1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 else 389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 393 if (!ndev->nd_parms) { 394 kfree(ndev); 395 return ERR_PTR(err); 396 } 397 if (ndev->cnf.forwarding) 398 dev_disable_lro(dev); 399 /* We refer to the device */ 400 dev_hold(dev); 401 402 if (snmp6_alloc_dev(ndev) < 0) { 403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 404 __func__); 405 neigh_parms_release(&nd_tbl, ndev->nd_parms); 406 dev_put(dev); 407 kfree(ndev); 408 return ERR_PTR(err); 409 } 410 411 if (snmp6_register_dev(ndev) < 0) { 412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 413 __func__, dev->name); 414 goto err_release; 415 } 416 417 /* One reference from device. */ 418 refcount_set(&ndev->refcnt, 1); 419 420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 421 ndev->cnf.accept_dad = -1; 422 423 #if IS_ENABLED(CONFIG_IPV6_SIT) 424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 425 pr_info("%s: Disabled Multicast RS\n", dev->name); 426 ndev->cnf.rtr_solicits = 0; 427 } 428 #endif 429 430 INIT_LIST_HEAD(&ndev->tempaddr_list); 431 ndev->desync_factor = U32_MAX; 432 if ((dev->flags&IFF_LOOPBACK) || 433 dev->type == ARPHRD_TUNNEL || 434 dev->type == ARPHRD_TUNNEL6 || 435 dev->type == ARPHRD_SIT || 436 dev->type == ARPHRD_NONE) { 437 ndev->cnf.use_tempaddr = -1; 438 } else 439 ipv6_regen_rndid(ndev); 440 441 ndev->token = in6addr_any; 442 443 if (netif_running(dev) && addrconf_link_ready(dev)) 444 ndev->if_flags |= IF_READY; 445 446 ipv6_mc_init_dev(ndev); 447 ndev->tstamp = jiffies; 448 err = addrconf_sysctl_register(ndev); 449 if (err) { 450 ipv6_mc_destroy_dev(ndev); 451 snmp6_unregister_dev(ndev); 452 goto err_release; 453 } 454 /* protected by rtnl_lock */ 455 rcu_assign_pointer(dev->ip6_ptr, ndev); 456 457 /* Join interface-local all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 459 460 /* Join all-node multicast group */ 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 462 463 /* Join all-router multicast group if forwarding is set */ 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 467 return ndev; 468 469 err_release: 470 neigh_parms_release(&nd_tbl, ndev->nd_parms); 471 ndev->dead = 1; 472 in6_dev_finish_destroy(ndev); 473 return ERR_PTR(err); 474 } 475 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 477 { 478 struct inet6_dev *idev; 479 480 ASSERT_RTNL(); 481 482 idev = __in6_dev_get(dev); 483 if (!idev) { 484 idev = ipv6_add_dev(dev); 485 if (IS_ERR(idev)) 486 return NULL; 487 } 488 489 if (dev->flags&IFF_UP) 490 ipv6_mc_up(idev); 491 return idev; 492 } 493 494 static int inet6_netconf_msgsize_devconf(int type) 495 { 496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 497 + nla_total_size(4); /* NETCONFA_IFINDEX */ 498 bool all = false; 499 500 if (type == NETCONFA_ALL) 501 all = true; 502 503 if (all || type == NETCONFA_FORWARDING) 504 size += nla_total_size(4); 505 #ifdef CONFIG_IPV6_MROUTE 506 if (all || type == NETCONFA_MC_FORWARDING) 507 size += nla_total_size(4); 508 #endif 509 if (all || type == NETCONFA_PROXY_NEIGH) 510 size += nla_total_size(4); 511 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 513 size += nla_total_size(4); 514 515 return size; 516 } 517 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 519 struct ipv6_devconf *devconf, u32 portid, 520 u32 seq, int event, unsigned int flags, 521 int type) 522 { 523 struct nlmsghdr *nlh; 524 struct netconfmsg *ncm; 525 bool all = false; 526 527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 528 flags); 529 if (!nlh) 530 return -EMSGSIZE; 531 532 if (type == NETCONFA_ALL) 533 all = true; 534 535 ncm = nlmsg_data(nlh); 536 ncm->ncm_family = AF_INET6; 537 538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 539 goto nla_put_failure; 540 541 if (!devconf) 542 goto out; 543 544 if ((all || type == NETCONFA_FORWARDING) && 545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 546 goto nla_put_failure; 547 #ifdef CONFIG_IPV6_MROUTE 548 if ((all || type == NETCONFA_MC_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 550 devconf->mc_forwarding) < 0) 551 goto nla_put_failure; 552 #endif 553 if ((all || type == NETCONFA_PROXY_NEIGH) && 554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 555 goto nla_put_failure; 556 557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 559 devconf->ignore_routes_with_linkdown) < 0) 560 goto nla_put_failure; 561 562 out: 563 nlmsg_end(skb, nlh); 564 return 0; 565 566 nla_put_failure: 567 nlmsg_cancel(skb, nlh); 568 return -EMSGSIZE; 569 } 570 571 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 572 int ifindex, struct ipv6_devconf *devconf) 573 { 574 struct sk_buff *skb; 575 int err = -ENOBUFS; 576 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 578 if (!skb) 579 goto errout; 580 581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 582 event, 0, type); 583 if (err < 0) { 584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 585 WARN_ON(err == -EMSGSIZE); 586 kfree_skb(skb); 587 goto errout; 588 } 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 590 return; 591 errout: 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 593 } 594 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 596 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 597 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 600 }; 601 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 603 struct nlmsghdr *nlh, 604 struct netlink_ext_ack *extack) 605 { 606 struct net *net = sock_net(in_skb->sk); 607 struct nlattr *tb[NETCONFA_MAX+1]; 608 struct inet6_dev *in6_dev = NULL; 609 struct net_device *dev = NULL; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 int ifindex; 614 int err; 615 616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 617 devconf_ipv6_policy, extack); 618 if (err < 0) 619 return err; 620 621 if (!tb[NETCONFA_IFINDEX]) 622 return -EINVAL; 623 624 err = -EINVAL; 625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 626 switch (ifindex) { 627 case NETCONFA_IFINDEX_ALL: 628 devconf = net->ipv6.devconf_all; 629 break; 630 case NETCONFA_IFINDEX_DEFAULT: 631 devconf = net->ipv6.devconf_dflt; 632 break; 633 default: 634 dev = dev_get_by_index(net, ifindex); 635 if (!dev) 636 return -EINVAL; 637 in6_dev = in6_dev_get(dev); 638 if (!in6_dev) 639 goto errout; 640 devconf = &in6_dev->cnf; 641 break; 642 } 643 644 err = -ENOBUFS; 645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 646 if (!skb) 647 goto errout; 648 649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 650 NETLINK_CB(in_skb).portid, 651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 652 NETCONFA_ALL); 653 if (err < 0) { 654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 655 WARN_ON(err == -EMSGSIZE); 656 kfree_skb(skb); 657 goto errout; 658 } 659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 660 errout: 661 if (in6_dev) 662 in6_dev_put(in6_dev); 663 if (dev) 664 dev_put(dev); 665 return err; 666 } 667 668 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 669 struct netlink_callback *cb) 670 { 671 struct net *net = sock_net(skb->sk); 672 int h, s_h; 673 int idx, s_idx; 674 struct net_device *dev; 675 struct inet6_dev *idev; 676 struct hlist_head *head; 677 678 s_h = cb->args[0]; 679 s_idx = idx = cb->args[1]; 680 681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 682 idx = 0; 683 head = &net->dev_index_head[h]; 684 rcu_read_lock(); 685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 686 net->dev_base_seq; 687 hlist_for_each_entry_rcu(dev, head, index_hlist) { 688 if (idx < s_idx) 689 goto cont; 690 idev = __in6_dev_get(dev); 691 if (!idev) 692 goto cont; 693 694 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 695 &idev->cnf, 696 NETLINK_CB(cb->skb).portid, 697 cb->nlh->nlmsg_seq, 698 RTM_NEWNETCONF, 699 NLM_F_MULTI, 700 NETCONFA_ALL) < 0) { 701 rcu_read_unlock(); 702 goto done; 703 } 704 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 705 cont: 706 idx++; 707 } 708 rcu_read_unlock(); 709 } 710 if (h == NETDEV_HASHENTRIES) { 711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 712 net->ipv6.devconf_all, 713 NETLINK_CB(cb->skb).portid, 714 cb->nlh->nlmsg_seq, 715 RTM_NEWNETCONF, NLM_F_MULTI, 716 NETCONFA_ALL) < 0) 717 goto done; 718 else 719 h++; 720 } 721 if (h == NETDEV_HASHENTRIES + 1) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 723 net->ipv6.devconf_dflt, 724 NETLINK_CB(cb->skb).portid, 725 cb->nlh->nlmsg_seq, 726 RTM_NEWNETCONF, NLM_F_MULTI, 727 NETCONFA_ALL) < 0) 728 goto done; 729 else 730 h++; 731 } 732 done: 733 cb->args[0] = h; 734 cb->args[1] = idx; 735 736 return skb->len; 737 } 738 739 #ifdef CONFIG_SYSCTL 740 static void dev_forward_change(struct inet6_dev *idev) 741 { 742 struct net_device *dev; 743 struct inet6_ifaddr *ifa; 744 745 if (!idev) 746 return; 747 dev = idev->dev; 748 if (idev->cnf.forwarding) 749 dev_disable_lro(dev); 750 if (dev->flags & IFF_MULTICAST) { 751 if (idev->cnf.forwarding) { 752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 755 } else { 756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 759 } 760 } 761 762 list_for_each_entry(ifa, &idev->addr_list, if_list) { 763 if (ifa->flags&IFA_F_TENTATIVE) 764 continue; 765 if (idev->cnf.forwarding) 766 addrconf_join_anycast(ifa); 767 else 768 addrconf_leave_anycast(ifa); 769 } 770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 771 NETCONFA_FORWARDING, 772 dev->ifindex, &idev->cnf); 773 } 774 775 776 static void addrconf_forward_change(struct net *net, __s32 newf) 777 { 778 struct net_device *dev; 779 struct inet6_dev *idev; 780 781 for_each_netdev(net, dev) { 782 idev = __in6_dev_get(dev); 783 if (idev) { 784 int changed = (!idev->cnf.forwarding) ^ (!newf); 785 idev->cnf.forwarding = newf; 786 if (changed) 787 dev_forward_change(idev); 788 } 789 } 790 } 791 792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 793 { 794 struct net *net; 795 int old; 796 797 if (!rtnl_trylock()) 798 return restart_syscall(); 799 800 net = (struct net *)table->extra2; 801 old = *p; 802 *p = newf; 803 804 if (p == &net->ipv6.devconf_dflt->forwarding) { 805 if ((!newf) ^ (!old)) 806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 807 NETCONFA_FORWARDING, 808 NETCONFA_IFINDEX_DEFAULT, 809 net->ipv6.devconf_dflt); 810 rtnl_unlock(); 811 return 0; 812 } 813 814 if (p == &net->ipv6.devconf_all->forwarding) { 815 int old_dflt = net->ipv6.devconf_dflt->forwarding; 816 817 net->ipv6.devconf_dflt->forwarding = newf; 818 if ((!newf) ^ (!old_dflt)) 819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 820 NETCONFA_FORWARDING, 821 NETCONFA_IFINDEX_DEFAULT, 822 net->ipv6.devconf_dflt); 823 824 addrconf_forward_change(net, newf); 825 if ((!newf) ^ (!old)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_ALL, 829 net->ipv6.devconf_all); 830 } else if ((!newf) ^ (!old)) 831 dev_forward_change((struct inet6_dev *)table->extra1); 832 rtnl_unlock(); 833 834 if (newf) 835 rt6_purge_dflt_routers(net); 836 return 1; 837 } 838 839 static void addrconf_linkdown_change(struct net *net, __s32 newf) 840 { 841 struct net_device *dev; 842 struct inet6_dev *idev; 843 844 for_each_netdev(net, dev) { 845 idev = __in6_dev_get(dev); 846 if (idev) { 847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 848 849 idev->cnf.ignore_routes_with_linkdown = newf; 850 if (changed) 851 inet6_netconf_notify_devconf(dev_net(dev), 852 RTM_NEWNETCONF, 853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 854 dev->ifindex, 855 &idev->cnf); 856 } 857 } 858 } 859 860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 861 { 862 struct net *net; 863 int old; 864 865 if (!rtnl_trylock()) 866 return restart_syscall(); 867 868 net = (struct net *)table->extra2; 869 old = *p; 870 *p = newf; 871 872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, 875 RTM_NEWNETCONF, 876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 877 NETCONFA_IFINDEX_DEFAULT, 878 net->ipv6.devconf_dflt); 879 rtnl_unlock(); 880 return 0; 881 } 882 883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 885 addrconf_linkdown_change(net, newf); 886 if ((!newf) ^ (!old)) 887 inet6_netconf_notify_devconf(net, 888 RTM_NEWNETCONF, 889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 890 NETCONFA_IFINDEX_ALL, 891 net->ipv6.devconf_all); 892 } 893 rtnl_unlock(); 894 895 return 1; 896 } 897 898 #endif 899 900 /* Nobody refers to this ifaddr, destroy it */ 901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 902 { 903 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 904 905 #ifdef NET_REFCNT_DEBUG 906 pr_debug("%s\n", __func__); 907 #endif 908 909 in6_dev_put(ifp->idev); 910 911 if (cancel_delayed_work(&ifp->dad_work)) 912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 913 ifp); 914 915 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 916 pr_warn("Freeing alive inet6 address %p\n", ifp); 917 return; 918 } 919 920 kfree_rcu(ifp, rcu); 921 } 922 923 static void 924 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 925 { 926 struct list_head *p; 927 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 928 929 /* 930 * Each device address list is sorted in order of scope - 931 * global before linklocal. 932 */ 933 list_for_each(p, &idev->addr_list) { 934 struct inet6_ifaddr *ifa 935 = list_entry(p, struct inet6_ifaddr, if_list); 936 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 937 break; 938 } 939 940 list_add_tail_rcu(&ifp->if_list, p); 941 } 942 943 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 944 { 945 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 946 947 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 948 } 949 950 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 951 struct net_device *dev, unsigned int hash) 952 { 953 struct inet6_ifaddr *ifp; 954 955 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 956 if (!net_eq(dev_net(ifp->idev->dev), net)) 957 continue; 958 if (ipv6_addr_equal(&ifp->addr, addr)) { 959 if (!dev || ifp->idev->dev == dev) 960 return true; 961 } 962 } 963 return false; 964 } 965 966 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 967 { 968 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 969 int err = 0; 970 971 spin_lock(&addrconf_hash_lock); 972 973 /* Ignore adding duplicate addresses on an interface */ 974 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 975 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 976 err = -EEXIST; 977 } else { 978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 979 } 980 981 spin_unlock(&addrconf_hash_lock); 982 983 return err; 984 } 985 986 /* On success it returns ifp with increased reference count */ 987 988 static struct inet6_ifaddr * 989 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 990 bool can_block, struct netlink_ext_ack *extack) 991 { 992 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 993 int addr_type = ipv6_addr_type(cfg->pfx); 994 struct net *net = dev_net(idev->dev); 995 struct inet6_ifaddr *ifa = NULL; 996 struct fib6_info *f6i = NULL; 997 int err = 0; 998 999 if (addr_type == IPV6_ADDR_ANY || 1000 addr_type & IPV6_ADDR_MULTICAST || 1001 (!(idev->dev->flags & IFF_LOOPBACK) && 1002 addr_type & IPV6_ADDR_LOOPBACK)) 1003 return ERR_PTR(-EADDRNOTAVAIL); 1004 1005 if (idev->dead) { 1006 err = -ENODEV; /*XXX*/ 1007 goto out; 1008 } 1009 1010 if (idev->cnf.disable_ipv6) { 1011 err = -EACCES; 1012 goto out; 1013 } 1014 1015 /* validator notifier needs to be blocking; 1016 * do not call in atomic context 1017 */ 1018 if (can_block) { 1019 struct in6_validator_info i6vi = { 1020 .i6vi_addr = *cfg->pfx, 1021 .i6vi_dev = idev, 1022 .extack = extack, 1023 }; 1024 1025 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1026 err = notifier_to_errno(err); 1027 if (err < 0) 1028 goto out; 1029 } 1030 1031 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1032 if (!ifa) { 1033 err = -ENOBUFS; 1034 goto out; 1035 } 1036 1037 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1038 if (IS_ERR(f6i)) { 1039 err = PTR_ERR(f6i); 1040 f6i = NULL; 1041 goto out; 1042 } 1043 1044 if (net->ipv6.devconf_all->disable_policy || 1045 idev->cnf.disable_policy) 1046 f6i->dst_nopolicy = true; 1047 1048 neigh_parms_data_state_setall(idev->nd_parms); 1049 1050 ifa->addr = *cfg->pfx; 1051 if (cfg->peer_pfx) 1052 ifa->peer_addr = *cfg->peer_pfx; 1053 1054 spin_lock_init(&ifa->lock); 1055 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1056 INIT_HLIST_NODE(&ifa->addr_lst); 1057 ifa->scope = cfg->scope; 1058 ifa->prefix_len = cfg->plen; 1059 ifa->rt_priority = cfg->rt_priority; 1060 ifa->flags = cfg->ifa_flags; 1061 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1062 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1063 ifa->flags |= IFA_F_TENTATIVE; 1064 ifa->valid_lft = cfg->valid_lft; 1065 ifa->prefered_lft = cfg->preferred_lft; 1066 ifa->cstamp = ifa->tstamp = jiffies; 1067 ifa->tokenized = false; 1068 1069 ifa->rt = f6i; 1070 1071 ifa->idev = idev; 1072 in6_dev_hold(idev); 1073 1074 /* For caller */ 1075 refcount_set(&ifa->refcnt, 1); 1076 1077 rcu_read_lock_bh(); 1078 1079 err = ipv6_add_addr_hash(idev->dev, ifa); 1080 if (err < 0) { 1081 rcu_read_unlock_bh(); 1082 goto out; 1083 } 1084 1085 write_lock(&idev->lock); 1086 1087 /* Add to inet6_dev unicast addr list. */ 1088 ipv6_link_dev_addr(idev, ifa); 1089 1090 if (ifa->flags&IFA_F_TEMPORARY) { 1091 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1092 in6_ifa_hold(ifa); 1093 } 1094 1095 in6_ifa_hold(ifa); 1096 write_unlock(&idev->lock); 1097 1098 rcu_read_unlock_bh(); 1099 1100 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1101 out: 1102 if (unlikely(err < 0)) { 1103 fib6_info_release(f6i); 1104 1105 if (ifa) { 1106 if (ifa->idev) 1107 in6_dev_put(ifa->idev); 1108 kfree(ifa); 1109 } 1110 ifa = ERR_PTR(err); 1111 } 1112 1113 return ifa; 1114 } 1115 1116 enum cleanup_prefix_rt_t { 1117 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1118 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1119 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1120 }; 1121 1122 /* 1123 * Check, whether the prefix for ifp would still need a prefix route 1124 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1125 * constants. 1126 * 1127 * 1) we don't purge prefix if address was not permanent. 1128 * prefix is managed by its own lifetime. 1129 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1130 * 3) if there are no addresses, delete prefix. 1131 * 4) if there are still other permanent address(es), 1132 * corresponding prefix is still permanent. 1133 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1134 * don't purge the prefix, assume user space is managing it. 1135 * 6) otherwise, update prefix lifetime to the 1136 * longest valid lifetime among the corresponding 1137 * addresses on the device. 1138 * Note: subsequent RA will update lifetime. 