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 if (!delayed_work_pending(&ifp->dad_work)) 336 in6_ifa_hold(ifp); 337 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 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 in6_dev_hold(ndev); 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 unsigned int hash; 967 int err = 0; 968 int addr_type = ipv6_addr_type(addr); 969 970 if (addr_type == IPV6_ADDR_ANY || 971 addr_type & IPV6_ADDR_MULTICAST || 972 (!(idev->dev->flags & IFF_LOOPBACK) && 973 addr_type & IPV6_ADDR_LOOPBACK)) 974 return ERR_PTR(-EADDRNOTAVAIL); 975 976 rcu_read_lock_bh(); 977 if (idev->dead) { 978 err = -ENODEV; /*XXX*/ 979 goto out2; 980 } 981 982 if (idev->cnf.disable_ipv6) { 983 err = -EACCES; 984 goto out2; 985 } 986 987 spin_lock(&addrconf_hash_lock); 988 989 /* Ignore adding duplicate addresses on an interface */ 990 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 991 ADBG("ipv6_add_addr: already assigned\n"); 992 err = -EEXIST; 993 goto out; 994 } 995 996 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 997 998 if (!ifa) { 999 ADBG("ipv6_add_addr: malloc failed\n"); 1000 err = -ENOBUFS; 1001 goto out; 1002 } 1003 1004 rt = addrconf_dst_alloc(idev, addr, false); 1005 if (IS_ERR(rt)) { 1006 err = PTR_ERR(rt); 1007 goto out; 1008 } 1009 1010 if (net->ipv6.devconf_all->disable_policy || 1011 idev->cnf.disable_policy) 1012 rt->dst.flags |= DST_NOPOLICY; 1013 1014 neigh_parms_data_state_setall(idev->nd_parms); 1015 1016 ifa->addr = *addr; 1017 if (peer_addr) 1018 ifa->peer_addr = *peer_addr; 1019 1020 spin_lock_init(&ifa->lock); 1021 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1022 INIT_HLIST_NODE(&ifa->addr_lst); 1023 ifa->scope = scope; 1024 ifa->prefix_len = pfxlen; 1025 ifa->flags = flags | IFA_F_TENTATIVE; 1026 ifa->valid_lft = valid_lft; 1027 ifa->prefered_lft = prefered_lft; 1028 ifa->cstamp = ifa->tstamp = jiffies; 1029 ifa->tokenized = false; 1030 1031 ifa->rt = rt; 1032 1033 ifa->idev = idev; 1034 in6_dev_hold(idev); 1035 /* For caller */ 1036 in6_ifa_hold(ifa); 1037 1038 /* Add to big hash table */ 1039 hash = inet6_addr_hash(addr); 1040 1041 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1042 spin_unlock(&addrconf_hash_lock); 1043 1044 write_lock(&idev->lock); 1045 /* Add to inet6_dev unicast addr list. */ 1046 ipv6_link_dev_addr(idev, ifa); 1047 1048 if (ifa->flags&IFA_F_TEMPORARY) { 1049 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1050 in6_ifa_hold(ifa); 1051 } 1052 1053 in6_ifa_hold(ifa); 1054 write_unlock(&idev->lock); 1055 out2: 1056 rcu_read_unlock_bh(); 1057 1058 if (likely(err == 0)) 1059 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1060 else { 1061 kfree(ifa); 1062 ifa = ERR_PTR(err); 1063 } 1064 1065 return ifa; 1066 out: 1067 spin_unlock(&addrconf_hash_lock); 1068 goto out2; 1069 } 1070 1071 enum cleanup_prefix_rt_t { 1072 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1073 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1074 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1075 }; 1076 1077 /* 1078 * Check, whether the prefix for ifp would still need a prefix route 1079 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1080 * constants. 1081 * 1082 * 1) we don't purge prefix if address was not permanent. 1083 * prefix is managed by its own lifetime. 1084 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1085 * 3) if there are no addresses, delete prefix. 1086 * 4) if there are still other permanent address(es), 1087 * corresponding prefix is still permanent. 1088 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1089 * don't purge the prefix, assume user space is managing it. 1090 * 6) otherwise, update prefix lifetime to the 1091 * longest valid lifetime among the corresponding 1092 * addresses on the device. 1093 * Note: subsequent RA will update lifetime. 1094 **/ 1095 static enum cleanup_prefix_rt_t 1096 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1097 { 1098 struct inet6_ifaddr *ifa; 1099 struct inet6_dev *idev = ifp->idev; 1100 unsigned long lifetime; 1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1102 1103 *expires = jiffies; 1104 1105 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1106 if (ifa == ifp) 1107 continue; 1108 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1109 ifp->prefix_len)) 1110 continue; 1111 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1112 return CLEANUP_PREFIX_RT_NOP; 1113 1114 action = CLEANUP_PREFIX_RT_EXPIRE; 1115 1116 spin_lock(&ifa->lock); 1117 1118 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1119 /* 1120 * Note: Because this address is 1121 * not permanent, lifetime < 1122 * LONG_MAX / HZ here. 1123 */ 1124 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1125 *expires = ifa->tstamp + lifetime * HZ; 1126 spin_unlock(&ifa->lock); 1127 } 1128 1129 return action; 1130 } 1131 1132 static void 1133 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1134 { 1135 struct rt6_info *rt; 1136 1137 rt = addrconf_get_prefix_route(&ifp->addr, 1138 ifp->prefix_len, 1139 ifp->idev->dev, 1140 0, RTF_GATEWAY | RTF_DEFAULT); 1141 if (rt) { 1142 if (del_rt) 1143 ip6_del_rt(rt); 1144 else { 1145 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1146 rt6_set_expires(rt, expires); 1147 ip6_rt_put(rt); 1148 } 1149 } 1150 } 1151 1152 1153 /* This function wants to get referenced ifp and releases it before return */ 1154 1155 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1156 { 1157 int state; 1158 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1159 unsigned long expires; 1160 1161 ASSERT_RTNL(); 1162 1163 spin_lock_bh(&ifp->lock); 1164 state = ifp->state; 1165 ifp->state = INET6_IFADDR_STATE_DEAD; 1166 spin_unlock_bh(&ifp->lock); 1167 1168 if (state == INET6_IFADDR_STATE_DEAD) 1169 goto out; 1170 1171 spin_lock_bh(&addrconf_hash_lock); 1172 hlist_del_init_rcu(&ifp->addr_lst); 1173 spin_unlock_bh(&addrconf_hash_lock); 1174 1175 write_lock_bh(&ifp->idev->lock); 1176 1177 if (ifp->flags&IFA_F_TEMPORARY) { 1178 list_del(&ifp->tmp_list); 1179 if (ifp->ifpub) { 1180 in6_ifa_put(ifp->ifpub); 1181 ifp->ifpub = NULL; 1182 } 1183 __in6_ifa_put(ifp); 1184 } 1185 1186 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1187 action = check_cleanup_prefix_route(ifp, &expires); 1188 1189 list_del_init(&ifp->if_list); 1190 __in6_ifa_put(ifp); 1191 1192 write_unlock_bh(&ifp->idev->lock); 1193 1194 addrconf_del_dad_work(ifp); 1195 1196 ipv6_ifa_notify(RTM_DELADDR, ifp); 1197 1198 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1199 1200 if (action != CLEANUP_PREFIX_RT_NOP) { 1201 cleanup_prefix_route(ifp, expires, 1202 action == CLEANUP_PREFIX_RT_DEL); 1203 } 1204 1205 /* clean up prefsrc entries */ 1206 rt6_remove_prefsrc(ifp); 1207 out: 1208 in6_ifa_put(ifp); 1209 } 1210 1211 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1212 { 1213 struct inet6_dev *idev = ifp->idev; 1214 struct in6_addr addr, *tmpaddr; 1215 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1216 unsigned long regen_advance; 1217 int tmp_plen; 1218 int ret = 0; 1219 u32 addr_flags; 1220 unsigned long now = jiffies; 1221 long max_desync_factor; 1222 s32 cnf_temp_preferred_lft; 1223 1224 write_lock_bh(&idev->lock); 1225 if (ift) { 1226 spin_lock_bh(&ift->lock); 1227 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1228 spin_unlock_bh(&ift->lock); 1229 tmpaddr = &addr; 1230 } else { 1231 tmpaddr = NULL; 1232 } 1233 retry: 1234 in6_dev_hold(idev); 1235 if (idev->cnf.use_tempaddr <= 0) { 1236 write_unlock_bh(&idev->lock); 1237 pr_info("%s: use_tempaddr is disabled\n", __func__); 1238 in6_dev_put(idev); 1239 ret = -1; 1240 goto out; 1241 } 1242 spin_lock_bh(&ifp->lock); 1243 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1244 idev->cnf.use_tempaddr = -1; /*XXX*/ 1245 spin_unlock_bh(&ifp->lock); 1246 write_unlock_bh(&idev->lock); 1247 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1248 __func__); 1249 in6_dev_put(idev); 1250 ret = -1; 1251 goto out; 1252 } 1253 in6_ifa_hold(ifp); 1254 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1255 ipv6_try_regen_rndid(idev, tmpaddr); 1256 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1257 age = (now - ifp->tstamp) / HZ; 1258 1259 regen_advance = idev->cnf.regen_max_retry * 1260 idev->cnf.dad_transmits * 1261 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1262 1263 /* recalculate max_desync_factor each time and update 1264 * idev->desync_factor if it's larger 1265 */ 1266 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1267 max_desync_factor = min_t(__u32, 1268 idev->cnf.max_desync_factor, 1269 cnf_temp_preferred_lft - regen_advance); 1270 1271 if (unlikely(idev->desync_factor > max_desync_factor)) { 1272 if (max_desync_factor > 0) { 1273 get_random_bytes(&idev->desync_factor, 1274 sizeof(idev->desync_factor)); 1275 idev->desync_factor %= max_desync_factor; 1276 } else { 1277 idev->desync_factor = 0; 1278 } 1279 } 1280 1281 tmp_valid_lft = min_t(__u32, 1282 ifp->valid_lft, 1283 idev->cnf.temp_valid_lft + age); 1284 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1285 idev->desync_factor; 1286 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1287 tmp_plen = ifp->prefix_len; 1288 tmp_tstamp = ifp->tstamp; 1289 spin_unlock_bh(&ifp->lock); 1290 1291 write_unlock_bh(&idev->lock); 1292 1293 /* A temporary address is created only if this calculated Preferred 1294 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1295 * an implementation must not create a temporary address with a zero 1296 * Preferred Lifetime. 1297 * Use age calculation as in addrconf_verify to avoid unnecessary 1298 * temporary addresses being generated. 1299 */ 1300 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1301 if (tmp_prefered_lft <= regen_advance + age) { 1302 in6_ifa_put(ifp); 1303 in6_dev_put(idev); 1304 ret = -1; 1305 goto out; 1306 } 1307 1308 addr_flags = IFA_F_TEMPORARY; 1309 /* set in addrconf_prefix_rcv() */ 1310 if (ifp->flags & IFA_F_OPTIMISTIC) 1311 addr_flags |= IFA_F_OPTIMISTIC; 1312 1313 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1314 ipv6_addr_scope(&addr), addr_flags, 1315 tmp_valid_lft, tmp_prefered_lft); 1316 if (IS_ERR(ift)) { 1317 in6_ifa_put(ifp); 1318 in6_dev_put(idev); 1319 pr_info("%s: retry temporary address regeneration\n", __func__); 1320 tmpaddr = &addr; 1321 write_lock_bh(&idev->lock); 1322 goto retry; 1323 } 1324 1325 spin_lock_bh(&ift->lock); 1326 ift->ifpub = ifp; 1327 ift->cstamp = now; 1328 ift->tstamp = tmp_tstamp; 1329 spin_unlock_bh(&ift->lock); 1330 1331 addrconf_dad_start(ift); 1332 in6_ifa_put(ift); 1333 in6_dev_put(idev); 1334 out: 1335 return ret; 1336 } 1337 1338 /* 1339 * Choose an appropriate source address (RFC3484) 1340 */ 1341 enum { 1342 IPV6_SADDR_RULE_INIT = 0, 1343 IPV6_SADDR_RULE_LOCAL, 1344 IPV6_SADDR_RULE_SCOPE, 1345 IPV6_SADDR_RULE_PREFERRED, 1346 #ifdef CONFIG_IPV6_MIP6 1347 IPV6_SADDR_RULE_HOA, 1348 #endif 1349 IPV6_SADDR_RULE_OIF, 1350 IPV6_SADDR_RULE_LABEL, 1351 IPV6_SADDR_RULE_PRIVACY, 1352 IPV6_SADDR_RULE_ORCHID, 1353 IPV6_SADDR_RULE_PREFIX, 1354 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1355 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1356 #endif 1357 IPV6_SADDR_RULE_MAX 1358 }; 1359 1360 struct ipv6_saddr_score { 1361 int rule; 1362 int addr_type; 1363 struct inet6_ifaddr *ifa; 1364 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1365 int scopedist; 1366 int matchlen; 1367 }; 1368 1369 struct ipv6_saddr_dst { 1370 const struct in6_addr *addr; 1371 int ifindex; 1372 int scope; 1373 int label; 1374 unsigned int prefs; 1375 }; 1376 1377 static inline int ipv6_saddr_preferred(int type) 1378 { 1379 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1380 return 1; 1381 return 0; 1382 } 1383 1384 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1385 { 1386 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1387 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1388 #else 1389 return false; 1390 #endif 1391 } 1392 1393 static int ipv6_get_saddr_eval(struct net *net, 1394 struct ipv6_saddr_score *score, 1395 struct ipv6_saddr_dst *dst, 1396 int i) 1397 { 1398 int ret; 1399 1400 if (i <= score->rule) { 1401 switch (i) { 1402 case IPV6_SADDR_RULE_SCOPE: 1403 ret = score->scopedist; 1404 break; 1405 case IPV6_SADDR_RULE_PREFIX: 1406 ret = score->matchlen; 1407 break; 1408 default: 1409 ret = !!test_bit(i, score->scorebits); 1410 } 1411 goto out; 1412 } 1413 1414 switch (i) { 1415 case IPV6_SADDR_RULE_INIT: 1416 /* Rule 0: remember if hiscore is not ready yet */ 1417 ret = !!score->ifa; 1418 break; 1419 case IPV6_SADDR_RULE_LOCAL: 1420 /* Rule 1: Prefer same address */ 1421 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1422 break; 1423 case IPV6_SADDR_RULE_SCOPE: 1424 /* Rule 2: Prefer appropriate scope 1425 * 1426 * ret 1427 * ^ 1428 * -1 | d 15 1429 * ---+--+-+---> scope 1430 * | 1431 * | d is scope of the destination. 1432 * B-d | \ 1433 * | \ <- smaller scope is better if 1434 * B-15 | \ if scope is enough for destination. 1435 * | ret = B - scope (-1 <= scope >= d <= 15). 1436 * d-C-1 | / 1437 * |/ <- greater is better 1438 * -C / if scope is not enough for destination. 1439 * /| ret = scope - C (-1 <= d < scope <= 15). 1440 * 1441 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1442 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1443 * Assume B = 0 and we get C > 29. 1444 */ 1445 ret = __ipv6_addr_src_scope(score->addr_type); 1446 if (ret >= dst->scope) 1447 ret = -ret; 1448 else 1449 ret -= 128; /* 30 is enough */ 1450 score->scopedist = ret; 1451 break; 1452 case IPV6_SADDR_RULE_PREFERRED: 1453 { 1454 /* Rule 3: Avoid deprecated and optimistic addresses */ 1455 u8 avoid = IFA_F_DEPRECATED; 1456 1457 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1458 avoid |= IFA_F_OPTIMISTIC; 1459 ret = ipv6_saddr_preferred(score->addr_type) || 1460 !(score->ifa->flags & avoid); 1461 break; 1462 } 1463 #ifdef CONFIG_IPV6_MIP6 1464 case IPV6_SADDR_RULE_HOA: 1465 { 1466 /* Rule 4: Prefer home address */ 1467 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1468 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1469 break; 1470 } 1471 #endif 1472 case IPV6_SADDR_RULE_OIF: 1473 /* Rule 5: Prefer outgoing interface */ 1474 ret = (!dst->ifindex || 1475 dst->ifindex == score->ifa->idev->dev->ifindex); 1476 break; 1477 case IPV6_SADDR_RULE_LABEL: 1478 /* Rule 6: Prefer matching label */ 1479 ret = ipv6_addr_label(net, 1480 &score->ifa->addr, score->addr_type, 1481 score->ifa->idev->dev->ifindex) == dst->label; 1482 break; 1483 case IPV6_SADDR_RULE_PRIVACY: 1484 { 1485 /* Rule 7: Prefer public address 1486 * Note: prefer temporary address if use_tempaddr >= 2 1487 */ 1488 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1489 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1490 score->ifa->idev->cnf.use_tempaddr >= 2; 1491 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1492 break; 1493 } 1494 case IPV6_SADDR_RULE_ORCHID: 1495 /* Rule 8-: Prefer ORCHID vs ORCHID or 1496 * non-ORCHID vs non-ORCHID 1497 */ 1498 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1499 ipv6_addr_orchid(dst->addr)); 1500 break; 1501 case IPV6_SADDR_RULE_PREFIX: 1502 /* Rule 8: Use longest matching prefix */ 1503 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1504 if (ret > score->ifa->prefix_len) 1505 ret = score->ifa->prefix_len; 1506 score->matchlen = ret; 1507 break; 1508 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1509 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1510 /* Optimistic addresses still have lower precedence than other 1511 * preferred addresses. 1512 */ 1513 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1514 break; 1515 #endif 1516 default: 1517 ret = 0; 1518 } 1519 1520 if (ret) 1521 __set_bit(i, score->scorebits); 1522 score->rule = i; 1523 out: 1524 return ret; 1525 } 1526 1527 static int __ipv6_dev_get_saddr(struct net *net, 1528 struct ipv6_saddr_dst *dst, 1529 struct inet6_dev *idev, 1530 struct ipv6_saddr_score *scores, 1531 int hiscore_idx) 1532 { 1533 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1534 1535 read_lock_bh(&idev->lock); 1536 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1537 int i; 1538 1539 /* 1540 * - Tentative Address (RFC2462 section 5.4) 1541 * - A tentative address is not considered 1542 * "assigned to an interface" in the traditional 1543 * sense, unless it is also flagged as optimistic. 1544 * - Candidate Source Address (section 4) 1545 * - In any case, anycast addresses, multicast 1546 * addresses, and the unspecified address MUST 1547 * NOT be included in a candidate set. 1548 */ 1549 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1550 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1551 continue; 1552 1553 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1554 1555 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1556 score->addr_type & IPV6_ADDR_MULTICAST)) { 1557 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1558 idev->dev->name); 1559 continue; 1560 } 1561 1562 score->rule = -1; 1563 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1564 1565 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1566 int minihiscore, miniscore; 1567 1568 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1569 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1570 1571 if (minihiscore > miniscore) { 1572 if (i == IPV6_SADDR_RULE_SCOPE && 1573 score->scopedist > 0) { 1574 /* 1575 * special case: 1576 * each remaining entry 1577 * has too small (not enough) 1578 * scope, because ifa entries 1579 * are sorted by their scope 1580 * values. 1581 */ 1582 goto out; 1583 } 1584 break; 1585 } else if (minihiscore < miniscore) { 1586 if (hiscore->ifa) 1587 in6_ifa_put(hiscore->ifa); 1588 1589 in6_ifa_hold(score->ifa); 1590 1591 swap(hiscore, score); 1592 hiscore_idx = 1 - hiscore_idx; 1593 1594 /* restore our iterator */ 1595 score->ifa = hiscore->ifa; 1596 1597 break; 1598 } 1599 } 1600 } 1601 out: 1602 read_unlock_bh(&idev->lock); 1603 return hiscore_idx; 1604 } 1605 1606 static int ipv6_get_saddr_master(struct net *net, 1607 const struct net_device *dst_dev, 1608 const struct net_device *master, 1609 struct ipv6_saddr_dst *dst, 1610 struct ipv6_saddr_score *scores, 1611 int hiscore_idx) 1612 { 1613 struct inet6_dev *idev; 1614 1615 idev = __in6_dev_get(dst_dev); 1616 if (idev) 1617 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1618 scores, hiscore_idx); 1619 1620 idev = __in6_dev_get(master); 1621 if (idev) 1622 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1623 scores, hiscore_idx); 1624 1625 return hiscore_idx; 1626 } 1627 1628 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1629 const struct in6_addr *daddr, unsigned int prefs, 1630 struct in6_addr *saddr) 1631 { 1632 struct ipv6_saddr_score scores[2], *hiscore; 1633 struct ipv6_saddr_dst dst; 1634 struct inet6_dev *idev; 1635 struct net_device *dev; 1636 int dst_type; 1637 bool use_oif_addr = false; 1638 int hiscore_idx = 0; 1639 1640 dst_type = __ipv6_addr_type(daddr); 1641 dst.addr = daddr; 1642 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1643 dst.scope = __ipv6_addr_src_scope(dst_type); 1644 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1645 dst.prefs = prefs; 1646 1647 scores[hiscore_idx].rule = -1; 1648 scores[hiscore_idx].ifa = NULL; 1649 1650 rcu_read_lock(); 1651 1652 /* Candidate Source Address (section 4) 1653 * - multicast and link-local destination address, 1654 * the set of candidate source address MUST only 1655 * include addresses assigned to interfaces 1656 * belonging to the same link as the outgoing 1657 * interface. 