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 * RAW - implementation of IP "raw" sockets. 7 * 8 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * 11 * Fixes: 12 * Alan Cox : verify_area() fixed up 13 * Alan Cox : ICMP error handling 14 * Alan Cox : EMSGSIZE if you send too big a packet 15 * Alan Cox : Now uses generic datagrams and shared 16 * skbuff library. No more peek crashes, 17 * no more backlogs 18 * Alan Cox : Checks sk->broadcast. 19 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 20 * Alan Cox : Raw passes ip options too 21 * Alan Cox : Setsocketopt added 22 * Alan Cox : Fixed error return for broadcasts 23 * Alan Cox : Removed wake_up calls 24 * Alan Cox : Use ttl/tos 25 * Alan Cox : Cleaned up old debugging 26 * Alan Cox : Use new kernel side addresses 27 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 28 * Alan Cox : BSD style RAW socket demultiplexing. 29 * Alan Cox : Beginnings of mrouted support. 30 * Alan Cox : Added IP_HDRINCL option. 31 * Alan Cox : Skip broadcast check if BSDism set. 32 * David S. Miller : New socket lookup architecture. 33 * 34 * This program is free software; you can redistribute it and/or 35 * modify it under the terms of the GNU General Public License 36 * as published by the Free Software Foundation; either version 37 * 2 of the License, or (at your option) any later version. 38 */ 39 40 #include <linux/types.h> 41 #include <linux/atomic.h> 42 #include <asm/byteorder.h> 43 #include <asm/current.h> 44 #include <asm/uaccess.h> 45 #include <asm/ioctls.h> 46 #include <linux/stddef.h> 47 #include <linux/slab.h> 48 #include <linux/errno.h> 49 #include <linux/aio.h> 50 #include <linux/kernel.h> 51 #include <linux/spinlock.h> 52 #include <linux/sockios.h> 53 #include <linux/socket.h> 54 #include <linux/in.h> 55 #include <linux/mroute.h> 56 #include <linux/netdevice.h> 57 #include <linux/in_route.h> 58 #include <linux/route.h> 59 #include <linux/skbuff.h> 60 #include <net/net_namespace.h> 61 #include <net/dst.h> 62 #include <net/sock.h> 63 #include <linux/ip.h> 64 #include <linux/net.h> 65 #include <net/ip.h> 66 #include <net/icmp.h> 67 #include <net/udp.h> 68 #include <net/raw.h> 69 #include <net/snmp.h> 70 #include <net/tcp_states.h> 71 #include <net/inet_common.h> 72 #include <net/checksum.h> 73 #include <net/xfrm.h> 74 #include <linux/rtnetlink.h> 75 #include <linux/proc_fs.h> 76 #include <linux/seq_file.h> 77 #include <linux/netfilter.h> 78 #include <linux/netfilter_ipv4.h> 79 #include <linux/compat.h> 80 81 static struct raw_hashinfo raw_v4_hashinfo = { 82 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 83 }; 84 85 void raw_hash_sk(struct sock *sk) 86 { 87 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 88 struct hlist_head *head; 89 90 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 91 92 write_lock_bh(&h->lock); 93 sk_add_node(sk, head); 94 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 95 write_unlock_bh(&h->lock); 96 } 97 EXPORT_SYMBOL_GPL(raw_hash_sk); 98 99 void raw_unhash_sk(struct sock *sk) 100 { 101 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 102 103 write_lock_bh(&h->lock); 104 if (sk_del_node_init(sk)) 105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 106 write_unlock_bh(&h->lock); 107 } 108 EXPORT_SYMBOL_GPL(raw_unhash_sk); 109 110 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, 111 unsigned short num, __be32 raddr, __be32 laddr, int dif) 112 { 113 struct hlist_node *node; 114 115 sk_for_each_from(sk, node) { 116 struct inet_sock *inet = inet_sk(sk); 117 118 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 119 !