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 !netif_is_l3_master(idev->dev) && 1001 addr_type & IPV6_ADDR_LOOPBACK)) 1002 return ERR_PTR(-EADDRNOTAVAIL); 1003 1004 if (idev->dead) { 1005 err = -ENODEV; /*XXX*/ 1006 goto out; 1007 } 1008 1009 if (idev->cnf.disable_ipv6) { 1010 err = -EACCES; 1011 goto out; 1012 } 1013 1014 /* validator notifier needs to be blocking; 1015 * do not call in atomic context 1016 */ 1017 if (can_block) { 1018 struct in6_validator_info i6vi = { 1019 .i6vi_addr = *cfg->pfx, 1020 .i6vi_dev = idev, 1021 .extack = extack, 1022 }; 1023 1024 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1025 err = notifier_to_errno(err); 1026 if (err < 0) 1027 goto out; 1028 } 1029 1030 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1031 if (!ifa) { 1032 err = -ENOBUFS; 1033 goto out; 1034 } 1035 1036 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1037 if (IS_ERR(f6i)) { 1038 err = PTR_ERR(f6i); 1039 f6i = NULL; 1040 goto out; 1041 } 1042 1043 if (net->ipv6.devconf_all->disable_policy || 1044 idev->cnf.disable_policy) 1045 f6i->dst_nopolicy = true; 1046 1047 neigh_parms_data_state_setall(idev->nd_parms); 1048 1049 ifa->addr = *cfg->pfx; 1050 if (cfg->peer_pfx) 1051 ifa->peer_addr = *cfg->peer_pfx; 1052 1053 spin_lock_init(&ifa->lock); 1054 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1055 INIT_HLIST_NODE(&ifa->addr_lst); 1056 ifa->scope = cfg->scope; 1057 ifa->prefix_len = cfg->plen; 1058 ifa->rt_priority = cfg->rt_priority; 1059 ifa->flags = cfg->ifa_flags; 1060 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1061 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1062 ifa->flags |= IFA_F_TENTATIVE; 1063 ifa->valid_lft = cfg->valid_lft; 1064 ifa->prefered_lft = cfg->preferred_lft; 1065 ifa->cstamp = ifa->tstamp = jiffies; 1066 ifa->tokenized = false; 1067 1068 ifa->rt = f6i; 1069 1070 ifa->idev = idev; 1071 in6_dev_hold(idev); 1072 1073 /* For caller */ 1074 refcount_set(&ifa->refcnt, 1); 1075 1076 rcu_read_lock_bh(); 1077 1078 err = ipv6_add_addr_hash(idev->dev, ifa); 1079 if (err < 0) { 1080 rcu_read_unlock_bh(); 1081 goto out; 1082 } 1083 1084 write_lock(&idev->lock); 1085 1086 /* Add to inet6_dev unicast addr list. */ 1087 ipv6_link_dev_addr(idev, ifa); 1088 1089 if (ifa->flags&IFA_F_TEMPORARY) { 1090 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1091 in6_ifa_hold(ifa); 1092 } 1093 1094 in6_ifa_hold(ifa); 1095 write_unlock(&idev->lock); 1096 1097 rcu_read_unlock_bh(); 1098 1099 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1100 out: 1101 if (unlikely(err < 0)) { 1102 fib6_info_release(f6i); 1103 1104 if (ifa) { 1105 if (ifa->idev) 1106 in6_dev_put(ifa->idev); 1107 kfree(ifa); 1108 } 1109 ifa = ERR_PTR(err); 1110 } 1111 1112 return ifa; 1113 } 1114 1115 enum cleanup_prefix_rt_t { 1116 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1117 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1118 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1119 }; 1120 1121 /* 1122 * Check, whether the prefix for ifp would still need a prefix route 1123 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1124 * constants. 1125 * 1126 * 1) we don't purge prefix if address was not permanent. 1127 * prefix is managed by its own lifetime. 1128 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1129 * 3) if there are no addresses, delete prefix. 1130 * 4) if there are still other permanent address(es), 1131 * corresponding prefix is still permanent. 1132 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1133 * don't purge the prefix, assume user space is managing it. 1134 * 6) otherwise, update prefix lifetime to the 1135 * longest valid lifetime among the corresponding 1136 * addresses on the device. 1137 * Note: subsequent RA will update lifetime. 1138 **/ 1139 static enum cleanup_prefix_rt_t 1140 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1141 { 1142 struct inet6_ifaddr *ifa; 1143 struct inet6_dev *idev = ifp->idev; 1144 unsigned long lifetime; 1145 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1146 1147 *expires = jiffies; 1148 1149 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1150 if (ifa == ifp) 1151 continue; 1152 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1153 ifp->prefix_len)) 1154 continue; 1155 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1156 return CLEANUP_PREFIX_RT_NOP; 1157 1158 action = CLEANUP_PREFIX_RT_EXPIRE; 1159 1160 spin_lock(&ifa->lock); 1161 1162 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1163 /* 1164 * Note: Because this address is 1165 * not permanent, lifetime < 1166 * LONG_MAX / HZ here. 1167 */ 1168 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1169 *expires = ifa->tstamp + lifetime * HZ; 1170 spin_unlock(&ifa->lock); 1171 } 1172 1173 return action; 1174 } 1175 1176 static void 1177 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1178 { 1179 struct fib6_info *f6i; 1180 1181 f6i = addrconf_get_prefix_route(&ifp->addr, 1182 ifp->prefix_len, 1183 ifp->idev->dev, 1184 0, RTF_GATEWAY | RTF_DEFAULT); 1185 if (f6i) { 1186 if (del_rt) 1187 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1188 else { 1189 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1190 fib6_set_expires(f6i, expires); 1191 fib6_info_release(f6i); 1192 } 1193 } 1194 } 1195 1196 1197 /* This function wants to get referenced ifp and releases it before return */ 1198 1199 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1200 { 1201 int state; 1202 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1203 unsigned long expires; 1204 1205 ASSERT_RTNL(); 1206 1207 spin_lock_bh(&ifp->lock); 1208 state = ifp->state; 1209 ifp->state = INET6_IFADDR_STATE_DEAD; 1210 spin_unlock_bh(&ifp->lock); 1211 1212 if (state == INET6_IFADDR_STATE_DEAD) 1213 goto out; 1214 1215 spin_lock_bh(&addrconf_hash_lock); 1216 hlist_del_init_rcu(&ifp->addr_lst); 1217 spin_unlock_bh(&addrconf_hash_lock); 1218 1219 write_lock_bh(&ifp->idev->lock); 1220 1221 if (ifp->flags&IFA_F_TEMPORARY) { 1222 list_del(&ifp->tmp_list); 1223 if (ifp->ifpub) { 1224 in6_ifa_put(ifp->ifpub); 1225 ifp->ifpub = NULL; 1226 } 1227 __in6_ifa_put(ifp); 1228 } 1229 1230 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1231 action = check_cleanup_prefix_route(ifp, &expires); 1232 1233 list_del_rcu(&ifp->if_list); 1234 __in6_ifa_put(ifp); 1235 1236 write_unlock_bh(&ifp->idev->lock); 1237 1238 addrconf_del_dad_work(ifp); 1239 1240 ipv6_ifa_notify(RTM_DELADDR, ifp); 1241 1242 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1243 1244 if (action != CLEANUP_PREFIX_RT_NOP) { 1245 cleanup_prefix_route(ifp, expires, 1246 action == CLEANUP_PREFIX_RT_DEL); 1247 } 1248 1249 /* clean up prefsrc entries */ 1250 rt6_remove_prefsrc(ifp); 1251 out: 1252 in6_ifa_put(ifp); 1253 } 1254 1255 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1256 struct inet6_ifaddr *ift, 1257 bool block) 1258 { 1259 struct inet6_dev *idev = ifp->idev; 1260 struct in6_addr addr, *tmpaddr; 1261 unsigned long tmp_tstamp, age; 1262 unsigned long regen_advance; 1263 struct ifa6_config cfg; 1264 int ret = 0; 1265 unsigned long now = jiffies; 1266 long max_desync_factor; 1267 s32 cnf_temp_preferred_lft; 1268 1269 write_lock_bh(&idev->lock); 1270 if (ift) { 1271 spin_lock_bh(&ift->lock); 1272 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1273 spin_unlock_bh(&ift->lock); 1274 tmpaddr = &addr; 1275 } else { 1276 tmpaddr = NULL; 1277 } 1278 retry: 1279 in6_dev_hold(idev); 1280 if (idev->cnf.use_tempaddr <= 0) { 1281 write_unlock_bh(&idev->lock); 1282 pr_info("%s: use_tempaddr is disabled\n", __func__); 1283 in6_dev_put(idev); 1284 ret = -1; 1285 goto out; 1286 } 1287 spin_lock_bh(&ifp->lock); 1288 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1289 idev->cnf.use_tempaddr = -1; /*XXX*/ 1290 spin_unlock_bh(&ifp->lock); 1291 write_unlock_bh(&idev->lock); 1292 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1293 __func__); 1294 in6_dev_put(idev); 1295 ret = -1; 1296 goto out; 1297 } 1298 in6_ifa_hold(ifp); 1299 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1300 ipv6_try_regen_rndid(idev, tmpaddr); 1301 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1302 age = (now - ifp->tstamp) / HZ; 1303 1304 regen_advance = idev->cnf.regen_max_retry * 1305 idev->cnf.dad_transmits * 1306 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1307 1308 /* recalculate max_desync_factor each time and update 1309 * idev->desync_factor if it's larger 1310 */ 1311 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1312 max_desync_factor = min_t(__u32, 1313 idev->cnf.max_desync_factor, 1314 cnf_temp_preferred_lft - regen_advance); 1315 1316 if (unlikely(idev->desync_factor > max_desync_factor)) { 1317 if (max_desync_factor > 0) { 1318 get_random_bytes(&idev->desync_factor, 1319 sizeof(idev->desync_factor)); 1320 idev->desync_factor %= max_desync_factor; 1321 } else { 1322 idev->desync_factor = 0; 1323 } 1324 } 1325 1326 memset(&cfg, 0, sizeof(cfg)); 1327 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1328 idev->cnf.temp_valid_lft + age); 1329 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1330 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1331 1332 cfg.plen = ifp->prefix_len; 1333 tmp_tstamp = ifp->tstamp; 1334 spin_unlock_bh(&ifp->lock); 1335 1336 write_unlock_bh(&idev->lock); 1337 1338 /* A temporary address is created only if this calculated Preferred 1339 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1340 * an implementation must not create a temporary address with a zero 1341 * Preferred Lifetime. 1342 * Use age calculation as in addrconf_verify to avoid unnecessary 1343 * temporary addresses being generated. 1344 */ 1345 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1346 if (cfg.preferred_lft <= regen_advance + age) { 1347 in6_ifa_put(ifp); 1348 in6_dev_put(idev); 1349 ret = -1; 1350 goto out; 1351 } 1352 1353 cfg.ifa_flags = IFA_F_TEMPORARY; 1354 /* set in addrconf_prefix_rcv() */ 1355 if (ifp->flags & IFA_F_OPTIMISTIC) 1356 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1357 1358 cfg.pfx = &addr; 1359 cfg.scope = ipv6_addr_scope(cfg.pfx); 1360 1361 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1362 if (IS_ERR(ift)) { 1363 in6_ifa_put(ifp); 1364 in6_dev_put(idev); 1365 pr_info("%s: retry temporary address regeneration\n", __func__); 1366 tmpaddr = &addr; 1367 write_lock_bh(&idev->lock); 1368 goto retry; 1369 } 1370 1371 spin_lock_bh(&ift->lock); 1372 ift->ifpub = ifp; 1373 ift->cstamp = now; 1374 ift->tstamp = tmp_tstamp; 1375 spin_unlock_bh(&ift->lock); 1376 1377 addrconf_dad_start(ift); 1378 in6_ifa_put(ift); 1379 in6_dev_put(idev); 1380 out: 1381 return ret; 1382 } 1383 1384 /* 1385 * Choose an appropriate source address (RFC3484) 1386 */ 1387 enum { 1388 IPV6_SADDR_RULE_INIT = 0, 1389 IPV6_SADDR_RULE_LOCAL, 1390 IPV6_SADDR_RULE_SCOPE, 1391 IPV6_SADDR_RULE_PREFERRED, 1392 #ifdef CONFIG_IPV6_MIP6 1393 IPV6_SADDR_RULE_HOA, 1394 #endif 1395 IPV6_SADDR_RULE_OIF, 1396 IPV6_SADDR_RULE_LABEL, 1397 IPV6_SADDR_RULE_PRIVACY, 1398 IPV6_SADDR_RULE_ORCHID, 1399 IPV6_SADDR_RULE_PREFIX, 1400 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1401 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1402 #endif 1403 IPV6_SADDR_RULE_MAX 1404 }; 1405 1406 struct ipv6_saddr_score { 1407 int rule; 1408 int addr_type; 1409 struct inet6_ifaddr *ifa; 1410 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1411 int scopedist; 1412 int matchlen; 1413 }; 1414 1415 struct ipv6_saddr_dst { 1416 const struct in6_addr *addr; 1417 int ifindex; 1418 int scope; 1419 int label; 1420 unsigned int prefs; 1421 }; 1422 1423 static inline int ipv6_saddr_preferred(int type) 1424 { 1425 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1426 return 1; 1427 return 0; 1428 } 1429 1430 static bool ipv6_use_optimistic_addr(struct net *net, 1431 struct inet6_dev *idev) 1432 { 1433 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1434 if (!idev) 1435 return false; 1436 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1437 return false; 1438 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1439 return false; 1440 1441 return true; 1442 #else 1443 return false; 1444 #endif 1445 } 1446 1447 static bool ipv6_allow_optimistic_dad(struct net *net, 1448 struct inet6_dev *idev) 1449 { 1450 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1451 if (!idev) 1452 return false; 1453 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1454 return false; 1455 1456 return true; 1457 #else 1458 return false; 1459 #endif 1460 } 1461 1462 static int ipv6_get_saddr_eval(struct net *net, 1463 struct ipv6_saddr_score *score, 1464 struct ipv6_saddr_dst *dst, 1465 int i) 1466 { 1467 int ret; 1468 1469 if (i <= score->rule) { 1470 switch (i) { 1471 case IPV6_SADDR_RULE_SCOPE: 1472 ret = score->scopedist; 1473 break; 1474 case IPV6_SADDR_RULE_PREFIX: 1475 ret = score->matchlen; 1476 break; 1477 default: 1478 ret = !!test_bit(i, score->scorebits); 1479 } 1480 goto out; 1481 } 1482 1483 switch (i) { 1484 case IPV6_SADDR_RULE_INIT: 1485 /* Rule 0: remember if hiscore is not ready yet */ 1486 ret = !!score->ifa; 1487 break; 1488 case IPV6_SADDR_RULE_LOCAL: 1489 /* Rule 1: Prefer same address */ 1490 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1491 break; 1492 case IPV6_SADDR_RULE_SCOPE: 1493 /* Rule 2: Prefer appropriate scope 1494 * 1495 * ret 1496 * ^ 1497 * -1 | d 15 1498 * ---+--+-+---> scope 1499 * | 1500 * | d is scope of the destination. 1501 * B-d | \ 1502 * | \ <- smaller scope is better if 1503 * B-15 | \ if scope is enough for destination. 1504 * | ret = B - scope (-1 <= scope >= d <= 15). 1505 * d-C-1 | / 1506 * |/ <- greater is better 1507 * -C / if scope is not enough for destination. 1508 * /| ret = scope - C (-1 <= d < scope <= 15). 1509 * 1510 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1511 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1512 * Assume B = 0 and we get C > 29. 1513 */ 1514 ret = __ipv6_addr_src_scope(score->addr_type); 1515 if (ret >= dst->scope) 1516 ret = -ret; 1517 else 1518 ret -= 128; /* 30 is enough */ 1519 score->scopedist = ret; 1520 break; 1521 case IPV6_SADDR_RULE_PREFERRED: 1522 { 1523 /* Rule 3: Avoid deprecated and optimistic addresses */ 1524 u8 avoid = IFA_F_DEPRECATED; 1525 1526 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1527 avoid |= IFA_F_OPTIMISTIC; 1528 ret = ipv6_saddr_preferred(score->addr_type) || 1529 !(score->ifa->flags & avoid); 1530 break; 1531 } 1532 #ifdef CONFIG_IPV6_MIP6 1533 case IPV6_SADDR_RULE_HOA: 1534 { 1535 /* Rule 4: Prefer home address */ 1536 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1537 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1538 break; 1539 } 1540 #endif 1541 case IPV6_SADDR_RULE_OIF: 1542 /* Rule 5: Prefer outgoing interface */ 1543 ret = (!dst->ifindex || 1544 dst->ifindex == score->ifa->idev->dev->ifindex); 1545 break; 1546 case IPV6_SADDR_RULE_LABEL: 1547 /* Rule 6: Prefer matching label */ 1548 ret = ipv6_addr_label(net, 1549 &score->ifa->addr, score->addr_type, 1550 score->ifa->idev->dev->ifindex) == dst->label; 1551 break; 1552 case IPV6_SADDR_RULE_PRIVACY: 1553 { 1554 /* Rule 7: Prefer public address 1555 * Note: prefer temporary address if use_tempaddr >= 2 1556 */ 1557 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1558 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1559 score->ifa->idev->cnf.use_tempaddr >= 2; 1560 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1561 break; 1562 } 1563 case IPV6_SADDR_RULE_ORCHID: 1564 /* Rule 8-: Prefer ORCHID vs ORCHID or 1565 * non-ORCHID vs non-ORCHID 1566 */ 1567 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1568 ipv6_addr_orchid(dst->addr)); 1569 break; 1570 case IPV6_SADDR_RULE_PREFIX: 1571 /* Rule 8: Use longest matching prefix */ 1572 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1573 if (ret > score->ifa->prefix_len) 1574 ret = score->ifa->prefix_len; 1575 score->matchlen = ret; 1576 break; 1577 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1578 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1579 /* Optimistic addresses still have lower precedence than other 1580 * preferred addresses. 1581 */ 1582 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1583 break; 1584 #endif 1585 default: 1586 ret = 0; 1587 } 1588 1589 if (ret) 1590 __set_bit(i, score->scorebits); 1591 score->rule = i; 1592 out: 1593 return ret; 1594 } 1595 1596 static int __ipv6_dev_get_saddr(struct net *net, 1597 struct ipv6_saddr_dst *dst, 1598 struct inet6_dev *idev, 1599 struct ipv6_saddr_score *scores, 1600 int hiscore_idx) 1601 { 1602 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1603 1604 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1605 int i; 1606 1607 /* 1608 * - Tentative Address (RFC2462 section 5.4) 1609 * - A tentative address is not considered 1610 * "assigned to an interface" in the traditional 1611 * sense, unless it is also flagged as optimistic. 1612 * - Candidate Source Address (section 4) 1613 * - In any case, anycast addresses, multicast 1614 * addresses, and the unspecified address MUST 1615 * NOT be included in a candidate set. 1616 */ 1617 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1618 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1619 continue; 1620 1621 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1622 1623 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1624 score->addr_type & IPV6_ADDR_MULTICAST)) { 1625 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1626 idev->dev->name); 1627 continue; 1628 } 1629 1630 score->rule = -1; 1631 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1632 1633 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1634 int minihiscore, miniscore; 1635 1636 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1637 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1638 1639 if (minihiscore > miniscore) { 1640 if (i == IPV6_SADDR_RULE_SCOPE && 1641 score->scopedist > 0) { 1642 /* 1643 * special case: 1644 * each remaining entry 1645 * has too small (not enough) 1646 * scope, because ifa entries 1647 * are sorted by their scope 1648 * values. 