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 struct in6_validator_info i6vi; 967 unsigned int hash; 968 int err = 0; 969 int addr_type = ipv6_addr_type(addr); 970 971 if (addr_type == IPV6_ADDR_ANY || 972 addr_type & IPV6_ADDR_MULTICAST || 973 (!(idev->dev->flags & IFF_LOOPBACK) && 974 addr_type & IPV6_ADDR_LOOPBACK)) 975 return ERR_PTR(-EADDRNOTAVAIL); 976 977 rcu_read_lock_bh(); 978 979 in6_dev_hold(idev); 980 981 if (idev->dead) { 982 err = -ENODEV; /*XXX*/ 983 goto out2; 984 } 985 986 if (idev->cnf.disable_ipv6) { 987 err = -EACCES; 988 goto out2; 989 } 990 991 i6vi.i6vi_addr = *addr; 992 i6vi.i6vi_dev = idev; 993 rcu_read_unlock_bh(); 994 995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 996 997 rcu_read_lock_bh(); 998 err = notifier_to_errno(err); 999 if (err) 1000 goto out2; 1001 1002 spin_lock(&addrconf_hash_lock); 1003 1004 /* Ignore adding duplicate addresses on an interface */ 1005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 1006 ADBG("ipv6_add_addr: already assigned\n"); 1007 err = -EEXIST; 1008 goto out; 1009 } 1010 1011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 1012 1013 if (!ifa) { 1014 ADBG("ipv6_add_addr: malloc failed\n"); 1015 err = -ENOBUFS; 1016 goto out; 1017 } 1018 1019 rt = addrconf_dst_alloc(idev, addr, false); 1020 if (IS_ERR(rt)) { 1021 err = PTR_ERR(rt); 1022 goto out; 1023 } 1024 1025 if (net->ipv6.devconf_all->disable_policy || 1026 idev->cnf.disable_policy) 1027 rt->dst.flags |= DST_NOPOLICY; 1028 1029 neigh_parms_data_state_setall(idev->nd_parms); 1030 1031 ifa->addr = *addr; 1032 if (peer_addr) 1033 ifa->peer_addr = *peer_addr; 1034 1035 spin_lock_init(&ifa->lock); 1036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1037 INIT_HLIST_NODE(&ifa->addr_lst); 1038 ifa->scope = scope; 1039 ifa->prefix_len = pfxlen; 1040 ifa->flags = flags; 1041 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1042 if (!(flags & IFA_F_NODAD)) 1043 ifa->flags |= IFA_F_TENTATIVE; 1044 ifa->valid_lft = valid_lft; 1045 ifa->prefered_lft = prefered_lft; 1046 ifa->cstamp = ifa->tstamp = jiffies; 1047 ifa->tokenized = false; 1048 1049 ifa->rt = rt; 1050 1051 ifa->idev = idev; 1052 /* For caller */ 1053 in6_ifa_hold(ifa); 1054 1055 /* Add to big hash table */ 1056 hash = inet6_addr_hash(addr); 1057 1058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1059 spin_unlock(&addrconf_hash_lock); 1060 1061 write_lock(&idev->lock); 1062 /* Add to inet6_dev unicast addr list. */ 1063 ipv6_link_dev_addr(idev, ifa); 1064 1065 if (ifa->flags&IFA_F_TEMPORARY) { 1066 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1067 in6_ifa_hold(ifa); 1068 } 1069 1070 in6_ifa_hold(ifa); 1071 write_unlock(&idev->lock); 1072 out2: 1073 rcu_read_unlock_bh(); 1074 1075 if (likely(err == 0)) 1076 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1077 else { 1078 kfree(ifa); 1079 in6_dev_put(idev); 1080 ifa = ERR_PTR(err); 1081 } 1082 1083 return ifa; 1084 out: 1085 spin_unlock(&addrconf_hash_lock); 1086 goto out2; 1087 } 1088 1089 enum cleanup_prefix_rt_t { 1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1093 }; 1094 1095 /* 1096 * Check, whether the prefix for ifp would still need a prefix route 1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1098 * constants. 1099 * 1100 * 1) we don't purge prefix if address was not permanent. 1101 * prefix is managed by its own lifetime. 1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1103 * 3) if there are no addresses, delete prefix. 1104 * 4) if there are still other permanent address(es), 1105 * corresponding prefix is still permanent. 1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1107 * don't purge the prefix, assume user space is managing it. 1108 * 6) otherwise, update prefix lifetime to the 1109 * longest valid lifetime among the corresponding 1110 * addresses on the device. 1111 * Note: subsequent RA will update lifetime. 1112 **/ 1113 static enum cleanup_prefix_rt_t 1114 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1115 { 1116 struct inet6_ifaddr *ifa; 1117 struct inet6_dev *idev = ifp->idev; 1118 unsigned long lifetime; 1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1120 1121 *expires = jiffies; 1122 1123 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1124 if (ifa == ifp) 1125 continue; 1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1127 ifp->prefix_len)) 1128 continue; 1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1130 return CLEANUP_PREFIX_RT_NOP; 1131 1132 action = CLEANUP_PREFIX_RT_EXPIRE; 1133 1134 spin_lock(&ifa->lock); 1135 1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1137 /* 1138 * Note: Because this address is 1139 * not permanent, lifetime < 1140 * LONG_MAX / HZ here. 1141 */ 1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1143 *expires = ifa->tstamp + lifetime * HZ; 1144 spin_unlock(&ifa->lock); 1145 } 1146 1147 return action; 1148 } 1149 1150 static void 1151 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1152 { 1153 struct rt6_info *rt; 1154 1155 rt = addrconf_get_prefix_route(&ifp->addr, 1156 ifp->prefix_len, 1157 ifp->idev->dev, 1158 0, RTF_GATEWAY | RTF_DEFAULT); 1159 if (rt) { 1160 if (del_rt) 1161 ip6_del_rt(rt); 1162 else { 1163 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1164 rt6_set_expires(rt, expires); 1165 ip6_rt_put(rt); 1166 } 1167 } 1168 } 1169 1170 1171 /* This function wants to get referenced ifp and releases it before return */ 1172 1173 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1174 { 1175 int state; 1176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1177 unsigned long expires; 1178 1179 ASSERT_RTNL(); 1180 1181 spin_lock_bh(&ifp->lock); 1182 state = ifp->state; 1183 ifp->state = INET6_IFADDR_STATE_DEAD; 1184 spin_unlock_bh(&ifp->lock); 1185 1186 if (state == INET6_IFADDR_STATE_DEAD) 1187 goto out; 1188 1189 spin_lock_bh(&addrconf_hash_lock); 1190 hlist_del_init_rcu(&ifp->addr_lst); 1191 spin_unlock_bh(&addrconf_hash_lock); 1192 1193 write_lock_bh(&ifp->idev->lock); 1194 1195 if (ifp->flags&IFA_F_TEMPORARY) { 1196 list_del(&ifp->tmp_list); 1197 if (ifp->ifpub) { 1198 in6_ifa_put(ifp->ifpub); 1199 ifp->ifpub = NULL; 1200 } 1201 __in6_ifa_put(ifp); 1202 } 1203 1204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1205 action = check_cleanup_prefix_route(ifp, &expires); 1206 1207 list_del_init(&ifp->if_list); 1208 __in6_ifa_put(ifp); 1209 1210 write_unlock_bh(&ifp->idev->lock); 1211 1212 addrconf_del_dad_work(ifp); 1213 1214 ipv6_ifa_notify(RTM_DELADDR, ifp); 1215 1216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1217 1218 if (action != CLEANUP_PREFIX_RT_NOP) { 1219 cleanup_prefix_route(ifp, expires, 1220 action == CLEANUP_PREFIX_RT_DEL); 1221 } 1222 1223 /* clean up prefsrc entries */ 1224 rt6_remove_prefsrc(ifp); 1225 out: 1226 in6_ifa_put(ifp); 1227 } 1228 1229 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1230 { 1231 struct inet6_dev *idev = ifp->idev; 1232 struct in6_addr addr, *tmpaddr; 1233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1234 unsigned long regen_advance; 1235 int tmp_plen; 1236 int ret = 0; 1237 u32 addr_flags; 1238 unsigned long now = jiffies; 1239 long max_desync_factor; 1240 s32 cnf_temp_preferred_lft; 1241 1242 write_lock_bh(&idev->lock); 1243 if (ift) { 1244 spin_lock_bh(&ift->lock); 1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1246 spin_unlock_bh(&ift->lock); 1247 tmpaddr = &addr; 1248 } else { 1249 tmpaddr = NULL; 1250 } 1251 retry: 1252 in6_dev_hold(idev); 1253 if (idev->cnf.use_tempaddr <= 0) { 1254 write_unlock_bh(&idev->lock); 1255 pr_info("%s: use_tempaddr is disabled\n", __func__); 1256 in6_dev_put(idev); 1257 ret = -1; 1258 goto out; 1259 } 1260 spin_lock_bh(&ifp->lock); 1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1262 idev->cnf.use_tempaddr = -1; /*XXX*/ 1263 spin_unlock_bh(&ifp->lock); 1264 write_unlock_bh(&idev->lock); 1265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1266 __func__); 1267 in6_dev_put(idev); 1268 ret = -1; 1269 goto out; 1270 } 1271 in6_ifa_hold(ifp); 1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1273 ipv6_try_regen_rndid(idev, tmpaddr); 1274 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1275 age = (now - ifp->tstamp) / HZ; 1276 1277 regen_advance = idev->cnf.regen_max_retry * 1278 idev->cnf.dad_transmits * 1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1280 1281 /* recalculate max_desync_factor each time and update 1282 * idev->desync_factor if it's larger 1283 */ 1284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1285 max_desync_factor = min_t(__u32, 1286 idev->cnf.max_desync_factor, 1287 cnf_temp_preferred_lft - regen_advance); 1288 1289 if (unlikely(idev->desync_factor > max_desync_factor)) { 1290 if (max_desync_factor > 0) { 1291 get_random_bytes(&idev->desync_factor, 1292 sizeof(idev->desync_factor)); 1293 idev->desync_factor %= max_desync_factor; 1294 } else { 1295 idev->desync_factor = 0; 1296 } 1297 } 1298 1299 tmp_valid_lft = min_t(__u32, 1300 ifp->valid_lft, 1301 idev->cnf.temp_valid_lft + age); 1302 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1303 idev->desync_factor; 1304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1305 tmp_plen = ifp->prefix_len; 1306 tmp_tstamp = ifp->tstamp; 1307 spin_unlock_bh(&ifp->lock); 1308 1309 write_unlock_bh(&idev->lock); 1310 1311 /* A temporary address is created only if this calculated Preferred 1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1313 * an implementation must not create a temporary address with a zero 1314 * Preferred Lifetime. 1315 * Use age calculation as in addrconf_verify to avoid unnecessary 1316 * temporary addresses being generated. 1317 */ 1318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1319 if (tmp_prefered_lft <= regen_advance + age) { 1320 in6_ifa_put(ifp); 1321 in6_dev_put(idev); 1322 ret = -1; 1323 goto out; 1324 } 1325 1326 addr_flags = IFA_F_TEMPORARY; 1327 /* set in addrconf_prefix_rcv() */ 1328 if (ifp->flags & IFA_F_OPTIMISTIC) 1329 addr_flags |= IFA_F_OPTIMISTIC; 1330 1331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1332 ipv6_addr_scope(&addr), addr_flags, 1333 tmp_valid_lft, tmp_prefered_lft); 1334 if (IS_ERR(ift)) { 1335 in6_ifa_put(ifp); 1336 in6_dev_put(idev); 1337 pr_info("%s: retry temporary address regeneration\n", __func__); 1338 tmpaddr = &addr; 1339 write_lock_bh(&idev->lock); 1340 goto retry; 1341 } 1342 1343 spin_lock_bh(&ift->lock); 1344 ift->ifpub = ifp; 1345 ift->cstamp = now; 1346 ift->tstamp = tmp_tstamp; 1347 spin_unlock_bh(&ift->lock); 1348 1349 addrconf_dad_start(ift); 1350 in6_ifa_put(ift); 1351 in6_dev_put(idev); 1352 out: 1353 return ret; 1354 } 1355 1356 /* 1357 * Choose an appropriate source address (RFC3484) 1358 */ 1359 enum { 1360 IPV6_SADDR_RULE_INIT = 0, 1361 IPV6_SADDR_RULE_LOCAL, 1362 IPV6_SADDR_RULE_SCOPE, 1363 IPV6_SADDR_RULE_PREFERRED, 1364 #ifdef CONFIG_IPV6_MIP6 1365 IPV6_SADDR_RULE_HOA, 1366 #endif 1367 IPV6_SADDR_RULE_OIF, 1368 IPV6_SADDR_RULE_LABEL, 1369 IPV6_SADDR_RULE_PRIVACY, 1370 IPV6_SADDR_RULE_ORCHID, 1371 IPV6_SADDR_RULE_PREFIX, 1372 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1374 #endif 1375 IPV6_SADDR_RULE_MAX 1376 }; 1377 1378 struct ipv6_saddr_score { 1379 int rule; 1380 int addr_type; 1381 struct inet6_ifaddr *ifa; 1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1383 int scopedist; 1384 int matchlen; 1385 }; 1386 1387 struct ipv6_saddr_dst { 1388 const struct in6_addr *addr; 1389 int ifindex; 1390 int scope; 1391 int label; 1392 unsigned int prefs; 1393 }; 1394 1395 static inline int ipv6_saddr_preferred(int type) 1396 { 1397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1398 return 1; 1399 return 0; 1400 } 1401 1402 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1403 { 1404 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1405 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1406 #else 1407 return false; 1408 #endif 1409 } 1410 1411 static int ipv6_get_saddr_eval(struct net *net, 1412 struct ipv6_saddr_score *score, 1413 struct ipv6_saddr_dst *dst, 1414 int i) 1415 { 1416 int ret; 1417 1418 if (i <= score->rule) { 1419 switch (i) { 1420 case IPV6_SADDR_RULE_SCOPE: 1421 ret = score->scopedist; 1422 break; 1423 case IPV6_SADDR_RULE_PREFIX: 1424 ret = score->matchlen; 1425 break; 1426 default: 1427 ret = !!test_bit(i, score->scorebits); 1428 } 1429 goto out; 1430 } 1431 1432 switch (i) { 1433 case IPV6_SADDR_RULE_INIT: 1434 /* Rule 0: remember if hiscore is not ready yet */ 1435 ret = !!score->ifa; 1436 break; 1437 case IPV6_SADDR_RULE_LOCAL: 1438 /* Rule 1: Prefer same address */ 1439 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1440 break; 1441 case IPV6_SADDR_RULE_SCOPE: 1442 /* Rule 2: Prefer appropriate scope 1443 * 1444 * ret 1445 * ^ 1446 * -1 | d 15 1447 * ---+--+-+---> scope 1448 * | 1449 * | d is scope of the destination. 1450 * B-d | \ 1451 * | \ <- smaller scope is better if 1452 * B-15 | \ if scope is enough for destination. 1453 * | ret = B - scope (-1 <= scope >= d <= 15). 1454 * d-C-1 | / 1455 * |/ <- greater is better 1456 * -C / if scope is not enough for destination. 1457 * /| ret = scope - C (-1 <= d < scope <= 15). 1458 * 1459 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1460 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1461 * Assume B = 0 and we get C > 29. 1462 */ 1463 ret = __ipv6_addr_src_scope(score->addr_type); 1464 if (ret >= dst->scope) 1465 ret = -ret; 1466 else 1467 ret -= 128; /* 30 is enough */ 1468 score->scopedist = ret; 1469 break; 1470 case IPV6_SADDR_RULE_PREFERRED: 1471 { 1472 /* Rule 3: Avoid deprecated and optimistic addresses */ 1473 u8 avoid = IFA_F_DEPRECATED; 1474 1475 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1476 avoid |= IFA_F_OPTIMISTIC; 1477 ret = ipv6_saddr_preferred(score->addr_type) || 1478 !(score->ifa->flags & avoid); 1479 break; 1480 } 1481 #ifdef CONFIG_IPV6_MIP6 1482 case IPV6_SADDR_RULE_HOA: 1483 { 1484 /* Rule 4: Prefer home address */ 1485 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1486 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1487 break; 1488 } 1489 #endif 1490 case IPV6_SADDR_RULE_OIF: 1491 /* Rule 5: Prefer outgoing interface */ 1492 ret = (!dst->ifindex || 1493 dst->ifindex == score->ifa->idev->dev->ifindex); 1494 break; 1495 case IPV6_SADDR_RULE_LABEL: 1496 /* Rule 6: Prefer matching label */ 1497 ret = ipv6_addr_label(net, 1498 &score->ifa->addr, score->addr_type, 1499 score->ifa->idev->dev->ifindex) == dst->label; 1500 break; 1501 case IPV6_SADDR_RULE_PRIVACY: 1502 { 1503 /* Rule 7: Prefer public address 1504 * Note: prefer temporary address if use_tempaddr >= 2 1505 */ 1506 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1507 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1508 score->ifa->idev->cnf.use_tempaddr >= 2; 1509 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1510 break; 1511 } 1512 case IPV6_SADDR_RULE_ORCHID: 1513 /* Rule 8-: Prefer ORCHID vs ORCHID or 1514 * non-ORCHID vs non-ORCHID 1515 */ 1516 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1517 ipv6_addr_orchid(dst->addr)); 1518 break; 1519 case IPV6_SADDR_RULE_PREFIX: 1520 /* Rule 8: Use longest matching prefix */ 1521 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1522 if (ret > score->ifa->prefix_len) 1523 ret = score->ifa->prefix_len; 1524 score->matchlen = ret; 1525 break; 1526 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1527 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1528 /* Optimistic addresses still have lower precedence than other 1529 * preferred addresses. 1530 */ 1531 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1532 break; 1533 #endif 1534 default: 1535 ret = 0; 1536 } 1537 1538 if (ret) 1539 __set_bit(i, score->scorebits); 1540 score->rule = i; 1541 out: 1542 return ret; 1543 } 1544 1545 static int __ipv6_dev_get_saddr(struct net *net, 1546 struct ipv6_saddr_dst *dst, 1547 struct inet6_dev *idev, 1548 struct ipv6_saddr_score *scores, 1549 int hiscore_idx) 1550 { 1551 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1552 1553 read_lock_bh(&idev->lock); 1554 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1555 int i; 1556 1557 /* 1558 * - Tentative Address (RFC2462 section 5.4) 1559 * - A tentative address is not considered 1560 * "assigned to an interface" in the traditional 1561 * sense, unless it is also flagged as optimistic. 1562 * - Candidate Source Address (section 4) 1563 * - In any case, anycast addresses, multicast 1564 * addresses, and the unspecified address MUST 1565 * NOT be included in a candidate set. 1566 */ 1567 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1568 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1569 continue; 1570 1571 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1572 1573 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1574 score->addr_type & IPV6_ADDR_MULTICAST)) { 1575 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1576 idev->dev->name); 1577 continue; 1578 } 1579 1580 score->rule = -1; 1581 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1582 1583 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1584 int minihiscore, miniscore; 1585 1586 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1587 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1588 1589 if (minihiscore > miniscore) { 1590 if (i == IPV6_SADDR_RULE_SCOPE && 1591 score->scopedist > 0) { 1592 /* 1593 * special case: 1594 * each remaining entry 1595 * has too small (not enough) 1596 * scope, because ifa entries 1597 * are sorted by their scope 1598 * values. 1599 */ 1600 goto out; 1601 } 1602 break; 1603 } else if (minihiscore < miniscore) { 1604 if (hiscore->ifa) 1605 in6_ifa_put(hiscore->ifa); 1606 1607 in6_ifa_hold(score->ifa); 1608 1609 swap(hiscore, score); 1610 hiscore_idx = 1 - hiscore_idx; 1611 1612 /* restore our iterator */ 1613 score->ifa = hiscore->ifa; 1614 1615 break; 1616 } 1617 } 1618 } 1619 out: 1620 read_unlock_bh(&idev->lock); 1621 return hiscore_idx; 1622 } 1623 1624 static int ipv6_get_saddr_master(struct net *net, 1625 const struct net_device *dst_dev, 1626 const struct net_device *master, 1627 struct ipv6_saddr_dst *dst, 1628 struct ipv6_saddr_score *scores, 1629 int hiscore_idx) 1630 { 1631 struct inet6_dev *idev; 1632 1633 idev = __in6_dev_get(dst_dev); 1634 if (idev) 1635 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1636 scores, hiscore_idx); 1637 1638 idev = __in6_dev_get(master); 1639 if (idev) 1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1641 scores, hiscore_idx); 1642 1643 return hiscore_idx; 1644 } 1645 1646 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1647 const struct in6_addr *daddr, unsigned int prefs, 1648 struct in6_addr *saddr) 1649 { 1650 struct ipv6_saddr_score scores[2], *hiscore; 1651 struct ipv6_saddr_dst dst; 1652 struct inet6_dev *idev; 1653 struct net_device *dev; 1654 int dst_type; 1655 bool use_oif_addr = false; 1656 int hiscore_idx = 0; 1657 1658 dst_type = __ipv6_addr_type(daddr); 1659 dst.addr = daddr; 1660 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1661 dst.scope = __ipv6_addr_src_scope(dst_type); 1662 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1663 dst.prefs = prefs; 1664 1665 scores[hiscore_idx].rule = -1; 1666 scores[hiscore_idx].ifa = NULL; 1667 1668 rcu_read_lock(); 1669 1670 /* Candidate Source Address (section 4) 1671 * - multicast and link-local destination address, 1672 * the set of candidate source address MUST only 1673 * include addresses assigned to interfaces 1674 * belonging to the same link as the outgoing 1675 * interface. 