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 ipv6_del_addr(ifp); 3339 write_lock_bh(&idev->lock); 3340 3341 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3342 idev->dev->name, &ifp->addr); 3343 } 3344 } 3345 3346 write_unlock_bh(&idev->lock); 3347 } 3348 3349 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3350 void *ptr) 3351 { 3352 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3353 struct netdev_notifier_changeupper_info *info; 3354 struct inet6_dev *idev = __in6_dev_get(dev); 3355 struct net *net = dev_net(dev); 3356 int run_pending = 0; 3357 int err; 3358 3359 switch (event) { 3360 case NETDEV_REGISTER: 3361 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3362 idev = ipv6_add_dev(dev); 3363 if (IS_ERR(idev)) 3364 return notifier_from_errno(PTR_ERR(idev)); 3365 } 3366 break; 3367 3368 case NETDEV_CHANGEMTU: 3369 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3370 if (dev->mtu < IPV6_MIN_MTU) { 3371 addrconf_ifdown(dev, dev != net->loopback_dev); 3372 break; 3373 } 3374 3375 if (idev) { 3376 rt6_mtu_change(dev, dev->mtu); 3377 idev->cnf.mtu6 = dev->mtu; 3378 break; 3379 } 3380 3381 /* allocate new idev */ 3382 idev = ipv6_add_dev(dev); 3383 if (IS_ERR(idev)) 3384 break; 3385 3386 /* device is still not ready */ 3387 if (!(idev->if_flags & IF_READY)) 3388 break; 3389 3390 run_pending = 1; 3391 3392 /* fall through */ 3393 3394 case NETDEV_UP: 3395 case NETDEV_CHANGE: 3396 if (dev->flags & IFF_SLAVE) 3397 break; 3398 3399 if (idev && idev->cnf.disable_ipv6) 3400 break; 3401 3402 if (event == NETDEV_UP) { 3403 /* restore routes for permanent addresses */ 3404 addrconf_permanent_addr(dev); 3405 3406 if (!addrconf_qdisc_ok(dev)) { 3407 /* device is not ready yet. */ 3408 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3409 dev->name); 3410 break; 3411 } 3412 3413 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3414 idev = ipv6_add_dev(dev); 3415 3416 if (!IS_ERR_OR_NULL(idev)) { 3417 idev->if_flags |= IF_READY; 3418 run_pending = 1; 3419 } 3420 } else if (event == NETDEV_CHANGE) { 3421 if (!addrconf_qdisc_ok(dev)) { 3422 /* device is still not ready. */ 3423 break; 3424 } 3425 3426 if (idev) { 3427 if (idev->if_flags & IF_READY) { 3428 /* device is already configured - 3429 * but resend MLD reports, we might 3430 * have roamed and need to update 3431 * multicast snooping switches 3432 */ 3433 ipv6_mc_up(idev); 3434 break; 3435 } 3436 idev->if_flags |= IF_READY; 3437 } 3438 3439 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3440 dev->name); 3441 3442 run_pending = 1; 3443 } 3444 3445 switch (dev->type) { 3446 #if IS_ENABLED(CONFIG_IPV6_SIT) 3447 case ARPHRD_SIT: 3448 addrconf_sit_config(dev); 3449 break; 3450 #endif 3451 #if IS_ENABLED(CONFIG_NET_IPGRE) 3452 case ARPHRD_IPGRE: 3453 addrconf_gre_config(dev); 3454 break; 3455 #endif 3456 case ARPHRD_LOOPBACK: 3457 init_loopback(dev); 3458 break; 3459 3460 default: 3461 addrconf_dev_config(dev); 3462 break; 3463 } 3464 3465 if (!IS_ERR_OR_NULL(idev)) { 3466 if (run_pending) 3467 addrconf_dad_run(idev); 3468 3469 /* 3470 * If the MTU changed during the interface down, 3471 * when the interface up, the changed MTU must be 3472 * reflected in the idev as well as routers. 3473 */ 3474 if (idev->cnf.mtu6 != dev->mtu && 3475 dev->mtu >= IPV6_MIN_MTU) { 3476 rt6_mtu_change(dev, dev->mtu); 3477 idev->cnf.mtu6 = dev->mtu; 3478 } 3479 idev->tstamp = jiffies; 3480 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3481 3482 /* 3483 * If the changed mtu during down is lower than 3484 * IPV6_MIN_MTU stop IPv6 on this interface. 3485 */ 3486 if (dev->mtu < IPV6_MIN_MTU) 3487 addrconf_ifdown(dev, dev != net->loopback_dev); 3488 } 3489 break; 3490 3491 case NETDEV_DOWN: 3492 case NETDEV_UNREGISTER: 3493 /* 3494 * Remove all addresses from this interface. 3495 */ 3496 addrconf_ifdown(dev, event != NETDEV_DOWN); 3497 break; 3498 3499 case NETDEV_CHANGENAME: 3500 if (idev) { 3501 snmp6_unregister_dev(idev); 3502 addrconf_sysctl_unregister(idev); 3503 err = addrconf_sysctl_register(idev); 3504 if (err) 3505 return notifier_from_errno(err); 3506 err = snmp6_register_dev(idev); 3507 if (err) { 3508 addrconf_sysctl_unregister(idev); 3509 return notifier_from_errno(err); 3510 } 3511 } 3512 break; 3513 3514 case NETDEV_PRE_TYPE_CHANGE: 3515 case NETDEV_POST_TYPE_CHANGE: 3516 if (idev) 3517 addrconf_type_change(dev, event); 3518 break; 3519 3520 case NETDEV_CHANGEUPPER: 3521 info = ptr; 3522 3523 /* flush all routes if dev is linked to or unlinked from 3524 * an L3 master device (e.g., VRF) 3525 */ 3526 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3527 addrconf_ifdown(dev, 0); 3528 } 3529 3530 return NOTIFY_OK; 3531 } 3532 3533 /* 3534 * addrconf module should be notified of a device going up 3535 */ 3536 static struct notifier_block ipv6_dev_notf = { 3537 .notifier_call = addrconf_notify, 3538 .priority = ADDRCONF_NOTIFY_PRIORITY, 3539 }; 3540 3541 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3542 { 3543 struct inet6_dev *idev; 3544 ASSERT_RTNL(); 3545 3546 idev = __in6_dev_get(dev); 3547 3548 if (event == NETDEV_POST_TYPE_CHANGE) 3549 ipv6_mc_remap(idev); 3550 else if (event == NETDEV_PRE_TYPE_CHANGE) 3551 ipv6_mc_unmap(idev); 3552 } 3553 3554 static bool addr_is_local(const struct in6_addr *addr) 3555 { 3556 return ipv6_addr_type(addr) & 3557 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3558 } 3559 3560 static int addrconf_ifdown(struct net_device *dev, int how) 3561 { 3562 struct net *net = dev_net(dev); 3563 struct inet6_dev *idev; 3564 struct inet6_ifaddr *ifa, *tmp; 3565 struct list_head del_list; 3566 int _keep_addr; 3567 bool keep_addr; 3568 int state, i; 3569 3570 ASSERT_RTNL(); 3571 3572 rt6_ifdown(net, dev); 3573 neigh_ifdown(&nd_tbl, dev); 3574 3575 idev = __in6_dev_get(dev); 3576 if (!idev) 3577 return -ENODEV; 3578 3579 /* 3580 * Step 1: remove reference to ipv6 device from parent device. 3581 * Do not dev_put! 3582 */ 3583 if (how) { 3584 idev->dead = 1; 3585 3586 /* protected by rtnl_lock */ 3587 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3588 3589 /* Step 1.5: remove snmp6 entry */ 3590 snmp6_unregister_dev(idev); 3591 3592 } 3593 3594 /* aggregate the system setting and interface setting */ 3595 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3596 if (!_keep_addr) 3597 _keep_addr = idev->cnf.keep_addr_on_down; 3598 3599 /* combine the user config with event to determine if permanent 3600 * addresses are to be removed from address hash table 3601 */ 3602 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3603 3604 /* Step 2: clear hash table */ 3605 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3606 struct hlist_head *h = &inet6_addr_lst[i]; 3607 3608 spin_lock_bh(&addrconf_hash_lock); 3609 restart: 3610 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3611 if (ifa->idev == idev) { 3612 addrconf_del_dad_work(ifa); 3613 /* combined flag + permanent flag decide if 3614 * address is retained on a down event 3615 */ 3616 if (!keep_addr || 3617 !(ifa->flags & IFA_F_PERMANENT) || 3618 addr_is_local(&ifa->addr)) { 3619 hlist_del_init_rcu(&ifa->addr_lst); 3620 goto restart; 3621 } 3622 } 3623 } 3624 spin_unlock_bh(&addrconf_hash_lock); 3625 } 3626 3627 write_lock_bh(&idev->lock); 3628 3629 addrconf_del_rs_timer(idev); 3630 3631 /* Step 2: clear flags for stateless addrconf */ 3632 if (!how) 3633 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3634 3635 /* Step 3: clear tempaddr list */ 3636 while (!list_empty(&idev->tempaddr_list)) { 3637 ifa = list_first_entry(&idev->tempaddr_list, 3638 struct inet6_ifaddr, tmp_list); 3639 list_del(&ifa->tmp_list); 3640 write_unlock_bh(&idev->lock); 3641 spin_lock_bh(&ifa->lock); 3642 3643 if (ifa->ifpub) { 3644 in6_ifa_put(ifa->ifpub); 3645 ifa->ifpub = NULL; 3646 } 3647 spin_unlock_bh(&ifa->lock); 3648 in6_ifa_put(ifa); 3649 write_lock_bh(&idev->lock); 3650 } 3651 3652 /* re-combine the user config with event to determine if permanent 3653 * addresses are to be removed from the interface list 3654 */ 3655 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3656 3657 INIT_LIST_HEAD(&del_list); 3658 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3659 struct rt6_info *rt = NULL; 3660 bool keep; 3661 3662 addrconf_del_dad_work(ifa); 3663 3664 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3665 !addr_is_local(&ifa->addr); 3666 if (!keep) 3667 list_move(&ifa->if_list, &del_list); 3668 3669 write_unlock_bh(&idev->lock); 3670 spin_lock_bh(&ifa->lock); 3671 3672 if (keep) { 3673 /* set state to skip the notifier below */ 3674 state = INET6_IFADDR_STATE_DEAD; 3675 ifa->state = INET6_IFADDR_STATE_PREDAD; 3676 if (!(ifa->flags & IFA_F_NODAD)) 3677 ifa->flags |= IFA_F_TENTATIVE; 3678 3679 rt = ifa->rt; 3680 ifa->rt = NULL; 3681 } else { 3682 state = ifa->state; 3683 ifa->state = INET6_IFADDR_STATE_DEAD; 3684 } 3685 3686 spin_unlock_bh(&ifa->lock); 3687 3688 if (rt) 3689 ip6_del_rt(rt); 3690 3691 if (state != INET6_IFADDR_STATE_DEAD) { 3692 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3693 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3694 } else { 3695 if (idev->cnf.forwarding) 3696 addrconf_leave_anycast(ifa); 3697 addrconf_leave_solict(ifa->idev, &ifa->addr); 3698 } 3699 3700 write_lock_bh(&idev->lock); 3701 } 3702 3703 write_unlock_bh(&idev->lock); 3704 3705 /* now clean up addresses to be removed */ 3706 while (!list_empty(&del_list)) { 3707 ifa = list_first_entry(&del_list, 3708 struct inet6_ifaddr, if_list); 3709 list_del(&ifa->if_list); 3710 3711 in6_ifa_put(ifa); 3712 } 3713 3714 /* Step 5: Discard anycast and multicast list */ 3715 if (how) { 3716 ipv6_ac_destroy_dev(idev); 3717 ipv6_mc_destroy_dev(idev); 3718 } else { 3719 ipv6_mc_down(idev); 3720 } 3721 3722 idev->tstamp = jiffies; 3723 3724 /* Last: Shot the device (if unregistered) */ 3725 if (how) { 3726 addrconf_sysctl_unregister(idev); 3727 neigh_parms_release(&nd_tbl, idev->nd_parms); 3728 neigh_ifdown(&nd_tbl, dev); 3729 in6_dev_put(idev); 3730 } 3731 return 0; 3732 } 3733 3734 static void addrconf_rs_timer(unsigned long data) 3735 { 3736 struct inet6_dev *idev = (struct inet6_dev *)data; 3737 struct net_device *dev = idev->dev; 3738 struct in6_addr lladdr; 3739 3740 write_lock(&idev->lock); 3741 if (idev->dead || !(idev->if_flags & IF_READY)) 3742 goto out; 3743 3744 if (!ipv6_accept_ra(idev)) 3745 goto out; 3746 3747 /* Announcement received after solicitation was sent */ 3748 if (idev->if_flags & IF_RA_RCVD) 3749 goto out; 3750 3751 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3752 write_unlock(&idev->lock); 3753 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3754 ndisc_send_rs(dev, &lladdr, 3755 &in6addr_linklocal_allrouters); 3756 else 3757 goto put; 3758 3759 write_lock(&idev->lock); 3760 idev->rs_interval = rfc3315_s14_backoff_update( 3761 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3762 /* The wait after the last probe can be shorter */ 3763 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3764 idev->cnf.rtr_solicits) ? 3765 idev->cnf.rtr_solicit_delay : 3766 idev->rs_interval); 3767 } else { 3768 /* 3769 * Note: we do not support deprecated "all on-link" 3770 * assumption any longer. 