1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(const struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 /* 161 * Configured unicast address hash table 162 */ 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 164 static DEFINE_SPINLOCK(addrconf_hash_lock); 165 166 static void addrconf_verify(void); 167 static void addrconf_verify_rtnl(void); 168 static void addrconf_verify_work(struct work_struct *); 169 170 static struct workqueue_struct *addrconf_wq; 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 172 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 175 176 static void addrconf_type_change(struct net_device *dev, 177 unsigned long event); 178 static int addrconf_ifdown(struct net_device *dev, int how); 179 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 181 int plen, 182 const struct net_device *dev, 183 u32 flags, u32 noflags); 184 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 186 static void addrconf_dad_work(struct work_struct *w); 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 188 static void addrconf_dad_run(struct inet6_dev *idev); 189 static void addrconf_rs_timer(unsigned long data); 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 192 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 194 struct prefix_info *pinfo); 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 196 struct net_device *dev); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_min_plen = 0, 228 .accept_ra_rt_info_max_plen = 0, 229 #endif 230 #endif 231 .proxy_ndp = 0, 232 .accept_source_route = 0, /* we do not accept RH0 by default. */ 233 .disable_ipv6 = 0, 234 .accept_dad = 1, 235 .suppress_frag_ndisc = 1, 236 .accept_ra_mtu = 1, 237 .stable_secret = { 238 .initialized = false, 239 }, 240 .use_oif_addrs_only = 0, 241 .ignore_routes_with_linkdown = 0, 242 .keep_addr_on_down = 0, 243 .seg6_enabled = 0, 244 #ifdef CONFIG_IPV6_SEG6_HMAC 245 .seg6_require_hmac = 0, 246 #endif 247 .enhanced_dad = 1, 248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 249 .disable_policy = 0, 250 }; 251 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 253 .forwarding = 0, 254 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 255 .mtu6 = IPV6_MIN_MTU, 256 .accept_ra = 1, 257 .accept_redirects = 1, 258 .autoconf = 1, 259 .force_mld_version = 0, 260 .mldv1_unsolicited_report_interval = 10 * HZ, 261 .mldv2_unsolicited_report_interval = HZ, 262 .dad_transmits = 1, 263 .rtr_solicits = MAX_RTR_SOLICITATIONS, 264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 267 .use_tempaddr = 0, 268 .temp_valid_lft = TEMP_VALID_LIFETIME, 269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 270 .regen_max_retry = REGEN_MAX_RETRY, 271 .max_desync_factor = MAX_DESYNC_FACTOR, 272 .max_addresses = IPV6_MAX_ADDRESSES, 273 .accept_ra_defrtr = 1, 274 .accept_ra_from_local = 0, 275 .accept_ra_min_hop_limit= 1, 276 .accept_ra_pinfo = 1, 277 #ifdef CONFIG_IPV6_ROUTER_PREF 278 .accept_ra_rtr_pref = 1, 279 .rtr_probe_interval = 60 * HZ, 280 #ifdef CONFIG_IPV6_ROUTE_INFO 281 .accept_ra_rt_info_min_plen = 0, 282 .accept_ra_rt_info_max_plen = 0, 283 #endif 284 #endif 285 .proxy_ndp = 0, 286 .accept_source_route = 0, /* we do not accept RH0 by default. */ 287 .disable_ipv6 = 0, 288 .accept_dad = 1, 289 .suppress_frag_ndisc = 1, 290 .accept_ra_mtu = 1, 291 .stable_secret = { 292 .initialized = false, 293 }, 294 .use_oif_addrs_only = 0, 295 .ignore_routes_with_linkdown = 0, 296 .keep_addr_on_down = 0, 297 .seg6_enabled = 0, 298 #ifdef CONFIG_IPV6_SEG6_HMAC 299 .seg6_require_hmac = 0, 300 #endif 301 .enhanced_dad = 1, 302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 303 .disable_policy = 0, 304 }; 305 306 /* Check if link is ready: is it up and is a valid qdisc available */ 307 static inline bool addrconf_link_ready(const struct net_device *dev) 308 { 309 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 310 } 311 312 static void addrconf_del_rs_timer(struct inet6_dev *idev) 313 { 314 if (del_timer(&idev->rs_timer)) 315 __in6_dev_put(idev); 316 } 317 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 319 { 320 if (cancel_delayed_work(&ifp->dad_work)) 321 __in6_ifa_put(ifp); 322 } 323 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 325 unsigned long when) 326 { 327 if (!timer_pending(&idev->rs_timer)) 328 in6_dev_hold(idev); 329 mod_timer(&idev->rs_timer, jiffies + when); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 392 (unsigned long)ndev); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 else 398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 399 400 ndev->cnf.mtu6 = dev->mtu; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 dev_hold(dev); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 ADBG(KERN_WARNING 413 "%s: cannot allocate memory for statistics; dev=%s.\n", 414 __func__, dev->name); 415 neigh_parms_release(&nd_tbl, ndev->nd_parms); 416 dev_put(dev); 417 kfree(ndev); 418 return ERR_PTR(err); 419 } 420 421 if (snmp6_register_dev(ndev) < 0) { 422 ADBG(KERN_WARNING 423 "%s: cannot create /proc/net/dev_snmp6/%s\n", 424 __func__, dev->name); 425 goto err_release; 426 } 427 428 /* One reference from device. */ 429 refcount_set(&ndev->refcnt, 1); 430 431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 432 ndev->cnf.accept_dad = -1; 433 434 #if IS_ENABLED(CONFIG_IPV6_SIT) 435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 436 pr_info("%s: Disabled Multicast RS\n", dev->name); 437 ndev->cnf.rtr_solicits = 0; 438 } 439 #endif 440 441 INIT_LIST_HEAD(&ndev->tempaddr_list); 442 ndev->desync_factor = U32_MAX; 443 if ((dev->flags&IFF_LOOPBACK) || 444 dev->type == ARPHRD_TUNNEL || 445 dev->type == ARPHRD_TUNNEL6 || 446 dev->type == ARPHRD_SIT || 447 dev->type == ARPHRD_NONE) { 448 ndev->cnf.use_tempaddr = -1; 449 } else 450 ipv6_regen_rndid(ndev); 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_link_ready(dev)) 455 ndev->if_flags |= IF_READY; 456 457 ipv6_mc_init_dev(ndev); 458 ndev->tstamp = jiffies; 459 err = addrconf_sysctl_register(ndev); 460 if (err) { 461 ipv6_mc_destroy_dev(ndev); 462 snmp6_unregister_dev(ndev); 463 goto err_release; 464 } 465 /* protected by rtnl_lock */ 466 rcu_assign_pointer(dev->ip6_ptr, ndev); 467 468 /* Join interface-local all-node multicast group */ 469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 470 471 /* Join all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 473 474 /* Join all-router multicast group if forwarding is set */ 475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 477 478 return ndev; 479 480 err_release: 481 neigh_parms_release(&nd_tbl, ndev->nd_parms); 482 ndev->dead = 1; 483 in6_dev_finish_destroy(ndev); 484 return ERR_PTR(err); 485 } 486 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 488 { 489 struct inet6_dev *idev; 490 491 ASSERT_RTNL(); 492 493 idev = __in6_dev_get(dev); 494 if (!idev) { 495 idev = ipv6_add_dev(dev); 496 if (IS_ERR(idev)) 497 return NULL; 498 } 499 500 if (dev->flags&IFF_UP) 501 ipv6_mc_up(idev); 502 return idev; 503 } 504 505 static int inet6_netconf_msgsize_devconf(int type) 506 { 507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 508 + nla_total_size(4); /* NETCONFA_IFINDEX */ 509 bool all = false; 510 511 if (type == NETCONFA_ALL) 512 all = true; 513 514 if (all || type == NETCONFA_FORWARDING) 515 size += nla_total_size(4); 516 #ifdef CONFIG_IPV6_MROUTE 517 if (all || type == NETCONFA_MC_FORWARDING) 518 size += nla_total_size(4); 519 #endif 520 if (all || type == NETCONFA_PROXY_NEIGH) 521 size += nla_total_size(4); 522 523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 524 size += nla_total_size(4); 525 526 return size; 527 } 528 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 530 struct ipv6_devconf *devconf, u32 portid, 531 u32 seq, int event, unsigned int flags, 532 int type) 533 { 534 struct nlmsghdr *nlh; 535 struct netconfmsg *ncm; 536 bool all = false; 537 538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 539 flags); 540 if (!nlh) 541 return -EMSGSIZE; 542 543 if (type == NETCONFA_ALL) 544 all = true; 545 546 ncm = nlmsg_data(nlh); 547 ncm->ncm_family = AF_INET6; 548 549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 550 goto nla_put_failure; 551 552 if (!devconf) 553 goto out; 554 555 if ((all || type == NETCONFA_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 557 goto nla_put_failure; 558 #ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 devconf->mc_forwarding) < 0) 562 goto nla_put_failure; 563 #endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 566 goto nla_put_failure; 567 568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 570 devconf->ignore_routes_with_linkdown) < 0) 571 goto nla_put_failure; 572 573 out: 574 nlmsg_end(skb, nlh); 575 return 0; 576 577 nla_put_failure: 578 nlmsg_cancel(skb, nlh); 579 return -EMSGSIZE; 580 } 581 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 583 int ifindex, struct ipv6_devconf *devconf) 584 { 585 struct sk_buff *skb; 586 int err = -ENOBUFS; 587 588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 589 if (!skb) 590 goto errout; 591 592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 593 event, 0, type); 594 if (err < 0) { 595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 596 WARN_ON(err == -EMSGSIZE); 597 kfree_skb(skb); 598 goto errout; 599 } 600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 601 return; 602 errout: 603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 604 } 605 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 607 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 608 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 611 }; 612 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 614 struct nlmsghdr *nlh, 615 struct netlink_ext_ack *extack) 616 { 617 struct net *net = sock_net(in_skb->sk); 618 struct nlattr *tb[NETCONFA_MAX+1]; 619 struct inet6_dev *in6_dev = NULL; 620 struct net_device *dev = NULL; 621 struct netconfmsg *ncm; 622 struct sk_buff *skb; 623 struct ipv6_devconf *devconf; 624 int ifindex; 625 int err; 626 627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err < 0) 630 return err; 631 632 if (!tb[NETCONFA_IFINDEX]) 633 return -EINVAL; 634 635 err = -EINVAL; 636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 637 switch (ifindex) { 638 case NETCONFA_IFINDEX_ALL: 639 devconf = net->ipv6.devconf_all; 640 break; 641 case NETCONFA_IFINDEX_DEFAULT: 642 devconf = net->ipv6.devconf_dflt; 643 break; 644 default: 645 dev = dev_get_by_index(net, ifindex); 646 if (!dev) 647 return -EINVAL; 648 in6_dev = in6_dev_get(dev); 649 if (!in6_dev) 650 goto errout; 651 devconf = &in6_dev->cnf; 652 break; 653 } 654 655 err = -ENOBUFS; 656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 657 if (!skb) 658 goto errout; 659 660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 661 NETLINK_CB(in_skb).portid, 662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 663 NETCONFA_ALL); 664 if (err < 0) { 665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 666 WARN_ON(err == -EMSGSIZE); 667 kfree_skb(skb); 668 goto errout; 669 } 670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 671 errout: 672 if (in6_dev) 673 in6_dev_put(in6_dev); 674 if (dev) 675 dev_put(dev); 676 return err; 677 } 678 679 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 680 struct netlink_callback *cb) 681 { 682 struct net *net = sock_net(skb->sk); 683 int h, s_h; 684 int idx, s_idx; 685 struct net_device *dev; 686 struct inet6_dev *idev; 687 struct hlist_head *head; 688 689 s_h = cb->args[0]; 690 s_idx = idx = cb->args[1]; 691 692 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 693 idx = 0; 694 head = &net->dev_index_head[h]; 695 rcu_read_lock(); 696 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 697 net->dev_base_seq; 698 hlist_for_each_entry_rcu(dev, head, index_hlist) { 699 if (idx < s_idx) 700 goto cont; 701 idev = __in6_dev_get(dev); 702 if (!idev) 703 goto cont; 704 705 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 706 &idev->cnf, 707 NETLINK_CB(cb->skb).portid, 708 cb->nlh->nlmsg_seq, 709 RTM_NEWNETCONF, 710 NLM_F_MULTI, 711 NETCONFA_ALL) < 0) { 712 rcu_read_unlock(); 713 goto done; 714 } 715 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 716 cont: 717 idx++; 718 } 719 rcu_read_unlock(); 720 } 721 if (h == NETDEV_HASHENTRIES) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 723 net->ipv6.devconf_all, 724 NETLINK_CB(cb->skb).portid, 725 cb->nlh->nlmsg_seq, 726 RTM_NEWNETCONF, NLM_F_MULTI, 727 NETCONFA_ALL) < 0) 728 goto done; 729 else 730 h++; 731 } 732 if (h == NETDEV_HASHENTRIES + 1) { 733 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 734 net->ipv6.devconf_dflt, 735 NETLINK_CB(cb->skb).portid, 736 cb->nlh->nlmsg_seq, 737 RTM_NEWNETCONF, NLM_F_MULTI, 738 NETCONFA_ALL) < 0) 739 goto done; 740 else 741 h++; 742 } 743 done: 744 cb->args[0] = h; 745 cb->args[1] = idx; 746 747 return skb->len; 748 } 749 750 #ifdef CONFIG_SYSCTL 751 static void dev_forward_change(struct inet6_dev *idev) 752 { 753 struct net_device *dev; 754 struct inet6_ifaddr *ifa; 755 756 if (!idev) 757 return; 758 dev = idev->dev; 759 if (idev->cnf.forwarding) 760 dev_disable_lro(dev); 761 if (dev->flags & IFF_MULTICAST) { 762 if (idev->cnf.forwarding) { 763 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 764 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 765 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 766 } else { 767 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 768 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 769 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 770 } 771 } 772 773 list_for_each_entry(ifa, &idev->addr_list, if_list) { 774 if (ifa->flags&IFA_F_TENTATIVE) 775 continue; 776 if (idev->cnf.forwarding) 777 addrconf_join_anycast(ifa); 778 else 779 addrconf_leave_anycast(ifa); 780 } 781 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 782 NETCONFA_FORWARDING, 783 dev->ifindex, &idev->cnf); 784 } 785 786 787 static void addrconf_forward_change(struct net *net, __s32 newf) 788 { 789 struct net_device *dev; 790 struct inet6_dev *idev; 791 792 for_each_netdev(net, dev) { 793 idev = __in6_dev_get(dev); 794 if (idev) { 795 int changed = (!idev->cnf.forwarding) ^ (!newf); 796 idev->cnf.forwarding = newf; 797 if (changed) 798 dev_forward_change(idev); 799 } 800 } 801 } 802 803 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 804 { 805 struct net *net; 806 int old; 807 808 if (!rtnl_trylock()) 809 return restart_syscall(); 810 811 net = (struct net *)table->extra2; 812 old = *p; 813 *p = newf; 814 815 if (p == &net->ipv6.devconf_dflt->forwarding) { 816 if ((!newf) ^ (!old)) 817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 818 NETCONFA_FORWARDING, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 rtnl_unlock(); 822 return 0; 823 } 824 825 if (p == &net->ipv6.devconf_all->forwarding) { 826 int old_dflt = net->ipv6.devconf_dflt->forwarding; 827 828 net->ipv6.devconf_dflt->forwarding = newf; 829 if ((!newf) ^ (!old_dflt)) 830 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 831 NETCONFA_FORWARDING, 832 NETCONFA_IFINDEX_DEFAULT, 833 net->ipv6.devconf_dflt); 834 835 addrconf_forward_change(net, newf); 836 if ((!newf) ^ (!old)) 837 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 838 NETCONFA_FORWARDING, 839 NETCONFA_IFINDEX_ALL, 840 net->ipv6.devconf_all); 841 } else if ((!newf) ^ (!old)) 842 dev_forward_change((struct inet6_dev *)table->extra1); 843 rtnl_unlock(); 844 845 if (newf) 846 rt6_purge_dflt_routers(net); 847 return 1; 848 } 849 850 static void addrconf_linkdown_change(struct net *net, __s32 newf) 851 { 852 struct net_device *dev; 853 struct inet6_dev *idev; 854 855 for_each_netdev(net, dev) { 856 idev = __in6_dev_get(dev); 857 if (idev) { 858 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 859 860 idev->cnf.ignore_routes_with_linkdown = newf; 861 if (changed) 862 inet6_netconf_notify_devconf(dev_net(dev), 863 RTM_NEWNETCONF, 864 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 865 dev->ifindex, 866 &idev->cnf); 867 } 868 } 869 } 870 871 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 872 { 873 struct net *net; 874 int old; 875 876 if (!rtnl_trylock()) 877 return restart_syscall(); 878 879 net = (struct net *)table->extra2; 880 old = *p; 881 *p = newf; 882 883 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, 886 RTM_NEWNETCONF, 887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 rtnl_unlock(); 891 return 0; 892 } 893 894 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 895 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 896 addrconf_linkdown_change(net, newf); 897 if ((!newf) ^ (!old)) 898 inet6_netconf_notify_devconf(net, 899 RTM_NEWNETCONF, 900 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 901 NETCONFA_IFINDEX_ALL, 902 net->ipv6.devconf_all); 903 } 904 rtnl_unlock(); 905 906 return 1; 907 } 908 909 #endif 910 911 /* Nobody refers to this ifaddr, destroy it */ 912 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 913 { 914 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 915 916 #ifdef NET_REFCNT_DEBUG 917 pr_debug("%s\n", __func__); 918 #endif 919 920 in6_dev_put(ifp->idev); 921 922 if (cancel_delayed_work(&ifp->dad_work)) 923 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 924 ifp); 925 926 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 927 pr_warn("Freeing alive inet6 address %p\n", ifp); 928 return; 929 } 930 ip6_rt_put(ifp->rt); 931 932 kfree_rcu(ifp, rcu); 933 } 934 935 static void 936 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 937 { 938 struct list_head *p; 939 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 940 941 /* 942 * Each device address list is sorted in order of scope - 943 * global before linklocal. 944 */ 945 list_for_each(p, &idev->addr_list) { 946 struct inet6_ifaddr *ifa 947 = list_entry(p, struct inet6_ifaddr, if_list); 948 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 949 break; 950 } 951 952 list_add_tail_rcu(&ifp->if_list, p); 953 } 954 955 static u32 inet6_addr_hash(const struct in6_addr *addr) 956 { 957 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 958 } 959 960 /* On success it returns ifp with increased reference count */ 961 962 static struct inet6_ifaddr * 963 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 964 const struct in6_addr *peer_addr, int pfxlen, 965 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 966 { 967 struct net *net = dev_net(idev->dev); 968 struct inet6_ifaddr *ifa = NULL; 969 struct rt6_info *rt; 970 struct in6_validator_info i6vi; 971 unsigned int hash; 972 int err = 0; 973 int addr_type = ipv6_addr_type(addr); 974 975 if (addr_type == IPV6_ADDR_ANY || 976 addr_type & IPV6_ADDR_MULTICAST || 977 (!(idev->dev->flags & IFF_LOOPBACK) && 978 addr_type & IPV6_ADDR_LOOPBACK)) 979 return ERR_PTR(-EADDRNOTAVAIL); 980 981 rcu_read_lock_bh(); 982 983 in6_dev_hold(idev); 984 985 if (idev->dead) { 986 err = -ENODEV; /*XXX*/ 987 goto out2; 988 } 989 990 if (idev->cnf.disable_ipv6) { 991 err = -EACCES; 992 goto out2; 993 } 994 995 i6vi.i6vi_addr = *addr; 996 i6vi.i6vi_dev = idev; 997 rcu_read_unlock_bh(); 998 999 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1000 1001 rcu_read_lock_bh(); 1002 err = notifier_to_errno(err); 1003 if (err) 1004 goto out2; 1005 1006 spin_lock(&addrconf_hash_lock); 1007 1008 /* Ignore adding duplicate addresses on an interface */ 1009 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 1010 ADBG("ipv6_add_addr: already assigned\n"); 1011 err = -EEXIST; 1012 goto out; 1013 } 1014 1015 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 1016 1017 if (!ifa) { 1018 ADBG("ipv6_add_addr: malloc failed\n"); 1019 err = -ENOBUFS; 1020 goto out; 1021 } 1022 1023 rt = addrconf_dst_alloc(idev, addr, false); 1024 if (IS_ERR(rt)) { 1025 err = PTR_ERR(rt); 1026 goto out; 1027 } 1028 1029 if (net->ipv6.devconf_all->disable_policy || 1030 idev->cnf.disable_policy) 1031 rt->dst.flags |= DST_NOPOLICY; 1032 1033 neigh_parms_data_state_setall(idev->nd_parms); 1034 1035 ifa->addr = *addr; 1036 if (peer_addr) 1037 ifa->peer_addr = *peer_addr; 1038 1039 spin_lock_init(&ifa->lock); 1040 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1041 INIT_HLIST_NODE(&ifa->addr_lst); 1042 ifa->scope = scope; 1043 ifa->prefix_len = pfxlen; 1044 ifa->flags = flags; 1045 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1046 if (!(flags & IFA_F_NODAD)) 1047 ifa->flags |= IFA_F_TENTATIVE; 1048 ifa->valid_lft = valid_lft; 1049 ifa->prefered_lft = prefered_lft; 1050 ifa->cstamp = ifa->tstamp = jiffies; 1051 ifa->tokenized = false; 1052 1053 ifa->rt = rt; 1054 1055 ifa->idev = idev; 1056 /* For caller */ 1057 refcount_set(&ifa->refcnt, 1); 1058 1059 /* Add to big hash table */ 1060 hash = inet6_addr_hash(addr); 1061 1062 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1063 spin_unlock(&addrconf_hash_lock); 1064 1065 write_lock(&idev->lock); 1066 /* Add to inet6_dev unicast addr list. */ 1067 ipv6_link_dev_addr(idev, ifa); 1068 1069 if (ifa->flags&IFA_F_TEMPORARY) { 1070 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1071 in6_ifa_hold(ifa); 1072 } 1073 1074 in6_ifa_hold(ifa); 1075 write_unlock(&idev->lock); 1076 out2: 1077 rcu_read_unlock_bh(); 1078 1079 if (likely(err == 0)) 1080 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1081 else { 1082 kfree(ifa); 1083 in6_dev_put(idev); 1084 ifa = ERR_PTR(err); 1085 } 1086 1087 return ifa; 1088 out: 1089 spin_unlock(&addrconf_hash_lock); 1090 goto out2; 1091 } 1092 1093 enum cleanup_prefix_rt_t { 1094 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1095 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1096 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1097 }; 1098 1099 /* 1100 * Check, whether the prefix for ifp would still need a prefix route 1101 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1102 * constants. 