1 /* 2 * NET3 IP device support routines. 3 * 4 * Version: $Id: devinet.c,v 1.44 2001/10/31 21:55:54 davem Exp $ 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 * 11 * Derived from the IP parts of dev.c 1.0.19 12 * Authors: Ross Biro 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 14 * Mark Evans, <evansmp@uhura.aston.ac.uk> 15 * 16 * Additional Authors: 17 * Alan Cox, <gw4pts@gw4pts.ampr.org> 18 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 19 * 20 * Changes: 21 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr 22 * lists. 23 * Cyrus Durgin: updated for kmod 24 * Matthias Andree: in devinet_ioctl, compare label and 25 * address (4.4BSD alias style support), 26 * fall back to comparing just the label 27 * if no match found. 28 */ 29 30 31 #include <asm/uaccess.h> 32 #include <asm/system.h> 33 #include <linux/bitops.h> 34 #include <linux/capability.h> 35 #include <linux/module.h> 36 #include <linux/types.h> 37 #include <linux/kernel.h> 38 #include <linux/string.h> 39 #include <linux/mm.h> 40 #include <linux/socket.h> 41 #include <linux/sockios.h> 42 #include <linux/in.h> 43 #include <linux/errno.h> 44 #include <linux/interrupt.h> 45 #include <linux/if_addr.h> 46 #include <linux/if_ether.h> 47 #include <linux/inet.h> 48 #include <linux/netdevice.h> 49 #include <linux/etherdevice.h> 50 #include <linux/skbuff.h> 51 #include <linux/rtnetlink.h> 52 #include <linux/init.h> 53 #include <linux/notifier.h> 54 #include <linux/inetdevice.h> 55 #include <linux/igmp.h> 56 #ifdef CONFIG_SYSCTL 57 #include <linux/sysctl.h> 58 #endif 59 #include <linux/kmod.h> 60 61 #include <net/arp.h> 62 #include <net/ip.h> 63 #include <net/route.h> 64 #include <net/ip_fib.h> 65 #include <net/netlink.h> 66 67 struct ipv4_devconf ipv4_devconf = { 68 .accept_redirects = 1, 69 .send_redirects = 1, 70 .secure_redirects = 1, 71 .shared_media = 1, 72 }; 73 74 static struct ipv4_devconf ipv4_devconf_dflt = { 75 .accept_redirects = 1, 76 .send_redirects = 1, 77 .secure_redirects = 1, 78 .shared_media = 1, 79 .accept_source_route = 1, 80 }; 81 82 static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = { 83 [IFA_LOCAL] = { .type = NLA_U32 }, 84 [IFA_ADDRESS] = { .type = NLA_U32 }, 85 [IFA_BROADCAST] = { .type = NLA_U32 }, 86 [IFA_ANYCAST] = { .type = NLA_U32 }, 87 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 88 }; 89 90 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 91 92 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 93 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 94 int destroy); 95 #ifdef CONFIG_SYSCTL 96 static void devinet_sysctl_register(struct in_device *in_dev, 97 struct ipv4_devconf *p); 98 static void devinet_sysctl_unregister(struct ipv4_devconf *p); 99 #endif 100 101 /* Locks all the inet devices. */ 102 103 static struct in_ifaddr *inet_alloc_ifa(void) 104 { 105 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); 106 107 if (ifa) { 108 INIT_RCU_HEAD(&ifa->rcu_head); 109 } 110 111 return ifa; 112 } 113 114 static void inet_rcu_free_ifa(struct rcu_head *head) 115 { 116 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 117 if (ifa->ifa_dev) 118 in_dev_put(ifa->ifa_dev); 119 kfree(ifa); 120 } 121 122 static inline void inet_free_ifa(struct in_ifaddr *ifa) 123 { 124 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 125 } 126 127 void in_dev_finish_destroy(struct in_device *idev) 128 { 129 struct net_device *dev = idev->dev; 130 131 BUG_TRAP(!idev->ifa_list); 132 BUG_TRAP(!idev->mc_list); 133 #ifdef NET_REFCNT_DEBUG 134 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", 135 idev, dev ? dev->name : "NIL"); 136 #endif 137 dev_put(dev); 138 if (!idev->dead) 139 printk("Freeing alive in_device %p\n", idev); 140 else { 141 kfree(idev); 142 } 143 } 144 145 struct in_device *inetdev_init(struct net_device *dev) 146 { 147 struct in_device *in_dev; 148 149 ASSERT_RTNL(); 150 151 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 152 if (!in_dev) 153 goto out; 154 INIT_RCU_HEAD(&in_dev->rcu_head); 155 memcpy(&in_dev->cnf, &ipv4_devconf_dflt, sizeof(in_dev->cnf)); 156 in_dev->cnf.sysctl = NULL; 157 in_dev->dev = dev; 158 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) 159 goto out_kfree; 160 /* Reference in_dev->dev */ 161 dev_hold(dev); 162 #ifdef CONFIG_SYSCTL 163 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, 164 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 165 #endif 166 167 /* Account for reference dev->ip_ptr (below) */ 168 in_dev_hold(in_dev); 169 170 #ifdef CONFIG_SYSCTL 171 devinet_sysctl_register(in_dev, &in_dev->cnf); 172 #endif 173 ip_mc_init_dev(in_dev); 174 if (dev->flags & IFF_UP) 175 ip_mc_up(in_dev); 176 177 /* we can receive as soon as ip_ptr is set -- do this last */ 178 rcu_assign_pointer(dev->ip_ptr, in_dev); 179 out: 180 return in_dev; 181 out_kfree: 182 kfree(in_dev); 183 in_dev = NULL; 184 goto out; 185 } 186 187 static void in_dev_rcu_put(struct rcu_head *head) 188 { 189 struct in_device *idev = container_of(head, struct in_device, rcu_head); 190 in_dev_put(idev); 191 } 192 193 static void inetdev_destroy(struct in_device *in_dev) 194 { 195 struct in_ifaddr *ifa; 196 struct net_device *dev; 197 198 ASSERT_RTNL(); 199 200 dev = in_dev->dev; 201 if (dev == &loopback_dev) 202 return; 203 204 in_dev->dead = 1; 205 206 ip_mc_destroy_dev(in_dev); 207 208 while ((ifa = in_dev->ifa_list) != NULL) { 209 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 