1 /* 2 * NET3 IP device support routines. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Derived from the IP parts of dev.c 1.0.19 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Mark Evans, <evansmp@uhura.aston.ac.uk> 13 * 14 * Additional Authors: 15 * Alan Cox, <gw4pts@gw4pts.ampr.org> 16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 17 * 18 * Changes: 19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr 20 * lists. 21 * Cyrus Durgin: updated for kmod 22 * Matthias Andree: in devinet_ioctl, compare label and 23 * address (4.4BSD alias style support), 24 * fall back to comparing just the label 25 * if no match found. 26 */ 27 28 29 #include <asm/uaccess.h> 30 #include <asm/system.h> 31 #include <linux/bitops.h> 32 #include <linux/capability.h> 33 #include <linux/module.h> 34 #include <linux/types.h> 35 #include <linux/kernel.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/socket.h> 39 #include <linux/sockios.h> 40 #include <linux/in.h> 41 #include <linux/errno.h> 42 #include <linux/interrupt.h> 43 #include <linux/if_addr.h> 44 #include <linux/if_ether.h> 45 #include <linux/inet.h> 46 #include <linux/netdevice.h> 47 #include <linux/etherdevice.h> 48 #include <linux/skbuff.h> 49 #include <linux/init.h> 50 #include <linux/notifier.h> 51 #include <linux/inetdevice.h> 52 #include <linux/igmp.h> 53 #ifdef CONFIG_SYSCTL 54 #include <linux/sysctl.h> 55 #endif 56 #include <linux/kmod.h> 57 58 #include <net/arp.h> 59 #include <net/ip.h> 60 #include <net/route.h> 61 #include <net/ip_fib.h> 62 #include <net/rtnetlink.h> 63 #include <net/net_namespace.h> 64 65 static struct ipv4_devconf ipv4_devconf = { 66 .data = { 67 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, 68 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, 69 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, 70 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, 71 }, 72 }; 73 74 static struct ipv4_devconf ipv4_devconf_dflt = { 75 .data = { 76 [NET_IPV4_CONF_ACCEPT_REDIRECTS - 1] = 1, 77 [NET_IPV4_CONF_SEND_REDIRECTS - 1] = 1, 78 [NET_IPV4_CONF_SECURE_REDIRECTS - 1] = 1, 79 [NET_IPV4_CONF_SHARED_MEDIA - 1] = 1, 80 [NET_IPV4_CONF_ACCEPT_SOURCE_ROUTE - 1] = 1, 81 }, 82 }; 83 84 #define IPV4_DEVCONF_DFLT(net, attr) \ 85 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr) 86 87 static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = { 88 [IFA_LOCAL] = { .type = NLA_U32 }, 89 [IFA_ADDRESS] = { .type = NLA_U32 }, 90 [IFA_BROADCAST] = { .type = NLA_U32 }, 91 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, 92 }; 93 94 static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32); 95 96 static BLOCKING_NOTIFIER_HEAD(inetaddr_chain); 97 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 98 int destroy); 99 #ifdef CONFIG_SYSCTL 100 static void devinet_sysctl_register(struct in_device *idev); 101 static void devinet_sysctl_unregister(struct in_device *idev); 102 #else 103 static inline void devinet_sysctl_register(struct in_device *idev) 104 { 105 } 106 static inline void devinet_sysctl_unregister(struct in_device *idev) 107 { 108 } 109 #endif 110 111 /* Locks all the inet devices. */ 112 113 static struct in_ifaddr *inet_alloc_ifa(void) 114 { 115 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL); 116 } 117 118 static void inet_rcu_free_ifa(struct rcu_head *head) 119 { 120 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head); 121 if (ifa->ifa_dev) 122 in_dev_put(ifa->ifa_dev); 123 kfree(ifa); 124 } 125 126 static inline void inet_free_ifa(struct in_ifaddr *ifa) 127 { 128 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa); 129 } 130 131 void in_dev_finish_destroy(struct in_device *idev) 132 { 133 struct net_device *dev = idev->dev; 134 135 WARN_ON(idev->ifa_list); 136 WARN_ON(idev->mc_list); 137 #ifdef NET_REFCNT_DEBUG 138 printk(KERN_DEBUG "in_dev_finish_destroy: %p=%s\n", 139 idev, dev ? dev->name : "NIL"); 140 #endif 141 dev_put(dev); 142 if (!idev->dead) 143 printk("Freeing alive in_device %p\n", idev); 144 else { 145 kfree(idev); 146 } 147 } 148 149 static struct in_device *inetdev_init(struct net_device *dev) 150 { 151 struct in_device *in_dev; 152 153 ASSERT_RTNL(); 154 155 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL); 156 if (!in_dev) 157 goto out; 158 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt, 159 sizeof(in_dev->cnf)); 160 in_dev->cnf.sysctl = NULL; 161 in_dev->dev = dev; 162 if ((in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl)) == NULL) 163 goto out_kfree; 164 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING)) 165 dev_disable_lro(dev); 166 /* Reference in_dev->dev */ 167 dev_hold(dev); 168 /* Account for reference dev->ip_ptr (below) */ 169 in_dev_hold(in_dev); 170 171 devinet_sysctl_register(in_dev); 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; 200 201 in_dev->dead = 1; 202 203 ip_mc_destroy_dev(in_dev); 204 205 while ((ifa = in_dev->ifa_list) != NULL) { 206 inet_del_ifa(in_dev, &in_dev->ifa_list, 0); 207 inet_free_ifa(ifa); 208 } 209 210 dev->ip_ptr = NULL; 211 212 devinet_sysctl_unregister(in_dev); 213 neigh_parms_release(&arp_tbl, in_dev->arp_parms); 214 arp_ifdown(dev); 215 216 call_rcu(&in_dev->rcu_head, in_dev_rcu_put); 217 } 218 219 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b) 220 { 221 rcu_read_lock(); 222 for_primary_ifa(in_dev) { 223 if (inet_ifa_match(a, ifa)) { 224 if (!b || inet_ifa_match(b, ifa)) { 225 rcu_read_unlock(); 226 return 1; 227 } 228 } 229 } endfor_ifa(in_dev); 230 rcu_read_unlock(); 231 return 0; 232 } 233 234 static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 235 int destroy, struct nlmsghdr *nlh, u32 pid) 236 { 237 struct in_ifaddr *promote = NULL; 238 struct in_ifaddr *ifa, *ifa1 = *ifap; 239 struct in_ifaddr *last_prim = in_dev->ifa_list; 240 struct in_ifaddr *prev_prom = NULL; 241 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev); 242 243 ASSERT_RTNL(); 244 245 /* 1. Deleting primary ifaddr forces deletion all secondaries 246 * unless alias promotion is set 247 **/ 248 249 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) { 250 struct in_ifaddr **ifap1 = &ifa1->ifa_next; 251 252 while ((ifa = *ifap1) != NULL) { 253 if (!