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 <linux/atomic.h> 42 #include <asm/byteorder.h> 43 #include <asm/current.h> 44 #include <linux/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/kernel.h> 50 #include <linux/export.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 <linux/igmp.h> 61 #include <net/net_namespace.h> 62 #include <net/dst.h> 63 #include <net/sock.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 #include <linux/compat.h> 81 #include <linux/uio.h> 82 83 struct raw_frag_vec { 84 struct msghdr *msg; 85 union { 86 struct icmphdr icmph; 87 char c[1]; 88 } hdr; 89 int hlen; 90 }; 91 92 struct raw_hashinfo raw_v4_hashinfo = { 93 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 94 }; 95 EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 96 97 int raw_hash_sk(struct sock *sk) 98 { 99 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 100 struct hlist_head *head; 101 102 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 103 104 write_lock_bh(&h->lock); 105 sk_add_node(sk, head); 106 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 107 write_unlock_bh(&h->lock); 108 109 return 0; 110 } 111 EXPORT_SYMBOL_GPL(raw_hash_sk); 112 113 void raw_unhash_sk(struct sock *sk) 114 { 115 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 116 117 write_lock_bh(&h->lock); 118 if (sk_del_node_init(sk)) 119 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 120 write_unlock_bh(&h->lock); 121 } 122 EXPORT_SYMBOL_GPL(raw_unhash_sk); 123 124 struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, 125 unsigned short num, __be32 raddr, __be32 laddr, 126 int dif, int sdif) 127 { 128 sk_for_each_from(sk) { 129 struct inet_sock *inet = inet_sk(sk); 130 131 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 132 !(inet->inet_daddr && inet->inet_daddr != raddr) && 133 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 134 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif && 135 sk->sk_bound_dev_if != sdif)) 136 goto found; /* gotcha */ 137 } 138 sk = NULL; 139 found: 140 return sk; 141 } 142 EXPORT_SYMBOL_GPL(__raw_v4_lookup); 143 144 /* 145 * 0 - deliver 146 * 1 - block 147 */ 148 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) 149 { 150 struct icmphdr _hdr; 151 const struct icmphdr *hdr; 152 153 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 154 sizeof(_hdr), &_hdr); 155 if (!hdr) 156 return 1; 157 158 if (hdr->type < 32) { 159 __u32 data = raw_sk(sk)->filter.data; 160 161 return ((1U << hdr->type) & data) != 0; 162 } 163 164 /* Do not block unknown ICMP types */ 165 return 0; 166 } 167 168 /* IP input processing comes here for RAW socket delivery. 169 * Caller owns SKB, so we must make clones. 170 * 171 * RFC 1122: SHOULD pass TOS value up to the transport layer. 172 * -> It does. And not only TOS, but all IP header. 173 */ 174 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash) 175 { 176 int sdif = inet_sdif(skb); 177 struct sock *sk; 178 struct hlist_head *head; 179 int delivered = 0; 180 struct net *net; 181 182 read_lock(&raw_v4_hashinfo.lock); 183 head = &raw_v4_hashinfo.ht[hash]; 184 if (hlist_empty(head)) 185 goto out; 186 187 net = dev_net(skb->dev); 188 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, 189 iph->saddr, iph->daddr, 190 skb->dev->ifindex, sdif); 191 192 while (sk) { 193 delivered = 1; 194 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && 195 ip_mc_sf_allow(sk, iph->daddr, iph->saddr, 196 skb->dev->ifindex, sdif)) { 197 