1139 **/ 1140 static enum cleanup_prefix_rt_t 1141 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1142 { 1143 struct inet6_ifaddr *ifa; 1144 struct inet6_dev *idev = ifp->idev; 1145 unsigned long lifetime; 1146 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1147 1148 *expires = jiffies; 1149 1150 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1151 if (ifa == ifp) 1152 continue; 1153 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1154 ifp->prefix_len)) 1155 continue; 1156 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1157 return CLEANUP_PREFIX_RT_NOP; 1158 1159 action = CLEANUP_PREFIX_RT_EXPIRE; 1160 1161 spin_lock(&ifa->lock); 1162 1163 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1164 /* 1165 * Note: Because this address is 1166 * not permanent, lifetime < 1167 * LONG_MAX / HZ here. 1168 */ 1169 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1170 *expires = ifa->tstamp + lifetime * HZ; 1171 spin_unlock(&ifa->lock); 1172 } 1173 1174 return action; 1175 } 1176 1177 static void 1178 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1179 { 1180 struct fib6_info *f6i; 1181 1182 f6i = addrconf_get_prefix_route(&ifp->addr, 1183 ifp->prefix_len, 1184 ifp->idev->dev, 1185 0, RTF_GATEWAY | RTF_DEFAULT); 1186 if (f6i) { 1187 if (del_rt) 1188 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1189 else { 1190 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1191 fib6_set_expires(f6i, expires); 1192 fib6_info_release(f6i); 1193 } 1194 } 1195 } 1196 1197 1198 /* This function wants to get referenced ifp and releases it before return */ 1199 1200 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1201 { 1202 int state; 1203 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1204 unsigned long expires; 1205 1206 ASSERT_RTNL(); 1207 1208 spin_lock_bh(&ifp->lock); 1209 state = ifp->state; 1210 ifp->state = INET6_IFADDR_STATE_DEAD; 1211 spin_unlock_bh(&ifp->lock); 1212 1213 if (state == INET6_IFADDR_STATE_DEAD) 1214 goto out; 1215 1216 spin_lock_bh(&addrconf_hash_lock); 1217 hlist_del_init_rcu(&ifp->addr_lst); 1218 spin_unlock_bh(&addrconf_hash_lock); 1219 1220 write_lock_bh(&ifp->idev->lock); 1221 1222 if (ifp->flags&IFA_F_TEMPORARY) { 1223 list_del(&ifp->tmp_list); 1224 if (ifp->ifpub) { 1225 in6_ifa_put(ifp->ifpub); 1226 ifp->ifpub = NULL; 1227 } 1228 __in6_ifa_put(ifp); 1229 } 1230 1231 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1232 action = check_cleanup_prefix_route(ifp, &expires); 1233 1234 list_del_rcu(&ifp->if_list); 1235 __in6_ifa_put(ifp); 1236 1237 write_unlock_bh(&ifp->idev->lock); 1238 1239 addrconf_del_dad_work(ifp); 1240 1241 ipv6_ifa_notify(RTM_DELADDR, ifp); 1242 1243 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1244 1245 if (action != CLEANUP_PREFIX_RT_NOP) { 1246 cleanup_prefix_route(ifp, expires, 1247 action == CLEANUP_PREFIX_RT_DEL); 1248 } 1249 1250 /* clean up prefsrc entries */ 1251 rt6_remove_prefsrc(ifp); 1252 out: 1253 in6_ifa_put(ifp); 1254 } 1255 1256 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1257 struct inet6_ifaddr *ift, 1258 bool block) 1259 { 1260 struct inet6_dev *idev = ifp->idev; 1261 struct in6_addr addr, *tmpaddr; 1262 unsigned long tmp_tstamp, age; 1263 unsigned long regen_advance; 1264 struct ifa6_config cfg; 1265 int ret = 0; 1266 unsigned long now = jiffies; 1267 long max_desync_factor; 1268 s32 cnf_temp_preferred_lft; 1269 1270 write_lock_bh(&idev->lock); 1271 if (ift) { 1272 spin_lock_bh(&ift->lock); 1273 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1274 spin_unlock_bh(&ift->lock); 1275 tmpaddr = &addr; 1276 } else { 1277 tmpaddr = NULL; 1278 } 1279 retry: 1280 in6_dev_hold(idev); 1281 if (idev->cnf.use_tempaddr <= 0) { 1282 write_unlock_bh(&idev->lock); 1283 pr_info("%s: use_tempaddr is disabled\n", __func__); 1284 in6_dev_put(idev); 1285 ret = -1; 1286 goto out; 1287 } 1288 spin_lock_bh(&ifp->lock); 1289 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1290 idev->cnf.use_tempaddr = -1; /*XXX*/ 1291 spin_unlock_bh(&ifp->lock); 1292 write_unlock_bh(&idev->lock); 1293 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1294 __func__); 1295 in6_dev_put(idev); 1296 ret = -1; 1297 goto out; 1298 } 1299 in6_ifa_hold(ifp); 1300 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1301 ipv6_try_regen_rndid(idev, tmpaddr); 1302 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1303 age = (now - ifp->tstamp) / HZ; 1304 1305 regen_advance = idev->cnf.regen_max_retry * 1306 idev->cnf.dad_transmits * 1307 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1308 1309 /* recalculate max_desync_factor each time and update 1310 * idev->desync_factor if it's larger 1311 */ 1312 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1313 max_desync_factor = min_t(__u32, 1314 idev->cnf.max_desync_factor, 1315 cnf_temp_preferred_lft - regen_advance); 1316 1317 if (unlikely(idev->desync_factor > max_desync_factor)) { 1318 if (max_desync_factor > 0) { 1319 get_random_bytes(&idev->desync_factor, 1320 sizeof(idev->desync_factor)); 1321 idev->desync_factor %= max_desync_factor; 1322 } else { 1323 idev->desync_factor = 0; 1324 } 1325 } 1326 1327 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1328 idev->cnf.temp_valid_lft + age); 1329 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1330 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1331 1332 cfg.plen = ifp->prefix_len; 1333 tmp_tstamp = ifp->tstamp; 1334 spin_unlock_bh(&ifp->lock); 1335 1336 write_unlock_bh(&idev->lock); 1337 1338 /* A temporary address is created only if this calculated Preferred 1339 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1340 * an implementation must not create a temporary address with a zero 1341 * Preferred Lifetime. 1342 * Use age calculation as in addrconf_verify to avoid unnecessary 1343 * temporary addresses being generated. 1344 */ 1345 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1346 if (cfg.preferred_lft <= regen_advance + age) { 1347 in6_ifa_put(ifp); 1348 in6_dev_put(idev); 1349 ret = -1; 1350 goto out; 1351 } 1352 1353 cfg.ifa_flags = IFA_F_TEMPORARY; 1354 /* set in addrconf_prefix_rcv() */ 1355 if (ifp->flags & IFA_F_OPTIMISTIC) 1356 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1357 1358 cfg.pfx = &addr; 1359 cfg.scope = ipv6_addr_scope(cfg.pfx); 1360 cfg.rt_priority = 0; 1361 1362 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1363 if (IS_ERR(ift)) { 1364 in6_ifa_put(ifp); 1365 in6_dev_put(idev); 1366 pr_info("%s: retry temporary address regeneration\n", __func__); 1367 tmpaddr = &addr; 1368 write_lock_bh(&idev->lock); 1369 goto retry; 1370 } 1371 1372 spin_lock_bh(&ift->lock); 1373 ift->ifpub = ifp; 1374 ift->cstamp = now; 1375 ift->tstamp = tmp_tstamp; 1376 spin_unlock_bh(&ift->lock); 1377 1378 addrconf_dad_start(ift); 1379 in6_ifa_put(ift); 1380 in6_dev_put(idev); 1381 out: 1382 return ret; 1383 } 1384 1385 /* 1386 * Choose an appropriate source address (RFC3484) 1387 */ 1388 enum { 1389 IPV6_SADDR_RULE_INIT = 0, 1390 IPV6_SADDR_RULE_LOCAL, 1391 IPV6_SADDR_RULE_SCOPE, 1392 IPV6_SADDR_RULE_PREFERRED, 1393 #ifdef CONFIG_IPV6_MIP6 1394 IPV6_SADDR_RULE_HOA, 1395 #endif 1396 IPV6_SADDR_RULE_OIF, 1397 IPV6_SADDR_RULE_LABEL, 1398 IPV6_SADDR_RULE_PRIVACY, 1399 IPV6_SADDR_RULE_ORCHID, 1400 IPV6_SADDR_RULE_PREFIX, 1401 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1402 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1403 #endif 1404 IPV6_SADDR_RULE_MAX 1405 }; 1406 1407 struct ipv6_saddr_score { 1408 int rule; 1409 int addr_type; 1410 struct inet6_ifaddr *ifa; 1411 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1412 int scopedist; 1413 int matchlen; 1414 }; 1415 1416 struct ipv6_saddr_dst { 1417 const struct in6_addr *addr; 1418 int ifindex; 1419 int scope; 1420 int label; 1421 unsigned int prefs; 1422 }; 1423 1424 static inline int ipv6_saddr_preferred(int type) 1425 { 1426 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1427 return 1; 1428 return 0; 1429 } 1430 1431 static bool ipv6_use_optimistic_addr(struct net *net, 1432 struct inet6_dev *idev) 1433 { 1434 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1435 if (!idev) 1436 return false; 1437 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1438 return false; 1439 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1440 return false; 1441 1442 return true; 1443 #else 1444 return false; 1445 #endif 1446 } 1447 1448 static bool ipv6_allow_optimistic_dad(struct net *net, 1449 struct inet6_dev *idev) 1450 { 1451 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1452 if (!idev) 1453 return false; 1454 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1455 return false; 1456 1457 return true; 1458 #else 1459 return false; 1460 #endif 1461 } 1462 1463 static int ipv6_get_saddr_eval(struct net *net, 1464 struct ipv6_saddr_score *score, 1465 struct ipv6_saddr_dst *dst, 1466 int i) 1467 { 1468 int ret; 1469 1470 if (i <= score->rule) { 1471 switch (i) { 1472 case IPV6_SADDR_RULE_SCOPE: 1473 ret = score->scopedist; 1474 break; 1475 case IPV6_SADDR_RULE_PREFIX: 1476 ret = score->matchlen; 1477 break; 1478 default: 1479 ret = !!test_bit(i, score->scorebits); 1480 } 1481 goto out; 1482 } 1483 1484 switch (i) { 1485 case IPV6_SADDR_RULE_INIT: 1486 /* Rule 0: remember if hiscore is not ready yet */ 1487 ret = !!score->ifa; 1488 break; 1489 case IPV6_SADDR_RULE_LOCAL: 1490 /* Rule 1: Prefer same address */ 1491 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1492 break; 1493 case IPV6_SADDR_RULE_SCOPE: 1494 /* Rule 2: Prefer appropriate scope 1495 * 1496 * ret 1497 * ^ 1498 * -1 | d 15 1499 * ---+--+-+---> scope 1500 * | 1501 * | d is scope of the destination. 1502 * B-d | \ 1503 * | \ <- smaller scope is better if 1504 * B-15 | \ if scope is enough for destination. 1505 * | ret = B - scope (-1 <= scope >= d <= 15). 1506 * d-C-1 | / 1507 * |/ <- greater is better 1508 * -C / if scope is not enough for destination. 1509 * /| ret = scope - C (-1 <= d < scope <= 15). 1510 * 1511 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1512 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1513 * Assume B = 0 and we get C > 29. 1514 */ 1515 ret = __ipv6_addr_src_scope(score->addr_type); 1516 if (ret >= dst->scope) 1517 ret = -ret; 1518 else 1519 ret -= 128; /* 30 is enough */ 1520 score->scopedist = ret; 1521 break; 1522 case IPV6_SADDR_RULE_PREFERRED: 1523 { 1524 /* Rule 3: Avoid deprecated and optimistic addresses */ 1525 u8 avoid = IFA_F_DEPRECATED; 1526 1527 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1528 avoid |= IFA_F_OPTIMISTIC; 1529 ret = ipv6_saddr_preferred(score->addr_type) || 1530 !(score->ifa->flags & avoid); 1531 break; 1532 } 1533 #ifdef CONFIG_IPV6_MIP6 1534 case IPV6_SADDR_RULE_HOA: 1535 { 1536 /* Rule 4: Prefer home address */ 1537 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1538 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1539 break; 1540 } 1541 #endif 1542 case IPV6_SADDR_RULE_OIF: 1543 /* Rule 5: Prefer outgoing interface */ 1544 ret = (!dst->ifindex || 1545 dst->ifindex == score->ifa->idev->dev->ifindex); 1546 break; 1547 case IPV6_SADDR_RULE_LABEL: 1548 /* Rule 6: Prefer matching label */ 1549 ret = ipv6_addr_label(net, 1550 &score->ifa->addr, score->addr_type, 1551 score->ifa->idev->dev->ifindex) == dst->label; 1552 break; 1553 case IPV6_SADDR_RULE_PRIVACY: 1554 { 1555 /* Rule 7: Prefer public address 1556 * Note: prefer temporary address if use_tempaddr >= 2 1557 */ 1558 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1559 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1560 score->ifa->idev->cnf.use_tempaddr >= 2; 1561 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1562 break; 1563 } 1564 case IPV6_SADDR_RULE_ORCHID: 1565 /* Rule 8-: Prefer ORCHID vs ORCHID or 1566 * non-ORCHID vs non-ORCHID 1567 */ 1568 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1569 ipv6_addr_orchid(dst->addr)); 1570 break; 1571 case IPV6_SADDR_RULE_PREFIX: 1572 /* Rule 8: Use longest matching prefix */ 1573 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1574 if (ret > score->ifa->prefix_len) 1575 ret = score->ifa->prefix_len; 1576 score->matchlen = ret; 1577 break; 1578 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1579 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1580 /* Optimistic addresses still have lower precedence than other 1581 * preferred addresses. 1582 */ 1583 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1584 break; 1585 #endif 1586 default: 1587 ret = 0; 1588 } 1589 1590 if (ret) 1591 __set_bit(i, score->scorebits); 1592 score->rule = i; 1593 out: 1594 return ret; 1595 } 1596 1597 static int __ipv6_dev_get_saddr(struct net *net, 1598 struct ipv6_saddr_dst *dst, 1599 struct inet6_dev *idev, 1600 struct ipv6_saddr_score *scores, 1601 int hiscore_idx) 1602 { 1603 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1604 1605 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1606 int i; 1607 1608 /* 1609 * - Tentative Address (RFC2462 section 5.4) 1610 * - A tentative address is not considered 1611 * "assigned to an interface" in the traditional 1612 * sense, unless it is also flagged as optimistic. 1613 * - Candidate Source Address (section 4) 1614 * - In any case, anycast addresses, multicast 1615 * addresses, and the unspecified address MUST 1616 * NOT be included in a candidate set. 1617 */ 1618 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1619 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1620 continue; 1621 1622 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1623 1624 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1625 score->addr_type & IPV6_ADDR_MULTICAST)) { 1626 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1627 idev->dev->name); 1628 continue; 1629 } 1630 1631 score->rule = -1; 1632 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1633 1634 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1635 int minihiscore, miniscore; 1636 1637 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1638 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1639 1640 if (minihiscore > miniscore) { 1641 if (i == IPV6_SADDR_RULE_SCOPE && 1642 score->scopedist > 0) { 1643 /* 1644 * special case: 1645 * each remaining entry 1646 * has too small (not enough) 1647 * scope, because ifa entries 1648 * are sorted by their scope 1649 * values. 1650 */ 1651 goto out; 1652 } 1653 break; 1654 } else if (minihiscore < miniscore) { 1655 swap(hiscore, score); 1656 hiscore_idx = 1 - hiscore_idx; 1657 1658 /* restore our iterator */ 1659 score->ifa = hiscore->ifa; 1660 1661 break; 1662 } 1663 } 1664 } 1665 out: 1666 return hiscore_idx; 1667 } 1668 1669 static int ipv6_get_saddr_master(struct net *net, 1670 const struct net_device *dst_dev, 1671 const struct net_device *master, 1672 struct ipv6_saddr_dst *dst, 1673 struct ipv6_saddr_score *scores, 1674 int hiscore_idx) 1675 { 1676 struct inet6_dev *idev; 1677 1678 idev = __in6_dev_get(dst_dev); 1679 if (idev) 1680 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1681 scores, hiscore_idx); 1682 1683 idev = __in6_dev_get(master); 1684 if (idev) 1685 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1686 scores, hiscore_idx); 1687 1688 return hiscore_idx; 1689 } 1690 1691 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1692 const struct in6_addr *daddr, unsigned int prefs, 1693 struct in6_addr *saddr) 1694 { 1695 struct ipv6_saddr_score scores[2], *hiscore; 1696 struct ipv6_saddr_dst dst; 1697 struct inet6_dev *idev; 1698 struct net_device *dev; 1699 int dst_type; 1700 bool use_oif_addr = false; 1701 int hiscore_idx = 0; 1702 int ret = 0; 1703 1704 dst_type = __ipv6_addr_type(daddr); 1705 dst.addr = daddr; 1706 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1707 dst.scope = __ipv6_addr_src_scope(dst_type); 1708 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1709 dst.prefs = prefs; 1710 1711 scores[hiscore_idx].rule = -1; 1712 scores[hiscore_idx].ifa = NULL; 1713 1714 rcu_read_lock(); 1715 1716 /* Candidate Source Address (section 4) 1717 * - multicast and link-local destination address, 1718 * the set of candidate source address MUST only 1719 * include addresses assigned to interfaces 1720 * belonging to the same link as the outgoing 1721 * interface. 1722 * (- For site-local destination addresses, the 1723 * set of candidate source addresses MUST only 1724 * include addresses assigned to interfaces 1725 * belonging to the same site as the outgoing 1726 * interface.) 1727 * - "It is RECOMMENDED that the candidate source addresses 1728 * be the set of unicast addresses assigned to the 1729 * interface that will be used to send to the destination 1730 * (the 'outgoing' interface)." (RFC 6724) 1731 */ 1732 if (dst_dev) { 1733 idev = __in6_dev_get(dst_dev); 1734 if ((dst_type & IPV6_ADDR_MULTICAST) || 1735 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1736 (idev && idev->cnf.use_oif_addrs_only)) { 1737 use_oif_addr = true; 1738 } 1739 } 1740 1741 if (use_oif_addr) { 1742 if (idev) 1743 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1744 } else { 1745 const struct net_device *master; 1746 int master_idx = 0; 1747 1748 /* if dst_dev exists and is enslaved to an L3 device, then 1749 * prefer addresses from dst_dev and then the master over 1750 * any other enslaved devices in the L3 domain. 1751 */ 1752 master = l3mdev_master_dev_rcu(dst_dev); 1753 if (master) { 1754 master_idx = master->ifindex; 1755 1756 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1757 master, &dst, 1758 scores, hiscore_idx); 1759 1760 if (scores[hiscore_idx].ifa) 1761 goto out; 1762 } 1763 1764 for_each_netdev_rcu(net, dev) { 1765 /* only consider addresses on devices in the 1766 * same L3 domain 1767 */ 1768 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1769 continue; 1770 idev = __in6_dev_get(dev); 1771 if (!idev) 1772 continue; 1773 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1774 } 1775 } 1776 1777 out: 1778 hiscore = &scores[hiscore_idx]; 1779 if (!hiscore->ifa) 1780 ret = -EADDRNOTAVAIL; 1781 else 1782 *saddr = hiscore->ifa->addr; 1783 1784 rcu_read_unlock(); 1785 return ret; 1786 } 1787 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1788 1789 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1790 u32 banned_flags) 1791 { 1792 struct inet6_ifaddr *ifp; 1793 int err = -EADDRNOTAVAIL; 1794 1795 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1796 if (ifp->scope > IFA_LINK) 1797 break; 1798 if (ifp->scope == IFA_LINK && 1799 !(ifp->flags & banned_flags)) { 1800 *addr = ifp->addr; 1801 err = 0; 1802 break; 1803 } 1804 } 1805 return err; 1806 } 1807 1808 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1809 u32 banned_flags) 1810 { 1811 struct inet6_dev *idev; 1812 int err = -EADDRNOTAVAIL; 1813 1814 rcu_read_lock(); 1815 idev = __in6_dev_get(dev); 1816 if (idev) { 1817 read_lock_bh(&idev->lock); 1818 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1819 read_unlock_bh(&idev->lock); 1820 } 1821 rcu_read_unlock(); 1822 return err; 1823 } 1824 1825 static int ipv6_count_addresses(const struct inet6_dev *idev) 1826 { 1827 const struct inet6_ifaddr *ifp; 1828 int cnt = 0; 1829 1830 rcu_read_lock(); 1831 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1832 cnt++; 1833 rcu_read_unlock(); 1834 return cnt; 1835 } 1836 1837 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1838 const struct net_device *dev, int strict) 1839 { 1840 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1841 strict, IFA_F_TENTATIVE); 1842 } 1843 EXPORT_SYMBOL(ipv6_chk_addr); 1844 1845 /* device argument is used to find the L3 domain of interest. If 1846 * skip_dev_check is set, then the ifp device is not checked against 1847 * the passed in dev argument. So the 2 cases for addresses checks are: 1848 * 1. does the address exist in the L3 domain that dev is part of 1849 * (skip_dev_check = true), or 1850 * 1851 * 2. does the address exist on the specific device 1852 * (skip_dev_check = false) 1853 */ 1854 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1855 const struct net_device *dev, bool skip_dev_check, 1856 int strict, u32 banned_flags) 1857 { 1858 unsigned int hash = inet6_addr_hash(net, addr); 1859 const struct net_device *l3mdev; 1860 struct inet6_ifaddr *ifp; 1861 u32 ifp_flags; 1862 1863 rcu_read_lock(); 1864 1865 l3mdev = l3mdev_master_dev_rcu(dev); 1866 if (skip_dev_check) 1867 dev = NULL; 1868 1869 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1870 if (!net_eq(dev_net(ifp->idev->dev), net)) 1871 continue; 1872 1873 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1874 continue; 1875 1876 /* Decouple optimistic from tentative for evaluation here. 1877 * Ban optimistic addresses explicitly, when required. 1878 */ 1879 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1880 ? (ifp->flags&~IFA_F_TENTATIVE) 1881 : ifp->flags; 1882 if (ipv6_addr_equal(&ifp->addr, addr) && 1883 !