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(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 /* 161 * Configured unicast address hash table 162 */ 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 164 static DEFINE_SPINLOCK(addrconf_hash_lock); 165 166 static void addrconf_verify(void); 167 static void addrconf_verify_rtnl(void); 168 static void addrconf_verify_work(struct work_struct *); 169 170 static struct workqueue_struct *addrconf_wq; 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 172 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 175 176 static void addrconf_type_change(struct net_device *dev, 177 unsigned long event); 178 static int addrconf_ifdown(struct net_device *dev, int how); 179 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 181 int plen, 182 const struct net_device *dev, 183 u32 flags, u32 noflags); 184 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 186 static void addrconf_dad_work(struct work_struct *w); 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 188 static void addrconf_dad_run(struct inet6_dev *idev); 189 static void addrconf_rs_timer(unsigned long data); 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 192 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 194 struct prefix_info *pinfo); 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 196 struct net_device *dev); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_min_plen = 0, 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 .accept_ra_mtu = 1, 237 .stable_secret = { 238 .initialized = false, 239 }, 240 .use_oif_addrs_only = 0, 241 .ignore_routes_with_linkdown = 0, 242 .keep_addr_on_down = 0, 243 .seg6_enabled = 0, 244 #ifdef CONFIG_IPV6_SEG6_HMAC 245 .seg6_require_hmac = 0, 246 #endif 247 .enhanced_dad = 1, 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 249 .disable_policy = 0, 250 }; 251 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 253 .forwarding = 0, 254 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 255 .mtu6 = IPV6_MIN_MTU, 256 .accept_ra = 1, 257 .accept_redirects = 1, 258 .autoconf = 1, 259 .force_mld_version = 0, 260 .mldv1_unsolicited_report_interval = 10 * HZ, 261 .mldv2_unsolicited_report_interval = HZ, 262 .dad_transmits = 1, 263 .rtr_solicits = MAX_RTR_SOLICITATIONS, 264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 267 .use_tempaddr = 0, 268 .temp_valid_lft = TEMP_VALID_LIFETIME, 269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 270 .regen_max_retry = REGEN_MAX_RETRY, 271 .max_desync_factor = MAX_DESYNC_FACTOR, 272 .max_addresses = IPV6_MAX_ADDRESSES, 273 .accept_ra_defrtr = 1, 274 .accept_ra_from_local = 0, 275 .accept_ra_min_hop_limit= 1, 276 .accept_ra_pinfo = 1, 277 #ifdef CONFIG_IPV6_ROUTER_PREF 278 .accept_ra_rtr_pref = 1, 279 .rtr_probe_interval = 60 * HZ, 280 #ifdef CONFIG_IPV6_ROUTE_INFO 281 .accept_ra_rt_info_min_plen = 0, 282 .accept_ra_rt_info_max_plen = 0, 283 #endif 284 #endif 285 .proxy_ndp = 0, 286 .accept_source_route = 0, /* we do not accept RH0 by default. */ 287 .disable_ipv6 = 0, 288 .accept_dad = 1, 289 .suppress_frag_ndisc = 1, 290 .accept_ra_mtu = 1, 291 .stable_secret = { 292 .initialized = false, 293 }, 294 .use_oif_addrs_only = 0, 295 .ignore_routes_with_linkdown = 0, 296 .keep_addr_on_down = 0, 297 .seg6_enabled = 0, 298 #ifdef CONFIG_IPV6_SEG6_HMAC 299 .seg6_require_hmac = 0, 300 #endif 301 .enhanced_dad = 1, 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 303 .disable_policy = 0, 304 }; 305 306 /* Check if a valid qdisc is available */ 307 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 308 { 309 return !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!timer_pending(&idev->rs_timer)) 328 in6_dev_hold(idev); 329 mod_timer(&idev->rs_timer, jiffies + when); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 392 (unsigned long)ndev); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 else 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 399 400 ndev->cnf.mtu6 = dev->mtu; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 dev_hold(dev); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 ADBG(KERN_WARNING 413 "%s: cannot allocate memory for statistics; dev=%s.\n", 414 __func__, dev->name); 415 neigh_parms_release(&nd_tbl, ndev->nd_parms); 416 dev_put(dev); 417 kfree(ndev); 418 return ERR_PTR(err); 419 } 420 421 if (snmp6_register_dev(ndev) < 0) { 422 ADBG(KERN_WARNING 423 "%s: cannot create /proc/net/dev_snmp6/%s\n", 424 __func__, dev->name); 425 goto err_release; 426 } 427 428 /* One reference from device. */ 429 refcount_set(&ndev->refcnt, 1); 430 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 432 ndev->cnf.accept_dad = -1; 433 434 #if IS_ENABLED(CONFIG_IPV6_SIT) 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 436 pr_info("%s: Disabled Multicast RS\n", dev->name); 437 ndev->cnf.rtr_solicits = 0; 438 } 439 #endif 440 441 INIT_LIST_HEAD(&ndev->tempaddr_list); 442 ndev->desync_factor = U32_MAX; 443 if ((dev->flags&IFF_LOOPBACK) || 444 dev->type == ARPHRD_TUNNEL || 445 dev->type == ARPHRD_TUNNEL6 || 446 dev->type == ARPHRD_SIT || 447 dev->type == ARPHRD_NONE) { 448 ndev->cnf.use_tempaddr = -1; 449 } else 450 ipv6_regen_rndid(ndev); 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_qdisc_ok(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 netconfmsg *ncm; 620 struct sk_buff *skb; 621 struct ipv6_devconf *devconf; 622 struct inet6_dev *in6_dev; 623 struct net_device *dev; 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 goto errout; 631 632 err = -EINVAL; 633 if (!tb[NETCONFA_IFINDEX]) 634 goto errout; 635 636 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 goto errout; 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_ATOMIC); 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 return err; 673 } 674 675 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 676 struct netlink_callback *cb) 677 { 678 struct net *net = sock_net(skb->sk); 679 int h, s_h; 680 int idx, s_idx; 681 struct net_device *dev; 682 struct inet6_dev *idev; 683 struct hlist_head *head; 684 685 s_h = cb->args[0]; 686 s_idx = idx = cb->args[1]; 687 688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 689 idx = 0; 690 head = &net->dev_index_head[h]; 691 rcu_read_lock(); 692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 693 net->dev_base_seq; 694 hlist_for_each_entry_rcu(dev, head, index_hlist) { 695 if (idx < s_idx) 696 goto cont; 697 idev = __in6_dev_get(dev); 698 if (!idev) 699 goto cont; 700 701 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 702 &idev->cnf, 703 NETLINK_CB(cb->skb).portid, 704 cb->nlh->nlmsg_seq, 705 RTM_NEWNETCONF, 706 NLM_F_MULTI, 707 NETCONFA_ALL) < 0) { 708 rcu_read_unlock(); 709 goto done; 710 } 711 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 712 cont: 713 idx++; 714 } 715 rcu_read_unlock(); 716 } 717 if (h == NETDEV_HASHENTRIES) { 718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 719 net->ipv6.devconf_all, 720 NETLINK_CB(cb->skb).portid, 721 cb->nlh->nlmsg_seq, 722 RTM_NEWNETCONF, NLM_F_MULTI, 723 NETCONFA_ALL) < 0) 724 goto done; 725 else 726 h++; 727 } 728 if (h == NETDEV_HASHENTRIES + 1) { 729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 730 net->ipv6.devconf_dflt, 731 NETLINK_CB(cb->skb).portid, 732 cb->nlh->nlmsg_seq, 733 RTM_NEWNETCONF, NLM_F_MULTI, 734 NETCONFA_ALL) < 0) 735 goto done; 736 else 737 h++; 738 } 739 done: 740 cb->args[0] = h; 741 cb->args[1] = idx; 742 743 return skb->len; 744 } 745 746 #ifdef CONFIG_SYSCTL 747 static void dev_forward_change(struct inet6_dev *idev) 748 { 749 struct net_device *dev; 750 struct inet6_ifaddr *ifa; 751 752 if (!idev) 753 return; 754 dev = idev->dev; 755 if (idev->cnf.forwarding) 756 dev_disable_lro(dev); 757 if (dev->flags & IFF_MULTICAST) { 758 if (idev->cnf.forwarding) { 759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 762 } else { 763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 766 } 767 } 768 769 list_for_each_entry(ifa, &idev->addr_list, if_list) { 770 if (ifa->flags&IFA_F_TENTATIVE) 771 continue; 772 if (idev->cnf.forwarding) 773 addrconf_join_anycast(ifa); 774 else 775 addrconf_leave_anycast(ifa); 776 } 777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 778 NETCONFA_FORWARDING, 779 dev->ifindex, &idev->cnf); 780 } 781 782 783 static void addrconf_forward_change(struct net *net, __s32 newf) 784 { 785 struct net_device *dev; 786 struct inet6_dev *idev; 787 788 for_each_netdev(net, dev) { 789 idev = __in6_dev_get(dev); 790 if (idev) { 791 int changed = (!idev->cnf.forwarding) ^ (!newf); 792 idev->cnf.forwarding = newf; 793 if (changed) 794 dev_forward_change(idev); 795 } 796 } 797 } 798 799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 800 { 801 struct net *net; 802 int old; 803 804 if (!rtnl_trylock()) 805 return restart_syscall(); 806 807 net = (struct net *)table->extra2; 808 old = *p; 809 *p = newf; 810 811 if (p == &net->ipv6.devconf_dflt->forwarding) { 812 if ((!newf) ^ (!old)) 813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 814 NETCONFA_FORWARDING, 815 NETCONFA_IFINDEX_DEFAULT, 816 net->ipv6.devconf_dflt); 817 rtnl_unlock(); 818 return 0; 819 } 820 821 if (p == &net->ipv6.devconf_all->forwarding) { 822 int old_dflt = net->ipv6.devconf_dflt->forwarding; 823 824 net->ipv6.devconf_dflt->forwarding = newf; 825 if ((!newf) ^ (!old_dflt)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_DEFAULT, 829 net->ipv6.devconf_dflt); 830 831 addrconf_forward_change(net, newf); 832 if ((!newf) ^ (!old)) 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 834 NETCONFA_FORWARDING, 835 NETCONFA_IFINDEX_ALL, 836 net->ipv6.devconf_all); 837 } else if ((!newf) ^ (!old)) 838 dev_forward_change((struct inet6_dev *)table->extra1); 839 rtnl_unlock(); 840 841 if (newf) 842 rt6_purge_dflt_routers(net); 843 return 1; 844 } 845 846 static void addrconf_linkdown_change(struct net *net, __s32 newf) 847 { 848 struct net_device *dev; 849 struct inet6_dev *idev; 850 851 for_each_netdev(net, dev) { 852 idev = __in6_dev_get(dev); 853 if (idev) { 854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 855 856 idev->cnf.ignore_routes_with_linkdown = newf; 857 if (changed) 858 inet6_netconf_notify_devconf(dev_net(dev), 859 RTM_NEWNETCONF, 860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 861 dev->ifindex, 862 &idev->cnf); 863 } 864 } 865 } 866 867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 868 { 869 struct net *net; 870 int old; 871 872 if (!rtnl_trylock()) 873 return restart_syscall(); 874 875 net = (struct net *)table->extra2; 876 old = *p; 877 *p = newf; 878 879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 880 if ((!newf) ^ (!old)) 881 inet6_netconf_notify_devconf(net, 882 RTM_NEWNETCONF, 883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 884 NETCONFA_IFINDEX_DEFAULT, 885 net->ipv6.devconf_dflt); 886 rtnl_unlock(); 887 return 0; 888 } 889 890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 892 addrconf_linkdown_change(net, newf); 893 if ((!newf) ^ (!old)) 894 inet6_netconf_notify_devconf(net, 895 RTM_NEWNETCONF, 896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 897 NETCONFA_IFINDEX_ALL, 898 net->ipv6.devconf_all); 899 } 900 rtnl_unlock(); 901 902 return 1; 903 } 904 905 #endif 906 907 /* Nobody refers to this ifaddr, destroy it */ 908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 909 { 910 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 911 912 #ifdef NET_REFCNT_DEBUG 913 pr_debug("%s\n", __func__); 914 #endif 915 916 in6_dev_put(ifp->idev); 917 918 if (cancel_delayed_work(&ifp->dad_work)) 919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 920 ifp); 921 922 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 923 pr_warn("Freeing alive inet6 address %p\n", ifp); 924 return; 925 } 926 ip6_rt_put(ifp->rt); 927 928 kfree_rcu(ifp, rcu); 929 } 930 931 static void 932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 933 { 934 struct list_head *p; 935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 936 937 /* 938 * Each device address list is sorted in order of scope - 939 * global before linklocal. 940 */ 941 list_for_each(p, &idev->addr_list) { 942 struct inet6_ifaddr *ifa 943 = list_entry(p, struct inet6_ifaddr, if_list); 944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 945 break; 946 } 947 948 list_add_tail(&ifp->if_list, p); 949 } 950 951 static u32 inet6_addr_hash(const struct in6_addr *addr) 952 { 953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 954 } 955 956 /* On success it returns ifp with increased reference count */ 957 958 static struct inet6_ifaddr * 959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 960 const struct in6_addr *peer_addr, int pfxlen, 961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 962 { 963 struct net *net = dev_net(idev->dev); 964 struct inet6_ifaddr *ifa = NULL; 965 struct rt6_info *rt; 966 struct in6_validator_info i6vi; 967 unsigned int hash; 968 int err = 0; 969 int addr_type = ipv6_addr_type(addr); 970 971 if (addr_type == IPV6_ADDR_ANY || 972 addr_type & IPV6_ADDR_MULTICAST || 973 (!(idev->dev->flags & IFF_LOOPBACK) && 974 addr_type & IPV6_ADDR_LOOPBACK)) 975 return ERR_PTR(-EADDRNOTAVAIL); 976 977 rcu_read_lock_bh(); 978 979 in6_dev_hold(idev); 980 981 if (idev->dead) { 982 err = -ENODEV; /*XXX*/ 983 goto out2; 984 } 985 986 if (idev->cnf.disable_ipv6) { 987 err = -EACCES; 988 goto out2; 989 } 990 991 i6vi.i6vi_addr = *addr; 992 i6vi.i6vi_dev = idev; 993 rcu_read_unlock_bh(); 994 995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 996 997 rcu_read_lock_bh(); 998 err = notifier_to_errno(err); 999 if (err) 1000 goto out2; 1001 1002 spin_lock(&addrconf_hash_lock); 1003 1004 /* Ignore adding duplicate addresses on an interface */ 1005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 1006 ADBG("ipv6_add_addr: already assigned\n"); 1007 err = -EEXIST; 1008 goto out; 1009 } 1010 1011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 1012 1013 if (!ifa) { 1014 ADBG("ipv6_add_addr: malloc failed\n"); 1015 err = -ENOBUFS; 1016 goto out; 1017 } 1018 1019 rt = addrconf_dst_alloc(idev, addr, false); 1020 if (IS_ERR(rt)) { 1021 err = PTR_ERR(rt); 1022 goto out; 1023 } 1024 1025 if (net->ipv6.devconf_all->disable_policy || 1026 idev->cnf.disable_policy) 1027 rt->dst.flags |= DST_NOPOLICY; 1028 1029 neigh_parms_data_state_setall(idev->nd_parms); 1030 1031 ifa->addr = *addr; 1032 if (peer_addr) 1033 ifa->peer_addr = *peer_addr; 1034 1035 spin_lock_init(&ifa->lock); 1036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1037 INIT_HLIST_NODE(&ifa->addr_lst); 1038 ifa->scope = scope; 1039 ifa->prefix_len = pfxlen; 1040 ifa->flags = flags; 1041 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1042 if (!(flags & IFA_F_NODAD)) 1043 ifa->flags |= IFA_F_TENTATIVE; 1044 ifa->valid_lft = valid_lft; 1045 ifa->prefered_lft = prefered_lft; 1046 ifa->cstamp = ifa->tstamp = jiffies; 1047 ifa->tokenized = false; 1048 1049 ifa->rt = rt; 1050 1051 ifa->idev = idev; 1052 /* For caller */ 1053 refcount_set(&ifa->refcnt, 1); 1054 1055 /* Add to big hash table */ 1056 hash = inet6_addr_hash(addr); 1057 1058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1059 spin_unlock(&addrconf_hash_lock); 1060 1061 write_lock(&idev->lock); 1062 /* Add to inet6_dev unicast addr list. */ 1063 ipv6_link_dev_addr(idev, ifa); 1064 1065 if (ifa->flags&IFA_F_TEMPORARY) { 1066 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1067 in6_ifa_hold(ifa); 1068 } 1069 1070 in6_ifa_hold(ifa); 1071 write_unlock(&idev->lock); 1072 out2: 1073 rcu_read_unlock_bh(); 1074 1075 if (likely(err == 0)) 1076 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1077 else { 1078 kfree(ifa); 1079 in6_dev_put(idev); 1080 ifa = ERR_PTR(err); 1081 } 1082 1083 return ifa; 1084 out: 1085 spin_unlock(&addrconf_hash_lock); 1086 goto out2; 1087 } 1088 1089 enum cleanup_prefix_rt_t { 1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1093 }; 1094 1095 /* 1096 * Check, whether the prefix for ifp would still need a prefix route 1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1098 * constants. 1099 * 1100 * 1) we don't purge prefix if address was not permanent. 1101 * prefix is managed by its own lifetime. 1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1103 * 3) if there are no addresses, delete prefix. 1104 * 4) if there are still other permanent address(es), 1105 * corresponding prefix is still permanent. 1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1107 * don't purge the prefix, assume user space is managing it. 1108 * 6) otherwise, update prefix lifetime to the 1109 * longest valid lifetime among the corresponding 1110 * addresses on the device. 1111 * Note: subsequent RA will update lifetime. 1112 **/ 1113 static enum cleanup_prefix_rt_t 1114 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1115 { 1116 struct inet6_ifaddr *ifa; 1117 struct inet6_dev *idev = ifp->idev; 1118 unsigned long lifetime; 1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1120 1121 *expires = jiffies; 1122 1123 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1124 if (ifa == ifp) 1125 continue; 1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1127 ifp->prefix_len)) 1128 continue; 1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1130 return CLEANUP_PREFIX_RT_NOP; 1131 1132 action = CLEANUP_PREFIX_RT_EXPIRE; 1133 1134 spin_lock(&ifa->lock); 1135 1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1137 /* 1138 * Note: Because this address is 1139 * not permanent, lifetime < 1140 * LONG_MAX / HZ here. 1141 */ 1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1143 *expires = ifa->tstamp + lifetime * HZ; 1144 spin_unlock(&ifa->lock); 1145 } 1146 1147 return action; 1148 } 1149 1150 static void 1151 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1152 { 1153 struct rt6_info *rt; 1154 1155 rt = addrconf_get_prefix_route(&ifp->addr, 1156 ifp->prefix_len, 1157 ifp->idev->dev, 1158 0, RTF_GATEWAY | RTF_DEFAULT); 1159 if (rt) { 1160 if (del_rt) 1161 ip6_del_rt(rt); 1162 else { 1163 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1164 rt6_set_expires(rt, expires); 1165 ip6_rt_put(rt); 1166 } 1167 } 1168 } 1169 1170 1171 /* This function wants to get referenced ifp and releases it before return */ 1172 1173 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1174 { 1175 int state; 1176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1177 unsigned long expires; 1178 1179 ASSERT_RTNL(); 1180 1181 spin_lock_bh(&ifp->lock); 1182 state = ifp->state; 1183 ifp->state = INET6_IFADDR_STATE_DEAD; 1184 spin_unlock_bh(&ifp->lock); 1185 1186 if (state == INET6_IFADDR_STATE_DEAD) 1187 goto out; 1188 1189 spin_lock_bh(&addrconf_hash_lock); 1190 hlist_del_init_rcu(&ifp->addr_lst); 1191 spin_unlock_bh(&addrconf_hash_lock); 1192 1193 write_lock_bh(&ifp->idev->lock); 1194 1195 if (ifp->flags&IFA_F_TEMPORARY) { 1196 list_del(&ifp->tmp_list); 1197 if (ifp->ifpub) { 1198 in6_ifa_put(ifp->ifpub); 1199 ifp->ifpub = NULL; 1200 } 1201 __in6_ifa_put(ifp); 1202 } 1203 1204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1205 action = check_cleanup_prefix_route(ifp, &expires); 1206 1207 list_del_init(&ifp->if_list); 1208 __in6_ifa_put(ifp); 1209 1210 write_unlock_bh(&ifp->idev->lock); 1211 1212 addrconf_del_dad_work(ifp); 1213 1214 ipv6_ifa_notify(RTM_DELADDR, ifp); 1215 1216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1217 1218 if (action != CLEANUP_PREFIX_RT_NOP) { 1219 cleanup_prefix_route(ifp, expires, 1220 action == CLEANUP_PREFIX_RT_DEL); 1221 } 1222 1223 /* clean up prefsrc entries */ 1224 rt6_remove_prefsrc(ifp); 1225 out: 1226 in6_ifa_put(ifp); 1227 } 1228 1229 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1230 { 1231 struct inet6_dev *idev = ifp->idev; 1232 struct in6_addr addr, *tmpaddr; 1233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1234 unsigned long regen_advance; 1235 int tmp_plen; 1236 int ret = 0; 1237 u32 addr_flags; 1238 unsigned long now = jiffies; 1239 long max_desync_factor; 1240 s32 cnf_temp_preferred_lft; 1241 1242 write_lock_bh(&idev->lock); 1243 if (ift) { 1244 spin_lock_bh(&ift->lock); 1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1246 spin_unlock_bh(&ift->lock); 1247 tmpaddr = &addr; 1248 } else { 1249 tmpaddr = NULL; 1250 } 1251 retry: 1252 in6_dev_hold(idev); 1253 if (idev->cnf.use_tempaddr <= 0) { 1254 write_unlock_bh(&idev->lock); 1255 pr_info("%s: use_tempaddr is disabled\n", __func__); 1256 in6_dev_put(idev); 1257 ret = -1; 1258 goto out; 1259 } 1260 spin_lock_bh(&ifp->lock); 1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1262 idev->cnf.use_tempaddr = -1; /*XXX*/ 1263 spin_unlock_bh(&ifp->lock); 1264 write_unlock_bh(&idev->lock); 1265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1266 __func__); 1267 in6_dev_put(idev); 1268 ret = -1; 1269 goto out; 1270 } 1271 in6_ifa_hold(ifp); 1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1273 ipv6_try_regen_rndid(idev, tmpaddr); 1274 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1275 age = (now - ifp->tstamp) / HZ; 1276 1277 regen_advance = idev->cnf.regen_max_retry * 1278 idev->cnf.dad_transmits * 1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1280 1281 /* recalculate max_desync_factor each time and update 1282 * idev->desync_factor if it's larger 1283 */ 1284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1285 max_desync_factor = min_t(__u32, 1286 idev->cnf.max_desync_factor, 1287 cnf_temp_preferred_lft - regen_advance); 1288 1289 if (unlikely(idev->desync_factor > max_desync_factor)) { 1290 if (max_desync_factor > 0) { 1291 get_random_bytes(&idev->desync_factor, 1292 sizeof(idev->desync_factor)); 1293 idev->desync_factor %= max_desync_factor; 1294 } else { 1295 idev->desync_factor = 0; 1296 } 1297 } 1298 1299 tmp_valid_lft = min_t(__u32, 1300 ifp->valid_lft, 1301 idev->cnf.temp_valid_lft + age); 1302 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1303 idev->desync_factor; 1304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1305 tmp_plen = ifp->prefix_len; 1306 tmp_tstamp = ifp->tstamp; 1307 spin_unlock_bh(&ifp->lock); 1308 1309 write_unlock_bh(&idev->lock); 1310 1311 /* A temporary address is created only if this calculated Preferred 1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1313 * an implementation must not create a temporary address with a zero 1314 * Preferred Lifetime. 