devinet.c revision cc535dfb6a85b42218307c43f60668d7bd6f4318
1/* 2 * NET3 IP device support routines. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Derived from the IP parts of dev.c 1.0.19 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Mark Evans, <evansmp@uhura.aston.ac.uk> 13 * 14 * Additional Authors: 15 * Alan Cox, <gw4pts@gw4pts.ampr.org> 16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 17 * 18 * Changes: 19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr 20 * lists. 21 * Cyrus Durgin: updated for kmod 22 * Matthias Andree: in devinet_ioctl, compare label and 23 * address (4.4BSD alias style support), 24 * fall back to comparing just the label 25 * if no match found. 26 */ 27 28 29#include <asm/uaccess.h> 30#include <linux/bitops.h> 31#include <linux/capability.h> 32#include <linux/module.h> 33#include <linux/types.h> 34#include <linux/kernel.h> 35#include <linux/string.h> 36#include <linux/mm.h> 37#include <linux/socket.h> 38#include <linux/sockios.h> 39#include <linux/in.h> 40#include <linux/errno.h> 41#include <linux/interrupt.h> 42#include <linux/if_addr.h> 43#include <linux/if_ether.h> 44#include <linux/inet.h> 45#include <linux/netdevice.h> 46#include <linux/etherdevice.h> 47#include <linux/skbuff.h> 48#include <linux/init.h> 49#include <linux/notifier.h> 50#include <linux/inetdevice.h> 51#include <linux/igmp.h> 52#include <linux/slab.h> 53#include <linux/hash.h> 54#ifdef CONFIG_SYSCTL 55#include <linux/sysctl.h> 56#endif 57#include <linux/kmod.h> 58#include <linux/netconf.h> 59 60#include <net/arp.h> 61#include <net/ip.h> 62#include <net/route.h> 63#include <net/ip_fib.h> 64#include <net/rtnetlink.h> 65#include <net/net_namespace.h> 66 67#include "fib_lookup.h" 68 69static struct ipv4_devconf ipv4_devconf = { 70 .data = { 71 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, 72 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, 73 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, 74 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, 75 }, 76}; 77 78static struct ipv4_devconf ipv4_devconf_dflt = { 79 .data = { 80 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, 81 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1, 82 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1, 83 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1, 84 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1, 85 }, 86}; 87 88#define IPV4_DEVCONF_DFLT(net, attr) \ 89 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) 90 91static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { 92 [IFA_LOCAL] = { .type = NLA_U32 }, 93 [IFA_ADDRESS] = { .type = NLA_U32 }, 94 [IFA_BROADCAST] = { .type = NLA_U32 }, 95 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 96}; 97 98#define IN4_ADDR_HSIZE_SHIFT 8 99#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT) 100 101static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE]; 102static DEFINE_SPINLOCK(inet_addr_hash_lock); 103 104static u32 inet_addr_hash(struct net *net, __be32 addr) 105{ 106 u32 val = (__force u32) addr ^ net_hash_mix(net); 107 108 return hash_32(val, IN4_ADDR_HSIZE_SHIFT); 109} 110 111static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa) 112{ 113 u32 hash = inet_addr_hash(net, ifa->ifa_local); 114 115 spin_lock(&inet_addr_hash_lock); 116 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]); 117 spin_unlock(&inet_addr_hash_lock); 118} 119 120static void inet_hash_remove(struct in_ifaddr *ifa) 121{ 122 spin_lock(&inet_addr_hash_lock); 123 hlist_del_init_rcu(&ifa->hash); 124 spin_unlock(&inet_addr_hash_lock); 125} 126 127/** 128 * __ip_dev_find - find the first device with a given source address. 129 * @net: the net namespace 130 * @addr: the source address 131 * @devref: if true, take a reference on the found device 132 * 133 * If a caller uses devref=false, it should be protected by RCU, or RTNL 134 */ 135struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref) 136{ 137 u32 hash = inet_addr_hash(net, addr); 138 struct net_device *result = NULL; 139 struct in_ifaddr *ifa; 140 struct hlist_node *node; 141 142 rcu_read_lock(); 143 hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) { 144 if (ifa->ifa_local == addr) { 145 struct net_device *dev = ifa->ifa_dev->dev; 146 147 if (!net_eq(dev_net(dev), net)) 148 continue; 149 result = dev; 150 break; 151 } 152 } 153 if (!result) { 154 struct flowi4 fl4 = { .daddr = addr }; 155 struct fib_result res = { 0 }; 156 struct fib_table *local; 157 158 /* Fallback to FIB local table so that communication 159 * over loopback subnets work. 160 */ 161 local = fib_get_table(net, RT_TABLE_LOCAL); 162 if (local && 163 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) && 164 res.type == RTN_LOCAL) 165 result = FIB_RES_DEV(res); 166 } 167 if (result && devref) 168 dev_hold(result); 169 rcu_read_unlock(); 170 return result; 171} 172EXPORT_SYMBOL(__ip_dev_find); 173 174static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 175 176static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 177static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 178 int destroy); 179#ifdef CONFIG_SYSCTL 180static void devinet_sysctl_register(struct in_device *idev); 181static void devinet_sysctl_unregister(struct in_device *idev); 182#else 183static void devinet_sysctl_register(struct in_device *idev) 184{ 185} 186static void devinet_sysctl_unregister(struct in_device *idev) 187{ 188} 189#endif 190 191/* Locks all the inet devices. */ 192 193static struct in_ifaddr *inet_alloc_ifa(void) 194{ 195 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 196} 197 198static void inet_rcu_free_ifa(struct rcu_head *head) 199{ 200 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 201 if (ifa->ifa_dev) 202 in_dev_put(ifa->ifa_dev); 203 kfree(ifa); 204} 205 206static void inet_free_ifa(struct in_ifaddr *ifa) 207{ 208 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 209} 210 211void in_dev_finish_destroy(struct in_device *idev) 212{ 213 struct net_device *dev = idev->dev; 214 215 WARN_ON(idev->ifa_list); 216 WARN_ON(idev->mc_list); 217#ifdef NET_REFCNT_DEBUG 218 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL"); 219#endif 220 dev_put(dev); 221 if (!idev->dead) 222 pr_err("Freeing alive in_device %p\n", idev); 223 else 224 kfree(idev); 225} 226EXPORT_SYMBOL(in_dev_finish_destroy); 227 228static struct in_device *inetdev_init(struct net_device *dev) 229{ 230 struct in_device *in_dev; 231 232 ASSERT_RTNL(); 233 234 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 235 if (!in_dev) 236 goto out; 237 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 238 sizeof(in_dev->cnf)); 239 in_dev->cnf.sysctl = NULL; 240 in_dev->dev = dev; 241 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl); 