1676 * (- For site-local destination addresses, the 1677 * set of candidate source addresses MUST only 1678 * include addresses assigned to interfaces 1679 * belonging to the same site as the outgoing 1680 * interface.) 1681 * - "It is RECOMMENDED that the candidate source addresses 1682 * be the set of unicast addresses assigned to the 1683 * interface that will be used to send to the destination 1684 * (the 'outgoing' interface)." (RFC 6724) 1685 */ 1686 if (dst_dev) { 1687 idev = __in6_dev_get(dst_dev); 1688 if ((dst_type & IPV6_ADDR_MULTICAST) || 1689 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1690 (idev && idev->cnf.use_oif_addrs_only)) { 1691 use_oif_addr = true; 1692 } 1693 } 1694 1695 if (use_oif_addr) { 1696 if (idev) 1697 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1698 } else { 1699 const struct net_device *master; 1700 int master_idx = 0; 1701 1702 /* if dst_dev exists and is enslaved to an L3 device, then 1703 * prefer addresses from dst_dev and then the master over 1704 * any other enslaved devices in the L3 domain. 1705 */ 1706 master = l3mdev_master_dev_rcu(dst_dev); 1707 if (master) { 1708 master_idx = master->ifindex; 1709 1710 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1711 master, &dst, 1712 scores, hiscore_idx); 1713 1714 if (scores[hiscore_idx].ifa) 1715 goto out; 1716 } 1717 1718 for_each_netdev_rcu(net, dev) { 1719 /* only consider addresses on devices in the 1720 * same L3 domain 1721 */ 1722 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1723 continue; 1724 idev = __in6_dev_get(dev); 1725 if (!idev) 1726 continue; 1727 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1728 } 1729 } 1730 1731 out: 1732 rcu_read_unlock(); 1733 1734 hiscore = &scores[hiscore_idx]; 1735 if (!hiscore->ifa) 1736 return -EADDRNOTAVAIL; 1737 1738 *saddr = hiscore->ifa->addr; 1739 in6_ifa_put(hiscore->ifa); 1740 return 0; 1741 } 1742 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1743 1744 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1745 u32 banned_flags) 1746 { 1747 struct inet6_ifaddr *ifp; 1748 int err = -EADDRNOTAVAIL; 1749 1750 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1751 if (ifp->scope > IFA_LINK) 1752 break; 1753 if (ifp->scope == IFA_LINK && 1754 !(ifp->flags & banned_flags)) { 1755 *addr = ifp->addr; 1756 err = 0; 1757 break; 1758 } 1759 } 1760 return err; 1761 } 1762 1763 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1764 u32 banned_flags) 1765 { 1766 struct inet6_dev *idev; 1767 int err = -EADDRNOTAVAIL; 1768 1769 rcu_read_lock(); 1770 idev = __in6_dev_get(dev); 1771 if (idev) { 1772 read_lock_bh(&idev->lock); 1773 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1774 read_unlock_bh(&idev->lock); 1775 } 1776 rcu_read_unlock(); 1777 return err; 1778 } 1779 1780 static int ipv6_count_addresses(struct inet6_dev *idev) 1781 { 1782 int cnt = 0; 1783 struct inet6_ifaddr *ifp; 1784 1785 read_lock_bh(&idev->lock); 1786 list_for_each_entry(ifp, &idev->addr_list, if_list) 1787 cnt++; 1788 read_unlock_bh(&idev->lock); 1789 return cnt; 1790 } 1791 1792 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1793 const struct net_device *dev, int strict) 1794 { 1795 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1796 } 1797 EXPORT_SYMBOL(ipv6_chk_addr); 1798 1799 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1800 const struct net_device *dev, int strict, 1801 u32 banned_flags) 1802 { 1803 struct inet6_ifaddr *ifp; 1804 unsigned int hash = inet6_addr_hash(addr); 1805 u32 ifp_flags; 1806 1807 rcu_read_lock_bh(); 1808 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1809 if (!net_eq(dev_net(ifp->idev->dev), net)) 1810 continue; 1811 /* Decouple optimistic from tentative for evaluation here. 1812 * Ban optimistic addresses explicitly, when required. 1813 */ 1814 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1815 ? (ifp->flags&~IFA_F_TENTATIVE) 1816 : ifp->flags; 1817 if (ipv6_addr_equal(&ifp->addr, addr) && 1818 !(ifp_flags&banned_flags) && 1819 (!dev || ifp->idev->dev == dev || 1820 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1821 rcu_read_unlock_bh(); 1822 return 1; 1823 } 1824 } 1825 1826 rcu_read_unlock_bh(); 1827 return 0; 1828 } 1829 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1830 1831 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1832 struct net_device *dev) 1833 { 1834 unsigned int hash = inet6_addr_hash(addr); 1835 struct inet6_ifaddr *ifp; 1836 1837 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1838 if (!net_eq(dev_net(ifp->idev->dev), net)) 1839 continue; 1840 if (ipv6_addr_equal(&ifp->addr, addr)) { 1841 if (!dev || ifp->idev->dev == dev) 1842 return true; 1843 } 1844 } 1845 return false; 1846 } 1847 1848 /* Compares an address/prefix_len with addresses on device @dev. 1849 * If one is found it returns true. 1850 */ 1851 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1852 const unsigned int prefix_len, struct net_device *dev) 1853 { 1854 struct inet6_dev *idev; 1855 struct inet6_ifaddr *ifa; 1856 bool ret = false; 1857 1858 rcu_read_lock(); 1859 idev = __in6_dev_get(dev); 1860 if (idev) { 1861 read_lock_bh(&idev->lock); 1862 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1863 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1864 if (ret) 1865 break; 1866 } 1867 read_unlock_bh(&idev->lock); 1868 } 1869 rcu_read_unlock(); 1870 1871 return ret; 1872 } 1873 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1874 1875 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1876 { 1877 struct inet6_dev *idev; 1878 struct inet6_ifaddr *ifa; 1879 int onlink; 1880 1881 onlink = 0; 1882 rcu_read_lock(); 1883 idev = __in6_dev_get(dev); 1884 if (idev) { 1885 read_lock_bh(&idev->lock); 1886 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1887 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1888 ifa->prefix_len); 1889 if (onlink) 1890 break; 1891 } 1892 read_unlock_bh(&idev->lock); 1893 } 1894 rcu_read_unlock(); 1895 return onlink; 1896 } 1897 EXPORT_SYMBOL(ipv6_chk_prefix); 1898 1899 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1900 struct net_device *dev, int strict) 1901 { 1902 struct inet6_ifaddr *ifp, *result = NULL; 1903 unsigned int hash = inet6_addr_hash(addr); 1904 1905 rcu_read_lock_bh(); 1906 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1907 if (!net_eq(dev_net(ifp->idev->dev), net)) 1908 continue; 1909 if (ipv6_addr_equal(&ifp->addr, addr)) { 1910 if (!dev || ifp->idev->dev == dev || 1911 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1912 result = ifp; 1913 in6_ifa_hold(ifp); 1914 break; 1915 } 1916 } 1917 } 1918 rcu_read_unlock_bh(); 1919 1920 return result; 1921 } 1922 1923 /* Gets referenced address, destroys ifaddr */ 1924 1925 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1926 { 1927 if (dad_failed) 1928 ifp->flags |= IFA_F_DADFAILED; 1929 1930 if (ifp->flags&IFA_F_PERMANENT) { 1931 spin_lock_bh(&ifp->lock); 1932 addrconf_del_dad_work(ifp); 1933 ifp->flags |= IFA_F_TENTATIVE; 1934 spin_unlock_bh(&ifp->lock); 1935 if (dad_failed) 1936 ipv6_ifa_notify(0, ifp); 1937 in6_ifa_put(ifp); 1938 } else if (ifp->flags&IFA_F_TEMPORARY) { 1939 struct inet6_ifaddr *ifpub; 1940 spin_lock_bh(&ifp->lock); 1941 ifpub = ifp->ifpub; 1942 if (ifpub) { 1943 in6_ifa_hold(ifpub); 1944 spin_unlock_bh(&ifp->lock); 1945 ipv6_create_tempaddr(ifpub, ifp); 1946 in6_ifa_put(ifpub); 1947 } else { 1948 spin_unlock_bh(&ifp->lock); 1949 } 1950 ipv6_del_addr(ifp); 1951 } else { 1952 ipv6_del_addr(ifp); 1953 } 1954 } 1955 1956 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1957 { 1958 int err = -ENOENT; 1959 1960 spin_lock_bh(&ifp->lock); 1961 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1962 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1963 err = 0; 1964 } 1965 spin_unlock_bh(&ifp->lock); 1966 1967 return err; 1968 } 1969 1970 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1971 { 1972 struct inet6_dev *idev = ifp->idev; 1973 struct net *net = dev_net(ifp->idev->dev); 1974 1975 if (addrconf_dad_end(ifp)) { 1976 in6_ifa_put(ifp); 1977 return; 1978 } 1979 1980 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1981 ifp->idev->dev->name, &ifp->addr); 1982 1983 spin_lock_bh(&ifp->lock); 1984 1985 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1986 int scope = ifp->scope; 1987 u32 flags = ifp->flags; 1988 struct in6_addr new_addr; 1989 struct inet6_ifaddr *ifp2; 1990 u32 valid_lft, preferred_lft; 1991 int pfxlen = ifp->prefix_len; 1992 int retries = ifp->stable_privacy_retry + 1; 1993 1994 if (retries > net->ipv6.sysctl.idgen_retries) { 1995 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1996 ifp->idev->dev->name); 1997 goto errdad; 1998 } 1999 2000 new_addr = ifp->addr; 2001 if (ipv6_generate_stable_address(&new_addr, retries, 2002 idev)) 2003 goto errdad; 2004 2005 valid_lft = ifp->valid_lft; 2006 preferred_lft = ifp->prefered_lft; 2007 2008 spin_unlock_bh(&ifp->lock); 2009 2010 if (idev->cnf.max_addresses && 2011 ipv6_count_addresses(idev) >= 2012 idev->cnf.max_addresses) 2013 goto lock_errdad; 2014 2015 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2016 ifp->idev->dev->name); 2017 2018 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2019 scope, flags, valid_lft, 2020 preferred_lft); 2021 if (IS_ERR(ifp2)) 2022 goto lock_errdad; 2023 2024 spin_lock_bh(&ifp2->lock); 2025 ifp2->stable_privacy_retry = retries; 2026 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2027 spin_unlock_bh(&ifp2->lock); 2028 2029 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2030 in6_ifa_put(ifp2); 2031 lock_errdad: 2032 spin_lock_bh(&ifp->lock); 2033 } 2034 2035 errdad: 2036 /* transition from _POSTDAD to _ERRDAD */ 2037 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2038 spin_unlock_bh(&ifp->lock); 2039 2040 addrconf_mod_dad_work(ifp, 0); 2041 in6_ifa_put(ifp); 2042 } 2043 2044 /* Join to solicited addr multicast group. 2045 * caller must hold RTNL */ 2046 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2047 { 2048 struct in6_addr maddr; 2049 2050 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2051 return; 2052 2053 addrconf_addr_solict_mult(addr, &maddr); 2054 ipv6_dev_mc_inc(dev, &maddr); 2055 } 2056 2057 /* caller must hold RTNL */ 2058 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2059 { 2060 struct in6_addr maddr; 2061 2062 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2063 return; 2064 2065 addrconf_addr_solict_mult(addr, &maddr); 2066 __ipv6_dev_mc_dec(idev, &maddr); 2067 } 2068 2069 /* caller must hold RTNL */ 2070 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2071 { 2072 struct in6_addr addr; 2073 2074 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2075 return; 2076 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2077 if (ipv6_addr_any(&addr)) 2078 return; 2079 __ipv6_dev_ac_inc(ifp->idev, &addr); 2080 } 2081 2082 /* caller must hold RTNL */ 2083 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2084 { 2085 struct in6_addr addr; 2086 2087 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2088 return; 2089 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2090 if (ipv6_addr_any(&addr)) 2091 return; 2092 __ipv6_dev_ac_dec(ifp->idev, &addr); 2093 } 2094 2095 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2096 { 2097 switch (dev->addr_len) { 2098 case ETH_ALEN: 2099 memcpy(eui, dev->dev_addr, 3); 2100 eui[3] = 0xFF; 2101 eui[4] = 0xFE; 2102 memcpy(eui + 5, dev->dev_addr + 3, 3); 2103 break; 2104 case EUI64_ADDR_LEN: 2105 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2106 eui[0] ^= 2; 2107 break; 2108 default: 2109 return -1; 2110 } 2111 2112 return 0; 2113 } 2114 2115 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2116 { 2117 union fwnet_hwaddr *ha; 2118 2119 if (dev->addr_len != FWNET_ALEN) 2120 return -1; 2121 2122 ha = (union fwnet_hwaddr *)dev->dev_addr; 2123 2124 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2125 eui[0] ^= 2; 2126 return 0; 2127 } 2128 2129 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2130 { 2131 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2132 if (dev->addr_len != ARCNET_ALEN) 2133 return -1; 2134 memset(eui, 0, 7); 2135 eui[7] = *(u8 *)dev->dev_addr; 2136 return 0; 2137 } 2138 2139 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2140 { 2141 if (dev->addr_len != INFINIBAND_ALEN) 2142 return -1; 2143 memcpy(eui, dev->dev_addr + 12, 8); 2144 eui[0] |= 2; 2145 return 0; 2146 } 2147 2148 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2149 { 2150 if (addr == 0) 2151 return -1; 2152 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2153 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2154 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2155 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2156 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2157 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2158 eui[1] = 0; 2159 eui[2] = 0x5E; 2160 eui[3] = 0xFE; 2161 memcpy(eui + 4, &addr, 4); 2162 return 0; 2163 } 2164 2165 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2166 { 2167 if (dev->priv_flags & IFF_ISATAP) 2168 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2169 return -1; 2170 } 2171 2172 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2173 { 2174 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2175 } 2176 2177 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2178 { 2179 memcpy(eui, dev->perm_addr, 3); 2180 memcpy(eui + 5, dev->perm_addr + 3, 3); 2181 eui[3] = 0xFF; 2182 eui[4] = 0xFE; 2183 eui[0] ^= 2; 2184 return 0; 2185 } 2186 2187 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2188 { 2189 switch (dev->type) { 2190 case ARPHRD_ETHER: 2191 case ARPHRD_FDDI: 2192 return addrconf_ifid_eui48(eui, dev); 2193 case ARPHRD_ARCNET: 2194 return addrconf_ifid_arcnet(eui, dev); 2195 case ARPHRD_INFINIBAND: 2196 return addrconf_ifid_infiniband(eui, dev); 2197 case ARPHRD_SIT: 2198 return addrconf_ifid_sit(eui, dev); 2199 case ARPHRD_IPGRE: 2200 case ARPHRD_TUNNEL: 2201 return addrconf_ifid_gre(eui, dev); 2202 case ARPHRD_6LOWPAN: 2203 return addrconf_ifid_6lowpan(eui, dev); 2204 case ARPHRD_IEEE1394: 2205 return addrconf_ifid_ieee1394(eui, dev); 2206 case ARPHRD_TUNNEL6: 2207 case ARPHRD_IP6GRE: 2208 return addrconf_ifid_ip6tnl(eui, dev); 2209 } 2210 return -1; 2211 } 2212 2213 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2214 { 2215 int err = -1; 2216 struct inet6_ifaddr *ifp; 2217 2218 read_lock_bh(&idev->lock); 2219 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2220 if (ifp->scope > IFA_LINK) 2221 break; 2222 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2223 memcpy(eui, ifp->addr.s6_addr+8, 8); 2224 err = 0; 2225 break; 2226 } 2227 } 2228 read_unlock_bh(&idev->lock); 2229 return err; 2230 } 2231 2232 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2233 static void ipv6_regen_rndid(struct inet6_dev *idev) 2234 { 2235 regen: 2236 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2237 idev->rndid[0] &= ~0x02; 2238 2239 /* 2240 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2241 * check if generated address is not inappropriate 2242 * 2243 * - Reserved subnet anycast (RFC 2526) 2244 * 11111101 11....11 1xxxxxxx 2245 * - ISATAP (RFC4214) 6.1 2246 * 00-00-5E-FE-xx-xx-xx-xx 2247 * - value 0 2248 * - XXX: already assigned to an address on the device 2249 */ 2250 if (idev->rndid[0] == 0xfd && 2251 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2252 (idev->rndid[7]&0x80)) 2253 goto regen; 2254 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2255 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2256 goto regen; 2257 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2258 goto regen; 2259 } 2260 } 2261 2262 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2263 { 2264 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2265 ipv6_regen_rndid(idev); 2266 } 2267 2268 /* 2269 * Add prefix route. 2270 */ 2271 2272 static void 2273 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2274 unsigned long expires, u32 flags) 2275 { 2276 struct fib6_config cfg = { 2277 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2278 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2279 .fc_ifindex = dev->ifindex, 2280 .fc_expires = expires, 2281 .fc_dst_len = plen, 2282 .fc_flags = RTF_UP | flags, 2283 .fc_nlinfo.nl_net = dev_net(dev), 2284 .fc_protocol = RTPROT_KERNEL, 2285 }; 2286 2287 cfg.fc_dst = *pfx; 2288 2289 /* Prevent useless cloning on PtP SIT. 2290 This thing is done here expecting that the whole 2291 class of non-broadcast devices need not cloning. 2292 */ 2293 #if IS_ENABLED(CONFIG_IPV6_SIT) 2294 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2295 cfg.fc_flags |= RTF_NONEXTHOP; 2296 #endif 2297 2298 ip6_route_add(&cfg, NULL); 2299 } 2300 2301 2302 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2303 int plen, 2304 const struct net_device *dev, 2305 u32 flags, u32 noflags) 2306 { 2307 struct fib6_node *fn; 2308 struct rt6_info *rt = NULL; 2309 struct fib6_table *table; 2310 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2311 2312 table = fib6_get_table(dev_net(dev), tb_id); 2313 if (!table) 2314 return NULL; 2315 2316 read_lock_bh(&table->tb6_lock); 2317 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2318 if (!fn) 2319 goto out; 2320 2321 noflags |= RTF_CACHE; 2322 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2323 if (rt->dst.dev->ifindex != dev->ifindex) 2324 continue; 2325 if ((rt->rt6i_flags & flags) != flags) 2326 continue; 2327 if ((rt->rt6i_flags & noflags) != 0) 2328 continue; 2329 dst_hold(&rt->dst); 2330 break; 2331 } 2332 out: 2333 read_unlock_bh(&table->tb6_lock); 2334 return rt; 2335 } 2336 2337 2338 /* Create "default" multicast route to the interface */ 2339 2340 static void addrconf_add_mroute(struct net_device *dev) 2341 { 2342 struct fib6_config cfg = { 2343 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2344 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2345 .fc_ifindex = dev->ifindex, 2346 .fc_dst_len = 8, 2347 .fc_flags = RTF_UP, 2348 .fc_nlinfo.nl_net = dev_net(dev), 2349 }; 2350 2351 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2352 2353 ip6_route_add(&cfg, NULL); 2354 } 2355 2356 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2357 { 2358 struct inet6_dev *idev; 2359 2360 ASSERT_RTNL(); 2361 2362 idev = ipv6_find_idev(dev); 2363 if (!idev) 2364 return ERR_PTR(-ENOBUFS); 2365 2366 if (idev->cnf.disable_ipv6) 2367 return ERR_PTR(-EACCES); 2368 2369 /* Add default multicast route */ 2370 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2371 addrconf_add_mroute(dev); 2372 2373 return idev; 2374 } 2375 2376 static void manage_tempaddrs(struct inet6_dev *idev, 2377 struct inet6_ifaddr *ifp, 2378 __u32 valid_lft, __u32 prefered_lft, 2379 bool create, unsigned long now) 2380 { 2381 u32 flags; 2382 struct inet6_ifaddr *ift; 2383 2384 read_lock_bh(&idev->lock); 2385 /* update all temporary addresses in the list */ 2386 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2387 int age, max_valid, max_prefered; 2388 2389 if (ifp != ift->ifpub) 2390 continue; 2391 2392 /* RFC 4941 section 3.3: 2393 * If a received option will extend the lifetime of a public 2394 * address, the lifetimes of temporary addresses should 2395 * be extended, subject to the overall constraint that no 2396 * temporary addresses should ever remain "valid" or "preferred" 2397 * for a time longer than (TEMP_VALID_LIFETIME) or 2398 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2399 */ 2400 age = (now - ift->cstamp) / HZ; 2401 max_valid = idev->cnf.temp_valid_lft - age; 2402 if (max_valid < 0) 2403 max_valid = 0; 2404 2405 max_prefered = idev->cnf.temp_prefered_lft - 2406 idev->desync_factor - age; 2407 if (max_prefered < 0) 2408 max_prefered = 0; 2409 2410 if (valid_lft > max_valid) 2411 valid_lft = max_valid; 2412 2413 if (prefered_lft > max_prefered) 2414 prefered_lft = max_prefered; 2415 2416 spin_lock(&ift->lock); 2417 flags = ift->flags; 2418 ift->valid_lft = valid_lft; 2419 ift->prefered_lft = prefered_lft; 2420 ift->tstamp = now; 2421 if (prefered_lft > 0) 2422 ift->flags &= ~IFA_F_DEPRECATED; 2423 2424 spin_unlock(&ift->lock); 2425 if (!