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 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * 11 * Fixes: 12 * Alan Cox : verify_area() fixed up 13 * Alan Cox : ICMP error handling 14 * Alan Cox : EMSGSIZE if you send too big a packet 15 * Alan Cox : Now uses generic datagrams and shared 16 * skbuff library. No more peek crashes, 17 * no more backlogs 18 * Alan Cox : Checks sk->broadcast. 19 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 20 * Alan Cox : Raw passes ip options too 21 * Alan Cox : Setsocketopt added 22 * Alan Cox : Fixed error return for broadcasts 23 * Alan Cox : Removed wake_up calls 24 * Alan Cox : Use ttl/tos 25 * Alan Cox : Cleaned up old debugging 26 * Alan Cox : Use new kernel side addresses 27 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 28 * Alan Cox : BSD style RAW socket demultiplexing. 29 * Alan Cox : Beginnings of mrouted support. 30 * Alan Cox : Added IP_HDRINCL option. 31 * Alan Cox : Skip broadcast check if BSDism set. 32 * David S. Miller : New socket lookup architecture. 33 * 34 * This program is free software; you can redistribute it and/or 35 * modify it under the terms of the GNU General Public License 36 * as published by the Free Software Foundation; either version 37 * 2 of the License, or (at your option) any later version. 38 */ 39 40 #include <linux/types.h> 41 #include <asm/atomic.h> 42 #include <asm/byteorder.h> 43 #include <asm/current.h> 44 #include <asm/uaccess.h> 45 #include <asm/ioctls.h> 46 #include <linux/stddef.h> 47 #include <linux/slab.h> 48 #include <linux/errno.h> 49 #include <linux/aio.h> 50 #include <linux/kernel.h> 51 #include <linux/spinlock.h> 52 #include <linux/sockios.h> 53 #include <linux/socket.h> 54 #include <linux/in.h> 55 #include <linux/mroute.h> 56 #include <linux/netdevice.h> 57 #include <linux/in_route.h> 58 #include <linux/route.h> 59 #include <linux/skbuff.h> 60 #include <net/net_namespace.h> 61 #include <net/dst.h> 62 #include <net/sock.h> 63 #include <linux/ip.h> 64 #include <linux/net.h> 65 #include <net/ip.h> 66 #include <net/icmp.h> 67 #include <net/udp.h> 68 #include <net/raw.h> 69 #include <net/snmp.h> 70 #include <net/tcp_states.h> 71 #include <net/inet_common.h> 72 #include <net/checksum.h> 73 #include <net/xfrm.h> 74 #include <linux/rtnetlink.h> 75 #include <linux/proc_fs.h> 76 #include <linux/seq_file.h> 77 #include <linux/netfilter.h> 78 #include <linux/netfilter_ipv4.h> 79 80 static struct raw_hashinfo raw_v4_hashinfo = { 81 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 82 }; 83 84 void raw_hash_sk(struct sock *sk) 85 { 86 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 87 struct hlist_head *head; 88 89 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 90 91 write_lock_bh(&h->lock); 92 sk_add_node(sk, head); 93 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 94 write_unlock_bh(&h->lock); 95 } 96 EXPORT_SYMBOL_GPL(raw_hash_sk); 97 98 void raw_unhash_sk(struct sock *sk) 99 { 100 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 101 102 write_lock_bh(&h->lock); 103 if (sk_del_node_init(sk)) 104 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 105 write_unlock_bh(&h->lock); 106 } 107 EXPORT_SYMBOL_GPL(raw_unhash_sk); 108 109 static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, 110 unsigned short num, __be32 raddr, __be32 laddr, int dif) 111 { 112 struct hlist_node *node; 113 114 sk_for_each_from(sk, node) { 115 struct inet_sock *inet = inet_sk(sk); 116 117 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 118 !