(inet->inet_daddr && inet->inet_daddr != raddr) && 120 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 121 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) 122 goto found; /* gotcha */ 123 } 124 sk = NULL; 125 found: 126 return sk; 127 } 128 129 /* 130 * 0 - deliver 131 * 1 - block 132 */ 133 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) 134 { 135 int type; 136 137 if (!pskb_may_pull(skb, sizeof(struct icmphdr))) 138 return 1; 139 140 type = icmp_hdr(skb)->type; 141 if (type < 32) { 142 __u32 data = raw_sk(sk)->filter.data; 143 144 return ((1 << type) & data) != 0; 145 } 146 147 /* Do not block unknown ICMP types */ 148 return 0; 149 } 150 151 /* IP input processing comes here for RAW socket delivery. 152 * Caller owns SKB, so we must make clones. 153 * 154 * RFC 1122: SHOULD pass TOS value up to the transport layer. 155 * -> It does. And not only TOS, but all IP header. 156 */ 157 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash) 158 { 159 struct sock *sk; 160 struct hlist_head *head; 161 int delivered = 0; 162 struct net *net; 163 164 read_lock(&raw_v4_hashinfo.lock); 165 head = &raw_v4_hashinfo.ht[hash]; 166 if (hlist_empty(head)) 167 goto out; 168 169 net = dev_net(skb->dev); 170 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, 171 iph->saddr, iph->daddr, 172 skb->dev->ifindex); 173 174 while (sk) { 175 delivered = 1; 176 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { 177 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 178 179 /* Not releasing hash table! */ 180 if (clone) 181 raw_rcv(sk, clone); 182 } 183 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, 184 iph->saddr, iph->daddr, 185 skb->dev->ifindex); 186 } 187 out: 188 read_unlock(&raw_v4_hashinfo.lock); 189 return delivered; 190 } 191 192 int raw_local_deliver(struct sk_buff *skb, int protocol) 193 { 194 int hash; 195 struct sock *raw_sk; 196 197 hash = protocol & (RAW_HTABLE_SIZE - 1); 198 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 199 200 /* If there maybe a raw socket we must check - if not we 201 * don't care less 202 */ 203 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) 204 raw_sk = NULL; 205 206 return raw_sk != NULL; 207 208 } 209 210 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 211 { 212 struct inet_sock *inet = inet_sk(sk); 213 const int type = icmp_hdr(skb)->type; 214 const int code = icmp_hdr(skb)->code; 215 int err = 0; 216 int harderr = 0; 217 218 /* Report error on raw socket, if: 219 1. User requested ip_recverr. 220 2. Socket is connected (otherwise the error indication 221 is useless without ip_recverr and error is hard. 222 */ 223 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 224 return; 225 226 switch (type) { 227 default: 228 case ICMP_TIME_EXCEEDED: 229 err = EHOSTUNREACH; 230 break; 231 case ICMP_SOURCE_QUENCH: 232 return; 233 case ICMP_PARAMETERPROB: 234 err = EPROTO; 235 harderr = 1; 236 break; 237 case ICMP_DEST_UNREACH: 238 err = EHOSTUNREACH; 239 if (code > NR_ICMP_UNREACH) 240 break; 241 err = icmp_err_convert[code].errno; 242 harderr = icmp_err_convert[code].fatal; 243 if (code == ICMP_FRAG_NEEDED) { 244 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 245 err = EMSGSIZE; 246 } 247 } 248 249 if (inet->recverr) { 250 const struct iphdr *iph = (const struct iphdr *)skb->data; 251 u8 *payload = skb->data + (iph->ihl << 2); 252 253 if (inet->hdrincl) 254 payload = skb->data; 255 ip_icmp_error(sk, skb, err, 0, info, payload); 256 } 257 258 if (inet->recverr || harderr) { 259 sk->sk_err = err; 260 sk->sk_error_report(sk); 261 } 262 } 263 264 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 265 { 266 int hash; 267 struct sock *raw_sk; 268 const struct iphdr *iph; 269 struct net *net; 270 271 hash = protocol & (RAW_HTABLE_SIZE - 1); 272 273 read_lock(&raw_v4_hashinfo.lock); 274 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 275 if (raw_sk != NULL) { 276 iph = (const struct iphdr *)skb->data; 277 net = dev_net(skb->dev); 278 279 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 280 iph->daddr, iph->saddr, 281 skb->dev->ifindex)) != NULL) { 282 raw_err(raw_sk, skb, info); 