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 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(const struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 #define IN6_ADDR_HSIZE_SHIFT 8 161 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 162 /* 163 * Configured unicast address hash table 164 */ 165 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 166 static DEFINE_SPINLOCK(addrconf_hash_lock); 167 168 static void addrconf_verify(void); 169 static void addrconf_verify_rtnl(void); 170 static void addrconf_verify_work(struct work_struct *); 171 172 static struct workqueue_struct *addrconf_wq; 173 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 174 175 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 176 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 177 178 static void addrconf_type_change(struct net_device *dev, 179 unsigned long event); 180 static int addrconf_ifdown(struct net_device *dev, int how); 181 182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 183 int plen, 184 const struct net_device *dev, 185 u32 flags, u32 noflags); 186 187 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 188 static void addrconf_dad_work(struct work_struct *w); 189 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 190 static void addrconf_dad_run(struct inet6_dev *idev); 191 static void addrconf_rs_timer(unsigned long data); 192 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 193 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 194 195 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 196 struct prefix_info *pinfo); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_min_plen = 0, 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 .accept_ra_mtu = 1, 237 .stable_secret = { 238 .initialized = false, 239 }, 240 .use_oif_addrs_only = 0, 241 .ignore_routes_with_linkdown = 0, 242 .keep_addr_on_down = 0, 243 .seg6_enabled = 0, 244 #ifdef CONFIG_IPV6_SEG6_HMAC 245 .seg6_require_hmac = 0, 246 #endif 247 .enhanced_dad = 1, 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 249 .disable_policy = 0, 250 }; 251 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 253 .forwarding = 0, 254 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 255 .mtu6 = IPV6_MIN_MTU, 256 .accept_ra = 1, 257 .accept_redirects = 1, 258 .autoconf = 1, 259 .force_mld_version = 0, 260 .mldv1_unsolicited_report_interval = 10 * HZ, 261 .mldv2_unsolicited_report_interval = HZ, 262 .dad_transmits = 1, 263 .rtr_solicits = MAX_RTR_SOLICITATIONS, 264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 267 .use_tempaddr = 0, 268 .temp_valid_lft = TEMP_VALID_LIFETIME, 269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 270 .regen_max_retry = REGEN_MAX_RETRY, 271 .max_desync_factor = MAX_DESYNC_FACTOR, 272 .max_addresses = IPV6_MAX_ADDRESSES, 273 .accept_ra_defrtr = 1, 274 .accept_ra_from_local = 0, 275 .accept_ra_min_hop_limit= 1, 276 .accept_ra_pinfo = 1, 277 #ifdef CONFIG_IPV6_ROUTER_PREF 278 .accept_ra_rtr_pref = 1, 279 .rtr_probe_interval = 60 * HZ, 280 #ifdef CONFIG_IPV6_ROUTE_INFO 281 .accept_ra_rt_info_min_plen = 0, 282 .accept_ra_rt_info_max_plen = 0, 283 #endif 284 #endif 285 .proxy_ndp = 0, 286 .accept_source_route = 0, /* we do not accept RH0 by default. */ 287 .disable_ipv6 = 0, 288 .accept_dad = 1, 289 .suppress_frag_ndisc = 1, 290 .accept_ra_mtu = 1, 291 .stable_secret = { 292 .initialized = false, 293 }, 294 .use_oif_addrs_only = 0, 295 .ignore_routes_with_linkdown = 0, 296 .keep_addr_on_down = 0, 297 .seg6_enabled = 0, 298 #ifdef CONFIG_IPV6_SEG6_HMAC 299 .seg6_require_hmac = 0, 300 #endif 301 .enhanced_dad = 1, 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 303 .disable_policy = 0, 304 }; 305 306 /* Check if link is ready: is it up and is a valid qdisc available */ 307 static inline bool addrconf_link_ready(const struct net_device *dev) 308 { 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!timer_pending(&idev->rs_timer)) 328 in6_dev_hold(idev); 329 mod_timer(&idev->rs_timer, jiffies + when); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 392 (unsigned long)ndev); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 else 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 399 400 ndev->cnf.mtu6 = dev->mtu; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 dev_hold(dev); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 ADBG(KERN_WARNING 413 "%s: cannot allocate memory for statistics; dev=%s.\n", 414 __func__, dev->name); 415 neigh_parms_release(&nd_tbl, ndev->nd_parms); 416 dev_put(dev); 417 kfree(ndev); 418 return ERR_PTR(err); 419 } 420 421 if (snmp6_register_dev(ndev) < 0) { 422 ADBG(KERN_WARNING 423 "%s: cannot create /proc/net/dev_snmp6/%s\n", 424 __func__, dev->name); 425 goto err_release; 426 } 427 428 /* One reference from device. */ 429 refcount_set(&ndev->refcnt, 1); 430 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 432 ndev->cnf.accept_dad = -1; 433 434 #if IS_ENABLED(CONFIG_IPV6_SIT) 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 436 pr_info("%s: Disabled Multicast RS\n", dev->name); 437 ndev->cnf.rtr_solicits = 0; 438 } 439 #endif 440 441 INIT_LIST_HEAD(&ndev->tempaddr_list); 442 ndev->desync_factor = U32_MAX; 443 if ((dev->flags&IFF_LOOPBACK) || 444 dev->type == ARPHRD_TUNNEL || 445 dev->type == ARPHRD_TUNNEL6 || 446 dev->type == ARPHRD_SIT || 447 dev->type == ARPHRD_NONE) { 448 ndev->cnf.use_tempaddr = -1; 449 } else 450 ipv6_regen_rndid(ndev); 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_link_ready(dev)) 455 ndev->if_flags |= IF_READY; 456 457 ipv6_mc_init_dev(ndev); 458 ndev->tstamp = jiffies; 459 err = addrconf_sysctl_register(ndev); 460 if (err) { 461 ipv6_mc_destroy_dev(ndev); 462 snmp6_unregister_dev(ndev); 463 goto err_release; 464 } 465 /* protected by rtnl_lock */ 466 rcu_assign_pointer(dev->ip6_ptr, ndev); 467 468 /* Join interface-local all-node multicast group */ 469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 470 471 /* Join all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 473 474 /* Join all-router multicast group if forwarding is set */ 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 478 return ndev; 479 480 err_release: 481 neigh_parms_release(&nd_tbl, ndev->nd_parms); 482 ndev->dead = 1; 483 in6_dev_finish_destroy(ndev); 484 return ERR_PTR(err); 485 } 486 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 488 { 489 struct inet6_dev *idev; 490 491 ASSERT_RTNL(); 492 493 idev = __in6_dev_get(dev); 494 if (!idev) { 495 idev = ipv6_add_dev(dev); 496 if (IS_ERR(idev)) 497 return NULL; 498 } 499 500 if (dev->flags&IFF_UP) 501 ipv6_mc_up(idev); 502 return idev; 503 } 504 505 static int inet6_netconf_msgsize_devconf(int type) 506 { 507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 508 + nla_total_size(4); /* NETCONFA_IFINDEX */ 509 bool all = false; 510 511 if (type == NETCONFA_ALL) 512 all = true; 513 514 if (all || type == NETCONFA_FORWARDING) 515 size += nla_total_size(4); 516 #ifdef CONFIG_IPV6_MROUTE 517 if (all || type == NETCONFA_MC_FORWARDING) 518 size += nla_total_size(4); 519 #endif 520 if (all || type == NETCONFA_PROXY_NEIGH) 521 size += nla_total_size(4); 522 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 524 size += nla_total_size(4); 525 526 return size; 527 } 528 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 530 struct ipv6_devconf *devconf, u32 portid, 531 u32 seq, int event, unsigned int flags, 532 int type) 533 { 534 struct nlmsghdr *nlh; 535 struct netconfmsg *ncm; 536 bool all = false; 537 538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 539 flags); 540 if (!nlh) 541 return -EMSGSIZE; 542 543 if (type == NETCONFA_ALL) 544 all = true; 545 546 ncm = nlmsg_data(nlh); 547 ncm->ncm_family = AF_INET6; 548 549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 550 goto nla_put_failure; 551 552 if (!devconf) 553 goto out; 554 555 if ((all || type == NETCONFA_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 557 goto nla_put_failure; 558 #ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 devconf->mc_forwarding) < 0) 562 goto nla_put_failure; 563 #endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 devconf->ignore_routes_with_linkdown) < 0) 571 goto nla_put_failure; 572 573 out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577 nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584 { 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602 errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604 } 605 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611 }; 612 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 614 struct nlmsghdr *nlh, 615 struct netlink_ext_ack *extack) 616 { 617 struct net *net = sock_net(in_skb->sk); 618 struct nlattr *tb[NETCONFA_MAX+1]; 619 struct inet6_dev *in6_dev = NULL; 620 struct net_device *dev = NULL; 621 struct netconfmsg *ncm; 622 struct sk_buff *skb; 623 struct ipv6_devconf *devconf; 624 int ifindex; 625 int err; 626 627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err < 0) 630 return err; 631 632 if (!tb[NETCONFA_IFINDEX]) 633 return -EINVAL; 634 635 err = -EINVAL; 636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 637 switch (ifindex) { 638 case NETCONFA_IFINDEX_ALL: 639 devconf = net->ipv6.devconf_all; 640 break; 641 case NETCONFA_IFINDEX_DEFAULT: 642 devconf = net->ipv6.devconf_dflt; 643 break; 644 default: 645 dev = dev_get_by_index(net, ifindex); 646 if (!dev) 647 return -EINVAL; 648 in6_dev = in6_dev_get(dev); 649 if (!in6_dev) 650 goto errout; 651 devconf = &in6_dev->cnf; 652 break; 653 } 654 655 err = -ENOBUFS; 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 657 if (!skb) 658 goto errout; 659 660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 661 NETLINK_CB(in_skb).portid, 662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 663 NETCONFA_ALL); 664 if (err < 0) { 665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 666 WARN_ON(err == -EMSGSIZE); 667 kfree_skb(skb); 668 goto errout; 669 } 670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 671 errout: 672 if (in6_dev) 673 in6_dev_put(in6_dev); 674 if (dev) 675 dev_put(dev); 676 return err; 677 } 678 679 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 680 struct netlink_callback *cb) 681 { 682 struct net *net = sock_net(skb->sk); 683 int h, s_h; 684 int idx, s_idx; 685 struct net_device *dev; 686 struct inet6_dev *idev; 687 struct hlist_head *head; 688 689 s_h = cb->args[0]; 690 s_idx = idx = cb->args[1]; 691 692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 693 idx = 0; 694 head = &net->dev_index_head[h]; 695 rcu_read_lock(); 696 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 697 net->dev_base_seq; 698 hlist_for_each_entry_rcu(dev, head, index_hlist) { 699 if (idx < s_idx) 700 goto cont; 701 idev = __in6_dev_get(dev); 702 if (!idev) 703 goto cont; 704 705 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 706 &idev->cnf, 707 NETLINK_CB(cb->skb).portid, 708 cb->nlh->nlmsg_seq, 709 RTM_NEWNETCONF, 710 NLM_F_MULTI, 711 NETCONFA_ALL) < 0) { 712 rcu_read_unlock(); 713 goto done; 714 } 715 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 716 cont: 717 idx++; 718 } 719 rcu_read_unlock(); 720 } 721 if (h == NETDEV_HASHENTRIES) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 723 net->ipv6.devconf_all, 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 if (h == NETDEV_HASHENTRIES + 1) { 733 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 734 net->ipv6.devconf_dflt, 735 NETLINK_CB(cb->skb).portid, 736 cb->nlh->nlmsg_seq, 737 RTM_NEWNETCONF, NLM_F_MULTI, 738 NETCONFA_ALL) < 0) 739 goto done; 740 else 741 h++; 742 } 743 done: 744 cb->args[0] = h; 745 cb->args[1] = idx; 746 747 return skb->len; 748 } 749 750 #ifdef CONFIG_SYSCTL 751 static void dev_forward_change(struct inet6_dev *idev) 752 { 753 struct net_device *dev; 754 struct inet6_ifaddr *ifa; 755 756 if (!idev) 757 return; 758 dev = idev->dev; 759 if (idev->cnf.forwarding) 760 dev_disable_lro(dev); 761 if (dev->flags & IFF_MULTICAST) { 762 if (idev->cnf.forwarding) { 763 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 764 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 765 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 766 } else { 767 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 768 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 769 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 770 } 771 } 772 773 list_for_each_entry(ifa, &idev->addr_list, if_list) { 774 if (ifa->flags&IFA_F_TENTATIVE) 775 continue; 776 if (idev->cnf.forwarding) 777 addrconf_join_anycast(ifa); 778 else 779 addrconf_leave_anycast(ifa); 780 } 781 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 782 NETCONFA_FORWARDING, 783 dev->ifindex, &idev->cnf); 784 } 785 786 787 static void addrconf_forward_change(struct net *net, __s32 newf) 788 { 789 struct net_device *dev; 790 struct inet6_dev *idev; 791 792 for_each_netdev(net, dev) { 793 idev = __in6_dev_get(dev); 794 if (idev) { 795 int changed = (!idev->cnf.forwarding) ^ (!newf); 796 idev->cnf.forwarding = newf; 797 if (changed) 798 dev_forward_change(idev); 799 } 800 } 801 } 802 803 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 804 { 805 struct net *net; 806 int old; 807 808 if (!rtnl_trylock()) 809 return restart_syscall(); 810 811 net = (struct net *)table->extra2; 812 old = *p; 813 *p = newf; 814 815 if (p == &net->ipv6.devconf_dflt->forwarding) { 816 if ((!newf) ^ (!old)) 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 818 NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 rtnl_unlock(); 822 return 0; 823 } 824 825 if (p == &net->ipv6.devconf_all->forwarding) { 826 int old_dflt = net->ipv6.devconf_dflt->forwarding; 827 828 net->ipv6.devconf_dflt->forwarding = newf; 829 if ((!newf) ^ (!old_dflt)) 830 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 831 NETCONFA_FORWARDING, 832 NETCONFA_IFINDEX_DEFAULT, 833 net->ipv6.devconf_dflt); 834 835 addrconf_forward_change(net, newf); 836 if ((!newf) ^ (!old)) 837 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 838 NETCONFA_FORWARDING, 839 NETCONFA_IFINDEX_ALL, 840 net->ipv6.devconf_all); 841 } else if ((!newf) ^ (!old)) 842 dev_forward_change((struct inet6_dev *)table->extra1); 843 rtnl_unlock(); 844 845 if (newf) 846 rt6_purge_dflt_routers(net); 847 return 1; 848 } 849 850 static void addrconf_linkdown_change(struct net *net, __s32 newf) 851 { 852 struct net_device *dev; 853 struct inet6_dev *idev; 854 855 for_each_netdev(net, dev) { 856 idev = __in6_dev_get(dev); 857 if (idev) { 858 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 859 860 idev->cnf.ignore_routes_with_linkdown = newf; 861 if (changed) 862 inet6_netconf_notify_devconf(dev_net(dev), 863 RTM_NEWNETCONF, 864 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 865 dev->ifindex, 866 &idev->cnf); 867 } 868 } 869 } 870 871 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 872 { 873 struct net *net; 874 int old; 875 876 if (!rtnl_trylock()) 877 return restart_syscall(); 878 879 net = (struct net *)table->extra2; 880 old = *p; 881 *p = newf; 882 883 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, 886 RTM_NEWNETCONF, 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 rtnl_unlock(); 891 return 0; 892 } 893 894 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 895 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 896 addrconf_linkdown_change(net, newf); 897 if ((!newf) ^ (!old)) 898 inet6_netconf_notify_devconf(net, 899 RTM_NEWNETCONF, 900 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 901 NETCONFA_IFINDEX_ALL, 902 net->ipv6.devconf_all); 903 } 904 rtnl_unlock(); 905 906 return 1; 907 } 908 909 #endif 910 911 /* Nobody refers to this ifaddr, destroy it */ 912 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 913 { 914 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 915 916 #ifdef NET_REFCNT_DEBUG 917 pr_debug("%s\n", __func__); 918 #endif 919 920 in6_dev_put(ifp->idev); 921 922 if (cancel_delayed_work(&ifp->dad_work)) 923 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 924 ifp); 925 926 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 927 pr_warn("Freeing alive inet6 address %p\n", ifp); 928 return; 929 } 930 ip6_rt_put(ifp->rt); 931 932 kfree_rcu(ifp, rcu); 933 } 934 935 static void 936 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 937 { 938 struct list_head *p; 939 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 940 941 /* 942 * Each device address list is sorted in order of scope - 943 * global before linklocal. 944 */ 945 list_for_each(p, &idev->addr_list) { 946 struct inet6_ifaddr *ifa 947 = list_entry(p, struct inet6_ifaddr, if_list); 948 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 949 break; 950 } 951 952 list_add_tail_rcu(&ifp->if_list, p); 953 } 954 955 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 956 { 957 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 958 959 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 960 } 961 962 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 963 struct net_device *dev, unsigned int hash) 964 { 965 struct inet6_ifaddr *ifp; 966 967 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 968 if (!net_eq(dev_net(ifp->idev->dev), net)) 969 continue; 970 if (ipv6_addr_equal(&ifp->addr, addr)) { 971 if (!dev || ifp->idev->dev == dev) 972 return true; 973 } 974 } 975 return false; 976 } 977 978 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 979 { 980 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 981 int err = 0; 982 983 spin_lock(&addrconf_hash_lock); 984 985 /* Ignore adding duplicate addresses on an interface */ 986 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 987 ADBG("ipv6_add_addr: already assigned\n"); 988 err = -EEXIST; 989 } else { 990 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 991 } 992 993 spin_unlock(&addrconf_hash_lock); 994 995 return err; 996 } 997 998 /* On success it returns ifp with increased reference count */ 999 1000 static struct inet6_ifaddr * 1001 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 1002 const struct in6_addr *peer_addr, int pfxlen, 1003 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 1004 bool can_block, struct netlink_ext_ack *extack) 1005 { 1006 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1007 struct net *net = dev_net(idev->dev); 1008 struct inet6_ifaddr *ifa = NULL; 1009 struct rt6_info *rt = NULL; 1010 int err = 0; 1011 int addr_type = ipv6_addr_type(addr); 1012 1013 if (addr_type == IPV6_ADDR_ANY || 1014 addr_type & IPV6_ADDR_MULTICAST || 1015 (!(idev->dev->flags & IFF_LOOPBACK) && 1016 addr_type & IPV6_ADDR_LOOPBACK)) 1017 return ERR_PTR(-EADDRNOTAVAIL); 1018 1019 if (idev->dead) { 1020 err = -ENODEV; /*XXX*/ 1021 goto out; 1022 } 1023 1024 if (idev->cnf.disable_ipv6) { 1025 err = -EACCES; 1026 goto out; 1027 } 1028 1029 /* validator notifier needs to be blocking; 1030 * do not call in atomic context 1031 */ 1032 if (can_block) { 1033 struct in6_validator_info i6vi = { 1034 .i6vi_addr = *addr, 1035 .i6vi_dev = idev, 1036 .extack = extack, 1037 }; 1038 1039 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1040 err = notifier_to_errno(err); 1041 if (err < 0) 1042 goto out; 1043 } 1044 1045 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1046 if (!ifa) { 1047 ADBG("ipv6_add_addr: malloc failed\n"); 1048 err = -ENOBUFS; 1049 goto out; 1050 } 1051 1052 rt = addrconf_dst_alloc(idev, addr, false); 1053 if (IS_ERR(rt)) { 1054 err = PTR_ERR(rt); 1055 rt = NULL; 1056 goto out; 1057 } 1058 1059 if (net->ipv6.devconf_all->disable_policy || 1060 idev->cnf.disable_policy) 1061 rt->dst.flags |= DST_NOPOLICY; 1062 1063 neigh_parms_data_state_setall(idev->nd_parms); 1064 1065 ifa->addr = *addr; 1066 if (peer_addr) 1067 ifa->peer_addr = *peer_addr; 1068 1069 spin_lock_init(&ifa->lock); 1070 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1071 INIT_HLIST_NODE(&ifa->addr_lst); 1072 ifa->scope = scope; 1073 ifa->prefix_len = pfxlen; 1074 ifa->flags = flags; 1075 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1076 if (!(flags & IFA_F_NODAD)) 1077 ifa->flags |= IFA_F_TENTATIVE; 1078 ifa->valid_lft = valid_lft; 1079 ifa->prefered_lft = prefered_lft; 1080 ifa->cstamp = ifa->tstamp = jiffies; 1081 ifa->tokenized = false; 1082 1083 ifa->rt = rt; 1084 1085 ifa->idev = idev; 1086 in6_dev_hold(idev); 1087 1088 /* For caller */ 1089 refcount_set(&ifa->refcnt, 1); 1090 1091 rcu_read_lock_bh(); 1092 1093 err = ipv6_add_addr_hash(idev->dev, ifa); 1094 if (err < 0) { 1095 rcu_read_unlock_bh(); 1096 goto out; 1097 } 1098 1099 write_lock(&idev->lock); 1100 1101 /* Add to inet6_dev unicast addr list. */ 1102 ipv6_link_dev_addr(idev, ifa); 1103 1104 if (ifa->flags&IFA_F_TEMPORARY) { 1105 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1106 in6_ifa_hold(ifa); 1107 } 1108 1109 in6_ifa_hold(ifa); 1110 write_unlock(&idev->lock); 1111 1112 rcu_read_unlock_bh(); 1113 1114 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1115 out: 1116 if (unlikely(err < 0)) { 1117 if (rt) 1118 ip6_rt_put(rt); 1119 if (ifa) { 1120 if (ifa->idev) 1121 in6_dev_put(ifa->idev); 1122 kfree(ifa); 1123 } 1124 ifa = ERR_PTR(err); 1125 } 1126 1127 return ifa; 1128 } 1129 1130 enum cleanup_prefix_rt_t { 1131 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1132 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1133 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1134 }; 1135 1136 /* 1137 * Check, whether the prefix for ifp would still need a prefix route 1138 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1139 * constants. 