242 if (!in_dev->arp_parms) 243 goto out_kfree; 244 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 245 dev_disable_lro(dev); 246 /* Reference in_dev->dev */ 247 dev_hold(dev); 248 /* Account for reference dev->ip_ptr (below) */ 249 in_dev_hold(in_dev); 250 251 devinet_sysctl_register(in_dev); 252 ip_mc_init_dev(in_dev); 253 if (dev->flags & IFF_UP) 254 ip_mc_up(in_dev); 255 256 /* we can receive as soon as ip_ptr is set -- do this last */ 257 rcu_assign_pointer(dev->ip_ptr, in_dev); 258out: 259 return in_dev; 260out_kfree: 261 kfree(in_dev); 262 in_dev = NULL; 263 goto out; 264} 265 266static void in_dev_rcu_put(struct rcu_head *head) 267{ 268 struct in_device *idev = container_of(head, struct in_device, rcu_head); 269 in_dev_put(idev); 270} 271 272static void inetdev_destroy(struct in_device *in_dev) 273{ 274 struct in_ifaddr *ifa; 275 struct net_device *dev; 276 277 ASSERT_RTNL(); 278 279 dev = in_dev->dev; 280 281 in_dev->dead = 1; 282 283 ip_mc_destroy_dev(in_dev); 284 285 while ((ifa = in_dev->ifa_list) != NULL) { 286 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 287 inet_free_ifa(ifa); 288 } 289 290 RCU_INIT_POINTER(dev->ip_ptr, NULL); 291 292 devinet_sysctl_unregister(in_dev); 293 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 294 arp_ifdown(dev); 295 296 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 297} 298 299int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 300{ 301 rcu_read_lock(); 302 for_primary_ifa(in_dev) { 303 if (inet_ifa_match(a, ifa)) { 304 if (!b || inet_ifa_match(b, ifa)) { 305 rcu_read_unlock(); 306 return 1; 307 } 308 } 309 } endfor_ifa(in_dev); 310 rcu_read_unlock(); 311 return 0; 312} 313 314static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 315 int destroy, struct nlmsghdr *nlh, u32 portid) 316{ 317 struct in_ifaddr *promote = NULL; 318 struct in_ifaddr *ifa, *ifa1 = *ifap; 319 struct in_ifaddr *last_prim = in_dev->ifa_list; 320 struct in_ifaddr *prev_prom = NULL; 321 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 322 323 ASSERT_RTNL(); 324 325 /* 1. Deleting primary ifaddr forces deletion all secondaries 326 * unless alias promotion is set 327 **/ 328 329 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 330 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 331 332 while ((ifa = *ifap1) != NULL) { 333 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 334 ifa1->ifa_scope <= ifa->ifa_scope) 335 last_prim = ifa; 336 337 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 338 ifa1->ifa_mask != ifa->ifa_mask || 339 !inet_ifa_match(ifa1->ifa_address, ifa)) { 340 ifap1 = &ifa->ifa_next; 341 prev_prom = ifa; 342 continue; 343 } 344 345 if (!do_promote) { 346 inet_hash_remove(ifa); 347 *ifap1 = ifa->ifa_next; 348 349 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid); 350 blocking_notifier_call_chain(&inetaddr_chain, 351 NETDEV_DOWN, ifa); 352 inet_free_ifa(ifa); 353 } else { 354 promote = ifa; 355 break; 356 } 357 } 358 } 359 360 /* On promotion all secondaries from subnet are changing 361 * the primary IP, we must remove all their routes silently 362 * and later to add them back with new prefsrc. Do this 363 * while all addresses are on the device list. 364 */ 365 for (ifa = promote; ifa; ifa = ifa->ifa_next) { 366 if (ifa1->ifa_mask == ifa->ifa_mask && 367 inet_ifa_match(ifa1->ifa_address, ifa)) 368 fib_del_ifaddr(ifa, ifa1); 369 } 370 371 /* 2. Unlink it */ 372 373 *ifap = ifa1->ifa_next; 374 inet_hash_remove(ifa1); 375 376 /* 3. Announce address deletion */ 377 378 /* Send message first, then call notifier. 379 At first sight, FIB update triggered by notifier 380 will refer to already deleted ifaddr, that could confuse 381 netlink listeners. It is not true: look, gated sees 382 that route deleted and if it still thinks that ifaddr 383 is valid, it will try to restore deleted routes... Grr. 384 So that, this order is correct. 385 */ 386 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid); 387 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 388 389 if (promote) { 390 struct in_ifaddr *next_sec = promote->ifa_next; 391 392 if (prev_prom) { 393 prev_prom->ifa_next = promote->ifa_next; 394 promote->ifa_next = last_prim->ifa_next; 395 last_prim->ifa_next = promote; 396 } 397 398 promote->ifa_flags &= ~IFA_F_SECONDARY; 399 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid); 400 blocking_notifier_call_chain(&inetaddr_chain, 401 NETDEV_UP, promote); 402 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) { 403 if (ifa1->ifa_mask != ifa->ifa_mask || 404 !inet_ifa_match(ifa1->ifa_address, ifa)) 405 continue; 406 fib_add_ifaddr(ifa); 407 } 408 409 } 410 if (destroy) 411 inet_free_ifa(ifa1); 412} 413 414static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 415 int destroy) 416{ 417 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 418} 419 420static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 421 u32 portid) 422{ 423 struct in_device *in_dev = ifa->ifa_dev; 424 struct in_ifaddr *ifa1, **ifap, **last_primary; 425 426 ASSERT_RTNL(); 427 428 if (!ifa->ifa_local) { 429 inet_free_ifa(ifa); 430 return 0; 431 } 432 433 ifa->ifa_flags &= ~IFA_F_SECONDARY; 434 last_primary = &in_dev->ifa_list; 435 436 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 437 ifap = &ifa1->ifa_next) { 438 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 439 ifa->ifa_scope <= ifa1->ifa_scope) 440 last_primary = &ifa1->ifa_next; 441 if (ifa1->ifa_mask == ifa->ifa_mask && 442 inet_ifa_match(ifa1->ifa_address, ifa)) { 443 if (ifa1->ifa_local == ifa->ifa_local) { 444 inet_free_ifa(ifa); 445 return -EEXIST; 446 } 447 if (ifa1->ifa_scope != ifa->ifa_scope) { 448 inet_free_ifa(ifa); 449 return -EINVAL; 450 } 451 ifa->ifa_flags |= IFA_F_SECONDARY; 452 } 453 } 454 455 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 456 net_srandom(ifa->ifa_local); 457 ifap = last_primary; 458 } 459 460 ifa->ifa_next = *ifap; 461 *ifap = ifa; 462 463 inet_hash_insert(dev_net(in_dev->dev), ifa); 464 465 /* Send message first, then call notifier. 