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 (ip_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 **rtp, 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 struct rtable *rt = *rtp; 327 328 if (length > rt->dst.dev->mtu) { 329 ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->inet_dport, 330 rt->dst.dev->mtu); 331 return -EMSGSIZE; 332 } 333 if (flags&MSG_PROBE) 334 goto out; 335 336 skb = sock_alloc_send_skb(sk, 337 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15, 338 flags & MSG_DONTWAIT, &err); 339 if (skb == NULL) 340 goto error; 341 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev)); 342 343 skb->priority = sk->sk_priority; 344 skb->mark = sk->sk_mark; 345 skb_dst_set(skb, &rt->dst); 346 *rtp = NULL; 347 348 skb_reset_network_header(skb); 349 iph = ip_hdr(skb); 350 skb_put(skb, length); 351 352 skb->ip_summed = CHECKSUM_NONE; 353 354 skb->transport_header = skb->network_header; 355 err = -EFAULT; 356 if (memcpy_fromiovecend((void *)iph, from, 0, length)) 357 goto error_free; 358 359 iphlen = iph->ihl * 4; 360 361 /* 362 * We don't want to modify the ip header, but we do need to 363 * be sure that it won't cause problems later along the network 364 * stack. Specifically we want to make sure that iph->ihl is a 365 * sane value. If ihl points beyond the length of the buffer passed 366 * in, reject the frame as invalid 367 */ 368 err = -EINVAL; 369 if (iphlen > length) 370 goto error_free; 371 372 if (iphlen >= sizeof(*iph)) { 373 if (!iph->saddr) 374 iph->saddr = rt->rt_src; 375 iph->check = 0; 376 iph->tot_len = htons(length); 377 if (!iph->id) 378 ip_select_ident(iph, &rt->dst, NULL); 379 380 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 381 } 382 if (iph->protocol == IPPROTO_ICMP) 383 icmp_out_count(net, ((struct icmphdr *) 384 skb_transport_header(skb))->type); 385 386 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL, 387 rt->dst.dev, dst_output); 388 if (err > 0) 389 err = net_xmit_errno(err); 390 if (err) 391 goto error; 392 out: 393 return 0; 394 395 error_free: 396 kfree_skb(skb); 397 error: 398 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 399 if (err == -ENOBUFS && !inet->recverr) 400 err = 0; 401 return err; 402 } 403 404 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg) 405 { 406 struct iovec *iov; 407 u8 __user *type = NULL; 408 u8 __user *code = NULL; 409 int probed = 0; 410 unsigned int i; 411 412 if (!msg->msg_iov) 413 return 0; 414 415 for (i = 0; i < msg->msg_iovlen; i++) { 416 iov = &msg->msg_iov[i]; 417 if (!iov) 418 continue; 419 420 switch (fl->proto) { 421 case IPPROTO_ICMP: 422 /* check if one-byte field is readable or not. */ 423 if (iov->iov_base && iov->iov_len < 1) 424 break; 425 426 if (!type) { 427 type = iov->iov_base; 428 /* check if code field is readable or not. */ 429 if (iov->iov_len > 1) 430 code = type + 1; 431 } else if (!code) 432 code = iov->iov_base; 433 434 if (type && code) { 435 if (get_user(fl->fl_icmp_type, type) || 436 get_user(fl->fl_icmp_code, code)) 437 return -EFAULT; 438 probed = 1; 439 } 440 break; 441 default: 442 probed = 1; 443 break; 444 } 445 if (probed) 446 break; 447 } 448 return 0; 449 } 450 451 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 452 size_t len) 453 { 454 struct inet_sock *inet = inet_sk(sk); 455 struct ipcm_cookie ipc; 456 struct rtable *rt = NULL; 457 int free = 0; 458 __be32 daddr; 459 __be32 saddr; 460 u8 tos; 461 int err; 462 463 err = -EMSGSIZE; 464 if (len > 0xFFFF) 465 goto out; 466 467 /* 468 * Check the flags. 