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 * Version: $Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $ 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * 13 * Fixes: 14 * Alan Cox : verify_area() fixed up 15 * Alan Cox : ICMP error handling 16 * Alan Cox : EMSGSIZE if you send too big a packet 17 * Alan Cox : Now uses generic datagrams and shared 18 * skbuff library. No more peek crashes, 19 * no more backlogs 20 * Alan Cox : Checks sk->broadcast. 21 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 22 * Alan Cox : Raw passes ip options too 23 * Alan Cox : Setsocketopt added 24 * Alan Cox : Fixed error return for broadcasts 25 * Alan Cox : Removed wake_up calls 26 * Alan Cox : Use ttl/tos 27 * Alan Cox : Cleaned up old debugging 28 * Alan Cox : Use new kernel side addresses 29 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 30 * Alan Cox : BSD style RAW socket demultiplexing. 31 * Alan Cox : Beginnings of mrouted support. 32 * Alan Cox : Added IP_HDRINCL option. 33 * Alan Cox : Skip broadcast check if BSDism set. 34 * David S. Miller : New socket lookup architecture. 35 * 36 * This program is free software; you can redistribute it and/or 37 * modify it under the terms of the GNU General Public License 38 * as published by the Free Software Foundation; either version 39 * 2 of the License, or (at your option) any later version. 40 */ 41 42 #include <linux/types.h> 43 #include <asm/atomic.h> 44 #include <asm/byteorder.h> 45 #include <asm/current.h> 46 #include <asm/uaccess.h> 47 #include <asm/ioctls.h> 48 #include <linux/stddef.h> 49 #include <linux/slab.h> 50 #include <linux/errno.h> 51 #include <linux/aio.h> 52 #include <linux/kernel.h> 53 #include <linux/spinlock.h> 54 #include <linux/sockios.h> 55 #include <linux/socket.h> 56 #include <linux/in.h> 57 #include <linux/mroute.h> 58 #include <linux/netdevice.h> 59 #include <linux/in_route.h> 60 #include <linux/route.h> 61 #include <linux/skbuff.h> 62 #include <net/dst.h> 63 #include <net/sock.h> 64 #include <linux/gfp.h> 65 #include <linux/ip.h> 66 #include <linux/net.h> 67 #include <net/ip.h> 68 #include <net/icmp.h> 69 #include <net/udp.h> 70 #include <net/raw.h> 71 #include <net/snmp.h> 72 #include <net/tcp_states.h> 73 #include <net/inet_common.h> 74 #include <net/checksum.h> 75 #include <net/xfrm.h> 76 #include <linux/rtnetlink.h> 77 #include <linux/proc_fs.h> 78 #include <linux/seq_file.h> 79 #include <linux/netfilter.h> 80 #include <linux/netfilter_ipv4.h> 81 82 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE]; 83 DEFINE_RWLOCK(raw_v4_lock); 84 85 static void raw_v4_hash(struct sock *sk) 86 { 87 struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num & 88 (RAWV4_HTABLE_SIZE - 1)]; 89 90 write_lock_bh(&raw_v4_lock); 91 sk_add_node(sk, head); 92 sock_prot_inc_use(sk->sk_prot); 93 write_unlock_bh(&raw_v4_lock); 94 } 95 96 static void raw_v4_unhash(struct sock *sk) 97 { 98 write_lock_bh(&raw_v4_lock); 99 if (sk_del_node_init(sk)) 100 sock_prot_dec_use(sk->sk_prot); 101 write_unlock_bh(&raw_v4_lock); 102 } 103 104 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num, 105 __be32 raddr, __be32 laddr, 106 int dif) 107 { 108 struct hlist_node *node; 109 110 sk_for_each_from(sk, node) { 111 struct inet_sock *inet = inet_sk(sk); 112 113 if (inet->num == num && 114 !(inet->daddr && inet->daddr != raddr) && 115 !(inet->rcv_saddr && inet->rcv_saddr != laddr) && 116 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) 117 goto found; /* gotcha */ 118 } 119 sk = NULL; 120 found: 121 return sk; 122 } 123 124 /* 125 * 0 - deliver 126 * 1 - block 127 */ 128 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) 129 { 130 int type; 131 132 if (!pskb_may_pull(skb, sizeof(struct icmphdr))) 133 return 1; 134 135 type = icmp_hdr(skb)->type; 136 if (type < 32) { 137 __u32 data = raw_sk(sk)->filter.data; 138 139 return ((1 << type) & data) != 0; 140 } 141 142 /* Do not block unknown ICMP types */ 143 return 0; 144 } 145 146 /* IP input processing comes here for RAW socket delivery. 