1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 /* 161 * Configured unicast address hash table 162 */ 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 164 static DEFINE_SPINLOCK(addrconf_hash_lock); 165 166 static void addrconf_verify(void); 167 static void addrconf_verify_rtnl(void); 168 static void addrconf_verify_work(struct work_struct *); 169 170 static struct workqueue_struct *addrconf_wq; 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 172 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 175 176 static void addrconf_type_change(struct net_device *dev, 177 unsigned long event); 178 static int addrconf_ifdown(struct net_device *dev, int how); 179 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 181 int plen, 182 const struct net_device *dev, 183 u32 flags, u32 noflags); 184 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 186 static void addrconf_dad_work(struct work_struct *w); 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 188 static void addrconf_dad_run(struct inet6_dev *idev); 189 static void addrconf_rs_timer(unsigned long data); 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 192 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 194 struct prefix_info *pinfo); 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 196 struct net_device *dev); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_min_plen = 0, 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 .accept_ra_mtu = 1, 237 .stable_secret = { 238 .initialized = false, 239 }, 240 .use_oif_addrs_only = 0, 241 .ignore_routes_with_linkdown = 0, 242 .keep_addr_on_down = 0, 243 .seg6_enabled = 0, 244 #ifdef CONFIG_IPV6_SEG6_HMAC 245 .seg6_require_hmac = 0, 246 #endif 247 .enhanced_dad = 1, 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 249 .disable_policy = 0, 250 }; 251 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 253 .forwarding = 0, 254 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 255 .mtu6 = IPV6_MIN_MTU, 256 .accept_ra = 1, 257 .accept_redirects = 1, 258 .autoconf = 1, 259 .force_mld_version = 0, 260 .mldv1_unsolicited_report_interval = 10 * HZ, 261 .mldv2_unsolicited_report_interval = HZ, 262 .dad_transmits = 1, 263 .rtr_solicits = MAX_RTR_SOLICITATIONS, 264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 267 .use_tempaddr = 0, 268 .temp_valid_lft = TEMP_VALID_LIFETIME, 269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 270 .regen_max_retry = REGEN_MAX_RETRY, 271 .max_desync_factor = MAX_DESYNC_FACTOR, 272 .max_addresses = IPV6_MAX_ADDRESSES, 273 .accept_ra_defrtr = 1, 274 .accept_ra_from_local = 0, 275 .accept_ra_min_hop_limit= 1, 276 .accept_ra_pinfo = 1, 277 #ifdef CONFIG_IPV6_ROUTER_PREF 278 .accept_ra_rtr_pref = 1, 279 .rtr_probe_interval = 60 * HZ, 280 #ifdef CONFIG_IPV6_ROUTE_INFO 281 .accept_ra_rt_info_min_plen = 0, 282 .accept_ra_rt_info_max_plen = 0, 283 #endif 284 #endif 285 .proxy_ndp = 0, 286 .accept_source_route = 0, /* we do not accept RH0 by default. */ 287 .disable_ipv6 = 0, 288 .accept_dad = 1, 289 .suppress_frag_ndisc = 1, 290 .accept_ra_mtu = 1, 291 .stable_secret = { 292 .initialized = false, 293 }, 294 .use_oif_addrs_only = 0, 295 .ignore_routes_with_linkdown = 0, 296 .keep_addr_on_down = 0, 297 .seg6_enabled = 0, 298 #ifdef CONFIG_IPV6_SEG6_HMAC 299 .seg6_require_hmac = 0, 300 #endif 301 .enhanced_dad = 1, 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 303 .disable_policy = 0, 304 }; 305 306 /* Check if a valid qdisc is available */ 307 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 308 { 309 return !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!timer_pending(&idev->rs_timer)) 328 in6_dev_hold(idev); 329 mod_timer(&idev->rs_timer, jiffies + when); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 if (!delayed_work_pending(&ifp->dad_work)) 336 in6_ifa_hold(ifp); 337 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 392 (unsigned long)ndev); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 else 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 399 400 ndev->cnf.mtu6 = dev->mtu; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 dev_hold(dev); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 ADBG(KERN_WARNING 413 "%s: cannot allocate memory for statistics; dev=%s.\n", 414 __func__, dev->name); 415 neigh_parms_release(&nd_tbl, ndev->nd_parms); 416 dev_put(dev); 417 kfree(ndev); 418 return ERR_PTR(err); 419 } 420 421 if (snmp6_register_dev(ndev) < 0) { 422 ADBG(KERN_WARNING 423 "%s: cannot create /proc/net/dev_snmp6/%s\n", 424 __func__, dev->name); 425 goto err_release; 426 } 427 428 /* One reference from device. */ 429 in6_dev_hold(ndev); 430 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 432 ndev->cnf.accept_dad = -1; 433 434 #if IS_ENABLED(CONFIG_IPV6_SIT) 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 436 pr_info("%s: Disabled Multicast RS\n", dev->name); 437 ndev->cnf.rtr_solicits = 0; 438 } 439 #endif 440 441 INIT_LIST_HEAD(&ndev->tempaddr_list); 442 ndev->desync_factor = U32_MAX; 443 if ((dev->flags&IFF_LOOPBACK) || 444 dev->type == ARPHRD_TUNNEL || 445 dev->type == ARPHRD_TUNNEL6 || 446 dev->type == ARPHRD_SIT || 447 dev->type == ARPHRD_NONE) { 448 ndev->cnf.use_tempaddr = -1; 449 } else 450 ipv6_regen_rndid(ndev); 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 455 ndev->if_flags |= IF_READY; 456 457 ipv6_mc_init_dev(ndev); 458 ndev->tstamp = jiffies; 459 err = addrconf_sysctl_register(ndev); 460 if (err) { 461 ipv6_mc_destroy_dev(ndev); 462 snmp6_unregister_dev(ndev); 463 goto err_release; 464 } 465 /* protected by rtnl_lock */ 466 rcu_assign_pointer(dev->ip6_ptr, ndev); 467 468 /* Join interface-local all-node multicast group */ 469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 470 471 /* Join all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 473 474 /* Join all-router multicast group if forwarding is set */ 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 478 return ndev; 479 480 err_release: 481 neigh_parms_release(&nd_tbl, ndev->nd_parms); 482 ndev->dead = 1; 483 in6_dev_finish_destroy(ndev); 484 return ERR_PTR(err); 485 } 486 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 488 { 489 struct inet6_dev *idev; 490 491 ASSERT_RTNL(); 492 493 idev = __in6_dev_get(dev); 494 if (!idev) { 495 idev = ipv6_add_dev(dev); 496 if (IS_ERR(idev)) 497 return NULL; 498 } 499 500 if (dev->flags&IFF_UP) 501 ipv6_mc_up(idev); 502 return idev; 503 } 504 505 static int inet6_netconf_msgsize_devconf(int type) 506 { 507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 508 + nla_total_size(4); /* NETCONFA_IFINDEX */ 509 bool all = false; 510 511 if (type == NETCONFA_ALL) 512 all = true; 513 514 if (all || type == NETCONFA_FORWARDING) 515 size += nla_total_size(4); 516 #ifdef CONFIG_IPV6_MROUTE 517 if (all || type == NETCONFA_MC_FORWARDING) 518 size += nla_total_size(4); 519 #endif 520 if (all || type == NETCONFA_PROXY_NEIGH) 521 size += nla_total_size(4); 522 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 524 size += nla_total_size(4); 525 526 return size; 527 } 528 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 530 struct ipv6_devconf *devconf, u32 portid, 531 u32 seq, int event, unsigned int flags, 532 int type) 533 { 534 struct nlmsghdr *nlh; 535 struct netconfmsg *ncm; 536 bool all = false; 537 538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 539 flags); 540 if (!nlh) 541 return -EMSGSIZE; 542 543 if (type == NETCONFA_ALL) 544 all = true; 545 546 ncm = nlmsg_data(nlh); 547 ncm->ncm_family = AF_INET6; 548 549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 550 goto nla_put_failure; 551 552 if (!devconf) 553 goto out; 554 555 if ((all || type == NETCONFA_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 557 goto nla_put_failure; 558 #ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 devconf->mc_forwarding) < 0) 562 goto nla_put_failure; 563 #endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 devconf->ignore_routes_with_linkdown) < 0) 571 goto nla_put_failure; 572 573 out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577 nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584 { 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602 errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604 } 605 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611 }; 612 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 614 struct nlmsghdr *nlh, 615 struct netlink_ext_ack *extack) 616 { 617 struct net *net = sock_net(in_skb->sk); 618 struct nlattr *tb[NETCONFA_MAX+1]; 619 struct netconfmsg *ncm; 620 struct sk_buff *skb; 621 struct ipv6_devconf *devconf; 622 struct inet6_dev *in6_dev; 623 struct net_device *dev; 624 int ifindex; 625 int err; 626 627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err < 0) 630 goto errout; 631 632 err = -EINVAL; 633 if (!tb[NETCONFA_IFINDEX]) 634 goto errout; 635 636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 637 switch (ifindex) { 638 case NETCONFA_IFINDEX_ALL: 639 devconf = net->ipv6.devconf_all; 640 break; 641 case NETCONFA_IFINDEX_DEFAULT: 642 devconf = net->ipv6.devconf_dflt; 643 break; 644 default: 645 dev = __dev_get_by_index(net, ifindex); 646 if (!dev) 647 goto errout; 648 in6_dev = __in6_dev_get(dev); 649 if (!in6_dev) 650 goto errout; 651 devconf = &in6_dev->cnf; 652 break; 653 } 654 655 err = -ENOBUFS; 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 657 if (!skb) 658 goto errout; 659 660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 661 NETLINK_CB(in_skb).portid, 662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 663 NETCONFA_ALL); 664 if (err < 0) { 665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 666 WARN_ON(err == -EMSGSIZE); 667 kfree_skb(skb); 668 goto errout; 669 } 670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 671 errout: 672 return err; 673 } 674 675 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 676 struct netlink_callback *cb) 677 { 678 struct net *net = sock_net(skb->sk); 679 int h, s_h; 680 int idx, s_idx; 681 struct net_device *dev; 682 struct inet6_dev *idev; 683 struct hlist_head *head; 684 685 s_h = cb->args[0]; 686 s_idx = idx = cb->args[1]; 687 688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 689 idx = 0; 690 head = &net->dev_index_head[h]; 691 rcu_read_lock(); 692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 693 net->dev_base_seq; 694 hlist_for_each_entry_rcu(dev, head, index_hlist) { 695 if (idx < s_idx) 696 goto cont; 697 idev = __in6_dev_get(dev); 698 if (!idev) 699 goto cont; 700 701 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 702 &idev->cnf, 703 NETLINK_CB(cb->skb).portid, 704 cb->nlh->nlmsg_seq, 705 RTM_NEWNETCONF, 706 NLM_F_MULTI, 707 NETCONFA_ALL) < 0) { 708 rcu_read_unlock(); 709 goto done; 710 } 711 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 712 cont: 713 idx++; 714 } 715 rcu_read_unlock(); 716 } 717 if (h == NETDEV_HASHENTRIES) { 718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 719 net->ipv6.devconf_all, 720 NETLINK_CB(cb->skb).portid, 721 cb->nlh->nlmsg_seq, 722 RTM_NEWNETCONF, NLM_F_MULTI, 723 NETCONFA_ALL) < 0) 724 goto done; 725 else 726 h++; 727 } 728 if (h == NETDEV_HASHENTRIES + 1) { 729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 730 net->ipv6.devconf_dflt, 731 NETLINK_CB(cb->skb).portid, 732 cb->nlh->nlmsg_seq, 733 RTM_NEWNETCONF, NLM_F_MULTI, 734 NETCONFA_ALL) < 0) 735 goto done; 736 else 737 h++; 738 } 739 done: 740 cb->args[0] = h; 741 cb->args[1] = idx; 742 743 return skb->len; 744 } 745 746 #ifdef CONFIG_SYSCTL 747 static void dev_forward_change(struct inet6_dev *idev) 748 { 749 struct net_device *dev; 750 struct inet6_ifaddr *ifa; 751 752 if (!idev) 753 return; 754 dev = idev->dev; 755 if (idev->cnf.forwarding) 756 dev_disable_lro(dev); 757 if (dev->flags & IFF_MULTICAST) { 758 if (idev->cnf.forwarding) { 759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 762 } else { 763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 766 } 767 } 768 769 list_for_each_entry(ifa, &idev->addr_list, if_list) { 770 if (ifa->flags&IFA_F_TENTATIVE) 771 continue; 772 if (idev->cnf.forwarding) 773 addrconf_join_anycast(ifa); 774 else 775 addrconf_leave_anycast(ifa); 776 } 777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 778 NETCONFA_FORWARDING, 779 dev->ifindex, &idev->cnf); 780 } 781 782 783 static void addrconf_forward_change(struct net *net, __s32 newf) 784 { 785 struct net_device *dev; 786 struct inet6_dev *idev; 787 788 for_each_netdev(net, dev) { 789 idev = __in6_dev_get(dev); 790 if (idev) { 791 int changed = (!idev->cnf.forwarding) ^ (!newf); 792 idev->cnf.forwarding = newf; 793 if (changed) 794 dev_forward_change(idev); 795 } 796 } 797 } 798 799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 800 { 801 struct net *net; 802 int old; 803 804 if (!rtnl_trylock()) 805 return restart_syscall(); 806 807 net = (struct net *)table->extra2; 808 old = *p; 809 *p = newf; 810 811 if (p == &net->ipv6.devconf_dflt->forwarding) { 812 if ((!newf) ^ (!old)) 813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 814 NETCONFA_FORWARDING, 815 NETCONFA_IFINDEX_DEFAULT, 816 net->ipv6.devconf_dflt); 817 rtnl_unlock(); 818 return 0; 819 } 820 821 if (p == &net->ipv6.devconf_all->forwarding) { 822 int old_dflt = net->ipv6.devconf_dflt->forwarding; 823 824 net->ipv6.devconf_dflt->forwarding = newf; 825 if ((!newf) ^ (!old_dflt)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_DEFAULT, 829 net->ipv6.devconf_dflt); 830 831 addrconf_forward_change(net, newf); 832 if ((!newf) ^ (!old)) 833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 834 NETCONFA_FORWARDING, 835 NETCONFA_IFINDEX_ALL, 836 net->ipv6.devconf_all); 837 } else if ((!newf) ^ (!old)) 838 dev_forward_change((struct inet6_dev *)table->extra1); 839 rtnl_unlock(); 840 841 if (newf) 842 rt6_purge_dflt_routers(net); 843 return 1; 844 } 845 846 static void addrconf_linkdown_change(struct net *net, __s32 newf) 847 { 848 struct net_device *dev; 849 struct inet6_dev *idev; 850 851 for_each_netdev(net, dev) { 852 idev = __in6_dev_get(dev); 853 if (idev) { 854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 855 856 idev->cnf.ignore_routes_with_linkdown = newf; 857 if (changed) 858 inet6_netconf_notify_devconf(dev_net(dev), 859 RTM_NEWNETCONF, 860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 861 dev->ifindex, 862 &idev->cnf); 863 } 864 } 865 } 866 867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 868 { 869 struct net *net; 870 int old; 871 872 if (!rtnl_trylock()) 873 return restart_syscall(); 874 875 net = (struct net *)table->extra2; 876 old = *p; 877 *p = newf; 878 879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 880 if ((!newf) ^ (!old)) 881 inet6_netconf_notify_devconf(net, 882 RTM_NEWNETCONF, 883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 884 NETCONFA_IFINDEX_DEFAULT, 885 net->ipv6.devconf_dflt); 886 rtnl_unlock(); 887 return 0; 888 } 889 890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 892 addrconf_linkdown_change(net, newf); 893 if ((!newf) ^ (!old)) 894 inet6_netconf_notify_devconf(net, 895 RTM_NEWNETCONF, 896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 897 NETCONFA_IFINDEX_ALL, 898 net->ipv6.devconf_all); 899 } 900 rtnl_unlock(); 901 902 return 1; 903 } 904 905 #endif 906 907 /* Nobody refers to this ifaddr, destroy it */ 908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 909 { 910 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 911 912 #ifdef NET_REFCNT_DEBUG 913 pr_debug("%s\n", __func__); 914 #endif 915 916 in6_dev_put(ifp->idev); 917 918 if (cancel_delayed_work(&ifp->dad_work)) 919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 920 ifp); 921 922 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 923 pr_warn("Freeing alive inet6 address %p\n", ifp); 924 return; 925 } 926 ip6_rt_put(ifp->rt); 927 928 kfree_rcu(ifp, rcu); 929 } 930 931 static void 932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 933 { 934 struct list_head *p; 935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 936 937 /* 938 * Each device address list is sorted in order of scope - 939 * global before linklocal. 940 */ 941 list_for_each(p, &idev->addr_list) { 942 struct inet6_ifaddr *ifa 943 = list_entry(p, struct inet6_ifaddr, if_list); 944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 945 break; 946 } 947 948 list_add_tail(&ifp->if_list, p); 949 } 950 951 static u32 inet6_addr_hash(const struct in6_addr *addr) 952 { 953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 954 } 955 956 /* On success it returns ifp with increased reference count */ 957 958 static struct inet6_ifaddr * 959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 960 const struct in6_addr *peer_addr, int pfxlen, 961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 962 { 963 struct net *net = dev_net(idev->dev); 964 struct inet6_ifaddr *ifa = NULL; 965 struct rt6_info *rt; 966 unsigned int hash; 967 int err = 0; 968 int addr_type = ipv6_addr_type(addr); 969 970 if (addr_type == IPV6_ADDR_ANY || 971 addr_type & IPV6_ADDR_MULTICAST || 972 (!(idev->dev->flags & IFF_LOOPBACK) && 973 addr_type & IPV6_ADDR_LOOPBACK)) 974 return ERR_PTR(-EADDRNOTAVAIL); 975 976 rcu_read_lock_bh(); 977 if (idev->dead) { 978 err = -ENODEV; /*XXX*/ 979 goto out2; 980 } 981 982 if (idev->cnf.disable_ipv6) { 983 err = -EACCES; 984 goto out2; 985 } 986 987 spin_lock(&addrconf_hash_lock); 988 989 /* Ignore adding duplicate addresses on an interface */ 990 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 991 ADBG("ipv6_add_addr: already assigned\n"); 992 err = -EEXIST; 993 goto out; 994 } 995 996 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 997 998 if (!ifa) { 999 ADBG("ipv6_add_addr: malloc failed\n"); 1000 err = -ENOBUFS; 1001 goto out; 1002 } 1003 1004 rt = addrconf_dst_alloc(idev, addr, false); 1005 if (IS_ERR(rt)) { 1006 err = PTR_ERR(rt); 1007 goto out; 1008 } 1009 1010 if (net->ipv6.devconf_all->disable_policy || 1011 idev->cnf.disable_policy) 1012 rt->dst.flags |= DST_NOPOLICY; 1013 1014 neigh_parms_data_state_setall(idev->nd_parms); 1015 1016 ifa->addr = *addr; 1017 if (peer_addr) 1018 ifa->peer_addr = *peer_addr; 1019 1020 spin_lock_init(&ifa->lock); 1021 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1022 INIT_HLIST_NODE(&ifa->addr_lst); 1023 ifa->scope = scope; 1024 ifa->prefix_len = pfxlen; 1025 ifa->flags = flags; 1026 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1027 if (!(flags & IFA_F_NODAD)) 1028 ifa->flags |= IFA_F_TENTATIVE; 1029 ifa->valid_lft = valid_lft; 1030 ifa->prefered_lft = prefered_lft; 1031 ifa->cstamp = ifa->tstamp = jiffies; 1032 ifa->tokenized = false; 1033 1034 ifa->rt = rt; 1035 1036 ifa->idev = idev; 1037 in6_dev_hold(idev); 1038 /* For caller */ 1039 in6_ifa_hold(ifa); 1040 1041 /* Add to big hash table */ 1042 hash = inet6_addr_hash(addr); 1043 1044 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1045 spin_unlock(&addrconf_hash_lock); 1046 1047 write_lock(&idev->lock); 1048 /* Add to inet6_dev unicast addr list. */ 1049 ipv6_link_dev_addr(idev, ifa); 1050 1051 if (ifa->flags&IFA_F_TEMPORARY) { 1052 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1053 in6_ifa_hold(ifa); 1054 } 1055 1056 in6_ifa_hold(ifa); 1057 write_unlock(&idev->lock); 1058 out2: 1059 rcu_read_unlock_bh(); 1060 1061 if (likely(err == 0)) 1062 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1063 else { 1064 kfree(ifa); 1065 ifa = ERR_PTR(err); 1066 } 1067 1068 return ifa; 1069 out: 1070 spin_unlock(&addrconf_hash_lock); 1071 goto out2; 1072 } 1073 1074 enum cleanup_prefix_rt_t { 1075 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1076 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1077 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1078 }; 1079 1080 /* 1081 * Check, whether the prefix for ifp would still need a prefix route 1082 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1083 * constants. 1084 * 1085 * 1) we don't purge prefix if address was not permanent. 1086 * prefix is managed by its own lifetime. 1087 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1088 * 3) if there are no addresses, delete prefix. 1089 * 4) if there are still other permanent address(es), 1090 * corresponding prefix is still permanent. 1091 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1092 * don't purge the prefix, assume user space is managing it. 1093 * 6) otherwise, update prefix lifetime to the 1094 * longest valid lifetime among the corresponding 1095 * addresses on the device. 1096 * Note: subsequent RA will update lifetime. 