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 bool send_na); 191 static void addrconf_dad_run(struct inet6_dev *idev); 192 static void addrconf_rs_timer(struct timer_list *t); 193 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 194 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 195 196 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 197 struct prefix_info *pinfo); 198 199 static struct ipv6_devconf ipv6_devconf __read_mostly = { 200 .forwarding = 0, 201 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 202 .mtu6 = IPV6_MIN_MTU, 203 .accept_ra = 1, 204 .accept_redirects = 1, 205 .autoconf = 1, 206 .force_mld_version = 0, 207 .mldv1_unsolicited_report_interval = 10 * HZ, 208 .mldv2_unsolicited_report_interval = HZ, 209 .dad_transmits = 1, 210 .rtr_solicits = MAX_RTR_SOLICITATIONS, 211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 212 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 213 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 214 .use_tempaddr = 0, 215 .temp_valid_lft = TEMP_VALID_LIFETIME, 216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 217 .regen_max_retry = REGEN_MAX_RETRY, 218 .max_desync_factor = MAX_DESYNC_FACTOR, 219 .max_addresses = IPV6_MAX_ADDRESSES, 220 .accept_ra_defrtr = 1, 221 .accept_ra_from_local = 0, 222 .accept_ra_min_hop_limit= 1, 223 .accept_ra_pinfo = 1, 224 #ifdef CONFIG_IPV6_ROUTER_PREF 225 .accept_ra_rtr_pref = 1, 226 .rtr_probe_interval = 60 * HZ, 227 #ifdef CONFIG_IPV6_ROUTE_INFO 228 .accept_ra_rt_info_min_plen = 0, 229 .accept_ra_rt_info_max_plen = 0, 230 #endif 231 #endif 232 .proxy_ndp = 0, 233 .accept_source_route = 0, /* we do not accept RH0 by default. */ 234 .disable_ipv6 = 0, 235 .accept_dad = 0, 236 .suppress_frag_ndisc = 1, 237 .accept_ra_mtu = 1, 238 .stable_secret = { 239 .initialized = false, 240 }, 241 .use_oif_addrs_only = 0, 242 .ignore_routes_with_linkdown = 0, 243 .keep_addr_on_down = 0, 244 .seg6_enabled = 0, 245 #ifdef CONFIG_IPV6_SEG6_HMAC 246 .seg6_require_hmac = 0, 247 #endif 248 .enhanced_dad = 1, 249 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 250 .disable_policy = 0, 251 }; 252 253 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 254 .forwarding = 0, 255 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 256 .mtu6 = IPV6_MIN_MTU, 257 .accept_ra = 1, 258 .accept_redirects = 1, 259 .autoconf = 1, 260 .force_mld_version = 0, 261 .mldv1_unsolicited_report_interval = 10 * HZ, 262 .mldv2_unsolicited_report_interval = HZ, 263 .dad_transmits = 1, 264 .rtr_solicits = MAX_RTR_SOLICITATIONS, 265 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 266 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 267 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 268 .use_tempaddr = 0, 269 .temp_valid_lft = TEMP_VALID_LIFETIME, 270 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 271 .regen_max_retry = REGEN_MAX_RETRY, 272 .max_desync_factor = MAX_DESYNC_FACTOR, 273 .max_addresses = IPV6_MAX_ADDRESSES, 274 .accept_ra_defrtr = 1, 275 .accept_ra_from_local = 0, 276 .accept_ra_min_hop_limit= 1, 277 .accept_ra_pinfo = 1, 278 #ifdef CONFIG_IPV6_ROUTER_PREF 279 .accept_ra_rtr_pref = 1, 280 .rtr_probe_interval = 60 * HZ, 281 #ifdef CONFIG_IPV6_ROUTE_INFO 282 .accept_ra_rt_info_min_plen = 0, 283 .accept_ra_rt_info_max_plen = 0, 284 #endif 285 #endif 286 .proxy_ndp = 0, 287 .accept_source_route = 0, /* we do not accept RH0 by default. */ 288 .disable_ipv6 = 0, 289 .accept_dad = 1, 290 .suppress_frag_ndisc = 1, 291 .accept_ra_mtu = 1, 292 .stable_secret = { 293 .initialized = false, 294 }, 295 .use_oif_addrs_only = 0, 296 .ignore_routes_with_linkdown = 0, 297 .keep_addr_on_down = 0, 298 .seg6_enabled = 0, 299 #ifdef CONFIG_IPV6_SEG6_HMAC 300 .seg6_require_hmac = 0, 301 #endif 302 .enhanced_dad = 1, 303 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 304 .disable_policy = 0, 305 }; 306 307 /* Check if link is ready: is it up and is a valid qdisc available */ 308 static inline bool addrconf_link_ready(const struct net_device *dev) 309 { 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311 } 312 313 static void addrconf_del_rs_timer(struct inet6_dev *idev) 314 { 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317 } 318 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320 { 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323 } 324 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327 { 328 if (!timer_pending(&idev->rs_timer)) 329 in6_dev_hold(idev); 330 mod_timer(&idev->rs_timer, jiffies + when); 331 } 332 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 334 unsigned long delay) 335 { 336 in6_ifa_hold(ifp); 337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 338 in6_ifa_put(ifp); 339 } 340 341 static int snmp6_alloc_dev(struct inet6_dev *idev) 342 { 343 int i; 344 345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 346 if (!idev->stats.ipv6) 347 goto err_ip; 348 349 for_each_possible_cpu(i) { 350 struct ipstats_mib *addrconf_stats; 351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 352 u64_stats_init(&addrconf_stats->syncp); 353 } 354 355 356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 357 GFP_KERNEL); 358 if (!idev->stats.icmpv6dev) 359 goto err_icmp; 360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 361 GFP_KERNEL); 362 if (!idev->stats.icmpv6msgdev) 363 goto err_icmpmsg; 364 365 return 0; 366 367 err_icmpmsg: 368 kfree(idev->stats.icmpv6dev); 369 err_icmp: 370 free_percpu(idev->stats.ipv6); 371 err_ip: 372 return -ENOMEM; 373 } 374 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 376 { 377 struct inet6_dev *ndev; 378 int err = -ENOMEM; 379 380 ASSERT_RTNL(); 381 382 if (dev->mtu < IPV6_MIN_MTU) 383 return ERR_PTR(-EINVAL); 384 385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 386 if (!ndev) 387 return ERR_PTR(err); 388 389 rwlock_init(&ndev->lock); 390 ndev->dev = dev; 391 INIT_LIST_HEAD(&ndev->addr_list); 392 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 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 rt6_sync_down_dev(dev, event); 3443 break; 3444 } 3445 3446 if (idev) { 3447 if (idev->if_flags & IF_READY) { 3448 /* device is already configured - 3449 * but resend MLD reports, we might 3450 * have roamed and need to update 3451 * multicast snooping switches 3452 */ 3453 ipv6_mc_up(idev); 3454 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3455 break; 3456 } 3457 idev->if_flags |= IF_READY; 3458 } 3459 3460 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3461 dev->name); 3462 3463 run_pending = 1; 3464 } 3465 3466 switch (dev->type) { 3467 #if IS_ENABLED(CONFIG_IPV6_SIT) 3468 case ARPHRD_SIT: 3469 addrconf_sit_config(dev); 3470 break; 3471 #endif 3472 #if IS_ENABLED(CONFIG_NET_IPGRE) 3473 case ARPHRD_IPGRE: 3474 addrconf_gre_config(dev); 3475 break; 3476 #endif 3477 case ARPHRD_LOOPBACK: 3478 init_loopback(dev); 3479 break; 3480 3481 default: 3482 addrconf_dev_config(dev); 3483 break; 3484 } 3485 3486 if (!IS_ERR_OR_NULL(idev)) { 3487 if (run_pending) 3488 addrconf_dad_run(idev); 3489 3490 /* Device has an address by now */ 3491 rt6_sync_up(dev, RTNH_F_DEAD); 3492 3493 /* 3494 * If the MTU changed during the interface down, 3495 * when the interface up, the changed MTU must be 3496 * reflected in the idev as well as routers. 3497 */ 3498 if (idev->cnf.mtu6 != dev->mtu && 3499 dev->mtu >= IPV6_MIN_MTU) { 3500 rt6_mtu_change(dev, dev->mtu); 3501 idev->cnf.mtu6 = dev->mtu; 3502 } 3503 idev->tstamp = jiffies; 3504 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3505 3506 /* 3507 * If the changed mtu during down is lower than 3508 * IPV6_MIN_MTU stop IPv6 on this interface. 3509 */ 3510 if (dev->mtu < IPV6_MIN_MTU) 3511 addrconf_ifdown(dev, dev != net->loopback_dev); 3512 } 3513 break; 3514 3515 case NETDEV_DOWN: 3516 case NETDEV_UNREGISTER: 3517 /* 3518 * Remove all addresses from this interface. 3519 */ 3520 addrconf_ifdown(dev, event != NETDEV_DOWN); 3521 break; 3522 3523 case NETDEV_CHANGENAME: 3524 if (idev) { 3525 snmp6_unregister_dev(idev); 3526 addrconf_sysctl_unregister(idev); 3527 err = addrconf_sysctl_register(idev); 3528 if (err) 3529 return notifier_from_errno(err); 3530 err = snmp6_register_dev(idev); 3531 if (err) { 3532 addrconf_sysctl_unregister(idev); 3533 return notifier_from_errno(err); 3534 } 3535 } 3536 break; 3537 3538 case NETDEV_PRE_TYPE_CHANGE: 3539 case NETDEV_POST_TYPE_CHANGE: 3540 if (idev) 3541 addrconf_type_change(dev, event); 3542 break; 3543 3544 case NETDEV_CHANGEUPPER: 3545 info = ptr; 3546 3547 /* flush all routes if dev is linked to or unlinked from 3548 * an L3 master device (e.g., VRF) 3549 */ 3550 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3551 addrconf_ifdown(dev, 0); 3552 } 3553 3554 return NOTIFY_OK; 3555 } 3556 3557 /* 3558 * addrconf module should be notified of a device going up 3559 */ 3560 static struct notifier_block ipv6_dev_notf = { 3561 .notifier_call = addrconf_notify, 3562 .priority = ADDRCONF_NOTIFY_PRIORITY, 3563 }; 3564 3565 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3566 { 3567 struct inet6_dev *idev; 3568 ASSERT_RTNL(); 3569 3570 idev = __in6_dev_get(dev); 3571 3572 if (event == NETDEV_POST_TYPE_CHANGE) 3573 ipv6_mc_remap(idev); 3574 else if (event == NETDEV_PRE_TYPE_CHANGE) 3575 ipv6_mc_unmap(idev); 3576 } 3577 3578 static bool addr_is_local(const struct in6_addr *addr) 3579 { 3580 return ipv6_addr_type(addr) & 3581 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3582 } 3583 3584 static int addrconf_ifdown(struct net_device *dev, int how) 3585 { 3586 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3587 struct net *net = dev_net(dev); 3588 struct inet6_dev *idev; 3589 struct inet6_ifaddr *ifa, *tmp; 3590 int _keep_addr; 3591 bool keep_addr; 3592 int state, i; 3593 3594 ASSERT_RTNL(); 3595 3596 rt6_disable_ip(dev, event); 3597 3598 idev = __in6_dev_get(dev); 3599 if (!idev) 3600 return -ENODEV; 3601 3602 /* 3603 * Step 1: remove reference to ipv6 device from parent device. 3604 * Do not dev_put! 3605 */ 3606 if (how) { 3607 idev->dead = 1; 3608 3609 /* protected by rtnl_lock */ 3610 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3611 3612 /* Step 1.5: remove snmp6 entry */ 3613 snmp6_unregister_dev(idev); 3614 3615 } 3616 3617 /* aggregate the system setting and interface setting */ 3618 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3619 if (!_keep_addr) 3620 _keep_addr = idev->cnf.keep_addr_on_down; 3621 3622 /* combine the user config with event to determine if permanent 3623 * addresses are to be removed from address hash table 3624 */ 3625 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3626 3627 /* Step 2: clear hash table */ 3628 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3629 struct hlist_head *h = &inet6_addr_lst[i]; 3630 3631 spin_lock_bh(&addrconf_hash_lock); 3632 restart: 3633 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3634 if (ifa->idev == idev) { 3635 addrconf_del_dad_work(ifa); 3636 /* combined flag + permanent flag decide if 3637 * address is retained on a down event 3638 */ 3639 if (!keep_addr || 3640 !