1140 * 1141 * 1) we don't purge prefix if address was not permanent. 1142 * prefix is managed by its own lifetime. 1143 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1144 * 3) if there are no addresses, delete prefix. 1145 * 4) if there are still other permanent address(es), 1146 * corresponding prefix is still permanent. 1147 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1148 * don't purge the prefix, assume user space is managing it. 1149 * 6) otherwise, update prefix lifetime to the 1150 * longest valid lifetime among the corresponding 1151 * addresses on the device. 1152 * Note: subsequent RA will update lifetime. 1153 **/ 1154 static enum cleanup_prefix_rt_t 1155 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1156 { 1157 struct inet6_ifaddr *ifa; 1158 struct inet6_dev *idev = ifp->idev; 1159 unsigned long lifetime; 1160 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1161 1162 *expires = jiffies; 1163 1164 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1165 if (ifa == ifp) 1166 continue; 1167 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1168 ifp->prefix_len)) 1169 continue; 1170 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1171 return CLEANUP_PREFIX_RT_NOP; 1172 1173 action = CLEANUP_PREFIX_RT_EXPIRE; 1174 1175 spin_lock(&ifa->lock); 1176 1177 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1178 /* 1179 * Note: Because this address is 1180 * not permanent, lifetime < 1181 * LONG_MAX / HZ here. 1182 */ 1183 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1184 *expires = ifa->tstamp + lifetime * HZ; 1185 spin_unlock(&ifa->lock); 1186 } 1187 1188 return action; 1189 } 1190 1191 static void 1192 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1193 { 1194 struct rt6_info *rt; 1195 1196 rt = addrconf_get_prefix_route(&ifp->addr, 1197 ifp->prefix_len, 1198 ifp->idev->dev, 1199 0, RTF_GATEWAY | RTF_DEFAULT); 1200 if (rt) { 1201 if (del_rt) 1202 ip6_del_rt(rt); 1203 else { 1204 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1205 rt6_set_expires(rt, expires); 1206 ip6_rt_put(rt); 1207 } 1208 } 1209 } 1210 1211 1212 /* This function wants to get referenced ifp and releases it before return */ 1213 1214 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1215 { 1216 int state; 1217 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1218 unsigned long expires; 1219 1220 ASSERT_RTNL(); 1221 1222 spin_lock_bh(&ifp->lock); 1223 state = ifp->state; 1224 ifp->state = INET6_IFADDR_STATE_DEAD; 1225 spin_unlock_bh(&ifp->lock); 1226 1227 if (state == INET6_IFADDR_STATE_DEAD) 1228 goto out; 1229 1230 spin_lock_bh(&addrconf_hash_lock); 1231 hlist_del_init_rcu(&ifp->addr_lst); 1232 spin_unlock_bh(&addrconf_hash_lock); 1233 1234 write_lock_bh(&ifp->idev->lock); 1235 1236 if (ifp->flags&IFA_F_TEMPORARY) { 1237 list_del(&ifp->tmp_list); 1238 if (ifp->ifpub) { 1239 in6_ifa_put(ifp->ifpub); 1240 ifp->ifpub = NULL; 1241 } 1242 __in6_ifa_put(ifp); 1243 } 1244 1245 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1246 action = check_cleanup_prefix_route(ifp, &expires); 1247 1248 list_del_rcu(&ifp->if_list); 1249 __in6_ifa_put(ifp); 1250 1251 write_unlock_bh(&ifp->idev->lock); 1252 1253 addrconf_del_dad_work(ifp); 1254 1255 ipv6_ifa_notify(RTM_DELADDR, ifp); 1256 1257 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1258 1259 if (action != CLEANUP_PREFIX_RT_NOP) { 1260 cleanup_prefix_route(ifp, expires, 1261 action == CLEANUP_PREFIX_RT_DEL); 1262 } 1263 1264 /* clean up prefsrc entries */ 1265 rt6_remove_prefsrc(ifp); 1266 out: 1267 in6_ifa_put(ifp); 1268 } 1269 1270 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1271 struct inet6_ifaddr *ift, 1272 bool block) 1273 { 1274 struct inet6_dev *idev = ifp->idev; 1275 struct in6_addr addr, *tmpaddr; 1276 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1277 unsigned long regen_advance; 1278 int tmp_plen; 1279 int ret = 0; 1280 u32 addr_flags; 1281 unsigned long now = jiffies; 1282 long max_desync_factor; 1283 s32 cnf_temp_preferred_lft; 1284 1285 write_lock_bh(&idev->lock); 1286 if (ift) { 1287 spin_lock_bh(&ift->lock); 1288 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1289 spin_unlock_bh(&ift->lock); 1290 tmpaddr = &addr; 1291 } else { 1292 tmpaddr = NULL; 1293 } 1294 retry: 1295 in6_dev_hold(idev); 1296 if (idev->cnf.use_tempaddr <= 0) { 1297 write_unlock_bh(&idev->lock); 1298 pr_info("%s: use_tempaddr is disabled\n", __func__); 1299 in6_dev_put(idev); 1300 ret = -1; 1301 goto out; 1302 } 1303 spin_lock_bh(&ifp->lock); 1304 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1305 idev->cnf.use_tempaddr = -1; /*XXX*/ 1306 spin_unlock_bh(&ifp->lock); 1307 write_unlock_bh(&idev->lock); 1308 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1309 __func__); 1310 in6_dev_put(idev); 1311 ret = -1; 1312 goto out; 1313 } 1314 in6_ifa_hold(ifp); 1315 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1316 ipv6_try_regen_rndid(idev, tmpaddr); 1317 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1318 age = (now - ifp->tstamp) / HZ; 1319 1320 regen_advance = idev->cnf.regen_max_retry * 1321 idev->cnf.dad_transmits * 1322 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1323 1324 /* recalculate max_desync_factor each time and update 1325 * idev->desync_factor if it's larger 1326 */ 1327 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1328 max_desync_factor = min_t(__u32, 1329 idev->cnf.max_desync_factor, 1330 cnf_temp_preferred_lft - regen_advance); 1331 1332 if (unlikely(idev->desync_factor > max_desync_factor)) { 1333 if (max_desync_factor > 0) { 1334 get_random_bytes(&idev->desync_factor, 1335 sizeof(idev->desync_factor)); 1336 idev->desync_factor %= max_desync_factor; 1337 } else { 1338 idev->desync_factor = 0; 1339 } 1340 } 1341 1342 tmp_valid_lft = min_t(__u32, 1343 ifp->valid_lft, 1344 idev->cnf.temp_valid_lft + age); 1345 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1346 idev->desync_factor; 1347 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1348 tmp_plen = ifp->prefix_len; 1349 tmp_tstamp = ifp->tstamp; 1350 spin_unlock_bh(&ifp->lock); 1351 1352 write_unlock_bh(&idev->lock); 1353 1354 /* A temporary address is created only if this calculated Preferred 1355 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1356 * an implementation must not create a temporary address with a zero 1357 * Preferred Lifetime. 1358 * Use age calculation as in addrconf_verify to avoid unnecessary 1359 * temporary addresses being generated. 1360 */ 1361 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1362 if (tmp_prefered_lft <= regen_advance + age) { 1363 in6_ifa_put(ifp); 1364 in6_dev_put(idev); 1365 ret = -1; 1366 goto out; 1367 } 1368 1369 addr_flags = IFA_F_TEMPORARY; 1370 /* set in addrconf_prefix_rcv() */ 1371 if (ifp->flags & IFA_F_OPTIMISTIC) 1372 addr_flags |= IFA_F_OPTIMISTIC; 1373 1374 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1375 ipv6_addr_scope(&addr), addr_flags, 1376 tmp_valid_lft, tmp_prefered_lft, block, NULL); 1377 if (IS_ERR(ift)) { 1378 in6_ifa_put(ifp); 1379 in6_dev_put(idev); 1380 pr_info("%s: retry temporary address regeneration\n", __func__); 1381 tmpaddr = &addr; 1382 write_lock_bh(&idev->lock); 1383 goto retry; 1384 } 1385 1386 spin_lock_bh(&ift->lock); 1387 ift->ifpub = ifp; 1388 ift->cstamp = now; 1389 ift->tstamp = tmp_tstamp; 1390 spin_unlock_bh(&ift->lock); 1391 1392 addrconf_dad_start(ift); 1393 in6_ifa_put(ift); 1394 in6_dev_put(idev); 1395 out: 1396 return ret; 1397 } 1398 1399 /* 1400 * Choose an appropriate source address (RFC3484) 1401 */ 1402 enum { 1403 IPV6_SADDR_RULE_INIT = 0, 1404 IPV6_SADDR_RULE_LOCAL, 1405 IPV6_SADDR_RULE_SCOPE, 1406 IPV6_SADDR_RULE_PREFERRED, 1407 #ifdef CONFIG_IPV6_MIP6 1408 IPV6_SADDR_RULE_HOA, 1409 #endif 1410 IPV6_SADDR_RULE_OIF, 1411 IPV6_SADDR_RULE_LABEL, 1412 IPV6_SADDR_RULE_PRIVACY, 1413 IPV6_SADDR_RULE_ORCHID, 1414 IPV6_SADDR_RULE_PREFIX, 1415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1416 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1417 #endif 1418 IPV6_SADDR_RULE_MAX 1419 }; 1420 1421 struct ipv6_saddr_score { 1422 int rule; 1423 int addr_type; 1424 struct inet6_ifaddr *ifa; 1425 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1426 int scopedist; 1427 int matchlen; 1428 }; 1429 1430 struct ipv6_saddr_dst { 1431 const struct in6_addr *addr; 1432 int ifindex; 1433 int scope; 1434 int label; 1435 unsigned int prefs; 1436 }; 1437 1438 static inline int ipv6_saddr_preferred(int type) 1439 { 1440 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1441 return 1; 1442 return 0; 1443 } 1444 1445 static bool ipv6_use_optimistic_addr(struct net *net, 1446 struct inet6_dev *idev) 1447 { 1448 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1449 if (!idev) 1450 return false; 1451 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1452 return false; 1453 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1454 return false; 1455 1456 return true; 1457 #else 1458 return false; 1459 #endif 1460 } 1461 1462 static int ipv6_get_saddr_eval(struct net *net, 1463 struct ipv6_saddr_score *score, 1464 struct ipv6_saddr_dst *dst, 1465 int i) 1466 { 1467 int ret; 1468 1469 if (i <= score->rule) { 1470 switch (i) { 1471 case IPV6_SADDR_RULE_SCOPE: 1472 ret = score->scopedist; 1473 break; 1474 case IPV6_SADDR_RULE_PREFIX: 1475 ret = score->matchlen; 1476 break; 1477 default: 1478 ret = !!test_bit(i, score->scorebits); 1479 } 1480 goto out; 1481 } 1482 1483 switch (i) { 1484 case IPV6_SADDR_RULE_INIT: 1485 /* Rule 0: remember if hiscore is not ready yet */ 1486 ret = !!score->ifa; 1487 break; 1488 case IPV6_SADDR_RULE_LOCAL: 1489 /* Rule 1: Prefer same address */ 1490 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1491 break; 1492 case IPV6_SADDR_RULE_SCOPE: 1493 /* Rule 2: Prefer appropriate scope 1494 * 1495 * ret 1496 * ^ 1497 * -1 | d 15 1498 * ---+--+-+---> scope 1499 * | 1500 * | d is scope of the destination. 1501 * B-d | \ 1502 * | \ <- smaller scope is better if 1503 * B-15 | \ if scope is enough for destination. 1504 * | ret = B - scope (-1 <= scope >= d <= 15). 1505 * d-C-1 | / 1506 * |/ <- greater is better 1507 * -C / if scope is not enough for destination. 1508 * /| ret = scope - C (-1 <= d < scope <= 15). 1509 * 1510 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1511 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1512 * Assume B = 0 and we get C > 29. 1513 */ 1514 ret = __ipv6_addr_src_scope(score->addr_type); 1515 if (ret >= dst->scope) 1516 ret = -ret; 1517 else 1518 ret -= 128; /* 30 is enough */ 1519 score->scopedist = ret; 1520 break; 1521 case IPV6_SADDR_RULE_PREFERRED: 1522 { 1523 /* Rule 3: Avoid deprecated and optimistic addresses */ 1524 u8 avoid = IFA_F_DEPRECATED; 1525 1526 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1527 avoid |= IFA_F_OPTIMISTIC; 1528 ret = ipv6_saddr_preferred(score->addr_type) || 1529 !(score->ifa->flags & avoid); 1530 break; 1531 } 1532 #ifdef CONFIG_IPV6_MIP6 1533 case IPV6_SADDR_RULE_HOA: 1534 { 1535 /* Rule 4: Prefer home address */ 1536 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1537 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1538 break; 1539 } 1540 #endif 1541 case IPV6_SADDR_RULE_OIF: 1542 /* Rule 5: Prefer outgoing interface */ 1543 ret = (!dst->ifindex || 1544 dst->ifindex == score->ifa->idev->dev->ifindex); 1545 break; 1546 case IPV6_SADDR_RULE_LABEL: 1547 /* Rule 6: Prefer matching label */ 1548 ret = ipv6_addr_label(net, 1549 &score->ifa->addr, score->addr_type, 1550 score->ifa->idev->dev->ifindex) == dst->label; 1551 break; 1552 case IPV6_SADDR_RULE_PRIVACY: 1553 { 1554 /* Rule 7: Prefer public address 1555 * Note: prefer temporary address if use_tempaddr >= 2 1556 */ 1557 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1558 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1559 score->ifa->idev->cnf.use_tempaddr >= 2; 1560 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1561 break; 1562 } 1563 case IPV6_SADDR_RULE_ORCHID: 1564 /* Rule 8-: Prefer ORCHID vs ORCHID or 1565 * non-ORCHID vs non-ORCHID 1566 */ 1567 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1568 ipv6_addr_orchid(dst->addr)); 1569 break; 1570 case IPV6_SADDR_RULE_PREFIX: 1571 /* Rule 8: Use longest matching prefix */ 1572 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1573 if (ret > score->ifa->prefix_len) 1574 ret = score->ifa->prefix_len; 1575 score->matchlen = ret; 1576 break; 1577 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1578 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1579 /* Optimistic addresses still have lower precedence than other 1580 * preferred addresses. 1581 */ 1582 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1583 break; 1584 #endif 1585 default: 1586 ret = 0; 1587 } 1588 1589 if (ret) 1590 __set_bit(i, score->scorebits); 1591 score->rule = i; 1592 out: 1593 return ret; 1594 } 1595 1596 static int __ipv6_dev_get_saddr(struct net *net, 1597 struct ipv6_saddr_dst *dst, 1598 struct inet6_dev *idev, 1599 struct ipv6_saddr_score *scores, 1600 int hiscore_idx) 1601 { 1602 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1603 1604 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1605 int i; 1606 1607 /* 1608 * - Tentative Address (RFC2462 section 5.4) 1609 * - A tentative address is not considered 1610 * "assigned to an interface" in the traditional 1611 * sense, unless it is also flagged as optimistic. 1612 * - Candidate Source Address (section 4) 1613 * - In any case, anycast addresses, multicast 1614 * addresses, and the unspecified address MUST 1615 * NOT be included in a candidate set. 1616 */ 1617 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1618 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1619 continue; 1620 1621 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1622 1623 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1624 score->addr_type & IPV6_ADDR_MULTICAST)) { 1625 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1626 idev->dev->name); 1627 continue; 1628 } 1629 1630 score->rule = -1; 1631 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1632 1633 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1634 int minihiscore, miniscore; 1635 1636 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1637 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1638 1639 if (minihiscore > miniscore) { 1640 if (i == IPV6_SADDR_RULE_SCOPE && 1641 score->scopedist > 0) { 1642 /* 1643 * special case: 1644 * each remaining entry 1645 * has too small (not enough) 1646 * scope, because ifa entries 1647 * are sorted by their scope 1648 * values. 1649 */ 1650 goto out; 1651 } 1652 break; 1653 } else if (minihiscore < miniscore) { 1654 swap(hiscore, score); 1655 hiscore_idx = 1 - hiscore_idx; 1656 1657 /* restore our iterator */ 1658 score->ifa = hiscore->ifa; 1659 1660 break; 1661 } 1662 } 1663 } 1664 out: 1665 return hiscore_idx; 1666 } 1667 1668 static int ipv6_get_saddr_master(struct net *net, 1669 const struct net_device *dst_dev, 1670 const struct net_device *master, 1671 struct ipv6_saddr_dst *dst, 1672 struct ipv6_saddr_score *scores, 1673 int hiscore_idx) 1674 { 1675 struct inet6_dev *idev; 1676 1677 idev = __in6_dev_get(dst_dev); 1678 if (idev) 1679 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1680 scores, hiscore_idx); 1681 1682 idev = __in6_dev_get(master); 1683 if (idev) 1684 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1685 scores, hiscore_idx); 1686 1687 return hiscore_idx; 1688 } 1689 1690 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1691 const struct in6_addr *daddr, unsigned int prefs, 1692 struct in6_addr *saddr) 1693 { 1694 struct ipv6_saddr_score scores[2], *hiscore; 1695 struct ipv6_saddr_dst dst; 1696 struct inet6_dev *idev; 1697 struct net_device *dev; 1698 int dst_type; 1699 bool use_oif_addr = false; 1700 int hiscore_idx = 0; 1701 int ret = 0; 1702 1703 dst_type = __ipv6_addr_type(daddr); 1704 dst.addr = daddr; 1705 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1706 dst.scope = __ipv6_addr_src_scope(dst_type); 1707 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1708 dst.prefs = prefs; 1709 1710 scores[hiscore_idx].rule = -1; 1711 scores[hiscore_idx].ifa = NULL; 1712 1713 rcu_read_lock(); 1714 1715 /* Candidate Source Address (section 4) 1716 * - multicast and link-local destination address, 1717 * the set of candidate source address MUST only 1718 * include addresses assigned to interfaces 1719 * belonging to the same link as the outgoing 1720 * interface. 1721 * (- For site-local destination addresses, the 1722 * set of candidate source addresses MUST only 1723 * include addresses assigned to interfaces 1724 * belonging to the same site as the outgoing 1725 * interface.) 1726 * - "It is RECOMMENDED that the candidate source addresses 1727 * be the set of unicast addresses assigned to the 1728 * interface that will be used to send to the destination 1729 * (the 'outgoing' interface)." (RFC 6724) 1730 */ 1731 if (dst_dev) { 1732 idev = __in6_dev_get(dst_dev); 1733 if ((dst_type & IPV6_ADDR_MULTICAST) || 1734 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1735 (idev && idev->cnf.use_oif_addrs_only)) { 1736 use_oif_addr = true; 1737 } 1738 } 1739 1740 if (use_oif_addr) { 1741 if (idev) 1742 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1743 } else { 1744 const struct net_device *master; 1745 int master_idx = 0; 1746 1747 /* if dst_dev exists and is enslaved to an L3 device, then 1748 * prefer addresses from dst_dev and then the master over 1749 * any other enslaved devices in the L3 domain. 1750 */ 1751 master = l3mdev_master_dev_rcu(dst_dev); 1752 if (master) { 1753 master_idx = master->ifindex; 1754 1755 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1756 master, &dst, 1757 scores, hiscore_idx); 1758 1759 if (scores[hiscore_idx].ifa) 1760 goto out; 1761 } 1762 1763 for_each_netdev_rcu(net, dev) { 1764 /* only consider addresses on devices in the 1765 * same L3 domain 1766 */ 1767 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1768 continue; 1769 idev = __in6_dev_get(dev); 1770 if (!idev) 1771 continue; 1772 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1773 } 1774 } 1775 1776 out: 1777 hiscore = &scores[hiscore_idx]; 1778 if (!hiscore->ifa) 1779 ret = -EADDRNOTAVAIL; 1780 else 1781 *saddr = hiscore->ifa->addr; 1782 1783 rcu_read_unlock(); 1784 return ret; 1785 } 1786 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1787 1788 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1789 u32 banned_flags) 1790 { 1791 struct inet6_ifaddr *ifp; 1792 int err = -EADDRNOTAVAIL; 1793 1794 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1795 if (ifp->scope > IFA_LINK) 1796 break; 1797 if (ifp->scope == IFA_LINK && 1798 !(ifp->flags & banned_flags)) { 1799 *addr = ifp->addr; 1800 err = 0; 1801 break; 1802 } 1803 } 1804 return err; 1805 } 1806 1807 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1808 u32 banned_flags) 1809 { 1810 struct inet6_dev *idev; 1811 int err = -EADDRNOTAVAIL; 1812 1813 rcu_read_lock(); 1814 idev = __in6_dev_get(dev); 1815 if (idev) { 1816 read_lock_bh(&idev->lock); 1817 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1818 read_unlock_bh(&idev->lock); 1819 } 1820 rcu_read_unlock(); 1821 return err; 1822 } 1823 1824 static int ipv6_count_addresses(const struct inet6_dev *idev) 1825 { 1826 const struct inet6_ifaddr *ifp; 1827 int cnt = 0; 1828 1829 rcu_read_lock(); 1830 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1831 cnt++; 1832 rcu_read_unlock(); 1833 return cnt; 1834 } 1835 1836 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1837 const struct net_device *dev, int strict) 1838 { 1839 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1840 } 1841 EXPORT_SYMBOL(ipv6_chk_addr); 1842 1843 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1844 const struct net_device *dev, int strict, 1845 u32 banned_flags) 1846 { 1847 unsigned int hash = inet6_addr_hash(net, addr); 1848 struct inet6_ifaddr *ifp; 1849 u32 ifp_flags; 1850 1851 rcu_read_lock(); 1852 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1853 if (!net_eq(dev_net(ifp->idev->dev), net)) 1854 continue; 1855 /* Decouple optimistic from tentative for evaluation here. 1856 * Ban optimistic addresses explicitly, when required. 1857 */ 1858 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1859 ? (ifp->flags&~IFA_F_TENTATIVE) 1860 : ifp->flags; 1861 if (ipv6_addr_equal(&ifp->addr, addr) && 1862 !