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 198 199 /* Not releasing hash table! */ 200 if (clone) 201 raw_rcv(sk, clone); 202 } 203 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, 204 iph->saddr, iph->daddr, 205 skb->dev->ifindex, sdif); 206 } 207 out: 208 read_unlock(&raw_v4_hashinfo.lock); 209 return delivered; 210 } 211 212 int raw_local_deliver(struct sk_buff *skb, int protocol) 213 { 214 int hash; 215 struct sock *raw_sk; 216 217 hash = protocol & (RAW_HTABLE_SIZE - 1); 218 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 219 220 /* If there maybe a raw socket we must check - if not we 221 * don't care less 222 */ 223 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) 224 raw_sk = NULL; 225 226 return raw_sk != NULL; 227 228 } 229 230 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 231 { 232 struct inet_sock *inet = inet_sk(sk); 233 const int type = icmp_hdr(skb)->type; 234 const int code = icmp_hdr(skb)->code; 235 int err = 0; 236 int harderr = 0; 237 238 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 239 ipv4_sk_update_pmtu(skb, sk, info); 240 else if (type == ICMP_REDIRECT) { 241 ipv4_sk_redirect(skb, sk); 242 return; 243 } 244 245 /* Report error on raw socket, if: 246 1. User requested ip_recverr. 247 2. Socket is connected (otherwise the error indication 248 is useless without ip_recverr and error is hard. 249 */ 250 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 251 return; 252 253 switch (type) { 254 default: 255 case ICMP_TIME_EXCEEDED: 256 err = EHOSTUNREACH; 257 break; 258 case ICMP_SOURCE_QUENCH: 259 return; 260 case ICMP_PARAMETERPROB: 261 err = EPROTO; 262 harderr = 1; 263 break; 264 case ICMP_DEST_UNREACH: 265 err = EHOSTUNREACH; 266 if (code > NR_ICMP_UNREACH) 267 break; 268 err = icmp_err_convert[code].errno; 269 harderr = icmp_err_convert[code].fatal; 270 if (code == ICMP_FRAG_NEEDED) { 271 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 272 err = EMSGSIZE; 273 } 274 } 275 276 if (inet->recverr) { 277 const struct iphdr *iph = (const struct iphdr *)skb->data; 278 u8 *payload = skb->data + (iph->ihl << 2); 279 280 if (inet->hdrincl) 281 payload = skb->data; 282 ip_icmp_error(sk, skb, err, 0, info, payload); 283 } 284 285 if (inet->recverr || harderr) { 286 sk->sk_err = err; 287 sk->sk_error_report(sk); 288 } 289 } 290 291 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 292 { 293 int hash; 294 struct sock *raw_sk; 295 const struct iphdr *iph; 296 struct net *net; 297 298 hash = protocol & (RAW_HTABLE_SIZE - 1); 299 300 read_lock(&raw_v4_hashinfo.lock); 301 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 302 if (raw_sk) { 303 int dif = skb->dev->ifindex; 304 int sdif = inet_sdif(skb); 305 306 iph = (const struct iphdr *)skb->data; 307 net = dev_net(skb->dev); 308 309 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 310 iph->daddr, iph->saddr, 311 dif, sdif)) != NULL) { 312 raw_err(raw_sk, skb, info); 313 raw_sk = sk_next(raw_sk); 314 iph = (const struct iphdr *)skb->data; 315 } 316 } 317 read_unlock(&raw_v4_hashinfo.lock); 318 } 319 320 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 321 { 322 /* Charge it to the socket. */ 323 324 ipv4_pktinfo_prepare(sk, skb); 325 if (sock_queue_rcv_skb(sk, skb) < 0) { 326 kfree_skb(skb); 327 return NET_RX_DROP; 328 } 329 330 return NET_RX_SUCCESS; 331 } 332 333 int raw_rcv(struct sock *sk, struct sk_buff *skb) 334 { 335 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 336 atomic_inc(&sk->sk_drops); 337 kfree_skb(skb); 