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 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 else 389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 393 if (!ndev->nd_parms) { 394 kfree(ndev); 395 return ERR_PTR(err); 396 } 397 if (ndev->cnf.forwarding) 398 dev_disable_lro(dev); 399 /* We refer to the device */ 400 dev_hold(dev); 401 402 if (snmp6_alloc_dev(ndev) < 0) { 403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 404 __func__); 405 neigh_parms_release(&nd_tbl, ndev->nd_parms); 406 dev_put(dev); 407 kfree(ndev); 408 return ERR_PTR(err); 409 } 410 411 if (snmp6_register_dev(ndev) < 0) { 412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 413 __func__, dev->name); 414 goto err_release; 415 } 416 417 /* One reference from device. */ 418 refcount_set(&ndev->refcnt, 1); 419 420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 421 ndev->cnf.accept_dad = -1; 422 423 #if IS_ENABLED(CONFIG_IPV6_SIT) 424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 425 pr_info("%s: Disabled Multicast RS\n", dev->name); 426 ndev->cnf.rtr_solicits = 0; 427 } 428 #endif 429 430 INIT_LIST_HEAD(&ndev->tempaddr_list); 431 ndev->desync_factor = U32_MAX; 432 if ((dev->flags&IFF_LOOPBACK) || 433 dev->type == ARPHRD_TUNNEL || 434 dev->type == ARPHRD_TUNNEL6 || 435 dev->type == ARPHRD_SIT || 436 dev->type == ARPHRD_NONE) { 437 ndev->cnf.use_tempaddr = -1; 438 } else 439 ipv6_regen_rndid(ndev); 440 441 ndev->token = in6addr_any; 442 443 if (netif_running(dev) && addrconf_link_ready(dev)) 444 ndev->if_flags |= IF_READY; 445 446 ipv6_mc_init_dev(ndev); 447 ndev->tstamp = jiffies; 448 err = addrconf_sysctl_register(ndev); 449 if (err) { 450 ipv6_mc_destroy_dev(ndev); 451 snmp6_unregister_dev(ndev); 452 goto err_release; 453 } 454 /* protected by rtnl_lock */ 455 rcu_assign_pointer(dev->ip6_ptr, ndev); 456 457 /* Join interface-local all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 459 460 /* Join all-node multicast group */ 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 462 463 /* Join all-router multicast group if forwarding is set */ 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 467 return ndev; 468 469 err_release: 470 neigh_parms_release(&nd_tbl, ndev->nd_parms); 471 ndev->dead = 1; 472 in6_dev_finish_destroy(ndev); 473 return ERR_PTR(err); 474 } 475 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 477 { 478 struct inet6_dev *idev; 479 480 ASSERT_RTNL(); 481 482 idev = __in6_dev_get(dev); 483 if (!idev) { 484 idev = ipv6_add_dev(dev); 485 if (IS_ERR(idev)) 486 return NULL; 487 } 488 489 if (dev->flags&IFF_UP) 490 ipv6_mc_up(idev); 491 return idev; 492 } 493 494 static int inet6_netconf_msgsize_devconf(int type) 495 { 496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 497 + nla_total_size(4); /* NETCONFA_IFINDEX */ 498 bool all = false; 499 500 if (type == NETCONFA_ALL) 501 all = true; 502 503 if (all || type == NETCONFA_FORWARDING) 504 size += nla_total_size(4); 505 #ifdef CONFIG_IPV6_MROUTE 506 if (all || type == NETCONFA_MC_FORWARDING) 507 size += nla_total_size(4); 508 #endif 509 if (all || type == NETCONFA_PROXY_NEIGH) 510 size += nla_total_size(4); 511 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 513 size += nla_total_size(4); 514 515 return size; 516 } 517 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 519 struct ipv6_devconf *devconf, u32 portid, 520 u32 seq, int event, unsigned int flags, 521 int type) 522 { 523 struct nlmsghdr *nlh; 524 struct netconfmsg *ncm; 525 bool all = false; 526 527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 528 flags); 529 if (!nlh) 530 return -EMSGSIZE; 531 532 if (type == NETCONFA_ALL) 533 all = true; 534 535 ncm = nlmsg_data(nlh); 536 ncm->ncm_family = AF_INET6; 537 538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 539 goto nla_put_failure; 540 541 if (!devconf) 542 goto out; 543 544 if ((all || type == NETCONFA_FORWARDING) && 545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 546 goto nla_put_failure; 547 #ifdef CONFIG_IPV6_MROUTE 548 if ((all || type == NETCONFA_MC_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 550 devconf->mc_forwarding) < 0) 551 goto nla_put_failure; 552 #endif 553 if ((all || type == NETCONFA_PROXY_NEIGH) && 554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 555 goto nla_put_failure; 556 557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 559 devconf->ignore_routes_with_linkdown) < 0) 560 goto nla_put_failure; 561 562 out: 563 nlmsg_end(skb, nlh); 564 return 0; 565 566 nla_put_failure: 567 nlmsg_cancel(skb, nlh); 568 return -EMSGSIZE; 569 } 570 571 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 572 int ifindex, struct ipv6_devconf *devconf) 573 { 574 struct sk_buff *skb; 575 int err = -ENOBUFS; 576 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 578 if (!skb) 579 goto errout; 580 581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 582 event, 0, type); 583 if (err < 0) { 584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 585 WARN_ON(err == -EMSGSIZE); 586 kfree_skb(skb); 587 goto errout; 588 } 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 590 return; 591 errout: 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 593 } 594 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 596 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 597 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 600 }; 601 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 603 struct nlmsghdr *nlh, 604 struct netlink_ext_ack *extack) 605 { 606 struct net *net = sock_net(in_skb->sk); 607 struct nlattr *tb[NETCONFA_MAX+1]; 608 struct inet6_dev *in6_dev = NULL; 609 struct net_device *dev = NULL; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 int ifindex; 614 int err; 615 616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 617 devconf_ipv6_policy, extack); 618 if (err < 0) 619 return err; 620 621 if (!tb[NETCONFA_IFINDEX]) 622 return -EINVAL; 623 624 err = -EINVAL; 625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 626 switch (ifindex) { 627 case NETCONFA_IFINDEX_ALL: 628 devconf = net->ipv6.devconf_all; 629 break; 630 case NETCONFA_IFINDEX_DEFAULT: 631 devconf = net->ipv6.devconf_dflt; 632 break; 633 default: 634 dev = dev_get_by_index(net, ifindex); 635 if (!dev) 636 return -EINVAL; 637 in6_dev = in6_dev_get(dev); 638 if (!in6_dev) 639 goto errout; 640 devconf = &in6_dev->cnf; 641 break; 642 } 643 644 err = -ENOBUFS; 645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 646 if (!skb) 647 goto errout; 648 649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 650 NETLINK_CB(in_skb).portid, 651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 652 NETCONFA_ALL); 653 if (err < 0) { 654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 655 WARN_ON(err == -EMSGSIZE); 656 kfree_skb(skb); 657 goto errout; 658 } 659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 660 errout: 661 if (in6_dev) 662 in6_dev_put(in6_dev); 663 if (dev) 664 dev_put(dev); 665 return err; 666 } 667 668 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 669 struct netlink_callback *cb) 670 { 671 struct net *net = sock_net(skb->sk); 672 int h, s_h; 673 int idx, s_idx; 674 struct net_device *dev; 675 struct inet6_dev *idev; 676 struct hlist_head *head; 677 678 s_h = cb->args[0]; 679 s_idx = idx = cb->args[1]; 680 681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 682 idx = 0; 683 head = &net->dev_index_head[h]; 684 rcu_read_lock(); 685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 686 net->dev_base_seq; 687 hlist_for_each_entry_rcu(dev, head, index_hlist) { 688 if (idx < s_idx) 689 goto cont; 690 idev = __in6_dev_get(dev); 691 if (!idev) 692 goto cont; 693 694 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 695 &idev->cnf, 696 NETLINK_CB(cb->skb).portid, 697 cb->nlh->nlmsg_seq, 698 RTM_NEWNETCONF, 699 NLM_F_MULTI, 700 NETCONFA_ALL) < 0) { 701 rcu_read_unlock(); 702 goto done; 703 } 704 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 705 cont: 706 idx++; 707 } 708 rcu_read_unlock(); 709 } 710 if (h == NETDEV_HASHENTRIES) { 711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 712 net->ipv6.devconf_all, 713 NETLINK_CB(cb->skb).portid, 714 cb->nlh->nlmsg_seq, 715 RTM_NEWNETCONF, NLM_F_MULTI, 716 NETCONFA_ALL) < 0) 717 goto done; 718 else 719 h++; 720 } 721 if (h == NETDEV_HASHENTRIES + 1) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 723 net->ipv6.devconf_dflt, 724 NETLINK_CB(cb->skb).portid, 725 cb->nlh->nlmsg_seq, 726 RTM_NEWNETCONF, NLM_F_MULTI, 727 NETCONFA_ALL) < 0) 728 goto done; 729 else 730 h++; 731 } 732 done: 733 cb->args[0] = h; 734 cb->args[1] = idx; 735 736 return skb->len; 737 } 738 739 #ifdef CONFIG_SYSCTL 740 static void dev_forward_change(struct inet6_dev *idev) 741 { 742 struct net_device *dev; 743 struct inet6_ifaddr *ifa; 744 745 if (!idev) 746 return; 747 dev = idev->dev; 748 if (idev->cnf.forwarding) 749 dev_disable_lro(dev); 750 if (dev->flags & IFF_MULTICAST) { 751 if (idev->cnf.forwarding) { 752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 755 } else { 756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 759 } 760 } 761 762 list_for_each_entry(ifa, &idev->addr_list, if_list) { 763 if (ifa->flags&IFA_F_TENTATIVE) 764 continue; 765 if (idev->cnf.forwarding) 766 addrconf_join_anycast(ifa); 767 else 768 addrconf_leave_anycast(ifa); 769 } 770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 771 NETCONFA_FORWARDING, 772 dev->ifindex, &idev->cnf); 773 } 774 775 776 static void addrconf_forward_change(struct net *net, __s32 newf) 777 { 778 struct net_device *dev; 779 struct inet6_dev *idev; 780 781 for_each_netdev(net, dev) { 782 idev = __in6_dev_get(dev); 783 if (idev) { 784 int changed = (!idev->cnf.forwarding) ^ (!newf); 785 idev->cnf.forwarding = newf; 786 if (changed) 787 dev_forward_change(idev); 788 } 789 } 790 } 791 792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 793 { 794 struct net *net; 795 int old; 796 797 if (!rtnl_trylock()) 798 return restart_syscall(); 799 800 net = (struct net *)table->extra2; 801 old = *p; 802 *p = newf; 803 804 if (p == &net->ipv6.devconf_dflt->forwarding) { 805 if ((!newf) ^ (!old)) 806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 807 NETCONFA_FORWARDING, 808 NETCONFA_IFINDEX_DEFAULT, 809 net->ipv6.devconf_dflt); 810 rtnl_unlock(); 811 return 0; 812 } 813 814 if (p == &net->ipv6.devconf_all->forwarding) { 815 int old_dflt = net->ipv6.devconf_dflt->forwarding; 816 817 net->ipv6.devconf_dflt->forwarding = newf; 818 if ((!newf) ^ (!old_dflt)) 819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 820 NETCONFA_FORWARDING, 821 NETCONFA_IFINDEX_DEFAULT, 822 net->ipv6.devconf_dflt); 823 824 addrconf_forward_change(net, newf); 825 if ((!newf) ^ (!old)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_ALL, 829 net->ipv6.devconf_all); 830 } else if ((!newf) ^ (!old)) 831 dev_forward_change((struct inet6_dev *)table->extra1); 832 rtnl_unlock(); 833 834 if (newf) 835 rt6_purge_dflt_routers(net); 836 return 1; 837 } 838 839 static void addrconf_linkdown_change(struct net *net, __s32 newf) 840 { 841 struct net_device *dev; 842 struct inet6_dev *idev; 843 844 for_each_netdev(net, dev) { 845 idev = __in6_dev_get(dev); 846 if (idev) { 847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 848 849 idev->cnf.ignore_routes_with_linkdown = newf; 850 if (changed) 851 inet6_netconf_notify_devconf(dev_net(dev), 852 RTM_NEWNETCONF, 853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 854 dev->ifindex, 855 &idev->cnf); 856 } 857 } 858 } 859 860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 861 { 862 struct net *net; 863 int old; 864 865 if (!rtnl_trylock()) 866 return restart_syscall(); 867 868 net = (struct net *)table->extra2; 869 old = *p; 870 *p = newf; 871 872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, 875 RTM_NEWNETCONF, 876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 877 NETCONFA_IFINDEX_DEFAULT, 878 net->ipv6.devconf_dflt); 879 rtnl_unlock(); 880 return 0; 881 } 882 883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 885 addrconf_linkdown_change(net, newf); 886 if ((!newf) ^ (!old)) 887 inet6_netconf_notify_devconf(net, 888 RTM_NEWNETCONF, 889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 890 NETCONFA_IFINDEX_ALL, 891 net->ipv6.devconf_all); 892 } 893 rtnl_unlock(); 894 895 return 1; 896 } 897 898 #endif 899 900 /* Nobody refers to this ifaddr, destroy it */ 901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 902 { 903 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 904 905 #ifdef NET_REFCNT_DEBUG 906 pr_debug("%s\n", __func__); 907 #endif 908 909 in6_dev_put(ifp->idev); 910 911 if (cancel_delayed_work(&ifp->dad_work)) 912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 913 ifp); 914 915 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 916 pr_warn("Freeing alive inet6 address %p\n", ifp); 917 return; 918 } 919 ip6_rt_put(ifp->rt); 920 921 kfree_rcu(ifp, rcu); 922 } 923 924 static void 925 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 926 { 927 struct list_head *p; 928 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 929 930 /* 931 * Each device address list is sorted in order of scope - 932 * global before linklocal. 933 */ 934 list_for_each(p, &idev->addr_list) { 935 struct inet6_ifaddr *ifa 936 = list_entry(p, struct inet6_ifaddr, if_list); 937 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 938 break; 939 } 940 941 list_add_tail_rcu(&ifp->if_list, p); 942 } 943 944 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 945 { 946 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 947 948 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 949 } 950 951 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 952 struct net_device *dev, unsigned int hash) 953 { 954 struct inet6_ifaddr *ifp; 955 956 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 957 if (!net_eq(dev_net(ifp->idev->dev), net)) 958 continue; 959 if (ipv6_addr_equal(&ifp->addr, addr)) { 960 if (!dev || ifp->idev->dev == dev) 961 return true; 962 } 963 } 964 return false; 965 } 966 967 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 968 { 969 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 970 int err = 0; 971 972 spin_lock(&addrconf_hash_lock); 973 974 /* Ignore adding duplicate addresses on an interface */ 975 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 976 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 977 err = -EEXIST; 978 } else { 979 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 980 } 981 982 spin_unlock(&addrconf_hash_lock); 983 984 return err; 985 } 986 987 /* On success it returns ifp with increased reference count */ 988 989 static struct inet6_ifaddr * 990 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 991 const struct in6_addr *peer_addr, int pfxlen, 992 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 993 bool can_block, struct netlink_ext_ack *extack) 994 { 995 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 996 struct net *net = dev_net(idev->dev); 997 struct inet6_ifaddr *ifa = NULL; 998 struct rt6_info *rt = NULL; 999 int err = 0; 1000 int addr_type = ipv6_addr_type(addr); 1001 1002 if (addr_type == IPV6_ADDR_ANY || 1003 addr_type & IPV6_ADDR_MULTICAST || 1004 (!(idev->dev->flags & IFF_LOOPBACK) && 1005 addr_type & IPV6_ADDR_LOOPBACK)) 1006 return ERR_PTR(-EADDRNOTAVAIL); 1007 1008 if (idev->dead) { 1009 err = -ENODEV; /*XXX*/ 1010 goto out; 1011 } 1012 1013 if (idev->cnf.disable_ipv6) { 1014 err = -EACCES; 1015 goto out; 1016 } 1017 1018 /* validator notifier needs to be blocking; 1019 * do not call in atomic context 1020 */ 1021 if (can_block) { 1022 struct in6_validator_info i6vi = { 1023 .i6vi_addr = *addr, 1024 .i6vi_dev = idev, 1025 .extack = extack, 1026 }; 1027 1028 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1029 err = notifier_to_errno(err); 1030 if (err < 0) 1031 goto out; 1032 } 1033 1034 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1035 if (!ifa) { 1036 err = -ENOBUFS; 1037 goto out; 1038 } 1039 1040 rt = addrconf_dst_alloc(idev, addr, false); 1041 if (IS_ERR(rt)) { 1042 err = PTR_ERR(rt); 1043 rt = NULL; 1044 goto out; 1045 } 1046 1047 if (net->ipv6.devconf_all->disable_policy || 1048 idev->cnf.disable_policy) 1049 rt->dst.flags |= DST_NOPOLICY; 1050 1051 neigh_parms_data_state_setall(idev->nd_parms); 1052 1053 ifa->addr = *addr; 1054 if (peer_addr) 1055 ifa->peer_addr = *peer_addr; 1056 1057 spin_lock_init(&ifa->lock); 1058 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1059 INIT_HLIST_NODE(&ifa->addr_lst); 1060 ifa->scope = scope; 1061 ifa->prefix_len = pfxlen; 1062 ifa->flags = flags; 1063 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1064 if (!(flags & IFA_F_NODAD)) 1065 ifa->flags |= IFA_F_TENTATIVE; 1066 ifa->valid_lft = valid_lft; 1067 ifa->prefered_lft = prefered_lft; 1068 ifa->cstamp = ifa->tstamp = jiffies; 1069 ifa->tokenized = false; 1070 1071 ifa->rt = rt; 1072 1073 ifa->idev = idev; 1074 in6_dev_hold(idev); 1075 1076 /* For caller */ 1077 refcount_set(&ifa->refcnt, 1); 1078 1079 rcu_read_lock_bh(); 1080 1081 err = ipv6_add_addr_hash(idev->dev, ifa); 1082 if (err < 0) { 1083 rcu_read_unlock_bh(); 1084 goto out; 1085 } 1086 1087 write_lock(&idev->lock); 1088 1089 /* Add to inet6_dev unicast addr list. */ 1090 ipv6_link_dev_addr(idev, ifa); 1091 1092 if (ifa->flags&IFA_F_TEMPORARY) { 1093 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1094 in6_ifa_hold(ifa); 1095 } 1096 1097 in6_ifa_hold(ifa); 1098 write_unlock(&idev->lock); 1099 1100 rcu_read_unlock_bh(); 1101 1102 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1103 out: 1104 if (unlikely(err < 0)) { 1105 if (rt) 1106 ip6_rt_put(rt); 1107 if (ifa) { 1108 if (ifa->idev) 1109 in6_dev_put(ifa->idev); 1110 kfree(ifa); 1111 } 1112 ifa = ERR_PTR(err); 1113 } 1114 1115 return ifa; 1116 } 1117 1118 enum cleanup_prefix_rt_t { 1119 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1120 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1121 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1122 }; 1123 1124 /* 1125 * Check, whether the prefix for ifp would still need a prefix route 1126 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1127 * constants. 1128 * 1129 * 1) we don't purge prefix if address was not permanent. 1130 * prefix is managed by its own lifetime. 1131 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1132 * 3) if there are no addresses, delete prefix. 1133 * 4) if there are still other permanent address(es), 1134 * corresponding prefix is still permanent. 1135 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1136 * don't purge the prefix, assume user space is managing it. 1137 * 6) otherwise, update prefix lifetime to the 1138 * longest valid lifetime among the corresponding 1139 * addresses on the device. 1140 * Note: subsequent RA will update lifetime. 