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 if (IN_DEV_ARP_NOTIFY(in_dev)) 1081 arp_send(ARPOP_REQUEST, ETH_P_ARP, 1082 in_dev->ifa_list->ifa_address, 1083 dev, 1084 in_dev->ifa_list->ifa_address, 1085 NULL, dev->dev_addr, NULL); 1086 break; 1087 case NETDEV_DOWN: 1088 ip_mc_down(in_dev); 1089 break; 1090 case NETDEV_CHANGEMTU: 1091 if (inetdev_valid_mtu(dev->mtu)) 1092 break; 1093 /* disable IP when MTU is not enough */ 1094 case NETDEV_UNREGISTER: 1095 inetdev_destroy(in_dev); 1096 break; 1097 case NETDEV_CHANGENAME: 1098 /* Do not notify about label change, this event is 1099 * not interesting to applications using netlink. 1100 */ 1101 inetdev_changename(dev, in_dev); 1102 1103 devinet_sysctl_unregister(in_dev); 1104 devinet_sysctl_register(in_dev); 1105 break; 1106 } 1107 out: 1108 return NOTIFY_DONE; 1109 } 1110 1111 static struct notifier_block ip_netdev_notifier = { 1112 .notifier_call = inetdev_event, 1113 }; 1114 1115 static inline size_t inet_nlmsg_size(void) 1116 { 1117 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 1118 + nla_total_size(4) /* IFA_ADDRESS */ 1119 + nla_total_size(4) /* IFA_LOCAL */ 1120 + nla_total_size(4) /* IFA_BROADCAST */ 1121 + nla_total_size(IFNAMSIZ); /* IFA_LABEL */ 1122 } 1123 1124 static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa, 1125 u32 pid, u32 seq, int event, unsigned int flags) 1126 { 1127 struct ifaddrmsg *ifm; 1128 struct nlmsghdr *nlh; 1129 1130 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags); 1131 if (nlh == NULL) 1132 return -EMSGSIZE; 1133 1134 ifm = nlmsg_data(nlh); 1135 ifm->ifa_family = AF_INET; 1136 ifm->ifa_prefixlen = ifa->ifa_prefixlen; 1137 ifm->ifa_flags = ifa->ifa_flags|IFA_F_PERMANENT; 1138 ifm->ifa_scope = ifa->ifa_scope; 1139 ifm->ifa_index = ifa->ifa_dev->dev->ifindex; 1140 1141 if (ifa->ifa_address) 1142 NLA_PUT_BE32(skb, IFA_ADDRESS, ifa->ifa_address); 1143 1144 if (ifa->ifa_local) 1145 NLA_PUT_BE32(skb, IFA_LOCAL, ifa->ifa_local); 1146 1147 if (ifa->ifa_broadcast) 1148 NLA_PUT_BE32(skb, IFA_BROADCAST, ifa->ifa_broadcast); 1149 1150 if (ifa->ifa_label[0]) 1151 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label); 1152 1153 return nlmsg_end(skb, nlh); 1154 1155 nla_put_failure: 1156 nlmsg_cancel(skb, nlh); 1157 return -EMSGSIZE; 1158 } 1159 1160 static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 1161 { 1162 struct net *net = sock_net(skb->sk); 1163 int idx, ip_idx; 1164 struct net_device *dev; 1165 struct in_device *in_dev; 1166 struct in_ifaddr *ifa; 1167 int s_ip_idx, s_idx = cb->args[0]; 1168 1169 s_ip_idx = ip_idx = cb->args[1]; 1170 idx = 0; 1171 for_each_netdev(net, dev) { 1172 if (idx < s_idx) 1173 goto cont; 1174 if (idx > s_idx) 1175 s_ip_idx = 0; 1176 if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) 1177 goto cont; 1178 1179 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa; 1180 ifa = ifa->ifa_next, ip_idx++) { 1181 if (ip_idx < s_ip_idx) 1182 continue; 1183 if (inet_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, 1184 cb->nlh->nlmsg_seq, 1185 RTM_NEWADDR, NLM_F_MULTI) <= 0) 1186 goto done; 1187 } 1188 cont: 1189 idx++; 1190 } 1191 1192 done: 1193 cb->args[0] = idx; 1194 cb->args[1] = ip_idx; 1195 1196 return skb->len; 1197 } 1198 1199 static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh, 1200 u32 pid) 1201 { 1202 struct sk_buff *skb; 1203 u32 seq = nlh ? nlh->nlmsg_seq : 0; 1204 int err = -ENOBUFS; 1205 struct net *net; 1206 1207 net = dev_net(ifa->ifa_dev->dev); 1208 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL); 1209 if (skb == NULL) 1210 goto errout; 1211 1212 err = inet_fill_ifaddr(skb, ifa, pid, seq, event, 0); 1213 if (err < 0) { 1214 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */ 1215 WARN_ON(err == -EMSGSIZE); 1216 kfree_skb(skb); 1217 goto errout; 1218 } 1219 rtnl_notify(skb, net, pid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL); 1220 return; 1221 errout: 1222 if (err < 0) 1223 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err); 1224 } 1225 1226 #ifdef CONFIG_SYSCTL 1227 1228 static void devinet_copy_dflt_conf(struct net *net, int i) 1229 { 1230 struct net_device *dev; 1231 1232 read_lock(&dev_base_lock); 1233 for_each_netdev(net, dev) { 1234 struct in_device *in_dev; 1235 rcu_read_lock(); 1236 in_dev = __in_dev_get_rcu(dev); 1237 if (in_dev && !test_bit(i, in_dev->cnf.state)) 1238 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i]; 1239 rcu_read_unlock(); 1240 } 1241 read_unlock(&dev_base_lock); 1242 } 1243 1244 static void inet_forward_change(struct net *net) 1245 { 1246 struct net_device *dev; 1247 int on = IPV4_DEVCONF_ALL(net, FORWARDING); 1248 1249 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on; 1250 IPV4_DEVCONF_DFLT(net, FORWARDING) = on; 1251 1252 read_lock(&dev_base_lock); 1253 for_each_netdev(net, dev) { 1254 struct in_device *in_dev; 1255 if (on) 1256 dev_disable_lro(dev); 1257 rcu_read_lock(); 1258 in_dev = __in_dev_get_rcu(dev); 1259 if (in_dev) 1260 IN_DEV_CONF_SET(in_dev, FORWARDING, on); 1261 rcu_read_unlock(); 1262 } 1263 read_unlock(&dev_base_lock); 1264 } 1265 1266 static int devinet_conf_proc(ctl_table *ctl, int write, 1267 struct file *filp, void __user *buffer, 1268 size_t *lenp, loff_t *ppos) 1269 { 1270 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1271 1272 if (write) { 1273 struct ipv4_devconf *cnf = ctl->extra1; 1274 struct net *net = ctl->extra2; 1275 int i = (int *)ctl->data - cnf->data; 1276 1277 set_bit(i, cnf->state); 1278 1279 if (cnf == net->ipv4.devconf_dflt) 1280 devinet_copy_dflt_conf(net, i); 1281 } 1282 1283 return ret; 1284 } 1285 1286 static int devinet_conf_sysctl(ctl_table *table, 1287 void __user *oldval, size_t __user *oldlenp, 1288 void __user *newval, size_t newlen) 1289 { 1290 struct ipv4_devconf *cnf; 1291 struct net *net; 1292 int *valp = table->data; 1293 int new; 1294 int i; 1295 1296 if (!newval || !newlen) 1297 return 0; 1298 1299 if (newlen != sizeof(int)) 1300 return -EINVAL; 1301 1302 if (get_user(new, (int __user *)newval)) 1303 return -EFAULT; 1304 1305 if (new == *valp) 1306 return 0; 1307 1308 if (oldval && oldlenp) { 1309 size_t len; 1310 1311 if (get_user(len, oldlenp)) 1312 return -EFAULT; 1313 1314 if (len) { 1315 if (len > table->maxlen) 1316 len = table->maxlen; 1317 if (copy_to_user(oldval, valp, len)) 1318 return -EFAULT; 1319 if (put_user(len, oldlenp)) 1320 return -EFAULT; 1321 } 1322 } 1323 1324 *valp = new; 1325 1326 cnf = table->extra1; 1327 net = table->extra2; 1328 i = (int *)table->data - cnf->data; 1329 1330 set_bit(i, cnf->state); 1331 1332 if (cnf == net->ipv4.devconf_dflt) 1333 devinet_copy_dflt_conf(net, i); 1334 1335 return 1; 1336 } 1337 1338 static int devinet_sysctl_forward(ctl_table *ctl, int write, 1339 struct file *filp, void __user *buffer, 1340 size_t *lenp, loff_t *ppos) 1341 { 1342 int *valp = ctl->data; 1343 int val = *valp; 1344 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1345 1346 if (write && *valp != val) { 1347 struct net *net = ctl->extra2; 1348 1349 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) { 1350 rtnl_lock(); 1351 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) { 1352 inet_forward_change(net); 1353 } else if (*valp) { 1354 struct ipv4_devconf *cnf = ctl->extra1; 1355 struct in_device *idev = 1356 container_of(cnf, struct in_device, cnf); 1357 dev_disable_lro(idev->dev); 1358 } 1359 rtnl_unlock(); 1360 rt_cache_flush(net, 0); 1361 } 1362 } 1363 1364 return ret; 1365 } 1366 1367 int ipv4_doint_and_flush(ctl_table *ctl, int write, 1368 struct file *filp, void __user *buffer, 1369 size_t *lenp, loff_t *ppos) 1370 { 1371 int *valp = ctl->data; 1372 int val = *valp; 1373 int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); 1374 struct net *net = ctl->extra2; 1375 1376 if (write && *valp != val) 1377 rt_cache_flush(net, 0); 1378 1379 return ret; 1380 } 1381 1382 int ipv4_doint_and_flush_strategy(ctl_table *table, 1383 void __user *oldval, size_t __user *oldlenp, 1384 void __user *newval, size_t newlen) 1385 { 1386 int ret = devinet_conf_sysctl(table, oldval, oldlenp, newval, newlen); 1387 struct net *net = table->extra2; 1388 1389 if (ret == 1) 1390 rt_cache_flush(net, 0); 1391 1392 return ret; 1393 } 1394 1395 1396 #define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc, sysctl) \ 1397 { \ 1398 .ctl_name = NET_IPV4_CONF_ ## attr, \ 1399 .procname = name, \ 1400 .data = ipv4_devconf.data + \ 1401 NET_IPV4_CONF_ ## attr - 1, \ 1402 .maxlen = sizeof(int), \ 1403 .mode = mval, \ 1404 .proc_handler = proc, \ 1405 .strategy = sysctl, \ 1406 .extra1 = &ipv4_devconf, \ 1407 } 1408 1409 #define DEVINET_SYSCTL_RW_ENTRY(attr, name) \ 1410 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \ 1411 devinet_conf_sysctl) 1412 1413 #define DEVINET_SYSCTL_RO_ENTRY(attr, name) \ 1414 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \ 1415 devinet_conf_sysctl) 1416 1417 #define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \ 1418 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl) 1419 1420 #define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \ 1421 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush, \ 1422 ipv4_doint_and_flush_strategy) 1423 1424 static struct devinet_sysctl_table { 1425 struct ctl_table_header *sysctl_header; 1426 struct ctl_table devinet_vars[__NET_IPV4_CONF_MAX]; 1427 char *dev_name; 1428 } devinet_sysctl = { 1429 .devinet_vars = { 1430 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding", 1431 devinet_sysctl_forward, 1432 devinet_conf_sysctl), 1433 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"), 1434 1435 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"), 1436 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"), 1437 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"), 1438 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"), 1439 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"), 1440 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE, 1441 "accept_source_route"), 1442 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"), 1443 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"), 1444 