1103 * 1104 * 1) we don't purge prefix if address was not permanent. 1105 * prefix is managed by its own lifetime. 1106 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1107 * 3) if there are no addresses, delete prefix. 1108 * 4) if there are still other permanent address(es), 1109 * corresponding prefix is still permanent. 1110 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1111 * don't purge the prefix, assume user space is managing it. 1112 * 6) otherwise, update prefix lifetime to the 1113 * longest valid lifetime among the corresponding 1114 * addresses on the device. 1115 * Note: subsequent RA will update lifetime. 1116 **/ 1117 static enum cleanup_prefix_rt_t 1118 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1119 { 1120 struct inet6_ifaddr *ifa; 1121 struct inet6_dev *idev = ifp->idev; 1122 unsigned long lifetime; 1123 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1124 1125 *expires = jiffies; 1126 1127 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1128 if (ifa == ifp) 1129 continue; 1130 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1131 ifp->prefix_len)) 1132 continue; 1133 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1134 return CLEANUP_PREFIX_RT_NOP; 1135 1136 action = CLEANUP_PREFIX_RT_EXPIRE; 1137 1138 spin_lock(&ifa->lock); 1139 1140 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1141 /* 1142 * Note: Because this address is 1143 * not permanent, lifetime < 1144 * LONG_MAX / HZ here. 1145 */ 1146 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1147 *expires = ifa->tstamp + lifetime * HZ; 1148 spin_unlock(&ifa->lock); 1149 } 1150 1151 return action; 1152 } 1153 1154 static void 1155 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1156 { 1157 struct rt6_info *rt; 1158 1159 rt = addrconf_get_prefix_route(&ifp->addr, 1160 ifp->prefix_len, 1161 ifp->idev->dev, 1162 0, RTF_GATEWAY | RTF_DEFAULT); 1163 if (rt) { 1164 if (del_rt) 1165 ip6_del_rt(rt); 1166 else { 1167 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1168 rt6_set_expires(rt, expires); 1169 ip6_rt_put(rt); 1170 } 1171 } 1172 } 1173 1174 1175 /* This function wants to get referenced ifp and releases it before return */ 1176 1177 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1178 { 1179 int state; 1180 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1181 unsigned long expires; 1182 1183 ASSERT_RTNL(); 1184 1185 spin_lock_bh(&ifp->lock); 1186 state = ifp->state; 1187 ifp->state = INET6_IFADDR_STATE_DEAD; 1188 spin_unlock_bh(&ifp->lock); 1189 1190 if (state == INET6_IFADDR_STATE_DEAD) 1191 goto out; 1192 1193 spin_lock_bh(&addrconf_hash_lock); 1194 hlist_del_init_rcu(&ifp->addr_lst); 1195 spin_unlock_bh(&addrconf_hash_lock); 1196 1197 write_lock_bh(&ifp->idev->lock); 1198 1199 if (ifp->flags&IFA_F_TEMPORARY) { 1200 list_del(&ifp->tmp_list); 1201 if (ifp->ifpub) { 1202 in6_ifa_put(ifp->ifpub); 1203 ifp->ifpub = NULL; 1204 } 1205 __in6_ifa_put(ifp); 1206 } 1207 1208 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1209 action = check_cleanup_prefix_route(ifp, &expires); 1210 1211 list_del_rcu(&ifp->if_list); 1212 __in6_ifa_put(ifp); 1213 1214 write_unlock_bh(&ifp->idev->lock); 1215 1216 addrconf_del_dad_work(ifp); 1217 1218 ipv6_ifa_notify(RTM_DELADDR, ifp); 1219 1220 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1221 1222 if (action != CLEANUP_PREFIX_RT_NOP) { 1223 cleanup_prefix_route(ifp, expires, 1224 action == CLEANUP_PREFIX_RT_DEL); 1225 } 1226 1227 /* clean up prefsrc entries */ 1228 rt6_remove_prefsrc(ifp); 1229 out: 1230 in6_ifa_put(ifp); 1231 } 1232 1233 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1234 { 1235 struct inet6_dev *idev = ifp->idev; 1236 struct in6_addr addr, *tmpaddr; 1237 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1238 unsigned long regen_advance; 1239 int tmp_plen; 1240 int ret = 0; 1241 u32 addr_flags; 1242 unsigned long now = jiffies; 1243 long max_desync_factor; 1244 s32 cnf_temp_preferred_lft; 1245 1246 write_lock_bh(&idev->lock); 1247 if (ift) { 1248 spin_lock_bh(&ift->lock); 1249 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1250 spin_unlock_bh(&ift->lock); 1251 tmpaddr = &addr; 1252 } else { 1253 tmpaddr = NULL; 1254 } 1255 retry: 1256 in6_dev_hold(idev); 1257 if (idev->cnf.use_tempaddr <= 0) { 1258 write_unlock_bh(&idev->lock); 1259 pr_info("%s: use_tempaddr is disabled\n", __func__); 1260 in6_dev_put(idev); 1261 ret = -1; 1262 goto out; 1263 } 1264 spin_lock_bh(&ifp->lock); 1265 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1266 idev->cnf.use_tempaddr = -1; /*XXX*/ 1267 spin_unlock_bh(&ifp->lock); 1268 write_unlock_bh(&idev->lock); 1269 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1270 __func__); 1271 in6_dev_put(idev); 1272 ret = -1; 1273 goto out; 1274 } 1275 in6_ifa_hold(ifp); 1276 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1277 ipv6_try_regen_rndid(idev, tmpaddr); 1278 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1279 age = (now - ifp->tstamp) / HZ; 1280 1281 regen_advance = idev->cnf.regen_max_retry * 1282 idev->cnf.dad_transmits * 1283 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1284 1285 /* recalculate max_desync_factor each time and update 1286 * idev->desync_factor if it's larger 1287 */ 1288 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1289 max_desync_factor = min_t(__u32, 1290 idev->cnf.max_desync_factor, 1291 cnf_temp_preferred_lft - regen_advance); 1292 1293 if (unlikely(idev->desync_factor > max_desync_factor)) { 1294 if (max_desync_factor > 0) { 1295 get_random_bytes(&idev->desync_factor, 1296 sizeof(idev->desync_factor)); 1297 idev->desync_factor %= max_desync_factor; 1298 } else { 1299 idev->desync_factor = 0; 1300 } 1301 } 1302 1303 tmp_valid_lft = min_t(__u32, 1304 ifp->valid_lft, 1305 idev->cnf.temp_valid_lft + age); 1306 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1307 idev->desync_factor; 1308 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1309 tmp_plen = ifp->prefix_len; 1310 tmp_tstamp = ifp->tstamp; 1311 spin_unlock_bh(&ifp->lock); 1312 1313 write_unlock_bh(&idev->lock); 1314 1315 /* A temporary address is created only if this calculated Preferred 1316 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1317 * an implementation must not create a temporary address with a zero 1318 * Preferred Lifetime. 1319 * Use age calculation as in addrconf_verify to avoid unnecessary 1320 * temporary addresses being generated. 1321 */ 1322 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1323 if (tmp_prefered_lft <= regen_advance + age) { 1324 in6_ifa_put(ifp); 1325 in6_dev_put(idev); 1326 ret = -1; 1327 goto out; 1328 } 1329 1330 addr_flags = IFA_F_TEMPORARY; 1331 /* set in addrconf_prefix_rcv() */ 1332 if (ifp->flags & IFA_F_OPTIMISTIC) 1333 addr_flags |= IFA_F_OPTIMISTIC; 1334 1335 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1336 ipv6_addr_scope(&addr), addr_flags, 1337 tmp_valid_lft, tmp_prefered_lft); 1338 if (IS_ERR(ift)) { 1339 in6_ifa_put(ifp); 1340 in6_dev_put(idev); 1341 pr_info("%s: retry temporary address regeneration\n", __func__); 1342 tmpaddr = &addr; 1343 write_lock_bh(&idev->lock); 1344 goto retry; 1345 } 1346 1347 spin_lock_bh(&ift->lock); 1348 ift->ifpub = ifp; 1349 ift->cstamp = now; 1350 ift->tstamp = tmp_tstamp; 1351 spin_unlock_bh(&ift->lock); 1352 1353 addrconf_dad_start(ift); 1354 in6_ifa_put(ift); 1355 in6_dev_put(idev); 1356 out: 1357 return ret; 1358 } 1359 1360 /* 1361 * Choose an appropriate source address (RFC3484) 1362 */ 1363 enum { 1364 IPV6_SADDR_RULE_INIT = 0, 1365 IPV6_SADDR_RULE_LOCAL, 1366 IPV6_SADDR_RULE_SCOPE, 1367 IPV6_SADDR_RULE_PREFERRED, 1368 #ifdef CONFIG_IPV6_MIP6 1369 IPV6_SADDR_RULE_HOA, 1370 #endif 1371 IPV6_SADDR_RULE_OIF, 1372 IPV6_SADDR_RULE_LABEL, 1373 IPV6_SADDR_RULE_PRIVACY, 1374 IPV6_SADDR_RULE_ORCHID, 1375 IPV6_SADDR_RULE_PREFIX, 1376 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1377 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1378 #endif 1379 IPV6_SADDR_RULE_MAX 1380 }; 1381 1382 struct ipv6_saddr_score { 1383 int rule; 1384 int addr_type; 1385 struct inet6_ifaddr *ifa; 1386 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1387 int scopedist; 1388 int matchlen; 1389 }; 1390 1391 struct ipv6_saddr_dst { 1392 const struct in6_addr *addr; 1393 int ifindex; 1394 int scope; 1395 int label; 1396 unsigned int prefs; 1397 }; 1398 1399 static inline int ipv6_saddr_preferred(int type) 1400 { 1401 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1402 return 1; 1403 return 0; 1404 } 1405 1406 static bool ipv6_use_optimistic_addr(struct net *net, 1407 struct inet6_dev *idev) 1408 { 1409 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1410 if (!idev) 1411 return false; 1412 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1413 return false; 1414 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1415 return false; 1416 1417 return true; 1418 #else 1419 return false; 1420 #endif 1421 } 1422 1423 static int ipv6_get_saddr_eval(struct net *net, 1424 struct ipv6_saddr_score *score, 1425 struct ipv6_saddr_dst *dst, 1426 int i) 1427 { 1428 int ret; 1429 1430 if (i <= score->rule) { 1431 switch (i) { 1432 case IPV6_SADDR_RULE_SCOPE: 1433 ret = score->scopedist; 1434 break; 1435 case IPV6_SADDR_RULE_PREFIX: 1436 ret = score->matchlen; 1437 break; 1438 default: 1439 ret = !!test_bit(i, score->scorebits); 1440 } 1441 goto out; 1442 } 1443 1444 switch (i) { 1445 case IPV6_SADDR_RULE_INIT: 1446 /* Rule 0: remember if hiscore is not ready yet */ 1447 ret = !!score->ifa; 1448 break; 1449 case IPV6_SADDR_RULE_LOCAL: 1450 /* Rule 1: Prefer same address */ 1451 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1452 break; 1453 case IPV6_SADDR_RULE_SCOPE: 1454 /* Rule 2: Prefer appropriate scope 1455 * 1456 * ret 1457 * ^ 1458 * -1 | d 15 1459 * ---+--+-+---> scope 1460 * | 1461 * | d is scope of the destination. 1462 * B-d | \ 1463 * | \ <- smaller scope is better if 1464 * B-15 | \ if scope is enough for destination. 1465 * | ret = B - scope (-1 <= scope >= d <= 15). 1466 * d-C-1 | / 1467 * |/ <- greater is better 1468 * -C / if scope is not enough for destination. 1469 * /| ret = scope - C (-1 <= d < scope <= 15). 1470 * 1471 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1472 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1473 * Assume B = 0 and we get C > 29. 1474 */ 1475 ret = __ipv6_addr_src_scope(score->addr_type); 1476 if (ret >= dst->scope) 1477 ret = -ret; 1478 else 1479 ret -= 128; /* 30 is enough */ 1480 score->scopedist = ret; 1481 break; 1482 case IPV6_SADDR_RULE_PREFERRED: 1483 { 1484 /* Rule 3: Avoid deprecated and optimistic addresses */ 1485 u8 avoid = IFA_F_DEPRECATED; 1486 1487 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1488 avoid |= IFA_F_OPTIMISTIC; 1489 ret = ipv6_saddr_preferred(score->addr_type) || 1490 !(score->ifa->flags & avoid); 1491 break; 1492 } 1493 #ifdef CONFIG_IPV6_MIP6 1494 case IPV6_SADDR_RULE_HOA: 1495 { 1496 /* Rule 4: Prefer home address */ 1497 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1498 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1499 break; 1500 } 1501 #endif 1502 case IPV6_SADDR_RULE_OIF: 1503 /* Rule 5: Prefer outgoing interface */ 1504 ret = (!dst->ifindex || 1505 dst->ifindex == score->ifa->idev->dev->ifindex); 1506 break; 1507 case IPV6_SADDR_RULE_LABEL: 1508 /* Rule 6: Prefer matching label */ 1509 ret = ipv6_addr_label(net, 1510 &score->ifa->addr, score->addr_type, 1511 score->ifa->idev->dev->ifindex) == dst->label; 1512 break; 1513 case IPV6_SADDR_RULE_PRIVACY: 1514 { 1515 /* Rule 7: Prefer public address 1516 * Note: prefer temporary address if use_tempaddr >= 2 1517 */ 1518 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1519 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1520 score->ifa->idev->cnf.use_tempaddr >= 2; 1521 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1522 break; 1523 } 1524 case IPV6_SADDR_RULE_ORCHID: 1525 /* Rule 8-: Prefer ORCHID vs ORCHID or 1526 * non-ORCHID vs non-ORCHID 1527 */ 1528 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1529 ipv6_addr_orchid(dst->addr)); 1530 break; 1531 case IPV6_SADDR_RULE_PREFIX: 1532 /* Rule 8: Use longest matching prefix */ 1533 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1534 if (ret > score->ifa->prefix_len) 1535 ret = score->ifa->prefix_len; 1536 score->matchlen = ret; 1537 break; 1538 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1539 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1540 /* Optimistic addresses still have lower precedence than other 1541 * preferred addresses. 1542 */ 1543 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1544 break; 1545 #endif 1546 default: 1547 ret = 0; 1548 } 1549 1550 if (ret) 1551 __set_bit(i, score->scorebits); 1552 score->rule = i; 1553 out: 1554 return ret; 1555 } 1556 1557 static int __ipv6_dev_get_saddr(struct net *net, 1558 struct ipv6_saddr_dst *dst, 1559 struct inet6_dev *idev, 1560 struct ipv6_saddr_score *scores, 1561 int hiscore_idx) 1562 { 1563 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1564 1565 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1566 int i; 1567 1568 /* 1569 * - Tentative Address (RFC2462 section 5.4) 1570 * - A tentative address is not considered 1571 * "assigned to an interface" in the traditional 1572 * sense, unless it is also flagged as optimistic. 1573 * - Candidate Source Address (section 4) 1574 * - In any case, anycast addresses, multicast 1575 * addresses, and the unspecified address MUST 1576 * NOT be included in a candidate set. 1577 */ 1578 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1579 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1580 continue; 1581 1582 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1583 1584 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1585 score->addr_type & IPV6_ADDR_MULTICAST)) { 1586 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1587 idev->dev->name); 1588 continue; 1589 } 1590 1591 score->rule = -1; 1592 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1593 1594 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1595 int minihiscore, miniscore; 1596 1597 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1598 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1599 1600 if (minihiscore > miniscore) { 1601 if (i == IPV6_SADDR_RULE_SCOPE && 1602 score->scopedist > 0) { 1603 /* 1604 * special case: 1605 * each remaining entry 1606 * has too small (not enough) 1607 * scope, because ifa entries 1608 * are sorted by their scope 1609 * values. 1610 */ 1611 goto out; 1612 } 1613 break; 1614 } else if (minihiscore < miniscore) { 1615 swap(hiscore, score); 1616 hiscore_idx = 1 - hiscore_idx; 1617 1618 /* restore our iterator */ 1619 score->ifa = hiscore->ifa; 1620 1621 break; 1622 } 1623 } 1624 } 1625 out: 1626 return hiscore_idx; 1627 } 1628 1629 static int ipv6_get_saddr_master(struct net *net, 1630 const struct net_device *dst_dev, 1631 const struct net_device *master, 1632 struct ipv6_saddr_dst *dst, 1633 struct ipv6_saddr_score *scores, 1634 int hiscore_idx) 1635 { 1636 struct inet6_dev *idev; 1637 1638 idev = __in6_dev_get(dst_dev); 1639 if (idev) 1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1641 scores, hiscore_idx); 1642 1643 idev = __in6_dev_get(master); 1644 if (idev) 1645 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1646 scores, hiscore_idx); 1647 1648 return hiscore_idx; 1649 } 1650 1651 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1652 const struct in6_addr *daddr, unsigned int prefs, 1653 struct in6_addr *saddr) 1654 { 1655 struct ipv6_saddr_score scores[2], *hiscore; 1656 struct ipv6_saddr_dst dst; 1657 struct inet6_dev *idev; 1658 struct net_device *dev; 1659 int dst_type; 1660 bool use_oif_addr = false; 1661 int hiscore_idx = 0; 1662 int ret = 0; 1663 1664 dst_type = __ipv6_addr_type(daddr); 1665 dst.addr = daddr; 1666 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1667 dst.scope = __ipv6_addr_src_scope(dst_type); 1668 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1669 dst.prefs = prefs; 1670 1671 scores[hiscore_idx].rule = -1; 1672 scores[hiscore_idx].ifa = NULL; 1673 1674 rcu_read_lock(); 1675 1676 /* Candidate Source Address (section 4) 1677 * - multicast and link-local destination address, 1678 * the set of candidate source address MUST only 1679 * include addresses assigned to interfaces 1680 * belonging to the same link as the outgoing 1681 * interface. 1682 * (- For site-local destination addresses, the 1683 * set of candidate source addresses MUST only 1684 * include addresses assigned to interfaces 1685 * belonging to the same site as the outgoing 1686 * interface.) 1687 * - "It is RECOMMENDED that the candidate source addresses 1688 * be the set of unicast addresses assigned to the 1689 * interface that will be used to send to the destination 1690 * (the 'outgoing' interface)." (RFC 6724) 1691 */ 1692 if (dst_dev) { 1693 idev = __in6_dev_get(dst_dev); 1694 if ((dst_type & IPV6_ADDR_MULTICAST) || 1695 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1696 (idev && idev->cnf.use_oif_addrs_only)) { 1697 use_oif_addr = true; 1698 } 1699 } 1700 1701 if (use_oif_addr) { 1702 if (idev) 1703 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1704 } else { 1705 const struct net_device *master; 1706 int master_idx = 0; 1707 1708 /* if dst_dev exists and is enslaved to an L3 device, then 1709 * prefer addresses from dst_dev and then the master over 1710 * any other enslaved devices in the L3 domain. 1711 */ 1712 master = l3mdev_master_dev_rcu(dst_dev); 1713 if (master) { 1714 master_idx = master->ifindex; 1715 1716 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1717 master, &dst, 1718 scores, hiscore_idx); 1719 1720 if (scores[hiscore_idx].ifa) 1721 goto out; 1722 } 1723 1724 for_each_netdev_rcu(net, dev) { 1725 /* only consider addresses on devices in the 1726 * same L3 domain 1727 */ 1728 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1729 continue; 1730 idev = __in6_dev_get(dev); 1731 if (!idev) 1732 continue; 1733 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1734 } 1735 } 1736 1737 out: 1738 hiscore = &scores[hiscore_idx]; 1739 if (!hiscore->ifa) 1740 ret = -EADDRNOTAVAIL; 1741 else 1742 *saddr = hiscore->ifa->addr; 1743 1744 rcu_read_unlock(); 1745 return ret; 1746 } 1747 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1748 1749 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1750 u32 banned_flags) 1751 { 1752 struct inet6_ifaddr *ifp; 1753 int err = -EADDRNOTAVAIL; 1754 1755 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1756 if (ifp->scope > IFA_LINK) 1757 break; 1758 if (ifp->scope == IFA_LINK && 1759 !(ifp->flags & banned_flags)) { 1760 *addr = ifp->addr; 1761 err = 0; 1762 break; 1763 } 1764 } 1765 return err; 1766 } 1767 1768 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1769 u32 banned_flags) 1770 { 1771 struct inet6_dev *idev; 1772 int err = -EADDRNOTAVAIL; 1773 1774 rcu_read_lock(); 1775 idev = __in6_dev_get(dev); 1776 if (idev) { 1777 read_lock_bh(&idev->lock); 1778 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1779 read_unlock_bh(&idev->lock); 1780 } 1781 rcu_read_unlock(); 1782 return err; 1783 } 1784 1785 static int ipv6_count_addresses(const struct inet6_dev *idev) 1786 { 1787 const struct inet6_ifaddr *ifp; 1788 int cnt = 0; 1789 1790 rcu_read_lock(); 1791 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1792 cnt++; 1793 rcu_read_unlock(); 1794 return cnt; 1795 } 1796 1797 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1798 const struct net_device *dev, int strict) 1799 { 1800 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1801 } 1802 EXPORT_SYMBOL(ipv6_chk_addr); 1803 1804 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1805 const struct net_device *dev, int strict, 1806 u32 banned_flags) 1807 { 1808 struct inet6_ifaddr *ifp; 1809 unsigned int hash = inet6_addr_hash(addr); 1810 u32 ifp_flags; 1811 1812 rcu_read_lock_bh(); 1813 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1814 if (!net_eq(dev_net(ifp->idev->dev), net)) 1815 continue; 1816 /* Decouple optimistic from tentative for evaluation here. 1817 * Ban optimistic addresses explicitly, when required. 1818 */ 1819 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1820 ? (ifp->flags&~IFA_F_TENTATIVE) 1821 : ifp->flags; 1822 if (ipv6_addr_equal(&ifp->addr, addr) && 1823 !