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 fib6_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; 388 389 ndev->cnf.mtu6 = dev->mtu; 390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 391 if (!ndev->nd_parms) { 392 kfree(ndev); 393 return ERR_PTR(err); 394 } 395 if (ndev->cnf.forwarding) 396 dev_disable_lro(dev); 397 /* We refer to the device */ 398 dev_hold(dev); 399 400 if (snmp6_alloc_dev(ndev) < 0) { 401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 402 __func__); 403 neigh_parms_release(&nd_tbl, ndev->nd_parms); 404 dev_put(dev); 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 409 if (snmp6_register_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 411 __func__, dev->name); 412 goto err_release; 413 } 414 415 /* One reference from device. */ 416 refcount_set(&ndev->refcnt, 1); 417 418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 419 ndev->cnf.accept_dad = -1; 420 421 #if IS_ENABLED(CONFIG_IPV6_SIT) 422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 423 pr_info("%s: Disabled Multicast RS\n", dev->name); 424 ndev->cnf.rtr_solicits = 0; 425 } 426 #endif 427 428 INIT_LIST_HEAD(&ndev->tempaddr_list); 429 ndev->desync_factor = U32_MAX; 430 if ((dev->flags&IFF_LOOPBACK) || 431 dev->type == ARPHRD_TUNNEL || 432 dev->type == ARPHRD_TUNNEL6 || 433 dev->type == ARPHRD_SIT || 434 dev->type == ARPHRD_NONE) { 435 ndev->cnf.use_tempaddr = -1; 436 } else 437 ipv6_regen_rndid(ndev); 438 439 ndev->token = in6addr_any; 440 441 if (netif_running(dev) && addrconf_link_ready(dev)) 442 ndev->if_flags |= IF_READY; 443 444 ipv6_mc_init_dev(ndev); 445 ndev->tstamp = jiffies; 446 err = addrconf_sysctl_register(ndev); 447 if (err) { 448 ipv6_mc_destroy_dev(ndev); 449 snmp6_unregister_dev(ndev); 450 goto err_release; 451 } 452 /* protected by rtnl_lock */ 453 rcu_assign_pointer(dev->ip6_ptr, ndev); 454 455 /* Join interface-local all-node multicast group */ 456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 457 458 /* Join all-node multicast group */ 459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 460 461 /* Join all-router multicast group if forwarding is set */ 462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 464 465 return ndev; 466 467 err_release: 468 neigh_parms_release(&nd_tbl, ndev->nd_parms); 469 ndev->dead = 1; 470 in6_dev_finish_destroy(ndev); 471 return ERR_PTR(err); 472 } 473 474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 475 { 476 struct inet6_dev *idev; 477 478 ASSERT_RTNL(); 479 480 idev = __in6_dev_get(dev); 481 if (!idev) { 482 idev = ipv6_add_dev(dev); 483 if (IS_ERR(idev)) 484 return NULL; 485 } 486 487 if (dev->flags&IFF_UP) 488 ipv6_mc_up(idev); 489 return idev; 490 } 491 492 static int inet6_netconf_msgsize_devconf(int type) 493 { 494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 495 + nla_total_size(4); /* NETCONFA_IFINDEX */ 496 bool all = false; 497 498 if (type == NETCONFA_ALL) 499 all = true; 500 501 if (all || type == NETCONFA_FORWARDING) 502 size += nla_total_size(4); 503 #ifdef CONFIG_IPV6_MROUTE 504 if (all || type == NETCONFA_MC_FORWARDING) 505 size += nla_total_size(4); 506 #endif 507 if (all || type == NETCONFA_PROXY_NEIGH) 508 size += nla_total_size(4); 509 510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 511 size += nla_total_size(4); 512 513 return size; 514 } 515 516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 517 struct ipv6_devconf *devconf, u32 portid, 518 u32 seq, int event, unsigned int flags, 519 int type) 520 { 521 struct nlmsghdr *nlh; 522 struct netconfmsg *ncm; 523 bool all = false; 524 525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 526 flags); 527 if (!nlh) 528 return -EMSGSIZE; 529 530 if (type == NETCONFA_ALL) 531 all = true; 532 533 ncm = nlmsg_data(nlh); 534 ncm->ncm_family = AF_INET6; 535 536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 537 goto nla_put_failure; 538 539 if (!devconf) 540 goto out; 541 542 if ((all || type == NETCONFA_FORWARDING) && 543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 544 goto nla_put_failure; 545 #ifdef CONFIG_IPV6_MROUTE 546 if ((all || type == NETCONFA_MC_FORWARDING) && 547 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 548 devconf->mc_forwarding) < 0) 549 goto nla_put_failure; 550 #endif 551 if ((all || type == NETCONFA_PROXY_NEIGH) && 552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 553 goto nla_put_failure; 554 555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 557 devconf->ignore_routes_with_linkdown) < 0) 558 goto nla_put_failure; 559 560 out: 561 nlmsg_end(skb, nlh); 562 return 0; 563 564 nla_put_failure: 565 nlmsg_cancel(skb, nlh); 566 return -EMSGSIZE; 567 } 568 569 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 570 int ifindex, struct ipv6_devconf *devconf) 571 { 572 struct sk_buff *skb; 573 int err = -ENOBUFS; 574 575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 576 if (!skb) 577 goto errout; 578 579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 580 event, 0, type); 581 if (err < 0) { 582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 583 WARN_ON(err == -EMSGSIZE); 584 kfree_skb(skb); 585 goto errout; 586 } 587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 588 return; 589 errout: 590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 591 } 592 593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 594 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 595 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 598 }; 599 600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 601 struct nlmsghdr *nlh, 602 struct netlink_ext_ack *extack) 603 { 604 struct net *net = sock_net(in_skb->sk); 605 struct nlattr *tb[NETCONFA_MAX+1]; 606 struct inet6_dev *in6_dev = NULL; 607 struct net_device *dev = NULL; 608 struct netconfmsg *ncm; 609 struct sk_buff *skb; 610 struct ipv6_devconf *devconf; 611 int ifindex; 612 int err; 613 614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 615 devconf_ipv6_policy, extack); 616 if (err < 0) 617 return err; 618 619 if (!tb[NETCONFA_IFINDEX]) 620 return -EINVAL; 621 622 err = -EINVAL; 623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 624 switch (ifindex) { 625 case NETCONFA_IFINDEX_ALL: 626 devconf = net->ipv6.devconf_all; 627 break; 628 case NETCONFA_IFINDEX_DEFAULT: 629 devconf = net->ipv6.devconf_dflt; 630 break; 631 default: 632 dev = dev_get_by_index(net, ifindex); 633 if (!dev) 634 return -EINVAL; 635 in6_dev = in6_dev_get(dev); 636 if (!in6_dev) 637 goto errout; 638 devconf = &in6_dev->cnf; 639 break; 640 } 641 642 err = -ENOBUFS; 643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 644 if (!skb) 645 goto errout; 646 647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 648 NETLINK_CB(in_skb).portid, 649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 650 NETCONFA_ALL); 651 if (err < 0) { 652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 653 WARN_ON(err == -EMSGSIZE); 654 kfree_skb(skb); 655 goto errout; 656 } 657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 658 errout: 659 if (in6_dev) 660 in6_dev_put(in6_dev); 661 if (dev) 662 dev_put(dev); 663 return err; 664 } 665 666 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 667 struct netlink_callback *cb) 668 { 669 struct net *net = sock_net(skb->sk); 670 int h, s_h; 671 int idx, s_idx; 672 struct net_device *dev; 673 struct inet6_dev *idev; 674 struct hlist_head *head; 675 676 s_h = cb->args[0]; 677 s_idx = idx = cb->args[1]; 678 679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 680 idx = 0; 681 head = &net->dev_index_head[h]; 682 rcu_read_lock(); 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 684 net->dev_base_seq; 685 hlist_for_each_entry_rcu(dev, head, index_hlist) { 686 if (idx < s_idx) 687 goto cont; 688 idev = __in6_dev_get(dev); 689 if (!idev) 690 goto cont; 691 692 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 693 &idev->cnf, 694 NETLINK_CB(cb->skb).portid, 695 cb->nlh->nlmsg_seq, 696 RTM_NEWNETCONF, 697 NLM_F_MULTI, 698 NETCONFA_ALL) < 0) { 699 rcu_read_unlock(); 700 goto done; 701 } 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 703 cont: 704 idx++; 705 } 706 rcu_read_unlock(); 707 } 708 if (h == NETDEV_HASHENTRIES) { 709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 710 net->ipv6.devconf_all, 711 NETLINK_CB(cb->skb).portid, 712 cb->nlh->nlmsg_seq, 713 RTM_NEWNETCONF, NLM_F_MULTI, 714 NETCONFA_ALL) < 0) 715 goto done; 716 else 717 h++; 718 } 719 if (h == NETDEV_HASHENTRIES + 1) { 720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 721 net->ipv6.devconf_dflt, 722 NETLINK_CB(cb->skb).portid, 723 cb->nlh->nlmsg_seq, 724 RTM_NEWNETCONF, NLM_F_MULTI, 725 NETCONFA_ALL) < 0) 726 goto done; 727 else 728 h++; 729 } 730 done: 731 cb->args[0] = h; 732 cb->args[1] = idx; 733 734 return skb->len; 735 } 736 737 #ifdef CONFIG_SYSCTL 738 static void dev_forward_change(struct inet6_dev *idev) 739 { 740 struct net_device *dev; 741 struct inet6_ifaddr *ifa; 742 743 if (!idev) 744 return; 745 dev = idev->dev; 746 if (idev->cnf.forwarding) 747 dev_disable_lro(dev); 748 if (dev->flags & IFF_MULTICAST) { 749 if (idev->cnf.forwarding) { 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 753 } else { 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 757 } 758 } 759 760 list_for_each_entry(ifa, &idev->addr_list, if_list) { 761 if (ifa->flags&IFA_F_TENTATIVE) 762 continue; 763 if (idev->cnf.forwarding) 764 addrconf_join_anycast(ifa); 765 else 766 addrconf_leave_anycast(ifa); 767 } 768 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 769 NETCONFA_FORWARDING, 770 dev->ifindex, &idev->cnf); 771 } 772 773 774 static void addrconf_forward_change(struct net *net, __s32 newf) 775 { 776 struct net_device *dev; 777 struct inet6_dev *idev; 778 779 for_each_netdev(net, dev) { 780 idev = __in6_dev_get(dev); 781 if (idev) { 782 int changed = (!idev->cnf.forwarding) ^ (!newf); 783 idev->cnf.forwarding = newf; 784 if (changed) 785 dev_forward_change(idev); 786 } 787 } 788 } 789 790 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 791 { 792 struct net *net; 793 int old; 794 795 if (!rtnl_trylock()) 796 return restart_syscall(); 797 798 net = (struct net *)table->extra2; 799 old = *p; 800 *p = newf; 801 802 if (p == &net->ipv6.devconf_dflt->forwarding) { 803 if ((!newf) ^ (!old)) 804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 805 NETCONFA_FORWARDING, 806 NETCONFA_IFINDEX_DEFAULT, 807 net->ipv6.devconf_dflt); 808 rtnl_unlock(); 809 return 0; 810 } 811 812 if (p == &net->ipv6.devconf_all->forwarding) { 813 int old_dflt = net->ipv6.devconf_dflt->forwarding; 814 815 net->ipv6.devconf_dflt->forwarding = newf; 816 if ((!newf) ^ (!old_dflt)) 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 818 NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 822 addrconf_forward_change(net, newf); 823 if ((!newf) ^ (!old)) 824 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 825 NETCONFA_FORWARDING, 826 NETCONFA_IFINDEX_ALL, 827 net->ipv6.devconf_all); 828 } else if ((!newf) ^ (!old)) 829 dev_forward_change((struct inet6_dev *)table->extra1); 830 rtnl_unlock(); 831 832 if (newf) 833 rt6_purge_dflt_routers(net); 834 return 1; 835 } 836 837 static void addrconf_linkdown_change(struct net *net, __s32 newf) 838 { 839 struct net_device *dev; 840 struct inet6_dev *idev; 841 842 for_each_netdev(net, dev) { 843 idev = __in6_dev_get(dev); 844 if (idev) { 845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 846 847 idev->cnf.ignore_routes_with_linkdown = newf; 848 if (changed) 849 inet6_netconf_notify_devconf(dev_net(dev), 850 RTM_NEWNETCONF, 851 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 852 dev->ifindex, 853 &idev->cnf); 854 } 855 } 856 } 857 858 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 859 { 860 struct net *net; 861 int old; 862 863 if (!rtnl_trylock()) 864 return restart_syscall(); 865 866 net = (struct net *)table->extra2; 867 old = *p; 868 *p = newf; 869 870 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 871 if ((!newf) ^ (!old)) 872 inet6_netconf_notify_devconf(net, 873 RTM_NEWNETCONF, 874 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 875 NETCONFA_IFINDEX_DEFAULT, 876 net->ipv6.devconf_dflt); 877 rtnl_unlock(); 878 return 0; 879 } 880 881 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 882 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 883 addrconf_linkdown_change(net, newf); 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, 886 RTM_NEWNETCONF, 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 888 NETCONFA_IFINDEX_ALL, 889 net->ipv6.devconf_all); 890 } 891 rtnl_unlock(); 892 893 return 1; 894 } 895 896 #endif 897 898 /* Nobody refers to this ifaddr, destroy it */ 899 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 900 { 901 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 902 903 #ifdef NET_REFCNT_DEBUG 904 pr_debug("%s\n", __func__); 905 #endif 906 907 in6_dev_put(ifp->idev); 908 909 if (cancel_delayed_work(&ifp->dad_work)) 910 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 911 ifp); 912 913 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 914 pr_warn("Freeing alive inet6 address %p\n", ifp); 915 return; 916 } 917 918 kfree_rcu(ifp, rcu); 919 } 920 921 static void 922 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 923 { 924 struct list_head *p; 925 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 926 927 /* 928 * Each device address list is sorted in order of scope - 929 * global before linklocal. 930 */ 931 list_for_each(p, &idev->addr_list) { 932 struct inet6_ifaddr *ifa 933 = list_entry(p, struct inet6_ifaddr, if_list); 934 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 935 break; 936 } 937 938 list_add_tail_rcu(&ifp->if_list, p); 939 } 940 941 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 942 { 943 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 944 945 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 946 } 947 948 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 949 struct net_device *dev, unsigned int hash) 950 { 951 struct inet6_ifaddr *ifp; 952 953 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 954 if (!net_eq(dev_net(ifp->idev->dev), net)) 955 continue; 956 if (ipv6_addr_equal(&ifp->addr, addr)) { 957 if (!dev || ifp->idev->dev == dev) 958 return true; 959 } 960 } 961 return false; 962 } 963 964 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 965 { 966 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 967 int err = 0; 968 969 spin_lock(&addrconf_hash_lock); 970 971 /* Ignore adding duplicate addresses on an interface */ 972 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 973 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 974 err = -EEXIST; 975 } else { 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 977 } 978 979 spin_unlock(&addrconf_hash_lock); 980 981 return err; 982 } 983 984 /* On success it returns ifp with increased reference count */ 985 986 static struct inet6_ifaddr * 987 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 988 bool can_block, struct netlink_ext_ack *extack) 989 { 990 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 991 int addr_type = ipv6_addr_type(cfg->pfx); 992 struct net *net = dev_net(idev->dev); 993 struct inet6_ifaddr *ifa = NULL; 994 struct fib6_info *f6i = NULL; 995 int err = 0; 996 997 if (addr_type == IPV6_ADDR_ANY || 998 addr_type & IPV6_ADDR_MULTICAST || 999 (!(idev->dev->flags & IFF_LOOPBACK) && 1000 addr_type & IPV6_ADDR_LOOPBACK)) 1001 return ERR_PTR(-EADDRNOTAVAIL); 1002 1003 if (idev->dead) { 1004 err = -ENODEV; /*XXX*/ 1005 goto out; 1006 } 1007 1008 if (idev->cnf.disable_ipv6) { 1009 err = -EACCES; 1010 goto out; 1011 } 1012 1013 /* validator notifier needs to be blocking; 1014 * do not call in atomic context 1015 */ 1016 if (can_block) { 1017 struct in6_validator_info i6vi = { 1018 .i6vi_addr = *cfg->pfx, 1019 .i6vi_dev = idev, 1020 .extack = extack, 1021 }; 1022 1023 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1024 err = notifier_to_errno(err); 1025 if (err < 0) 1026 goto out; 1027 } 1028 1029 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1030 if (!ifa) { 1031 err = -ENOBUFS; 1032 goto out; 1033 } 1034 1035 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1036 if (IS_ERR(f6i)) { 1037 err = PTR_ERR(f6i); 1038 f6i = NULL; 1039 goto out; 1040 } 1041 1042 if (net->ipv6.devconf_all->disable_policy || 1043 idev->cnf.disable_policy) 1044 f6i->dst_nopolicy = true; 1045 1046 neigh_parms_data_state_setall(idev->nd_parms); 1047 1048 ifa->addr = *cfg->pfx; 1049 if (cfg->peer_pfx) 1050 ifa->peer_addr = *cfg->peer_pfx; 1051 1052 spin_lock_init(&ifa->lock); 1053 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1054 INIT_HLIST_NODE(&ifa->addr_lst); 1055 ifa->scope = cfg->scope; 1056 ifa->prefix_len = cfg->plen; 1057 ifa->rt_priority = cfg->rt_priority; 1058 ifa->flags = cfg->ifa_flags; 1059 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1060 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1061 ifa->flags |= IFA_F_TENTATIVE; 1062 ifa->valid_lft = cfg->valid_lft; 1063 ifa->prefered_lft = cfg->preferred_lft; 1064 ifa->cstamp = ifa->tstamp = jiffies; 1065 ifa->tokenized = false; 1066 1067 ifa->rt = f6i; 1068 1069 ifa->idev = idev; 1070 in6_dev_hold(idev); 1071 1072 /* For caller */ 1073 refcount_set(&ifa->refcnt, 1); 1074 1075 rcu_read_lock_bh(); 1076 1077 err = ipv6_add_addr_hash(idev->dev, ifa); 1078 if (err < 0) { 1079 rcu_read_unlock_bh(); 1080 goto out; 1081 } 1082 1083 write_lock(&idev->lock); 1084 1085 /* Add to inet6_dev unicast addr list. */ 1086 ipv6_link_dev_addr(idev, ifa); 1087 1088 if (ifa->flags&IFA_F_TEMPORARY) { 1089 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1090 in6_ifa_hold(ifa); 1091 } 1092 1093 in6_ifa_hold(ifa); 1094 write_unlock(&idev->lock); 1095 1096 rcu_read_unlock_bh(); 1097 1098 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1099 out: 1100 if (unlikely(err < 0)) { 1101 fib6_info_release(f6i); 1102 1103 if (ifa) { 1104 if (ifa->idev) 1105 in6_dev_put(ifa->idev); 1106 kfree(ifa); 1107 } 1108 ifa = ERR_PTR(err); 1109 } 1110 1111 return ifa; 1112 } 1113 1114 enum cleanup_prefix_rt_t { 1115 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1116 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1117 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1118 }; 1119 1120 /* 1121 * Check, whether the prefix for ifp would still need a prefix route 1122 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1123 * constants. 1124 * 1125 * 1) we don't purge prefix if address was not permanent. 1126 * prefix is managed by its own lifetime. 1127 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1128 * 3) if there are no addresses, delete prefix. 1129 * 4) if there are still other permanent address(es), 1130 * corresponding prefix is still permanent. 1131 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1132 * don't purge the prefix, assume user space is managing it. 1133 * 6) otherwise, update prefix lifetime to the 1134 * longest valid lifetime among the corresponding 1135 * addresses on the device. 1136 * Note: subsequent RA will update lifetime. 