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addrconf.c
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linux-6.19.14/net/ipv6/addrconf.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11/* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37#define pr_fmt(fmt) "IPv6: " fmt 38 39#include <linux/errno.h> 40#include <linux/types.h> 41#include <linux/kernel.h> 42#include <linux/sched/signal.h> 43#include <linux/socket.h> 44#include <linux/sockios.h> 45#include <linux/net.h> 46#include <linux/inet.h> 47#include <linux/in6.h> 48#include <linux/netdevice.h> 49#include <linux/if_addr.h> 50#include <linux/if_arp.h> 51#include <linux/if_arcnet.h> 52#include <linux/if_infiniband.h> 53#include <linux/route.h> 54#include <linux/inetdevice.h> 55#include <linux/init.h> 56#include <linux/slab.h> 57#ifdef CONFIG_SYSCTL 58#include <linux/sysctl.h> 59#endif 60#include <linux/capability.h> 61#include <linux/delay.h> 62#include <linux/notifier.h> 63#include <linux/string.h> 64#include <linux/hash.h> 65 66#include <net/ip_tunnels.h> 67#include <net/net_namespace.h> 68#include <net/sock.h> 69#include <net/snmp.h> 70 71#include <net/6lowpan.h> 72#include <net/firewire.h> 73#include <net/ipv6.h> 74#include <net/protocol.h> 75#include <net/ndisc.h> 76#include <net/ip6_route.h> 77#include <net/addrconf.h> 78#include <net/tcp.h> 79#include <net/ip.h> 80#include <net/netlink.h> 81#include <net/pkt_sched.h> 82#include <net/l3mdev.h> 83#include <net/netdev_lock.h> 84#include <linux/if_tunnel.h> 85#include <linux/rtnetlink.h> 86#include <linux/netconf.h> 87#include <linux/random.h> 88#include <linux/uaccess.h> 89#include <linux/unaligned.h> 90 91#include <linux/proc_fs.h> 92#include <linux/seq_file.h> 93#include <linux/export.h> 94#include <linux/ioam6.h> 95 96#define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99static inline u32 cstamp_delta(unsigned long cstamp) 100{ 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102} 103 104static inline s32 rfc3315_s14_backoff_init(s32 irt) 105{ 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110} 111 112static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113{ 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123} 124 125#ifdef CONFIG_SYSCTL 126static int addrconf_sysctl_register(struct inet6_dev *idev); 127static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128#else 129static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130{ 131 return 0; 132} 133 134static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135{ 136} 137#endif 138 139static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142static int ipv6_count_addresses(const struct inet6_dev *idev); 143static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147#define IN6_ADDR_HSIZE_SHIFT 8 148#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150static void addrconf_verify(struct net *net); 151static void addrconf_verify_rtnl(struct net *net); 152 153static struct workqueue_struct *addrconf_wq; 154 155static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169static void addrconf_dad_work(struct work_struct *w); 170static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173static void addrconf_rs_timer(struct timer_list *t); 174static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_min_advance = REGEN_MIN_ADVANCE, 199 .regen_max_retry = REGEN_MAX_RETRY, 200 .max_desync_factor = MAX_DESYNC_FACTOR, 201 .max_addresses = IPV6_MAX_ADDRESSES, 202 .accept_ra_defrtr = 1, 203 .ra_defrtr_metric = IP6_RT_PRIO_USER, 204 .accept_ra_from_local = 0, 205 .accept_ra_min_hop_limit= 1, 206 .accept_ra_min_lft = 0, 207 .accept_ra_pinfo = 1, 208#ifdef CONFIG_IPV6_ROUTER_PREF 209 .accept_ra_rtr_pref = 1, 210 .rtr_probe_interval = 60 * HZ, 211#ifdef CONFIG_IPV6_ROUTE_INFO 212 .accept_ra_rt_info_min_plen = 0, 213 .accept_ra_rt_info_max_plen = 0, 214#endif 215#endif 216 .proxy_ndp = 0, 217 .accept_source_route = 0, /* we do not accept RH0 by default. */ 218 .disable_ipv6 = 0, 219 .accept_dad = 0, 220 .suppress_frag_ndisc = 1, 221 .accept_ra_mtu = 1, 222 .stable_secret = { 223 .initialized = false, 224 }, 225 .use_oif_addrs_only = 0, 226 .ignore_routes_with_linkdown = 0, 227 .keep_addr_on_down = 0, 228 .seg6_enabled = 0, 229#ifdef CONFIG_IPV6_SEG6_HMAC 230 .seg6_require_hmac = 0, 231#endif 232 .enhanced_dad = 1, 233 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 234 .disable_policy = 0, 235 .rpl_seg_enabled = 0, 236 .ioam6_enabled = 0, 237 .ioam6_id = IOAM6_DEFAULT_IF_ID, 238 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 239 .ndisc_evict_nocarrier = 1, 240 .ra_honor_pio_life = 0, 241 .ra_honor_pio_pflag = 0, 242 .force_forwarding = 0, 243}; 244 245static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 246 .forwarding = 0, 247 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 248 .mtu6 = IPV6_MIN_MTU, 249 .accept_ra = 1, 250 .accept_redirects = 1, 251 .autoconf = 1, 252 .force_mld_version = 0, 253 .mldv1_unsolicited_report_interval = 10 * HZ, 254 .mldv2_unsolicited_report_interval = HZ, 255 .dad_transmits = 1, 256 .rtr_solicits = MAX_RTR_SOLICITATIONS, 257 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 258 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 259 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 260 .use_tempaddr = 0, 261 .temp_valid_lft = TEMP_VALID_LIFETIME, 262 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 263 .regen_min_advance = REGEN_MIN_ADVANCE, 264 .regen_max_retry = REGEN_MAX_RETRY, 265 .max_desync_factor = MAX_DESYNC_FACTOR, 266 .max_addresses = IPV6_MAX_ADDRESSES, 267 .accept_ra_defrtr = 1, 268 .ra_defrtr_metric = IP6_RT_PRIO_USER, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_min_lft = 0, 272 .accept_ra_pinfo = 1, 273#ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276#ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_min_plen = 0, 278 .accept_ra_rt_info_max_plen = 0, 279#endif 280#endif 281 .proxy_ndp = 0, 282 .accept_source_route = 0, /* we do not accept RH0 by default. */ 283 .disable_ipv6 = 0, 284 .accept_dad = 1, 285 .suppress_frag_ndisc = 1, 286 .accept_ra_mtu = 1, 287 .stable_secret = { 288 .initialized = false, 289 }, 290 .use_oif_addrs_only = 0, 291 .ignore_routes_with_linkdown = 0, 292 .keep_addr_on_down = 0, 293 .seg6_enabled = 0, 294#ifdef CONFIG_IPV6_SEG6_HMAC 295 .seg6_require_hmac = 0, 296#endif 297 .enhanced_dad = 1, 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 299 .disable_policy = 0, 300 .rpl_seg_enabled = 0, 301 .ioam6_enabled = 0, 302 .ioam6_id = IOAM6_DEFAULT_IF_ID, 303 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 304 .ndisc_evict_nocarrier = 1, 305 .ra_honor_pio_life = 0, 306 .ra_honor_pio_pflag = 0, 307 .force_forwarding = 0, 308}; 309 310/* Check if link is ready: is it up and is a valid qdisc available */ 311static inline bool addrconf_link_ready(const struct net_device *dev) 312{ 313 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 314} 315 316static void addrconf_del_rs_timer(struct inet6_dev *idev) 317{ 318 if (timer_delete(&idev->rs_timer)) 319 __in6_dev_put(idev); 320} 321 322static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 323{ 324 if (cancel_delayed_work(&ifp->dad_work)) 325 __in6_ifa_put(ifp); 326} 327 328static void addrconf_mod_rs_timer(struct inet6_dev *idev, 329 unsigned long when) 330{ 331 if (!mod_timer(&idev->rs_timer, jiffies + when)) 332 in6_dev_hold(idev); 333} 334 335static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 336 unsigned long delay) 337{ 338 in6_ifa_hold(ifp); 339 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 340 in6_ifa_put(ifp); 341} 342 343static int snmp6_alloc_dev(struct inet6_dev *idev) 344{ 345 int i; 346 347 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 348 if (!idev->stats.ipv6) 349 goto err_ip; 350 351 for_each_possible_cpu(i) { 352 struct ipstats_mib *addrconf_stats; 353 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 354 u64_stats_init(&addrconf_stats->syncp); 355 } 356 357 358 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 359 GFP_KERNEL); 360 if (!idev->stats.icmpv6dev) 361 goto err_icmp; 362 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 363 GFP_KERNEL_ACCOUNT); 364 if (!idev->stats.icmpv6msgdev) 365 goto err_icmpmsg; 366 367 return 0; 368 369err_icmpmsg: 370 kfree(idev->stats.icmpv6dev); 371err_icmp: 372 free_percpu(idev->stats.ipv6); 373err_ip: 374 return -ENOMEM; 375} 376 377static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 378{ 379 struct inet6_dev *ndev; 380 int err = -ENOMEM; 381 382 ASSERT_RTNL(); 383 netdev_ops_assert_locked(dev); 384 385 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 386 return ERR_PTR(-EINVAL); 387 388 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 389 if (!ndev) 390 return ERR_PTR(err); 391 392 rwlock_init(&ndev->lock); 393 ndev->dev = dev; 394 INIT_LIST_HEAD(&ndev->addr_list); 395 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 396 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 397 398 if (ndev->cnf.stable_secret.initialized) 399 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 400 401 ndev->cnf.mtu6 = dev->mtu; 402 ndev->ra_mtu = 0; 403 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 404 if (!ndev->nd_parms) { 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 if (ndev->cnf.forwarding) 409 netif_disable_lro(dev); 410 /* We refer to the device */ 411 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 412 413 if (snmp6_alloc_dev(ndev) < 0) { 414 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 415 __func__); 416 neigh_parms_release(&nd_tbl, ndev->nd_parms); 417 netdev_put(dev, &ndev->dev_tracker); 418 kfree(ndev); 419 return ERR_PTR(err); 420 } 421 422 if (dev != blackhole_netdev) { 423 if (snmp6_register_dev(ndev) < 0) { 424 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 425 __func__, dev->name); 426 goto err_release; 427 } 428 } 429 /* One reference from device. */ 430 refcount_set(&ndev->refcnt, 1); 431 432 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 433 ndev->cnf.accept_dad = -1; 434 435#if IS_ENABLED(CONFIG_IPV6_SIT) 436 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 437 pr_info("%s: Disabled Multicast RS\n", dev->name); 438 ndev->cnf.rtr_solicits = 0; 439 } 440#endif 441 442 INIT_LIST_HEAD(&ndev->tempaddr_list); 443 ndev->desync_factor = U32_MAX; 444 if ((dev->flags&IFF_LOOPBACK) || 445 dev->type == ARPHRD_TUNNEL || 446 dev->type == ARPHRD_TUNNEL6 || 447 dev->type == ARPHRD_SIT || 448 dev->type == ARPHRD_NONE) { 449 ndev->cnf.use_tempaddr = -1; 450 } 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 if (dev != blackhole_netdev) { 460 err = addrconf_sysctl_register(ndev); 461 if (err) { 462 ipv6_mc_destroy_dev(ndev); 463 snmp6_unregister_dev(ndev); 464 goto err_release; 465 } 466 } 467 /* protected by rtnl_lock */ 468 rcu_assign_pointer(dev->ip6_ptr, ndev); 469 470 if (dev != blackhole_netdev) { 471 /* Join interface-local all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 473 474 /* Join all-node multicast group */ 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 476 477 /* Join all-router multicast group if forwarding is set */ 478 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 479 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 480 } 481 return ndev; 482 483err_release: 484 neigh_parms_release(&nd_tbl, ndev->nd_parms); 485 ndev->dead = 1; 486 in6_dev_finish_destroy(ndev); 487 return ERR_PTR(err); 488} 489 490static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 491{ 492 struct inet6_dev *idev; 493 494 ASSERT_RTNL(); 495 496 idev = __in6_dev_get(dev); 497 if (!idev) { 498 idev = ipv6_add_dev(dev); 499 if (IS_ERR(idev)) 500 return idev; 501 } 502 503 if (dev->flags&IFF_UP) 504 ipv6_mc_up(idev); 505 return idev; 506} 507 508static int inet6_netconf_msgsize_devconf(int type) 509{ 510 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 511 + nla_total_size(4); /* NETCONFA_IFINDEX */ 512 bool all = false; 513 514 if (type == NETCONFA_ALL) 515 all = true; 516 517 if (all || type == NETCONFA_FORWARDING) 518 size += nla_total_size(4); 519#ifdef CONFIG_IPV6_MROUTE 520 if (all || type == NETCONFA_MC_FORWARDING) 521 size += nla_total_size(4); 522#endif 523 if (all || type == NETCONFA_PROXY_NEIGH) 524 size += nla_total_size(4); 525 526 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 527 size += nla_total_size(4); 528 529 return size; 530} 531 532static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 533 struct ipv6_devconf *devconf, u32 portid, 534 u32 seq, int event, unsigned int flags, 535 int type) 536{ 537 struct nlmsghdr *nlh; 538 struct netconfmsg *ncm; 539 bool all = false; 540 541 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 542 flags); 543 if (!nlh) 544 return -EMSGSIZE; 545 546 if (type == NETCONFA_ALL) 547 all = true; 548 549 ncm = nlmsg_data(nlh); 550 ncm->ncm_family = AF_INET6; 551 552 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 553 goto nla_put_failure; 554 555 if (!devconf) 556 goto out; 557 558 if ((all || type == NETCONFA_FORWARDING) && 559 nla_put_s32(skb, NETCONFA_FORWARDING, 560 READ_ONCE(devconf->forwarding)) < 0) 561 goto nla_put_failure; 562#ifdef CONFIG_IPV6_MROUTE 563 if ((all || type == NETCONFA_MC_FORWARDING) && 564 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 565 atomic_read(&devconf->mc_forwarding)) < 0) 566 goto nla_put_failure; 567#endif 568 if ((all || type == NETCONFA_PROXY_NEIGH) && 569 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 570 READ_ONCE(devconf->proxy_ndp)) < 0) 571 goto nla_put_failure; 572 573 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 574 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 575 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 576 goto nla_put_failure; 577 578out: 579 nlmsg_end(skb, nlh); 580 return 0; 581 582nla_put_failure: 583 nlmsg_cancel(skb, nlh); 584 return -EMSGSIZE; 585} 586 587void inet6_netconf_notify_devconf(struct net *net, int event, int type, 588 int ifindex, struct ipv6_devconf *devconf) 589{ 590 struct sk_buff *skb; 591 int err = -ENOBUFS; 592 593 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 594 if (!skb) 595 goto errout; 596 597 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 598 event, 0, type); 599 if (err < 0) { 600 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 601 WARN_ON(err == -EMSGSIZE); 602 kfree_skb(skb); 603 goto errout; 604 } 605 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 606 return; 607errout: 608 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 609} 610 611static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 612 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 613 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 614 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 615 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 616}; 617 618static int inet6_netconf_valid_get_req(struct sk_buff *skb, 619 const struct nlmsghdr *nlh, 620 struct nlattr **tb, 621 struct netlink_ext_ack *extack) 622{ 623 int i, err; 624 625 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 626 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 627 return -EINVAL; 628 } 629 630 if (!netlink_strict_get_check(skb)) 631 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 632 tb, NETCONFA_MAX, 633 devconf_ipv6_policy, extack); 634 635 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 636 tb, NETCONFA_MAX, 637 devconf_ipv6_policy, extack); 638 if (err) 639 return err; 640 641 for (i = 0; i <= NETCONFA_MAX; i++) { 642 if (!tb[i]) 643 continue; 644 645 switch (i) { 646 case NETCONFA_IFINDEX: 647 break; 648 default: 649 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 650 return -EINVAL; 651 } 652 } 653 654 return 0; 655} 656 657static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 658 struct nlmsghdr *nlh, 659 struct netlink_ext_ack *extack) 660{ 661 struct net *net = sock_net(in_skb->sk); 662 struct nlattr *tb[NETCONFA_MAX+1]; 663 struct inet6_dev *in6_dev = NULL; 664 struct net_device *dev = NULL; 665 struct sk_buff *skb; 666 struct ipv6_devconf *devconf; 667 int ifindex; 668 int err; 669 670 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 671 if (err < 0) 672 return err; 673 674 if (!tb[NETCONFA_IFINDEX]) 675 return -EINVAL; 676 677 err = -EINVAL; 678 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 679 switch (ifindex) { 680 case NETCONFA_IFINDEX_ALL: 681 devconf = net->ipv6.devconf_all; 682 break; 683 case NETCONFA_IFINDEX_DEFAULT: 684 devconf = net->ipv6.devconf_dflt; 685 break; 686 default: 687 dev = dev_get_by_index(net, ifindex); 688 if (!dev) 689 return -EINVAL; 690 in6_dev = in6_dev_get(dev); 691 if (!in6_dev) 692 goto errout; 693 devconf = &in6_dev->cnf; 694 break; 695 } 696 697 err = -ENOBUFS; 698 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 699 if (!skb) 700 goto errout; 701 702 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 703 NETLINK_CB(in_skb).portid, 704 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 705 NETCONFA_ALL); 706 if (err < 0) { 707 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 708 WARN_ON(err == -EMSGSIZE); 709 kfree_skb(skb); 710 goto errout; 711 } 712 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 713errout: 714 if (in6_dev) 715 in6_dev_put(in6_dev); 716 dev_put(dev); 717 return err; 718} 719 720/* Combine dev_addr_genid and dev_base_seq to detect changes. 721 */ 722static u32 inet6_base_seq(const struct net *net) 723{ 724 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 725 READ_ONCE(net->dev_base_seq); 726 727 /* Must not return 0 (see nl_dump_check_consistent()). 728 * Chose a value far away from 0. 729 */ 730 if (!res) 731 res = 0x80000000; 732 return res; 733} 734 735static int inet6_netconf_dump_devconf(struct sk_buff *skb, 736 struct netlink_callback *cb) 737{ 738 const struct nlmsghdr *nlh = cb->nlh; 739 struct net *net = sock_net(skb->sk); 740 struct { 741 unsigned long ifindex; 742 unsigned int all_default; 743 } *ctx = (void *)cb->ctx; 744 struct net_device *dev; 745 struct inet6_dev *idev; 746 int err = 0; 747 748 if (cb->strict_check) { 749 struct netlink_ext_ack *extack = cb->extack; 750 struct netconfmsg *ncm; 751 752 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 753 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 754 return -EINVAL; 755 } 756 757 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 758 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 759 return -EINVAL; 760 } 761 } 762 763 rcu_read_lock(); 764 for_each_netdev_dump(net, dev, ctx->ifindex) { 765 idev = __in6_dev_get(dev); 766 if (!idev) 767 continue; 768 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 769 &idev->cnf, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, 773 NLM_F_MULTI, 774 NETCONFA_ALL); 775 if (err < 0) 776 goto done; 777 } 778 if (ctx->all_default == 0) { 779 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 780 net->ipv6.devconf_all, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL); 785 if (err < 0) 786 goto done; 787 ctx->all_default++; 788 } 789 if (ctx->all_default == 1) { 790 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 791 net->ipv6.devconf_dflt, 792 NETLINK_CB(cb->skb).portid, 793 nlh->nlmsg_seq, 794 RTM_NEWNETCONF, NLM_F_MULTI, 795 NETCONFA_ALL); 796 if (err < 0) 797 goto done; 798 ctx->all_default++; 799 } 800done: 801 rcu_read_unlock(); 802 return err; 803} 804 805#ifdef CONFIG_SYSCTL 806static void dev_forward_change(struct inet6_dev *idev) 807{ 808 struct net_device *dev; 809 struct inet6_ifaddr *ifa; 810 LIST_HEAD(tmp_addr_list); 811 812 if (!idev) 813 return; 814 dev = idev->dev; 815 if (idev->cnf.forwarding) 816 dev_disable_lro(dev); 817 if (dev->flags & IFF_MULTICAST) { 818 if (idev->cnf.forwarding) { 819 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 820 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 821 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 822 } else { 823 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 824 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 825 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 826 } 827 } 828 829 read_lock_bh(&idev->lock); 830 list_for_each_entry(ifa, &idev->addr_list, if_list) { 831 if (ifa->flags&IFA_F_TENTATIVE) 832 continue; 833 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 834 } 835 read_unlock_bh(&idev->lock); 836 837 while (!list_empty(&tmp_addr_list)) { 838 ifa = list_first_entry(&tmp_addr_list, 839 struct inet6_ifaddr, if_list_aux); 840 list_del(&ifa->if_list_aux); 841 if (idev->cnf.forwarding) 842 addrconf_join_anycast(ifa); 843 else 844 addrconf_leave_anycast(ifa); 845 } 846 847 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 848 NETCONFA_FORWARDING, 849 dev->ifindex, &idev->cnf); 850} 851 852 853static void addrconf_forward_change(struct net *net, __s32 newf) 854{ 855 struct net_device *dev; 856 struct inet6_dev *idev; 857 858 for_each_netdev(net, dev) { 859 idev = __in6_dev_get_rtnl_net(dev); 860 if (idev) { 861 int changed = (!idev->cnf.forwarding) ^ (!newf); 862 /* Disabling all.forwarding sets 0 to force_forwarding for all interfaces */ 863 if (newf == 0) 864 WRITE_ONCE(idev->cnf.force_forwarding, 0); 865 866 WRITE_ONCE(idev->cnf.forwarding, newf); 867 if (changed) 868 dev_forward_change(idev); 869 } 870 } 871} 872 873static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf) 874{ 875 struct net *net = (struct net *)table->extra2; 876 int old; 877 878 if (!rtnl_net_trylock(net)) 879 return restart_syscall(); 880 881 old = *p; 882 WRITE_ONCE(*p, newf); 883 884 if (p == &net->ipv6.devconf_dflt->forwarding) { 885 if ((!newf) ^ (!old)) 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 887 NETCONFA_FORWARDING, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 rtnl_net_unlock(net); 891 return 0; 892 } 893 894 if (p == &net->ipv6.devconf_all->forwarding) { 895 int old_dflt = net->ipv6.devconf_dflt->forwarding; 896 897 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 898 if ((!newf) ^ (!old_dflt)) 899 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 900 NETCONFA_FORWARDING, 901 NETCONFA_IFINDEX_DEFAULT, 902 net->ipv6.devconf_dflt); 903 904 addrconf_forward_change(net, newf); 905 if ((!newf) ^ (!old)) 906 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 907 NETCONFA_FORWARDING, 908 NETCONFA_IFINDEX_ALL, 909 net->ipv6.devconf_all); 910 } else if ((!newf) ^ (!old)) 911 dev_forward_change((struct inet6_dev *)table->extra1); 912 rtnl_net_unlock(net); 913 914 if (newf) 915 rt6_purge_dflt_routers(net); 916 return 1; 917} 918 919static void addrconf_linkdown_change(struct net *net, __s32 newf) 920{ 921 struct net_device *dev; 922 struct inet6_dev *idev; 923 924 for_each_netdev(net, dev) { 925 idev = __in6_dev_get_rtnl_net(dev); 926 if (idev) { 927 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 928 929 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 930 if (changed) 931 inet6_netconf_notify_devconf(dev_net(dev), 932 RTM_NEWNETCONF, 933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 934 dev->ifindex, 935 &idev->cnf); 936 } 937 } 938} 939 940static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf) 941{ 942 struct net *net = (struct net *)table->extra2; 943 int old; 944 945 if (!rtnl_net_trylock(net)) 946 return restart_syscall(); 947 948 old = *p; 949 WRITE_ONCE(*p, newf); 950 951 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 952 if ((!newf) ^ (!old)) 953 inet6_netconf_notify_devconf(net, 954 RTM_NEWNETCONF, 955 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 956 NETCONFA_IFINDEX_DEFAULT, 957 net->ipv6.devconf_dflt); 958 rtnl_net_unlock(net); 959 return 0; 960 } 961 962 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 963 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 964 addrconf_linkdown_change(net, newf); 965 if ((!newf) ^ (!old)) 966 inet6_netconf_notify_devconf(net, 967 RTM_NEWNETCONF, 968 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 969 NETCONFA_IFINDEX_ALL, 970 net->ipv6.devconf_all); 971 } 972 973 rtnl_net_unlock(net); 974 975 return 1; 976} 977 978#endif 979 980/* Nobody refers to this ifaddr, destroy it */ 981void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 982{ 983 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 984 985#ifdef NET_REFCNT_DEBUG 986 pr_debug("%s\n", __func__); 987#endif 988 989 in6_dev_put(ifp->idev); 990 991 if (cancel_delayed_work(&ifp->dad_work)) 992 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 993 ifp); 994 995 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 996 pr_warn("Freeing alive inet6 address %p\n", ifp); 997 return; 998 } 999 1000 kfree_rcu(ifp, rcu); 1001} 1002 1003static void 1004ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 1005{ 1006 struct list_head *p; 1007 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1008 1009 /* 1010 * Each device address list is sorted in order of scope - 1011 * global before linklocal. 