210 inet_free_ifa(ifa); 211 } 212 213 #ifdef CONFIG_SYSCTL 214 devinet_sysctl_unregister(&in_dev->cnf); 215 #endif 216 217 dev->ip_ptr = NULL; 218 219 #ifdef CONFIG_SYSCTL 220 neigh_sysctl_unregister(in_dev->arp_parms); 221 #endif 222 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 223 arp_ifdown(dev); 224 225 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 226 } 227 228 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 229 { 230 rcu_read_lock(); 231 for_primary_ifa(in_dev) { 232 if (inet_ifa_match(a, ifa)) { 233 if (!b || inet_ifa_match(b, ifa)) { 234 rcu_read_unlock(); 235 return 1; 236 } 237 } 238 } endfor_ifa(in_dev); 239 rcu_read_unlock(); 240 return 0; 241 } 242 243 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 244 int destroy, struct nlmsghdr *nlh, u32 pid) 245 { 246 struct in_ifaddr *promote = NULL; 247 struct in_ifaddr *ifa, *ifa1 = *ifap; 248 struct in_ifaddr *last_prim = in_dev->ifa_list; 249 struct in_ifaddr *prev_prom = NULL; 250 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 251 252 ASSERT_RTNL(); 253 254 /* 1. Deleting primary ifaddr forces deletion all secondaries 255 * unless alias promotion is set 256 **/ 257 258 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 259 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 260 261 while ((ifa = *ifap1) != NULL) { 262 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 263 ifa1->ifa_scope <= ifa->ifa_scope) 264 last_prim = ifa; 265 266 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 267 ifa1->ifa_mask != ifa->ifa_mask || 268 !inet_ifa_match(ifa1->ifa_address, ifa)) { 269 ifap1 = &ifa->ifa_next; 270 prev_prom = ifa; 271 continue; 272 } 273 274 if (!do_promote) { 275 *ifap1 = ifa->ifa_next; 276 277 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); 278 blocking_notifier_call_chain(&inetaddr_chain, 279 NETDEV_DOWN, ifa); 280 inet_free_ifa(ifa); 281 } else { 282 promote = ifa; 283 break; 284 } 285 } 286 } 287 288 /* 2. Unlink it */ 289 290 *ifap = ifa1->ifa_next; 291 292 /* 3. Announce address deletion */ 293 294 /* Send message first, then call notifier. 295 At first sight, FIB update triggered by notifier 296 will refer to already deleted ifaddr, that could confuse 297 netlink listeners. It is not true: look, gated sees 298 that route deleted and if it still thinks that ifaddr 299 is valid, it will try to restore deleted routes... Grr. 300 So that, this order is correct. 301 */ 302 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); 303 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 304 305 if (promote) { 306 307 if (prev_prom) { 308 prev_prom->ifa_next = promote->ifa_next; 309 promote->ifa_next = last_prim->ifa_next; 310 last_prim->ifa_next = promote; 311 } 312 313 promote->ifa_flags &= ~IFA_F_SECONDARY; 314 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); 315 blocking_notifier_call_chain(&inetaddr_chain, 316 NETDEV_UP, promote); 317 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { 318 if (ifa1->ifa_mask != ifa->ifa_mask || 319 !inet_ifa_match(ifa1->ifa_address, ifa)) 320 continue; 321 fib_add_ifaddr(ifa); 322 } 323 324 } 325 if (destroy) { 326 inet_free_ifa(ifa1); 327 328 if (!in_dev->ifa_list) 329 inetdev_destroy(in_dev); 330 } 331 } 332 333 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 334 int destroy) 335 { 336 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 337 } 338 339 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 340 u32 pid) 341 { 342 struct in_device *in_dev = ifa->ifa_dev; 343 struct in_ifaddr *ifa1, **ifap, **last_primary; 344 345 ASSERT_RTNL(); 346 347 if (!ifa->ifa_local) { 348 inet_free_ifa(ifa); 349 return 0; 350 } 351 352 ifa->ifa_flags &= ~IFA_F_SECONDARY; 353 last_primary = &in_dev->ifa_list; 354 355 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 356 ifap = &ifa1->ifa_next) { 357 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 358 ifa->ifa_scope <= ifa1->ifa_scope) 359 last_primary = &ifa1->ifa_next; 360 if (ifa1->ifa_mask == ifa->ifa_mask && 361 inet_ifa_match(ifa1->ifa_address, ifa)) { 362 if (ifa1->ifa_local == ifa->ifa_local) { 363 inet_free_ifa(ifa); 364 return -EEXIST; 365 } 366 if (ifa1->ifa_scope != ifa->ifa_scope) { 367 inet_free_ifa(ifa); 368 return -EINVAL; 369 } 370 ifa->ifa_flags |= IFA_F_SECONDARY; 371 } 372 } 373 374 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 375 net_srandom(ifa->ifa_local); 376 ifap = last_primary; 377 } 378 379 ifa->ifa_next = *ifap; 380 *ifap = ifa; 381 382 /* Send message first, then call notifier. 383 Notifier will trigger FIB update, so that 384 listeners of netlink will know about new ifaddr */ 385 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); 386 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 387 388 return 0; 389 } 390 391 static int inet_insert_ifa(struct in_ifaddr *ifa) 392 { 393 return __inet_insert_ifa(ifa, NULL, 0); 394 } 395 396 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 397 { 398 struct in_device *in_dev = __in_dev_get_rtnl(dev); 399 400 ASSERT_RTNL(); 401 402 if (!in_dev) { 403 in_dev = inetdev_init(dev); 404 if (!in_dev) { 405 inet_free_ifa(ifa); 406 return -ENOBUFS; 407 } 408 } 409 if (ifa->ifa_dev != in_dev) { 410 BUG_TRAP(!ifa->ifa_dev); 411 in_dev_hold(in_dev); 412 ifa->ifa_dev = in_dev; 413 } 414 if (LOOPBACK(ifa->ifa_local)) 415 ifa->ifa_scope = RT_SCOPE_HOST; 416 return inet_insert_ifa(ifa); 417 } 418 419 struct in_device *inetdev_by_index(int ifindex) 420 { 421 struct net_device *dev; 422 struct in_device *in_dev = NULL; 423 read_lock(&dev_base_lock); 424 dev = __dev_get_by_index(ifindex); 425 if (dev) 426 in_dev = in_dev_get(dev); 427 read_unlock(&dev_base_lock); 428 return in_dev; 429 } 430 431 /* Called only from RTNL semaphored context. No locks. */ 432 433 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 434 __be32 mask) 435 { 436 ASSERT_RTNL(); 437 438 for_primary_ifa(in_dev) { 439 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 440 return ifa; 441 } endfor_ifa(in_dev); 442 return NULL; 443 } 444 445 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 446 { 447 struct nlattr *tb[IFA_MAX+1]; 448 struct in_device *in_dev; 449 struct ifaddrmsg *ifm; 450 struct in_ifaddr *ifa, **ifap; 451 int err = -EINVAL; 452 453 ASSERT_RTNL(); 454 455 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 456 if (err < 0) 457 goto errout; 458 459 ifm = nlmsg_data(nlh); 460 in_dev = inetdev_by_index(ifm->ifa_index); 461 if (in_dev == NULL) { 462 err = -ENODEV; 463 goto errout; 464 } 465 466 __in_dev_put(in_dev); 467 468 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 469 ifap = &ifa->ifa_next) { 470 if (tb[IFA_LOCAL] && 471 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 472 continue; 473 474 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 475 continue; 476 477 if (tb[IFA_ADDRESS] && 478 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 479 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 480 continue; 481 482 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); 483 return 0; 484 } 485 486 err = -EADDRNOTAVAIL; 487 errout: 488 return err; 489 } 490 491 static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh) 492 { 493 struct nlattr *tb[IFA_MAX+1]; 494 struct in_ifaddr *ifa; 495 struct ifaddrmsg *ifm; 496 struct net_device *dev; 497 struct in_device *in_dev; 498 int err = -EINVAL; 499 500 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 501 if (err < 0) 502 goto errout; 503 504 ifm = nlmsg_data(nlh); 505 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 506 goto errout; 507 508 dev = __dev_get_by_index(ifm->ifa_index); 509 if (dev == NULL) { 510 err = -ENODEV; 511 goto errout; 512 } 513 514 in_dev = __in_dev_get_rtnl(dev); 515 if (in_dev == NULL) { 516 in_dev = inetdev_init(dev); 517 if (in_dev == NULL) { 518 err = -ENOBUFS; 519 goto errout; 520 } 521 } 522 523 ifa = inet_alloc_ifa(); 524 if (ifa == NULL) { 525 /* 526 * A potential indev allocation can be left alive, it stays 527 * assigned to its device and is destroy with it. 528 */ 529 err = -ENOBUFS; 530 goto errout; 531 } 532 533 in_dev_hold(in_dev); 534 535 if (tb[IFA_ADDRESS] == NULL) 536 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 537 538 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 539 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 540 ifa->ifa_flags = ifm->ifa_flags; 541 ifa->ifa_scope = ifm->ifa_scope; 542 ifa->ifa_dev = in_dev; 543 544 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 545 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 546 547 if (tb[IFA_BROADCAST]) 548 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 549 550 if (tb[IFA_ANYCAST]) 551 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); 552 553 if (tb[IFA_LABEL]) 554 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 555 else 556 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 557 558 return ifa; 559 560 errout: 561 return ERR_PTR(err); 562 } 563 564 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 565 { 566 struct in_ifaddr *ifa; 567 568 ASSERT_RTNL(); 569 570 ifa = rtm_to_ifaddr(nlh); 571 if (IS_ERR(ifa)) 572 return PTR_ERR(ifa); 573 574 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); 575 } 576 577 /* 578 * Determine a default network mask, based on the IP address. 579 */ 580 581 static __inline__ int inet_abc_len(__be32 addr) 582 { 583 int rc = -1; /* Something else, probably a multicast. */ 584 585 if (ZERONET(addr)) 586 rc = 0; 587 else { 588 __u32 haddr = ntohl(addr); 589 590 if (IN_CLASSA(haddr)) 591 rc = 8; 592 else if (IN_CLASSB(haddr)) 593 rc = 16; 594 else if (IN_CLASSC(haddr)) 595 rc = 24; 596 } 597 598 return rc; 599 } 600 601 602 int devinet_ioctl(unsigned int cmd, void __user *arg) 603 { 604 struct ifreq ifr; 605 struct sockaddr_in sin_orig; 606 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 607 struct in_device *in_dev; 608 struct in_ifaddr **ifap = NULL; 609 struct in_ifaddr *ifa = NULL; 610 struct net_device *dev; 611 char *colon; 612 int ret = -EFAULT; 613 int tryaddrmatch = 0; 614 615 /* 616 * Fetch the caller's info block into kernel space 617 */ 618 619 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 620 goto out; 621 ifr.ifr_name[IFNAMSIZ - 1] = 0; 622 623 /* save original address for comparison */ 624 memcpy(&sin_orig, sin, sizeof(*sin)); 625 626 colon = strchr(ifr.ifr_name, ':'); 627 if (colon) 628 *colon = 0; 629 630 #ifdef CONFIG_KMOD 631 dev_load(ifr.ifr_name); 632 #endif 633 634 switch(cmd) { 635 case SIOCGIFADDR: /* Get interface address */ 636 case SIOCGIFBRDADDR: /* Get the broadcast address */ 637 case SIOCGIFDSTADDR: /* Get the destination address */ 638 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 639 /* Note that these ioctls will not sleep, 640 so that we do not impose a lock. 641 One day we will be forced to put shlock here (I mean SMP) 642 */ 643 