(ifp_flags&banned_flags) && 1824 (!dev || ifp->idev->dev == dev || 1825 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1826 rcu_read_unlock_bh(); 1827 return 1; 1828 } 1829 } 1830 1831 rcu_read_unlock_bh(); 1832 return 0; 1833 } 1834 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1835 1836 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1837 struct net_device *dev) 1838 { 1839 unsigned int hash = inet6_addr_hash(addr); 1840 struct inet6_ifaddr *ifp; 1841 1842 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1843 if (!net_eq(dev_net(ifp->idev->dev), net)) 1844 continue; 1845 if (ipv6_addr_equal(&ifp->addr, addr)) { 1846 if (!dev || ifp->idev->dev == dev) 1847 return true; 1848 } 1849 } 1850 return false; 1851 } 1852 1853 /* Compares an address/prefix_len with addresses on device @dev. 1854 * If one is found it returns true. 1855 */ 1856 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1857 const unsigned int prefix_len, struct net_device *dev) 1858 { 1859 const struct inet6_ifaddr *ifa; 1860 const struct inet6_dev *idev; 1861 bool ret = false; 1862 1863 rcu_read_lock(); 1864 idev = __in6_dev_get(dev); 1865 if (idev) { 1866 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1867 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1868 if (ret) 1869 break; 1870 } 1871 } 1872 rcu_read_unlock(); 1873 1874 return ret; 1875 } 1876 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1877 1878 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1879 { 1880 const struct inet6_ifaddr *ifa; 1881 const struct inet6_dev *idev; 1882 int onlink; 1883 1884 onlink = 0; 1885 rcu_read_lock(); 1886 idev = __in6_dev_get(dev); 1887 if (idev) { 1888 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1889 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1890 ifa->prefix_len); 1891 if (onlink) 1892 break; 1893 } 1894 } 1895 rcu_read_unlock(); 1896 return onlink; 1897 } 1898 EXPORT_SYMBOL(ipv6_chk_prefix); 1899 1900 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1901 struct net_device *dev, int strict) 1902 { 1903 struct inet6_ifaddr *ifp, *result = NULL; 1904 unsigned int hash = inet6_addr_hash(addr); 1905 1906 rcu_read_lock_bh(); 1907 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1908 if (!net_eq(dev_net(ifp->idev->dev), net)) 1909 continue; 1910 if (ipv6_addr_equal(&ifp->addr, addr)) { 1911 if (!dev || ifp->idev->dev == dev || 1912 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1913 result = ifp; 1914 in6_ifa_hold(ifp); 1915 break; 1916 } 1917 } 1918 } 1919 rcu_read_unlock_bh(); 1920 1921 return result; 1922 } 1923 1924 /* Gets referenced address, destroys ifaddr */ 1925 1926 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1927 { 1928 if (dad_failed) 1929 ifp->flags |= IFA_F_DADFAILED; 1930 1931 if (ifp->flags&IFA_F_TEMPORARY) { 1932 struct inet6_ifaddr *ifpub; 1933 spin_lock_bh(&ifp->lock); 1934 ifpub = ifp->ifpub; 1935 if (ifpub) { 1936 in6_ifa_hold(ifpub); 1937 spin_unlock_bh(&ifp->lock); 1938 ipv6_create_tempaddr(ifpub, ifp); 1939 in6_ifa_put(ifpub); 1940 } else { 1941 spin_unlock_bh(&ifp->lock); 1942 } 1943 ipv6_del_addr(ifp); 1944 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1945 spin_lock_bh(&ifp->lock); 1946 addrconf_del_dad_work(ifp); 1947 ifp->flags |= IFA_F_TENTATIVE; 1948 spin_unlock_bh(&ifp->lock); 1949 if (dad_failed) 1950 ipv6_ifa_notify(0, ifp); 1951 in6_ifa_put(ifp); 1952 } else { 1953 ipv6_del_addr(ifp); 1954 } 1955 } 1956 1957 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1958 { 1959 int err = -ENOENT; 1960 1961 spin_lock_bh(&ifp->lock); 1962 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1963 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1964 err = 0; 1965 } 1966 spin_unlock_bh(&ifp->lock); 1967 1968 return err; 1969 } 1970 1971 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1972 { 1973 struct inet6_dev *idev = ifp->idev; 1974 struct net *net = dev_net(ifp->idev->dev); 1975 1976 if (addrconf_dad_end(ifp)) { 1977 in6_ifa_put(ifp); 1978 return; 1979 } 1980 1981 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1982 ifp->idev->dev->name, &ifp->addr); 1983 1984 spin_lock_bh(&ifp->lock); 1985 1986 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1987 int scope = ifp->scope; 1988 u32 flags = ifp->flags; 1989 struct in6_addr new_addr; 1990 struct inet6_ifaddr *ifp2; 1991 u32 valid_lft, preferred_lft; 1992 int pfxlen = ifp->prefix_len; 1993 int retries = ifp->stable_privacy_retry + 1; 1994 1995 if (retries > net->ipv6.sysctl.idgen_retries) { 1996 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1997 ifp->idev->dev->name); 1998 goto errdad; 1999 } 2000 2001 new_addr = ifp->addr; 2002 if (ipv6_generate_stable_address(&new_addr, retries, 2003 idev)) 2004 goto errdad; 2005 2006 valid_lft = ifp->valid_lft; 2007 preferred_lft = ifp->prefered_lft; 2008 2009 spin_unlock_bh(&ifp->lock); 2010 2011 if (idev->cnf.max_addresses && 2012 ipv6_count_addresses(idev) >= 2013 idev->cnf.max_addresses) 2014 goto lock_errdad; 2015 2016 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2017 ifp->idev->dev->name); 2018 2019 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2020 scope, flags, valid_lft, 2021 preferred_lft); 2022 if (IS_ERR(ifp2)) 2023 goto lock_errdad; 2024 2025 spin_lock_bh(&ifp2->lock); 2026 ifp2->stable_privacy_retry = retries; 2027 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2028 spin_unlock_bh(&ifp2->lock); 2029 2030 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2031 in6_ifa_put(ifp2); 2032 lock_errdad: 2033 spin_lock_bh(&ifp->lock); 2034 } 2035 2036 errdad: 2037 /* transition from _POSTDAD to _ERRDAD */ 2038 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2039 spin_unlock_bh(&ifp->lock); 2040 2041 addrconf_mod_dad_work(ifp, 0); 2042 in6_ifa_put(ifp); 2043 } 2044 2045 /* Join to solicited addr multicast group. 2046 * caller must hold RTNL */ 2047 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2048 { 2049 struct in6_addr maddr; 2050 2051 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2052 return; 2053 2054 addrconf_addr_solict_mult(addr, &maddr); 2055 ipv6_dev_mc_inc(dev, &maddr); 2056 } 2057 2058 /* caller must hold RTNL */ 2059 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2060 { 2061 struct in6_addr maddr; 2062 2063 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2064 return; 2065 2066 addrconf_addr_solict_mult(addr, &maddr); 2067 __ipv6_dev_mc_dec(idev, &maddr); 2068 } 2069 2070 /* caller must hold RTNL */ 2071 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2072 { 2073 struct in6_addr addr; 2074 2075 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2076 return; 2077 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2078 if (ipv6_addr_any(&addr)) 2079 return; 2080 __ipv6_dev_ac_inc(ifp->idev, &addr); 2081 } 2082 2083 /* caller must hold RTNL */ 2084 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2085 { 2086 struct in6_addr addr; 2087 2088 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2089 return; 2090 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2091 if (ipv6_addr_any(&addr)) 2092 return; 2093 __ipv6_dev_ac_dec(ifp->idev, &addr); 2094 } 2095 2096 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2097 { 2098 switch (dev->addr_len) { 2099 case ETH_ALEN: 2100 memcpy(eui, dev->dev_addr, 3); 2101 eui[3] = 0xFF; 2102 eui[4] = 0xFE; 2103 memcpy(eui + 5, dev->dev_addr + 3, 3); 2104 break; 2105 case EUI64_ADDR_LEN: 2106 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2107 eui[0] ^= 2; 2108 break; 2109 default: 2110 return -1; 2111 } 2112 2113 return 0; 2114 } 2115 2116 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2117 { 2118 union fwnet_hwaddr *ha; 2119 2120 if (dev->addr_len != FWNET_ALEN) 2121 return -1; 2122 2123 ha = (union fwnet_hwaddr *)dev->dev_addr; 2124 2125 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2126 eui[0] ^= 2; 2127 return 0; 2128 } 2129 2130 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2131 { 2132 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2133 if (dev->addr_len != ARCNET_ALEN) 2134 return -1; 2135 memset(eui, 0, 7); 2136 eui[7] = *(u8 *)dev->dev_addr; 2137 return 0; 2138 } 2139 2140 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2141 { 2142 if (dev->addr_len != INFINIBAND_ALEN) 2143 return -1; 2144 memcpy(eui, dev->dev_addr + 12, 8); 2145 eui[0] |= 2; 2146 return 0; 2147 } 2148 2149 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2150 { 2151 if (addr == 0) 2152 return -1; 2153 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2154 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2155 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2156 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2157 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2158 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2159 eui[1] = 0; 2160 eui[2] = 0x5E; 2161 eui[3] = 0xFE; 2162 memcpy(eui + 4, &addr, 4); 2163 return 0; 2164 } 2165 2166 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2167 { 2168 if (dev->priv_flags & IFF_ISATAP) 2169 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2170 return -1; 2171 } 2172 2173 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2174 { 2175 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2176 } 2177 2178 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2179 { 2180 memcpy(eui, dev->perm_addr, 3); 2181 memcpy(eui + 5, dev->perm_addr + 3, 3); 2182 eui[3] = 0xFF; 2183 eui[4] = 0xFE; 2184 eui[0] ^= 2; 2185 return 0; 2186 } 2187 2188 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2189 { 2190 switch (dev->type) { 2191 case ARPHRD_ETHER: 2192 case ARPHRD_FDDI: 2193 return addrconf_ifid_eui48(eui, dev); 2194 case ARPHRD_ARCNET: 2195 return addrconf_ifid_arcnet(eui, dev); 2196 case ARPHRD_INFINIBAND: 2197 return addrconf_ifid_infiniband(eui, dev); 2198 case ARPHRD_SIT: 2199 return addrconf_ifid_sit(eui, dev); 2200 case ARPHRD_IPGRE: 2201 case ARPHRD_TUNNEL: 2202 return addrconf_ifid_gre(eui, dev); 2203 case ARPHRD_6LOWPAN: 2204 return addrconf_ifid_6lowpan(eui, dev); 2205 case ARPHRD_IEEE1394: 2206 return addrconf_ifid_ieee1394(eui, dev); 2207 case ARPHRD_TUNNEL6: 2208 case ARPHRD_IP6GRE: 2209 return addrconf_ifid_ip6tnl(eui, dev); 2210 } 2211 return -1; 2212 } 2213 2214 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2215 { 2216 int err = -1; 2217 struct inet6_ifaddr *ifp; 2218 2219 read_lock_bh(&idev->lock); 2220 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2221 if (ifp->scope > IFA_LINK) 2222 break; 2223 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2224 memcpy(eui, ifp->addr.s6_addr+8, 8); 2225 err = 0; 2226 break; 2227 } 2228 } 2229 read_unlock_bh(&idev->lock); 2230 return err; 2231 } 2232 2233 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2234 static void ipv6_regen_rndid(struct inet6_dev *idev) 2235 { 2236 regen: 2237 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2238 idev->rndid[0] &= ~0x02; 2239 2240 /* 2241 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2242 * check if generated address is not inappropriate 2243 * 2244 * - Reserved subnet anycast (RFC 2526) 2245 * 11111101 11....11 1xxxxxxx 2246 * - ISATAP (RFC4214) 6.1 2247 * 00-00-5E-FE-xx-xx-xx-xx 2248 * - value 0 2249 * - XXX: already assigned to an address on the device 2250 */ 2251 if (idev->rndid[0] == 0xfd && 2252 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2253 (idev->rndid[7]&0x80)) 2254 goto regen; 2255 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2256 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2257 goto regen; 2258 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2259 goto regen; 2260 } 2261 } 2262 2263 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2264 { 2265 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2266 ipv6_regen_rndid(idev); 2267 } 2268 2269 /* 2270 * Add prefix route. 2271 */ 2272 2273 static void 2274 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2275 unsigned long expires, u32 flags) 2276 { 2277 struct fib6_config cfg = { 2278 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2279 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2280 .fc_ifindex = dev->ifindex, 2281 .fc_expires = expires, 2282 .fc_dst_len = plen, 2283 .fc_flags = RTF_UP | flags, 2284 .fc_nlinfo.nl_net = dev_net(dev), 2285 .fc_protocol = RTPROT_KERNEL, 2286 }; 2287 2288 cfg.fc_dst = *pfx; 2289 2290 /* Prevent useless cloning on PtP SIT. 2291 This thing is done here expecting that the whole 2292 class of non-broadcast devices need not cloning. 2293 */ 2294 #if IS_ENABLED(CONFIG_IPV6_SIT) 2295 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2296 cfg.fc_flags |= RTF_NONEXTHOP; 2297 #endif 2298 2299 ip6_route_add(&cfg, NULL); 2300 } 2301 2302 2303 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2304 int plen, 2305 const struct net_device *dev, 2306 u32 flags, u32 noflags) 2307 { 2308 struct fib6_node *fn; 2309 struct rt6_info *rt = NULL; 2310 struct fib6_table *table; 2311 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2312 2313 table = fib6_get_table(dev_net(dev), tb_id); 2314 if (!table) 2315 return NULL; 2316 2317 rcu_read_lock(); 2318 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2319 if (!fn) 2320 goto out; 2321 2322 for_each_fib6_node_rt_rcu(fn) { 2323 if (rt->dst.dev->ifindex != dev->ifindex) 2324 continue; 2325 if ((rt->rt6i_flags & flags) != flags) 2326 continue; 2327 if ((rt->rt6i_flags & noflags) != 0) 2328 continue; 2329 if (!dst_hold_safe(&rt->dst)) 2330 rt = NULL; 2331 break; 2332 } 2333 out: 2334 rcu_read_unlock(); 2335 return rt; 2336 } 2337 2338 2339 /* Create "default" multicast route to the interface */ 2340 2341 static void addrconf_add_mroute(struct net_device *dev) 2342 { 2343 struct fib6_config cfg = { 2344 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2345 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2346 .fc_ifindex = dev->ifindex, 2347 .fc_dst_len = 8, 2348 .fc_flags = RTF_UP, 2349 .fc_nlinfo.nl_net = dev_net(dev), 2350 }; 2351 2352 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2353 2354 ip6_route_add(&cfg, NULL); 2355 } 2356 2357 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2358 { 2359 struct inet6_dev *idev; 2360 2361 ASSERT_RTNL(); 2362 2363 idev = ipv6_find_idev(dev); 2364 if (!idev) 2365 return ERR_PTR(-ENOBUFS); 2366 2367 if (idev->cnf.disable_ipv6) 2368 return ERR_PTR(-EACCES); 2369 2370 /* Add default multicast route */ 2371 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2372 addrconf_add_mroute(dev); 2373 2374 return idev; 2375 } 2376 2377 static void manage_tempaddrs(struct inet6_dev *idev, 2378 struct inet6_ifaddr *ifp, 2379 __u32 valid_lft, __u32 prefered_lft, 2380 bool create, unsigned long now) 2381 { 2382 u32 flags; 2383 struct inet6_ifaddr *ift; 2384 2385 read_lock_bh(&idev->lock); 2386 /* update all temporary addresses in the list */ 2387 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2388 int age, max_valid, max_prefered; 2389 2390 if (ifp != ift->ifpub) 2391 continue; 2392 2393 /* RFC 4941 section 3.3: 2394 * If a received option will extend the lifetime of a public 2395 * address, the lifetimes of temporary addresses should 2396 * be extended, subject to the overall constraint that no 2397 * temporary addresses should ever remain "valid" or "preferred" 2398 * for a time longer than (TEMP_VALID_LIFETIME) or 2399 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2400 */ 2401 age = (now - ift->cstamp) / HZ; 2402 max_valid = idev->cnf.temp_valid_lft - age; 2403 if (max_valid < 0) 2404 max_valid = 0; 2405 2406 max_prefered = idev->cnf.temp_prefered_lft - 2407 idev->desync_factor - age; 2408 if (max_prefered < 0) 2409 max_prefered = 0; 2410 2411 if (valid_lft > max_valid) 2412 valid_lft = max_valid; 2413 2414 if (prefered_lft > max_prefered) 2415 prefered_lft = max_prefered; 2416 2417 spin_lock(&ift->lock); 2418 flags = ift->flags; 2419 ift->valid_lft = valid_lft; 2420 ift->prefered_lft = prefered_lft; 2421 ift->tstamp = now; 2422 if (prefered_lft > 0) 2423 ift->flags &= ~IFA_F_DEPRECATED; 2424 2425 spin_unlock(&ift->lock); 2426 if (!(flags&IFA_F_TENTATIVE)) 2427 ipv6_ifa_notify(0, ift); 2428 } 2429 2430 if ((create || list_empty(&idev->tempaddr_list)) && 2431 idev->cnf.use_tempaddr > 0) { 2432 /* When a new public address is created as described 2433 * in [ADDRCONF], also create a new temporary address. 2434 * Also create a temporary address if it's enabled but 2435 * no temporary address currently exists. 2436 */ 2437 read_unlock_bh(&idev->lock); 2438 ipv6_create_tempaddr(ifp, NULL); 2439 } else { 2440 read_unlock_bh(&idev->lock); 2441 } 2442 } 2443 2444 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2445 { 2446 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2447 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2448 } 2449 2450 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2451 const struct prefix_info *pinfo, 2452 struct inet6_dev *in6_dev, 2453 const struct in6_addr *addr, int addr_type, 2454 u32 addr_flags, bool sllao, bool tokenized, 2455 __u32 valid_lft, u32 prefered_lft) 2456 { 2457 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2458 int create = 0, update_lft = 0; 2459 2460 if (!ifp && valid_lft) { 2461 int max_addresses = in6_dev->cnf.max_addresses; 2462 2463 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2464 if ((net->ipv6.devconf_all->optimistic_dad || 2465 in6_dev->cnf.optimistic_dad) && 2466 !net->ipv6.devconf_all->forwarding && sllao) 2467 addr_flags |= IFA_F_OPTIMISTIC; 2468 #endif 2469 2470 /* Do not allow to create too much of autoconfigured 2471 * addresses; this would be too easy way to crash kernel. 2472 */ 2473 if (!max_addresses || 2474 ipv6_count_addresses(in6_dev) < max_addresses) 2475 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2476 pinfo->prefix_len, 2477 addr_type&IPV6_ADDR_SCOPE_MASK, 2478 addr_flags, valid_lft, 2479 prefered_lft); 2480 2481 if (IS_ERR_OR_NULL(ifp)) 2482 return -1; 2483 2484 update_lft = 0; 2485 create = 1; 2486 spin_lock_bh(&ifp->lock); 2487 ifp->flags |= IFA_F_MANAGETEMPADDR; 2488 ifp->cstamp = jiffies; 2489 ifp->tokenized = tokenized; 2490 spin_unlock_bh(&ifp->lock); 2491 addrconf_dad_start(ifp); 2492 } 2493 2494 if (ifp) { 2495 u32 flags; 2496 unsigned long now; 2497 u32 stored_lft; 2498 2499 /* update lifetime (RFC2462 5.5.3 e) */ 2500 spin_lock_bh(&ifp->lock); 2501 now = jiffies; 2502 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2503 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2504 else 2505 stored_lft = 0; 2506 if (!update_lft && !create && stored_lft) { 2507 const u32 minimum_lft = min_t(u32, 2508 stored_lft, MIN_VALID_LIFETIME); 2509 valid_lft = max(valid_lft, minimum_lft); 2510 2511 /* RFC4862 Section 5.5.3e: 2512 * "Note that the preferred lifetime of the 2513 * corresponding address is always reset to 2514 * the Preferred Lifetime in the received 2515 * Prefix Information option, regardless of 2516 * whether the valid lifetime is also reset or 2517 * ignored." 2518 * 2519 * So we should always update prefered_lft here. 2520 */ 2521 update_lft = 1; 2522 } 2523 2524 if (update_lft) { 2525 ifp->valid_lft = valid_lft; 2526 ifp->prefered_lft = prefered_lft; 2527 ifp->tstamp = now; 2528 flags = ifp->flags; 2529 ifp->flags &= ~IFA_F_DEPRECATED; 2530 spin_unlock_bh(&ifp->lock); 2531 2532 if (!(flags&IFA_F_TENTATIVE)) 2533 ipv6_ifa_notify(0, ifp); 2534 } else 2535 spin_unlock_bh(&ifp->lock); 2536 2537 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2538 create, now); 2539 2540 in6_ifa_put(ifp); 2541 addrconf_verify(); 2542 } 2543 2544 return 0; 2545 } 2546 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2547 2548 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2549 { 2550 struct prefix_info *pinfo; 2551 __u32 valid_lft; 2552 __u32 prefered_lft; 2553 int addr_type, err; 2554 u32 addr_flags = 0; 2555 struct inet6_dev *in6_dev; 2556 struct net *net = dev_net(dev); 2557 2558 pinfo = (struct prefix_info *) opt; 2559 2560 if (len < sizeof(struct prefix_info)) { 2561 ADBG("addrconf: prefix option too short\n"); 2562 return; 2563 } 2564 2565 /* 2566 * Validation checks ([ADDRCONF], page 19) 2567 */ 2568 2569 addr_type = ipv6_addr_type(&pinfo->prefix); 2570 2571 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2572 return; 2573 2574 valid_lft = ntohl(pinfo->valid); 2575 prefered_lft = ntohl(pinfo->prefered); 2576 2577 if (prefered_lft > valid_lft) { 2578 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2579 return; 2580 } 2581 2582 in6_dev = in6_dev_get(dev); 2583 2584 if (!in6_dev) { 2585 net_dbg_ratelimited("addrconf: device %s not configured\n", 2586 dev->name); 2587 return; 2588 } 2589 2590 /* 2591 * Two things going on here: 2592 * 1) Add routes for on-link prefixes 2593 * 2) Configure prefixes with the auto flag set 2594 */ 2595 2596 if (pinfo->onlink) { 2597 struct rt6_info *rt; 2598 unsigned long rt_expires; 2599 2600 /* Avoid arithmetic overflow. Really, we could 2601 * save rt_expires in seconds, likely valid_lft, 2602 * but it would require division in fib gc, that it 2603 * not good. 2604 */ 2605 if (HZ > USER_HZ) 2606 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2607 else 2608 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2609 2610 if (addrconf_finite_timeout(rt_expires)) 2611 rt_expires *= HZ; 2612 2613 rt = addrconf_get_prefix_route(&pinfo->prefix, 2614 pinfo->prefix_len, 2615 dev, 2616 RTF_ADDRCONF | RTF_PREFIX_RT, 2617 RTF_GATEWAY | RTF_DEFAULT); 2618 2619 if (rt) { 2620 /* Autoconf prefix route */ 2621 if (valid_lft == 0) { 2622 ip6_del_rt(rt); 2623 rt = NULL; 2624 } else if (addrconf_finite_timeout(rt_expires)) { 2625 /* not infinity */ 2626 rt6_set_expires(rt, jiffies + rt_expires); 2627 } else { 2628 rt6_clean_expires(rt); 2629 } 2630 } else if (valid_lft) { 2631 clock_t expires = 0; 2632 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2633 if (addrconf_finite_timeout(rt_expires)) { 2634 /* not infinity */ 2635 flags |= RTF_EXPIRES; 2636 expires = jiffies_to_clock_t(rt_expires); 2637 } 2638 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2639 dev, expires, flags); 2640 } 2641 ip6_rt_put(rt); 2642 } 2643 2644 /* Try to figure out our local address for this prefix */ 2645 2646 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2647 struct in6_addr addr; 2648 bool tokenized = false, dev_addr_generated = false; 2649 2650 if (pinfo->prefix_len == 64) { 2651 memcpy(&addr, &pinfo->prefix, 8); 2652 2653 if (!ipv6_addr_any(&in6_dev->token)) { 2654 read_lock_bh(&in6_dev->lock); 2655 memcpy(addr.s6_addr + 8, 2656 in6_dev->token.s6_addr + 8, 8); 2657 read_unlock_bh(&in6_dev->lock); 2658 tokenized = true; 2659 } else if (is_addr_mode_generate_stable(in6_dev) && 2660 !ipv6_generate_stable_address(&addr, 0, 2661 in6_dev)) { 2662 addr_flags |= IFA_F_STABLE_PRIVACY; 2663 goto ok; 2664 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2665 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2666 goto put; 2667 } else { 2668 dev_addr_generated = true; 2669 } 2670 goto ok; 2671 } 2672 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2673 pinfo->prefix_len); 2674 goto put; 2675 2676 ok: 2677 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2678 &addr, addr_type, 2679 addr_flags, sllao, 2680 tokenized, valid_lft, 2681 prefered_lft); 2682 if (err) 2683 goto put; 2684 2685 /* Ignore error case here because previous prefix add addr was 2686 * successful which will be notified. 