338 return NET_RX_DROP; 339 } 340 nf_reset(skb); 341 342 skb_push(skb, skb->data - skb_network_header(skb)); 343 344 raw_rcv_skb(sk, skb); 345 return 0; 346 } 347 348 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 349 struct msghdr *msg, size_t length, 350 struct rtable **rtp, unsigned int flags, 351 const struct sockcm_cookie *sockc) 352 { 353 struct inet_sock *inet = inet_sk(sk); 354 struct net *net = sock_net(sk); 355 struct iphdr *iph; 356 struct sk_buff *skb; 357 unsigned int iphlen; 358 int err; 359 struct rtable *rt = *rtp; 360 int hlen, tlen; 361 362 if (length > rt->dst.dev->mtu) { 363 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 364 rt->dst.dev->mtu); 365 return -EMSGSIZE; 366 } 367 if (length < sizeof(struct iphdr)) 368 return -EINVAL; 369 370 if (flags&MSG_PROBE) 371 goto out; 372 373 hlen = LL_RESERVED_SPACE(rt->dst.dev); 374 tlen = rt->dst.dev->needed_tailroom; 375 skb = sock_alloc_send_skb(sk, 376 length + hlen + tlen + 15, 377 flags & MSG_DONTWAIT, &err); 378 if (!skb) 379 goto error; 380 skb_reserve(skb, hlen); 381 382 skb->priority = sk->sk_priority; 383 skb->mark = sk->sk_mark; 384 skb_dst_set(skb, &rt->dst); 385 *rtp = NULL; 386 387 skb_reset_network_header(skb); 388 iph = ip_hdr(skb); 389 skb_put(skb, length); 390 391 skb->ip_summed = CHECKSUM_NONE; 392 393 sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags); 394 395 if (flags & MSG_CONFIRM) 396 skb_set_dst_pending_confirm(skb, 1); 397 398 skb->transport_header = skb->network_header; 399 err = -EFAULT; 400 if (memcpy_from_msg(iph, msg, length)) 401 goto error_free; 402 403 iphlen = iph->ihl * 4; 404 405 /* 406 * We don't want to modify the ip header, but we do need to 407 * be sure that it won't cause problems later along the network 408 * stack. Specifically we want to make sure that iph->ihl is a 409 * sane value. If ihl points beyond the length of the buffer passed 410 * in, reject the frame as invalid 411 */ 412 err = -EINVAL; 413 if (iphlen > length) 414 goto error_free; 415 416 if (iphlen >= sizeof(*iph)) { 417 if (!iph->saddr) 418 iph->saddr = fl4->saddr; 419 iph->check = 0; 420 iph->tot_len = htons(length); 421 if (!iph->id) 422 ip_select_ident(net, skb, NULL); 423 424 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 425 skb->transport_header += iphlen; 426 if (iph->protocol == IPPROTO_ICMP && 427 length >= iphlen + sizeof(struct icmphdr)) 428 icmp_out_count(net, ((struct icmphdr *) 429 skb_transport_header(skb))->type); 430 } 431 432 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 433 net, sk, skb, NULL, rt->dst.dev, 434 dst_output); 435 if (err > 0) 436 err = net_xmit_errno(err); 437 if (err) 438 goto error; 439 out: 440 return 0; 441 442 error_free: 443 kfree_skb(skb); 444 error: 445 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 446 if (err == -ENOBUFS && !inet->recverr) 447 err = 0; 448 return err; 449 } 450 451 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 452 { 453 int err; 454 455 if (fl4->flowi4_proto != IPPROTO_ICMP) 456 return 0; 457 458 /* We only need the first two bytes. */ 459 rfv->hlen = 2; 460 461 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 462 if (err) 463 return err; 464 465 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 466 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 467 468 return 0; 469 } 470 471 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 472 struct sk_buff *skb) 473 { 474 struct raw_frag_vec *rfv = from; 475 476 if (offset < rfv->hlen) { 