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, <bir7@leland.Stanford.Edu> 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/config.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/types.h> 49 #include <linux/stddef.h> 50 #include <linux/slab.h> 51 #include <linux/errno.h> 52 #include <linux/aio.h> 53 #include <linux/kernel.h> 54 #include <linux/spinlock.h> 55 #include <linux/sockios.h> 56 #include <linux/socket.h> 57 #include <linux/in.h> 58 #include <linux/mroute.h> 59 #include <linux/netdevice.h> 60 #include <linux/in_route.h> 61 #include <linux/route.h> 62 #include <linux/tcp.h> 63 #include <linux/skbuff.h> 64 #include <net/dst.h> 65 #include <net/sock.h> 66 #include <linux/gfp.h> 67 #include <linux/ip.h> 68 #include <linux/net.h> 69 #include <net/ip.h> 70 #include <net/icmp.h> 71 #include <net/udp.h> 72 #include <net/raw.h> 73 #include <net/snmp.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 unsigned long raddr, unsigned long 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 = skb->h.icmph->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 void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) 154 { 155 struct sock *sk; 156 struct hlist_head *head; 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 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { 168 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 169 170 /* Not releasing hash table! */ 171 if (clone) 172 raw_rcv(sk, clone); 173 } 174 sk = __raw_v4_lookup(sk_next(sk), iph->protocol, 175 iph->saddr, iph->daddr, 176 skb->dev->ifindex); 177 } 178 out: 179 read_unlock(&raw_v4_lock); 180 } 181 182 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info) 183 { 184 struct inet_sock *inet = inet_sk(sk); 185 int type = skb->h.icmph->type; 186 int code = skb->h.icmph->code; 187 int err = 0; 188 int harderr = 0; 189 190 /* Report error on raw socket, if: 191 1. User requested ip_recverr. 192 2. Socket is connected (otherwise the error indication 193 is useless without ip_recverr and error is hard. 194 */ 195 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 196 return; 197 198 switch (type) { 199 default: 200 case ICMP_TIME_EXCEEDED: 201 err = EHOSTUNREACH; 202 break; 203 case ICMP_SOURCE_QUENCH: 204 return; 205 case ICMP_PARAMETERPROB: 206 err = EPROTO; 207 harderr = 1; 208 break; 209 case ICMP_DEST_UNREACH: 210 err = EHOSTUNREACH; 211 if (code > NR_ICMP_UNREACH) 212 break; 213 err = icmp_err_convert[code].errno; 214 harderr = icmp_err_convert[code].fatal; 215 if (code == ICMP_FRAG_NEEDED) { 216 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 217 err = EMSGSIZE; 218 } 219 } 220 221 if (inet->recverr) { 222 struct iphdr *iph = (struct iphdr*)skb->data; 223 u8 *payload = skb->data + (iph->ihl << 2); 224 225 if (inet->hdrincl) 226 payload = skb->data; 227 ip_icmp_error(sk, skb, err, 0, info, payload); 228 } 229 230 if (inet->recverr || harderr) { 231 sk->sk_err = err; 232 sk->sk_error_report(sk); 233 } 234 } 235 236 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) 237 { 238 /* Charge it to the socket. */ 239 240 if (sock_queue_rcv_skb(sk, skb) < 0) { 241 /* FIXME: increment a raw drops counter here */ 242 kfree_skb(skb); 243 return NET_RX_DROP; 244 } 245 246 return NET_RX_SUCCESS; 247 } 248 249 int raw_rcv(struct sock *sk, struct sk_buff *skb) 250 { 251 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 252 kfree_skb(skb); 253 return NET_RX_DROP; 254 } 255 256 skb_push(skb, skb->data - skb->nh.raw); 257 258 raw_rcv_skb(sk, skb); 259 return 0; 260 } 261 262 static int raw_send_hdrinc(struct sock *sk, void *from, int length, 263 struct rtable *rt, 264 unsigned int flags) 265 { 266 struct inet_sock *inet = inet_sk(sk); 267 int hh_len; 268 struct iphdr *iph; 269 struct sk_buff *skb; 270 int err; 271 272 if (length > rt->u.dst.dev->mtu) { 273 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport, 274 rt->u.dst.dev->mtu); 275 return -EMSGSIZE; 276 } 277 if (flags&MSG_PROBE) 278 goto out; 279 280 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 281 282 skb = sock_alloc_send_skb(sk, length+hh_len+15, 283 flags&MSG_DONTWAIT, &err); 284 if (skb == NULL) 285 goto error; 286 skb_reserve(skb, hh_len); 287 288 skb->priority = sk->sk_priority; 289 skb->dst = dst_clone(&rt->u.dst); 290 291 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, length); 292 293 skb->ip_summed = CHECKSUM_NONE; 294 295 skb->h.raw = skb->nh.raw; 296 err = memcpy_fromiovecend((void *)iph, from, 0, length); 297 if (err) 298 goto error_fault; 299 300 /* We don't modify invalid header */ 301 if (length >= sizeof(*iph) && iph->ihl * 4 <= length) { 302 if (!iph->saddr) 303 iph->saddr = rt->rt_src; 304 iph->check = 0; 305 iph->tot_len = htons(length); 306 if (!iph->id) 307 ip_select_ident(iph, &rt->u.dst, NULL); 308 309 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 310 } 311 312 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 313 dst_output); 314 if (err > 0) 315 err = inet->recverr ? net_xmit_errno(err) : 0; 316 if (err) 317 goto error; 318 out: 319 return 0; 320 321 error_fault: 322 err = -EFAULT; 323 kfree_skb(skb); 324 error: 325 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 326 return err; 327 } 328 329 static void raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 330 { 331 struct iovec *iov; 332 u8 __user *type = NULL; 333 u8 __user *code = NULL; 334 int probed = 0; 335 int i; 336 337 if (!msg->msg_iov) 338 return; 339 340 for (i = 0; i < msg->msg_iovlen; i++) { 341 iov = &msg->msg_iov[i]; 342 if (!iov) 343 continue; 344 345 switch (fl->proto) { 346 case IPPROTO_ICMP: 347 /* check if one-byte field is readable or not. */ 348 if (iov->iov_base && iov->iov_len < 1) 349 break; 350 351 if (!type) { 352 type = iov->iov_base; 353 /* check if code field is readable or not. */ 354 if (iov->iov_len > 1) 355 code = type + 1; 356 } else if (!code) 357 code = iov->iov_base; 358 359 if (type && code) { 360 get_user(fl->fl_icmp_type, type); 361 __get_user(fl->fl_icmp_code, code); 362 probed = 1; 363 } 364 break; 365 default: 366 probed = 1; 367 break; 368 } 369 if (probed) 370 break; 371 } 372 } 373 374 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 375 size_t len) 376 { 377 struct inet_sock *inet = inet_sk(sk); 378 struct ipcm_cookie ipc; 379 struct rtable *rt = NULL; 380 int free = 0; 381 u32 daddr; 382 u32 saddr; 383 u8 tos; 384 int err; 385 386 err = -EMSGSIZE; 387 if (len < 0 || len > 0xFFFF) 388 goto out; 389 390 /* 391 * Check the flags. 392 */ 393 394 err = -EOPNOTSUPP; 395 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 396 goto out; /* compatibility */ 397 398 /* 399 * Get and verify the address. 400 */ 401 402 if (msg->msg_namelen) { 403 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; 404 err = -EINVAL; 405 if (msg->msg_namelen < sizeof(*usin)) 406 goto out; 407 if (usin->sin_family != AF_INET) { 408 static int complained; 409 if (!complained++) 410 printk(KERN_INFO "%s forgot to set AF_INET in " 411 "raw sendmsg. Fix it!\n", 412 current->comm); 413 err = -EAFNOSUPPORT; 414 if (usin->sin_family) 415 goto out; 416 } 417 daddr = usin->sin_addr.s_addr; 418 /* ANK: I did not forget to get protocol from port field. 419 * I just do not know, who uses this weirdness. 420 * IP_HDRINCL is much more convenient. 