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