(ifa->ifa_flags & IFA_F_SECONDARY) && 254 ifa1->ifa_scope <= ifa->ifa_scope) 255 last_prim = ifa; 256 257 if (!(ifa->ifa_flags & IFA_F_SECONDARY) || 258 ifa1->ifa_mask != ifa->ifa_mask || 259 !inet_ifa_match(ifa1->ifa_address, ifa)) { 260 ifap1 = &ifa->ifa_next; 261 prev_prom = ifa; 262 continue; 263 } 264 265 if (!do_promote) { 266 *ifap1 = ifa->ifa_next; 267 268 rtmsg_ifa(RTM_DELADDR, ifa, nlh, pid); 269 blocking_notifier_call_chain(&inetaddr_chain, 270 NETDEV_DOWN, ifa); 271 inet_free_ifa(ifa); 272 } else { 273 promote = ifa; 274 break; 275 } 276 } 277 } 278 279 /* 2. Unlink it */ 280 281 *ifap = ifa1->ifa_next; 282 283 /* 3. Announce address deletion */ 284 285 /* Send message first, then call notifier. 286 At first sight, FIB update triggered by notifier 287 will refer to already deleted ifaddr, that could confuse 288 netlink listeners. It is not true: look, gated sees 289 that route deleted and if it still thinks that ifaddr 290 is valid, it will try to restore deleted routes... Grr. 291 So that, this order is correct. 292 */ 293 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, pid); 294 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1); 295 296 if (promote) { 297 298 if (prev_prom) { 299 prev_prom->ifa_next = promote->ifa_next; 300 promote->ifa_next = last_prim->ifa_next; 301 last_prim->ifa_next = promote; 302 } 303 304 promote->ifa_flags &= ~IFA_F_SECONDARY; 305 rtmsg_ifa(RTM_NEWADDR, promote, nlh, pid); 306 blocking_notifier_call_chain(&inetaddr_chain, 307 NETDEV_UP, promote); 308 for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) { 309 if (ifa1->ifa_mask != ifa->ifa_mask || 310 !inet_ifa_match(ifa1->ifa_address, ifa)) 311 continue; 312 fib_add_ifaddr(ifa); 313 } 314 315 } 316 if (destroy) 317 inet_free_ifa(ifa1); 318 } 319 320 static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap, 321 int destroy) 322 { 323 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0); 324 } 325 326 static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh, 327 u32 pid) 328 { 329 struct in_device *in_dev = ifa->ifa_dev; 330 struct in_ifaddr *ifa1, **ifap, **last_primary; 331 332 ASSERT_RTNL(); 333 334 if (!ifa->ifa_local) { 335 inet_free_ifa(ifa); 336 return 0; 337 } 338 339 ifa->ifa_flags &= ~IFA_F_SECONDARY; 340 last_primary = &in_dev->ifa_list; 341 342 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; 343 ifap = &ifa1->ifa_next) { 344 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) && 345 ifa->ifa_scope <= ifa1->ifa_scope) 346 last_primary = &ifa1->ifa_next; 347 if (ifa1->ifa_mask == ifa->ifa_mask && 348 inet_ifa_match(ifa1->ifa_address, ifa)) { 349 if (ifa1->ifa_local == ifa->ifa_local) { 350 inet_free_ifa(ifa); 351 return -EEXIST; 352 } 353 if (ifa1->ifa_scope != ifa->ifa_scope) { 354 inet_free_ifa(ifa); 355 return -EINVAL; 356 } 357 ifa->ifa_flags |= IFA_F_SECONDARY; 358 } 359 } 360 361 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) { 362 net_srandom(ifa->ifa_local); 363 ifap = last_primary; 364 } 365 366 ifa->ifa_next = *ifap; 367 *ifap = ifa; 368 369 /* Send message first, then call notifier. 370 Notifier will trigger FIB update, so that 371 listeners of netlink will know about new ifaddr */ 372 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, pid); 373 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa); 374 375 return 0; 376 } 377 378 static int inet_insert_ifa(struct in_ifaddr *ifa) 379 { 380 return __inet_insert_ifa(ifa, NULL, 0); 381 } 382 383 static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa) 384 { 385 struct in_device *in_dev = __in_dev_get_rtnl(dev); 386 387 ASSERT_RTNL(); 388 389 if (!in_dev) { 390 inet_free_ifa(ifa); 391 return -ENOBUFS; 392 } 393 ipv4_devconf_setall(in_dev); 394 if (ifa->ifa_dev != in_dev) { 395 WARN_ON(ifa->ifa_dev); 396 in_dev_hold(in_dev); 397 ifa->ifa_dev = in_dev; 398 } 399 if (ipv4_is_loopback(ifa->ifa_local)) 400 ifa->ifa_scope = RT_SCOPE_HOST; 401 return inet_insert_ifa(ifa); 402 } 403 404 struct in_device *inetdev_by_index(struct net *net, int ifindex) 405 { 406 struct net_device *dev; 407 struct in_device *in_dev = NULL; 408 read_lock(&dev_base_lock); 409 dev = __dev_get_by_index(net, ifindex); 410 if (dev) 411 in_dev = in_dev_get(dev); 412 read_unlock(&dev_base_lock); 413 return in_dev; 414 } 415 416 /* Called only from RTNL semaphored context. No locks. */ 417 418 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, 419 __be32 mask) 420 { 421 ASSERT_RTNL(); 422 423 for_primary_ifa(in_dev) { 424 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa)) 425 return ifa; 426 } endfor_ifa(in_dev); 427 return NULL; 428 } 429 430 static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 431 { 432 struct net *net = sock_net(skb->sk); 433 struct nlattr *tb[IFA_MAX+1]; 434 struct in_device *in_dev; 435 struct ifaddrmsg *ifm; 436 struct in_ifaddr *ifa, **ifap; 437 int err = -EINVAL; 438 439 ASSERT_RTNL(); 440 441 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 442 if (err < 0) 443 goto errout; 444 445 ifm = nlmsg_data(nlh); 446 in_dev = inetdev_by_index(net, ifm->ifa_index); 447 if (in_dev == NULL) { 448 err = -ENODEV; 449 goto errout; 450 } 451 452 __in_dev_put(in_dev); 453 454 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 455 ifap = &ifa->ifa_next) { 456 if (tb[IFA_LOCAL] && 457 ifa->ifa_local != nla_get_be32(tb[IFA_LOCAL])) 458 continue; 459 460 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) 461 continue; 462 463 if (tb[IFA_ADDRESS] && 464 (ifm->ifa_prefixlen != ifa->ifa_prefixlen || 465 !inet_ifa_match(nla_get_be32(tb[IFA_ADDRESS]), ifa))) 466 continue; 467 468 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).pid); 469 return 0; 470 } 471 472 err = -EADDRNOTAVAIL; 473 errout: 474 return err; 475 } 476 477 static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh) 478 { 479 struct nlattr *tb[IFA_MAX+1]; 480 struct in_ifaddr *ifa; 481 struct ifaddrmsg *ifm; 482 struct net_device *dev; 483 struct in_device *in_dev; 484 int err; 485 486 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy); 487 if (err < 0) 488 goto errout; 489 490 ifm = nlmsg_data(nlh); 491 err = -EINVAL; 492 if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) 493 goto errout; 494 495 dev = __dev_get_by_index(net, ifm->ifa_index); 496 err = -ENODEV; 497 if (dev == NULL) 498 goto errout; 499 500 in_dev = __in_dev_get_rtnl(dev); 501 err = -ENOBUFS; 502 if (in_dev == NULL) 503 goto errout; 504 505 ifa = inet_alloc_ifa(); 506 if (ifa == NULL) 507 /* 508 * A potential indev allocation can be left alive, it stays 509 * assigned to its device and is destroy with it. 510 */ 511 goto errout; 512 513 ipv4_devconf_setall(in_dev); 514 in_dev_hold(in_dev); 515 516 if (tb[IFA_ADDRESS] == NULL) 517 tb[IFA_ADDRESS] = tb[IFA_LOCAL]; 518 519 ifa->ifa_prefixlen = ifm->ifa_prefixlen; 520 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen); 521 ifa->ifa_flags = ifm->ifa_flags; 522 ifa->ifa_scope = ifm->ifa_scope; 523 ifa->ifa_dev = in_dev; 524 525 ifa->ifa_local = nla_get_be32(tb[IFA_LOCAL]); 526 ifa->ifa_address = nla_get_be32(tb[IFA_ADDRESS]); 527 528 if (tb[IFA_BROADCAST]) 529 ifa->ifa_broadcast = nla_get_be32(tb[IFA_BROADCAST]); 530 531 if (tb[IFA_LABEL]) 532 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); 533 else 534 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 535 536 return ifa; 537 538 errout: 539 return ERR_PTR(err); 540 } 541 542 static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 543 { 544 struct net *net = sock_net(skb->sk); 545 struct in_ifaddr *ifa; 546 547 ASSERT_RTNL(); 548 549 ifa = rtm_to_ifaddr(net, nlh); 550 if (IS_ERR(ifa)) 551 return PTR_ERR(ifa); 552 553 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).pid); 554 } 555 556 /* 557 * Determine a default network mask, based on the IP address. 558 */ 559 560 static __inline__ int inet_abc_len(__be32 addr) 561 { 562 int rc = -1; /* Something else, probably a multicast. */ 563 564 if (ipv4_is_zeronet(addr)) 565 rc = 0; 566 else { 567 __u32 haddr = ntohl(addr); 568 569 if (IN_CLASSA(haddr)) 570 rc = 8; 571 else if (IN_CLASSB(haddr)) 572 rc = 16; 573 else if (IN_CLASSC(haddr)) 574 rc = 24; 575 } 576 577 return rc; 578 } 579 580 581 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) 582 { 583 struct ifreq ifr; 584 struct sockaddr_in sin_orig; 585 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr; 586 struct in_device *in_dev; 587 struct in_ifaddr **ifap = NULL; 588 struct in_ifaddr *ifa = NULL; 589 struct net_device *dev; 590 char *colon; 591 int ret = -EFAULT; 592 int tryaddrmatch = 0; 593 594 /* 595 * Fetch the caller's info block into kernel space 596 */ 597 598 if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) 599 goto out; 600 ifr.ifr_name[IFNAMSIZ - 1] = 0; 601 602 /* save original address for comparison */ 603 memcpy(&sin_orig, sin, sizeof(*sin)); 604 605 colon = strchr(ifr.ifr_name, ':'); 606 if (colon) 607 *colon = 0; 608 609 dev_load(net, ifr.ifr_name); 610 611 switch (cmd) { 612 case SIOCGIFADDR: /* Get interface address */ 613 case SIOCGIFBRDADDR: /* Get the broadcast address */ 614 case SIOCGIFDSTADDR: /* Get the destination address */ 615 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 616 /* Note that these ioctls will not sleep, 617 so that we do not impose a lock. 618 One day we will be forced to put shlock here (I mean SMP) 619 */ 620 tryaddrmatch = (sin_orig.sin_family == AF_INET); 621 memset(sin, 0, sizeof(*sin)); 622 sin->sin_family = AF_INET; 623 break; 624 625 case SIOCSIFFLAGS: 626 ret = -EACCES; 627 if (!capable(CAP_NET_ADMIN)) 628 goto out; 629 break; 630 case SIOCSIFADDR: /* Set interface address (and family) */ 631 case SIOCSIFBRDADDR: /* Set the broadcast address */ 632 case SIOCSIFDSTADDR: /* Set the destination address */ 633 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 634 ret = -EACCES; 635 if (!capable(CAP_NET_ADMIN)) 636 goto out; 637 ret = -EINVAL; 638 if (sin->sin_family != AF_INET) 639 goto out; 640 break; 641 default: 642 ret = -EINVAL; 643 goto out; 644 } 645 646 rtnl_lock(); 647 648 ret = -ENODEV; 649 if ((dev = __dev_get_by_name(net, ifr.ifr_name)) == NULL) 650 goto done; 651 652 if (colon) 653 *colon = ':'; 654 655 if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { 656 if (tryaddrmatch) { 657 /* Matthias Andree */ 658 /* compare label and address (4.4BSD style) */ 659 /* note: we only do this for a limited set of ioctls 660 and only if the original address family was AF_INET. 661 This is checked above. */ 662 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 663 ifap = &ifa->ifa_next) { 664 if (!strcmp(ifr.ifr_name, ifa->ifa_label) && 665 sin_orig.sin_addr.s_addr == 666 ifa->ifa_address) { 667 break; /* found */ 668 } 669 } 670 } 671 /* we didn't get a match, maybe the application is 672 4.3BSD-style and passed in junk so we fall back to 673 comparing just the label */ 674 if (!ifa) { 675 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL; 676 ifap = &ifa->ifa_next) 677 if (!strcmp(ifr.ifr_name, ifa->ifa_label)) 678 break; 679 } 680 } 681 682 ret = -EADDRNOTAVAIL; 683 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) 684 goto done; 685 686 switch (cmd) { 687 case SIOCGIFADDR: /* Get interface address */ 688 sin->sin_addr.s_addr = ifa->ifa_local; 689 goto rarok; 690 691 case SIOCGIFBRDADDR: /* Get the broadcast address */ 692 sin->sin_addr.s_addr = ifa->ifa_broadcast; 693 goto rarok; 694 695 case SIOCGIFDSTADDR: /* Get the destination address */ 696 sin->sin_addr.s_addr = ifa->ifa_address; 697 goto rarok; 698 699 case SIOCGIFNETMASK: /* Get the netmask for the interface */ 700 sin->sin_addr.s_addr = ifa->ifa_mask; 701 goto rarok; 702 703 case SIOCSIFFLAGS: 704 if (colon) { 705 ret = -EADDRNOTAVAIL; 706 if (!ifa) 707 break; 708 ret = 0; 709 if (!(ifr.ifr_flags & IFF_UP)) 710 inet_del_ifa(in_dev, ifap, 1); 711 break; 712 } 713 ret = dev_change_flags(dev, ifr.ifr_flags); 714 break; 715 716 case SIOCSIFADDR: /* Set interface address (and family) */ 717 ret = -EINVAL; 718 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 719 break; 720 721 if (!ifa) { 722 ret = -ENOBUFS; 723 if ((ifa = inet_alloc_ifa()) == NULL) 724 break; 725 if (colon) 726 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ); 727 else 728 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 729 } else { 730 ret = 0; 731 if (ifa->ifa_local == sin->sin_addr.s_addr) 732 break; 733 inet_del_ifa(in_dev, ifap, 0); 734 ifa->ifa_broadcast = 0; 735 ifa->ifa_scope = 0; 736 } 737 738 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr; 739 740 if (!(dev->flags & IFF_POINTOPOINT)) { 741 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address); 742 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen); 743 if ((dev->flags & IFF_BROADCAST) && 744 ifa->ifa_prefixlen < 31) 745 ifa->ifa_broadcast = ifa->ifa_address | 746 ~ifa->ifa_mask; 747 } else { 748 ifa->ifa_prefixlen = 32; 749 ifa->ifa_mask = inet_make_mask(32); 750 } 751 ret = inet_set_ifa(dev, ifa); 752 break; 753 754 case SIOCSIFBRDADDR: /* Set the broadcast address */ 755 ret = 0; 756 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) { 757 inet_del_ifa(in_dev, ifap, 0); 758 ifa->ifa_broadcast = sin->sin_addr.s_addr; 759 inet_insert_ifa(ifa); 760 } 761 break; 762 763 case SIOCSIFDSTADDR: /* Set the destination address */ 764 ret = 0; 765 if (ifa->ifa_address == sin->sin_addr.s_addr) 766 break; 767 ret = -EINVAL; 768 if (inet_abc_len(sin->sin_addr.s_addr) < 0) 769 break; 770 ret = 0; 771 inet_del_ifa(in_dev, ifap, 0); 772 ifa->ifa_address = sin->sin_addr.s_addr; 773 inet_insert_ifa(ifa); 774 break; 775 776 case SIOCSIFNETMASK: /* Set the netmask for the interface */ 777 778 /* 779 * The mask we set must be legal. 780 */ 781 ret = -EINVAL; 782 if (bad_mask(sin->sin_addr.s_addr, 0)) 783 break; 784 ret = 0; 785 if (ifa->ifa_mask != sin->sin_addr.s_addr) { 786 __be32 old_mask = ifa->ifa_mask; 787 inet_del_ifa(in_dev, ifap, 0); 788 ifa->ifa_mask = sin->sin_addr.s_addr; 789 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask); 790 791 /* See if current broadcast address matches 792 * with current netmask, then recalculate 793 * the broadcast address. Otherwise it's a 794 * funny address, so don't touch it since 795 * the user seems to know what (s)he's doing... 796 */ 797 if ((dev->flags & IFF_BROADCAST) && 798 (ifa->ifa_prefixlen < 31) && 799 (ifa->ifa_broadcast == 800 (ifa->ifa_local|~old_mask))) { 801 ifa->ifa_broadcast = (ifa->ifa_local | 802 ~sin->sin_addr.s_addr); 803 } 804 inet_insert_ifa(ifa); 805 } 806 break; 807 } 808 done: 809 rtnl_unlock(); 810 out: 811 return ret; 812 rarok: 813 rtnl_unlock(); 814 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0; 815 goto out; 816 } 817 818 static int inet_gifconf(struct net_device *dev, char __user *buf, int len) 819 { 820 struct in_device *in_dev = __in_dev_get_rtnl(dev); 821 struct in_ifaddr *ifa; 822 struct ifreq ifr; 823 int done = 0; 824 825 if (!in_dev || (ifa = in_dev->ifa_list) == NULL) 826 goto out; 827 828 for (; ifa; ifa = ifa->ifa_next) { 829 if (!buf) { 830 done += sizeof(ifr); 831 continue; 832 } 833 if (len < (int) sizeof(ifr)) 834 break; 835 memset(&ifr, 0, sizeof(struct ifreq)); 836 if (ifa->ifa_label) 837 strcpy(ifr.ifr_name, ifa->ifa_label); 838 else 839 strcpy(ifr.ifr_name, dev->name); 840 841 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET; 842 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr = 843 ifa->ifa_local; 844 845 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) { 846 done = -EFAULT; 847 break; 848 } 849 buf += sizeof(struct ifreq); 850 len -= sizeof(struct ifreq); 851 done += sizeof(struct ifreq); 852 } 853 out: 854 return done; 855 } 856 857 