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 = skb->h.icmph->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 int type = skb->h.icmph->type; 188 int code = skb->h.icmph->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->nh.raw); 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->nh.iph = iph = (struct iphdr *)skb_put(skb, length); 295 296 skb->ip_summed = CHECKSUM_NONE; 297 298 skb->h.raw = skb->nh.raw; 299 err = memcpy_fromiovecend((void *)iph, from, 0, length); 300 if (err) 301 goto error_fault; 302 303 /* We don't modify invalid header */ 304 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { 305 if (!iph->saddr) 306 iph->saddr = rt->rt_src; 307 iph->check = 0; 308 iph->tot_len = htons(length); 309 if (!iph->id) 310 ip_select_ident(iph, &rt->u.dst, NULL); 311 312 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 313 } 314 315 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 316 dst_output); 317 if (err > 0) 318 err = inet->recverr ? net_xmit_errno(err) : 0; 319 if (err) 320 goto error; 321 out: 322 return 0; 323 324 error_fault: 325 err = -EFAULT; 326 kfree_skb(skb); 327 error: 328 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 329 return err; 330 } 331 332 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 333 { 334 struct iovec *iov; 335 u8 __user *type = NULL; 336 u8 __user *code = NULL; 337 int probed = 0; 338 unsigned int i; 339 340 if (!msg->msg_iov) 341 return 0; 342 343 for (i = 0; i < msg->msg_iovlen; i++) { 344 iov = &msg->msg_iov[i]; 345 if (!iov) 346 continue; 347 348 switch (fl->proto) { 349 case IPPROTO_ICMP: 350 /* check if one-byte field is readable or not. */ 351 if (iov->iov_base && iov->iov_len < 1) 352 break; 353 354 if (!type) { 355 type = iov->iov_base; 356 /* check if code field is readable or not. */ 357 if (iov->iov_len > 1) 358 code = type + 1; 359 } else if (!code) 360 code = iov->iov_base; 361 362 if (type && code) { 363 if (get_user(fl->fl_icmp_type, type) || 364 get_user(fl->fl_icmp_code, code)) 365 return -EFAULT; 366 probed = 1; 367 } 368 break; 369 default: 370 probed = 1; 371 break; 372 } 373 if (probed) 374 break; 375 } 376 return 0; 377 } 378 379 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 380 size_t len) 381 { 382 struct inet_sock *inet = inet_sk(sk); 383 struct ipcm_cookie ipc; 384 struct rtable *rt = NULL; 385 int free = 0; 386 __be32 daddr; 387 __be32 saddr; 388 u8 tos; 389 int err; 390 391 err = -EMSGSIZE; 392 if (len > 0xFFFF) 393 goto out; 394 395 /* 396 * Check the flags. 397 */ 398 399 err = -EOPNOTSUPP; 400 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 401 goto out; /* compatibility */ 402 403 /* 404 * Get and verify the address. 405 */ 406 407 if (msg->msg_namelen) { 408 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; 409 err = -EINVAL; 410 if (msg->msg_namelen < sizeof(*usin)) 411 goto out; 412 if (usin->sin_family != AF_INET) { 413 static int complained; 414 if (!complained++) 415 printk(KERN_INFO "%s forgot to set AF_INET in " 416 "raw sendmsg. Fix it!\n", 417 current->comm); 418 err = -EAFNOSUPPORT; 419 if (usin->sin_family) 420 goto out; 421 } 422 daddr = usin->sin_addr.s_addr; 423 /* ANK: I did not forget to get protocol from port field. 424 * I just do not know, who uses this weirdness. 425 * IP_HDRINCL is much more convenient. 426 */ 427 } else { 428 err = -EDESTADDRREQ; 429 if (sk->sk_state != TCP_ESTABLISHED) 430 goto out; 431 daddr = inet->daddr; 432 } 433 434 ipc.addr = inet->saddr; 435 ipc.opt = NULL; 436 ipc.oif = sk->sk_bound_dev_if; 437 438 if (msg->msg_controllen) { 439 err = ip_cmsg_send(msg, &ipc); 440 if (err) 441 goto out; 442 if (ipc.opt) 443 free = 1; 444 } 445 446 saddr = ipc.addr; 447 ipc.addr = daddr; 448 449 if (!ipc.opt) 450 ipc.opt = inet->opt; 451 452 if (ipc.opt) { 453 err = -EINVAL; 454 /* Linux does not mangle headers on raw sockets, 455 * so that IP options + IP_HDRINCL is non-sense. 