1658 * (- For site-local destination addresses, the 1659 * set of candidate source addresses MUST only 1660 * include addresses assigned to interfaces 1661 * belonging to the same site as the outgoing 1662 * interface.) 1663 * - "It is RECOMMENDED that the candidate source addresses 1664 * be the set of unicast addresses assigned to the 1665 * interface that will be used to send to the destination 1666 * (the 'outgoing' interface)." (RFC 6724) 1667 */ 1668 if (dst_dev) { 1669 idev = __in6_dev_get(dst_dev); 1670 if ((dst_type & IPV6_ADDR_MULTICAST) || 1671 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1672 (idev && idev->cnf.use_oif_addrs_only)) { 1673 use_oif_addr = true; 1674 } 1675 } 1676 1677 if (use_oif_addr) { 1678 if (idev) 1679 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1680 } else { 1681 const struct net_device *master; 1682 int master_idx = 0; 1683 1684 /* if dst_dev exists and is enslaved to an L3 device, then 1685 * prefer addresses from dst_dev and then the master over 1686 * any other enslaved devices in the L3 domain. 1687 */ 1688 master = l3mdev_master_dev_rcu(dst_dev); 1689 if (master) { 1690 master_idx = master->ifindex; 1691 1692 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1693 master, &dst, 1694 scores, hiscore_idx); 1695 1696 if (scores[hiscore_idx].ifa) 1697 goto out; 1698 } 1699 1700 for_each_netdev_rcu(net, dev) { 1701 /* only consider addresses on devices in the 1702 * same L3 domain 1703 */ 1704 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1705 continue; 1706 idev = __in6_dev_get(dev); 1707 if (!idev) 1708 continue; 1709 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1710 } 1711 } 1712 1713 out: 1714 rcu_read_unlock(); 1715 1716 hiscore = &scores[hiscore_idx]; 1717 if (!hiscore->ifa) 1718 return -EADDRNOTAVAIL; 1719 1720 *saddr = hiscore->ifa->addr; 1721 in6_ifa_put(hiscore->ifa); 1722 return 0; 1723 } 1724 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1725 1726 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1727 u32 banned_flags) 1728 { 1729 struct inet6_ifaddr *ifp; 1730 int err = -EADDRNOTAVAIL; 1731 1732 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1733 if (ifp->scope > IFA_LINK) 1734 break; 1735 if (ifp->scope == IFA_LINK && 1736 !(ifp->flags & banned_flags)) { 1737 *addr = ifp->addr; 1738 err = 0; 1739 break; 1740 } 1741 } 1742 return err; 1743 } 1744 1745 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1746 u32 banned_flags) 1747 { 1748 struct inet6_dev *idev; 1749 int err = -EADDRNOTAVAIL; 1750 1751 rcu_read_lock(); 1752 idev = __in6_dev_get(dev); 1753 if (idev) { 1754 read_lock_bh(&idev->lock); 1755 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1756 read_unlock_bh(&idev->lock); 1757 } 1758 rcu_read_unlock(); 1759 return err; 1760 } 1761 1762 static int ipv6_count_addresses(struct inet6_dev *idev) 1763 { 1764 int cnt = 0; 1765 struct inet6_ifaddr *ifp; 1766 1767 read_lock_bh(&idev->lock); 1768 list_for_each_entry(ifp, &idev->addr_list, if_list) 1769 cnt++; 1770 read_unlock_bh(&idev->lock); 1771 return cnt; 1772 } 1773 1774 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1775 const struct net_device *dev, int strict) 1776 { 1777 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1778 } 1779 EXPORT_SYMBOL(ipv6_chk_addr); 1780 1781 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1782 const struct net_device *dev, int strict, 1783 u32 banned_flags) 1784 { 1785 struct inet6_ifaddr *ifp; 1786 unsigned int hash = inet6_addr_hash(addr); 1787 u32 ifp_flags; 1788 1789 rcu_read_lock_bh(); 1790 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1791 if (!net_eq(dev_net(ifp->idev->dev), net)) 1792 continue; 1793 /* Decouple optimistic from tentative for evaluation here. 1794 * Ban optimistic addresses explicitly, when required. 1795 */ 1796 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1797 ? (ifp->flags&~IFA_F_TENTATIVE) 1798 : ifp->flags; 1799 if (ipv6_addr_equal(&ifp->addr, addr) && 1800 !(ifp_flags&banned_flags) && 1801 (!dev || ifp->idev->dev == dev || 1802 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1803 rcu_read_unlock_bh(); 1804 return 1; 1805 } 1806 } 1807 1808 rcu_read_unlock_bh(); 1809 return 0; 1810 } 1811 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1812 1813 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1814 struct net_device *dev) 1815 { 1816 unsigned int hash = inet6_addr_hash(addr); 1817 struct inet6_ifaddr *ifp; 1818 1819 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1820 if (!net_eq(dev_net(ifp->idev->dev), net)) 1821 continue; 1822 if (ipv6_addr_equal(&ifp->addr, addr)) { 1823 if (!dev || ifp->idev->dev == dev) 1824 return true; 1825 } 1826 } 1827 return false; 1828 } 1829 1830 /* Compares an address/prefix_len with addresses on device @dev. 1831 * If one is found it returns true. 1832 */ 1833 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1834 const unsigned int prefix_len, struct net_device *dev) 1835 { 1836 struct inet6_dev *idev; 1837 struct inet6_ifaddr *ifa; 1838 bool ret = false; 1839 1840 rcu_read_lock(); 1841 idev = __in6_dev_get(dev); 1842 if (idev) { 1843 read_lock_bh(&idev->lock); 1844 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1845 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1846 if (ret) 1847 break; 1848 } 1849 read_unlock_bh(&idev->lock); 1850 } 1851 rcu_read_unlock(); 1852 1853 return ret; 1854 } 1855 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1856 1857 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1858 { 1859 struct inet6_dev *idev; 1860 struct inet6_ifaddr *ifa; 1861 int onlink; 1862 1863 onlink = 0; 1864 rcu_read_lock(); 1865 idev = __in6_dev_get(dev); 1866 if (idev) { 1867 read_lock_bh(&idev->lock); 1868 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1869 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1870 ifa->prefix_len); 1871 if (onlink) 1872 break; 1873 } 1874 read_unlock_bh(&idev->lock); 1875 } 1876 rcu_read_unlock(); 1877 return onlink; 1878 } 1879 EXPORT_SYMBOL(ipv6_chk_prefix); 1880 1881 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1882 struct net_device *dev, int strict) 1883 { 1884 struct inet6_ifaddr *ifp, *result = NULL; 1885 unsigned int hash = inet6_addr_hash(addr); 1886 1887 rcu_read_lock_bh(); 1888 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1889 if (!net_eq(dev_net(ifp->idev->dev), net)) 1890 continue; 1891 if (ipv6_addr_equal(&ifp->addr, addr)) { 1892 if (!dev || ifp->idev->dev == dev || 1893 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1894 result = ifp; 1895 in6_ifa_hold(ifp); 1896 break; 1897 } 1898 } 1899 } 1900 rcu_read_unlock_bh(); 1901 1902 return result; 1903 } 1904 1905 /* Gets referenced address, destroys ifaddr */ 1906 1907 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1908 { 1909 if (dad_failed) 1910 ifp->flags |= IFA_F_DADFAILED; 1911 1912 if (ifp->flags&IFA_F_PERMANENT) { 1913 spin_lock_bh(&ifp->lock); 1914 addrconf_del_dad_work(ifp); 1915 ifp->flags |= IFA_F_TENTATIVE; 1916 spin_unlock_bh(&ifp->lock); 1917 if (dad_failed) 1918 ipv6_ifa_notify(0, ifp); 1919 in6_ifa_put(ifp); 1920 } else if (ifp->flags&IFA_F_TEMPORARY) { 1921 struct inet6_ifaddr *ifpub; 1922 spin_lock_bh(&ifp->lock); 1923 ifpub = ifp->ifpub; 1924 if (ifpub) { 1925 in6_ifa_hold(ifpub); 1926 spin_unlock_bh(&ifp->lock); 1927 ipv6_create_tempaddr(ifpub, ifp); 1928 in6_ifa_put(ifpub); 1929 } else { 1930 spin_unlock_bh(&ifp->lock); 1931 } 1932 ipv6_del_addr(ifp); 1933 } else { 1934 ipv6_del_addr(ifp); 1935 } 1936 } 1937 1938 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1939 { 1940 int err = -ENOENT; 1941 1942 spin_lock_bh(&ifp->lock); 1943 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1944 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1945 err = 0; 1946 } 1947 spin_unlock_bh(&ifp->lock); 1948 1949 return err; 1950 } 1951 1952 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1953 { 1954 struct inet6_dev *idev = ifp->idev; 1955 struct net *net = dev_net(ifp->idev->dev); 1956 1957 if (addrconf_dad_end(ifp)) { 1958 in6_ifa_put(ifp); 1959 return; 1960 } 1961 1962 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1963 ifp->idev->dev->name, &ifp->addr); 1964 1965 spin_lock_bh(&ifp->lock); 1966 1967 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1968 int scope = ifp->scope; 1969 u32 flags = ifp->flags; 1970 struct in6_addr new_addr; 1971 struct inet6_ifaddr *ifp2; 1972 u32 valid_lft, preferred_lft; 1973 int pfxlen = ifp->prefix_len; 1974 int retries = ifp->stable_privacy_retry + 1; 1975 1976 if (retries > net->ipv6.sysctl.idgen_retries) { 1977 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1978 ifp->idev->dev->name); 1979 goto errdad; 1980 } 1981 1982 new_addr = ifp->addr; 1983 if (ipv6_generate_stable_address(&new_addr, retries, 1984 idev)) 1985 goto errdad; 1986 1987 valid_lft = ifp->valid_lft; 1988 preferred_lft = ifp->prefered_lft; 1989 1990 spin_unlock_bh(&ifp->lock); 1991 1992 if (idev->cnf.max_addresses && 1993 ipv6_count_addresses(idev) >= 1994 idev->cnf.max_addresses) 1995 goto lock_errdad; 1996 1997 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1998 ifp->idev->dev->name); 1999 2000 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2001 scope, flags, valid_lft, 2002 preferred_lft); 2003 if (IS_ERR(ifp2)) 2004 goto lock_errdad; 2005 2006 spin_lock_bh(&ifp2->lock); 2007 ifp2->stable_privacy_retry = retries; 2008 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2009 spin_unlock_bh(&ifp2->lock); 2010 2011 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2012 in6_ifa_put(ifp2); 2013 lock_errdad: 2014 spin_lock_bh(&ifp->lock); 2015 } 2016 2017 errdad: 2018 /* transition from _POSTDAD to _ERRDAD */ 2019 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2020 spin_unlock_bh(&ifp->lock); 2021 2022 addrconf_mod_dad_work(ifp, 0); 2023 in6_ifa_put(ifp); 2024 } 2025 2026 /* Join to solicited addr multicast group. 2027 * caller must hold RTNL */ 2028 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2029 { 2030 struct in6_addr maddr; 2031 2032 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2033 return; 2034 2035 addrconf_addr_solict_mult(addr, &maddr); 2036 ipv6_dev_mc_inc(dev, &maddr); 2037 } 2038 2039 /* caller must hold RTNL */ 2040 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2041 { 2042 struct in6_addr maddr; 2043 2044 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2045 return; 2046 2047 addrconf_addr_solict_mult(addr, &maddr); 2048 __ipv6_dev_mc_dec(idev, &maddr); 2049 } 2050 2051 /* caller must hold RTNL */ 2052 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2053 { 2054 struct in6_addr addr; 2055 2056 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2057 return; 2058 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2059 if (ipv6_addr_any(&addr)) 2060 return; 2061 __ipv6_dev_ac_inc(ifp->idev, &addr); 2062 } 2063 2064 /* caller must hold RTNL */ 2065 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2066 { 2067 struct in6_addr addr; 2068 2069 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2070 return; 2071 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2072 if (ipv6_addr_any(&addr)) 2073 return; 2074 __ipv6_dev_ac_dec(ifp->idev, &addr); 2075 } 2076 2077 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2078 { 2079 switch (dev->addr_len) { 2080 case ETH_ALEN: 2081 memcpy(eui, dev->dev_addr, 3); 2082 eui[3] = 0xFF; 2083 eui[4] = 0xFE; 2084 memcpy(eui + 5, dev->dev_addr + 3, 3); 2085 break; 2086 case EUI64_ADDR_LEN: 2087 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2088 eui[0] ^= 2; 2089 break; 2090 default: 2091 return -1; 2092 } 2093 2094 return 0; 2095 } 2096 2097 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2098 { 2099 union fwnet_hwaddr *ha; 2100 2101 if (dev->addr_len != FWNET_ALEN) 2102 return -1; 2103 2104 ha = (union fwnet_hwaddr *)dev->dev_addr; 2105 2106 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2107 eui[0] ^= 2; 2108 return 0; 2109 } 2110 2111 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2112 { 2113 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2114 if (dev->addr_len != ARCNET_ALEN) 2115 return -1; 2116 memset(eui, 0, 7); 2117 eui[7] = *(u8 *)dev->dev_addr; 2118 return 0; 2119 } 2120 2121 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2122 { 2123 if (dev->addr_len != INFINIBAND_ALEN) 2124 return -1; 2125 memcpy(eui, dev->dev_addr + 12, 8); 2126 eui[0] |= 2; 2127 return 0; 2128 } 2129 2130 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2131 { 2132 if (addr == 0) 2133 return -1; 2134 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2135 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2136 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2137 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2138 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2139 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2140 eui[1] = 0; 2141 eui[2] = 0x5E; 2142 eui[3] = 0xFE; 2143 memcpy(eui + 4, &addr, 4); 2144 return 0; 2145 } 2146 2147 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2148 { 2149 if (dev->priv_flags & IFF_ISATAP) 2150 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2151 return -1; 2152 } 2153 2154 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2155 { 2156 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2157 } 2158 2159 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2160 { 2161 memcpy(eui, dev->perm_addr, 3); 2162 memcpy(eui + 5, dev->perm_addr + 3, 3); 2163 eui[3] = 0xFF; 2164 eui[4] = 0xFE; 2165 eui[0] ^= 2; 2166 return 0; 2167 } 2168 2169 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2170 { 2171 switch (dev->type) { 2172 case ARPHRD_ETHER: 2173 case ARPHRD_FDDI: 2174 return addrconf_ifid_eui48(eui, dev); 2175 case ARPHRD_ARCNET: 2176 return addrconf_ifid_arcnet(eui, dev); 2177 case ARPHRD_INFINIBAND: 2178 return addrconf_ifid_infiniband(eui, dev); 2179 case ARPHRD_SIT: 2180 return addrconf_ifid_sit(eui, dev); 2181 case ARPHRD_IPGRE: 2182 case ARPHRD_TUNNEL: 2183 return addrconf_ifid_gre(eui, dev); 2184 case ARPHRD_6LOWPAN: 2185 return addrconf_ifid_6lowpan(eui, dev); 2186 case ARPHRD_IEEE1394: 2187 return addrconf_ifid_ieee1394(eui, dev); 2188 case ARPHRD_TUNNEL6: 2189 case ARPHRD_IP6GRE: 2190 return addrconf_ifid_ip6tnl(eui, dev); 2191 } 2192 return -1; 2193 } 2194 2195 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2196 { 2197 int err = -1; 2198 struct inet6_ifaddr *ifp; 2199 2200 read_lock_bh(&idev->lock); 2201 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2202 if (ifp->scope > IFA_LINK) 2203 break; 2204 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2205 memcpy(eui, ifp->addr.s6_addr+8, 8); 2206 err = 0; 2207 break; 2208 } 2209 } 2210 read_unlock_bh(&idev->lock); 2211 return err; 2212 } 2213 2214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2215 static void ipv6_regen_rndid(struct inet6_dev *idev) 2216 { 2217 regen: 2218 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2219 idev->rndid[0] &= ~0x02; 2220 2221 /* 2222 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2223 * check if generated address is not inappropriate 2224 * 2225 * - Reserved subnet anycast (RFC 2526) 2226 * 11111101 11....11 1xxxxxxx 2227 * - ISATAP (RFC4214) 6.1 2228 * 00-00-5E-FE-xx-xx-xx-xx 2229 * - value 0 2230 * - XXX: already assigned to an address on the device 2231 */ 2232 if (idev->rndid[0] == 0xfd && 2233 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2234 (idev->rndid[7]&0x80)) 2235 goto regen; 2236 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2237 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2238 goto regen; 2239 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2240 goto regen; 2241 } 2242 } 2243 2244 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2245 { 2246 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2247 ipv6_regen_rndid(idev); 2248 } 2249 2250 /* 2251 * Add prefix route. 2252 */ 2253 2254 static void 2255 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2256 unsigned long expires, u32 flags) 2257 { 2258 struct fib6_config cfg = { 2259 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2260 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2261 .fc_ifindex = dev->ifindex, 2262 .fc_expires = expires, 2263 .fc_dst_len = plen, 2264 .fc_flags = RTF_UP | flags, 2265 .fc_nlinfo.nl_net = dev_net(dev), 2266 .fc_protocol = RTPROT_KERNEL, 2267 }; 2268 2269 cfg.fc_dst = *pfx; 2270 2271 /* Prevent useless cloning on PtP SIT. 2272 This thing is done here expecting that the whole 2273 class of non-broadcast devices need not cloning. 2274 */ 2275 #if IS_ENABLED(CONFIG_IPV6_SIT) 2276 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2277 cfg.fc_flags |= RTF_NONEXTHOP; 2278 #endif 2279 2280 ip6_route_add(&cfg); 2281 } 2282 2283 2284 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2285 int plen, 2286 const struct net_device *dev, 2287 u32 flags, u32 noflags) 2288 { 2289 struct fib6_node *fn; 2290 struct rt6_info *rt = NULL; 2291 struct fib6_table *table; 2292 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2293 2294 table = fib6_get_table(dev_net(dev), tb_id); 2295 if (!table) 2296 return NULL; 2297 2298 read_lock_bh(&table->tb6_lock); 2299 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2300 if (!fn) 2301 goto out; 2302 2303 noflags |= RTF_CACHE; 2304 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2305 if (rt->dst.dev->ifindex != dev->ifindex) 2306 continue; 2307 if ((rt->rt6i_flags & flags) != flags) 2308 continue; 2309 if ((rt->rt6i_flags & noflags) != 0) 2310 continue; 2311 dst_hold(&rt->dst); 2312 break; 2313 } 2314 out: 2315 read_unlock_bh(&table->tb6_lock); 2316 return rt; 2317 } 2318 2319 2320 /* Create "default" multicast route to the interface */ 2321 2322 static void addrconf_add_mroute(struct net_device *dev) 2323 { 2324 struct fib6_config cfg = { 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2326 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2327 .fc_ifindex = dev->ifindex, 2328 .fc_dst_len = 8, 2329 .fc_flags = RTF_UP, 2330 .fc_nlinfo.nl_net = dev_net(dev), 2331 }; 2332 2333 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2334 2335 ip6_route_add(&cfg); 2336 } 2337 2338 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2339 { 2340 struct inet6_dev *idev; 2341 2342 ASSERT_RTNL(); 2343 2344 idev = ipv6_find_idev(dev); 2345 if (!idev) 2346 return ERR_PTR(-ENOBUFS); 2347 2348 if (idev->cnf.disable_ipv6) 2349 return ERR_PTR(-EACCES); 2350 2351 /* Add default multicast route */ 2352 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2353 addrconf_add_mroute(dev); 2354 2355 return idev; 2356 } 2357 2358 static void manage_tempaddrs(struct inet6_dev *idev, 2359 struct inet6_ifaddr *ifp, 2360 __u32 valid_lft, __u32 prefered_lft, 2361 bool create, unsigned long now) 2362 { 2363 u32 flags; 2364 struct inet6_ifaddr *ift; 2365 2366 read_lock_bh(&idev->lock); 2367 /* update all temporary addresses in the list */ 2368 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2369 int age, max_valid, max_prefered; 2370 2371 if (ifp != ift->ifpub) 2372 continue; 2373 2374 /* RFC 4941 section 3.3: 2375 * If a received option will extend the lifetime of a public 2376 * address, the lifetimes of temporary addresses should 2377 * be extended, subject to the overall constraint that no 2378 * temporary addresses should ever remain "valid" or "preferred" 2379 * for a time longer than (TEMP_VALID_LIFETIME) or 2380 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2381 */ 2382 age = (now - ift->cstamp) / HZ; 2383 max_valid = idev->cnf.temp_valid_lft - age; 2384 if (max_valid < 0) 2385 max_valid = 0; 2386 2387 max_prefered = idev->cnf.temp_prefered_lft - 2388 idev->desync_factor - age; 2389 if (max_prefered < 0) 2390 max_prefered = 0; 2391 2392 if (valid_lft > max_valid) 2393 valid_lft = max_valid; 2394 2395 if (prefered_lft > max_prefered) 2396 prefered_lft = max_prefered; 2397 2398 spin_lock(&ift->lock); 2399 flags = ift->flags; 2400 ift->valid_lft = valid_lft; 2401 ift->prefered_lft = prefered_lft; 2402 ift->tstamp = now; 2403 if (prefered_lft > 0) 2404 ift->flags &= ~IFA_F_DEPRECATED; 2405 2406 spin_unlock(&ift->lock); 2407 if (!