477 int copy = min(rfv->hlen - offset, len); 478 479 if (skb->ip_summed == CHECKSUM_PARTIAL) 480 memcpy(to, rfv->hdr.c + offset, copy); 481 else 482 skb->csum = csum_block_add( 483 skb->csum, 484 csum_partial_copy_nocheck(rfv->hdr.c + offset, 485 to, copy, 0), 486 odd); 487 488 odd = 0; 489 offset += copy; 490 to += copy; 491 len -= copy; 492 493 if (!len) 494 return 0; 495 } 496 497 offset -= rfv->hlen; 498 499 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 500 } 501 502 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 503 { 504 struct inet_sock *inet = inet_sk(sk); 505 struct net *net = sock_net(sk); 506 struct ipcm_cookie ipc; 507 struct rtable *rt = NULL; 508 struct flowi4 fl4; 509 int free = 0; 510 __be32 daddr; 511 __be32 saddr; 512 u8 tos; 513 int err; 514 struct ip_options_data opt_copy; 515 struct raw_frag_vec rfv; 516 int hdrincl; 517 518 err = -EMSGSIZE; 519 if (len > 0xFFFF) 520 goto out; 521 522 /* hdrincl should be READ_ONCE(inet->hdrincl) 523 * but READ_ONCE() doesn't work with bit fields. 524 * Doing this indirectly yields the same result. 525 */ 526 hdrincl = inet->hdrincl; 527 hdrincl = READ_ONCE(hdrincl); 528 /* 529 * Check the flags. 530 */ 531 532 err = -EOPNOTSUPP; 533 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 534 goto out; /* compatibility */ 535 536 /* 537 * Get and verify the address. 538 */ 539 540 if (msg->msg_namelen) { 541 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 542 err = -EINVAL; 543 if (msg->msg_namelen < sizeof(*usin)) 544 goto out; 545 if (usin->sin_family != AF_INET) { 546 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 547 __func__, current->comm); 548 err = -EAFNOSUPPORT; 549 if (usin->sin_family) 550 goto out; 551 } 552 daddr = usin->sin_addr.s_addr; 553 /* ANK: I did not forget to get protocol from port field. 554 * I just do not know, who uses this weirdness. 555 * IP_HDRINCL is much more convenient. 556 */ 557 } else { 558 err = -EDESTADDRREQ; 559 if (sk->sk_state != TCP_ESTABLISHED) 560 goto out; 561 daddr = inet->inet_daddr; 562 } 563 564 ipc.sockc.tsflags = sk->sk_tsflags; 565 ipc.addr = inet->inet_saddr; 566 ipc.opt = NULL; 567 ipc.tx_flags = 0; 568 ipc.ttl = 0; 569 ipc.tos = -1; 570 ipc.oif = sk->sk_bound_dev_if; 571 572 if (msg->msg_controllen) { 573 err = ip_cmsg_send(sk, msg, &ipc, false); 574 if (unlikely(err)) { 575 kfree(ipc.opt); 576 goto out; 577 } 578 if (ipc.opt) 579 free = 1; 580 } 581 582 saddr = ipc.addr; 583 ipc.addr = daddr; 584 585 if (!ipc.opt) { 586 struct ip_options_rcu *inet_opt; 587 588 rcu_read_lock(); 589 inet_opt = rcu_dereference(inet->inet_opt); 590 if (inet_opt) { 591 memcpy(&opt_copy, inet_opt, 592 sizeof(*inet_opt) + inet_opt->opt.optlen); 593 ipc.opt = &opt_copy.opt; 594 } 595 rcu_read_unlock(); 596 } 597 598 if (ipc.opt) { 599 err = -EINVAL; 600 /* Linux does not mangle headers on raw sockets, 601 * so that IP options + IP_HDRINCL is non-sense. 602 */ 603 if (hdrincl) 604 goto done; 605 if (ipc.opt->opt.srr) { 606 if (!daddr) 607 goto done; 608 daddr = ipc.opt->opt.faddr; 609 } 610 } 611 tos = get_rtconn_flags(&ipc, sk); 612 if (msg->msg_flags & MSG_DONTROUTE) 613 tos |= RTO_ONLINK; 614 615 if (ipv4_is_multicast(daddr)) { 616 if (!ipc.oif) 617 ipc.oif = inet->mc_index; 618 if (!saddr) 619 saddr = inet->mc_addr; 620 } else if (!ipc.oif) { 621 ipc.oif = inet->uc_index; 622 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 623 /* oif is set, packet is to local broadcast and 624 * and uc_index is set. oif is most likely set 625 * by sk_bound_dev_if. If uc_index != oif check if the 626 * oif is an L3 master and uc_index is an L3 slave. 