1649 */ 1650 goto out; 1651 } 1652 break; 1653 } else if (minihiscore < miniscore) { 1654 swap(hiscore, score); 1655 hiscore_idx = 1 - hiscore_idx; 1656 1657 /* restore our iterator */ 1658 score->ifa = hiscore->ifa; 1659 1660 break; 1661 } 1662 } 1663 } 1664 out: 1665 return hiscore_idx; 1666 } 1667 1668 static int ipv6_get_saddr_master(struct net *net, 1669 const struct net_device *dst_dev, 1670 const struct net_device *master, 1671 struct ipv6_saddr_dst *dst, 1672 struct ipv6_saddr_score *scores, 1673 int hiscore_idx) 1674 { 1675 struct inet6_dev *idev; 1676 1677 idev = __in6_dev_get(dst_dev); 1678 if (idev) 1679 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1680 scores, hiscore_idx); 1681 1682 idev = __in6_dev_get(master); 1683 if (idev) 1684 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1685 scores, hiscore_idx); 1686 1687 return hiscore_idx; 1688 } 1689 1690 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1691 const struct in6_addr *daddr, unsigned int prefs, 1692 struct in6_addr *saddr) 1693 { 1694 struct ipv6_saddr_score scores[2], *hiscore; 1695 struct ipv6_saddr_dst dst; 1696 struct inet6_dev *idev; 1697 struct net_device *dev; 1698 int dst_type; 1699 bool use_oif_addr = false; 1700 int hiscore_idx = 0; 1701 int ret = 0; 1702 1703 dst_type = __ipv6_addr_type(daddr); 1704 dst.addr = daddr; 1705 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1706 dst.scope = __ipv6_addr_src_scope(dst_type); 1707 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1708 dst.prefs = prefs; 1709 1710 scores[hiscore_idx].rule = -1; 1711 scores[hiscore_idx].ifa = NULL; 1712 1713 rcu_read_lock(); 1714 1715 /* Candidate Source Address (section 4) 1716 * - multicast and link-local destination address, 1717 * the set of candidate source address MUST only 1718 * include addresses assigned to interfaces 1719 * belonging to the same link as the outgoing 1720 * interface. 1721 * (- For site-local destination addresses, the 1722 * set of candidate source addresses MUST only 1723 * include addresses assigned to interfaces 1724 * belonging to the same site as the outgoing 1725 * interface.) 1726 * - "It is RECOMMENDED that the candidate source addresses 1727 * be the set of unicast addresses assigned to the 1728 * interface that will be used to send to the destination 1729 * (the 'outgoing' interface)." (RFC 6724) 1730 */ 1731 if (dst_dev) { 1732 idev = __in6_dev_get(dst_dev); 1733 if ((dst_type & IPV6_ADDR_MULTICAST) || 1734 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1735 (idev && idev->cnf.use_oif_addrs_only)) { 1736 use_oif_addr = true; 1737 } 1738 } 1739 1740 if (use_oif_addr) { 1741 if (idev) 1742 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1743 } else { 1744 const struct net_device *master; 1745 int master_idx = 0; 1746 1747 /* if dst_dev exists and is enslaved to an L3 device, then 1748 * prefer addresses from dst_dev and then the master over 1749 * any other enslaved devices in the L3 domain. 1750 */ 1751 master = l3mdev_master_dev_rcu(dst_dev); 1752 if (master) { 1753 master_idx = master->ifindex; 1754 1755 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1756 master, &dst, 1757 scores, hiscore_idx); 1758 1759 if (scores[hiscore_idx].ifa) 1760 goto out; 1761 } 1762 1763 for_each_netdev_rcu(net, dev) { 1764 /* only consider addresses on devices in the 1765 * same L3 domain 1766 */ 1767 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1768 continue; 1769 idev = __in6_dev_get(dev); 1770 if (!idev) 1771 continue; 1772 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1773 } 1774 } 1775 1776 out: 1777 hiscore = &scores[hiscore_idx]; 1778 if (!hiscore->ifa) 1779 ret = -EADDRNOTAVAIL; 1780 else 1781 *saddr = hiscore->ifa->addr; 1782 1783 rcu_read_unlock(); 1784 return ret; 1785 } 1786 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1787 1788 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1789 u32 banned_flags) 1790 { 1791 struct inet6_ifaddr *ifp; 1792 int err = -EADDRNOTAVAIL; 1793 1794 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1795 if (ifp->scope > IFA_LINK) 1796 break; 1797 if (ifp->scope == IFA_LINK && 1798 !(ifp->flags & banned_flags)) { 1799 *addr = ifp->addr; 1800 err = 0; 1801 break; 1802 } 1803 } 1804 return err; 1805 } 1806 1807 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1808 u32 banned_flags) 1809 { 1810 struct inet6_dev *idev; 1811 int err = -EADDRNOTAVAIL; 1812 1813 rcu_read_lock(); 1814 idev = __in6_dev_get(dev); 1815 if (idev) { 1816 read_lock_bh(&idev->lock); 1817 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1818 read_unlock_bh(&idev->lock); 1819 } 1820 rcu_read_unlock(); 1821 return err; 1822 } 1823 1824 static int ipv6_count_addresses(const struct inet6_dev *idev) 1825 { 1826 const struct inet6_ifaddr *ifp; 1827 int cnt = 0; 1828 1829 rcu_read_lock(); 1830 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1831 cnt++; 1832 rcu_read_unlock(); 1833 return cnt; 1834 } 1835 1836 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1837 const struct net_device *dev, int strict) 1838 { 1839 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1840 strict, IFA_F_TENTATIVE); 1841 } 1842 EXPORT_SYMBOL(ipv6_chk_addr); 1843 1844 /* device argument is used to find the L3 domain of interest. If 1845 * skip_dev_check is set, then the ifp device is not checked against 1846 * the passed in dev argument. So the 2 cases for addresses checks are: 1847 * 1. does the address exist in the L3 domain that dev is part of 1848 * (skip_dev_check = true), or 1849 * 1850 * 2. does the address exist on the specific device 1851 * (skip_dev_check = false) 1852 */ 1853 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1854 const struct net_device *dev, bool skip_dev_check, 1855 int strict, u32 banned_flags) 1856 { 1857 unsigned int hash = inet6_addr_hash(net, addr); 1858 const struct net_device *l3mdev; 1859 struct inet6_ifaddr *ifp; 1860 u32 ifp_flags; 1861 1862 rcu_read_lock(); 1863 1864 l3mdev = l3mdev_master_dev_rcu(dev); 1865 if (skip_dev_check) 1866 dev = NULL; 1867 1868 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1869 if (!net_eq(dev_net(ifp->idev->dev), net)) 1870 continue; 1871 1872 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1873 continue; 1874 1875 /* Decouple optimistic from tentative for evaluation here. 1876 * Ban optimistic addresses explicitly, when required. 1877 */ 1878 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1879 ? (ifp->flags&~IFA_F_TENTATIVE) 1880 : ifp->flags; 1881 if (ipv6_addr_equal(&ifp->addr, addr) && 1882 !(ifp_flags&banned_flags) && 1883 (!dev || ifp->idev->dev == dev || 1884 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1885 rcu_read_unlock(); 1886 return 1; 1887 } 1888 } 1889 1890 rcu_read_unlock(); 1891 return 0; 1892 } 1893 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1894 1895 1896 /* Compares an address/prefix_len with addresses on device @dev. 1897 * If one is found it returns true. 1898 */ 1899 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1900 const unsigned int prefix_len, struct net_device *dev) 1901 { 1902 const struct inet6_ifaddr *ifa; 1903 const struct inet6_dev *idev; 1904 bool ret = false; 1905 1906 rcu_read_lock(); 1907 idev = __in6_dev_get(dev); 1908 if (idev) { 1909 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1910 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1911 if (ret) 1912 break; 1913 } 1914 } 1915 rcu_read_unlock(); 1916 1917 return ret; 1918 } 1919 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1920 1921 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1922 { 1923 const struct inet6_ifaddr *ifa; 1924 const struct inet6_dev *idev; 1925 int onlink; 1926 1927 onlink = 0; 1928 rcu_read_lock(); 1929 idev = __in6_dev_get(dev); 1930 if (idev) { 1931 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1932 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1933 ifa->prefix_len); 1934 if (onlink) 1935 break; 1936 } 1937 } 1938 rcu_read_unlock(); 1939 return onlink; 1940 } 1941 EXPORT_SYMBOL(ipv6_chk_prefix); 1942 1943 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1944 struct net_device *dev, int strict) 1945 { 1946 unsigned int hash = inet6_addr_hash(net, addr); 1947 struct inet6_ifaddr *ifp, *result = NULL; 1948 1949 rcu_read_lock(); 1950 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1951 if (!net_eq(dev_net(ifp->idev->dev), net)) 1952 continue; 1953 if (ipv6_addr_equal(&ifp->addr, addr)) { 1954 if (!dev || ifp->idev->dev == dev || 1955 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1956 result = ifp; 1957 in6_ifa_hold(ifp); 1958 break; 1959 } 1960 } 1961 } 1962 rcu_read_unlock(); 1963 1964 return result; 1965 } 1966 1967 /* Gets referenced address, destroys ifaddr */ 1968 1969 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1970 { 1971 if (dad_failed) 1972 ifp->flags |= IFA_F_DADFAILED; 1973 1974 if (ifp->flags&IFA_F_TEMPORARY) { 1975 struct inet6_ifaddr *ifpub; 1976 spin_lock_bh(&ifp->lock); 1977 ifpub = ifp->ifpub; 1978 if (ifpub) { 1979 in6_ifa_hold(ifpub); 1980 spin_unlock_bh(&ifp->lock); 1981 ipv6_create_tempaddr(ifpub, ifp, true); 1982 in6_ifa_put(ifpub); 1983 } else { 1984 spin_unlock_bh(&ifp->lock); 1985 } 1986 ipv6_del_addr(ifp); 1987 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1988 spin_lock_bh(&ifp->lock); 1989 addrconf_del_dad_work(ifp); 1990 ifp->flags |= IFA_F_TENTATIVE; 1991 if (dad_failed) 1992 ifp->flags &= ~IFA_F_OPTIMISTIC; 1993 spin_unlock_bh(&ifp->lock); 1994 if (dad_failed) 1995 ipv6_ifa_notify(0, ifp); 1996 in6_ifa_put(ifp); 1997 } else { 1998 ipv6_del_addr(ifp); 1999 } 2000 } 2001 2002 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2003 { 2004 int err = -ENOENT; 2005 2006 spin_lock_bh(&ifp->lock); 2007 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2008 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2009 err = 0; 2010 } 2011 spin_unlock_bh(&ifp->lock); 2012 2013 return err; 2014 } 2015 2016 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2017 { 2018 struct inet6_dev *idev = ifp->idev; 2019 struct net *net = dev_net(ifp->idev->dev); 2020 2021 if (addrconf_dad_end(ifp)) { 2022 in6_ifa_put(ifp); 2023 return; 2024 } 2025 2026 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2027 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2028 2029 spin_lock_bh(&ifp->lock); 2030 2031 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2032 struct in6_addr new_addr; 2033 struct inet6_ifaddr *ifp2; 2034 int retries = ifp->stable_privacy_retry + 1; 2035 struct ifa6_config cfg = { 2036 .pfx = &new_addr, 2037 .plen = ifp->prefix_len, 2038 .ifa_flags = ifp->flags, 2039 .valid_lft = ifp->valid_lft, 2040 .preferred_lft = ifp->prefered_lft, 2041 .scope = ifp->scope, 2042 }; 2043 2044 if (retries > net->ipv6.sysctl.idgen_retries) { 2045 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2046 ifp->idev->dev->name); 2047 goto errdad; 2048 } 2049 2050 new_addr = ifp->addr; 2051 if (ipv6_generate_stable_address(&new_addr, retries, 2052 idev)) 2053 goto errdad; 2054 2055 spin_unlock_bh(&ifp->lock); 2056 2057 if (idev->cnf.max_addresses && 2058 ipv6_count_addresses(idev) >= 2059 idev->cnf.max_addresses) 2060 goto lock_errdad; 2061 2062 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2063 ifp->idev->dev->name); 2064 2065 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2066 if (IS_ERR(ifp2)) 2067 goto lock_errdad; 2068 2069 spin_lock_bh(&ifp2->lock); 2070 ifp2->stable_privacy_retry = retries; 2071 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2072 spin_unlock_bh(&ifp2->lock); 2073 2074 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2075 in6_ifa_put(ifp2); 2076 lock_errdad: 2077 spin_lock_bh(&ifp->lock); 2078 } 2079 2080 errdad: 2081 /* transition from _POSTDAD to _ERRDAD */ 2082 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2083 spin_unlock_bh(&ifp->lock); 2084 2085 addrconf_mod_dad_work(ifp, 0); 2086 in6_ifa_put(ifp); 2087 } 2088 2089 /* Join to solicited addr multicast group. 2090 * caller must hold RTNL */ 2091 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2092 { 2093 struct in6_addr maddr; 2094 2095 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2096 return; 2097 2098 addrconf_addr_solict_mult(addr, &maddr); 2099 ipv6_dev_mc_inc(dev, &maddr); 2100 } 2101 2102 /* caller must hold RTNL */ 2103 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2104 { 2105 struct in6_addr maddr; 2106 2107 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2108 return; 2109 2110 addrconf_addr_solict_mult(addr, &maddr); 2111 __ipv6_dev_mc_dec(idev, &maddr); 2112 } 2113 2114 /* caller must hold RTNL */ 2115 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2116 { 2117 struct in6_addr addr; 2118 2119 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2120 return; 2121 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2122 if (ipv6_addr_any(&addr)) 2123 return; 2124 __ipv6_dev_ac_inc(ifp->idev, &addr); 2125 } 2126 2127 /* caller must hold RTNL */ 2128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2129 { 2130 struct in6_addr addr; 2131 2132 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2133 return; 2134 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2135 if (ipv6_addr_any(&addr)) 2136 return; 2137 __ipv6_dev_ac_dec(ifp->idev, &addr); 2138 } 2139 2140 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2141 { 2142 switch (dev->addr_len) { 2143 case ETH_ALEN: 2144 memcpy(eui, dev->dev_addr, 3); 2145 eui[3] = 0xFF; 2146 eui[4] = 0xFE; 2147 memcpy(eui + 5, dev->dev_addr + 3, 3); 2148 break; 2149 case EUI64_ADDR_LEN: 2150 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2151 eui[0] ^= 2; 2152 break; 2153 default: 2154 return -1; 2155 } 2156 2157 return 0; 2158 } 2159 2160 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2161 { 2162 union fwnet_hwaddr *ha; 2163 2164 if (dev->addr_len != FWNET_ALEN) 2165 return -1; 2166 2167 ha = (union fwnet_hwaddr *)dev->dev_addr; 2168 2169 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2170 eui[0] ^= 2; 2171 return 0; 2172 } 2173 2174 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2175 { 2176 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2177 if (dev->addr_len != ARCNET_ALEN) 2178 return -1; 2179 memset(eui, 0, 7); 2180 eui[7] = *(u8 *)dev->dev_addr; 2181 return 0; 2182 } 2183 2184 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2185 { 2186 if (dev->addr_len != INFINIBAND_ALEN) 2187 return -1; 2188 memcpy(eui, dev->dev_addr + 12, 8); 2189 eui[0] |= 2; 2190 return 0; 2191 } 2192 2193 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2194 { 2195 if (addr == 0) 2196 return -1; 2197 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2198 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2199 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2200 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2201 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2202 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2203 eui[1] = 0; 2204 eui[2] = 0x5E; 2205 eui[3] = 0xFE; 2206 memcpy(eui + 4, &addr, 4); 2207 return 0; 2208 } 2209 2210 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2211 { 2212 if (dev->priv_flags & IFF_ISATAP) 2213 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2214 return -1; 2215 } 2216 2217 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2218 { 2219 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2220 } 2221 2222 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2223 { 2224 memcpy(eui, dev->perm_addr, 3); 2225 memcpy(eui + 5, dev->perm_addr + 3, 3); 2226 eui[3] = 0xFF; 2227 eui[4] = 0xFE; 2228 eui[0] ^= 2; 2229 return 0; 2230 } 2231 2232 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2233 { 2234 switch (dev->type) { 2235 case ARPHRD_ETHER: 2236 case ARPHRD_FDDI: 2237 return addrconf_ifid_eui48(eui, dev); 2238 case ARPHRD_ARCNET: 2239 return addrconf_ifid_arcnet(eui, dev); 2240 case ARPHRD_INFINIBAND: 2241 return addrconf_ifid_infiniband(eui, dev); 2242 case ARPHRD_SIT: 2243 return addrconf_ifid_sit(eui, dev); 2244 case ARPHRD_IPGRE: 2245 case ARPHRD_TUNNEL: 2246 return addrconf_ifid_gre(eui, dev); 2247 case ARPHRD_6LOWPAN: 2248 return addrconf_ifid_6lowpan(eui, dev); 2249 case ARPHRD_IEEE1394: 2250 return addrconf_ifid_ieee1394(eui, dev); 2251 case ARPHRD_TUNNEL6: 2252 case ARPHRD_IP6GRE: 2253 case ARPHRD_RAWIP: 2254 return addrconf_ifid_ip6tnl(eui, dev); 2255 } 2256 return -1; 2257 } 2258 2259 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2260 { 2261 int err = -1; 2262 struct inet6_ifaddr *ifp; 2263 2264 read_lock_bh(&idev->lock); 2265 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2266 if (ifp->scope > IFA_LINK) 2267 break; 2268 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2269 memcpy(eui, ifp->addr.s6_addr+8, 8); 2270 err = 0; 2271 break; 2272 } 2273 } 2274 read_unlock_bh(&idev->lock); 2275 return err; 2276 } 2277 2278 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2279 static void ipv6_regen_rndid(struct inet6_dev *idev) 2280 { 2281 regen: 2282 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2283 idev->rndid[0] &= ~0x02; 2284 2285 /* 2286 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2287 * check if generated address is not inappropriate 2288 * 2289 * - Reserved subnet anycast (RFC 2526) 2290 * 11111101 11....11 1xxxxxxx 2291 * - ISATAP (RFC4214) 6.1 2292 * 00-00-5E-FE-xx-xx-xx-xx 2293 * - value 0 2294 * - XXX: already assigned to an address on the device 2295 */ 2296 if (idev->rndid[0] == 0xfd && 2297 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2298 (idev->rndid[7]&0x80)) 2299 goto regen; 2300 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2301 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2302 goto regen; 2303 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2304 goto regen; 2305 } 2306 } 2307 2308 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2309 { 2310 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2311 ipv6_regen_rndid(idev); 2312 } 2313 2314 /* 2315 * Add prefix route. 2316 */ 2317 2318 static void 2319 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2320 struct net_device *dev, unsigned long expires, 2321 u32 flags, gfp_t gfp_flags) 2322 { 2323 struct fib6_config cfg = { 2324 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2325 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2326 .fc_ifindex = dev->ifindex, 2327 .fc_expires = expires, 2328 .fc_dst_len = plen, 2329 .fc_flags = RTF_UP | flags, 2330 .fc_nlinfo.nl_net = dev_net(dev), 2331 .fc_protocol = RTPROT_KERNEL, 2332 .fc_type = RTN_UNICAST, 2333 }; 2334 2335 cfg.fc_dst = *pfx; 2336 2337 /* Prevent useless cloning on PtP SIT. 2338 This thing is done here expecting that the whole 2339 class of non-broadcast devices need not cloning. 