1097 **/ 1098 static enum cleanup_prefix_rt_t 1099 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1100 { 1101 struct inet6_ifaddr *ifa; 1102 struct inet6_dev *idev = ifp->idev; 1103 unsigned long lifetime; 1104 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1105 1106 *expires = jiffies; 1107 1108 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1109 if (ifa == ifp) 1110 continue; 1111 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1112 ifp->prefix_len)) 1113 continue; 1114 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1115 return CLEANUP_PREFIX_RT_NOP; 1116 1117 action = CLEANUP_PREFIX_RT_EXPIRE; 1118 1119 spin_lock(&ifa->lock); 1120 1121 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1122 /* 1123 * Note: Because this address is 1124 * not permanent, lifetime < 1125 * LONG_MAX / HZ here. 1126 */ 1127 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1128 *expires = ifa->tstamp + lifetime * HZ; 1129 spin_unlock(&ifa->lock); 1130 } 1131 1132 return action; 1133 } 1134 1135 static void 1136 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1137 { 1138 struct rt6_info *rt; 1139 1140 rt = addrconf_get_prefix_route(&ifp->addr, 1141 ifp->prefix_len, 1142 ifp->idev->dev, 1143 0, RTF_GATEWAY | RTF_DEFAULT); 1144 if (rt) { 1145 if (del_rt) 1146 ip6_del_rt(rt); 1147 else { 1148 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1149 rt6_set_expires(rt, expires); 1150 ip6_rt_put(rt); 1151 } 1152 } 1153 } 1154 1155 1156 /* This function wants to get referenced ifp and releases it before return */ 1157 1158 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1159 { 1160 int state; 1161 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1162 unsigned long expires; 1163 1164 ASSERT_RTNL(); 1165 1166 spin_lock_bh(&ifp->lock); 1167 state = ifp->state; 1168 ifp->state = INET6_IFADDR_STATE_DEAD; 1169 spin_unlock_bh(&ifp->lock); 1170 1171 if (state == INET6_IFADDR_STATE_DEAD) 1172 goto out; 1173 1174 spin_lock_bh(&addrconf_hash_lock); 1175 hlist_del_init_rcu(&ifp->addr_lst); 1176 spin_unlock_bh(&addrconf_hash_lock); 1177 1178 write_lock_bh(&ifp->idev->lock); 1179 1180 if (ifp->flags&IFA_F_TEMPORARY) { 1181 list_del(&ifp->tmp_list); 1182 if (ifp->ifpub) { 1183 in6_ifa_put(ifp->ifpub); 1184 ifp->ifpub = NULL; 1185 } 1186 __in6_ifa_put(ifp); 1187 } 1188 1189 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1190 action = check_cleanup_prefix_route(ifp, &expires); 1191 1192 list_del_init(&ifp->if_list); 1193 __in6_ifa_put(ifp); 1194 1195 write_unlock_bh(&ifp->idev->lock); 1196 1197 addrconf_del_dad_work(ifp); 1198 1199 ipv6_ifa_notify(RTM_DELADDR, ifp); 1200 1201 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1202 1203 if (action != CLEANUP_PREFIX_RT_NOP) { 1204 cleanup_prefix_route(ifp, expires, 1205 action == CLEANUP_PREFIX_RT_DEL); 1206 } 1207 1208 /* clean up prefsrc entries */ 1209 rt6_remove_prefsrc(ifp); 1210 out: 1211 in6_ifa_put(ifp); 1212 } 1213 1214 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1215 { 1216 struct inet6_dev *idev = ifp->idev; 1217 struct in6_addr addr, *tmpaddr; 1218 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1219 unsigned long regen_advance; 1220 int tmp_plen; 1221 int ret = 0; 1222 u32 addr_flags; 1223 unsigned long now = jiffies; 1224 long max_desync_factor; 1225 s32 cnf_temp_preferred_lft; 1226 1227 write_lock_bh(&idev->lock); 1228 if (ift) { 1229 spin_lock_bh(&ift->lock); 1230 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1231 spin_unlock_bh(&ift->lock); 1232 tmpaddr = &addr; 1233 } else { 1234 tmpaddr = NULL; 1235 } 1236 retry: 1237 in6_dev_hold(idev); 1238 if (idev->cnf.use_tempaddr <= 0) { 1239 write_unlock_bh(&idev->lock); 1240 pr_info("%s: use_tempaddr is disabled\n", __func__); 1241 in6_dev_put(idev); 1242 ret = -1; 1243 goto out; 1244 } 1245 spin_lock_bh(&ifp->lock); 1246 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1247 idev->cnf.use_tempaddr = -1; /*XXX*/ 1248 spin_unlock_bh(&ifp->lock); 1249 write_unlock_bh(&idev->lock); 1250 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1251 __func__); 1252 in6_dev_put(idev); 1253 ret = -1; 1254 goto out; 1255 } 1256 in6_ifa_hold(ifp); 1257 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1258 ipv6_try_regen_rndid(idev, tmpaddr); 1259 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1260 age = (now - ifp->tstamp) / HZ; 1261 1262 regen_advance = idev->cnf.regen_max_retry * 1263 idev->cnf.dad_transmits * 1264 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1265 1266 /* recalculate max_desync_factor each time and update 1267 * idev->desync_factor if it's larger 1268 */ 1269 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1270 max_desync_factor = min_t(__u32, 1271 idev->cnf.max_desync_factor, 1272 cnf_temp_preferred_lft - regen_advance); 1273 1274 if (unlikely(idev->desync_factor > max_desync_factor)) { 1275 if (max_desync_factor > 0) { 1276 get_random_bytes(&idev->desync_factor, 1277 sizeof(idev->desync_factor)); 1278 idev->desync_factor %= max_desync_factor; 1279 } else { 1280 idev->desync_factor = 0; 1281 } 1282 } 1283 1284 tmp_valid_lft = min_t(__u32, 1285 ifp->valid_lft, 1286 idev->cnf.temp_valid_lft + age); 1287 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1288 idev->desync_factor; 1289 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1290 tmp_plen = ifp->prefix_len; 1291 tmp_tstamp = ifp->tstamp; 1292 spin_unlock_bh(&ifp->lock); 1293 1294 write_unlock_bh(&idev->lock); 1295 1296 /* A temporary address is created only if this calculated Preferred 1297 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1298 * an implementation must not create a temporary address with a zero 1299 * Preferred Lifetime. 1300 * Use age calculation as in addrconf_verify to avoid unnecessary 1301 * temporary addresses being generated. 1302 */ 1303 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1304 if (tmp_prefered_lft <= regen_advance + age) { 1305 in6_ifa_put(ifp); 1306 in6_dev_put(idev); 1307 ret = -1; 1308 goto out; 1309 } 1310 1311 addr_flags = IFA_F_TEMPORARY; 1312 /* set in addrconf_prefix_rcv() */ 1313 if (ifp->flags & IFA_F_OPTIMISTIC) 1314 addr_flags |= IFA_F_OPTIMISTIC; 1315 1316 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1317 ipv6_addr_scope(&addr), addr_flags, 1318 tmp_valid_lft, tmp_prefered_lft); 1319 if (IS_ERR(ift)) { 1320 in6_ifa_put(ifp); 1321 in6_dev_put(idev); 1322 pr_info("%s: retry temporary address regeneration\n", __func__); 1323 tmpaddr = &addr; 1324 write_lock_bh(&idev->lock); 1325 goto retry; 1326 } 1327 1328 spin_lock_bh(&ift->lock); 1329 ift->ifpub = ifp; 1330 ift->cstamp = now; 1331 ift->tstamp = tmp_tstamp; 1332 spin_unlock_bh(&ift->lock); 1333 1334 addrconf_dad_start(ift); 1335 in6_ifa_put(ift); 1336 in6_dev_put(idev); 1337 out: 1338 return ret; 1339 } 1340 1341 /* 1342 * Choose an appropriate source address (RFC3484) 1343 */ 1344 enum { 1345 IPV6_SADDR_RULE_INIT = 0, 1346 IPV6_SADDR_RULE_LOCAL, 1347 IPV6_SADDR_RULE_SCOPE, 1348 IPV6_SADDR_RULE_PREFERRED, 1349 #ifdef CONFIG_IPV6_MIP6 1350 IPV6_SADDR_RULE_HOA, 1351 #endif 1352 IPV6_SADDR_RULE_OIF, 1353 IPV6_SADDR_RULE_LABEL, 1354 IPV6_SADDR_RULE_PRIVACY, 1355 IPV6_SADDR_RULE_ORCHID, 1356 IPV6_SADDR_RULE_PREFIX, 1357 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1358 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1359 #endif 1360 IPV6_SADDR_RULE_MAX 1361 }; 1362 1363 struct ipv6_saddr_score { 1364 int rule; 1365 int addr_type; 1366 struct inet6_ifaddr *ifa; 1367 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1368 int scopedist; 1369 int matchlen; 1370 }; 1371 1372 struct ipv6_saddr_dst { 1373 const struct in6_addr *addr; 1374 int ifindex; 1375 int scope; 1376 int label; 1377 unsigned int prefs; 1378 }; 1379 1380 static inline int ipv6_saddr_preferred(int type) 1381 { 1382 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1383 return 1; 1384 return 0; 1385 } 1386 1387 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1388 { 1389 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1390 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1391 #else 1392 return false; 1393 #endif 1394 } 1395 1396 static int ipv6_get_saddr_eval(struct net *net, 1397 struct ipv6_saddr_score *score, 1398 struct ipv6_saddr_dst *dst, 1399 int i) 1400 { 1401 int ret; 1402 1403 if (i <= score->rule) { 1404 switch (i) { 1405 case IPV6_SADDR_RULE_SCOPE: 1406 ret = score->scopedist; 1407 break; 1408 case IPV6_SADDR_RULE_PREFIX: 1409 ret = score->matchlen; 1410 break; 1411 default: 1412 ret = !!test_bit(i, score->scorebits); 1413 } 1414 goto out; 1415 } 1416 1417 switch (i) { 1418 case IPV6_SADDR_RULE_INIT: 1419 /* Rule 0: remember if hiscore is not ready yet */ 1420 ret = !!score->ifa; 1421 break; 1422 case IPV6_SADDR_RULE_LOCAL: 1423 /* Rule 1: Prefer same address */ 1424 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1425 break; 1426 case IPV6_SADDR_RULE_SCOPE: 1427 /* Rule 2: Prefer appropriate scope 1428 * 1429 * ret 1430 * ^ 1431 * -1 | d 15 1432 * ---+--+-+---> scope 1433 * | 1434 * | d is scope of the destination. 1435 * B-d | \ 1436 * | \ <- smaller scope is better if 1437 * B-15 | \ if scope is enough for destination. 1438 * | ret = B - scope (-1 <= scope >= d <= 15). 1439 * d-C-1 | / 1440 * |/ <- greater is better 1441 * -C / if scope is not enough for destination. 1442 * /| ret = scope - C (-1 <= d < scope <= 15). 1443 * 1444 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1445 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1446 * Assume B = 0 and we get C > 29. 1447 */ 1448 ret = __ipv6_addr_src_scope(score->addr_type); 1449 if (ret >= dst->scope) 1450 ret = -ret; 1451 else 1452 ret -= 128; /* 30 is enough */ 1453 score->scopedist = ret; 1454 break; 1455 case IPV6_SADDR_RULE_PREFERRED: 1456 { 1457 /* Rule 3: Avoid deprecated and optimistic addresses */ 1458 u8 avoid = IFA_F_DEPRECATED; 1459 1460 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1461 avoid |= IFA_F_OPTIMISTIC; 1462 ret = ipv6_saddr_preferred(score->addr_type) || 1463 !(score->ifa->flags & avoid); 1464 break; 1465 } 1466 #ifdef CONFIG_IPV6_MIP6 1467 case IPV6_SADDR_RULE_HOA: 1468 { 1469 /* Rule 4: Prefer home address */ 1470 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1471 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1472 break; 1473 } 1474 #endif 1475 case IPV6_SADDR_RULE_OIF: 1476 /* Rule 5: Prefer outgoing interface */ 1477 ret = (!dst->ifindex || 1478 dst->ifindex == score->ifa->idev->dev->ifindex); 1479 break; 1480 case IPV6_SADDR_RULE_LABEL: 1481 /* Rule 6: Prefer matching label */ 1482 ret = ipv6_addr_label(net, 1483 &score->ifa->addr, score->addr_type, 1484 score->ifa->idev->dev->ifindex) == dst->label; 1485 break; 1486 case IPV6_SADDR_RULE_PRIVACY: 1487 { 1488 /* Rule 7: Prefer public address 1489 * Note: prefer temporary address if use_tempaddr >= 2 1490 */ 1491 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1492 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1493 score->ifa->idev->cnf.use_tempaddr >= 2; 1494 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1495 break; 1496 } 1497 case IPV6_SADDR_RULE_ORCHID: 1498 /* Rule 8-: Prefer ORCHID vs ORCHID or 1499 * non-ORCHID vs non-ORCHID 1500 */ 1501 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1502 ipv6_addr_orchid(dst->addr)); 1503 break; 1504 case IPV6_SADDR_RULE_PREFIX: 1505 /* Rule 8: Use longest matching prefix */ 1506 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1507 if (ret > score->ifa->prefix_len) 1508 ret = score->ifa->prefix_len; 1509 score->matchlen = ret; 1510 break; 1511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1512 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1513 /* Optimistic addresses still have lower precedence than other 1514 * preferred addresses. 1515 */ 1516 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1517 break; 1518 #endif 1519 default: 1520 ret = 0; 1521 } 1522 1523 if (ret) 1524 __set_bit(i, score->scorebits); 1525 score->rule = i; 1526 out: 1527 return ret; 1528 } 1529 1530 static int __ipv6_dev_get_saddr(struct net *net, 1531 struct ipv6_saddr_dst *dst, 1532 struct inet6_dev *idev, 1533 struct ipv6_saddr_score *scores, 1534 int hiscore_idx) 1535 { 1536 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1537 1538 read_lock_bh(&idev->lock); 1539 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1540 int i; 1541 1542 /* 1543 * - Tentative Address (RFC2462 section 5.4) 1544 * - A tentative address is not considered 1545 * "assigned to an interface" in the traditional 1546 * sense, unless it is also flagged as optimistic. 1547 * - Candidate Source Address (section 4) 1548 * - In any case, anycast addresses, multicast 1549 * addresses, and the unspecified address MUST 1550 * NOT be included in a candidate set. 1551 */ 1552 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1553 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1554 continue; 1555 1556 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1557 1558 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1559 score->addr_type & IPV6_ADDR_MULTICAST)) { 1560 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1561 idev->dev->name); 1562 continue; 1563 } 1564 1565 score->rule = -1; 1566 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1567 1568 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1569 int minihiscore, miniscore; 1570 1571 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1572 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1573 1574 if (minihiscore > miniscore) { 1575 if (i == IPV6_SADDR_RULE_SCOPE && 1576 score->scopedist > 0) { 1577 /* 1578 * special case: 1579 * each remaining entry 1580 * has too small (not enough) 1581 * scope, because ifa entries 1582 * are sorted by their scope 1583 * values. 1584 */ 1585 goto out; 1586 } 1587 break; 1588 } else if (minihiscore < miniscore) { 1589 if (hiscore->ifa) 1590 in6_ifa_put(hiscore->ifa); 1591 1592 in6_ifa_hold(score->ifa); 1593 1594 swap(hiscore, score); 1595 hiscore_idx = 1 - hiscore_idx; 1596 1597 /* restore our iterator */ 1598 score->ifa = hiscore->ifa; 1599 1600 break; 1601 } 1602 } 1603 } 1604 out: 1605 read_unlock_bh(&idev->lock); 1606 return hiscore_idx; 1607 } 1608 1609 static int ipv6_get_saddr_master(struct net *net, 1610 const struct net_device *dst_dev, 1611 const struct net_device *master, 1612 struct ipv6_saddr_dst *dst, 1613 struct ipv6_saddr_score *scores, 1614 int hiscore_idx) 1615 { 1616 struct inet6_dev *idev; 1617 1618 idev = __in6_dev_get(dst_dev); 1619 if (idev) 1620 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1621 scores, hiscore_idx); 1622 1623 idev = __in6_dev_get(master); 1624 if (idev) 1625 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1626 scores, hiscore_idx); 1627 1628 return hiscore_idx; 1629 } 1630 1631 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1632 const struct in6_addr *daddr, unsigned int prefs, 1633 struct in6_addr *saddr) 1634 { 1635 struct ipv6_saddr_score scores[2], *hiscore; 1636 struct ipv6_saddr_dst dst; 1637 struct inet6_dev *idev; 1638 struct net_device *dev; 1639 int dst_type; 1640 bool use_oif_addr = false; 1641 int hiscore_idx = 0; 1642 1643 dst_type = __ipv6_addr_type(daddr); 1644 dst.addr = daddr; 1645 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1646 dst.scope = __ipv6_addr_src_scope(dst_type); 1647 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1648 dst.prefs = prefs; 1649 1650 scores[hiscore_idx].rule = -1; 1651 scores[hiscore_idx].ifa = NULL; 1652 1653 rcu_read_lock(); 1654 1655 /* Candidate Source Address (section 4) 1656 * - multicast and link-local destination address, 1657 * the set of candidate source address MUST only 1658 * include addresses assigned to interfaces 1659 * belonging to the same link as the outgoing 1660 * interface. 1661 * (- For site-local destination addresses, the 1662 * set of candidate source addresses MUST only 1663 * include addresses assigned to interfaces 1664 * belonging to the same site as the outgoing 1665 * interface.) 1666 * - "It is RECOMMENDED that the candidate source addresses 1667 * be the set of unicast addresses assigned to the 1668 * interface that will be used to send to the destination 1669 * (the 'outgoing' interface)." (RFC 6724) 1670 */ 1671 if (dst_dev) { 1672 idev = __in6_dev_get(dst_dev); 1673 if ((dst_type & IPV6_ADDR_MULTICAST) || 1674 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1675 (idev && idev->cnf.use_oif_addrs_only)) { 1676 use_oif_addr = true; 1677 } 1678 } 1679 1680 if (use_oif_addr) { 1681 if (idev) 1682 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1683 } else { 1684 const struct net_device *master; 1685 int master_idx = 0; 1686 1687 /* if dst_dev exists and is enslaved to an L3 device, then 1688 * prefer addresses from dst_dev and then the master over 1689 * any other enslaved devices in the L3 domain. 1690 */ 1691 master = l3mdev_master_dev_rcu(dst_dev); 1692 if (master) { 1693 master_idx = master->ifindex; 1694 1695 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1696 master, &dst, 1697 scores, hiscore_idx); 1698 1699 if (scores[hiscore_idx].ifa) 1700 goto out; 1701 } 1702 1703 for_each_netdev_rcu(net, dev) { 1704 /* only consider addresses on devices in the 1705 * same L3 domain 1706 */ 1707 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1708 continue; 1709 idev = __in6_dev_get(dev); 1710 if (!idev) 1711 continue; 1712 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1713 } 1714 } 1715 1716 out: 1717 rcu_read_unlock(); 1718 1719 hiscore = &scores[hiscore_idx]; 1720 if (!hiscore->ifa) 1721 return -EADDRNOTAVAIL; 1722 1723 *saddr = hiscore->ifa->addr; 1724 in6_ifa_put(hiscore->ifa); 1725 return 0; 1726 } 1727 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1728 1729 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1730 u32 banned_flags) 1731 { 1732 struct inet6_ifaddr *ifp; 1733 int err = -EADDRNOTAVAIL; 1734 1735 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1736 if (ifp->scope > IFA_LINK) 1737 break; 1738 if (ifp->scope == IFA_LINK && 1739 !(ifp->flags & banned_flags)) { 1740 *addr = ifp->addr; 1741 err = 0; 1742 break; 1743 } 1744 } 1745 return err; 1746 } 1747 1748 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1749 u32 banned_flags) 1750 { 1751 struct inet6_dev *idev; 1752 int err = -EADDRNOTAVAIL; 1753 1754 rcu_read_lock(); 1755 idev = __in6_dev_get(dev); 1756 if (idev) { 1757 read_lock_bh(&idev->lock); 1758 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1759 read_unlock_bh(&idev->lock); 1760 } 1761 rcu_read_unlock(); 1762 return err; 1763 } 1764 1765 static int ipv6_count_addresses(struct inet6_dev *idev) 1766 { 1767 int cnt = 0; 1768 struct inet6_ifaddr *ifp; 1769 1770 read_lock_bh(&idev->lock); 1771 list_for_each_entry(ifp, &idev->addr_list, if_list) 1772 cnt++; 1773 read_unlock_bh(&idev->lock); 1774 return cnt; 1775 } 1776 1777 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1778 const struct net_device *dev, int strict) 1779 { 1780 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1781 } 1782 EXPORT_SYMBOL(ipv6_chk_addr); 1783 1784 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1785 const struct net_device *dev, int strict, 1786 u32 banned_flags) 1787 { 1788 struct inet6_ifaddr *ifp; 1789 unsigned int hash = inet6_addr_hash(addr); 1790 u32 ifp_flags; 1791 1792 rcu_read_lock_bh(); 1793 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1794 if (!net_eq(dev_net(ifp->idev->dev), net)) 1795 continue; 1796 /* Decouple optimistic from tentative for evaluation here. 1797 * Ban optimistic addresses explicitly, when required. 1798 */ 1799 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1800 ? (ifp->flags&~IFA_F_TENTATIVE) 1801 : ifp->flags; 1802 if (ipv6_addr_equal(&ifp->addr, addr) && 1803 !