(inet->inet_daddr && inet->inet_daddr != raddr) && 119 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 120 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) 121 goto found; /* gotcha */ 122 } 123 sk = NULL; 124 found: 125 return sk; 126 } 127 128 /* 129 * 0 - deliver 130 * 1 - block 131 */ 132 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb) 133 { 134 int type; 135 136 if (!pskb_may_pull(skb, sizeof(struct icmphdr))) 137 return 1; 138 139 type = icmp_hdr(skb)->type; 140 if (type < 32) { 141 __u32 data = raw_sk(sk)->filter.data; 142 143 return ((1 << type) & data) != 0; 144 } 145 146 /* Do not block unknown ICMP types */ 147 return 0; 148 } 149 150 /* IP input processing comes here for RAW socket delivery. 151 * Caller owns SKB, so we must make clones. 152 * 153 * RFC 1122: SHOULD pass TOS value up to the transport layer. 154 * -> It does. And not only TOS, but all IP header. 155 */ 156 static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash) 157 { 158 struct sock *sk; 159 struct hlist_head *head; 160 int delivered = 0; 161 struct net *net; 162 163 read_lock(&raw_v4_hashinfo.lock); 164 head = &raw_v4_hashinfo.ht[hash]; 165 if (hlist_empty(head)) 166 goto out; 167 168 net = dev_net(skb->dev); 169 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, 170 iph->saddr, iph->daddr, 171 skb->dev->ifindex); 172 173 while (sk) { 174 delivered = 1; 175 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) { 176 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 177 178 /* Not releasing hash table! */ 179 if (clone) 180 raw_rcv(sk, clone); 181 } 182 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, 183 iph->saddr, iph->daddr, 184 skb->dev->ifindex); 185 } 186 out: 187 read_unlock(&raw_v4_hashinfo.lock); 188 return delivered; 189 } 190 191 int raw_local_deliver(struct sk_buff *skb, int protocol) 192 { 193 int hash; 194 struct sock *raw_sk; 195 196 hash = protocol & (RAW_HTABLE_SIZE - 1); 197 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 198 199 /* If there maybe a raw socket we must check - if not we 200 * don't care less 201 */ 202 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) 203 raw_sk = NULL; 204 205 return raw_sk != NULL; 206 207 } 208 209 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 210 { 211 struct inet_sock *inet = inet_sk(sk); 212 const int type = icmp_hdr(skb)->type; 213 const int code = icmp_hdr(skb)->code; 214 int err = 0; 215 int harderr = 0; 216 217 /* Report error on raw socket, if: 218 1. User requested ip_recverr. 219 2. Socket is connected (otherwise the error indication 220 is useless without ip_recverr and error is hard. 221 */ 222 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 223 return; 224 225 switch (type) { 226 default: 227 case ICMP_TIME_EXCEEDED: 228 err = EHOSTUNREACH; 229 break; 230 case ICMP_SOURCE_QUENCH: 231 return; 232 case ICMP_PARAMETERPROB: 233 err = EPROTO; 234 harderr = 1; 235 break; 236 case ICMP_DEST_UNREACH: 237 err = EHOSTUNREACH; 238 if (code > NR_ICMP_UNREACH) 239 break; 240 err = icmp_err_convert[code].errno; 241 harderr = icmp_err_convert[code].fatal; 242 if (code == ICMP_FRAG_NEEDED) { 243 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 244 err = EMSGSIZE; 245 } 246 } 247 248 if (inet->recverr) { 249 struct iphdr *iph = (struct iphdr *)skb->data; 250 u8 *payload = skb->data + (iph->ihl << 2); 251 252 if (inet->hdrincl) 253 payload = skb->data; 254 ip_icmp_error(sk, skb, err, 0, info, payload); 255 } 256 257 if (inet->recverr || harderr) { 258 sk->sk_err = err; 259 sk->sk_error_report(sk); 260 } 261 } 262 263 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 264 { 265 int hash; 266 struct sock *raw_sk; 267 struct iphdr *iph; 268 struct net *net; 269 270 hash = protocol & (RAW_HTABLE_SIZE - 1); 271 272 read_lock(&raw_v4_hashinfo.lock); 273 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 274 if (raw_sk != NULL) { 275 iph = (struct iphdr *)skb->data; 276 net = dev_net(skb->dev); 277 278 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 279 iph->daddr, iph->saddr, 280 skb->dev->ifindex)) != NULL) { 281 raw_err(raw_sk, skb, info); 282 raw_sk = sk_next(raw_sk); 283 iph = (struct iphdr *)skb->data; 284 } 285 } 286 read_unlock(&raw_v4_hashinfo.lock); 287 } 288 289 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb) 290 { 291 /* Charge it to the socket. */ 292 293 if (sock_queue_rcv_skb(sk, skb) < 0) { 294 kfree_skb(skb); 295 return NET_RX_DROP; 296 } 297 298 return NET_RX_SUCCESS; 299 } 300 301 int raw_rcv(struct sock *sk, struct sk_buff *skb) 302 { 303 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 304 atomic_inc(&sk->sk_drops); 305 kfree_skb(skb); 306 return NET_RX_DROP; 307 } 308 nf_reset(skb); 309 310 skb_push(skb, skb->data - skb_network_header(skb)); 311 312 raw_rcv_skb(sk, skb); 313 return 0; 314 } 315 316 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length, 317 struct rtable *rt, 318 unsigned int flags) 319 { 320 struct inet_sock *inet = inet_sk(sk); 321 struct net *net = sock_net(sk); 322 struct iphdr *iph; 323 struct sk_buff *skb; 324 unsigned int iphlen; 325 int err; 326 327 if (length > rt->u.dst.dev->mtu) { 328 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport, 329 rt->u.dst.dev->mtu); 330 return -EMSGSIZE; 331 } 332 if (flags&MSG_PROBE) 333 goto out; 334 335 skb = sock_alloc_send_skb(sk, 336 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15, 337 flags & MSG_DONTWAIT, &err); 338 if (skb == NULL) 339 goto error; 340 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev)); 341 342 skb->priority = sk->sk_priority; 343 skb->mark = sk->sk_mark; 344 skb_dst_set(skb, dst_clone(&rt->u.dst)); 345 346 skb_reset_network_header(skb); 347 iph = ip_hdr(skb); 348 skb_put(skb, length); 349 350 skb->ip_summed = CHECKSUM_NONE; 351 352 skb->transport_header = skb->network_header; 353 err = -EFAULT; 354 if (memcpy_fromiovecend((void *)iph, from, 0, length)) 355 goto error_free; 356 357 iphlen = iph->ihl * 4; 358 359 /* 360 * We don't want to modify the ip header, but we do need to 361 * be sure that it won't cause problems later along the network 362 * stack. Specifically we want to make sure that iph->ihl is a 363 * sane value. If ihl points beyond the length of the buffer passed 364 * in, reject the frame as invalid 365 */ 366 err = -EINVAL; 367 if (iphlen > length) 368 goto error_free; 369 370 if (iphlen >= sizeof(*iph)) { 371 if (!iph->saddr) 372 iph->saddr = rt->rt_src; 373 iph->check = 0; 374 iph->tot_len = htons(length); 375 if (!iph->id) 376 ip_select_ident(iph, &rt->u.dst, NULL); 377 378 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 379 } 380 if (iph->protocol == IPPROTO_ICMP) 381 icmp_out_count(net, ((struct icmphdr *) 382 skb_transport_header(skb))->type); 383 384 err = NF_HOOK(PF_INET, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev, 385 dst_output); 386 if (err > 0) 387 err = net_xmit_errno(err); 388 if (err) 389 goto error; 390 out: 391 return 0; 392 393 error_free: 394 kfree_skb(skb); 395 error: 396 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 397 if (err == -ENOBUFS && !inet->recverr) 398 err = 0; 399 return err; 400 } 401 402 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 403 { 404 struct iovec *iov; 405 u8 __user *type = NULL; 406 u8 __user *code = NULL; 407 int probed = 0; 408 unsigned int i; 409 410 if (!msg->msg_iov) 411 return 0; 412 413 for (i = 0; i < msg->msg_iovlen; i++) { 414 iov = &msg->msg_iov[i]; 415 if (!iov) 416 continue; 417 418 switch (fl->proto) { 419 case IPPROTO_ICMP: 420 /* check if one-byte field is readable or not. */ 421 if (iov->iov_base && iov->iov_len < 1) 422 break; 423 424 if (!type) { 425 type = iov->iov_base; 426 /* check if code field is readable or not. */ 427 if (iov->iov_len > 1) 428 code = type + 1; 429 } else if (!code) 430 code = iov->iov_base; 431 432 if (type && code) { 433 if (get_user(fl->fl_icmp_type, type) || 434 get_user(fl->fl_icmp_code, code)) 435 return -EFAULT; 436 probed = 1; 437 } 438 break; 439 default: 440 probed = 1; 441 break; 442 } 443 if (probed) 444 break; 445 } 446 return 0; 447 } 448 449 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 450 size_t len) 451 { 452 struct inet_sock *inet = inet_sk(sk); 453 struct ipcm_cookie ipc; 454 struct rtable *rt = NULL; 455 int free = 0; 456 __be32 daddr; 457 __be32 saddr; 458 u8 tos; 459 int err; 460 461 err = -EMSGSIZE; 462 if (len > 0xFFFF) 463 goto out; 464 465 /* 466 * Check the flags. 467 */ 468 469 err = -EOPNOTSUPP; 470 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 471 goto out; /* compatibility */ 472 473 /* 474 * Get and verify the address. 475 */ 476 477 if (msg->msg_namelen) { 478 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; 479 err = -EINVAL; 480 if (msg->msg_namelen < sizeof(*usin)) 481 goto out; 482 if (usin->sin_family != AF_INET) { 483 static int complained; 484 if (!complained++) 485 printk(KERN_INFO "%s forgot to set AF_INET in " 486 "raw sendmsg. Fix it!\n", 487 current->comm); 488 err = -EAFNOSUPPORT; 489 if (usin->sin_family) 490 goto out; 491 } 492 daddr = usin->sin_addr.s_addr; 493 /* ANK: I did not forget to get protocol from port field. 494 * I just do not know, who uses this weirdness. 495 * IP_HDRINCL is much more convenient. 496 */ 497 } else { 498 err = -EDESTADDRREQ; 499 if (sk->sk_state != TCP_ESTABLISHED) 500 goto out; 501 daddr = inet->inet_daddr; 502 } 503 504 ipc.addr = inet->inet_saddr; 505 ipc.opt = NULL; 506 ipc.shtx.flags = 0; 507 ipc.oif = sk->sk_bound_dev_if; 508 509 if (msg->msg_controllen) { 510 err = ip_cmsg_send(sock_net(sk), msg, &ipc); 511 if (err) 512 goto out; 513 if (ipc.opt) 514 free = 1; 515 } 516 517 saddr = ipc.addr; 518 ipc.addr = daddr; 519 520 if (!ipc.opt) 521 ipc.opt = inet->opt; 522 523 if (ipc.opt) { 524 err = -EINVAL; 525 /* Linux does not mangle headers on raw sockets, 526 * so that IP options + IP_HDRINCL is non-sense. 527 */ 528 if (inet->hdrincl) 529 goto done; 530 if (ipc.opt->srr) { 531 if (!daddr) 532 goto done; 533 daddr = ipc.opt->faddr; 534 } 535 } 536 tos = RT_CONN_FLAGS(sk); 537 if (msg->msg_flags & MSG_DONTROUTE) 538 tos |= RTO_ONLINK; 539 540 if (ipv4_is_multicast(daddr)) { 541 if (!ipc.oif) 542 ipc.oif = inet->mc_index; 543 if (!saddr) 544 saddr = inet->mc_addr; 545 } 546 547 { 548 struct flowi fl = { .oif = ipc.oif, 549 .mark = sk->sk_mark, 550 .nl_u = { .ip4_u = 551 { .daddr = daddr, 552 .saddr = saddr, 553 .tos = tos } }, 554 .proto = inet->hdrincl ? IPPROTO_RAW : 555 sk->sk_protocol, 556 }; 557 if (!inet->hdrincl) { 558 err = raw_probe_proto_opt(&fl, msg); 559 if (err) 560 goto done; 561 } 562 563 security_sk_classify_flow(sk, &fl); 564 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1); 565 } 566 if (err) 567 goto done; 568 569 err = -EACCES; 570 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 571 goto done; 572 573 if (msg->msg_flags & MSG_CONFIRM) 574 goto do_confirm; 575 back_from_confirm: 576 577 if (inet->hdrincl) 578 err = raw_send_hdrinc(sk, msg->msg_iov, len, 579 rt, msg->msg_flags); 580 581 else { 582 if (!ipc.addr) 583 ipc.addr = rt->rt_dst; 584 lock_sock(sk); 585 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 586 &ipc, &rt, msg->msg_flags); 587 if (err) 588 ip_flush_pending_frames(sk); 589 else if (!