627 * If so, we want to allow the send using the uc_index. 628 */ 629 if (ipc.oif != inet->uc_index && 630 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 631 inet->uc_index)) { 632 ipc.oif = inet->uc_index; 633 } 634 } 635 636 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, 637 RT_SCOPE_UNIVERSE, 638 hdrincl ? IPPROTO_RAW : sk->sk_protocol, 639 inet_sk_flowi_flags(sk) | 640 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 641 daddr, saddr, 0, 0, sk->sk_uid); 642 643 if (!hdrincl) { 644 rfv.msg = msg; 645 rfv.hlen = 0; 646 647 err = raw_probe_proto_opt(&rfv, &fl4); 648 if (err) 649 goto done; 650 } 651 652 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); 653 rt = ip_route_output_flow(net, &fl4, sk); 654 if (IS_ERR(rt)) { 655 err = PTR_ERR(rt); 656 rt = NULL; 657 goto done; 658 } 659 660 err = -EACCES; 661 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 662 goto done; 663 664 if (msg->msg_flags & MSG_CONFIRM) 665 goto do_confirm; 666 back_from_confirm: 667 668 if (hdrincl) 669 err = raw_send_hdrinc(sk, &fl4, msg, len, 670 &rt, msg->msg_flags, &ipc.sockc); 671 672 else { 673 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); 674 675 if (!ipc.addr) 676 ipc.addr = fl4.daddr; 677 lock_sock(sk); 678 err = ip_append_data(sk, &fl4, raw_getfrag, 679 &rfv, len, 0, 680 &ipc, &rt, msg->msg_flags); 681 if (err) 682 ip_flush_pending_frames(sk); 683 else if (!(msg->msg_flags & MSG_MORE)) { 684 err = ip_push_pending_frames(sk, &fl4); 685 if (err == -ENOBUFS && !inet->recverr) 686 err = 0; 687 } 688 release_sock(sk); 689 } 690 done: 691 if (free) 692 kfree(ipc.opt); 693 ip_rt_put(rt); 694 695 out: 696 if (err < 0) 697 return err; 698 return len; 699 700 do_confirm: 701 if (msg->msg_flags & MSG_PROBE) 702 dst_confirm_neigh(&rt->dst, &fl4.daddr); 703 if (!(msg->msg_flags & MSG_PROBE) || len) 704 goto back_from_confirm; 705 err = 0; 706 goto done; 707 } 708 709 static void raw_close(struct sock *sk, long timeout) 710 { 711 /* 712 * Raw sockets may have direct kernel references. Kill them. 713 */ 714 ip_ra_control(sk, 0, NULL); 715 716 sk_common_release(sk); 717 } 718 719 static void raw_destroy(struct sock *sk) 720 { 721 lock_sock(sk); 722 ip_flush_pending_frames(sk); 723 release_sock(sk); 724 } 725 726 /* This gets rid of all the nasties in af_inet. -DaveM */ 727 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 728 { 729 struct inet_sock *inet = inet_sk(sk); 730 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 731 u32 tb_id = RT_TABLE_LOCAL; 732 int ret = -EINVAL; 733 int chk_addr_ret; 734 735 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 736 goto out; 737 738 if (sk->sk_bound_dev_if) 739 tb_id = l3mdev_fib_table_by_index(sock_net(sk), 740 sk->sk_bound_dev_if) ? : tb_id; 741 742 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 743 tb_id); 744 745 ret = -EADDRNOTAVAIL; 746 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 747 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 748 goto out; 749 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 750 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 751 inet->inet_saddr = 0; /* Use device */ 752 sk_dst_reset(sk); 753 ret = 0; 754 out: return ret; 755 } 756 757 /* 758 * This should be easy, if there is something there 759 * we return it, otherwise we block. 