(ifp_flags&banned_flags) && 1884 (!dev || ifp->idev->dev == dev || 1885 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1886 rcu_read_unlock(); 1887 return 1; 1888 } 1889 } 1890 1891 rcu_read_unlock(); 1892 return 0; 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1895 1896 1897 /* Compares an address/prefix_len with addresses on device @dev. 1898 * If one is found it returns true. 1899 */ 1900 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1901 const unsigned int prefix_len, struct net_device *dev) 1902 { 1903 const struct inet6_ifaddr *ifa; 1904 const struct inet6_dev *idev; 1905 bool ret = false; 1906 1907 rcu_read_lock(); 1908 idev = __in6_dev_get(dev); 1909 if (idev) { 1910 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1911 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1912 if (ret) 1913 break; 1914 } 1915 } 1916 rcu_read_unlock(); 1917 1918 return ret; 1919 } 1920 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1921 1922 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1923 { 1924 const struct inet6_ifaddr *ifa; 1925 const struct inet6_dev *idev; 1926 int onlink; 1927 1928 onlink = 0; 1929 rcu_read_lock(); 1930 idev = __in6_dev_get(dev); 1931 if (idev) { 1932 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1933 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1934 ifa->prefix_len); 1935 if (onlink) 1936 break; 1937 } 1938 } 1939 rcu_read_unlock(); 1940 return onlink; 1941 } 1942 EXPORT_SYMBOL(ipv6_chk_prefix); 1943 1944 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1945 struct net_device *dev, int strict) 1946 { 1947 unsigned int hash = inet6_addr_hash(net, addr); 1948 struct inet6_ifaddr *ifp, *result = NULL; 1949 1950 rcu_read_lock(); 1951 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1952 if (!net_eq(dev_net(ifp->idev->dev), net)) 1953 continue; 1954 if (ipv6_addr_equal(&ifp->addr, addr)) { 1955 if (!dev || ifp->idev->dev == dev || 1956 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1957 result = ifp; 1958 in6_ifa_hold(ifp); 1959 break; 1960 } 1961 } 1962 } 1963 rcu_read_unlock(); 1964 1965 return result; 1966 } 1967 1968 /* Gets referenced address, destroys ifaddr */ 1969 1970 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1971 { 1972 if (dad_failed) 1973 ifp->flags |= IFA_F_DADFAILED; 1974 1975 if (ifp->flags&IFA_F_TEMPORARY) { 1976 struct inet6_ifaddr *ifpub; 1977 spin_lock_bh(&ifp->lock); 1978 ifpub = ifp->ifpub; 1979 if (ifpub) { 1980 in6_ifa_hold(ifpub); 1981 spin_unlock_bh(&ifp->lock); 1982 ipv6_create_tempaddr(ifpub, ifp, true); 1983 in6_ifa_put(ifpub); 1984 } else { 1985 spin_unlock_bh(&ifp->lock); 1986 } 1987 ipv6_del_addr(ifp); 1988 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1989 spin_lock_bh(&ifp->lock); 1990 addrconf_del_dad_work(ifp); 1991 ifp->flags |= IFA_F_TENTATIVE; 1992 if (dad_failed) 1993 ifp->flags &= ~IFA_F_OPTIMISTIC; 1994 spin_unlock_bh(&ifp->lock); 1995 if (dad_failed) 1996 ipv6_ifa_notify(0, ifp); 1997 in6_ifa_put(ifp); 1998 } else { 1999 ipv6_del_addr(ifp); 2000 } 2001 } 2002 2003 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2004 { 2005 int err = -ENOENT; 2006 2007 spin_lock_bh(&ifp->lock); 2008 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2009 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2010 err = 0; 2011 } 2012 spin_unlock_bh(&ifp->lock); 2013 2014 return err; 2015 } 2016 2017 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2018 { 2019 struct inet6_dev *idev = ifp->idev; 2020 struct net *net = dev_net(ifp->idev->dev); 2021 2022 if (addrconf_dad_end(ifp)) { 2023 in6_ifa_put(ifp); 2024 return; 2025 } 2026 2027 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2028 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2029 2030 spin_lock_bh(&ifp->lock); 2031 2032 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2033 struct in6_addr new_addr; 2034 struct inet6_ifaddr *ifp2; 2035 int retries = ifp->stable_privacy_retry + 1; 2036 struct ifa6_config cfg = { 2037 .pfx = &new_addr, 2038 .plen = ifp->prefix_len, 2039 .ifa_flags = ifp->flags, 2040 .valid_lft = ifp->valid_lft, 2041 .preferred_lft = ifp->prefered_lft, 2042 .scope = ifp->scope, 2043 }; 2044 2045 if (retries > net->ipv6.sysctl.idgen_retries) { 2046 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2047 ifp->idev->dev->name); 2048 goto errdad; 2049 } 2050 2051 new_addr = ifp->addr; 2052 if (ipv6_generate_stable_address(&new_addr, retries, 2053 idev)) 2054 goto errdad; 2055 2056 spin_unlock_bh(&ifp->lock); 2057 2058 if (idev->cnf.max_addresses && 2059 ipv6_count_addresses(idev) >= 2060 idev->cnf.max_addresses) 2061 goto lock_errdad; 2062 2063 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2064 ifp->idev->dev->name); 2065 2066 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2067 if (IS_ERR(ifp2)) 2068 goto lock_errdad; 2069 2070 spin_lock_bh(&ifp2->lock); 2071 ifp2->stable_privacy_retry = retries; 2072 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2073 spin_unlock_bh(&ifp2->lock); 2074 2075 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2076 in6_ifa_put(ifp2); 2077 lock_errdad: 2078 spin_lock_bh(&ifp->lock); 2079 } 2080 2081 errdad: 2082 /* transition from _POSTDAD to _ERRDAD */ 2083 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2084 spin_unlock_bh(&ifp->lock); 2085 2086 addrconf_mod_dad_work(ifp, 0); 2087 in6_ifa_put(ifp); 2088 } 2089 2090 /* Join to solicited addr multicast group. 2091 * caller must hold RTNL */ 2092 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2093 { 2094 struct in6_addr maddr; 2095 2096 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2097 return; 2098 2099 addrconf_addr_solict_mult(addr, &maddr); 2100 ipv6_dev_mc_inc(dev, &maddr); 2101 } 2102 2103 /* caller must hold RTNL */ 2104 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2105 { 2106 struct in6_addr maddr; 2107 2108 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2109 return; 2110 2111 addrconf_addr_solict_mult(addr, &maddr); 2112 __ipv6_dev_mc_dec(idev, &maddr); 2113 } 2114 2115 /* caller must hold RTNL */ 2116 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2117 { 2118 struct in6_addr addr; 2119 2120 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2121 return; 2122 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2123 if (ipv6_addr_any(&addr)) 2124 return; 2125 __ipv6_dev_ac_inc(ifp->idev, &addr); 2126 } 2127 2128 /* caller must hold RTNL */ 2129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2130 { 2131 struct in6_addr addr; 2132 2133 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2134 return; 2135 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2136 if (ipv6_addr_any(&addr)) 2137 return; 2138 __ipv6_dev_ac_dec(ifp->idev, &addr); 2139 } 2140 2141 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2142 { 2143 switch (dev->addr_len) { 2144 case ETH_ALEN: 2145 memcpy(eui, dev->dev_addr, 3); 2146 eui[3] = 0xFF; 2147 eui[4] = 0xFE; 2148 memcpy(eui + 5, dev->dev_addr + 3, 3); 2149 break; 2150 case EUI64_ADDR_LEN: 2151 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2152 eui[0] ^= 2; 2153 break; 2154 default: 2155 return -1; 2156 } 2157 2158 return 0; 2159 } 2160 2161 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2162 { 2163 union fwnet_hwaddr *ha; 2164 2165 if (dev->addr_len != FWNET_ALEN) 2166 return -1; 2167 2168 ha = (union fwnet_hwaddr *)dev->dev_addr; 2169 2170 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2171 eui[0] ^= 2; 2172 return 0; 2173 } 2174 2175 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2176 { 2177 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2178 if (dev->addr_len != ARCNET_ALEN) 2179 return -1; 2180 memset(eui, 0, 7); 2181 eui[7] = *(u8 *)dev->dev_addr; 2182 return 0; 2183 } 2184 2185 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2186 { 2187 if (dev->addr_len != INFINIBAND_ALEN) 2188 return -1; 2189 memcpy(eui, dev->dev_addr + 12, 8); 2190 eui[0] |= 2; 2191 return 0; 2192 } 2193 2194 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2195 { 2196 if (addr == 0) 2197 return -1; 2198 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2199 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2200 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2201 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2202 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2203 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2204 eui[1] = 0; 2205 eui[2] = 0x5E; 2206 eui[3] = 0xFE; 2207 memcpy(eui + 4, &addr, 4); 2208 return 0; 2209 } 2210 2211 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2212 { 2213 if (dev->priv_flags & IFF_ISATAP) 2214 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2215 return -1; 2216 } 2217 2218 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2219 { 2220 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2221 } 2222 2223 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2224 { 2225 memcpy(eui, dev->perm_addr, 3); 2226 memcpy(eui + 5, dev->perm_addr + 3, 3); 2227 eui[3] = 0xFF; 2228 eui[4] = 0xFE; 2229 eui[0] ^= 2; 2230 return 0; 2231 } 2232 2233 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2234 { 2235 switch (dev->type) { 2236 case ARPHRD_ETHER: 2237 case ARPHRD_FDDI: 2238 return addrconf_ifid_eui48(eui, dev); 2239 case ARPHRD_ARCNET: 2240 return addrconf_ifid_arcnet(eui, dev); 2241 case ARPHRD_INFINIBAND: 2242 return addrconf_ifid_infiniband(eui, dev); 2243 case ARPHRD_SIT: 2244 return addrconf_ifid_sit(eui, dev); 2245 case ARPHRD_IPGRE: 2246 case ARPHRD_TUNNEL: 2247 return addrconf_ifid_gre(eui, dev); 2248 case ARPHRD_6LOWPAN: 2249 return addrconf_ifid_6lowpan(eui, dev); 2250 case ARPHRD_IEEE1394: 2251 return addrconf_ifid_ieee1394(eui, dev); 2252 case ARPHRD_TUNNEL6: 2253 case ARPHRD_IP6GRE: 2254 case ARPHRD_RAWIP: 2255 return addrconf_ifid_ip6tnl(eui, dev); 2256 } 2257 return -1; 2258 } 2259 2260 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2261 { 2262 int err = -1; 2263 struct inet6_ifaddr *ifp; 2264 2265 read_lock_bh(&idev->lock); 2266 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2267 if (ifp->scope > IFA_LINK) 2268 break; 2269 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2270 memcpy(eui, ifp->addr.s6_addr+8, 8); 2271 err = 0; 2272 break; 2273 } 2274 } 2275 read_unlock_bh(&idev->lock); 2276 return err; 2277 } 2278 2279 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2280 static void ipv6_regen_rndid(struct inet6_dev *idev) 2281 { 2282 regen: 2283 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2284 idev->rndid[0] &= ~0x02; 2285 2286 /* 2287 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2288 * check if generated address is not inappropriate 2289 * 2290 * - Reserved subnet anycast (RFC 2526) 2291 * 11111101 11....11 1xxxxxxx 2292 * - ISATAP (RFC4214) 6.1 2293 * 00-00-5E-FE-xx-xx-xx-xx 2294 * - value 0 2295 * - XXX: already assigned to an address on the device 2296 */ 2297 if (idev->rndid[0] == 0xfd && 2298 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2299 (idev->rndid[7]&0x80)) 2300 goto regen; 2301 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2302 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2303 goto regen; 2304 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2305 goto regen; 2306 } 2307 } 2308 2309 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2310 { 2311 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2312 ipv6_regen_rndid(idev); 2313 } 2314 2315 /* 2316 * Add prefix route. 2317 */ 2318 2319 static void 2320 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2321 struct net_device *dev, unsigned long expires, 2322 u32 flags, gfp_t gfp_flags) 2323 { 2324 struct fib6_config cfg = { 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2326 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2327 .fc_ifindex = dev->ifindex, 2328 .fc_expires = expires, 2329 .fc_dst_len = plen, 2330 .fc_flags = RTF_UP | flags, 2331 .fc_nlinfo.nl_net = dev_net(dev), 2332 .fc_protocol = RTPROT_KERNEL, 2333 .fc_type = RTN_UNICAST, 2334 }; 2335 2336 cfg.fc_dst = *pfx; 2337 2338 /* Prevent useless cloning on PtP SIT. 2339 This thing is done here expecting that the whole 2340 class of non-broadcast devices need not cloning. 2341 */ 2342 #if IS_ENABLED(CONFIG_IPV6_SIT) 2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2344 cfg.fc_flags |= RTF_NONEXTHOP; 2345 #endif 2346 2347 ip6_route_add(&cfg, gfp_flags, NULL); 2348 } 2349 2350 2351 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2352 int plen, 2353 const struct net_device *dev, 2354 u32 flags, u32 noflags) 2355 { 2356 struct fib6_node *fn; 2357 struct fib6_info *rt = NULL; 2358 struct fib6_table *table; 2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2360 2361 table = fib6_get_table(dev_net(dev), tb_id); 2362 if (!table) 2363 return NULL; 2364 2365 rcu_read_lock(); 2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2367 if (!fn) 2368 goto out; 2369 2370 for_each_fib6_node_rt_rcu(fn) { 2371 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2372 continue; 2373 if ((rt->fib6_flags & flags) != flags) 2374 continue; 2375 if ((rt->fib6_flags & noflags) != 0) 2376 continue; 2377 fib6_info_hold(rt); 2378 break; 2379 } 2380 out: 2381 rcu_read_unlock(); 2382 return rt; 2383 } 2384 2385 2386 /* Create "default" multicast route to the interface */ 2387 2388 static void addrconf_add_mroute(struct net_device *dev) 2389 { 2390 struct fib6_config cfg = { 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2392 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2393 .fc_ifindex = dev->ifindex, 2394 .fc_dst_len = 8, 2395 .fc_flags = RTF_UP, 2396 .fc_type = RTN_UNICAST, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, GFP_ATOMIC, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 struct ifa6_config cfg = { 2511 .pfx = addr, 2512 .plen = pinfo->prefix_len, 2513 .ifa_flags = addr_flags, 2514 .valid_lft = valid_lft, 2515 .preferred_lft = prefered_lft, 2516 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2517 }; 2518 2519 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2520 if ((net->ipv6.devconf_all->optimistic_dad || 2521 in6_dev->cnf.optimistic_dad) && 2522 !net->ipv6.devconf_all->forwarding && sllao) 2523 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2524 #endif 2525 2526 /* Do not allow to create too much of autoconfigured 2527 * addresses; this would be too easy way to crash kernel. 2528 */ 2529 if (!max_addresses || 2530 ipv6_count_addresses(in6_dev) < max_addresses) 2531 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2532 2533 if (IS_ERR_OR_NULL(ifp)) 2534 return -1; 2535 2536 create = 1; 2537 spin_lock_bh(&ifp->lock); 2538 ifp->flags |= IFA_F_MANAGETEMPADDR; 2539 ifp->cstamp = jiffies; 2540 ifp->tokenized = tokenized; 2541 spin_unlock_bh(&ifp->lock); 2542 addrconf_dad_start(ifp); 2543 } 2544 2545 if (ifp) { 2546 u32 flags; 2547 unsigned long now; 2548 u32 stored_lft; 2549 2550 /* update lifetime (RFC2462 5.5.3 e) */ 2551 spin_lock_bh(&ifp->lock); 2552 now = jiffies; 2553 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2554 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2555 else 2556 stored_lft = 0; 2557 if (!create && stored_lft) { 2558 const u32 minimum_lft = min_t(u32, 2559 stored_lft, MIN_VALID_LIFETIME); 2560 valid_lft = max(valid_lft, minimum_lft); 2561 2562 /* RFC4862 Section 5.5.3e: 2563 * "Note that the preferred lifetime of the 2564 * corresponding address is always reset to 2565 * the Preferred Lifetime in the received 2566 * Prefix Information option, regardless of 2567 * whether the valid lifetime is also reset or 2568 * ignored." 2569 * 2570 * So we should always update prefered_lft here. 2571 */ 2572 update_lft = 1; 2573 } 2574 2575 if (update_lft) { 2576 ifp->valid_lft = valid_lft; 2577 ifp->prefered_lft = prefered_lft; 2578 ifp->tstamp = now; 2579 flags = ifp->flags; 2580 ifp->flags &= ~IFA_F_DEPRECATED; 2581 spin_unlock_bh(&ifp->lock); 2582 2583 if (!(flags&IFA_F_TENTATIVE)) 2584 ipv6_ifa_notify(0, ifp); 2585 } else 2586 spin_unlock_bh(&ifp->lock); 2587 2588 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2589 create, now); 2590 2591 in6_ifa_put(ifp); 2592 addrconf_verify(); 2593 } 2594 2595 return 0; 2596 } 2597 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2598 2599 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2600 { 2601 struct prefix_info *pinfo; 2602 __u32 valid_lft; 2603 __u32 prefered_lft; 2604 int addr_type, err; 2605 u32 addr_flags = 0; 2606 struct inet6_dev *in6_dev; 2607 struct net *net = dev_net(dev); 2608 2609 pinfo = (struct prefix_info *) opt; 2610 2611 if (len < sizeof(struct prefix_info)) { 2612 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2613 return; 2614 } 2615 2616 /* 2617 * Validation checks ([ADDRCONF], page 19) 2618 */ 2619 2620 addr_type = ipv6_addr_type(&pinfo->prefix); 2621 2622 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2623 return; 2624 2625 valid_lft = ntohl(pinfo->valid); 2626 prefered_lft = ntohl(pinfo->prefered); 2627 2628 if (prefered_lft > valid_lft) { 2629 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2630 return; 2631 } 2632 2633 in6_dev = in6_dev_get(dev); 2634 2635 if (!in6_dev) { 2636 net_dbg_ratelimited("addrconf: device %s not configured\n", 2637 dev->name); 2638 return; 2639 } 2640 2641 /* 2642 * Two things going on here: 2643 * 1) Add routes for on-link prefixes 2644 * 2) Configure prefixes with the auto flag set 2645 */ 2646 2647 if (pinfo->onlink) { 2648 struct fib6_info *rt; 2649 unsigned long rt_expires; 2650 2651 /* Avoid arithmetic overflow. Really, we could 2652 * save rt_expires in seconds, likely valid_lft, 2653 * but it would require division in fib gc, that it 2654 * not good. 2655 */ 2656 if (HZ > USER_HZ) 2657 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2658 else 2659 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2660 2661 if (addrconf_finite_timeout(rt_expires)) 2662 rt_expires *= HZ; 2663 2664 rt = addrconf_get_prefix_route(&pinfo->prefix, 2665 pinfo->prefix_len, 2666 dev, 2667 RTF_ADDRCONF | RTF_PREFIX_RT, 2668 RTF_GATEWAY | RTF_DEFAULT); 2669 2670 if (rt) { 2671 /* Autoconf prefix route */ 2672 if (valid_lft == 0) { 2673 ip6_del_rt(net, rt); 2674 rt = NULL; 2675 } else if (addrconf_finite_timeout(rt_expires)) { 2676 /* not infinity */ 2677 fib6_set_expires(rt, jiffies + rt_expires); 2678 } else { 2679 fib6_clean_expires(rt); 2680 } 2681 } else if (valid_lft) { 2682 clock_t expires = 0; 2683 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2684 if (addrconf_finite_timeout(rt_expires)) { 2685 /* not infinity */ 2686 flags |= RTF_EXPIRES; 2687 expires = jiffies_to_clock_t(rt_expires); 2688 } 2689 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2690 0, dev, expires, flags, 2691 GFP_ATOMIC); 2692 } 2693 fib6_info_release(rt); 2694 } 2695 2696 /* Try to figure out our local address for this prefix */ 2697 2698 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2699 struct in6_addr addr; 2700 bool tokenized = false, dev_addr_generated = false; 2701 2702 if (pinfo->prefix_len == 64) { 2703 memcpy(&addr, &pinfo->prefix, 8); 2704 2705 if (!ipv6_addr_any(&in6_dev->token)) { 2706 read_lock_bh(&in6_dev->lock); 2707 memcpy(addr.s6_addr + 8, 2708 in6_dev->token.s6_addr + 8, 8); 2709 read_unlock_bh(&in6_dev->lock); 2710 tokenized = true; 2711 } else if (is_addr_mode_generate_stable(in6_dev) && 2712 !ipv6_generate_stable_address(&addr, 0, 2713 in6_dev)) { 2714 addr_flags |= IFA_F_STABLE_PRIVACY; 2715 goto ok; 2716 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2717 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2718 goto put; 2719 } else { 2720 dev_addr_generated = true; 2721 } 2722 goto ok; 2723 } 2724 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2725 pinfo->prefix_len); 2726 goto put; 2727 2728 ok: 2729 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2730 &addr, addr_type, 2731 addr_flags, sllao, 2732 tokenized, valid_lft, 2733 prefered_lft); 2734 if (err) 2735 goto put; 2736 2737 /* Ignore error case here because previous prefix add addr was 2738 * successful which will be notified. 2739 */ 2740 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2741 addr_type, addr_flags, sllao, 2742 tokenized, valid_lft, 2743 prefered_lft, 2744 dev_addr_generated); 2745 } 2746 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2747 put: 2748 in6_dev_put(in6_dev); 2749 } 2750 2751 /* 2752 * Set destination address. 2753 * Special case for SIT interfaces where we create a new "virtual" 2754 * device. 