tryaddrmatch = (sin_orig.sin_family == AF_INET); 644 memset(sin, 0, sizeof(*sin)); 645 sin->sin_family = AF_INET; 646 break; 647 648 case SIOCSIFFLAGS: 649 ret = -EACCES; 650 if (!capable(CAP_NET_ADMIN)) 651 goto out; 652 break; 653 case SIOCSIFADDR: /* Set interface address (and family) */ 654 case SIOCSIFBRDADDR: /* Set the broadcast address */ 655 case SIOCSIFDSTADDR: /* Set the destination address */ 656 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 657 ret = -EACCES; 658 if (!capable(CAP_NET_ADMIN)) 659 goto out; 660 ret = -EINVAL; 661 if (sin->sin_family != AF_INET) 662 goto out; 663 break; 664 default: 665 ret = -EINVAL; 666 goto out; 667 } 668 669 rtnl_lock(); 670 671 ret = -ENODEV; 672 if ((dev = __dev_get_by_name(ifr.ifr_name)) == NULL) 673 goto done; 674 675 if (colon) 676 *colon = ':'; 677 678 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { 679 if (tryaddrmatch) { 680 /* Matthias Andree */ 681 /* compare label and address (4.4BSD style) */ 682 /* note: we only do this for a limited set of ioctls 683 and only if the original address family was AF_INET. 684 This is checked above. */ 685 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 686 ifap = &ifa->ifa_next) { 687 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 688 sin_orig.sin_addr.s_addr == 689 ifa->ifa_address) { 690 break; /* found */ 691 } 692 } 693 } 694 /* we didn't get a match, maybe the application is 695 4.3BSD-style and passed in junk so we fall back to 696 comparing just the label */ 697 if (!ifa) { 698 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 699 ifap = &ifa->ifa_next) 700 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 701 break; 702 } 703 } 704 705 ret = -EADDRNOTAVAIL; 706 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 707 goto done; 708 709 switch(cmd) { 710 case SIOCGIFADDR: /* Get interface address */ 711 sin->sin_addr.s_addr = ifa->ifa_local; 712 goto rarok; 713 714 case SIOCGIFBRDADDR: /* Get the broadcast address */ 715 sin->sin_addr.s_addr = ifa->ifa_broadcast; 716 goto rarok; 717 718 case SIOCGIFDSTADDR: /* Get the destination address */ 719 sin->sin_addr.s_addr = ifa->ifa_address; 720 goto rarok; 721 722 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 723 sin->sin_addr.s_addr = ifa->ifa_mask; 724 goto rarok; 725 726 case SIOCSIFFLAGS: 727 if (colon) { 728 ret = -EADDRNOTAVAIL; 729 if (!ifa) 730 break; 731 ret = 0; 732 if (!(ifr.ifr_flags & IFF_UP)) 733 inet_del_ifa(in_dev, ifap, 1); 734 break; 735 } 736 ret = dev_change_flags(dev, ifr.ifr_flags); 737 break; 738 739 case SIOCSIFADDR: /* Set interface address (and family) */ 740 ret = -EINVAL; 741 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 742 break; 743 744 if (!ifa) { 745 ret = -ENOBUFS; 746 if ((ifa = inet_alloc_ifa()) == NULL) 747 break; 748 if (colon) 749 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 750 else 751 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 752 } else { 753 ret = 0; 754 if (ifa->ifa_local == sin->sin_addr.s_addr) 755 break; 756 inet_del_ifa(in_dev, ifap, 0); 757 ifa->ifa_broadcast = 0; 758 ifa->ifa_anycast = 0; 759 } 760 761 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 762 763 if (!(dev->flags & IFF_POINTOPOINT)) { 764 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 765 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 766 if ((dev->flags & IFF_BROADCAST) && 767 ifa->ifa_prefixlen < 31) 768 ifa->ifa_broadcast = ifa->ifa_address | 769 ~ifa->ifa_mask; 770 } else { 771 ifa->ifa_prefixlen = 32; 772 ifa->ifa_mask = inet_make_mask(32); 773 } 774 ret = inet_set_ifa(dev, ifa); 775 break; 776 777 case SIOCSIFBRDADDR: /* Set the broadcast address */ 778 ret = 0; 779 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 780 inet_del_ifa(in_dev, ifap, 0); 781 ifa->ifa_broadcast = sin->sin_addr.s_addr; 782 inet_insert_ifa(ifa); 783 } 784 break; 785 786 case SIOCSIFDSTADDR: /* Set the destination address */ 787 ret = 0; 788 if (ifa->ifa_address == sin->sin_addr.s_addr) 789 break; 790 ret = -EINVAL; 791 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 792 break; 793 ret = 0; 794 inet_del_ifa(in_dev, ifap, 0); 795 ifa->ifa_address = sin->sin_addr.s_addr; 796 inet_insert_ifa(ifa); 797 break; 798 799 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 800 801 /* 802 * The mask we set must be legal. 803 */ 804 ret = -EINVAL; 805 if (bad_mask(sin->sin_addr.s_addr, 0)) 806 break; 807 ret = 0; 808 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 809 __be32 old_mask = ifa->ifa_mask; 810 inet_del_ifa(in_dev, ifap, 0); 811 ifa->ifa_mask = sin->sin_addr.s_addr; 812 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 813 814 /* See if current broadcast address matches 815 * with current netmask, then recalculate 816 * the broadcast address. Otherwise it's a 817 * funny address, so don't touch it since 818 * the user seems to know what (s)he's doing... 