2687 */ 2688 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2689 addr_type, addr_flags, sllao, 2690 tokenized, valid_lft, 2691 prefered_lft, 2692 dev_addr_generated); 2693 } 2694 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2695 put: 2696 in6_dev_put(in6_dev); 2697 } 2698 2699 /* 2700 * Set destination address. 2701 * Special case for SIT interfaces where we create a new "virtual" 2702 * device. 2703 */ 2704 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2705 { 2706 struct in6_ifreq ireq; 2707 struct net_device *dev; 2708 int err = -EINVAL; 2709 2710 rtnl_lock(); 2711 2712 err = -EFAULT; 2713 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2714 goto err_exit; 2715 2716 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2717 2718 err = -ENODEV; 2719 if (!dev) 2720 goto err_exit; 2721 2722 #if IS_ENABLED(CONFIG_IPV6_SIT) 2723 if (dev->type == ARPHRD_SIT) { 2724 const struct net_device_ops *ops = dev->netdev_ops; 2725 struct ifreq ifr; 2726 struct ip_tunnel_parm p; 2727 2728 err = -EADDRNOTAVAIL; 2729 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2730 goto err_exit; 2731 2732 memset(&p, 0, sizeof(p)); 2733 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2734 p.iph.saddr = 0; 2735 p.iph.version = 4; 2736 p.iph.ihl = 5; 2737 p.iph.protocol = IPPROTO_IPV6; 2738 p.iph.ttl = 64; 2739 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2740 2741 if (ops->ndo_do_ioctl) { 2742 mm_segment_t oldfs = get_fs(); 2743 2744 set_fs(KERNEL_DS); 2745 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2746 set_fs(oldfs); 2747 } else 2748 err = -EOPNOTSUPP; 2749 2750 if (err == 0) { 2751 err = -ENOBUFS; 2752 dev = __dev_get_by_name(net, p.name); 2753 if (!dev) 2754 goto err_exit; 2755 err = dev_open(dev); 2756 } 2757 } 2758 #endif 2759 2760 err_exit: 2761 rtnl_unlock(); 2762 return err; 2763 } 2764 2765 static int ipv6_mc_config(struct sock *sk, bool join, 2766 const struct in6_addr *addr, int ifindex) 2767 { 2768 int ret; 2769 2770 ASSERT_RTNL(); 2771 2772 lock_sock(sk); 2773 if (join) 2774 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2775 else 2776 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2777 release_sock(sk); 2778 2779 return ret; 2780 } 2781 2782 /* 2783 * Manual configuration of address on an interface 2784 */ 2785 static int inet6_addr_add(struct net *net, int ifindex, 2786 const struct in6_addr *pfx, 2787 const struct in6_addr *peer_pfx, 2788 unsigned int plen, __u32 ifa_flags, 2789 __u32 prefered_lft, __u32 valid_lft) 2790 { 2791 struct inet6_ifaddr *ifp; 2792 struct inet6_dev *idev; 2793 struct net_device *dev; 2794 unsigned long timeout; 2795 clock_t expires; 2796 int scope; 2797 u32 flags; 2798 2799 ASSERT_RTNL(); 2800 2801 if (plen > 128) 2802 return -EINVAL; 2803 2804 /* check the lifetime */ 2805 if (!valid_lft || prefered_lft > valid_lft) 2806 return -EINVAL; 2807 2808 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2809 return -EINVAL; 2810 2811 dev = __dev_get_by_index(net, ifindex); 2812 if (!dev) 2813 return -ENODEV; 2814 2815 idev = addrconf_add_dev(dev); 2816 if (IS_ERR(idev)) 2817 return PTR_ERR(idev); 2818 2819 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2820 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2821 true, pfx, ifindex); 2822 2823 if (ret < 0) 2824 return ret; 2825 } 2826 2827 scope = ipv6_addr_scope(pfx); 2828 2829 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2830 if (addrconf_finite_timeout(timeout)) { 2831 expires = jiffies_to_clock_t(timeout * HZ); 2832 valid_lft = timeout; 2833 flags = RTF_EXPIRES; 2834 } else { 2835 expires = 0; 2836 flags = 0; 2837 ifa_flags |= IFA_F_PERMANENT; 2838 } 2839 2840 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2841 if (addrconf_finite_timeout(timeout)) { 2842 if (timeout == 0) 2843 ifa_flags |= IFA_F_DEPRECATED; 2844 prefered_lft = timeout; 2845 } 2846 2847 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2848 valid_lft, prefered_lft); 2849 2850 if (!IS_ERR(ifp)) { 2851 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2852 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2853 expires, flags); 2854 } 2855 2856 /* 2857 * Note that section 3.1 of RFC 4429 indicates 2858 * that the Optimistic flag should not be set for 2859 * manually configured addresses 2860 */ 2861 addrconf_dad_start(ifp); 2862 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2863 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2864 true, jiffies); 2865 in6_ifa_put(ifp); 2866 addrconf_verify_rtnl(); 2867 return 0; 2868 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2869 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2870 false, pfx, ifindex); 2871 } 2872 2873 return PTR_ERR(ifp); 2874 } 2875 2876 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2877 const struct in6_addr *pfx, unsigned int plen) 2878 { 2879 struct inet6_ifaddr *ifp; 2880 struct inet6_dev *idev; 2881 struct net_device *dev; 2882 2883 if (plen > 128) 2884 return -EINVAL; 2885 2886 dev = __dev_get_by_index(net, ifindex); 2887 if (!dev) 2888 return -ENODEV; 2889 2890 idev = __in6_dev_get(dev); 2891 if (!idev) 2892 return -ENXIO; 2893 2894 read_lock_bh(&idev->lock); 2895 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2896 if (ifp->prefix_len == plen && 2897 ipv6_addr_equal(pfx, &ifp->addr)) { 2898 in6_ifa_hold(ifp); 2899 read_unlock_bh(&idev->lock); 2900 2901 if (!(ifp->flags & IFA_F_TEMPORARY) && 2902 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2903 manage_tempaddrs(idev, ifp, 0, 0, false, 2904 jiffies); 2905 ipv6_del_addr(ifp); 2906 addrconf_verify_rtnl(); 2907 if (ipv6_addr_is_multicast(pfx)) { 2908 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2909 false, pfx, dev->ifindex); 2910 } 2911 return 0; 2912 } 2913 } 2914 read_unlock_bh(&idev->lock); 2915 return -EADDRNOTAVAIL; 2916 } 2917 2918 2919 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2920 { 2921 struct in6_ifreq ireq; 2922 int err; 2923 2924 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2925 return -EPERM; 2926 2927 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2928 return -EFAULT; 2929 2930 rtnl_lock(); 2931 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2932 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2933 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2934 rtnl_unlock(); 2935 return err; 2936 } 2937 2938 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2939 { 2940 struct in6_ifreq ireq; 2941 int err; 2942 2943 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2944 return -EPERM; 2945 2946 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2947 return -EFAULT; 2948 2949 rtnl_lock(); 2950 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2951 ireq.ifr6_prefixlen); 2952 rtnl_unlock(); 2953 return err; 2954 } 2955 2956 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2957 int plen, int scope) 2958 { 2959 struct inet6_ifaddr *ifp; 2960 2961 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2962 scope, IFA_F_PERMANENT, 2963 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2964 if (!IS_ERR(ifp)) { 2965 spin_lock_bh(&ifp->lock); 2966 ifp->flags &= ~IFA_F_TENTATIVE; 2967 spin_unlock_bh(&ifp->lock); 2968 rt_genid_bump_ipv6(dev_net(idev->dev)); 2969 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2970 in6_ifa_put(ifp); 2971 } 2972 } 2973 2974 #if IS_ENABLED(CONFIG_IPV6_SIT) 2975 static void sit_add_v4_addrs(struct inet6_dev *idev) 2976 { 2977 struct in6_addr addr; 2978 struct net_device *dev; 2979 struct net *net = dev_net(idev->dev); 2980 int scope, plen; 2981 u32 pflags = 0; 2982 2983 ASSERT_RTNL(); 2984 2985 memset(&addr, 0, sizeof(struct in6_addr)); 2986 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2987 2988 if (idev->dev->flags&IFF_POINTOPOINT) { 2989 addr.s6_addr32[0] = htonl(0xfe800000); 2990 scope = IFA_LINK; 2991 plen = 64; 2992 } else { 2993 scope = IPV6_ADDR_COMPATv4; 2994 plen = 96; 2995 pflags |= RTF_NONEXTHOP; 2996 } 2997 2998 if (addr.s6_addr32[3]) { 2999 add_addr(idev, &addr, plen, scope); 3000 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 3001 return; 3002 } 3003 3004 for_each_netdev(net, dev) { 3005 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3006 if (in_dev && (dev->flags & IFF_UP)) { 3007 struct in_ifaddr *ifa; 3008 3009 int flag = scope; 3010 3011 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3012 3013 addr.s6_addr32[3] = ifa->ifa_local; 3014 3015 if (ifa->ifa_scope == RT_SCOPE_LINK) 3016 continue; 3017 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3018 if (idev->dev->flags&IFF_POINTOPOINT) 3019 continue; 3020 flag |= IFA_HOST; 3021 } 3022 3023 add_addr(idev, &addr, plen, flag); 3024 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3025 pflags); 3026 } 3027 } 3028 } 3029 } 3030 #endif 3031 3032 static void init_loopback(struct net_device *dev) 3033 { 3034 struct inet6_dev *idev; 3035 3036 /* ::1 */ 3037 3038 ASSERT_RTNL(); 3039 3040 idev = ipv6_find_idev(dev); 3041 if (!idev) { 3042 pr_debug("%s: add_dev failed\n", __func__); 3043 return; 3044 } 3045 3046 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3047 } 3048 3049 void addrconf_add_linklocal(struct inet6_dev *idev, 3050 const struct in6_addr *addr, u32 flags) 3051 { 3052 struct inet6_ifaddr *ifp; 3053 u32 addr_flags = flags | IFA_F_PERMANENT; 3054 3055 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3056 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3057 idev->cnf.optimistic_dad) && 3058 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3059 addr_flags |= IFA_F_OPTIMISTIC; 3060 #endif 3061 3062 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3063 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3064 if (!IS_ERR(ifp)) { 3065 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3066 addrconf_dad_start(ifp); 3067 in6_ifa_put(ifp); 3068 } 3069 } 3070 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3071 3072 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3073 { 3074 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3075 return true; 3076 3077 if (address.s6_addr32[2] == htonl(0x02005eff) && 3078 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3079 return true; 3080 3081 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3082 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3083 return true; 3084 3085 return false; 3086 } 3087 3088 static int ipv6_generate_stable_address(struct in6_addr *address, 3089 u8 dad_count, 3090 const struct inet6_dev *idev) 3091 { 3092 static DEFINE_SPINLOCK(lock); 3093 static __u32 digest[SHA_DIGEST_WORDS]; 3094 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3095 3096 static union { 3097 char __data[SHA_MESSAGE_BYTES]; 3098 struct { 3099 struct in6_addr secret; 3100 __be32 prefix[2]; 3101 unsigned char hwaddr[MAX_ADDR_LEN]; 3102 u8 dad_count; 3103 } __packed; 3104 } data; 3105 3106 struct in6_addr secret; 3107 struct in6_addr temp; 3108 struct net *net = dev_net(idev->dev); 3109 3110 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3111 3112 if (idev->cnf.stable_secret.initialized) 3113 secret = idev->cnf.stable_secret.secret; 3114 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3115 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3116 else 3117 return -1; 3118 3119 retry: 3120 spin_lock_bh(&lock); 3121 3122 sha_init(digest); 3123 memset(&data, 0, sizeof(data)); 3124 memset(workspace, 0, sizeof(workspace)); 3125 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3126 data.prefix[0] = address->s6_addr32[0]; 3127 data.prefix[1] = address->s6_addr32[1]; 3128 data.secret = secret; 3129 data.dad_count = dad_count; 3130 3131 sha_transform(digest, data.__data, workspace); 3132 3133 temp = *address; 3134 temp.s6_addr32[2] = (__force __be32)digest[0]; 3135 temp.s6_addr32[3] = (__force __be32)digest[1]; 3136 3137 spin_unlock_bh(&lock); 3138 3139 if (ipv6_reserved_interfaceid(temp)) { 3140 dad_count++; 3141 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3142 return -1; 3143 goto retry; 3144 } 3145 3146 *address = temp; 3147 return 0; 3148 } 3149 3150 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3151 { 3152 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3153 3154 if (s->initialized) 3155 return; 3156 s = &idev->cnf.stable_secret; 3157 get_random_bytes(&s->secret, sizeof(s->secret)); 3158 s->initialized = true; 3159 } 3160 3161 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3162 { 3163 struct in6_addr addr; 3164 3165 /* no link local addresses on L3 master devices */ 3166 if (netif_is_l3_master(idev->dev)) 3167 return; 3168 3169 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3170 3171 switch (idev->cnf.addr_gen_mode) { 3172 case IN6_ADDR_GEN_MODE_RANDOM: 3173 ipv6_gen_mode_random_init(idev); 3174 /* fallthrough */ 3175 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3176 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3177 addrconf_add_linklocal(idev, &addr, 3178 IFA_F_STABLE_PRIVACY); 3179 else if (prefix_route) 3180 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3181 break; 3182 case IN6_ADDR_GEN_MODE_EUI64: 3183 /* addrconf_add_linklocal also adds a prefix_route and we 3184 * only need to care about prefix routes if ipv6_generate_eui64 3185 * couldn't generate one. 3186 */ 3187 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3188 addrconf_add_linklocal(idev, &addr, 0); 3189 else if (prefix_route) 3190 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3191 break; 3192 case IN6_ADDR_GEN_MODE_NONE: 3193 default: 3194 /* will not add any link local address */ 3195 break; 3196 } 3197 } 3198 3199 static void addrconf_dev_config(struct net_device *dev) 3200 { 3201 struct inet6_dev *idev; 3202 3203 ASSERT_RTNL(); 3204 3205 if ((dev->type != ARPHRD_ETHER) && 3206 (dev->type != ARPHRD_FDDI) && 3207 (dev->type != ARPHRD_ARCNET) && 3208 (dev->type != ARPHRD_INFINIBAND) && 3209 (dev->type != ARPHRD_IEEE1394) && 3210 (dev->type != ARPHRD_TUNNEL6) && 3211 (dev->type != ARPHRD_6LOWPAN) && 3212 (dev->type != ARPHRD_IP6GRE) && 3213 (dev->type != ARPHRD_IPGRE) && 3214 (dev->type != ARPHRD_TUNNEL) && 3215 (dev->type != ARPHRD_NONE)) { 3216 /* Alas, we support only Ethernet autoconfiguration. */ 3217 return; 3218 } 3219 3220 idev = addrconf_add_dev(dev); 3221 if (IS_ERR(idev)) 3222 return; 3223 3224 /* this device type has no EUI support */ 3225 if (dev->type == ARPHRD_NONE && 3226 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3227 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3228 3229 addrconf_addr_gen(idev, false); 3230 } 3231 3232 #if IS_ENABLED(CONFIG_IPV6_SIT) 3233 static void addrconf_sit_config(struct net_device *dev) 3234 { 3235 struct inet6_dev *idev; 3236 3237 ASSERT_RTNL(); 3238 3239 /* 3240 * Configure the tunnel with one of our IPv4 3241 * addresses... we should configure all of 3242 * our v4 addrs in the tunnel 3243 */ 3244 3245 idev = ipv6_find_idev(dev); 3246 if (!idev) { 3247 pr_debug("%s: add_dev failed\n", __func__); 3248 return; 3249 } 3250 3251 if (dev->priv_flags & IFF_ISATAP) { 3252 addrconf_addr_gen(idev, false); 3253 return; 3254 } 3255 3256 sit_add_v4_addrs(idev); 3257 3258 if (dev->flags&IFF_POINTOPOINT) 3259 addrconf_add_mroute(dev); 3260 } 3261 #endif 3262 3263 #if IS_ENABLED(CONFIG_NET_IPGRE) 3264 static void addrconf_gre_config(struct net_device *dev) 3265 { 3266 struct inet6_dev *idev; 3267 3268 ASSERT_RTNL(); 3269 3270 idev = ipv6_find_idev(dev); 3271 if (!idev) { 3272 pr_debug("%s: add_dev failed\n", __func__); 3273 return; 3274 } 3275 3276 addrconf_addr_gen(idev, true); 3277 if (dev->flags & IFF_POINTOPOINT) 3278 addrconf_add_mroute(dev); 3279 } 3280 #endif 3281 3282 static int fixup_permanent_addr(struct inet6_dev *idev, 3283 struct inet6_ifaddr *ifp) 3284 { 3285 /* !rt6i_node means the host route was removed from the 3286 * FIB, for example, if 'lo' device is taken down. In that 3287 * case regenerate the host route. 3288 */ 3289 if (!ifp->rt || !ifp->rt->rt6i_node) { 3290 struct rt6_info *rt, *prev; 3291 3292 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3293 if (IS_ERR(rt)) 3294 return PTR_ERR(rt); 3295 3296 /* ifp->rt can be accessed outside of rtnl */ 3297 spin_lock(&ifp->lock); 3298 prev = ifp->rt; 3299 ifp->rt = rt; 3300 spin_unlock(&ifp->lock); 3301 3302 ip6_rt_put(prev); 3303 } 3304 3305 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3307 idev->dev, 0, 0); 3308 } 3309 3310 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3311 addrconf_dad_start(ifp); 3312 3313 return 0; 3314 } 3315 3316 static void addrconf_permanent_addr(struct net_device *dev) 3317 { 3318 struct inet6_ifaddr *ifp, *tmp; 3319 struct inet6_dev *idev; 3320 3321 idev = __in6_dev_get(dev); 3322 if (!idev) 3323 return; 3324 3325 write_lock_bh(&idev->lock); 3326 3327 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3328 if ((ifp->flags & IFA_F_PERMANENT) && 3329 fixup_permanent_addr(idev, ifp) < 0) { 3330 write_unlock_bh(&idev->lock); 3331 ipv6_del_addr(ifp); 3332 write_lock_bh(&idev->lock); 3333 3334 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3335 idev->dev->name, &ifp->addr); 3336 } 3337 } 3338 3339 write_unlock_bh(&idev->lock); 3340 } 3341 3342 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3343 void *ptr) 3344 { 3345 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3346 struct netdev_notifier_changeupper_info *info; 3347 struct inet6_dev *idev = __in6_dev_get(dev); 3348 struct net *net = dev_net(dev); 3349 int run_pending = 0; 3350 int err; 3351 3352 switch (event) { 3353 case NETDEV_REGISTER: 3354 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3355 idev = ipv6_add_dev(dev); 3356 if (IS_ERR(idev)) 3357 return notifier_from_errno(PTR_ERR(idev)); 3358 } 3359 break; 3360 3361 case NETDEV_CHANGEMTU: 3362 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3363 if (dev->mtu < IPV6_MIN_MTU) { 3364 addrconf_ifdown(dev, dev != net->loopback_dev); 3365 break; 3366 } 3367 3368 if (idev) { 3369 rt6_mtu_change(dev, dev->mtu); 3370 idev->cnf.mtu6 = dev->mtu; 3371 break; 3372 } 3373 3374 /* allocate new idev */ 3375 idev = ipv6_add_dev(dev); 3376 if (IS_ERR(idev)) 3377 break; 3378 3379 /* device is still not ready */ 3380 if (!(idev->if_flags & IF_READY)) 3381 break; 3382 3383 run_pending = 1; 3384 3385 /* fall through */ 3386 3387 case NETDEV_UP: 3388 case NETDEV_CHANGE: 3389 if (dev->flags & IFF_SLAVE) 3390 break; 3391 3392 if (idev && idev->cnf.disable_ipv6) 3393 break; 3394 3395 if (event == NETDEV_UP) { 3396 /* restore routes for permanent addresses */ 3397 addrconf_permanent_addr(dev); 3398 3399 if (!addrconf_link_ready(dev)) { 3400 /* device is not ready yet. */ 3401 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3402 dev->name); 3403 break; 3404 } 3405 3406 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3407 idev = ipv6_add_dev(dev); 3408 3409 if (!IS_ERR_OR_NULL(idev)) { 3410 idev->if_flags |= IF_READY; 3411 run_pending = 1; 3412 } 3413 } else if (event == NETDEV_CHANGE) { 3414 if (!addrconf_link_ready(dev)) { 3415 /* device is still not ready. */ 3416 break; 3417 } 3418 3419 if (idev) { 3420 if (idev->if_flags & IF_READY) { 3421 /* device is already configured - 3422 * but resend MLD reports, we might 3423 * have roamed and need to update 3424 * multicast snooping switches 3425 */ 3426 ipv6_mc_up(idev); 3427 break; 3428 } 3429 idev->if_flags |= IF_READY; 3430 } 3431 3432 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3433 dev->name); 3434 3435 run_pending = 1; 3436 } 3437 3438 switch (dev->type) { 3439 #if IS_ENABLED(CONFIG_IPV6_SIT) 3440 case ARPHRD_SIT: 3441 addrconf_sit_config(dev); 3442 break; 3443 #endif 3444 #if IS_ENABLED(CONFIG_NET_IPGRE) 3445 case ARPHRD_IPGRE: 3446 addrconf_gre_config(dev); 3447 break; 3448 #endif 3449 case ARPHRD_LOOPBACK: 3450 init_loopback(dev); 3451 break; 3452 3453 default: 3454 addrconf_dev_config(dev); 3455 break; 3456 } 3457 3458 if (!IS_ERR_OR_NULL(idev)) { 3459 if (run_pending) 3460 addrconf_dad_run(idev); 3461 3462 /* 3463 * If the MTU changed during the interface down, 3464 * when the interface up, the changed MTU must be 3465 * reflected in the idev as well as routers. 