1012 */ 1013 list_for_each(p, &idev->addr_list) { 1014 struct inet6_ifaddr *ifa 1015 = list_entry(p, struct inet6_ifaddr, if_list); 1016 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1017 break; 1018 } 1019 1020 list_add_tail_rcu(&ifp->if_list, p); 1021} 1022 1023static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1024{ 1025 u32 val = __ipv6_addr_jhash(addr, net_hash_mix(net)); 1026 1027 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1028} 1029 1030static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1031 struct net_device *dev, unsigned int hash) 1032{ 1033 struct inet6_ifaddr *ifp; 1034 1035 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1036 if (ipv6_addr_equal(&ifp->addr, addr)) { 1037 if (!dev || ifp->idev->dev == dev) 1038 return true; 1039 } 1040 } 1041 return false; 1042} 1043 1044static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1045{ 1046 struct net *net = dev_net(dev); 1047 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1048 int err = 0; 1049 1050 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1051 1052 /* Ignore adding duplicate addresses on an interface */ 1053 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1054 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1055 err = -EEXIST; 1056 } else { 1057 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1058 } 1059 1060 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1061 1062 return err; 1063} 1064 1065/* On success it returns ifp with increased reference count */ 1066 1067static struct inet6_ifaddr * 1068ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1069 bool can_block, struct netlink_ext_ack *extack) 1070{ 1071 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1072 int addr_type = ipv6_addr_type(cfg->pfx); 1073 struct net *net = dev_net(idev->dev); 1074 struct inet6_ifaddr *ifa = NULL; 1075 struct fib6_info *f6i = NULL; 1076 int err = 0; 1077 1078 if (addr_type == IPV6_ADDR_ANY) { 1079 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1080 return ERR_PTR(-EADDRNOTAVAIL); 1081 } else if (addr_type & IPV6_ADDR_MULTICAST && 1082 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1083 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1084 return ERR_PTR(-EADDRNOTAVAIL); 1085 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1086 !netif_is_l3_master(idev->dev) && 1087 addr_type & IPV6_ADDR_LOOPBACK) { 1088 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1089 return ERR_PTR(-EADDRNOTAVAIL); 1090 } 1091 1092 if (idev->dead) { 1093 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1094 err = -ENODEV; 1095 goto out; 1096 } 1097 1098 if (idev->cnf.disable_ipv6) { 1099 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1100 err = -EACCES; 1101 goto out; 1102 } 1103 1104 /* validator notifier needs to be blocking; 1105 * do not call in atomic context 1106 */ 1107 if (can_block) { 1108 struct in6_validator_info i6vi = { 1109 .i6vi_addr = *cfg->pfx, 1110 .i6vi_dev = idev, 1111 .extack = extack, 1112 }; 1113 1114 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1115 err = notifier_to_errno(err); 1116 if (err < 0) 1117 goto out; 1118 } 1119 1120 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1121 if (!ifa) { 1122 err = -ENOBUFS; 1123 goto out; 1124 } 1125 1126 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1127 if (IS_ERR(f6i)) { 1128 err = PTR_ERR(f6i); 1129 f6i = NULL; 1130 goto out; 1131 } 1132 1133 neigh_parms_data_state_setall(idev->nd_parms); 1134 1135 ifa->addr = *cfg->pfx; 1136 if (cfg->peer_pfx) 1137 ifa->peer_addr = *cfg->peer_pfx; 1138 1139 spin_lock_init(&ifa->lock); 1140 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1141 INIT_HLIST_NODE(&ifa->addr_lst); 1142 ifa->scope = cfg->scope; 1143 ifa->prefix_len = cfg->plen; 1144 ifa->rt_priority = cfg->rt_priority; 1145 ifa->flags = cfg->ifa_flags; 1146 ifa->ifa_proto = cfg->ifa_proto; 1147 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1148 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1149 ifa->flags |= IFA_F_TENTATIVE; 1150 ifa->valid_lft = cfg->valid_lft; 1151 ifa->prefered_lft = cfg->preferred_lft; 1152 ifa->cstamp = ifa->tstamp = jiffies; 1153 ifa->tokenized = false; 1154 1155 ifa->rt = f6i; 1156 1157 ifa->idev = idev; 1158 in6_dev_hold(idev); 1159 1160 /* For caller */ 1161 refcount_set(&ifa->refcnt, 1); 1162 1163 rcu_read_lock(); 1164 1165 err = ipv6_add_addr_hash(idev->dev, ifa); 1166 if (err < 0) { 1167 rcu_read_unlock(); 1168 goto out; 1169 } 1170 1171 write_lock_bh(&idev->lock); 1172 1173 /* Add to inet6_dev unicast addr list. */ 1174 ipv6_link_dev_addr(idev, ifa); 1175 1176 if (ifa->flags&IFA_F_TEMPORARY) { 1177 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1178 in6_ifa_hold(ifa); 1179 } 1180 1181 in6_ifa_hold(ifa); 1182 write_unlock_bh(&idev->lock); 1183 1184 rcu_read_unlock(); 1185 1186 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1187out: 1188 if (unlikely(err < 0)) { 1189 fib6_info_release(f6i); 1190 1191 if (ifa) { 1192 if (ifa->idev) 1193 in6_dev_put(ifa->idev); 1194 kfree(ifa); 1195 } 1196 ifa = ERR_PTR(err); 1197 } 1198 1199 return ifa; 1200} 1201 1202enum cleanup_prefix_rt_t { 1203 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1204 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1205 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1206}; 1207 1208/* 1209 * Check, whether the prefix for ifp would still need a prefix route 1210 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1211 * constants. 1212 * 1213 * 1) we don't purge prefix if address was not permanent. 1214 * prefix is managed by its own lifetime. 1215 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1216 * 3) if there are no addresses, delete prefix. 1217 * 4) if there are still other permanent address(es), 1218 * corresponding prefix is still permanent. 1219 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1220 * don't purge the prefix, assume user space is managing it. 1221 * 6) otherwise, update prefix lifetime to the 1222 * longest valid lifetime among the corresponding 1223 * addresses on the device. 1224 * Note: subsequent RA will update lifetime. 1225 **/ 1226static enum cleanup_prefix_rt_t 1227check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1228{ 1229 struct inet6_ifaddr *ifa; 1230 struct inet6_dev *idev = ifp->idev; 1231 unsigned long lifetime; 1232 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1233 1234 *expires = jiffies; 1235 1236 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1237 if (ifa == ifp) 1238 continue; 1239 if (ifa->prefix_len != ifp->prefix_len || 1240 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1241 ifp->prefix_len)) 1242 continue; 1243 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1244 return CLEANUP_PREFIX_RT_NOP; 1245 1246 action = CLEANUP_PREFIX_RT_EXPIRE; 1247 1248 spin_lock(&ifa->lock); 1249 1250 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1251 /* 1252 * Note: Because this address is 1253 * not permanent, lifetime < 1254 * LONG_MAX / HZ here. 1255 */ 1256 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1257 *expires = ifa->tstamp + lifetime * HZ; 1258 spin_unlock(&ifa->lock); 1259 } 1260 1261 return action; 1262} 1263 1264static void 1265cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1266 bool del_rt, bool del_peer) 1267{ 1268 struct fib6_table *table; 1269 struct fib6_info *f6i; 1270 1271 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1272 ifp->prefix_len, 1273 ifp->idev->dev, 0, RTF_DEFAULT, true); 1274 if (f6i) { 1275 if (del_rt) 1276 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1277 else { 1278 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1279 table = f6i->fib6_table; 1280 spin_lock_bh(&table->tb6_lock); 1281 1282 fib6_set_expires(f6i, expires); 1283 fib6_add_gc_list(f6i); 1284 1285 spin_unlock_bh(&table->tb6_lock); 1286 } 1287 fib6_info_release(f6i); 1288 } 1289 } 1290} 1291 1292 1293/* This function wants to get referenced ifp and releases it before return */ 1294 1295static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1296{ 1297 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1298 struct net *net = dev_net(ifp->idev->dev); 1299 unsigned long expires; 1300 int state; 1301 1302 ASSERT_RTNL(); 1303 1304 spin_lock_bh(&ifp->lock); 1305 state = ifp->state; 1306 ifp->state = INET6_IFADDR_STATE_DEAD; 1307 spin_unlock_bh(&ifp->lock); 1308 1309 if (state == INET6_IFADDR_STATE_DEAD) 1310 goto out; 1311 1312 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1313 hlist_del_init_rcu(&ifp->addr_lst); 1314 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1315 1316 write_lock_bh(&ifp->idev->lock); 1317 1318 if (ifp->flags&IFA_F_TEMPORARY) { 1319 list_del(&ifp->tmp_list); 1320 if (ifp->ifpub) { 1321 in6_ifa_put(ifp->ifpub); 1322 ifp->ifpub = NULL; 1323 } 1324 __in6_ifa_put(ifp); 1325 } 1326 1327 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) 1328 action = check_cleanup_prefix_route(ifp, &expires); 1329 1330 list_del_rcu(&ifp->if_list); 1331 __in6_ifa_put(ifp); 1332 1333 write_unlock_bh(&ifp->idev->lock); 1334 1335 addrconf_del_dad_work(ifp); 1336 1337 ipv6_ifa_notify(RTM_DELADDR, ifp); 1338 1339 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1340 1341 if (action != CLEANUP_PREFIX_RT_NOP) { 1342 cleanup_prefix_route(ifp, expires, 1343 action == CLEANUP_PREFIX_RT_DEL, false); 1344 } 1345 1346 /* clean up prefsrc entries */ 1347 rt6_remove_prefsrc(ifp); 1348out: 1349 in6_ifa_put(ifp); 1350} 1351 1352static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1353{ 1354 return READ_ONCE(idev->cnf.regen_min_advance) + 1355 READ_ONCE(idev->cnf.regen_max_retry) * 1356 READ_ONCE(idev->cnf.dad_transmits) * 1357 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1358} 1359 1360static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1361{ 1362 struct inet6_dev *idev = ifp->idev; 1363 unsigned long tmp_tstamp, age; 1364 unsigned long regen_advance; 1365 unsigned long now = jiffies; 1366 u32 if_public_preferred_lft; 1367 s32 cnf_temp_preferred_lft; 1368 struct inet6_ifaddr *ift; 1369 struct ifa6_config cfg; 1370 long max_desync_factor; 1371 struct in6_addr addr; 1372 int ret = 0; 1373 1374 write_lock_bh(&idev->lock); 1375 1376retry: 1377 in6_dev_hold(idev); 1378 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1379 write_unlock_bh(&idev->lock); 1380 pr_info("%s: use_tempaddr is disabled\n", __func__); 1381 in6_dev_put(idev); 1382 ret = -1; 1383 goto out; 1384 } 1385 spin_lock_bh(&ifp->lock); 1386 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1387 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1388 spin_unlock_bh(&ifp->lock); 1389 write_unlock_bh(&idev->lock); 1390 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1391 __func__); 1392 in6_dev_put(idev); 1393 ret = -1; 1394 goto out; 1395 } 1396 in6_ifa_hold(ifp); 1397 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1398 ipv6_gen_rnd_iid(&addr); 1399 1400 age = (now - ifp->tstamp) / HZ; 1401 1402 regen_advance = ipv6_get_regen_advance(idev); 1403 1404 /* recalculate max_desync_factor each time and update 1405 * idev->desync_factor if it's larger 1406 */ 1407 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1408 max_desync_factor = min_t(long, 1409 READ_ONCE(idev->cnf.max_desync_factor), 1410 cnf_temp_preferred_lft - regen_advance); 1411 1412 if (unlikely(idev->desync_factor > max_desync_factor)) { 1413 if (max_desync_factor > 0) { 1414 get_random_bytes(&idev->desync_factor, 1415 sizeof(idev->desync_factor)); 1416 idev->desync_factor %= max_desync_factor; 1417 } else { 1418 idev->desync_factor = 0; 1419 } 1420 } 1421 1422 if_public_preferred_lft = ifp->prefered_lft; 1423 1424 memset(&cfg, 0, sizeof(cfg)); 1425 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1426 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1427 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1428 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1429 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1430 1431 cfg.plen = ifp->prefix_len; 1432 tmp_tstamp = ifp->tstamp; 1433 spin_unlock_bh(&ifp->lock); 1434 1435 write_unlock_bh(&idev->lock); 1436 1437 /* From RFC 4941: 1438 * 1439 * A temporary address is created only if this calculated Preferred 1440 * Lifetime is greater than REGEN_ADVANCE time units. In 1441 * particular, an implementation must not create a temporary address 1442 * with a zero Preferred Lifetime. 1443 * 1444 * ... 1445 * 1446 * When creating a temporary address, the lifetime values MUST be 1447 * derived from the corresponding prefix as follows: 1448 * 1449 * ... 1450 * 1451 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1452 * of the public address or TEMP_PREFERRED_LIFETIME - 1453 * DESYNC_FACTOR. 1454 * 1455 * To comply with the RFC's requirements, clamp the preferred lifetime 1456 * to a minimum of regen_advance, unless that would exceed valid_lft or 1457 * ifp->prefered_lft. 1458 * 1459 * Use age calculation as in addrconf_verify to avoid unnecessary 1460 * temporary addresses being generated. 1461 */ 1462 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1463 if (cfg.preferred_lft <= regen_advance + age) { 1464 cfg.preferred_lft = regen_advance + age + 1; 1465 if (cfg.preferred_lft > cfg.valid_lft || 1466 cfg.preferred_lft > if_public_preferred_lft) { 1467 in6_ifa_put(ifp); 1468 in6_dev_put(idev); 1469 ret = -1; 1470 goto out; 1471 } 1472 } 1473 1474 cfg.ifa_flags = IFA_F_TEMPORARY; 1475 /* set in addrconf_prefix_rcv() */ 1476 if (ifp->flags & IFA_F_OPTIMISTIC) 1477 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1478 1479 cfg.pfx = &addr; 1480 cfg.scope = ipv6_addr_scope(cfg.pfx); 1481 1482 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1483 if (IS_ERR(ift)) { 1484 in6_ifa_put(ifp); 1485 in6_dev_put(idev); 1486 pr_info("%s: retry temporary address regeneration\n", __func__); 1487 write_lock_bh(&idev->lock); 1488 goto retry; 1489 } 1490 1491 spin_lock_bh(&ift->lock); 1492 ift->ifpub = ifp; 1493 ift->cstamp = now; 1494 ift->tstamp = tmp_tstamp; 1495 spin_unlock_bh(&ift->lock); 1496 1497 addrconf_dad_start(ift); 1498 in6_ifa_put(ift); 1499 in6_dev_put(idev); 1500out: 1501 return ret; 1502} 1503 1504/* 1505 * Choose an appropriate source address (RFC3484) 1506 */ 1507enum { 1508 IPV6_SADDR_RULE_INIT = 0, 1509 IPV6_SADDR_RULE_LOCAL, 1510 IPV6_SADDR_RULE_SCOPE, 1511 IPV6_SADDR_RULE_PREFERRED, 1512#ifdef CONFIG_IPV6_MIP6 1513 IPV6_SADDR_RULE_HOA, 1514#endif 1515 IPV6_SADDR_RULE_OIF, 1516 IPV6_SADDR_RULE_LABEL, 1517 IPV6_SADDR_RULE_PRIVACY, 1518 IPV6_SADDR_RULE_ORCHID, 1519 IPV6_SADDR_RULE_PREFIX, 1520#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1521 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1522#endif 1523 IPV6_SADDR_RULE_MAX 1524}; 1525 1526struct ipv6_saddr_score { 1527 int rule; 1528 int addr_type; 1529 struct inet6_ifaddr *ifa; 1530 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1531 int scopedist; 1532 int matchlen; 1533}; 1534 1535struct ipv6_saddr_dst { 1536 const struct in6_addr *addr; 1537 int ifindex; 1538 int scope; 1539 int label; 1540 unsigned int prefs; 1541}; 1542 1543static inline int ipv6_saddr_preferred(int type) 1544{ 1545 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1546 return 1; 1547 return 0; 1548} 1549 1550static bool ipv6_use_optimistic_addr(const struct net *net, 1551 const struct inet6_dev *idev) 1552{ 1553#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1554 if (!idev) 1555 return false; 1556 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1557 !READ_ONCE(idev->cnf.optimistic_dad)) 1558 return false; 1559 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1560 !READ_ONCE(idev->cnf.use_optimistic)) 1561 return false; 1562 1563 return true; 1564#else 1565 return false; 1566#endif 1567} 1568 1569static bool ipv6_allow_optimistic_dad(const struct net *net, 1570 const struct inet6_dev *idev) 1571{ 1572#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1573 if (!idev) 1574 return false; 1575 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1576 !READ_ONCE(idev->cnf.optimistic_dad)) 1577 return false; 1578 1579 return true; 1580#else 1581 return false; 1582#endif 1583} 1584 1585static int ipv6_get_saddr_eval(struct net *net, 1586 struct ipv6_saddr_score *score, 1587 struct ipv6_saddr_dst *dst, 1588 int i) 1589{ 1590 int ret; 1591 1592 if (i <= score->rule) { 1593 switch (i) { 1594 case IPV6_SADDR_RULE_SCOPE: 1595 ret = score->scopedist; 1596 break; 1597 case IPV6_SADDR_RULE_PREFIX: 1598 ret = score->matchlen; 1599 break; 1600 default: 1601 ret = !!test_bit(i, score->scorebits); 1602 } 1603 goto out; 1604 } 1605 1606 switch (i) { 1607 case IPV6_SADDR_RULE_INIT: 1608 /* Rule 0: remember if hiscore is not ready yet */ 1609 ret = !!score->ifa; 1610 break; 1611 case IPV6_SADDR_RULE_LOCAL: 1612 /* Rule 1: Prefer same address */ 1613 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1614 break; 1615 case IPV6_SADDR_RULE_SCOPE: 1616 /* Rule 2: Prefer appropriate scope 1617 * 1618 * ret 1619 * ^ 1620 * -1 | d 15 1621 * ---+--+-+---> scope 1622 * | 1623 * | d is scope of the destination. 1624 * B-d | \ 1625 * | \ <- smaller scope is better if 1626 * B-15 | \ if scope is enough for destination. 1627 * | ret = B - scope (-1 <= scope >= d <= 15). 1628 * d-C-1 | / 1629 * |/ <- greater is better 1630 * -C / if scope is not enough for destination. 1631 * /| ret = scope - C (-1 <= d < scope <= 15). 1632 * 1633 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1634 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1635 * Assume B = 0 and we get C > 29. 1636 */ 1637 ret = __ipv6_addr_src_scope(score->addr_type); 1638 if (ret >= dst->scope) 1639 ret = -ret; 1640 else 1641 ret -= 128; /* 30 is enough */ 1642 score->scopedist = ret; 1643 break; 1644 case IPV6_SADDR_RULE_PREFERRED: 1645 { 1646 /* Rule 3: Avoid deprecated and optimistic addresses */ 1647 u8 avoid = IFA_F_DEPRECATED; 1648 1649 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1650 avoid |= IFA_F_OPTIMISTIC; 1651 ret = ipv6_saddr_preferred(score->addr_type) || 1652 !(score->ifa->flags & avoid); 1653 break; 1654 } 1655#ifdef CONFIG_IPV6_MIP6 1656 case IPV6_SADDR_RULE_HOA: 1657 { 1658 /* Rule 4: Prefer home address */ 1659 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1660 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1661 break; 1662 } 1663#endif 1664 case IPV6_SADDR_RULE_OIF: 1665 /* Rule 5: Prefer outgoing interface */ 1666 ret = (!dst->ifindex || 1667 dst->ifindex == score->ifa->idev->dev->ifindex); 1668 break; 1669 case IPV6_SADDR_RULE_LABEL: 1670 /* Rule 6: Prefer matching label */ 1671 ret = ipv6_addr_label(net, 1672 &score->ifa->addr, score->addr_type, 1673 score->ifa->idev->dev->ifindex) == dst->label; 1674 break; 1675 case IPV6_SADDR_RULE_PRIVACY: 1676 { 1677 /* Rule 7: Prefer public address 1678 * Note: prefer temporary address if use_tempaddr >= 2 1679 */ 1680 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1681 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1682 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1683 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1684 break; 1685 } 1686 case IPV6_SADDR_RULE_ORCHID: 1687 /* Rule 8-: Prefer ORCHID vs ORCHID or 1688 * non-ORCHID vs non-ORCHID 1689 */ 1690 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1691 ipv6_addr_orchid(dst->addr)); 1692 break; 1693 case IPV6_SADDR_RULE_PREFIX: 1694 /* Rule 8: Use longest matching prefix */ 1695 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1696 if (ret > score->ifa->prefix_len) 1697 ret = score->ifa->prefix_len; 1698 score->matchlen = ret; 1699 break; 1700#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1701 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1702 /* Optimistic addresses still have lower precedence than other 1703 * preferred addresses. 1704 */ 1705 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1706 break; 1707#endif 1708 default: 1709 ret = 0; 1710 } 1711 1712 if (ret) 1713 __set_bit(i, score->scorebits); 1714 score->rule = i; 1715out: 1716 return ret; 1717} 1718 1719static int __ipv6_dev_get_saddr(struct net *net, 1720 struct ipv6_saddr_dst *dst, 1721 struct inet6_dev *idev, 1722 struct ipv6_saddr_score *scores, 1723 int hiscore_idx) 1724{ 1725 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1726 1727 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1728 int i; 1729 1730 /* 1731 * - Tentative Address (RFC2462 section 5.4) 1732 * - A tentative address is not considered 1733 * "assigned to an interface" in the traditional 1734 * sense, unless it is also flagged as optimistic. 1735 * - Candidate Source Address (section 4) 1736 * - In any case, anycast addresses, multicast 1737 * addresses, and the unspecified address MUST 1738 * NOT be included in a candidate set. 1739 */ 1740 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1741 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1742 continue; 1743 1744 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1745 1746 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1747 score->addr_type & IPV6_ADDR_MULTICAST)) { 1748 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1749 idev->dev->name); 1750 continue; 1751 } 1752 1753 score->rule = -1; 1754 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1755 1756 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1757 int minihiscore, miniscore; 1758 1759 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1760 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1761 1762 if (minihiscore > miniscore) { 1763 if (i == IPV6_SADDR_RULE_SCOPE && 1764 score->scopedist > 0) { 1765 /* 1766 * special case: 1767 * each remaining entry 1768 * has too small (not enough) 1769 * scope, because ifa entries 1770 * are sorted by their scope 1771 * values. 1772 */ 1773 goto out; 1774 } 1775 break; 1776 } else if (minihiscore < miniscore) { 1777 swap(hiscore, score); 1778 hiscore_idx = 1 - hiscore_idx; 1779 1780 /* restore our iterator */ 1781 score->ifa = hiscore->ifa; 1782 1783 break; 1784 } 1785 } 1786 } 1787out: 1788 return hiscore_idx; 1789} 1790 1791static int ipv6_get_saddr_master(struct net *net, 1792 const struct net_device *dst_dev, 1793 const struct net_device *master, 1794 struct ipv6_saddr_dst *dst, 1795 struct ipv6_saddr_score *scores, 1796 int hiscore_idx) 1797{ 1798 struct inet6_dev *idev; 1799 1800 idev = __in6_dev_get(dst_dev); 1801 if (idev) 1802 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1803 scores, hiscore_idx); 1804 1805 idev = __in6_dev_get(master); 1806 if (idev) 1807 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1808 scores, hiscore_idx); 1809 1810 return hiscore_idx; 1811} 1812 1813int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1814 const struct in6_addr *daddr, unsigned int prefs, 1815 struct in6_addr *saddr) 1816{ 1817 struct ipv6_saddr_score scores[2], *hiscore; 1818 struct ipv6_saddr_dst dst; 1819 struct inet6_dev *idev; 1820 struct net_device *dev; 1821 int dst_type; 1822 bool use_oif_addr = false; 1823 int hiscore_idx = 0; 1824 int ret = 0; 1825 1826 dst_type = __ipv6_addr_type(daddr); 1827 dst.addr = daddr; 1828 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1829 dst.scope = __ipv6_addr_src_scope(dst_type); 1830 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1831 dst.prefs = prefs; 1832 1833 scores[hiscore_idx].rule = -1; 1834 scores[hiscore_idx].ifa = NULL; 1835 1836 rcu_read_lock(); 1837 1838 /* Candidate Source Address (section 4) 1839 * - multicast and link-local destination address, 1840 * the set of candidate source address MUST only 1841 * include addresses assigned to interfaces 1842 * belonging to the same link as the outgoing 1843 * interface. 1844 * (- For site-local destination addresses, the 1845 * set of candidate source addresses MUST only 1846 * include addresses assigned to interfaces 1847 * belonging to the same site as the outgoing 1848 * interface.) 1849 * - "It is RECOMMENDED that the candidate source addresses 1850 * be the set of unicast addresses assigned to the 1851 * interface that will be used to send to the destination 1852 * (the 'outgoing' interface)." (RFC 6724) 1853 */ 1854 if (dst_dev) { 1855 idev = __in6_dev_get(dst_dev); 1856 if ((dst_type & IPV6_ADDR_MULTICAST) || 1857 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1858 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1859 use_oif_addr = true; 1860 } 1861 } 1862 1863 if (use_oif_addr) { 1864 if (idev) 1865 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1866 } else { 1867 const struct net_device *master; 1868 int master_idx = 0; 1869 1870 /* if dst_dev exists and is enslaved to an L3 device, then 1871 * prefer addresses from dst_dev and then the master over 1872 * any other enslaved devices in the L3 domain. 1873 */ 1874 master = l3mdev_master_dev_rcu(dst_dev); 1875 if (master) { 1876 master_idx = master->ifindex; 1877 1878 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1879 master, &dst, 1880 scores, hiscore_idx); 1881 1882 if (scores[hiscore_idx].ifa && 1883 scores[hiscore_idx].scopedist >= 0) 1884 goto out; 1885 } 1886 1887 for_each_netdev_rcu(net, dev) { 1888 /* only consider addresses on devices in the 1889 * same L3 domain 1890 */ 1891 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1892 continue; 1893 idev = __in6_dev_get(dev); 1894 if (!idev) 1895 continue; 1896 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1897 } 1898 } 1899 1900out: 1901 hiscore = &scores[hiscore_idx]; 1902 if (!hiscore->ifa) 1903 ret = -EADDRNOTAVAIL; 1904 else 1905 *saddr = hiscore->ifa->addr; 1906 1907 rcu_read_unlock(); 1908 return ret; 1909} 1910EXPORT_SYMBOL(ipv6_dev_get_saddr); 1911 1912static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1913 u32 banned_flags) 1914{ 1915 struct inet6_ifaddr *ifp; 1916 int err = -EADDRNOTAVAIL; 1917 1918 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1919 if (ifp->scope > IFA_LINK) 1920 break; 1921 if (ifp->scope == IFA_LINK && 1922 !(ifp->flags & banned_flags)) { 1923 *addr = ifp->addr; 1924 err = 0; 1925 break; 1926 } 1927 } 1928 return err; 1929} 1930 1931int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1932 u32 banned_flags) 1933{ 1934 struct inet6_dev *idev; 1935 int err = -EADDRNOTAVAIL; 1936 1937 rcu_read_lock(); 1938 idev = __in6_dev_get(dev); 1939 if (idev) { 1940 read_lock_bh(&idev->lock); 1941 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1942 read_unlock_bh(&idev->lock); 1943 } 1944 rcu_read_unlock(); 1945 return err; 1946} 1947 1948static int ipv6_count_addresses(const struct inet6_dev *idev) 1949{ 1950 const struct inet6_ifaddr *ifp; 1951 int cnt = 0; 1952 1953 rcu_read_lock(); 1954 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1955 cnt++; 1956 rcu_read_unlock(); 1957 return cnt; 1958} 1959 1960int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1961 const struct net_device *dev, int strict) 1962{ 1963 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1964 strict, IFA_F_TENTATIVE); 1965} 1966EXPORT_SYMBOL(ipv6_chk_addr); 1967 1968/* device argument is used to find the L3 domain of interest. If 1969 * skip_dev_check is set, then the ifp device is not checked against 1970 * the passed in dev argument. So the 2 cases for addresses checks are: 1971 * 1. does the address exist in the L3 domain that dev is part of 1972 * (skip_dev_check = true), or 1973 * 1974 * 2. does the address exist on the specific device 1975 * (skip_dev_check = false) 1976 */ 1977static struct net_device * 1978__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1979 const struct net_device *dev, bool skip_dev_check, 1980 int strict, u32 banned_flags) 1981{ 1982 unsigned int hash = inet6_addr_hash(net, addr); 1983 struct net_device *l3mdev, *ndev; 1984 struct inet6_ifaddr *ifp; 1985 u32 ifp_flags; 1986 1987 rcu_read_lock(); 1988 1989 l3mdev = l3mdev_master_dev_rcu(dev); 1990 if (skip_dev_check) 1991 dev = NULL; 1992 1993 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1994 ndev = ifp->idev->dev; 1995 1996 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1997 continue; 1998 1999 /* Decouple optimistic from tentative for evaluation here. 2000 * Ban optimistic addresses explicitly, when required. 