devinet.c revision 4b8aa9abee2e108b132dea7a7c4e81a167895354
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#include <net/net_namespace.h> 66 67static struct ipv4_devconf ipv4_devconf = { 68 .data = { 69 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, 70 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, 71 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, 72 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, 73 }, 74}; 75 76static struct ipv4_devconf ipv4_devconf_dflt = { 77 .data = { 78 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, 79 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, 80 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, 81 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, 82 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1, 83 }, 84}; 85 86#define IPV4_DEVCONF_DFLT(net, attr) \ 87 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) 88 89static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { 90 [IFA_LOCAL] = { .type = NLA_U32 }, 91 [IFA_ADDRESS] = { .type = NLA_U32 }, 92 [IFA_BROADCAST] = { .type = NLA_U32 }, 93 [IFA_ANYCAST] = { .type = NLA_U32 }, 94 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 95}; 96 97static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 98 99static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 100static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 101 int destroy); 102#ifdef CONFIG_SYSCTL 103static void devinet_sysctl_register(struct in_device *idev); 104static void devinet_sysctl_unregister(struct in_device *idev); 105#else 106static inline void devinet_sysctl_register(struct in_device *idev) 107{ 108} 109static inline void devinet_sysctl_unregister(struct in_device *idev) 110{ 111} 112#endif 113 114/* Locks all the inet devices. */ 115 116static struct in_ifaddr *inet_alloc_ifa(void) 117{ 118 struct in_ifaddr *ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); 119 120 if (ifa) { 121 INIT_RCU_HEAD(&ifa->rcu_head); 122 } 123 124 return ifa; 125} 126 127static void inet_rcu_free_ifa(struct rcu_head *head) 128{ 129 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 130 if (ifa->ifa_dev) 131 in_dev_put(ifa->ifa_dev); 132 kfree(ifa); 133} 134 135static inline void inet_free_ifa(struct in_ifaddr *ifa) 136{ 137 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 138} 139 140void in_dev_finish_destroy(struct in_device *idev) 141{ 142 struct net_device *dev = idev->dev; 143 144 BUG_TRAP(!idev->ifa_list); 145 BUG_TRAP(!idev->mc_list); 146#ifdef NET_REFCNT_DEBUG 147 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", 148 idev, dev ? dev->name : "NIL"); 149#endif 150 dev_put(dev); 151 if (!idev->dead) 152 printk("Freeing alive in_device %p\n", idev); 153 else { 154 kfree(idev); 155 } 156} 157 158static struct in_device *inetdev_init(struct net_device *dev) 159{ 160 struct in_device *in_dev; 161 162 ASSERT_RTNL(); 163 164 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 165 if (!in_dev) 166 goto out; 167 INIT_RCU_HEAD(&in_dev->rcu_head); 168 memcpy(&in_dev->cnf, dev->nd_net->ipv4.devconf_dflt, 169 sizeof(in_dev->cnf)); 170 in_dev->cnf.sysctl = NULL; 171 in_dev->dev = dev; 172 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) 173 goto out_kfree; 174 /* Reference in_dev->dev */ 175 dev_hold(dev); 176 /* Account for reference dev->ip_ptr (below) */ 177 in_dev_hold(in_dev); 178 179 devinet_sysctl_register(in_dev); 180 ip_mc_init_dev(in_dev); 181 if (dev->flags & IFF_UP) 182 ip_mc_up(in_dev); 183 184 /* we can receive as soon as ip_ptr is set -- do this last */ 185 rcu_assign_pointer(dev->ip_ptr, in_dev); 186out: 187 return in_dev; 188out_kfree: 189 kfree(in_dev); 190 in_dev = NULL; 191 goto out; 192} 193 194static void in_dev_rcu_put(struct rcu_head *head) 195{ 196 struct in_device *idev = container_of(head, struct in_device, rcu_head); 197 in_dev_put(idev); 198} 199 200static void inetdev_destroy(struct in_device *in_dev) 201{ 202 struct in_ifaddr *ifa; 203 struct net_device *dev; 204 205 ASSERT_RTNL(); 206 207 dev = in_dev->dev; 208 209 in_dev->dead = 1; 210 211 ip_mc_destroy_dev(in_dev); 212 213 while ((ifa = in_dev->ifa_list) != NULL) { 214 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 215 inet_free_ifa(ifa); 216 } 217 218 dev->ip_ptr = NULL; 219 220 devinet_sysctl_unregister(in_dev); 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 227int 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 242static 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 328static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 329 int destroy) 330{ 331 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 332} 333 334static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 335 u32 pid) 336{ 337 struct in_device *in_dev = ifa->ifa_dev; 338 struct in_ifaddr *ifa1, **ifap, **last_primary; 339 340 ASSERT_RTNL(); 341 342 if (!ifa->ifa_local) { 343 inet_free_ifa(ifa); 344 return 0; 345 } 346 347 ifa->ifa_flags &= ~IFA_F_SECONDARY; 348 last_primary = &in_dev->ifa_list; 349 350 