760 */ 761 762 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 763 int noblock, int flags, int *addr_len) 764 { 765 struct inet_sock *inet = inet_sk(sk); 766 size_t copied = 0; 767 int err = -EOPNOTSUPP; 768 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 769 struct sk_buff *skb; 770 771 if (flags & MSG_OOB) 772 goto out; 773 774 if (flags & MSG_ERRQUEUE) { 775 err = ip_recv_error(sk, msg, len, addr_len); 776 goto out; 777 } 778 779 skb = skb_recv_datagram(sk, flags, noblock, &err); 780 if (!skb) 781 goto out; 782 783 copied = skb->len; 784 if (len < copied) { 785 msg->msg_flags |= MSG_TRUNC; 786 copied = len; 787 } 788 789 err = skb_copy_datagram_msg(skb, 0, msg, copied); 790 if (err) 791 goto done; 792 793 sock_recv_ts_and_drops(msg, sk, skb); 794 795 /* Copy the address. */ 796 if (sin) { 797 sin->sin_family = AF_INET; 798 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 799 sin->sin_port = 0; 800 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 801 *addr_len = sizeof(*sin); 802 } 803 if (inet->cmsg_flags) 804 ip_cmsg_recv(msg, skb); 805 if (flags & MSG_TRUNC) 806 copied = skb->len; 807 done: 808 skb_free_datagram(sk, skb); 809 out: 810 if (err) 811 return err; 812 return copied; 813 } 814 815 static int raw_init(struct sock *sk) 816 { 817 struct raw_sock *rp = raw_sk(sk); 818 819 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 820 memset(&rp->filter, 0, sizeof(rp->filter)); 821 return 0; 822 } 823 824 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 825 { 826 if (optlen > sizeof(struct icmp_filter)) 827 optlen = sizeof(struct icmp_filter); 828 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 829 return -EFAULT; 830 return 0; 831 } 832 833 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 834 { 835 int len, ret = -EFAULT; 836 837 if (get_user(len, optlen)) 838 goto out; 839 ret = -EINVAL; 840 if (len < 0) 841 goto out; 842 if (len > sizeof(struct icmp_filter)) 843 len = sizeof(struct icmp_filter); 844 ret = -EFAULT; 845 if (put_user(len, optlen) || 846 copy_to_user(optval, &raw_sk(sk)->filter, len)) 847 goto out; 848 ret = 0; 849 out: return ret; 850 } 851 852 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 853 char __user *optval, unsigned int optlen) 854 { 855 if (optname == ICMP_FILTER) { 856 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 857 return -EOPNOTSUPP; 858 else 859 return raw_seticmpfilter(sk, optval, optlen); 860 } 861 return -ENOPROTOOPT; 862 } 863 864 static int raw_setsockopt(struct sock *sk, int level, int optname, 865 char __user *optval, unsigned int optlen) 866 { 867 if (level != SOL_RAW) 868 return ip_setsockopt(sk, level, optname, optval, optlen); 869 return do_raw_setsockopt(sk, level, optname, optval, optlen); 870 } 871 872 #ifdef CONFIG_COMPAT 873 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 874 char __user *optval, unsigned int optlen) 875 { 876 if (level != SOL_RAW) 877 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 878 return do_raw_setsockopt(sk, level, optname, optval, optlen); 879 } 880 #endif 881 882 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 883 char __user *optval, int __user *optlen) 884 { 885 if (optname == ICMP_FILTER) { 886 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 887 return -EOPNOTSUPP; 888 else 889 return raw_geticmpfilter(sk, optval, optlen); 890 } 891 return -ENOPROTOOPT; 892 } 893 894 static int raw_getsockopt(struct sock *sk, int level, int optname, 895 char __user *optval, int __user *optlen) 896 { 897 if (level != SOL_RAW) 898 return