2001 */ 2002 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 2003 ? (ifp->flags&~IFA_F_TENTATIVE) 2004 : ifp->flags; 2005 if (ipv6_addr_equal(&ifp->addr, addr) && 2006 !(ifp_flags&banned_flags) && 2007 (!dev || ndev == dev || 2008 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2009 rcu_read_unlock(); 2010 return ndev; 2011 } 2012 } 2013 2014 rcu_read_unlock(); 2015 return NULL; 2016} 2017 2018int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2019 const struct net_device *dev, bool skip_dev_check, 2020 int strict, u32 banned_flags) 2021{ 2022 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2023 strict, banned_flags) ? 1 : 0; 2024} 2025EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2026 2027 2028/* Compares an address/prefix_len with addresses on device @dev. 2029 * If one is found it returns true. 2030 */ 2031bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2032 const unsigned int prefix_len, struct net_device *dev) 2033{ 2034 const struct inet6_ifaddr *ifa; 2035 const struct inet6_dev *idev; 2036 bool ret = false; 2037 2038 rcu_read_lock(); 2039 idev = __in6_dev_get(dev); 2040 if (idev) { 2041 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2042 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2043 if (ret) 2044 break; 2045 } 2046 } 2047 rcu_read_unlock(); 2048 2049 return ret; 2050} 2051EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2052 2053int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2054{ 2055 const struct inet6_ifaddr *ifa; 2056 const struct inet6_dev *idev; 2057 int onlink; 2058 2059 onlink = 0; 2060 rcu_read_lock(); 2061 idev = __in6_dev_get(dev); 2062 if (idev) { 2063 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2064 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2065 ifa->prefix_len); 2066 if (onlink) 2067 break; 2068 } 2069 } 2070 rcu_read_unlock(); 2071 return onlink; 2072} 2073EXPORT_SYMBOL(ipv6_chk_prefix); 2074 2075/** 2076 * ipv6_dev_find - find the first device with a given source address. 2077 * @net: the net namespace 2078 * @addr: the source address 2079 * @dev: used to find the L3 domain of interest 2080 * 2081 * The caller should be protected by RCU, or RTNL. 2082 */ 2083struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2084 struct net_device *dev) 2085{ 2086 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2087 IFA_F_TENTATIVE); 2088} 2089EXPORT_SYMBOL(ipv6_dev_find); 2090 2091struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2092 struct net_device *dev, int strict) 2093{ 2094 unsigned int hash = inet6_addr_hash(net, addr); 2095 struct inet6_ifaddr *ifp, *result = NULL; 2096 2097 rcu_read_lock(); 2098 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2099 if (ipv6_addr_equal(&ifp->addr, addr)) { 2100 if (!dev || ifp->idev->dev == dev || 2101 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2102 if (in6_ifa_hold_safe(ifp)) { 2103 result = ifp; 2104 break; 2105 } 2106 } 2107 } 2108 } 2109 rcu_read_unlock(); 2110 2111 return result; 2112} 2113 2114/* Gets referenced address, destroys ifaddr */ 2115 2116static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2117{ 2118 if (dad_failed) 2119 ifp->flags |= IFA_F_DADFAILED; 2120 2121 if (ifp->flags&IFA_F_TEMPORARY) { 2122 struct inet6_ifaddr *ifpub; 2123 spin_lock_bh(&ifp->lock); 2124 ifpub = ifp->ifpub; 2125 if (ifpub) { 2126 in6_ifa_hold(ifpub); 2127 spin_unlock_bh(&ifp->lock); 2128 ipv6_create_tempaddr(ifpub, true); 2129 in6_ifa_put(ifpub); 2130 } else { 2131 spin_unlock_bh(&ifp->lock); 2132 } 2133 ipv6_del_addr(ifp); 2134 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2135 spin_lock_bh(&ifp->lock); 2136 addrconf_del_dad_work(ifp); 2137 ifp->flags |= IFA_F_TENTATIVE; 2138 if (dad_failed) 2139 ifp->flags &= ~IFA_F_OPTIMISTIC; 2140 spin_unlock_bh(&ifp->lock); 2141 if (dad_failed) 2142 ipv6_ifa_notify(0, ifp); 2143 in6_ifa_put(ifp); 2144 } else { 2145 ipv6_del_addr(ifp); 2146 } 2147} 2148 2149static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2150{ 2151 int err = -ENOENT; 2152 2153 spin_lock_bh(&ifp->lock); 2154 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2155 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2156 err = 0; 2157 } 2158 spin_unlock_bh(&ifp->lock); 2159 2160 return err; 2161} 2162 2163void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2164{ 2165 struct inet6_dev *idev = ifp->idev; 2166 struct net *net = dev_net(idev->dev); 2167 int max_addresses; 2168 2169 if (addrconf_dad_end(ifp)) { 2170 in6_ifa_put(ifp); 2171 return; 2172 } 2173 2174 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2175 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2176 2177 spin_lock_bh(&ifp->lock); 2178 2179 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2180 struct in6_addr new_addr; 2181 struct inet6_ifaddr *ifp2; 2182 int retries = ifp->stable_privacy_retry + 1; 2183 struct ifa6_config cfg = { 2184 .pfx = &new_addr, 2185 .plen = ifp->prefix_len, 2186 .ifa_flags = ifp->flags, 2187 .valid_lft = ifp->valid_lft, 2188 .preferred_lft = ifp->prefered_lft, 2189 .scope = ifp->scope, 2190 }; 2191 2192 if (retries > net->ipv6.sysctl.idgen_retries) { 2193 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2194 ifp->idev->dev->name); 2195 goto errdad; 2196 } 2197 2198 new_addr = ifp->addr; 2199 if (ipv6_generate_stable_address(&new_addr, retries, 2200 idev)) 2201 goto errdad; 2202 2203 spin_unlock_bh(&ifp->lock); 2204 2205 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2206 if (max_addresses && 2207 ipv6_count_addresses(idev) >= max_addresses) 2208 goto lock_errdad; 2209 2210 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2211 ifp->idev->dev->name); 2212 2213 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2214 if (IS_ERR(ifp2)) 2215 goto lock_errdad; 2216 2217 spin_lock_bh(&ifp2->lock); 2218 ifp2->stable_privacy_retry = retries; 2219 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2220 spin_unlock_bh(&ifp2->lock); 2221 2222 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2223 in6_ifa_put(ifp2); 2224lock_errdad: 2225 spin_lock_bh(&ifp->lock); 2226 } 2227 2228errdad: 2229 /* transition from _POSTDAD to _ERRDAD */ 2230 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2231 spin_unlock_bh(&ifp->lock); 2232 2233 addrconf_mod_dad_work(ifp, 0); 2234 in6_ifa_put(ifp); 2235} 2236 2237/* Join to solicited addr multicast group. */ 2238void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2239{ 2240 struct in6_addr maddr; 2241 2242 if (READ_ONCE(dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2243 return; 2244 2245 addrconf_addr_solict_mult(addr, &maddr); 2246 ipv6_dev_mc_inc(dev, &maddr); 2247} 2248 2249void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2250{ 2251 struct in6_addr maddr; 2252 2253 if (READ_ONCE(idev->dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2254 return; 2255 2256 addrconf_addr_solict_mult(addr, &maddr); 2257 __ipv6_dev_mc_dec(idev, &maddr); 2258} 2259 2260static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2261{ 2262 struct in6_addr addr; 2263 2264 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2265 return; 2266 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2267 if (ipv6_addr_any(&addr)) 2268 return; 2269 __ipv6_dev_ac_inc(ifp->idev, &addr); 2270} 2271 2272static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2273{ 2274 struct in6_addr addr; 2275 2276 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2277 return; 2278 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2279 if (ipv6_addr_any(&addr)) 2280 return; 2281 __ipv6_dev_ac_dec(ifp->idev, &addr); 2282} 2283 2284static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2285{ 2286 switch (dev->addr_len) { 2287 case ETH_ALEN: 2288 memcpy(eui, dev->dev_addr, 3); 2289 eui[3] = 0xFF; 2290 eui[4] = 0xFE; 2291 memcpy(eui + 5, dev->dev_addr + 3, 3); 2292 break; 2293 case EUI64_ADDR_LEN: 2294 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2295 eui[0] ^= 2; 2296 break; 2297 default: 2298 return -1; 2299 } 2300 2301 return 0; 2302} 2303 2304static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2305{ 2306 const union fwnet_hwaddr *ha; 2307 2308 if (dev->addr_len != FWNET_ALEN) 2309 return -1; 2310 2311 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2312 2313 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2314 eui[0] ^= 2; 2315 return 0; 2316} 2317 2318static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2319{ 2320 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2321 if (dev->addr_len != ARCNET_ALEN) 2322 return -1; 2323 memset(eui, 0, 7); 2324 eui[7] = *(u8 *)dev->dev_addr; 2325 return 0; 2326} 2327 2328static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2329{ 2330 if (dev->addr_len != INFINIBAND_ALEN) 2331 return -1; 2332 memcpy(eui, dev->dev_addr + 12, 8); 2333 eui[0] |= 2; 2334 return 0; 2335} 2336 2337static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2338{ 2339 if (addr == 0) 2340 return -1; 2341 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2342 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2343 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2344 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2345 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2346 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2347 eui[1] = 0; 2348 eui[2] = 0x5E; 2349 eui[3] = 0xFE; 2350 memcpy(eui + 4, &addr, 4); 2351 return 0; 2352} 2353 2354static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2355{ 2356 if (dev->priv_flags & IFF_ISATAP) 2357 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2358 return -1; 2359} 2360 2361static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2362{ 2363 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2364} 2365 2366static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2367{ 2368 memcpy(eui, dev->perm_addr, 3); 2369 memcpy(eui + 5, dev->perm_addr + 3, 3); 2370 eui[3] = 0xFF; 2371 eui[4] = 0xFE; 2372 eui[0] ^= 2; 2373 return 0; 2374} 2375 2376static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2377{ 2378 switch (dev->type) { 2379 case ARPHRD_ETHER: 2380 case ARPHRD_FDDI: 2381 return addrconf_ifid_eui48(eui, dev); 2382 case ARPHRD_ARCNET: 2383 return addrconf_ifid_arcnet(eui, dev); 2384 case ARPHRD_INFINIBAND: 2385 return addrconf_ifid_infiniband(eui, dev); 2386 case ARPHRD_SIT: 2387 return addrconf_ifid_sit(eui, dev); 2388 case ARPHRD_IPGRE: 2389 case ARPHRD_TUNNEL: 2390 return addrconf_ifid_gre(eui, dev); 2391 case ARPHRD_6LOWPAN: 2392 return addrconf_ifid_6lowpan(eui, dev); 2393 case ARPHRD_IEEE1394: 2394 return addrconf_ifid_ieee1394(eui, dev); 2395 case ARPHRD_TUNNEL6: 2396 case ARPHRD_IP6GRE: 2397 case ARPHRD_RAWIP: 2398 return addrconf_ifid_ip6tnl(eui, dev); 2399 } 2400 return -1; 2401} 2402 2403static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2404{ 2405 int err = -1; 2406 struct inet6_ifaddr *ifp; 2407 2408 read_lock_bh(&idev->lock); 2409 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2410 if (ifp->scope > IFA_LINK) 2411 break; 2412 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2413 memcpy(eui, ifp->addr.s6_addr+8, 8); 2414 err = 0; 2415 break; 2416 } 2417 } 2418 read_unlock_bh(&idev->lock); 2419 return err; 2420} 2421 2422/* Generation of a randomized Interface Identifier 2423 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2424 */ 2425 2426static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2427{ 2428regen: 2429 get_random_bytes(&addr->s6_addr[8], 8); 2430 2431 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2432 * check if generated address is not inappropriate: 2433 * 2434 * - Reserved IPv6 Interface Identifiers 2435 * - XXX: already assigned to an address on the device 2436 */ 2437 2438 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2439 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2440 goto regen; 2441 2442 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2443 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2444 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2445 */ 2446 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2447 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2448 goto regen; 2449 2450 /* Reserved subnet anycast addresses */ 2451 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2452 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2453 goto regen; 2454} 2455 2456/* 2457 * Add prefix route. 2458 */ 2459 2460static void 2461addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2462 struct net_device *dev, unsigned long expires, 2463 u32 flags, gfp_t gfp_flags) 2464{ 2465 struct fib6_config cfg = { 2466 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2467 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2468 .fc_ifindex = dev->ifindex, 2469 .fc_expires = expires, 2470 .fc_dst_len = plen, 2471 .fc_flags = RTF_UP | flags, 2472 .fc_nlinfo.nl_net = dev_net(dev), 2473 .fc_protocol = RTPROT_KERNEL, 2474 .fc_type = RTN_UNICAST, 2475 }; 2476 2477 cfg.fc_dst = *pfx; 2478 2479 /* Prevent useless cloning on PtP SIT. 2480 This thing is done here expecting that the whole 2481 class of non-broadcast devices need not cloning. 2482 */ 2483#if IS_ENABLED(CONFIG_IPV6_SIT) 2484 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2485 cfg.fc_flags |= RTF_NONEXTHOP; 2486#endif 2487 2488 ip6_route_add(&cfg, gfp_flags, NULL); 2489} 2490 2491 2492static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2493 int plen, 2494 const struct net_device *dev, 2495 u32 flags, u32 noflags, 2496 bool no_gw) 2497{ 2498 struct fib6_node *fn; 2499 struct fib6_info *rt = NULL; 2500 struct fib6_table *table; 2501 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2502 2503 table = fib6_get_table(dev_net(dev), tb_id); 2504 if (!table) 2505 return NULL; 2506 2507 rcu_read_lock(); 2508 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2509 if (!fn) 2510 goto out; 2511 2512 for_each_fib6_node_rt_rcu(fn) { 2513 /* prefix routes only use builtin fib6_nh */ 2514 if (rt->nh) 2515 continue; 2516 2517 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2518 continue; 2519 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2520 continue; 2521 if ((rt->fib6_flags & flags) != flags) 2522 continue; 2523 if ((rt->fib6_flags & noflags) != 0) 2524 continue; 2525 if (!fib6_info_hold_safe(rt)) 2526 continue; 2527 break; 2528 } 2529out: 2530 rcu_read_unlock(); 2531 return rt; 2532} 2533 2534 2535/* Create "default" multicast route to the interface */ 2536 2537static void addrconf_add_mroute(struct net_device *dev) 2538{ 2539 struct fib6_config cfg = { 2540 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2541 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2542 .fc_ifindex = dev->ifindex, 2543 .fc_dst_len = 8, 2544 .fc_flags = RTF_UP, 2545 .fc_type = RTN_MULTICAST, 2546 .fc_nlinfo.nl_net = dev_net(dev), 2547 .fc_protocol = RTPROT_KERNEL, 2548 }; 2549 2550 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2551 2552 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2553} 2554 2555static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2556{ 2557 struct inet6_dev *idev; 2558 2559 ASSERT_RTNL(); 2560 2561 idev = ipv6_find_idev(dev); 2562 if (IS_ERR(idev)) 2563 return idev; 2564 2565 if (idev->cnf.disable_ipv6) 2566 return ERR_PTR(-EACCES); 2567 2568 /* Add default multicast route */ 2569 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2570 addrconf_add_mroute(dev); 2571 2572 return idev; 2573} 2574 2575static void delete_tempaddrs(struct inet6_dev *idev, 2576 struct inet6_ifaddr *ifp) 2577{ 2578 struct inet6_ifaddr *ift, *tmp; 2579 2580 write_lock_bh(&idev->lock); 2581 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) { 2582 if (ift->ifpub != ifp) 2583 continue; 2584 2585 in6_ifa_hold(ift); 2586 write_unlock_bh(&idev->lock); 2587 ipv6_del_addr(ift); 2588 write_lock_bh(&idev->lock); 2589 } 2590 write_unlock_bh(&idev->lock); 2591} 2592 2593static void manage_tempaddrs(struct inet6_dev *idev, 2594 struct inet6_ifaddr *ifp, 2595 __u32 valid_lft, __u32 prefered_lft, 2596 bool create, unsigned long now) 2597{ 2598 u32 flags; 2599 struct inet6_ifaddr *ift; 2600 2601 read_lock_bh(&idev->lock); 2602 /* update all temporary addresses in the list */ 2603 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2604 int age, max_valid, max_prefered; 2605 2606 if (ifp != ift->ifpub) 2607 continue; 2608 2609 /* RFC 4941 section 3.3: 2610 * If a received option will extend the lifetime of a public 2611 * address, the lifetimes of temporary addresses should 2612 * be extended, subject to the overall constraint that no 2613 * temporary addresses should ever remain "valid" or "preferred" 2614 * for a time longer than (TEMP_VALID_LIFETIME) or 2615 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2616 */ 2617 age = (now - ift->cstamp) / HZ; 2618 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2619 if (max_valid < 0) 2620 max_valid = 0; 2621 2622 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2623 idev->desync_factor - age; 2624 if (max_prefered < 0) 2625 max_prefered = 0; 2626 2627 if (valid_lft > max_valid) 2628 valid_lft = max_valid; 2629 2630 if (prefered_lft > max_prefered) 2631 prefered_lft = max_prefered; 2632 2633 spin_lock(&ift->lock); 2634 flags = ift->flags; 2635 ift->valid_lft = valid_lft; 2636 ift->prefered_lft = prefered_lft; 2637 ift->tstamp = now; 2638 if (prefered_lft > 0) 2639 ift->flags &= ~IFA_F_DEPRECATED; 2640 2641 spin_unlock(&ift->lock); 2642 if (!(flags&IFA_F_TENTATIVE)) 2643 ipv6_ifa_notify(0, ift); 2644 } 2645 2646 /* Also create a temporary address if it's enabled but no temporary 2647 * address currently exists. 2648 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2649 * as part of cleanup (ie. deleting the mngtmpaddr). 2650 * We don't want that to result in creating a new temporary ip address. 2651 */ 2652 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2653 create = true; 2654 2655 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2656 /* When a new public address is created as described 2657 * in [ADDRCONF], also create a new temporary address. 2658 */ 2659 read_unlock_bh(&idev->lock); 2660 ipv6_create_tempaddr(ifp, false); 2661 } else { 2662 read_unlock_bh(&idev->lock); 2663 } 2664} 2665 2666static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2667{ 2668 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2669 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2670} 2671 2672int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2673 const struct prefix_info *pinfo, 2674 struct inet6_dev *in6_dev, 2675 const struct in6_addr *addr, int addr_type, 2676 u32 addr_flags, bool sllao, bool tokenized, 2677 __u32 valid_lft, u32 prefered_lft) 2678{ 2679 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2680 int create = 0, update_lft = 0; 2681 2682 if (!ifp && valid_lft) { 2683 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2684 struct ifa6_config cfg = { 2685 .pfx = addr, 2686 .plen = pinfo->prefix_len, 2687 .ifa_flags = addr_flags, 2688 .valid_lft = valid_lft, 2689 .preferred_lft = prefered_lft, 2690 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2691 .ifa_proto = IFAPROT_KERNEL_RA 2692 }; 2693 2694#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2695 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2696 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2697 !net->ipv6.devconf_all->forwarding && sllao) 2698 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2699#endif 2700 2701 /* Do not allow to create too much of autoconfigured 2702 * addresses; this would be too easy way to crash kernel. 2703 */ 2704 if (!max_addresses || 2705 ipv6_count_addresses(in6_dev) < max_addresses) 2706 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2707 2708 if (IS_ERR_OR_NULL(ifp)) 2709 return -1; 2710 2711 create = 1; 2712 spin_lock_bh(&ifp->lock); 2713 ifp->flags |= IFA_F_MANAGETEMPADDR; 2714 ifp->cstamp = jiffies; 2715 ifp->tokenized = tokenized; 2716 spin_unlock_bh(&ifp->lock); 2717 addrconf_dad_start(ifp); 2718 } 2719 2720 if (ifp) { 2721 u32 flags; 2722 unsigned long now; 2723 u32 stored_lft; 2724 2725 /* update lifetime (RFC2462 5.5.3 e) */ 2726 spin_lock_bh(&ifp->lock); 2727 now = jiffies; 2728 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2729 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2730 else 2731 stored_lft = 0; 2732 2733 /* RFC4862 Section 5.5.3e: 2734 * "Note that the preferred lifetime of the 2735 * corresponding address is always reset to 2736 * the Preferred Lifetime in the received 2737 * Prefix Information option, regardless of 2738 * whether the valid lifetime is also reset or 2739 * ignored." 2740 * 2741 * So we should always update prefered_lft here. 2742 */ 2743 update_lft = !create && stored_lft; 2744 2745 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2746 const u32 minimum_lft = min_t(u32, 2747 stored_lft, MIN_VALID_LIFETIME); 2748 valid_lft = max(valid_lft, minimum_lft); 2749 } 2750 2751 if (update_lft) { 2752 ifp->valid_lft = valid_lft; 2753 ifp->prefered_lft = prefered_lft; 2754 WRITE_ONCE(ifp->tstamp, now); 2755 flags = ifp->flags; 2756 ifp->flags &= ~IFA_F_DEPRECATED; 2757 spin_unlock_bh(&ifp->lock); 2758 2759 if (!(flags&IFA_F_TENTATIVE)) 2760 ipv6_ifa_notify(0, ifp); 2761 } else 2762 spin_unlock_bh(&ifp->lock); 2763 2764 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2765 create, now); 2766 2767 in6_ifa_put(ifp); 2768 addrconf_verify(net); 2769 } 2770 2771 return 0; 2772} 2773EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2774 2775void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2776{ 2777 struct prefix_info *pinfo; 2778 struct fib6_table *table; 2779 __u32 valid_lft; 2780 __u32 prefered_lft; 2781 int addr_type, err; 2782 u32 addr_flags = 0; 2783 struct inet6_dev *in6_dev; 2784 struct net *net = dev_net(dev); 2785 bool ignore_autoconf = false; 2786 2787 pinfo = (struct prefix_info *) opt; 2788 2789 if (len < sizeof(struct prefix_info)) { 2790 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2791 return; 2792 } 2793 2794 /* 2795 * Validation checks ([ADDRCONF], page 19) 2796 */ 2797 2798 addr_type = ipv6_addr_type(&pinfo->prefix); 2799 2800 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2801 return; 2802 2803 valid_lft = ntohl(pinfo->valid); 2804 prefered_lft = ntohl(pinfo->prefered); 2805 2806 if (prefered_lft > valid_lft) { 2807 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2808 return; 2809 } 2810 2811 in6_dev = in6_dev_get(dev); 2812 2813 if (!in6_dev) { 2814 net_dbg_ratelimited("addrconf: device %s not configured\n", 2815 dev->name); 2816 return; 2817 } 2818 2819 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2820 goto put; 2821 2822 /* 2823 * Two things going on here: 2824 * 1) Add routes for on-link prefixes 2825 * 2) Configure prefixes with the auto flag set 2826 */ 2827 2828 if (pinfo->onlink) { 2829 struct fib6_info *rt; 2830 unsigned long rt_expires; 2831 2832 /* Avoid arithmetic overflow. Really, we could 2833 * save rt_expires in seconds, likely valid_lft, 2834 * but it would require division in fib gc, that it 2835 * not good. 2836 */ 2837 if (HZ > USER_HZ) 2838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2839 else 2840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2841 2842 if (addrconf_finite_timeout(rt_expires)) 2843 rt_expires *= HZ; 2844 2845 rt = addrconf_get_prefix_route(&pinfo->prefix, 2846 pinfo->prefix_len, 2847 dev, 2848 RTF_ADDRCONF | RTF_PREFIX_RT, 2849 RTF_DEFAULT, true); 2850 2851 if (rt) { 2852 /* Autoconf prefix route */ 2853 if (valid_lft == 0) { 2854 ip6_del_rt(net, rt, false); 2855 rt = NULL; 2856 } else { 2857 table = rt->fib6_table; 2858 spin_lock_bh(&table->tb6_lock); 2859 2860 if (addrconf_finite_timeout(rt_expires)) { 2861 /* not infinity */ 2862 fib6_set_expires(rt, jiffies + rt_expires); 2863 fib6_add_gc_list(rt); 2864 } else { 2865 fib6_clean_expires(rt); 2866 fib6_may_remove_gc_list(net, rt); 2867 } 2868 2869 spin_unlock_bh(&table->tb6_lock); 2870 } 2871 } else if (valid_lft) { 2872 clock_t expires = 0; 2873 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2874 if (addrconf_finite_timeout(rt_expires)) { 2875 /* not infinity */ 2876 flags |= RTF_EXPIRES; 2877 expires = jiffies_to_clock_t(rt_expires); 2878 } 2879 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2880 0, dev, expires, flags, 2881 GFP_ATOMIC); 2882 } 2883 fib6_info_release(rt); 2884 } 2885 2886 /* Try to figure out our local address for this prefix */ 2887 2888 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd; 2889 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) { 2890 struct in6_addr addr; 2891 bool tokenized = false, dev_addr_generated = false; 2892 2893 if (pinfo->prefix_len == 64) { 2894 memcpy(&addr, &pinfo->prefix, 8); 2895 2896 if (!ipv6_addr_any(&in6_dev->token)) { 2897 read_lock_bh(&in6_dev->lock); 2898 memcpy(addr.s6_addr + 8, 2899 in6_dev->token.s6_addr + 8, 8); 2900 read_unlock_bh(&in6_dev->lock); 2901 tokenized = true; 2902 } else if (is_addr_mode_generate_stable(in6_dev) && 2903 !ipv6_generate_stable_address(&addr, 0, 2904 in6_dev)) { 2905 addr_flags |= IFA_F_STABLE_PRIVACY; 2906 goto ok; 2907 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2908 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2909 goto put; 2910 } else { 2911 dev_addr_generated = true; 2912 } 2913 goto ok; 2914 } 2915 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2916 pinfo->prefix_len); 2917 goto put; 2918 2919ok: 2920 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2921 &addr, addr_type, 2922 addr_flags, sllao, 2923 tokenized, valid_lft, 2924 prefered_lft); 2925 if (err) 2926 goto put; 2927 2928 /* Ignore error case here because previous prefix add addr was 2929 * successful which will be notified. 