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/errno.h> 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/timer.h> 26 #include <linux/string.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/fcntl.h> 30 #include <linux/mm.h> 31 #include <linux/slab.h> 32 #include <linux/interrupt.h> 33 #include <linux/capability.h> 34 #include <linux/skbuff.h> 35 #include <linux/init.h> 36 #include <linux/security.h> 37 #include <linux/mutex.h> 38 #include <linux/if_addr.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/fib_rules.h> 54 #include <net/netlink.h> 55 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 56 #include <linux/wireless.h> 57 #include <net/iw_handler.h> 58 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 59 60 static DEFINE_MUTEX(rtnl_mutex); 61 62 void rtnl_lock(void) 63 { 64 mutex_lock(&rtnl_mutex); 65 } 66 67 void __rtnl_unlock(void) 68 { 69 mutex_unlock(&rtnl_mutex); 70 } 71 72 void rtnl_unlock(void) 73 { 74 mutex_unlock(&rtnl_mutex); 75 if (rtnl && rtnl->sk_receive_queue.qlen) 76 rtnl->sk_data_ready(rtnl, 0); 77 netdev_run_todo(); 78 } 79 80 int rtnl_trylock(void) 81 { 82 return mutex_trylock(&rtnl_mutex); 83 } 84 85 int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len) 86 { 87 memset(tb, 0, sizeof(struct rtattr*)*maxattr); 88 89 while (RTA_OK(rta, len)) { 90 unsigned flavor = rta->rta_type; 91 if (flavor && flavor <= maxattr) 92 tb[flavor-1] = rta; 93 rta = RTA_NEXT(rta, len); 94 } 95 return 0; 96 } 97 98 struct sock *rtnl; 99 100 struct rtnetlink_link * rtnetlink_links[NPROTO]; 101 102 static const int rtm_min[RTM_NR_FAMILIES] = 103 { 104 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)), 105 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)), 106 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)), 107 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)), 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 }; 116 117 static const int rta_max[RTM_NR_FAMILIES] = 118 { 119 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX, 120 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX, 121 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX, 122 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX, 123 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX, 124 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX, 125 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX, 126 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX, 127 }; 128 129 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data) 130 { 131 struct rtattr *rta; 132 int size = RTA_LENGTH(attrlen); 133 134 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size)); 135 rta->rta_type = attrtype; 136 rta->rta_len = size; 137 memcpy(RTA_DATA(rta), data, attrlen); 138 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size); 139 } 140 141 size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size) 142 { 143 size_t ret = RTA_PAYLOAD(rta); 144 char *src = RTA_DATA(rta); 145 146 if (ret > 0 && src[ret - 1] == '\0') 147 ret--; 148 if (size > 0) { 149 size_t len = (ret >= size) ? size - 1 : ret; 150 memset(dest, 0, size); 151 memcpy(dest, src, len); 152 } 153 return ret; 154 } 155 156 int rtnetlink_send(struct sk_buff *skb, u32 pid, unsigned group, int echo) 157 { 158 int err = 0; 159 160 NETLINK_CB(skb).dst_group = group; 161 if (echo) 162 atomic_inc(&skb->users); 163 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL); 164 if (echo) 165 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT); 166 return err; 167 } 168 169 int rtnl_unicast(struct