(ifp_flags&banned_flags) && 1863 (!dev || ifp->idev->dev == dev || 1864 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1865 rcu_read_unlock(); 1866 return 1; 1867 } 1868 } 1869 1870 rcu_read_unlock(); 1871 return 0; 1872 } 1873 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1874 1875 1876 /* Compares an address/prefix_len with addresses on device @dev. 1877 * If one is found it returns true. 1878 */ 1879 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1880 const unsigned int prefix_len, struct net_device *dev) 1881 { 1882 const struct inet6_ifaddr *ifa; 1883 const struct inet6_dev *idev; 1884 bool ret = false; 1885 1886 rcu_read_lock(); 1887 idev = __in6_dev_get(dev); 1888 if (idev) { 1889 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1890 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1891 if (ret) 1892 break; 1893 } 1894 } 1895 rcu_read_unlock(); 1896 1897 return ret; 1898 } 1899 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1900 1901 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1902 { 1903 const struct inet6_ifaddr *ifa; 1904 const struct inet6_dev *idev; 1905 int onlink; 1906 1907 onlink = 0; 1908 rcu_read_lock(); 1909 idev = __in6_dev_get(dev); 1910 if (idev) { 1911 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1912 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1913 ifa->prefix_len); 1914 if (onlink) 1915 break; 1916 } 1917 } 1918 rcu_read_unlock(); 1919 return onlink; 1920 } 1921 EXPORT_SYMBOL(ipv6_chk_prefix); 1922 1923 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1924 struct net_device *dev, int strict) 1925 { 1926 unsigned int hash = inet6_addr_hash(net, addr); 1927 struct inet6_ifaddr *ifp, *result = NULL; 1928 1929 rcu_read_lock(); 1930 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1931 if (!net_eq(dev_net(ifp->idev->dev), net)) 1932 continue; 1933 if (ipv6_addr_equal(&ifp->addr, addr)) { 1934 if (!dev || ifp->idev->dev == dev || 1935 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1936 result = ifp; 1937 in6_ifa_hold(ifp); 1938 break; 1939 } 1940 } 1941 } 1942 rcu_read_unlock(); 1943 1944 return result; 1945 } 1946 1947 /* Gets referenced address, destroys ifaddr */ 1948 1949 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1950 { 1951 if (dad_failed) 1952 ifp->flags |= IFA_F_DADFAILED; 1953 1954 if (ifp->flags&IFA_F_TEMPORARY) { 1955 struct inet6_ifaddr *ifpub; 1956 spin_lock_bh(&ifp->lock); 1957 ifpub = ifp->ifpub; 1958 if (ifpub) { 1959 in6_ifa_hold(ifpub); 1960 spin_unlock_bh(&ifp->lock); 1961 ipv6_create_tempaddr(ifpub, ifp, true); 1962 in6_ifa_put(ifpub); 1963 } else { 1964 spin_unlock_bh(&ifp->lock); 1965 } 1966 ipv6_del_addr(ifp); 1967 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1968 spin_lock_bh(&ifp->lock); 1969 addrconf_del_dad_work(ifp); 1970 ifp->flags |= IFA_F_TENTATIVE; 1971 spin_unlock_bh(&ifp->lock); 1972 if (dad_failed) 1973 ipv6_ifa_notify(0, ifp); 1974 in6_ifa_put(ifp); 1975 } else { 1976 ipv6_del_addr(ifp); 1977 } 1978 } 1979 1980 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1981 { 1982 int err = -ENOENT; 1983 1984 spin_lock_bh(&ifp->lock); 1985 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1986 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1987 err = 0; 1988 } 1989 spin_unlock_bh(&ifp->lock); 1990 1991 return err; 1992 } 1993 1994 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 1995 { 1996 struct inet6_dev *idev = ifp->idev; 1997 struct net *net = dev_net(ifp->idev->dev); 1998 1999 if (addrconf_dad_end(ifp)) { 2000 in6_ifa_put(ifp); 2001 return; 2002 } 2003 2004 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2005 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2006 2007 spin_lock_bh(&ifp->lock); 2008 2009 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2010 int scope = ifp->scope; 2011 u32 flags = ifp->flags; 2012 struct in6_addr new_addr; 2013 struct inet6_ifaddr *ifp2; 2014 u32 valid_lft, preferred_lft; 2015 int pfxlen = ifp->prefix_len; 2016 int retries = ifp->stable_privacy_retry + 1; 2017 2018 if (retries > net->ipv6.sysctl.idgen_retries) { 2019 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2020 ifp->idev->dev->name); 2021 goto errdad; 2022 } 2023 2024 new_addr = ifp->addr; 2025 if (ipv6_generate_stable_address(&new_addr, retries, 2026 idev)) 2027 goto errdad; 2028 2029 valid_lft = ifp->valid_lft; 2030 preferred_lft = ifp->prefered_lft; 2031 2032 spin_unlock_bh(&ifp->lock); 2033 2034 if (idev->cnf.max_addresses && 2035 ipv6_count_addresses(idev) >= 2036 idev->cnf.max_addresses) 2037 goto lock_errdad; 2038 2039 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2040 ifp->idev->dev->name); 2041 2042 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2043 scope, flags, valid_lft, 2044 preferred_lft, false, NULL); 2045 if (IS_ERR(ifp2)) 2046 goto lock_errdad; 2047 2048 spin_lock_bh(&ifp2->lock); 2049 ifp2->stable_privacy_retry = retries; 2050 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2051 spin_unlock_bh(&ifp2->lock); 2052 2053 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2054 in6_ifa_put(ifp2); 2055 lock_errdad: 2056 spin_lock_bh(&ifp->lock); 2057 } 2058 2059 errdad: 2060 /* transition from _POSTDAD to _ERRDAD */ 2061 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2062 spin_unlock_bh(&ifp->lock); 2063 2064 addrconf_mod_dad_work(ifp, 0); 2065 in6_ifa_put(ifp); 2066 } 2067 2068 /* Join to solicited addr multicast group. 2069 * caller must hold RTNL */ 2070 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2071 { 2072 struct in6_addr maddr; 2073 2074 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2075 return; 2076 2077 addrconf_addr_solict_mult(addr, &maddr); 2078 ipv6_dev_mc_inc(dev, &maddr); 2079 } 2080 2081 /* caller must hold RTNL */ 2082 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2083 { 2084 struct in6_addr maddr; 2085 2086 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2087 return; 2088 2089 addrconf_addr_solict_mult(addr, &maddr); 2090 __ipv6_dev_mc_dec(idev, &maddr); 2091 } 2092 2093 /* caller must hold RTNL */ 2094 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2095 { 2096 struct in6_addr addr; 2097 2098 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2099 return; 2100 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2101 if (ipv6_addr_any(&addr)) 2102 return; 2103 __ipv6_dev_ac_inc(ifp->idev, &addr); 2104 } 2105 2106 /* caller must hold RTNL */ 2107 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2108 { 2109 struct in6_addr addr; 2110 2111 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2112 return; 2113 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2114 if (ipv6_addr_any(&addr)) 2115 return; 2116 __ipv6_dev_ac_dec(ifp->idev, &addr); 2117 } 2118 2119 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2120 { 2121 switch (dev->addr_len) { 2122 case ETH_ALEN: 2123 memcpy(eui, dev->dev_addr, 3); 2124 eui[3] = 0xFF; 2125 eui[4] = 0xFE; 2126 memcpy(eui + 5, dev->dev_addr + 3, 3); 2127 break; 2128 case EUI64_ADDR_LEN: 2129 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2130 eui[0] ^= 2; 2131 break; 2132 default: 2133 return -1; 2134 } 2135 2136 return 0; 2137 } 2138 2139 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2140 { 2141 union fwnet_hwaddr *ha; 2142 2143 if (dev->addr_len != FWNET_ALEN) 2144 return -1; 2145 2146 ha = (union fwnet_hwaddr *)dev->dev_addr; 2147 2148 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2149 eui[0] ^= 2; 2150 return 0; 2151 } 2152 2153 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2154 { 2155 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2156 if (dev->addr_len != ARCNET_ALEN) 2157 return -1; 2158 memset(eui, 0, 7); 2159 eui[7] = *(u8 *)dev->dev_addr; 2160 return 0; 2161 } 2162 2163 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2164 { 2165 if (dev->addr_len != INFINIBAND_ALEN) 2166 return -1; 2167 memcpy(eui, dev->dev_addr + 12, 8); 2168 eui[0] |= 2; 2169 return 0; 2170 } 2171 2172 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2173 { 2174 if (addr == 0) 2175 return -1; 2176 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2177 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2178 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2179 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2180 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2181 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2182 eui[1] = 0; 2183 eui[2] = 0x5E; 2184 eui[3] = 0xFE; 2185 memcpy(eui + 4, &addr, 4); 2186 return 0; 2187 } 2188 2189 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2190 { 2191 if (dev->priv_flags & IFF_ISATAP) 2192 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2193 return -1; 2194 } 2195 2196 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2197 { 2198 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2199 } 2200 2201 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2202 { 2203 memcpy(eui, dev->perm_addr, 3); 2204 memcpy(eui + 5, dev->perm_addr + 3, 3); 2205 eui[3] = 0xFF; 2206 eui[4] = 0xFE; 2207 eui[0] ^= 2; 2208 return 0; 2209 } 2210 2211 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2212 { 2213 switch (dev->type) { 2214 case ARPHRD_ETHER: 2215 case ARPHRD_FDDI: 2216 return addrconf_ifid_eui48(eui, dev); 2217 case ARPHRD_ARCNET: 2218 return addrconf_ifid_arcnet(eui, dev); 2219 case ARPHRD_INFINIBAND: 2220 return addrconf_ifid_infiniband(eui, dev); 2221 case ARPHRD_SIT: 2222 return addrconf_ifid_sit(eui, dev); 2223 case ARPHRD_IPGRE: 2224 case ARPHRD_TUNNEL: 2225 return addrconf_ifid_gre(eui, dev); 2226 case ARPHRD_6LOWPAN: 2227 return addrconf_ifid_6lowpan(eui, dev); 2228 case ARPHRD_IEEE1394: 2229 return addrconf_ifid_ieee1394(eui, dev); 2230 case ARPHRD_TUNNEL6: 2231 case ARPHRD_IP6GRE: 2232 return addrconf_ifid_ip6tnl(eui, dev); 2233 } 2234 return -1; 2235 } 2236 2237 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2238 { 2239 int err = -1; 2240 struct inet6_ifaddr *ifp; 2241 2242 read_lock_bh(&idev->lock); 2243 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2244 if (ifp->scope > IFA_LINK) 2245 break; 2246 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2247 memcpy(eui, ifp->addr.s6_addr+8, 8); 2248 err = 0; 2249 break; 2250 } 2251 } 2252 read_unlock_bh(&idev->lock); 2253 return err; 2254 } 2255 2256 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2257 static void ipv6_regen_rndid(struct inet6_dev *idev) 2258 { 2259 regen: 2260 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2261 idev->rndid[0] &= ~0x02; 2262 2263 /* 2264 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2265 * check if generated address is not inappropriate 2266 * 2267 * - Reserved subnet anycast (RFC 2526) 2268 * 11111101 11....11 1xxxxxxx 2269 * - ISATAP (RFC4214) 6.1 2270 * 00-00-5E-FE-xx-xx-xx-xx 2271 * - value 0 2272 * - XXX: already assigned to an address on the device 2273 */ 2274 if (idev->rndid[0] == 0xfd && 2275 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2276 (idev->rndid[7]&0x80)) 2277 goto regen; 2278 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2279 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2280 goto regen; 2281 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2282 goto regen; 2283 } 2284 } 2285 2286 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2287 { 2288 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2289 ipv6_regen_rndid(idev); 2290 } 2291 2292 /* 2293 * Add prefix route. 2294 */ 2295 2296 static void 2297 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2298 unsigned long expires, u32 flags) 2299 { 2300 struct fib6_config cfg = { 2301 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2302 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2303 .fc_ifindex = dev->ifindex, 2304 .fc_expires = expires, 2305 .fc_dst_len = plen, 2306 .fc_flags = RTF_UP | flags, 2307 .fc_nlinfo.nl_net = dev_net(dev), 2308 .fc_protocol = RTPROT_KERNEL, 2309 }; 2310 2311 cfg.fc_dst = *pfx; 2312 2313 /* Prevent useless cloning on PtP SIT. 2314 This thing is done here expecting that the whole 2315 class of non-broadcast devices need not cloning. 2316 */ 2317 #if IS_ENABLED(CONFIG_IPV6_SIT) 2318 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2319 cfg.fc_flags |= RTF_NONEXTHOP; 2320 #endif 2321 2322 ip6_route_add(&cfg, NULL); 2323 } 2324 2325 2326 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2327 int plen, 2328 const struct net_device *dev, 2329 u32 flags, u32 noflags) 2330 { 2331 struct fib6_node *fn; 2332 struct rt6_info *rt = NULL; 2333 struct fib6_table *table; 2334 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2335 2336 table = fib6_get_table(dev_net(dev), tb_id); 2337 if (!table) 2338 return NULL; 2339 2340 rcu_read_lock(); 2341 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2342 if (!fn) 2343 goto out; 2344 2345 for_each_fib6_node_rt_rcu(fn) { 2346 if (rt->dst.dev->ifindex != dev->ifindex) 2347 continue; 2348 if ((rt->rt6i_flags & flags) != flags) 2349 continue; 2350 if ((rt->rt6i_flags & noflags) != 0) 2351 continue; 2352 if (!dst_hold_safe(&rt->dst)) 2353 rt = NULL; 2354 break; 2355 } 2356 out: 2357 rcu_read_unlock(); 2358 return rt; 2359 } 2360 2361 2362 /* Create "default" multicast route to the interface */ 2363 2364 static void addrconf_add_mroute(struct net_device *dev) 2365 { 2366 struct fib6_config cfg = { 2367 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2368 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2369 .fc_ifindex = dev->ifindex, 2370 .fc_dst_len = 8, 2371 .fc_flags = RTF_UP, 2372 .fc_nlinfo.nl_net = dev_net(dev), 2373 }; 2374 2375 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2376 2377 ip6_route_add(&cfg, NULL); 2378 } 2379 2380 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2381 { 2382 struct inet6_dev *idev; 2383 2384 ASSERT_RTNL(); 2385 2386 idev = ipv6_find_idev(dev); 2387 if (!idev) 2388 return ERR_PTR(-ENOBUFS); 2389 2390 if (idev->cnf.disable_ipv6) 2391 return ERR_PTR(-EACCES); 2392 2393 /* Add default multicast route */ 2394 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2395 addrconf_add_mroute(dev); 2396 2397 return idev; 2398 } 2399 2400 static void manage_tempaddrs(struct inet6_dev *idev, 2401 struct inet6_ifaddr *ifp, 2402 __u32 valid_lft, __u32 prefered_lft, 2403 bool create, unsigned long now) 2404 { 2405 u32 flags; 2406 struct inet6_ifaddr *ift; 2407 2408 read_lock_bh(&idev->lock); 2409 /* update all temporary addresses in the list */ 2410 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2411 int age, max_valid, max_prefered; 2412 2413 if (ifp != ift->ifpub) 2414 continue; 2415 2416 /* RFC 4941 section 3.3: 2417 * If a received option will extend the lifetime of a public 2418 * address, the lifetimes of temporary addresses should 2419 * be extended, subject to the overall constraint that no 2420 * temporary addresses should ever remain "valid" or "preferred" 2421 * for a time longer than (TEMP_VALID_LIFETIME) or 2422 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2423 */ 2424 age = (now - ift->cstamp) / HZ; 2425 max_valid = idev->cnf.temp_valid_lft - age; 2426 if (max_valid < 0) 2427 max_valid = 0; 2428 2429 max_prefered = idev->cnf.temp_prefered_lft - 2430 idev->desync_factor - age; 2431 if (max_prefered < 0) 2432 max_prefered = 0; 2433 2434 if (valid_lft > max_valid) 2435 valid_lft = max_valid; 2436 2437 if (prefered_lft > max_prefered) 2438 prefered_lft = max_prefered; 2439 2440 spin_lock(&ift->lock); 2441 flags = ift->flags; 2442 ift->valid_lft = valid_lft; 2443 ift->prefered_lft = prefered_lft; 2444 ift->tstamp = now; 2445 if (prefered_lft > 0) 2446 ift->flags &= ~IFA_F_DEPRECATED; 2447 2448 spin_unlock(&ift->lock); 2449 if (!(flags&IFA_F_TENTATIVE)) 2450 ipv6_ifa_notify(0, ift); 2451 } 2452 2453 if ((create || list_empty(&idev->tempaddr_list)) && 2454 idev->cnf.use_tempaddr > 0) { 2455 /* When a new public address is created as described 2456 * in [ADDRCONF], also create a new temporary address. 2457 * Also create a temporary address if it's enabled but 2458 * no temporary address currently exists. 2459 */ 2460 read_unlock_bh(&idev->lock); 2461 ipv6_create_tempaddr(ifp, NULL, false); 2462 } else { 2463 read_unlock_bh(&idev->lock); 2464 } 2465 } 2466 2467 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2468 { 2469 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2470 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2471 } 2472 2473 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2474 const struct prefix_info *pinfo, 2475 struct inet6_dev *in6_dev, 2476 const struct in6_addr *addr, int addr_type, 2477 u32 addr_flags, bool sllao, bool tokenized, 2478 __u32 valid_lft, u32 prefered_lft) 2479 { 2480 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2481 int create = 0, update_lft = 0; 2482 2483 if (!ifp && valid_lft) { 2484 int max_addresses = in6_dev->cnf.max_addresses; 2485 2486 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2487 if ((net->ipv6.devconf_all->optimistic_dad || 2488 in6_dev->cnf.optimistic_dad) && 2489 !net->ipv6.devconf_all->forwarding && sllao) 2490 addr_flags |= IFA_F_OPTIMISTIC; 2491 #endif 2492 2493 /* Do not allow to create too much of autoconfigured 2494 * addresses; this would be too easy way to crash kernel. 2495 */ 2496 if (!max_addresses || 2497 ipv6_count_addresses(in6_dev) < max_addresses) 2498 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2499 pinfo->prefix_len, 2500 addr_type&IPV6_ADDR_SCOPE_MASK, 2501 addr_flags, valid_lft, 2502 prefered_lft, false, NULL); 2503 2504 if (IS_ERR_OR_NULL(ifp)) 2505 return -1; 2506 2507 update_lft = 0; 2508 create = 1; 2509 spin_lock_bh(&ifp->lock); 2510 ifp->flags |= IFA_F_MANAGETEMPADDR; 2511 ifp->cstamp = jiffies; 2512 ifp->tokenized = tokenized; 2513 spin_unlock_bh(&ifp->lock); 2514 addrconf_dad_start(ifp); 2515 } 2516 2517 if (ifp) { 2518 u32 flags; 2519 unsigned long now; 2520 u32 stored_lft; 2521 2522 /* update lifetime (RFC2462 5.5.3 e) */ 2523 spin_lock_bh(&ifp->lock); 2524 now = jiffies; 2525 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2526 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2527 else 2528 stored_lft = 0; 2529 if (!update_lft && !create && stored_lft) { 2530 const u32 minimum_lft = min_t(u32, 2531 stored_lft, MIN_VALID_LIFETIME); 2532 valid_lft = max(valid_lft, minimum_lft); 2533 2534 /* RFC4862 Section 5.5.3e: 2535 * "Note that the preferred lifetime of the 2536 * corresponding address is always reset to 2537 * the Preferred Lifetime in the received 2538 * Prefix Information option, regardless of 2539 * whether the valid lifetime is also reset or 2540 * ignored." 2541 * 2542 * So we should always update prefered_lft here. 2543 */ 2544 update_lft = 1; 2545 } 2546 2547 if (update_lft) { 2548 ifp->valid_lft = valid_lft; 2549 ifp->prefered_lft = prefered_lft; 2550 ifp->tstamp = now; 2551 flags = ifp->flags; 2552 ifp->flags &= ~IFA_F_DEPRECATED; 2553 spin_unlock_bh(&ifp->lock); 2554 2555 if (!(flags&IFA_F_TENTATIVE)) 2556 ipv6_ifa_notify(0, ifp); 2557 } else 2558 spin_unlock_bh(&ifp->lock); 2559 2560 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2561 create, now); 2562 2563 in6_ifa_put(ifp); 2564 addrconf_verify(); 2565 } 2566 2567 return 0; 2568 } 2569 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2570 2571 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2572 { 2573 struct prefix_info *pinfo; 2574 __u32 valid_lft; 2575 __u32 prefered_lft; 2576 int addr_type, err; 2577 u32 addr_flags = 0; 2578 struct inet6_dev *in6_dev; 2579 struct net *net = dev_net(dev); 2580 2581 pinfo = (struct prefix_info *) opt; 2582 2583 if (len < sizeof(struct prefix_info)) { 2584 ADBG("addrconf: prefix option too short\n"); 2585 return; 2586 } 2587 2588 /* 2589 * Validation checks ([ADDRCONF], page 19) 2590 */ 2591 2592 addr_type = ipv6_addr_type(&pinfo->prefix); 2593 2594 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2595 return; 2596 2597 valid_lft = ntohl(pinfo->valid); 2598 prefered_lft = ntohl(pinfo->prefered); 2599 2600 if (prefered_lft > valid_lft) { 2601 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2602 return; 2603 } 2604 2605 in6_dev = in6_dev_get(dev); 2606 2607 if (!in6_dev) { 2608 net_dbg_ratelimited("addrconf: device %s not configured\n", 2609 dev->name); 2610 return; 2611 } 2612 2613 /* 2614 * Two things going on here: 2615 * 1) Add routes for on-link prefixes 2616 * 2) Configure prefixes with the auto flag set 2617 */ 2618 2619 if (pinfo->onlink) { 2620 struct rt6_info *rt; 2621 unsigned long rt_expires; 2622 2623 /* Avoid arithmetic overflow. Really, we could 2624 * save rt_expires in seconds, likely valid_lft, 2625 * but it would require division in fib gc, that it 2626 * not good. 2627 */ 2628 if (HZ > USER_HZ) 2629 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2630 else 2631 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2632 2633 if (addrconf_finite_timeout(rt_expires)) 2634 rt_expires *= HZ; 2635 2636 rt = addrconf_get_prefix_route(&pinfo->prefix, 2637 pinfo->prefix_len, 2638 dev, 2639 RTF_ADDRCONF | RTF_PREFIX_RT, 2640 RTF_GATEWAY | RTF_DEFAULT); 2641 2642 if (rt) { 2643 /* Autoconf prefix route */ 2644 if (valid_lft == 0) { 2645 ip6_del_rt(rt); 2646 rt = NULL; 2647 } else if (addrconf_finite_timeout(rt_expires)) { 2648 /* not infinity */ 2649 rt6_set_expires(rt, jiffies + rt_expires); 2650 } else { 2651 rt6_clean_expires(rt); 2652 } 2653 } else if (valid_lft) { 2654 clock_t expires = 0; 2655 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2656 if (addrconf_finite_timeout(rt_expires)) { 2657 /* not infinity */ 2658 flags |= RTF_EXPIRES; 2659 expires = jiffies_to_clock_t(rt_expires); 2660 } 2661 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2662 dev, expires, flags); 2663 } 2664 ip6_rt_put(rt); 2665 } 2666 2667 /* Try to figure out our local address for this prefix */ 2668 2669 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2670 struct in6_addr addr; 2671 bool tokenized = false, dev_addr_generated = false; 2672 2673 if (pinfo->prefix_len == 64) { 2674 memcpy(&addr, &pinfo->prefix, 8); 2675 2676 if (!ipv6_addr_any(&in6_dev->token)) { 2677 read_lock_bh(&in6_dev->lock); 2678 memcpy(addr.s6_addr + 8, 2679 in6_dev->token.s6_addr + 8, 8); 2680 read_unlock_bh(&in6_dev->lock); 2681 tokenized = true; 2682 } else if (is_addr_mode_generate_stable(in6_dev) && 2683 !ipv6_generate_stable_address(&addr, 0, 2684 in6_dev)) { 2685 addr_flags |= IFA_F_STABLE_PRIVACY; 2686 goto ok; 2687 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2688 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2689 goto put; 2690 } else { 2691 dev_addr_generated = true; 2692 } 2693 goto ok; 2694 } 2695 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2696 pinfo->prefix_len); 2697 goto put; 2698 2699 ok: 2700 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2701 &addr, addr_type, 2702 addr_flags, sllao, 2703 tokenized, valid_lft, 2704 prefered_lft); 2705 if (err) 2706 goto put; 2707 2708 /* Ignore error case here because previous prefix add addr was 2709 * successful which will be notified. 