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"), 1445 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"), 1446 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"), 1447 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"), 1448 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"), 1449 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"), 1450 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"), 1451 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"), 1452 1453 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"), 1454 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"), 1455 DEVINET_SYSCTL_FLUSHING_ENTRY(FORCE_IGMP_VERSION, 1456 "force_igmp_version"), 1457 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES, 1458 "promote_secondaries"), 1459 }, 1460 }; 1461 1462 static int __devinet_sysctl_register(struct net *net, char *dev_name, 1463 int ctl_name, struct ipv4_devconf *p) 1464 { 1465 int i; 1466 struct devinet_sysctl_table *t; 1467 1468 #define DEVINET_CTL_PATH_DEV 3 1469 1470 struct ctl_path devinet_ctl_path[] = { 1471 { .procname = "net", .ctl_name = CTL_NET, }, 1472 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1473 { .procname = "conf", .ctl_name = NET_IPV4_CONF, }, 1474 { /* to be set */ }, 1475 { }, 1476 }; 1477 1478 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL); 1479 if (!t) 1480 goto out; 1481 1482 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) { 1483 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf; 1484 t->devinet_vars[i].extra1 = p; 1485 t->devinet_vars[i].extra2 = net; 1486 } 1487 1488 /* 1489 * Make a copy of dev_name, because '.procname' is regarded as const 1490 * by sysctl and we wouldn't want anyone to change it under our feet 1491 * (see SIOCSIFNAME). 1492 */ 1493 t->dev_name = kstrdup(dev_name, GFP_KERNEL); 1494 if (!t->dev_name) 1495 goto free; 1496 1497 devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name; 1498 devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name; 1499 1500 t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path, 1501 t->devinet_vars); 1502 if (!t->sysctl_header) 1503 goto free_procname; 1504 1505 p->sysctl = t; 1506 return 0; 1507 1508 free_procname: 1509 kfree(t->dev_name); 1510 free: 1511 kfree(t); 1512 out: 1513 return -ENOBUFS; 1514 } 1515 1516 static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf) 1517 { 1518 struct devinet_sysctl_table *t = cnf->sysctl; 1519 1520 if (t == NULL) 1521 return; 1522 1523 cnf->sysctl = NULL; 1524 unregister_sysctl_table(t->sysctl_header); 1525 kfree(t->dev_name); 1526 kfree(t); 1527 } 1528 1529 static void devinet_sysctl_register(struct in_device *idev) 1530 { 1531 neigh_sysctl_register(idev->dev, idev->arp_parms, NET_IPV4, 1532 NET_IPV4_NEIGH, "ipv4", NULL, NULL); 1533 __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name, 1534 idev->dev->ifindex, &idev->cnf); 1535 } 1536 1537 static void devinet_sysctl_unregister(struct in_device *idev) 1538 { 1539 __devinet_sysctl_unregister(&idev->cnf); 1540 neigh_sysctl_unregister(idev->arp_parms); 1541 } 1542 1543 static struct ctl_table ctl_forward_entry[] = { 1544 { 1545 .ctl_name = NET_IPV4_FORWARD, 1546 .procname = "ip_forward", 1547 .data = &ipv4_devconf.data[ 1548 NET_IPV4_CONF_FORWARDING - 1], 1549 .maxlen = sizeof(int), 1550 .mode = 0644, 1551 .proc_handler = devinet_sysctl_forward, 1552 .strategy = devinet_conf_sysctl, 1553 .extra1 = &ipv4_devconf, 1554 .extra2 = &init_net, 1555 }, 1556 { }, 1557 }; 1558 1559 static __net_initdata struct ctl_path net_ipv4_path[] = { 1560 { .procname = "net", .ctl_name = CTL_NET, }, 1561 { .procname = "ipv4", .ctl_name = NET_IPV4, }, 1562 { }, 1563 }; 1564 #endif 1565 1566 static __net_init int devinet_init_net(struct net *net) 1567 { 1568 int err; 1569 struct ipv4_devconf *all, *dflt; 1570 #ifdef CONFIG_SYSCTL 1571 struct ctl_table *tbl = ctl_forward_entry; 1572 struct ctl_table_header *forw_hdr; 1573 #endif 1574 1575 err = -ENOMEM; 1576 all = &ipv4_devconf; 1577 dflt = &ipv4_devconf_dflt; 1578 1579 if (net != &init_net) { 1580 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL); 1581 if (all == NULL) 1582 goto err_alloc_all; 1583 1584 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL); 1585 if (dflt == NULL) 1586 goto err_alloc_dflt; 1587 1588 #ifdef CONFIG_SYSCTL 1589 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL); 1590 if (tbl == NULL) 1591 goto err_alloc_ctl; 1592 1593 tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1]; 1594 tbl[0].extra1 = all; 1595 tbl[0].extra2 = net; 1596 #endif 1597 } 1598 1599 #ifdef CONFIG_SYSCTL 1600 err = __devinet_sysctl_register(net, "all", 1601 NET_PROTO_CONF_ALL, all); 1602 if (err < 0) 1603 goto err_reg_all; 1604 1605 err = __devinet_sysctl_register(net, "default", 1606 NET_PROTO_CONF_DEFAULT, dflt); 1607 if (err < 0) 1608 goto err_reg_dflt; 1609 1610 err = -ENOMEM; 1611 forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl); 1612 if (forw_hdr == NULL) 1613 goto err_reg_ctl; 1614 net->ipv4.forw_hdr = forw_hdr; 1615 #endif 1616 1617 net->ipv4.devconf_all = all; 1618 net->ipv4.devconf_dflt = dflt; 1619 return 0; 1620 1621 #ifdef CONFIG_SYSCTL 1622 err_reg_ctl: 1623 __devinet_sysctl_unregister(dflt); 1624 err_reg_dflt: 1625 __devinet_sysctl_unregister(all); 1626 err_reg_all: 1627 if (tbl != ctl_forward_entry) 1628 kfree(tbl); 1629 err_alloc_ctl: 1630 #endif 1631 if (dflt != &ipv4_devconf_dflt) 1632 kfree(dflt); 1633 err_alloc_dflt: 1634 if (all != &ipv4_devconf) 1635 kfree(all); 1636 err_alloc_all: 1637 return err; 1638 } 1639 1640 static __net_exit void devinet_exit_net(struct net *net) 1641 { 1642 #ifdef CONFIG_SYSCTL 1643 struct ctl_table *tbl; 1644 1645 tbl = net->ipv4.forw_hdr->ctl_table_arg; 1646 unregister_net_sysctl_table(net->ipv4.forw_hdr); 1647 __devinet_sysctl_unregister(net->ipv4.devconf_dflt); 1648 __devinet_sysctl_unregister(net->ipv4.devconf_all); 1649 kfree(tbl); 1650 #endif 1651 kfree(net->ipv4.devconf_dflt); 1652 kfree(net->ipv4.devconf_all); 1653 } 1654 1655 static __net_initdata struct pernet_operations devinet_ops = { 1656 .init = devinet_init_net, 1657 .exit = devinet_exit_net, 1658 }; 1659 1660 void __init devinet_init(void) 1661 { 1662 register_pernet_subsys(&devinet_ops); 1663 1664 register_gifconf(PF_INET, inet_gifconf); 1665 register_netdevice_notifier(&ip_netdev_notifier); 1666 1667 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL); 1668 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL); 1669 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr); 1670 } 1671 1672 EXPORT_SYMBOL(in_dev_finish_destroy); 1673 EXPORT_SYMBOL(inet_select_addr); 1674 EXPORT_SYMBOL(inetdev_by_index); 1675 EXPORT_SYMBOL(register_inetaddr_notifier); 1676 EXPORT_SYMBOL(unregister_inetaddr_notifier); 1677