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 351 ifap = &ifa1->ifa_next) { 352 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 353 ifa->ifa_scope <= ifa1->ifa_scope) 354 last_primary = &ifa1->ifa_next; 355 if (ifa1->ifa_mask == ifa->ifa_mask && 356 inet_ifa_match(ifa1->ifa_address, ifa)) { 357 if (ifa1->ifa_local == ifa->ifa_local) { 358 inet_free_ifa(ifa); 359 return -EEXIST; 360 } 361 if (ifa1->ifa_scope != ifa->ifa_scope) { 362 inet_free_ifa(ifa); 363 return -EINVAL; 364 } 365 ifa->ifa_flags |= IFA_F_SECONDARY; 366 } 367 } 368 369 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 370 net_srandom(ifa->ifa_local); 371 ifap = last_primary; 372 } 373 374 ifa->ifa_next = *ifap; 375 *ifap = ifa; 376 377 /* Send message first, then call notifier. 378 Notifier will trigger FIB update, so that 379 listeners of netlink will know about new ifaddr */ 380 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); 381 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 382 383 return 0; 384} 385 386static int inet_insert_ifa(struct in_ifaddr *ifa) 387{ 388 return __inet_insert_ifa(ifa, NULL, 0); 389} 390 391static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 392{ 393 struct in_device *in_dev = __in_dev_get_rtnl(dev); 394 395 ASSERT_RTNL(); 396 397 if (!in_dev) { 398 inet_free_ifa(ifa); 399 return -ENOBUFS; 400 } 401 ipv4_devconf_setall(in_dev); 402 if (ifa->ifa_dev != in_dev) { 403 BUG_TRAP(!ifa->ifa_dev); 404 in_dev_hold(in_dev); 405 ifa->ifa_dev = in_dev; 406 } 407 if (ipv4_is_loopback(ifa->ifa_local)) 408 ifa->ifa_scope = RT_SCOPE_HOST; 409 return inet_insert_ifa(ifa); 410} 411 412struct in_device *inetdev_by_index(struct net *net, int ifindex) 413{ 414 struct net_device *dev; 415 struct in_device *in_dev = NULL; 416 read_lock(&dev_base_lock); 417 dev = __dev_get_by_index(net, ifindex); 418 if (dev) 419 in_dev = in_dev_get(dev); 420 read_unlock(&dev_base_lock); 421 return in_dev; 422} 423 424/* Called only from RTNL semaphored context. No locks. */ 425 426struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 427 __be32 mask) 428{ 429 ASSERT_RTNL(); 430 431 for_primary_ifa(in_dev) { 432 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 433 return ifa; 434 } endfor_ifa(in_dev); 435 return NULL; 436} 437 438static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 439{ 440 struct net *net = skb->sk->sk_net; 441 struct nlattr *tb[IFA_MAX+1]; 442 struct in_device *in_dev; 443 struct ifaddrmsg *ifm; 444 struct in_ifaddr *ifa, **ifap; 445 int err = -EINVAL; 446 447 ASSERT_RTNL(); 448 449 if (net != &init_net) 450 return -EINVAL; 451 452 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 453 if (err < 0) 454 goto errout; 455 456 ifm = nlmsg_data(nlh); 457 in_dev = inetdev_by_index(net, ifm->ifa_index); 458 if (in_dev == NULL) { 459 err = -ENODEV; 460 goto errout; 461 } 462 463 __in_dev_put(in_dev); 464 465 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 466 ifap = &ifa->ifa_next) { 467 if (tb[IFA_LOCAL] && 468 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 469 continue; 470 471 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 472 continue; 473 474 if (tb[IFA_ADDRESS] && 475 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 476 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 477 continue; 478 479 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); 480 return 0; 481 } 482 483 err = -EADDRNOTAVAIL; 484errout: 485 return err; 486} 487 488static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) 489{ 490 struct nlattr *tb[IFA_MAX+1]; 491 struct in_ifaddr *ifa; 492 struct ifaddrmsg *ifm; 493 struct net_device *dev; 494 struct in_device *in_dev; 495 int err; 496 497 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 498 if (err < 0) 499 goto errout; 500 501 ifm = nlmsg_data(nlh); 502 err = -EINVAL; 503 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 504 goto errout; 505 506 dev = __dev_get_by_index(net, ifm->ifa_index); 507 err = -ENODEV; 508 if (dev == NULL) 509 goto errout; 510 511 in_dev = __in_dev_get_rtnl(dev); 512 err = -ENOBUFS; 513 if (in_dev == NULL) 514 goto errout; 515 516 ifa = inet_alloc_ifa(); 517 if (ifa == NULL) 518 /* 519 * A potential indev allocation can be left alive, it stays 520 * assigned to its device and is destroy with it. 521 */ 522 goto errout; 523 524 ipv4_devconf_setall(in_dev); 525 in_dev_hold(in_dev); 526 527 if (tb[IFA_ADDRESS] == NULL) 528 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 529 530 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 531 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 532 ifa->ifa_flags = ifm->ifa_flags; 533 ifa->ifa_scope = ifm->ifa_scope; 534 ifa->ifa_dev = in_dev; 535 536 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 537 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 538 539 if (tb[IFA_BROADCAST]) 540 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 541 542 if (tb[IFA_ANYCAST]) 543 ifa->ifa_anycast = nla_get_be32(tb[IFA_ANYCAST]); 544 545 if (tb[IFA_LABEL]) 546 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 547 else 548 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 549 550 return ifa; 551 552errout: 553 return ERR_PTR(err); 554} 555 556static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 557{ 558 struct net *net = skb->sk->sk_net; 559 struct in_ifaddr *ifa; 560 561 ASSERT_RTNL(); 562 563 if (net != &init_net) 564 return -EINVAL; 565 566 ifa = rtm_to_ifaddr(net, nlh); 567 if (IS_ERR(ifa)) 568 return PTR_ERR(ifa); 569 570 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); 571} 572 573/* 574 * Determine a default network mask, based on the IP address. 