(ifa->flags & IFA_F_PERMANENT) || 3641 addr_is_local(&ifa->addr)) { 3642 hlist_del_init_rcu(&ifa->addr_lst); 3643 goto restart; 3644 } 3645 } 3646 } 3647 spin_unlock_bh(&addrconf_hash_lock); 3648 } 3649 3650 write_lock_bh(&idev->lock); 3651 3652 addrconf_del_rs_timer(idev); 3653 3654 /* Step 2: clear flags for stateless addrconf */ 3655 if (!how) 3656 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3657 3658 /* Step 3: clear tempaddr list */ 3659 while (!list_empty(&idev->tempaddr_list)) { 3660 ifa = list_first_entry(&idev->tempaddr_list, 3661 struct inet6_ifaddr, tmp_list); 3662 list_del(&ifa->tmp_list); 3663 write_unlock_bh(&idev->lock); 3664 spin_lock_bh(&ifa->lock); 3665 3666 if (ifa->ifpub) { 3667 in6_ifa_put(ifa->ifpub); 3668 ifa->ifpub = NULL; 3669 } 3670 spin_unlock_bh(&ifa->lock); 3671 in6_ifa_put(ifa); 3672 write_lock_bh(&idev->lock); 3673 } 3674 3675 /* re-combine the user config with event to determine if permanent 3676 * addresses are to be removed from the interface list 3677 */ 3678 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3679 3680 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3681 struct rt6_info *rt = NULL; 3682 bool keep; 3683 3684 addrconf_del_dad_work(ifa); 3685 3686 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3687 !addr_is_local(&ifa->addr); 3688 3689 write_unlock_bh(&idev->lock); 3690 spin_lock_bh(&ifa->lock); 3691 3692 if (keep) { 3693 /* set state to skip the notifier below */ 3694 state = INET6_IFADDR_STATE_DEAD; 3695 ifa->state = INET6_IFADDR_STATE_PREDAD; 3696 if (!(ifa->flags & IFA_F_NODAD)) 3697 ifa->flags |= IFA_F_TENTATIVE; 3698 3699 rt = ifa->rt; 3700 ifa->rt = NULL; 3701 } else { 3702 state = ifa->state; 3703 ifa->state = INET6_IFADDR_STATE_DEAD; 3704 } 3705 3706 spin_unlock_bh(&ifa->lock); 3707 3708 if (rt) 3709 ip6_del_rt(rt); 3710 3711 if (state != INET6_IFADDR_STATE_DEAD) { 3712 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3713 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3714 } else { 3715 if (idev->cnf.forwarding) 3716 addrconf_leave_anycast(ifa); 3717 addrconf_leave_solict(ifa->idev, &ifa->addr); 3718 } 3719 3720 write_lock_bh(&idev->lock); 3721 if (!keep) { 3722 list_del_rcu(&ifa->if_list); 3723 in6_ifa_put(ifa); 3724 } 3725 } 3726 3727 write_unlock_bh(&idev->lock); 3728 3729 /* Step 5: Discard anycast and multicast list */ 3730 if (how) { 3731 ipv6_ac_destroy_dev(idev); 3732 ipv6_mc_destroy_dev(idev); 3733 } else { 3734 ipv6_mc_down(idev); 3735 } 3736 3737 idev->tstamp = jiffies; 3738 3739 /* Last: Shot the device (if unregistered) */ 3740 if (how) { 3741 addrconf_sysctl_unregister(idev); 3742 neigh_parms_release(&nd_tbl, idev->nd_parms); 3743 neigh_ifdown(&nd_tbl, dev); 3744 in6_dev_put(idev); 3745 } 3746 return 0; 3747 } 3748 3749 static void addrconf_rs_timer(struct timer_list *t) 3750 { 3751 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3752 struct net_device *dev = idev->dev; 3753 struct in6_addr lladdr; 3754 3755 write_lock(&idev->lock); 3756 if (idev->dead || !(idev->if_flags & IF_READY)) 3757 goto out; 3758 3759 if (!ipv6_accept_ra(idev)) 3760 goto out; 3761 3762 /* Announcement received after solicitation was sent */ 3763 if (idev->if_flags & IF_RA_RCVD) 3764 goto out; 3765 3766 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3767 write_unlock(&idev->lock); 3768 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3769 ndisc_send_rs(dev, &lladdr, 3770 &in6addr_linklocal_allrouters); 3771 else 3772 goto put; 3773 3774 write_lock(&idev->lock); 3775 idev->rs_interval = rfc3315_s14_backoff_update( 3776 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3777 /* The wait after the last probe can be shorter */ 3778 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3779 idev->cnf.rtr_solicits) ? 3780 idev->cnf.rtr_solicit_delay : 3781 idev->rs_interval); 3782 } else { 3783 /* 3784 * Note: we do not support deprecated "all on-link" 3785 * assumption any longer. 3786 */ 3787 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3788 } 3789 3790 out: 3791 write_unlock(&idev->lock); 3792 put: 3793 in6_dev_put(idev); 3794 } 3795 3796 /* 3797 * Duplicate Address Detection 3798 */ 3799 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3800 { 3801 unsigned long rand_num; 3802 struct inet6_dev *idev = ifp->idev; 3803 u64 nonce; 3804 3805 if (ifp->flags & IFA_F_OPTIMISTIC) 3806 rand_num = 0; 3807 else 3808 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3809 3810 nonce = 0; 3811 if (idev->cnf.enhanced_dad || 3812 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3813 do 3814 get_random_bytes(&nonce, 6); 3815 while (nonce == 0); 3816 } 3817 ifp->dad_nonce = nonce; 3818 ifp->dad_probes = idev->cnf.dad_transmits; 3819 addrconf_mod_dad_work(ifp, rand_num); 3820 } 3821 3822 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3823 { 3824 struct inet6_dev *idev = ifp->idev; 3825 struct net_device *dev = idev->dev; 3826 bool bump_id, notify = false; 3827 3828 addrconf_join_solict(dev, &ifp->addr); 3829 3830 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3831 3832 read_lock_bh(&idev->lock); 3833 spin_lock(&ifp->lock); 3834 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3835 goto out; 3836 3837 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3838 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3839 idev->cnf.accept_dad < 1) || 3840 !(ifp->flags&IFA_F_TENTATIVE) || 3841 ifp->flags & IFA_F_NODAD) { 3842 bool send_na = false; 3843 3844 if (ifp->flags & IFA_F_TENTATIVE && 3845 !(ifp->flags & IFA_F_OPTIMISTIC)) 3846 send_na = true; 3847 bump_id = ifp->flags & IFA_F_TENTATIVE; 3848 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3849 spin_unlock(&ifp->lock); 3850 read_unlock_bh(&idev->lock); 3851 3852 addrconf_dad_completed(ifp, bump_id, send_na); 3853 return; 3854 } 3855 3856 if (!(idev->if_flags & IF_READY)) { 3857 spin_unlock(&ifp->lock); 3858 read_unlock_bh(&idev->lock); 3859 /* 3860 * If the device is not ready: 3861 * - keep it tentative if it is a permanent address. 3862 * - otherwise, kill it. 3863 */ 3864 in6_ifa_hold(ifp); 3865 addrconf_dad_stop(ifp, 0); 3866 return; 3867 } 3868 3869 /* 3870 * Optimistic nodes can start receiving 3871 * Frames right away 3872 */ 3873 if (ifp->flags & IFA_F_OPTIMISTIC) { 3874 ip6_ins_rt(ifp->rt); 3875 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3876 /* Because optimistic nodes can use this address, 3877 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3878 */ 3879 notify = true; 3880 } 3881 } 3882 3883 addrconf_dad_kick(ifp); 3884 out: 3885 spin_unlock(&ifp->lock); 3886 read_unlock_bh(&idev->lock); 3887 if (notify) 3888 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3889 } 3890 3891 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3892 { 3893 bool begin_dad = false; 3894 3895 spin_lock_bh(&ifp->lock); 3896 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3897 ifp->state = INET6_IFADDR_STATE_PREDAD; 3898 begin_dad = true; 3899 } 3900 spin_unlock_bh(&ifp->lock); 3901 3902 if (begin_dad) 3903 addrconf_mod_dad_work(ifp, 0); 3904 } 3905 3906 static void addrconf_dad_work(struct work_struct *w) 3907 { 3908 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3909 struct inet6_ifaddr, 3910 dad_work); 3911 struct inet6_dev *idev = ifp->idev; 3912 bool bump_id, disable_ipv6 = false; 3913 struct in6_addr mcaddr; 3914 3915 enum { 3916 DAD_PROCESS, 3917 DAD_BEGIN, 3918 DAD_ABORT, 3919 } action = DAD_PROCESS; 3920 3921 rtnl_lock(); 3922 3923 spin_lock_bh(&ifp->lock); 3924 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3925 action = DAD_BEGIN; 3926 ifp->state = INET6_IFADDR_STATE_DAD; 3927 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3928 action = DAD_ABORT; 3929 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3930 3931 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3932 idev->cnf.accept_dad > 1) && 3933 !idev->cnf.disable_ipv6 && 3934 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3935 struct in6_addr addr; 3936 3937 addr.s6_addr32[0] = htonl(0xfe800000); 3938 addr.s6_addr32[1] = 0; 3939 3940 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3941 ipv6_addr_equal(&ifp->addr, &addr)) { 3942 /* DAD failed for link-local based on MAC */ 3943 idev->cnf.disable_ipv6 = 1; 3944 3945 pr_info("%s: IPv6 being disabled!\n", 3946 ifp->idev->dev->name); 3947 disable_ipv6 = true; 3948 } 3949 } 3950 } 3951 spin_unlock_bh(&ifp->lock); 3952 3953 if (action == DAD_BEGIN) { 3954 addrconf_dad_begin(ifp); 3955 goto out; 3956 } else if (action == DAD_ABORT) { 3957 in6_ifa_hold(ifp); 3958 addrconf_dad_stop(ifp, 1); 3959 if (disable_ipv6) 3960 addrconf_ifdown(idev->dev, 0); 3961 goto out; 3962 } 3963 3964 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3965 goto out; 3966 3967 write_lock_bh(&idev->lock); 3968 if (idev->dead || !(idev->if_flags & IF_READY)) { 3969 write_unlock_bh(&idev->lock); 3970 goto out; 3971 } 3972 3973 spin_lock(&ifp->lock); 3974 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3975 spin_unlock(&ifp->lock); 3976 write_unlock_bh(&idev->lock); 3977 goto out; 3978 } 3979 3980 if (ifp->dad_probes == 0) { 3981 bool send_na = false; 3982 3983 /* 3984 * DAD was successful 3985 */ 3986 3987 if (ifp->flags & IFA_F_TENTATIVE && 3988 !(ifp->flags & IFA_F_OPTIMISTIC)) 3989 send_na = true; 3990 bump_id = ifp->flags & IFA_F_TENTATIVE; 3991 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3992 spin_unlock(&ifp->lock); 3993 write_unlock_bh(&idev->lock); 3994 3995 addrconf_dad_completed(ifp, bump_id, send_na); 3996 3997 goto out; 3998 } 3999 4000 ifp->dad_probes--; 4001 addrconf_mod_dad_work(ifp, 4002 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4003 spin_unlock(&ifp->lock); 4004 write_unlock_bh(&idev->lock); 4005 4006 /* send a neighbour solicitation for our addr */ 4007 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4008 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4009 ifp->dad_nonce); 4010 out: 4011 in6_ifa_put(ifp); 4012 rtnl_unlock(); 4013 } 4014 4015 /* ifp->idev must be at least read locked */ 4016 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4017 { 4018 struct inet6_ifaddr *ifpiter; 4019 struct inet6_dev *idev = ifp->idev; 4020 4021 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4022 if (ifpiter->scope > IFA_LINK) 4023 break; 4024 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4025 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4026 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4027 IFA_F_PERMANENT) 4028 return false; 4029 } 4030 return true; 4031 } 4032 4033 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4034 bool send_na) 4035 { 4036 struct net_device *dev = ifp->idev->dev; 4037 struct in6_addr lladdr; 4038 bool send_rs, send_mld; 4039 4040 addrconf_del_dad_work(ifp); 4041 4042 /* 4043 * Configure the address for reception. Now it is valid. 4044 */ 4045 4046 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4047 4048 /* If added prefix is link local and we are prepared to process 4049 router advertisements, start sending router solicitations. 4050 */ 4051 4052 read_lock_bh(&ifp->idev->lock); 4053 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4054 send_rs = send_mld && 4055 ipv6_accept_ra(ifp->idev) && 4056 ifp->idev->cnf.rtr_solicits != 0 && 4057 (dev->flags&IFF_LOOPBACK) == 0; 4058 read_unlock_bh(&ifp->idev->lock); 4059 4060 /* While dad is in progress mld report's source address is in6_addrany. 4061 * Resend with proper ll now. 4062 */ 4063 if (send_mld) 4064 ipv6_mc_dad_complete(ifp->idev); 4065 4066 /* send unsolicited NA if enabled */ 4067 if (send_na && 4068 (ifp->idev->cnf.ndisc_notify || 4069 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4070 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4071 /*router=*/ !!ifp->idev->cnf.forwarding, 4072 /*solicited=*/ false, /*override=*/ true, 4073 /*inc_opt=*/ true); 4074 } 4075 4076 if (send_rs) { 4077 /* 4078 * If a host as already performed a random delay 4079 * [...] as part of DAD [...] there is no need 4080 * to delay again before sending the first RS 4081 */ 4082 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4083 return; 4084 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4085 4086 write_lock_bh(&ifp->idev->lock); 4087 spin_lock(&ifp->lock); 4088 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4089 ifp->idev->cnf.rtr_solicit_interval); 4090 ifp->idev->rs_probes = 1; 4091 ifp->idev->if_flags |= IF_RS_SENT; 4092 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4093 spin_unlock(&ifp->lock); 4094 write_unlock_bh(&ifp->idev->lock); 4095 } 4096 4097 if (bump_id) 4098 rt_genid_bump_ipv6(dev_net(dev)); 4099 4100 /* Make sure that a new temporary address will be created 4101 * before this temporary address becomes deprecated. 