2755 */ 2756 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2757 { 2758 struct in6_ifreq ireq; 2759 struct net_device *dev; 2760 int err = -EINVAL; 2761 2762 rtnl_lock(); 2763 2764 err = -EFAULT; 2765 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2766 goto err_exit; 2767 2768 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2769 2770 err = -ENODEV; 2771 if (!dev) 2772 goto err_exit; 2773 2774 #if IS_ENABLED(CONFIG_IPV6_SIT) 2775 if (dev->type == ARPHRD_SIT) { 2776 const struct net_device_ops *ops = dev->netdev_ops; 2777 struct ifreq ifr; 2778 struct ip_tunnel_parm p; 2779 2780 err = -EADDRNOTAVAIL; 2781 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2782 goto err_exit; 2783 2784 memset(&p, 0, sizeof(p)); 2785 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2786 p.iph.saddr = 0; 2787 p.iph.version = 4; 2788 p.iph.ihl = 5; 2789 p.iph.protocol = IPPROTO_IPV6; 2790 p.iph.ttl = 64; 2791 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2792 2793 if (ops->ndo_do_ioctl) { 2794 mm_segment_t oldfs = get_fs(); 2795 2796 set_fs(KERNEL_DS); 2797 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2798 set_fs(oldfs); 2799 } else 2800 err = -EOPNOTSUPP; 2801 2802 if (err == 0) { 2803 err = -ENOBUFS; 2804 dev = __dev_get_by_name(net, p.name); 2805 if (!dev) 2806 goto err_exit; 2807 err = dev_open(dev); 2808 } 2809 } 2810 #endif 2811 2812 err_exit: 2813 rtnl_unlock(); 2814 return err; 2815 } 2816 2817 static int ipv6_mc_config(struct sock *sk, bool join, 2818 const struct in6_addr *addr, int ifindex) 2819 { 2820 int ret; 2821 2822 ASSERT_RTNL(); 2823 2824 lock_sock(sk); 2825 if (join) 2826 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2827 else 2828 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2829 release_sock(sk); 2830 2831 return ret; 2832 } 2833 2834 /* 2835 * Manual configuration of address on an interface 2836 */ 2837 static int inet6_addr_add(struct net *net, int ifindex, 2838 struct ifa6_config *cfg, 2839 struct netlink_ext_ack *extack) 2840 { 2841 struct inet6_ifaddr *ifp; 2842 struct inet6_dev *idev; 2843 struct net_device *dev; 2844 unsigned long timeout; 2845 clock_t expires; 2846 u32 flags; 2847 2848 ASSERT_RTNL(); 2849 2850 if (cfg->plen > 128) 2851 return -EINVAL; 2852 2853 /* check the lifetime */ 2854 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2855 return -EINVAL; 2856 2857 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2858 return -EINVAL; 2859 2860 dev = __dev_get_by_index(net, ifindex); 2861 if (!dev) 2862 return -ENODEV; 2863 2864 idev = addrconf_add_dev(dev); 2865 if (IS_ERR(idev)) 2866 return PTR_ERR(idev); 2867 2868 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2870 true, cfg->pfx, ifindex); 2871 2872 if (ret < 0) 2873 return ret; 2874 } 2875 2876 cfg->scope = ipv6_addr_scope(cfg->pfx); 2877 2878 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2879 if (addrconf_finite_timeout(timeout)) { 2880 expires = jiffies_to_clock_t(timeout * HZ); 2881 cfg->valid_lft = timeout; 2882 flags = RTF_EXPIRES; 2883 } else { 2884 expires = 0; 2885 flags = 0; 2886 cfg->ifa_flags |= IFA_F_PERMANENT; 2887 } 2888 2889 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2890 if (addrconf_finite_timeout(timeout)) { 2891 if (timeout == 0) 2892 cfg->ifa_flags |= IFA_F_DEPRECATED; 2893 cfg->preferred_lft = timeout; 2894 } 2895 2896 ifp = ipv6_add_addr(idev, cfg, true, extack); 2897 if (!IS_ERR(ifp)) { 2898 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2899 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2900 ifp->rt_priority, dev, expires, 2901 flags, GFP_KERNEL); 2902 } 2903 2904 /* Send a netlink notification if DAD is enabled and 2905 * optimistic flag is not set 2906 */ 2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2908 ipv6_ifa_notify(0, ifp); 2909 /* 2910 * Note that section 3.1 of RFC 4429 indicates 2911 * that the Optimistic flag should not be set for 2912 * manually configured addresses 2913 */ 2914 addrconf_dad_start(ifp); 2915 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2916 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2917 cfg->preferred_lft, true, jiffies); 2918 in6_ifa_put(ifp); 2919 addrconf_verify_rtnl(); 2920 return 0; 2921 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2923 cfg->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 ifa6_config cfg = { 2975 .ifa_flags = IFA_F_PERMANENT, 2976 .preferred_lft = INFINITY_LIFE_TIME, 2977 .valid_lft = INFINITY_LIFE_TIME, 2978 }; 2979 struct in6_ifreq ireq; 2980 int err; 2981 2982 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2983 return -EPERM; 2984 2985 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2986 return -EFAULT; 2987 2988 cfg.pfx = &ireq.ifr6_addr; 2989 cfg.plen = ireq.ifr6_prefixlen; 2990 2991 rtnl_lock(); 2992 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 2993 rtnl_unlock(); 2994 return err; 2995 } 2996 2997 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2998 { 2999 struct in6_ifreq ireq; 3000 int err; 3001 3002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3003 return -EPERM; 3004 3005 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3006 return -EFAULT; 3007 3008 rtnl_lock(); 3009 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3010 ireq.ifr6_prefixlen); 3011 rtnl_unlock(); 3012 return err; 3013 } 3014 3015 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3016 int plen, int scope) 3017 { 3018 struct inet6_ifaddr *ifp; 3019 struct ifa6_config cfg = { 3020 .pfx = addr, 3021 .plen = plen, 3022 .ifa_flags = IFA_F_PERMANENT, 3023 .valid_lft = INFINITY_LIFE_TIME, 3024 .preferred_lft = INFINITY_LIFE_TIME, 3025 .scope = scope 3026 }; 3027 3028 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3029 if (!IS_ERR(ifp)) { 3030 spin_lock_bh(&ifp->lock); 3031 ifp->flags &= ~IFA_F_TENTATIVE; 3032 spin_unlock_bh(&ifp->lock); 3033 rt_genid_bump_ipv6(dev_net(idev->dev)); 3034 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3035 in6_ifa_put(ifp); 3036 } 3037 } 3038 3039 #if IS_ENABLED(CONFIG_IPV6_SIT) 3040 static void sit_add_v4_addrs(struct inet6_dev *idev) 3041 { 3042 struct in6_addr addr; 3043 struct net_device *dev; 3044 struct net *net = dev_net(idev->dev); 3045 int scope, plen; 3046 u32 pflags = 0; 3047 3048 ASSERT_RTNL(); 3049 3050 memset(&addr, 0, sizeof(struct in6_addr)); 3051 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3052 3053 if (idev->dev->flags&IFF_POINTOPOINT) { 3054 addr.s6_addr32[0] = htonl(0xfe800000); 3055 scope = IFA_LINK; 3056 plen = 64; 3057 } else { 3058 scope = IPV6_ADDR_COMPATv4; 3059 plen = 96; 3060 pflags |= RTF_NONEXTHOP; 3061 } 3062 3063 if (addr.s6_addr32[3]) { 3064 add_addr(idev, &addr, plen, scope); 3065 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3066 GFP_ATOMIC); 3067 return; 3068 } 3069 3070 for_each_netdev(net, dev) { 3071 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3072 if (in_dev && (dev->flags & IFF_UP)) { 3073 struct in_ifaddr *ifa; 3074 3075 int flag = scope; 3076 3077 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3078 3079 addr.s6_addr32[3] = ifa->ifa_local; 3080 3081 if (ifa->ifa_scope == RT_SCOPE_LINK) 3082 continue; 3083 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3084 if (idev->dev->flags&IFF_POINTOPOINT) 3085 continue; 3086 flag |= IFA_HOST; 3087 } 3088 3089 add_addr(idev, &addr, plen, flag); 3090 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3091 0, pflags, GFP_ATOMIC); 3092 } 3093 } 3094 } 3095 } 3096 #endif 3097 3098 static void init_loopback(struct net_device *dev) 3099 { 3100 struct inet6_dev *idev; 3101 3102 /* ::1 */ 3103 3104 ASSERT_RTNL(); 3105 3106 idev = ipv6_find_idev(dev); 3107 if (!idev) { 3108 pr_debug("%s: add_dev failed\n", __func__); 3109 return; 3110 } 3111 3112 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3113 } 3114 3115 void addrconf_add_linklocal(struct inet6_dev *idev, 3116 const struct in6_addr *addr, u32 flags) 3117 { 3118 struct ifa6_config cfg = { 3119 .pfx = addr, 3120 .plen = 64, 3121 .ifa_flags = flags | IFA_F_PERMANENT, 3122 .valid_lft = INFINITY_LIFE_TIME, 3123 .preferred_lft = INFINITY_LIFE_TIME, 3124 .scope = IFA_LINK 3125 }; 3126 struct inet6_ifaddr *ifp; 3127 3128 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3129 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3130 idev->cnf.optimistic_dad) && 3131 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3132 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3133 #endif 3134 3135 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3136 if (!IS_ERR(ifp)) { 3137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3138 0, 0, GFP_ATOMIC); 3139 addrconf_dad_start(ifp); 3140 in6_ifa_put(ifp); 3141 } 3142 } 3143 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3144 3145 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3146 { 3147 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3148 return true; 3149 3150 if (address.s6_addr32[2] == htonl(0x02005eff) && 3151 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3152 return true; 3153 3154 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3155 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3156 return true; 3157 3158 return false; 3159 } 3160 3161 static int ipv6_generate_stable_address(struct in6_addr *address, 3162 u8 dad_count, 3163 const struct inet6_dev *idev) 3164 { 3165 static DEFINE_SPINLOCK(lock); 3166 static __u32 digest[SHA_DIGEST_WORDS]; 3167 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3168 3169 static union { 3170 char __data[SHA_MESSAGE_BYTES]; 3171 struct { 3172 struct in6_addr secret; 3173 __be32 prefix[2]; 3174 unsigned char hwaddr[MAX_ADDR_LEN]; 3175 u8 dad_count; 3176 } __packed; 3177 } data; 3178 3179 struct in6_addr secret; 3180 struct in6_addr temp; 3181 struct net *net = dev_net(idev->dev); 3182 3183 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3184 3185 if (idev->cnf.stable_secret.initialized) 3186 secret = idev->cnf.stable_secret.secret; 3187 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3188 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3189 else 3190 return -1; 3191 3192 retry: 3193 spin_lock_bh(&lock); 3194 3195 sha_init(digest); 3196 memset(&data, 0, sizeof(data)); 3197 memset(workspace, 0, sizeof(workspace)); 3198 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3199 data.prefix[0] = address->s6_addr32[0]; 3200 data.prefix[1] = address->s6_addr32[1]; 3201 data.secret = secret; 3202 data.dad_count = dad_count; 3203 3204 sha_transform(digest, data.__data, workspace); 3205 3206 temp = *address; 3207 temp.s6_addr32[2] = (__force __be32)digest[0]; 3208 temp.s6_addr32[3] = (__force __be32)digest[1]; 3209 3210 spin_unlock_bh(&lock); 3211 3212 if (ipv6_reserved_interfaceid(temp)) { 3213 dad_count++; 3214 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3215 return -1; 3216 goto retry; 3217 } 3218 3219 *address = temp; 3220 return 0; 3221 } 3222 3223 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3224 { 3225 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3226 3227 if (s->initialized) 3228 return; 3229 s = &idev->cnf.stable_secret; 3230 get_random_bytes(&s->secret, sizeof(s->secret)); 3231 s->initialized = true; 3232 } 3233 3234 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3235 { 3236 struct in6_addr addr; 3237 3238 /* no link local addresses on L3 master devices */ 3239 if (netif_is_l3_master(idev->dev)) 3240 return; 3241 3242 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3243 3244 switch (idev->cnf.addr_gen_mode) { 3245 case IN6_ADDR_GEN_MODE_RANDOM: 3246 ipv6_gen_mode_random_init(idev); 3247 /* fallthrough */ 3248 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3249 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3250 addrconf_add_linklocal(idev, &addr, 3251 IFA_F_STABLE_PRIVACY); 3252 else if (prefix_route) 3253 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3254 0, 0, GFP_KERNEL); 3255 break; 3256 case IN6_ADDR_GEN_MODE_EUI64: 3257 /* addrconf_add_linklocal also adds a prefix_route and we 3258 * only need to care about prefix routes if ipv6_generate_eui64 3259 * couldn't generate one. 3260 */ 3261 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3262 addrconf_add_linklocal(idev, &addr, 0); 3263 else if (prefix_route) 3264 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3265 0, 0, GFP_KERNEL); 3266 break; 3267 case IN6_ADDR_GEN_MODE_NONE: 3268 default: 3269 /* will not add any link local address */ 3270 break; 3271 } 3272 } 3273 3274 static void addrconf_dev_config(struct net_device *dev) 3275 { 3276 struct inet6_dev *idev; 3277 3278 ASSERT_RTNL(); 3279 3280 if ((dev->type != ARPHRD_ETHER) && 3281 (dev->type != ARPHRD_FDDI) && 3282 (dev->type != ARPHRD_ARCNET) && 3283 (dev->type != ARPHRD_INFINIBAND) && 3284 (dev->type != ARPHRD_IEEE1394) && 3285 (dev->type != ARPHRD_TUNNEL6) && 3286 (dev->type != ARPHRD_6LOWPAN) && 3287 (dev->type != ARPHRD_IP6GRE) && 3288 (dev->type != ARPHRD_IPGRE) && 3289 (dev->type != ARPHRD_TUNNEL) && 3290 (dev->type != ARPHRD_NONE) && 3291 (dev->type != ARPHRD_RAWIP)) { 3292 /* Alas, we support only Ethernet autoconfiguration. */ 3293 return; 3294 } 3295 3296 idev = addrconf_add_dev(dev); 3297 if (IS_ERR(idev)) 3298 return; 3299 3300 /* this device type has no EUI support */ 3301 if (dev->type == ARPHRD_NONE && 3302 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3303 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3304 3305 addrconf_addr_gen(idev, false); 3306 } 3307 3308 #if IS_ENABLED(CONFIG_IPV6_SIT) 3309 static void addrconf_sit_config(struct net_device *dev) 3310 { 3311 struct inet6_dev *idev; 3312 3313 ASSERT_RTNL(); 3314 3315 /* 3316 * Configure the tunnel with one of our IPv4 3317 * addresses... we should configure all of 3318 * our v4 addrs in the tunnel 3319 */ 3320 3321 idev = ipv6_find_idev(dev); 3322 if (!idev) { 3323 pr_debug("%s: add_dev failed\n", __func__); 3324 return; 3325 } 3326 3327 if (dev->priv_flags & IFF_ISATAP) { 3328 addrconf_addr_gen(idev, false); 3329 return; 3330 } 3331 3332 sit_add_v4_addrs(idev); 3333 3334 if (dev->flags&IFF_POINTOPOINT) 3335 addrconf_add_mroute(dev); 3336 } 3337 #endif 3338 3339 #if IS_ENABLED(CONFIG_NET_IPGRE) 3340 static void addrconf_gre_config(struct net_device *dev) 3341 { 3342 struct inet6_dev *idev; 3343 3344 ASSERT_RTNL(); 3345 3346 idev = ipv6_find_idev(dev); 3347 if (!idev) { 3348 pr_debug("%s: add_dev failed\n", __func__); 3349 return; 3350 } 3351 3352 addrconf_addr_gen(idev, true); 3353 if (dev->flags & IFF_POINTOPOINT) 3354 addrconf_add_mroute(dev); 3355 } 3356 #endif 3357 3358 static int fixup_permanent_addr(struct net *net, 3359 struct inet6_dev *idev, 3360 struct inet6_ifaddr *ifp) 3361 { 3362 /* !fib6_node means the host route was removed from the 3363 * FIB, for example, if 'lo' device is taken down. In that 3364 * case regenerate the host route. 3365 */ 3366 if (!ifp->rt || !ifp->rt->fib6_node) { 3367 struct fib6_info *f6i, *prev; 3368 3369 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3370 GFP_ATOMIC); 3371 if (IS_ERR(f6i)) 3372 return PTR_ERR(f6i); 3373 3374 /* ifp->rt can be accessed outside of rtnl */ 3375 spin_lock(&ifp->lock); 3376 prev = ifp->rt; 3377 ifp->rt = f6i; 3378 spin_unlock(&ifp->lock); 3379 3380 fib6_info_release(prev); 3381 } 3382 3383 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3384 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3385 ifp->rt_priority, idev->dev, 0, 0, 3386 GFP_ATOMIC); 3387 } 3388 3389 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3390 addrconf_dad_start(ifp); 3391 3392 return 0; 3393 } 3394 3395 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3396 { 3397 struct inet6_ifaddr *ifp, *tmp; 3398 struct inet6_dev *idev; 3399 3400 idev = __in6_dev_get(dev); 3401 if (!idev) 3402 return; 3403 3404 write_lock_bh(&idev->lock); 3405 3406 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3407 if ((ifp->flags & IFA_F_PERMANENT) && 3408 fixup_permanent_addr(net, idev, ifp) < 0) { 3409 write_unlock_bh(&idev->lock); 3410 in6_ifa_hold(ifp); 3411 ipv6_del_addr(ifp); 3412 write_lock_bh(&idev->lock); 3413 3414 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3415 idev->dev->name, &ifp->addr); 3416 } 3417 } 3418 3419 write_unlock_bh(&idev->lock); 3420 } 3421 3422 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3423 void *ptr) 3424 { 3425 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3426 struct netdev_notifier_changeupper_info *info; 3427 struct inet6_dev *idev = __in6_dev_get(dev); 3428 struct net *net = dev_net(dev); 3429 int run_pending = 0; 3430 int err; 3431 3432 switch (event) { 3433 case NETDEV_REGISTER: 3434 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3435 idev = ipv6_add_dev(dev); 3436 if (IS_ERR(idev)) 3437 return notifier_from_errno(PTR_ERR(idev)); 3438 } 3439 break; 3440 3441 case NETDEV_CHANGEMTU: 3442 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3443 if (dev->mtu < IPV6_MIN_MTU) { 3444 addrconf_ifdown(dev, dev != net->loopback_dev); 3445 break; 3446 } 3447 3448 if (idev) { 3449 rt6_mtu_change(dev, dev->mtu); 3450 idev->cnf.mtu6 = dev->mtu; 3451 break; 3452 } 3453 3454 /* allocate new idev */ 3455 idev = ipv6_add_dev(dev); 3456 if (IS_ERR(idev)) 3457 break; 3458 3459 /* device is still not ready */ 3460 if (!(idev->if_flags & IF_READY)) 3461 break; 3462 3463 run_pending = 1; 3464 3465 /* fall through */ 3466 3467 case NETDEV_UP: 3468 case NETDEV_CHANGE: 3469 if (dev->flags & IFF_SLAVE) 3470 break; 3471 3472 if (idev && idev->cnf.disable_ipv6) 3473 break; 3474 3475 if (event == NETDEV_UP) { 3476 /* restore routes for permanent addresses */ 3477 addrconf_permanent_addr(net, dev); 3478 3479 if (!addrconf_link_ready(dev)) { 3480 /* device is not ready yet. */ 3481 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3482 dev->name); 3483 break; 3484 } 3485 3486 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3487 idev = ipv6_add_dev(dev); 3488 3489 if (!IS_ERR_OR_NULL(idev)) { 3490 idev->if_flags |= IF_READY; 3491 run_pending = 1; 3492 } 3493 } else if (event == NETDEV_CHANGE) { 3494 if (!addrconf_link_ready(dev)) { 3495 /* device is still not ready. */ 3496 rt6_sync_down_dev(dev, event); 3497 break; 3498 } 3499 3500 if (idev) { 3501 if (idev->if_flags & IF_READY) { 3502 /* device is already configured - 3503 * but resend MLD reports, we might 3504 * have roamed and need to update 3505 * multicast snooping switches 3506 */ 3507 ipv6_mc_up(idev); 3508 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3509 break; 3510 } 3511 idev->if_flags |= IF_READY; 3512 } 3513 3514 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3515 dev->name); 3516 3517 run_pending = 1; 3518 } 3519 3520 switch (dev->type) { 3521 #if IS_ENABLED(CONFIG_IPV6_SIT) 3522 case ARPHRD_SIT: 3523 addrconf_sit_config(dev); 3524 break; 3525 #endif 3526 #if IS_ENABLED(CONFIG_NET_IPGRE) 3527 case ARPHRD_IPGRE: 3528 addrconf_gre_config(dev); 3529 break; 3530 #endif 3531 case ARPHRD_LOOPBACK: 3532 init_loopback(dev); 3533 break; 3534 3535 default: 3536 addrconf_dev_config(dev); 3537 break; 3538 } 3539 3540 if (!IS_ERR_OR_NULL(idev)) { 3541 if (run_pending) 3542 addrconf_dad_run(idev); 3543 3544 /* Device has an address by now */ 3545 rt6_sync_up(dev, RTNH_F_DEAD); 3546 3547 /* 3548 * If the MTU changed during the interface down, 3549 * when the interface up, the changed MTU must be 3550 * reflected in the idev as well as routers. 3551 */ 3552 if (idev->cnf.mtu6 != dev->mtu && 3553 dev->mtu >= IPV6_MIN_MTU) { 3554 rt6_mtu_change(dev, dev->mtu); 3555 idev->cnf.mtu6 = dev->mtu; 3556 } 3557 idev->tstamp = jiffies; 3558 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3559 3560 /* 3561 * If the changed mtu during down is lower than 3562 * IPV6_MIN_MTU stop IPv6 on this interface. 3563 */ 3564 if (dev->mtu < IPV6_MIN_MTU) 3565 addrconf_ifdown(dev, dev != net->loopback_dev); 3566 } 3567 break; 3568 3569 case NETDEV_DOWN: 3570 case NETDEV_UNREGISTER: 3571 /* 3572 * Remove all addresses from this interface. 3573 */ 3574 addrconf_ifdown(dev, event != NETDEV_DOWN); 3575 break; 3576 3577 case NETDEV_CHANGENAME: 3578 if (idev) { 3579 snmp6_unregister_dev(idev); 3580 addrconf_sysctl_unregister(idev); 3581 err = addrconf_sysctl_register(idev); 3582 if (err) 3583 return notifier_from_errno(err); 3584 err = snmp6_register_dev(idev); 3585 if (err) { 3586 addrconf_sysctl_unregister(idev); 3587 return notifier_from_errno(err); 3588 } 3589 } 3590 break; 3591 3592 case NETDEV_PRE_TYPE_CHANGE: 3593 case NETDEV_POST_TYPE_CHANGE: 3594 if (idev) 3595 addrconf_type_change(dev, event); 3596 break; 3597 3598 case NETDEV_CHANGEUPPER: 3599 info = ptr; 3600 3601 /* flush all routes if dev is linked to or unlinked from 3602 * an L3 master device (e.g., VRF) 3603 */ 3604 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3605 addrconf_ifdown(dev, 0); 3606 } 3607 3608 return NOTIFY_OK; 3609 } 3610 3611 /* 3612 * addrconf module should be notified of a device going up 3613 */ 3614 static struct notifier_block ipv6_dev_notf = { 3615 .notifier_call = addrconf_notify, 3616 .priority = ADDRCONF_NOTIFY_PRIORITY, 3617 }; 3618 3619 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3620 { 3621 struct inet6_dev *idev; 3622 ASSERT_RTNL(); 3623 3624 idev = __in6_dev_get(dev); 3625 3626 if (event == NETDEV_POST_TYPE_CHANGE) 3627 ipv6_mc_remap(idev); 3628 else if (event == NETDEV_PRE_TYPE_CHANGE) 3629 ipv6_mc_unmap(idev); 3630 } 3631 3632 static bool addr_is_local(const struct in6_addr *addr) 3633 { 3634 return ipv6_addr_type(addr) & 3635 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3636 } 3637 3638 static int addrconf_ifdown(struct net_device *dev, int how) 3639 { 3640 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3641 struct net *net = dev_net(dev); 3642 struct inet6_dev *idev; 3643 struct inet6_ifaddr *ifa, *tmp; 3644 bool keep_addr = false; 3645 int state, i; 3646 3647 ASSERT_RTNL(); 3648 3649 rt6_disable_ip(dev, event); 3650 3651 idev = __in6_dev_get(dev); 3652 if (!idev) 3653 return -ENODEV; 3654 3655 /* 3656 * Step 1: remove reference to ipv6 device from parent device. 3657 * Do not dev_put! 3658 */ 3659 if (how) { 3660 idev->dead = 1; 3661 3662 /* protected by rtnl_lock */ 3663 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3664 3665 /* Step 1.5: remove snmp6 entry */ 3666 snmp6_unregister_dev(idev); 3667 3668 } 3669 3670 /* combine the user config with event to determine if permanent 3671 * addresses are to be removed from address hash table 3672 */ 3673 if (!how && !idev->cnf.disable_ipv6) { 3674 /* aggregate the system setting and interface setting */ 3675 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3676 3677 if (!_keep_addr) 3678 _keep_addr = idev->cnf.keep_addr_on_down; 3679 3680 keep_addr = (_keep_addr > 0); 3681 } 3682 3683 /* Step 2: clear hash table */ 3684 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3685 struct hlist_head *h = &inet6_addr_lst[i]; 3686 3687 spin_lock_bh(&addrconf_hash_lock); 3688 restart: 3689 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3690 if (ifa->idev == idev) { 3691 addrconf_del_dad_work(ifa); 3692 /* combined flag + permanent flag decide if 3693 * address is retained on a down event 3694 */ 3695 if (!keep_addr || 3696 !(ifa->flags & IFA_F_PERMANENT) || 3697 addr_is_local(&ifa->addr)) { 3698 hlist_del_init_rcu(&ifa->addr_lst); 3699 goto restart; 3700 } 3701 } 3702 } 3703 spin_unlock_bh(&addrconf_hash_lock); 3704 } 3705 3706 write_lock_bh(&idev->lock); 3707 3708 addrconf_del_rs_timer(idev); 3709 3710 /* Step 2: clear flags for stateless addrconf */ 3711 if (!how) 3712 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3713 3714 /* Step 3: clear tempaddr list */ 3715 while (!list_empty(&idev->tempaddr_list)) { 3716 ifa = list_first_entry(&idev->tempaddr_list, 3717 struct inet6_ifaddr, tmp_list); 3718 list_del(&ifa->tmp_list); 3719 write_unlock_bh(&idev->lock); 3720 spin_lock_bh(&ifa->lock); 3721 3722 if (ifa->ifpub) { 3723 in6_ifa_put(ifa->ifpub); 3724 ifa->ifpub = NULL; 3725 } 3726 spin_unlock_bh(&ifa->lock); 3727 in6_ifa_put(ifa); 3728 write_lock_bh(&idev->lock); 3729 } 3730 3731 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3732 struct fib6_info *rt = NULL; 3733 bool keep; 3734 3735 addrconf_del_dad_work(ifa); 3736 3737 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3738 !addr_is_local(&ifa->addr); 3739 3740 write_unlock_bh(&idev->lock); 3741 spin_lock_bh(&ifa->lock); 3742 3743 if (keep) { 3744 /* set state to skip the notifier below */ 3745 state = INET6_IFADDR_STATE_DEAD; 3746 ifa->state = INET6_IFADDR_STATE_PREDAD; 3747 if (!