1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Routing netlink socket interface: protocol independent part. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 * 15 * Fixes: 16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong. 17 */ 18 19 #include <linux/config.h> 20 #include <linux/errno.h> 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/kernel.h> 25 #include <linux/sched.h> 26 #include <linux/timer.h> 27 #include <linux/string.h> 28 #include <linux/sockios.h> 29 #include <linux/net.h> 30 #include <linux/fcntl.h> 31 #include <linux/mm.h> 32 #include <linux/slab.h> 33 #include <linux/interrupt.h> 34 #include <linux/capability.h> 35 #include <linux/skbuff.h> 36 #include <linux/init.h> 37 #include <linux/security.h> 38 #include <linux/mutex.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/system.h> 42 #include <asm/string.h> 43 44 #include <linux/inet.h> 45 #include <linux/netdevice.h> 46 #include <net/ip.h> 47 #include <net/protocol.h> 48 #include <net/arp.h> 49 #include <net/route.h> 50 #include <net/udp.h> 51 #include <net/sock.h> 52 #include <net/pkt_sched.h> 53 #include <net/netlink.h> 54 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 55 #include <linux/wireless.h> 56 #include <net/iw_handler.h> 57 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 58 59 static DEFINE_MUTEX(rtnl_mutex); 60 61 void rtnl_lock(void) 62 { 63 mutex_lock(&rtnl_mutex); 64 } 65 66 void __rtnl_unlock(void) 67 { 68 mutex_unlock(&rtnl_mutex); 69 } 70 71 void rtnl_unlock(void) 72 { 73 mutex_unlock(&rtnl_mutex); 74 if (rtnl && rtnl->sk_receive_queue.qlen) 75 rtnl->sk_data_ready(rtnl, 0); 76 netdev_run_todo(); 77 } 78 79 int rtnl_trylock(void) 80 { 81 return mutex_trylock(&rtnl_mutex); 82 } 83 84 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) 85 { 86 memset(tb, 0, sizeof(struct rtattr*)*maxattr); 87 88 while (RTA_OK(rta, len)) { 89 unsigned flavor = rta->rta_type; 90 if (flavor && flavor <= maxattr) 91 tb[flavor-1] = rta; 92 rta = RTA_NEXT(rta, len); 93 } 94 return 0; 95 } 96 97 struct sock *rtnl; 98 99 struct rtnetlink_link * rtnetlink_links[NPROTO]; 100 101 static const int rtm_min[RTM_NR_FAMILIES] = 102 { 103 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 104 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 105 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 106 [RTM_FAM(RTM_NEWNEIGH)] = NLMSG_LENGTH(sizeof(struct ndmsg)), 107 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 108 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 109 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 110 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)), 111 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)), 112 [RTM_FAM(RTM_NEWPREFIX)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 113 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 114 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)), 115 [RTM_FAM(RTM_NEWNEIGHTBL)] = NLMSG_LENGTH(sizeof(struct ndtmsg)), 116 }; 117 118 static const int rta_max[RTM_NR_FAMILIES] = 119 { 120 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 121 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 122 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 123 [RTM_FAM(RTM_NEWNEIGH)] = NDA_MAX, 124 [RTM_FAM(RTM_NEWRULE)] = RTA_MAX, 125 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 126 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 127 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 128 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 129 [RTM_FAM(RTM_NEWNEIGHTBL)] = NDTA_MAX, 