2340 */ 2341 #if IS_ENABLED(CONFIG_IPV6_SIT) 2342 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2343 cfg.fc_flags |= RTF_NONEXTHOP; 2344 #endif 2345 2346 ip6_route_add(&cfg, gfp_flags, NULL); 2347 } 2348 2349 2350 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2351 int plen, 2352 const struct net_device *dev, 2353 u32 flags, u32 noflags) 2354 { 2355 struct fib6_node *fn; 2356 struct fib6_info *rt = NULL; 2357 struct fib6_table *table; 2358 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2359 2360 table = fib6_get_table(dev_net(dev), tb_id); 2361 if (!table) 2362 return NULL; 2363 2364 rcu_read_lock(); 2365 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2366 if (!fn) 2367 goto out; 2368 2369 for_each_fib6_node_rt_rcu(fn) { 2370 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2371 continue; 2372 if ((rt->fib6_flags & flags) != flags) 2373 continue; 2374 if ((rt->fib6_flags & noflags) != 0) 2375 continue; 2376 if (!fib6_info_hold_safe(rt)) 2377 continue; 2378 break; 2379 } 2380 out: 2381 rcu_read_unlock(); 2382 return rt; 2383 } 2384 2385 2386 /* Create "default" multicast route to the interface */ 2387 2388 static void addrconf_add_mroute(struct net_device *dev) 2389 { 2390 struct fib6_config cfg = { 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2392 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2393 .fc_ifindex = dev->ifindex, 2394 .fc_dst_len = 8, 2395 .fc_flags = RTF_UP, 2396 .fc_type = RTN_UNICAST, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 struct ifa6_config cfg = { 2511 .pfx = addr, 2512 .plen = pinfo->prefix_len, 2513 .ifa_flags = addr_flags, 2514 .valid_lft = valid_lft, 2515 .preferred_lft = prefered_lft, 2516 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2517 }; 2518 2519 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2520 if ((net->ipv6.devconf_all->optimistic_dad || 2521 in6_dev->cnf.optimistic_dad) && 2522 !net->ipv6.devconf_all->forwarding && sllao) 2523 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2524 #endif 2525 2526 /* Do not allow to create too much of autoconfigured 2527 * addresses; this would be too easy way to crash kernel. 2528 */ 2529 if (!max_addresses || 2530 ipv6_count_addresses(in6_dev) < max_addresses) 2531 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2532 2533 if (IS_ERR_OR_NULL(ifp)) 2534 return -1; 2535 2536 create = 1; 2537 spin_lock_bh(&ifp->lock); 2538 ifp->flags |= IFA_F_MANAGETEMPADDR; 2539 ifp->cstamp = jiffies; 2540 ifp->tokenized = tokenized; 2541 spin_unlock_bh(&ifp->lock); 2542 addrconf_dad_start(ifp); 2543 } 2544 2545 if (ifp) { 2546 u32 flags; 2547 unsigned long now; 2548 u32 stored_lft; 2549 2550 /* update lifetime (RFC2462 5.5.3 e) */ 2551 spin_lock_bh(&ifp->lock); 2552 now = jiffies; 2553 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2554 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2555 else 2556 stored_lft = 0; 2557 if (!create && stored_lft) { 2558 const u32 minimum_lft = min_t(u32, 2559 stored_lft, MIN_VALID_LIFETIME); 2560 valid_lft = max(valid_lft, minimum_lft); 2561 2562 /* RFC4862 Section 5.5.3e: 2563 * "Note that the preferred lifetime of the 2564 * corresponding address is always reset to 2565 * the Preferred Lifetime in the received 2566 * Prefix Information option, regardless of 2567 * whether the valid lifetime is also reset or 2568 * ignored." 2569 * 2570 * So we should always update prefered_lft here. 2571 */ 2572 update_lft = 1; 2573 } 2574 2575 if (update_lft) { 2576 ifp->valid_lft = valid_lft; 2577 ifp->prefered_lft = prefered_lft; 2578 ifp->tstamp = now; 2579 flags = ifp->flags; 2580 ifp->flags &= ~IFA_F_DEPRECATED; 2581 spin_unlock_bh(&ifp->lock); 2582 2583 if (!(flags&IFA_F_TENTATIVE)) 2584 ipv6_ifa_notify(0, ifp); 2585 } else 2586 spin_unlock_bh(&ifp->lock); 2587 2588 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2589 create, now); 2590 2591 in6_ifa_put(ifp); 2592 addrconf_verify(); 2593 } 2594 2595 return 0; 2596 } 2597 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2598 2599 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2600 { 2601 struct prefix_info *pinfo; 2602 __u32 valid_lft; 2603 __u32 prefered_lft; 2604 int addr_type, err; 2605 u32 addr_flags = 0; 2606 struct inet6_dev *in6_dev; 2607 struct net *net = dev_net(dev); 2608 2609 pinfo = (struct prefix_info *) opt; 2610 2611 if (len < sizeof(struct prefix_info)) { 2612 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2613 return; 2614 } 2615 2616 /* 2617 * Validation checks ([ADDRCONF], page 19) 2618 */ 2619 2620 addr_type = ipv6_addr_type(&pinfo->prefix); 2621 2622 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2623 return; 2624 2625 valid_lft = ntohl(pinfo->valid); 2626 prefered_lft = ntohl(pinfo->prefered); 2627 2628 if (prefered_lft > valid_lft) { 2629 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2630 return; 2631 } 2632 2633 in6_dev = in6_dev_get(dev); 2634 2635 if (!in6_dev) { 2636 net_dbg_ratelimited("addrconf: device %s not configured\n", 2637 dev->name); 2638 return; 2639 } 2640 2641 /* 2642 * Two things going on here: 2643 * 1) Add routes for on-link prefixes 2644 * 2) Configure prefixes with the auto flag set 2645 */ 2646 2647 if (pinfo->onlink) { 2648 struct fib6_info *rt; 2649 unsigned long rt_expires; 2650 2651 /* Avoid arithmetic overflow. Really, we could 2652 * save rt_expires in seconds, likely valid_lft, 2653 * but it would require division in fib gc, that it 2654 * not good. 2655 */ 2656 if (HZ > USER_HZ) 2657 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2658 else 2659 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2660 2661 if (addrconf_finite_timeout(rt_expires)) 2662 rt_expires *= HZ; 2663 2664 rt = addrconf_get_prefix_route(&pinfo->prefix, 2665 pinfo->prefix_len, 2666 dev, 2667 RTF_ADDRCONF | RTF_PREFIX_RT, 2668 RTF_GATEWAY | RTF_DEFAULT); 2669 2670 if (rt) { 2671 /* Autoconf prefix route */ 2672 if (valid_lft == 0) { 2673 ip6_del_rt(net, rt); 2674 rt = NULL; 2675 } else if (addrconf_finite_timeout(rt_expires)) { 2676 /* not infinity */ 2677 fib6_set_expires(rt, jiffies + rt_expires); 2678 } else { 2679 fib6_clean_expires(rt); 2680 } 2681 } else if (valid_lft) { 2682 clock_t expires = 0; 2683 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2684 if (addrconf_finite_timeout(rt_expires)) { 2685 /* not infinity */ 2686 flags |= RTF_EXPIRES; 2687 expires = jiffies_to_clock_t(rt_expires); 2688 } 2689 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2690 0, dev, expires, flags, 2691 GFP_ATOMIC); 2692 } 2693 fib6_info_release(rt); 2694 } 2695 2696 /* Try to figure out our local address for this prefix */ 2697 2698 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2699 struct in6_addr addr; 2700 bool tokenized = false, dev_addr_generated = false; 2701 2702 if (pinfo->prefix_len == 64) { 2703 memcpy(&addr, &pinfo->prefix, 8); 2704 2705 if (!ipv6_addr_any(&in6_dev->token)) { 2706 read_lock_bh(&in6_dev->lock); 2707 memcpy(addr.s6_addr + 8, 2708 in6_dev->token.s6_addr + 8, 8); 2709 read_unlock_bh(&in6_dev->lock); 2710 tokenized = true; 2711 } else if (is_addr_mode_generate_stable(in6_dev) && 2712 !ipv6_generate_stable_address(&addr, 0, 2713 in6_dev)) { 2714 addr_flags |= IFA_F_STABLE_PRIVACY; 2715 goto ok; 2716 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2717 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2718 goto put; 2719 } else { 2720 dev_addr_generated = true; 2721 } 2722 goto ok; 2723 } 2724 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2725 pinfo->prefix_len); 2726 goto put; 2727 2728 ok: 2729 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2730 &addr, addr_type, 2731 addr_flags, sllao, 2732 tokenized, valid_lft, 2733 prefered_lft); 2734 if (err) 2735 goto put; 2736 2737 /* Ignore error case here because previous prefix add addr was 2738 * successful which will be notified. 2739 */ 2740 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2741 addr_type, addr_flags, sllao, 2742 tokenized, valid_lft, 2743 prefered_lft, 2744 dev_addr_generated); 2745 } 2746 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2747 put: 2748 in6_dev_put(in6_dev); 2749 } 2750 2751 /* 2752 * Set destination address. 2753 * Special case for SIT interfaces where we create a new "virtual" 2754 * device. 2755 */ 2756 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2757 { 2758 struct in6_ifreq ireq; 2759 struct net_device *dev; 2760 int err = -EINVAL; 2761 2762 rtnl_lock(); 2763 2764 err = -EFAULT; 2765 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2766 goto err_exit; 2767 2768 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2769 2770 err = -ENODEV; 2771 if (!dev) 2772 goto err_exit; 2773 2774 #if IS_ENABLED(CONFIG_IPV6_SIT) 2775 if (dev->type == ARPHRD_SIT) { 2776 const struct net_device_ops *ops = dev->netdev_ops; 2777 struct ifreq ifr; 2778 struct ip_tunnel_parm p; 2779 2780 err = -EADDRNOTAVAIL; 2781 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2782 goto err_exit; 2783 2784 memset(&p, 0, sizeof(p)); 2785 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2786 p.iph.saddr = 0; 2787 p.iph.version = 4; 2788 p.iph.ihl = 5; 2789 p.iph.protocol = IPPROTO_IPV6; 2790 p.iph.ttl = 64; 2791 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2792 2793 if (ops->ndo_do_ioctl) { 2794 mm_segment_t oldfs = get_fs(); 2795 2796 set_fs(KERNEL_DS); 2797 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2798 set_fs(oldfs); 2799 } else 2800 err = -EOPNOTSUPP; 2801 2802 if (err == 0) { 2803 err = -ENOBUFS; 2804 dev = __dev_get_by_name(net, p.name); 2805 if (!dev) 2806 goto err_exit; 2807 err = dev_open(dev); 2808 } 2809 } 2810 #endif 2811 2812 err_exit: 2813 rtnl_unlock(); 2814 return err; 2815 } 2816 2817 static int ipv6_mc_config(struct sock *sk, bool join, 2818 const struct in6_addr *addr, int ifindex) 2819 { 2820 int ret; 2821 2822 ASSERT_RTNL(); 2823 2824 lock_sock(sk); 2825 if (join) 2826 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2827 else 2828 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2829 release_sock(sk); 2830 2831 return ret; 2832 } 2833 2834 /* 2835 * Manual configuration of address on an interface 2836 */ 2837 static int inet6_addr_add(struct net *net, int ifindex, 2838 struct ifa6_config *cfg, 2839 struct netlink_ext_ack *extack) 2840 { 2841 struct inet6_ifaddr *ifp; 2842 struct inet6_dev *idev; 2843 struct net_device *dev; 2844 unsigned long timeout; 2845 clock_t expires; 2846 u32 flags; 2847 2848 ASSERT_RTNL(); 2849 2850 if (cfg->plen > 128) 2851 return -EINVAL; 2852 2853 /* check the lifetime */ 2854 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2855 return -EINVAL; 2856 2857 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2858 return -EINVAL; 2859 2860 dev = __dev_get_by_index(net, ifindex); 2861 if (!dev) 2862 return -ENODEV; 2863 2864 idev = addrconf_add_dev(dev); 2865 if (IS_ERR(idev)) 2866 return PTR_ERR(idev); 2867 2868 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2870 true, cfg->pfx, ifindex); 2871 2872 if (ret < 0) 2873 return ret; 2874 } 2875 2876 cfg->scope = ipv6_addr_scope(cfg->pfx); 2877 2878 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2879 if (addrconf_finite_timeout(timeout)) { 2880 expires = jiffies_to_clock_t(timeout * HZ); 2881 cfg->valid_lft = timeout; 2882 flags = RTF_EXPIRES; 2883 } else { 2884 expires = 0; 2885 flags = 0; 2886 cfg->ifa_flags |= IFA_F_PERMANENT; 2887 } 2888 2889 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2890 if (addrconf_finite_timeout(timeout)) { 2891 if (timeout == 0) 2892 cfg->ifa_flags |= IFA_F_DEPRECATED; 2893 cfg->preferred_lft = timeout; 2894 } 2895 2896 ifp = ipv6_add_addr(idev, cfg, true, extack); 2897 if (!IS_ERR(ifp)) { 2898 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2899 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2900 ifp->rt_priority, dev, expires, 2901 flags, GFP_KERNEL); 2902 } 2903 2904 /* Send a netlink notification if DAD is enabled and 2905 * optimistic flag is not set 2906 */ 2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2908 ipv6_ifa_notify(0, ifp); 2909 /* 2910 * Note that section 3.1 of RFC 4429 indicates 2911 * that the Optimistic flag should not be set for 2912 * manually configured addresses 2913 */ 2914 addrconf_dad_start(ifp); 2915 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2916 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2917 cfg->preferred_lft, true, jiffies); 2918 in6_ifa_put(ifp); 2919 addrconf_verify_rtnl(); 2920 return 0; 2921 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2923 cfg->pfx, ifindex); 2924 } 2925 2926 return PTR_ERR(ifp); 2927 } 2928 2929 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2930 const struct in6_addr *pfx, unsigned int plen) 2931 { 2932 struct inet6_ifaddr *ifp; 2933 struct inet6_dev *idev; 2934 struct net_device *dev; 2935 2936 if (plen > 128) 2937 return -EINVAL; 2938 2939 dev = __dev_get_by_index(net, ifindex); 2940 if (!dev) 2941 return -ENODEV; 2942 2943 idev = __in6_dev_get(dev); 2944 if (!idev) 2945 return -ENXIO; 2946 2947 read_lock_bh(&idev->lock); 2948 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2949 if (ifp->prefix_len == plen && 2950 ipv6_addr_equal(pfx, &ifp->addr)) { 2951 in6_ifa_hold(ifp); 2952 read_unlock_bh(&idev->lock); 2953 2954 if (!(ifp->flags & IFA_F_TEMPORARY) && 2955 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2956 manage_tempaddrs(idev, ifp, 0, 0, false, 2957 jiffies); 2958 ipv6_del_addr(ifp); 2959 addrconf_verify_rtnl(); 2960 if (ipv6_addr_is_multicast(pfx)) { 2961 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2962 false, pfx, dev->ifindex); 2963 } 2964 return 0; 2965 } 2966 } 2967 read_unlock_bh(&idev->lock); 2968 return -EADDRNOTAVAIL; 2969 } 2970 2971 2972 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2973 { 2974 struct ifa6_config cfg = { 2975 .ifa_flags = IFA_F_PERMANENT, 2976 .preferred_lft = INFINITY_LIFE_TIME, 2977 .valid_lft = INFINITY_LIFE_TIME, 2978 }; 2979 struct in6_ifreq ireq; 2980 int err; 2981 2982 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2983 return -EPERM; 2984 2985 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2986 return -EFAULT; 2987 2988 cfg.pfx = &ireq.ifr6_addr; 2989 cfg.plen = ireq.ifr6_prefixlen; 2990 2991 rtnl_lock(); 2992 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 2993 rtnl_unlock(); 2994 return err; 2995 } 2996 2997 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2998 { 2999 struct in6_ifreq ireq; 3000 int err; 3001 3002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3003 return -EPERM; 3004 3005 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3006 return -EFAULT; 3007 3008 rtnl_lock(); 3009 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3010 ireq.ifr6_prefixlen); 3011 rtnl_unlock(); 3012 return err; 3013 } 3014 3015 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3016 int plen, int scope) 3017 { 3018 struct inet6_ifaddr *ifp; 3019 struct ifa6_config cfg = { 3020 .pfx = addr, 3021 .plen = plen, 3022 .ifa_flags = IFA_F_PERMANENT, 3023 .valid_lft = INFINITY_LIFE_TIME, 3024 .preferred_lft = INFINITY_LIFE_TIME, 3025 .scope = scope 3026 }; 3027 3028 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3029 if (!IS_ERR(ifp)) { 3030 spin_lock_bh(&ifp->lock); 3031 ifp->flags &= ~IFA_F_TENTATIVE; 3032 spin_unlock_bh(&ifp->lock); 3033 rt_genid_bump_ipv6(dev_net(idev->dev)); 3034 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3035 in6_ifa_put(ifp); 3036 } 3037 } 3038 3039 #if IS_ENABLED(CONFIG_IPV6_SIT) 3040 static void sit_add_v4_addrs(struct inet6_dev *idev) 3041 { 3042 struct in6_addr addr; 3043 struct net_device *dev; 3044 struct net *net = dev_net(idev->dev); 3045 int scope, plen; 3046 u32 pflags = 0; 3047 3048 ASSERT_RTNL(); 3049 3050 memset(&addr, 0, sizeof(struct in6_addr)); 3051 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3052 3053 if (idev->dev->flags&IFF_POINTOPOINT) { 3054 addr.s6_addr32[0] = htonl(0xfe800000); 3055 scope = IFA_LINK; 3056 plen = 64; 3057 } else { 3058 scope = IPV6_ADDR_COMPATv4; 3059 plen = 96; 3060 pflags |= RTF_NONEXTHOP; 3061 } 3062 3063 if (addr.s6_addr32[3]) { 3064 add_addr(idev, &addr, plen, scope); 3065 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3066 GFP_KERNEL); 3067 return; 3068 } 3069 3070 for_each_netdev(net, dev) { 3071 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3072 if (in_dev && (dev->flags & IFF_UP)) { 3073 struct in_ifaddr *ifa; 3074 3075 int flag = scope; 3076 3077 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3078 3079 addr.s6_addr32[3] = ifa->ifa_local; 3080 3081 if (ifa->ifa_scope == RT_SCOPE_LINK) 3082 continue; 3083 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3084 if (idev->dev->flags&IFF_POINTOPOINT) 3085 continue; 3086 flag |= IFA_HOST; 3087 } 3088 3089 add_addr(idev, &addr, plen, flag); 3090 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3091 0, pflags, GFP_KERNEL); 3092 } 3093 } 3094 } 3095 } 3096 #endif 3097 3098 static void init_loopback(struct net_device *dev) 3099 { 3100 struct inet6_dev *idev; 3101 3102 /* ::1 */ 3103 3104 ASSERT_RTNL(); 3105 3106 idev = ipv6_find_idev(dev); 3107 if (!idev) { 3108 pr_debug("%s: add_dev failed\n", __func__); 3109 return; 3110 } 3111 3112 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3113 } 3114 3115 void addrconf_add_linklocal(struct inet6_dev *idev, 3116 const struct in6_addr *addr, u32 flags) 3117 { 3118 struct ifa6_config cfg = { 3119 .pfx = addr, 3120 .plen = 64, 3121 .ifa_flags = flags | IFA_F_PERMANENT, 3122 .valid_lft = INFINITY_LIFE_TIME, 3123 .preferred_lft = INFINITY_LIFE_TIME, 3124 .scope = IFA_LINK 3125 }; 3126 struct inet6_ifaddr *ifp; 3127 3128 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3129 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3130 idev->cnf.optimistic_dad) && 3131 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3132 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3133 #endif 3134 3135 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3136 if (!IS_ERR(ifp)) { 3137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3138 0, 0, GFP_ATOMIC); 3139 addrconf_dad_start(ifp); 3140 in6_ifa_put(ifp); 3141 } 3142 } 3143 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3144 3145 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3146 { 3147 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3148 return true; 3149 3150 if (address.s6_addr32[2] == htonl(0x02005eff) && 3151 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3152 return true; 3153 3154 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3155 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3156 return true; 3157 3158 return false; 3159 } 3160 3161 static int ipv6_generate_stable_address(struct in6_addr *address, 3162 u8 dad_count, 3163 const struct inet6_dev *idev) 3164 { 3165 static DEFINE_SPINLOCK(lock); 3166 static __u32 digest[SHA_DIGEST_WORDS]; 3167 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3168 3169 static union { 3170 char __data[SHA_MESSAGE_BYTES]; 3171 struct { 3172 struct in6_addr secret; 3173 __be32 prefix[2]; 3174 unsigned char hwaddr[MAX_ADDR_LEN]; 3175 u8 dad_count; 3176 } __packed; 3177 } data; 3178 3179 struct in6_addr secret; 3180 struct in6_addr temp; 3181 struct net *net = dev_net(idev->dev); 3182 3183 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3184 3185 if (idev->cnf.stable_secret.initialized) 3186 secret = idev->cnf.stable_secret.secret; 3187 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3188 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3189 else 3190 return -1; 3191 3192 retry: 3193 spin_lock_bh(&lock); 3194 3195 sha_init(digest); 3196 memset(&data, 0, sizeof(data)); 3197 memset(workspace, 0, sizeof(workspace)); 3198 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3199 data.prefix[0] = address->s6_addr32[0]; 3200 data.prefix[1] = address->s6_addr32[1]; 3201 data.secret = secret; 3202 data.dad_count = dad_count; 3203 3204 sha_transform(digest, data.