3364 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3365 addrconf_dad_start(ifp); 3366 3367 return 0; 3368 } 3369 3370 static void addrconf_permanent_addr(struct net_device *dev) 3371 { 3372 struct inet6_ifaddr *ifp, *tmp; 3373 struct inet6_dev *idev; 3374 3375 idev = __in6_dev_get(dev); 3376 if (!idev) 3377 return; 3378 3379 write_lock_bh(&idev->lock); 3380 3381 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3382 if ((ifp->flags & IFA_F_PERMANENT) && 3383 fixup_permanent_addr(idev, ifp) < 0) { 3384 write_unlock_bh(&idev->lock); 3385 in6_ifa_hold(ifp); 3386 ipv6_del_addr(ifp); 3387 write_lock_bh(&idev->lock); 3388 3389 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3390 idev->dev->name, &ifp->addr); 3391 } 3392 } 3393 3394 write_unlock_bh(&idev->lock); 3395 } 3396 3397 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3398 void *ptr) 3399 { 3400 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3401 struct netdev_notifier_changeupper_info *info; 3402 struct inet6_dev *idev = __in6_dev_get(dev); 3403 struct net *net = dev_net(dev); 3404 int run_pending = 0; 3405 int err; 3406 3407 switch (event) { 3408 case NETDEV_REGISTER: 3409 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3410 idev = ipv6_add_dev(dev); 3411 if (IS_ERR(idev)) 3412 return notifier_from_errno(PTR_ERR(idev)); 3413 } 3414 break; 3415 3416 case NETDEV_CHANGEMTU: 3417 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3418 if (dev->mtu < IPV6_MIN_MTU) { 3419 addrconf_ifdown(dev, dev != net->loopback_dev); 3420 break; 3421 } 3422 3423 if (idev) { 3424 rt6_mtu_change(dev, dev->mtu); 3425 idev->cnf.mtu6 = dev->mtu; 3426 break; 3427 } 3428 3429 /* allocate new idev */ 3430 idev = ipv6_add_dev(dev); 3431 if (IS_ERR(idev)) 3432 break; 3433 3434 /* device is still not ready */ 3435 if (!(idev->if_flags & IF_READY)) 3436 break; 3437 3438 run_pending = 1; 3439 3440 /* fall through */ 3441 3442 case NETDEV_UP: 3443 case NETDEV_CHANGE: 3444 if (dev->flags & IFF_SLAVE) 3445 break; 3446 3447 if (idev && idev->cnf.disable_ipv6) 3448 break; 3449 3450 if (event == NETDEV_UP) { 3451 /* restore routes for permanent addresses */ 3452 addrconf_permanent_addr(dev); 3453 3454 if (!addrconf_link_ready(dev)) { 3455 /* device is not ready yet. */ 3456 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3457 dev->name); 3458 break; 3459 } 3460 3461 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3462 idev = ipv6_add_dev(dev); 3463 3464 if (!IS_ERR_OR_NULL(idev)) { 3465 idev->if_flags |= IF_READY; 3466 run_pending = 1; 3467 } 3468 } else if (event == NETDEV_CHANGE) { 3469 if (!addrconf_link_ready(dev)) { 3470 /* device is still not ready. */ 3471 rt6_sync_down_dev(dev, event); 3472 break; 3473 } 3474 3475 if (idev) { 3476 if (idev->if_flags & IF_READY) { 3477 /* device is already configured - 3478 * but resend MLD reports, we might 3479 * have roamed and need to update 3480 * multicast snooping switches 3481 */ 3482 ipv6_mc_up(idev); 3483 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3484 break; 3485 } 3486 idev->if_flags |= IF_READY; 3487 } 3488 3489 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3490 dev->name); 3491 3492 run_pending = 1; 3493 } 3494 3495 switch (dev->type) { 3496 #if IS_ENABLED(CONFIG_IPV6_SIT) 3497 case ARPHRD_SIT: 3498 addrconf_sit_config(dev); 3499 break; 3500 #endif 3501 #if IS_ENABLED(CONFIG_NET_IPGRE) 3502 case ARPHRD_IPGRE: 3503 addrconf_gre_config(dev); 3504 break; 3505 #endif 3506 case ARPHRD_LOOPBACK: 3507 init_loopback(dev); 3508 break; 3509 3510 default: 3511 addrconf_dev_config(dev); 3512 break; 3513 } 3514 3515 if (!IS_ERR_OR_NULL(idev)) { 3516 if (run_pending) 3517 addrconf_dad_run(idev); 3518 3519 /* Device has an address by now */ 3520 rt6_sync_up(dev, RTNH_F_DEAD); 3521 3522 /* 3523 * If the MTU changed during the interface down, 3524 * when the interface up, the changed MTU must be 3525 * reflected in the idev as well as routers. 3526 */ 3527 if (idev->cnf.mtu6 != dev->mtu && 3528 dev->mtu >= IPV6_MIN_MTU) { 3529 rt6_mtu_change(dev, dev->mtu); 3530 idev->cnf.mtu6 = dev->mtu; 3531 } 3532 idev->tstamp = jiffies; 3533 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3534 3535 /* 3536 * If the changed mtu during down is lower than 3537 * IPV6_MIN_MTU stop IPv6 on this interface. 3538 */ 3539 if (dev->mtu < IPV6_MIN_MTU) 3540 addrconf_ifdown(dev, dev != net->loopback_dev); 3541 } 3542 break; 3543 3544 case NETDEV_DOWN: 3545 case NETDEV_UNREGISTER: 3546 /* 3547 * Remove all addresses from this interface. 3548 */ 3549 addrconf_ifdown(dev, event != NETDEV_DOWN); 3550 break; 3551 3552 case NETDEV_CHANGENAME: 3553 if (idev) { 3554 snmp6_unregister_dev(idev); 3555 addrconf_sysctl_unregister(idev); 3556 err = addrconf_sysctl_register(idev); 3557 if (err) 3558 return notifier_from_errno(err); 3559 err = snmp6_register_dev(idev); 3560 if (err) { 3561 addrconf_sysctl_unregister(idev); 3562 return notifier_from_errno(err); 3563 } 3564 } 3565 break; 3566 3567 case NETDEV_PRE_TYPE_CHANGE: 3568 case NETDEV_POST_TYPE_CHANGE: 3569 if (idev) 3570 addrconf_type_change(dev, event); 3571 break; 3572 3573 case NETDEV_CHANGEUPPER: 3574 info = ptr; 3575 3576 /* flush all routes if dev is linked to or unlinked from 3577 * an L3 master device (e.g., VRF) 3578 */ 3579 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3580 addrconf_ifdown(dev, 0); 3581 } 3582 3583 return NOTIFY_OK; 3584 } 3585 3586 /* 3587 * addrconf module should be notified of a device going up 3588 */ 3589 static struct notifier_block ipv6_dev_notf = { 3590 .notifier_call = addrconf_notify, 3591 .priority = ADDRCONF_NOTIFY_PRIORITY, 3592 }; 3593 3594 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3595 { 3596 struct inet6_dev *idev; 3597 ASSERT_RTNL(); 3598 3599 idev = __in6_dev_get(dev); 3600 3601 if (event == NETDEV_POST_TYPE_CHANGE) 3602 ipv6_mc_remap(idev); 3603 else if (event == NETDEV_PRE_TYPE_CHANGE) 3604 ipv6_mc_unmap(idev); 3605 } 3606 3607 static bool addr_is_local(const struct in6_addr *addr) 3608 { 3609 return ipv6_addr_type(addr) & 3610 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3611 } 3612 3613 static int addrconf_ifdown(struct net_device *dev, int how) 3614 { 3615 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3616 struct net *net = dev_net(dev); 3617 struct inet6_dev *idev; 3618 struct inet6_ifaddr *ifa, *tmp; 3619 int _keep_addr; 3620 bool keep_addr; 3621 int state, i; 3622 3623 ASSERT_RTNL(); 3624 3625 rt6_disable_ip(dev, event); 3626 3627 idev = __in6_dev_get(dev); 3628 if (!idev) 3629 return -ENODEV; 3630 3631 /* 3632 * Step 1: remove reference to ipv6 device from parent device. 3633 * Do not dev_put! 3634 */ 3635 if (how) { 3636 idev->dead = 1; 3637 3638 /* protected by rtnl_lock */ 3639 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3640 3641 /* Step 1.5: remove snmp6 entry */ 3642 snmp6_unregister_dev(idev); 3643 3644 } 3645 3646 /* aggregate the system setting and interface setting */ 3647 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3648 if (!_keep_addr) 3649 _keep_addr = idev->cnf.keep_addr_on_down; 3650 3651 /* combine the user config with event to determine if permanent 3652 * addresses are to be removed from address hash table 3653 */ 3654 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3655 3656 /* Step 2: clear hash table */ 3657 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3658 struct hlist_head *h = &inet6_addr_lst[i]; 3659 3660 spin_lock_bh(&addrconf_hash_lock); 3661 restart: 3662 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3663 if (ifa->idev == idev) { 3664 addrconf_del_dad_work(ifa); 3665 /* combined flag + permanent flag decide if 3666 * address is retained on a down event 3667 */ 3668 if (!keep_addr || 3669 !(ifa->flags & IFA_F_PERMANENT) || 3670 addr_is_local(&ifa->addr)) { 3671 hlist_del_init_rcu(&ifa->addr_lst); 3672 goto restart; 3673 } 3674 } 3675 } 3676 spin_unlock_bh(&addrconf_hash_lock); 3677 } 3678 3679 write_lock_bh(&idev->lock); 3680 3681 addrconf_del_rs_timer(idev); 3682 3683 /* Step 2: clear flags for stateless addrconf */ 3684 if (!how) 3685 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3686 3687 /* Step 3: clear tempaddr list */ 3688 while (!list_empty(&idev->tempaddr_list)) { 3689 ifa = list_first_entry(&idev->tempaddr_list, 3690 struct inet6_ifaddr, tmp_list); 3691 list_del(&ifa->tmp_list); 3692 write_unlock_bh(&idev->lock); 3693 spin_lock_bh(&ifa->lock); 3694 3695 if (ifa->ifpub) { 3696 in6_ifa_put(ifa->ifpub); 3697 ifa->ifpub = NULL; 3698 } 3699 spin_unlock_bh(&ifa->lock); 3700 in6_ifa_put(ifa); 3701 write_lock_bh(&idev->lock); 3702 } 3703 3704 /* re-combine the user config with event to determine if permanent 3705 * addresses are to be removed from the interface list 3706 */ 3707 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3708 3709 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3710 struct rt6_info *rt = NULL; 3711 bool keep; 3712 3713 addrconf_del_dad_work(ifa); 3714 3715 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3716 !addr_is_local(&ifa->addr); 3717 3718 write_unlock_bh(&idev->lock); 3719 spin_lock_bh(&ifa->lock); 3720 3721 if (keep) { 3722 /* set state to skip the notifier below */ 3723 state = INET6_IFADDR_STATE_DEAD; 3724 ifa->state = INET6_IFADDR_STATE_PREDAD; 3725 if (!(ifa->flags & IFA_F_NODAD)) 3726 ifa->flags |= IFA_F_TENTATIVE; 3727 3728 rt = ifa->rt; 3729 ifa->rt = NULL; 3730 } else { 3731 state = ifa->state; 3732 ifa->state = INET6_IFADDR_STATE_DEAD; 3733 } 3734 3735 spin_unlock_bh(&ifa->lock); 3736 3737 if (rt) 3738 ip6_del_rt(rt); 3739 3740 if (state != INET6_IFADDR_STATE_DEAD) { 3741 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3742 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3743 } else { 3744 if (idev->cnf.forwarding) 3745 addrconf_leave_anycast(ifa); 3746 addrconf_leave_solict(ifa->idev, &ifa->addr); 3747 } 3748 3749 write_lock_bh(&idev->lock); 3750 if (!keep) { 3751 list_del_rcu(&ifa->if_list); 3752 in6_ifa_put(ifa); 3753 } 3754 } 3755 3756 write_unlock_bh(&idev->lock); 3757 3758 /* Step 5: Discard anycast and multicast list */ 3759 if (how) { 3760 ipv6_ac_destroy_dev(idev); 3761 ipv6_mc_destroy_dev(idev); 3762 } else { 3763 ipv6_mc_down(idev); 3764 } 3765 3766 idev->tstamp = jiffies; 3767 3768 /* Last: Shot the device (if unregistered) */ 3769 if (how) { 3770 addrconf_sysctl_unregister(idev); 3771 neigh_parms_release(&nd_tbl, idev->nd_parms); 3772 neigh_ifdown(&nd_tbl, dev); 3773 in6_dev_put(idev); 3774 } 3775 return 0; 3776 } 3777 3778 static void addrconf_rs_timer(struct timer_list *t) 3779 { 3780 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3781 struct net_device *dev = idev->dev; 3782 struct in6_addr lladdr; 3783 3784 write_lock(&idev->lock); 3785 if (idev->dead || !(idev->if_flags & IF_READY)) 3786 goto out; 3787 3788 if (!ipv6_accept_ra(idev)) 3789 goto out; 3790 3791 /* Announcement received after solicitation was sent */ 3792 if (idev->if_flags & IF_RA_RCVD) 3793 goto out; 3794 3795 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3796 write_unlock(&idev->lock); 3797 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3798 ndisc_send_rs(dev, &lladdr, 3799 &in6addr_linklocal_allrouters); 3800 else 3801 goto put; 3802 3803 write_lock(&idev->lock); 3804 idev->rs_interval = rfc3315_s14_backoff_update( 3805 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3806 /* The wait after the last probe can be shorter */ 3807 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3808 idev->cnf.rtr_solicits) ? 