466 Notifier will trigger FIB update, so that 467 listeners of netlink will know about new ifaddr */ 468 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid); 469 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 470 471 return 0; 472} 473 474static int inet_insert_ifa(struct in_ifaddr *ifa) 475{ 476 return __inet_insert_ifa(ifa, NULL, 0); 477} 478 479static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 480{ 481 struct in_device *in_dev = __in_dev_get_rtnl(dev); 482 483 ASSERT_RTNL(); 484 485 if (!in_dev) { 486 inet_free_ifa(ifa); 487 return -ENOBUFS; 488 } 489 ipv4_devconf_setall(in_dev); 490 if (ifa->ifa_dev != in_dev) { 491 WARN_ON(ifa->ifa_dev); 492 in_dev_hold(in_dev); 493 ifa->ifa_dev = in_dev; 494 } 495 if (ipv4_is_loopback(ifa->ifa_local)) 496 ifa->ifa_scope = RT_SCOPE_HOST; 497 return inet_insert_ifa(ifa); 498} 499 500/* Caller must hold RCU or RTNL : 501 * We dont take a reference on found in_device 502 */ 503struct in_device *inetdev_by_index(struct net *net, int ifindex) 504{ 505 struct net_device *dev; 506 struct in_device *in_dev = NULL; 507 508 rcu_read_lock(); 509 dev = dev_get_by_index_rcu(net, ifindex); 510 if (dev) 511 in_dev = rcu_dereference_rtnl(dev->ip_ptr); 512 rcu_read_unlock(); 513 return in_dev; 514} 515EXPORT_SYMBOL(inetdev_by_index); 516 517/* Called only from RTNL semaphored context. No locks. */ 518 519struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 520 __be32 mask) 521{ 522 ASSERT_RTNL(); 523 524 for_primary_ifa(in_dev) { 525 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 526 return ifa; 527 } endfor_ifa(in_dev); 528 return NULL; 529} 530 531static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 532{ 533 struct net *net = sock_net(skb->sk); 534 struct nlattr *tb[IFA_MAX+1]; 535 struct in_device *in_dev; 536 struct ifaddrmsg *ifm; 537 struct in_ifaddr *ifa, **ifap; 538 int err = -EINVAL; 539 540 ASSERT_RTNL(); 541 542 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 543 if (err < 0) 544 goto errout; 545 546 ifm = nlmsg_data(nlh); 547 in_dev = inetdev_by_index(net, ifm->ifa_index); 548 if (in_dev == NULL) { 549 err = -ENODEV; 550 goto errout; 551 } 552 553 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 554 ifap = &ifa->ifa_next) { 555 if (tb[IFA_LOCAL] && 556 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 557 continue; 558 559 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 560 continue; 561 562 if (tb[IFA_ADDRESS] && 563 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 564 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 565 continue; 566 567 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid); 568 return 0; 569 } 570 571 err = -EADDRNOTAVAIL; 572errout: 573 return err; 574} 575 576static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) 577{ 578 struct nlattr *tb[IFA_MAX+1]; 579 struct in_ifaddr *ifa; 580 struct ifaddrmsg *ifm; 581 struct net_device *dev; 582 struct in_device *in_dev; 583 int err; 584 585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 586 if (err < 0) 587 goto errout; 588 589 ifm = nlmsg_data(nlh); 590 err = -EINVAL; 591 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 592 goto errout; 593 594 dev = __dev_get_by_index(net, ifm->ifa_index); 595 err = -ENODEV; 596 if (dev == NULL) 597 goto errout; 598 599 in_dev = __in_dev_get_rtnl(dev); 600 err = -ENOBUFS; 601 if (in_dev == NULL) 602 goto errout; 603 604 ifa = inet_alloc_ifa(); 605 if (ifa == NULL) 606 /* 607 * A potential indev allocation can be left alive, it stays 608 * assigned to its device and is destroy with it. 609 */ 610 goto errout; 611 612 ipv4_devconf_setall(in_dev); 613 in_dev_hold(in_dev); 614 615 if (tb[IFA_ADDRESS] == NULL) 616 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 617 618 INIT_HLIST_NODE(&ifa->hash); 619 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 620 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 621 ifa->ifa_flags = ifm->ifa_flags; 622 ifa->ifa_scope = ifm->ifa_scope; 623 ifa->ifa_dev = in_dev; 624 625 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 626 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 627 628 if (tb[IFA_BROADCAST]) 629 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 630 631 if (tb[IFA_LABEL]) 632 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 633 else 634 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 635 636 return ifa; 637 638errout: 639 return ERR_PTR(err); 640} 641 642static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 643{ 644 struct net *net = sock_net(skb->sk); 645 struct in_ifaddr *ifa; 646 647 ASSERT_RTNL(); 648 649 ifa = rtm_to_ifaddr(net, nlh); 650 if (IS_ERR(ifa)) 651 return PTR_ERR(ifa); 652 653 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid); 654} 655 656/* 657 * Determine a default network mask, based on the IP address. 658 */ 659 660static int inet_abc_len(__be32 addr) 661{ 662 int rc = -1; /* Something else, probably a multicast. */ 663 664 if (ipv4_is_zeronet(addr)) 665 rc = 0; 666 else { 667 __u32 haddr = ntohl(addr); 668 669 if (IN_CLASSA(haddr)) 670 rc = 8; 671 else if (IN_CLASSB(haddr)) 672 rc = 16; 673 else if (IN_CLASSC(haddr)) 674 rc = 24; 675 } 676 677 return rc; 678} 679 680 681int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 682{ 683 struct ifreq ifr; 684 struct sockaddr_in sin_orig; 685 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 686 struct in_device *in_dev; 687 struct in_ifaddr **ifap = NULL; 688 struct in_ifaddr *ifa = NULL; 689 struct net_device *dev; 690 char *colon; 691 int ret = -EFAULT; 692 int tryaddrmatch = 0; 693 694 /* 695 * Fetch the caller's info block into kernel space 696 */ 697 698 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 699 goto out; 700 ifr.ifr_name[IFNAMSIZ - 1] = 0; 701 702 /* save original address for comparison */ 703 memcpy(&sin_orig, sin, sizeof(*sin)); 704 705 colon = strchr(ifr.ifr_name, ':'); 706 if (colon) 707 *colon = 0; 708 709 dev_load(net, ifr.ifr_name); 710 711 switch (cmd) { 712 case SIOCGIFADDR: /* Get interface address */ 713 case SIOCGIFBRDADDR: /* Get the broadcast address */ 714 case SIOCGIFDSTADDR: /* Get the destination address */ 715 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 716 /* Note that these ioctls will not sleep, 717 so that we do not impose a lock. 718 One day we will be forced to put shlock here (I mean SMP) 719 */ 720 tryaddrmatch = (sin_orig.sin_family == AF_INET); 721 memset(sin, 0, sizeof(*sin)); 722 sin->sin_family = AF_INET; 723 break; 724 725 case SIOCSIFFLAGS: 726 ret = -EPERM; 727 if (!capable(CAP_NET_ADMIN)) 728 goto out; 729 break; 730 case SIOCSIFADDR: /* Set interface address (and family) */ 731 case SIOCSIFBRDADDR: /* Set the broadcast address */ 732 case SIOCSIFDSTADDR: /* Set the destination address */ 733 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 734 ret = -EPERM; 735 if (!capable(CAP_NET_ADMIN)) 736 goto out; 737 ret = -EINVAL; 738 if (sin->sin_family != AF_INET) 739 goto out; 740 break; 741 default: 742 ret = -EINVAL; 743 goto out; 744 } 745 746 rtnl_lock(); 747 748 ret = -ENODEV; 749 dev = __dev_get_by_name(net, ifr.ifr_name); 750 if (!dev) 751 goto done; 752 753 if (colon) 754 *colon = ':'; 755 756 in_dev = __in_dev_get_rtnl(dev); 757 if (in_dev) { 758 if (tryaddrmatch) { 759 /* Matthias Andree */ 760 /* compare label and address (4.4BSD style) */ 761 /* note: we only do this for a limited set of ioctls 762 and only if the original address family was AF_INET. 763 This is