(flags&IFA_F_TENTATIVE)) 2408 ipv6_ifa_notify(0, ift); 2409 } 2410 2411 if ((create || list_empty(&idev->tempaddr_list)) && 2412 idev->cnf.use_tempaddr > 0) { 2413 /* When a new public address is created as described 2414 * in [ADDRCONF], also create a new temporary address. 2415 * Also create a temporary address if it's enabled but 2416 * no temporary address currently exists. 2417 */ 2418 read_unlock_bh(&idev->lock); 2419 ipv6_create_tempaddr(ifp, NULL); 2420 } else { 2421 read_unlock_bh(&idev->lock); 2422 } 2423 } 2424 2425 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2426 { 2427 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2428 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2429 } 2430 2431 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2432 const struct prefix_info *pinfo, 2433 struct inet6_dev *in6_dev, 2434 const struct in6_addr *addr, int addr_type, 2435 u32 addr_flags, bool sllao, bool tokenized, 2436 __u32 valid_lft, u32 prefered_lft) 2437 { 2438 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2439 int create = 0, update_lft = 0; 2440 2441 if (!ifp && valid_lft) { 2442 int max_addresses = in6_dev->cnf.max_addresses; 2443 2444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2445 if (in6_dev->cnf.optimistic_dad && 2446 !net->ipv6.devconf_all->forwarding && sllao) 2447 addr_flags |= IFA_F_OPTIMISTIC; 2448 #endif 2449 2450 /* Do not allow to create too much of autoconfigured 2451 * addresses; this would be too easy way to crash kernel. 2452 */ 2453 if (!max_addresses || 2454 ipv6_count_addresses(in6_dev) < max_addresses) 2455 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2456 pinfo->prefix_len, 2457 addr_type&IPV6_ADDR_SCOPE_MASK, 2458 addr_flags, valid_lft, 2459 prefered_lft); 2460 2461 if (IS_ERR_OR_NULL(ifp)) 2462 return -1; 2463 2464 update_lft = 0; 2465 create = 1; 2466 spin_lock_bh(&ifp->lock); 2467 ifp->flags |= IFA_F_MANAGETEMPADDR; 2468 ifp->cstamp = jiffies; 2469 ifp->tokenized = tokenized; 2470 spin_unlock_bh(&ifp->lock); 2471 addrconf_dad_start(ifp); 2472 } 2473 2474 if (ifp) { 2475 u32 flags; 2476 unsigned long now; 2477 u32 stored_lft; 2478 2479 /* update lifetime (RFC2462 5.5.3 e) */ 2480 spin_lock_bh(&ifp->lock); 2481 now = jiffies; 2482 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2483 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2484 else 2485 stored_lft = 0; 2486 if (!update_lft && !create && stored_lft) { 2487 const u32 minimum_lft = min_t(u32, 2488 stored_lft, MIN_VALID_LIFETIME); 2489 valid_lft = max(valid_lft, minimum_lft); 2490 2491 /* RFC4862 Section 5.5.3e: 2492 * "Note that the preferred lifetime of the 2493 * corresponding address is always reset to 2494 * the Preferred Lifetime in the received 2495 * Prefix Information option, regardless of 2496 * whether the valid lifetime is also reset or 2497 * ignored." 2498 * 2499 * So we should always update prefered_lft here. 2500 */ 2501 update_lft = 1; 2502 } 2503 2504 if (update_lft) { 2505 ifp->valid_lft = valid_lft; 2506 ifp->prefered_lft = prefered_lft; 2507 ifp->tstamp = now; 2508 flags = ifp->flags; 2509 ifp->flags &= ~IFA_F_DEPRECATED; 2510 spin_unlock_bh(&ifp->lock); 2511 2512 if (!(flags&IFA_F_TENTATIVE)) 2513 ipv6_ifa_notify(0, ifp); 2514 } else 2515 spin_unlock_bh(&ifp->lock); 2516 2517 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2518 create, now); 2519 2520 in6_ifa_put(ifp); 2521 addrconf_verify(); 2522 } 2523 2524 return 0; 2525 } 2526 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2527 2528 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2529 { 2530 struct prefix_info *pinfo; 2531 __u32 valid_lft; 2532 __u32 prefered_lft; 2533 int addr_type, err; 2534 u32 addr_flags = 0; 2535 struct inet6_dev *in6_dev; 2536 struct net *net = dev_net(dev); 2537 2538 pinfo = (struct prefix_info *) opt; 2539 2540 if (len < sizeof(struct prefix_info)) { 2541 ADBG("addrconf: prefix option too short\n"); 2542 return; 2543 } 2544 2545 /* 2546 * Validation checks ([ADDRCONF], page 19) 2547 */ 2548 2549 addr_type = ipv6_addr_type(&pinfo->prefix); 2550 2551 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2552 return; 2553 2554 valid_lft = ntohl(pinfo->valid); 2555 prefered_lft = ntohl(pinfo->prefered); 2556 2557 if (prefered_lft > valid_lft) { 2558 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2559 return; 2560 } 2561 2562 in6_dev = in6_dev_get(dev); 2563 2564 if (!in6_dev) { 2565 net_dbg_ratelimited("addrconf: device %s not configured\n", 2566 dev->name); 2567 return; 2568 } 2569 2570 /* 2571 * Two things going on here: 2572 * 1) Add routes for on-link prefixes 2573 * 2) Configure prefixes with the auto flag set 2574 */ 2575 2576 if (pinfo->onlink) { 2577 struct rt6_info *rt; 2578 unsigned long rt_expires; 2579 2580 /* Avoid arithmetic overflow. Really, we could 2581 * save rt_expires in seconds, likely valid_lft, 2582 * but it would require division in fib gc, that it 2583 * not good. 2584 */ 2585 if (HZ > USER_HZ) 2586 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2587 else 2588 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2589 2590 if (addrconf_finite_timeout(rt_expires)) 2591 rt_expires *= HZ; 2592 2593 rt = addrconf_get_prefix_route(&pinfo->prefix, 2594 pinfo->prefix_len, 2595 dev, 2596 RTF_ADDRCONF | RTF_PREFIX_RT, 2597 RTF_GATEWAY | RTF_DEFAULT); 2598 2599 if (rt) { 2600 /* Autoconf prefix route */ 2601 if (valid_lft == 0) { 2602 ip6_del_rt(rt); 2603 rt = NULL; 2604 } else if (addrconf_finite_timeout(rt_expires)) { 2605 /* not infinity */ 2606 rt6_set_expires(rt, jiffies + rt_expires); 2607 } else { 2608 rt6_clean_expires(rt); 2609 } 2610 } else if (valid_lft) { 2611 clock_t expires = 0; 2612 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2613 if (addrconf_finite_timeout(rt_expires)) { 2614 /* not infinity */ 2615 flags |= RTF_EXPIRES; 2616 expires = jiffies_to_clock_t(rt_expires); 2617 } 2618 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2619 dev, expires, flags); 2620 } 2621 ip6_rt_put(rt); 2622 } 2623 2624 /* Try to figure out our local address for this prefix */ 2625 2626 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2627 struct in6_addr addr; 2628 bool tokenized = false, dev_addr_generated = false; 2629 2630 if (pinfo->prefix_len == 64) { 2631 memcpy(&addr, &pinfo->prefix, 8); 2632 2633 if (!ipv6_addr_any(&in6_dev->token)) { 2634 read_lock_bh(&in6_dev->lock); 2635 memcpy(addr.s6_addr + 8, 2636 in6_dev->token.s6_addr + 8, 8); 2637 read_unlock_bh(&in6_dev->lock); 2638 tokenized = true; 2639 } else if (is_addr_mode_generate_stable(in6_dev) && 2640 !ipv6_generate_stable_address(&addr, 0, 2641 in6_dev)) { 2642 addr_flags |= IFA_F_STABLE_PRIVACY; 2643 goto ok; 2644 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2645 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2646 goto put; 2647 } else { 2648 dev_addr_generated = true; 2649 } 2650 goto ok; 2651 } 2652 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2653 pinfo->prefix_len); 2654 goto put; 2655 2656 ok: 2657 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2658 &addr, addr_type, 2659 addr_flags, sllao, 2660 tokenized, valid_lft, 2661 prefered_lft); 2662 if (err) 2663 goto put; 2664 2665 /* Ignore error case here because previous prefix add addr was 2666 * successful which will be notified. 2667 */ 2668 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2669 addr_type, addr_flags, sllao, 2670 tokenized, valid_lft, 2671 prefered_lft, 2672 dev_addr_generated); 2673 } 2674 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2675 put: 2676 in6_dev_put(in6_dev); 2677 } 2678 2679 /* 2680 * Set destination address. 2681 * Special case for SIT interfaces where we create a new "virtual" 2682 * device. 2683 */ 2684 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2685 { 2686 struct in6_ifreq ireq; 2687 struct net_device *dev; 2688 int err = -EINVAL; 2689 2690 rtnl_lock(); 2691 2692 err = -EFAULT; 2693 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2694 goto err_exit; 2695 2696 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2697 2698 err = -ENODEV; 2699 if (!dev) 2700 goto err_exit; 2701 2702 #if IS_ENABLED(CONFIG_IPV6_SIT) 2703 if (dev->type == ARPHRD_SIT) { 2704 const struct net_device_ops *ops = dev->netdev_ops; 2705 struct ifreq ifr; 2706 struct ip_tunnel_parm p; 2707 2708 err = -EADDRNOTAVAIL; 2709 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2710 goto err_exit; 2711 2712 memset(&p, 0, sizeof(p)); 2713 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2714 p.iph.saddr = 0; 2715 p.iph.version = 4; 2716 p.iph.ihl = 5; 2717 p.iph.protocol = IPPROTO_IPV6; 2718 p.iph.ttl = 64; 2719 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2720 2721 if (ops->ndo_do_ioctl) { 2722 mm_segment_t oldfs = get_fs(); 2723 2724 set_fs(KERNEL_DS); 2725 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2726 set_fs(oldfs); 2727 } else 2728 err = -EOPNOTSUPP; 2729 2730 if (err == 0) { 2731 err = -ENOBUFS; 2732 dev = __dev_get_by_name(net, p.name); 2733 if (!dev) 2734 goto err_exit; 2735 err = dev_open(dev); 2736 } 2737 } 2738 #endif 2739 2740 err_exit: 2741 rtnl_unlock(); 2742 return err; 2743 } 2744 2745 static int ipv6_mc_config(struct sock *sk, bool join, 2746 const struct in6_addr *addr, int ifindex) 2747 { 2748 int ret; 2749 2750 ASSERT_RTNL(); 2751 2752 lock_sock(sk); 2753 if (join) 2754 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2755 else 2756 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2757 release_sock(sk); 2758 2759 return ret; 2760 } 2761 2762 /* 2763 * Manual configuration of address on an interface 2764 */ 2765 static int inet6_addr_add(struct net *net, int ifindex, 2766 const struct in6_addr *pfx, 2767 const struct in6_addr *peer_pfx, 2768 unsigned int plen, __u32 ifa_flags, 2769 __u32 prefered_lft, __u32 valid_lft) 2770 { 2771 struct inet6_ifaddr *ifp; 2772 struct inet6_dev *idev; 2773 struct net_device *dev; 2774 unsigned long timeout; 2775 clock_t expires; 2776 int scope; 2777 u32 flags; 2778 2779 ASSERT_RTNL(); 2780 2781 if (plen > 128) 2782 return -EINVAL; 2783 2784 /* check the lifetime */ 2785 if (!valid_lft || prefered_lft > valid_lft) 2786 return -EINVAL; 2787 2788 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2789 return -EINVAL; 2790 2791 dev = __dev_get_by_index(net, ifindex); 2792 if (!dev) 2793 return -ENODEV; 2794 2795 idev = addrconf_add_dev(dev); 2796 if (IS_ERR(idev)) 2797 return PTR_ERR(idev); 2798 2799 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2800 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2801 true, pfx, ifindex); 2802 2803 if (ret < 0) 2804 return ret; 2805 } 2806 2807 scope = ipv6_addr_scope(pfx); 2808 2809 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2810 if (addrconf_finite_timeout(timeout)) { 2811 expires = jiffies_to_clock_t(timeout * HZ); 2812 valid_lft = timeout; 2813 flags = RTF_EXPIRES; 2814 } else { 2815 expires = 0; 2816 flags = 0; 2817 ifa_flags |= IFA_F_PERMANENT; 2818 } 2819 2820 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2821 if (addrconf_finite_timeout(timeout)) { 2822 if (timeout == 0) 2823 ifa_flags |= IFA_F_DEPRECATED; 2824 prefered_lft = timeout; 2825 } 2826 2827 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2828 valid_lft, prefered_lft); 2829 2830 if (!IS_ERR(ifp)) { 2831 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2832 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2833 expires, flags); 2834 } 2835 2836 /* 2837 * Note that section 3.1 of RFC 4429 indicates 2838 * that the Optimistic flag should not be set for 2839 * manually configured addresses 2840 */ 2841 addrconf_dad_start(ifp); 2842 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2843 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2844 true, jiffies); 2845 in6_ifa_put(ifp); 2846 addrconf_verify_rtnl(); 2847 return 0; 2848 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2849 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2850 false, pfx, ifindex); 2851 } 2852 2853 return PTR_ERR(ifp); 2854 } 2855 2856 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2857 const struct in6_addr *pfx, unsigned int plen) 2858 { 2859 struct inet6_ifaddr *ifp; 2860 struct inet6_dev *idev; 2861 struct net_device *dev; 2862 2863 if (plen > 128) 2864 return -EINVAL; 2865 2866 dev = __dev_get_by_index(net, ifindex); 2867 if (!dev) 2868 return -ENODEV; 2869 2870 idev = __in6_dev_get(dev); 2871 if (!idev) 2872 return -ENXIO; 2873 2874 read_lock_bh(&idev->lock); 2875 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2876 if (ifp->prefix_len == plen && 2877 ipv6_addr_equal(pfx, &ifp->addr)) { 2878 in6_ifa_hold(ifp); 2879 read_unlock_bh(&idev->lock); 2880 2881 if (!(ifp->flags & IFA_F_TEMPORARY) && 2882 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2883 manage_tempaddrs(idev, ifp, 0, 0, false, 2884 jiffies); 2885 ipv6_del_addr(ifp); 2886 addrconf_verify_rtnl(); 2887 if (ipv6_addr_is_multicast(pfx)) { 2888 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2889 false, pfx, dev->ifindex); 2890 } 2891 return 0; 2892 } 2893 } 2894 read_unlock_bh(&idev->lock); 2895 return -EADDRNOTAVAIL; 2896 } 2897 2898 2899 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2900 { 2901 struct in6_ifreq ireq; 2902 int err; 2903 2904 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2905 return -EPERM; 2906 2907 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2908 return -EFAULT; 2909 2910 rtnl_lock(); 2911 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2912 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2913 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2914 rtnl_unlock(); 2915 return err; 2916 } 2917 2918 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2919 { 2920 struct in6_ifreq ireq; 2921 int err; 2922 2923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2924 return -EPERM; 2925 2926 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2927 return -EFAULT; 2928 2929 rtnl_lock(); 2930 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2931 ireq.ifr6_prefixlen); 2932 rtnl_unlock(); 2933 return err; 2934 } 2935 2936 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2937 int plen, int scope) 2938 { 2939 struct inet6_ifaddr *ifp; 2940 2941 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2942 scope, IFA_F_PERMANENT, 2943 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2944 if (!IS_ERR(ifp)) { 2945 spin_lock_bh(&ifp->lock); 2946 ifp->flags &= ~IFA_F_TENTATIVE; 2947 spin_unlock_bh(&ifp->lock); 2948 rt_genid_bump_ipv6(dev_net(idev->dev)); 2949 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2950 in6_ifa_put(ifp); 2951 } 2952 } 2953 2954 #if IS_ENABLED(CONFIG_IPV6_SIT) 2955 static void sit_add_v4_addrs(struct inet6_dev *idev) 2956 { 2957 struct in6_addr addr; 2958 struct net_device *dev; 2959 struct net *net = dev_net(idev->dev); 2960 int scope, plen; 2961 u32 pflags = 0; 2962 2963 ASSERT_RTNL(); 2964 2965 memset(&addr, 0, sizeof(struct in6_addr)); 2966 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2967 2968 if (idev->dev->flags&IFF_POINTOPOINT) { 2969 addr.s6_addr32[0] = htonl(0xfe800000); 2970 scope = IFA_LINK; 2971 plen = 64; 2972 } else { 2973 scope = IPV6_ADDR_COMPATv4; 2974 plen = 96; 2975 pflags |= RTF_NONEXTHOP; 2976 } 2977 2978 if (addr.s6_addr32[3]) { 2979 add_addr(idev, &addr, plen, scope); 2980 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2981 return; 2982 } 2983 2984 for_each_netdev(net, dev) { 2985 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2986 if (in_dev && (dev->flags & IFF_UP)) { 2987 struct in_ifaddr *ifa; 2988 2989 int flag = scope; 2990 2991 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2992 2993 addr.s6_addr32[3] = ifa->ifa_local; 2994 2995 if (ifa->ifa_scope == RT_SCOPE_LINK) 2996 continue; 2997 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2998 if (idev->dev->flags&IFF_POINTOPOINT) 2999 continue; 3000 flag |= IFA_HOST; 3001 } 3002 3003 add_addr(idev, &addr, plen, flag); 3004 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3005 pflags); 3006 } 3007 } 3008 } 3009 } 3010 #endif 3011 3012 static void init_loopback(struct net_device *dev) 3013 { 3014 struct inet6_dev *idev; 3015 struct net_device *sp_dev; 3016 struct inet6_ifaddr *sp_ifa; 3017 struct rt6_info *sp_rt; 3018 3019 /* ::1 */ 3020 3021 ASSERT_RTNL(); 3022 3023 idev = ipv6_find_idev(dev); 3024 if (!idev) { 3025 pr_debug("%s: add_dev failed\n", __func__); 3026 return; 3027 } 3028 3029 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3030 3031 /* Add routes to other interface's IPv6 addresses */ 3032 for_each_netdev(dev_net(dev), sp_dev) { 3033 if (!strcmp(sp_dev->name, dev->name)) 3034 continue; 3035 3036 idev = __in6_dev_get(sp_dev); 3037 if (!idev) 3038 continue; 3039 3040 read_lock_bh(&idev->lock); 3041 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3042 3043 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3044 continue; 3045 3046 if (sp_ifa->rt) { 3047 /* This dst has been added to garbage list when 3048 * lo device down, release this obsolete dst and 3049 * reallocate a new router for ifa. 3050 */ 3051 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3052 ip6_rt_put(sp_ifa->rt); 3053 sp_ifa->rt = NULL; 3054 } else { 3055 continue; 3056 } 3057 } 3058 3059 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3060 3061 /* Failure cases are ignored */ 3062 if (!IS_ERR(sp_rt)) { 3063 sp_ifa->rt = sp_rt; 3064 ip6_ins_rt(sp_rt); 3065 } 3066 } 3067 read_unlock_bh(&idev->lock); 3068 } 3069 } 3070 3071 void addrconf_add_linklocal(struct inet6_dev *idev, 3072 const struct in6_addr *addr, u32 flags) 3073 { 3074 struct inet6_ifaddr *ifp; 3075 u32 addr_flags = flags | IFA_F_PERMANENT; 3076 3077 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3078 if (idev->cnf.optimistic_dad && 3079 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3080 addr_flags |= IFA_F_OPTIMISTIC; 3081 #endif 3082 3083 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3084 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3085 if (!IS_ERR(ifp)) { 3086 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3087 addrconf_dad_start(ifp); 3088 in6_ifa_put(ifp); 3089 } 3090 } 3091 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3092 3093 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3094 { 3095 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3096 return true; 3097 3098 if (address.s6_addr32[2] == htonl(0x02005eff) && 3099 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3100 return true; 3101 3102 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3103 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3104 return true; 3105 3106 return false; 3107 } 3108 3109 static int ipv6_generate_stable_address(struct in6_addr *address, 3110 u8 dad_count, 3111 const struct inet6_dev *idev) 3112 { 3113 static DEFINE_SPINLOCK(lock); 3114 static __u32 digest[SHA_DIGEST_WORDS]; 3115 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3116 3117 static union { 3118 char __data[SHA_MESSAGE_BYTES]; 3119 struct { 3120 struct in6_addr secret; 3121 __be32 prefix[2]; 3122 unsigned char hwaddr[MAX_ADDR_LEN]; 3123 u8 dad_count; 3124 } __packed; 3125 } data; 3126 3127 struct in6_addr secret; 3128 struct in6_addr temp; 3129 struct net *net = dev_net(idev->dev); 3130 3131 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3132 3133 if (idev->cnf.stable_secret.initialized) 3134 secret = idev->cnf.stable_secret.secret; 3135 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3136 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3137 else 3138 return -1; 3139 3140 retry: 3141 spin_lock_bh(&lock); 3142 3143 sha_init(digest); 3144 memset(&data, 0, sizeof(data)); 3145 memset(workspace, 0, sizeof(workspace)); 3146 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3147 data.prefix[0] = address->s6_addr32[0]; 3148 data.prefix[1] = address->s6_addr32[1]; 3149 data.secret = secret; 3150 data.dad_count = dad_count; 3151 3152 sha_transform(digest, data.