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 unsigned int iphlen; 275 int err; 276 277 if (length > rt->u.dst.dev->mtu) { 278 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, 279 rt->u.dst.dev->mtu); 280 return -EMSGSIZE; 281 } 282 if (flags&MSG_PROBE) 283 goto out; 284 285 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 286 287 skb = sock_alloc_send_skb(sk, length+hh_len+15, 288 flags&MSG_DONTWAIT, &err); 289 if (skb == NULL) 290 goto error; 291 skb_reserve(skb, hh_len); 292 293 skb->priority = sk->sk_priority; 294 skb->dst = dst_clone(&rt->u.dst); 295 296 skb_reset_network_header(skb); 297 iph = ip_hdr(skb); 298 skb_put(skb, length); 299 300 skb->ip_summed = CHECKSUM_NONE; 301 302 skb->transport_header = skb->network_header; 303 err = memcpy_fromiovecend((void *)iph, from, 0, length); 304 if (err) 305 goto error_fault; 306 307 /* We don't modify invalid header */ 308 iphlen = iph->ihl * 4; 309 if (iphlen >= sizeof(*iph) && iphlen <= length) { 310 if (!iph->saddr) 311 iph->saddr = rt->rt_src; 312 iph->check = 0; 313 iph->tot_len = htons(length); 314 if (!iph->id) 315 ip_select_ident(iph, &rt->u.dst, NULL); 316 317 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 318 } 319 if (iph->protocol == IPPROTO_ICMP) 320 icmp_out_count(((struct icmphdr *) 321 skb_transport_header(skb))->type); 322 323 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 324 dst_output); 325 if (err > 0) 326 err = inet->recverr ? net_xmit_errno(err) : 0; 327 if (err) 328 goto error; 329 out: 330 return 0; 331 332 error_fault: 333 err = -EFAULT; 334 kfree_skb(skb); 335 error: 336 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 337 return err; 338 } 339 340 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 341 { 342 struct iovec *iov; 343 u8 __user *type = NULL; 344 u8 __user *code = NULL; 345 int probed = 0; 346 unsigned int i; 347 348 if (!msg->msg_iov) 349 return 0; 350 351 for (i = 0; i < msg->msg_iovlen; i++) { 352 iov = &msg->msg_iov[i]; 353 if (!iov) 354 continue; 355 356 switch (fl->proto) { 357 case IPPROTO_ICMP: 358 /* check if one-byte field is readable or not. */ 359 if (iov->iov_base && iov->iov_len < 1) 360 break; 361 362 if (!type) { 363 type = iov->iov_base; 364 /* check if code field is readable or not. */ 365 if (iov->iov_len > 1) 366 code = type + 1; 367 } else if (!code) 368 code = iov->iov_base; 369 370 if (type && code) { 371 if (get_user(fl->fl_icmp_type, type) || 372 get_user(fl->fl_icmp_code, code)) 373 return -EFAULT; 374 probed = 1; 375 } 376 break; 377 default: 378 probed = 1; 379 break; 380 } 381 if (probed) 382 break; 383 } 384 return 0; 385 } 386 387 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 388 size_t len) 389 { 390 struct inet_sock *inet = inet_sk(sk); 391 struct ipcm_cookie ipc; 392 struct rtable *rt = NULL; 393 int free = 0; 394 __be32 daddr; 395 __be32 saddr; 396 u8 tos; 397 int err; 398 399 err = -EMSGSIZE; 400 if (len > 0xFFFF) 401 goto out; 402 403 /* 404 * Check the flags. 405 */ 406 407 err = -EOPNOTSUPP; 408 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 409 goto out; /* compatibility */ 410 411 /* 412 * Get and verify the address. 413 */ 414 415 if (msg->msg_namelen) { 416 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; 417 err = -EINVAL; 418 if (msg->msg_namelen < sizeof(*usin)) 419 goto out; 420 if (usin->sin_family != AF_INET) { 421 static int complained; 422 if (!complained++) 423 printk(KERN_INFO "%s forgot to set AF_INET in " 424 "raw sendmsg. Fix it!\n", 425 current->comm); 426 err = -EAFNOSUPPORT; 427 if (usin->sin_family) 428 goto out; 429 } 430 daddr = usin->sin_addr.s_addr; 431 /* ANK: I did not forget to get protocol from port field. 432 * I just do not know, who uses this weirdness. 433 * IP_HDRINCL is much more convenient. 