3771 */ 3772 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3773 } 3774 3775 out: 3776 write_unlock(&idev->lock); 3777 put: 3778 in6_dev_put(idev); 3779 } 3780 3781 /* 3782 * Duplicate Address Detection 3783 */ 3784 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3785 { 3786 unsigned long rand_num; 3787 struct inet6_dev *idev = ifp->idev; 3788 u64 nonce; 3789 3790 if (ifp->flags & IFA_F_OPTIMISTIC) 3791 rand_num = 0; 3792 else 3793 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3794 3795 nonce = 0; 3796 if (idev->cnf.enhanced_dad || 3797 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3798 do 3799 get_random_bytes(&nonce, 6); 3800 while (nonce == 0); 3801 } 3802 ifp->dad_nonce = nonce; 3803 ifp->dad_probes = idev->cnf.dad_transmits; 3804 addrconf_mod_dad_work(ifp, rand_num); 3805 } 3806 3807 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3808 { 3809 struct inet6_dev *idev = ifp->idev; 3810 struct net_device *dev = idev->dev; 3811 bool bump_id, notify = false; 3812 3813 addrconf_join_solict(dev, &ifp->addr); 3814 3815 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3816 3817 read_lock_bh(&idev->lock); 3818 spin_lock(&ifp->lock); 3819 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3820 goto out; 3821 3822 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3823 dev_net(dev)->ipv6.devconf_all->accept_dad < 1 || 3824 idev->cnf.accept_dad < 1 || 3825 !(ifp->flags&IFA_F_TENTATIVE) || 3826 ifp->flags & IFA_F_NODAD) { 3827 bump_id = ifp->flags & IFA_F_TENTATIVE; 3828 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3829 spin_unlock(&ifp->lock); 3830 read_unlock_bh(&idev->lock); 3831 3832 addrconf_dad_completed(ifp, bump_id); 3833 return; 3834 } 3835 3836 if (!(idev->if_flags & IF_READY)) { 3837 spin_unlock(&ifp->lock); 3838 read_unlock_bh(&idev->lock); 3839 /* 3840 * If the device is not ready: 3841 * - keep it tentative if it is a permanent address. 3842 * - otherwise, kill it. 3843 */ 3844 in6_ifa_hold(ifp); 3845 addrconf_dad_stop(ifp, 0); 3846 return; 3847 } 3848 3849 /* 3850 * Optimistic nodes can start receiving 3851 * Frames right away 3852 */ 3853 if (ifp->flags & IFA_F_OPTIMISTIC) { 3854 ip6_ins_rt(ifp->rt); 3855 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3856 /* Because optimistic nodes can use this address, 3857 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3858 */ 3859 notify = true; 3860 } 3861 } 3862 3863 addrconf_dad_kick(ifp); 3864 out: 3865 spin_unlock(&ifp->lock); 3866 read_unlock_bh(&idev->lock); 3867 if (notify) 3868 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3869 } 3870 3871 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3872 { 3873 bool begin_dad = false; 3874 3875 spin_lock_bh(&ifp->lock); 3876 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3877 ifp->state = INET6_IFADDR_STATE_PREDAD; 3878 begin_dad = true; 3879 } 3880 spin_unlock_bh(&ifp->lock); 3881 3882 if (begin_dad) 3883 addrconf_mod_dad_work(ifp, 0); 3884 } 3885 3886 static void addrconf_dad_work(struct work_struct *w) 3887 { 3888 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3889 struct inet6_ifaddr, 3890 dad_work); 3891 struct inet6_dev *idev = ifp->idev; 3892 bool bump_id, disable_ipv6 = false; 3893 struct in6_addr mcaddr; 3894 3895 enum { 3896 DAD_PROCESS, 3897 DAD_BEGIN, 3898 DAD_ABORT, 3899 } action = DAD_PROCESS; 3900 3901 rtnl_lock(); 3902 3903 spin_lock_bh(&ifp->lock); 3904 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3905 action = DAD_BEGIN; 3906 ifp->state = INET6_IFADDR_STATE_DAD; 3907 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3908 action = DAD_ABORT; 3909 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3910 3911 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3912 idev->cnf.accept_dad > 1) && 3913 !idev->cnf.disable_ipv6 && 3914 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3915 struct in6_addr addr; 3916 3917 addr.s6_addr32[0] = htonl(0xfe800000); 3918 addr.s6_addr32[1] = 0; 3919 3920 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3921 ipv6_addr_equal(&ifp->addr, &addr)) { 3922 /* DAD failed for link-local based on MAC */ 3923 idev->cnf.disable_ipv6 = 1; 3924 3925 pr_info("%s: IPv6 being disabled!\n", 3926 ifp->idev->dev->name); 3927 disable_ipv6 = true; 3928 } 3929 } 3930 } 3931 spin_unlock_bh(&ifp->lock); 3932 3933 if (action == DAD_BEGIN) { 3934 addrconf_dad_begin(ifp); 3935 goto out; 3936 } else if (action == DAD_ABORT) { 3937 in6_ifa_hold(ifp); 3938 addrconf_dad_stop(ifp, 1); 3939 if (disable_ipv6) 3940 addrconf_ifdown(idev->dev, 0); 3941 goto out; 3942 } 3943 3944 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3945 goto out; 3946 3947 write_lock_bh(&idev->lock); 3948 if (idev->dead || !(idev->if_flags & IF_READY)) { 3949 write_unlock_bh(&idev->lock); 3950 goto out; 3951 } 3952 3953 spin_lock(&ifp->lock); 3954 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3955 spin_unlock(&ifp->lock); 3956 write_unlock_bh(&idev->lock); 3957 goto out; 3958 } 3959 3960 if (ifp->dad_probes == 0) { 3961 /* 3962 * DAD was successful 3963 */ 3964 3965 bump_id = ifp->flags & IFA_F_TENTATIVE; 3966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3967 spin_unlock(&ifp->lock); 3968 write_unlock_bh(&idev->lock); 3969 3970 addrconf_dad_completed(ifp, bump_id); 3971 3972 goto out; 3973 } 3974 3975 ifp->dad_probes--; 3976 addrconf_mod_dad_work(ifp, 3977 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3978 spin_unlock(&ifp->lock); 3979 write_unlock_bh(&idev->lock); 3980 3981 /* send a neighbour solicitation for our addr */ 3982 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3983 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3984 ifp->dad_nonce); 3985 out: 3986 in6_ifa_put(ifp); 3987 rtnl_unlock(); 3988 } 3989 3990 /* ifp->idev must be at least read locked */ 3991 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3992 { 3993 struct inet6_ifaddr *ifpiter; 3994 struct inet6_dev *idev = ifp->idev; 3995 3996 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3997 if (ifpiter->scope > IFA_LINK) 3998 break; 3999 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4000 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4001 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4002 IFA_F_PERMANENT) 4003 return false; 4004 } 4005 return true; 4006 } 4007 4008 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4009 { 4010 struct net_device *dev = ifp->idev->dev; 4011 struct in6_addr lladdr; 4012 bool send_rs, send_mld; 4013 4014 addrconf_del_dad_work(ifp); 4015 4016 /* 4017 * Configure the address for reception. Now it is valid. 4018 */ 4019 4020 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4021 4022 /* If added prefix is link local and we are prepared to process 4023 router advertisements, start sending router solicitations. 4024 */ 4025 4026 read_lock_bh(&ifp->idev->lock); 4027 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4028 send_rs = send_mld && 4029 ipv6_accept_ra(ifp->idev) && 4030 ifp->idev->cnf.rtr_solicits != 0 && 4031 (dev->flags&IFF_LOOPBACK) == 0; 4032 read_unlock_bh(&ifp->idev->lock); 4033 4034 /* While dad is in progress mld report's source address is in6_addrany. 4035 * Resend with proper ll now. 4036 */ 4037 if (send_mld) 4038 ipv6_mc_dad_complete(ifp->idev); 4039 4040 if (send_rs) { 4041 /* 4042 * If a host as already performed a random delay 4043 * [...] as part of DAD [...] there is no need 4044 * to delay again before sending the first RS 4045 */ 4046 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4047 return; 4048 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4049 4050 write_lock_bh(&ifp->idev->lock); 4051 spin_lock(&ifp->lock); 4052 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4053 ifp->idev->cnf.rtr_solicit_interval); 4054 ifp->idev->rs_probes = 1; 4055 ifp->idev->if_flags |= IF_RS_SENT; 4056 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4057 spin_unlock(&ifp->lock); 4058 write_unlock_bh(&ifp->idev->lock); 4059 } 4060 4061 if (bump_id) 4062 rt_genid_bump_ipv6(dev_net(dev)); 4063 4064 /* Make sure that a new temporary address will be created 4065 * before this temporary address becomes deprecated. 4066 */ 4067 if (ifp->flags & IFA_F_TEMPORARY) 4068 addrconf_verify_rtnl(); 4069 } 4070 4071 static void addrconf_dad_run(struct inet6_dev *idev) 4072 { 4073 struct inet6_ifaddr *ifp; 4074 4075 read_lock_bh(&idev->lock); 4076 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4077 spin_lock(&ifp->lock); 4078 if (ifp->flags & IFA_F_TENTATIVE && 4079 ifp->state == INET6_IFADDR_STATE_DAD) 4080 addrconf_dad_kick(ifp); 4081 spin_unlock(&ifp->lock); 4082 } 4083 read_unlock_bh(&idev->lock); 4084 } 4085 4086 #ifdef CONFIG_PROC_FS 4087 struct if6_iter_state { 4088 struct seq_net_private p; 4089 int bucket; 4090 int offset; 4091 }; 4092 4093 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4094 { 4095 struct inet6_ifaddr *ifa = NULL; 4096 struct if6_iter_state *state = seq->private; 4097 struct net *net = seq_file_net(seq); 4098 int p = 0; 4099 4100 /* initial bucket if pos is 0 */ 4101 if (pos == 0) { 4102 state->bucket = 0; 4103 state->offset = 0; 4104 } 4105 4106 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4107 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4108 addr_lst) { 4109 if (!net_eq(dev_net(ifa->idev->dev), net)) 4110 continue; 4111 /* sync with offset */ 4112 if (p < state->offset) { 4113 p++; 4114 continue; 4115 } 4116 state->offset++; 4117 return ifa; 4118 } 4119 4120 /* prepare for next bucket */ 4121 state->offset = 0; 4122 p = 0; 4123 } 4124 return NULL; 4125 } 4126 4127 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4128 struct inet6_ifaddr *ifa) 4129 { 4130 struct if6_iter_state *state = seq->private; 4131 struct net *net = seq_file_net(seq); 4132 4133 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4134 if (!net_eq(dev_net(ifa->idev->dev), net)) 4135 continue; 4136 state->offset++; 4137 return ifa; 4138 } 4139 4140 while (++state->bucket < IN6_ADDR_HSIZE) { 4141 state->offset = 0; 4142 hlist_for_each_entry_rcu_bh(ifa, 4143 &inet6_addr_lst[state->bucket], addr_lst) { 4144 if (!net_eq(dev_net(ifa->idev->dev), net)) 4145 continue; 4146 state->offset++; 4147 return ifa; 4148 } 4149 } 4150 4151 return NULL; 4152 } 4153 4154 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4155 __acquires(rcu_bh) 4156 { 4157 rcu_read_lock_bh(); 4158 return if6_get_first(seq, *pos); 4159 } 4160 4161 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4162 { 4163 struct inet6_ifaddr *ifa; 4164 4165 ifa = if6_get_next(seq, v); 4166 ++*pos; 4167 return ifa; 4168 } 4169 4170 static void if6_seq_stop(struct seq_file *seq, void *v) 4171 __releases(rcu_bh) 4172 { 4173 rcu_read_unlock_bh(); 4174 } 4175 4176 static int if6_seq_show(struct seq_file *seq, void *v) 4177 { 4178 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4179 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4180 &ifp->addr, 4181 ifp->idev->dev->ifindex, 4182 ifp->prefix_len, 4183 ifp->scope, 4184 (u8) ifp->flags, 4185 ifp->idev->dev->name); 4186 return 0; 4187 } 4188 4189 static const struct seq_operations if6_seq_ops = { 4190 .start = if6_seq_start, 4191 .next = if6_seq_next, 4192 .show = if6_seq_show, 