__data, workspace); 3153 3154 temp = *address; 3155 temp.s6_addr32[2] = (__force __be32)digest[0]; 3156 temp.s6_addr32[3] = (__force __be32)digest[1]; 3157 3158 spin_unlock_bh(&lock); 3159 3160 if (ipv6_reserved_interfaceid(temp)) { 3161 dad_count++; 3162 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3163 return -1; 3164 goto retry; 3165 } 3166 3167 *address = temp; 3168 return 0; 3169 } 3170 3171 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3172 { 3173 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3174 3175 if (s->initialized) 3176 return; 3177 s = &idev->cnf.stable_secret; 3178 get_random_bytes(&s->secret, sizeof(s->secret)); 3179 s->initialized = true; 3180 } 3181 3182 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3183 { 3184 struct in6_addr addr; 3185 3186 /* no link local addresses on L3 master devices */ 3187 if (netif_is_l3_master(idev->dev)) 3188 return; 3189 3190 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3191 3192 switch (idev->cnf.addr_gen_mode) { 3193 case IN6_ADDR_GEN_MODE_RANDOM: 3194 ipv6_gen_mode_random_init(idev); 3195 /* fallthrough */ 3196 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3197 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3198 addrconf_add_linklocal(idev, &addr, 3199 IFA_F_STABLE_PRIVACY); 3200 else if (prefix_route) 3201 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3202 break; 3203 case IN6_ADDR_GEN_MODE_EUI64: 3204 /* addrconf_add_linklocal also adds a prefix_route and we 3205 * only need to care about prefix routes if ipv6_generate_eui64 3206 * couldn't generate one. 3207 */ 3208 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3209 addrconf_add_linklocal(idev, &addr, 0); 3210 else if (prefix_route) 3211 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3212 break; 3213 case IN6_ADDR_GEN_MODE_NONE: 3214 default: 3215 /* will not add any link local address */ 3216 break; 3217 } 3218 } 3219 3220 static void addrconf_dev_config(struct net_device *dev) 3221 { 3222 struct inet6_dev *idev; 3223 3224 ASSERT_RTNL(); 3225 3226 if ((dev->type != ARPHRD_ETHER) && 3227 (dev->type != ARPHRD_FDDI) && 3228 (dev->type != ARPHRD_ARCNET) && 3229 (dev->type != ARPHRD_INFINIBAND) && 3230 (dev->type != ARPHRD_IEEE1394) && 3231 (dev->type != ARPHRD_TUNNEL6) && 3232 (dev->type != ARPHRD_6LOWPAN) && 3233 (dev->type != ARPHRD_IP6GRE) && 3234 (dev->type != ARPHRD_IPGRE) && 3235 (dev->type != ARPHRD_TUNNEL) && 3236 (dev->type != ARPHRD_NONE)) { 3237 /* Alas, we support only Ethernet autoconfiguration. */ 3238 return; 3239 } 3240 3241 idev = addrconf_add_dev(dev); 3242 if (IS_ERR(idev)) 3243 return; 3244 3245 /* this device type has no EUI support */ 3246 if (dev->type == ARPHRD_NONE && 3247 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3248 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3249 3250 addrconf_addr_gen(idev, false); 3251 } 3252 3253 #if IS_ENABLED(CONFIG_IPV6_SIT) 3254 static void addrconf_sit_config(struct net_device *dev) 3255 { 3256 struct inet6_dev *idev; 3257 3258 ASSERT_RTNL(); 3259 3260 /* 3261 * Configure the tunnel with one of our IPv4 3262 * addresses... we should configure all of 3263 * our v4 addrs in the tunnel 3264 */ 3265 3266 idev = ipv6_find_idev(dev); 3267 if (!idev) { 3268 pr_debug("%s: add_dev failed\n", __func__); 3269 return; 3270 } 3271 3272 if (dev->priv_flags & IFF_ISATAP) { 3273 addrconf_addr_gen(idev, false); 3274 return; 3275 } 3276 3277 sit_add_v4_addrs(idev); 3278 3279 if (dev->flags&IFF_POINTOPOINT) 3280 addrconf_add_mroute(dev); 3281 } 3282 #endif 3283 3284 #if IS_ENABLED(CONFIG_NET_IPGRE) 3285 static void addrconf_gre_config(struct net_device *dev) 3286 { 3287 struct inet6_dev *idev; 3288 3289 ASSERT_RTNL(); 3290 3291 idev = ipv6_find_idev(dev); 3292 if (!idev) { 3293 pr_debug("%s: add_dev failed\n", __func__); 3294 return; 3295 } 3296 3297 addrconf_addr_gen(idev, true); 3298 if (dev->flags & IFF_POINTOPOINT) 3299 addrconf_add_mroute(dev); 3300 } 3301 #endif 3302 3303 static int fixup_permanent_addr(struct inet6_dev *idev, 3304 struct inet6_ifaddr *ifp) 3305 { 3306 /* rt6i_ref == 0 means the host route was removed from the 3307 * FIB, for example, if 'lo' device is taken down. In that 3308 * case regenerate the host route. 3309 */ 3310 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) { 3311 struct rt6_info *rt, *prev; 3312 3313 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3314 if (unlikely(IS_ERR(rt))) 3315 return PTR_ERR(rt); 3316 3317 /* ifp->rt can be accessed outside of rtnl */ 3318 spin_lock(&ifp->lock); 3319 prev = ifp->rt; 3320 ifp->rt = rt; 3321 spin_unlock(&ifp->lock); 3322 3323 ip6_rt_put(prev); 3324 } 3325 3326 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3327 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3328 idev->dev, 0, 0); 3329 } 3330 3331 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3332 addrconf_dad_start(ifp); 3333 3334 return 0; 3335 } 3336 3337 static void addrconf_permanent_addr(struct net_device *dev) 3338 { 3339 struct inet6_ifaddr *ifp, *tmp; 3340 struct inet6_dev *idev; 3341 3342 idev = __in6_dev_get(dev); 3343 if (!idev) 3344 return; 3345 3346 write_lock_bh(&idev->lock); 3347 3348 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3349 if ((ifp->flags & IFA_F_PERMANENT) && 3350 fixup_permanent_addr(idev, ifp) < 0) { 3351 write_unlock_bh(&idev->lock); 3352 ipv6_del_addr(ifp); 3353 write_lock_bh(&idev->lock); 3354 3355 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3356 idev->dev->name, &ifp->addr); 3357 } 3358 } 3359 3360 write_unlock_bh(&idev->lock); 3361 } 3362 3363 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3364 void *ptr) 3365 { 3366 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3367 struct netdev_notifier_changeupper_info *info; 3368 struct inet6_dev *idev = __in6_dev_get(dev); 3369 int run_pending = 0; 3370 int err; 3371 3372 switch (event) { 3373 case NETDEV_REGISTER: 3374 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3375 idev = ipv6_add_dev(dev); 3376 if (IS_ERR(idev)) 3377 return notifier_from_errno(PTR_ERR(idev)); 3378 } 3379 break; 3380 3381 case NETDEV_CHANGEMTU: 3382 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3383 if (dev->mtu < IPV6_MIN_MTU) { 3384 addrconf_ifdown(dev, 1); 3385 break; 3386 } 3387 3388 if (idev) { 3389 rt6_mtu_change(dev, dev->mtu); 3390 idev->cnf.mtu6 = dev->mtu; 3391 break; 3392 } 3393 3394 /* allocate new idev */ 3395 idev = ipv6_add_dev(dev); 3396 if (IS_ERR(idev)) 3397 break; 3398 3399 /* device is still not ready */ 3400 if (!(idev->if_flags & IF_READY)) 3401 break; 3402 3403 run_pending = 1; 3404 3405 /* fall through */ 3406 3407 case NETDEV_UP: 3408 case NETDEV_CHANGE: 3409 if (dev->flags & IFF_SLAVE) 3410 break; 3411 3412 if (idev && idev->cnf.disable_ipv6) 3413 break; 3414 3415 if (event == NETDEV_UP) { 3416 /* restore routes for permanent addresses */ 3417 addrconf_permanent_addr(dev); 3418 3419 if (!addrconf_qdisc_ok(dev)) { 3420 /* device is not ready yet. */ 3421 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3422 dev->name); 3423 break; 3424 } 3425 3426 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3427 idev = ipv6_add_dev(dev); 3428 3429 if (!IS_ERR_OR_NULL(idev)) { 3430 idev->if_flags |= IF_READY; 3431 run_pending = 1; 3432 } 3433 } else if (event == NETDEV_CHANGE) { 3434 if (!addrconf_qdisc_ok(dev)) { 3435 /* device is still not ready. */ 3436 break; 3437 } 3438 3439 if (idev) { 3440 if (idev->if_flags & IF_READY) { 3441 /* device is already configured - 3442 * but resend MLD reports, we might 3443 * have roamed and need to update 3444 * multicast snooping switches 3445 */ 3446 ipv6_mc_up(idev); 3447 break; 3448 } 3449 idev->if_flags |= IF_READY; 3450 } 3451 3452 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3453 dev->name); 3454 3455 run_pending = 1; 3456 } 3457 3458 switch (dev->type) { 3459 #if IS_ENABLED(CONFIG_IPV6_SIT) 3460 case ARPHRD_SIT: 3461 addrconf_sit_config(dev); 3462 break; 3463 #endif 3464 #if IS_ENABLED(CONFIG_NET_IPGRE) 3465 case ARPHRD_IPGRE: 3466 addrconf_gre_config(dev); 3467 break; 3468 #endif 3469 case ARPHRD_LOOPBACK: 3470 init_loopback(dev); 3471 break; 3472 3473 default: 3474 addrconf_dev_config(dev); 3475 break; 3476 } 3477 3478 if (!IS_ERR_OR_NULL(idev)) { 3479 if (run_pending) 3480 addrconf_dad_run(idev); 3481 3482 /* 3483 * If the MTU changed during the interface down, 3484 * when the interface up, the changed MTU must be 3485 * reflected in the idev as well as routers. 3486 */ 3487 if (idev->cnf.mtu6 != dev->mtu && 3488 dev->mtu >= IPV6_MIN_MTU) { 3489 rt6_mtu_change(dev, dev->mtu); 3490 idev->cnf.mtu6 = dev->mtu; 3491 } 3492 idev->tstamp = jiffies; 3493 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3494 3495 /* 3496 * If the changed mtu during down is lower than 3497 * IPV6_MIN_MTU stop IPv6 on this interface. 3498 */ 3499 if (dev->mtu < IPV6_MIN_MTU) 3500 addrconf_ifdown(dev, 1); 3501 } 3502 break; 3503 3504 case NETDEV_DOWN: 3505 case NETDEV_UNREGISTER: 3506 /* 3507 * Remove all addresses from this interface. 3508 */ 3509 addrconf_ifdown(dev, event != NETDEV_DOWN); 3510 break; 3511 3512 case NETDEV_CHANGENAME: 3513 if (idev) { 3514 snmp6_unregister_dev(idev); 3515 addrconf_sysctl_unregister(idev); 3516 err = addrconf_sysctl_register(idev); 3517 if (err) 3518 return notifier_from_errno(err); 3519 err = snmp6_register_dev(idev); 3520 if (err) { 3521 addrconf_sysctl_unregister(idev); 3522 return notifier_from_errno(err); 3523 } 3524 } 3525 break; 3526 3527 case NETDEV_PRE_TYPE_CHANGE: 3528 case NETDEV_POST_TYPE_CHANGE: 3529 if (idev) 3530 addrconf_type_change(dev, event); 3531 break; 3532 3533 case NETDEV_CHANGEUPPER: 3534 info = ptr; 3535 3536 /* flush all routes if dev is linked to or unlinked from 3537 * an L3 master device (e.g., VRF) 3538 */ 3539 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3540 addrconf_ifdown(dev, 0); 3541 } 3542 3543 return NOTIFY_OK; 3544 } 3545 3546 /* 3547 * addrconf module should be notified of a device going up 3548 */ 3549 static struct notifier_block ipv6_dev_notf = { 3550 .notifier_call = addrconf_notify, 3551 }; 3552 3553 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3554 { 3555 struct inet6_dev *idev; 3556 ASSERT_RTNL(); 3557 3558 idev = __in6_dev_get(dev); 3559 3560 if (event == NETDEV_POST_TYPE_CHANGE) 3561 ipv6_mc_remap(idev); 3562 else if (event == NETDEV_PRE_TYPE_CHANGE) 3563 ipv6_mc_unmap(idev); 3564 } 3565 3566 static bool addr_is_local(const struct in6_addr *addr) 3567 { 3568 return ipv6_addr_type(addr) & 3569 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3570 } 3571 3572 static int addrconf_ifdown(struct net_device *dev, int how) 3573 { 3574 struct net *net = dev_net(dev); 3575 struct inet6_dev *idev; 3576 struct inet6_ifaddr *ifa, *tmp; 3577 struct list_head del_list; 3578 int _keep_addr; 3579 bool keep_addr; 3580 int state, i; 3581 3582 ASSERT_RTNL(); 3583 3584 rt6_ifdown(net, dev); 3585 neigh_ifdown(&nd_tbl, dev); 3586 3587 idev = __in6_dev_get(dev); 3588 if (!idev) 3589 return -ENODEV; 3590 3591 /* 3592 * Step 1: remove reference to ipv6 device from parent device. 3593 * Do not dev_put! 3594 */ 3595 if (how) { 3596 idev->dead = 1; 3597 3598 /* protected by rtnl_lock */ 3599 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3600 3601 /* Step 1.5: remove snmp6 entry */ 3602 snmp6_unregister_dev(idev); 3603 3604 } 3605 3606 /* aggregate the system setting and interface setting */ 3607 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3608 if (!_keep_addr) 3609 _keep_addr = idev->cnf.keep_addr_on_down; 3610 3611 /* combine the user config with event to determine if permanent 3612 * addresses are to be removed from address hash table 3613 */ 3614 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3615 3616 /* Step 2: clear hash table */ 3617 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3618 struct hlist_head *h = &inet6_addr_lst[i]; 3619 3620 spin_lock_bh(&addrconf_hash_lock); 3621 restart: 3622 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3623 if (ifa->idev == idev) { 3624 addrconf_del_dad_work(ifa); 3625 /* combined flag + permanent flag decide if 3626 * address is retained on a down event 3627 */ 3628 if (!keep_addr || 3629 !(ifa->flags & IFA_F_PERMANENT) || 3630 addr_is_local(&ifa->addr)) { 3631 hlist_del_init_rcu(&ifa->addr_lst); 3632 goto restart; 3633 } 3634 } 3635 } 3636 spin_unlock_bh(&addrconf_hash_lock); 3637 } 3638 3639 write_lock_bh(&idev->lock); 3640 3641 addrconf_del_rs_timer(idev); 3642 3643 /* Step 2: clear flags for stateless addrconf */ 3644 if (!how) 3645 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3646 3647 /* Step 3: clear tempaddr list */ 3648 while (!list_empty(&idev->tempaddr_list)) { 3649 ifa = list_first_entry(&idev->tempaddr_list, 3650 struct inet6_ifaddr, tmp_list); 3651 list_del(&ifa->tmp_list); 3652 write_unlock_bh(&idev->lock); 3653 spin_lock_bh(&ifa->lock); 3654 3655 if (ifa->ifpub) { 3656 in6_ifa_put(ifa->ifpub); 3657 ifa->ifpub = NULL; 3658 } 3659 spin_unlock_bh(&ifa->lock); 3660 in6_ifa_put(ifa); 3661 write_lock_bh(&idev->lock); 3662 } 3663 3664 /* re-combine the user config with event to determine if permanent 3665 * addresses are to be removed from the interface list 3666 */ 3667 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3668 3669 INIT_LIST_HEAD(&del_list); 3670 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3671 struct rt6_info *rt = NULL; 3672 bool keep; 3673 3674 addrconf_del_dad_work(ifa); 3675 3676 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3677 !addr_is_local(&ifa->addr); 3678 if (!keep) 3679 list_move(&ifa->if_list, &del_list); 3680 3681 write_unlock_bh(&idev->lock); 3682 spin_lock_bh(&ifa->lock); 3683 3684 if (keep) { 3685 /* set state to skip the notifier below */ 3686 state = INET6_IFADDR_STATE_DEAD; 3687 ifa->state = INET6_IFADDR_STATE_PREDAD; 3688 if (!(ifa->flags & IFA_F_NODAD)) 3689 ifa->flags |= IFA_F_TENTATIVE; 3690 3691 rt = ifa->rt; 3692 ifa->rt = NULL; 3693 } else { 3694 state = ifa->state; 3695 ifa->state = INET6_IFADDR_STATE_DEAD; 3696 } 3697 3698 spin_unlock_bh(&ifa->lock); 3699 3700 if (rt) 3701 ip6_del_rt(rt); 3702 3703 if (state != INET6_IFADDR_STATE_DEAD) { 3704 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3705 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3706 } else { 3707 if (idev->cnf.forwarding) 3708 addrconf_leave_anycast(ifa); 3709 addrconf_leave_solict(ifa->idev, &ifa->addr); 3710 } 3711 3712 write_lock_bh(&idev->lock); 3713 } 3714 3715 write_unlock_bh(&idev->lock); 3716 3717 /* now clean up addresses to be removed */ 3718 while (!list_empty(&del_list)) { 3719 ifa = list_first_entry(&del_list, 3720 struct inet6_ifaddr, if_list); 3721 list_del(&ifa->if_list); 3722 3723 in6_ifa_put(ifa); 3724 } 3725 3726 /* Step 5: Discard anycast and multicast list */ 3727 if (how) { 3728 ipv6_ac_destroy_dev(idev); 3729 ipv6_mc_destroy_dev(idev); 3730 } else { 3731 ipv6_mc_down(idev); 3732 } 3733 3734 idev->tstamp = jiffies; 3735 3736 /* Last: Shot the device (if unregistered) */ 3737 if (how) { 3738 addrconf_sysctl_unregister(idev); 3739 neigh_parms_release(&nd_tbl, idev->nd_parms); 3740 neigh_ifdown(&nd_tbl, dev); 3741 in6_dev_put(idev); 3742 } 3743 return 0; 3744 } 3745 3746 static void addrconf_rs_timer(unsigned long data) 3747 { 3748 struct inet6_dev *idev = (struct inet6_dev *)data; 3749 struct net_device *dev = idev->dev; 3750 struct in6_addr lladdr; 3751 3752 write_lock(&idev->lock); 3753 if (idev->dead || !(idev->if_flags & IF_READY)) 3754 goto out; 3755 3756 if (!ipv6_accept_ra(idev)) 3757 goto out; 3758 3759 /* Announcement received after solicitation was sent */ 3760 if (idev->if_flags & IF_RA_RCVD) 3761 goto out; 3762 3763 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3764 write_unlock(&idev->lock); 3765 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3766 ndisc_send_rs(dev, &lladdr, 3767 &in6addr_linklocal_allrouters); 3768 else 3769 goto put; 3770 3771 write_lock(&idev->lock); 3772 idev->rs_interval = rfc3315_s14_backoff_update( 3773 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3774 /* The wait after the last probe can be shorter */ 3775 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3776 idev->cnf.rtr_solicits) ? 3777 idev->cnf.rtr_solicit_delay : 3778 idev->rs_interval); 3779 } else { 3780 /* 3781 * Note: we do not support deprecated "all on-link" 3782 * assumption any longer. 3783 */ 3784 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3785 } 3786 3787 out: 3788 write_unlock(&idev->lock); 3789 put: 3790 in6_dev_put(idev); 3791 } 3792 3793 /* 3794 * Duplicate Address Detection 3795 */ 3796 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3797 { 3798 unsigned long rand_num; 3799 struct inet6_dev *idev = ifp->idev; 3800 u64 nonce; 3801 3802 if (ifp->flags & IFA_F_OPTIMISTIC) 3803 rand_num = 0; 3804 else 3805 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3806 3807 nonce = 0; 3808 if (idev->cnf.enhanced_dad || 3809 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3810 do 3811 get_random_bytes(&nonce, 6); 3812 while (nonce == 0); 3813 } 3814 ifp->dad_nonce = nonce; 3815 ifp->dad_probes = idev->cnf.dad_transmits; 3816 addrconf_mod_dad_work(ifp, rand_num); 3817 } 3818 3819 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3820 { 3821 struct inet6_dev *idev = ifp->idev; 3822 struct net_device *dev = idev->dev; 3823 bool bump_id, notify = false; 3824 3825 addrconf_join_solict(dev, &ifp->addr); 3826 3827 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3828 3829 read_lock_bh(&idev->lock); 3830 spin_lock(&ifp->lock); 3831 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3832 goto out; 3833 3834 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3835 idev->cnf.accept_dad < 1 || 3836 !