2710 */ 2711 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2712 addr_type, addr_flags, sllao, 2713 tokenized, valid_lft, 2714 prefered_lft, 2715 dev_addr_generated); 2716 } 2717 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2718 put: 2719 in6_dev_put(in6_dev); 2720 } 2721 2722 /* 2723 * Set destination address. 2724 * Special case for SIT interfaces where we create a new "virtual" 2725 * device. 2726 */ 2727 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2728 { 2729 struct in6_ifreq ireq; 2730 struct net_device *dev; 2731 int err = -EINVAL; 2732 2733 rtnl_lock(); 2734 2735 err = -EFAULT; 2736 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2737 goto err_exit; 2738 2739 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2740 2741 err = -ENODEV; 2742 if (!dev) 2743 goto err_exit; 2744 2745 #if IS_ENABLED(CONFIG_IPV6_SIT) 2746 if (dev->type == ARPHRD_SIT) { 2747 const struct net_device_ops *ops = dev->netdev_ops; 2748 struct ifreq ifr; 2749 struct ip_tunnel_parm p; 2750 2751 err = -EADDRNOTAVAIL; 2752 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2753 goto err_exit; 2754 2755 memset(&p, 0, sizeof(p)); 2756 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2757 p.iph.saddr = 0; 2758 p.iph.version = 4; 2759 p.iph.ihl = 5; 2760 p.iph.protocol = IPPROTO_IPV6; 2761 p.iph.ttl = 64; 2762 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2763 2764 if (ops->ndo_do_ioctl) { 2765 mm_segment_t oldfs = get_fs(); 2766 2767 set_fs(KERNEL_DS); 2768 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2769 set_fs(oldfs); 2770 } else 2771 err = -EOPNOTSUPP; 2772 2773 if (err == 0) { 2774 err = -ENOBUFS; 2775 dev = __dev_get_by_name(net, p.name); 2776 if (!dev) 2777 goto err_exit; 2778 err = dev_open(dev); 2779 } 2780 } 2781 #endif 2782 2783 err_exit: 2784 rtnl_unlock(); 2785 return err; 2786 } 2787 2788 static int ipv6_mc_config(struct sock *sk, bool join, 2789 const struct in6_addr *addr, int ifindex) 2790 { 2791 int ret; 2792 2793 ASSERT_RTNL(); 2794 2795 lock_sock(sk); 2796 if (join) 2797 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2798 else 2799 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2800 release_sock(sk); 2801 2802 return ret; 2803 } 2804 2805 /* 2806 * Manual configuration of address on an interface 2807 */ 2808 static int inet6_addr_add(struct net *net, int ifindex, 2809 const struct in6_addr *pfx, 2810 const struct in6_addr *peer_pfx, 2811 unsigned int plen, __u32 ifa_flags, 2812 __u32 prefered_lft, __u32 valid_lft, 2813 struct netlink_ext_ack *extack) 2814 { 2815 struct inet6_ifaddr *ifp; 2816 struct inet6_dev *idev; 2817 struct net_device *dev; 2818 unsigned long timeout; 2819 clock_t expires; 2820 int scope; 2821 u32 flags; 2822 2823 ASSERT_RTNL(); 2824 2825 if (plen > 128) 2826 return -EINVAL; 2827 2828 /* check the lifetime */ 2829 if (!valid_lft || prefered_lft > valid_lft) 2830 return -EINVAL; 2831 2832 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2833 return -EINVAL; 2834 2835 dev = __dev_get_by_index(net, ifindex); 2836 if (!dev) 2837 return -ENODEV; 2838 2839 idev = addrconf_add_dev(dev); 2840 if (IS_ERR(idev)) 2841 return PTR_ERR(idev); 2842 2843 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2844 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2845 true, pfx, ifindex); 2846 2847 if (ret < 0) 2848 return ret; 2849 } 2850 2851 scope = ipv6_addr_scope(pfx); 2852 2853 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2854 if (addrconf_finite_timeout(timeout)) { 2855 expires = jiffies_to_clock_t(timeout * HZ); 2856 valid_lft = timeout; 2857 flags = RTF_EXPIRES; 2858 } else { 2859 expires = 0; 2860 flags = 0; 2861 ifa_flags |= IFA_F_PERMANENT; 2862 } 2863 2864 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2865 if (addrconf_finite_timeout(timeout)) { 2866 if (timeout == 0) 2867 ifa_flags |= IFA_F_DEPRECATED; 2868 prefered_lft = timeout; 2869 } 2870 2871 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2872 valid_lft, prefered_lft, true, extack); 2873 2874 if (!IS_ERR(ifp)) { 2875 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2876 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2877 expires, flags); 2878 } 2879 2880 /* 2881 * Note that section 3.1 of RFC 4429 indicates 2882 * that the Optimistic flag should not be set for 2883 * manually configured addresses 2884 */ 2885 addrconf_dad_start(ifp); 2886 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2887 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2888 true, jiffies); 2889 in6_ifa_put(ifp); 2890 addrconf_verify_rtnl(); 2891 return 0; 2892 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2893 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2894 false, pfx, ifindex); 2895 } 2896 2897 return PTR_ERR(ifp); 2898 } 2899 2900 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2901 const struct in6_addr *pfx, unsigned int plen) 2902 { 2903 struct inet6_ifaddr *ifp; 2904 struct inet6_dev *idev; 2905 struct net_device *dev; 2906 2907 if (plen > 128) 2908 return -EINVAL; 2909 2910 dev = __dev_get_by_index(net, ifindex); 2911 if (!dev) 2912 return -ENODEV; 2913 2914 idev = __in6_dev_get(dev); 2915 if (!idev) 2916 return -ENXIO; 2917 2918 read_lock_bh(&idev->lock); 2919 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2920 if (ifp->prefix_len == plen && 2921 ipv6_addr_equal(pfx, &ifp->addr)) { 2922 in6_ifa_hold(ifp); 2923 read_unlock_bh(&idev->lock); 2924 2925 if (!(ifp->flags & IFA_F_TEMPORARY) && 2926 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2927 manage_tempaddrs(idev, ifp, 0, 0, false, 2928 jiffies); 2929 ipv6_del_addr(ifp); 2930 addrconf_verify_rtnl(); 2931 if (ipv6_addr_is_multicast(pfx)) { 2932 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2933 false, pfx, dev->ifindex); 2934 } 2935 return 0; 2936 } 2937 } 2938 read_unlock_bh(&idev->lock); 2939 return -EADDRNOTAVAIL; 2940 } 2941 2942 2943 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2944 { 2945 struct in6_ifreq ireq; 2946 int err; 2947 2948 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2949 return -EPERM; 2950 2951 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2952 return -EFAULT; 2953 2954 rtnl_lock(); 2955 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2956 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2957 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2958 rtnl_unlock(); 2959 return err; 2960 } 2961 2962 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2963 { 2964 struct in6_ifreq ireq; 2965 int err; 2966 2967 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2968 return -EPERM; 2969 2970 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2971 return -EFAULT; 2972 2973 rtnl_lock(); 2974 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2975 ireq.ifr6_prefixlen); 2976 rtnl_unlock(); 2977 return err; 2978 } 2979 2980 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2981 int plen, int scope) 2982 { 2983 struct inet6_ifaddr *ifp; 2984 2985 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2986 scope, IFA_F_PERMANENT, 2987 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 2988 true, NULL); 2989 if (!IS_ERR(ifp)) { 2990 spin_lock_bh(&ifp->lock); 2991 ifp->flags &= ~IFA_F_TENTATIVE; 2992 spin_unlock_bh(&ifp->lock); 2993 rt_genid_bump_ipv6(dev_net(idev->dev)); 2994 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2995 in6_ifa_put(ifp); 2996 } 2997 } 2998 2999 #if IS_ENABLED(CONFIG_IPV6_SIT) 3000 static void sit_add_v4_addrs(struct inet6_dev *idev) 3001 { 3002 struct in6_addr addr; 3003 struct net_device *dev; 3004 struct net *net = dev_net(idev->dev); 3005 int scope, plen; 3006 u32 pflags = 0; 3007 3008 ASSERT_RTNL(); 3009 3010 memset(&addr, 0, sizeof(struct in6_addr)); 3011 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3012 3013 if (idev->dev->flags&IFF_POINTOPOINT) { 3014 addr.s6_addr32[0] = htonl(0xfe800000); 3015 scope = IFA_LINK; 3016 plen = 64; 3017 } else { 3018 scope = IPV6_ADDR_COMPATv4; 3019 plen = 96; 3020 pflags |= RTF_NONEXTHOP; 3021 } 3022 3023 if (addr.s6_addr32[3]) { 3024 add_addr(idev, &addr, plen, scope); 3025 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3026 return; 3027 } 3028 3029 for_each_netdev(net, dev) { 3030 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3031 if (in_dev && (dev->flags & IFF_UP)) { 3032 struct in_ifaddr *ifa; 3033 3034 int flag = scope; 3035 3036 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3037 3038 addr.s6_addr32[3] = ifa->ifa_local; 3039 3040 if (ifa->ifa_scope == RT_SCOPE_LINK) 3041 continue; 3042 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3043 if (idev->dev->flags&IFF_POINTOPOINT) 3044 continue; 3045 flag |= IFA_HOST; 3046 } 3047 3048 add_addr(idev, &addr, plen, flag); 3049 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3050 pflags); 3051 } 3052 } 3053 } 3054 } 3055 #endif 3056 3057 static void init_loopback(struct net_device *dev) 3058 { 3059 struct inet6_dev *idev; 3060 3061 /* ::1 */ 3062 3063 ASSERT_RTNL(); 3064 3065 idev = ipv6_find_idev(dev); 3066 if (!idev) { 3067 pr_debug("%s: add_dev failed\n", __func__); 3068 return; 3069 } 3070 3071 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3072 } 3073 3074 void addrconf_add_linklocal(struct inet6_dev *idev, 3075 const struct in6_addr *addr, u32 flags) 3076 { 3077 struct inet6_ifaddr *ifp; 3078 u32 addr_flags = flags | IFA_F_PERMANENT; 3079 3080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3081 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3082 idev->cnf.optimistic_dad) && 3083 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3084 addr_flags |= IFA_F_OPTIMISTIC; 3085 #endif 3086 3087 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3088 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3089 if (!IS_ERR(ifp)) { 3090 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3091 addrconf_dad_start(ifp); 3092 in6_ifa_put(ifp); 3093 } 3094 } 3095 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3096 3097 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3098 { 3099 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3100 return true; 3101 3102 if (address.s6_addr32[2] == htonl(0x02005eff) && 3103 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3104 return true; 3105 3106 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3107 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3108 return true; 3109 3110 return false; 3111 } 3112 3113 static int ipv6_generate_stable_address(struct in6_addr *address, 3114 u8 dad_count, 3115 const struct inet6_dev *idev) 3116 { 3117 static DEFINE_SPINLOCK(lock); 3118 static __u32 digest[SHA_DIGEST_WORDS]; 3119 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3120 3121 static union { 3122 char __data[SHA_MESSAGE_BYTES]; 3123 struct { 3124 struct in6_addr secret; 3125 __be32 prefix[2]; 3126 unsigned char hwaddr[MAX_ADDR_LEN]; 3127 u8 dad_count; 3128 } __packed; 3129 } data; 3130 3131 struct in6_addr secret; 3132 struct in6_addr temp; 3133 struct net *net = dev_net(idev->dev); 3134 3135 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3136 3137 if (idev->cnf.stable_secret.initialized) 3138 secret = idev->cnf.stable_secret.secret; 3139 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3140 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3141 else 3142 return -1; 3143 3144 retry: 3145 spin_lock_bh(&lock); 3146 3147 sha_init(digest); 3148 memset(&data, 0, sizeof(data)); 3149 memset(workspace, 0, sizeof(workspace)); 3150 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3151 data.prefix[0] = address->s6_addr32[0]; 3152 data.prefix[1] = address->s6_addr32[1]; 3153 data.secret = secret; 3154 data.dad_count = dad_count; 3155 3156 sha_transform(digest, data.__data, workspace); 3157 3158 temp = *address; 3159 temp.s6_addr32[2] = (__force __be32)digest[0]; 3160 temp.s6_addr32[3] = (__force __be32)digest[1]; 3161 3162 spin_unlock_bh(&lock); 3163 3164 if (ipv6_reserved_interfaceid(temp)) { 3165 dad_count++; 3166 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3167 return -1; 3168 goto retry; 3169 } 3170 3171 *address = temp; 3172 return 0; 3173 } 3174 3175 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3176 { 3177 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3178 3179 if (s->initialized) 3180 return; 3181 s = &idev->cnf.stable_secret; 3182 get_random_bytes(&s->secret, sizeof(s->secret)); 3183 s->initialized = true; 3184 } 3185 3186 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3187 { 3188 struct in6_addr addr; 3189 3190 /* no link local addresses on L3 master devices */ 3191 if (netif_is_l3_master(idev->dev)) 3192 return; 3193 3194 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3195 3196 switch (idev->cnf.addr_gen_mode) { 3197 case IN6_ADDR_GEN_MODE_RANDOM: 3198 ipv6_gen_mode_random_init(idev); 3199 /* fallthrough */ 3200 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3201 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3202 addrconf_add_linklocal(idev, &addr, 3203 IFA_F_STABLE_PRIVACY); 3204 else if (prefix_route) 3205 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3206 break; 3207 case IN6_ADDR_GEN_MODE_EUI64: 3208 /* addrconf_add_linklocal also adds a prefix_route and we 3209 * only need to care about prefix routes if ipv6_generate_eui64 3210 * couldn't generate one. 3211 */ 3212 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3213 addrconf_add_linklocal(idev, &addr, 0); 3214 else if (prefix_route) 3215 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3216 break; 3217 case IN6_ADDR_GEN_MODE_NONE: 3218 default: 3219 /* will not add any link local address */ 3220 break; 3221 } 3222 } 3223 3224 static void addrconf_dev_config(struct net_device *dev) 3225 { 3226 struct inet6_dev *idev; 3227 3228 ASSERT_RTNL(); 3229 3230 if ((dev->type != ARPHRD_ETHER) && 3231 (dev->type != ARPHRD_FDDI) && 3232 (dev->type != ARPHRD_ARCNET) && 3233 (dev->type != ARPHRD_INFINIBAND) && 3234 (dev->type != ARPHRD_IEEE1394) && 3235 (dev->type != ARPHRD_TUNNEL6) && 3236 (dev->type != ARPHRD_6LOWPAN) && 3237 (dev->type != ARPHRD_IP6GRE) && 3238 (dev->type != ARPHRD_IPGRE) && 3239 (dev->type != ARPHRD_TUNNEL) && 3240 (dev->type != ARPHRD_NONE)) { 3241 /* Alas, we support only Ethernet autoconfiguration. */ 3242 return; 3243 } 3244 3245 idev = addrconf_add_dev(dev); 3246 if (IS_ERR(idev)) 3247 return; 3248 3249 /* this device type has no EUI support */ 3250 if (dev->type == ARPHRD_NONE && 3251 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3252 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3253 3254 addrconf_addr_gen(idev, false); 3255 } 3256 3257 #if IS_ENABLED(CONFIG_IPV6_SIT) 3258 static void addrconf_sit_config(struct net_device *dev) 3259 { 3260 struct inet6_dev *idev; 3261 3262 ASSERT_RTNL(); 3263 3264 /* 3265 * Configure the tunnel with one of our IPv4 3266 * addresses... we should configure all of 3267 * our v4 addrs in the tunnel 3268 */ 3269 3270 idev = ipv6_find_idev(dev); 3271 if (!idev) { 3272 pr_debug("%s: add_dev failed\n", __func__); 3273 return; 3274 } 3275 3276 if (dev->priv_flags & IFF_ISATAP) { 3277 addrconf_addr_gen(idev, false); 3278 return; 3279 } 3280 3281 sit_add_v4_addrs(idev); 3282 3283 if (dev->flags&IFF_POINTOPOINT) 3284 addrconf_add_mroute(dev); 3285 } 3286 #endif 3287 3288 #if IS_ENABLED(CONFIG_NET_IPGRE) 3289 static void addrconf_gre_config(struct net_device *dev) 3290 { 3291 struct inet6_dev *idev; 3292 3293 ASSERT_RTNL(); 3294 3295 idev = ipv6_find_idev(dev); 3296 if (!idev) { 3297 pr_debug("%s: add_dev failed\n", __func__); 3298 return; 3299 } 3300 3301 addrconf_addr_gen(idev, true); 3302 if (dev->flags & IFF_POINTOPOINT) 3303 addrconf_add_mroute(dev); 3304 } 3305 #endif 3306 3307 static int fixup_permanent_addr(struct inet6_dev *idev, 3308 struct inet6_ifaddr *ifp) 3309 { 3310 /* !rt6i_node means the host route was removed from the 3311 * FIB, for example, if 'lo' device is taken down. In that 3312 * case regenerate the host route. 3313 */ 3314 if (!ifp->rt || !ifp->rt->rt6i_node) { 3315 struct rt6_info *rt, *prev; 3316 3317 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3318 if (IS_ERR(rt)) 3319 return PTR_ERR(rt); 3320 3321 /* ifp->rt can be accessed outside of rtnl */ 3322 spin_lock(&ifp->lock); 3323 prev = ifp->rt; 3324 ifp->rt = rt; 3325 spin_unlock(&ifp->lock); 3326 3327 ip6_rt_put(prev); 3328 } 3329 3330 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3331 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3332 idev->dev, 0, 0); 3333 } 3334 3335 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3336 addrconf_dad_start(ifp); 3337 3338 return 0; 3339 } 3340 3341 static void addrconf_permanent_addr(struct net_device *dev) 3342 { 3343 struct inet6_ifaddr *ifp, *tmp; 3344 struct inet6_dev *idev; 3345 3346 idev = __in6_dev_get(dev); 3347 if (!idev) 3348 return; 3349 3350 write_lock_bh(&idev->lock); 3351 3352 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3353 if ((ifp->flags & IFA_F_PERMANENT) && 3354 fixup_permanent_addr(idev, ifp) < 0) { 3355 write_unlock_bh(&idev->lock); 3356 in6_ifa_hold(ifp); 3357 ipv6_del_addr(ifp); 3358 write_lock_bh(&idev->lock); 3359 3360 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3361 idev->dev->name, &ifp->addr); 3362 } 3363 } 3364 3365 write_unlock_bh(&idev->lock); 3366 } 3367 3368 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3369 void *ptr) 3370 { 3371 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3372 struct netdev_notifier_changeupper_info *info; 3373 struct inet6_dev *idev = __in6_dev_get(dev); 3374 struct net *net = dev_net(dev); 3375 int run_pending = 0; 3376 int err; 3377 3378 switch (event) { 3379 case NETDEV_REGISTER: 3380 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3381 idev = ipv6_add_dev(dev); 3382 if (IS_ERR(idev)) 3383 return notifier_from_errno(PTR_ERR(idev)); 3384 } 3385 break; 3386 3387 case NETDEV_CHANGEMTU: 3388 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3389 if (dev->mtu < IPV6_MIN_MTU) { 3390 addrconf_ifdown(dev, dev != net->loopback_dev); 3391 break; 3392 } 3393 3394 if (idev) { 3395 rt6_mtu_change(dev, dev->mtu); 3396 idev->cnf.mtu6 = dev->mtu; 3397 break; 3398 } 3399 3400 /* allocate new idev */ 3401 idev = ipv6_add_dev(dev); 3402 if (IS_ERR(idev)) 3403 break; 3404 3405 /* device is still not ready */ 3406 if (!(idev->if_flags & IF_READY)) 3407 break; 3408 3409 run_pending = 1; 3410 3411 /* fall through */ 3412 3413 case NETDEV_UP: 3414 case NETDEV_CHANGE: 3415 if (dev->flags & IFF_SLAVE) 3416 break; 3417 3418 if (idev && idev->cnf.disable_ipv6) 3419 break; 3420 3421 if (event == NETDEV_UP) { 3422 /* restore routes for permanent addresses */ 3423 addrconf_permanent_addr(dev); 3424 3425 if (!addrconf_link_ready(dev)) { 3426 /* device is not ready yet. */ 3427 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3428 dev->name); 3429 break; 3430 } 3431 3432 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3433 idev = ipv6_add_dev(dev); 3434 3435 if (!IS_ERR_OR_NULL(idev)) { 3436 idev->if_flags |= IF_READY; 3437 run_pending = 1; 3438 } 3439 } else if (event == NETDEV_CHANGE) { 3440 if (!addrconf_link_ready(dev)) { 3441 /* device is still not ready. */ 3442 break; 3443 } 3444 3445 if (idev) { 3446 if (idev->if_flags & IF_READY) { 3447 /* device is already configured - 3448 * but resend MLD reports, we might 3449 * have roamed and need to update 3450 * multicast snooping switches 3451 */ 3452 ipv6_mc_up(idev); 3453 break; 3454 } 3455 idev->if_flags |= IF_READY; 3456 } 3457 3458 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3459 dev->name); 3460 3461 run_pending = 1; 3462 } 3463 3464 switch (dev->type) { 3465 #if IS_ENABLED(CONFIG_IPV6_SIT) 3466 case ARPHRD_SIT: 3467 addrconf_sit_config(dev); 3468 break; 3469 #endif 3470 #if IS_ENABLED(CONFIG_NET_IPGRE) 3471 case ARPHRD_IPGRE: 3472 addrconf_gre_config(dev); 3473 break; 3474 #endif 3475 case ARPHRD_LOOPBACK: 3476 init_loopback(dev); 3477 break; 3478 3479 default: 3480 addrconf_dev_config(dev); 3481 break; 3482 } 3483 3484 if (!IS_ERR_OR_NULL(idev)) { 3485 if (run_pending) 3486 addrconf_dad_run(idev); 3487 3488 /* 3489 * If the MTU changed during the interface down, 3490 * when the interface up, the changed MTU must be 3491 * reflected in the idev as well as routers. 3492 */ 3493 if (idev->cnf.mtu6 != dev->mtu && 3494 dev->mtu >= IPV6_MIN_MTU) { 3495 rt6_mtu_change(dev, dev->mtu); 3496 idev->cnf.mtu6 = dev->mtu; 3497 } 3498 idev->tstamp = jiffies; 3499 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3500 3501 /* 3502 * If the changed mtu during down is lower than 3503 * IPV6_MIN_MTU stop IPv6 on this interface. 