1137 **/ 1138 static enum cleanup_prefix_rt_t 1139 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1140 { 1141 struct inet6_ifaddr *ifa; 1142 struct inet6_dev *idev = ifp->idev; 1143 unsigned long lifetime; 1144 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1145 1146 *expires = jiffies; 1147 1148 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1149 if (ifa == ifp) 1150 continue; 1151 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1152 ifp->prefix_len)) 1153 continue; 1154 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1155 return CLEANUP_PREFIX_RT_NOP; 1156 1157 action = CLEANUP_PREFIX_RT_EXPIRE; 1158 1159 spin_lock(&ifa->lock); 1160 1161 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1162 /* 1163 * Note: Because this address is 1164 * not permanent, lifetime < 1165 * LONG_MAX / HZ here. 1166 */ 1167 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1168 *expires = ifa->tstamp + lifetime * HZ; 1169 spin_unlock(&ifa->lock); 1170 } 1171 1172 return action; 1173 } 1174 1175 static void 1176 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1177 { 1178 struct fib6_info *f6i; 1179 1180 f6i = addrconf_get_prefix_route(&ifp->addr, 1181 ifp->prefix_len, 1182 ifp->idev->dev, 1183 0, RTF_GATEWAY | RTF_DEFAULT); 1184 if (f6i) { 1185 if (del_rt) 1186 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1187 else { 1188 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1189 fib6_set_expires(f6i, expires); 1190 fib6_info_release(f6i); 1191 } 1192 } 1193 } 1194 1195 1196 /* This function wants to get referenced ifp and releases it before return */ 1197 1198 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1199 { 1200 int state; 1201 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1202 unsigned long expires; 1203 1204 ASSERT_RTNL(); 1205 1206 spin_lock_bh(&ifp->lock); 1207 state = ifp->state; 1208 ifp->state = INET6_IFADDR_STATE_DEAD; 1209 spin_unlock_bh(&ifp->lock); 1210 1211 if (state == INET6_IFADDR_STATE_DEAD) 1212 goto out; 1213 1214 spin_lock_bh(&addrconf_hash_lock); 1215 hlist_del_init_rcu(&ifp->addr_lst); 1216 spin_unlock_bh(&addrconf_hash_lock); 1217 1218 write_lock_bh(&ifp->idev->lock); 1219 1220 if (ifp->flags&IFA_F_TEMPORARY) { 1221 list_del(&ifp->tmp_list); 1222 if (ifp->ifpub) { 1223 in6_ifa_put(ifp->ifpub); 1224 ifp->ifpub = NULL; 1225 } 1226 __in6_ifa_put(ifp); 1227 } 1228 1229 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1230 action = check_cleanup_prefix_route(ifp, &expires); 1231 1232 list_del_rcu(&ifp->if_list); 1233 __in6_ifa_put(ifp); 1234 1235 write_unlock_bh(&ifp->idev->lock); 1236 1237 addrconf_del_dad_work(ifp); 1238 1239 ipv6_ifa_notify(RTM_DELADDR, ifp); 1240 1241 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1242 1243 if (action != CLEANUP_PREFIX_RT_NOP) { 1244 cleanup_prefix_route(ifp, expires, 1245 action == CLEANUP_PREFIX_RT_DEL); 1246 } 1247 1248 /* clean up prefsrc entries */ 1249 rt6_remove_prefsrc(ifp); 1250 out: 1251 in6_ifa_put(ifp); 1252 } 1253 1254 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1255 struct inet6_ifaddr *ift, 1256 bool block) 1257 { 1258 struct inet6_dev *idev = ifp->idev; 1259 struct in6_addr addr, *tmpaddr; 1260 unsigned long tmp_tstamp, age; 1261 unsigned long regen_advance; 1262 struct ifa6_config cfg; 1263 int ret = 0; 1264 unsigned long now = jiffies; 1265 long max_desync_factor; 1266 s32 cnf_temp_preferred_lft; 1267 1268 write_lock_bh(&idev->lock); 1269 if (ift) { 1270 spin_lock_bh(&ift->lock); 1271 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1272 spin_unlock_bh(&ift->lock); 1273 tmpaddr = &addr; 1274 } else { 1275 tmpaddr = NULL; 1276 } 1277 retry: 1278 in6_dev_hold(idev); 1279 if (idev->cnf.use_tempaddr <= 0) { 1280 write_unlock_bh(&idev->lock); 1281 pr_info("%s: use_tempaddr is disabled\n", __func__); 1282 in6_dev_put(idev); 1283 ret = -1; 1284 goto out; 1285 } 1286 spin_lock_bh(&ifp->lock); 1287 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1288 idev->cnf.use_tempaddr = -1; /*XXX*/ 1289 spin_unlock_bh(&ifp->lock); 1290 write_unlock_bh(&idev->lock); 1291 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1292 __func__); 1293 in6_dev_put(idev); 1294 ret = -1; 1295 goto out; 1296 } 1297 in6_ifa_hold(ifp); 1298 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1299 ipv6_try_regen_rndid(idev, tmpaddr); 1300 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1301 age = (now - ifp->tstamp) / HZ; 1302 1303 regen_advance = idev->cnf.regen_max_retry * 1304 idev->cnf.dad_transmits * 1305 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1306 1307 /* recalculate max_desync_factor each time and update 1308 * idev->desync_factor if it's larger 1309 */ 1310 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1311 max_desync_factor = min_t(__u32, 1312 idev->cnf.max_desync_factor, 1313 cnf_temp_preferred_lft - regen_advance); 1314 1315 if (unlikely(idev->desync_factor > max_desync_factor)) { 1316 if (max_desync_factor > 0) { 1317 get_random_bytes(&idev->desync_factor, 1318 sizeof(idev->desync_factor)); 1319 idev->desync_factor %= max_desync_factor; 1320 } else { 1321 idev->desync_factor = 0; 1322 } 1323 } 1324 1325 memset(&cfg, 0, sizeof(cfg)); 1326 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1327 idev->cnf.temp_valid_lft + age); 1328 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1329 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1330 1331 cfg.plen = ifp->prefix_len; 1332 tmp_tstamp = ifp->tstamp; 1333 spin_unlock_bh(&ifp->lock); 1334 1335 write_unlock_bh(&idev->lock); 1336 1337 /* A temporary address is created only if this calculated Preferred 1338 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1339 * an implementation must not create a temporary address with a zero 1340 * Preferred Lifetime. 1341 * Use age calculation as in addrconf_verify to avoid unnecessary 1342 * temporary addresses being generated. 1343 */ 1344 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1345 if (cfg.preferred_lft <= regen_advance + age) { 1346 in6_ifa_put(ifp); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 1352 cfg.ifa_flags = IFA_F_TEMPORARY; 1353 /* set in addrconf_prefix_rcv() */ 1354 if (ifp->flags & IFA_F_OPTIMISTIC) 1355 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1356 1357 cfg.pfx = &addr; 1358 cfg.scope = ipv6_addr_scope(cfg.pfx); 1359 1360 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1361 if (IS_ERR(ift)) { 1362 in6_ifa_put(ifp); 1363 in6_dev_put(idev); 1364 pr_info("%s: retry temporary address regeneration\n", __func__); 1365 tmpaddr = &addr; 1366 write_lock_bh(&idev->lock); 1367 goto retry; 1368 } 1369 1370 spin_lock_bh(&ift->lock); 1371 ift->ifpub = ifp; 1372 ift->cstamp = now; 1373 ift->tstamp = tmp_tstamp; 1374 spin_unlock_bh(&ift->lock); 1375 1376 addrconf_dad_start(ift); 1377 in6_ifa_put(ift); 1378 in6_dev_put(idev); 1379 out: 1380 return ret; 1381 } 1382 1383 /* 1384 * Choose an appropriate source address (RFC3484) 1385 */ 1386 enum { 1387 IPV6_SADDR_RULE_INIT = 0, 1388 IPV6_SADDR_RULE_LOCAL, 1389 IPV6_SADDR_RULE_SCOPE, 1390 IPV6_SADDR_RULE_PREFERRED, 1391 #ifdef CONFIG_IPV6_MIP6 1392 IPV6_SADDR_RULE_HOA, 1393 #endif 1394 IPV6_SADDR_RULE_OIF, 1395 IPV6_SADDR_RULE_LABEL, 1396 IPV6_SADDR_RULE_PRIVACY, 1397 IPV6_SADDR_RULE_ORCHID, 1398 IPV6_SADDR_RULE_PREFIX, 1399 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1400 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1401 #endif 1402 IPV6_SADDR_RULE_MAX 1403 }; 1404 1405 struct ipv6_saddr_score { 1406 int rule; 1407 int addr_type; 1408 struct inet6_ifaddr *ifa; 1409 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1410 int scopedist; 1411 int matchlen; 1412 }; 1413 1414 struct ipv6_saddr_dst { 1415 const struct in6_addr *addr; 1416 int ifindex; 1417 int scope; 1418 int label; 1419 unsigned int prefs; 1420 }; 1421 1422 static inline int ipv6_saddr_preferred(int type) 1423 { 1424 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1425 return 1; 1426 return 0; 1427 } 1428 1429 static bool ipv6_use_optimistic_addr(struct net *net, 1430 struct inet6_dev *idev) 1431 { 1432 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1433 if (!idev) 1434 return false; 1435 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1436 return false; 1437 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1438 return false; 1439 1440 return true; 1441 #else 1442 return false; 1443 #endif 1444 } 1445 1446 static bool ipv6_allow_optimistic_dad(struct net *net, 1447 struct inet6_dev *idev) 1448 { 1449 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1450 if (!idev) 1451 return false; 1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1453 return false; 1454 1455 return true; 1456 #else 1457 return false; 1458 #endif 1459 } 1460 1461 static int ipv6_get_saddr_eval(struct net *net, 1462 struct ipv6_saddr_score *score, 1463 struct ipv6_saddr_dst *dst, 1464 int i) 1465 { 1466 int ret; 1467 1468 if (i <= score->rule) { 1469 switch (i) { 1470 case IPV6_SADDR_RULE_SCOPE: 1471 ret = score->scopedist; 1472 break; 1473 case IPV6_SADDR_RULE_PREFIX: 1474 ret = score->matchlen; 1475 break; 1476 default: 1477 ret = !!test_bit(i, score->scorebits); 1478 } 1479 goto out; 1480 } 1481 1482 switch (i) { 1483 case IPV6_SADDR_RULE_INIT: 1484 /* Rule 0: remember if hiscore is not ready yet */ 1485 ret = !!score->ifa; 1486 break; 1487 case IPV6_SADDR_RULE_LOCAL: 1488 /* Rule 1: Prefer same address */ 1489 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1490 break; 1491 case IPV6_SADDR_RULE_SCOPE: 1492 /* Rule 2: Prefer appropriate scope 1493 * 1494 * ret 1495 * ^ 1496 * -1 | d 15 1497 * ---+--+-+---> scope 1498 * | 1499 * | d is scope of the destination. 1500 * B-d | \ 1501 * | \ <- smaller scope is better if 1502 * B-15 | \ if scope is enough for destination. 1503 * | ret = B - scope (-1 <= scope >= d <= 15). 1504 * d-C-1 | / 1505 * |/ <- greater is better 1506 * -C / if scope is not enough for destination. 1507 * /| ret = scope - C (-1 <= d < scope <= 15). 1508 * 1509 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1510 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1511 * Assume B = 0 and we get C > 29. 1512 */ 1513 ret = __ipv6_addr_src_scope(score->addr_type); 1514 if (ret >= dst->scope) 1515 ret = -ret; 1516 else 1517 ret -= 128; /* 30 is enough */ 1518 score->scopedist = ret; 1519 break; 1520 case IPV6_SADDR_RULE_PREFERRED: 1521 { 1522 /* Rule 3: Avoid deprecated and optimistic addresses */ 1523 u8 avoid = IFA_F_DEPRECATED; 1524 1525 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1526 avoid |= IFA_F_OPTIMISTIC; 1527 ret = ipv6_saddr_preferred(score->addr_type) || 1528 !(score->ifa->flags & avoid); 1529 break; 1530 } 1531 #ifdef CONFIG_IPV6_MIP6 1532 case IPV6_SADDR_RULE_HOA: 1533 { 1534 /* Rule 4: Prefer home address */ 1535 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1536 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1537 break; 1538 } 1539 #endif 1540 case IPV6_SADDR_RULE_OIF: 1541 /* Rule 5: Prefer outgoing interface */ 1542 ret = (!dst->ifindex || 1543 dst->ifindex == score->ifa->idev->dev->ifindex); 1544 break; 1545 case IPV6_SADDR_RULE_LABEL: 1546 /* Rule 6: Prefer matching label */ 1547 ret = ipv6_addr_label(net, 1548 &score->ifa->addr, score->addr_type, 1549 score->ifa->idev->dev->ifindex) == dst->label; 1550 break; 1551 case IPV6_SADDR_RULE_PRIVACY: 1552 { 1553 /* Rule 7: Prefer public address 1554 * Note: prefer temporary address if use_tempaddr >= 2 1555 */ 1556 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1557 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1558 score->ifa->idev->cnf.use_tempaddr >= 2; 1559 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1560 break; 1561 } 1562 case IPV6_SADDR_RULE_ORCHID: 1563 /* Rule 8-: Prefer ORCHID vs ORCHID or 1564 * non-ORCHID vs non-ORCHID 1565 */ 1566 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1567 ipv6_addr_orchid(dst->addr)); 1568 break; 1569 case IPV6_SADDR_RULE_PREFIX: 1570 /* Rule 8: Use longest matching prefix */ 1571 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1572 if (ret > score->ifa->prefix_len) 1573 ret = score->ifa->prefix_len; 1574 score->matchlen = ret; 1575 break; 1576 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1577 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1578 /* Optimistic addresses still have lower precedence than other 1579 * preferred addresses. 1580 */ 1581 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1582 break; 1583 #endif 1584 default: 1585 ret = 0; 1586 } 1587 1588 if (ret) 1589 __set_bit(i, score->scorebits); 1590 score->rule = i; 1591 out: 1592 return ret; 1593 } 1594 1595 static int __ipv6_dev_get_saddr(struct net *net, 1596 struct ipv6_saddr_dst *dst, 1597 struct inet6_dev *idev, 1598 struct ipv6_saddr_score *scores, 1599 int hiscore_idx) 1600 { 1601 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1602 1603 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1604 int i; 1605 1606 /* 1607 * - Tentative Address (RFC2462 section 5.4) 1608 * - A tentative address is not considered 1609 * "assigned to an interface" in the traditional 1610 * sense, unless it is also flagged as optimistic. 1611 * - Candidate Source Address (section 4) 1612 * - In any case, anycast addresses, multicast 1613 * addresses, and the unspecified address MUST 1614 * NOT be included in a candidate set. 1615 */ 1616 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1617 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1618 continue; 1619 1620 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1621 1622 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1623 score->addr_type & IPV6_ADDR_MULTICAST)) { 1624 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1625 idev->dev->name); 1626 continue; 1627 } 1628 1629 score->rule = -1; 1630 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1631 1632 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1633 int minihiscore, miniscore; 1634 1635 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1636 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1637 1638 if (minihiscore > miniscore) { 1639 if (i == IPV6_SADDR_RULE_SCOPE && 1640 score->scopedist > 0) { 1641 /* 1642 * special case: 1643 * each remaining entry 1644 * has too small (not enough) 1645 * scope, because ifa entries 1646 * are sorted by their scope 1647 * values. 1648 */ 1649 goto out; 1650 } 1651 break; 1652 } else if (minihiscore < miniscore) { 1653 swap(hiscore, score); 1654 hiscore_idx = 1 - hiscore_idx; 1655 1656 /* restore our iterator */ 1657 score->ifa = hiscore->ifa; 1658 1659 break; 1660 } 1661 } 1662 } 1663 out: 1664 return hiscore_idx; 1665 } 1666 1667 static int ipv6_get_saddr_master(struct net *net, 1668 const struct net_device *dst_dev, 1669 const struct net_device *master, 1670 struct ipv6_saddr_dst *dst, 1671 struct ipv6_saddr_score *scores, 1672 int hiscore_idx) 1673 { 1674 struct inet6_dev *idev; 1675 1676 idev = __in6_dev_get(dst_dev); 1677 if (idev) 1678 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1679 scores, hiscore_idx); 1680 1681 idev = __in6_dev_get(master); 1682 if (idev) 1683 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1684 scores, hiscore_idx); 1685 1686 return hiscore_idx; 1687 } 1688 1689 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1690 const struct in6_addr *daddr, unsigned int prefs, 1691 struct in6_addr *saddr) 1692 { 1693 struct ipv6_saddr_score scores[2], *hiscore; 1694 struct ipv6_saddr_dst dst; 1695 struct inet6_dev *idev; 1696 struct net_device *dev; 1697 int dst_type; 1698 bool use_oif_addr = false; 1699 int hiscore_idx = 0; 1700 int ret = 0; 1701 1702 dst_type = __ipv6_addr_type(daddr); 1703 dst.addr = daddr; 1704 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1705 dst.scope = __ipv6_addr_src_scope(dst_type); 1706 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1707 dst.prefs = prefs; 1708 1709 scores[hiscore_idx].rule = -1; 1710 scores[hiscore_idx].ifa = NULL; 1711 1712 rcu_read_lock(); 1713 1714 /* Candidate Source Address (section 4) 1715 * - multicast and link-local destination address, 1716 * the set of candidate source address MUST only 1717 * include addresses assigned to interfaces 1718 * belonging to the same link as the outgoing 1719 * interface. 1720 * (- For site-local destination addresses, the 1721 * set of candidate source addresses MUST only 1722 * include addresses assigned to interfaces 1723 * belonging to the same site as the outgoing 1724 * interface.) 1725 * - "It is RECOMMENDED that the candidate source addresses 1726 * be the set of unicast addresses assigned to the 1727 * interface that will be used to send to the destination 1728 * (the 'outgoing' interface)." (RFC 6724) 1729 */ 1730 if (dst_dev) { 1731 idev = __in6_dev_get(dst_dev); 1732 if ((dst_type & IPV6_ADDR_MULTICAST) || 1733 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1734 (idev && idev->cnf.use_oif_addrs_only)) { 1735 use_oif_addr = true; 1736 } 1737 } 1738 1739 if (use_oif_addr) { 1740 if (idev) 1741 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1742 } else { 1743 const struct net_device *master; 1744 int master_idx = 0; 1745 1746 /* if dst_dev exists and is enslaved to an L3 device, then 1747 * prefer addresses from dst_dev and then the master over 1748 * any other enslaved devices in the L3 domain. 1749 */ 1750 master = l3mdev_master_dev_rcu(dst_dev); 1751 if (master) { 1752 master_idx = master->ifindex; 1753 1754 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1755 master, &dst, 1756 scores, hiscore_idx); 1757 1758 if (scores[hiscore_idx].ifa) 1759 goto out; 1760 } 1761 1762 for_each_netdev_rcu(net, dev) { 1763 /* only consider addresses on devices in the 1764 * same L3 domain 1765 */ 1766 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1767 continue; 1768 idev = __in6_dev_get(dev); 1769 if (!idev) 1770 continue; 1771 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1772 } 1773 } 1774 1775 out: 1776 hiscore = &scores[hiscore_idx]; 1777 if (!hiscore->ifa) 1778 ret = -EADDRNOTAVAIL; 1779 else 1780 *saddr = hiscore->ifa->addr; 1781 1782 rcu_read_unlock(); 1783 return ret; 1784 } 1785 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1786 1787 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1788 u32 banned_flags) 1789 { 1790 struct inet6_ifaddr *ifp; 1791 int err = -EADDRNOTAVAIL; 1792 1793 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1794 if (ifp->scope > IFA_LINK) 1795 break; 1796 if (ifp->scope == IFA_LINK && 1797 !(ifp->flags & banned_flags)) { 1798 *addr = ifp->addr; 1799 err = 0; 1800 break; 1801 } 1802 } 1803 return err; 1804 } 1805 1806 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1807 u32 banned_flags) 1808 { 1809 struct inet6_dev *idev; 1810 int err = -EADDRNOTAVAIL; 1811 1812 rcu_read_lock(); 1813 idev = __in6_dev_get(dev); 1814 if (idev) { 1815 read_lock_bh(&idev->lock); 1816 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1817 read_unlock_bh(&idev->lock); 1818 } 1819 rcu_read_unlock(); 1820 return err; 1821 } 1822 1823 static int ipv6_count_addresses(const struct inet6_dev *idev) 1824 { 1825 const struct inet6_ifaddr *ifp; 1826 int cnt = 0; 1827 1828 rcu_read_lock(); 1829 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1830 cnt++; 1831 rcu_read_unlock(); 1832 return cnt; 1833 } 1834 1835 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1836 const struct net_device *dev, int strict) 1837 { 1838 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1839 strict, IFA_F_TENTATIVE); 1840 } 1841 EXPORT_SYMBOL(ipv6_chk_addr); 1842 1843 /* device argument is used to find the L3 domain of interest. If 1844 * skip_dev_check is set, then the ifp device is not checked against 1845 * the passed in dev argument. So the 2 cases for addresses checks are: 1846 * 1. does the address exist in the L3 domain that dev is part of 1847 * (skip_dev_check = true), or 1848 * 1849 * 2. does the address exist on the specific device 1850 * (skip_dev_check = false) 1851 */ 1852 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1853 const struct net_device *dev, bool skip_dev_check, 1854 int strict, u32 banned_flags) 1855 { 1856 unsigned int hash = inet6_addr_hash(net, addr); 1857 const struct net_device *l3mdev; 1858 struct inet6_ifaddr *ifp; 1859 u32 ifp_flags; 1860 1861 rcu_read_lock(); 1862 1863 l3mdev = l3mdev_master_dev_rcu(dev); 1864 if (skip_dev_check) 1865 dev = NULL; 1866 1867 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1868 if (!net_eq(dev_net(ifp->idev->dev), net)) 1869 continue; 1870 1871 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1872 continue; 1873 1874 /* Decouple optimistic from tentative for evaluation here. 1875 * Ban optimistic addresses explicitly, when required. 1876 */ 1877 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1878 ? (ifp->flags&~IFA_F_TENTATIVE) 1879 : ifp->flags; 1880 if (ipv6_addr_equal(&ifp->addr, addr) && 1881 !(ifp_flags&banned_flags) && 1882 (!dev || ifp->idev->dev == dev || 1883 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1884 rcu_read_unlock(); 1885 return 1; 1886 } 1887 } 1888 1889 rcu_read_unlock(); 1890 return 0; 1891 } 1892 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1893 1894 1895 /* Compares an address/prefix_len with addresses on device @dev. 1896 * If one is found it returns true. 1897 */ 1898 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1899 const unsigned int prefix_len, struct net_device *dev) 1900 { 1901 const struct inet6_ifaddr *ifa; 1902 const struct inet6_dev *idev; 1903 bool ret = false; 1904 1905 rcu_read_lock(); 1906 idev = __in6_dev_get(dev); 1907 if (idev) { 1908 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1909 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1910 if (ret) 1911 break; 1912 } 1913 } 1914 rcu_read_unlock(); 1915 1916 return ret; 1917 } 1918 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1919 1920 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1921 { 1922 const struct inet6_ifaddr *ifa; 1923 const struct inet6_dev *idev; 1924 int onlink; 1925 1926 onlink = 0; 1927 rcu_read_lock(); 1928 idev = __in6_dev_get(dev); 1929 if (idev) { 1930 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1931 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1932 ifa->prefix_len); 1933 if (onlink) 1934 break; 1935 } 1936 } 1937 rcu_read_unlock(); 1938 return onlink; 1939 } 1940 EXPORT_SYMBOL(ipv6_chk_prefix); 1941 1942 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1943 struct net_device *dev, int strict) 1944 { 1945 unsigned int hash = inet6_addr_hash(net, addr); 1946 struct inet6_ifaddr *ifp, *result = NULL; 1947 1948 rcu_read_lock(); 1949 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1950 if (!net_eq(dev_net(ifp->idev->dev), net)) 1951 continue; 1952 if (ipv6_addr_equal(&ifp->addr, addr)) { 1953 if (!dev || ifp->idev->dev == dev || 1954 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1955 result = ifp; 1956 in6_ifa_hold(ifp); 1957 break; 1958 } 1959 } 1960 } 1961 rcu_read_unlock(); 1962 1963 return result; 1964 } 1965 1966 /* Gets referenced address, destroys ifaddr */ 1967 1968 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1969 { 1970 if (dad_failed) 1971 ifp->flags |= IFA_F_DADFAILED; 1972 1973 if (ifp->flags&IFA_F_TEMPORARY) { 1974 struct inet6_ifaddr *ifpub; 1975 spin_lock_bh(&ifp->lock); 1976 ifpub = ifp->ifpub; 1977 if (ifpub) { 1978 in6_ifa_hold(ifpub); 1979 spin_unlock_bh(&ifp->lock); 1980 ipv6_create_tempaddr(ifpub, ifp, true); 1981 in6_ifa_put(ifpub); 1982 } else { 1983 spin_unlock_bh(&ifp->lock); 1984 } 1985 ipv6_del_addr(ifp); 1986 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1987 spin_lock_bh(&ifp->lock); 1988 addrconf_del_dad_work(ifp); 1989 ifp->flags |= IFA_F_TENTATIVE; 1990 if (dad_failed) 1991 ifp->flags &= ~IFA_F_OPTIMISTIC; 1992 spin_unlock_bh(&ifp->lock); 1993 if (dad_failed) 1994 ipv6_ifa_notify(0, ifp); 1995 in6_ifa_put(ifp); 1996 } else { 1997 ipv6_del_addr(ifp); 1998 } 1999 } 2000 2001 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2002 { 2003 int err = -ENOENT; 2004 2005 spin_lock_bh(&ifp->lock); 2006 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2007 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2008 err = 0; 2009 } 2010 spin_unlock_bh(&ifp->lock); 2011 2012 return err; 2013 } 2014 2015 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2016 { 2017 struct inet6_dev *idev = ifp->idev; 2018 struct net *net = dev_net(ifp->idev->dev); 2019 2020 if (addrconf_dad_end(ifp)) { 2021 in6_ifa_put(ifp); 2022 return; 2023 } 2024 2025 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2026 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2027 2028 spin_lock_bh(&ifp->lock); 2029 2030 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2031 struct in6_addr new_addr; 2032 struct inet6_ifaddr *ifp2; 2033 int retries = ifp->stable_privacy_retry + 1; 2034 struct ifa6_config cfg = { 2035 .pfx = &new_addr, 2036 .plen = ifp->prefix_len, 2037 .ifa_flags = ifp->flags, 2038 .valid_lft = ifp->valid_lft, 2039 .preferred_lft = ifp->prefered_lft, 2040 .scope = ifp->scope, 2041 }; 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 spin_unlock_bh(&ifp->lock); 2055 2056 if (idev->cnf.max_addresses && 2057 ipv6_count_addresses(idev) >= 2058 idev->cnf.max_addresses) 2059 goto lock_errdad; 2060 2061 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2062 ifp->idev->dev->name); 2063 2064 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2065 if (IS_ERR(ifp2)) 2066 goto lock_errdad; 2067 2068 spin_lock_bh(&ifp2->lock); 2069 ifp2->stable_privacy_retry = retries; 2070 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2071 spin_unlock_bh(&ifp2->lock); 2072 2073 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2074 in6_ifa_put(ifp2); 2075 lock_errdad: 2076 spin_lock_bh(&ifp->lock); 2077 } 2078 2079 errdad: 2080 /* transition from _POSTDAD to _ERRDAD */ 2081 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2082 spin_unlock_bh(&ifp->lock); 2083 2084 addrconf_mod_dad_work(ifp, 0); 2085 in6_ifa_put(ifp); 2086 } 2087 2088 /* Join to solicited addr multicast group. 