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