4193 .stop = if6_seq_stop, 4194 }; 4195 4196 static int if6_seq_open(struct inode *inode, struct file *file) 4197 { 4198 return seq_open_net(inode, file, &if6_seq_ops, 4199 sizeof(struct if6_iter_state)); 4200 } 4201 4202 static const struct file_operations if6_fops = { 4203 .owner = THIS_MODULE, 4204 .open = if6_seq_open, 4205 .read = seq_read, 4206 .llseek = seq_lseek, 4207 .release = seq_release_net, 4208 }; 4209 4210 static int __net_init if6_proc_net_init(struct net *net) 4211 { 4212 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4213 return -ENOMEM; 4214 return 0; 4215 } 4216 4217 static void __net_exit if6_proc_net_exit(struct net *net) 4218 { 4219 remove_proc_entry("if_inet6", net->proc_net); 4220 } 4221 4222 static struct pernet_operations if6_proc_net_ops = { 4223 .init = if6_proc_net_init, 4224 .exit = if6_proc_net_exit, 4225 }; 4226 4227 int __init if6_proc_init(void) 4228 { 4229 return register_pernet_subsys(&if6_proc_net_ops); 4230 } 4231 4232 void if6_proc_exit(void) 4233 { 4234 unregister_pernet_subsys(&if6_proc_net_ops); 4235 } 4236 #endif /* CONFIG_PROC_FS */ 4237 4238 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4239 /* Check if address is a home address configured on any interface. */ 4240 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4241 { 4242 int ret = 0; 4243 struct inet6_ifaddr *ifp = NULL; 4244 unsigned int hash = inet6_addr_hash(addr); 4245 4246 rcu_read_lock_bh(); 4247 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4248 if (!net_eq(dev_net(ifp->idev->dev), net)) 4249 continue; 4250 if (ipv6_addr_equal(&ifp->addr, addr) && 4251 (ifp->flags & IFA_F_HOMEADDRESS)) { 4252 ret = 1; 4253 break; 4254 } 4255 } 4256 rcu_read_unlock_bh(); 4257 return ret; 4258 } 4259 #endif 4260 4261 /* 4262 * Periodic address status verification 4263 */ 4264 4265 static void addrconf_verify_rtnl(void) 4266 { 4267 unsigned long now, next, next_sec, next_sched; 4268 struct inet6_ifaddr *ifp; 4269 int i; 4270 4271 ASSERT_RTNL(); 4272 4273 rcu_read_lock_bh(); 4274 now = jiffies; 4275 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4276 4277 cancel_delayed_work(&addr_chk_work); 4278 4279 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4280 restart: 4281 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4282 unsigned long age; 4283 4284 /* When setting preferred_lft to a value not zero or 4285 * infinity, while valid_lft is infinity 4286 * IFA_F_PERMANENT has a non-infinity life time. 4287 */ 4288 if ((ifp->flags & IFA_F_PERMANENT) && 4289 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4290 continue; 4291 4292 spin_lock(&ifp->lock); 4293 /* We try to batch several events at once. */ 4294 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4295 4296 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4297 age >= ifp->valid_lft) { 4298 spin_unlock(&ifp->lock); 4299 in6_ifa_hold(ifp); 4300 ipv6_del_addr(ifp); 4301 goto restart; 4302 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4303 spin_unlock(&ifp->lock); 4304 continue; 4305 } else if (age >= ifp->prefered_lft) { 4306 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4307 int deprecate = 0; 4308 4309 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4310 deprecate = 1; 4311 ifp->flags |= IFA_F_DEPRECATED; 4312 } 4313 4314 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4315 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4316 next = ifp->tstamp + ifp->valid_lft * HZ; 4317 4318 spin_unlock(&ifp->lock); 4319 4320 if (deprecate) { 4321 in6_ifa_hold(ifp); 4322 4323 ipv6_ifa_notify(0, ifp); 4324 in6_ifa_put(ifp); 4325 goto restart; 4326 } 4327 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4328 !(ifp->flags&IFA_F_TENTATIVE)) { 4329 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4330 ifp->idev->cnf.dad_transmits * 4331 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4332 4333 if (age >= ifp->prefered_lft - regen_advance) { 4334 struct inet6_ifaddr *ifpub = ifp->ifpub; 4335 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4336 next = ifp->tstamp + ifp->prefered_lft * HZ; 4337 if (!ifp->regen_count && ifpub) { 4338 ifp->regen_count++; 4339 in6_ifa_hold(ifp); 4340 in6_ifa_hold(ifpub); 4341 spin_unlock(&ifp->lock); 4342 4343 spin_lock(&ifpub->lock); 4344 ifpub->regen_count = 0; 4345 spin_unlock(&ifpub->lock); 4346 ipv6_create_tempaddr(ifpub, ifp); 4347 in6_ifa_put(ifpub); 4348 in6_ifa_put(ifp); 4349 goto restart; 4350 } 4351 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4352 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4353 spin_unlock(&ifp->lock); 4354 } else { 4355 /* ifp->prefered_lft <= ifp->valid_lft */ 4356 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4357 next = ifp->tstamp + ifp->prefered_lft * HZ; 4358 spin_unlock(&ifp->lock); 4359 } 4360 } 4361 } 4362 4363 next_sec = round_jiffies_up(next); 4364 next_sched = next; 4365 4366 /* If rounded timeout is accurate enough, accept it. */ 4367 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4368 next_sched = next_sec; 4369 4370 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4371 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4372 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4373 4374 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4375 now, next, next_sec, next_sched); 4376 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4377 rcu_read_unlock_bh(); 4378 } 4379 4380 static void addrconf_verify_work(struct work_struct *w) 4381 { 4382 rtnl_lock(); 4383 addrconf_verify_rtnl(); 4384 rtnl_unlock(); 4385 } 4386 4387 static void addrconf_verify(void) 4388 { 4389 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4390 } 4391 4392 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4393 struct in6_addr **peer_pfx) 4394 { 4395 struct in6_addr *pfx = NULL; 4396 4397 *peer_pfx = NULL; 4398 4399 if (addr) 4400 pfx = nla_data(addr); 4401 4402 if (local) { 4403 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4404 *peer_pfx = pfx; 4405 pfx = nla_data(local); 4406 } 4407 4408 return pfx; 4409 } 4410 4411 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4412 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4413 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4414 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4415 [IFA_FLAGS] = { .len = sizeof(u32) }, 4416 }; 4417 4418 static int 4419 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4420 struct netlink_ext_ack *extack) 4421 { 4422 struct net *net = sock_net(skb->sk); 4423 struct ifaddrmsg *ifm; 4424 struct nlattr *tb[IFA_MAX+1]; 4425 struct in6_addr *pfx, *peer_pfx; 4426 u32 ifa_flags; 4427 int err; 4428 4429 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4430 extack); 4431 if (err < 0) 4432 return err; 4433 4434 ifm = nlmsg_data(nlh); 4435 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4436 if (!pfx) 4437 return -EINVAL; 4438 4439 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4440 4441 /* We ignore other flags so far. */ 4442 ifa_flags &= IFA_F_MANAGETEMPADDR; 4443 4444 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4445 ifm->ifa_prefixlen); 4446 } 4447 4448 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4449 u32 prefered_lft, u32 valid_lft) 4450 { 4451 u32 flags; 4452 clock_t expires; 4453 unsigned long timeout; 4454 bool was_managetempaddr; 4455 bool had_prefixroute; 4456 4457 ASSERT_RTNL(); 4458 4459 if (!valid_lft || (prefered_lft > valid_lft)) 4460 return -EINVAL; 4461 4462 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4463 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4464 return -EINVAL; 4465 4466 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4467 if (addrconf_finite_timeout(timeout)) { 4468 expires = jiffies_to_clock_t(timeout * HZ); 4469 valid_lft = timeout; 4470 flags = RTF_EXPIRES; 4471 } else { 4472 expires = 0; 4473 flags = 0; 4474 ifa_flags |= IFA_F_PERMANENT; 4475 } 4476 4477 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4478 if (addrconf_finite_timeout(timeout)) { 4479 if (timeout == 0) 4480 ifa_flags |= IFA_F_DEPRECATED; 4481 prefered_lft = timeout; 4482 } 4483 4484 spin_lock_bh(&ifp->lock); 4485 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4486 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4487 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4488 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4489 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4490 IFA_F_NOPREFIXROUTE); 4491 ifp->flags |= ifa_flags; 4492 ifp->tstamp = jiffies; 4493 ifp->valid_lft = valid_lft; 4494 ifp->prefered_lft = prefered_lft; 4495 4496 spin_unlock_bh(&ifp->lock); 4497 if (!(ifp->flags&IFA_F_TENTATIVE)) 4498 ipv6_ifa_notify(0, ifp); 4499 4500 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4501 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4502 expires, flags); 4503 } else if (had_prefixroute) { 4504 enum cleanup_prefix_rt_t action; 4505 unsigned long rt_expires; 4506 4507 write_lock_bh(&ifp->idev->lock); 4508 action = check_cleanup_prefix_route(ifp, &rt_expires); 4509 write_unlock_bh(&ifp->idev->lock); 4510 4511 if (action != CLEANUP_PREFIX_RT_NOP) { 4512 cleanup_prefix_route(ifp, rt_expires, 4513 action == CLEANUP_PREFIX_RT_DEL); 4514 } 4515 } 4516 4517 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4518 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4519 valid_lft = prefered_lft = 0; 4520 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4521 !was_managetempaddr, jiffies); 4522 } 4523 4524 addrconf_verify_rtnl(); 4525 4526 return 0; 4527 } 4528 4529 static int 4530 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4531 struct netlink_ext_ack *extack) 4532 { 4533 struct net *net = sock_net(skb->sk); 4534 struct ifaddrmsg *ifm; 4535 struct nlattr *tb[IFA_MAX+1]; 4536 struct in6_addr *pfx, *peer_pfx; 4537 struct inet6_ifaddr *ifa; 4538 struct net_device *dev; 4539 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4540 u32 ifa_flags; 4541 int err; 4542 4543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4544 extack); 4545 if (err < 0) 4546 return err; 4547 4548 ifm = nlmsg_data(nlh); 4549 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4550 if (!pfx) 4551 return -EINVAL; 4552 4553 if (tb[IFA_CACHEINFO]) { 4554 struct ifa_cacheinfo *ci; 4555 4556 ci = nla_data(tb[IFA_CACHEINFO]); 4557 valid_lft = ci->ifa_valid; 4558 preferred_lft = ci->ifa_prefered; 4559 } else { 4560 preferred_lft = INFINITY_LIFE_TIME; 4561 valid_lft = INFINITY_LIFE_TIME; 4562 } 4563 4564 dev = __dev_get_by_index(net, ifm->ifa_index); 4565 if (!dev) 4566 return -ENODEV; 4567 4568 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4569 4570 /* We ignore other flags so far. */ 4571 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4572 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4573 4574 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4575 if (!ifa) { 4576 /* 4577 * It would be best to check for !NLM_F_CREATE here but 4578 * userspace already relies on not having to provide this. 4579 */ 4580 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4581 ifm->ifa_prefixlen, ifa_flags, 4582 preferred_lft, valid_lft); 4583 } 4584 4585 if (nlh->nlmsg_flags & NLM_F_EXCL || 4586 