3809 idev->cnf.rtr_solicit_delay : 3810 idev->rs_interval); 3811 } else { 3812 /* 3813 * Note: we do not support deprecated "all on-link" 3814 * assumption any longer. 3815 */ 3816 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3817 } 3818 3819 out: 3820 write_unlock(&idev->lock); 3821 put: 3822 in6_dev_put(idev); 3823 } 3824 3825 /* 3826 * Duplicate Address Detection 3827 */ 3828 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3829 { 3830 unsigned long rand_num; 3831 struct inet6_dev *idev = ifp->idev; 3832 u64 nonce; 3833 3834 if (ifp->flags & IFA_F_OPTIMISTIC) 3835 rand_num = 0; 3836 else 3837 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3838 3839 nonce = 0; 3840 if (idev->cnf.enhanced_dad || 3841 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3842 do 3843 get_random_bytes(&nonce, 6); 3844 while (nonce == 0); 3845 } 3846 ifp->dad_nonce = nonce; 3847 ifp->dad_probes = idev->cnf.dad_transmits; 3848 addrconf_mod_dad_work(ifp, rand_num); 3849 } 3850 3851 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3852 { 3853 struct inet6_dev *idev = ifp->idev; 3854 struct net_device *dev = idev->dev; 3855 bool bump_id, notify = false; 3856 3857 addrconf_join_solict(dev, &ifp->addr); 3858 3859 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3860 3861 read_lock_bh(&idev->lock); 3862 spin_lock(&ifp->lock); 3863 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3864 goto out; 3865 3866 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3867 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3868 idev->cnf.accept_dad < 1) || 3869 !(ifp->flags&IFA_F_TENTATIVE) || 3870 ifp->flags & IFA_F_NODAD) { 3871 bool send_na = false; 3872 3873 if (ifp->flags & IFA_F_TENTATIVE && 3874 !(ifp->flags & IFA_F_OPTIMISTIC)) 3875 send_na = true; 3876 bump_id = ifp->flags & IFA_F_TENTATIVE; 3877 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3878 spin_unlock(&ifp->lock); 3879 read_unlock_bh(&idev->lock); 3880 3881 addrconf_dad_completed(ifp, bump_id, send_na); 3882 return; 3883 } 3884 3885 if (!(idev->if_flags & IF_READY)) { 3886 spin_unlock(&ifp->lock); 3887 read_unlock_bh(&idev->lock); 3888 /* 3889 * If the device is not ready: 3890 * - keep it tentative if it is a permanent address. 3891 * - otherwise, kill it. 3892 */ 3893 in6_ifa_hold(ifp); 3894 addrconf_dad_stop(ifp, 0); 3895 return; 3896 } 3897 3898 /* 3899 * Optimistic nodes can start receiving 3900 * Frames right away 3901 */ 3902 if (ifp->flags & IFA_F_OPTIMISTIC) { 3903 ip6_ins_rt(ifp->rt); 3904 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3905 /* Because optimistic nodes can use this address, 3906 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3907 */ 3908 notify = true; 3909 } 3910 } 3911 3912 addrconf_dad_kick(ifp); 3913 out: 3914 spin_unlock(&ifp->lock); 3915 read_unlock_bh(&idev->lock); 3916 if (notify) 3917 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3918 } 3919 3920 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3921 { 3922 bool begin_dad = false; 3923 3924 spin_lock_bh(&ifp->lock); 3925 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3926 ifp->state = INET6_IFADDR_STATE_PREDAD; 3927 begin_dad = true; 3928 } 3929 spin_unlock_bh(&ifp->lock); 3930 3931 if (begin_dad) 3932 addrconf_mod_dad_work(ifp, 0); 3933 } 3934 3935 static void addrconf_dad_work(struct work_struct *w) 3936 { 3937 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3938 struct inet6_ifaddr, 3939 dad_work); 3940 struct inet6_dev *idev = ifp->idev; 3941 bool bump_id, disable_ipv6 = false; 3942 struct in6_addr mcaddr; 3943 3944 enum { 3945 DAD_PROCESS, 3946 DAD_BEGIN, 3947 DAD_ABORT, 3948 } action = DAD_PROCESS; 3949 3950 rtnl_lock(); 3951 3952 spin_lock_bh(&ifp->lock); 3953 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3954 action = DAD_BEGIN; 3955 ifp->state = INET6_IFADDR_STATE_DAD; 3956 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3957 action = DAD_ABORT; 3958 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3959 3960 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3961 idev->cnf.accept_dad > 1) && 3962 !idev->cnf.disable_ipv6 && 3963 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3964 struct in6_addr addr; 3965 3966 addr.s6_addr32[0] = htonl(0xfe800000); 3967 addr.s6_addr32[1] = 0; 3968 3969 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3970 ipv6_addr_equal(&ifp->addr, &addr)) { 3971 /* DAD failed for link-local based on MAC */ 3972 idev->cnf.disable_ipv6 = 1; 3973 3974 pr_info("%s: IPv6 being disabled!\n", 3975 ifp->idev->dev->name); 3976 disable_ipv6 = true; 3977 } 3978 } 3979 } 3980 spin_unlock_bh(&ifp->lock); 3981 3982 if (action == DAD_BEGIN) { 3983 addrconf_dad_begin(ifp); 3984 goto out; 3985 } else if (action == DAD_ABORT) { 3986 in6_ifa_hold(ifp); 3987 addrconf_dad_stop(ifp, 1); 3988 if (disable_ipv6) 3989 addrconf_ifdown(idev->dev, 0); 3990 goto out; 3991 } 3992 3993 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3994 goto out; 3995 3996 write_lock_bh(&idev->lock); 3997 if (idev->dead || !(idev->if_flags & IF_READY)) { 3998 write_unlock_bh(&idev->lock); 3999 goto out; 4000 } 4001 4002 spin_lock(&ifp->lock); 4003 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4004 spin_unlock(&ifp->lock); 4005 write_unlock_bh(&idev->lock); 4006 goto out; 4007 } 4008 4009 if (ifp->dad_probes == 0) { 4010 bool send_na = false; 4011 4012 /* 4013 * DAD was successful 4014 */ 4015 4016 if (ifp->flags & IFA_F_TENTATIVE && 4017 !(ifp->flags & IFA_F_OPTIMISTIC)) 4018 send_na = true; 4019 bump_id = ifp->flags & IFA_F_TENTATIVE; 4020 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4021 spin_unlock(&ifp->lock); 4022 write_unlock_bh(&idev->lock); 4023 4024 addrconf_dad_completed(ifp, bump_id, send_na); 4025 4026 goto out; 4027 } 4028 4029 ifp->dad_probes--; 4030 addrconf_mod_dad_work(ifp, 4031 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4032 spin_unlock(&ifp->lock); 4033 write_unlock_bh(&idev->lock); 4034 4035 /* send a neighbour solicitation for our addr */ 4036 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4037 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4038 ifp->dad_nonce); 4039 out: 4040 in6_ifa_put(ifp); 4041 rtnl_unlock(); 4042 } 4043 4044 /* ifp->idev must be at least read locked */ 4045 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4046 { 4047 struct inet6_ifaddr *ifpiter; 4048 struct inet6_dev *idev = ifp->idev; 4049 4050 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4051 if (ifpiter->scope > IFA_LINK) 4052 break; 4053 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4054 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4055 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4056 IFA_F_PERMANENT) 4057 return false; 4058 } 4059 return true; 4060 } 4061 4062 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4063 bool send_na) 4064 { 4065 struct net_device *dev = ifp->idev->dev; 4066 struct in6_addr lladdr; 4067 bool send_rs, send_mld; 4068 4069 addrconf_del_dad_work(ifp); 4070 4071 /* 4072 * Configure the address for reception. Now it is valid. 4073 */ 4074 4075 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4076 4077 /* If added prefix is link local and we are prepared to process 4078 router advertisements, start sending router solicitations. 4079 */ 4080 4081 read_lock_bh(&ifp->idev->lock); 4082 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4083 send_rs = send_mld && 4084 ipv6_accept_ra(ifp->idev) && 4085 ifp->idev->cnf.rtr_solicits != 0 && 4086 (dev->flags&IFF_LOOPBACK) == 0; 4087 read_unlock_bh(&ifp->idev->lock); 4088 4089 /* While dad is in progress mld report's source address is in6_addrany. 4090 * Resend with proper ll now. 4091 */ 4092 if (send_mld) 4093 ipv6_mc_dad_complete(ifp->idev); 4094 4095 /* send unsolicited NA if enabled */ 4096 if (send_na && 4097 (ifp->idev->cnf.ndisc_notify || 4098 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4099 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4100 /*router=*/ !!ifp->idev->cnf.forwarding, 4101 /*solicited=*/ false, /*override=*/ true, 4102 /*inc_opt=*/ true); 4103 } 4104 4105 if (send_rs) { 4106 /* 4107 * If a host as already performed a random delay 4108 * [...] as part of DAD [...] there is no need 4109 * to delay again before sending the first RS 4110 */ 4111 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4112 return; 4113 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4114 4115 write_lock_bh(&ifp->idev->lock); 4116 spin_lock(&ifp->lock); 4117 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4118 ifp->idev->cnf.rtr_solicit_interval); 4119 ifp->idev->rs_probes = 1; 4120 ifp->idev->if_flags |= IF_RS_SENT; 4121 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4122 spin_unlock(&ifp->lock); 4123 write_unlock_bh(&ifp->idev->lock); 4124 } 4125 4126 if (bump_id) 4127 rt_genid_bump_ipv6(dev_net(dev)); 4128 4129 /* Make sure that a new temporary address will be created 4130 * before this temporary address becomes deprecated. 4131 */ 4132 if (ifp->flags & IFA_F_TEMPORARY) 4133 addrconf_verify_rtnl(); 4134 } 4135 4136 static void addrconf_dad_run(struct inet6_dev *idev) 4137 { 4138 struct inet6_ifaddr *ifp; 4139 4140 read_lock_bh(&idev->lock); 4141 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4142 spin_lock(&ifp->lock); 4143 if (ifp->flags & IFA_F_TENTATIVE && 4144 ifp->state == INET6_IFADDR_STATE_DAD) 4145 addrconf_dad_kick(ifp); 4146 spin_unlock(&ifp->lock); 4147 } 4148 read_unlock_bh(&idev->lock); 4149 } 4150 4151 #ifdef CONFIG_PROC_FS 4152 struct if6_iter_state { 4153 struct seq_net_private p; 4154 int bucket; 4155 int offset; 4156 }; 4157 4158 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4159 { 4160 struct if6_iter_state *state = seq->private; 4161 struct net *net = seq_file_net(seq); 4162 struct inet6_ifaddr *ifa = NULL; 4163 int p = 0; 4164 4165 /* initial bucket if pos is 0 */ 4166 if (pos == 0) { 4167 state->bucket = 0; 4168 state->offset = 0; 4169 } 4170 4171 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4172 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4173 addr_lst) { 4174 if (!net_eq(dev_net(ifa->idev->dev), net)) 4175 continue; 4176 /* sync with offset */ 4177 if (p < state->offset) { 4178 p++; 4179 continue; 4180 } 4181 state->offset++; 4182 return ifa; 4183 } 4184 4185 /* prepare for next bucket */ 4186 state->offset = 0; 4187 p = 0; 4188 } 4189 return NULL; 4190 } 4191 4192 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4193 struct inet6_ifaddr *ifa) 4194 { 4195 struct if6_iter_state *state = seq->private; 4196 struct net *net = seq_file_net(seq); 4197 4198 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4199 if (!net_eq(dev_net(ifa->idev->dev), net)) 4200 continue; 4201 state->offset++; 4202 return ifa; 4203 } 4204 4205 while (++state->bucket < IN6_ADDR_HSIZE) { 4206 state->offset = 0; 4207 hlist_for_each_entry_rcu(ifa, 4208 &inet6_addr_lst[state->bucket], addr_lst) { 4209 if (!net_eq(dev_net(ifa->idev->dev), net)) 4210 continue; 4211 state->offset++; 4212 return ifa; 4213 } 4214 } 4215 4216 return NULL; 4217 } 4218 4219 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4220 __acquires(rcu) 4221 { 4222 rcu_read_lock(); 4223 return if6_get_first(seq, *pos); 4224 } 4225 4226 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4227 { 4228 struct inet6_ifaddr *ifa; 4229 4230 ifa = if6_get_next(seq, v); 4231 ++*pos; 4232 return ifa; 4233 } 4234 4235 