130 }; 131 132 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 133 { 134 struct rtattr *rta; 135 int size = RTA_LENGTH(attrlen); 136 137 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 138 rta->rta_type = attrtype; 139 rta->rta_len = size; 140 memcpy(RTA_DATA(rta), data, attrlen); 141 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 142 } 143 144 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) 145 { 146 size_t ret = RTA_PAYLOAD(rta); 147 char *src = RTA_DATA(rta); 148 149 if (ret > 0 && src[ret - 1] == '\0') 150 ret--; 151 if (size > 0) { 152 size_t len = (ret >= size) ? size - 1 : ret; 153 memset(dest, 0, size); 154 memcpy(dest, src, len); 155 } 156 return ret; 157 } 158 159 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) 160 { 161 int err = 0; 162 163 NETLINK_CB(skb).dst_group = group; 164 if (echo) 165 atomic_inc(&skb->users); 166 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 167 if (echo) 168 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 169 return err; 170 } 171 172 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 173 { 174 struct rtattr *mx = (struct rtattr*)skb->tail; 175 int i; 176 177 RTA_PUT(skb, RTA_METRICS, 0, NULL); 178 for (i=0; i<RTAX_MAX; i++) { 179 if (metrics[i]) 180 RTA_PUT(skb, i+1, sizeof(u32), metrics+i); 181 } 182 mx->rta_len = skb->tail - (u8*)mx; 183 if (mx->rta_len == RTA_LENGTH(0)) 184 skb_trim(skb, (u8*)mx - skb->data); 185 return 0; 186 187 rtattr_failure: 188 skb_trim(skb, (u8*)mx - skb->data); 189 return -1; 190 } 191 192 193 static void set_operstate(struct net_device *dev, unsigned char transition) 194 { 195 unsigned char operstate = dev->operstate; 196 197 switch(transition) { 198 case IF_OPER_UP: 199 if ((operstate == IF_OPER_DORMANT || 200 operstate == IF_OPER_UNKNOWN) && 201 !netif_dormant(dev)) 202 operstate = IF_OPER_UP; 203 break; 204 205 case IF_OPER_DORMANT: 206 if (operstate == IF_OPER_UP || 207 operstate == IF_OPER_UNKNOWN) 208 operstate = IF_OPER_DORMANT; 209 break; 210 }; 211 212 if (dev->operstate != operstate) { 213 write_lock_bh(&dev_base_lock); 214 dev->operstate = operstate; 215 write_unlock_bh(&dev_base_lock); 216 netdev_state_change(dev); 217 } 218 } 219 220 static int rtnetlink_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 221 int type, u32 pid, u32 seq, u32 change, 222 unsigned int flags) 223 { 224 struct ifinfomsg *r; 225 struct nlmsghdr *nlh; 226 unsigned char *b = skb->tail; 227 228 nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*r), flags); 229 r = NLMSG_DATA(nlh); 230 r->ifi_family = AF_UNSPEC; 231 r->__ifi_pad = 0; 232 r->ifi_type = dev->type; 233 r->ifi_index = dev->ifindex; 234 r->ifi_flags = dev_get_flags(dev); 235 r->ifi_change = change; 236 237 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); 238 239 if (1) { 240 u32 txqlen = dev->tx_queue_len; 241 RTA_PUT(skb, IFLA_TXQLEN, sizeof(txqlen), &txqlen); 242 } 243 244 if (1) { 245 u32 weight = dev->weight; 246 RTA_PUT(skb, IFLA_WEIGHT, sizeof(weight), &weight); 247 } 248 249 if (1) { 250 u8 operstate = netif_running(dev)?dev->operstate:IF_OPER_DOWN; 251 u8 link_mode = dev->link_mode; 252 RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); 253 RTA_PUT(skb, IFLA_LINKMODE, sizeof(link_mode), &link_mode); 254 } 255 256 if (1) { 257 struct rtnl_link_ifmap map = { 258 .mem_start = dev->mem_start, 259 .mem_end = dev->mem_end, 260 .base_addr = dev->base_addr, 261 .irq = dev->irq, 262 .dma = dev->dma, 263 .port = dev->if_port, 264 }; 265 RTA_PUT(skb, IFLA_MAP, sizeof(map), &map); 266 } 267 268 if (dev->addr_len) { 269 