(ifp_flags&banned_flags) && 1804 (!dev || ifp->idev->dev == dev || 1805 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1806 rcu_read_unlock_bh(); 1807 return 1; 1808 } 1809 } 1810 1811 rcu_read_unlock_bh(); 1812 return 0; 1813 } 1814 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1815 1816 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1817 struct net_device *dev) 1818 { 1819 unsigned int hash = inet6_addr_hash(addr); 1820 struct inet6_ifaddr *ifp; 1821 1822 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1823 if (!net_eq(dev_net(ifp->idev->dev), net)) 1824 continue; 1825 if (ipv6_addr_equal(&ifp->addr, addr)) { 1826 if (!dev || ifp->idev->dev == dev) 1827 return true; 1828 } 1829 } 1830 return false; 1831 } 1832 1833 /* Compares an address/prefix_len with addresses on device @dev. 1834 * If one is found it returns true. 1835 */ 1836 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1837 const unsigned int prefix_len, struct net_device *dev) 1838 { 1839 struct inet6_dev *idev; 1840 struct inet6_ifaddr *ifa; 1841 bool ret = false; 1842 1843 rcu_read_lock(); 1844 idev = __in6_dev_get(dev); 1845 if (idev) { 1846 read_lock_bh(&idev->lock); 1847 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1848 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1849 if (ret) 1850 break; 1851 } 1852 read_unlock_bh(&idev->lock); 1853 } 1854 rcu_read_unlock(); 1855 1856 return ret; 1857 } 1858 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1859 1860 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1861 { 1862 struct inet6_dev *idev; 1863 struct inet6_ifaddr *ifa; 1864 int onlink; 1865 1866 onlink = 0; 1867 rcu_read_lock(); 1868 idev = __in6_dev_get(dev); 1869 if (idev) { 1870 read_lock_bh(&idev->lock); 1871 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1872 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1873 ifa->prefix_len); 1874 if (onlink) 1875 break; 1876 } 1877 read_unlock_bh(&idev->lock); 1878 } 1879 rcu_read_unlock(); 1880 return onlink; 1881 } 1882 EXPORT_SYMBOL(ipv6_chk_prefix); 1883 1884 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1885 struct net_device *dev, int strict) 1886 { 1887 struct inet6_ifaddr *ifp, *result = NULL; 1888 unsigned int hash = inet6_addr_hash(addr); 1889 1890 rcu_read_lock_bh(); 1891 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1892 if (!net_eq(dev_net(ifp->idev->dev), net)) 1893 continue; 1894 if (ipv6_addr_equal(&ifp->addr, addr)) { 1895 if (!dev || ifp->idev->dev == dev || 1896 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1897 result = ifp; 1898 in6_ifa_hold(ifp); 1899 break; 1900 } 1901 } 1902 } 1903 rcu_read_unlock_bh(); 1904 1905 return result; 1906 } 1907 1908 /* Gets referenced address, destroys ifaddr */ 1909 1910 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1911 { 1912 if (dad_failed) 1913 ifp->flags |= IFA_F_DADFAILED; 1914 1915 if (ifp->flags&IFA_F_PERMANENT) { 1916 spin_lock_bh(&ifp->lock); 1917 addrconf_del_dad_work(ifp); 1918 ifp->flags |= IFA_F_TENTATIVE; 1919 spin_unlock_bh(&ifp->lock); 1920 if (dad_failed) 1921 ipv6_ifa_notify(0, ifp); 1922 in6_ifa_put(ifp); 1923 } else if (ifp->flags&IFA_F_TEMPORARY) { 1924 struct inet6_ifaddr *ifpub; 1925 spin_lock_bh(&ifp->lock); 1926 ifpub = ifp->ifpub; 1927 if (ifpub) { 1928 in6_ifa_hold(ifpub); 1929 spin_unlock_bh(&ifp->lock); 1930 ipv6_create_tempaddr(ifpub, ifp); 1931 in6_ifa_put(ifpub); 1932 } else { 1933 spin_unlock_bh(&ifp->lock); 1934 } 1935 ipv6_del_addr(ifp); 1936 } else { 1937 ipv6_del_addr(ifp); 1938 } 1939 } 1940 1941 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1942 { 1943 int err = -ENOENT; 1944 1945 spin_lock_bh(&ifp->lock); 1946 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1947 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1948 err = 0; 1949 } 1950 spin_unlock_bh(&ifp->lock); 1951 1952 return err; 1953 } 1954 1955 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1956 { 1957 struct inet6_dev *idev = ifp->idev; 1958 struct net *net = dev_net(ifp->idev->dev); 1959 1960 if (addrconf_dad_end(ifp)) { 1961 in6_ifa_put(ifp); 1962 return; 1963 } 1964 1965 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1966 ifp->idev->dev->name, &ifp->addr); 1967 1968 spin_lock_bh(&ifp->lock); 1969 1970 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1971 int scope = ifp->scope; 1972 u32 flags = ifp->flags; 1973 struct in6_addr new_addr; 1974 struct inet6_ifaddr *ifp2; 1975 u32 valid_lft, preferred_lft; 1976 int pfxlen = ifp->prefix_len; 1977 int retries = ifp->stable_privacy_retry + 1; 1978 1979 if (retries > net->ipv6.sysctl.idgen_retries) { 1980 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1981 ifp->idev->dev->name); 1982 goto errdad; 1983 } 1984 1985 new_addr = ifp->addr; 1986 if (ipv6_generate_stable_address(&new_addr, retries, 1987 idev)) 1988 goto errdad; 1989 1990 valid_lft = ifp->valid_lft; 1991 preferred_lft = ifp->prefered_lft; 1992 1993 spin_unlock_bh(&ifp->lock); 1994 1995 if (idev->cnf.max_addresses && 1996 ipv6_count_addresses(idev) >= 1997 idev->cnf.max_addresses) 1998 goto lock_errdad; 1999 2000 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2001 ifp->idev->dev->name); 2002 2003 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2004 scope, flags, valid_lft, 2005 preferred_lft); 2006 if (IS_ERR(ifp2)) 2007 goto lock_errdad; 2008 2009 spin_lock_bh(&ifp2->lock); 2010 ifp2->stable_privacy_retry = retries; 2011 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2012 spin_unlock_bh(&ifp2->lock); 2013 2014 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2015 in6_ifa_put(ifp2); 2016 lock_errdad: 2017 spin_lock_bh(&ifp->lock); 2018 } 2019 2020 errdad: 2021 /* transition from _POSTDAD to _ERRDAD */ 2022 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2023 spin_unlock_bh(&ifp->lock); 2024 2025 addrconf_mod_dad_work(ifp, 0); 2026 in6_ifa_put(ifp); 2027 } 2028 2029 /* Join to solicited addr multicast group. 2030 * caller must hold RTNL */ 2031 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2032 { 2033 struct in6_addr maddr; 2034 2035 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2036 return; 2037 2038 addrconf_addr_solict_mult(addr, &maddr); 2039 ipv6_dev_mc_inc(dev, &maddr); 2040 } 2041 2042 /* caller must hold RTNL */ 2043 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2044 { 2045 struct in6_addr maddr; 2046 2047 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2048 return; 2049 2050 addrconf_addr_solict_mult(addr, &maddr); 2051 __ipv6_dev_mc_dec(idev, &maddr); 2052 } 2053 2054 /* caller must hold RTNL */ 2055 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2056 { 2057 struct in6_addr addr; 2058 2059 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2060 return; 2061 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2062 if (ipv6_addr_any(&addr)) 2063 return; 2064 __ipv6_dev_ac_inc(ifp->idev, &addr); 2065 } 2066 2067 /* caller must hold RTNL */ 2068 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2069 { 2070 struct in6_addr addr; 2071 2072 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2073 return; 2074 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2075 if (ipv6_addr_any(&addr)) 2076 return; 2077 __ipv6_dev_ac_dec(ifp->idev, &addr); 2078 } 2079 2080 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2081 { 2082 switch (dev->addr_len) { 2083 case ETH_ALEN: 2084 memcpy(eui, dev->dev_addr, 3); 2085 eui[3] = 0xFF; 2086 eui[4] = 0xFE; 2087 memcpy(eui + 5, dev->dev_addr + 3, 3); 2088 break; 2089 case EUI64_ADDR_LEN: 2090 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2091 eui[0] ^= 2; 2092 break; 2093 default: 2094 return -1; 2095 } 2096 2097 return 0; 2098 } 2099 2100 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2101 { 2102 union fwnet_hwaddr *ha; 2103 2104 if (dev->addr_len != FWNET_ALEN) 2105 return -1; 2106 2107 ha = (union fwnet_hwaddr *)dev->dev_addr; 2108 2109 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2110 eui[0] ^= 2; 2111 return 0; 2112 } 2113 2114 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2115 { 2116 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2117 if (dev->addr_len != ARCNET_ALEN) 2118 return -1; 2119 memset(eui, 0, 7); 2120 eui[7] = *(u8 *)dev->dev_addr; 2121 return 0; 2122 } 2123 2124 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2125 { 2126 if (dev->addr_len != INFINIBAND_ALEN) 2127 return -1; 2128 memcpy(eui, dev->dev_addr + 12, 8); 2129 eui[0] |= 2; 2130 return 0; 2131 } 2132 2133 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2134 { 2135 if (addr == 0) 2136 return -1; 2137 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2138 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2139 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2140 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2141 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2142 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2143 eui[1] = 0; 2144 eui[2] = 0x5E; 2145 eui[3] = 0xFE; 2146 memcpy(eui + 4, &addr, 4); 2147 return 0; 2148 } 2149 2150 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2151 { 2152 if (dev->priv_flags & IFF_ISATAP) 2153 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2154 return -1; 2155 } 2156 2157 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2158 { 2159 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2160 } 2161 2162 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2163 { 2164 memcpy(eui, dev->perm_addr, 3); 2165 memcpy(eui + 5, dev->perm_addr + 3, 3); 2166 eui[3] = 0xFF; 2167 eui[4] = 0xFE; 2168 eui[0] ^= 2; 2169 return 0; 2170 } 2171 2172 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2173 { 2174 switch (dev->type) { 2175 case ARPHRD_ETHER: 2176 case ARPHRD_FDDI: 2177 return addrconf_ifid_eui48(eui, dev); 2178 case ARPHRD_ARCNET: 2179 return addrconf_ifid_arcnet(eui, dev); 2180 case ARPHRD_INFINIBAND: 2181 return addrconf_ifid_infiniband(eui, dev); 2182 case ARPHRD_SIT: 2183 return addrconf_ifid_sit(eui, dev); 2184 case ARPHRD_IPGRE: 2185 case ARPHRD_TUNNEL: 2186 return addrconf_ifid_gre(eui, dev); 2187 case ARPHRD_6LOWPAN: 2188 return addrconf_ifid_6lowpan(eui, dev); 2189 case ARPHRD_IEEE1394: 2190 return addrconf_ifid_ieee1394(eui, dev); 2191 case ARPHRD_TUNNEL6: 2192 case ARPHRD_IP6GRE: 2193 return addrconf_ifid_ip6tnl(eui, dev); 2194 } 2195 return -1; 2196 } 2197 2198 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2199 { 2200 int err = -1; 2201 struct inet6_ifaddr *ifp; 2202 2203 read_lock_bh(&idev->lock); 2204 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2205 if (ifp->scope > IFA_LINK) 2206 break; 2207 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2208 memcpy(eui, ifp->addr.s6_addr+8, 8); 2209 err = 0; 2210 break; 2211 } 2212 } 2213 read_unlock_bh(&idev->lock); 2214 return err; 2215 } 2216 2217 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2218 static void ipv6_regen_rndid(struct inet6_dev *idev) 2219 { 2220 regen: 2221 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2222 idev->rndid[0] &= ~0x02; 2223 2224 /* 2225 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2226 * check if generated address is not inappropriate 2227 * 2228 * - Reserved subnet anycast (RFC 2526) 2229 * 11111101 11....11 1xxxxxxx 2230 * - ISATAP (RFC4214) 6.1 2231 * 00-00-5E-FE-xx-xx-xx-xx 2232 * - value 0 2233 * - XXX: already assigned to an address on the device 2234 */ 2235 if (idev->rndid[0] == 0xfd && 2236 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2237 (idev->rndid[7]&0x80)) 2238 goto regen; 2239 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2240 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2241 goto regen; 2242 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2243 goto regen; 2244 } 2245 } 2246 2247 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2248 { 2249 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2250 ipv6_regen_rndid(idev); 2251 } 2252 2253 /* 2254 * Add prefix route. 2255 */ 2256 2257 static void 2258 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2259 unsigned long expires, u32 flags) 2260 { 2261 struct fib6_config cfg = { 2262 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2263 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2264 .fc_ifindex = dev->ifindex, 2265 .fc_expires = expires, 2266 .fc_dst_len = plen, 2267 .fc_flags = RTF_UP | flags, 2268 .fc_nlinfo.nl_net = dev_net(dev), 2269 .fc_protocol = RTPROT_KERNEL, 2270 }; 2271 2272 cfg.fc_dst = *pfx; 2273 2274 /* Prevent useless cloning on PtP SIT. 2275 This thing is done here expecting that the whole 2276 class of non-broadcast devices need not cloning. 2277 */ 2278 #if IS_ENABLED(CONFIG_IPV6_SIT) 2279 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2280 cfg.fc_flags |= RTF_NONEXTHOP; 2281 #endif 2282 2283 ip6_route_add(&cfg); 2284 } 2285 2286 2287 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2288 int plen, 2289 const struct net_device *dev, 2290 u32 flags, u32 noflags) 2291 { 2292 struct fib6_node *fn; 2293 struct rt6_info *rt = NULL; 2294 struct fib6_table *table; 2295 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2296 2297 table = fib6_get_table(dev_net(dev), tb_id); 2298 if (!table) 2299 return NULL; 2300 2301 read_lock_bh(&table->tb6_lock); 2302 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2303 if (!fn) 2304 goto out; 2305 2306 noflags |= RTF_CACHE; 2307 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2308 if (rt->dst.dev->ifindex != dev->ifindex) 2309 continue; 2310 if ((rt->rt6i_flags & flags) != flags) 2311 continue; 2312 if ((rt->rt6i_flags & noflags) != 0) 2313 continue; 2314 dst_hold(&rt->dst); 2315 break; 2316 } 2317 out: 2318 read_unlock_bh(&table->tb6_lock); 2319 return rt; 2320 } 2321 2322 2323 /* Create "default" multicast route to the interface */ 2324 2325 static void addrconf_add_mroute(struct net_device *dev) 2326 { 2327 struct fib6_config cfg = { 2328 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2329 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2330 .fc_ifindex = dev->ifindex, 2331 .fc_dst_len = 8, 2332 .fc_flags = RTF_UP, 2333 .fc_nlinfo.nl_net = dev_net(dev), 2334 }; 2335 2336 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2337 2338 ip6_route_add(&cfg); 2339 } 2340 2341 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2342 { 2343 struct inet6_dev *idev; 2344 2345 ASSERT_RTNL(); 2346 2347 idev = ipv6_find_idev(dev); 2348 if (!idev) 2349 return ERR_PTR(-ENOBUFS); 2350 2351 if (idev->cnf.disable_ipv6) 2352 return ERR_PTR(-EACCES); 2353 2354 /* Add default multicast route */ 2355 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2356 addrconf_add_mroute(dev); 2357 2358 return idev; 2359 } 2360 2361 static void manage_tempaddrs(struct inet6_dev *idev, 2362 struct inet6_ifaddr *ifp, 2363 __u32 valid_lft, __u32 prefered_lft, 2364 bool create, unsigned long now) 2365 { 2366 u32 flags; 2367 struct inet6_ifaddr *ift; 2368 2369 read_lock_bh(&idev->lock); 2370 /* update all temporary addresses in the list */ 2371 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2372 int age, max_valid, max_prefered; 2373 2374 if (ifp != ift->ifpub) 2375 continue; 2376 2377 /* RFC 4941 section 3.3: 2378 * If a received option will extend the lifetime of a public 2379 * address, the lifetimes of temporary addresses should 2380 * be extended, subject to the overall constraint that no 2381 * temporary addresses should ever remain "valid" or "preferred" 2382 * for a time longer than (TEMP_VALID_LIFETIME) or 2383 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2384 */ 2385 age = (now - ift->cstamp) / HZ; 2386 max_valid = idev->cnf.temp_valid_lft - age; 2387 if (max_valid < 0) 2388 max_valid = 0; 2389 2390 max_prefered = idev->cnf.temp_prefered_lft - 2391 idev->desync_factor - age; 2392 if (max_prefered < 0) 2393 max_prefered = 0; 2394 2395 if (valid_lft > max_valid) 2396 valid_lft = max_valid; 2397 2398 if (prefered_lft > max_prefered) 2399 prefered_lft = max_prefered; 2400 2401 spin_lock(&ift->lock); 2402 flags = ift->flags; 2403 ift->valid_lft = valid_lft; 2404 ift->prefered_lft = prefered_lft; 2405 ift->tstamp = now; 2406 if (prefered_lft > 0) 2407 ift->flags &= ~IFA_F_DEPRECATED; 2408 2409 spin_unlock(&ift->lock); 2410 if (!(flags&IFA_F_TENTATIVE)) 2411 ipv6_ifa_notify(0, ift); 2412 } 2413 2414 if ((create || list_empty(&idev->tempaddr_list)) && 2415 idev->cnf.use_tempaddr > 0) { 2416 /* When a new public address is created as described 2417 * in [ADDRCONF], also create a new temporary address. 2418 * Also create a temporary address if it's enabled but 2419 * no temporary address currently exists. 2420 */ 2421 read_unlock_bh(&idev->lock); 2422 ipv6_create_tempaddr(ifp, NULL); 2423 } else { 2424 read_unlock_bh(&idev->lock); 2425 } 2426 } 2427 2428 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2429 { 2430 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2431 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2432 } 2433 2434 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2435 const struct prefix_info *pinfo, 2436 struct inet6_dev *in6_dev, 2437 const struct in6_addr *addr, int addr_type, 2438 u32 addr_flags, bool sllao, bool tokenized, 2439 __u32 valid_lft, u32 prefered_lft) 2440 { 2441 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2442 int create = 0, update_lft = 0; 2443 2444 if (!ifp && valid_lft) { 2445 int max_addresses = in6_dev->cnf.max_addresses; 2446 2447 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2448 if (in6_dev->cnf.optimistic_dad && 2449 !net->ipv6.devconf_all->forwarding && sllao) 2450 addr_flags |= IFA_F_OPTIMISTIC; 2451 #endif 2452 2453 /* Do not allow to create too much of autoconfigured 2454 * addresses; this would be too easy way to crash kernel. 2455 */ 2456 if (!max_addresses || 2457 ipv6_count_addresses(in6_dev) < max_addresses) 2458 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2459 pinfo->prefix_len, 2460 addr_type&IPV6_ADDR_SCOPE_MASK, 2461 addr_flags, valid_lft, 2462 prefered_lft); 2463 2464 if (IS_ERR_OR_NULL(ifp)) 2465 return -1; 2466 2467 update_lft = 0; 2468 create = 1; 2469 spin_lock_bh(&ifp->lock); 2470 ifp->flags |= IFA_F_MANAGETEMPADDR; 2471 ifp->cstamp = jiffies; 2472 ifp->tokenized = tokenized; 2473 spin_unlock_bh(&ifp->lock); 2474 addrconf_dad_start(ifp); 2475 } 2476 2477 if (ifp) { 2478 u32 flags; 2479 unsigned long now; 2480 u32 stored_lft; 2481 2482 /* update lifetime (RFC2462 5.5.3 e) */ 2483 spin_lock_bh(&ifp->lock); 2484 now = jiffies; 2485 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2486 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2487 else 2488 stored_lft = 0; 2489 if (!update_lft && !create && stored_lft) { 2490 const u32 minimum_lft = min_t(u32, 2491 stored_lft, MIN_VALID_LIFETIME); 2492 valid_lft = max(valid_lft, minimum_lft); 2493 2494 /* RFC4862 Section 5.5.3e: 2495 * "Note that the preferred lifetime of the 2496 * corresponding address is always reset to 2497 * the Preferred Lifetime in the received 2498 * Prefix Information option, regardless of 2499 * whether the valid lifetime is also reset or 2500 * ignored." 2501 * 2502 * So we should always update prefered_lft here. 2503 */ 2504 update_lft = 1; 2505 } 2506 2507 if (update_lft) { 2508 ifp->valid_lft = valid_lft; 2509 ifp->prefered_lft = prefered_lft; 2510 ifp->tstamp = now; 2511 flags = ifp->flags; 2512 ifp->flags &= ~IFA_F_DEPRECATED; 2513 spin_unlock_bh(&ifp->lock); 2514 2515 if (!(flags&IFA_F_TENTATIVE)) 2516 ipv6_ifa_notify(0, ifp); 2517 } else 2518 spin_unlock_bh(&ifp->lock); 2519 2520 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2521 create, now); 2522 2523 in6_ifa_put(ifp); 2524 addrconf_verify(); 2525 } 2526 2527 return 0; 2528 } 2529 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2530 2531 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2532 { 2533 struct prefix_info *pinfo; 2534 __u32 valid_lft; 2535 __u32 prefered_lft; 2536 int addr_type, err; 2537 u32 addr_flags = 0; 2538 struct inet6_dev *in6_dev; 2539 struct net *net = dev_net(dev); 2540 2541 pinfo = (struct prefix_info *) opt; 2542 2543 if (len < sizeof(struct prefix_info)) { 2544 ADBG("addrconf: prefix option too short\n"); 2545 return; 2546 } 2547 2548 /* 2549 * Validation checks ([ADDRCONF], page 19) 2550 */ 2551 2552 addr_type = ipv6_addr_type(&pinfo->prefix); 2553 2554 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2555 return; 2556 2557 valid_lft = ntohl(pinfo->valid); 2558 prefered_lft = ntohl(pinfo->prefered); 2559 2560 if (prefered_lft > valid_lft) { 2561 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2562 return; 2563 } 2564 2565 in6_dev = in6_dev_get(dev); 2566 2567 if (!in6_dev) { 2568 net_dbg_ratelimited("addrconf: device %s not configured\n", 2569 dev->name); 2570 return; 2571 } 2572 2573 /* 2574 * Two things going on here: 2575 * 1) Add routes for on-link prefixes 2576 * 2) Configure prefixes with the auto flag set 2577 */ 2578 2579 if (pinfo->onlink) { 2580 struct rt6_info *rt; 2581 unsigned long rt_expires; 2582 2583 /* Avoid arithmetic overflow. Really, we could 2584 * save rt_expires in seconds, likely valid_lft, 2585 * but it would require division in fib gc, that it 2586 * not good. 2587 */ 2588 if (HZ > USER_HZ) 2589 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2590 else 2591 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2592 2593 if (addrconf_finite_timeout(rt_expires)) 2594 rt_expires *= HZ; 2595 2596 rt = addrconf_get_prefix_route(&pinfo->prefix, 2597 pinfo->prefix_len, 2598 dev, 2599 RTF_ADDRCONF | RTF_PREFIX_RT, 2600 RTF_GATEWAY | RTF_DEFAULT); 2601 2602 if (rt) { 2603 /* Autoconf prefix route */ 2604 if (valid_lft == 0) { 2605 ip6_del_rt(rt); 2606 rt = NULL; 2607 } else if (addrconf_finite_timeout(rt_expires)) { 2608 /* not infinity */ 2609 rt6_set_expires(rt, jiffies + rt_expires); 2610 } else { 2611 rt6_clean_expires(rt); 2612 } 2613 } else if (valid_lft) { 2614 clock_t expires = 0; 2615 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2616 if (addrconf_finite_timeout(rt_expires)) { 2617 /* not infinity */ 2618 flags |= RTF_EXPIRES; 2619 expires = jiffies_to_clock_t(rt_expires); 2620 } 2621 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2622 dev, expires, flags); 2623 } 2624 ip6_rt_put(rt); 2625 } 2626 2627 /* Try to figure out our local address for this prefix */ 2628 2629 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2630 struct in6_addr addr; 2631 bool tokenized = false, dev_addr_generated = false; 2632 2633 if (pinfo->prefix_len == 64) { 2634 memcpy(&addr, &pinfo->prefix, 8); 2635 2636 if (!ipv6_addr_any(&in6_dev->token)) { 2637 read_lock_bh(&in6_dev->lock); 2638 memcpy(addr.s6_addr + 8, 2639 in6_dev->token.s6_addr + 8, 8); 2640 read_unlock_bh(&in6_dev->lock); 2641 tokenized = true; 2642 } else if (is_addr_mode_generate_stable(in6_dev) && 2643 !ipv6_generate_stable_address(&addr, 0, 2644 in6_dev)) { 2645 addr_flags |= IFA_F_STABLE_PRIVACY; 2646 goto ok; 2647 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2648 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2649 goto put; 2650 } else { 2651 dev_addr_generated = true; 2652 } 2653 goto ok; 2654 } 2655 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2656 pinfo->prefix_len); 2657 goto put; 2658 2659 ok: 2660 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2661 &addr, addr_type, 2662 addr_flags, sllao, 2663 tokenized, valid_lft, 2664 prefered_lft); 2665 if (err) 2666 goto put; 2667 2668 /* Ignore error case here because previous prefix add addr was 2669 * successful which will be notified. 2670 */ 2671 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2672 addr_type, addr_flags, sllao, 2673 tokenized, valid_lft, 2674 prefered_lft, 2675 dev_addr_generated); 2676 } 2677 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2678 put: 2679 in6_dev_put(in6_dev); 2680 } 2681 2682 /* 2683 * Set destination address. 