(flags&IFA_F_TENTATIVE)) 2426 ipv6_ifa_notify(0, ift); 2427 } 2428 2429 if ((create || list_empty(&idev->tempaddr_list)) && 2430 idev->cnf.use_tempaddr > 0) { 2431 /* When a new public address is created as described 2432 * in [ADDRCONF], also create a new temporary address. 2433 * Also create a temporary address if it's enabled but 2434 * no temporary address currently exists. 2435 */ 2436 read_unlock_bh(&idev->lock); 2437 ipv6_create_tempaddr(ifp, NULL); 2438 } else { 2439 read_unlock_bh(&idev->lock); 2440 } 2441 } 2442 2443 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2444 { 2445 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2446 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2447 } 2448 2449 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2450 const struct prefix_info *pinfo, 2451 struct inet6_dev *in6_dev, 2452 const struct in6_addr *addr, int addr_type, 2453 u32 addr_flags, bool sllao, bool tokenized, 2454 __u32 valid_lft, u32 prefered_lft) 2455 { 2456 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2457 int create = 0, update_lft = 0; 2458 2459 if (!ifp && valid_lft) { 2460 int max_addresses = in6_dev->cnf.max_addresses; 2461 2462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2463 if (in6_dev->cnf.optimistic_dad && 2464 !net->ipv6.devconf_all->forwarding && sllao) 2465 addr_flags |= IFA_F_OPTIMISTIC; 2466 #endif 2467 2468 /* Do not allow to create too much of autoconfigured 2469 * addresses; this would be too easy way to crash kernel. 2470 */ 2471 if (!max_addresses || 2472 ipv6_count_addresses(in6_dev) < max_addresses) 2473 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2474 pinfo->prefix_len, 2475 addr_type&IPV6_ADDR_SCOPE_MASK, 2476 addr_flags, valid_lft, 2477 prefered_lft); 2478 2479 if (IS_ERR_OR_NULL(ifp)) 2480 return -1; 2481 2482 update_lft = 0; 2483 create = 1; 2484 spin_lock_bh(&ifp->lock); 2485 ifp->flags |= IFA_F_MANAGETEMPADDR; 2486 ifp->cstamp = jiffies; 2487 ifp->tokenized = tokenized; 2488 spin_unlock_bh(&ifp->lock); 2489 addrconf_dad_start(ifp); 2490 } 2491 2492 if (ifp) { 2493 u32 flags; 2494 unsigned long now; 2495 u32 stored_lft; 2496 2497 /* update lifetime (RFC2462 5.5.3 e) */ 2498 spin_lock_bh(&ifp->lock); 2499 now = jiffies; 2500 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2501 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2502 else 2503 stored_lft = 0; 2504 if (!update_lft && !create && stored_lft) { 2505 const u32 minimum_lft = min_t(u32, 2506 stored_lft, MIN_VALID_LIFETIME); 2507 valid_lft = max(valid_lft, minimum_lft); 2508 2509 /* RFC4862 Section 5.5.3e: 2510 * "Note that the preferred lifetime of the 2511 * corresponding address is always reset to 2512 * the Preferred Lifetime in the received 2513 * Prefix Information option, regardless of 2514 * whether the valid lifetime is also reset or 2515 * ignored." 2516 * 2517 * So we should always update prefered_lft here. 2518 */ 2519 update_lft = 1; 2520 } 2521 2522 if (update_lft) { 2523 ifp->valid_lft = valid_lft; 2524 ifp->prefered_lft = prefered_lft; 2525 ifp->tstamp = now; 2526 flags = ifp->flags; 2527 ifp->flags &= ~IFA_F_DEPRECATED; 2528 spin_unlock_bh(&ifp->lock); 2529 2530 if (!(flags&IFA_F_TENTATIVE)) 2531 ipv6_ifa_notify(0, ifp); 2532 } else 2533 spin_unlock_bh(&ifp->lock); 2534 2535 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2536 create, now); 2537 2538 in6_ifa_put(ifp); 2539 addrconf_verify(); 2540 } 2541 2542 return 0; 2543 } 2544 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2545 2546 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2547 { 2548 struct prefix_info *pinfo; 2549 __u32 valid_lft; 2550 __u32 prefered_lft; 2551 int addr_type, err; 2552 u32 addr_flags = 0; 2553 struct inet6_dev *in6_dev; 2554 struct net *net = dev_net(dev); 2555 2556 pinfo = (struct prefix_info *) opt; 2557 2558 if (len < sizeof(struct prefix_info)) { 2559 ADBG("addrconf: prefix option too short\n"); 2560 return; 2561 } 2562 2563 /* 2564 * Validation checks ([ADDRCONF], page 19) 2565 */ 2566 2567 addr_type = ipv6_addr_type(&pinfo->prefix); 2568 2569 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2570 return; 2571 2572 valid_lft = ntohl(pinfo->valid); 2573 prefered_lft = ntohl(pinfo->prefered); 2574 2575 if (prefered_lft > valid_lft) { 2576 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2577 return; 2578 } 2579 2580 in6_dev = in6_dev_get(dev); 2581 2582 if (!in6_dev) { 2583 net_dbg_ratelimited("addrconf: device %s not configured\n", 2584 dev->name); 2585 return; 2586 } 2587 2588 /* 2589 * Two things going on here: 2590 * 1) Add routes for on-link prefixes 2591 * 2) Configure prefixes with the auto flag set 2592 */ 2593 2594 if (pinfo->onlink) { 2595 struct rt6_info *rt; 2596 unsigned long rt_expires; 2597 2598 /* Avoid arithmetic overflow. Really, we could 2599 * save rt_expires in seconds, likely valid_lft, 2600 * but it would require division in fib gc, that it 2601 * not good. 2602 */ 2603 if (HZ > USER_HZ) 2604 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2605 else 2606 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2607 2608 if (addrconf_finite_timeout(rt_expires)) 2609 rt_expires *= HZ; 2610 2611 rt = addrconf_get_prefix_route(&pinfo->prefix, 2612 pinfo->prefix_len, 2613 dev, 2614 RTF_ADDRCONF | RTF_PREFIX_RT, 2615 RTF_GATEWAY | RTF_DEFAULT); 2616 2617 if (rt) { 2618 /* Autoconf prefix route */ 2619 if (valid_lft == 0) { 2620 ip6_del_rt(rt); 2621 rt = NULL; 2622 } else if (addrconf_finite_timeout(rt_expires)) { 2623 /* not infinity */ 2624 rt6_set_expires(rt, jiffies + rt_expires); 2625 } else { 2626 rt6_clean_expires(rt); 2627 } 2628 } else if (valid_lft) { 2629 clock_t expires = 0; 2630 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2631 if (addrconf_finite_timeout(rt_expires)) { 2632 /* not infinity */ 2633 flags |= RTF_EXPIRES; 2634 expires = jiffies_to_clock_t(rt_expires); 2635 } 2636 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2637 dev, expires, flags); 2638 } 2639 ip6_rt_put(rt); 2640 } 2641 2642 /* Try to figure out our local address for this prefix */ 2643 2644 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2645 struct in6_addr addr; 2646 bool tokenized = false, dev_addr_generated = false; 2647 2648 if (pinfo->prefix_len == 64) { 2649 memcpy(&addr, &pinfo->prefix, 8); 2650 2651 if (!ipv6_addr_any(&in6_dev->token)) { 2652 read_lock_bh(&in6_dev->lock); 2653 memcpy(addr.s6_addr + 8, 2654 in6_dev->token.s6_addr + 8, 8); 2655 read_unlock_bh(&in6_dev->lock); 2656 tokenized = true; 2657 } else if (is_addr_mode_generate_stable(in6_dev) && 2658 !ipv6_generate_stable_address(&addr, 0, 2659 in6_dev)) { 2660 addr_flags |= IFA_F_STABLE_PRIVACY; 2661 goto ok; 2662 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2663 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2664 goto put; 2665 } else { 2666 dev_addr_generated = true; 2667 } 2668 goto ok; 2669 } 2670 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2671 pinfo->prefix_len); 2672 goto put; 2673 2674 ok: 2675 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2676 &addr, addr_type, 2677 addr_flags, sllao, 2678 tokenized, valid_lft, 2679 prefered_lft); 2680 if (err) 2681 goto put; 2682 2683 /* Ignore error case here because previous prefix add addr was 2684 * successful which will be notified. 2685 */ 2686 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2687 addr_type, addr_flags, sllao, 2688 tokenized, valid_lft, 2689 prefered_lft, 2690 dev_addr_generated); 2691 } 2692 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2693 put: 2694 in6_dev_put(in6_dev); 2695 } 2696 2697 /* 2698 * Set destination address. 2699 * Special case for SIT interfaces where we create a new "virtual" 2700 * device. 2701 */ 2702 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2703 { 2704 struct in6_ifreq ireq; 2705 struct net_device *dev; 2706 int err = -EINVAL; 2707 2708 rtnl_lock(); 2709 2710 err = -EFAULT; 2711 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2712 goto err_exit; 2713 2714 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2715 2716 err = -ENODEV; 2717 if (!dev) 2718 goto err_exit; 2719 2720 #if IS_ENABLED(CONFIG_IPV6_SIT) 2721 if (dev->type == ARPHRD_SIT) { 2722 const struct net_device_ops *ops = dev->netdev_ops; 2723 struct ifreq ifr; 2724 struct ip_tunnel_parm p; 2725 2726 err = -EADDRNOTAVAIL; 2727 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2728 goto err_exit; 2729 2730 memset(&p, 0, sizeof(p)); 2731 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2732 p.iph.saddr = 0; 2733 p.iph.version = 4; 2734 p.iph.ihl = 5; 2735 p.iph.protocol = IPPROTO_IPV6; 2736 p.iph.ttl = 64; 2737 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2738 2739 if (ops->ndo_do_ioctl) { 2740 mm_segment_t oldfs = get_fs(); 2741 2742 set_fs(KERNEL_DS); 2743 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2744 set_fs(oldfs); 2745 } else 2746 err = -EOPNOTSUPP; 2747 2748 if (err == 0) { 2749 err = -ENOBUFS; 2750 dev = __dev_get_by_name(net, p.name); 2751 if (!dev) 2752 goto err_exit; 2753 err = dev_open(dev); 2754 } 2755 } 2756 #endif 2757 2758 err_exit: 2759 rtnl_unlock(); 2760 return err; 2761 } 2762 2763 static int ipv6_mc_config(struct sock *sk, bool join, 2764 const struct in6_addr *addr, int ifindex) 2765 { 2766 int ret; 2767 2768 ASSERT_RTNL(); 2769 2770 lock_sock(sk); 2771 if (join) 2772 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2773 else 2774 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2775 release_sock(sk); 2776 2777 return ret; 2778 } 2779 2780 /* 2781 * Manual configuration of address on an interface 2782 */ 2783 static int inet6_addr_add(struct net *net, int ifindex, 2784 const struct in6_addr *pfx, 2785 const struct in6_addr *peer_pfx, 2786 unsigned int plen, __u32 ifa_flags, 2787 __u32 prefered_lft, __u32 valid_lft) 2788 { 2789 struct inet6_ifaddr *ifp; 2790 struct inet6_dev *idev; 2791 struct net_device *dev; 2792 unsigned long timeout; 2793 clock_t expires; 2794 int scope; 2795 u32 flags; 2796 2797 ASSERT_RTNL(); 2798 2799 if (plen > 128) 2800 return -EINVAL; 2801 2802 /* check the lifetime */ 2803 if (!valid_lft || prefered_lft > valid_lft) 2804 return -EINVAL; 2805 2806 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2807 return -EINVAL; 2808 2809 dev = __dev_get_by_index(net, ifindex); 2810 if (!dev) 2811 return -ENODEV; 2812 2813 idev = addrconf_add_dev(dev); 2814 if (IS_ERR(idev)) 2815 return PTR_ERR(idev); 2816 2817 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2818 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2819 true, pfx, ifindex); 2820 2821 if (ret < 0) 2822 return ret; 2823 } 2824 2825 scope = ipv6_addr_scope(pfx); 2826 2827 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2828 if (addrconf_finite_timeout(timeout)) { 2829 expires = jiffies_to_clock_t(timeout * HZ); 2830 valid_lft = timeout; 2831 flags = RTF_EXPIRES; 2832 } else { 2833 expires = 0; 2834 flags = 0; 2835 ifa_flags |= IFA_F_PERMANENT; 2836 } 2837 2838 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2839 if (addrconf_finite_timeout(timeout)) { 2840 if (timeout == 0) 2841 ifa_flags |= IFA_F_DEPRECATED; 2842 prefered_lft = timeout; 2843 } 2844 2845 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2846 valid_lft, prefered_lft); 2847 2848 if (!IS_ERR(ifp)) { 2849 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2850 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2851 expires, flags); 2852 } 2853 2854 /* 2855 * Note that section 3.1 of RFC 4429 indicates 2856 * that the Optimistic flag should not be set for 2857 * manually configured addresses 2858 */ 2859 addrconf_dad_start(ifp); 2860 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2861 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2862 true, jiffies); 2863 in6_ifa_put(ifp); 2864 addrconf_verify_rtnl(); 2865 return 0; 2866 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2867 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2868 false, pfx, ifindex); 2869 } 2870 2871 return PTR_ERR(ifp); 2872 } 2873 2874 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2875 const struct in6_addr *pfx, unsigned int plen) 2876 { 2877 struct inet6_ifaddr *ifp; 2878 struct inet6_dev *idev; 2879 struct net_device *dev; 2880 2881 if (plen > 128) 2882 return -EINVAL; 2883 2884 dev = __dev_get_by_index(net, ifindex); 2885 if (!dev) 2886 return -ENODEV; 2887 2888 idev = __in6_dev_get(dev); 2889 if (!idev) 2890 return -ENXIO; 2891 2892 read_lock_bh(&idev->lock); 2893 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2894 if (ifp->prefix_len == plen && 2895 ipv6_addr_equal(pfx, &ifp->addr)) { 2896 in6_ifa_hold(ifp); 2897 read_unlock_bh(&idev->lock); 2898 2899 if (!(ifp->flags & IFA_F_TEMPORARY) && 2900 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2901 manage_tempaddrs(idev, ifp, 0, 0, false, 2902 jiffies); 2903 ipv6_del_addr(ifp); 2904 addrconf_verify_rtnl(); 2905 if (ipv6_addr_is_multicast(pfx)) { 2906 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2907 false, pfx, dev->ifindex); 2908 } 2909 return 0; 2910 } 2911 } 2912 read_unlock_bh(&idev->lock); 2913 return -EADDRNOTAVAIL; 2914 } 2915 2916 2917 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2918 { 2919 struct in6_ifreq ireq; 2920 int err; 2921 2922 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2923 return -EPERM; 2924 2925 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2926 return -EFAULT; 2927 2928 rtnl_lock(); 2929 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2930 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2931 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2932 rtnl_unlock(); 2933 return err; 2934 } 2935 2936 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2937 { 2938 struct in6_ifreq ireq; 2939 int err; 2940 2941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2942 return -EPERM; 2943 2944 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2945 return -EFAULT; 2946 2947 rtnl_lock(); 2948 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2949 ireq.ifr6_prefixlen); 2950 rtnl_unlock(); 2951 return err; 2952 } 2953 2954 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2955 int plen, int scope) 2956 { 2957 struct inet6_ifaddr *ifp; 2958 2959 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2960 scope, IFA_F_PERMANENT, 2961 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2962 if (!IS_ERR(ifp)) { 2963 spin_lock_bh(&ifp->lock); 2964 ifp->flags &= ~IFA_F_TENTATIVE; 2965 spin_unlock_bh(&ifp->lock); 2966 rt_genid_bump_ipv6(dev_net(idev->dev)); 2967 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2968 in6_ifa_put(ifp); 2969 } 2970 } 2971 2972 #if IS_ENABLED(CONFIG_IPV6_SIT) 2973 static void sit_add_v4_addrs(struct inet6_dev *idev) 2974 { 2975 struct in6_addr addr; 2976 struct net_device *dev; 2977 struct net *net = dev_net(idev->dev); 2978 int scope, plen; 2979 u32 pflags = 0; 2980 2981 ASSERT_RTNL(); 2982 2983 memset(&addr, 0, sizeof(struct in6_addr)); 2984 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2985 2986 if (idev->dev->flags&IFF_POINTOPOINT) { 2987 addr.s6_addr32[0] = htonl(0xfe800000); 2988 scope = IFA_LINK; 2989 plen = 64; 2990 } else { 2991 scope = IPV6_ADDR_COMPATv4; 2992 plen = 96; 2993 pflags |= RTF_NONEXTHOP; 2994 } 2995 2996 if (addr.s6_addr32[3]) { 2997 add_addr(idev, &addr, plen, scope); 2998 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2999 return; 3000 } 3001 3002 for_each_netdev(net, dev) { 3003 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3004 if (in_dev && (dev->flags & IFF_UP)) { 3005 struct in_ifaddr *ifa; 3006 3007 int flag = scope; 3008 3009 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3010 3011 addr.s6_addr32[3] = ifa->ifa_local; 3012 3013 if (ifa->ifa_scope == RT_SCOPE_LINK) 3014 continue; 3015 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3016 if (idev->dev->flags&IFF_POINTOPOINT) 3017 continue; 3018 flag |= IFA_HOST; 3019 } 3020 3021 add_addr(idev, &addr, plen, flag); 3022 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3023 pflags); 3024 } 3025 } 3026 } 3027 } 3028 #endif 3029 3030 static void init_loopback(struct net_device *dev) 3031 { 3032 struct inet6_dev *idev; 3033 struct net_device *sp_dev; 3034 struct inet6_ifaddr *sp_ifa; 3035 struct rt6_info *sp_rt; 3036 3037 /* ::1 */ 3038 3039 ASSERT_RTNL(); 3040 3041 idev = ipv6_find_idev(dev); 3042 if (!idev) { 3043 pr_debug("%s: add_dev failed\n", __func__); 3044 return; 3045 } 3046 3047 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3048 3049 /* Add routes to other interface's IPv6 addresses */ 3050 for_each_netdev(dev_net(dev), sp_dev) { 3051 if (!strcmp(sp_dev->name, dev->name)) 3052 continue; 3053 3054 idev = __in6_dev_get(sp_dev); 3055 if (!idev) 3056 continue; 3057 3058 read_lock_bh(&idev->lock); 3059 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3060 3061 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3062 continue; 3063 3064 if (sp_ifa->rt) { 3065 /* This dst has been added to garbage list when 3066 * lo device down, release this obsolete dst and 3067 * reallocate a new router for ifa. 3068 */ 3069 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3070 ip6_rt_put(sp_ifa->rt); 3071 sp_ifa->rt = NULL; 3072 } else { 3073 continue; 3074 } 3075 } 3076 3077 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3078 3079 /* Failure cases are ignored */ 3080 if (!IS_ERR(sp_rt)) { 3081 sp_ifa->rt = sp_rt; 3082 ip6_ins_rt(sp_rt); 3083 } 3084 } 3085 read_unlock_bh(&idev->lock); 3086 } 3087 } 3088 3089 void addrconf_add_linklocal(struct inet6_dev *idev, 3090 const struct in6_addr *addr, u32 flags) 3091 { 3092 struct inet6_ifaddr *ifp; 3093 u32 addr_flags = flags | IFA_F_PERMANENT; 3094 3095 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3096 if (idev->cnf.optimistic_dad && 3097 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3098 addr_flags |= IFA_F_OPTIMISTIC; 3099 #endif 3100 3101 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3102 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3103 if (!IS_ERR(ifp)) { 3104 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3105 addrconf_dad_start(ifp); 3106 in6_ifa_put(ifp); 3107 } 3108 } 3109 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3110 3111 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3112 { 3113 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3114 return true; 3115 3116 if (address.s6_addr32[2] == htonl(0x02005eff) && 3117 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3118 return true; 3119 3120 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3121 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3122 return true; 3123 3124 return false; 3125 } 3126 3127 static int ipv6_generate_stable_address(struct in6_addr *address, 3128 u8 dad_count, 3129 const struct inet6_dev *idev) 3130 { 3131 static DEFINE_SPINLOCK(lock); 3132 static __u32 digest[SHA_DIGEST_WORDS]; 3133 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3134 3135 static union { 3136 char __data[SHA_MESSAGE_BYTES]; 3137 struct { 3138 struct in6_addr secret; 3139 __be32 prefix[2]; 3140 unsigned char hwaddr[MAX_ADDR_LEN]; 3141 u8 dad_count; 3142 } __packed; 3143 } data; 3144 3145 struct in6_addr secret; 3146 struct in6_addr temp; 3147 struct net *net = dev_net(idev->dev); 3148 3149 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3150 3151 if (idev->cnf.stable_secret.initialized) 3152 secret = idev->cnf.stable_secret.secret; 3153 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3154 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3155 else 3156 return -1; 3157 3158 retry: 3159 spin_lock_bh(&lock); 3160 3161 sha_init(digest); 3162 memset(&data, 0, sizeof(data)); 3163 memset(workspace, 0, sizeof(workspace)); 3164 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3165 data.prefix[0] = address->s6_addr32[0]; 3166 data.prefix[1] = address->s6_addr32[1]; 3167 data.secret = secret; 3168 data.dad_count = dad_count; 3169 3170 sha_transform(digest, data.