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4587 err = -EEXIST; 4588 else 4589 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4590 4591 in6_ifa_put(ifa); 4592 4593 return err; 4594 } 4595 4596 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4597 u8 scope, int ifindex) 4598 { 4599 struct ifaddrmsg *ifm; 4600 4601 ifm = nlmsg_data(nlh); 4602 ifm->ifa_family = AF_INET6; 4603 ifm->ifa_prefixlen = prefixlen; 4604 ifm->ifa_flags = flags; 4605 ifm->ifa_scope = scope; 4606 ifm->ifa_index = ifindex; 4607 } 4608 4609 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4610 unsigned long tstamp, u32 preferred, u32 valid) 4611 { 4612 struct ifa_cacheinfo ci; 4613 4614 ci.cstamp = cstamp_delta(cstamp); 4615 ci.tstamp = cstamp_delta(tstamp); 4616 ci.ifa_prefered = preferred; 4617 ci.ifa_valid = valid; 4618 4619 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4620 } 4621 4622 static inline int rt_scope(int ifa_scope) 4623 { 4624 if (ifa_scope & IFA_HOST) 4625 return RT_SCOPE_HOST; 4626 else if (ifa_scope & IFA_LINK) 4627 return RT_SCOPE_LINK; 4628 else if (ifa_scope & IFA_SITE) 4629 return RT_SCOPE_SITE; 4630 else 4631 return RT_SCOPE_UNIVERSE; 4632 } 4633 4634 static inline int inet6_ifaddr_msgsize(void) 4635 { 4636 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4637 + nla_total_size(16) /* IFA_LOCAL */ 4638 + nla_total_size(16) /* IFA_ADDRESS */ 4639 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4640 + nla_total_size(4) /* IFA_FLAGS */; 4641 } 4642 4643 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4644 u32 portid, u32 seq, int event, unsigned int flags) 4645 { 4646 struct nlmsghdr *nlh; 4647 u32 preferred, valid; 4648 4649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4650 if (!nlh) 4651 return -EMSGSIZE; 4652 4653 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4654 ifa->idev->dev->ifindex); 4655 4656 if (!((ifa->flags&IFA_F_PERMANENT) && 4657 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4658 preferred = ifa->prefered_lft; 4659 valid = ifa->valid_lft; 4660 if (preferred != INFINITY_LIFE_TIME) { 4661 long tval = (jiffies - ifa->tstamp)/HZ; 4662 if (preferred > tval) 4663 preferred -= tval; 4664 else 4665 preferred = 0; 4666 if (valid != INFINITY_LIFE_TIME) { 4667 if (valid > tval) 4668 valid -= tval; 4669 else 4670 valid = 0; 4671 } 4672 } 4673 } else { 4674 preferred = INFINITY_LIFE_TIME; 4675 valid = INFINITY_LIFE_TIME; 4676 } 4677 4678 if (!ipv6_addr_any(&ifa->peer_addr)) { 4679 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4680 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4681 goto error; 4682 } else 4683 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4684 goto error; 4685 4686 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4687 goto error; 4688 4689 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4690 goto error; 4691 4692 nlmsg_end(skb, nlh); 4693 return 0; 4694 4695 error: 4696 nlmsg_cancel(skb, nlh); 4697 return -EMSGSIZE; 4698 } 4699 4700 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4701 u32 portid, u32 seq, int event, u16 flags) 4702 { 4703 struct nlmsghdr *nlh; 4704 u8 scope = RT_SCOPE_UNIVERSE; 4705 int ifindex = ifmca->idev->dev->ifindex; 4706 4707 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4708 scope = RT_SCOPE_SITE; 4709 4710 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4711 if (!nlh) 4712 return -EMSGSIZE; 4713 4714 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4715 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4716 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4717 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4718 nlmsg_cancel(skb, nlh); 4719 return -EMSGSIZE; 4720 } 4721 4722 nlmsg_end(skb, nlh); 4723 return 0; 4724 } 4725 4726 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4727 u32 portid, u32 seq, int event, unsigned int flags) 4728 { 4729 struct nlmsghdr *nlh; 4730 u8 scope = RT_SCOPE_UNIVERSE; 4731 int ifindex = ifaca->aca_idev->dev->ifindex; 4732 4733 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4734 scope = RT_SCOPE_SITE; 4735 4736 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4737 if (!nlh) 4738 return -EMSGSIZE; 4739 4740 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4741 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4742 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4743 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4744 nlmsg_cancel(skb, nlh); 4745 return -EMSGSIZE; 4746 } 4747 4748 nlmsg_end(skb, nlh); 4749 return 0; 4750 } 4751 4752 enum addr_type_t { 4753 UNICAST_ADDR, 4754 MULTICAST_ADDR, 4755 ANYCAST_ADDR, 4756 }; 4757 4758 /* called with rcu_read_lock() */ 4759 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4760 struct netlink_callback *cb, enum addr_type_t type, 4761 int s_ip_idx, int *p_ip_idx) 4762 { 4763 struct ifmcaddr6 *ifmca; 4764 struct ifacaddr6 *ifaca; 4765 int err = 1; 4766 int ip_idx = *p_ip_idx; 4767 4768 read_lock_bh(&idev->lock); 4769 switch (type) { 4770 case UNICAST_ADDR: { 4771 struct inet6_ifaddr *ifa; 4772 4773 /* unicast address incl. temp addr */ 4774 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4775 if (++ip_idx < s_ip_idx) 4776 continue; 4777 err = inet6_fill_ifaddr(skb, ifa, 4778 NETLINK_CB(cb->skb).portid, 4779 cb->nlh->nlmsg_seq, 4780 RTM_NEWADDR, 4781 NLM_F_MULTI); 4782 if (err < 0) 4783 break; 4784 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4785 } 4786 break; 4787 } 4788 case MULTICAST_ADDR: 4789 /* multicast address */ 4790 for (ifmca = idev->mc_list; ifmca; 4791 ifmca = ifmca->next, ip_idx++) { 4792 if (ip_idx < s_ip_idx) 4793 continue; 4794 err = inet6_fill_ifmcaddr(skb, ifmca, 4795 NETLINK_CB(cb->skb).portid, 4796 cb->nlh->nlmsg_seq, 4797 RTM_GETMULTICAST, 4798 NLM_F_MULTI); 4799 if (err < 0) 4800 break; 4801 } 4802 break; 4803 case ANYCAST_ADDR: 4804 /* anycast address */ 4805 for (ifaca = idev->ac_list; ifaca; 4806 ifaca = ifaca->aca_next, ip_idx++) { 4807 if (ip_idx < s_ip_idx) 4808 continue; 4809 err = inet6_fill_ifacaddr(skb, ifaca, 4810 NETLINK_CB(cb->skb).portid, 4811 cb->nlh->nlmsg_seq, 4812 RTM_GETANYCAST, 4813 NLM_F_MULTI); 4814 if (err < 0) 4815 break; 4816 } 4817 break; 4818 default: 4819 break; 4820 } 4821 read_unlock_bh(&idev->lock); 4822 *p_ip_idx = ip_idx; 4823 return err; 4824 } 4825 4826 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4827 enum addr_type_t type) 4828 { 4829 struct net *net = sock_net(skb->sk); 4830 int h, s_h; 4831 int idx, ip_idx; 4832 int s_idx, s_ip_idx; 4833 struct net_device *dev; 4834 struct inet6_dev *idev; 4835 struct hlist_head *head; 4836 4837 s_h = cb->args[0]; 4838 s_idx = idx = cb->args[1]; 4839 s_ip_idx = ip_idx = cb->args[2]; 4840 4841 rcu_read_lock(); 4842 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4843 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4844 idx = 0; 4845 head = &net->dev_index_head[h]; 4846 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4847 if (idx < s_idx) 4848 goto cont; 4849 if (h > s_h || idx > s_idx) 4850 s_ip_idx = 0; 4851 ip_idx = 0; 4852 idev = __in6_dev_get(dev); 4853 if (!idev) 4854 goto cont; 4855 4856 if (in6_dump_addrs(idev, skb, cb, type, 4857 s_ip_idx, &ip_idx) < 0) 4858 goto done; 4859 cont: 4860 idx++; 4861 } 4862 } 4863 done: 4864 rcu_read_unlock(); 4865 cb->args[0] = h; 4866 cb->args[1] = idx; 4867 cb->args[2] = ip_idx; 4868 4869 return skb->len; 4870 } 4871 4872 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4873 { 4874 enum addr_type_t type = UNICAST_ADDR; 4875 4876 return inet6_dump_addr(skb, cb, type); 4877 } 4878 4879 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4880 { 4881 enum addr_type_t type = MULTICAST_ADDR; 4882 4883 return inet6_dump_addr(skb, cb, type); 4884 } 4885 4886 4887 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4888 { 4889 enum addr_type_t type = ANYCAST_ADDR; 4890 4891 return inet6_dump_addr(skb, cb, type); 4892 } 4893 4894 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4895 struct netlink_ext_ack *extack) 4896 { 4897 struct net *net = sock_net(in_skb->sk); 4898 struct ifaddrmsg *ifm; 4899 struct nlattr *tb[IFA_MAX+1]; 4900 struct in6_addr *addr = NULL, *peer; 4901 struct net_device *dev = NULL; 4902 struct inet6_ifaddr *ifa; 4903 struct sk_buff *skb; 4904 int err; 4905 4906 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4907 extack); 4908 if (err < 0) 4909 goto errout; 4910 4911 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4912 if (!addr) { 4913 err = -EINVAL; 4914 goto errout; 4915 } 4916 4917 ifm = nlmsg_data(nlh); 4918 if (ifm->ifa_index) 4919 dev = __dev_get_by_index(net, ifm->ifa_index); 4920 4921 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4922 if (!ifa) { 4923 err = -EADDRNOTAVAIL; 4924 goto errout; 4925 } 4926 4927 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4928 if (!skb) { 4929 err = -ENOBUFS; 4930 goto errout_ifa; 4931 } 4932 4933 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4934 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4935 if (err < 0) { 4936 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4937 WARN_ON(err == -EMSGSIZE); 4938 kfree_skb(skb); 4939 goto errout_ifa; 4940 } 4941 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4942 errout_ifa: 4943 in6_ifa_put(ifa); 4944 errout: 4945 return err; 4946 } 4947 4948 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4949 { 4950 struct sk_buff *skb; 4951 struct net *net = dev_net(ifa->idev->dev); 4952 int err = -ENOBUFS; 4953 4954 /* Don't send DELADDR notification for TENTATIVE address, 4955 * since NEWADDR notification is sent only after removing 4956 * TENTATIVE flag, if DAD has not failed. 