3466 */ 3467 if (idev->cnf.mtu6 != dev->mtu && 3468 dev->mtu >= IPV6_MIN_MTU) { 3469 rt6_mtu_change(dev, dev->mtu); 3470 idev->cnf.mtu6 = dev->mtu; 3471 } 3472 idev->tstamp = jiffies; 3473 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3474 3475 /* 3476 * If the changed mtu during down is lower than 3477 * IPV6_MIN_MTU stop IPv6 on this interface. 3478 */ 3479 if (dev->mtu < IPV6_MIN_MTU) 3480 addrconf_ifdown(dev, dev != net->loopback_dev); 3481 } 3482 break; 3483 3484 case NETDEV_DOWN: 3485 case NETDEV_UNREGISTER: 3486 /* 3487 * Remove all addresses from this interface. 3488 */ 3489 addrconf_ifdown(dev, event != NETDEV_DOWN); 3490 break; 3491 3492 case NETDEV_CHANGENAME: 3493 if (idev) { 3494 snmp6_unregister_dev(idev); 3495 addrconf_sysctl_unregister(idev); 3496 err = addrconf_sysctl_register(idev); 3497 if (err) 3498 return notifier_from_errno(err); 3499 err = snmp6_register_dev(idev); 3500 if (err) { 3501 addrconf_sysctl_unregister(idev); 3502 return notifier_from_errno(err); 3503 } 3504 } 3505 break; 3506 3507 case NETDEV_PRE_TYPE_CHANGE: 3508 case NETDEV_POST_TYPE_CHANGE: 3509 if (idev) 3510 addrconf_type_change(dev, event); 3511 break; 3512 3513 case NETDEV_CHANGEUPPER: 3514 info = ptr; 3515 3516 /* flush all routes if dev is linked to or unlinked from 3517 * an L3 master device (e.g., VRF) 3518 */ 3519 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3520 addrconf_ifdown(dev, 0); 3521 } 3522 3523 return NOTIFY_OK; 3524 } 3525 3526 /* 3527 * addrconf module should be notified of a device going up 3528 */ 3529 static struct notifier_block ipv6_dev_notf = { 3530 .notifier_call = addrconf_notify, 3531 .priority = ADDRCONF_NOTIFY_PRIORITY, 3532 }; 3533 3534 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3535 { 3536 struct inet6_dev *idev; 3537 ASSERT_RTNL(); 3538 3539 idev = __in6_dev_get(dev); 3540 3541 if (event == NETDEV_POST_TYPE_CHANGE) 3542 ipv6_mc_remap(idev); 3543 else if (event == NETDEV_PRE_TYPE_CHANGE) 3544 ipv6_mc_unmap(idev); 3545 } 3546 3547 static bool addr_is_local(const struct in6_addr *addr) 3548 { 3549 return ipv6_addr_type(addr) & 3550 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3551 } 3552 3553 static int addrconf_ifdown(struct net_device *dev, int how) 3554 { 3555 struct net *net = dev_net(dev); 3556 struct inet6_dev *idev; 3557 struct inet6_ifaddr *ifa, *tmp; 3558 int _keep_addr; 3559 bool keep_addr; 3560 int state, i; 3561 3562 ASSERT_RTNL(); 3563 3564 rt6_ifdown(net, dev); 3565 neigh_ifdown(&nd_tbl, dev); 3566 3567 idev = __in6_dev_get(dev); 3568 if (!idev) 3569 return -ENODEV; 3570 3571 /* 3572 * Step 1: remove reference to ipv6 device from parent device. 3573 * Do not dev_put! 3574 */ 3575 if (how) { 3576 idev->dead = 1; 3577 3578 /* protected by rtnl_lock */ 3579 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3580 3581 /* Step 1.5: remove snmp6 entry */ 3582 snmp6_unregister_dev(idev); 3583 3584 } 3585 3586 /* aggregate the system setting and interface setting */ 3587 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3588 if (!_keep_addr) 3589 _keep_addr = idev->cnf.keep_addr_on_down; 3590 3591 /* combine the user config with event to determine if permanent 3592 * addresses are to be removed from address hash table 3593 */ 3594 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3595 3596 /* Step 2: clear hash table */ 3597 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3598 struct hlist_head *h = &inet6_addr_lst[i]; 3599 3600 spin_lock_bh(&addrconf_hash_lock); 3601 restart: 3602 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3603 if (ifa->idev == idev) { 3604 addrconf_del_dad_work(ifa); 3605 /* combined flag + permanent flag decide if 3606 * address is retained on a down event 3607 */ 3608 if (!keep_addr || 3609 !(ifa->flags & IFA_F_PERMANENT) || 3610 addr_is_local(&ifa->addr)) { 3611 hlist_del_init_rcu(&ifa->addr_lst); 3612 goto restart; 3613 } 3614 } 3615 } 3616 spin_unlock_bh(&addrconf_hash_lock); 3617 } 3618 3619 write_lock_bh(&idev->lock); 3620 3621 addrconf_del_rs_timer(idev); 3622 3623 /* Step 2: clear flags for stateless addrconf */ 3624 if (!how) 3625 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3626 3627 /* Step 3: clear tempaddr list */ 3628 while (!list_empty(&idev->tempaddr_list)) { 3629 ifa = list_first_entry(&idev->tempaddr_list, 3630 struct inet6_ifaddr, tmp_list); 3631 list_del(&ifa->tmp_list); 3632 write_unlock_bh(&idev->lock); 3633 spin_lock_bh(&ifa->lock); 3634 3635 if (ifa->ifpub) { 3636 in6_ifa_put(ifa->ifpub); 3637 ifa->ifpub = NULL; 3638 } 3639 spin_unlock_bh(&ifa->lock); 3640 in6_ifa_put(ifa); 3641 write_lock_bh(&idev->lock); 3642 } 3643 3644 /* re-combine the user config with event to determine if permanent 3645 * addresses are to be removed from the interface list 3646 */ 3647 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3648 3649 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3650 struct rt6_info *rt = NULL; 3651 bool keep; 3652 3653 addrconf_del_dad_work(ifa); 3654 3655 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3656 !addr_is_local(&ifa->addr); 3657 3658 write_unlock_bh(&idev->lock); 3659 spin_lock_bh(&ifa->lock); 3660 3661 if (keep) { 3662 /* set state to skip the notifier below */ 3663 state = INET6_IFADDR_STATE_DEAD; 3664 ifa->state = INET6_IFADDR_STATE_PREDAD; 3665 if (!(ifa->flags & IFA_F_NODAD)) 3666 ifa->flags |= IFA_F_TENTATIVE; 3667 3668 rt = ifa->rt; 3669 ifa->rt = NULL; 3670 } else { 3671 state = ifa->state; 3672 ifa->state = INET6_IFADDR_STATE_DEAD; 3673 } 3674 3675 spin_unlock_bh(&ifa->lock); 3676 3677 if (rt) 3678 ip6_del_rt(rt); 3679 3680 if (state != INET6_IFADDR_STATE_DEAD) { 3681 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3682 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3683 } else { 3684 if (idev->cnf.forwarding) 3685 addrconf_leave_anycast(ifa); 3686 addrconf_leave_solict(ifa->idev, &ifa->addr); 3687 } 3688 3689 write_lock_bh(&idev->lock); 3690 if (!keep) { 3691 list_del_rcu(&ifa->if_list); 3692 in6_ifa_put(ifa); 3693 } 3694 } 3695 3696 write_unlock_bh(&idev->lock); 3697 3698 /* Step 5: Discard anycast and multicast list */ 3699 if (how) { 3700 ipv6_ac_destroy_dev(idev); 3701 ipv6_mc_destroy_dev(idev); 3702 } else { 3703 ipv6_mc_down(idev); 3704 } 3705 3706 idev->tstamp = jiffies; 3707 3708 /* Last: Shot the device (if unregistered) */ 3709 if (how) { 3710 addrconf_sysctl_unregister(idev); 3711 neigh_parms_release(&nd_tbl, idev->nd_parms); 3712 neigh_ifdown(&nd_tbl, dev); 3713 in6_dev_put(idev); 3714 } 3715 return 0; 3716 } 3717 3718 static void addrconf_rs_timer(unsigned long data) 3719 { 3720 struct inet6_dev *idev = (struct inet6_dev *)data; 3721 struct net_device *dev = idev->dev; 3722 struct in6_addr lladdr; 3723 3724 write_lock(&idev->lock); 3725 if (idev->dead || !(idev->if_flags & IF_READY)) 3726 goto out; 3727 3728 if (!ipv6_accept_ra(idev)) 3729 goto out; 3730 3731 /* Announcement received after solicitation was sent */ 3732 if (idev->if_flags & IF_RA_RCVD) 3733 goto out; 3734 3735 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3736 write_unlock(&idev->lock); 3737 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3738 ndisc_send_rs(dev, &lladdr, 3739 &in6addr_linklocal_allrouters); 3740 else 3741 goto put; 3742 3743 write_lock(&idev->lock); 3744 idev->rs_interval = rfc3315_s14_backoff_update( 3745 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3746 /* The wait after the last probe can be shorter */ 3747 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3748 idev->cnf.rtr_solicits) ? 3749 idev->cnf.rtr_solicit_delay : 3750 idev->rs_interval); 3751 } else { 3752 /* 3753 * Note: we do not support deprecated "all on-link" 3754 * assumption any longer. 3755 */ 3756 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3757 } 3758 3759 out: 3760 write_unlock(&idev->lock); 3761 put: 3762 in6_dev_put(idev); 3763 } 3764 3765 /* 3766 * Duplicate Address Detection 3767 */ 3768 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3769 { 3770 unsigned long rand_num; 3771 struct inet6_dev *idev = ifp->idev; 3772 u64 nonce; 3773 3774 if (ifp->flags & IFA_F_OPTIMISTIC) 3775 rand_num = 0; 3776 else 3777 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3778 3779 nonce = 0; 3780 if (idev->cnf.enhanced_dad || 3781 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3782 do 3783 get_random_bytes(&nonce, 6); 3784 while (nonce == 0); 3785 } 3786 ifp->dad_nonce = nonce; 3787 ifp->dad_probes = idev->cnf.dad_transmits; 3788 addrconf_mod_dad_work(ifp, rand_num); 3789 } 3790 3791 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3792 { 3793 struct inet6_dev *idev = ifp->idev; 3794 struct net_device *dev = idev->dev; 3795 bool bump_id, notify = false; 3796 3797 addrconf_join_solict(dev, &ifp->addr); 3798 3799 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3800 3801 read_lock_bh(&idev->lock); 3802 spin_lock(&ifp->lock); 3803 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3804 goto out; 3805 3806 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3807 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 && 3808 idev->cnf.accept_dad < 1) || 3809 !(ifp->flags&IFA_F_TENTATIVE) || 3810 ifp->flags & IFA_F_NODAD) { 3811 bump_id = ifp->flags & IFA_F_TENTATIVE; 3812 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3813 spin_unlock(&ifp->lock); 3814 read_unlock_bh(&idev->lock); 3815 3816 addrconf_dad_completed(ifp, bump_id); 3817 return; 3818 } 3819 3820 if (!(idev->if_flags & IF_READY)) { 3821 spin_unlock(&ifp->lock); 3822 read_unlock_bh(&idev->lock); 3823 /* 3824 * If the device is not ready: 3825 * - keep it tentative if it is a permanent address. 3826 * - otherwise, kill it. 3827 */ 3828 in6_ifa_hold(ifp); 3829 addrconf_dad_stop(ifp, 0); 3830 return; 3831 } 3832 3833 /* 3834 * Optimistic nodes can start receiving 3835 * Frames right away 3836 */ 3837 if (ifp->flags & IFA_F_OPTIMISTIC) { 3838 ip6_ins_rt(ifp->rt); 3839 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) { 3840 /* Because optimistic nodes can use this address, 3841 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3842 */ 3843 notify = true; 3844 } 3845 } 3846 3847 addrconf_dad_kick(ifp); 3848 out: 3849 spin_unlock(&ifp->lock); 3850 read_unlock_bh(&idev->lock); 3851 if (notify) 3852 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3853 } 3854 3855 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3856 { 3857 bool begin_dad = false; 3858 3859 spin_lock_bh(&ifp->lock); 3860 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3861 ifp->state = INET6_IFADDR_STATE_PREDAD; 3862 begin_dad = true; 3863 } 3864 spin_unlock_bh(&ifp->lock); 3865 3866 if (begin_dad) 3867 addrconf_mod_dad_work(ifp, 0); 3868 } 3869 3870 static void addrconf_dad_work(struct work_struct *w) 3871 { 3872 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3873 struct inet6_ifaddr, 3874 dad_work); 3875 struct inet6_dev *idev = ifp->idev; 3876 bool bump_id, disable_ipv6 = false; 3877 struct in6_addr mcaddr; 3878 3879 enum { 3880 DAD_PROCESS, 3881 DAD_BEGIN, 3882 DAD_ABORT, 3883 } action = DAD_PROCESS; 3884 3885 rtnl_lock(); 3886 3887 spin_lock_bh(&ifp->lock); 3888 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3889 action = DAD_BEGIN; 3890 ifp->state = INET6_IFADDR_STATE_DAD; 3891 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3892 action = DAD_ABORT; 3893 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3894 3895 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3896 idev->cnf.accept_dad > 1) && 3897 !idev->cnf.disable_ipv6 && 3898 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3899 struct in6_addr addr; 3900 3901 addr.s6_addr32[0] = htonl(0xfe800000); 3902 addr.s6_addr32[1] = 0; 3903 3904 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3905 ipv6_addr_equal(&ifp->addr, &addr)) { 3906 /* DAD failed for link-local based on MAC */ 3907 idev->cnf.disable_ipv6 = 1; 3908 3909 pr_info("%s: IPv6 being disabled!\n", 3910 ifp->idev->dev->name); 3911 disable_ipv6 = true; 3912 } 3913 } 3914 } 3915 spin_unlock_bh(&ifp->lock); 3916 3917 if (action == DAD_BEGIN) { 3918 addrconf_dad_begin(ifp); 3919 goto out; 3920 } else if (action == DAD_ABORT) { 3921 in6_ifa_hold(ifp); 3922 addrconf_dad_stop(ifp, 1); 3923 if (disable_ipv6) 3924 addrconf_ifdown(idev->dev, 0); 3925 goto out; 3926 } 3927 3928 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3929 goto out; 3930 3931 write_lock_bh(&idev->lock); 3932 if (idev->dead || !(idev->if_flags & IF_READY)) { 3933 write_unlock_bh(&idev->lock); 3934 goto out; 3935 } 3936 3937 spin_lock(&ifp->lock); 3938 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3939 spin_unlock(&ifp->lock); 3940 write_unlock_bh(&idev->lock); 3941 goto out; 3942 } 3943 3944 if (ifp->dad_probes == 0) { 3945 /* 3946 * DAD was successful 3947 */ 3948 3949 bump_id = ifp->flags & IFA_F_TENTATIVE; 3950 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3951 spin_unlock(&ifp->lock); 3952 write_unlock_bh(&idev->lock); 3953 3954 addrconf_dad_completed(ifp, bump_id); 3955 3956 goto out; 3957 } 3958 3959 ifp->dad_probes--; 3960 addrconf_mod_dad_work(ifp, 3961 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3962 spin_unlock(&ifp->lock); 3963 write_unlock_bh(&idev->lock); 3964 3965 /* send a neighbour solicitation for our addr */ 3966 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3967 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3968 ifp->dad_nonce); 3969 out: 3970 in6_ifa_put(ifp); 3971 rtnl_unlock(); 3972 } 3973 3974 /* ifp->idev must be at least read locked */ 3975 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3976 { 3977 struct inet6_ifaddr *ifpiter; 3978 struct inet6_dev *idev = ifp->idev; 3979 3980 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3981 if (ifpiter->scope > IFA_LINK) 3982 break; 3983 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3984 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3985 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3986 IFA_F_PERMANENT) 3987 return false; 3988 } 3989 return true; 3990 } 3991 3992 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3993 { 3994 struct net_device *dev = ifp->idev->dev; 3995 struct in6_addr lladdr; 3996 bool send_rs, send_mld; 3997 3998 addrconf_del_dad_work(ifp); 3999 4000 /* 4001 * Configure the address for reception. Now it is valid. 4002 */ 4003 4004 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4005 4006 /* If added prefix is link local and we are prepared to process 4007 router advertisements, start sending router solicitations. 4008 */ 4009 4010 read_lock_bh(&ifp->idev->lock); 4011 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4012 send_rs = send_mld && 4013 ipv6_accept_ra(ifp->idev) && 4014 ifp->idev->cnf.rtr_solicits != 0 && 4015 (dev->flags&IFF_LOOPBACK) == 0; 4016 read_unlock_bh(&ifp->idev->lock); 4017 4018 /* While dad is in progress mld report's source address is in6_addrany. 4019 * Resend with proper ll now. 4020 */ 4021 if (send_mld) 4022 ipv6_mc_dad_complete(ifp->idev); 4023 4024 if (send_rs) { 4025 /* 4026 * If a host as already performed a random delay 4027 * [...] as part of DAD [...] there is no need 4028 * to delay again before sending the first RS 4029 */ 4030 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4031 return; 4032 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4033 4034 write_lock_bh(&ifp->idev->lock); 4035 spin_lock(&ifp->lock); 4036 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4037 ifp->idev->cnf.rtr_solicit_interval); 4038 ifp->idev->rs_probes = 1; 4039 ifp->idev->if_flags |= IF_RS_SENT; 4040 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4041 spin_unlock(&ifp->lock); 4042 write_unlock_bh(&ifp->idev->lock); 4043 } 4044 4045 if (bump_id) 4046 rt_genid_bump_ipv6(dev_net(dev)); 4047 4048 /* Make sure that a new temporary address will be created 4049 * before this temporary address becomes deprecated. 4050 */ 4051 if (ifp->flags & IFA_F_TEMPORARY) 4052 addrconf_verify_rtnl(); 4053 } 4054 4055 static void addrconf_dad_run(struct inet6_dev *idev) 4056 { 4057 struct inet6_ifaddr *ifp; 4058 4059 read_lock_bh(&idev->lock); 4060 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4061 spin_lock(&ifp->lock); 4062 if (ifp->flags & IFA_F_TENTATIVE && 4063 ifp->state == INET6_IFADDR_STATE_DAD) 4064 addrconf_dad_kick(ifp); 4065 spin_unlock(&ifp->lock); 4066 } 4067 read_unlock_bh(&idev->lock); 4068 } 4069 4070 #ifdef CONFIG_PROC_FS 4071 struct if6_iter_state { 4072 struct seq_net_private p; 4073 int bucket; 4074 int offset; 4075 }; 4076 4077 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4078 { 4079 struct inet6_ifaddr *ifa = NULL; 4080 struct if6_iter_state *state = seq->private; 4081 struct net *net = seq_file_net(seq); 4082 int p = 0; 4083 4084 /* initial bucket if pos is 0 */ 4085 if (pos == 0) { 4086 state->bucket = 0; 4087 state->offset = 0; 4088 } 4089 4090 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4091 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4092 addr_lst) { 4093 if (!net_eq(dev_net(ifa->idev->dev), net)) 4094 continue; 4095 /* sync with offset */ 4096 if (p < state->offset) { 4097 p++; 4098 continue; 4099 } 4100 state->offset++; 4101 return ifa; 4102 } 4103 4104 /* prepare for next bucket */ 4105 state->offset = 0; 4106 p = 0; 4107 } 4108 return NULL; 4109 } 4110 4111 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4112 struct inet6_ifaddr *ifa) 4113 { 4114 struct if6_iter_state *state = seq->private; 4115 struct net *net = seq_file_net(seq); 4116 4117 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4118 if (!net_eq(dev_net(ifa->idev->dev), net)) 4119 continue; 4120 state->offset++; 4121 return ifa; 4122 } 4123 4124 while (++state->bucket < IN6_ADDR_HSIZE) { 4125 state->offset = 0; 4126 hlist_for_each_entry_rcu_bh(ifa, 4127 &inet6_addr_lst[state->bucket], addr_lst) { 4128 if (!net_eq(dev_net(ifa->idev->dev), net)) 4129 continue; 4130 state->offset++; 4131 return ifa; 4132 } 4133 } 4134 4135 return NULL; 4136 } 4137 4138 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4139 __acquires(rcu_bh) 4140 { 4141 rcu_read_lock_bh(); 4142 return if6_get_first(seq, *pos); 4143 } 4144 4145 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4146 { 4147 struct inet6_ifaddr *ifa; 4148 4149 ifa = if6_get_next(seq, v); 4150 ++*pos; 4151 return ifa; 4152 } 4153 4154 static void if6_seq_stop(struct seq_file *seq, void *v) 4155 __releases(rcu_bh) 4156 { 4157 rcu_read_unlock_bh(); 4158 } 4159 4160 static int if6_seq_show(struct seq_file *seq, void *v) 4161 { 4162 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4163 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4164 &ifp->addr, 4165 ifp->idev->dev->ifindex, 4166 ifp->prefix_len, 4167 ifp->scope, 4168 (u8) ifp->flags, 4169 ifp->idev->dev->name); 4170 return 0; 4171 } 4172 4173 static const struct seq_operations if6_seq_ops = { 4174 .start = if6_seq_start, 4175 .next = if6_seq_next, 4176 .show = if6_seq_show, 4177 .stop = if6_seq_stop, 4178 }; 4179 4180 static int if6_seq_open(struct inode *inode, struct file *file) 4181 { 4182 return seq_open_net(inode, file, &if6_seq_ops, 4183 sizeof(struct if6_iter_state)); 4184 } 4185 4186 static const struct file_operations if6_fops = { 4187 .owner = THIS_MODULE, 4188 .open = if6_seq_open, 4189 .read = seq_read, 4190 .llseek = seq_lseek, 4191 .release = seq_release_net, 4192 }; 4193 4194 static int __net_init if6_proc_net_init(struct net *net) 4195 { 4196 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4197 return -ENOMEM; 4198 return 0; 4199 } 4200 4201 static void __net_exit if6_proc_net_exit(struct net *net) 4202 { 4203 remove_proc_entry("if_inet6", net->proc_net); 4204 } 4205 4206 static struct pernet_operations if6_proc_net_ops = { 4207 .init = if6_proc_net_init, 4208 .exit = if6_proc_net_exit, 4209 }; 4210 4211 int __init if6_proc_init(void) 4212 { 4213 return register_pernet_subsys(&if6_proc_net_ops); 4214 } 4215 4216 void if6_proc_exit(void) 4217 { 4218 unregister_pernet_subsys(&if6_proc_net_ops); 4219 } 4220 #endif /* CONFIG_PROC_FS */ 4221 4222 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4223 /* Check if address is a home address configured on any interface. */ 4224 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4225 { 4226 int ret = 0; 4227 struct inet6_ifaddr *ifp = NULL; 4228 unsigned int hash = inet6_addr_hash(addr); 4229 4230 rcu_read_lock_bh(); 4231 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4232 if (!net_eq(dev_net(ifp->idev->dev), net)) 4233 continue; 4234 if (ipv6_addr_equal(&ifp->addr, addr) && 4235 (ifp->flags & IFA_F_HOMEADDRESS)) { 4236 ret = 1; 4237 break; 4238 } 4239 } 4240 rcu_read_unlock_bh(); 4241 return ret; 4242 } 4243 #endif 4244 4245 /* 4246 * Periodic address status verification 4247 */ 4248 4249 static void addrconf_verify_rtnl(void) 4250 { 4251 unsigned long now, next, next_sec, next_sched; 4252 struct inet6_ifaddr *ifp; 4253 int i; 4254 4255 ASSERT_RTNL(); 4256 4257 rcu_read_lock_bh(); 4258 now = jiffies; 4259 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4260 4261 cancel_delayed_work(&addr_chk_work); 4262 4263 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4264 restart: 4265 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4266 unsigned long age; 4267 4268 /* When setting preferred_lft to a value not zero or 4269 * infinity, while valid_lft is infinity 4270 * IFA_F_PERMANENT has a non-infinity life time. 4271 */ 4272 if ((ifp->flags & IFA_F_PERMANENT) && 4273 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4274 continue; 4275 4276 spin_lock(&ifp->lock); 4277 /* We try to batch several events at once. */ 4278 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4279 4280 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4281 age >= ifp->valid_lft) { 4282 spin_unlock(&ifp->lock); 4283 in6_ifa_hold(ifp); 4284 ipv6_del_addr(ifp); 4285 goto restart; 4286 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4287 spin_unlock(&ifp->lock); 4288 continue; 4289 } else if (age >= ifp->prefered_lft) { 4290 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4291 int deprecate = 0; 4292 4293 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4294 deprecate = 1; 4295 ifp->flags |= IFA_F_DEPRECATED; 4296 } 4297 4298 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4299 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4300 next = ifp->tstamp + ifp->valid_lft * HZ; 4301 4302 spin_unlock(&ifp->lock); 4303 4304 if (deprecate) { 4305 in6_ifa_hold(ifp); 4306 4307 ipv6_ifa_notify(0, ifp); 4308 in6_ifa_put(ifp); 4309 goto restart; 4310 } 4311 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4312 !