ip_getsockopt(sk, level, optname, optval, optlen); 899 return do_raw_getsockopt(sk, level, optname, optval, optlen); 900 } 901 902 #ifdef CONFIG_COMPAT 903 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 904 char __user *optval, int __user *optlen) 905 { 906 if (level != SOL_RAW) 907 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 908 return do_raw_getsockopt(sk, level, optname, optval, optlen); 909 } 910 #endif 911 912 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 913 { 914 switch (cmd) { 915 case SIOCOUTQ: { 916 int amount = sk_wmem_alloc_get(sk); 917 918 return put_user(amount, (int __user *)arg); 919 } 920 case SIOCINQ: { 921 struct sk_buff *skb; 922 int amount = 0; 923 924 spin_lock_bh(&sk->sk_receive_queue.lock); 925 skb = skb_peek(&sk->sk_receive_queue); 926 if (skb) 927 amount = skb->len; 928 spin_unlock_bh(&sk->sk_receive_queue.lock); 929 return put_user(amount, (int __user *)arg); 930 } 931 932 default: 933 #ifdef CONFIG_IP_MROUTE 934 return ipmr_ioctl(sk, cmd, (void __user *)arg); 935 #else 936 return -ENOIOCTLCMD; 937 #endif 938 } 939 } 940 941 #ifdef CONFIG_COMPAT 942 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 943 { 944 switch (cmd) { 945 case SIOCOUTQ: 946 case SIOCINQ: 947 return -ENOIOCTLCMD; 948 default: 949 #ifdef CONFIG_IP_MROUTE 950 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 951 #else 952 return -ENOIOCTLCMD; 953 #endif 954 } 955 } 956 #endif 957 958 int raw_abort(struct sock *sk, int err) 959 { 960 lock_sock(sk); 961 962 sk->sk_err = err; 963 sk->sk_error_report(sk); 964 __udp_disconnect(sk, 0); 965 966 release_sock(sk); 967 968 return 0; 969 } 970 EXPORT_SYMBOL_GPL(raw_abort); 971 972 struct proto raw_prot = { 973 .name = "RAW", 974 .owner = THIS_MODULE, 975 .close = raw_close, 976 .destroy = raw_destroy, 977 .connect = ip4_datagram_connect, 978 .disconnect = __udp_disconnect, 979 .ioctl = raw_ioctl, 980 .init = raw_init, 981 .setsockopt = raw_setsockopt, 982 .getsockopt = raw_getsockopt, 983 .sendmsg = raw_sendmsg, 984 .recvmsg = raw_recvmsg, 985 .bind = raw_bind, 986 .backlog_rcv = raw_rcv_skb, 987 .release_cb = ip4_datagram_release_cb, 988 .hash = raw_hash_sk, 989 .unhash = raw_unhash_sk, 990 .obj_size = sizeof(struct raw_sock), 991 .useroffset = offsetof(struct raw_sock, filter), 992 .usersize = sizeof_field(struct raw_sock, filter), 993 .h.raw_hash = &raw_v4_hashinfo, 994 #ifdef CONFIG_COMPAT 995 .compat_setsockopt = compat_raw_setsockopt, 996 .compat_getsockopt = compat_raw_getsockopt, 997 .compat_ioctl = compat_raw_ioctl, 998 #endif 999 .diag_destroy = raw_abort, 1000 }; 1001 1002 #ifdef CONFIG_PROC_FS 1003 static struct sock *raw_get_first(struct seq_file *seq) 1004 { 1005 struct sock *sk; 1006 struct raw_iter_state *state = raw_seq_private(seq); 1007 1008 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 1009 ++state->bucket) { 1010 sk_for_each(sk, &state->h->ht[state->bucket]) 1011 if (sock_net(sk) == seq_file_net(seq)) 1012 goto found; 1013 } 1014 sk = NULL; 1015 found: 1016 return sk; 1017 } 1018 1019 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 1020 { 1021 struct raw_iter_state *state = raw_seq_private(seq); 1022 1023 do { 1024 sk = sk_next(sk); 1025 try_again: 1026 ; 1027 } while (sk && sock_net(sk) != seq_file_net(seq)); 1028 1029 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 1030 sk = sk_head(&state->h->ht[state->bucket]); 1031 goto try_again; 1032 } 1033 return sk; 1034 } 1035 1036 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1037 { 1038 