__data, workspace); 3171 3172 temp = *address; 3173 temp.s6_addr32[2] = (__force __be32)digest[0]; 3174 temp.s6_addr32[3] = (__force __be32)digest[1]; 3175 3176 spin_unlock_bh(&lock); 3177 3178 if (ipv6_reserved_interfaceid(temp)) { 3179 dad_count++; 3180 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3181 return -1; 3182 goto retry; 3183 } 3184 3185 *address = temp; 3186 return 0; 3187 } 3188 3189 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3190 { 3191 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3192 3193 if (s->initialized) 3194 return; 3195 s = &idev->cnf.stable_secret; 3196 get_random_bytes(&s->secret, sizeof(s->secret)); 3197 s->initialized = true; 3198 } 3199 3200 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3201 { 3202 struct in6_addr addr; 3203 3204 /* no link local addresses on L3 master devices */ 3205 if (netif_is_l3_master(idev->dev)) 3206 return; 3207 3208 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3209 3210 switch (idev->cnf.addr_gen_mode) { 3211 case IN6_ADDR_GEN_MODE_RANDOM: 3212 ipv6_gen_mode_random_init(idev); 3213 /* fallthrough */ 3214 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3215 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3216 addrconf_add_linklocal(idev, &addr, 3217 IFA_F_STABLE_PRIVACY); 3218 else if (prefix_route) 3219 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3220 break; 3221 case IN6_ADDR_GEN_MODE_EUI64: 3222 /* addrconf_add_linklocal also adds a prefix_route and we 3223 * only need to care about prefix routes if ipv6_generate_eui64 3224 * couldn't generate one. 3225 */ 3226 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3227 addrconf_add_linklocal(idev, &addr, 0); 3228 else if (prefix_route) 3229 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3230 break; 3231 case IN6_ADDR_GEN_MODE_NONE: 3232 default: 3233 /* will not add any link local address */ 3234 break; 3235 } 3236 } 3237 3238 static void addrconf_dev_config(struct net_device *dev) 3239 { 3240 struct inet6_dev *idev; 3241 3242 ASSERT_RTNL(); 3243 3244 if ((dev->type != ARPHRD_ETHER) && 3245 (dev->type != ARPHRD_FDDI) && 3246 (dev->type != ARPHRD_ARCNET) && 3247 (dev->type != ARPHRD_INFINIBAND) && 3248 (dev->type != ARPHRD_IEEE1394) && 3249 (dev->type != ARPHRD_TUNNEL6) && 3250 (dev->type != ARPHRD_6LOWPAN) && 3251 (dev->type != ARPHRD_IP6GRE) && 3252 (dev->type != ARPHRD_IPGRE) && 3253 (dev->type != ARPHRD_TUNNEL) && 3254 (dev->type != ARPHRD_NONE)) { 3255 /* Alas, we support only Ethernet autoconfiguration. */ 3256 return; 3257 } 3258 3259 idev = addrconf_add_dev(dev); 3260 if (IS_ERR(idev)) 3261 return; 3262 3263 /* this device type has no EUI support */ 3264 if (dev->type == ARPHRD_NONE && 3265 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3266 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3267 3268 addrconf_addr_gen(idev, false); 3269 } 3270 3271 #if IS_ENABLED(CONFIG_IPV6_SIT) 3272 static void addrconf_sit_config(struct net_device *dev) 3273 { 3274 struct inet6_dev *idev; 3275 3276 ASSERT_RTNL(); 3277 3278 /* 3279 * Configure the tunnel with one of our IPv4 3280 * addresses... we should configure all of 3281 * our v4 addrs in the tunnel 3282 */ 3283 3284 idev = ipv6_find_idev(dev); 3285 if (!idev) { 3286 pr_debug("%s: add_dev failed\n", __func__); 3287 return; 3288 } 3289 3290 if (dev->priv_flags & IFF_ISATAP) { 3291 addrconf_addr_gen(idev, false); 3292 return; 3293 } 3294 3295 sit_add_v4_addrs(idev); 3296 3297 if (dev->flags&IFF_POINTOPOINT) 3298 addrconf_add_mroute(dev); 3299 } 3300 #endif 3301 3302 #if IS_ENABLED(CONFIG_NET_IPGRE) 3303 static void addrconf_gre_config(struct net_device *dev) 3304 { 3305 struct inet6_dev *idev; 3306 3307 ASSERT_RTNL(); 3308 3309 idev = ipv6_find_idev(dev); 3310 if (!idev) { 3311 pr_debug("%s: add_dev failed\n", __func__); 3312 return; 3313 } 3314 3315 addrconf_addr_gen(idev, true); 3316 if (dev->flags & IFF_POINTOPOINT) 3317 addrconf_add_mroute(dev); 3318 } 3319 #endif 3320 3321 static int fixup_permanent_addr(struct inet6_dev *idev, 3322 struct inet6_ifaddr *ifp) 3323 { 3324 /* rt6i_ref == 0 means the host route was removed from the 3325 * FIB, for example, if 'lo' device is taken down. In that 3326 * case regenerate the host route. 3327 */ 3328 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) { 3329 struct rt6_info *rt, *prev; 3330 3331 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3332 if (unlikely(IS_ERR(rt))) 3333 return PTR_ERR(rt); 3334 3335 /* ifp->rt can be accessed outside of rtnl */ 3336 spin_lock(&ifp->lock); 3337 prev = ifp->rt; 3338 ifp->rt = rt; 3339 spin_unlock(&ifp->lock); 3340 3341 ip6_rt_put(prev); 3342 } 3343 3344 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3345 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3346 idev->dev, 0, 0); 3347 } 3348 3349 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3350 addrconf_dad_start(ifp); 3351 3352 return 0; 3353 } 3354 3355 static void addrconf_permanent_addr(struct net_device *dev) 3356 { 3357 struct inet6_ifaddr *ifp, *tmp; 3358 struct inet6_dev *idev; 3359 3360 idev = __in6_dev_get(dev); 3361 if (!idev) 3362 return; 3363 3364 write_lock_bh(&idev->lock); 3365 3366 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3367 if ((ifp->flags & IFA_F_PERMANENT) && 3368 fixup_permanent_addr(idev, ifp) < 0) { 3369 write_unlock_bh(&idev->lock); 3370 ipv6_del_addr(ifp); 3371 write_lock_bh(&idev->lock); 3372 3373 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3374 idev->dev->name, &ifp->addr); 3375 } 3376 } 3377 3378 write_unlock_bh(&idev->lock); 3379 } 3380 3381 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3382 void *ptr) 3383 { 3384 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3385 struct netdev_notifier_changeupper_info *info; 3386 struct inet6_dev *idev = __in6_dev_get(dev); 3387 int run_pending = 0; 3388 int err; 3389 3390 switch (event) { 3391 case NETDEV_REGISTER: 3392 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3393 idev = ipv6_add_dev(dev); 3394 if (IS_ERR(idev)) 3395 return notifier_from_errno(PTR_ERR(idev)); 3396 } 3397 break; 3398 3399 case NETDEV_CHANGEMTU: 3400 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3401 if (dev->mtu < IPV6_MIN_MTU) { 3402 addrconf_ifdown(dev, 1); 3403 break; 3404 } 3405 3406 if (idev) { 3407 rt6_mtu_change(dev, dev->mtu); 3408 idev->cnf.mtu6 = dev->mtu; 3409 break; 3410 } 3411 3412 /* allocate new idev */ 3413 idev = ipv6_add_dev(dev); 3414 if (IS_ERR(idev)) 3415 break; 3416 3417 /* device is still not ready */ 3418 if (!(idev->if_flags & IF_READY)) 3419 break; 3420 3421 run_pending = 1; 3422 3423 /* fall through */ 3424 3425 case NETDEV_UP: 3426 case NETDEV_CHANGE: 3427 if (dev->flags & IFF_SLAVE) 3428 break; 3429 3430 if (idev && idev->cnf.disable_ipv6) 3431 break; 3432 3433 if (event == NETDEV_UP) { 3434 /* restore routes for permanent addresses */ 3435 addrconf_permanent_addr(dev); 3436 3437 if (!addrconf_qdisc_ok(dev)) { 3438 /* device is not ready yet. */ 3439 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3440 dev->name); 3441 break; 3442 } 3443 3444 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3445 idev = ipv6_add_dev(dev); 3446 3447 if (!IS_ERR_OR_NULL(idev)) { 3448 idev->if_flags |= IF_READY; 3449 run_pending = 1; 3450 } 3451 } else if (event == NETDEV_CHANGE) { 3452 if (!addrconf_qdisc_ok(dev)) { 3453 /* device is still not ready. */ 3454 break; 3455 } 3456 3457 if (idev) { 3458 if (idev->if_flags & IF_READY) { 3459 /* device is already configured - 3460 * but resend MLD reports, we might 3461 * have roamed and need to update 3462 * multicast snooping switches 3463 */ 3464 ipv6_mc_up(idev); 3465 break; 3466 } 3467 idev->if_flags |= IF_READY; 3468 } 3469 3470 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3471 dev->name); 3472 3473 run_pending = 1; 3474 } 3475 3476 switch (dev->type) { 3477 #if IS_ENABLED(CONFIG_IPV6_SIT) 3478 case ARPHRD_SIT: 3479 addrconf_sit_config(dev); 3480 break; 3481 #endif 3482 #if IS_ENABLED(CONFIG_NET_IPGRE) 3483 case ARPHRD_IPGRE: 3484 addrconf_gre_config(dev); 3485 break; 3486 #endif 3487 case ARPHRD_LOOPBACK: 3488 init_loopback(dev); 3489 break; 3490 3491 default: 3492 addrconf_dev_config(dev); 3493 break; 3494 } 3495 3496 if (!IS_ERR_OR_NULL(idev)) { 3497 if (run_pending) 3498 addrconf_dad_run(idev); 3499 3500 /* 3501 * If the MTU changed during the interface down, 3502 * when the interface up, the changed MTU must be 3503 * reflected in the idev as well as routers. 3504 */ 3505 if (idev->cnf.mtu6 != dev->mtu && 3506 dev->mtu >= IPV6_MIN_MTU) { 3507 rt6_mtu_change(dev, dev->mtu); 3508 idev->cnf.mtu6 = dev->mtu; 3509 } 3510 idev->tstamp = jiffies; 3511 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3512 3513 /* 3514 * If the changed mtu during down is lower than 3515 * IPV6_MIN_MTU stop IPv6 on this interface. 3516 */ 3517 if (dev->mtu < IPV6_MIN_MTU) 3518 addrconf_ifdown(dev, 1); 3519 } 3520 break; 3521 3522 case NETDEV_DOWN: 3523 case NETDEV_UNREGISTER: 3524 /* 3525 * Remove all addresses from this interface. 3526 */ 3527 addrconf_ifdown(dev, event != NETDEV_DOWN); 3528 break; 3529 3530 case NETDEV_CHANGENAME: 3531 if (idev) { 3532 snmp6_unregister_dev(idev); 3533 addrconf_sysctl_unregister(idev); 3534 err = addrconf_sysctl_register(idev); 3535 if (err) 3536 return notifier_from_errno(err); 3537 err = snmp6_register_dev(idev); 3538 if (err) { 3539 addrconf_sysctl_unregister(idev); 3540 return notifier_from_errno(err); 3541 } 3542 } 3543 break; 3544 3545 case NETDEV_PRE_TYPE_CHANGE: 3546 case NETDEV_POST_TYPE_CHANGE: 3547 if (idev) 3548 addrconf_type_change(dev, event); 3549 break; 3550 3551 case NETDEV_CHANGEUPPER: 3552 info = ptr; 3553 3554 /* flush all routes if dev is linked to or unlinked from 3555 * an L3 master device (e.g., VRF) 3556 */ 3557 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3558 addrconf_ifdown(dev, 0); 3559 } 3560 3561 return NOTIFY_OK; 3562 } 3563 3564 /* 3565 * addrconf module should be notified of a device going up 3566 */ 3567 static struct notifier_block ipv6_dev_notf = { 3568 .notifier_call = addrconf_notify, 3569 .priority = ADDRCONF_NOTIFY_PRIORITY, 3570 }; 3571 3572 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3573 { 3574 struct inet6_dev *idev; 3575 ASSERT_RTNL(); 3576 3577 idev = __in6_dev_get(dev); 3578 3579 if (event == NETDEV_POST_TYPE_CHANGE) 3580 ipv6_mc_remap(idev); 3581 else if (event == NETDEV_PRE_TYPE_CHANGE) 3582 ipv6_mc_unmap(idev); 3583 } 3584 3585 static bool addr_is_local(const struct in6_addr *addr) 3586 { 3587 return ipv6_addr_type(addr) & 3588 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3589 } 3590 3591 static int addrconf_ifdown(struct net_device *dev, int how) 3592 { 3593 struct net *net = dev_net(dev); 3594 struct inet6_dev *idev; 3595 struct inet6_ifaddr *ifa, *tmp; 3596 struct list_head del_list; 3597 int _keep_addr; 3598 bool keep_addr; 3599 int state, i; 3600 3601 ASSERT_RTNL(); 3602 3603 rt6_ifdown(net, dev); 3604 neigh_ifdown(&nd_tbl, dev); 3605 3606 idev = __in6_dev_get(dev); 3607 if (!idev) 3608 return -ENODEV; 3609 3610 /* 3611 * Step 1: remove reference to ipv6 device from parent device. 3612 * Do not dev_put! 3613 */ 3614 if (how) { 3615 idev->dead = 1; 3616 3617 /* protected by rtnl_lock */ 3618 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3619 3620 /* Step 1.5: remove snmp6 entry */ 3621 snmp6_unregister_dev(idev); 3622 3623 } 3624 3625 /* aggregate the system setting and interface setting */ 3626 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3627 if (!_keep_addr) 3628 _keep_addr = idev->cnf.keep_addr_on_down; 3629 3630 /* combine the user config with event to determine if permanent 3631 * addresses are to be removed from address hash table 3632 */ 3633 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3634 3635 /* Step 2: clear hash table */ 3636 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3637 struct hlist_head *h = &inet6_addr_lst[i]; 3638 3639 spin_lock_bh(&addrconf_hash_lock); 3640 restart: 3641 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3642 if (ifa->idev == idev) { 3643 addrconf_del_dad_work(ifa); 3644 /* combined flag + permanent flag decide if 3645 * address is retained on a down event 3646 */ 3647 if (!keep_addr || 3648 !(ifa->flags & IFA_F_PERMANENT) || 3649 addr_is_local(&ifa->addr)) { 3650 hlist_del_init_rcu(&ifa->addr_lst); 3651 goto restart; 3652 } 3653 } 3654 } 3655 spin_unlock_bh(&addrconf_hash_lock); 3656 } 3657 3658 write_lock_bh(&idev->lock); 3659 3660 addrconf_del_rs_timer(idev); 3661 3662 /* Step 2: clear flags for stateless addrconf */ 3663 if (!how) 3664 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3665 3666 /* Step 3: clear tempaddr list */ 3667 while (!list_empty(&idev->tempaddr_list)) { 3668 ifa = list_first_entry(&idev->tempaddr_list, 3669 struct inet6_ifaddr, tmp_list); 3670 list_del(&ifa->tmp_list); 3671 write_unlock_bh(&idev->lock); 3672 spin_lock_bh(&ifa->lock); 3673 3674 if (ifa->ifpub) { 3675 in6_ifa_put(ifa->ifpub); 3676 ifa->ifpub = NULL; 3677 } 3678 spin_unlock_bh(&ifa->lock); 3679 in6_ifa_put(ifa); 3680 write_lock_bh(&idev->lock); 3681 } 3682 3683 /* re-combine the user config with event to determine if permanent 3684 * addresses are to be removed from the interface list 3685 */ 3686 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3687 3688 INIT_LIST_HEAD(&del_list); 3689 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3690 struct rt6_info *rt = NULL; 3691 bool keep; 3692 3693 addrconf_del_dad_work(ifa); 3694 3695 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3696 !addr_is_local(&ifa->addr); 3697 if (!keep) 3698 list_move(&ifa->if_list, &del_list); 3699 3700 write_unlock_bh(&idev->lock); 3701 spin_lock_bh(&ifa->lock); 3702 3703 if (keep) { 3704 /* set state to skip the notifier below */ 3705 state = INET6_IFADDR_STATE_DEAD; 3706 ifa->state = INET6_IFADDR_STATE_PREDAD; 3707 if (!(ifa->flags & IFA_F_NODAD)) 3708 ifa->flags |= IFA_F_TENTATIVE; 3709 3710 rt = ifa->rt; 3711 ifa->rt = NULL; 3712 } else { 3713 state = ifa->state; 3714 ifa->state = INET6_IFADDR_STATE_DEAD; 3715 } 3716 3717 spin_unlock_bh(&ifa->lock); 3718 3719 if (rt) 3720 ip6_del_rt(rt); 3721 3722 if (state != INET6_IFADDR_STATE_DEAD) { 3723 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3724 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3725 } else { 3726 if (idev->cnf.forwarding) 3727 addrconf_leave_anycast(ifa); 3728 addrconf_leave_solict(ifa->idev, &ifa->addr); 3729 } 3730 3731 write_lock_bh(&idev->lock); 3732 } 3733 3734 write_unlock_bh(&idev->lock); 3735 3736 /* now clean up addresses to be removed */ 3737 while (!list_empty(&del_list)) { 3738 ifa = list_first_entry(&del_list, 3739 struct inet6_ifaddr, if_list); 3740 list_del(&ifa->if_list); 3741 3742 in6_ifa_put(ifa); 3743 } 3744 3745 /* Step 5: Discard anycast and multicast list */ 3746 if (how) { 3747 ipv6_ac_destroy_dev(idev); 3748 ipv6_mc_destroy_dev(idev); 3749 } else { 3750 ipv6_mc_down(idev); 3751 } 3752 3753 idev->tstamp = jiffies; 3754 3755 /* Last: Shot the device (if unregistered) */ 3756 if (how) { 3757 addrconf_sysctl_unregister(idev); 3758 neigh_parms_release(&nd_tbl, idev->nd_parms); 3759 neigh_ifdown(&nd_tbl, dev); 3760 in6_dev_put(idev); 3761 } 3762 return 0; 3763 } 3764 3765 static void addrconf_rs_timer(unsigned long data) 3766 { 3767 struct inet6_dev *idev = (struct inet6_dev *)data; 3768 struct net_device *dev = idev->dev; 3769 struct in6_addr lladdr; 3770 3771 write_lock(&idev->lock); 3772 if (idev->dead || !(idev->if_flags & IF_READY)) 3773 goto out; 3774 3775 if (!ipv6_accept_ra(idev)) 3776 goto out; 3777 3778 /* Announcement received after solicitation was sent */ 3779 if (idev->if_flags & IF_RA_RCVD) 3780 goto out; 3781 3782 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3783 write_unlock(&idev->lock); 3784 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3785 ndisc_send_rs(dev, &lladdr, 3786 &in6addr_linklocal_allrouters); 3787 else 3788 goto put; 3789 3790 write_lock(&idev->lock); 3791 idev->rs_interval = rfc3315_s14_backoff_update( 3792 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3793 /* The wait after the last probe can be shorter */ 3794 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3795 idev->cnf.rtr_solicits) ? 3796 idev->cnf.rtr_solicit_delay : 3797 idev->rs_interval); 3798 } else { 3799 /* 3800 * Note: we do not support deprecated "all on-link" 3801 * assumption any longer. 3802 */ 3803 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3804 } 3805 3806 out: 3807 write_unlock(&idev->lock); 3808 put: 3809 in6_dev_put(idev); 3810 } 3811 3812 /* 3813 * Duplicate Address Detection 3814 */ 3815 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3816 { 3817 unsigned long rand_num; 3818 struct inet6_dev *idev = ifp->idev; 3819 u64 nonce; 3820 3821 if (ifp->flags & IFA_F_OPTIMISTIC) 3822 rand_num = 0; 3823 else 3824 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3825 3826 nonce = 0; 3827 if (idev->cnf.enhanced_dad || 3828 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3829 do 3830 get_random_bytes(&nonce, 6); 3831 while (nonce == 0); 3832 } 3833 ifp->dad_nonce = nonce; 3834 ifp->dad_probes = idev->cnf.dad_transmits; 3835 addrconf_mod_dad_work(ifp, rand_num); 3836 } 3837 3838 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3839 { 3840 struct inet6_dev *idev = ifp->idev; 3841 struct net_device *dev = idev->dev; 3842 bool bump_id, notify = false; 3843 3844 addrconf_join_solict(dev, &ifp->addr); 3845 3846 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3847 3848 read_lock_bh(&idev->lock); 3849 spin_lock(&ifp->lock); 3850 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3851 goto out; 3852 3853 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3854 idev->cnf.accept_dad < 1 || 3855 !