147 * Caller owns SKB, so we must make clones. 148 * 149 * RFC 1122: SHOULD pass TOS value up to the transport layer. 150 * -> It does. And not only TOS, but all IP header. 151 */ 152 int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) 153 { 154 struct sock *sk; 155 struct hlist_head *head; 156 int delivered = 0; 157 158 read_lock(&raw_v4_lock); 159 head = &raw_v4_htable[hash]; 160 if (hlist_empty(head)) 161 goto out; 162 sk = __raw_v4_lookup(__sk_head(head), iph->protocol, 163 iph->saddr, iph->daddr, 164 skb->dev->ifindex); 165 166 while (sk) { 167 delivered = 1; 168 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { 169 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 170 171 /* Not releasing hash table! */ 172 if (clone) 173 raw_rcv(sk, clone); 174 } 175 sk = __raw_v4_lookup(sk_next(sk), iph->protocol, 176 iph->saddr, iph->daddr, 177 skb->dev->ifindex); 178 } 179 out: 180 read_unlock(&raw_v4_lock); 181 return delivered; 182 } 183 184 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info) 185 { 186 struct inet_sock *inet = inet_sk(sk); 187 const int type = icmp_hdr(skb)->type; 188 const int code = icmp_hdr(skb)->code; 189 int err = 0; 190 int harderr = 0; 191 192 /* Report error on raw socket, if: 193 1. User requested ip_recverr. 194 2. Socket is connected (otherwise the error indication 195 is useless without ip_recverr and error is hard. 196 */ 197 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 198 return; 199 200 switch (type) { 201 default: 202 case ICMP_TIME_EXCEEDED: 203 err = EHOSTUNREACH; 204 break; 205 case ICMP_SOURCE_QUENCH: 206 return; 207 case ICMP_PARAMETERPROB: 208 err = EPROTO; 209 harderr = 1; 210 break; 211 case ICMP_DEST_UNREACH: 212 err = EHOSTUNREACH; 213 if (code > NR_ICMP_UNREACH) 214 break; 215 err = icmp_err_convert[code].errno; 216 harderr = icmp_err_convert[code].fatal; 217 if (code == ICMP_FRAG_NEEDED) { 218 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 219 err = EMSGSIZE; 220 } 221 } 222 223 if (inet->recverr) { 224 struct iphdr *iph = (struct iphdr*)skb->data; 225 u8 *payload = skb->data + (iph->ihl << 2); 226 227 if (inet->hdrincl) 228 payload = skb->data; 229 ip_icmp_error(sk, skb, err, 0, info, payload); 230 } 231 232 if (inet->recverr || harderr) { 233 sk->sk_err = err; 234 sk->sk_error_report(sk); 235 } 236 } 237 238 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) 239 { 240 /* Charge it to the socket. */ 241 242 if (sock_queue_rcv_skb(sk, skb) < 0) { 243 /* FIXME: increment a raw drops counter here */ 244 kfree_skb(skb); 245 return NET_RX_DROP; 246 } 247 248 return NET_RX_SUCCESS; 249 } 250 251 int raw_rcv(struct sock *sk, struct sk_buff *skb) 252 { 253 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 254 kfree_skb(skb); 255 return NET_RX_DROP; 256 } 257 nf_reset(skb); 258 259 skb_push(skb, skb->data - skb_network_header(skb)); 260 261 raw_rcv_skb(sk, skb); 262 return 0; 263 } 264 265 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, 266 struct rtable *rt, 267 unsigned int flags) 268 { 269 struct inet_sock *inet = inet_sk(sk); 270 int hh_len; 271 struct iphdr *iph; 272 struct sk_buff *skb; 273 int err; 274 275 if (length > rt->u.dst.dev->mtu) { 276 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, 277 rt->u.dst.dev->mtu); 278 return -EMSGSIZE; 279 } 280 if (flags&MSG_PROBE) 281 goto out; 282 283 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 284 285 skb = sock_alloc_send_skb(sk, length+hh_len+15, 286 flags&MSG_DONTWAIT, &err); 287 if (skb == NULL) 288 goto error; 289 skb_reserve(skb, hh_len); 290 291 skb->priority = sk->sk_priority; 292 skb->dst = dst_clone(&rt->u.dst); 293 294 skb_reset_network_header(skb); 