2089 * caller must hold RTNL */ 2090 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2091 { 2092 struct in6_addr maddr; 2093 2094 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2095 return; 2096 2097 addrconf_addr_solict_mult(addr, &maddr); 2098 ipv6_dev_mc_inc(dev, &maddr); 2099 } 2100 2101 /* caller must hold RTNL */ 2102 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2103 { 2104 struct in6_addr maddr; 2105 2106 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2107 return; 2108 2109 addrconf_addr_solict_mult(addr, &maddr); 2110 __ipv6_dev_mc_dec(idev, &maddr); 2111 } 2112 2113 /* caller must hold RTNL */ 2114 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2115 { 2116 struct in6_addr addr; 2117 2118 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2119 return; 2120 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2121 if (ipv6_addr_any(&addr)) 2122 return; 2123 __ipv6_dev_ac_inc(ifp->idev, &addr); 2124 } 2125 2126 /* caller must hold RTNL */ 2127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2128 { 2129 struct in6_addr addr; 2130 2131 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2132 return; 2133 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2134 if (ipv6_addr_any(&addr)) 2135 return; 2136 __ipv6_dev_ac_dec(ifp->idev, &addr); 2137 } 2138 2139 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2140 { 2141 switch (dev->addr_len) { 2142 case ETH_ALEN: 2143 memcpy(eui, dev->dev_addr, 3); 2144 eui[3] = 0xFF; 2145 eui[4] = 0xFE; 2146 memcpy(eui + 5, dev->dev_addr + 3, 3); 2147 break; 2148 case EUI64_ADDR_LEN: 2149 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2150 eui[0] ^= 2; 2151 break; 2152 default: 2153 return -1; 2154 } 2155 2156 return 0; 2157 } 2158 2159 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2160 { 2161 union fwnet_hwaddr *ha; 2162 2163 if (dev->addr_len != FWNET_ALEN) 2164 return -1; 2165 2166 ha = (union fwnet_hwaddr *)dev->dev_addr; 2167 2168 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2169 eui[0] ^= 2; 2170 return 0; 2171 } 2172 2173 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2174 { 2175 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2176 if (dev->addr_len != ARCNET_ALEN) 2177 return -1; 2178 memset(eui, 0, 7); 2179 eui[7] = *(u8 *)dev->dev_addr; 2180 return 0; 2181 } 2182 2183 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2184 { 2185 if (dev->addr_len != INFINIBAND_ALEN) 2186 return -1; 2187 memcpy(eui, dev->dev_addr + 12, 8); 2188 eui[0] |= 2; 2189 return 0; 2190 } 2191 2192 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2193 { 2194 if (addr == 0) 2195 return -1; 2196 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2197 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2198 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2199 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2200 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2201 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2202 eui[1] = 0; 2203 eui[2] = 0x5E; 2204 eui[3] = 0xFE; 2205 memcpy(eui + 4, &addr, 4); 2206 return 0; 2207 } 2208 2209 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2210 { 2211 if (dev->priv_flags & IFF_ISATAP) 2212 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2213 return -1; 2214 } 2215 2216 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2217 { 2218 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2219 } 2220 2221 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2222 { 2223 memcpy(eui, dev->perm_addr, 3); 2224 memcpy(eui + 5, dev->perm_addr + 3, 3); 2225 eui[3] = 0xFF; 2226 eui[4] = 0xFE; 2227 eui[0] ^= 2; 2228 return 0; 2229 } 2230 2231 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2232 { 2233 switch (dev->type) { 2234 case ARPHRD_ETHER: 2235 case ARPHRD_FDDI: 2236 return addrconf_ifid_eui48(eui, dev); 2237 case ARPHRD_ARCNET: 2238 return addrconf_ifid_arcnet(eui, dev); 2239 case ARPHRD_INFINIBAND: 2240 return addrconf_ifid_infiniband(eui, dev); 2241 case ARPHRD_SIT: 2242 return addrconf_ifid_sit(eui, dev); 2243 case ARPHRD_IPGRE: 2244 case ARPHRD_TUNNEL: 2245 return addrconf_ifid_gre(eui, dev); 2246 case ARPHRD_6LOWPAN: 2247 return addrconf_ifid_6lowpan(eui, dev); 2248 case ARPHRD_IEEE1394: 2249 return addrconf_ifid_ieee1394(eui, dev); 2250 case ARPHRD_TUNNEL6: 2251 case ARPHRD_IP6GRE: 2252 case ARPHRD_RAWIP: 2253 return addrconf_ifid_ip6tnl(eui, dev); 2254 } 2255 return -1; 2256 } 2257 2258 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2259 { 2260 int err = -1; 2261 struct inet6_ifaddr *ifp; 2262 2263 read_lock_bh(&idev->lock); 2264 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2265 if (ifp->scope > IFA_LINK) 2266 break; 2267 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2268 memcpy(eui, ifp->addr.s6_addr+8, 8); 2269 err = 0; 2270 break; 2271 } 2272 } 2273 read_unlock_bh(&idev->lock); 2274 return err; 2275 } 2276 2277 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2278 static void ipv6_regen_rndid(struct inet6_dev *idev) 2279 { 2280 regen: 2281 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2282 idev->rndid[0] &= ~0x02; 2283 2284 /* 2285 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2286 * check if generated address is not inappropriate 2287 * 2288 * - Reserved subnet anycast (RFC 2526) 2289 * 11111101 11....11 1xxxxxxx 2290 * - ISATAP (RFC4214) 6.1 2291 * 00-00-5E-FE-xx-xx-xx-xx 2292 * - value 0 2293 * - XXX: already assigned to an address on the device 2294 */ 2295 if (idev->rndid[0] == 0xfd && 2296 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2297 (idev->rndid[7]&0x80)) 2298 goto regen; 2299 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2300 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2301 goto regen; 2302 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2303 goto regen; 2304 } 2305 } 2306 2307 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2308 { 2309 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2310 ipv6_regen_rndid(idev); 2311 } 2312 2313 /* 2314 * Add prefix route. 2315 */ 2316 2317 static void 2318 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2319 struct net_device *dev, unsigned long expires, 2320 u32 flags, gfp_t gfp_flags) 2321 { 2322 struct fib6_config cfg = { 2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2324 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2325 .fc_ifindex = dev->ifindex, 2326 .fc_expires = expires, 2327 .fc_dst_len = plen, 2328 .fc_flags = RTF_UP | flags, 2329 .fc_nlinfo.nl_net = dev_net(dev), 2330 .fc_protocol = RTPROT_KERNEL, 2331 .fc_type = RTN_UNICAST, 2332 }; 2333 2334 cfg.fc_dst = *pfx; 2335 2336 /* Prevent useless cloning on PtP SIT. 2337 This thing is done here expecting that the whole 2338 class of non-broadcast devices need not cloning. 2339 */ 2340 #if IS_ENABLED(CONFIG_IPV6_SIT) 2341 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2342 cfg.fc_flags |= RTF_NONEXTHOP; 2343 #endif 2344 2345 ip6_route_add(&cfg, gfp_flags, NULL); 2346 } 2347 2348 2349 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2350 int plen, 2351 const struct net_device *dev, 2352 u32 flags, u32 noflags) 2353 { 2354 struct fib6_node *fn; 2355 struct fib6_info *rt = NULL; 2356 struct fib6_table *table; 2357 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2358 2359 table = fib6_get_table(dev_net(dev), tb_id); 2360 if (!table) 2361 return NULL; 2362 2363 rcu_read_lock(); 2364 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2365 if (!fn) 2366 goto out; 2367 2368 for_each_fib6_node_rt_rcu(fn) { 2369 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2370 continue; 2371 if ((rt->fib6_flags & flags) != flags) 2372 continue; 2373 if ((rt->fib6_flags & noflags) != 0) 2374 continue; 2375 if (!fib6_info_hold_safe(rt)) 2376 continue; 2377 break; 2378 } 2379 out: 2380 rcu_read_unlock(); 2381 return rt; 2382 } 2383 2384 2385 /* Create "default" multicast route to the interface */ 2386 2387 static void addrconf_add_mroute(struct net_device *dev) 2388 { 2389 struct fib6_config cfg = { 2390 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2391 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2392 .fc_ifindex = dev->ifindex, 2393 .fc_dst_len = 8, 2394 .fc_flags = RTF_UP, 2395 .fc_type = RTN_UNICAST, 2396 .fc_nlinfo.nl_net = dev_net(dev), 2397 }; 2398 2399 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2400 2401 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2402 } 2403 2404 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2405 { 2406 struct inet6_dev *idev; 2407 2408 ASSERT_RTNL(); 2409 2410 idev = ipv6_find_idev(dev); 2411 if (!idev) 2412 return ERR_PTR(-ENOBUFS); 2413 2414 if (idev->cnf.disable_ipv6) 2415 return ERR_PTR(-EACCES); 2416 2417 /* Add default multicast route */ 2418 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2419 addrconf_add_mroute(dev); 2420 2421 return idev; 2422 } 2423 2424 static void manage_tempaddrs(struct inet6_dev *idev, 2425 struct inet6_ifaddr *ifp, 2426 __u32 valid_lft, __u32 prefered_lft, 2427 bool create, unsigned long now) 2428 { 2429 u32 flags; 2430 struct inet6_ifaddr *ift; 2431 2432 read_lock_bh(&idev->lock); 2433 /* update all temporary addresses in the list */ 2434 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2435 int age, max_valid, max_prefered; 2436 2437 if (ifp != ift->ifpub) 2438 continue; 2439 2440 /* RFC 4941 section 3.3: 2441 * If a received option will extend the lifetime of a public 2442 * address, the lifetimes of temporary addresses should 2443 * be extended, subject to the overall constraint that no 2444 * temporary addresses should ever remain "valid" or "preferred" 2445 * for a time longer than (TEMP_VALID_LIFETIME) or 2446 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2447 */ 2448 age = (now - ift->cstamp) / HZ; 2449 max_valid = idev->cnf.temp_valid_lft - age; 2450 if (max_valid < 0) 2451 max_valid = 0; 2452 2453 max_prefered = idev->cnf.temp_prefered_lft - 2454 idev->desync_factor - age; 2455 if (max_prefered < 0) 2456 max_prefered = 0; 2457 2458 if (valid_lft > max_valid) 2459 valid_lft = max_valid; 2460 2461 if (prefered_lft > max_prefered) 2462 prefered_lft = max_prefered; 2463 2464 spin_lock(&ift->lock); 2465 flags = ift->flags; 2466 ift->valid_lft = valid_lft; 2467 ift->prefered_lft = prefered_lft; 2468 ift->tstamp = now; 2469 if (prefered_lft > 0) 2470 ift->flags &= ~IFA_F_DEPRECATED; 2471 2472 spin_unlock(&ift->lock); 2473 if (!(flags&IFA_F_TENTATIVE)) 2474 ipv6_ifa_notify(0, ift); 2475 } 2476 2477 if ((create || list_empty(&idev->tempaddr_list)) && 2478 idev->cnf.use_tempaddr > 0) { 2479 /* When a new public address is created as described 2480 * in [ADDRCONF], also create a new temporary address. 2481 * Also create a temporary address if it's enabled but 2482 * no temporary address currently exists. 2483 */ 2484 read_unlock_bh(&idev->lock); 2485 ipv6_create_tempaddr(ifp, NULL, false); 2486 } else { 2487 read_unlock_bh(&idev->lock); 2488 } 2489 } 2490 2491 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2492 { 2493 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2494 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2495 } 2496 2497 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2498 const struct prefix_info *pinfo, 2499 struct inet6_dev *in6_dev, 2500 const struct in6_addr *addr, int addr_type, 2501 u32 addr_flags, bool sllao, bool tokenized, 2502 __u32 valid_lft, u32 prefered_lft) 2503 { 2504 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2505 int create = 0, update_lft = 0; 2506 2507 if (!ifp && valid_lft) { 2508 int max_addresses = in6_dev->cnf.max_addresses; 2509 struct ifa6_config cfg = { 2510 .pfx = addr, 2511 .plen = pinfo->prefix_len, 2512 .ifa_flags = addr_flags, 2513 .valid_lft = valid_lft, 2514 .preferred_lft = prefered_lft, 2515 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2516 }; 2517 2518 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2519 if ((net->ipv6.devconf_all->optimistic_dad || 2520 in6_dev->cnf.optimistic_dad) && 2521 !net->ipv6.devconf_all->forwarding && sllao) 2522 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2523 #endif 2524 2525 /* Do not allow to create too much of autoconfigured 2526 * addresses; this would be too easy way to crash kernel. 2527 */ 2528 if (!max_addresses || 2529 ipv6_count_addresses(in6_dev) < max_addresses) 2530 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2531 2532 if (IS_ERR_OR_NULL(ifp)) 2533 return -1; 2534 2535 create = 1; 2536 spin_lock_bh(&ifp->lock); 2537 ifp->flags |= IFA_F_MANAGETEMPADDR; 2538 ifp->cstamp = jiffies; 2539 ifp->tokenized = tokenized; 2540 spin_unlock_bh(&ifp->lock); 2541 addrconf_dad_start(ifp); 2542 } 2543 2544 if (ifp) { 2545 u32 flags; 2546 unsigned long now; 2547 u32 stored_lft; 2548 2549 /* update lifetime (RFC2462 5.5.3 e) */ 2550 spin_lock_bh(&ifp->lock); 2551 now = jiffies; 2552 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2553 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2554 else 2555 stored_lft = 0; 2556 if (!create && stored_lft) { 2557 const u32 minimum_lft = min_t(u32, 2558 stored_lft, MIN_VALID_LIFETIME); 2559 valid_lft = max(valid_lft, minimum_lft); 2560 2561 /* RFC4862 Section 5.5.3e: 2562 * "Note that the preferred lifetime of the 2563 * corresponding address is always reset to 2564 * the Preferred Lifetime in the received 2565 * Prefix Information option, regardless of 2566 * whether the valid lifetime is also reset or 2567 * ignored." 2568 * 2569 * So we should always update prefered_lft here. 2570 */ 2571 update_lft = 1; 2572 } 2573 2574 if (update_lft) { 2575 ifp->valid_lft = valid_lft; 2576 ifp->prefered_lft = prefered_lft; 2577 ifp->tstamp = now; 2578 flags = ifp->flags; 2579 ifp->flags &= ~IFA_F_DEPRECATED; 2580 spin_unlock_bh(&ifp->lock); 2581 2582 if (!(flags&IFA_F_TENTATIVE)) 2583 ipv6_ifa_notify(0, ifp); 2584 } else 2585 spin_unlock_bh(&ifp->lock); 2586 2587 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2588 create, now); 2589 2590 in6_ifa_put(ifp); 2591 addrconf_verify(); 2592 } 2593 2594 return 0; 2595 } 2596 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2597 2598 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2599 { 2600 struct prefix_info *pinfo; 2601 __u32 valid_lft; 2602 __u32 prefered_lft; 2603 int addr_type, err; 2604 u32 addr_flags = 0; 2605 struct inet6_dev *in6_dev; 2606 struct net *net = dev_net(dev); 2607 2608 pinfo = (struct prefix_info *) opt; 2609 2610 if (len < sizeof(struct prefix_info)) { 2611 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2612 return; 2613 } 2614 2615 /* 2616 * Validation checks ([ADDRCONF], page 19) 2617 */ 2618 2619 addr_type = ipv6_addr_type(&pinfo->prefix); 2620 2621 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2622 return; 2623 2624 valid_lft = ntohl(pinfo->valid); 2625 prefered_lft = ntohl(pinfo->prefered); 2626 2627 if (prefered_lft > valid_lft) { 2628 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2629 return; 2630 } 2631 2632 in6_dev = in6_dev_get(dev); 2633 2634 if (!in6_dev) { 2635 net_dbg_ratelimited("addrconf: device %s not configured\n", 2636 dev->name); 2637 return; 2638 } 2639 2640 /* 2641 * Two things going on here: 2642 * 1) Add routes for on-link prefixes 2643 * 2) Configure prefixes with the auto flag set 2644 */ 2645 2646 if (pinfo->onlink) { 2647 struct fib6_info *rt; 2648 unsigned long rt_expires; 2649 2650 /* Avoid arithmetic overflow. Really, we could 2651 * save rt_expires in seconds, likely valid_lft, 2652 * but it would require division in fib gc, that it 2653 * not good. 2654 */ 2655 if (HZ > USER_HZ) 2656 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2657 else 2658 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2659 2660 if (addrconf_finite_timeout(rt_expires)) 2661 rt_expires *= HZ; 2662 2663 rt = addrconf_get_prefix_route(&pinfo->prefix, 2664 pinfo->prefix_len, 2665 dev, 2666 RTF_ADDRCONF | RTF_PREFIX_RT, 2667 RTF_GATEWAY | RTF_DEFAULT); 2668 2669 if (rt) { 2670 /* Autoconf prefix route */ 2671 if (valid_lft == 0) { 2672 ip6_del_rt(net, rt); 2673 rt = NULL; 2674 } else if (addrconf_finite_timeout(rt_expires)) { 2675 /* not infinity */ 2676 fib6_set_expires(rt, jiffies + rt_expires); 2677 } else { 2678 fib6_clean_expires(rt); 2679 } 2680 } else if (valid_lft) { 2681 clock_t expires = 0; 2682 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2683 if (addrconf_finite_timeout(rt_expires)) { 2684 /* not infinity */ 2685 flags |= RTF_EXPIRES; 2686 expires = jiffies_to_clock_t(rt_expires); 2687 } 2688 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2689 0, dev, expires, flags, 2690 GFP_ATOMIC); 2691 } 2692 fib6_info_release(rt); 2693 } 2694 2695 /* Try to figure out our local address for this prefix */ 2696 2697 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2698 struct in6_addr addr; 2699 bool tokenized = false, dev_addr_generated = false; 2700 2701 if (pinfo->prefix_len == 64) { 2702 memcpy(&addr, &pinfo->prefix, 8); 2703 2704 if (!ipv6_addr_any(&in6_dev->token)) { 2705 read_lock_bh(&in6_dev->lock); 2706 memcpy(addr.s6_addr + 8, 2707 in6_dev->token.s6_addr + 8, 8); 2708 read_unlock_bh(&in6_dev->lock); 2709 tokenized = true; 2710 } else if (is_addr_mode_generate_stable(in6_dev) && 2711 !ipv6_generate_stable_address(&addr, 0, 2712 in6_dev)) { 2713 addr_flags |= IFA_F_STABLE_PRIVACY; 2714 goto ok; 2715 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2716 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2717 goto put; 2718 } else { 2719 dev_addr_generated = true; 2720 } 2721 goto ok; 2722 } 2723 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2724 pinfo->prefix_len); 2725 goto put; 2726 2727 ok: 2728 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2729 &addr, addr_type, 2730 addr_flags, sllao, 2731 tokenized, valid_lft, 2732 prefered_lft); 2733 if (err) 2734 goto put; 2735 2736 /* Ignore error case here because previous prefix add addr was 2737 * successful which will be notified. 2738 */ 2739 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2740 addr_type, addr_flags, sllao, 2741 tokenized, valid_lft, 2742 prefered_lft, 2743 dev_addr_generated); 2744 } 2745 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2746 put: 2747 in6_dev_put(in6_dev); 2748 } 2749 2750 /* 2751 * Set destination address. 2752 * Special case for SIT interfaces where we create a new "virtual" 2753 * device. 