434 */ 435 } else { 436 err = -EDESTADDRREQ; 437 if (sk->sk_state != TCP_ESTABLISHED) 438 goto out; 439 daddr = inet->daddr; 440 } 441 442 ipc.addr = inet->saddr; 443 ipc.opt = NULL; 444 ipc.oif = sk->sk_bound_dev_if; 445 446 if (msg->msg_controllen) { 447 err = ip_cmsg_send(msg, &ipc); 448 if (err) 449 goto out; 450 if (ipc.opt) 451 free = 1; 452 } 453 454 saddr = ipc.addr; 455 ipc.addr = daddr; 456 457 if (!ipc.opt) 458 ipc.opt = inet->opt; 459 460 if (ipc.opt) { 461 err = -EINVAL; 462 /* Linux does not mangle headers on raw sockets, 463 * so that IP options + IP_HDRINCL is non-sense. 464 */ 465 if (inet->hdrincl) 466 goto done; 467 if (ipc.opt->srr) { 468 if (!daddr) 469 goto done; 470 daddr = ipc.opt->faddr; 471 } 472 } 473 tos = RT_CONN_FLAGS(sk); 474 if (msg->msg_flags & MSG_DONTROUTE) 475 tos |= RTO_ONLINK; 476 477 if (MULTICAST(daddr)) { 478 if (!ipc.oif) 479 ipc.oif = inet->mc_index; 480 if (!saddr) 481 saddr = inet->mc_addr; 482 } 483 484 { 485 struct flowi fl = { .oif = ipc.oif, 486 .nl_u = { .ip4_u = 487 { .daddr = daddr, 488 .saddr = saddr, 489 .tos = tos } }, 490 .proto = inet->hdrincl ? IPPROTO_RAW : 491 sk->sk_protocol, 492 }; 493 if (!inet->hdrincl) { 494 err = raw_probe_proto_opt(&fl, msg); 495 if (err) 496 goto done; 497 } 498 499 security_sk_classify_flow(sk, &fl); 500 err = ip_route_output_flow(&rt, &fl, sk, 1); 501 } 502 if (err) 503 goto done; 504 505 err = -EACCES; 506 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 507 goto done; 508 509 if (msg->msg_flags & MSG_CONFIRM) 510 goto do_confirm; 511 back_from_confirm: 512 513 if (inet->hdrincl) 514 err = raw_send_hdrinc(sk, msg->msg_iov, len, 515 rt, msg->msg_flags); 516 517 else { 518 if (!ipc.addr) 519 ipc.addr = rt->rt_dst; 520 lock_sock(sk); 521 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 522 &ipc, rt, msg->msg_flags); 523 if (err) 524 ip_flush_pending_frames(sk); 525 else if (!(msg->msg_flags & MSG_MORE)) 526 err = ip_push_pending_frames(sk); 527 release_sock(sk); 528 } 529 done: 530 if (free) 531 kfree(ipc.opt); 532 ip_rt_put(rt); 533 534 out: 535 if (err < 0) 536 return err; 537 return len; 538 539 do_confirm: 540 dst_confirm(&rt->u.dst); 541 if (!(msg->msg_flags & MSG_PROBE) || len) 542 goto back_from_confirm; 543 err = 0; 544 goto done; 545 } 546 547 static void raw_close(struct sock *sk, long timeout) 548 { 549 /* 550 * Raw sockets may have direct kernel refereneces. Kill them. 551 */ 552 ip_ra_control(sk, 0, NULL); 553 554 sk_common_release(sk); 555 } 556 557 /* This gets rid of all the nasties in af_inet. -DaveM */ 558 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 559 { 560 struct inet_sock *inet = inet_sk(sk); 561 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 562 int ret = -EINVAL; 563 int chk_addr_ret; 564 565 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 566 goto out; 567 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 568 ret = -EADDRNOTAVAIL; 569 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 570 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 571 goto out; 572 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 573 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 574 inet->saddr = 0; /* Use device */ 575 sk_dst_reset(sk); 576 ret = 0; 577 out: return ret; 578 } 579 580 /* 581 * This should be easy, if there is something there 582 * we return it, otherwise we block. 583 */ 584 585 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 586 size_t len, int noblock, int flags, int *addr_len) 587 { 588 struct inet_sock *inet = inet_sk(sk); 589 size_t copied = 0; 590 int err = -EOPNOTSUPP; 591 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 592 struct sk_buff *skb; 593 594 if (flags & MSG_OOB) 595 goto out; 596 597 if (addr_len) 598 *addr_len = sizeof(*sin); 599 600 if (flags & MSG_ERRQUEUE) { 601 err = ip_recv_error(sk, msg, len); 602 goto out; 603 } 604 605 skb = skb_recv_datagram(sk, flags, noblock, &err); 606 if (!skb) 607 goto out; 608 609 copied = skb->len; 610 if (len < copied) { 611 msg->msg_flags |= MSG_TRUNC; 612 copied = len; 613 } 614 615 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 616 if (err) 617 goto done; 618 619 sock_recv_timestamp(msg, sk, skb); 