static void if6_seq_stop(struct seq_file *seq, void *v) 4236 __releases(rcu) 4237 { 4238 rcu_read_unlock(); 4239 } 4240 4241 static int if6_seq_show(struct seq_file *seq, void *v) 4242 { 4243 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4244 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4245 &ifp->addr, 4246 ifp->idev->dev->ifindex, 4247 ifp->prefix_len, 4248 ifp->scope, 4249 (u8) ifp->flags, 4250 ifp->idev->dev->name); 4251 return 0; 4252 } 4253 4254 static const struct seq_operations if6_seq_ops = { 4255 .start = if6_seq_start, 4256 .next = if6_seq_next, 4257 .show = if6_seq_show, 4258 .stop = if6_seq_stop, 4259 }; 4260 4261 static int if6_seq_open(struct inode *inode, struct file *file) 4262 { 4263 return seq_open_net(inode, file, &if6_seq_ops, 4264 sizeof(struct if6_iter_state)); 4265 } 4266 4267 static const struct file_operations if6_fops = { 4268 .open = if6_seq_open, 4269 .read = seq_read, 4270 .llseek = seq_lseek, 4271 .release = seq_release_net, 4272 }; 4273 4274 static int __net_init if6_proc_net_init(struct net *net) 4275 { 4276 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops)) 4277 return -ENOMEM; 4278 return 0; 4279 } 4280 4281 static void __net_exit if6_proc_net_exit(struct net *net) 4282 { 4283 remove_proc_entry("if_inet6", net->proc_net); 4284 } 4285 4286 static struct pernet_operations if6_proc_net_ops = { 4287 .init = if6_proc_net_init, 4288 .exit = if6_proc_net_exit, 4289 }; 4290 4291 int __init if6_proc_init(void) 4292 { 4293 return register_pernet_subsys(&if6_proc_net_ops); 4294 } 4295 4296 void if6_proc_exit(void) 4297 { 4298 unregister_pernet_subsys(&if6_proc_net_ops); 4299 } 4300 #endif /* CONFIG_PROC_FS */ 4301 4302 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4303 /* Check if address is a home address configured on any interface. */ 4304 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4305 { 4306 unsigned int hash = inet6_addr_hash(net, addr); 4307 struct inet6_ifaddr *ifp = NULL; 4308 int ret = 0; 4309 4310 rcu_read_lock(); 4311 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4312 if (!net_eq(dev_net(ifp->idev->dev), net)) 4313 continue; 4314 if (ipv6_addr_equal(&ifp->addr, addr) && 4315 (ifp->flags & IFA_F_HOMEADDRESS)) { 4316 ret = 1; 4317 break; 4318 } 4319 } 4320 rcu_read_unlock(); 4321 return ret; 4322 } 4323 #endif 4324 4325 /* 4326 * Periodic address status verification 4327 */ 4328 4329 static void addrconf_verify_rtnl(void) 4330 { 4331 unsigned long now, next, next_sec, next_sched; 4332 struct inet6_ifaddr *ifp; 4333 int i; 4334 4335 ASSERT_RTNL(); 4336 4337 rcu_read_lock_bh(); 4338 now = jiffies; 4339 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4340 4341 cancel_delayed_work(&addr_chk_work); 4342 4343 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4344 restart: 4345 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4346 unsigned long age; 4347 4348 /* When setting preferred_lft to a value not zero or 4349 * infinity, while valid_lft is infinity 4350 * IFA_F_PERMANENT has a non-infinity life time. 4351 */ 4352 if ((ifp->flags & IFA_F_PERMANENT) && 4353 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4354 continue; 4355 4356 spin_lock(&ifp->lock); 4357 /* We try to batch several events at once. */ 4358 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4359 4360 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4361 age >= ifp->valid_lft) { 4362 spin_unlock(&ifp->lock); 4363 in6_ifa_hold(ifp); 4364 ipv6_del_addr(ifp); 4365 goto restart; 4366 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4367 spin_unlock(&ifp->lock); 4368 continue; 4369 } else if (age >= ifp->prefered_lft) { 4370 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4371 int deprecate = 0; 4372 4373 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4374 deprecate = 1; 4375 ifp->flags |= IFA_F_DEPRECATED; 4376 } 4377 4378 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4379 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4380 next = ifp->tstamp + ifp->valid_lft * HZ; 4381 4382 spin_unlock(&ifp->lock); 4383 4384 if (deprecate) { 4385 in6_ifa_hold(ifp); 4386 4387 ipv6_ifa_notify(0, ifp); 4388 in6_ifa_put(ifp); 4389 goto restart; 4390 } 4391 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4392 !(ifp->flags&IFA_F_TENTATIVE)) { 4393 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4394 ifp->idev->cnf.dad_transmits * 4395 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4396 4397 if (age >= ifp->prefered_lft - regen_advance) { 4398 struct inet6_ifaddr *ifpub = ifp->ifpub; 4399 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4400 next = ifp->tstamp + ifp->prefered_lft * HZ; 4401 if (!ifp->regen_count && ifpub) { 4402 ifp->regen_count++; 4403 in6_ifa_hold(ifp); 4404 in6_ifa_hold(ifpub); 4405 spin_unlock(&ifp->lock); 4406 4407 spin_lock(&ifpub->lock); 4408 ifpub->regen_count = 0; 4409 spin_unlock(&ifpub->lock); 4410 rcu_read_unlock_bh(); 4411 ipv6_create_tempaddr(ifpub, ifp, true); 4412 in6_ifa_put(ifpub); 4413 in6_ifa_put(ifp); 4414 rcu_read_lock_bh(); 4415 goto restart; 4416 } 4417 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4418 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4419 spin_unlock(&ifp->lock); 4420 } else { 4421 /* ifp->prefered_lft <= ifp->valid_lft */ 4422 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4423 next = ifp->tstamp + ifp->prefered_lft * HZ; 4424 spin_unlock(&ifp->lock); 4425 } 4426 } 4427 } 4428 4429 next_sec = round_jiffies_up(next); 4430 next_sched = next; 4431 4432 /* If rounded timeout is accurate enough, accept it. */ 4433 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4434 next_sched = next_sec; 4435 4436 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4437 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4438 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4439 4440 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4441 now, next, next_sec, next_sched); 4442 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4443 rcu_read_unlock_bh(); 4444 } 4445 4446 static void addrconf_verify_work(struct work_struct *w) 4447 { 4448 rtnl_lock(); 4449 addrconf_verify_rtnl(); 4450 rtnl_unlock(); 4451 } 4452 4453 static void addrconf_verify(void) 4454 { 4455 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4456 } 4457 4458 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4459 struct in6_addr **peer_pfx) 4460 { 4461 struct in6_addr *pfx = NULL; 4462 4463 *peer_pfx = NULL; 4464 4465 if (addr) 4466 pfx = nla_data(addr); 4467 4468 if (local) { 4469 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4470 *peer_pfx = pfx; 4471 pfx = nla_data(local); 4472 } 4473 4474 return pfx; 4475 } 4476 4477 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4478 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4479 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4480 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4481 [IFA_FLAGS] = { .len = sizeof(u32) }, 4482 }; 4483 4484 static int 4485 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4486 struct netlink_ext_ack *extack) 4487 { 4488 struct net *net = sock_net(skb->sk); 4489 struct ifaddrmsg *ifm; 4490 struct nlattr *tb[IFA_MAX+1]; 4491 struct in6_addr *pfx, *peer_pfx; 4492 u32 ifa_flags; 4493 int err; 4494 4495 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4496 extack); 4497 if (err < 0) 4498 return err; 4499 4500 ifm = nlmsg_data(nlh); 4501 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4502 if (!pfx) 4503 return -EINVAL; 4504 4505 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4506 4507 /* We ignore other flags so far. */ 4508 ifa_flags &= IFA_F_MANAGETEMPADDR; 4509 4510 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4511 ifm->ifa_prefixlen); 4512 } 4513 4514 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4515 u32 prefered_lft, u32 valid_lft) 4516 { 4517 u32 flags; 4518 clock_t expires; 4519 unsigned long timeout; 4520 bool was_managetempaddr; 4521 bool had_prefixroute; 4522 4523 ASSERT_RTNL(); 4524 4525 if (!valid_lft || (prefered_lft > valid_lft)) 4526 return -EINVAL; 4527 4528 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4529 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4530 return -EINVAL; 4531 4532 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4533 ifa_flags &= ~IFA_F_OPTIMISTIC; 4534 4535 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4536 if (addrconf_finite_timeout(timeout)) { 4537 expires = jiffies_to_clock_t(timeout * HZ); 4538 valid_lft = timeout; 4539 flags = RTF_EXPIRES; 4540 } else { 4541 expires = 0; 4542 flags = 0; 4543 ifa_flags |= IFA_F_PERMANENT; 4544 } 4545 4546 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4547 if (addrconf_finite_timeout(timeout)) { 4548 if (timeout == 0) 4549 ifa_flags |= IFA_F_DEPRECATED; 4550 prefered_lft = timeout; 4551 } 4552 4553 spin_lock_bh(&ifp->lock); 4554 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4555 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4556 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4557 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4558 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4559 IFA_F_NOPREFIXROUTE); 4560 ifp->flags |= ifa_flags; 4561 ifp->tstamp = jiffies; 4562 ifp->valid_lft = valid_lft; 4563 ifp->prefered_lft = prefered_lft; 4564 4565 spin_unlock_bh(&ifp->lock); 4566 if (!(ifp->flags&IFA_F_TENTATIVE)) 4567 ipv6_ifa_notify(0, ifp); 4568 4569 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4570 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4571 expires, flags); 4572 } else if (had_prefixroute) { 4573 enum cleanup_prefix_rt_t action; 4574 unsigned long rt_expires; 4575 4576 write_lock_bh(&ifp->idev->lock); 4577 action = check_cleanup_prefix_route(ifp, &rt_expires); 4578 write_unlock_bh(&ifp->idev->lock); 4579 4580 if (action != CLEANUP_PREFIX_RT_NOP) { 4581 cleanup_prefix_route(ifp, rt_expires, 4582 action == CLEANUP_PREFIX_RT_DEL); 4583 } 4584 } 4585 4586 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4587 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4588 valid_lft = prefered_lft = 0; 4589 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4590 !was_managetempaddr, jiffies); 4591 } 4592 4593 addrconf_verify_rtnl(); 4594 4595 return 0; 4596 } 4597 4598 static int 4599 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4600 struct netlink_ext_ack *extack) 4601 { 4602 struct net *net = sock_net(skb->sk); 4603 struct ifaddrmsg *ifm; 4604 struct nlattr *tb[IFA_MAX+1]; 4605 struct in6_addr *pfx, *peer_pfx; 4606 struct inet6_ifaddr *ifa; 4607 struct net_device *dev; 4608 struct inet6_dev *idev; 4609 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4610 u32 ifa_flags; 4611 int err; 4612 4613 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4614 extack); 4615 if (err < 0) 4616 return err; 4617 4618 ifm = nlmsg_data(nlh); 4619 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4620 if (!pfx) 4621 return -EINVAL; 4622 4623 if (tb[IFA_CACHEINFO]) { 4624 struct ifa_cacheinfo *ci; 4625 4626 ci = nla_data(tb[IFA_CACHEINFO]); 4627 valid_lft = ci->ifa_valid; 4628 preferred_lft = ci->ifa_prefered; 4629 } else { 4630 preferred_lft = INFINITY_LIFE_TIME; 4631 valid_lft = INFINITY_LIFE_TIME; 4632 } 4633 4634 dev = __dev_get_by_index(net, ifm->ifa_index); 4635 if (!dev) 4636 return -ENODEV; 4637 4638 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4639 4640 /* We ignore other flags so far. */ 4641 