469 */ 470 471 err = -EOPNOTSUPP; 472 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 473 goto out; /* compatibility */ 474 475 /* 476 * Get and verify the address. 477 */ 478 479 if (msg->msg_namelen) { 480 struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; 481 err = -EINVAL; 482 if (msg->msg_namelen < sizeof(*usin)) 483 goto out; 484 if (usin->sin_family != AF_INET) { 485 static int complained; 486 if (!complained++) 487 printk(KERN_INFO "%s forgot to set AF_INET in " 488 "raw sendmsg. Fix it!\n", 489 current->comm); 490 err = -EAFNOSUPPORT; 491 if (usin->sin_family) 492 goto out; 493 } 494 daddr = usin->sin_addr.s_addr; 495 /* ANK: I did not forget to get protocol from port field. 496 * I just do not know, who uses this weirdness. 497 * IP_HDRINCL is much more convenient. 498 */ 499 } else { 500 err = -EDESTADDRREQ; 501 if (sk->sk_state != TCP_ESTABLISHED) 502 goto out; 503 daddr = inet->inet_daddr; 504 } 505 506 ipc.addr = inet->inet_saddr; 507 ipc.opt = NULL; 508 ipc.shtx.flags = 0; 509 ipc.oif = sk->sk_bound_dev_if; 510 511 if (msg->msg_controllen) { 512 err = ip_cmsg_send(sock_net(sk), msg, &ipc); 513 if (err) 514 goto out; 515 if (ipc.opt) 516 free = 1; 517 } 518 519 saddr = ipc.addr; 520 ipc.addr = daddr; 521 522 if (!ipc.opt) 523 ipc.opt = inet->opt; 524 525 if (ipc.opt) { 526 err = -EINVAL; 527 /* Linux does not mangle headers on raw sockets, 528 * so that IP options + IP_HDRINCL is non-sense. 529 */ 530 if (inet->hdrincl) 531 goto done; 532 if (ipc.opt->srr) { 533 if (!daddr) 534 goto done; 535 daddr = ipc.opt->faddr; 536 } 537 } 538 tos = RT_CONN_FLAGS(sk); 539 if (msg->msg_flags & MSG_DONTROUTE) 540 tos |= RTO_ONLINK; 541 542 if (ipv4_is_multicast(daddr)) { 543 if (!ipc.oif) 544 ipc.oif = inet->mc_index; 545 if (!saddr) 546 saddr = inet->mc_addr; 547 } 548 549 { 550 struct flowi fl = { .oif = ipc.oif, 551 .mark = sk->sk_mark, 552 .nl_u = { .ip4_u = 553 { .daddr = daddr, 554 .saddr = saddr, 555 .tos = tos } }, 556 .proto = inet->hdrincl ? IPPROTO_RAW : 557 sk->sk_protocol, 558 }; 559 if (!inet->hdrincl) { 560 err = raw_probe_proto_opt(&fl, msg); 561 if (err) 562 goto done; 563 } 564 565 security_sk_classify_flow(sk, &fl); 566 err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1); 567 } 568 if (err) 569 goto done; 570 571 err = -EACCES; 572 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 573 goto done; 574 575 if (msg->msg_flags & MSG_CONFIRM) 576 goto do_confirm; 577 back_from_confirm: 578 579 if (inet->hdrincl) 580 err = raw_send_hdrinc(sk, msg->msg_iov, len, 581 &rt, msg->msg_flags); 582 583 else { 584 if (!ipc.addr) 585 ipc.addr = rt->rt_dst; 586 lock_sock(sk); 587 err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0, 588 &ipc, &rt, msg->msg_flags); 589 if (err) 590 ip_flush_pending_frames(sk); 591 else if (!(msg->msg_flags & MSG_MORE)) { 592 err = ip_push_pending_frames(sk); 593 if (err == -ENOBUFS && !inet->recverr) 594 err = 0; 595 } 596 release_sock(sk); 597 } 598 done: 599 if (free) 600 kfree(ipc.opt); 601 ip_rt_put(rt); 602 603 out: 604 if (err < 0) 605 return err; 606 return len; 607 608 do_confirm: 609 dst_confirm(&rt->dst); 610 if (!