(ifp->flags&IFA_F_TENTATIVE)) { 4313 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4314 ifp->idev->cnf.dad_transmits * 4315 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4316 4317 if (age >= ifp->prefered_lft - regen_advance) { 4318 struct inet6_ifaddr *ifpub = ifp->ifpub; 4319 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4320 next = ifp->tstamp + ifp->prefered_lft * HZ; 4321 if (!ifp->regen_count && ifpub) { 4322 ifp->regen_count++; 4323 in6_ifa_hold(ifp); 4324 in6_ifa_hold(ifpub); 4325 spin_unlock(&ifp->lock); 4326 4327 spin_lock(&ifpub->lock); 4328 ifpub->regen_count = 0; 4329 spin_unlock(&ifpub->lock); 4330 ipv6_create_tempaddr(ifpub, ifp); 4331 in6_ifa_put(ifpub); 4332 in6_ifa_put(ifp); 4333 goto restart; 4334 } 4335 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4336 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4337 spin_unlock(&ifp->lock); 4338 } else { 4339 /* ifp->prefered_lft <= ifp->valid_lft */ 4340 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4341 next = ifp->tstamp + ifp->prefered_lft * HZ; 4342 spin_unlock(&ifp->lock); 4343 } 4344 } 4345 } 4346 4347 next_sec = round_jiffies_up(next); 4348 next_sched = next; 4349 4350 /* If rounded timeout is accurate enough, accept it. */ 4351 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4352 next_sched = next_sec; 4353 4354 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4355 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4356 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4357 4358 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4359 now, next, next_sec, next_sched); 4360 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4361 rcu_read_unlock_bh(); 4362 } 4363 4364 static void addrconf_verify_work(struct work_struct *w) 4365 { 4366 rtnl_lock(); 4367 addrconf_verify_rtnl(); 4368 rtnl_unlock(); 4369 } 4370 4371 static void addrconf_verify(void) 4372 { 4373 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4374 } 4375 4376 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4377 struct in6_addr **peer_pfx) 4378 { 4379 struct in6_addr *pfx = NULL; 4380 4381 *peer_pfx = NULL; 4382 4383 if (addr) 4384 pfx = nla_data(addr); 4385 4386 if (local) { 4387 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4388 *peer_pfx = pfx; 4389 pfx = nla_data(local); 4390 } 4391 4392 return pfx; 4393 } 4394 4395 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4396 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4397 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4398 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4399 [IFA_FLAGS] = { .len = sizeof(u32) }, 4400 }; 4401 4402 static int 4403 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4404 struct netlink_ext_ack *extack) 4405 { 4406 struct net *net = sock_net(skb->sk); 4407 struct ifaddrmsg *ifm; 4408 struct nlattr *tb[IFA_MAX+1]; 4409 struct in6_addr *pfx, *peer_pfx; 4410 u32 ifa_flags; 4411 int err; 4412 4413 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4414 extack); 4415 if (err < 0) 4416 return err; 4417 4418 ifm = nlmsg_data(nlh); 4419 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4420 if (!pfx) 4421 return -EINVAL; 4422 4423 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4424 4425 /* We ignore other flags so far. */ 4426 ifa_flags &= IFA_F_MANAGETEMPADDR; 4427 4428 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4429 ifm->ifa_prefixlen); 4430 } 4431 4432 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4433 u32 prefered_lft, u32 valid_lft) 4434 { 4435 u32 flags; 4436 clock_t expires; 4437 unsigned long timeout; 4438 bool was_managetempaddr; 4439 bool had_prefixroute; 4440 4441 ASSERT_RTNL(); 4442 4443 if (!valid_lft || (prefered_lft > valid_lft)) 4444 return -EINVAL; 4445 4446 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4447 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4448 return -EINVAL; 4449 4450 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4451 if (addrconf_finite_timeout(timeout)) { 4452 expires = jiffies_to_clock_t(timeout * HZ); 4453 valid_lft = timeout; 4454 flags = RTF_EXPIRES; 4455 } else { 4456 expires = 0; 4457 flags = 0; 4458 ifa_flags |= IFA_F_PERMANENT; 4459 } 4460 4461 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4462 if (addrconf_finite_timeout(timeout)) { 4463 if (timeout == 0) 4464 ifa_flags |= IFA_F_DEPRECATED; 4465 prefered_lft = timeout; 4466 } 4467 4468 spin_lock_bh(&ifp->lock); 4469 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4470 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4471 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4472 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4473 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4474 IFA_F_NOPREFIXROUTE); 4475 ifp->flags |= ifa_flags; 4476 ifp->tstamp = jiffies; 4477 ifp->valid_lft = valid_lft; 4478 ifp->prefered_lft = prefered_lft; 4479 4480 spin_unlock_bh(&ifp->lock); 4481 if (!(ifp->flags&IFA_F_TENTATIVE)) 4482 ipv6_ifa_notify(0, ifp); 4483 4484 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4485 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4486 expires, flags); 4487 } else if (had_prefixroute) { 4488 enum cleanup_prefix_rt_t action; 4489 unsigned long rt_expires; 4490 4491 write_lock_bh(&ifp->idev->lock); 4492 action = check_cleanup_prefix_route(ifp, &rt_expires); 4493 write_unlock_bh(&ifp->idev->lock); 4494 4495 if (action != CLEANUP_PREFIX_RT_NOP) { 4496 cleanup_prefix_route(ifp, rt_expires, 4497 action == CLEANUP_PREFIX_RT_DEL); 4498 } 4499 } 4500 4501 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4502 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4503 valid_lft = prefered_lft = 0; 4504 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4505 !was_managetempaddr, jiffies); 4506 } 4507 4508 addrconf_verify_rtnl(); 4509 4510 return 0; 4511 } 4512 4513 static int 4514 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4515 struct netlink_ext_ack *extack) 4516 { 4517 struct net *net = sock_net(skb->sk); 4518 struct ifaddrmsg *ifm; 4519 struct nlattr *tb[IFA_MAX+1]; 4520 struct in6_addr *pfx, *peer_pfx; 4521 struct inet6_ifaddr *ifa; 4522 struct net_device *dev; 4523 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4524 u32 ifa_flags; 4525 int err; 4526 4527 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4528 extack); 4529 if (err < 0) 4530 return err; 4531 4532 ifm = nlmsg_data(nlh); 4533 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4534 if (!pfx) 4535 return -EINVAL; 4536 4537 if (tb[IFA_CACHEINFO]) { 4538 struct ifa_cacheinfo *ci; 4539 4540 ci = nla_data(tb[IFA_CACHEINFO]); 4541 valid_lft = ci->ifa_valid; 4542 preferred_lft = ci->ifa_prefered; 4543 } else { 4544 preferred_lft = INFINITY_LIFE_TIME; 4545 valid_lft = INFINITY_LIFE_TIME; 4546 } 4547 4548 dev = __dev_get_by_index(net, ifm->ifa_index); 4549 if (!dev) 4550 return -ENODEV; 4551 4552 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4553 4554 /* We ignore other flags so far. */ 4555 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4556 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4557 4558 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4559 if (!ifa) { 4560 /* 4561 * It would be best to check for !NLM_F_CREATE here but 4562 * userspace already relies on not having to provide this. 4563 */ 4564 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4565 ifm->ifa_prefixlen, ifa_flags, 4566 preferred_lft, valid_lft); 4567 } 4568 4569 if (nlh->nlmsg_flags & NLM_F_EXCL || 4570 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4571 err = -EEXIST; 4572 else 4573 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4574 4575 in6_ifa_put(ifa); 4576 4577 return err; 4578 } 4579 4580 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4581 u8 scope, int ifindex) 4582 { 4583 struct ifaddrmsg *ifm; 4584 4585 ifm = nlmsg_data(nlh); 4586 ifm->ifa_family = AF_INET6; 4587 ifm->ifa_prefixlen = prefixlen; 4588 ifm->ifa_flags = flags; 4589 ifm->ifa_scope = scope; 4590 ifm->ifa_index = ifindex; 4591 } 4592 4593 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4594 unsigned long tstamp, u32 preferred, u32 valid) 4595 { 4596 struct ifa_cacheinfo ci; 4597 4598 ci.cstamp = cstamp_delta(cstamp); 4599 ci.tstamp = cstamp_delta(tstamp); 4600 ci.ifa_prefered = preferred; 4601 ci.ifa_valid = valid; 4602 4603 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4604 } 4605 4606 static inline int rt_scope(int ifa_scope) 4607 { 4608 if (ifa_scope & IFA_HOST) 4609 return RT_SCOPE_HOST; 4610 else if (ifa_scope & IFA_LINK) 4611 return RT_SCOPE_LINK; 4612 else if (ifa_scope & IFA_SITE) 4613 return RT_SCOPE_SITE; 4614 else 4615 return RT_SCOPE_UNIVERSE; 4616 } 4617 4618 static inline int inet6_ifaddr_msgsize(void) 4619 { 4620 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4621 + nla_total_size(16) /* IFA_LOCAL */ 4622 + nla_total_size(16) /* IFA_ADDRESS */ 4623 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4624 + nla_total_size(4) /* IFA_FLAGS */; 4625 } 4626 4627 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4628 u32 portid, u32 seq, int event, unsigned int flags) 4629 { 4630 struct nlmsghdr *nlh; 4631 u32 preferred, valid; 4632 4633 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4634 if (!nlh) 4635 return -EMSGSIZE; 4636 4637 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4638 ifa->idev->dev->ifindex); 4639 4640 if (!((ifa->flags&IFA_F_PERMANENT) && 4641 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4642 preferred = ifa->prefered_lft; 4643 valid = ifa->valid_lft; 4644 if (preferred != INFINITY_LIFE_TIME) { 4645 long tval = (jiffies - ifa->tstamp)/HZ; 4646 if (preferred > tval) 4647 preferred -= tval; 4648 else 4649 preferred = 0; 4650 if (valid != INFINITY_LIFE_TIME) { 4651 if (valid > tval) 4652 valid -= tval; 4653 else 4654 valid = 0; 4655 } 4656 } 4657 } else { 4658 preferred = INFINITY_LIFE_TIME; 4659 valid = INFINITY_LIFE_TIME; 4660 } 4661 4662 if (!ipv6_addr_any(&ifa->peer_addr)) { 4663 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4664 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4665 goto error; 4666 } else 4667 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4668 goto error; 4669 4670 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4671 goto error; 4672 4673 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4674 goto error; 4675 4676 nlmsg_end(skb, nlh); 4677 return 0; 4678 4679 error: 4680 nlmsg_cancel(skb, nlh); 4681 return -EMSGSIZE; 4682 } 4683 4684 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4685 u32 portid, u32 seq, int event, u16 flags) 4686 { 4687 struct nlmsghdr *nlh; 4688 u8 scope = RT_SCOPE_UNIVERSE; 4689 int ifindex = ifmca->idev->dev->ifindex; 4690 4691 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4692 scope = RT_SCOPE_SITE; 4693 4694 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4695 if (!nlh) 4696 return -EMSGSIZE; 4697 4698 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4699 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4700 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4701 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4702 nlmsg_cancel(skb, nlh); 4703 return -EMSGSIZE; 4704 } 4705 4706 nlmsg_end(skb, nlh); 4707 return 0; 4708 } 4709 4710 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4711 u32 portid, u32 seq, int event, unsigned int flags) 4712 { 4713 struct nlmsghdr *nlh; 4714 u8 scope = RT_SCOPE_UNIVERSE; 4715 int ifindex = ifaca->aca_idev->dev->ifindex; 4716 4717 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4718 scope = RT_SCOPE_SITE; 4719 4720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4721 if (!nlh) 4722 return -EMSGSIZE; 4723 4724 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4725 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4726 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4727 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4728 nlmsg_cancel(skb, nlh); 4729 return -EMSGSIZE; 4730 } 4731 4732 nlmsg_end(skb, nlh); 4733 return 0; 4734 } 4735 4736 enum addr_type_t { 4737 UNICAST_ADDR, 4738 MULTICAST_ADDR, 4739 ANYCAST_ADDR, 4740 }; 4741 4742 /* called with rcu_read_lock() */ 4743 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4744 struct netlink_callback *cb, enum addr_type_t type, 4745 int s_ip_idx, int *p_ip_idx) 4746 { 4747 struct ifmcaddr6 *ifmca; 4748 struct ifacaddr6 *ifaca; 4749 int err = 1; 4750 int ip_idx = *p_ip_idx; 4751 4752 read_lock_bh(&idev->lock); 4753 switch (type) { 4754 case UNICAST_ADDR: { 4755 struct inet6_ifaddr *ifa; 4756 4757 /* unicast address incl. temp addr */ 4758 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4759 if (++ip_idx < s_ip_idx) 4760 continue; 4761 err = inet6_fill_ifaddr(skb, ifa, 4762 NETLINK_CB(cb->skb).portid, 4763 cb->nlh->nlmsg_seq, 4764 RTM_NEWADDR, 4765 NLM_F_MULTI); 4766 if (err < 0) 4767 break; 4768 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4769 } 4770 break; 4771 } 4772 case MULTICAST_ADDR: 4773 /* multicast address */ 4774 for (ifmca = idev->mc_list; ifmca; 4775 ifmca = ifmca->next, ip_idx++) { 4776 if (ip_idx < s_ip_idx) 4777 continue; 4778 err = inet6_fill_ifmcaddr(skb, ifmca, 4779 NETLINK_CB(cb->skb).portid, 4780 cb->nlh->nlmsg_seq, 4781 RTM_GETMULTICAST, 4782 NLM_F_MULTI); 4783 if (err < 0) 4784 break; 4785 } 4786 break; 4787 case ANYCAST_ADDR: 4788 /* anycast address */ 4789 for (ifaca = idev->ac_list; ifaca; 4790 ifaca = ifaca->aca_next, ip_idx++) { 4791 if (ip_idx < s_ip_idx) 4792 continue; 4793 err = inet6_fill_ifacaddr(skb, ifaca, 4794 NETLINK_CB(cb->skb).portid, 4795 cb->nlh->nlmsg_seq, 4796 RTM_GETANYCAST, 4797 NLM_F_MULTI); 4798 if (err < 0) 4799 break; 4800 } 4801 break; 4802 default: 4803 break; 4804 } 4805 read_unlock_bh(&idev->lock); 4806 *p_ip_idx = ip_idx; 4807 return err; 4808 } 4809 4810 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4811 enum addr_type_t type) 4812 { 4813 struct net *net = sock_net(skb->sk); 4814 int h, s_h; 4815 int idx, ip_idx; 4816 int s_idx, s_ip_idx; 4817 struct net_device *dev; 4818 struct inet6_dev *idev; 4819 struct hlist_head *head; 4820 4821 s_h = cb->args[0]; 4822 s_idx = idx = cb->args[1]; 4823 s_ip_idx = ip_idx = cb->args[2]; 4824 4825 rcu_read_lock(); 4826 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4827 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4828 idx = 0; 4829 head = &net->dev_index_head[h]; 4830 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4831 if (idx < s_idx) 4832 goto cont; 4833 if (h > s_h || idx > s_idx) 4834 s_ip_idx = 0; 4835 ip_idx = 0; 4836 idev = __in6_dev_get(dev); 4837 if (!idev) 4838 goto cont; 4839 4840 if (in6_dump_addrs(idev, skb, cb, type, 4841 s_ip_idx, &ip_idx) < 0) 4842 goto done; 4843 cont: 4844 idx++; 4845 } 4846 } 4847 done: 4848 rcu_read_unlock(); 4849 cb->args[0] = h; 4850 cb->args[1] = idx; 4851 cb->args[2] = ip_idx; 4852 4853 return skb->len; 4854 } 4855 4856 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4857 { 4858 enum addr_type_t type = UNICAST_ADDR; 4859 4860 return inet6_dump_addr(skb, cb, type); 4861 } 4862 4863 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4864 { 4865 enum addr_type_t type = MULTICAST_ADDR; 4866 4867 return inet6_dump_addr(skb, cb, type); 4868 } 4869 4870 4871 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4872 { 4873 enum addr_type_t type = ANYCAST_ADDR; 4874 4875 return inet6_dump_addr(skb, cb, type); 4876 } 4877 4878 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4879 struct netlink_ext_ack *extack) 4880 { 4881 struct net *net = sock_net(in_skb->sk); 4882 struct ifaddrmsg *ifm; 4883 struct nlattr *tb[IFA_MAX+1]; 4884 struct in6_addr *addr = NULL, *peer; 4885 struct net_device *dev = NULL; 4886 struct inet6_ifaddr *ifa; 4887 struct sk_buff *skb; 4888 int err; 4889 4890 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4891 extack); 4892 if (err < 0) 4893 return err; 4894 4895 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4896 if (!addr) 4897 return -EINVAL; 4898 4899 ifm = nlmsg_data(nlh); 4900 if (ifm->ifa_index) 4901 dev = dev_get_by_index(net, ifm->ifa_index); 4902 4903 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4904 if (!ifa) { 4905 err = -EADDRNOTAVAIL; 4906 goto errout; 4907 } 4908 4909 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4910 if (!skb) { 4911 err = -ENOBUFS; 4912 goto errout_ifa; 4913 } 4914 4915 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4916 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4917 if (err < 0) { 4918 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4919 WARN_ON(err == -EMSGSIZE); 4920 kfree_skb(skb); 4921 goto errout_ifa; 4922 } 4923 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4924 errout_ifa: 4925 in6_ifa_put(ifa); 4926 errout: 4927 if (dev) 4928 dev_put(dev); 4929 return err; 4930 } 4931 4932 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4933 { 4934 struct sk_buff *skb; 4935 struct net *net = dev_net(ifa->idev->dev); 4936 int err = -ENOBUFS; 4937 4938 /* Don't send DELADDR notification for TENTATIVE address, 4939 * since NEWADDR notification is sent only after removing 4940 * TENTATIVE flag, if DAD has not failed. 4941 */ 4942 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) && 4943 event == RTM_DELADDR) 4944 return; 4945 4946 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4947 if (!skb) 4948 goto errout; 4949 4950 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4951 if (err < 0) { 4952 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4953 WARN_ON(err == -EMSGSIZE); 4954 kfree_skb(skb); 4955 goto errout; 4956 } 4957 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4958 return; 4959 errout: 4960 if (err < 0) 4961 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4962 } 4963 4964 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4965 __s32 *array, int bytes) 4966 { 4967 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4968 4969 memset(array, 0, bytes); 4970 array[DEVCONF_FORWARDING] = cnf->forwarding; 4971 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4972 array[DEVCONF_MTU6] = cnf->mtu6; 4973 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4974 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4975 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4976 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4977 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4978 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4979 jiffies_to_msecs(cnf->rtr_solicit_interval); 4980 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4981 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4982 array[DEVCONF_RTR_SOLICIT_DELAY] = 4983 jiffies_to_msecs(cnf->rtr_solicit_delay); 4984 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4985 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4986 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4987 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4988 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4989 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4990 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4991 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4992 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4993 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4994 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4995 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4996 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4997 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4998 #ifdef CONFIG_IPV6_ROUTER_PREF 4999 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5000 array[DEVCONF_RTR_PROBE_INTERVAL] = 5001 jiffies_to_msecs(cnf->rtr_probe_interval); 5002 #ifdef CONFIG_IPV6_ROUTE_INFO 5003 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5004 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5005 #endif 5006 #endif 5007 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5008 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5009 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5010 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5011 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5012 #endif 5013 #ifdef CONFIG_IPV6_MROUTE 5014 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5015 #endif 5016 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5017 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5018 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5019 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5020 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5021 