2930 */ 2931 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2932 addr_type, addr_flags, sllao, 2933 tokenized, valid_lft, 2934 prefered_lft, 2935 dev_addr_generated); 2936 } 2937 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2938put: 2939 in6_dev_put(in6_dev); 2940} 2941 2942static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2943 struct in6_ifreq *ireq) 2944{ 2945 struct ip_tunnel_parm_kern p = { }; 2946 int err; 2947 2948 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2949 return -EADDRNOTAVAIL; 2950 2951 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2952 p.iph.version = 4; 2953 p.iph.ihl = 5; 2954 p.iph.protocol = IPPROTO_IPV6; 2955 p.iph.ttl = 64; 2956 2957 if (!dev->netdev_ops->ndo_tunnel_ctl) 2958 return -EOPNOTSUPP; 2959 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2960 if (err) 2961 return err; 2962 2963 dev = __dev_get_by_name(net, p.name); 2964 if (!dev) 2965 return -ENOBUFS; 2966 return dev_open(dev, NULL); 2967} 2968 2969/* 2970 * Set destination address. 2971 * Special case for SIT interfaces where we create a new "virtual" 2972 * device. 2973 */ 2974int addrconf_set_dstaddr(struct net *net, void __user *arg) 2975{ 2976 struct net_device *dev; 2977 struct in6_ifreq ireq; 2978 int err = -ENODEV; 2979 2980 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2981 return -ENODEV; 2982 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2983 return -EFAULT; 2984 2985 rtnl_net_lock(net); 2986 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2987 if (dev && dev->type == ARPHRD_SIT) 2988 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2989 rtnl_net_unlock(net); 2990 return err; 2991} 2992 2993static int ipv6_mc_config(struct sock *sk, bool join, 2994 const struct in6_addr *addr, int ifindex) 2995{ 2996 int ret; 2997 2998 ASSERT_RTNL(); 2999 3000 lock_sock(sk); 3001 if (join) 3002 ret = ipv6_sock_mc_join(sk, ifindex, addr); 3003 else 3004 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 3005 release_sock(sk); 3006 3007 return ret; 3008} 3009 3010/* 3011 * Manual configuration of address on an interface 3012 */ 3013static int inet6_addr_add(struct net *net, struct net_device *dev, 3014 struct ifa6_config *cfg, clock_t expires, u32 flags, 3015 struct netlink_ext_ack *extack) 3016{ 3017 struct inet6_ifaddr *ifp; 3018 struct inet6_dev *idev; 3019 3020 ASSERT_RTNL_NET(net); 3021 3022 if (cfg->plen > 128) { 3023 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3024 return -EINVAL; 3025 } 3026 3027 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3028 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3029 return -EINVAL; 3030 } 3031 3032 idev = addrconf_add_dev(dev); 3033 if (IS_ERR(idev)) { 3034 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3035 return PTR_ERR(idev); 3036 } 3037 3038 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3039 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3040 true, cfg->pfx, dev->ifindex); 3041 3042 if (ret < 0) { 3043 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3044 return ret; 3045 } 3046 } 3047 3048 cfg->scope = ipv6_addr_scope(cfg->pfx); 3049 3050 ifp = ipv6_add_addr(idev, cfg, true, extack); 3051 if (!IS_ERR(ifp)) { 3052 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3054 ifp->rt_priority, dev, expires, 3055 flags, GFP_KERNEL); 3056 } 3057 3058 /* Send a netlink notification if DAD is enabled and 3059 * optimistic flag is not set 3060 */ 3061 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3062 ipv6_ifa_notify(0, ifp); 3063 /* 3064 * Note that section 3.1 of RFC 4429 indicates 3065 * that the Optimistic flag should not be set for 3066 * manually configured addresses 3067 */ 3068 addrconf_dad_start(ifp); 3069 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3070 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3071 cfg->preferred_lft, true, jiffies); 3072 in6_ifa_put(ifp); 3073 addrconf_verify_rtnl(net); 3074 return 0; 3075 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3076 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3077 cfg->pfx, dev->ifindex); 3078 } 3079 3080 return PTR_ERR(ifp); 3081} 3082 3083static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3084 const struct in6_addr *pfx, unsigned int plen, 3085 struct netlink_ext_ack *extack) 3086{ 3087 struct inet6_ifaddr *ifp; 3088 struct inet6_dev *idev; 3089 struct net_device *dev; 3090 3091 if (plen > 128) { 3092 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3093 return -EINVAL; 3094 } 3095 3096 dev = __dev_get_by_index(net, ifindex); 3097 if (!dev) { 3098 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3099 return -ENODEV; 3100 } 3101 3102 idev = __in6_dev_get_rtnl_net(dev); 3103 if (!idev) { 3104 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3105 return -ENXIO; 3106 } 3107 3108 read_lock_bh(&idev->lock); 3109 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3110 if (ifp->prefix_len == plen && 3111 ipv6_addr_equal(pfx, &ifp->addr)) { 3112 in6_ifa_hold(ifp); 3113 read_unlock_bh(&idev->lock); 3114 3115 if (!(ifp->flags & IFA_F_TEMPORARY) && 3116 (ifp->flags & IFA_F_MANAGETEMPADDR)) 3117 delete_tempaddrs(idev, ifp); 3118 3119 ipv6_del_addr(ifp); 3120 3121 addrconf_verify_rtnl(net); 3122 if (ipv6_addr_is_multicast(pfx)) { 3123 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3124 false, pfx, dev->ifindex); 3125 } 3126 return 0; 3127 } 3128 } 3129 read_unlock_bh(&idev->lock); 3130 3131 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3132 return -EADDRNOTAVAIL; 3133} 3134 3135 3136int addrconf_add_ifaddr(struct net *net, void __user *arg) 3137{ 3138 struct ifa6_config cfg = { 3139 .ifa_flags = IFA_F_PERMANENT, 3140 .preferred_lft = INFINITY_LIFE_TIME, 3141 .valid_lft = INFINITY_LIFE_TIME, 3142 }; 3143 struct net_device *dev; 3144 struct in6_ifreq ireq; 3145 int err; 3146 3147 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3148 return -EPERM; 3149 3150 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3151 return -EFAULT; 3152 3153 cfg.pfx = &ireq.ifr6_addr; 3154 cfg.plen = ireq.ifr6_prefixlen; 3155 3156 rtnl_net_lock(net); 3157 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 3158 if (dev) { 3159 netdev_lock_ops(dev); 3160 err = inet6_addr_add(net, dev, &cfg, 0, 0, NULL); 3161 netdev_unlock_ops(dev); 3162 } else { 3163 err = -ENODEV; 3164 } 3165 rtnl_net_unlock(net); 3166 return err; 3167} 3168 3169int addrconf_del_ifaddr(struct net *net, void __user *arg) 3170{ 3171 struct in6_ifreq ireq; 3172 int err; 3173 3174 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3175 return -EPERM; 3176 3177 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3178 return -EFAULT; 3179 3180 rtnl_net_lock(net); 3181 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3182 ireq.ifr6_prefixlen, NULL); 3183 rtnl_net_unlock(net); 3184 return err; 3185} 3186 3187static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3188 int plen, int scope, u8 proto) 3189{ 3190 struct inet6_ifaddr *ifp; 3191 struct ifa6_config cfg = { 3192 .pfx = addr, 3193 .plen = plen, 3194 .ifa_flags = IFA_F_PERMANENT, 3195 .valid_lft = INFINITY_LIFE_TIME, 3196 .preferred_lft = INFINITY_LIFE_TIME, 3197 .scope = scope, 3198 .ifa_proto = proto 3199 }; 3200 3201 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3202 if (!IS_ERR(ifp)) { 3203 spin_lock_bh(&ifp->lock); 3204 ifp->flags &= ~IFA_F_TENTATIVE; 3205 spin_unlock_bh(&ifp->lock); 3206 rt_genid_bump_ipv6(dev_net(idev->dev)); 3207 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3208 in6_ifa_put(ifp); 3209 } 3210} 3211 3212#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) 3213static void add_v4_addrs(struct inet6_dev *idev) 3214{ 3215 struct in6_addr addr; 3216 struct net_device *dev; 3217 struct net *net = dev_net(idev->dev); 3218 int scope, plen; 3219 u32 pflags = 0; 3220 3221 ASSERT_RTNL(); 3222 3223 memset(&addr, 0, sizeof(struct in6_addr)); 3224 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3225 3226 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3227 scope = IPV6_ADDR_COMPATv4; 3228 plen = 96; 3229 pflags |= RTF_NONEXTHOP; 3230 } else { 3231 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3232 return; 3233 3234 addr.s6_addr32[0] = htonl(0xfe800000); 3235 scope = IFA_LINK; 3236 plen = 64; 3237 } 3238 3239 if (addr.s6_addr32[3]) { 3240 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3241 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3242 GFP_KERNEL); 3243 return; 3244 } 3245 3246 for_each_netdev(net, dev) { 3247 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3248 if (in_dev && (dev->flags & IFF_UP)) { 3249 struct in_ifaddr *ifa; 3250 int flag = scope; 3251 3252 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3253 addr.s6_addr32[3] = ifa->ifa_local; 3254 3255 if (ifa->ifa_scope == RT_SCOPE_LINK) 3256 continue; 3257 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3258 if (idev->dev->flags&IFF_POINTOPOINT) 3259 continue; 3260 flag |= IFA_HOST; 3261 } 3262 3263 add_addr(idev, &addr, plen, flag, 3264 IFAPROT_UNSPEC); 3265 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3266 0, pflags, GFP_KERNEL); 3267 } 3268 } 3269 } 3270} 3271#endif 3272 3273static void init_loopback(struct net_device *dev) 3274{ 3275 struct inet6_dev *idev; 3276 3277 /* ::1 */ 3278 3279 ASSERT_RTNL(); 3280 3281 idev = ipv6_find_idev(dev); 3282 if (IS_ERR(idev)) { 3283 pr_debug("%s: add_dev failed\n", __func__); 3284 return; 3285 } 3286 3287 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3288} 3289 3290void addrconf_add_linklocal(struct inet6_dev *idev, 3291 const struct in6_addr *addr, u32 flags) 3292{ 3293 struct ifa6_config cfg = { 3294 .pfx = addr, 3295 .plen = 64, 3296 .ifa_flags = flags | IFA_F_PERMANENT, 3297 .valid_lft = INFINITY_LIFE_TIME, 3298 .preferred_lft = INFINITY_LIFE_TIME, 3299 .scope = IFA_LINK, 3300 .ifa_proto = IFAPROT_KERNEL_LL 3301 }; 3302 struct inet6_ifaddr *ifp; 3303 3304#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3305 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3306 READ_ONCE(idev->cnf.optimistic_dad)) && 3307 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3308 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3309#endif 3310 3311 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3312 if (!IS_ERR(ifp)) { 3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3314 0, 0, GFP_ATOMIC); 3315 addrconf_dad_start(ifp); 3316 in6_ifa_put(ifp); 3317 } 3318} 3319EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3320 3321static bool ipv6_reserved_interfaceid(struct in6_addr address) 3322{ 3323 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3324 return true; 3325 3326 if (address.s6_addr32[2] == htonl(0x02005eff) && 3327 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3328 return true; 3329 3330 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3331 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3332 return true; 3333 3334 return false; 3335} 3336 3337static int ipv6_generate_stable_address(struct in6_addr *address, 3338 u8 dad_count, 3339 const struct inet6_dev *idev) 3340{ 3341 static DEFINE_SPINLOCK(lock); 3342 static __u32 digest[SHA1_DIGEST_WORDS]; 3343 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3344 3345 static union { 3346 char __data[SHA1_BLOCK_SIZE]; 3347 struct { 3348 struct in6_addr secret; 3349 __be32 prefix[2]; 3350 unsigned char hwaddr[MAX_ADDR_LEN]; 3351 u8 dad_count; 3352 } __packed; 3353 } data; 3354 3355 struct in6_addr secret; 3356 struct in6_addr temp; 3357 struct net *net = dev_net(idev->dev); 3358 3359 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3360 3361 if (idev->cnf.stable_secret.initialized) 3362 secret = idev->cnf.stable_secret.secret; 3363 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3364 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3365 else 3366 return -1; 3367 3368retry: 3369 spin_lock_bh(&lock); 3370 3371 sha1_init_raw(digest); 3372 memset(&data, 0, sizeof(data)); 3373 memset(workspace, 0, sizeof(workspace)); 3374 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3375 data.prefix[0] = address->s6_addr32[0]; 3376 data.prefix[1] = address->s6_addr32[1]; 3377 data.secret = secret; 3378 data.dad_count = dad_count; 3379 3380 sha1_transform(digest, data.__data, workspace); 3381 3382 temp = *address; 3383 temp.s6_addr32[2] = (__force __be32)digest[0]; 3384 temp.s6_addr32[3] = (__force __be32)digest[1]; 3385 3386 spin_unlock_bh(&lock); 3387 3388 if (ipv6_reserved_interfaceid(temp)) { 3389 dad_count++; 3390 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3391 return -1; 3392 goto retry; 3393 } 3394 3395 *address = temp; 3396 return 0; 3397} 3398 3399static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3400{ 3401 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3402 3403 if (s->initialized) 3404 return; 3405 s = &idev->cnf.stable_secret; 3406 get_random_bytes(&s->secret, sizeof(s->secret)); 3407 s->initialized = true; 3408} 3409 3410static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3411{ 3412 struct in6_addr addr; 3413 3414 /* no link local addresses on L3 master devices */ 3415 if (netif_is_l3_master(idev->dev)) 3416 return; 3417 3418 /* no link local addresses on devices flagged as slaves */ 3419 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3420 return; 3421 3422 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3423 3424 switch (idev->cnf.addr_gen_mode) { 3425 case IN6_ADDR_GEN_MODE_RANDOM: 3426 ipv6_gen_mode_random_init(idev); 3427 fallthrough; 3428 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3429 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3430 addrconf_add_linklocal(idev, &addr, 3431 IFA_F_STABLE_PRIVACY); 3432 else if (prefix_route) 3433 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3434 0, 0, GFP_KERNEL); 3435 break; 3436 case IN6_ADDR_GEN_MODE_EUI64: 3437 /* addrconf_add_linklocal also adds a prefix_route and we 3438 * only need to care about prefix routes if ipv6_generate_eui64 3439 * couldn't generate one. 3440 */ 3441 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3442 addrconf_add_linklocal(idev, &addr, 0); 3443 else if (prefix_route) 3444 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3445 0, 0, GFP_KERNEL); 3446 break; 3447 case IN6_ADDR_GEN_MODE_NONE: 3448 default: 3449 /* will not add any link local address */ 3450 break; 3451 } 3452} 3453 3454static void addrconf_dev_config(struct net_device *dev) 3455{ 3456 struct inet6_dev *idev; 3457 3458 ASSERT_RTNL(); 3459 3460 if ((dev->type != ARPHRD_ETHER) && 3461 (dev->type != ARPHRD_FDDI) && 3462 (dev->type != ARPHRD_ARCNET) && 3463 (dev->type != ARPHRD_INFINIBAND) && 3464 (dev->type != ARPHRD_IEEE1394) && 3465 (dev->type != ARPHRD_TUNNEL6) && 3466 (dev->type != ARPHRD_6LOWPAN) && 3467 (dev->type != ARPHRD_IP6GRE) && 3468 (dev->type != ARPHRD_TUNNEL) && 3469 (dev->type != ARPHRD_NONE) && 3470 (dev->type != ARPHRD_RAWIP)) { 3471 /* Alas, we support only Ethernet autoconfiguration. */ 3472 idev = __in6_dev_get(dev); 3473 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3474 dev->flags & IFF_MULTICAST) 3475 ipv6_mc_up(idev); 3476 return; 3477 } 3478 3479 idev = addrconf_add_dev(dev); 3480 if (IS_ERR(idev)) 3481 return; 3482 3483 /* this device type has no EUI support */ 3484 if (dev->type == ARPHRD_NONE && 3485 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3486 WRITE_ONCE(idev->cnf.addr_gen_mode, 3487 IN6_ADDR_GEN_MODE_RANDOM); 3488 3489 addrconf_addr_gen(idev, false); 3490} 3491 3492#if IS_ENABLED(CONFIG_IPV6_SIT) 3493static void addrconf_sit_config(struct net_device *dev) 3494{ 3495 struct inet6_dev *idev; 3496 3497 ASSERT_RTNL(); 3498 3499 /* 3500 * Configure the tunnel with one of our IPv4 3501 * addresses... we should configure all of 3502 * our v4 addrs in the tunnel 3503 */ 3504 3505 idev = ipv6_find_idev(dev); 3506 if (IS_ERR(idev)) { 3507 pr_debug("%s: add_dev failed\n", __func__); 3508 return; 3509 } 3510 3511 if (dev->priv_flags & IFF_ISATAP) { 3512 addrconf_addr_gen(idev, false); 3513 return; 3514 } 3515 3516 add_v4_addrs(idev); 3517 3518 if (dev->flags&IFF_POINTOPOINT) 3519 addrconf_add_mroute(dev); 3520} 3521#endif 3522 3523#if IS_ENABLED(CONFIG_NET_IPGRE) 3524static void addrconf_gre_config(struct net_device *dev) 3525{ 3526 struct inet6_dev *idev; 3527 3528 ASSERT_RTNL(); 3529 3530 idev = addrconf_add_dev(dev); 3531 if (IS_ERR(idev)) 3532 return; 3533 3534 /* Generate the IPv6 link-local address using addrconf_addr_gen(), 3535 * unless we have an IPv4 GRE device not bound to an IP address and 3536 * which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this 3537 * case). Such devices fall back to add_v4_addrs() instead. 3538 */ 3539 if (!(*(__be32 *)dev->dev_addr == 0 && 3540 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) { 3541 addrconf_addr_gen(idev, true); 3542 return; 3543 } 3544 3545 add_v4_addrs(idev); 3546} 3547#endif 3548 3549static void addrconf_init_auto_addrs(struct net_device *dev) 3550{ 3551 switch (dev->type) { 3552#if IS_ENABLED(CONFIG_IPV6_SIT) 3553 case ARPHRD_SIT: 3554 addrconf_sit_config(dev); 3555 break; 3556#endif 3557#if IS_ENABLED(CONFIG_NET_IPGRE) 3558 case ARPHRD_IPGRE: 3559 addrconf_gre_config(dev); 3560 break; 3561#endif 3562 case ARPHRD_LOOPBACK: 3563 init_loopback(dev); 3564 break; 3565 3566 default: 3567 addrconf_dev_config(dev); 3568 break; 3569 } 3570} 3571 3572static int fixup_permanent_addr(struct net *net, 3573 struct inet6_dev *idev, 3574 struct inet6_ifaddr *ifp) 3575{ 3576 /* !fib6_node means the host route was removed from the 3577 * FIB, for example, if 'lo' device is taken down. In that 3578 * case regenerate the host route. 3579 */ 3580 if (!ifp->rt || !ifp->rt->fib6_node) { 3581 struct fib6_info *f6i, *prev; 3582 3583 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3584 GFP_ATOMIC, NULL); 3585 if (IS_ERR(f6i)) 3586 return PTR_ERR(f6i); 3587 3588 /* ifp->rt can be accessed outside of rtnl */ 3589 spin_lock(&ifp->lock); 3590 prev = ifp->rt; 3591 ifp->rt = f6i; 3592 spin_unlock(&ifp->lock); 3593 3594 fib6_info_release(prev); 3595 } 3596 3597 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3598 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3599 ifp->rt_priority, idev->dev, 0, 0, 3600 GFP_ATOMIC); 3601 } 3602 3603 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3604 addrconf_dad_start(ifp); 3605 3606 return 0; 3607} 3608 3609static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3610{ 3611 struct inet6_ifaddr *ifp, *tmp; 3612 struct inet6_dev *idev; 3613 3614 idev = __in6_dev_get(dev); 3615 if (!idev) 3616 return; 3617 3618 write_lock_bh(&idev->lock); 3619 3620 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3621 if ((ifp->flags & IFA_F_PERMANENT) && 3622 fixup_permanent_addr(net, idev, ifp) < 0) { 3623 write_unlock_bh(&idev->lock); 3624 3625 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3626 idev->dev->name, &ifp->addr); 3627 in6_ifa_hold(ifp); 3628 ipv6_del_addr(ifp); 3629 write_lock_bh(&idev->lock); 3630 } 3631 } 3632 3633 write_unlock_bh(&idev->lock); 3634} 3635 3636static int addrconf_notify(struct notifier_block *this, unsigned long event, 3637 void *ptr) 3638{ 3639 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3640 struct netdev_notifier_change_info *change_info; 3641 struct netdev_notifier_changeupper_info *info; 3642 struct inet6_dev *idev = __in6_dev_get(dev); 3643 struct net *net = dev_net(dev); 3644 int run_pending = 0; 3645 int err; 3646 3647 switch (event) { 3648 case NETDEV_REGISTER: 3649 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3650 idev = ipv6_add_dev(dev); 3651 if (IS_ERR(idev)) 3652 return notifier_from_errno(PTR_ERR(idev)); 3653 } 3654 break; 3655 3656 case NETDEV_CHANGEMTU: 3657 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3658 if (dev->mtu < IPV6_MIN_MTU) { 3659 addrconf_ifdown(dev, dev != net->loopback_dev); 3660 break; 3661 } 3662 3663 if (idev) { 3664 rt6_mtu_change(dev, dev->mtu); 3665 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3666 break; 3667 } 3668 3669 /* allocate new idev */ 3670 idev = ipv6_add_dev(dev); 3671 if (IS_ERR(idev)) 3672 break; 3673 3674 /* device is still not ready */ 3675 if (!(idev->if_flags & IF_READY)) 3676 break; 3677 3678 run_pending = 1; 3679 fallthrough; 3680 case NETDEV_UP: 3681 case NETDEV_CHANGE: 3682 if (idev && idev->cnf.disable_ipv6) 3683 break; 3684 3685 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3686 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3687 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3688 ipv6_mc_up(idev); 3689 break; 3690 } 3691 3692 if (event == NETDEV_UP) { 3693 /* restore routes for permanent addresses */ 3694 addrconf_permanent_addr(net, dev); 3695 3696 if (!addrconf_link_ready(dev)) { 3697 /* device is not ready yet. */ 3698 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3699 dev->name); 3700 break; 3701 } 3702 3703 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3704 idev = ipv6_add_dev(dev); 3705 3706 if (!IS_ERR_OR_NULL(idev)) { 3707 idev->if_flags |= IF_READY; 3708 run_pending = 1; 3709 } 3710 } else if (event == NETDEV_CHANGE) { 3711 if (!addrconf_link_ready(dev)) { 3712 /* device is still not ready. */ 3713 rt6_sync_down_dev(dev, event); 3714 break; 3715 } 3716 3717 if (!IS_ERR_OR_NULL(idev)) { 3718 if (idev->if_flags & IF_READY) { 3719 /* device is already configured - 3720 * but resend MLD reports, we might 3721 * have roamed and need to update 3722 * multicast snooping switches 3723 */ 3724 ipv6_mc_up(idev); 3725 change_info = ptr; 3726 if (change_info->flags_changed & IFF_NOARP) 3727 addrconf_dad_run(idev, true); 3728 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3729 break; 3730 } 3731 idev->if_flags |= IF_READY; 3732 } 3733 3734 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3735 dev->name); 3736 3737 run_pending = 1; 3738 } 3739 3740 addrconf_init_auto_addrs(dev); 3741 3742 if (!IS_ERR_OR_NULL(idev)) { 3743 if (run_pending) 3744 addrconf_dad_run(idev, false); 3745 3746 /* Device has an address by now */ 3747 rt6_sync_up(dev, RTNH_F_DEAD); 3748 3749 /* 3750 * If the MTU changed during the interface down, 3751 * when the interface up, the changed MTU must be 3752 * reflected in the idev as well as routers. 3753 */ 3754 if (idev->cnf.mtu6 != dev->mtu && 3755 dev->mtu >= IPV6_MIN_MTU) { 3756 rt6_mtu_change(dev, dev->mtu); 3757 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3758 } 3759 WRITE_ONCE(idev->tstamp, jiffies); 3760 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3761 3762 /* 3763 * If the changed mtu during down is lower than 3764 * IPV6_MIN_MTU stop IPv6 on this interface. 3765 */ 3766 if (dev->mtu < IPV6_MIN_MTU) 3767 addrconf_ifdown(dev, dev != net->loopback_dev); 3768 } 3769 break; 3770 3771 case NETDEV_DOWN: 3772 case NETDEV_UNREGISTER: 3773 /* 3774 * Remove all addresses from this interface. 3775 */ 3776 addrconf_ifdown(dev, event != NETDEV_DOWN); 3777 break; 3778 3779 case NETDEV_CHANGENAME: 3780 if (idev) { 3781 snmp6_unregister_dev(idev); 3782 addrconf_sysctl_unregister(idev); 3783 err = addrconf_sysctl_register(idev); 3784 if (err) 3785 return notifier_from_errno(err); 3786 err = snmp6_register_dev(idev); 3787 if (err) { 3788 addrconf_sysctl_unregister(idev); 3789 return notifier_from_errno(err); 3790 } 3791 } 3792 break; 3793 3794 case NETDEV_PRE_TYPE_CHANGE: 3795 case NETDEV_POST_TYPE_CHANGE: 3796 if (idev) 3797 addrconf_type_change(dev, event); 3798 break; 3799 3800 case NETDEV_CHANGEUPPER: 3801 info = ptr; 3802 3803 /* flush all routes if dev is linked to or unlinked from 3804 * an L3 master device (e.g., VRF) 3805 */ 3806 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3807 addrconf_ifdown(dev, false); 3808 } 3809 3810 return NOTIFY_OK; 3811} 3812 3813/* 3814 * addrconf module should be notified of a device going up 3815 */ 3816static struct notifier_block ipv6_dev_notf = { 3817 .notifier_call = addrconf_notify, 3818 .priority = ADDRCONF_NOTIFY_PRIORITY, 3819}; 3820 3821static void addrconf_type_change(struct net_device *dev, unsigned long event) 3822{ 3823 struct inet6_dev *idev; 3824 ASSERT_RTNL(); 3825 3826 idev = __in6_dev_get(dev); 3827 3828 if (event == NETDEV_POST_TYPE_CHANGE) 3829 ipv6_mc_remap(idev); 3830 else if (event == NETDEV_PRE_TYPE_CHANGE) 3831 ipv6_mc_unmap(idev); 3832} 3833 3834static bool addr_is_local(const struct in6_addr *addr) 3835{ 3836 return ipv6_addr_type(addr) & 3837 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3838} 3839 3840static int addrconf_ifdown(struct net_device *dev, bool unregister) 3841{ 3842 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3843 struct net *net = dev_net(dev); 3844 struct inet6_dev *idev; 3845 struct inet6_ifaddr *ifa; 3846 LIST_HEAD(tmp_addr_list); 3847 bool keep_addr = false; 3848 bool was_ready; 3849 int state, i; 3850 3851 ASSERT_RTNL(); 3852 3853 rt6_disable_ip(dev, event); 3854 3855 idev = __in6_dev_get(dev); 3856 if (!idev) 3857 return -ENODEV; 3858 3859 /* 3860 * Step 1: remove reference to ipv6 device from parent device. 3861 * Do not dev_put! 3862 */ 3863 if (unregister) { 3864 WRITE_ONCE(idev->dead, 1); 3865 3866 /* protected by rtnl_lock */ 3867 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3868 3869 /* Step 1.5: remove snmp6 entry */ 3870 snmp6_unregister_dev(idev); 3871 3872 } 3873 3874 /* combine the user config with event to determine if permanent 3875 * addresses are to be removed from address hash table 3876 */ 3877 if (!unregister && !idev->cnf.disable_ipv6) { 3878 /* aggregate the system setting and interface setting */ 3879 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3880 3881 if (!