2754 */ 2755 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2756 { 2757 struct in6_ifreq ireq; 2758 struct net_device *dev; 2759 int err = -EINVAL; 2760 2761 rtnl_lock(); 2762 2763 err = -EFAULT; 2764 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2765 goto err_exit; 2766 2767 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2768 2769 err = -ENODEV; 2770 if (!dev) 2771 goto err_exit; 2772 2773 #if IS_ENABLED(CONFIG_IPV6_SIT) 2774 if (dev->type == ARPHRD_SIT) { 2775 const struct net_device_ops *ops = dev->netdev_ops; 2776 struct ifreq ifr; 2777 struct ip_tunnel_parm p; 2778 2779 err = -EADDRNOTAVAIL; 2780 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2781 goto err_exit; 2782 2783 memset(&p, 0, sizeof(p)); 2784 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2785 p.iph.saddr = 0; 2786 p.iph.version = 4; 2787 p.iph.ihl = 5; 2788 p.iph.protocol = IPPROTO_IPV6; 2789 p.iph.ttl = 64; 2790 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2791 2792 if (ops->ndo_do_ioctl) { 2793 mm_segment_t oldfs = get_fs(); 2794 2795 set_fs(KERNEL_DS); 2796 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2797 set_fs(oldfs); 2798 } else 2799 err = -EOPNOTSUPP; 2800 2801 if (err == 0) { 2802 err = -ENOBUFS; 2803 dev = __dev_get_by_name(net, p.name); 2804 if (!dev) 2805 goto err_exit; 2806 err = dev_open(dev); 2807 } 2808 } 2809 #endif 2810 2811 err_exit: 2812 rtnl_unlock(); 2813 return err; 2814 } 2815 2816 static int ipv6_mc_config(struct sock *sk, bool join, 2817 const struct in6_addr *addr, int ifindex) 2818 { 2819 int ret; 2820 2821 ASSERT_RTNL(); 2822 2823 lock_sock(sk); 2824 if (join) 2825 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2826 else 2827 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2828 release_sock(sk); 2829 2830 return ret; 2831 } 2832 2833 /* 2834 * Manual configuration of address on an interface 2835 */ 2836 static int inet6_addr_add(struct net *net, int ifindex, 2837 struct ifa6_config *cfg, 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 u32 flags; 2846 2847 ASSERT_RTNL(); 2848 2849 if (cfg->plen > 128) 2850 return -EINVAL; 2851 2852 /* check the lifetime */ 2853 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2854 return -EINVAL; 2855 2856 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2857 return -EINVAL; 2858 2859 dev = __dev_get_by_index(net, ifindex); 2860 if (!dev) 2861 return -ENODEV; 2862 2863 idev = addrconf_add_dev(dev); 2864 if (IS_ERR(idev)) 2865 return PTR_ERR(idev); 2866 2867 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2869 true, cfg->pfx, ifindex); 2870 2871 if (ret < 0) 2872 return ret; 2873 } 2874 2875 cfg->scope = ipv6_addr_scope(cfg->pfx); 2876 2877 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2878 if (addrconf_finite_timeout(timeout)) { 2879 expires = jiffies_to_clock_t(timeout * HZ); 2880 cfg->valid_lft = timeout; 2881 flags = RTF_EXPIRES; 2882 } else { 2883 expires = 0; 2884 flags = 0; 2885 cfg->ifa_flags |= IFA_F_PERMANENT; 2886 } 2887 2888 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2889 if (addrconf_finite_timeout(timeout)) { 2890 if (timeout == 0) 2891 cfg->ifa_flags |= IFA_F_DEPRECATED; 2892 cfg->preferred_lft = timeout; 2893 } 2894 2895 ifp = ipv6_add_addr(idev, cfg, true, extack); 2896 if (!IS_ERR(ifp)) { 2897 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2899 ifp->rt_priority, dev, expires, 2900 flags, GFP_KERNEL); 2901 } 2902 2903 /* Send a netlink notification if DAD is enabled and 2904 * optimistic flag is not set 2905 */ 2906 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2907 ipv6_ifa_notify(0, ifp); 2908 /* 2909 * Note that section 3.1 of RFC 4429 indicates 2910 * that the Optimistic flag should not be set for 2911 * manually configured addresses 2912 */ 2913 addrconf_dad_start(ifp); 2914 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2915 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2916 cfg->preferred_lft, true, jiffies); 2917 in6_ifa_put(ifp); 2918 addrconf_verify_rtnl(); 2919 return 0; 2920 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2921 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2922 cfg->pfx, ifindex); 2923 } 2924 2925 return PTR_ERR(ifp); 2926 } 2927 2928 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2929 const struct in6_addr *pfx, unsigned int plen) 2930 { 2931 struct inet6_ifaddr *ifp; 2932 struct inet6_dev *idev; 2933 struct net_device *dev; 2934 2935 if (plen > 128) 2936 return -EINVAL; 2937 2938 dev = __dev_get_by_index(net, ifindex); 2939 if (!dev) 2940 return -ENODEV; 2941 2942 idev = __in6_dev_get(dev); 2943 if (!idev) 2944 return -ENXIO; 2945 2946 read_lock_bh(&idev->lock); 2947 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2948 if (ifp->prefix_len == plen && 2949 ipv6_addr_equal(pfx, &ifp->addr)) { 2950 in6_ifa_hold(ifp); 2951 read_unlock_bh(&idev->lock); 2952 2953 if (!(ifp->flags & IFA_F_TEMPORARY) && 2954 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2955 manage_tempaddrs(idev, ifp, 0, 0, false, 2956 jiffies); 2957 ipv6_del_addr(ifp); 2958 addrconf_verify_rtnl(); 2959 if (ipv6_addr_is_multicast(pfx)) { 2960 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2961 false, pfx, dev->ifindex); 2962 } 2963 return 0; 2964 } 2965 } 2966 read_unlock_bh(&idev->lock); 2967 return -EADDRNOTAVAIL; 2968 } 2969 2970 2971 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2972 { 2973 struct ifa6_config cfg = { 2974 .ifa_flags = IFA_F_PERMANENT, 2975 .preferred_lft = INFINITY_LIFE_TIME, 2976 .valid_lft = INFINITY_LIFE_TIME, 2977 }; 2978 struct in6_ifreq ireq; 2979 int err; 2980 2981 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2982 return -EPERM; 2983 2984 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2985 return -EFAULT; 2986 2987 cfg.pfx = &ireq.ifr6_addr; 2988 cfg.plen = ireq.ifr6_prefixlen; 2989 2990 rtnl_lock(); 2991 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 2992 rtnl_unlock(); 2993 return err; 2994 } 2995 2996 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2997 { 2998 struct in6_ifreq ireq; 2999 int err; 3000 3001 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3002 return -EPERM; 3003 3004 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3005 return -EFAULT; 3006 3007 rtnl_lock(); 3008 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3009 ireq.ifr6_prefixlen); 3010 rtnl_unlock(); 3011 return err; 3012 } 3013 3014 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3015 int plen, int scope) 3016 { 3017 struct inet6_ifaddr *ifp; 3018 struct ifa6_config cfg = { 3019 .pfx = addr, 3020 .plen = plen, 3021 .ifa_flags = IFA_F_PERMANENT, 3022 .valid_lft = INFINITY_LIFE_TIME, 3023 .preferred_lft = INFINITY_LIFE_TIME, 3024 .scope = scope 3025 }; 3026 3027 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3028 if (!IS_ERR(ifp)) { 3029 spin_lock_bh(&ifp->lock); 3030 ifp->flags &= ~IFA_F_TENTATIVE; 3031 spin_unlock_bh(&ifp->lock); 3032 rt_genid_bump_ipv6(dev_net(idev->dev)); 3033 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3034 in6_ifa_put(ifp); 3035 } 3036 } 3037 3038 #if IS_ENABLED(CONFIG_IPV6_SIT) 3039 static void sit_add_v4_addrs(struct inet6_dev *idev) 3040 { 3041 struct in6_addr addr; 3042 struct net_device *dev; 3043 struct net *net = dev_net(idev->dev); 3044 int scope, plen; 3045 u32 pflags = 0; 3046 3047 ASSERT_RTNL(); 3048 3049 memset(&addr, 0, sizeof(struct in6_addr)); 3050 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3051 3052 if (idev->dev->flags&IFF_POINTOPOINT) { 3053 addr.s6_addr32[0] = htonl(0xfe800000); 3054 scope = IFA_LINK; 3055 plen = 64; 3056 } else { 3057 scope = IPV6_ADDR_COMPATv4; 3058 plen = 96; 3059 pflags |= RTF_NONEXTHOP; 3060 } 3061 3062 if (addr.s6_addr32[3]) { 3063 add_addr(idev, &addr, plen, scope); 3064 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3065 GFP_KERNEL); 3066 return; 3067 } 3068 3069 for_each_netdev(net, dev) { 3070 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3071 if (in_dev && (dev->flags & IFF_UP)) { 3072 struct in_ifaddr *ifa; 3073 3074 int flag = scope; 3075 3076 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3077 3078 addr.s6_addr32[3] = ifa->ifa_local; 3079 3080 if (ifa->ifa_scope == RT_SCOPE_LINK) 3081 continue; 3082 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3083 if (idev->dev->flags&IFF_POINTOPOINT) 3084 continue; 3085 flag |= IFA_HOST; 3086 } 3087 3088 add_addr(idev, &addr, plen, flag); 3089 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3090 0, pflags, GFP_KERNEL); 3091 } 3092 } 3093 } 3094 } 3095 #endif 3096 3097 static void init_loopback(struct net_device *dev) 3098 { 3099 struct inet6_dev *idev; 3100 3101 /* ::1 */ 3102 3103 ASSERT_RTNL(); 3104 3105 idev = ipv6_find_idev(dev); 3106 if (!idev) { 3107 pr_debug("%s: add_dev failed\n", __func__); 3108 return; 3109 } 3110 3111 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3112 } 3113 3114 void addrconf_add_linklocal(struct inet6_dev *idev, 3115 const struct in6_addr *addr, u32 flags) 3116 { 3117 struct ifa6_config cfg = { 3118 .pfx = addr, 3119 .plen = 64, 3120 .ifa_flags = flags | IFA_F_PERMANENT, 3121 .valid_lft = INFINITY_LIFE_TIME, 3122 .preferred_lft = INFINITY_LIFE_TIME, 3123 .scope = IFA_LINK 3124 }; 3125 struct inet6_ifaddr *ifp; 3126 3127 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3128 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3129 idev->cnf.optimistic_dad) && 3130 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3131 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3132 #endif 3133 3134 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3135 if (!IS_ERR(ifp)) { 3136 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3137 0, 0, GFP_ATOMIC); 3138 addrconf_dad_start(ifp); 3139 in6_ifa_put(ifp); 3140 } 3141 } 3142 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3143 3144 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3145 { 3146 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3147 return true; 3148 3149 if (address.s6_addr32[2] == htonl(0x02005eff) && 3150 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3151 return true; 3152 3153 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3154 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3155 return true; 3156 3157 return false; 3158 } 3159 3160 static int ipv6_generate_stable_address(struct in6_addr *address, 3161 u8 dad_count, 3162 const struct inet6_dev *idev) 3163 { 3164 static DEFINE_SPINLOCK(lock); 3165 static __u32 digest[SHA_DIGEST_WORDS]; 3166 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3167 3168 static union { 3169 char __data[SHA_MESSAGE_BYTES]; 3170 struct { 3171 struct in6_addr secret; 3172 __be32 prefix[2]; 3173 unsigned char hwaddr[MAX_ADDR_LEN]; 3174 u8 dad_count; 3175 } __packed; 3176 } data; 3177 3178 struct in6_addr secret; 3179 struct in6_addr temp; 3180 struct net *net = dev_net(idev->dev); 3181 3182 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3183 3184 if (idev->cnf.stable_secret.initialized) 3185 secret = idev->cnf.stable_secret.secret; 3186 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3187 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3188 else 3189 return -1; 3190 3191 retry: 3192 spin_lock_bh(&lock); 3193 3194 sha_init(digest); 3195 memset(&data, 0, sizeof(data)); 3196 memset(workspace, 0, sizeof(workspace)); 3197 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3198 data.prefix[0] = address->s6_addr32[0]; 3199 data.prefix[1] = address->s6_addr32[1]; 3200 data.secret = secret; 3201 data.dad_count = dad_count; 3202 3203 sha_transform(digest, data.__data, workspace); 3204 3205 temp = *address; 3206 temp.s6_addr32[2] = (__force __be32)digest[0]; 3207 temp.s6_addr32[3] = (__force __be32)digest[1]; 3208 3209 spin_unlock_bh(&lock); 3210 3211 if (ipv6_reserved_interfaceid(temp)) { 3212 dad_count++; 3213 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3214 return -1; 3215 goto retry; 3216 } 3217 3218 *address = temp; 3219 return 0; 3220 } 3221 3222 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3223 { 3224 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3225 3226 if (s->initialized) 3227 return; 3228 s = &idev->cnf.stable_secret; 3229 get_random_bytes(&s->secret, sizeof(s->secret)); 3230 s->initialized = true; 3231 } 3232 3233 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3234 { 3235 struct in6_addr addr; 3236 3237 /* no link local addresses on L3 master devices */ 3238 if (netif_is_l3_master(idev->dev)) 3239 return; 3240 3241 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3242 3243 switch (idev->cnf.addr_gen_mode) { 3244 case IN6_ADDR_GEN_MODE_RANDOM: 3245 ipv6_gen_mode_random_init(idev); 3246 /* fallthrough */ 3247 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3248 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3249 addrconf_add_linklocal(idev, &addr, 3250 IFA_F_STABLE_PRIVACY); 3251 else if (prefix_route) 3252 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3253 0, 0, GFP_KERNEL); 3254 break; 3255 case IN6_ADDR_GEN_MODE_EUI64: 3256 /* addrconf_add_linklocal also adds a prefix_route and we 3257 * only need to care about prefix routes if ipv6_generate_eui64 3258 * couldn't generate one. 3259 */ 3260 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3261 addrconf_add_linklocal(idev, &addr, 0); 3262 else if (prefix_route) 3263 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3264 0, 0, GFP_KERNEL); 3265 break; 3266 case IN6_ADDR_GEN_MODE_NONE: 3267 default: 3268 /* will not add any link local address */ 3269 break; 3270 } 3271 } 3272 3273 static void addrconf_dev_config(struct net_device *dev) 3274 { 3275 struct inet6_dev *idev; 3276 3277 ASSERT_RTNL(); 3278 3279 if ((dev->type != ARPHRD_ETHER) && 3280 (dev->type != ARPHRD_FDDI) && 3281 (dev->type != ARPHRD_ARCNET) && 3282 (dev->type != ARPHRD_INFINIBAND) && 3283 (dev->type != ARPHRD_IEEE1394) && 3284 (dev->type != ARPHRD_TUNNEL6) && 3285 (dev->type != ARPHRD_6LOWPAN) && 3286 (dev->type != ARPHRD_IP6GRE) && 3287 (dev->type != ARPHRD_IPGRE) && 3288 (dev->type != ARPHRD_TUNNEL) && 3289 (dev->type != ARPHRD_NONE) && 3290 (dev->type != ARPHRD_RAWIP)) { 3291 /* Alas, we support only Ethernet autoconfiguration. */ 3292 return; 3293 } 3294 3295 idev = addrconf_add_dev(dev); 3296 if (IS_ERR(idev)) 3297 return; 3298 3299 /* this device type has no EUI support */ 3300 if (dev->type == ARPHRD_NONE && 3301 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3302 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3303 3304 addrconf_addr_gen(idev, false); 3305 } 3306 3307 #if IS_ENABLED(CONFIG_IPV6_SIT) 3308 static void addrconf_sit_config(struct net_device *dev) 3309 { 3310 struct inet6_dev *idev; 3311 3312 ASSERT_RTNL(); 3313 3314 /* 3315 * Configure the tunnel with one of our IPv4 3316 * addresses... we should configure all of 3317 * our v4 addrs in the tunnel 3318 */ 3319 3320 idev = ipv6_find_idev(dev); 3321 if (!idev) { 3322 pr_debug("%s: add_dev failed\n", __func__); 3323 return; 3324 } 3325 3326 if (dev->priv_flags & IFF_ISATAP) { 3327 addrconf_addr_gen(idev, false); 3328 return; 3329 } 3330 3331 sit_add_v4_addrs(idev); 3332 3333 if (dev->flags&IFF_POINTOPOINT) 3334 addrconf_add_mroute(dev); 3335 } 3336 #endif 3337 3338 #if IS_ENABLED(CONFIG_NET_IPGRE) 3339 static void addrconf_gre_config(struct net_device *dev) 3340 { 3341 struct inet6_dev *idev; 3342 3343 ASSERT_RTNL(); 3344 3345 idev = ipv6_find_idev(dev); 3346 if (!idev) { 3347 pr_debug("%s: add_dev failed\n", __func__); 3348 return; 3349 } 3350 3351 addrconf_addr_gen(idev, true); 3352 if (dev->flags & IFF_POINTOPOINT) 3353 addrconf_add_mroute(dev); 3354 } 3355 #endif 3356 3357 static int fixup_permanent_addr(struct net *net, 3358 struct inet6_dev *idev, 3359 struct inet6_ifaddr *ifp) 3360 { 3361 /* !fib6_node means the host route was removed from the 3362 * FIB, for example, if 'lo' device is taken down. In that 3363 * case regenerate the host route. 3364 */ 3365 if (!ifp->rt || !ifp->rt->fib6_node) { 3366 struct fib6_info *f6i, *prev; 3367 3368 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3369 GFP_ATOMIC); 3370 if (IS_ERR(f6i)) 3371 return PTR_ERR(f6i); 3372 3373 /* ifp->rt can be accessed outside of rtnl */ 3374 spin_lock(&ifp->lock); 3375 prev = ifp->rt; 3376 ifp->rt = f6i; 3377 spin_unlock(&ifp->lock); 3378 3379 fib6_info_release(prev); 3380 } 3381 3382 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3383 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3384 ifp->rt_priority, idev->dev, 0, 0, 3385 GFP_ATOMIC); 3386 } 3387 3388 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3389 addrconf_dad_start(ifp); 3390 3391 return 0; 3392 } 3393 3394 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3395 { 3396 struct inet6_ifaddr *ifp, *tmp; 3397 struct inet6_dev *idev; 3398 3399 idev = __in6_dev_get(dev); 3400 if (!idev) 3401 return; 3402 3403 write_lock_bh(&idev->lock); 3404 3405 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3406 if ((ifp->flags & IFA_F_PERMANENT) && 3407 fixup_permanent_addr(net, idev, ifp) < 0) { 3408 write_unlock_bh(&idev->lock); 3409 in6_ifa_hold(ifp); 3410 ipv6_del_addr(ifp); 3411 write_lock_bh(&idev->lock); 3412 3413 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3414 idev->dev->name, &ifp->addr); 3415 } 3416 } 3417 3418 write_unlock_bh(&idev->lock); 3419 } 3420 3421 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3422 void *ptr) 3423 { 3424 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3425 struct netdev_notifier_changeupper_info *info; 3426 struct inet6_dev *idev = __in6_dev_get(dev); 3427 struct net *net = dev_net(dev); 3428 int run_pending = 0; 3429 int err; 3430 3431 switch (event) { 3432 case NETDEV_REGISTER: 3433 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3434 idev = ipv6_add_dev(dev); 3435 if (IS_ERR(idev)) 3436 return notifier_from_errno(PTR_ERR(idev)); 3437 } 3438 break; 3439 3440 case NETDEV_CHANGEMTU: 3441 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3442 if (dev->mtu < IPV6_MIN_MTU) { 3443 addrconf_ifdown(dev, dev != net->loopback_dev); 3444 break; 3445 } 3446 3447 if (idev) { 3448 rt6_mtu_change(dev, dev->mtu); 3449 idev->cnf.mtu6 = dev->mtu; 3450 break; 3451 } 3452 3453 /* allocate new idev */ 3454 idev = ipv6_add_dev(dev); 3455 if (IS_ERR(idev)) 3456 break; 3457 3458 /* device is still not ready */ 3459 if (!(idev->if_flags & IF_READY)) 3460 break; 3461 3462 run_pending = 1; 3463 3464 /* fall through */ 3465 3466 case NETDEV_UP: 3467 case NETDEV_CHANGE: 3468 if (dev->flags & IFF_SLAVE) 3469 break; 3470 3471 if (idev && idev->cnf.disable_ipv6) 3472 break; 3473 3474 if (event == NETDEV_UP) { 3475 /* restore routes for permanent addresses */ 3476 addrconf_permanent_addr(net, dev); 3477 3478 if (!addrconf_link_ready(dev)) { 3479 /* device is not ready yet. */ 3480 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3481 dev->name); 3482 break; 3483 } 3484 3485 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3486 idev = ipv6_add_dev(dev); 3487 3488 if (!IS_ERR_OR_NULL(idev)) { 3489 idev->if_flags |= IF_READY; 3490 run_pending = 1; 3491 } 3492 } else if (event == NETDEV_CHANGE) { 3493 if (!addrconf_link_ready(dev)) { 3494 /* device is still not ready. */ 3495 rt6_sync_down_dev(dev, event); 3496 break; 3497 } 3498 3499 if (idev) { 3500 if (idev->if_flags & IF_READY) { 3501 /* device is already configured - 3502 * but resend MLD reports, we might 3503 * have roamed and need to update 3504 * multicast snooping switches 3505 */ 3506 ipv6_mc_up(idev); 3507 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3508 break; 3509 } 3510 idev->if_flags |= IF_READY; 3511 } 3512 3513 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3514 dev->name); 3515 3516 run_pending = 1; 3517 } 3518 3519 switch (dev->type) { 3520 #if IS_ENABLED(CONFIG_IPV6_SIT) 3521 case ARPHRD_SIT: 3522 addrconf_sit_config(dev); 3523 break; 3524 #endif 3525 #if IS_ENABLED(CONFIG_NET_IPGRE) 3526 case ARPHRD_IPGRE: 3527 addrconf_gre_config(dev); 3528 break; 3529 #endif 3530 case ARPHRD_LOOPBACK: 3531 init_loopback(dev); 3532 break; 3533 3534 default: 3535 addrconf_dev_config(dev); 3536 break; 3537 } 3538 3539 if (!IS_ERR_OR_NULL(idev)) { 3540 if (run_pending) 3541 addrconf_dad_run(idev); 3542 3543 /* Device has an address by now */ 3544 rt6_sync_up(dev, RTNH_F_DEAD); 3545 3546 /* 3547 * If the MTU changed during the interface down, 3548 * when the interface up, the changed MTU must be 3549 * reflected in the idev as well as routers. 3550 */ 3551 if (idev->cnf.mtu6 != dev->mtu && 3552 dev->mtu >= IPV6_MIN_MTU) { 3553 rt6_mtu_change(dev, dev->mtu); 3554 idev->cnf.mtu6 = dev->mtu; 3555 } 3556 idev->tstamp = jiffies; 3557 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3558 3559 /* 3560 * If the changed mtu during down is lower than 3561 * IPV6_MIN_MTU stop IPv6 on this interface. 3562 */ 3563 if (dev->mtu < IPV6_MIN_MTU) 3564 addrconf_ifdown(dev, dev != net->loopback_dev); 3565 } 3566 break; 3567 3568 case NETDEV_DOWN: 3569 case NETDEV_UNREGISTER: 3570 /* 3571 * Remove all addresses from this interface. 3572 */ 3573 addrconf_ifdown(dev, event != NETDEV_DOWN); 3574 break; 3575 3576 case NETDEV_CHANGENAME: 3577 if (idev) { 3578 snmp6_unregister_dev(idev); 3579 addrconf_sysctl_unregister(idev); 3580 err = addrconf_sysctl_register(idev); 3581 if (err) 3582 return notifier_from_errno(err); 3583 err = snmp6_register_dev(idev); 3584 if (err) { 3585 addrconf_sysctl_unregister(idev); 3586 return notifier_from_errno(err); 3587 } 3588 } 3589 break; 3590 3591 case NETDEV_PRE_TYPE_CHANGE: 3592 case NETDEV_POST_TYPE_CHANGE: 3593 if (idev) 3594 addrconf_type_change(dev, event); 3595 break; 3596 3597 case NETDEV_CHANGEUPPER: 3598 info = ptr; 3599 3600 /* flush all routes if dev is linked to or unlinked from 3601 * an L3 master device (e.g., VRF) 3602 */ 3603 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3604 addrconf_ifdown(dev, 0); 3605 } 3606 3607 return NOTIFY_OK; 3608 } 3609 3610 /* 3611 * addrconf module should be notified of a device going up 3612 */ 3613 static struct notifier_block ipv6_dev_notf = { 3614 .notifier_call = addrconf_notify, 3615 .priority = ADDRCONF_NOTIFY_PRIORITY, 3616 }; 3617 3618 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3619 { 3620 struct inet6_dev *idev; 3621 ASSERT_RTNL(); 3622 3623 idev = __in6_dev_get(dev); 3624 3625 if (event == NETDEV_POST_TYPE_CHANGE) 3626 ipv6_mc_remap(idev); 3627 else if (event == NETDEV_PRE_TYPE_CHANGE) 3628 ipv6_mc_unmap(idev); 3629 } 3630 3631 static bool addr_is_local(const struct in6_addr *addr) 3632 { 3633 return ipv6_addr_type(addr) & 3634 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3635 } 3636 3637 static int addrconf_ifdown(struct net_device *dev, int how) 3638 { 3639 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3640 struct net *net = dev_net(dev); 3641 struct inet6_dev *idev; 3642 struct inet6_ifaddr *ifa, *tmp; 3643 bool keep_addr = false; 3644 int state, i; 3645 3646 ASSERT_RTNL(); 3647 3648 rt6_disable_ip(dev, event); 3649 3650 idev = __in6_dev_get(dev); 3651 if (!idev) 3652 return -ENODEV; 3653 3654 /* 3655 * Step 1: remove reference to ipv6 device from parent device. 