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4642 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4643 4644 idev = ipv6_find_idev(dev); 4645 if (IS_ERR(idev)) 4646 return PTR_ERR(idev); 4647 4648 if (!ipv6_allow_optimistic_dad(net, idev)) 4649 ifa_flags &= ~IFA_F_OPTIMISTIC; 4650 4651 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) { 4652 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4653 return -EINVAL; 4654 } 4655 4656 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4657 if (!ifa) { 4658 /* 4659 * It would be best to check for !NLM_F_CREATE here but 4660 * userspace already relies on not having to provide this. 4661 */ 4662 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4663 ifm->ifa_prefixlen, ifa_flags, 4664 preferred_lft, valid_lft, extack); 4665 } 4666 4667 if (nlh->nlmsg_flags & NLM_F_EXCL || 4668 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4669 err = -EEXIST; 4670 else 4671 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4672 4673 in6_ifa_put(ifa); 4674 4675 return err; 4676 } 4677 4678 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4679 u8 scope, int ifindex) 4680 { 4681 struct ifaddrmsg *ifm; 4682 4683 ifm = nlmsg_data(nlh); 4684 ifm->ifa_family = AF_INET6; 4685 ifm->ifa_prefixlen = prefixlen; 4686 ifm->ifa_flags = flags; 4687 ifm->ifa_scope = scope; 4688 ifm->ifa_index = ifindex; 4689 } 4690 4691 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4692 unsigned long tstamp, u32 preferred, u32 valid) 4693 { 4694 struct ifa_cacheinfo ci; 4695 4696 ci.cstamp = cstamp_delta(cstamp); 4697 ci.tstamp = cstamp_delta(tstamp); 4698 ci.ifa_prefered = preferred; 4699 ci.ifa_valid = valid; 4700 4701 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4702 } 4703 4704 static inline int rt_scope(int ifa_scope) 4705 { 4706 if (ifa_scope & IFA_HOST) 4707 return RT_SCOPE_HOST; 4708 else if (ifa_scope & IFA_LINK) 4709 return RT_SCOPE_LINK; 4710 else if (ifa_scope & IFA_SITE) 4711 return RT_SCOPE_SITE; 4712 else 4713 return RT_SCOPE_UNIVERSE; 4714 } 4715 4716 static inline int inet6_ifaddr_msgsize(void) 4717 { 4718 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4719 + nla_total_size(16) /* IFA_LOCAL */ 4720 + nla_total_size(16) /* IFA_ADDRESS */ 4721 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4722 + nla_total_size(4) /* IFA_FLAGS */; 4723 } 4724 4725 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4726 u32 portid, u32 seq, int event, unsigned int flags) 4727 { 4728 struct nlmsghdr *nlh; 4729 u32 preferred, valid; 4730 4731 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4732 if (!nlh) 4733 return -EMSGSIZE; 4734 4735 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4736 ifa->idev->dev->ifindex); 4737 4738 if (!((ifa->flags&IFA_F_PERMANENT) && 4739 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4740 preferred = ifa->prefered_lft; 4741 valid = ifa->valid_lft; 4742 if (preferred != INFINITY_LIFE_TIME) { 4743 long tval = (jiffies - ifa->tstamp)/HZ; 4744 if (preferred > tval) 4745 preferred -= tval; 4746 else 4747 preferred = 0; 4748 if (valid != INFINITY_LIFE_TIME) { 4749 if (valid > tval) 4750 valid -= tval; 4751 else 4752 valid = 0; 4753 } 4754 } 4755 } else { 4756 preferred = INFINITY_LIFE_TIME; 4757 valid = INFINITY_LIFE_TIME; 4758 } 4759 4760 if (!ipv6_addr_any(&ifa->peer_addr)) { 4761 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4762 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4763 goto error; 4764 } else 4765 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4766 goto error; 4767 4768 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4769 goto error; 4770 4771 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4772 goto error; 4773 4774 nlmsg_end(skb, nlh); 4775 return 0; 4776 4777 error: 4778 nlmsg_cancel(skb, nlh); 4779 return -EMSGSIZE; 4780 } 4781 4782 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4783 u32 portid, u32 seq, int event, u16 flags) 4784 { 4785 struct nlmsghdr *nlh; 4786 u8 scope = RT_SCOPE_UNIVERSE; 4787 int ifindex = ifmca->idev->dev->ifindex; 4788 4789 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4790 scope = RT_SCOPE_SITE; 4791 4792 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4793 if (!nlh) 4794 return -EMSGSIZE; 4795 4796 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4797 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4798 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4799 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4800 nlmsg_cancel(skb, nlh); 4801 return -EMSGSIZE; 4802 } 4803 4804 nlmsg_end(skb, nlh); 4805 return 0; 4806 } 4807 4808 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4809 u32 portid, u32 seq, int event, unsigned int flags) 4810 { 4811 struct nlmsghdr *nlh; 4812 u8 scope = RT_SCOPE_UNIVERSE; 4813 int ifindex = ifaca->aca_idev->dev->ifindex; 4814 4815 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4816 scope = RT_SCOPE_SITE; 4817 4818 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4819 if (!nlh) 4820 return -EMSGSIZE; 4821 4822 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4823 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4824 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4825 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4826 nlmsg_cancel(skb, nlh); 4827 return -EMSGSIZE; 4828 } 4829 4830 nlmsg_end(skb, nlh); 4831 return 0; 4832 } 4833 4834 enum addr_type_t { 4835 UNICAST_ADDR, 4836 MULTICAST_ADDR, 4837 ANYCAST_ADDR, 4838 }; 4839 4840 /* called with rcu_read_lock() */ 4841 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4842 struct netlink_callback *cb, enum addr_type_t type, 4843 int s_ip_idx, int *p_ip_idx) 4844 { 4845 struct ifmcaddr6 *ifmca; 4846 struct ifacaddr6 *ifaca; 4847 int err = 1; 4848 int ip_idx = *p_ip_idx; 4849 4850 read_lock_bh(&idev->lock); 4851 switch (type) { 4852 case UNICAST_ADDR: { 4853 struct inet6_ifaddr *ifa; 4854 4855 /* unicast address incl. temp addr */ 4856 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4857 if (++ip_idx < s_ip_idx) 4858 continue; 4859 err = inet6_fill_ifaddr(skb, ifa, 4860 NETLINK_CB(cb->skb).portid, 4861 cb->nlh->nlmsg_seq, 4862 RTM_NEWADDR, 4863 NLM_F_MULTI); 4864 if (err < 0) 4865 break; 4866 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4867 } 4868 break; 4869 } 4870 case MULTICAST_ADDR: 4871 /* multicast address */ 4872 for (ifmca = idev->mc_list; ifmca; 4873 ifmca = ifmca->next, ip_idx++) { 4874 if (ip_idx < s_ip_idx) 4875 continue; 4876 err = inet6_fill_ifmcaddr(skb, ifmca, 4877 NETLINK_CB(cb->skb).portid, 4878 cb->nlh->nlmsg_seq, 4879 RTM_GETMULTICAST, 4880 NLM_F_MULTI); 4881 if (err < 0) 4882 break; 4883 } 4884 break; 4885 case ANYCAST_ADDR: 4886 /* anycast address */ 4887 for (ifaca = idev->ac_list; ifaca; 4888 ifaca = ifaca->aca_next, ip_idx++) { 4889 if (ip_idx < s_ip_idx) 4890 continue; 4891 err = inet6_fill_ifacaddr(skb, ifaca, 4892 NETLINK_CB(cb->skb).portid, 4893 cb->nlh->nlmsg_seq, 4894 RTM_GETANYCAST, 4895 NLM_F_MULTI); 4896 if (err < 0) 4897 break; 4898 } 4899 break; 4900 default: 4901 break; 4902 } 4903 read_unlock_bh(&idev->lock); 4904 *p_ip_idx = ip_idx; 4905 return err; 4906 } 4907 4908 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4909 enum addr_type_t type) 4910 { 4911 struct net *net = sock_net(skb->sk); 4912 int h, s_h; 4913 int idx, ip_idx; 4914 int s_idx, s_ip_idx; 4915 struct net_device *dev; 4916 struct inet6_dev *idev; 4917 struct hlist_head *head; 4918 4919 s_h = cb->args[0]; 4920 s_idx = idx = cb->args[1]; 4921 s_ip_idx = ip_idx = cb->args[2]; 4922 4923 rcu_read_lock(); 4924 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4925 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4926 idx = 0; 4927 head = &net->dev_index_head[h]; 4928 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4929 if (idx < s_idx) 4930 goto cont; 4931 if (h > s_h || idx > s_idx) 4932 s_ip_idx = 0; 4933 ip_idx = 0; 4934 idev = __in6_dev_get(dev); 4935 if (!idev) 4936 goto cont; 4937 4938 if (in6_dump_addrs(idev, skb, cb, type, 4939 s_ip_idx, &ip_idx) < 0) 4940 goto done; 4941 cont: 4942 idx++; 4943 } 4944 } 4945 done: 4946 rcu_read_unlock(); 4947 cb->args[0] = h; 4948 cb->args[1] = idx; 4949 cb->args[2] = ip_idx; 4950 4951 return skb->len; 4952 } 4953 4954 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4955 { 4956 enum addr_type_t type = UNICAST_ADDR; 4957 4958 return inet6_dump_addr(skb, cb, type); 4959 } 4960 4961 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4962 { 4963 enum addr_type_t type = MULTICAST_ADDR; 4964 4965 return inet6_dump_addr(skb, cb, type); 4966 } 4967 4968 4969 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4970 { 4971 enum addr_type_t type = ANYCAST_ADDR; 4972 4973 return inet6_dump_addr(skb, cb, type); 4974 } 4975 4976 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4977 struct netlink_ext_ack *extack) 4978 { 4979 struct net *net = sock_net(in_skb->sk); 4980 struct ifaddrmsg *ifm; 4981 struct nlattr *tb[IFA_MAX+1]; 4982 struct in6_addr *addr = NULL, *peer; 4983 struct net_device *dev = NULL; 4984 struct inet6_ifaddr *ifa; 4985 struct sk_buff *skb; 4986 int err; 4987 4988 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4989 extack); 4990 if (err < 0) 4991 return err; 4992 4993 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4994 if (!addr) 4995 return -EINVAL; 4996 4997 ifm = nlmsg_data(nlh); 4998 if (ifm->ifa_index) 4999 dev = dev_get_by_index(net, ifm->ifa_index); 5000 5001 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5002 if (!ifa) { 5003 err = -EADDRNOTAVAIL; 5004 goto errout; 5005 } 5006 5007 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5008 if (!skb) { 5009 err = -ENOBUFS; 5010 goto errout_ifa; 5011 } 5012 5013 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5014 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5015 if (err < 0) { 5016 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5017 WARN_ON(err == -EMSGSIZE); 5018 kfree_skb(skb); 5019 goto errout_ifa; 5020 } 5021 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5022 errout_ifa: 5023 in6_ifa_put(ifa); 5024 errout: 5025 if (dev) 5026 dev_put(dev); 5027 return err; 5028 } 5029 5030 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5031 { 5032 struct sk_buff *skb; 5033 struct net *net = dev_net(ifa->idev->dev); 5034 int err = -ENOBUFS; 5035 5036 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5037 if (!skb) 5038 goto errout; 5039 5040 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5041 if (err < 0) { 5042 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5043 WARN_ON(err == -EMSGSIZE); 5044 kfree_skb(skb); 5045 goto errout; 5046 } 5047 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5048 return; 5049 errout: 5050 if (err < 0) 5051 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5052 } 5053 5054 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5055 __s32 *array, int bytes) 5056 { 5057 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5058 5059 memset(array, 0, bytes); 5060 array[DEVCONF_FORWARDING] = cnf->forwarding; 5061 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5062 array[DEVCONF_MTU6] = cnf->mtu6; 5063 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5064 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5065 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5066 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5067 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5068 