295 iph = ip_hdr(skb); 296 skb_put(skb, length); 297 298 skb->ip_summed = CHECKSUM_NONE; 299 300 skb->transport_header = skb->network_header; 301 err = memcpy_fromiovecend((void *)iph, from, 0, length); 302 if (err) 303 goto error_fault; 304 305 /* We don't modify invalid header */ 306 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { 307 if (!iph->saddr) 308 iph->saddr = rt->rt_src; 309 iph->check = 0; 310 iph->tot_len = htons(length); 311 if (!iph->id) 312 ip_select_ident(iph, &rt->u.dst, NULL); 313 314 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 315 } 316 317 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 318 dst_output); 319 if (err > 0) 320 err = inet->recverr ? net_xmit_errno(err) : 0; 321 if (err) 322 goto error; 323 out: 324 return 0; 325 326 error_fault: 327 err = -EFAULT; 328 kfree_skb(skb); 329 error: 330 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 331 return err; 332 } 333 334 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 335 { 336 struct iovec *iov; 337 u8 __user *type = NULL; 338 u8 __user *code = NULL; 339 int probed = 0; 340 unsigned int i; 341 342 if (!msg->msg_iov) 343 return 0; 344 345 for (i = 0; i < msg->msg_iovlen; i++) { 346 iov = &msg->msg_iov[i]; 347 if (!iov) 348 continue; 349 350 switch (fl->proto) { 351 case IPPROTO_ICMP: 352 /* check if one-byte field is readable or not. */ 353 if (iov->iov_base && iov->iov_len < 1) 354 break; 355 356 if (!type) { 357 type = iov->iov_base; 358 /* check if code field is readable or not. */ 359 if (iov->iov_len > 1) 360 code = type + 1; 361 } else if (!code) 362 code = iov->iov_base; 363 364 if (type && code) { 365 if (get_user(fl->fl_icmp_type, type) || 366 get_user(fl->fl_icmp_code, code)) 367 return -EFAULT; 368 probed = 1; 369 } 370 break; 371 default: 372 probed = 1; 373 break; 374 } 375 if (probed) 376 break; 377 } 378 return 0; 379 } 380 381 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 382 size_t len) 383 { 384 struct inet_sock *inet = inet_sk(sk); 385 struct ipcm_cookie ipc; 386 struct rtable *rt = NULL; 387 int free = 0; 388 __be32 daddr; 389 __be32 saddr; 390 u8 tos; 391 int err; 392 393 err = -EMSGSIZE; 394 if (len > 0xFFFF) 395 goto out; 396 397 /* 398 * Check the flags. 399 */ 400 401 err = -EOPNOTSUPP; 402 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 403 goto out; /* compatibility */ 404 405 /* 406 * Get and verify the address. 407 */ 408 409 if (msg->msg_namelen) { 410 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; 411 err = -EINVAL; 412 if (msg->msg_namelen < sizeof(*usin)) 413 goto out; 414 if (usin->sin_family != AF_INET) { 415 static int complained; 416 if (!complained++) 417 printk(KERN_INFO "%s forgot to set AF_INET in " 418 "raw sendmsg. Fix it!\n", 419 current->comm); 420 err = -EAFNOSUPPORT; 421 if (usin->sin_family) 422 goto out; 423 } 424 daddr = usin->sin_addr.s_addr; 425 /* ANK: I did not forget to get protocol from port field. 426 * I just do not know, who uses this weirdness. 427 * IP_HDRINCL is much more convenient. 428 */ 429 } else { 430 err = -EDESTADDRREQ; 431 if (sk->sk_state != TCP_ESTABLISHED) 432 goto out; 433 daddr = inet->daddr; 434 } 435 436 ipc.addr = inet->saddr; 437 ipc.opt = NULL; 438 ipc.oif = sk->sk_bound_dev_if; 439 440 if (msg->msg_controllen) { 441 err = ip_cmsg_send(msg, &ipc); 442 if (err) 443 goto out; 444 if (ipc.opt) 445 free = 1; 446 } 447 448 saddr = ipc.addr; 449 ipc.addr = daddr; 450 451 if (!ipc.opt) 452 ipc.opt = inet->opt; 453 454 if (ipc.opt) { 455 err = -EINVAL; 456 /* Linux does not mangle headers on raw sockets, 457 * so that IP options + IP_HDRINCL is non-sense. 