3656 * Do not dev_put! 3657 */ 3658 if (how) { 3659 idev->dead = 1; 3660 3661 /* protected by rtnl_lock */ 3662 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3663 3664 /* Step 1.5: remove snmp6 entry */ 3665 snmp6_unregister_dev(idev); 3666 3667 } 3668 3669 /* combine the user config with event to determine if permanent 3670 * addresses are to be removed from address hash table 3671 */ 3672 if (!how && !idev->cnf.disable_ipv6) { 3673 /* aggregate the system setting and interface setting */ 3674 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3675 3676 if (!_keep_addr) 3677 _keep_addr = idev->cnf.keep_addr_on_down; 3678 3679 keep_addr = (_keep_addr > 0); 3680 } 3681 3682 /* Step 2: clear hash table */ 3683 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3684 struct hlist_head *h = &inet6_addr_lst[i]; 3685 3686 spin_lock_bh(&addrconf_hash_lock); 3687 restart: 3688 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3689 if (ifa->idev == idev) { 3690 addrconf_del_dad_work(ifa); 3691 /* combined flag + permanent flag decide if 3692 * address is retained on a down event 3693 */ 3694 if (!keep_addr || 3695 !(ifa->flags & IFA_F_PERMANENT) || 3696 addr_is_local(&ifa->addr)) { 3697 hlist_del_init_rcu(&ifa->addr_lst); 3698 goto restart; 3699 } 3700 } 3701 } 3702 spin_unlock_bh(&addrconf_hash_lock); 3703 } 3704 3705 write_lock_bh(&idev->lock); 3706 3707 addrconf_del_rs_timer(idev); 3708 3709 /* Step 2: clear flags for stateless addrconf */ 3710 if (!how) 3711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3712 3713 /* Step 3: clear tempaddr list */ 3714 while (!list_empty(&idev->tempaddr_list)) { 3715 ifa = list_first_entry(&idev->tempaddr_list, 3716 struct inet6_ifaddr, tmp_list); 3717 list_del(&ifa->tmp_list); 3718 write_unlock_bh(&idev->lock); 3719 spin_lock_bh(&ifa->lock); 3720 3721 if (ifa->ifpub) { 3722 in6_ifa_put(ifa->ifpub); 3723 ifa->ifpub = NULL; 3724 } 3725 spin_unlock_bh(&ifa->lock); 3726 in6_ifa_put(ifa); 3727 write_lock_bh(&idev->lock); 3728 } 3729 3730 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3731 struct fib6_info *rt = NULL; 3732 bool keep; 3733 3734 addrconf_del_dad_work(ifa); 3735 3736 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3737 !addr_is_local(&ifa->addr); 3738 3739 write_unlock_bh(&idev->lock); 3740 spin_lock_bh(&ifa->lock); 3741 3742 if (keep) { 3743 /* set state to skip the notifier below */ 3744 state = INET6_IFADDR_STATE_DEAD; 3745 ifa->state = INET6_IFADDR_STATE_PREDAD; 3746 if (!(ifa->flags & IFA_F_NODAD)) 3747 ifa->flags |= IFA_F_TENTATIVE; 3748 3749 rt = ifa->rt; 3750 ifa->rt = NULL; 3751 } else { 3752 state = ifa->state; 3753 ifa->state = INET6_IFADDR_STATE_DEAD; 3754 } 3755 3756 spin_unlock_bh(&ifa->lock); 3757 3758 if (rt) 3759 ip6_del_rt(net, rt); 3760 3761 if (state != INET6_IFADDR_STATE_DEAD) { 3762 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3763 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3764 } else { 3765 if (idev->cnf.forwarding) 3766 addrconf_leave_anycast(ifa); 3767 addrconf_leave_solict(ifa->idev, &ifa->addr); 3768 } 3769 3770 write_lock_bh(&idev->lock); 3771 if (!keep) { 3772 list_del_rcu(&ifa->if_list); 3773 in6_ifa_put(ifa); 3774 } 3775 } 3776 3777 write_unlock_bh(&idev->lock); 3778 3779 /* Step 5: Discard anycast and multicast list */ 3780 if (how) { 3781 ipv6_ac_destroy_dev(idev); 3782 ipv6_mc_destroy_dev(idev); 3783 } else { 3784 ipv6_mc_down(idev); 3785 } 3786 3787 idev->tstamp = jiffies; 3788 3789 /* Last: Shot the device (if unregistered) */ 3790 if (how) { 3791 addrconf_sysctl_unregister(idev); 3792 neigh_parms_release(&nd_tbl, idev->nd_parms); 3793 neigh_ifdown(&nd_tbl, dev); 3794 in6_dev_put(idev); 3795 } 3796 return 0; 3797 } 3798 3799 static void addrconf_rs_timer(struct timer_list *t) 3800 { 3801 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3802 struct net_device *dev = idev->dev; 3803 struct in6_addr lladdr; 3804 3805 write_lock(&idev->lock); 3806 if (idev->dead || !(idev->if_flags & IF_READY)) 3807 goto out; 3808 3809 if (!ipv6_accept_ra(idev)) 3810 goto out; 3811 3812 /* Announcement received after solicitation was sent */ 3813 if (idev->if_flags & IF_RA_RCVD) 3814 goto out; 3815 3816 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3817 write_unlock(&idev->lock); 3818 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3819 ndisc_send_rs(dev, &lladdr, 3820 &in6addr_linklocal_allrouters); 3821 else 3822 goto put; 3823 3824 write_lock(&idev->lock); 3825 idev->rs_interval = rfc3315_s14_backoff_update( 3826 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3827 /* The wait after the last probe can be shorter */ 3828 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3829 idev->cnf.rtr_solicits) ? 3830 idev->cnf.rtr_solicit_delay : 3831 idev->rs_interval); 3832 } else { 3833 /* 3834 * Note: we do not support deprecated "all on-link" 3835 * assumption any longer. 3836 */ 3837 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3838 } 3839 3840 out: 3841 write_unlock(&idev->lock); 3842 put: 3843 in6_dev_put(idev); 3844 } 3845 3846 /* 3847 * Duplicate Address Detection 3848 */ 3849 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3850 { 3851 unsigned long rand_num; 3852 struct inet6_dev *idev = ifp->idev; 3853 u64 nonce; 3854 3855 if (ifp->flags & IFA_F_OPTIMISTIC) 3856 rand_num = 0; 3857 else 3858 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3859 3860 nonce = 0; 3861 if (idev->cnf.enhanced_dad || 3862 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3863 do 3864 get_random_bytes(&nonce, 6); 3865 while (nonce == 0); 3866 } 3867 ifp->dad_nonce = nonce; 3868 ifp->dad_probes = idev->cnf.dad_transmits; 3869 addrconf_mod_dad_work(ifp, rand_num); 3870 } 3871 3872 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3873 { 3874 struct inet6_dev *idev = ifp->idev; 3875 struct net_device *dev = idev->dev; 3876 bool bump_id, notify = false; 3877 struct net *net; 3878 3879 addrconf_join_solict(dev, &ifp->addr); 3880 3881 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3882 3883 read_lock_bh(&idev->lock); 3884 spin_lock(&ifp->lock); 3885 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3886 goto out; 3887 3888 net = dev_net(dev); 3889 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3890 (net->ipv6.devconf_all->accept_dad < 1 && 3891 idev->cnf.accept_dad < 1) || 3892 !(ifp->flags&IFA_F_TENTATIVE) || 3893 ifp->flags & IFA_F_NODAD) { 3894 bool send_na = false; 3895 3896 if (ifp->flags & IFA_F_TENTATIVE && 3897 !(ifp->flags & IFA_F_OPTIMISTIC)) 3898 send_na = true; 3899 bump_id = ifp->flags & IFA_F_TENTATIVE; 3900 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3901 spin_unlock(&ifp->lock); 3902 read_unlock_bh(&idev->lock); 3903 3904 addrconf_dad_completed(ifp, bump_id, send_na); 3905 return; 3906 } 3907 3908 if (!(idev->if_flags & IF_READY)) { 3909 spin_unlock(&ifp->lock); 3910 read_unlock_bh(&idev->lock); 3911 /* 3912 * If the device is not ready: 3913 * - keep it tentative if it is a permanent address. 3914 * - otherwise, kill it. 3915 */ 3916 in6_ifa_hold(ifp); 3917 addrconf_dad_stop(ifp, 0); 3918 return; 3919 } 3920 3921 /* 3922 * Optimistic nodes can start receiving 3923 * Frames right away 3924 */ 3925 if (ifp->flags & IFA_F_OPTIMISTIC) { 3926 ip6_ins_rt(net, ifp->rt); 3927 if (ipv6_use_optimistic_addr(net, idev)) { 3928 /* Because optimistic nodes can use this address, 3929 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3930 */ 3931 notify = true; 3932 } 3933 } 3934 3935 addrconf_dad_kick(ifp); 3936 out: 3937 spin_unlock(&ifp->lock); 3938 read_unlock_bh(&idev->lock); 3939 if (notify) 3940 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3941 } 3942 3943 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3944 { 3945 bool begin_dad = false; 3946 3947 spin_lock_bh(&ifp->lock); 3948 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3949 ifp->state = INET6_IFADDR_STATE_PREDAD; 3950 begin_dad = true; 3951 } 3952 spin_unlock_bh(&ifp->lock); 3953 3954 if (begin_dad) 3955 addrconf_mod_dad_work(ifp, 0); 3956 } 3957 3958 static void addrconf_dad_work(struct work_struct *w) 3959 { 3960 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3961 struct inet6_ifaddr, 3962 dad_work); 3963 struct inet6_dev *idev = ifp->idev; 3964 bool bump_id, disable_ipv6 = false; 3965 struct in6_addr mcaddr; 3966 3967 enum { 3968 DAD_PROCESS, 3969 DAD_BEGIN, 3970 DAD_ABORT, 3971 } action = DAD_PROCESS; 3972 3973 rtnl_lock(); 3974 3975 spin_lock_bh(&ifp->lock); 3976 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3977 action = DAD_BEGIN; 3978 ifp->state = INET6_IFADDR_STATE_DAD; 3979 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3980 action = DAD_ABORT; 3981 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3982 3983 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3984 idev->cnf.accept_dad > 1) && 3985 !idev->cnf.disable_ipv6 && 3986 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3987 struct in6_addr addr; 3988 3989 addr.s6_addr32[0] = htonl(0xfe800000); 3990 addr.s6_addr32[1] = 0; 3991 3992 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3993 ipv6_addr_equal(&ifp->addr, &addr)) { 3994 /* DAD failed for link-local based on MAC */ 3995 idev->cnf.disable_ipv6 = 1; 3996 3997 pr_info("%s: IPv6 being disabled!\n", 3998 ifp->idev->dev->name); 3999 disable_ipv6 = true; 4000 } 4001 } 4002 } 4003 spin_unlock_bh(&ifp->lock); 4004 4005 if (action == DAD_BEGIN) { 4006 addrconf_dad_begin(ifp); 4007 goto out; 4008 } else if (action == DAD_ABORT) { 4009 in6_ifa_hold(ifp); 4010 addrconf_dad_stop(ifp, 1); 4011 if (disable_ipv6) 4012 addrconf_ifdown(idev->dev, 0); 4013 goto out; 4014 } 4015 4016 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4017 goto out; 4018 4019 write_lock_bh(&idev->lock); 4020 if (idev->dead || !(idev->if_flags & IF_READY)) { 4021 write_unlock_bh(&idev->lock); 4022 goto out; 4023 } 4024 4025 spin_lock(&ifp->lock); 4026 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4027 spin_unlock(&ifp->lock); 4028 write_unlock_bh(&idev->lock); 4029 goto out; 4030 } 4031 4032 if (ifp->dad_probes == 0) { 4033 bool send_na = false; 4034 4035 /* 4036 * DAD was successful 4037 */ 4038 4039 if (ifp->flags & IFA_F_TENTATIVE && 4040 !(ifp->flags & IFA_F_OPTIMISTIC)) 4041 send_na = true; 4042 bump_id = ifp->flags & IFA_F_TENTATIVE; 4043 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4044 spin_unlock(&ifp->lock); 4045 write_unlock_bh(&idev->lock); 4046 4047 addrconf_dad_completed(ifp, bump_id, send_na); 4048 4049 goto out; 4050 } 4051 4052 ifp->dad_probes--; 4053 addrconf_mod_dad_work(ifp, 4054 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4055 spin_unlock(&ifp->lock); 4056 write_unlock_bh(&idev->lock); 4057 4058 /* send a neighbour solicitation for our addr */ 4059 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4060 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4061 ifp->dad_nonce); 4062 out: 4063 in6_ifa_put(ifp); 4064 rtnl_unlock(); 4065 } 4066 4067 /* ifp->idev must be at least read locked */ 4068 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4069 { 4070 struct inet6_ifaddr *ifpiter; 4071 struct inet6_dev *idev = ifp->idev; 4072 4073 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4074 if (ifpiter->scope > IFA_LINK) 4075 break; 4076 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4077 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4078 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4079 IFA_F_PERMANENT) 4080 return false; 4081 } 4082 return true; 4083 } 4084 4085 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4086 bool send_na) 4087 { 4088 struct net_device *dev = ifp->idev->dev; 4089 struct in6_addr lladdr; 4090 bool send_rs, send_mld; 4091 4092 addrconf_del_dad_work(ifp); 4093 4094 /* 4095 * Configure the address for reception. Now it is valid. 4096 */ 4097 4098 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4099 4100 /* If added prefix is link local and we are prepared to process 4101 router advertisements, start sending router solicitations. 4102 */ 4103 4104 read_lock_bh(&ifp->idev->lock); 4105 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4106 send_rs = send_mld && 4107 ipv6_accept_ra(ifp->idev) && 4108 ifp->idev->cnf.rtr_solicits != 0 && 4109 (dev->flags&IFF_LOOPBACK) == 0; 4110 read_unlock_bh(&ifp->idev->lock); 4111 4112 /* While dad is in progress mld report's source address is in6_addrany. 4113 * Resend with proper ll now. 4114 */ 4115 if (send_mld) 4116 ipv6_mc_dad_complete(ifp->idev); 4117 4118 /* send unsolicited NA if enabled */ 4119 if (send_na && 4120 (ifp->idev->cnf.ndisc_notify || 4121 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4122 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4123 /*router=*/ !!ifp->idev->cnf.forwarding, 4124 /*solicited=*/ false, /*override=*/ true, 4125 /*inc_opt=*/ true); 4126 } 4127 4128 if (send_rs) { 4129 /* 4130 * If a host as already performed a random delay 4131 * [...] as part of DAD [...] there is no need 4132 * to delay again before sending the first RS 4133 */ 4134 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4135 return; 4136 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4137 4138 write_lock_bh(&ifp->idev->lock); 4139 spin_lock(&ifp->lock); 4140 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4141 ifp->idev->cnf.rtr_solicit_interval); 4142 ifp->idev->rs_probes = 1; 4143 ifp->idev->if_flags |= IF_RS_SENT; 4144 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4145 spin_unlock(&ifp->lock); 4146 write_unlock_bh(&ifp->idev->lock); 4147 } 4148 4149 if (bump_id) 4150 rt_genid_bump_ipv6(dev_net(dev)); 4151 4152 /* Make sure that a new temporary address will be created 4153 * before this temporary address becomes deprecated. 4154 */ 4155 if (ifp->flags & IFA_F_TEMPORARY) 4156 addrconf_verify_rtnl(); 4157 } 4158 4159 static void addrconf_dad_run(struct inet6_dev *idev) 4160 { 4161 struct inet6_ifaddr *ifp; 4162 4163 read_lock_bh(&idev->lock); 4164 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4165 spin_lock(&ifp->lock); 4166 if (ifp->flags & IFA_F_TENTATIVE && 4167 ifp->state == INET6_IFADDR_STATE_DAD) 4168 addrconf_dad_kick(ifp); 4169 spin_unlock(&ifp->lock); 4170 } 4171 read_unlock_bh(&idev->lock); 4172 } 4173 4174 #ifdef CONFIG_PROC_FS 4175 struct if6_iter_state { 4176 struct seq_net_private p; 4177 int bucket; 4178 int offset; 4179 }; 4180 4181 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4182 { 4183 struct if6_iter_state *state = seq->private; 4184 struct net *net = seq_file_net(seq); 4185 struct inet6_ifaddr *ifa = NULL; 4186 int p = 0; 4187 4188 /* initial bucket if pos is 0 */ 4189 if (pos == 0) { 4190 state->bucket = 0; 4191 state->offset = 0; 4192 } 4193 4194 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4195 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4196 addr_lst) { 4197 if (!net_eq(dev_net(ifa->idev->dev), net)) 4198 continue; 4199 /* sync with offset */ 4200 if (p < state->offset) { 4201 p++; 4202 continue; 4203 } 4204 state->offset++; 4205 return ifa; 4206 } 4207 4208 /* prepare for next bucket */ 4209 state->offset = 0; 4210 p = 0; 4211 } 4212 return NULL; 4213 } 4214 4215 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4216 struct inet6_ifaddr *ifa) 4217 { 4218 struct if6_iter_state *state = seq->private; 4219 struct net *net = seq_file_net(seq); 4220 4221 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4222 if (!net_eq(dev_net(ifa->idev->dev), net)) 4223 continue; 4224 state->offset++; 4225 return ifa; 4226 } 4227 4228 while (++state->bucket < IN6_ADDR_HSIZE) { 4229 state->offset = 0; 4230 hlist_for_each_entry_rcu(ifa, 4231 &inet6_addr_lst[state->bucket], addr_lst) { 4232 if (!net_eq(dev_net(ifa->idev->dev), net)) 4233 continue; 4234 state->offset++; 4235 return ifa; 4236 } 4237 } 4238 4239 return NULL; 4240 } 4241 4242 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4243 __acquires(rcu) 4244 { 4245 rcu_read_lock(); 4246 return if6_get_first(seq, *pos); 4247 } 4248 4249 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4250 { 4251 struct inet6_ifaddr *ifa; 4252 4253 ifa = if6_get_next(seq, v); 4254 ++*pos; 4255 return ifa; 4256 } 4257 4258 static void if6_seq_stop(struct seq_file *seq, void *v) 4259 __releases(rcu) 4260 { 4261 rcu_read_unlock(); 4262 } 4263 4264 static int if6_seq_show(struct seq_file *seq, void *v) 4265 { 4266 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4267 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4268 &ifp->addr, 4269 ifp->idev->dev->ifindex, 4270 ifp->prefix_len, 4271 ifp->scope, 4272 (u8) ifp->flags, 4273 ifp->idev->dev->name); 4274 return 0; 4275 } 4276 4277 static const struct seq_operations if6_seq_ops = { 4278 .start = if6_seq_start, 4279 .next = if6_seq_next, 4280 .show = if6_seq_show, 4281 .stop = if6_seq_stop, 4282 }; 4283 4284 static int __net_init if6_proc_net_init(struct net *net) 4285 { 4286 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4287 sizeof(struct if6_iter_state))) 4288 return -ENOMEM; 4289 return 0; 4290 } 4291 4292 static void __net_exit if6_proc_net_exit(struct net *net) 4293 { 4294 remove_proc_entry("if_inet6", net->proc_net); 4295 } 4296 4297 static struct pernet_operations if6_proc_net_ops = { 4298 .init = if6_proc_net_init, 4299 .exit = if6_proc_net_exit, 4300 }; 4301 4302 int __init if6_proc_init(void) 4303 { 4304 return register_pernet_subsys(&if6_proc_net_ops); 4305 } 4306 4307 void if6_proc_exit(void) 4308 { 4309 unregister_pernet_subsys(&if6_proc_net_ops); 4310 } 4311 #endif /* CONFIG_PROC_FS */ 4312 4313 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4314 /* Check if address is a home address configured on any interface. */ 4315 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4316 { 4317 unsigned int hash = inet6_addr_hash(net, addr); 4318 struct inet6_ifaddr *ifp = NULL; 4319 int ret = 0; 4320 4321 rcu_read_lock(); 4322 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4323 if (!net_eq(dev_net(ifp->idev->dev), net)) 4324 continue; 4325 if (ipv6_addr_equal(&ifp->addr, addr) && 4326 (ifp->flags & IFA_F_HOMEADDRESS)) { 4327 ret = 1; 4328 break; 4329 } 4330 } 4331 rcu_read_unlock(); 4332 return ret; 4333 } 4334 #endif 4335 4336 /* 4337 * Periodic address status verification 4338 */ 4339 4340 static void addrconf_verify_rtnl(void) 4341 { 4342 unsigned long now, next, next_sec, next_sched; 4343 struct inet6_ifaddr *ifp; 4344 int i; 4345 4346 ASSERT_RTNL(); 4347 4348 rcu_read_lock_bh(); 4349 now = jiffies; 4350 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4351 4352 cancel_delayed_work(&addr_chk_work); 4353 4354 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4355 restart: 4356 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4357 unsigned long age; 4358 4359 /* When setting preferred_lft to a value not zero or 4360 * infinity, while valid_lft is infinity 4361 * IFA_F_PERMANENT has a non-infinity life time. 4362 */ 4363 if ((ifp->flags & IFA_F_PERMANENT) && 4364 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4365 continue; 4366 4367 spin_lock(&ifp->lock); 4368 /* We try to batch several events at once. */ 4369 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4370 4371 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4372 age >= ifp->valid_lft) { 4373 spin_unlock(&ifp->lock); 4374 in6_ifa_hold(ifp); 4375 ipv6_del_addr(ifp); 4376 goto restart; 4377 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4378 spin_unlock(&ifp->lock); 4379 continue; 4380 } else if (age >= ifp->prefered_lft) { 4381 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4382 int deprecate = 0; 4383 4384 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4385 deprecate = 1; 4386 ifp->flags |= IFA_F_DEPRECATED; 4387 } 4388 4389 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4390 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4391 next = ifp->tstamp + ifp->valid_lft * HZ; 4392 4393 spin_unlock(&ifp->lock); 4394 4395 if (deprecate) { 4396 in6_ifa_hold(ifp); 4397 4398 ipv6_ifa_notify(0, ifp); 4399 in6_ifa_put(ifp); 4400 goto restart; 4401 } 4402 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4403 !