_keep_addr) 3882 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3883 3884 keep_addr = (_keep_addr > 0); 3885 } 3886 3887 /* Step 2: clear hash table */ 3888 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3889 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3890 3891 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3892restart: 3893 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3894 if (ifa->idev == idev) { 3895 addrconf_del_dad_work(ifa); 3896 /* combined flag + permanent flag decide if 3897 * address is retained on a down event 3898 */ 3899 if (!keep_addr || 3900 !(ifa->flags & IFA_F_PERMANENT) || 3901 addr_is_local(&ifa->addr)) { 3902 hlist_del_init_rcu(&ifa->addr_lst); 3903 goto restart; 3904 } 3905 } 3906 } 3907 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3908 } 3909 3910 write_lock_bh(&idev->lock); 3911 3912 addrconf_del_rs_timer(idev); 3913 3914 /* Step 2: clear flags for stateless addrconf, repeated down 3915 * detection 3916 */ 3917 was_ready = idev->if_flags & IF_READY; 3918 if (!unregister) 3919 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3920 3921 /* Step 3: clear tempaddr list */ 3922 while (!list_empty(&idev->tempaddr_list)) { 3923 ifa = list_first_entry(&idev->tempaddr_list, 3924 struct inet6_ifaddr, tmp_list); 3925 list_del(&ifa->tmp_list); 3926 write_unlock_bh(&idev->lock); 3927 spin_lock_bh(&ifa->lock); 3928 3929 if (ifa->ifpub) { 3930 in6_ifa_put(ifa->ifpub); 3931 ifa->ifpub = NULL; 3932 } 3933 spin_unlock_bh(&ifa->lock); 3934 in6_ifa_put(ifa); 3935 write_lock_bh(&idev->lock); 3936 } 3937 3938 list_for_each_entry(ifa, &idev->addr_list, if_list) 3939 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3940 write_unlock_bh(&idev->lock); 3941 3942 while (!list_empty(&tmp_addr_list)) { 3943 struct fib6_info *rt = NULL; 3944 bool keep; 3945 3946 ifa = list_first_entry(&tmp_addr_list, 3947 struct inet6_ifaddr, if_list_aux); 3948 list_del(&ifa->if_list_aux); 3949 3950 addrconf_del_dad_work(ifa); 3951 3952 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3953 !addr_is_local(&ifa->addr); 3954 3955 spin_lock_bh(&ifa->lock); 3956 3957 if (keep) { 3958 /* set state to skip the notifier below */ 3959 state = INET6_IFADDR_STATE_DEAD; 3960 ifa->state = INET6_IFADDR_STATE_PREDAD; 3961 if (!(ifa->flags & IFA_F_NODAD)) 3962 ifa->flags |= IFA_F_TENTATIVE; 3963 3964 rt = ifa->rt; 3965 ifa->rt = NULL; 3966 } else { 3967 state = ifa->state; 3968 ifa->state = INET6_IFADDR_STATE_DEAD; 3969 } 3970 3971 spin_unlock_bh(&ifa->lock); 3972 3973 if (rt) 3974 ip6_del_rt(net, rt, false); 3975 3976 if (state != INET6_IFADDR_STATE_DEAD) { 3977 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3978 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3979 } else { 3980 if (idev->cnf.forwarding) 3981 addrconf_leave_anycast(ifa); 3982 addrconf_leave_solict(ifa->idev, &ifa->addr); 3983 } 3984 3985 if (!keep) { 3986 write_lock_bh(&idev->lock); 3987 list_del_rcu(&ifa->if_list); 3988 write_unlock_bh(&idev->lock); 3989 in6_ifa_put(ifa); 3990 } 3991 } 3992 3993 /* Step 5: Discard anycast and multicast list */ 3994 if (unregister) { 3995 ipv6_ac_destroy_dev(idev); 3996 ipv6_mc_destroy_dev(idev); 3997 } else if (was_ready) { 3998 ipv6_mc_down(idev); 3999 } 4000 4001 WRITE_ONCE(idev->tstamp, jiffies); 4002 idev->ra_mtu = 0; 4003 4004 /* Last: Shot the device (if unregistered) */ 4005 if (unregister) { 4006 addrconf_sysctl_unregister(idev); 4007 neigh_parms_release(&nd_tbl, idev->nd_parms); 4008 neigh_ifdown(&nd_tbl, dev); 4009 in6_dev_put(idev); 4010 } 4011 return 0; 4012} 4013 4014static void addrconf_rs_timer(struct timer_list *t) 4015{ 4016 struct inet6_dev *idev = timer_container_of(idev, t, rs_timer); 4017 struct net_device *dev = idev->dev; 4018 struct in6_addr lladdr; 4019 int rtr_solicits; 4020 4021 write_lock(&idev->lock); 4022 if (idev->dead || !(idev->if_flags & IF_READY)) 4023 goto out; 4024 4025 if (!ipv6_accept_ra(idev)) 4026 goto out; 4027 4028 /* Announcement received after solicitation was sent */ 4029 if (idev->if_flags & IF_RA_RCVD) 4030 goto out; 4031 4032 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4033 4034 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4035 write_unlock(&idev->lock); 4036 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4037 ndisc_send_rs(dev, &lladdr, 4038 &in6addr_linklocal_allrouters); 4039 else 4040 goto put; 4041 4042 write_lock(&idev->lock); 4043 idev->rs_interval = rfc3315_s14_backoff_update( 4044 idev->rs_interval, 4045 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4046 /* The wait after the last probe can be shorter */ 4047 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4048 READ_ONCE(idev->cnf.rtr_solicits)) ? 4049 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4050 idev->rs_interval); 4051 } else { 4052 /* 4053 * Note: we do not support deprecated "all on-link" 4054 * assumption any longer. 4055 */ 4056 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4057 } 4058 4059out: 4060 write_unlock(&idev->lock); 4061put: 4062 in6_dev_put(idev); 4063} 4064 4065/* 4066 * Duplicate Address Detection 4067 */ 4068static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4069{ 4070 struct inet6_dev *idev = ifp->idev; 4071 unsigned long rand_num; 4072 u64 nonce; 4073 4074 if (ifp->flags & IFA_F_OPTIMISTIC) 4075 rand_num = 0; 4076 else 4077 rand_num = get_random_u32_below( 4078 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4079 4080 nonce = 0; 4081 if (READ_ONCE(idev->cnf.enhanced_dad) || 4082 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4083 do 4084 get_random_bytes(&nonce, 6); 4085 while (nonce == 0); 4086 } 4087 ifp->dad_nonce = nonce; 4088 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4089 addrconf_mod_dad_work(ifp, rand_num); 4090} 4091 4092static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4093{ 4094 struct inet6_dev *idev = ifp->idev; 4095 struct net_device *dev = idev->dev; 4096 bool bump_id, notify = false; 4097 struct net *net; 4098 4099 addrconf_join_solict(dev, &ifp->addr); 4100 4101 read_lock_bh(&idev->lock); 4102 spin_lock(&ifp->lock); 4103 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4104 goto out; 4105 4106 net = dev_net(dev); 4107 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4108 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4109 READ_ONCE(idev->cnf.accept_dad) < 1) || 4110 !(ifp->flags&IFA_F_TENTATIVE) || 4111 ifp->flags & IFA_F_NODAD) { 4112 bool send_na = false; 4113 4114 if (ifp->flags & IFA_F_TENTATIVE && 4115 !(ifp->flags & IFA_F_OPTIMISTIC)) 4116 send_na = true; 4117 bump_id = ifp->flags & IFA_F_TENTATIVE; 4118 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4119 spin_unlock(&ifp->lock); 4120 read_unlock_bh(&idev->lock); 4121 4122 addrconf_dad_completed(ifp, bump_id, send_na); 4123 return; 4124 } 4125 4126 if (!(idev->if_flags & IF_READY)) { 4127 spin_unlock(&ifp->lock); 4128 read_unlock_bh(&idev->lock); 4129 /* 4130 * If the device is not ready: 4131 * - keep it tentative if it is a permanent address. 4132 * - otherwise, kill it. 4133 */ 4134 in6_ifa_hold(ifp); 4135 addrconf_dad_stop(ifp, 0); 4136 return; 4137 } 4138 4139 /* 4140 * Optimistic nodes can start receiving 4141 * Frames right away 4142 */ 4143 if (ifp->flags & IFA_F_OPTIMISTIC) { 4144 ip6_ins_rt(net, ifp->rt); 4145 if (ipv6_use_optimistic_addr(net, idev)) { 4146 /* Because optimistic nodes can use this address, 4147 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4148 */ 4149 notify = true; 4150 } 4151 } 4152 4153 addrconf_dad_kick(ifp); 4154out: 4155 spin_unlock(&ifp->lock); 4156 read_unlock_bh(&idev->lock); 4157 if (notify) 4158 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4159} 4160 4161static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4162{ 4163 bool begin_dad = false; 4164 4165 spin_lock_bh(&ifp->lock); 4166 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4167 ifp->state = INET6_IFADDR_STATE_PREDAD; 4168 begin_dad = true; 4169 } 4170 spin_unlock_bh(&ifp->lock); 4171 4172 if (begin_dad) 4173 addrconf_mod_dad_work(ifp, 0); 4174} 4175 4176static void addrconf_dad_work(struct work_struct *w) 4177{ 4178 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4179 struct inet6_ifaddr, 4180 dad_work); 4181 struct inet6_dev *idev = ifp->idev; 4182 bool bump_id, disable_ipv6 = false; 4183 struct in6_addr mcaddr; 4184 struct net *net; 4185 4186 enum { 4187 DAD_PROCESS, 4188 DAD_BEGIN, 4189 DAD_ABORT, 4190 } action = DAD_PROCESS; 4191 4192 net = dev_net(idev->dev); 4193 4194 rtnl_net_lock(net); 4195 4196 spin_lock_bh(&ifp->lock); 4197 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4198 action = DAD_BEGIN; 4199 ifp->state = INET6_IFADDR_STATE_DAD; 4200 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4201 action = DAD_ABORT; 4202 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4203 4204 if ((READ_ONCE(net->ipv6.devconf_all->accept_dad) > 1 || 4205 READ_ONCE(idev->cnf.accept_dad) > 1) && 4206 !idev->cnf.disable_ipv6 && 4207 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4208 struct in6_addr addr; 4209 4210 addr.s6_addr32[0] = htonl(0xfe800000); 4211 addr.s6_addr32[1] = 0; 4212 4213 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4214 ipv6_addr_equal(&ifp->addr, &addr)) { 4215 /* DAD failed for link-local based on MAC */ 4216 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4217 4218 pr_info("%s: IPv6 being disabled!\n", 4219 ifp->idev->dev->name); 4220 disable_ipv6 = true; 4221 } 4222 } 4223 } 4224 spin_unlock_bh(&ifp->lock); 4225 4226 if (action == DAD_BEGIN) { 4227 addrconf_dad_begin(ifp); 4228 goto out; 4229 } else if (action == DAD_ABORT) { 4230 in6_ifa_hold(ifp); 4231 addrconf_dad_stop(ifp, 1); 4232 if (disable_ipv6) 4233 addrconf_ifdown(idev->dev, false); 4234 goto out; 4235 } 4236 4237 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4238 goto out; 4239 4240 write_lock_bh(&idev->lock); 4241 if (idev->dead || !(idev->if_flags & IF_READY)) { 4242 write_unlock_bh(&idev->lock); 4243 goto out; 4244 } 4245 4246 spin_lock(&ifp->lock); 4247 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4248 spin_unlock(&ifp->lock); 4249 write_unlock_bh(&idev->lock); 4250 goto out; 4251 } 4252 4253 if (ifp->dad_probes == 0) { 4254 bool send_na = false; 4255 4256 /* 4257 * DAD was successful 4258 */ 4259 4260 if (ifp->flags & IFA_F_TENTATIVE && 4261 !(ifp->flags & IFA_F_OPTIMISTIC)) 4262 send_na = true; 4263 bump_id = ifp->flags & IFA_F_TENTATIVE; 4264 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4265 spin_unlock(&ifp->lock); 4266 write_unlock_bh(&idev->lock); 4267 4268 addrconf_dad_completed(ifp, bump_id, send_na); 4269 4270 goto out; 4271 } 4272 4273 ifp->dad_probes--; 4274 addrconf_mod_dad_work(ifp, 4275 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4276 HZ/100)); 4277 spin_unlock(&ifp->lock); 4278 write_unlock_bh(&idev->lock); 4279 4280 /* send a neighbour solicitation for our addr */ 4281 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4282 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4283 ifp->dad_nonce); 4284out: 4285 in6_ifa_put(ifp); 4286 rtnl_net_unlock(net); 4287} 4288 4289/* ifp->idev must be at least read locked */ 4290static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4291{ 4292 struct inet6_ifaddr *ifpiter; 4293 struct inet6_dev *idev = ifp->idev; 4294 4295 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4296 if (ifpiter->scope > IFA_LINK) 4297 break; 4298 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4299 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4300 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4301 IFA_F_PERMANENT) 4302 return false; 4303 } 4304 return true; 4305} 4306 4307static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4308 bool send_na) 4309{ 4310 struct net_device *dev = ifp->idev->dev; 4311 struct in6_addr lladdr; 4312 bool send_rs, send_mld; 4313 4314 addrconf_del_dad_work(ifp); 4315 4316 /* 4317 * Configure the address for reception. Now it is valid. 4318 */ 4319 4320 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4321 4322 /* If added prefix is link local and we are prepared to process 4323 router advertisements, start sending router solicitations. 4324 */ 4325 4326 read_lock_bh(&ifp->idev->lock); 4327 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4328 send_rs = send_mld && 4329 ipv6_accept_ra(ifp->idev) && 4330 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4331 (dev->flags & IFF_LOOPBACK) == 0 && 4332 (dev->type != ARPHRD_TUNNEL) && 4333 !netif_is_team_port(dev); 4334 read_unlock_bh(&ifp->idev->lock); 4335 4336 /* While dad is in progress mld report's source address is in6_addrany. 4337 * Resend with proper ll now. 4338 */ 4339 if (send_mld) 4340 ipv6_mc_dad_complete(ifp->idev); 4341 4342 /* send unsolicited NA if enabled */ 4343 if (send_na && 4344 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4345 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4346 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4347 /*router=*/ !!ifp->idev->cnf.forwarding, 4348 /*solicited=*/ false, /*override=*/ true, 4349 /*inc_opt=*/ true); 4350 } 4351 4352 if (send_rs) { 4353 /* 4354 * If a host as already performed a random delay 4355 * [...] as part of DAD [...] there is no need 4356 * to delay again before sending the first RS 4357 */ 4358 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4359 return; 4360 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4361 4362 write_lock_bh(&ifp->idev->lock); 4363 spin_lock(&ifp->lock); 4364 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4365 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4366 ifp->idev->rs_probes = 1; 4367 ifp->idev->if_flags |= IF_RS_SENT; 4368 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4369 spin_unlock(&ifp->lock); 4370 write_unlock_bh(&ifp->idev->lock); 4371 } 4372 4373 if (bump_id) 4374 rt_genid_bump_ipv6(dev_net(dev)); 4375 4376 /* Make sure that a new temporary address will be created 4377 * before this temporary address becomes deprecated. 4378 */ 4379 if (ifp->flags & IFA_F_TEMPORARY) 4380 addrconf_verify_rtnl(dev_net(dev)); 4381} 4382 4383static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4384{ 4385 struct inet6_ifaddr *ifp; 4386 4387 read_lock_bh(&idev->lock); 4388 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4389 spin_lock(&ifp->lock); 4390 if ((ifp->flags & IFA_F_TENTATIVE && 4391 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4392 if (restart) 4393 ifp->state = INET6_IFADDR_STATE_PREDAD; 4394 addrconf_dad_kick(ifp); 4395 } 4396 spin_unlock(&ifp->lock); 4397 } 4398 read_unlock_bh(&idev->lock); 4399} 4400 4401#ifdef CONFIG_PROC_FS 4402struct if6_iter_state { 4403 struct seq_net_private p; 4404 int bucket; 4405 int offset; 4406}; 4407 4408static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4409{ 4410 struct if6_iter_state *state = seq->private; 4411 struct net *net = seq_file_net(seq); 4412 struct inet6_ifaddr *ifa = NULL; 4413 int p = 0; 4414 4415 /* initial bucket if pos is 0 */ 4416 if (pos == 0) { 4417 state->bucket = 0; 4418 state->offset = 0; 4419 } 4420 4421 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4422 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4423 addr_lst) { 4424 /* sync with offset */ 4425 if (p < state->offset) { 4426 p++; 4427 continue; 4428 } 4429 return ifa; 4430 } 4431 4432 /* prepare for next bucket */ 4433 state->offset = 0; 4434 p = 0; 4435 } 4436 return NULL; 4437} 4438 4439static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4440 struct inet6_ifaddr *ifa) 4441{ 4442 struct if6_iter_state *state = seq->private; 4443 struct net *net = seq_file_net(seq); 4444 4445 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4446 state->offset++; 4447 return ifa; 4448 } 4449 4450 state->offset = 0; 4451 while (++state->bucket < IN6_ADDR_HSIZE) { 4452 hlist_for_each_entry_rcu(ifa, 4453 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4454 return ifa; 4455 } 4456 } 4457 4458 return NULL; 4459} 4460 4461static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4462 __acquires(rcu) 4463{ 4464 rcu_read_lock(); 4465 return if6_get_first(seq, *pos); 4466} 4467 4468static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4469{ 4470 struct inet6_ifaddr *ifa; 4471 4472 ifa = if6_get_next(seq, v); 4473 ++*pos; 4474 return ifa; 4475} 4476 4477static void if6_seq_stop(struct seq_file *seq, void *v) 4478 __releases(rcu) 4479{ 4480 rcu_read_unlock(); 4481} 4482 4483static int if6_seq_show(struct seq_file *seq, void *v) 4484{ 4485 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4486 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4487 &ifp->addr, 4488 ifp->idev->dev->ifindex, 4489 ifp->prefix_len, 4490 ifp->scope, 4491 (u8) ifp->flags, 4492 ifp->idev->dev->name); 4493 return 0; 4494} 4495 4496static const struct seq_operations if6_seq_ops = { 4497 .start = if6_seq_start, 4498 .next = if6_seq_next, 4499 .show = if6_seq_show, 4500 .stop = if6_seq_stop, 4501}; 4502 4503static int __net_init if6_proc_net_init(struct net *net) 4504{ 4505 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4506 sizeof(struct if6_iter_state))) 4507 return -ENOMEM; 4508 return 0; 4509} 4510 4511static void __net_exit if6_proc_net_exit(struct net *net) 4512{ 4513 remove_proc_entry("if_inet6", net->proc_net); 4514} 4515 4516static struct pernet_operations if6_proc_net_ops = { 4517 .init = if6_proc_net_init, 4518 .exit = if6_proc_net_exit, 4519}; 4520 4521int __init if6_proc_init(void) 4522{ 4523 return register_pernet_subsys(&if6_proc_net_ops); 4524} 4525 4526void if6_proc_exit(void) 4527{ 4528 unregister_pernet_subsys(&if6_proc_net_ops); 4529} 4530#endif /* CONFIG_PROC_FS */ 4531 4532#if IS_ENABLED(CONFIG_IPV6_MIP6) 4533/* Check if address is a home address configured on any interface. */ 4534int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4535{ 4536 unsigned int hash = inet6_addr_hash(net, addr); 4537 struct inet6_ifaddr *ifp = NULL; 4538 int ret = 0; 4539 4540 rcu_read_lock(); 4541 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4542 if (ipv6_addr_equal(&ifp->addr, addr) && 4543 (ifp->flags & IFA_F_HOMEADDRESS)) { 4544 ret = 1; 4545 break; 4546 } 4547 } 4548 rcu_read_unlock(); 4549 return ret; 4550} 4551#endif 4552 4553/* RFC6554 has some algorithm to avoid loops in segment routing by 4554 * checking if the segments contains any of a local interface address. 4555 * 4556 * Quote: 4557 * 4558 * To detect loops in the SRH, a router MUST determine if the SRH 4559 * includes multiple addresses assigned to any interface on that router. 4560 * If such addresses appear more than once and are separated by at least 4561 * one address not assigned to that router. 4562 */ 4563int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4564 unsigned char nsegs) 4565{ 4566 const struct in6_addr *addr; 4567 int i, ret = 0, found = 0; 4568 struct inet6_ifaddr *ifp; 4569 bool separated = false; 4570 unsigned int hash; 4571 bool hash_found; 4572 4573 rcu_read_lock(); 4574 for (i = 0; i < nsegs; i++) { 4575 addr = &segs[i]; 4576 hash = inet6_addr_hash(net, addr); 4577 4578 hash_found = false; 4579 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4580 4581 if (ipv6_addr_equal(&ifp->addr, addr)) { 4582 hash_found = true; 4583 break; 4584 } 4585 } 4586 4587 if (hash_found) { 4588 if (found > 1 && separated) { 4589 ret = 1; 4590 break; 4591 } 4592 4593 separated = false; 4594 found++; 4595 } else { 4596 separated = true; 4597 } 4598 } 4599 rcu_read_unlock(); 4600 4601 return ret; 4602} 4603 4604/* 4605 * Periodic address status verification 4606 */ 4607 4608static void addrconf_verify_rtnl(struct net *net) 4609{ 4610 unsigned long now, next, next_sec, next_sched; 4611 struct inet6_ifaddr *ifp; 4612 int i; 4613 4614 ASSERT_RTNL(); 4615 4616 rcu_read_lock_bh(); 4617 now = jiffies; 4618 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4619 4620 cancel_delayed_work(&net->ipv6.addr_chk_work); 4621 4622 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4623restart: 4624 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4625 unsigned long age; 4626 4627 /* When setting preferred_lft to a value not zero or 4628 * infinity, while valid_lft is infinity 4629 * IFA_F_PERMANENT has a non-infinity life time. 4630 */ 4631 if ((ifp->flags & IFA_F_PERMANENT) && 4632 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4633 continue; 4634 4635 spin_lock(&ifp->lock); 4636 /* We try to batch several events at once. */ 4637 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4638 4639 if ((ifp->flags&IFA_F_TEMPORARY) && 4640 !(ifp->flags&IFA_F_TENTATIVE) && 4641 ifp->prefered_lft != INFINITY_LIFE_TIME && 4642 !ifp->regen_count && ifp->ifpub) { 4643 /* This is a non-regenerated temporary addr. */ 4644 4645 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4646 4647 if (age + regen_advance >= ifp->prefered_lft) { 4648 struct inet6_ifaddr *ifpub = ifp->ifpub; 4649 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4650 next = ifp->tstamp + ifp->prefered_lft * HZ; 4651 4652 ifp->regen_count++; 4653 in6_ifa_hold(ifp); 4654 in6_ifa_hold(ifpub); 4655 spin_unlock(&ifp->lock); 4656 4657 spin_lock(&ifpub->lock); 4658 ifpub->regen_count = 0; 4659 spin_unlock(&ifpub->lock); 4660 rcu_read_unlock_bh(); 4661 ipv6_create_tempaddr(ifpub, true); 4662 in6_ifa_put(ifpub); 4663 in6_ifa_put(ifp); 4664 rcu_read_lock_bh(); 4665 goto restart; 4666 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4667 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4668 } 4669 4670 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4671 age >= ifp->valid_lft) { 4672 spin_unlock(&ifp->lock); 4673 in6_ifa_hold(ifp); 4674 rcu_read_unlock_bh(); 4675 ipv6_del_addr(ifp); 4676 rcu_read_lock_bh(); 4677 goto restart; 4678 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4679 spin_unlock(&ifp->lock); 4680 continue; 4681 } else if (age >= ifp->prefered_lft) { 4682 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4683 int deprecate = 0; 4684 4685 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4686 deprecate = 1; 4687 ifp->flags |= IFA_F_DEPRECATED; 4688 } 4689 4690 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4691 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4692 next = ifp->tstamp + ifp->valid_lft * HZ; 4693 4694 spin_unlock(&ifp->lock); 4695 4696 if (deprecate) { 4697 in6_ifa_hold(ifp); 4698 4699 ipv6_ifa_notify(0, ifp); 4700 in6_ifa_put(ifp); 4701 goto restart; 4702 } 4703 } else { 4704 /* ifp->prefered_lft <= ifp->valid_lft */ 4705 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4706 next = ifp->tstamp + ifp->prefered_lft * HZ; 4707 spin_unlock(&ifp->lock); 4708 } 4709 } 4710 } 4711 4712 next_sec = round_jiffies_up(next); 4713 next_sched = next; 4714 4715 /* If rounded timeout is accurate enough, accept it. */ 4716 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4717 next_sched = next_sec; 4718 4719 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4720 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4721 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4722 4723 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4724 now, next, next_sec, next_sched); 4725 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4726 rcu_read_unlock_bh(); 4727} 4728 4729static void addrconf_verify_work(struct work_struct *w) 4730{ 4731 struct net *net = container_of(to_delayed_work(w), struct net, 4732 ipv6.addr_chk_work); 4733 4734 rtnl_net_lock(net); 4735 addrconf_verify_rtnl(net); 4736 rtnl_net_unlock(net); 4737} 4738 4739static void addrconf_verify(struct net *net) 4740{ 4741 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4742} 4743 4744static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4745 struct in6_addr **peer_pfx) 4746{ 4747 struct in6_addr *pfx = NULL; 4748 4749 *peer_pfx = NULL; 4750 4751 if (addr) 4752 pfx = nla_data(addr); 4753 4754 if (local) { 4755 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4756 *peer_pfx = pfx; 4757 pfx = nla_data(local); 4758 } 4759 4760 return pfx; 4761} 4762 4763static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4764 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4765 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4766 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4767 [IFA_FLAGS] = { .len = sizeof(u32) }, 4768 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4769 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4770 [IFA_PROTO] = { .type = NLA_U8 }, 4771}; 4772 4773static int 4774inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4775 struct netlink_ext_ack *extack) 4776{ 4777 struct net *net = sock_net(skb->sk); 4778 struct ifaddrmsg *ifm; 4779 struct nlattr *tb[IFA_MAX+1]; 4780 struct in6_addr *pfx, *peer_pfx; 4781 u32 ifa_flags; 4782 int err; 4783 4784 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4785 ifa_ipv6_policy, extack); 4786 if (err < 0) 4787 return err; 4788 4789 ifm = nlmsg_data(nlh); 4790 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4791 if (!pfx) 4792 return -EINVAL; 4793 4794 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 4795 4796 /* We ignore other flags so far. */ 4797 ifa_flags &= IFA_F_MANAGETEMPADDR; 4798 4799 rtnl_net_lock(net); 4800 err = inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4801 ifm->ifa_prefixlen, extack); 4802 rtnl_net_unlock(net); 4803 4804 return err; 4805} 4806 4807static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp, 4808 unsigned long expires, u32 flags, 4809 bool modify_peer) 4810{ 4811 struct fib6_table *table; 4812 struct fib6_info *f6i; 4813 u32 prio; 4814 4815 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4816 ifp->prefix_len, 4817 ifp->idev->dev, 0, RTF_DEFAULT, true); 4818 if (!f6i) 4819 return -ENOENT; 4820 4821 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4822 if (f6i->fib6_metric != prio) { 4823 /* delete old one */ 4824 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4825 4826 /* add new one */ 4827 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4828 ifp->prefix_len, 4829 ifp->rt_priority, ifp->idev->dev, 4830 expires, flags, GFP_KERNEL); 4831 return 0; 4832 } 4833 if (f6i != net->ipv6.fib6_null_entry) { 4834 table = f6i->fib6_table; 4835 spin_lock_bh(&table->tb6_lock); 4836 4837 if (!