575 */ 576 577static __inline__ int inet_abc_len(__be32 addr) 578{ 579 int rc = -1; /* Something else, probably a multicast. */ 580 581 if (ipv4_is_zeronet(addr)) 582 rc = 0; 583 else { 584 __u32 haddr = ntohl(addr); 585 586 if (IN_CLASSA(haddr)) 587 rc = 8; 588 else if (IN_CLASSB(haddr)) 589 rc = 16; 590 else if (IN_CLASSC(haddr)) 591 rc = 24; 592 } 593 594 return rc; 595} 596 597 598int devinet_ioctl(unsigned int cmd, void __user *arg) 599{ 600 struct ifreq ifr; 601 struct sockaddr_in sin_orig; 602 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 603 struct in_device *in_dev; 604 struct in_ifaddr **ifap = NULL; 605 struct in_ifaddr *ifa = NULL; 606 struct net_device *dev; 607 char *colon; 608 int ret = -EFAULT; 609 int tryaddrmatch = 0; 610 611 /* 612 * Fetch the caller's info block into kernel space 613 */ 614 615 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 616 goto out; 617 ifr.ifr_name[IFNAMSIZ - 1] = 0; 618 619 /* save original address for comparison */ 620 memcpy(&sin_orig, sin, sizeof(*sin)); 621 622 colon = strchr(ifr.ifr_name, ':'); 623 if (colon) 624 *colon = 0; 625 626#ifdef CONFIG_KMOD 627 dev_load(&init_net, ifr.ifr_name); 628#endif 629 630 switch (cmd) { 631 case SIOCGIFADDR: /* Get interface address */ 632 case SIOCGIFBRDADDR: /* Get the broadcast address */ 633 case SIOCGIFDSTADDR: /* Get the destination address */ 634 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 635 /* Note that these ioctls will not sleep, 636 so that we do not impose a lock. 637 One day we will be forced to put shlock here (I mean SMP) 638 */ 639 tryaddrmatch = (sin_orig.sin_family == AF_INET); 640 memset(sin, 0, sizeof(*sin)); 641 sin->sin_family = AF_INET; 642 break; 643 644 case SIOCSIFFLAGS: 645 ret = -EACCES; 646 if (!capable(CAP_NET_ADMIN)) 647 goto out; 648 break; 649 case SIOCSIFADDR: /* Set interface address (and family) */ 650 case SIOCSIFBRDADDR: /* Set the broadcast address */ 651 case SIOCSIFDSTADDR: /* Set the destination address */ 652 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 653 ret = -EACCES; 654 if (!capable(CAP_NET_ADMIN)) 655 goto out; 656 ret = -EINVAL; 657 if (sin->sin_family != AF_INET) 658 goto out; 659 break; 660 default: 661 ret = -EINVAL; 662 goto out; 663 } 664 665 rtnl_lock(); 666 667 ret = -ENODEV; 668 if ((dev = __dev_get_by_name(&init_net, ifr.ifr_name)) == NULL) 669 goto done; 670 671 if (colon) 672 *colon = ':'; 673 674 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { 675 if (tryaddrmatch) { 676 /* Matthias Andree */ 677 /* compare label and address (4.4BSD style) */ 678 /* note: we only do this for a limited set of ioctls 679 and only if the original address family was AF_INET. 680 This is checked above. */ 681 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 682 ifap = &ifa->ifa_next) { 683 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 684 sin_orig.sin_addr.s_addr == 685 ifa->ifa_address) { 686 break; /* found */ 687 } 688 } 689 } 690 /* we didn't get a match, maybe the application is 691 4.3BSD-style and passed in junk so we fall back to 692 comparing just the label */ 693 if (!ifa) { 694 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 695 ifap = &ifa->ifa_next) 696 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 697 break; 698 } 699 } 700 701 ret = -EADDRNOTAVAIL; 702 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 703 goto done; 704 705 switch (cmd) { 706 case SIOCGIFADDR: /* Get interface address */ 707 sin->sin_addr.s_addr = ifa->ifa_local; 708 goto rarok; 709 710 case SIOCGIFBRDADDR: /* Get the broadcast address */ 711 sin->sin_addr.s_addr = ifa->ifa_broadcast; 712 goto rarok; 713 714 case SIOCGIFDSTADDR: /* Get the destination address */ 715 sin->sin_addr.s_addr = ifa->ifa_address; 716 goto rarok; 717 718 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 719 sin->sin_addr.s_addr = ifa->ifa_mask; 720 goto rarok; 721 722 case SIOCSIFFLAGS: 723 if (colon) { 724 ret = -EADDRNOTAVAIL; 725 if (!ifa) 726 break; 727 ret = 0; 728 if (!