4102 */ 4103 if (ifp->flags & IFA_F_TEMPORARY) 4104 addrconf_verify_rtnl(); 4105 } 4106 4107 static void addrconf_dad_run(struct inet6_dev *idev) 4108 { 4109 struct inet6_ifaddr *ifp; 4110 4111 read_lock_bh(&idev->lock); 4112 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4113 spin_lock(&ifp->lock); 4114 if (ifp->flags & IFA_F_TENTATIVE && 4115 ifp->state == INET6_IFADDR_STATE_DAD) 4116 addrconf_dad_kick(ifp); 4117 spin_unlock(&ifp->lock); 4118 } 4119 read_unlock_bh(&idev->lock); 4120 } 4121 4122 #ifdef CONFIG_PROC_FS 4123 struct if6_iter_state { 4124 struct seq_net_private p; 4125 int bucket; 4126 int offset; 4127 }; 4128 4129 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4130 { 4131 struct if6_iter_state *state = seq->private; 4132 struct net *net = seq_file_net(seq); 4133 struct inet6_ifaddr *ifa = NULL; 4134 int p = 0; 4135 4136 /* initial bucket if pos is 0 */ 4137 if (pos == 0) { 4138 state->bucket = 0; 4139 state->offset = 0; 4140 } 4141 4142 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4143 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4144 addr_lst) { 4145 if (!net_eq(dev_net(ifa->idev->dev), net)) 4146 continue; 4147 /* sync with offset */ 4148 if (p < state->offset) { 4149 p++; 4150 continue; 4151 } 4152 state->offset++; 4153 return ifa; 4154 } 4155 4156 /* prepare for next bucket */ 4157 state->offset = 0; 4158 p = 0; 4159 } 4160 return NULL; 4161 } 4162 4163 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4164 struct inet6_ifaddr *ifa) 4165 { 4166 struct if6_iter_state *state = seq->private; 4167 struct net *net = seq_file_net(seq); 4168 4169 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4170 if (!net_eq(dev_net(ifa->idev->dev), net)) 4171 continue; 4172 state->offset++; 4173 return ifa; 4174 } 4175 4176 while (++state->bucket < IN6_ADDR_HSIZE) { 4177 state->offset = 0; 4178 hlist_for_each_entry_rcu(ifa, 4179 &inet6_addr_lst[state->bucket], addr_lst) { 4180 if (!net_eq(dev_net(ifa->idev->dev), net)) 4181 continue; 4182 state->offset++; 4183 return ifa; 4184 } 4185 } 4186 4187 return NULL; 4188 } 4189 4190 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4191 __acquires(rcu) 4192 { 4193 rcu_read_lock(); 4194 return if6_get_first(seq, *pos); 4195 } 4196 4197 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4198 { 4199 struct inet6_ifaddr *ifa; 4200 4201 ifa = if6_get_next(seq, v); 4202 ++*pos; 4203 return ifa; 4204 } 4205 4206 static void if6_seq_stop(struct seq_file *seq, void *v) 4207 __releases(rcu) 4208 { 4209 rcu_read_unlock(); 4210 } 4211 4212 static int if6_seq_show(struct seq_file *seq, void *v) 4213 { 4214 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4215 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4216 &ifp->addr, 4217 ifp->idev->dev->ifindex, 4218 ifp->prefix_len, 4219 ifp->scope, 4220 (u8) ifp->flags, 4221 ifp->idev->dev->name); 4222 return 0; 4223 } 4224 4225 static const struct seq_operations if6_seq_ops = { 4226 .start = if6_seq_start, 4227 .next = if6_seq_next, 4228 .show = if6_seq_show, 4229 .stop = if6_seq_stop, 4230 }; 4231 4232 static int if6_seq_open(struct inode *inode, struct file *file) 4233 { 4234 return seq_open_net(inode, file, &if6_seq_ops, 4235 sizeof(struct if6_iter_state)); 4236 } 4237 4238 static const struct file_operations if6_fops = { 4239 .open = if6_seq_open, 4240 .read = seq_read, 4241 .llseek = seq_lseek, 4242 .release = seq_release_net, 4243 }; 4244 4245 static int __net_init if6_proc_net_init(struct net *net) 4246 { 4247 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4248 return -ENOMEM; 4249 return 0; 4250 } 4251 4252 static void __net_exit if6_proc_net_exit(struct net *net) 4253 { 4254 remove_proc_entry("if_inet6", net->proc_net); 4255 } 4256 4257 static struct pernet_operations if6_proc_net_ops = { 4258 .init = if6_proc_net_init, 4259 .exit = if6_proc_net_exit, 4260 }; 4261 4262 int __init if6_proc_init(void) 4263 { 4264 return register_pernet_subsys(&if6_proc_net_ops); 4265 } 4266 4267 void if6_proc_exit(void) 4268 { 4269 unregister_pernet_subsys(&if6_proc_net_ops); 4270 } 4271 #endif /* CONFIG_PROC_FS */ 4272 4273 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4274 /* Check if address is a home address configured on any interface. */ 4275 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4276 { 4277 unsigned int hash = inet6_addr_hash(net, addr); 4278 struct inet6_ifaddr *ifp = NULL; 4279 int ret = 0; 4280 4281 rcu_read_lock(); 4282 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4283 if (!net_eq(dev_net(ifp->idev->dev), net)) 4284 continue; 4285 if (ipv6_addr_equal(&ifp->addr, addr) && 4286 (ifp->flags & IFA_F_HOMEADDRESS)) { 4287 ret = 1; 4288 break; 4289 } 4290 } 4291 rcu_read_unlock(); 4292 return ret; 4293 } 4294 #endif 4295 4296 /* 4297 * Periodic address status verification 4298 */ 4299 4300 static void addrconf_verify_rtnl(void) 4301 { 4302 unsigned long now, next, next_sec, next_sched; 4303 struct inet6_ifaddr *ifp; 4304 int i; 4305 4306 ASSERT_RTNL(); 4307 4308 rcu_read_lock_bh(); 4309 now = jiffies; 4310 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4311 4312 cancel_delayed_work(&addr_chk_work); 4313 4314 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4315 restart: 4316 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4317 unsigned long age; 4318 4319 /* When setting preferred_lft to a value not zero or 4320 * infinity, while valid_lft is infinity 4321 * IFA_F_PERMANENT has a non-infinity life time. 4322 */ 4323 if ((ifp->flags & IFA_F_PERMANENT) && 4324 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4325 continue; 4326 4327 spin_lock(&ifp->lock); 4328 /* We try to batch several events at once. */ 4329 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4330 4331 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4332 age >= ifp->valid_lft) { 4333 spin_unlock(&ifp->lock); 4334 in6_ifa_hold(ifp); 4335 ipv6_del_addr(ifp); 4336 goto restart; 4337 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4338 spin_unlock(&ifp->lock); 4339 continue; 4340 } else if (age >= ifp->prefered_lft) { 4341 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4342 int deprecate = 0; 4343 4344 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4345 deprecate = 1; 4346 ifp->flags |= IFA_F_DEPRECATED; 4347 } 4348 4349 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4350 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4351 next = ifp->tstamp + ifp->valid_lft * HZ; 4352 4353 spin_unlock(&ifp->lock); 4354 4355 if (deprecate) { 4356 in6_ifa_hold(ifp); 4357 4358 ipv6_ifa_notify(0, ifp); 4359 in6_ifa_put(ifp); 4360 goto restart; 4361 } 4362 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4363 !(ifp->flags&IFA_F_TENTATIVE)) { 4364 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4365 ifp->idev->cnf.dad_transmits * 4366 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4367 4368 if (age >= ifp->prefered_lft - regen_advance) { 4369 struct inet6_ifaddr *ifpub = ifp->ifpub; 4370 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4371 next = ifp->tstamp + ifp->prefered_lft * HZ; 4372 if (!ifp->regen_count && ifpub) { 4373 ifp->regen_count++; 4374 in6_ifa_hold(ifp); 4375 in6_ifa_hold(ifpub); 4376 spin_unlock(&ifp->lock); 4377 4378 spin_lock(&ifpub->lock); 4379 ifpub->regen_count = 0; 4380 spin_unlock(&ifpub->lock); 4381 rcu_read_unlock_bh(); 4382 ipv6_create_tempaddr(ifpub, ifp, true); 4383 in6_ifa_put(ifpub); 4384 in6_ifa_put(ifp); 4385 rcu_read_lock_bh(); 4386 goto restart; 4387 } 4388 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4389 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4390 spin_unlock(&ifp->lock); 4391 } else { 4392 /* ifp->prefered_lft <= ifp->valid_lft */ 4393 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4394 next = ifp->tstamp + ifp->prefered_lft * HZ; 4395 spin_unlock(&ifp->lock); 4396 } 4397 } 4398 } 4399 4400 next_sec = round_jiffies_up(next); 4401 next_sched = next; 4402 4403 /* If rounded timeout is accurate enough, accept it. */ 4404 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4405 next_sched = next_sec; 4406 4407 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4408 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4409 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4410 4411 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4412 now, next, next_sec, next_sched); 4413 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4414 rcu_read_unlock_bh(); 4415 } 4416 4417 static void addrconf_verify_work(struct work_struct *w) 4418 { 4419 rtnl_lock(); 4420 addrconf_verify_rtnl(); 4421 rtnl_unlock(); 4422 } 4423 4424 static void addrconf_verify(void) 4425 { 4426 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4427 } 4428 4429 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4430 struct in6_addr **peer_pfx) 4431 { 4432 struct in6_addr *pfx = NULL; 4433 4434 *peer_pfx = NULL; 4435 4436 if (addr) 4437 pfx = nla_data(addr); 4438 4439 if (local) { 4440 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4441 *peer_pfx = pfx; 4442 pfx = nla_data(local); 4443 } 4444 4445 return pfx; 4446 } 4447 4448 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4449 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4450 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4451 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4452 [IFA_FLAGS] = { .len = sizeof(u32) }, 4453 }; 4454 4455 static int 4456 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4457 struct netlink_ext_ack *extack) 4458 { 4459 struct net *net = sock_net(skb->sk); 4460 struct ifaddrmsg *ifm; 4461 struct nlattr *tb[IFA_MAX+1]; 4462 struct in6_addr *pfx, *peer_pfx; 4463 u32 ifa_flags; 4464 int err; 4465 4466 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4467 extack); 4468 if (err < 0) 4469 return err; 4470 4471 ifm = nlmsg_data(nlh); 4472 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4473 if (!pfx) 4474 return -EINVAL; 4475 4476 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4477 4478 /* We ignore other flags so far. */ 4479 ifa_flags &= IFA_F_MANAGETEMPADDR; 4480 4481 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4482 ifm->ifa_prefixlen); 4483 } 4484 4485 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4486 u32 prefered_lft, u32 valid_lft) 4487 { 4488 u32 flags; 4489 clock_t expires; 4490 unsigned long timeout; 4491 bool was_managetempaddr; 4492 bool had_prefixroute; 4493 4494 ASSERT_RTNL(); 4495 4496 if (!valid_lft || (prefered_lft > valid_lft)) 4497 return -EINVAL; 4498 4499 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4500 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4501 return -EINVAL; 4502 4503 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4504 if (addrconf_finite_timeout(timeout)) { 4505 expires = jiffies_to_clock_t(timeout * HZ); 4506 valid_lft = timeout; 4507 flags = RTF_EXPIRES; 4508 } else { 4509 expires = 0; 4510 flags = 0; 4511 ifa_flags |= IFA_F_PERMANENT; 4512 } 4513 4514 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4515 if (addrconf_finite_timeout(timeout)) { 4516 if (timeout == 0) 4517 ifa_flags |= IFA_F_DEPRECATED; 4518 prefered_lft = timeout; 4519 } 4520 4521 spin_lock_bh(&ifp->lock); 4522 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4523 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4524 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4525 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4526 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4527 IFA_F_NOPREFIXROUTE); 4528 ifp->flags |= ifa_flags; 4529 ifp->tstamp = jiffies; 4530 ifp->valid_lft = valid_lft; 4531 ifp->prefered_lft = prefered_lft; 4532 4533 spin_unlock_bh(&ifp->lock); 4534 if (!