1141 **/ 1142 static enum cleanup_prefix_rt_t 1143 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1144 { 1145 struct inet6_ifaddr *ifa; 1146 struct inet6_dev *idev = ifp->idev; 1147 unsigned long lifetime; 1148 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1149 1150 *expires = jiffies; 1151 1152 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1153 if (ifa == ifp) 1154 continue; 1155 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1156 ifp->prefix_len)) 1157 continue; 1158 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1159 return CLEANUP_PREFIX_RT_NOP; 1160 1161 action = CLEANUP_PREFIX_RT_EXPIRE; 1162 1163 spin_lock(&ifa->lock); 1164 1165 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1166 /* 1167 * Note: Because this address is 1168 * not permanent, lifetime < 1169 * LONG_MAX / HZ here. 1170 */ 1171 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1172 *expires = ifa->tstamp + lifetime * HZ; 1173 spin_unlock(&ifa->lock); 1174 } 1175 1176 return action; 1177 } 1178 1179 static void 1180 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1181 { 1182 struct rt6_info *rt; 1183 1184 rt = addrconf_get_prefix_route(&ifp->addr, 1185 ifp->prefix_len, 1186 ifp->idev->dev, 1187 0, RTF_GATEWAY | RTF_DEFAULT); 1188 if (rt) { 1189 if (del_rt) 1190 ip6_del_rt(rt); 1191 else { 1192 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1193 rt6_set_expires(rt, expires); 1194 ip6_rt_put(rt); 1195 } 1196 } 1197 } 1198 1199 1200 /* This function wants to get referenced ifp and releases it before return */ 1201 1202 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1203 { 1204 int state; 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1206 unsigned long expires; 1207 1208 ASSERT_RTNL(); 1209 1210 spin_lock_bh(&ifp->lock); 1211 state = ifp->state; 1212 ifp->state = INET6_IFADDR_STATE_DEAD; 1213 spin_unlock_bh(&ifp->lock); 1214 1215 if (state == INET6_IFADDR_STATE_DEAD) 1216 goto out; 1217 1218 spin_lock_bh(&addrconf_hash_lock); 1219 hlist_del_init_rcu(&ifp->addr_lst); 1220 spin_unlock_bh(&addrconf_hash_lock); 1221 1222 write_lock_bh(&ifp->idev->lock); 1223 1224 if (ifp->flags&IFA_F_TEMPORARY) { 1225 list_del(&ifp->tmp_list); 1226 if (ifp->ifpub) { 1227 in6_ifa_put(ifp->ifpub); 1228 ifp->ifpub = NULL; 1229 } 1230 __in6_ifa_put(ifp); 1231 } 1232 1233 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1234 action = check_cleanup_prefix_route(ifp, &expires); 1235 1236 list_del_rcu(&ifp->if_list); 1237 __in6_ifa_put(ifp); 1238 1239 write_unlock_bh(&ifp->idev->lock); 1240 1241 addrconf_del_dad_work(ifp); 1242 1243 ipv6_ifa_notify(RTM_DELADDR, ifp); 1244 1245 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1246 1247 if (action != CLEANUP_PREFIX_RT_NOP) { 1248 cleanup_prefix_route(ifp, expires, 1249 action == CLEANUP_PREFIX_RT_DEL); 1250 } 1251 1252 /* clean up prefsrc entries */ 1253 rt6_remove_prefsrc(ifp); 1254 out: 1255 in6_ifa_put(ifp); 1256 } 1257 1258 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1259 struct inet6_ifaddr *ift, 1260 bool block) 1261 { 1262 struct inet6_dev *idev = ifp->idev; 1263 struct in6_addr addr, *tmpaddr; 1264 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1265 unsigned long regen_advance; 1266 int tmp_plen; 1267 int ret = 0; 1268 u32 addr_flags; 1269 unsigned long now = jiffies; 1270 long max_desync_factor; 1271 s32 cnf_temp_preferred_lft; 1272 1273 write_lock_bh(&idev->lock); 1274 if (ift) { 1275 spin_lock_bh(&ift->lock); 1276 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1277 spin_unlock_bh(&ift->lock); 1278 tmpaddr = &addr; 1279 } else { 1280 tmpaddr = NULL; 1281 } 1282 retry: 1283 in6_dev_hold(idev); 1284 if (idev->cnf.use_tempaddr <= 0) { 1285 write_unlock_bh(&idev->lock); 1286 pr_info("%s: use_tempaddr is disabled\n", __func__); 1287 in6_dev_put(idev); 1288 ret = -1; 1289 goto out; 1290 } 1291 spin_lock_bh(&ifp->lock); 1292 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1293 idev->cnf.use_tempaddr = -1; /*XXX*/ 1294 spin_unlock_bh(&ifp->lock); 1295 write_unlock_bh(&idev->lock); 1296 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1297 __func__); 1298 in6_dev_put(idev); 1299 ret = -1; 1300 goto out; 1301 } 1302 in6_ifa_hold(ifp); 1303 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1304 ipv6_try_regen_rndid(idev, tmpaddr); 1305 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1306 age = (now - ifp->tstamp) / HZ; 1307 1308 regen_advance = idev->cnf.regen_max_retry * 1309 idev->cnf.dad_transmits * 1310 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1311 1312 /* recalculate max_desync_factor each time and update 1313 * idev->desync_factor if it's larger 1314 */ 1315 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1316 max_desync_factor = min_t(__u32, 1317 idev->cnf.max_desync_factor, 1318 cnf_temp_preferred_lft - regen_advance); 1319 1320 if (unlikely(idev->desync_factor > max_desync_factor)) { 1321 if (max_desync_factor > 0) { 1322 get_random_bytes(&idev->desync_factor, 1323 sizeof(idev->desync_factor)); 1324 idev->desync_factor %= max_desync_factor; 1325 } else { 1326 idev->desync_factor = 0; 1327 } 1328 } 1329 1330 tmp_valid_lft = min_t(__u32, 1331 ifp->valid_lft, 1332 idev->cnf.temp_valid_lft + age); 1333 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1334 idev->desync_factor; 1335 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1336 tmp_plen = ifp->prefix_len; 1337 tmp_tstamp = ifp->tstamp; 1338 spin_unlock_bh(&ifp->lock); 1339 1340 write_unlock_bh(&idev->lock); 1341 1342 /* A temporary address is created only if this calculated Preferred 1343 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1344 * an implementation must not create a temporary address with a zero 1345 * Preferred Lifetime. 1346 * Use age calculation as in addrconf_verify to avoid unnecessary 1347 * temporary addresses being generated. 1348 */ 1349 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1350 if (tmp_prefered_lft <= regen_advance + age) { 1351 in6_ifa_put(ifp); 1352 in6_dev_put(idev); 1353 ret = -1; 1354 goto out; 1355 } 1356 1357 addr_flags = IFA_F_TEMPORARY; 1358 /* set in addrconf_prefix_rcv() */ 1359 if (ifp->flags & IFA_F_OPTIMISTIC) 1360 addr_flags |= IFA_F_OPTIMISTIC; 1361 1362 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1363 ipv6_addr_scope(&addr), addr_flags, 1364 tmp_valid_lft, tmp_prefered_lft, block, NULL); 1365 if (IS_ERR(ift)) { 1366 in6_ifa_put(ifp); 1367 in6_dev_put(idev); 1368 pr_info("%s: retry temporary address regeneration\n", __func__); 1369 tmpaddr = &addr; 1370 write_lock_bh(&idev->lock); 1371 goto retry; 1372 } 1373 1374 spin_lock_bh(&ift->lock); 1375 ift->ifpub = ifp; 1376 ift->cstamp = now; 1377 ift->tstamp = tmp_tstamp; 1378 spin_unlock_bh(&ift->lock); 1379 1380 addrconf_dad_start(ift); 1381 in6_ifa_put(ift); 1382 in6_dev_put(idev); 1383 out: 1384 return ret; 1385 } 1386 1387 /* 1388 * Choose an appropriate source address (RFC3484) 1389 */ 1390 enum { 1391 IPV6_SADDR_RULE_INIT = 0, 1392 IPV6_SADDR_RULE_LOCAL, 1393 IPV6_SADDR_RULE_SCOPE, 1394 IPV6_SADDR_RULE_PREFERRED, 1395 #ifdef CONFIG_IPV6_MIP6 1396 IPV6_SADDR_RULE_HOA, 1397 #endif 1398 IPV6_SADDR_RULE_OIF, 1399 IPV6_SADDR_RULE_LABEL, 1400 IPV6_SADDR_RULE_PRIVACY, 1401 IPV6_SADDR_RULE_ORCHID, 1402 IPV6_SADDR_RULE_PREFIX, 1403 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1404 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1405 #endif 1406 IPV6_SADDR_RULE_MAX 1407 }; 1408 1409 struct ipv6_saddr_score { 1410 int rule; 1411 int addr_type; 1412 struct inet6_ifaddr *ifa; 1413 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1414 int scopedist; 1415 int matchlen; 1416 }; 1417 1418 struct ipv6_saddr_dst { 1419 const struct in6_addr *addr; 1420 int ifindex; 1421 int scope; 1422 int label; 1423 unsigned int prefs; 1424 }; 1425 1426 static inline int ipv6_saddr_preferred(int type) 1427 { 1428 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1429 return 1; 1430 return 0; 1431 } 1432 1433 static bool ipv6_use_optimistic_addr(struct net *net, 1434 struct inet6_dev *idev) 1435 { 1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1437 if (!idev) 1438 return false; 1439 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1440 return false; 1441 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1442 return false; 1443 1444 return true; 1445 #else 1446 return false; 1447 #endif 1448 } 1449 1450 static bool ipv6_allow_optimistic_dad(struct net *net, 1451 struct inet6_dev *idev) 1452 { 1453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1454 if (!idev) 1455 return false; 1456 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1457 return false; 1458 1459 return true; 1460 #else 1461 return false; 1462 #endif 1463 } 1464 1465 static int ipv6_get_saddr_eval(struct net *net, 1466 struct ipv6_saddr_score *score, 1467 struct ipv6_saddr_dst *dst, 1468 int i) 1469 { 1470 int ret; 1471 1472 if (i <= score->rule) { 1473 switch (i) { 1474 case IPV6_SADDR_RULE_SCOPE: 1475 ret = score->scopedist; 1476 break; 1477 case IPV6_SADDR_RULE_PREFIX: 1478 ret = score->matchlen; 1479 break; 1480 default: 1481 ret = !!test_bit(i, score->scorebits); 1482 } 1483 goto out; 1484 } 1485 1486 switch (i) { 1487 case IPV6_SADDR_RULE_INIT: 1488 /* Rule 0: remember if hiscore is not ready yet */ 1489 ret = !!score->ifa; 1490 break; 1491 case IPV6_SADDR_RULE_LOCAL: 1492 /* Rule 1: Prefer same address */ 1493 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1494 break; 1495 case IPV6_SADDR_RULE_SCOPE: 1496 /* Rule 2: Prefer appropriate scope 1497 * 1498 * ret 1499 * ^ 1500 * -1 | d 15 1501 * ---+--+-+---> scope 1502 * | 1503 * | d is scope of the destination. 1504 * B-d | \ 1505 * | \ <- smaller scope is better if 1506 * B-15 | \ if scope is enough for destination. 1507 * | ret = B - scope (-1 <= scope >= d <= 15). 1508 * d-C-1 | / 1509 * |/ <- greater is better 1510 * -C / if scope is not enough for destination. 1511 * /| ret = scope - C (-1 <= d < scope <= 15). 1512 * 1513 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1514 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1515 * Assume B = 0 and we get C > 29. 1516 */ 1517 ret = __ipv6_addr_src_scope(score->addr_type); 1518 if (ret >= dst->scope) 1519 ret = -ret; 1520 else 1521 ret -= 128; /* 30 is enough */ 1522 score->scopedist = ret; 1523 break; 1524 case IPV6_SADDR_RULE_PREFERRED: 1525 { 1526 /* Rule 3: Avoid deprecated and optimistic addresses */ 1527 u8 avoid = IFA_F_DEPRECATED; 1528 1529 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1530 avoid |= IFA_F_OPTIMISTIC; 1531 ret = ipv6_saddr_preferred(score->addr_type) || 1532 !(score->ifa->flags & avoid); 1533 break; 1534 } 1535 #ifdef CONFIG_IPV6_MIP6 1536 case IPV6_SADDR_RULE_HOA: 1537 { 1538 /* Rule 4: Prefer home address */ 1539 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1540 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1541 break; 1542 } 1543 #endif 1544 case IPV6_SADDR_RULE_OIF: 1545 /* Rule 5: Prefer outgoing interface */ 1546 ret = (!dst->ifindex || 1547 dst->ifindex == score->ifa->idev->dev->ifindex); 1548 break; 1549 case IPV6_SADDR_RULE_LABEL: 1550 /* Rule 6: Prefer matching label */ 1551 ret = ipv6_addr_label(net, 1552 &score->ifa->addr, score->addr_type, 1553 score->ifa->idev->dev->ifindex) == dst->label; 1554 break; 1555 case IPV6_SADDR_RULE_PRIVACY: 1556 { 1557 /* Rule 7: Prefer public address 1558 * Note: prefer temporary address if use_tempaddr >= 2 1559 */ 1560 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1561 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1562 score->ifa->idev->cnf.use_tempaddr >= 2; 1563 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1564 break; 1565 } 1566 case IPV6_SADDR_RULE_ORCHID: 1567 /* Rule 8-: Prefer ORCHID vs ORCHID or 1568 * non-ORCHID vs non-ORCHID 1569 */ 1570 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1571 ipv6_addr_orchid(dst->addr)); 1572 break; 1573 case IPV6_SADDR_RULE_PREFIX: 1574 /* Rule 8: Use longest matching prefix */ 1575 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1576 if (ret > score->ifa->prefix_len) 1577 ret = score->ifa->prefix_len; 1578 score->matchlen = ret; 1579 break; 1580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1581 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1582 /* Optimistic addresses still have lower precedence than other 1583 * preferred addresses. 1584 */ 1585 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1586 break; 1587 #endif 1588 default: 1589 ret = 0; 1590 } 1591 1592 if (ret) 1593 __set_bit(i, score->scorebits); 1594 score->rule = i; 1595 out: 1596 return ret; 1597 } 1598 1599 static int __ipv6_dev_get_saddr(struct net *net, 1600 struct ipv6_saddr_dst *dst, 1601 struct inet6_dev *idev, 1602 struct ipv6_saddr_score *scores, 1603 int hiscore_idx) 1604 { 1605 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1606 1607 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1608 int i; 1609 1610 /* 1611 * - Tentative Address (RFC2462 section 5.4) 1612 * - A tentative address is not considered 1613 * "assigned to an interface" in the traditional 1614 * sense, unless it is also flagged as optimistic. 1615 * - Candidate Source Address (section 4) 1616 * - In any case, anycast addresses, multicast 1617 * addresses, and the unspecified address MUST 1618 * NOT be included in a candidate set. 1619 */ 1620 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1621 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1622 continue; 1623 1624 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1625 1626 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1627 score->addr_type & IPV6_ADDR_MULTICAST)) { 1628 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1629 idev->dev->name); 1630 continue; 1631 } 1632 1633 score->rule = -1; 1634 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1635 1636 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1637 int minihiscore, miniscore; 1638 1639 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1640 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1641 1642 if (minihiscore > miniscore) { 1643 if (i == IPV6_SADDR_RULE_SCOPE && 1644 score->scopedist > 0) { 1645 /* 1646 * special case: 1647 * each remaining entry 1648 * has too small (not enough) 1649 * scope, because ifa entries 1650 * are sorted by their scope 1651 * values. 1652 */ 1653 goto out; 1654 } 1655 break; 1656 } else if (minihiscore < miniscore) { 1657 swap(hiscore, score); 1658 hiscore_idx = 1 - hiscore_idx; 1659 1660 /* restore our iterator */ 1661 score->ifa = hiscore->ifa; 1662 1663 break; 1664 } 1665 } 1666 } 1667 out: 1668 return hiscore_idx; 1669 } 1670 1671 static int ipv6_get_saddr_master(struct net *net, 1672 const struct net_device *dst_dev, 1673 const struct net_device *master, 1674 struct ipv6_saddr_dst *dst, 1675 struct ipv6_saddr_score *scores, 1676 int hiscore_idx) 1677 { 1678 struct inet6_dev *idev; 1679 1680 idev = __in6_dev_get(dst_dev); 1681 if (idev) 1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1683 scores, hiscore_idx); 1684 1685 idev = __in6_dev_get(master); 1686 if (idev) 1687 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1688 scores, hiscore_idx); 1689 1690 return hiscore_idx; 1691 } 1692 1693 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1694 const struct in6_addr *daddr, unsigned int prefs, 1695 struct in6_addr *saddr) 1696 { 1697 struct ipv6_saddr_score scores[2], *hiscore; 1698 struct ipv6_saddr_dst dst; 1699 struct inet6_dev *idev; 1700 struct net_device *dev; 1701 int dst_type; 1702 bool use_oif_addr = false; 1703 int hiscore_idx = 0; 1704 int ret = 0; 1705 1706 dst_type = __ipv6_addr_type(daddr); 1707 dst.addr = daddr; 1708 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1709 dst.scope = __ipv6_addr_src_scope(dst_type); 1710 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1711 dst.prefs = prefs; 1712 1713 scores[hiscore_idx].rule = -1; 1714 scores[hiscore_idx].ifa = NULL; 1715 1716 rcu_read_lock(); 1717 1718 /* Candidate Source Address (section 4) 1719 * - multicast and link-local destination address, 1720 * the set of candidate source address MUST only 1721 * include addresses assigned to interfaces 1722 * belonging to the same link as the outgoing 1723 * interface. 1724 * (- For site-local destination addresses, the 1725 * set of candidate source addresses MUST only 1726 * include addresses assigned to interfaces 1727 * belonging to the same site as the outgoing 1728 * interface.) 1729 * - "It is RECOMMENDED that the candidate source addresses 1730 * be the set of unicast addresses assigned to the 1731 * interface that will be used to send to the destination 1732 * (the 'outgoing' interface)." (RFC 6724) 1733 */ 1734 if (dst_dev) { 1735 idev = __in6_dev_get(dst_dev); 1736 if ((dst_type & IPV6_ADDR_MULTICAST) || 1737 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1738 (idev && idev->cnf.use_oif_addrs_only)) { 1739 use_oif_addr = true; 1740 } 1741 } 1742 1743 if (use_oif_addr) { 1744 if (idev) 1745 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1746 } else { 1747 const struct net_device *master; 1748 int master_idx = 0; 1749 1750 /* if dst_dev exists and is enslaved to an L3 device, then 1751 * prefer addresses from dst_dev and then the master over 1752 * any other enslaved devices in the L3 domain. 1753 */ 1754 master = l3mdev_master_dev_rcu(dst_dev); 1755 if (master) { 1756 master_idx = master->ifindex; 1757 1758 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1759 master, &dst, 1760 scores, hiscore_idx); 1761 1762 if (scores[hiscore_idx].ifa) 1763 goto out; 1764 } 1765 1766 for_each_netdev_rcu(net, dev) { 1767 /* only consider addresses on devices in the 1768 * same L3 domain 1769 */ 1770 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1771 continue; 1772 idev = __in6_dev_get(dev); 1773 if (!idev) 1774 continue; 1775 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1776 } 1777 } 1778 1779 out: 1780 hiscore = &scores[hiscore_idx]; 1781 if (!hiscore->ifa) 1782 ret = -EADDRNOTAVAIL; 1783 else 1784 *saddr = hiscore->ifa->addr; 1785 1786 rcu_read_unlock(); 1787 return ret; 1788 } 1789 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1790 1791 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1792 u32 banned_flags) 1793 { 1794 struct inet6_ifaddr *ifp; 1795 int err = -EADDRNOTAVAIL; 1796 1797 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1798 if (ifp->scope > IFA_LINK) 1799 break; 1800 if (ifp->scope == IFA_LINK && 1801 !(ifp->flags & banned_flags)) { 1802 *addr = ifp->addr; 1803 err = 0; 1804 break; 1805 } 1806 } 1807 return err; 1808 } 1809 1810 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1811 u32 banned_flags) 1812 { 1813 struct inet6_dev *idev; 1814 int err = -EADDRNOTAVAIL; 1815 1816 rcu_read_lock(); 1817 idev = __in6_dev_get(dev); 1818 if (idev) { 1819 read_lock_bh(&idev->lock); 1820 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1821 read_unlock_bh(&idev->lock); 1822 } 1823 rcu_read_unlock(); 1824 return err; 1825 } 1826 1827 static int ipv6_count_addresses(const struct inet6_dev *idev) 1828 { 1829 const struct inet6_ifaddr *ifp; 1830 int cnt = 0; 1831 1832 rcu_read_lock(); 1833 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1834 cnt++; 1835 rcu_read_unlock(); 1836 return cnt; 1837 } 1838 1839 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1840 const struct net_device *dev, int strict) 1841 { 1842 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1843 strict, IFA_F_TENTATIVE); 1844 } 1845 EXPORT_SYMBOL(ipv6_chk_addr); 1846 1847 /* device argument is used to find the L3 domain of interest. If 1848 * skip_dev_check is set, then the ifp device is not checked against 1849 * the passed in dev argument. So the 2 cases for addresses checks are: 1850 * 1. does the address exist in the L3 domain that dev is part of 1851 * (skip_dev_check = true), or 1852 * 1853 * 2. does the address exist on the specific device 1854 * (skip_dev_check = false) 1855 */ 1856 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1857 const struct net_device *dev, bool skip_dev_check, 1858 int strict, u32 banned_flags) 1859 { 1860 unsigned int hash = inet6_addr_hash(net, addr); 1861 const struct net_device *l3mdev; 1862 struct inet6_ifaddr *ifp; 1863 u32 ifp_flags; 1864 1865 rcu_read_lock(); 1866 1867 l3mdev = l3mdev_master_dev_rcu(dev); 1868 if (skip_dev_check) 1869 dev = NULL; 1870 1871 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1872 if (!net_eq(dev_net(ifp->idev->dev), net)) 1873 continue; 1874 1875 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1876 continue; 1877 1878 /* Decouple optimistic from tentative for evaluation here. 1879 * Ban optimistic addresses explicitly, when required. 1880 */ 1881 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1882 ? (ifp->flags&~IFA_F_TENTATIVE) 1883 : ifp->flags; 1884 if (ipv6_addr_equal(&ifp->addr, addr) && 1885 !