620 621 /* Copy the address. */ 622 if (sin) { 623 sin->sin_family = AF_INET; 624 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 625 sin->sin_port = 0; 626 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 627 } 628 if (inet->cmsg_flags) 629 ip_cmsg_recv(msg, skb); 630 if (flags & MSG_TRUNC) 631 copied = skb->len; 632 done: 633 skb_free_datagram(sk, skb); 634 out: 635 if (err) 636 return err; 637 return copied; 638 } 639 640 static int raw_init(struct sock *sk) 641 { 642 struct raw_sock *rp = raw_sk(sk); 643 644 if (inet_sk(sk)->num == IPPROTO_ICMP) 645 memset(&rp->filter, 0, sizeof(rp->filter)); 646 return 0; 647 } 648 649 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 650 { 651 if (optlen > sizeof(struct icmp_filter)) 652 optlen = sizeof(struct icmp_filter); 653 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 654 return -EFAULT; 655 return 0; 656 } 657 658 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 659 { 660 int len, ret = -EFAULT; 661 662 if (get_user(len, optlen)) 663 goto out; 664 ret = -EINVAL; 665 if (len < 0) 666 goto out; 667 if (len > sizeof(struct icmp_filter)) 668 len = sizeof(struct icmp_filter); 669 ret = -EFAULT; 670 if (put_user(len, optlen) || 671 copy_to_user(optval, &raw_sk(sk)->filter, len)) 672 goto out; 673 ret = 0; 674 out: return ret; 675 } 676 677 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 678 char __user *optval, int optlen) 679 { 680 if (optname == ICMP_FILTER) { 681 if (inet_sk(sk)->num != IPPROTO_ICMP) 682 return -EOPNOTSUPP; 683 else 684 return raw_seticmpfilter(sk, optval, optlen); 685 } 686 return -ENOPROTOOPT; 687 } 688 689 static int raw_setsockopt(struct sock *sk, int level, int optname, 690 char __user *optval, int optlen) 691 { 692 if (level != SOL_RAW) 693 return ip_setsockopt(sk, level, optname, optval, optlen); 694 return do_raw_setsockopt(sk, level, optname, optval, optlen); 695 } 696 697 #ifdef CONFIG_COMPAT 698 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 699 char __user *optval, int optlen) 700 { 701 if (level != SOL_RAW) 702 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 703 return do_raw_setsockopt(sk, level, optname, optval, optlen); 704 } 705 #endif 706 707 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 708 char __user *optval, int __user *optlen) 709 { 710 if (optname == ICMP_FILTER) { 711 if (inet_sk(sk)->num != IPPROTO_ICMP) 712 return -EOPNOTSUPP; 713 else 714 return raw_geticmpfilter(sk, optval, optlen); 715 } 716 return -ENOPROTOOPT; 717 } 718 719 static int raw_getsockopt(struct sock *sk, int level, int optname, 720 char __user *optval, int __user *optlen) 721 { 722 if (level != SOL_RAW) 723 return ip_getsockopt(sk, level, optname, optval, optlen); 724 return do_raw_getsockopt(sk, level, optname, optval, optlen); 725 } 726 727 #ifdef CONFIG_COMPAT 728 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 729 char __user *optval, int __user *optlen) 730 { 731 if (level != SOL_RAW) 732 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 733 return do_raw_getsockopt(sk, level, optname, optval, optlen); 734 } 735 #endif 736 737 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 738 { 739 switch (cmd) { 740 case SIOCOUTQ: { 741 int amount = atomic_read(&sk->sk_wmem_alloc); 742 return put_user(amount, (int __user *)arg); 743 } 744 case SIOCINQ: { 745 struct sk_buff *skb; 746 int amount = 0; 747 748 spin_lock_bh(&sk->sk_receive_queue.lock); 749 skb = skb_peek(&sk->sk_receive_queue); 750 if (skb != NULL) 751 amount = skb->len; 752 spin_unlock_bh(&sk->sk_receive_queue.lock); 753 return put_user(amount, (int __user *)arg); 754 } 755 756 default: 757 #ifdef CONFIG_IP_MROUTE 758 return ipmr_ioctl(sk, cmd, (void __user *)arg); 759 #else 760 return -ENOIOCTLCMD; 761 #endif 762 } 763 } 764 765 DEFINE_PROTO_INUSE(raw) 766 767 struct proto raw_prot = { 768 .name = "RAW", 769 .owner = THIS_MODULE, 770 .close = raw_close, 771 .connect = ip4_datagram_connect, 772 .disconnect = udp_disconnect, 773 .ioctl = raw_ioctl, 774 .init = raw_init, 775 .setsockopt = raw_setsockopt, 776 .getsockopt = raw_getsockopt, 777 .sendmsg = raw_sendmsg, 778 .recvmsg = raw_recvmsg, 779 .bind = raw_bind, 780 .backlog_rcv = raw_rcv_skb, 781 .hash = raw_v4_hash, 782 .unhash = raw_v4_unhash, 783 .obj_size = sizeof(struct raw_sock), 784 #ifdef CONFIG_COMPAT 785 .compat_setsockopt = compat_raw_setsockopt, 786 .compat_getsockopt = compat_raw_getsockopt, 787 #endif 788 REF_PROTO_INUSE(raw) 789 }; 790 791 #ifdef CONFIG_PROC_FS 792 struct raw_iter_state { 793 int bucket; 794 }; 795 796 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) 797 798 static struct sock *raw_get_first(struct seq_file *seq) 799 { 800 struct sock *sk; 801 struct raw_iter_state* state = raw_seq_private(seq); 802 803 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { 804 struct hlist_node *node; 805 806 sk_for_each(sk, node, &raw_v4_htable[state->bucket]) 807 if (sk->sk_family == PF_INET) 808 goto found; 809 } 810 sk = NULL; 811 found: 812 return sk; 813 } 814 815 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 816 { 817 struct raw_iter_state* state = raw_seq_private(seq); 818 819 do { 820 sk = sk_next(sk); 821 try_again: 822 ; 823 } while (sk && sk->sk_family != PF_INET); 824 825 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { 826 sk = sk_head(&raw_v4_htable[state->bucket]); 827 goto try_again; 828 } 829 return sk; 830 } 831 832 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 833 { 834 struct sock *sk = raw_get_first(seq); 835 836 if (sk) 837 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 838 --pos; 839 return pos ? NULL : sk; 840 } 841 842 static void *raw_seq_start(struct seq_file *seq, loff_t *pos) 843 { 844 read_lock(&raw_v4_lock); 845 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 846 } 847 848 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 849 { 850 struct sock *sk; 851 852 if (v == SEQ_START_TOKEN) 853 sk = raw_get_first(seq); 854 else 855 sk = raw_get_next(seq, v); 856 ++*pos; 857 return sk; 858 } 859 860 static void raw_seq_stop(struct seq_file *seq, void *v) 861 { 862 read_unlock(&raw_v4_lock); 863 } 864 865 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) 866 { 867 struct inet_sock *inet = inet_sk(sp); 868 __be32 dest = inet->daddr, 869 src = inet->rcv_saddr; 870 __u16 destp = 0, 871 srcp = inet->num; 872 873 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 874 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 875 i, src, srcp, dest, destp, sp->sk_state, 876 atomic_read(&sp->sk_wmem_alloc), 877 atomic_read(&sp->sk_rmem_alloc), 878 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 879 atomic_read(&sp->sk_refcnt), sp); 880 return tmpbuf; 881 } 882 883 static int raw_seq_show(struct seq_file *seq, void *v) 884 { 885 char tmpbuf[129]; 886 887 if (v == SEQ_START_TOKEN) 888 seq_printf(seq, "%-127s\n", 889 " sl local_address rem_address st tx_queue " 890 "rx_queue tr tm->when retrnsmt uid timeout " 891 "inode"); 892 else { 893 struct raw_iter_state *state = raw_seq_private(seq); 894 895 seq_printf(seq, "%-127s\n", 896 get_raw_sock(v, tmpbuf, state->bucket)); 897 } 898 return 0; 899 } 900 901 static const struct seq_operations raw_seq_ops = { 902 .start = raw_seq_start, 903 .next = raw_seq_next, 904 .stop = raw_seq_stop, 905 .show = raw_seq_show, 906 }; 907 908 static int raw_seq_open(struct inode *inode, struct file *file) 909 { 910 return seq_open_private(file, &raw_seq_ops, 911 sizeof(struct raw_iter_state)); 912 } 913 914 static const struct file_operations raw_seq_fops = { 915 .owner = THIS_MODULE, 916 .open = raw_seq_open, 917 .read = seq_read, 918 .llseek = seq_lseek, 919 .release = seq_release_private, 920 }; 921 922 int __init raw_proc_init(void) 923 { 924 if (!proc_net_fops_create(&init_net, "raw", S_IRUGO, &raw_seq_fops)) 925 return -ENOMEM; 926 return 0; 927 } 928 929 void __init raw_proc_exit(void) 930 { 931 proc_net_remove(&init_net, "raw"); 932 } 933 #endif /* CONFIG_PROC_FS */ 934