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope) 858 { 859 __be32 addr = 0; 860 struct in_device *in_dev; 861 struct net *net = dev_net(dev); 862 863 rcu_read_lock(); 864 in_dev = __in_dev_get_rcu(dev); 865 if (!in_dev) 866 goto no_in_dev; 867 868 for_primary_ifa(in_dev) { 869 if (ifa->ifa_scope > scope) 870 continue; 871 if (!dst || inet_ifa_match(dst, ifa)) { 872 addr = ifa->ifa_local; 873 break; 874 } 875 if (!addr) 876 addr = ifa->ifa_local; 877 } endfor_ifa(in_dev); 878 no_in_dev: 879 rcu_read_unlock(); 880 881 if (addr) 882 goto out; 883 884 /* Not loopback addresses on loopback should be preferred 885 in this case. It is importnat that lo is the first interface 886 in dev_base list. 887 */ 888 read_lock(&dev_base_lock); 889 rcu_read_lock(); 890 for_each_netdev(net, dev) { 891 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) 892 continue; 893 894 for_primary_ifa(in_dev) { 895 if (ifa->ifa_scope != RT_SCOPE_LINK && 896 ifa->ifa_scope <= scope) { 897 addr = ifa->ifa_local; 898 goto out_unlock_both; 899 } 900 } endfor_ifa(in_dev); 901 } 902 out_unlock_both: 903 read_unlock(&dev_base_lock); 904 rcu_read_unlock(); 905 out: 906 return addr; 907 } 908 909 static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst, 910 __be32 local, int scope) 911 { 912 int same = 0; 913 __be32 addr = 0; 914 915 for_ifa(in_dev) { 916 if (!addr && 917 (local == ifa->ifa_local || !local) && 918 ifa->ifa_scope <= scope) { 919 addr = ifa->ifa_local; 920 if (same) 921 break; 922 } 923 if (!same) { 924 same = (!local || inet_ifa_match(local, ifa)) && 925 (!dst || inet_ifa_match(dst, ifa)); 926 if (same && addr) { 927 if (local || !dst) 928 break; 929 /* Is the selected addr into dst subnet? */ 930 if (inet_ifa_match(addr, ifa)) 931 break; 932 /* No, then can we use new local src? */ 933 if (ifa->ifa_scope <= scope) { 934 addr = ifa->ifa_local; 935 break; 936 } 937 /* search for large dst subnet for addr */ 938 same = 0; 939 } 940 } 941 } endfor_ifa(in_dev); 942 943 return same? addr : 0; 944 } 945 946 /* 947 * Confirm that local IP address exists using wildcards: 948 * - in_dev: only on this interface, 0=any interface 949 * - dst: only in the same subnet as dst, 0=any dst 950 * - local: address, 0=autoselect the local address 951 * - scope: maximum allowed scope value for the local address 952 */ 953 __be32 inet_confirm_addr(struct in_device *in_dev, 954 __be32 dst, __be32 local, int scope) 955 { 956 __be32 addr = 0; 957 struct net_device *dev; 958 struct net *net; 959 960 if (scope != RT_SCOPE_LINK) 961 return confirm_addr_indev(in_dev, dst, local, scope); 962 963 net = dev_net(in_dev->dev); 964 read_lock(&dev_base_lock); 965 rcu_read_lock(); 966 for_each_netdev(net, dev) { 967 if ((in_dev = __in_dev_get_rcu(dev))) { 968 addr = confirm_addr_indev(in_dev, dst, local, scope); 969 if (addr) 970 break; 971 } 972 } 973 rcu_read_unlock(); 974 read_unlock(&dev_base_lock); 975 976 return addr; 977 } 978 979 /* 980 * Device notifier 981 */ 982 983 int register_inetaddr_notifier(struct notifier_block *nb) 984 { 985 return blocking_notifier_chain_register(&inetaddr_chain, nb); 986 } 987 988 int unregister_inetaddr_notifier(struct notifier_block *nb) 989 { 990 return blocking_notifier_chain_unregister(&inetaddr_chain, nb); 991 } 992 993 /* Rename ifa_labels for a device name change. Make some effort to preserve existing 994 * alias numbering and to create unique labels if possible. 995 */ 996 static void inetdev_changename(struct net_device *dev, struct in_device *in_dev) 997 { 998 struct in_ifaddr *ifa; 999 int named = 0; 1000 1001 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 1002 char old[IFNAMSIZ], *dot; 1003 1004 memcpy(old, ifa->ifa_label, IFNAMSIZ); 1005 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1006 if (named++ == 0) 1007 goto skip; 1008 dot = strchr(old, ':'); 1009 if (dot == NULL) { 1010 sprintf(old, ":%d", named); 1011 dot = old; 1012 } 1013 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ) { 1014 strcat(ifa->ifa_label, dot); 1015 } else { 1016 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot); 1017 } 1018 skip: 1019 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0); 1020 } 1021 } 1022 1023 static inline bool inetdev_valid_mtu(unsigned mtu) 1024 { 1025 return mtu >= 68; 1026 } 1027 1028 /* Called only under RTNL semaphore */ 1029 1030 static int inetdev_event(struct notifier_block *this, unsigned long event, 1031 void *ptr) 1032 { 1033 struct net_device *dev = ptr; 1034 struct in_device *in_dev = __in_dev_get_rtnl(dev); 1035 1036 ASSERT_RTNL(); 1037 1038 if (!in_dev) { 1039 if (event == NETDEV_REGISTER) { 1040 in_dev = inetdev_init(dev); 1041 if (!in_dev) 1042 return notifier_from_errno(-ENOMEM); 1043 if (dev->flags & IFF_LOOPBACK) { 1044 IN_DEV_CONF_SET(in_dev, NOXFRM, 1); 1045 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1); 1046 } 1047 } else if (event == NETDEV_CHANGEMTU) { 1048 /* Re-enabling IP */ 1049 if (inetdev_valid_mtu(dev->mtu)) 1050 in_dev = inetdev_init(dev); 1051 } 1052 goto out; 1053 } 1054 1055 switch (event) { 1056 case NETDEV_REGISTER: 1057 printk(KERN_DEBUG "inetdev_event: bug\n"); 1058 dev->ip_ptr = NULL; 1059 break; 1060 case NETDEV_UP: 1061 if (!inetdev_valid_mtu(dev->mtu)) 1062 break; 1063 if (dev->flags & IFF_LOOPBACK) { 1064 struct in_ifaddr *ifa; 1065 if ((ifa = inet_alloc_ifa()) != NULL) { 1066 ifa->ifa_local = 1067 ifa->ifa_address = htonl(INADDR_LOOPBACK); 1068 ifa->ifa_prefixlen = 8; 1069 ifa->ifa_mask = inet_make_mask(8); 1070 in_dev_hold(in_dev); 1071 ifa->ifa_dev = in_dev; 1072 ifa->ifa_scope = RT_SCOPE_HOST; 1073 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); 1074 inet_insert_ifa(ifa); 1075 } 1076 } 1077 ip_mc_up(in_dev); 1078 /* fall through */ 1079 case NETDEV_CHANGEADDR: 1080 /* Send gratuitous ARP to notify of link change */ 1081 if (IN_DEV_ARP_NOTIFY(in_dev)) { 1082 struct in_ifaddr *ifa = in_dev->ifa_list; 1083 1084 if (ifa) 1085 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1086 ifa->ifa_address, dev, 1087 ifa->ifa_address, NULL, 1088 dev->dev_addr, NULL); 1089 } 1090 break; 1091 case NETDEV_DOWN: 1092 ip_mc_down(in_dev); 1093 break; 1094 case NETDEV_BONDING_OLDTYPE: 1095 ip_mc_unmap(in_dev); 1096 break; 1097 case NETDEV_BONDING_NEWTYPE: 1098 ip_mc_remap(in_dev); 1099 break; 1100 case NETDEV_CHANGEMTU: 1101 if (inetdev_valid_mtu(dev->mtu)) 1102 break; 1103 /* disable IP when MTU is not enough */ 1104 case NETDEV_UNREGISTER: 1105 inetdev_destroy(in_dev); 1106 break; 1107 case NETDEV_CHANGENAME: 1108 /* Do not notify about label change, this event is 1109 * not interesting to applications using netlink. 1110 */ 1111 inetdev_changename(dev, in_dev); 1112 1113 devinet_sysctl_unregister(in_dev); 1114 devinet_sysctl_register(in_dev); 1115 break; 1116 } 1117 out: 1118 return NOTIFY_DONE; 1119 } 1120 1121 static struct notifier_block ip_netdev_notifier = { 1122 .notifier_call = inetdev_event, 1123 }; 1124 1125 static inline size_t inet_nlmsg_size(void) 1126 { 1127 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1128 + nla_total_size(4) /* IFA_ADDRESS */ 1129 + nla_total_size(4) /* IFA_LOCAL */ 1130 + nla_total_size(4) /* IFA_BROADCAST */ 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_label[0]) 1161 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); 1162 1163 return nlmsg_end(skb, nlh); 1164 1165 nla_put_failure: 1166 nlmsg_cancel(skb, nlh); 1167 return -EMSGSIZE; 1168 } 1169 1170 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1171 { 1172 struct net *net = sock_net(skb->sk); 1173 int idx, ip_idx; 1174 struct net_device *dev; 1175 struct in_device *in_dev; 1176 struct in_ifaddr *ifa; 1177 int s_ip_idx, s_idx = cb->args[0]; 1178 1179 s_ip_idx = ip_idx = cb->args[1]; 1180 idx = 0; 1181 for_each_netdev(net, dev) { 1182 if (idx < s_idx) 1183 goto cont; 1184 if (idx > s_idx) 1185 s_ip_idx = 0; 1186 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) 1187 goto cont; 1188 1189 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1190 ifa = ifa->ifa_next, ip_idx++) { 1191 if (ip_idx < s_ip_idx) 1192 continue; 1193 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, 1194 cb->nlh->nlmsg_seq, 1195 RTM_NEWADDR, NLM_F_MULTI) <= 0) 1196 goto done; 1197 } 1198 cont: 1199 idx++; 1200 } 1201 1202 done: 1203 cb->args[0] = idx; 1204 cb->args[1] = ip_idx; 1205 1206 return skb->len; 1207 } 1208 1209 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1210 u32 pid) 1211 { 1212 struct sk_buff *skb; 1213 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1214 int err = -ENOBUFS; 1215 struct net *net; 1216 1217 net = dev_net(ifa->ifa_dev->dev); 1218 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1219 if (skb == NULL) 1220 goto errout; 1221 1222 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); 1223 if (err < 0) { 1224 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1225 WARN_ON(err == -EMSGSIZE); 1226 kfree_skb(skb); 1227 goto errout; 1228 } 1229 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1230 return; 1231 errout: 1232 if (err < 0) 1233 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1234 } 1235 1236 #ifdef CONFIG_SYSCTL 1237 1238 static void devinet_copy_dflt_conf(struct net *net, int i) 1239 { 1240 struct net_device *dev; 1241 1242 read_lock(&dev_base_lock); 1243 for_each_netdev(net, dev) { 1244 struct in_device *in_dev; 1245 rcu_read_lock(); 1246 in_dev = __in_dev_get_rcu(dev); 1247 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1248 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1249 rcu_read_unlock(); 1250 } 1251 read_unlock(&dev_base_lock); 1252 } 1253 1254 static void inet_forward_change(struct net *net) 1255 { 1256 struct net_device *dev; 1257 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1258 1259 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1260 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1261 1262 read_lock(&dev_base_lock); 1263 for_each_netdev(net, dev) { 1264 struct in_device *in_dev; 1265 if (on) 1266 dev_disable_lro(dev); 1267 rcu_read_lock(); 1268 in_dev = __in_dev_get_rcu(dev); 1269 if (in_dev) 1270 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1271 rcu_read_unlock(); 1272 } 1273 read_unlock(&dev_base_lock); 1274 } 1275 1276 static int devinet_conf_proc(ctl_table *ctl, int write, 1277 void __user *buffer, 1278 size_t *lenp, loff_t *ppos) 1279 { 1280 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1281 1282 if (write) { 1283 struct ipv4_devconf *cnf = ctl->extra1; 1284 struct net *net = ctl->extra2; 1285 int i = (int *)ctl->data - cnf->data; 1286 1287 set_bit(i, cnf->state); 1288 1289 if (cnf == net->ipv4.devconf_dflt) 1290 devinet_copy_dflt_conf(net, i); 1291 } 1292 1293 return ret; 1294 } 1295 1296 static int devinet_conf_sysctl(ctl_table *table, 1297 void __user *oldval, size_t __user *oldlenp, 1298 void __user *newval, size_t newlen) 1299 { 1300 struct ipv4_devconf *cnf; 1301 struct net *net; 1302 int *valp = table->data; 1303 