3504 */ 3505 if (dev->mtu < IPV6_MIN_MTU) 3506 addrconf_ifdown(dev, dev != net->loopback_dev); 3507 } 3508 break; 3509 3510 case NETDEV_DOWN: 3511 case NETDEV_UNREGISTER: 3512 /* 3513 * Remove all addresses from this interface. 3514 */ 3515 addrconf_ifdown(dev, event != NETDEV_DOWN); 3516 break; 3517 3518 case NETDEV_CHANGENAME: 3519 if (idev) { 3520 snmp6_unregister_dev(idev); 3521 addrconf_sysctl_unregister(idev); 3522 err = addrconf_sysctl_register(idev); 3523 if (err) 3524 return notifier_from_errno(err); 3525 err = snmp6_register_dev(idev); 3526 if (err) { 3527 addrconf_sysctl_unregister(idev); 3528 return notifier_from_errno(err); 3529 } 3530 } 3531 break; 3532 3533 case NETDEV_PRE_TYPE_CHANGE: 3534 case NETDEV_POST_TYPE_CHANGE: 3535 if (idev) 3536 addrconf_type_change(dev, event); 3537 break; 3538 3539 case NETDEV_CHANGEUPPER: 3540 info = ptr; 3541 3542 /* flush all routes if dev is linked to or unlinked from 3543 * an L3 master device (e.g., VRF) 3544 */ 3545 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3546 addrconf_ifdown(dev, 0); 3547 } 3548 3549 return NOTIFY_OK; 3550 } 3551 3552 /* 3553 * addrconf module should be notified of a device going up 3554 */ 3555 static struct notifier_block ipv6_dev_notf = { 3556 .notifier_call = addrconf_notify, 3557 .priority = ADDRCONF_NOTIFY_PRIORITY, 3558 }; 3559 3560 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3561 { 3562 struct inet6_dev *idev; 3563 ASSERT_RTNL(); 3564 3565 idev = __in6_dev_get(dev); 3566 3567 if (event == NETDEV_POST_TYPE_CHANGE) 3568 ipv6_mc_remap(idev); 3569 else if (event == NETDEV_PRE_TYPE_CHANGE) 3570 ipv6_mc_unmap(idev); 3571 } 3572 3573 static bool addr_is_local(const struct in6_addr *addr) 3574 { 3575 return ipv6_addr_type(addr) & 3576 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3577 } 3578 3579 static int addrconf_ifdown(struct net_device *dev, int how) 3580 { 3581 struct net *net = dev_net(dev); 3582 struct inet6_dev *idev; 3583 struct inet6_ifaddr *ifa, *tmp; 3584 int _keep_addr; 3585 bool keep_addr; 3586 int state, i; 3587 3588 ASSERT_RTNL(); 3589 3590 rt6_ifdown(net, dev); 3591 neigh_ifdown(&nd_tbl, dev); 3592 3593 idev = __in6_dev_get(dev); 3594 if (!idev) 3595 return -ENODEV; 3596 3597 /* 3598 * Step 1: remove reference to ipv6 device from parent device. 3599 * Do not dev_put! 3600 */ 3601 if (how) { 3602 idev->dead = 1; 3603 3604 /* protected by rtnl_lock */ 3605 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3606 3607 /* Step 1.5: remove snmp6 entry */ 3608 snmp6_unregister_dev(idev); 3609 3610 } 3611 3612 /* aggregate the system setting and interface setting */ 3613 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3614 if (!_keep_addr) 3615 _keep_addr = idev->cnf.keep_addr_on_down; 3616 3617 /* combine the user config with event to determine if permanent 3618 * addresses are to be removed from address hash table 3619 */ 3620 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3621 3622 /* Step 2: clear hash table */ 3623 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3624 struct hlist_head *h = &inet6_addr_lst[i]; 3625 3626 spin_lock_bh(&addrconf_hash_lock); 3627 restart: 3628 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3629 if (ifa->idev == idev) { 3630 addrconf_del_dad_work(ifa); 3631 /* combined flag + permanent flag decide if 3632 * address is retained on a down event 3633 */ 3634 if (!keep_addr || 3635 !(ifa->flags & IFA_F_PERMANENT) || 3636 addr_is_local(&ifa->addr)) { 3637 hlist_del_init_rcu(&ifa->addr_lst); 3638 goto restart; 3639 } 3640 } 3641 } 3642 spin_unlock_bh(&addrconf_hash_lock); 3643 } 3644 3645 write_lock_bh(&idev->lock); 3646 3647 addrconf_del_rs_timer(idev); 3648 3649 /* Step 2: clear flags for stateless addrconf */ 3650 if (!how) 3651 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3652 3653 /* Step 3: clear tempaddr list */ 3654 while (!list_empty(&idev->tempaddr_list)) { 3655 ifa = list_first_entry(&idev->tempaddr_list, 3656 struct inet6_ifaddr, tmp_list); 3657 list_del(&ifa->tmp_list); 3658 write_unlock_bh(&idev->lock); 3659 spin_lock_bh(&ifa->lock); 3660 3661 if (ifa->ifpub) { 3662 in6_ifa_put(ifa->ifpub); 3663 ifa->ifpub = NULL; 3664 } 3665 spin_unlock_bh(&ifa->lock); 3666 in6_ifa_put(ifa); 3667 write_lock_bh(&idev->lock); 3668 } 3669 3670 /* re-combine the user config with event to determine if permanent 3671 * addresses are to be removed from the interface list 3672 */ 3673 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3674 3675 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3676 struct rt6_info *rt = NULL; 3677 bool keep; 3678 3679 addrconf_del_dad_work(ifa); 3680 3681 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3682 !addr_is_local(&ifa->addr); 3683 3684 write_unlock_bh(&idev->lock); 3685 spin_lock_bh(&ifa->lock); 3686 3687 if (keep) { 3688 /* set state to skip the notifier below */ 3689 state = INET6_IFADDR_STATE_DEAD; 3690 ifa->state = INET6_IFADDR_STATE_PREDAD; 3691 if (!(ifa->flags & IFA_F_NODAD)) 3692 ifa->flags |= IFA_F_TENTATIVE; 3693 3694 rt = ifa->rt; 3695 ifa->rt = NULL; 3696 } else { 3697 state = ifa->state; 3698 ifa->state = INET6_IFADDR_STATE_DEAD; 3699 } 3700 3701 spin_unlock_bh(&ifa->lock); 3702 3703 if (rt) 3704 ip6_del_rt(rt); 3705 3706 if (state != INET6_IFADDR_STATE_DEAD) { 3707 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3708 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3709 } else { 3710 if (idev->cnf.forwarding) 3711 addrconf_leave_anycast(ifa); 3712 addrconf_leave_solict(ifa->idev, &ifa->addr); 3713 } 3714 3715 write_lock_bh(&idev->lock); 3716 if (!keep) { 3717 list_del_rcu(&ifa->if_list); 3718 in6_ifa_put(ifa); 3719 } 3720 } 3721 3722 write_unlock_bh(&idev->lock); 3723 3724 /* Step 5: Discard anycast and multicast list */ 3725 if (how) { 3726 ipv6_ac_destroy_dev(idev); 3727 ipv6_mc_destroy_dev(idev); 3728 } else { 3729 ipv6_mc_down(idev); 3730 } 3731 3732 idev->tstamp = jiffies; 3733 3734 /* Last: Shot the device (if unregistered) */ 3735 if (how) { 3736 addrconf_sysctl_unregister(idev); 3737 neigh_parms_release(&nd_tbl, idev->nd_parms); 3738 neigh_ifdown(&nd_tbl, dev); 3739 in6_dev_put(idev); 3740 } 3741 return 0; 3742 } 3743 3744 static void addrconf_rs_timer(unsigned long data) 3745 { 3746 struct inet6_dev *idev = (struct inet6_dev *)data; 3747 struct net_device *dev = idev->dev; 3748 struct in6_addr lladdr; 3749 3750 write_lock(&idev->lock); 3751 if (idev->dead || !(idev->if_flags & IF_READY)) 3752 goto out; 3753 3754 if (!ipv6_accept_ra(idev)) 3755 goto out; 3756 3757 /* Announcement received after solicitation was sent */ 3758 if (idev->if_flags & IF_RA_RCVD) 3759 goto out; 3760 3761 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3762 write_unlock(&idev->lock); 3763 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3764 ndisc_send_rs(dev, &lladdr, 3765 &in6addr_linklocal_allrouters); 3766 else 3767 goto put; 3768 3769 write_lock(&idev->lock); 3770 idev->rs_interval = rfc3315_s14_backoff_update( 3771 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3772 /* The wait after the last probe can be shorter */ 3773 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3774 idev->cnf.rtr_solicits) ? 3775 idev->cnf.rtr_solicit_delay : 3776 idev->rs_interval); 3777 } else { 3778 /* 3779 * Note: we do not support deprecated "all on-link" 3780 * assumption any longer. 3781 */ 3782 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3783 } 3784 3785 out: 3786 write_unlock(&idev->lock); 3787 put: 3788 in6_dev_put(idev); 3789 } 3790 3791 /* 3792 * Duplicate Address Detection 3793 */ 3794 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3795 { 3796 unsigned long rand_num; 3797 struct inet6_dev *idev = ifp->idev; 3798 u64 nonce; 3799 3800 if (ifp->flags & IFA_F_OPTIMISTIC) 3801 rand_num = 0; 3802 else 3803 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3804 3805 nonce = 0; 3806 if (idev->cnf.enhanced_dad || 3807 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3808 do 3809 get_random_bytes(&nonce, 6); 3810 while (nonce == 0); 3811 } 3812 ifp->dad_nonce = nonce; 3813 ifp->dad_probes = idev->cnf.dad_transmits; 3814 addrconf_mod_dad_work(ifp, rand_num); 3815 } 3816 3817 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3818 { 3819 struct inet6_dev *idev = ifp->idev; 3820 struct net_device *dev = idev->dev; 3821 bool bump_id, notify = false; 3822 3823 addrconf_join_solict(dev, &ifp->addr); 3824 3825 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3826 3827 read_lock_bh(&idev->lock); 3828 spin_lock(&ifp->lock); 3829 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3830 goto out; 3831 3832 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3833 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3834 idev->cnf.accept_dad < 1) || 3835 !(ifp->flags&IFA_F_TENTATIVE) || 3836 ifp->flags & IFA_F_NODAD) { 3837 bump_id = ifp->flags & IFA_F_TENTATIVE; 3838 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3839 spin_unlock(&ifp->lock); 3840 read_unlock_bh(&idev->lock); 3841 3842 addrconf_dad_completed(ifp, bump_id); 3843 return; 3844 } 3845 3846 if (!(idev->if_flags & IF_READY)) { 3847 spin_unlock(&ifp->lock); 3848 read_unlock_bh(&idev->lock); 3849 /* 3850 * If the device is not ready: 3851 * - keep it tentative if it is a permanent address. 3852 * - otherwise, kill it. 3853 */ 3854 in6_ifa_hold(ifp); 3855 addrconf_dad_stop(ifp, 0); 3856 return; 3857 } 3858 3859 /* 3860 * Optimistic nodes can start receiving 3861 * Frames right away 3862 */ 3863 if (ifp->flags & IFA_F_OPTIMISTIC) { 3864 ip6_ins_rt(ifp->rt); 3865 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3866 /* Because optimistic nodes can use this address, 3867 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3868 */ 3869 notify = true; 3870 } 3871 } 3872 3873 addrconf_dad_kick(ifp); 3874 out: 3875 spin_unlock(&ifp->lock); 3876 read_unlock_bh(&idev->lock); 3877 if (notify) 3878 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3879 } 3880 3881 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3882 { 3883 bool begin_dad = false; 3884 3885 spin_lock_bh(&ifp->lock); 3886 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3887 ifp->state = INET6_IFADDR_STATE_PREDAD; 3888 begin_dad = true; 3889 } 3890 spin_unlock_bh(&ifp->lock); 3891 3892 if (begin_dad) 3893 addrconf_mod_dad_work(ifp, 0); 3894 } 3895 3896 static void addrconf_dad_work(struct work_struct *w) 3897 { 3898 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3899 struct inet6_ifaddr, 3900 dad_work); 3901 struct inet6_dev *idev = ifp->idev; 3902 bool bump_id, disable_ipv6 = false; 3903 struct in6_addr mcaddr; 3904 3905 enum { 3906 DAD_PROCESS, 3907 DAD_BEGIN, 3908 DAD_ABORT, 3909 } action = DAD_PROCESS; 3910 3911 rtnl_lock(); 3912 3913 spin_lock_bh(&ifp->lock); 3914 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3915 action = DAD_BEGIN; 3916 ifp->state = INET6_IFADDR_STATE_DAD; 3917 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3918 action = DAD_ABORT; 3919 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3920 3921 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3922 idev->cnf.accept_dad > 1) && 3923 !idev->cnf.disable_ipv6 && 3924 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3925 struct in6_addr addr; 3926 3927 addr.s6_addr32[0] = htonl(0xfe800000); 3928 addr.s6_addr32[1] = 0; 3929 3930 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3931 ipv6_addr_equal(&ifp->addr, &addr)) { 3932 /* DAD failed for link-local based on MAC */ 3933 idev->cnf.disable_ipv6 = 1; 3934 3935 pr_info("%s: IPv6 being disabled!\n", 3936 ifp->idev->dev->name); 3937 disable_ipv6 = true; 3938 } 3939 } 3940 } 3941 spin_unlock_bh(&ifp->lock); 3942 3943 if (action == DAD_BEGIN) { 3944 addrconf_dad_begin(ifp); 3945 goto out; 3946 } else if (action == DAD_ABORT) { 3947 in6_ifa_hold(ifp); 3948 addrconf_dad_stop(ifp, 1); 3949 if (disable_ipv6) 3950 addrconf_ifdown(idev->dev, 0); 3951 goto out; 3952 } 3953 3954 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3955 goto out; 3956 3957 write_lock_bh(&idev->lock); 3958 if (idev->dead || !(idev->if_flags & IF_READY)) { 3959 write_unlock_bh(&idev->lock); 3960 goto out; 3961 } 3962 3963 spin_lock(&ifp->lock); 3964 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3965 spin_unlock(&ifp->lock); 3966 write_unlock_bh(&idev->lock); 3967 goto out; 3968 } 3969 3970 if (ifp->dad_probes == 0) { 3971 /* 3972 * DAD was successful 3973 */ 3974 3975 bump_id = ifp->flags & IFA_F_TENTATIVE; 3976 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3977 spin_unlock(&ifp->lock); 3978 write_unlock_bh(&idev->lock); 3979 3980 addrconf_dad_completed(ifp, bump_id); 3981 3982 goto out; 3983 } 3984 3985 ifp->dad_probes--; 3986 addrconf_mod_dad_work(ifp, 3987 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3988 spin_unlock(&ifp->lock); 3989 write_unlock_bh(&idev->lock); 3990 3991 /* send a neighbour solicitation for our addr */ 3992 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3993 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3994 ifp->dad_nonce); 3995 out: 3996 in6_ifa_put(ifp); 3997 rtnl_unlock(); 3998 } 3999 4000 /* ifp->idev must be at least read locked */ 4001 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4002 { 4003 struct inet6_ifaddr *ifpiter; 4004 struct inet6_dev *idev = ifp->idev; 4005 4006 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4007 if (ifpiter->scope > IFA_LINK) 4008 break; 4009 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4010 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4011 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4012 IFA_F_PERMANENT) 4013 return false; 4014 } 4015 return true; 4016 } 4017 4018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4019 { 4020 struct net_device *dev = ifp->idev->dev; 4021 struct in6_addr lladdr; 4022 bool send_rs, send_mld; 4023 4024 addrconf_del_dad_work(ifp); 4025 4026 /* 4027 * Configure the address for reception. Now it is valid. 4028 */ 4029 4030 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4031 4032 /* If added prefix is link local and we are prepared to process 4033 router advertisements, start sending router solicitations. 4034 */ 4035 4036 read_lock_bh(&ifp->idev->lock); 4037 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4038 send_rs = send_mld && 4039 ipv6_accept_ra(ifp->idev) && 4040 ifp->idev->cnf.rtr_solicits != 0 && 4041 (dev->flags&IFF_LOOPBACK) == 0; 4042 read_unlock_bh(&ifp->idev->lock); 4043 4044 /* While dad is in progress mld report's source address is in6_addrany. 4045 * Resend with proper ll now. 4046 */ 4047 if (send_mld) 4048 ipv6_mc_dad_complete(ifp->idev); 4049 4050 if (send_rs) { 4051 /* 4052 * If a host as already performed a random delay 4053 * [...] as part of DAD [...] there is no need 4054 * to delay again before sending the first RS 4055 */ 4056 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4057 return; 4058 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4059 4060 write_lock_bh(&ifp->idev->lock); 4061 spin_lock(&ifp->lock); 4062 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4063 ifp->idev->cnf.rtr_solicit_interval); 4064 ifp->idev->rs_probes = 1; 4065 ifp->idev->if_flags |= IF_RS_SENT; 4066 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4067 spin_unlock(&ifp->lock); 4068 write_unlock_bh(&ifp->idev->lock); 4069 } 4070 4071 if (bump_id) 4072 rt_genid_bump_ipv6(dev_net(dev)); 4073 4074 /* Make sure that a new temporary address will be created 4075 * before this temporary address becomes deprecated. 4076 */ 4077 if (ifp->flags & IFA_F_TEMPORARY) 4078 addrconf_verify_rtnl(); 4079 } 4080 4081 static void addrconf_dad_run(struct inet6_dev *idev) 4082 { 4083 struct inet6_ifaddr *ifp; 4084 4085 read_lock_bh(&idev->lock); 4086 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4087 spin_lock(&ifp->lock); 4088 if (ifp->flags & IFA_F_TENTATIVE && 4089 ifp->state == INET6_IFADDR_STATE_DAD) 4090 addrconf_dad_kick(ifp); 4091 spin_unlock(&ifp->lock); 4092 } 4093 read_unlock_bh(&idev->lock); 4094 } 4095 4096 #ifdef CONFIG_PROC_FS 4097 struct if6_iter_state { 4098 struct seq_net_private p; 4099 int bucket; 4100 int offset; 4101 }; 4102 4103 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4104 { 4105 struct if6_iter_state *state = seq->private; 4106 struct net *net = seq_file_net(seq); 4107 struct inet6_ifaddr *ifa = NULL; 4108 int p = 0; 4109 4110 /* initial bucket if pos is 0 */ 4111 if (pos == 0) { 4112 state->bucket = 0; 4113 state->offset = 0; 4114 } 4115 4116 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4117 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4118 addr_lst) { 4119 if (!net_eq(dev_net(ifa->idev->dev), net)) 4120 continue; 4121 /* sync with offset */ 4122 if (p < state->offset) { 4123 p++; 4124 continue; 4125 } 4126 state->offset++; 4127 return ifa; 4128 } 4129 4130 /* prepare for next bucket */ 4131 state->offset = 0; 4132 p = 0; 4133 } 4134 return NULL; 4135 } 4136 4137 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4138 struct inet6_ifaddr *ifa) 4139 { 4140 struct if6_iter_state *state = seq->private; 4141 struct net *net = seq_file_net(seq); 4142 4143 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4144 if (!net_eq(dev_net(ifa->idev->dev), net)) 4145 continue; 4146 state->offset++; 4147 return ifa; 4148 } 4149 4150 while (++state->bucket < IN6_ADDR_HSIZE) { 4151 state->offset = 0; 4152 hlist_for_each_entry_rcu(ifa, 4153 &inet6_addr_lst[state->bucket], addr_lst) { 4154 if (!net_eq(dev_net(ifa->idev->dev), net)) 4155 continue; 4156 state->offset++; 4157 return ifa; 4158 } 4159 } 4160 4161 return NULL; 4162 } 4163 4164 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4165 __acquires(rcu) 4166 { 4167 rcu_read_lock(); 4168 return if6_get_first(seq, *pos); 4169 } 4170 4171 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4172 { 4173 struct inet6_ifaddr *ifa; 4174 4175 ifa = if6_get_next(seq, v); 4176 ++*pos; 4177 return ifa; 4178 } 4179 4180 static void if6_seq_stop(struct seq_file *seq, void *v) 4181 __releases(rcu) 4182 { 4183 rcu_read_unlock(); 4184 } 4185 4186 static int if6_seq_show(struct seq_file *seq, void *v) 4187 { 4188 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4189 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4190 &ifp->addr, 4191 ifp->idev->dev->ifindex, 4192 ifp->prefix_len, 4193 ifp->scope, 4194 (u8) ifp->flags, 4195 ifp->idev->dev->name); 4196 return 0; 4197 } 4198 4199 static const struct seq_operations if6_seq_ops = { 4200 .start = if6_seq_start, 4201 .next = if6_seq_next, 4202 .show = if6_seq_show, 4203 .stop = if6_seq_stop, 4204 }; 4205 4206 static int if6_seq_open(struct inode *inode, struct file *file) 4207 { 4208 return seq_open_net(inode, file, &if6_seq_ops, 4209 sizeof(struct if6_iter_state)); 4210 } 4211 4212 static const struct file_operations if6_fops = { 4213 .owner = THIS_MODULE, 4214 .open = if6_seq_open, 4215 .read = seq_read, 4216 .llseek = seq_lseek, 4217 .release = seq_release_net, 4218 }; 4219 4220 static int __net_init if6_proc_net_init(struct net *net) 4221 { 4222 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4223 return -ENOMEM; 4224 return 0; 4225 } 4226 4227 static void __net_exit if6_proc_net_exit(struct net *net) 4228 { 4229 remove_proc_entry("if_inet6", net->proc_net); 4230 } 4231 4232 static struct pernet_operations if6_proc_net_ops = { 4233 .init = if6_proc_net_init, 4234 .exit = if6_proc_net_exit, 4235 }; 4236 4237 int __init if6_proc_init(void) 4238 { 4239 return register_pernet_subsys(&if6_proc_net_ops); 4240 } 4241 4242 void if6_proc_exit(void) 4243 { 4244 unregister_pernet_subsys(&if6_proc_net_ops); 4245 } 4246 #endif /* CONFIG_PROC_FS */ 4247 4248 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4249 /* Check if address is a home address configured on any interface. */ 4250 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4251 { 4252 unsigned int hash = inet6_addr_hash(net, addr); 4253 struct inet6_ifaddr *ifp = NULL; 4254 int ret = 0; 4255 4256 rcu_read_lock(); 4257 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4258 if (!net_eq(dev_net(ifp->idev->dev), net)) 4259 continue; 4260 if (ipv6_addr_equal(&ifp->addr, addr) && 4261 (ifp->flags & IFA_F_HOMEADDRESS)) { 4262 ret = 1; 4263 break; 4264 } 4265 } 4266 rcu_read_unlock(); 4267 return ret; 4268 } 4269 #endif 4270 4271 /* 4272 * Periodic address status verification 4273 */ 4274 4275 static void addrconf_verify_rtnl(void) 4276 { 4277 unsigned long now, next, next_sec, next_sched; 4278 struct inet6_ifaddr *ifp; 4279 int i; 4280 4281 ASSERT_RTNL(); 4282 4283 rcu_read_lock_bh(); 4284 now = jiffies; 4285 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4286 4287 cancel_delayed_work(&addr_chk_work); 4288 4289 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4290 restart: 4291 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4292 unsigned long age; 4293 4294 /* When setting preferred_lft to a value not zero or 4295 * infinity, while valid_lft is infinity 4296 * IFA_F_PERMANENT has a non-infinity life time. 4297 */ 4298 if ((ifp->flags & IFA_F_PERMANENT) && 4299 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4300 continue; 4301 4302 spin_lock(&ifp->lock); 4303 /* We try to batch several events at once. */ 4304 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4305 4306 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4307 age >= ifp->valid_lft) { 4308 spin_unlock(&ifp->lock); 4309 in6_ifa_hold(ifp); 4310 ipv6_del_addr(ifp); 4311 goto restart; 4312 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4313 spin_unlock(&ifp->lock); 4314 continue; 4315 } else if (age >= ifp->prefered_lft) { 4316 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4317 int deprecate = 0; 4318 4319 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4320 deprecate = 1; 4321 ifp->flags |= IFA_F_DEPRECATED; 4322 } 4323 4324 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4325 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4326 next = ifp->tstamp + ifp->valid_lft * HZ; 4327 4328 spin_unlock(&ifp->lock); 4329 4330 if (deprecate) { 4331 in6_ifa_hold(ifp); 4332 4333 ipv6_ifa_notify(0, ifp); 4334 in6_ifa_put(ifp); 4335 goto restart; 4336 } 4337 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4338 !