(ifp->flags&IFA_F_TENTATIVE)) { 4404 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4405 ifp->idev->cnf.dad_transmits * 4406 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4407 4408 if (age >= ifp->prefered_lft - regen_advance) { 4409 struct inet6_ifaddr *ifpub = ifp->ifpub; 4410 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4411 next = ifp->tstamp + ifp->prefered_lft * HZ; 4412 if (!ifp->regen_count && ifpub) { 4413 ifp->regen_count++; 4414 in6_ifa_hold(ifp); 4415 in6_ifa_hold(ifpub); 4416 spin_unlock(&ifp->lock); 4417 4418 spin_lock(&ifpub->lock); 4419 ifpub->regen_count = 0; 4420 spin_unlock(&ifpub->lock); 4421 rcu_read_unlock_bh(); 4422 ipv6_create_tempaddr(ifpub, ifp, true); 4423 in6_ifa_put(ifpub); 4424 in6_ifa_put(ifp); 4425 rcu_read_lock_bh(); 4426 goto restart; 4427 } 4428 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4429 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4430 spin_unlock(&ifp->lock); 4431 } else { 4432 /* ifp->prefered_lft <= ifp->valid_lft */ 4433 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4434 next = ifp->tstamp + ifp->prefered_lft * HZ; 4435 spin_unlock(&ifp->lock); 4436 } 4437 } 4438 } 4439 4440 next_sec = round_jiffies_up(next); 4441 next_sched = next; 4442 4443 /* If rounded timeout is accurate enough, accept it. */ 4444 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4445 next_sched = next_sec; 4446 4447 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4448 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4449 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4450 4451 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4452 now, next, next_sec, next_sched); 4453 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4454 rcu_read_unlock_bh(); 4455 } 4456 4457 static void addrconf_verify_work(struct work_struct *w) 4458 { 4459 rtnl_lock(); 4460 addrconf_verify_rtnl(); 4461 rtnl_unlock(); 4462 } 4463 4464 static void addrconf_verify(void) 4465 { 4466 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4467 } 4468 4469 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4470 struct in6_addr **peer_pfx) 4471 { 4472 struct in6_addr *pfx = NULL; 4473 4474 *peer_pfx = NULL; 4475 4476 if (addr) 4477 pfx = nla_data(addr); 4478 4479 if (local) { 4480 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4481 *peer_pfx = pfx; 4482 pfx = nla_data(local); 4483 } 4484 4485 return pfx; 4486 } 4487 4488 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4489 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4490 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4491 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4492 [IFA_FLAGS] = { .len = sizeof(u32) }, 4493 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4494 }; 4495 4496 static int 4497 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4498 struct netlink_ext_ack *extack) 4499 { 4500 struct net *net = sock_net(skb->sk); 4501 struct ifaddrmsg *ifm; 4502 struct nlattr *tb[IFA_MAX+1]; 4503 struct in6_addr *pfx, *peer_pfx; 4504 u32 ifa_flags; 4505 int err; 4506 4507 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4508 extack); 4509 if (err < 0) 4510 return err; 4511 4512 ifm = nlmsg_data(nlh); 4513 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4514 if (!pfx) 4515 return -EINVAL; 4516 4517 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4518 4519 /* We ignore other flags so far. */ 4520 ifa_flags &= IFA_F_MANAGETEMPADDR; 4521 4522 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4523 ifm->ifa_prefixlen); 4524 } 4525 4526 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4527 unsigned long expires, u32 flags) 4528 { 4529 struct fib6_info *f6i; 4530 u32 prio; 4531 4532 f6i = addrconf_get_prefix_route(&ifp->addr, 4533 ifp->prefix_len, 4534 ifp->idev->dev, 4535 0, RTF_GATEWAY | RTF_DEFAULT); 4536 if (!f6i) 4537 return -ENOENT; 4538 4539 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4540 if (f6i->fib6_metric != prio) { 4541 /* delete old one */ 4542 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 4543 4544 /* add new one */ 4545 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4546 ifp->rt_priority, ifp->idev->dev, 4547 expires, flags, GFP_KERNEL); 4548 } else { 4549 if (!expires) 4550 fib6_clean_expires(f6i); 4551 else 4552 fib6_set_expires(f6i, expires); 4553 4554 fib6_info_release(f6i); 4555 } 4556 4557 return 0; 4558 } 4559 4560 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4561 { 4562 u32 flags; 4563 clock_t expires; 4564 unsigned long timeout; 4565 bool was_managetempaddr; 4566 bool had_prefixroute; 4567 4568 ASSERT_RTNL(); 4569 4570 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4571 return -EINVAL; 4572 4573 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4574 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4575 return -EINVAL; 4576 4577 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4578 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4579 4580 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4581 if (addrconf_finite_timeout(timeout)) { 4582 expires = jiffies_to_clock_t(timeout * HZ); 4583 cfg->valid_lft = timeout; 4584 flags = RTF_EXPIRES; 4585 } else { 4586 expires = 0; 4587 flags = 0; 4588 cfg->ifa_flags |= IFA_F_PERMANENT; 4589 } 4590 4591 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4592 if (addrconf_finite_timeout(timeout)) { 4593 if (timeout == 0) 4594 cfg->ifa_flags |= IFA_F_DEPRECATED; 4595 cfg->preferred_lft = timeout; 4596 } 4597 4598 spin_lock_bh(&ifp->lock); 4599 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4600 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4601 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4602 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4603 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4604 IFA_F_NOPREFIXROUTE); 4605 ifp->flags |= cfg->ifa_flags; 4606 ifp->tstamp = jiffies; 4607 ifp->valid_lft = cfg->valid_lft; 4608 ifp->prefered_lft = cfg->preferred_lft; 4609 4610 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4611 ifp->rt_priority = cfg->rt_priority; 4612 4613 spin_unlock_bh(&ifp->lock); 4614 if (!(ifp->flags&IFA_F_TENTATIVE)) 4615 ipv6_ifa_notify(0, ifp); 4616 4617 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4618 int rc = -ENOENT; 4619 4620 if (had_prefixroute) 4621 rc = modify_prefix_route(ifp, expires, flags); 4622 4623 /* prefix route could have been deleted; if so restore it */ 4624 if (rc == -ENOENT) { 4625 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4626 ifp->rt_priority, ifp->idev->dev, 4627 expires, flags, GFP_KERNEL); 4628 } 4629 } else if (had_prefixroute) { 4630 enum cleanup_prefix_rt_t action; 4631 unsigned long rt_expires; 4632 4633 write_lock_bh(&ifp->idev->lock); 4634 action = check_cleanup_prefix_route(ifp, &rt_expires); 4635 write_unlock_bh(&ifp->idev->lock); 4636 4637 if (action != CLEANUP_PREFIX_RT_NOP) { 4638 cleanup_prefix_route(ifp, rt_expires, 4639 action == CLEANUP_PREFIX_RT_DEL); 4640 } 4641 } 4642 4643 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4644 if (was_managetempaddr && 4645 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4646 cfg->valid_lft = 0; 4647 cfg->preferred_lft = 0; 4648 } 4649 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4650 cfg->preferred_lft, !was_managetempaddr, 4651 jiffies); 4652 } 4653 4654 addrconf_verify_rtnl(); 4655 4656 return 0; 4657 } 4658 4659 static int 4660 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4661 struct netlink_ext_ack *extack) 4662 { 4663 struct net *net = sock_net(skb->sk); 4664 struct ifaddrmsg *ifm; 4665 struct nlattr *tb[IFA_MAX+1]; 4666 struct in6_addr *peer_pfx; 4667 struct inet6_ifaddr *ifa; 4668 struct net_device *dev; 4669 struct inet6_dev *idev; 4670 struct ifa6_config cfg; 4671 int err; 4672 4673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4674 extack); 4675 if (err < 0) 4676 return err; 4677 4678 memset(&cfg, 0, sizeof(cfg)); 4679 4680 ifm = nlmsg_data(nlh); 4681 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4682 if (!cfg.pfx) 4683 return -EINVAL; 4684 4685 cfg.peer_pfx = peer_pfx; 4686 cfg.plen = ifm->ifa_prefixlen; 4687 if (tb[IFA_RT_PRIORITY]) 4688 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4689 4690 cfg.valid_lft = INFINITY_LIFE_TIME; 4691 cfg.preferred_lft = INFINITY_LIFE_TIME; 4692 4693 if (tb[IFA_CACHEINFO]) { 4694 struct ifa_cacheinfo *ci; 4695 4696 ci = nla_data(tb[IFA_CACHEINFO]); 4697 cfg.valid_lft = ci->ifa_valid; 4698 cfg.preferred_lft = ci->ifa_prefered; 4699 } 4700 4701 dev = __dev_get_by_index(net, ifm->ifa_index); 4702 if (!dev) 4703 return -ENODEV; 4704 4705 if (tb[IFA_FLAGS]) 4706 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4707 else 4708 cfg.ifa_flags = ifm->ifa_flags; 4709 4710 /* We ignore other flags so far. */ 4711 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4712 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4713 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4714 4715 idev = ipv6_find_idev(dev); 4716 if (IS_ERR(idev)) 4717 return PTR_ERR(idev); 4718 4719 if (!ipv6_allow_optimistic_dad(net, idev)) 4720 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4721 4722 if (cfg.ifa_flags & IFA_F_NODAD && 4723 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4724 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4725 return -EINVAL; 4726 } 4727 4728 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4729 if (!ifa) { 4730 /* 4731 * It would be best to check for !NLM_F_CREATE here but 4732 * userspace already relies on not having to provide this. 4733 */ 4734 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4735 } 4736 4737 if (nlh->nlmsg_flags & NLM_F_EXCL || 4738 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4739 err = -EEXIST; 4740 else 4741 err = inet6_addr_modify(ifa, &cfg); 4742 4743 in6_ifa_put(ifa); 4744 4745 return err; 4746 } 4747 4748 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4749 u8 scope, int ifindex) 4750 { 4751 struct ifaddrmsg *ifm; 4752 4753 ifm = nlmsg_data(nlh); 4754 ifm->ifa_family = AF_INET6; 4755 ifm->ifa_prefixlen = prefixlen; 4756 ifm->ifa_flags = flags; 4757 ifm->ifa_scope = scope; 4758 ifm->ifa_index = ifindex; 4759 } 4760 4761 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4762 unsigned long tstamp, u32 preferred, u32 valid) 4763 { 4764 struct ifa_cacheinfo ci; 4765 4766 ci.cstamp = cstamp_delta(cstamp); 4767 ci.tstamp = cstamp_delta(tstamp); 4768 ci.ifa_prefered = preferred; 4769 ci.ifa_valid = valid; 4770 4771 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4772 } 4773 4774 static inline int rt_scope(int ifa_scope) 4775 { 4776 if (ifa_scope & IFA_HOST) 4777 return RT_SCOPE_HOST; 4778 else if (ifa_scope & IFA_LINK) 4779 return RT_SCOPE_LINK; 4780 else if (ifa_scope & IFA_SITE) 4781 return RT_SCOPE_SITE; 4782 else 4783 return RT_SCOPE_UNIVERSE; 4784 } 4785 4786 static inline int inet6_ifaddr_msgsize(void) 4787 { 4788 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4789 + nla_total_size(16) /* IFA_LOCAL */ 4790 + nla_total_size(16) /* IFA_ADDRESS */ 4791 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4792 + nla_total_size(4) /* IFA_FLAGS */ 4793 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4794 } 4795 4796 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4797 u32 portid, u32 seq, int event, unsigned int flags) 4798 { 4799 struct nlmsghdr *nlh; 4800 u32 preferred, valid; 4801 4802 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4803 if (!nlh) 4804 return -EMSGSIZE; 4805 4806 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4807 ifa->idev->dev->ifindex); 4808 4809 if (!((ifa->flags&IFA_F_PERMANENT) && 4810 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4811 preferred = ifa->prefered_lft; 4812 valid = ifa->valid_lft; 4813 if (preferred != INFINITY_LIFE_TIME) { 4814 long tval = (jiffies - ifa->tstamp)/HZ; 4815 if (preferred > tval) 4816 preferred -= tval; 4817 else 4818 preferred = 0; 4819 if (valid != INFINITY_LIFE_TIME) { 4820 if (valid > tval) 4821 valid -= tval; 4822 else 4823 valid = 0; 4824 } 4825 } 4826 } else { 4827 preferred = INFINITY_LIFE_TIME; 4828 valid = INFINITY_LIFE_TIME; 4829 } 4830 4831 if (!ipv6_addr_any(&ifa->peer_addr)) { 4832 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4833 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4834 goto error; 4835 } else 4836 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4837 goto error; 4838 4839 if (ifa->rt_priority && 4840 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4841 goto error; 4842 4843 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4844 goto error; 4845 4846 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4847 goto error; 4848 4849 nlmsg_end(skb, nlh); 4850 return 0; 4851 4852 error: 4853 nlmsg_cancel(skb, nlh); 4854 return -EMSGSIZE; 4855 } 4856 4857 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4858 u32 portid, u32 seq, int event, u16 flags) 4859 { 4860 struct nlmsghdr *nlh; 4861 u8 scope = RT_SCOPE_UNIVERSE; 4862 int ifindex = ifmca->idev->dev->ifindex; 4863 4864 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4865 scope = RT_SCOPE_SITE; 4866 4867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4868 if (!nlh) 4869 return -EMSGSIZE; 4870 4871 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4872 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4873 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4875 nlmsg_cancel(skb, nlh); 4876 return -EMSGSIZE; 4877 } 4878 4879 nlmsg_end(skb, nlh); 4880 return 0; 4881 } 4882 4883 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4884 u32 portid, u32 seq, int event, unsigned int flags) 4885 { 4886 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4887 int ifindex = dev ? dev->ifindex : 1; 4888 struct nlmsghdr *nlh; 4889 u8 scope = RT_SCOPE_UNIVERSE; 4890 4891 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4892 scope = RT_SCOPE_SITE; 4893 4894 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4895 if (!nlh) 4896 return -EMSGSIZE; 4897 4898 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4899 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4900 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4901 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4902 nlmsg_cancel(skb, nlh); 4903 return -EMSGSIZE; 4904 } 4905 4906 nlmsg_end(skb, nlh); 4907 return 0; 4908 } 4909 4910 enum addr_type_t { 4911 UNICAST_ADDR, 4912 MULTICAST_ADDR, 4913 ANYCAST_ADDR, 4914 }; 4915 4916 /* called with rcu_read_lock() */ 4917 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4918 struct netlink_callback *cb, enum addr_type_t type, 4919 int s_ip_idx, int *p_ip_idx) 4920 { 4921 struct ifmcaddr6 *ifmca; 4922 struct ifacaddr6 *ifaca; 4923 int err = 1; 4924 int ip_idx = *p_ip_idx; 4925 4926 read_lock_bh(&idev->lock); 4927 switch (type) { 4928 case UNICAST_ADDR: { 4929 struct inet6_ifaddr *ifa; 4930 4931 /* unicast address incl. temp addr */ 4932 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4933 if (++ip_idx < s_ip_idx) 4934 continue; 4935 err = inet6_fill_ifaddr(skb, ifa, 4936 NETLINK_CB(cb->skb).portid, 4937 cb->nlh->nlmsg_seq, 4938 RTM_NEWADDR, 4939 NLM_F_MULTI); 4940 if (err < 0) 4941 break; 4942 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4943 } 4944 break; 4945 } 4946 case MULTICAST_ADDR: 4947 /* multicast address */ 4948 for (ifmca = idev->mc_list; ifmca; 4949 ifmca = ifmca->next, ip_idx++) { 4950 if (ip_idx < s_ip_idx) 4951 continue; 4952 err = inet6_fill_ifmcaddr(skb, ifmca, 4953 NETLINK_CB(cb->skb).portid, 4954 cb->nlh->nlmsg_seq, 4955 RTM_GETMULTICAST, 4956 NLM_F_MULTI); 4957 if (err < 0) 4958 break; 4959 } 4960 break; 4961 case ANYCAST_ADDR: 4962 /* anycast address */ 4963 for (ifaca = idev->ac_list; ifaca; 4964 ifaca = ifaca->aca_next, ip_idx++) { 4965 if (ip_idx < s_ip_idx) 4966 continue; 4967 err = inet6_fill_ifacaddr(skb, ifaca, 4968 NETLINK_CB(cb->skb).portid, 4969 cb->nlh->nlmsg_seq, 4970 RTM_GETANYCAST, 4971 NLM_F_MULTI); 4972 if (err < 0) 4973 break; 4974 } 4975 break; 4976 default: 4977 break; 4978 } 4979 read_unlock_bh(&idev->lock); 4980 *p_ip_idx = ip_idx; 4981 return err; 4982 } 4983 4984 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4985 enum addr_type_t type) 4986 { 4987 struct net *net = sock_net(skb->sk); 4988 int h, s_h; 4989 int idx, ip_idx; 4990 int s_idx, s_ip_idx; 4991 struct net_device *dev; 4992 struct inet6_dev *idev; 4993 struct hlist_head *head; 4994 4995 s_h = cb->args[0]; 4996 s_idx = idx = cb->args[1]; 4997 s_ip_idx = ip_idx = cb->args[2]; 4998 4999 rcu_read_lock(); 5000 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 5001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5002 idx = 0; 5003 head = &net->dev_index_head[h]; 5004 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5005 if (idx < s_idx) 5006 goto cont; 5007 if (h > s_h || idx > s_idx) 5008 s_ip_idx = 0; 5009 ip_idx = 0; 5010 idev = __in6_dev_get(dev); 5011 if (!idev) 5012 goto cont; 5013 5014 if (in6_dump_addrs(idev, skb, cb, type, 5015 s_ip_idx, &ip_idx) < 0) 5016 goto done; 5017 cont: 5018 idx++; 5019 } 5020 } 5021 done: 5022 rcu_read_unlock(); 5023 cb->args[0] = h; 5024 cb->args[1] = idx; 5025 cb->args[2] = ip_idx; 5026 5027 return skb->len; 5028 } 5029 5030 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5031 { 5032 enum addr_type_t type = UNICAST_ADDR; 5033 5034 return inet6_dump_addr(skb, cb, type); 5035 } 5036 5037 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5038 { 5039 enum addr_type_t type = MULTICAST_ADDR; 5040 5041 return inet6_dump_addr(skb, cb, type); 5042 } 5043 5044 5045 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5046 { 5047 enum addr_type_t type = ANYCAST_ADDR; 5048 5049 return inet6_dump_addr(skb, cb, type); 5050 } 5051 5052 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5053 struct netlink_ext_ack *extack) 5054 { 5055 struct net *net = sock_net(in_skb->sk); 5056 struct ifaddrmsg *ifm; 5057 struct nlattr *tb[IFA_MAX+1]; 5058 struct in6_addr *addr = NULL, *peer; 5059 struct net_device *dev = NULL; 5060 struct inet6_ifaddr *ifa; 5061 struct sk_buff *skb; 5062 int err; 5063 5064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5065 extack); 5066 if (err < 0) 5067 return err; 5068 5069 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5070 if (!addr) 5071 return -EINVAL; 5072 5073 ifm = nlmsg_data(nlh); 5074 if (ifm->ifa_index) 5075 dev = dev_get_by_index(net, ifm->ifa_index); 5076 5077 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5078 if (!ifa) { 5079 err = -EADDRNOTAVAIL; 5080 goto errout; 5081 } 5082 5083 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5084 if (!skb) { 5085 err = -ENOBUFS; 5086 goto errout_ifa; 5087 } 5088 5089 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5090 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5091 if (err < 0) { 5092 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5093 WARN_ON(err == -EMSGSIZE); 5094 kfree_skb(skb); 5095 goto errout_ifa; 5096 } 5097 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5098 errout_ifa: 5099 in6_ifa_put(ifa); 5100 errout: 5101 if (dev) 5102 dev_put(dev); 5103 return err; 5104 } 5105 5106 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5107 { 5108 struct sk_buff *skb; 5109 struct net *net = dev_net(ifa->idev->dev); 5110 int err = -ENOBUFS; 5111 5112 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5113 if (!skb) 5114 goto errout; 5115 5116 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5117 if (err < 0) { 5118 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5119 WARN_ON(err == -EMSGSIZE); 5120 kfree_skb(skb); 5121 goto errout; 5122 } 5123 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5124 return; 5125 errout: 5126 if (err < 0) 5127 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5128 } 5129 5130 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5131 __s32 *array, int bytes) 5132 { 5133 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5134 5135 memset(array, 0, bytes); 5136 array[DEVCONF_FORWARDING] = cnf->forwarding; 5137 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5138 array[DEVCONF_MTU6] = cnf->mtu6; 5139 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5140 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5141 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5142 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5143 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5144 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5145 jiffies_to_msecs(cnf->rtr_solicit_interval); 5146 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5147 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5148 array[DEVCONF_RTR_SOLICIT_DELAY] = 5149 jiffies_to_msecs(cnf->rtr_solicit_delay); 5150 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5151 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5152 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5153 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5154 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5155 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5156 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5157 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5158 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5159 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5162 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5163 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5164 #ifdef CONFIG_IPV6_ROUTER_PREF 5165 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5166 array[DEVCONF_RTR_PROBE_INTERVAL] = 5167 jiffies_to_msecs(cnf->rtr_probe_interval); 5168 #ifdef CONFIG_IPV6_ROUTE_INFO 5169 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5171 #endif 5172 #endif 5173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5177 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5178 #endif 5179 #ifdef CONFIG_IPV6_MROUTE 5180 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5181 #endif 5182 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5183 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5184 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5185 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5186 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5187 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5188 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5189 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5190 /* we omit DEVCONF_STABLE_SECRET for now */ 5191 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5192 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5193 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5194 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5195 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5196 #ifdef CONFIG_IPV6_SEG6_HMAC 5197 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5198 #endif 5199 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5200 