(ifp_flags&banned_flags) && 1886 (!dev || ifp->idev->dev == dev || 1887 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1888 rcu_read_unlock(); 1889 return 1; 1890 } 1891 } 1892 1893 rcu_read_unlock(); 1894 return 0; 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1897 1898 1899 /* Compares an address/prefix_len with addresses on device @dev. 1900 * If one is found it returns true. 1901 */ 1902 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1903 const unsigned int prefix_len, struct net_device *dev) 1904 { 1905 const struct inet6_ifaddr *ifa; 1906 const struct inet6_dev *idev; 1907 bool ret = false; 1908 1909 rcu_read_lock(); 1910 idev = __in6_dev_get(dev); 1911 if (idev) { 1912 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1913 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1914 if (ret) 1915 break; 1916 } 1917 } 1918 rcu_read_unlock(); 1919 1920 return ret; 1921 } 1922 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1923 1924 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1925 { 1926 const struct inet6_ifaddr *ifa; 1927 const struct inet6_dev *idev; 1928 int onlink; 1929 1930 onlink = 0; 1931 rcu_read_lock(); 1932 idev = __in6_dev_get(dev); 1933 if (idev) { 1934 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1935 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1936 ifa->prefix_len); 1937 if (onlink) 1938 break; 1939 } 1940 } 1941 rcu_read_unlock(); 1942 return onlink; 1943 } 1944 EXPORT_SYMBOL(ipv6_chk_prefix); 1945 1946 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1947 struct net_device *dev, int strict) 1948 { 1949 unsigned int hash = inet6_addr_hash(net, addr); 1950 struct inet6_ifaddr *ifp, *result = NULL; 1951 1952 rcu_read_lock(); 1953 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1954 if (!net_eq(dev_net(ifp->idev->dev), net)) 1955 continue; 1956 if (ipv6_addr_equal(&ifp->addr, addr)) { 1957 if (!dev || ifp->idev->dev == dev || 1958 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1959 result = ifp; 1960 in6_ifa_hold(ifp); 1961 break; 1962 } 1963 } 1964 } 1965 rcu_read_unlock(); 1966 1967 return result; 1968 } 1969 1970 /* Gets referenced address, destroys ifaddr */ 1971 1972 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1973 { 1974 if (dad_failed) 1975 ifp->flags |= IFA_F_DADFAILED; 1976 1977 if (ifp->flags&IFA_F_TEMPORARY) { 1978 struct inet6_ifaddr *ifpub; 1979 spin_lock_bh(&ifp->lock); 1980 ifpub = ifp->ifpub; 1981 if (ifpub) { 1982 in6_ifa_hold(ifpub); 1983 spin_unlock_bh(&ifp->lock); 1984 ipv6_create_tempaddr(ifpub, ifp, true); 1985 in6_ifa_put(ifpub); 1986 } else { 1987 spin_unlock_bh(&ifp->lock); 1988 } 1989 ipv6_del_addr(ifp); 1990 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1991 spin_lock_bh(&ifp->lock); 1992 addrconf_del_dad_work(ifp); 1993 ifp->flags |= IFA_F_TENTATIVE; 1994 if (dad_failed) 1995 ifp->flags &= ~IFA_F_OPTIMISTIC; 1996 spin_unlock_bh(&ifp->lock); 1997 if (dad_failed) 1998 ipv6_ifa_notify(0, ifp); 1999 in6_ifa_put(ifp); 2000 } else { 2001 ipv6_del_addr(ifp); 2002 } 2003 } 2004 2005 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2006 { 2007 int err = -ENOENT; 2008 2009 spin_lock_bh(&ifp->lock); 2010 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2011 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2012 err = 0; 2013 } 2014 spin_unlock_bh(&ifp->lock); 2015 2016 return err; 2017 } 2018 2019 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2020 { 2021 struct inet6_dev *idev = ifp->idev; 2022 struct net *net = dev_net(ifp->idev->dev); 2023 2024 if (addrconf_dad_end(ifp)) { 2025 in6_ifa_put(ifp); 2026 return; 2027 } 2028 2029 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2030 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2031 2032 spin_lock_bh(&ifp->lock); 2033 2034 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2035 int scope = ifp->scope; 2036 u32 flags = ifp->flags; 2037 struct in6_addr new_addr; 2038 struct inet6_ifaddr *ifp2; 2039 u32 valid_lft, preferred_lft; 2040 int pfxlen = ifp->prefix_len; 2041 int retries = ifp->stable_privacy_retry + 1; 2042 2043 if (retries > net->ipv6.sysctl.idgen_retries) { 2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2045 ifp->idev->dev->name); 2046 goto errdad; 2047 } 2048 2049 new_addr = ifp->addr; 2050 if (ipv6_generate_stable_address(&new_addr, retries, 2051 idev)) 2052 goto errdad; 2053 2054 valid_lft = ifp->valid_lft; 2055 preferred_lft = ifp->prefered_lft; 2056 2057 spin_unlock_bh(&ifp->lock); 2058 2059 if (idev->cnf.max_addresses && 2060 ipv6_count_addresses(idev) >= 2061 idev->cnf.max_addresses) 2062 goto lock_errdad; 2063 2064 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2065 ifp->idev->dev->name); 2066 2067 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2068 scope, flags, valid_lft, 2069 preferred_lft, false, NULL); 2070 if (IS_ERR(ifp2)) 2071 goto lock_errdad; 2072 2073 spin_lock_bh(&ifp2->lock); 2074 ifp2->stable_privacy_retry = retries; 2075 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2076 spin_unlock_bh(&ifp2->lock); 2077 2078 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2079 in6_ifa_put(ifp2); 2080 lock_errdad: 2081 spin_lock_bh(&ifp->lock); 2082 } 2083 2084 errdad: 2085 /* transition from _POSTDAD to _ERRDAD */ 2086 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2087 spin_unlock_bh(&ifp->lock); 2088 2089 addrconf_mod_dad_work(ifp, 0); 2090 in6_ifa_put(ifp); 2091 } 2092 2093 /* Join to solicited addr multicast group. 2094 * caller must hold RTNL */ 2095 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2096 { 2097 struct in6_addr maddr; 2098 2099 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2100 return; 2101 2102 addrconf_addr_solict_mult(addr, &maddr); 2103 ipv6_dev_mc_inc(dev, &maddr); 2104 } 2105 2106 /* caller must hold RTNL */ 2107 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2108 { 2109 struct in6_addr maddr; 2110 2111 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2112 return; 2113 2114 addrconf_addr_solict_mult(addr, &maddr); 2115 __ipv6_dev_mc_dec(idev, &maddr); 2116 } 2117 2118 /* caller must hold RTNL */ 2119 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2120 { 2121 struct in6_addr addr; 2122 2123 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2124 return; 2125 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2126 if (ipv6_addr_any(&addr)) 2127 return; 2128 __ipv6_dev_ac_inc(ifp->idev, &addr); 2129 } 2130 2131 /* caller must hold RTNL */ 2132 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2133 { 2134 struct in6_addr addr; 2135 2136 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2137 return; 2138 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2139 if (ipv6_addr_any(&addr)) 2140 return; 2141 __ipv6_dev_ac_dec(ifp->idev, &addr); 2142 } 2143 2144 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2145 { 2146 switch (dev->addr_len) { 2147 case ETH_ALEN: 2148 memcpy(eui, dev->dev_addr, 3); 2149 eui[3] = 0xFF; 2150 eui[4] = 0xFE; 2151 memcpy(eui + 5, dev->dev_addr + 3, 3); 2152 break; 2153 case EUI64_ADDR_LEN: 2154 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2155 eui[0] ^= 2; 2156 break; 2157 default: 2158 return -1; 2159 } 2160 2161 return 0; 2162 } 2163 2164 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2165 { 2166 union fwnet_hwaddr *ha; 2167 2168 if (dev->addr_len != FWNET_ALEN) 2169 return -1; 2170 2171 ha = (union fwnet_hwaddr *)dev->dev_addr; 2172 2173 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2174 eui[0] ^= 2; 2175 return 0; 2176 } 2177 2178 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2179 { 2180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2181 if (dev->addr_len != ARCNET_ALEN) 2182 return -1; 2183 memset(eui, 0, 7); 2184 eui[7] = *(u8 *)dev->dev_addr; 2185 return 0; 2186 } 2187 2188 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2189 { 2190 if (dev->addr_len != INFINIBAND_ALEN) 2191 return -1; 2192 memcpy(eui, dev->dev_addr + 12, 8); 2193 eui[0] |= 2; 2194 return 0; 2195 } 2196 2197 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2198 { 2199 if (addr == 0) 2200 return -1; 2201 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2202 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2203 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2204 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2205 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2206 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2207 eui[1] = 0; 2208 eui[2] = 0x5E; 2209 eui[3] = 0xFE; 2210 memcpy(eui + 4, &addr, 4); 2211 return 0; 2212 } 2213 2214 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2215 { 2216 if (dev->priv_flags & IFF_ISATAP) 2217 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2218 return -1; 2219 } 2220 2221 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2222 { 2223 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2224 } 2225 2226 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2227 { 2228 memcpy(eui, dev->perm_addr, 3); 2229 memcpy(eui + 5, dev->perm_addr + 3, 3); 2230 eui[3] = 0xFF; 2231 eui[4] = 0xFE; 2232 eui[0] ^= 2; 2233 return 0; 2234 } 2235 2236 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2237 { 2238 switch (dev->type) { 2239 case ARPHRD_ETHER: 2240 case ARPHRD_FDDI: 2241 return addrconf_ifid_eui48(eui, dev); 2242 case ARPHRD_ARCNET: 2243 return addrconf_ifid_arcnet(eui, dev); 2244 case ARPHRD_INFINIBAND: 2245 return addrconf_ifid_infiniband(eui, dev); 2246 case ARPHRD_SIT: 2247 return addrconf_ifid_sit(eui, dev); 2248 case ARPHRD_IPGRE: 2249 case ARPHRD_TUNNEL: 2250 return addrconf_ifid_gre(eui, dev); 2251 case ARPHRD_6LOWPAN: 2252 return addrconf_ifid_6lowpan(eui, dev); 2253 case ARPHRD_IEEE1394: 2254 return addrconf_ifid_ieee1394(eui, dev); 2255 case ARPHRD_TUNNEL6: 2256 case ARPHRD_IP6GRE: 2257 return addrconf_ifid_ip6tnl(eui, dev); 2258 } 2259 return -1; 2260 } 2261 2262 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2263 { 2264 int err = -1; 2265 struct inet6_ifaddr *ifp; 2266 2267 read_lock_bh(&idev->lock); 2268 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2269 if (ifp->scope > IFA_LINK) 2270 break; 2271 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2272 memcpy(eui, ifp->addr.s6_addr+8, 8); 2273 err = 0; 2274 break; 2275 } 2276 } 2277 read_unlock_bh(&idev->lock); 2278 return err; 2279 } 2280 2281 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2282 static void ipv6_regen_rndid(struct inet6_dev *idev) 2283 { 2284 regen: 2285 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2286 idev->rndid[0] &= ~0x02; 2287 2288 /* 2289 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2290 * check if generated address is not inappropriate 2291 * 2292 * - Reserved subnet anycast (RFC 2526) 2293 * 11111101 11....11 1xxxxxxx 2294 * - ISATAP (RFC4214) 6.1 2295 * 00-00-5E-FE-xx-xx-xx-xx 2296 * - value 0 2297 * - XXX: already assigned to an address on the device 2298 */ 2299 if (idev->rndid[0] == 0xfd && 2300 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2301 (idev->rndid[7]&0x80)) 2302 goto regen; 2303 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2304 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2305 goto regen; 2306 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2307 goto regen; 2308 } 2309 } 2310 2311 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2312 { 2313 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2314 ipv6_regen_rndid(idev); 2315 } 2316 2317 /* 2318 * Add prefix route. 2319 */ 2320 2321 static void 2322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2323 unsigned long expires, u32 flags) 2324 { 2325 struct fib6_config cfg = { 2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2327 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2328 .fc_ifindex = dev->ifindex, 2329 .fc_expires = expires, 2330 .fc_dst_len = plen, 2331 .fc_flags = RTF_UP | flags, 2332 .fc_nlinfo.nl_net = dev_net(dev), 2333 .fc_protocol = RTPROT_KERNEL, 2334 }; 2335 2336 cfg.fc_dst = *pfx; 2337 2338 /* Prevent useless cloning on PtP SIT. 2339 This thing is done here expecting that the whole 2340 class of non-broadcast devices need not cloning. 2341 */ 2342 #if IS_ENABLED(CONFIG_IPV6_SIT) 2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2344 cfg.fc_flags |= RTF_NONEXTHOP; 2345 #endif 2346 2347 ip6_route_add(&cfg, NULL); 2348 } 2349 2350 2351 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2352 int plen, 2353 const struct net_device *dev, 2354 u32 flags, u32 noflags) 2355 { 2356 struct fib6_node *fn; 2357 struct rt6_info *rt = NULL; 2358 struct fib6_table *table; 2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2360 2361 table = fib6_get_table(dev_net(dev), tb_id); 2362 if (!table) 2363 return NULL; 2364 2365 rcu_read_lock(); 2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2367 if (!fn) 2368 goto out; 2369 2370 for_each_fib6_node_rt_rcu(fn) { 2371 if (rt->dst.dev->ifindex != dev->ifindex) 2372 continue; 2373 if ((rt->rt6i_flags & flags) != flags) 2374 continue; 2375 if ((rt->rt6i_flags & noflags) != 0) 2376 continue; 2377 if (!dst_hold_safe(&rt->dst)) 2378 rt = NULL; 2379 break; 2380 } 2381 out: 2382 rcu_read_unlock(); 2383 return rt; 2384 } 2385 2386 2387 /* Create "default" multicast route to the interface */ 2388 2389 static void addrconf_add_mroute(struct net_device *dev) 2390 { 2391 struct fib6_config cfg = { 2392 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2393 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2394 .fc_ifindex = dev->ifindex, 2395 .fc_dst_len = 8, 2396 .fc_flags = RTF_UP, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2512 if ((net->ipv6.devconf_all->optimistic_dad || 2513 in6_dev->cnf.optimistic_dad) && 2514 !net->ipv6.devconf_all->forwarding && sllao) 2515 addr_flags |= IFA_F_OPTIMISTIC; 2516 #endif 2517 2518 /* Do not allow to create too much of autoconfigured 2519 * addresses; this would be too easy way to crash kernel. 2520 */ 2521 if (!max_addresses || 2522 ipv6_count_addresses(in6_dev) < max_addresses) 2523 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2524 pinfo->prefix_len, 2525 addr_type&IPV6_ADDR_SCOPE_MASK, 2526 addr_flags, valid_lft, 2527 prefered_lft, false, NULL); 2528 2529 if (IS_ERR_OR_NULL(ifp)) 2530 return -1; 2531 2532 update_lft = 0; 2533 create = 1; 2534 spin_lock_bh(&ifp->lock); 2535 ifp->flags |= IFA_F_MANAGETEMPADDR; 2536 ifp->cstamp = jiffies; 2537 ifp->tokenized = tokenized; 2538 spin_unlock_bh(&ifp->lock); 2539 addrconf_dad_start(ifp); 2540 } 2541 2542 if (ifp) { 2543 u32 flags; 2544 unsigned long now; 2545 u32 stored_lft; 2546 2547 /* update lifetime (RFC2462 5.5.3 e) */ 2548 spin_lock_bh(&ifp->lock); 2549 now = jiffies; 2550 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2551 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2552 else 2553 stored_lft = 0; 2554 if (!update_lft && !create && stored_lft) { 2555 const u32 minimum_lft = min_t(u32, 2556 stored_lft, MIN_VALID_LIFETIME); 2557 valid_lft = max(valid_lft, minimum_lft); 2558 2559 /* RFC4862 Section 5.5.3e: 2560 * "Note that the preferred lifetime of the 2561 * corresponding address is always reset to 2562 * the Preferred Lifetime in the received 2563 * Prefix Information option, regardless of 2564 * whether the valid lifetime is also reset or 2565 * ignored." 2566 * 2567 * So we should always update prefered_lft here. 2568 */ 2569 update_lft = 1; 2570 } 2571 2572 if (update_lft) { 2573 ifp->valid_lft = valid_lft; 2574 ifp->prefered_lft = prefered_lft; 2575 ifp->tstamp = now; 2576 flags = ifp->flags; 2577 ifp->flags &= ~IFA_F_DEPRECATED; 2578 spin_unlock_bh(&ifp->lock); 2579 2580 if (!(flags&IFA_F_TENTATIVE)) 2581 ipv6_ifa_notify(0, ifp); 2582 } else 2583 spin_unlock_bh(&ifp->lock); 2584 2585 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2586 create, now); 2587 2588 in6_ifa_put(ifp); 2589 addrconf_verify(); 2590 } 2591 2592 return 0; 2593 } 2594 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2595 2596 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2597 { 2598 struct prefix_info *pinfo; 2599 __u32 valid_lft; 2600 __u32 prefered_lft; 2601 int addr_type, err; 2602 u32 addr_flags = 0; 2603 struct inet6_dev *in6_dev; 2604 struct net *net = dev_net(dev); 2605 2606 pinfo = (struct prefix_info *) opt; 2607 2608 if (len < sizeof(struct prefix_info)) { 2609 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2610 return; 2611 } 2612 2613 /* 2614 * Validation checks ([ADDRCONF], page 19) 2615 */ 2616 2617 addr_type = ipv6_addr_type(&pinfo->prefix); 2618 2619 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2620 return; 2621 2622 valid_lft = ntohl(pinfo->valid); 2623 prefered_lft = ntohl(pinfo->prefered); 2624 2625 if (prefered_lft > valid_lft) { 2626 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2627 return; 2628 } 2629 2630 in6_dev = in6_dev_get(dev); 2631 2632 if (!in6_dev) { 2633 net_dbg_ratelimited("addrconf: device %s not configured\n", 2634 dev->name); 2635 return; 2636 } 2637 2638 /* 2639 * Two things going on here: 2640 * 1) Add routes for on-link prefixes 2641 * 2) Configure prefixes with the auto flag set 2642 */ 2643 2644 if (pinfo->onlink) { 2645 struct rt6_info *rt; 2646 unsigned long rt_expires; 2647 2648 /* Avoid arithmetic overflow. Really, we could 2649 * save rt_expires in seconds, likely valid_lft, 2650 * but it would require division in fib gc, that it 2651 * not good. 2652 */ 2653 if (HZ > USER_HZ) 2654 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2655 else 2656 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2657 2658 if (addrconf_finite_timeout(rt_expires)) 2659 rt_expires *= HZ; 2660 2661 rt = addrconf_get_prefix_route(&pinfo->prefix, 2662 pinfo->prefix_len, 2663 dev, 2664 RTF_ADDRCONF | RTF_PREFIX_RT, 2665 RTF_GATEWAY | RTF_DEFAULT); 2666 2667 if (rt) { 2668 /* Autoconf prefix route */ 2669 if (valid_lft == 0) { 2670 ip6_del_rt(rt); 2671 rt = NULL; 2672 } else if (addrconf_finite_timeout(rt_expires)) { 2673 /* not infinity */ 2674 rt6_set_expires(rt, jiffies + rt_expires); 2675 } else { 2676 rt6_clean_expires(rt); 2677 } 2678 } else if (valid_lft) { 2679 clock_t expires = 0; 2680 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2681 if (addrconf_finite_timeout(rt_expires)) { 2682 /* not infinity */ 2683 flags |= RTF_EXPIRES; 2684 expires = jiffies_to_clock_t(rt_expires); 2685 } 2686 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2687 dev, expires, flags); 2688 } 2689 ip6_rt_put(rt); 2690 } 2691 2692 /* Try to figure out our local address for this prefix */ 2693 2694 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2695 struct in6_addr addr; 2696 bool tokenized = false, dev_addr_generated = false; 2697 2698 if (pinfo->prefix_len == 64) { 2699 memcpy(&addr, &pinfo->prefix, 8); 2700 2701 if (!ipv6_addr_any(&in6_dev->token)) { 2702 read_lock_bh(&in6_dev->lock); 2703 memcpy(addr.s6_addr + 8, 2704 in6_dev->token.s6_addr + 8, 8); 2705 read_unlock_bh(&in6_dev->lock); 2706 tokenized = true; 2707 } else if (is_addr_mode_generate_stable(in6_dev) && 2708 !ipv6_generate_stable_address(&addr, 0, 2709 in6_dev)) { 2710 addr_flags |= IFA_F_STABLE_PRIVACY; 2711 goto ok; 2712 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2713 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2714 goto put; 2715 } else { 2716 dev_addr_generated = true; 2717 } 2718 goto ok; 2719 } 2720 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2721 pinfo->prefix_len); 2722 goto put; 2723 2724 ok: 2725 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2726 &addr, addr_type, 2727 addr_flags, sllao, 2728 tokenized, valid_lft, 2729 prefered_lft); 2730 if (err) 2731 goto put; 2732 2733 /* Ignore error case here because previous prefix add addr was 2734 * successful which will be notified. 2735 */ 2736 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2737 addr_type, addr_flags, sllao, 2738 tokenized, valid_lft, 2739 prefered_lft, 2740 dev_addr_generated); 2741 } 2742 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2743 put: 2744 in6_dev_put(in6_dev); 2745 } 2746 2747 /* 2748 * Set destination address. 2749 * Special case for SIT interfaces where we create a new "virtual" 2750 * device. 2751 */ 2752 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2753 { 2754 struct in6_ifreq ireq; 2755 struct net_device *dev; 2756 int err = -EINVAL; 2757 2758 rtnl_lock(); 2759 2760 err = -EFAULT; 2761 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2762 goto err_exit; 2763 2764 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2765 2766 err = -ENODEV; 2767 if (!dev) 2768 goto err_exit; 2769 2770 #if IS_ENABLED(CONFIG_IPV6_SIT) 2771 if (dev->type == ARPHRD_SIT) { 2772 const struct net_device_ops *ops = dev->netdev_ops; 2773 struct ifreq ifr; 2774 struct ip_tunnel_parm p; 2775 2776 err = -EADDRNOTAVAIL; 2777 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2778 goto err_exit; 2779 2780 memset(&p, 0, sizeof(p)); 2781 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2782 p.iph.saddr = 0; 2783 p.iph.version = 4; 2784 p.iph.ihl = 5; 2785 p.iph.protocol = IPPROTO_IPV6; 2786 p.iph.ttl = 64; 2787 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2788 2789 if (ops->ndo_do_ioctl) { 2790 mm_segment_t oldfs = get_fs(); 2791 2792 set_fs(KERNEL_DS); 2793 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2794 set_fs(oldfs); 2795 } else 2796 err = -EOPNOTSUPP; 2797 2798 if (err == 0) { 2799 err = -ENOBUFS; 2800 dev = __dev_get_by_name(net, p.name); 2801 if (!dev) 2802 goto err_exit; 2803 err = dev_open(dev); 2804 } 2805 } 2806 #endif 2807 2808 err_exit: 2809 rtnl_unlock(); 2810 return err; 2811 } 2812 2813 static int ipv6_mc_config(struct sock *sk, bool join, 2814 const struct in6_addr *addr, int ifindex) 2815 { 2816 int ret; 2817 2818 ASSERT_RTNL(); 2819 2820 lock_sock(sk); 2821 if (join) 2822 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2823 else 2824 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2825 release_sock(sk); 2826 2827 return ret; 2828 } 2829 2830 /* 2831 * Manual configuration of address on an interface 2832 */ 2833 static int inet6_addr_add(struct net *net, int ifindex, 2834 const struct in6_addr *pfx, 2835 const struct in6_addr *peer_pfx, 2836 unsigned int plen, __u32 ifa_flags, 2837 __u32 prefered_lft, __u32 valid_lft, 2838 struct netlink_ext_ack *extack) 2839 { 2840 struct inet6_ifaddr *ifp; 2841 struct inet6_dev *idev; 2842 struct net_device *dev; 2843 unsigned long timeout; 2844 clock_t expires; 2845 int scope; 2846 u32 flags; 2847 2848 ASSERT_RTNL(); 2849 2850 if (plen > 128) 2851 return -EINVAL; 2852 2853 /* check the lifetime */ 2854 if (!valid_lft || prefered_lft > valid_lft) 2855 return -EINVAL; 2856 2857 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2858 return -EINVAL; 2859 2860 dev = __dev_get_by_index(net, ifindex); 2861 if (!dev) 2862 return -ENODEV; 2863 2864 idev = addrconf_add_dev(dev); 2865 if (IS_ERR(idev)) 2866 return PTR_ERR(idev); 2867 2868 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2870 true, pfx, ifindex); 2871 2872 if (ret < 0) 2873 return ret; 2874 } 2875 2876 scope = ipv6_addr_scope(pfx); 2877 2878 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2879 if (addrconf_finite_timeout(timeout)) { 2880 expires = jiffies_to_clock_t(timeout * HZ); 2881 valid_lft = timeout; 2882 flags = RTF_EXPIRES; 2883 } else { 2884 expires = 0; 2885 flags = 0; 2886 ifa_flags |= IFA_F_PERMANENT; 2887 } 2888 2889 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2890 if (addrconf_finite_timeout(timeout)) { 2891 if (timeout == 0) 2892 ifa_flags |= IFA_F_DEPRECATED; 2893 prefered_lft = timeout; 2894 } 2895 2896 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2897 valid_lft, prefered_lft, true, extack); 2898 2899 if (!IS_ERR(ifp)) { 2900 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2901 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2902 expires, flags); 2903 } 2904 2905 /* 2906 * Note that section 3.1 of RFC 4429 indicates 2907 * that the Optimistic flag should not be set for 2908 * manually configured addresses 2909 */ 2910 addrconf_dad_start(ifp); 2911 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2912 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2913 true, jiffies); 2914 in6_ifa_put(ifp); 2915 addrconf_verify_rtnl(); 2916 return 0; 2917 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2918 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2919 false, pfx, ifindex); 2920 } 2921 2922 return PTR_ERR(ifp); 2923 } 2924 2925 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2926 const struct in6_addr *pfx, unsigned int plen) 2927 { 2928 struct inet6_ifaddr *ifp; 2929 struct inet6_dev *idev; 2930 struct net_device *dev; 2931 2932 if (plen > 128) 2933 return -EINVAL; 2934 2935 dev = __dev_get_by_index(net, ifindex); 2936 if (!dev) 2937 return -ENODEV; 2938 2939 idev = __in6_dev_get(dev); 2940 if (!idev) 2941 return -ENXIO; 2942 2943 read_lock_bh(&idev->lock); 2944 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2945 if (ifp->prefix_len == plen && 2946 ipv6_addr_equal(pfx, &ifp->addr)) { 2947 in6_ifa_hold(ifp); 2948 read_unlock_bh(&idev->lock); 2949 2950 if (!