1315 * Use age calculation as in addrconf_verify to avoid unnecessary 1316 * temporary addresses being generated. 1317 */ 1318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1319 if (tmp_prefered_lft <= regen_advance + age) { 1320 in6_ifa_put(ifp); 1321 in6_dev_put(idev); 1322 ret = -1; 1323 goto out; 1324 } 1325 1326 addr_flags = IFA_F_TEMPORARY; 1327 /* set in addrconf_prefix_rcv() */ 1328 if (ifp->flags & IFA_F_OPTIMISTIC) 1329 addr_flags |= IFA_F_OPTIMISTIC; 1330 1331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1332 ipv6_addr_scope(&addr), addr_flags, 1333 tmp_valid_lft, tmp_prefered_lft); 1334 if (IS_ERR(ift)) { 1335 in6_ifa_put(ifp); 1336 in6_dev_put(idev); 1337 pr_info("%s: retry temporary address regeneration\n", __func__); 1338 tmpaddr = &addr; 1339 write_lock_bh(&idev->lock); 1340 goto retry; 1341 } 1342 1343 spin_lock_bh(&ift->lock); 1344 ift->ifpub = ifp; 1345 ift->cstamp = now; 1346 ift->tstamp = tmp_tstamp; 1347 spin_unlock_bh(&ift->lock); 1348 1349 addrconf_dad_start(ift); 1350 in6_ifa_put(ift); 1351 in6_dev_put(idev); 1352 out: 1353 return ret; 1354 } 1355 1356 /* 1357 * Choose an appropriate source address (RFC3484) 1358 */ 1359 enum { 1360 IPV6_SADDR_RULE_INIT = 0, 1361 IPV6_SADDR_RULE_LOCAL, 1362 IPV6_SADDR_RULE_SCOPE, 1363 IPV6_SADDR_RULE_PREFERRED, 1364 #ifdef CONFIG_IPV6_MIP6 1365 IPV6_SADDR_RULE_HOA, 1366 #endif 1367 IPV6_SADDR_RULE_OIF, 1368 IPV6_SADDR_RULE_LABEL, 1369 IPV6_SADDR_RULE_PRIVACY, 1370 IPV6_SADDR_RULE_ORCHID, 1371 IPV6_SADDR_RULE_PREFIX, 1372 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1374 #endif 1375 IPV6_SADDR_RULE_MAX 1376 }; 1377 1378 struct ipv6_saddr_score { 1379 int rule; 1380 int addr_type; 1381 struct inet6_ifaddr *ifa; 1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1383 int scopedist; 1384 int matchlen; 1385 }; 1386 1387 struct ipv6_saddr_dst { 1388 const struct in6_addr *addr; 1389 int ifindex; 1390 int scope; 1391 int label; 1392 unsigned int prefs; 1393 }; 1394 1395 static inline int ipv6_saddr_preferred(int type) 1396 { 1397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1398 return 1; 1399 return 0; 1400 } 1401 1402 static bool ipv6_use_optimistic_addr(struct net *net, 1403 struct inet6_dev *idev) 1404 { 1405 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1406 if (!idev) 1407 return false; 1408 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1409 return false; 1410 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1411 return false; 1412 1413 return true; 1414 #else 1415 return false; 1416 #endif 1417 } 1418 1419 static int ipv6_get_saddr_eval(struct net *net, 1420 struct ipv6_saddr_score *score, 1421 struct ipv6_saddr_dst *dst, 1422 int i) 1423 { 1424 int ret; 1425 1426 if (i <= score->rule) { 1427 switch (i) { 1428 case IPV6_SADDR_RULE_SCOPE: 1429 ret = score->scopedist; 1430 break; 1431 case IPV6_SADDR_RULE_PREFIX: 1432 ret = score->matchlen; 1433 break; 1434 default: 1435 ret = !!test_bit(i, score->scorebits); 1436 } 1437 goto out; 1438 } 1439 1440 switch (i) { 1441 case IPV6_SADDR_RULE_INIT: 1442 /* Rule 0: remember if hiscore is not ready yet */ 1443 ret = !!score->ifa; 1444 break; 1445 case IPV6_SADDR_RULE_LOCAL: 1446 /* Rule 1: Prefer same address */ 1447 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1448 break; 1449 case IPV6_SADDR_RULE_SCOPE: 1450 /* Rule 2: Prefer appropriate scope 1451 * 1452 * ret 1453 * ^ 1454 * -1 | d 15 1455 * ---+--+-+---> scope 1456 * | 1457 * | d is scope of the destination. 1458 * B-d | \ 1459 * | \ <- smaller scope is better if 1460 * B-15 | \ if scope is enough for destination. 1461 * | ret = B - scope (-1 <= scope >= d <= 15). 1462 * d-C-1 | / 1463 * |/ <- greater is better 1464 * -C / if scope is not enough for destination. 1465 * /| ret = scope - C (-1 <= d < scope <= 15). 1466 * 1467 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1468 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1469 * Assume B = 0 and we get C > 29. 1470 */ 1471 ret = __ipv6_addr_src_scope(score->addr_type); 1472 if (ret >= dst->scope) 1473 ret = -ret; 1474 else 1475 ret -= 128; /* 30 is enough */ 1476 score->scopedist = ret; 1477 break; 1478 case IPV6_SADDR_RULE_PREFERRED: 1479 { 1480 /* Rule 3: Avoid deprecated and optimistic addresses */ 1481 u8 avoid = IFA_F_DEPRECATED; 1482 1483 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1484 avoid |= IFA_F_OPTIMISTIC; 1485 ret = ipv6_saddr_preferred(score->addr_type) || 1486 !(score->ifa->flags & avoid); 1487 break; 1488 } 1489 #ifdef CONFIG_IPV6_MIP6 1490 case IPV6_SADDR_RULE_HOA: 1491 { 1492 /* Rule 4: Prefer home address */ 1493 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1494 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1495 break; 1496 } 1497 #endif 1498 case IPV6_SADDR_RULE_OIF: 1499 /* Rule 5: Prefer outgoing interface */ 1500 ret = (!dst->ifindex || 1501 dst->ifindex == score->ifa->idev->dev->ifindex); 1502 break; 1503 case IPV6_SADDR_RULE_LABEL: 1504 /* Rule 6: Prefer matching label */ 1505 ret = ipv6_addr_label(net, 1506 &score->ifa->addr, score->addr_type, 1507 score->ifa->idev->dev->ifindex) == dst->label; 1508 break; 1509 case IPV6_SADDR_RULE_PRIVACY: 1510 { 1511 /* Rule 7: Prefer public address 1512 * Note: prefer temporary address if use_tempaddr >= 2 1513 */ 1514 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1515 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1516 score->ifa->idev->cnf.use_tempaddr >= 2; 1517 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1518 break; 1519 } 1520 case IPV6_SADDR_RULE_ORCHID: 1521 /* Rule 8-: Prefer ORCHID vs ORCHID or 1522 * non-ORCHID vs non-ORCHID 1523 */ 1524 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1525 ipv6_addr_orchid(dst->addr)); 1526 break; 1527 case IPV6_SADDR_RULE_PREFIX: 1528 /* Rule 8: Use longest matching prefix */ 1529 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1530 if (ret > score->ifa->prefix_len) 1531 ret = score->ifa->prefix_len; 1532 score->matchlen = ret; 1533 break; 1534 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1535 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1536 /* Optimistic addresses still have lower precedence than other 1537 * preferred addresses. 1538 */ 1539 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1540 break; 1541 #endif 1542 default: 1543 ret = 0; 1544 } 1545 1546 if (ret) 1547 __set_bit(i, score->scorebits); 1548 score->rule = i; 1549 out: 1550 return ret; 1551 } 1552 1553 static int __ipv6_dev_get_saddr(struct net *net, 1554 struct ipv6_saddr_dst *dst, 1555 struct inet6_dev *idev, 1556 struct ipv6_saddr_score *scores, 1557 int hiscore_idx) 1558 { 1559 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1560 1561 read_lock_bh(&idev->lock); 1562 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1563 int i; 1564 1565 /* 1566 * - Tentative Address (RFC2462 section 5.4) 1567 * - A tentative address is not considered 1568 * "assigned to an interface" in the traditional 1569 * sense, unless it is also flagged as optimistic. 1570 * - Candidate Source Address (section 4) 1571 * - In any case, anycast addresses, multicast 1572 * addresses, and the unspecified address MUST 1573 * NOT be included in a candidate set. 1574 */ 1575 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1576 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1577 continue; 1578 1579 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1580 1581 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1582 score->addr_type & IPV6_ADDR_MULTICAST)) { 1583 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1584 idev->dev->name); 1585 continue; 1586 } 1587 1588 score->rule = -1; 1589 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1590 1591 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1592 int minihiscore, miniscore; 1593 1594 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1595 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1596 1597 if (minihiscore > miniscore) { 1598 if (i == IPV6_SADDR_RULE_SCOPE && 1599 score->scopedist > 0) { 1600 /* 1601 * special case: 1602 * each remaining entry 1603 * has too small (not enough) 1604 * scope, because ifa entries 1605 * are sorted by their scope 1606 * values. 1607 */ 1608 goto out; 1609 } 1610 break; 1611 } else if (minihiscore < miniscore) { 1612 if (hiscore->ifa) 1613 in6_ifa_put(hiscore->ifa); 1614 1615 in6_ifa_hold(score->ifa); 1616 1617 swap(hiscore, score); 1618 hiscore_idx = 1 - hiscore_idx; 1619 1620 /* restore our iterator */ 1621 score->ifa = hiscore->ifa; 1622 1623 break; 1624 } 1625 } 1626 } 1627 out: 1628 read_unlock_bh(&idev->lock); 1629 return hiscore_idx; 1630 } 1631 1632 static int ipv6_get_saddr_master(struct net *net, 1633 const struct net_device *dst_dev, 1634 const struct net_device *master, 1635 struct ipv6_saddr_dst *dst, 1636 struct ipv6_saddr_score *scores, 1637 int hiscore_idx) 1638 { 1639 struct inet6_dev *idev; 1640 1641 idev = __in6_dev_get(dst_dev); 1642 if (idev) 1643 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1644 scores, hiscore_idx); 1645 1646 idev = __in6_dev_get(master); 1647 if (idev) 1648 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1649 scores, hiscore_idx); 1650 1651 return hiscore_idx; 1652 } 1653 1654 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1655 const struct in6_addr *daddr, unsigned int prefs, 1656 struct in6_addr *saddr) 1657 { 1658 struct ipv6_saddr_score scores[2], *hiscore; 1659 struct ipv6_saddr_dst dst; 1660 struct inet6_dev *idev; 1661 struct net_device *dev; 1662 int dst_type; 1663 bool use_oif_addr = false; 1664 int hiscore_idx = 0; 1665 1666 dst_type = __ipv6_addr_type(daddr); 1667 dst.addr = daddr; 1668 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1669 dst.scope = __ipv6_addr_src_scope(dst_type); 1670 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1671 dst.prefs = prefs; 1672 1673 scores[hiscore_idx].rule = -1; 1674 scores[hiscore_idx].ifa = NULL; 1675 1676 rcu_read_lock(); 1677 1678 /* Candidate Source Address (section 4) 1679 * - multicast and link-local destination address, 1680 * the set of candidate source address MUST only 1681 * include addresses assigned to interfaces 1682 * belonging to the same link as the outgoing 1683 * interface. 1684 * (- For site-local destination addresses, the 1685 * set of candidate source addresses MUST only 1686 * include addresses assigned to interfaces 1687 * belonging to the same site as the outgoing 1688 * interface.) 1689 * - "It is RECOMMENDED that the candidate source addresses 1690 * be the set of unicast addresses assigned to the 1691 * interface that will be used to send to the destination 1692 * (the 'outgoing' interface)." (RFC 6724) 1693 */ 1694 if (dst_dev) { 1695 idev = __in6_dev_get(dst_dev); 1696 if ((dst_type & IPV6_ADDR_MULTICAST) || 1697 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1698 (idev && idev->cnf.use_oif_addrs_only)) { 1699 use_oif_addr = true; 1700 } 1701 } 1702 1703 if (use_oif_addr) { 1704 if (idev) 1705 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1706 } else { 1707 const struct net_device *master; 1708 int master_idx = 0; 1709 1710 /* if dst_dev exists and is enslaved to an L3 device, then 1711 * prefer addresses from dst_dev and then the master over 1712 * any other enslaved devices in the L3 domain. 1713 */ 1714 master = l3mdev_master_dev_rcu(dst_dev); 1715 if (master) { 1716 master_idx = master->ifindex; 1717 1718 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1719 master, &dst, 1720 scores, hiscore_idx); 1721 1722 if (scores[hiscore_idx].ifa) 1723 goto out; 1724 } 1725 1726 for_each_netdev_rcu(net, dev) { 1727 /* only consider addresses on devices in the 1728 * same L3 domain 1729 */ 1730 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1731 continue; 1732 idev = __in6_dev_get(dev); 1733 if (!idev) 1734 continue; 1735 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1736 } 1737 } 1738 1739 out: 1740 rcu_read_unlock(); 1741 1742 hiscore = &scores[hiscore_idx]; 1743 if (!hiscore->ifa) 1744 return -EADDRNOTAVAIL; 1745 1746 *saddr = hiscore->ifa->addr; 1747 in6_ifa_put(hiscore->ifa); 1748 return 0; 1749 } 1750 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1751 1752 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1753 u32 banned_flags) 1754 { 1755 struct inet6_ifaddr *ifp; 1756 int err = -EADDRNOTAVAIL; 1757 1758 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1759 if (ifp->scope > IFA_LINK) 1760 break; 1761 if (ifp->scope == IFA_LINK && 1762 !(ifp->flags & banned_flags)) { 1763 *addr = ifp->addr; 1764 err = 0; 1765 break; 1766 } 1767 } 1768 return err; 1769 } 1770 1771 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1772 u32 banned_flags) 1773 { 1774 struct inet6_dev *idev; 1775 int err = -EADDRNOTAVAIL; 1776 1777 rcu_read_lock(); 1778 idev = __in6_dev_get(dev); 1779 if (idev) { 1780 read_lock_bh(&idev->lock); 1781 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1782 read_unlock_bh(&idev->lock); 1783 } 1784 rcu_read_unlock(); 1785 return err; 1786 } 1787 1788 static int ipv6_count_addresses(struct inet6_dev *idev) 1789 { 1790 int cnt = 0; 1791 struct inet6_ifaddr *ifp; 1792 1793 read_lock_bh(&idev->lock); 1794 list_for_each_entry(ifp, &idev->addr_list, if_list) 1795 cnt++; 1796 read_unlock_bh(&idev->lock); 1797 return cnt; 1798 } 1799 1800 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1801 const struct net_device *dev, int strict) 1802 { 1803 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1804 } 1805 EXPORT_SYMBOL(ipv6_chk_addr); 1806 1807 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1808 const struct net_device *dev, int strict, 1809 u32 banned_flags) 1810 { 1811 struct inet6_ifaddr *ifp; 1812 unsigned int hash = inet6_addr_hash(addr); 1813 u32 ifp_flags; 1814 1815 rcu_read_lock_bh(); 1816 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1817 if (!net_eq(dev_net(ifp->idev->dev), net)) 1818 continue; 1819 /* Decouple optimistic from tentative for evaluation here. 1820 * Ban optimistic addresses explicitly, when required. 1821 */ 1822 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1823 ? (ifp->flags&~IFA_F_TENTATIVE) 1824 : ifp->flags; 1825 if (ipv6_addr_equal(&ifp->addr, addr) && 1826 !(ifp_flags&banned_flags) && 1827 (!dev || ifp->idev->dev == dev || 1828 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1829 rcu_read_unlock_bh(); 1830 return 1; 1831 } 1832 } 1833 1834 rcu_read_unlock_bh(); 1835 return 0; 1836 } 1837 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1838 1839 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1840 struct net_device *dev) 1841 { 1842 unsigned int hash = inet6_addr_hash(addr); 1843 struct inet6_ifaddr *ifp; 1844 1845 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1846 if (!net_eq(dev_net(ifp->idev->dev), net)) 1847 continue; 1848 if (ipv6_addr_equal(&ifp->addr, addr)) { 1849 if (!dev || ifp->idev->dev == dev) 1850 return true; 1851 } 1852 } 1853 return false; 1854 } 1855 1856 /* Compares an address/prefix_len with addresses on device @dev. 1857 * If one is found it returns true. 1858 */ 1859 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1860 const unsigned int prefix_len, struct net_device *dev) 1861 { 1862 struct inet6_dev *idev; 1863 struct inet6_ifaddr *ifa; 1864 bool ret = false; 1865 1866 rcu_read_lock(); 1867 idev = __in6_dev_get(dev); 1868 if (idev) { 1869 read_lock_bh(&idev->lock); 1870 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1871 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1872 if (ret) 1873 break; 1874 } 1875 read_unlock_bh(&idev->lock); 1876 } 1877 rcu_read_unlock(); 1878 1879 return ret; 1880 } 1881 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1882 1883 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1884 { 1885 struct inet6_dev *idev; 1886 struct inet6_ifaddr *ifa; 1887 int onlink; 1888 1889 onlink = 0; 1890 rcu_read_lock(); 1891 idev = __in6_dev_get(dev); 1892 if (idev) { 1893 read_lock_bh(&idev->lock); 1894 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1895 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1896 ifa->prefix_len); 1897 if (onlink) 1898 break; 1899 } 1900 read_unlock_bh(&idev->lock); 1901 } 1902 rcu_read_unlock(); 1903 return onlink; 1904 } 1905 EXPORT_SYMBOL(ipv6_chk_prefix); 1906 1907 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1908 struct net_device *dev, int strict) 1909 { 1910 struct inet6_ifaddr *ifp, *result = NULL; 1911 unsigned int hash = inet6_addr_hash(addr); 1912 1913 rcu_read_lock_bh(); 1914 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1915 if (!net_eq(dev_net(ifp->idev->dev), net)) 1916 continue; 1917 if (ipv6_addr_equal(&ifp->addr, addr)) { 1918 if (!dev || ifp->idev->dev == dev || 1919 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1920 result = ifp; 1921 in6_ifa_hold(ifp); 1922 break; 1923 } 1924 } 1925 } 1926 rcu_read_unlock_bh(); 1927 1928 return result; 1929 } 1930 1931 /* Gets referenced address, destroys ifaddr */ 1932 1933 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1934 { 1935 if (dad_failed) 1936 ifp->flags |= IFA_F_DADFAILED; 1937 1938 if (ifp->flags&IFA_F_TEMPORARY) { 1939 struct inet6_ifaddr *ifpub; 1940 spin_lock_bh(&ifp->lock); 1941 ifpub = ifp->ifpub; 1942 if (ifpub) { 1943 in6_ifa_hold(ifpub); 1944 spin_unlock_bh(&ifp->lock); 1945 ipv6_create_tempaddr(ifpub, ifp); 1946 in6_ifa_put(ifpub); 1947 } else { 1948 spin_unlock_bh(&ifp->lock); 1949 } 1950 ipv6_del_addr(ifp); 1951 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1952 spin_lock_bh(&ifp->lock); 1953 addrconf_del_dad_work(ifp); 1954 ifp->flags |= IFA_F_TENTATIVE; 1955 spin_unlock_bh(&ifp->lock); 1956 if (dad_failed) 1957 ipv6_ifa_notify(0, ifp); 1958 in6_ifa_put(ifp); 1959 } else { 1960 ipv6_del_addr(ifp); 1961 } 1962 } 1963 1964 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1965 { 1966 int err = -ENOENT; 1967 1968 spin_lock_bh(&ifp->lock); 1969 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1970 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1971 err = 0; 1972 } 1973 spin_unlock_bh(&ifp->lock); 1974 1975 return err; 1976 } 1977 1978 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1979 { 1980 struct inet6_dev *idev = ifp->idev; 1981 struct net *net = dev_net(ifp->idev->dev); 1982 1983 if (addrconf_dad_end(ifp)) { 1984 in6_ifa_put(ifp); 1985 return; 1986 } 1987 1988 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1989 ifp->idev->dev->name, &ifp->addr); 1990 1991 spin_lock_bh(&ifp->lock); 1992 1993 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1994 int scope = ifp->scope; 1995 u32 flags = ifp->flags; 1996 struct in6_addr new_addr; 1997 struct inet6_ifaddr *ifp2; 1998 u32 valid_lft, preferred_lft; 1999 int pfxlen = ifp->prefix_len; 2000 int retries = ifp->stable_privacy_retry + 1; 2001 2002 if (retries > net->ipv6.sysctl.idgen_retries) { 2003 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2004 ifp->idev->dev->name); 2005 goto errdad; 2006 } 2007 2008 new_addr = ifp->addr; 2009 if (ipv6_generate_stable_address(&new_addr, retries, 2010 idev)) 2011 goto errdad; 2012 2013 valid_lft = ifp->valid_lft; 2014 preferred_lft = ifp->prefered_lft; 2015 2016 spin_unlock_bh(&ifp->lock); 2017 2018 if (idev->cnf.max_addresses && 2019 ipv6_count_addresses(idev) >= 2020 idev->cnf.max_addresses) 2021 goto lock_errdad; 2022 2023 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2024 ifp->idev->dev->name); 2025 2026 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2027 scope, flags, valid_lft, 2028 preferred_lft); 2029 if (IS_ERR(ifp2)) 2030 goto lock_errdad; 2031 2032 spin_lock_bh(&ifp2->lock); 2033 ifp2->stable_privacy_retry = retries; 2034 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2035 spin_unlock_bh(&ifp2->lock); 2036 2037 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2038 in6_ifa_put(ifp2); 2039 lock_errdad: 2040 spin_lock_bh(&ifp->lock); 2041 } 2042 2043 errdad: 2044 /* transition from _POSTDAD to _ERRDAD */ 2045 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2046 spin_unlock_bh(&ifp->lock); 2047 2048 addrconf_mod_dad_work(ifp, 0); 2049 in6_ifa_put(ifp); 2050 } 2051 2052 /* Join to solicited addr multicast group. 