283 raw_sk = sk_next(raw_sk); 284 iph = (const struct iphdr *)skb->data; 285 } 286 } 287 read_unlock(&raw_v4_hashinfo.lock); 288 } 289 290 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) 291 { 292 /* Charge it to the socket. */ 293 294 if (ip_queue_rcv_skb(sk, skb) < 0) { 295 kfree_skb(skb); 296 return NET_RX_DROP; 297 } 298 299 return NET_RX_SUCCESS; 300 } 301 302 int raw_rcv(struct sock *sk, struct sk_buff *skb) 303 { 304 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 305 atomic_inc(&sk->sk_drops); 306 kfree_skb(skb); 307 return NET_RX_DROP; 308 } 309 nf_reset(skb); 310 311 skb_push(skb, skb->data - skb_network_header(skb)); 312 313 raw_rcv_skb(sk, skb); 314 return 0; 315 } 316 317 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 318 void *from, size_t length, 319 struct rtable **rtp, 320 unsigned int flags) 321 { 322 struct inet_sock *inet = inet_sk(sk); 323 struct net *net = sock_net(sk); 324 struct iphdr *iph; 325 struct sk_buff *skb; 326 unsigned int iphlen; 327 int err; 328 struct rtable *rt = *rtp; 329 330 if (length > rt->dst.dev->mtu) { 331 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 332 rt->dst.dev->mtu); 333 return -EMSGSIZE; 334 } 335 if (flags&MSG_PROBE) 336 goto out; 337 338 skb = sock_alloc_send_skb(sk, 339 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15, 340 flags & MSG_DONTWAIT, &err); 341 if (skb == NULL) 342 goto error; 343 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev)); 344 345 skb->priority = sk->sk_priority; 346 skb->mark = sk->sk_mark; 347 skb_dst_set(skb, &rt->dst); 348 *rtp = NULL; 349 350 skb_reset_network_header(skb); 351 iph = ip_hdr(skb); 352 skb_put(skb, length); 353 354 skb->ip_summed = CHECKSUM_NONE; 355 356 skb->transport_header = skb->network_header; 357 err = -EFAULT; 358 if (memcpy_fromiovecend((void *)iph, from, 0, length)) 359 goto error_free; 360 361 iphlen = iph->ihl * 4; 362 363 /* 364 * We don't want to modify the ip header, but we do need to 365 * be sure that it won't cause problems later along the network 366 * stack. Specifically we want to make sure that iph->ihl is a 367 * sane value. If ihl points beyond the length of the buffer passed 368 * in, reject the frame as invalid 369 */ 370 err = -EINVAL; 371 if (iphlen > length) 372 goto error_free; 373 374 if (iphlen >= sizeof(*iph)) { 375 if (!iph->saddr) 376 iph->saddr = fl4->saddr; 377 iph->check = 0; 378 iph->tot_len = htons(length); 379 if (!iph->id) 380 ip_select_ident(iph, &rt->dst, NULL); 381 382 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 383 } 384 if (iph->protocol == IPPROTO_ICMP) 385 icmp_out_count(net, ((struct icmphdr *) 386 skb_transport_header(skb))->type); 387 388 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL, 389 rt->dst.dev, dst_output); 390 if (err > 0) 391 err = net_xmit_errno(err); 392 if (err) 393 goto error; 394 out: 395 return 0; 396 397 error_free: 398 kfree_skb(skb); 399 error: 400 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 401 if (err == -ENOBUFS && !inet->recverr) 402 err = 0; 403 return err; 404 } 405 406 static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg) 407 { 408 struct iovec *iov; 409 u8 __user *type = NULL; 410 u8 __user *code = NULL; 411 int probed = 0; 412 unsigned int i; 413 414 if (!msg->msg_iov) 415 return 0; 416 417 for (i = 0; i < msg->msg_iovlen; i++) { 418 iov = &msg->msg_iov[i]; 419 if (!iov) 420 continue; 421 422 switch (fl4->flowi4_proto) { 423 case IPPROTO_ICMP: 424 /* check if one-byte field is readable or not. */ 425 if (iov->iov_base && iov->iov_len < 1) 426 break; 427 428 if (!type) { 429 type = iov->iov_base; 430 /* check if code field is readable or not. */ 431 if (iov->iov_len > 1) 432 code = type + 1; 433 } else if (!code) 434 code = iov->iov_base; 435 436 if (type && code) { 437 if (get_user(fl4->fl4_icmp_type, type) || 438 get_user(fl4->fl4_icmp_code, code)) 439 return -EFAULT; 440 probed = 1; 441 } 442 break; 443 default: 444 probed = 1; 445 break; 446 } 447 if (probed) 448 break; 449 } 450 return 0; 451 } 452 453 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 454 size_t len) 455 { 456 struct inet_sock *inet = inet_sk(sk); 457 struct ipcm_cookie ipc; 458 struct rtable *rt = NULL; 459 struct flowi4 fl4; 460 int free = 0; 461 __be32 daddr; 462 __be32 saddr; 463 u8 tos; 464 int err; 465 struct ip_options_data opt_copy; 466 467 err = -EMSGSIZE; 468 if (len > 0xFFFF) 469 goto out; 470 471 /* 472 * Check the flags. 