checked above. */ 764 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 765 ifap = &ifa->ifa_next) { 766 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 767 sin_orig.sin_addr.s_addr == 768 ifa->ifa_local) { 769 break; /* found */ 770 } 771 } 772 } 773 /* we didn't get a match, maybe the application is 774 4.3BSD-style and passed in junk so we fall back to 775 comparing just the label */ 776 if (!ifa) { 777 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 778 ifap = &ifa->ifa_next) 779 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 780 break; 781 } 782 } 783 784 ret = -EADDRNOTAVAIL; 785 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 786 goto done; 787 788 switch (cmd) { 789 case SIOCGIFADDR: /* Get interface address */ 790 sin->sin_addr.s_addr = ifa->ifa_local; 791 goto rarok; 792 793 case SIOCGIFBRDADDR: /* Get the broadcast address */ 794 sin->sin_addr.s_addr = ifa->ifa_broadcast; 795 goto rarok; 796 797 case SIOCGIFDSTADDR: /* Get the destination address */ 798 sin->sin_addr.s_addr = ifa->ifa_address; 799 goto rarok; 800 801 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 802 sin->sin_addr.s_addr = ifa->ifa_mask; 803 goto rarok; 804 805 case SIOCSIFFLAGS: 806 if (colon) { 807 ret = -EADDRNOTAVAIL; 808 if (!ifa) 809 break; 810 ret = 0; 811 if (!(ifr.ifr_flags & IFF_UP)) 812 inet_del_ifa(in_dev, ifap, 1); 813 break; 814 } 815 ret = dev_change_flags(dev, ifr.ifr_flags); 816 break; 817 818 case SIOCSIFADDR: /* Set interface address (and family) */ 819 ret = -EINVAL; 820 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 821 break; 822 823 if (!ifa) { 824 ret = -ENOBUFS; 825 ifa = inet_alloc_ifa(); 826 INIT_HLIST_NODE(&ifa->hash); 827 if (!ifa) 828 break; 829 if (colon) 830 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 831 else 832 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 833 } else { 834 ret = 0; 835 if (ifa->ifa_local == sin->sin_addr.s_addr) 836 break; 837 inet_del_ifa(in_dev, ifap, 0); 838 ifa->ifa_broadcast = 0; 839 ifa->ifa_scope = 0; 840 } 841 842 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 843 844 if (!(dev->flags & IFF_POINTOPOINT)) { 845 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 846 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 847 if ((dev->flags & IFF_BROADCAST) && 848 ifa->ifa_prefixlen < 31) 849 ifa->ifa_broadcast = ifa->ifa_address | 850 ~ifa->ifa_mask; 851 } else { 852 ifa->ifa_prefixlen = 32; 853 ifa->ifa_mask = inet_make_mask(32); 854 } 855 ret = inet_set_ifa(dev, ifa); 856 break; 857 858 case SIOCSIFBRDADDR: /* Set the broadcast address */ 859 ret = 0; 860 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 861 inet_del_ifa(in_dev, ifap, 0); 862 ifa->ifa_broadcast = sin->sin_addr.s_addr; 863 inet_insert_ifa(ifa); 864 } 865 break; 866 867 case SIOCSIFDSTADDR: /* Set the destination address */ 868 ret = 0; 869 if (ifa->ifa_address == sin->sin_addr.s_addr) 870 break; 871 ret = -EINVAL; 872 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 873 break; 874 ret = 0; 875 inet_del_ifa(in_dev, ifap, 0); 876 ifa->ifa_address = sin->sin_addr.s_addr; 877 inet_insert_ifa(ifa); 878 break; 879 880 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 881 882 /* 883 * The mask we set must be legal. 884 */ 885 ret = -EINVAL; 886 if (bad_mask(sin->sin_addr.s_addr, 0)) 887 break; 888 ret = 0; 889 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 890 __be32 old_mask = ifa->ifa_mask; 891 inet_del_ifa(in_dev, ifap, 0); 892 ifa->ifa_mask = sin->sin_addr.s_addr; 893 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 894 895 /* See if current broadcast address matches 896 * with current netmask, then recalculate 897 * the broadcast address. Otherwise it's a 898 * funny address, so don't touch it since 899 * the user seems to know what (s)he's doing... 900 */ 901 if ((dev->flags & IFF_BROADCAST) && 902 (ifa->ifa_prefixlen < 31) && 903 (ifa->ifa_broadcast == 904 (ifa->ifa_local|~old_mask))) { 905 ifa->ifa_broadcast = (ifa->ifa_local | 906 ~sin->sin_addr.s_addr); 907 } 908 inet_insert_ifa(ifa); 909 } 910 break; 911 } 912done: 913 rtnl_unlock(); 914out: 915 return ret; 916rarok: 917 rtnl_unlock(); 918 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 919 goto out; 920} 921 922static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 923{ 924 struct in_device *in_dev = __in_dev_get_rtnl(dev); 925 struct in_ifaddr *ifa; 926 struct ifreq ifr; 927 int done = 0; 928 929 if (!in_dev) 930 goto out; 931 932 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 933 if (!buf) { 934 done += sizeof(ifr); 935 continue; 936 } 937 if (len < (int) sizeof(ifr)) 938 break; 939 memset(&ifr, 0, sizeof(struct ifreq)); 940 if (ifa->ifa_label) 941 strcpy(ifr.ifr_name, ifa->ifa_label); 942 else 943 strcpy(ifr.ifr_name, dev->name); 944 945 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 946 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 947 ifa->ifa_local; 948 949 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 950 done = -EFAULT; 951 break; 952 } 953 buf += sizeof(struct ifreq); 954 len -= sizeof(struct ifreq); 955 done += sizeof(struct ifreq); 956 } 957out: 958 return done; 959} 960 961__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 962{ 963 __be32 addr = 0; 964 struct in_device *in_dev; 965 struct net *net = dev_net(dev); 966 967 rcu_read_lock(); 968 in_dev = __in_dev_get_rcu(dev); 969 if (!in_dev) 970 goto no_in_dev; 971 972 for_primary_ifa(in_dev) { 973 if (ifa->ifa_scope > scope) 974 continue; 975 if (!dst || inet_ifa_match(dst, ifa)) { 976 addr = ifa->ifa_local; 977 break; 978 } 979 if (!addr) 980 addr = ifa->ifa_local; 981 } endfor_ifa(in_dev); 982 983 if (addr) 984 goto out_unlock; 985no_in_dev: 986 987 /* Not loopback addresses on loopback should be preferred 988 in this case. It is importnat that lo is the first interface 989 in dev_base list. 990 */ 991 for_each_netdev_rcu(net, dev) { 992 in_dev = __in_dev_get_rcu(dev); 993 if (!in_dev) 994 continue; 995 996 for_primary_ifa(in_dev) { 997 if (ifa->ifa_scope != RT_SCOPE_LINK && 998 ifa->ifa_scope <= scope) { 999 addr = ifa->ifa_local; 1000 goto out_unlock; 1001 } 1002 } endfor_ifa(in_dev); 1003 } 1004out_unlock: 1005 rcu_read_unlock(); 1006 return addr; 1007} 1008EXPORT_SYMBOL(inet_select_addr); 1009 1010static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 1011 __be32 local, int scope) 1012{ 1013 int same = 0; 1014 __be32 addr = 0; 1015 1016 for_ifa(in_dev) { 1017 if (!addr && 1018 (local == ifa->ifa_local || !local) && 1019 ifa->ifa_scope <= scope) { 1020 addr = ifa->ifa_local; 1021 if (same) 1022 break; 1023 } 1024 if (!same) { 1025 same = (!local || inet_ifa_match(local, ifa)) && 1026 (!dst || inet_ifa_match(dst, ifa)); 1027 if (same && addr) { 1028 if (local || !dst) 