(ifp->flags & IFA_F_TEMPORARY) && 2951 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2952 manage_tempaddrs(idev, ifp, 0, 0, false, 2953 jiffies); 2954 ipv6_del_addr(ifp); 2955 addrconf_verify_rtnl(); 2956 if (ipv6_addr_is_multicast(pfx)) { 2957 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2958 false, pfx, dev->ifindex); 2959 } 2960 return 0; 2961 } 2962 } 2963 read_unlock_bh(&idev->lock); 2964 return -EADDRNOTAVAIL; 2965 } 2966 2967 2968 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2969 { 2970 struct in6_ifreq ireq; 2971 int err; 2972 2973 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2974 return -EPERM; 2975 2976 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2977 return -EFAULT; 2978 2979 rtnl_lock(); 2980 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2981 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2982 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2983 rtnl_unlock(); 2984 return err; 2985 } 2986 2987 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2988 { 2989 struct in6_ifreq ireq; 2990 int err; 2991 2992 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2993 return -EPERM; 2994 2995 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2996 return -EFAULT; 2997 2998 rtnl_lock(); 2999 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3000 ireq.ifr6_prefixlen); 3001 rtnl_unlock(); 3002 return err; 3003 } 3004 3005 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3006 int plen, int scope) 3007 { 3008 struct inet6_ifaddr *ifp; 3009 3010 ifp = ipv6_add_addr(idev, addr, NULL, plen, 3011 scope, IFA_F_PERMANENT, 3012 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 3013 true, NULL); 3014 if (!IS_ERR(ifp)) { 3015 spin_lock_bh(&ifp->lock); 3016 ifp->flags &= ~IFA_F_TENTATIVE; 3017 spin_unlock_bh(&ifp->lock); 3018 rt_genid_bump_ipv6(dev_net(idev->dev)); 3019 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3020 in6_ifa_put(ifp); 3021 } 3022 } 3023 3024 #if IS_ENABLED(CONFIG_IPV6_SIT) 3025 static void sit_add_v4_addrs(struct inet6_dev *idev) 3026 { 3027 struct in6_addr addr; 3028 struct net_device *dev; 3029 struct net *net = dev_net(idev->dev); 3030 int scope, plen; 3031 u32 pflags = 0; 3032 3033 ASSERT_RTNL(); 3034 3035 memset(&addr, 0, sizeof(struct in6_addr)); 3036 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3037 3038 if (idev->dev->flags&IFF_POINTOPOINT) { 3039 addr.s6_addr32[0] = htonl(0xfe800000); 3040 scope = IFA_LINK; 3041 plen = 64; 3042 } else { 3043 scope = IPV6_ADDR_COMPATv4; 3044 plen = 96; 3045 pflags |= RTF_NONEXTHOP; 3046 } 3047 3048 if (addr.s6_addr32[3]) { 3049 add_addr(idev, &addr, plen, scope); 3050 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3051 return; 3052 } 3053 3054 for_each_netdev(net, dev) { 3055 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3056 if (in_dev && (dev->flags & IFF_UP)) { 3057 struct in_ifaddr *ifa; 3058 3059 int flag = scope; 3060 3061 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3062 3063 addr.s6_addr32[3] = ifa->ifa_local; 3064 3065 if (ifa->ifa_scope == RT_SCOPE_LINK) 3066 continue; 3067 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3068 if (idev->dev->flags&IFF_POINTOPOINT) 3069 continue; 3070 flag |= IFA_HOST; 3071 } 3072 3073 add_addr(idev, &addr, plen, flag); 3074 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3075 pflags); 3076 } 3077 } 3078 } 3079 } 3080 #endif 3081 3082 static void init_loopback(struct net_device *dev) 3083 { 3084 struct inet6_dev *idev; 3085 3086 /* ::1 */ 3087 3088 ASSERT_RTNL(); 3089 3090 idev = ipv6_find_idev(dev); 3091 if (!idev) { 3092 pr_debug("%s: add_dev failed\n", __func__); 3093 return; 3094 } 3095 3096 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3097 } 3098 3099 void addrconf_add_linklocal(struct inet6_dev *idev, 3100 const struct in6_addr *addr, u32 flags) 3101 { 3102 struct inet6_ifaddr *ifp; 3103 u32 addr_flags = flags | IFA_F_PERMANENT; 3104 3105 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3106 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3107 idev->cnf.optimistic_dad) && 3108 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3109 addr_flags |= IFA_F_OPTIMISTIC; 3110 #endif 3111 3112 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3114 if (!IS_ERR(ifp)) { 3115 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3116 addrconf_dad_start(ifp); 3117 in6_ifa_put(ifp); 3118 } 3119 } 3120 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3121 3122 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3123 { 3124 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3125 return true; 3126 3127 if (address.s6_addr32[2] == htonl(0x02005eff) && 3128 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3129 return true; 3130 3131 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3132 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3133 return true; 3134 3135 return false; 3136 } 3137 3138 static int ipv6_generate_stable_address(struct in6_addr *address, 3139 u8 dad_count, 3140 const struct inet6_dev *idev) 3141 { 3142 static DEFINE_SPINLOCK(lock); 3143 static __u32 digest[SHA_DIGEST_WORDS]; 3144 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3145 3146 static union { 3147 char __data[SHA_MESSAGE_BYTES]; 3148 struct { 3149 struct in6_addr secret; 3150 __be32 prefix[2]; 3151 unsigned char hwaddr[MAX_ADDR_LEN]; 3152 u8 dad_count; 3153 } __packed; 3154 } data; 3155 3156 struct in6_addr secret; 3157 struct in6_addr temp; 3158 struct net *net = dev_net(idev->dev); 3159 3160 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3161 3162 if (idev->cnf.stable_secret.initialized) 3163 secret = idev->cnf.stable_secret.secret; 3164 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3165 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3166 else 3167 return -1; 3168 3169 retry: 3170 spin_lock_bh(&lock); 3171 3172 sha_init(digest); 3173 memset(&data, 0, sizeof(data)); 3174 memset(workspace, 0, sizeof(workspace)); 3175 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3176 data.prefix[0] = address->s6_addr32[0]; 3177 data.prefix[1] = address->s6_addr32[1]; 3178 data.secret = secret; 3179 data.dad_count = dad_count; 3180 3181 sha_transform(digest, data.__data, workspace); 3182 3183 temp = *address; 3184 temp.s6_addr32[2] = (__force __be32)digest[0]; 3185 temp.s6_addr32[3] = (__force __be32)digest[1]; 3186 3187 spin_unlock_bh(&lock); 3188 3189 if (ipv6_reserved_interfaceid(temp)) { 3190 dad_count++; 3191 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3192 return -1; 3193 goto retry; 3194 } 3195 3196 *address = temp; 3197 return 0; 3198 } 3199 3200 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3201 { 3202 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3203 3204 if (s->initialized) 3205 return; 3206 s = &idev->cnf.stable_secret; 3207 get_random_bytes(&s->secret, sizeof(s->secret)); 3208 s->initialized = true; 3209 } 3210 3211 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3212 { 3213 struct in6_addr addr; 3214 3215 /* no link local addresses on L3 master devices */ 3216 if (netif_is_l3_master(idev->dev)) 3217 return; 3218 3219 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3220 3221 switch (idev->cnf.addr_gen_mode) { 3222 case IN6_ADDR_GEN_MODE_RANDOM: 3223 ipv6_gen_mode_random_init(idev); 3224 /* fallthrough */ 3225 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3226 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3227 addrconf_add_linklocal(idev, &addr, 3228 IFA_F_STABLE_PRIVACY); 3229 else if (prefix_route) 3230 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3231 break; 3232 case IN6_ADDR_GEN_MODE_EUI64: 3233 /* addrconf_add_linklocal also adds a prefix_route and we 3234 * only need to care about prefix routes if ipv6_generate_eui64 3235 * couldn't generate one. 3236 */ 3237 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3238 addrconf_add_linklocal(idev, &addr, 0); 3239 else if (prefix_route) 3240 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3241 break; 3242 case IN6_ADDR_GEN_MODE_NONE: 3243 default: 3244 /* will not add any link local address */ 3245 break; 3246 } 3247 } 3248 3249 static void addrconf_dev_config(struct net_device *dev) 3250 { 3251 struct inet6_dev *idev; 3252 3253 ASSERT_RTNL(); 3254 3255 if ((dev->type != ARPHRD_ETHER) && 3256 (dev->type != ARPHRD_FDDI) && 3257 (dev->type != ARPHRD_ARCNET) && 3258 (dev->type != ARPHRD_INFINIBAND) && 3259 (dev->type != ARPHRD_IEEE1394) && 3260 (dev->type != ARPHRD_TUNNEL6) && 3261 (dev->type != ARPHRD_6LOWPAN) && 3262 (dev->type != ARPHRD_IP6GRE) && 3263 (dev->type != ARPHRD_IPGRE) && 3264 (dev->type != ARPHRD_TUNNEL) && 3265 (dev->type != ARPHRD_NONE)) { 3266 /* Alas, we support only Ethernet autoconfiguration. */ 3267 return; 3268 } 3269 3270 idev = addrconf_add_dev(dev); 3271 if (IS_ERR(idev)) 3272 return; 3273 3274 /* this device type has no EUI support */ 3275 if (dev->type == ARPHRD_NONE && 3276 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3277 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3278 3279 addrconf_addr_gen(idev, false); 3280 } 3281 3282 #if IS_ENABLED(CONFIG_IPV6_SIT) 3283 static void addrconf_sit_config(struct net_device *dev) 3284 { 3285 struct inet6_dev *idev; 3286 3287 ASSERT_RTNL(); 3288 3289 /* 3290 * Configure the tunnel with one of our IPv4 3291 * addresses... we should configure all of 3292 * our v4 addrs in the tunnel 3293 */ 3294 3295 idev = ipv6_find_idev(dev); 3296 if (!idev) { 3297 pr_debug("%s: add_dev failed\n", __func__); 3298 return; 3299 } 3300 3301 if (dev->priv_flags & IFF_ISATAP) { 3302 addrconf_addr_gen(idev, false); 3303 return; 3304 } 3305 3306 sit_add_v4_addrs(idev); 3307 3308 if (dev->flags&IFF_POINTOPOINT) 3309 addrconf_add_mroute(dev); 3310 } 3311 #endif 3312 3313 #if IS_ENABLED(CONFIG_NET_IPGRE) 3314 static void addrconf_gre_config(struct net_device *dev) 3315 { 3316 struct inet6_dev *idev; 3317 3318 ASSERT_RTNL(); 3319 3320 idev = ipv6_find_idev(dev); 3321 if (!idev) { 3322 pr_debug("%s: add_dev failed\n", __func__); 3323 return; 3324 } 3325 3326 addrconf_addr_gen(idev, true); 3327 if (dev->flags & IFF_POINTOPOINT) 3328 addrconf_add_mroute(dev); 3329 } 3330 #endif 3331 3332 static int fixup_permanent_addr(struct inet6_dev *idev, 3333 struct inet6_ifaddr *ifp) 3334 { 3335 /* !rt6i_node means the host route was removed from the 3336 * FIB, for example, if 'lo' device is taken down. In that 3337 * case regenerate the host route. 3338 */ 3339 if (!ifp->rt || !ifp->rt->rt6i_node) { 3340 struct rt6_info *rt, *prev; 3341 3342 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3343 if (IS_ERR(rt)) 3344 return PTR_ERR(rt); 3345 3346 /* ifp->rt can be accessed outside of rtnl */ 3347 spin_lock(&ifp->lock); 3348 prev = ifp->rt; 3349 ifp->rt = rt; 3350 spin_unlock(&ifp->lock); 3351 3352 ip6_rt_put(prev); 3353 } 3354 3355 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3356 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3357 idev->dev, 0, 0); 3358 } 3359 3360 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3361 addrconf_dad_start(ifp); 3362 3363 return 0; 3364 } 3365 3366 static void addrconf_permanent_addr(struct net_device *dev) 3367 { 3368 struct inet6_ifaddr *ifp, *tmp; 3369 struct inet6_dev *idev; 3370 3371 idev = __in6_dev_get(dev); 3372 if (!idev) 3373 return; 3374 3375 write_lock_bh(&idev->lock); 3376 3377 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3378 if ((ifp->flags & IFA_F_PERMANENT) && 3379 fixup_permanent_addr(idev, ifp) < 0) { 3380 write_unlock_bh(&idev->lock); 3381 in6_ifa_hold(ifp); 3382 ipv6_del_addr(ifp); 3383 write_lock_bh(&idev->lock); 3384 3385 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3386 idev->dev->name, &ifp->addr); 3387 } 3388 } 3389 3390 write_unlock_bh(&idev->lock); 3391 } 3392 3393 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3394 void *ptr) 3395 { 3396 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3397 struct netdev_notifier_changeupper_info *info; 3398 struct inet6_dev *idev = __in6_dev_get(dev); 3399 struct net *net = dev_net(dev); 3400 int run_pending = 0; 3401 int err; 3402 3403 switch (event) { 3404 case NETDEV_REGISTER: 3405 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3406 idev = ipv6_add_dev(dev); 3407 if (IS_ERR(idev)) 3408 return notifier_from_errno(PTR_ERR(idev)); 3409 } 3410 break; 3411 3412 case NETDEV_CHANGEMTU: 3413 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3414 if (dev->mtu < IPV6_MIN_MTU) { 3415 addrconf_ifdown(dev, dev != net->loopback_dev); 3416 break; 3417 } 3418 3419 if (idev) { 3420 rt6_mtu_change(dev, dev->mtu); 3421 idev->cnf.mtu6 = dev->mtu; 3422 break; 3423 } 3424 3425 /* allocate new idev */ 3426 idev = ipv6_add_dev(dev); 3427 if (IS_ERR(idev)) 3428 break; 3429 3430 /* device is still not ready */ 3431 if (!(idev->if_flags & IF_READY)) 3432 break; 3433 3434 run_pending = 1; 3435 3436 /* fall through */ 3437 3438 case NETDEV_UP: 3439 case NETDEV_CHANGE: 3440 if (dev->flags & IFF_SLAVE) 3441 break; 3442 3443 if (idev && idev->cnf.disable_ipv6) 3444 break; 3445 3446 if (event == NETDEV_UP) { 3447 /* restore routes for permanent addresses */ 3448 addrconf_permanent_addr(dev); 3449 3450 if (!addrconf_link_ready(dev)) { 3451 /* device is not ready yet. */ 3452 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3453 dev->name); 3454 break; 3455 } 3456 3457 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3458 idev = ipv6_add_dev(dev); 3459 3460 if (!IS_ERR_OR_NULL(idev)) { 3461 idev->if_flags |= IF_READY; 3462 run_pending = 1; 3463 } 3464 } else if (event == NETDEV_CHANGE) { 3465 if (!addrconf_link_ready(dev)) { 3466 /* device is still not ready. */ 3467 rt6_sync_down_dev(dev, event); 3468 break; 3469 } 3470 3471 if (idev) { 3472 if (idev->if_flags & IF_READY) { 3473 /* device is already configured - 3474 * but resend MLD reports, we might 3475 * have roamed and need to update 3476 * multicast snooping switches 3477 */ 3478 ipv6_mc_up(idev); 3479 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3480 break; 3481 } 3482 idev->if_flags |= IF_READY; 3483 } 3484 3485 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3486 dev->name); 3487 3488 run_pending = 1; 3489 } 3490 3491 switch (dev->type) { 3492 #if IS_ENABLED(CONFIG_IPV6_SIT) 3493 case ARPHRD_SIT: 3494 addrconf_sit_config(dev); 3495 break; 3496 #endif 3497 #if IS_ENABLED(CONFIG_NET_IPGRE) 3498 case ARPHRD_IPGRE: 3499 addrconf_gre_config(dev); 3500 break; 3501 #endif 3502 case ARPHRD_LOOPBACK: 3503 init_loopback(dev); 3504 break; 3505 3506 default: 3507 addrconf_dev_config(dev); 3508 break; 3509 } 3510 3511 if (!IS_ERR_OR_NULL(idev)) { 3512 if (run_pending) 3513 addrconf_dad_run(idev); 3514 3515 /* Device has an address by now */ 3516 rt6_sync_up(dev, RTNH_F_DEAD); 3517 3518 /* 3519 * If the MTU changed during the interface down, 3520 * when the interface up, the changed MTU must be 3521 * reflected in the idev as well as routers. 3522 */ 3523 if (idev->cnf.mtu6 != dev->mtu && 3524 dev->mtu >= IPV6_MIN_MTU) { 3525 rt6_mtu_change(dev, dev->mtu); 3526 idev->cnf.mtu6 = dev->mtu; 3527 } 3528 idev->tstamp = jiffies; 3529 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3530 3531 /* 3532 * If the changed mtu during down is lower than 3533 * IPV6_MIN_MTU stop IPv6 on this interface. 3534 */ 3535 if (dev->mtu < IPV6_MIN_MTU) 3536 addrconf_ifdown(dev, dev != net->loopback_dev); 3537 } 3538 break; 3539 3540 case NETDEV_DOWN: 3541 case NETDEV_UNREGISTER: 3542 /* 3543 * Remove all addresses from this interface. 3544 */ 3545 addrconf_ifdown(dev, event != NETDEV_DOWN); 3546 break; 3547 3548 case NETDEV_CHANGENAME: 3549 if (idev) { 3550 snmp6_unregister_dev(idev); 3551 addrconf_sysctl_unregister(idev); 3552 err = addrconf_sysctl_register(idev); 3553 if (err) 3554 return notifier_from_errno(err); 3555 err = snmp6_register_dev(idev); 3556 if (err) { 3557 addrconf_sysctl_unregister(idev); 3558 return notifier_from_errno(err); 3559 } 3560 } 3561 break; 3562 3563 case NETDEV_PRE_TYPE_CHANGE: 3564 case NETDEV_POST_TYPE_CHANGE: 3565 if (idev) 3566 addrconf_type_change(dev, event); 3567 break; 3568 3569 case NETDEV_CHANGEUPPER: 3570 info = ptr; 3571 3572 /* flush all routes if dev is linked to or unlinked from 3573 * an L3 master device (e.g., VRF) 3574 */ 3575 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3576 addrconf_ifdown(dev, 0); 3577 } 3578 3579 return NOTIFY_OK; 3580 } 3581 3582 /* 3583 * addrconf module should be notified of a device going up 3584 */ 3585 static struct notifier_block ipv6_dev_notf = { 3586 .notifier_call = addrconf_notify, 3587 .priority = ADDRCONF_NOTIFY_PRIORITY, 3588 }; 3589 3590 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3591 { 3592 struct inet6_dev *idev; 3593 ASSERT_RTNL(); 3594 3595 idev = __in6_dev_get(dev); 3596 3597 if (event == NETDEV_POST_TYPE_CHANGE) 3598 ipv6_mc_remap(idev); 3599 else if (event == NETDEV_PRE_TYPE_CHANGE) 3600 ipv6_mc_unmap(idev); 3601 } 3602 3603 static bool addr_is_local(const struct in6_addr *addr) 3604 { 3605 return ipv6_addr_type(addr) & 3606 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3607 } 3608 3609 static int addrconf_ifdown(struct net_device *dev, int how) 3610 { 3611 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3612 struct net *net = dev_net(dev); 3613 struct inet6_dev *idev; 3614 struct inet6_ifaddr *ifa, *tmp; 3615 int _keep_addr; 3616 bool keep_addr; 3617 int state, i; 3618 3619 ASSERT_RTNL(); 3620 3621 rt6_disable_ip(dev, event); 3622 3623 idev = __in6_dev_get(dev); 3624 if (!idev) 3625 return -ENODEV; 3626 3627 /* 3628 * Step 1: remove reference to ipv6 device from parent device. 3629 * Do not dev_put! 3630 */ 3631 if (how) { 3632 idev->dead = 1; 3633 3634 /* protected by rtnl_lock */ 3635 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3636 3637 /* Step 1.5: remove snmp6 entry */ 3638 snmp6_unregister_dev(idev); 3639 3640 } 3641 3642 /* aggregate the system setting and interface setting */ 3643 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3644 if (!_keep_addr) 3645 _keep_addr = idev->cnf.keep_addr_on_down; 3646 3647 /* combine the user config with event to determine if permanent 3648 * addresses are to be removed from address hash table 3649 */ 3650 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3651 3652 /* Step 2: clear hash table */ 3653 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3654 struct hlist_head *h = &inet6_addr_lst[i]; 3655 3656 spin_lock_bh(&addrconf_hash_lock); 3657 restart: 3658 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3659 if (ifa->idev == idev) { 3660 addrconf_del_dad_work(ifa); 3661 /* combined flag + permanent flag decide if 3662 * address is retained on a down event 3663 */ 3664 if (!keep_addr || 3665 !