473 */ 474 475 err = -EOPNOTSUPP; 476 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 477 goto out; /* compatibility */ 478 479 /* 480 * Get and verify the address. 481 */ 482 483 if (msg->msg_namelen) { 484 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; 485 err = -EINVAL; 486 if (msg->msg_namelen < sizeof(*usin)) 487 goto out; 488 if (usin->sin_family != AF_INET) { 489 static int complained; 490 if (!complained++) 491 printk(KERN_INFO "%s forgot to set AF_INET in " 492 "raw sendmsg. Fix it!\n", 493 current->comm); 494 err = -EAFNOSUPPORT; 495 if (usin->sin_family) 496 goto out; 497 } 498 daddr = usin->sin_addr.s_addr; 499 /* ANK: I did not forget to get protocol from port field. 500 * I just do not know, who uses this weirdness. 501 * IP_HDRINCL is much more convenient. 502 */ 503 } else { 504 err = -EDESTADDRREQ; 505 if (sk->sk_state != TCP_ESTABLISHED) 506 goto out; 507 daddr = inet->inet_daddr; 508 } 509 510 ipc.addr = inet->inet_saddr; 511 ipc.opt = NULL; 512 ipc.tx_flags = 0; 513 ipc.oif = sk->sk_bound_dev_if; 514 515 if (msg->msg_controllen) { 516 err = ip_cmsg_send(sock_net(sk), msg, &ipc); 517 if (err) 518 goto out; 519 if (ipc.opt) 520 free = 1; 521 } 522 523 saddr = ipc.addr; 524 ipc.addr = daddr; 525 526 if (!ipc.opt) { 527 struct ip_options_rcu *inet_opt; 528 529 rcu_read_lock(); 530 inet_opt = rcu_dereference(inet->inet_opt); 531 if (inet_opt) { 532 memcpy(&opt_copy, inet_opt, 533 sizeof(*inet_opt) + inet_opt->opt.optlen); 534 ipc.opt = &opt_copy.opt; 535 } 536 rcu_read_unlock(); 537 } 538 539 if (ipc.opt) { 540 err = -EINVAL; 541 /* Linux does not mangle headers on raw sockets, 542 * so that IP options + IP_HDRINCL is non-sense. 543 */ 544 if (inet->hdrincl) 545 goto done; 546 if (ipc.opt->opt.srr) { 547 if (!daddr) 548 goto done; 549 daddr = ipc.opt->opt.faddr; 550 } 551 } 552 tos = RT_CONN_FLAGS(sk); 553 if (msg->msg_flags & MSG_DONTROUTE) 554 tos |= RTO_ONLINK; 555 556 if (ipv4_is_multicast(daddr)) { 557 if (!ipc.oif) 558 ipc.oif = inet->mc_index; 559 if (!saddr) 560 saddr = inet->mc_addr; 561 } 562 563 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, 564 RT_SCOPE_UNIVERSE, 565 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, 566 inet_sk_flowi_flags(sk) | FLOWI_FLAG_CAN_SLEEP, 567 daddr, saddr, 0, 0); 568 569 if (!inet->hdrincl) { 570 err = raw_probe_proto_opt(&fl4, msg); 571 if (err) 572 goto done; 573 } 574 575 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); 576 rt = ip_route_output_flow(sock_net(sk), &fl4, sk); 577 if (IS_ERR(rt)) { 578 err = PTR_ERR(rt); 579 rt = NULL; 580 goto done; 581 } 582 583 err = -EACCES; 584 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 585 goto done; 586 587 if (msg->msg_flags & MSG_CONFIRM) 588 goto do_confirm; 589 back_from_confirm: 590 591 if (inet->hdrincl) 592 err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len, 593 &rt, msg->msg_flags); 594 595 else { 596 if (!ipc.addr) 597 ipc.addr = fl4.daddr; 598 lock_sock(sk); 599 err = ip_append_data(sk, &fl4, ip_generic_getfrag, 600 msg->msg_iov, len, 0, 601 &ipc, &rt, msg->msg_flags); 602 if (err) 603 ip_flush_pending_frames(sk); 604 else if (!