(flags & RTF_EXPIRES)) { 4838 fib6_clean_expires(f6i); 4839 fib6_may_remove_gc_list(net, f6i); 4840 } else { 4841 fib6_set_expires(f6i, expires); 4842 fib6_add_gc_list(f6i); 4843 } 4844 4845 spin_unlock_bh(&table->tb6_lock); 4846 } 4847 fib6_info_release(f6i); 4848 4849 return 0; 4850} 4851 4852static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4853 struct ifa6_config *cfg, clock_t expires, 4854 u32 flags) 4855{ 4856 bool was_managetempaddr; 4857 bool new_peer = false; 4858 bool had_prefixroute; 4859 4860 ASSERT_RTNL_NET(net); 4861 4862 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4863 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4864 return -EINVAL; 4865 4866 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4867 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4868 4869 if (cfg->peer_pfx && 4870 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4871 if (!ipv6_addr_any(&ifp->peer_addr)) 4872 cleanup_prefix_route(ifp, expires, true, true); 4873 new_peer = true; 4874 } 4875 4876 spin_lock_bh(&ifp->lock); 4877 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4878 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4879 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4880 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4881 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4882 IFA_F_NOPREFIXROUTE); 4883 ifp->flags |= cfg->ifa_flags; 4884 WRITE_ONCE(ifp->tstamp, jiffies); 4885 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4886 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4887 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4888 4889 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4890 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4891 4892 if (new_peer) 4893 ifp->peer_addr = *cfg->peer_pfx; 4894 4895 spin_unlock_bh(&ifp->lock); 4896 if (!(ifp->flags&IFA_F_TENTATIVE)) 4897 ipv6_ifa_notify(0, ifp); 4898 4899 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4900 int rc = -ENOENT; 4901 4902 if (had_prefixroute) 4903 rc = modify_prefix_route(net, ifp, expires, flags, false); 4904 4905 /* prefix route could have been deleted; if so restore it */ 4906 if (rc == -ENOENT) { 4907 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4908 ifp->rt_priority, ifp->idev->dev, 4909 expires, flags, GFP_KERNEL); 4910 } 4911 4912 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4913 rc = modify_prefix_route(net, ifp, expires, flags, true); 4914 4915 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4916 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4917 ifp->rt_priority, ifp->idev->dev, 4918 expires, flags, GFP_KERNEL); 4919 } 4920 } else if (had_prefixroute) { 4921 enum cleanup_prefix_rt_t action; 4922 unsigned long rt_expires; 4923 4924 write_lock_bh(&ifp->idev->lock); 4925 action = check_cleanup_prefix_route(ifp, &rt_expires); 4926 write_unlock_bh(&ifp->idev->lock); 4927 4928 if (action != CLEANUP_PREFIX_RT_NOP) { 4929 cleanup_prefix_route(ifp, rt_expires, 4930 action == CLEANUP_PREFIX_RT_DEL, false); 4931 } 4932 } 4933 4934 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4935 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4936 delete_tempaddrs(ifp->idev, ifp); 4937 else 4938 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4939 cfg->preferred_lft, !was_managetempaddr, 4940 jiffies); 4941 } 4942 4943 addrconf_verify_rtnl(net); 4944 4945 return 0; 4946} 4947 4948static int 4949inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4950 struct netlink_ext_ack *extack) 4951{ 4952 struct net *net = sock_net(skb->sk); 4953 struct nlattr *tb[IFA_MAX+1]; 4954 struct in6_addr *peer_pfx; 4955 struct inet6_ifaddr *ifa; 4956 struct net_device *dev; 4957 struct inet6_dev *idev; 4958 struct ifa6_config cfg; 4959 struct ifaddrmsg *ifm; 4960 unsigned long timeout; 4961 clock_t expires; 4962 u32 flags; 4963 int err; 4964 4965 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4966 ifa_ipv6_policy, extack); 4967 if (err < 0) 4968 return err; 4969 4970 memset(&cfg, 0, sizeof(cfg)); 4971 4972 ifm = nlmsg_data(nlh); 4973 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4974 if (!cfg.pfx) 4975 return -EINVAL; 4976 4977 cfg.peer_pfx = peer_pfx; 4978 cfg.plen = ifm->ifa_prefixlen; 4979 if (tb[IFA_RT_PRIORITY]) 4980 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4981 4982 if (tb[IFA_PROTO]) 4983 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4984 4985 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 4986 4987 /* We ignore other flags so far. */ 4988 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4989 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4990 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4991 4992 cfg.ifa_flags |= IFA_F_PERMANENT; 4993 cfg.valid_lft = INFINITY_LIFE_TIME; 4994 cfg.preferred_lft = INFINITY_LIFE_TIME; 4995 expires = 0; 4996 flags = 0; 4997 4998 if (tb[IFA_CACHEINFO]) { 4999 struct ifa_cacheinfo *ci; 5000 5001 ci = nla_data(tb[IFA_CACHEINFO]); 5002 cfg.valid_lft = ci->ifa_valid; 5003 cfg.preferred_lft = ci->ifa_prefered; 5004 5005 if (!cfg.valid_lft || cfg.preferred_lft > cfg.valid_lft) { 5006 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 5007 return -EINVAL; 5008 } 5009 5010 timeout = addrconf_timeout_fixup(cfg.valid_lft, HZ); 5011 if (addrconf_finite_timeout(timeout)) { 5012 cfg.ifa_flags &= ~IFA_F_PERMANENT; 5013 cfg.valid_lft = timeout; 5014 expires = jiffies_to_clock_t(timeout * HZ); 5015 flags = RTF_EXPIRES; 5016 } 5017 5018 timeout = addrconf_timeout_fixup(cfg.preferred_lft, HZ); 5019 if (addrconf_finite_timeout(timeout)) { 5020 if (timeout == 0) 5021 cfg.ifa_flags |= IFA_F_DEPRECATED; 5022 5023 cfg.preferred_lft = timeout; 5024 } 5025 } 5026 5027 rtnl_net_lock(net); 5028 5029 dev = __dev_get_by_index(net, ifm->ifa_index); 5030 if (!dev) { 5031 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5032 err = -ENODEV; 5033 goto unlock_rtnl; 5034 } 5035 5036 netdev_lock_ops(dev); 5037 idev = ipv6_find_idev(dev); 5038 if (IS_ERR(idev)) { 5039 err = PTR_ERR(idev); 5040 goto unlock; 5041 } 5042 5043 if (!ipv6_allow_optimistic_dad(net, idev)) 5044 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5045 5046 if (cfg.ifa_flags & IFA_F_NODAD && 5047 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5048 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5049 err = -EINVAL; 5050 goto unlock; 5051 } 5052 5053 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5054 if (!ifa) { 5055 /* 5056 * It would be best to check for !NLM_F_CREATE here but 5057 * userspace already relies on not having to provide this. 5058 */ 5059 err = inet6_addr_add(net, dev, &cfg, expires, flags, extack); 5060 goto unlock; 5061 } 5062 5063 if (nlh->nlmsg_flags & NLM_F_EXCL || 5064 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5065 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5066 err = -EEXIST; 5067 } else { 5068 err = inet6_addr_modify(net, ifa, &cfg, expires, flags); 5069 } 5070 5071 in6_ifa_put(ifa); 5072unlock: 5073 netdev_unlock_ops(dev); 5074unlock_rtnl: 5075 rtnl_net_unlock(net); 5076 5077 return err; 5078} 5079 5080static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5081 u8 scope, int ifindex) 5082{ 5083 struct ifaddrmsg *ifm; 5084 5085 ifm = nlmsg_data(nlh); 5086 ifm->ifa_family = AF_INET6; 5087 ifm->ifa_prefixlen = prefixlen; 5088 ifm->ifa_flags = flags; 5089 ifm->ifa_scope = scope; 5090 ifm->ifa_index = ifindex; 5091} 5092 5093static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5094 unsigned long tstamp, u32 preferred, u32 valid) 5095{ 5096 struct ifa_cacheinfo ci; 5097 5098 ci.cstamp = cstamp_delta(cstamp); 5099 ci.tstamp = cstamp_delta(tstamp); 5100 ci.ifa_prefered = preferred; 5101 ci.ifa_valid = valid; 5102 5103 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5104} 5105 5106static inline int rt_scope(int ifa_scope) 5107{ 5108 if (ifa_scope & IFA_HOST) 5109 return RT_SCOPE_HOST; 5110 else if (ifa_scope & IFA_LINK) 5111 return RT_SCOPE_LINK; 5112 else if (ifa_scope & IFA_SITE) 5113 return RT_SCOPE_SITE; 5114 else 5115 return RT_SCOPE_UNIVERSE; 5116} 5117 5118static inline int inet6_ifaddr_msgsize(void) 5119{ 5120 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5121 + nla_total_size(16) /* IFA_LOCAL */ 5122 + nla_total_size(16) /* IFA_ADDRESS */ 5123 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5124 + nla_total_size(4) /* IFA_FLAGS */ 5125 + nla_total_size(1) /* IFA_PROTO */ 5126 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5127} 5128 5129static int inet6_fill_ifaddr(struct sk_buff *skb, 5130 const struct inet6_ifaddr *ifa, 5131 struct inet6_fill_args *args) 5132{ 5133 struct nlmsghdr *nlh; 5134 u32 preferred, valid; 5135 u32 flags, priority; 5136 u8 proto; 5137 5138 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5139 sizeof(struct ifaddrmsg), args->flags); 5140 if (!nlh) 5141 return -EMSGSIZE; 5142 5143 flags = READ_ONCE(ifa->flags); 5144 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5145 ifa->idev->dev->ifindex); 5146 5147 if (args->netnsid >= 0 && 5148 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5149 goto error; 5150 5151 preferred = READ_ONCE(ifa->prefered_lft); 5152 valid = READ_ONCE(ifa->valid_lft); 5153 5154 if (!((flags & IFA_F_PERMANENT) && 5155 (preferred == INFINITY_LIFE_TIME))) { 5156 if (preferred != INFINITY_LIFE_TIME) { 5157 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5158 5159 if (preferred > tval) 5160 preferred -= tval; 5161 else 5162 preferred = 0; 5163 if (valid != INFINITY_LIFE_TIME) { 5164 if (valid > tval) 5165 valid -= tval; 5166 else 5167 valid = 0; 5168 } 5169 } 5170 } else { 5171 preferred = INFINITY_LIFE_TIME; 5172 valid = INFINITY_LIFE_TIME; 5173 } 5174 5175 if (!ipv6_addr_any(&ifa->peer_addr)) { 5176 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5177 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5178 goto error; 5179 } else { 5180 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5181 goto error; 5182 } 5183 5184 priority = READ_ONCE(ifa->rt_priority); 5185 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5186 goto error; 5187 5188 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5189 preferred, valid) < 0) 5190 goto error; 5191 5192 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5193 goto error; 5194 5195 proto = READ_ONCE(ifa->ifa_proto); 5196 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5197 goto error; 5198 5199 nlmsg_end(skb, nlh); 5200 return 0; 5201 5202error: 5203 nlmsg_cancel(skb, nlh); 5204 return -EMSGSIZE; 5205} 5206 5207int inet6_fill_ifmcaddr(struct sk_buff *skb, 5208 const struct ifmcaddr6 *ifmca, 5209 struct inet6_fill_args *args) 5210{ 5211 int ifindex = ifmca->idev->dev->ifindex; 5212 u8 scope = RT_SCOPE_UNIVERSE; 5213 struct nlmsghdr *nlh; 5214 5215 if (!args->force_rt_scope_universe && 5216 ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5217 scope = RT_SCOPE_SITE; 5218 5219 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5220 sizeof(struct ifaddrmsg), args->flags); 5221 if (!nlh) 5222 return -EMSGSIZE; 5223 5224 if (args->netnsid >= 0 && 5225 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5226 nlmsg_cancel(skb, nlh); 5227 return -EMSGSIZE; 5228 } 5229 5230 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5231 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5232 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5233 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5234 nlmsg_cancel(skb, nlh); 5235 return -EMSGSIZE; 5236 } 5237 5238 nlmsg_end(skb, nlh); 5239 return 0; 5240} 5241 5242int inet6_fill_ifacaddr(struct sk_buff *skb, 5243 const struct ifacaddr6 *ifaca, 5244 struct inet6_fill_args *args) 5245{ 5246 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5247 int ifindex = dev ? dev->ifindex : 1; 5248 u8 scope = RT_SCOPE_UNIVERSE; 5249 struct nlmsghdr *nlh; 5250 5251 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5252 scope = RT_SCOPE_SITE; 5253 5254 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5255 sizeof(struct ifaddrmsg), args->flags); 5256 if (!nlh) 5257 return -EMSGSIZE; 5258 5259 if (args->netnsid >= 0 && 5260 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5261 nlmsg_cancel(skb, nlh); 5262 return -EMSGSIZE; 5263 } 5264 5265 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5266 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5267 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5268 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5269 nlmsg_cancel(skb, nlh); 5270 return -EMSGSIZE; 5271 } 5272 5273 nlmsg_end(skb, nlh); 5274 return 0; 5275} 5276 5277/* called with rcu_read_lock() */ 5278static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5279 struct netlink_callback *cb, int *s_ip_idx, 5280 struct inet6_fill_args *fillargs) 5281{ 5282 const struct ifmcaddr6 *ifmca; 5283 const struct ifacaddr6 *ifaca; 5284 int ip_idx = 0; 5285 int err = 0; 5286 5287 switch (fillargs->type) { 5288 case UNICAST_ADDR: { 5289 const struct inet6_ifaddr *ifa; 5290 fillargs->event = RTM_NEWADDR; 5291 5292 /* unicast address incl. temp addr */ 5293 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5294 if (ip_idx < *s_ip_idx) 5295 goto next; 5296 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5297 if (err < 0) 5298 break; 5299 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5300next: 5301 ip_idx++; 5302 } 5303 break; 5304 } 5305 case MULTICAST_ADDR: 5306 fillargs->event = RTM_GETMULTICAST; 5307 5308 /* multicast address */ 5309 for (ifmca = rcu_dereference(idev->mc_list); 5310 ifmca; 5311 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5312 if (ip_idx < *s_ip_idx) 5313 continue; 5314 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5315 if (err < 0) 5316 break; 5317 } 5318 break; 5319 case ANYCAST_ADDR: 5320 fillargs->event = RTM_GETANYCAST; 5321 /* anycast address */ 5322 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5323 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5324 if (ip_idx < *s_ip_idx) 5325 continue; 5326 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5327 if (err < 0) 5328 break; 5329 } 5330 break; 5331 default: 5332 break; 5333 } 5334 *s_ip_idx = err ? ip_idx : 0; 5335 return err; 5336} 5337 5338static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5339 struct inet6_fill_args *fillargs, 5340 struct net **tgt_net, struct sock *sk, 5341 struct netlink_callback *cb) 5342{ 5343 struct netlink_ext_ack *extack = cb->extack; 5344 struct nlattr *tb[IFA_MAX+1]; 5345 struct ifaddrmsg *ifm; 5346 int err, i; 5347 5348 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5349 if (!ifm) { 5350 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5351 return -EINVAL; 5352 } 5353 5354 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5355 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5356 return -EINVAL; 5357 } 5358 5359 fillargs->ifindex = ifm->ifa_index; 5360 if (fillargs->ifindex) { 5361 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5362 fillargs->flags |= NLM_F_DUMP_FILTERED; 5363 } 5364 5365 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5366 ifa_ipv6_policy, extack); 5367 if (err < 0) 5368 return err; 5369 5370 for (i = 0; i <= IFA_MAX; ++i) { 5371 if (!tb[i]) 5372 continue; 5373 5374 if (i == IFA_TARGET_NETNSID) { 5375 struct net *net; 5376 5377 fillargs->netnsid = nla_get_s32(tb[i]); 5378 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5379 if (IS_ERR(net)) { 5380 fillargs->netnsid = -1; 5381 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5382 return PTR_ERR(net); 5383 } 5384 *tgt_net = net; 5385 } else { 5386 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5387 return -EINVAL; 5388 } 5389 } 5390 5391 return 0; 5392} 5393 5394static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5395 enum addr_type_t type) 5396{ 5397 struct net *tgt_net = sock_net(skb->sk); 5398 const struct nlmsghdr *nlh = cb->nlh; 5399 struct inet6_fill_args fillargs = { 5400 .portid = NETLINK_CB(cb->skb).portid, 5401 .seq = cb->nlh->nlmsg_seq, 5402 .flags = NLM_F_MULTI, 5403 .netnsid = -1, 5404 .type = type, 5405 .force_rt_scope_universe = false, 5406 }; 5407 struct { 5408 unsigned long ifindex; 5409 int ip_idx; 5410 } *ctx = (void *)cb->ctx; 5411 struct net_device *dev; 5412 struct inet6_dev *idev; 5413 int err = 0; 5414 5415 rcu_read_lock(); 5416 if (cb->strict_check) { 5417 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5418 skb->sk, cb); 5419 if (err < 0) 5420 goto done; 5421 5422 err = 0; 5423 if (fillargs.ifindex) { 5424 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5425 if (!dev) { 5426 err = -ENODEV; 5427 goto done; 5428 } 5429 idev = __in6_dev_get(dev); 5430 if (idev) 5431 err = in6_dump_addrs(idev, skb, cb, 5432 &ctx->ip_idx, 5433 &fillargs); 5434 goto done; 5435 } 5436 } 5437 5438 cb->seq = inet6_base_seq(tgt_net); 5439 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5440 idev = __in6_dev_get(dev); 5441 if (!idev) 5442 continue; 5443 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5444 &fillargs); 5445 if (err < 0) 5446 goto done; 5447 } 5448done: 5449 rcu_read_unlock(); 5450 if (fillargs.netnsid >= 0) 5451 put_net(tgt_net); 5452 5453 return err; 5454} 5455 5456static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5457{ 5458 enum addr_type_t type = UNICAST_ADDR; 5459 5460 return inet6_dump_addr(skb, cb, type); 5461} 5462 5463static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5464{ 5465 enum addr_type_t type = MULTICAST_ADDR; 5466 5467 return inet6_dump_addr(skb, cb, type); 5468} 5469 5470 5471static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5472{ 5473 enum addr_type_t type = ANYCAST_ADDR; 5474 5475 return inet6_dump_addr(skb, cb, type); 5476} 5477 5478static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5479 const struct nlmsghdr *nlh, 5480 struct nlattr **tb, 5481 struct netlink_ext_ack *extack) 5482{ 5483 struct ifaddrmsg *ifm; 5484 int i, err; 5485 5486 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5487 if (!ifm) { 5488 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5489 return -EINVAL; 5490 } 5491 5492 if (!netlink_strict_get_check(skb)) 5493 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5494 ifa_ipv6_policy, extack); 5495 5496 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5497 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5498 return -EINVAL; 5499 } 5500 5501 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5502 ifa_ipv6_policy, extack); 5503 if (err) 5504 return err; 5505 5506 for (i = 0; i <= IFA_MAX; i++) { 5507 if (!tb[i]) 5508 continue; 5509 5510 switch (i) { 5511 case IFA_TARGET_NETNSID: 5512 case IFA_ADDRESS: 5513 case IFA_LOCAL: 5514 break; 5515 default: 5516 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5517 return -EINVAL; 5518 } 5519 } 5520 5521 return 0; 5522} 5523 5524static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5525 struct netlink_ext_ack *extack) 5526{ 5527 struct net *tgt_net = sock_net(in_skb->sk); 5528 struct inet6_fill_args fillargs = { 5529 .portid = NETLINK_CB(in_skb).portid, 5530 .seq = nlh->nlmsg_seq, 5531 .event = RTM_NEWADDR, 5532 .flags = 0, 5533 .netnsid = -1, 5534 .force_rt_scope_universe = false, 5535 }; 5536 struct ifaddrmsg *ifm; 5537 struct nlattr *tb[IFA_MAX+1]; 5538 struct in6_addr *addr = NULL, *peer; 5539 struct net_device *dev = NULL; 5540 struct inet6_ifaddr *ifa; 5541 struct sk_buff *skb; 5542 int err; 5543 5544 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5545 if (err < 0) 5546 return err; 5547 5548 if (tb[IFA_TARGET_NETNSID]) { 5549 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5550 5551 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5552 fillargs.netnsid); 5553 if (IS_ERR(tgt_net)) 5554 return PTR_ERR(tgt_net); 5555 } 5556 5557 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5558 if (!addr) { 5559 err = -EINVAL; 5560 goto errout; 5561 } 5562 ifm = nlmsg_data(nlh); 5563 if (ifm->ifa_index) 5564 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5565 5566 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5567 if (!ifa) { 5568 err = -EADDRNOTAVAIL; 5569 goto errout; 5570 } 5571 5572 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5573 if (!skb) { 5574 err = -ENOBUFS; 5575 goto errout_ifa; 5576 } 5577 5578 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5579 if (err < 0) { 5580 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5581 WARN_ON(err == -EMSGSIZE); 5582 kfree_skb(skb); 5583 goto errout_ifa; 5584 } 5585 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5586errout_ifa: 5587 in6_ifa_put(ifa); 5588errout: 5589 dev_put(dev); 5590 if (fillargs.netnsid >= 0) 5591 put_net(tgt_net); 5592 5593 return err; 5594} 5595 5596static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5597{ 5598 struct sk_buff *skb; 5599 struct net *net = dev_net(ifa->idev->dev); 5600 struct inet6_fill_args fillargs = { 5601 .portid = 0, 5602 .seq = 0, 5603 .event = event, 5604 .flags = 0, 5605 .netnsid = -1, 5606 .force_rt_scope_universe = false, 5607 }; 5608 int err = -ENOBUFS; 5609 5610 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5611 if (!skb) 5612 goto errout; 5613 5614 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5615 if (err < 0) { 5616 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5617 WARN_ON(err == -EMSGSIZE); 5618 kfree_skb(skb); 5619 goto errout; 5620 } 5621 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5622 return; 5623errout: 5624 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5625} 5626 5627static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5628 __s32 *array, int bytes) 5629{ 5630 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5631 5632 memset(array, 0, bytes); 5633 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5634 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5635 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5636 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5637 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5638 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5639 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5640 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5641 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5642 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5643 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5644 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5645 array[DEVCONF_RTR_SOLICIT_DELAY] = 5646 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5647 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5648 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5649 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5650 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5651 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5652 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5653 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5654 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5655 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5656 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5657 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5658 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5659 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5660 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5661 READ_ONCE(cnf->accept_ra_min_hop_limit); 5662 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5663#ifdef CONFIG_IPV6_ROUTER_PREF 5664 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5665 array[DEVCONF_RTR_PROBE_INTERVAL] = 5666 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5667#ifdef CONFIG_IPV6_ROUTE_INFO 5668 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5669 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5670 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5671 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5672#endif 5673#endif 5674 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5675 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5676 READ_ONCE(cnf->accept_source_route); 5677#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5678 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5679 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5680#endif 5681#ifdef CONFIG_IPV6_MROUTE 5682 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5683#endif 5684 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5685 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5686 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5687 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5688 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5689 READ_ONCE(cnf->suppress_frag_ndisc); 5690 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5691 READ_ONCE(cnf->accept_ra_from_local); 5692 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5693 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5694 READ_ONCE(cnf->ignore_routes_with_linkdown); 5695 /* we omit DEVCONF_STABLE_SECRET for now */ 5696 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5697 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5698 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5699 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5700 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5701 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5702#ifdef CONFIG_IPV6_SEG6_HMAC 5703 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5704#endif 5705 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5706 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5707 