(ifa->flags & IFA_F_PERMANENT) || 3666 addr_is_local(&ifa->addr)) { 3667 hlist_del_init_rcu(&ifa->addr_lst); 3668 goto restart; 3669 } 3670 } 3671 } 3672 spin_unlock_bh(&addrconf_hash_lock); 3673 } 3674 3675 write_lock_bh(&idev->lock); 3676 3677 addrconf_del_rs_timer(idev); 3678 3679 /* Step 2: clear flags for stateless addrconf */ 3680 if (!how) 3681 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3682 3683 /* Step 3: clear tempaddr list */ 3684 while (!list_empty(&idev->tempaddr_list)) { 3685 ifa = list_first_entry(&idev->tempaddr_list, 3686 struct inet6_ifaddr, tmp_list); 3687 list_del(&ifa->tmp_list); 3688 write_unlock_bh(&idev->lock); 3689 spin_lock_bh(&ifa->lock); 3690 3691 if (ifa->ifpub) { 3692 in6_ifa_put(ifa->ifpub); 3693 ifa->ifpub = NULL; 3694 } 3695 spin_unlock_bh(&ifa->lock); 3696 in6_ifa_put(ifa); 3697 write_lock_bh(&idev->lock); 3698 } 3699 3700 /* re-combine the user config with event to determine if permanent 3701 * addresses are to be removed from the interface list 3702 */ 3703 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3704 3705 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3706 struct rt6_info *rt = NULL; 3707 bool keep; 3708 3709 addrconf_del_dad_work(ifa); 3710 3711 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3712 !addr_is_local(&ifa->addr); 3713 3714 write_unlock_bh(&idev->lock); 3715 spin_lock_bh(&ifa->lock); 3716 3717 if (keep) { 3718 /* set state to skip the notifier below */ 3719 state = INET6_IFADDR_STATE_DEAD; 3720 ifa->state = INET6_IFADDR_STATE_PREDAD; 3721 if (!(ifa->flags & IFA_F_NODAD)) 3722 ifa->flags |= IFA_F_TENTATIVE; 3723 3724 rt = ifa->rt; 3725 ifa->rt = NULL; 3726 } else { 3727 state = ifa->state; 3728 ifa->state = INET6_IFADDR_STATE_DEAD; 3729 } 3730 3731 spin_unlock_bh(&ifa->lock); 3732 3733 if (rt) 3734 ip6_del_rt(rt); 3735 3736 if (state != INET6_IFADDR_STATE_DEAD) { 3737 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3738 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3739 } else { 3740 if (idev->cnf.forwarding) 3741 addrconf_leave_anycast(ifa); 3742 addrconf_leave_solict(ifa->idev, &ifa->addr); 3743 } 3744 3745 write_lock_bh(&idev->lock); 3746 if (!keep) { 3747 list_del_rcu(&ifa->if_list); 3748 in6_ifa_put(ifa); 3749 } 3750 } 3751 3752 write_unlock_bh(&idev->lock); 3753 3754 /* Step 5: Discard anycast and multicast list */ 3755 if (how) { 3756 ipv6_ac_destroy_dev(idev); 3757 ipv6_mc_destroy_dev(idev); 3758 } else { 3759 ipv6_mc_down(idev); 3760 } 3761 3762 idev->tstamp = jiffies; 3763 3764 /* Last: Shot the device (if unregistered) */ 3765 if (how) { 3766 addrconf_sysctl_unregister(idev); 3767 neigh_parms_release(&nd_tbl, idev->nd_parms); 3768 neigh_ifdown(&nd_tbl, dev); 3769 in6_dev_put(idev); 3770 } 3771 return 0; 3772 } 3773 3774 static void addrconf_rs_timer(struct timer_list *t) 3775 { 3776 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3777 struct net_device *dev = idev->dev; 3778 struct in6_addr lladdr; 3779 3780 write_lock(&idev->lock); 3781 if (idev->dead || !(idev->if_flags & IF_READY)) 3782 goto out; 3783 3784 if (!ipv6_accept_ra(idev)) 3785 goto out; 3786 3787 /* Announcement received after solicitation was sent */ 3788 if (idev->if_flags & IF_RA_RCVD) 3789 goto out; 3790 3791 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3792 write_unlock(&idev->lock); 3793 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3794 ndisc_send_rs(dev, &lladdr, 3795 &in6addr_linklocal_allrouters); 3796 else 3797 goto put; 3798 3799 write_lock(&idev->lock); 3800 idev->rs_interval = rfc3315_s14_backoff_update( 3801 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3802 /* The wait after the last probe can be shorter */ 3803 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3804 idev->cnf.rtr_solicits) ? 3805 idev->cnf.rtr_solicit_delay : 3806 idev->rs_interval); 3807 } else { 3808 /* 3809 * Note: we do not support deprecated "all on-link" 3810 * assumption any longer. 3811 */ 3812 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3813 } 3814 3815 out: 3816 write_unlock(&idev->lock); 3817 put: 3818 in6_dev_put(idev); 3819 } 3820 3821 /* 3822 * Duplicate Address Detection 3823 */ 3824 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3825 { 3826 unsigned long rand_num; 3827 struct inet6_dev *idev = ifp->idev; 3828 u64 nonce; 3829 3830 if (ifp->flags & IFA_F_OPTIMISTIC) 3831 rand_num = 0; 3832 else 3833 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3834 3835 nonce = 0; 3836 if (idev->cnf.enhanced_dad || 3837 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3838 do 3839 get_random_bytes(&nonce, 6); 3840 while (nonce == 0); 3841 } 3842 ifp->dad_nonce = nonce; 3843 ifp->dad_probes = idev->cnf.dad_transmits; 3844 addrconf_mod_dad_work(ifp, rand_num); 3845 } 3846 3847 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3848 { 3849 struct inet6_dev *idev = ifp->idev; 3850 struct net_device *dev = idev->dev; 3851 bool bump_id, notify = false; 3852 3853 addrconf_join_solict(dev, &ifp->addr); 3854 3855 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3856 3857 read_lock_bh(&idev->lock); 3858 spin_lock(&ifp->lock); 3859 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3860 goto out; 3861 3862 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3863 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3864 idev->cnf.accept_dad < 1) || 3865 !(ifp->flags&IFA_F_TENTATIVE) || 3866 ifp->flags & IFA_F_NODAD) { 3867 bool send_na = false; 3868 3869 if (ifp->flags & IFA_F_TENTATIVE && 3870 !(ifp->flags & IFA_F_OPTIMISTIC)) 3871 send_na = true; 3872 bump_id = ifp->flags & IFA_F_TENTATIVE; 3873 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3874 spin_unlock(&ifp->lock); 3875 read_unlock_bh(&idev->lock); 3876 3877 addrconf_dad_completed(ifp, bump_id, send_na); 3878 return; 3879 } 3880 3881 if (!(idev->if_flags & IF_READY)) { 3882 spin_unlock(&ifp->lock); 3883 read_unlock_bh(&idev->lock); 3884 /* 3885 * If the device is not ready: 3886 * - keep it tentative if it is a permanent address. 3887 * - otherwise, kill it. 3888 */ 3889 in6_ifa_hold(ifp); 3890 addrconf_dad_stop(ifp, 0); 3891 return; 3892 } 3893 3894 /* 3895 * Optimistic nodes can start receiving 3896 * Frames right away 3897 */ 3898 if (ifp->flags & IFA_F_OPTIMISTIC) { 3899 ip6_ins_rt(ifp->rt); 3900 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3901 /* Because optimistic nodes can use this address, 3902 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3903 */ 3904 notify = true; 3905 } 3906 } 3907 3908 addrconf_dad_kick(ifp); 3909 out: 3910 spin_unlock(&ifp->lock); 3911 read_unlock_bh(&idev->lock); 3912 if (notify) 3913 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3914 } 3915 3916 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3917 { 3918 bool begin_dad = false; 3919 3920 spin_lock_bh(&ifp->lock); 3921 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3922 ifp->state = INET6_IFADDR_STATE_PREDAD; 3923 begin_dad = true; 3924 } 3925 spin_unlock_bh(&ifp->lock); 3926 3927 if (begin_dad) 3928 addrconf_mod_dad_work(ifp, 0); 3929 } 3930 3931 static void addrconf_dad_work(struct work_struct *w) 3932 { 3933 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3934 struct inet6_ifaddr, 3935 dad_work); 3936 struct inet6_dev *idev = ifp->idev; 3937 bool bump_id, disable_ipv6 = false; 3938 struct in6_addr mcaddr; 3939 3940 enum { 3941 DAD_PROCESS, 3942 DAD_BEGIN, 3943 DAD_ABORT, 3944 } action = DAD_PROCESS; 3945 3946 rtnl_lock(); 3947 3948 spin_lock_bh(&ifp->lock); 3949 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3950 action = DAD_BEGIN; 3951 ifp->state = INET6_IFADDR_STATE_DAD; 3952 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3953 action = DAD_ABORT; 3954 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3955 3956 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3957 idev->cnf.accept_dad > 1) && 3958 !idev->cnf.disable_ipv6 && 3959 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3960 struct in6_addr addr; 3961 3962 addr.s6_addr32[0] = htonl(0xfe800000); 3963 addr.s6_addr32[1] = 0; 3964 3965 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3966 ipv6_addr_equal(&ifp->addr, &addr)) { 3967 /* DAD failed for link-local based on MAC */ 3968 idev->cnf.disable_ipv6 = 1; 3969 3970 pr_info("%s: IPv6 being disabled!\n", 3971 ifp->idev->dev->name); 3972 disable_ipv6 = true; 3973 } 3974 } 3975 } 3976 spin_unlock_bh(&ifp->lock); 3977 3978 if (action == DAD_BEGIN) { 3979 addrconf_dad_begin(ifp); 3980 goto out; 3981 } else if (action == DAD_ABORT) { 3982 in6_ifa_hold(ifp); 3983 addrconf_dad_stop(ifp, 1); 3984 if (disable_ipv6) 3985 addrconf_ifdown(idev->dev, 0); 3986 goto out; 3987 } 3988 3989 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3990 goto out; 3991 3992 write_lock_bh(&idev->lock); 3993 if (idev->dead || !(idev->if_flags & IF_READY)) { 3994 write_unlock_bh(&idev->lock); 3995 goto out; 3996 } 3997 3998 spin_lock(&ifp->lock); 3999 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4000 spin_unlock(&ifp->lock); 4001 write_unlock_bh(&idev->lock); 4002 goto out; 4003 } 4004 4005 if (ifp->dad_probes == 0) { 4006 bool send_na = false; 4007 4008 /* 4009 * DAD was successful 4010 */ 4011 4012 if (ifp->flags & IFA_F_TENTATIVE && 4013 !(ifp->flags & IFA_F_OPTIMISTIC)) 4014 send_na = true; 4015 bump_id = ifp->flags & IFA_F_TENTATIVE; 4016 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4017 spin_unlock(&ifp->lock); 4018 write_unlock_bh(&idev->lock); 4019 4020 addrconf_dad_completed(ifp, bump_id, send_na); 4021 4022 goto out; 4023 } 4024 4025 ifp->dad_probes--; 4026 addrconf_mod_dad_work(ifp, 4027 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4028 spin_unlock(&ifp->lock); 4029 write_unlock_bh(&idev->lock); 4030 4031 /* send a neighbour solicitation for our addr */ 4032 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4033 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4034 ifp->dad_nonce); 4035 out: 4036 in6_ifa_put(ifp); 4037 rtnl_unlock(); 4038 } 4039 4040 /* ifp->idev must be at least read locked */ 4041 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4042 { 4043 struct inet6_ifaddr *ifpiter; 4044 struct inet6_dev *idev = ifp->idev; 4045 4046 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4047 if (ifpiter->scope > IFA_LINK) 4048 break; 4049 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4050 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4051 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4052 IFA_F_PERMANENT) 4053 return false; 4054 } 4055 return true; 4056 } 4057 4058 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4059 bool send_na) 4060 { 4061 struct net_device *dev = ifp->idev->dev; 4062 struct in6_addr lladdr; 4063 bool send_rs, send_mld; 4064 4065 addrconf_del_dad_work(ifp); 4066 4067 /* 4068 * Configure the address for reception. Now it is valid. 4069 */ 4070 4071 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4072 4073 /* If added prefix is link local and we are prepared to process 4074 router advertisements, start sending router solicitations. 4075 */ 4076 4077 read_lock_bh(&ifp->idev->lock); 4078 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4079 send_rs = send_mld && 4080 ipv6_accept_ra(ifp->idev) && 4081 ifp->idev->cnf.rtr_solicits != 0 && 4082 (dev->flags&IFF_LOOPBACK) == 0; 4083 read_unlock_bh(&ifp->idev->lock); 4084 4085 /* While dad is in progress mld report's source address is in6_addrany. 4086 * Resend with proper ll now. 4087 */ 4088 if (send_mld) 4089 ipv6_mc_dad_complete(ifp->idev); 4090 4091 /* send unsolicited NA if enabled */ 4092 if (send_na && 4093 (ifp->idev->cnf.ndisc_notify || 4094 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4095 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4096 /*router=*/ !!ifp->idev->cnf.forwarding, 4097 /*solicited=*/ false, /*override=*/ true, 4098 /*inc_opt=*/ true); 4099 } 4100 4101 if (send_rs) { 4102 /* 4103 * If a host as already performed a random delay 4104 * [...] as part of DAD [...] there is no need 4105 * to delay again before sending the first RS 4106 */ 4107 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4108 return; 4109 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4110 4111 write_lock_bh(&ifp->idev->lock); 4112 spin_lock(&ifp->lock); 4113 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4114 ifp->idev->cnf.rtr_solicit_interval); 4115 ifp->idev->rs_probes = 1; 4116 ifp->idev->if_flags |= IF_RS_SENT; 4117 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4118 spin_unlock(&ifp->lock); 4119 write_unlock_bh(&ifp->idev->lock); 4120 } 4121 4122 if (bump_id) 4123 rt_genid_bump_ipv6(dev_net(dev)); 4124 4125 /* Make sure that a new temporary address will be created 4126 * before this temporary address becomes deprecated. 4127 */ 4128 if (ifp->flags & IFA_F_TEMPORARY) 4129 addrconf_verify_rtnl(); 4130 } 4131 4132 static void addrconf_dad_run(struct inet6_dev *idev) 4133 { 4134 struct inet6_ifaddr *ifp; 4135 4136 read_lock_bh(&idev->lock); 4137 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4138 spin_lock(&ifp->lock); 4139 if (ifp->flags & IFA_F_TENTATIVE && 4140 ifp->state == INET6_IFADDR_STATE_DAD) 4141 addrconf_dad_kick(ifp); 4142 spin_unlock(&ifp->lock); 4143 } 4144 read_unlock_bh(&idev->lock); 4145 } 4146 4147 #ifdef CONFIG_PROC_FS 4148 struct if6_iter_state { 4149 struct seq_net_private p; 4150 int bucket; 4151 int offset; 4152 }; 4153 4154 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4155 { 4156 struct if6_iter_state *state = seq->private; 4157 struct net *net = seq_file_net(seq); 4158 struct inet6_ifaddr *ifa = NULL; 4159 int p = 0; 4160 4161 /* initial bucket if pos is 0 */ 4162 if (pos == 0) { 4163 state->bucket = 0; 4164 state->offset = 0; 4165 } 4166 4167 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4168 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4169 addr_lst) { 4170 if (!net_eq(dev_net(ifa->idev->dev), net)) 4171 continue; 4172 /* sync with offset */ 4173 if (p < state->offset) { 4174 p++; 4175 continue; 4176 } 4177 state->offset++; 4178 return ifa; 4179 } 4180 4181 /* prepare for next bucket */ 4182 state->offset = 0; 4183 p = 0; 4184 } 4185 return NULL; 4186 } 4187 4188 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4189 struct inet6_ifaddr *ifa) 4190 { 4191 struct if6_iter_state *state = seq->private; 4192 struct net *net = seq_file_net(seq); 4193 4194 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4195 if (!net_eq(dev_net(ifa->idev->dev), net)) 4196 continue; 4197 state->offset++; 4198 return ifa; 4199 } 4200 4201 while (++state->bucket < IN6_ADDR_HSIZE) { 4202 state->offset = 0; 4203 hlist_for_each_entry_rcu(ifa, 4204 &inet6_addr_lst[state->bucket], addr_lst) { 4205 if (!net_eq(dev_net(ifa->idev->dev), net)) 4206 continue; 4207 state->offset++; 4208 return ifa; 4209 } 4210 } 4211 4212 return NULL; 4213 } 4214 4215 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4216 __acquires(rcu) 4217 { 4218 rcu_read_lock(); 4219 return if6_get_first(seq, *pos); 4220 } 4221 4222 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4223 { 4224 struct inet6_ifaddr *ifa; 4225 4226 ifa = if6_get_next(seq, v); 4227 ++*pos; 4228 return ifa; 4229 } 4230 4231 static void if6_seq_stop(struct seq_file *seq, void *v) 4232 __releases(rcu) 4233 { 4234 rcu_read_unlock(); 4235 } 4236 4237 static int if6_seq_show(struct seq_file *seq, void *v) 4238 { 4239 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4240 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4241 &ifp->addr, 4242 ifp->idev->dev->ifindex, 4243 ifp->prefix_len, 4244 ifp->scope, 4245 (u8) ifp->flags, 4246 ifp->idev->dev->name); 4247 return 0; 4248 } 4249 4250 static const struct seq_operations if6_seq_ops = { 4251 .start = if6_seq_start, 4252 .next = if6_seq_next, 4253 .show = if6_seq_show, 4254 .stop = if6_seq_stop, 4255 }; 4256 4257 static int __net_init if6_proc_net_init(struct net *net) 4258 { 4259 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4260 sizeof(struct if6_iter_state))) 4261 return -ENOMEM; 4262 return 0; 4263 } 4264 4265 static void __net_exit if6_proc_net_exit(struct net *net) 4266 { 4267 remove_proc_entry("if_inet6", net->proc_net); 4268 } 4269 4270 static struct pernet_operations if6_proc_net_ops = { 4271 .init = if6_proc_net_init, 4272 .exit = if6_proc_net_exit, 4273 }; 4274 4275 int __init if6_proc_init(void) 4276 { 4277 return register_pernet_subsys(&if6_proc_net_ops); 4278 } 4279 4280 void if6_proc_exit(void) 4281 { 4282 unregister_pernet_subsys(&if6_proc_net_ops); 4283 } 4284 #endif /* CONFIG_PROC_FS */ 4285 4286 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4287 /* Check if address is a home address configured on any interface. */ 4288 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4289 { 4290 unsigned int hash = inet6_addr_hash(net, addr); 4291 struct inet6_ifaddr *ifp = NULL; 4292 int ret = 0; 4293 4294 rcu_read_lock(); 4295 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4296 if (!net_eq(dev_net(ifp->idev->dev), net)) 4297 continue; 4298 if (ipv6_addr_equal(&ifp->addr, addr) && 4299 (ifp->flags & IFA_F_HOMEADDRESS)) { 4300 ret = 1; 4301 break; 4302 } 4303 } 4304 rcu_read_unlock(); 4305 return ret; 4306 } 4307 #endif 4308 4309 /* 4310 * Periodic address status verification 4311 */ 4312 4313 static void addrconf_verify_rtnl(void) 4314 { 4315 unsigned long now, next, next_sec, next_sched; 4316 struct inet6_ifaddr *ifp; 4317 int i; 4318 4319 ASSERT_RTNL(); 4320 4321 rcu_read_lock_bh(); 4322 now = jiffies; 4323 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4324 4325 cancel_delayed_work(&addr_chk_work); 4326 4327 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4328 restart: 4329 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4330 unsigned long age; 4331 4332 /* When setting preferred_lft to a value not zero or 4333 * infinity, while valid_lft is infinity 4334 * IFA_F_PERMANENT has a non-infinity life time. 4335 */ 4336 if ((ifp->flags & IFA_F_PERMANENT) && 4337 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4338 continue; 4339 4340 spin_lock(&ifp->lock); 4341 /* We try to batch several events at once. */ 4342 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4343 4344 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4345 age >= ifp->valid_lft) { 4346 spin_unlock(&ifp->lock); 4347 in6_ifa_hold(ifp); 4348 ipv6_del_addr(ifp); 4349 goto restart; 4350 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4351 spin_unlock(&ifp->lock); 4352 continue; 4353 } else if (age >= ifp->prefered_lft) { 4354 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4355 int deprecate = 0; 4356 4357 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4358 deprecate = 1; 4359 ifp->flags |= IFA_F_DEPRECATED; 4360 } 4361 4362 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4363 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4364 next = ifp->tstamp + ifp->valid_lft * HZ; 4365 4366 spin_unlock(&ifp->lock); 4367 4368 if (deprecate) { 4369 in6_ifa_hold(ifp); 4370 4371 ipv6_ifa_notify(0, ifp); 4372 in6_ifa_put(ifp); 4373 goto restart; 4374 } 4375 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4376 !