458 */ 459 if (inet->hdrincl) 460 goto done; 461 if (ipc.opt->srr) { 462 if (!daddr) 463 goto done; 464 daddr = ipc.opt->faddr; 465 } 466 } 467 tos = RT_CONN_FLAGS(sk); 468 if (msg->msg_flags & MSG_DONTROUTE) 469 tos |= RTO_ONLINK; 470 471 if (MULTICAST(daddr)) { 472 if (!ipc.oif) 473 ipc.oif = inet->mc_index; 474 if (!saddr) 475 saddr = inet->mc_addr; 476 } 477 478 { 479 struct flowi fl = { .oif = ipc.oif, 480 .nl_u = { .ip4_u = 481 { .daddr = daddr, 482 .saddr = saddr, 483 .tos = tos } }, 484 .proto = inet->hdrincl ? IPPROTO_RAW : 485 sk->sk_protocol, 486 }; 487 if (!inet->hdrincl) { 488 err = raw_probe_proto_opt(&fl, msg); 489 if (err) 490 goto done; 491 } 492 493 security_sk_classify_flow(sk, &fl); 494 err = ip_route_output_flow(&rt, &fl, sk, 1); 495 } 496 if (err) 497 goto done; 498 499 err = -EACCES; 500 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 501 goto done; 502 503 if (msg->msg_flags & MSG_CONFIRM) 504 goto do_confirm; 505 back_from_confirm: 506 507 if (inet->hdrincl) 508 err = raw_send_hdrinc(sk, msg->msg_iov, len, 509 rt, msg->msg_flags); 510 511 else { 512 if (!ipc.addr) 513 ipc.addr = rt->rt_dst; 514 lock_sock(sk); 515 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 516 &ipc, rt, msg->msg_flags); 517 if (err) 518 ip_flush_pending_frames(sk); 519 else if (!(msg->msg_flags & MSG_MORE)) 520 err = ip_push_pending_frames(sk); 521 release_sock(sk); 522 } 523 done: 524 if (free) 525 kfree(ipc.opt); 526 ip_rt_put(rt); 527 528 out: 529 if (err < 0) 530 return err; 531 return len; 532 533 do_confirm: 534 dst_confirm(&rt->u.dst); 535 if (!(msg->msg_flags & MSG_PROBE) || len) 536 goto back_from_confirm; 537 err = 0; 538 goto done; 539 } 540 541 static void raw_close(struct sock *sk, long timeout) 542 { 543 /* 544 * Raw sockets may have direct kernel refereneces. Kill them. 545 */ 546 ip_ra_control(sk, 0, NULL); 547 548 sk_common_release(sk); 549 } 550 551 /* This gets rid of all the nasties in af_inet. -DaveM */ 552 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 553 { 554 struct inet_sock *inet = inet_sk(sk); 555 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 556 int ret = -EINVAL; 557 int chk_addr_ret; 558 559 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 560 goto out; 561 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 562 ret = -EADDRNOTAVAIL; 563 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 564 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 565 goto out; 566 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 567 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 568 inet->saddr = 0; /* Use device */ 569 sk_dst_reset(sk); 570 ret = 0; 571 out: return ret; 572 } 573 574 /* 575 * This should be easy, if there is something there 576 * we return it, otherwise we block. 577 */ 578 579 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 580 size_t len, int noblock, int flags, int *addr_len) 581 { 582 struct inet_sock *inet = inet_sk(sk); 583 size_t copied = 0; 584 int err = -EOPNOTSUPP; 585 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 586 struct sk_buff *skb; 587 588 if (flags & MSG_OOB) 589 goto out; 590 591 if (addr_len) 592 *addr_len = sizeof(*sin); 593 594 if (flags & MSG_ERRQUEUE) { 595 err = ip_recv_error(sk, msg, len); 596 goto out; 597 } 598 599 skb = skb_recv_datagram(sk, flags, noblock, &err); 600 if (!skb) 601 goto out; 602 603 copied = skb->len; 604 if (len < copied) { 605 msg->msg_flags |= MSG_TRUNC; 606 copied = len; 607 } 608 609 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 610 if (err) 611 goto done; 612 613 sock_recv_timestamp(msg, sk, skb); 614 615 /* Copy the address. */ 616 if (sin) { 617 sin->sin_family = AF_INET; 618 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 619 sin->sin_port = 0; 620 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 621 } 622 if (inet->cmsg_flags) 623 ip_cmsg_recv(msg, skb); 624 if (flags & MSG_TRUNC) 625 copied = skb->len; 626 done: 627 skb_free_datagram(sk, skb); 628 out: 629 if (err) 630 return err; 631 return copied; 632 } 633 634 static int