sk_buff *skb, u32 pid) 170 { 171 return nlmsg_unicast(rtnl, skb, pid); 172 } 173 174 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics) 175 { 176 struct rtattr *mx = (struct rtattr*)skb->tail; 177 int i; 178 179 RTA_PUT(skb, RTA_METRICS, 0, NULL); 180 for (i=0; i<RTAX_MAX; i++) { 181 if (metrics[i]) 182 RTA_PUT(skb, i+1, sizeof(u32), metrics+i); 183 } 184 mx->rta_len = skb->tail - (u8*)mx; 185 if (mx->rta_len == RTA_LENGTH(0)) 186 skb_trim(skb, (u8*)mx - skb->data); 187 return 0; 188 189 rtattr_failure: 190 skb_trim(skb, (u8*)mx - skb->data); 191 return -1; 192 } 193 194 195 static void set_operstate(struct net_device *dev, unsigned char transition) 196 { 197 unsigned char operstate = dev->operstate; 198 199 switch(transition) { 200 case IF_OPER_UP: 201 if ((operstate == IF_OPER_DORMANT || 202 operstate == IF_OPER_UNKNOWN) && 203 !netif_dormant(dev)) 204 operstate = IF_OPER_UP; 205 break; 206 207 case IF_OPER_DORMANT: 208 if (operstate == IF_OPER_UP || 209 operstate == IF_OPER_UNKNOWN) 210 operstate = IF_OPER_DORMANT; 211 break; 212 }; 213 214 if (dev->operstate != operstate) { 215 write_lock_bh(&dev_base_lock); 216 dev->operstate = operstate; 217 write_unlock_bh(&dev_base_lock); 218 netdev_state_change(dev); 219 } 220 } 221 222 static void copy_rtnl_link_stats(struct rtnl_link_stats *a, 223 struct net_device_stats *b) 224 { 225 a->rx_packets = b->rx_packets; 226 a->tx_packets = b->tx_packets; 227 a->rx_bytes = b->rx_bytes; 228 a->tx_bytes = b->tx_bytes; 229 a->rx_errors = b->rx_errors; 230 a->tx_errors = b->tx_errors; 231 a->rx_dropped = b->rx_dropped; 232 a->tx_dropped = b->tx_dropped; 233 234 a->multicast = b->multicast; 235 a->collisions = b->collisions; 236 237 a->rx_length_errors = b->rx_length_errors; 238 a->rx_over_errors = b->rx_over_errors; 239 a->rx_crc_errors = b->rx_crc_errors; 240 a->rx_frame_errors = b->rx_frame_errors; 241 a->rx_fifo_errors = b->rx_fifo_errors; 242 a->rx_missed_errors = b->rx_missed_errors; 243 244 a->tx_aborted_errors = b->tx_aborted_errors; 245 a->tx_carrier_errors = b->tx_carrier_errors; 246 a->tx_fifo_errors = b->tx_fifo_errors; 247 a->tx_heartbeat_errors = b->tx_heartbeat_errors; 248 a->tx_window_errors = b->tx_window_errors; 249 250 a->rx_compressed = b->rx_compressed; 251 a->tx_compressed = b->tx_compressed; 252 }; 253 254 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev, 255 void *iwbuf, int iwbuflen, int type, u32 pid, 256 u32 seq, u32 change, unsigned int flags) 257 { 258 struct ifinfomsg *ifm; 259 struct nlmsghdr *nlh; 260 261 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags); 262 if (nlh == NULL) 263 return -ENOBUFS; 264 265 ifm = nlmsg_data(nlh); 266 ifm->ifi_family = AF_UNSPEC; 267 ifm->__ifi_pad = 0; 268 ifm->ifi_type = dev->type; 269 ifm->ifi_index = dev->ifindex; 270 ifm->ifi_flags = dev_get_flags(dev); 271 ifm->ifi_change = change; 272 273 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); 274 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len); 275 NLA_PUT_U32(skb, IFLA_WEIGHT, dev->weight); 276 NLA_PUT_U8(skb, IFLA_OPERSTATE, 277 netif_running(dev) ? dev->operstate : IF_OPER_DOWN); 278 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode); 279 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); 280 281 if (dev->ifindex != dev->iflink) 282 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); 283 284 if (dev->master) 285 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex); 286 287 if (dev->qdisc_sleeping) 288 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id); 289 290 if (1) { 291 struct rtnl_link_ifmap map = { 292 .mem_start = dev->mem_start, 293 .mem_end = dev->mem_end, 294 .base_addr = dev->base_addr, 295 .irq = dev->irq, 296 .dma = dev->dma, 297 .port = dev->if_port, 298 }; 299 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map); 300 } 301 302 if (dev->addr_len) { 303 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); 304 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast); 305 } 306 307 if (dev->get_stats) { 308 struct net_device_stats *stats = dev->get_stats(dev); 309 if (stats) { 310 struct nlattr *attr; 311 312 attr = nla_reserve(skb, IFLA_STATS, 313 sizeof(struct rtnl_link_stats)); 314 if (attr == NULL) 315 goto nla_put_failure; 316 317 copy_rtnl_link_stats(nla_data(attr), stats); 318 } 319 } 320 321 if (iwbuf) 322 NLA_PUT(skb, IFLA_WIRELESS, iwbuflen, iwbuf); 323 324 return nlmsg_end(skb, nlh); 325 326 nla_put_failure: 327 return nlmsg_cancel(skb, nlh); 328 } 329 330 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 331 { 332 int idx; 333 int s_idx = cb->args[0]; 334 struct net_device *dev; 335 336 read_lock(&dev_base_lock); 337 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { 338 if (idx < s_idx) 339 continue; 340 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, RTM_NEWLINK, 341 NETLINK_CB(cb->skb).pid, 342 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0) 343 break; 344 } 345 read_unlock(&dev_base_lock); 346 cb->args[0] = idx; 347 348 return skb->len; 349 } 350 351 static struct nla_policy ifla_policy[IFLA_MAX+1] __read_mostly = { 352 [IFLA_IFNAME] = { .type = NLA_STRING }, 353 [IFLA_MAP] = { .minlen = sizeof(struct rtnl_link_ifmap) }, 354 [IFLA_MTU] = { .type = NLA_U32 }, 355 [IFLA_TXQLEN] = { .type = NLA_U32 }, 356 [IFLA_WEIGHT] = { .type = NLA_U32 }, 357 [IFLA_OPERSTATE] = { .type = NLA_U8 }, 358 [IFLA_LINKMODE] = { .type = NLA_U8 }, 359 }; 360 361 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 362 { 363 struct ifinfomsg *ifm; 364 struct net_device *dev; 365 int err, send_addr_notify = 0, modified = 0; 366 struct nlattr *tb[IFLA_MAX+1]; 367 char ifname[IFNAMSIZ]; 368 369 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 370 if (err < 0) 371 goto errout; 372 373 if (tb[IFLA_IFNAME] && 374 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ) >= IFNAMSIZ) 375 return -EINVAL; 376 377 err = -EINVAL; 378 ifm = nlmsg_data(nlh); 379 if (ifm->ifi_index >= 0) 380 dev = dev_get_by_index(ifm->ifi_index); 381 else if (tb[IFLA_IFNAME]) 382 dev = dev_get_by_name(ifname); 383 else 384 goto errout; 385 386 if (dev == NULL) { 387 err = -ENODEV; 388 goto errout; 389 } 390 391 if (tb[IFLA_ADDRESS] && 392 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len) 393 goto errout_dev; 394 395 if (tb[IFLA_BROADCAST] && 396 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len) 397 goto errout_dev; 398 399 if (tb[IFLA_MAP]) { 400 struct rtnl_link_ifmap *u_map; 401 struct ifmap k_map; 402 403 if (!dev->set_config) { 404 err = -EOPNOTSUPP; 405 goto errout_dev; 406 } 407 408 if (!netif_device_present(dev)) { 409 err = -ENODEV; 410 goto errout_dev; 411 } 412 413 u_map = nla_data(tb[IFLA_MAP]); 414 k_map.mem_start = (unsigned long) u_map->mem_start; 415 k_map.mem_end = (unsigned long) u_map->mem_end; 416 k_map.base_addr = (unsigned short) u_map->base_addr; 417 k_map.irq = (unsigned char) u_map->irq; 418 k_map.dma = (unsigned char) u_map->dma; 419 k_map.port = (unsigned char) u_map->port; 420 421 err = dev->set_config(dev, &k_map); 422 if (err < 0) 423 goto errout_dev; 424 425 modified = 1; 426 } 427 428 if (tb[IFLA_ADDRESS]) { 429 struct sockaddr *sa; 430 int len; 431 432 if (!dev->set_mac_address) { 433 err = -EOPNOTSUPP; 434 goto errout_dev; 435 } 436 437 if (!netif_device_present(dev)) { 438 err = -ENODEV; 439 goto errout_dev; 440 } 441 442 len = sizeof(sa_family_t) + dev->addr_len; 443 sa = kmalloc(len, GFP_KERNEL); 444 if (!sa) { 445 err = -ENOMEM; 446 goto errout_dev; 447 } 448 sa->sa_family = dev->type; 449 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]), 450 dev->addr_len); 451 err = dev->set_mac_address(dev, sa); 452 kfree(sa); 453 if (err) 454 goto errout_dev; 455 send_addr_notify = 1; 456 modified = 1; 457 } 458 459 if (tb[IFLA_MTU]) { 460 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 461 if (err < 0) 462 goto errout_dev; 463 modified = 1; 464 } 465 466 /* 467 * Interface selected by interface index but interface 468 * name provided implies that a name change has been 469 * requested. 470 */ 471 if (ifm->ifi_index >= 0 && ifname[0]) { 472 err = dev_change_name(dev, ifname); 473 if (err < 0) 474 goto errout_dev; 475 modified = 1; 476 } 477 478 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 479 if (tb[IFLA_WIRELESS]) { 480 /* Call Wireless Extensions. 481 * Various stuff checked in there... */ 482 err = wireless_rtnetlink_set(dev, nla_data(tb[IFLA_WIRELESS]), 483 nla_len(tb[IFLA_WIRELESS])); 484 if (err < 0) 485 goto errout_dev; 486 } 487 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 488 489 if (tb[IFLA_BROADCAST]) { 490 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len); 491 send_addr_notify = 1; 492 } 493 494 495 if (ifm->ifi_flags) 496 dev_change_flags(dev, ifm->ifi_flags); 497 498 if (tb[IFLA_TXQLEN]) 499 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]); 500 501 if (tb[IFLA_WEIGHT]) 502 dev->weight = nla_get_u32(tb[IFLA_WEIGHT]); 503 504 if (tb[IFLA_OPERSTATE]) 505 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE])); 506 507 if (tb[IFLA_LINKMODE]) { 508 write_lock_bh(&dev_base_lock); 509 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]); 510 write_unlock_bh(&dev_base_lock); 511 } 512 513 err = 0; 514 515 errout_dev: 516 if (err < 0 && modified && net_ratelimit()) 517 printk(KERN_WARNING "A link change request failed with " 518 "some changes comitted already. Interface %s may " 519 "have been left with an inconsistent configuration, " 520 "please check.\n", dev->name); 521 522 if (send_addr_notify) 523 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); 524 525 dev_put(dev); 526 errout: 527 return err; 528 } 529 530 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) 531 { 532 struct ifinfomsg *ifm; 533 struct nlattr *tb[IFLA_MAX+1]; 534 struct net_device *dev = NULL; 535 struct sk_buff *nskb; 536 char *iw_buf = NULL, *iw = NULL; 537 int iw_buf_len = 0; 538 int err, payload; 539 540 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy); 541 if (err < 0) 542 goto errout; 543 544 ifm = nlmsg_data(nlh); 545 if (ifm->ifi_index >= 0) { 546 dev = dev_get_by_index(ifm->ifi_index); 547 if (dev == NULL) 548 return -ENODEV; 549 } else 550 return -EINVAL; 551 552 553 #ifdef CONFIG_NET_WIRELESS_RTNETLINK 554 if (tb[IFLA_WIRELESS]) { 555 /* Call Wireless Extensions. We need to know the size before 556 * we can alloc. Various stuff checked in there... */ 557 err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]), 558 nla_len(tb[IFLA_WIRELESS]), 559 &iw_buf, &iw_buf_len); 560 if (err < 0) 561 goto errout; 562 563 iw += IW_EV_POINT_OFF; 564 } 565 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ 566 567 payload = NLMSG_ALIGN(sizeof(struct ifinfomsg) + 568 nla_total_size(iw_buf_len)); 569 nskb = nlmsg_new(nlmsg_total_size(payload), GFP_KERNEL); 570 if (nskb == NULL) { 571 err = -ENOBUFS; 572 goto errout; 573 } 574 575 err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK, 576 NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0); 577 if (err <= 0) { 578 kfree_skb(skb); 579 goto errout; 580 } 581 582 err = rtnl_unicast(skb, NETLINK_CB(skb).pid); 583 errout: 584 kfree(iw_buf); 585 dev_put(dev); 586 587 return err; 588 } 589 590 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb) 591 { 592 int idx; 593 int s_idx = cb->family; 594 595 if (s_idx == 0) 596 s_idx = 1; 597 for (idx=1; idx<NPROTO; idx++) { 598 int type = cb->nlh->nlmsg_type-RTM_BASE; 599 if (idx < s_idx || idx == PF_PACKET) 600 continue; 601 if (rtnetlink_links[idx] == NULL || 602 rtnetlink_links[idx][type].dumpit == NULL) 603 continue; 604 if (idx > s_idx) 605 memset(&cb->args[0], 0, sizeof(cb->args)); 606 if (rtnetlink_links[idx][type].dumpit(skb, cb)) 607 break; 608 } 609 cb->family = idx; 610 611 return skb->len; 612 } 613 614 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change) 615 { 616 struct sk_buff *skb; 617 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + 618 sizeof(struct rtnl_link_ifmap) + 619 sizeof(struct rtnl_link_stats) + 128); 620 621 skb = nlmsg_new(size, GFP_KERNEL); 622 if (!skb) 623 return; 624 625 if (rtnl_fill_ifinfo(skb, dev, NULL, 0, type, 0, 0, change, 0) < 0) { 626 kfree_skb(skb); 627 return; 628 } 629 NETLINK_CB(skb).dst_group = RTNLGRP_LINK; 630 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_KERNEL); 631 } 632 633 /* Protected by RTNL sempahore. */ 634 static struct rtattr **rta_buf; 635 static int rtattr_max; 636 637 /* Process one rtnetlink message. */ 638 639 static __inline__ int 640 rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp) 641 { 642 struct rtnetlink_link *link; 643 struct rtnetlink_link *link_tab; 644 int sz_idx, kind; 645 int min_len; 646 int family; 647 int type; 648 int err; 649 650 /* Only requests are handled by kernel now */ 651 if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) 652 return 0; 653 654 type = nlh->nlmsg_type; 655 656 /* A control message: ignore them */ 657 if (type < RTM_BASE) 658 return 0; 659 660 /* Unknown message: reply with EINVAL */ 661 if (type > RTM_MAX) 662 goto err_inval; 663 664 type -= RTM_BASE; 665 666 /* All the messages must have at least 1 byte length */ 667 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg))) 668 return 0; 669 670 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family; 671 if (family >= NPROTO) { 672 *errp = -EAFNOSUPPORT; 673 return -1; 674 } 675 676 link_tab = rtnetlink_links[family]; 677 if (link_tab == NULL) 678 link_tab = rtnetlink_links[PF_UNSPEC]; 679 link = &link_tab[type]; 680 681 sz_idx = type>>2; 682 kind = type&3; 683 684 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN)) { 685 *errp = -EPERM; 686 return -1; 687 } 688 689 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) { 690 if (link->dumpit == NULL) 691 link = &(rtnetlink_links[PF_UNSPEC][type]); 692 693 if (link->dumpit == NULL) 694 goto err_inval; 695 696 if ((*errp = netlink_dump_start(rtnl, skb, nlh, 697 link->dumpit, NULL)) != 0) { 698 return -1; 699 } 700 701 netlink_queue_skip(nlh, skb); 702 return -1; 703 } 704 705 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *))); 706 707 min_len = rtm_min[sz_idx]; 708 if (nlh->nlmsg_len < min_len) 709 goto err_inval; 710 711 if (nlh->nlmsg_len > min_len) { 712 