2684 * Special case for SIT interfaces where we create a new "virtual" 2685 * device. 2686 */ 2687 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2688 { 2689 struct in6_ifreq ireq; 2690 struct net_device *dev; 2691 int err = -EINVAL; 2692 2693 rtnl_lock(); 2694 2695 err = -EFAULT; 2696 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2697 goto err_exit; 2698 2699 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2700 2701 err = -ENODEV; 2702 if (!dev) 2703 goto err_exit; 2704 2705 #if IS_ENABLED(CONFIG_IPV6_SIT) 2706 if (dev->type == ARPHRD_SIT) { 2707 const struct net_device_ops *ops = dev->netdev_ops; 2708 struct ifreq ifr; 2709 struct ip_tunnel_parm p; 2710 2711 err = -EADDRNOTAVAIL; 2712 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2713 goto err_exit; 2714 2715 memset(&p, 0, sizeof(p)); 2716 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2717 p.iph.saddr = 0; 2718 p.iph.version = 4; 2719 p.iph.ihl = 5; 2720 p.iph.protocol = IPPROTO_IPV6; 2721 p.iph.ttl = 64; 2722 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2723 2724 if (ops->ndo_do_ioctl) { 2725 mm_segment_t oldfs = get_fs(); 2726 2727 set_fs(KERNEL_DS); 2728 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2729 set_fs(oldfs); 2730 } else 2731 err = -EOPNOTSUPP; 2732 2733 if (err == 0) { 2734 err = -ENOBUFS; 2735 dev = __dev_get_by_name(net, p.name); 2736 if (!dev) 2737 goto err_exit; 2738 err = dev_open(dev); 2739 } 2740 } 2741 #endif 2742 2743 err_exit: 2744 rtnl_unlock(); 2745 return err; 2746 } 2747 2748 static int ipv6_mc_config(struct sock *sk, bool join, 2749 const struct in6_addr *addr, int ifindex) 2750 { 2751 int ret; 2752 2753 ASSERT_RTNL(); 2754 2755 lock_sock(sk); 2756 if (join) 2757 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2758 else 2759 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2760 release_sock(sk); 2761 2762 return ret; 2763 } 2764 2765 /* 2766 * Manual configuration of address on an interface 2767 */ 2768 static int inet6_addr_add(struct net *net, int ifindex, 2769 const struct in6_addr *pfx, 2770 const struct in6_addr *peer_pfx, 2771 unsigned int plen, __u32 ifa_flags, 2772 __u32 prefered_lft, __u32 valid_lft) 2773 { 2774 struct inet6_ifaddr *ifp; 2775 struct inet6_dev *idev; 2776 struct net_device *dev; 2777 unsigned long timeout; 2778 clock_t expires; 2779 int scope; 2780 u32 flags; 2781 2782 ASSERT_RTNL(); 2783 2784 if (plen > 128) 2785 return -EINVAL; 2786 2787 /* check the lifetime */ 2788 if (!valid_lft || prefered_lft > valid_lft) 2789 return -EINVAL; 2790 2791 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2792 return -EINVAL; 2793 2794 dev = __dev_get_by_index(net, ifindex); 2795 if (!dev) 2796 return -ENODEV; 2797 2798 idev = addrconf_add_dev(dev); 2799 if (IS_ERR(idev)) 2800 return PTR_ERR(idev); 2801 2802 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2803 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2804 true, pfx, ifindex); 2805 2806 if (ret < 0) 2807 return ret; 2808 } 2809 2810 scope = ipv6_addr_scope(pfx); 2811 2812 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2813 if (addrconf_finite_timeout(timeout)) { 2814 expires = jiffies_to_clock_t(timeout * HZ); 2815 valid_lft = timeout; 2816 flags = RTF_EXPIRES; 2817 } else { 2818 expires = 0; 2819 flags = 0; 2820 ifa_flags |= IFA_F_PERMANENT; 2821 } 2822 2823 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2824 if (addrconf_finite_timeout(timeout)) { 2825 if (timeout == 0) 2826 ifa_flags |= IFA_F_DEPRECATED; 2827 prefered_lft = timeout; 2828 } 2829 2830 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2831 valid_lft, prefered_lft); 2832 2833 if (!IS_ERR(ifp)) { 2834 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2835 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2836 expires, flags); 2837 } 2838 2839 /* 2840 * Note that section 3.1 of RFC 4429 indicates 2841 * that the Optimistic flag should not be set for 2842 * manually configured addresses 2843 */ 2844 addrconf_dad_start(ifp); 2845 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2846 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2847 true, jiffies); 2848 in6_ifa_put(ifp); 2849 addrconf_verify_rtnl(); 2850 return 0; 2851 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2852 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2853 false, pfx, ifindex); 2854 } 2855 2856 return PTR_ERR(ifp); 2857 } 2858 2859 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2860 const struct in6_addr *pfx, unsigned int plen) 2861 { 2862 struct inet6_ifaddr *ifp; 2863 struct inet6_dev *idev; 2864 struct net_device *dev; 2865 2866 if (plen > 128) 2867 return -EINVAL; 2868 2869 dev = __dev_get_by_index(net, ifindex); 2870 if (!dev) 2871 return -ENODEV; 2872 2873 idev = __in6_dev_get(dev); 2874 if (!idev) 2875 return -ENXIO; 2876 2877 read_lock_bh(&idev->lock); 2878 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2879 if (ifp->prefix_len == plen && 2880 ipv6_addr_equal(pfx, &ifp->addr)) { 2881 in6_ifa_hold(ifp); 2882 read_unlock_bh(&idev->lock); 2883 2884 if (!(ifp->flags & IFA_F_TEMPORARY) && 2885 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2886 manage_tempaddrs(idev, ifp, 0, 0, false, 2887 jiffies); 2888 ipv6_del_addr(ifp); 2889 addrconf_verify_rtnl(); 2890 if (ipv6_addr_is_multicast(pfx)) { 2891 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2892 false, pfx, dev->ifindex); 2893 } 2894 return 0; 2895 } 2896 } 2897 read_unlock_bh(&idev->lock); 2898 return -EADDRNOTAVAIL; 2899 } 2900 2901 2902 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2903 { 2904 struct in6_ifreq ireq; 2905 int err; 2906 2907 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2908 return -EPERM; 2909 2910 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2911 return -EFAULT; 2912 2913 rtnl_lock(); 2914 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2915 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2916 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2917 rtnl_unlock(); 2918 return err; 2919 } 2920 2921 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2922 { 2923 struct in6_ifreq ireq; 2924 int err; 2925 2926 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2927 return -EPERM; 2928 2929 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2930 return -EFAULT; 2931 2932 rtnl_lock(); 2933 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2934 ireq.ifr6_prefixlen); 2935 rtnl_unlock(); 2936 return err; 2937 } 2938 2939 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2940 int plen, int scope) 2941 { 2942 struct inet6_ifaddr *ifp; 2943 2944 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2945 scope, IFA_F_PERMANENT, 2946 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2947 if (!IS_ERR(ifp)) { 2948 spin_lock_bh(&ifp->lock); 2949 ifp->flags &= ~IFA_F_TENTATIVE; 2950 spin_unlock_bh(&ifp->lock); 2951 rt_genid_bump_ipv6(dev_net(idev->dev)); 2952 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2953 in6_ifa_put(ifp); 2954 } 2955 } 2956 2957 #if IS_ENABLED(CONFIG_IPV6_SIT) 2958 static void sit_add_v4_addrs(struct inet6_dev *idev) 2959 { 2960 struct in6_addr addr; 2961 struct net_device *dev; 2962 struct net *net = dev_net(idev->dev); 2963 int scope, plen; 2964 u32 pflags = 0; 2965 2966 ASSERT_RTNL(); 2967 2968 memset(&addr, 0, sizeof(struct in6_addr)); 2969 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2970 2971 if (idev->dev->flags&IFF_POINTOPOINT) { 2972 addr.s6_addr32[0] = htonl(0xfe800000); 2973 scope = IFA_LINK; 2974 plen = 64; 2975 } else { 2976 scope = IPV6_ADDR_COMPATv4; 2977 plen = 96; 2978 pflags |= RTF_NONEXTHOP; 2979 } 2980 2981 if (addr.s6_addr32[3]) { 2982 add_addr(idev, &addr, plen, scope); 2983 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2984 return; 2985 } 2986 2987 for_each_netdev(net, dev) { 2988 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2989 if (in_dev && (dev->flags & IFF_UP)) { 2990 struct in_ifaddr *ifa; 2991 2992 int flag = scope; 2993 2994 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2995 2996 addr.s6_addr32[3] = ifa->ifa_local; 2997 2998 if (ifa->ifa_scope == RT_SCOPE_LINK) 2999 continue; 3000 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3001 if (idev->dev->flags&IFF_POINTOPOINT) 3002 continue; 3003 flag |= IFA_HOST; 3004 } 3005 3006 add_addr(idev, &addr, plen, flag); 3007 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3008 pflags); 3009 } 3010 } 3011 } 3012 } 3013 #endif 3014 3015 static void init_loopback(struct net_device *dev) 3016 { 3017 struct inet6_dev *idev; 3018 struct net_device *sp_dev; 3019 struct inet6_ifaddr *sp_ifa; 3020 struct rt6_info *sp_rt; 3021 3022 /* ::1 */ 3023 3024 ASSERT_RTNL(); 3025 3026 idev = ipv6_find_idev(dev); 3027 if (!idev) { 3028 pr_debug("%s: add_dev failed\n", __func__); 3029 return; 3030 } 3031 3032 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3033 3034 /* Add routes to other interface's IPv6 addresses */ 3035 for_each_netdev(dev_net(dev), sp_dev) { 3036 if (!strcmp(sp_dev->name, dev->name)) 3037 continue; 3038 3039 idev = __in6_dev_get(sp_dev); 3040 if (!idev) 3041 continue; 3042 3043 read_lock_bh(&idev->lock); 3044 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3045 3046 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3047 continue; 3048 3049 if (sp_ifa->rt) { 3050 /* This dst has been added to garbage list when 3051 * lo device down, release this obsolete dst and 3052 * reallocate a new router for ifa. 3053 */ 3054 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3055 ip6_rt_put(sp_ifa->rt); 3056 sp_ifa->rt = NULL; 3057 } else { 3058 continue; 3059 } 3060 } 3061 3062 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3063 3064 /* Failure cases are ignored */ 3065 if (!IS_ERR(sp_rt)) { 3066 sp_ifa->rt = sp_rt; 3067 ip6_ins_rt(sp_rt); 3068 } 3069 } 3070 read_unlock_bh(&idev->lock); 3071 } 3072 } 3073 3074 void addrconf_add_linklocal(struct inet6_dev *idev, 3075 const struct in6_addr *addr, u32 flags) 3076 { 3077 struct inet6_ifaddr *ifp; 3078 u32 addr_flags = flags | IFA_F_PERMANENT; 3079 3080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3081 if (idev->cnf.optimistic_dad && 3082 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3083 addr_flags |= IFA_F_OPTIMISTIC; 3084 #endif 3085 3086 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3087 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3088 if (!IS_ERR(ifp)) { 3089 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3090 addrconf_dad_start(ifp); 3091 in6_ifa_put(ifp); 3092 } 3093 } 3094 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3095 3096 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3097 { 3098 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3099 return true; 3100 3101 if (address.s6_addr32[2] == htonl(0x02005eff) && 3102 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3103 return true; 3104 3105 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3106 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3107 return true; 3108 3109 return false; 3110 } 3111 3112 static int ipv6_generate_stable_address(struct in6_addr *address, 3113 u8 dad_count, 3114 const struct inet6_dev *idev) 3115 { 3116 static DEFINE_SPINLOCK(lock); 3117 static __u32 digest[SHA_DIGEST_WORDS]; 3118 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3119 3120 static union { 3121 char __data[SHA_MESSAGE_BYTES]; 3122 struct { 3123 struct in6_addr secret; 3124 __be32 prefix[2]; 3125 unsigned char hwaddr[MAX_ADDR_LEN]; 3126 u8 dad_count; 3127 } __packed; 3128 } data; 3129 3130 struct in6_addr secret; 3131 struct in6_addr temp; 3132 struct net *net = dev_net(idev->dev); 3133 3134 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3135 3136 if (idev->cnf.stable_secret.initialized) 3137 secret = idev->cnf.stable_secret.secret; 3138 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3139 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3140 else 3141 return -1; 3142 3143 retry: 3144 spin_lock_bh(&lock); 3145 3146 sha_init(digest); 3147 memset(&data, 0, sizeof(data)); 3148 memset(workspace, 0, sizeof(workspace)); 3149 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3150 data.prefix[0] = address->s6_addr32[0]; 3151 data.prefix[1] = address->s6_addr32[1]; 3152 data.secret = secret; 3153 data.dad_count = dad_count; 3154 3155 sha_transform(digest, data.__data, workspace); 3156 3157 temp = *address; 3158 temp.s6_addr32[2] = (__force __be32)digest[0]; 3159 temp.s6_addr32[3] = (__force __be32)digest[1]; 3160 3161 spin_unlock_bh(&lock); 3162 3163 if (ipv6_reserved_interfaceid(temp)) { 3164 dad_count++; 3165 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3166 return -1; 3167 goto retry; 3168 } 3169 3170 *address = temp; 3171 return 0; 3172 } 3173 3174 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3175 { 3176 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3177 3178 if (s->initialized) 3179 return; 3180 s = &idev->cnf.stable_secret; 3181 get_random_bytes(&s->secret, sizeof(s->secret)); 3182 s->initialized = true; 3183 } 3184 3185 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3186 { 3187 struct in6_addr addr; 3188 3189 /* no link local addresses on L3 master devices */ 3190 if (netif_is_l3_master(idev->dev)) 3191 return; 3192 3193 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3194 3195 switch (idev->cnf.addr_gen_mode) { 3196 case IN6_ADDR_GEN_MODE_RANDOM: 3197 ipv6_gen_mode_random_init(idev); 3198 /* fallthrough */ 3199 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3200 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3201 addrconf_add_linklocal(idev, &addr, 3202 IFA_F_STABLE_PRIVACY); 3203 else if (prefix_route) 3204 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3205 break; 3206 case IN6_ADDR_GEN_MODE_EUI64: 3207 /* addrconf_add_linklocal also adds a prefix_route and we 3208 * only need to care about prefix routes if ipv6_generate_eui64 3209 * couldn't generate one. 3210 */ 3211 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3212 addrconf_add_linklocal(idev, &addr, 0); 3213 else if (prefix_route) 3214 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3215 break; 3216 case IN6_ADDR_GEN_MODE_NONE: 3217 default: 3218 /* will not add any link local address */ 3219 break; 3220 } 3221 } 3222 3223 static void addrconf_dev_config(struct net_device *dev) 3224 { 3225 struct inet6_dev *idev; 3226 3227 ASSERT_RTNL(); 3228 3229 if ((dev->type != ARPHRD_ETHER) && 3230 (dev->type != ARPHRD_FDDI) && 3231 (dev->type != ARPHRD_ARCNET) && 3232 (dev->type != ARPHRD_INFINIBAND) && 3233 (dev->type != ARPHRD_IEEE1394) && 3234 (dev->type != ARPHRD_TUNNEL6) && 3235 (dev->type != ARPHRD_6LOWPAN) && 3236 (dev->type != ARPHRD_IP6GRE) && 3237 (dev->type != ARPHRD_IPGRE) && 3238 (dev->type != ARPHRD_TUNNEL) && 3239 (dev->type != ARPHRD_NONE)) { 3240 /* Alas, we support only Ethernet autoconfiguration. */ 3241 return; 3242 } 3243 3244 idev = addrconf_add_dev(dev); 3245 if (IS_ERR(idev)) 3246 return; 3247 3248 /* this device type has no EUI support */ 3249 if (dev->type == ARPHRD_NONE && 3250 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3251 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3252 3253 addrconf_addr_gen(idev, false); 3254 } 3255 3256 #if IS_ENABLED(CONFIG_IPV6_SIT) 3257 static void addrconf_sit_config(struct net_device *dev) 3258 { 3259 struct inet6_dev *idev; 3260 3261 ASSERT_RTNL(); 3262 3263 /* 3264 * Configure the tunnel with one of our IPv4 3265 * addresses... we should configure all of 3266 * our v4 addrs in the tunnel 3267 */ 3268 3269 idev = ipv6_find_idev(dev); 3270 if (!idev) { 3271 pr_debug("%s: add_dev failed\n", __func__); 3272 return; 3273 } 3274 3275 if (dev->priv_flags & IFF_ISATAP) { 3276 addrconf_addr_gen(idev, false); 3277 return; 3278 } 3279 3280 sit_add_v4_addrs(idev); 3281 3282 if (dev->flags&IFF_POINTOPOINT) 3283 addrconf_add_mroute(dev); 3284 } 3285 #endif 3286 3287 #if IS_ENABLED(CONFIG_NET_IPGRE) 3288 static void addrconf_gre_config(struct net_device *dev) 3289 { 3290 struct inet6_dev *idev; 3291 3292 ASSERT_RTNL(); 3293 3294 idev = ipv6_find_idev(dev); 3295 if (!idev) { 3296 pr_debug("%s: add_dev failed\n", __func__); 3297 return; 3298 } 3299 3300 addrconf_addr_gen(idev, true); 3301 if (dev->flags & IFF_POINTOPOINT) 3302 addrconf_add_mroute(dev); 3303 } 3304 #endif 3305 3306 static int fixup_permanent_addr(struct inet6_dev *idev, 3307 struct inet6_ifaddr *ifp) 3308 { 3309 /* rt6i_ref == 0 means the host route was removed from the 3310 * FIB, for example, if 'lo' device is taken down. In that 3311 * case regenerate the host route. 3312 */ 3313 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) { 3314 struct rt6_info *rt, *prev; 3315 3316 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3317 if (unlikely(IS_ERR(rt))) 3318 return PTR_ERR(rt); 3319 3320 /* ifp->rt can be accessed outside of rtnl */ 3321 spin_lock(&ifp->lock); 3322 prev = ifp->rt; 3323 ifp->rt = rt; 3324 spin_unlock(&ifp->lock); 3325 3326 ip6_rt_put(prev); 3327 } 3328 3329 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3330 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3331 idev->dev, 0, 0); 3332 } 3333 3334 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3335 addrconf_dad_start(ifp); 3336 3337 return 0; 3338 } 3339 3340 static void addrconf_permanent_addr(struct net_device *dev) 3341 { 3342 struct inet6_ifaddr *ifp, *tmp; 3343 struct inet6_dev *idev; 3344 3345 idev = __in6_dev_get(dev); 3346 if (!idev) 3347 return; 3348 3349 write_lock_bh(&idev->lock); 3350 3351 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3352 if ((ifp->flags & IFA_F_PERMANENT) && 3353 fixup_permanent_addr(idev, ifp) < 0) { 3354 write_unlock_bh(&idev->lock); 3355 ipv6_del_addr(ifp); 3356 write_lock_bh(&idev->lock); 3357 3358 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3359 idev->dev->name, &ifp->addr); 3360 } 3361 } 3362 3363 write_unlock_bh(&idev->lock); 3364 } 3365 3366 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3367 void *ptr) 3368 { 3369 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3370 struct netdev_notifier_changeupper_info *info; 3371 struct inet6_dev *idev = __in6_dev_get(dev); 3372 int run_pending = 0; 3373 int err; 3374 3375 switch (event) { 3376 case NETDEV_REGISTER: 3377 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3378 idev = ipv6_add_dev(dev); 3379 if (IS_ERR(idev)) 3380 return notifier_from_errno(PTR_ERR(idev)); 3381 } 3382 break; 3383 3384 case NETDEV_CHANGEMTU: 3385 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3386 if (dev->mtu < IPV6_MIN_MTU) { 3387 addrconf_ifdown(dev, 1); 3388 break; 3389 } 3390 3391 if (idev) { 3392 rt6_mtu_change(dev, dev->mtu); 3393 idev->cnf.mtu6 = dev->mtu; 3394 break; 3395 } 3396 3397 /* allocate new idev */ 3398 idev = ipv6_add_dev(dev); 3399 if (IS_ERR(idev)) 3400 break; 3401 3402 /* device is still not ready */ 3403 if (!(idev->if_flags & IF_READY)) 3404 break; 3405 3406 run_pending = 1; 3407 3408 /* fall through */ 3409 3410 case NETDEV_UP: 3411 case NETDEV_CHANGE: 3412 if (dev->flags & IFF_SLAVE) 3413 break; 3414 3415 if (idev && idev->cnf.disable_ipv6) 3416 break; 3417 3418 if (event == NETDEV_UP) { 3419 /* restore routes for permanent addresses */ 3420 addrconf_permanent_addr(dev); 3421 3422 if (!addrconf_qdisc_ok(dev)) { 3423 /* device is not ready yet. */ 3424 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3425 dev->name); 3426 break; 3427 } 3428 3429 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3430 idev = ipv6_add_dev(dev); 3431 3432 if (!IS_ERR_OR_NULL(idev)) { 3433 idev->if_flags |= IF_READY; 3434 run_pending = 1; 3435 } 3436 } else if (event == NETDEV_CHANGE) { 3437 if (!addrconf_qdisc_ok(dev)) { 3438 /* device is still not ready. */ 3439 break; 3440 } 3441 3442 if (idev) { 3443 if (idev->if_flags & IF_READY) { 3444 /* device is already configured - 3445 * but resend MLD reports, we might 3446 * have roamed and need to update 3447 * multicast snooping switches 3448 */ 3449 ipv6_mc_up(idev); 3450 break; 3451 } 3452 idev->if_flags |= IF_READY; 3453 } 3454 3455 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3456 dev->name); 3457 3458 run_pending = 1; 3459 } 3460 3461 switch (dev->type) { 3462 #if IS_ENABLED(CONFIG_IPV6_SIT) 3463 case ARPHRD_SIT: 3464 addrconf_sit_config(dev); 3465 break; 3466 #endif 3467 #if IS_ENABLED(CONFIG_NET_IPGRE) 3468 case ARPHRD_IPGRE: 3469 addrconf_gre_config(dev); 3470 break; 3471 #endif 3472 case ARPHRD_LOOPBACK: 3473 init_loopback(dev); 3474 break; 3475 3476 default: 3477 addrconf_dev_config(dev); 3478 break; 3479 } 3480 3481 if (!IS_ERR_OR_NULL(idev)) { 3482 if (run_pending) 3483 addrconf_dad_run(idev); 3484 3485 /* 3486 * If the MTU changed during the interface down, 3487 * when the interface up, the changed MTU must be 3488 * reflected in the idev as well as routers. 3489 */ 3490 if (idev->cnf.mtu6 != dev->mtu && 3491 dev->mtu >= IPV6_MIN_MTU) { 3492 rt6_mtu_change(dev, dev->mtu); 3493 idev->cnf.mtu6 = dev->mtu; 3494 } 3495 idev->tstamp = jiffies; 3496 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3497 3498 /* 3499 * If the changed mtu during down is lower than 3500 * IPV6_MIN_MTU stop IPv6 on this interface. 3501 */ 3502 if (dev->mtu < IPV6_MIN_MTU) 3503 addrconf_ifdown(dev, 1); 3504 } 3505 break; 3506 3507 case NETDEV_DOWN: 3508 case NETDEV_UNREGISTER: 3509 /* 3510 * Remove all addresses from this interface. 