1029 break; 1030 /* Is the selected addr into dst subnet? */ 1031 if (inet_ifa_match(addr, ifa)) 1032 break; 1033 /* No, then can we use new local src? */ 1034 if (ifa->ifa_scope <= scope) { 1035 addr = ifa->ifa_local; 1036 break; 1037 } 1038 /* search for large dst subnet for addr */ 1039 same = 0; 1040 } 1041 } 1042 } endfor_ifa(in_dev); 1043 1044 return same ? addr : 0; 1045} 1046 1047/* 1048 * Confirm that local IP address exists using wildcards: 1049 * - in_dev: only on this interface, 0=any interface 1050 * - dst: only in the same subnet as dst, 0=any dst 1051 * - local: address, 0=autoselect the local address 1052 * - scope: maximum allowed scope value for the local address 1053 */ 1054__be32 inet_confirm_addr(struct in_device *in_dev, 1055 __be32 dst, __be32 local, int scope) 1056{ 1057 __be32 addr = 0; 1058 struct net_device *dev; 1059 struct net *net; 1060 1061 if (scope != RT_SCOPE_LINK) 1062 return confirm_addr_indev(in_dev, dst, local, scope); 1063 1064 net = dev_net(in_dev->dev); 1065 rcu_read_lock(); 1066 for_each_netdev_rcu(net, dev) { 1067 in_dev = __in_dev_get_rcu(dev); 1068 if (in_dev) { 1069 addr = confirm_addr_indev(in_dev, dst, local, scope); 1070 if (addr) 1071 break; 1072 } 1073 } 1074 rcu_read_unlock(); 1075 1076 return addr; 1077} 1078EXPORT_SYMBOL(inet_confirm_addr); 1079 1080/* 1081 * Device notifier 1082 */ 1083 1084int register_inetaddr_notifier(struct notifier_block *nb) 1085{ 1086 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1087} 1088EXPORT_SYMBOL(register_inetaddr_notifier); 1089 1090int unregister_inetaddr_notifier(struct notifier_block *nb) 1091{ 1092 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1093} 1094EXPORT_SYMBOL(unregister_inetaddr_notifier); 1095 1096/* Rename ifa_labels for a device name change. Make some effort to preserve 1097 * existing alias numbering and to create unique labels if possible. 1098*/ 1099static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1100{ 1101 struct in_ifaddr *ifa; 1102 int named = 0; 1103 1104 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1105 char old[IFNAMSIZ], *dot; 1106 1107 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1108 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1109 if (named++ == 0) 1110 goto skip; 1111 dot = strchr(old, ':'); 1112 if (dot == NULL) { 1113 sprintf(old, ":%d", named); 1114 dot = old; 1115 } 1116 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) 1117 strcat(ifa->ifa_label, dot); 1118 else 1119 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1120skip: 1121 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1122 } 1123} 1124 1125static bool inetdev_valid_mtu(unsigned int mtu) 1126{ 1127 return mtu >= 68; 1128} 1129 1130static void inetdev_send_gratuitous_arp(struct net_device *dev, 1131 struct in_device *in_dev) 1132 1133{ 1134 struct in_ifaddr *ifa; 1135 1136 for (ifa = in_dev->ifa_list; ifa; 1137 ifa = ifa->ifa_next) { 1138 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1139 ifa->ifa_local, dev, 1140 ifa->ifa_local, NULL, 1141 dev->dev_addr, NULL); 1142 } 1143} 1144 1145/* Called only under RTNL semaphore */ 1146 1147static int inetdev_event(struct notifier_block *this, unsigned long event, 1148 void *ptr) 1149{ 1150 struct net_device *dev = ptr; 1151 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1152 1153 ASSERT_RTNL(); 1154 1155 if (!in_dev) { 1156 if (event == NETDEV_REGISTER) { 1157 in_dev = inetdev_init(dev); 1158 if (!in_dev) 1159 return notifier_from_errno(-ENOMEM); 1160 if (dev->flags & IFF_LOOPBACK) { 1161 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1162 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1163 } 1164 } else if (event == NETDEV_CHANGEMTU) { 1165 /* Re-enabling IP */ 1166 if (inetdev_valid_mtu(dev->mtu)) 1167 in_dev = inetdev_init(dev); 1168 } 1169 goto out; 1170 } 1171 1172 switch (event) { 1173 case NETDEV_REGISTER: 1174 pr_debug("%s: bug\n", __func__); 1175 RCU_INIT_POINTER(dev->ip_ptr, NULL); 1176 break; 1177 case NETDEV_UP: 1178 if (!inetdev_valid_mtu(dev->mtu)) 1179 break; 1180 if (dev->flags & IFF_LOOPBACK) { 1181 struct in_ifaddr *ifa = inet_alloc_ifa(); 1182 1183 if (ifa) { 1184 INIT_HLIST_NODE(&ifa->hash); 1185 ifa->ifa_local = 1186 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1187 ifa->ifa_prefixlen = 8; 1188 ifa->ifa_mask = inet_make_mask(8); 1189 in_dev_hold(in_dev); 1190 ifa->ifa_dev = in_dev; 1191 ifa->ifa_scope = RT_SCOPE_HOST; 1192 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1193 inet_insert_ifa(ifa); 1194 } 1195 } 1196 ip_mc_up(in_dev); 1197 /* fall through */ 1198 case NETDEV_CHANGEADDR: 1199 if (!IN_DEV_ARP_NOTIFY(in_dev)) 1200 break; 1201 /* fall through */ 1202 case NETDEV_NOTIFY_PEERS: 1203 /* Send gratuitous ARP to notify of link change */ 1204 inetdev_send_gratuitous_arp(dev, in_dev); 1205 break; 1206 case NETDEV_DOWN: 1207 ip_mc_down(in_dev); 1208 break; 1209 case NETDEV_PRE_TYPE_CHANGE: 1210 ip_mc_unmap(in_dev); 1211 break; 1212 case NETDEV_POST_TYPE_CHANGE: 1213 ip_mc_remap(in_dev); 1214 break; 1215 case NETDEV_CHANGEMTU: 1216 if (inetdev_valid_mtu(dev->mtu)) 1217 break; 1218 /* disable IP when MTU is not enough */ 1219 case NETDEV_UNREGISTER: 1220 inetdev_destroy(in_dev); 1221 break; 1222 case NETDEV_CHANGENAME: 1223 /* Do not notify about label change, this event is 1224 * not interesting to applications using netlink. 1225 */ 1226 inetdev_changename(dev, in_dev); 1227 1228 devinet_sysctl_unregister(in_dev); 1229 devinet_sysctl_register(in_dev); 1230 break; 1231 } 1232out: 1233 return NOTIFY_DONE; 1234} 1235 1236static struct notifier_block ip_netdev_notifier = { 1237 .notifier_call = inetdev_event, 1238}; 1239 1240static size_t inet_nlmsg_size(void) 1241{ 1242 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1243 + nla_total_size(4) /* IFA_ADDRESS */ 1244 + nla_total_size(4) /* IFA_LOCAL */ 1245 + nla_total_size(4) /* IFA_BROADCAST */ 1246 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1247} 1248 1249static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1250 u32 portid, u32 seq, int event, unsigned int flags) 1251{ 1252 struct ifaddrmsg *ifm; 1253 struct nlmsghdr *nlh; 1254 1255 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); 1256 if (nlh == NULL) 1257 return -EMSGSIZE; 1258 1259 ifm = nlmsg_data(nlh); 1260 ifm->ifa_family = AF_INET; 1261 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1262 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; 1263 ifm->ifa_scope = ifa->ifa_scope; 1264 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1265 1266 if ((ifa->ifa_address && 1267 nla_put_be32(skb, IFA_ADDRESS, ifa->ifa_address)) || 1268 (ifa->ifa_local && 1269 nla_put_be32(skb, IFA_LOCAL, ifa->ifa_local)) || 1270 (ifa->ifa_broadcast && 1271 