4957 */ 4958 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4959 event == RTM_DELADDR) 4960 return; 4961 4962 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4963 if (!skb) 4964 goto errout; 4965 4966 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4967 if (err < 0) { 4968 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4969 WARN_ON(err == -EMSGSIZE); 4970 kfree_skb(skb); 4971 goto errout; 4972 } 4973 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4974 return; 4975 errout: 4976 if (err < 0) 4977 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4978 } 4979 4980 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4981 __s32 *array, int bytes) 4982 { 4983 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4984 4985 memset(array, 0, bytes); 4986 array[DEVCONF_FORWARDING] = cnf->forwarding; 4987 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4988 array[DEVCONF_MTU6] = cnf->mtu6; 4989 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4990 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4991 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4992 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4993 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4994 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4995 jiffies_to_msecs(cnf->rtr_solicit_interval); 4996 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4997 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4998 array[DEVCONF_RTR_SOLICIT_DELAY] = 4999 jiffies_to_msecs(cnf->rtr_solicit_delay); 5000 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5001 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5002 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5003 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5004 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5005 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5006 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5007 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5008 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5009 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5010 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5011 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5012 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5013 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5014 #ifdef CONFIG_IPV6_ROUTER_PREF 5015 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5016 array[DEVCONF_RTR_PROBE_INTERVAL] = 5017 jiffies_to_msecs(cnf->rtr_probe_interval); 5018 #ifdef CONFIG_IPV6_ROUTE_INFO 5019 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5020 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5021 #endif 5022 #endif 5023 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5024 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5025 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5026 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5027 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5028 #endif 5029 #ifdef CONFIG_IPV6_MROUTE 5030 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5031 #endif 5032 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5033 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5034 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5035 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5036 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5037 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5038 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5039 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5040 /* we omit DEVCONF_STABLE_SECRET for now */ 5041 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5042 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5043 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5044 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5045 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5046 #ifdef CONFIG_IPV6_SEG6_HMAC 5047 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5048 #endif 5049 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5050 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5051 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5052 } 5053 5054 static inline size_t inet6_ifla6_size(void) 5055 { 5056 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5057 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5058 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5059 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5060 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5061 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5062 } 5063 5064 static inline size_t inet6_if_nlmsg_size(void) 5065 { 5066 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5067 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5068 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5069 + nla_total_size(4) /* IFLA_MTU */ 5070 + nla_total_size(4) /* IFLA_LINK */ 5071 + nla_total_size(1) /* IFLA_OPERSTATE */ 5072 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5073 } 5074 5075 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5076 int bytes) 5077 { 5078 int i; 5079 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5080 BUG_ON(pad < 0); 5081 5082 /* Use put_unaligned() because stats may not be aligned for u64. */ 5083 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5084 for (i = 1; i < ICMP6_MIB_MAX; i++) 5085 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5086 5087 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5088 } 5089 5090 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5091 int bytes, size_t syncpoff) 5092 { 5093 int i, c; 5094 u64 buff[IPSTATS_MIB_MAX]; 5095 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5096 5097 BUG_ON(pad < 0); 5098 5099 memset(buff, 0, sizeof(buff)); 5100 buff[0] = IPSTATS_MIB_MAX; 5101 5102 for_each_possible_cpu(c) { 5103 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5104 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5105 } 5106 5107 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5108 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5109 } 5110 5111 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5112 int bytes) 5113 { 5114 switch (attrtype) { 5115 case IFLA_INET6_STATS: 5116 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5117 offsetof(struct ipstats_mib, syncp)); 5118 break; 5119 case IFLA_INET6_ICMP6STATS: 5120 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5121 break; 5122 } 5123 } 5124 5125 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5126 u32 ext_filter_mask) 5127 { 5128 struct nlattr *nla; 5129 struct ifla_cacheinfo ci; 5130 5131 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5132 goto nla_put_failure; 5133 ci.max_reasm_len = IPV6_MAXPLEN; 5134 ci.tstamp = cstamp_delta(idev->tstamp); 5135 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5136 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5137 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5138 goto nla_put_failure; 5139 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5140 if (!nla) 5141 goto nla_put_failure; 5142 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5143 5144 /* XXX - MC not implemented */ 5145 5146 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5147 return 0; 5148 5149 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5150 if (!nla) 5151 goto nla_put_failure; 5152 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5153 5154 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5155 if (!nla) 5156 goto nla_put_failure; 5157 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5158 5159 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5160 if (!nla) 5161 goto nla_put_failure; 5162 5163 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5164 goto nla_put_failure; 5165 5166 read_lock_bh(&idev->lock); 5167 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5168 read_unlock_bh(&idev->lock); 5169 5170 return 0; 5171 5172 nla_put_failure: 5173 return -EMSGSIZE; 5174 } 5175 5176 static size_t inet6_get_link_af_size(const struct net_device *dev, 5177 u32 ext_filter_mask) 5178 { 5179 if (!__in6_dev_get(dev)) 5180 return 0; 5181 5182 return inet6_ifla6_size(); 5183 } 5184 5185 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5186 u32 ext_filter_mask) 5187 { 5188 struct inet6_dev *idev = __in6_dev_get(dev); 5189 5190 if (!idev) 5191 return -ENODATA; 5192 5193 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5194 return -EMSGSIZE; 5195 5196 return 0; 5197 } 5198 5199 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5200 { 5201 struct inet6_ifaddr *ifp; 5202 struct net_device *dev = idev->dev; 5203 bool clear_token, update_rs = false; 5204 struct in6_addr ll_addr; 5205 5206 ASSERT_RTNL(); 5207 5208 if (!token) 5209 return -EINVAL; 5210 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5211 return -EINVAL; 5212 if (!ipv6_accept_ra(idev)) 5213 return -EINVAL; 5214 if (idev->cnf.rtr_solicits == 0) 5215 return -EINVAL; 5216 5217 write_lock_bh(&idev->lock); 5218 5219 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5220 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5221 5222 write_unlock_bh(&idev->lock); 5223 5224 clear_token = ipv6_addr_any(token); 5225 if (clear_token) 5226 goto update_lft; 5227 5228 if (!idev->dead && (idev->if_flags & IF_READY) && 5229 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5230 IFA_F_OPTIMISTIC)) { 5231 /* If we're not ready, then normal ifup will take care 5232 * of this. Otherwise, we need to request our rs here. 5233 */ 5234 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5235 update_rs = true; 5236 } 5237 5238 update_lft: 5239 write_lock_bh(&idev->lock); 5240 5241 if (update_rs) { 5242 idev->if_flags |= IF_RS_SENT; 5243 idev->rs_interval = rfc3315_s14_backoff_init( 5244 idev->cnf.rtr_solicit_interval); 5245 idev->rs_probes = 1; 5246 addrconf_mod_rs_timer(idev, idev->rs_interval); 5247 } 5248 5249 /* Well, that's kinda nasty ... */ 5250 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5251 spin_lock(&ifp->lock); 5252 if (ifp->tokenized) { 5253 ifp->valid_lft = 0; 5254 ifp->prefered_lft = 0; 5255 } 5256 spin_unlock(&ifp->lock); 5257 } 5258 5259 write_unlock_bh(&idev->lock); 5260 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5261 addrconf_verify_rtnl(); 5262 return 0; 5263 } 5264 5265 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5266 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5267 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5268 }; 5269 5270 static int inet6_validate_link_af(const struct net_device *dev, 5271 const struct nlattr *nla) 5272 { 5273 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5274 5275 if (dev && !__in6_dev_get(dev)) 5276 return -EAFNOSUPPORT; 5277 5278 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5279 NULL); 5280 } 5281 5282 static int check_addr_gen_mode(int mode) 5283 { 5284 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5285 mode != IN6_ADDR_GEN_MODE_NONE && 5286 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5287 mode != IN6_ADDR_GEN_MODE_RANDOM) 5288 return -EINVAL; 5289 return 1; 5290 } 5291 5292 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5293 int mode) 5294 { 5295 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5296 !idev->cnf.stable_secret.initialized && 5297 !net->ipv6.devconf_dflt->stable_secret.initialized) 5298 return -EINVAL; 5299 return 1; 5300 } 5301 5302 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5303 { 5304 int err = -EINVAL; 5305 struct inet6_dev *idev = __in6_dev_get(dev); 5306 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5307 5308 if (!idev) 5309 return -EAFNOSUPPORT; 5310 5311 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5312 BUG(); 5313 5314 if (tb[IFLA_INET6_TOKEN]) { 5315 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5316 if (err) 5317 return err; 5318 } 5319 5320 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5321 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5322 5323 if (check_addr_gen_mode(mode) < 0 || 5324 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5325 return -EINVAL; 5326 5327 idev->cnf.addr_gen_mode = mode; 5328 err = 0; 5329 } 5330 5331 return err; 5332 } 5333 5334 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5335 u32 portid, u32 seq, int event, unsigned int flags) 5336 { 5337 struct net_device *dev = idev->dev; 5338 struct ifinfomsg *hdr; 5339 struct nlmsghdr *nlh; 5340 void *protoinfo; 5341 5342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5343 if (!nlh) 5344 return -EMSGSIZE; 5345 5346 hdr = nlmsg_data(nlh); 5347 hdr->ifi_family = AF_INET6; 5348 hdr->__ifi_pad = 0; 5349 hdr->ifi_type = dev->type; 5350 hdr->ifi_index = dev->ifindex; 5351 hdr->ifi_flags = dev_get_flags(dev); 5352 hdr->ifi_change = 0; 5353 5354 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5355 (dev->addr_len && 5356 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5357 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5358 (dev->ifindex != dev_get_iflink(dev) && 5359 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5360 nla_put_u8(skb, IFLA_OPERSTATE, 5361 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5362 goto nla_put_failure; 5363 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5364 if (!protoinfo) 5365 goto nla_put_failure; 5366 5367 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5368 goto nla_put_failure; 5369 5370 nla_nest_end(skb, protoinfo); 5371 nlmsg_end(skb, nlh); 5372 return 0; 5373 5374 nla_put_failure: 5375 nlmsg_cancel(skb, nlh); 5376 return -EMSGSIZE; 5377 } 5378 5379 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5380 { 5381 struct net *net = sock_net(skb->sk); 5382 int h, s_h; 5383 int idx = 0, s_idx; 5384 struct net_device *dev; 5385 struct inet6_dev *idev; 5386 struct hlist_head *head; 5387 5388 s_h = cb->args[0]; 5389 s_idx = cb->args[1]; 5390 5391 rcu_read_lock(); 5392 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5393 idx = 0; 5394 head = &net->dev_index_head[h]; 5395 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5396 if (idx < s_idx) 5397 goto cont; 5398 idev = __in6_dev_get(dev); 5399 if (!idev) 5400 goto cont; 5401 if (inet6_fill_ifinfo(skb, idev, 5402 NETLINK_CB(cb->skb).portid, 5403 cb->nlh->nlmsg_seq, 5404 RTM_NEWLINK, NLM_F_MULTI) < 0) 5405 goto out; 5406 cont: 5407 idx++; 5408 } 5409 } 5410 out: 5411 rcu_read_unlock(); 5412 cb->args[1] = idx; 5413 cb->args[0] = h; 5414 5415 return skb->len; 5416 } 5417 5418 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5419 { 5420 struct sk_buff *skb; 5421 struct net *net = dev_net(idev->dev); 5422 int err = -ENOBUFS; 5423 5424 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5425 if (!skb) 5426 goto errout; 5427 5428 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5429 if (err < 0) { 5430 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5431 WARN_ON(err == -EMSGSIZE); 5432 kfree_skb(skb); 5433 goto errout; 5434 } 5435 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5436 return; 5437 errout: 5438 if (err < 0) 5439 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5440 } 5441 5442 static inline size_t inet6_prefix_nlmsg_size(void) 5443 { 5444 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5445 + nla_total_size(sizeof(struct in6_addr)) 5446 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5447 } 5448 5449 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5450 struct prefix_info *pinfo, u32 portid, u32 seq, 5451 int event, unsigned int flags) 5452 { 5453 struct prefixmsg *pmsg; 5454 struct nlmsghdr *nlh; 5455 struct prefix_cacheinfo ci; 5456 5457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5458 if (!nlh) 5459 return -EMSGSIZE; 5460 5461 pmsg = nlmsg_data(nlh); 5462 pmsg->prefix_family = AF_INET6; 5463 pmsg->prefix_pad1 = 0; 5464 pmsg->prefix_pad2 = 0; 5465 pmsg->prefix_ifindex = idev->dev->ifindex; 5466 pmsg->prefix_len = pinfo->prefix_len; 5467 pmsg->prefix_type = pinfo->type; 5468 pmsg->prefix_pad3 = 0; 5469 pmsg->prefix_flags = 0; 5470 if (pinfo->onlink) 5471 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5472 if (pinfo->autoconf) 5473 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5474 5475 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5476 goto nla_put_failure; 5477 ci.preferred_time = ntohl(pinfo->prefered); 5478 ci.valid_time = ntohl(pinfo->valid); 5479 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5480 goto nla_put_failure; 5481 nlmsg_end(skb, nlh); 5482 return 0; 5483 5484 nla_put_failure: 5485 nlmsg_cancel(skb, nlh); 5486 return -EMSGSIZE; 5487 } 5488 5489 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5490 struct prefix_info *pinfo) 5491 { 5492 struct sk_buff *skb; 5493 struct net *net = dev_net(idev->dev); 5494 int err = -ENOBUFS; 5495 5496 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5497 if (!skb) 5498 goto errout; 5499 5500 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5501 if (err < 0) { 5502 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5503 WARN_ON(err == -EMSGSIZE); 5504 kfree_skb(skb); 5505 goto errout; 5506 } 5507 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5508 return; 5509 errout: 5510 if (err < 0) 5511 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5512 } 5513 5514 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5515 { 5516 struct net *net = dev_net(ifp->idev->dev); 5517 5518 if (event) 5519 ASSERT_RTNL(); 5520 5521 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5522 5523 switch (event) { 5524 case RTM_NEWADDR: 5525 /* 5526 * If the address was optimistic 5527 * we inserted the route at the start of 5528 * our DAD process, so we don't need 5529 * to do it again 5530 */ 5531 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5532 ip6_ins_rt(ifp->rt); 5533 if (ifp->idev->cnf.forwarding) 5534 addrconf_join_anycast(ifp); 5535 if (!ipv6_addr_any(&ifp->peer_addr)) 5536 addrconf_prefix_route(&ifp->peer_addr, 128, 5537 ifp->idev->dev, 0, 0); 5538 break; 5539 case RTM_DELADDR: 5540 if (ifp->idev->cnf.forwarding) 5541 addrconf_leave_anycast(ifp); 5542 addrconf_leave_solict(ifp->idev, &ifp->addr); 5543 if (!ipv6_addr_any(&ifp->peer_addr)) { 5544 struct rt6_info *rt; 5545 5546 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5547 ifp->idev->dev, 0, 0); 5548 if (rt) 5549 ip6_del_rt(rt); 5550 } 5551 if (ifp->rt) { 5552 if (dst_hold_safe(&ifp->rt->dst)) 5553 ip6_del_rt(ifp->rt); 5554 } 5555 rt_genid_bump_ipv6(net); 5556 break; 5557 } 5558 atomic_inc(&net->ipv6.dev_addr_genid); 5559 } 5560 5561 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5562 { 5563 rcu_read_lock_bh(); 5564 if (likely(ifp->idev->dead == 0)) 5565 __ipv6_ifa_notify(event, ifp); 5566 rcu_read_unlock_bh(); 5567 } 5568 5569 #ifdef CONFIG_SYSCTL 5570 5571 static 5572 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5573 void __user *buffer, size_t *lenp, loff_t *ppos) 5574 { 5575 int *valp = ctl->data; 5576 int val = *valp; 5577 loff_t pos = *ppos; 5578 struct ctl_table lctl; 5579 int ret; 5580 5581 /* 5582 * ctl->data points to idev->cnf.forwarding, we should 5583 * not modify it until we get the rtnl lock. 5584 */ 5585 lctl = *ctl; 5586 lctl.data = &val; 5587 5588 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5589 5590 if (write) 5591 ret = addrconf_fixup_forwarding(ctl, valp, val); 5592 if (ret) 5593 *ppos = pos; 5594 return ret; 5595 } 5596 5597 static 5598 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5599 void __user *buffer, size_t *lenp, loff_t *ppos) 5600 { 5601 struct inet6_dev *idev = ctl->extra1; 5602 int min_mtu = IPV6_MIN_MTU; 5603 struct ctl_table lctl; 5604 5605 lctl = *ctl; 5606 lctl.extra1 = &min_mtu; 5607 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5608 5609 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5610 } 5611 5612 static void dev_disable_change(struct inet6_dev *idev) 5613 { 5614 struct netdev_notifier_info info; 5615 5616 if (!idev || !idev->dev) 5617 return; 5618 5619 netdev_notifier_info_init(&info, idev->dev); 5620 if (idev->cnf.disable_ipv6) 5621 addrconf_notify(NULL, NETDEV_DOWN, &info); 5622 else 5623 addrconf_notify(NULL, NETDEV_UP, &info); 5624 } 5625 5626 static void addrconf_disable_change(struct net *net, __s32 newf) 5627 { 5628 struct net_device *dev; 5629 struct inet6_dev *idev; 5630 5631 for_each_netdev(net, dev) { 5632 idev = __in6_dev_get(dev); 5633 if (idev) { 5634 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5635 idev->cnf.disable_ipv6 = newf; 5636 if (changed) 5637 dev_disable_change(idev); 5638 } 5639 } 5640 } 5641 5642 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5643 { 5644 struct net *net; 5645 int old; 5646 5647 if (!rtnl_trylock()) 5648 return restart_syscall(); 5649 5650 net = (struct net *)table->extra2; 5651 old = *p; 5652 *p = newf; 5653 5654 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5655 rtnl_unlock(); 5656 return 0; 5657 } 5658 5659 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5660 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5661 addrconf_disable_change(net, newf); 5662 } else if ((!newf) ^ (!old)) 5663 dev_disable_change((struct inet6_dev *)table->extra1); 5664 5665 rtnl_unlock(); 5666 return 0; 5667 } 5668 5669 static 5670 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5671 void __user *buffer, size_t *lenp, loff_t *ppos) 5672 { 5673 int *valp = ctl->data; 5674 int val = *valp; 5675 loff_t pos = *ppos; 5676 struct ctl_table lctl; 5677 int ret; 5678 5679 /* 5680 * ctl->data points to idev->cnf.disable_ipv6, we should 5681 * not modify it until we get the rtnl lock. 5682 */ 5683 lctl = *ctl; 5684 lctl.data = &val; 5685 5686 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5687 5688 if (write) 5689 ret = addrconf_disable_ipv6(ctl, valp, val); 5690 if (ret) 5691 *ppos = pos; 5692 return ret; 5693 } 5694 5695 static 5696 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5697 void __user *buffer, size_t *lenp, loff_t *ppos) 5698 { 5699 int *valp = ctl->data; 5700 int ret; 5701 int old, new; 5702 5703 old = *valp; 5704 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5705 new = *valp; 5706 5707 if (write && old != new) { 5708 struct net *net = ctl->extra2; 5709 5710 if (!rtnl_trylock()) 5711 return restart_syscall(); 5712 5713 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5714 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5715 NETCONFA_PROXY_NEIGH, 5716 NETCONFA_IFINDEX_DEFAULT, 5717 net->ipv6.devconf_dflt); 5718 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5719 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5720 NETCONFA_PROXY_NEIGH, 5721 NETCONFA_IFINDEX_ALL, 5722 net->ipv6.devconf_all); 5723 else { 5724 struct inet6_dev *idev = ctl->extra1; 5725 5726 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5727 NETCONFA_PROXY_NEIGH, 5728 idev->dev->ifindex, 5729 &idev->cnf); 5730 } 5731 rtnl_unlock(); 5732 } 5733 5734 return ret; 5735 } 5736 5737 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5738 void __user *buffer, size_t *lenp, 5739 loff_t *ppos) 5740 { 5741 int ret = 0; 5742 int new_val; 5743 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5744 struct net *net = (struct net *)ctl->extra2; 5745 5746 if (!rtnl_trylock()) 5747 return restart_syscall(); 5748 5749 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5750 5751 if (write) { 5752 new_val = *((int *)ctl->data); 5753 5754 if (check_addr_gen_mode(new_val) < 0) { 5755 ret = -EINVAL; 5756 goto out; 5757 } 5758 5759 /* request for default */ 5760 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5761 ipv6_devconf_dflt.addr_gen_mode = new_val; 5762 5763 /* request for individual net device */ 5764 } else { 5765 if (!idev) 5766 goto out; 5767 5768 if (check_stable_privacy(idev, net, new_val) < 0) { 5769 ret = -EINVAL; 5770 goto out; 5771 } 5772 5773 if (idev->cnf.addr_gen_mode != new_val) { 5774 idev->cnf.addr_gen_mode = new_val; 5775 addrconf_dev_config(idev->dev); 5776 } 5777 } 5778 } 5779 5780 