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5069 jiffies_to_msecs(cnf->rtr_solicit_interval); 5070 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5071 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5072 array[DEVCONF_RTR_SOLICIT_DELAY] = 5073 jiffies_to_msecs(cnf->rtr_solicit_delay); 5074 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5075 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5076 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5077 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5078 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5079 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5080 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5081 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5082 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5083 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5084 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5085 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5086 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5087 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5088 #ifdef CONFIG_IPV6_ROUTER_PREF 5089 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5090 array[DEVCONF_RTR_PROBE_INTERVAL] = 5091 jiffies_to_msecs(cnf->rtr_probe_interval); 5092 #ifdef CONFIG_IPV6_ROUTE_INFO 5093 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5094 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5095 #endif 5096 #endif 5097 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5098 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5099 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5100 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5101 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5102 #endif 5103 #ifdef CONFIG_IPV6_MROUTE 5104 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5105 #endif 5106 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5107 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5108 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5109 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5110 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5111 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5112 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5113 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5114 /* we omit DEVCONF_STABLE_SECRET for now */ 5115 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5116 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5117 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5118 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5119 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5120 #ifdef CONFIG_IPV6_SEG6_HMAC 5121 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5122 #endif 5123 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5124 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5125 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5126 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5127 } 5128 5129 static inline size_t inet6_ifla6_size(void) 5130 { 5131 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5132 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5133 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5134 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5135 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5136 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5137 } 5138 5139 static inline size_t inet6_if_nlmsg_size(void) 5140 { 5141 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5142 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5143 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5144 + nla_total_size(4) /* IFLA_MTU */ 5145 + nla_total_size(4) /* IFLA_LINK */ 5146 + nla_total_size(1) /* IFLA_OPERSTATE */ 5147 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5148 } 5149 5150 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5151 int bytes) 5152 { 5153 int i; 5154 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5155 BUG_ON(pad < 0); 5156 5157 /* Use put_unaligned() because stats may not be aligned for u64. */ 5158 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5159 for (i = 1; i < ICMP6_MIB_MAX; i++) 5160 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5161 5162 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5163 } 5164 5165 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5166 int bytes, size_t syncpoff) 5167 { 5168 int i, c; 5169 u64 buff[IPSTATS_MIB_MAX]; 5170 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5171 5172 BUG_ON(pad < 0); 5173 5174 memset(buff, 0, sizeof(buff)); 5175 buff[0] = IPSTATS_MIB_MAX; 5176 5177 for_each_possible_cpu(c) { 5178 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5179 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5180 } 5181 5182 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5183 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5184 } 5185 5186 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5187 int bytes) 5188 { 5189 switch (attrtype) { 5190 case IFLA_INET6_STATS: 5191 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5192 offsetof(struct ipstats_mib, syncp)); 5193 break; 5194 case IFLA_INET6_ICMP6STATS: 5195 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5196 break; 5197 } 5198 } 5199 5200 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5201 u32 ext_filter_mask) 5202 { 5203 struct nlattr *nla; 5204 struct ifla_cacheinfo ci; 5205 5206 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5207 goto nla_put_failure; 5208 ci.max_reasm_len = IPV6_MAXPLEN; 5209 ci.tstamp = cstamp_delta(idev->tstamp); 5210 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5211 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5212 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5213 goto nla_put_failure; 5214 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5215 if (!nla) 5216 goto nla_put_failure; 5217 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5218 5219 /* XXX - MC not implemented */ 5220 5221 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5222 return 0; 5223 5224 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5225 if (!nla) 5226 goto nla_put_failure; 5227 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5228 5229 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5230 if (!nla) 5231 goto nla_put_failure; 5232 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5233 5234 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5235 if (!nla) 5236 goto nla_put_failure; 5237 5238 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5239 goto nla_put_failure; 5240 5241 read_lock_bh(&idev->lock); 5242 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5243 read_unlock_bh(&idev->lock); 5244 5245 return 0; 5246 5247 nla_put_failure: 5248 return -EMSGSIZE; 5249 } 5250 5251 static size_t inet6_get_link_af_size(const struct net_device *dev, 5252 u32 ext_filter_mask) 5253 { 5254 if (!__in6_dev_get(dev)) 5255 return 0; 5256 5257 return inet6_ifla6_size(); 5258 } 5259 5260 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5261 u32 ext_filter_mask) 5262 { 5263 struct inet6_dev *idev = __in6_dev_get(dev); 5264 5265 if (!idev) 5266 return -ENODATA; 5267 5268 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5269 return -EMSGSIZE; 5270 5271 return 0; 5272 } 5273 5274 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5275 { 5276 struct inet6_ifaddr *ifp; 5277 struct net_device *dev = idev->dev; 5278 bool clear_token, update_rs = false; 5279 struct in6_addr ll_addr; 5280 5281 ASSERT_RTNL(); 5282 5283 if (!token) 5284 return -EINVAL; 5285 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5286 return -EINVAL; 5287 if (!ipv6_accept_ra(idev)) 5288 return -EINVAL; 5289 if (idev->cnf.rtr_solicits == 0) 5290 return -EINVAL; 5291 5292 write_lock_bh(&idev->lock); 5293 5294 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5295 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5296 5297 write_unlock_bh(&idev->lock); 5298 5299 clear_token = ipv6_addr_any(token); 5300 if (clear_token) 5301 goto update_lft; 5302 5303 if (!idev->dead && (idev->if_flags & IF_READY) && 5304 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5305 IFA_F_OPTIMISTIC)) { 5306 /* If we're not ready, then normal ifup will take care 5307 * of this. Otherwise, we need to request our rs here. 5308 */ 5309 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5310 update_rs = true; 5311 } 5312 5313 update_lft: 5314 write_lock_bh(&idev->lock); 5315 5316 if (update_rs) { 5317 idev->if_flags |= IF_RS_SENT; 5318 idev->rs_interval = rfc3315_s14_backoff_init( 5319 idev->cnf.rtr_solicit_interval); 5320 idev->rs_probes = 1; 5321 addrconf_mod_rs_timer(idev, idev->rs_interval); 5322 } 5323 5324 /* Well, that's kinda nasty ... */ 5325 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5326 spin_lock(&ifp->lock); 5327 if (ifp->tokenized) { 5328 ifp->valid_lft = 0; 5329 ifp->prefered_lft = 0; 5330 } 5331 spin_unlock(&ifp->lock); 5332 } 5333 5334 write_unlock_bh(&idev->lock); 5335 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5336 addrconf_verify_rtnl(); 5337 return 0; 5338 } 5339 5340 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5341 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5342 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5343 }; 5344 5345 static int inet6_validate_link_af(const struct net_device *dev, 5346 const struct nlattr *nla) 5347 { 5348 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5349 5350 if (dev && !__in6_dev_get(dev)) 5351 return -EAFNOSUPPORT; 5352 5353 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5354 NULL); 5355 } 5356 5357 static int check_addr_gen_mode(int mode) 5358 { 5359 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5360 mode != IN6_ADDR_GEN_MODE_NONE && 5361 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5362 mode != IN6_ADDR_GEN_MODE_RANDOM) 5363 return -EINVAL; 5364 return 1; 5365 } 5366 5367 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5368 int mode) 5369 { 5370 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5371 !idev->cnf.stable_secret.initialized && 5372 !net->ipv6.devconf_dflt->stable_secret.initialized) 5373 return -EINVAL; 5374 return 1; 5375 } 5376 5377 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5378 { 5379 int err = -EINVAL; 5380 struct inet6_dev *idev = __in6_dev_get(dev); 5381 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5382 5383 if (!idev) 5384 return -EAFNOSUPPORT; 5385 5386 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5387 BUG(); 5388 5389 if (tb[IFLA_INET6_TOKEN]) { 5390 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5391 if (err) 5392 return err; 5393 } 5394 5395 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5396 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5397 5398 if (check_addr_gen_mode(mode) < 0 || 5399 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5400 return -EINVAL; 5401 5402 idev->cnf.addr_gen_mode = mode; 5403 err = 0; 5404 } 5405 5406 return err; 5407 } 5408 5409 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5410 u32 portid, u32 seq, int event, unsigned int flags) 5411 { 5412 struct net_device *dev = idev->dev; 5413 struct ifinfomsg *hdr; 5414 struct nlmsghdr *nlh; 5415 void *protoinfo; 5416 5417 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5418 if (!nlh) 5419 return -EMSGSIZE; 5420 5421 hdr = nlmsg_data(nlh); 5422 hdr->ifi_family = AF_INET6; 5423 hdr->__ifi_pad = 0; 5424 hdr->ifi_type = dev->type; 5425 hdr->ifi_index = dev->ifindex; 5426 hdr->ifi_flags = dev_get_flags(dev); 5427 hdr->ifi_change = 0; 5428 5429 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5430 (dev->addr_len && 5431 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5432 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5433 (dev->ifindex != dev_get_iflink(dev) && 5434 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5435 nla_put_u8(skb, IFLA_OPERSTATE, 5436 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5437 goto nla_put_failure; 5438 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5439 if (!protoinfo) 5440 goto nla_put_failure; 5441 5442 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5443 goto nla_put_failure; 5444 5445 nla_nest_end(skb, protoinfo); 5446 nlmsg_end(skb, nlh); 5447 return 0; 5448 5449 nla_put_failure: 5450 nlmsg_cancel(skb, nlh); 5451 return -EMSGSIZE; 5452 } 5453 5454 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5455 { 5456 struct net *net = sock_net(skb->sk); 5457 int h, s_h; 5458 int idx = 0, s_idx; 5459 struct net_device *dev; 5460 struct inet6_dev *idev; 5461 struct hlist_head *head; 5462 5463 s_h = cb->args[0]; 5464 s_idx = cb->args[1]; 5465 5466 rcu_read_lock(); 5467 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5468 idx = 0; 5469 head = &net->dev_index_head[h]; 5470 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5471 if (idx < s_idx) 5472 goto cont; 5473 idev = __in6_dev_get(dev); 5474 if (!idev) 5475 goto cont; 5476 if (inet6_fill_ifinfo(skb, idev, 5477 NETLINK_CB(cb->skb).portid, 5478 cb->nlh->nlmsg_seq, 5479 RTM_NEWLINK, NLM_F_MULTI) < 0) 5480 goto out; 5481 cont: 5482 idx++; 5483 } 5484 } 5485 out: 5486 rcu_read_unlock(); 5487 cb->args[1] = idx; 5488 cb->args[0] = h; 5489 5490 return skb->len; 5491 } 5492 5493 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5494 { 5495 struct sk_buff *skb; 5496 struct net *net = dev_net(idev->dev); 5497 int err = -ENOBUFS; 5498 5499 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5500 if (!skb) 5501 goto errout; 5502 5503 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5504 if (err < 0) { 5505 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5506 WARN_ON(err == -EMSGSIZE); 5507 kfree_skb(skb); 5508 goto errout; 5509 } 5510 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5511 return; 5512 errout: 5513 if (err < 0) 5514 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5515 } 5516 5517 static inline size_t inet6_prefix_nlmsg_size(void) 5518 { 5519 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5520 + nla_total_size(sizeof(struct in6_addr)) 5521 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5522 } 5523 5524 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5525 struct prefix_info *pinfo, u32 portid, u32 seq, 5526 int event, unsigned int flags) 5527 { 5528 struct prefixmsg *pmsg; 5529 struct nlmsghdr *nlh; 5530 struct prefix_cacheinfo ci; 5531 5532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5533 if (!nlh) 5534 return -EMSGSIZE; 5535 5536 pmsg = nlmsg_data(nlh); 5537 pmsg->prefix_family = AF_INET6; 5538 pmsg->prefix_pad1 = 0; 5539 pmsg->prefix_pad2 = 0; 5540 pmsg->prefix_ifindex = idev->dev->ifindex; 5541 pmsg->prefix_len = pinfo->prefix_len; 5542 pmsg->prefix_type = pinfo->type; 5543 pmsg->prefix_pad3 = 0; 5544 pmsg->prefix_flags = 0; 5545 if (pinfo->onlink) 5546 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5547 if (pinfo->autoconf) 5548 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5549 5550 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5551 goto nla_put_failure; 5552 ci.preferred_time = ntohl(pinfo->prefered); 5553 ci.valid_time = ntohl(pinfo->valid); 5554 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5555 goto nla_put_failure; 5556 nlmsg_end(skb, nlh); 5557 return 0; 5558 5559 nla_put_failure: 5560 nlmsg_cancel(skb, nlh); 5561 return -EMSGSIZE; 5562 } 5563 5564 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5565 struct prefix_info *pinfo) 5566 { 5567 struct sk_buff *skb; 5568 struct net *net = dev_net(idev->dev); 5569 int err = -ENOBUFS; 5570 5571 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5572 if (!skb) 5573 goto errout; 5574 5575 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5576 if (err < 0) { 5577 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5578 WARN_ON(err == -EMSGSIZE); 5579 kfree_skb(skb); 5580 goto errout; 5581 } 5582 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5583 return; 5584 errout: 5585 if (err < 0) 5586 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5587 } 5588 5589 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5590 { 5591 struct net *net = dev_net(ifp->idev->dev); 5592 5593 if (event) 5594 ASSERT_RTNL(); 5595 5596 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5597 5598 switch (event) { 5599 case RTM_NEWADDR: 5600 /* 5601 * If the address was optimistic 5602 * we inserted the route at the start of 5603 * our DAD process, so we don't need 5604 * to do it again 5605 */ 5606 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5607 ip6_ins_rt(ifp->rt); 5608 if (ifp->idev->cnf.forwarding) 5609 addrconf_join_anycast(ifp); 5610 if (!ipv6_addr_any(&ifp->peer_addr)) 5611 addrconf_prefix_route(&ifp->peer_addr, 128, 5612 ifp->idev->dev, 0, 0); 5613 break; 5614 case RTM_DELADDR: 5615 if (ifp->idev->cnf.forwarding) 5616 addrconf_leave_anycast(ifp); 5617 addrconf_leave_solict(ifp->idev, &ifp->addr); 5618 if (!ipv6_addr_any(&ifp->peer_addr)) { 5619 struct rt6_info *rt; 5620 5621 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5622 ifp->idev->dev, 0, 0); 5623 if (rt) 5624 ip6_del_rt(rt); 5625 } 5626 if (ifp->rt) { 5627 if (dst_hold_safe(&ifp->rt->dst)) 5628 ip6_del_rt(ifp->rt); 5629 } 5630 rt_genid_bump_ipv6(net); 5631 break; 5632 } 5633 atomic_inc(&net->ipv6.dev_addr_genid); 5634 } 5635 5636 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5637 { 5638 rcu_read_lock_bh(); 5639 if (likely(ifp->idev->dead == 0)) 5640 __ipv6_ifa_notify(event, ifp); 5641 rcu_read_unlock_bh(); 5642 } 5643 5644 #ifdef CONFIG_SYSCTL 5645 5646 static 5647 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5648 void __user *buffer, size_t *lenp, loff_t *ppos) 5649 { 5650 int *valp = ctl->data; 5651 int val = *valp; 5652 loff_t pos = *ppos; 5653 struct ctl_table lctl; 5654 int ret; 5655 5656 /* 5657 * ctl->data points to idev->cnf.forwarding, we should 5658 * not modify it until we get the rtnl lock. 5659 */ 5660 lctl = *ctl; 5661 lctl.data = &val; 5662 5663 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5664 5665 if (write) 5666 ret = addrconf_fixup_forwarding(ctl, valp, val); 5667 if (ret) 5668 *ppos = pos; 5669 return ret; 5670 } 5671 5672 static 5673 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5674 void __user *buffer, size_t *lenp, loff_t *ppos) 5675 { 5676 struct inet6_dev *idev = ctl->extra1; 5677 int min_mtu = IPV6_MIN_MTU; 5678 struct ctl_table lctl; 5679 5680 lctl = *ctl; 5681 lctl.extra1 = &min_mtu; 5682 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5683 5684 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5685 } 5686 5687 static void dev_disable_change(struct inet6_dev *idev) 5688 { 5689 struct netdev_notifier_info info; 5690 5691 if (!idev || !idev->dev) 5692 return; 5693 5694 netdev_notifier_info_init(&info, idev->dev); 5695 if (idev->cnf.disable_ipv6) 5696 addrconf_notify(NULL, NETDEV_DOWN, &info); 5697 else 5698 addrconf_notify(NULL, NETDEV_UP, &info); 5699 } 5700 5701 static void addrconf_disable_change(struct net *net, __s32 newf) 5702 { 5703 struct net_device *dev; 5704 struct inet6_dev *idev; 5705 5706 for_each_netdev(net, dev) { 5707 idev = __in6_dev_get(dev); 5708 if (idev) { 5709 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5710 idev->cnf.disable_ipv6 = newf; 5711 if (changed) 5712 dev_disable_change(idev); 5713 } 5714 } 5715 } 5716 5717 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5718 { 5719 struct net *net; 5720 int old; 5721 5722 if (!rtnl_trylock()) 5723 return restart_syscall(); 5724 5725 net = (struct net *)table->extra2; 5726 old = *p; 5727 *p = newf; 5728 5729 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5730 rtnl_unlock(); 5731 return 0; 5732 } 5733 5734 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5735 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5736 addrconf_disable_change(net, newf); 5737 } else if ((!newf) ^ (!old)) 5738 dev_disable_change((struct inet6_dev *)table->extra1); 5739 5740 rtnl_unlock(); 5741 return 0; 5742 } 5743 5744 static 5745 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5746 void __user *buffer, size_t *lenp, loff_t *ppos) 5747 { 5748 int *valp = ctl->data; 5749 int val = *valp; 5750 loff_t pos = *ppos; 5751 struct ctl_table lctl; 5752 int ret; 5753 5754 /* 5755 * ctl->data points to idev->cnf.disable_ipv6, we should 5756 * not modify it until we get the rtnl lock. 5757 */ 5758 lctl = *ctl; 5759 lctl.data = &val; 5760 5761 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5762 5763 if (write) 5764 ret = addrconf_disable_ipv6(ctl, valp, val); 5765 if (ret) 5766 *ppos = pos; 5767 return ret; 5768 } 5769 5770 static 5771 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5772 void __user *buffer, size_t *lenp, loff_t *ppos) 5773 { 5774 int *valp = ctl->data; 5775 int ret; 5776 int old, new; 5777 5778 old = *valp; 5779 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5780 new = *valp; 5781 5782 if (write && old != new) { 5783 struct net *net = ctl->extra2; 5784 5785 if (!rtnl_trylock()) 5786 return restart_syscall(); 5787 5788 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5789 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5790 NETCONFA_PROXY_NEIGH, 5791 NETCONFA_IFINDEX_DEFAULT, 5792 net->ipv6.devconf_dflt); 5793 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5794 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5795 NETCONFA_PROXY_NEIGH, 5796 NETCONFA_IFINDEX_ALL, 5797 net->ipv6.devconf_all); 5798 else { 5799 struct inet6_dev *idev = ctl->extra1; 5800 5801 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5802 NETCONFA_PROXY_NEIGH, 5803 idev->dev->ifindex, 5804 &idev->cnf); 5805 } 5806 rtnl_unlock(); 5807 } 5808 5809 return ret; 5810 } 5811 5812 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5813 void __user *buffer, size_t *lenp, 5814 loff_t *ppos) 5815 { 5816 int ret = 0; 5817 int new_val; 5818 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5819 struct net *net = (struct net *)ctl->extra2; 5820 5821 if (!rtnl_trylock()) 5822 return restart_syscall(); 5823 5824 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5825 5826 if (write) { 5827 new_val = *((int *)ctl->data); 5828 5829 if (check_addr_gen_mode(new_val) < 0) { 5830 ret = -EINVAL; 5831 goto out; 5832 } 5833 5834 /* request for default */ 5835 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5836 ipv6_devconf_dflt.addr_gen_mode = new_val; 5837 5838 /* request for individual net device */ 5839 } else { 5840 if (!idev) 5841 goto out; 5842 5843 if (check_stable_privacy(idev, net, new_val) < 0) { 5844 ret = -EINVAL; 5845 goto out; 5846 } 5847 5848 if (idev->cnf.addr_gen_mode != new_val) { 5849 idev->cnf.addr_gen_mode = new_val; 5850 addrconf_dev_config(idev->dev); 5851 } 5852 } 5853 } 5854 5855 out: 5856 rtnl_unlock(); 5857 5858 return ret; 5859 } 5860 5861 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5862 