(ifp->flags&IFA_F_TENTATIVE)) 4535 ipv6_ifa_notify(0, ifp); 4536 4537 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4538 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4539 expires, flags); 4540 } else if (had_prefixroute) { 4541 enum cleanup_prefix_rt_t action; 4542 unsigned long rt_expires; 4543 4544 write_lock_bh(&ifp->idev->lock); 4545 action = check_cleanup_prefix_route(ifp, &rt_expires); 4546 write_unlock_bh(&ifp->idev->lock); 4547 4548 if (action != CLEANUP_PREFIX_RT_NOP) { 4549 cleanup_prefix_route(ifp, rt_expires, 4550 action == CLEANUP_PREFIX_RT_DEL); 4551 } 4552 } 4553 4554 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4555 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4556 valid_lft = prefered_lft = 0; 4557 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4558 !was_managetempaddr, jiffies); 4559 } 4560 4561 addrconf_verify_rtnl(); 4562 4563 return 0; 4564 } 4565 4566 static int 4567 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4568 struct netlink_ext_ack *extack) 4569 { 4570 struct net *net = sock_net(skb->sk); 4571 struct ifaddrmsg *ifm; 4572 struct nlattr *tb[IFA_MAX+1]; 4573 struct in6_addr *pfx, *peer_pfx; 4574 struct inet6_ifaddr *ifa; 4575 struct net_device *dev; 4576 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4577 u32 ifa_flags; 4578 int err; 4579 4580 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4581 extack); 4582 if (err < 0) 4583 return err; 4584 4585 ifm = nlmsg_data(nlh); 4586 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4587 if (!pfx) 4588 return -EINVAL; 4589 4590 if (tb[IFA_CACHEINFO]) { 4591 struct ifa_cacheinfo *ci; 4592 4593 ci = nla_data(tb[IFA_CACHEINFO]); 4594 valid_lft = ci->ifa_valid; 4595 preferred_lft = ci->ifa_prefered; 4596 } else { 4597 preferred_lft = INFINITY_LIFE_TIME; 4598 valid_lft = INFINITY_LIFE_TIME; 4599 } 4600 4601 dev = __dev_get_by_index(net, ifm->ifa_index); 4602 if (!dev) 4603 return -ENODEV; 4604 4605 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4606 4607 /* We ignore other flags so far. */ 4608 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4609 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4610 4611 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4612 if (!ifa) { 4613 /* 4614 * It would be best to check for !NLM_F_CREATE here but 4615 * userspace already relies on not having to provide this. 4616 */ 4617 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4618 ifm->ifa_prefixlen, ifa_flags, 4619 preferred_lft, valid_lft, extack); 4620 } 4621 4622 if (nlh->nlmsg_flags & NLM_F_EXCL || 4623 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4624 err = -EEXIST; 4625 else 4626 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4627 4628 in6_ifa_put(ifa); 4629 4630 return err; 4631 } 4632 4633 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4634 u8 scope, int ifindex) 4635 { 4636 struct ifaddrmsg *ifm; 4637 4638 ifm = nlmsg_data(nlh); 4639 ifm->ifa_family = AF_INET6; 4640 ifm->ifa_prefixlen = prefixlen; 4641 ifm->ifa_flags = flags; 4642 ifm->ifa_scope = scope; 4643 ifm->ifa_index = ifindex; 4644 } 4645 4646 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4647 unsigned long tstamp, u32 preferred, u32 valid) 4648 { 4649 struct ifa_cacheinfo ci; 4650 4651 ci.cstamp = cstamp_delta(cstamp); 4652 ci.tstamp = cstamp_delta(tstamp); 4653 ci.ifa_prefered = preferred; 4654 ci.ifa_valid = valid; 4655 4656 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4657 } 4658 4659 static inline int rt_scope(int ifa_scope) 4660 { 4661 if (ifa_scope & IFA_HOST) 4662 return RT_SCOPE_HOST; 4663 else if (ifa_scope & IFA_LINK) 4664 return RT_SCOPE_LINK; 4665 else if (ifa_scope & IFA_SITE) 4666 return RT_SCOPE_SITE; 4667 else 4668 return RT_SCOPE_UNIVERSE; 4669 } 4670 4671 static inline int inet6_ifaddr_msgsize(void) 4672 { 4673 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4674 + nla_total_size(16) /* IFA_LOCAL */ 4675 + nla_total_size(16) /* IFA_ADDRESS */ 4676 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4677 + nla_total_size(4) /* IFA_FLAGS */; 4678 } 4679 4680 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4681 u32 portid, u32 seq, int event, unsigned int flags) 4682 { 4683 struct nlmsghdr *nlh; 4684 u32 preferred, valid; 4685 4686 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4687 if (!nlh) 4688 return -EMSGSIZE; 4689 4690 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4691 ifa->idev->dev->ifindex); 4692 4693 if (!((ifa->flags&IFA_F_PERMANENT) && 4694 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4695 preferred = ifa->prefered_lft; 4696 valid = ifa->valid_lft; 4697 if (preferred != INFINITY_LIFE_TIME) { 4698 long tval = (jiffies - ifa->tstamp)/HZ; 4699 if (preferred > tval) 4700 preferred -= tval; 4701 else 4702 preferred = 0; 4703 if (valid != INFINITY_LIFE_TIME) { 4704 if (valid > tval) 4705 valid -= tval; 4706 else 4707 valid = 0; 4708 } 4709 } 4710 } else { 4711 preferred = INFINITY_LIFE_TIME; 4712 valid = INFINITY_LIFE_TIME; 4713 } 4714 4715 if (!ipv6_addr_any(&ifa->peer_addr)) { 4716 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4717 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4718 goto error; 4719 } else 4720 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4721 goto error; 4722 4723 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4724 goto error; 4725 4726 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4727 goto error; 4728 4729 nlmsg_end(skb, nlh); 4730 return 0; 4731 4732 error: 4733 nlmsg_cancel(skb, nlh); 4734 return -EMSGSIZE; 4735 } 4736 4737 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4738 u32 portid, u32 seq, int event, u16 flags) 4739 { 4740 struct nlmsghdr *nlh; 4741 u8 scope = RT_SCOPE_UNIVERSE; 4742 int ifindex = ifmca->idev->dev->ifindex; 4743 4744 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4745 scope = RT_SCOPE_SITE; 4746 4747 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4748 if (!nlh) 4749 return -EMSGSIZE; 4750 4751 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4752 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4753 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4754 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4755 nlmsg_cancel(skb, nlh); 4756 return -EMSGSIZE; 4757 } 4758 4759 nlmsg_end(skb, nlh); 4760 return 0; 4761 } 4762 4763 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4764 u32 portid, u32 seq, int event, unsigned int flags) 4765 { 4766 struct nlmsghdr *nlh; 4767 u8 scope = RT_SCOPE_UNIVERSE; 4768 int ifindex = ifaca->aca_idev->dev->ifindex; 4769 4770 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4771 scope = RT_SCOPE_SITE; 4772 4773 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4774 if (!nlh) 4775 return -EMSGSIZE; 4776 4777 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4778 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4779 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4780 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4781 nlmsg_cancel(skb, nlh); 4782 return -EMSGSIZE; 4783 } 4784 4785 nlmsg_end(skb, nlh); 4786 return 0; 4787 } 4788 4789 enum addr_type_t { 4790 UNICAST_ADDR, 4791 MULTICAST_ADDR, 4792 ANYCAST_ADDR, 4793 }; 4794 4795 /* called with rcu_read_lock() */ 4796 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4797 struct netlink_callback *cb, enum addr_type_t type, 4798 int s_ip_idx, int *p_ip_idx) 4799 { 4800 struct ifmcaddr6 *ifmca; 4801 struct ifacaddr6 *ifaca; 4802 int err = 1; 4803 int ip_idx = *p_ip_idx; 4804 4805 read_lock_bh(&idev->lock); 4806 switch (type) { 4807 case UNICAST_ADDR: { 4808 struct inet6_ifaddr *ifa; 4809 4810 /* unicast address incl. temp addr */ 4811 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4812 if (++ip_idx < s_ip_idx) 4813 continue; 4814 err = inet6_fill_ifaddr(skb, ifa, 4815 NETLINK_CB(cb->skb).portid, 4816 cb->nlh->nlmsg_seq, 4817 RTM_NEWADDR, 4818 NLM_F_MULTI); 4819 if (err < 0) 4820 break; 4821 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4822 } 4823 break; 4824 } 4825 case MULTICAST_ADDR: 4826 /* multicast address */ 4827 for (ifmca = idev->mc_list; ifmca; 4828 ifmca = ifmca->next, ip_idx++) { 4829 if (ip_idx < s_ip_idx) 4830 continue; 4831 err = inet6_fill_ifmcaddr(skb, ifmca, 4832 NETLINK_CB(cb->skb).portid, 4833 cb->nlh->nlmsg_seq, 4834 RTM_GETMULTICAST, 4835 NLM_F_MULTI); 4836 if (err < 0) 4837 break; 4838 } 4839 break; 4840 case ANYCAST_ADDR: 4841 /* anycast address */ 4842 for (ifaca = idev->ac_list; ifaca; 4843 ifaca = ifaca->aca_next, ip_idx++) { 4844 if (ip_idx < s_ip_idx) 4845 continue; 4846 err = inet6_fill_ifacaddr(skb, ifaca, 4847 NETLINK_CB(cb->skb).portid, 4848 cb->nlh->nlmsg_seq, 4849 RTM_GETANYCAST, 4850 NLM_F_MULTI); 4851 if (err < 0) 4852 break; 4853 } 4854 break; 4855 default: 4856 break; 4857 } 4858 read_unlock_bh(&idev->lock); 4859 *p_ip_idx = ip_idx; 4860 return err; 4861 } 4862 4863 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4864 enum addr_type_t type) 4865 { 4866 struct net *net = sock_net(skb->sk); 4867 int h, s_h; 4868 int idx, ip_idx; 4869 int s_idx, s_ip_idx; 4870 struct net_device *dev; 4871 struct inet6_dev *idev; 4872 struct hlist_head *head; 4873 4874 s_h = cb->args[0]; 4875 s_idx = idx = cb->args[1]; 4876 s_ip_idx = ip_idx = cb->args[2]; 4877 4878 rcu_read_lock(); 4879 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4880 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4881 idx = 0; 4882 head = &net->dev_index_head[h]; 4883 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4884 if (idx < s_idx) 4885 goto cont; 4886 if (h > s_h || idx > s_idx) 4887 s_ip_idx = 0; 4888 ip_idx = 0; 4889 idev = __in6_dev_get(dev); 4890 if (!idev) 4891 goto cont; 4892 4893 if (in6_dump_addrs(idev, skb, cb, type, 4894 s_ip_idx, &ip_idx) < 0) 4895 goto done; 4896 cont: 4897 idx++; 4898 } 4899 } 4900 done: 4901 rcu_read_unlock(); 4902 cb->args[0] = h; 4903 cb->args[1] = idx; 4904 cb->args[2] = ip_idx; 4905 4906 return skb->len; 4907 } 4908 4909 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4910 { 4911 enum addr_type_t type = UNICAST_ADDR; 4912 4913 return inet6_dump_addr(skb, cb, type); 4914 } 4915 4916 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4917 { 4918 enum addr_type_t type = MULTICAST_ADDR; 4919 4920 return inet6_dump_addr(skb, cb, type); 4921 } 4922 4923 4924 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4925 { 4926 enum addr_type_t type = ANYCAST_ADDR; 4927 4928 return inet6_dump_addr(skb, cb, type); 4929 } 4930 4931 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4932 struct netlink_ext_ack *extack) 4933 { 4934 struct net *net = sock_net(in_skb->sk); 4935 struct ifaddrmsg *ifm; 4936 struct nlattr *tb[IFA_MAX+1]; 4937 struct in6_addr *addr = NULL, *peer; 4938 struct net_device *dev = NULL; 4939 struct inet6_ifaddr *ifa; 4940 struct sk_buff *skb; 4941 int err; 4942 4943 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4944 extack); 4945 if (err < 0) 4946 return err; 4947 4948 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4949 if (!addr) 4950 return -EINVAL; 4951 4952 ifm = nlmsg_data(nlh); 4953 if (ifm->ifa_index) 4954 dev = dev_get_by_index(net, ifm->ifa_index); 4955 4956 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4957 if (!ifa) { 4958 err = -EADDRNOTAVAIL; 4959 goto errout; 4960 } 4961 4962 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4963 if (!skb) { 4964 err = -ENOBUFS; 4965 goto errout_ifa; 4966 } 4967 4968 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4969 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4970 if (err < 0) { 4971 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4972 WARN_ON(err == -EMSGSIZE); 4973 kfree_skb(skb); 4974 goto errout_ifa; 4975 } 4976 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4977 errout_ifa: 4978 in6_ifa_put(ifa); 4979 errout: 4980 if (dev) 4981 dev_put(dev); 4982 return err; 4983 } 4984 4985 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4986 { 4987 struct sk_buff *skb; 4988 struct net *net = dev_net(ifa->idev->dev); 4989 int err = -ENOBUFS; 4990 4991 /* Don't send DELADDR notification for TENTATIVE address, 4992 * since NEWADDR notification is sent only after removing 4993 * TENTATIVE flag, if DAD has not failed. 