out: 5781 rtnl_unlock(); 5782 5783 return ret; 5784 } 5785 5786 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5787 void __user *buffer, size_t *lenp, 5788 loff_t *ppos) 5789 { 5790 int err; 5791 struct in6_addr addr; 5792 char str[IPV6_MAX_STRLEN]; 5793 struct ctl_table lctl = *ctl; 5794 struct net *net = ctl->extra2; 5795 struct ipv6_stable_secret *secret = ctl->data; 5796 5797 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5798 return -EIO; 5799 5800 lctl.maxlen = IPV6_MAX_STRLEN; 5801 lctl.data = str; 5802 5803 if (!rtnl_trylock()) 5804 return restart_syscall(); 5805 5806 if (!write && !secret->initialized) { 5807 err = -EIO; 5808 goto out; 5809 } 5810 5811 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5812 if (err >= sizeof(str)) { 5813 err = -EIO; 5814 goto out; 5815 } 5816 5817 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5818 if (err || !write) 5819 goto out; 5820 5821 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5822 err = -EIO; 5823 goto out; 5824 } 5825 5826 secret->initialized = true; 5827 secret->secret = addr; 5828 5829 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5830 struct net_device *dev; 5831 5832 for_each_netdev(net, dev) { 5833 struct inet6_dev *idev = __in6_dev_get(dev); 5834 5835 if (idev) { 5836 idev->cnf.addr_gen_mode = 5837 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5838 } 5839 } 5840 } else { 5841 struct inet6_dev *idev = ctl->extra1; 5842 5843 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5844 } 5845 5846 out: 5847 rtnl_unlock(); 5848 5849 return err; 5850 } 5851 5852 static 5853 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5854 int write, 5855 void __user *buffer, 5856 size_t *lenp, 5857 loff_t *ppos) 5858 { 5859 int *valp = ctl->data; 5860 int val = *valp; 5861 loff_t pos = *ppos; 5862 struct ctl_table lctl; 5863 int ret; 5864 5865 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5866 * we should not modify it until we get the rtnl lock. 5867 */ 5868 lctl = *ctl; 5869 lctl.data = &val; 5870 5871 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5872 5873 if (write) 5874 ret = addrconf_fixup_linkdown(ctl, valp, val); 5875 if (ret) 5876 *ppos = pos; 5877 return ret; 5878 } 5879 5880 static 5881 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5882 { 5883 if (rt) { 5884 if (action) 5885 rt->dst.flags |= DST_NOPOLICY; 5886 else 5887 rt->dst.flags &= ~DST_NOPOLICY; 5888 } 5889 } 5890 5891 static 5892 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5893 { 5894 struct inet6_ifaddr *ifa; 5895 5896 read_lock_bh(&idev->lock); 5897 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5898 spin_lock(&ifa->lock); 5899 if (ifa->rt) { 5900 struct rt6_info *rt = ifa->rt; 5901 struct fib6_table *table = rt->rt6i_table; 5902 int cpu; 5903 5904 read_lock(&table->tb6_lock); 5905 addrconf_set_nopolicy(ifa->rt, val); 5906 if (rt->rt6i_pcpu) { 5907 for_each_possible_cpu(cpu) { 5908 struct rt6_info **rtp; 5909 5910 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5911 addrconf_set_nopolicy(*rtp, val); 5912 } 5913 } 5914 read_unlock(&table->tb6_lock); 5915 } 5916 spin_unlock(&ifa->lock); 5917 } 5918 read_unlock_bh(&idev->lock); 5919 } 5920 5921 static 5922 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5923 { 5924 struct inet6_dev *idev; 5925 struct net *net; 5926 5927 if (!rtnl_trylock()) 5928 return restart_syscall(); 5929 5930 *valp = val; 5931 5932 net = (struct net *)ctl->extra2; 5933 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5934 rtnl_unlock(); 5935 return 0; 5936 } 5937 5938 if (valp == &net->ipv6.devconf_all->disable_policy) { 5939 struct net_device *dev; 5940 5941 for_each_netdev(net, dev) { 5942 idev = __in6_dev_get(dev); 5943 if (idev) 5944 addrconf_disable_policy_idev(idev, val); 5945 } 5946 } else { 5947 idev = (struct inet6_dev *)ctl->extra1; 5948 addrconf_disable_policy_idev(idev, val); 5949 } 5950 5951 rtnl_unlock(); 5952 return 0; 5953 } 5954 5955 static 5956 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5957 void __user *buffer, size_t *lenp, 5958 loff_t *ppos) 5959 { 5960 int *valp = ctl->data; 5961 int val = *valp; 5962 loff_t pos = *ppos; 5963 struct ctl_table lctl; 5964 int ret; 5965 5966 lctl = *ctl; 5967 lctl.data = &val; 5968 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5969 5970 if (write && (*valp != val)) 5971 ret = addrconf_disable_policy(ctl, valp, val); 5972 5973 if (ret) 5974 *ppos = pos; 5975 5976 return ret; 5977 } 5978 5979 static int minus_one = -1; 5980 static const int one = 1; 5981 static const int two_five_five = 255; 5982 5983 static const struct ctl_table addrconf_sysctl[] = { 5984 { 5985 .procname = "forwarding", 5986 .data = &ipv6_devconf.forwarding, 5987 .maxlen = sizeof(int), 5988 .mode = 0644, 5989 .proc_handler = addrconf_sysctl_forward, 5990 }, 5991 { 5992 .procname = "hop_limit", 5993 .data = &ipv6_devconf.hop_limit, 5994 .maxlen = sizeof(int), 5995 .mode = 0644, 5996 .proc_handler = proc_dointvec_minmax, 5997 .extra1 = (void *)&one, 5998 .extra2 = (void *)&two_five_five, 5999 }, 6000 { 6001 .procname = "mtu", 6002 .data = &ipv6_devconf.mtu6, 6003 .maxlen = sizeof(int), 6004 .mode = 0644, 6005 .proc_handler = addrconf_sysctl_mtu, 6006 }, 6007 { 6008 .procname = "accept_ra", 6009 .data = &ipv6_devconf.accept_ra, 6010 .maxlen = sizeof(int), 6011 .mode = 0644, 6012 .proc_handler = proc_dointvec, 6013 }, 6014 { 6015 .procname = "accept_redirects", 6016 .data = &ipv6_devconf.accept_redirects, 6017 .maxlen = sizeof(int), 6018 .mode = 0644, 6019 .proc_handler = proc_dointvec, 6020 }, 6021 { 6022 .procname = "autoconf", 6023 .data = &ipv6_devconf.autoconf, 6024 .maxlen = sizeof(int), 6025 .mode = 0644, 6026 .proc_handler = proc_dointvec, 6027 }, 6028 { 6029 .procname = "dad_transmits", 6030 .data = &ipv6_devconf.dad_transmits, 6031 .maxlen = sizeof(int), 6032 .mode = 0644, 6033 .proc_handler = proc_dointvec, 6034 }, 6035 { 6036 .procname = "router_solicitations", 6037 .data = &ipv6_devconf.rtr_solicits, 6038 .maxlen = sizeof(int), 6039 .mode = 0644, 6040 .proc_handler = proc_dointvec_minmax, 6041 .extra1 = &minus_one, 6042 }, 6043 { 6044 .procname = "router_solicitation_interval", 6045 .data = &ipv6_devconf.rtr_solicit_interval, 6046 .maxlen = sizeof(int), 6047 .mode = 0644, 6048 .proc_handler = proc_dointvec_jiffies, 6049 }, 6050 { 6051 .procname = "router_solicitation_max_interval", 6052 .data = &ipv6_devconf.rtr_solicit_max_interval, 6053 .maxlen = sizeof(int), 6054 .mode = 0644, 6055 .proc_handler = proc_dointvec_jiffies, 6056 }, 6057 { 6058 .procname = "router_solicitation_delay", 6059 .data = &ipv6_devconf.rtr_solicit_delay, 6060 .maxlen = sizeof(int), 6061 .mode = 0644, 6062 .proc_handler = proc_dointvec_jiffies, 6063 }, 6064 { 6065 .procname = "force_mld_version", 6066 .data = &ipv6_devconf.force_mld_version, 6067 .maxlen = sizeof(int), 6068 .mode = 0644, 6069 .proc_handler = proc_dointvec, 6070 }, 6071 { 6072 .procname = "mldv1_unsolicited_report_interval", 6073 .data = 6074 &ipv6_devconf.mldv1_unsolicited_report_interval, 6075 .maxlen = sizeof(int), 6076 .mode = 0644, 6077 .proc_handler = proc_dointvec_ms_jiffies, 6078 }, 6079 { 6080 .procname = "mldv2_unsolicited_report_interval", 6081 .data = 6082 &ipv6_devconf.mldv2_unsolicited_report_interval, 6083 .maxlen = sizeof(int), 6084 .mode = 0644, 6085 .proc_handler = proc_dointvec_ms_jiffies, 6086 }, 6087 { 6088 .procname = "use_tempaddr", 6089 .data = &ipv6_devconf.use_tempaddr, 6090 .maxlen = sizeof(int), 6091 .mode = 0644, 6092 .proc_handler = proc_dointvec, 6093 }, 6094 { 6095 .procname = "temp_valid_lft", 6096 .data = &ipv6_devconf.temp_valid_lft, 6097 .maxlen = sizeof(int), 6098 .mode = 0644, 6099 .proc_handler = proc_dointvec, 6100 }, 6101 { 6102 .procname = "temp_prefered_lft", 6103 .data = &ipv6_devconf.temp_prefered_lft, 6104 .maxlen = sizeof(int), 6105 .mode = 0644, 6106 .proc_handler = proc_dointvec, 6107 }, 6108 { 6109 .procname = "regen_max_retry", 6110 .data = &ipv6_devconf.regen_max_retry, 6111 .maxlen = sizeof(int), 6112 .mode = 0644, 6113 .proc_handler = proc_dointvec, 6114 }, 6115 { 6116 .procname = "max_desync_factor", 6117 .data = &ipv6_devconf.max_desync_factor, 6118 .maxlen = sizeof(int), 6119 .mode = 0644, 6120 .proc_handler = proc_dointvec, 6121 }, 6122 { 6123 .procname = "max_addresses", 6124 .data = &ipv6_devconf.max_addresses, 6125 .maxlen = sizeof(int), 6126 .mode = 0644, 6127 .proc_handler = proc_dointvec, 6128 }, 6129 { 6130 .procname = "accept_ra_defrtr", 6131 .data = &ipv6_devconf.accept_ra_defrtr, 6132 .maxlen = sizeof(int), 6133 .mode = 0644, 6134 .proc_handler = proc_dointvec, 6135 }, 6136 { 6137 .procname = "accept_ra_min_hop_limit", 6138 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6139 .maxlen = sizeof(int), 6140 .mode = 0644, 6141 .proc_handler = proc_dointvec, 6142 }, 6143 { 6144 .procname = "accept_ra_pinfo", 6145 .data = &ipv6_devconf.accept_ra_pinfo, 6146 .maxlen = sizeof(int), 6147 .mode = 0644, 6148 .proc_handler = proc_dointvec, 6149 }, 6150 #ifdef CONFIG_IPV6_ROUTER_PREF 6151 { 6152 .procname = "accept_ra_rtr_pref", 6153 .data = &ipv6_devconf.accept_ra_rtr_pref, 6154 .maxlen = sizeof(int), 6155 .mode = 0644, 6156 .proc_handler = proc_dointvec, 6157 }, 6158 { 6159 .procname = "router_probe_interval", 6160 .data = &ipv6_devconf.rtr_probe_interval, 6161 .maxlen = sizeof(int), 6162 .mode = 0644, 6163 .proc_handler = proc_dointvec_jiffies, 6164 }, 6165 #ifdef CONFIG_IPV6_ROUTE_INFO 6166 { 6167 .procname = "accept_ra_rt_info_min_plen", 6168 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6169 .maxlen = sizeof(int), 6170 .mode = 0644, 6171 .proc_handler = proc_dointvec, 6172 }, 6173 { 6174 .procname = "accept_ra_rt_info_max_plen", 6175 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6176 .maxlen = sizeof(int), 6177 .mode = 0644, 6178 .proc_handler = proc_dointvec, 6179 }, 6180 #endif 6181 #endif 6182 { 6183 .procname = "proxy_ndp", 6184 .data = &ipv6_devconf.proxy_ndp, 6185 .maxlen = sizeof(int), 6186 .mode = 0644, 6187 .proc_handler = addrconf_sysctl_proxy_ndp, 6188 }, 6189 { 6190 .procname = "accept_source_route", 6191 .data = &ipv6_devconf.accept_source_route, 6192 .maxlen = sizeof(int), 6193 .mode = 0644, 6194 .proc_handler = proc_dointvec, 6195 }, 6196 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6197 { 6198 .procname = "optimistic_dad", 6199 .data = &ipv6_devconf.optimistic_dad, 6200 .maxlen = sizeof(int), 6201 .mode = 0644, 6202 .proc_handler = proc_dointvec, 6203 }, 6204 { 6205 .procname = "use_optimistic", 6206 .data = &ipv6_devconf.use_optimistic, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = proc_dointvec, 6210 }, 6211 #endif 6212 #ifdef CONFIG_IPV6_MROUTE 6213 { 6214 .procname = "mc_forwarding", 6215 .data = &ipv6_devconf.mc_forwarding, 6216 .maxlen = sizeof(int), 6217 .mode = 0444, 6218 .proc_handler = proc_dointvec, 6219 }, 6220 #endif 6221 { 6222 .procname = "disable_ipv6", 6223 .data = &ipv6_devconf.disable_ipv6, 6224 .maxlen = sizeof(int), 6225 .mode = 0644, 6226 .proc_handler = addrconf_sysctl_disable, 6227 }, 6228 { 6229 .procname = "accept_dad", 6230 .data = &ipv6_devconf.accept_dad, 6231 .maxlen = sizeof(int), 6232 .mode = 0644, 6233 .proc_handler = proc_dointvec, 