3511 */ 3512 addrconf_ifdown(dev, event != NETDEV_DOWN); 3513 break; 3514 3515 case NETDEV_CHANGENAME: 3516 if (idev) { 3517 snmp6_unregister_dev(idev); 3518 addrconf_sysctl_unregister(idev); 3519 err = addrconf_sysctl_register(idev); 3520 if (err) 3521 return notifier_from_errno(err); 3522 err = snmp6_register_dev(idev); 3523 if (err) { 3524 addrconf_sysctl_unregister(idev); 3525 return notifier_from_errno(err); 3526 } 3527 } 3528 break; 3529 3530 case NETDEV_PRE_TYPE_CHANGE: 3531 case NETDEV_POST_TYPE_CHANGE: 3532 if (idev) 3533 addrconf_type_change(dev, event); 3534 break; 3535 3536 case NETDEV_CHANGEUPPER: 3537 info = ptr; 3538 3539 /* flush all routes if dev is linked to or unlinked from 3540 * an L3 master device (e.g., VRF) 3541 */ 3542 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3543 addrconf_ifdown(dev, 0); 3544 } 3545 3546 return NOTIFY_OK; 3547 } 3548 3549 /* 3550 * addrconf module should be notified of a device going up 3551 */ 3552 static struct notifier_block ipv6_dev_notf = { 3553 .notifier_call = addrconf_notify, 3554 .priority = ADDRCONF_NOTIFY_PRIORITY, 3555 }; 3556 3557 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3558 { 3559 struct inet6_dev *idev; 3560 ASSERT_RTNL(); 3561 3562 idev = __in6_dev_get(dev); 3563 3564 if (event == NETDEV_POST_TYPE_CHANGE) 3565 ipv6_mc_remap(idev); 3566 else if (event == NETDEV_PRE_TYPE_CHANGE) 3567 ipv6_mc_unmap(idev); 3568 } 3569 3570 static bool addr_is_local(const struct in6_addr *addr) 3571 { 3572 return ipv6_addr_type(addr) & 3573 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3574 } 3575 3576 static int addrconf_ifdown(struct net_device *dev, int how) 3577 { 3578 struct net *net = dev_net(dev); 3579 struct inet6_dev *idev; 3580 struct inet6_ifaddr *ifa, *tmp; 3581 struct list_head del_list; 3582 int _keep_addr; 3583 bool keep_addr; 3584 int state, i; 3585 3586 ASSERT_RTNL(); 3587 3588 rt6_ifdown(net, dev); 3589 neigh_ifdown(&nd_tbl, dev); 3590 3591 idev = __in6_dev_get(dev); 3592 if (!idev) 3593 return -ENODEV; 3594 3595 /* 3596 * Step 1: remove reference to ipv6 device from parent device. 3597 * Do not dev_put! 3598 */ 3599 if (how) { 3600 idev->dead = 1; 3601 3602 /* protected by rtnl_lock */ 3603 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3604 3605 /* Step 1.5: remove snmp6 entry */ 3606 snmp6_unregister_dev(idev); 3607 3608 } 3609 3610 /* aggregate the system setting and interface setting */ 3611 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3612 if (!_keep_addr) 3613 _keep_addr = idev->cnf.keep_addr_on_down; 3614 3615 /* combine the user config with event to determine if permanent 3616 * addresses are to be removed from address hash table 3617 */ 3618 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3619 3620 /* Step 2: clear hash table */ 3621 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3622 struct hlist_head *h = &inet6_addr_lst[i]; 3623 3624 spin_lock_bh(&addrconf_hash_lock); 3625 restart: 3626 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3627 if (ifa->idev == idev) { 3628 addrconf_del_dad_work(ifa); 3629 /* combined flag + permanent flag decide if 3630 * address is retained on a down event 3631 */ 3632 if (!keep_addr || 3633 !(ifa->flags & IFA_F_PERMANENT) || 3634 addr_is_local(&ifa->addr)) { 3635 hlist_del_init_rcu(&ifa->addr_lst); 3636 goto restart; 3637 } 3638 } 3639 } 3640 spin_unlock_bh(&addrconf_hash_lock); 3641 } 3642 3643 write_lock_bh(&idev->lock); 3644 3645 addrconf_del_rs_timer(idev); 3646 3647 /* Step 2: clear flags for stateless addrconf */ 3648 if (!how) 3649 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3650 3651 /* Step 3: clear tempaddr list */ 3652 while (!list_empty(&idev->tempaddr_list)) { 3653 ifa = list_first_entry(&idev->tempaddr_list, 3654 struct inet6_ifaddr, tmp_list); 3655 list_del(&ifa->tmp_list); 3656 write_unlock_bh(&idev->lock); 3657 spin_lock_bh(&ifa->lock); 3658 3659 if (ifa->ifpub) { 3660 in6_ifa_put(ifa->ifpub); 3661 ifa->ifpub = NULL; 3662 } 3663 spin_unlock_bh(&ifa->lock); 3664 in6_ifa_put(ifa); 3665 write_lock_bh(&idev->lock); 3666 } 3667 3668 /* re-combine the user config with event to determine if permanent 3669 * addresses are to be removed from the interface list 3670 */ 3671 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3672 3673 INIT_LIST_HEAD(&del_list); 3674 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3675 struct rt6_info *rt = NULL; 3676 bool keep; 3677 3678 addrconf_del_dad_work(ifa); 3679 3680 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3681 !addr_is_local(&ifa->addr); 3682 if (!keep) 3683 list_move(&ifa->if_list, &del_list); 3684 3685 write_unlock_bh(&idev->lock); 3686 spin_lock_bh(&ifa->lock); 3687 3688 if (keep) { 3689 /* set state to skip the notifier below */ 3690 state = INET6_IFADDR_STATE_DEAD; 3691 ifa->state = INET6_IFADDR_STATE_PREDAD; 3692 if (!(ifa->flags & IFA_F_NODAD)) 3693 ifa->flags |= IFA_F_TENTATIVE; 3694 3695 rt = ifa->rt; 3696 ifa->rt = NULL; 3697 } else { 3698 state = ifa->state; 3699 ifa->state = INET6_IFADDR_STATE_DEAD; 3700 } 3701 3702 spin_unlock_bh(&ifa->lock); 3703 3704 if (rt) 3705 ip6_del_rt(rt); 3706 3707 if (state != INET6_IFADDR_STATE_DEAD) { 3708 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3709 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3710 } else { 3711 if (idev->cnf.forwarding) 3712 addrconf_leave_anycast(ifa); 3713 addrconf_leave_solict(ifa->idev, &ifa->addr); 3714 } 3715 3716 write_lock_bh(&idev->lock); 3717 } 3718 3719 write_unlock_bh(&idev->lock); 3720 3721 /* now clean up addresses to be removed */ 3722 while (!list_empty(&del_list)) { 3723 ifa = list_first_entry(&del_list, 3724 struct inet6_ifaddr, if_list); 3725 list_del(&ifa->if_list); 3726 3727 in6_ifa_put(ifa); 3728 } 3729 3730 /* Step 5: Discard anycast and multicast list */ 3731 if (how) { 3732 ipv6_ac_destroy_dev(idev); 3733 ipv6_mc_destroy_dev(idev); 3734 } else { 3735 ipv6_mc_down(idev); 3736 } 3737 3738 idev->tstamp = jiffies; 3739 3740 /* Last: Shot the device (if unregistered) */ 3741 if (how) { 3742 addrconf_sysctl_unregister(idev); 3743 neigh_parms_release(&nd_tbl, idev->nd_parms); 3744 neigh_ifdown(&nd_tbl, dev); 3745 in6_dev_put(idev); 3746 } 3747 return 0; 3748 } 3749 3750 static void addrconf_rs_timer(unsigned long data) 3751 { 3752 struct inet6_dev *idev = (struct inet6_dev *)data; 3753 struct net_device *dev = idev->dev; 3754 struct in6_addr lladdr; 3755 3756 write_lock(&idev->lock); 3757 if (idev->dead || !(idev->if_flags & IF_READY)) 3758 goto out; 3759 3760 if (!ipv6_accept_ra(idev)) 3761 goto out; 3762 3763 /* Announcement received after solicitation was sent */ 3764 if (idev->if_flags & IF_RA_RCVD) 3765 goto out; 3766 3767 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3768 write_unlock(&idev->lock); 3769 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3770 ndisc_send_rs(dev, &lladdr, 3771 &in6addr_linklocal_allrouters); 3772 else 3773 goto put; 3774 3775 write_lock(&idev->lock); 3776 idev->rs_interval = rfc3315_s14_backoff_update( 3777 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3778 /* The wait after the last probe can be shorter */ 3779 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3780 idev->cnf.rtr_solicits) ? 3781 idev->cnf.rtr_solicit_delay : 3782 idev->rs_interval); 3783 } else { 3784 /* 3785 * Note: we do not support deprecated "all on-link" 3786 * assumption any longer. 3787 */ 3788 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3789 } 3790 3791 out: 3792 write_unlock(&idev->lock); 3793 put: 3794 in6_dev_put(idev); 3795 } 3796 3797 /* 3798 * Duplicate Address Detection 3799 */ 3800 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3801 { 3802 unsigned long rand_num; 3803 struct inet6_dev *idev = ifp->idev; 3804 u64 nonce; 3805 3806 if (ifp->flags & IFA_F_OPTIMISTIC) 3807 rand_num = 0; 3808 else 3809 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3810 3811 nonce = 0; 3812 if (idev->cnf.enhanced_dad || 3813 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3814 do 3815 get_random_bytes(&nonce, 6); 3816 while (nonce == 0); 3817 } 3818 ifp->dad_nonce = nonce; 3819 ifp->dad_probes = idev->cnf.dad_transmits; 3820 addrconf_mod_dad_work(ifp, rand_num); 3821 } 3822 3823 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3824 { 3825 struct inet6_dev *idev = ifp->idev; 3826 struct net_device *dev = idev->dev; 3827 bool bump_id, notify = false; 3828 3829 addrconf_join_solict(dev, &ifp->addr); 3830 3831 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3832 3833 read_lock_bh(&idev->lock); 3834 spin_lock(&ifp->lock); 3835 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3836 goto out; 3837 3838 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3839 idev->cnf.accept_dad < 1 || 3840 !(ifp->flags&IFA_F_TENTATIVE) || 3841 ifp->flags & IFA_F_NODAD) { 3842 bump_id = ifp->flags & IFA_F_TENTATIVE; 3843 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3844 spin_unlock(&ifp->lock); 3845 read_unlock_bh(&idev->lock); 3846 3847 addrconf_dad_completed(ifp, bump_id); 3848 return; 3849 } 3850 3851 if (!(idev->if_flags & IF_READY)) { 3852 spin_unlock(&ifp->lock); 3853 read_unlock_bh(&idev->lock); 3854 /* 3855 * If the device is not ready: 3856 * - keep it tentative if it is a permanent address. 3857 * - otherwise, kill it. 3858 */ 3859 in6_ifa_hold(ifp); 3860 addrconf_dad_stop(ifp, 0); 3861 return; 3862 } 3863 3864 /* 3865 * Optimistic nodes can start receiving 3866 * Frames right away 3867 */ 3868 if (ifp->flags & IFA_F_OPTIMISTIC) { 3869 ip6_ins_rt(ifp->rt); 3870 if (ipv6_use_optimistic_addr(idev)) { 3871 /* Because optimistic nodes can use this address, 3872 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3873 */ 3874 notify = true; 3875 } 3876 } 3877 3878 addrconf_dad_kick(ifp); 3879 out: 3880 spin_unlock(&ifp->lock); 3881 read_unlock_bh(&idev->lock); 3882 if (notify) 3883 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3884 } 3885 3886 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3887 { 3888 bool begin_dad = false; 3889 3890 spin_lock_bh(&ifp->lock); 3891 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3892 ifp->state = INET6_IFADDR_STATE_PREDAD; 3893 begin_dad = true; 3894 } 3895 spin_unlock_bh(&ifp->lock); 3896 3897 if (begin_dad) 3898 addrconf_mod_dad_work(ifp, 0); 3899 } 3900 3901 static void addrconf_dad_work(struct work_struct *w) 3902 { 3903 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3904 struct inet6_ifaddr, 3905 dad_work); 3906 struct inet6_dev *idev = ifp->idev; 3907 bool bump_id, disable_ipv6 = false; 3908 struct in6_addr mcaddr; 3909 3910 enum { 3911 DAD_PROCESS, 3912 DAD_BEGIN, 3913 DAD_ABORT, 3914 } action = DAD_PROCESS; 3915 3916 rtnl_lock(); 3917 3918 spin_lock_bh(&ifp->lock); 3919 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3920 action = DAD_BEGIN; 3921 ifp->state = INET6_IFADDR_STATE_DAD; 3922 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3923 action = DAD_ABORT; 3924 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3925 3926 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3927 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3928 struct in6_addr addr; 3929 3930 addr.s6_addr32[0] = htonl(0xfe800000); 3931 addr.s6_addr32[1] = 0; 3932 3933 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3934 ipv6_addr_equal(&ifp->addr, &addr)) { 3935 /* DAD failed for link-local based on MAC */ 3936 idev->cnf.disable_ipv6 = 1; 3937 3938 pr_info("%s: IPv6 being disabled!\n", 3939 ifp->idev->dev->name); 3940 disable_ipv6 = true; 3941 } 3942 } 3943 } 3944 spin_unlock_bh(&ifp->lock); 3945 3946 if (action == DAD_BEGIN) { 3947 addrconf_dad_begin(ifp); 3948 goto out; 3949 } else if (action == DAD_ABORT) { 3950 in6_ifa_hold(ifp); 3951 addrconf_dad_stop(ifp, 1); 3952 if (disable_ipv6) 3953 addrconf_ifdown(idev->dev, 0); 3954 goto out; 3955 } 3956 3957 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3958 goto out; 3959 3960 write_lock_bh(&idev->lock); 3961 if (idev->dead || !(idev->if_flags & IF_READY)) { 3962 write_unlock_bh(&idev->lock); 3963 goto out; 3964 } 3965 3966 spin_lock(&ifp->lock); 3967 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3968 spin_unlock(&ifp->lock); 3969 write_unlock_bh(&idev->lock); 3970 goto out; 3971 } 3972 3973 if (ifp->dad_probes == 0) { 3974 /* 3975 * DAD was successful 3976 */ 3977 3978 bump_id = ifp->flags & IFA_F_TENTATIVE; 3979 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3980 spin_unlock(&ifp->lock); 3981 write_unlock_bh(&idev->lock); 3982 3983 addrconf_dad_completed(ifp, bump_id); 3984 3985 goto out; 3986 } 3987 3988 ifp->dad_probes--; 3989 addrconf_mod_dad_work(ifp, 3990 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3991 spin_unlock(&ifp->lock); 3992 write_unlock_bh(&idev->lock); 3993 3994 /* send a neighbour solicitation for our addr */ 3995 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3996 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3997 ifp->dad_nonce); 3998 out: 3999 in6_ifa_put(ifp); 4000 rtnl_unlock(); 4001 } 4002 4003 /* ifp->idev must be at least read locked */ 4004 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4005 { 4006 struct inet6_ifaddr *ifpiter; 4007 struct inet6_dev *idev = ifp->idev; 4008 4009 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4010 if (ifpiter->scope > IFA_LINK) 4011 break; 4012 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4013 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4014 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4015 IFA_F_PERMANENT) 4016 return false; 4017 } 4018 return true; 4019 } 4020 4021 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 4022 { 4023 struct net_device *dev = ifp->idev->dev; 4024 struct in6_addr lladdr; 4025 bool send_rs, send_mld; 4026 4027 addrconf_del_dad_work(ifp); 4028 4029 /* 4030 * Configure the address for reception. Now it is valid. 4031 */ 4032 4033 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4034 4035 /* If added prefix is link local and we are prepared to process 4036 router advertisements, start sending router solicitations. 4037 */ 4038 4039 read_lock_bh(&ifp->idev->lock); 4040 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4041 send_rs = send_mld && 4042 ipv6_accept_ra(ifp->idev) && 4043 ifp->idev->cnf.rtr_solicits != 0 && 4044 (dev->flags&IFF_LOOPBACK) == 0; 4045 read_unlock_bh(&ifp->idev->lock); 4046 4047 /* While dad is in progress mld report's source address is in6_addrany. 4048 * Resend with proper ll now. 4049 */ 4050 if (send_mld) 4051 ipv6_mc_dad_complete(ifp->idev); 4052 4053 if (send_rs) { 4054 /* 4055 * If a host as already performed a random delay 4056 * [...] as part of DAD [...] there is no need 4057 * to delay again before sending the first RS 4058 */ 4059 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4060 return; 4061 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4062 4063 write_lock_bh(&ifp->idev->lock); 4064 spin_lock(&ifp->lock); 4065 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4066 ifp->idev->cnf.rtr_solicit_interval); 4067 ifp->idev->rs_probes = 1; 4068 ifp->idev->if_flags |= IF_RS_SENT; 4069 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4070 spin_unlock(&ifp->lock); 4071 write_unlock_bh(&ifp->idev->lock); 4072 } 4073 4074 if (bump_id) 4075 rt_genid_bump_ipv6(dev_net(dev)); 4076 4077 /* Make sure that a new temporary address will be created 4078 * before this temporary address becomes deprecated. 4079 */ 4080 if (ifp->flags & IFA_F_TEMPORARY) 4081 addrconf_verify_rtnl(); 4082 } 4083 4084 static void addrconf_dad_run(struct inet6_dev *idev) 4085 { 4086 struct inet6_ifaddr *ifp; 4087 4088 read_lock_bh(&idev->lock); 4089 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4090 spin_lock(&ifp->lock); 4091 if (ifp->flags & IFA_F_TENTATIVE && 4092 ifp->state == INET6_IFADDR_STATE_DAD) 4093 addrconf_dad_kick(ifp); 4094 spin_unlock(&ifp->lock); 4095 } 4096 read_unlock_bh(&idev->lock); 4097 } 4098 4099 #ifdef CONFIG_PROC_FS 4100 struct if6_iter_state { 4101 struct seq_net_private p; 4102 int bucket; 4103 int offset; 4104 }; 4105 4106 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4107 { 4108 struct inet6_ifaddr *ifa = NULL; 4109 struct if6_iter_state *state = seq->private; 4110 struct net *net = seq_file_net(seq); 4111 int p = 0; 4112 4113 /* initial bucket if pos is 0 */ 4114 if (pos == 0) { 4115 state->bucket = 0; 4116 state->offset = 0; 4117 } 4118 4119 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4120 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4121 addr_lst) { 4122 if (!net_eq(dev_net(ifa->idev->dev), net)) 4123 continue; 4124 /* sync with offset */ 4125 if (p < state->offset) { 4126 p++; 4127 continue; 4128 } 4129 state->offset++; 4130 return ifa; 4131 } 4132 4133 /* prepare for next bucket */ 4134 state->offset = 0; 4135 p = 0; 4136 } 4137 return NULL; 4138 } 4139 4140 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4141 struct inet6_ifaddr *ifa) 4142 { 4143 struct if6_iter_state *state = seq->private; 4144 struct net *net = seq_file_net(seq); 4145 4146 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4147 if (!net_eq(dev_net(ifa->idev->dev), net)) 4148 continue; 4149 state->offset++; 4150 return ifa; 4151 } 4152 4153 while (++state->bucket < IN6_ADDR_HSIZE) { 4154 state->offset = 0; 4155 hlist_for_each_entry_rcu_bh(ifa, 4156 &inet6_addr_lst[state->bucket], addr_lst) { 4157 if (!net_eq(dev_net(ifa->idev->dev), net)) 4158 continue; 4159 state->offset++; 4160 return ifa; 4161 } 4162 } 4163 4164 return NULL; 4165 } 4166 4167 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4168 __acquires(rcu_bh) 4169 { 4170 rcu_read_lock_bh(); 4171 return if6_get_first(seq, *pos); 4172 } 4173 4174 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4175 { 4176 struct inet6_ifaddr *ifa; 4177 4178 ifa = if6_get_next(seq, v); 4179 ++*pos; 4180 return ifa; 4181 } 4182 4183 static void if6_seq_stop(struct seq_file *seq, void *v) 4184 __releases(rcu_bh) 4185 { 4186 rcu_read_unlock_bh(); 4187 } 4188 4189 static int if6_seq_show(struct seq_file *seq, void *v) 4190 { 4191 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4192 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4193 &ifp->addr, 4194 ifp->idev->dev->ifindex, 4195 ifp->prefix_len, 4196 ifp->scope, 4197 (u8) ifp->flags, 4198 ifp->idev->dev->name); 4199 return 0; 4200 } 4201 4202 static const struct seq_operations if6_seq_ops = { 4203 .start = if6_seq_start, 4204 .next = if6_seq_next, 4205 .show = if6_seq_show, 4206 .stop = if6_seq_stop, 4207 }; 4208 4209 static int if6_seq_open(struct inode *inode, struct file *file) 4210 { 4211 return seq_open_net(inode, file, &if6_seq_ops, 4212 sizeof(struct if6_iter_state)); 4213 } 4214 4215 static const struct file_operations if6_fops = { 4216 .owner = THIS_MODULE, 4217 .open = if6_seq_open, 4218 .read = seq_read, 4219 .llseek = seq_lseek, 4220 .release = seq_release_net, 4221 }; 4222 4223 static int __net_init if6_proc_net_init(struct net *net) 4224 { 4225 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4226 return -ENOMEM; 4227 return 0; 4228 } 4229 4230 static void __net_exit if6_proc_net_exit(struct net *net) 4231 { 4232 remove_proc_entry("if_inet6", net->proc_net); 4233 } 4234 4235 static struct pernet_operations if6_proc_net_ops = { 4236 .init = if6_proc_net_init, 4237 .exit = if6_proc_net_exit, 4238 }; 4239 4240 int __init if6_proc_init(void) 4241 { 4242 return register_pernet_subsys(&if6_proc_net_ops); 4243 } 4244 4245 void if6_proc_exit(void) 4246 { 4247 unregister_pernet_subsys(&if6_proc_net_ops); 4248 } 4249 #endif /* CONFIG_PROC_FS */ 4250 4251 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4252 /* Check if address is a home address configured on any interface. */ 4253 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4254 { 4255 int ret = 0; 4256 struct inet6_ifaddr *ifp = NULL; 4257 unsigned int hash = inet6_addr_hash(addr); 4258 4259 rcu_read_lock_bh(); 4260 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4261 if (!net_eq(dev_net(ifp->idev->dev), net)) 4262 continue; 4263 if (ipv6_addr_equal(&ifp->addr, addr) && 4264 (ifp->flags & IFA_F_HOMEADDRESS)) { 4265 ret = 1; 4266 break; 4267 } 4268 } 4269 rcu_read_unlock_bh(); 4270 return ret; 4271 } 4272 #endif 4273 4274 /* 4275 * Periodic address status verification 4276 */ 4277 4278 static void addrconf_verify_rtnl(void) 4279 { 4280 unsigned long now, next, next_sec, next_sched; 4281 struct inet6_ifaddr *ifp; 4282 int i; 4283 4284 ASSERT_RTNL(); 4285 4286 rcu_read_lock_bh(); 4287 now = jiffies; 4288 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4289 4290 cancel_delayed_work(&addr_chk_work); 4291 4292 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4293 restart: 4294 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4295 unsigned long age; 4296 4297 /* When setting preferred_lft to a value not zero or 4298 * infinity, while valid_lft is infinity 4299 * IFA_F_PERMANENT has a non-infinity life time. 4300 */ 4301 if ((ifp->flags & IFA_F_PERMANENT) && 4302 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4303 continue; 4304 4305 spin_lock(&ifp->lock); 4306 /* We try to batch several events at once. */ 4307 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4308 4309 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4310 age >= ifp->valid_lft) { 4311 spin_unlock(&ifp->lock); 4312 in6_ifa_hold(ifp); 4313 ipv6_del_addr(ifp); 4314 goto restart; 4315 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4316 spin_unlock(&ifp->lock); 4317 continue; 4318 } else if (age >= ifp->prefered_lft) { 4319 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4320 int deprecate = 0; 4321 4322 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4323 deprecate = 1; 4324 ifp->flags |= IFA_F_DEPRECATED; 4325 } 4326 4327 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4328 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4329 next = ifp->tstamp + ifp->valid_lft * HZ; 4330 4331 spin_unlock(&ifp->lock); 4332 4333 if (deprecate) { 4334 in6_ifa_hold(ifp); 4335 4336 ipv6_ifa_notify(0, ifp); 4337 in6_ifa_put(ifp); 4338 goto restart; 4339 } 4340 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4341 !