1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * RAW - implementation of IP "raw" sockets. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * 12 * Fixes: 13 * Alan Cox : verify_area() fixed up 14 * Alan Cox : ICMP error handling 15 * Alan Cox : EMSGSIZE if you send too big a packet 16 * Alan Cox : Now uses generic datagrams and shared 17 * skbuff library. No more peek crashes, 18 * no more backlogs 19 * Alan Cox : Checks sk->broadcast. 20 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 21 * Alan Cox : Raw passes ip options too 22 * Alan Cox : Setsocketopt added 23 * Alan Cox : Fixed error return for broadcasts 24 * Alan Cox : Removed wake_up calls 25 * Alan Cox : Use ttl/tos 26 * Alan Cox : Cleaned up old debugging 27 * Alan Cox : Use new kernel side addresses 28 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 29 * Alan Cox : BSD style RAW socket demultiplexing. 30 * Alan Cox : Beginnings of mrouted support. 31 * Alan Cox : Added IP_HDRINCL option. 32 * Alan Cox : Skip broadcast check if BSDism set. 33 * David S. Miller : New socket lookup architecture. 34 */ 35 36 #include <linux/types.h> 37 #include <linux/atomic.h> 38 #include <asm/byteorder.h> 39 #include <asm/current.h> 40 #include <linux/uaccess.h> 41 #include <asm/ioctls.h> 42 #include <linux/stddef.h> 43 #include <linux/slab.h> 44 #include <linux/errno.h> 45 #include <linux/kernel.h> 46 #include <linux/export.h> 47 #include <linux/spinlock.h> 48 #include <linux/sockios.h> 49 #include <linux/socket.h> 50 #include <linux/in.h> 51 #include <linux/mroute.h> 52 #include <linux/netdevice.h> 53 #include <linux/in_route.h> 54 #include <linux/route.h> 55 #include <linux/skbuff.h> 56 #include <linux/igmp.h> 57 #include <net/net_namespace.h> 58 #include <net/dst.h> 59 #include <net/sock.h> 60 #include <linux/ip.h> 61 #include <linux/net.h> 62 #include <net/ip.h> 63 #include <net/icmp.h> 64 #include <net/udp.h> 65 #include <net/raw.h> 66 #include <net/snmp.h> 67 #include <net/tcp_states.h> 68 #include <net/inet_common.h> 69 #include <net/checksum.h> 70 #include <net/xfrm.h> 71 #include <linux/rtnetlink.h> 72 #include <linux/proc_fs.h> 73 #include <linux/seq_file.h> 74 #include <linux/netfilter.h> 75 #include <linux/netfilter_ipv4.h> 76 #include <linux/compat.h> 77 #include <linux/uio.h> 78 79 struct raw_frag_vec { 80 struct msghdr *msg; 81 union { 82 struct icmphdr icmph; 83 char c[1]; 84 } hdr; 85 int hlen; 86 }; 87 88 struct raw_hashinfo raw_v4_hashinfo; 89 EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 90 91 int raw_hash_sk(struct sock *sk) 92 { 93 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 94 struct hlist_nulls_head *hlist; 95 96 hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)]; 97 98 spin_lock(&h->lock); 99 __sk_nulls_add_node_rcu(sk, hlist); 100 sock_set_flag(sk, SOCK_RCU_FREE); 101 spin_unlock(&h->lock); 102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 103 104 return 0; 105 } 106 EXPORT_SYMBOL_GPL(raw_hash_sk); 107 108 void raw_unhash_sk(struct sock *sk) 109 { 110 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 111 112 spin_lock(&h->lock); 113 if (__sk_nulls_del_node_init_rcu(sk)) 114 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 115 spin_unlock(&h->lock); 116 } 117 EXPORT_SYMBOL_GPL(raw_unhash_sk); 118 119 bool raw_v4_match(struct net *net, struct sock *sk, unsigned short num, 120 __be32 raddr, __be32 laddr, int dif, int sdif) 121 { 122 struct inet_sock *inet = inet_sk(sk); 123 124 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 125 !