2053 * caller must hold RTNL */ 2054 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2055 { 2056 struct in6_addr maddr; 2057 2058 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2059 return; 2060 2061 addrconf_addr_solict_mult(addr, &maddr); 2062 ipv6_dev_mc_inc(dev, &maddr); 2063 } 2064 2065 /* caller must hold RTNL */ 2066 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2067 { 2068 struct in6_addr maddr; 2069 2070 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2071 return; 2072 2073 addrconf_addr_solict_mult(addr, &maddr); 2074 __ipv6_dev_mc_dec(idev, &maddr); 2075 } 2076 2077 /* caller must hold RTNL */ 2078 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2079 { 2080 struct in6_addr addr; 2081 2082 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2083 return; 2084 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2085 if (ipv6_addr_any(&addr)) 2086 return; 2087 __ipv6_dev_ac_inc(ifp->idev, &addr); 2088 } 2089 2090 /* caller must hold RTNL */ 2091 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2092 { 2093 struct in6_addr addr; 2094 2095 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2096 return; 2097 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2098 if (ipv6_addr_any(&addr)) 2099 return; 2100 __ipv6_dev_ac_dec(ifp->idev, &addr); 2101 } 2102 2103 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2104 { 2105 switch (dev->addr_len) { 2106 case ETH_ALEN: 2107 memcpy(eui, dev->dev_addr, 3); 2108 eui[3] = 0xFF; 2109 eui[4] = 0xFE; 2110 memcpy(eui + 5, dev->dev_addr + 3, 3); 2111 break; 2112 case EUI64_ADDR_LEN: 2113 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2114 eui[0] ^= 2; 2115 break; 2116 default: 2117 return -1; 2118 } 2119 2120 return 0; 2121 } 2122 2123 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2124 { 2125 union fwnet_hwaddr *ha; 2126 2127 if (dev->addr_len != FWNET_ALEN) 2128 return -1; 2129 2130 ha = (union fwnet_hwaddr *)dev->dev_addr; 2131 2132 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2133 eui[0] ^= 2; 2134 return 0; 2135 } 2136 2137 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2138 { 2139 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2140 if (dev->addr_len != ARCNET_ALEN) 2141 return -1; 2142 memset(eui, 0, 7); 2143 eui[7] = *(u8 *)dev->dev_addr; 2144 return 0; 2145 } 2146 2147 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2148 { 2149 if (dev->addr_len != INFINIBAND_ALEN) 2150 return -1; 2151 memcpy(eui, dev->dev_addr + 12, 8); 2152 eui[0] |= 2; 2153 return 0; 2154 } 2155 2156 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2157 { 2158 if (addr == 0) 2159 return -1; 2160 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2161 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2162 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2163 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2164 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2165 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2166 eui[1] = 0; 2167 eui[2] = 0x5E; 2168 eui[3] = 0xFE; 2169 memcpy(eui + 4, &addr, 4); 2170 return 0; 2171 } 2172 2173 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2174 { 2175 if (dev->priv_flags & IFF_ISATAP) 2176 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2177 return -1; 2178 } 2179 2180 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2181 { 2182 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2183 } 2184 2185 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2186 { 2187 memcpy(eui, dev->perm_addr, 3); 2188 memcpy(eui + 5, dev->perm_addr + 3, 3); 2189 eui[3] = 0xFF; 2190 eui[4] = 0xFE; 2191 eui[0] ^= 2; 2192 return 0; 2193 } 2194 2195 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2196 { 2197 switch (dev->type) { 2198 case ARPHRD_ETHER: 2199 case ARPHRD_FDDI: 2200 return addrconf_ifid_eui48(eui, dev); 2201 case ARPHRD_ARCNET: 2202 return addrconf_ifid_arcnet(eui, dev); 2203 case ARPHRD_INFINIBAND: 2204 return addrconf_ifid_infiniband(eui, dev); 2205 case ARPHRD_SIT: 2206 return addrconf_ifid_sit(eui, dev); 2207 case ARPHRD_IPGRE: 2208 case ARPHRD_TUNNEL: 2209 return addrconf_ifid_gre(eui, dev); 2210 case ARPHRD_6LOWPAN: 2211 return addrconf_ifid_6lowpan(eui, dev); 2212 case ARPHRD_IEEE1394: 2213 return addrconf_ifid_ieee1394(eui, dev); 2214 case ARPHRD_TUNNEL6: 2215 case ARPHRD_IP6GRE: 2216 return addrconf_ifid_ip6tnl(eui, dev); 2217 } 2218 return -1; 2219 } 2220 2221 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2222 { 2223 int err = -1; 2224 struct inet6_ifaddr *ifp; 2225 2226 read_lock_bh(&idev->lock); 2227 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2228 if (ifp->scope > IFA_LINK) 2229 break; 2230 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2231 memcpy(eui, ifp->addr.s6_addr+8, 8); 2232 err = 0; 2233 break; 2234 } 2235 } 2236 read_unlock_bh(&idev->lock); 2237 return err; 2238 } 2239 2240 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2241 static void ipv6_regen_rndid(struct inet6_dev *idev) 2242 { 2243 regen: 2244 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2245 idev->rndid[0] &= ~0x02; 2246 2247 /* 2248 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2249 * check if generated address is not inappropriate 2250 * 2251 * - Reserved subnet anycast (RFC 2526) 2252 * 11111101 11....11 1xxxxxxx 2253 * - ISATAP (RFC4214) 6.1 2254 * 00-00-5E-FE-xx-xx-xx-xx 2255 * - value 0 2256 * - XXX: already assigned to an address on the device 2257 */ 2258 if (idev->rndid[0] == 0xfd && 2259 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2260 (idev->rndid[7]&0x80)) 2261 goto regen; 2262 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2263 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2264 goto regen; 2265 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2266 goto regen; 2267 } 2268 } 2269 2270 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2271 { 2272 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2273 ipv6_regen_rndid(idev); 2274 } 2275 2276 /* 2277 * Add prefix route. 2278 */ 2279 2280 static void 2281 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2282 unsigned long expires, u32 flags) 2283 { 2284 struct fib6_config cfg = { 2285 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2286 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2287 .fc_ifindex = dev->ifindex, 2288 .fc_expires = expires, 2289 .fc_dst_len = plen, 2290 .fc_flags = RTF_UP | flags, 2291 .fc_nlinfo.nl_net = dev_net(dev), 2292 .fc_protocol = RTPROT_KERNEL, 2293 }; 2294 2295 cfg.fc_dst = *pfx; 2296 2297 /* Prevent useless cloning on PtP SIT. 2298 This thing is done here expecting that the whole 2299 class of non-broadcast devices need not cloning. 2300 */ 2301 #if IS_ENABLED(CONFIG_IPV6_SIT) 2302 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2303 cfg.fc_flags |= RTF_NONEXTHOP; 2304 #endif 2305 2306 ip6_route_add(&cfg, NULL); 2307 } 2308 2309 2310 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2311 int plen, 2312 const struct net_device *dev, 2313 u32 flags, u32 noflags) 2314 { 2315 struct fib6_node *fn; 2316 struct rt6_info *rt = NULL; 2317 struct fib6_table *table; 2318 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2319 2320 table = fib6_get_table(dev_net(dev), tb_id); 2321 if (!table) 2322 return NULL; 2323 2324 read_lock_bh(&table->tb6_lock); 2325 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2326 if (!fn) 2327 goto out; 2328 2329 noflags |= RTF_CACHE; 2330 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2331 if (rt->dst.dev->ifindex != dev->ifindex) 2332 continue; 2333 if ((rt->rt6i_flags & flags) != flags) 2334 continue; 2335 if ((rt->rt6i_flags & noflags) != 0) 2336 continue; 2337 dst_hold(&rt->dst); 2338 break; 2339 } 2340 out: 2341 read_unlock_bh(&table->tb6_lock); 2342 return rt; 2343 } 2344 2345 2346 /* Create "default" multicast route to the interface */ 2347 2348 static void addrconf_add_mroute(struct net_device *dev) 2349 { 2350 struct fib6_config cfg = { 2351 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2352 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2353 .fc_ifindex = dev->ifindex, 2354 .fc_dst_len = 8, 2355 .fc_flags = RTF_UP, 2356 .fc_nlinfo.nl_net = dev_net(dev), 2357 }; 2358 2359 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2360 2361 ip6_route_add(&cfg, NULL); 2362 } 2363 2364 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2365 { 2366 struct inet6_dev *idev; 2367 2368 ASSERT_RTNL(); 2369 2370 idev = ipv6_find_idev(dev); 2371 if (!idev) 2372 return ERR_PTR(-ENOBUFS); 2373 2374 if (idev->cnf.disable_ipv6) 2375 return ERR_PTR(-EACCES); 2376 2377 /* Add default multicast route */ 2378 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2379 addrconf_add_mroute(dev); 2380 2381 return idev; 2382 } 2383 2384 static void manage_tempaddrs(struct inet6_dev *idev, 2385 struct inet6_ifaddr *ifp, 2386 __u32 valid_lft, __u32 prefered_lft, 2387 bool create, unsigned long now) 2388 { 2389 u32 flags; 2390 struct inet6_ifaddr *ift; 2391 2392 read_lock_bh(&idev->lock); 2393 /* update all temporary addresses in the list */ 2394 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2395 int age, max_valid, max_prefered; 2396 2397 if (ifp != ift->ifpub) 2398 continue; 2399 2400 /* RFC 4941 section 3.3: 2401 * If a received option will extend the lifetime of a public 2402 * address, the lifetimes of temporary addresses should 2403 * be extended, subject to the overall constraint that no 2404 * temporary addresses should ever remain "valid" or "preferred" 2405 * for a time longer than (TEMP_VALID_LIFETIME) or 2406 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2407 */ 2408 age = (now - ift->cstamp) / HZ; 2409 max_valid = idev->cnf.temp_valid_lft - age; 2410 if (max_valid < 0) 2411 max_valid = 0; 2412 2413 max_prefered = idev->cnf.temp_prefered_lft - 2414 idev->desync_factor - age; 2415 if (max_prefered < 0) 2416 max_prefered = 0; 2417 2418 if (valid_lft > max_valid) 2419 valid_lft = max_valid; 2420 2421 if (prefered_lft > max_prefered) 2422 prefered_lft = max_prefered; 2423 2424 spin_lock(&ift->lock); 2425 flags = ift->flags; 2426 ift->valid_lft = valid_lft; 2427 ift->prefered_lft = prefered_lft; 2428 ift->tstamp = now; 2429 if (prefered_lft > 0) 2430 ift->flags &= ~IFA_F_DEPRECATED; 2431 2432 spin_unlock(&ift->lock); 2433 if (!(flags&IFA_F_TENTATIVE)) 2434 ipv6_ifa_notify(0, ift); 2435 } 2436 2437 if ((create || list_empty(&idev->tempaddr_list)) && 2438 idev->cnf.use_tempaddr > 0) { 2439 /* When a new public address is created as described 2440 * in [ADDRCONF], also create a new temporary address. 2441 * Also create a temporary address if it's enabled but 2442 * no temporary address currently exists. 2443 */ 2444 read_unlock_bh(&idev->lock); 2445 ipv6_create_tempaddr(ifp, NULL); 2446 } else { 2447 read_unlock_bh(&idev->lock); 2448 } 2449 } 2450 2451 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2452 { 2453 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2454 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2455 } 2456 2457 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2458 const struct prefix_info *pinfo, 2459 struct inet6_dev *in6_dev, 2460 const struct in6_addr *addr, int addr_type, 2461 u32 addr_flags, bool sllao, bool tokenized, 2462 __u32 valid_lft, u32 prefered_lft) 2463 { 2464 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2465 int create = 0, update_lft = 0; 2466 2467 if (!ifp && valid_lft) { 2468 int max_addresses = in6_dev->cnf.max_addresses; 2469 2470 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2471 if ((net->ipv6.devconf_all->optimistic_dad || 2472 in6_dev->cnf.optimistic_dad) && 2473 !net->ipv6.devconf_all->forwarding && sllao) 2474 addr_flags |= IFA_F_OPTIMISTIC; 2475 #endif 2476 2477 /* Do not allow to create too much of autoconfigured 2478 * addresses; this would be too easy way to crash kernel. 2479 */ 2480 if (!max_addresses || 2481 ipv6_count_addresses(in6_dev) < max_addresses) 2482 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2483 pinfo->prefix_len, 2484 addr_type&IPV6_ADDR_SCOPE_MASK, 2485 addr_flags, valid_lft, 2486 prefered_lft); 2487 2488 if (IS_ERR_OR_NULL(ifp)) 2489 return -1; 2490 2491 update_lft = 0; 2492 create = 1; 2493 spin_lock_bh(&ifp->lock); 2494 ifp->flags |= IFA_F_MANAGETEMPADDR; 2495 ifp->cstamp = jiffies; 2496 ifp->tokenized = tokenized; 2497 spin_unlock_bh(&ifp->lock); 2498 addrconf_dad_start(ifp); 2499 } 2500 2501 if (ifp) { 2502 u32 flags; 2503 unsigned long now; 2504 u32 stored_lft; 2505 2506 /* update lifetime (RFC2462 5.5.3 e) */ 2507 spin_lock_bh(&ifp->lock); 2508 now = jiffies; 2509 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2510 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2511 else 2512 stored_lft = 0; 2513 if (!update_lft && !create && stored_lft) { 2514 const u32 minimum_lft = min_t(u32, 2515 stored_lft, MIN_VALID_LIFETIME); 2516 valid_lft = max(valid_lft, minimum_lft); 2517 2518 /* RFC4862 Section 5.5.3e: 2519 * "Note that the preferred lifetime of the 2520 * corresponding address is always reset to 2521 * the Preferred Lifetime in the received 2522 * Prefix Information option, regardless of 2523 * whether the valid lifetime is also reset or 2524 * ignored." 2525 * 2526 * So we should always update prefered_lft here. 2527 */ 2528 update_lft = 1; 2529 } 2530 2531 if (update_lft) { 2532 ifp->valid_lft = valid_lft; 2533 ifp->prefered_lft = prefered_lft; 2534 ifp->tstamp = now; 2535 flags = ifp->flags; 2536 ifp->flags &= ~IFA_F_DEPRECATED; 2537 spin_unlock_bh(&ifp->lock); 2538 2539 if (!(flags&IFA_F_TENTATIVE)) 2540 ipv6_ifa_notify(0, ifp); 2541 } else 2542 spin_unlock_bh(&ifp->lock); 2543 2544 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2545 create, now); 2546 2547 in6_ifa_put(ifp); 2548 addrconf_verify(); 2549 } 2550 2551 return 0; 2552 } 2553 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2554 2555 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2556 { 2557 struct prefix_info *pinfo; 2558 __u32 valid_lft; 2559 __u32 prefered_lft; 2560 int addr_type, err; 2561 u32 addr_flags = 0; 2562 struct inet6_dev *in6_dev; 2563 struct net *net = dev_net(dev); 2564 2565 pinfo = (struct prefix_info *) opt; 2566 2567 if (len < sizeof(struct prefix_info)) { 2568 ADBG("addrconf: prefix option too short\n"); 2569 return; 2570 } 2571 2572 /* 2573 * Validation checks ([ADDRCONF], page 19) 2574 */ 2575 2576 addr_type = ipv6_addr_type(&pinfo->prefix); 2577 2578 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2579 return; 2580 2581 valid_lft = ntohl(pinfo->valid); 2582 prefered_lft = ntohl(pinfo->prefered); 2583 2584 if (prefered_lft > valid_lft) { 2585 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2586 return; 2587 } 2588 2589 in6_dev = in6_dev_get(dev); 2590 2591 if (!in6_dev) { 2592 net_dbg_ratelimited("addrconf: device %s not configured\n", 2593 dev->name); 2594 return; 2595 } 2596 2597 /* 2598 * Two things going on here: 2599 * 1) Add routes for on-link prefixes 2600 * 2) Configure prefixes with the auto flag set 2601 */ 2602 2603 if (pinfo->onlink) { 2604 struct rt6_info *rt; 2605 unsigned long rt_expires; 2606 2607 /* Avoid arithmetic overflow. Really, we could 2608 * save rt_expires in seconds, likely valid_lft, 2609 * but it would require division in fib gc, that it 2610 * not good. 2611 */ 2612 if (HZ > USER_HZ) 2613 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2614 else 2615 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2616 2617 if (addrconf_finite_timeout(rt_expires)) 2618 rt_expires *= HZ; 2619 2620 rt = addrconf_get_prefix_route(&pinfo->prefix, 2621 pinfo->prefix_len, 2622 dev, 2623 RTF_ADDRCONF | RTF_PREFIX_RT, 2624 RTF_GATEWAY | RTF_DEFAULT); 2625 2626 if (rt) { 2627 /* Autoconf prefix route */ 2628 if (valid_lft == 0) { 2629 ip6_del_rt(rt); 2630 rt = NULL; 2631 } else if (addrconf_finite_timeout(rt_expires)) { 2632 /* not infinity */ 2633 rt6_set_expires(rt, jiffies + rt_expires); 2634 } else { 2635 rt6_clean_expires(rt); 2636 } 2637 } else if (valid_lft) { 2638 clock_t expires = 0; 2639 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2640 if (addrconf_finite_timeout(rt_expires)) { 2641 /* not infinity */ 2642 flags |= RTF_EXPIRES; 2643 expires = jiffies_to_clock_t(rt_expires); 2644 } 2645 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2646 dev, expires, flags); 2647 } 2648 ip6_rt_put(rt); 2649 } 2650 2651 /* Try to figure out our local address for this prefix */ 2652 2653 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2654 struct in6_addr addr; 2655 bool tokenized = false, dev_addr_generated = false; 2656 2657 if (pinfo->prefix_len == 64) { 2658 memcpy(&addr, &pinfo->prefix, 8); 2659 2660 if (!ipv6_addr_any(&in6_dev->token)) { 2661 read_lock_bh(&in6_dev->lock); 2662 memcpy(addr.s6_addr + 8, 2663 in6_dev->token.s6_addr + 8, 8); 2664 read_unlock_bh(&in6_dev->lock); 2665 tokenized = true; 2666 } else if (is_addr_mode_generate_stable(in6_dev) && 2667 !ipv6_generate_stable_address(&addr, 0, 2668 in6_dev)) { 2669 addr_flags |= IFA_F_STABLE_PRIVACY; 2670 goto ok; 2671 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2672 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2673 goto put; 2674 } else { 2675 dev_addr_generated = true; 2676 } 2677 goto ok; 2678 } 2679 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2680 pinfo->prefix_len); 2681 goto put; 2682 2683 ok: 2684 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2685 &addr, addr_type, 2686 addr_flags, sllao, 2687 tokenized, valid_lft, 2688 prefered_lft); 2689 if (err) 2690 goto put; 2691 2692 /* Ignore error case here because previous prefix add addr was 2693 * successful which will be notified. 2694 */ 2695 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2696 addr_type, addr_flags, sllao, 2697 tokenized, valid_lft, 2698 prefered_lft, 2699 dev_addr_generated); 2700 } 2701 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2702 put: 2703 in6_dev_put(in6_dev); 2704 } 2705 2706 /* 2707 * Set destination address. 2708 * Special case for SIT interfaces where we create a new "virtual" 2709 * device. 