void __user *buffer, size_t *lenp, 5863 loff_t *ppos) 5864 { 5865 int err; 5866 struct in6_addr addr; 5867 char str[IPV6_MAX_STRLEN]; 5868 struct ctl_table lctl = *ctl; 5869 struct net *net = ctl->extra2; 5870 struct ipv6_stable_secret *secret = ctl->data; 5871 5872 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5873 return -EIO; 5874 5875 lctl.maxlen = IPV6_MAX_STRLEN; 5876 lctl.data = str; 5877 5878 if (!rtnl_trylock()) 5879 return restart_syscall(); 5880 5881 if (!write && !secret->initialized) { 5882 err = -EIO; 5883 goto out; 5884 } 5885 5886 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5887 if (err >= sizeof(str)) { 5888 err = -EIO; 5889 goto out; 5890 } 5891 5892 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5893 if (err || !write) 5894 goto out; 5895 5896 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5897 err = -EIO; 5898 goto out; 5899 } 5900 5901 secret->initialized = true; 5902 secret->secret = addr; 5903 5904 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5905 struct net_device *dev; 5906 5907 for_each_netdev(net, dev) { 5908 struct inet6_dev *idev = __in6_dev_get(dev); 5909 5910 if (idev) { 5911 idev->cnf.addr_gen_mode = 5912 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5913 } 5914 } 5915 } else { 5916 struct inet6_dev *idev = ctl->extra1; 5917 5918 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5919 } 5920 5921 out: 5922 rtnl_unlock(); 5923 5924 return err; 5925 } 5926 5927 static 5928 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5929 int write, 5930 void __user *buffer, 5931 size_t *lenp, 5932 loff_t *ppos) 5933 { 5934 int *valp = ctl->data; 5935 int val = *valp; 5936 loff_t pos = *ppos; 5937 struct ctl_table lctl; 5938 int ret; 5939 5940 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5941 * we should not modify it until we get the rtnl lock. 5942 */ 5943 lctl = *ctl; 5944 lctl.data = &val; 5945 5946 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5947 5948 if (write) 5949 ret = addrconf_fixup_linkdown(ctl, valp, val); 5950 if (ret) 5951 *ppos = pos; 5952 return ret; 5953 } 5954 5955 static 5956 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5957 { 5958 if (rt) { 5959 if (action) 5960 rt->dst.flags |= DST_NOPOLICY; 5961 else 5962 rt->dst.flags &= ~DST_NOPOLICY; 5963 } 5964 } 5965 5966 static 5967 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5968 { 5969 struct inet6_ifaddr *ifa; 5970 5971 read_lock_bh(&idev->lock); 5972 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5973 spin_lock(&ifa->lock); 5974 if (ifa->rt) { 5975 struct rt6_info *rt = ifa->rt; 5976 int cpu; 5977 5978 rcu_read_lock(); 5979 addrconf_set_nopolicy(ifa->rt, val); 5980 if (rt->rt6i_pcpu) { 5981 for_each_possible_cpu(cpu) { 5982 struct rt6_info **rtp; 5983 5984 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5985 addrconf_set_nopolicy(*rtp, val); 5986 } 5987 } 5988 rcu_read_unlock(); 5989 } 5990 spin_unlock(&ifa->lock); 5991 } 5992 read_unlock_bh(&idev->lock); 5993 } 5994 5995 static 5996 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5997 { 5998 struct inet6_dev *idev; 5999 struct net *net; 6000 6001 if (!rtnl_trylock()) 6002 return restart_syscall(); 6003 6004 *valp = val; 6005 6006 net = (struct net *)ctl->extra2; 6007 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6008 rtnl_unlock(); 6009 return 0; 6010 } 6011 6012 if (valp == &net->ipv6.devconf_all->disable_policy) { 6013 struct net_device *dev; 6014 6015 for_each_netdev(net, dev) { 6016 idev = __in6_dev_get(dev); 6017 if (idev) 6018 addrconf_disable_policy_idev(idev, val); 6019 } 6020 } else { 6021 idev = (struct inet6_dev *)ctl->extra1; 6022 addrconf_disable_policy_idev(idev, val); 6023 } 6024 6025 rtnl_unlock(); 6026 return 0; 6027 } 6028 6029 static 6030 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6031 void __user *buffer, size_t *lenp, 6032 loff_t *ppos) 6033 { 6034 int *valp = ctl->data; 6035 int val = *valp; 6036 loff_t pos = *ppos; 6037 struct ctl_table lctl; 6038 int ret; 6039 6040 lctl = *ctl; 6041 lctl.data = &val; 6042 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6043 6044 if (write && (*valp != val)) 6045 ret = addrconf_disable_policy(ctl, valp, val); 6046 6047 if (ret) 6048 *ppos = pos; 6049 6050 return ret; 6051 } 6052 6053 static int minus_one = -1; 6054 static const int zero = 0; 6055 static const int one = 1; 6056 static const int two_five_five = 255; 6057 6058 static const struct ctl_table addrconf_sysctl[] = { 6059 { 6060 .procname = "forwarding", 6061 .data = &ipv6_devconf.forwarding, 6062 .maxlen = sizeof(int), 6063 .mode = 0644, 6064 .proc_handler = addrconf_sysctl_forward, 6065 }, 6066 { 6067 .procname = "hop_limit", 6068 .data = &ipv6_devconf.hop_limit, 6069 .maxlen = sizeof(int), 6070 .mode = 0644, 6071 .proc_handler = proc_dointvec_minmax, 6072 .extra1 = (void *)&one, 6073 .extra2 = (void *)&two_five_five, 6074 }, 6075 { 6076 .procname = "mtu", 6077 .data = &ipv6_devconf.mtu6, 6078 .maxlen = sizeof(int), 6079 .mode = 0644, 6080 .proc_handler = addrconf_sysctl_mtu, 6081 }, 6082 { 6083 .procname = "accept_ra", 6084 .data = &ipv6_devconf.accept_ra, 6085 .maxlen = sizeof(int), 6086 .mode = 0644, 6087 .proc_handler = proc_dointvec, 6088 }, 6089 { 6090 .procname = "accept_redirects", 6091 .data = &ipv6_devconf.accept_redirects, 6092 .maxlen = sizeof(int), 6093 .mode = 0644, 6094 .proc_handler = proc_dointvec, 6095 }, 6096 { 6097 .procname = "autoconf", 6098 .data = &ipv6_devconf.autoconf, 6099 .maxlen = sizeof(int), 6100 .mode = 0644, 6101 .proc_handler = proc_dointvec, 6102 }, 6103 { 6104 .procname = "dad_transmits", 6105 .data = &ipv6_devconf.dad_transmits, 6106 .maxlen = sizeof(int), 6107 .mode = 0644, 6108 .proc_handler = proc_dointvec, 6109 }, 6110 { 6111 .procname = "router_solicitations", 6112 .data = &ipv6_devconf.rtr_solicits, 6113 .maxlen = sizeof(int), 6114 .mode = 0644, 6115 .proc_handler = proc_dointvec_minmax, 6116 .extra1 = &minus_one, 6117 }, 6118 { 6119 .procname = "router_solicitation_interval", 6120 .data = &ipv6_devconf.rtr_solicit_interval, 6121 .maxlen = sizeof(int), 6122 .mode = 0644, 6123 .proc_handler = proc_dointvec_jiffies, 6124 }, 6125 { 6126 .procname = "router_solicitation_max_interval", 6127 .data = &ipv6_devconf.rtr_solicit_max_interval, 6128 .maxlen = sizeof(int), 6129 .mode = 0644, 6130 .proc_handler = proc_dointvec_jiffies, 6131 }, 6132 { 6133 .procname = "router_solicitation_delay", 6134 .data = &ipv6_devconf.rtr_solicit_delay, 6135 .maxlen = sizeof(int), 6136 .mode = 0644, 6137 .proc_handler = proc_dointvec_jiffies, 6138 }, 6139 { 6140 .procname = "force_mld_version", 6141 .data = &ipv6_devconf.force_mld_version, 6142 .maxlen = sizeof(int), 6143 .mode = 0644, 6144 .proc_handler = proc_dointvec, 6145 }, 6146 { 6147 .procname = "mldv1_unsolicited_report_interval", 6148 .data = 6149 &ipv6_devconf.mldv1_unsolicited_report_interval, 6150 .maxlen = sizeof(int), 6151 .mode = 0644, 6152 .proc_handler = proc_dointvec_ms_jiffies, 6153 }, 6154 { 6155 .procname = "mldv2_unsolicited_report_interval", 6156 .data = 6157 &ipv6_devconf.mldv2_unsolicited_report_interval, 6158 .maxlen = sizeof(int), 6159 .mode = 0644, 6160 .proc_handler = proc_dointvec_ms_jiffies, 6161 }, 6162 { 6163 .procname = "use_tempaddr", 6164 .data = &ipv6_devconf.use_tempaddr, 6165 .maxlen = sizeof(int), 6166 .mode = 0644, 6167 .proc_handler = proc_dointvec, 6168 }, 6169 { 6170 .procname = "temp_valid_lft", 6171 .data = &ipv6_devconf.temp_valid_lft, 6172 .maxlen = sizeof(int), 6173 .mode = 0644, 6174 .proc_handler = proc_dointvec, 6175 }, 6176 { 6177 .procname = "temp_prefered_lft", 6178 .data = &ipv6_devconf.temp_prefered_lft, 6179 .maxlen = sizeof(int), 6180 .mode = 0644, 6181 .proc_handler = proc_dointvec, 6182 }, 6183 { 6184 .procname = "regen_max_retry", 6185 .data = &ipv6_devconf.regen_max_retry, 6186 .maxlen = sizeof(int), 6187 .mode = 0644, 6188 .proc_handler = proc_dointvec, 6189 }, 6190 { 6191 .procname = "max_desync_factor", 6192 .data = &ipv6_devconf.max_desync_factor, 6193 .maxlen = sizeof(int), 6194 .mode = 0644, 6195 .proc_handler = proc_dointvec, 6196 }, 6197 { 6198 .procname = "max_addresses", 6199 .data = &ipv6_devconf.max_addresses, 6200 .maxlen = sizeof(int), 6201 .mode = 0644, 6202 .proc_handler = proc_dointvec, 6203 }, 6204 { 6205 .procname = "accept_ra_defrtr", 6206 .data = &ipv6_devconf.accept_ra_defrtr, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = proc_dointvec, 6210 }, 6211 { 6212 .procname = "accept_ra_min_hop_limit", 6213 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6214 .maxlen = sizeof(int), 6215 .mode = 0644, 6216 .proc_handler = proc_dointvec, 6217 }, 6218 { 6219 .procname = "accept_ra_pinfo", 6220 .data = &ipv6_devconf.accept_ra_pinfo, 6221 .maxlen = sizeof(int), 6222 .mode = 0644, 6223 .proc_handler = proc_dointvec, 6224 }, 6225 #ifdef CONFIG_IPV6_ROUTER_PREF 6226 { 6227 .procname = "accept_ra_rtr_pref", 6228 .data = &ipv6_devconf.accept_ra_rtr_pref, 6229 .maxlen = sizeof(int), 6230 .mode = 0644, 6231 .proc_handler = proc_dointvec, 6232 }, 6233 { 6234 .procname = "router_probe_interval", 6235 .data = &ipv6_devconf.rtr_probe_interval, 6236 .maxlen = sizeof(int), 6237 .mode = 0644, 6238 .proc_handler = proc_dointvec_jiffies, 6239 }, 6240 #ifdef CONFIG_IPV6_ROUTE_INFO 6241 { 6242 .procname = "accept_ra_rt_info_min_plen", 6243 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6244 .maxlen = sizeof(int), 6245 .mode = 0644, 6246 .proc_handler = proc_dointvec, 6247 }, 6248 { 6249 .procname = "accept_ra_rt_info_max_plen", 6250 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6251 .maxlen = sizeof(int), 6252 .mode = 0644, 6253 .proc_handler = proc_dointvec, 6254 }, 6255 #endif 6256 #endif 6257 { 6258 .procname = "proxy_ndp", 6259 .data = &ipv6_devconf.proxy_ndp, 6260 .maxlen = sizeof(int), 6261 .mode = 0644, 6262 .proc_handler = addrconf_sysctl_proxy_ndp, 6263 }, 6264 { 6265 .procname = "accept_source_route", 6266 .data = &ipv6_devconf.accept_source_route, 6267 .maxlen = sizeof(int), 6268 .mode = 0644, 6269 .proc_handler = proc_dointvec, 6270 }, 6271 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6272 { 6273 .procname = "optimistic_dad", 6274 .data = &ipv6_devconf.optimistic_dad, 6275 .maxlen = sizeof(int), 6276 .mode = 0644, 6277 .proc_handler = proc_dointvec, 6278 }, 6279 { 6280 .procname = "use_optimistic", 6281 .data = &ipv6_devconf.use_optimistic, 6282 .maxlen = sizeof(int), 6283 .mode = 0644, 6284 .proc_handler = proc_dointvec, 6285 }, 6286 #endif 6287 #ifdef CONFIG_IPV6_MROUTE 6288 { 6289 .procname = "mc_forwarding", 6290 .data = &ipv6_devconf.mc_forwarding, 6291 .maxlen = sizeof(int), 6292 .mode = 0444, 6293 .proc_handler = proc_dointvec, 6294 }, 6295 #endif 6296 { 6297 .procname = "disable_ipv6", 6298 .data = &ipv6_devconf.disable_ipv6, 6299 .maxlen = sizeof(int), 6300 .mode = 0644, 6301 .proc_handler = addrconf_sysctl_disable, 6302 }, 6303 { 6304 .procname = "accept_dad", 6305 .data = &ipv6_devconf.accept_dad, 6306 .maxlen = sizeof(int), 6307 .mode = 0644, 6308 .proc_handler = proc_dointvec, 6309 }, 6310 { 6311 .procname = "force_tllao", 6312 .data = &ipv6_devconf.force_tllao, 6313 .maxlen = sizeof(int), 6314 .mode = 0644, 6315 .proc_handler = proc_dointvec 6316 }, 6317 { 6318 .procname = "ndisc_notify", 6319 .data = &ipv6_devconf.ndisc_notify, 6320 .maxlen = sizeof(int), 6321 .mode = 0644, 6322 .proc_handler = proc_dointvec 6323 }, 6324 { 6325 .procname = "suppress_frag_ndisc", 