(ifp->flags&IFA_F_TENTATIVE) || 3837 ifp->flags & IFA_F_NODAD) { 3838 bump_id = ifp->flags & IFA_F_TENTATIVE; 3839 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3840 spin_unlock(&ifp->lock); 3841 read_unlock_bh(&idev->lock); 3842 3843 addrconf_dad_completed(ifp, bump_id); 3844 return; 3845 } 3846 3847 if (!(idev->if_flags & IF_READY)) { 3848 spin_unlock(&ifp->lock); 3849 read_unlock_bh(&idev->lock); 3850 /* 3851 * If the device is not ready: 3852 * - keep it tentative if it is a permanent address. 3853 * - otherwise, kill it. 3854 */ 3855 in6_ifa_hold(ifp); 3856 addrconf_dad_stop(ifp, 0); 3857 return; 3858 } 3859 3860 /* 3861 * Optimistic nodes can start receiving 3862 * Frames right away 3863 */ 3864 if (ifp->flags & IFA_F_OPTIMISTIC) { 3865 ip6_ins_rt(ifp->rt); 3866 if (ipv6_use_optimistic_addr(idev)) { 3867 /* Because optimistic nodes can use this address, 3868 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3869 */ 3870 notify = true; 3871 } 3872 } 3873 3874 addrconf_dad_kick(ifp); 3875 out: 3876 spin_unlock(&ifp->lock); 3877 read_unlock_bh(&idev->lock); 3878 if (notify) 3879 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3880 } 3881 3882 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3883 { 3884 bool begin_dad = false; 3885 3886 spin_lock_bh(&ifp->lock); 3887 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3888 ifp->state = INET6_IFADDR_STATE_PREDAD; 3889 begin_dad = true; 3890 } 3891 spin_unlock_bh(&ifp->lock); 3892 3893 if (begin_dad) 3894 addrconf_mod_dad_work(ifp, 0); 3895 } 3896 3897 static void addrconf_dad_work(struct work_struct *w) 3898 { 3899 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3900 struct inet6_ifaddr, 3901 dad_work); 3902 struct inet6_dev *idev = ifp->idev; 3903 bool bump_id, disable_ipv6 = false; 3904 struct in6_addr mcaddr; 3905 3906 enum { 3907 DAD_PROCESS, 3908 DAD_BEGIN, 3909 DAD_ABORT, 3910 } action = DAD_PROCESS; 3911 3912 rtnl_lock(); 3913 3914 spin_lock_bh(&ifp->lock); 3915 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3916 action = DAD_BEGIN; 3917 ifp->state = INET6_IFADDR_STATE_DAD; 3918 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3919 action = DAD_ABORT; 3920 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3921 3922 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3923 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3924 struct in6_addr addr; 3925 3926 addr.s6_addr32[0] = htonl(0xfe800000); 3927 addr.s6_addr32[1] = 0; 3928 3929 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3930 ipv6_addr_equal(&ifp->addr, &addr)) { 3931 /* DAD failed for link-local based on MAC */ 3932 idev->cnf.disable_ipv6 = 1; 3933 3934 pr_info("%s: IPv6 being disabled!\n", 3935 ifp->idev->dev->name); 3936 disable_ipv6 = true; 3937 } 3938 } 3939 } 3940 spin_unlock_bh(&ifp->lock); 3941 3942 if (action == DAD_BEGIN) { 3943 addrconf_dad_begin(ifp); 3944 goto out; 3945 } else if (action == DAD_ABORT) { 3946 in6_ifa_hold(ifp); 3947 addrconf_dad_stop(ifp, 1); 3948 if (disable_ipv6) 3949 addrconf_ifdown(idev->dev, 0); 3950 goto out; 3951 } 3952 3953 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3954 goto out; 3955 3956 write_lock_bh(&idev->lock); 3957 if (idev->dead || !(idev->if_flags & IF_READY)) { 3958 write_unlock_bh(&idev->lock); 3959 goto out; 3960 } 3961 3962 spin_lock(&ifp->lock); 3963 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3964 spin_unlock(&ifp->lock); 3965 write_unlock_bh(&idev->lock); 3966 goto out; 3967 } 3968 3969 if (ifp->dad_probes == 0) { 3970 /* 3971 * DAD was successful 3972 */ 3973 3974 bump_id = ifp->flags & IFA_F_TENTATIVE; 3975 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3976 spin_unlock(&ifp->lock); 3977 write_unlock_bh(&idev->lock); 3978 3979 addrconf_dad_completed(ifp, bump_id); 3980 3981 goto out; 3982 } 3983 3984 ifp->dad_probes--; 3985 addrconf_mod_dad_work(ifp, 3986 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3987 spin_unlock(&ifp->lock); 3988 write_unlock_bh(&idev->lock); 3989 3990 /* send a neighbour solicitation for our addr */ 3991 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3992 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3993 ifp->dad_nonce); 3994 out: 3995 in6_ifa_put(ifp); 3996 rtnl_unlock(); 3997 } 3998 3999 /* ifp->idev must be at least read locked */ 4000 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4001 { 4002 struct inet6_ifaddr *ifpiter; 4003 struct inet6_dev *idev = ifp->idev; 4004 4005 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4006 if (ifpiter->scope > IFA_LINK) 4007 break; 4008 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4009 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4010 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4011 IFA_F_PERMANENT) 4012 return false; 4013 } 4014 return true; 4015 } 4016 4017 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4018 { 4019 struct net_device *dev = ifp->idev->dev; 4020 struct in6_addr lladdr; 4021 bool send_rs, send_mld; 4022 4023 addrconf_del_dad_work(ifp); 4024 4025 /* 4026 * Configure the address for reception. Now it is valid. 4027 */ 4028 4029 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4030 4031 /* If added prefix is link local and we are prepared to process 4032 router advertisements, start sending router solicitations. 4033 */ 4034 4035 read_lock_bh(&ifp->idev->lock); 4036 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4037 send_rs = send_mld && 4038 ipv6_accept_ra(ifp->idev) && 4039 ifp->idev->cnf.rtr_solicits != 0 && 4040 (dev->flags&IFF_LOOPBACK) == 0; 4041 read_unlock_bh(&ifp->idev->lock); 4042 4043 /* While dad is in progress mld report's source address is in6_addrany. 4044 * Resend with proper ll now. 4045 */ 4046 if (send_mld) 4047 ipv6_mc_dad_complete(ifp->idev); 4048 4049 if (send_rs) { 4050 /* 4051 * If a host as already performed a random delay 4052 * [...] as part of DAD [...] there is no need 4053 * to delay again before sending the first RS 4054 */ 4055 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4056 return; 4057 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4058 4059 write_lock_bh(&ifp->idev->lock); 4060 spin_lock(&ifp->lock); 4061 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4062 ifp->idev->cnf.rtr_solicit_interval); 4063 ifp->idev->rs_probes = 1; 4064 ifp->idev->if_flags |= IF_RS_SENT; 4065 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4066 spin_unlock(&ifp->lock); 4067 write_unlock_bh(&ifp->idev->lock); 4068 } 4069 4070 if (bump_id) 4071 rt_genid_bump_ipv6(dev_net(dev)); 4072 4073 /* Make sure that a new temporary address will be created 4074 * before this temporary address becomes deprecated. 4075 */ 4076 if (ifp->flags & IFA_F_TEMPORARY) 4077 addrconf_verify_rtnl(); 4078 } 4079 4080 static void addrconf_dad_run(struct inet6_dev *idev) 4081 { 4082 struct inet6_ifaddr *ifp; 4083 4084 read_lock_bh(&idev->lock); 4085 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4086 spin_lock(&ifp->lock); 4087 if (ifp->flags & IFA_F_TENTATIVE && 4088 ifp->state == INET6_IFADDR_STATE_DAD) 4089 addrconf_dad_kick(ifp); 4090 spin_unlock(&ifp->lock); 4091 } 4092 read_unlock_bh(&idev->lock); 4093 } 4094 4095 #ifdef CONFIG_PROC_FS 4096 struct if6_iter_state { 4097 struct seq_net_private p; 4098 int bucket; 4099 int offset; 4100 }; 4101 4102 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4103 { 4104 struct inet6_ifaddr *ifa = NULL; 4105 struct if6_iter_state *state = seq->private; 4106 struct net *net = seq_file_net(seq); 4107 int p = 0; 4108 4109 /* initial bucket if pos is 0 */ 4110 if (pos == 0) { 4111 state->bucket = 0; 4112 state->offset = 0; 4113 } 4114 4115 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4116 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4117 addr_lst) { 4118 if (!net_eq(dev_net(ifa->idev->dev), net)) 4119 continue; 4120 /* sync with offset */ 4121 if (p < state->offset) { 4122 p++; 4123 continue; 4124 } 4125 state->offset++; 4126 return ifa; 4127 } 4128 4129 /* prepare for next bucket */ 4130 state->offset = 0; 4131 p = 0; 4132 } 4133 return NULL; 4134 } 4135 4136 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4137 struct inet6_ifaddr *ifa) 4138 { 4139 struct if6_iter_state *state = seq->private; 4140 struct net *net = seq_file_net(seq); 4141 4142 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4143 if (!net_eq(dev_net(ifa->idev->dev), net)) 4144 continue; 4145 state->offset++; 4146 return ifa; 4147 } 4148 4149 while (++state->bucket < IN6_ADDR_HSIZE) { 4150 state->offset = 0; 4151 hlist_for_each_entry_rcu_bh(ifa, 4152 &inet6_addr_lst[state->bucket], addr_lst) { 4153 if (!net_eq(dev_net(ifa->idev->dev), net)) 4154 continue; 4155 state->offset++; 4156 return ifa; 4157 } 4158 } 4159 4160 return NULL; 4161 } 4162 4163 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4164 __acquires(rcu_bh) 4165 { 4166 rcu_read_lock_bh(); 4167 return if6_get_first(seq, *pos); 4168 } 4169 4170 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4171 { 4172 struct inet6_ifaddr *ifa; 4173 4174 ifa = if6_get_next(seq, v); 4175 ++*pos; 4176 return ifa; 4177 } 4178 4179 static void if6_seq_stop(struct seq_file *seq, void *v) 4180 __releases(rcu_bh) 4181 { 4182 rcu_read_unlock_bh(); 4183 } 4184 4185 static int if6_seq_show(struct seq_file *seq, void *v) 4186 { 4187 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4188 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4189 &ifp->addr, 4190 ifp->idev->dev->ifindex, 4191 ifp->prefix_len, 4192 ifp->scope, 4193 (u8) ifp->flags, 4194 ifp->idev->dev->name); 4195 return 0; 4196 } 4197 4198 static const struct seq_operations if6_seq_ops = { 4199 .start = if6_seq_start, 4200 .next = if6_seq_next, 4201 .show = if6_seq_show, 4202 .stop = if6_seq_stop, 4203 }; 4204 4205 static int if6_seq_open(struct inode *inode, struct file *file) 4206 { 4207 return seq_open_net(inode, file, &if6_seq_ops, 4208 sizeof(struct if6_iter_state)); 4209 } 4210 4211 static const struct file_operations if6_fops = { 4212 .owner = THIS_MODULE, 4213 .open = if6_seq_open, 4214 .read = seq_read, 4215 .llseek = seq_lseek, 4216 .release = seq_release_net, 4217 }; 4218 4219 static int __net_init if6_proc_net_init(struct net *net) 4220 { 4221 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4222 return -ENOMEM; 4223 return 0; 4224 } 4225 4226 static void __net_exit if6_proc_net_exit(struct net *net) 4227 { 4228 remove_proc_entry("if_inet6", net->proc_net); 4229 } 4230 4231 static struct pernet_operations if6_proc_net_ops = { 4232 .init = if6_proc_net_init, 4233 .exit = if6_proc_net_exit, 4234 }; 4235 4236 int __init if6_proc_init(void) 4237 { 4238 return register_pernet_subsys(&if6_proc_net_ops); 4239 } 4240 4241 void if6_proc_exit(void) 4242 { 4243 unregister_pernet_subsys(&if6_proc_net_ops); 4244 } 4245 #endif /* CONFIG_PROC_FS */ 4246 4247 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4248 /* Check if address is a home address configured on any interface. */ 4249 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4250 { 4251 int ret = 0; 4252 struct inet6_ifaddr *ifp = NULL; 4253 unsigned int hash = inet6_addr_hash(addr); 4254 4255 rcu_read_lock_bh(); 4256 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4257 if (!net_eq(dev_net(ifp->idev->dev), net)) 4258 continue; 4259 if (ipv6_addr_equal(&ifp->addr, addr) && 4260 (ifp->flags & IFA_F_HOMEADDRESS)) { 4261 ret = 1; 4262 break; 4263 } 4264 } 4265 rcu_read_unlock_bh(); 4266 return ret; 4267 } 4268 #endif 4269 4270 /* 4271 * Periodic address status verification 4272 */ 4273 4274 static void addrconf_verify_rtnl(void) 4275 { 4276 unsigned long now, next, next_sec, next_sched; 4277 struct inet6_ifaddr *ifp; 4278 int i; 4279 4280 ASSERT_RTNL(); 4281 4282 rcu_read_lock_bh(); 4283 now = jiffies; 4284 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4285 4286 cancel_delayed_work(&addr_chk_work); 4287 4288 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4289 restart: 4290 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4291 unsigned long age; 4292 4293 /* When setting preferred_lft to a value not zero or 4294 * infinity, while valid_lft is infinity 4295 * IFA_F_PERMANENT has a non-infinity life time. 4296 */ 4297 if ((ifp->flags & IFA_F_PERMANENT) && 4298 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4299 continue; 4300 4301 spin_lock(&ifp->lock); 4302 /* We try to batch several events at once. */ 4303 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4304 4305 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4306 age >= ifp->valid_lft) { 4307 spin_unlock(&ifp->lock); 4308 in6_ifa_hold(ifp); 4309 ipv6_del_addr(ifp); 4310 goto restart; 4311 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4312 spin_unlock(&ifp->lock); 4313 continue; 4314 } else if (age >= ifp->prefered_lft) { 4315 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4316 int deprecate = 0; 4317 4318 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4319 deprecate = 1; 4320 ifp->flags |= IFA_F_DEPRECATED; 4321 } 4322 4323 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4324 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4325 next = ifp->tstamp + ifp->valid_lft * HZ; 4326 4327 spin_unlock(&ifp->lock); 4328 4329 if (deprecate) { 4330 in6_ifa_hold(ifp); 4331 4332 ipv6_ifa_notify(0, ifp); 4333 in6_ifa_put(ifp); 4334 goto restart; 4335 } 4336 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4337 !(ifp->flags&IFA_F_TENTATIVE)) { 4338 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4339 ifp->idev->cnf.dad_transmits * 4340 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4341 4342 if (age >= ifp->prefered_lft - regen_advance) { 4343 struct inet6_ifaddr *ifpub = ifp->ifpub; 4344 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4345 next = ifp->tstamp + ifp->prefered_lft * HZ; 4346 if (!ifp->regen_count && ifpub) { 4347 ifp->regen_count++; 4348 in6_ifa_hold(ifp); 4349 in6_ifa_hold(ifpub); 4350 spin_unlock(&ifp->lock); 4351 4352 spin_lock(&ifpub->lock); 4353 ifpub->regen_count = 0; 4354 spin_unlock(&ifpub->lock); 4355 ipv6_create_tempaddr(ifpub, ifp); 4356 in6_ifa_put(ifpub); 4357 in6_ifa_put(ifp); 4358 goto restart; 4359 } 4360 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4361 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4362 spin_unlock(&ifp->lock); 4363 } else { 4364 /* ifp->prefered_lft <= ifp->valid_lft */ 4365 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4366 next = ifp->tstamp + ifp->prefered_lft * HZ; 4367 spin_unlock(&ifp->lock); 4368 } 4369 } 4370 } 4371 4372 next_sec = round_jiffies_up(next); 4373 next_sched = next; 4374 4375 /* If rounded timeout is accurate enough, accept it. */ 4376 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4377 next_sched = next_sec; 4378 4379 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4380 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4381 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4382 4383 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4384 now, next, next_sec, next_sched); 4385 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4386 rcu_read_unlock_bh(); 4387 } 4388 4389 static void addrconf_verify_work(struct work_struct *w) 4390 { 4391 rtnl_lock(); 4392 addrconf_verify_rtnl(); 4393 rtnl_unlock(); 4394 } 4395 4396 static void addrconf_verify(void) 4397 { 4398 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4399 } 4400 4401 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4402 struct in6_addr **peer_pfx) 4403 { 4404 struct in6_addr *pfx = NULL; 4405 4406 *peer_pfx = NULL; 4407 4408 if (addr) 4409 pfx = nla_data(addr); 4410 4411 if (local) { 4412 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4413 *peer_pfx = pfx; 4414 pfx = nla_data(local); 4415 } 4416 4417 return pfx; 4418 } 4419 4420 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4421 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4422 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4423 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4424 [IFA_FLAGS] = { .len = sizeof(u32) }, 4425 }; 4426 4427 static int 4428 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4429 struct netlink_ext_ack *extack) 4430 { 4431 struct net *net = sock_net(skb->sk); 4432 struct ifaddrmsg *ifm; 4433 struct nlattr *tb[IFA_MAX+1]; 4434 struct in6_addr *pfx, *peer_pfx; 4435 u32 ifa_flags; 4436 int err; 4437 4438 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4439 extack); 4440 if (err < 0) 4441 return err; 4442 4443 ifm = nlmsg_data(nlh); 4444 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4445 if (!pfx) 4446 return -EINVAL; 4447 4448 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4449 4450 /* We ignore other flags so far. */ 4451 ifa_flags &= IFA_F_MANAGETEMPADDR; 4452 4453 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4454 ifm->ifa_prefixlen); 4455 } 4456 4457 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4458 u32 prefered_lft, u32 valid_lft) 4459 { 4460 u32 flags; 4461 clock_t expires; 4462 unsigned long timeout; 4463 bool was_managetempaddr; 4464 bool had_prefixroute; 4465 4466 ASSERT_RTNL(); 4467 4468 if (!valid_lft || (prefered_lft > valid_lft)) 4469 return -EINVAL; 4470 4471 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4472 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4473 return -EINVAL; 4474 4475 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4476 if (addrconf_finite_timeout(timeout)) { 4477 expires = jiffies_to_clock_t(timeout * HZ); 4478 valid_lft = timeout; 4479 flags = RTF_EXPIRES; 4480 } else { 4481 expires = 0; 4482 flags = 0; 4483 ifa_flags |= IFA_F_PERMANENT; 4484 } 4485 4486 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4487 if (addrconf_finite_timeout(timeout)) { 4488 if (timeout == 0) 4489 ifa_flags |= IFA_F_DEPRECATED; 4490 prefered_lft = timeout; 4491 } 4492 4493 spin_lock_bh(&ifp->lock); 4494 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4495 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4496 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4497 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4498 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4499 IFA_F_NOPREFIXROUTE); 4500 ifp->flags |= ifa_flags; 4501 ifp->tstamp = jiffies; 4502 ifp->valid_lft = valid_lft; 4503 ifp->prefered_lft = prefered_lft; 4504 4505 spin_unlock_bh(&ifp->lock); 4506 if (!