(ifp->flags&IFA_F_TENTATIVE)) { 4377 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4378 ifp->idev->cnf.dad_transmits * 4379 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4380 4381 if (age >= ifp->prefered_lft - regen_advance) { 4382 struct inet6_ifaddr *ifpub = ifp->ifpub; 4383 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4384 next = ifp->tstamp + ifp->prefered_lft * HZ; 4385 if (!ifp->regen_count && ifpub) { 4386 ifp->regen_count++; 4387 in6_ifa_hold(ifp); 4388 in6_ifa_hold(ifpub); 4389 spin_unlock(&ifp->lock); 4390 4391 spin_lock(&ifpub->lock); 4392 ifpub->regen_count = 0; 4393 spin_unlock(&ifpub->lock); 4394 rcu_read_unlock_bh(); 4395 ipv6_create_tempaddr(ifpub, ifp, true); 4396 in6_ifa_put(ifpub); 4397 in6_ifa_put(ifp); 4398 rcu_read_lock_bh(); 4399 goto restart; 4400 } 4401 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4402 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4403 spin_unlock(&ifp->lock); 4404 } else { 4405 /* ifp->prefered_lft <= ifp->valid_lft */ 4406 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4407 next = ifp->tstamp + ifp->prefered_lft * HZ; 4408 spin_unlock(&ifp->lock); 4409 } 4410 } 4411 } 4412 4413 next_sec = round_jiffies_up(next); 4414 next_sched = next; 4415 4416 /* If rounded timeout is accurate enough, accept it. */ 4417 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4418 next_sched = next_sec; 4419 4420 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4421 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4422 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4423 4424 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4425 now, next, next_sec, next_sched); 4426 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4427 rcu_read_unlock_bh(); 4428 } 4429 4430 static void addrconf_verify_work(struct work_struct *w) 4431 { 4432 rtnl_lock(); 4433 addrconf_verify_rtnl(); 4434 rtnl_unlock(); 4435 } 4436 4437 static void addrconf_verify(void) 4438 { 4439 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4440 } 4441 4442 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4443 struct in6_addr **peer_pfx) 4444 { 4445 struct in6_addr *pfx = NULL; 4446 4447 *peer_pfx = NULL; 4448 4449 if (addr) 4450 pfx = nla_data(addr); 4451 4452 if (local) { 4453 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4454 *peer_pfx = pfx; 4455 pfx = nla_data(local); 4456 } 4457 4458 return pfx; 4459 } 4460 4461 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4462 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4463 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4464 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4465 [IFA_FLAGS] = { .len = sizeof(u32) }, 4466 }; 4467 4468 static int 4469 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4470 struct netlink_ext_ack *extack) 4471 { 4472 struct net *net = sock_net(skb->sk); 4473 struct ifaddrmsg *ifm; 4474 struct nlattr *tb[IFA_MAX+1]; 4475 struct in6_addr *pfx, *peer_pfx; 4476 u32 ifa_flags; 4477 int err; 4478 4479 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4480 extack); 4481 if (err < 0) 4482 return err; 4483 4484 ifm = nlmsg_data(nlh); 4485 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4486 if (!pfx) 4487 return -EINVAL; 4488 4489 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4490 4491 /* We ignore other flags so far. */ 4492 ifa_flags &= IFA_F_MANAGETEMPADDR; 4493 4494 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4495 ifm->ifa_prefixlen); 4496 } 4497 4498 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4499 u32 prefered_lft, u32 valid_lft) 4500 { 4501 u32 flags; 4502 clock_t expires; 4503 unsigned long timeout; 4504 bool was_managetempaddr; 4505 bool had_prefixroute; 4506 4507 ASSERT_RTNL(); 4508 4509 if (!valid_lft || (prefered_lft > valid_lft)) 4510 return -EINVAL; 4511 4512 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4513 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4514 return -EINVAL; 4515 4516 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4517 ifa_flags &= ~IFA_F_OPTIMISTIC; 4518 4519 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4520 if (addrconf_finite_timeout(timeout)) { 4521 expires = jiffies_to_clock_t(timeout * HZ); 4522 valid_lft = timeout; 4523 flags = RTF_EXPIRES; 4524 } else { 4525 expires = 0; 4526 flags = 0; 4527 ifa_flags |= IFA_F_PERMANENT; 4528 } 4529 4530 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4531 if (addrconf_finite_timeout(timeout)) { 4532 if (timeout == 0) 4533 ifa_flags |= IFA_F_DEPRECATED; 4534 prefered_lft = timeout; 4535 } 4536 4537 spin_lock_bh(&ifp->lock); 4538 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4539 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4540 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4541 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4542 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4543 IFA_F_NOPREFIXROUTE); 4544 ifp->flags |= ifa_flags; 4545 ifp->tstamp = jiffies; 4546 ifp->valid_lft = valid_lft; 4547 ifp->prefered_lft = prefered_lft; 4548 4549 spin_unlock_bh(&ifp->lock); 4550 if (!(ifp->flags&IFA_F_TENTATIVE)) 4551 ipv6_ifa_notify(0, ifp); 4552 4553 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4554 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4555 expires, flags); 4556 } else if (had_prefixroute) { 4557 enum cleanup_prefix_rt_t action; 4558 unsigned long rt_expires; 4559 4560 write_lock_bh(&ifp->idev->lock); 4561 action = check_cleanup_prefix_route(ifp, &rt_expires); 4562 write_unlock_bh(&ifp->idev->lock); 4563 4564 if (action != CLEANUP_PREFIX_RT_NOP) { 4565 cleanup_prefix_route(ifp, rt_expires, 4566 action == CLEANUP_PREFIX_RT_DEL); 4567 } 4568 } 4569 4570 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4571 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4572 valid_lft = prefered_lft = 0; 4573 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4574 !was_managetempaddr, jiffies); 4575 } 4576 4577 addrconf_verify_rtnl(); 4578 4579 return 0; 4580 } 4581 4582 static int 4583 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4584 struct netlink_ext_ack *extack) 4585 { 4586 struct net *net = sock_net(skb->sk); 4587 struct ifaddrmsg *ifm; 4588 struct nlattr *tb[IFA_MAX+1]; 4589 struct in6_addr *pfx, *peer_pfx; 4590 struct inet6_ifaddr *ifa; 4591 struct net_device *dev; 4592 struct inet6_dev *idev; 4593 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4594 u32 ifa_flags; 4595 int err; 4596 4597 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4598 extack); 4599 if (err < 0) 4600 return err; 4601 4602 ifm = nlmsg_data(nlh); 4603 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4604 if (!pfx) 4605 return -EINVAL; 4606 4607 if (tb[IFA_CACHEINFO]) { 4608 struct ifa_cacheinfo *ci; 4609 4610 ci = nla_data(tb[IFA_CACHEINFO]); 4611 valid_lft = ci->ifa_valid; 4612 preferred_lft = ci->ifa_prefered; 4613 } else { 4614 preferred_lft = INFINITY_LIFE_TIME; 4615 valid_lft = INFINITY_LIFE_TIME; 4616 } 4617 4618 dev = __dev_get_by_index(net, ifm->ifa_index); 4619 if (!dev) 4620 return -ENODEV; 4621 4622 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4623 4624 /* We ignore other flags so far. */ 4625 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4626 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4627 4628 idev = ipv6_find_idev(dev); 4629 if (IS_ERR(idev)) 4630 return PTR_ERR(idev); 4631 4632 if (!ipv6_allow_optimistic_dad(net, idev)) 4633 ifa_flags &= ~IFA_F_OPTIMISTIC; 4634 4635 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) { 4636 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4637 return -EINVAL; 4638 } 4639 4640 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4641 if (!ifa) { 4642 /* 4643 * It would be best to check for !NLM_F_CREATE here but 4644 * userspace already relies on not having to provide this. 4645 */ 4646 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4647 ifm->ifa_prefixlen, ifa_flags, 4648 preferred_lft, valid_lft, extack); 4649 } 4650 4651 if (nlh->nlmsg_flags & NLM_F_EXCL || 4652 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4653 err = -EEXIST; 4654 else 4655 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4656 4657 in6_ifa_put(ifa); 4658 4659 return err; 4660 } 4661 4662 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4663 u8 scope, int ifindex) 4664 { 4665 struct ifaddrmsg *ifm; 4666 4667 ifm = nlmsg_data(nlh); 4668 ifm->ifa_family = AF_INET6; 4669 ifm->ifa_prefixlen = prefixlen; 4670 ifm->ifa_flags = flags; 4671 ifm->ifa_scope = scope; 4672 ifm->ifa_index = ifindex; 4673 } 4674 4675 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4676 unsigned long tstamp, u32 preferred, u32 valid) 4677 { 4678 struct ifa_cacheinfo ci; 4679 4680 ci.cstamp = cstamp_delta(cstamp); 4681 ci.tstamp = cstamp_delta(tstamp); 4682 ci.ifa_prefered = preferred; 4683 ci.ifa_valid = valid; 4684 4685 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4686 } 4687 4688 static inline int rt_scope(int ifa_scope) 4689 { 4690 if (ifa_scope & IFA_HOST) 4691 return RT_SCOPE_HOST; 4692 else if (ifa_scope & IFA_LINK) 4693 return RT_SCOPE_LINK; 4694 else if (ifa_scope & IFA_SITE) 4695 return RT_SCOPE_SITE; 4696 else 4697 return RT_SCOPE_UNIVERSE; 4698 } 4699 4700 static inline int inet6_ifaddr_msgsize(void) 4701 { 4702 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4703 + nla_total_size(16) /* IFA_LOCAL */ 4704 + nla_total_size(16) /* IFA_ADDRESS */ 4705 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4706 + nla_total_size(4) /* IFA_FLAGS */; 4707 } 4708 4709 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4710 u32 portid, u32 seq, int event, unsigned int flags) 4711 { 4712 struct nlmsghdr *nlh; 4713 u32 preferred, valid; 4714 4715 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4716 if (!nlh) 4717 return -EMSGSIZE; 4718 4719 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4720 ifa->idev->dev->ifindex); 4721 4722 if (!((ifa->flags&IFA_F_PERMANENT) && 4723 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4724 preferred = ifa->prefered_lft; 4725 valid = ifa->valid_lft; 4726 if (preferred != INFINITY_LIFE_TIME) { 4727 long tval = (jiffies - ifa->tstamp)/HZ; 4728 if (preferred > tval) 4729 preferred -= tval; 4730 else 4731 preferred = 0; 4732 if (valid != INFINITY_LIFE_TIME) { 4733 if (valid > tval) 4734 valid -= tval; 4735 else 4736 valid = 0; 4737 } 4738 } 4739 } else { 4740 preferred = INFINITY_LIFE_TIME; 4741 valid = INFINITY_LIFE_TIME; 4742 } 4743 4744 if (!ipv6_addr_any(&ifa->peer_addr)) { 4745 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4746 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4747 goto error; 4748 } else 4749 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4750 goto error; 4751 4752 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4753 goto error; 4754 4755 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4756 goto error; 4757 4758 nlmsg_end(skb, nlh); 4759 return 0; 4760 4761 error: 4762 nlmsg_cancel(skb, nlh); 4763 return -EMSGSIZE; 4764 } 4765 4766 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4767 u32 portid, u32 seq, int event, u16 flags) 4768 { 4769 struct nlmsghdr *nlh; 4770 u8 scope = RT_SCOPE_UNIVERSE; 4771 int ifindex = ifmca->idev->dev->ifindex; 4772 4773 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4774 scope = RT_SCOPE_SITE; 4775 4776 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4777 if (!nlh) 4778 return -EMSGSIZE; 4779 4780 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4781 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4782 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4783 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4784 nlmsg_cancel(skb, nlh); 4785 return -EMSGSIZE; 4786 } 4787 4788 nlmsg_end(skb, nlh); 4789 return 0; 4790 } 4791 4792 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4793 u32 portid, u32 seq, int event, unsigned int flags) 4794 { 4795 struct nlmsghdr *nlh; 4796 u8 scope = RT_SCOPE_UNIVERSE; 4797 int ifindex = ifaca->aca_idev->dev->ifindex; 4798 4799 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4800 scope = RT_SCOPE_SITE; 4801 4802 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4803 if (!nlh) 4804 return -EMSGSIZE; 4805 4806 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4807 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4808 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4809 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4810 nlmsg_cancel(skb, nlh); 4811 return -EMSGSIZE; 4812 } 4813 4814 nlmsg_end(skb, nlh); 4815 return 0; 4816 } 4817 4818 enum addr_type_t { 4819 UNICAST_ADDR, 4820 MULTICAST_ADDR, 4821 ANYCAST_ADDR, 4822 }; 4823 4824 /* called with rcu_read_lock() */ 4825 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4826 struct netlink_callback *cb, enum addr_type_t type, 4827 int s_ip_idx, int *p_ip_idx) 4828 { 4829 struct ifmcaddr6 *ifmca; 4830 struct ifacaddr6 *ifaca; 4831 int err = 1; 4832 int ip_idx = *p_ip_idx; 4833 4834 read_lock_bh(&idev->lock); 4835 switch (type) { 4836 case UNICAST_ADDR: { 4837 struct inet6_ifaddr *ifa; 4838 4839 /* unicast address incl. temp addr */ 4840 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4841 if (++ip_idx < s_ip_idx) 4842 continue; 4843 err = inet6_fill_ifaddr(skb, ifa, 4844 NETLINK_CB(cb->skb).portid, 4845 cb->nlh->nlmsg_seq, 4846 RTM_NEWADDR, 4847 NLM_F_MULTI); 4848 if (err < 0) 4849 break; 4850 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4851 } 4852 break; 4853 } 4854 case MULTICAST_ADDR: 4855 /* multicast address */ 4856 for (ifmca = idev->mc_list; ifmca; 4857 ifmca = ifmca->next, ip_idx++) { 4858 if (ip_idx < s_ip_idx) 4859 continue; 4860 err = inet6_fill_ifmcaddr(skb, ifmca, 4861 NETLINK_CB(cb->skb).portid, 4862 cb->nlh->nlmsg_seq, 4863 RTM_GETMULTICAST, 4864 NLM_F_MULTI); 4865 if (err < 0) 4866 break; 4867 } 4868 break; 4869 case ANYCAST_ADDR: 4870 /* anycast address */ 4871 for (ifaca = idev->ac_list; ifaca; 4872 ifaca = ifaca->aca_next, ip_idx++) { 4873 if (ip_idx < s_ip_idx) 4874 continue; 4875 err = inet6_fill_ifacaddr(skb, ifaca, 4876 NETLINK_CB(cb->skb).portid, 4877 cb->nlh->nlmsg_seq, 4878 RTM_GETANYCAST, 4879 NLM_F_MULTI); 4880 if (err < 0) 4881 break; 4882 } 4883 break; 4884 default: 4885 break; 4886 } 4887 read_unlock_bh(&idev->lock); 4888 *p_ip_idx = ip_idx; 4889 return err; 4890 } 4891 4892 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4893 enum addr_type_t type) 4894 { 4895 struct net *net = sock_net(skb->sk); 4896 int h, s_h; 4897 int idx, ip_idx; 4898 int s_idx, s_ip_idx; 4899 struct net_device *dev; 4900 struct inet6_dev *idev; 4901 struct hlist_head *head; 4902 4903 s_h = cb->args[0]; 4904 s_idx = idx = cb->args[1]; 4905 s_ip_idx = ip_idx = cb->args[2]; 4906 4907 rcu_read_lock(); 4908 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4909 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4910 idx = 0; 4911 head = &net->dev_index_head[h]; 4912 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4913 if (idx < s_idx) 4914 goto cont; 4915 if (h > s_h || idx > s_idx) 4916 s_ip_idx = 0; 4917 ip_idx = 0; 4918 idev = __in6_dev_get(dev); 4919 if (!idev) 4920 goto cont; 4921 4922 if (in6_dump_addrs(idev, skb, cb, type, 4923 s_ip_idx, &ip_idx) < 0) 4924 goto done; 4925 cont: 4926 idx++; 4927 } 4928 } 4929 done: 4930 rcu_read_unlock(); 4931 cb->args[0] = h; 4932 cb->args[1] = idx; 4933 cb->args[2] = ip_idx; 4934 4935 return skb->len; 4936 } 4937 4938 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4939 { 4940 enum addr_type_t type = UNICAST_ADDR; 4941 4942 return inet6_dump_addr(skb, cb, type); 4943 } 4944 4945 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4946 { 4947 enum addr_type_t type = MULTICAST_ADDR; 4948 4949 return inet6_dump_addr(skb, cb, type); 4950 } 4951 4952 4953 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4954 { 4955 enum addr_type_t type = ANYCAST_ADDR; 4956 4957 return inet6_dump_addr(skb, cb, type); 4958 } 4959 4960 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4961 struct netlink_ext_ack *extack) 4962 { 4963 struct net *net = sock_net(in_skb->sk); 4964 struct ifaddrmsg *ifm; 4965 struct nlattr *tb[IFA_MAX+1]; 4966 struct in6_addr *addr = NULL, *peer; 4967 struct net_device *dev = NULL; 4968 struct inet6_ifaddr *ifa; 4969 struct sk_buff *skb; 4970 int err; 4971 4972 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4973 extack); 4974 if (err < 0) 4975 return err; 4976 4977 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4978 if (!addr) 4979 return -EINVAL; 4980 4981 ifm = nlmsg_data(nlh); 4982 if (ifm->ifa_index) 4983 dev = dev_get_by_index(net, ifm->ifa_index); 4984 4985 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4986 if (!ifa) { 4987 err = -EADDRNOTAVAIL; 4988 goto errout; 4989 } 4990 4991 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4992 if (!skb) { 4993 err = -ENOBUFS; 4994 goto errout_ifa; 4995 } 4996 4997 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4998 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4999 if (err < 0) { 5000 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5001 WARN_ON(err == -EMSGSIZE); 5002 kfree_skb(skb); 5003 goto errout_ifa; 5004 } 5005 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5006 errout_ifa: 5007 in6_ifa_put(ifa); 5008 errout: 5009 if (dev) 5010 dev_put(dev); 5011 return err; 5012 } 5013 5014 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5015 { 5016 struct sk_buff *skb; 5017 struct net *net = dev_net(ifa->idev->dev); 5018 int err = -ENOBUFS; 5019 5020 /* Don't send DELADDR notification for TENTATIVE address, 5021 * since NEWADDR notification is sent only after removing 5022 * TENTATIVE flag, if DAD has not failed. 5023 */ 5024 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 5025 event == RTM_DELADDR) 5026 return; 5027 5028 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5029 if (!skb) 5030 goto errout; 5031 5032 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5033 if (err < 0) { 5034 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5035 WARN_ON(err == -EMSGSIZE); 5036 kfree_skb(skb); 5037 goto errout; 5038 } 5039 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5040 return; 5041 errout: 5042 if (err < 0) 5043 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5044 } 5045 5046 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5047 __s32 *array, int bytes) 5048 { 5049 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5050 5051 memset(array, 0, bytes); 5052 array[DEVCONF_FORWARDING] = cnf->forwarding; 5053 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5054 array[DEVCONF_MTU6] = cnf->mtu6; 5055 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5056 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5057 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5058 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5059 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5060 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5061 jiffies_to_msecs(cnf->rtr_solicit_interval); 5062 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5063 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5064 array[DEVCONF_RTR_SOLICIT_DELAY] = 5065 jiffies_to_msecs(cnf->rtr_solicit_delay); 5066 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5067 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5068 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5069 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5070 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5071 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5072 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5073 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5074 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5075 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5076 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5077 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5078 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5079 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5080 #ifdef CONFIG_IPV6_ROUTER_PREF 5081 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5082 array[DEVCONF_RTR_PROBE_INTERVAL] = 5083 jiffies_to_msecs(cnf->rtr_probe_interval); 5084 #ifdef CONFIG_IPV6_ROUTE_INFO 5085 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5086 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5087 #endif 5088 #endif 5089 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5090 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5091 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5092 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5093 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5094 #endif 5095 #ifdef CONFIG_IPV6_MROUTE 5096 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5097 #endif 5098 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5099 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5100 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5101 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5102 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5103 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5104 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5105 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5106 /* we omit DEVCONF_STABLE_SECRET for now */ 5107 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5108 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5109 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5110 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5111 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5112 #ifdef CONFIG_IPV6_SEG6_HMAC 5113 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5114 #endif 5115 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5116 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5117 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5118 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5119 } 5120 5121 static inline size_t inet6_ifla6_size(void) 5122 { 5123 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5124 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5125 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5126 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5127 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5128 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5129 } 5130 5131 static inline size_t inet6_if_nlmsg_size(void) 5132 { 5133 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5134 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5135 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5136 + nla_total_size(4) /* IFLA_MTU */ 5137 + nla_total_size(4) /* IFLA_LINK */ 5138 + nla_total_size(1) /* IFLA_OPERSTATE */ 5139 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5140 } 5141 5142 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5143 int bytes) 5144 { 5145 int i; 5146 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5147 BUG_ON(pad < 0); 5148 5149 /* Use put_unaligned() because stats may not be aligned for u64. */ 5150 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5151 for (i = 1; i < ICMP6_MIB_MAX; i++) 5152 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5153 5154 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5155 } 5156 5157 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5158 int bytes, size_t syncpoff) 5159 { 5160 int i, c; 5161 u64 buff[IPSTATS_MIB_MAX]; 5162 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5163 5164 BUG_ON(pad < 0); 5165 5166 memset(buff, 0, sizeof(buff)); 5167 buff[0] = IPSTATS_MIB_MAX; 5168 5169 for_each_possible_cpu(c) { 5170 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5171 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5172 } 5173 5174 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5175 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5176 } 5177 5178 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5179 int bytes) 5180 { 5181 switch (attrtype) { 5182 case IFLA_INET6_STATS: 5183 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5184 offsetof(struct ipstats_mib, syncp)); 5185 break; 5186 case IFLA_INET6_ICMP6STATS: 5187 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5188 break; 5189 } 5190 } 5191 5192 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5193 u32 ext_filter_mask) 5194 { 5195 struct nlattr *nla; 5196 struct ifla_cacheinfo ci; 5197 5198 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5199 goto nla_put_failure; 5200 ci.max_reasm_len = IPV6_MAXPLEN; 5201 ci.tstamp = cstamp_delta(idev->tstamp); 5202 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5203 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5204 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5205 goto nla_put_failure; 5206 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5207 if (!nla) 5208 goto nla_put_failure; 5209 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5210 5211 /* XXX - MC not implemented */ 5212 5213 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5214 return 0; 5215 5216 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5217 if (!nla) 5218 goto nla_put_failure; 5219 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5220 5221 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5222 if (!nla) 5223 goto nla_put_failure; 5224 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5225 5226 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5227 if (!nla) 5228 goto nla_put_failure; 5229 5230 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5231 goto nla_put_failure; 5232 5233 read_lock_bh(&idev->lock); 5234 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5235 read_unlock_bh(&idev->lock); 5236 5237 return 0; 5238 5239 nla_put_failure: 5240 return -EMSGSIZE; 5241 } 5242 5243 static size_t inet6_get_link_af_size(const struct net_device *dev, 5244 u32 ext_filter_mask) 5245 { 5246 if (!