4994 */ 4995 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4996 event == RTM_DELADDR) 4997 return; 4998 4999 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5000 if (!skb) 5001 goto errout; 5002 5003 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5004 if (err < 0) { 5005 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5006 WARN_ON(err == -EMSGSIZE); 5007 kfree_skb(skb); 5008 goto errout; 5009 } 5010 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5011 return; 5012 errout: 5013 if (err < 0) 5014 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5015 } 5016 5017 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5018 __s32 *array, int bytes) 5019 { 5020 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5021 5022 memset(array, 0, bytes); 5023 array[DEVCONF_FORWARDING] = cnf->forwarding; 5024 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5025 array[DEVCONF_MTU6] = cnf->mtu6; 5026 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5027 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5028 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5029 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5030 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5031 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5032 jiffies_to_msecs(cnf->rtr_solicit_interval); 5033 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5034 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5035 array[DEVCONF_RTR_SOLICIT_DELAY] = 5036 jiffies_to_msecs(cnf->rtr_solicit_delay); 5037 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5038 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5039 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5040 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5041 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5042 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5043 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5044 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5045 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5046 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5047 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5048 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5049 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5050 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5051 #ifdef CONFIG_IPV6_ROUTER_PREF 5052 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5053 array[DEVCONF_RTR_PROBE_INTERVAL] = 5054 jiffies_to_msecs(cnf->rtr_probe_interval); 5055 #ifdef CONFIG_IPV6_ROUTE_INFO 5056 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5057 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5058 #endif 5059 #endif 5060 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5061 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5062 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5063 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5064 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5065 #endif 5066 #ifdef CONFIG_IPV6_MROUTE 5067 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5068 #endif 5069 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5070 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5071 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5072 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5073 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5074 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5075 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5076 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5077 /* we omit DEVCONF_STABLE_SECRET for now */ 5078 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5079 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5080 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5081 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5082 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5083 #ifdef CONFIG_IPV6_SEG6_HMAC 5084 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5085 #endif 5086 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5087 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5088 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5089 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5090 } 5091 5092 static inline size_t inet6_ifla6_size(void) 5093 { 5094 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5095 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5096 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5097 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5098 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5099 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5100 } 5101 5102 static inline size_t inet6_if_nlmsg_size(void) 5103 { 5104 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5105 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5106 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5107 + nla_total_size(4) /* IFLA_MTU */ 5108 + nla_total_size(4) /* IFLA_LINK */ 5109 + nla_total_size(1) /* IFLA_OPERSTATE */ 5110 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5111 } 5112 5113 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5114 int bytes) 5115 { 5116 int i; 5117 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5118 BUG_ON(pad < 0); 5119 5120 /* Use put_unaligned() because stats may not be aligned for u64. */ 5121 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5122 for (i = 1; i < ICMP6_MIB_MAX; i++) 5123 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5124 5125 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5126 } 5127 5128 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5129 int bytes, size_t syncpoff) 5130 { 5131 int i, c; 5132 u64 buff[IPSTATS_MIB_MAX]; 5133 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5134 5135 BUG_ON(pad < 0); 5136 5137 memset(buff, 0, sizeof(buff)); 5138 buff[0] = IPSTATS_MIB_MAX; 5139 5140 for_each_possible_cpu(c) { 5141 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5142 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5143 } 5144 5145 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5146 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5147 } 5148 5149 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5150 int bytes) 5151 { 5152 switch (attrtype) { 5153 case IFLA_INET6_STATS: 5154 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5155 offsetof(struct ipstats_mib, syncp)); 5156 break; 5157 case IFLA_INET6_ICMP6STATS: 5158 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5159 break; 5160 } 5161 } 5162 5163 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5164 u32 ext_filter_mask) 5165 { 5166 struct nlattr *nla; 5167 struct ifla_cacheinfo ci; 5168 5169 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5170 goto nla_put_failure; 5171 ci.max_reasm_len = IPV6_MAXPLEN; 5172 ci.tstamp = cstamp_delta(idev->tstamp); 5173 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5174 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5175 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5176 goto nla_put_failure; 5177 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5178 if (!nla) 5179 goto nla_put_failure; 5180 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5181 5182 /* XXX - MC not implemented */ 5183 5184 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5185 return 0; 5186 5187 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5188 if (!nla) 5189 goto nla_put_failure; 5190 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5191 5192 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5193 if (!nla) 5194 goto nla_put_failure; 5195 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5196 5197 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5198 if (!nla) 5199 goto nla_put_failure; 5200 5201 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5202 goto nla_put_failure; 5203 5204 read_lock_bh(&idev->lock); 5205 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5206 read_unlock_bh(&idev->lock); 5207 5208 return 0; 5209 5210 nla_put_failure: 5211 return -EMSGSIZE; 5212 } 5213 5214 static size_t inet6_get_link_af_size(const struct net_device *dev, 5215 u32 ext_filter_mask) 5216 { 5217 if (!__in6_dev_get(dev)) 5218 return 0; 5219 5220 return inet6_ifla6_size(); 5221 } 5222 5223 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5224 u32 ext_filter_mask) 5225 { 5226 struct inet6_dev *idev = __in6_dev_get(dev); 5227 5228 if (!idev) 5229 return -ENODATA; 5230 5231 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5232 return -EMSGSIZE; 5233 5234 return 0; 5235 } 5236 5237 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5238 { 5239 struct inet6_ifaddr *ifp; 5240 struct net_device *dev = idev->dev; 5241 bool clear_token, update_rs = false; 5242 struct in6_addr ll_addr; 5243 5244 ASSERT_RTNL(); 5245 5246 if (!token) 5247 return -EINVAL; 5248 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5249 return -EINVAL; 5250 if (!ipv6_accept_ra(idev)) 5251 return -EINVAL; 5252 if (idev->cnf.rtr_solicits == 0) 5253 return -EINVAL; 5254 5255 write_lock_bh(&idev->lock); 5256 5257 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5258 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5259 5260 write_unlock_bh(&idev->lock); 5261 5262 clear_token = ipv6_addr_any(token); 5263 if (clear_token) 5264 goto update_lft; 5265 5266 if (!idev->dead && (idev->if_flags & IF_READY) && 5267 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5268 IFA_F_OPTIMISTIC)) { 5269 /* If we're not ready, then normal ifup will take care 5270 * of this. Otherwise, we need to request our rs here. 5271 */ 5272 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5273 update_rs = true; 5274 } 5275 5276 update_lft: 5277 write_lock_bh(&idev->lock); 5278 5279 if (update_rs) { 5280 idev->if_flags |= IF_RS_SENT; 5281 idev->rs_interval = rfc3315_s14_backoff_init( 5282 idev->cnf.rtr_solicit_interval); 5283 idev->rs_probes = 1; 5284 addrconf_mod_rs_timer(idev, idev->rs_interval); 5285 } 5286 5287 /* Well, that's kinda nasty ... */ 5288 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5289 spin_lock(&ifp->lock); 5290 if (ifp->tokenized) { 5291 ifp->valid_lft = 0; 5292 ifp->prefered_lft = 0; 5293 } 5294 spin_unlock(&ifp->lock); 5295 } 5296 5297 write_unlock_bh(&idev->lock); 5298 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5299 addrconf_verify_rtnl(); 5300 return 0; 5301 } 5302 5303 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5304 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5305 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5306 }; 5307 5308 static int inet6_validate_link_af(const struct net_device *dev, 5309 const struct nlattr *nla) 5310 { 5311 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5312 5313 if (dev && !