int new; 1304 int i; 1305 1306 if (!newval || !newlen) 1307 return 0; 1308 1309 if (newlen != sizeof(int)) 1310 return -EINVAL; 1311 1312 if (get_user(new, (int __user *)newval)) 1313 return -EFAULT; 1314 1315 if (new == *valp) 1316 return 0; 1317 1318 if (oldval && oldlenp) { 1319 size_t len; 1320 1321 if (get_user(len, oldlenp)) 1322 return -EFAULT; 1323 1324 if (len) { 1325 if (len > table->maxlen) 1326 len = table->maxlen; 1327 if (copy_to_user(oldval, valp, len)) 1328 return -EFAULT; 1329 if (put_user(len, oldlenp)) 1330 return -EFAULT; 1331 } 1332 } 1333 1334 *valp = new; 1335 1336 cnf = table->extra1; 1337 net = table->extra2; 1338 i = (int *)table->data - cnf->data; 1339 1340 set_bit(i, cnf->state); 1341 1342 if (cnf == net->ipv4.devconf_dflt) 1343 devinet_copy_dflt_conf(net, i); 1344 1345 return 1; 1346 } 1347 1348 static int devinet_sysctl_forward(ctl_table *ctl, int write, 1349 void __user *buffer, 1350 size_t *lenp, loff_t *ppos) 1351 { 1352 int *valp = ctl->data; 1353 int val = *valp; 1354 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1355 1356 if (write && *valp != val) { 1357 struct net *net = ctl->extra2; 1358 1359 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 1360 if (!rtnl_trylock()) 1361 return restart_syscall(); 1362 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 1363 inet_forward_change(net); 1364 } else if (*valp) { 1365 struct ipv4_devconf *cnf = ctl->extra1; 1366 struct in_device *idev = 1367 container_of(cnf, struct in_device, cnf); 1368 dev_disable_lro(idev->dev); 1369 } 1370 rtnl_unlock(); 1371 rt_cache_flush(net, 0); 1372 } 1373 } 1374 1375 return ret; 1376 } 1377 1378 int ipv4_doint_and_flush(ctl_table *ctl, int write, 1379 void __user *buffer, 1380 size_t *lenp, loff_t *ppos) 1381 { 1382 int *valp = ctl->data; 1383 int val = *valp; 1384 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 1385 struct net *net = ctl->extra2; 1386 1387 if (write && *valp != val) 1388 rt_cache_flush(net, 0); 1389 1390 return ret; 1391 } 1392 1393 int ipv4_doint_and_flush_strategy(ctl_table *table, 1394 void __user *oldval, size_t __user *oldlenp, 1395 void __user *newval, size_t newlen) 1396 { 1397 int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen); 1398 struct net *net = table->extra2; 1399 1400 if (ret == 1) 1401 rt_cache_flush(net, 0); 1402 1403 return ret; 1404 } 1405 1406 1407 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ 1408 { \ 1409 .ctl_name = NET_IPV4_CONF_ ## attr, \ 1410 .procname = name, \ 1411 .data = ipv4_devconf.data + \ 1412 NET_IPV4_CONF_ ## attr - 1, \ 1413 .maxlen = sizeof(int), \ 1414 .mode = mval, \ 1415 .proc_handler = proc, \ 1416 .strategy = sysctl, \ 1417 .extra1 = &ipv4_devconf, \ 1418 } 1419 1420 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 1421 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ 1422 devinet_conf_sysctl) 1423 1424 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 1425 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ 1426 devinet_conf_sysctl) 1427 1428 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ 1429 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) 1430 1431 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 1432 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ 1433 ipv4_doint_and_flush_strategy) 1434 1435 static struct devinet_sysctl_table { 1436 struct ctl_table_header *sysctl_header; 1437 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; 1438 char *dev_name; 1439 } devinet_sysctl = { 1440 .devinet_vars = { 1441 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 1442 devinet_sysctl_forward, 1443 devinet_conf_sysctl), 1444 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 1445 1446 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 1447 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 1448 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 1449 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 1450 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 1451 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 1452 "accept_source_route"), 1453 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 1454 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 1455 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 1456 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 1457 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 1458 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 1459 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 1460 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 1461 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 1462 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 1463 1464 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 1465 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 1466 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, 1467 "force_igmp_version"), 1468 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 1469 "promote_secondaries"), 1470 }, 1471 }; 1472 1473 static int __devinet_sysctl_register(struct net *net, char *dev_name, 1474 int ctl_name, struct ipv4_devconf *p) 1475 { 1476 int i; 1477 struct devinet_sysctl_table *t; 1478 1479 #define DEVINET_CTL_PATH_DEV 3 1480 1481 struct ctl_path devinet_ctl_path[] = { 1482 { .procname = "net", .ctl_name = CTL_NET, }, 1483 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1484 { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, 1485 { /* to be set */ }, 1486 { }, 1487 }; 1488 1489 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 1490 if (!t) 1491 goto out; 1492 1493 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 1494 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 1495 t->devinet_vars[i].extra1 = p; 1496 t->devinet_vars[i].extra2 = net; 1497 } 1498 1499 /* 1500 * Make a copy of dev_name, because '.procname' is regarded as const 1501 * by sysctl and we wouldn't want anyone to change it under our feet 1502 * (see SIOCSIFNAME). 