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/config.h> 43 #include <linux/types.h> 44 #include <asm/atomic.h> 45 #include <asm/byteorder.h> 46 #include <asm/current.h> 47 #include <asm/uaccess.h> 48 #include <asm/ioctls.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/skbuff.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 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 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 int type = skb->h.icmph->type; 189 int code = skb->h.icmph->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->nh.raw); 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->nh.iph = iph = (struct iphdr *)skb_put(skb, length); 296 297 skb->ip_summed = CHECKSUM_NONE; 298 299 skb->h.raw = skb->nh.raw; 300 err = memcpy_fromiovecend((void *)iph, from, 0, length); 301 if (err) 302 goto error_fault; 303 304 /* We don't modify invalid header */ 305 if (length >= sizeof(*iph) && iph->ihl * 4U <= length) { 306 if (!iph->saddr) 307 iph->saddr = rt->rt_src; 308 iph->check = 0; 309 iph->tot_len = htons(length); 310 if (!iph->id) 311 ip_select_ident(iph, &rt->u.dst, NULL); 312 313 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 314 } 315 316 err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 317 dst_output); 318 if (err > 0) 319 err = inet->recverr ? net_xmit_errno(err) : 0; 320 if (err) 321 goto error; 322 out: 323 return 0; 324 325 error_fault: 326 err = -EFAULT; 327 kfree_skb(skb); 328 error: 329 IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS); 330 return err; 331 } 332 333 static void raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 334 { 335 struct iovec *iov; 336 u8 __user *type = NULL; 337 u8 __user *code = NULL; 338 int probed = 0; 339 unsigned int i; 340 341 if (!msg->msg_iov) 342 return; 343 344 for (i = 0; i < msg->msg_iovlen; i++) { 345 iov = &msg->msg_iov[i]; 346 if (!iov) 347 continue; 348 349 switch (fl->proto) { 350 case IPPROTO_ICMP: 351 /* check if one-byte field is readable or not. */ 352 if (iov->iov_base && iov->iov_len < 1) 353 break; 354 355 if (!type) { 356 type = iov->iov_base; 357 /* check if code field is readable or not. */ 358 if (iov->iov_len > 1) 359 code = type + 1; 360 } else if (!code) 361 code = iov->iov_base; 362 363 if (type && code) { 364 get_user(fl->fl_icmp_type, type); 365 get_user(fl->fl_icmp_code, code); 366 probed = 1; 367 } 368 break; 369 default: 370 probed = 1; 371 break; 372 } 373 if (probed) 374 break; 375 } 376 } 377 378 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 379 size_t len) 380 { 381 struct inet_sock *inet = inet_sk(sk); 382 struct ipcm_cookie ipc; 383 struct rtable *rt = NULL; 384 int free = 0; 385 u32 daddr; 386 u32 saddr; 387 u8 tos; 388 int err; 389 390 err = -EMSGSIZE; 391 if (len > 0xFFFF) 392 goto out; 393 394 /* 395 * Check the flags. 396 */ 397 398 err = -EOPNOTSUPP; 399 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 400 goto out; /* compatibility */ 401 402 /* 403 * Get and verify the address. 404 */ 405 406 if (msg->msg_namelen) { 407 struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name; 408 err = -EINVAL; 409 if (msg->msg_namelen < sizeof(*usin)) 410 goto out; 411 if (usin->sin_family != AF_INET) { 412 static int complained; 413 if (!complained++) 414 printk(KERN_INFO "%s forgot to set AF_INET in " 415 "raw sendmsg. Fix it!\n", 416 current->comm); 417 err = -EAFNOSUPPORT; 418 if (usin->sin_family) 419 goto out; 420 } 421 daddr = usin->sin_addr.s_addr; 422 /* ANK: I did not forget to get protocol from port field. 423 * I just do not know, who uses this weirdness. 424 * IP_HDRINCL is much more convenient. 