__data, workspace); 3205 3206 temp = *address; 3207 temp.s6_addr32[2] = (__force __be32)digest[0]; 3208 temp.s6_addr32[3] = (__force __be32)digest[1]; 3209 3210 spin_unlock_bh(&lock); 3211 3212 if (ipv6_reserved_interfaceid(temp)) { 3213 dad_count++; 3214 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3215 return -1; 3216 goto retry; 3217 } 3218 3219 *address = temp; 3220 return 0; 3221 } 3222 3223 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3224 { 3225 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3226 3227 if (s->initialized) 3228 return; 3229 s = &idev->cnf.stable_secret; 3230 get_random_bytes(&s->secret, sizeof(s->secret)); 3231 s->initialized = true; 3232 } 3233 3234 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3235 { 3236 struct in6_addr addr; 3237 3238 /* no link local addresses on L3 master devices */ 3239 if (netif_is_l3_master(idev->dev)) 3240 return; 3241 3242 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3243 3244 switch (idev->cnf.addr_gen_mode) { 3245 case IN6_ADDR_GEN_MODE_RANDOM: 3246 ipv6_gen_mode_random_init(idev); 3247 /* fallthrough */ 3248 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3249 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3250 addrconf_add_linklocal(idev, &addr, 3251 IFA_F_STABLE_PRIVACY); 3252 else if (prefix_route) 3253 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3254 0, 0, GFP_KERNEL); 3255 break; 3256 case IN6_ADDR_GEN_MODE_EUI64: 3257 /* addrconf_add_linklocal also adds a prefix_route and we 3258 * only need to care about prefix routes if ipv6_generate_eui64 3259 * couldn't generate one. 3260 */ 3261 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3262 addrconf_add_linklocal(idev, &addr, 0); 3263 else if (prefix_route) 3264 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3265 0, 0, GFP_KERNEL); 3266 break; 3267 case IN6_ADDR_GEN_MODE_NONE: 3268 default: 3269 /* will not add any link local address */ 3270 break; 3271 } 3272 } 3273 3274 static void addrconf_dev_config(struct net_device *dev) 3275 { 3276 struct inet6_dev *idev; 3277 3278 ASSERT_RTNL(); 3279 3280 if ((dev->type != ARPHRD_ETHER) && 3281 (dev->type != ARPHRD_FDDI) && 3282 (dev->type != ARPHRD_ARCNET) && 3283 (dev->type != ARPHRD_INFINIBAND) && 3284 (dev->type != ARPHRD_IEEE1394) && 3285 (dev->type != ARPHRD_TUNNEL6) && 3286 (dev->type != ARPHRD_6LOWPAN) && 3287 (dev->type != ARPHRD_IP6GRE) && 3288 (dev->type != ARPHRD_IPGRE) && 3289 (dev->type != ARPHRD_TUNNEL) && 3290 (dev->type != ARPHRD_NONE) && 3291 (dev->type != ARPHRD_RAWIP)) { 3292 /* Alas, we support only Ethernet autoconfiguration. */ 3293 return; 3294 } 3295 3296 idev = addrconf_add_dev(dev); 3297 if (IS_ERR(idev)) 3298 return; 3299 3300 /* this device type has no EUI support */ 3301 if (dev->type == ARPHRD_NONE && 3302 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3303 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3304 3305 addrconf_addr_gen(idev, false); 3306 } 3307 3308 #if IS_ENABLED(CONFIG_IPV6_SIT) 3309 static void addrconf_sit_config(struct net_device *dev) 3310 { 3311 struct inet6_dev *idev; 3312 3313 ASSERT_RTNL(); 3314 3315 /* 3316 * Configure the tunnel with one of our IPv4 3317 * addresses... we should configure all of 3318 * our v4 addrs in the tunnel 3319 */ 3320 3321 idev = ipv6_find_idev(dev); 3322 if (!idev) { 3323 pr_debug("%s: add_dev failed\n", __func__); 3324 return; 3325 } 3326 3327 if (dev->priv_flags & IFF_ISATAP) { 3328 addrconf_addr_gen(idev, false); 3329 return; 3330 } 3331 3332 sit_add_v4_addrs(idev); 3333 3334 if (dev->flags&IFF_POINTOPOINT) 3335 addrconf_add_mroute(dev); 3336 } 3337 #endif 3338 3339 #if IS_ENABLED(CONFIG_NET_IPGRE) 3340 static void addrconf_gre_config(struct net_device *dev) 3341 { 3342 struct inet6_dev *idev; 3343 3344 ASSERT_RTNL(); 3345 3346 idev = ipv6_find_idev(dev); 3347 if (!idev) { 3348 pr_debug("%s: add_dev failed\n", __func__); 3349 return; 3350 } 3351 3352 addrconf_addr_gen(idev, true); 3353 if (dev->flags & IFF_POINTOPOINT) 3354 addrconf_add_mroute(dev); 3355 } 3356 #endif 3357 3358 static int fixup_permanent_addr(struct net *net, 3359 struct inet6_dev *idev, 3360 struct inet6_ifaddr *ifp) 3361 { 3362 /* !fib6_node means the host route was removed from the 3363 * FIB, for example, if 'lo' device is taken down. In that 3364 * case regenerate the host route. 3365 */ 3366 if (!ifp->rt || !ifp->rt->fib6_node) { 3367 struct fib6_info *f6i, *prev; 3368 3369 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3370 GFP_ATOMIC); 3371 if (IS_ERR(f6i)) 3372 return PTR_ERR(f6i); 3373 3374 /* ifp->rt can be accessed outside of rtnl */ 3375 spin_lock(&ifp->lock); 3376 prev = ifp->rt; 3377 ifp->rt = f6i; 3378 spin_unlock(&ifp->lock); 3379 3380 fib6_info_release(prev); 3381 } 3382 3383 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3384 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3385 ifp->rt_priority, idev->dev, 0, 0, 3386 GFP_ATOMIC); 3387 } 3388 3389 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3390 addrconf_dad_start(ifp); 3391 3392 return 0; 3393 } 3394 3395 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3396 { 3397 struct inet6_ifaddr *ifp, *tmp; 3398 struct inet6_dev *idev; 3399 3400 idev = __in6_dev_get(dev); 3401 if (!idev) 3402 return; 3403 3404 write_lock_bh(&idev->lock); 3405 3406 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3407 if ((ifp->flags & IFA_F_PERMANENT) && 3408 fixup_permanent_addr(net, idev, ifp) < 0) { 3409 write_unlock_bh(&idev->lock); 3410 in6_ifa_hold(ifp); 3411 ipv6_del_addr(ifp); 3412 write_lock_bh(&idev->lock); 3413 3414 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3415 idev->dev->name, &ifp->addr); 3416 } 3417 } 3418 3419 write_unlock_bh(&idev->lock); 3420 } 3421 3422 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3423 void *ptr) 3424 { 3425 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3426 struct netdev_notifier_changeupper_info *info; 3427 struct inet6_dev *idev = __in6_dev_get(dev); 3428 struct net *net = dev_net(dev); 3429 int run_pending = 0; 3430 int err; 3431 3432 switch (event) { 3433 case NETDEV_REGISTER: 3434 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3435 idev = ipv6_add_dev(dev); 3436 if (IS_ERR(idev)) 3437 return notifier_from_errno(PTR_ERR(idev)); 3438 } 3439 break; 3440 3441 case NETDEV_CHANGEMTU: 3442 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3443 if (dev->mtu < IPV6_MIN_MTU) { 3444 addrconf_ifdown(dev, dev != net->loopback_dev); 3445 break; 3446 } 3447 3448 if (idev) { 3449 rt6_mtu_change(dev, dev->mtu); 3450 idev->cnf.mtu6 = dev->mtu; 3451 break; 3452 } 3453 3454 /* allocate new idev */ 3455 idev = ipv6_add_dev(dev); 3456 if (IS_ERR(idev)) 3457 break; 3458 3459 /* device is still not ready */ 3460 if (!(idev->if_flags & IF_READY)) 3461 break; 3462 3463 run_pending = 1; 3464 3465 /* fall through */ 3466 3467 case NETDEV_UP: 3468 case NETDEV_CHANGE: 3469 if (dev->flags & IFF_SLAVE) 3470 break; 3471 3472 if (idev && idev->cnf.disable_ipv6) 3473 break; 3474 3475 if (event == NETDEV_UP) { 3476 /* restore routes for permanent addresses */ 3477 addrconf_permanent_addr(net, dev); 3478 3479 if (!addrconf_link_ready(dev)) { 3480 /* device is not ready yet. */ 3481 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3482 dev->name); 3483 break; 3484 } 3485 3486 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3487 idev = ipv6_add_dev(dev); 3488 3489 if (!IS_ERR_OR_NULL(idev)) { 3490 idev->if_flags |= IF_READY; 3491 run_pending = 1; 3492 } 3493 } else if (event == NETDEV_CHANGE) { 3494 if (!addrconf_link_ready(dev)) { 3495 /* device is still not ready. */ 3496 rt6_sync_down_dev(dev, event); 3497 break; 3498 } 3499 3500 if (idev) { 3501 if (idev->if_flags & IF_READY) { 3502 /* device is already configured - 3503 * but resend MLD reports, we might 3504 * have roamed and need to update 3505 * multicast snooping switches 3506 */ 3507 ipv6_mc_up(idev); 3508 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3509 break; 3510 } 3511 idev->if_flags |= IF_READY; 3512 } 3513 3514 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3515 dev->name); 3516 3517 run_pending = 1; 3518 } 3519 3520 switch (dev->type) { 3521 #if IS_ENABLED(CONFIG_IPV6_SIT) 3522 case ARPHRD_SIT: 3523 addrconf_sit_config(dev); 3524 break; 3525 #endif 3526 #if IS_ENABLED(CONFIG_NET_IPGRE) 3527 case ARPHRD_IPGRE: 3528 addrconf_gre_config(dev); 3529 break; 3530 #endif 3531 case ARPHRD_LOOPBACK: 3532 init_loopback(dev); 3533 break; 3534 3535 default: 3536 addrconf_dev_config(dev); 3537 break; 3538 } 3539 3540 if (!IS_ERR_OR_NULL(idev)) { 3541 if (run_pending) 3542 addrconf_dad_run(idev); 3543 3544 /* Device has an address by now */ 3545 rt6_sync_up(dev, RTNH_F_DEAD); 3546 3547 /* 3548 * If the MTU changed during the interface down, 3549 * when the interface up, the changed MTU must be 3550 * reflected in the idev as well as routers. 3551 */ 3552 if (idev->cnf.mtu6 != dev->mtu && 3553 dev->mtu >= IPV6_MIN_MTU) { 3554 rt6_mtu_change(dev, dev->mtu); 3555 idev->cnf.mtu6 = dev->mtu; 3556 } 3557 idev->tstamp = jiffies; 3558 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3559 3560 /* 3561 * If the changed mtu during down is lower than 3562 * IPV6_MIN_MTU stop IPv6 on this interface. 3563 */ 3564 if (dev->mtu < IPV6_MIN_MTU) 3565 addrconf_ifdown(dev, dev != net->loopback_dev); 3566 } 3567 break; 3568 3569 case NETDEV_DOWN: 3570 case NETDEV_UNREGISTER: 3571 /* 3572 * Remove all addresses from this interface. 3573 */ 3574 addrconf_ifdown(dev, event != NETDEV_DOWN); 3575 break; 3576 3577 case NETDEV_CHANGENAME: 3578 if (idev) { 3579 snmp6_unregister_dev(idev); 3580 addrconf_sysctl_unregister(idev); 3581 err = addrconf_sysctl_register(idev); 3582 if (err) 3583 return notifier_from_errno(err); 3584 err = snmp6_register_dev(idev); 3585 if (err) { 3586 addrconf_sysctl_unregister(idev); 3587 return notifier_from_errno(err); 3588 } 3589 } 3590 break; 3591 3592 case NETDEV_PRE_TYPE_CHANGE: 3593 case NETDEV_POST_TYPE_CHANGE: 3594 if (idev) 3595 addrconf_type_change(dev, event); 3596 break; 3597 3598 case NETDEV_CHANGEUPPER: 3599 info = ptr; 3600 3601 /* flush all routes if dev is linked to or unlinked from 3602 * an L3 master device (e.g., VRF) 3603 */ 3604 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3605 addrconf_ifdown(dev, 0); 3606 } 3607 3608 return NOTIFY_OK; 3609 } 3610 3611 /* 3612 * addrconf module should be notified of a device going up 3613 */ 3614 static struct notifier_block ipv6_dev_notf = { 3615 .notifier_call = addrconf_notify, 3616 .priority = ADDRCONF_NOTIFY_PRIORITY, 3617 }; 3618 3619 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3620 { 3621 struct inet6_dev *idev; 3622 ASSERT_RTNL(); 3623 3624 idev = __in6_dev_get(dev); 3625 3626 if (event == NETDEV_POST_TYPE_CHANGE) 3627 ipv6_mc_remap(idev); 3628 else if (event == NETDEV_PRE_TYPE_CHANGE) 3629 ipv6_mc_unmap(idev); 3630 } 3631 3632 static bool addr_is_local(const struct in6_addr *addr) 3633 { 3634 return ipv6_addr_type(addr) & 3635 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3636 } 3637 3638 static int addrconf_ifdown(struct net_device *dev, int how) 3639 { 3640 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3641 struct net *net = dev_net(dev); 3642 struct inet6_dev *idev; 3643 struct inet6_ifaddr *ifa, *tmp; 3644 bool keep_addr = false; 3645 int state, i; 3646 3647 ASSERT_RTNL(); 3648 3649 rt6_disable_ip(dev, event); 3650 3651 idev = __in6_dev_get(dev); 3652 if (!idev) 3653 return -ENODEV; 3654 3655 /* 3656 * Step 1: remove reference to ipv6 device from parent device. 3657 * Do not dev_put! 3658 */ 3659 if (how) { 3660 idev->dead = 1; 3661 3662 /* protected by rtnl_lock */ 3663 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3664 3665 /* Step 1.5: remove snmp6 entry */ 3666 snmp6_unregister_dev(idev); 3667 3668 } 3669 3670 /* combine the user config with event to determine if permanent 3671 * addresses are to be removed from address hash table 3672 */ 3673 if (!how && !idev->cnf.disable_ipv6) { 3674 /* aggregate the system setting and interface setting */ 3675 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3676 3677 if (!_keep_addr) 3678 _keep_addr = idev->cnf.keep_addr_on_down; 3679 3680 keep_addr = (_keep_addr > 0); 3681 } 3682 3683 /* Step 2: clear hash table */ 3684 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3685 struct hlist_head *h = &inet6_addr_lst[i]; 3686 3687 spin_lock_bh(&addrconf_hash_lock); 3688 restart: 3689 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3690 if (ifa->idev == idev) { 3691 addrconf_del_dad_work(ifa); 3692 /* combined flag + permanent flag decide if 3693 * address is retained on a down event 3694 */ 3695 if (!keep_addr || 3696 !(ifa->flags & IFA_F_PERMANENT) || 3697 addr_is_local(&ifa->addr)) { 3698 hlist_del_init_rcu(&ifa->addr_lst); 3699 goto restart; 3700 } 3701 } 3702 } 3703 spin_unlock_bh(&addrconf_hash_lock); 3704 } 3705 3706 write_lock_bh(&idev->lock); 3707 3708 addrconf_del_rs_timer(idev); 3709 3710 /* Step 2: clear flags for stateless addrconf */ 3711 if (!how) 3712 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3713 3714 /* Step 3: clear tempaddr list */ 3715 while (!list_empty(&idev->tempaddr_list)) { 3716 ifa = list_first_entry(&idev->tempaddr_list, 3717 struct inet6_ifaddr, tmp_list); 3718 list_del(&ifa->tmp_list); 3719 write_unlock_bh(&idev->lock); 3720 spin_lock_bh(&ifa->lock); 3721 3722 if (ifa->ifpub) { 3723 in6_ifa_put(ifa->ifpub); 3724 ifa->ifpub = NULL; 3725 } 3726 spin_unlock_bh(&ifa->lock); 3727 in6_ifa_put(ifa); 3728 write_lock_bh(&idev->lock); 3729 } 3730 3731 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3732 struct fib6_info *rt = NULL; 3733 bool keep; 3734 3735 addrconf_del_dad_work(ifa); 3736 3737 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3738 !addr_is_local(&ifa->addr); 3739 3740 write_unlock_bh(&idev->lock); 3741 spin_lock_bh(&ifa->lock); 3742 3743 if (keep) { 3744 /* set state to skip the notifier below */ 3745 state = INET6_IFADDR_STATE_DEAD; 3746 ifa->state = INET6_IFADDR_STATE_PREDAD; 3747 if (!(ifa->flags & IFA_F_NODAD)) 3748 ifa->flags |= IFA_F_TENTATIVE; 3749 3750 rt = ifa->rt; 3751 ifa->rt = NULL; 3752 } else { 3753 state = ifa->state; 3754 ifa->state = INET6_IFADDR_STATE_DEAD; 3755 } 3756 3757 spin_unlock_bh(&ifa->lock); 3758 3759 if (rt) 3760 ip6_del_rt(net, rt); 3761 3762 if (state != INET6_IFADDR_STATE_DEAD) { 3763 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3764 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3765 } else { 3766 if (idev->cnf.forwarding) 3767 addrconf_leave_anycast(ifa); 3768 addrconf_leave_solict(ifa->idev, &ifa->addr); 3769 } 3770 3771 write_lock_bh(&idev->lock); 3772 if (!keep) { 3773 list_del_rcu(&ifa->if_list); 3774 in6_ifa_put(ifa); 3775 } 3776 } 3777 3778 write_unlock_bh(&idev->lock); 3779 3780 /* Step 5: Discard anycast and multicast list */ 3781 if (how) { 3782 ipv6_ac_destroy_dev(idev); 3783 ipv6_mc_destroy_dev(idev); 3784 } else { 3785 ipv6_mc_down(idev); 3786 } 3787 3788 idev->tstamp = jiffies; 3789 3790 /* Last: Shot the device (if unregistered) */ 3791 if (how) { 3792 addrconf_sysctl_unregister(idev); 3793 neigh_parms_release(&nd_tbl, idev->nd_parms); 3794 neigh_ifdown(&nd_tbl, dev); 3795 in6_dev_put(idev); 3796 } 3797 return 0; 3798 } 3799 3800 static void addrconf_rs_timer(struct timer_list *t) 3801 { 3802 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3803 struct net_device *dev = idev->dev; 3804 struct in6_addr lladdr; 3805 3806 write_lock(&idev->lock); 3807 if (idev->dead || !(idev->if_flags & IF_READY)) 3808 goto out; 3809 3810 if (!ipv6_accept_ra(idev)) 3811 goto out; 3812 3813 /* Announcement received after solicitation was sent */ 3814 if (idev->if_flags & IF_RA_RCVD) 3815 goto out; 3816 3817 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3818 write_unlock(&idev->lock); 3819 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3820 ndisc_send_rs(dev, &lladdr, 3821 &in6addr_linklocal_allrouters); 3822 else 3823 goto put; 3824 3825 write_lock(&idev->lock); 3826 idev->rs_interval = rfc3315_s14_backoff_update( 3827 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3828 /* The wait after the last probe can be shorter */ 3829 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3830 idev->cnf.rtr_solicits) ? 3831 idev->cnf.rtr_solicit_delay : 3832 idev->rs_interval); 3833 } else { 3834 /* 3835 * Note: we do not support deprecated "all on-link" 3836 * assumption any longer. 