2710 */ 2711 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2712 { 2713 struct in6_ifreq ireq; 2714 struct net_device *dev; 2715 int err = -EINVAL; 2716 2717 rtnl_lock(); 2718 2719 err = -EFAULT; 2720 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2721 goto err_exit; 2722 2723 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2724 2725 err = -ENODEV; 2726 if (!dev) 2727 goto err_exit; 2728 2729 #if IS_ENABLED(CONFIG_IPV6_SIT) 2730 if (dev->type == ARPHRD_SIT) { 2731 const struct net_device_ops *ops = dev->netdev_ops; 2732 struct ifreq ifr; 2733 struct ip_tunnel_parm p; 2734 2735 err = -EADDRNOTAVAIL; 2736 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2737 goto err_exit; 2738 2739 memset(&p, 0, sizeof(p)); 2740 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2741 p.iph.saddr = 0; 2742 p.iph.version = 4; 2743 p.iph.ihl = 5; 2744 p.iph.protocol = IPPROTO_IPV6; 2745 p.iph.ttl = 64; 2746 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2747 2748 if (ops->ndo_do_ioctl) { 2749 mm_segment_t oldfs = get_fs(); 2750 2751 set_fs(KERNEL_DS); 2752 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2753 set_fs(oldfs); 2754 } else 2755 err = -EOPNOTSUPP; 2756 2757 if (err == 0) { 2758 err = -ENOBUFS; 2759 dev = __dev_get_by_name(net, p.name); 2760 if (!dev) 2761 goto err_exit; 2762 err = dev_open(dev); 2763 } 2764 } 2765 #endif 2766 2767 err_exit: 2768 rtnl_unlock(); 2769 return err; 2770 } 2771 2772 static int ipv6_mc_config(struct sock *sk, bool join, 2773 const struct in6_addr *addr, int ifindex) 2774 { 2775 int ret; 2776 2777 ASSERT_RTNL(); 2778 2779 lock_sock(sk); 2780 if (join) 2781 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2782 else 2783 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2784 release_sock(sk); 2785 2786 return ret; 2787 } 2788 2789 /* 2790 * Manual configuration of address on an interface 2791 */ 2792 static int inet6_addr_add(struct net *net, int ifindex, 2793 const struct in6_addr *pfx, 2794 const struct in6_addr *peer_pfx, 2795 unsigned int plen, __u32 ifa_flags, 2796 __u32 prefered_lft, __u32 valid_lft) 2797 { 2798 struct inet6_ifaddr *ifp; 2799 struct inet6_dev *idev; 2800 struct net_device *dev; 2801 unsigned long timeout; 2802 clock_t expires; 2803 int scope; 2804 u32 flags; 2805 2806 ASSERT_RTNL(); 2807 2808 if (plen > 128) 2809 return -EINVAL; 2810 2811 /* check the lifetime */ 2812 if (!valid_lft || prefered_lft > valid_lft) 2813 return -EINVAL; 2814 2815 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2816 return -EINVAL; 2817 2818 dev = __dev_get_by_index(net, ifindex); 2819 if (!dev) 2820 return -ENODEV; 2821 2822 idev = addrconf_add_dev(dev); 2823 if (IS_ERR(idev)) 2824 return PTR_ERR(idev); 2825 2826 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2827 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2828 true, pfx, ifindex); 2829 2830 if (ret < 0) 2831 return ret; 2832 } 2833 2834 scope = ipv6_addr_scope(pfx); 2835 2836 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2837 if (addrconf_finite_timeout(timeout)) { 2838 expires = jiffies_to_clock_t(timeout * HZ); 2839 valid_lft = timeout; 2840 flags = RTF_EXPIRES; 2841 } else { 2842 expires = 0; 2843 flags = 0; 2844 ifa_flags |= IFA_F_PERMANENT; 2845 } 2846 2847 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2848 if (addrconf_finite_timeout(timeout)) { 2849 if (timeout == 0) 2850 ifa_flags |= IFA_F_DEPRECATED; 2851 prefered_lft = timeout; 2852 } 2853 2854 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2855 valid_lft, prefered_lft); 2856 2857 if (!IS_ERR(ifp)) { 2858 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2859 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2860 expires, flags); 2861 } 2862 2863 /* 2864 * Note that section 3.1 of RFC 4429 indicates 2865 * that the Optimistic flag should not be set for 2866 * manually configured addresses 2867 */ 2868 addrconf_dad_start(ifp); 2869 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2870 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2871 true, jiffies); 2872 in6_ifa_put(ifp); 2873 addrconf_verify_rtnl(); 2874 return 0; 2875 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2876 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2877 false, pfx, ifindex); 2878 } 2879 2880 return PTR_ERR(ifp); 2881 } 2882 2883 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2884 const struct in6_addr *pfx, unsigned int plen) 2885 { 2886 struct inet6_ifaddr *ifp; 2887 struct inet6_dev *idev; 2888 struct net_device *dev; 2889 2890 if (plen > 128) 2891 return -EINVAL; 2892 2893 dev = __dev_get_by_index(net, ifindex); 2894 if (!dev) 2895 return -ENODEV; 2896 2897 idev = __in6_dev_get(dev); 2898 if (!idev) 2899 return -ENXIO; 2900 2901 read_lock_bh(&idev->lock); 2902 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2903 if (ifp->prefix_len == plen && 2904 ipv6_addr_equal(pfx, &ifp->addr)) { 2905 in6_ifa_hold(ifp); 2906 read_unlock_bh(&idev->lock); 2907 2908 if (!(ifp->flags & IFA_F_TEMPORARY) && 2909 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2910 manage_tempaddrs(idev, ifp, 0, 0, false, 2911 jiffies); 2912 ipv6_del_addr(ifp); 2913 addrconf_verify_rtnl(); 2914 if (ipv6_addr_is_multicast(pfx)) { 2915 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2916 false, pfx, dev->ifindex); 2917 } 2918 return 0; 2919 } 2920 } 2921 read_unlock_bh(&idev->lock); 2922 return -EADDRNOTAVAIL; 2923 } 2924 2925 2926 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2927 { 2928 struct in6_ifreq ireq; 2929 int err; 2930 2931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2932 return -EPERM; 2933 2934 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2935 return -EFAULT; 2936 2937 rtnl_lock(); 2938 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2939 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2940 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2941 rtnl_unlock(); 2942 return err; 2943 } 2944 2945 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2946 { 2947 struct in6_ifreq ireq; 2948 int err; 2949 2950 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2951 return -EPERM; 2952 2953 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2954 return -EFAULT; 2955 2956 rtnl_lock(); 2957 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2958 ireq.ifr6_prefixlen); 2959 rtnl_unlock(); 2960 return err; 2961 } 2962 2963 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2964 int plen, int scope) 2965 { 2966 struct inet6_ifaddr *ifp; 2967 2968 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2969 scope, IFA_F_PERMANENT, 2970 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2971 if (!IS_ERR(ifp)) { 2972 spin_lock_bh(&ifp->lock); 2973 ifp->flags &= ~IFA_F_TENTATIVE; 2974 spin_unlock_bh(&ifp->lock); 2975 rt_genid_bump_ipv6(dev_net(idev->dev)); 2976 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2977 in6_ifa_put(ifp); 2978 } 2979 } 2980 2981 #if IS_ENABLED(CONFIG_IPV6_SIT) 2982 static void sit_add_v4_addrs(struct inet6_dev *idev) 2983 { 2984 struct in6_addr addr; 2985 struct net_device *dev; 2986 struct net *net = dev_net(idev->dev); 2987 int scope, plen; 2988 u32 pflags = 0; 2989 2990 ASSERT_RTNL(); 2991 2992 memset(&addr, 0, sizeof(struct in6_addr)); 2993 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2994 2995 if (idev->dev->flags&IFF_POINTOPOINT) { 2996 addr.s6_addr32[0] = htonl(0xfe800000); 2997 scope = IFA_LINK; 2998 plen = 64; 2999 } else { 3000 scope = IPV6_ADDR_COMPATv4; 3001 plen = 96; 3002 pflags |= RTF_NONEXTHOP; 3003 } 3004 3005 if (addr.s6_addr32[3]) { 3006 add_addr(idev, &addr, plen, scope); 3007 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3008 return; 3009 } 3010 3011 for_each_netdev(net, dev) { 3012 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3013 if (in_dev && (dev->flags & IFF_UP)) { 3014 struct in_ifaddr *ifa; 3015 3016 int flag = scope; 3017 3018 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3019 3020 addr.s6_addr32[3] = ifa->ifa_local; 3021 3022 if (ifa->ifa_scope == RT_SCOPE_LINK) 3023 continue; 3024 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3025 if (idev->dev->flags&IFF_POINTOPOINT) 3026 continue; 3027 flag |= IFA_HOST; 3028 } 3029 3030 add_addr(idev, &addr, plen, flag); 3031 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3032 pflags); 3033 } 3034 } 3035 } 3036 } 3037 #endif 3038 3039 static void init_loopback(struct net_device *dev) 3040 { 3041 struct inet6_dev *idev; 3042 3043 /* ::1 */ 3044 3045 ASSERT_RTNL(); 3046 3047 idev = ipv6_find_idev(dev); 3048 if (!idev) { 3049 pr_debug("%s: add_dev failed\n", __func__); 3050 return; 3051 } 3052 3053 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3054 } 3055 3056 void addrconf_add_linklocal(struct inet6_dev *idev, 3057 const struct in6_addr *addr, u32 flags) 3058 { 3059 struct inet6_ifaddr *ifp; 3060 u32 addr_flags = flags | IFA_F_PERMANENT; 3061 3062 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3063 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3064 idev->cnf.optimistic_dad) && 3065 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3066 addr_flags |= IFA_F_OPTIMISTIC; 3067 #endif 3068 3069 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3070 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3071 if (!IS_ERR(ifp)) { 3072 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3073 addrconf_dad_start(ifp); 3074 in6_ifa_put(ifp); 3075 } 3076 } 3077 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3078 3079 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3080 { 3081 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3082 return true; 3083 3084 if (address.s6_addr32[2] == htonl(0x02005eff) && 3085 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3086 return true; 3087 3088 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3089 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3090 return true; 3091 3092 return false; 3093 } 3094 3095 static int ipv6_generate_stable_address(struct in6_addr *address, 3096 u8 dad_count, 3097 const struct inet6_dev *idev) 3098 { 3099 static DEFINE_SPINLOCK(lock); 3100 static __u32 digest[SHA_DIGEST_WORDS]; 3101 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3102 3103 static union { 3104 char __data[SHA_MESSAGE_BYTES]; 3105 struct { 3106 struct in6_addr secret; 3107 __be32 prefix[2]; 3108 unsigned char hwaddr[MAX_ADDR_LEN]; 3109 u8 dad_count; 3110 } __packed; 3111 } data; 3112 3113 struct in6_addr secret; 3114 struct in6_addr temp; 3115 struct net *net = dev_net(idev->dev); 3116 3117 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3118 3119 if (idev->cnf.stable_secret.initialized) 3120 secret = idev->cnf.stable_secret.secret; 3121 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3122 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3123 else 3124 return -1; 3125 3126 retry: 3127 spin_lock_bh(&lock); 3128 3129 sha_init(digest); 3130 memset(&data, 0, sizeof(data)); 3131 memset(workspace, 0, sizeof(workspace)); 3132 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3133 data.prefix[0] = address->s6_addr32[0]; 3134 data.prefix[1] = address->s6_addr32[1]; 3135 data.secret = secret; 3136 data.dad_count = dad_count; 3137 3138 sha_transform(digest, data.__data, workspace); 3139 3140 temp = *address; 3141 temp.s6_addr32[2] = (__force __be32)digest[0]; 3142 temp.s6_addr32[3] = (__force __be32)digest[1]; 3143 3144 spin_unlock_bh(&lock); 3145 3146 if (ipv6_reserved_interfaceid(temp)) { 3147 dad_count++; 3148 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3149 return -1; 3150 goto retry; 3151 } 3152 3153 *address = temp; 3154 return 0; 3155 } 3156 3157 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3158 { 3159 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3160 3161 if (s->initialized) 3162 return; 3163 s = &idev->cnf.stable_secret; 3164 get_random_bytes(&s->secret, sizeof(s->secret)); 3165 s->initialized = true; 3166 } 3167 3168 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3169 { 3170 struct in6_addr addr; 3171 3172 /* no link local addresses on L3 master devices */ 3173 if (netif_is_l3_master(idev->dev)) 3174 return; 3175 3176 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3177 3178 switch (idev->cnf.addr_gen_mode) { 3179 case IN6_ADDR_GEN_MODE_RANDOM: 3180 ipv6_gen_mode_random_init(idev); 3181 /* fallthrough */ 3182 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3183 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3184 addrconf_add_linklocal(idev, &addr, 3185 IFA_F_STABLE_PRIVACY); 3186 else if (prefix_route) 3187 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3188 break; 3189 case IN6_ADDR_GEN_MODE_EUI64: 3190 /* addrconf_add_linklocal also adds a prefix_route and we 3191 * only need to care about prefix routes if ipv6_generate_eui64 3192 * couldn't generate one. 3193 */ 3194 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3195 addrconf_add_linklocal(idev, &addr, 0); 3196 else if (prefix_route) 3197 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3198 break; 3199 case IN6_ADDR_GEN_MODE_NONE: 3200 default: 3201 /* will not add any link local address */ 3202 break; 3203 } 3204 } 3205 3206 static void addrconf_dev_config(struct net_device *dev) 3207 { 3208 struct inet6_dev *idev; 3209 3210 ASSERT_RTNL(); 3211 3212 if ((dev->type != ARPHRD_ETHER) && 3213 (dev->type != ARPHRD_FDDI) && 3214 (dev->type != ARPHRD_ARCNET) && 3215 (dev->type != ARPHRD_INFINIBAND) && 3216 (dev->type != ARPHRD_IEEE1394) && 3217 (dev->type != ARPHRD_TUNNEL6) && 3218 (dev->type != ARPHRD_6LOWPAN) && 3219 (dev->type != ARPHRD_IP6GRE) && 3220 (dev->type != ARPHRD_IPGRE) && 3221 (dev->type != ARPHRD_TUNNEL) && 3222 (dev->type != ARPHRD_NONE)) { 3223 /* Alas, we support only Ethernet autoconfiguration. */ 3224 return; 3225 } 3226 3227 idev = addrconf_add_dev(dev); 3228 if (IS_ERR(idev)) 3229 return; 3230 3231 /* this device type has no EUI support */ 3232 if (dev->type == ARPHRD_NONE && 3233 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3234 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3235 3236 addrconf_addr_gen(idev, false); 3237 } 3238 3239 #if IS_ENABLED(CONFIG_IPV6_SIT) 3240 static void addrconf_sit_config(struct net_device *dev) 3241 { 3242 struct inet6_dev *idev; 3243 3244 ASSERT_RTNL(); 3245 3246 /* 3247 * Configure the tunnel with one of our IPv4 3248 * addresses... we should configure all of 3249 * our v4 addrs in the tunnel 3250 */ 3251 3252 idev = ipv6_find_idev(dev); 3253 if (!idev) { 3254 pr_debug("%s: add_dev failed\n", __func__); 3255 return; 3256 } 3257 3258 if (dev->priv_flags & IFF_ISATAP) { 3259 addrconf_addr_gen(idev, false); 3260 return; 3261 } 3262 3263 sit_add_v4_addrs(idev); 3264 3265 if (dev->flags&IFF_POINTOPOINT) 3266 addrconf_add_mroute(dev); 3267 } 3268 #endif 3269 3270 #if IS_ENABLED(CONFIG_NET_IPGRE) 3271 static void addrconf_gre_config(struct net_device *dev) 3272 { 3273 struct inet6_dev *idev; 3274 3275 ASSERT_RTNL(); 3276 3277 idev = ipv6_find_idev(dev); 3278 if (!idev) { 3279 pr_debug("%s: add_dev failed\n", __func__); 3280 return; 3281 } 3282 3283 addrconf_addr_gen(idev, true); 3284 if (dev->flags & IFF_POINTOPOINT) 3285 addrconf_add_mroute(dev); 3286 } 3287 #endif 3288 3289 static int fixup_permanent_addr(struct inet6_dev *idev, 3290 struct inet6_ifaddr *ifp) 3291 { 3292 /* !rt6i_node means the host route was removed from the 3293 * FIB, for example, if 'lo' device is taken down. In that 3294 * case regenerate the host route. 3295 */ 3296 if (!ifp->rt || !ifp->rt->rt6i_node) { 3297 struct rt6_info *rt, *prev; 3298 3299 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3300 if (unlikely(IS_ERR(rt))) 3301 return PTR_ERR(rt); 3302 3303 /* ifp->rt can be accessed outside of rtnl */ 3304 spin_lock(&ifp->lock); 3305 prev = ifp->rt; 3306 ifp->rt = rt; 3307 spin_unlock(&ifp->lock); 3308 3309 ip6_rt_put(prev); 3310 } 3311 3312 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3314 idev->dev, 0, 0); 3315 } 3316 3317 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3318 addrconf_dad_start(ifp); 3319 3320 return 0; 3321 } 3322 3323 static void addrconf_permanent_addr(struct net_device *dev) 3324 { 3325 struct inet6_ifaddr *ifp, *tmp; 3326 struct inet6_dev *idev; 3327 3328 idev = __in6_dev_get(dev); 3329 if (!idev) 3330 return; 3331 3332 write_lock_bh(&idev->lock); 3333 3334 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3335 if ((ifp->flags & IFA_F_PERMANENT) && 3336 fixup_permanent_addr(idev, ifp) < 0) { 3337 write_unlock_bh(&idev->lock); 3338 in6_ifa_hold(ifp); 3339 ipv6_del_addr(ifp); 3340 write_lock_bh(&idev->lock); 3341 3342 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3343 idev->dev->name, &ifp->addr); 3344 } 3345 } 3346 3347 write_unlock_bh(&idev->lock); 3348 } 3349 3350 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3351 void *ptr) 3352 { 3353 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3354 struct netdev_notifier_changeupper_info *info; 3355 struct inet6_dev *idev = __in6_dev_get(dev); 3356 struct net *net = dev_net(dev); 3357 int run_pending = 0; 3358 int err; 3359 3360 switch (event) { 3361 case NETDEV_REGISTER: 3362 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3363 idev = ipv6_add_dev(dev); 3364 if (IS_ERR(idev)) 3365 return notifier_from_errno(PTR_ERR(idev)); 3366 } 3367 break; 3368 3369 case NETDEV_CHANGEMTU: 3370 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3371 if (dev->mtu < IPV6_MIN_MTU) { 3372 addrconf_ifdown(dev, dev != net->loopback_dev); 3373 break; 3374 } 3375 3376 if (idev) { 3377 rt6_mtu_change(dev, dev->mtu); 3378 idev->cnf.mtu6 = dev->mtu; 3379 break; 3380 } 3381 3382 /* allocate new idev */ 3383 idev = ipv6_add_dev(dev); 3384 if (IS_ERR(idev)) 3385 break; 3386 3387 /* device is still not ready */ 3388 if (!(idev->if_flags & IF_READY)) 3389 break; 3390 3391 run_pending = 1; 3392 3393 /* fall through */ 3394 3395 case NETDEV_UP: 3396 case NETDEV_CHANGE: 3397 if (dev->flags & IFF_SLAVE) 3398 break; 3399 3400 if (idev && idev->cnf.disable_ipv6) 3401 break; 3402 3403 if (event == NETDEV_UP) { 3404 /* restore routes for permanent addresses */ 3405 addrconf_permanent_addr(dev); 3406 3407 if (!addrconf_qdisc_ok(dev)) { 3408 /* device is not ready yet. */ 3409 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3410 dev->name); 3411 break; 3412 } 3413 3414 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3415 idev = ipv6_add_dev(dev); 3416 3417 if (!IS_ERR_OR_NULL(idev)) { 3418 idev->if_flags |= IF_READY; 3419 run_pending = 1; 3420 } 3421 } else if (event == NETDEV_CHANGE) { 3422 if (!addrconf_qdisc_ok(dev)) { 3423 /* device is still not ready. */ 3424 break; 3425 } 3426 3427 if (idev) { 3428 if (idev->if_flags & IF_READY) { 3429 /* device is already configured - 3430 * but resend MLD reports, we might 3431 * have roamed and need to update 3432 * multicast snooping switches 3433 */ 3434 ipv6_mc_up(idev); 3435 break; 3436 } 3437 idev->if_flags |= IF_READY; 3438 } 3439 3440 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3441 dev->name); 3442 3443 run_pending = 1; 3444 } 3445 3446 switch (dev->type) { 3447 #if IS_ENABLED(CONFIG_IPV6_SIT) 3448 case ARPHRD_SIT: 3449 addrconf_sit_config(dev); 3450 break; 3451 #endif 3452 #if IS_ENABLED(CONFIG_NET_IPGRE) 3453 case ARPHRD_IPGRE: 3454 addrconf_gre_config(dev); 3455 break; 3456 #endif 3457 case ARPHRD_LOOPBACK: 3458 init_loopback(dev); 3459 break; 3460 3461 default: 3462 addrconf_dev_config(dev); 3463 break; 3464 } 3465 3466 if (!IS_ERR_OR_NULL(idev)) { 3467 if (run_pending) 3468 addrconf_dad_run(idev); 3469 3470 /* 3471 * If the MTU changed during the interface down, 3472 * when the interface up, the changed MTU must be 3473 * reflected in the idev as well as routers. 3474 */ 3475 if (idev->cnf.mtu6 != dev->mtu && 3476 dev->mtu >= IPV6_MIN_MTU) { 3477 rt6_mtu_change(dev, dev->mtu); 3478 idev->cnf.mtu6 = dev->mtu; 3479 } 3480 idev->tstamp = jiffies; 3481 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3482 3483 /* 3484 * If the changed mtu during down is lower than 3485 * IPV6_MIN_MTU stop IPv6 on this interface. 3486 */ 3487 if (dev->mtu < IPV6_MIN_MTU) 3488 addrconf_ifdown(dev, dev != net->loopback_dev); 3489 } 3490 break; 3491 3492 case NETDEV_DOWN: 3493 case NETDEV_UNREGISTER: 3494 /* 3495 * Remove all addresses from this interface. 3496 */ 3497 addrconf_ifdown(dev, event != NETDEV_DOWN); 3498 break; 3499 3500 case NETDEV_CHANGENAME: 3501 if (idev) { 3502 snmp6_unregister_dev(idev); 3503 addrconf_sysctl_unregister(idev); 3504 err = addrconf_sysctl_register(idev); 3505 if (err) 3506 return notifier_from_errno(err); 3507 err = snmp6_register_dev(idev); 3508 if (err) { 3509 addrconf_sysctl_unregister(idev); 3510 return notifier_from_errno(err); 3511 } 3512 } 3513 break; 3514 3515 case NETDEV_PRE_TYPE_CHANGE: 3516 case NETDEV_POST_TYPE_CHANGE: 3517 if (idev) 3518 addrconf_type_change(dev, event); 3519 break; 3520 3521 case NETDEV_CHANGEUPPER: 3522 info = ptr; 3523 3524 /* flush all routes if dev is linked to or unlinked from 3525 * an L3 master device (e.g., VRF) 3526 */ 3527 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3528 addrconf_ifdown(dev, 0); 3529 } 3530 3531 return NOTIFY_OK; 3532 } 3533 3534 /* 3535 * addrconf module should be notified of a device going up 3536 */ 3537 static struct notifier_block ipv6_dev_notf = { 3538 .notifier_call = addrconf_notify, 3539 .priority = ADDRCONF_NOTIFY_PRIORITY, 3540 }; 3541 3542 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3543 { 3544 struct inet6_dev *idev; 3545 ASSERT_RTNL(); 3546 3547 idev = __in6_dev_get(dev); 3548 3549 if (event == NETDEV_POST_TYPE_CHANGE) 3550 ipv6_mc_remap(idev); 3551 else if (event == NETDEV_PRE_TYPE_CHANGE) 3552 ipv6_mc_unmap(idev); 3553 } 3554 3555 static bool addr_is_local(const struct in6_addr *addr) 3556 { 3557 return ipv6_addr_type(addr) & 3558 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3559 } 3560 3561 static int addrconf_ifdown(struct net_device *dev, int how) 3562 { 3563 struct net *net = dev_net(dev); 3564 struct inet6_dev *idev; 3565 struct inet6_ifaddr *ifa, *tmp; 3566 struct list_head del_list; 3567 int _keep_addr; 3568 bool keep_addr; 3569 int state, i; 3570 3571 ASSERT_RTNL(); 3572 3573 rt6_ifdown(net, dev); 3574 neigh_ifdown(&nd_tbl, dev); 3575 3576 idev = __in6_dev_get(dev); 3577 if (!idev) 3578 return -ENODEV; 3579 3580 /* 3581 * Step 1: remove reference to ipv6 device from parent device. 3582 * Do not dev_put! 3583 */ 3584 if (how) { 3585 idev->dead = 1; 3586 3587 /* protected by rtnl_lock */ 3588 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3589 3590 /* Step 1.5: remove snmp6 entry */ 3591 snmp6_unregister_dev(idev); 3592 3593 } 3594 3595 /* aggregate the system setting and interface setting */ 3596 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3597 if (!