(msg->msg_flags & MSG_MORE)) { 590 err = ip_push_pending_frames(sk); 591 if (err == -ENOBUFS && !inet->recverr) 592 err = 0; 593 } 594 release_sock(sk); 595 } 596 done: 597 if (free) 598 kfree(ipc.opt); 599 ip_rt_put(rt); 600 601 out: 602 if (err < 0) 603 return err; 604 return len; 605 606 do_confirm: 607 dst_confirm(&rt->u.dst); 608 if (!(msg->msg_flags & MSG_PROBE) || len) 609 goto back_from_confirm; 610 err = 0; 611 goto done; 612 } 613 614 static void raw_close(struct sock *sk, long timeout) 615 { 616 /* 617 * Raw sockets may have direct kernel refereneces. Kill them. 618 */ 619 ip_ra_control(sk, 0, NULL); 620 621 sk_common_release(sk); 622 } 623 624 static void raw_destroy(struct sock *sk) 625 { 626 lock_sock(sk); 627 ip_flush_pending_frames(sk); 628 release_sock(sk); 629 } 630 631 /* This gets rid of all the nasties in af_inet. -DaveM */ 632 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 633 { 634 struct inet_sock *inet = inet_sk(sk); 635 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 636 int ret = -EINVAL; 637 int chk_addr_ret; 638 639 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 640 goto out; 641 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 642 ret = -EADDRNOTAVAIL; 643 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 644 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 645 goto out; 646 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 647 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 648 inet->inet_saddr = 0; /* Use device */ 649 sk_dst_reset(sk); 650 ret = 0; 651 out: return ret; 652 } 653 654 /* 655 * This should be easy, if there is something there 656 * we return it, otherwise we block. 657 */ 658 659 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 660 size_t len, int noblock, int flags, int *addr_len) 661 { 662 struct inet_sock *inet = inet_sk(sk); 663 size_t copied = 0; 664 int err = -EOPNOTSUPP; 665 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 666 struct sk_buff *skb; 667 668 if (flags & MSG_OOB) 669 goto out; 670 671 if (addr_len) 672 *addr_len = sizeof(*sin); 673 674 if (flags & MSG_ERRQUEUE) { 675 err = ip_recv_error(sk, msg, len); 676 goto out; 677 } 678 679 skb = skb_recv_datagram(sk, flags, noblock, &err); 680 if (!skb) 681 goto out; 682 683 copied = skb->len; 684 if (len < copied) { 685 msg->msg_flags |= MSG_TRUNC; 686 copied = len; 687 } 688 689 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 690 if (err) 691 goto done; 692 693 sock_recv_ts_and_drops(msg, sk, skb); 694 695 /* Copy the address. */ 696 if (sin) { 697 sin->sin_family = AF_INET; 698 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 699 sin->sin_port = 0; 700 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 701 } 702 if (inet->cmsg_flags) 703 ip_cmsg_recv(msg, skb); 704 if (flags & MSG_TRUNC) 705 copied = skb->len; 706 done: 707 skb_free_datagram(sk, skb); 708 out: 709 if (err) 710 return err; 711 return copied; 712 } 713 714 static int raw_init(struct sock *sk) 715 { 716 struct raw_sock *rp = raw_sk(sk); 717 718 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 719 memset(&rp->filter, 0, sizeof(rp->filter)); 720 return 0; 721 } 722 723 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 724 { 725 if (optlen > sizeof(struct icmp_filter)) 726 optlen = sizeof(struct icmp_filter); 727 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 728 return -EFAULT; 729 return 0; 730 } 731 732 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 733 { 734 int len, ret = -EFAULT; 735 736 if (get_user(len, optlen)) 737 goto out; 738 ret = -EINVAL; 739 if (len < 0) 740 goto out; 741 if (len > sizeof(struct icmp_filter)) 742 len = sizeof(struct icmp_filter); 743 ret = -EFAULT; 744 if (put_user(len, optlen) || 745 copy_to_user(optval, &raw_sk(sk)->filter, len)) 746 goto out; 747 ret = 0; 748 out: return ret; 749 } 750 751 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 