(ifp->flags&IFA_F_TENTATIVE)) { 4339 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4340 ifp->idev->cnf.dad_transmits * 4341 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4342 4343 if (age >= ifp->prefered_lft - regen_advance) { 4344 struct inet6_ifaddr *ifpub = ifp->ifpub; 4345 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4346 next = ifp->tstamp + ifp->prefered_lft * HZ; 4347 if (!ifp->regen_count && ifpub) { 4348 ifp->regen_count++; 4349 in6_ifa_hold(ifp); 4350 in6_ifa_hold(ifpub); 4351 spin_unlock(&ifp->lock); 4352 4353 spin_lock(&ifpub->lock); 4354 ifpub->regen_count = 0; 4355 spin_unlock(&ifpub->lock); 4356 ipv6_create_tempaddr(ifpub, ifp, true); 4357 in6_ifa_put(ifpub); 4358 in6_ifa_put(ifp); 4359 goto restart; 4360 } 4361 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4362 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4363 spin_unlock(&ifp->lock); 4364 } else { 4365 /* ifp->prefered_lft <= ifp->valid_lft */ 4366 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4367 next = ifp->tstamp + ifp->prefered_lft * HZ; 4368 spin_unlock(&ifp->lock); 4369 } 4370 } 4371 } 4372 4373 next_sec = round_jiffies_up(next); 4374 next_sched = next; 4375 4376 /* If rounded timeout is accurate enough, accept it. */ 4377 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4378 next_sched = next_sec; 4379 4380 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4381 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4382 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4383 4384 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4385 now, next, next_sec, next_sched); 4386 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4387 rcu_read_unlock_bh(); 4388 } 4389 4390 static void addrconf_verify_work(struct work_struct *w) 4391 { 4392 rtnl_lock(); 4393 addrconf_verify_rtnl(); 4394 rtnl_unlock(); 4395 } 4396 4397 static void addrconf_verify(void) 4398 { 4399 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4400 } 4401 4402 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4403 struct in6_addr **peer_pfx) 4404 { 4405 struct in6_addr *pfx = NULL; 4406 4407 *peer_pfx = NULL; 4408 4409 if (addr) 4410 pfx = nla_data(addr); 4411 4412 if (local) { 4413 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4414 *peer_pfx = pfx; 4415 pfx = nla_data(local); 4416 } 4417 4418 return pfx; 4419 } 4420 4421 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4422 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4423 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4424 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4425 [IFA_FLAGS] = { .len = sizeof(u32) }, 4426 }; 4427 4428 static int 4429 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4430 struct netlink_ext_ack *extack) 4431 { 4432 struct net *net = sock_net(skb->sk); 4433 struct ifaddrmsg *ifm; 4434 struct nlattr *tb[IFA_MAX+1]; 4435 struct in6_addr *pfx, *peer_pfx; 4436 u32 ifa_flags; 4437 int err; 4438 4439 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4440 extack); 4441 if (err < 0) 4442 return err; 4443 4444 ifm = nlmsg_data(nlh); 4445 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4446 if (!pfx) 4447 return -EINVAL; 4448 4449 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4450 4451 /* We ignore other flags so far. */ 4452 ifa_flags &= IFA_F_MANAGETEMPADDR; 4453 4454 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4455 ifm->ifa_prefixlen); 4456 } 4457 4458 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4459 u32 prefered_lft, u32 valid_lft) 4460 { 4461 u32 flags; 4462 clock_t expires; 4463 unsigned long timeout; 4464 bool was_managetempaddr; 4465 bool had_prefixroute; 4466 4467 ASSERT_RTNL(); 4468 4469 if (!valid_lft || (prefered_lft > valid_lft)) 4470 return -EINVAL; 4471 4472 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4473 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4474 return -EINVAL; 4475 4476 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4477 if (addrconf_finite_timeout(timeout)) { 4478 expires = jiffies_to_clock_t(timeout * HZ); 4479 valid_lft = timeout; 4480 flags = RTF_EXPIRES; 4481 } else { 4482 expires = 0; 4483 flags = 0; 4484 ifa_flags |= IFA_F_PERMANENT; 4485 } 4486 4487 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4488 if (addrconf_finite_timeout(timeout)) { 4489 if (timeout == 0) 4490 ifa_flags |= IFA_F_DEPRECATED; 4491 prefered_lft = timeout; 4492 } 4493 4494 spin_lock_bh(&ifp->lock); 4495 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4496 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4497 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4498 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4499 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4500 IFA_F_NOPREFIXROUTE); 4501 ifp->flags |= ifa_flags; 4502 ifp->tstamp = jiffies; 4503 ifp->valid_lft = valid_lft; 4504 ifp->prefered_lft = prefered_lft; 4505 4506 spin_unlock_bh(&ifp->lock); 4507 if (!(ifp->flags&IFA_F_TENTATIVE)) 4508 ipv6_ifa_notify(0, ifp); 4509 4510 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4511 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4512 expires, flags); 4513 } else if (had_prefixroute) { 4514 enum cleanup_prefix_rt_t action; 4515 unsigned long rt_expires; 4516 4517 write_lock_bh(&ifp->idev->lock); 4518 action = check_cleanup_prefix_route(ifp, &rt_expires); 4519 write_unlock_bh(&ifp->idev->lock); 4520 4521 if (action != CLEANUP_PREFIX_RT_NOP) { 4522 cleanup_prefix_route(ifp, rt_expires, 4523 action == CLEANUP_PREFIX_RT_DEL); 4524 } 4525 } 4526 4527 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4528 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4529 valid_lft = prefered_lft = 0; 4530 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4531 !was_managetempaddr, jiffies); 4532 } 4533 4534 addrconf_verify_rtnl(); 4535 4536 return 0; 4537 } 4538 4539 static int 4540 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4541 struct netlink_ext_ack *extack) 4542 { 4543 struct net *net = sock_net(skb->sk); 4544 struct ifaddrmsg *ifm; 4545 struct nlattr *tb[IFA_MAX+1]; 4546 struct in6_addr *pfx, *peer_pfx; 4547 struct inet6_ifaddr *ifa; 4548 struct net_device *dev; 4549 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4550 u32 ifa_flags; 4551 int err; 4552 4553 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4554 extack); 4555 if (err < 0) 4556 return err; 4557 4558 ifm = nlmsg_data(nlh); 4559 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4560 if (!pfx) 4561 return -EINVAL; 4562 4563 if (tb[IFA_CACHEINFO]) { 4564 struct ifa_cacheinfo *ci; 4565 4566 ci = nla_data(tb[IFA_CACHEINFO]); 4567 valid_lft = ci->ifa_valid; 4568 preferred_lft = ci->ifa_prefered; 4569 } else { 4570 preferred_lft = INFINITY_LIFE_TIME; 4571 valid_lft = INFINITY_LIFE_TIME; 4572 } 4573 4574 dev = __dev_get_by_index(net, ifm->ifa_index); 4575 if (!dev) 4576 return -ENODEV; 4577 4578 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4579 4580 /* We ignore other flags so far. */ 4581 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4582 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4583 4584 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4585 if (!ifa) { 4586 /* 4587 * It would be best to check for !NLM_F_CREATE here but 4588 * userspace already relies on not having to provide this. 4589 */ 4590 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4591 ifm->ifa_prefixlen, ifa_flags, 4592 preferred_lft, valid_lft, extack); 4593 } 4594 4595 if (nlh->nlmsg_flags & NLM_F_EXCL || 4596 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4597 err = -EEXIST; 4598 else 4599 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4600 4601 in6_ifa_put(ifa); 4602 4603 return err; 4604 } 4605 4606 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4607 u8 scope, int ifindex) 4608 { 4609 struct ifaddrmsg *ifm; 4610 4611 ifm = nlmsg_data(nlh); 4612 ifm->ifa_family = AF_INET6; 4613 ifm->ifa_prefixlen = prefixlen; 4614 ifm->ifa_flags = flags; 4615 ifm->ifa_scope = scope; 4616 ifm->ifa_index = ifindex; 4617 } 4618 4619 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4620 unsigned long tstamp, u32 preferred, u32 valid) 4621 { 4622 struct ifa_cacheinfo ci; 4623 4624 ci.cstamp = cstamp_delta(cstamp); 4625 ci.tstamp = cstamp_delta(tstamp); 4626 ci.ifa_prefered = preferred; 4627 ci.ifa_valid = valid; 4628 4629 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4630 } 4631 4632 static inline int rt_scope(int ifa_scope) 4633 { 4634 if (ifa_scope & IFA_HOST) 4635 return RT_SCOPE_HOST; 4636 else if (ifa_scope & IFA_LINK) 4637 return RT_SCOPE_LINK; 4638 else if (ifa_scope & IFA_SITE) 4639 return RT_SCOPE_SITE; 4640 else 4641 return RT_SCOPE_UNIVERSE; 4642 } 4643 4644 static inline int inet6_ifaddr_msgsize(void) 4645 { 4646 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4647 + nla_total_size(16) /* IFA_LOCAL */ 4648 + nla_total_size(16) /* IFA_ADDRESS */ 4649 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4650 + nla_total_size(4) /* IFA_FLAGS */; 4651 } 4652 4653 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4654 u32 portid, u32 seq, int event, unsigned int flags) 4655 { 4656 struct nlmsghdr *nlh; 4657 u32 preferred, valid; 4658 4659 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4660 if (!nlh) 4661 return -EMSGSIZE; 4662 4663 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4664 ifa->idev->dev->ifindex); 4665 4666 if (!((ifa->flags&IFA_F_PERMANENT) && 4667 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4668 preferred = ifa->prefered_lft; 4669 valid = ifa->valid_lft; 4670 if (preferred != INFINITY_LIFE_TIME) { 4671 long tval = (jiffies - ifa->tstamp)/HZ; 4672 if (preferred > tval) 4673 preferred -= tval; 4674 else 4675 preferred = 0; 4676 if (valid != INFINITY_LIFE_TIME) { 4677 if (valid > tval) 4678 valid -= tval; 4679 else 4680 valid = 0; 4681 } 4682 } 4683 } else { 4684 preferred = INFINITY_LIFE_TIME; 4685 valid = INFINITY_LIFE_TIME; 4686 } 4687 4688 if (!ipv6_addr_any(&ifa->peer_addr)) { 4689 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4690 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4691 goto error; 4692 } else 4693 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4694 goto error; 4695 4696 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4697 goto error; 4698 4699 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4700 goto error; 4701 4702 nlmsg_end(skb, nlh); 4703 return 0; 4704 4705 error: 4706 nlmsg_cancel(skb, nlh); 4707 return -EMSGSIZE; 4708 } 4709 4710 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4711 u32 portid, u32 seq, int event, u16 flags) 4712 { 4713 struct nlmsghdr *nlh; 4714 u8 scope = RT_SCOPE_UNIVERSE; 4715 int ifindex = ifmca->idev->dev->ifindex; 4716 4717 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4718 scope = RT_SCOPE_SITE; 4719 4720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4721 if (!nlh) 4722 return -EMSGSIZE; 4723 4724 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4725 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4726 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4727 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4728 nlmsg_cancel(skb, nlh); 4729 return -EMSGSIZE; 4730 } 4731 4732 nlmsg_end(skb, nlh); 4733 return 0; 4734 } 4735 4736 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4737 u32 portid, u32 seq, int event, unsigned int flags) 4738 { 4739 struct nlmsghdr *nlh; 4740 u8 scope = RT_SCOPE_UNIVERSE; 4741 int ifindex = ifaca->aca_idev->dev->ifindex; 4742 4743 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4744 scope = RT_SCOPE_SITE; 4745 4746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4747 if (!nlh) 4748 return -EMSGSIZE; 4749 4750 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4751 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4752 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4753 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4754 nlmsg_cancel(skb, nlh); 4755 return -EMSGSIZE; 4756 } 4757 4758 nlmsg_end(skb, nlh); 4759 return 0; 4760 } 4761 4762 enum addr_type_t { 4763 UNICAST_ADDR, 4764 MULTICAST_ADDR, 4765 ANYCAST_ADDR, 4766 }; 4767 4768 /* called with rcu_read_lock() */ 4769 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4770 struct netlink_callback *cb, enum addr_type_t type, 4771 int s_ip_idx, int *p_ip_idx) 4772 { 4773 struct ifmcaddr6 *ifmca; 4774 struct ifacaddr6 *ifaca; 4775 int err = 1; 4776 int ip_idx = *p_ip_idx; 4777 4778 read_lock_bh(&idev->lock); 4779 switch (type) { 4780 case UNICAST_ADDR: { 4781 struct inet6_ifaddr *ifa; 4782 4783 /* unicast address incl. temp addr */ 4784 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4785 if (++ip_idx < s_ip_idx) 4786 continue; 4787 err = inet6_fill_ifaddr(skb, ifa, 4788 NETLINK_CB(cb->skb).portid, 4789 cb->nlh->nlmsg_seq, 4790 RTM_NEWADDR, 4791 NLM_F_MULTI); 4792 if (err < 0) 4793 break; 4794 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4795 } 4796 break; 4797 } 4798 case MULTICAST_ADDR: 4799 /* multicast address */ 4800 for (ifmca = idev->mc_list; ifmca; 4801 ifmca = ifmca->next, ip_idx++) { 4802 if (ip_idx < s_ip_idx) 4803 continue; 4804 err = inet6_fill_ifmcaddr(skb, ifmca, 4805 NETLINK_CB(cb->skb).portid, 4806 cb->nlh->nlmsg_seq, 4807 RTM_GETMULTICAST, 4808 NLM_F_MULTI); 4809 if (err < 0) 4810 break; 4811 } 4812 break; 4813 case ANYCAST_ADDR: 4814 /* anycast address */ 4815 for (ifaca = idev->ac_list; ifaca; 4816 ifaca = ifaca->aca_next, ip_idx++) { 4817 if (ip_idx < s_ip_idx) 4818 continue; 4819 err = inet6_fill_ifacaddr(skb, ifaca, 4820 NETLINK_CB(cb->skb).portid, 4821 cb->nlh->nlmsg_seq, 4822 RTM_GETANYCAST, 4823 NLM_F_MULTI); 4824 if (err < 0) 4825 break; 4826 } 4827 break; 4828 default: 4829 break; 4830 } 4831 read_unlock_bh(&idev->lock); 4832 *p_ip_idx = ip_idx; 4833 return err; 4834 } 4835 4836 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4837 enum addr_type_t type) 4838 { 4839 struct net *net = sock_net(skb->sk); 4840 int h, s_h; 4841 int idx, ip_idx; 4842 int s_idx, s_ip_idx; 4843 struct net_device *dev; 4844 struct inet6_dev *idev; 4845 struct hlist_head *head; 4846 4847 s_h = cb->args[0]; 4848 s_idx = idx = cb->args[1]; 4849 s_ip_idx = ip_idx = cb->args[2]; 4850 4851 rcu_read_lock(); 4852 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4853 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4854 idx = 0; 4855 head = &net->dev_index_head[h]; 4856 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4857 if (idx < s_idx) 4858 goto cont; 4859 if (h > s_h || idx > s_idx) 4860 s_ip_idx = 0; 4861 ip_idx = 0; 4862 idev = __in6_dev_get(dev); 4863 if (!idev) 4864 goto cont; 4865 4866 if (in6_dump_addrs(idev, skb, cb, type, 4867 s_ip_idx, &ip_idx) < 0) 4868 goto done; 4869 cont: 4870 idx++; 4871 } 4872 } 4873 done: 4874 rcu_read_unlock(); 4875 cb->args[0] = h; 4876 cb->args[1] = idx; 4877 cb->args[2] = ip_idx; 4878 4879 return skb->len; 4880 } 4881 4882 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4883 { 4884 enum addr_type_t type = UNICAST_ADDR; 4885 4886 return inet6_dump_addr(skb, cb, type); 4887 } 4888 4889 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4890 { 4891 enum addr_type_t type = MULTICAST_ADDR; 4892 4893 return inet6_dump_addr(skb, cb, type); 4894 } 4895 4896 4897 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4898 { 4899 enum addr_type_t type = ANYCAST_ADDR; 4900 4901 return inet6_dump_addr(skb, cb, type); 4902 } 4903 4904 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4905 struct netlink_ext_ack *extack) 4906 { 4907 struct net *net = sock_net(in_skb->sk); 4908 struct ifaddrmsg *ifm; 4909 struct nlattr *tb[IFA_MAX+1]; 4910 struct in6_addr *addr = NULL, *peer; 4911 struct net_device *dev = NULL; 4912 struct inet6_ifaddr *ifa; 4913 struct sk_buff *skb; 4914 int err; 4915 4916 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4917 extack); 4918 if (err < 0) 4919 return err; 4920 4921 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4922 if (!addr) 4923 return -EINVAL; 4924 4925 ifm = nlmsg_data(nlh); 4926 if (ifm->ifa_index) 4927 dev = dev_get_by_index(net, ifm->ifa_index); 4928 4929 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4930 if (!ifa) { 4931 err = -EADDRNOTAVAIL; 4932 goto errout; 4933 } 4934 4935 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4936 if (!skb) { 4937 err = -ENOBUFS; 4938 goto errout_ifa; 4939 } 4940 4941 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4942 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4943 if (err < 0) { 4944 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4945 WARN_ON(err == -EMSGSIZE); 4946 kfree_skb(skb); 4947 goto errout_ifa; 4948 } 4949 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4950 errout_ifa: 4951 in6_ifa_put(ifa); 4952 errout: 4953 if (dev) 4954 dev_put(dev); 4955 return err; 4956 } 4957 4958 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4959 { 4960 struct sk_buff *skb; 4961 struct net *net = dev_net(ifa->idev->dev); 4962 int err = -ENOBUFS; 4963 4964 /* Don't send DELADDR notification for TENTATIVE address, 4965 * since NEWADDR notification is sent only after removing 4966 * TENTATIVE flag, if DAD has not failed. 4967 */ 4968 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4969 event == RTM_DELADDR) 4970 return; 4971 4972 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4973 if (!skb) 4974 goto errout; 4975 4976 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4977 if (err < 0) { 4978 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4979 WARN_ON(err == -EMSGSIZE); 4980 kfree_skb(skb); 4981 goto errout; 4982 } 4983 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4984 return; 4985 errout: 4986 if (err < 0) 4987 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4988 } 4989 4990 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4991 __s32 *array, int bytes) 4992 { 4993 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4994 4995 memset(array, 0, bytes); 4996 array[DEVCONF_FORWARDING] = cnf->forwarding; 4997 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4998 array[DEVCONF_MTU6] = cnf->mtu6; 4999 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5000 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5001 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5002 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5003 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5004 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5005 jiffies_to_msecs(cnf->rtr_solicit_interval); 5006 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5007 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5008 array[DEVCONF_RTR_SOLICIT_DELAY] = 5009 jiffies_to_msecs(cnf->rtr_solicit_delay); 5010 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5011 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5012 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5013 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5014 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5015 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5016 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5017 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5018 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5019 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5020 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5021 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5022 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5023 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5024 #ifdef CONFIG_IPV6_ROUTER_PREF 5025 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5026 array[DEVCONF_RTR_PROBE_INTERVAL] = 5027 jiffies_to_msecs(cnf->rtr_probe_interval); 5028 #ifdef CONFIG_IPV6_ROUTE_INFO 5029 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5030 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5031 #endif 5032 #endif 5033 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5034 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5036 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5037 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5038 #endif 5039 #ifdef CONFIG_IPV6_MROUTE 5040 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5041 #endif 5042 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5043 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5044 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5045 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5046 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5047 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5048 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5049 