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len); 713 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len); 714 715 while (RTA_OK(attr, attrlen)) { 716 unsigned flavor = attr->rta_type; 717 if (flavor) { 718 if (flavor > rta_max[sz_idx]) 719 goto err_inval; 720 rta_buf[flavor-1] = attr; 721 } 722 attr = RTA_NEXT(attr, attrlen); 723 } 724 } 725 726 if (link->doit == NULL) 727 link = &(rtnetlink_links[PF_UNSPEC][type]); 728 if (link->doit == NULL) 729 goto err_inval; 730 err = link->doit(skb, nlh, (void *)&rta_buf[0]); 731 732 *errp = err; 733 return err; 734 735 err_inval: 736 *errp = -EINVAL; 737 return -1; 738 } 739 740 static void rtnetlink_rcv(struct sock *sk, int len) 741 { 742 unsigned int qlen = 0; 743 744 do { 745 mutex_lock(&rtnl_mutex); 746 netlink_run_queue(sk, &qlen, &rtnetlink_rcv_msg); 747 mutex_unlock(&rtnl_mutex); 748 749 netdev_run_todo(); 750 } while (qlen); 751 } 752 753 static struct rtnetlink_link link_rtnetlink_table[RTM_NR_MSGTYPES] = 754 { 755 [RTM_GETLINK - RTM_BASE] = { .doit = rtnl_getlink, 756 .dumpit = rtnl_dump_ifinfo }, 757 [RTM_SETLINK - RTM_BASE] = { .doit = rtnl_setlink }, 758 [RTM_GETADDR - RTM_BASE] = { .dumpit = rtnl_dump_all }, 759 [RTM_GETROUTE - RTM_BASE] = { .dumpit = rtnl_dump_all }, 760 [RTM_NEWNEIGH - RTM_BASE] = { .doit = neigh_add }, 761 [RTM_DELNEIGH - RTM_BASE] = { .doit = neigh_delete }, 762 [RTM_GETNEIGH - RTM_BASE] = { .dumpit = neigh_dump_info }, 763 #ifdef CONFIG_FIB_RULES 764 [RTM_NEWRULE - RTM_BASE] = { .doit = fib_nl_newrule }, 765 [RTM_DELRULE - RTM_BASE] = { .doit = fib_nl_delrule }, 766 #endif 767 [RTM_GETRULE - RTM_BASE] = { .dumpit = rtnl_dump_all }, 768 [RTM_GETNEIGHTBL - RTM_BASE] = { .dumpit = neightbl_dump_info }, 769 [RTM_SETNEIGHTBL - RTM_BASE] = { .doit = neightbl_set }, 770 }; 771 772 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr) 773 { 774 struct net_device *dev = ptr; 775 switch (event) { 776 case NETDEV_UNREGISTER: 777 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); 778 break; 779 case NETDEV_REGISTER: 780 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); 781 break; 782 case NETDEV_UP: 783 case NETDEV_DOWN: 784 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); 785 break; 786 case NETDEV_CHANGE: 787 case NETDEV_GOING_DOWN: 788 break; 789 default: 790 rtmsg_ifinfo(RTM_NEWLINK, dev, 0); 791 break; 792 } 793 return NOTIFY_DONE; 794 } 795 796 static struct notifier_block rtnetlink_dev_notifier = { 797 .notifier_call = rtnetlink_event, 798 }; 799 800 void __init rtnetlink_init(void) 801 { 802 int i; 803 804 rtattr_max = 0; 805 for (i = 0; i < ARRAY_SIZE(rta_max); i++) 806 if (rta_max[i] > rtattr_max) 807 rtattr_max = rta_max[i]; 808 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL); 809 if (!rta_buf) 810 panic("rtnetlink_init: cannot allocate rta_buf\n"); 811 812 rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv, 813 THIS_MODULE); 814 if (rtnl == NULL) 815 panic("rtnetlink_init: cannot initialize rtnetlink\n"); 816 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV); 817 register_netdevice_notifier(&rtnetlink_dev_notifier); 818 rtnetlink_links[PF_UNSPEC] = link_rtnetlink_table; 819 rtnetlink_links[PF_PACKET] = link_rtnetlink_table; 820 } 821 822 EXPORT_SYMBOL(__rta_fill); 823 EXPORT_SYMBOL(rtattr_strlcpy); 824 EXPORT_SYMBOL(rtattr_parse); 825 EXPORT_SYMBOL(rtnetlink_links); 826 EXPORT_SYMBOL(rtnetlink_put_metrics); 827 EXPORT_SYMBOL(rtnl); 828 EXPORT_SYMBOL(rtnl_lock); 829 EXPORT_SYMBOL(rtnl_trylock); 830 EXPORT_SYMBOL(rtnl_unlock); 831 EXPORT_SYMBOL(rtnl_unicast); 832