3837 */ 3838 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3839 } 3840 3841 out: 3842 write_unlock(&idev->lock); 3843 put: 3844 in6_dev_put(idev); 3845 } 3846 3847 /* 3848 * Duplicate Address Detection 3849 */ 3850 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3851 { 3852 unsigned long rand_num; 3853 struct inet6_dev *idev = ifp->idev; 3854 u64 nonce; 3855 3856 if (ifp->flags & IFA_F_OPTIMISTIC) 3857 rand_num = 0; 3858 else 3859 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3860 3861 nonce = 0; 3862 if (idev->cnf.enhanced_dad || 3863 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3864 do 3865 get_random_bytes(&nonce, 6); 3866 while (nonce == 0); 3867 } 3868 ifp->dad_nonce = nonce; 3869 ifp->dad_probes = idev->cnf.dad_transmits; 3870 addrconf_mod_dad_work(ifp, rand_num); 3871 } 3872 3873 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3874 { 3875 struct inet6_dev *idev = ifp->idev; 3876 struct net_device *dev = idev->dev; 3877 bool bump_id, notify = false; 3878 struct net *net; 3879 3880 addrconf_join_solict(dev, &ifp->addr); 3881 3882 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3883 3884 read_lock_bh(&idev->lock); 3885 spin_lock(&ifp->lock); 3886 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3887 goto out; 3888 3889 net = dev_net(dev); 3890 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3891 (net->ipv6.devconf_all->accept_dad < 1 && 3892 idev->cnf.accept_dad < 1) || 3893 !(ifp->flags&IFA_F_TENTATIVE) || 3894 ifp->flags & IFA_F_NODAD) { 3895 bool send_na = false; 3896 3897 if (ifp->flags & IFA_F_TENTATIVE && 3898 !(ifp->flags & IFA_F_OPTIMISTIC)) 3899 send_na = true; 3900 bump_id = ifp->flags & IFA_F_TENTATIVE; 3901 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3902 spin_unlock(&ifp->lock); 3903 read_unlock_bh(&idev->lock); 3904 3905 addrconf_dad_completed(ifp, bump_id, send_na); 3906 return; 3907 } 3908 3909 if (!(idev->if_flags & IF_READY)) { 3910 spin_unlock(&ifp->lock); 3911 read_unlock_bh(&idev->lock); 3912 /* 3913 * If the device is not ready: 3914 * - keep it tentative if it is a permanent address. 3915 * - otherwise, kill it. 3916 */ 3917 in6_ifa_hold(ifp); 3918 addrconf_dad_stop(ifp, 0); 3919 return; 3920 } 3921 3922 /* 3923 * Optimistic nodes can start receiving 3924 * Frames right away 3925 */ 3926 if (ifp->flags & IFA_F_OPTIMISTIC) { 3927 ip6_ins_rt(net, ifp->rt); 3928 if (ipv6_use_optimistic_addr(net, idev)) { 3929 /* Because optimistic nodes can use this address, 3930 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3931 */ 3932 notify = true; 3933 } 3934 } 3935 3936 addrconf_dad_kick(ifp); 3937 out: 3938 spin_unlock(&ifp->lock); 3939 read_unlock_bh(&idev->lock); 3940 if (notify) 3941 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3942 } 3943 3944 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3945 { 3946 bool begin_dad = false; 3947 3948 spin_lock_bh(&ifp->lock); 3949 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3950 ifp->state = INET6_IFADDR_STATE_PREDAD; 3951 begin_dad = true; 3952 } 3953 spin_unlock_bh(&ifp->lock); 3954 3955 if (begin_dad) 3956 addrconf_mod_dad_work(ifp, 0); 3957 } 3958 3959 static void addrconf_dad_work(struct work_struct *w) 3960 { 3961 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3962 struct inet6_ifaddr, 3963 dad_work); 3964 struct inet6_dev *idev = ifp->idev; 3965 bool bump_id, disable_ipv6 = false; 3966 struct in6_addr mcaddr; 3967 3968 enum { 3969 DAD_PROCESS, 3970 DAD_BEGIN, 3971 DAD_ABORT, 3972 } action = DAD_PROCESS; 3973 3974 rtnl_lock(); 3975 3976 spin_lock_bh(&ifp->lock); 3977 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3978 action = DAD_BEGIN; 3979 ifp->state = INET6_IFADDR_STATE_DAD; 3980 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3981 action = DAD_ABORT; 3982 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3983 3984 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3985 idev->cnf.accept_dad > 1) && 3986 !idev->cnf.disable_ipv6 && 3987 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3988 struct in6_addr addr; 3989 3990 addr.s6_addr32[0] = htonl(0xfe800000); 3991 addr.s6_addr32[1] = 0; 3992 3993 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3994 ipv6_addr_equal(&ifp->addr, &addr)) { 3995 /* DAD failed for link-local based on MAC */ 3996 idev->cnf.disable_ipv6 = 1; 3997 3998 pr_info("%s: IPv6 being disabled!\n", 3999 ifp->idev->dev->name); 4000 disable_ipv6 = true; 4001 } 4002 } 4003 } 4004 spin_unlock_bh(&ifp->lock); 4005 4006 if (action == DAD_BEGIN) { 4007 addrconf_dad_begin(ifp); 4008 goto out; 4009 } else if (action == DAD_ABORT) { 4010 in6_ifa_hold(ifp); 4011 addrconf_dad_stop(ifp, 1); 4012 if (disable_ipv6) 4013 addrconf_ifdown(idev->dev, 0); 4014 goto out; 4015 } 4016 4017 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4018 goto out; 4019 4020 write_lock_bh(&idev->lock); 4021 if (idev->dead || !(idev->if_flags & IF_READY)) { 4022 write_unlock_bh(&idev->lock); 4023 goto out; 4024 } 4025 4026 spin_lock(&ifp->lock); 4027 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4028 spin_unlock(&ifp->lock); 4029 write_unlock_bh(&idev->lock); 4030 goto out; 4031 } 4032 4033 if (ifp->dad_probes == 0) { 4034 bool send_na = false; 4035 4036 /* 4037 * DAD was successful 4038 */ 4039 4040 if (ifp->flags & IFA_F_TENTATIVE && 4041 !(ifp->flags & IFA_F_OPTIMISTIC)) 4042 send_na = true; 4043 bump_id = ifp->flags & IFA_F_TENTATIVE; 4044 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4045 spin_unlock(&ifp->lock); 4046 write_unlock_bh(&idev->lock); 4047 4048 addrconf_dad_completed(ifp, bump_id, send_na); 4049 4050 goto out; 4051 } 4052 4053 ifp->dad_probes--; 4054 addrconf_mod_dad_work(ifp, 4055 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4056 spin_unlock(&ifp->lock); 4057 write_unlock_bh(&idev->lock); 4058 4059 /* send a neighbour solicitation for our addr */ 4060 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4061 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4062 ifp->dad_nonce); 4063 out: 4064 in6_ifa_put(ifp); 4065 rtnl_unlock(); 4066 } 4067 4068 /* ifp->idev must be at least read locked */ 4069 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4070 { 4071 struct inet6_ifaddr *ifpiter; 4072 struct inet6_dev *idev = ifp->idev; 4073 4074 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4075 if (ifpiter->scope > IFA_LINK) 4076 break; 4077 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4078 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4079 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4080 IFA_F_PERMANENT) 4081 return false; 4082 } 4083 return true; 4084 } 4085 4086 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4087 bool send_na) 4088 { 4089 struct net_device *dev = ifp->idev->dev; 4090 struct in6_addr lladdr; 4091 bool send_rs, send_mld; 4092 4093 addrconf_del_dad_work(ifp); 4094 4095 /* 4096 * Configure the address for reception. Now it is valid. 4097 */ 4098 4099 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4100 4101 /* If added prefix is link local and we are prepared to process 4102 router advertisements, start sending router solicitations. 4103 */ 4104 4105 read_lock_bh(&ifp->idev->lock); 4106 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4107 send_rs = send_mld && 4108 ipv6_accept_ra(ifp->idev) && 4109 ifp->idev->cnf.rtr_solicits != 0 && 4110 (dev->flags&IFF_LOOPBACK) == 0; 4111 read_unlock_bh(&ifp->idev->lock); 4112 4113 /* While dad is in progress mld report's source address is in6_addrany. 4114 * Resend with proper ll now. 4115 */ 4116 if (send_mld) 4117 ipv6_mc_dad_complete(ifp->idev); 4118 4119 /* send unsolicited NA if enabled */ 4120 if (send_na && 4121 (ifp->idev->cnf.ndisc_notify || 4122 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4123 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4124 /*router=*/ !!ifp->idev->cnf.forwarding, 4125 /*solicited=*/ false, /*override=*/ true, 4126 /*inc_opt=*/ true); 4127 } 4128 4129 if (send_rs) { 4130 /* 4131 * If a host as already performed a random delay 4132 * [...] as part of DAD [...] there is no need 4133 * to delay again before sending the first RS 4134 */ 4135 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4136 return; 4137 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4138 4139 write_lock_bh(&ifp->idev->lock); 4140 spin_lock(&ifp->lock); 4141 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4142 ifp->idev->cnf.rtr_solicit_interval); 4143 ifp->idev->rs_probes = 1; 4144 ifp->idev->if_flags |= IF_RS_SENT; 4145 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4146 spin_unlock(&ifp->lock); 4147 write_unlock_bh(&ifp->idev->lock); 4148 } 4149 4150 if (bump_id) 4151 rt_genid_bump_ipv6(dev_net(dev)); 4152 4153 /* Make sure that a new temporary address will be created 4154 * before this temporary address becomes deprecated. 4155 */ 4156 if (ifp->flags & IFA_F_TEMPORARY) 4157 addrconf_verify_rtnl(); 4158 } 4159 4160 static void addrconf_dad_run(struct inet6_dev *idev) 4161 { 4162 struct inet6_ifaddr *ifp; 4163 4164 read_lock_bh(&idev->lock); 4165 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4166 spin_lock(&ifp->lock); 4167 if (ifp->flags & IFA_F_TENTATIVE && 4168 ifp->state == INET6_IFADDR_STATE_DAD) 4169 addrconf_dad_kick(ifp); 4170 spin_unlock(&ifp->lock); 4171 } 4172 read_unlock_bh(&idev->lock); 4173 } 4174 4175 #ifdef CONFIG_PROC_FS 4176 struct if6_iter_state { 4177 struct seq_net_private p; 4178 int bucket; 4179 int offset; 4180 }; 4181 4182 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4183 { 4184 struct if6_iter_state *state = seq->private; 4185 struct net *net = seq_file_net(seq); 4186 struct inet6_ifaddr *ifa = NULL; 4187 int p = 0; 4188 4189 /* initial bucket if pos is 0 */ 4190 if (pos == 0) { 4191 state->bucket = 0; 4192 state->offset = 0; 4193 } 4194 4195 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4196 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4197 addr_lst) { 4198 if (!net_eq(dev_net(ifa->idev->dev), net)) 4199 continue; 4200 /* sync with offset */ 4201 if (p < state->offset) { 4202 p++; 4203 continue; 4204 } 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 state->offset = 0; 4229 while (++state->bucket < IN6_ADDR_HSIZE) { 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 return ifa; 4235 } 4236 } 4237 4238 return NULL; 4239 } 4240 4241 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4242 __acquires(rcu) 4243 { 4244 rcu_read_lock(); 4245 return if6_get_first(seq, *pos); 4246 } 4247 4248 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4249 { 4250 struct inet6_ifaddr *ifa; 4251 4252 ifa = if6_get_next(seq, v); 4253 ++*pos; 4254 return ifa; 4255 } 4256 4257 static void if6_seq_stop(struct seq_file *seq, void *v) 4258 __releases(rcu) 4259 { 4260 rcu_read_unlock(); 4261 } 4262 4263 static int if6_seq_show(struct seq_file *seq, void *v) 4264 { 4265 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4266 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4267 &ifp->addr, 4268 ifp->idev->dev->ifindex, 4269 ifp->prefix_len, 4270 ifp->scope, 4271 (u8) ifp->flags, 4272 ifp->idev->dev->name); 4273 return 0; 4274 } 4275 4276 static const struct seq_operations if6_seq_ops = { 4277 .start = if6_seq_start, 4278 .next = if6_seq_next, 4279 .show = if6_seq_show, 4280 .stop = if6_seq_stop, 4281 }; 4282 4283 static int __net_init if6_proc_net_init(struct net *net) 4284 { 4285 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4286 sizeof(struct if6_iter_state))) 4287 return -ENOMEM; 4288 return 0; 4289 } 4290 4291 static void __net_exit if6_proc_net_exit(struct net *net) 4292 { 4293 remove_proc_entry("if_inet6", net->proc_net); 4294 } 4295 4296 static struct pernet_operations if6_proc_net_ops = { 4297 .init = if6_proc_net_init, 4298 .exit = if6_proc_net_exit, 4299 }; 4300 4301 int __init if6_proc_init(void) 4302 { 4303 return register_pernet_subsys(&if6_proc_net_ops); 4304 } 4305 4306 void if6_proc_exit(void) 4307 { 4308 unregister_pernet_subsys(&if6_proc_net_ops); 4309 } 4310 #endif /* CONFIG_PROC_FS */ 4311 4312 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4313 /* Check if address is a home address configured on any interface. */ 4314 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4315 { 4316 unsigned int hash = inet6_addr_hash(net, addr); 4317 struct inet6_ifaddr *ifp = NULL; 4318 int ret = 0; 4319 4320 rcu_read_lock(); 4321 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4322 if (!net_eq(dev_net(ifp->idev->dev), net)) 4323 continue; 4324 if (ipv6_addr_equal(&ifp->addr, addr) && 4325 (ifp->flags & IFA_F_HOMEADDRESS)) { 4326 ret = 1; 4327 break; 4328 } 4329 } 4330 rcu_read_unlock(); 4331 return ret; 4332 } 4333 #endif 4334 4335 /* 4336 * Periodic address status verification 4337 */ 4338 4339 static void addrconf_verify_rtnl(void) 4340 { 4341 unsigned long now, next, next_sec, next_sched; 4342 struct inet6_ifaddr *ifp; 4343 int i; 4344 4345 ASSERT_RTNL(); 4346 4347 rcu_read_lock_bh(); 4348 now = jiffies; 4349 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4350 4351 cancel_delayed_work(&addr_chk_work); 4352 4353 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4354 restart: 4355 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4356 unsigned long age; 4357 4358 /* When setting preferred_lft to a value not zero or 4359 * infinity, while valid_lft is infinity 4360 * IFA_F_PERMANENT has a non-infinity life time. 4361 */ 4362 if ((ifp->flags & IFA_F_PERMANENT) && 4363 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4364 continue; 4365 4366 spin_lock(&ifp->lock); 4367 /* We try to batch several events at once. */ 4368 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4369 4370 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4371 age >= ifp->valid_lft) { 4372 spin_unlock(&ifp->lock); 4373 in6_ifa_hold(ifp); 4374 ipv6_del_addr(ifp); 4375 goto restart; 4376 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4377 spin_unlock(&ifp->lock); 4378 continue; 4379 } else if (age >= ifp->prefered_lft) { 4380 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4381 int deprecate = 0; 4382 4383 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4384 deprecate = 1; 4385 ifp->flags |= IFA_F_DEPRECATED; 4386 } 4387 4388 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4389 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4390 next = ifp->tstamp + ifp->valid_lft * HZ; 4391 4392 spin_unlock(&ifp->lock); 4393 4394 if (deprecate) { 4395 in6_ifa_hold(ifp); 4396 4397 ipv6_ifa_notify(0, ifp); 4398 in6_ifa_put(ifp); 4399 goto restart; 4400 } 4401 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4402 !(ifp->flags&IFA_F_TENTATIVE)) { 4403 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4404 ifp->idev->cnf.dad_transmits * 4405 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4406 4407 if (age >= ifp->prefered_lft - regen_advance) { 4408 struct inet6_ifaddr *ifpub = ifp->ifpub; 4409 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4410 next = ifp->tstamp + ifp->prefered_lft * HZ; 4411 if (!ifp->regen_count && ifpub) { 4412 ifp->regen_count++; 4413 in6_ifa_hold(ifp); 4414 in6_ifa_hold(ifpub); 4415 spin_unlock(&ifp->lock); 4416 4417 spin_lock(&ifpub->lock); 4418 ifpub->regen_count = 0; 4419 spin_unlock(&ifpub->lock); 4420 rcu_read_unlock_bh(); 4421 ipv6_create_tempaddr(ifpub, ifp, true); 4422 in6_ifa_put(ifpub); 4423 in6_ifa_put(ifp); 4424 rcu_read_lock_bh(); 4425 goto restart; 4426 } 4427 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4428 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4429 spin_unlock(&ifp->lock); 4430 } else { 4431 /* ifp->prefered_lft <= ifp->valid_lft */ 4432 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4433 next = ifp->tstamp + ifp->prefered_lft * HZ; 4434 spin_unlock(&ifp->lock); 4435 } 4436 } 4437 } 4438 4439 next_sec = round_jiffies_up(next); 4440 next_sched = next; 4441 4442 /* If rounded timeout is accurate enough, accept it. */ 4443 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4444 next_sched = next_sec; 4445 4446 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4447 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4448 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4449 4450 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4451 now, next, next_sec, next_sched); 4452 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4453 rcu_read_unlock_bh(); 4454 } 4455 4456 static void addrconf_verify_work(struct work_struct *w) 4457 { 4458 rtnl_lock(); 4459 addrconf_verify_rtnl(); 4460 rtnl_unlock(); 4461 } 4462 4463 static void addrconf_verify(void) 4464 { 4465 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4466 } 4467 4468 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4469 struct in6_addr **peer_pfx) 4470 { 4471 struct in6_addr *pfx = NULL; 4472 4473 *peer_pfx = NULL; 4474 4475 if (addr) 4476 pfx = nla_data(addr); 4477 4478 if (local) { 4479 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4480 *peer_pfx = pfx; 4481 pfx = nla_data(local); 4482 } 4483 4484 return pfx; 4485 } 4486 4487 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4488 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4489 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4490 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4491 [IFA_FLAGS] = { .len = sizeof(u32) }, 4492 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4493 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 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 struct inet6_fill_args { 4797 u32 portid; 4798 u32 seq; 4799 int event; 4800 unsigned int flags; 4801 int netnsid; 4802 }; 4803 4804 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4805 struct inet6_fill_args *args) 4806 { 4807 struct nlmsghdr *nlh; 4808 u32 preferred, valid; 4809 4810 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4811 sizeof(struct ifaddrmsg), args->flags); 4812 if (!nlh) 4813 return -EMSGSIZE; 4814 4815 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4816 ifa->idev->dev->ifindex); 4817 4818 if (args->netnsid >= 0 && 4819 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4820 goto error; 4821 4822 if (!