425 */ 426 } else { 427 err = -EDESTADDRREQ; 428 if (sk->sk_state != TCP_ESTABLISHED) 429 goto out; 430 daddr = inet->daddr; 431 } 432 433 ipc.addr = inet->saddr; 434 ipc.opt = NULL; 435 ipc.oif = sk->sk_bound_dev_if; 436 437 if (msg->msg_controllen) { 438 err = ip_cmsg_send(msg, &ipc); 439 if (err) 440 goto out; 441 if (ipc.opt) 442 free = 1; 443 } 444 445 saddr = ipc.addr; 446 ipc.addr = daddr; 447 448 if (!ipc.opt) 449 ipc.opt = inet->opt; 450 451 if (ipc.opt) { 452 err = -EINVAL; 453 /* Linux does not mangle headers on raw sockets, 454 * so that IP options + IP_HDRINCL is non-sense. 455 */ 456 if (inet->hdrincl) 457 goto done; 458 if (ipc.opt->srr) { 459 if (!daddr) 460 goto done; 461 daddr = ipc.opt->faddr; 462 } 463 } 464 tos = RT_CONN_FLAGS(sk); 465 if (msg->msg_flags & MSG_DONTROUTE) 466 tos |= RTO_ONLINK; 467 468 if (MULTICAST(daddr)) { 469 if (!ipc.oif) 470 ipc.oif = inet->mc_index; 471 if (!saddr) 472 saddr = inet->mc_addr; 473 } 474 475 { 476 struct flowi fl = { .oif = ipc.oif, 477 .nl_u = { .ip4_u = 478 { .daddr = daddr, 479 .saddr = saddr, 480 .tos = tos } }, 481 .proto = inet->hdrincl ? IPPROTO_RAW : 482 sk->sk_protocol, 483 }; 484 if (!inet->hdrincl) 485 raw_probe_proto_opt(&fl, msg); 486 487 err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT)); 488 } 489 if (err) 490 goto done; 491 492 err = -EACCES; 493 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 494 goto done; 495 496 if (msg->msg_flags & MSG_CONFIRM) 497 goto do_confirm; 498 back_from_confirm: 499 500 if (inet->hdrincl) 501 err = raw_send_hdrinc(sk, msg->msg_iov, len, 502 rt, msg->msg_flags); 503 504 else { 505 if (!ipc.addr) 506 ipc.addr = rt->rt_dst; 507 lock_sock(sk); 508 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 509 &ipc, rt, msg->msg_flags); 510 if (err) 511 ip_flush_pending_frames(sk); 512 else if (!(msg->msg_flags & MSG_MORE)) 513 err = ip_push_pending_frames(sk); 514 release_sock(sk); 515 } 516 done: 517 if (free) 518 kfree(ipc.opt); 519 ip_rt_put(rt); 520 521 out: 522 if (err < 0) 523 return err; 524 return len; 525 526 do_confirm: 527 dst_confirm(&rt->u.dst); 528 if (!(msg->msg_flags & MSG_PROBE) || len) 529 goto back_from_confirm; 530 err = 0; 531 goto done; 532 } 533 534 static void raw_close(struct sock *sk, long timeout) 535 { 536 /* 537 * Raw sockets may have direct kernel refereneces. Kill them. 538 */ 539 ip_ra_control(sk, 0, NULL); 540 541 sk_common_release(sk); 542 } 543 544 /* This gets rid of all the nasties in af_inet. -DaveM */ 545 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 546 { 547 struct inet_sock *inet = inet_sk(sk); 548 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 549 int ret = -EINVAL; 550 int chk_addr_ret; 551 552 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 553 goto out; 554 chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr); 555 ret = -EADDRNOTAVAIL; 556 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 557 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 558 goto out; 559 inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; 560 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 561 inet->saddr = 0; /* Use device */ 562 sk_dst_reset(sk); 563 ret = 0; 564 out: return ret; 565 } 566 567 /* 568 * This should be easy, if there is something there 569 * we return it, otherwise we block. 