(ifr.ifr_flags & IFF_UP)) 729 inet_del_ifa(in_dev, ifap, 1); 730 break; 731 } 732 ret = dev_change_flags(dev, ifr.ifr_flags); 733 break; 734 735 case SIOCSIFADDR: /* Set interface address (and family) */ 736 ret = -EINVAL; 737 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 738 break; 739 740 if (!ifa) { 741 ret = -ENOBUFS; 742 if ((ifa = inet_alloc_ifa()) == NULL) 743 break; 744 if (colon) 745 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 746 else 747 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 748 } else { 749 ret = 0; 750 if (ifa->ifa_local == sin->sin_addr.s_addr) 751 break; 752 inet_del_ifa(in_dev, ifap, 0); 753 ifa->ifa_broadcast = 0; 754 ifa->ifa_anycast = 0; 755 } 756 757 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 758 759 if (!(dev->flags & IFF_POINTOPOINT)) { 760 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 761 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 762 if ((dev->flags & IFF_BROADCAST) && 763 ifa->ifa_prefixlen < 31) 764 ifa->ifa_broadcast = ifa->ifa_address | 765 ~ifa->ifa_mask; 766 } else { 767 ifa->ifa_prefixlen = 32; 768 ifa->ifa_mask = inet_make_mask(32); 769 } 770 ret = inet_set_ifa(dev, ifa); 771 break; 772 773 case SIOCSIFBRDADDR: /* Set the broadcast address */ 774 ret = 0; 775 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 776 inet_del_ifa(in_dev, ifap, 0); 777 ifa->ifa_broadcast = sin->sin_addr.s_addr; 778 inet_insert_ifa(ifa); 779 } 780 break; 781 782 case SIOCSIFDSTADDR: /* Set the destination address */ 783 ret = 0; 784 if (ifa->ifa_address == sin->sin_addr.s_addr) 785 break; 786 ret = -EINVAL; 787 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 788 break; 789 ret = 0; 790 inet_del_ifa(in_dev, ifap, 0); 791 ifa->ifa_address = sin->sin_addr.s_addr; 792 inet_insert_ifa(ifa); 793 break; 794 795 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 796 797 /* 798 * The mask we set must be legal. 799 */ 800 ret = -EINVAL; 801 if (bad_mask(sin->sin_addr.s_addr, 0)) 802 break; 803 ret = 0; 804 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 805 __be32 old_mask = ifa->ifa_mask; 806 inet_del_ifa(in_dev, ifap, 0); 807 ifa->ifa_mask = sin->sin_addr.s_addr; 808 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 809 810 /* See if current broadcast address matches 811 * with current netmask, then recalculate 812 * the broadcast address. Otherwise it's a 813 * funny address, so don't touch it since 814 * the user seems to know what (s)he's doing... 815 */ 816 if ((dev->flags & IFF_BROADCAST) && 817 (ifa->ifa_prefixlen < 31) && 818 (ifa->ifa_broadcast == 819 (ifa->ifa_local|~old_mask))) { 820 ifa->ifa_broadcast = (ifa->ifa_local | 821 ~sin->sin_addr.s_addr); 822 } 823 inet_insert_ifa(ifa); 824 } 825 break; 826 } 827done: 828 rtnl_unlock(); 829out: 830 return ret; 831rarok: 832 rtnl_unlock(); 833 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 834 goto out; 835} 836 837static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 838{ 839 struct in_device *in_dev = __in_dev_get_rtnl(dev); 840 struct in_ifaddr *ifa; 841 struct ifreq ifr; 842 int done = 0; 843 844 if (!in_dev || (ifa = in_dev->ifa_list) == NULL) 845 goto out; 846 847 for (; ifa; ifa = ifa->ifa_next) { 848 if (!buf) { 849 done += sizeof(ifr); 850 continue; 851 } 852 if (len < (int) sizeof(ifr)) 853 break; 854 memset(&ifr, 0, sizeof(struct ifreq)); 855 if (ifa->ifa_label) 856 strcpy(ifr.ifr_name, ifa->ifa_label); 857 else 858 strcpy(ifr.ifr_name, dev->name); 859 860 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 861 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 862 ifa->ifa_local; 863 864 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 865 done = -EFAULT; 866 break; 867 } 868 buf += sizeof(struct ifreq); 869 len -= sizeof(struct ifreq); 870 done += sizeof(struct ifreq); 871 } 872out: 873 return done; 874} 875 876__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 877{ 878 __be32 addr = 0; 879 struct in_device *in_dev; 880 881 rcu_read_lock(); 882 in_dev = __in_dev_get_rcu(dev); 883 if (!in_dev) 884 goto no_in_dev; 885 886 for_primary_ifa(in_dev) { 887 if (ifa->ifa_scope > scope) 888 continue; 889 if (!dst || inet_ifa_match(dst, ifa)) { 890 addr = ifa->ifa_local; 891 break; 892 } 893 if (!addr) 894 addr = ifa->ifa_local; 895 } endfor_ifa(in_dev); 896no_in_dev: 897 rcu_read_unlock(); 898 899 if (addr) 900 goto out; 901 902 /* Not loopback addresses on loopback should be preferred 903 in this case. It is importnat that lo is the first interface 904 in dev_base list. 905 */ 906 read_lock(&dev_base_lock); 907 rcu_read_lock(); 908 for_each_netdev(&init_net, dev) { 909 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) 910 continue; 911 912 for_primary_ifa(in_dev) { 913 if (ifa->ifa_scope != RT_SCOPE_LINK && 914 ifa->ifa_scope <= scope) { 915 addr = ifa->ifa_local; 916 goto out_unlock_both; 917 } 918 } endfor_ifa(in_dev); 919 } 920out_unlock_both: 921 read_unlock(&dev_base_lock); 922 rcu_read_unlock(); 923out: 924 return addr; 925} 926 927static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 928 __be32 local, int scope) 929{ 930 int same = 0; 931 __be32 addr = 0; 932 933 for_ifa(in_dev) { 934 if (!addr && 935 (local == ifa->ifa_local || !local) && 936 ifa->ifa_scope <= scope) { 937 addr = ifa->ifa_local; 938 if (same) 939 break; 940 } 941 if (!same) { 942 same = (!local || inet_ifa_match(local, ifa)) && 943 (!dst || inet_ifa_match(dst, ifa)); 944 if (same && addr) { 945 if (local || !dst) 946 break; 947 /* Is the selected addr into dst subnet? */ 948 if (inet_ifa_match(addr, ifa)) 949 break; 950 /* No, then can we use new local src? */ 951 if (ifa->ifa_scope <= scope) { 952 addr = ifa->ifa_local; 953 break; 954 } 955 /* search for large dst subnet for addr */ 956 same = 0; 957 } 958 } 959 } endfor_ifa(in_dev); 960 961 return same? addr : 0; 962} 963 964/* 965 * Confirm that local IP address exists using wildcards: 966 * - in_dev: only on this interface, 0=any interface 967 * - dst: only in the same subnet as dst, 0=any dst 968 * - local: address, 0=autoselect the local address 969 * - scope: maximum allowed scope value for the local address 970 */ 971__be32 inet_confirm_addr(struct in_device *in_dev, 972 __be32 dst, __be32 local, int scope) 973{ 974 __be32 addr = 0; 975 struct net_device *dev; 976 struct net *net; 977 978 if (scope != RT_SCOPE_LINK) 979 return confirm_addr_indev(in_dev, dst, local, scope); 980 981 net = in_dev->dev->nd_net; 982 read_lock(&dev_base_lock); 983 rcu_read_lock(); 984 for_each_netdev(net, dev) { 985 if ((in_dev = __in_dev_get_rcu(dev))) { 986 addr = confirm_addr_indev(in_dev, dst, local, scope); 987 if (addr) 988 break; 989 } 990 } 991 rcu_read_unlock(); 992 read_unlock(&dev_base_lock); 993 994 return addr; 995} 996 997/* 998 * Device notifier 999 */ 1000 1001int register_inetaddr_notifier(struct notifier_block *nb) 1002{ 1003 return blocking_notifier_chain_register(&inetaddr_chain, nb); 1004} 1005 1006int unregister_inetaddr_notifier(struct notifier_block *nb) 1007{ 1008 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 1009} 1010 1011/* Rename ifa_labels for a device name change. Make some effort to preserve existing 1012 * alias numbering and to create unique labels if possible. 1013*/ 1014static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 1015{ 1016 struct in_ifaddr *ifa; 1017 int named = 0; 1018 1019 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1020 char old[IFNAMSIZ], *dot; 1021 1022 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1023 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1024 if (named++ == 0) 1025 continue; 1026 dot = strchr(old, ':'); 1027 if (dot == NULL) { 1028 sprintf(old, ":%d", named); 1029 dot = old; 1030 } 1031 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { 1032 strcat(ifa->ifa_label, dot); 1033 } else { 1034 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1035 } 1036 } 1037} 1038 1039/* Called only under RTNL semaphore */ 1040 1041static int inetdev_event(struct notifier_block *this, unsigned long event, 1042 void *ptr) 1043{ 1044 struct net_device *dev = ptr; 1045 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1046 1047 if (dev->nd_net != &init_net) 1048 return NOTIFY_DONE; 1049 1050 ASSERT_RTNL(); 1051 1052 if (!in_dev) { 1053 if (event == NETDEV_REGISTER) { 1054 in_dev = inetdev_init(dev); 1055 if (!in_dev) 1056 return notifier_from_errno(-ENOMEM); 1057 if (dev->flags & IFF_LOOPBACK) { 1058 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1059 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1060 } 1061 } 1062 goto out; 1063 } 1064 1065 switch (event) { 1066 case NETDEV_REGISTER: 1067 printk(KERN_DEBUG "inetdev_event: bug\n"); 1068 dev->ip_ptr = NULL; 1069 break; 1070 case NETDEV_UP: 1071 if (dev->mtu < 68) 1072 break; 1073 if (dev->flags & IFF_LOOPBACK) { 1074 struct in_ifaddr *ifa; 1075 if ((ifa = inet_alloc_ifa()) != NULL) { 1076 ifa->ifa_local = 1077 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1078 ifa->ifa_prefixlen = 8; 1079 ifa->ifa_mask = inet_make_mask(8); 1080 in_dev_hold(in_dev); 1081 ifa->ifa_dev = in_dev; 1082 ifa->ifa_scope = RT_SCOPE_HOST; 1083 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1084 inet_insert_ifa(ifa); 1085 } 1086 } 1087 ip_mc_up(in_dev); 1088 break; 1089 case NETDEV_DOWN: 1090 ip_mc_down(in_dev); 1091 break; 1092 case NETDEV_CHANGEMTU: 1093 if (dev->mtu >= 68) 1094 break; 1095 /* MTU falled under 68, disable IP */ 1096 case NETDEV_UNREGISTER: 1097 inetdev_destroy(in_dev); 1098 break; 1099 case NETDEV_CHANGENAME: 1100 /* Do not notify about label change, this event is 1101 * not interesting to applications using netlink. 1102 */ 1103 inetdev_changename(dev, in_dev); 1104 1105 devinet_sysctl_unregister(in_dev); 1106 devinet_sysctl_register(in_dev); 1107 break; 1108 } 1109out: 1110 return NOTIFY_DONE; 1111} 1112 1113static struct notifier_block ip_netdev_notifier = { 1114 .notifier_call =inetdev_event, 1115}; 1116 1117static inline size_t inet_nlmsg_size(void) 1118{ 1119 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1120 + nla_total_size(4) /* IFA_ADDRESS */ 1121 + nla_total_size(4) /* IFA_LOCAL */ 1122 + nla_total_size(4) /* IFA_BROADCAST */ 1123 + nla_total_size(4) /* IFA_ANYCAST */ 1124 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1125} 1126 1127static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1128 u32 pid, u32 seq, int event, unsigned int flags) 1129{ 