(inet->inet_daddr && inet->inet_daddr != raddr) && 126 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 127 raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) 128 return true; 129 return false; 130 } 131 EXPORT_SYMBOL_GPL(raw_v4_match); 132 133 /* 134 * 0 - deliver 135 * 1 - block 136 */ 137 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) 138 { 139 struct icmphdr _hdr; 140 const struct icmphdr *hdr; 141 142 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 143 sizeof(_hdr), &_hdr); 144 if (!hdr) 145 return 1; 146 147 if (hdr->type < 32) { 148 __u32 data = raw_sk(sk)->filter.data; 149 150 return ((1U << hdr->type) & data) != 0; 151 } 152 153 /* Do not block unknown ICMP types */ 154 return 0; 155 } 156 157 /* IP input processing comes here for RAW socket delivery. 158 * Caller owns SKB, so we must make clones. 159 * 160 * RFC 1122: SHOULD pass TOS value up to the transport layer. 161 * -> It does. And not only TOS, but all IP header. 162 */ 163 static int raw_v4_input(struct net *net, struct sk_buff *skb, 164 const struct iphdr *iph, int hash) 165 { 166 struct hlist_nulls_head *hlist; 167 struct hlist_nulls_node *hnode; 168 int sdif = inet_sdif(skb); 169 int dif = inet_iif(skb); 170 int delivered = 0; 171 struct sock *sk; 172 173 hlist = &raw_v4_hashinfo.ht[hash]; 174 rcu_read_lock(); 175 sk_nulls_for_each(sk, hnode, hlist) { 176 if (!raw_v4_match(net, sk, iph->protocol, 177 iph->saddr, iph->daddr, dif, sdif)) 178 continue; 179 delivered = 1; 180 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && 181 ip_mc_sf_allow(sk, iph->daddr, iph->saddr, 182 skb->dev->ifindex, sdif)) { 183 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 184 185 /* Not releasing hash table! */ 186 if (clone) 187 raw_rcv(sk, clone); 188 } 189 } 190 rcu_read_unlock(); 191 return delivered; 192 } 193 194 int raw_local_deliver(struct sk_buff *skb, int protocol) 195 { 196 struct net *net = dev_net(skb->dev); 197 198 return raw_v4_input(net, skb, ip_hdr(skb), 199 raw_hashfunc(net, protocol)); 200 } 201 202 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 203 { 204 struct inet_sock *inet = inet_sk(sk); 205 const int type = icmp_hdr(skb)->type; 206 const int code = icmp_hdr(skb)->code; 207 int err = 0; 208 int harderr = 0; 209 210 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 211 ipv4_sk_update_pmtu(skb, sk, info); 212 else if (type == ICMP_REDIRECT) { 213 ipv4_sk_redirect(skb, sk); 214 return; 215 } 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 if (code == ICMP_FRAG_NEEDED) { 241 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 242 err = EMSGSIZE; 243 } else { 244 err = icmp_err_convert[code].errno; 245 harderr = icmp_err_convert[code].fatal; 246 } 247 } 248 249 if (inet->recverr) { 250 const struct iphdr *iph = (const 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_error_report(sk); 261 } 262 } 263 264 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 265 { 266 struct net *net = dev_net(skb->dev); 267 struct hlist_nulls_head *hlist; 268 struct hlist_nulls_node *hnode; 269 int dif = skb->dev->ifindex; 270 int sdif = inet_sdif(skb); 271 const struct iphdr *iph; 272 struct sock *sk; 273 int hash; 274 275 hash = raw_hashfunc(net, protocol); 276 hlist = &raw_v4_hashinfo.ht[hash]; 277 278 rcu_read_lock(); 279 sk_nulls_for_each(sk, hnode, hlist) { 280 iph = (const struct iphdr *)skb->data; 281 if (!raw_v4_match(net, sk, iph->protocol, 282 iph->daddr, iph->saddr, dif, sdif)) 283 continue; 284 raw_err(sk, skb, info); 285 } 286 rcu_read_unlock(); 287 } 288 289 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 290 { 291 enum skb_drop_reason reason; 292 293 /* Charge it to the socket. */ 294 295 ipv4_pktinfo_prepare(sk, skb); 296 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) { 297 kfree_skb_reason(skb, reason); 298 return NET_RX_DROP; 299 } 300 301 return NET_RX_SUCCESS; 302 } 303 304 int raw_rcv(struct sock *sk, struct sk_buff *skb) 305 { 306 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 307 atomic_inc(&sk->sk_drops); 308 kfree_skb_reason(skb, SKB_DROP_REASON_XFRM_POLICY); 309 return NET_RX_DROP; 310 } 311 nf_reset_ct(skb); 312 313 