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 270 RTA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 271 } 272 273 if (1) { 274 u32 mtu = dev->mtu; 275 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); 276 } 277 278 if (dev->ifindex != dev->iflink) { 279 u32 iflink = dev->iflink; 280 RTA_PUT(skb, IFLA_LINK, sizeof(iflink), &iflink); 281 } 282 283 if (dev->qdisc_sleeping) 284 RTA_PUT(skb, IFLA_QDISC, 285 strlen(dev->qdisc_sleeping->ops->id) + 1, 286 dev->qdisc_sleeping->ops->id); 287 288 if (dev->master) { 289 u32 master = dev->master->ifindex; 290 RTA_PUT(skb, IFLA_MASTER, sizeof(master), &master); 291 } 292 293 if (dev->get_stats) { 294 unsigned long *stats = (unsigned long*)dev->get_stats(dev); 295 if (stats) { 296 struct rtattr *a; 297 __u32 *s; 298 int i; 299 int n = sizeof(struct rtnl_link_stats)/4; 300 301 a = __RTA_PUT(skb, IFLA_STATS, n*4); 302 s = RTA_DATA(a); 303 for (i=0; i<n; i++) 304 s[i] = stats[i]; 305 } 306 } 307 nlh->nlmsg_len = skb->tail - b; 308 return skb->len; 309 310 nlmsg_failure: 311 rtattr_failure: 312 skb_trim(skb, b - skb->data); 313 return -1; 314 } 315 316 static int rtnetlink_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 317 { 318 int idx; 319 int s_idx = cb->args[0]; 320 struct net_device *dev; 321 322 read_lock(&dev_base_lock); 323 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 324 if (idx < s_idx) 325 continue; 326 if (rtnetlink_fill_ifinfo(skb, dev, RTM_NEWLINK, 327 NETLINK_CB(cb->skb).pid, 328 cb->nlh->nlmsg_seq, 0, 329 NLM_F_MULTI) <= 0) 330 break; 331 } 332 read_unlock(&dev_base_lock); 333 cb->args[0] = idx; 334 335 return skb->len; 336 } 337 338 static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 339 { 340 struct ifinfomsg *ifm = NLMSG_DATA(nlh); 341 struct rtattr **ida = arg; 342 struct net_device *dev; 343 int err, send_addr_notify = 0; 344 345 if (ifm->ifi_index >= 0) 346 dev = dev_get_by_index(ifm->ifi_index); 347 else if (ida[IFLA_IFNAME - 1]) { 348 char ifname[IFNAMSIZ]; 349 350 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], 351 IFNAMSIZ) >= IFNAMSIZ) 352 return -EINVAL; 353 dev = dev_get_by_name(ifname); 354 } else 355 return -EINVAL; 356 357 if (!dev) 358 return -ENODEV; 359 360 err = -EINVAL; 361 362 if (ifm->ifi_flags) 363 dev_change_flags(dev, ifm->ifi_flags); 364 365 if (ida[IFLA_MAP - 1]) { 366 struct rtnl_link_ifmap *u_map; 367 struct ifmap k_map; 368 369 if (!dev->set_config) { 370 err = -EOPNOTSUPP; 371 goto out; 372 } 373 374 if (!netif_device_present(dev)) { 375 err = -ENODEV; 376 goto out; 377 } 378 379 if (ida[IFLA_MAP - 1]->rta_len != RTA_LENGTH(sizeof(*u_map))) 380 goto out; 381 382 u_map = RTA_DATA(ida[IFLA_MAP - 1]); 383 384 k_map.mem_start = (unsigned long) u_map->mem_start; 385 k_map.mem_end = (unsigned long) u_map->mem_end; 386 k_map.base_addr = (unsigned short) u_map->base_addr; 387 k_map.irq = (unsigned char) u_map->irq; 388 k_map.dma = (unsigned char) u_map->dma; 389 k_map.port = (unsigned char) u_map->port; 390 391 err = dev->set_config(dev, &k_map); 392 393 if (err) 394 goto out; 395 } 396 397 if (ida[IFLA_ADDRESS - 1]) { 398 if (!dev->set_mac_address) { 399 err = -EOPNOTSUPP; 400 goto out; 401 } 402 if (!netif_device_present(dev)) { 403 err = -ENODEV; 404 goto out; 405 } 406 if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len)) 407 goto out; 408 409 err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1])); 410 if (err) 411 goto out; 412 send_addr_notify = 1; 413 } 414 415 if (ida[IFLA_BROADCAST - 1]) { 416 if (ida[IFLA_BROADCAST - 1]->rta_len != RTA_LENGTH(dev->addr_len)) 