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5022 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5023 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5024 /* we omit DEVCONF_STABLE_SECRET for now */ 5025 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5026 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5027 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5028 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5029 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5030 #ifdef CONFIG_IPV6_SEG6_HMAC 5031 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5032 #endif 5033 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5034 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5035 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5036 } 5037 5038 static inline size_t inet6_ifla6_size(void) 5039 { 5040 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5041 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5042 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5043 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5044 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5045 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5046 } 5047 5048 static inline size_t inet6_if_nlmsg_size(void) 5049 { 5050 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5051 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5052 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5053 + nla_total_size(4) /* IFLA_MTU */ 5054 + nla_total_size(4) /* IFLA_LINK */ 5055 + nla_total_size(1) /* IFLA_OPERSTATE */ 5056 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5057 } 5058 5059 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5060 int bytes) 5061 { 5062 int i; 5063 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5064 BUG_ON(pad < 0); 5065 5066 /* Use put_unaligned() because stats may not be aligned for u64. */ 5067 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5068 for (i = 1; i < ICMP6_MIB_MAX; i++) 5069 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5070 5071 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5072 } 5073 5074 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5075 int bytes, size_t syncpoff) 5076 { 5077 int i, c; 5078 u64 buff[IPSTATS_MIB_MAX]; 5079 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5080 5081 BUG_ON(pad < 0); 5082 5083 memset(buff, 0, sizeof(buff)); 5084 buff[0] = IPSTATS_MIB_MAX; 5085 5086 for_each_possible_cpu(c) { 5087 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5088 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5089 } 5090 5091 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5092 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5093 } 5094 5095 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5096 int bytes) 5097 { 5098 switch (attrtype) { 5099 case IFLA_INET6_STATS: 5100 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5101 offsetof(struct ipstats_mib, syncp)); 5102 break; 5103 case IFLA_INET6_ICMP6STATS: 5104 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5105 break; 5106 } 5107 } 5108 5109 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5110 u32 ext_filter_mask) 5111 { 5112 struct nlattr *nla; 5113 struct ifla_cacheinfo ci; 5114 5115 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5116 goto nla_put_failure; 5117 ci.max_reasm_len = IPV6_MAXPLEN; 5118 ci.tstamp = cstamp_delta(idev->tstamp); 5119 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5120 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5121 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5122 goto nla_put_failure; 5123 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5124 if (!nla) 5125 goto nla_put_failure; 5126 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5127 5128 /* XXX - MC not implemented */ 5129 5130 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5131 return 0; 5132 5133 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5134 if (!nla) 5135 goto nla_put_failure; 5136 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5137 5138 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5139 if (!nla) 5140 goto nla_put_failure; 5141 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5142 5143 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5144 if (!nla) 5145 goto nla_put_failure; 5146 5147 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5148 goto nla_put_failure; 5149 5150 read_lock_bh(&idev->lock); 5151 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5152 read_unlock_bh(&idev->lock); 5153 5154 return 0; 5155 5156 nla_put_failure: 5157 return -EMSGSIZE; 5158 } 5159 5160 static size_t inet6_get_link_af_size(const struct net_device *dev, 5161 u32 ext_filter_mask) 5162 { 5163 if (!__in6_dev_get(dev)) 5164 return 0; 5165 5166 return inet6_ifla6_size(); 5167 } 5168 5169 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5170 u32 ext_filter_mask) 5171 { 5172 struct inet6_dev *idev = __in6_dev_get(dev); 5173 5174 if (!idev) 5175 return -ENODATA; 5176 5177 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5178 return -EMSGSIZE; 5179 5180 return 0; 5181 } 5182 5183 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5184 { 5185 struct inet6_ifaddr *ifp; 5186 struct net_device *dev = idev->dev; 5187 bool clear_token, update_rs = false; 5188 struct in6_addr ll_addr; 5189 5190 ASSERT_RTNL(); 5191 5192 if (!token) 5193 return -EINVAL; 5194 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5195 return -EINVAL; 5196 if (!ipv6_accept_ra(idev)) 5197 return -EINVAL; 5198 if (idev->cnf.rtr_solicits == 0) 5199 return -EINVAL; 5200 5201 write_lock_bh(&idev->lock); 5202 5203 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5204 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5205 5206 write_unlock_bh(&idev->lock); 5207 5208 clear_token = ipv6_addr_any(token); 5209 if (clear_token) 5210 goto update_lft; 5211 5212 if (!idev->dead && (idev->if_flags & IF_READY) && 5213 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5214 IFA_F_OPTIMISTIC)) { 5215 /* If we're not ready, then normal ifup will take care 5216 * of this. Otherwise, we need to request our rs here. 5217 */ 5218 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5219 update_rs = true; 5220 } 5221 5222 update_lft: 5223 write_lock_bh(&idev->lock); 5224 5225 if (update_rs) { 5226 idev->if_flags |= IF_RS_SENT; 5227 idev->rs_interval = rfc3315_s14_backoff_init( 5228 idev->cnf.rtr_solicit_interval); 5229 idev->rs_probes = 1; 5230 addrconf_mod_rs_timer(idev, idev->rs_interval); 5231 } 5232 5233 /* Well, that's kinda nasty ... */ 5234 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5235 spin_lock(&ifp->lock); 5236 if (ifp->tokenized) { 5237 ifp->valid_lft = 0; 5238 ifp->prefered_lft = 0; 5239 } 5240 spin_unlock(&ifp->lock); 5241 } 5242 5243 write_unlock_bh(&idev->lock); 5244 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5245 addrconf_verify_rtnl(); 5246 return 0; 5247 } 5248 5249 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5250 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5251 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5252 }; 5253 5254 static int inet6_validate_link_af(const struct net_device *dev, 5255 const struct nlattr *nla) 5256 { 5257 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5258 5259 if (dev && !__in6_dev_get(dev)) 5260 return -EAFNOSUPPORT; 5261 5262 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5263 NULL); 5264 } 5265 5266 static int check_addr_gen_mode(int mode) 5267 { 5268 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5269 mode != IN6_ADDR_GEN_MODE_NONE && 5270 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5271 mode != IN6_ADDR_GEN_MODE_RANDOM) 5272 return -EINVAL; 5273 return 1; 5274 } 5275 5276 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5277 int mode) 5278 { 5279 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5280 !idev->cnf.stable_secret.initialized && 5281 !net->ipv6.devconf_dflt->stable_secret.initialized) 5282 return -EINVAL; 5283 return 1; 5284 } 5285 5286 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5287 { 5288 int err = -EINVAL; 5289 struct inet6_dev *idev = __in6_dev_get(dev); 5290 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5291 5292 if (!idev) 5293 return -EAFNOSUPPORT; 5294 5295 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5296 BUG(); 5297 5298 if (tb[IFLA_INET6_TOKEN]) { 5299 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5300 if (err) 5301 return err; 5302 } 5303 5304 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5305 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5306 5307 if (check_addr_gen_mode(mode) < 0 || 5308 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5309 return -EINVAL; 5310 5311 idev->cnf.addr_gen_mode = mode; 5312 err = 0; 5313 } 5314 5315 return err; 5316 } 5317 5318 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5319 u32 portid, u32 seq, int event, unsigned int flags) 5320 { 5321 struct net_device *dev = idev->dev; 5322 struct ifinfomsg *hdr; 5323 struct nlmsghdr *nlh; 5324 void *protoinfo; 5325 5326 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5327 if (!nlh) 5328 return -EMSGSIZE; 5329 5330 hdr = nlmsg_data(nlh); 5331 hdr->ifi_family = AF_INET6; 5332 hdr->__ifi_pad = 0; 5333 hdr->ifi_type = dev->type; 5334 hdr->ifi_index = dev->ifindex; 5335 hdr->ifi_flags = dev_get_flags(dev); 5336 hdr->ifi_change = 0; 5337 5338 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5339 (dev->addr_len && 5340 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5341 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5342 (dev->ifindex != dev_get_iflink(dev) && 5343 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5344 nla_put_u8(skb, IFLA_OPERSTATE, 5345 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5346 goto nla_put_failure; 5347 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5348 if (!protoinfo) 5349 goto nla_put_failure; 5350 5351 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5352 goto nla_put_failure; 5353 5354 nla_nest_end(skb, protoinfo); 5355 nlmsg_end(skb, nlh); 5356 return 0; 5357 5358 nla_put_failure: 5359 nlmsg_cancel(skb, nlh); 5360 return -EMSGSIZE; 5361 } 5362 5363 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5364 { 5365 struct net *net = sock_net(skb->sk); 5366 int h, s_h; 5367 int idx = 0, s_idx; 5368 struct net_device *dev; 5369 struct inet6_dev *idev; 5370 struct hlist_head *head; 5371 5372 s_h = cb->args[0]; 5373 s_idx = cb->args[1]; 5374 5375 rcu_read_lock(); 5376 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5377 idx = 0; 5378 head = &net->dev_index_head[h]; 5379 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5380 if (idx < s_idx) 5381 goto cont; 5382 idev = __in6_dev_get(dev); 5383 if (!idev) 5384 goto cont; 5385 if (inet6_fill_ifinfo(skb, idev, 5386 NETLINK_CB(cb->skb).portid, 5387 cb->nlh->nlmsg_seq, 5388 RTM_NEWLINK, NLM_F_MULTI) < 0) 5389 goto out; 5390 cont: 5391 idx++; 5392 } 5393 } 5394 out: 5395 rcu_read_unlock(); 5396 cb->args[1] = idx; 5397 cb->args[0] = h; 5398 5399 return skb->len; 5400 } 5401 5402 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5403 { 5404 struct sk_buff *skb; 5405 struct net *net = dev_net(idev->dev); 5406 int err = -ENOBUFS; 5407 5408 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5409 if (!skb) 5410 goto errout; 5411 5412 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5413 if (err < 0) { 5414 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5415 WARN_ON(err == -EMSGSIZE); 5416 kfree_skb(skb); 5417 goto errout; 5418 } 5419 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5420 return; 5421 errout: 5422 if (err < 0) 5423 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5424 } 5425 5426 static inline size_t inet6_prefix_nlmsg_size(void) 5427 { 5428 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5429 + nla_total_size(sizeof(struct in6_addr)) 5430 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5431 } 5432 5433 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5434 struct prefix_info *pinfo, u32 portid, u32 seq, 5435 int event, unsigned int flags) 5436 { 5437 struct prefixmsg *pmsg; 5438 struct nlmsghdr *nlh; 5439 struct prefix_cacheinfo ci; 5440 5441 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5442 if (!nlh) 5443 return -EMSGSIZE; 5444 5445 pmsg = nlmsg_data(nlh); 5446 pmsg->prefix_family = AF_INET6; 5447 pmsg->prefix_pad1 = 0; 5448 pmsg->prefix_pad2 = 0; 5449 pmsg->prefix_ifindex = idev->dev->ifindex; 5450 pmsg->prefix_len = pinfo->prefix_len; 5451 pmsg->prefix_type = pinfo->type; 5452 pmsg->prefix_pad3 = 0; 5453 pmsg->prefix_flags = 0; 5454 if (pinfo->onlink) 5455 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5456 if (pinfo->autoconf) 5457 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5458 5459 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5460 goto nla_put_failure; 5461 ci.preferred_time = ntohl(pinfo->prefered); 5462 ci.valid_time = ntohl(pinfo->valid); 5463 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5464 goto nla_put_failure; 5465 nlmsg_end(skb, nlh); 5466 return 0; 5467 5468 nla_put_failure: 5469 nlmsg_cancel(skb, nlh); 5470 return -EMSGSIZE; 5471 } 5472 5473 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5474 struct prefix_info *pinfo) 5475 { 5476 struct sk_buff *skb; 5477 struct net *net = dev_net(idev->dev); 5478 int err = -ENOBUFS; 5479 5480 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5481 if (!skb) 5482 goto errout; 5483 5484 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5485 if (err < 0) { 5486 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5487 WARN_ON(err == -EMSGSIZE); 5488 kfree_skb(skb); 5489 goto errout; 5490 } 5491 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5492 return; 5493 errout: 5494 if (err < 0) 5495 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5496 } 5497 5498 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5499 { 5500 struct net *net = dev_net(ifp->idev->dev); 5501 5502 if (event) 5503 ASSERT_RTNL(); 5504 5505 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5506 5507 switch (event) { 5508 case RTM_NEWADDR: 5509 /* 5510 * If the address was optimistic 5511 * we inserted the route at the start of 5512 * our DAD process, so we don't need 5513 * to do it again 5514 */ 5515 if (!rcu_access_pointer(ifp->rt->rt6i_node)) 5516 ip6_ins_rt(ifp->rt); 5517 if (ifp->idev->cnf.forwarding) 5518 addrconf_join_anycast(ifp); 5519 if (!ipv6_addr_any(&ifp->peer_addr)) 5520 addrconf_prefix_route(&ifp->peer_addr, 128, 5521 ifp->idev->dev, 0, 0); 5522 break; 5523 case RTM_DELADDR: 5524 if (ifp->idev->cnf.forwarding) 5525 addrconf_leave_anycast(ifp); 5526 addrconf_leave_solict(ifp->idev, &ifp->addr); 5527 if (!ipv6_addr_any(&ifp->peer_addr)) { 5528 struct rt6_info *rt; 5529 5530 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5531 ifp->idev->dev, 0, 0); 5532 if (rt) 5533 ip6_del_rt(rt); 5534 } 5535 if (ifp->rt) { 5536 if (dst_hold_safe(&ifp->rt->dst)) 5537 ip6_del_rt(ifp->rt); 5538 } 5539 rt_genid_bump_ipv6(net); 5540 break; 5541 } 5542 atomic_inc(&net->ipv6.dev_addr_genid); 5543 } 5544 5545 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5546 { 5547 rcu_read_lock_bh(); 5548 if (likely(ifp->idev->dead == 0)) 5549 __ipv6_ifa_notify(event, ifp); 5550 rcu_read_unlock_bh(); 5551 } 5552 5553 #ifdef CONFIG_SYSCTL 5554 5555 static 5556 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5557 void __user *buffer, size_t *lenp, loff_t *ppos) 5558 { 5559 int *valp = ctl->data; 5560 int val = *valp; 5561 loff_t pos = *ppos; 5562 struct ctl_table lctl; 5563 int ret; 5564 5565 /* 5566 * ctl->data points to idev->cnf.forwarding, we should 5567 * not modify it until we get the rtnl lock. 5568 */ 5569 lctl = *ctl; 5570 lctl.data = &val; 5571 5572 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5573 5574 if (write) 5575 ret = addrconf_fixup_forwarding(ctl, valp, val); 5576 if (ret) 5577 *ppos = pos; 5578 return ret; 5579 } 5580 5581 static 5582 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5583 void __user *buffer, size_t *lenp, loff_t *ppos) 5584 { 5585 struct inet6_dev *idev = ctl->extra1; 5586 int min_mtu = IPV6_MIN_MTU; 5587 struct ctl_table lctl; 5588 5589 lctl = *ctl; 5590 lctl.extra1 = &min_mtu; 5591 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5592 5593 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5594 } 5595 5596 static void dev_disable_change(struct inet6_dev *idev) 5597 { 5598 struct netdev_notifier_info info; 5599 5600 if (!idev || !idev->dev) 5601 return; 5602 5603 netdev_notifier_info_init(&info, idev->dev); 5604 if (idev->cnf.disable_ipv6) 5605 addrconf_notify(NULL, NETDEV_DOWN, &info); 5606 else 5607 addrconf_notify(NULL, NETDEV_UP, &info); 5608 } 5609 5610 static void addrconf_disable_change(struct net *net, __s32 newf) 5611 { 5612 struct net_device *dev; 5613 struct inet6_dev *idev; 5614 5615 for_each_netdev(net, dev) { 5616 idev = __in6_dev_get(dev); 5617 if (idev) { 5618 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5619 idev->cnf.disable_ipv6 = newf; 5620 if (changed) 5621 dev_disable_change(idev); 5622 } 5623 } 5624 } 5625 5626 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5627 { 5628 struct net *net; 5629 int old; 5630 5631 if (!rtnl_trylock()) 5632 return restart_syscall(); 5633 5634 net = (struct net *)table->extra2; 5635 old = *p; 5636 *p = newf; 5637 5638 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5639 rtnl_unlock(); 5640 return 0; 5641 } 5642 5643 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5644 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5645 addrconf_disable_change(net, newf); 5646 } else if ((!newf) ^ (!old)) 5647 dev_disable_change((struct inet6_dev *)table->extra1); 5648 5649 rtnl_unlock(); 5650 return 0; 5651 } 5652 5653 static 5654 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5655 void __user *buffer, size_t *lenp, loff_t *ppos) 5656 { 5657 int *valp = ctl->data; 5658 int val = *valp; 5659 loff_t pos = *ppos; 5660 struct ctl_table lctl; 5661 int ret; 5662 5663 /* 5664 * ctl->data points to idev->cnf.disable_ipv6, we should 5665 * not modify it until we get the rtnl lock. 5666 */ 5667 lctl = *ctl; 5668 lctl.data = &val; 5669 5670 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5671 5672 if (write) 5673 ret = addrconf_disable_ipv6(ctl, valp, val); 5674 if (ret) 5675 *ppos = pos; 5676 return ret; 5677 } 5678 5679 static 5680 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5681 void __user *buffer, size_t *lenp, loff_t *ppos) 5682 { 5683 int *valp = ctl->data; 5684 int ret; 5685 int old, new; 5686 5687 old = *valp; 5688 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5689 new = *valp; 5690 5691 if (write && old != new) { 5692 struct net *net = ctl->extra2; 5693 5694 if (!rtnl_trylock()) 5695 return restart_syscall(); 5696 5697 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5698 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5699 NETCONFA_PROXY_NEIGH, 5700 NETCONFA_IFINDEX_DEFAULT, 5701 net->ipv6.devconf_dflt); 5702 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5703 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5704 NETCONFA_PROXY_NEIGH, 5705 NETCONFA_IFINDEX_ALL, 5706 net->ipv6.devconf_all); 5707 else { 5708 struct inet6_dev *idev = ctl->extra1; 5709 5710 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5711 NETCONFA_PROXY_NEIGH, 5712 idev->dev->ifindex, 5713 &idev->cnf); 5714 } 5715 rtnl_unlock(); 5716 } 5717 5718 return ret; 5719 } 5720 5721 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5722 void __user *buffer, size_t *lenp, 5723 loff_t *ppos) 5724 { 5725 int ret = 0; 5726 int new_val; 5727 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5728 struct net *net = (struct net *)ctl->extra2; 5729 5730 if (!rtnl_trylock()) 5731 return restart_syscall(); 5732 5733 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5734 5735 if (write) { 5736 new_val = *((int *)ctl->data); 5737 5738 if (check_addr_gen_mode(new_val) < 0) { 5739 ret = -EINVAL; 5740 goto out; 5741 } 5742 5743 /* request for default */ 5744 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5745 ipv6_devconf_dflt.addr_gen_mode = new_val; 5746 5747 /* request for individual net device */ 5748 } else { 5749 if (!idev) 5750 goto out; 5751 5752 if (check_stable_privacy(idev, net, new_val) < 0) { 5753 ret = -EINVAL; 5754 goto out; 5755 } 5756 5757 if (idev->cnf.addr_gen_mode != new_val) { 5758 idev->cnf.addr_gen_mode = new_val; 5759 addrconf_dev_config(idev->dev); 5760 } 5761 } 5762 } 5763 5764 out: 5765 rtnl_unlock(); 5766 5767 return ret; 5768 } 5769 5770 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5771 void __user *buffer, size_t *lenp, 5772 loff_t *ppos) 5773 { 5774 int err; 5775 struct in6_addr addr; 5776 char str[IPV6_MAX_STRLEN]; 5777 struct ctl_table lctl = *ctl; 5778 struct net *net = ctl->extra2; 5779 struct ipv6_stable_secret *secret = ctl->data; 5780 5781 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5782 return -EIO; 5783 5784 lctl.maxlen = IPV6_MAX_STRLEN; 5785 lctl.data = str; 5786 5787 if (!rtnl_trylock()) 5788 return restart_syscall(); 5789 5790 if (!write && !secret->initialized) { 5791 err = -EIO; 5792 goto out; 5793 } 5794 5795 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5796 if (err >= sizeof(str)) { 5797 err = -EIO; 5798 goto out; 5799 } 5800 5801 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5802 if (err || !write) 5803 goto out; 5804 5805 