421 */ 422 } else { 423 err = -EDESTADDRREQ; 424 if (sk->sk_state != TCP_ESTABLISHED) 425 goto out; 426 daddr = inet->daddr; 427 } 428 429 ipc.addr = inet->saddr; 430 ipc.opt = NULL; 431 ipc.oif = sk->sk_bound_dev_if; 432 433 if (msg->msg_controllen) { 434 err = ip_cmsg_send(msg, &ipc); 435 if (err) 436 goto out; 437 if (ipc.opt) 438 free = 1; 439 } 440 441 saddr = ipc.addr; 442 ipc.addr = daddr; 443 444 if (!ipc.opt) 445 ipc.opt = inet->opt; 446 447 if (ipc.opt) { 448 err = -EINVAL; 449 /* Linux does not mangle headers on raw sockets, 450 * so that IP options + IP_HDRINCL is non-sense. 451 */ 452 if (inet->hdrincl) 453 goto done; 454 if (ipc.opt->srr) { 455 if (!daddr) 456 goto done; 457 daddr = ipc.opt->faddr; 458 } 459 } 460 tos = RT_CONN_FLAGS(sk); 461 if (msg->msg_flags & MSG_DONTROUTE) 462 tos |= RTO_ONLINK; 463 464 if (MULTICAST(daddr)) { 465 if (!ipc.oif) 466 ipc.oif = inet->mc_index; 467 if (!saddr) 468 saddr = inet->mc_addr; 469 } 470 471 { 472 struct flowi fl = { .oif = ipc.oif, 473 .nl_u = { .ip4_u = 474 { .daddr = daddr, 475 .saddr = saddr, 476 .tos = tos } }, 477 .proto = inet->hdrincl ? IPPROTO_RAW : 478 sk->sk_protocol, 479 }; 480 if (!inet->hdrincl) 481 raw_probe_proto_opt(&fl, msg); 482 483 err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT)); 484 } 485 if (err) 486 goto done; 487 488 err = -EACCES; 489 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 490 goto done; 491 492 if (msg->msg_flags & MSG_CONFIRM) 493 goto do_confirm; 494 back_from_confirm: 495 496 if (inet->hdrincl) 497 err = raw_send_hdrinc(sk, msg->msg_iov, len, 498 rt, msg->msg_flags); 499 500 else { 501 if (!ipc.addr) 502 ipc.addr = rt->rt_dst; 503 lock_sock(sk); 504 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 505 &ipc, rt, msg->msg_flags); 506 if (err) 507 ip_flush_pending_frames(sk); 508 else if (!(msg->msg_flags & MSG_MORE)) 509 err = ip_push_pending_frames(sk); 510 release_sock(sk); 511 } 512 done: 513 if (free) 514 kfree(ipc.opt); 515 ip_rt_put(rt); 516 517 out: return err < 0 ? err : len; 518 519 do_confirm: 520 dst_confirm(&rt->u.dst); 521 if (!(msg->msg_flags & MSG_PROBE) || len) 522 goto back_from_confirm; 523 err = 0; 524 goto done; 525 } 526 527 static void raw_close(struct sock *sk, long timeout) 528 { 529 /* 530 * Raw sockets may have direct kernel refereneces. Kill them. 531 */ 532 ip_ra_control(sk, 0, NULL); 533 534 sk_common_release(sk); 535 } 536 537 /* This gets rid of all the nasties in af_inet. -DaveM */ 538 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 539 { 540 struct inet_sock *inet = inet_sk(sk); 541 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 542 int ret = -EINVAL; 543 int chk_addr_ret; 544 545 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 546 goto out; 547 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 548 ret = -EADDRNOTAVAIL; 549 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 550 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 551 goto out; 552 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 553 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 554 inet->saddr = 0; /* Use device */ 555 sk_dst_reset(sk); 556 ret = 0; 557 out: return ret; 558 } 559 560 /* 561 * This should be easy, if there is something there 562 * we return it, otherwise we block. 