752 char __user *optval, unsigned int optlen) 753 { 754 if (optname == ICMP_FILTER) { 755 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 756 return -EOPNOTSUPP; 757 else 758 return raw_seticmpfilter(sk, optval, optlen); 759 } 760 return -ENOPROTOOPT; 761 } 762 763 static int raw_setsockopt(struct sock *sk, int level, int optname, 764 char __user *optval, unsigned int optlen) 765 { 766 if (level != SOL_RAW) 767 return ip_setsockopt(sk, level, optname, optval, optlen); 768 return do_raw_setsockopt(sk, level, optname, optval, optlen); 769 } 770 771 #ifdef CONFIG_COMPAT 772 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 773 char __user *optval, unsigned int optlen) 774 { 775 if (level != SOL_RAW) 776 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 777 return do_raw_setsockopt(sk, level, optname, optval, optlen); 778 } 779 #endif 780 781 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 782 char __user *optval, int __user *optlen) 783 { 784 if (optname == ICMP_FILTER) { 785 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 786 return -EOPNOTSUPP; 787 else 788 return raw_geticmpfilter(sk, optval, optlen); 789 } 790 return -ENOPROTOOPT; 791 } 792 793 static int raw_getsockopt(struct sock *sk, int level, int optname, 794 char __user *optval, int __user *optlen) 795 { 796 if (level != SOL_RAW) 797 return ip_getsockopt(sk, level, optname, optval, optlen); 798 return do_raw_getsockopt(sk, level, optname, optval, optlen); 799 } 800 801 #ifdef CONFIG_COMPAT 802 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 803 char __user *optval, int __user *optlen) 804 { 805 if (level != SOL_RAW) 806 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 807 return do_raw_getsockopt(sk, level, optname, optval, optlen); 808 } 809 #endif 810 811 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 812 { 813 switch (cmd) { 814 case SIOCOUTQ: { 815 int amount = sk_wmem_alloc_get(sk); 816 817 return put_user(amount, (int __user *)arg); 818 } 819 case SIOCINQ: { 820 struct sk_buff *skb; 821 int amount = 0; 822 823 spin_lock_bh(&sk->sk_receive_queue.lock); 824 skb = skb_peek(&sk->sk_receive_queue); 825 if (skb != NULL) 826 amount = skb->len; 827 spin_unlock_bh(&sk->sk_receive_queue.lock); 828 return put_user(amount, (int __user *)arg); 829 } 830 831 default: 832 #ifdef CONFIG_IP_MROUTE 833 return ipmr_ioctl(sk, cmd, (void __user *)arg); 834 #else 835 return -ENOIOCTLCMD; 836 #endif 837 } 838 } 839 840 struct proto raw_prot = { 841 .name = "RAW", 842 .owner = THIS_MODULE, 843 .close = raw_close, 844 .destroy = raw_destroy, 845 .connect = ip4_datagram_connect, 846 .disconnect = udp_disconnect, 847 .ioctl = raw_ioctl, 848 .init = raw_init, 849 .setsockopt = raw_setsockopt, 850 .getsockopt = raw_getsockopt, 851 .sendmsg = raw_sendmsg, 852 .recvmsg = raw_recvmsg, 853 .bind = raw_bind, 854 .backlog_rcv = raw_rcv_skb, 855 .hash = raw_hash_sk, 856 .unhash = raw_unhash_sk, 857 .obj_size = sizeof(struct raw_sock), 858 .h.raw_hash = &raw_v4_hashinfo, 859 #ifdef CONFIG_COMPAT 860 .compat_setsockopt = compat_raw_setsockopt, 861 .compat_getsockopt = compat_raw_getsockopt, 862 #endif 863 }; 864 865 #ifdef CONFIG_PROC_FS 866 static struct sock *raw_get_first(struct seq_file *seq) 867 { 868 struct sock *sk; 869 struct raw_iter_state *state = raw_seq_private(seq); 870 871 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 872 ++state->bucket) { 873 struct hlist_node *node; 874 875 sk_for_each(sk, node, &state->h->ht[state->bucket]) 876 if (sock_net(sk) == seq_file_net(seq)) 877 goto found; 878 } 879 sk = NULL; 880 found: 881 return sk; 882 } 883 884 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 885 { 886 struct raw_iter_state *state = raw_seq_private(seq); 