(ifp->flags&IFA_F_TENTATIVE)) 4507 ipv6_ifa_notify(0, ifp); 4508 4509 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4510 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4511 expires, flags); 4512 } else if (had_prefixroute) { 4513 enum cleanup_prefix_rt_t action; 4514 unsigned long rt_expires; 4515 4516 write_lock_bh(&ifp->idev->lock); 4517 action = check_cleanup_prefix_route(ifp, &rt_expires); 4518 write_unlock_bh(&ifp->idev->lock); 4519 4520 if (action != CLEANUP_PREFIX_RT_NOP) { 4521 cleanup_prefix_route(ifp, rt_expires, 4522 action == CLEANUP_PREFIX_RT_DEL); 4523 } 4524 } 4525 4526 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4527 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4528 valid_lft = prefered_lft = 0; 4529 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4530 !was_managetempaddr, jiffies); 4531 } 4532 4533 addrconf_verify_rtnl(); 4534 4535 return 0; 4536 } 4537 4538 static int 4539 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4540 struct netlink_ext_ack *extack) 4541 { 4542 struct net *net = sock_net(skb->sk); 4543 struct ifaddrmsg *ifm; 4544 struct nlattr *tb[IFA_MAX+1]; 4545 struct in6_addr *pfx, *peer_pfx; 4546 struct inet6_ifaddr *ifa; 4547 struct net_device *dev; 4548 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4549 u32 ifa_flags; 4550 int err; 4551 4552 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4553 extack); 4554 if (err < 0) 4555 return err; 4556 4557 ifm = nlmsg_data(nlh); 4558 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4559 if (!pfx) 4560 return -EINVAL; 4561 4562 if (tb[IFA_CACHEINFO]) { 4563 struct ifa_cacheinfo *ci; 4564 4565 ci = nla_data(tb[IFA_CACHEINFO]); 4566 valid_lft = ci->ifa_valid; 4567 preferred_lft = ci->ifa_prefered; 4568 } else { 4569 preferred_lft = INFINITY_LIFE_TIME; 4570 valid_lft = INFINITY_LIFE_TIME; 4571 } 4572 4573 dev = __dev_get_by_index(net, ifm->ifa_index); 4574 if (!dev) 4575 return -ENODEV; 4576 4577 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4578 4579 /* We ignore other flags so far. */ 4580 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4581 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4582 4583 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4584 if (!ifa) { 4585 /* 4586 * It would be best to check for !NLM_F_CREATE here but 4587 * userspace already relies on not having to provide this. 4588 */ 4589 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4590 ifm->ifa_prefixlen, ifa_flags, 4591 preferred_lft, valid_lft); 4592 } 4593 4594 if (nlh->nlmsg_flags & NLM_F_EXCL || 4595 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4596 err = -EEXIST; 4597 else 4598 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4599 4600 in6_ifa_put(ifa); 4601 4602 return err; 4603 } 4604 4605 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4606 u8 scope, int ifindex) 4607 { 4608 struct ifaddrmsg *ifm; 4609 4610 ifm = nlmsg_data(nlh); 4611 ifm->ifa_family = AF_INET6; 4612 ifm->ifa_prefixlen = prefixlen; 4613 ifm->ifa_flags = flags; 4614 ifm->ifa_scope = scope; 4615 ifm->ifa_index = ifindex; 4616 } 4617 4618 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4619 unsigned long tstamp, u32 preferred, u32 valid) 4620 { 4621 struct ifa_cacheinfo ci; 4622 4623 ci.cstamp = cstamp_delta(cstamp); 4624 ci.tstamp = cstamp_delta(tstamp); 4625 ci.ifa_prefered = preferred; 4626 ci.ifa_valid = valid; 4627 4628 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4629 } 4630 4631 static inline int rt_scope(int ifa_scope) 4632 { 4633 if (ifa_scope & IFA_HOST) 4634 return RT_SCOPE_HOST; 4635 else if (ifa_scope & IFA_LINK) 4636 return RT_SCOPE_LINK; 4637 else if (ifa_scope & IFA_SITE) 4638 return RT_SCOPE_SITE; 4639 else 4640 return RT_SCOPE_UNIVERSE; 4641 } 4642 4643 static inline int inet6_ifaddr_msgsize(void) 4644 { 4645 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4646 + nla_total_size(16) /* IFA_LOCAL */ 4647 + nla_total_size(16) /* IFA_ADDRESS */ 4648 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4649 + nla_total_size(4) /* IFA_FLAGS */; 4650 } 4651 4652 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4653 u32 portid, u32 seq, int event, unsigned int flags) 4654 { 4655 struct nlmsghdr *nlh; 4656 u32 preferred, valid; 4657 4658 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4659 if (!nlh) 4660 return -EMSGSIZE; 4661 4662 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4663 ifa->idev->dev->ifindex); 4664 4665 if (!((ifa->flags&IFA_F_PERMANENT) && 4666 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4667 preferred = ifa->prefered_lft; 4668 valid = ifa->valid_lft; 4669 if (preferred != INFINITY_LIFE_TIME) { 4670 long tval = (jiffies - ifa->tstamp)/HZ; 4671 if (preferred > tval) 4672 preferred -= tval; 4673 else 4674 preferred = 0; 4675 if (valid != INFINITY_LIFE_TIME) { 4676 if (valid > tval) 4677 valid -= tval; 4678 else 4679 valid = 0; 4680 } 4681 } 4682 } else { 4683 preferred = INFINITY_LIFE_TIME; 4684 valid = INFINITY_LIFE_TIME; 4685 } 4686 4687 if (!ipv6_addr_any(&ifa->peer_addr)) { 4688 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4689 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4690 goto error; 4691 } else 4692 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4693 goto error; 4694 4695 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4696 goto error; 4697 4698 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4699 goto error; 4700 4701 nlmsg_end(skb, nlh); 4702 return 0; 4703 4704 error: 4705 nlmsg_cancel(skb, nlh); 4706 return -EMSGSIZE; 4707 } 4708 4709 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4710 u32 portid, u32 seq, int event, u16 flags) 4711 { 4712 struct nlmsghdr *nlh; 4713 u8 scope = RT_SCOPE_UNIVERSE; 4714 int ifindex = ifmca->idev->dev->ifindex; 4715 4716 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4717 scope = RT_SCOPE_SITE; 4718 4719 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4720 if (!nlh) 4721 return -EMSGSIZE; 4722 4723 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4724 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4725 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4726 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4727 nlmsg_cancel(skb, nlh); 4728 return -EMSGSIZE; 4729 } 4730 4731 nlmsg_end(skb, nlh); 4732 return 0; 4733 } 4734 4735 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4736 u32 portid, u32 seq, int event, unsigned int flags) 4737 { 4738 struct nlmsghdr *nlh; 4739 u8 scope = RT_SCOPE_UNIVERSE; 4740 int ifindex = ifaca->aca_idev->dev->ifindex; 4741 4742 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4743 scope = RT_SCOPE_SITE; 4744 4745 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4746 if (!nlh) 4747 return -EMSGSIZE; 4748 4749 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4750 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4751 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4752 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4753 nlmsg_cancel(skb, nlh); 4754 return -EMSGSIZE; 4755 } 4756 4757 nlmsg_end(skb, nlh); 4758 return 0; 4759 } 4760 4761 enum addr_type_t { 4762 UNICAST_ADDR, 4763 MULTICAST_ADDR, 4764 ANYCAST_ADDR, 4765 }; 4766 4767 /* called with rcu_read_lock() */ 4768 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4769 struct netlink_callback *cb, enum addr_type_t type, 4770 int s_ip_idx, int *p_ip_idx) 4771 { 4772 struct ifmcaddr6 *ifmca; 4773 struct ifacaddr6 *ifaca; 4774 int err = 1; 4775 int ip_idx = *p_ip_idx; 4776 4777 read_lock_bh(&idev->lock); 4778 switch (type) { 4779 case UNICAST_ADDR: { 4780 struct inet6_ifaddr *ifa; 4781 4782 /* unicast address incl. temp addr */ 4783 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4784 if (++ip_idx < s_ip_idx) 4785 continue; 4786 err = inet6_fill_ifaddr(skb, ifa, 4787 NETLINK_CB(cb->skb).portid, 4788 cb->nlh->nlmsg_seq, 4789 RTM_NEWADDR, 4790 NLM_F_MULTI); 4791 if (err < 0) 4792 break; 4793 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4794 } 4795 break; 4796 } 4797 case MULTICAST_ADDR: 4798 /* multicast address */ 4799 for (ifmca = idev->mc_list; ifmca; 4800 ifmca = ifmca->next, ip_idx++) { 4801 if (ip_idx < s_ip_idx) 4802 continue; 4803 err = inet6_fill_ifmcaddr(skb, ifmca, 4804 NETLINK_CB(cb->skb).portid, 4805 cb->nlh->nlmsg_seq, 4806 RTM_GETMULTICAST, 4807 NLM_F_MULTI); 4808 if (err < 0) 4809 break; 4810 } 4811 break; 4812 case ANYCAST_ADDR: 4813 /* anycast address */ 4814 for (ifaca = idev->ac_list; ifaca; 4815 ifaca = ifaca->aca_next, ip_idx++) { 4816 if (ip_idx < s_ip_idx) 4817 continue; 4818 err = inet6_fill_ifacaddr(skb, ifaca, 4819 NETLINK_CB(cb->skb).portid, 4820 cb->nlh->nlmsg_seq, 4821 RTM_GETANYCAST, 4822 NLM_F_MULTI); 4823 if (err < 0) 4824 break; 4825 } 4826 break; 4827 default: 4828 break; 4829 } 4830 read_unlock_bh(&idev->lock); 4831 *p_ip_idx = ip_idx; 4832 return err; 4833 } 4834 4835 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4836 enum addr_type_t type) 4837 { 4838 struct net *net = sock_net(skb->sk); 4839 int h, s_h; 4840 int idx, ip_idx; 4841 int s_idx, s_ip_idx; 4842 struct net_device *dev; 4843 struct inet6_dev *idev; 4844 struct hlist_head *head; 4845 4846 s_h = cb->args[0]; 4847 s_idx = idx = cb->args[1]; 4848 s_ip_idx = ip_idx = cb->args[2]; 4849 4850 rcu_read_lock(); 4851 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4852 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4853 idx = 0; 4854 head = &net->dev_index_head[h]; 4855 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4856 if (idx < s_idx) 4857 goto cont; 4858 if (h > s_h || idx > s_idx) 4859 s_ip_idx = 0; 4860 ip_idx = 0; 4861 idev = __in6_dev_get(dev); 4862 if (!idev) 4863 goto cont; 4864 4865 if (in6_dump_addrs(idev, skb, cb, type, 4866 s_ip_idx, &ip_idx) < 0) 4867 goto done; 4868 cont: 4869 idx++; 4870 } 4871 } 4872 done: 4873 rcu_read_unlock(); 4874 cb->args[0] = h; 4875 cb->args[1] = idx; 4876 cb->args[2] = ip_idx; 4877 4878 return skb->len; 4879 } 4880 4881 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4882 { 4883 enum addr_type_t type = UNICAST_ADDR; 4884 4885 return inet6_dump_addr(skb, cb, type); 4886 } 4887 4888 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4889 { 4890 enum addr_type_t type = MULTICAST_ADDR; 4891 4892 return inet6_dump_addr(skb, cb, type); 4893 } 4894 4895 4896 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4897 { 4898 enum addr_type_t type = ANYCAST_ADDR; 4899 4900 return inet6_dump_addr(skb, cb, type); 4901 } 4902 4903 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4904 struct netlink_ext_ack *extack) 4905 { 4906 struct net *net = sock_net(in_skb->sk); 4907 struct ifaddrmsg *ifm; 4908 struct nlattr *tb[IFA_MAX+1]; 4909 struct in6_addr *addr = NULL, *peer; 4910 struct net_device *dev = NULL; 4911 struct inet6_ifaddr *ifa; 4912 struct sk_buff *skb; 4913 int err; 4914 4915 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4916 extack); 4917 if (err < 0) 4918 goto errout; 4919 4920 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4921 if (!addr) { 4922 err = -EINVAL; 4923 goto errout; 4924 } 4925 4926 ifm = nlmsg_data(nlh); 4927 if (ifm->ifa_index) 4928 dev = __dev_get_by_index(net, ifm->ifa_index); 4929 4930 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4931 if (!ifa) { 4932 err = -EADDRNOTAVAIL; 4933 goto errout; 4934 } 4935 4936 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4937 if (!skb) { 4938 err = -ENOBUFS; 4939 goto errout_ifa; 4940 } 4941 4942 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4943 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4944 if (err < 0) { 4945 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4946 WARN_ON(err == -EMSGSIZE); 4947 kfree_skb(skb); 4948 goto errout_ifa; 4949 } 4950 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4951 errout_ifa: 4952 in6_ifa_put(ifa); 4953 errout: 4954 return err; 4955 } 4956 4957 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4958 { 4959 struct sk_buff *skb; 4960 struct net *net = dev_net(ifa->idev->dev); 4961 int err = -ENOBUFS; 4962 4963 /* Don't send DELADDR notification for TENTATIVE address, 4964 * since NEWADDR notification is sent only after removing 4965 * TENTATIVE flag. 4966 */ 4967 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4968 return; 4969 4970 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4971 if (!skb) 4972 goto errout; 4973 4974 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4975 if (err < 0) { 4976 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4977 WARN_ON(err == -EMSGSIZE); 4978 kfree_skb(skb); 4979 goto errout; 4980 } 4981 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4982 return; 4983 errout: 4984 if (err < 0) 4985 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4986 } 4987 4988 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4989 __s32 *array, int bytes) 4990 { 4991 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4992 4993 memset(array, 0, bytes); 4994 array[DEVCONF_FORWARDING] = cnf->forwarding; 4995 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4996 array[DEVCONF_MTU6] = cnf->mtu6; 4997 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4998 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4999 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5000 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5001 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5002 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5003 jiffies_to_msecs(cnf->rtr_solicit_interval); 5004 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5005 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5006 array[DEVCONF_RTR_SOLICIT_DELAY] = 5007 jiffies_to_msecs(cnf->rtr_solicit_delay); 5008 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5009 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5010 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5011 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5012 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5013 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5014 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5015 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5016 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5017 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5018 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5019 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5020 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5021 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5022 #ifdef CONFIG_IPV6_ROUTER_PREF 5023 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5024 array[DEVCONF_RTR_PROBE_INTERVAL] = 5025 jiffies_to_msecs(cnf->rtr_probe_interval); 5026 #ifdef CONFIG_IPV6_ROUTE_INFO 5027 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5028 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5029 #endif 5030 #endif 5031 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5032 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5034 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5035 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5036 #endif 5037 #ifdef CONFIG_IPV6_MROUTE 5038 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5039 #endif 5040 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5041 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5042 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5043 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5044 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5045 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5046 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5047 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5048 /* we omit DEVCONF_STABLE_SECRET for now */ 5049 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5050 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5051 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5052 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5053 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5054 #ifdef CONFIG_IPV6_SEG6_HMAC 5055 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5056 #endif 5057 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5058 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5059 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5060 } 5061 5062 static inline size_t inet6_ifla6_size(void) 5063 { 5064 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5065 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5066 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5067 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5068 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5069 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5070 } 5071 5072 static inline size_t inet6_if_nlmsg_size(void) 5073 { 5074 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5075 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5076 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5077 + nla_total_size(4) /* IFLA_MTU */ 5078 + nla_total_size(4) /* IFLA_LINK */ 5079 + nla_total_size(1) /* IFLA_OPERSTATE */ 5080 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5081 } 5082 5083 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5084 int bytes) 5085 { 5086 int i; 5087 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5088 BUG_ON(pad < 0); 5089 5090 /* Use put_unaligned() because stats may not be aligned for u64. */ 5091 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5092 for (i = 1; i < ICMP6_MIB_MAX; i++) 5093 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5094 5095 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5096 } 5097 5098 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5099 int bytes, size_t syncpoff) 5100 { 5101 int i, c; 5102 u64 buff[IPSTATS_MIB_MAX]; 5103 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5104 5105 BUG_ON(pad < 0); 5106 5107 memset(buff, 0, sizeof(buff)); 5108 buff[0] = IPSTATS_MIB_MAX; 5109 5110 for_each_possible_cpu(c) { 5111 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5112 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5113 } 5114 5115 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5116 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5117 } 5118 5119 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5120 int bytes) 5121 { 5122 switch (attrtype) { 5123 case IFLA_INET6_STATS: 5124 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5125 offsetof(struct ipstats_mib, syncp)); 5126 break; 5127 case IFLA_INET6_ICMP6STATS: 5128 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5129 break; 5130 } 5131 } 5132 5133 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5134 u32 ext_filter_mask) 5135 { 5136 struct nlattr *nla; 5137 struct ifla_cacheinfo ci; 5138 5139 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5140 goto nla_put_failure; 5141 ci.max_reasm_len = IPV6_MAXPLEN; 5142 ci.tstamp = cstamp_delta(idev->tstamp); 5143 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5144 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5145 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5146 goto nla_put_failure; 5147 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5148 if (!nla) 5149 goto nla_put_failure; 5150 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5151 5152 /* XXX - MC not implemented */ 5153 5154 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5155 return 0; 5156 5157 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5158 if (!nla) 5159 goto nla_put_failure; 5160 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5161 5162 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5163 if (!nla) 5164 goto nla_put_failure; 5165 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5166 5167 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5168 if (!nla) 5169 goto nla_put_failure; 5170 5171 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5172 goto nla_put_failure; 5173 5174 read_lock_bh(&idev->lock); 5175 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5176 read_unlock_bh(&idev->lock); 5177 5178 return 0; 5179 5180 nla_put_failure: 5181 return -EMSGSIZE; 5182 } 5183 5184 static size_t inet6_get_link_af_size(const struct net_device *dev, 5185 u32 ext_filter_mask) 5186 { 5187 if (!