(ifp->flags&IFA_F_TENTATIVE) || 3856 ifp->flags & IFA_F_NODAD) { 3857 bump_id = ifp->flags & IFA_F_TENTATIVE; 3858 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3859 spin_unlock(&ifp->lock); 3860 read_unlock_bh(&idev->lock); 3861 3862 addrconf_dad_completed(ifp, bump_id); 3863 return; 3864 } 3865 3866 if (!(idev->if_flags & IF_READY)) { 3867 spin_unlock(&ifp->lock); 3868 read_unlock_bh(&idev->lock); 3869 /* 3870 * If the device is not ready: 3871 * - keep it tentative if it is a permanent address. 3872 * - otherwise, kill it. 3873 */ 3874 in6_ifa_hold(ifp); 3875 addrconf_dad_stop(ifp, 0); 3876 return; 3877 } 3878 3879 /* 3880 * Optimistic nodes can start receiving 3881 * Frames right away 3882 */ 3883 if (ifp->flags & IFA_F_OPTIMISTIC) { 3884 ip6_ins_rt(ifp->rt); 3885 if (ipv6_use_optimistic_addr(idev)) { 3886 /* Because optimistic nodes can use this address, 3887 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3888 */ 3889 notify = true; 3890 } 3891 } 3892 3893 addrconf_dad_kick(ifp); 3894 out: 3895 spin_unlock(&ifp->lock); 3896 read_unlock_bh(&idev->lock); 3897 if (notify) 3898 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3899 } 3900 3901 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3902 { 3903 bool begin_dad = false; 3904 3905 spin_lock_bh(&ifp->lock); 3906 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3907 ifp->state = INET6_IFADDR_STATE_PREDAD; 3908 begin_dad = true; 3909 } 3910 spin_unlock_bh(&ifp->lock); 3911 3912 if (begin_dad) 3913 addrconf_mod_dad_work(ifp, 0); 3914 } 3915 3916 static void addrconf_dad_work(struct work_struct *w) 3917 { 3918 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3919 struct inet6_ifaddr, 3920 dad_work); 3921 struct inet6_dev *idev = ifp->idev; 3922 bool bump_id, disable_ipv6 = false; 3923 struct in6_addr mcaddr; 3924 3925 enum { 3926 DAD_PROCESS, 3927 DAD_BEGIN, 3928 DAD_ABORT, 3929 } action = DAD_PROCESS; 3930 3931 rtnl_lock(); 3932 3933 spin_lock_bh(&ifp->lock); 3934 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3935 action = DAD_BEGIN; 3936 ifp->state = INET6_IFADDR_STATE_DAD; 3937 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3938 action = DAD_ABORT; 3939 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3940 3941 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3942 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3943 struct in6_addr addr; 3944 3945 addr.s6_addr32[0] = htonl(0xfe800000); 3946 addr.s6_addr32[1] = 0; 3947 3948 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3949 ipv6_addr_equal(&ifp->addr, &addr)) { 3950 /* DAD failed for link-local based on MAC */ 3951 idev->cnf.disable_ipv6 = 1; 3952 3953 pr_info("%s: IPv6 being disabled!\n", 3954 ifp->idev->dev->name); 3955 disable_ipv6 = true; 3956 } 3957 } 3958 } 3959 spin_unlock_bh(&ifp->lock); 3960 3961 if (action == DAD_BEGIN) { 3962 addrconf_dad_begin(ifp); 3963 goto out; 3964 } else if (action == DAD_ABORT) { 3965 in6_ifa_hold(ifp); 3966 addrconf_dad_stop(ifp, 1); 3967 if (disable_ipv6) 3968 addrconf_ifdown(idev->dev, 0); 3969 goto out; 3970 } 3971 3972 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3973 goto out; 3974 3975 write_lock_bh(&idev->lock); 3976 if (idev->dead || !(idev->if_flags & IF_READY)) { 3977 write_unlock_bh(&idev->lock); 3978 goto out; 3979 } 3980 3981 spin_lock(&ifp->lock); 3982 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3983 spin_unlock(&ifp->lock); 3984 write_unlock_bh(&idev->lock); 3985 goto out; 3986 } 3987 3988 if (ifp->dad_probes == 0) { 3989 /* 3990 * DAD was successful 3991 */ 3992 3993 bump_id = ifp->flags & IFA_F_TENTATIVE; 3994 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3995 spin_unlock(&ifp->lock); 3996 write_unlock_bh(&idev->lock); 3997 3998 addrconf_dad_completed(ifp, bump_id); 3999 4000 goto out; 4001 } 4002 4003 ifp->dad_probes--; 4004 addrconf_mod_dad_work(ifp, 4005 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4006 spin_unlock(&ifp->lock); 4007 write_unlock_bh(&idev->lock); 4008 4009 /* send a neighbour solicitation for our addr */ 4010 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4011 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4012 ifp->dad_nonce); 4013 out: 4014 in6_ifa_put(ifp); 4015 rtnl_unlock(); 4016 } 4017 4018 /* ifp->idev must be at least read locked */ 4019 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4020 { 4021 struct inet6_ifaddr *ifpiter; 4022 struct inet6_dev *idev = ifp->idev; 4023 4024 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4025 if (ifpiter->scope > IFA_LINK) 4026 break; 4027 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4028 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4029 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4030 IFA_F_PERMANENT) 4031 return false; 4032 } 4033 return true; 4034 } 4035 4036 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4037 { 4038 struct net_device *dev = ifp->idev->dev; 4039 struct in6_addr lladdr; 4040 bool send_rs, send_mld; 4041 4042 addrconf_del_dad_work(ifp); 4043 4044 /* 4045 * Configure the address for reception. Now it is valid. 4046 */ 4047 4048 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4049 4050 /* If added prefix is link local and we are prepared to process 4051 router advertisements, start sending router solicitations. 4052 */ 4053 4054 read_lock_bh(&ifp->idev->lock); 4055 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4056 send_rs = send_mld && 4057 ipv6_accept_ra(ifp->idev) && 4058 ifp->idev->cnf.rtr_solicits != 0 && 4059 (dev->flags&IFF_LOOPBACK) == 0; 4060 read_unlock_bh(&ifp->idev->lock); 4061 4062 /* While dad is in progress mld report's source address is in6_addrany. 4063 * Resend with proper ll now. 4064 */ 4065 if (send_mld) 4066 ipv6_mc_dad_complete(ifp->idev); 4067 4068 if (send_rs) { 4069 /* 4070 * If a host as already performed a random delay 4071 * [...] as part of DAD [...] there is no need 4072 * to delay again before sending the first RS 4073 */ 4074 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4075 return; 4076 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4077 4078 write_lock_bh(&ifp->idev->lock); 4079 spin_lock(&ifp->lock); 4080 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4081 ifp->idev->cnf.rtr_solicit_interval); 4082 ifp->idev->rs_probes = 1; 4083 ifp->idev->if_flags |= IF_RS_SENT; 4084 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4085 spin_unlock(&ifp->lock); 4086 write_unlock_bh(&ifp->idev->lock); 4087 } 4088 4089 if (bump_id) 4090 rt_genid_bump_ipv6(dev_net(dev)); 4091 4092 /* Make sure that a new temporary address will be created 4093 * before this temporary address becomes deprecated. 4094 */ 4095 if (ifp->flags & IFA_F_TEMPORARY) 4096 addrconf_verify_rtnl(); 4097 } 4098 4099 static void addrconf_dad_run(struct inet6_dev *idev) 4100 { 4101 struct inet6_ifaddr *ifp; 4102 4103 read_lock_bh(&idev->lock); 4104 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4105 spin_lock(&ifp->lock); 4106 if (ifp->flags & IFA_F_TENTATIVE && 4107 ifp->state == INET6_IFADDR_STATE_DAD) 4108 addrconf_dad_kick(ifp); 4109 spin_unlock(&ifp->lock); 4110 } 4111 read_unlock_bh(&idev->lock); 4112 } 4113 4114 #ifdef CONFIG_PROC_FS 4115 struct if6_iter_state { 4116 struct seq_net_private p; 4117 int bucket; 4118 int offset; 4119 }; 4120 4121 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4122 { 4123 struct inet6_ifaddr *ifa = NULL; 4124 struct if6_iter_state *state = seq->private; 4125 struct net *net = seq_file_net(seq); 4126 int p = 0; 4127 4128 /* initial bucket if pos is 0 */ 4129 if (pos == 0) { 4130 state->bucket = 0; 4131 state->offset = 0; 4132 } 4133 4134 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4135 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4136 addr_lst) { 4137 if (!net_eq(dev_net(ifa->idev->dev), net)) 4138 continue; 4139 /* sync with offset */ 4140 if (p < state->offset) { 4141 p++; 4142 continue; 4143 } 4144 state->offset++; 4145 return ifa; 4146 } 4147 4148 /* prepare for next bucket */ 4149 state->offset = 0; 4150 p = 0; 4151 } 4152 return NULL; 4153 } 4154 4155 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4156 struct inet6_ifaddr *ifa) 4157 { 4158 struct if6_iter_state *state = seq->private; 4159 struct net *net = seq_file_net(seq); 4160 4161 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4162 if (!net_eq(dev_net(ifa->idev->dev), net)) 4163 continue; 4164 state->offset++; 4165 return ifa; 4166 } 4167 4168 while (++state->bucket < IN6_ADDR_HSIZE) { 4169 state->offset = 0; 4170 hlist_for_each_entry_rcu_bh(ifa, 4171 &inet6_addr_lst[state->bucket], addr_lst) { 4172 if (!net_eq(dev_net(ifa->idev->dev), net)) 4173 continue; 4174 state->offset++; 4175 return ifa; 4176 } 4177 } 4178 4179 return NULL; 4180 } 4181 4182 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4183 __acquires(rcu_bh) 4184 { 4185 rcu_read_lock_bh(); 4186 return if6_get_first(seq, *pos); 4187 } 4188 4189 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4190 { 4191 struct inet6_ifaddr *ifa; 4192 4193 ifa = if6_get_next(seq, v); 4194 ++*pos; 4195 return ifa; 4196 } 4197 4198 static void if6_seq_stop(struct seq_file *seq, void *v) 4199 __releases(rcu_bh) 4200 { 4201 rcu_read_unlock_bh(); 4202 } 4203 4204 static int if6_seq_show(struct seq_file *seq, void *v) 4205 { 4206 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4207 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4208 &ifp->addr, 4209 ifp->idev->dev->ifindex, 4210 ifp->prefix_len, 4211 ifp->scope, 4212 (u8) ifp->flags, 4213 ifp->idev->dev->name); 4214 return 0; 4215 } 4216 4217 static const struct seq_operations if6_seq_ops = { 4218 .start = if6_seq_start, 4219 .next = if6_seq_next, 4220 .show = if6_seq_show, 4221 .stop = if6_seq_stop, 4222 }; 4223 4224 static int if6_seq_open(struct inode *inode, struct file *file) 4225 { 4226 return seq_open_net(inode, file, &if6_seq_ops, 4227 sizeof(struct if6_iter_state)); 4228 } 4229 4230 static const struct file_operations if6_fops = { 4231 .owner = THIS_MODULE, 4232 .open = if6_seq_open, 4233 .read = seq_read, 4234 .llseek = seq_lseek, 4235 .release = seq_release_net, 4236 }; 4237 4238 static int __net_init if6_proc_net_init(struct net *net) 4239 { 4240 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4241 return -ENOMEM; 4242 return 0; 4243 } 4244 4245 static void __net_exit if6_proc_net_exit(struct net *net) 4246 { 4247 remove_proc_entry("if_inet6", net->proc_net); 4248 } 4249 4250 static struct pernet_operations if6_proc_net_ops = { 4251 .init = if6_proc_net_init, 4252 .exit = if6_proc_net_exit, 4253 }; 4254 4255 int __init if6_proc_init(void) 4256 { 4257 return register_pernet_subsys(&if6_proc_net_ops); 4258 } 4259 4260 void if6_proc_exit(void) 4261 { 4262 unregister_pernet_subsys(&if6_proc_net_ops); 4263 } 4264 #endif /* CONFIG_PROC_FS */ 4265 4266 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4267 /* Check if address is a home address configured on any interface. */ 4268 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4269 { 4270 int ret = 0; 4271 struct inet6_ifaddr *ifp = NULL; 4272 unsigned int hash = inet6_addr_hash(addr); 4273 4274 rcu_read_lock_bh(); 4275 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4276 if (!net_eq(dev_net(ifp->idev->dev), net)) 4277 continue; 4278 if (ipv6_addr_equal(&ifp->addr, addr) && 4279 (ifp->flags & IFA_F_HOMEADDRESS)) { 4280 ret = 1; 4281 break; 4282 } 4283 } 4284 rcu_read_unlock_bh(); 4285 return ret; 4286 } 4287 #endif 4288 4289 /* 4290 * Periodic address status verification 4291 */ 4292 4293 static void addrconf_verify_rtnl(void) 4294 { 4295 unsigned long now, next, next_sec, next_sched; 4296 struct inet6_ifaddr *ifp; 4297 int i; 4298 4299 ASSERT_RTNL(); 4300 4301 rcu_read_lock_bh(); 4302 now = jiffies; 4303 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4304 4305 cancel_delayed_work(&addr_chk_work); 4306 4307 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4308 restart: 4309 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4310 unsigned long age; 4311 4312 /* When setting preferred_lft to a value not zero or 4313 * infinity, while valid_lft is infinity 4314 * IFA_F_PERMANENT has a non-infinity life time. 4315 */ 4316 if ((ifp->flags & IFA_F_PERMANENT) && 4317 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4318 continue; 4319 4320 spin_lock(&ifp->lock); 4321 /* We try to batch several events at once. */ 4322 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4323 4324 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4325 age >= ifp->valid_lft) { 4326 spin_unlock(&ifp->lock); 4327 in6_ifa_hold(ifp); 4328 ipv6_del_addr(ifp); 4329 goto restart; 4330 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4331 spin_unlock(&ifp->lock); 4332 continue; 4333 } else if (age >= ifp->prefered_lft) { 4334 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4335 int deprecate = 0; 4336 4337 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4338 deprecate = 1; 4339 ifp->flags |= IFA_F_DEPRECATED; 4340 } 4341 4342 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4343 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4344 next = ifp->tstamp + ifp->valid_lft * HZ; 4345 4346 spin_unlock(&ifp->lock); 4347 4348 if (deprecate) { 4349 in6_ifa_hold(ifp); 4350 4351 ipv6_ifa_notify(0, ifp); 4352 in6_ifa_put(ifp); 4353 goto restart; 4354 } 4355 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4356 !(ifp->flags&IFA_F_TENTATIVE)) { 4357 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4358 ifp->idev->cnf.dad_transmits * 4359 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4360 4361 if (age >= ifp->prefered_lft - regen_advance) { 4362 struct inet6_ifaddr *ifpub = ifp->ifpub; 4363 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4364 next = ifp->tstamp + ifp->prefered_lft * HZ; 4365 if (!ifp->regen_count && ifpub) { 4366 ifp->regen_count++; 4367 in6_ifa_hold(ifp); 4368 in6_ifa_hold(ifpub); 4369 spin_unlock(&ifp->lock); 4370 4371 spin_lock(&ifpub->lock); 4372 ifpub->regen_count = 0; 4373 spin_unlock(&ifpub->lock); 4374 ipv6_create_tempaddr(ifpub, ifp); 4375 in6_ifa_put(ifpub); 4376 in6_ifa_put(ifp); 4377 goto restart; 4378 } 4379 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4380 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4381 spin_unlock(&ifp->lock); 4382 } else { 4383 /* ifp->prefered_lft <= ifp->valid_lft */ 4384 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4385 next = ifp->tstamp + ifp->prefered_lft * HZ; 4386 spin_unlock(&ifp->lock); 4387 } 4388 } 4389 } 4390 4391 next_sec = round_jiffies_up(next); 4392 next_sched = next; 4393 4394 /* If rounded timeout is accurate enough, accept it. */ 4395 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4396 next_sched = next_sec; 4397 4398 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4399 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4400 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4401 4402 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4403 now, next, next_sec, next_sched); 4404 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4405 rcu_read_unlock_bh(); 4406 } 4407 4408 static void addrconf_verify_work(struct work_struct *w) 4409 { 4410 rtnl_lock(); 4411 addrconf_verify_rtnl(); 4412 rtnl_unlock(); 4413 } 4414 4415 static void addrconf_verify(void) 4416 { 4417 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4418 } 4419 4420 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4421 struct in6_addr **peer_pfx) 4422 { 4423 struct in6_addr *pfx = NULL; 4424 4425 *peer_pfx = NULL; 4426 4427 if (addr) 4428 pfx = nla_data(addr); 4429 4430 if (local) { 4431 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4432 *peer_pfx = pfx; 4433 pfx = nla_data(local); 4434 } 4435 4436 return pfx; 4437 } 4438 4439 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4440 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4441 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4442 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4443 [IFA_FLAGS] = { .len = sizeof(u32) }, 4444 }; 4445 4446 static int 4447 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4448 struct netlink_ext_ack *extack) 4449 { 4450 struct net *net = sock_net(skb->sk); 4451 struct ifaddrmsg *ifm; 4452 struct nlattr *tb[IFA_MAX+1]; 4453 struct in6_addr *pfx, *peer_pfx; 4454 u32 ifa_flags; 4455 int err; 4456 4457 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4458 extack); 4459 if (err < 0) 4460 return err; 4461 4462 ifm = nlmsg_data(nlh); 4463 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4464 if (!pfx) 4465 return -EINVAL; 4466 4467 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4468 4469 /* We ignore other flags so far. */ 4470 ifa_flags &= IFA_F_MANAGETEMPADDR; 4471 4472 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4473 ifm->ifa_prefixlen); 4474 } 4475 4476 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4477 u32 prefered_lft, u32 valid_lft) 4478 { 4479 u32 flags; 4480 clock_t expires; 4481 unsigned long timeout; 4482 bool was_managetempaddr; 4483 bool had_prefixroute; 4484 4485 ASSERT_RTNL(); 4486 4487 if (!valid_lft || (prefered_lft > valid_lft)) 4488 return -EINVAL; 4489 4490 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4491 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4492 return -EINVAL; 4493 4494 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4495 if (addrconf_finite_timeout(timeout)) { 4496 expires = jiffies_to_clock_t(timeout * HZ); 4497 valid_lft = timeout; 4498 flags = RTF_EXPIRES; 4499 } else { 4500 expires = 0; 4501 flags = 0; 4502 ifa_flags |= IFA_F_PERMANENT; 4503 } 4504 4505 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4506 if (addrconf_finite_timeout(timeout)) { 4507 if (timeout == 0) 4508 ifa_flags |= IFA_F_DEPRECATED; 4509 prefered_lft = timeout; 4510 } 4511 4512 spin_lock_bh(&ifp->lock); 4513 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4514 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4515 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4516 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4517 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4518 IFA_F_NOPREFIXROUTE); 4519 ifp->flags |= ifa_flags; 4520 ifp->tstamp = jiffies; 4521 ifp->valid_lft = valid_lft; 4522 ifp->prefered_lft = prefered_lft; 4523 4524 spin_unlock_bh(&ifp->lock); 4525 if (!