((ifa->flags&IFA_F_PERMANENT) && 4823 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4824 preferred = ifa->prefered_lft; 4825 valid = ifa->valid_lft; 4826 if (preferred != INFINITY_LIFE_TIME) { 4827 long tval = (jiffies - ifa->tstamp)/HZ; 4828 if (preferred > tval) 4829 preferred -= tval; 4830 else 4831 preferred = 0; 4832 if (valid != INFINITY_LIFE_TIME) { 4833 if (valid > tval) 4834 valid -= tval; 4835 else 4836 valid = 0; 4837 } 4838 } 4839 } else { 4840 preferred = INFINITY_LIFE_TIME; 4841 valid = INFINITY_LIFE_TIME; 4842 } 4843 4844 if (!ipv6_addr_any(&ifa->peer_addr)) { 4845 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4846 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4847 goto error; 4848 } else 4849 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4850 goto error; 4851 4852 if (ifa->rt_priority && 4853 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 4854 goto error; 4855 4856 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4857 goto error; 4858 4859 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4860 goto error; 4861 4862 nlmsg_end(skb, nlh); 4863 return 0; 4864 4865 error: 4866 nlmsg_cancel(skb, nlh); 4867 return -EMSGSIZE; 4868 } 4869 4870 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4871 struct inet6_fill_args *args) 4872 { 4873 struct nlmsghdr *nlh; 4874 u8 scope = RT_SCOPE_UNIVERSE; 4875 int ifindex = ifmca->idev->dev->ifindex; 4876 4877 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4878 scope = RT_SCOPE_SITE; 4879 4880 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4881 sizeof(struct ifaddrmsg), args->flags); 4882 if (!nlh) 4883 return -EMSGSIZE; 4884 4885 if (args->netnsid >= 0 && 4886 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4887 return -EMSGSIZE; 4888 4889 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4890 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4891 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4892 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4893 nlmsg_cancel(skb, nlh); 4894 return -EMSGSIZE; 4895 } 4896 4897 nlmsg_end(skb, nlh); 4898 return 0; 4899 } 4900 4901 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4902 struct inet6_fill_args *args) 4903 { 4904 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 4905 int ifindex = dev ? dev->ifindex : 1; 4906 struct nlmsghdr *nlh; 4907 u8 scope = RT_SCOPE_UNIVERSE; 4908 4909 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4910 scope = RT_SCOPE_SITE; 4911 4912 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4913 sizeof(struct ifaddrmsg), args->flags); 4914 if (!nlh) 4915 return -EMSGSIZE; 4916 4917 if (args->netnsid >= 0 && 4918 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4919 return -EMSGSIZE; 4920 4921 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4922 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4923 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4924 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4925 nlmsg_cancel(skb, nlh); 4926 return -EMSGSIZE; 4927 } 4928 4929 nlmsg_end(skb, nlh); 4930 return 0; 4931 } 4932 4933 enum addr_type_t { 4934 UNICAST_ADDR, 4935 MULTICAST_ADDR, 4936 ANYCAST_ADDR, 4937 }; 4938 4939 /* called with rcu_read_lock() */ 4940 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4941 struct netlink_callback *cb, enum addr_type_t type, 4942 int s_ip_idx, int *p_ip_idx, int netnsid) 4943 { 4944 struct inet6_fill_args fillargs = { 4945 .portid = NETLINK_CB(cb->skb).portid, 4946 .seq = cb->nlh->nlmsg_seq, 4947 .flags = NLM_F_MULTI, 4948 .netnsid = netnsid, 4949 }; 4950 struct ifmcaddr6 *ifmca; 4951 struct ifacaddr6 *ifaca; 4952 int err = 1; 4953 int ip_idx = *p_ip_idx; 4954 4955 read_lock_bh(&idev->lock); 4956 switch (type) { 4957 case UNICAST_ADDR: { 4958 struct inet6_ifaddr *ifa; 4959 fillargs.event = RTM_NEWADDR; 4960 4961 /* unicast address incl. temp addr */ 4962 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4963 if (++ip_idx < s_ip_idx) 4964 continue; 4965 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 4966 if (err < 0) 4967 break; 4968 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4969 } 4970 break; 4971 } 4972 case MULTICAST_ADDR: 4973 fillargs.event = RTM_GETMULTICAST; 4974 4975 /* multicast address */ 4976 for (ifmca = idev->mc_list; ifmca; 4977 ifmca = ifmca->next, ip_idx++) { 4978 if (ip_idx < s_ip_idx) 4979 continue; 4980 err = inet6_fill_ifmcaddr(skb, ifmca, &fillargs); 4981 if (err < 0) 4982 break; 4983 } 4984 break; 4985 case ANYCAST_ADDR: 4986 fillargs.event = RTM_GETANYCAST; 4987 /* anycast address */ 4988 for (ifaca = idev->ac_list; ifaca; 4989 ifaca = ifaca->aca_next, ip_idx++) { 4990 if (ip_idx < s_ip_idx) 4991 continue; 4992 err = inet6_fill_ifacaddr(skb, ifaca, &fillargs); 4993 if (err < 0) 4994 break; 4995 } 4996 break; 4997 default: 4998 break; 4999 } 5000 read_unlock_bh(&idev->lock); 5001 *p_ip_idx = ip_idx; 5002 return err; 5003 } 5004 5005 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5006 enum addr_type_t type) 5007 { 5008 struct net *net = sock_net(skb->sk); 5009 struct nlattr *tb[IFA_MAX+1]; 5010 struct net *tgt_net = net; 5011 int netnsid = -1; 5012 int h, s_h; 5013 int idx, ip_idx; 5014 int s_idx, s_ip_idx; 5015 struct net_device *dev; 5016 struct inet6_dev *idev; 5017 struct hlist_head *head; 5018 5019 s_h = cb->args[0]; 5020 s_idx = idx = cb->args[1]; 5021 s_ip_idx = ip_idx = cb->args[2]; 5022 5023 if (nlmsg_parse(cb->nlh, sizeof(struct ifaddrmsg), tb, IFA_MAX, 5024 ifa_ipv6_policy, NULL) >= 0) { 5025 if (tb[IFA_TARGET_NETNSID]) { 5026 netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5027 5028 tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); 5029 if (IS_ERR(tgt_net)) 5030 return PTR_ERR(tgt_net); 5031 } 5032 } 5033 5034 rcu_read_lock(); 5035 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5036 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5037 idx = 0; 5038 head = &tgt_net->dev_index_head[h]; 5039 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5040 if (idx < s_idx) 5041 goto cont; 5042 if (h > s_h || idx > s_idx) 5043 s_ip_idx = 0; 5044 ip_idx = 0; 5045 idev = __in6_dev_get(dev); 5046 if (!idev) 5047 goto cont; 5048 5049 if (in6_dump_addrs(idev, skb, cb, type, 5050 s_ip_idx, &ip_idx, netnsid) < 0) 5051 goto done; 5052 cont: 5053 idx++; 5054 } 5055 } 5056 done: 5057 rcu_read_unlock(); 5058 cb->args[0] = h; 5059 cb->args[1] = idx; 5060 cb->args[2] = ip_idx; 5061 if (netnsid >= 0) 5062 put_net(tgt_net); 5063 5064 return skb->len; 5065 } 5066 5067 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5068 { 5069 enum addr_type_t type = UNICAST_ADDR; 5070 5071 return inet6_dump_addr(skb, cb, type); 5072 } 5073 5074 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5075 { 5076 enum addr_type_t type = MULTICAST_ADDR; 5077 5078 return inet6_dump_addr(skb, cb, type); 5079 } 5080 5081 5082 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5083 { 5084 enum addr_type_t type = ANYCAST_ADDR; 5085 5086 return inet6_dump_addr(skb, cb, type); 5087 } 5088 5089 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5090 struct netlink_ext_ack *extack) 5091 { 5092 struct net *net = sock_net(in_skb->sk); 5093 struct inet6_fill_args fillargs = { 5094 .portid = NETLINK_CB(in_skb).portid, 5095 .seq = nlh->nlmsg_seq, 5096 .event = RTM_NEWADDR, 5097 .flags = 0, 5098 .netnsid = -1, 5099 }; 5100 struct net *tgt_net = net; 5101 struct ifaddrmsg *ifm; 5102 struct nlattr *tb[IFA_MAX+1]; 5103 struct in6_addr *addr = NULL, *peer; 5104 struct net_device *dev = NULL; 5105 struct inet6_ifaddr *ifa; 5106 struct sk_buff *skb; 5107 int err; 5108 5109 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 5110 extack); 5111 if (err < 0) 5112 return err; 5113 5114 if (tb[IFA_TARGET_NETNSID]) { 5115 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5116 5117 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5118 fillargs.netnsid); 5119 if (IS_ERR(tgt_net)) 5120 return PTR_ERR(tgt_net); 5121 } 5122 5123 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5124 if (!addr) 5125 return -EINVAL; 5126 5127 ifm = nlmsg_data(nlh); 5128 if (ifm->ifa_index) 5129 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5130 5131 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5132 if (!ifa) { 5133 err = -EADDRNOTAVAIL; 5134 goto errout; 5135 } 5136 5137 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5138 if (!skb) { 5139 err = -ENOBUFS; 5140 goto errout_ifa; 5141 } 5142 5143 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5144 if (err < 0) { 5145 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5146 WARN_ON(err == -EMSGSIZE); 5147 kfree_skb(skb); 5148 goto errout_ifa; 5149 } 5150 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5151 errout_ifa: 5152 in6_ifa_put(ifa); 5153 errout: 5154 if (dev) 5155 dev_put(dev); 5156 if (fillargs.netnsid >= 0) 5157 put_net(tgt_net); 5158 5159 return err; 5160 } 5161 5162 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5163 { 5164 struct sk_buff *skb; 5165 struct net *net = dev_net(ifa->idev->dev); 5166 struct inet6_fill_args fillargs = { 5167 .portid = 0, 5168 .seq = 0, 5169 .event = event, 5170 .flags = 0, 5171 .netnsid = -1, 5172 }; 5173 int err = -ENOBUFS; 5174 5175 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5176 if (!skb) 5177 goto errout; 5178 5179 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5180 if (err < 0) { 5181 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5182 WARN_ON(err == -EMSGSIZE); 5183 kfree_skb(skb); 5184 goto errout; 5185 } 5186 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5187 return; 5188 errout: 5189 if (err < 0) 5190 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5191 } 5192 5193 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5194 __s32 *array, int bytes) 5195 { 5196 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5197 5198 memset(array, 0, bytes); 5199 array[DEVCONF_FORWARDING] = cnf->forwarding; 5200 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5201 array[DEVCONF_MTU6] = cnf->mtu6; 5202 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5203 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5204 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5205 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5206 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5207 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5208 jiffies_to_msecs(cnf->rtr_solicit_interval); 5209 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5210 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5211 array[DEVCONF_RTR_SOLICIT_DELAY] = 5212 jiffies_to_msecs(cnf->rtr_solicit_delay); 5213 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5214 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5215 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5216 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5217 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5218 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5219 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5220 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5221 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5222 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5223 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5224 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5225 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5226 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5227 #ifdef CONFIG_IPV6_ROUTER_PREF 5228 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5229 array[DEVCONF_RTR_PROBE_INTERVAL] = 5230 jiffies_to_msecs(cnf->rtr_probe_interval); 5231 #ifdef CONFIG_IPV6_ROUTE_INFO 5232 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5233 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5234 #endif 5235 #endif 5236 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5237 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5238 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5239 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5240 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5241 #endif 5242 #ifdef CONFIG_IPV6_MROUTE 5243 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5244 #endif 5245 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5246 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5247 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5248 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5249 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5250 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5251 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5252 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5253 /* we omit DEVCONF_STABLE_SECRET for now */ 5254 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5255 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5256 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5257 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5258 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5259 #ifdef CONFIG_IPV6_SEG6_HMAC 5260 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5261 #endif 5262 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5263 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5264 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5265 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5266 } 5267 5268 static inline size_t inet6_ifla6_size(void) 5269 { 5270 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5271 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5272 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5273 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5274 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5275 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5276 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5277 + 0; 5278 } 5279 5280 static inline size_t inet6_if_nlmsg_size(void) 5281 { 5282 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5283 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5284 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5285 + nla_total_size(4) /* IFLA_MTU */ 5286 + nla_total_size(4) /* IFLA_LINK */ 5287 + nla_total_size(1) /* IFLA_OPERSTATE */ 5288 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5289 } 5290 5291 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5292 int bytes) 5293 { 5294 int i; 5295 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5296 BUG_ON(pad < 0); 5297 5298 /* Use put_unaligned() because stats may not be aligned for u64. */ 5299 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5300 for (i = 1; i < ICMP6_MIB_MAX; i++) 5301 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5302 5303 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5304 } 5305 5306 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5307 int bytes, size_t syncpoff) 5308 { 5309 int i, c; 5310 u64 buff[IPSTATS_MIB_MAX]; 5311 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5312 5313 BUG_ON(pad < 0); 5314 5315 memset(buff, 0, sizeof(buff)); 5316 buff[0] = IPSTATS_MIB_MAX; 5317 5318 for_each_possible_cpu(c) { 5319 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5320 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5321 } 5322 5323 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5324 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5325 } 5326 5327 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5328 int bytes) 5329 { 5330 switch (attrtype) { 5331 case IFLA_INET6_STATS: 5332 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5333 offsetof(struct ipstats_mib, syncp)); 5334 break; 5335 case IFLA_INET6_ICMP6STATS: 5336 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5337 break; 5338 } 5339 } 5340 5341 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5342 u32 ext_filter_mask) 5343 { 5344 struct nlattr *nla; 5345 struct ifla_cacheinfo ci; 5346 5347 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5348 goto nla_put_failure; 5349 ci.max_reasm_len = IPV6_MAXPLEN; 5350 ci.tstamp = cstamp_delta(idev->tstamp); 5351 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5352 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5353 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5354 goto nla_put_failure; 5355 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5356 if (!nla) 5357 goto nla_put_failure; 5358 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5359 5360 /* XXX - MC not implemented */ 5361 5362 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5363 return 0; 5364 5365 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5366 if (!nla) 5367 goto nla_put_failure; 5368 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5369 5370 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5371 if (!nla) 5372 goto nla_put_failure; 5373 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5374 5375 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5376 if (!nla) 5377 goto nla_put_failure; 5378 5379 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5380 goto nla_put_failure; 5381 5382 read_lock_bh(&idev->lock); 5383 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5384 read_unlock_bh(&idev->lock); 5385 5386 return 0; 5387 5388 nla_put_failure: 5389 return -EMSGSIZE; 5390 } 5391 5392 static size_t inet6_get_link_af_size(const struct net_device *dev, 5393 u32 ext_filter_mask) 5394 { 5395 if (!__in6_dev_get(dev)) 5396 return 0; 5397 5398 return inet6_ifla6_size(); 5399 } 5400 5401 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5402 u32 ext_filter_mask) 5403 { 5404 struct inet6_dev *idev = __in6_dev_get(dev); 5405 5406 if (!idev) 5407 return -ENODATA; 5408 5409 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5410 return -EMSGSIZE; 5411 5412 return 0; 5413 } 5414 5415 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5416 { 5417 struct inet6_ifaddr *ifp; 5418 struct net_device *dev = idev->dev; 5419 bool clear_token, update_rs = false; 5420 struct in6_addr ll_addr; 5421 5422 ASSERT_RTNL(); 5423 5424 if (!token) 5425 return -EINVAL; 5426 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5427 return -EINVAL; 5428 if (!ipv6_accept_ra(idev)) 5429 return -EINVAL; 5430 if (idev->cnf.rtr_solicits == 0) 5431 return -EINVAL; 5432 5433 write_lock_bh(&idev->lock); 5434 5435 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5436 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5437 5438 write_unlock_bh(&idev->lock); 5439 5440 clear_token = ipv6_addr_any(token); 5441 if (clear_token) 5442 goto update_lft; 5443 5444 if (!idev->dead && (idev->if_flags & IF_READY) && 5445 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5446 IFA_F_OPTIMISTIC)) { 5447 /* If we're not ready, then normal ifup will take care 5448 * of this. Otherwise, we need to request our rs here. 5449 */ 5450 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5451 update_rs = true; 5452 } 5453 5454 update_lft: 5455 write_lock_bh(&idev->lock); 5456 5457 if (update_rs) { 5458 idev->if_flags |= IF_RS_SENT; 5459 idev->rs_interval = rfc3315_s14_backoff_init( 5460 idev->cnf.rtr_solicit_interval); 5461 idev->rs_probes = 1; 5462 addrconf_mod_rs_timer(idev, idev->rs_interval); 5463 } 5464 5465 /* Well, that's kinda nasty ... */ 5466 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5467 spin_lock(&ifp->lock); 5468 if (ifp->tokenized) { 5469 ifp->valid_lft = 0; 5470 ifp->prefered_lft = 0; 5471 } 5472 spin_unlock(&ifp->lock); 5473 } 5474 5475 write_unlock_bh(&idev->lock); 5476 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5477 addrconf_verify_rtnl(); 5478 return 0; 5479 } 5480 5481 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5482 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5483 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5484 }; 5485 5486 static int inet6_validate_link_af(const struct net_device *dev, 5487 const struct nlattr *nla) 5488 { 5489 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5490 5491 if (dev && !