819 */ 820 if ((dev->flags & IFF_BROADCAST) && 821 (ifa->ifa_prefixlen < 31) && 822 (ifa->ifa_broadcast == 823 (ifa->ifa_local|~old_mask))) { 824 ifa->ifa_broadcast = (ifa->ifa_local | 825 ~sin->sin_addr.s_addr); 826 } 827 inet_insert_ifa(ifa); 828 } 829 break; 830 } 831 done: 832 rtnl_unlock(); 833 out: 834 return ret; 835 rarok: 836 rtnl_unlock(); 837 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 838 goto out; 839 } 840 841 static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 842 { 843 struct in_device *in_dev = __in_dev_get_rtnl(dev); 844 struct in_ifaddr *ifa; 845 struct ifreq ifr; 846 int done = 0; 847 848 if (!in_dev || (ifa = in_dev->ifa_list) == NULL) 849 goto out; 850 851 for (; ifa; ifa = ifa->ifa_next) { 852 if (!buf) { 853 done += sizeof(ifr); 854 continue; 855 } 856 if (len < (int) sizeof(ifr)) 857 break; 858 memset(&ifr, 0, sizeof(struct ifreq)); 859 if (ifa->ifa_label) 860 strcpy(ifr.ifr_name, ifa->ifa_label); 861 else 862 strcpy(ifr.ifr_name, dev->name); 863 864 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 865 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 866 ifa->ifa_local; 867 868 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 869 done = -EFAULT; 870 break; 871 } 872 buf += sizeof(struct ifreq); 873 len -= sizeof(struct ifreq); 874 done += sizeof(struct ifreq); 875 } 876 out: 877 return done; 878 } 879 880 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 881 { 882 __be32 addr = 0; 883 struct in_device *in_dev; 884 885 rcu_read_lock(); 886 in_dev = __in_dev_get_rcu(dev); 887 if (!in_dev) 888 goto no_in_dev; 889 890 for_primary_ifa(in_dev) { 891 if (ifa->ifa_scope > scope) 892 continue; 893 if (!dst || inet_ifa_match(dst, ifa)) { 894 addr = ifa->ifa_local; 895 break; 896 } 897 if (!addr) 898 addr = ifa->ifa_local; 899 } endfor_ifa(in_dev); 900 no_in_dev: 901 rcu_read_unlock(); 902 903 if (addr) 904 goto out; 905 906 /* Not loopback addresses on loopback should be preferred 907 in this case. It is importnat that lo is the first interface 908 in dev_base list. 909 */ 910 read_lock(&dev_base_lock); 911 rcu_read_lock(); 912 for (dev = dev_base; dev; dev = dev->next) { 913 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) 914 continue; 915 916 for_primary_ifa(in_dev) { 917 if (ifa->ifa_scope != RT_SCOPE_LINK && 918 ifa->ifa_scope <= scope) { 919 addr = ifa->ifa_local; 920 goto out_unlock_both; 921 } 922 } endfor_ifa(in_dev); 923 } 924 out_unlock_both: 925 read_unlock(&dev_base_lock); 926 rcu_read_unlock(); 927 out: 928 return addr; 929 } 930 931 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 932 __be32 local, int scope) 933 { 934 int same = 0; 935 __be32 addr = 0; 936 937 for_ifa(in_dev) { 938 if (!addr && 939 (local == ifa->ifa_local || !local) && 940 ifa->ifa_scope <= scope) { 941 addr = ifa->ifa_local; 942 if (same) 943 break; 944 } 945 if (!same) { 946 same = (!local || inet_ifa_match(local, ifa)) && 947 (!dst || inet_ifa_match(dst, ifa)); 948 if (same && addr) { 949 if (local || !dst) 950 break; 951 /* Is the selected addr into dst subnet? */ 952 if (inet_ifa_match(addr, ifa)) 953 break; 954 /* No, then can we use new local src? */ 955 if (ifa->ifa_scope <= scope) { 956 addr = ifa->ifa_local; 957 break; 958 } 959 /* search for large dst subnet for addr */ 960 same = 0; 961 } 962 } 963 } endfor_ifa(in_dev); 964 965 return same? addr : 0; 966 } 967 968 /* 969 * Confirm that local IP address exists using wildcards: 970 * - dev: only on this interface, 0=any interface 971 * - dst: only in the same subnet as dst, 0=any dst 972 * - local: address, 0=autoselect the local address 973 * - scope: maximum allowed scope value for the local address 974 */ 975 __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope) 976 { 977 __be32 addr = 0; 978 struct in_device *in_dev; 979 980 if (dev) { 981 rcu_read_lock(); 982 if ((in_dev = __in_dev_get_rcu(dev))) 983 addr = confirm_addr_indev(in_dev, dst, local, scope); 984 rcu_read_unlock(); 985 986 return addr; 987 } 988 989 read_lock(&dev_base_lock); 990 rcu_read_lock(); 991 for (dev = dev_base; dev; dev = dev->next) { 992 if ((in_dev = __in_dev_get_rcu(dev))) { 993 addr = confirm_addr_indev(in_dev, dst, local, scope); 994 if (addr) 995 break; 996 } 997 } 998 rcu_read_unlock(); 999 read_unlock(&dev_base_lock); 1000 1001 return addr; 1002 } 1003 1004 /* 1005 * Device notifier 1006 */ 1007 1008 int register_inetaddr_notifier(struct notifier_block *nb) 1009 { 1010 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1011 } 1012 1013 int unregister_inetaddr_notifier(struct notifier_block *nb) 1014 { 1015 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1016 } 1017 1018 /* Rename ifa_labels for a device name change. Make some effort to preserve existing 1019 * alias numbering and to create unique labels if possible. 1020 */ 1021 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1022 { 1023 struct in_ifaddr *ifa; 1024 int named = 0; 1025 1026 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1027 char old[IFNAMSIZ], *dot; 1028 1029 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1030 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1031 if (named++ == 0) 1032 continue; 1033 dot = strchr(ifa->ifa_label, ':'); 1034 if (dot == NULL) { 1035 sprintf(old, ":%d", named); 1036 dot = old; 1037 } 1038 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { 1039 strcat(ifa->ifa_label, dot); 1040 } else { 1041 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1042 } 1043 } 1044 } 1045 1046 /* Called only under RTNL semaphore */ 1047 1048 static int inetdev_event(struct notifier_block *this, unsigned long event, 1049 void *ptr) 1050 { 1051 struct net_device *dev = ptr; 1052 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1053 1054 ASSERT_RTNL(); 1055 1056 if (!in_dev) { 1057 if (event == NETDEV_REGISTER && dev == &loopback_dev) { 1058 in_dev = inetdev_init(dev); 1059 if (!in_dev) 1060 panic("devinet: Failed to create loopback\n"); 1061 