nla_put_be32(skb, IFA_BROADCAST, ifa->ifa_broadcast)) || 1272 (ifa->ifa_label[0] && 1273 nla_put_string(skb, IFA_LABEL, ifa->ifa_label))) 1274 goto nla_put_failure; 1275 1276 return nlmsg_end(skb, nlh); 1277 1278nla_put_failure: 1279 nlmsg_cancel(skb, nlh); 1280 return -EMSGSIZE; 1281} 1282 1283static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1284{ 1285 struct net *net = sock_net(skb->sk); 1286 int h, s_h; 1287 int idx, s_idx; 1288 int ip_idx, s_ip_idx; 1289 struct net_device *dev; 1290 struct in_device *in_dev; 1291 struct in_ifaddr *ifa; 1292 struct hlist_head *head; 1293 struct hlist_node *node; 1294 1295 s_h = cb->args[0]; 1296 s_idx = idx = cb->args[1]; 1297 s_ip_idx = ip_idx = cb->args[2]; 1298 1299 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 1300 idx = 0; 1301 head = &net->dev_index_head[h]; 1302 rcu_read_lock(); 1303 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 1304 if (idx < s_idx) 1305 goto cont; 1306 if (h > s_h || idx > s_idx) 1307 s_ip_idx = 0; 1308 in_dev = __in_dev_get_rcu(dev); 1309 if (!in_dev) 1310 goto cont; 1311 1312 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1313 ifa = ifa->ifa_next, ip_idx++) { 1314 if (ip_idx < s_ip_idx) 1315 continue; 1316 if (inet_fill_ifaddr(skb, ifa, 1317 NETLINK_CB(cb->skb).portid, 1318 cb->nlh->nlmsg_seq, 1319 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1320 rcu_read_unlock(); 1321 goto done; 1322 } 1323 } 1324cont: 1325 idx++; 1326 } 1327 rcu_read_unlock(); 1328 } 1329 1330done: 1331 cb->args[0] = h; 1332 cb->args[1] = idx; 1333 cb->args[2] = ip_idx; 1334 1335 return skb->len; 1336} 1337 1338static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1339 u32 portid) 1340{ 1341 struct sk_buff *skb; 1342 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1343 int err = -ENOBUFS; 1344 struct net *net; 1345 1346 net = dev_net(ifa->ifa_dev->dev); 1347 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1348 if (skb == NULL) 1349 goto errout; 1350 1351 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0); 1352 if (err < 0) { 1353 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1354 WARN_ON(err == -EMSGSIZE); 1355 kfree_skb(skb); 1356 goto errout; 1357 } 1358 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1359 return; 1360errout: 1361 if (err < 0) 1362 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1363} 1364 1365static size_t inet_get_link_af_size(const struct net_device *dev) 1366{ 1367 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1368 1369 if (!in_dev) 1370 return 0; 1371 1372 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */ 1373} 1374 1375static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 1376{ 1377 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr); 1378 struct nlattr *nla; 1379 int i; 1380 1381 if (!in_dev) 1382 return -ENODATA; 1383 1384 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4); 1385 if (nla == NULL) 1386 return -EMSGSIZE; 1387 1388 for (i = 0; i < IPV4_DEVCONF_MAX; i++) 1389 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i]; 1390 1391 return 0; 1392} 1393 1394static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = { 1395 [IFLA_INET_CONF] = { .type = NLA_NESTED }, 1396}; 1397 1398static int inet_validate_link_af(const struct net_device *dev, 1399 const struct nlattr *nla) 1400{ 1401 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1402 int err, rem; 1403 1404 if (dev && !__in_dev_get_rtnl(dev)) 1405 return -EAFNOSUPPORT; 1406 1407 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy); 1408 if (err < 0) 1409 return err; 1410 1411 if (tb[IFLA_INET_CONF]) { 1412 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) { 1413 int cfgid = nla_type(a); 1414 1415 if (nla_len(a) < 4) 1416 return -EINVAL; 1417 1418 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX) 1419 return -EINVAL; 1420 } 1421 } 1422 1423 return 0; 1424} 1425 1426static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla) 1427{ 1428 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1429 struct nlattr *a, *tb[IFLA_INET_MAX+1]; 1430 int rem; 1431 1432 if (!in_dev) 1433 return -EAFNOSUPPORT; 1434 1435 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0) 1436 BUG(); 1437 1438 if (tb[IFLA_INET_CONF]) { 1439 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) 1440 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a)); 1441 } 1442 1443 return 0; 1444} 1445 1446static int inet_netconf_msgsize_devconf(int type) 1447{ 1448 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 1449 + nla_total_size(4); /* NETCONFA_IFINDEX */ 1450 1451 /* type -1 is used for ALL */ 1452 if (type == -1 || type == NETCONFA_FORWARDING) 1453 size += nla_total_size(4); 1454 if (type == -1 || type == NETCONFA_RP_FILTER) 1455 size += nla_total_size(4); 1456 1457 return size; 1458} 1459 1460static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 1461 struct ipv4_devconf *devconf, u32 portid, 1462 u32 seq, int event, unsigned int flags, 1463 int type) 1464{ 1465 struct nlmsghdr *nlh; 1466 struct netconfmsg *ncm; 1467 1468 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 1469 flags); 1470 if (nlh == NULL) 1471 return -EMSGSIZE; 1472 1473 ncm = nlmsg_data(nlh); 1474 ncm->ncm_family = AF_INET; 1475 1476 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 1477 goto nla_put_failure; 1478 1479 /* type -1 is used for ALL */ 1480 if ((type == -1 || type == NETCONFA_FORWARDING) && 1481 nla_put_s32(skb, NETCONFA_FORWARDING, 1482 IPV4_DEVCONF(*devconf, FORWARDING)) < 0) 1483 goto nla_put_failure; 1484 if ((type == -1 || type == NETCONFA_RP_FILTER) && 1485 nla_put_s32(skb, NETCONFA_RP_FILTER, 1486 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0) 1487 goto nla_put_failure; 1488 1489 return nlmsg_end(skb, nlh); 1490 1491nla_put_failure: 1492 nlmsg_cancel(skb, nlh); 1493 return -EMSGSIZE; 1494} 1495 1496static void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 1497 struct ipv4_devconf *devconf) 1498{ 1499 struct sk_buff *skb; 1500 int err = -ENOBUFS; 1501 1502 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC); 1503 if (skb == NULL) 1504 goto errout; 1505 1506 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 1507 RTM_NEWNETCONF, 0, type); 1508 if (err < 0) { 1509 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1510 WARN_ON(err == -EMSGSIZE); 1511 kfree_skb(skb); 1512 goto errout; 1513 } 1514 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC); 1515 return; 1516errout: 1517 if (err < 0) 1518 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err); 1519} 1520 1521static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = { 1522 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 1523 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 1524 [NETCONFA_RP_FILTER] = { .len = sizeof(int) }, 1525}; 1526 