__in6_dev_get(dev)) 5492 return -EAFNOSUPPORT; 5493 5494 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5495 NULL); 5496 } 5497 5498 static int check_addr_gen_mode(int mode) 5499 { 5500 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5501 mode != IN6_ADDR_GEN_MODE_NONE && 5502 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5503 mode != IN6_ADDR_GEN_MODE_RANDOM) 5504 return -EINVAL; 5505 return 1; 5506 } 5507 5508 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5509 int mode) 5510 { 5511 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5512 !idev->cnf.stable_secret.initialized && 5513 !net->ipv6.devconf_dflt->stable_secret.initialized) 5514 return -EINVAL; 5515 return 1; 5516 } 5517 5518 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5519 { 5520 int err = -EINVAL; 5521 struct inet6_dev *idev = __in6_dev_get(dev); 5522 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5523 5524 if (!idev) 5525 return -EAFNOSUPPORT; 5526 5527 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5528 BUG(); 5529 5530 if (tb[IFLA_INET6_TOKEN]) { 5531 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5532 if (err) 5533 return err; 5534 } 5535 5536 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5537 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5538 5539 if (check_addr_gen_mode(mode) < 0 || 5540 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5541 return -EINVAL; 5542 5543 idev->cnf.addr_gen_mode = mode; 5544 err = 0; 5545 } 5546 5547 return err; 5548 } 5549 5550 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5551 u32 portid, u32 seq, int event, unsigned int flags) 5552 { 5553 struct net_device *dev = idev->dev; 5554 struct ifinfomsg *hdr; 5555 struct nlmsghdr *nlh; 5556 void *protoinfo; 5557 5558 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5559 if (!nlh) 5560 return -EMSGSIZE; 5561 5562 hdr = nlmsg_data(nlh); 5563 hdr->ifi_family = AF_INET6; 5564 hdr->__ifi_pad = 0; 5565 hdr->ifi_type = dev->type; 5566 hdr->ifi_index = dev->ifindex; 5567 hdr->ifi_flags = dev_get_flags(dev); 5568 hdr->ifi_change = 0; 5569 5570 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5571 (dev->addr_len && 5572 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5573 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5574 (dev->ifindex != dev_get_iflink(dev) && 5575 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5576 nla_put_u8(skb, IFLA_OPERSTATE, 5577 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5578 goto nla_put_failure; 5579 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5580 if (!protoinfo) 5581 goto nla_put_failure; 5582 5583 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5584 goto nla_put_failure; 5585 5586 nla_nest_end(skb, protoinfo); 5587 nlmsg_end(skb, nlh); 5588 return 0; 5589 5590 nla_put_failure: 5591 nlmsg_cancel(skb, nlh); 5592 return -EMSGSIZE; 5593 } 5594 5595 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5596 { 5597 struct net *net = sock_net(skb->sk); 5598 int h, s_h; 5599 int idx = 0, s_idx; 5600 struct net_device *dev; 5601 struct inet6_dev *idev; 5602 struct hlist_head *head; 5603 5604 s_h = cb->args[0]; 5605 s_idx = cb->args[1]; 5606 5607 rcu_read_lock(); 5608 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5609 idx = 0; 5610 head = &net->dev_index_head[h]; 5611 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5612 if (idx < s_idx) 5613 goto cont; 5614 idev = __in6_dev_get(dev); 5615 if (!idev) 5616 goto cont; 5617 if (inet6_fill_ifinfo(skb, idev, 5618 NETLINK_CB(cb->skb).portid, 5619 cb->nlh->nlmsg_seq, 5620 RTM_NEWLINK, NLM_F_MULTI) < 0) 5621 goto out; 5622 cont: 5623 idx++; 5624 } 5625 } 5626 out: 5627 rcu_read_unlock(); 5628 cb->args[1] = idx; 5629 cb->args[0] = h; 5630 5631 return skb->len; 5632 } 5633 5634 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5635 { 5636 struct sk_buff *skb; 5637 struct net *net = dev_net(idev->dev); 5638 int err = -ENOBUFS; 5639 5640 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5641 if (!skb) 5642 goto errout; 5643 5644 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5645 if (err < 0) { 5646 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5647 WARN_ON(err == -EMSGSIZE); 5648 kfree_skb(skb); 5649 goto errout; 5650 } 5651 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5652 return; 5653 errout: 5654 if (err < 0) 5655 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5656 } 5657 5658 static inline size_t inet6_prefix_nlmsg_size(void) 5659 { 5660 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5661 + nla_total_size(sizeof(struct in6_addr)) 5662 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5663 } 5664 5665 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5666 struct prefix_info *pinfo, u32 portid, u32 seq, 5667 int event, unsigned int flags) 5668 { 5669 struct prefixmsg *pmsg; 5670 struct nlmsghdr *nlh; 5671 struct prefix_cacheinfo ci; 5672 5673 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5674 if (!nlh) 5675 return -EMSGSIZE; 5676 5677 pmsg = nlmsg_data(nlh); 5678 pmsg->prefix_family = AF_INET6; 5679 pmsg->prefix_pad1 = 0; 5680 pmsg->prefix_pad2 = 0; 5681 pmsg->prefix_ifindex = idev->dev->ifindex; 5682 pmsg->prefix_len = pinfo->prefix_len; 5683 pmsg->prefix_type = pinfo->type; 5684 pmsg->prefix_pad3 = 0; 5685 pmsg->prefix_flags = 0; 5686 if (pinfo->onlink) 5687 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5688 if (pinfo->autoconf) 5689 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5690 5691 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5692 goto nla_put_failure; 5693 ci.preferred_time = ntohl(pinfo->prefered); 5694 ci.valid_time = ntohl(pinfo->valid); 5695 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5696 goto nla_put_failure; 5697 nlmsg_end(skb, nlh); 5698 return 0; 5699 5700 nla_put_failure: 5701 nlmsg_cancel(skb, nlh); 5702 return -EMSGSIZE; 5703 } 5704 5705 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5706 struct prefix_info *pinfo) 5707 { 5708 struct sk_buff *skb; 5709 struct net *net = dev_net(idev->dev); 5710 int err = -ENOBUFS; 5711 5712 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5713 if (!skb) 5714 goto errout; 5715 5716 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5717 if (err < 0) { 5718 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5719 WARN_ON(err == -EMSGSIZE); 5720 kfree_skb(skb); 5721 goto errout; 5722 } 5723 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5724 return; 5725 errout: 5726 if (err < 0) 5727 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5728 } 5729 5730 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5731 { 5732 struct net *net = dev_net(ifp->idev->dev); 5733 5734 if (event) 5735 ASSERT_RTNL(); 5736 5737 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5738 5739 switch (event) { 5740 case RTM_NEWADDR: 5741 /* 5742 * If the address was optimistic 5743 * we inserted the route at the start of 5744 * our DAD process, so we don't need 5745 * to do it again 5746 */ 5747 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5748 ip6_ins_rt(net, ifp->rt); 5749 if (ifp->idev->cnf.forwarding) 5750 addrconf_join_anycast(ifp); 5751 if (!ipv6_addr_any(&ifp->peer_addr)) 5752 addrconf_prefix_route(&ifp->peer_addr, 128, 0, 5753 ifp->idev->dev, 0, 0, 5754 GFP_ATOMIC); 5755 break; 5756 case RTM_DELADDR: 5757 if (ifp->idev->cnf.forwarding) 5758 addrconf_leave_anycast(ifp); 5759 addrconf_leave_solict(ifp->idev, &ifp->addr); 5760 if (!ipv6_addr_any(&ifp->peer_addr)) { 5761 struct fib6_info *rt; 5762 5763 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5764 ifp->idev->dev, 0, 0); 5765 if (rt) 5766 ip6_del_rt(net, rt); 5767 } 5768 if (ifp->rt) { 5769 ip6_del_rt(net, ifp->rt); 5770 ifp->rt = NULL; 5771 } 5772 rt_genid_bump_ipv6(net); 5773 break; 5774 } 5775 atomic_inc(&net->ipv6.dev_addr_genid); 5776 } 5777 5778 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5779 { 5780 rcu_read_lock_bh(); 5781 if (likely(ifp->idev->dead == 0)) 5782 __ipv6_ifa_notify(event, ifp); 5783 rcu_read_unlock_bh(); 5784 } 5785 5786 #ifdef CONFIG_SYSCTL 5787 5788 static 5789 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5790 void __user *buffer, size_t *lenp, loff_t *ppos) 5791 { 5792 int *valp = ctl->data; 5793 int val = *valp; 5794 loff_t pos = *ppos; 5795 struct ctl_table lctl; 5796 int ret; 5797 5798 /* 5799 * ctl->data points to idev->cnf.forwarding, we should 5800 * not modify it until we get the rtnl lock. 5801 */ 5802 lctl = *ctl; 5803 lctl.data = &val; 5804 5805 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5806 5807 if (write) 5808 ret = addrconf_fixup_forwarding(ctl, valp, val); 5809 if (ret) 5810 *ppos = pos; 5811 return ret; 5812 } 5813 5814 static 5815 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5816 void __user *buffer, size_t *lenp, loff_t *ppos) 5817 { 5818 struct inet6_dev *idev = ctl->extra1; 5819 int min_mtu = IPV6_MIN_MTU; 5820 struct ctl_table lctl; 5821 5822 lctl = *ctl; 5823 lctl.extra1 = &min_mtu; 5824 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5825 5826 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5827 } 5828 5829 static void dev_disable_change(struct inet6_dev *idev) 5830 { 5831 struct netdev_notifier_info info; 5832 5833 if (!idev || !idev->dev) 5834 return; 5835 5836 netdev_notifier_info_init(&info, idev->dev); 5837 if (idev->cnf.disable_ipv6) 5838 addrconf_notify(NULL, NETDEV_DOWN, &info); 5839 else 5840 addrconf_notify(NULL, NETDEV_UP, &info); 5841 } 5842 5843 static void addrconf_disable_change(struct net *net, __s32 newf) 5844 { 5845 struct net_device *dev; 5846 struct inet6_dev *idev; 5847 5848 for_each_netdev(net, dev) { 5849 idev = __in6_dev_get(dev); 5850 if (idev) { 5851 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5852 idev->cnf.disable_ipv6 = newf; 5853 if (changed) 5854 dev_disable_change(idev); 5855 } 5856 } 5857 } 5858 5859 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5860 { 5861 struct net *net; 5862 int old; 5863 5864 if (!rtnl_trylock()) 5865 return restart_syscall(); 5866 5867 net = (struct net *)table->extra2; 5868 old = *p; 5869 *p = newf; 5870 5871 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5872 rtnl_unlock(); 5873 return 0; 5874 } 5875 5876 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5877 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5878 addrconf_disable_change(net, newf); 5879 } else if ((!newf) ^ (!old)) 5880 dev_disable_change((struct inet6_dev *)table->extra1); 5881 5882 rtnl_unlock(); 5883 return 0; 5884 } 5885 5886 static 5887 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5888 void __user *buffer, size_t *lenp, loff_t *ppos) 5889 { 5890 int *valp = ctl->data; 5891 int val = *valp; 5892 loff_t pos = *ppos; 5893 struct ctl_table lctl; 5894 int ret; 5895 5896 /* 5897 * ctl->data points to idev->cnf.disable_ipv6, we should 5898 * not modify it until we get the rtnl lock. 5899 */ 5900 lctl = *ctl; 5901 lctl.data = &val; 5902 5903 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5904 5905 if (write) 5906 ret = addrconf_disable_ipv6(ctl, valp, val); 5907 if (ret) 5908 *ppos = pos; 5909 return ret; 5910 } 5911 5912 static 5913 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5914 void __user *buffer, size_t *lenp, loff_t *ppos) 5915 { 5916 int *valp = ctl->data; 5917 int ret; 5918 int old, new; 5919 5920 old = *valp; 5921 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5922 new = *valp; 5923 5924 if (write && old != new) { 5925 struct net *net = ctl->extra2; 5926 5927 if (!rtnl_trylock()) 5928 return restart_syscall(); 5929 5930 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5931 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5932 NETCONFA_PROXY_NEIGH, 5933 NETCONFA_IFINDEX_DEFAULT, 5934 net->ipv6.devconf_dflt); 5935 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5936 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5937 NETCONFA_PROXY_NEIGH, 5938 NETCONFA_IFINDEX_ALL, 5939 net->ipv6.devconf_all); 5940 else { 5941 struct inet6_dev *idev = ctl->extra1; 5942 5943 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5944 NETCONFA_PROXY_NEIGH, 5945 idev->dev->ifindex, 5946 &idev->cnf); 5947 } 5948 rtnl_unlock(); 5949 } 5950 5951 return ret; 5952 } 5953 5954 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5955 void __user *buffer, size_t *lenp, 5956 loff_t *ppos) 5957 { 5958 int ret = 0; 5959 u32 new_val; 5960 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5961 struct net *net = (struct net *)ctl->extra2; 5962 struct ctl_table tmp = { 5963 .data = &new_val, 5964 .maxlen = sizeof(new_val), 5965 .mode = ctl->mode, 5966 }; 5967 5968 if (!rtnl_trylock()) 5969 return restart_syscall(); 5970 5971 new_val = *((u32 *)ctl->data); 5972 5973 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 5974 if (ret != 0) 5975 goto out; 5976 5977 if (write) { 5978 if (check_addr_gen_mode(new_val) < 0) { 5979 ret = -EINVAL; 5980 goto out; 5981 } 5982 5983 if (idev) { 5984 if (check_stable_privacy(idev, net, new_val) < 0) { 5985 ret = -EINVAL; 5986 goto out; 5987 } 5988 5989 if (idev->cnf.addr_gen_mode != new_val) { 5990 idev->cnf.addr_gen_mode = new_val; 5991 addrconf_dev_config(idev->dev); 5992 } 5993 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 5994 struct net_device *dev; 5995 5996 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 5997 for_each_netdev(net, dev) { 5998 idev = __in6_dev_get(dev); 5999 if (idev && 6000 idev->cnf.addr_gen_mode != new_val) { 6001 idev->cnf.addr_gen_mode = new_val; 6002 addrconf_dev_config(idev->dev); 6003 } 6004 } 6005 } 6006 6007 *((u32 *)ctl->data) = new_val; 6008 } 6009 6010 out: 6011 rtnl_unlock(); 6012 6013 return ret; 6014 } 6015 6016 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6017 void __user *buffer, size_t *lenp, 6018 loff_t *ppos) 6019 { 6020 int err; 6021 struct in6_addr addr; 6022 char str[IPV6_MAX_STRLEN]; 6023 struct ctl_table lctl = *ctl; 6024 struct net *net = ctl->extra2; 6025 struct ipv6_stable_secret *secret = ctl->data; 6026 6027 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6028 return -EIO; 6029 6030 lctl.maxlen = IPV6_MAX_STRLEN; 6031 lctl.data = str; 6032 6033 if (!rtnl_trylock()) 6034 return restart_syscall(); 6035 6036 if (!write && !secret->initialized) { 6037 err = -EIO; 6038 goto out; 6039 } 6040 6041 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6042 if (err >= sizeof(str)) { 6043 err = -EIO; 6044 goto out; 6045 } 6046 6047 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6048 if (err || !write) 6049 goto out; 6050 6051 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6052 err = -EIO; 6053 goto out; 6054 } 6055 6056 secret->initialized = true; 6057 secret->secret = addr; 6058 6059 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6060 struct net_device *dev; 6061 6062 for_each_netdev(net, dev) { 6063 struct inet6_dev *idev = __in6_dev_get(dev); 6064 6065 if (idev) { 6066 idev->cnf.addr_gen_mode = 6067 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6068 } 6069 } 6070 } else { 6071 struct inet6_dev *idev = ctl->extra1; 6072 6073 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6074 } 6075 6076 out: 6077 rtnl_unlock(); 6078 6079 return err; 6080 } 6081 6082 static 6083 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6084 int write, 6085 void __user *buffer, 6086 size_t *lenp, 6087 loff_t *ppos) 6088 { 6089 int *valp = ctl->data; 6090 int val = *valp; 6091 loff_t pos = *ppos; 6092 struct ctl_table lctl; 6093 int ret; 6094 6095 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6096 * we should not modify it until we get the rtnl lock. 6097 */ 6098 lctl = *ctl; 6099 lctl.data = &val; 6100 6101 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6102 6103 if (write) 6104 ret = addrconf_fixup_linkdown(ctl, valp, val); 6105 if (ret) 6106 *ppos = pos; 6107 return ret; 6108 } 6109 6110 static 6111 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6112 { 6113 if (rt) { 6114 if (action) 6115 rt->dst.flags |= DST_NOPOLICY; 6116 else 6117 rt->dst.flags &= ~DST_NOPOLICY; 6118 } 6119 } 6120 6121 static 6122 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6123 { 6124 struct inet6_ifaddr *ifa; 6125 6126 read_lock_bh(&idev->lock); 6127 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6128 spin_lock(&ifa->lock); 6129 if (ifa->rt) { 6130 struct fib6_info *rt = ifa->rt; 6131 int cpu; 6132 6133 rcu_read_lock(); 6134 ifa->rt->dst_nopolicy = val ? true : false; 6135 if (rt->rt6i_pcpu) { 6136 for_each_possible_cpu(cpu) { 6137 struct rt6_info **rtp; 6138 6139 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 6140 addrconf_set_nopolicy(*rtp, val); 6141 } 6142 } 6143 rcu_read_unlock(); 6144 } 6145 spin_unlock(&ifa->lock); 6146 } 6147 read_unlock_bh(&idev->lock); 6148 } 6149 6150 static 6151 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6152 { 6153 struct inet6_dev *idev; 6154 struct net *net; 6155 6156 if (!rtnl_trylock()) 6157 return restart_syscall(); 6158 6159 *valp = val; 6160 6161 net = (struct net *)ctl->extra2; 6162 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6163 rtnl_unlock(); 6164 return 0; 6165 } 6166 6167 if (valp == &net->ipv6.devconf_all->disable_policy) { 6168 struct net_device *dev; 6169 6170 for_each_netdev(net, dev) { 6171 idev = __in6_dev_get(dev); 6172 if (idev) 6173 addrconf_disable_policy_idev(idev, val); 6174 } 6175 } else { 6176 idev = (struct inet6_dev *)ctl->extra1; 6177 addrconf_disable_policy_idev(idev, val); 6178 } 6179 6180 rtnl_unlock(); 6181 return 0; 6182 } 6183 6184 static 6185 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6186 void __user *buffer, size_t *lenp, 6187 loff_t *ppos) 6188 { 6189 int *valp = ctl->data; 6190 int val = *valp; 6191 loff_t pos = *ppos; 6192 struct ctl_table lctl; 6193 int ret; 6194 6195 lctl = *ctl; 6196 lctl.data = &val; 6197 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6198 6199 if (write && (*valp != val)) 6200 ret = addrconf_disable_policy(ctl, valp, val); 6201 6202 if (ret) 6203 *ppos = pos; 6204 6205 return ret; 6206 } 6207 6208 static int minus_one = -1; 6209 static const int zero = 0; 6210 static const int one = 1; 6211 static const int two_five_five = 255; 6212 6213 static