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5708 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5709 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5710 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5711 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5712 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5713 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5714 READ_ONCE(cnf->ndisc_evict_nocarrier); 5715 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5716 READ_ONCE(cnf->accept_untracked_na); 5717 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5718 array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding); 5719} 5720 5721static inline size_t inet6_ifla6_size(void) 5722{ 5723 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5724 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5725 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5726 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5727 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5728 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5729 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5730 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5731 + 0; 5732} 5733 5734static inline size_t inet6_if_nlmsg_size(void) 5735{ 5736 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5737 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5738 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5739 + nla_total_size(4) /* IFLA_MTU */ 5740 + nla_total_size(4) /* IFLA_LINK */ 5741 + nla_total_size(1) /* IFLA_OPERSTATE */ 5742 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5743} 5744 5745static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5746 int bytes) 5747{ 5748 int i; 5749 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5750 BUG_ON(pad < 0); 5751 5752 /* Use put_unaligned() because stats may not be aligned for u64. */ 5753 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5754 for (i = 1; i < ICMP6_MIB_MAX; i++) 5755 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5756 5757 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5758} 5759 5760static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5761 int bytes, size_t syncpoff) 5762{ 5763 int i, c; 5764 u64 buff[IPSTATS_MIB_MAX]; 5765 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5766 5767 BUG_ON(pad < 0); 5768 5769 memset(buff, 0, sizeof(buff)); 5770 buff[0] = IPSTATS_MIB_MAX; 5771 5772 for_each_possible_cpu(c) { 5773 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5774 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5775 } 5776 5777 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5778 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5779} 5780 5781static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5782 int bytes) 5783{ 5784 switch (attrtype) { 5785 case IFLA_INET6_STATS: 5786 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5787 offsetof(struct ipstats_mib, syncp)); 5788 break; 5789 case IFLA_INET6_ICMP6STATS: 5790 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5791 break; 5792 } 5793} 5794 5795static int inet6_fill_ifla6_stats_attrs(struct sk_buff *skb, 5796 struct inet6_dev *idev) 5797{ 5798 struct nlattr *nla; 5799 5800 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5801 if (!nla) 5802 goto nla_put_failure; 5803 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5804 5805 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5806 if (!nla) 5807 goto nla_put_failure; 5808 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5809 5810 return 0; 5811 5812nla_put_failure: 5813 return -EMSGSIZE; 5814} 5815 5816static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5817 u32 ext_filter_mask) 5818{ 5819 struct ifla_cacheinfo ci; 5820 struct nlattr *nla; 5821 u32 ra_mtu; 5822 5823 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5824 goto nla_put_failure; 5825 ci.max_reasm_len = IPV6_MAXPLEN; 5826 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5827 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5828 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5829 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5830 goto nla_put_failure; 5831 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5832 if (!nla) 5833 goto nla_put_failure; 5834 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5835 5836 /* XXX - MC not implemented */ 5837 5838 if (!(ext_filter_mask & RTEXT_FILTER_SKIP_STATS)) { 5839 if (inet6_fill_ifla6_stats_attrs(skb, idev) < 0) 5840 goto nla_put_failure; 5841 } 5842 5843 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5844 if (!nla) 5845 goto nla_put_failure; 5846 read_lock_bh(&idev->lock); 5847 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5848 read_unlock_bh(&idev->lock); 5849 5850 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5851 READ_ONCE(idev->cnf.addr_gen_mode))) 5852 goto nla_put_failure; 5853 5854 ra_mtu = READ_ONCE(idev->ra_mtu); 5855 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5856 goto nla_put_failure; 5857 5858 return 0; 5859 5860nla_put_failure: 5861 return -EMSGSIZE; 5862} 5863 5864static size_t inet6_get_link_af_size(const struct net_device *dev, 5865 u32 ext_filter_mask) 5866{ 5867 if (!__in6_dev_get(dev)) 5868 return 0; 5869 5870 return inet6_ifla6_size(); 5871} 5872 5873static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5874 u32 ext_filter_mask) 5875{ 5876 struct inet6_dev *idev = __in6_dev_get(dev); 5877 5878 if (!idev) 5879 return -ENODATA; 5880 5881 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5882 return -EMSGSIZE; 5883 5884 return 0; 5885} 5886 5887static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5888 struct netlink_ext_ack *extack) 5889{ 5890 struct inet6_ifaddr *ifp; 5891 struct net_device *dev = idev->dev; 5892 bool clear_token, update_rs = false; 5893 struct in6_addr ll_addr; 5894 5895 ASSERT_RTNL(); 5896 5897 if (!token) 5898 return -EINVAL; 5899 5900 if (dev->flags & IFF_LOOPBACK) { 5901 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5902 return -EINVAL; 5903 } 5904 5905 if (dev->flags & IFF_NOARP) { 5906 NL_SET_ERR_MSG_MOD(extack, 5907 "Device does not do neighbour discovery"); 5908 return -EINVAL; 5909 } 5910 5911 if (!ipv6_accept_ra(idev)) { 5912 NL_SET_ERR_MSG_MOD(extack, 5913 "Router advertisement is disabled on device"); 5914 return -EINVAL; 5915 } 5916 5917 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5918 NL_SET_ERR_MSG(extack, 5919 "Router solicitation is disabled on device"); 5920 return -EINVAL; 5921 } 5922 5923 write_lock_bh(&idev->lock); 5924 5925 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5926 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5927 5928 write_unlock_bh(&idev->lock); 5929 5930 clear_token = ipv6_addr_any(token); 5931 if (clear_token) 5932 goto update_lft; 5933 5934 if (!idev->dead && (idev->if_flags & IF_READY) && 5935 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5936 IFA_F_OPTIMISTIC)) { 5937 /* If we're not ready, then normal ifup will take care 5938 * of this. Otherwise, we need to request our rs here. 5939 */ 5940 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5941 update_rs = true; 5942 } 5943 5944update_lft: 5945 write_lock_bh(&idev->lock); 5946 5947 if (update_rs) { 5948 idev->if_flags |= IF_RS_SENT; 5949 idev->rs_interval = rfc3315_s14_backoff_init( 5950 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5951 idev->rs_probes = 1; 5952 addrconf_mod_rs_timer(idev, idev->rs_interval); 5953 } 5954 5955 /* Well, that's kinda nasty ... */ 5956 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5957 spin_lock(&ifp->lock); 5958 if (ifp->tokenized) { 5959 ifp->valid_lft = 0; 5960 ifp->prefered_lft = 0; 5961 } 5962 spin_unlock(&ifp->lock); 5963 } 5964 5965 write_unlock_bh(&idev->lock); 5966 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5967 addrconf_verify_rtnl(dev_net(dev)); 5968 return 0; 5969} 5970 5971static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5972 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5973 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5974 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5975 .reject_message = 5976 "IFLA_INET6_RA_MTU can not be set" }, 5977}; 5978 5979static int check_addr_gen_mode(int mode) 5980{ 5981 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5982 mode != IN6_ADDR_GEN_MODE_NONE && 5983 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5984 mode != IN6_ADDR_GEN_MODE_RANDOM) 5985 return -EINVAL; 5986 return 1; 5987} 5988 5989static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5990 int mode) 5991{ 5992 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5993 !idev->cnf.stable_secret.initialized && 5994 !net->ipv6.devconf_dflt->stable_secret.initialized) 5995 return -EINVAL; 5996 return 1; 5997} 5998 5999static int inet6_validate_link_af(const struct net_device *dev, 6000 const struct nlattr *nla, 6001 struct netlink_ext_ack *extack) 6002{ 6003 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6004 struct inet6_dev *idev = NULL; 6005 int err; 6006 6007 if (dev) { 6008 idev = __in6_dev_get(dev); 6009 if (!idev) 6010 return -EAFNOSUPPORT; 6011 } 6012 6013 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 6014 inet6_af_policy, extack); 6015 if (err) 6016 return err; 6017 6018 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6019 return -EINVAL; 6020 6021 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6022 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6023 6024 if (check_addr_gen_mode(mode) < 0) 6025 return -EINVAL; 6026 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6027 return -EINVAL; 6028 } 6029 6030 return 0; 6031} 6032 6033static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6034 struct netlink_ext_ack *extack) 6035{ 6036 struct inet6_dev *idev = __in6_dev_get(dev); 6037 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6038 int err; 6039 6040 if (!idev) 6041 return -EAFNOSUPPORT; 6042 6043 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6044 return -EINVAL; 6045 6046 if (tb[IFLA_INET6_TOKEN]) { 6047 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6048 extack); 6049 if (err) 6050 return err; 6051 } 6052 6053 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6054 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6055 6056 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6057 } 6058 6059 return 0; 6060} 6061 6062static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6063 u32 portid, u32 seq, int event, unsigned int flags) 6064{ 6065 struct net_device *dev = idev->dev; 6066 struct ifinfomsg *hdr; 6067 struct nlmsghdr *nlh; 6068 int ifindex, iflink; 6069 void *protoinfo; 6070 6071 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6072 if (!nlh) 6073 return -EMSGSIZE; 6074 6075 hdr = nlmsg_data(nlh); 6076 hdr->ifi_family = AF_INET6; 6077 hdr->__ifi_pad = 0; 6078 hdr->ifi_type = dev->type; 6079 ifindex = READ_ONCE(dev->ifindex); 6080 hdr->ifi_index = ifindex; 6081 hdr->ifi_flags = netif_get_flags(dev); 6082 hdr->ifi_change = 0; 6083 6084 iflink = dev_get_iflink(dev); 6085 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6086 (dev->addr_len && 6087 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6088 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6089 (ifindex != iflink && 6090 nla_put_u32(skb, IFLA_LINK, iflink)) || 6091 nla_put_u8(skb, IFLA_OPERSTATE, 6092 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6093 goto nla_put_failure; 6094 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6095 if (!protoinfo) 6096 goto nla_put_failure; 6097 6098 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6099 goto nla_put_failure; 6100 6101 nla_nest_end(skb, protoinfo); 6102 nlmsg_end(skb, nlh); 6103 return 0; 6104 6105nla_put_failure: 6106 nlmsg_cancel(skb, nlh); 6107 return -EMSGSIZE; 6108} 6109 6110static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6111 struct netlink_ext_ack *extack) 6112{ 6113 struct ifinfomsg *ifm; 6114 6115 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 6116 if (!ifm) { 6117 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6118 return -EINVAL; 6119 } 6120 6121 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6122 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6123 return -EINVAL; 6124 } 6125 6126 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6127 ifm->ifi_change || ifm->ifi_index) { 6128 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6129 return -EINVAL; 6130 } 6131 6132 return 0; 6133} 6134 6135static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6136{ 6137 struct net *net = sock_net(skb->sk); 6138 struct { 6139 unsigned long ifindex; 6140 } *ctx = (void *)cb->ctx; 6141 struct net_device *dev; 6142 struct inet6_dev *idev; 6143 int err; 6144 6145 /* only requests using strict checking can pass data to 6146 * influence the dump 6147 */ 6148 if (cb->strict_check) { 6149 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6150 6151 if (err < 0) 6152 return err; 6153 } 6154 6155 err = 0; 6156 rcu_read_lock(); 6157 for_each_netdev_dump(net, dev, ctx->ifindex) { 6158 idev = __in6_dev_get(dev); 6159 if (!idev) 6160 continue; 6161 err = inet6_fill_ifinfo(skb, idev, 6162 NETLINK_CB(cb->skb).portid, 6163 cb->nlh->nlmsg_seq, 6164 RTM_NEWLINK, NLM_F_MULTI); 6165 if (err < 0) 6166 break; 6167 } 6168 rcu_read_unlock(); 6169 6170 return err; 6171} 6172 6173void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6174{ 6175 struct sk_buff *skb; 6176 struct net *net = dev_net(idev->dev); 6177 int err = -ENOBUFS; 6178 6179 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6180 if (!skb) 6181 goto errout; 6182 6183 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6184 if (err < 0) { 6185 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6186 WARN_ON(err == -EMSGSIZE); 6187 kfree_skb(skb); 6188 goto errout; 6189 } 6190 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6191 return; 6192errout: 6193 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6194} 6195 6196static inline size_t inet6_prefix_nlmsg_size(void) 6197{ 6198 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6199 + nla_total_size(sizeof(struct in6_addr)) 6200 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6201} 6202 6203static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6204 struct prefix_info *pinfo, u32 portid, u32 seq, 6205 int event, unsigned int flags) 6206{ 6207 struct prefixmsg *pmsg; 6208 struct nlmsghdr *nlh; 6209 struct prefix_cacheinfo ci; 6210 6211 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6212 if (!nlh) 6213 return -EMSGSIZE; 6214 6215 pmsg = nlmsg_data(nlh); 6216 pmsg->prefix_family = AF_INET6; 6217 pmsg->prefix_pad1 = 0; 6218 pmsg->prefix_pad2 = 0; 6219 pmsg->prefix_ifindex = idev->dev->ifindex; 6220 pmsg->prefix_len = pinfo->prefix_len; 6221 pmsg->prefix_type = pinfo->type; 6222 pmsg->prefix_pad3 = 0; 6223 pmsg->prefix_flags = pinfo->flags; 6224 6225 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6226 goto nla_put_failure; 6227 ci.preferred_time = ntohl(pinfo->prefered); 6228 ci.valid_time = ntohl(pinfo->valid); 6229 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6230 goto nla_put_failure; 6231 nlmsg_end(skb, nlh); 6232 return 0; 6233 6234nla_put_failure: 6235 nlmsg_cancel(skb, nlh); 6236 return -EMSGSIZE; 6237} 6238 6239static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6240 struct prefix_info *pinfo) 6241{ 6242 struct sk_buff *skb; 6243 struct net *net = dev_net(idev->dev); 6244 int err = -ENOBUFS; 6245 6246 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6247 if (!skb) 6248 goto errout; 6249 6250 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6251 if (err < 0) { 6252 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6253 WARN_ON(err == -EMSGSIZE); 6254 kfree_skb(skb); 6255 goto errout; 6256 } 6257 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6258 return; 6259errout: 6260 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6261} 6262 6263static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6264{ 6265 struct net *net = dev_net(ifp->idev->dev); 6266 6267 if (event) 6268 ASSERT_RTNL(); 6269 6270 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6271 6272 switch (event) { 6273 case RTM_NEWADDR: 6274 /* 6275 * If the address was optimistic we inserted the route at the 6276 * start of our DAD process, so we don't need to do it again. 6277 * If the device was taken down in the middle of the DAD 6278 * cycle there is a race where we could get here without a 6279 * host route, so nothing to insert. That will be fixed when 6280 * the device is brought up. 6281 */ 6282 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6283 ip6_ins_rt(net, ifp->rt); 6284 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6285 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6286 &ifp->addr, ifp->idev->dev->name); 6287 } 6288 6289 if (ifp->idev->cnf.forwarding) 6290 addrconf_join_anycast(ifp); 6291 if (!ipv6_addr_any(&ifp->peer_addr)) 6292 addrconf_prefix_route(&ifp->peer_addr, 128, 6293 ifp->rt_priority, ifp->idev->dev, 6294 0, 0, GFP_ATOMIC); 6295 break; 6296 case RTM_DELADDR: 6297 if (ifp->idev->cnf.forwarding) 6298 addrconf_leave_anycast(ifp); 6299 addrconf_leave_solict(ifp->idev, &ifp->addr); 6300 if (!ipv6_addr_any(&ifp->peer_addr)) { 6301 struct fib6_info *rt; 6302 6303 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6304 ifp->idev->dev, 0, 0, 6305 false); 6306 if (rt) 6307 ip6_del_rt(net, rt, false); 6308 } 6309 if (ifp->rt) { 6310 ip6_del_rt(net, ifp->rt, false); 6311 ifp->rt = NULL; 6312 } 6313 rt_genid_bump_ipv6(net); 6314 break; 6315 } 6316 atomic_inc(&net->ipv6.dev_addr_genid); 6317} 6318 6319static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6320{ 6321 if (likely(ifp->idev->dead == 0)) 6322 __ipv6_ifa_notify(event, ifp); 6323} 6324 6325#ifdef CONFIG_SYSCTL 6326 6327static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write, 6328 void *buffer, size_t *lenp, loff_t *ppos) 6329{ 6330 int *valp = ctl->data; 6331 int val = *valp; 6332 loff_t pos = *ppos; 6333 struct ctl_table lctl; 6334 int ret; 6335 6336 /* 6337 * ctl->data points to idev->cnf.forwarding, we should 6338 * not modify it until we get the rtnl lock. 6339 */ 6340 lctl = *ctl; 6341 lctl.data = &val; 6342 6343 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6344 6345 if (write) 6346 ret = addrconf_fixup_forwarding(ctl, valp, val); 6347 if (ret) 6348 *ppos = pos; 6349 return ret; 6350} 6351 6352static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write, 6353 void *buffer, size_t *lenp, loff_t *ppos) 6354{ 6355 struct inet6_dev *idev = ctl->extra1; 6356 int min_mtu = IPV6_MIN_MTU; 6357 struct ctl_table lctl; 6358 6359 lctl = *ctl; 6360 lctl.extra1 = &min_mtu; 6361 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6362 6363 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6364} 6365 6366static void dev_disable_change(struct inet6_dev *idev) 6367{ 6368 struct netdev_notifier_info info; 6369 6370 if (!idev || !idev->dev) 6371 return; 6372 6373 netdev_notifier_info_init(&info, idev->dev); 6374 if (idev->cnf.disable_ipv6) 6375 addrconf_notify(NULL, NETDEV_DOWN, &info); 6376 else 6377 addrconf_notify(NULL, NETDEV_UP, &info); 6378} 6379 6380static void addrconf_disable_change(struct net *net, __s32 newf) 6381{ 6382 struct net_device *dev; 6383 struct inet6_dev *idev; 6384 6385 for_each_netdev(net, dev) { 6386 idev = __in6_dev_get_rtnl_net(dev); 6387 if (idev) { 6388 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6389 6390 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6391 if (changed) 6392 dev_disable_change(idev); 6393 } 6394 } 6395} 6396 6397static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf) 6398{ 6399 struct net *net = (struct net *)table->extra2; 6400 int old; 6401 6402 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6403 WRITE_ONCE(*p, newf); 6404 return 0; 6405 } 6406 6407 if (!rtnl_net_trylock(net)) 6408 return restart_syscall(); 6409 6410 old = *p; 6411 WRITE_ONCE(*p, newf); 6412 6413 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6414 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6415 addrconf_disable_change(net, newf); 6416 } else if ((!newf) ^ (!old)) { 6417 dev_disable_change((struct inet6_dev *)table->extra1); 6418 } 6419 6420 rtnl_net_unlock(net); 6421 return 0; 6422} 6423 6424static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write, 6425 void *buffer, size_t *lenp, loff_t *ppos) 6426{ 6427 int *valp = ctl->data; 6428 int val = *valp; 6429 loff_t pos = *ppos; 6430 struct ctl_table lctl; 6431 int ret; 6432 6433 /* 6434 * ctl->data points to idev->cnf.disable_ipv6, we should 6435 * not modify it until we get the rtnl lock. 6436 */ 6437 lctl = *ctl; 6438 lctl.data = &val; 6439 6440 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6441 6442 if (write) 6443 ret = addrconf_disable_ipv6(ctl, valp, val); 6444 if (ret) 6445 *ppos = pos; 6446 return ret; 6447} 6448 6449static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write, 6450 void *buffer, size_t *lenp, loff_t *ppos) 6451{ 6452 int *valp = ctl->data; 6453 int ret; 6454 int old, new; 6455 6456 old = *valp; 6457 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6458 new = *valp; 6459 6460 if (write && old != new) { 6461 struct net *net = ctl->extra2; 6462 6463 if (!rtnl_net_trylock(net)) 6464 return restart_syscall(); 6465 6466 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) { 6467 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6468 NETCONFA_PROXY_NEIGH, 6469 NETCONFA_IFINDEX_DEFAULT, 6470 net->ipv6.devconf_dflt); 6471 } else if (valp == &net->ipv6.devconf_all->proxy_ndp) { 6472 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6473 NETCONFA_PROXY_NEIGH, 6474 NETCONFA_IFINDEX_ALL, 6475 net->ipv6.devconf_all); 6476 } else { 6477 struct inet6_dev *idev = ctl->extra1; 6478 6479 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6480 NETCONFA_PROXY_NEIGH, 6481 idev->dev->ifindex, 6482 &idev->cnf); 6483 } 6484 rtnl_net_unlock(net); 6485 } 6486 6487 return ret; 6488} 6489 6490static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write, 6491 void *buffer, size_t *lenp, 6492 loff_t *ppos) 6493{ 6494 int ret = 0; 6495 u32 new_val; 6496 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6497 struct net *net = (struct net *)ctl->extra2; 6498 struct ctl_table tmp = { 6499 .data = &new_val, 6500 .maxlen = sizeof(new_val), 6501 .mode = ctl->mode, 6502 }; 6503 6504 if (!rtnl_net_trylock(net)) 6505 return restart_syscall(); 6506 6507 new_val = *((u32 *)ctl->data); 6508 6509 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6510 if (ret != 0) 6511 goto out; 6512 6513 if (write) { 6514 if (check_addr_gen_mode(new_val) < 0) { 6515 ret = -EINVAL; 6516 goto out; 6517 } 6518 6519 if (idev) { 6520 if (check_stable_privacy(idev, net, new_val) < 0) { 6521 ret = -EINVAL; 6522 goto out; 6523 } 6524 6525 if (idev->cnf.addr_gen_mode != new_val) { 6526 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6527 netdev_lock_ops(idev->dev); 6528 addrconf_init_auto_addrs(idev->dev); 6529 netdev_unlock_ops(idev->dev); 6530 } 6531 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6532 struct net_device *dev; 6533 6534 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6535 for_each_netdev(net, dev) { 6536 idev = __in6_dev_get_rtnl_net(dev); 6537 if (idev && 6538 idev->cnf.addr_gen_mode != new_val) { 6539 WRITE_ONCE(idev->cnf.addr_gen_mode, 6540 new_val); 6541 netdev_lock_ops(idev->dev); 6542 addrconf_init_auto_addrs(idev->dev); 6543 netdev_unlock_ops(idev->dev); 6544 } 6545 } 6546 } 6547 6548 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6549 } 6550 6551out: 6552 rtnl_net_unlock(net); 6553 6554 return ret; 6555} 6556 6557static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write, 6558 void *buffer, size_t *lenp, 6559 loff_t *ppos) 6560{ 6561 int err; 6562 struct in6_addr addr; 6563 char str[IPV6_MAX_STRLEN]; 6564 struct ctl_table lctl = *ctl; 6565 struct net *net = ctl->extra2; 6566 struct ipv6_stable_secret *secret = ctl->data; 6567 6568 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6569 return -EIO; 6570 6571 lctl.maxlen = IPV6_MAX_STRLEN; 6572 lctl.data = str; 6573 6574 if (!rtnl_net_trylock(net)) 6575 return restart_syscall(); 6576 6577 if (!write && !secret->initialized) { 6578 err = -EIO; 6579 goto out; 6580 } 6581 6582 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6583 if (err >= sizeof(str)) { 6584 err = -EIO; 6585 goto out; 6586 } 6587 6588 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6589 if (err || !write) 6590 goto out; 6591 6592 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6593 err = -EIO; 6594 goto out; 6595 } 6596 6597 secret->initialized = true; 6598 secret->secret = addr; 6599 6600 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6601 struct net_device *dev; 6602 6603 for_each_netdev(net, dev) { 6604 struct inet6_dev *idev = __in6_dev_get_rtnl_net(dev); 6605 6606 if (idev) { 6607 WRITE_ONCE(idev->cnf.addr_gen_mode, 6608 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6609 } 6610 } 6611 } else { 6612 struct inet6_dev *idev = ctl->extra1; 6613 6614 WRITE_ONCE(idev->cnf.addr_gen_mode, 6615 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6616 } 6617 6618out: 6619 rtnl_net_unlock(net); 6620 6621 return err; 6622} 6623 6624static 6625int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl, 6626 int write, void *buffer, 6627 size_t *lenp, 6628 loff_t *ppos) 6629{ 6630 int *valp = ctl->data; 6631 int val = *valp; 6632 loff_t pos = *ppos; 6633 struct ctl_table lctl; 6634 int ret; 6635 6636 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6637 * we should not modify it until we get the rtnl lock. 6638 */ 6639 lctl = *ctl; 6640 lctl.data = &val; 6641 6642 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6643 6644 if (write) 6645 ret = addrconf_fixup_linkdown(ctl, valp, val); 6646 if (ret) 6647 *ppos = pos; 6648 return ret; 6649} 6650 6651static 6652void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6653{ 