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5050 /* we omit DEVCONF_STABLE_SECRET for now */ 5051 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5052 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5053 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5054 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5055 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5056 #ifdef CONFIG_IPV6_SEG6_HMAC 5057 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5058 #endif 5059 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5060 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5061 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5062 } 5063 5064 static inline size_t inet6_ifla6_size(void) 5065 { 5066 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5067 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5068 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5069 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5070 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5071 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5072 } 5073 5074 static inline size_t inet6_if_nlmsg_size(void) 5075 { 5076 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5077 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5078 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5079 + nla_total_size(4) /* IFLA_MTU */ 5080 + nla_total_size(4) /* IFLA_LINK */ 5081 + nla_total_size(1) /* IFLA_OPERSTATE */ 5082 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5083 } 5084 5085 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5086 int bytes) 5087 { 5088 int i; 5089 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5090 BUG_ON(pad < 0); 5091 5092 /* Use put_unaligned() because stats may not be aligned for u64. */ 5093 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5094 for (i = 1; i < ICMP6_MIB_MAX; i++) 5095 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5096 5097 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5098 } 5099 5100 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5101 int bytes, size_t syncpoff) 5102 { 5103 int i, c; 5104 u64 buff[IPSTATS_MIB_MAX]; 5105 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5106 5107 BUG_ON(pad < 0); 5108 5109 memset(buff, 0, sizeof(buff)); 5110 buff[0] = IPSTATS_MIB_MAX; 5111 5112 for_each_possible_cpu(c) { 5113 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5114 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5115 } 5116 5117 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5118 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5119 } 5120 5121 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5122 int bytes) 5123 { 5124 switch (attrtype) { 5125 case IFLA_INET6_STATS: 5126 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5127 offsetof(struct ipstats_mib, syncp)); 5128 break; 5129 case IFLA_INET6_ICMP6STATS: 5130 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5131 break; 5132 } 5133 } 5134 5135 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5136 u32 ext_filter_mask) 5137 { 5138 struct nlattr *nla; 5139 struct ifla_cacheinfo ci; 5140 5141 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5142 goto nla_put_failure; 5143 ci.max_reasm_len = IPV6_MAXPLEN; 5144 ci.tstamp = cstamp_delta(idev->tstamp); 5145 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5146 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5147 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5148 goto nla_put_failure; 5149 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5150 if (!nla) 5151 goto nla_put_failure; 5152 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5153 5154 /* XXX - MC not implemented */ 5155 5156 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5157 return 0; 5158 5159 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5160 if (!nla) 5161 goto nla_put_failure; 5162 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5163 5164 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5165 if (!nla) 5166 goto nla_put_failure; 5167 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5168 5169 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5170 if (!nla) 5171 goto nla_put_failure; 5172 5173 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5174 goto nla_put_failure; 5175 5176 read_lock_bh(&idev->lock); 5177 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5178 read_unlock_bh(&idev->lock); 5179 5180 return 0; 5181 5182 nla_put_failure: 5183 return -EMSGSIZE; 5184 } 5185 5186 static size_t inet6_get_link_af_size(const struct net_device *dev, 5187 u32 ext_filter_mask) 5188 { 5189 if (!__in6_dev_get(dev)) 5190 return 0; 5191 5192 return inet6_ifla6_size(); 5193 } 5194 5195 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5196 u32 ext_filter_mask) 5197 { 5198 struct inet6_dev *idev = __in6_dev_get(dev); 5199 5200 if (!idev) 5201 return -ENODATA; 5202 5203 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5204 return -EMSGSIZE; 5205 5206 return 0; 5207 } 5208 5209 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5210 { 5211 struct inet6_ifaddr *ifp; 5212 struct net_device *dev = idev->dev; 5213 bool clear_token, update_rs = false; 5214 struct in6_addr ll_addr; 5215 5216 ASSERT_RTNL(); 5217 5218 if (!token) 5219 return -EINVAL; 5220 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5221 return -EINVAL; 5222 if (!ipv6_accept_ra(idev)) 5223 return -EINVAL; 5224 if (idev->cnf.rtr_solicits == 0) 5225 return -EINVAL; 5226 5227 write_lock_bh(&idev->lock); 5228 5229 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5230 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5231 5232 write_unlock_bh(&idev->lock); 5233 5234 clear_token = ipv6_addr_any(token); 5235 if (clear_token) 5236 goto update_lft; 5237 5238 if (!idev->dead && (idev->if_flags & IF_READY) && 5239 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5240 IFA_F_OPTIMISTIC)) { 5241 /* If we're not ready, then normal ifup will take care 5242 * of this. Otherwise, we need to request our rs here. 5243 */ 5244 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5245 update_rs = true; 5246 } 5247 5248 update_lft: 5249 write_lock_bh(&idev->lock); 5250 5251 if (update_rs) { 5252 idev->if_flags |= IF_RS_SENT; 5253 idev->rs_interval = rfc3315_s14_backoff_init( 5254 idev->cnf.rtr_solicit_interval); 5255 idev->rs_probes = 1; 5256 addrconf_mod_rs_timer(idev, idev->rs_interval); 5257 } 5258 5259 /* Well, that's kinda nasty ... */ 5260 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5261 spin_lock(&ifp->lock); 5262 if (ifp->tokenized) { 5263 ifp->valid_lft = 0; 5264 ifp->prefered_lft = 0; 5265 } 5266 spin_unlock(&ifp->lock); 5267 } 5268 5269 write_unlock_bh(&idev->lock); 5270 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5271 addrconf_verify_rtnl(); 5272 return 0; 5273 } 5274 5275 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5276 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5277 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5278 }; 5279 5280 static int inet6_validate_link_af(const struct net_device *dev, 5281 const struct nlattr *nla) 5282 { 5283 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5284 5285 if (dev && !__in6_dev_get(dev)) 5286 return -EAFNOSUPPORT; 5287 5288 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5289 NULL); 5290 } 5291 5292 static int check_addr_gen_mode(int mode) 5293 { 5294 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5295 mode != IN6_ADDR_GEN_MODE_NONE && 5296 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5297 mode != IN6_ADDR_GEN_MODE_RANDOM) 5298 return -EINVAL; 5299 return 1; 5300 } 5301 5302 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5303 int mode) 5304 { 5305 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5306 !idev->cnf.stable_secret.initialized && 5307 !net->ipv6.devconf_dflt->stable_secret.initialized) 5308 return -EINVAL; 5309 return 1; 5310 } 5311 5312 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5313 { 5314 int err = -EINVAL; 5315 struct inet6_dev *idev = __in6_dev_get(dev); 5316 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5317 5318 if (!idev) 5319 return -EAFNOSUPPORT; 5320 5321 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5322 BUG(); 5323 5324 if (tb[IFLA_INET6_TOKEN]) { 5325 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5326 if (err) 5327 return err; 5328 } 5329 5330 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5331 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5332 5333 if (check_addr_gen_mode(mode) < 0 || 5334 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5335 return -EINVAL; 5336 5337 idev->cnf.addr_gen_mode = mode; 5338 err = 0; 5339 } 5340 5341 return err; 5342 } 5343 5344 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5345 u32 portid, u32 seq, int event, unsigned int flags) 5346 { 5347 struct net_device *dev = idev->dev; 5348 struct ifinfomsg *hdr; 5349 struct nlmsghdr *nlh; 5350 void *protoinfo; 5351 5352 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5353 if (!nlh) 5354 return -EMSGSIZE; 5355 5356 hdr = nlmsg_data(nlh); 5357 hdr->ifi_family = AF_INET6; 5358 hdr->__ifi_pad = 0; 5359 hdr->ifi_type = dev->type; 5360 hdr->ifi_index = dev->ifindex; 5361 hdr->ifi_flags = dev_get_flags(dev); 5362 hdr->ifi_change = 0; 5363 5364 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5365 (dev->addr_len && 5366 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5367 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5368 (dev->ifindex != dev_get_iflink(dev) && 5369 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5370 nla_put_u8(skb, IFLA_OPERSTATE, 5371 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5372 goto nla_put_failure; 5373 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5374 if (!protoinfo) 5375 goto nla_put_failure; 5376 5377 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5378 goto nla_put_failure; 5379 5380 nla_nest_end(skb, protoinfo); 5381 nlmsg_end(skb, nlh); 5382 return 0; 5383 5384 nla_put_failure: 5385 nlmsg_cancel(skb, nlh); 5386 return -EMSGSIZE; 5387 } 5388 5389 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5390 { 5391 struct net *net = sock_net(skb->sk); 5392 int h, s_h; 5393 int idx = 0, s_idx; 5394 struct net_device *dev; 5395 struct inet6_dev *idev; 5396 struct hlist_head *head; 5397 5398 s_h = cb->args[0]; 5399 s_idx = cb->args[1]; 5400 5401 rcu_read_lock(); 5402 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5403 idx = 0; 5404 head = &net->dev_index_head[h]; 5405 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5406 if (idx < s_idx) 5407 goto cont; 5408 idev = __in6_dev_get(dev); 5409 if (!idev) 5410 goto cont; 5411 if (inet6_fill_ifinfo(skb, idev, 5412 NETLINK_CB(cb->skb).portid, 5413 cb->nlh->nlmsg_seq, 5414 RTM_NEWLINK, NLM_F_MULTI) < 0) 5415 goto out; 5416 cont: 5417 idx++; 5418 } 5419 } 5420 out: 5421 rcu_read_unlock(); 5422 cb->args[1] = idx; 5423 cb->args[0] = h; 5424 5425 return skb->len; 5426 } 5427 5428 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5429 { 5430 struct sk_buff *skb; 5431 struct net *net = dev_net(idev->dev); 5432 int err = -ENOBUFS; 5433 5434 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5435 if (!skb) 5436 goto errout; 5437 5438 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5439 if (err < 0) { 5440 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5441 WARN_ON(err == -EMSGSIZE); 5442 kfree_skb(skb); 5443 goto errout; 5444 } 5445 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5446 return; 5447 errout: 5448 if (err < 0) 5449 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5450 } 5451 5452 static inline size_t inet6_prefix_nlmsg_size(void) 5453 { 5454 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5455 + nla_total_size(sizeof(struct in6_addr)) 5456 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5457 } 5458 5459 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5460 struct prefix_info *pinfo, u32 portid, u32 seq, 5461 int event, unsigned int flags) 5462 { 5463 struct prefixmsg *pmsg; 5464 struct nlmsghdr *nlh; 5465 struct prefix_cacheinfo ci; 5466 5467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5468 if (!nlh) 5469 return -EMSGSIZE; 5470 5471 pmsg = nlmsg_data(nlh); 5472 pmsg->prefix_family = AF_INET6; 5473 pmsg->prefix_pad1 = 0; 5474 pmsg->prefix_pad2 = 0; 5475 pmsg->prefix_ifindex = idev->dev->ifindex; 5476 pmsg->prefix_len = pinfo->prefix_len; 5477 pmsg->prefix_type = pinfo->type; 5478 pmsg->prefix_pad3 = 0; 5479 pmsg->prefix_flags = 0; 5480 if (pinfo->onlink) 5481 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5482 if (pinfo->autoconf) 5483 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5484 5485 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5486 goto nla_put_failure; 5487 ci.preferred_time = ntohl(pinfo->prefered); 5488 ci.valid_time = ntohl(pinfo->valid); 5489 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5490 goto nla_put_failure; 5491 nlmsg_end(skb, nlh); 5492 return 0; 5493 5494 nla_put_failure: 5495 nlmsg_cancel(skb, nlh); 5496 return -EMSGSIZE; 5497 } 5498 5499 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5500 struct prefix_info *pinfo) 5501 { 5502 struct sk_buff *skb; 5503 struct net *net = dev_net(idev->dev); 5504 int err = -ENOBUFS; 5505 5506 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5507 if (!skb) 5508 goto errout; 5509 5510 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5511 if (err < 0) { 5512 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5513 WARN_ON(err == -EMSGSIZE); 5514 kfree_skb(skb); 5515 goto errout; 5516 } 5517 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5518 return; 5519 errout: 5520 if (err < 0) 5521 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5522 } 5523 5524 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5525 { 5526 struct net *net = dev_net(ifp->idev->dev); 5527 5528 if (event) 5529 ASSERT_RTNL(); 5530 5531 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5532 5533 switch (event) { 5534 case RTM_NEWADDR: 5535 /* 5536 * If the address was optimistic 5537 * we inserted the route at the start of 5538 * our DAD process, so we don't need 5539 * to do it again 5540 */ 5541 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5542 ip6_ins_rt(ifp->rt); 5543 if (ifp->idev->cnf.forwarding) 5544 addrconf_join_anycast(ifp); 5545 if (!ipv6_addr_any(&ifp->peer_addr)) 5546 addrconf_prefix_route(&ifp->peer_addr, 128, 5547 ifp->idev->dev, 0, 0); 5548 break; 5549 case RTM_DELADDR: 5550 if (ifp->idev->cnf.forwarding) 5551 addrconf_leave_anycast(ifp); 5552 addrconf_leave_solict(ifp->idev, &ifp->addr); 5553 if (!ipv6_addr_any(&ifp->peer_addr)) { 5554 struct rt6_info *rt; 5555 5556 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5557 ifp->idev->dev, 0, 0); 5558 if (rt) 5559 ip6_del_rt(rt); 5560 } 5561 if (ifp->rt) { 5562 if (dst_hold_safe(&ifp->rt->dst)) 5563 ip6_del_rt(ifp->rt); 5564 } 5565 rt_genid_bump_ipv6(net); 5566 break; 5567 } 5568 atomic_inc(&net->ipv6.dev_addr_genid); 5569 } 5570 5571 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5572 { 5573 rcu_read_lock_bh(); 5574 if (likely(ifp->idev->dead == 0)) 5575 __ipv6_ifa_notify(event, ifp); 5576 rcu_read_unlock_bh(); 5577 } 5578 5579 #ifdef CONFIG_SYSCTL 5580 5581 static 5582 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5583 void __user *buffer, size_t *lenp, loff_t *ppos) 5584 { 5585 int *valp = ctl->data; 5586 int val = *valp; 5587 loff_t pos = *ppos; 5588 struct ctl_table lctl; 5589 int ret; 5590 5591 /* 5592 * ctl->data points to idev->cnf.forwarding, we should 5593 * not modify it until we get the rtnl lock. 5594 */ 5595 lctl = *ctl; 5596 lctl.data = &val; 5597 5598 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5599 5600 if (write) 5601 ret = addrconf_fixup_forwarding(ctl, valp, val); 5602 if (ret) 5603 *ppos = pos; 5604 return ret; 5605 } 5606 5607 static 5608 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5609 void __user *buffer, size_t *lenp, loff_t *ppos) 5610 { 5611 struct inet6_dev *idev = ctl->extra1; 5612 int min_mtu = IPV6_MIN_MTU; 5613 struct ctl_table lctl; 5614 5615 lctl = *ctl; 5616 lctl.extra1 = &min_mtu; 5617 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5618 5619 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5620 } 5621 5622 static void dev_disable_change(struct inet6_dev *idev) 5623 { 5624 struct netdev_notifier_info info; 5625 5626 if (!idev || !idev->dev) 5627 return; 5628 5629 netdev_notifier_info_init(&info, idev->dev); 5630 if (idev->cnf.disable_ipv6) 5631 addrconf_notify(NULL, NETDEV_DOWN, &info); 5632 else 5633 addrconf_notify(NULL, NETDEV_UP, &info); 5634 } 5635 5636 static void addrconf_disable_change(struct net *net, __s32 newf) 5637 { 5638 struct net_device *dev; 5639 struct inet6_dev *idev; 5640 5641 for_each_netdev(net, dev) { 5642 idev = __in6_dev_get(dev); 5643 if (idev) { 5644 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5645 idev->cnf.disable_ipv6 = newf; 5646 if (changed) 5647 dev_disable_change(idev); 5648 } 5649 } 5650 } 5651 5652 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5653 { 5654 struct net *net; 5655 int old; 5656 5657 if (!rtnl_trylock()) 5658 return restart_syscall(); 5659 5660 net = (struct net *)table->extra2; 5661 old = *p; 5662 *p = newf; 5663 5664 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5665 rtnl_unlock(); 5666 return 0; 5667 } 5668 5669 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5670 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5671 addrconf_disable_change(net, newf); 5672 } else if ((!newf) ^ (!old)) 5673 dev_disable_change((struct inet6_dev *)table->extra1); 5674 5675 rtnl_unlock(); 5676 return 0; 5677 } 5678 5679 static 5680 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5681 void __user *buffer, size_t *lenp, loff_t *ppos) 5682 { 5683 int *valp = ctl->data; 5684 int val = *valp; 5685 loff_t pos = *ppos; 5686 struct ctl_table lctl; 5687 int ret; 5688 5689 /* 5690 * ctl->data points to idev->cnf.disable_ipv6, we should 5691 * not modify it until we get the rtnl lock. 5692 */ 5693 lctl = *ctl; 5694 lctl.data = &val; 5695 5696 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5697 5698 if (write) 5699 ret = addrconf_disable_ipv6(ctl, valp, val); 5700 if (ret) 5701 *ppos = pos; 5702 return ret; 5703 } 5704 5705 static 5706 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5707 void __user *buffer, size_t *lenp, loff_t *ppos) 5708 { 5709 int *valp = ctl->data; 5710 int ret; 5711 int old, new; 5712 5713 old = *valp; 5714 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5715 new = *valp; 5716 5717 if (write && old != new) { 5718 struct net *net = ctl->extra2; 5719 5720 if (!rtnl_trylock()) 5721 return restart_syscall(); 5722 5723 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5724 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5725 NETCONFA_PROXY_NEIGH, 5726 NETCONFA_IFINDEX_DEFAULT, 5727 net->ipv6.devconf_dflt); 5728 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5729 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5730 NETCONFA_PROXY_NEIGH, 5731 NETCONFA_IFINDEX_ALL, 5732 net->ipv6.devconf_all); 5733 else { 5734 struct inet6_dev *idev = ctl->extra1; 5735 5736 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5737 NETCONFA_PROXY_NEIGH, 5738 idev->dev->ifindex, 5739 &idev->cnf); 5740 } 5741 rtnl_unlock(); 5742 } 5743 5744 return ret; 5745 } 5746 5747 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5748 void __user *buffer, size_t *lenp, 5749 loff_t *ppos) 5750 { 5751 int ret = 0; 5752 int new_val; 5753 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5754 struct net *net = (struct net *)ctl->extra2; 5755 5756 if (!rtnl_trylock()) 5757 return restart_syscall(); 5758 5759 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5760 5761 if (write) { 5762 new_val = *((int *)ctl->data); 5763 5764 if (check_addr_gen_mode(new_val) < 0) { 5765 ret = -EINVAL; 5766 goto out; 5767 } 5768 5769 /* request for default */ 5770 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5771 ipv6_devconf_dflt.addr_gen_mode = new_val; 5772 5773 /* request for individual net device */ 5774 } else { 5775 if (!idev) 5776 goto out; 5777 5778 if (check_stable_privacy(idev, net, new_val) < 0) { 5779 ret = -EINVAL; 5780 goto out; 5781 } 5782 5783 if (idev->cnf.addr_gen_mode != new_val) { 5784 idev->cnf.addr_gen_mode = new_val; 5785 addrconf_dev_config(idev->dev); 5786 } 5787 } 5788 } 5789 5790 out: 5791 rtnl_unlock(); 5792 5793 return ret; 5794 } 5795 5796 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5797 void __user *buffer, size_t *lenp, 5798 loff_t *ppos) 5799 { 5800 int err; 5801 struct in6_addr addr; 5802 char str[IPV6_MAX_STRLEN]; 5803 struct ctl_table lctl = *ctl; 5804 struct net *net = ctl->extra2; 5805 struct ipv6_stable_secret *secret = ctl->data; 5806 5807 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5808 return -EIO; 5809 5810 lctl.maxlen = IPV6_MAX_STRLEN; 5811 lctl.data = str; 5812 5813 if (!rtnl_trylock()) 5814 return restart_syscall(); 5815 5816 if (!write && !secret->initialized) { 5817 err = -EIO; 5818 goto out; 5819 } 5820 5821 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5822 if (err >= sizeof(str)) { 5823 err = -EIO; 5824 goto out; 5825 } 5826 5827 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5828 if (err || !write) 5829 goto out; 5830 5831 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5832 