563 */ 564 565 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 566 size_t len, int noblock, int flags, int *addr_len) 567 { 568 struct inet_sock *inet = inet_sk(sk); 569 size_t copied = 0; 570 int err = -EOPNOTSUPP; 571 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 572 struct sk_buff *skb; 573 574 if (flags & MSG_OOB) 575 goto out; 576 577 if (addr_len) 578 *addr_len = sizeof(*sin); 579 580 if (flags & MSG_ERRQUEUE) { 581 err = ip_recv_error(sk, msg, len); 582 goto out; 583 } 584 585 skb = skb_recv_datagram(sk, flags, noblock, &err); 586 if (!skb) 587 goto out; 588 589 copied = skb->len; 590 if (len < copied) { 591 msg->msg_flags |= MSG_TRUNC; 592 copied = len; 593 } 594 595 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 596 if (err) 597 goto done; 598 599 sock_recv_timestamp(msg, sk, skb); 600 601 /* Copy the address. */ 602 if (sin) { 603 sin->sin_family = AF_INET; 604 sin->sin_addr.s_addr = skb->nh.iph->saddr; 605 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 606 } 607 if (inet->cmsg_flags) 608 ip_cmsg_recv(msg, skb); 609 if (flags & MSG_TRUNC) 610 copied = skb->len; 611 done: 612 skb_free_datagram(sk, skb); 613 out: return err ? err : copied; 614 } 615 616 static int raw_init(struct sock *sk) 617 { 618 struct raw_sock *rp = raw_sk(sk); 619 620 if (inet_sk(sk)->num == IPPROTO_ICMP) 621 memset(&rp->filter, 0, sizeof(rp->filter)); 622 return 0; 623 } 624 625 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 626 { 627 if (optlen > sizeof(struct icmp_filter)) 628 optlen = sizeof(struct icmp_filter); 629 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 630 return -EFAULT; 631 return 0; 632 } 633 634 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 635 { 636 int len, ret = -EFAULT; 637 638 if (get_user(len, optlen)) 639 goto out; 640 ret = -EINVAL; 641 if (len < 0) 642 goto out; 643 if (len > sizeof(struct icmp_filter)) 644 len = sizeof(struct icmp_filter); 645 ret = -EFAULT; 646 if (put_user(len, optlen) || 647 copy_to_user(optval, &raw_sk(sk)->filter, len)) 648 goto out; 649 ret = 0; 650 out: return ret; 651 } 652 653 static int raw_setsockopt(struct sock *sk, int level, int optname, 654 char __user *optval, int optlen) 655 { 656 if (level != SOL_RAW) 657 return ip_setsockopt(sk, level, optname, optval, optlen); 658 659 if (optname == ICMP_FILTER) { 660 if (inet_sk(sk)->num != IPPROTO_ICMP) 661 return -EOPNOTSUPP; 662 else 663 return raw_seticmpfilter(sk, optval, optlen); 664 } 665 return -ENOPROTOOPT; 666 } 667 668 static int raw_getsockopt(struct sock *sk, int level, int optname, 669 char __user *optval, int __user *optlen) 670 { 671 if (level != SOL_RAW) 672 return ip_getsockopt(sk, level, optname, optval, optlen); 673 674 if (optname == ICMP_FILTER) { 675 if (inet_sk(sk)->num != IPPROTO_ICMP) 676 return -EOPNOTSUPP; 677 else 678 return raw_geticmpfilter(sk, optval, optlen); 679 } 680 return -ENOPROTOOPT; 681 } 682 683 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 684 { 685 switch (cmd) { 686 case SIOCOUTQ: { 687 int amount = atomic_read(&sk->sk_wmem_alloc); 688 return put_user(amount, (int __user *)arg); 689 } 690 case SIOCINQ: { 691 struct sk_buff *skb; 692 int amount = 0; 693 694 spin_lock_irq(&sk->sk_receive_queue.lock); 695 skb = skb_peek(&sk->sk_receive_queue); 696 if (skb != NULL) 697 amount = skb->len; 698 spin_unlock_irq(&sk->sk_receive_queue.lock); 699 return put_user(amount, (int __user *)arg); 700 } 701 702 default: 703 #ifdef CONFIG_IP_MROUTE 704 return ipmr_ioctl(sk, cmd, (void __user *)arg); 705 #else 706 return -ENOIOCTLCMD; 707 #endif 708 } 709 } 710 711 struct proto raw_prot = { 712 .name = "RAW", 713 .owner = THIS_MODULE, 714 .close = raw_close, 715 .connect = ip4_datagram_connect, 716 .disconnect = udp_disconnect, 717 .ioctl = raw_ioctl, 718 .init = raw_init, 719 .setsockopt = raw_setsockopt, 720 .getsockopt = raw_getsockopt, 721 .sendmsg = raw_sendmsg, 722 .recvmsg = raw_recvmsg, 723 .bind = raw_bind, 724 .backlog_rcv = raw_rcv_skb, 725 .hash = raw_v4_hash, 726 .unhash = raw_v4_unhash, 727 .obj_size = sizeof(struct raw_sock), 728 }; 729 730 #ifdef CONFIG_PROC_FS 731 struct raw_iter_state { 732 int bucket; 