570 */ 571 572 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 573 size_t len, int noblock, int flags, int *addr_len) 574 { 575 struct inet_sock *inet = inet_sk(sk); 576 size_t copied = 0; 577 int err = -EOPNOTSUPP; 578 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 579 struct sk_buff *skb; 580 581 if (flags & MSG_OOB) 582 goto out; 583 584 if (addr_len) 585 *addr_len = sizeof(*sin); 586 587 if (flags & MSG_ERRQUEUE) { 588 err = ip_recv_error(sk, msg, len); 589 goto out; 590 } 591 592 skb = skb_recv_datagram(sk, flags, noblock, &err); 593 if (!skb) 594 goto out; 595 596 copied = skb->len; 597 if (len < copied) { 598 msg->msg_flags |= MSG_TRUNC; 599 copied = len; 600 } 601 602 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 603 if (err) 604 goto done; 605 606 sock_recv_timestamp(msg, sk, skb); 607 608 /* Copy the address. */ 609 if (sin) { 610 sin->sin_family = AF_INET; 611 sin->sin_addr.s_addr = skb->nh.iph->saddr; 612 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 613 } 614 if (inet->cmsg_flags) 615 ip_cmsg_recv(msg, skb); 616 if (flags & MSG_TRUNC) 617 copied = skb->len; 618 done: 619 skb_free_datagram(sk, skb); 620 out: 621 if (err) 622 return err; 623 return copied; 624 } 625 626 static int raw_init(struct sock *sk) 627 { 628 struct raw_sock *rp = raw_sk(sk); 629 630 if (inet_sk(sk)->num == IPPROTO_ICMP) 631 memset(&rp->filter, 0, sizeof(rp->filter)); 632 return 0; 633 } 634 635 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 636 { 637 if (optlen > sizeof(struct icmp_filter)) 638 optlen = sizeof(struct icmp_filter); 639 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 640 return -EFAULT; 641 return 0; 642 } 643 644 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 645 { 646 int len, ret = -EFAULT; 647 648 if (get_user(len, optlen)) 649 goto out; 650 ret = -EINVAL; 651 if (len < 0) 652 goto out; 653 if (len > sizeof(struct icmp_filter)) 654 len = sizeof(struct icmp_filter); 655 ret = -EFAULT; 656 if (put_user(len, optlen) || 657 copy_to_user(optval, &raw_sk(sk)->filter, len)) 658 goto out; 659 ret = 0; 660 out: return ret; 661 } 662 663 static int raw_setsockopt(struct sock *sk, int level, int optname, 664 char __user *optval, int optlen) 665 { 666 if (level != SOL_RAW) 667 return ip_setsockopt(sk, level, optname, optval, optlen); 668 669 if (optname == ICMP_FILTER) { 670 if (inet_sk(sk)->num != IPPROTO_ICMP) 671 return -EOPNOTSUPP; 672 else 673 return raw_seticmpfilter(sk, optval, optlen); 674 } 675 return -ENOPROTOOPT; 676 } 677 678 static int raw_getsockopt(struct sock *sk, int level, int optname, 679 char __user *optval, int __user *optlen) 680 { 681 if (level != SOL_RAW) 682 return ip_getsockopt(sk, level, optname, optval, optlen); 683 684 if (optname == ICMP_FILTER) { 685 if (inet_sk(sk)->num != IPPROTO_ICMP) 686 return -EOPNOTSUPP; 687 else 688 return raw_geticmpfilter(sk, optval, optlen); 689 } 690 return -ENOPROTOOPT; 691 } 692 693 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 694 { 695 switch (cmd) { 696 case SIOCOUTQ: { 697 int amount = atomic_read(&sk->sk_wmem_alloc); 698 return put_user(amount, (int __user *)arg); 699 } 700 case SIOCINQ: { 701 struct sk_buff *skb; 702 int amount = 0; 703 704 spin_lock_bh(&sk->sk_receive_queue.lock); 705 skb = skb_peek(&sk->sk_receive_queue); 706 if (skb != NULL) 707 amount = skb->len; 708 spin_unlock_bh(&sk->sk_receive_queue.lock); 709 return put_user(amount, (int __user *)arg); 710 } 711 712 default: 713 #ifdef CONFIG_IP_MROUTE 714 return ipmr_ioctl(sk, cmd, (void __user *)arg); 715 #else 716 return -ENOIOCTLCMD; 717 #endif 718 } 719 } 720 721 struct proto raw_prot = { 722 .name = "RAW", 723 .owner = THIS_MODULE, 724 .close = raw_close, 725 .connect = ip4_datagram_connect, 726 .disconnect = udp_disconnect, 727 .ioctl = raw_ioctl, 728 .init = raw_init, 729 .setsockopt = raw_setsockopt, 730 .getsockopt = raw_getsockopt, 731 .sendmsg = raw_sendmsg, 732 .recvmsg = raw_recvmsg, 733 .bind = raw_bind, 734 .backlog_rcv = raw_rcv_skb, 735 .hash = raw_v4_hash, 736 .unhash = raw_v4_unhash, 737 .obj_size = sizeof(struct raw_sock), 738 }; 739 740 #ifdef CONFIG_PROC_FS 741 struct raw_iter_state { 742 int bucket; 743 }; 744 745 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private) 746 747 static struct sock *raw_get_first(struct seq_file *seq) 748 { 749 struct sock *sk; 750 struct raw_iter_state* state = raw_seq_private(seq); 751 752 for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) { 753 struct hlist_node *node; 754 755 sk_for_each(sk, node, &raw_v4_htable[state->bucket]) 756 if (sk->sk_family == PF_INET) 757 goto found; 758 } 759 sk = NULL; 760 found: 761 return sk; 762 } 763 764 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 765 { 766 struct raw_iter_state* state = raw_seq_private(seq); 767 768 do { 769 sk = sk_next(sk); 770 try_again: 771 ; 772 } while (sk && sk->sk_family != PF_INET); 773 774 if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) { 775 sk = sk_head(&raw_v4_htable[state->bucket]); 776 goto try_again; 777 } 778 return sk; 779 } 780 781 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 782 { 783 struct sock *sk = raw_get_first(seq); 784 785 if (sk) 786 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 787 --pos; 788 return pos ? NULL : sk; 789 } 790 791 static void *raw_seq_start(struct seq_file *seq, loff_t *pos) 792 { 793 read_lock(&raw_v4_lock); 794 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 795 } 796 797 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 798 { 799 struct sock *sk; 800 801 if (v == SEQ_START_TOKEN) 802 sk = raw_get_first(seq); 803 else 804 sk = raw_get_next(seq, v); 805 ++*pos; 806 return sk; 807 } 808 809 static void raw_seq_stop(struct seq_file *seq, void *v) 810 { 811 read_unlock(&raw_v4_lock); 812 } 813 814 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i) 815 { 816 struct inet_sock *inet = inet_sk(sp); 817 unsigned int dest = inet->daddr, 818 src = inet->rcv_saddr; 819 __u16 destp = 0, 820 srcp = inet->num; 821 822 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" 823 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", 824 i, src, srcp, dest, destp, sp->sk_state, 825 atomic_read(&sp->sk_wmem_alloc), 826 atomic_read(&sp->sk_rmem_alloc), 827 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 828 atomic_read(&sp->sk_refcnt), sp); 829 return tmpbuf; 830 } 831 832 static int raw_seq_show(struct seq_file *seq, void *v) 833 { 834 char tmpbuf[129]; 835 836 if (v == SEQ_START_TOKEN) 837 seq_printf(seq, "%-127s\n", 838 " sl local_address rem_address st tx_queue " 839 "rx_queue tr tm->when retrnsmt uid timeout " 840 "inode"); 841 else { 842 struct raw_iter_state *state = raw_seq_private(seq); 843 844 seq_printf(seq, "%-127s\n", 845 get_raw_sock(v, tmpbuf, state->bucket)); 846 } 847 return 0; 848 } 849 850 static struct seq_operations raw_seq_ops = { 851 .start = raw_seq_start, 852 .next = raw_seq_next, 853 .stop = raw_seq_stop, 854 .show = raw_seq_show, 855 }; 856 857 static int raw_seq_open(struct inode *inode, struct file *file) 858 { 859 struct seq_file *seq; 860 int rc = -ENOMEM; 861 struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); 862 863 if (!s) 864 goto out; 865 rc = seq_open(file, &raw_seq_ops); 866 if (rc) 867 goto out_kfree; 868 869 seq = file->private_data; 870 seq->private = s; 871 memset(s, 0, sizeof(*s)); 872 out: 873 return rc; 874 out_kfree: 875 kfree(s); 876 goto out; 877 } 878 879 static struct file_operations raw_seq_fops = { 880 .owner = THIS_MODULE, 881 .open = raw_seq_open, 882 .read = seq_read, 883 .llseek = seq_lseek, 884 .release = seq_release_private, 885 }; 886 887 int __init raw_proc_init(void) 888 { 889 if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops)) 890 return -ENOMEM; 891 return 0; 892 } 893 894 void __init raw_proc_exit(void) 895 { 896 proc_net_remove("raw"); 897 } 898 #endif /* CONFIG_PROC_FS */ 899