(msg->msg_flags & MSG_MORE)) { 605 err = ip_push_pending_frames(sk, &fl4); 606 if (err == -ENOBUFS && !inet->recverr) 607 err = 0; 608 } 609 release_sock(sk); 610 } 611 done: 612 if (free) 613 kfree(ipc.opt); 614 ip_rt_put(rt); 615 616 out: 617 if (err < 0) 618 return err; 619 return len; 620 621 do_confirm: 622 dst_confirm(&rt->dst); 623 if (!(msg->msg_flags & MSG_PROBE) || len) 624 goto back_from_confirm; 625 err = 0; 626 goto done; 627 } 628 629 static void raw_close(struct sock *sk, long timeout) 630 { 631 /* 632 * Raw sockets may have direct kernel references. Kill them. 633 */ 634 ip_ra_control(sk, 0, NULL); 635 636 sk_common_release(sk); 637 } 638 639 static void raw_destroy(struct sock *sk) 640 { 641 lock_sock(sk); 642 ip_flush_pending_frames(sk); 643 release_sock(sk); 644 } 645 646 /* This gets rid of all the nasties in af_inet. -DaveM */ 647 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 648 { 649 struct inet_sock *inet = inet_sk(sk); 650 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 651 int ret = -EINVAL; 652 int chk_addr_ret; 653 654 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 655 goto out; 656 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 657 ret = -EADDRNOTAVAIL; 658 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 659 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 660 goto out; 661 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 662 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 663 inet->inet_saddr = 0; /* Use device */ 664 sk_dst_reset(sk); 665 ret = 0; 666 out: return ret; 667 } 668 669 /* 670 * This should be easy, if there is something there 671 * we return it, otherwise we block. 672 */ 673 674 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 675 size_t len, int noblock, int flags, int *addr_len) 676 { 677 struct inet_sock *inet = inet_sk(sk); 678 size_t copied = 0; 679 int err = -EOPNOTSUPP; 680 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 681 struct sk_buff *skb; 682 683 if (flags & MSG_OOB) 684 goto out; 685 686 if (addr_len) 687 *addr_len = sizeof(*sin); 688 689 if (flags & MSG_ERRQUEUE) { 690 err = ip_recv_error(sk, msg, len); 691 goto out; 692 } 693 694 skb = skb_recv_datagram(sk, flags, noblock, &err); 695 if (!skb) 696 goto out; 697 698 copied = skb->len; 699 if (len < copied) { 700 msg->msg_flags |= MSG_TRUNC; 701 copied = len; 702 } 703 704 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 705 if (err) 706 goto done; 707 708 sock_recv_ts_and_drops(msg, sk, skb); 709 710 /* Copy the address. */ 711 if (sin) { 712 sin->sin_family = AF_INET; 713 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 714 sin->sin_port = 0; 715 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 716 } 717 if (inet->cmsg_flags) 718 ip_cmsg_recv(msg, skb); 719 if (flags & MSG_TRUNC) 720 copied = skb->len; 721 done: 722 skb_free_datagram(sk, skb); 723 out: 724 if (err) 725 return err; 726 return copied; 727 } 728 729 static int raw_init(struct sock *sk) 730 { 731 struct raw_sock *rp = raw_sk(sk); 732 733 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 734 memset(&rp->filter, 0, sizeof(rp->filter)); 735 return 0; 736 } 737 738 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 739 { 740 if (optlen > sizeof(struct icmp_filter)) 741 optlen = sizeof(struct icmp_filter); 742 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 743 return -EFAULT; 744 return 0; 745 } 746 747 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 748 { 749 int len, ret = -EFAULT; 750 751 if (get_user(len, optlen)) 752 goto out; 753 ret = -EINVAL; 754 if (len < 0) 755 goto out; 756 if (len > sizeof(struct icmp_filter)) 757 len = sizeof(struct icmp_filter); 758 ret = -EFAULT; 759 if (put_user(len, optlen) || 760 copy_to_user(optval, &raw_sk(sk)->filter, len)) 761 goto out; 762 ret = 0; 763 out: return ret; 764 } 765 766 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 767 char __user *optval, unsigned int optlen) 768 { 769 if (optname == ICMP_FILTER) { 770 