(ifa->flags & IFA_F_NODAD)) 3748 ifa->flags |= IFA_F_TENTATIVE; 3749 3750 rt = ifa->rt; 3751 ifa->rt = NULL; 3752 } else { 3753 state = ifa->state; 3754 ifa->state = INET6_IFADDR_STATE_DEAD; 3755 } 3756 3757 spin_unlock_bh(&ifa->lock); 3758 3759 if (rt) 3760 ip6_del_rt(net, rt); 3761 3762 if (state != INET6_IFADDR_STATE_DEAD) { 3763 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3764 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3765 } else { 3766 if (idev->cnf.forwarding) 3767 addrconf_leave_anycast(ifa); 3768 addrconf_leave_solict(ifa->idev, &ifa->addr); 3769 } 3770 3771 write_lock_bh(&idev->lock); 3772 if (!keep) { 3773 list_del_rcu(&ifa->if_list); 3774 in6_ifa_put(ifa); 3775 } 3776 } 3777 3778 write_unlock_bh(&idev->lock); 3779 3780 /* Step 5: Discard anycast and multicast list */ 3781 if (how) { 3782 ipv6_ac_destroy_dev(idev); 3783 ipv6_mc_destroy_dev(idev); 3784 } else { 3785 ipv6_mc_down(idev); 3786 } 3787 3788 idev->tstamp = jiffies; 3789 3790 /* Last: Shot the device (if unregistered) */ 3791 if (how) { 3792 addrconf_sysctl_unregister(idev); 3793 neigh_parms_release(&nd_tbl, idev->nd_parms); 3794 neigh_ifdown(&nd_tbl, dev); 3795 in6_dev_put(idev); 3796 } 3797 return 0; 3798 } 3799 3800 static void addrconf_rs_timer(struct timer_list *t) 3801 { 3802 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3803 struct net_device *dev = idev->dev; 3804 struct in6_addr lladdr; 3805 3806 write_lock(&idev->lock); 3807 if (idev->dead || !(idev->if_flags & IF_READY)) 3808 goto out; 3809 3810 if (!ipv6_accept_ra(idev)) 3811 goto out; 3812 3813 /* Announcement received after solicitation was sent */ 3814 if (idev->if_flags & IF_RA_RCVD) 3815 goto out; 3816 3817 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3818 write_unlock(&idev->lock); 3819 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3820 ndisc_send_rs(dev, &lladdr, 3821 &in6addr_linklocal_allrouters); 3822 else 3823 goto put; 3824 3825 write_lock(&idev->lock); 3826 idev->rs_interval = rfc3315_s14_backoff_update( 3827 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3828 /* The wait after the last probe can be shorter */ 3829 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3830 idev->cnf.rtr_solicits) ? 3831 idev->cnf.rtr_solicit_delay : 3832 idev->rs_interval); 3833 } else { 3834 /* 3835 * Note: we do not support deprecated "all on-link" 3836 * assumption any longer. 3837 */ 3838 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3839 } 3840 3841 out: 3842 write_unlock(&idev->lock); 3843 put: 3844 in6_dev_put(idev); 3845 } 3846 3847 /* 3848 * Duplicate Address Detection 3849 */ 3850 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3851 { 3852 unsigned long rand_num; 3853 struct inet6_dev *idev = ifp->idev; 3854 u64 nonce; 3855 3856 if (ifp->flags & IFA_F_OPTIMISTIC) 3857 rand_num = 0; 3858 else 3859 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3860 3861 nonce = 0; 3862 if (idev->cnf.enhanced_dad || 3863 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3864 do 3865 get_random_bytes(&nonce, 6); 3866 while (nonce == 0); 3867 } 3868 ifp->dad_nonce = nonce; 3869 ifp->dad_probes = idev->cnf.dad_transmits; 3870 addrconf_mod_dad_work(ifp, rand_num); 3871 } 3872 3873 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3874 { 3875 struct inet6_dev *idev = ifp->idev; 3876 struct net_device *dev = idev->dev; 3877 bool bump_id, notify = false; 3878 struct net *net; 3879 3880 addrconf_join_solict(dev, &ifp->addr); 3881 3882 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3883 3884 read_lock_bh(&idev->lock); 3885 spin_lock(&ifp->lock); 3886 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3887 goto out; 3888 3889 net = dev_net(dev); 3890 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3891 (net->ipv6.devconf_all->accept_dad < 1 && 3892 idev->cnf.accept_dad < 1) || 3893 !(ifp->flags&IFA_F_TENTATIVE) || 3894 ifp->flags & IFA_F_NODAD) { 3895 bool send_na = false; 3896 3897 if (ifp->flags & IFA_F_TENTATIVE && 3898 !(ifp->flags & IFA_F_OPTIMISTIC)) 3899 send_na = true; 3900 bump_id = ifp->flags & IFA_F_TENTATIVE; 3901 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3902 spin_unlock(&ifp->lock); 3903 read_unlock_bh(&idev->lock); 3904 3905 addrconf_dad_completed(ifp, bump_id, send_na); 3906 return; 3907 } 3908 3909 if (!(idev->if_flags & IF_READY)) { 3910 spin_unlock(&ifp->lock); 3911 read_unlock_bh(&idev->lock); 3912 /* 3913 * If the device is not ready: 3914 * - keep it tentative if it is a permanent address. 3915 * - otherwise, kill it. 3916 */ 3917 in6_ifa_hold(ifp); 3918 addrconf_dad_stop(ifp, 0); 3919 return; 3920 } 3921 3922 /* 3923 * Optimistic nodes can start receiving 3924 * Frames right away 3925 */ 3926 if (ifp->flags & IFA_F_OPTIMISTIC) { 3927 ip6_ins_rt(net, ifp->rt); 3928 if (ipv6_use_optimistic_addr(net, idev)) { 3929 /* Because optimistic nodes can use this address, 3930 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3931 */ 3932 notify = true; 3933 } 3934 } 3935 3936 addrconf_dad_kick(ifp); 3937 out: 3938 spin_unlock(&ifp->lock); 3939 read_unlock_bh(&idev->lock); 3940 if (notify) 3941 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3942 } 3943 3944 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3945 { 3946 bool begin_dad = false; 3947 3948 spin_lock_bh(&ifp->lock); 3949 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3950 ifp->state = INET6_IFADDR_STATE_PREDAD; 3951 begin_dad = true; 3952 } 3953 spin_unlock_bh(&ifp->lock); 3954 3955 if (begin_dad) 3956 addrconf_mod_dad_work(ifp, 0); 3957 } 3958 3959 static void addrconf_dad_work(struct work_struct *w) 3960 { 3961 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3962 struct inet6_ifaddr, 3963 dad_work); 3964 struct inet6_dev *idev = ifp->idev; 3965 bool bump_id, disable_ipv6 = false; 3966 struct in6_addr mcaddr; 3967 3968 enum { 3969 DAD_PROCESS, 3970 DAD_BEGIN, 3971 DAD_ABORT, 3972 } action = DAD_PROCESS; 3973 3974 rtnl_lock(); 3975 3976 spin_lock_bh(&ifp->lock); 3977 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3978 action = DAD_BEGIN; 3979 ifp->state = INET6_IFADDR_STATE_DAD; 3980 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3981 action = DAD_ABORT; 3982 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3983 3984 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3985 idev->cnf.accept_dad > 1) && 3986 !idev->cnf.disable_ipv6 && 3987 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3988 struct in6_addr addr; 3989 3990 addr.s6_addr32[0] = htonl(0xfe800000); 3991 addr.s6_addr32[1] = 0; 3992 3993 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3994 ipv6_addr_equal(&ifp->addr, &addr)) { 3995 /* DAD failed for link-local based on MAC */ 3996 idev->cnf.disable_ipv6 = 1; 3997 3998 pr_info("%s: IPv6 being disabled!\n", 3999 ifp->idev->dev->name); 4000 disable_ipv6 = true; 4001 } 4002 } 4003 } 4004 spin_unlock_bh(&ifp->lock); 4005 4006 if (action == DAD_BEGIN) { 4007 addrconf_dad_begin(ifp); 4008 goto out; 4009 } else if (action == DAD_ABORT) { 4010 in6_ifa_hold(ifp); 4011 addrconf_dad_stop(ifp, 1); 4012 if (disable_ipv6) 4013 addrconf_ifdown(idev->dev, 0); 4014 goto out; 4015 } 4016 4017 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4018 goto out; 4019 4020 write_lock_bh(&idev->lock); 4021 if (idev->dead || !(idev->if_flags & IF_READY)) { 4022 write_unlock_bh(&idev->lock); 4023 goto out; 4024 } 4025 4026 spin_lock(&ifp->lock); 4027 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4028 spin_unlock(&ifp->lock); 4029 write_unlock_bh(&idev->lock); 4030 goto out; 4031 } 4032 4033 if (ifp->dad_probes == 0) { 4034 bool send_na = false; 4035 4036 /* 4037 * DAD was successful 4038 */ 4039 4040 if (ifp->flags & IFA_F_TENTATIVE && 4041 !(ifp->flags & IFA_F_OPTIMISTIC)) 4042 send_na = true; 4043 bump_id = ifp->flags & IFA_F_TENTATIVE; 4044 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4045 spin_unlock(&ifp->lock); 4046 write_unlock_bh(&idev->lock); 4047 4048 addrconf_dad_completed(ifp, bump_id, send_na); 4049 4050 goto out; 4051 } 4052 4053 ifp->dad_probes--; 4054 addrconf_mod_dad_work(ifp, 4055 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4056 spin_unlock(&ifp->lock); 4057 write_unlock_bh(&idev->lock); 4058 4059 /* send a neighbour solicitation for our addr */ 4060 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4061 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4062 ifp->dad_nonce); 4063 out: 4064 in6_ifa_put(ifp); 4065 rtnl_unlock(); 4066 } 4067 4068 /* ifp->idev must be at least read locked */ 4069 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4070 { 4071 struct inet6_ifaddr *ifpiter; 4072 struct inet6_dev *idev = ifp->idev; 4073 4074 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4075 if (ifpiter->scope > IFA_LINK) 4076 break; 4077 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4078 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4079 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4080 IFA_F_PERMANENT) 4081 return false; 4082 } 4083 return true; 4084 } 4085 4086 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4087 bool send_na) 4088 { 4089 struct net_device *dev = ifp->idev->dev; 4090 struct in6_addr lladdr; 4091 bool send_rs, send_mld; 4092 4093 addrconf_del_dad_work(ifp); 4094 4095 /* 4096 * Configure the address for reception. Now it is valid. 4097 */ 4098 4099 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4100 4101 /* If added prefix is link local and we are prepared to process 4102 router advertisements, start sending router solicitations. 4103 */ 4104 4105 read_lock_bh(&ifp->idev->lock); 4106 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4107 send_rs = send_mld && 4108 ipv6_accept_ra(ifp->idev) && 4109 ifp->idev->cnf.rtr_solicits != 0 && 4110 (dev->flags&IFF_LOOPBACK) == 0; 4111 read_unlock_bh(&ifp->idev->lock); 4112 4113 /* While dad is in progress mld report's source address is in6_addrany. 4114 * Resend with proper ll now. 4115 */ 4116 if (send_mld) 4117 ipv6_mc_dad_complete(ifp->idev); 4118 4119 /* send unsolicited NA if enabled */ 4120 if (send_na && 4121 (ifp->idev->cnf.ndisc_notify || 4122 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4123 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4124 /*router=*/ !!ifp->idev->cnf.forwarding, 4125 /*solicited=*/ false, /*override=*/ true, 4126 /*inc_opt=*/ true); 4127 } 4128 4129 if (send_rs) { 4130 /* 4131 * If a host as already performed a random delay 4132 * [...] as part of DAD [...] there is no need 4133 * to delay again before sending the first RS 4134 */ 4135 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4136 return; 4137 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4138 4139 write_lock_bh(&ifp->idev->lock); 4140 spin_lock(&ifp->lock); 4141 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4142 ifp->idev->cnf.rtr_solicit_interval); 4143 ifp->idev->rs_probes = 1; 4144 ifp->idev->if_flags |= IF_RS_SENT; 4145 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4146 spin_unlock(&ifp->lock); 4147 write_unlock_bh(&ifp->idev->lock); 4148 } 4149 4150 if (bump_id) 4151 rt_genid_bump_ipv6(dev_net(dev)); 4152 4153 /* Make sure that a new temporary address will be created 4154 * before this temporary address becomes deprecated. 4155 */ 4156 if (ifp->flags & IFA_F_TEMPORARY) 4157 addrconf_verify_rtnl(); 4158 } 4159 4160 static void addrconf_dad_run(struct inet6_dev *idev) 4161 { 4162 struct inet6_ifaddr *ifp; 4163 4164 read_lock_bh(&idev->lock); 4165 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4166 spin_lock(&ifp->lock); 4167 if (ifp->flags & IFA_F_TENTATIVE && 4168 ifp->state == INET6_IFADDR_STATE_DAD) 4169 addrconf_dad_kick(ifp); 4170 spin_unlock(&ifp->lock); 4171 } 4172 read_unlock_bh(&idev->lock); 4173 } 4174 4175 #ifdef CONFIG_PROC_FS 4176 struct if6_iter_state { 4177 struct seq_net_private p; 4178 int bucket; 4179 int offset; 4180 }; 4181 4182 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4183 { 4184 struct if6_iter_state *state = seq->private; 4185 struct net *net = seq_file_net(seq); 4186 struct inet6_ifaddr *ifa = NULL; 4187 int p = 0; 4188 4189 /* initial bucket if pos is 0 */ 4190 if (pos == 0) { 4191 state->bucket = 0; 4192 state->offset = 0; 4193 } 4194 4195 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4196 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4197 addr_lst) { 4198 if (!net_eq(dev_net(ifa->idev->dev), net)) 4199 continue; 4200 /* sync with offset */ 4201 if (p < state->offset) { 4202 p++; 4203 continue; 4204 } 4205 state->offset++; 4206 return ifa; 4207 } 4208 4209 /* prepare for next bucket */ 4210 state->offset = 0; 4211 p = 0; 4212 } 4213 return NULL; 4214 } 4215 4216 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4217 struct inet6_ifaddr *ifa) 4218 { 4219 struct if6_iter_state *state = seq->private; 4220 struct net *net = seq_file_net(seq); 4221 4222 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4223 if (!net_eq(dev_net(ifa->idev->dev), net)) 4224 continue; 4225 state->offset++; 4226 return ifa; 4227 } 4228 4229 while (++state->bucket < IN6_ADDR_HSIZE) { 4230 state->offset = 0; 4231 hlist_for_each_entry_rcu(ifa, 4232 &inet6_addr_lst[state->bucket], addr_lst) { 4233 if (!net_eq(dev_net(ifa->idev->dev), net)) 4234 continue; 4235 state->offset++; 4236 return ifa; 4237 } 4238 } 4239 4240 return NULL; 4241 } 4242 4243 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4244 __acquires(rcu) 4245 { 4246 rcu_read_lock(); 4247 return if6_get_first(seq, *pos); 4248 } 4249 4250 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4251 { 4252 struct inet6_ifaddr *ifa; 4253 4254 ifa = if6_get_next(seq, v); 4255 ++*pos; 4256 return ifa; 4257 } 4258 4259 static void if6_seq_stop(struct seq_file *seq, void *v) 4260 __releases(rcu) 4261 { 4262 rcu_read_unlock(); 4263 } 4264 4265 static int if6_seq_show(struct seq_file *seq, void *v) 4266 { 4267 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4268 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4269 &ifp->addr, 4270 ifp->idev->dev->ifindex, 4271 ifp->prefix_len, 4272 ifp->scope, 4273 (u8) ifp->flags, 4274 ifp->idev->dev->name); 4275 return 0; 4276 } 4277 4278 static const struct seq_operations if6_seq_ops = { 4279 .start = if6_seq_start, 4280 .next = if6_seq_next, 4281 .show = if6_seq_show, 4282 .stop = if6_seq_stop, 4283 }; 4284 4285 static int __net_init if6_proc_net_init(struct net *net) 4286 { 4287 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4288 sizeof(struct if6_iter_state))) 4289 return -ENOMEM; 4290 return 0; 4291 } 4292 4293 static void __net_exit if6_proc_net_exit(struct net *net) 4294 { 4295 remove_proc_entry("if_inet6", net->proc_net); 4296 } 4297 4298 static struct pernet_operations if6_proc_net_ops = { 4299 .init = if6_proc_net_init, 4300 .exit = if6_proc_net_exit, 4301 }; 4302 4303 int __init if6_proc_init(void) 4304 { 4305 return register_pernet_subsys(&if6_proc_net_ops); 4306 } 4307 4308 void if6_proc_exit(void) 4309 { 4310 unregister_pernet_subsys(&if6_proc_net_ops); 4311 } 4312 #endif /* CONFIG_PROC_FS */ 4313 4314 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4315 /* Check if address is a home address configured on any interface. */ 4316 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4317 { 4318 unsigned int hash = inet6_addr_hash(net, addr); 4319 struct inet6_ifaddr *ifp = NULL; 4320 int ret = 0; 4321 4322 rcu_read_lock(); 4323 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4324 if (!net_eq(dev_net(ifp->idev->dev), net)) 4325 continue; 4326 if (ipv6_addr_equal(&ifp->addr, addr) && 4327 (ifp->flags & IFA_F_HOMEADDRESS)) { 4328 ret = 1; 4329 break; 4330 } 4331 } 4332 rcu_read_unlock(); 4333 return ret; 4334 } 4335 #endif 4336 4337 /* 4338 * Periodic address status verification 4339 */ 4340 4341 static void addrconf_verify_rtnl(void) 4342 { 4343 unsigned long now, next, next_sec, next_sched; 4344 struct inet6_ifaddr *ifp; 4345 int i; 4346 4347 ASSERT_RTNL(); 4348 4349 rcu_read_lock_bh(); 4350 now = jiffies; 4351 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4352 4353 cancel_delayed_work(&addr_chk_work); 4354 4355 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4356 restart: 4357 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4358 unsigned long age; 4359 4360 /* When setting preferred_lft to a value not zero or 4361 * infinity, while valid_lft is infinity 4362 * IFA_F_PERMANENT has a non-infinity life time. 4363 */ 4364 if ((ifp->flags & IFA_F_PERMANENT) && 4365 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4366 continue; 4367 4368 spin_lock(&ifp->lock); 4369 /* We try to batch several events at once. */ 4370 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4371 4372 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4373 age >= ifp->valid_lft) { 4374 spin_unlock(&ifp->lock); 4375 in6_ifa_hold(ifp); 4376 ipv6_del_addr(ifp); 4377 goto restart; 4378 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4379 spin_unlock(&ifp->lock); 4380 continue; 4381 } else if (age >= ifp->prefered_lft) { 4382 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4383 int deprecate = 0; 4384 4385 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4386 deprecate = 1; 4387 ifp->flags |= IFA_F_DEPRECATED; 4388 } 4389 4390 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4391 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4392 next = ifp->tstamp + ifp->valid_lft * HZ; 4393 4394 spin_unlock(&ifp->lock); 4395 4396 if (deprecate) { 4397 in6_ifa_hold(ifp); 4398 4399 ipv6_ifa_notify(0, ifp); 4400 in6_ifa_put(ifp); 4401 goto restart; 4402 } 4403 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4404 !