__in6_dev_get(dev)) 5314 return -EAFNOSUPPORT; 5315 5316 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5317 NULL); 5318 } 5319 5320 static int check_addr_gen_mode(int mode) 5321 { 5322 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5323 mode != IN6_ADDR_GEN_MODE_NONE && 5324 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5325 mode != IN6_ADDR_GEN_MODE_RANDOM) 5326 return -EINVAL; 5327 return 1; 5328 } 5329 5330 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5331 int mode) 5332 { 5333 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5334 !idev->cnf.stable_secret.initialized && 5335 !net->ipv6.devconf_dflt->stable_secret.initialized) 5336 return -EINVAL; 5337 return 1; 5338 } 5339 5340 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5341 { 5342 int err = -EINVAL; 5343 struct inet6_dev *idev = __in6_dev_get(dev); 5344 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5345 5346 if (!idev) 5347 return -EAFNOSUPPORT; 5348 5349 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5350 BUG(); 5351 5352 if (tb[IFLA_INET6_TOKEN]) { 5353 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5354 if (err) 5355 return err; 5356 } 5357 5358 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5359 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5360 5361 if (check_addr_gen_mode(mode) < 0 || 5362 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5363 return -EINVAL; 5364 5365 idev->cnf.addr_gen_mode = mode; 5366 err = 0; 5367 } 5368 5369 return err; 5370 } 5371 5372 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5373 u32 portid, u32 seq, int event, unsigned int flags) 5374 { 5375 struct net_device *dev = idev->dev; 5376 struct ifinfomsg *hdr; 5377 struct nlmsghdr *nlh; 5378 void *protoinfo; 5379 5380 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5381 if (!nlh) 5382 return -EMSGSIZE; 5383 5384 hdr = nlmsg_data(nlh); 5385 hdr->ifi_family = AF_INET6; 5386 hdr->__ifi_pad = 0; 5387 hdr->ifi_type = dev->type; 5388 hdr->ifi_index = dev->ifindex; 5389 hdr->ifi_flags = dev_get_flags(dev); 5390 hdr->ifi_change = 0; 5391 5392 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5393 (dev->addr_len && 5394 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5395 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5396 (dev->ifindex != dev_get_iflink(dev) && 5397 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5398 nla_put_u8(skb, IFLA_OPERSTATE, 5399 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5400 goto nla_put_failure; 5401 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5402 if (!protoinfo) 5403 goto nla_put_failure; 5404 5405 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5406 goto nla_put_failure; 5407 5408 nla_nest_end(skb, protoinfo); 5409 nlmsg_end(skb, nlh); 5410 return 0; 5411 5412 nla_put_failure: 5413 nlmsg_cancel(skb, nlh); 5414 return -EMSGSIZE; 5415 } 5416 5417 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5418 { 5419 struct net *net = sock_net(skb->sk); 5420 int h, s_h; 5421 int idx = 0, s_idx; 5422 struct net_device *dev; 5423 struct inet6_dev *idev; 5424 struct hlist_head *head; 5425 5426 s_h = cb->args[0]; 5427 s_idx = cb->args[1]; 5428 5429 rcu_read_lock(); 5430 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5431 idx = 0; 5432 head = &net->dev_index_head[h]; 5433 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5434 if (idx < s_idx) 5435 goto cont; 5436 idev = __in6_dev_get(dev); 5437 if (!idev) 5438 goto cont; 5439 if (inet6_fill_ifinfo(skb, idev, 5440 NETLINK_CB(cb->skb).portid, 5441 cb->nlh->nlmsg_seq, 5442 RTM_NEWLINK, NLM_F_MULTI) < 0) 5443 goto out; 5444 cont: 5445 idx++; 5446 } 5447 } 5448 out: 5449 rcu_read_unlock(); 5450 cb->args[1] = idx; 5451 cb->args[0] = h; 5452 5453 return skb->len; 5454 } 5455 5456 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5457 { 5458 struct sk_buff *skb; 5459 struct net *net = dev_net(idev->dev); 5460 int err = -ENOBUFS; 5461 5462 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5463 if (!skb) 5464 goto errout; 5465 5466 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5467 if (err < 0) { 5468 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5469 WARN_ON(err == -EMSGSIZE); 5470 kfree_skb(skb); 5471 goto errout; 5472 } 5473 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5474 return; 5475 errout: 5476 if (err < 0) 5477 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5478 } 5479 5480 static inline size_t inet6_prefix_nlmsg_size(void) 5481 { 5482 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5483 + nla_total_size(sizeof(struct in6_addr)) 5484 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5485 } 5486 5487 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5488 struct prefix_info *pinfo, u32 portid, u32 seq, 5489 int event, unsigned int flags) 5490 { 5491 struct prefixmsg *pmsg; 5492 struct nlmsghdr *nlh; 5493 struct prefix_cacheinfo ci; 5494 5495 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5496 if (!nlh) 5497 return -EMSGSIZE; 5498 5499 pmsg = nlmsg_data(nlh); 5500 pmsg->prefix_family = AF_INET6; 5501 pmsg->prefix_pad1 = 0; 5502 pmsg->prefix_pad2 = 0; 5503 pmsg->prefix_ifindex = idev->dev->ifindex; 5504 pmsg->prefix_len = pinfo->prefix_len; 5505 pmsg->prefix_type = pinfo->type; 5506 pmsg->prefix_pad3 = 0; 5507 pmsg->prefix_flags = 0; 5508 if (pinfo->onlink) 5509 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5510 if (pinfo->autoconf) 5511 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5512 5513 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5514 goto nla_put_failure; 5515 ci.preferred_time = ntohl(pinfo->prefered); 5516 ci.valid_time = ntohl(pinfo->valid); 5517 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5518 goto nla_put_failure; 5519 nlmsg_end(skb, nlh); 5520 return 0; 5521 5522 nla_put_failure: 5523 nlmsg_cancel(skb, nlh); 5524 return -EMSGSIZE; 5525 } 5526 5527 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5528 struct prefix_info *pinfo) 5529 { 5530 struct sk_buff *skb; 5531 struct net *net = dev_net(idev->dev); 5532 int err = -ENOBUFS; 5533 5534 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5535 if (!skb) 5536 goto errout; 5537 5538 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5539 if (err < 0) { 5540 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5541 WARN_ON(err == -EMSGSIZE); 5542 kfree_skb(skb); 5543 goto errout; 5544 } 5545 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5546 return; 5547 errout: 5548 if (err < 0) 5549 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5550 } 5551 5552 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5553 { 5554 struct net *net = dev_net(ifp->idev->dev); 5555 5556 if (event) 5557 ASSERT_RTNL(); 5558 5559 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5560 5561 switch (event) { 5562 case RTM_NEWADDR: 5563 /* 5564 * If the address was optimistic 5565 * we inserted the route at the start of 5566 * our DAD process, so we don't need 5567 * to do it again 5568 */ 5569 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5570 ip6_ins_rt(ifp->rt); 5571 if (ifp->idev->cnf.forwarding) 5572 addrconf_join_anycast(ifp); 5573 if (!ipv6_addr_any(&ifp->peer_addr)) 5574 addrconf_prefix_route(&ifp->peer_addr, 128, 5575 ifp->idev->dev, 0, 0); 5576 break; 5577 case RTM_DELADDR: 5578 if (ifp->idev->cnf.forwarding) 5579 addrconf_leave_anycast(ifp); 5580 addrconf_leave_solict(ifp->idev, &ifp->addr); 5581 if (!ipv6_addr_any(&ifp->peer_addr)) { 5582 struct rt6_info *rt; 5583 5584 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5585 ifp->idev->dev, 0, 0); 5586 if (rt) 5587 ip6_del_rt(rt); 5588 } 5589 if (ifp->rt) { 5590 if (dst_hold_safe(&ifp->rt->dst)) 5591 ip6_del_rt(ifp->rt); 5592 } 5593 rt_genid_bump_ipv6(net); 5594 break; 5595 } 5596 atomic_inc(&net->ipv6.dev_addr_genid); 5597 } 5598 5599 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5600 { 5601 rcu_read_lock_bh(); 5602 if (likely(ifp->idev->dead == 0)) 5603 __ipv6_ifa_notify(event, ifp); 5604 rcu_read_unlock_bh(); 5605 } 5606 5607 #ifdef CONFIG_SYSCTL 5608 5609 static 5610 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5611 void __user *buffer, size_t *lenp, loff_t *ppos) 5612 { 5613 int *valp = ctl->data; 5614 int val = *valp; 5615 loff_t pos = *ppos; 5616 struct ctl_table lctl; 5617 int ret; 5618 5619 /* 5620 * ctl->data points to idev->cnf.forwarding, we should 5621 * not modify it until we get the rtnl lock. 5622 */ 5623 lctl = *ctl; 5624 lctl.data = &val; 5625 5626 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5627 5628 if (write) 5629 ret = addrconf_fixup_forwarding(ctl, valp, val); 5630 if (ret) 5631 *ppos = pos; 5632 return ret; 5633 } 5634 5635 static 5636 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5637 void __user *buffer, size_t *lenp, loff_t *ppos) 5638 { 5639 struct inet6_dev *idev = ctl->extra1; 5640 int min_mtu = IPV6_MIN_MTU; 5641 struct ctl_table lctl; 5642 5643 lctl = *ctl; 5644 lctl.extra1 = &min_mtu; 5645 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5646 5647 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5648 } 5649 5650 static void dev_disable_change(struct inet6_dev *idev) 5651 { 5652 struct netdev_notifier_info info; 5653 5654 if (!idev || !idev->dev) 5655 return; 5656 5657 netdev_notifier_info_init(&info, idev->dev); 5658 if (idev->cnf.disable_ipv6) 5659 addrconf_notify(NULL, NETDEV_DOWN, &info); 5660 else 5661 addrconf_notify(NULL, NETDEV_UP, &info); 5662 } 5663 5664 static void addrconf_disable_change(struct net *net, __s32 newf) 5665 { 5666 struct net_device *dev; 5667 struct inet6_dev *idev; 5668 5669 for_each_netdev(net, dev) { 5670 idev = __in6_dev_get(dev); 5671 if (idev) { 5672 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5673 idev->cnf.disable_ipv6 = newf; 5674 if (changed) 5675 dev_disable_change(idev); 5676 } 5677 } 5678 } 5679 5680 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5681 { 5682 struct net *net; 5683 int old; 5684 5685 if (!rtnl_trylock()) 5686 return restart_syscall(); 5687 5688 net = (struct net *)table->extra2; 5689 old = *p; 5690 *p = newf; 5691 5692 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5693 rtnl_unlock(); 5694 return 0; 5695 } 5696 5697 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5698 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5699 addrconf_disable_change(net, newf); 5700 } else if ((!newf) ^ (!old)) 5701 dev_disable_change((struct inet6_dev *)table->extra1); 5702 5703 rtnl_unlock(); 5704 return 0; 5705 } 5706 5707 static 5708 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5709 void __user *buffer, size_t *lenp, loff_t *ppos) 5710 { 5711 int *valp = ctl->data; 5712 int val = *valp; 5713 loff_t pos = *ppos; 5714 struct ctl_table lctl; 5715 int ret; 5716 5717 /* 5718 * ctl->data points to idev->cnf.disable_ipv6, we should 5719 * not modify it until we get the rtnl lock. 5720 */ 5721 lctl = *ctl; 5722 lctl.data = &val; 5723 5724 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5725 5726 if (write) 5727 ret = addrconf_disable_ipv6(ctl, valp, val); 5728 if (ret) 5729 *ppos = pos; 5730 return ret; 5731 } 5732 5733 static 5734 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5735 void __user *buffer, size_t *lenp, loff_t *ppos) 5736 { 5737 int *valp = ctl->data; 5738 int ret; 5739 int old, new; 5740 5741 old = *valp; 5742 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5743 new = *valp; 5744 5745 if (write && old != new) { 5746 struct net *net = ctl->extra2; 5747 5748 if (!rtnl_trylock()) 5749 return restart_syscall(); 5750 5751 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5752 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5753 NETCONFA_PROXY_NEIGH, 5754 NETCONFA_IFINDEX_DEFAULT, 5755 net->ipv6.devconf_dflt); 5756 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5757 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5758 NETCONFA_PROXY_NEIGH, 5759 NETCONFA_IFINDEX_ALL, 5760 net->ipv6.devconf_all); 5761 else { 5762 struct inet6_dev *idev = ctl->extra1; 5763 5764 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5765 NETCONFA_PROXY_NEIGH, 5766 idev->dev->ifindex, 5767 &idev->cnf); 5768 } 5769 rtnl_unlock(); 5770 } 5771 5772 return ret; 5773 } 5774 5775 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5776 void __user *buffer, size_t *lenp, 5777 loff_t *ppos) 5778 { 5779 int ret = 0; 5780 int new_val; 5781 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5782 struct net *net = (struct net *)ctl->extra2; 5783 5784 if (!rtnl_trylock()) 5785 return restart_syscall(); 