err = -EIO; 5833 goto out; 5834 } 5835 5836 secret->initialized = true; 5837 secret->secret = addr; 5838 5839 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5840 struct net_device *dev; 5841 5842 for_each_netdev(net, dev) { 5843 struct inet6_dev *idev = __in6_dev_get(dev); 5844 5845 if (idev) { 5846 idev->cnf.addr_gen_mode = 5847 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5848 } 5849 } 5850 } else { 5851 struct inet6_dev *idev = ctl->extra1; 5852 5853 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5854 } 5855 5856 out: 5857 rtnl_unlock(); 5858 5859 return err; 5860 } 5861 5862 static 5863 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5864 int write, 5865 void __user *buffer, 5866 size_t *lenp, 5867 loff_t *ppos) 5868 { 5869 int *valp = ctl->data; 5870 int val = *valp; 5871 loff_t pos = *ppos; 5872 struct ctl_table lctl; 5873 int ret; 5874 5875 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5876 * we should not modify it until we get the rtnl lock. 5877 */ 5878 lctl = *ctl; 5879 lctl.data = &val; 5880 5881 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5882 5883 if (write) 5884 ret = addrconf_fixup_linkdown(ctl, valp, val); 5885 if (ret) 5886 *ppos = pos; 5887 return ret; 5888 } 5889 5890 static 5891 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5892 { 5893 if (rt) { 5894 if (action) 5895 rt->dst.flags |= DST_NOPOLICY; 5896 else 5897 rt->dst.flags &= ~DST_NOPOLICY; 5898 } 5899 } 5900 5901 static 5902 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5903 { 5904 struct inet6_ifaddr *ifa; 5905 5906 read_lock_bh(&idev->lock); 5907 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5908 spin_lock(&ifa->lock); 5909 if (ifa->rt) { 5910 struct rt6_info *rt = ifa->rt; 5911 int cpu; 5912 5913 rcu_read_lock(); 5914 addrconf_set_nopolicy(ifa->rt, val); 5915 if (rt->rt6i_pcpu) { 5916 for_each_possible_cpu(cpu) { 5917 struct rt6_info **rtp; 5918 5919 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5920 addrconf_set_nopolicy(*rtp, val); 5921 } 5922 } 5923 rcu_read_unlock(); 5924 } 5925 spin_unlock(&ifa->lock); 5926 } 5927 read_unlock_bh(&idev->lock); 5928 } 5929 5930 static 5931 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5932 { 5933 struct inet6_dev *idev; 5934 struct net *net; 5935 5936 if (!rtnl_trylock()) 5937 return restart_syscall(); 5938 5939 *valp = val; 5940 5941 net = (struct net *)ctl->extra2; 5942 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5943 rtnl_unlock(); 5944 return 0; 5945 } 5946 5947 if (valp == &net->ipv6.devconf_all->disable_policy) { 5948 struct net_device *dev; 5949 5950 for_each_netdev(net, dev) { 5951 idev = __in6_dev_get(dev); 5952 if (idev) 5953 addrconf_disable_policy_idev(idev, val); 5954 } 5955 } else { 5956 idev = (struct inet6_dev *)ctl->extra1; 5957 addrconf_disable_policy_idev(idev, val); 5958 } 5959 5960 rtnl_unlock(); 5961 return 0; 5962 } 5963 5964 static 5965 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5966 void __user *buffer, size_t *lenp, 5967 loff_t *ppos) 5968 { 5969 int *valp = ctl->data; 5970 int val = *valp; 5971 loff_t pos = *ppos; 5972 struct ctl_table lctl; 5973 int ret; 5974 5975 lctl = *ctl; 5976 lctl.data = &val; 5977 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5978 5979 if (write && (*valp != val)) 5980 ret = addrconf_disable_policy(ctl, valp, val); 5981 5982 if (ret) 5983 *ppos = pos; 5984 5985 return ret; 5986 } 5987 5988 static int minus_one = -1; 5989 static const int one = 1; 5990 static const int two_five_five = 255; 5991 5992 static const struct ctl_table addrconf_sysctl[] = { 5993 { 5994 .procname = "forwarding", 5995 .data = &ipv6_devconf.forwarding, 5996 .maxlen = sizeof(int), 5997 .mode = 0644, 5998 .proc_handler = addrconf_sysctl_forward, 5999 }, 6000 { 6001 .procname = "hop_limit", 6002 .data = &ipv6_devconf.hop_limit, 6003 .maxlen = sizeof(int), 6004 .mode = 0644, 6005 .proc_handler = proc_dointvec_minmax, 6006 .extra1 = (void *)&one, 6007 .extra2 = (void *)&two_five_five, 6008 }, 6009 { 6010 .procname = "mtu", 6011 .data = &ipv6_devconf.mtu6, 6012 .maxlen = sizeof(int), 6013 .mode = 0644, 6014 .proc_handler = addrconf_sysctl_mtu, 6015 }, 6016 { 6017 .procname = "accept_ra", 6018 .data = &ipv6_devconf.accept_ra, 6019 .maxlen = sizeof(int), 6020 .mode = 0644, 6021 .proc_handler = proc_dointvec, 6022 }, 6023 { 6024 .procname = "accept_redirects", 6025 .data = &ipv6_devconf.accept_redirects, 6026 .maxlen = sizeof(int), 6027 .mode = 0644, 6028 .proc_handler = proc_dointvec, 6029 }, 6030 { 6031 .procname = "autoconf", 6032 .data = &ipv6_devconf.autoconf, 6033 .maxlen = sizeof(int), 6034 .mode = 0644, 6035 .proc_handler = proc_dointvec, 6036 }, 6037 { 6038 .procname = "dad_transmits", 6039 .data = &ipv6_devconf.dad_transmits, 6040 .maxlen = sizeof(int), 6041 .mode = 0644, 6042 .proc_handler = proc_dointvec, 6043 }, 6044 { 6045 .procname = "router_solicitations", 6046 .data = &ipv6_devconf.rtr_solicits, 6047 .maxlen = sizeof(int), 6048 .mode = 0644, 6049 .proc_handler = proc_dointvec_minmax, 6050 .extra1 = &minus_one, 6051 }, 6052 { 6053 .procname = "router_solicitation_interval", 6054 .data = &ipv6_devconf.rtr_solicit_interval, 6055 .maxlen = sizeof(int), 6056 .mode = 0644, 6057 .proc_handler = proc_dointvec_jiffies, 6058 }, 6059 { 6060 .procname = "router_solicitation_max_interval", 6061 .data = &ipv6_devconf.rtr_solicit_max_interval, 6062 .maxlen = sizeof(int), 6063 .mode = 0644, 6064 .proc_handler = proc_dointvec_jiffies, 6065 }, 6066 { 6067 .procname = "router_solicitation_delay", 6068 .data = &ipv6_devconf.rtr_solicit_delay, 6069 .maxlen = sizeof(int), 6070 .mode = 0644, 6071 .proc_handler = proc_dointvec_jiffies, 6072 }, 6073 { 6074 .procname = "force_mld_version", 6075 .data = &ipv6_devconf.force_mld_version, 6076 .maxlen = sizeof(int), 6077 .mode = 0644, 6078 .proc_handler = proc_dointvec, 6079 }, 6080 { 6081 .procname = "mldv1_unsolicited_report_interval", 6082 .data = 6083 &ipv6_devconf.mldv1_unsolicited_report_interval, 6084 .maxlen = sizeof(int), 6085 .mode = 0644, 6086 .proc_handler = proc_dointvec_ms_jiffies, 6087 }, 6088 { 6089 .procname = "mldv2_unsolicited_report_interval", 6090 .data = 6091 &ipv6_devconf.mldv2_unsolicited_report_interval, 6092 .maxlen = sizeof(int), 6093 .mode = 0644, 6094 .proc_handler = proc_dointvec_ms_jiffies, 6095 }, 6096 { 6097 .procname = "use_tempaddr", 6098 .data = &ipv6_devconf.use_tempaddr, 6099 .maxlen = sizeof(int), 6100 .mode = 0644, 6101 .proc_handler = proc_dointvec, 6102 }, 6103 { 6104 .procname = "temp_valid_lft", 6105 .data = &ipv6_devconf.temp_valid_lft, 6106 .maxlen = sizeof(int), 6107 .mode = 0644, 6108 .proc_handler = proc_dointvec, 6109 }, 6110 { 6111 .procname = "temp_prefered_lft", 6112 .data = &ipv6_devconf.temp_prefered_lft, 6113 .maxlen = sizeof(int), 6114 .mode = 0644, 6115 .proc_handler = proc_dointvec, 6116 }, 6117 { 6118 .procname = "regen_max_retry", 6119 .data = &ipv6_devconf.regen_max_retry, 6120 .maxlen = sizeof(int), 6121 .mode = 0644, 6122 .proc_handler = proc_dointvec, 6123 }, 6124 { 6125 .procname = "max_desync_factor", 6126 .data = &ipv6_devconf.max_desync_factor, 6127 .maxlen = sizeof(int), 6128 .mode = 0644, 6129 .proc_handler = proc_dointvec, 6130 }, 6131 { 6132 .procname = "max_addresses", 6133 .data = &ipv6_devconf.max_addresses, 6134 .maxlen = sizeof(int), 6135 .mode = 0644, 6136 .proc_handler = proc_dointvec, 6137 }, 6138 { 6139 .procname = "accept_ra_defrtr", 6140 .data = &ipv6_devconf.accept_ra_defrtr, 6141 .maxlen = sizeof(int), 6142 .mode = 0644, 6143 .proc_handler = proc_dointvec, 6144 }, 6145 { 6146 .procname = "accept_ra_min_hop_limit", 6147 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6148 .maxlen = sizeof(int), 6149 .mode = 0644, 6150 .proc_handler = proc_dointvec, 6151 }, 6152 { 6153 .procname = "accept_ra_pinfo", 6154 .data = &ipv6_devconf.accept_ra_pinfo, 6155 .maxlen = sizeof(int), 6156 .mode = 0644, 6157 .proc_handler = proc_dointvec, 6158 }, 6159 #ifdef CONFIG_IPV6_ROUTER_PREF 6160 { 6161 .procname = "accept_ra_rtr_pref", 6162 .data = &ipv6_devconf.accept_ra_rtr_pref, 6163 .maxlen = sizeof(int), 6164 .mode = 0644, 6165 .proc_handler = proc_dointvec, 6166 }, 6167 { 6168 .procname = "router_probe_interval", 6169 .data = &ipv6_devconf.rtr_probe_interval, 6170 .maxlen = sizeof(int), 6171 .mode = 0644, 6172 .proc_handler = proc_dointvec_jiffies, 6173 }, 6174 #ifdef CONFIG_IPV6_ROUTE_INFO 6175 { 6176 .procname = "accept_ra_rt_info_min_plen", 6177 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6178 .maxlen = sizeof(int), 6179 .mode = 0644, 6180 .proc_handler = proc_dointvec, 6181 }, 6182 { 6183 .procname = "accept_ra_rt_info_max_plen", 6184 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6185 .maxlen = sizeof(int), 6186 .mode = 0644, 6187 .proc_handler = proc_dointvec, 6188 }, 6189 #endif 6190 #endif 6191 { 6192 .procname = "proxy_ndp", 6193 .data = &ipv6_devconf.proxy_ndp, 6194 .maxlen = sizeof(int), 6195 .mode = 0644, 6196 .proc_handler = addrconf_sysctl_proxy_ndp, 6197 }, 6198 { 6199 .procname = "accept_source_route", 6200 .data = &ipv6_devconf.accept_source_route, 6201 .maxlen = sizeof(int), 6202 .mode = 0644, 6203 .proc_handler = proc_dointvec, 6204 }, 6205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6206 { 6207 .procname = "optimistic_dad", 6208 .data = &ipv6_devconf.optimistic_dad, 6209 .maxlen = sizeof(int), 6210 .mode = 0644, 6211 .proc_handler = proc_dointvec, 6212 }, 6213 { 6214 .procname = "use_optimistic", 6215 .data = &ipv6_devconf.use_optimistic, 6216 .maxlen = sizeof(int), 6217 .mode = 0644, 6218 .proc_handler = proc_dointvec, 6219 }, 6220 #endif 6221 #ifdef CONFIG_IPV6_MROUTE 6222 { 6223 .procname = "mc_forwarding", 6224 .data = &ipv6_devconf.mc_forwarding, 6225 .maxlen = sizeof(int), 6226 .mode = 0444, 6227 .proc_handler = proc_dointvec, 6228 }, 6229 #endif 6230 { 6231 .procname = "disable_ipv6", 6232 .data = &ipv6_devconf.disable_ipv6, 6233 .maxlen = sizeof(int), 6234 .mode = 0644, 6235 .proc_handler = addrconf_sysctl_disable, 6236 }, 6237 { 6238 .procname = "accept_dad", 6239 .data = &ipv6_devconf.accept_dad, 6240 .maxlen = sizeof(int), 6241 .mode = 0644, 6242 .proc_handler = proc_dointvec, 6243 }, 6244 { 6245 .procname = "force_tllao", 6246 .data = &ipv6_devconf.force_tllao, 6247 .maxlen = sizeof(int), 6248 .mode = 0644, 6249 .proc_handler = proc_dointvec 6250 }, 6251 { 6252 .procname = "ndisc_notify", 6253 .data = &ipv6_devconf.ndisc_notify, 6254 .maxlen = sizeof(int), 6255 .mode = 0644, 6256 .proc_handler = proc_dointvec 6257 }, 6258 { 6259 .procname = "suppress_frag_ndisc", 6260 .data = &ipv6_devconf.suppress_frag_ndisc, 6261 .maxlen = sizeof(int), 6262 .mode = 0644, 6263 .proc_handler = proc_dointvec 6264 }, 6265 { 6266 .procname = "accept_ra_from_local", 6267 .data = &ipv6_devconf.accept_ra_from_local, 6268 .maxlen = sizeof(int), 6269 .mode = 0644, 6270 .proc_handler = proc_dointvec, 6271 }, 6272 { 6273 .procname = "accept_ra_mtu", 6274 .data = &ipv6_devconf.accept_ra_mtu, 6275 .maxlen = sizeof(int), 6276 .mode = 0644, 6277 .proc_handler = proc_dointvec, 6278 }, 6279 { 6280 .procname = "stable_secret", 6281 .data = &ipv6_devconf.stable_secret, 6282 .maxlen = IPV6_MAX_STRLEN, 6283 .mode = 0600, 6284 .proc_handler = addrconf_sysctl_stable_secret, 6285 }, 6286 { 6287 .procname = "use_oif_addrs_only", 6288 .data = &ipv6_devconf.use_oif_addrs_only, 6289 .maxlen = sizeof(int), 6290 .mode = 0644, 6291 .proc_handler = proc_dointvec, 6292 }, 6293 { 6294 .procname = "ignore_routes_with_linkdown", 6295 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6296 .maxlen = sizeof(int), 6297 .mode = 0644, 6298 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6299 }, 6300 { 6301 .procname = "drop_unicast_in_l2_multicast", 6302 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6303 .maxlen = sizeof(int), 6304 .mode = 0644, 6305 .proc_handler = proc_dointvec, 6306 }, 6307 { 6308 .procname = "drop_unsolicited_na", 6309 .data = &ipv6_devconf.drop_unsolicited_na, 6310 .maxlen = sizeof(int), 6311 .mode = 0644, 6312 .proc_handler = proc_dointvec, 6313 }, 6314 { 6315 .procname = "keep_addr_on_down", 6316 .data = &ipv6_devconf.keep_addr_on_down, 6317 .maxlen = sizeof(int), 6318 .mode = 0644, 6319 .proc_handler = proc_dointvec, 6320 6321 }, 6322 { 6323 .procname = "seg6_enabled", 6324 .data = &ipv6_devconf.seg6_enabled, 6325 .maxlen = sizeof(int), 6326 .mode = 0644, 6327 .proc_handler = proc_dointvec, 6328 }, 6329 #ifdef CONFIG_IPV6_SEG6_HMAC 6330 { 6331 .procname = "seg6_require_hmac", 6332 .data = &ipv6_devconf.seg6_require_hmac, 6333 .maxlen = sizeof(int), 6334 .mode = 0644, 6335 .proc_handler = proc_dointvec, 6336 }, 6337 #endif 6338 { 6339 .procname = "enhanced_dad", 6340 .data = &ipv6_devconf.enhanced_dad, 6341 .maxlen = sizeof(int), 6342 .mode = 0644, 6343 .proc_handler = proc_dointvec, 6344 }, 6345 { 6346 .procname = "addr_gen_mode", 6347 .data = &ipv6_devconf.addr_gen_mode, 6348 .maxlen = sizeof(int), 6349 .mode = 0644, 6350 .proc_handler = addrconf_sysctl_addr_gen_mode, 6351 }, 6352 { 6353 .procname = "disable_policy", 6354 .data = &ipv6_devconf.disable_policy, 6355 .maxlen = sizeof(int), 6356 .mode = 0644, 6357 .proc_handler = addrconf_sysctl_disable_policy, 6358 }, 6359 { 6360 /* sentinel */ 6361 } 6362 }; 6363 6364 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6365 struct inet6_dev *idev, struct ipv6_devconf *p) 6366 { 6367 int i, ifindex; 6368 struct ctl_table *table; 6369 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6370 6371 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6372 if (!table) 6373 goto out; 6374 6375 for (i = 0; table[i].data; i++) { 6376 table[i].data += (char *)p - (char *)&ipv6_devconf; 6377 /* If one of these is already set, then it is not safe to 6378 * overwrite either of them: this makes proc_dointvec_minmax 6379 * usable. 6380 */ 6381 if (!table[i].extra1 && !table[i].extra2) { 6382 table[i].extra1 = idev; /* embedded; no ref */ 6383 table[i].extra2 = net; 6384 } 6385 } 6386 6387 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6388 6389 p->sysctl_header = register_net_sysctl(net, path, table); 6390 if (!p->sysctl_header) 6391 goto free; 6392 6393 if (!strcmp(dev_name, "all")) 6394 ifindex = NETCONFA_IFINDEX_ALL; 6395 else if (!strcmp(dev_name, "default")) 6396 ifindex = NETCONFA_IFINDEX_DEFAULT; 6397 else 6398 ifindex = idev->dev->ifindex; 6399 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6400 ifindex, p); 6401 return 0; 6402 6403 free: 6404 kfree(table); 6405 out: 6406 return -ENOBUFS; 6407 } 6408 6409 static void __addrconf_sysctl_unregister(struct net *net, 6410 struct ipv6_devconf *p, int ifindex) 6411 { 6412 struct ctl_table *table; 6413 6414 if (!p->sysctl_header) 6415 return; 6416 6417 table = p->sysctl_header->ctl_table_arg; 6418 unregister_net_sysctl_table(p->sysctl_header); 6419 p->sysctl_header = NULL; 6420 kfree(table); 6421 6422 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6423 } 6424 6425 static int addrconf_sysctl_register(struct inet6_dev *idev) 6426 { 6427 int err; 6428 6429 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6430 return -EINVAL; 6431 6432 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6433 &ndisc_ifinfo_sysctl_change); 6434 if (err) 6435 return err; 6436 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6437 idev, &idev->cnf); 6438 if (err) 6439 neigh_sysctl_unregister(idev->nd_parms); 6440 6441 return err; 6442 } 6443 6444 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6445 { 6446 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6447 idev->dev->ifindex); 6448 neigh_sysctl_unregister(idev->nd_parms); 6449 } 6450 6451 6452 #endif 6453 6454 static int __net_init addrconf_init_net(struct net *net) 6455 { 6456 int err = -ENOMEM; 6457 struct ipv6_devconf *all, *dflt; 6458 6459 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6460 if (!all) 6461 goto err_alloc_all; 6462 6463 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6464 if (!dflt) 6465 goto err_alloc_dflt; 6466 6467 /* these will be inherited by all namespaces */ 6468 dflt->autoconf = ipv6_defaults.autoconf; 6469 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6470 6471 dflt->stable_secret.initialized = false; 6472 all->stable_secret.initialized = false; 6473 6474 net->ipv6.devconf_all = all; 6475 net->ipv6.devconf_dflt = dflt; 6476 6477 #ifdef CONFIG_SYSCTL 6478 err = __addrconf_sysctl_register(net, "all", NULL, all); 6479 if (err < 0) 6480 goto err_reg_all; 6481 6482 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6483 if (err < 0) 6484 goto err_reg_dflt; 6485 #endif 6486 return 0; 6487 6488 #ifdef CONFIG_SYSCTL 6489 err_reg_dflt: 6490 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6491 err_reg_all: 6492 kfree(dflt); 6493 #endif 6494 err_alloc_dflt: 6495 kfree(all); 6496 err_alloc_all: 6497 return err; 6498 } 6499 6500 static void __net_exit addrconf_exit_net(struct net *net) 6501 { 6502 #ifdef CONFIG_SYSCTL 6503 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6504 NETCONFA_IFINDEX_DEFAULT); 6505 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6506 NETCONFA_IFINDEX_ALL); 6507 #endif 6508 kfree(net->ipv6.devconf_dflt); 6509 kfree(net->ipv6.devconf_all); 6510 } 6511 6512 static struct pernet_operations addrconf_ops = { 6513 .init = addrconf_init_net, 6514 .exit = addrconf_exit_net, 6515 }; 6516 6517 static struct rtnl_af_ops inet6_ops __read_mostly = { 6518 .family = AF_INET6, 6519 .fill_link_af = inet6_fill_link_af, 6520 .get_link_af_size = inet6_get_link_af_size, 6521 .validate_link_af = inet6_validate_link_af, 6522 .set_link_af = inet6_set_link_af, 6523 }; 6524 6525 /* 6526 * Init / cleanup code 6527 */ 6528 6529 int __init addrconf_init(void) 6530 { 6531 struct inet6_dev *idev; 6532 int i, err; 6533 6534 err = ipv6_addr_label_init(); 6535 if (err < 0) { 6536 pr_crit("%s: cannot initialize default policy table: %d\n", 6537 __func__, err); 6538 goto out; 6539 } 6540 6541 err = register_pernet_subsys(&addrconf_ops); 6542 if (err < 0) 6543 goto out_addrlabel; 6544 6545 addrconf_wq = create_workqueue("ipv6_addrconf"); 6546 if (!addrconf_wq) { 6547 err = -ENOMEM; 6548 goto out_nowq; 6549 } 6550 6551 /* The addrconf netdev notifier requires that loopback_dev 6552 * has it's ipv6 private information allocated and setup 6553 * before it can bring up and give link-local addresses 6554 * to other devices which are up. 6555 * 6556 * Unfortunately, loopback_dev is not necessarily the first 6557 * entry in the global dev_base list of net devices. In fact, 6558 * it is likely to be the very last entry on that list. 6559 * So this causes the notifier registry below to try and 6560 * give link-local addresses to all devices besides loopback_dev 6561 * first, then loopback_dev, which cases all the non-loopback_dev 6562 * devices to fail to get a link-local address. 6563 * 6564 * So, as a temporary fix, allocate the ipv6 structure for 6565 * loopback_dev first by hand. 6566 * Longer term, all of the dependencies ipv6 has upon the loopback 6567 * device and it being up should be removed. 6568 */ 6569 rtnl_lock(); 6570 idev = ipv6_add_dev(init_net.loopback_dev); 6571 rtnl_unlock(); 6572 if (IS_ERR(idev)) { 6573 err = PTR_ERR(idev); 6574 goto errlo; 6575 } 6576 6577 ip6_route_init_special_entries(); 6578 6579 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6580 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6581 6582 register_netdevice_notifier(&ipv6_dev_notf); 6583 6584 addrconf_verify(); 6585 6586 rtnl_af_register(&inet6_ops); 6587 6588 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6589 0); 6590 if (err < 0) 6591 goto errout; 6592 6593 /* Only the first call to __rtnl_register can fail */ 6594 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0); 6595 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0); 6596 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6597 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED); 6598 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6599 inet6_dump_ifmcaddr, 0); 6600 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6601 inet6_dump_ifacaddr, 0); 6602 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6603 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED); 6604 6605 ipv6_addr_label_rtnl_register(); 6606 6607 return 0; 6608 errout: 6609 rtnl_af_unregister(&inet6_ops); 6610 unregister_netdevice_notifier(&ipv6_dev_notf); 6611 errlo: 6612 destroy_workqueue(addrconf_wq); 6613 out_nowq: 6614 unregister_pernet_subsys(&addrconf_ops); 6615 out_addrlabel: 6616 ipv6_addr_label_cleanup(); 6617 out: 6618 return err; 6619 } 6620 6621 void addrconf_cleanup(void) 6622 { 6623 struct net_device *dev; 6624 int i; 6625 6626 unregister_netdevice_notifier(&ipv6_dev_notf); 6627 unregister_pernet_subsys(&addrconf_ops); 6628 ipv6_addr_label_cleanup(); 6629 6630 rtnl_af_unregister(&inet6_ops); 6631 6632 rtnl_lock(); 6633 6634 /* clean dev list */ 6635 for_each_netdev(&init_net, dev) { 6636 if (__in6_dev_get(dev) == NULL) 6637 continue; 6638 addrconf_ifdown(dev, 1); 6639 } 6640 addrconf_ifdown(init_net.loopback_dev, 2); 6641 6642 /* 6643 * Check hash table. 6644 */ 6645 spin_lock_bh(&addrconf_hash_lock); 6646 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6647 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6648 spin_unlock_bh(&addrconf_hash_lock); 6649 cancel_delayed_work(&addr_chk_work); 6650 rtnl_unlock(); 6651 6652 destroy_workqueue(addrconf_wq); 6653 } 6654