6234 }, 6235 { 6236 .procname = "force_tllao", 6237 .data = &ipv6_devconf.force_tllao, 6238 .maxlen = sizeof(int), 6239 .mode = 0644, 6240 .proc_handler = proc_dointvec 6241 }, 6242 { 6243 .procname = "ndisc_notify", 6244 .data = &ipv6_devconf.ndisc_notify, 6245 .maxlen = sizeof(int), 6246 .mode = 0644, 6247 .proc_handler = proc_dointvec 6248 }, 6249 { 6250 .procname = "suppress_frag_ndisc", 6251 .data = &ipv6_devconf.suppress_frag_ndisc, 6252 .maxlen = sizeof(int), 6253 .mode = 0644, 6254 .proc_handler = proc_dointvec 6255 }, 6256 { 6257 .procname = "accept_ra_from_local", 6258 .data = &ipv6_devconf.accept_ra_from_local, 6259 .maxlen = sizeof(int), 6260 .mode = 0644, 6261 .proc_handler = proc_dointvec, 6262 }, 6263 { 6264 .procname = "accept_ra_mtu", 6265 .data = &ipv6_devconf.accept_ra_mtu, 6266 .maxlen = sizeof(int), 6267 .mode = 0644, 6268 .proc_handler = proc_dointvec, 6269 }, 6270 { 6271 .procname = "stable_secret", 6272 .data = &ipv6_devconf.stable_secret, 6273 .maxlen = IPV6_MAX_STRLEN, 6274 .mode = 0600, 6275 .proc_handler = addrconf_sysctl_stable_secret, 6276 }, 6277 { 6278 .procname = "use_oif_addrs_only", 6279 .data = &ipv6_devconf.use_oif_addrs_only, 6280 .maxlen = sizeof(int), 6281 .mode = 0644, 6282 .proc_handler = proc_dointvec, 6283 }, 6284 { 6285 .procname = "ignore_routes_with_linkdown", 6286 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6287 .maxlen = sizeof(int), 6288 .mode = 0644, 6289 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6290 }, 6291 { 6292 .procname = "drop_unicast_in_l2_multicast", 6293 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6294 .maxlen = sizeof(int), 6295 .mode = 0644, 6296 .proc_handler = proc_dointvec, 6297 }, 6298 { 6299 .procname = "drop_unsolicited_na", 6300 .data = &ipv6_devconf.drop_unsolicited_na, 6301 .maxlen = sizeof(int), 6302 .mode = 0644, 6303 .proc_handler = proc_dointvec, 6304 }, 6305 { 6306 .procname = "keep_addr_on_down", 6307 .data = &ipv6_devconf.keep_addr_on_down, 6308 .maxlen = sizeof(int), 6309 .mode = 0644, 6310 .proc_handler = proc_dointvec, 6311 6312 }, 6313 { 6314 .procname = "seg6_enabled", 6315 .data = &ipv6_devconf.seg6_enabled, 6316 .maxlen = sizeof(int), 6317 .mode = 0644, 6318 .proc_handler = proc_dointvec, 6319 }, 6320 #ifdef CONFIG_IPV6_SEG6_HMAC 6321 { 6322 .procname = "seg6_require_hmac", 6323 .data = &ipv6_devconf.seg6_require_hmac, 6324 .maxlen = sizeof(int), 6325 .mode = 0644, 6326 .proc_handler = proc_dointvec, 6327 }, 6328 #endif 6329 { 6330 .procname = "enhanced_dad", 6331 .data = &ipv6_devconf.enhanced_dad, 6332 .maxlen = sizeof(int), 6333 .mode = 0644, 6334 .proc_handler = proc_dointvec, 6335 }, 6336 { 6337 .procname = "addr_gen_mode", 6338 .data = &ipv6_devconf.addr_gen_mode, 6339 .maxlen = sizeof(int), 6340 .mode = 0644, 6341 .proc_handler = addrconf_sysctl_addr_gen_mode, 6342 }, 6343 { 6344 .procname = "disable_policy", 6345 .data = &ipv6_devconf.disable_policy, 6346 .maxlen = sizeof(int), 6347 .mode = 0644, 6348 .proc_handler = addrconf_sysctl_disable_policy, 6349 }, 6350 { 6351 /* sentinel */ 6352 } 6353 }; 6354 6355 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6356 struct inet6_dev *idev, struct ipv6_devconf *p) 6357 { 6358 int i, ifindex; 6359 struct ctl_table *table; 6360 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6361 6362 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6363 if (!table) 6364 goto out; 6365 6366 for (i = 0; table[i].data; i++) { 6367 table[i].data += (char *)p - (char *)&ipv6_devconf; 6368 /* If one of these is already set, then it is not safe to 6369 * overwrite either of them: this makes proc_dointvec_minmax 6370 * usable. 6371 */ 6372 if (!table[i].extra1 && !table[i].extra2) { 6373 table[i].extra1 = idev; /* embedded; no ref */ 6374 table[i].extra2 = net; 6375 } 6376 } 6377 6378 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6379 6380 p->sysctl_header = register_net_sysctl(net, path, table); 6381 if (!p->sysctl_header) 6382 goto free; 6383 6384 if (!strcmp(dev_name, "all")) 6385 ifindex = NETCONFA_IFINDEX_ALL; 6386 else if (!strcmp(dev_name, "default")) 6387 ifindex = NETCONFA_IFINDEX_DEFAULT; 6388 else 6389 ifindex = idev->dev->ifindex; 6390 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6391 ifindex, p); 6392 return 0; 6393 6394 free: 6395 kfree(table); 6396 out: 6397 return -ENOBUFS; 6398 } 6399 6400 static void __addrconf_sysctl_unregister(struct net *net, 6401 struct ipv6_devconf *p, int ifindex) 6402 { 6403 struct ctl_table *table; 6404 6405 if (!p->sysctl_header) 6406 return; 6407 6408 table = p->sysctl_header->ctl_table_arg; 6409 unregister_net_sysctl_table(p->sysctl_header); 6410 p->sysctl_header = NULL; 6411 kfree(table); 6412 6413 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6414 } 6415 6416 static int addrconf_sysctl_register(struct inet6_dev *idev) 6417 { 6418 int err; 6419 6420 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6421 return -EINVAL; 6422 6423 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6424 &ndisc_ifinfo_sysctl_change); 6425 if (err) 6426 return err; 6427 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6428 idev, &idev->cnf); 6429 if (err) 6430 neigh_sysctl_unregister(idev->nd_parms); 6431 6432 return err; 6433 } 6434 6435 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6436 { 6437 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6438 idev->dev->ifindex); 6439 neigh_sysctl_unregister(idev->nd_parms); 6440 } 6441 6442 6443 #endif 6444 6445 static int __net_init addrconf_init_net(struct net *net) 6446 { 6447 int err = -ENOMEM; 6448 struct ipv6_devconf *all, *dflt; 6449 6450 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6451 if (!all) 6452 goto err_alloc_all; 6453 6454 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6455 if (!dflt) 6456 goto err_alloc_dflt; 6457 6458 /* these will be inherited by all namespaces */ 6459 dflt->autoconf = ipv6_defaults.autoconf; 6460 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6461 6462 dflt->stable_secret.initialized = false; 6463 all->stable_secret.initialized = false; 6464 6465 net->ipv6.devconf_all = all; 6466 net->ipv6.devconf_dflt = dflt; 6467 6468 #ifdef CONFIG_SYSCTL 6469 err = __addrconf_sysctl_register(net, "all", NULL, all); 6470 if (err < 0) 6471 goto err_reg_all; 6472 6473 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6474 if (err < 0) 6475 goto err_reg_dflt; 6476 #endif 6477 return 0; 6478 6479 #ifdef CONFIG_SYSCTL 6480 err_reg_dflt: 6481 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6482 err_reg_all: 6483 kfree(dflt); 6484 #endif 6485 err_alloc_dflt: 6486 kfree(all); 6487 err_alloc_all: 6488 return err; 6489 } 6490 6491 static void __net_exit addrconf_exit_net(struct net *net) 6492 { 6493 #ifdef CONFIG_SYSCTL 6494 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6495 NETCONFA_IFINDEX_DEFAULT); 6496 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6497 NETCONFA_IFINDEX_ALL); 6498 #endif 6499 kfree(net->ipv6.devconf_dflt); 6500 kfree(net->ipv6.devconf_all); 6501 } 6502 6503 static struct pernet_operations addrconf_ops = { 6504 .init = addrconf_init_net, 6505 .exit = addrconf_exit_net, 6506 }; 6507 6508 static struct rtnl_af_ops inet6_ops __read_mostly = { 6509 .family = AF_INET6, 6510 .fill_link_af = inet6_fill_link_af, 6511 .get_link_af_size = inet6_get_link_af_size, 6512 .validate_link_af = inet6_validate_link_af, 6513 .set_link_af = inet6_set_link_af, 6514 }; 6515 6516 /* 6517 * Init / cleanup code 6518 */ 6519 6520 int __init addrconf_init(void) 6521 { 6522 struct inet6_dev *idev; 6523 int i, err; 6524 6525 err = ipv6_addr_label_init(); 6526 if (err < 0) { 6527 pr_crit("%s: cannot initialize default policy table: %d\n", 6528 __func__, err); 6529 goto out; 6530 } 6531 6532 err = register_pernet_subsys(&addrconf_ops); 6533 if (err < 0) 6534 goto out_addrlabel; 6535 6536 addrconf_wq = create_workqueue("ipv6_addrconf"); 6537 if (!addrconf_wq) { 6538 err = -ENOMEM; 6539 goto out_nowq; 6540 } 6541 6542 /* The addrconf netdev notifier requires that loopback_dev 6543 * has it's ipv6 private information allocated and setup 6544 * before it can bring up and give link-local addresses 6545 * to other devices which are up. 6546 * 6547 * Unfortunately, loopback_dev is not necessarily the first 6548 * entry in the global dev_base list of net devices. In fact, 6549 * it is likely to be the very last entry on that list. 6550 * So this causes the notifier registry below to try and 6551 * give link-local addresses to all devices besides loopback_dev 6552 * first, then loopback_dev, which cases all the non-loopback_dev 6553 * devices to fail to get a link-local address. 6554 * 6555 * So, as a temporary fix, allocate the ipv6 structure for 6556 * loopback_dev first by hand. 6557 * Longer term, all of the dependencies ipv6 has upon the loopback 6558 * device and it being up should be removed. 6559 */ 6560 rtnl_lock(); 6561 idev = ipv6_add_dev(init_net.loopback_dev); 6562 rtnl_unlock(); 6563 if (IS_ERR(idev)) { 6564 err = PTR_ERR(idev); 6565 goto errlo; 6566 } 6567 6568 ip6_route_init_special_entries(); 6569 6570 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6571 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6572 6573 register_netdevice_notifier(&ipv6_dev_notf); 6574 6575 addrconf_verify(); 6576 6577 rtnl_af_register(&inet6_ops); 6578 6579 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6580 0); 6581 if (err < 0) 6582 goto errout; 6583 6584 /* Only the first call to __rtnl_register can fail */ 6585 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0); 6586 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0); 6587 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6588 inet6_dump_ifaddr, 0); 6589 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6590 inet6_dump_ifmcaddr, 0); 6591 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6592 inet6_dump_ifacaddr, 0); 6593 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6594 inet6_netconf_dump_devconf, 0); 6595 6596 ipv6_addr_label_rtnl_register(); 6597 6598 return 0; 6599 errout: 6600 rtnl_af_unregister(&inet6_ops); 6601 unregister_netdevice_notifier(&ipv6_dev_notf); 6602 errlo: 6603 destroy_workqueue(addrconf_wq); 6604 out_nowq: 6605 unregister_pernet_subsys(&addrconf_ops); 6606 out_addrlabel: 6607 ipv6_addr_label_cleanup(); 6608 out: 6609 return err; 6610 } 6611 6612 void addrconf_cleanup(void) 6613 { 6614 struct net_device *dev; 6615 int i; 6616 6617 unregister_netdevice_notifier(&ipv6_dev_notf); 6618 unregister_pernet_subsys(&addrconf_ops); 6619 ipv6_addr_label_cleanup(); 6620 6621 rtnl_lock(); 6622 6623 __rtnl_af_unregister(&inet6_ops); 6624 6625 /* clean dev list */ 6626 for_each_netdev(&init_net, dev) { 6627 if (__in6_dev_get(dev) == NULL) 6628 continue; 6629 addrconf_ifdown(dev, 1); 6630 } 6631 addrconf_ifdown(init_net.loopback_dev, 2); 6632 6633 /* 6634 * Check hash table. 6635 */ 6636 spin_lock_bh(&addrconf_hash_lock); 6637 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6638 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6639 spin_unlock_bh(&addrconf_hash_lock); 6640 cancel_delayed_work(&addr_chk_work); 6641 rtnl_unlock(); 6642 6643 destroy_workqueue(addrconf_wq); 6644 } 6645