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