456 */ 457 if (inet->hdrincl) 458 goto done; 459 if (ipc.opt->srr) { 460 if (!daddr) 461 goto done; 462 daddr = ipc.opt->faddr; 463 } 464 } 465 tos = RT_CONN_FLAGS(sk); 466 if (msg->msg_flags & MSG_DONTROUTE) 467 tos |= RTO_ONLINK; 468 469 if (MULTICAST(daddr)) { 470 if (!ipc.oif) 471 ipc.oif = inet->mc_index; 472 if (!saddr) 473 saddr = inet->mc_addr; 474 } 475 476 { 477 struct flowi fl = { .oif = ipc.oif, 478 .nl_u = { .ip4_u = 479 { .daddr = daddr, 480 .saddr = saddr, 481 .tos = tos } }, 482 .proto = inet->hdrincl ? IPPROTO_RAW : 483 sk->sk_protocol, 484 }; 485 if (!inet->hdrincl) { 486 err = raw_probe_proto_opt(&fl, msg); 487 if (err) 488 goto done; 489 } 490 491 security_sk_classify_flow(sk, &fl); 492 err = ip_route_output_flow(&rt, &fl, sk, 1); 493 } 494 if (err) 495 goto done; 496 497 err = -EACCES; 498 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 499 goto done; 500 501 if (msg->msg_flags & MSG_CONFIRM) 502 goto do_confirm; 503 back_from_confirm: 504 505 if (inet->hdrincl) 506 err = raw_send_hdrinc(sk, msg->msg_iov, len, 507 rt, msg->msg_flags); 508 509 else { 510 if (!ipc.addr) 511 ipc.addr = rt->rt_dst; 512 lock_sock(sk); 513 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 514 &ipc, rt, msg->msg_flags); 515 if (err) 516 ip_flush_pending_frames(sk); 517 else if (!(msg->msg_flags & MSG_MORE)) 518 err = ip_push_pending_frames(sk); 519 release_sock(sk); 520 } 521 done: 522 if (free) 523 kfree(ipc.opt); 524 ip_rt_put(rt); 525 526 out: 527 if (err < 0) 528 return err; 529 return len; 530 531 do_confirm: 532 dst_confirm(&rt->u.dst); 533 if (!(msg->msg_flags & MSG_PROBE) || len) 534 goto back_from_confirm; 535 err = 0; 536 goto done; 537 } 538 539 static void raw_close(struct sock *sk, long timeout) 540 { 541 /* 542 * Raw sockets may have direct kernel refereneces. Kill them. 543 */ 544 ip_ra_control(sk, 0, NULL); 545 546 sk_common_release(sk); 547 } 548 549 /* This gets rid of all the nasties in af_inet. -DaveM */ 550 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 551 { 552 struct inet_sock *inet = inet_sk(sk); 553 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 554 int ret = -EINVAL; 555 int chk_addr_ret; 556 557 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 558 goto out; 559 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 560 ret = -EADDRNOTAVAIL; 561 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 562 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 563 goto out; 564 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 565 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 566 inet->saddr = 0; /* Use device */ 567 sk_dst_reset(sk); 568 ret = 0; 569 out: return ret; 570 } 571 572 /* 573 * This should be easy, if there is something there 574 * we return it, otherwise we block. 575 */ 576 577 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 578 size_t len, int noblock, int flags, int *addr_len) 579 { 580 struct inet_sock *inet = inet_sk(sk); 581 size_t copied = 0; 582 int err = -EOPNOTSUPP; 583 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 584 struct sk_buff *skb; 585 586 if (flags & MSG_OOB) 587 goto out; 588 589 if (addr_len) 590 *addr_len = sizeof(*sin); 591 592 if (flags & MSG_ERRQUEUE) { 593 err = ip_recv_error(sk, msg, len); 594 goto out; 595 } 596 597 skb = skb_recv_datagram(sk, flags, noblock, &err); 598 if (!skb) 599 goto out; 600 601 copied = skb->len; 602 if (len < copied) { 603 msg->msg_flags |= MSG_TRUNC; 604 copied = len; 605 } 606 607 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 608 if (err) 609 goto done; 610 611 sock_recv_timestamp(msg, sk, skb); 612 613 /* Copy the address. */ 614 if (sin) { 615 sin->sin_family = AF_INET; 616 sin->sin_addr.s_addr = skb->nh.iph->saddr; 617 sin->sin_port = 0; 618 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 619 } 620 if (inet->cmsg_flags) 621 ip_cmsg_recv(msg, skb); 622 if (flags & MSG_TRUNC) 623 copied = skb->len; 