in_dev->cnf.no_xfrm = 1; 1062 in_dev->cnf.no_policy = 1; 1063 } 1064 goto out; 1065 } 1066 1067 switch (event) { 1068 case NETDEV_REGISTER: 1069 printk(KERN_DEBUG "inetdev_event: bug\n"); 1070 dev->ip_ptr = NULL; 1071 break; 1072 case NETDEV_UP: 1073 if (dev->mtu < 68) 1074 break; 1075 if (dev == &loopback_dev) { 1076 struct in_ifaddr *ifa; 1077 if ((ifa = inet_alloc_ifa()) != NULL) { 1078 ifa->ifa_local = 1079 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1080 ifa->ifa_prefixlen = 8; 1081 ifa->ifa_mask = inet_make_mask(8); 1082 in_dev_hold(in_dev); 1083 ifa->ifa_dev = in_dev; 1084 ifa->ifa_scope = RT_SCOPE_HOST; 1085 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1086 inet_insert_ifa(ifa); 1087 } 1088 } 1089 ip_mc_up(in_dev); 1090 break; 1091 case NETDEV_DOWN: 1092 ip_mc_down(in_dev); 1093 break; 1094 case NETDEV_CHANGEMTU: 1095 if (dev->mtu >= 68) 1096 break; 1097 /* MTU falled under 68, disable IP */ 1098 case NETDEV_UNREGISTER: 1099 inetdev_destroy(in_dev); 1100 break; 1101 case NETDEV_CHANGENAME: 1102 /* Do not notify about label change, this event is 1103 * not interesting to applications using netlink. 1104 */ 1105 inetdev_changename(dev, in_dev); 1106 1107 #ifdef CONFIG_SYSCTL 1108 devinet_sysctl_unregister(&in_dev->cnf); 1109 neigh_sysctl_unregister(in_dev->arp_parms); 1110 neigh_sysctl_register(dev, in_dev->arp_parms, NET_IPV4, 1111 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1112 devinet_sysctl_register(in_dev, &in_dev->cnf); 1113 #endif 1114 break; 1115 } 1116 out: 1117 return NOTIFY_DONE; 1118 } 1119 1120 static struct notifier_block ip_netdev_notifier = { 1121 .notifier_call =inetdev_event, 1122 }; 1123 1124 static inline size_t inet_nlmsg_size(void) 1125 { 1126 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1127 + nla_total_size(4) /* IFA_ADDRESS */ 1128 + nla_total_size(4) /* IFA_LOCAL */ 1129 + nla_total_size(4) /* IFA_BROADCAST */ 1130 + nla_total_size(4) /* IFA_ANYCAST */ 1131 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1132 } 1133 1134 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1135 u32 pid, u32 seq, int event, unsigned int flags) 1136 { 1137 struct ifaddrmsg *ifm; 1138 struct nlmsghdr *nlh; 1139 1140 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); 1141 if (nlh == NULL) 1142 return -EMSGSIZE; 1143 1144 ifm = nlmsg_data(nlh); 1145 ifm->ifa_family = AF_INET; 1146 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1147 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; 1148 ifm->ifa_scope = ifa->ifa_scope; 1149 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1150 1151 if (ifa->ifa_address) 1152 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); 1153 1154 if (ifa->ifa_local) 1155 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); 1156 1157 if (ifa->ifa_broadcast) 1158 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); 1159 1160 if (ifa->ifa_anycast) 1161 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); 1162 1163 if (ifa->ifa_label[0]) 1164 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); 1165 1166 return nlmsg_end(skb, nlh); 1167 1168 nla_put_failure: 1169 nlmsg_cancel(skb, nlh); 1170 return -EMSGSIZE; 1171 } 1172 1173 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1174 { 1175 int idx, ip_idx; 1176 struct net_device *dev; 1177 struct in_device *in_dev; 1178 struct in_ifaddr *ifa; 1179 int s_ip_idx, s_idx = cb->args[0]; 1180 1181 s_ip_idx = ip_idx = cb->args[1]; 1182 read_lock(&dev_base_lock); 1183 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { 1184 if (idx < s_idx) 1185 continue; 1186 if (idx > s_idx) 1187 s_ip_idx = 0; 1188 rcu_read_lock(); 1189 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 1190 rcu_read_unlock(); 1191 continue; 1192 } 1193 1194 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1195 ifa = ifa->ifa_next, ip_idx++) { 1196 if (ip_idx < s_ip_idx) 1197 continue; 1198 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, 1199 cb->nlh->nlmsg_seq, 1200 RTM_NEWADDR, NLM_F_MULTI) <= 0) { 1201 rcu_read_unlock(); 1202 goto done; 1203 } 1204 } 1205 rcu_read_unlock(); 1206 } 1207 1208 done: 1209 read_unlock(&dev_base_lock); 1210 cb->args[0] = idx; 1211 cb->args[1] = ip_idx; 1212 1213 return skb->len; 1214 } 1215 1216 static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, 1217 u32 pid) 1218 { 1219 struct sk_buff *skb; 1220 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1221 int err = -ENOBUFS; 1222 1223 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1224 if (skb == NULL) 1225 goto errout; 1226 1227 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); 1228 if (err < 0) { 1229 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1230 WARN_ON(err == -EMSGSIZE); 1231 kfree_skb(skb); 1232 goto errout; 1233 } 1234 err = rtnl_notify(skb, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1235 errout: 1236 if (err < 0) 1237 rtnl_set_sk_err(RTNLGRP_IPV4_IFADDR, err); 1238 } 1239 1240 static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = { 1241 [RTM_NEWADDR - RTM_BASE] = { .doit = inet_rtm_newaddr, }, 1242 [RTM_DELADDR - RTM_BASE] = { .doit = inet_rtm_deladdr, }, 1243 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet_dump_ifaddr, }, 1244 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet_rtm_newroute, }, 1245 [RTM_DELROUTE - RTM_BASE] = { .doit = inet_rtm_delroute, }, 1246 [RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute, 1247 .dumpit = inet_dump_fib, }, 1248 #ifdef CONFIG_IP_MULTIPLE_TABLES 1249 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, }, 1250 #endif 1251 }; 1252 1253 #ifdef CONFIG_SYSCTL 1254 1255 void inet_forward_change(void) 1256 { 1257 struct net_device *dev; 1258 int on = ipv4_devconf.forwarding; 1259 1260 ipv4_devconf.accept_redirects = !on; 1261 ipv4_devconf_dflt.forwarding = on; 1262 1263 read_lock(&dev_base_lock); 1264 for (dev = dev_base; dev; dev = dev->next) { 1265 struct in_device *in_dev; 1266 rcu_read_lock(); 1267 in_dev = __in_dev_get_rcu(dev); 1268 if (in_dev) 1269 in_dev->cnf.forwarding = on; 1270 rcu_read_unlock(); 1271 } 1272 read_unlock(&dev_base_lock); 1273 1274 rt_cache_flush(0); 1275 } 1276 1277 static int devinet_sysctl_forward(ctl_table *ctl, int write, 1278 struct file* filp, void __user *buffer, 1279 size_t *lenp, loff_t *ppos) 1280 { 1281 int *valp = ctl->data; 1282 int val = *valp; 1283 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1284 1285 if (write && *valp != val) { 1286 if (valp == &ipv4_devconf.forwarding) 1287 inet_forward_change(); 1288 else if (valp != &ipv4_devconf_dflt.forwarding) 1289 rt_cache_flush(0); 1290 } 1291 1292 return ret; 1293 } 1294 1295 int ipv4_doint_and_flush(ctl_table *ctl, int write, 1296 struct file* filp, void __user *buffer, 1297 size_t *lenp, loff_t *ppos) 1298 { 1299 int *valp = ctl->data; 1300 int val = *valp; 1301 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1302 1303 if (write && *valp != val) 1304 rt_cache_flush(0); 1305 1306 return ret; 1307 } 1308 1309 int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, 1310 void __user *oldval, size_t __user *oldlenp, 1311 void __user *newval, size_t newlen) 1312 { 1313 int *valp = table->data; 1314 int new; 1315 1316 if (!newval || !newlen) 1317 return 0; 1318 1319 if (newlen != sizeof(int)) 1320 return -EINVAL; 1321 1322 if (get_user(new, (int __user *)newval)) 1323 return -EFAULT; 1324 1325 if (new == *valp) 1326 return 0; 1327 1328 if (oldval && oldlenp) { 1329 size_t len; 1330 1331 if (get_user(len, oldlenp)) 1332 return -EFAULT; 1333 1334 if (len) { 1335 if (len > table->maxlen) 1336 len = table->maxlen; 1337 if (copy_to_user(oldval, valp, len)) 1338 return -EFAULT; 1339 if (put_user(len, oldlenp)) 1340 return -EFAULT; 1341 } 1342 } 1343 1344 *valp = new; 1345 rt_cache_flush(0); 1346 return 1; 1347 } 1348 1349 1350 static struct devinet_sysctl_table { 1351 struct ctl_table_header *sysctl_header; 1352 ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; 1353 ctl_table devinet_dev[2]; 1354 ctl_table devinet_conf_dir[2]; 1355 ctl_table devinet_proto_dir[2]; 1356 ctl_table devinet_root_dir[2]; 1357 } devinet_sysctl = { 1358 .devinet_vars = { 1359 { 1360 .ctl_name = NET_IPV4_CONF_FORWARDING, 1361 .procname = "forwarding", 1362 .data = &ipv4_devconf.forwarding, 1363 .maxlen = sizeof(int), 1364 .mode = 0644, 1365 .proc_handler = &devinet_sysctl_forward, 1366 }, 1367 { 1368 .ctl_name = NET_IPV4_CONF_MC_FORWARDING, 1369 .procname = "mc_forwarding", 1370 .data = &ipv4_devconf.mc_forwarding, 1371 .maxlen = sizeof(int), 1372 .mode = 0444, 1373 .proc_handler = &proc_dointvec, 1374 }, 1375 { 1376 .ctl_name = NET_IPV4_CONF_ACCEPT_REDIRECTS, 1377 .procname = "accept_redirects", 1378 .data = &ipv4_devconf.accept_redirects, 1379 .maxlen = sizeof(int), 1380 .mode = 0644, 1381 .proc_handler = &proc_dointvec, 1382 }, 1383 { 1384 .ctl_name = NET_IPV4_CONF_SECURE_REDIRECTS, 1385 .procname = "secure_redirects", 1386 .data = &ipv4_devconf.secure_redirects, 1387 .maxlen = sizeof(int), 1388 .mode = 0644, 1389 .proc_handler = &proc_dointvec, 1390 }, 1391 { 1392 .ctl_name = NET_IPV4_CONF_SHARED_MEDIA, 1393 .procname = "shared_media", 1394 .data = &ipv4_devconf.shared_media, 1395 .maxlen = sizeof(int), 1396 .mode = 0644, 1397 .proc_handler = &proc_dointvec, 1398 }, 1399 { 1400 .ctl_name = NET_IPV4_CONF_RP_FILTER, 1401 .procname = "rp_filter", 1402 .data = &ipv4_devconf.rp_filter, 1403 .maxlen = sizeof(int), 1404 .mode = 0644, 1405 .proc_handler = &proc_dointvec, 1406 }, 1407 { 1408 .ctl_name = NET_IPV4_CONF_SEND_REDIRECTS, 1409 .procname = "send_redirects", 1410 .data = &ipv4_devconf.send_redirects, 1411 .maxlen = sizeof(int), 1412 .mode = 0644, 1413 .proc_handler = &proc_dointvec, 1414 }, 1415 { 1416 .ctl_name = NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE, 1417 .procname = "accept_source_route", 1418 .data = &ipv4_devconf.accept_source_route, 1419 .maxlen = sizeof(int), 1420 .mode = 0644, 1421 .proc_handler = &proc_dointvec, 1422 }, 1423 { 1424 .ctl_name = NET_IPV4_CONF_PROXY_ARP, 1425 .procname = "proxy_arp", 1426 .data = &ipv4_devconf.proxy_arp, 1427 .maxlen = sizeof(int), 1428 .mode = 0644, 1429 .proc_handler = &proc_dointvec, 1430 }, 1431 { 1432 .ctl_name = NET_IPV4_CONF_MEDIUM_ID, 1433 .procname = "medium_id", 1434 .data = &ipv4_devconf.medium_id, 1435 .maxlen = sizeof(int), 1436 .mode = 0644, 1437 .proc_handler = &proc_dointvec, 1438 }, 1439 { 1440 .ctl_name = NET_IPV4_CONF_BOOTP_RELAY, 1441 .procname = "bootp_relay", 1442 .data = &ipv4_devconf.bootp_relay, 1443 .maxlen = sizeof(int), 1444 .mode = 0644, 1445 .proc_handler = &proc_dointvec, 1446 }, 1447 { 1448 .ctl_name = NET_IPV4_CONF_LOG_MARTIANS, 1449 .procname = "log_martians", 1450 .data = &ipv4_devconf.log_martians, 1451 .maxlen = sizeof(int), 1452 .mode = 0644, 1453 .proc_handler = &proc_dointvec, 1454 }, 1455 { 1456 .ctl_name = NET_IPV4_CONF_TAG, 1457 .procname = "tag", 1458 .data = &ipv4_devconf.tag, 1459 .maxlen = sizeof(int), 1460 .mode = 0644, 1461 .proc_handler = &proc_dointvec, 1462 }, 1463 { 1464 .ctl_name = NET_IPV4_CONF_ARPFILTER, 1465 .procname = "arp_filter", 1466 .data = &ipv4_devconf.arp_filter, 1467 .maxlen = sizeof(int), 1468 .mode = 0644, 1469 .proc_handler = &proc_dointvec, 1470 }, 1471 { 1472 .ctl_name = NET_IPV4_CONF_ARP_ANNOUNCE, 1473 .procname = "arp_announce", 1474 .data = &ipv4_devconf.arp_announce, 1475 .maxlen = sizeof(int), 1476 .mode = 0644, 1477 .proc_handler = &proc_dointvec, 1478 }, 1479 { 1480 .ctl_name = NET_IPV4_CONF_ARP_IGNORE, 1481 .procname = "arp_ignore", 1482 .data = &ipv4_devconf.arp_ignore, 1483 .maxlen = sizeof(int), 1484 .mode = 0644, 1485 .proc_handler = &proc_dointvec, 1486 }, 1487 { 1488 .ctl_name = NET_IPV4_CONF_ARP_ACCEPT, 1489 .procname = "arp_accept", 1490 .data = &ipv4_devconf.arp_accept, 1491 .maxlen = sizeof(int), 1492 .mode = 0644, 1493 .proc_handler = &proc_dointvec, 1494 }, 1495 { 1496 .ctl_name = NET_IPV4_CONF_NOXFRM, 1497 .procname = "disable_xfrm", 1498 .data = &ipv4_devconf.no_xfrm, 1499 .maxlen = sizeof(int), 1500 .mode = 0644, 1501 .proc_handler = &ipv4_doint_and_flush, 1502 .strategy = &ipv4_doint_and_flush_strategy, 1503 }, 1504 { 1505 .ctl_name = NET_IPV4_CONF_NOPOLICY, 1506 .procname = "disable_policy", 1507 .data = &ipv4_devconf.no_policy, 1508 .maxlen = sizeof(int), 1509 .mode = 0644, 1510 .proc_handler = &ipv4_doint_and_flush, 1511 .strategy = &ipv4_doint_and_flush_strategy, 1512 }, 1513 { 1514 .ctl_name = NET_IPV4_CONF_FORCE_IGMP_VERSION, 1515 .procname = "force_igmp_version", 1516 .data = &ipv4_devconf.force_igmp_version, 1517 .maxlen = sizeof(int), 1518 .mode = 0644, 1519 .proc_handler = &ipv4_doint_and_flush, 1520 .strategy = &ipv4_doint_and_flush_strategy, 1521 }, 1522 { 1523 .ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES, 1524 .procname = "promote_secondaries", 1525 .data = &ipv4_devconf.promote_secondaries, 1526 .maxlen = sizeof(int), 1527 .mode = 0644, 1528 .proc_handler = &ipv4_doint_and_flush, 1529 .strategy = &ipv4_doint_and_flush_strategy, 1530 }, 1531 }, 1532 .devinet_dev = { 1533 { 1534 .ctl_name = NET_PROTO_CONF_ALL, 1535 .procname = "all", 1536 .mode = 0555, 1537 .child = devinet_sysctl.devinet_vars, 1538 }, 1539 }, 1540 .devinet_conf_dir = { 1541 { 1542 .ctl_name = NET_IPV4_CONF, 1543 .procname = "conf", 1544 .mode = 0555, 1545 .child = devinet_sysctl.devinet_dev, 1546 }, 1547 }, 1548 .devinet_proto_dir = { 1549 { 1550 .ctl_name = NET_IPV4, 1551 .procname = "ipv4", 1552 .mode = 0555, 1553 .child = devinet_sysctl.devinet_conf_dir, 1554 }, 1555 }, 1556 .devinet_root_dir = { 1557 { 1558 .ctl_name = CTL_NET, 1559 .procname = "net", 1560 .mode = 0555, 1561 .child = devinet_sysctl.devinet_proto_dir, 1562 }, 1563 }, 1564 }; 1565 1566 static void devinet_sysctl_register(struct in_device *in_dev, 1567 struct ipv4_devconf *p) 1568 { 1569 int i; 1570 struct net_device *dev = in_dev ? in_dev->dev : NULL; 1571 struct devinet_sysctl_table *t = kmemdup(&devinet_sysctl, sizeof(*t), 1572 GFP_KERNEL); 1573 char *dev_name = NULL; 1574 1575 if (!t) 1576 return; 1577 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 1578 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 1579 t->devinet_vars[i].de = NULL; 1580 } 1581 1582 if (dev) { 1583 dev_name = dev->name; 1584 t->devinet_dev[0].ctl_name = dev->ifindex; 1585 } else { 1586 dev_name = "default"; 1587 t->devinet_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; 1588 } 1589 1590 /* 1591 * Make a copy of dev_name, because '.procname' is regarded as const 1592 * by sysctl and we wouldn't want anyone to change it under our feet 1593 * (see SIOCSIFNAME). 1594 */ 1595 dev_name = kstrdup(dev_name, GFP_KERNEL); 1596 if (!dev_name) 1597 goto free; 1598 1599 t->devinet_dev[0].procname = dev_name; 1600 t->devinet_dev[0].child = t->devinet_vars; 1601 t->devinet_dev[0].de = NULL; 1602 t->devinet_conf_dir[0].child = t->devinet_dev; 1603 t->devinet_conf_dir[0].de = NULL; 1604 t->devinet_proto_dir[0].child = t->devinet_conf_dir; 1605 t->devinet_proto_dir[0].de = NULL; 1606 t->devinet_root_dir[0].child = t->devinet_proto_dir; 1607 t->devinet_root_dir[0].de = NULL; 1608 1609 t->sysctl_header = register_sysctl_table(t->devinet_root_dir, 0); 1610 if (!t->sysctl_header) 1611 goto free_procname; 1612 1613 p->sysctl = t; 1614 return; 1615 1616 /* error path */ 1617 free_procname: 1618 kfree(dev_name); 1619 free: 1620 kfree(t); 1621 return; 1622 } 1623 1624 static void devinet_sysctl_unregister(struct ipv4_devconf *p) 1625 { 1626 if (p->sysctl) { 1627 struct devinet_sysctl_table *t = p->sysctl; 1628 p->sysctl = NULL; 1629 unregister_sysctl_table(t->sysctl_header); 1630 kfree(t->devinet_dev[0].procname); 1631 kfree(t); 1632 } 1633 } 1634 #endif 1635 1636 void __init devinet_init(void) 1637 { 1638 register_gifconf(PF_INET, inet_gifconf); 1639 register_netdevice_notifier(&ip_netdev_notifier); 1640 rtnetlink_links[PF_INET] = inet_rtnetlink_table; 1641 #ifdef CONFIG_SYSCTL 1642 devinet_sysctl.sysctl_header = 1643 register_sysctl_table(devinet_sysctl.devinet_root_dir, 0); 1644 devinet_sysctl_register(NULL, &ipv4_devconf_dflt); 1645 #endif 1646 } 1647 1648 EXPORT_SYMBOL(in_dev_finish_destroy); 1649 EXPORT_SYMBOL(inet_select_addr); 1650 EXPORT_SYMBOL(inetdev_by_index); 1651 EXPORT_SYMBOL(register_inetaddr_notifier); 1652 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1653