6654 if (rt) { 6655 if (action) 6656 rt->dst.flags |= DST_NOPOLICY; 6657 else 6658 rt->dst.flags &= ~DST_NOPOLICY; 6659 } 6660} 6661 6662static 6663void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6664{ 6665 struct inet6_ifaddr *ifa; 6666 6667 read_lock_bh(&idev->lock); 6668 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6669 spin_lock(&ifa->lock); 6670 if (ifa->rt) { 6671 /* host routes only use builtin fib6_nh */ 6672 struct fib6_nh *nh = ifa->rt->fib6_nh; 6673 int cpu; 6674 6675 rcu_read_lock(); 6676 ifa->rt->dst_nopolicy = val ? true : false; 6677 if (nh->rt6i_pcpu) { 6678 for_each_possible_cpu(cpu) { 6679 struct rt6_info **rtp; 6680 6681 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6682 addrconf_set_nopolicy(*rtp, val); 6683 } 6684 } 6685 rcu_read_unlock(); 6686 } 6687 spin_unlock(&ifa->lock); 6688 } 6689 read_unlock_bh(&idev->lock); 6690} 6691 6692static 6693int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val) 6694{ 6695 struct net *net = (struct net *)ctl->extra2; 6696 struct inet6_dev *idev; 6697 6698 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6699 WRITE_ONCE(*valp, val); 6700 return 0; 6701 } 6702 6703 if (!rtnl_net_trylock(net)) 6704 return restart_syscall(); 6705 6706 WRITE_ONCE(*valp, val); 6707 6708 if (valp == &net->ipv6.devconf_all->disable_policy) { 6709 struct net_device *dev; 6710 6711 for_each_netdev(net, dev) { 6712 idev = __in6_dev_get_rtnl_net(dev); 6713 if (idev) 6714 addrconf_disable_policy_idev(idev, val); 6715 } 6716 } else { 6717 idev = (struct inet6_dev *)ctl->extra1; 6718 addrconf_disable_policy_idev(idev, val); 6719 } 6720 6721 rtnl_net_unlock(net); 6722 return 0; 6723} 6724 6725static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write, 6726 void *buffer, size_t *lenp, loff_t *ppos) 6727{ 6728 int *valp = ctl->data; 6729 int val = *valp; 6730 loff_t pos = *ppos; 6731 struct ctl_table lctl; 6732 int ret; 6733 6734 lctl = *ctl; 6735 lctl.data = &val; 6736 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6737 6738 if (write && (*valp != val)) 6739 ret = addrconf_disable_policy(ctl, valp, val); 6740 6741 if (ret) 6742 *ppos = pos; 6743 6744 return ret; 6745} 6746 6747static void addrconf_force_forward_change(struct net *net, __s32 newf) 6748{ 6749 struct net_device *dev; 6750 struct inet6_dev *idev; 6751 6752 for_each_netdev(net, dev) { 6753 idev = __in6_dev_get_rtnl_net(dev); 6754 if (idev) { 6755 int changed = (!idev->cnf.force_forwarding) ^ (!newf); 6756 6757 WRITE_ONCE(idev->cnf.force_forwarding, newf); 6758 if (changed) 6759 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 6760 NETCONFA_FORCE_FORWARDING, 6761 dev->ifindex, &idev->cnf); 6762 } 6763 } 6764} 6765 6766static int addrconf_sysctl_force_forwarding(const struct ctl_table *ctl, int write, 6767 void *buffer, size_t *lenp, loff_t *ppos) 6768{ 6769 struct inet6_dev *idev = ctl->extra1; 6770 struct ctl_table tmp_ctl = *ctl; 6771 struct net *net = ctl->extra2; 6772 int *valp = ctl->data; 6773 int new_val = *valp; 6774 int old_val = *valp; 6775 loff_t pos = *ppos; 6776 int ret; 6777 6778 tmp_ctl.extra1 = SYSCTL_ZERO; 6779 tmp_ctl.extra2 = SYSCTL_ONE; 6780 tmp_ctl.data = &new_val; 6781 6782 ret = proc_douintvec_minmax(&tmp_ctl, write, buffer, lenp, ppos); 6783 6784 if (write && old_val != new_val) { 6785 if (!rtnl_net_trylock(net)) 6786 return restart_syscall(); 6787 6788 WRITE_ONCE(*valp, new_val); 6789 6790 if (valp == &net->ipv6.devconf_dflt->force_forwarding) { 6791 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6792 NETCONFA_FORCE_FORWARDING, 6793 NETCONFA_IFINDEX_DEFAULT, 6794 net->ipv6.devconf_dflt); 6795 } else if (valp == &net->ipv6.devconf_all->force_forwarding) { 6796 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6797 NETCONFA_FORCE_FORWARDING, 6798 NETCONFA_IFINDEX_ALL, 6799 net->ipv6.devconf_all); 6800 6801 addrconf_force_forward_change(net, new_val); 6802 } else { 6803 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6804 NETCONFA_FORCE_FORWARDING, 6805 idev->dev->ifindex, 6806 &idev->cnf); 6807 } 6808 rtnl_net_unlock(net); 6809 } 6810 6811 if (ret) 6812 *ppos = pos; 6813 return ret; 6814} 6815 6816static int minus_one = -1; 6817static const int two_five_five = 255; 6818static u32 ioam6_if_id_max = U16_MAX; 6819 6820static const struct ctl_table addrconf_sysctl[] = { 6821 { 6822 .procname = "forwarding", 6823 .data = &ipv6_devconf.forwarding, 6824 .maxlen = sizeof(int), 6825 .mode = 0644, 6826 .proc_handler = addrconf_sysctl_forward, 6827 }, 6828 { 6829 .procname = "hop_limit", 6830 .data = &ipv6_devconf.hop_limit, 6831 .maxlen = sizeof(int), 6832 .mode = 0644, 6833 .proc_handler = proc_dointvec_minmax, 6834 .extra1 = (void *)SYSCTL_ONE, 6835 .extra2 = (void *)&two_five_five, 6836 }, 6837 { 6838 .procname = "mtu", 6839 .data = &ipv6_devconf.mtu6, 6840 .maxlen = sizeof(int), 6841 .mode = 0644, 6842 .proc_handler = addrconf_sysctl_mtu, 6843 }, 6844 { 6845 .procname = "accept_ra", 6846 .data = &ipv6_devconf.accept_ra, 6847 .maxlen = sizeof(int), 6848 .mode = 0644, 6849 .proc_handler = proc_dointvec, 6850 }, 6851 { 6852 .procname = "accept_redirects", 6853 .data = &ipv6_devconf.accept_redirects, 6854 .maxlen = sizeof(int), 6855 .mode = 0644, 6856 .proc_handler = proc_dointvec, 6857 }, 6858 { 6859 .procname = "autoconf", 6860 .data = &ipv6_devconf.autoconf, 6861 .maxlen = sizeof(int), 6862 .mode = 0644, 6863 .proc_handler = proc_dointvec, 6864 }, 6865 { 6866 .procname = "dad_transmits", 6867 .data = &ipv6_devconf.dad_transmits, 6868 .maxlen = sizeof(int), 6869 .mode = 0644, 6870 .proc_handler = proc_dointvec, 6871 }, 6872 { 6873 .procname = "router_solicitations", 6874 .data = &ipv6_devconf.rtr_solicits, 6875 .maxlen = sizeof(int), 6876 .mode = 0644, 6877 .proc_handler = proc_dointvec_minmax, 6878 .extra1 = &minus_one, 6879 }, 6880 { 6881 .procname = "router_solicitation_interval", 6882 .data = &ipv6_devconf.rtr_solicit_interval, 6883 .maxlen = sizeof(int), 6884 .mode = 0644, 6885 .proc_handler = proc_dointvec_jiffies, 6886 }, 6887 { 6888 .procname = "router_solicitation_max_interval", 6889 .data = &ipv6_devconf.rtr_solicit_max_interval, 6890 .maxlen = sizeof(int), 6891 .mode = 0644, 6892 .proc_handler = proc_dointvec_jiffies, 6893 }, 6894 { 6895 .procname = "router_solicitation_delay", 6896 .data = &ipv6_devconf.rtr_solicit_delay, 6897 .maxlen = sizeof(int), 6898 .mode = 0644, 6899 .proc_handler = proc_dointvec_jiffies, 6900 }, 6901 { 6902 .procname = "force_mld_version", 6903 .data = &ipv6_devconf.force_mld_version, 6904 .maxlen = sizeof(int), 6905 .mode = 0644, 6906 .proc_handler = proc_dointvec, 6907 }, 6908 { 6909 .procname = "mldv1_unsolicited_report_interval", 6910 .data = 6911 &ipv6_devconf.mldv1_unsolicited_report_interval, 6912 .maxlen = sizeof(int), 6913 .mode = 0644, 6914 .proc_handler = proc_dointvec_ms_jiffies, 6915 }, 6916 { 6917 .procname = "mldv2_unsolicited_report_interval", 6918 .data = 6919 &ipv6_devconf.mldv2_unsolicited_report_interval, 6920 .maxlen = sizeof(int), 6921 .mode = 0644, 6922 .proc_handler = proc_dointvec_ms_jiffies, 6923 }, 6924 { 6925 .procname = "use_tempaddr", 6926 .data = &ipv6_devconf.use_tempaddr, 6927 .maxlen = sizeof(int), 6928 .mode = 0644, 6929 .proc_handler = proc_dointvec, 6930 }, 6931 { 6932 .procname = "temp_valid_lft", 6933 .data = &ipv6_devconf.temp_valid_lft, 6934 .maxlen = sizeof(int), 6935 .mode = 0644, 6936 .proc_handler = proc_dointvec, 6937 }, 6938 { 6939 .procname = "temp_prefered_lft", 6940 .data = &ipv6_devconf.temp_prefered_lft, 6941 .maxlen = sizeof(int), 6942 .mode = 0644, 6943 .proc_handler = proc_dointvec, 6944 }, 6945 { 6946 .procname = "regen_min_advance", 6947 .data = &ipv6_devconf.regen_min_advance, 6948 .maxlen = sizeof(int), 6949 .mode = 0644, 6950 .proc_handler = proc_dointvec, 6951 }, 6952 { 6953 .procname = "regen_max_retry", 6954 .data = &ipv6_devconf.regen_max_retry, 6955 .maxlen = sizeof(int), 6956 .mode = 0644, 6957 .proc_handler = proc_dointvec, 6958 }, 6959 { 6960 .procname = "max_desync_factor", 6961 .data = &ipv6_devconf.max_desync_factor, 6962 .maxlen = sizeof(int), 6963 .mode = 0644, 6964 .proc_handler = proc_dointvec, 6965 }, 6966 { 6967 .procname = "max_addresses", 6968 .data = &ipv6_devconf.max_addresses, 6969 .maxlen = sizeof(int), 6970 .mode = 0644, 6971 .proc_handler = proc_dointvec, 6972 }, 6973 { 6974 .procname = "accept_ra_defrtr", 6975 .data = &ipv6_devconf.accept_ra_defrtr, 6976 .maxlen = sizeof(int), 6977 .mode = 0644, 6978 .proc_handler = proc_dointvec, 6979 }, 6980 { 6981 .procname = "ra_defrtr_metric", 6982 .data = &ipv6_devconf.ra_defrtr_metric, 6983 .maxlen = sizeof(u32), 6984 .mode = 0644, 6985 .proc_handler = proc_douintvec_minmax, 6986 .extra1 = (void *)SYSCTL_ONE, 6987 }, 6988 { 6989 .procname = "accept_ra_min_hop_limit", 6990 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6991 .maxlen = sizeof(int), 6992 .mode = 0644, 6993 .proc_handler = proc_dointvec, 6994 }, 6995 { 6996 .procname = "accept_ra_min_lft", 6997 .data = &ipv6_devconf.accept_ra_min_lft, 6998 .maxlen = sizeof(int), 6999 .mode = 0644, 7000 .proc_handler = proc_dointvec, 7001 }, 7002 { 7003 .procname = "accept_ra_pinfo", 7004 .data = &ipv6_devconf.accept_ra_pinfo, 7005 .maxlen = sizeof(int), 7006 .mode = 0644, 7007 .proc_handler = proc_dointvec, 7008 }, 7009 { 7010 .procname = "ra_honor_pio_life", 7011 .data = &ipv6_devconf.ra_honor_pio_life, 7012 .maxlen = sizeof(u8), 7013 .mode = 0644, 7014 .proc_handler = proc_dou8vec_minmax, 7015 .extra1 = SYSCTL_ZERO, 7016 .extra2 = SYSCTL_ONE, 7017 }, 7018 { 7019 .procname = "ra_honor_pio_pflag", 7020 .data = &ipv6_devconf.ra_honor_pio_pflag, 7021 .maxlen = sizeof(u8), 7022 .mode = 0644, 7023 .proc_handler = proc_dou8vec_minmax, 7024 .extra1 = SYSCTL_ZERO, 7025 .extra2 = SYSCTL_ONE, 7026 }, 7027#ifdef CONFIG_IPV6_ROUTER_PREF 7028 { 7029 .procname = "accept_ra_rtr_pref", 7030 .data = &ipv6_devconf.accept_ra_rtr_pref, 7031 .maxlen = sizeof(int), 7032 .mode = 0644, 7033 .proc_handler = proc_dointvec, 7034 }, 7035 { 7036 .procname = "router_probe_interval", 7037 .data = &ipv6_devconf.rtr_probe_interval, 7038 .maxlen = sizeof(int), 7039 .mode = 0644, 7040 .proc_handler = proc_dointvec_jiffies, 7041 }, 7042#ifdef CONFIG_IPV6_ROUTE_INFO 7043 { 7044 .procname = "accept_ra_rt_info_min_plen", 7045 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 7046 .maxlen = sizeof(int), 7047 .mode = 0644, 7048 .proc_handler = proc_dointvec, 7049 }, 7050 { 7051 .procname = "accept_ra_rt_info_max_plen", 7052 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 7053 .maxlen = sizeof(int), 7054 .mode = 0644, 7055 .proc_handler = proc_dointvec, 7056 }, 7057#endif 7058#endif 7059 { 7060 .procname = "proxy_ndp", 7061 .data = &ipv6_devconf.proxy_ndp, 7062 .maxlen = sizeof(int), 7063 .mode = 0644, 7064 .proc_handler = addrconf_sysctl_proxy_ndp, 7065 }, 7066 { 7067 .procname = "accept_source_route", 7068 .data = &ipv6_devconf.accept_source_route, 7069 .maxlen = sizeof(int), 7070 .mode = 0644, 7071 .proc_handler = proc_dointvec, 7072 }, 7073#ifdef CONFIG_IPV6_OPTIMISTIC_DAD 7074 { 7075 .procname = "optimistic_dad", 7076 .data = &ipv6_devconf.optimistic_dad, 7077 .maxlen = sizeof(int), 7078 .mode = 0644, 7079 .proc_handler = proc_dointvec, 7080 }, 7081 { 7082 .procname = "use_optimistic", 7083 .data = &ipv6_devconf.use_optimistic, 7084 .maxlen = sizeof(int), 7085 .mode = 0644, 7086 .proc_handler = proc_dointvec, 7087 }, 7088#endif 7089#ifdef CONFIG_IPV6_MROUTE 7090 { 7091 .procname = "mc_forwarding", 7092 .data = &ipv6_devconf.mc_forwarding, 7093 .maxlen = sizeof(int), 7094 .mode = 0444, 7095 .proc_handler = proc_dointvec, 7096 }, 7097#endif 7098 { 7099 .procname = "disable_ipv6", 7100 .data = &ipv6_devconf.disable_ipv6, 7101 .maxlen = sizeof(int), 7102 .mode = 0644, 7103 .proc_handler = addrconf_sysctl_disable, 7104 }, 7105 { 7106 .procname = "accept_dad", 7107 .data = &ipv6_devconf.accept_dad, 7108 .maxlen = sizeof(int), 7109 .mode = 0644, 7110 .proc_handler = proc_dointvec, 7111 }, 7112 { 7113 .procname = "force_tllao", 7114 .data = &ipv6_devconf.force_tllao, 7115 .maxlen = sizeof(int), 7116 .mode = 0644, 7117 .proc_handler = proc_dointvec 7118 }, 7119 { 7120 .procname = "ndisc_notify", 7121 .data = &ipv6_devconf.ndisc_notify, 7122 .maxlen = sizeof(int), 7123 .mode = 0644, 7124 .proc_handler = proc_dointvec 7125 }, 7126 { 7127 .procname = "suppress_frag_ndisc", 7128 .data = &ipv6_devconf.suppress_frag_ndisc, 7129 .maxlen = sizeof(int), 7130 .mode = 0644, 7131 .proc_handler = proc_dointvec 7132 }, 7133 { 7134 .procname = "accept_ra_from_local", 7135 .data = &ipv6_devconf.accept_ra_from_local, 7136 .maxlen = sizeof(int), 7137 .mode = 0644, 7138 .proc_handler = proc_dointvec, 7139 }, 7140 { 7141 .procname = "accept_ra_mtu", 7142 .data = &ipv6_devconf.accept_ra_mtu, 7143 .maxlen = sizeof(int), 7144 .mode = 0644, 7145 .proc_handler = proc_dointvec, 7146 }, 7147 { 7148 .procname = "stable_secret", 7149 .data = &ipv6_devconf.stable_secret, 7150 .maxlen = IPV6_MAX_STRLEN, 7151 .mode = 0600, 7152 .proc_handler = addrconf_sysctl_stable_secret, 7153 }, 7154 { 7155 .procname = "use_oif_addrs_only", 7156 .data = &ipv6_devconf.use_oif_addrs_only, 7157 .maxlen = sizeof(int), 7158 .mode = 0644, 7159 .proc_handler = proc_dointvec, 7160 }, 7161 { 7162 .procname = "ignore_routes_with_linkdown", 7163 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7164 .maxlen = sizeof(int), 7165 .mode = 0644, 7166 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7167 }, 7168 { 7169 .procname = "drop_unicast_in_l2_multicast", 7170 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7171 .maxlen = sizeof(int), 7172 .mode = 0644, 7173 .proc_handler = proc_dointvec, 7174 }, 7175 { 7176 .procname = "drop_unsolicited_na", 7177 .data = &ipv6_devconf.drop_unsolicited_na, 7178 .maxlen = sizeof(int), 7179 .mode = 0644, 7180 .proc_handler = proc_dointvec, 7181 }, 7182 { 7183 .procname = "keep_addr_on_down", 7184 .data = &ipv6_devconf.keep_addr_on_down, 7185 .maxlen = sizeof(int), 7186 .mode = 0644, 7187 .proc_handler = proc_dointvec, 7188 7189 }, 7190 { 7191 .procname = "seg6_enabled", 7192 .data = &ipv6_devconf.seg6_enabled, 7193 .maxlen = sizeof(int), 7194 .mode = 0644, 7195 .proc_handler = proc_dointvec, 7196 }, 7197#ifdef CONFIG_IPV6_SEG6_HMAC 7198 { 7199 .procname = "seg6_require_hmac", 7200 .data = &ipv6_devconf.seg6_require_hmac, 7201 .maxlen = sizeof(int), 7202 .mode = 0644, 7203 .proc_handler = proc_dointvec, 7204 }, 7205#endif 7206 { 7207 .procname = "enhanced_dad", 7208 .data = &ipv6_devconf.enhanced_dad, 7209 .maxlen = sizeof(int), 7210 .mode = 0644, 7211 .proc_handler = proc_dointvec, 7212 }, 7213 { 7214 .procname = "addr_gen_mode", 7215 .data = &ipv6_devconf.addr_gen_mode, 7216 .maxlen = sizeof(int), 7217 .mode = 0644, 7218 .proc_handler = addrconf_sysctl_addr_gen_mode, 7219 }, 7220 { 7221 .procname = "disable_policy", 7222 .data = &ipv6_devconf.disable_policy, 7223 .maxlen = sizeof(int), 7224 .mode = 0644, 7225 .proc_handler = addrconf_sysctl_disable_policy, 7226 }, 7227 { 7228 .procname = "ndisc_tclass", 7229 .data = &ipv6_devconf.ndisc_tclass, 7230 .maxlen = sizeof(int), 7231 .mode = 0644, 7232 .proc_handler = proc_dointvec_minmax, 7233 .extra1 = (void *)SYSCTL_ZERO, 7234 .extra2 = (void *)&two_five_five, 7235 }, 7236 { 7237 .procname = "rpl_seg_enabled", 7238 .data = &ipv6_devconf.rpl_seg_enabled, 7239 .maxlen = sizeof(int), 7240 .mode = 0644, 7241 .proc_handler = proc_dointvec_minmax, 7242 .extra1 = SYSCTL_ZERO, 7243 .extra2 = SYSCTL_ONE, 7244 }, 7245 { 7246 .procname = "ioam6_enabled", 7247 .data = &ipv6_devconf.ioam6_enabled, 7248 .maxlen = sizeof(u8), 7249 .mode = 0644, 7250 .proc_handler = proc_dou8vec_minmax, 7251 .extra1 = (void *)SYSCTL_ZERO, 7252 .extra2 = (void *)SYSCTL_ONE, 7253 }, 7254 { 7255 .procname = "ioam6_id", 7256 .data = &ipv6_devconf.ioam6_id, 7257 .maxlen = sizeof(u32), 7258 .mode = 0644, 7259 .proc_handler = proc_douintvec_minmax, 7260 .extra1 = (void *)SYSCTL_ZERO, 7261 .extra2 = (void *)&ioam6_if_id_max, 7262 }, 7263 { 7264 .procname = "ioam6_id_wide", 7265 .data = &ipv6_devconf.ioam6_id_wide, 7266 .maxlen = sizeof(u32), 7267 .mode = 0644, 7268 .proc_handler = proc_douintvec, 7269 }, 7270 { 7271 .procname = "ndisc_evict_nocarrier", 7272 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7273 .maxlen = sizeof(u8), 7274 .mode = 0644, 7275 .proc_handler = proc_dou8vec_minmax, 7276 .extra1 = (void *)SYSCTL_ZERO, 7277 .extra2 = (void *)SYSCTL_ONE, 7278 }, 7279 { 7280 .procname = "accept_untracked_na", 7281 .data = &ipv6_devconf.accept_untracked_na, 7282 .maxlen = sizeof(int), 7283 .mode = 0644, 7284 .proc_handler = proc_dointvec_minmax, 7285 .extra1 = SYSCTL_ZERO, 7286 .extra2 = SYSCTL_TWO, 7287 }, 7288 { 7289 .procname = "force_forwarding", 7290 .data = &ipv6_devconf.force_forwarding, 7291 .maxlen = sizeof(int), 7292 .mode = 0644, 7293 .proc_handler = addrconf_sysctl_force_forwarding, 7294 }, 7295}; 7296 7297static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7298 struct inet6_dev *idev, struct ipv6_devconf *p) 7299{ 7300 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7301 int i, ifindex; 7302 struct ctl_table *table; 7303 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7304 7305 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7306 if (!table) 7307 goto out; 7308 7309 for (i = 0; i < table_size; i++) { 7310 table[i].data += (char *)p - (char *)&ipv6_devconf; 7311 /* If one of these is already set, then it is not safe to 7312 * overwrite either of them: this makes proc_dointvec_minmax 7313 * usable. 7314 */ 7315 if (!table[i].extra1 && !table[i].extra2) { 7316 table[i].extra1 = idev; /* embedded; no ref */ 7317 table[i].extra2 = net; 7318 } 7319 } 7320 7321 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7322 7323 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7324 table_size); 7325 if (!p->sysctl_header) 7326 goto free; 7327 7328 if (!strcmp(dev_name, "all")) 7329 ifindex = NETCONFA_IFINDEX_ALL; 7330 else if (!strcmp(dev_name, "default")) 7331 ifindex = NETCONFA_IFINDEX_DEFAULT; 7332 else 7333 ifindex = idev->dev->ifindex; 7334 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7335 ifindex, p); 7336 return 0; 7337 7338free: 7339 kfree(table); 7340out: 7341 return -ENOBUFS; 7342} 7343 7344static void __addrconf_sysctl_unregister(struct net *net, 7345 struct ipv6_devconf *p, int ifindex) 7346{ 7347 const struct ctl_table *table; 7348 7349 if (!p->sysctl_header) 7350 return; 7351 7352 table = p->sysctl_header->ctl_table_arg; 7353 unregister_net_sysctl_table(p->sysctl_header); 7354 p->sysctl_header = NULL; 7355 kfree(table); 7356 7357 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7358} 7359 7360static int addrconf_sysctl_register(struct inet6_dev *idev) 7361{ 7362 int err; 7363 7364 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7365 return -EINVAL; 7366 7367 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7368 &ndisc_ifinfo_sysctl_change); 7369 if (err) 7370 return err; 7371 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7372 idev, &idev->cnf); 7373 if (err) 7374 neigh_sysctl_unregister(idev->nd_parms); 7375 7376 return err; 7377} 7378 7379static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7380{ 7381 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7382 idev->dev->ifindex); 7383 neigh_sysctl_unregister(idev->nd_parms); 7384} 7385 7386 7387#endif 7388 7389static int __net_init addrconf_init_net(struct net *net) 7390{ 7391 int err = -ENOMEM; 7392 struct ipv6_devconf *all, *dflt; 7393 7394 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7395 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7396 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7397 sizeof(struct hlist_head), 7398 GFP_KERNEL); 7399 if (!net->ipv6.inet6_addr_lst) 7400 goto err_alloc_addr; 7401 7402 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7403 if (!all) 7404 goto err_alloc_all; 7405 7406 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7407 if (!dflt) 7408 goto err_alloc_dflt; 7409 7410 if (!net_eq(net, &init_net)) { 7411 switch (net_inherit_devconf()) { 7412 case 1: /* copy from init_net */ 7413 memcpy(all, init_net.ipv6.devconf_all, 7414 sizeof(ipv6_devconf)); 7415 memcpy(dflt, init_net.ipv6.devconf_dflt, 7416 sizeof(ipv6_devconf_dflt)); 7417 break; 7418 case 3: /* copy from the current netns */ 7419 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7420 sizeof(ipv6_devconf)); 7421 memcpy(dflt, 7422 current->nsproxy->net_ns->ipv6.devconf_dflt, 7423 sizeof(ipv6_devconf_dflt)); 7424 break; 7425 case 0: 7426 case 2: 7427 /* use compiled values */ 7428 break; 7429 } 7430 } 7431 7432 /* these will be inherited by all namespaces */ 7433 dflt->autoconf = ipv6_defaults.autoconf; 7434 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7435 7436 dflt->stable_secret.initialized = false; 7437 all->stable_secret.initialized = false; 7438 7439 net->ipv6.devconf_all = all; 7440 net->ipv6.devconf_dflt = dflt; 7441 7442#ifdef CONFIG_SYSCTL 7443 err = __addrconf_sysctl_register(net, "all", NULL, all); 7444 if (err < 0) 7445 goto err_reg_all; 7446 7447 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7448 if (err < 0) 7449 goto err_reg_dflt; 7450#endif 7451 return 0; 7452 7453#ifdef CONFIG_SYSCTL 7454err_reg_dflt: 7455 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7456err_reg_all: 7457 kfree(dflt); 7458 net->ipv6.devconf_dflt = NULL; 7459#endif 7460err_alloc_dflt: 7461 kfree(all); 7462 net->ipv6.devconf_all = NULL; 7463err_alloc_all: 7464 kfree(net->ipv6.inet6_addr_lst); 7465err_alloc_addr: 7466 return err; 7467} 7468 7469static void __net_exit addrconf_exit_net(struct net *net) 7470{ 7471 int i; 7472 7473#ifdef CONFIG_SYSCTL 7474 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7475 NETCONFA_IFINDEX_DEFAULT); 7476 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7477 NETCONFA_IFINDEX_ALL); 7478#endif 7479 kfree(net->ipv6.devconf_dflt); 7480 net->ipv6.devconf_dflt = NULL; 7481 kfree(net->ipv6.devconf_all); 7482 net->ipv6.devconf_all = NULL; 7483 7484 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7485 /* 7486 * Check hash table, then free it. 7487 */ 7488 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7489 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7490 7491 kfree(net->ipv6.inet6_addr_lst); 7492 net->ipv6.inet6_addr_lst = NULL; 7493} 7494 7495static struct pernet_operations addrconf_ops = { 7496 .init = addrconf_init_net, 7497 .exit = addrconf_exit_net, 7498}; 7499 7500static struct rtnl_af_ops inet6_ops __read_mostly = { 7501 .family = AF_INET6, 7502 .fill_link_af = inet6_fill_link_af, 7503 .get_link_af_size = inet6_get_link_af_size, 7504 .validate_link_af = inet6_validate_link_af, 7505 .set_link_af = inet6_set_link_af, 7506}; 7507 7508static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = { 7509 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK, 7510 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7511 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR, 7512 .doit = inet6_rtm_newaddr, .flags = RTNL_FLAG_DOIT_PERNET}, 7513 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR, 7514 .doit = inet6_rtm_deladdr, .flags = RTNL_FLAG_DOIT_PERNET}, 7515 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR, 7516 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr, 7517 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7518 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST, 7519 .dumpit = inet6_dump_ifmcaddr, 7520 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7521 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST, 7522 .dumpit = inet6_dump_ifacaddr, 7523 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7524 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF, 7525 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf, 7526 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7527}; 7528 7529/* 7530 * Init / cleanup code 7531 */ 7532 7533int __init addrconf_init(void) 7534{ 7535 struct inet6_dev *idev; 7536 int err; 7537 7538 err = ipv6_addr_label_init(); 7539 if (err < 0) { 7540 pr_crit("%s: cannot initialize default policy table: %d\n", 7541 __func__, err); 7542 goto out; 7543 } 7544 7545 err = register_pernet_subsys(&addrconf_ops); 7546 if (err < 0) 7547 goto out_addrlabel; 7548 7549 /* All works using addrconf_wq need to lock rtnl. */ 7550 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7551 if (!addrconf_wq) { 7552 err = -ENOMEM; 7553 goto out_nowq; 7554 } 7555 7556 rtnl_net_lock(&init_net); 7557 idev = ipv6_add_dev(blackhole_netdev); 7558 rtnl_net_unlock(&init_net); 7559 if (IS_ERR(idev)) { 7560 err = PTR_ERR(idev); 7561 goto errlo; 7562 } 7563 7564 ip6_route_init_special_entries(); 7565 7566 register_netdevice_notifier(&ipv6_dev_notf); 7567 7568 addrconf_verify(&init_net); 7569 7570 err = rtnl_af_register(&inet6_ops); 7571 if (err) 7572 goto erraf; 7573 7574 err = rtnl_register_many(addrconf_rtnl_msg_handlers); 7575 if (err) 7576 goto errout; 7577 7578 err = ipv6_addr_label_rtnl_register(); 7579 if (err < 0) 7580 goto errout; 7581 7582 return 0; 7583errout: 7584 rtnl_unregister_all(PF_INET6); 7585 rtnl_af_unregister(&inet6_ops); 7586erraf: 7587 unregister_netdevice_notifier(&ipv6_dev_notf); 7588errlo: 7589 destroy_workqueue(addrconf_wq); 7590out_nowq: 7591 unregister_pernet_subsys(&addrconf_ops); 7592out_addrlabel: 7593 ipv6_addr_label_cleanup(); 7594out: 7595 return err; 7596} 7597 7598void addrconf_cleanup(void) 7599{ 7600 struct net_device *dev; 7601 7602 unregister_netdevice_notifier(&ipv6_dev_notf); 7603 unregister_pernet_subsys(&addrconf_ops); 7604 ipv6_addr_label_cleanup(); 7605 7606 rtnl_af_unregister(&inet6_ops); 7607 7608 rtnl_net_lock(&init_net); 7609 7610 /* clean dev list */ 7611 for_each_netdev(&init_net, dev) { 7612 if (!__in6_dev_get_rtnl_net(dev)) 7613 continue; 7614 addrconf_ifdown(dev, true); 7615 } 7616 addrconf_ifdown(init_net.loopback_dev, true); 7617 7618 rtnl_net_unlock(&init_net); 7619 7620 destroy_workqueue(addrconf_wq); 7621}
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