_keep_addr) 3598 _keep_addr = idev->cnf.keep_addr_on_down; 3599 3600 /* combine the user config with event to determine if permanent 3601 * addresses are to be removed from address hash table 3602 */ 3603 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3604 3605 /* Step 2: clear hash table */ 3606 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3607 struct hlist_head *h = &inet6_addr_lst[i]; 3608 3609 spin_lock_bh(&addrconf_hash_lock); 3610 restart: 3611 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3612 if (ifa->idev == idev) { 3613 addrconf_del_dad_work(ifa); 3614 /* combined flag + permanent flag decide if 3615 * address is retained on a down event 3616 */ 3617 if (!keep_addr || 3618 !(ifa->flags & IFA_F_PERMANENT) || 3619 addr_is_local(&ifa->addr)) { 3620 hlist_del_init_rcu(&ifa->addr_lst); 3621 goto restart; 3622 } 3623 } 3624 } 3625 spin_unlock_bh(&addrconf_hash_lock); 3626 } 3627 3628 write_lock_bh(&idev->lock); 3629 3630 addrconf_del_rs_timer(idev); 3631 3632 /* Step 2: clear flags for stateless addrconf */ 3633 if (!how) 3634 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3635 3636 /* Step 3: clear tempaddr list */ 3637 while (!list_empty(&idev->tempaddr_list)) { 3638 ifa = list_first_entry(&idev->tempaddr_list, 3639 struct inet6_ifaddr, tmp_list); 3640 list_del(&ifa->tmp_list); 3641 write_unlock_bh(&idev->lock); 3642 spin_lock_bh(&ifa->lock); 3643 3644 if (ifa->ifpub) { 3645 in6_ifa_put(ifa->ifpub); 3646 ifa->ifpub = NULL; 3647 } 3648 spin_unlock_bh(&ifa->lock); 3649 in6_ifa_put(ifa); 3650 write_lock_bh(&idev->lock); 3651 } 3652 3653 /* re-combine the user config with event to determine if permanent 3654 * addresses are to be removed from the interface list 3655 */ 3656 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3657 3658 INIT_LIST_HEAD(&del_list); 3659 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3660 struct rt6_info *rt = NULL; 3661 bool keep; 3662 3663 addrconf_del_dad_work(ifa); 3664 3665 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3666 !addr_is_local(&ifa->addr); 3667 if (!keep) 3668 list_move(&ifa->if_list, &del_list); 3669 3670 write_unlock_bh(&idev->lock); 3671 spin_lock_bh(&ifa->lock); 3672 3673 if (keep) { 3674 /* set state to skip the notifier below */ 3675 state = INET6_IFADDR_STATE_DEAD; 3676 ifa->state = INET6_IFADDR_STATE_PREDAD; 3677 if (!(ifa->flags & IFA_F_NODAD)) 3678 ifa->flags |= IFA_F_TENTATIVE; 3679 3680 rt = ifa->rt; 3681 ifa->rt = NULL; 3682 } else { 3683 state = ifa->state; 3684 ifa->state = INET6_IFADDR_STATE_DEAD; 3685 } 3686 3687 spin_unlock_bh(&ifa->lock); 3688 3689 if (rt) 3690 ip6_del_rt(rt); 3691 3692 if (state != INET6_IFADDR_STATE_DEAD) { 3693 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3694 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3695 } else { 3696 if (idev->cnf.forwarding) 3697 addrconf_leave_anycast(ifa); 3698 addrconf_leave_solict(ifa->idev, &ifa->addr); 3699 } 3700 3701 write_lock_bh(&idev->lock); 3702 } 3703 3704 write_unlock_bh(&idev->lock); 3705 3706 /* now clean up addresses to be removed */ 3707 while (!list_empty(&del_list)) { 3708 ifa = list_first_entry(&del_list, 3709 struct inet6_ifaddr, if_list); 3710 list_del(&ifa->if_list); 3711 3712 in6_ifa_put(ifa); 3713 } 3714 3715 /* Step 5: Discard anycast and multicast list */ 3716 if (how) { 3717 ipv6_ac_destroy_dev(idev); 3718 ipv6_mc_destroy_dev(idev); 3719 } else { 3720 ipv6_mc_down(idev); 3721 } 3722 3723 idev->tstamp = jiffies; 3724 3725 /* Last: Shot the device (if unregistered) */ 3726 if (how) { 3727 addrconf_sysctl_unregister(idev); 3728 neigh_parms_release(&nd_tbl, idev->nd_parms); 3729 neigh_ifdown(&nd_tbl, dev); 3730 in6_dev_put(idev); 3731 } 3732 return 0; 3733 } 3734 3735 static void addrconf_rs_timer(unsigned long data) 3736 { 3737 struct inet6_dev *idev = (struct inet6_dev *)data; 3738 struct net_device *dev = idev->dev; 3739 struct in6_addr lladdr; 3740 3741 write_lock(&idev->lock); 3742 if (idev->dead || !(idev->if_flags & IF_READY)) 3743 goto out; 3744 3745 if (!ipv6_accept_ra(idev)) 3746 goto out; 3747 3748 /* Announcement received after solicitation was sent */ 3749 if (idev->if_flags & IF_RA_RCVD) 3750 goto out; 3751 3752 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3753 write_unlock(&idev->lock); 3754 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3755 ndisc_send_rs(dev, &lladdr, 3756 &in6addr_linklocal_allrouters); 3757 else 3758 goto put; 3759 3760 write_lock(&idev->lock); 3761 idev->rs_interval = rfc3315_s14_backoff_update( 3762 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3763 /* The wait after the last probe can be shorter */ 3764 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3765 idev->cnf.rtr_solicits) ? 3766 idev->cnf.rtr_solicit_delay : 3767 idev->rs_interval); 3768 } else { 3769 /* 3770 * Note: we do not support deprecated "all on-link" 3771 * assumption any longer. 3772 */ 3773 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3774 } 3775 3776 out: 3777 write_unlock(&idev->lock); 3778 put: 3779 in6_dev_put(idev); 3780 } 3781 3782 /* 3783 * Duplicate Address Detection 3784 */ 3785 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3786 { 3787 unsigned long rand_num; 3788 struct inet6_dev *idev = ifp->idev; 3789 u64 nonce; 3790 3791 if (ifp->flags & IFA_F_OPTIMISTIC) 3792 rand_num = 0; 3793 else 3794 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3795 3796 nonce = 0; 3797 if (idev->cnf.enhanced_dad || 3798 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3799 do 3800 get_random_bytes(&nonce, 6); 3801 while (nonce == 0); 3802 } 3803 ifp->dad_nonce = nonce; 3804 ifp->dad_probes = idev->cnf.dad_transmits; 3805 addrconf_mod_dad_work(ifp, rand_num); 3806 } 3807 3808 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3809 { 3810 struct inet6_dev *idev = ifp->idev; 3811 struct net_device *dev = idev->dev; 3812 bool bump_id, notify = false; 3813 3814 addrconf_join_solict(dev, &ifp->addr); 3815 3816 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3817 3818 read_lock_bh(&idev->lock); 3819 spin_lock(&ifp->lock); 3820 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3821 goto out; 3822 3823 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3824 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3825 idev->cnf.accept_dad < 1) || 3826 !(ifp->flags&IFA_F_TENTATIVE) || 3827 ifp->flags & IFA_F_NODAD) { 3828 bump_id = ifp->flags & IFA_F_TENTATIVE; 3829 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3830 spin_unlock(&ifp->lock); 3831 read_unlock_bh(&idev->lock); 3832 3833 addrconf_dad_completed(ifp, bump_id); 3834 return; 3835 } 3836 3837 if (!(idev->if_flags & IF_READY)) { 3838 spin_unlock(&ifp->lock); 3839 read_unlock_bh(&idev->lock); 3840 /* 3841 * If the device is not ready: 3842 * - keep it tentative if it is a permanent address. 3843 * - otherwise, kill it. 3844 */ 3845 in6_ifa_hold(ifp); 3846 addrconf_dad_stop(ifp, 0); 3847 return; 3848 } 3849 3850 /* 3851 * Optimistic nodes can start receiving 3852 * Frames right away 3853 */ 3854 if (ifp->flags & IFA_F_OPTIMISTIC) { 3855 ip6_ins_rt(ifp->rt); 3856 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3857 /* Because optimistic nodes can use this address, 3858 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3859 */ 3860 notify = true; 3861 } 3862 } 3863 3864 addrconf_dad_kick(ifp); 3865 out: 3866 spin_unlock(&ifp->lock); 3867 read_unlock_bh(&idev->lock); 3868 if (notify) 3869 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3870 } 3871 3872 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3873 { 3874 bool begin_dad = false; 3875 3876 spin_lock_bh(&ifp->lock); 3877 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3878 ifp->state = INET6_IFADDR_STATE_PREDAD; 3879 begin_dad = true; 3880 } 3881 spin_unlock_bh(&ifp->lock); 3882 3883 if (begin_dad) 3884 addrconf_mod_dad_work(ifp, 0); 3885 } 3886 3887 static void addrconf_dad_work(struct work_struct *w) 3888 { 3889 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3890 struct inet6_ifaddr, 3891 dad_work); 3892 struct inet6_dev *idev = ifp->idev; 3893 bool bump_id, disable_ipv6 = false; 3894 struct in6_addr mcaddr; 3895 3896 enum { 3897 DAD_PROCESS, 3898 DAD_BEGIN, 3899 DAD_ABORT, 3900 } action = DAD_PROCESS; 3901 3902 rtnl_lock(); 3903 3904 spin_lock_bh(&ifp->lock); 3905 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3906 action = DAD_BEGIN; 3907 ifp->state = INET6_IFADDR_STATE_DAD; 3908 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3909 action = DAD_ABORT; 3910 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3911 3912 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3913 idev->cnf.accept_dad > 1) && 3914 !idev->cnf.disable_ipv6 && 3915 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3916 struct in6_addr addr; 3917 3918 addr.s6_addr32[0] = htonl(0xfe800000); 3919 addr.s6_addr32[1] = 0; 3920 3921 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3922 ipv6_addr_equal(&ifp->addr, &addr)) { 3923 /* DAD failed for link-local based on MAC */ 3924 idev->cnf.disable_ipv6 = 1; 3925 3926 pr_info("%s: IPv6 being disabled!\n", 3927 ifp->idev->dev->name); 3928 disable_ipv6 = true; 3929 } 3930 } 3931 } 3932 spin_unlock_bh(&ifp->lock); 3933 3934 if (action == DAD_BEGIN) { 3935 addrconf_dad_begin(ifp); 3936 goto out; 3937 } else if (action == DAD_ABORT) { 3938 in6_ifa_hold(ifp); 3939 addrconf_dad_stop(ifp, 1); 3940 if (disable_ipv6) 3941 addrconf_ifdown(idev->dev, 0); 3942 goto out; 3943 } 3944 3945 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3946 goto out; 3947 3948 write_lock_bh(&idev->lock); 3949 if (idev->dead || !(idev->if_flags & IF_READY)) { 3950 write_unlock_bh(&idev->lock); 3951 goto out; 3952 } 3953 3954 spin_lock(&ifp->lock); 3955 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3956 spin_unlock(&ifp->lock); 3957 write_unlock_bh(&idev->lock); 3958 goto out; 3959 } 3960 3961 if (ifp->dad_probes == 0) { 3962 /* 3963 * DAD was successful 3964 */ 3965 3966 bump_id = ifp->flags & IFA_F_TENTATIVE; 3967 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3968 spin_unlock(&ifp->lock); 3969 write_unlock_bh(&idev->lock); 3970 3971 addrconf_dad_completed(ifp, bump_id); 3972 3973 goto out; 3974 } 3975 3976 ifp->dad_probes--; 3977 addrconf_mod_dad_work(ifp, 3978 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3979 spin_unlock(&ifp->lock); 3980 write_unlock_bh(&idev->lock); 3981 3982 /* send a neighbour solicitation for our addr */ 3983 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3984 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3985 ifp->dad_nonce); 3986 out: 3987 in6_ifa_put(ifp); 3988 rtnl_unlock(); 3989 } 3990 3991 /* ifp->idev must be at least read locked */ 3992 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3993 { 3994 struct inet6_ifaddr *ifpiter; 3995 struct inet6_dev *idev = ifp->idev; 3996 3997 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3998 if (ifpiter->scope > IFA_LINK) 3999 break; 4000 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4001 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4002 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4003 IFA_F_PERMANENT) 4004 return false; 4005 } 4006 return true; 4007 } 4008 4009 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4010 { 4011 struct net_device *dev = ifp->idev->dev; 4012 struct in6_addr lladdr; 4013 bool send_rs, send_mld; 4014 4015 addrconf_del_dad_work(ifp); 4016 4017 /* 4018 * Configure the address for reception. Now it is valid. 4019 */ 4020 4021 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4022 4023 /* If added prefix is link local and we are prepared to process 4024 router advertisements, start sending router solicitations. 4025 */ 4026 4027 read_lock_bh(&ifp->idev->lock); 4028 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4029 send_rs = send_mld && 4030 ipv6_accept_ra(ifp->idev) && 4031 ifp->idev->cnf.rtr_solicits != 0 && 4032 (dev->flags&IFF_LOOPBACK) == 0; 4033 read_unlock_bh(&ifp->idev->lock); 4034 4035 /* While dad is in progress mld report's source address is in6_addrany. 4036 * Resend with proper ll now. 4037 */ 4038 if (send_mld) 4039 ipv6_mc_dad_complete(ifp->idev); 4040 4041 if (send_rs) { 4042 /* 4043 * If a host as already performed a random delay 4044 * [...] as part of DAD [...] there is no need 4045 * to delay again before sending the first RS 4046 */ 4047 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4048 return; 4049 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4050 4051 write_lock_bh(&ifp->idev->lock); 4052 spin_lock(&ifp->lock); 4053 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4054 ifp->idev->cnf.rtr_solicit_interval); 4055 ifp->idev->rs_probes = 1; 4056 ifp->idev->if_flags |= IF_RS_SENT; 4057 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4058 spin_unlock(&ifp->lock); 4059 write_unlock_bh(&ifp->idev->lock); 4060 } 4061 4062 if (bump_id) 4063 rt_genid_bump_ipv6(dev_net(dev)); 4064 4065 /* Make sure that a new temporary address will be created 4066 * before this temporary address becomes deprecated. 4067 */ 4068 if (ifp->flags & IFA_F_TEMPORARY) 4069 addrconf_verify_rtnl(); 4070 } 4071 4072 static void addrconf_dad_run(struct inet6_dev *idev) 4073 { 4074 struct inet6_ifaddr *ifp; 4075 4076 read_lock_bh(&idev->lock); 4077 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4078 spin_lock(&ifp->lock); 4079 if (ifp->flags & IFA_F_TENTATIVE && 4080 ifp->state == INET6_IFADDR_STATE_DAD) 4081 addrconf_dad_kick(ifp); 4082 spin_unlock(&ifp->lock); 4083 } 4084 read_unlock_bh(&idev->lock); 4085 } 4086 4087 #ifdef CONFIG_PROC_FS 4088 struct if6_iter_state { 4089 struct seq_net_private p; 4090 int bucket; 4091 int offset; 4092 }; 4093 4094 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4095 { 4096 struct inet6_ifaddr *ifa = NULL; 4097 struct if6_iter_state *state = seq->private; 4098 struct net *net = seq_file_net(seq); 4099 int p = 0; 4100 4101 /* initial bucket if pos is 0 */ 4102 if (pos == 0) { 4103 state->bucket = 0; 4104 state->offset = 0; 4105 } 4106 4107 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4108 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4109 addr_lst) { 4110 if (!net_eq(dev_net(ifa->idev->dev), net)) 4111 continue; 4112 /* sync with offset */ 4113 if (p < state->offset) { 4114 p++; 4115 continue; 4116 } 4117 state->offset++; 4118 return ifa; 4119 } 4120 4121 /* prepare for next bucket */ 4122 state->offset = 0; 4123 p = 0; 4124 } 4125 return NULL; 4126 } 4127 4128 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4129 struct inet6_ifaddr *ifa) 4130 { 4131 struct if6_iter_state *state = seq->private; 4132 struct net *net = seq_file_net(seq); 4133 4134 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4135 if (!net_eq(dev_net(ifa->idev->dev), net)) 4136 continue; 4137 state->offset++; 4138 return ifa; 4139 } 4140 4141 while (++state->bucket < IN6_ADDR_HSIZE) { 4142 state->offset = 0; 4143 hlist_for_each_entry_rcu_bh(ifa, 4144 &inet6_addr_lst[state->bucket], addr_lst) { 4145 if (!net_eq(dev_net(ifa->idev->dev), net)) 4146 continue; 4147 state->offset++; 4148 return ifa; 4149 } 4150 } 4151 4152 return NULL; 4153 } 4154 4155 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4156 __acquires(rcu_bh) 4157 { 4158 rcu_read_lock_bh(); 4159 return if6_get_first(seq, *pos); 4160 } 4161 4162 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4163 { 4164 struct inet6_ifaddr *ifa; 4165 4166 ifa = if6_get_next(seq, v); 4167 ++*pos; 4168 return ifa; 4169 } 4170 4171 static void if6_seq_stop(struct seq_file *seq, void *v) 4172 __releases(rcu_bh) 4173 { 4174 rcu_read_unlock_bh(); 4175 } 4176 4177 static int if6_seq_show(struct seq_file *seq, void *v) 4178 { 4179 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4180 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4181 &ifp->addr, 4182 ifp->idev->dev->ifindex, 4183 ifp->prefix_len, 4184 ifp->scope, 4185 (u8) ifp->flags, 4186 ifp->idev->dev->name); 4187 return 0; 4188 } 4189 4190 static const struct seq_operations if6_seq_ops = { 4191 .start = if6_seq_start, 4192 .next = if6_seq_next, 4193 .show = if6_seq_show, 4194 .stop = if6_seq_stop, 4195 }; 4196 4197 static int if6_seq_open(struct inode *inode, struct file *file) 4198 { 4199 return seq_open_net(inode, file, &if6_seq_ops, 4200 sizeof(struct if6_iter_state)); 4201 } 4202 4203 static const struct file_operations if6_fops = { 4204 .owner = THIS_MODULE, 4205 .open = if6_seq_open, 4206 .read = seq_read, 4207 .llseek = seq_lseek, 4208 .release = seq_release_net, 4209 }; 4210 4211 static int __net_init if6_proc_net_init(struct net *net) 4212 { 4213 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4214 return -ENOMEM; 4215 return 0; 4216 } 4217 4218 static void __net_exit if6_proc_net_exit(struct net *net) 4219 { 4220 remove_proc_entry("if_inet6", net->proc_net); 4221 } 4222 4223 static struct pernet_operations if6_proc_net_ops = { 4224 .init = if6_proc_net_init, 4225 .exit = if6_proc_net_exit, 4226 }; 4227 4228 int __init if6_proc_init(void) 4229 { 4230 return register_pernet_subsys(&if6_proc_net_ops); 4231 } 4232 4233 void if6_proc_exit(void) 4234 { 4235 unregister_pernet_subsys(&if6_proc_net_ops); 4236 } 4237 #endif /* CONFIG_PROC_FS */ 4238 4239 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4240 /* Check if address is a home address configured on any interface. */ 4241 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4242 { 4243 int ret = 0; 4244 struct inet6_ifaddr *ifp = NULL; 4245 unsigned int hash = inet6_addr_hash(addr); 4246 4247 rcu_read_lock_bh(); 4248 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4249 if (!net_eq(dev_net(ifp->idev->dev), net)) 4250 continue; 4251 if (ipv6_addr_equal(&ifp->addr, addr) && 4252 (ifp->flags & IFA_F_HOMEADDRESS)) { 4253 ret = 1; 4254 break; 4255 } 4256 } 4257 rcu_read_unlock_bh(); 4258 return ret; 4259 } 4260 #endif 4261 4262 /* 4263 * Periodic address status verification 4264 */ 4265 4266 static void addrconf_verify_rtnl(void) 4267 { 4268 unsigned long now, next, next_sec, next_sched; 4269 struct inet6_ifaddr *ifp; 4270 int i; 4271 4272 ASSERT_RTNL(); 4273 4274 rcu_read_lock_bh(); 4275 now = jiffies; 4276 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4277 4278 cancel_delayed_work(&addr_chk_work); 4279 4280 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4281 restart: 4282 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4283 unsigned long age; 4284 4285 /* When setting preferred_lft to a value not zero or 4286 * infinity, while valid_lft is infinity 4287 * IFA_F_PERMANENT has a non-infinity life time. 4288 */ 4289 if ((ifp->flags & IFA_F_PERMANENT) && 4290 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4291 continue; 4292 4293 spin_lock(&ifp->lock); 4294 /* We try to batch several events at once. */ 4295 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4296 4297 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4298 age >= ifp->valid_lft) { 4299 spin_unlock(&ifp->lock); 4300 in6_ifa_hold(ifp); 4301 ipv6_del_addr(ifp); 4302 goto restart; 4303 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4304 spin_unlock(&ifp->lock); 4305 continue; 4306 } else if (age >= ifp->prefered_lft) { 4307 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4308 int deprecate = 0; 4309 4310 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4311 deprecate = 1; 4312 ifp->flags |= IFA_F_DEPRECATED; 4313 } 4314 4315 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4316 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4317 next = ifp->tstamp + ifp->valid_lft * HZ; 4318 4319 spin_unlock(&ifp->lock); 4320 4321 if (deprecate) { 4322 in6_ifa_hold(ifp); 4323 4324 ipv6_ifa_notify(0, ifp); 4325 in6_ifa_put(ifp); 4326 goto restart; 4327 } 4328 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4329 !