(ifp->flags&IFA_F_TENTATIVE)) 4526 ipv6_ifa_notify(0, ifp); 4527 4528 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4529 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4530 expires, flags); 4531 } else if (had_prefixroute) { 4532 enum cleanup_prefix_rt_t action; 4533 unsigned long rt_expires; 4534 4535 write_lock_bh(&ifp->idev->lock); 4536 action = check_cleanup_prefix_route(ifp, &rt_expires); 4537 write_unlock_bh(&ifp->idev->lock); 4538 4539 if (action != CLEANUP_PREFIX_RT_NOP) { 4540 cleanup_prefix_route(ifp, rt_expires, 4541 action == CLEANUP_PREFIX_RT_DEL); 4542 } 4543 } 4544 4545 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4546 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4547 valid_lft = prefered_lft = 0; 4548 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4549 !was_managetempaddr, jiffies); 4550 } 4551 4552 addrconf_verify_rtnl(); 4553 4554 return 0; 4555 } 4556 4557 static int 4558 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4559 struct netlink_ext_ack *extack) 4560 { 4561 struct net *net = sock_net(skb->sk); 4562 struct ifaddrmsg *ifm; 4563 struct nlattr *tb[IFA_MAX+1]; 4564 struct in6_addr *pfx, *peer_pfx; 4565 struct inet6_ifaddr *ifa; 4566 struct net_device *dev; 4567 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4568 u32 ifa_flags; 4569 int err; 4570 4571 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4572 extack); 4573 if (err < 0) 4574 return err; 4575 4576 ifm = nlmsg_data(nlh); 4577 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4578 if (!pfx) 4579 return -EINVAL; 4580 4581 if (tb[IFA_CACHEINFO]) { 4582 struct ifa_cacheinfo *ci; 4583 4584 ci = nla_data(tb[IFA_CACHEINFO]); 4585 valid_lft = ci->ifa_valid; 4586 preferred_lft = ci->ifa_prefered; 4587 } else { 4588 preferred_lft = INFINITY_LIFE_TIME; 4589 valid_lft = INFINITY_LIFE_TIME; 4590 } 4591 4592 dev = __dev_get_by_index(net, ifm->ifa_index); 4593 if (!dev) 4594 return -ENODEV; 4595 4596 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4597 4598 /* We ignore other flags so far. */ 4599 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4600 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4601 4602 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4603 if (!ifa) { 4604 /* 4605 * It would be best to check for !NLM_F_CREATE here but 4606 * userspace already relies on not having to provide this. 4607 */ 4608 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4609 ifm->ifa_prefixlen, ifa_flags, 4610 preferred_lft, valid_lft); 4611 } 4612 4613 if (nlh->nlmsg_flags & NLM_F_EXCL || 4614 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4615 err = -EEXIST; 4616 else 4617 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4618 4619 in6_ifa_put(ifa); 4620 4621 return err; 4622 } 4623 4624 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4625 u8 scope, int ifindex) 4626 { 4627 struct ifaddrmsg *ifm; 4628 4629 ifm = nlmsg_data(nlh); 4630 ifm->ifa_family = AF_INET6; 4631 ifm->ifa_prefixlen = prefixlen; 4632 ifm->ifa_flags = flags; 4633 ifm->ifa_scope = scope; 4634 ifm->ifa_index = ifindex; 4635 } 4636 4637 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4638 unsigned long tstamp, u32 preferred, u32 valid) 4639 { 4640 struct ifa_cacheinfo ci; 4641 4642 ci.cstamp = cstamp_delta(cstamp); 4643 ci.tstamp = cstamp_delta(tstamp); 4644 ci.ifa_prefered = preferred; 4645 ci.ifa_valid = valid; 4646 4647 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4648 } 4649 4650 static inline int rt_scope(int ifa_scope) 4651 { 4652 if (ifa_scope & IFA_HOST) 4653 return RT_SCOPE_HOST; 4654 else if (ifa_scope & IFA_LINK) 4655 return RT_SCOPE_LINK; 4656 else if (ifa_scope & IFA_SITE) 4657 return RT_SCOPE_SITE; 4658 else 4659 return RT_SCOPE_UNIVERSE; 4660 } 4661 4662 static inline int inet6_ifaddr_msgsize(void) 4663 { 4664 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4665 + nla_total_size(16) /* IFA_LOCAL */ 4666 + nla_total_size(16) /* IFA_ADDRESS */ 4667 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4668 + nla_total_size(4) /* IFA_FLAGS */; 4669 } 4670 4671 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4672 u32 portid, u32 seq, int event, unsigned int flags) 4673 { 4674 struct nlmsghdr *nlh; 4675 u32 preferred, valid; 4676 4677 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4678 if (!nlh) 4679 return -EMSGSIZE; 4680 4681 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4682 ifa->idev->dev->ifindex); 4683 4684 if (!((ifa->flags&IFA_F_PERMANENT) && 4685 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4686 preferred = ifa->prefered_lft; 4687 valid = ifa->valid_lft; 4688 if (preferred != INFINITY_LIFE_TIME) { 4689 long tval = (jiffies - ifa->tstamp)/HZ; 4690 if (preferred > tval) 4691 preferred -= tval; 4692 else 4693 preferred = 0; 4694 if (valid != INFINITY_LIFE_TIME) { 4695 if (valid > tval) 4696 valid -= tval; 4697 else 4698 valid = 0; 4699 } 4700 } 4701 } else { 4702 preferred = INFINITY_LIFE_TIME; 4703 valid = INFINITY_LIFE_TIME; 4704 } 4705 4706 if (!ipv6_addr_any(&ifa->peer_addr)) { 4707 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4708 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4709 goto error; 4710 } else 4711 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4712 goto error; 4713 4714 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4715 goto error; 4716 4717 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4718 goto error; 4719 4720 nlmsg_end(skb, nlh); 4721 return 0; 4722 4723 error: 4724 nlmsg_cancel(skb, nlh); 4725 return -EMSGSIZE; 4726 } 4727 4728 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4729 u32 portid, u32 seq, int event, u16 flags) 4730 { 4731 struct nlmsghdr *nlh; 4732 u8 scope = RT_SCOPE_UNIVERSE; 4733 int ifindex = ifmca->idev->dev->ifindex; 4734 4735 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4736 scope = RT_SCOPE_SITE; 4737 4738 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4739 if (!nlh) 4740 return -EMSGSIZE; 4741 4742 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4743 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4744 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4745 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4746 nlmsg_cancel(skb, nlh); 4747 return -EMSGSIZE; 4748 } 4749 4750 nlmsg_end(skb, nlh); 4751 return 0; 4752 } 4753 4754 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4755 u32 portid, u32 seq, int event, unsigned int flags) 4756 { 4757 struct nlmsghdr *nlh; 4758 u8 scope = RT_SCOPE_UNIVERSE; 4759 int ifindex = ifaca->aca_idev->dev->ifindex; 4760 4761 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4762 scope = RT_SCOPE_SITE; 4763 4764 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4765 if (!nlh) 4766 return -EMSGSIZE; 4767 4768 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4769 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4770 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4771 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4772 nlmsg_cancel(skb, nlh); 4773 return -EMSGSIZE; 4774 } 4775 4776 nlmsg_end(skb, nlh); 4777 return 0; 4778 } 4779 4780 enum addr_type_t { 4781 UNICAST_ADDR, 4782 MULTICAST_ADDR, 4783 ANYCAST_ADDR, 4784 }; 4785 4786 /* called with rcu_read_lock() */ 4787 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4788 struct netlink_callback *cb, enum addr_type_t type, 4789 int s_ip_idx, int *p_ip_idx) 4790 { 4791 struct ifmcaddr6 *ifmca; 4792 struct ifacaddr6 *ifaca; 4793 int err = 1; 4794 int ip_idx = *p_ip_idx; 4795 4796 read_lock_bh(&idev->lock); 4797 switch (type) { 4798 case UNICAST_ADDR: { 4799 struct inet6_ifaddr *ifa; 4800 4801 /* unicast address incl. temp addr */ 4802 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4803 if (++ip_idx < s_ip_idx) 4804 continue; 4805 err = inet6_fill_ifaddr(skb, ifa, 4806 NETLINK_CB(cb->skb).portid, 4807 cb->nlh->nlmsg_seq, 4808 RTM_NEWADDR, 4809 NLM_F_MULTI); 4810 if (err < 0) 4811 break; 4812 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4813 } 4814 break; 4815 } 4816 case MULTICAST_ADDR: 4817 /* multicast address */ 4818 for (ifmca = idev->mc_list; ifmca; 4819 ifmca = ifmca->next, ip_idx++) { 4820 if (ip_idx < s_ip_idx) 4821 continue; 4822 err = inet6_fill_ifmcaddr(skb, ifmca, 4823 NETLINK_CB(cb->skb).portid, 4824 cb->nlh->nlmsg_seq, 4825 RTM_GETMULTICAST, 4826 NLM_F_MULTI); 4827 if (err < 0) 4828 break; 4829 } 4830 break; 4831 case ANYCAST_ADDR: 4832 /* anycast address */ 4833 for (ifaca = idev->ac_list; ifaca; 4834 ifaca = ifaca->aca_next, ip_idx++) { 4835 if (ip_idx < s_ip_idx) 4836 continue; 4837 err = inet6_fill_ifacaddr(skb, ifaca, 4838 NETLINK_CB(cb->skb).portid, 4839 cb->nlh->nlmsg_seq, 4840 RTM_GETANYCAST, 4841 NLM_F_MULTI); 4842 if (err < 0) 4843 break; 4844 } 4845 break; 4846 default: 4847 break; 4848 } 4849 read_unlock_bh(&idev->lock); 4850 *p_ip_idx = ip_idx; 4851 return err; 4852 } 4853 4854 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4855 enum addr_type_t type) 4856 { 4857 struct net *net = sock_net(skb->sk); 4858 int h, s_h; 4859 int idx, ip_idx; 4860 int s_idx, s_ip_idx; 4861 struct net_device *dev; 4862 struct inet6_dev *idev; 4863 struct hlist_head *head; 4864 4865 s_h = cb->args[0]; 4866 s_idx = idx = cb->args[1]; 4867 s_ip_idx = ip_idx = cb->args[2]; 4868 4869 rcu_read_lock(); 4870 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4871 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4872 idx = 0; 4873 head = &net->dev_index_head[h]; 4874 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4875 if (idx < s_idx) 4876 goto cont; 4877 if (h > s_h || idx > s_idx) 4878 s_ip_idx = 0; 4879 ip_idx = 0; 4880 idev = __in6_dev_get(dev); 4881 if (!idev) 4882 goto cont; 4883 4884 if (in6_dump_addrs(idev, skb, cb, type, 4885 s_ip_idx, &ip_idx) < 0) 4886 goto done; 4887 cont: 4888 idx++; 4889 } 4890 } 4891 done: 4892 rcu_read_unlock(); 4893 cb->args[0] = h; 4894 cb->args[1] = idx; 4895 cb->args[2] = ip_idx; 4896 4897 return skb->len; 4898 } 4899 4900 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4901 { 4902 enum addr_type_t type = UNICAST_ADDR; 4903 4904 return inet6_dump_addr(skb, cb, type); 4905 } 4906 4907 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4908 { 4909 enum addr_type_t type = MULTICAST_ADDR; 4910 4911 return inet6_dump_addr(skb, cb, type); 4912 } 4913 4914 4915 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4916 { 4917 enum addr_type_t type = ANYCAST_ADDR; 4918 4919 return inet6_dump_addr(skb, cb, type); 4920 } 4921 4922 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4923 struct netlink_ext_ack *extack) 4924 { 4925 struct net *net = sock_net(in_skb->sk); 4926 struct ifaddrmsg *ifm; 4927 struct nlattr *tb[IFA_MAX+1]; 4928 struct in6_addr *addr = NULL, *peer; 4929 struct net_device *dev = NULL; 4930 struct inet6_ifaddr *ifa; 4931 struct sk_buff *skb; 4932 int err; 4933 4934 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4935 extack); 4936 if (err < 0) 4937 goto errout; 4938 4939 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4940 if (!addr) { 4941 err = -EINVAL; 4942 goto errout; 4943 } 4944 4945 ifm = nlmsg_data(nlh); 4946 if (ifm->ifa_index) 4947 dev = __dev_get_by_index(net, ifm->ifa_index); 4948 4949 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4950 if (!ifa) { 4951 err = -EADDRNOTAVAIL; 4952 goto errout; 4953 } 4954 4955 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4956 if (!skb) { 4957 err = -ENOBUFS; 4958 goto errout_ifa; 4959 } 4960 4961 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4962 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4963 if (err < 0) { 4964 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4965 WARN_ON(err == -EMSGSIZE); 4966 kfree_skb(skb); 4967 goto errout_ifa; 4968 } 4969 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4970 errout_ifa: 4971 in6_ifa_put(ifa); 4972 errout: 4973 return err; 4974 } 4975 4976 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4977 { 4978 struct sk_buff *skb; 4979 struct net *net = dev_net(ifa->idev->dev); 4980 int err = -ENOBUFS; 4981 4982 /* Don't send DELADDR notification for TENTATIVE address, 4983 * since NEWADDR notification is sent only after removing 4984 * TENTATIVE flag. 4985 */ 4986 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4987 return; 4988 4989 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4990 if (!skb) 4991 goto errout; 4992 4993 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4994 if (err < 0) { 4995 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4996 WARN_ON(err == -EMSGSIZE); 4997 kfree_skb(skb); 4998 goto errout; 4999 } 5000 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5001 return; 5002 errout: 5003 if (err < 0) 5004 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5005 } 5006 5007 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5008 __s32 *array, int bytes) 5009 { 5010 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5011 5012 memset(array, 0, bytes); 5013 array[DEVCONF_FORWARDING] = cnf->forwarding; 5014 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5015 array[DEVCONF_MTU6] = cnf->mtu6; 5016 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5017 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5018 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5019 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5020 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5021 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5022 jiffies_to_msecs(cnf->rtr_solicit_interval); 5023 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5024 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5025 array[DEVCONF_RTR_SOLICIT_DELAY] = 5026 jiffies_to_msecs(cnf->rtr_solicit_delay); 5027 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5028 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5029 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5030 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5031 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5032 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5033 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5034 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5035 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5036 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5037 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5038 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5039 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5040 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5041 #ifdef CONFIG_IPV6_ROUTER_PREF 5042 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5043 array[DEVCONF_RTR_PROBE_INTERVAL] = 5044 jiffies_to_msecs(cnf->rtr_probe_interval); 5045 #ifdef CONFIG_IPV6_ROUTE_INFO 5046 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5047 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5048 #endif 5049 #endif 5050 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5051 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5052 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5053 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5054 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5055 #endif 5056 #ifdef CONFIG_IPV6_MROUTE 5057 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5058 #endif 5059 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5060 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5061 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5062 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5063 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5064 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5065 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5066 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5067 /* we omit DEVCONF_STABLE_SECRET for now */ 5068 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5069 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5070 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5071 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5072 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5073 #ifdef CONFIG_IPV6_SEG6_HMAC 5074 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5075 #endif 5076 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5077 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5078 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5079 } 5080 5081 static inline size_t inet6_ifla6_size(void) 5082 { 5083 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5084 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5085 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5086 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5087 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5088 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5089 } 5090 5091 static inline size_t inet6_if_nlmsg_size(void) 5092 { 5093 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5094 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5095 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5096 + nla_total_size(4) /* IFLA_MTU */ 5097 + nla_total_size(4) /* IFLA_LINK */ 5098 + nla_total_size(1) /* IFLA_OPERSTATE */ 5099 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5100 } 5101 5102 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5103 int bytes) 5104 { 5105 int i; 5106 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5107 BUG_ON(pad < 0); 5108 5109 /* Use put_unaligned() because stats may not be aligned for u64. */ 5110 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5111 for (i = 1; i < ICMP6_MIB_MAX; i++) 5112 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5113 5114 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5115 } 5116 5117 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5118 int bytes, size_t syncpoff) 5119 { 5120 int i, c; 5121 u64 buff[IPSTATS_MIB_MAX]; 5122 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5123 5124 BUG_ON(pad < 0); 5125 5126 memset(buff, 0, sizeof(buff)); 5127 buff[0] = IPSTATS_MIB_MAX; 5128 5129 for_each_possible_cpu(c) { 5130 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5131 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5132 } 5133 5134 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5135 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5136 } 5137 5138 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5139 int bytes) 5140 { 5141 switch (attrtype) { 5142 case IFLA_INET6_STATS: 5143 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5144 offsetof(struct ipstats_mib, syncp)); 5145 break; 5146 case IFLA_INET6_ICMP6STATS: 5147 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5148 break; 5149 } 5150 } 5151 5152 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5153 u32 ext_filter_mask) 5154 { 5155 struct nlattr *nla; 5156 struct ifla_cacheinfo ci; 5157 5158 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5159 goto nla_put_failure; 5160 ci.max_reasm_len = IPV6_MAXPLEN; 5161 ci.tstamp = cstamp_delta(idev->tstamp); 5162 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5163 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5164 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5165 goto nla_put_failure; 5166 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5167 if (!nla) 5168 goto nla_put_failure; 5169 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5170 5171 /* XXX - MC not implemented */ 5172 5173 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5174 return 0; 5175 5176 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5177 if (!nla) 5178 goto nla_put_failure; 5179 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5180 5181 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5182 if (!nla) 5183 goto nla_put_failure; 5184 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5185 5186 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5187 if (!nla) 5188 goto nla_put_failure; 5189 5190 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5191 goto nla_put_failure; 5192 5193 read_lock_bh(&idev->lock); 5194 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5195 read_unlock_bh(&idev->lock); 5196 5197 return 0; 5198 5199 nla_put_failure: 5200 return -EMSGSIZE; 5201 } 5202 5203 static size_t inet6_get_link_af_size(const struct net_device *dev, 5204 u32 ext_filter_mask) 5205 { 5206 if (!