887 888 do { 889 sk = sk_next(sk); 890 try_again: 891 ; 892 } while (sk && sock_net(sk) != seq_file_net(seq)); 893 894 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 895 sk = sk_head(&state->h->ht[state->bucket]); 896 goto try_again; 897 } 898 return sk; 899 } 900 901 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 902 { 903 struct sock *sk = raw_get_first(seq); 904 905 if (sk) 906 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 907 --pos; 908 return pos ? NULL : sk; 909 } 910 911 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 912 { 913 struct raw_iter_state *state = raw_seq_private(seq); 914 915 read_lock(&state->h->lock); 916 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 917 } 918 EXPORT_SYMBOL_GPL(raw_seq_start); 919 920 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 921 { 922 struct sock *sk; 923 924 if (v == SEQ_START_TOKEN) 925 sk = raw_get_first(seq); 926 else 927 sk = raw_get_next(seq, v); 928 ++*pos; 929 return sk; 930 } 931 EXPORT_SYMBOL_GPL(raw_seq_next); 932 933 void raw_seq_stop(struct seq_file *seq, void *v) 934 { 935 struct raw_iter_state *state = raw_seq_private(seq); 936 937 read_unlock(&state->h->lock); 938 } 939 EXPORT_SYMBOL_GPL(raw_seq_stop); 940 941 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 942 { 943 struct inet_sock *inet = inet_sk(sp); 944 __be32 dest = inet->inet_daddr, 945 src = inet->inet_rcv_saddr; 946 __u16 destp = 0, 947 srcp = inet->inet_num; 948 949 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 950 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 951 i, src, srcp, dest, destp, sp->sk_state, 952 sk_wmem_alloc_get(sp), 953 sk_rmem_alloc_get(sp), 954 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 955 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 956 } 957 958 static int raw_seq_show(struct seq_file *seq, void *v) 959 { 960 if (v == SEQ_START_TOKEN) 961 seq_printf(seq, " sl local_address rem_address st tx_queue " 962 "rx_queue tr tm->when retrnsmt uid timeout " 963 "inode ref pointer drops\n"); 964 else 965 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 966 return 0; 967 } 968 969 static const struct seq_operations raw_seq_ops = { 970 .start = raw_seq_start, 971 .next = raw_seq_next, 972 .stop = raw_seq_stop, 973 .show = raw_seq_show, 974 }; 975 976 int raw_seq_open(struct inode *ino, struct file *file, 977 struct raw_hashinfo *h, const struct seq_operations *ops) 978 { 979 int err; 980 struct raw_iter_state *i; 981 982 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 983 if (err < 0) 984 return err; 985 986 i = raw_seq_private((struct seq_file *)file->private_data); 987 i->h = h; 988 return 0; 989 } 990 EXPORT_SYMBOL_GPL(raw_seq_open); 991 992 static int raw_v4_seq_open(struct inode *inode, struct file *file) 993 { 994 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 995 } 996 997 static const struct file_operations raw_seq_fops = { 998 .owner = THIS_MODULE, 999 .open = raw_v4_seq_open, 1000 .read = seq_read, 1001 .llseek = seq_lseek, 1002 .release = seq_release_net, 1003 }; 1004 1005 static __net_init int raw_init_net(struct net *net) 1006 { 1007 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) 1008 return -ENOMEM; 1009 1010 return 0; 1011 } 1012 1013 static __net_exit void raw_exit_net(struct net *net) 1014 { 1015 proc_net_remove(net, "raw"); 1016 } 1017 1018 static __net_initdata struct pernet_operations raw_net_ops = { 1019 .init = raw_init_net, 1020 .exit = raw_exit_net, 1021 }; 1022 1023 int __init raw_proc_init(void) 1024 { 1025 return register_pernet_subsys(&raw_net_ops); 1026 } 1027 1028 void __init raw_proc_exit(void) 1029 { 1030 unregister_pernet_subsys(&raw_net_ops); 1031 } 1032 #endif /* CONFIG_PROC_FS */ 1033