(msg->msg_flags & MSG_PROBE) || len) 611 goto back_from_confirm; 612 err = 0; 613 goto done; 614 } 615 616 static void raw_close(struct sock *sk, long timeout) 617 { 618 /* 619 * Raw sockets may have direct kernel refereneces. Kill them. 620 */ 621 ip_ra_control(sk, 0, NULL); 622 623 sk_common_release(sk); 624 } 625 626 static void raw_destroy(struct sock *sk) 627 { 628 lock_sock(sk); 629 ip_flush_pending_frames(sk); 630 release_sock(sk); 631 } 632 633 /* This gets rid of all the nasties in af_inet. -DaveM */ 634 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 635 { 636 struct inet_sock *inet = inet_sk(sk); 637 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 638 int ret = -EINVAL; 639 int chk_addr_ret; 640 641 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 642 goto out; 643 chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); 644 ret = -EADDRNOTAVAIL; 645 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 646 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 647 goto out; 648 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 649 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 650 inet->inet_saddr = 0; /* Use device */ 651 sk_dst_reset(sk); 652 ret = 0; 653 out: return ret; 654 } 655 656 /* 657 * This should be easy, if there is something there 658 * we return it, otherwise we block. 659 */ 660 661 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, 662 size_t len, int noblock, int flags, int *addr_len) 663 { 664 struct inet_sock *inet = inet_sk(sk); 665 size_t copied = 0; 666 int err = -EOPNOTSUPP; 667 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; 668 struct sk_buff *skb; 669 670 if (flags & MSG_OOB) 671 goto out; 672 673 if (addr_len) 674 *addr_len = sizeof(*sin); 675 676 if (flags & MSG_ERRQUEUE) { 677 err = ip_recv_error(sk, msg, len); 678 goto out; 679 } 680 681 skb = skb_recv_datagram(sk, flags, noblock, &err); 682 if (!skb) 683 goto out; 684 685 copied = skb->len; 686 if (len < copied) { 687 msg->msg_flags |= MSG_TRUNC; 688 copied = len; 689 } 690 691 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 692 if (err) 693 goto done; 694 695 sock_recv_ts_and_drops(msg, sk, skb); 696 697 /* Copy the address. */ 698 if (sin) { 699 sin->sin_family = AF_INET; 700 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 701 sin->sin_port = 0; 702 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 703 } 704 if (inet->cmsg_flags) 705 ip_cmsg_recv(msg, skb); 706 if (flags & MSG_TRUNC) 707 copied = skb->len; 708 done: 709 skb_free_datagram(sk, skb); 710 out: 711 if (err) 712 return err; 713 return copied; 714 } 715 716 static int raw_init(struct sock *sk) 717 { 718 struct raw_sock *rp = raw_sk(sk); 719 720 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 721 memset(&rp->filter, 0, sizeof(rp->filter)); 722 return 0; 723 } 724 725 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 726 { 727 if (optlen > sizeof(struct icmp_filter)) 728 optlen = sizeof(struct icmp_filter); 729 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 730 return -EFAULT; 731 return 0; 732 } 733 734 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 735 { 736 int len, ret = -EFAULT; 737 738 if (get_user(len, optlen)) 739 goto out; 740 ret = -EINVAL; 741 if (len < 0) 742 goto out; 743 if (len > sizeof(struct icmp_filter)) 744 len = sizeof(struct icmp_filter); 745 ret = -EFAULT; 746 if (put_user(len, optlen) || 747 copy_to_user(optval, &raw_sk(sk)->filter, len)) 748 goto out; 749 ret = 0; 750 out: return ret; 751 } 752 753 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 754 char __user *optval, unsigned int optlen) 755 { 756 if (optname == ICMP_FILTER) { 757 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 758 return -EOPNOTSUPP; 759 else 760 return raw_seticmpfilter(sk, optval, optlen); 761 } 762 return -ENOPROTOOPT; 763 } 764 765 static int raw_setsockopt(struct sock *sk, int level, int optname, 766 char __user *optval, unsigned