(ifp->flags&IFA_F_TENTATIVE)) { 4342 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4343 ifp->idev->cnf.dad_transmits * 4344 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4345 4346 if (age >= ifp->prefered_lft - regen_advance) { 4347 struct inet6_ifaddr *ifpub = ifp->ifpub; 4348 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4349 next = ifp->tstamp + ifp->prefered_lft * HZ; 4350 if (!ifp->regen_count && ifpub) { 4351 ifp->regen_count++; 4352 in6_ifa_hold(ifp); 4353 in6_ifa_hold(ifpub); 4354 spin_unlock(&ifp->lock); 4355 4356 spin_lock(&ifpub->lock); 4357 ifpub->regen_count = 0; 4358 spin_unlock(&ifpub->lock); 4359 ipv6_create_tempaddr(ifpub, ifp); 4360 in6_ifa_put(ifpub); 4361 in6_ifa_put(ifp); 4362 goto restart; 4363 } 4364 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4365 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4366 spin_unlock(&ifp->lock); 4367 } else { 4368 /* ifp->prefered_lft <= ifp->valid_lft */ 4369 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4370 next = ifp->tstamp + ifp->prefered_lft * HZ; 4371 spin_unlock(&ifp->lock); 4372 } 4373 } 4374 } 4375 4376 next_sec = round_jiffies_up(next); 4377 next_sched = next; 4378 4379 /* If rounded timeout is accurate enough, accept it. */ 4380 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4381 next_sched = next_sec; 4382 4383 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4384 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4385 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4386 4387 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4388 now, next, next_sec, next_sched); 4389 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4390 rcu_read_unlock_bh(); 4391 } 4392 4393 static void addrconf_verify_work(struct work_struct *w) 4394 { 4395 rtnl_lock(); 4396 addrconf_verify_rtnl(); 4397 rtnl_unlock(); 4398 } 4399 4400 static void addrconf_verify(void) 4401 { 4402 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4403 } 4404 4405 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4406 struct in6_addr **peer_pfx) 4407 { 4408 struct in6_addr *pfx = NULL; 4409 4410 *peer_pfx = NULL; 4411 4412 if (addr) 4413 pfx = nla_data(addr); 4414 4415 if (local) { 4416 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4417 *peer_pfx = pfx; 4418 pfx = nla_data(local); 4419 } 4420 4421 return pfx; 4422 } 4423 4424 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4425 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4426 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4427 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4428 [IFA_FLAGS] = { .len = sizeof(u32) }, 4429 }; 4430 4431 static int 4432 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4433 struct netlink_ext_ack *extack) 4434 { 4435 struct net *net = sock_net(skb->sk); 4436 struct ifaddrmsg *ifm; 4437 struct nlattr *tb[IFA_MAX+1]; 4438 struct in6_addr *pfx, *peer_pfx; 4439 u32 ifa_flags; 4440 int err; 4441 4442 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4443 extack); 4444 if (err < 0) 4445 return err; 4446 4447 ifm = nlmsg_data(nlh); 4448 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4449 if (!pfx) 4450 return -EINVAL; 4451 4452 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4453 4454 /* We ignore other flags so far. */ 4455 ifa_flags &= IFA_F_MANAGETEMPADDR; 4456 4457 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4458 ifm->ifa_prefixlen); 4459 } 4460 4461 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4462 u32 prefered_lft, u32 valid_lft) 4463 { 4464 u32 flags; 4465 clock_t expires; 4466 unsigned long timeout; 4467 bool was_managetempaddr; 4468 bool had_prefixroute; 4469 4470 ASSERT_RTNL(); 4471 4472 if (!valid_lft || (prefered_lft > valid_lft)) 4473 return -EINVAL; 4474 4475 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4476 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4477 return -EINVAL; 4478 4479 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4480 if (addrconf_finite_timeout(timeout)) { 4481 expires = jiffies_to_clock_t(timeout * HZ); 4482 valid_lft = timeout; 4483 flags = RTF_EXPIRES; 4484 } else { 4485 expires = 0; 4486 flags = 0; 4487 ifa_flags |= IFA_F_PERMANENT; 4488 } 4489 4490 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4491 if (addrconf_finite_timeout(timeout)) { 4492 if (timeout == 0) 4493 ifa_flags |= IFA_F_DEPRECATED; 4494 prefered_lft = timeout; 4495 } 4496 4497 spin_lock_bh(&ifp->lock); 4498 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4499 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4500 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4501 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4502 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4503 IFA_F_NOPREFIXROUTE); 4504 ifp->flags |= ifa_flags; 4505 ifp->tstamp = jiffies; 4506 ifp->valid_lft = valid_lft; 4507 ifp->prefered_lft = prefered_lft; 4508 4509 spin_unlock_bh(&ifp->lock); 4510 if (!(ifp->flags&IFA_F_TENTATIVE)) 4511 ipv6_ifa_notify(0, ifp); 4512 4513 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4514 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4515 expires, flags); 4516 } else if (had_prefixroute) { 4517 enum cleanup_prefix_rt_t action; 4518 unsigned long rt_expires; 4519 4520 write_lock_bh(&ifp->idev->lock); 4521 action = check_cleanup_prefix_route(ifp, &rt_expires); 4522 write_unlock_bh(&ifp->idev->lock); 4523 4524 if (action != CLEANUP_PREFIX_RT_NOP) { 4525 cleanup_prefix_route(ifp, rt_expires, 4526 action == CLEANUP_PREFIX_RT_DEL); 4527 } 4528 } 4529 4530 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4531 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4532 valid_lft = prefered_lft = 0; 4533 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4534 !was_managetempaddr, jiffies); 4535 } 4536 4537 addrconf_verify_rtnl(); 4538 4539 return 0; 4540 } 4541 4542 static int 4543 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4544 struct netlink_ext_ack *extack) 4545 { 4546 struct net *net = sock_net(skb->sk); 4547 struct ifaddrmsg *ifm; 4548 struct nlattr *tb[IFA_MAX+1]; 4549 struct in6_addr *pfx, *peer_pfx; 4550 struct inet6_ifaddr *ifa; 4551 struct net_device *dev; 4552 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4553 u32 ifa_flags; 4554 int err; 4555 4556 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4557 extack); 4558 if (err < 0) 4559 return err; 4560 4561 ifm = nlmsg_data(nlh); 4562 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4563 if (!pfx) 4564 return -EINVAL; 4565 4566 if (tb[IFA_CACHEINFO]) { 4567 struct ifa_cacheinfo *ci; 4568 4569 ci = nla_data(tb[IFA_CACHEINFO]); 4570 valid_lft = ci->ifa_valid; 4571 preferred_lft = ci->ifa_prefered; 4572 } else { 4573 preferred_lft = INFINITY_LIFE_TIME; 4574 valid_lft = INFINITY_LIFE_TIME; 4575 } 4576 4577 dev = __dev_get_by_index(net, ifm->ifa_index); 4578 if (!dev) 4579 return -ENODEV; 4580 4581 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4582 4583 /* We ignore other flags so far. */ 4584 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4585 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4586 4587 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4588 if (!ifa) { 4589 /* 4590 * It would be best to check for !NLM_F_CREATE here but 4591 * userspace already relies on not having to provide this. 4592 */ 4593 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4594 ifm->ifa_prefixlen, ifa_flags, 4595 preferred_lft, valid_lft); 4596 } 4597 4598 if (nlh->nlmsg_flags & NLM_F_EXCL || 4599 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4600 err = -EEXIST; 4601 else 4602 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4603 4604 in6_ifa_put(ifa); 4605 4606 return err; 4607 } 4608 4609 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4610 u8 scope, int ifindex) 4611 { 4612 struct ifaddrmsg *ifm; 4613 4614 ifm = nlmsg_data(nlh); 4615 ifm->ifa_family = AF_INET6; 4616 ifm->ifa_prefixlen = prefixlen; 4617 ifm->ifa_flags = flags; 4618 ifm->ifa_scope = scope; 4619 ifm->ifa_index = ifindex; 4620 } 4621 4622 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4623 unsigned long tstamp, u32 preferred, u32 valid) 4624 { 4625 struct ifa_cacheinfo ci; 4626 4627 ci.cstamp = cstamp_delta(cstamp); 4628 ci.tstamp = cstamp_delta(tstamp); 4629 ci.ifa_prefered = preferred; 4630 ci.ifa_valid = valid; 4631 4632 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4633 } 4634 4635 static inline int rt_scope(int ifa_scope) 4636 { 4637 if (ifa_scope & IFA_HOST) 4638 return RT_SCOPE_HOST; 4639 else if (ifa_scope & IFA_LINK) 4640 return RT_SCOPE_LINK; 4641 else if (ifa_scope & IFA_SITE) 4642 return RT_SCOPE_SITE; 4643 else 4644 return RT_SCOPE_UNIVERSE; 4645 } 4646 4647 static inline int inet6_ifaddr_msgsize(void) 4648 { 4649 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4650 + nla_total_size(16) /* IFA_LOCAL */ 4651 + nla_total_size(16) /* IFA_ADDRESS */ 4652 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4653 + nla_total_size(4) /* IFA_FLAGS */; 4654 } 4655 4656 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4657 u32 portid, u32 seq, int event, unsigned int flags) 4658 { 4659 struct nlmsghdr *nlh; 4660 u32 preferred, valid; 4661 4662 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4663 if (!nlh) 4664 return -EMSGSIZE; 4665 4666 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4667 ifa->idev->dev->ifindex); 4668 4669 if (!((ifa->flags&IFA_F_PERMANENT) && 4670 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4671 preferred = ifa->prefered_lft; 4672 valid = ifa->valid_lft; 4673 if (preferred != INFINITY_LIFE_TIME) { 4674 long tval = (jiffies - ifa->tstamp)/HZ; 4675 if (preferred > tval) 4676 preferred -= tval; 4677 else 4678 preferred = 0; 4679 if (valid != INFINITY_LIFE_TIME) { 4680 if (valid > tval) 4681 valid -= tval; 4682 else 4683 valid = 0; 4684 } 4685 } 4686 } else { 4687 preferred = INFINITY_LIFE_TIME; 4688 valid = INFINITY_LIFE_TIME; 4689 } 4690 4691 if (!ipv6_addr_any(&ifa->peer_addr)) { 4692 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4693 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4694 goto error; 4695 } else 4696 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4697 goto error; 4698 4699 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4700 goto error; 4701 4702 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4703 goto error; 4704 4705 nlmsg_end(skb, nlh); 4706 return 0; 4707 4708 error: 4709 nlmsg_cancel(skb, nlh); 4710 return -EMSGSIZE; 4711 } 4712 4713 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4714 u32 portid, u32 seq, int event, u16 flags) 4715 { 4716 struct nlmsghdr *nlh; 4717 u8 scope = RT_SCOPE_UNIVERSE; 4718 int ifindex = ifmca->idev->dev->ifindex; 4719 4720 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4721 scope = RT_SCOPE_SITE; 4722 4723 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4724 if (!nlh) 4725 return -EMSGSIZE; 4726 4727 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4728 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4729 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4730 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4731 nlmsg_cancel(skb, nlh); 4732 return -EMSGSIZE; 4733 } 4734 4735 nlmsg_end(skb, nlh); 4736 return 0; 4737 } 4738 4739 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4740 u32 portid, u32 seq, int event, unsigned int flags) 4741 { 4742 struct nlmsghdr *nlh; 4743 u8 scope = RT_SCOPE_UNIVERSE; 4744 int ifindex = ifaca->aca_idev->dev->ifindex; 4745 4746 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4747 scope = RT_SCOPE_SITE; 4748 4749 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4750 if (!nlh) 4751 return -EMSGSIZE; 4752 4753 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4754 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4755 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4756 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4757 nlmsg_cancel(skb, nlh); 4758 return -EMSGSIZE; 4759 } 4760 4761 nlmsg_end(skb, nlh); 4762 return 0; 4763 } 4764 4765 enum addr_type_t { 4766 UNICAST_ADDR, 4767 MULTICAST_ADDR, 4768 ANYCAST_ADDR, 4769 }; 4770 4771 /* called with rcu_read_lock() */ 4772 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4773 struct netlink_callback *cb, enum addr_type_t type, 4774 int s_ip_idx, int *p_ip_idx) 4775 { 4776 struct ifmcaddr6 *ifmca; 4777 struct ifacaddr6 *ifaca; 4778 int err = 1; 4779 int ip_idx = *p_ip_idx; 4780 4781 read_lock_bh(&idev->lock); 4782 switch (type) { 4783 case UNICAST_ADDR: { 4784 struct inet6_ifaddr *ifa; 4785 4786 /* unicast address incl. temp addr */ 4787 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4788 if (++ip_idx < s_ip_idx) 4789 continue; 4790 err = inet6_fill_ifaddr(skb, ifa, 4791 NETLINK_CB(cb->skb).portid, 4792 cb->nlh->nlmsg_seq, 4793 RTM_NEWADDR, 4794 NLM_F_MULTI); 4795 if (err < 0) 4796 break; 4797 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4798 } 4799 break; 4800 } 4801 case MULTICAST_ADDR: 4802 /* multicast address */ 4803 for (ifmca = idev->mc_list; ifmca; 4804 ifmca = ifmca->next, ip_idx++) { 4805 if (ip_idx < s_ip_idx) 4806 continue; 4807 err = inet6_fill_ifmcaddr(skb, ifmca, 4808 NETLINK_CB(cb->skb).portid, 4809 cb->nlh->nlmsg_seq, 4810 RTM_GETMULTICAST, 4811 NLM_F_MULTI); 4812 if (err < 0) 4813 break; 4814 } 4815 break; 4816 case ANYCAST_ADDR: 4817 /* anycast address */ 4818 for (ifaca = idev->ac_list; ifaca; 4819 ifaca = ifaca->aca_next, ip_idx++) { 4820 if (ip_idx < s_ip_idx) 4821 continue; 4822 err = inet6_fill_ifacaddr(skb, ifaca, 4823 NETLINK_CB(cb->skb).portid, 4824 cb->nlh->nlmsg_seq, 4825 RTM_GETANYCAST, 4826 NLM_F_MULTI); 4827 if (err < 0) 4828 break; 4829 } 4830 break; 4831 default: 4832 break; 4833 } 4834 read_unlock_bh(&idev->lock); 4835 *p_ip_idx = ip_idx; 4836 return err; 4837 } 4838 4839 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4840 enum addr_type_t type) 4841 { 4842 struct net *net = sock_net(skb->sk); 4843 int h, s_h; 4844 int idx, ip_idx; 4845 int s_idx, s_ip_idx; 4846 struct net_device *dev; 4847 struct inet6_dev *idev; 4848 struct hlist_head *head; 4849 4850 s_h = cb->args[0]; 4851 s_idx = idx = cb->args[1]; 4852 s_ip_idx = ip_idx = cb->args[2]; 4853 4854 rcu_read_lock(); 4855 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4856 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4857 idx = 0; 4858 head = &net->dev_index_head[h]; 4859 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4860 if (idx < s_idx) 4861 goto cont; 4862 if (h > s_h || idx > s_idx) 4863 s_ip_idx = 0; 4864 ip_idx = 0; 4865 idev = __in6_dev_get(dev); 4866 if (!idev) 4867 goto cont; 4868 4869 if (in6_dump_addrs(idev, skb, cb, type, 4870 s_ip_idx, &ip_idx) < 0) 4871 goto done; 4872 cont: 4873 idx++; 4874 } 4875 } 4876 done: 4877 rcu_read_unlock(); 4878 cb->args[0] = h; 4879 cb->args[1] = idx; 4880 cb->args[2] = ip_idx; 4881 4882 return skb->len; 4883 } 4884 4885 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4886 { 4887 enum addr_type_t type = UNICAST_ADDR; 4888 4889 return inet6_dump_addr(skb, cb, type); 4890 } 4891 4892 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4893 { 4894 enum addr_type_t type = MULTICAST_ADDR; 4895 4896 return inet6_dump_addr(skb, cb, type); 4897 } 4898 4899 4900 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4901 { 4902 enum addr_type_t type = ANYCAST_ADDR; 4903 4904 return inet6_dump_addr(skb, cb, type); 4905 } 4906 4907 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4908 struct netlink_ext_ack *extack) 4909 { 4910 struct net *net = sock_net(in_skb->sk); 4911 struct ifaddrmsg *ifm; 4912 struct nlattr *tb[IFA_MAX+1]; 4913 struct in6_addr *addr = NULL, *peer; 4914 struct net_device *dev = NULL; 4915 struct inet6_ifaddr *ifa; 4916 struct sk_buff *skb; 4917 int err; 4918 4919 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4920 extack); 4921 if (err < 0) 4922 goto errout; 4923 4924 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4925 if (!addr) { 4926 err = -EINVAL; 4927 goto errout; 4928 } 4929 4930 ifm = nlmsg_data(nlh); 4931 if (ifm->ifa_index) 4932 dev = __dev_get_by_index(net, ifm->ifa_index); 4933 4934 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4935 if (!ifa) { 4936 err = -EADDRNOTAVAIL; 4937 goto errout; 4938 } 4939 4940 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4941 if (!skb) { 4942 err = -ENOBUFS; 4943 goto errout_ifa; 4944 } 4945 4946 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4947 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4948 if (err < 0) { 4949 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4950 WARN_ON(err == -EMSGSIZE); 4951 kfree_skb(skb); 4952 goto errout_ifa; 4953 } 4954 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4955 errout_ifa: 4956 in6_ifa_put(ifa); 4957 errout: 4958 return err; 4959 } 4960 4961 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4962 { 4963 struct sk_buff *skb; 4964 struct net *net = dev_net(ifa->idev->dev); 4965 int err = -ENOBUFS; 4966 4967 /* Don't send DELADDR notification for TENTATIVE address, 4968 * since NEWADDR notification is sent only after removing 4969 * TENTATIVE flag. 4970 */ 4971 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4972 return; 4973 4974 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4975 if (!skb) 4976 goto errout; 4977 4978 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4979 if (err < 0) { 4980 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4981 WARN_ON(err == -EMSGSIZE); 4982 kfree_skb(skb); 4983 goto errout; 4984 } 4985 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4986 return; 4987 errout: 4988 if (err < 0) 4989 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4990 } 4991 4992 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4993 __s32 *array, int bytes) 4994 { 4995 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4996 4997 memset(array, 0, bytes); 4998 array[DEVCONF_FORWARDING] = cnf->forwarding; 4999 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5000 array[DEVCONF_MTU6] = cnf->mtu6; 5001 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5002 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5003 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5004 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5005 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5006 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5007 jiffies_to_msecs(cnf->rtr_solicit_interval); 5008 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5009 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5010 array[DEVCONF_RTR_SOLICIT_DELAY] = 5011 jiffies_to_msecs(cnf->rtr_solicit_delay); 5012 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5013 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5014 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5015 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5016 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5017 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5018 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5019 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5020 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5021 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5022 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5023 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5024 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5025 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5026 #ifdef CONFIG_IPV6_ROUTER_PREF 5027 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5028 array[DEVCONF_RTR_PROBE_INTERVAL] = 5029 jiffies_to_msecs(cnf->rtr_probe_interval); 5030 #ifdef CONFIG_IPV6_ROUTE_INFO 5031 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5032 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5033 #endif 5034 #endif 5035 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5036 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5037 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5038 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5039 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5040 #endif 5041 #ifdef CONFIG_IPV6_MROUTE 5042 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5043 #endif 5044 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5045 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5046 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5047 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5048 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5049 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5050 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5051 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5052 /* we omit DEVCONF_STABLE_SECRET for now */ 5053 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5054 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5055 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5056 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5057 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5058 #ifdef CONFIG_IPV6_SEG6_HMAC 5059 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5060 #endif 5061 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5062 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5063 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5064 } 5065 5066 static inline size_t inet6_ifla6_size(void) 5067 { 5068 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5069 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5070 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5071 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5072 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5073 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5074 } 5075 5076 static inline size_t inet6_if_nlmsg_size(void) 5077 { 5078 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5079 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5080 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5081 + nla_total_size(4) /* IFLA_MTU */ 5082 + nla_total_size(4) /* IFLA_LINK */ 5083 + nla_total_size(1) /* IFLA_OPERSTATE */ 5084 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5085 } 5086 5087 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5088 int bytes) 5089 { 5090 int i; 5091 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5092 BUG_ON(pad < 0); 5093 5094 /* Use put_unaligned() because stats may not be aligned for u64. */ 5095 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5096 for (i = 1; i < ICMP6_MIB_MAX; i++) 5097 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5098 5099 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5100 } 5101 5102 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5103 int bytes, size_t syncpoff) 5104 { 5105 int i, c; 5106 u64 buff[IPSTATS_MIB_MAX]; 5107 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5108 5109 BUG_ON(pad < 0); 5110 5111 memset(buff, 0, sizeof(buff)); 5112 buff[0] = IPSTATS_MIB_MAX; 5113 5114 for_each_possible_cpu(c) { 5115 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5116 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5117 } 5118 5119 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5120 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5121 } 5122 5123 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5124 int bytes) 5125 { 5126 switch (attrtype) { 5127 case IFLA_INET6_STATS: 5128 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5129 offsetof(struct ipstats_mib, syncp)); 5130 break; 5131 case IFLA_INET6_ICMP6STATS: 5132 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5133 break; 5134 } 5135 } 5136 5137 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5138 u32 ext_filter_mask) 5139 { 5140 struct nlattr *nla; 5141 struct ifla_cacheinfo ci; 5142 5143 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5144 goto nla_put_failure; 5145 ci.max_reasm_len = IPV6_MAXPLEN; 5146 ci.tstamp = cstamp_delta(idev->tstamp); 5147 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5148 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5149 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5150 goto nla_put_failure; 5151 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5152 if (!nla) 5153 goto nla_put_failure; 5154 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5155 5156 /* XXX - MC not implemented */ 5157 5158 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5159 return 0; 5160 5161 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5162 if (!nla) 5163 goto nla_put_failure; 5164 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5165 5166 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5167 if (!nla) 5168 goto nla_put_failure; 5169 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5170 5171 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5172 if (!nla) 5173 goto nla_put_failure; 5174 5175 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5176 goto nla_put_failure; 5177 5178 read_lock_bh(&idev->lock); 5179 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5180 read_unlock_bh(&idev->lock); 5181 5182 return 0; 5183 5184 nla_put_failure: 5185 return -EMSGSIZE; 5186 } 5187 5188 static size_t inet6_get_link_af_size(const struct net_device *dev, 5189 u32 ext_filter_mask) 5190 { 5191 if (!__in6_dev_get(dev)) 5192 return 0; 5193 5194 return inet6_ifla6_size(); 5195 } 5196 5197 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5198 u32 ext_filter_mask) 5199 { 5200 struct inet6_dev *idev = __in6_dev_get(dev); 5201 5202 if (!idev) 5203 return -ENODATA; 5204 5205 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5206 return -EMSGSIZE; 5207 5208 return 0; 5209 } 5210 5211 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5212 { 5213 struct inet6_ifaddr *ifp; 5214 struct net_device *dev = idev->dev; 5215 bool clear_token, update_rs = false; 5216 struct in6_addr ll_addr; 5217 5218 ASSERT_RTNL(); 5219 5220 if (!token) 5221 return -EINVAL; 5222 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5223 return -EINVAL; 5224 if (!ipv6_accept_ra(idev)) 5225 return -EINVAL; 5226 if (idev->cnf.rtr_solicits == 0) 5227 return -EINVAL; 5228 5229 write_lock_bh(&idev->lock); 5230 5231 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5232 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5233 5234 write_unlock_bh(&idev->lock); 5235 5236 clear_token = ipv6_addr_any(token); 5237 if (clear_token) 5238 goto update_lft; 5239 5240 if (!idev->dead && (idev->if_flags & IF_READY) && 5241 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5242 IFA_F_OPTIMISTIC)) { 5243 /* If we're not ready, then normal ifup will take care 5244 * of this. Otherwise, we need to request our rs here. 5245 */ 5246 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5247 update_rs = true; 5248 } 5249 5250 update_lft: 5251 write_lock_bh(&idev->lock); 5252 5253 if (update_rs) { 5254 idev->if_flags |= IF_RS_SENT; 5255 idev->rs_interval = rfc3315_s14_backoff_init( 5256 idev->cnf.rtr_solicit_interval); 5257 idev->rs_probes = 1; 5258 addrconf_mod_rs_timer(idev, idev->rs_interval); 5259 } 5260 5261 /* Well, that's kinda nasty ... */ 5262 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5263 spin_lock(&ifp->lock); 5264 if (ifp->tokenized) { 5265 ifp->valid_lft = 0; 5266 ifp->prefered_lft = 0; 5267 } 5268 spin_unlock(&ifp->lock); 5269 } 5270 5271 write_unlock_bh(&idev->lock); 5272 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5273 addrconf_verify_rtnl(); 5274 return 0; 5275 } 5276 5277 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5278 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5279 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5280 }; 5281 5282 static int inet6_validate_link_af(const struct net_device *dev, 5283 const struct nlattr *nla) 5284 { 5285 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5286 5287 if (dev && !__in6_dev_get(dev)) 5288 return -EAFNOSUPPORT; 5289 5290 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5291 NULL); 5292 } 5293 5294 static int check_addr_gen_mode(int mode) 5295 { 5296 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5297 mode != IN6_ADDR_GEN_MODE_NONE && 5298 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5299 mode != IN6_ADDR_GEN_MODE_RANDOM) 5300 return -EINVAL; 5301 return 1; 5302 } 5303 5304 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5305 int mode) 5306 { 5307 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5308 !idev->cnf.stable_secret.initialized && 5309 !net->ipv6.devconf_dflt->stable_secret.initialized) 5310 return -EINVAL; 5311 return 1; 5312 } 5313 5314 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5315 { 5316 int err = -EINVAL; 5317 struct inet6_dev *idev = __in6_dev_get(dev); 5318 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5319 5320 if (!idev) 5321 return -EAFNOSUPPORT; 5322 5323 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5324 BUG(); 5325 5326 if (tb[IFLA_INET6_TOKEN]) { 5327 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5328 if (err) 5329 return err; 5330 } 5331 5332 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5333 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5334 5335 if (check_addr_gen_mode(mode) < 0 || 5336 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5337 return -EINVAL; 5338 5339 idev->cnf.addr_gen_mode = mode; 5340 err = 0; 5341 } 5342 5343 return err; 5344 } 5345 5346 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5347 u32 portid, u32 seq, int event, unsigned int flags) 5348 { 5349 struct net_device *dev = idev->dev; 5350 struct ifinfomsg *hdr; 5351 struct nlmsghdr *nlh; 5352 void *protoinfo; 5353 5354 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5355 if (!nlh) 5356 return -EMSGSIZE; 5357 5358 hdr = nlmsg_data(nlh); 5359 hdr->ifi_family = AF_INET6; 5360 hdr->__ifi_pad = 0; 5361 hdr->ifi_type = dev->type; 5362 hdr->ifi_index = dev->ifindex; 5363 hdr->ifi_flags = dev_get_flags(dev); 5364 hdr->ifi_change = 0; 5365 5366 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5367 (dev->addr_len && 5368 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5369 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5370 (dev->ifindex != dev_get_iflink(dev) && 5371 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5372 nla_put_u8(skb, IFLA_OPERSTATE, 5373 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5374 goto nla_put_failure; 5375 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5376 if (!protoinfo) 5377 goto nla_put_failure; 5378 5379 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5380 goto nla_put_failure; 5381 5382 nla_nest_end(skb, protoinfo); 5383 nlmsg_end(skb, nlh); 5384 return 0; 5385 5386 nla_put_failure: 5387 nlmsg_cancel(skb, nlh); 5388 return -EMSGSIZE; 5389 } 5390 5391 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5392 { 5393 struct net *net = sock_net(skb->sk); 5394 int h, s_h; 5395 int idx = 0, s_idx; 5396 struct net_device *dev; 5397 struct inet6_dev *idev; 5398 struct hlist_head *head; 5399 5400 s_h = cb->args[0]; 5401 s_idx = cb->args[1]; 5402 5403 rcu_read_lock(); 5404 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5405 idx = 0; 5406 head = &net->dev_index_head[h]; 5407 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5408 if (idx < s_idx) 5409 goto cont; 5410 idev = __in6_dev_get(dev); 5411 if (!idev) 5412 goto cont; 5413 if (inet6_fill_ifinfo(skb, idev, 5414 NETLINK_CB(cb->skb).portid, 5415 cb->nlh->nlmsg_seq, 5416 RTM_NEWLINK, NLM_F_MULTI) < 0) 5417 goto out; 5418 cont: 5419 idx++; 5420 } 5421 } 5422 out: 5423 rcu_read_unlock(); 5424 cb->args[1] = idx; 5425 cb->args[0] = h; 5426 5427 return skb->len; 5428 } 5429 5430 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5431 { 5432 struct sk_buff *skb; 5433 struct net *net = dev_net(idev->dev); 5434 int err = -ENOBUFS; 5435 5436 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5437 if (!skb) 5438 goto errout; 5439 5440 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5441 if (err < 0) { 5442 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5443 WARN_ON(err == -EMSGSIZE); 5444 kfree_skb(skb); 5445 goto errout; 5446 } 5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5448 return; 5449 errout: 5450 if (err < 0) 5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5452 } 5453 5454 static inline size_t inet6_prefix_nlmsg_size(void) 5455 { 5456 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5457 + nla_total_size(sizeof(struct in6_addr)) 5458 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5459 } 5460 5461 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5462 struct prefix_info *pinfo, u32 portid, u32 seq, 5463 int event, unsigned int flags) 5464 { 5465 struct prefixmsg *pmsg; 5466 struct nlmsghdr *nlh; 5467 struct prefix_cacheinfo ci; 5468 5469 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5470 if (!nlh) 5471 return -EMSGSIZE; 5472 5473 pmsg = nlmsg_data(nlh); 5474 pmsg->prefix_family = AF_INET6; 5475 pmsg->prefix_pad1 = 0; 5476 pmsg->prefix_pad2 = 0; 5477 pmsg->prefix_ifindex = idev->dev->ifindex; 5478 pmsg->prefix_len = pinfo->prefix_len; 5479 pmsg->prefix_type = pinfo->type; 5480 pmsg->prefix_pad3 = 0; 5481 pmsg->prefix_flags = 0; 5482 if (pinfo->onlink) 5483 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5484 if (pinfo->autoconf) 5485 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5486 5487 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5488 goto nla_put_failure; 5489 ci.preferred_time = ntohl(pinfo->prefered); 5490 ci.valid_time = ntohl(pinfo->valid); 5491 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5492 goto nla_put_failure; 5493 nlmsg_end(skb, nlh); 5494 return 0; 5495 5496 nla_put_failure: 5497 nlmsg_cancel(skb, nlh); 5498 return -EMSGSIZE; 5499 } 5500 5501 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5502 struct prefix_info *pinfo) 5503 { 5504 struct sk_buff *skb; 5505 struct net *net = dev_net(idev->dev); 5506 int err = -ENOBUFS; 5507 5508 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5509 if (!skb) 5510 goto errout; 5511 5512 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5513 if (err < 0) { 5514 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5515 WARN_ON(err == -EMSGSIZE); 5516 kfree_skb(skb); 5517 goto errout; 5518 } 5519 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5520 return; 5521 errout: 5522 if (err < 0) 5523 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5524 } 5525 5526 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5527 { 5528 struct net *net = dev_net(ifp->idev->dev); 5529 5530 if (event) 5531 ASSERT_RTNL(); 5532 5533 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5534 5535 switch (event) { 5536 case RTM_NEWADDR: 5537 /* 5538 * If the address was optimistic 5539 * we inserted the route at the start of 5540 * our DAD process, so we don't need 5541 * to do it again 5542 */ 5543 if (!(ifp->rt->rt6i_node)) 5544 ip6_ins_rt(ifp->rt); 5545 if (ifp->idev->cnf.forwarding) 5546 addrconf_join_anycast(ifp); 5547 if (!ipv6_addr_any(&ifp->peer_addr)) 5548 addrconf_prefix_route(&ifp->peer_addr, 128, 5549 ifp->idev->dev, 0, 0); 5550 break; 5551 case RTM_DELADDR: 5552 if (ifp->idev->cnf.forwarding) 5553 addrconf_leave_anycast(ifp); 5554 addrconf_leave_solict(ifp->idev, &ifp->addr); 5555 if (!ipv6_addr_any(&ifp->peer_addr)) { 5556 struct rt6_info *rt; 5557 5558 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5559 ifp->idev->dev, 0, 0); 5560 if (rt) 5561 ip6_del_rt(rt); 5562 } 5563 if (ifp->rt) { 5564 dst_hold(&ifp->rt->dst); 5565 ip6_del_rt(ifp->rt); 5566 } 5567 rt_genid_bump_ipv6(net); 5568 break; 5569 } 5570 atomic_inc(&net->ipv6.dev_addr_genid); 5571 } 5572 5573 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5574 { 5575 rcu_read_lock_bh(); 5576 if (likely(ifp->idev->dead == 0)) 5577 __ipv6_ifa_notify(event, ifp); 5578 rcu_read_unlock_bh(); 5579 } 5580 5581 #ifdef CONFIG_SYSCTL 5582 5583 static 5584 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5585 void __user *buffer, size_t *lenp, loff_t *ppos) 5586 { 5587 int *valp = ctl->data; 5588 int val = *valp; 5589 loff_t pos = *ppos; 5590 struct ctl_table lctl; 5591 int ret; 5592 5593 /* 5594 * ctl->data points to idev->cnf.forwarding, we should 5595 * not modify it until we get the rtnl lock. 5596 */ 5597 lctl = *ctl; 5598 lctl.data = &val; 5599 5600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5601 5602 if (write) 5603 ret = addrconf_fixup_forwarding(ctl, valp, val); 5604 if (ret) 5605 *ppos = pos; 5606 return ret; 5607 } 5608 5609 static 5610 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5611 void __user *buffer, size_t *lenp, loff_t *ppos) 5612 { 5613 struct inet6_dev *idev = ctl->extra1; 5614 int min_mtu = IPV6_MIN_MTU; 5615 struct ctl_table lctl; 5616 5617 lctl = *ctl; 5618 lctl.extra1 = &min_mtu; 5619 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5620 5621 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5622 } 5623 5624 static void dev_disable_change(struct inet6_dev *idev) 5625 { 5626 struct netdev_notifier_info info; 5627 5628 if (!idev || !idev->dev) 5629 return; 5630 5631 netdev_notifier_info_init(&info, idev->dev); 5632 if (idev->cnf.disable_ipv6) 5633 addrconf_notify(NULL, NETDEV_DOWN, &info); 5634 else 5635 addrconf_notify(NULL, NETDEV_UP, &info); 5636 } 5637 5638 static void addrconf_disable_change(struct net *net, __s32 newf) 5639 { 5640 struct net_device *dev; 5641 struct inet6_dev *idev; 5642 5643 for_each_netdev(net, dev) { 5644 idev = __in6_dev_get(dev); 5645 if (idev) { 5646 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5647 idev->cnf.disable_ipv6 = newf; 5648 if (changed) 5649 dev_disable_change(idev); 5650 } 5651 } 5652 } 5653 5654 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5655 { 5656 struct net *net; 5657 int old; 5658 5659 if (!rtnl_trylock()) 5660 return restart_syscall(); 5661 5662 net = (struct net *)table->extra2; 5663 old = *p; 5664 *p = newf; 5665 5666 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5667 rtnl_unlock(); 5668 return 0; 5669 } 5670 5671 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5672 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5673 addrconf_disable_change(net, newf); 5674 } else if ((!newf) ^ (!old)) 5675 dev_disable_change((struct inet6_dev *)table->extra1); 5676 5677 rtnl_unlock(); 5678 return 0; 5679 } 5680 5681 static 5682 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5683 void __user *buffer, size_t *lenp, loff_t *ppos) 5684 { 5685 int *valp = ctl->data; 5686 int val = *valp; 5687 loff_t pos = *ppos; 5688 struct ctl_table lctl; 5689 int ret; 5690 5691 /* 5692 * ctl->data points to idev->cnf.disable_ipv6, we should 5693 * not modify it until we get the rtnl lock. 5694 */ 5695 lctl = *ctl; 5696 lctl.data = &val; 5697 5698 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5699 5700 if (write) 5701 ret = addrconf_disable_ipv6(ctl, valp, val); 5702 if (ret) 5703 *ppos = pos; 5704 return ret; 5705 } 5706 5707 static 5708 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5709 void __user *buffer, size_t *lenp, loff_t *ppos) 5710 { 5711 int *valp = ctl->data; 5712 int ret; 5713 int old, new; 5714 5715 old = *valp; 5716 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5717 new = *valp; 5718 5719 if (write && old != new) { 5720 struct net *net = ctl->extra2; 5721 5722 if (!rtnl_trylock()) 5723 return restart_syscall(); 5724 5725 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5726 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5727 NETCONFA_PROXY_NEIGH, 5728 NETCONFA_IFINDEX_DEFAULT, 5729 net->ipv6.devconf_dflt); 5730 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5731 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5732 NETCONFA_PROXY_NEIGH, 5733 NETCONFA_IFINDEX_ALL, 5734 net->ipv6.devconf_all); 5735 else { 5736 struct inet6_dev *idev = ctl->extra1; 5737 5738 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5739 NETCONFA_PROXY_NEIGH, 5740 idev->dev->ifindex, 5741 &idev->cnf); 5742 } 5743 rtnl_unlock(); 5744 } 5745 5746 return ret; 5747 } 5748 5749 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5750 void __user *buffer, size_t *lenp, 5751 loff_t *ppos) 5752 { 5753 int ret = 0; 5754 int new_val; 5755 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5756 struct net *net = (struct net *)ctl->extra2; 5757 5758 if (!rtnl_trylock()) 5759 return restart_syscall(); 5760 5761 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5762 5763 if (write) { 5764 new_val = *((int *)ctl->data); 5765 5766 if (check_addr_gen_mode(new_val) < 0) { 5767 ret = -EINVAL; 5768 goto out; 5769 } 5770 5771 /* request for default */ 5772 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5773 ipv6_devconf_dflt.addr_gen_mode = new_val; 5774 5775 /* request for individual net device */ 5776 } else { 5777 if (!idev) 5778 goto out; 5779 5780 if (check_stable_privacy(idev, net, new_val) < 0) { 5781 ret = -EINVAL; 5782 goto out; 5783 } 5784 5785 if (idev->cnf.addr_gen_mode != new_val) { 5786 idev->cnf.addr_gen_mode = new_val; 5787 addrconf_dev_config(idev->dev); 5788 } 5789 } 5790 } 5791 5792 out: 5793 rtnl_unlock(); 5794 5795 return ret; 5796 } 5797 5798 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5799 void __user *buffer, size_t *lenp, 5800 loff_t *ppos) 5801 { 5802 int err; 5803 struct in6_addr addr; 5804 char str[IPV6_MAX_STRLEN]; 5805 struct ctl_table lctl = *ctl; 5806 struct net *net = ctl->extra2; 5807 struct ipv6_stable_secret *secret = ctl->data; 5808 5809 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5810 return -EIO; 5811 5812 lctl.maxlen = IPV6_MAX_STRLEN; 5813 lctl.data = str; 5814 5815 if (!rtnl_trylock()) 5816 return restart_syscall(); 5817 5818 if (!write && !secret->initialized) { 5819 err = -EIO; 5820 goto out; 5821 } 5822 5823 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5824 if (err >= sizeof(str)) { 5825 err = -EIO; 5826 goto out; 5827 } 5828 5829 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5830 if (err || !write) 5831 goto out; 5832 5833 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5834 err = -EIO; 5835 goto out; 5836 } 5837 5838 