struct sock *sk = raw_get_first(seq); 1039 1040 if (sk) 1041 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1042 --pos; 1043 return pos ? NULL : sk; 1044 } 1045 1046 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1047 { 1048 struct raw_iter_state *state = raw_seq_private(seq); 1049 1050 read_lock(&state->h->lock); 1051 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1052 } 1053 EXPORT_SYMBOL_GPL(raw_seq_start); 1054 1055 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1056 { 1057 struct sock *sk; 1058 1059 if (v == SEQ_START_TOKEN) 1060 sk = raw_get_first(seq); 1061 else 1062 sk = raw_get_next(seq, v); 1063 ++*pos; 1064 return sk; 1065 } 1066 EXPORT_SYMBOL_GPL(raw_seq_next); 1067 1068 void raw_seq_stop(struct seq_file *seq, void *v) 1069 { 1070 struct raw_iter_state *state = raw_seq_private(seq); 1071 1072 read_unlock(&state->h->lock); 1073 } 1074 EXPORT_SYMBOL_GPL(raw_seq_stop); 1075 1076 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1077 { 1078 struct inet_sock *inet = inet_sk(sp); 1079 __be32 dest = inet->inet_daddr, 1080 src = inet->inet_rcv_saddr; 1081 __u16 destp = 0, 1082 srcp = inet->inet_num; 1083 1084 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1085 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1086 i, src, srcp, dest, destp, sp->sk_state, 1087 sk_wmem_alloc_get(sp), 1088 sk_rmem_alloc_get(sp), 1089 0, 0L, 0, 1090 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1091 0, sock_i_ino(sp), 1092 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1093 } 1094 1095 static int raw_seq_show(struct seq_file *seq, void *v) 1096 { 1097 if (v == SEQ_START_TOKEN) 1098 seq_printf(seq, " sl local_address rem_address st tx_queue " 1099 "rx_queue tr tm->when retrnsmt uid timeout " 1100 "inode ref pointer drops\n"); 1101 else 1102 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1103 return 0; 1104 } 1105 1106 static const struct seq_operations raw_seq_ops = { 1107 .start = raw_seq_start, 1108 .next = raw_seq_next, 1109 .stop = raw_seq_stop, 1110 .show = raw_seq_show, 1111 }; 1112 1113 int raw_seq_open(struct inode *ino, struct file *file, 1114 struct raw_hashinfo *h, const struct seq_operations *ops) 1115 { 1116 int err; 1117 struct raw_iter_state *i; 1118 1119 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 1120 if (err < 0) 1121 return err; 1122 1123 i = raw_seq_private((struct seq_file *)file->private_data); 1124 i->h = h; 1125 return 0; 1126 } 1127 EXPORT_SYMBOL_GPL(raw_seq_open); 1128 1129 static int raw_v4_seq_open(struct inode *inode, struct file *file) 1130 { 1131 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 1132 } 1133 1134 static const struct file_operations raw_seq_fops = { 1135 .open = raw_v4_seq_open, 1136 .read = seq_read, 1137 .llseek = seq_lseek, 1138 .release = seq_release_net, 1139 }; 1140 1141 static __net_init int raw_init_net(struct net *net) 1142 { 1143 if (!proc_create("raw", 0444, net->proc_net, &raw_seq_fops)) 1144 return -ENOMEM; 1145 1146 return 0; 1147 } 1148 1149 static __net_exit void raw_exit_net(struct net *net) 1150 { 1151 remove_proc_entry("raw", net->proc_net); 1152 } 1153 1154 static __net_initdata struct pernet_operations raw_net_ops = { 1155 .init = raw_init_net, 1156 .exit = raw_exit_net, 1157 }; 1158 1159 int __init raw_proc_init(void) 1160 { 1161 return register_pernet_subsys(&raw_net_ops); 1162 } 1163 1164 void __init raw_proc_exit(void) 1165 { 1166 unregister_pernet_subsys(&raw_net_ops); 1167 } 1168 #endif /* CONFIG_PROC_FS */ 1169