const struct ctl_table addrconf_sysctl[] = { 6214 { 6215 .procname = "forwarding", 6216 .data = &ipv6_devconf.forwarding, 6217 .maxlen = sizeof(int), 6218 .mode = 0644, 6219 .proc_handler = addrconf_sysctl_forward, 6220 }, 6221 { 6222 .procname = "hop_limit", 6223 .data = &ipv6_devconf.hop_limit, 6224 .maxlen = sizeof(int), 6225 .mode = 0644, 6226 .proc_handler = proc_dointvec_minmax, 6227 .extra1 = (void *)&one, 6228 .extra2 = (void *)&two_five_five, 6229 }, 6230 { 6231 .procname = "mtu", 6232 .data = &ipv6_devconf.mtu6, 6233 .maxlen = sizeof(int), 6234 .mode = 0644, 6235 .proc_handler = addrconf_sysctl_mtu, 6236 }, 6237 { 6238 .procname = "accept_ra", 6239 .data = &ipv6_devconf.accept_ra, 6240 .maxlen = sizeof(int), 6241 .mode = 0644, 6242 .proc_handler = proc_dointvec, 6243 }, 6244 { 6245 .procname = "accept_redirects", 6246 .data = &ipv6_devconf.accept_redirects, 6247 .maxlen = sizeof(int), 6248 .mode = 0644, 6249 .proc_handler = proc_dointvec, 6250 }, 6251 { 6252 .procname = "autoconf", 6253 .data = &ipv6_devconf.autoconf, 6254 .maxlen = sizeof(int), 6255 .mode = 0644, 6256 .proc_handler = proc_dointvec, 6257 }, 6258 { 6259 .procname = "dad_transmits", 6260 .data = &ipv6_devconf.dad_transmits, 6261 .maxlen = sizeof(int), 6262 .mode = 0644, 6263 .proc_handler = proc_dointvec, 6264 }, 6265 { 6266 .procname = "router_solicitations", 6267 .data = &ipv6_devconf.rtr_solicits, 6268 .maxlen = sizeof(int), 6269 .mode = 0644, 6270 .proc_handler = proc_dointvec_minmax, 6271 .extra1 = &minus_one, 6272 }, 6273 { 6274 .procname = "router_solicitation_interval", 6275 .data = &ipv6_devconf.rtr_solicit_interval, 6276 .maxlen = sizeof(int), 6277 .mode = 0644, 6278 .proc_handler = proc_dointvec_jiffies, 6279 }, 6280 { 6281 .procname = "router_solicitation_max_interval", 6282 .data = &ipv6_devconf.rtr_solicit_max_interval, 6283 .maxlen = sizeof(int), 6284 .mode = 0644, 6285 .proc_handler = proc_dointvec_jiffies, 6286 }, 6287 { 6288 .procname = "router_solicitation_delay", 6289 .data = &ipv6_devconf.rtr_solicit_delay, 6290 .maxlen = sizeof(int), 6291 .mode = 0644, 6292 .proc_handler = proc_dointvec_jiffies, 6293 }, 6294 { 6295 .procname = "force_mld_version", 6296 .data = &ipv6_devconf.force_mld_version, 6297 .maxlen = sizeof(int), 6298 .mode = 0644, 6299 .proc_handler = proc_dointvec, 6300 }, 6301 { 6302 .procname = "mldv1_unsolicited_report_interval", 6303 .data = 6304 &ipv6_devconf.mldv1_unsolicited_report_interval, 6305 .maxlen = sizeof(int), 6306 .mode = 0644, 6307 .proc_handler = proc_dointvec_ms_jiffies, 6308 }, 6309 { 6310 .procname = "mldv2_unsolicited_report_interval", 6311 .data = 6312 &ipv6_devconf.mldv2_unsolicited_report_interval, 6313 .maxlen = sizeof(int), 6314 .mode = 0644, 6315 .proc_handler = proc_dointvec_ms_jiffies, 6316 }, 6317 { 6318 .procname = "use_tempaddr", 6319 .data = &ipv6_devconf.use_tempaddr, 6320 .maxlen = sizeof(int), 6321 .mode = 0644, 6322 .proc_handler = proc_dointvec, 6323 }, 6324 { 6325 .procname = "temp_valid_lft", 6326 .data = &ipv6_devconf.temp_valid_lft, 6327 .maxlen = sizeof(int), 6328 .mode = 0644, 6329 .proc_handler = proc_dointvec, 6330 }, 6331 { 6332 .procname = "temp_prefered_lft", 6333 .data = &ipv6_devconf.temp_prefered_lft, 6334 .maxlen = sizeof(int), 6335 .mode = 0644, 6336 .proc_handler = proc_dointvec, 6337 }, 6338 { 6339 .procname = "regen_max_retry", 6340 .data = &ipv6_devconf.regen_max_retry, 6341 .maxlen = sizeof(int), 6342 .mode = 0644, 6343 .proc_handler = proc_dointvec, 6344 }, 6345 { 6346 .procname = "max_desync_factor", 6347 .data = &ipv6_devconf.max_desync_factor, 6348 .maxlen = sizeof(int), 6349 .mode = 0644, 6350 .proc_handler = proc_dointvec, 6351 }, 6352 { 6353 .procname = "max_addresses", 6354 .data = &ipv6_devconf.max_addresses, 6355 .maxlen = sizeof(int), 6356 .mode = 0644, 6357 .proc_handler = proc_dointvec, 6358 }, 6359 { 6360 .procname = "accept_ra_defrtr", 6361 .data = &ipv6_devconf.accept_ra_defrtr, 6362 .maxlen = sizeof(int), 6363 .mode = 0644, 6364 .proc_handler = proc_dointvec, 6365 }, 6366 { 6367 .procname = "accept_ra_min_hop_limit", 6368 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6369 .maxlen = sizeof(int), 6370 .mode = 0644, 6371 .proc_handler = proc_dointvec, 6372 }, 6373 { 6374 .procname = "accept_ra_pinfo", 6375 .data = &ipv6_devconf.accept_ra_pinfo, 6376 .maxlen = sizeof(int), 6377 .mode = 0644, 6378 .proc_handler = proc_dointvec, 6379 }, 6380 #ifdef CONFIG_IPV6_ROUTER_PREF 6381 { 6382 .procname = "accept_ra_rtr_pref", 6383 .data = &ipv6_devconf.accept_ra_rtr_pref, 6384 .maxlen = sizeof(int), 6385 .mode = 0644, 6386 .proc_handler = proc_dointvec, 6387 }, 6388 { 6389 .procname = "router_probe_interval", 6390 .data = &ipv6_devconf.rtr_probe_interval, 6391 .maxlen = sizeof(int), 6392 .mode = 0644, 6393 .proc_handler = proc_dointvec_jiffies, 6394 }, 6395 #ifdef CONFIG_IPV6_ROUTE_INFO 6396 { 6397 .procname = "accept_ra_rt_info_min_plen", 6398 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6399 .maxlen = sizeof(int), 6400 .mode = 0644, 6401 .proc_handler = proc_dointvec, 6402 }, 6403 { 6404 .procname = "accept_ra_rt_info_max_plen", 6405 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6406 .maxlen = sizeof(int), 6407 .mode = 0644, 6408 .proc_handler = proc_dointvec, 6409 }, 6410 #endif 6411 #endif 6412 { 6413 .procname = "proxy_ndp", 6414 .data = &ipv6_devconf.proxy_ndp, 6415 .maxlen = sizeof(int), 6416 .mode = 0644, 6417 .proc_handler = addrconf_sysctl_proxy_ndp, 6418 }, 6419 { 6420 .procname = "accept_source_route", 6421 .data = &ipv6_devconf.accept_source_route, 6422 .maxlen = sizeof(int), 6423 .mode = 0644, 6424 .proc_handler = proc_dointvec, 6425 }, 6426 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6427 { 6428 .procname = "optimistic_dad", 6429 .data = &ipv6_devconf.optimistic_dad, 6430 .maxlen = sizeof(int), 6431 .mode = 0644, 6432 .proc_handler = proc_dointvec, 6433 }, 6434 { 6435 .procname = "use_optimistic", 6436 .data = &ipv6_devconf.use_optimistic, 6437 .maxlen = sizeof(int), 6438 .mode = 0644, 6439 .proc_handler = proc_dointvec, 6440 }, 6441 #endif 6442 #ifdef CONFIG_IPV6_MROUTE 6443 { 6444 .procname = "mc_forwarding", 6445 .data = &ipv6_devconf.mc_forwarding, 6446 .maxlen = sizeof(int), 6447 .mode = 0444, 6448 .proc_handler = proc_dointvec, 6449 }, 6450 #endif 6451 { 6452 .procname = "disable_ipv6", 6453 .data = &ipv6_devconf.disable_ipv6, 6454 .maxlen = sizeof(int), 6455 .mode = 0644, 6456 .proc_handler = addrconf_sysctl_disable, 6457 }, 6458 { 6459 .procname = "accept_dad", 6460 .data = &ipv6_devconf.accept_dad, 6461 .maxlen = sizeof(int), 6462 .mode = 0644, 6463 .proc_handler = proc_dointvec, 6464 }, 6465 { 6466 .procname = "force_tllao", 6467 .data = &ipv6_devconf.force_tllao, 6468 .maxlen = sizeof(int), 6469 .mode = 0644, 6470 .proc_handler = proc_dointvec 6471 }, 6472 { 6473 .procname = "ndisc_notify", 6474 .data = &ipv6_devconf.ndisc_notify, 6475 .maxlen = sizeof(int), 6476 .mode = 0644, 6477 .proc_handler = proc_dointvec 6478 }, 6479 { 6480 .procname = "suppress_frag_ndisc", 6481 .data = &ipv6_devconf.suppress_frag_ndisc, 6482 .maxlen = sizeof(int), 6483 .mode = 0644, 6484 .proc_handler = proc_dointvec 6485 }, 6486 { 6487 .procname = "accept_ra_from_local", 6488 .data = &ipv6_devconf.accept_ra_from_local, 6489 .maxlen = sizeof(int), 6490 .mode = 0644, 6491 .proc_handler = proc_dointvec, 6492 }, 6493 { 6494 .procname = "accept_ra_mtu", 6495 .data = &ipv6_devconf.accept_ra_mtu, 6496 .maxlen = sizeof(int), 6497 .mode = 0644, 6498 .proc_handler = proc_dointvec, 6499 }, 6500 { 6501 .procname = "stable_secret", 6502 .data = &ipv6_devconf.stable_secret, 6503 .maxlen = IPV6_MAX_STRLEN, 6504 .mode = 0600, 6505 .proc_handler = addrconf_sysctl_stable_secret, 6506 }, 6507 { 6508 .procname = "use_oif_addrs_only", 6509 .data = &ipv6_devconf.use_oif_addrs_only, 6510 .maxlen = sizeof(int), 6511 .mode = 0644, 6512 .proc_handler = proc_dointvec, 6513 }, 6514 { 6515 .procname = "ignore_routes_with_linkdown", 6516 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6517 .maxlen = sizeof(int), 6518 .mode = 0644, 6519 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6520 }, 6521 { 6522 .procname = "drop_unicast_in_l2_multicast", 6523 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6524 .maxlen = sizeof(int), 6525 .mode = 0644, 6526 .proc_handler = proc_dointvec, 6527 }, 6528 { 6529 .procname = "drop_unsolicited_na", 6530 .data = &ipv6_devconf.drop_unsolicited_na, 6531 .maxlen = sizeof(int), 6532 .mode = 0644, 6533 .proc_handler = proc_dointvec, 6534 }, 6535 { 6536 .procname = "keep_addr_on_down", 6537 .data = &ipv6_devconf.keep_addr_on_down, 6538 .maxlen = sizeof(int), 6539 .mode = 0644, 6540 .proc_handler = proc_dointvec, 6541 6542 }, 6543 { 6544 .procname = "seg6_enabled", 6545 .data = &ipv6_devconf.seg6_enabled, 6546 .maxlen = sizeof(int), 6547 .mode = 0644, 6548 .proc_handler = proc_dointvec, 6549 }, 6550 #ifdef CONFIG_IPV6_SEG6_HMAC 6551 { 6552 .procname = "seg6_require_hmac", 6553 .data = &ipv6_devconf.seg6_require_hmac, 6554 .maxlen = sizeof(int), 6555 .mode = 0644, 6556 .proc_handler = proc_dointvec, 6557 }, 6558 #endif 6559 { 6560 .procname = "enhanced_dad", 6561 .data = &ipv6_devconf.enhanced_dad, 6562 .maxlen = sizeof(int), 6563 .mode = 0644, 6564 .proc_handler = proc_dointvec, 6565 }, 6566 { 6567 .procname = "addr_gen_mode", 6568 .data = &ipv6_devconf.addr_gen_mode, 6569 .maxlen = sizeof(int), 6570 .mode = 0644, 6571 .proc_handler = addrconf_sysctl_addr_gen_mode, 6572 }, 6573 { 6574 .procname = "disable_policy", 6575 .data = &ipv6_devconf.disable_policy, 6576 .maxlen = sizeof(int), 6577 .mode = 0644, 6578 .proc_handler = addrconf_sysctl_disable_policy, 6579 }, 6580 { 6581 .procname = "ndisc_tclass", 6582 .data = &ipv6_devconf.ndisc_tclass, 6583 .maxlen = sizeof(int), 6584 .mode = 0644, 6585 .proc_handler = proc_dointvec_minmax, 6586 .extra1 = (void *)&zero, 6587 .extra2 = (void *)&two_five_five, 6588 }, 6589 { 6590 /* sentinel */ 6591 } 6592 }; 6593 6594 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6595 struct inet6_dev *idev, struct ipv6_devconf *p) 6596 { 6597 int i, ifindex; 6598 struct ctl_table *table; 6599 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6600 6601 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6602 if (!table) 6603 goto out; 6604 6605 for (i = 0; table[i].data; i++) { 6606 table[i].data += (char *)p - (char *)&ipv6_devconf; 6607 /* If one of these is already set, then it is not safe to 6608 * overwrite either of them: this makes proc_dointvec_minmax 6609 * usable. 6610 */ 6611 if (!table[i].extra1 && !table[i].extra2) { 6612 table[i].extra1 = idev; /* embedded; no ref */ 6613 table[i].extra2 = net; 6614 } 6615 } 6616 6617 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6618 6619 p->sysctl_header = register_net_sysctl(net, path, table); 6620 if (!p->sysctl_header) 6621 goto free; 6622 6623 if (!strcmp(dev_name, "all")) 6624 ifindex = NETCONFA_IFINDEX_ALL; 6625 else if (!strcmp(dev_name, "default")) 6626 ifindex = NETCONFA_IFINDEX_DEFAULT; 6627 else 6628 ifindex = idev->dev->ifindex; 6629 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6630 ifindex, p); 6631 return 0; 6632 6633 free: 6634 kfree(table); 6635 out: 6636 return -ENOBUFS; 6637 } 6638 6639 static void __addrconf_sysctl_unregister(struct net *net, 6640 struct ipv6_devconf *p, int ifindex) 6641 { 6642 struct ctl_table *table; 6643 6644 if (!p->sysctl_header) 6645 return; 6646 6647 table = p->sysctl_header->ctl_table_arg; 6648 unregister_net_sysctl_table(p->sysctl_header); 6649 p->sysctl_header = NULL; 6650 kfree(table); 6651 6652 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6653 } 6654 6655 static int addrconf_sysctl_register(struct inet6_dev *idev) 6656 { 6657 int err; 6658 6659 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6660 return -EINVAL; 6661 6662 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6663 &ndisc_ifinfo_sysctl_change); 6664 if (err) 6665 return err; 6666 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6667 idev, &idev->cnf); 6668 if (err) 6669 neigh_sysctl_unregister(idev->nd_parms); 6670 6671 return err; 6672 } 6673 6674 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6675 { 6676 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6677 idev->dev->ifindex); 6678 neigh_sysctl_unregister(idev->nd_parms); 6679 } 6680 6681 6682 #endif 6683 6684 static int __net_init addrconf_init_net(struct net *net) 6685 { 6686 int err = -ENOMEM; 6687 struct ipv6_devconf *all, *dflt; 6688 6689 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6690 if (!all) 6691 goto err_alloc_all; 6692 6693 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6694 if (!dflt) 6695 goto err_alloc_dflt; 6696 6697 /* these will be inherited by all namespaces */ 6698 dflt->autoconf = ipv6_defaults.autoconf; 6699 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6700 6701 dflt->stable_secret.initialized = false; 6702 all->stable_secret.initialized = false; 6703 6704 net->ipv6.devconf_all = all; 6705 net->ipv6.devconf_dflt = dflt; 6706 6707 #ifdef CONFIG_SYSCTL 6708 err = __addrconf_sysctl_register(net, "all", NULL, all); 6709 if (err < 0) 6710 goto err_reg_all; 6711 6712 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6713 if (err < 0) 6714 goto err_reg_dflt; 6715 #endif 6716 return 0; 6717 6718 #ifdef CONFIG_SYSCTL 6719 err_reg_dflt: 6720 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6721 err_reg_all: 6722 kfree(dflt); 6723 #endif 6724 err_alloc_dflt: 6725 kfree(all); 6726 err_alloc_all: 6727 return err; 6728 } 6729 6730 static void __net_exit addrconf_exit_net(struct net *net) 6731 { 6732 #ifdef CONFIG_SYSCTL 6733 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6734 NETCONFA_IFINDEX_DEFAULT); 6735 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6736 NETCONFA_IFINDEX_ALL); 6737 #endif 6738 kfree(net->ipv6.devconf_dflt); 6739 kfree(net->ipv6.devconf_all); 6740 } 6741 6742 static struct pernet_operations addrconf_ops = { 6743 .init = addrconf_init_net, 6744 .exit = addrconf_exit_net, 6745 }; 6746 6747 static struct rtnl_af_ops inet6_ops __read_mostly = { 6748 .family = AF_INET6, 6749 .fill_link_af = inet6_fill_link_af, 6750 .get_link_af_size = inet6_get_link_af_size, 6751 .validate_link_af = inet6_validate_link_af, 6752 .set_link_af = inet6_set_link_af, 6753 }; 6754 6755 /* 6756 * Init / cleanup code 6757 */ 6758 6759 int __init addrconf_init(void) 6760 { 6761 struct inet6_dev *idev; 6762 int i, err; 6763 6764 err = ipv6_addr_label_init(); 6765 if (err < 0) { 6766 pr_crit("%s: cannot initialize default policy table: %d\n", 6767 __func__, err); 6768 goto out; 6769 } 6770 6771 err = register_pernet_subsys(&addrconf_ops); 6772 if (err < 0) 6773 goto out_addrlabel; 6774 6775 addrconf_wq = create_workqueue("ipv6_addrconf"); 6776 if (!addrconf_wq) { 6777 err = -ENOMEM; 6778 goto out_nowq; 6779 } 6780 6781 /* The addrconf netdev notifier requires that loopback_dev 6782 * has it's ipv6 private information allocated and setup 6783 * before it can bring up and give link-local addresses 6784 * to other devices which are up. 6785 * 6786 * Unfortunately, loopback_dev is not necessarily the first 6787 * entry in the global dev_base list of net devices. In fact, 6788 * it is likely to be the very last entry on that list. 6789 * So this causes the notifier registry below to try and 6790 * give link-local addresses to all devices besides loopback_dev 6791 * first, then loopback_dev, which cases all the non-loopback_dev 6792 * devices to fail to get a link-local address. 6793 * 6794 * So, as a temporary fix, allocate the ipv6 structure for 6795 * loopback_dev first by hand. 6796 * Longer term, all of the dependencies ipv6 has upon the loopback 6797 * device and it being up should be removed. 6798 */ 6799 rtnl_lock(); 6800 idev = ipv6_add_dev(init_net.loopback_dev); 6801 rtnl_unlock(); 6802 if (IS_ERR(idev)) { 6803 err = PTR_ERR(idev); 6804 goto errlo; 6805 } 6806 6807 ip6_route_init_special_entries(); 6808 6809 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6810 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6811 6812 register_netdevice_notifier(&ipv6_dev_notf); 6813 6814 addrconf_verify(); 6815 6816 rtnl_af_register(&inet6_ops); 6817 6818 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6819 NULL, inet6_dump_ifinfo, 0); 6820 if (err < 0) 6821 goto errout; 6822 6823 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6824 inet6_rtm_newaddr, NULL, 0); 6825 if (err < 0) 6826 goto errout; 6827 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6828 inet6_rtm_deladdr, NULL, 0); 6829 if (err < 0) 6830 goto errout; 6831 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6832 inet6_rtm_getaddr, inet6_dump_ifaddr, 6833 RTNL_FLAG_DOIT_UNLOCKED); 6834 if (err < 0) 6835 goto errout; 6836 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6837 NULL, inet6_dump_ifmcaddr, 0); 6838 if (err < 0) 6839 goto errout; 6840 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6841 NULL, inet6_dump_ifacaddr, 0); 6842 if (err < 0) 6843 goto errout; 6844 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6845 inet6_netconf_get_devconf, 6846 inet6_netconf_dump_devconf, 6847 RTNL_FLAG_DOIT_UNLOCKED); 6848 if (err < 0) 6849 goto errout; 6850 err = ipv6_addr_label_rtnl_register(); 6851 if (err < 0) 6852 goto errout; 6853 6854 return 0; 6855 errout: 6856 rtnl_unregister_all(PF_INET6); 6857 rtnl_af_unregister(&inet6_ops); 6858 unregister_netdevice_notifier(&ipv6_dev_notf); 6859 errlo: 6860 destroy_workqueue(addrconf_wq); 6861 out_nowq: 6862 unregister_pernet_subsys(&addrconf_ops); 6863 out_addrlabel: 6864 ipv6_addr_label_cleanup(); 6865 out: 6866 return err; 6867 } 6868 6869 void addrconf_cleanup(void) 6870 { 6871 struct net_device *dev; 6872 int i; 6873 6874 unregister_netdevice_notifier(&ipv6_dev_notf); 6875 unregister_pernet_subsys(&addrconf_ops); 6876 ipv6_addr_label_cleanup(); 6877 6878 rtnl_af_unregister(&inet6_ops); 6879 6880 rtnl_lock(); 6881 6882 /* clean dev list */ 6883 for_each_netdev(&init_net, dev) { 6884 if (__in6_dev_get(dev) == NULL) 6885 continue; 6886 addrconf_ifdown(dev, 1); 6887 } 6888 addrconf_ifdown(init_net.loopback_dev, 2); 6889 6890 /* 6891 * Check hash table. 6892 */ 6893 spin_lock_bh(&addrconf_hash_lock); 6894 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6895 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6896 spin_unlock_bh(&addrconf_hash_lock); 6897 cancel_delayed_work(&addr_chk_work); 6898 rtnl_unlock(); 6899 6900 destroy_workqueue(addrconf_wq); 6901 } 6902