1503 */ 1504 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 1505 if (!t->dev_name) 1506 goto free; 1507 1508 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; 1509 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; 1510 1511 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, 1512 t->devinet_vars); 1513 if (!t->sysctl_header) 1514 goto free_procname; 1515 1516 p->sysctl = t; 1517 return 0; 1518 1519 free_procname: 1520 kfree(t->dev_name); 1521 free: 1522 kfree(t); 1523 out: 1524 return -ENOBUFS; 1525 } 1526 1527 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 1528 { 1529 struct devinet_sysctl_table *t = cnf->sysctl; 1530 1531 if (t == NULL) 1532 return; 1533 1534 cnf->sysctl = NULL; 1535 unregister_sysctl_table(t->sysctl_header); 1536 kfree(t->dev_name); 1537 kfree(t); 1538 } 1539 1540 static void devinet_sysctl_register(struct in_device *idev) 1541 { 1542 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, 1543 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1544 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 1545 idev->dev->ifindex, &idev->cnf); 1546 } 1547 1548 static void devinet_sysctl_unregister(struct in_device *idev) 1549 { 1550 __devinet_sysctl_unregister(&idev->cnf); 1551 neigh_sysctl_unregister(idev->arp_parms); 1552 } 1553 1554 static struct ctl_table ctl_forward_entry[] = { 1555 { 1556 .ctl_name = NET_IPV4_FORWARD, 1557 .procname = "ip_forward", 1558 .data = &ipv4_devconf.data[ 1559 NET_IPV4_CONF_FORWARDING - 1], 1560 .maxlen = sizeof(int), 1561 .mode = 0644, 1562 .proc_handler = devinet_sysctl_forward, 1563 .strategy = devinet_conf_sysctl, 1564 .extra1 = &ipv4_devconf, 1565 .extra2 = &init_net, 1566 }, 1567 { }, 1568 }; 1569 1570 static __net_initdata struct ctl_path net_ipv4_path[] = { 1571 { .procname = "net", .ctl_name = CTL_NET, }, 1572 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1573 { }, 1574 }; 1575 #endif 1576 1577 static __net_init int devinet_init_net(struct net *net) 1578 { 1579 int err; 1580 struct ipv4_devconf *all, *dflt; 1581 #ifdef CONFIG_SYSCTL 1582 struct ctl_table *tbl = ctl_forward_entry; 1583 struct ctl_table_header *forw_hdr; 1584 #endif 1585 1586 err = -ENOMEM; 1587 all = &ipv4_devconf; 1588 dflt = &ipv4_devconf_dflt; 1589 1590 if (net != &init_net) { 1591 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 1592 if (all == NULL) 1593 goto err_alloc_all; 1594 1595 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 1596 if (dflt == NULL) 1597 goto err_alloc_dflt; 1598 1599 #ifdef CONFIG_SYSCTL 1600 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 1601 if (tbl == NULL) 1602 goto err_alloc_ctl; 1603 1604 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; 1605 tbl[0].extra1 = all; 1606 tbl[0].extra2 = net; 1607 #endif 1608 } 1609 1610 #ifdef CONFIG_SYSCTL 1611 err = __devinet_sysctl_register(net, "all", 1612 NET_PROTO_CONF_ALL, all); 1613 if (err < 0) 1614 goto err_reg_all; 1615 1616 err = __devinet_sysctl_register(net, "default", 1617 NET_PROTO_CONF_DEFAULT, dflt); 1618 if (err < 0) 1619 goto err_reg_dflt; 1620 1621 err = -ENOMEM; 1622 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); 1623 if (forw_hdr == NULL) 1624 goto err_reg_ctl; 1625 net->ipv4.forw_hdr = forw_hdr; 1626 #endif 1627 1628 net->ipv4.devconf_all = all; 1629 net->ipv4.devconf_dflt = dflt; 1630 return 0; 1631 1632 #ifdef CONFIG_SYSCTL 1633 err_reg_ctl: 1634 __devinet_sysctl_unregister(dflt); 1635 err_reg_dflt: 1636 __devinet_sysctl_unregister(all); 1637 err_reg_all: 1638 if (tbl != ctl_forward_entry) 1639 kfree(tbl); 1640 err_alloc_ctl: 1641 #endif 1642 if (dflt != &ipv4_devconf_dflt) 1643 kfree(dflt); 1644 err_alloc_dflt: 1645 if (all != &ipv4_devconf) 1646 kfree(all); 1647 err_alloc_all: 1648 return err; 1649 } 1650 1651 static __net_exit void devinet_exit_net(struct net *net) 1652 { 1653 #ifdef CONFIG_SYSCTL 1654 struct ctl_table *tbl; 1655 1656 tbl = net->ipv4.forw_hdr->ctl_table_arg; 1657 unregister_net_sysctl_table(net->ipv4.forw_hdr); 1658 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 1659 __devinet_sysctl_unregister(net->ipv4.devconf_all); 1660 kfree(tbl); 1661 #endif 1662 kfree(net->ipv4.devconf_dflt); 1663 kfree(net->ipv4.devconf_all); 1664 } 1665 1666 static __net_initdata struct pernet_operations devinet_ops = { 1667 .init = devinet_init_net, 1668 .exit = devinet_exit_net, 1669 }; 1670 1671 void __init devinet_init(void) 1672 { 1673 register_pernet_subsys(&devinet_ops); 1674 1675 register_gifconf(PF_INET, inet_gifconf); 1676 register_netdevice_notifier(&ip_netdev_notifier); 1677 1678 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); 1679 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); 1680 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); 1681 } 1682 1683 EXPORT_SYMBOL(in_dev_finish_destroy); 1684 EXPORT_SYMBOL(inet_select_addr); 1685 EXPORT_SYMBOL(inetdev_by_index); 1686 EXPORT_SYMBOL(register_inetaddr_notifier); 1687 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1688