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5806 err = -EIO; 5807 goto out; 5808 } 5809 5810 secret->initialized = true; 5811 secret->secret = addr; 5812 5813 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5814 struct net_device *dev; 5815 5816 for_each_netdev(net, dev) { 5817 struct inet6_dev *idev = __in6_dev_get(dev); 5818 5819 if (idev) { 5820 idev->cnf.addr_gen_mode = 5821 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5822 } 5823 } 5824 } else { 5825 struct inet6_dev *idev = ctl->extra1; 5826 5827 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5828 } 5829 5830 out: 5831 rtnl_unlock(); 5832 5833 return err; 5834 } 5835 5836 static 5837 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5838 int write, 5839 void __user *buffer, 5840 size_t *lenp, 5841 loff_t *ppos) 5842 { 5843 int *valp = ctl->data; 5844 int val = *valp; 5845 loff_t pos = *ppos; 5846 struct ctl_table lctl; 5847 int ret; 5848 5849 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5850 * we should not modify it until we get the rtnl lock. 5851 */ 5852 lctl = *ctl; 5853 lctl.data = &val; 5854 5855 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5856 5857 if (write) 5858 ret = addrconf_fixup_linkdown(ctl, valp, val); 5859 if (ret) 5860 *ppos = pos; 5861 return ret; 5862 } 5863 5864 static 5865 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5866 { 5867 if (rt) { 5868 if (action) 5869 rt->dst.flags |= DST_NOPOLICY; 5870 else 5871 rt->dst.flags &= ~DST_NOPOLICY; 5872 } 5873 } 5874 5875 static 5876 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5877 { 5878 struct inet6_ifaddr *ifa; 5879 5880 read_lock_bh(&idev->lock); 5881 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5882 spin_lock(&ifa->lock); 5883 if (ifa->rt) { 5884 struct rt6_info *rt = ifa->rt; 5885 int cpu; 5886 5887 rcu_read_lock(); 5888 addrconf_set_nopolicy(ifa->rt, val); 5889 if (rt->rt6i_pcpu) { 5890 for_each_possible_cpu(cpu) { 5891 struct rt6_info **rtp; 5892 5893 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5894 addrconf_set_nopolicy(*rtp, val); 5895 } 5896 } 5897 rcu_read_unlock(); 5898 } 5899 spin_unlock(&ifa->lock); 5900 } 5901 read_unlock_bh(&idev->lock); 5902 } 5903 5904 static 5905 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 5906 { 5907 struct inet6_dev *idev; 5908 struct net *net; 5909 5910 if (!rtnl_trylock()) 5911 return restart_syscall(); 5912 5913 *valp = val; 5914 5915 net = (struct net *)ctl->extra2; 5916 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 5917 rtnl_unlock(); 5918 return 0; 5919 } 5920 5921 if (valp == &net->ipv6.devconf_all->disable_policy) { 5922 struct net_device *dev; 5923 5924 for_each_netdev(net, dev) { 5925 idev = __in6_dev_get(dev); 5926 if (idev) 5927 addrconf_disable_policy_idev(idev, val); 5928 } 5929 } else { 5930 idev = (struct inet6_dev *)ctl->extra1; 5931 addrconf_disable_policy_idev(idev, val); 5932 } 5933 5934 rtnl_unlock(); 5935 return 0; 5936 } 5937 5938 static 5939 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 5940 void __user *buffer, size_t *lenp, 5941 loff_t *ppos) 5942 { 5943 int *valp = ctl->data; 5944 int val = *valp; 5945 loff_t pos = *ppos; 5946 struct ctl_table lctl; 5947 int ret; 5948 5949 lctl = *ctl; 5950 lctl.data = &val; 5951 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5952 5953 if (write && (*valp != val)) 5954 ret = addrconf_disable_policy(ctl, valp, val); 5955 5956 if (ret) 5957 *ppos = pos; 5958 5959 return ret; 5960 } 5961 5962 static int minus_one = -1; 5963 static const int one = 1; 5964 static const int two_five_five = 255; 5965 5966 static const struct ctl_table addrconf_sysctl[] = { 5967 { 5968 .procname = "forwarding", 5969 .data = &ipv6_devconf.forwarding, 5970 .maxlen = sizeof(int), 5971 .mode = 0644, 5972 .proc_handler = addrconf_sysctl_forward, 5973 }, 5974 { 5975 .procname = "hop_limit", 5976 .data = &ipv6_devconf.hop_limit, 5977 .maxlen = sizeof(int), 5978 .mode = 0644, 5979 .proc_handler = proc_dointvec_minmax, 5980 .extra1 = (void *)&one, 5981 .extra2 = (void *)&two_five_five, 5982 }, 5983 { 5984 .procname = "mtu", 5985 .data = &ipv6_devconf.mtu6, 5986 .maxlen = sizeof(int), 5987 .mode = 0644, 5988 .proc_handler = addrconf_sysctl_mtu, 5989 }, 5990 { 5991 .procname = "accept_ra", 5992 .data = &ipv6_devconf.accept_ra, 5993 .maxlen = sizeof(int), 5994 .mode = 0644, 5995 .proc_handler = proc_dointvec, 5996 }, 5997 { 5998 .procname = "accept_redirects", 5999 .data = &ipv6_devconf.accept_redirects, 6000 .maxlen = sizeof(int), 6001 .mode = 0644, 6002 .proc_handler = proc_dointvec, 6003 }, 6004 { 6005 .procname = "autoconf", 6006 .data = &ipv6_devconf.autoconf, 6007 .maxlen = sizeof(int), 6008 .mode = 0644, 6009 .proc_handler = proc_dointvec, 6010 }, 6011 { 6012 .procname = "dad_transmits", 6013 .data = &ipv6_devconf.dad_transmits, 6014 .maxlen = sizeof(int), 6015 .mode = 0644, 6016 .proc_handler = proc_dointvec, 6017 }, 6018 { 6019 .procname = "router_solicitations", 6020 .data = &ipv6_devconf.rtr_solicits, 6021 .maxlen = sizeof(int), 6022 .mode = 0644, 6023 .proc_handler = proc_dointvec_minmax, 6024 .extra1 = &minus_one, 6025 }, 6026 { 6027 .procname = "router_solicitation_interval", 6028 .data = &ipv6_devconf.rtr_solicit_interval, 6029 .maxlen = sizeof(int), 6030 .mode = 0644, 6031 .proc_handler = proc_dointvec_jiffies, 6032 }, 6033 { 6034 .procname = "router_solicitation_max_interval", 6035 .data = &ipv6_devconf.rtr_solicit_max_interval, 6036 .maxlen = sizeof(int), 6037 .mode = 0644, 6038 .proc_handler = proc_dointvec_jiffies, 6039 }, 6040 { 6041 .procname = "router_solicitation_delay", 6042 .data = &ipv6_devconf.rtr_solicit_delay, 6043 .maxlen = sizeof(int), 6044 .mode = 0644, 6045 .proc_handler = proc_dointvec_jiffies, 6046 }, 6047 { 6048 .procname = "force_mld_version", 6049 .data = &ipv6_devconf.force_mld_version, 6050 .maxlen = sizeof(int), 6051 .mode = 0644, 6052 .proc_handler = proc_dointvec, 6053 }, 6054 { 6055 .procname = "mldv1_unsolicited_report_interval", 6056 .data = 6057 &ipv6_devconf.mldv1_unsolicited_report_interval, 6058 .maxlen = sizeof(int), 6059 .mode = 0644, 6060 .proc_handler = proc_dointvec_ms_jiffies, 6061 }, 6062 { 6063 .procname = "mldv2_unsolicited_report_interval", 6064 .data = 6065 &ipv6_devconf.mldv2_unsolicited_report_interval, 6066 .maxlen = sizeof(int), 6067 .mode = 0644, 6068 .proc_handler = proc_dointvec_ms_jiffies, 6069 }, 6070 { 6071 .procname = "use_tempaddr", 6072 .data = &ipv6_devconf.use_tempaddr, 6073 .maxlen = sizeof(int), 6074 .mode = 0644, 6075 .proc_handler = proc_dointvec, 6076 }, 6077 { 6078 .procname = "temp_valid_lft", 6079 .data = &ipv6_devconf.temp_valid_lft, 6080 .maxlen = sizeof(int), 6081 .mode = 0644, 6082 .proc_handler = proc_dointvec, 6083 }, 6084 { 6085 .procname = "temp_prefered_lft", 6086 .data = &ipv6_devconf.temp_prefered_lft, 6087 .maxlen = sizeof(int), 6088 .mode = 0644, 6089 .proc_handler = proc_dointvec, 6090 }, 6091 { 6092 .procname = "regen_max_retry", 6093 .data = &ipv6_devconf.regen_max_retry, 6094 .maxlen = sizeof(int), 6095 .mode = 0644, 6096 .proc_handler = proc_dointvec, 6097 }, 6098 { 6099 .procname = "max_desync_factor", 6100 .data = &ipv6_devconf.max_desync_factor, 6101 .maxlen = sizeof(int), 6102 .mode = 0644, 6103 .proc_handler = proc_dointvec, 6104 }, 6105 { 6106 .procname = "max_addresses", 6107 .data = &ipv6_devconf.max_addresses, 6108 .maxlen = sizeof(int), 6109 .mode = 0644, 6110 .proc_handler = proc_dointvec, 6111 }, 6112 { 6113 .procname = "accept_ra_defrtr", 6114 .data = &ipv6_devconf.accept_ra_defrtr, 6115 .maxlen = sizeof(int), 6116 .mode = 0644, 6117 .proc_handler = proc_dointvec, 6118 }, 6119 { 6120 .procname = "accept_ra_min_hop_limit", 6121 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6122 .maxlen = sizeof(int), 6123 .mode = 0644, 6124 .proc_handler = proc_dointvec, 6125 }, 6126 { 6127 .procname = "accept_ra_pinfo", 6128 .data = &ipv6_devconf.accept_ra_pinfo, 6129 .maxlen = sizeof(int), 6130 .mode = 0644, 6131 .proc_handler = proc_dointvec, 6132 }, 6133 #ifdef CONFIG_IPV6_ROUTER_PREF 6134 { 6135 .procname = "accept_ra_rtr_pref", 6136 .data = &ipv6_devconf.accept_ra_rtr_pref, 6137 .maxlen = sizeof(int), 6138 .mode = 0644, 6139 .proc_handler = proc_dointvec, 6140 }, 6141 { 6142 .procname = "router_probe_interval", 6143 .data = &ipv6_devconf.rtr_probe_interval, 6144 .maxlen = sizeof(int), 6145 .mode = 0644, 6146 .proc_handler = proc_dointvec_jiffies, 6147 }, 6148 #ifdef CONFIG_IPV6_ROUTE_INFO 6149 { 6150 .procname = "accept_ra_rt_info_min_plen", 6151 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6152 .maxlen = sizeof(int), 6153 .mode = 0644, 6154 .proc_handler = proc_dointvec, 6155 }, 6156 { 6157 .procname = "accept_ra_rt_info_max_plen", 6158 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6159 .maxlen = sizeof(int), 6160 .mode = 0644, 6161 .proc_handler = proc_dointvec, 6162 }, 6163 #endif 6164 #endif 6165 { 6166 .procname = "proxy_ndp", 6167 .data = &ipv6_devconf.proxy_ndp, 6168 .maxlen = sizeof(int), 6169 .mode = 0644, 6170 .proc_handler = addrconf_sysctl_proxy_ndp, 6171 }, 6172 { 6173 .procname = "accept_source_route", 6174 .data = &ipv6_devconf.accept_source_route, 6175 .maxlen = sizeof(int), 6176 .mode = 0644, 6177 .proc_handler = proc_dointvec, 6178 }, 6179 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6180 { 6181 .procname = "optimistic_dad", 6182 .data = &ipv6_devconf.optimistic_dad, 6183 .maxlen = sizeof(int), 6184 .mode = 0644, 6185 .proc_handler = proc_dointvec, 6186 }, 6187 { 6188 .procname = "use_optimistic", 6189 .data = &ipv6_devconf.use_optimistic, 6190 .maxlen = sizeof(int), 6191 .mode = 0644, 6192 .proc_handler = proc_dointvec, 6193 }, 6194 #endif 6195 #ifdef CONFIG_IPV6_MROUTE 6196 { 6197 .procname = "mc_forwarding", 6198 .data = &ipv6_devconf.mc_forwarding, 6199 .maxlen = sizeof(int), 6200 .mode = 0444, 6201 .proc_handler = proc_dointvec, 6202 }, 6203 #endif 6204 { 6205 .procname = "disable_ipv6", 6206 .data = &ipv6_devconf.disable_ipv6, 6207 .maxlen = sizeof(int), 6208 .mode = 0644, 6209 .proc_handler = addrconf_sysctl_disable, 6210 }, 6211 { 6212 .procname = "accept_dad", 6213 .data = &ipv6_devconf.accept_dad, 6214 .maxlen = sizeof(int), 6215 .mode = 0644, 6216 .proc_handler = proc_dointvec, 6217 }, 6218 { 6219 .procname = "force_tllao", 6220 .data = &ipv6_devconf.force_tllao, 6221 .maxlen = sizeof(int), 6222 .mode = 0644, 6223 .proc_handler = proc_dointvec 6224 }, 6225 { 6226 .procname = "ndisc_notify", 6227 .data = &ipv6_devconf.ndisc_notify, 6228 .maxlen = sizeof(int), 6229 .mode = 0644, 6230 .proc_handler = proc_dointvec 6231 }, 6232 { 6233 .procname = "suppress_frag_ndisc", 6234 .data = &ipv6_devconf.suppress_frag_ndisc, 6235 .maxlen = sizeof(int), 6236 .mode = 0644, 6237 .proc_handler = proc_dointvec 6238 }, 6239 { 6240 .procname = "accept_ra_from_local", 6241 .data = &ipv6_devconf.accept_ra_from_local, 6242 .maxlen = sizeof(int), 6243 .mode = 0644, 6244 .proc_handler = proc_dointvec, 6245 }, 6246 { 6247 .procname = "accept_ra_mtu", 6248 .data = &ipv6_devconf.accept_ra_mtu, 6249 .maxlen = sizeof(int), 6250 .mode = 0644, 6251 .proc_handler = proc_dointvec, 6252 }, 6253 { 6254 .procname = "stable_secret", 6255 .data = &ipv6_devconf.stable_secret, 6256 .maxlen = IPV6_MAX_STRLEN, 6257 .mode = 0600, 6258 .proc_handler = addrconf_sysctl_stable_secret, 6259 }, 6260 { 6261 .procname = "use_oif_addrs_only", 6262 .data = &ipv6_devconf.use_oif_addrs_only, 6263 .maxlen = sizeof(int), 6264 .mode = 0644, 6265 .proc_handler = proc_dointvec, 6266 }, 6267 { 6268 .procname = "ignore_routes_with_linkdown", 6269 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6270 .maxlen = sizeof(int), 6271 .mode = 0644, 6272 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6273 }, 6274 { 6275 .procname = "drop_unicast_in_l2_multicast", 6276 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6277 .maxlen = sizeof(int), 6278 .mode = 0644, 6279 .proc_handler = proc_dointvec, 6280 }, 6281 { 6282 .procname = "drop_unsolicited_na", 6283 .data = &ipv6_devconf.drop_unsolicited_na, 6284 .maxlen = sizeof(int), 6285 .mode = 0644, 6286 .proc_handler = proc_dointvec, 6287 }, 6288 { 6289 .procname = "keep_addr_on_down", 6290 .data = &ipv6_devconf.keep_addr_on_down, 6291 .maxlen = sizeof(int), 6292 .mode = 0644, 6293 .proc_handler = proc_dointvec, 6294 6295 }, 6296 { 6297 .procname = "seg6_enabled", 6298 .data = &ipv6_devconf.seg6_enabled, 6299 .maxlen = sizeof(int), 6300 .mode = 0644, 6301 .proc_handler = proc_dointvec, 6302 }, 6303 #ifdef CONFIG_IPV6_SEG6_HMAC 6304 { 6305 .procname = "seg6_require_hmac", 6306 .data = &ipv6_devconf.seg6_require_hmac, 6307 .maxlen = sizeof(int), 6308 .mode = 0644, 6309 .proc_handler = proc_dointvec, 6310 }, 6311 #endif 6312 { 6313 .procname = "enhanced_dad", 6314 .data = &ipv6_devconf.enhanced_dad, 6315 .maxlen = sizeof(int), 6316 .mode = 0644, 6317 .proc_handler = proc_dointvec, 6318 }, 6319 { 6320 .procname = "addr_gen_mode", 6321 .data = &ipv6_devconf.addr_gen_mode, 6322 .maxlen = sizeof(int), 6323 .mode = 0644, 6324 .proc_handler = addrconf_sysctl_addr_gen_mode, 6325 }, 6326 { 6327 .procname = "disable_policy", 6328 .data = &ipv6_devconf.disable_policy, 6329 .maxlen = sizeof(int), 6330 .mode = 0644, 6331 .proc_handler = addrconf_sysctl_disable_policy, 6332 }, 6333 { 6334 /* sentinel */ 6335 } 6336 }; 6337 6338 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6339 struct inet6_dev *idev, struct ipv6_devconf *p) 6340 { 6341 int i, ifindex; 6342 struct ctl_table *table; 6343 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6344 6345 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6346 if (!table) 6347 goto out; 6348 6349 for (i = 0; table[i].data; i++) { 6350 table[i].data += (char *)p - (char *)&ipv6_devconf; 6351 /* If one of these is already set, then it is not safe to 6352 * overwrite either of them: this makes proc_dointvec_minmax 6353 * usable. 6354 */ 6355 if (!table[i].extra1 && !table[i].extra2) { 6356 table[i].extra1 = idev; /* embedded; no ref */ 6357 table[i].extra2 = net; 6358 } 6359 } 6360 6361 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6362 6363 p->sysctl_header = register_net_sysctl(net, path, table); 6364 if (!p->sysctl_header) 6365 goto free; 6366 6367 if (!strcmp(dev_name, "all")) 6368 ifindex = NETCONFA_IFINDEX_ALL; 6369 else if (!strcmp(dev_name, "default")) 6370 ifindex = NETCONFA_IFINDEX_DEFAULT; 6371 else 6372 ifindex = idev->dev->ifindex; 6373 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6374 ifindex, p); 6375 return 0; 6376 6377 free: 6378 kfree(table); 6379 out: 6380 return -ENOBUFS; 6381 } 6382 6383 static void __addrconf_sysctl_unregister(struct net *net, 6384 struct ipv6_devconf *p, int ifindex) 6385 { 6386 struct ctl_table *table; 6387 6388 if (!p->sysctl_header) 6389 return; 6390 6391 table = p->sysctl_header->ctl_table_arg; 6392 unregister_net_sysctl_table(p->sysctl_header); 6393 p->sysctl_header = NULL; 6394 kfree(table); 6395 6396 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6397 } 6398 6399 static int addrconf_sysctl_register(struct inet6_dev *idev) 6400 { 6401 int err; 6402 6403 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6404 return -EINVAL; 6405 6406 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6407 &ndisc_ifinfo_sysctl_change); 6408 if (err) 6409 return err; 6410 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6411 idev, &idev->cnf); 6412 if (err) 6413 neigh_sysctl_unregister(idev->nd_parms); 6414 6415 return err; 6416 } 6417 6418 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6419 { 6420 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6421 idev->dev->ifindex); 6422 neigh_sysctl_unregister(idev->nd_parms); 6423 } 6424 6425 6426 #endif 6427 6428 static int __net_init addrconf_init_net(struct net *net) 6429 { 6430 int err = -ENOMEM; 6431 struct ipv6_devconf *all, *dflt; 6432 6433 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6434 if (!all) 6435 goto err_alloc_all; 6436 6437 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6438 if (!dflt) 6439 goto err_alloc_dflt; 6440 6441 /* these will be inherited by all namespaces */ 6442 dflt->autoconf = ipv6_defaults.autoconf; 6443 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6444 6445 dflt->stable_secret.initialized = false; 6446 all->stable_secret.initialized = false; 6447 6448 net->ipv6.devconf_all = all; 6449 net->ipv6.devconf_dflt = dflt; 6450 6451 #ifdef CONFIG_SYSCTL 6452 err = __addrconf_sysctl_register(net, "all", NULL, all); 6453 if (err < 0) 6454 goto err_reg_all; 6455 6456 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6457 if (err < 0) 6458 goto err_reg_dflt; 6459 #endif 6460 return 0; 6461 6462 #ifdef CONFIG_SYSCTL 6463 err_reg_dflt: 6464 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6465 err_reg_all: 6466 kfree(dflt); 6467 #endif 6468 err_alloc_dflt: 6469 kfree(all); 6470 err_alloc_all: 6471 return err; 6472 } 6473 6474 static void __net_exit addrconf_exit_net(struct net *net) 6475 { 6476 #ifdef CONFIG_SYSCTL 6477 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6478 NETCONFA_IFINDEX_DEFAULT); 6479 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6480 NETCONFA_IFINDEX_ALL); 6481 #endif 6482 kfree(net->ipv6.devconf_dflt); 6483 kfree(net->ipv6.devconf_all); 6484 } 6485 6486 static struct pernet_operations addrconf_ops = { 6487 .init = addrconf_init_net, 6488 .exit = addrconf_exit_net, 6489 }; 6490 6491 static struct rtnl_af_ops inet6_ops __read_mostly = { 6492 .family = AF_INET6, 6493 .fill_link_af = inet6_fill_link_af, 6494 .get_link_af_size = inet6_get_link_af_size, 6495 .validate_link_af = inet6_validate_link_af, 6496 .set_link_af = inet6_set_link_af, 6497 }; 6498 6499 /* 6500 * Init / cleanup code 6501 */ 6502 6503 int __init addrconf_init(void) 6504 { 6505 struct inet6_dev *idev; 6506 int i, err; 6507 6508 err = ipv6_addr_label_init(); 6509 if (err < 0) { 6510 pr_crit("%s: cannot initialize default policy table: %d\n", 6511 __func__, err); 6512 goto out; 6513 } 6514 6515 err = register_pernet_subsys(&addrconf_ops); 6516 if (err < 0) 6517 goto out_addrlabel; 6518 6519 addrconf_wq = create_workqueue("ipv6_addrconf"); 6520 if (!addrconf_wq) { 6521 err = -ENOMEM; 6522 goto out_nowq; 6523 } 6524 6525 /* The addrconf netdev notifier requires that loopback_dev 6526 * has it's ipv6 private information allocated and setup 6527 * before it can bring up and give link-local addresses 6528 * to other devices which are up. 6529 * 6530 * Unfortunately, loopback_dev is not necessarily the first 6531 * entry in the global dev_base list of net devices. In fact, 6532 * it is likely to be the very last entry on that list. 6533 * So this causes the notifier registry below to try and 6534 * give link-local addresses to all devices besides loopback_dev 6535 * first, then loopback_dev, which cases all the non-loopback_dev 6536 * devices to fail to get a link-local address. 6537 * 6538 * So, as a temporary fix, allocate the ipv6 structure for 6539 * loopback_dev first by hand. 6540 * Longer term, all of the dependencies ipv6 has upon the loopback 6541 * device and it being up should be removed. 6542 */ 6543 rtnl_lock(); 6544 idev = ipv6_add_dev(init_net.loopback_dev); 6545 rtnl_unlock(); 6546 if (IS_ERR(idev)) { 6547 err = PTR_ERR(idev); 6548 goto errlo; 6549 } 6550 6551 ip6_route_init_special_entries(); 6552 6553 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6554 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6555 6556 register_netdevice_notifier(&ipv6_dev_notf); 6557 6558 addrconf_verify(); 6559 6560 rtnl_af_register(&inet6_ops); 6561 6562 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6563 0); 6564 if (err < 0) 6565 goto errout; 6566 6567 /* Only the first call to __rtnl_register can fail */ 6568 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0); 6569 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0); 6570 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6571 inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED); 6572 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6573 inet6_dump_ifmcaddr, 0); 6574 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6575 inet6_dump_ifacaddr, 0); 6576 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6577 inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED); 6578 6579 ipv6_addr_label_rtnl_register(); 6580 6581 return 0; 6582 errout: 6583 rtnl_af_unregister(&inet6_ops); 6584 unregister_netdevice_notifier(&ipv6_dev_notf); 6585 errlo: 6586 destroy_workqueue(addrconf_wq); 6587 out_nowq: 6588 unregister_pernet_subsys(&addrconf_ops); 6589 out_addrlabel: 6590 ipv6_addr_label_cleanup(); 6591 out: 6592 return err; 6593 } 6594 6595 void addrconf_cleanup(void) 6596 { 6597 struct net_device *dev; 6598 int i; 6599 6600 unregister_netdevice_notifier(&ipv6_dev_notf); 6601 unregister_pernet_subsys(&addrconf_ops); 6602 ipv6_addr_label_cleanup(); 6603 6604 rtnl_af_unregister(&inet6_ops); 6605 6606 rtnl_lock(); 6607 6608 /* clean dev list */ 6609 for_each_netdev(&init_net, dev) { 6610 if (__in6_dev_get(dev) == NULL) 6611 continue; 6612 addrconf_ifdown(dev, 1); 6613 } 6614 addrconf_ifdown(init_net.loopback_dev, 2); 6615 6616 /* 6617 * Check hash table. 6618 */ 6619 spin_lock_bh(&addrconf_hash_lock); 6620 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6621 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6622 spin_unlock_bh(&addrconf_hash_lock); 6623 cancel_delayed_work(&addr_chk_work); 6624 rtnl_unlock(); 6625 6626 destroy_workqueue(addrconf_wq); 6627 } 6628