624 done: 625 skb_free_datagram(sk, skb); 626 out: 627 if (err) 628 return err; 629 return copied; 630 } 631 632 static int raw_init(struct sock *sk) 633 { 634 struct raw_sock *rp = raw_sk(sk); 635 636 if (inet_sk(sk)->num == IPPROTO_ICMP) 637 memset(&rp->filter, 0, sizeof(rp->filter)); 638 return 0; 639 } 640 641 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 642 { 643 if (optlen > sizeof(struct icmp_filter)) 644 optlen = sizeof(struct icmp_filter); 645 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 646 return -EFAULT; 647 return 0; 648 } 649 650 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 651 { 652 int len, ret = -EFAULT; 653 654 if (get_user(len, optlen)) 655 goto out; 656 ret = -EINVAL; 657 if (len < 0) 658 goto out; 659 if (len > sizeof(struct icmp_filter)) 660 len = sizeof(struct icmp_filter); 661 ret = -EFAULT; 662 if (put_user(len, optlen) || 663 copy_to_user(optval, &raw_sk(sk)->filter, len)) 664 goto out; 665 ret = 0; 666 out: return ret; 667 } 668 669 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 670 char __user *optval, int optlen) 671 { 672 if (optname == ICMP_FILTER) { 673 if (inet_sk(sk)->num != IPPROTO_ICMP) 674 return -EOPNOTSUPP; 675 else 676 return raw_seticmpfilter(sk, optval, optlen); 677 } 678 return -ENOPROTOOPT; 679 } 680 681 static int raw_setsockopt(struct sock *sk, int level, int optname, 682 char __user *optval, int optlen) 683 { 684 if (level != SOL_RAW) 685 return ip_setsockopt(sk, level, optname, optval, optlen); 686 return do_raw_setsockopt(sk, level, optname, optval, optlen); 687 } 688 689 #ifdef CONFIG_COMPAT 690 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 691 char __user *optval, int optlen) 692 { 693 if (level != SOL_RAW) 694 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 695 return do_raw_setsockopt(sk, level, optname, optval, optlen); 696 } 697 #endif 698 699 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 700 char __user *optval, int __user *optlen) 701 { 702 if (optname == ICMP_FILTER) { 703 if (inet_sk(sk)->num != IPPROTO_ICMP) 704 return -EOPNOTSUPP; 705 else 706 return raw_geticmpfilter(sk, optval, optlen); 707 } 708 return -ENOPROTOOPT; 709 } 710 711 static int raw_getsockopt(struct sock *sk, int level, int optname, 712 char __user *optval, int __user *optlen) 713 { 714 if (level != SOL_RAW) 715 return ip_getsockopt(sk, level, optname, optval, optlen); 716 return do_raw_getsockopt(sk, level, optname, optval, optlen); 717 } 718 719 #ifdef CONFIG_COMPAT 720 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 721 char __user *optval, int __user *optlen) 722 { 723 if (level != SOL_RAW) 724 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 725 return do_raw_getsockopt(sk, level, optname, optval, optlen); 726 } 727 #endif 728 729 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 730 { 731 switch (cmd) { 732 case SIOCOUTQ: { 733 int amount = atomic_read(&sk->sk_wmem_alloc); 734 return put_user(amount, (int __user *)arg); 735 } 736 case SIOCINQ: { 737 struct sk_buff *skb; 738 int amount = 0; 739 740 spin_lock_bh(&sk->sk_receive_queue.lock); 741 skb = skb_peek(&sk->sk_receive_queue); 742 if (skb != NULL) 743 amount = skb->len; 744 spin_unlock_bh(&sk->sk_receive_queue.lock); 745 return put_user(amount, (int __user *)arg); 746 } 747 748 default: 749 #ifdef CONFIG_IP_MROUTE 750 return ipmr_ioctl(sk, cmd, (void __user *)arg); 751 #else 752 return -ENOIOCTLCMD; 753 #endif 754 } 755 } 756 757 struct proto raw_prot = { 758 .name = "RAW", 759 .owner = THIS_MODULE, 760 .close = raw_close, 761 .connect = ip4_datagram_connect, 762 .disconnect = udp_disconnect, 763 .ioctl = raw_ioctl, 764 .init = raw_init, 765 .setsockopt = raw_setsockopt, 766 .getsockopt = raw_getsockopt, 767 .sendmsg = raw_sendmsg, 768 .recvmsg = raw_recvmsg, 769 .bind = raw_bind, 770 .backlog_rcv = raw_rcv_skb, 771 .hash = raw_v4_hash, 772 .unhash = raw_v4_unhash, 773 .obj_size = sizeof(struct raw_sock), 774 #ifdef CONFIG_COMPAT 775 .compat_setsockopt = compat_raw_setsockopt, 776 .compat_getsockopt = compat_raw_getsockopt, 777 #endif 778 }; 779 780 #ifdef CONFIG_PROC_FS 781 struct raw_iter_state { 782 int bucket; 783 }; 784 785 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) 786 787 static struct sock *raw_get_first(struct seq_file *seq) 788 { 789 struct sock *sk; 790 struct raw_iter_state* state = raw_seq_private(seq); 791 792 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { 793 struct hlist_node *node; 794 795 sk_for_each(sk, node, &raw_v4_htable[state->bucket]) 796 if (sk->sk_family == PF_INET) 797 goto found; 798 } 799 sk = NULL; 800 found: 801 return sk; 802 } 803 804 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 805 { 806 struct raw_iter_state* state = raw_seq_private(seq); 807 808 do { 809 sk = sk_next(sk); 810 try_again: 811 ; 812 } while (sk && sk->sk_family != PF_INET); 813 814 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { 815 sk = sk_head(&raw_v4_htable[state->bucket]); 816 goto try_again; 817 } 818 return sk; 819 } 820 821 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 822 { 823 struct sock *sk = raw_get_first(seq); 824 825 if (sk) 826 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 827 --pos; 828 return pos ? NULL : sk; 829 } 830 831 static void *raw_seq_start(struct seq_file *seq, loff_t *pos) 832 { 833 read_lock(&raw_v4_lock); 834 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 835 } 836 837 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 838 { 839 struct sock *sk; 840 841 if (v == SEQ_START_TOKEN) 842 sk = raw_get_first(seq); 843 else 844 sk = raw_get_next(seq, v); 845 ++*pos; 846 return sk; 847 } 848 849 static void raw_seq_stop(struct seq_file *seq, void *v) 850 { 851 read_unlock(&raw_v4_lock); 852 } 853 854 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) 855 { 856 struct inet_sock *inet = inet_sk(sp); 857 __be32 dest = inet->daddr, 858 src = inet->rcv_saddr; 859 __u16 destp = 0, 860 srcp = inet->num; 861 862 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 863 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 864 i, src, srcp, dest, destp, sp->sk_state, 865 atomic_read(&sp->sk_wmem_alloc), 866 atomic_read(&sp->sk_rmem_alloc), 867 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 868 atomic_read(&sp->sk_refcnt), sp); 869 return tmpbuf; 870 } 871 872 static int raw_seq_show(struct seq_file *seq, void *v) 873 { 874 char tmpbuf[129]; 875 876 if (v == SEQ_START_TOKEN) 877 seq_printf(seq, "%-127s\n", 878 " sl local_address rem_address st tx_queue " 879 "rx_queue tr tm->when retrnsmt uid timeout " 880 "inode"); 881 else { 882 struct raw_iter_state *state = raw_seq_private(seq); 883 884 seq_printf(seq, "%-127s\n", 885 get_raw_sock(v, tmpbuf, state->bucket)); 886 } 887 return 0; 888 } 889 890 static struct seq_operations raw_seq_ops = { 891 .start = raw_seq_start, 892 .next = raw_seq_next, 893 .stop = raw_seq_stop, 894 .show = raw_seq_show, 895 }; 896 897 static int raw_seq_open(struct inode *inode, struct file *file) 898 { 899 struct seq_file *seq; 900 int rc = -ENOMEM; 901 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 902 903 if (!s) 904 goto out; 905 rc = seq_open(file, &raw_seq_ops); 906 if (rc) 907 goto out_kfree; 908 909 seq = file->private_data; 910 seq->private = s; 911 memset(s, 0, sizeof(*s)); 912 out: 913 return rc; 914 out_kfree: 915 kfree(s); 916 goto out; 917 } 918 919 static const struct file_operations raw_seq_fops = { 920 .owner = THIS_MODULE, 921 .open = raw_seq_open, 922 .read = seq_read, 923 .llseek = seq_lseek, 924 .release = seq_release_private, 925 }; 926 927 int __init raw_proc_init(void) 928 { 929 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) 930 return -ENOMEM; 931 return 0; 932 } 933 934 void __init raw_proc_exit(void) 935 { 936 proc_net_remove("raw"); 937 } 938 #endif /* CONFIG_PROC_FS */ 939