skb_push(skb, skb->data - skb_network_header(skb)); 314 315 raw_rcv_skb(sk, skb); 316 return 0; 317 } 318 319 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 320 struct msghdr *msg, size_t length, 321 struct rtable **rtp, unsigned int flags, 322 const struct sockcm_cookie *sockc) 323 { 324 struct inet_sock *inet = inet_sk(sk); 325 struct net *net = sock_net(sk); 326 struct iphdr *iph; 327 struct sk_buff *skb; 328 unsigned int iphlen; 329 int err; 330 struct rtable *rt = *rtp; 331 int hlen, tlen; 332 333 if (length > rt->dst.dev->mtu) { 334 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 335 rt->dst.dev->mtu); 336 return -EMSGSIZE; 337 } 338 if (length < sizeof(struct iphdr)) 339 return -EINVAL; 340 341 if (flags&MSG_PROBE) 342 goto out; 343 344 hlen = LL_RESERVED_SPACE(rt->dst.dev); 345 tlen = rt->dst.dev->needed_tailroom; 346 skb = sock_alloc_send_skb(sk, 347 length + hlen + tlen + 15, 348 flags & MSG_DONTWAIT, &err); 349 if (!skb) 350 goto error; 351 skb_reserve(skb, hlen); 352 353 skb->priority = sk->sk_priority; 354 skb->mark = sockc->mark; 355 skb->tstamp = sockc->transmit_time; 356 skb_dst_set(skb, &rt->dst); 357 *rtp = NULL; 358 359 skb_reset_network_header(skb); 360 iph = ip_hdr(skb); 361 skb_put(skb, length); 362 363 skb->ip_summed = CHECKSUM_NONE; 364 365 skb_setup_tx_timestamp(skb, sockc->tsflags); 366 367 if (flags & MSG_CONFIRM) 368 skb_set_dst_pending_confirm(skb, 1); 369 370 skb->transport_header = skb->network_header; 371 err = -EFAULT; 372 if (memcpy_from_msg(iph, msg, length)) 373 goto error_free; 374 375 iphlen = iph->ihl * 4; 376 377 /* 378 * We don't want to modify the ip header, but we do need to 379 * be sure that it won't cause problems later along the network 380 * stack. Specifically we want to make sure that iph->ihl is a 381 * sane value. If ihl points beyond the length of the buffer passed 382 * in, reject the frame as invalid 383 */ 384 err = -EINVAL; 385 if (iphlen > length) 386 goto error_free; 387 388 if (iphlen >= sizeof(*iph)) { 389 if (!iph->saddr) 390 iph->saddr = fl4->saddr; 391 iph->check = 0; 392 iph->tot_len = htons(length); 393 if (!iph->id) 394 ip_select_ident(net, skb, NULL); 395 396 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 397 skb->transport_header += iphlen; 398 if (iph->protocol == IPPROTO_ICMP && 399 length >= iphlen + sizeof(struct icmphdr)) 400 icmp_out_count(net, ((struct icmphdr *) 401 skb_transport_header(skb))->type); 402 } 403 404 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 405 net, sk, skb, NULL, rt->dst.dev, 406 dst_output); 407 if (err > 0) 408 err = net_xmit_errno(err); 409 if (err) 410 goto error; 411 out: 412 return 0; 413 414 error_free: 415 kfree_skb(skb); 416 error: 417 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 418 if (err == -ENOBUFS && !inet->recverr) 419 err = 0; 420 return err; 421 } 422 423 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 424 { 425 int err; 426 427 if (fl4->flowi4_proto != IPPROTO_ICMP) 428 return 0; 429 430 /* We only need the first two bytes. */ 431 rfv->hlen = 2; 432 433 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 434 if (err) 435 return err; 436 437 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 438 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 439 440 return 0; 441 } 442 443 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 444 struct sk_buff *skb) 445 { 446 struct raw_frag_vec *rfv = from; 447 448 if (offset < rfv->hlen) { 449 int copy = min(rfv->hlen - offset, len); 450 451 if (skb->ip_summed == CHECKSUM_PARTIAL) 452 memcpy(to, rfv->hdr.c + offset, copy); 453 else 454 skb->csum = csum_block_add( 455 skb->csum, 456 csum_partial_copy_nocheck(rfv->hdr.c + offset, 457 to, copy), 458 odd); 459 460 odd = 0; 461 offset += copy; 462 to += copy; 463 len -= copy; 464 465 if (!len) 466 return 0; 467 } 468 469 