5786 5787 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5788 5789 if (write) { 5790 new_val = *((int *)ctl->data); 5791 5792 if (check_addr_gen_mode(new_val) < 0) { 5793 ret = -EINVAL; 5794 goto out; 5795 } 5796 5797 /* request for default */ 5798 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5799 ipv6_devconf_dflt.addr_gen_mode = new_val; 5800 5801 /* request for individual net device */ 5802 } else { 5803 if (!idev) 5804 goto out; 5805 5806 if (check_stable_privacy(idev, net, new_val) < 0) { 5807 ret = -EINVAL; 5808 goto out; 5809 } 5810 5811 if (idev->cnf.addr_gen_mode != new_val) { 5812 idev->cnf.addr_gen_mode = new_val; 5813 addrconf_dev_config(idev->dev); 5814 } 5815 } 5816 } 5817 5818 out: 5819 rtnl_unlock(); 5820 5821 return ret; 5822 } 5823 5824 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5825 void __user *buffer, size_t *lenp, 5826 loff_t *ppos) 5827 { 5828 int err; 5829 struct in6_addr addr; 5830 char str[IPV6_MAX_STRLEN]; 5831 struct ctl_table lctl = *ctl; 5832 struct net *net = ctl->extra2; 5833 struct ipv6_stable_secret *secret = ctl->data; 5834 5835 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5836 return -EIO; 5837 5838 lctl.maxlen = IPV6_MAX_STRLEN; 5839 lctl.data = str; 5840 5841 if (!rtnl_trylock()) 5842 return restart_syscall(); 5843 5844 if (!write && !secret->initialized) { 5845 err = -EIO; 5846 goto out; 5847 } 5848 5849 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5850 if (err >= sizeof(str)) { 5851 err = -EIO; 5852 goto out; 5853 } 5854 5855 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5856 if (err || !write) 5857 goto out; 5858 5859 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5860 err = -EIO; 5861 goto out; 5862 } 5863 5864 secret->initialized = true; 5865 secret->secret = addr; 5866 5867 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5868 struct net_device *dev; 5869 5870 for_each_netdev(net, dev) { 5871 struct inet6_dev *idev = __in6_dev_get(dev); 5872 5873 if (idev) { 5874 idev->cnf.addr_gen_mode = 5875 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5876 } 5877 } 5878 } else { 5879 struct inet6_dev *idev = ctl->extra1; 5880 5881 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5882 } 5883 5884 out: 5885 rtnl_unlock(); 5886 5887 return err; 5888 } 5889 5890 static 5891 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5892 int write, 5893 void __user *buffer, 5894 size_t *lenp, 5895 loff_t *ppos) 5896 { 5897 int *valp = ctl->data; 5898 int val = *valp; 5899 loff_t pos = *ppos; 5900 struct ctl_table lctl; 5901 int ret; 5902 5903 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5904 * we should not modify it until we get the rtnl lock. 5905 */ 5906 lctl = *ctl; 5907 lctl.data = &val; 5908 5909 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5910 5911 if (write) 5912 ret = addrconf_fixup_linkdown(ctl, valp, val); 5913 if (ret) 5914 *ppos = pos; 5915 return ret; 5916 } 5917 5918 static 5919 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5920 { 5921 if (rt) { 5922 if (action) 5923 rt->dst.flags |= DST_NOPOLICY; 5924 else 5925 rt->dst.flags &= ~DST_NOPOLICY; 5926 } 5927 } 5928 5929 static 5930 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5931 { 5932 struct inet6_ifaddr *ifa; 5933 5934 read_lock_bh(&idev->lock); 5935 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5936 spin_lock(&ifa->lock); 5937 if (ifa->rt) { 5938 struct rt6_info *rt = ifa->rt; 5939 int cpu; 5940 5941 rcu_read_lock(); 5942 addrconf_set_nopolicy(ifa->rt, val); 5943 if (rt->rt6i_pcpu) { 5944 for_each_possible_cpu(cpu) { 5945 struct rt6_info **rtp; 5946 5947 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5948 addrconf_set_nopolicy(*rtp, val); 5949 } 5950 } 5951 rcu_read_unlock(); 5952 } 5953 spin_unlock(&ifa->lock); 5954 } 5955 read_unlock_bh(&idev->lock); 5956 } 5957 5958 static 5959 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5960 { 5961 struct inet6_dev *idev; 5962 struct net *net; 5963 5964 if (!rtnl_trylock()) 5965 return restart_syscall(); 5966 5967 *valp = val; 5968 5969 net = (struct net *)ctl->extra2; 5970 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5971 rtnl_unlock(); 5972 return 0; 5973 } 5974 5975 if (valp == &net->ipv6.devconf_all->disable_policy) { 5976 struct net_device *dev; 5977 5978 for_each_netdev(net, dev) { 5979 idev = __in6_dev_get(dev); 5980 if (idev) 5981 addrconf_disable_policy_idev(idev, val); 5982 } 5983 } else { 5984 idev = (struct inet6_dev *)ctl->extra1; 5985 addrconf_disable_policy_idev(idev, val); 5986 } 5987 5988 rtnl_unlock(); 5989 return 0; 5990 } 5991 5992 static 5993 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5994 void __user *buffer, size_t *lenp, 5995 loff_t *ppos) 5996 { 5997 int *valp = ctl->data; 5998 int val = *valp; 5999 loff_t pos = *ppos; 6000 struct ctl_table lctl; 6001 int ret; 6002 6003 lctl = *ctl; 6004 lctl.data = &val; 6005 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6006 6007 if (write && (*valp != val)) 6008 ret = addrconf_disable_policy(ctl, valp, val); 6009 6010 if (ret) 6011 *ppos = pos; 6012 6013 return ret; 6014 } 6015 6016 static int minus_one = -1; 6017 static const int zero = 0; 6018 static const int one = 1; 6019 static const int two_five_five = 255; 6020 6021 static const struct ctl_table addrconf_sysctl[] = { 6022 { 6023 .procname = "forwarding", 6024 .data = &ipv6_devconf.forwarding, 6025 .maxlen = sizeof(int), 6026 .mode = 0644, 6027 .proc_handler = addrconf_sysctl_forward, 6028 }, 6029 { 6030 .procname = "hop_limit", 6031 .data = &ipv6_devconf.hop_limit, 6032 .maxlen = sizeof(int), 6033 .mode = 0644, 6034 .proc_handler = proc_dointvec_minmax, 6035 .extra1 = (void *)&one, 6036 .extra2 = (void *)&two_five_five, 6037 }, 6038 { 6039 .procname = "mtu", 6040 .data = &ipv6_devconf.mtu6, 6041 .maxlen = sizeof(int), 6042 .mode = 0644, 6043 .proc_handler = addrconf_sysctl_mtu, 6044 }, 6045 { 6046 .procname = "accept_ra", 6047 .data = &ipv6_devconf.accept_ra, 6048 .maxlen = sizeof(int), 6049 .mode = 0644, 6050 .proc_handler = proc_dointvec, 6051 }, 6052 { 6053 .procname = "accept_redirects", 6054 .data = &ipv6_devconf.accept_redirects, 6055 .maxlen = sizeof(int), 6056 .mode = 0644, 6057 .proc_handler = proc_dointvec, 6058 }, 6059 { 6060 .procname = "autoconf", 6061 .data = &ipv6_devconf.autoconf, 6062 .maxlen = sizeof(int), 6063 .mode = 0644, 6064 .proc_handler = proc_dointvec, 6065 }, 6066 { 6067 .procname = "dad_transmits", 6068 .data = &ipv6_devconf.dad_transmits, 6069 .maxlen = sizeof(int), 6070 .mode = 0644, 6071 .proc_handler = proc_dointvec, 6072 }, 6073 { 6074 .procname = "router_solicitations", 6075 .data = &ipv6_devconf.rtr_solicits, 6076 .maxlen = sizeof(int), 6077 .mode = 0644, 6078 .proc_handler = proc_dointvec_minmax, 6079 .extra1 = &minus_one, 6080 }, 6081 { 6082 .procname = "router_solicitation_interval", 6083 .data = &ipv6_devconf.rtr_solicit_interval, 6084 .maxlen = sizeof(int), 6085 .mode = 0644, 6086 .proc_handler = proc_dointvec_jiffies, 6087 }, 6088 { 6089 .procname = "router_solicitation_max_interval", 6090 .data = &ipv6_devconf.rtr_solicit_max_interval, 6091 .maxlen = sizeof(int), 6092 .mode = 0644, 6093 .proc_handler = proc_dointvec_jiffies, 6094 }, 6095 { 6096 .procname = "router_solicitation_delay", 6097 .data = &ipv6_devconf.rtr_solicit_delay, 6098 .maxlen = sizeof(int), 6099 .mode = 0644, 6100 .proc_handler = proc_dointvec_jiffies, 6101 }, 6102 { 6103 .procname = "force_mld_version", 6104 .data = &ipv6_devconf.force_mld_version, 6105 .maxlen = sizeof(int), 6106 .mode = 0644, 6107 .proc_handler = proc_dointvec, 6108 }, 6109 { 6110 .procname = "mldv1_unsolicited_report_interval", 6111 .data = 6112 &ipv6_devconf.mldv1_unsolicited_report_interval, 6113 .maxlen = sizeof(int), 6114 .mode = 0644, 6115 .proc_handler = proc_dointvec_ms_jiffies, 6116 }, 6117 { 6118 .procname = "mldv2_unsolicited_report_interval", 6119 .data = 6120 &ipv6_devconf.mldv2_unsolicited_report_interval, 6121 .maxlen = sizeof(int), 6122 .mode = 0644, 6123 .proc_handler = proc_dointvec_ms_jiffies, 6124 }, 6125 { 6126 .procname = "use_tempaddr", 6127 .data = &ipv6_devconf.use_tempaddr, 6128 .maxlen = sizeof(int), 6129 .mode = 0644, 6130 .proc_handler = proc_dointvec, 6131 }, 6132 { 6133 .procname = "temp_valid_lft", 6134 .data = &ipv6_devconf.temp_valid_lft, 6135 .maxlen = sizeof(int), 6136 .mode = 0644, 6137 .proc_handler = proc_dointvec, 6138 }, 6139 { 6140 .procname = "temp_prefered_lft", 6141 .data = &ipv6_devconf.temp_prefered_lft, 6142 .maxlen = sizeof(int), 6143 .mode = 0644, 6144 .proc_handler = proc_dointvec, 6145 }, 6146 { 6147 .procname = "regen_max_retry", 6148 .data = &ipv6_devconf.regen_max_retry, 6149 .maxlen = sizeof(int), 6150 .mode = 0644, 6151 .proc_handler = proc_dointvec, 6152 }, 6153 { 6154 .procname = "max_desync_factor", 6155 .data = &ipv6_devconf.max_desync_factor, 6156 .maxlen = sizeof(int), 6157 .mode = 0644, 6158 .proc_handler = proc_dointvec, 6159 }, 6160 { 6161 .procname = "max_addresses", 6162 .data = &ipv6_devconf.max_addresses, 6163 .maxlen = sizeof(int), 6164 .mode = 0644, 6165 .proc_handler = proc_dointvec, 6166 }, 6167 { 6168 .procname = "accept_ra_defrtr", 6169 .data = &ipv6_devconf.accept_ra_defrtr, 6170 .maxlen = sizeof(int), 6171 .mode = 0644, 6172 .proc_handler = proc_dointvec, 6173 }, 6174 { 6175 .procname = "accept_ra_min_hop_limit", 6176 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6177 .maxlen = sizeof(int), 6178 .mode = 0644, 6179 .proc_handler = proc_dointvec, 6180 }, 6181 { 6182 .procname = "accept_ra_pinfo", 6183 .data = &ipv6_devconf.accept_ra_pinfo, 6184 .maxlen = sizeof(int), 6185 .mode = 0644, 6186 .proc_handler = proc_dointvec, 6187 }, 6188 #ifdef CONFIG_IPV6_ROUTER_PREF 6189 { 6190 .procname = "accept_ra_rtr_pref", 6191 .data = &ipv6_devconf.accept_ra_rtr_pref, 6192 .maxlen = sizeof(int), 6193 .mode = 0644, 6194 .proc_handler = proc_dointvec, 6195 }, 6196 { 6197 .procname = "router_probe_interval", 6198 .data = &ipv6_devconf.rtr_probe_interval, 6199 .maxlen = sizeof(int), 6200 .mode = 0644, 6201 .proc_handler = proc_dointvec_jiffies, 6202 }, 6203 #ifdef CONFIG_IPV6_ROUTE_INFO 6204 { 6205 .procname = "accept_ra_rt_info_min_plen", 6206 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = proc_dointvec, 6210 }, 6211 { 6212 .procname = "accept_ra_rt_info_max_plen", 6213 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6214 .maxlen = sizeof(int), 6215 .mode = 0644, 6216 .proc_handler = proc_dointvec, 6217 }, 6218 #endif 6219 #endif 6220 { 6221 .procname = "proxy_ndp", 6222 .data = &ipv6_devconf.proxy_ndp, 6223 .maxlen = sizeof(int), 6224 .mode = 0644, 6225 .proc_handler = addrconf_sysctl_proxy_ndp, 6226 }, 6227 { 6228 .procname = "accept_source_route", 6229 .data = &ipv6_devconf.accept_source_route, 6230 .maxlen = sizeof(int), 6231 .mode = 0644, 6232 .proc_handler = proc_dointvec, 6233 }, 6234 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6235 { 6236 .procname = "optimistic_dad", 6237 .data = &ipv6_devconf.optimistic_dad, 6238 .maxlen = sizeof(int), 6239 .mode = 0644, 6240 .proc_handler = proc_dointvec, 6241 }, 6242 { 6243 .procname = "use_optimistic", 6244 .data = &ipv6_devconf.use_optimistic, 6245 .maxlen = sizeof(int), 6246 .mode = 0644, 6247 .proc_handler = proc_dointvec, 6248 }, 6249 #endif 6250 #ifdef CONFIG_IPV6_MROUTE 6251 { 6252 .procname = "mc_forwarding", 6253 .data = &ipv6_devconf.mc_forwarding, 6254 .maxlen = sizeof(int), 6255 .mode = 0444, 6256 .proc_handler = proc_dointvec, 6257 }, 6258 #endif 6259 { 6260 .procname = "disable_ipv6", 6261 .data = &ipv6_devconf.disable_ipv6, 6262 .maxlen = sizeof(int), 6263 .mode = 0644, 6264 .proc_handler = addrconf_sysctl_disable, 6265 }, 6266 { 6267 .procname = "accept_dad", 6268 .data = &ipv6_devconf.accept_dad, 6269 .maxlen = sizeof(int), 6270 .mode = 0644, 6271 .proc_handler = proc_dointvec, 6272 }, 