1130 struct ifaddrmsg *ifm; 1131 struct nlmsghdr *nlh; 1132 1133 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); 1134 if (nlh == NULL) 1135 return -EMSGSIZE; 1136 1137 ifm = nlmsg_data(nlh); 1138 ifm->ifa_family = AF_INET; 1139 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1140 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; 1141 ifm->ifa_scope = ifa->ifa_scope; 1142 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1143 1144 if (ifa->ifa_address) 1145 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); 1146 1147 if (ifa->ifa_local) 1148 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); 1149 1150 if (ifa->ifa_broadcast) 1151 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); 1152 1153 if (ifa->ifa_anycast) 1154 NLA_PUT_BE32(skb, IFA_ANYCAST, ifa->ifa_anycast); 1155 1156 if (ifa->ifa_label[0]) 1157 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); 1158 1159 return nlmsg_end(skb, nlh); 1160 1161nla_put_failure: 1162 nlmsg_cancel(skb, nlh); 1163 return -EMSGSIZE; 1164} 1165 1166static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1167{ 1168 struct net *net = skb->sk->sk_net; 1169 int idx, ip_idx; 1170 struct net_device *dev; 1171 struct in_device *in_dev; 1172 struct in_ifaddr *ifa; 1173 int s_ip_idx, s_idx = cb->args[0]; 1174 1175 if (net != &init_net) 1176 return 0; 1177 1178 s_ip_idx = ip_idx = cb->args[1]; 1179 idx = 0; 1180 for_each_netdev(net, dev) { 1181 if (idx < s_idx) 1182 goto cont; 1183 if (idx > s_idx) 1184 s_ip_idx = 0; 1185 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) 1186 goto cont; 1187 1188 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1189 ifa = ifa->ifa_next, ip_idx++) { 1190 if (ip_idx < s_ip_idx) 1191 continue; 1192 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, 1193 cb->nlh->nlmsg_seq, 1194 RTM_NEWADDR, NLM_F_MULTI) <= 0) 1195 goto done; 1196 } 1197cont: 1198 idx++; 1199 } 1200 1201done: 1202 cb->args[0] = idx; 1203 cb->args[1] = ip_idx; 1204 1205 return skb->len; 1206} 1207 1208static void rtmsg_ifa(int event, struct in_ifaddr* ifa, struct nlmsghdr *nlh, 1209 u32 pid) 1210{ 1211 struct sk_buff *skb; 1212 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1213 int err = -ENOBUFS; 1214 struct net *net; 1215 1216 net = ifa->ifa_dev->dev->nd_net; 1217 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1218 if (skb == NULL) 1219 goto errout; 1220 1221 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); 1222 if (err < 0) { 1223 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1224 WARN_ON(err == -EMSGSIZE); 1225 kfree_skb(skb); 1226 goto errout; 1227 } 1228 err = rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1229errout: 1230 if (err < 0) 1231 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1232} 1233 1234#ifdef CONFIG_SYSCTL 1235 1236static void devinet_copy_dflt_conf(struct net *net, int i) 1237{ 1238 struct net_device *dev; 1239 1240 read_lock(&dev_base_lock); 1241 for_each_netdev(net, dev) { 1242 struct in_device *in_dev; 1243 rcu_read_lock(); 1244 in_dev = __in_dev_get_rcu(dev); 1245 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1246 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1247 rcu_read_unlock(); 1248 } 1249 read_unlock(&dev_base_lock); 1250} 1251 1252static void inet_forward_change(struct net *net) 1253{ 1254 struct net_device *dev; 1255 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1256 1257 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1258 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1259 1260 read_lock(&dev_base_lock); 1261 for_each_netdev(net, dev) { 1262 struct in_device *in_dev; 1263 rcu_read_lock(); 1264 in_dev = __in_dev_get_rcu(dev); 1265 if (in_dev) 1266 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1267 rcu_read_unlock(); 1268 } 1269 read_unlock(&dev_base_lock); 1270 1271 rt_cache_flush(0); 1272} 1273 1274static int devinet_conf_proc(ctl_table *ctl, int write, 1275 struct file* filp, void __user *buffer, 1276 size_t *lenp, loff_t *ppos) 1277{ 1278 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1279 1280 if (write) { 1281 struct ipv4_devconf *cnf = ctl->extra1; 1282 struct net *net = ctl->extra2; 1283 int i = (int *)ctl->data - cnf->data; 1284 1285 set_bit(i, cnf->state); 1286 1287 if (cnf == net->ipv4.devconf_dflt) 1288 devinet_copy_dflt_conf(net, i); 1289 } 1290 1291 return ret; 1292} 1293 1294static int devinet_conf_sysctl(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 struct ipv4_devconf *cnf; 1299 struct net *net; 1300 int *valp = table->data; 1301 int new; 1302 int i; 1303 1304 if (!newval || !newlen) 1305 return 0; 1306 1307 if (newlen != sizeof(int)) 1308 return -EINVAL; 1309 1310 if (get_user(new, (int __user *)newval)) 1311 return -EFAULT; 1312 1313 if (new == *valp) 1314 return 0; 1315 1316 if (oldval && oldlenp) { 1317 size_t len; 1318 1319 if (get_user(len, oldlenp)) 1320 return -EFAULT; 1321 1322 if (len) { 1323 if (len > table->maxlen) 1324 len = table->maxlen; 1325 if (copy_to_user(oldval, valp, len)) 1326 return -EFAULT; 1327 if (put_user(len, oldlenp)) 1328 return -EFAULT; 1329 } 1330 } 1331 1332 *valp = new; 1333 1334 cnf = table->extra1; 1335 net = table->extra2; 1336 i = (int *)table->data - cnf->data; 1337 1338 set_bit(i, cnf->state); 1339 1340 if (cnf == net->ipv4.devconf_dflt) 1341 devinet_copy_dflt_conf(net, i); 1342 1343 return 1; 1344} 1345 1346static int devinet_sysctl_forward(ctl_table *ctl, int write, 1347 struct file* filp, void __user *buffer, 1348 size_t *lenp, loff_t *ppos) 1349{ 1350 int *valp = ctl->data; 1351 int val = *valp; 1352 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1353 1354 if (write && *valp != val) { 1355 struct net *net = ctl->extra2; 1356 1357 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) 1358 inet_forward_change(net); 1359 else if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) 1360 rt_cache_flush(0); 1361 } 1362 1363 return ret; 1364} 1365 1366int ipv4_doint_and_flush(ctl_table *ctl, int write, 1367 struct file* filp, void __user *buffer, 1368 size_t *lenp, loff_t *ppos) 1369{ 1370 int *valp = ctl->data; 1371 int val = *valp; 1372 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1373 1374 if (write && *valp != val) 1375 rt_cache_flush(0); 1376 1377 return ret; 1378} 1379 1380int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, 1381 void __user *oldval, size_t __user *oldlenp, 1382 void __user *newval, size_t newlen) 1383{ 1384 int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp, 1385 newval, newlen); 1386 1387 if (ret == 1) 1388 rt_cache_flush(0); 1389 1390 return ret; 1391} 1392 1393 1394#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ 1395 { \ 1396 .ctl_name = NET_IPV4_CONF_ ## attr, \ 1397 .procname = name, \ 1398 .data = ipv4_devconf.data + \ 1399 NET_IPV4_CONF_ ## attr - 1, \ 1400 .maxlen = sizeof(int), \ 1401 .mode = mval, \ 1402 .proc_handler = proc, \ 1403 .strategy = sysctl, \ 1404 .extra1 = &ipv4_devconf, \ 1405 } 1406 1407#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 1408 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ 1409 devinet_conf_sysctl) 1410 1411#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 1412 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ 1413 devinet_conf_sysctl) 1414 1415#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ 1416 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) 1417 1418#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 1419 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ 1420 ipv4_doint_and_flush_strategy) 1421 1422static struct devinet_sysctl_table { 1423 struct ctl_table_header *sysctl_header; 1424 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; 1425 char *dev_name; 1426} devinet_sysctl = { 1427 .devinet_vars = { 1428 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 1429 devinet_sysctl_forward, 1430 devinet_conf_sysctl), 1431 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 1432 1433 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 1434 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 1435 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 1436 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 1437 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 1438 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 1439 "accept_source_route"), 1440 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 1441 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 1442 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 1443 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 1444 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 1445 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 1446 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 1447 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 1448 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 1449 1450 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 1451 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 1452 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, 1453 "force_igmp_version"), 1454 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 1455 "promote_secondaries"), 1456 }, 1457}; 1458 1459static int __devinet_sysctl_register(struct net *net, char *dev_name, 1460 int ctl_name, struct ipv4_devconf *p) 1461{ 1462 int i; 1463 struct devinet_sysctl_table *t; 1464 1465#define DEVINET_CTL_PATH_DEV 3 1466 1467 struct ctl_path devinet_ctl_path[] = { 1468 { .procname = "net", .ctl_name = CTL_NET, }, 1469 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1470 { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, 1471 { /* to be set */ }, 1472 { }, 1473 }; 1474 1475 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 1476 if (!t) 1477 goto out; 1478 1479 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 1480 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 1481 t->devinet_vars[i].extra1 = p; 1482 t->devinet_vars[i].extra2 = net; 1483 } 1484 1485 /* 1486 * Make a copy of dev_name, because '.procname' is regarded as const 1487 * by sysctl and we wouldn't want anyone to change it under our feet 1488 * (see SIOCSIFNAME). 