secret->initialized = true; 5839 secret->secret = addr; 5840 5841 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5842 struct net_device *dev; 5843 5844 for_each_netdev(net, dev) { 5845 struct inet6_dev *idev = __in6_dev_get(dev); 5846 5847 if (idev) { 5848 idev->cnf.addr_gen_mode = 5849 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5850 } 5851 } 5852 } else { 5853 struct inet6_dev *idev = ctl->extra1; 5854 5855 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5856 } 5857 5858 out: 5859 rtnl_unlock(); 5860 5861 return err; 5862 } 5863 5864 static 5865 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5866 int write, 5867 void __user *buffer, 5868 size_t *lenp, 5869 loff_t *ppos) 5870 { 5871 int *valp = ctl->data; 5872 int val = *valp; 5873 loff_t pos = *ppos; 5874 struct ctl_table lctl; 5875 int ret; 5876 5877 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5878 * we should not modify it until we get the rtnl lock. 5879 */ 5880 lctl = *ctl; 5881 lctl.data = &val; 5882 5883 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5884 5885 if (write) 5886 ret = addrconf_fixup_linkdown(ctl, valp, val); 5887 if (ret) 5888 *ppos = pos; 5889 return ret; 5890 } 5891 5892 static 5893 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5894 { 5895 if (rt) { 5896 if (action) 5897 rt->dst.flags |= DST_NOPOLICY; 5898 else 5899 rt->dst.flags &= ~DST_NOPOLICY; 5900 } 5901 } 5902 5903 static 5904 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5905 { 5906 struct inet6_ifaddr *ifa; 5907 5908 read_lock_bh(&idev->lock); 5909 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5910 spin_lock(&ifa->lock); 5911 if (ifa->rt) { 5912 struct rt6_info *rt = ifa->rt; 5913 struct fib6_table *table = rt->rt6i_table; 5914 int cpu; 5915 5916 read_lock(&table->tb6_lock); 5917 addrconf_set_nopolicy(ifa->rt, val); 5918 if (rt->rt6i_pcpu) { 5919 for_each_possible_cpu(cpu) { 5920 struct rt6_info **rtp; 5921 5922 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5923 addrconf_set_nopolicy(*rtp, val); 5924 } 5925 } 5926 read_unlock(&table->tb6_lock); 5927 } 5928 spin_unlock(&ifa->lock); 5929 } 5930 read_unlock_bh(&idev->lock); 5931 } 5932 5933 static 5934 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5935 { 5936 struct inet6_dev *idev; 5937 struct net *net; 5938 5939 if (!rtnl_trylock()) 5940 return restart_syscall(); 5941 5942 *valp = val; 5943 5944 net = (struct net *)ctl->extra2; 5945 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5946 rtnl_unlock(); 5947 return 0; 5948 } 5949 5950 if (valp == &net->ipv6.devconf_all->disable_policy) { 5951 struct net_device *dev; 5952 5953 for_each_netdev(net, dev) { 5954 idev = __in6_dev_get(dev); 5955 if (idev) 5956 addrconf_disable_policy_idev(idev, val); 5957 } 5958 } else { 5959 idev = (struct inet6_dev *)ctl->extra1; 5960 addrconf_disable_policy_idev(idev, val); 5961 } 5962 5963 rtnl_unlock(); 5964 return 0; 5965 } 5966 5967 static 5968 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5969 void __user *buffer, size_t *lenp, 5970 loff_t *ppos) 5971 { 5972 int *valp = ctl->data; 5973 int val = *valp; 5974 loff_t pos = *ppos; 5975 struct ctl_table lctl; 5976 int ret; 5977 5978 lctl = *ctl; 5979 lctl.data = &val; 5980 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5981 5982 if (write && (*valp != val)) 5983 ret = addrconf_disable_policy(ctl, valp, val); 5984 5985 if (ret) 5986 *ppos = pos; 5987 5988 return ret; 5989 } 5990 5991 static int minus_one = -1; 5992 static const int one = 1; 5993 static const int two_five_five = 255; 5994 5995 static const struct ctl_table addrconf_sysctl[] = { 5996 { 5997 .procname = "forwarding", 5998 .data = &ipv6_devconf.forwarding, 5999 .maxlen = sizeof(int), 6000 .mode = 0644, 6001 .proc_handler = addrconf_sysctl_forward, 6002 }, 6003 { 6004 .procname = "hop_limit", 6005 .data = &ipv6_devconf.hop_limit, 6006 .maxlen = sizeof(int), 6007 .mode = 0644, 6008 .proc_handler = proc_dointvec_minmax, 6009 .extra1 = (void *)&one, 6010 .extra2 = (void *)&two_five_five, 6011 }, 6012 { 6013 .procname = "mtu", 6014 .data = &ipv6_devconf.mtu6, 6015 .maxlen = sizeof(int), 6016 .mode = 0644, 6017 .proc_handler = addrconf_sysctl_mtu, 6018 }, 6019 { 6020 .procname = "accept_ra", 6021 .data = &ipv6_devconf.accept_ra, 6022 .maxlen = sizeof(int), 6023 .mode = 0644, 6024 .proc_handler = proc_dointvec, 6025 }, 6026 { 6027 .procname = "accept_redirects", 6028 .data = &ipv6_devconf.accept_redirects, 6029 .maxlen = sizeof(int), 6030 .mode = 0644, 6031 .proc_handler = proc_dointvec, 6032 }, 6033 { 6034 .procname = "autoconf", 6035 .data = &ipv6_devconf.autoconf, 6036 .maxlen = sizeof(int), 6037 .mode = 0644, 6038 .proc_handler = proc_dointvec, 6039 }, 6040 { 6041 .procname = "dad_transmits", 6042 .data = &ipv6_devconf.dad_transmits, 6043 .maxlen = sizeof(int), 6044 .mode = 0644, 6045 .proc_handler = proc_dointvec, 6046 }, 6047 { 6048 .procname = "router_solicitations", 6049 .data = &ipv6_devconf.rtr_solicits, 6050 .maxlen = sizeof(int), 6051 .mode = 0644, 6052 .proc_handler = proc_dointvec_minmax, 6053 .extra1 = &minus_one, 6054 }, 6055 { 6056 .procname = "router_solicitation_interval", 6057 .data = &ipv6_devconf.rtr_solicit_interval, 6058 .maxlen = sizeof(int), 6059 .mode = 0644, 6060 .proc_handler = proc_dointvec_jiffies, 6061 }, 6062 { 6063 .procname = "router_solicitation_max_interval", 6064 .data = &ipv6_devconf.rtr_solicit_max_interval, 6065 .maxlen = sizeof(int), 6066 .mode = 0644, 6067 .proc_handler = proc_dointvec_jiffies, 6068 }, 6069 { 6070 .procname = "router_solicitation_delay", 6071 .data = &ipv6_devconf.rtr_solicit_delay, 6072 .maxlen = sizeof(int), 6073 .mode = 0644, 6074 .proc_handler = proc_dointvec_jiffies, 6075 }, 6076 { 6077 .procname = "force_mld_version", 6078 .data = &ipv6_devconf.force_mld_version, 6079 .maxlen = sizeof(int), 6080 .mode = 0644, 6081 .proc_handler = proc_dointvec, 6082 }, 6083 { 6084 .procname = "mldv1_unsolicited_report_interval", 6085 .data = 6086 &ipv6_devconf.mldv1_unsolicited_report_interval, 6087 .maxlen = sizeof(int), 6088 .mode = 0644, 6089 .proc_handler = proc_dointvec_ms_jiffies, 6090 }, 6091 { 6092 .procname = "mldv2_unsolicited_report_interval", 6093 .data = 6094 &ipv6_devconf.mldv2_unsolicited_report_interval, 6095 .maxlen = sizeof(int), 6096 .mode = 0644, 6097 .proc_handler = proc_dointvec_ms_jiffies, 6098 }, 6099 { 6100 .procname = "use_tempaddr", 6101 .data = &ipv6_devconf.use_tempaddr, 6102 .maxlen = sizeof(int), 6103 .mode = 0644, 6104 .proc_handler = proc_dointvec, 6105 }, 6106 { 6107 .procname = "temp_valid_lft", 6108 .data = &ipv6_devconf.temp_valid_lft, 6109 .maxlen = sizeof(int), 6110 .mode = 0644, 6111 .proc_handler = proc_dointvec, 6112 }, 6113 { 6114 .procname = "temp_prefered_lft", 6115 .data = &ipv6_devconf.temp_prefered_lft, 6116 .maxlen = sizeof(int), 6117 .mode = 0644, 6118 .proc_handler = proc_dointvec, 6119 }, 6120 { 6121 .procname = "regen_max_retry", 6122 .data = &ipv6_devconf.regen_max_retry, 6123 .maxlen = sizeof(int), 6124 .mode = 0644, 6125 .proc_handler = proc_dointvec, 6126 }, 6127 { 6128 .procname = "max_desync_factor", 6129 .data = &ipv6_devconf.max_desync_factor, 6130 .maxlen = sizeof(int), 6131 .mode = 0644, 6132 .proc_handler = proc_dointvec, 6133 }, 6134 { 6135 .procname = "max_addresses", 6136 .data = &ipv6_devconf.max_addresses, 6137 .maxlen = sizeof(int), 6138 .mode = 0644, 6139 .proc_handler = proc_dointvec, 6140 }, 6141 { 6142 .procname = "accept_ra_defrtr", 6143 .data = &ipv6_devconf.accept_ra_defrtr, 6144 .maxlen = sizeof(int), 6145 .mode = 0644, 6146 .proc_handler = proc_dointvec, 6147 }, 6148 { 6149 .procname = "accept_ra_min_hop_limit", 6150 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6151 .maxlen = sizeof(int), 6152 .mode = 0644, 6153 .proc_handler = proc_dointvec, 6154 }, 6155 { 6156 .procname = "accept_ra_pinfo", 6157 .data = &ipv6_devconf.accept_ra_pinfo, 6158 .maxlen = sizeof(int), 6159 .mode = 0644, 6160 .proc_handler = proc_dointvec, 6161 }, 6162 #ifdef CONFIG_IPV6_ROUTER_PREF 6163 { 6164 .procname = "accept_ra_rtr_pref", 6165 .data = &ipv6_devconf.accept_ra_rtr_pref, 6166 .maxlen = sizeof(int), 6167 .mode = 0644, 6168 .proc_handler = proc_dointvec, 6169 }, 6170 { 6171 .procname = "router_probe_interval", 6172 .data = &ipv6_devconf.rtr_probe_interval, 6173 .maxlen = sizeof(int), 6174 .mode = 0644, 6175 .proc_handler = proc_dointvec_jiffies, 6176 }, 6177 #ifdef CONFIG_IPV6_ROUTE_INFO 6178 { 6179 .procname = "accept_ra_rt_info_min_plen", 6180 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6181 .maxlen = sizeof(int), 6182 .mode = 0644, 6183 .proc_handler = proc_dointvec, 6184 }, 6185 { 6186 .procname = "accept_ra_rt_info_max_plen", 6187 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6188 .maxlen = sizeof(int), 6189 .mode = 0644, 6190 .proc_handler = proc_dointvec, 6191 }, 6192 #endif 6193 #endif 6194 { 6195 .procname = "proxy_ndp", 6196 .data = &ipv6_devconf.proxy_ndp, 6197 .maxlen = sizeof(int), 6198 .mode = 0644, 6199 .proc_handler = addrconf_sysctl_proxy_ndp, 6200 }, 6201 { 6202 .procname = "accept_source_route", 6203 .data = &ipv6_devconf.accept_source_route, 6204 .maxlen = sizeof(int), 6205 .mode = 0644, 6206 .proc_handler = proc_dointvec, 6207 }, 6208 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6209 { 6210 .procname = "optimistic_dad", 6211 .data = &ipv6_devconf.optimistic_dad, 6212 .maxlen = sizeof(int), 6213 .mode = 0644, 6214 .proc_handler = proc_dointvec, 6215 }, 6216 { 6217 .procname = "use_optimistic", 6218 .data = &ipv6_devconf.use_optimistic, 6219 .maxlen = sizeof(int), 6220 .mode = 0644, 6221 .proc_handler = proc_dointvec, 6222 }, 6223 #endif 6224 #ifdef CONFIG_IPV6_MROUTE 6225 { 6226 .procname = "mc_forwarding", 6227 .data = &ipv6_devconf.mc_forwarding, 6228 .maxlen = sizeof(int), 6229 .mode = 0444, 6230 .proc_handler = proc_dointvec, 6231 }, 6232 #endif 6233 { 6234 .procname = "disable_ipv6", 6235 .data = &ipv6_devconf.disable_ipv6, 6236 .maxlen = sizeof(int), 6237 .mode = 0644, 6238 .proc_handler = addrconf_sysctl_disable, 6239 }, 6240 { 6241 .procname = "accept_dad", 6242 .data = &ipv6_devconf.accept_dad, 6243 .maxlen = sizeof(int), 6244 .mode = 0644, 6245 .proc_handler = proc_dointvec, 6246 }, 6247 { 6248 .procname = "force_tllao", 6249 .data = &ipv6_devconf.force_tllao, 6250 .maxlen = sizeof(int), 6251 .mode = 0644, 6252 .proc_handler = proc_dointvec 6253 }, 6254 { 6255 .procname = "ndisc_notify", 6256 .data = &ipv6_devconf.ndisc_notify, 6257 .maxlen = sizeof(int), 6258 .mode = 0644, 6259 .proc_handler = proc_dointvec 6260 }, 6261 { 6262 .procname = "suppress_frag_ndisc", 6263 .data = &ipv6_devconf.suppress_frag_ndisc, 6264 .maxlen = sizeof(int), 6265 .mode = 0644, 6266 .proc_handler = proc_dointvec 6267 }, 6268 { 6269 .procname = "accept_ra_from_local", 6270 .data = &ipv6_devconf.accept_ra_from_local, 6271 .maxlen = sizeof(int), 6272 .mode = 0644, 6273 .proc_handler = proc_dointvec, 6274 }, 6275 { 6276 .procname = "accept_ra_mtu", 6277 .data = &ipv6_devconf.accept_ra_mtu, 6278 .maxlen = sizeof(int), 6279 .mode = 0644, 6280 .proc_handler = proc_dointvec, 6281 }, 6282 { 6283 .procname = "stable_secret", 6284 .data = &ipv6_devconf.stable_secret, 6285 .maxlen = IPV6_MAX_STRLEN, 6286 .mode = 0600, 6287 .proc_handler = addrconf_sysctl_stable_secret, 6288 }, 6289 { 6290 .procname = "use_oif_addrs_only", 6291 .data = &ipv6_devconf.use_oif_addrs_only, 6292 .maxlen = sizeof(int), 6293 .mode = 0644, 6294 .proc_handler = proc_dointvec, 6295 }, 6296 { 6297 .procname = "ignore_routes_with_linkdown", 6298 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6299 .maxlen = sizeof(int), 6300 .mode = 0644, 6301 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6302 }, 6303 { 6304 .procname = "drop_unicast_in_l2_multicast", 6305 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6306 .maxlen = sizeof(int), 6307 .mode = 0644, 6308 .proc_handler = proc_dointvec, 6309 }, 6310 { 6311 .procname = "drop_unsolicited_na", 6312 .data = &ipv6_devconf.drop_unsolicited_na, 6313 .maxlen = sizeof(int), 6314 .mode = 0644, 6315 .proc_handler = proc_dointvec, 6316 }, 6317 { 6318 .procname = "keep_addr_on_down", 6319 .data = &ipv6_devconf.keep_addr_on_down, 6320 .maxlen = sizeof(int), 6321 .mode = 0644, 6322 .proc_handler = proc_dointvec, 6323 6324 }, 6325 { 6326 .procname = "seg6_enabled", 6327 .data = &ipv6_devconf.seg6_enabled, 6328 .maxlen = sizeof(int), 6329 .mode = 0644, 6330 .proc_handler = proc_dointvec, 6331 }, 6332 #ifdef CONFIG_IPV6_SEG6_HMAC 6333 { 6334 .procname = "seg6_require_hmac", 6335 .data = &ipv6_devconf.seg6_require_hmac, 6336 .maxlen = sizeof(int), 6337 .mode = 0644, 6338 .proc_handler = proc_dointvec, 6339 }, 6340 #endif 6341 { 6342 .procname = "enhanced_dad", 6343 .data = &ipv6_devconf.enhanced_dad, 6344 .maxlen = sizeof(int), 6345 .mode = 0644, 6346 .proc_handler = proc_dointvec, 6347 }, 6348 { 6349 .procname = "addr_gen_mode", 6350 .data = &ipv6_devconf.addr_gen_mode, 6351 .maxlen = sizeof(int), 6352 .mode = 0644, 6353 .proc_handler = addrconf_sysctl_addr_gen_mode, 6354 }, 6355 { 6356 .procname = "disable_policy", 6357 .data = &ipv6_devconf.disable_policy, 6358 .maxlen = sizeof(int), 6359 .mode = 0644, 6360 .proc_handler = addrconf_sysctl_disable_policy, 6361 }, 6362 { 6363 /* sentinel */ 6364 } 6365 }; 6366 6367 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6368 struct inet6_dev *idev, struct ipv6_devconf *p) 6369 { 6370 int i, ifindex; 6371 struct ctl_table *table; 6372 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6373 6374 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6375 if (!table) 6376 goto out; 6377 6378 for (i = 0; table[i].data; i++) { 6379 table[i].data += (char *)p - (char *)&ipv6_devconf; 6380 /* If one of these is already set, then it is not safe to 6381 * overwrite either of them: this makes proc_dointvec_minmax 6382 * usable. 6383 */ 6384 if (!table[i].extra1 && !table[i].extra2) { 6385 table[i].extra1 = idev; /* embedded; no ref */ 6386 table[i].extra2 = net; 6387 } 6388 } 6389 6390 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6391 6392 p->sysctl_header = register_net_sysctl(net, path, table); 6393 if (!p->sysctl_header) 6394 goto free; 6395 6396 if (!strcmp(dev_name, "all")) 6397 ifindex = NETCONFA_IFINDEX_ALL; 6398 else if (!strcmp(dev_name, "default")) 6399 ifindex = NETCONFA_IFINDEX_DEFAULT; 6400 else 6401 ifindex = idev->dev->ifindex; 6402 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6403 ifindex, p); 6404 return 0; 6405 6406 free: 6407 kfree(table); 6408 out: 6409 return -ENOBUFS; 6410 } 6411 6412 static void __addrconf_sysctl_unregister(struct net *net, 6413 struct ipv6_devconf *p, int ifindex) 6414 { 6415 struct ctl_table *table; 6416 6417 if (!p->sysctl_header) 6418 return; 6419 6420 table = p->sysctl_header->ctl_table_arg; 6421 unregister_net_sysctl_table(p->sysctl_header); 6422 p->sysctl_header = NULL; 6423 kfree(table); 6424 6425 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6426 } 6427 6428 static int addrconf_sysctl_register(struct inet6_dev *idev) 6429 { 6430 int err; 6431 6432 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6433 return -EINVAL; 6434 6435 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6436 &ndisc_ifinfo_sysctl_change); 6437 if (err) 6438 return err; 6439 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6440 idev, &idev->cnf); 6441 if (err) 6442 neigh_sysctl_unregister(idev->nd_parms); 6443 6444 return err; 6445 } 6446 6447 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6448 { 6449 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6450 idev->dev->ifindex); 6451 neigh_sysctl_unregister(idev->nd_parms); 6452 } 6453 6454 6455 #endif 6456 6457 static int __net_init addrconf_init_net(struct net *net) 6458 { 6459 int err = -ENOMEM; 6460 struct ipv6_devconf *all, *dflt; 6461 6462 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6463 if (!all) 6464 goto err_alloc_all; 6465 6466 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6467 if (!dflt) 6468 goto err_alloc_dflt; 6469 6470 /* these will be inherited by all namespaces */ 6471 dflt->autoconf = ipv6_defaults.autoconf; 6472 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6473 6474 dflt->stable_secret.initialized = false; 6475 all->stable_secret.initialized = false; 6476 6477 net->ipv6.devconf_all = all; 6478 net->ipv6.devconf_dflt = dflt; 6479 6480 #ifdef CONFIG_SYSCTL 6481 err = __addrconf_sysctl_register(net, "all", NULL, all); 6482 if (err < 0) 6483 goto err_reg_all; 6484 6485 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6486 if (err < 0) 6487 goto err_reg_dflt; 6488 #endif 6489 return 0; 6490 6491 #ifdef CONFIG_SYSCTL 6492 err_reg_dflt: 6493 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6494 err_reg_all: 6495 kfree(dflt); 6496 #endif 6497 err_alloc_dflt: 6498 kfree(all); 6499 err_alloc_all: 6500 return err; 6501 } 6502 6503 static void __net_exit addrconf_exit_net(struct net *net) 6504 { 6505 #ifdef CONFIG_SYSCTL 6506 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6507 NETCONFA_IFINDEX_DEFAULT); 6508 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6509 NETCONFA_IFINDEX_ALL); 6510 #endif 6511 kfree(net->ipv6.devconf_dflt); 6512 kfree(net->ipv6.devconf_all); 6513 } 6514 6515 static struct pernet_operations addrconf_ops = { 6516 .init = addrconf_init_net, 6517 .exit = addrconf_exit_net, 6518 }; 6519 6520 static struct rtnl_af_ops inet6_ops __read_mostly = { 6521 .family = AF_INET6, 6522 .fill_link_af = inet6_fill_link_af, 6523 .get_link_af_size = inet6_get_link_af_size, 6524 .validate_link_af = inet6_validate_link_af, 6525 .set_link_af = inet6_set_link_af, 6526 }; 6527 6528 /* 6529 * Init / cleanup code 6530 */ 6531 6532 int __init addrconf_init(void) 6533 { 6534 struct inet6_dev *idev; 6535 int i, err; 6536 6537 err = ipv6_addr_label_init(); 6538 if (err < 0) { 6539 pr_crit("%s: cannot initialize default policy table: %d\n", 6540 __func__, err); 6541 goto out; 6542 } 6543 6544 err = register_pernet_subsys(&addrconf_ops); 6545 if (err < 0) 6546 goto out_addrlabel; 6547 6548 addrconf_wq = create_workqueue("ipv6_addrconf"); 6549 if (!addrconf_wq) { 6550 err = -ENOMEM; 6551 goto out_nowq; 6552 } 6553 6554 /* The addrconf netdev notifier requires that loopback_dev 6555 * has it's ipv6 private information allocated and setup 6556 * before it can bring up and give link-local addresses 6557 * to other devices which are up. 6558 * 6559 * Unfortunately, loopback_dev is not necessarily the first 6560 * entry in the global dev_base list of net devices. In fact, 6561 * it is likely to be the very last entry on that list. 6562 * So this causes the notifier registry below to try and 6563 * give link-local addresses to all devices besides loopback_dev 6564 * first, then loopback_dev, which cases all the non-loopback_dev 6565 * devices to fail to get a link-local address. 6566 * 6567 * So, as a temporary fix, allocate the ipv6 structure for 6568 * loopback_dev first by hand. 6569 * Longer term, all of the dependencies ipv6 has upon the loopback 6570 * device and it being up should be removed. 6571 */ 6572 rtnl_lock(); 6573 idev = ipv6_add_dev(init_net.loopback_dev); 6574 rtnl_unlock(); 6575 if (IS_ERR(idev)) { 6576 err = PTR_ERR(idev); 6577 goto errlo; 6578 } 6579 6580 ip6_route_init_special_entries(); 6581 6582 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6583 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6584 6585 register_netdevice_notifier(&ipv6_dev_notf); 6586 6587 addrconf_verify(); 6588 6589 rtnl_af_register(&inet6_ops); 6590 6591 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6592 NULL); 6593 if (err < 0) 6594 goto errout; 6595 6596 /* Only the first call to __rtnl_register can fail */ 6597 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6598 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6599 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6600 inet6_dump_ifaddr, NULL); 6601 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6602 inet6_dump_ifmcaddr, NULL); 6603 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6604 inet6_dump_ifacaddr, NULL); 6605 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6606 inet6_netconf_dump_devconf, NULL); 6607 6608 ipv6_addr_label_rtnl_register(); 6609 6610 return 0; 6611 errout: 6612 rtnl_af_unregister(&inet6_ops); 6613 unregister_netdevice_notifier(&ipv6_dev_notf); 6614 errlo: 6615 destroy_workqueue(addrconf_wq); 6616 out_nowq: 6617 unregister_pernet_subsys(&addrconf_ops); 6618 out_addrlabel: 6619 ipv6_addr_label_cleanup(); 6620 out: 6621 return err; 6622 } 6623 6624 void addrconf_cleanup(void) 6625 { 6626 struct net_device *dev; 6627 int i; 6628 6629 unregister_netdevice_notifier(&ipv6_dev_notf); 6630 unregister_pernet_subsys(&addrconf_ops); 6631 ipv6_addr_label_cleanup(); 6632 6633 rtnl_lock(); 6634 6635 __rtnl_af_unregister(&inet6_ops); 6636 6637 /* clean dev list */ 6638 for_each_netdev(&init_net, dev) { 6639 if (__in6_dev_get(dev) == NULL) 6640 continue; 6641 addrconf_ifdown(dev, 1); 6642 } 6643 addrconf_ifdown(init_net.loopback_dev, 2); 6644 6645 /* 6646 * Check hash table. 6647 */ 6648 spin_lock_bh(&addrconf_hash_lock); 6649 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6650 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6651 spin_unlock_bh(&addrconf_hash_lock); 6652 cancel_delayed_work(&addr_chk_work); 6653 rtnl_unlock(); 6654 6655 destroy_workqueue(addrconf_wq); 6656 } 6657