raw_init(struct sock *sk) 635 { 636 struct raw_sock *rp = raw_sk(sk); 637 638 if (inet_sk(sk)->num == IPPROTO_ICMP) 639 memset(&rp->filter, 0, sizeof(rp->filter)); 640 return 0; 641 } 642 643 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 644 { 645 if (optlen > sizeof(struct icmp_filter)) 646 optlen = sizeof(struct icmp_filter); 647 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 648 return -EFAULT; 649 return 0; 650 } 651 652 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 653 { 654 int len, ret = -EFAULT; 655 656 if (get_user(len, optlen)) 657 goto out; 658 ret = -EINVAL; 659 if (len < 0) 660 goto out; 661 if (len > sizeof(struct icmp_filter)) 662 len = sizeof(struct icmp_filter); 663 ret = -EFAULT; 664 if (put_user(len, optlen) || 665 copy_to_user(optval, &raw_sk(sk)->filter, len)) 666 goto out; 667 ret = 0; 668 out: return ret; 669 } 670 671 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 672 char __user *optval, int optlen) 673 { 674 if (optname == ICMP_FILTER) { 675 if (inet_sk(sk)->num != IPPROTO_ICMP) 676 return -EOPNOTSUPP; 677 else 678 return raw_seticmpfilter(sk, optval, optlen); 679 } 680 return -ENOPROTOOPT; 681 } 682 683 static int raw_setsockopt(struct sock *sk, int level, int optname, 684 char __user *optval, int optlen) 685 { 686 if (level != SOL_RAW) 687 return ip_setsockopt(sk, level, optname, optval, optlen); 688 return do_raw_setsockopt(sk, level, optname, optval, optlen); 689 } 690 691 #ifdef CONFIG_COMPAT 692 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 693 char __user *optval, int optlen) 694 { 695 if (level != SOL_RAW) 696 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 697 return do_raw_setsockopt(sk, level, optname, optval, optlen); 698 } 699 #endif 700 701 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 702 char __user *optval, int __user *optlen) 703 { 704 if (optname == ICMP_FILTER) { 705 if (inet_sk(sk)->num != IPPROTO_ICMP) 706 return -EOPNOTSUPP; 707 else 708 return raw_geticmpfilter(sk, optval, optlen); 709 } 710 return -ENOPROTOOPT; 711 } 712 713 static int raw_getsockopt(struct sock *sk, int level, int optname, 714 char __user *optval, int __user *optlen) 715 { 716 if (level != SOL_RAW) 717 return ip_getsockopt(sk, level, optname, optval, optlen); 718 return do_raw_getsockopt(sk, level, optname, optval, optlen); 719 } 720 721 #ifdef CONFIG_COMPAT 722 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 723 char __user *optval, int __user *optlen) 724 { 725 if (level != SOL_RAW) 726 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 727 return do_raw_getsockopt(sk, level, optname, optval, optlen); 728 } 729 #endif 730 731 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 732 { 733 switch (cmd) { 734 case SIOCOUTQ: { 735 int amount = atomic_read(&sk->sk_wmem_alloc); 736 return put_user(amount, (int __user *)arg); 737 } 738 case SIOCINQ: { 739 struct sk_buff *skb; 740 int amount = 0; 741 742 spin_lock_bh(&sk->sk_receive_queue.lock); 743 skb = skb_peek(&sk->sk_receive_queue); 744 if (skb != NULL) 745 amount = skb->len; 746 spin_unlock_bh(&sk->sk_receive_queue.lock); 747 return put_user(amount, (int __user *)arg); 748 } 749 750 default: 751 #ifdef CONFIG_IP_MROUTE 752 return ipmr_ioctl(sk, cmd, (void __user *)arg); 753 #else 754 return -ENOIOCTLCMD; 755 #endif 756 } 757 } 758 759 struct proto raw_prot = { 760 .name = "RAW", 761 .owner = THIS_MODULE, 762 .close = raw_close, 763 .connect = ip4_datagram_connect, 764 .disconnect = udp_disconnect, 765 .ioctl = raw_ioctl, 766 .init = raw_init, 767 .setsockopt = raw_setsockopt, 768 .getsockopt = raw_getsockopt, 769 .sendmsg = raw_sendmsg, 770 .recvmsg = raw_recvmsg, 771 .bind = raw_bind, 772 .backlog_rcv = raw_rcv_skb, 773 .hash = raw_v4_hash, 774 .unhash = raw_v4_unhash, 775 .obj_size = sizeof(struct raw_sock), 776 #ifdef CONFIG_COMPAT 777 .compat_setsockopt = compat_raw_setsockopt, 778 .compat_getsockopt = compat_raw_getsockopt, 779 #endif 780 }; 781 782 #ifdef CONFIG_PROC_FS 783 struct raw_iter_state { 784 int bucket; 785 }; 786 787 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) 788 789 static struct sock *raw_get_first(struct seq_file *seq) 790 { 791 struct sock *sk; 792 struct raw_iter_state* state = raw_seq_private(seq); 793 794 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { 795 struct hlist_node *node; 796 797 sk_for_each(sk, node, &raw_v4_htable[state->bucket]) 798 if (sk->sk_family == PF_INET) 799 goto found; 800 } 801 sk = NULL; 802 found: 803 return sk; 804 } 805 806 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 807 { 808 struct raw_iter_state* state = raw_seq_private(seq); 809 810 do { 811 sk = sk_next(sk); 812 try_again: 813 ; 814 } while (sk && sk->sk_family != PF_INET); 815 816 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { 817 sk = sk_head(&raw_v4_htable[state->bucket]); 818 goto try_again; 819 } 820 return sk; 821 } 822 823 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 824 { 825 struct sock *sk = raw_get_first(seq); 826 827 if (sk) 828 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 829 --pos; 830 return pos ? NULL : sk; 831 } 832 833 static void *raw_seq_start(struct seq_file *seq, loff_t *pos) 834 { 835 read_lock(&raw_v4_lock); 836 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 837 } 838 839 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 840 { 841 struct sock *sk; 842 843 if (v == SEQ_START_TOKEN) 844 sk = raw_get_first(seq); 845 else 846 sk = raw_get_next(seq, v); 847 ++*pos; 848 return sk; 849 } 850 851 static void raw_seq_stop(struct seq_file *seq, void *v) 852 { 853 read_unlock(&raw_v4_lock); 854 } 855 856 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) 857 { 858 struct inet_sock *inet = inet_sk(sp); 859 __be32 dest = inet->daddr, 860 src = inet->rcv_saddr; 861 __u16 destp = 0, 862 srcp = inet->num; 863 864 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 865 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 866 i, src, srcp, dest, destp, sp->sk_state, 867 atomic_read(&sp->sk_wmem_alloc), 868 atomic_read(&sp->sk_rmem_alloc), 869 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 870 atomic_read(&sp->sk_refcnt), sp); 871 return tmpbuf; 872 } 873 874 static int raw_seq_show(struct seq_file *seq, void *v) 875 { 876 char tmpbuf[129]; 877 878 if (v == SEQ_START_TOKEN) 879 seq_printf(seq, "%-127s\n", 880 " sl local_address rem_address st tx_queue " 881 "rx_queue tr tm->when retrnsmt uid timeout " 882 "inode"); 883 else { 884 struct raw_iter_state *state = raw_seq_private(seq); 885 886 seq_printf(seq, "%-127s\n", 887 get_raw_sock(v, tmpbuf, state->bucket)); 888 } 889 return 0; 890 } 891 892 static const struct seq_operations raw_seq_ops = { 893 .start = raw_seq_start, 894 .next = raw_seq_next, 895 .stop = raw_seq_stop, 896 .show = raw_seq_show, 897 }; 898 899 static int raw_seq_open(struct inode *inode, struct file *file) 900 { 901 struct seq_file *seq; 902 int rc = -ENOMEM; 903 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 904 905 if (!s) 906 goto out; 907 rc = seq_open(file, &raw_seq_ops); 908 if (rc) 909 goto out_kfree; 910 911 seq = file->private_data; 912 seq->private = s; 913 memset(s, 0, sizeof(*s)); 914 out: 915 return rc; 916 out_kfree: 917 kfree(s); 918 goto out; 919 } 920 921 static const struct file_operations raw_seq_fops = { 922 .owner = THIS_MODULE, 923 .open = raw_seq_open, 924 .read = seq_read, 925 .llseek = seq_lseek, 926 .release = seq_release_private, 927 }; 928 929 int __init raw_proc_init(void) 930 { 931 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) 932 return -ENOMEM; 933 return 0; 934 } 935 936 void __init raw_proc_exit(void) 937 { 938 proc_net_remove("raw"); 939 } 940 #endif /* CONFIG_PROC_FS */ 941