__in6_dev_get(dev)) 5247 return 0; 5248 5249 return inet6_ifla6_size(); 5250 } 5251 5252 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5253 u32 ext_filter_mask) 5254 { 5255 struct inet6_dev *idev = __in6_dev_get(dev); 5256 5257 if (!idev) 5258 return -ENODATA; 5259 5260 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5261 return -EMSGSIZE; 5262 5263 return 0; 5264 } 5265 5266 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5267 { 5268 struct inet6_ifaddr *ifp; 5269 struct net_device *dev = idev->dev; 5270 bool clear_token, update_rs = false; 5271 struct in6_addr ll_addr; 5272 5273 ASSERT_RTNL(); 5274 5275 if (!token) 5276 return -EINVAL; 5277 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5278 return -EINVAL; 5279 if (!ipv6_accept_ra(idev)) 5280 return -EINVAL; 5281 if (idev->cnf.rtr_solicits == 0) 5282 return -EINVAL; 5283 5284 write_lock_bh(&idev->lock); 5285 5286 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5287 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5288 5289 write_unlock_bh(&idev->lock); 5290 5291 clear_token = ipv6_addr_any(token); 5292 if (clear_token) 5293 goto update_lft; 5294 5295 if (!idev->dead && (idev->if_flags & IF_READY) && 5296 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5297 IFA_F_OPTIMISTIC)) { 5298 /* If we're not ready, then normal ifup will take care 5299 * of this. Otherwise, we need to request our rs here. 5300 */ 5301 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5302 update_rs = true; 5303 } 5304 5305 update_lft: 5306 write_lock_bh(&idev->lock); 5307 5308 if (update_rs) { 5309 idev->if_flags |= IF_RS_SENT; 5310 idev->rs_interval = rfc3315_s14_backoff_init( 5311 idev->cnf.rtr_solicit_interval); 5312 idev->rs_probes = 1; 5313 addrconf_mod_rs_timer(idev, idev->rs_interval); 5314 } 5315 5316 /* Well, that's kinda nasty ... */ 5317 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5318 spin_lock(&ifp->lock); 5319 if (ifp->tokenized) { 5320 ifp->valid_lft = 0; 5321 ifp->prefered_lft = 0; 5322 } 5323 spin_unlock(&ifp->lock); 5324 } 5325 5326 write_unlock_bh(&idev->lock); 5327 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5328 addrconf_verify_rtnl(); 5329 return 0; 5330 } 5331 5332 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5333 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5334 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5335 }; 5336 5337 static int inet6_validate_link_af(const struct net_device *dev, 5338 const struct nlattr *nla) 5339 { 5340 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5341 5342 if (dev && !__in6_dev_get(dev)) 5343 return -EAFNOSUPPORT; 5344 5345 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5346 NULL); 5347 } 5348 5349 static int check_addr_gen_mode(int mode) 5350 { 5351 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5352 mode != IN6_ADDR_GEN_MODE_NONE && 5353 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5354 mode != IN6_ADDR_GEN_MODE_RANDOM) 5355 return -EINVAL; 5356 return 1; 5357 } 5358 5359 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5360 int mode) 5361 { 5362 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5363 !idev->cnf.stable_secret.initialized && 5364 !net->ipv6.devconf_dflt->stable_secret.initialized) 5365 return -EINVAL; 5366 return 1; 5367 } 5368 5369 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5370 { 5371 int err = -EINVAL; 5372 struct inet6_dev *idev = __in6_dev_get(dev); 5373 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5374 5375 if (!idev) 5376 return -EAFNOSUPPORT; 5377 5378 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5379 BUG(); 5380 5381 if (tb[IFLA_INET6_TOKEN]) { 5382 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5383 if (err) 5384 return err; 5385 } 5386 5387 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5388 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5389 5390 if (check_addr_gen_mode(mode) < 0 || 5391 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5392 return -EINVAL; 5393 5394 idev->cnf.addr_gen_mode = mode; 5395 err = 0; 5396 } 5397 5398 return err; 5399 } 5400 5401 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5402 u32 portid, u32 seq, int event, unsigned int flags) 5403 { 5404 struct net_device *dev = idev->dev; 5405 struct ifinfomsg *hdr; 5406 struct nlmsghdr *nlh; 5407 void *protoinfo; 5408 5409 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5410 if (!nlh) 5411 return -EMSGSIZE; 5412 5413 hdr = nlmsg_data(nlh); 5414 hdr->ifi_family = AF_INET6; 5415 hdr->__ifi_pad = 0; 5416 hdr->ifi_type = dev->type; 5417 hdr->ifi_index = dev->ifindex; 5418 hdr->ifi_flags = dev_get_flags(dev); 5419 hdr->ifi_change = 0; 5420 5421 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5422 (dev->addr_len && 5423 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5424 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5425 (dev->ifindex != dev_get_iflink(dev) && 5426 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5427 nla_put_u8(skb, IFLA_OPERSTATE, 5428 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5429 goto nla_put_failure; 5430 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5431 if (!protoinfo) 5432 goto nla_put_failure; 5433 5434 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5435 goto nla_put_failure; 5436 5437 nla_nest_end(skb, protoinfo); 5438 nlmsg_end(skb, nlh); 5439 return 0; 5440 5441 nla_put_failure: 5442 nlmsg_cancel(skb, nlh); 5443 return -EMSGSIZE; 5444 } 5445 5446 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5447 { 5448 struct net *net = sock_net(skb->sk); 5449 int h, s_h; 5450 int idx = 0, s_idx; 5451 struct net_device *dev; 5452 struct inet6_dev *idev; 5453 struct hlist_head *head; 5454 5455 s_h = cb->args[0]; 5456 s_idx = cb->args[1]; 5457 5458 rcu_read_lock(); 5459 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5460 idx = 0; 5461 head = &net->dev_index_head[h]; 5462 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5463 if (idx < s_idx) 5464 goto cont; 5465 idev = __in6_dev_get(dev); 5466 if (!idev) 5467 goto cont; 5468 if (inet6_fill_ifinfo(skb, idev, 5469 NETLINK_CB(cb->skb).portid, 5470 cb->nlh->nlmsg_seq, 5471 RTM_NEWLINK, NLM_F_MULTI) < 0) 5472 goto out; 5473 cont: 5474 idx++; 5475 } 5476 } 5477 out: 5478 rcu_read_unlock(); 5479 cb->args[1] = idx; 5480 cb->args[0] = h; 5481 5482 return skb->len; 5483 } 5484 5485 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5486 { 5487 struct sk_buff *skb; 5488 struct net *net = dev_net(idev->dev); 5489 int err = -ENOBUFS; 5490 5491 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5492 if (!skb) 5493 goto errout; 5494 5495 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5496 if (err < 0) { 5497 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5498 WARN_ON(err == -EMSGSIZE); 5499 kfree_skb(skb); 5500 goto errout; 5501 } 5502 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5503 return; 5504 errout: 5505 if (err < 0) 5506 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5507 } 5508 5509 static inline size_t inet6_prefix_nlmsg_size(void) 5510 { 5511 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5512 + nla_total_size(sizeof(struct in6_addr)) 5513 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5514 } 5515 5516 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5517 struct prefix_info *pinfo, u32 portid, u32 seq, 5518 int event, unsigned int flags) 5519 { 5520 struct prefixmsg *pmsg; 5521 struct nlmsghdr *nlh; 5522 struct prefix_cacheinfo ci; 5523 5524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5525 if (!nlh) 5526 return -EMSGSIZE; 5527 5528 pmsg = nlmsg_data(nlh); 5529 pmsg->prefix_family = AF_INET6; 5530 pmsg->prefix_pad1 = 0; 5531 pmsg->prefix_pad2 = 0; 5532 pmsg->prefix_ifindex = idev->dev->ifindex; 5533 pmsg->prefix_len = pinfo->prefix_len; 5534 pmsg->prefix_type = pinfo->type; 5535 pmsg->prefix_pad3 = 0; 5536 pmsg->prefix_flags = 0; 5537 if (pinfo->onlink) 5538 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5539 if (pinfo->autoconf) 5540 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5541 5542 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5543 goto nla_put_failure; 5544 ci.preferred_time = ntohl(pinfo->prefered); 5545 ci.valid_time = ntohl(pinfo->valid); 5546 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5547 goto nla_put_failure; 5548 nlmsg_end(skb, nlh); 5549 return 0; 5550 5551 nla_put_failure: 5552 nlmsg_cancel(skb, nlh); 5553 return -EMSGSIZE; 5554 } 5555 5556 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5557 struct prefix_info *pinfo) 5558 { 5559 struct sk_buff *skb; 5560 struct net *net = dev_net(idev->dev); 5561 int err = -ENOBUFS; 5562 5563 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5564 if (!skb) 5565 goto errout; 5566 5567 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5568 if (err < 0) { 5569 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5570 WARN_ON(err == -EMSGSIZE); 5571 kfree_skb(skb); 5572 goto errout; 5573 } 5574 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5575 return; 5576 errout: 5577 if (err < 0) 5578 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5579 } 5580 5581 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5582 { 5583 struct net *net = dev_net(ifp->idev->dev); 5584 5585 if (event) 5586 ASSERT_RTNL(); 5587 5588 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5589 5590 switch (event) { 5591 case RTM_NEWADDR: 5592 /* 5593 * If the address was optimistic 5594 * we inserted the route at the start of 5595 * our DAD process, so we don't need 5596 * to do it again 5597 */ 5598 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5599 ip6_ins_rt(ifp->rt); 5600 if (ifp->idev->cnf.forwarding) 5601 addrconf_join_anycast(ifp); 5602 if (!ipv6_addr_any(&ifp->peer_addr)) 5603 addrconf_prefix_route(&ifp->peer_addr, 128, 5604 ifp->idev->dev, 0, 0); 5605 break; 5606 case RTM_DELADDR: 5607 if (ifp->idev->cnf.forwarding) 5608 addrconf_leave_anycast(ifp); 5609 addrconf_leave_solict(ifp->idev, &ifp->addr); 5610 if (!ipv6_addr_any(&ifp->peer_addr)) { 5611 struct rt6_info *rt; 5612 5613 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5614 ifp->idev->dev, 0, 0); 5615 if (rt) 5616 ip6_del_rt(rt); 5617 } 5618 if (ifp->rt) { 5619 if (dst_hold_safe(&ifp->rt->dst)) 5620 ip6_del_rt(ifp->rt); 5621 } 5622 rt_genid_bump_ipv6(net); 5623 break; 5624 } 5625 atomic_inc(&net->ipv6.dev_addr_genid); 5626 } 5627 5628 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5629 { 5630 rcu_read_lock_bh(); 5631 if (likely(ifp->idev->dead == 0)) 5632 __ipv6_ifa_notify(event, ifp); 5633 rcu_read_unlock_bh(); 5634 } 5635 5636 #ifdef CONFIG_SYSCTL 5637 5638 static 5639 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5640 void __user *buffer, size_t *lenp, loff_t *ppos) 5641 { 5642 int *valp = ctl->data; 5643 int val = *valp; 5644 loff_t pos = *ppos; 5645 struct ctl_table lctl; 5646 int ret; 5647 5648 /* 5649 * ctl->data points to idev->cnf.forwarding, we should 5650 * not modify it until we get the rtnl lock. 5651 */ 5652 lctl = *ctl; 5653 lctl.data = &val; 5654 5655 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5656 5657 if (write) 5658 ret = addrconf_fixup_forwarding(ctl, valp, val); 5659 if (ret) 5660 *ppos = pos; 5661 return ret; 5662 } 5663 5664 static 5665 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5666 void __user *buffer, size_t *lenp, loff_t *ppos) 5667 { 5668 struct inet6_dev *idev = ctl->extra1; 5669 int min_mtu = IPV6_MIN_MTU; 5670 struct ctl_table lctl; 5671 5672 lctl = *ctl; 5673 lctl.extra1 = &min_mtu; 5674 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5675 5676 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5677 } 5678 5679 static void dev_disable_change(struct inet6_dev *idev) 5680 { 5681 struct netdev_notifier_info info; 5682 5683 if (!idev || !idev->dev) 5684 return; 5685 5686 netdev_notifier_info_init(&info, idev->dev); 5687 if (idev->cnf.disable_ipv6) 5688 addrconf_notify(NULL, NETDEV_DOWN, &info); 5689 else 5690 addrconf_notify(NULL, NETDEV_UP, &info); 5691 } 5692 5693 static void addrconf_disable_change(struct net *net, __s32 newf) 5694 { 5695 struct net_device *dev; 5696 struct inet6_dev *idev; 5697 5698 for_each_netdev(net, dev) { 5699 idev = __in6_dev_get(dev); 5700 if (idev) { 5701 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5702 idev->cnf.disable_ipv6 = newf; 5703 if (changed) 5704 dev_disable_change(idev); 5705 } 5706 } 5707 } 5708 5709 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5710 { 5711 struct net *net; 5712 int old; 5713 5714 if (!rtnl_trylock()) 5715 return restart_syscall(); 5716 5717 net = (struct net *)table->extra2; 5718 old = *p; 5719 *p = newf; 5720 5721 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5722 rtnl_unlock(); 5723 return 0; 5724 } 5725 5726 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5727 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5728 addrconf_disable_change(net, newf); 5729 } else if ((!newf) ^ (!old)) 5730 dev_disable_change((struct inet6_dev *)table->extra1); 5731 5732 rtnl_unlock(); 5733 return 0; 5734 } 5735 5736 static 5737 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5738 void __user *buffer, size_t *lenp, loff_t *ppos) 5739 { 5740 int *valp = ctl->data; 5741 int val = *valp; 5742 loff_t pos = *ppos; 5743 struct ctl_table lctl; 5744 int ret; 5745 5746 /* 5747 * ctl->data points to idev->cnf.disable_ipv6, we should 5748 * not modify it until we get the rtnl lock. 5749 */ 5750 lctl = *ctl; 5751 lctl.data = &val; 5752 5753 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5754 5755 if (write) 5756 ret = addrconf_disable_ipv6(ctl, valp, val); 5757 if (ret) 5758 *ppos = pos; 5759 return ret; 5760 } 5761 5762 static 5763 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5764 void __user *buffer, size_t *lenp, loff_t *ppos) 5765 { 5766 int *valp = ctl->data; 5767 int ret; 5768 int old, new; 5769 5770 old = *valp; 5771 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5772 new = *valp; 5773 5774 if (write && old != new) { 5775 struct net *net = ctl->extra2; 5776 5777 if (!rtnl_trylock()) 5778 return restart_syscall(); 5779 5780 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5781 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5782 NETCONFA_PROXY_NEIGH, 5783 NETCONFA_IFINDEX_DEFAULT, 5784 net->ipv6.devconf_dflt); 5785 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5786 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5787 NETCONFA_PROXY_NEIGH, 5788 NETCONFA_IFINDEX_ALL, 5789 net->ipv6.devconf_all); 5790 else { 5791 struct inet6_dev *idev = ctl->extra1; 5792 5793 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5794 NETCONFA_PROXY_NEIGH, 5795 idev->dev->ifindex, 5796 &idev->cnf); 5797 } 5798 rtnl_unlock(); 5799 } 5800 5801 return ret; 5802 } 5803 5804 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5805 void __user *buffer, size_t *lenp, 5806 loff_t *ppos) 5807 { 5808 int ret = 0; 5809 int new_val; 5810 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5811 struct net *net = (struct net *)ctl->extra2; 5812 5813 if (!rtnl_trylock()) 5814 return restart_syscall(); 5815 5816 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5817 5818 if (write) { 5819 new_val = *((int *)ctl->data); 5820 5821 if (check_addr_gen_mode(new_val) < 0) { 5822 ret = -EINVAL; 5823 goto out; 5824 } 5825 5826 /* request for default */ 5827 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5828 ipv6_devconf_dflt.addr_gen_mode = new_val; 5829 5830 /* request for individual net device */ 5831 } else { 5832 if (!idev) 5833 goto out; 5834 5835 if (check_stable_privacy(idev, net, new_val) < 0) { 5836 ret = -EINVAL; 5837 goto out; 5838 } 5839 5840 if (idev->cnf.addr_gen_mode != new_val) { 5841 idev->cnf.addr_gen_mode = new_val; 5842 addrconf_dev_config(idev->dev); 5843 } 5844 } 5845 } 5846 5847 out: 5848 rtnl_unlock(); 5849 5850 return ret; 5851 } 5852 5853 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5854 void __user *buffer, size_t *lenp, 5855 loff_t *ppos) 5856 { 5857 int err; 5858 struct in6_addr addr; 5859 char str[IPV6_MAX_STRLEN]; 5860 struct ctl_table lctl = *ctl; 5861 struct net *net = ctl->extra2; 5862 struct ipv6_stable_secret *secret = ctl->data; 5863 5864 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5865 return -EIO; 5866 5867 lctl.maxlen = IPV6_MAX_STRLEN; 5868 lctl.data = str; 5869 5870 if (!rtnl_trylock()) 5871 return restart_syscall(); 5872 5873 if (!write && !secret->initialized) { 5874 err = -EIO; 5875 goto out; 5876 } 5877 5878 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5879 if (err >= sizeof(str)) { 5880 err = -EIO; 5881 goto out; 5882 } 5883 5884 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5885 if (err || !write) 5886 goto out; 5887 5888 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5889 err = -EIO; 5890 goto out; 5891 } 5892 5893 secret->initialized = true; 5894 secret->secret = addr; 5895 5896 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5897 struct net_device *dev; 5898 5899 for_each_netdev(net, dev) { 5900 struct inet6_dev *idev = __in6_dev_get(dev); 5901 5902 if (idev) { 5903 idev->cnf.addr_gen_mode = 5904 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5905 } 5906 } 5907 } else { 5908 struct inet6_dev *idev = ctl->extra1; 5909 5910 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5911 } 5912 5913 out: 5914 rtnl_unlock(); 5915 5916 return err; 5917 } 5918 5919 static 5920 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5921 int write, 5922 void __user *buffer, 5923 size_t *lenp, 5924 loff_t *ppos) 5925 { 5926 int *valp = ctl->data; 5927 int val = *valp; 5928 loff_t pos = *ppos; 5929 struct ctl_table lctl; 5930 int ret; 5931 5932 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5933 * we should not modify it until we get the rtnl lock. 5934 */ 5935 lctl = *ctl; 5936 lctl.data = &val; 5937 5938 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5939 5940 if (write) 5941 ret = addrconf_fixup_linkdown(ctl, valp, val); 5942 if (ret) 5943 *ppos = pos; 5944 return ret; 5945 } 5946 5947 static 5948 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5949 { 5950 if (rt) { 5951 if (action) 5952 rt->dst.flags |= DST_NOPOLICY; 5953 else 5954 rt->dst.flags &= ~DST_NOPOLICY; 5955 } 5956 } 5957 5958 static 5959 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5960 { 5961 struct inet6_ifaddr *ifa; 5962 5963 read_lock_bh(&idev->lock); 5964 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5965 spin_lock(&ifa->lock); 5966 if (ifa->rt) { 5967 struct rt6_info *rt = ifa->rt; 5968 int cpu; 5969 5970 rcu_read_lock(); 5971 addrconf_set_nopolicy(ifa->rt, val); 5972 if (rt->rt6i_pcpu) { 5973 for_each_possible_cpu(cpu) { 5974 struct rt6_info **rtp; 5975 5976 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5977 addrconf_set_nopolicy(*rtp, val); 5978 } 5979 } 5980 rcu_read_unlock(); 5981 } 5982 spin_unlock(&ifa->lock); 5983 } 5984 read_unlock_bh(&idev->lock); 5985 } 5986 5987 static 5988 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5989 { 5990 struct inet6_dev *idev; 5991 struct net *net; 5992 5993 if (!rtnl_trylock()) 5994 return restart_syscall(); 5995 5996 *valp = val; 5997 5998 net = (struct net *)ctl->extra2; 5999 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6000 rtnl_unlock(); 6001 return 0; 6002 } 6003 6004 if (valp == &net->ipv6.devconf_all->disable_policy) { 6005 struct net_device *dev; 6006 6007 for_each_netdev(net, dev) { 6008 idev = __in6_dev_get(dev); 6009 if (idev) 6010 addrconf_disable_policy_idev(idev, val); 6011 } 6012 } else { 6013 idev = (struct inet6_dev *)ctl->extra1; 6014 addrconf_disable_policy_idev(idev, val); 6015 } 6016 6017 rtnl_unlock(); 6018 return 0; 6019 } 6020 6021 static 6022 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6023 void __user *buffer, size_t *lenp, 6024 loff_t *ppos) 6025 { 6026 int *valp = ctl->data; 6027 int val = *valp; 6028 loff_t pos = *ppos; 6029 struct ctl_table lctl; 6030 int ret; 6031 6032 lctl = *ctl; 6033 lctl.data = &val; 6034 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6035 6036 if (write && (*valp != val)) 6037 ret = addrconf_disable_policy(ctl, valp, val); 6038 6039 if (ret) 6040 *ppos = pos; 6041 6042 return ret; 6043 } 6044 6045 static int minus_one = -1; 6046 static const int zero = 0; 6047 static const int one = 1; 6048 static const int two_five_five = 255; 6049 6050 static const struct ctl_table addrconf_sysctl[] = { 6051 { 6052 .procname = "forwarding", 6053 .data = &ipv6_devconf.forwarding, 6054 .maxlen = sizeof(int), 6055 .mode = 0644, 6056 .proc_handler = addrconf_sysctl_forward, 6057 }, 6058 { 6059 .procname = "hop_limit", 6060 .data = &ipv6_devconf.hop_limit, 6061 .maxlen = sizeof(int), 6062 .mode = 0644, 6063 .proc_handler = proc_dointvec_minmax, 6064 .extra1 = (void *)&one, 6065 .extra2 = (void *)&two_five_five, 6066 }, 6067 { 6068 .procname = "mtu", 6069 .data = &ipv6_devconf.mtu6, 6070 .maxlen = sizeof(int), 6071 .mode = 0644, 6072 .proc_handler = addrconf_sysctl_mtu, 6073 }, 6074 { 6075 .procname = "accept_ra", 6076 .data = &ipv6_devconf.accept_ra, 6077 .maxlen = sizeof(int), 6078 .mode = 0644, 6079 .proc_handler = proc_dointvec, 6080 }, 6081 { 6082 .procname = "accept_redirects", 6083 .data = &ipv6_devconf.accept_redirects, 6084 .maxlen = sizeof(int), 6085 .mode = 0644, 6086 .proc_handler = proc_dointvec, 6087 }, 6088 { 6089 .procname = "autoconf", 6090 .data = &ipv6_devconf.autoconf, 6091 .maxlen = sizeof(int), 6092 .mode = 0644, 6093 .proc_handler = proc_dointvec, 6094 }, 6095 { 6096 .procname = "dad_transmits", 6097 .data = &ipv6_devconf.dad_transmits, 6098 .maxlen = sizeof(int), 6099 .mode = 0644, 6100 .proc_handler = proc_dointvec, 6101 }, 6102 { 6103 .procname = "router_solicitations", 6104 .data = &ipv6_devconf.rtr_solicits, 6105 .maxlen = sizeof(int), 6106 .mode = 0644, 6107 .proc_handler = proc_dointvec_minmax, 6108 .extra1 = &minus_one, 6109 }, 6110 { 6111 .procname = "router_solicitation_interval", 6112 .data = &ipv6_devconf.rtr_solicit_interval, 6113 .maxlen = sizeof(int), 6114 .mode = 0644, 6115 .proc_handler = proc_dointvec_jiffies, 6116 }, 6117 { 6118 .procname = "router_solicitation_max_interval", 6119 .data = &ipv6_devconf.rtr_solicit_max_interval, 6120 .maxlen = sizeof(int), 6121 .mode = 0644, 6122 .proc_handler = proc_dointvec_jiffies, 6123 }, 6124 { 6125 .procname = "router_solicitation_delay", 6126 .data = &ipv6_devconf.rtr_solicit_delay, 6127 .maxlen = sizeof(int), 6128 .mode = 0644, 6129 .proc_handler = proc_dointvec_jiffies, 6130 }, 6131 { 6132 .procname = "force_mld_version", 6133 .data = &ipv6_devconf.force_mld_version, 6134 .maxlen = sizeof(int), 6135 .mode = 0644, 6136 .proc_handler = proc_dointvec, 6137 }, 6138 { 6139 .procname = "mldv1_unsolicited_report_interval", 6140 .data = 6141 &ipv6_devconf.mldv1_unsolicited_report_interval, 6142 .maxlen = sizeof(int), 6143 .mode = 0644, 6144 .proc_handler = proc_dointvec_ms_jiffies, 6145 }, 6146 { 6147 .procname = "mldv2_unsolicited_report_interval", 6148 .data = 6149 &ipv6_devconf.mldv2_unsolicited_report_interval, 6150 .maxlen = sizeof(int), 6151 .mode = 0644, 6152 .proc_handler = proc_dointvec_ms_jiffies, 6153 }, 6154 { 6155 .procname = "use_tempaddr", 6156 .data = &ipv6_devconf.use_tempaddr, 6157 .maxlen = sizeof(int), 6158 .mode = 0644, 6159 .proc_handler = proc_dointvec, 6160 }, 6161 { 6162 .procname = "temp_valid_lft", 6163 .data = &ipv6_devconf.temp_valid_lft, 6164 .maxlen = sizeof(int), 6165 .mode = 0644, 6166 .proc_handler = proc_dointvec, 6167 }, 6168 { 6169 .procname = "temp_prefered_lft", 6170 .data = &ipv6_devconf.temp_prefered_lft, 6171 .maxlen = sizeof(int), 6172 .mode = 0644, 6173 .proc_handler = proc_dointvec, 6174 }, 6175 { 6176 .procname = "regen_max_retry", 6177 .data = &ipv6_devconf.regen_max_retry, 6178 .maxlen = sizeof(int), 6179 .mode = 0644, 6180 .proc_handler = proc_dointvec, 6181 }, 6182 { 6183 .procname = "max_desync_factor", 6184 .data = &ipv6_devconf.max_desync_factor, 6185 .maxlen = sizeof(int), 6186 .mode = 0644, 6187 .proc_handler = proc_dointvec, 6188 }, 6189 { 6190 .procname = "max_addresses", 6191 .data = &ipv6_devconf.max_addresses, 6192 .maxlen = sizeof(int), 6193 .mode = 0644, 6194 .proc_handler = proc_dointvec, 6195 }, 6196 { 6197 .procname = "accept_ra_defrtr", 6198 .data = &ipv6_devconf.accept_ra_defrtr, 6199 .maxlen = sizeof(int), 6200 .mode = 0644, 6201 .proc_handler = proc_dointvec, 6202 }, 6203 { 6204 .procname = "accept_ra_min_hop_limit", 6205 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6206 .maxlen = sizeof(int), 6207 .mode = 0644, 6208 .proc_handler = proc_dointvec, 6209 }, 6210 { 6211 .procname = "accept_ra_pinfo", 6212 .data = &ipv6_devconf.accept_ra_pinfo, 6213 .maxlen = sizeof(int), 6214 .mode = 0644, 6215 .proc_handler = proc_dointvec, 6216 }, 6217 #ifdef CONFIG_IPV6_ROUTER_PREF 6218 { 6219 .procname = "accept_ra_rtr_pref", 6220 .data = &ipv6_devconf.accept_ra_rtr_pref, 6221 .maxlen = sizeof(int), 6222 .mode = 0644, 6223 .proc_handler = proc_dointvec, 6224 }, 6225 { 6226 .procname = "router_probe_interval", 6227 .data = &ipv6_devconf.rtr_probe_interval, 6228 .maxlen = sizeof(int), 6229 .mode = 0644, 6230 .proc_handler = proc_dointvec_jiffies, 6231 }, 6232 #ifdef CONFIG_IPV6_ROUTE_INFO 6233 { 6234 .procname = "accept_ra_rt_info_min_plen", 6235 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6236 .maxlen = sizeof(int), 6237 .mode = 0644, 6238 .proc_handler = proc_dointvec, 6239 }, 6240 { 6241 .procname = "accept_ra_rt_info_max_plen", 6242 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6243 .maxlen = sizeof(int), 6244 .mode = 0644, 6245 .proc_handler = proc_dointvec, 6246 }, 6247 #endif 6248 #endif 6249 { 6250 .procname = "proxy_ndp", 6251 .data = &ipv6_devconf.proxy_ndp, 6252 .maxlen = sizeof(int), 6253 .mode = 0644, 6254 .proc_handler = addrconf_sysctl_proxy_ndp, 6255 }, 6256 { 6257 .procname = "accept_source_route", 6258 .data = &ipv6_devconf.accept_source_route, 6259 .maxlen = sizeof(int), 6260 .mode = 0644, 6261 .proc_handler = proc_dointvec, 6262 }, 6263 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6264 { 6265 .procname = "optimistic_dad", 6266 .data = &ipv6_devconf.optimistic_dad, 6267 .maxlen = sizeof(int), 6268 .mode = 0644, 6269 .proc_handler = proc_dointvec, 6270 }, 6271 { 6272 .procname = "use_optimistic", 6273 .data = &ipv6_devconf.use_optimistic, 6274 .maxlen = sizeof(int), 6275 .mode = 0644, 6276 .proc_handler = proc_dointvec, 6277 }, 6278 #endif 6279 #ifdef CONFIG_IPV6_MROUTE 6280 { 6281 .procname = "mc_forwarding", 6282 .data = &ipv6_devconf.mc_forwarding, 6283 .maxlen = sizeof(int), 6284 .mode = 0444, 6285 .proc_handler = proc_dointvec, 6286 }, 6287 #endif 6288 { 6289 .procname = "disable_ipv6", 6290 .data = &ipv6_devconf.disable_ipv6, 6291 .maxlen = sizeof(int), 6292 .mode = 0644, 6293 .proc_handler = addrconf_sysctl_disable, 6294 }, 6295 { 6296 .procname = "accept_dad", 6297 .data = &ipv6_devconf.accept_dad, 6298 .maxlen = sizeof(int), 6299 .mode = 0644, 6300 .proc_handler = proc_dointvec, 6301 }, 6302 { 6303 .procname = "force_tllao", 6304 .data = &ipv6_devconf.force_tllao, 6305 .maxlen = sizeof(int), 6306 .mode = 0644, 6307 .proc_handler = proc_dointvec 6308 }, 6309 { 6310 .procname = "ndisc_notify", 6311 .data = &ipv6_devconf.ndisc_notify, 6312 .maxlen = sizeof(int), 6313 .mode = 0644, 6314 .proc_handler = proc_dointvec 6315 }, 6316 { 6317 .procname = "suppress_frag_ndisc", 6318 .data = &ipv6_devconf.suppress_frag_ndisc, 6319 .maxlen = sizeof(int), 6320 .mode = 0644, 6321 .proc_handler = proc_dointvec 6322 }, 6323 { 6324 .procname = "accept_ra_from_local", 6325 .data = &ipv6_devconf.accept_ra_from_local, 6326 .maxlen = sizeof(int), 6327 .mode = 0644, 6328 .proc_handler = proc_dointvec, 6329 }, 6330 { 6331 .procname = "accept_ra_mtu", 6332 .data = &ipv6_devconf.accept_ra_mtu, 6333 .maxlen = sizeof(int), 6334 .mode = 0644, 6335 .proc_handler = proc_dointvec, 6336 }, 6337 { 6338 .procname = "stable_secret", 6339 .data = &ipv6_devconf.stable_secret, 6340 .maxlen = IPV6_MAX_STRLEN, 6341 .mode = 0600, 6342 .proc_handler = addrconf_sysctl_stable_secret, 6343 }, 6344 { 6345 .procname = "use_oif_addrs_only", 6346 .data = &ipv6_devconf.use_oif_addrs_only, 6347 .maxlen = sizeof(int), 6348 .mode = 0644, 6349 .proc_handler = proc_dointvec, 6350 }, 6351 { 6352 .procname = "ignore_routes_with_linkdown", 6353 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6354 .maxlen = sizeof(int), 6355 .mode = 0644, 6356 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6357 }, 6358 { 6359 .procname = "drop_unicast_in_l2_multicast", 6360 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6361 .maxlen = sizeof(int), 6362 .mode = 0644, 6363 .proc_handler = proc_dointvec, 6364 }, 6365 { 6366 .procname = "drop_unsolicited_na", 6367 .data = &ipv6_devconf.drop_unsolicited_na, 6368 .maxlen = sizeof(int), 6369 .mode = 0644, 6370 .proc_handler = proc_dointvec, 6371 }, 6372 { 6373 .procname = "keep_addr_on_down", 6374 .data = &ipv6_devconf.keep_addr_on_down, 6375 .maxlen = sizeof(int), 6376 .mode = 0644, 6377 .proc_handler = proc_dointvec, 6378 6379 }, 6380 { 6381 .procname = "seg6_enabled", 6382 .data = &ipv6_devconf.seg6_enabled, 6383 .maxlen = sizeof(int), 6384 .mode = 0644, 6385 .proc_handler = proc_dointvec, 6386 }, 6387 #ifdef CONFIG_IPV6_SEG6_HMAC 6388 { 6389 .procname = "seg6_require_hmac", 6390 .data = &ipv6_devconf.seg6_require_hmac, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec, 6394 }, 6395 #endif 6396 { 6397 .procname = "enhanced_dad", 6398 .data = &ipv6_devconf.enhanced_dad, 6399 .maxlen = sizeof(int), 6400 .mode = 0644, 6401 .proc_handler = proc_dointvec, 6402 }, 6403 { 6404 .procname = "addr_gen_mode", 6405 .data = &ipv6_devconf.addr_gen_mode, 6406 .maxlen = sizeof(int), 6407 .mode = 0644, 6408 .proc_handler = addrconf_sysctl_addr_gen_mode, 6409 }, 6410 { 6411 .procname = "disable_policy", 6412 .data = &ipv6_devconf.disable_policy, 6413 .maxlen = sizeof(int), 6414 .mode = 0644, 6415 .proc_handler = addrconf_sysctl_disable_policy, 6416 }, 6417 { 6418 .procname = "ndisc_tclass", 6419 .data = &ipv6_devconf.ndisc_tclass, 6420 .maxlen = sizeof(int), 6421 .mode = 0644, 6422 .proc_handler = proc_dointvec_minmax, 6423 .extra1 = (void *)&zero, 6424 .extra2 = (void *)&two_five_five, 6425 }, 6426 { 6427 /* sentinel */ 6428 } 6429 }; 6430 6431 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6432 struct inet6_dev *idev, struct ipv6_devconf *p) 6433 { 6434 int i, ifindex; 6435 struct ctl_table *table; 6436 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6437 6438 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6439 if (!table) 6440 goto out; 6441 6442 for (i = 0; table[i].data; i++) { 6443 table[i].data += (char *)p - (char *)&ipv6_devconf; 6444 /* If one of these is already set, then it is not safe to 6445 * overwrite either of them: this makes proc_dointvec_minmax 6446 * usable. 6447 */ 6448 if (!table[i].extra1 && !table[i].extra2) { 6449 table[i].extra1 = idev; /* embedded; no ref */ 6450 table[i].extra2 = net; 6451 } 6452 } 6453 6454 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6455 6456 p->sysctl_header = register_net_sysctl(net, path, table); 6457 if (!p->sysctl_header) 6458 goto free; 6459 6460 if (!strcmp(dev_name, "all")) 6461 ifindex = NETCONFA_IFINDEX_ALL; 6462 else if (!strcmp(dev_name, "default")) 6463 ifindex = NETCONFA_IFINDEX_DEFAULT; 6464 else 6465 ifindex = idev->dev->ifindex; 6466 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6467 ifindex, p); 6468 return 0; 6469 6470 free: 6471 kfree(table); 6472 out: 6473 return -ENOBUFS; 6474 } 6475 6476 static void __addrconf_sysctl_unregister(struct net *net, 6477 struct ipv6_devconf *p, int ifindex) 6478 { 6479 struct ctl_table *table; 6480 6481 if (!p->sysctl_header) 6482 return; 6483 6484 table = p->sysctl_header->ctl_table_arg; 6485 unregister_net_sysctl_table(p->sysctl_header); 6486 p->sysctl_header = NULL; 6487 kfree(table); 6488 6489 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6490 } 6491 6492 static int addrconf_sysctl_register(struct inet6_dev *idev) 6493 { 6494 int err; 6495 6496 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6497 return -EINVAL; 6498 6499 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6500 &ndisc_ifinfo_sysctl_change); 6501 if (err) 6502 return err; 6503 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6504 idev, &idev->cnf); 6505 if (err) 6506 neigh_sysctl_unregister(idev->nd_parms); 6507 6508 return err; 6509 } 6510 6511 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6512 { 6513 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6514 idev->dev->ifindex); 6515 neigh_sysctl_unregister(idev->nd_parms); 6516 } 6517 6518 6519 #endif 6520 6521 static int __net_init addrconf_init_net(struct net *net) 6522 { 6523 int err = -ENOMEM; 6524 struct ipv6_devconf *all, *dflt; 6525 6526 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6527 if (!all) 6528 goto err_alloc_all; 6529 6530 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6531 if (!dflt) 6532 goto err_alloc_dflt; 6533 6534 /* these will be inherited by all namespaces */ 6535 dflt->autoconf = ipv6_defaults.autoconf; 6536 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6537 6538 dflt->stable_secret.initialized = false; 6539 all->stable_secret.initialized = false; 6540 6541 net->ipv6.devconf_all = all; 6542 net->ipv6.devconf_dflt = dflt; 6543 6544 #ifdef CONFIG_SYSCTL 6545 err = __addrconf_sysctl_register(net, "all", NULL, all); 6546 if (err < 0) 6547 goto err_reg_all; 6548 6549 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6550 if (err < 0) 6551 goto err_reg_dflt; 6552 #endif 6553 return 0; 6554 6555 #ifdef CONFIG_SYSCTL 6556 err_reg_dflt: 6557 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6558 err_reg_all: 6559 kfree(dflt); 6560 #endif 6561 err_alloc_dflt: 6562 kfree(all); 6563 err_alloc_all: 6564 return err; 6565 } 6566 6567 static void __net_exit addrconf_exit_net(struct net *net) 6568 { 6569 #ifdef CONFIG_SYSCTL 6570 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6571 NETCONFA_IFINDEX_DEFAULT); 6572 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6573 NETCONFA_IFINDEX_ALL); 6574 #endif 6575 kfree(net->ipv6.devconf_dflt); 6576 kfree(net->ipv6.devconf_all); 6577 } 6578 6579 static struct pernet_operations addrconf_ops = { 6580 .init = addrconf_init_net, 6581 .exit = addrconf_exit_net, 6582 }; 6583 6584 static struct rtnl_af_ops inet6_ops __read_mostly = { 6585 .family = AF_INET6, 6586 .fill_link_af = inet6_fill_link_af, 6587 .get_link_af_size = inet6_get_link_af_size, 6588 .validate_link_af = inet6_validate_link_af, 6589 .set_link_af = inet6_set_link_af, 6590 }; 6591 6592 /* 6593 * Init / cleanup code 6594 */ 6595 6596 int __init addrconf_init(void) 6597 { 6598 struct inet6_dev *idev; 6599 int i, err; 6600 6601 err = ipv6_addr_label_init(); 6602 if (err < 0) { 6603 pr_crit("%s: cannot initialize default policy table: %d\n", 6604 __func__, err); 6605 goto out; 6606 } 6607 6608 err = register_pernet_subsys(&addrconf_ops); 6609 if (err < 0) 6610 goto out_addrlabel; 6611 6612 addrconf_wq = create_workqueue("ipv6_addrconf"); 6613 if (!addrconf_wq) { 6614 err = -ENOMEM; 6615 goto out_nowq; 6616 } 6617 6618 /* The addrconf netdev notifier requires that loopback_dev 6619 * has it's ipv6 private information allocated and setup 6620 * before it can bring up and give link-local addresses 6621 * to other devices which are up. 6622 * 6623 * Unfortunately, loopback_dev is not necessarily the first 6624 * entry in the global dev_base list of net devices. In fact, 6625 * it is likely to be the very last entry on that list. 6626 * So this causes the notifier registry below to try and 6627 * give link-local addresses to all devices besides loopback_dev 6628 * first, then loopback_dev, which cases all the non-loopback_dev 6629 * devices to fail to get a link-local address. 6630 * 6631 * So, as a temporary fix, allocate the ipv6 structure for 6632 * loopback_dev first by hand. 6633 * Longer term, all of the dependencies ipv6 has upon the loopback 6634 * device and it being up should be removed. 6635 */ 6636 rtnl_lock(); 6637 idev = ipv6_add_dev(init_net.loopback_dev); 6638 rtnl_unlock(); 6639 if (IS_ERR(idev)) { 6640 err = PTR_ERR(idev); 6641 goto errlo; 6642 } 6643 6644 ip6_route_init_special_entries(); 6645 6646 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6647 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6648 6649 register_netdevice_notifier(&ipv6_dev_notf); 6650 6651 addrconf_verify(); 6652 6653 rtnl_af_register(&inet6_ops); 6654 6655 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6656 NULL, inet6_dump_ifinfo, 0); 6657 if (err < 0) 6658 goto errout; 6659 6660 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6661 inet6_rtm_newaddr, NULL, 0); 6662 if (err < 0) 6663 goto errout; 6664 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6665 inet6_rtm_deladdr, NULL, 0); 6666 if (err < 0) 6667 goto errout; 6668 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6669 inet6_rtm_getaddr, inet6_dump_ifaddr, 6670 RTNL_FLAG_DOIT_UNLOCKED); 6671 if (err < 0) 6672 goto errout; 6673 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6674 NULL, inet6_dump_ifmcaddr, 0); 6675 if (err < 0) 6676 goto errout; 6677 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6678 NULL, inet6_dump_ifacaddr, 0); 6679 if (err < 0) 6680 goto errout; 6681 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6682 inet6_netconf_get_devconf, 6683 inet6_netconf_dump_devconf, 6684 RTNL_FLAG_DOIT_UNLOCKED); 6685 if (err < 0) 6686 goto errout; 6687 err = ipv6_addr_label_rtnl_register(); 6688 if (err < 0) 6689 goto errout; 6690 6691 return 0; 6692 errout: 6693 rtnl_unregister_all(PF_INET6); 6694 rtnl_af_unregister(&inet6_ops); 6695 unregister_netdevice_notifier(&ipv6_dev_notf); 6696 errlo: 6697 destroy_workqueue(addrconf_wq); 6698 out_nowq: 6699 unregister_pernet_subsys(&addrconf_ops); 6700 out_addrlabel: 6701 ipv6_addr_label_cleanup(); 6702 out: 6703 return err; 6704 } 6705 6706 void addrconf_cleanup(void) 6707 { 6708 struct net_device *dev; 6709 int i; 6710 6711 unregister_netdevice_notifier(&ipv6_dev_notf); 6712 unregister_pernet_subsys(&addrconf_ops); 6713 ipv6_addr_label_cleanup(); 6714 6715 rtnl_af_unregister(&inet6_ops); 6716 6717 rtnl_lock(); 6718 6719 /* clean dev list */ 6720 for_each_netdev(&init_net, dev) { 6721 if (__in6_dev_get(dev) == NULL) 6722 continue; 6723 addrconf_ifdown(dev, 1); 6724 } 6725 addrconf_ifdown(init_net.loopback_dev, 2); 6726 6727 /* 6728 * Check hash table. 6729 */ 6730 spin_lock_bh(&addrconf_hash_lock); 6731 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6732 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6733 spin_unlock_bh(&addrconf_hash_lock); 6734 cancel_delayed_work(&addr_chk_work); 6735 rtnl_unlock(); 6736 6737 destroy_workqueue(addrconf_wq); 6738 } 6739