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