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 771 return -EOPNOTSUPP; 772 else 773 return raw_seticmpfilter(sk, optval, optlen); 774 } 775 return -ENOPROTOOPT; 776 } 777 778 static int raw_setsockopt(struct sock *sk, int level, int optname, 779 char __user *optval, unsigned int optlen) 780 { 781 if (level != SOL_RAW) 782 return ip_setsockopt(sk, level, optname, optval, optlen); 783 return do_raw_setsockopt(sk, level, optname, optval, optlen); 784 } 785 786 #ifdef CONFIG_COMPAT 787 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 788 char __user *optval, unsigned int optlen) 789 { 790 if (level != SOL_RAW) 791 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 792 return do_raw_setsockopt(sk, level, optname, optval, optlen); 793 } 794 #endif 795 796 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 797 char __user *optval, int __user *optlen) 798 { 799 if (optname == ICMP_FILTER) { 800 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 801 return -EOPNOTSUPP; 802 else 803 return raw_geticmpfilter(sk, optval, optlen); 804 } 805 return -ENOPROTOOPT; 806 } 807 808 static int raw_getsockopt(struct sock *sk, int level, int optname, 809 char __user *optval, int __user *optlen) 810 { 811 if (level != SOL_RAW) 812 return ip_getsockopt(sk, level, optname, optval, optlen); 813 return do_raw_getsockopt(sk, level, optname, optval, optlen); 814 } 815 816 #ifdef CONFIG_COMPAT 817 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 818 char __user *optval, int __user *optlen) 819 { 820 if (level != SOL_RAW) 821 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 822 return do_raw_getsockopt(sk, level, optname, optval, optlen); 823 } 824 #endif 825 826 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 827 { 828 switch (cmd) { 829 case SIOCOUTQ: { 830 int amount = sk_wmem_alloc_get(sk); 831 832 return put_user(amount, (int __user *)arg); 833 } 834 case SIOCINQ: { 835 struct sk_buff *skb; 836 int amount = 0; 837 838 spin_lock_bh(&sk->sk_receive_queue.lock); 839 skb = skb_peek(&sk->sk_receive_queue); 840 if (skb != NULL) 841 amount = skb->len; 842 spin_unlock_bh(&sk->sk_receive_queue.lock); 843 return put_user(amount, (int __user *)arg); 844 } 845 846 default: 847 #ifdef CONFIG_IP_MROUTE 848 return ipmr_ioctl(sk, cmd, (void __user *)arg); 849 #else 850 return -ENOIOCTLCMD; 851 #endif 852 } 853 } 854 855 #ifdef CONFIG_COMPAT 856 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 857 { 858 switch (cmd) { 859 case SIOCOUTQ: 860 case SIOCINQ: 861 return -ENOIOCTLCMD; 862 default: 863 #ifdef CONFIG_IP_MROUTE 864 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 865 #else 866 return -ENOIOCTLCMD; 867 #endif 868 } 869 } 870 #endif 871 872 struct proto raw_prot = { 873 .name = "RAW", 874 .owner = THIS_MODULE, 875 .close = raw_close, 876 .destroy = raw_destroy, 877 .connect = ip4_datagram_connect, 878 .disconnect = udp_disconnect, 879 .ioctl = raw_ioctl, 880 .init = raw_init, 881 .setsockopt = raw_setsockopt, 882 .getsockopt = raw_getsockopt, 883 .sendmsg = raw_sendmsg, 884 .recvmsg = raw_recvmsg, 885 .bind = raw_bind, 886 .backlog_rcv = raw_rcv_skb, 887 .hash = raw_hash_sk, 888 .unhash = raw_unhash_sk, 889 .obj_size = sizeof(struct raw_sock), 890 .h.raw_hash = &raw_v4_hashinfo, 891 #ifdef CONFIG_COMPAT 892 .compat_setsockopt = compat_raw_setsockopt, 893 .compat_getsockopt = compat_raw_getsockopt, 894 .compat_ioctl = compat_raw_ioctl, 895 #endif 896 }; 897 898 #ifdef CONFIG_PROC_FS 899 static struct sock *raw_get_first(struct seq_file *seq) 900 { 901 struct sock *sk; 902 struct raw_iter_state *state = raw_seq_private(seq); 903 904 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 905 ++state->bucket) { 906 struct hlist_node *node; 907 908 sk_for_each(sk, node, &state->h->ht[state->bucket]) 909 if (sock_net(sk) == seq_file_net(seq)) 910 goto found; 911 } 912 sk = NULL; 913 found: 914 return sk; 915 } 916 917 