1527static int inet_netconf_get_devconf(struct sk_buff *in_skb, 1528 struct nlmsghdr *nlh, 1529 void *arg) 1530{ 1531 struct net *net = sock_net(in_skb->sk); 1532 struct nlattr *tb[NETCONFA_MAX+1]; 1533 struct netconfmsg *ncm; 1534 struct sk_buff *skb; 1535 struct ipv4_devconf *devconf; 1536 struct in_device *in_dev; 1537 struct net_device *dev; 1538 int ifindex; 1539 int err; 1540 1541 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 1542 devconf_ipv4_policy); 1543 if (err < 0) 1544 goto errout; 1545 1546 err = EINVAL; 1547 if (!tb[NETCONFA_IFINDEX]) 1548 goto errout; 1549 1550 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 1551 switch (ifindex) { 1552 case NETCONFA_IFINDEX_ALL: 1553 devconf = net->ipv4.devconf_all; 1554 break; 1555 case NETCONFA_IFINDEX_DEFAULT: 1556 devconf = net->ipv4.devconf_dflt; 1557 break; 1558 default: 1559 dev = __dev_get_by_index(net, ifindex); 1560 if (dev == NULL) 1561 goto errout; 1562 in_dev = __in_dev_get_rtnl(dev); 1563 if (in_dev == NULL) 1564 goto errout; 1565 devconf = &in_dev->cnf; 1566 break; 1567 } 1568 1569 err = -ENOBUFS; 1570 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC); 1571 if (skb == NULL) 1572 goto errout; 1573 1574 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 1575 NETLINK_CB(in_skb).portid, 1576 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 1577 -1); 1578 if (err < 0) { 1579 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */ 1580 WARN_ON(err == -EMSGSIZE); 1581 kfree_skb(skb); 1582 goto errout; 1583 } 1584 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 1585errout: 1586 return err; 1587} 1588 1589#ifdef CONFIG_SYSCTL 1590 1591static void devinet_copy_dflt_conf(struct net *net, int i) 1592{ 1593 struct net_device *dev; 1594 1595 rcu_read_lock(); 1596 for_each_netdev_rcu(net, dev) { 1597 struct in_device *in_dev; 1598 1599 in_dev = __in_dev_get_rcu(dev); 1600 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1601 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1602 } 1603 rcu_read_unlock(); 1604} 1605 1606/* called with RTNL locked */ 1607static void inet_forward_change(struct net *net) 1608{ 1609 struct net_device *dev; 1610 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1611 1612 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1613 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1614 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1615 NETCONFA_IFINDEX_ALL, 1616 net->ipv4.devconf_all); 1617 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1618 NETCONFA_IFINDEX_DEFAULT, 1619 net->ipv4.devconf_dflt); 1620 1621 for_each_netdev(net, dev) { 1622 struct in_device *in_dev; 1623 if (on) 1624 dev_disable_lro(dev); 1625 rcu_read_lock(); 1626 in_dev = __in_dev_get_rcu(dev); 1627 if (in_dev) { 1628 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1629 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1630 dev->ifindex, &in_dev->cnf); 1631 } 1632 rcu_read_unlock(); 1633 } 1634} 1635 1636static int devinet_conf_proc(ctl_table *ctl, int write, 1637 void __user *buffer, 1638 size_t *lenp, loff_t *ppos) 1639{ 1640 int old_value = *(int *)ctl->data; 1641 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1642 int new_value = *(int *)ctl->data; 1643 1644 if (write) { 1645 struct ipv4_devconf *cnf = ctl->extra1; 1646 struct net *net = ctl->extra2; 1647 int i = (int *)ctl->data - cnf->data; 1648 1649 set_bit(i, cnf->state); 1650 1651 if (cnf == net->ipv4.devconf_dflt) 1652 devinet_copy_dflt_conf(net, i); 1653 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 || 1654 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1) 1655 if ((new_value == 0) && (old_value != 0)) 1656 rt_cache_flush(net); 1657 if (i == IPV4_DEVCONF_RP_FILTER - 1 && 1658 new_value != old_value) { 1659 int ifindex; 1660 1661 if (cnf == net->ipv4.devconf_dflt) 1662 ifindex = NETCONFA_IFINDEX_DEFAULT; 1663 else if (cnf == net->ipv4.devconf_all) 1664 ifindex = NETCONFA_IFINDEX_ALL; 1665 else { 1666 struct in_device *idev = 1667 container_of(cnf, struct in_device, 1668 cnf); 1669 ifindex = idev->dev->ifindex; 1670 } 1671 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER, 1672 ifindex, cnf); 1673 } 1674 } 1675 1676 return ret; 1677} 1678 1679static int devinet_sysctl_forward(ctl_table *ctl, int write, 1680 void __user *buffer, 1681 size_t *lenp, loff_t *ppos) 1682{ 1683 int *valp = ctl->data; 1684 int val = *valp; 1685 loff_t pos = *ppos; 1686 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1687 1688 if (write && *valp != val) { 1689 struct net *net = ctl->extra2; 1690 1691 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 1692 if (!rtnl_trylock()) { 1693 /* Restore the original values before restarting */ 1694 *valp = val; 1695 *ppos = pos; 1696 return restart_syscall(); 1697 } 1698 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 1699 inet_forward_change(net); 1700 } else { 1701 struct ipv4_devconf *cnf = ctl->extra1; 1702 struct in_device *idev = 1703 container_of(cnf, struct in_device, cnf); 1704 if (*valp) 1705 dev_disable_lro(idev->dev); 1706 inet_netconf_notify_devconf(net, 1707 NETCONFA_FORWARDING, 1708 idev->dev->ifindex, 1709 cnf); 1710 } 1711 rtnl_unlock(); 1712 rt_cache_flush(net); 1713 } else 1714 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING, 1715 NETCONFA_IFINDEX_DEFAULT, 1716 net->ipv4.devconf_dflt); 1717 } 1718 1719 return ret; 1720} 1721 1722static int ipv4_doint_and_flush(ctl_table *ctl, int write, 1723 void __user *buffer, 1724 size_t *lenp, loff_t *ppos) 1725{ 1726 int *valp = ctl->data; 1727 int val = *valp; 1728 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1729 struct net *net = ctl->extra2; 1730 1731 if (write && *valp != val) 1732 rt_cache_flush(net); 1733 1734 return ret; 1735} 1736 1737#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \ 1738 { \ 1739 .procname = name, \ 1740 .data = ipv4_devconf.data + \ 1741 IPV4_DEVCONF_ ## attr - 1, \ 1742 .maxlen = sizeof(int), \ 1743 .mode = mval, \ 1744 .proc_handler = proc, \ 1745 .extra1 = &ipv4_devconf, \ 1746 } 1747 1748#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 1749 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc) 1750 1751#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 1752 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc) 1753 1754#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \ 1755 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc) 1756 1757#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 1758 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush) 1759 1760static struct devinet_sysctl_table { 1761 struct ctl_table_header *sysctl_header; 1762 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX]; 1763} devinet_sysctl = { 1764 .devinet_vars = { 1765 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 