417 goto out; 418 memcpy(dev->broadcast, RTA_DATA(ida[IFLA_BROADCAST - 1]), 419 dev->addr_len); 420 send_addr_notify = 1; 421 } 422 423 if (ida[IFLA_MTU - 1]) { 424 if (ida[IFLA_MTU - 1]->rta_len != RTA_LENGTH(sizeof(u32))) 425 goto out; 426 err = dev_set_mtu(dev, *((u32 *) RTA_DATA(ida[IFLA_MTU - 1]))); 427 428 if (err) 429 goto out; 430 431 } 432 433 if (ida[IFLA_TXQLEN - 1]) { 434 if (ida[IFLA_TXQLEN - 1]->rta_len != RTA_LENGTH(sizeof(u32))) 435 goto out; 436 437 dev->tx_queue_len = *((u32 *) RTA_DATA(ida[IFLA_TXQLEN - 1])); 438 } 439 440 if (ida[IFLA_WEIGHT - 1]) { 441 if (ida[IFLA_WEIGHT - 1]->rta_len != RTA_LENGTH(sizeof(u32))) 442 goto out; 443 444 dev->weight = *((u32 *) RTA_DATA(ida[IFLA_WEIGHT - 1])); 445 } 446 447 if (ida[IFLA_OPERSTATE - 1]) { 448 if (ida[IFLA_OPERSTATE - 1]->rta_len != RTA_LENGTH(sizeof(u8))) 449 goto out; 450 451 set_operstate(dev, *((u8 *) RTA_DATA(ida[IFLA_OPERSTATE - 1]))); 452 } 453 454 if (ida[IFLA_LINKMODE - 1]) { 455 if (ida[IFLA_LINKMODE - 1]->rta_len != RTA_LENGTH(sizeof(u8))) 456 goto out; 457 458 write_lock_bh(&dev_base_lock); 459 dev->link_mode = *((u8 *) RTA_DATA(ida[IFLA_LINKMODE - 1])); 460 write_unlock_bh(&dev_base_lock); 461 } 462 463 if (ifm->ifi_index >= 0 && ida[IFLA_IFNAME - 1]) { 464 char ifname[IFNAMSIZ]; 465 466 if (rtattr_strlcpy(ifname, ida[IFLA_IFNAME - 1], 467 IFNAMSIZ) >= IFNAMSIZ) 468 goto out; 469 err = dev_change_name(dev, ifname); 470 if (err) 471 goto out; 472 } 473 474 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 475 if (ida[IFLA_WIRELESS - 1]) { 476 477 /* Call Wireless Extensions. 478 * Various stuff checked in there... */ 479 err = wireless_rtnetlink_set(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len); 480 if (err) 481 goto out; 482 } 483 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 484 485 err = 0; 486 487 out: 488 if (send_addr_notify) 489 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 490 491 dev_put(dev); 492 return err; 493 } 494 495 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 496 static int do_getlink(struct sk_buff *in_skb, struct nlmsghdr* in_nlh, void *arg) 497 { 498 struct ifinfomsg *ifm = NLMSG_DATA(in_nlh); 499 struct rtattr **ida = arg; 500 struct net_device *dev; 501 struct ifinfomsg *r; 502 struct nlmsghdr *nlh; 503 int err = -ENOBUFS; 504 struct sk_buff *skb; 505 unsigned char *b; 506 char *iw_buf = NULL; 507 int iw_buf_len = 0; 508 509 if (ifm->ifi_index >= 0) 510 dev = dev_get_by_index(ifm->ifi_index); 511 else 512 return -EINVAL; 513 if (!dev) 514 return -ENODEV; 515 516 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 517 if (ida[IFLA_WIRELESS - 1]) { 518 519 /* Call Wireless Extensions. We need to know the size before 520 * we can alloc. Various stuff checked in there... */ 521 err = wireless_rtnetlink_get(dev, RTA_DATA(ida[IFLA_WIRELESS - 1]), ida[IFLA_WIRELESS - 1]->rta_len, &iw_buf, &iw_buf_len); 522 if (err) 523 goto out; 524 } 525 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 526 527 /* Create a skb big enough to include all the data. 528 * Some requests are way bigger than 4k... Jean II */ 529 skb = alloc_skb((NLMSG_LENGTH(sizeof(*r))) + (RTA_SPACE(iw_buf_len)), 530 GFP_KERNEL); 531 if (!skb) 532 goto out; 533 b = skb->tail; 534 535 /* Put in the message the usual good stuff */ 536 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid, in_nlh->nlmsg_seq, 537 RTM_NEWLINK, sizeof(*r)); 538 r = NLMSG_DATA(nlh); 539 r->ifi_family = AF_UNSPEC; 540 r->__ifi_pad = 0; 541 r->ifi_type = dev->type; 542 r->ifi_index = dev->ifindex; 543 r->ifi_flags = dev->flags; 544 r->ifi_change = 0; 545 546 /* Put the wireless payload if it exist */ 547 if(iw_buf != NULL) 548 RTA_PUT(skb, IFLA_WIRELESS, iw_buf_len, 549 iw_buf + IW_EV_POINT_OFF); 550 551 nlh->nlmsg_len = skb->tail - b; 552 553 /* Needed ? */ 554 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; 555 556 err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); 557 if (err > 0) 558 err = 0; 559 out: 560 if(iw_buf != NULL) 561 kfree(iw_buf); 562 dev_put(dev); 563 return err; 564 565 rtattr_failure: 566 nlmsg_failure: 567 kfree_skb(skb); 568 goto out; 569 } 570 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 571 572 static int rtnetlink_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 573 { 574 int idx; 575 int s_idx = cb->family; 576 577 if (s_idx == 0) 578 s_idx = 1; 579 for (idx=1; idx<NPROTO; idx++) { 580 int type = cb->nlh->nlmsg_type-RTM_BASE; 581 if (idx < s_idx || idx == PF_PACKET) 582 continue; 583 if (rtnetlink_links[idx] == NULL || 584 rtnetlink_links[idx][type].dumpit == NULL) 585 continue; 586 if (idx > s_idx) 587 memset(&cb->args[0], 0, sizeof(cb->args)); 588 if (rtnetlink_links[idx][type].dumpit(skb, cb)) 589 break; 590 } 591 cb->family = idx; 592 593 return skb->len; 594 } 595 596 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 597 { 598 struct sk_buff *skb; 599 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + 600 sizeof(struct rtnl_link_ifmap) + 601 sizeof(struct rtnl_link_stats) + 128); 602 603 skb = alloc_skb(size, GFP_KERNEL); 604 if (!skb) 605 return; 606 607 if (rtnetlink_fill_ifinfo(skb, dev, type, 0, 0, change, 0) < 0) { 608 kfree_skb(skb); 609 return; 610 } 611 NETLINK_CB(skb).dst_group = RTNLGRP_LINK; 612 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL); 613 } 614 615 /* Protected by RTNL sempahore. */ 616 static struct rtattr **rta_buf; 617 static int rtattr_max; 618 619 /* Process one rtnetlink message. */ 620 621 static __inline__ int 622 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) 623 { 624 struct rtnetlink_link *link; 625 struct rtnetlink_link *link_tab; 626 int sz_idx, kind; 627 int min_len; 628 int family; 629 int type; 630 int err; 631 632 /* Only requests are handled by kernel now */ 633 if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) 634 return 0; 635 636 type = nlh->nlmsg_type; 637 638 /* A control message: ignore them */ 639 if (type < RTM_BASE) 640 return 0; 641 642 /* Unknown message: reply with EINVAL */ 643 if (type > RTM_MAX) 644 goto err_inval; 645 646 type -= RTM_BASE; 647 648 /* All the messages must have at least 1 byte length */ 649 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 650 return 0; 651 652 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 653 if (family >= NPROTO) { 654 *errp = -EAFNOSUPPORT; 655 return -1; 656 } 657 658 link_tab = rtnetlink_links[family]; 659 if (link_tab == NULL) 660 link_tab = rtnetlink_links[PF_UNSPEC]; 661 link = &link_tab[type]; 662 663 sz_idx = type>>2; 664 kind = type&3; 665 666 if (kind != 2 && security_netlink_recv(skb)) { 667 *errp = -EPERM; 668 return -1; 669 } 670 671 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 672 if (link->dumpit == NULL) 673 link = &(rtnetlink_links[PF_UNSPEC][type]); 674 675 if (link->dumpit == NULL) 676 goto err_inval; 677 678 if ((*errp = netlink_dump_start(rtnl, skb, nlh, 679 link->dumpit, NULL)) != 0) { 680 return -1; 681 } 682 683 netlink_queue_skip(nlh, skb); 684 return -1; 685 } 686 687 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 688 689 min_len = rtm_min[sz_idx]; 690 if (nlh->nlmsg_len < min_len) 691 goto err_inval; 692 693 if (nlh->nlmsg_len > min_len) { 694 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 695 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 696 697 while (RTA_OK(attr, attrlen)) { 698 unsigned flavor = attr->rta_type; 699 if (flavor) { 700 if (flavor > rta_max[sz_idx]) 701 goto err_inval; 702 rta_buf[flavor-1] = attr; 703 } 704 attr = RTA_NEXT(attr, attrlen); 705 } 706 } 707 708 if (link->doit == NULL) 709 link = &(rtnetlink_links[PF_UNSPEC][type]); 710 if (link->doit == NULL) 711 goto err_inval; 712 err = link->doit(skb, nlh, (void *)&rta_buf[0]); 713 714 *errp = err; 715 return err; 716 717 err_inval: 718 *errp = -EINVAL; 719 return -1; 720 } 721 722 static void rtnetlink_rcv(struct sock *sk, int len) 723 { 724 unsigned int qlen = 0; 725 726 do { 727 mutex_lock(&rtnl_mutex); 728 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); 729 mutex_unlock(&rtnl_mutex); 730 731 netdev_run_todo(); 732 } while (qlen); 733 } 734 735 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = 736 { 737 [RTM_GETLINK - RTM_BASE] = { 738 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 739 .doit = do_getlink, 740 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 741 .dumpit = rtnetlink_dump_ifinfo }, 742 [RTM_SETLINK - RTM_BASE] = { .doit = do_setlink }, 743 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, 744 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, 745 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, 746 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, 747 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, 748 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnetlink_dump_all }, 749 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, 750 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, 751 }; 752 753 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 754 { 755 struct net_device *dev = ptr; 756 switch (event) { 757 case NETDEV_UNREGISTER: 758 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 759 break; 760 case NETDEV_REGISTER: 761 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 762 break; 763 case NETDEV_UP: 764 case NETDEV_DOWN: 765 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 766 break; 767 case NETDEV_CHANGE: 768 case NETDEV_GOING_DOWN: 769 break; 770 default: 771 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 772 break; 773 } 774 return NOTIFY_DONE; 775 } 776 777 static struct notifier_block rtnetlink_dev_notifier = { 778 .notifier_call = rtnetlink_event, 779 }; 780 781 void __init rtnetlink_init(void) 782 { 783 int i; 784 785 rtattr_max = 0; 786 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 787 if (rta_max[i] > rtattr_max) 788 rtattr_max = rta_max[i]; 789 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 790 if (!rta_buf) 791 panic("rtnetlink_init: cannot allocate rta_buf\n"); 792 793 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, 794 THIS_MODULE); 795 if (rtnl == NULL) 796 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 797 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 798 register_netdevice_notifier(&rtnetlink_dev_notifier); 799 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; 800 rtnetlink_links[PF_PACKET] = link_rtnetlink_table; 801 } 802 803 EXPORT_SYMBOL(__rta_fill); 804 EXPORT_SYMBOL(rtattr_strlcpy); 805 EXPORT_SYMBOL(rtattr_parse); 806 EXPORT_SYMBOL(rtnetlink_links); 807 EXPORT_SYMBOL(rtnetlink_put_metrics); 808 EXPORT_SYMBOL(rtnl); 809 EXPORT_SYMBOL(rtnl_lock); 810 EXPORT_SYMBOL(rtnl_trylock); 811 EXPORT_SYMBOL(rtnl_unlock); 812