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 918 { 919 struct raw_iter_state *state = raw_seq_private(seq); 920 921 do { 922 sk = sk_next(sk); 923 try_again: 924 ; 925 } while (sk && sock_net(sk) != seq_file_net(seq)); 926 927 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 928 sk = sk_head(&state->h->ht[state->bucket]); 929 goto try_again; 930 } 931 return sk; 932 } 933 934 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 935 { 936 struct sock *sk = raw_get_first(seq); 937 938 if (sk) 939 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 940 --pos; 941 return pos ? NULL : sk; 942 } 943 944 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 945 { 946 struct raw_iter_state *state = raw_seq_private(seq); 947 948 read_lock(&state->h->lock); 949 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 950 } 951 EXPORT_SYMBOL_GPL(raw_seq_start); 952 953 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 954 { 955 struct sock *sk; 956 957 if (v == SEQ_START_TOKEN) 958 sk = raw_get_first(seq); 959 else 960 sk = raw_get_next(seq, v); 961 ++*pos; 962 return sk; 963 } 964 EXPORT_SYMBOL_GPL(raw_seq_next); 965 966 void raw_seq_stop(struct seq_file *seq, void *v) 967 { 968 struct raw_iter_state *state = raw_seq_private(seq); 969 970 read_unlock(&state->h->lock); 971 } 972 EXPORT_SYMBOL_GPL(raw_seq_stop); 973 974 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 975 { 976 struct inet_sock *inet = inet_sk(sp); 977 __be32 dest = inet->inet_daddr, 978 src = inet->inet_rcv_saddr; 979 __u16 destp = 0, 980 srcp = inet->inet_num; 981 982 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 983 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 984 i, src, srcp, dest, destp, sp->sk_state, 985 sk_wmem_alloc_get(sp), 986 sk_rmem_alloc_get(sp), 987 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 988 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 989 } 990 991 static int raw_seq_show(struct seq_file *seq, void *v) 992 { 993 if (v == SEQ_START_TOKEN) 994 seq_printf(seq, " sl local_address rem_address st tx_queue " 995 "rx_queue tr tm->when retrnsmt uid timeout " 996 "inode ref pointer drops\n"); 997 else 998 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 999 return 0; 1000 } 1001 1002 static const struct seq_operations raw_seq_ops = { 1003 .start = raw_seq_start, 1004 .next = raw_seq_next, 1005 .stop = raw_seq_stop, 1006 .show = raw_seq_show, 1007 }; 1008 1009 int raw_seq_open(struct inode *ino, struct file *file, 1010 struct raw_hashinfo *h, const struct seq_operations *ops) 1011 { 1012 int err; 1013 struct raw_iter_state *i; 1014 1015 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 1016 if (err < 0) 1017 return err; 1018 1019 i = raw_seq_private((struct seq_file *)file->private_data); 1020 i->h = h; 1021 return 0; 1022 } 1023 EXPORT_SYMBOL_GPL(raw_seq_open); 1024 1025 static int raw_v4_seq_open(struct inode *inode, struct file *file) 1026 { 1027 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 1028 } 1029 1030 static const struct file_operations raw_seq_fops = { 1031 .owner = THIS_MODULE, 1032 .open = raw_v4_seq_open, 1033 .read = seq_read, 1034 .llseek = seq_lseek, 1035 .release = seq_release_net, 1036 }; 1037 1038 static __net_init int raw_init_net(struct net *net) 1039 { 1040 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) 1041 return -ENOMEM; 1042 1043 return 0; 1044 } 1045 1046 static __net_exit void raw_exit_net(struct net *net) 1047 { 1048 proc_net_remove(net, "raw"); 1049 } 1050 1051 static __net_initdata struct pernet_operations raw_net_ops = { 1052 .init = raw_init_net, 1053 .exit = raw_exit_net, 1054 }; 1055 1056 int __init raw_proc_init(void) 1057 { 1058 return register_pernet_subsys(&raw_net_ops); 1059 } 1060 1061 void __init raw_proc_exit(void) 1062 { 1063 unregister_pernet_subsys(&raw_net_ops); 1064 } 1065 #endif /* CONFIG_PROC_FS */ 1066