1766 devinet_sysctl_forward), 1767 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 1768 1769 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 1770 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 1771 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 1772 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 1773 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 1774 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 1775 "accept_source_route"), 1776 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"), 1777 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"), 1778 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 1779 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 1780 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 1781 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 1782 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 1783 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 1784 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 1785 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 1786 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 1787 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 1788 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"), 1789 1790 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 1791 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 1792 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, 1793 "force_igmp_version"), 1794 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 1795 "promote_secondaries"), 1796 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET, 1797 "route_localnet"), 1798 }, 1799}; 1800 1801static int __devinet_sysctl_register(struct net *net, char *dev_name, 1802 struct ipv4_devconf *p) 1803{ 1804 int i; 1805 struct devinet_sysctl_table *t; 1806 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ]; 1807 1808 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 1809 if (!t) 1810 goto out; 1811 1812 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 1813 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 1814 t->devinet_vars[i].extra1 = p; 1815 t->devinet_vars[i].extra2 = net; 1816 } 1817 1818 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name); 1819 1820 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars); 1821 if (!t->sysctl_header) 1822 goto free; 1823 1824 p->sysctl = t; 1825 return 0; 1826 1827free: 1828 kfree(t); 1829out: 1830 return -ENOBUFS; 1831} 1832 1833static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 1834{ 1835 struct devinet_sysctl_table *t = cnf->sysctl; 1836 1837 if (t == NULL) 1838 return; 1839 1840 cnf->sysctl = NULL; 1841 unregister_net_sysctl_table(t->sysctl_header); 1842 kfree(t); 1843} 1844 1845static void devinet_sysctl_register(struct in_device *idev) 1846{ 1847 neigh_sysctl_register(idev->dev, idev->arp_parms, "ipv4", NULL); 1848 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 1849 &idev->cnf); 1850} 1851 1852static void devinet_sysctl_unregister(struct in_device *idev) 1853{ 1854 __devinet_sysctl_unregister(&idev->cnf); 1855 neigh_sysctl_unregister(idev->arp_parms); 1856} 1857 1858static struct ctl_table ctl_forward_entry[] = { 1859 { 1860 .procname = "ip_forward", 1861 .data = &ipv4_devconf.data[ 1862 IPV4_DEVCONF_FORWARDING - 1], 1863 .maxlen = sizeof(int), 1864 .mode = 0644, 1865 .proc_handler = devinet_sysctl_forward, 1866 .extra1 = &ipv4_devconf, 1867 .extra2 = &init_net, 1868 }, 1869 { }, 1870}; 1871#endif 1872 1873static __net_init int devinet_init_net(struct net *net) 1874{ 1875 int err; 1876 struct ipv4_devconf *all, *dflt; 1877#ifdef CONFIG_SYSCTL 1878 struct ctl_table *tbl = ctl_forward_entry; 1879 struct ctl_table_header *forw_hdr; 1880#endif 1881 1882 err = -ENOMEM; 1883 all = &ipv4_devconf; 1884 dflt = &ipv4_devconf_dflt; 1885 1886 if (!net_eq(net, &init_net)) { 1887 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 1888 if (all == NULL) 1889 goto err_alloc_all; 1890 1891 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 1892 if (dflt == NULL) 1893 goto err_alloc_dflt; 1894 1895#ifdef CONFIG_SYSCTL 1896 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 1897 if (tbl == NULL) 1898 goto err_alloc_ctl; 1899 1900 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1]; 1901 tbl[0].extra1 = all; 1902 tbl[0].extra2 = net; 1903#endif 1904 } 1905 1906#ifdef CONFIG_SYSCTL 1907 err = __devinet_sysctl_register(net, "all", all); 1908 if (err < 0) 1909 goto err_reg_all; 1910 1911 err = __devinet_sysctl_register(net, "default", dflt); 1912 if (err < 0) 1913 goto err_reg_dflt; 1914 1915 err = -ENOMEM; 1916 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl); 1917 if (forw_hdr == NULL) 1918 goto err_reg_ctl; 1919 net->ipv4.forw_hdr = forw_hdr; 1920#endif 1921 1922 net->ipv4.devconf_all = all; 1923 net->ipv4.devconf_dflt = dflt; 1924 return 0; 1925 1926#ifdef CONFIG_SYSCTL 1927err_reg_ctl: 1928 __devinet_sysctl_unregister(dflt); 1929err_reg_dflt: 1930 __devinet_sysctl_unregister(all); 1931err_reg_all: 1932 if (tbl != ctl_forward_entry) 1933 kfree(tbl); 1934err_alloc_ctl: 1935#endif 1936 if (dflt != &ipv4_devconf_dflt) 1937 kfree(dflt); 1938err_alloc_dflt: 1939 if (all != &ipv4_devconf) 1940 kfree(all); 1941err_alloc_all: 1942 return err; 1943} 1944 1945static __net_exit void devinet_exit_net(struct net *net) 1946{ 1947#ifdef CONFIG_SYSCTL 1948 struct ctl_table *tbl; 1949 1950 tbl = net->ipv4.forw_hdr->ctl_table_arg; 1951 unregister_net_sysctl_table(net->ipv4.forw_hdr); 1952 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 1953 __devinet_sysctl_unregister(net->ipv4.devconf_all); 1954 kfree(tbl); 1955#endif 1956 kfree(net->ipv4.devconf_dflt); 1957 kfree(net->ipv4.devconf_all); 1958} 1959 1960static __net_initdata struct pernet_operations devinet_ops = { 1961 .init = devinet_init_net, 1962 .exit = devinet_exit_net, 1963}; 1964 1965static struct rtnl_af_ops inet_af_ops = { 1966 .family = AF_INET, 1967 .fill_link_af = inet_fill_link_af, 1968 .get_link_af_size = inet_get_link_af_size, 1969 .validate_link_af = inet_validate_link_af, 1970 .set_link_af = inet_set_link_af, 1971}; 1972 1973void __init devinet_init(void) 1974{ 1975 int i; 1976 1977 for (i = 0; i < IN4_ADDR_HSIZE; i++) 1978 INIT_HLIST_HEAD(&inet_addr_lst[i]); 1979 1980 register_pernet_subsys(&devinet_ops); 1981 1982 register_gifconf(PF_INET, inet_gifconf); 1983 register_netdevice_notifier(&ip_netdev_notifier); 1984 1985 rtnl_af_register(&inet_af_ops); 1986 1987 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL); 1988 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL); 1989 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL); 1990 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf, 1991 NULL, NULL); 1992} 1993 1994