6273 { 6274 .procname = "force_tllao", 6275 .data = &ipv6_devconf.force_tllao, 6276 .maxlen = sizeof(int), 6277 .mode = 0644, 6278 .proc_handler = proc_dointvec 6279 }, 6280 { 6281 .procname = "ndisc_notify", 6282 .data = &ipv6_devconf.ndisc_notify, 6283 .maxlen = sizeof(int), 6284 .mode = 0644, 6285 .proc_handler = proc_dointvec 6286 }, 6287 { 6288 .procname = "suppress_frag_ndisc", 6289 .data = &ipv6_devconf.suppress_frag_ndisc, 6290 .maxlen = sizeof(int), 6291 .mode = 0644, 6292 .proc_handler = proc_dointvec 6293 }, 6294 { 6295 .procname = "accept_ra_from_local", 6296 .data = &ipv6_devconf.accept_ra_from_local, 6297 .maxlen = sizeof(int), 6298 .mode = 0644, 6299 .proc_handler = proc_dointvec, 6300 }, 6301 { 6302 .procname = "accept_ra_mtu", 6303 .data = &ipv6_devconf.accept_ra_mtu, 6304 .maxlen = sizeof(int), 6305 .mode = 0644, 6306 .proc_handler = proc_dointvec, 6307 }, 6308 { 6309 .procname = "stable_secret", 6310 .data = &ipv6_devconf.stable_secret, 6311 .maxlen = IPV6_MAX_STRLEN, 6312 .mode = 0600, 6313 .proc_handler = addrconf_sysctl_stable_secret, 6314 }, 6315 { 6316 .procname = "use_oif_addrs_only", 6317 .data = &ipv6_devconf.use_oif_addrs_only, 6318 .maxlen = sizeof(int), 6319 .mode = 0644, 6320 .proc_handler = proc_dointvec, 6321 }, 6322 { 6323 .procname = "ignore_routes_with_linkdown", 6324 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6325 .maxlen = sizeof(int), 6326 .mode = 0644, 6327 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6328 }, 6329 { 6330 .procname = "drop_unicast_in_l2_multicast", 6331 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6332 .maxlen = sizeof(int), 6333 .mode = 0644, 6334 .proc_handler = proc_dointvec, 6335 }, 6336 { 6337 .procname = "drop_unsolicited_na", 6338 .data = &ipv6_devconf.drop_unsolicited_na, 6339 .maxlen = sizeof(int), 6340 .mode = 0644, 6341 .proc_handler = proc_dointvec, 6342 }, 6343 { 6344 .procname = "keep_addr_on_down", 6345 .data = &ipv6_devconf.keep_addr_on_down, 6346 .maxlen = sizeof(int), 6347 .mode = 0644, 6348 .proc_handler = proc_dointvec, 6349 6350 }, 6351 { 6352 .procname = "seg6_enabled", 6353 .data = &ipv6_devconf.seg6_enabled, 6354 .maxlen = sizeof(int), 6355 .mode = 0644, 6356 .proc_handler = proc_dointvec, 6357 }, 6358 #ifdef CONFIG_IPV6_SEG6_HMAC 6359 { 6360 .procname = "seg6_require_hmac", 6361 .data = &ipv6_devconf.seg6_require_hmac, 6362 .maxlen = sizeof(int), 6363 .mode = 0644, 6364 .proc_handler = proc_dointvec, 6365 }, 6366 #endif 6367 { 6368 .procname = "enhanced_dad", 6369 .data = &ipv6_devconf.enhanced_dad, 6370 .maxlen = sizeof(int), 6371 .mode = 0644, 6372 .proc_handler = proc_dointvec, 6373 }, 6374 { 6375 .procname = "addr_gen_mode", 6376 .data = &ipv6_devconf.addr_gen_mode, 6377 .maxlen = sizeof(int), 6378 .mode = 0644, 6379 .proc_handler = addrconf_sysctl_addr_gen_mode, 6380 }, 6381 { 6382 .procname = "disable_policy", 6383 .data = &ipv6_devconf.disable_policy, 6384 .maxlen = sizeof(int), 6385 .mode = 0644, 6386 .proc_handler = addrconf_sysctl_disable_policy, 6387 }, 6388 { 6389 .procname = "ndisc_tclass", 6390 .data = &ipv6_devconf.ndisc_tclass, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec_minmax, 6394 .extra1 = (void *)&zero, 6395 .extra2 = (void *)&two_five_five, 6396 }, 6397 { 6398 /* sentinel */ 6399 } 6400 }; 6401 6402 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6403 struct inet6_dev *idev, struct ipv6_devconf *p) 6404 { 6405 int i, ifindex; 6406 struct ctl_table *table; 6407 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6408 6409 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6410 if (!table) 6411 goto out; 6412 6413 for (i = 0; table[i].data; i++) { 6414 table[i].data += (char *)p - (char *)&ipv6_devconf; 6415 /* If one of these is already set, then it is not safe to 6416 * overwrite either of them: this makes proc_dointvec_minmax 6417 * usable. 6418 */ 6419 if (!table[i].extra1 && !table[i].extra2) { 6420 table[i].extra1 = idev; /* embedded; no ref */ 6421 table[i].extra2 = net; 6422 } 6423 } 6424 6425 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6426 6427 p->sysctl_header = register_net_sysctl(net, path, table); 6428 if (!p->sysctl_header) 6429 goto free; 6430 6431 if (!strcmp(dev_name, "all")) 6432 ifindex = NETCONFA_IFINDEX_ALL; 6433 else if (!strcmp(dev_name, "default")) 6434 ifindex = NETCONFA_IFINDEX_DEFAULT; 6435 else 6436 ifindex = idev->dev->ifindex; 6437 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6438 ifindex, p); 6439 return 0; 6440 6441 free: 6442 kfree(table); 6443 out: 6444 return -ENOBUFS; 6445 } 6446 6447 static void __addrconf_sysctl_unregister(struct net *net, 6448 struct ipv6_devconf *p, int ifindex) 6449 { 6450 struct ctl_table *table; 6451 6452 if (!p->sysctl_header) 6453 return; 6454 6455 table = p->sysctl_header->ctl_table_arg; 6456 unregister_net_sysctl_table(p->sysctl_header); 6457 p->sysctl_header = NULL; 6458 kfree(table); 6459 6460 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6461 } 6462 6463 static int addrconf_sysctl_register(struct inet6_dev *idev) 6464 { 6465 int err; 6466 6467 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6468 return -EINVAL; 6469 6470 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6471 &ndisc_ifinfo_sysctl_change); 6472 if (err) 6473 return err; 6474 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6475 idev, &idev->cnf); 6476 if (err) 6477 neigh_sysctl_unregister(idev->nd_parms); 6478 6479 return err; 6480 } 6481 6482 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6483 { 6484 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6485 idev->dev->ifindex); 6486 neigh_sysctl_unregister(idev->nd_parms); 6487 } 6488 6489 6490 #endif 6491 6492 static int __net_init addrconf_init_net(struct net *net) 6493 { 6494 int err = -ENOMEM; 6495 struct ipv6_devconf *all, *dflt; 6496 6497 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6498 if (!all) 6499 goto err_alloc_all; 6500 6501 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6502 if (!dflt) 6503 goto err_alloc_dflt; 6504 6505 /* these will be inherited by all namespaces */ 6506 dflt->autoconf = ipv6_defaults.autoconf; 6507 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6508 6509 dflt->stable_secret.initialized = false; 6510 all->stable_secret.initialized = false; 6511 6512 net->ipv6.devconf_all = all; 6513 net->ipv6.devconf_dflt = dflt; 6514 6515 #ifdef CONFIG_SYSCTL 6516 err = __addrconf_sysctl_register(net, "all", NULL, all); 6517 if (err < 0) 6518 goto err_reg_all; 6519 6520 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6521 if (err < 0) 6522 goto err_reg_dflt; 6523 #endif 6524 return 0; 6525 6526 #ifdef CONFIG_SYSCTL 6527 err_reg_dflt: 6528 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6529 err_reg_all: 6530 kfree(dflt); 6531 #endif 6532 err_alloc_dflt: 6533 kfree(all); 6534 err_alloc_all: 6535 return err; 6536 } 6537 6538 static void __net_exit addrconf_exit_net(struct net *net) 6539 { 6540 #ifdef CONFIG_SYSCTL 6541 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6542 NETCONFA_IFINDEX_DEFAULT); 6543 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6544 NETCONFA_IFINDEX_ALL); 6545 #endif 6546 kfree(net->ipv6.devconf_dflt); 6547 kfree(net->ipv6.devconf_all); 6548 } 6549 6550 static struct pernet_operations addrconf_ops = { 6551 .init = addrconf_init_net, 6552 .exit = addrconf_exit_net, 6553 }; 6554 6555 static struct rtnl_af_ops inet6_ops __read_mostly = { 6556 .family = AF_INET6, 6557 .fill_link_af = inet6_fill_link_af, 6558 .get_link_af_size = inet6_get_link_af_size, 6559 .validate_link_af = inet6_validate_link_af, 6560 .set_link_af = inet6_set_link_af, 6561 }; 6562 6563 /* 6564 * Init / cleanup code 6565 */ 6566 6567 int __init addrconf_init(void) 6568 { 6569 struct inet6_dev *idev; 6570 int i, err; 6571 6572 err = ipv6_addr_label_init(); 6573 if (err < 0) { 6574 pr_crit("%s: cannot initialize default policy table: %d\n", 6575 __func__, err); 6576 goto out; 6577 } 6578 6579 err = register_pernet_subsys(&addrconf_ops); 6580 if (err < 0) 6581 goto out_addrlabel; 6582 6583 addrconf_wq = create_workqueue("ipv6_addrconf"); 6584 if (!addrconf_wq) { 6585 err = -ENOMEM; 6586 goto out_nowq; 6587 } 6588 6589 /* The addrconf netdev notifier requires that loopback_dev 6590 * has it's ipv6 private information allocated and setup 6591 * before it can bring up and give link-local addresses 6592 * to other devices which are up. 6593 * 6594 * Unfortunately, loopback_dev is not necessarily the first 6595 * entry in the global dev_base list of net devices. In fact, 6596 * it is likely to be the very last entry on that list. 6597 * So this causes the notifier registry below to try and 6598 * give link-local addresses to all devices besides loopback_dev 6599 * first, then loopback_dev, which cases all the non-loopback_dev 6600 * devices to fail to get a link-local address. 6601 * 6602 * So, as a temporary fix, allocate the ipv6 structure for 6603 * loopback_dev first by hand. 6604 * Longer term, all of the dependencies ipv6 has upon the loopback 6605 * device and it being up should be removed. 6606 */ 6607 rtnl_lock(); 6608 idev = ipv6_add_dev(init_net.loopback_dev); 6609 rtnl_unlock(); 6610 if (IS_ERR(idev)) { 6611 err = PTR_ERR(idev); 6612 goto errlo; 6613 } 6614 6615 ip6_route_init_special_entries(); 6616 6617 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6618 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6619 6620 register_netdevice_notifier(&ipv6_dev_notf); 6621 6622 addrconf_verify(); 6623 6624 rtnl_af_register(&inet6_ops); 6625 6626 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6627 NULL, inet6_dump_ifinfo, 0); 6628 if (err < 0) 6629 goto errout; 6630 6631 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6632 inet6_rtm_newaddr, NULL, 0); 6633 if (err < 0) 6634 goto errout; 6635 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6636 inet6_rtm_deladdr, NULL, 0); 6637 if (err < 0) 6638 goto errout; 6639 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6640 inet6_rtm_getaddr, inet6_dump_ifaddr, 6641 RTNL_FLAG_DOIT_UNLOCKED); 6642 if (err < 0) 6643 goto errout; 6644 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6645 NULL, inet6_dump_ifmcaddr, 0); 6646 if (err < 0) 6647 goto errout; 6648 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6649 NULL, inet6_dump_ifacaddr, 0); 6650 if (err < 0) 6651 goto errout; 6652 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6653 inet6_netconf_get_devconf, 6654 inet6_netconf_dump_devconf, 6655 RTNL_FLAG_DOIT_UNLOCKED); 6656 if (err < 0) 6657 goto errout; 6658 err = ipv6_addr_label_rtnl_register(); 6659 if (err < 0) 6660 goto errout; 6661 6662 return 0; 6663 errout: 6664 rtnl_unregister_all(PF_INET6); 6665 rtnl_af_unregister(&inet6_ops); 6666 unregister_netdevice_notifier(&ipv6_dev_notf); 6667 errlo: 6668 destroy_workqueue(addrconf_wq); 6669 out_nowq: 6670 unregister_pernet_subsys(&addrconf_ops); 6671 out_addrlabel: 6672 ipv6_addr_label_cleanup(); 6673 out: 6674 return err; 6675 } 6676 6677 void addrconf_cleanup(void) 6678 { 6679 struct net_device *dev; 6680 int i; 6681 6682 unregister_netdevice_notifier(&ipv6_dev_notf); 6683 unregister_pernet_subsys(&addrconf_ops); 6684 ipv6_addr_label_cleanup(); 6685 6686 rtnl_af_unregister(&inet6_ops); 6687 6688 rtnl_lock(); 6689 6690 /* clean dev list */ 6691 for_each_netdev(&init_net, dev) { 6692 if (__in6_dev_get(dev) == NULL) 6693 continue; 6694 addrconf_ifdown(dev, 1); 6695 } 6696 addrconf_ifdown(init_net.loopback_dev, 2); 6697 6698 /* 6699 * Check hash table. 6700 */ 6701 spin_lock_bh(&addrconf_hash_lock); 6702 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6703 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6704 spin_unlock_bh(&addrconf_hash_lock); 6705 cancel_delayed_work(&addr_chk_work); 6706 rtnl_unlock(); 6707 6708 destroy_workqueue(addrconf_wq); 6709 } 6710