(ifp->flags&IFA_F_TENTATIVE)) { 4405 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4406 ifp->idev->cnf.dad_transmits * 4407 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4408 4409 if (age >= ifp->prefered_lft - regen_advance) { 4410 struct inet6_ifaddr *ifpub = ifp->ifpub; 4411 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4412 next = ifp->tstamp + ifp->prefered_lft * HZ; 4413 if (!ifp->regen_count && ifpub) { 4414 ifp->regen_count++; 4415 in6_ifa_hold(ifp); 4416 in6_ifa_hold(ifpub); 4417 spin_unlock(&ifp->lock); 4418 4419 spin_lock(&ifpub->lock); 4420 ifpub->regen_count = 0; 4421 spin_unlock(&ifpub->lock); 4422 rcu_read_unlock_bh(); 4423 ipv6_create_tempaddr(ifpub, ifp, true); 4424 in6_ifa_put(ifpub); 4425 in6_ifa_put(ifp); 4426 rcu_read_lock_bh(); 4427 goto restart; 4428 } 4429 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4430 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4431 spin_unlock(&ifp->lock); 4432 } else { 4433 /* ifp->prefered_lft <= ifp->valid_lft */ 4434 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4435 next = ifp->tstamp + ifp->prefered_lft * HZ; 4436 spin_unlock(&ifp->lock); 4437 } 4438 } 4439 } 4440 4441 next_sec = round_jiffies_up(next); 4442 next_sched = next; 4443 4444 /* If rounded timeout is accurate enough, accept it. */ 4445 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4446 next_sched = next_sec; 4447 4448 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4449 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4450 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4451 4452 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4453 now, next, next_sec, next_sched); 4454 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4455 rcu_read_unlock_bh(); 4456 } 4457 4458 static void addrconf_verify_work(struct work_struct *w) 4459 { 4460 rtnl_lock(); 4461 addrconf_verify_rtnl(); 4462 rtnl_unlock(); 4463 } 4464 4465 static void addrconf_verify(void) 4466 { 4467 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4468 } 4469 4470 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4471 struct in6_addr **peer_pfx) 4472 { 4473 struct in6_addr *pfx = NULL; 4474 4475 *peer_pfx = NULL; 4476 4477 if (addr) 4478 pfx = nla_data(addr); 4479 4480 if (local) { 4481 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4482 *peer_pfx = pfx; 4483 pfx = nla_data(local); 4484 } 4485 4486 return pfx; 4487 } 4488 4489 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4490 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4491 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4492 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4493 [IFA_FLAGS] = { .len = sizeof(u32) }, 4494 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4495 }; 4496 4497 static int 4498 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4499 struct netlink_ext_ack *extack) 4500 { 4501 struct net *net = sock_net(skb->sk); 4502 struct ifaddrmsg *ifm; 4503 struct nlattr *tb[IFA_MAX+1]; 4504 struct in6_addr *pfx, *peer_pfx; 4505 u32 ifa_flags; 4506 int err; 4507 4508 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4509 extack); 4510 if (err < 0) 4511 return err; 4512 4513 ifm = nlmsg_data(nlh); 4514 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4515 if (!pfx) 4516 return -EINVAL; 4517 4518 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4519 4520 /* We ignore other flags so far. */ 4521 ifa_flags &= IFA_F_MANAGETEMPADDR; 4522 4523 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4524 ifm->ifa_prefixlen); 4525 } 4526 4527 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4528 unsigned long expires, u32 flags) 4529 { 4530 struct fib6_info *f6i; 4531 4532 f6i = addrconf_get_prefix_route(&ifp->addr, 4533 ifp->prefix_len, 4534 ifp->idev->dev, 4535 0, RTF_GATEWAY | RTF_DEFAULT); 4536 if (!f6i) 4537 return -ENOENT; 4538 4539 if (f6i->fib6_metric != ifp->rt_priority) { 4540 /* add new one */ 4541 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4542 ifp->rt_priority, ifp->idev->dev, 4543 expires, flags, GFP_KERNEL); 4544 /* delete old one */ 4545 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4546 } else { 4547 if (!expires) 4548 fib6_clean_expires(f6i); 4549 else 4550 fib6_set_expires(f6i, expires); 4551 4552 fib6_info_release(f6i); 4553 } 4554 4555 return 0; 4556 } 4557 4558 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4559 { 4560 u32 flags; 4561 clock_t expires; 4562 unsigned long timeout; 4563 bool was_managetempaddr; 4564 bool had_prefixroute; 4565 4566 ASSERT_RTNL(); 4567 4568 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4569 return -EINVAL; 4570 4571 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4572 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4573 return -EINVAL; 4574 4575 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4576 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4577 4578 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4579 if (addrconf_finite_timeout(timeout)) { 4580 expires = jiffies_to_clock_t(timeout * HZ); 4581 cfg->valid_lft = timeout; 4582 flags = RTF_EXPIRES; 4583 } else { 4584 expires = 0; 4585 flags = 0; 4586 cfg->ifa_flags |= IFA_F_PERMANENT; 4587 } 4588 4589 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4590 if (addrconf_finite_timeout(timeout)) { 4591 if (timeout == 0) 4592 cfg->ifa_flags |= IFA_F_DEPRECATED; 4593 cfg->preferred_lft = timeout; 4594 } 4595 4596 spin_lock_bh(&ifp->lock); 4597 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4598 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4599 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4600 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4601 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4602 IFA_F_NOPREFIXROUTE); 4603 ifp->flags |= cfg->ifa_flags; 4604 ifp->tstamp = jiffies; 4605 ifp->valid_lft = cfg->valid_lft; 4606 ifp->prefered_lft = cfg->preferred_lft; 4607 4608 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4609 ifp->rt_priority = cfg->rt_priority; 4610 4611 spin_unlock_bh(&ifp->lock); 4612 if (!(ifp->flags&IFA_F_TENTATIVE)) 4613 ipv6_ifa_notify(0, ifp); 4614 4615 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4616 int rc = -ENOENT; 4617 4618 if (had_prefixroute) 4619 rc = modify_prefix_route(ifp, expires, flags); 4620 4621 /* prefix route could have been deleted; if so restore it */ 4622 if (rc == -ENOENT) { 4623 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4624 ifp->rt_priority, ifp->idev->dev, 4625 expires, flags, GFP_KERNEL); 4626 } 4627 } else if (had_prefixroute) { 4628 enum cleanup_prefix_rt_t action; 4629 unsigned long rt_expires; 4630 4631 write_lock_bh(&ifp->idev->lock); 4632 action = check_cleanup_prefix_route(ifp, &rt_expires); 4633 write_unlock_bh(&ifp->idev->lock); 4634 4635 if (action != CLEANUP_PREFIX_RT_NOP) { 4636 cleanup_prefix_route(ifp, rt_expires, 4637 action == CLEANUP_PREFIX_RT_DEL); 4638 } 4639 } 4640 4641 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4642 if (was_managetempaddr && 4643 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4644 cfg->valid_lft = 0; 4645 cfg->preferred_lft = 0; 4646 } 4647 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4648 cfg->preferred_lft, !was_managetempaddr, 4649 jiffies); 4650 } 4651 4652 addrconf_verify_rtnl(); 4653 4654 return 0; 4655 } 4656 4657 static int 4658 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4659 struct netlink_ext_ack *extack) 4660 { 4661 struct net *net = sock_net(skb->sk); 4662 struct ifaddrmsg *ifm; 4663 struct nlattr *tb[IFA_MAX+1]; 4664 struct in6_addr *peer_pfx; 4665 struct inet6_ifaddr *ifa; 4666 struct net_device *dev; 4667 struct inet6_dev *idev; 4668 struct ifa6_config cfg; 4669 int err; 4670 4671 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4672 extack); 4673 if (err < 0) 4674 return err; 4675 4676 memset(&cfg, 0, sizeof(cfg)); 4677 4678 ifm = nlmsg_data(nlh); 4679 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4680 if (!cfg.pfx) 4681 return -EINVAL; 4682 4683 cfg.peer_pfx = peer_pfx; 4684 cfg.plen = ifm->ifa_prefixlen; 4685 if (tb[IFA_RT_PRIORITY]) 4686 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4687 4688 cfg.valid_lft = INFINITY_LIFE_TIME; 4689 cfg.preferred_lft = INFINITY_LIFE_TIME; 4690 4691 if (tb[IFA_CACHEINFO]) { 4692 struct ifa_cacheinfo *ci; 4693 4694 ci = nla_data(tb[IFA_CACHEINFO]); 4695 cfg.valid_lft = ci->ifa_valid; 4696 cfg.preferred_lft = ci->ifa_prefered; 4697 } 4698 4699 dev = __dev_get_by_index(net, ifm->ifa_index); 4700 if (!dev) 4701 return -ENODEV; 4702 4703 if (tb[IFA_FLAGS]) 4704 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4705 else 4706 cfg.ifa_flags = ifm->ifa_flags; 4707 4708 /* We ignore other flags so far. */ 4709 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4710 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4711 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4712 4713 idev = ipv6_find_idev(dev); 4714 if (IS_ERR(idev)) 4715 return PTR_ERR(idev); 4716 4717 if (!ipv6_allow_optimistic_dad(net, idev)) 4718 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4719 4720 if (cfg.ifa_flags & IFA_F_NODAD && 4721 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4722 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4723 return -EINVAL; 4724 } 4725 4726 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4727 if (!ifa) { 4728 /* 4729 * It would be best to check for !NLM_F_CREATE here but 4730 * userspace already relies on not having to provide this. 4731 */ 4732 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4733 } 4734 4735 if (nlh->nlmsg_flags & NLM_F_EXCL || 4736 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4737 err = -EEXIST; 4738 else 4739 err = inet6_addr_modify(ifa, &cfg); 4740 4741 in6_ifa_put(ifa); 4742 4743 return err; 4744 } 4745 4746 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4747 u8 scope, int ifindex) 4748 { 4749 struct ifaddrmsg *ifm; 4750 4751 ifm = nlmsg_data(nlh); 4752 ifm->ifa_family = AF_INET6; 4753 ifm->ifa_prefixlen = prefixlen; 4754 ifm->ifa_flags = flags; 4755 ifm->ifa_scope = scope; 4756 ifm->ifa_index = ifindex; 4757 } 4758 4759 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4760 unsigned long tstamp, u32 preferred, u32 valid) 4761 { 4762 struct ifa_cacheinfo ci; 4763 4764 ci.cstamp = cstamp_delta(cstamp); 4765 ci.tstamp = cstamp_delta(tstamp); 4766 ci.ifa_prefered = preferred; 4767 ci.ifa_valid = valid; 4768 4769 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4770 } 4771 4772 static inline int rt_scope(int ifa_scope) 4773 { 4774 if (ifa_scope & IFA_HOST) 4775 return RT_SCOPE_HOST; 4776 else if (ifa_scope & IFA_LINK) 4777 return RT_SCOPE_LINK; 4778 else if (ifa_scope & IFA_SITE) 4779 return RT_SCOPE_SITE; 4780 else 4781 return RT_SCOPE_UNIVERSE; 4782 } 4783 4784 static inline int inet6_ifaddr_msgsize(void) 4785 { 4786 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4787 + nla_total_size(16) /* IFA_LOCAL */ 4788 + nla_total_size(16) /* IFA_ADDRESS */ 4789 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4790 + nla_total_size(4) /* IFA_FLAGS */ 4791 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4792 } 4793 4794 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4795 u32 portid, u32 seq, int event, unsigned int flags) 4796 { 4797 struct nlmsghdr *nlh; 4798 u32 preferred, valid; 4799 4800 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4801 if (!nlh) 4802 return -EMSGSIZE; 4803 4804 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4805 ifa->idev->dev->ifindex); 4806 4807 if (!((ifa->flags&IFA_F_PERMANENT) && 4808 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4809 preferred = ifa->prefered_lft; 4810 valid = ifa->valid_lft; 4811 if (preferred != INFINITY_LIFE_TIME) { 4812 long tval = (jiffies - ifa->tstamp)/HZ; 4813 if (preferred > tval) 4814 preferred -= tval; 4815 else 4816 preferred = 0; 4817 if (valid != INFINITY_LIFE_TIME) { 4818 if (valid > tval) 4819 valid -= tval; 4820 else 4821 valid = 0; 4822 } 4823 } 4824 } else { 4825 preferred = INFINITY_LIFE_TIME; 4826 valid = INFINITY_LIFE_TIME; 4827 } 4828 4829 if (!ipv6_addr_any(&ifa->peer_addr)) { 4830 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4831 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4832 goto error; 4833 } else 4834 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4835 goto error; 4836 4837 if (ifa->rt_priority && 4838 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4839 goto error; 4840 4841 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4842 goto error; 4843 4844 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4845 goto error; 4846 4847 nlmsg_end(skb, nlh); 4848 return 0; 4849 4850 error: 4851 nlmsg_cancel(skb, nlh); 4852 return -EMSGSIZE; 4853 } 4854 4855 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4856 u32 portid, u32 seq, int event, u16 flags) 4857 { 4858 struct nlmsghdr *nlh; 4859 u8 scope = RT_SCOPE_UNIVERSE; 4860 int ifindex = ifmca->idev->dev->ifindex; 4861 4862 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4863 scope = RT_SCOPE_SITE; 4864 4865 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4866 if (!nlh) 4867 return -EMSGSIZE; 4868 4869 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4870 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4871 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4872 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4873 nlmsg_cancel(skb, nlh); 4874 return -EMSGSIZE; 4875 } 4876 4877 nlmsg_end(skb, nlh); 4878 return 0; 4879 } 4880 4881 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4882 u32 portid, u32 seq, int event, unsigned int flags) 4883 { 4884 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4885 int ifindex = dev ? dev->ifindex : 1; 4886 struct nlmsghdr *nlh; 4887 u8 scope = RT_SCOPE_UNIVERSE; 4888 4889 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4890 scope = RT_SCOPE_SITE; 4891 4892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4893 if (!nlh) 4894 return -EMSGSIZE; 4895 4896 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4897 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4898 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4899 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4900 nlmsg_cancel(skb, nlh); 4901 return -EMSGSIZE; 4902 } 4903 4904 nlmsg_end(skb, nlh); 4905 return 0; 4906 } 4907 4908 enum addr_type_t { 4909 UNICAST_ADDR, 4910 MULTICAST_ADDR, 4911 ANYCAST_ADDR, 4912 }; 4913 4914 /* called with rcu_read_lock() */ 4915 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4916 struct netlink_callback *cb, enum addr_type_t type, 4917 int s_ip_idx, int *p_ip_idx) 4918 { 4919 struct ifmcaddr6 *ifmca; 4920 struct ifacaddr6 *ifaca; 4921 int err = 1; 4922 int ip_idx = *p_ip_idx; 4923 4924 read_lock_bh(&idev->lock); 4925 switch (type) { 4926 case UNICAST_ADDR: { 4927 struct inet6_ifaddr *ifa; 4928 4929 /* unicast address incl. temp addr */ 4930 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4931 if (++ip_idx < s_ip_idx) 4932 continue; 4933 err = inet6_fill_ifaddr(skb, ifa, 4934 NETLINK_CB(cb->skb).portid, 4935 cb->nlh->nlmsg_seq, 4936 RTM_NEWADDR, 4937 NLM_F_MULTI); 4938 if (err < 0) 4939 break; 4940 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4941 } 4942 break; 4943 } 4944 case MULTICAST_ADDR: 4945 /* multicast address */ 4946 for (ifmca = idev->mc_list; ifmca; 4947 ifmca = ifmca->next, ip_idx++) { 4948 if (ip_idx < s_ip_idx) 4949 continue; 4950 err = inet6_fill_ifmcaddr(skb, ifmca, 4951 NETLINK_CB(cb->skb).portid, 4952 cb->nlh->nlmsg_seq, 4953 RTM_GETMULTICAST, 4954 NLM_F_MULTI); 4955 if (err < 0) 4956 break; 4957 } 4958 break; 4959 case ANYCAST_ADDR: 4960 /* anycast address */ 4961 for (ifaca = idev->ac_list; ifaca; 4962 ifaca = ifaca->aca_next, ip_idx++) { 4963 if (ip_idx < s_ip_idx) 4964 continue; 4965 err = inet6_fill_ifacaddr(skb, ifaca, 4966 NETLINK_CB(cb->skb).portid, 4967 cb->nlh->nlmsg_seq, 4968 RTM_GETANYCAST, 4969 NLM_F_MULTI); 4970 if (err < 0) 4971 break; 4972 } 4973 break; 4974 default: 4975 break; 4976 } 4977 read_unlock_bh(&idev->lock); 4978 *p_ip_idx = ip_idx; 4979 return err; 4980 } 4981 4982 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4983 enum addr_type_t type) 4984 { 4985 struct net *net = sock_net(skb->sk); 4986 int h, s_h; 4987 int idx, ip_idx; 4988 int s_idx, s_ip_idx; 4989 struct net_device *dev; 4990 struct inet6_dev *idev; 4991 struct hlist_head *head; 4992 4993 s_h = cb->args[0]; 4994 s_idx = idx = cb->args[1]; 4995 s_ip_idx = ip_idx = cb->args[2]; 4996 4997 rcu_read_lock(); 4998 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4999 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5000 idx = 0; 5001 head = &net->dev_index_head[h]; 5002 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5003 if (idx < s_idx) 5004 goto cont; 5005 if (h > s_h || idx > s_idx) 5006 s_ip_idx = 0; 5007 ip_idx = 0; 5008 idev = __in6_dev_get(dev); 5009 if (!idev) 5010 goto cont; 5011 5012 if (in6_dump_addrs(idev, skb, cb, type, 5013 s_ip_idx, &ip_idx) < 0) 5014 goto done; 5015 cont: 5016 idx++; 5017 } 5018 } 5019 done: 5020 rcu_read_unlock(); 5021 cb->args[0] = h; 5022 cb->args[1] = idx; 5023 cb->args[2] = ip_idx; 5024 5025 return skb->len; 5026 } 5027 5028 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5029 { 5030 enum addr_type_t type = UNICAST_ADDR; 5031 5032 return inet6_dump_addr(skb, cb, type); 5033 } 5034 5035 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5036 { 5037 enum addr_type_t type = MULTICAST_ADDR; 5038 5039 return inet6_dump_addr(skb, cb, type); 5040 } 5041 5042 5043 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5044 { 5045 enum addr_type_t type = ANYCAST_ADDR; 5046 5047 return inet6_dump_addr(skb, cb, type); 5048 } 5049 5050 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5051 struct netlink_ext_ack *extack) 5052 { 5053 struct net *net = sock_net(in_skb->sk); 5054 struct ifaddrmsg *ifm; 5055 struct nlattr *tb[IFA_MAX+1]; 5056 struct in6_addr *addr = NULL, *peer; 5057 struct net_device *dev = NULL; 5058 struct inet6_ifaddr *ifa; 5059 struct sk_buff *skb; 5060 int err; 5061 5062 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5063 extack); 5064 if (err < 0) 5065 return err; 5066 5067 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5068 if (!addr) 5069 return -EINVAL; 5070 5071 ifm = nlmsg_data(nlh); 5072 if (ifm->ifa_index) 5073 dev = dev_get_by_index(net, ifm->ifa_index); 5074 5075 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5076 if (!ifa) { 5077 err = -EADDRNOTAVAIL; 5078 goto errout; 5079 } 5080 5081 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5082 if (!skb) { 5083 err = -ENOBUFS; 5084 goto errout_ifa; 5085 } 5086 5087 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5088 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5089 if (err < 0) { 5090 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5091 WARN_ON(err == -EMSGSIZE); 5092 kfree_skb(skb); 5093 goto errout_ifa; 5094 } 5095 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5096 errout_ifa: 5097 in6_ifa_put(ifa); 5098 errout: 5099 if (dev) 5100 dev_put(dev); 5101 return err; 5102 } 5103 5104 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5105 { 5106 struct sk_buff *skb; 5107 struct net *net = dev_net(ifa->idev->dev); 5108 int err = -ENOBUFS; 5109 5110 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5111 if (!skb) 5112 goto errout; 5113 5114 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5115 if (err < 0) { 5116 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5117 WARN_ON(err == -EMSGSIZE); 5118 kfree_skb(skb); 5119 goto errout; 5120 } 5121 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5122 return; 5123 errout: 5124 if (err < 0) 5125 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5126 } 5127 5128 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5129 __s32 *array, int bytes) 5130 { 5131 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5132 5133 memset(array, 0, bytes); 5134 array[DEVCONF_FORWARDING] = cnf->forwarding; 5135 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5136 array[DEVCONF_MTU6] = cnf->mtu6; 5137 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5138 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5139 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5140 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5141 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5142 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5143 jiffies_to_msecs(cnf->rtr_solicit_interval); 5144 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5145 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5146 array[DEVCONF_RTR_SOLICIT_DELAY] = 5147 jiffies_to_msecs(cnf->rtr_solicit_delay); 5148 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5149 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5150 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5151 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5152 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5153 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5154 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5155 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5156 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5157 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5158 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5159 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5160 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5161 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5162 #ifdef CONFIG_IPV6_ROUTER_PREF 5163 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5164 array[DEVCONF_RTR_PROBE_INTERVAL] = 5165 jiffies_to_msecs(cnf->rtr_probe_interval); 5166 #ifdef CONFIG_IPV6_ROUTE_INFO 5167 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5168 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5169 #endif 5170 #endif 5171 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5172 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5174 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5175 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5176 #endif 5177 #ifdef CONFIG_IPV6_MROUTE 5178 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5179 #endif 5180 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5181 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5182 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5183 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5184 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5185 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5186 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5187 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5188 /* we omit DEVCONF_STABLE_SECRET for now */ 5189 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5190 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5191 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5192 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5193 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5194 #ifdef CONFIG_IPV6_SEG6_HMAC 5195 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5196 #endif 5197 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5198 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5199 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5200 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5201 } 5202 5203 static inline size_t inet6_ifla6_size(void) 5204 { 5205 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5206 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5207 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5208 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5209 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5210 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5211 } 5212 5213 static inline size_t inet6_if_nlmsg_size(void) 5214 { 5215 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5216 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5217 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5218 + nla_total_size(4) /* IFLA_MTU */ 5219 + nla_total_size(4) /* IFLA_LINK */ 5220 + nla_total_size(1) /* IFLA_OPERSTATE */ 5221 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5222 } 5223 5224 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5225 int bytes) 5226 { 5227 int i; 5228 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5229 BUG_ON(pad < 0); 5230 5231 /* Use put_unaligned() because stats may not be aligned for u64. */ 5232 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5233 for (i = 1; i < ICMP6_MIB_MAX; i++) 5234 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5235 5236 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5237 } 5238 5239 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5240 int bytes, size_t syncpoff) 5241 { 5242 int i, c; 5243 u64 buff[IPSTATS_MIB_MAX]; 5244 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5245 5246 BUG_ON(pad < 0); 5247 5248 memset(buff, 0, sizeof(buff)); 5249 buff[0] = IPSTATS_MIB_MAX; 5250 5251 for_each_possible_cpu(c) { 5252 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5253 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5254 } 5255 5256 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5257 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5258 } 5259 5260 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5261 int bytes) 5262 { 5263 switch (attrtype) { 5264 case IFLA_INET6_STATS: 5265 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5266 offsetof(struct ipstats_mib, syncp)); 5267 break; 5268 case IFLA_INET6_ICMP6STATS: 5269 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5270 break; 5271 } 5272 } 5273 5274 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5275 u32 ext_filter_mask) 5276 { 5277 struct nlattr *nla; 5278 struct ifla_cacheinfo ci; 5279 5280 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5281 goto nla_put_failure; 5282 ci.max_reasm_len = IPV6_MAXPLEN; 5283 ci.tstamp = cstamp_delta(idev->tstamp); 5284 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5285 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5286 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5287 goto nla_put_failure; 5288 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5289 if (!nla) 5290 goto nla_put_failure; 5291 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5292 5293 /* XXX - MC not implemented */ 5294 5295 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5296 return 0; 5297 5298 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5299 if (!nla) 5300 goto nla_put_failure; 5301 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5302 5303 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5304 if (!nla) 5305 goto nla_put_failure; 5306 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5307 5308 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5309 if (!nla) 5310 goto nla_put_failure; 5311 5312 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5313 goto nla_put_failure; 5314 5315 read_lock_bh(&idev->lock); 5316 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5317 read_unlock_bh(&idev->lock); 5318 5319 return 0; 5320 5321 nla_put_failure: 5322 return -EMSGSIZE; 5323 } 5324 5325 static size_t inet6_get_link_af_size(const struct net_device *dev, 5326 u32 ext_filter_mask) 5327 { 5328 if (!__in6_dev_get(dev)) 5329 return 0; 5330 5331 return inet6_ifla6_size(); 5332 } 5333 5334 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5335 u32 ext_filter_mask) 5336 { 5337 struct inet6_dev *idev = __in6_dev_get(dev); 5338 5339 if (!idev) 5340 return -ENODATA; 5341 5342 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5343 return -EMSGSIZE; 5344 5345 return 0; 5346 } 5347 5348 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5349 { 5350 struct inet6_ifaddr *ifp; 5351 struct net_device *dev = idev->dev; 5352 bool clear_token, update_rs = false; 5353 struct in6_addr ll_addr; 5354 5355 ASSERT_RTNL(); 5356 5357 if (!token) 5358 return -EINVAL; 5359 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5360 return -EINVAL; 5361 if (!ipv6_accept_ra(idev)) 5362 return -EINVAL; 5363 if (idev->cnf.rtr_solicits == 0) 5364 return -EINVAL; 5365 5366 write_lock_bh(&idev->lock); 5367 5368 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5369 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5370 5371 write_unlock_bh(&idev->lock); 5372 5373 clear_token = ipv6_addr_any(token); 5374 if (clear_token) 5375 goto update_lft; 5376 5377 if (!idev->dead && (idev->if_flags & IF_READY) && 5378 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5379 IFA_F_OPTIMISTIC)) { 5380 /* If we're not ready, then normal ifup will take care 5381 * of this. Otherwise, we need to request our rs here. 5382 */ 5383 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5384 update_rs = true; 5385 } 5386 5387 update_lft: 5388 write_lock_bh(&idev->lock); 5389 5390 if (update_rs) { 5391 idev->if_flags |= IF_RS_SENT; 5392 idev->rs_interval = rfc3315_s14_backoff_init( 5393 idev->cnf.rtr_solicit_interval); 5394 idev->rs_probes = 1; 5395 addrconf_mod_rs_timer(idev, idev->rs_interval); 5396 } 5397 5398 /* Well, that's kinda nasty ... */ 5399 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5400 spin_lock(&ifp->lock); 5401 if (ifp->tokenized) { 5402 ifp->valid_lft = 0; 5403 ifp->prefered_lft = 0; 5404 } 5405 spin_unlock(&ifp->lock); 5406 } 5407 5408 write_unlock_bh(&idev->lock); 5409 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5410 addrconf_verify_rtnl(); 5411 return 0; 5412 } 5413 5414 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5415 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5416 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5417 }; 5418 5419 static int inet6_validate_link_af(const struct net_device *dev, 5420 const struct nlattr *nla) 5421 { 5422 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5423 5424 if (dev && !__in6_dev_get(dev)) 5425 return -EAFNOSUPPORT; 5426 5427 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5428 NULL); 5429 } 5430 5431 static int check_addr_gen_mode(int mode) 5432 { 5433 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5434 mode != IN6_ADDR_GEN_MODE_NONE && 5435 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5436 mode != IN6_ADDR_GEN_MODE_RANDOM) 5437 return -EINVAL; 5438 return 1; 5439 } 5440 5441 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5442 int mode) 5443 { 5444 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5445 !idev->cnf.stable_secret.initialized && 5446 !net->ipv6.devconf_dflt->stable_secret.initialized) 5447 return -EINVAL; 5448 return 1; 5449 } 5450 5451 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5452 { 5453 int err = -EINVAL; 5454 struct inet6_dev *idev = __in6_dev_get(dev); 5455 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5456 5457 if (!idev) 5458 return -EAFNOSUPPORT; 5459 5460 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5461 BUG(); 5462 5463 if (tb[IFLA_INET6_TOKEN]) { 5464 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5465 if (err) 5466 return err; 5467 } 5468 5469 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5470 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5471 5472 if (check_addr_gen_mode(mode) < 0 || 5473 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5474 return -EINVAL; 5475 5476 idev->cnf.addr_gen_mode = mode; 5477 err = 0; 5478 } 5479 5480 return err; 5481 } 5482 5483 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5484 u32 portid, u32 seq, int event, unsigned int flags) 5485 { 5486 struct net_device *dev = idev->dev; 5487 struct ifinfomsg *hdr; 5488 struct nlmsghdr *nlh; 5489 void *protoinfo; 5490 5491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5492 if (!nlh) 5493 return -EMSGSIZE; 5494 5495 hdr = nlmsg_data(nlh); 5496 hdr->ifi_family = AF_INET6; 5497 hdr->__ifi_pad = 0; 5498 hdr->ifi_type = dev->type; 5499 hdr->ifi_index = dev->ifindex; 5500 hdr->ifi_flags = dev_get_flags(dev); 5501 hdr->ifi_change = 0; 5502 5503 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5504 (dev->addr_len && 5505 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5506 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5507 (dev->ifindex != dev_get_iflink(dev) && 5508 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5509 nla_put_u8(skb, IFLA_OPERSTATE, 5510 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5511 goto nla_put_failure; 5512 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5513 if (!protoinfo) 5514 goto nla_put_failure; 5515 5516 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5517 goto nla_put_failure; 5518 5519 nla_nest_end(skb, protoinfo); 5520 nlmsg_end(skb, nlh); 5521 return 0; 5522 5523 nla_put_failure: 5524 nlmsg_cancel(skb, nlh); 5525 return -EMSGSIZE; 5526 } 5527 5528 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5529 { 5530 struct net *net = sock_net(skb->sk); 5531 int h, s_h; 5532 int idx = 0, s_idx; 5533 struct net_device *dev; 5534 struct inet6_dev *idev; 5535 struct hlist_head *head; 5536 5537 s_h = cb->args[0]; 5538 s_idx = cb->args[1]; 5539 5540 rcu_read_lock(); 5541 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5542 idx = 0; 5543 head = &net->dev_index_head[h]; 5544 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5545 if (idx < s_idx) 5546 goto cont; 5547 idev = __in6_dev_get(dev); 5548 if (!idev) 5549 goto cont; 5550 if (inet6_fill_ifinfo(skb, idev, 5551 NETLINK_CB(cb->skb).portid, 5552 cb->nlh->nlmsg_seq, 5553 RTM_NEWLINK, NLM_F_MULTI) < 0) 5554 goto out; 5555 cont: 5556 idx++; 5557 } 5558 } 5559 out: 5560 rcu_read_unlock(); 5561 cb->args[1] = idx; 5562 cb->args[0] = h; 5563 5564 return skb->len; 5565 } 5566 5567 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5568 { 5569 struct sk_buff *skb; 5570 struct net *net = dev_net(idev->dev); 5571 int err = -ENOBUFS; 5572 5573 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5574 if (!skb) 5575 goto errout; 5576 5577 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5578 if (err < 0) { 5579 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5580 WARN_ON(err == -EMSGSIZE); 5581 kfree_skb(skb); 5582 goto errout; 5583 } 5584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5585 return; 5586 errout: 5587 if (err < 0) 5588 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5589 } 5590 5591 static inline size_t inet6_prefix_nlmsg_size(void) 5592 { 5593 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5594 + nla_total_size(sizeof(struct in6_addr)) 5595 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5596 } 5597 5598 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5599 struct prefix_info *pinfo, u32 portid, u32 seq, 5600 int event, unsigned int flags) 5601 { 5602 struct prefixmsg *pmsg; 5603 struct nlmsghdr *nlh; 5604 struct prefix_cacheinfo ci; 5605 5606 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5607 if (!nlh) 5608 return -EMSGSIZE; 5609 5610 pmsg = nlmsg_data(nlh); 5611 pmsg->prefix_family = AF_INET6; 5612 pmsg->prefix_pad1 = 0; 5613 pmsg->prefix_pad2 = 0; 5614 pmsg->prefix_ifindex = idev->dev->ifindex; 5615 pmsg->prefix_len = pinfo->prefix_len; 5616 pmsg->prefix_type = pinfo->type; 5617 pmsg->prefix_pad3 = 0; 5618 pmsg->prefix_flags = 0; 5619 if (pinfo->onlink) 5620 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5621 if (pinfo->autoconf) 5622 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5623 5624 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5625 goto nla_put_failure; 5626 ci.preferred_time = ntohl(pinfo->prefered); 5627 ci.valid_time = ntohl(pinfo->valid); 5628 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5629 goto nla_put_failure; 5630 nlmsg_end(skb, nlh); 5631 return 0; 5632 5633 nla_put_failure: 5634 nlmsg_cancel(skb, nlh); 5635 return -EMSGSIZE; 5636 } 5637 5638 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5639 struct prefix_info *pinfo) 5640 { 5641 struct sk_buff *skb; 5642 struct net *net = dev_net(idev->dev); 5643 int err = -ENOBUFS; 5644 5645 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5646 if (!skb) 5647 goto errout; 5648 5649 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5650 if (err < 0) { 5651 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5652 WARN_ON(err == -EMSGSIZE); 5653 kfree_skb(skb); 5654 goto errout; 5655 } 5656 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5657 return; 5658 errout: 5659 if (err < 0) 5660 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5661 } 5662 5663 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5664 { 5665 struct net *net = dev_net(ifp->idev->dev); 5666 5667 if (event) 5668 ASSERT_RTNL(); 5669 5670 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5671 5672 switch (event) { 5673 case RTM_NEWADDR: 5674 /* 5675 * If the address was optimistic 5676 * we inserted the route at the start of 5677 * our DAD process, so we don't need 5678 * to do it again 5679 */ 5680 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5681 ip6_ins_rt(net, ifp->rt); 5682 if (ifp->idev->cnf.forwarding) 5683 addrconf_join_anycast(ifp); 5684 if (!ipv6_addr_any(&ifp->peer_addr)) 5685 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5686 ifp->idev->dev, 0, 0, 5687 GFP_ATOMIC); 5688 break; 5689 case RTM_DELADDR: 5690 if (ifp->idev->cnf.forwarding) 5691 addrconf_leave_anycast(ifp); 5692 addrconf_leave_solict(ifp->idev, &ifp->addr); 5693 if (!ipv6_addr_any(&ifp->peer_addr)) { 5694 struct fib6_info *rt; 5695 5696 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5697 ifp->idev->dev, 0, 0); 5698 if (rt) 5699 ip6_del_rt(net, rt); 5700 } 5701 if (ifp->rt) { 5702 ip6_del_rt(net, ifp->rt); 5703 ifp->rt = NULL; 5704 } 5705 rt_genid_bump_ipv6(net); 5706 break; 5707 } 5708 atomic_inc(&net->ipv6.dev_addr_genid); 5709 } 5710 5711 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5712 { 5713 rcu_read_lock_bh(); 5714 if (likely(ifp->idev->dead == 0)) 5715 __ipv6_ifa_notify(event, ifp); 5716 rcu_read_unlock_bh(); 5717 } 5718 5719 #ifdef CONFIG_SYSCTL 5720 5721 static 5722 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5723 void __user *buffer, size_t *lenp, loff_t *ppos) 5724 { 5725 int *valp = ctl->data; 5726 int val = *valp; 5727 loff_t pos = *ppos; 5728 struct ctl_table lctl; 5729 int ret; 5730 5731 /* 5732 * ctl->data points to idev->cnf.forwarding, we should 5733 * not modify it until we get the rtnl lock. 5734 */ 5735 lctl = *ctl; 5736 lctl.data = &val; 5737 5738 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5739 5740 if (write) 5741 ret = addrconf_fixup_forwarding(ctl, valp, val); 5742 if (ret) 5743 *ppos = pos; 5744 return ret; 5745 } 5746 5747 static 5748 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5749 void __user *buffer, size_t *lenp, loff_t *ppos) 5750 { 5751 struct inet6_dev *idev = ctl->extra1; 5752 int min_mtu = IPV6_MIN_MTU; 5753 struct ctl_table lctl; 5754 5755 lctl = *ctl; 5756 lctl.extra1 = &min_mtu; 5757 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5758 5759 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5760 } 5761 5762 static void dev_disable_change(struct inet6_dev *idev) 5763 { 5764 struct netdev_notifier_info info; 5765 5766 if (!idev || !idev->dev) 5767 return; 5768 5769 netdev_notifier_info_init(&info, idev->dev); 5770 if (idev->cnf.disable_ipv6) 5771 addrconf_notify(NULL, NETDEV_DOWN, &info); 5772 else 5773 addrconf_notify(NULL, NETDEV_UP, &info); 5774 } 5775 5776 static void addrconf_disable_change(struct net *net, __s32 newf) 5777 { 5778 struct net_device *dev; 5779 struct inet6_dev *idev; 5780 5781 for_each_netdev(net, dev) { 5782 idev = __in6_dev_get(dev); 5783 if (idev) { 5784 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5785 idev->cnf.disable_ipv6 = newf; 5786 if (changed) 5787 dev_disable_change(idev); 5788 } 5789 } 5790 } 5791 5792 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5793 { 5794 struct net *net; 5795 int old; 5796 5797 if (!rtnl_trylock()) 5798 return restart_syscall(); 5799 5800 net = (struct net *)table->extra2; 5801 old = *p; 5802 *p = newf; 5803 5804 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5805 rtnl_unlock(); 5806 return 0; 5807 } 5808 5809 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5810 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5811 addrconf_disable_change(net, newf); 5812 } else if ((!newf) ^ (!old)) 5813 dev_disable_change((struct inet6_dev *)table->extra1); 5814 5815 rtnl_unlock(); 5816 return 0; 5817 } 5818 5819 static 5820 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5821 void __user *buffer, size_t *lenp, loff_t *ppos) 5822 { 5823 int *valp = ctl->data; 5824 int val = *valp; 5825 loff_t pos = *ppos; 5826 struct ctl_table lctl; 5827 int ret; 5828 5829 /* 5830 * ctl->data points to idev->cnf.disable_ipv6, we should 5831 * not modify it until we get the rtnl lock. 5832 */ 5833 lctl = *ctl; 5834 lctl.data = &val; 5835 5836 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5837 5838 if (write) 5839 ret = addrconf_disable_ipv6(ctl, valp, val); 5840 if (ret) 5841 *ppos = pos; 5842 return ret; 5843 } 5844 5845 static 5846 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5847 void __user *buffer, size_t *lenp, loff_t *ppos) 5848 { 5849 int *valp = ctl->data; 5850 int ret; 5851 int old, new; 5852 5853 old = *valp; 5854 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5855 new = *valp; 5856 5857 if (write && old != new) { 5858 struct net *net = ctl->extra2; 5859 5860 if (!rtnl_trylock()) 5861 return restart_syscall(); 5862 5863 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5864 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5865 NETCONFA_PROXY_NEIGH, 5866 NETCONFA_IFINDEX_DEFAULT, 5867 net->ipv6.devconf_dflt); 5868 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5870 NETCONFA_PROXY_NEIGH, 5871 NETCONFA_IFINDEX_ALL, 5872 net->ipv6.devconf_all); 5873 else { 5874 struct inet6_dev *idev = ctl->extra1; 5875 5876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5877 NETCONFA_PROXY_NEIGH, 5878 idev->dev->ifindex, 5879 &idev->cnf); 5880 } 5881 rtnl_unlock(); 5882 } 5883 5884 return ret; 5885 } 5886 5887 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5888 void __user *buffer, size_t *lenp, 5889 loff_t *ppos) 5890 { 5891 int ret = 0; 5892 int new_val; 5893 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5894 struct net *net = (struct net *)ctl->extra2; 5895 5896 if (!rtnl_trylock()) 5897 return restart_syscall(); 5898 5899 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5900 5901 if (write) { 5902 new_val = *((int *)ctl->data); 5903 5904 if (check_addr_gen_mode(new_val) < 0) { 5905 ret = -EINVAL; 5906 goto out; 5907 } 5908 5909 /* request for default */ 5910 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5911 ipv6_devconf_dflt.addr_gen_mode = new_val; 5912 5913 /* request for individual net device */ 5914 } else { 5915 if (!idev) 5916 goto out; 5917 5918 if (check_stable_privacy(idev, net, new_val) < 0) { 5919 ret = -EINVAL; 5920 goto out; 5921 } 5922 5923 if (idev->cnf.addr_gen_mode != new_val) { 5924 idev->cnf.addr_gen_mode = new_val; 5925 addrconf_dev_config(idev->dev); 5926 } 5927 } 5928 } 5929 5930 out: 5931 rtnl_unlock(); 5932 5933 return ret; 5934 } 5935 5936 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5937 void __user *buffer, size_t *lenp, 5938 loff_t *ppos) 5939 { 5940 int err; 5941 struct in6_addr addr; 5942 char str[IPV6_MAX_STRLEN]; 5943 struct ctl_table lctl = *ctl; 5944 struct net *net = ctl->extra2; 5945 struct ipv6_stable_secret *secret = ctl->data; 5946 5947 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5948 return -EIO; 5949 5950 lctl.maxlen = IPV6_MAX_STRLEN; 5951 lctl.data = str; 5952 5953 if (!rtnl_trylock()) 5954 return restart_syscall(); 5955 5956 if (!write && !secret->initialized) { 5957 err = -EIO; 5958 goto out; 5959 } 5960 5961 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5962 if (err >= sizeof(str)) { 5963 err = -EIO; 5964 goto out; 5965 } 5966 5967 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5968 if (err || !write) 5969 goto out; 5970 5971 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5972 err = -EIO; 5973 goto out; 5974 } 5975 5976 secret->initialized = true; 5977 secret->secret = addr; 5978 5979 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5980 struct net_device *dev; 5981 5982 for_each_netdev(net, dev) { 5983 struct inet6_dev *idev = __in6_dev_get(dev); 5984 5985 if (idev) { 5986 idev->cnf.addr_gen_mode = 5987 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5988 } 5989 } 5990 } else { 5991 struct inet6_dev *idev = ctl->extra1; 5992 5993 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5994 } 5995 5996 out: 5997 rtnl_unlock(); 5998 5999 return err; 6000 } 6001 6002 static 6003 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6004 int write, 6005 void __user *buffer, 6006 size_t *lenp, 6007 loff_t *ppos) 6008 { 6009 int *valp = ctl->data; 6010 int val = *valp; 6011 loff_t pos = *ppos; 6012 struct ctl_table lctl; 6013 int ret; 6014 6015 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6016 * we should not modify it until we get the rtnl lock. 6017 */ 6018 lctl = *ctl; 