__in6_dev_get(dev)) 5207 return 0; 5208 5209 return inet6_ifla6_size(); 5210 } 5211 5212 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5213 u32 ext_filter_mask) 5214 { 5215 struct inet6_dev *idev = __in6_dev_get(dev); 5216 5217 if (!idev) 5218 return -ENODATA; 5219 5220 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5221 return -EMSGSIZE; 5222 5223 return 0; 5224 } 5225 5226 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5227 { 5228 struct inet6_ifaddr *ifp; 5229 struct net_device *dev = idev->dev; 5230 bool clear_token, update_rs = false; 5231 struct in6_addr ll_addr; 5232 5233 ASSERT_RTNL(); 5234 5235 if (!token) 5236 return -EINVAL; 5237 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5238 return -EINVAL; 5239 if (!ipv6_accept_ra(idev)) 5240 return -EINVAL; 5241 if (idev->cnf.rtr_solicits == 0) 5242 return -EINVAL; 5243 5244 write_lock_bh(&idev->lock); 5245 5246 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5247 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5248 5249 write_unlock_bh(&idev->lock); 5250 5251 clear_token = ipv6_addr_any(token); 5252 if (clear_token) 5253 goto update_lft; 5254 5255 if (!idev->dead && (idev->if_flags & IF_READY) && 5256 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5257 IFA_F_OPTIMISTIC)) { 5258 /* If we're not ready, then normal ifup will take care 5259 * of this. Otherwise, we need to request our rs here. 5260 */ 5261 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5262 update_rs = true; 5263 } 5264 5265 update_lft: 5266 write_lock_bh(&idev->lock); 5267 5268 if (update_rs) { 5269 idev->if_flags |= IF_RS_SENT; 5270 idev->rs_interval = rfc3315_s14_backoff_init( 5271 idev->cnf.rtr_solicit_interval); 5272 idev->rs_probes = 1; 5273 addrconf_mod_rs_timer(idev, idev->rs_interval); 5274 } 5275 5276 /* Well, that's kinda nasty ... */ 5277 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5278 spin_lock(&ifp->lock); 5279 if (ifp->tokenized) { 5280 ifp->valid_lft = 0; 5281 ifp->prefered_lft = 0; 5282 } 5283 spin_unlock(&ifp->lock); 5284 } 5285 5286 write_unlock_bh(&idev->lock); 5287 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5288 addrconf_verify_rtnl(); 5289 return 0; 5290 } 5291 5292 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5293 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5294 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5295 }; 5296 5297 static int inet6_validate_link_af(const struct net_device *dev, 5298 const struct nlattr *nla) 5299 { 5300 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5301 5302 if (dev && !__in6_dev_get(dev)) 5303 return -EAFNOSUPPORT; 5304 5305 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5306 NULL); 5307 } 5308 5309 static int check_addr_gen_mode(int mode) 5310 { 5311 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5312 mode != IN6_ADDR_GEN_MODE_NONE && 5313 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5314 mode != IN6_ADDR_GEN_MODE_RANDOM) 5315 return -EINVAL; 5316 return 1; 5317 } 5318 5319 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5320 int mode) 5321 { 5322 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5323 !idev->cnf.stable_secret.initialized && 5324 !net->ipv6.devconf_dflt->stable_secret.initialized) 5325 return -EINVAL; 5326 return 1; 5327 } 5328 5329 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5330 { 5331 int err = -EINVAL; 5332 struct inet6_dev *idev = __in6_dev_get(dev); 5333 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5334 5335 if (!idev) 5336 return -EAFNOSUPPORT; 5337 5338 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5339 BUG(); 5340 5341 if (tb[IFLA_INET6_TOKEN]) { 5342 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5343 if (err) 5344 return err; 5345 } 5346 5347 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5348 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5349 5350 if (check_addr_gen_mode(mode) < 0 || 5351 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5352 return -EINVAL; 5353 5354 idev->cnf.addr_gen_mode = mode; 5355 err = 0; 5356 } 5357 5358 return err; 5359 } 5360 5361 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5362 u32 portid, u32 seq, int event, unsigned int flags) 5363 { 5364 struct net_device *dev = idev->dev; 5365 struct ifinfomsg *hdr; 5366 struct nlmsghdr *nlh; 5367 void *protoinfo; 5368 5369 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5370 if (!nlh) 5371 return -EMSGSIZE; 5372 5373 hdr = nlmsg_data(nlh); 5374 hdr->ifi_family = AF_INET6; 5375 hdr->__ifi_pad = 0; 5376 hdr->ifi_type = dev->type; 5377 hdr->ifi_index = dev->ifindex; 5378 hdr->ifi_flags = dev_get_flags(dev); 5379 hdr->ifi_change = 0; 5380 5381 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5382 (dev->addr_len && 5383 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5384 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5385 (dev->ifindex != dev_get_iflink(dev) && 5386 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5387 nla_put_u8(skb, IFLA_OPERSTATE, 5388 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5389 goto nla_put_failure; 5390 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5391 if (!protoinfo) 5392 goto nla_put_failure; 5393 5394 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5395 goto nla_put_failure; 5396 5397 nla_nest_end(skb, protoinfo); 5398 nlmsg_end(skb, nlh); 5399 return 0; 5400 5401 nla_put_failure: 5402 nlmsg_cancel(skb, nlh); 5403 return -EMSGSIZE; 5404 } 5405 5406 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5407 { 5408 struct net *net = sock_net(skb->sk); 5409 int h, s_h; 5410 int idx = 0, s_idx; 5411 struct net_device *dev; 5412 struct inet6_dev *idev; 5413 struct hlist_head *head; 5414 5415 s_h = cb->args[0]; 5416 s_idx = cb->args[1]; 5417 5418 rcu_read_lock(); 5419 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5420 idx = 0; 5421 head = &net->dev_index_head[h]; 5422 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5423 if (idx < s_idx) 5424 goto cont; 5425 idev = __in6_dev_get(dev); 5426 if (!idev) 5427 goto cont; 5428 if (inet6_fill_ifinfo(skb, idev, 5429 NETLINK_CB(cb->skb).portid, 5430 cb->nlh->nlmsg_seq, 5431 RTM_NEWLINK, NLM_F_MULTI) < 0) 5432 goto out; 5433 cont: 5434 idx++; 5435 } 5436 } 5437 out: 5438 rcu_read_unlock(); 5439 cb->args[1] = idx; 5440 cb->args[0] = h; 5441 5442 return skb->len; 5443 } 5444 5445 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5446 { 5447 struct sk_buff *skb; 5448 struct net *net = dev_net(idev->dev); 5449 int err = -ENOBUFS; 5450 5451 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5452 if (!skb) 5453 goto errout; 5454 5455 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5456 if (err < 0) { 5457 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5458 WARN_ON(err == -EMSGSIZE); 5459 kfree_skb(skb); 5460 goto errout; 5461 } 5462 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5463 return; 5464 errout: 5465 if (err < 0) 5466 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5467 } 5468 5469 static inline size_t inet6_prefix_nlmsg_size(void) 5470 { 5471 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5472 + nla_total_size(sizeof(struct in6_addr)) 5473 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5474 } 5475 5476 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5477 struct prefix_info *pinfo, u32 portid, u32 seq, 5478 int event, unsigned int flags) 5479 { 5480 struct prefixmsg *pmsg; 5481 struct nlmsghdr *nlh; 5482 struct prefix_cacheinfo ci; 5483 5484 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5485 if (!nlh) 5486 return -EMSGSIZE; 5487 5488 pmsg = nlmsg_data(nlh); 5489 pmsg->prefix_family = AF_INET6; 5490 pmsg->prefix_pad1 = 0; 5491 pmsg->prefix_pad2 = 0; 5492 pmsg->prefix_ifindex = idev->dev->ifindex; 5493 pmsg->prefix_len = pinfo->prefix_len; 5494 pmsg->prefix_type = pinfo->type; 5495 pmsg->prefix_pad3 = 0; 5496 pmsg->prefix_flags = 0; 5497 if (pinfo->onlink) 5498 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5499 if (pinfo->autoconf) 5500 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5501 5502 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5503 goto nla_put_failure; 5504 ci.preferred_time = ntohl(pinfo->prefered); 5505 ci.valid_time = ntohl(pinfo->valid); 5506 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5507 goto nla_put_failure; 5508 nlmsg_end(skb, nlh); 5509 return 0; 5510 5511 nla_put_failure: 5512 nlmsg_cancel(skb, nlh); 5513 return -EMSGSIZE; 5514 } 5515 5516 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5517 struct prefix_info *pinfo) 5518 { 5519 struct sk_buff *skb; 5520 struct net *net = dev_net(idev->dev); 5521 int err = -ENOBUFS; 5522 5523 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5524 if (!skb) 5525 goto errout; 5526 5527 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5528 if (err < 0) { 5529 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5530 WARN_ON(err == -EMSGSIZE); 5531 kfree_skb(skb); 5532 goto errout; 5533 } 5534 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5535 return; 5536 errout: 5537 if (err < 0) 5538 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5539 } 5540 5541 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5542 { 5543 struct net *net = dev_net(ifp->idev->dev); 5544 5545 if (event) 5546 ASSERT_RTNL(); 5547 5548 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5549 5550 switch (event) { 5551 case RTM_NEWADDR: 5552 /* 5553 * If the address was optimistic 5554 * we inserted the route at the start of 5555 * our DAD process, so we don't need 5556 * to do it again 5557 */ 5558 if (!(ifp->rt->rt6i_node)) 5559 ip6_ins_rt(ifp->rt); 5560 if (ifp->idev->cnf.forwarding) 5561 addrconf_join_anycast(ifp); 5562 if (!ipv6_addr_any(&ifp->peer_addr)) 5563 addrconf_prefix_route(&ifp->peer_addr, 128, 5564 ifp->idev->dev, 0, 0); 5565 break; 5566 case RTM_DELADDR: 5567 if (ifp->idev->cnf.forwarding) 5568 addrconf_leave_anycast(ifp); 5569 addrconf_leave_solict(ifp->idev, &ifp->addr); 5570 if (!ipv6_addr_any(&ifp->peer_addr)) { 5571 struct rt6_info *rt; 5572 5573 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5574 ifp->idev->dev, 0, 0); 5575 if (rt) 5576 ip6_del_rt(rt); 5577 } 5578 if (ifp->rt) { 5579 if (dst_hold_safe(&ifp->rt->dst)) 5580 ip6_del_rt(ifp->rt); 5581 } 5582 rt_genid_bump_ipv6(net); 5583 break; 5584 } 5585 atomic_inc(&net->ipv6.dev_addr_genid); 5586 } 5587 5588 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5589 { 5590 rcu_read_lock_bh(); 5591 if (likely(ifp->idev->dead == 0)) 5592 __ipv6_ifa_notify(event, ifp); 5593 rcu_read_unlock_bh(); 5594 } 5595 5596 #ifdef CONFIG_SYSCTL 5597 5598 static 5599 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5600 void __user *buffer, size_t *lenp, loff_t *ppos) 5601 { 5602 int *valp = ctl->data; 5603 int val = *valp; 5604 loff_t pos = *ppos; 5605 struct ctl_table lctl; 5606 int ret; 5607 5608 /* 5609 * ctl->data points to idev->cnf.forwarding, we should 5610 * not modify it until we get the rtnl lock. 5611 */ 5612 lctl = *ctl; 5613 lctl.data = &val; 5614 5615 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5616 5617 if (write) 5618 ret = addrconf_fixup_forwarding(ctl, valp, val); 5619 if (ret) 5620 *ppos = pos; 5621 return ret; 5622 } 5623 5624 static 5625 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5626 void __user *buffer, size_t *lenp, loff_t *ppos) 5627 { 5628 struct inet6_dev *idev = ctl->extra1; 5629 int min_mtu = IPV6_MIN_MTU; 5630 struct ctl_table lctl; 5631 5632 lctl = *ctl; 5633 lctl.extra1 = &min_mtu; 5634 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5635 5636 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5637 } 5638 5639 static void dev_disable_change(struct inet6_dev *idev) 5640 { 5641 struct netdev_notifier_info info; 5642 5643 if (!idev || !idev->dev) 5644 return; 5645 5646 netdev_notifier_info_init(&info, idev->dev); 5647 if (idev->cnf.disable_ipv6) 5648 addrconf_notify(NULL, NETDEV_DOWN, &info); 5649 else 5650 addrconf_notify(NULL, NETDEV_UP, &info); 5651 } 5652 5653 static void addrconf_disable_change(struct net *net, __s32 newf) 5654 { 5655 struct net_device *dev; 5656 struct inet6_dev *idev; 5657 5658 for_each_netdev(net, dev) { 5659 idev = __in6_dev_get(dev); 5660 if (idev) { 5661 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5662 idev->cnf.disable_ipv6 = newf; 5663 if (changed) 5664 dev_disable_change(idev); 5665 } 5666 } 5667 } 5668 5669 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5670 { 5671 struct net *net; 5672 int old; 5673 5674 if (!rtnl_trylock()) 5675 return restart_syscall(); 5676 5677 net = (struct net *)table->extra2; 5678 old = *p; 5679 *p = newf; 5680 5681 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5682 rtnl_unlock(); 5683 return 0; 5684 } 5685 5686 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5687 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5688 addrconf_disable_change(net, newf); 5689 } else if ((!newf) ^ (!old)) 5690 dev_disable_change((struct inet6_dev *)table->extra1); 5691 5692 rtnl_unlock(); 5693 return 0; 5694 } 5695 5696 static 5697 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5698 void __user *buffer, size_t *lenp, loff_t *ppos) 5699 { 5700 int *valp = ctl->data; 5701 int val = *valp; 5702 loff_t pos = *ppos; 5703 struct ctl_table lctl; 5704 int ret; 5705 5706 /* 5707 * ctl->data points to idev->cnf.disable_ipv6, we should 5708 * not modify it until we get the rtnl lock. 5709 */ 5710 lctl = *ctl; 5711 lctl.data = &val; 5712 5713 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5714 5715 if (write) 5716 ret = addrconf_disable_ipv6(ctl, valp, val); 5717 if (ret) 5718 *ppos = pos; 5719 return ret; 5720 } 5721 5722 static 5723 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5724 void __user *buffer, size_t *lenp, loff_t *ppos) 5725 { 5726 int *valp = ctl->data; 5727 int ret; 5728 int old, new; 5729 5730 old = *valp; 5731 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5732 new = *valp; 5733 5734 if (write && old != new) { 5735 struct net *net = ctl->extra2; 5736 5737 if (!rtnl_trylock()) 5738 return restart_syscall(); 5739 5740 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5741 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5742 NETCONFA_PROXY_NEIGH, 5743 NETCONFA_IFINDEX_DEFAULT, 5744 net->ipv6.devconf_dflt); 5745 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5746 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5747 NETCONFA_PROXY_NEIGH, 5748 NETCONFA_IFINDEX_ALL, 5749 net->ipv6.devconf_all); 5750 else { 5751 struct inet6_dev *idev = ctl->extra1; 5752 5753 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5754 NETCONFA_PROXY_NEIGH, 5755 idev->dev->ifindex, 5756 &idev->cnf); 5757 } 5758 rtnl_unlock(); 5759 } 5760 5761 return ret; 5762 } 5763 5764 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5765 void __user *buffer, size_t *lenp, 5766 loff_t *ppos) 5767 { 5768 int ret = 0; 5769 int new_val; 5770 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5771 struct net *net = (struct net *)ctl->extra2; 5772 5773 if (!rtnl_trylock()) 5774 return restart_syscall(); 5775 5776 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5777 5778 if (write) { 5779 new_val = *((int *)ctl->data); 5780 5781 if (check_addr_gen_mode(new_val) < 0) { 5782 ret = -EINVAL; 5783 goto out; 5784 } 5785 5786 /* request for default */ 5787 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5788 ipv6_devconf_dflt.addr_gen_mode = new_val; 5789 5790 /* request for individual net device */ 5791 } else { 5792 if (!idev) 5793 goto out; 5794 5795 if (check_stable_privacy(idev, net, new_val) < 0) { 5796 ret = -EINVAL; 5797 goto out; 5798 } 5799 5800 if (idev->cnf.addr_gen_mode != new_val) { 5801 idev->cnf.addr_gen_mode = new_val; 5802 addrconf_dev_config(idev->dev); 5803 } 5804 } 5805 } 5806 5807 out: 5808 rtnl_unlock(); 5809 5810 return ret; 5811 } 5812 5813 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5814 void __user *buffer, size_t *lenp, 5815 loff_t *ppos) 5816 { 5817 int err; 5818 struct in6_addr addr; 5819 char str[IPV6_MAX_STRLEN]; 5820 struct ctl_table lctl = *ctl; 5821 struct net *net = ctl->extra2; 5822 struct ipv6_stable_secret *secret = ctl->data; 5823 5824 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5825 return -EIO; 5826 5827 lctl.maxlen = IPV6_MAX_STRLEN; 5828 lctl.data = str; 5829 5830 if (!rtnl_trylock()) 5831 return restart_syscall(); 5832 5833 if (!write && !secret->initialized) { 5834 err = -EIO; 5835 goto out; 5836 } 5837 5838 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5839 if (err >= sizeof(str)) { 5840 err = -EIO; 5841 goto out; 5842 } 5843 5844 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5845 if (err || !write) 5846 goto out; 5847 5848 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5849 err = -EIO; 5850 goto out; 5851 } 5852 5853 secret->initialized = true; 5854 secret->secret = addr; 5855 5856 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5857 struct net_device *dev; 5858 5859 for_each_netdev(net, dev) { 5860 struct inet6_dev *idev = __in6_dev_get(dev); 5861 5862 if (idev) { 5863 idev->cnf.addr_gen_mode = 5864 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5865 } 5866 } 5867 } else { 5868 struct inet6_dev *idev = ctl->extra1; 5869 5870 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5871 } 5872 5873 out: 5874 rtnl_unlock(); 5875 5876 return err; 5877 } 5878 5879 static 5880 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5881 int write, 5882 void __user *buffer, 5883 size_t *lenp, 5884 loff_t *ppos) 5885 { 5886 int *valp = ctl->data; 5887 int val = *valp; 5888 loff_t pos = *ppos; 5889 struct ctl_table lctl; 5890 int ret; 5891 5892 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5893 * we should not modify it until we get the rtnl lock. 5894 */ 5895 lctl = *ctl; 5896 lctl.data = &val; 5897 5898 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5899 5900 if (write) 5901 ret = addrconf_fixup_linkdown(ctl, valp, val); 5902 if (ret) 5903 *ppos = pos; 5904 return ret; 5905 } 5906 5907 static 5908 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5909 { 5910 if (rt) { 5911 if (action) 5912 rt->dst.flags |= DST_NOPOLICY; 5913 else 5914 rt->dst.flags &= ~DST_NOPOLICY; 5915 } 5916 } 5917 5918 static 5919 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5920 { 5921 struct inet6_ifaddr *ifa; 5922 5923 read_lock_bh(&idev->lock); 5924 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5925 spin_lock(&ifa->lock); 5926 if (ifa->rt) { 5927 struct rt6_info *rt = ifa->rt; 5928 struct fib6_table *table = rt->rt6i_table; 5929 int cpu; 5930 5931 read_lock(&table->tb6_lock); 5932 addrconf_set_nopolicy(ifa->rt, val); 5933 if (rt->rt6i_pcpu) { 5934 for_each_possible_cpu(cpu) { 5935 struct rt6_info **rtp; 5936 5937 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5938 addrconf_set_nopolicy(*rtp, val); 5939 } 5940 } 5941 read_unlock(&table->tb6_lock); 5942 } 5943 