733 }; 734 735 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) 736 737 static struct sock *raw_get_first(struct seq_file *seq) 738 { 739 struct sock *sk; 740 struct raw_iter_state* state = raw_seq_private(seq); 741 742 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { 743 struct hlist_node *node; 744 745 sk_for_each(sk, node, &raw_v4_htable[state->bucket]) 746 if (sk->sk_family == PF_INET) 747 goto found; 748 } 749 sk = NULL; 750 found: 751 return sk; 752 } 753 754 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 755 { 756 struct raw_iter_state* state = raw_seq_private(seq); 757 758 do { 759 sk = sk_next(sk); 760 try_again: 761 ; 762 } while (sk && sk->sk_family != PF_INET); 763 764 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { 765 sk = sk_head(&raw_v4_htable[state->bucket]); 766 goto try_again; 767 } 768 return sk; 769 } 770 771 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 772 { 773 struct sock *sk = raw_get_first(seq); 774 775 if (sk) 776 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 777 --pos; 778 return pos ? NULL : sk; 779 } 780 781 static void *raw_seq_start(struct seq_file *seq, loff_t *pos) 782 { 783 read_lock(&raw_v4_lock); 784 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 785 } 786 787 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 788 { 789 struct sock *sk; 790 791 if (v == SEQ_START_TOKEN) 792 sk = raw_get_first(seq); 793 else 794 sk = raw_get_next(seq, v); 795 ++*pos; 796 return sk; 797 } 798 799 static void raw_seq_stop(struct seq_file *seq, void *v) 800 { 801 read_unlock(&raw_v4_lock); 802 } 803 804 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) 805 { 806 struct inet_sock *inet = inet_sk(sp); 807 unsigned int dest = inet->daddr, 808 src = inet->rcv_saddr; 809 __u16 destp = 0, 810 srcp = inet->num; 811 812 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 813 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 814 i, src, srcp, dest, destp, sp->sk_state, 815 atomic_read(&sp->sk_wmem_alloc), 816 atomic_read(&sp->sk_rmem_alloc), 817 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 818 atomic_read(&sp->sk_refcnt), sp); 819 return tmpbuf; 820 } 821 822 static int raw_seq_show(struct seq_file *seq, void *v) 823 { 824 char tmpbuf[129]; 825 826 if (v == SEQ_START_TOKEN) 827 seq_printf(seq, "%-127s\n", 828 " sl local_address rem_address st tx_queue " 829 "rx_queue tr tm->when retrnsmt uid timeout " 830 "inode"); 831 else { 832 struct raw_iter_state *state = raw_seq_private(seq); 833 834 seq_printf(seq, "%-127s\n", 835 get_raw_sock(v, tmpbuf, state->bucket)); 836 } 837 return 0; 838 } 839 840 static struct seq_operations raw_seq_ops = { 841 .start = raw_seq_start, 842 .next = raw_seq_next, 843 .stop = raw_seq_stop, 844 .show = raw_seq_show, 845 }; 846 847 static int raw_seq_open(struct inode *inode, struct file *file) 848 { 849 struct seq_file *seq; 850 int rc = -ENOMEM; 851 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 852 853 if (!s) 854 goto out; 855 rc = seq_open(file, &raw_seq_ops); 856 if (rc) 857 goto out_kfree; 858 859 seq = file->private_data; 860 seq->private = s; 861 memset(s, 0, sizeof(*s)); 862 out: 863 return rc; 864 out_kfree: 865 kfree(s); 866 goto out; 867 } 868 869 static struct file_operations raw_seq_fops = { 870 .owner = THIS_MODULE, 871 .open = raw_seq_open, 872 .read = seq_read, 873 .llseek = seq_lseek, 874 .release = seq_release_private, 875 }; 876 877 int __init raw_proc_init(void) 878 { 879 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) 880 return -ENOMEM; 881 return 0; 882 } 883 884 void __init raw_proc_exit(void) 885 { 886 proc_net_remove("raw"); 887 } 888 #endif /* CONFIG_PROC_FS */ 889