6326 .data = &ipv6_devconf.suppress_frag_ndisc, 6327 .maxlen = sizeof(int), 6328 .mode = 0644, 6329 .proc_handler = proc_dointvec 6330 }, 6331 { 6332 .procname = "accept_ra_from_local", 6333 .data = &ipv6_devconf.accept_ra_from_local, 6334 .maxlen = sizeof(int), 6335 .mode = 0644, 6336 .proc_handler = proc_dointvec, 6337 }, 6338 { 6339 .procname = "accept_ra_mtu", 6340 .data = &ipv6_devconf.accept_ra_mtu, 6341 .maxlen = sizeof(int), 6342 .mode = 0644, 6343 .proc_handler = proc_dointvec, 6344 }, 6345 { 6346 .procname = "stable_secret", 6347 .data = &ipv6_devconf.stable_secret, 6348 .maxlen = IPV6_MAX_STRLEN, 6349 .mode = 0600, 6350 .proc_handler = addrconf_sysctl_stable_secret, 6351 }, 6352 { 6353 .procname = "use_oif_addrs_only", 6354 .data = &ipv6_devconf.use_oif_addrs_only, 6355 .maxlen = sizeof(int), 6356 .mode = 0644, 6357 .proc_handler = proc_dointvec, 6358 }, 6359 { 6360 .procname = "ignore_routes_with_linkdown", 6361 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6362 .maxlen = sizeof(int), 6363 .mode = 0644, 6364 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6365 }, 6366 { 6367 .procname = "drop_unicast_in_l2_multicast", 6368 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6369 .maxlen = sizeof(int), 6370 .mode = 0644, 6371 .proc_handler = proc_dointvec, 6372 }, 6373 { 6374 .procname = "drop_unsolicited_na", 6375 .data = &ipv6_devconf.drop_unsolicited_na, 6376 .maxlen = sizeof(int), 6377 .mode = 0644, 6378 .proc_handler = proc_dointvec, 6379 }, 6380 { 6381 .procname = "keep_addr_on_down", 6382 .data = &ipv6_devconf.keep_addr_on_down, 6383 .maxlen = sizeof(int), 6384 .mode = 0644, 6385 .proc_handler = proc_dointvec, 6386 6387 }, 6388 { 6389 .procname = "seg6_enabled", 6390 .data = &ipv6_devconf.seg6_enabled, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec, 6394 }, 6395 #ifdef CONFIG_IPV6_SEG6_HMAC 6396 { 6397 .procname = "seg6_require_hmac", 6398 .data = &ipv6_devconf.seg6_require_hmac, 6399 .maxlen = sizeof(int), 6400 .mode = 0644, 6401 .proc_handler = proc_dointvec, 6402 }, 6403 #endif 6404 { 6405 .procname = "enhanced_dad", 6406 .data = &ipv6_devconf.enhanced_dad, 6407 .maxlen = sizeof(int), 6408 .mode = 0644, 6409 .proc_handler = proc_dointvec, 6410 }, 6411 { 6412 .procname = "addr_gen_mode", 6413 .data = &ipv6_devconf.addr_gen_mode, 6414 .maxlen = sizeof(int), 6415 .mode = 0644, 6416 .proc_handler = addrconf_sysctl_addr_gen_mode, 6417 }, 6418 { 6419 .procname = "disable_policy", 6420 .data = &ipv6_devconf.disable_policy, 6421 .maxlen = sizeof(int), 6422 .mode = 0644, 6423 .proc_handler = addrconf_sysctl_disable_policy, 6424 }, 6425 { 6426 .procname = "ndisc_tclass", 6427 .data = &ipv6_devconf.ndisc_tclass, 6428 .maxlen = sizeof(int), 6429 .mode = 0644, 6430 .proc_handler = proc_dointvec_minmax, 6431 .extra1 = (void *)&zero, 6432 .extra2 = (void *)&two_five_five, 6433 }, 6434 { 6435 /* sentinel */ 6436 } 6437 }; 6438 6439 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6440 struct inet6_dev *idev, struct ipv6_devconf *p) 6441 { 6442 int i, ifindex; 6443 struct ctl_table *table; 6444 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6445 6446 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6447 if (!table) 6448 goto out; 6449 6450 for (i = 0; table[i].data; i++) { 6451 table[i].data += (char *)p - (char *)&ipv6_devconf; 6452 /* If one of these is already set, then it is not safe to 6453 * overwrite either of them: this makes proc_dointvec_minmax 6454 * usable. 6455 */ 6456 if (!table[i].extra1 && !table[i].extra2) { 6457 table[i].extra1 = idev; /* embedded; no ref */ 6458 table[i].extra2 = net; 6459 } 6460 } 6461 6462 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6463 6464 p->sysctl_header = register_net_sysctl(net, path, table); 6465 if (!p->sysctl_header) 6466 goto free; 6467 6468 if (!strcmp(dev_name, "all")) 6469 ifindex = NETCONFA_IFINDEX_ALL; 6470 else if (!strcmp(dev_name, "default")) 6471 ifindex = NETCONFA_IFINDEX_DEFAULT; 6472 else 6473 ifindex = idev->dev->ifindex; 6474 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6475 ifindex, p); 6476 return 0; 6477 6478 free: 6479 kfree(table); 6480 out: 6481 return -ENOBUFS; 6482 } 6483 6484 static void __addrconf_sysctl_unregister(struct net *net, 6485 struct ipv6_devconf *p, int ifindex) 6486 { 6487 struct ctl_table *table; 6488 6489 if (!p->sysctl_header) 6490 return; 6491 6492 table = p->sysctl_header->ctl_table_arg; 6493 unregister_net_sysctl_table(p->sysctl_header); 6494 p->sysctl_header = NULL; 6495 kfree(table); 6496 6497 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6498 } 6499 6500 static int addrconf_sysctl_register(struct inet6_dev *idev) 6501 { 6502 int err; 6503 6504 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6505 return -EINVAL; 6506 6507 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6508 &ndisc_ifinfo_sysctl_change); 6509 if (err) 6510 return err; 6511 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6512 idev, &idev->cnf); 6513 if (err) 6514 neigh_sysctl_unregister(idev->nd_parms); 6515 6516 return err; 6517 } 6518 6519 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6520 { 6521 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6522 idev->dev->ifindex); 6523 neigh_sysctl_unregister(idev->nd_parms); 6524 } 6525 6526 6527 #endif 6528 6529 static int __net_init addrconf_init_net(struct net *net) 6530 { 6531 int err = -ENOMEM; 6532 struct ipv6_devconf *all, *dflt; 6533 6534 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6535 if (!all) 6536 goto err_alloc_all; 6537 6538 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6539 if (!dflt) 6540 goto err_alloc_dflt; 6541 6542 /* these will be inherited by all namespaces */ 6543 dflt->autoconf = ipv6_defaults.autoconf; 6544 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6545 6546 dflt->stable_secret.initialized = false; 6547 all->stable_secret.initialized = false; 6548 6549 net->ipv6.devconf_all = all; 6550 net->ipv6.devconf_dflt = dflt; 6551 6552 #ifdef CONFIG_SYSCTL 6553 err = __addrconf_sysctl_register(net, "all", NULL, all); 6554 if (err < 0) 6555 goto err_reg_all; 6556 6557 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6558 if (err < 0) 6559 goto err_reg_dflt; 6560 #endif 6561 return 0; 6562 6563 #ifdef CONFIG_SYSCTL 6564 err_reg_dflt: 6565 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6566 err_reg_all: 6567 kfree(dflt); 6568 #endif 6569 err_alloc_dflt: 6570 kfree(all); 6571 err_alloc_all: 6572 return err; 6573 } 6574 6575 static void __net_exit addrconf_exit_net(struct net *net) 6576 { 6577 #ifdef CONFIG_SYSCTL 6578 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6579 NETCONFA_IFINDEX_DEFAULT); 6580 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6581 NETCONFA_IFINDEX_ALL); 6582 #endif 6583 kfree(net->ipv6.devconf_dflt); 6584 kfree(net->ipv6.devconf_all); 6585 } 6586 6587 static struct pernet_operations addrconf_ops = { 6588 .init = addrconf_init_net, 6589 .exit = addrconf_exit_net, 6590 }; 6591 6592 static struct rtnl_af_ops inet6_ops __read_mostly = { 6593 .family = AF_INET6, 6594 .fill_link_af = inet6_fill_link_af, 6595 .get_link_af_size = inet6_get_link_af_size, 6596 .validate_link_af = inet6_validate_link_af, 6597 .set_link_af = inet6_set_link_af, 6598 }; 6599 6600 /* 6601 * Init / cleanup code 6602 */ 6603 6604 int __init addrconf_init(void) 6605 { 6606 struct inet6_dev *idev; 6607 int i, err; 6608 6609 err = ipv6_addr_label_init(); 6610 if (err < 0) { 6611 pr_crit("%s: cannot initialize default policy table: %d\n", 6612 __func__, err); 6613 goto out; 6614 } 6615 6616 err = register_pernet_subsys(&addrconf_ops); 6617 if (err < 0) 6618 goto out_addrlabel; 6619 6620 addrconf_wq = create_workqueue("ipv6_addrconf"); 6621 if (!addrconf_wq) { 6622 err = -ENOMEM; 6623 goto out_nowq; 6624 } 6625 6626 /* The addrconf netdev notifier requires that loopback_dev 6627 * has it's ipv6 private information allocated and setup 6628 * before it can bring up and give link-local addresses 6629 * to other devices which are up. 6630 * 6631 * Unfortunately, loopback_dev is not necessarily the first 6632 * entry in the global dev_base list of net devices. In fact, 6633 * it is likely to be the very last entry on that list. 6634 * So this causes the notifier registry below to try and 6635 * give link-local addresses to all devices besides loopback_dev 6636 * first, then loopback_dev, which cases all the non-loopback_dev 6637 * devices to fail to get a link-local address. 6638 * 6639 * So, as a temporary fix, allocate the ipv6 structure for 6640 * loopback_dev first by hand. 6641 * Longer term, all of the dependencies ipv6 has upon the loopback 6642 * device and it being up should be removed. 6643 */ 6644 rtnl_lock(); 6645 idev = ipv6_add_dev(init_net.loopback_dev); 6646 rtnl_unlock(); 6647 if (IS_ERR(idev)) { 6648 err = PTR_ERR(idev); 6649 goto errlo; 6650 } 6651 6652 ip6_route_init_special_entries(); 6653 6654 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6655 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6656 6657 register_netdevice_notifier(&ipv6_dev_notf); 6658 6659 addrconf_verify(); 6660 6661 rtnl_af_register(&inet6_ops); 6662 6663 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6664 NULL, inet6_dump_ifinfo, 0); 6665 if (err < 0) 6666 goto errout; 6667 6668 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6669 inet6_rtm_newaddr, NULL, 0); 6670 if (err < 0) 6671 goto errout; 6672 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6673 inet6_rtm_deladdr, NULL, 0); 6674 if (err < 0) 6675 goto errout; 6676 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6677 inet6_rtm_getaddr, inet6_dump_ifaddr, 6678 RTNL_FLAG_DOIT_UNLOCKED); 6679 if (err < 0) 6680 goto errout; 6681 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6682 NULL, inet6_dump_ifmcaddr, 0); 6683 if (err < 0) 6684 goto errout; 6685 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6686 NULL, inet6_dump_ifacaddr, 0); 6687 if (err < 0) 6688 goto errout; 6689 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6690 inet6_netconf_get_devconf, 6691 inet6_netconf_dump_devconf, 6692 RTNL_FLAG_DOIT_UNLOCKED); 6693 if (err < 0) 6694 goto errout; 6695 err = ipv6_addr_label_rtnl_register(); 6696 if (err < 0) 6697 goto errout; 6698 6699 return 0; 6700 errout: 6701 rtnl_unregister_all(PF_INET6); 6702 rtnl_af_unregister(&inet6_ops); 6703 unregister_netdevice_notifier(&ipv6_dev_notf); 6704 errlo: 6705 destroy_workqueue(addrconf_wq); 6706 out_nowq: 6707 unregister_pernet_subsys(&addrconf_ops); 6708 out_addrlabel: 6709 ipv6_addr_label_cleanup(); 6710 out: 6711 return err; 6712 } 6713 6714 void addrconf_cleanup(void) 6715 { 6716 struct net_device *dev; 6717 int i; 6718 6719 unregister_netdevice_notifier(&ipv6_dev_notf); 6720 unregister_pernet_subsys(&addrconf_ops); 6721 ipv6_addr_label_cleanup(); 6722 6723 rtnl_af_unregister(&inet6_ops); 6724 6725 rtnl_lock(); 6726 6727 /* clean dev list */ 6728 for_each_netdev(&init_net, dev) { 6729 if (__in6_dev_get(dev) == NULL) 6730 continue; 6731 addrconf_ifdown(dev, 1); 6732 } 6733 addrconf_ifdown(init_net.loopback_dev, 2); 6734 6735 /* 6736 * Check hash table. 6737 */ 6738 spin_lock_bh(&addrconf_hash_lock); 6739 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6740 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6741 spin_unlock_bh(&addrconf_hash_lock); 6742 cancel_delayed_work(&addr_chk_work); 6743 rtnl_unlock(); 6744 6745 destroy_workqueue(addrconf_wq); 6746 } 6747