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5201 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5202 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5203 } 5204 5205 static inline size_t inet6_ifla6_size(void) 5206 { 5207 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5208 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5209 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5210 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5211 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5212 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5213 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5214 + 0; 5215 } 5216 5217 static inline size_t inet6_if_nlmsg_size(void) 5218 { 5219 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5220 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5221 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5222 + nla_total_size(4) /* IFLA_MTU */ 5223 + nla_total_size(4) /* IFLA_LINK */ 5224 + nla_total_size(1) /* IFLA_OPERSTATE */ 5225 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5226 } 5227 5228 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5229 int bytes) 5230 { 5231 int i; 5232 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5233 BUG_ON(pad < 0); 5234 5235 /* Use put_unaligned() because stats may not be aligned for u64. */ 5236 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5237 for (i = 1; i < ICMP6_MIB_MAX; i++) 5238 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5239 5240 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5241 } 5242 5243 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5244 int bytes, size_t syncpoff) 5245 { 5246 int i, c; 5247 u64 buff[IPSTATS_MIB_MAX]; 5248 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5249 5250 BUG_ON(pad < 0); 5251 5252 memset(buff, 0, sizeof(buff)); 5253 buff[0] = IPSTATS_MIB_MAX; 5254 5255 for_each_possible_cpu(c) { 5256 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5257 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5258 } 5259 5260 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5261 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5262 } 5263 5264 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5265 int bytes) 5266 { 5267 switch (attrtype) { 5268 case IFLA_INET6_STATS: 5269 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5270 offsetof(struct ipstats_mib, syncp)); 5271 break; 5272 case IFLA_INET6_ICMP6STATS: 5273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5274 break; 5275 } 5276 } 5277 5278 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5279 u32 ext_filter_mask) 5280 { 5281 struct nlattr *nla; 5282 struct ifla_cacheinfo ci; 5283 5284 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5285 goto nla_put_failure; 5286 ci.max_reasm_len = IPV6_MAXPLEN; 5287 ci.tstamp = cstamp_delta(idev->tstamp); 5288 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5289 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5290 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5291 goto nla_put_failure; 5292 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5293 if (!nla) 5294 goto nla_put_failure; 5295 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5296 5297 /* XXX - MC not implemented */ 5298 5299 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5300 return 0; 5301 5302 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5303 if (!nla) 5304 goto nla_put_failure; 5305 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5306 5307 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5308 if (!nla) 5309 goto nla_put_failure; 5310 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5311 5312 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5313 if (!nla) 5314 goto nla_put_failure; 5315 5316 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5317 goto nla_put_failure; 5318 5319 read_lock_bh(&idev->lock); 5320 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5321 read_unlock_bh(&idev->lock); 5322 5323 return 0; 5324 5325 nla_put_failure: 5326 return -EMSGSIZE; 5327 } 5328 5329 static size_t inet6_get_link_af_size(const struct net_device *dev, 5330 u32 ext_filter_mask) 5331 { 5332 if (!__in6_dev_get(dev)) 5333 return 0; 5334 5335 return inet6_ifla6_size(); 5336 } 5337 5338 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5339 u32 ext_filter_mask) 5340 { 5341 struct inet6_dev *idev = __in6_dev_get(dev); 5342 5343 if (!idev) 5344 return -ENODATA; 5345 5346 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5347 return -EMSGSIZE; 5348 5349 return 0; 5350 } 5351 5352 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5353 { 5354 struct inet6_ifaddr *ifp; 5355 struct net_device *dev = idev->dev; 5356 bool clear_token, update_rs = false; 5357 struct in6_addr ll_addr; 5358 5359 ASSERT_RTNL(); 5360 5361 if (!token) 5362 return -EINVAL; 5363 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5364 return -EINVAL; 5365 if (!ipv6_accept_ra(idev)) 5366 return -EINVAL; 5367 if (idev->cnf.rtr_solicits == 0) 5368 return -EINVAL; 5369 5370 write_lock_bh(&idev->lock); 5371 5372 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5373 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5374 5375 write_unlock_bh(&idev->lock); 5376 5377 clear_token = ipv6_addr_any(token); 5378 if (clear_token) 5379 goto update_lft; 5380 5381 if (!idev->dead && (idev->if_flags & IF_READY) && 5382 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5383 IFA_F_OPTIMISTIC)) { 5384 /* If we're not ready, then normal ifup will take care 5385 * of this. Otherwise, we need to request our rs here. 5386 */ 5387 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5388 update_rs = true; 5389 } 5390 5391 update_lft: 5392 write_lock_bh(&idev->lock); 5393 5394 if (update_rs) { 5395 idev->if_flags |= IF_RS_SENT; 5396 idev->rs_interval = rfc3315_s14_backoff_init( 5397 idev->cnf.rtr_solicit_interval); 5398 idev->rs_probes = 1; 5399 addrconf_mod_rs_timer(idev, idev->rs_interval); 5400 } 5401 5402 /* Well, that's kinda nasty ... */ 5403 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5404 spin_lock(&ifp->lock); 5405 if (ifp->tokenized) { 5406 ifp->valid_lft = 0; 5407 ifp->prefered_lft = 0; 5408 } 5409 spin_unlock(&ifp->lock); 5410 } 5411 5412 write_unlock_bh(&idev->lock); 5413 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5414 addrconf_verify_rtnl(); 5415 return 0; 5416 } 5417 5418 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5419 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5420 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5421 }; 5422 5423 static int inet6_validate_link_af(const struct net_device *dev, 5424 const struct nlattr *nla) 5425 { 5426 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5427 5428 if (dev && !__in6_dev_get(dev)) 5429 return -EAFNOSUPPORT; 5430 5431 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5432 NULL); 5433 } 5434 5435 static int check_addr_gen_mode(int mode) 5436 { 5437 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5438 mode != IN6_ADDR_GEN_MODE_NONE && 5439 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5440 mode != IN6_ADDR_GEN_MODE_RANDOM) 5441 return -EINVAL; 5442 return 1; 5443 } 5444 5445 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5446 int mode) 5447 { 5448 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5449 !idev->cnf.stable_secret.initialized && 5450 !net->ipv6.devconf_dflt->stable_secret.initialized) 5451 return -EINVAL; 5452 return 1; 5453 } 5454 5455 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5456 { 5457 int err = -EINVAL; 5458 struct inet6_dev *idev = __in6_dev_get(dev); 5459 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5460 5461 if (!idev) 5462 return -EAFNOSUPPORT; 5463 5464 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5465 BUG(); 5466 5467 if (tb[IFLA_INET6_TOKEN]) { 5468 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5469 if (err) 5470 return err; 5471 } 5472 5473 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5474 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5475 5476 if (check_addr_gen_mode(mode) < 0 || 5477 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5478 return -EINVAL; 5479 5480 idev->cnf.addr_gen_mode = mode; 5481 err = 0; 5482 } 5483 5484 return err; 5485 } 5486 5487 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5488 u32 portid, u32 seq, int event, unsigned int flags) 5489 { 5490 struct net_device *dev = idev->dev; 5491 struct ifinfomsg *hdr; 5492 struct nlmsghdr *nlh; 5493 void *protoinfo; 5494 5495 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5496 if (!nlh) 5497 return -EMSGSIZE; 5498 5499 hdr = nlmsg_data(nlh); 5500 hdr->ifi_family = AF_INET6; 5501 hdr->__ifi_pad = 0; 5502 hdr->ifi_type = dev->type; 5503 hdr->ifi_index = dev->ifindex; 5504 hdr->ifi_flags = dev_get_flags(dev); 5505 hdr->ifi_change = 0; 5506 5507 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5508 (dev->addr_len && 5509 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5510 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5511 (dev->ifindex != dev_get_iflink(dev) && 5512 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5513 nla_put_u8(skb, IFLA_OPERSTATE, 5514 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5515 goto nla_put_failure; 5516 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5517 if (!protoinfo) 5518 goto nla_put_failure; 5519 5520 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5521 goto nla_put_failure; 5522 5523 nla_nest_end(skb, protoinfo); 5524 nlmsg_end(skb, nlh); 5525 return 0; 5526 5527 nla_put_failure: 5528 nlmsg_cancel(skb, nlh); 5529 return -EMSGSIZE; 5530 } 5531 5532 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5533 { 5534 struct net *net = sock_net(skb->sk); 5535 int h, s_h; 5536 int idx = 0, s_idx; 5537 struct net_device *dev; 5538 struct inet6_dev *idev; 5539 struct hlist_head *head; 5540 5541 s_h = cb->args[0]; 5542 s_idx = cb->args[1]; 5543 5544 rcu_read_lock(); 5545 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5546 idx = 0; 5547 head = &net->dev_index_head[h]; 5548 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5549 if (idx < s_idx) 5550 goto cont; 5551 idev = __in6_dev_get(dev); 5552 if (!idev) 5553 goto cont; 5554 if (inet6_fill_ifinfo(skb, idev, 5555 NETLINK_CB(cb->skb).portid, 5556 cb->nlh->nlmsg_seq, 5557 RTM_NEWLINK, NLM_F_MULTI) < 0) 5558 goto out; 5559 cont: 5560 idx++; 5561 } 5562 } 5563 out: 5564 rcu_read_unlock(); 5565 cb->args[1] = idx; 5566 cb->args[0] = h; 5567 5568 return skb->len; 5569 } 5570 5571 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5572 { 5573 struct sk_buff *skb; 5574 struct net *net = dev_net(idev->dev); 5575 int err = -ENOBUFS; 5576 5577 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5578 if (!skb) 5579 goto errout; 5580 5581 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5582 if (err < 0) { 5583 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5584 WARN_ON(err == -EMSGSIZE); 5585 kfree_skb(skb); 5586 goto errout; 5587 } 5588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5589 return; 5590 errout: 5591 if (err < 0) 5592 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5593 } 5594 5595 static inline size_t inet6_prefix_nlmsg_size(void) 5596 { 5597 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5598 + nla_total_size(sizeof(struct in6_addr)) 5599 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5600 } 5601 5602 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5603 struct prefix_info *pinfo, u32 portid, u32 seq, 5604 int event, unsigned int flags) 5605 { 5606 struct prefixmsg *pmsg; 5607 struct nlmsghdr *nlh; 5608 struct prefix_cacheinfo ci; 5609 5610 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5611 if (!nlh) 5612 return -EMSGSIZE; 5613 5614 pmsg = nlmsg_data(nlh); 5615 pmsg->prefix_family = AF_INET6; 5616 pmsg->prefix_pad1 = 0; 5617 pmsg->prefix_pad2 = 0; 5618 pmsg->prefix_ifindex = idev->dev->ifindex; 5619 pmsg->prefix_len = pinfo->prefix_len; 5620 pmsg->prefix_type = pinfo->type; 5621 pmsg->prefix_pad3 = 0; 5622 pmsg->prefix_flags = 0; 5623 if (pinfo->onlink) 5624 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5625 if (pinfo->autoconf) 5626 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5627 5628 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5629 goto nla_put_failure; 5630 ci.preferred_time = ntohl(pinfo->prefered); 5631 ci.valid_time = ntohl(pinfo->valid); 5632 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5633 goto nla_put_failure; 5634 nlmsg_end(skb, nlh); 5635 return 0; 5636 5637 nla_put_failure: 5638 nlmsg_cancel(skb, nlh); 5639 return -EMSGSIZE; 5640 } 5641 5642 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5643 struct prefix_info *pinfo) 5644 { 5645 struct sk_buff *skb; 5646 struct net *net = dev_net(idev->dev); 5647 int err = -ENOBUFS; 5648 5649 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5650 if (!skb) 5651 goto errout; 5652 5653 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5654 if (err < 0) { 5655 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5656 WARN_ON(err == -EMSGSIZE); 5657 kfree_skb(skb); 5658 goto errout; 5659 } 5660 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5661 return; 5662 errout: 5663 if (err < 0) 5664 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5665 } 5666 5667 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5668 { 5669 struct net *net = dev_net(ifp->idev->dev); 5670 5671 if (event) 5672 ASSERT_RTNL(); 5673 5674 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5675 5676 switch (event) { 5677 case RTM_NEWADDR: 5678 /* 5679 * If the address was optimistic 5680 * we inserted the route at the start of 5681 * our DAD process, so we don't need 5682 * to do it again 5683 */ 5684 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5685 ip6_ins_rt(net, ifp->rt); 5686 if (ifp->idev->cnf.forwarding) 5687 addrconf_join_anycast(ifp); 5688 if (!ipv6_addr_any(&ifp->peer_addr)) 5689 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5690 ifp->idev->dev, 0, 0, 5691 GFP_ATOMIC); 5692 break; 5693 case RTM_DELADDR: 5694 if (ifp->idev->cnf.forwarding) 5695 addrconf_leave_anycast(ifp); 5696 addrconf_leave_solict(ifp->idev, &ifp->addr); 5697 if (!ipv6_addr_any(&ifp->peer_addr)) { 5698 struct fib6_info *rt; 5699 5700 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5701 ifp->idev->dev, 0, 0); 5702 if (rt) 5703 ip6_del_rt(net, rt); 5704 } 5705 if (ifp->rt) { 5706 ip6_del_rt(net, ifp->rt); 5707 ifp->rt = NULL; 5708 } 5709 rt_genid_bump_ipv6(net); 5710 break; 5711 } 5712 atomic_inc(&net->ipv6.dev_addr_genid); 5713 } 5714 5715 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5716 { 5717 rcu_read_lock_bh(); 5718 if (likely(ifp->idev->dead == 0)) 5719 __ipv6_ifa_notify(event, ifp); 5720 rcu_read_unlock_bh(); 5721 } 5722 5723 #ifdef CONFIG_SYSCTL 5724 5725 static 5726 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5727 void __user *buffer, size_t *lenp, loff_t *ppos) 5728 { 5729 int *valp = ctl->data; 5730 int val = *valp; 5731 loff_t pos = *ppos; 5732 struct ctl_table lctl; 5733 int ret; 5734 5735 /* 5736 * ctl->data points to idev->cnf.forwarding, we should 5737 * not modify it until we get the rtnl lock. 5738 */ 5739 lctl = *ctl; 5740 lctl.data = &val; 5741 5742 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5743 5744 if (write) 5745 ret = addrconf_fixup_forwarding(ctl, valp, val); 5746 if (ret) 5747 *ppos = pos; 5748 return ret; 5749 } 5750 5751 static 5752 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5753 void __user *buffer, size_t *lenp, loff_t *ppos) 5754 { 5755 struct inet6_dev *idev = ctl->extra1; 5756 int min_mtu = IPV6_MIN_MTU; 5757 struct ctl_table lctl; 5758 5759 lctl = *ctl; 5760 lctl.extra1 = &min_mtu; 5761 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5762 5763 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5764 } 5765 5766 static void dev_disable_change(struct inet6_dev *idev) 5767 { 5768 struct netdev_notifier_info info; 5769 5770 if (!idev || !idev->dev) 5771 return; 5772 5773 netdev_notifier_info_init(&info, idev->dev); 5774 if (idev->cnf.disable_ipv6) 5775 addrconf_notify(NULL, NETDEV_DOWN, &info); 5776 else 5777 addrconf_notify(NULL, NETDEV_UP, &info); 5778 } 5779 5780 static void addrconf_disable_change(struct net *net, __s32 newf) 5781 { 5782 struct net_device *dev; 5783 struct inet6_dev *idev; 5784 5785 for_each_netdev(net, dev) { 5786 idev = __in6_dev_get(dev); 5787 if (idev) { 5788 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5789 idev->cnf.disable_ipv6 = newf; 5790 if (changed) 5791 dev_disable_change(idev); 5792 } 5793 } 5794 } 5795 5796 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5797 { 5798 struct net *net; 5799 int old; 5800 5801 if (!rtnl_trylock()) 5802 return restart_syscall(); 5803 5804 net = (struct net *)table->extra2; 5805 old = *p; 5806 *p = newf; 5807 5808 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5809 rtnl_unlock(); 5810 return 0; 5811 } 5812 5813 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5814 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5815 addrconf_disable_change(net, newf); 5816 } else if ((!newf) ^ (!old)) 5817 dev_disable_change((struct inet6_dev *)table->extra1); 5818 5819 rtnl_unlock(); 5820 return 0; 5821 } 5822 5823 static 5824 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5825 void __user *buffer, size_t *lenp, loff_t *ppos) 5826 { 5827 int *valp = ctl->data; 5828 int val = *valp; 5829 loff_t pos = *ppos; 5830 struct ctl_table lctl; 5831 int ret; 5832 5833 /* 5834 * ctl->data points to idev->cnf.disable_ipv6, we should 5835 * not modify it until we get the rtnl lock. 5836 */ 5837 lctl = *ctl; 5838 lctl.data = &val; 5839 5840 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5841 5842 if (write) 5843 ret = addrconf_disable_ipv6(ctl, valp, val); 5844 if (ret) 5845 *ppos = pos; 5846 return ret; 5847 } 5848 5849 static 5850 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5851 void __user *buffer, size_t *lenp, loff_t *ppos) 5852 { 5853 int *valp = ctl->data; 5854 int ret; 5855 int old, new; 5856 5857 old = *valp; 5858 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5859 new = *valp; 5860 5861 if (write && old != new) { 5862 struct net *net = ctl->extra2; 5863 5864 if (!rtnl_trylock()) 5865 return restart_syscall(); 5866 5867 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5869 NETCONFA_PROXY_NEIGH, 5870 NETCONFA_IFINDEX_DEFAULT, 5871 net->ipv6.devconf_dflt); 5872 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5874 NETCONFA_PROXY_NEIGH, 5875 NETCONFA_IFINDEX_ALL, 5876 net->ipv6.devconf_all); 5877 else { 5878 struct inet6_dev *idev = ctl->extra1; 5879 5880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5881 NETCONFA_PROXY_NEIGH, 5882 idev->dev->ifindex, 5883 &idev->cnf); 5884 } 5885 rtnl_unlock(); 5886 } 5887 5888 return ret; 5889 } 5890 5891 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5892 void __user *buffer, size_t *lenp, 5893 loff_t *ppos) 5894 { 5895 int ret = 0; 5896 u32 new_val; 5897 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5898 struct net *net = (struct net *)ctl->extra2; 5899 struct ctl_table tmp = { 5900 .data = &new_val, 5901 .maxlen = sizeof(new_val), 5902 .mode = ctl->mode, 5903 }; 5904 5905 if (!rtnl_trylock()) 5906 return restart_syscall(); 5907 5908 new_val = *((u32 *)ctl->data); 5909 5910 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 5911 if (ret != 0) 5912 goto out; 5913 5914 if (write) { 5915 if (check_addr_gen_mode(new_val) < 0) { 5916 ret = -EINVAL; 5917 goto out; 5918 } 5919 5920 if (idev) { 5921 if (check_stable_privacy(idev, net, new_val) < 0) { 5922 ret = -EINVAL; 5923 goto out; 5924 } 5925 5926 if (idev->cnf.addr_gen_mode != new_val) { 5927 idev->cnf.addr_gen_mode = new_val; 5928 addrconf_dev_config(idev->dev); 5929 } 5930 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 5931 struct net_device *dev; 5932 5933 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 5934 for_each_netdev(net, dev) { 5935 idev = __in6_dev_get(dev); 5936 if (idev && 5937 idev->cnf.addr_gen_mode != new_val) { 5938 idev->cnf.addr_gen_mode = new_val; 5939 addrconf_dev_config(idev->dev); 5940 } 5941 } 5942 } 5943 5944 *((u32 *)ctl->data) = new_val; 5945 } 5946 5947 out: 5948 rtnl_unlock(); 5949 5950 return ret; 5951 } 5952 5953 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5954 void __user *buffer, size_t *lenp, 5955 loff_t *ppos) 5956 { 5957 int err; 5958 struct in6_addr addr; 5959 char str[IPV6_MAX_STRLEN]; 5960 struct ctl_table lctl = *ctl; 5961 struct net *net = ctl->extra2; 5962 struct ipv6_stable_secret *secret = ctl->data; 5963 5964 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5965 return -EIO; 5966 5967 lctl.maxlen = IPV6_MAX_STRLEN; 5968 lctl.data = str; 5969 5970 if (!rtnl_trylock()) 5971 return restart_syscall(); 5972 5973 if (!write && !secret->initialized) { 5974 err = -EIO; 5975 goto out; 5976 } 5977 5978 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5979 if (err >= sizeof(str)) { 5980 err = -EIO; 5981 goto out; 5982 } 5983 5984 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5985 if (err || !write) 5986 goto out; 5987 5988 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5989 err = -EIO; 5990 goto out; 5991 } 5992 5993 secret->initialized = true; 5994 secret->secret = addr; 5995 5996 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5997 struct net_device *dev; 5998 5999 for_each_netdev(net, dev) { 6000 struct inet6_dev *idev = __in6_dev_get(dev); 6001 6002 if (idev) { 6003 idev->cnf.addr_gen_mode = 6004 