(ifp->flags&IFA_F_TENTATIVE)) { 4330 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4331 ifp->idev->cnf.dad_transmits * 4332 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4333 4334 if (age >= ifp->prefered_lft - regen_advance) { 4335 struct inet6_ifaddr *ifpub = ifp->ifpub; 4336 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4337 next = ifp->tstamp + ifp->prefered_lft * HZ; 4338 if (!ifp->regen_count && ifpub) { 4339 ifp->regen_count++; 4340 in6_ifa_hold(ifp); 4341 in6_ifa_hold(ifpub); 4342 spin_unlock(&ifp->lock); 4343 4344 spin_lock(&ifpub->lock); 4345 ifpub->regen_count = 0; 4346 spin_unlock(&ifpub->lock); 4347 ipv6_create_tempaddr(ifpub, ifp); 4348 in6_ifa_put(ifpub); 4349 in6_ifa_put(ifp); 4350 goto restart; 4351 } 4352 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4353 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4354 spin_unlock(&ifp->lock); 4355 } else { 4356 /* ifp->prefered_lft <= ifp->valid_lft */ 4357 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4358 next = ifp->tstamp + ifp->prefered_lft * HZ; 4359 spin_unlock(&ifp->lock); 4360 } 4361 } 4362 } 4363 4364 next_sec = round_jiffies_up(next); 4365 next_sched = next; 4366 4367 /* If rounded timeout is accurate enough, accept it. */ 4368 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4369 next_sched = next_sec; 4370 4371 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4372 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4373 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4374 4375 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4376 now, next, next_sec, next_sched); 4377 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4378 rcu_read_unlock_bh(); 4379 } 4380 4381 static void addrconf_verify_work(struct work_struct *w) 4382 { 4383 rtnl_lock(); 4384 addrconf_verify_rtnl(); 4385 rtnl_unlock(); 4386 } 4387 4388 static void addrconf_verify(void) 4389 { 4390 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4391 } 4392 4393 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4394 struct in6_addr **peer_pfx) 4395 { 4396 struct in6_addr *pfx = NULL; 4397 4398 *peer_pfx = NULL; 4399 4400 if (addr) 4401 pfx = nla_data(addr); 4402 4403 if (local) { 4404 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4405 *peer_pfx = pfx; 4406 pfx = nla_data(local); 4407 } 4408 4409 return pfx; 4410 } 4411 4412 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4413 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4414 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4415 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4416 [IFA_FLAGS] = { .len = sizeof(u32) }, 4417 }; 4418 4419 static int 4420 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4421 struct netlink_ext_ack *extack) 4422 { 4423 struct net *net = sock_net(skb->sk); 4424 struct ifaddrmsg *ifm; 4425 struct nlattr *tb[IFA_MAX+1]; 4426 struct in6_addr *pfx, *peer_pfx; 4427 u32 ifa_flags; 4428 int err; 4429 4430 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4431 extack); 4432 if (err < 0) 4433 return err; 4434 4435 ifm = nlmsg_data(nlh); 4436 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4437 if (!pfx) 4438 return -EINVAL; 4439 4440 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4441 4442 /* We ignore other flags so far. */ 4443 ifa_flags &= IFA_F_MANAGETEMPADDR; 4444 4445 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4446 ifm->ifa_prefixlen); 4447 } 4448 4449 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4450 u32 prefered_lft, u32 valid_lft) 4451 { 4452 u32 flags; 4453 clock_t expires; 4454 unsigned long timeout; 4455 bool was_managetempaddr; 4456 bool had_prefixroute; 4457 4458 ASSERT_RTNL(); 4459 4460 if (!valid_lft || (prefered_lft > valid_lft)) 4461 return -EINVAL; 4462 4463 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4464 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4465 return -EINVAL; 4466 4467 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4468 if (addrconf_finite_timeout(timeout)) { 4469 expires = jiffies_to_clock_t(timeout * HZ); 4470 valid_lft = timeout; 4471 flags = RTF_EXPIRES; 4472 } else { 4473 expires = 0; 4474 flags = 0; 4475 ifa_flags |= IFA_F_PERMANENT; 4476 } 4477 4478 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4479 if (addrconf_finite_timeout(timeout)) { 4480 if (timeout == 0) 4481 ifa_flags |= IFA_F_DEPRECATED; 4482 prefered_lft = timeout; 4483 } 4484 4485 spin_lock_bh(&ifp->lock); 4486 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4487 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4488 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4489 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4490 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4491 IFA_F_NOPREFIXROUTE); 4492 ifp->flags |= ifa_flags; 4493 ifp->tstamp = jiffies; 4494 ifp->valid_lft = valid_lft; 4495 ifp->prefered_lft = prefered_lft; 4496 4497 spin_unlock_bh(&ifp->lock); 4498 if (!(ifp->flags&IFA_F_TENTATIVE)) 4499 ipv6_ifa_notify(0, ifp); 4500 4501 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4502 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4503 expires, flags); 4504 } else if (had_prefixroute) { 4505 enum cleanup_prefix_rt_t action; 4506 unsigned long rt_expires; 4507 4508 write_lock_bh(&ifp->idev->lock); 4509 action = check_cleanup_prefix_route(ifp, &rt_expires); 4510 write_unlock_bh(&ifp->idev->lock); 4511 4512 if (action != CLEANUP_PREFIX_RT_NOP) { 4513 cleanup_prefix_route(ifp, rt_expires, 4514 action == CLEANUP_PREFIX_RT_DEL); 4515 } 4516 } 4517 4518 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4519 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4520 valid_lft = prefered_lft = 0; 4521 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4522 !was_managetempaddr, jiffies); 4523 } 4524 4525 addrconf_verify_rtnl(); 4526 4527 return 0; 4528 } 4529 4530 static int 4531 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4532 struct netlink_ext_ack *extack) 4533 { 4534 struct net *net = sock_net(skb->sk); 4535 struct ifaddrmsg *ifm; 4536 struct nlattr *tb[IFA_MAX+1]; 4537 struct in6_addr *pfx, *peer_pfx; 4538 struct inet6_ifaddr *ifa; 4539 struct net_device *dev; 4540 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4541 u32 ifa_flags; 4542 int err; 4543 4544 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4545 extack); 4546 if (err < 0) 4547 return err; 4548 4549 ifm = nlmsg_data(nlh); 4550 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4551 if (!pfx) 4552 return -EINVAL; 4553 4554 if (tb[IFA_CACHEINFO]) { 4555 struct ifa_cacheinfo *ci; 4556 4557 ci = nla_data(tb[IFA_CACHEINFO]); 4558 valid_lft = ci->ifa_valid; 4559 preferred_lft = ci->ifa_prefered; 4560 } else { 4561 preferred_lft = INFINITY_LIFE_TIME; 4562 valid_lft = INFINITY_LIFE_TIME; 4563 } 4564 4565 dev = __dev_get_by_index(net, ifm->ifa_index); 4566 if (!dev) 4567 return -ENODEV; 4568 4569 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4570 4571 /* We ignore other flags so far. */ 4572 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4573 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4574 4575 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4576 if (!ifa) { 4577 /* 4578 * It would be best to check for !NLM_F_CREATE here but 4579 * userspace already relies on not having to provide this. 4580 */ 4581 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4582 ifm->ifa_prefixlen, ifa_flags, 4583 preferred_lft, valid_lft); 4584 } 4585 4586 if (nlh->nlmsg_flags & NLM_F_EXCL || 4587 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4588 err = -EEXIST; 4589 else 4590 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4591 4592 in6_ifa_put(ifa); 4593 4594 return err; 4595 } 4596 4597 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4598 u8 scope, int ifindex) 4599 { 4600 struct ifaddrmsg *ifm; 4601 4602 ifm = nlmsg_data(nlh); 4603 ifm->ifa_family = AF_INET6; 4604 ifm->ifa_prefixlen = prefixlen; 4605 ifm->ifa_flags = flags; 4606 ifm->ifa_scope = scope; 4607 ifm->ifa_index = ifindex; 4608 } 4609 4610 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4611 unsigned long tstamp, u32 preferred, u32 valid) 4612 { 4613 struct ifa_cacheinfo ci; 4614 4615 ci.cstamp = cstamp_delta(cstamp); 4616 ci.tstamp = cstamp_delta(tstamp); 4617 ci.ifa_prefered = preferred; 4618 ci.ifa_valid = valid; 4619 4620 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4621 } 4622 4623 static inline int rt_scope(int ifa_scope) 4624 { 4625 if (ifa_scope & IFA_HOST) 4626 return RT_SCOPE_HOST; 4627 else if (ifa_scope & IFA_LINK) 4628 return RT_SCOPE_LINK; 4629 else if (ifa_scope & IFA_SITE) 4630 return RT_SCOPE_SITE; 4631 else 4632 return RT_SCOPE_UNIVERSE; 4633 } 4634 4635 static inline int inet6_ifaddr_msgsize(void) 4636 { 4637 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4638 + nla_total_size(16) /* IFA_LOCAL */ 4639 + nla_total_size(16) /* IFA_ADDRESS */ 4640 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4641 + nla_total_size(4) /* IFA_FLAGS */; 4642 } 4643 4644 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4645 u32 portid, u32 seq, int event, unsigned int flags) 4646 { 4647 struct nlmsghdr *nlh; 4648 u32 preferred, valid; 4649 4650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4651 if (!nlh) 4652 return -EMSGSIZE; 4653 4654 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4655 ifa->idev->dev->ifindex); 4656 4657 if (!((ifa->flags&IFA_F_PERMANENT) && 4658 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4659 preferred = ifa->prefered_lft; 4660 valid = ifa->valid_lft; 4661 if (preferred != INFINITY_LIFE_TIME) { 4662 long tval = (jiffies - ifa->tstamp)/HZ; 4663 if (preferred > tval) 4664 preferred -= tval; 4665 else 4666 preferred = 0; 4667 if (valid != INFINITY_LIFE_TIME) { 4668 if (valid > tval) 4669 valid -= tval; 4670 else 4671 valid = 0; 4672 } 4673 } 4674 } else { 4675 preferred = INFINITY_LIFE_TIME; 4676 valid = INFINITY_LIFE_TIME; 4677 } 4678 4679 if (!ipv6_addr_any(&ifa->peer_addr)) { 4680 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4681 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4682 goto error; 4683 } else 4684 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4685 goto error; 4686 4687 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4688 goto error; 4689 4690 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4691 goto error; 4692 4693 nlmsg_end(skb, nlh); 4694 return 0; 4695 4696 error: 4697 nlmsg_cancel(skb, nlh); 4698 return -EMSGSIZE; 4699 } 4700 4701 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4702 u32 portid, u32 seq, int event, u16 flags) 4703 { 4704 struct nlmsghdr *nlh; 4705 u8 scope = RT_SCOPE_UNIVERSE; 4706 int ifindex = ifmca->idev->dev->ifindex; 4707 4708 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4709 scope = RT_SCOPE_SITE; 4710 4711 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4712 if (!nlh) 4713 return -EMSGSIZE; 4714 4715 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4716 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4717 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4718 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4719 nlmsg_cancel(skb, nlh); 4720 return -EMSGSIZE; 4721 } 4722 4723 nlmsg_end(skb, nlh); 4724 return 0; 4725 } 4726 4727 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4728 u32 portid, u32 seq, int event, unsigned int flags) 4729 { 4730 struct nlmsghdr *nlh; 4731 u8 scope = RT_SCOPE_UNIVERSE; 4732 int ifindex = ifaca->aca_idev->dev->ifindex; 4733 4734 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4735 scope = RT_SCOPE_SITE; 4736 4737 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4738 if (!nlh) 4739 return -EMSGSIZE; 4740 4741 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4742 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4743 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4744 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4745 nlmsg_cancel(skb, nlh); 4746 return -EMSGSIZE; 4747 } 4748 4749 nlmsg_end(skb, nlh); 4750 return 0; 4751 } 4752 4753 enum addr_type_t { 4754 UNICAST_ADDR, 4755 MULTICAST_ADDR, 4756 ANYCAST_ADDR, 4757 }; 4758 4759 /* called with rcu_read_lock() */ 4760 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4761 struct netlink_callback *cb, enum addr_type_t type, 4762 int s_ip_idx, int *p_ip_idx) 4763 { 4764 struct ifmcaddr6 *ifmca; 4765 struct ifacaddr6 *ifaca; 4766 int err = 1; 4767 int ip_idx = *p_ip_idx; 4768 4769 read_lock_bh(&idev->lock); 4770 switch (type) { 4771 case UNICAST_ADDR: { 4772 struct inet6_ifaddr *ifa; 4773 4774 /* unicast address incl. temp addr */ 4775 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4776 if (++ip_idx < s_ip_idx) 4777 continue; 4778 err = inet6_fill_ifaddr(skb, ifa, 4779 NETLINK_CB(cb->skb).portid, 4780 cb->nlh->nlmsg_seq, 4781 RTM_NEWADDR, 4782 NLM_F_MULTI); 4783 if (err < 0) 4784 break; 4785 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4786 } 4787 break; 4788 } 4789 case MULTICAST_ADDR: 4790 /* multicast address */ 4791 for (ifmca = idev->mc_list; ifmca; 4792 ifmca = ifmca->next, ip_idx++) { 4793 if (ip_idx < s_ip_idx) 4794 continue; 4795 err = inet6_fill_ifmcaddr(skb, ifmca, 4796 NETLINK_CB(cb->skb).portid, 4797 cb->nlh->nlmsg_seq, 4798 RTM_GETMULTICAST, 4799 NLM_F_MULTI); 4800 if (err < 0) 4801 break; 4802 } 4803 break; 4804 case ANYCAST_ADDR: 4805 /* anycast address */ 4806 for (ifaca = idev->ac_list; ifaca; 4807 ifaca = ifaca->aca_next, ip_idx++) { 4808 if (ip_idx < s_ip_idx) 4809 continue; 4810 err = inet6_fill_ifacaddr(skb, ifaca, 4811 NETLINK_CB(cb->skb).portid, 4812 cb->nlh->nlmsg_seq, 4813 RTM_GETANYCAST, 4814 NLM_F_MULTI); 4815 if (err < 0) 4816 break; 4817 } 4818 break; 4819 default: 4820 break; 4821 } 4822 read_unlock_bh(&idev->lock); 4823 *p_ip_idx = ip_idx; 4824 return err; 4825 } 4826 4827 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4828 enum addr_type_t type) 4829 { 4830 struct net *net = sock_net(skb->sk); 4831 int h, s_h; 4832 int idx, ip_idx; 4833 int s_idx, s_ip_idx; 4834 struct net_device *dev; 4835 struct inet6_dev *idev; 4836 struct hlist_head *head; 4837 4838 s_h = cb->args[0]; 4839 s_idx = idx = cb->args[1]; 4840 s_ip_idx = ip_idx = cb->args[2]; 4841 4842 rcu_read_lock(); 4843 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4844 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4845 idx = 0; 4846 head = &net->dev_index_head[h]; 4847 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4848 if (idx < s_idx) 4849 goto cont; 4850 if (h > s_h || idx > s_idx) 4851 s_ip_idx = 0; 4852 ip_idx = 0; 4853 idev = __in6_dev_get(dev); 4854 if (!idev) 4855 goto cont; 4856 4857 if (in6_dump_addrs(idev, skb, cb, type, 4858 s_ip_idx, &ip_idx) < 0) 4859 goto done; 4860 cont: 4861 idx++; 4862 } 4863 } 4864 done: 4865 rcu_read_unlock(); 4866 cb->args[0] = h; 4867 cb->args[1] = idx; 4868 cb->args[2] = ip_idx; 4869 4870 return skb->len; 4871 } 4872 4873 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4874 { 4875 enum addr_type_t type = UNICAST_ADDR; 4876 4877 return inet6_dump_addr(skb, cb, type); 4878 } 4879 4880 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4881 { 4882 enum addr_type_t type = MULTICAST_ADDR; 4883 4884 return inet6_dump_addr(skb, cb, type); 4885 } 4886 4887 4888 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4889 { 4890 enum addr_type_t type = ANYCAST_ADDR; 4891 4892 return inet6_dump_addr(skb, cb, type); 4893 } 4894 4895 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4896 struct netlink_ext_ack *extack) 4897 { 4898 struct net *net = sock_net(in_skb->sk); 4899 struct ifaddrmsg *ifm; 4900 struct nlattr *tb[IFA_MAX+1]; 4901 struct in6_addr *addr = NULL, *peer; 4902 struct net_device *dev = NULL; 4903 struct inet6_ifaddr *ifa; 4904 struct sk_buff *skb; 4905 int err; 4906 4907 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4908 extack); 4909 if (err < 0) 4910 goto errout; 4911 4912 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4913 if (!addr) { 4914 err = -EINVAL; 4915 goto errout; 4916 } 4917 4918 ifm = nlmsg_data(nlh); 4919 if (ifm->ifa_index) 4920 dev = __dev_get_by_index(net, ifm->ifa_index); 4921 4922 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4923 if (!ifa) { 4924 err = -EADDRNOTAVAIL; 4925 goto errout; 4926 } 4927 4928 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4929 if (!skb) { 4930 err = -ENOBUFS; 4931 goto errout_ifa; 4932 } 4933 4934 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4935 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4936 if (err < 0) { 4937 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4938 WARN_ON(err == -EMSGSIZE); 4939 kfree_skb(skb); 4940 goto errout_ifa; 4941 } 4942 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4943 errout_ifa: 4944 in6_ifa_put(ifa); 4945 errout: 4946 return err; 4947 } 4948 4949 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4950 { 4951 struct sk_buff *skb; 4952 struct net *net = dev_net(ifa->idev->dev); 4953 int err = -ENOBUFS; 4954 4955 /* Don't send DELADDR notification for TENTATIVE address, 4956 * since NEWADDR notification is sent only after removing 4957 * TENTATIVE flag, if DAD has not failed. 4958 */ 4959 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4960 event == RTM_DELADDR) 4961 return; 4962 4963 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4964 if (!skb) 4965 goto errout; 4966 4967 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4968 if (err < 0) { 4969 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4970 WARN_ON(err == -EMSGSIZE); 4971 kfree_skb(skb); 4972 goto errout; 4973 } 4974 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4975 return; 4976 errout: 4977 if (err < 0) 4978 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4979 } 4980 4981 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4982 __s32 *array, int bytes) 4983 { 4984 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4985 4986 memset(array, 0, bytes); 4987 array[DEVCONF_FORWARDING] = cnf->forwarding; 4988 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4989 array[DEVCONF_MTU6] = cnf->mtu6; 4990 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4991 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4992 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4993 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4994 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4995 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4996 jiffies_to_msecs(cnf->rtr_solicit_interval); 4997 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4998 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4999 array[DEVCONF_RTR_SOLICIT_DELAY] = 5000 jiffies_to_msecs(cnf->rtr_solicit_delay); 5001 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5002 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5003 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5004 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5005 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5006 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5007 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5008 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5009 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5010 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5011 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5012 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5013 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5014 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5015 #ifdef CONFIG_IPV6_ROUTER_PREF 5016 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5017 array[DEVCONF_RTR_PROBE_INTERVAL] = 5018 jiffies_to_msecs(cnf->rtr_probe_interval); 5019 #ifdef CONFIG_IPV6_ROUTE_INFO 5020 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5021 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5022 #endif 5023 #endif 5024 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5025 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5026 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5027 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5028 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5029 #endif 5030 #ifdef CONFIG_IPV6_MROUTE 5031 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5032 #endif 5033 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5034 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5035 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5036 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5037 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5038 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5039 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5040 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5041 /* we omit DEVCONF_STABLE_SECRET for now */ 5042 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5043 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5044 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5045 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5046 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5047 #ifdef CONFIG_IPV6_SEG6_HMAC 5048 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5049 #endif 5050 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5051 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5052 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5053 } 5054 5055 static inline size_t inet6_ifla6_size(void) 5056 { 5057 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5058 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5059 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5060 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5061 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5062 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5063 } 5064 5065 static inline size_t inet6_if_nlmsg_size(void) 5066 { 5067 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5068 