int optlen) 767 { 768 if (level != SOL_RAW) 769 return ip_setsockopt(sk, level, optname, optval, optlen); 770 return do_raw_setsockopt(sk, level, optname, optval, optlen); 771 } 772 773 #ifdef CONFIG_COMPAT 774 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 775 char __user *optval, unsigned int optlen) 776 { 777 if (level != SOL_RAW) 778 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 779 return do_raw_setsockopt(sk, level, optname, optval, optlen); 780 } 781 #endif 782 783 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 784 char __user *optval, int __user *optlen) 785 { 786 if (optname == ICMP_FILTER) { 787 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 788 return -EOPNOTSUPP; 789 else 790 return raw_geticmpfilter(sk, optval, optlen); 791 } 792 return -ENOPROTOOPT; 793 } 794 795 static int raw_getsockopt(struct sock *sk, int level, int optname, 796 char __user *optval, int __user *optlen) 797 { 798 if (level != SOL_RAW) 799 return ip_getsockopt(sk, level, optname, optval, optlen); 800 return do_raw_getsockopt(sk, level, optname, optval, optlen); 801 } 802 803 #ifdef CONFIG_COMPAT 804 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 805 char __user *optval, int __user *optlen) 806 { 807 if (level != SOL_RAW) 808 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 809 return do_raw_getsockopt(sk, level, optname, optval, optlen); 810 } 811 #endif 812 813 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 814 { 815 switch (cmd) { 816 case SIOCOUTQ: { 817 int amount = sk_wmem_alloc_get(sk); 818 819 return put_user(amount, (int __user *)arg); 820 } 821 case SIOCINQ: { 822 struct sk_buff *skb; 823 int amount = 0; 824 825 spin_lock_bh(&sk->sk_receive_queue.lock); 826 skb = skb_peek(&sk->sk_receive_queue); 827 if (skb != NULL) 828 amount = skb->len; 829 spin_unlock_bh(&sk->sk_receive_queue.lock); 830 return put_user(amount, (int __user *)arg); 831 } 832 833 default: 834 #ifdef CONFIG_IP_MROUTE 835 return ipmr_ioctl(sk, cmd, (void __user *)arg); 836 #else 837 return -ENOIOCTLCMD; 838 #endif 839 } 840 } 841 842 struct proto raw_prot = { 843 .name = "RAW", 844 .owner = THIS_MODULE, 845 .close = raw_close, 846 .destroy = raw_destroy, 847 .connect = ip4_datagram_connect, 848 .disconnect = udp_disconnect, 849 .ioctl = raw_ioctl, 850 .init = raw_init, 851 .setsockopt = raw_setsockopt, 852 .getsockopt = raw_getsockopt, 853 .sendmsg = raw_sendmsg, 854 .recvmsg = raw_recvmsg, 855 .bind = raw_bind, 856 .backlog_rcv = raw_rcv_skb, 857 .hash = raw_hash_sk, 858 .unhash = raw_unhash_sk, 859 .obj_size = sizeof(struct raw_sock), 860 .h.raw_hash = &raw_v4_hashinfo, 861 #ifdef CONFIG_COMPAT 862 .compat_setsockopt = compat_raw_setsockopt, 863 .compat_getsockopt = compat_raw_getsockopt, 864 #endif 865 }; 866 867 #ifdef CONFIG_PROC_FS 868 static struct sock *raw_get_first(struct seq_file *seq) 869 { 870 struct sock *sk; 871 struct raw_iter_state *state = raw_seq_private(seq); 872 873 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 874 ++state->bucket) { 875 struct hlist_node *node; 876 877 sk_for_each(sk, node, &state->h->ht[state->bucket]) 878 if (sock_net(sk) == seq_file_net(seq)) 879 goto found; 880 } 881 sk = NULL; 882 found: 883 return sk; 884 } 885 886 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 887 { 888 struct raw_iter_state *state = raw_seq_private(seq); 889 890 do { 891 sk = sk_next(sk); 892 try_again: 893 ; 894 } while (sk && sock_net(sk) != seq_file_net(seq)); 895 896 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 897 sk = sk_head(&state->h->ht[state->bucket]); 898 goto try_again; 899 } 900 return sk; 901 } 902 903 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 904 { 905 struct sock *sk = raw_get_first(seq); 906 907 if (sk) 908 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 909 --pos; 910 return pos ? NULL : sk; 911 } 912 913 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 914 { 915 struct raw_iter_state *state = raw_seq_private(seq); 916 917 read_lock(&state->h->lock); 918 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 919 } 920 EXPORT_SYMBOL_GPL(raw_seq_start); 921 922 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 923 { 924 struct sock *sk; 925 926 if (v == SEQ_START_TOKEN) 927 sk = raw_get_first(seq); 928 else 929 sk = raw_get_next(seq, v); 930 ++*pos; 931 return sk; 932 } 933 EXPORT_SYMBOL_GPL(raw_seq_next); 934 935 void raw_seq_stop(struct seq_file *seq, void *v) 936 { 937 struct raw_iter_state *state = raw_seq_private(seq); 938 939 read_unlock(&state->h->lock); 940 } 941 EXPORT_SYMBOL_GPL(raw_seq_stop); 942 943 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 944 { 945 struct inet_sock *inet = inet_sk(sp); 946 __be32 dest = inet->inet_daddr, 947 src = inet->inet_rcv_saddr; 948 __u16 destp = 0, 949 srcp = inet->inet_num; 950 951 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 952 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", 953 i, src, srcp, dest, destp, sp->sk_state, 954 sk_wmem_alloc_get(sp), 955 sk_rmem_alloc_get(sp), 956 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), 957 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 958 } 959 960 static int raw_seq_show(struct seq_file *seq, void *v) 961 { 962 if (v == SEQ_START_TOKEN) 963 seq_printf(seq, " sl local_address rem_address st tx_queue " 964 "rx_queue tr tm->when retrnsmt uid timeout " 965 "inode ref pointer drops\n"); 966 else 967 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 968 return 0; 969 } 970 971 static const struct seq_operations raw_seq_ops = { 972 .start = raw_seq_start, 973 .next = raw_seq_next, 974 .stop = raw_seq_stop, 975 .show = raw_seq_show, 976 }; 977 978 int raw_seq_open(struct inode *ino, struct file *file, 979 struct raw_hashinfo *h, const struct seq_operations *ops) 980 { 981 int err; 982 struct raw_iter_state *i; 983 984 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 985 if (err < 0) 986 return err; 987 988 i = raw_seq_private((struct seq_file *)file->private_data); 989 i->h = h; 990 return 0; 991 } 992 EXPORT_SYMBOL_GPL(raw_seq_open); 993 994 static int raw_v4_seq_open(struct inode *inode, struct file *file) 995 { 996 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 997 } 998 999 static const struct file_operations raw_seq_fops = { 1000 .owner = THIS_MODULE, 1001 .open = raw_v4_seq_open, 1002 .read = seq_read, 1003 .llseek = seq_lseek, 1004 .release = seq_release_net, 1005 }; 1006 1007 static __net_init int raw_init_net(struct net *net) 1008 { 1009 if (!proc_net_fops_create(net, "raw", S_IRUGO, &raw_seq_fops)) 1010 return -ENOMEM; 1011 1012 return 0; 1013 } 1014 1015 static __net_exit void raw_exit_net(struct net *net) 1016 { 1017 proc_net_remove(net, "raw"); 1018 } 1019 1020 static __net_initdata struct pernet_operations raw_net_ops = { 1021 .init = raw_init_net, 1022 .exit = raw_exit_net, 1023 }; 1024 1025 int __init raw_proc_init(void) 1026 { 1027 return register_pernet_subsys(&raw_net_ops); 1028 } 1029 1030 void __init raw_proc_exit(void) 1031 { 1032 unregister_pernet_subsys(&raw_net_ops); 1033 } 1034 #endif /* CONFIG_PROC_FS */ 1035