6019 lctl.data = &val; 6020 6021 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6022 6023 if (write) 6024 ret = addrconf_fixup_linkdown(ctl, valp, val); 6025 if (ret) 6026 *ppos = pos; 6027 return ret; 6028 } 6029 6030 static 6031 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6032 { 6033 if (rt) { 6034 if (action) 6035 rt->dst.flags |= DST_NOPOLICY; 6036 else 6037 rt->dst.flags &= ~DST_NOPOLICY; 6038 } 6039 } 6040 6041 static 6042 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6043 { 6044 struct inet6_ifaddr *ifa; 6045 6046 read_lock_bh(&idev->lock); 6047 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6048 spin_lock(&ifa->lock); 6049 if (ifa->rt) { 6050 struct fib6_info *rt = ifa->rt; 6051 int cpu; 6052 6053 rcu_read_lock(); 6054 ifa->rt->dst_nopolicy = val ? true : false; 6055 if (rt->rt6i_pcpu) { 6056 for_each_possible_cpu(cpu) { 6057 struct rt6_info **rtp; 6058 6059 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6060 addrconf_set_nopolicy(*rtp, val); 6061 } 6062 } 6063 rcu_read_unlock(); 6064 } 6065 spin_unlock(&ifa->lock); 6066 } 6067 read_unlock_bh(&idev->lock); 6068 } 6069 6070 static 6071 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6072 { 6073 struct inet6_dev *idev; 6074 struct net *net; 6075 6076 if (!rtnl_trylock()) 6077 return restart_syscall(); 6078 6079 *valp = val; 6080 6081 net = (struct net *)ctl->extra2; 6082 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6083 rtnl_unlock(); 6084 return 0; 6085 } 6086 6087 if (valp == &net->ipv6.devconf_all->disable_policy) { 6088 struct net_device *dev; 6089 6090 for_each_netdev(net, dev) { 6091 idev = __in6_dev_get(dev); 6092 if (idev) 6093 addrconf_disable_policy_idev(idev, val); 6094 } 6095 } else { 6096 idev = (struct inet6_dev *)ctl->extra1; 6097 addrconf_disable_policy_idev(idev, val); 6098 } 6099 6100 rtnl_unlock(); 6101 return 0; 6102 } 6103 6104 static 6105 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6106 void __user *buffer, size_t *lenp, 6107 loff_t *ppos) 6108 { 6109 int *valp = ctl->data; 6110 int val = *valp; 6111 loff_t pos = *ppos; 6112 struct ctl_table lctl; 6113 int ret; 6114 6115 lctl = *ctl; 6116 lctl.data = &val; 6117 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6118 6119 if (write && (*valp != val)) 6120 ret = addrconf_disable_policy(ctl, valp, val); 6121 6122 if (ret) 6123 *ppos = pos; 6124 6125 return ret; 6126 } 6127 6128 static int minus_one = -1; 6129 static const int zero = 0; 6130 static const int one = 1; 6131 static const int two_five_five = 255; 6132 6133 static const struct ctl_table addrconf_sysctl[] = { 6134 { 6135 .procname = "forwarding", 6136 .data = &ipv6_devconf.forwarding, 6137 .maxlen = sizeof(int), 6138 .mode = 0644, 6139 .proc_handler = addrconf_sysctl_forward, 6140 }, 6141 { 6142 .procname = "hop_limit", 6143 .data = &ipv6_devconf.hop_limit, 6144 .maxlen = sizeof(int), 6145 .mode = 0644, 6146 .proc_handler = proc_dointvec_minmax, 6147 .extra1 = (void *)&one, 6148 .extra2 = (void *)&two_five_five, 6149 }, 6150 { 6151 .procname = "mtu", 6152 .data = &ipv6_devconf.mtu6, 6153 .maxlen = sizeof(int), 6154 .mode = 0644, 6155 .proc_handler = addrconf_sysctl_mtu, 6156 }, 6157 { 6158 .procname = "accept_ra", 6159 .data = &ipv6_devconf.accept_ra, 6160 .maxlen = sizeof(int), 6161 .mode = 0644, 6162 .proc_handler = proc_dointvec, 6163 }, 6164 { 6165 .procname = "accept_redirects", 6166 .data = &ipv6_devconf.accept_redirects, 6167 .maxlen = sizeof(int), 6168 .mode = 0644, 6169 .proc_handler = proc_dointvec, 6170 }, 6171 { 6172 .procname = "autoconf", 6173 .data = &ipv6_devconf.autoconf, 6174 .maxlen = sizeof(int), 6175 .mode = 0644, 6176 .proc_handler = proc_dointvec, 6177 }, 6178 { 6179 .procname = "dad_transmits", 6180 .data = &ipv6_devconf.dad_transmits, 6181 .maxlen = sizeof(int), 6182 .mode = 0644, 6183 .proc_handler = proc_dointvec, 6184 }, 6185 { 6186 .procname = "router_solicitations", 6187 .data = &ipv6_devconf.rtr_solicits, 6188 .maxlen = sizeof(int), 6189 .mode = 0644, 6190 .proc_handler = proc_dointvec_minmax, 6191 .extra1 = &minus_one, 6192 }, 6193 { 6194 .procname = "router_solicitation_interval", 6195 .data = &ipv6_devconf.rtr_solicit_interval, 6196 .maxlen = sizeof(int), 6197 .mode = 0644, 6198 .proc_handler = proc_dointvec_jiffies, 6199 }, 6200 { 6201 .procname = "router_solicitation_max_interval", 6202 .data = &ipv6_devconf.rtr_solicit_max_interval, 6203 .maxlen = sizeof(int), 6204 .mode = 0644, 6205 .proc_handler = proc_dointvec_jiffies, 6206 }, 6207 { 6208 .procname = "router_solicitation_delay", 6209 .data = &ipv6_devconf.rtr_solicit_delay, 6210 .maxlen = sizeof(int), 6211 .mode = 0644, 6212 .proc_handler = proc_dointvec_jiffies, 6213 }, 6214 { 6215 .procname = "force_mld_version", 6216 .data = &ipv6_devconf.force_mld_version, 6217 .maxlen = sizeof(int), 6218 .mode = 0644, 6219 .proc_handler = proc_dointvec, 6220 }, 6221 { 6222 .procname = "mldv1_unsolicited_report_interval", 6223 .data = 6224 &ipv6_devconf.mldv1_unsolicited_report_interval, 6225 .maxlen = sizeof(int), 6226 .mode = 0644, 6227 .proc_handler = proc_dointvec_ms_jiffies, 6228 }, 6229 { 6230 .procname = "mldv2_unsolicited_report_interval", 6231 .data = 6232 &ipv6_devconf.mldv2_unsolicited_report_interval, 6233 .maxlen = sizeof(int), 6234 .mode = 0644, 6235 .proc_handler = proc_dointvec_ms_jiffies, 6236 }, 6237 { 6238 .procname = "use_tempaddr", 6239 .data = &ipv6_devconf.use_tempaddr, 6240 .maxlen = sizeof(int), 6241 .mode = 0644, 6242 .proc_handler = proc_dointvec, 6243 }, 6244 { 6245 .procname = "temp_valid_lft", 6246 .data = &ipv6_devconf.temp_valid_lft, 6247 .maxlen = sizeof(int), 6248 .mode = 0644, 6249 .proc_handler = proc_dointvec, 6250 }, 6251 { 6252 .procname = "temp_prefered_lft", 6253 .data = &ipv6_devconf.temp_prefered_lft, 6254 .maxlen = sizeof(int), 6255 .mode = 0644, 6256 .proc_handler = proc_dointvec, 6257 }, 6258 { 6259 .procname = "regen_max_retry", 6260 .data = &ipv6_devconf.regen_max_retry, 6261 .maxlen = sizeof(int), 6262 .mode = 0644, 6263 .proc_handler = proc_dointvec, 6264 }, 6265 { 6266 .procname = "max_desync_factor", 6267 .data = &ipv6_devconf.max_desync_factor, 6268 .maxlen = sizeof(int), 6269 .mode = 0644, 6270 .proc_handler = proc_dointvec, 6271 }, 6272 { 6273 .procname = "max_addresses", 6274 .data = &ipv6_devconf.max_addresses, 6275 .maxlen = sizeof(int), 6276 .mode = 0644, 6277 .proc_handler = proc_dointvec, 6278 }, 6279 { 6280 .procname = "accept_ra_defrtr", 6281 .data = &ipv6_devconf.accept_ra_defrtr, 6282 .maxlen = sizeof(int), 6283 .mode = 0644, 6284 .proc_handler = proc_dointvec, 6285 }, 6286 { 6287 .procname = "accept_ra_min_hop_limit", 6288 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6289 .maxlen = sizeof(int), 6290 .mode = 0644, 6291 .proc_handler = proc_dointvec, 6292 }, 6293 { 6294 .procname = "accept_ra_pinfo", 6295 .data = &ipv6_devconf.accept_ra_pinfo, 6296 .maxlen = sizeof(int), 6297 .mode = 0644, 6298 .proc_handler = proc_dointvec, 6299 }, 6300 #ifdef CONFIG_IPV6_ROUTER_PREF 6301 { 6302 .procname = "accept_ra_rtr_pref", 6303 .data = &ipv6_devconf.accept_ra_rtr_pref, 6304 .maxlen = sizeof(int), 6305 .mode = 0644, 6306 .proc_handler = proc_dointvec, 6307 }, 6308 { 6309 .procname = "router_probe_interval", 6310 .data = &ipv6_devconf.rtr_probe_interval, 6311 .maxlen = sizeof(int), 6312 .mode = 0644, 6313 .proc_handler = proc_dointvec_jiffies, 6314 }, 6315 #ifdef CONFIG_IPV6_ROUTE_INFO 6316 { 6317 .procname = "accept_ra_rt_info_min_plen", 6318 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6319 .maxlen = sizeof(int), 6320 .mode = 0644, 6321 .proc_handler = proc_dointvec, 6322 }, 6323 { 6324 .procname = "accept_ra_rt_info_max_plen", 6325 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6326 .maxlen = sizeof(int), 6327 .mode = 0644, 6328 .proc_handler = proc_dointvec, 6329 }, 6330 #endif 6331 #endif 6332 { 6333 .procname = "proxy_ndp", 6334 .data = &ipv6_devconf.proxy_ndp, 6335 .maxlen = sizeof(int), 6336 .mode = 0644, 6337 .proc_handler = addrconf_sysctl_proxy_ndp, 6338 }, 6339 { 6340 .procname = "accept_source_route", 6341 .data = &ipv6_devconf.accept_source_route, 6342 .maxlen = sizeof(int), 6343 .mode = 0644, 6344 .proc_handler = proc_dointvec, 6345 }, 6346 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6347 { 6348 .procname = "optimistic_dad", 6349 .data = &ipv6_devconf.optimistic_dad, 6350 .maxlen = sizeof(int), 6351 .mode = 0644, 6352 .proc_handler = proc_dointvec, 6353 }, 6354 { 6355 .procname = "use_optimistic", 6356 .data = &ipv6_devconf.use_optimistic, 6357 .maxlen = sizeof(int), 6358 .mode = 0644, 6359 .proc_handler = proc_dointvec, 6360 }, 6361 #endif 6362 #ifdef CONFIG_IPV6_MROUTE 6363 { 6364 .procname = "mc_forwarding", 6365 .data = &ipv6_devconf.mc_forwarding, 6366 .maxlen = sizeof(int), 6367 .mode = 0444, 6368 .proc_handler = proc_dointvec, 6369 }, 6370 #endif 6371 { 6372 .procname = "disable_ipv6", 6373 .data = &ipv6_devconf.disable_ipv6, 6374 .maxlen = sizeof(int), 6375 .mode = 0644, 6376 .proc_handler = addrconf_sysctl_disable, 6377 }, 6378 { 6379 .procname = "accept_dad", 6380 .data = &ipv6_devconf.accept_dad, 6381 .maxlen = sizeof(int), 6382 .mode = 0644, 6383 .proc_handler = proc_dointvec, 6384 }, 6385 { 6386 .procname = "force_tllao", 6387 .data = &ipv6_devconf.force_tllao, 6388 .maxlen = sizeof(int), 6389 .mode = 0644, 6390 .proc_handler = proc_dointvec 6391 }, 6392 { 6393 .procname = "ndisc_notify", 6394 .data = &ipv6_devconf.ndisc_notify, 6395 .maxlen = sizeof(int), 6396 .mode = 0644, 6397 .proc_handler = proc_dointvec 6398 }, 6399 { 6400 .procname = "suppress_frag_ndisc", 6401 .data = &ipv6_devconf.suppress_frag_ndisc, 6402 .maxlen = sizeof(int), 6403 .mode = 0644, 6404 .proc_handler = proc_dointvec 6405 }, 6406 { 6407 .procname = "accept_ra_from_local", 6408 .data = &ipv6_devconf.accept_ra_from_local, 6409 .maxlen = sizeof(int), 6410 .mode = 0644, 6411 .proc_handler = proc_dointvec, 6412 }, 6413 { 6414 .procname = "accept_ra_mtu", 6415 .data = &ipv6_devconf.accept_ra_mtu, 6416 .maxlen = sizeof(int), 6417 .mode = 0644, 6418 .proc_handler = proc_dointvec, 6419 }, 6420 { 6421 .procname = "stable_secret", 6422 .data = &ipv6_devconf.stable_secret, 6423 .maxlen = IPV6_MAX_STRLEN, 6424 .mode = 0600, 6425 .proc_handler = addrconf_sysctl_stable_secret, 6426 }, 6427 { 6428 .procname = "use_oif_addrs_only", 6429 .data = &ipv6_devconf.use_oif_addrs_only, 6430 .maxlen = sizeof(int), 6431 .mode = 0644, 6432 .proc_handler = proc_dointvec, 6433 }, 6434 { 6435 .procname = "ignore_routes_with_linkdown", 6436 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6437 .maxlen = sizeof(int), 6438 .mode = 0644, 6439 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6440 }, 6441 { 6442 .procname = "drop_unicast_in_l2_multicast", 6443 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6444 .maxlen = sizeof(int), 6445 .mode = 0644, 6446 .proc_handler = proc_dointvec, 6447 }, 6448 { 6449 .procname = "drop_unsolicited_na", 6450 .data = &ipv6_devconf.drop_unsolicited_na, 6451 .maxlen = sizeof(int), 6452 .mode = 0644, 6453 .proc_handler = proc_dointvec, 6454 }, 6455 { 6456 .procname = "keep_addr_on_down", 6457 .data = &ipv6_devconf.keep_addr_on_down, 6458 .maxlen = sizeof(int), 6459 .mode = 0644, 6460 .proc_handler = proc_dointvec, 6461 6462 }, 6463 { 6464 .procname = "seg6_enabled", 6465 .data = &ipv6_devconf.seg6_enabled, 6466 .maxlen = sizeof(int), 6467 .mode = 0644, 6468 .proc_handler = proc_dointvec, 6469 }, 6470 #ifdef CONFIG_IPV6_SEG6_HMAC 6471 { 6472 .procname = "seg6_require_hmac", 6473 .data = &ipv6_devconf.seg6_require_hmac, 6474 .maxlen = sizeof(int), 6475 .mode = 0644, 6476 .proc_handler = proc_dointvec, 6477 }, 6478 #endif 6479 { 6480 .procname = "enhanced_dad", 6481 .data = &ipv6_devconf.enhanced_dad, 6482 .maxlen = sizeof(int), 6483 .mode = 0644, 6484 .proc_handler = proc_dointvec, 6485 }, 6486 { 6487 .procname = "addr_gen_mode", 6488 .data = &ipv6_devconf.addr_gen_mode, 6489 .maxlen = sizeof(int), 6490 .mode = 0644, 6491 .proc_handler = addrconf_sysctl_addr_gen_mode, 6492 }, 6493 { 6494 .procname = "disable_policy", 6495 .data = &ipv6_devconf.disable_policy, 6496 .maxlen = sizeof(int), 6497 .mode = 0644, 6498 .proc_handler = addrconf_sysctl_disable_policy, 6499 }, 6500 { 6501 .procname = "ndisc_tclass", 6502 .data = &ipv6_devconf.ndisc_tclass, 6503 .maxlen = sizeof(int), 6504 .mode = 0644, 6505 .proc_handler = proc_dointvec_minmax, 6506 .extra1 = (void *)&zero, 6507 .extra2 = (void *)&two_five_five, 6508 }, 6509 { 6510 /* sentinel */ 6511 } 6512 }; 6513 6514 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6515 struct inet6_dev *idev, struct ipv6_devconf *p) 6516 { 6517 int i, ifindex; 6518 struct ctl_table *table; 6519 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6520 6521 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6522 if (!table) 6523 goto out; 6524 6525 for (i = 0; table[i].data; i++) { 6526 table[i].data += (char *)p - (char *)&ipv6_devconf; 6527 /* If one of these is already set, then it is not safe to 6528 * overwrite either of them: this makes proc_dointvec_minmax 6529 * usable. 6530 */ 6531 if (!table[i].extra1 && !table[i].extra2) { 6532 table[i].extra1 = idev; /* embedded; no ref */ 6533 table[i].extra2 = net; 6534 } 6535 } 6536 6537 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6538 6539 p->sysctl_header = register_net_sysctl(net, path, table); 6540 if (!p->sysctl_header) 6541 goto free; 6542 6543 if (!strcmp(dev_name, "all")) 6544 ifindex = NETCONFA_IFINDEX_ALL; 6545 else if (!strcmp(dev_name, "default")) 6546 ifindex = NETCONFA_IFINDEX_DEFAULT; 6547 else 6548 ifindex = idev->dev->ifindex; 6549 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6550 ifindex, p); 6551 return 0; 6552 6553 free: 6554 kfree(table); 6555 out: 6556 return -ENOBUFS; 6557 } 6558 6559 static void __addrconf_sysctl_unregister(struct net *net, 6560 struct ipv6_devconf *p, int ifindex) 6561 { 6562 struct ctl_table *table; 6563 6564 if (!p->sysctl_header) 6565 return; 6566 6567 table = p->sysctl_header->ctl_table_arg; 6568 unregister_net_sysctl_table(p->sysctl_header); 6569 p->sysctl_header = NULL; 6570 kfree(table); 6571 6572 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6573 } 6574 6575 static int addrconf_sysctl_register(struct inet6_dev *idev) 6576 { 6577 int err; 6578 6579 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6580 return -EINVAL; 6581 6582 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6583 &ndisc_ifinfo_sysctl_change); 6584 if (err) 6585 return err; 6586 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6587 idev, &idev->cnf); 6588 if (err) 6589 neigh_sysctl_unregister(idev->nd_parms); 6590 6591 return err; 6592 } 6593 6594 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6595 { 6596 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6597 idev->dev->ifindex); 6598 neigh_sysctl_unregister(idev->nd_parms); 6599 } 6600 6601 6602 #endif 6603 6604 static int __net_init addrconf_init_net(struct net *net) 6605 { 6606 int err = -ENOMEM; 6607 struct ipv6_devconf *all, *dflt; 6608 6609 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6610 if (!all) 6611 goto err_alloc_all; 6612 6613 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6614 if (!dflt) 6615 goto err_alloc_dflt; 6616 6617 /* these will be inherited by all namespaces */ 6618 dflt->autoconf = ipv6_defaults.autoconf; 6619 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6620 6621 dflt->stable_secret.initialized = false; 6622 all->stable_secret.initialized = false; 6623 6624 net->ipv6.devconf_all = all; 6625 net->ipv6.devconf_dflt = dflt; 6626 6627 #ifdef CONFIG_SYSCTL 6628 err = __addrconf_sysctl_register(net, "all", NULL, all); 6629 if (err < 0) 6630 goto err_reg_all; 6631 6632 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6633 if (err < 0) 6634 goto err_reg_dflt; 6635 #endif 6636 return 0; 6637 6638 #ifdef CONFIG_SYSCTL 6639 err_reg_dflt: 6640 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6641 err_reg_all: 6642 kfree(dflt); 6643 #endif 6644 err_alloc_dflt: 6645 kfree(all); 6646 err_alloc_all: 6647 return err; 6648 } 6649 6650 static void __net_exit addrconf_exit_net(struct net *net) 6651 { 6652 #ifdef CONFIG_SYSCTL 6653 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6654 NETCONFA_IFINDEX_DEFAULT); 6655 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6656 NETCONFA_IFINDEX_ALL); 6657 #endif 6658 kfree(net->ipv6.devconf_dflt); 6659 kfree(net->ipv6.devconf_all); 6660 } 6661 6662 static struct pernet_operations addrconf_ops = { 6663 .init = addrconf_init_net, 6664 .exit = addrconf_exit_net, 6665 }; 6666 6667 static struct rtnl_af_ops inet6_ops __read_mostly = { 6668 .family = AF_INET6, 6669 .fill_link_af = inet6_fill_link_af, 6670 .get_link_af_size = inet6_get_link_af_size, 6671 .validate_link_af = inet6_validate_link_af, 6672 .set_link_af = inet6_set_link_af, 6673 }; 6674 6675 /* 6676 * Init / cleanup code 6677 */ 6678 6679 int __init addrconf_init(void) 6680 { 6681 struct inet6_dev *idev; 6682 int i, err; 6683 6684 err = ipv6_addr_label_init(); 6685 if (err < 0) { 6686 pr_crit("%s: cannot initialize default policy table: %d\n", 6687 __func__, err); 6688 goto out; 6689 } 6690 6691 err = register_pernet_subsys(&addrconf_ops); 6692 if (err < 0) 6693 goto out_addrlabel; 6694 6695 addrconf_wq = create_workqueue("ipv6_addrconf"); 6696 if (!addrconf_wq) { 6697 err = -ENOMEM; 6698 goto out_nowq; 6699 } 6700 6701 /* The addrconf netdev notifier requires that loopback_dev 6702 * has it's ipv6 private information allocated and setup 6703 * before it can bring up and give link-local addresses 6704 * to other devices which are up. 6705 * 6706 * Unfortunately, loopback_dev is not necessarily the first 6707 * entry in the global dev_base list of net devices. In fact, 6708 * it is likely to be the very last entry on that list. 6709 * So this causes the notifier registry below to try and 6710 * give link-local addresses to all devices besides loopback_dev 6711 * first, then loopback_dev, which cases all the non-loopback_dev 6712 * devices to fail to get a link-local address. 6713 * 6714 * So, as a temporary fix, allocate the ipv6 structure for 6715 * loopback_dev first by hand. 6716 * Longer term, all of the dependencies ipv6 has upon the loopback 6717 * device and it being up should be removed. 6718 */ 6719 rtnl_lock(); 6720 idev = ipv6_add_dev(init_net.loopback_dev); 6721 rtnl_unlock(); 6722 if (IS_ERR(idev)) { 6723 err = PTR_ERR(idev); 6724 goto errlo; 6725 } 6726 6727 ip6_route_init_special_entries(); 6728 6729 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6730 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6731 6732 register_netdevice_notifier(&ipv6_dev_notf); 6733 6734 addrconf_verify(); 6735 6736 rtnl_af_register(&inet6_ops); 6737 6738 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6739 NULL, inet6_dump_ifinfo, 0); 6740 if (err < 0) 6741 goto errout; 6742 6743 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6744 inet6_rtm_newaddr, NULL, 0); 6745 if (err < 0) 6746 goto errout; 6747 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6748 inet6_rtm_deladdr, NULL, 0); 6749 if (err < 0) 6750 goto errout; 6751 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6752 inet6_rtm_getaddr, inet6_dump_ifaddr, 6753 RTNL_FLAG_DOIT_UNLOCKED); 6754 if (err < 0) 6755 goto errout; 6756 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6757 NULL, inet6_dump_ifmcaddr, 0); 6758 if (err < 0) 6759 goto errout; 6760 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6761 NULL, inet6_dump_ifacaddr, 0); 6762 if (err < 0) 6763 goto errout; 6764 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6765 inet6_netconf_get_devconf, 6766 inet6_netconf_dump_devconf, 6767 RTNL_FLAG_DOIT_UNLOCKED); 6768 if (err < 0) 6769 goto errout; 6770 err = ipv6_addr_label_rtnl_register(); 6771 if (err < 0) 6772 goto errout; 6773 6774 return 0; 6775 errout: 6776 rtnl_unregister_all(PF_INET6); 6777 rtnl_af_unregister(&inet6_ops); 6778 unregister_netdevice_notifier(&ipv6_dev_notf); 6779 errlo: 6780 destroy_workqueue(addrconf_wq); 6781 out_nowq: 6782 unregister_pernet_subsys(&addrconf_ops); 6783 out_addrlabel: 6784 ipv6_addr_label_cleanup(); 6785 out: 6786 return err; 6787 } 6788 6789 void addrconf_cleanup(void) 6790 { 6791 struct net_device *dev; 6792 int i; 6793 6794 unregister_netdevice_notifier(&ipv6_dev_notf); 6795 unregister_pernet_subsys(&addrconf_ops); 6796 ipv6_addr_label_cleanup(); 6797 6798 rtnl_af_unregister(&inet6_ops); 6799 6800 rtnl_lock(); 6801 6802 /* clean dev list */ 6803 for_each_netdev(&init_net, dev) { 6804 if (__in6_dev_get(dev) == NULL) 6805 continue; 6806 addrconf_ifdown(dev, 1); 6807 } 6808 addrconf_ifdown(init_net.loopback_dev, 2); 6809 6810 /* 6811 * Check hash table. 6812 */ 6813 spin_lock_bh(&addrconf_hash_lock); 6814 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6815 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6816 spin_unlock_bh(&addrconf_hash_lock); 6817 cancel_delayed_work(&addr_chk_work); 6818 rtnl_unlock(); 6819 6820 destroy_workqueue(addrconf_wq); 6821 } 6822