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5069 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5070 + nla_total_size(4) /* IFLA_MTU */ 5071 + nla_total_size(4) /* IFLA_LINK */ 5072 + nla_total_size(1) /* IFLA_OPERSTATE */ 5073 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5074 } 5075 5076 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5077 int bytes) 5078 { 5079 int i; 5080 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5081 BUG_ON(pad < 0); 5082 5083 /* Use put_unaligned() because stats may not be aligned for u64. */ 5084 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5085 for (i = 1; i < ICMP6_MIB_MAX; i++) 5086 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5087 5088 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5089 } 5090 5091 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5092 int bytes, size_t syncpoff) 5093 { 5094 int i, c; 5095 u64 buff[IPSTATS_MIB_MAX]; 5096 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5097 5098 BUG_ON(pad < 0); 5099 5100 memset(buff, 0, sizeof(buff)); 5101 buff[0] = IPSTATS_MIB_MAX; 5102 5103 for_each_possible_cpu(c) { 5104 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5105 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5106 } 5107 5108 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5109 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5110 } 5111 5112 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5113 int bytes) 5114 { 5115 switch (attrtype) { 5116 case IFLA_INET6_STATS: 5117 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5118 offsetof(struct ipstats_mib, syncp)); 5119 break; 5120 case IFLA_INET6_ICMP6STATS: 5121 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5122 break; 5123 } 5124 } 5125 5126 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5127 u32 ext_filter_mask) 5128 { 5129 struct nlattr *nla; 5130 struct ifla_cacheinfo ci; 5131 5132 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5133 goto nla_put_failure; 5134 ci.max_reasm_len = IPV6_MAXPLEN; 5135 ci.tstamp = cstamp_delta(idev->tstamp); 5136 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5137 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5138 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5139 goto nla_put_failure; 5140 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5141 if (!nla) 5142 goto nla_put_failure; 5143 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5144 5145 /* XXX - MC not implemented */ 5146 5147 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5148 return 0; 5149 5150 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5151 if (!nla) 5152 goto nla_put_failure; 5153 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5154 5155 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5156 if (!nla) 5157 goto nla_put_failure; 5158 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5159 5160 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5161 if (!nla) 5162 goto nla_put_failure; 5163 5164 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5165 goto nla_put_failure; 5166 5167 read_lock_bh(&idev->lock); 5168 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5169 read_unlock_bh(&idev->lock); 5170 5171 return 0; 5172 5173 nla_put_failure: 5174 return -EMSGSIZE; 5175 } 5176 5177 static size_t inet6_get_link_af_size(const struct net_device *dev, 5178 u32 ext_filter_mask) 5179 { 5180 if (!__in6_dev_get(dev)) 5181 return 0; 5182 5183 return inet6_ifla6_size(); 5184 } 5185 5186 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5187 u32 ext_filter_mask) 5188 { 5189 struct inet6_dev *idev = __in6_dev_get(dev); 5190 5191 if (!idev) 5192 return -ENODATA; 5193 5194 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5195 return -EMSGSIZE; 5196 5197 return 0; 5198 } 5199 5200 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5201 { 5202 struct inet6_ifaddr *ifp; 5203 struct net_device *dev = idev->dev; 5204 bool clear_token, update_rs = false; 5205 struct in6_addr ll_addr; 5206 5207 ASSERT_RTNL(); 5208 5209 if (!token) 5210 return -EINVAL; 5211 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5212 return -EINVAL; 5213 if (!ipv6_accept_ra(idev)) 5214 return -EINVAL; 5215 if (idev->cnf.rtr_solicits == 0) 5216 return -EINVAL; 5217 5218 write_lock_bh(&idev->lock); 5219 5220 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5221 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5222 5223 write_unlock_bh(&idev->lock); 5224 5225 clear_token = ipv6_addr_any(token); 5226 if (clear_token) 5227 goto update_lft; 5228 5229 if (!idev->dead && (idev->if_flags & IF_READY) && 5230 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5231 IFA_F_OPTIMISTIC)) { 5232 /* If we're not ready, then normal ifup will take care 5233 * of this. Otherwise, we need to request our rs here. 5234 */ 5235 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5236 update_rs = true; 5237 } 5238 5239 update_lft: 5240 write_lock_bh(&idev->lock); 5241 5242 if (update_rs) { 5243 idev->if_flags |= IF_RS_SENT; 5244 idev->rs_interval = rfc3315_s14_backoff_init( 5245 idev->cnf.rtr_solicit_interval); 5246 idev->rs_probes = 1; 5247 addrconf_mod_rs_timer(idev, idev->rs_interval); 5248 } 5249 5250 /* Well, that's kinda nasty ... */ 5251 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5252 spin_lock(&ifp->lock); 5253 if (ifp->tokenized) { 5254 ifp->valid_lft = 0; 5255 ifp->prefered_lft = 0; 5256 } 5257 spin_unlock(&ifp->lock); 5258 } 5259 5260 write_unlock_bh(&idev->lock); 5261 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5262 addrconf_verify_rtnl(); 5263 return 0; 5264 } 5265 5266 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5267 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5268 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5269 }; 5270 5271 static int inet6_validate_link_af(const struct net_device *dev, 5272 const struct nlattr *nla) 5273 { 5274 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5275 5276 if (dev && !__in6_dev_get(dev)) 5277 return -EAFNOSUPPORT; 5278 5279 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5280 NULL); 5281 } 5282 5283 static int check_addr_gen_mode(int mode) 5284 { 5285 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5286 mode != IN6_ADDR_GEN_MODE_NONE && 5287 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5288 mode != IN6_ADDR_GEN_MODE_RANDOM) 5289 return -EINVAL; 5290 return 1; 5291 } 5292 5293 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5294 int mode) 5295 { 5296 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5297 !idev->cnf.stable_secret.initialized && 5298 !net->ipv6.devconf_dflt->stable_secret.initialized) 5299 return -EINVAL; 5300 return 1; 5301 } 5302 5303 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5304 { 5305 int err = -EINVAL; 5306 struct inet6_dev *idev = __in6_dev_get(dev); 5307 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5308 5309 if (!idev) 5310 return -EAFNOSUPPORT; 5311 5312 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5313 BUG(); 5314 5315 if (tb[IFLA_INET6_TOKEN]) { 5316 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5317 if (err) 5318 return err; 5319 } 5320 5321 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5322 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5323 5324 if (check_addr_gen_mode(mode) < 0 || 5325 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5326 return -EINVAL; 5327 5328 idev->cnf.addr_gen_mode = mode; 5329 err = 0; 5330 } 5331 5332 return err; 5333 } 5334 5335 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5336 u32 portid, u32 seq, int event, unsigned int flags) 5337 { 5338 struct net_device *dev = idev->dev; 5339 struct ifinfomsg *hdr; 5340 struct nlmsghdr *nlh; 5341 void *protoinfo; 5342 5343 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5344 if (!nlh) 5345 return -EMSGSIZE; 5346 5347 hdr = nlmsg_data(nlh); 5348 hdr->ifi_family = AF_INET6; 5349 hdr->__ifi_pad = 0; 5350 hdr->ifi_type = dev->type; 5351 hdr->ifi_index = dev->ifindex; 5352 hdr->ifi_flags = dev_get_flags(dev); 5353 hdr->ifi_change = 0; 5354 5355 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5356 (dev->addr_len && 5357 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5358 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5359 (dev->ifindex != dev_get_iflink(dev) && 5360 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5361 nla_put_u8(skb, IFLA_OPERSTATE, 5362 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5363 goto nla_put_failure; 5364 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5365 if (!protoinfo) 5366 goto nla_put_failure; 5367 5368 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5369 goto nla_put_failure; 5370 5371 nla_nest_end(skb, protoinfo); 5372 nlmsg_end(skb, nlh); 5373 return 0; 5374 5375 nla_put_failure: 5376 nlmsg_cancel(skb, nlh); 5377 return -EMSGSIZE; 5378 } 5379 5380 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5381 { 5382 struct net *net = sock_net(skb->sk); 5383 int h, s_h; 5384 int idx = 0, s_idx; 5385 struct net_device *dev; 5386 struct inet6_dev *idev; 5387 struct hlist_head *head; 5388 5389 s_h = cb->args[0]; 5390 s_idx = cb->args[1]; 5391 5392 rcu_read_lock(); 5393 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5394 idx = 0; 5395 head = &net->dev_index_head[h]; 5396 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5397 if (idx < s_idx) 5398 goto cont; 5399 idev = __in6_dev_get(dev); 5400 if (!idev) 5401 goto cont; 5402 if (inet6_fill_ifinfo(skb, idev, 5403 NETLINK_CB(cb->skb).portid, 5404 cb->nlh->nlmsg_seq, 5405 RTM_NEWLINK, NLM_F_MULTI) < 0) 5406 goto out; 5407 cont: 5408 idx++; 5409 } 5410 } 5411 out: 5412 rcu_read_unlock(); 5413 cb->args[1] = idx; 5414 cb->args[0] = h; 5415 5416 return skb->len; 5417 } 5418 5419 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5420 { 5421 struct sk_buff *skb; 5422 struct net *net = dev_net(idev->dev); 5423 int err = -ENOBUFS; 5424 5425 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5426 if (!skb) 5427 goto errout; 5428 5429 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5430 if (err < 0) { 5431 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5432 WARN_ON(err == -EMSGSIZE); 5433 kfree_skb(skb); 5434 goto errout; 5435 } 5436 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5437 return; 5438 errout: 5439 if (err < 0) 5440 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5441 } 5442 5443 static inline size_t inet6_prefix_nlmsg_size(void) 5444 { 5445 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5446 + nla_total_size(sizeof(struct in6_addr)) 5447 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5448 } 5449 5450 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5451 struct prefix_info *pinfo, u32 portid, u32 seq, 5452 int event, unsigned int flags) 5453 { 5454 struct prefixmsg *pmsg; 5455 struct nlmsghdr *nlh; 5456 struct prefix_cacheinfo ci; 5457 5458 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5459 if (!nlh) 5460 return -EMSGSIZE; 5461 5462 pmsg = nlmsg_data(nlh); 5463 pmsg->prefix_family = AF_INET6; 5464 pmsg->prefix_pad1 = 0; 5465 pmsg->prefix_pad2 = 0; 5466 pmsg->prefix_ifindex = idev->dev->ifindex; 5467 pmsg->prefix_len = pinfo->prefix_len; 5468 pmsg->prefix_type = pinfo->type; 5469 pmsg->prefix_pad3 = 0; 5470 pmsg->prefix_flags = 0; 5471 if (pinfo->onlink) 5472 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5473 if (pinfo->autoconf) 5474 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5475 5476 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5477 goto nla_put_failure; 5478 ci.preferred_time = ntohl(pinfo->prefered); 5479 ci.valid_time = ntohl(pinfo->valid); 5480 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5481 goto nla_put_failure; 5482 nlmsg_end(skb, nlh); 5483 return 0; 5484 5485 nla_put_failure: 5486 nlmsg_cancel(skb, nlh); 5487 return -EMSGSIZE; 5488 } 5489 5490 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5491 struct prefix_info *pinfo) 5492 { 5493 struct sk_buff *skb; 5494 struct net *net = dev_net(idev->dev); 5495 int err = -ENOBUFS; 5496 5497 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5498 if (!skb) 5499 goto errout; 5500 5501 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5502 if (err < 0) { 5503 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5504 WARN_ON(err == -EMSGSIZE); 5505 kfree_skb(skb); 5506 goto errout; 5507 } 5508 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5509 return; 5510 errout: 5511 if (err < 0) 5512 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5513 } 5514 5515 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5516 { 5517 struct net *net = dev_net(ifp->idev->dev); 5518 5519 if (event) 5520 ASSERT_RTNL(); 5521 5522 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5523 5524 switch (event) { 5525 case RTM_NEWADDR: 5526 /* 5527 * If the address was optimistic 5528 * we inserted the route at the start of 5529 * our DAD process, so we don't need 5530 * to do it again 5531 */ 5532 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5533 ip6_ins_rt(ifp->rt); 5534 if (ifp->idev->cnf.forwarding) 5535 addrconf_join_anycast(ifp); 5536 if (!ipv6_addr_any(&ifp->peer_addr)) 5537 addrconf_prefix_route(&ifp->peer_addr, 128, 5538 ifp->idev->dev, 0, 0); 5539 break; 5540 case RTM_DELADDR: 5541 if (ifp->idev->cnf.forwarding) 5542 addrconf_leave_anycast(ifp); 5543 addrconf_leave_solict(ifp->idev, &ifp->addr); 5544 if (!ipv6_addr_any(&ifp->peer_addr)) { 5545 struct rt6_info *rt; 5546 5547 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5548 ifp->idev->dev, 0, 0); 5549 if (rt) 5550 ip6_del_rt(rt); 5551 } 5552 if (ifp->rt) { 5553 if (dst_hold_safe(&ifp->rt->dst)) 5554 ip6_del_rt(ifp->rt); 5555 } 5556 rt_genid_bump_ipv6(net); 5557 break; 5558 } 5559 atomic_inc(&net->ipv6.dev_addr_genid); 5560 } 5561 5562 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5563 { 5564 rcu_read_lock_bh(); 5565 if (likely(ifp->idev->dead == 0)) 5566 __ipv6_ifa_notify(event, ifp); 5567 rcu_read_unlock_bh(); 5568 } 5569 5570 #ifdef CONFIG_SYSCTL 5571 5572 static 5573 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5574 void __user *buffer, size_t *lenp, loff_t *ppos) 5575 { 5576 int *valp = ctl->data; 5577 int val = *valp; 5578 loff_t pos = *ppos; 5579 struct ctl_table lctl; 5580 int ret; 5581 5582 /* 5583 * ctl->data points to idev->cnf.forwarding, we should 5584 * not modify it until we get the rtnl lock. 5585 */ 5586 lctl = *ctl; 5587 lctl.data = &val; 5588 5589 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5590 5591 if (write) 5592 ret = addrconf_fixup_forwarding(ctl, valp, val); 5593 if (ret) 5594 *ppos = pos; 5595 return ret; 5596 } 5597 5598 static 5599 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5600 void __user *buffer, size_t *lenp, loff_t *ppos) 5601 { 5602 struct inet6_dev *idev = ctl->extra1; 5603 int min_mtu = IPV6_MIN_MTU; 5604 struct ctl_table lctl; 5605 5606 lctl = *ctl; 5607 lctl.extra1 = &min_mtu; 5608 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5609 5610 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5611 } 5612 5613 static void dev_disable_change(struct inet6_dev *idev) 5614 { 5615 struct netdev_notifier_info info; 5616 5617 if (!idev || !idev->dev) 5618 return; 5619 5620 netdev_notifier_info_init(&info, idev->dev); 5621 if (idev->cnf.disable_ipv6) 5622 addrconf_notify(NULL, NETDEV_DOWN, &info); 5623 else 5624 addrconf_notify(NULL, NETDEV_UP, &info); 5625 } 5626 5627 static void addrconf_disable_change(struct net *net, __s32 newf) 5628 { 5629 struct net_device *dev; 5630 struct inet6_dev *idev; 5631 5632 for_each_netdev(net, dev) { 5633 idev = __in6_dev_get(dev); 5634 if (idev) { 5635 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5636 idev->cnf.disable_ipv6 = newf; 5637 if (changed) 5638 dev_disable_change(idev); 5639 } 5640 } 5641 } 5642 5643 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5644 { 5645 struct net *net; 5646 int old; 5647 5648 if (!rtnl_trylock()) 5649 return restart_syscall(); 5650 5651 net = (struct net *)table->extra2; 5652 old = *p; 5653 *p = newf; 5654 5655 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5656 rtnl_unlock(); 5657 return 0; 5658 } 5659 5660 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5661 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5662 addrconf_disable_change(net, newf); 5663 } else if ((!newf) ^ (!old)) 5664 dev_disable_change((struct inet6_dev *)table->extra1); 5665 5666 rtnl_unlock(); 5667 return 0; 5668 } 5669 5670 static 5671 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5672 void __user *buffer, size_t *lenp, loff_t *ppos) 5673 { 5674 int *valp = ctl->data; 5675 int val = *valp; 5676 loff_t pos = *ppos; 5677 struct ctl_table lctl; 5678 int ret; 5679 5680 /* 5681 * ctl->data points to idev->cnf.disable_ipv6, we should 5682 * not modify it until we get the rtnl lock. 5683 */ 5684 lctl = *ctl; 5685 lctl.data = &val; 5686 5687 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5688 5689 if (write) 5690 ret = addrconf_disable_ipv6(ctl, valp, val); 5691 if (ret) 5692 *ppos = pos; 5693 return ret; 5694 } 5695 5696 static 5697 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5698 void __user *buffer, size_t *lenp, loff_t *ppos) 5699 { 5700 int *valp = ctl->data; 5701 int ret; 5702 int old, new; 5703 5704 old = *valp; 5705 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5706 new = *valp; 5707 5708 if (write && old != new) { 5709 struct net *net = ctl->extra2; 5710 5711 if (!rtnl_trylock()) 5712 return restart_syscall(); 5713 5714 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5715 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5716 NETCONFA_PROXY_NEIGH, 5717 NETCONFA_IFINDEX_DEFAULT, 5718 net->ipv6.devconf_dflt); 5719 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5720 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5721 NETCONFA_PROXY_NEIGH, 5722 NETCONFA_IFINDEX_ALL, 5723 net->ipv6.devconf_all); 5724 else { 5725 struct inet6_dev *idev = ctl->extra1; 5726 5727 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5728 NETCONFA_PROXY_NEIGH, 5729 idev->dev->ifindex, 5730 &idev->cnf); 5731 } 5732 rtnl_unlock(); 5733 } 5734 5735 return ret; 5736 } 5737 5738 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5739 void __user *buffer, size_t *lenp, 5740 loff_t *ppos) 5741 { 5742 int ret = 0; 5743 int new_val; 5744 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5745 struct net *net = (struct net *)ctl->extra2; 5746 5747 if (!rtnl_trylock()) 5748 return restart_syscall(); 5749 5750 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5751 5752 if (write) { 5753 new_val = *((int *)ctl->data); 5754 5755 if (check_addr_gen_mode(new_val) < 0) { 5756 ret = -EINVAL; 5757 goto out; 5758 } 5759 5760 /* request for default */ 5761 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5762 ipv6_devconf_dflt.addr_gen_mode = new_val; 5763 5764 /* request for individual net device */ 5765 } else { 5766 if (!idev) 5767 goto out; 5768 5769 if (check_stable_privacy(idev, net, new_val) < 0) { 5770 ret = -EINVAL; 5771 goto out; 5772 } 5773 5774 if (idev->cnf.addr_gen_mode != new_val) { 5775 idev->cnf.addr_gen_mode = new_val; 5776 addrconf_dev_config(idev->dev); 5777 } 5778 } 5779 } 5780 5781 out: 5782 rtnl_unlock(); 5783 5784 return ret; 5785 } 5786 5787 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5788 void __user *buffer, size_t *lenp, 5789 loff_t *ppos) 5790 { 5791 int err; 5792 struct in6_addr addr; 5793 char str[IPV6_MAX_STRLEN]; 5794 struct ctl_table lctl = *ctl; 5795 struct net *net = ctl->extra2; 5796 struct ipv6_stable_secret *secret = ctl->data; 5797 5798 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5799 return -EIO; 5800 5801 lctl.maxlen = IPV6_MAX_STRLEN; 5802 lctl.data = str; 5803 5804 if (!rtnl_trylock()) 5805 return restart_syscall(); 5806 5807 if (!write && !secret->initialized) { 5808 err = -EIO; 5809 goto out; 5810 } 5811 5812 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5813 if (err >= sizeof(str)) { 5814 err = -EIO; 5815 goto out; 5816 } 5817 5818 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5819 if (err || !write) 5820 goto out; 5821 5822 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5823 err = -EIO; 5824 goto out; 5825 } 5826 5827 secret->initialized = true; 5828 secret->secret = addr; 5829 5830 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5831 struct net_device *dev; 5832 5833 for_each_netdev(net, dev) { 5834 struct inet6_dev *idev = __in6_dev_get(dev); 5835 5836 if (idev) { 5837 idev->cnf.addr_gen_mode = 5838 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5839 } 5840 } 5841 } else { 5842 struct inet6_dev *idev = ctl->extra1; 5843 5844 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5845 } 5846 5847 out: 5848 rtnl_unlock(); 5849 5850 return err; 5851 } 5852 5853 