1489 */ 1490 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 1491 if (!t->dev_name) 1492 goto free; 1493 1494 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; 1495 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; 1496 1497 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, 1498 t->devinet_vars); 1499 if (!t->sysctl_header) 1500 goto free_procname; 1501 1502 p->sysctl = t; 1503 return 0; 1504 1505free_procname: 1506 kfree(t->dev_name); 1507free: 1508 kfree(t); 1509out: 1510 return -ENOBUFS; 1511} 1512 1513static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 1514{ 1515 struct devinet_sysctl_table *t = cnf->sysctl; 1516 1517 if (t == NULL) 1518 return; 1519 1520 cnf->sysctl = NULL; 1521 unregister_sysctl_table(t->sysctl_header); 1522 kfree(t->dev_name); 1523 kfree(t); 1524} 1525 1526static void devinet_sysctl_register(struct in_device *idev) 1527{ 1528 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, 1529 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1530 __devinet_sysctl_register(idev->dev->nd_net, idev->dev->name, 1531 idev->dev->ifindex, &idev->cnf); 1532} 1533 1534static void devinet_sysctl_unregister(struct in_device *idev) 1535{ 1536 __devinet_sysctl_unregister(&idev->cnf); 1537 neigh_sysctl_unregister(idev->arp_parms); 1538} 1539 1540static struct ctl_table ctl_forward_entry[] = { 1541 { 1542 .ctl_name = NET_IPV4_FORWARD, 1543 .procname = "ip_forward", 1544 .data = &ipv4_devconf.data[ 1545 NET_IPV4_CONF_FORWARDING - 1], 1546 .maxlen = sizeof(int), 1547 .mode = 0644, 1548 .proc_handler = devinet_sysctl_forward, 1549 .strategy = devinet_conf_sysctl, 1550 .extra1 = &ipv4_devconf, 1551 .extra2 = &init_net, 1552 }, 1553 { }, 1554}; 1555 1556static __net_initdata struct ctl_path net_ipv4_path[] = { 1557 { .procname = "net", .ctl_name = CTL_NET, }, 1558 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1559 { }, 1560}; 1561#endif 1562 1563static __net_init int devinet_init_net(struct net *net) 1564{ 1565 int err; 1566 struct ipv4_devconf *all, *dflt; 1567#ifdef CONFIG_SYSCTL 1568 struct ctl_table *tbl = ctl_forward_entry; 1569 struct ctl_table_header *forw_hdr; 1570#endif 1571 1572 err = -ENOMEM; 1573 all = &ipv4_devconf; 1574 dflt = &ipv4_devconf_dflt; 1575 1576 if (net != &init_net) { 1577 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 1578 if (all == NULL) 1579 goto err_alloc_all; 1580 1581 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 1582 if (dflt == NULL) 1583 goto err_alloc_dflt; 1584 1585#ifdef CONFIG_SYSCTL 1586 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 1587 if (tbl == NULL) 1588 goto err_alloc_ctl; 1589 1590 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; 1591 tbl[0].extra1 = all; 1592 tbl[0].extra2 = net; 1593#endif 1594 } 1595 1596#ifdef CONFIG_SYSCTL 1597 err = __devinet_sysctl_register(net, "all", 1598 NET_PROTO_CONF_ALL, all); 1599 if (err < 0) 1600 goto err_reg_all; 1601 1602 err = __devinet_sysctl_register(net, "default", 1603 NET_PROTO_CONF_DEFAULT, dflt); 1604 if (err < 0) 1605 goto err_reg_dflt; 1606 1607 err = -ENOMEM; 1608 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); 1609 if (forw_hdr == NULL) 1610 goto err_reg_ctl; 1611 net->ipv4.forw_hdr = forw_hdr; 1612#endif 1613 1614 net->ipv4.devconf_all = all; 1615 net->ipv4.devconf_dflt = dflt; 1616 return 0; 1617 1618#ifdef CONFIG_SYSCTL 1619err_reg_ctl: 1620 __devinet_sysctl_unregister(dflt); 1621err_reg_dflt: 1622 __devinet_sysctl_unregister(all); 1623err_reg_all: 1624 if (tbl != ctl_forward_entry) 1625 kfree(tbl); 1626err_alloc_ctl: 1627#endif 1628 if (dflt != &ipv4_devconf_dflt) 1629 kfree(dflt); 1630err_alloc_dflt: 1631 if (all != &ipv4_devconf) 1632 kfree(all); 1633err_alloc_all: 1634 return err; 1635} 1636 1637static __net_exit void devinet_exit_net(struct net *net) 1638{ 1639#ifdef CONFIG_SYSCTL 1640 struct ctl_table *tbl; 1641 1642 tbl = net->ipv4.forw_hdr->ctl_table_arg; 1643 unregister_net_sysctl_table(net->ipv4.forw_hdr); 1644 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 1645 __devinet_sysctl_unregister(net->ipv4.devconf_all); 1646 kfree(tbl); 1647#endif 1648 kfree(net->ipv4.devconf_dflt); 1649 kfree(net->ipv4.devconf_all); 1650} 1651 1652static __net_initdata struct pernet_operations devinet_ops = { 1653 .init = devinet_init_net, 1654 .exit = devinet_exit_net, 1655}; 1656 1657void __init devinet_init(void) 1658{ 1659 register_pernet_subsys(&devinet_ops); 1660 1661 register_gifconf(PF_INET, inet_gifconf); 1662 register_netdevice_notifier(&ip_netdev_notifier); 1663 1664 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); 1665 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); 1666 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); 1667} 1668 1669EXPORT_SYMBOL(in_dev_finish_destroy); 1670EXPORT_SYMBOL(inet_select_addr); 1671EXPORT_SYMBOL(inetdev_by_index); 1672EXPORT_SYMBOL(register_inetaddr_notifier); 1673EXPORT_SYMBOL(unregister_inetaddr_notifier); 1674