spin_unlock(&ifa->lock); 5944 } 5945 read_unlock_bh(&idev->lock); 5946 } 5947 5948 static 5949 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5950 { 5951 struct inet6_dev *idev; 5952 struct net *net; 5953 5954 if (!rtnl_trylock()) 5955 return restart_syscall(); 5956 5957 *valp = val; 5958 5959 net = (struct net *)ctl->extra2; 5960 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5961 rtnl_unlock(); 5962 return 0; 5963 } 5964 5965 if (valp == &net->ipv6.devconf_all->disable_policy) { 5966 struct net_device *dev; 5967 5968 for_each_netdev(net, dev) { 5969 idev = __in6_dev_get(dev); 5970 if (idev) 5971 addrconf_disable_policy_idev(idev, val); 5972 } 5973 } else { 5974 idev = (struct inet6_dev *)ctl->extra1; 5975 addrconf_disable_policy_idev(idev, val); 5976 } 5977 5978 rtnl_unlock(); 5979 return 0; 5980 } 5981 5982 static 5983 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5984 void __user *buffer, size_t *lenp, 5985 loff_t *ppos) 5986 { 5987 int *valp = ctl->data; 5988 int val = *valp; 5989 loff_t pos = *ppos; 5990 struct ctl_table lctl; 5991 int ret; 5992 5993 lctl = *ctl; 5994 lctl.data = &val; 5995 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5996 5997 if (write && (*valp != val)) 5998 ret = addrconf_disable_policy(ctl, valp, val); 5999 6000 if (ret) 6001 *ppos = pos; 6002 6003 return ret; 6004 } 6005 6006 static int minus_one = -1; 6007 static const int one = 1; 6008 static const int two_five_five = 255; 6009 6010 static const struct ctl_table addrconf_sysctl[] = { 6011 { 6012 .procname = "forwarding", 6013 .data = &ipv6_devconf.forwarding, 6014 .maxlen = sizeof(int), 6015 .mode = 0644, 6016 .proc_handler = addrconf_sysctl_forward, 6017 }, 6018 { 6019 .procname = "hop_limit", 6020 .data = &ipv6_devconf.hop_limit, 6021 .maxlen = sizeof(int), 6022 .mode = 0644, 6023 .proc_handler = proc_dointvec_minmax, 6024 .extra1 = (void *)&one, 6025 .extra2 = (void *)&two_five_five, 6026 }, 6027 { 6028 .procname = "mtu", 6029 .data = &ipv6_devconf.mtu6, 6030 .maxlen = sizeof(int), 6031 .mode = 0644, 6032 .proc_handler = addrconf_sysctl_mtu, 6033 }, 6034 { 6035 .procname = "accept_ra", 6036 .data = &ipv6_devconf.accept_ra, 6037 .maxlen = sizeof(int), 6038 .mode = 0644, 6039 .proc_handler = proc_dointvec, 6040 }, 6041 { 6042 .procname = "accept_redirects", 6043 .data = &ipv6_devconf.accept_redirects, 6044 .maxlen = sizeof(int), 6045 .mode = 0644, 6046 .proc_handler = proc_dointvec, 6047 }, 6048 { 6049 .procname = "autoconf", 6050 .data = &ipv6_devconf.autoconf, 6051 .maxlen = sizeof(int), 6052 .mode = 0644, 6053 .proc_handler = proc_dointvec, 6054 }, 6055 { 6056 .procname = "dad_transmits", 6057 .data = &ipv6_devconf.dad_transmits, 6058 .maxlen = sizeof(int), 6059 .mode = 0644, 6060 .proc_handler = proc_dointvec, 6061 }, 6062 { 6063 .procname = "router_solicitations", 6064 .data = &ipv6_devconf.rtr_solicits, 6065 .maxlen = sizeof(int), 6066 .mode = 0644, 6067 .proc_handler = proc_dointvec_minmax, 6068 .extra1 = &minus_one, 6069 }, 6070 { 6071 .procname = "router_solicitation_interval", 6072 .data = &ipv6_devconf.rtr_solicit_interval, 6073 .maxlen = sizeof(int), 6074 .mode = 0644, 6075 .proc_handler = proc_dointvec_jiffies, 6076 }, 6077 { 6078 .procname = "router_solicitation_max_interval", 6079 .data = &ipv6_devconf.rtr_solicit_max_interval, 6080 .maxlen = sizeof(int), 6081 .mode = 0644, 6082 .proc_handler = proc_dointvec_jiffies, 6083 }, 6084 { 6085 .procname = "router_solicitation_delay", 6086 .data = &ipv6_devconf.rtr_solicit_delay, 6087 .maxlen = sizeof(int), 6088 .mode = 0644, 6089 .proc_handler = proc_dointvec_jiffies, 6090 }, 6091 { 6092 .procname = "force_mld_version", 6093 .data = &ipv6_devconf.force_mld_version, 6094 .maxlen = sizeof(int), 6095 .mode = 0644, 6096 .proc_handler = proc_dointvec, 6097 }, 6098 { 6099 .procname = "mldv1_unsolicited_report_interval", 6100 .data = 6101 &ipv6_devconf.mldv1_unsolicited_report_interval, 6102 .maxlen = sizeof(int), 6103 .mode = 0644, 6104 .proc_handler = proc_dointvec_ms_jiffies, 6105 }, 6106 { 6107 .procname = "mldv2_unsolicited_report_interval", 6108 .data = 6109 &ipv6_devconf.mldv2_unsolicited_report_interval, 6110 .maxlen = sizeof(int), 6111 .mode = 0644, 6112 .proc_handler = proc_dointvec_ms_jiffies, 6113 }, 6114 { 6115 .procname = "use_tempaddr", 6116 .data = &ipv6_devconf.use_tempaddr, 6117 .maxlen = sizeof(int), 6118 .mode = 0644, 6119 .proc_handler = proc_dointvec, 6120 }, 6121 { 6122 .procname = "temp_valid_lft", 6123 .data = &ipv6_devconf.temp_valid_lft, 6124 .maxlen = sizeof(int), 6125 .mode = 0644, 6126 .proc_handler = proc_dointvec, 6127 }, 6128 { 6129 .procname = "temp_prefered_lft", 6130 .data = &ipv6_devconf.temp_prefered_lft, 6131 .maxlen = sizeof(int), 6132 .mode = 0644, 6133 .proc_handler = proc_dointvec, 6134 }, 6135 { 6136 .procname = "regen_max_retry", 6137 .data = &ipv6_devconf.regen_max_retry, 6138 .maxlen = sizeof(int), 6139 .mode = 0644, 6140 .proc_handler = proc_dointvec, 6141 }, 6142 { 6143 .procname = "max_desync_factor", 6144 .data = &ipv6_devconf.max_desync_factor, 6145 .maxlen = sizeof(int), 6146 .mode = 0644, 6147 .proc_handler = proc_dointvec, 6148 }, 6149 { 6150 .procname = "max_addresses", 6151 .data = &ipv6_devconf.max_addresses, 6152 .maxlen = sizeof(int), 6153 .mode = 0644, 6154 .proc_handler = proc_dointvec, 6155 }, 6156 { 6157 .procname = "accept_ra_defrtr", 6158 .data = &ipv6_devconf.accept_ra_defrtr, 6159 .maxlen = sizeof(int), 6160 .mode = 0644, 6161 .proc_handler = proc_dointvec, 6162 }, 6163 { 6164 .procname = "accept_ra_min_hop_limit", 6165 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6166 .maxlen = sizeof(int), 6167 .mode = 0644, 6168 .proc_handler = proc_dointvec, 6169 }, 6170 { 6171 .procname = "accept_ra_pinfo", 6172 .data = &ipv6_devconf.accept_ra_pinfo, 6173 .maxlen = sizeof(int), 6174 .mode = 0644, 6175 .proc_handler = proc_dointvec, 6176 }, 6177 #ifdef CONFIG_IPV6_ROUTER_PREF 6178 { 6179 .procname = "accept_ra_rtr_pref", 6180 .data = &ipv6_devconf.accept_ra_rtr_pref, 6181 .maxlen = sizeof(int), 6182 .mode = 0644, 6183 .proc_handler = proc_dointvec, 6184 }, 6185 { 6186 .procname = "router_probe_interval", 6187 .data = &ipv6_devconf.rtr_probe_interval, 6188 .maxlen = sizeof(int), 6189 .mode = 0644, 6190 .proc_handler = proc_dointvec_jiffies, 6191 }, 6192 #ifdef CONFIG_IPV6_ROUTE_INFO 6193 { 6194 .procname = "accept_ra_rt_info_min_plen", 6195 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6196 .maxlen = sizeof(int), 6197 .mode = 0644, 6198 .proc_handler = proc_dointvec, 6199 }, 6200 { 6201 .procname = "accept_ra_rt_info_max_plen", 6202 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6203 .maxlen = sizeof(int), 6204 .mode = 0644, 6205 .proc_handler = proc_dointvec, 6206 }, 6207 #endif 6208 #endif 6209 { 6210 .procname = "proxy_ndp", 6211 .data = &ipv6_devconf.proxy_ndp, 6212 .maxlen = sizeof(int), 6213 .mode = 0644, 6214 .proc_handler = addrconf_sysctl_proxy_ndp, 6215 }, 6216 { 6217 .procname = "accept_source_route", 6218 .data = &ipv6_devconf.accept_source_route, 6219 .maxlen = sizeof(int), 6220 .mode = 0644, 6221 .proc_handler = proc_dointvec, 6222 }, 6223 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6224 { 6225 .procname = "optimistic_dad", 6226 .data = &ipv6_devconf.optimistic_dad, 6227 .maxlen = sizeof(int), 6228 .mode = 0644, 6229 .proc_handler = proc_dointvec, 6230 }, 6231 { 6232 .procname = "use_optimistic", 6233 .data = &ipv6_devconf.use_optimistic, 6234 .maxlen = sizeof(int), 6235 .mode = 0644, 6236 .proc_handler = proc_dointvec, 6237 }, 6238 #endif 6239 #ifdef CONFIG_IPV6_MROUTE 6240 { 6241 .procname = "mc_forwarding", 6242 .data = &ipv6_devconf.mc_forwarding, 6243 .maxlen = sizeof(int), 6244 .mode = 0444, 6245 .proc_handler = proc_dointvec, 6246 }, 6247 #endif 6248 { 6249 .procname = "disable_ipv6", 6250 .data = &ipv6_devconf.disable_ipv6, 6251 .maxlen = sizeof(int), 6252 .mode = 0644, 6253 .proc_handler = addrconf_sysctl_disable, 6254 }, 6255 { 6256 .procname = "accept_dad", 6257 .data = &ipv6_devconf.accept_dad, 6258 .maxlen = sizeof(int), 6259 .mode = 0644, 6260 .proc_handler = proc_dointvec, 6261 }, 6262 { 6263 .procname = "force_tllao", 6264 .data = &ipv6_devconf.force_tllao, 6265 .maxlen = sizeof(int), 6266 .mode = 0644, 6267 .proc_handler = proc_dointvec 6268 }, 6269 { 6270 .procname = "ndisc_notify", 6271 .data = &ipv6_devconf.ndisc_notify, 6272 .maxlen = sizeof(int), 6273 .mode = 0644, 6274 .proc_handler = proc_dointvec 6275 }, 6276 { 6277 .procname = "suppress_frag_ndisc", 6278 .data = &ipv6_devconf.suppress_frag_ndisc, 6279 .maxlen = sizeof(int), 6280 .mode = 0644, 6281 .proc_handler = proc_dointvec 6282 }, 6283 { 6284 .procname = "accept_ra_from_local", 6285 .data = &ipv6_devconf.accept_ra_from_local, 6286 .maxlen = sizeof(int), 6287 .mode = 0644, 6288 .proc_handler = proc_dointvec, 6289 }, 6290 { 6291 .procname = "accept_ra_mtu", 6292 .data = &ipv6_devconf.accept_ra_mtu, 6293 .maxlen = sizeof(int), 6294 .mode = 0644, 6295 .proc_handler = proc_dointvec, 6296 }, 6297 { 6298 .procname = "stable_secret", 6299 .data = &ipv6_devconf.stable_secret, 6300 .maxlen = IPV6_MAX_STRLEN, 6301 .mode = 0600, 6302 .proc_handler = addrconf_sysctl_stable_secret, 6303 }, 6304 { 6305 .procname = "use_oif_addrs_only", 6306 .data = &ipv6_devconf.use_oif_addrs_only, 6307 .maxlen = sizeof(int), 6308 .mode = 0644, 6309 .proc_handler = proc_dointvec, 6310 }, 6311 { 6312 .procname = "ignore_routes_with_linkdown", 6313 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6314 .maxlen = sizeof(int), 6315 .mode = 0644, 6316 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6317 }, 6318 { 6319 .procname = "drop_unicast_in_l2_multicast", 6320 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6321 .maxlen = sizeof(int), 6322 .mode = 0644, 6323 .proc_handler = proc_dointvec, 6324 }, 6325 { 6326 .procname = "drop_unsolicited_na", 6327 .data = &ipv6_devconf.drop_unsolicited_na, 6328 .maxlen = sizeof(int), 6329 .mode = 0644, 6330 .proc_handler = proc_dointvec, 6331 }, 6332 { 6333 .procname = "keep_addr_on_down", 6334 .data = &ipv6_devconf.keep_addr_on_down, 6335 .maxlen = sizeof(int), 6336 .mode = 0644, 6337 .proc_handler = proc_dointvec, 6338 6339 }, 6340 { 6341 .procname = "seg6_enabled", 6342 .data = &ipv6_devconf.seg6_enabled, 6343 .maxlen = sizeof(int), 6344 .mode = 0644, 6345 .proc_handler = proc_dointvec, 6346 }, 6347 #ifdef CONFIG_IPV6_SEG6_HMAC 6348 { 6349 .procname = "seg6_require_hmac", 6350 .data = &ipv6_devconf.seg6_require_hmac, 6351 .maxlen = sizeof(int), 6352 .mode = 0644, 6353 .proc_handler = proc_dointvec, 6354 }, 6355 #endif 6356 { 6357 .procname = "enhanced_dad", 6358 .data = &ipv6_devconf.enhanced_dad, 6359 .maxlen = sizeof(int), 6360 .mode = 0644, 6361 .proc_handler = proc_dointvec, 6362 }, 6363 { 6364 .procname = "addr_gen_mode", 6365 .data = &ipv6_devconf.addr_gen_mode, 6366 .maxlen = sizeof(int), 6367 .mode = 0644, 6368 .proc_handler = addrconf_sysctl_addr_gen_mode, 6369 }, 6370 { 6371 .procname = "disable_policy", 6372 .data = &ipv6_devconf.disable_policy, 6373 .maxlen = sizeof(int), 6374 .mode = 0644, 6375 .proc_handler = addrconf_sysctl_disable_policy, 6376 }, 6377 { 6378 /* sentinel */ 6379 } 6380 }; 6381 6382 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6383 struct inet6_dev *idev, struct ipv6_devconf *p) 6384 { 6385 int i, ifindex; 6386 struct ctl_table *table; 6387 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6388 6389 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6390 if (!table) 6391 goto out; 6392 6393 for (i = 0; table[i].data; i++) { 6394 table[i].data += (char *)p - (char *)&ipv6_devconf; 6395 /* If one of these is already set, then it is not safe to 6396 * overwrite either of them: this makes proc_dointvec_minmax 6397 * usable. 6398 */ 6399 if (!table[i].extra1 && !table[i].extra2) { 6400 table[i].extra1 = idev; /* embedded; no ref */ 6401 table[i].extra2 = net; 6402 } 6403 } 6404 6405 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6406 6407 p->sysctl_header = register_net_sysctl(net, path, table); 6408 if (!p->sysctl_header) 6409 goto free; 6410 6411 if (!strcmp(dev_name, "all")) 6412 ifindex = NETCONFA_IFINDEX_ALL; 6413 else if (!strcmp(dev_name, "default")) 6414 ifindex = NETCONFA_IFINDEX_DEFAULT; 6415 else 6416 ifindex = idev->dev->ifindex; 6417 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6418 ifindex, p); 6419 return 0; 6420 6421 free: 6422 kfree(table); 6423 out: 6424 return -ENOBUFS; 6425 } 6426 6427 static void __addrconf_sysctl_unregister(struct net *net, 6428 struct ipv6_devconf *p, int ifindex) 6429 { 6430 struct ctl_table *table; 6431 6432 if (!p->sysctl_header) 6433 return; 6434 6435 table = p->sysctl_header->ctl_table_arg; 6436 unregister_net_sysctl_table(p->sysctl_header); 6437 p->sysctl_header = NULL; 6438 kfree(table); 6439 6440 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6441 } 6442 6443 static int addrconf_sysctl_register(struct inet6_dev *idev) 6444 { 6445 int err; 6446 6447 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6448 return -EINVAL; 6449 6450 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6451 &ndisc_ifinfo_sysctl_change); 6452 if (err) 6453 return err; 6454 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6455 idev, &idev->cnf); 6456 if (err) 6457 neigh_sysctl_unregister(idev->nd_parms); 6458 6459 return err; 6460 } 6461 6462 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6463 { 6464 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6465 idev->dev->ifindex); 6466 neigh_sysctl_unregister(idev->nd_parms); 6467 } 6468 6469 6470 #endif 6471 6472 static int __net_init addrconf_init_net(struct net *net) 6473 { 6474 int err = -ENOMEM; 6475 struct ipv6_devconf *all, *dflt; 6476 6477 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6478 if (!all) 6479 goto err_alloc_all; 6480 6481 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6482 if (!dflt) 6483 goto err_alloc_dflt; 6484 6485 /* these will be inherited by all namespaces */ 6486 dflt->autoconf = ipv6_defaults.autoconf; 6487 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6488 6489 dflt->stable_secret.initialized = false; 6490 all->stable_secret.initialized = false; 6491 6492 net->ipv6.devconf_all = all; 6493 net->ipv6.devconf_dflt = dflt; 6494 6495 #ifdef CONFIG_SYSCTL 6496 err = __addrconf_sysctl_register(net, "all", NULL, all); 6497 if (err < 0) 6498 goto err_reg_all; 6499 6500 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6501 if (err < 0) 6502 goto err_reg_dflt; 6503 #endif 6504 return 0; 6505 6506 #ifdef CONFIG_SYSCTL 6507 err_reg_dflt: 6508 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6509 err_reg_all: 6510 kfree(dflt); 6511 #endif 6512 err_alloc_dflt: 6513 kfree(all); 6514 err_alloc_all: 6515 return err; 6516 } 6517 6518 static void __net_exit addrconf_exit_net(struct net *net) 6519 { 6520 #ifdef CONFIG_SYSCTL 6521 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6522 NETCONFA_IFINDEX_DEFAULT); 6523 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6524 NETCONFA_IFINDEX_ALL); 6525 #endif 6526 kfree(net->ipv6.devconf_dflt); 6527 kfree(net->ipv6.devconf_all); 6528 } 6529 6530 static struct pernet_operations addrconf_ops = { 6531 .init = addrconf_init_net, 6532 .exit = addrconf_exit_net, 6533 }; 6534 6535 static struct rtnl_af_ops inet6_ops __read_mostly = { 6536 .family = AF_INET6, 6537 .fill_link_af = inet6_fill_link_af, 6538 .get_link_af_size = inet6_get_link_af_size, 6539 .validate_link_af = inet6_validate_link_af, 6540 .set_link_af = inet6_set_link_af, 6541 }; 6542 6543 /* 6544 * Init / cleanup code 6545 */ 6546 6547 int __init addrconf_init(void) 6548 { 6549 struct inet6_dev *idev; 6550 int i, err; 6551 6552 err = ipv6_addr_label_init(); 6553 if (err < 0) { 6554 pr_crit("%s: cannot initialize default policy table: %d\n", 6555 __func__, err); 6556 goto out; 6557 } 6558 6559 err = register_pernet_subsys(&addrconf_ops); 6560 if (err < 0) 6561 goto out_addrlabel; 6562 6563 addrconf_wq = create_workqueue("ipv6_addrconf"); 6564 if (!addrconf_wq) { 6565 err = -ENOMEM; 6566 goto out_nowq; 6567 } 6568 6569 /* The addrconf netdev notifier requires that loopback_dev 6570 * has it's ipv6 private information allocated and setup 6571 * before it can bring up and give link-local addresses 6572 * to other devices which are up. 6573 * 6574 * Unfortunately, loopback_dev is not necessarily the first 6575 * entry in the global dev_base list of net devices. In fact, 6576 * it is likely to be the very last entry on that list. 6577 * So this causes the notifier registry below to try and 6578 * give link-local addresses to all devices besides loopback_dev 6579 * first, then loopback_dev, which cases all the non-loopback_dev 6580 * devices to fail to get a link-local address. 6581 * 6582 * So, as a temporary fix, allocate the ipv6 structure for 6583 * loopback_dev first by hand. 6584 * Longer term, all of the dependencies ipv6 has upon the loopback 6585 * device and it being up should be removed. 6586 */ 6587 rtnl_lock(); 6588 idev = ipv6_add_dev(init_net.loopback_dev); 6589 rtnl_unlock(); 6590 if (IS_ERR(idev)) { 6591 err = PTR_ERR(idev); 6592 goto errlo; 6593 } 6594 6595 ip6_route_init_special_entries(); 6596 6597 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6598 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6599 6600 register_netdevice_notifier(&ipv6_dev_notf); 6601 6602 addrconf_verify(); 6603 6604 rtnl_af_register(&inet6_ops); 6605 6606 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6607 NULL); 6608 if (err < 0) 6609 goto errout; 6610 6611 /* Only the first call to __rtnl_register can fail */ 6612 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6613 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6614 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6615 inet6_dump_ifaddr, NULL); 6616 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6617 inet6_dump_ifmcaddr, NULL); 6618 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6619 inet6_dump_ifacaddr, NULL); 6620 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6621 inet6_netconf_dump_devconf, NULL); 6622 6623 ipv6_addr_label_rtnl_register(); 6624 6625 return 0; 6626 errout: 6627 rtnl_af_unregister(&inet6_ops); 6628 unregister_netdevice_notifier(&ipv6_dev_notf); 6629 errlo: 6630 destroy_workqueue(addrconf_wq); 6631 out_nowq: 6632 unregister_pernet_subsys(&addrconf_ops); 6633 out_addrlabel: 6634 ipv6_addr_label_cleanup(); 6635 out: 6636 return err; 6637 } 6638 6639 void addrconf_cleanup(void) 6640 { 6641 struct net_device *dev; 6642 int i; 6643 6644 unregister_netdevice_notifier(&ipv6_dev_notf); 6645 unregister_pernet_subsys(&addrconf_ops); 6646 ipv6_addr_label_cleanup(); 6647 6648 rtnl_lock(); 6649 6650 __rtnl_af_unregister(&inet6_ops); 6651 6652 /* clean dev list */ 6653 for_each_netdev(&init_net, dev) { 6654 if (__in6_dev_get(dev) == NULL) 6655 continue; 6656 addrconf_ifdown(dev, 1); 6657 } 6658 addrconf_ifdown(init_net.loopback_dev, 2); 6659 6660 /* 6661 * Check hash table. 6662 */ 6663 spin_lock_bh(&addrconf_hash_lock); 6664 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6665 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6666 spin_unlock_bh(&addrconf_hash_lock); 6667 cancel_delayed_work(&addr_chk_work); 6668 rtnl_unlock(); 6669 6670 destroy_workqueue(addrconf_wq); 6671 } 6672