static 5854 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5855 int write, 5856 void __user *buffer, 5857 size_t *lenp, 5858 loff_t *ppos) 5859 { 5860 int *valp = ctl->data; 5861 int val = *valp; 5862 loff_t pos = *ppos; 5863 struct ctl_table lctl; 5864 int ret; 5865 5866 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5867 * we should not modify it until we get the rtnl lock. 5868 */ 5869 lctl = *ctl; 5870 lctl.data = &val; 5871 5872 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5873 5874 if (write) 5875 ret = addrconf_fixup_linkdown(ctl, valp, val); 5876 if (ret) 5877 *ppos = pos; 5878 return ret; 5879 } 5880 5881 static 5882 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5883 { 5884 if (rt) { 5885 if (action) 5886 rt->dst.flags |= DST_NOPOLICY; 5887 else 5888 rt->dst.flags &= ~DST_NOPOLICY; 5889 } 5890 } 5891 5892 static 5893 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5894 { 5895 struct inet6_ifaddr *ifa; 5896 5897 read_lock_bh(&idev->lock); 5898 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5899 spin_lock(&ifa->lock); 5900 if (ifa->rt) { 5901 struct rt6_info *rt = ifa->rt; 5902 struct fib6_table *table = rt->rt6i_table; 5903 int cpu; 5904 5905 read_lock(&table->tb6_lock); 5906 addrconf_set_nopolicy(ifa->rt, val); 5907 if (rt->rt6i_pcpu) { 5908 for_each_possible_cpu(cpu) { 5909 struct rt6_info **rtp; 5910 5911 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5912 addrconf_set_nopolicy(*rtp, val); 5913 } 5914 } 5915 read_unlock(&table->tb6_lock); 5916 } 5917 spin_unlock(&ifa->lock); 5918 } 5919 read_unlock_bh(&idev->lock); 5920 } 5921 5922 static 5923 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5924 { 5925 struct inet6_dev *idev; 5926 struct net *net; 5927 5928 if (!rtnl_trylock()) 5929 return restart_syscall(); 5930 5931 *valp = val; 5932 5933 net = (struct net *)ctl->extra2; 5934 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5935 rtnl_unlock(); 5936 return 0; 5937 } 5938 5939 if (valp == &net->ipv6.devconf_all->disable_policy) { 5940 struct net_device *dev; 5941 5942 for_each_netdev(net, dev) { 5943 idev = __in6_dev_get(dev); 5944 if (idev) 5945 addrconf_disable_policy_idev(idev, val); 5946 } 5947 } else { 5948 idev = (struct inet6_dev *)ctl->extra1; 5949 addrconf_disable_policy_idev(idev, val); 5950 } 5951 5952 rtnl_unlock(); 5953 return 0; 5954 } 5955 5956 static 5957 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5958 void __user *buffer, size_t *lenp, 5959 loff_t *ppos) 5960 { 5961 int *valp = ctl->data; 5962 int val = *valp; 5963 loff_t pos = *ppos; 5964 struct ctl_table lctl; 5965 int ret; 5966 5967 lctl = *ctl; 5968 lctl.data = &val; 5969 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5970 5971 if (write && (*valp != val)) 5972 ret = addrconf_disable_policy(ctl, valp, val); 5973 5974 if (ret) 5975 *ppos = pos; 5976 5977 return ret; 5978 } 5979 5980 static int minus_one = -1; 5981 static const int one = 1; 5982 static const int two_five_five = 255; 5983 5984 static const struct ctl_table addrconf_sysctl[] = { 5985 { 5986 .procname = "forwarding", 5987 .data = &ipv6_devconf.forwarding, 5988 .maxlen = sizeof(int), 5989 .mode = 0644, 5990 .proc_handler = addrconf_sysctl_forward, 5991 }, 5992 { 5993 .procname = "hop_limit", 5994 .data = &ipv6_devconf.hop_limit, 5995 .maxlen = sizeof(int), 5996 .mode = 0644, 5997 .proc_handler = proc_dointvec_minmax, 5998 .extra1 = (void *)&one, 5999 .extra2 = (void *)&two_five_five, 6000 }, 6001 { 6002 .procname = "mtu", 6003 .data = &ipv6_devconf.mtu6, 6004 .maxlen = sizeof(int), 6005 .mode = 0644, 6006 .proc_handler = addrconf_sysctl_mtu, 6007 }, 6008 { 6009 .procname = "accept_ra", 6010 .data = &ipv6_devconf.accept_ra, 6011 .maxlen = sizeof(int), 6012 .mode = 0644, 6013 .proc_handler = proc_dointvec, 6014 }, 6015 { 6016 .procname = "accept_redirects", 6017 .data = &ipv6_devconf.accept_redirects, 6018 .maxlen = sizeof(int), 6019 .mode = 0644, 6020 .proc_handler = proc_dointvec, 6021 }, 6022 { 6023 .procname = "autoconf", 6024 .data = &ipv6_devconf.autoconf, 6025 .maxlen = sizeof(int), 6026 .mode = 0644, 6027 .proc_handler = proc_dointvec, 6028 }, 6029 { 6030 .procname = "dad_transmits", 6031 .data = &ipv6_devconf.dad_transmits, 6032 .maxlen = sizeof(int), 6033 .mode = 0644, 6034 .proc_handler = proc_dointvec, 6035 }, 6036 { 6037 .procname = "router_solicitations", 6038 .data = &ipv6_devconf.rtr_solicits, 6039 .maxlen = sizeof(int), 6040 .mode = 0644, 6041 .proc_handler = proc_dointvec_minmax, 6042 .extra1 = &minus_one, 6043 }, 6044 { 6045 .procname = "router_solicitation_interval", 6046 .data = &ipv6_devconf.rtr_solicit_interval, 6047 .maxlen = sizeof(int), 6048 .mode = 0644, 6049 .proc_handler = proc_dointvec_jiffies, 6050 }, 6051 { 6052 .procname = "router_solicitation_max_interval", 6053 .data = &ipv6_devconf.rtr_solicit_max_interval, 6054 .maxlen = sizeof(int), 6055 .mode = 0644, 6056 .proc_handler = proc_dointvec_jiffies, 6057 }, 6058 { 6059 .procname = "router_solicitation_delay", 6060 .data = &ipv6_devconf.rtr_solicit_delay, 6061 .maxlen = sizeof(int), 6062 .mode = 0644, 6063 .proc_handler = proc_dointvec_jiffies, 6064 }, 6065 { 6066 .procname = "force_mld_version", 6067 .data = &ipv6_devconf.force_mld_version, 6068 .maxlen = sizeof(int), 6069 .mode = 0644, 6070 .proc_handler = proc_dointvec, 6071 }, 6072 { 6073 .procname = "mldv1_unsolicited_report_interval", 6074 .data = 6075 &ipv6_devconf.mldv1_unsolicited_report_interval, 6076 .maxlen = sizeof(int), 6077 .mode = 0644, 6078 .proc_handler = proc_dointvec_ms_jiffies, 6079 }, 6080 { 6081 .procname = "mldv2_unsolicited_report_interval", 6082 .data = 6083 &ipv6_devconf.mldv2_unsolicited_report_interval, 6084 .maxlen = sizeof(int), 6085 .mode = 0644, 6086 .proc_handler = proc_dointvec_ms_jiffies, 6087 }, 6088 { 6089 .procname = "use_tempaddr", 6090 .data = &ipv6_devconf.use_tempaddr, 6091 .maxlen = sizeof(int), 6092 .mode = 0644, 6093 .proc_handler = proc_dointvec, 6094 }, 6095 { 6096 .procname = "temp_valid_lft", 6097 .data = &ipv6_devconf.temp_valid_lft, 6098 .maxlen = sizeof(int), 6099 .mode = 0644, 6100 .proc_handler = proc_dointvec, 6101 }, 6102 { 6103 .procname = "temp_prefered_lft", 6104 .data = &ipv6_devconf.temp_prefered_lft, 6105 .maxlen = sizeof(int), 6106 .mode = 0644, 6107 .proc_handler = proc_dointvec, 6108 }, 6109 { 6110 .procname = "regen_max_retry", 6111 .data = &ipv6_devconf.regen_max_retry, 6112 .maxlen = sizeof(int), 6113 .mode = 0644, 6114 .proc_handler = proc_dointvec, 6115 }, 6116 { 6117 .procname = "max_desync_factor", 6118 .data = &ipv6_devconf.max_desync_factor, 6119 .maxlen = sizeof(int), 6120 .mode = 0644, 6121 .proc_handler = proc_dointvec, 6122 }, 6123 { 6124 .procname = "max_addresses", 6125 .data = &ipv6_devconf.max_addresses, 6126 .maxlen = sizeof(int), 6127 .mode = 0644, 6128 .proc_handler = proc_dointvec, 6129 }, 6130 { 6131 .procname = "accept_ra_defrtr", 6132 .data = &ipv6_devconf.accept_ra_defrtr, 6133 .maxlen = sizeof(int), 6134 .mode = 0644, 6135 .proc_handler = proc_dointvec, 6136 }, 6137 { 6138 .procname = "accept_ra_min_hop_limit", 6139 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6140 .maxlen = sizeof(int), 6141 .mode = 0644, 6142 .proc_handler = proc_dointvec, 6143 }, 6144 { 6145 .procname = "accept_ra_pinfo", 6146 .data = &ipv6_devconf.accept_ra_pinfo, 6147 .maxlen = sizeof(int), 6148 .mode = 0644, 6149 .proc_handler = proc_dointvec, 6150 }, 6151 #ifdef CONFIG_IPV6_ROUTER_PREF 6152 { 6153 .procname = "accept_ra_rtr_pref", 6154 .data = &ipv6_devconf.accept_ra_rtr_pref, 6155 .maxlen = sizeof(int), 6156 .mode = 0644, 6157 .proc_handler = proc_dointvec, 6158 }, 6159 { 6160 .procname = "router_probe_interval", 6161 .data = &ipv6_devconf.rtr_probe_interval, 6162 .maxlen = sizeof(int), 6163 .mode = 0644, 6164 .proc_handler = proc_dointvec_jiffies, 6165 }, 6166 #ifdef CONFIG_IPV6_ROUTE_INFO 6167 { 6168 .procname = "accept_ra_rt_info_min_plen", 6169 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6170 .maxlen = sizeof(int), 6171 .mode = 0644, 6172 .proc_handler = proc_dointvec, 6173 }, 6174 { 6175 .procname = "accept_ra_rt_info_max_plen", 6176 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6177 .maxlen = sizeof(int), 6178 .mode = 0644, 6179 .proc_handler = proc_dointvec, 6180 }, 6181 #endif 6182 #endif 6183 { 6184 .procname = "proxy_ndp", 6185 .data = &ipv6_devconf.proxy_ndp, 6186 .maxlen = sizeof(int), 6187 .mode = 0644, 6188 .proc_handler = addrconf_sysctl_proxy_ndp, 6189 }, 6190 { 6191 .procname = "accept_source_route", 6192 .data = &ipv6_devconf.accept_source_route, 6193 .maxlen = sizeof(int), 6194 .mode = 0644, 6195 .proc_handler = proc_dointvec, 6196 }, 6197 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6198 { 6199 .procname = "optimistic_dad", 6200 .data = &ipv6_devconf.optimistic_dad, 6201 .maxlen = sizeof(int), 6202 .mode = 0644, 6203 .proc_handler = proc_dointvec, 6204 }, 6205 { 6206 .procname = "use_optimistic", 6207 .data = &ipv6_devconf.use_optimistic, 6208 .maxlen = sizeof(int), 6209 .mode = 0644, 6210 .proc_handler = proc_dointvec, 6211 }, 6212 #endif 6213 #ifdef CONFIG_IPV6_MROUTE 6214 { 6215 .procname = "mc_forwarding", 6216 .data = &ipv6_devconf.mc_forwarding, 6217 .maxlen = sizeof(int), 6218 .mode = 0444, 6219 .proc_handler = proc_dointvec, 6220 }, 6221 #endif 6222 { 6223 .procname = "disable_ipv6", 6224 .data = &ipv6_devconf.disable_ipv6, 6225 .maxlen = sizeof(int), 6226 .mode = 0644, 6227 .proc_handler = addrconf_sysctl_disable, 6228 }, 6229 { 6230 .procname = "accept_dad", 6231 .data = &ipv6_devconf.accept_dad, 6232 .maxlen = sizeof(int), 6233 .mode = 0644, 6234 .proc_handler = proc_dointvec, 6235 }, 6236 { 6237 .procname = "force_tllao", 6238 .data = &ipv6_devconf.force_tllao, 6239 .maxlen = sizeof(int), 6240 .mode = 0644, 6241 .proc_handler = proc_dointvec 6242 }, 6243 { 6244 .procname = "ndisc_notify", 6245 .data = &ipv6_devconf.ndisc_notify, 6246 .maxlen = sizeof(int), 6247 .mode = 0644, 6248 .proc_handler = proc_dointvec 6249 }, 6250 { 6251 .procname = "suppress_frag_ndisc", 6252 .data = &ipv6_devconf.suppress_frag_ndisc, 6253 .maxlen = sizeof(int), 6254 .mode = 0644, 6255 .proc_handler = proc_dointvec 6256 }, 6257 { 6258 .procname = "accept_ra_from_local", 6259 .data = &ipv6_devconf.accept_ra_from_local, 6260 .maxlen = sizeof(int), 6261 .mode = 0644, 6262 .proc_handler = proc_dointvec, 6263 }, 6264 { 6265 .procname = "accept_ra_mtu", 6266 .data = &ipv6_devconf.accept_ra_mtu, 6267 .maxlen = sizeof(int), 6268 .mode = 0644, 6269 .proc_handler = proc_dointvec, 6270 }, 6271 { 6272 .procname = "stable_secret", 6273 .data = &ipv6_devconf.stable_secret, 6274 .maxlen = IPV6_MAX_STRLEN, 6275 .mode = 0600, 6276 .proc_handler = addrconf_sysctl_stable_secret, 6277 }, 6278 { 6279 .procname = "use_oif_addrs_only", 6280 .data = &ipv6_devconf.use_oif_addrs_only, 6281 .maxlen = sizeof(int), 6282 .mode = 0644, 6283 .proc_handler = proc_dointvec, 6284 }, 6285 { 6286 .procname = "ignore_routes_with_linkdown", 6287 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6288 .maxlen = sizeof(int), 6289 .mode = 0644, 6290 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6291 }, 6292 { 6293 .procname = "drop_unicast_in_l2_multicast", 6294 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6295 .maxlen = sizeof(int), 6296 .mode = 0644, 6297 .proc_handler = proc_dointvec, 6298 }, 6299 { 6300 .procname = "drop_unsolicited_na", 6301 .data = &ipv6_devconf.drop_unsolicited_na, 6302 .maxlen = sizeof(int), 6303 .mode = 0644, 6304 .proc_handler = proc_dointvec, 6305 }, 6306 { 6307 .procname = "keep_addr_on_down", 6308 .data = &ipv6_devconf.keep_addr_on_down, 6309 .maxlen = sizeof(int), 6310 .mode = 0644, 6311 .proc_handler = proc_dointvec, 6312 6313 }, 6314 { 6315 .procname = "seg6_enabled", 6316 .data = &ipv6_devconf.seg6_enabled, 6317 .maxlen = sizeof(int), 6318 .mode = 0644, 6319 .proc_handler = proc_dointvec, 6320 }, 6321 #ifdef CONFIG_IPV6_SEG6_HMAC 6322 { 6323 .procname = "seg6_require_hmac", 6324 .data = &ipv6_devconf.seg6_require_hmac, 6325 .maxlen = sizeof(int), 6326 .mode = 0644, 6327 .proc_handler = proc_dointvec, 6328 }, 6329 #endif 6330 { 6331 .procname = "enhanced_dad", 6332 .data = &ipv6_devconf.enhanced_dad, 6333 .maxlen = sizeof(int), 6334 .mode = 0644, 6335 .proc_handler = proc_dointvec, 6336 }, 6337 { 6338 .procname = "addr_gen_mode", 6339 .data = &ipv6_devconf.addr_gen_mode, 6340 .maxlen = sizeof(int), 6341 .mode = 0644, 6342 .proc_handler = addrconf_sysctl_addr_gen_mode, 6343 }, 6344 { 6345 .procname = "disable_policy", 6346 .data = &ipv6_devconf.disable_policy, 6347 .maxlen = sizeof(int), 6348 .mode = 0644, 6349 .proc_handler = addrconf_sysctl_disable_policy, 6350 }, 6351 { 6352 /* sentinel */ 6353 } 6354 }; 6355 6356 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6357 struct inet6_dev *idev, struct ipv6_devconf *p) 6358 { 6359 int i, ifindex; 6360 struct ctl_table *table; 6361 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6362 6363 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6364 if (!table) 6365 goto out; 6366 6367 for (i = 0; table[i].data; i++) { 6368 table[i].data += (char *)p - (char *)&ipv6_devconf; 6369 /* If one of these is already set, then it is not safe to 6370 * overwrite either of them: this makes proc_dointvec_minmax 6371 * usable. 6372 */ 6373 if (!table[i].extra1 && !table[i].extra2) { 6374 table[i].extra1 = idev; /* embedded; no ref */ 6375 table[i].extra2 = net; 6376 } 6377 } 6378 6379 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6380 6381 p->sysctl_header = register_net_sysctl(net, path, table); 6382 if (!p->sysctl_header) 6383 goto free; 6384 6385 if (!strcmp(dev_name, "all")) 6386 ifindex = NETCONFA_IFINDEX_ALL; 6387 else if (!strcmp(dev_name, "default")) 6388 ifindex = NETCONFA_IFINDEX_DEFAULT; 6389 else 6390 ifindex = idev->dev->ifindex; 6391 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6392 ifindex, p); 6393 return 0; 6394 6395 free: 6396 kfree(table); 6397 out: 6398 return -ENOBUFS; 6399 } 6400 6401 static void __addrconf_sysctl_unregister(struct net *net, 6402 struct ipv6_devconf *p, int ifindex) 6403 { 6404 struct ctl_table *table; 6405 6406 if (!p->sysctl_header) 6407 return; 6408 6409 table = p->sysctl_header->ctl_table_arg; 6410 unregister_net_sysctl_table(p->sysctl_header); 6411 p->sysctl_header = NULL; 6412 kfree(table); 6413 6414 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6415 } 6416 6417 static int addrconf_sysctl_register(struct inet6_dev *idev) 6418 { 6419 int err; 6420 6421 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6422 return -EINVAL; 6423 6424 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6425 &ndisc_ifinfo_sysctl_change); 6426 if (err) 6427 return err; 6428 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6429 idev, &idev->cnf); 6430 if (err) 6431 neigh_sysctl_unregister(idev->nd_parms); 6432 6433 return err; 6434 } 6435 6436 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6437 { 6438 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6439 idev->dev->ifindex); 6440 neigh_sysctl_unregister(idev->nd_parms); 6441 } 6442 6443 6444 #endif 6445 6446 static int __net_init addrconf_init_net(struct net *net) 6447 { 6448 int err = -ENOMEM; 6449 struct ipv6_devconf *all, *dflt; 6450 6451 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6452 if (!all) 6453 goto err_alloc_all; 6454 6455 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6456 if (!dflt) 6457 goto err_alloc_dflt; 6458 6459 /* these will be inherited by all namespaces */ 6460 dflt->autoconf = ipv6_defaults.autoconf; 6461 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6462 6463 dflt->stable_secret.initialized = false; 6464 all->stable_secret.initialized = false; 6465 6466 net->ipv6.devconf_all = all; 6467 net->ipv6.devconf_dflt = dflt; 6468 6469 #ifdef CONFIG_SYSCTL 6470 err = __addrconf_sysctl_register(net, "all", NULL, all); 6471 if (err < 0) 6472 goto err_reg_all; 6473 6474 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6475 if (err < 0) 6476 goto err_reg_dflt; 6477 #endif 6478 return 0; 6479 6480 #ifdef CONFIG_SYSCTL 6481 err_reg_dflt: 6482 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6483 err_reg_all: 6484 kfree(dflt); 6485 #endif 6486 err_alloc_dflt: 6487 kfree(all); 6488 err_alloc_all: 6489 return err; 6490 } 6491 6492 static void __net_exit addrconf_exit_net(struct net *net) 6493 { 6494 #ifdef CONFIG_SYSCTL 6495 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6496 NETCONFA_IFINDEX_DEFAULT); 6497 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6498 NETCONFA_IFINDEX_ALL); 6499 #endif 6500 kfree(net->ipv6.devconf_dflt); 6501 kfree(net->ipv6.devconf_all); 6502 } 6503 6504 static struct pernet_operations addrconf_ops = { 6505 .init = addrconf_init_net, 6506 .exit = addrconf_exit_net, 6507 }; 6508 6509 static struct rtnl_af_ops inet6_ops __read_mostly = { 6510 .family = AF_INET6, 6511 .fill_link_af = inet6_fill_link_af, 6512 .get_link_af_size = inet6_get_link_af_size, 6513 .validate_link_af = inet6_validate_link_af, 6514 .set_link_af = inet6_set_link_af, 6515 }; 6516 6517 /* 6518 * Init / cleanup code 6519 */ 6520 6521 int __init addrconf_init(void) 6522 { 6523 struct inet6_dev *idev; 6524 int i, err; 6525 6526 err = ipv6_addr_label_init(); 6527 if (err < 0) { 6528 pr_crit("%s: cannot initialize default policy table: %d\n", 6529 __func__, err); 6530 goto out; 6531 } 6532 6533 err = register_pernet_subsys(&addrconf_ops); 6534 if (err < 0) 6535 goto out_addrlabel; 6536 6537 addrconf_wq = create_workqueue("ipv6_addrconf"); 6538 if (!addrconf_wq) { 6539 err = -ENOMEM; 6540 goto out_nowq; 6541 } 6542 6543 /* The addrconf netdev notifier requires that loopback_dev 6544 * has it's ipv6 private information allocated and setup 6545 * before it can bring up and give link-local addresses 6546 * to other devices which are up. 6547 * 6548 * Unfortunately, loopback_dev is not necessarily the first 6549 * entry in the global dev_base list of net devices. In fact, 6550 * it is likely to be the very last entry on that list. 6551 * So this causes the notifier registry below to try and 6552 * give link-local addresses to all devices besides loopback_dev 6553 * first, then loopback_dev, which cases all the non-loopback_dev 6554 * devices to fail to get a link-local address. 6555 * 6556 * So, as a temporary fix, allocate the ipv6 structure for 6557 * loopback_dev first by hand. 6558 * Longer term, all of the dependencies ipv6 has upon the loopback 6559 * device and it being up should be removed. 6560 */ 6561 rtnl_lock(); 6562 idev = ipv6_add_dev(init_net.loopback_dev); 6563 rtnl_unlock(); 6564 if (IS_ERR(idev)) { 6565 err = PTR_ERR(idev); 6566 goto errlo; 6567 } 6568 6569 ip6_route_init_special_entries(); 6570 6571 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6572 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6573 6574 register_netdevice_notifier(&ipv6_dev_notf); 6575 6576 addrconf_verify(); 6577 6578 rtnl_af_register(&inet6_ops); 6579 6580 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6581 0); 6582 if (err < 0) 6583 goto errout; 6584 6585 /* Only the first call to __rtnl_register can fail */ 6586 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0); 6587 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0); 6588 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6589 inet6_dump_ifaddr, 0); 6590 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6591 inet6_dump_ifmcaddr, 0); 6592 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6593 inet6_dump_ifacaddr, 0); 6594 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6595 inet6_netconf_dump_devconf, 0); 6596 6597 ipv6_addr_label_rtnl_register(); 6598 6599 return 0; 6600 errout: 6601 rtnl_af_unregister(&inet6_ops); 6602 unregister_netdevice_notifier(&ipv6_dev_notf); 6603 errlo: 6604 destroy_workqueue(addrconf_wq); 6605 out_nowq: 6606 unregister_pernet_subsys(&addrconf_ops); 6607 out_addrlabel: 6608 ipv6_addr_label_cleanup(); 6609 out: 6610 return err; 6611 } 6612 6613 void addrconf_cleanup(void) 6614 { 6615 struct net_device *dev; 6616 int i; 6617 6618 unregister_netdevice_notifier(&ipv6_dev_notf); 6619 unregister_pernet_subsys(&addrconf_ops); 6620 ipv6_addr_label_cleanup(); 6621 6622 rtnl_lock(); 6623 6624 __rtnl_af_unregister(&inet6_ops); 6625 6626 /* clean dev list */ 6627 for_each_netdev(&init_net, dev) { 6628 if (__in6_dev_get(dev) == NULL) 6629 continue; 6630 addrconf_ifdown(dev, 1); 6631 } 6632 addrconf_ifdown(init_net.loopback_dev, 2); 6633 6634 /* 6635 * Check hash table. 6636 */ 6637 spin_lock_bh(&addrconf_hash_lock); 6638 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6639 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6640 spin_unlock_bh(&addrconf_hash_lock); 6641 cancel_delayed_work(&addr_chk_work); 6642 rtnl_unlock(); 6643 6644 destroy_workqueue(addrconf_wq); 6645 } 6646