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6005 } 6006 } 6007 } else { 6008 struct inet6_dev *idev = ctl->extra1; 6009 6010 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6011 } 6012 6013 out: 6014 rtnl_unlock(); 6015 6016 return err; 6017 } 6018 6019 static 6020 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6021 int write, 6022 void __user *buffer, 6023 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 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6033 * we should not modify it until we get the rtnl lock. 6034 */ 6035 lctl = *ctl; 6036 lctl.data = &val; 6037 6038 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6039 6040 if (write) 6041 ret = addrconf_fixup_linkdown(ctl, valp, val); 6042 if (ret) 6043 *ppos = pos; 6044 return ret; 6045 } 6046 6047 static 6048 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6049 { 6050 if (rt) { 6051 if (action) 6052 rt->dst.flags |= DST_NOPOLICY; 6053 else 6054 rt->dst.flags &= ~DST_NOPOLICY; 6055 } 6056 } 6057 6058 static 6059 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6060 { 6061 struct inet6_ifaddr *ifa; 6062 6063 read_lock_bh(&idev->lock); 6064 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6065 spin_lock(&ifa->lock); 6066 if (ifa->rt) { 6067 struct fib6_info *rt = ifa->rt; 6068 int cpu; 6069 6070 rcu_read_lock(); 6071 ifa->rt->dst_nopolicy = val ? true : false; 6072 if (rt->rt6i_pcpu) { 6073 for_each_possible_cpu(cpu) { 6074 struct rt6_info **rtp; 6075 6076 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6077 addrconf_set_nopolicy(*rtp, val); 6078 } 6079 } 6080 rcu_read_unlock(); 6081 } 6082 spin_unlock(&ifa->lock); 6083 } 6084 read_unlock_bh(&idev->lock); 6085 } 6086 6087 static 6088 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6089 { 6090 struct inet6_dev *idev; 6091 struct net *net; 6092 6093 if (!rtnl_trylock()) 6094 return restart_syscall(); 6095 6096 *valp = val; 6097 6098 net = (struct net *)ctl->extra2; 6099 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6100 rtnl_unlock(); 6101 return 0; 6102 } 6103 6104 if (valp == &net->ipv6.devconf_all->disable_policy) { 6105 struct net_device *dev; 6106 6107 for_each_netdev(net, dev) { 6108 idev = __in6_dev_get(dev); 6109 if (idev) 6110 addrconf_disable_policy_idev(idev, val); 6111 } 6112 } else { 6113 idev = (struct inet6_dev *)ctl->extra1; 6114 addrconf_disable_policy_idev(idev, val); 6115 } 6116 6117 rtnl_unlock(); 6118 return 0; 6119 } 6120 6121 static 6122 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6123 void __user *buffer, size_t *lenp, 6124 loff_t *ppos) 6125 { 6126 int *valp = ctl->data; 6127 int val = *valp; 6128 loff_t pos = *ppos; 6129 struct ctl_table lctl; 6130 int ret; 6131 6132 lctl = *ctl; 6133 lctl.data = &val; 6134 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6135 6136 if (write && (*valp != val)) 6137 ret = addrconf_disable_policy(ctl, valp, val); 6138 6139 if (ret) 6140 *ppos = pos; 6141 6142 return ret; 6143 } 6144 6145 static int minus_one = -1; 6146 static const int zero = 0; 6147 static const int one = 1; 6148 static const int two_five_five = 255; 6149 6150 static const struct ctl_table addrconf_sysctl[] = { 6151 { 6152 .procname = "forwarding", 6153 .data = &ipv6_devconf.forwarding, 6154 .maxlen = sizeof(int), 6155 .mode = 0644, 6156 .proc_handler = addrconf_sysctl_forward, 6157 }, 6158 { 6159 .procname = "hop_limit", 6160 .data = &ipv6_devconf.hop_limit, 6161 .maxlen = sizeof(int), 6162 .mode = 0644, 6163 .proc_handler = proc_dointvec_minmax, 6164 .extra1 = (void *)&one, 6165 .extra2 = (void *)&two_five_five, 6166 }, 6167 { 6168 .procname = "mtu", 6169 .data = &ipv6_devconf.mtu6, 6170 .maxlen = sizeof(int), 6171 .mode = 0644, 6172 .proc_handler = addrconf_sysctl_mtu, 6173 }, 6174 { 6175 .procname = "accept_ra", 6176 .data = &ipv6_devconf.accept_ra, 6177 .maxlen = sizeof(int), 6178 .mode = 0644, 6179 .proc_handler = proc_dointvec, 6180 }, 6181 { 6182 .procname = "accept_redirects", 6183 .data = &ipv6_devconf.accept_redirects, 6184 .maxlen = sizeof(int), 6185 .mode = 0644, 6186 .proc_handler = proc_dointvec, 6187 }, 6188 { 6189 .procname = "autoconf", 6190 .data = &ipv6_devconf.autoconf, 6191 .maxlen = sizeof(int), 6192 .mode = 0644, 6193 .proc_handler = proc_dointvec, 6194 }, 6195 { 6196 .procname = "dad_transmits", 6197 .data = &ipv6_devconf.dad_transmits, 6198 .maxlen = sizeof(int), 6199 .mode = 0644, 6200 .proc_handler = proc_dointvec, 6201 }, 6202 { 6203 .procname = "router_solicitations", 6204 .data = &ipv6_devconf.rtr_solicits, 6205 .maxlen = sizeof(int), 6206 .mode = 0644, 6207 .proc_handler = proc_dointvec_minmax, 6208 .extra1 = &minus_one, 6209 }, 6210 { 6211 .procname = "router_solicitation_interval", 6212 .data = &ipv6_devconf.rtr_solicit_interval, 6213 .maxlen = sizeof(int), 6214 .mode = 0644, 6215 .proc_handler = proc_dointvec_jiffies, 6216 }, 6217 { 6218 .procname = "router_solicitation_max_interval", 6219 .data = &ipv6_devconf.rtr_solicit_max_interval, 6220 .maxlen = sizeof(int), 6221 .mode = 0644, 6222 .proc_handler = proc_dointvec_jiffies, 6223 }, 6224 { 6225 .procname = "router_solicitation_delay", 6226 .data = &ipv6_devconf.rtr_solicit_delay, 6227 .maxlen = sizeof(int), 6228 .mode = 0644, 6229 .proc_handler = proc_dointvec_jiffies, 6230 }, 6231 { 6232 .procname = "force_mld_version", 6233 .data = &ipv6_devconf.force_mld_version, 6234 .maxlen = sizeof(int), 6235 .mode = 0644, 6236 .proc_handler = proc_dointvec, 6237 }, 6238 { 6239 .procname = "mldv1_unsolicited_report_interval", 6240 .data = 6241 &ipv6_devconf.mldv1_unsolicited_report_interval, 6242 .maxlen = sizeof(int), 6243 .mode = 0644, 6244 .proc_handler = proc_dointvec_ms_jiffies, 6245 }, 6246 { 6247 .procname = "mldv2_unsolicited_report_interval", 6248 .data = 6249 &ipv6_devconf.mldv2_unsolicited_report_interval, 6250 .maxlen = sizeof(int), 6251 .mode = 0644, 6252 .proc_handler = proc_dointvec_ms_jiffies, 6253 }, 6254 { 6255 .procname = "use_tempaddr", 6256 .data = &ipv6_devconf.use_tempaddr, 6257 .maxlen = sizeof(int), 6258 .mode = 0644, 6259 .proc_handler = proc_dointvec, 6260 }, 6261 { 6262 .procname = "temp_valid_lft", 6263 .data = &ipv6_devconf.temp_valid_lft, 6264 .maxlen = sizeof(int), 6265 .mode = 0644, 6266 .proc_handler = proc_dointvec, 6267 }, 6268 { 6269 .procname = "temp_prefered_lft", 6270 .data = &ipv6_devconf.temp_prefered_lft, 6271 .maxlen = sizeof(int), 6272 .mode = 0644, 6273 .proc_handler = proc_dointvec, 6274 }, 6275 { 6276 .procname = "regen_max_retry", 6277 .data = &ipv6_devconf.regen_max_retry, 6278 .maxlen = sizeof(int), 6279 .mode = 0644, 6280 .proc_handler = proc_dointvec, 6281 }, 6282 { 6283 .procname = "max_desync_factor", 6284 .data = &ipv6_devconf.max_desync_factor, 6285 .maxlen = sizeof(int), 6286 .mode = 0644, 6287 .proc_handler = proc_dointvec, 6288 }, 6289 { 6290 .procname = "max_addresses", 6291 .data = &ipv6_devconf.max_addresses, 6292 .maxlen = sizeof(int), 6293 .mode = 0644, 6294 .proc_handler = proc_dointvec, 6295 }, 6296 { 6297 .procname = "accept_ra_defrtr", 6298 .data = &ipv6_devconf.accept_ra_defrtr, 6299 .maxlen = sizeof(int), 6300 .mode = 0644, 6301 .proc_handler = proc_dointvec, 6302 }, 6303 { 6304 .procname = "accept_ra_min_hop_limit", 6305 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6306 .maxlen = sizeof(int), 6307 .mode = 0644, 6308 .proc_handler = proc_dointvec, 6309 }, 6310 { 6311 .procname = "accept_ra_pinfo", 6312 .data = &ipv6_devconf.accept_ra_pinfo, 6313 .maxlen = sizeof(int), 6314 .mode = 0644, 6315 .proc_handler = proc_dointvec, 6316 }, 6317 #ifdef CONFIG_IPV6_ROUTER_PREF 6318 { 6319 .procname = "accept_ra_rtr_pref", 6320 .data = &ipv6_devconf.accept_ra_rtr_pref, 6321 .maxlen = sizeof(int), 6322 .mode = 0644, 6323 .proc_handler = proc_dointvec, 6324 }, 6325 { 6326 .procname = "router_probe_interval", 6327 .data = &ipv6_devconf.rtr_probe_interval, 6328 .maxlen = sizeof(int), 6329 .mode = 0644, 6330 .proc_handler = proc_dointvec_jiffies, 6331 }, 6332 #ifdef CONFIG_IPV6_ROUTE_INFO 6333 { 6334 .procname = "accept_ra_rt_info_min_plen", 6335 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6336 .maxlen = sizeof(int), 6337 .mode = 0644, 6338 .proc_handler = proc_dointvec, 6339 }, 6340 { 6341 .procname = "accept_ra_rt_info_max_plen", 6342 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6343 .maxlen = sizeof(int), 6344 .mode = 0644, 6345 .proc_handler = proc_dointvec, 6346 }, 6347 #endif 6348 #endif 6349 { 6350 .procname = "proxy_ndp", 6351 .data = &ipv6_devconf.proxy_ndp, 6352 .maxlen = sizeof(int), 6353 .mode = 0644, 6354 .proc_handler = addrconf_sysctl_proxy_ndp, 6355 }, 6356 { 6357 .procname = "accept_source_route", 6358 .data = &ipv6_devconf.accept_source_route, 6359 .maxlen = sizeof(int), 6360 .mode = 0644, 6361 .proc_handler = proc_dointvec, 6362 }, 6363 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6364 { 6365 .procname = "optimistic_dad", 6366 .data = &ipv6_devconf.optimistic_dad, 6367 .maxlen = sizeof(int), 6368 .mode = 0644, 6369 .proc_handler = proc_dointvec, 6370 }, 6371 { 6372 .procname = "use_optimistic", 6373 .data = &ipv6_devconf.use_optimistic, 6374 .maxlen = sizeof(int), 6375 .mode = 0644, 6376 .proc_handler = proc_dointvec, 6377 }, 6378 #endif 6379 #ifdef CONFIG_IPV6_MROUTE 6380 { 6381 .procname = "mc_forwarding", 6382 .data = &ipv6_devconf.mc_forwarding, 6383 .maxlen = sizeof(int), 6384 .mode = 0444, 6385 .proc_handler = proc_dointvec, 6386 }, 6387 #endif 6388 { 6389 .procname = "disable_ipv6", 6390 .data = &ipv6_devconf.disable_ipv6, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = addrconf_sysctl_disable, 6394 }, 6395 { 6396 .procname = "accept_dad", 6397 .data = &ipv6_devconf.accept_dad, 6398 .maxlen = sizeof(int), 6399 .mode = 0644, 6400 .proc_handler = proc_dointvec, 6401 }, 6402 { 6403 .procname = "force_tllao", 6404 .data = &ipv6_devconf.force_tllao, 6405 .maxlen = sizeof(int), 6406 .mode = 0644, 6407 .proc_handler = proc_dointvec 6408 }, 6409 { 6410 .procname = "ndisc_notify", 6411 .data = &ipv6_devconf.ndisc_notify, 6412 .maxlen = sizeof(int), 6413 .mode = 0644, 6414 .proc_handler = proc_dointvec 6415 }, 6416 { 6417 .procname = "suppress_frag_ndisc", 6418 .data = &ipv6_devconf.suppress_frag_ndisc, 6419 .maxlen = sizeof(int), 6420 .mode = 0644, 6421 .proc_handler = proc_dointvec 6422 }, 6423 { 6424 .procname = "accept_ra_from_local", 6425 .data = &ipv6_devconf.accept_ra_from_local, 6426 .maxlen = sizeof(int), 6427 .mode = 0644, 6428 .proc_handler = proc_dointvec, 6429 }, 6430 { 6431 .procname = "accept_ra_mtu", 6432 .data = &ipv6_devconf.accept_ra_mtu, 6433 .maxlen = sizeof(int), 6434 .mode = 0644, 6435 .proc_handler = proc_dointvec, 6436 }, 6437 { 6438 .procname = "stable_secret", 6439 .data = &ipv6_devconf.stable_secret, 6440 .maxlen = IPV6_MAX_STRLEN, 6441 .mode = 0600, 6442 .proc_handler = addrconf_sysctl_stable_secret, 6443 }, 6444 { 6445 .procname = "use_oif_addrs_only", 6446 .data = &ipv6_devconf.use_oif_addrs_only, 6447 .maxlen = sizeof(int), 6448 .mode = 0644, 6449 .proc_handler = proc_dointvec, 6450 }, 6451 { 6452 .procname = "ignore_routes_with_linkdown", 6453 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6454 .maxlen = sizeof(int), 6455 .mode = 0644, 6456 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6457 }, 6458 { 6459 .procname = "drop_unicast_in_l2_multicast", 6460 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6461 .maxlen = sizeof(int), 6462 .mode = 0644, 6463 .proc_handler = proc_dointvec, 6464 }, 6465 { 6466 .procname = "drop_unsolicited_na", 6467 .data = &ipv6_devconf.drop_unsolicited_na, 6468 .maxlen = sizeof(int), 6469 .mode = 0644, 6470 .proc_handler = proc_dointvec, 6471 }, 6472 { 6473 .procname = "keep_addr_on_down", 6474 .data = &ipv6_devconf.keep_addr_on_down, 6475 .maxlen = sizeof(int), 6476 .mode = 0644, 6477 .proc_handler = proc_dointvec, 6478 6479 }, 6480 { 6481 .procname = "seg6_enabled", 6482 .data = &ipv6_devconf.seg6_enabled, 6483 .maxlen = sizeof(int), 6484 .mode = 0644, 6485 .proc_handler = proc_dointvec, 6486 }, 6487 #ifdef CONFIG_IPV6_SEG6_HMAC 6488 { 6489 .procname = "seg6_require_hmac", 6490 .data = &ipv6_devconf.seg6_require_hmac, 6491 .maxlen = sizeof(int), 6492 .mode = 0644, 6493 .proc_handler = proc_dointvec, 6494 }, 6495 #endif 6496 { 6497 .procname = "enhanced_dad", 6498 .data = &ipv6_devconf.enhanced_dad, 6499 .maxlen = sizeof(int), 6500 .mode = 0644, 6501 .proc_handler = proc_dointvec, 6502 }, 6503 { 6504 .procname = "addr_gen_mode", 6505 .data = &ipv6_devconf.addr_gen_mode, 6506 .maxlen = sizeof(int), 6507 .mode = 0644, 6508 .proc_handler = addrconf_sysctl_addr_gen_mode, 6509 }, 6510 { 6511 .procname = "disable_policy", 6512 .data = &ipv6_devconf.disable_policy, 6513 .maxlen = sizeof(int), 6514 .mode = 0644, 6515 .proc_handler = addrconf_sysctl_disable_policy, 6516 }, 6517 { 6518 .procname = "ndisc_tclass", 6519 .data = &ipv6_devconf.ndisc_tclass, 6520 .maxlen = sizeof(int), 6521 .mode = 0644, 6522 .proc_handler = proc_dointvec_minmax, 6523 .extra1 = (void *)&zero, 6524 .extra2 = (void *)&two_five_five, 6525 }, 6526 { 6527 /* sentinel */ 6528 } 6529 }; 6530 6531 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6532 struct inet6_dev *idev, struct ipv6_devconf *p) 6533 { 6534 int i, ifindex; 6535 struct ctl_table *table; 6536 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6537 6538 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6539 if (!table) 6540 goto out; 6541 6542 for (i = 0; table[i].data; i++) { 6543 table[i].data += (char *)p - (char *)&ipv6_devconf; 6544 /* If one of these is already set, then it is not safe to 6545 * overwrite either of them: this makes proc_dointvec_minmax 6546 * usable. 6547 */ 6548 if (!table[i].extra1 && !table[i].extra2) { 6549 table[i].extra1 = idev; /* embedded; no ref */ 6550 table[i].extra2 = net; 6551 } 6552 } 6553 6554 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6555 6556 p->sysctl_header = register_net_sysctl(net, path, table); 6557 if (!p->sysctl_header) 6558 goto free; 6559 6560 if (!strcmp(dev_name, "all")) 6561 ifindex = NETCONFA_IFINDEX_ALL; 6562 else if (!strcmp(dev_name, "default")) 6563 ifindex = NETCONFA_IFINDEX_DEFAULT; 6564 else 6565 ifindex = idev->dev->ifindex; 6566 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6567 ifindex, p); 6568 return 0; 6569 6570 free: 6571 kfree(table); 6572 out: 6573 return -ENOBUFS; 6574 } 6575 6576 static void __addrconf_sysctl_unregister(struct net *net, 6577 struct ipv6_devconf *p, int ifindex) 6578 { 6579 struct ctl_table *table; 6580 6581 if (!p->sysctl_header) 6582 return; 6583 6584 table = p->sysctl_header->ctl_table_arg; 6585 unregister_net_sysctl_table(p->sysctl_header); 6586 p->sysctl_header = NULL; 6587 kfree(table); 6588 6589 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6590 } 6591 6592 static int addrconf_sysctl_register(struct inet6_dev *idev) 6593 { 6594 int err; 6595 6596 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6597 return -EINVAL; 6598 6599 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6600 &ndisc_ifinfo_sysctl_change); 6601 if (err) 6602 return err; 6603 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6604 idev, &idev->cnf); 6605 if (err) 6606 neigh_sysctl_unregister(idev->nd_parms); 6607 6608 return err; 6609 } 6610 6611 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6612 { 6613 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6614 idev->dev->ifindex); 6615 neigh_sysctl_unregister(idev->nd_parms); 6616 } 6617 6618 6619 #endif 6620 6621 static int __net_init addrconf_init_net(struct net *net) 6622 { 6623 int err = -ENOMEM; 6624 struct ipv6_devconf *all, *dflt; 6625 6626 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6627 if (!all) 6628 goto err_alloc_all; 6629 6630 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6631 if (!dflt) 6632 goto err_alloc_dflt; 6633 6634 /* these will be inherited by all namespaces */ 6635 dflt->autoconf = ipv6_defaults.autoconf; 6636 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6637 6638 dflt->stable_secret.initialized = false; 6639 all->stable_secret.initialized = false; 6640 6641 net->ipv6.devconf_all = all; 6642 net->ipv6.devconf_dflt = dflt; 6643 6644 #ifdef CONFIG_SYSCTL 6645 err = __addrconf_sysctl_register(net, "all", NULL, all); 6646 if (err < 0) 6647 goto err_reg_all; 6648 6649 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6650 if (err < 0) 6651 goto err_reg_dflt; 6652 #endif 6653 return 0; 6654 6655 #ifdef CONFIG_SYSCTL 6656 err_reg_dflt: 6657 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6658 err_reg_all: 6659 kfree(dflt); 6660 #endif 6661 err_alloc_dflt: 6662 kfree(all); 6663 err_alloc_all: 6664 return err; 6665 } 6666 6667 static void __net_exit addrconf_exit_net(struct net *net) 6668 { 6669 #ifdef CONFIG_SYSCTL 6670 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6671 NETCONFA_IFINDEX_DEFAULT); 6672 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6673 NETCONFA_IFINDEX_ALL); 6674 #endif 6675 kfree(net->ipv6.devconf_dflt); 6676 kfree(net->ipv6.devconf_all); 6677 } 6678 6679 static struct pernet_operations addrconf_ops = { 6680 .init = addrconf_init_net, 6681 .exit = addrconf_exit_net, 6682 }; 6683 6684 static struct rtnl_af_ops inet6_ops __read_mostly = { 6685 .family = AF_INET6, 6686 .fill_link_af = inet6_fill_link_af, 6687 .get_link_af_size = inet6_get_link_af_size, 6688 .validate_link_af = inet6_validate_link_af, 6689 .set_link_af = inet6_set_link_af, 6690 }; 6691 6692 /* 6693 * Init / cleanup code 6694 */ 6695 6696 int __init addrconf_init(void) 6697 { 6698 struct inet6_dev *idev; 6699 int i, err; 6700 6701 err = ipv6_addr_label_init(); 6702 if (err < 0) { 6703 pr_crit("%s: cannot initialize default policy table: %d\n", 6704 __func__, err); 6705 goto out; 6706 } 6707 6708 err = register_pernet_subsys(&addrconf_ops); 6709 if (err < 0) 6710 goto out_addrlabel; 6711 6712 addrconf_wq = create_workqueue("ipv6_addrconf"); 6713 if (!addrconf_wq) { 6714 err = -ENOMEM; 6715 goto out_nowq; 6716 } 6717 6718 /* The addrconf netdev notifier requires that loopback_dev 6719 * has it's ipv6 private information allocated and setup 6720 * before it can bring up and give link-local addresses 6721 * to other devices which are up. 6722 * 6723 * Unfortunately, loopback_dev is not necessarily the first 6724 * entry in the global dev_base list of net devices. In fact, 6725 * it is likely to be the very last entry on that list. 6726 * So this causes the notifier registry below to try and 6727 * give link-local addresses to all devices besides loopback_dev 6728 * first, then loopback_dev, which cases all the non-loopback_dev 6729 * devices to fail to get a link-local address. 6730 * 6731 * So, as a temporary fix, allocate the ipv6 structure for 6732 * loopback_dev first by hand. 6733 * Longer term, all of the dependencies ipv6 has upon the loopback 6734 * device and it being up should be removed. 6735 */ 6736 rtnl_lock(); 6737 idev = ipv6_add_dev(init_net.loopback_dev); 6738 rtnl_unlock(); 6739 if (IS_ERR(idev)) { 6740 err = PTR_ERR(idev); 6741 goto errlo; 6742 } 6743 6744 ip6_route_init_special_entries(); 6745 6746 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6747 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6748 6749 register_netdevice_notifier(&ipv6_dev_notf); 6750 6751 addrconf_verify(); 6752 6753 rtnl_af_register(&inet6_ops); 6754 6755 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6756 NULL, inet6_dump_ifinfo, 0); 6757 if (err < 0) 6758 goto errout; 6759 6760 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6761 inet6_rtm_newaddr, NULL, 0); 6762 if (err < 0) 6763 goto errout; 6764 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6765 inet6_rtm_deladdr, NULL, 0); 6766 if (err < 0) 6767 goto errout; 6768 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6769 inet6_rtm_getaddr, inet6_dump_ifaddr, 6770 RTNL_FLAG_DOIT_UNLOCKED); 6771 if (err < 0) 6772 goto errout; 6773 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6774 NULL, inet6_dump_ifmcaddr, 0); 6775 if (err < 0) 6776 goto errout; 6777 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6778 NULL, inet6_dump_ifacaddr, 0); 6779 if (err < 0) 6780 goto errout; 6781 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6782 inet6_netconf_get_devconf, 6783 inet6_netconf_dump_devconf, 6784 RTNL_FLAG_DOIT_UNLOCKED); 6785 if (err < 0) 6786 goto errout; 6787 err = ipv6_addr_label_rtnl_register(); 6788 if (err < 0) 6789 goto errout; 6790 6791 return 0; 6792 errout: 6793 rtnl_unregister_all(PF_INET6); 6794 rtnl_af_unregister(&inet6_ops); 6795 unregister_netdevice_notifier(&ipv6_dev_notf); 6796 errlo: 6797 destroy_workqueue(addrconf_wq); 6798 out_nowq: 6799 unregister_pernet_subsys(&addrconf_ops); 6800 out_addrlabel: 6801 ipv6_addr_label_cleanup(); 6802 out: 6803 return err; 6804 } 6805 6806 void addrconf_cleanup(void) 6807 { 6808 struct net_device *dev; 6809 int i; 6810 6811 unregister_netdevice_notifier(&ipv6_dev_notf); 6812 unregister_pernet_subsys(&addrconf_ops); 6813 ipv6_addr_label_cleanup(); 6814 6815 rtnl_af_unregister(&inet6_ops); 6816 6817 rtnl_lock(); 6818 6819 /* clean dev list */ 6820 for_each_netdev(&init_net, dev) { 6821 if (__in6_dev_get(dev) == NULL) 6822 continue; 6823 addrconf_ifdown(dev, 1); 6824 } 6825 addrconf_ifdown(init_net.loopback_dev, 2); 6826 6827 /* 6828 * Check hash table. 6829 */ 6830 spin_lock_bh(&addrconf_hash_lock); 6831 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6832 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6833 spin_unlock_bh(&addrconf_hash_lock); 6834 cancel_delayed_work(&addr_chk_work); 6835 rtnl_unlock(); 6836 6837 destroy_workqueue(addrconf_wq); 6838 } 6839