__in6_dev_get(dev)) 5188 return 0; 5189 5190 return inet6_ifla6_size(); 5191 } 5192 5193 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5194 u32 ext_filter_mask) 5195 { 5196 struct inet6_dev *idev = __in6_dev_get(dev); 5197 5198 if (!idev) 5199 return -ENODATA; 5200 5201 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5202 return -EMSGSIZE; 5203 5204 return 0; 5205 } 5206 5207 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5208 { 5209 struct inet6_ifaddr *ifp; 5210 struct net_device *dev = idev->dev; 5211 bool clear_token, update_rs = false; 5212 struct in6_addr ll_addr; 5213 5214 ASSERT_RTNL(); 5215 5216 if (!token) 5217 return -EINVAL; 5218 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5219 return -EINVAL; 5220 if (!ipv6_accept_ra(idev)) 5221 return -EINVAL; 5222 if (idev->cnf.rtr_solicits == 0) 5223 return -EINVAL; 5224 5225 write_lock_bh(&idev->lock); 5226 5227 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5228 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5229 5230 write_unlock_bh(&idev->lock); 5231 5232 clear_token = ipv6_addr_any(token); 5233 if (clear_token) 5234 goto update_lft; 5235 5236 if (!idev->dead && (idev->if_flags & IF_READY) && 5237 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5238 IFA_F_OPTIMISTIC)) { 5239 /* If we're not ready, then normal ifup will take care 5240 * of this. Otherwise, we need to request our rs here. 5241 */ 5242 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5243 update_rs = true; 5244 } 5245 5246 update_lft: 5247 write_lock_bh(&idev->lock); 5248 5249 if (update_rs) { 5250 idev->if_flags |= IF_RS_SENT; 5251 idev->rs_interval = rfc3315_s14_backoff_init( 5252 idev->cnf.rtr_solicit_interval); 5253 idev->rs_probes = 1; 5254 addrconf_mod_rs_timer(idev, idev->rs_interval); 5255 } 5256 5257 /* Well, that's kinda nasty ... */ 5258 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5259 spin_lock(&ifp->lock); 5260 if (ifp->tokenized) { 5261 ifp->valid_lft = 0; 5262 ifp->prefered_lft = 0; 5263 } 5264 spin_unlock(&ifp->lock); 5265 } 5266 5267 write_unlock_bh(&idev->lock); 5268 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5269 addrconf_verify_rtnl(); 5270 return 0; 5271 } 5272 5273 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5274 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5275 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5276 }; 5277 5278 static int inet6_validate_link_af(const struct net_device *dev, 5279 const struct nlattr *nla) 5280 { 5281 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5282 5283 if (dev && !__in6_dev_get(dev)) 5284 return -EAFNOSUPPORT; 5285 5286 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5287 NULL); 5288 } 5289 5290 static int check_addr_gen_mode(int mode) 5291 { 5292 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5293 mode != IN6_ADDR_GEN_MODE_NONE && 5294 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5295 mode != IN6_ADDR_GEN_MODE_RANDOM) 5296 return -EINVAL; 5297 return 1; 5298 } 5299 5300 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5301 int mode) 5302 { 5303 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5304 !idev->cnf.stable_secret.initialized && 5305 !net->ipv6.devconf_dflt->stable_secret.initialized) 5306 return -EINVAL; 5307 return 1; 5308 } 5309 5310 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5311 { 5312 int err = -EINVAL; 5313 struct inet6_dev *idev = __in6_dev_get(dev); 5314 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5315 5316 if (!idev) 5317 return -EAFNOSUPPORT; 5318 5319 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5320 BUG(); 5321 5322 if (tb[IFLA_INET6_TOKEN]) { 5323 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5324 if (err) 5325 return err; 5326 } 5327 5328 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5329 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5330 5331 if (check_addr_gen_mode(mode) < 0 || 5332 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5333 return -EINVAL; 5334 5335 idev->cnf.addr_gen_mode = mode; 5336 err = 0; 5337 } 5338 5339 return err; 5340 } 5341 5342 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5343 u32 portid, u32 seq, int event, unsigned int flags) 5344 { 5345 struct net_device *dev = idev->dev; 5346 struct ifinfomsg *hdr; 5347 struct nlmsghdr *nlh; 5348 void *protoinfo; 5349 5350 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5351 if (!nlh) 5352 return -EMSGSIZE; 5353 5354 hdr = nlmsg_data(nlh); 5355 hdr->ifi_family = AF_INET6; 5356 hdr->__ifi_pad = 0; 5357 hdr->ifi_type = dev->type; 5358 hdr->ifi_index = dev->ifindex; 5359 hdr->ifi_flags = dev_get_flags(dev); 5360 hdr->ifi_change = 0; 5361 5362 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5363 (dev->addr_len && 5364 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5365 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5366 (dev->ifindex != dev_get_iflink(dev) && 5367 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5368 nla_put_u8(skb, IFLA_OPERSTATE, 5369 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5370 goto nla_put_failure; 5371 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5372 if (!protoinfo) 5373 goto nla_put_failure; 5374 5375 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5376 goto nla_put_failure; 5377 5378 nla_nest_end(skb, protoinfo); 5379 nlmsg_end(skb, nlh); 5380 return 0; 5381 5382 nla_put_failure: 5383 nlmsg_cancel(skb, nlh); 5384 return -EMSGSIZE; 5385 } 5386 5387 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5388 { 5389 struct net *net = sock_net(skb->sk); 5390 int h, s_h; 5391 int idx = 0, s_idx; 5392 struct net_device *dev; 5393 struct inet6_dev *idev; 5394 struct hlist_head *head; 5395 5396 s_h = cb->args[0]; 5397 s_idx = cb->args[1]; 5398 5399 rcu_read_lock(); 5400 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5401 idx = 0; 5402 head = &net->dev_index_head[h]; 5403 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5404 if (idx < s_idx) 5405 goto cont; 5406 idev = __in6_dev_get(dev); 5407 if (!idev) 5408 goto cont; 5409 if (inet6_fill_ifinfo(skb, idev, 5410 NETLINK_CB(cb->skb).portid, 5411 cb->nlh->nlmsg_seq, 5412 RTM_NEWLINK, NLM_F_MULTI) < 0) 5413 goto out; 5414 cont: 5415 idx++; 5416 } 5417 } 5418 out: 5419 rcu_read_unlock(); 5420 cb->args[1] = idx; 5421 cb->args[0] = h; 5422 5423 return skb->len; 5424 } 5425 5426 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5427 { 5428 struct sk_buff *skb; 5429 struct net *net = dev_net(idev->dev); 5430 int err = -ENOBUFS; 5431 5432 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5433 if (!skb) 5434 goto errout; 5435 5436 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5437 if (err < 0) { 5438 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5439 WARN_ON(err == -EMSGSIZE); 5440 kfree_skb(skb); 5441 goto errout; 5442 } 5443 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5444 return; 5445 errout: 5446 if (err < 0) 5447 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5448 } 5449 5450 static inline size_t inet6_prefix_nlmsg_size(void) 5451 { 5452 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5453 + nla_total_size(sizeof(struct in6_addr)) 5454 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5455 } 5456 5457 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5458 struct prefix_info *pinfo, u32 portid, u32 seq, 5459 int event, unsigned int flags) 5460 { 5461 struct prefixmsg *pmsg; 5462 struct nlmsghdr *nlh; 5463 struct prefix_cacheinfo ci; 5464 5465 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5466 if (!nlh) 5467 return -EMSGSIZE; 5468 5469 pmsg = nlmsg_data(nlh); 5470 pmsg->prefix_family = AF_INET6; 5471 pmsg->prefix_pad1 = 0; 5472 pmsg->prefix_pad2 = 0; 5473 pmsg->prefix_ifindex = idev->dev->ifindex; 5474 pmsg->prefix_len = pinfo->prefix_len; 5475 pmsg->prefix_type = pinfo->type; 5476 pmsg->prefix_pad3 = 0; 5477 pmsg->prefix_flags = 0; 5478 if (pinfo->onlink) 5479 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5480 if (pinfo->autoconf) 5481 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5482 5483 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5484 goto nla_put_failure; 5485 ci.preferred_time = ntohl(pinfo->prefered); 5486 ci.valid_time = ntohl(pinfo->valid); 5487 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5488 goto nla_put_failure; 5489 nlmsg_end(skb, nlh); 5490 return 0; 5491 5492 nla_put_failure: 5493 nlmsg_cancel(skb, nlh); 5494 return -EMSGSIZE; 5495 } 5496 5497 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5498 struct prefix_info *pinfo) 5499 { 5500 struct sk_buff *skb; 5501 struct net *net = dev_net(idev->dev); 5502 int err = -ENOBUFS; 5503 5504 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5505 if (!skb) 5506 goto errout; 5507 5508 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5509 if (err < 0) { 5510 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5511 WARN_ON(err == -EMSGSIZE); 5512 kfree_skb(skb); 5513 goto errout; 5514 } 5515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5516 return; 5517 errout: 5518 if (err < 0) 5519 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5520 } 5521 5522 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5523 { 5524 struct net *net = dev_net(ifp->idev->dev); 5525 5526 if (event) 5527 ASSERT_RTNL(); 5528 5529 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5530 5531 switch (event) { 5532 case RTM_NEWADDR: 5533 /* 5534 * If the address was optimistic 5535 * we inserted the route at the start of 5536 * our DAD process, so we don't need 5537 * to do it again 5538 */ 5539 if (!(ifp->rt->rt6i_node)) 5540 ip6_ins_rt(ifp->rt); 5541 if (ifp->idev->cnf.forwarding) 5542 addrconf_join_anycast(ifp); 5543 if (!ipv6_addr_any(&ifp->peer_addr)) 5544 addrconf_prefix_route(&ifp->peer_addr, 128, 5545 ifp->idev->dev, 0, 0); 5546 break; 5547 case RTM_DELADDR: 5548 if (ifp->idev->cnf.forwarding) 5549 addrconf_leave_anycast(ifp); 5550 addrconf_leave_solict(ifp->idev, &ifp->addr); 5551 if (!ipv6_addr_any(&ifp->peer_addr)) { 5552 struct rt6_info *rt; 5553 5554 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5555 ifp->idev->dev, 0, 0); 5556 if (rt) 5557 ip6_del_rt(rt); 5558 } 5559 if (ifp->rt) { 5560 dst_hold(&ifp->rt->dst); 5561 ip6_del_rt(ifp->rt); 5562 } 5563 rt_genid_bump_ipv6(net); 5564 break; 5565 } 5566 atomic_inc(&net->ipv6.dev_addr_genid); 5567 } 5568 5569 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5570 { 5571 rcu_read_lock_bh(); 5572 if (likely(ifp->idev->dead == 0)) 5573 __ipv6_ifa_notify(event, ifp); 5574 rcu_read_unlock_bh(); 5575 } 5576 5577 #ifdef CONFIG_SYSCTL 5578 5579 static 5580 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5581 void __user *buffer, size_t *lenp, loff_t *ppos) 5582 { 5583 int *valp = ctl->data; 5584 int val = *valp; 5585 loff_t pos = *ppos; 5586 struct ctl_table lctl; 5587 int ret; 5588 5589 /* 5590 * ctl->data points to idev->cnf.forwarding, we should 5591 * not modify it until we get the rtnl lock. 5592 */ 5593 lctl = *ctl; 5594 lctl.data = &val; 5595 5596 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5597 5598 if (write) 5599 ret = addrconf_fixup_forwarding(ctl, valp, val); 5600 if (ret) 5601 *ppos = pos; 5602 return ret; 5603 } 5604 5605 static 5606 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5607 void __user *buffer, size_t *lenp, loff_t *ppos) 5608 { 5609 struct inet6_dev *idev = ctl->extra1; 5610 int min_mtu = IPV6_MIN_MTU; 5611 struct ctl_table lctl; 5612 5613 lctl = *ctl; 5614 lctl.extra1 = &min_mtu; 5615 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5616 5617 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5618 } 5619 5620 static void dev_disable_change(struct inet6_dev *idev) 5621 { 5622 struct netdev_notifier_info info; 5623 5624 if (!idev || !idev->dev) 5625 return; 5626 5627 netdev_notifier_info_init(&info, idev->dev); 5628 if (idev->cnf.disable_ipv6) 5629 addrconf_notify(NULL, NETDEV_DOWN, &info); 5630 else 5631 addrconf_notify(NULL, NETDEV_UP, &info); 5632 } 5633 5634 static void addrconf_disable_change(struct net *net, __s32 newf) 5635 { 5636 struct net_device *dev; 5637 struct inet6_dev *idev; 5638 5639 for_each_netdev(net, dev) { 5640 idev = __in6_dev_get(dev); 5641 if (idev) { 5642 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5643 idev->cnf.disable_ipv6 = newf; 5644 if (changed) 5645 dev_disable_change(idev); 5646 } 5647 } 5648 } 5649 5650 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5651 { 5652 struct net *net; 5653 int old; 5654 5655 if (!rtnl_trylock()) 5656 return restart_syscall(); 5657 5658 net = (struct net *)table->extra2; 5659 old = *p; 5660 *p = newf; 5661 5662 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5663 rtnl_unlock(); 5664 return 0; 5665 } 5666 5667 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5668 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5669 addrconf_disable_change(net, newf); 5670 } else if ((!newf) ^ (!old)) 5671 dev_disable_change((struct inet6_dev *)table->extra1); 5672 5673 rtnl_unlock(); 5674 return 0; 5675 } 5676 5677 static 5678 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5679 void __user *buffer, size_t *lenp, loff_t *ppos) 5680 { 5681 int *valp = ctl->data; 5682 int val = *valp; 5683 loff_t pos = *ppos; 5684 struct ctl_table lctl; 5685 int ret; 5686 5687 /* 5688 * ctl->data points to idev->cnf.disable_ipv6, we should 5689 * not modify it until we get the rtnl lock. 5690 */ 5691 lctl = *ctl; 5692 lctl.data = &val; 5693 5694 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5695 5696 if (write) 5697 ret = addrconf_disable_ipv6(ctl, valp, val); 5698 if (ret) 5699 *ppos = pos; 5700 return ret; 5701 } 5702 5703 static 5704 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5705 void __user *buffer, size_t *lenp, loff_t *ppos) 5706 { 5707 int *valp = ctl->data; 5708 int ret; 5709 int old, new; 5710 5711 old = *valp; 5712 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5713 new = *valp; 5714 5715 if (write && old != new) { 5716 struct net *net = ctl->extra2; 5717 5718 if (!rtnl_trylock()) 5719 return restart_syscall(); 5720 5721 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5722 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5723 NETCONFA_PROXY_NEIGH, 5724 NETCONFA_IFINDEX_DEFAULT, 5725 net->ipv6.devconf_dflt); 5726 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5727 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5728 NETCONFA_PROXY_NEIGH, 5729 NETCONFA_IFINDEX_ALL, 5730 net->ipv6.devconf_all); 5731 else { 5732 struct inet6_dev *idev = ctl->extra1; 5733 5734 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5735 NETCONFA_PROXY_NEIGH, 5736 idev->dev->ifindex, 5737 &idev->cnf); 5738 } 5739 rtnl_unlock(); 5740 } 5741 5742 return ret; 5743 } 5744 5745 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5746 void __user *buffer, size_t *lenp, 5747 loff_t *ppos) 5748 { 5749 int ret = 0; 5750 int new_val; 5751 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5752 struct net *net = (struct net *)ctl->extra2; 5753 5754 if (!rtnl_trylock()) 5755 return restart_syscall(); 5756 5757 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5758 5759 if (write) { 5760 new_val = *((int *)ctl->data); 5761 5762 if (check_addr_gen_mode(new_val) < 0) { 5763 ret = -EINVAL; 5764 goto out; 5765 } 5766 5767 /* request for default */ 5768 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5769 ipv6_devconf_dflt.addr_gen_mode = new_val; 5770 5771 /* request for individual net device */ 5772 } else { 5773 if (!idev) 5774 goto out; 5775 5776 if (check_stable_privacy(idev, net, new_val) < 0) { 5777 ret = -EINVAL; 5778 goto out; 5779 } 5780 5781 if (idev->cnf.addr_gen_mode != new_val) { 5782 idev->cnf.addr_gen_mode = new_val; 5783 addrconf_dev_config(idev->dev); 5784 } 5785 } 5786 } 5787 5788 out: 5789 rtnl_unlock(); 5790 5791 return ret; 5792 } 5793 5794 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5795 void __user *buffer, size_t *lenp, 5796 loff_t *ppos) 5797 { 5798 int err; 5799 struct in6_addr addr; 5800 char str[IPV6_MAX_STRLEN]; 5801 struct ctl_table lctl = *ctl; 5802 struct net *net = ctl->extra2; 5803 struct ipv6_stable_secret *secret = ctl->data; 5804 5805 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5806 return -EIO; 5807 5808 lctl.maxlen = IPV6_MAX_STRLEN; 5809 lctl.data = str; 5810 5811 if (!rtnl_trylock()) 5812 return restart_syscall(); 5813 5814 if (!write && !secret->initialized) { 5815 err = -EIO; 5816 goto out; 5817 } 5818 5819 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5820 if (err >= sizeof(str)) { 5821 err = -EIO; 5822 goto out; 5823 } 5824 5825 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5826 if (err || !write) 5827 goto out; 5828 5829 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5830 err = -EIO; 5831 goto out; 5832 } 5833 5834 secret->initialized = true; 5835 secret->secret = addr; 5836 5837 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5838 struct net_device *dev; 5839 5840 for_each_netdev(net, dev) { 5841 struct inet6_dev *idev = __in6_dev_get(dev); 5842 5843 if (idev) { 5844 idev->cnf.addr_gen_mode = 5845 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5846 } 5847 } 5848 } else { 5849 struct inet6_dev *idev = ctl->extra1; 5850 5851 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5852 } 5853 5854 out: 5855 rtnl_unlock(); 5856 5857 return err; 5858 } 5859 5860 static 5861 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5862 int write, 5863 void __user *buffer, 5864 size_t *lenp, 5865 loff_t *ppos) 5866 { 5867 int *valp = ctl->data; 5868 int val = *valp; 5869 loff_t pos = *ppos; 5870 struct ctl_table lctl; 5871 int ret; 5872 5873 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5874 * we should not modify it until we get the rtnl lock. 5875 */ 5876 lctl = *ctl; 5877 lctl.data = &val; 5878 5879 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5880 5881 if (write) 5882 ret = addrconf_fixup_linkdown(ctl, valp, val); 5883 if (ret) 5884 *ppos = pos; 5885 return ret; 5886 } 5887 5888 static 5889 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5890 { 5891 if (rt) { 5892 if (action) 5893 rt->dst.flags |= DST_NOPOLICY; 5894 else 5895 rt->dst.flags &= ~DST_NOPOLICY; 5896 } 5897 } 5898 5899 static 5900 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5901 { 5902 struct inet6_ifaddr *ifa; 5903 5904 read_lock_bh(&idev->lock); 5905 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5906 spin_lock(&ifa->lock); 5907 if (ifa->rt) { 5908 struct rt6_info *rt = ifa->rt; 5909 struct fib6_table *table = rt->rt6i_table; 5910 int cpu; 5911 5912 read_lock(&table->tb6_lock); 5913 addrconf_set_nopolicy(ifa->rt, val); 5914 if (rt->rt6i_pcpu) { 5915 for_each_possible_cpu(cpu) { 5916 struct rt6_info **rtp; 5917 5918 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5919 addrconf_set_nopolicy(*rtp, val); 5920 } 5921 } 5922 read_unlock(&table->tb6_lock); 5923 } 5924 spin_unlock(&ifa->lock); 5925 } 5926 read_unlock_bh(&idev->lock); 5927 } 5928 5929 static 5930 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5931 { 5932 struct inet6_dev *idev; 5933 struct net *net; 5934 5935 if (!rtnl_trylock()) 5936 return restart_syscall(); 5937 5938 *valp = val; 5939 5940 net = (struct net *)ctl->extra2; 5941 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5942 rtnl_unlock(); 5943 return 0; 5944 } 5945 5946 if (valp == &net->ipv6.devconf_all->disable_policy) { 5947 struct net_device *dev; 5948 5949 for_each_netdev(net, dev) { 5950 idev = __in6_dev_get(dev); 5951 if (idev) 5952 addrconf_disable_policy_idev(idev, val); 5953 } 5954 } else { 5955 idev = (struct inet6_dev *)ctl->extra1; 5956 addrconf_disable_policy_idev(idev, val); 5957 } 5958 5959 rtnl_unlock(); 5960 return 0; 5961 } 5962 5963 static 5964 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5965 void __user *buffer, size_t *lenp, 5966 loff_t *ppos) 5967 { 5968 int *valp = ctl->data; 5969 int val = *valp; 5970 loff_t pos = *ppos; 5971 struct ctl_table lctl; 5972 int ret; 5973 5974 lctl = *ctl; 5975 lctl.data = &val; 5976 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5977 5978 if (write && (*valp != val)) 5979 ret = addrconf_disable_policy(ctl, valp, val); 5980 5981 if (ret) 5982 *ppos = pos; 5983 5984 return ret; 5985 } 5986 5987 static int minus_one = -1; 5988 static const int one = 1; 5989 static const int two_five_five = 255; 5990 5991 static const struct ctl_table addrconf_sysctl[] = { 5992 { 5993 .procname = "forwarding", 5994 .data = &ipv6_devconf.forwarding, 5995 .maxlen = sizeof(int), 5996 .mode = 0644, 5997 .proc_handler = addrconf_sysctl_forward, 5998 }, 5999 { 6000 .procname = "hop_limit", 6001 .data = &ipv6_devconf.hop_limit, 6002 .maxlen = sizeof(int), 6003 .mode = 0644, 6004 .proc_handler = proc_dointvec_minmax, 6005 .extra1 = (void *)&one, 6006 .extra2 = (void *)&two_five_five, 6007 }, 6008 { 6009 .procname = "mtu", 6010 .data = &ipv6_devconf.mtu6, 6011 .maxlen = sizeof(int), 6012 .mode = 0644, 6013 .proc_handler = addrconf_sysctl_mtu, 6014 }, 6015 { 6016 .procname = "accept_ra", 6017 .data = &ipv6_devconf.accept_ra, 6018 .maxlen = sizeof(int), 6019 .mode = 0644, 6020 .proc_handler = proc_dointvec, 6021 }, 6022 { 6023 .procname = "accept_redirects", 6024 .data = &ipv6_devconf.accept_redirects, 6025 .maxlen = sizeof(int), 6026 .mode = 0644, 6027 .proc_handler = proc_dointvec, 6028 }, 6029 { 6030 .procname = "autoconf", 6031 .data = &ipv6_devconf.autoconf, 6032 .maxlen = sizeof(int), 6033 .mode = 0644, 6034 .proc_handler = proc_dointvec, 6035 }, 6036 { 6037 .procname = "dad_transmits", 6038 .data = &ipv6_devconf.dad_transmits, 6039 .maxlen = sizeof(int), 6040 .mode = 0644, 6041 .proc_handler = proc_dointvec, 6042 }, 6043 { 6044 .procname = "router_solicitations", 6045 .data = &ipv6_devconf.rtr_solicits, 6046 .maxlen = sizeof(int), 6047 .mode = 0644, 6048 .proc_handler = proc_dointvec_minmax, 6049 .extra1 = &minus_one, 6050 }, 6051 { 6052 .procname = "router_solicitation_interval", 6053 .data = &ipv6_devconf.rtr_solicit_interval, 6054 .maxlen = sizeof(int), 6055 .mode = 0644, 6056 .proc_handler = proc_dointvec_jiffies, 6057 }, 6058 { 6059 .procname = "router_solicitation_max_interval", 6060 .data = &ipv6_devconf.rtr_solicit_max_interval, 6061 .maxlen = sizeof(int), 6062 .mode = 0644, 6063 .proc_handler = proc_dointvec_jiffies, 6064 }, 6065 { 6066 .procname = "router_solicitation_delay", 6067 .data = &ipv6_devconf.rtr_solicit_delay, 6068 .maxlen = sizeof(int), 6069 .mode = 0644, 6070 .proc_handler = proc_dointvec_jiffies, 6071 }, 6072 { 6073 .procname = "force_mld_version", 6074 .data = &ipv6_devconf.force_mld_version, 6075 .maxlen = sizeof(int), 6076 .mode = 0644, 6077 .proc_handler = proc_dointvec, 6078 }, 6079 { 6080 .procname = "mldv1_unsolicited_report_interval", 6081 .data = 6082 &ipv6_devconf.mldv1_unsolicited_report_interval, 6083 .maxlen = sizeof(int), 6084 .mode = 0644, 6085 .proc_handler = proc_dointvec_ms_jiffies, 6086 }, 6087 { 6088 .procname = "mldv2_unsolicited_report_interval", 6089 .data = 6090 &ipv6_devconf.mldv2_unsolicited_report_interval, 6091 .maxlen = sizeof(int), 6092 .mode = 0644, 6093 .proc_handler = proc_dointvec_ms_jiffies, 6094 }, 6095 { 6096 .procname = "use_tempaddr", 6097 .data = &ipv6_devconf.use_tempaddr, 6098 .maxlen = sizeof(int), 6099 .mode = 0644, 6100 .proc_handler = proc_dointvec, 6101 }, 6102 { 6103 .procname = "temp_valid_lft", 6104 .data = &ipv6_devconf.temp_valid_lft, 6105 .maxlen = sizeof(int), 6106 .mode = 0644, 6107 .proc_handler = proc_dointvec, 6108 }, 6109 { 6110 .procname = "temp_prefered_lft", 6111 .data = &ipv6_devconf.temp_prefered_lft, 6112 .maxlen = sizeof(int), 6113 .mode = 0644, 6114 .proc_handler = proc_dointvec, 6115 }, 6116 { 6117 .procname = "regen_max_retry", 6118 .data = &ipv6_devconf.regen_max_retry, 6119 .maxlen = sizeof(int), 6120 .mode = 0644, 6121 .proc_handler = proc_dointvec, 6122 }, 6123 { 6124 .procname = "max_desync_factor", 6125 .data = &ipv6_devconf.max_desync_factor, 6126 .maxlen = sizeof(int), 6127 .mode = 0644, 6128 .proc_handler = proc_dointvec, 6129 }, 6130 { 6131 .procname = "max_addresses", 6132 .data = &ipv6_devconf.max_addresses, 6133 .maxlen = sizeof(int), 6134 .mode = 0644, 6135 .proc_handler = proc_dointvec, 6136 }, 6137 { 6138 .procname = "accept_ra_defrtr", 6139 .data = &ipv6_devconf.accept_ra_defrtr, 6140 .maxlen = sizeof(int), 6141 .mode = 0644, 6142 .proc_handler = proc_dointvec, 6143 }, 6144 { 6145 .procname = "accept_ra_min_hop_limit", 6146 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6147 .maxlen = sizeof(int), 6148 .mode = 0644, 6149 .proc_handler = proc_dointvec, 6150 }, 6151 { 6152 .procname = "accept_ra_pinfo", 6153 .data = &ipv6_devconf.accept_ra_pinfo, 6154 .maxlen = sizeof(int), 6155 .mode = 0644, 6156 .proc_handler = proc_dointvec, 6157 }, 6158 #ifdef CONFIG_IPV6_ROUTER_PREF 6159 { 6160 .procname = "accept_ra_rtr_pref", 6161 .data = &ipv6_devconf.accept_ra_rtr_pref, 6162 .maxlen = sizeof(int), 6163 .mode = 0644, 6164 .proc_handler = proc_dointvec, 6165 }, 6166 { 6167 .procname = "router_probe_interval", 6168 .data = &ipv6_devconf.rtr_probe_interval, 6169 .maxlen = sizeof(int), 6170 .mode = 0644, 6171 .proc_handler = proc_dointvec_jiffies, 6172 }, 6173 #ifdef CONFIG_IPV6_ROUTE_INFO 6174 { 6175 .procname = "accept_ra_rt_info_min_plen", 6176 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6177 .maxlen = sizeof(int), 6178 .mode = 0644, 6179 .proc_handler = proc_dointvec, 6180 }, 6181 { 6182 .procname = "accept_ra_rt_info_max_plen", 6183 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6184 .maxlen = sizeof(int), 6185 .mode = 0644, 6186 .proc_handler = proc_dointvec, 6187 }, 6188 #endif 6189 #endif 6190 { 6191 .procname = "proxy_ndp", 6192 .data = &ipv6_devconf.proxy_ndp, 6193 .maxlen = sizeof(int), 6194 .mode = 0644, 6195 .proc_handler = addrconf_sysctl_proxy_ndp, 6196 }, 6197 { 6198 .procname = "accept_source_route", 6199 .data = &ipv6_devconf.accept_source_route, 6200 .maxlen = sizeof(int), 6201 .mode = 0644, 6202 .proc_handler = proc_dointvec, 6203 }, 6204 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6205 { 6206 .procname = "optimistic_dad", 6207 .data = &ipv6_devconf.optimistic_dad, 6208 .maxlen = sizeof(int), 6209 .mode = 0644, 6210 .proc_handler = proc_dointvec, 6211 }, 6212 { 6213 .procname = "use_optimistic", 6214 .data = &ipv6_devconf.use_optimistic, 6215 .maxlen = sizeof(int), 6216 .mode = 0644, 6217 .proc_handler = proc_dointvec, 6218 }, 6219 #endif 6220 #ifdef CONFIG_IPV6_MROUTE 6221 { 6222 .procname = "mc_forwarding", 6223 .data = &ipv6_devconf.mc_forwarding, 6224 .maxlen = sizeof(int), 6225 .mode = 0444, 6226 .proc_handler = proc_dointvec, 6227 }, 6228 #endif 6229 { 6230 .procname = "disable_ipv6", 6231 .data = &ipv6_devconf.disable_ipv6, 6232 .maxlen = sizeof(int), 6233 .mode = 0644, 6234 .proc_handler = addrconf_sysctl_disable, 6235 }, 6236 { 6237 .procname = "accept_dad", 6238 .data = &ipv6_devconf.accept_dad, 6239 .maxlen = sizeof(int), 6240 .mode = 0644, 6241 .proc_handler = proc_dointvec, 6242 }, 6243 { 6244 .procname = "force_tllao", 6245 .data = &ipv6_devconf.force_tllao, 6246 .maxlen = sizeof(int), 6247 .mode = 0644, 6248 .proc_handler = proc_dointvec 6249 }, 6250 { 6251 .procname = "ndisc_notify", 6252 .data = &ipv6_devconf.ndisc_notify, 6253 .maxlen = sizeof(int), 6254 .mode = 0644, 6255 .proc_handler = proc_dointvec 6256 }, 6257 { 6258 .procname = "suppress_frag_ndisc", 6259 .data = &ipv6_devconf.suppress_frag_ndisc, 6260 .maxlen = sizeof(int), 6261 .mode = 0644, 6262 .proc_handler = proc_dointvec 6263 }, 6264 { 6265 .procname = "accept_ra_from_local", 6266 .data = &ipv6_devconf.accept_ra_from_local, 6267 .maxlen = sizeof(int), 6268 .mode = 0644, 6269 .proc_handler = proc_dointvec, 6270 }, 6271 { 6272 .procname = "accept_ra_mtu", 6273 .data = &ipv6_devconf.accept_ra_mtu, 6274 .maxlen = sizeof(int), 6275 .mode = 0644, 6276 .proc_handler = proc_dointvec, 6277 }, 6278 { 6279 .procname = "stable_secret", 6280 .data = &ipv6_devconf.stable_secret, 6281 .maxlen = IPV6_MAX_STRLEN, 6282 .mode = 0600, 6283 .proc_handler = addrconf_sysctl_stable_secret, 6284 }, 6285 { 6286 .procname = "use_oif_addrs_only", 6287 .data = &ipv6_devconf.use_oif_addrs_only, 6288 .maxlen = sizeof(int), 6289 .mode = 0644, 6290 .proc_handler = proc_dointvec, 6291 }, 6292 { 6293 .procname = "ignore_routes_with_linkdown", 6294 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6295 .maxlen = sizeof(int), 6296 .mode = 0644, 6297 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6298 }, 6299 { 6300 .procname = "drop_unicast_in_l2_multicast", 6301 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6302 .maxlen = sizeof(int), 6303 .mode = 0644, 6304 .proc_handler = proc_dointvec, 6305 }, 6306 { 6307 .procname = "drop_unsolicited_na", 6308 .data = &ipv6_devconf.drop_unsolicited_na, 6309 .maxlen = sizeof(int), 6310 .mode = 0644, 6311 .proc_handler = proc_dointvec, 6312 }, 6313 { 6314 .procname = "keep_addr_on_down", 6315 .data = &ipv6_devconf.keep_addr_on_down, 6316 .maxlen = sizeof(int), 6317 .mode = 0644, 6318 .proc_handler = proc_dointvec, 6319 6320 }, 6321 { 6322 .procname = "seg6_enabled", 6323 .data = &ipv6_devconf.seg6_enabled, 6324 .maxlen = sizeof(int), 6325 .mode = 0644, 6326 .proc_handler = proc_dointvec, 6327 }, 6328 #ifdef CONFIG_IPV6_SEG6_HMAC 6329 { 6330 .procname = "seg6_require_hmac", 6331 .data = &ipv6_devconf.seg6_require_hmac, 6332 .maxlen = sizeof(int), 6333 .mode = 0644, 6334 .proc_handler = proc_dointvec, 6335 }, 6336 #endif 6337 { 6338 .procname = "enhanced_dad", 6339 .data = &ipv6_devconf.enhanced_dad, 6340 .maxlen = sizeof(int), 6341 .mode = 0644, 6342 .proc_handler = proc_dointvec, 6343 }, 6344 { 6345 .procname = "addr_gen_mode", 6346 .data = &ipv6_devconf.addr_gen_mode, 6347 .maxlen = sizeof(int), 6348 .mode = 0644, 6349 .proc_handler = addrconf_sysctl_addr_gen_mode, 6350 }, 6351 { 6352 .procname = "disable_policy", 6353 .data = &ipv6_devconf.disable_policy, 6354 .maxlen = sizeof(int), 6355 .mode = 0644, 6356 .proc_handler = addrconf_sysctl_disable_policy, 6357 }, 6358 { 6359 /* sentinel */ 6360 } 6361 }; 6362 6363 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6364 struct inet6_dev *idev, struct ipv6_devconf *p) 6365 { 6366 int i, ifindex; 6367 struct ctl_table *table; 6368 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6369 6370 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6371 if (!table) 6372 goto out; 6373 6374 for (i = 0; table[i].data; i++) { 6375 table[i].data += (char *)p - (char *)&ipv6_devconf; 6376 /* If one of these is already set, then it is not safe to 6377 * overwrite either of them: this makes proc_dointvec_minmax 6378 * usable. 6379 */ 6380 if (!table[i].extra1 && !table[i].extra2) { 6381 table[i].extra1 = idev; /* embedded; no ref */ 6382 table[i].extra2 = net; 6383 } 6384 } 6385 6386 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6387 6388 p->sysctl_header = register_net_sysctl(net, path, table); 6389 if (!p->sysctl_header) 6390 goto free; 6391 6392 if (!strcmp(dev_name, "all")) 6393 ifindex = NETCONFA_IFINDEX_ALL; 6394 else if (!strcmp(dev_name, "default")) 6395 ifindex = NETCONFA_IFINDEX_DEFAULT; 6396 else 6397 ifindex = idev->dev->ifindex; 6398 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6399 ifindex, p); 6400 return 0; 6401 6402 free: 6403 kfree(table); 6404 out: 6405 return -ENOBUFS; 6406 } 6407 6408 static void __addrconf_sysctl_unregister(struct net *net, 6409 struct ipv6_devconf *p, int ifindex) 6410 { 6411 struct ctl_table *table; 6412 6413 if (!p->sysctl_header) 6414 return; 6415 6416 table = p->sysctl_header->ctl_table_arg; 6417 unregister_net_sysctl_table(p->sysctl_header); 6418 p->sysctl_header = NULL; 6419 kfree(table); 6420 6421 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6422 } 6423 6424 static int addrconf_sysctl_register(struct inet6_dev *idev) 6425 { 6426 int err; 6427 6428 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6429 return -EINVAL; 6430 6431 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6432 &ndisc_ifinfo_sysctl_change); 6433 if (err) 6434 return err; 6435 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6436 idev, &idev->cnf); 6437 if (err) 6438 neigh_sysctl_unregister(idev->nd_parms); 6439 6440 return err; 6441 } 6442 6443 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6444 { 6445 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6446 idev->dev->ifindex); 6447 neigh_sysctl_unregister(idev->nd_parms); 6448 } 6449 6450 6451 #endif 6452 6453 static int __net_init addrconf_init_net(struct net *net) 6454 { 6455 int err = -ENOMEM; 6456 struct ipv6_devconf *all, *dflt; 6457 6458 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6459 if (!all) 6460 goto err_alloc_all; 6461 6462 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6463 if (!dflt) 6464 goto err_alloc_dflt; 6465 6466 /* these will be inherited by all namespaces */ 6467 dflt->autoconf = ipv6_defaults.autoconf; 6468 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6469 6470 dflt->stable_secret.initialized = false; 6471 all->stable_secret.initialized = false; 6472 6473 net->ipv6.devconf_all = all; 6474 net->ipv6.devconf_dflt = dflt; 6475 6476 #ifdef CONFIG_SYSCTL 6477 err = __addrconf_sysctl_register(net, "all", NULL, all); 6478 if (err < 0) 6479 goto err_reg_all; 6480 6481 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6482 if (err < 0) 6483 goto err_reg_dflt; 6484 #endif 6485 return 0; 6486 6487 #ifdef CONFIG_SYSCTL 6488 err_reg_dflt: 6489 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6490 err_reg_all: 6491 kfree(dflt); 6492 #endif 6493 err_alloc_dflt: 6494 kfree(all); 6495 err_alloc_all: 6496 return err; 6497 } 6498 6499 static void __net_exit addrconf_exit_net(struct net *net) 6500 { 6501 #ifdef CONFIG_SYSCTL 6502 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6503 NETCONFA_IFINDEX_DEFAULT); 6504 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6505 NETCONFA_IFINDEX_ALL); 6506 #endif 6507 kfree(net->ipv6.devconf_dflt); 6508 kfree(net->ipv6.devconf_all); 6509 } 6510 6511 static struct pernet_operations addrconf_ops = { 6512 .init = addrconf_init_net, 6513 .exit = addrconf_exit_net, 6514 }; 6515 6516 static struct rtnl_af_ops inet6_ops __read_mostly = { 6517 .family = AF_INET6, 6518 .fill_link_af = inet6_fill_link_af, 6519 .get_link_af_size = inet6_get_link_af_size, 6520 .validate_link_af = inet6_validate_link_af, 6521 .set_link_af = inet6_set_link_af, 6522 }; 6523 6524 /* 6525 * Init / cleanup code 6526 */ 6527 6528 int __init addrconf_init(void) 6529 { 6530 struct inet6_dev *idev; 6531 int i, err; 6532 6533 err = ipv6_addr_label_init(); 6534 if (err < 0) { 6535 pr_crit("%s: cannot initialize default policy table: %d\n", 6536 __func__, err); 6537 goto out; 6538 } 6539 6540 err = register_pernet_subsys(&addrconf_ops); 6541 if (err < 0) 6542 goto out_addrlabel; 6543 6544 addrconf_wq = create_workqueue("ipv6_addrconf"); 6545 if (!addrconf_wq) { 6546 err = -ENOMEM; 6547 goto out_nowq; 6548 } 6549 6550 /* The addrconf netdev notifier requires that loopback_dev 6551 * has it's ipv6 private information allocated and setup 6552 * before it can bring up and give link-local addresses 6553 * to other devices which are up. 6554 * 6555 * Unfortunately, loopback_dev is not necessarily the first 6556 * entry in the global dev_base list of net devices. In fact, 6557 * it is likely to be the very last entry on that list. 6558 * So this causes the notifier registry below to try and 6559 * give link-local addresses to all devices besides loopback_dev 6560 * first, then loopback_dev, which cases all the non-loopback_dev 6561 * devices to fail to get a link-local address. 6562 * 6563 * So, as a temporary fix, allocate the ipv6 structure for 6564 * loopback_dev first by hand. 6565 * Longer term, all of the dependencies ipv6 has upon the loopback 6566 * device and it being up should be removed. 6567 */ 6568 rtnl_lock(); 6569 idev = ipv6_add_dev(init_net.loopback_dev); 6570 rtnl_unlock(); 6571 if (IS_ERR(idev)) { 6572 err = PTR_ERR(idev); 6573 goto errlo; 6574 } 6575 6576 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6577 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6578 6579 register_netdevice_notifier(&ipv6_dev_notf); 6580 6581 addrconf_verify(); 6582 6583 rtnl_af_register(&inet6_ops); 6584 6585 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6586 NULL); 6587 if (err < 0) 6588 goto errout; 6589 6590 /* Only the first call to __rtnl_register can fail */ 6591 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6592 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6593 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6594 inet6_dump_ifaddr, NULL); 6595 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6596 inet6_dump_ifmcaddr, NULL); 6597 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6598 inet6_dump_ifacaddr, NULL); 6599 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6600 inet6_netconf_dump_devconf, NULL); 6601 6602 ipv6_addr_label_rtnl_register(); 6603 6604 return 0; 6605 errout: 6606 rtnl_af_unregister(&inet6_ops); 6607 unregister_netdevice_notifier(&ipv6_dev_notf); 6608 errlo: 6609 destroy_workqueue(addrconf_wq); 6610 out_nowq: 6611 unregister_pernet_subsys(&addrconf_ops); 6612 out_addrlabel: 6613 ipv6_addr_label_cleanup(); 6614 out: 6615 return err; 6616 } 6617 6618 void addrconf_cleanup(void) 6619 { 6620 struct net_device *dev; 6621 int i; 6622 6623 unregister_netdevice_notifier(&ipv6_dev_notf); 6624 unregister_pernet_subsys(&addrconf_ops); 6625 ipv6_addr_label_cleanup(); 6626 6627 rtnl_lock(); 6628 6629 __rtnl_af_unregister(&inet6_ops); 6630 6631 /* clean dev list */ 6632 for_each_netdev(&init_net, dev) { 6633 if (__in6_dev_get(dev) == NULL) 6634 continue; 6635 addrconf_ifdown(dev, 1); 6636 } 6637 addrconf_ifdown(init_net.loopback_dev, 2); 6638 6639 /* 6640 * Check hash table. 6641 */ 6642 spin_lock_bh(&addrconf_hash_lock); 6643 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6644 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6645 spin_unlock_bh(&addrconf_hash_lock); 6646 cancel_delayed_work(&addr_chk_work); 6647 rtnl_unlock(); 6648 6649 destroy_workqueue(addrconf_wq); 6650 } 6651