offset -= rfv->hlen; 470 471 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 472 } 473 474 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 475 { 476 struct inet_sock *inet = inet_sk(sk); 477 struct net *net = sock_net(sk); 478 struct ipcm_cookie ipc; 479 struct rtable *rt = NULL; 480 struct flowi4 fl4; 481 int free = 0; 482 __be32 daddr; 483 __be32 saddr; 484 u8 tos; 485 int err; 486 struct ip_options_data opt_copy; 487 struct raw_frag_vec rfv; 488 int hdrincl; 489 490 err = -EMSGSIZE; 491 if (len > 0xFFFF) 492 goto out; 493 494 /* hdrincl should be READ_ONCE(inet->hdrincl) 495 * but READ_ONCE() doesn't work with bit fields. 496 * Doing this indirectly yields the same result. 497 */ 498 hdrincl = inet->hdrincl; 499 hdrincl = READ_ONCE(hdrincl); 500 /* 501 * Check the flags. 502 */ 503 504 err = -EOPNOTSUPP; 505 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 506 goto out; /* compatibility */ 507 508 /* 509 * Get and verify the address. 510 */ 511 512 if (msg->msg_namelen) { 513 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 514 err = -EINVAL; 515 if (msg->msg_namelen < sizeof(*usin)) 516 goto out; 517 if (usin->sin_family != AF_INET) { 518 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 519 __func__, current->comm); 520 err = -EAFNOSUPPORT; 521 if (usin->sin_family) 522 goto out; 523 } 524 daddr = usin->sin_addr.s_addr; 525 /* ANK: I did not forget to get protocol from port field. 526 * I just do not know, who uses this weirdness. 527 * IP_HDRINCL is much more convenient. 528 */ 529 } else { 530 err = -EDESTADDRREQ; 531 if (sk->sk_state != TCP_ESTABLISHED) 532 goto out; 533 daddr = inet->inet_daddr; 534 } 535 536 ipcm_init_sk(&ipc, inet); 537 538 if (msg->msg_controllen) { 539 err = ip_cmsg_send(sk, msg, &ipc, false); 540 if (unlikely(err)) { 541 kfree(ipc.opt); 542 goto out; 543 } 544 if (ipc.opt) 545 free = 1; 546 } 547 548 saddr = ipc.addr; 549 ipc.addr = daddr; 550 551 if (!ipc.opt) { 552 struct ip_options_rcu *inet_opt; 553 554 rcu_read_lock(); 555 inet_opt = rcu_dereference(inet->inet_opt); 556 if (inet_opt) { 557 memcpy(&opt_copy, inet_opt, 558 sizeof(*inet_opt) + inet_opt->opt.optlen); 559 ipc.opt = &opt_copy.opt; 560 } 561 rcu_read_unlock(); 562 } 563 564 if (ipc.opt) { 565 err = -EINVAL; 566 /* Linux does not mangle headers on raw sockets, 567 * so that IP options + IP_HDRINCL is non-sense. 568 */ 569 if (hdrincl) 570 goto done; 571 if (ipc.opt->opt.srr) { 572 if (!daddr) 573 goto done; 574 daddr = ipc.opt->opt.faddr; 575 } 576 } 577 tos = get_rtconn_flags(&ipc, sk); 578 if (msg->msg_flags & MSG_DONTROUTE) 579 tos |= RTO_ONLINK; 580 581 if (ipv4_is_multicast(daddr)) { 582 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 583 ipc.oif = inet->mc_index; 584 if (!saddr) 585 saddr = inet->mc_addr; 586 } else if (!ipc.oif) { 587 ipc.oif = inet->uc_index; 588 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 589 /* oif is set, packet is to local broadcast 590 * and uc_index is set. oif is most likely set 591 * by sk_bound_dev_if. If uc_index != oif check if the 592 * oif is an L3 master and uc_index is an L3 slave. 593 * If so, we want to allow the send using the uc_index. 594 */ 595 if (ipc.oif != inet->uc_index && 596 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 597 inet->uc_index)) { 598 ipc.oif = inet->uc_index; 599 } 600 } 601 602 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, 603 RT_SCOPE_UNIVERSE, 604 hdrincl ? IPPROTO_RAW : sk->sk_protocol, 605 inet_sk_flowi_flags(sk) | 606 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 607 daddr, saddr, 0, 0, sk->sk_uid); 608 609 if (!hdrincl) { 610 rfv.msg = msg; 611 rfv.hlen = 0; 612 613 err = raw_probe_proto_opt(&rfv, &fl4); 614 if (err) 615 goto done; 616 } 617 618 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 619 rt = ip_route_output_flow(net, &fl4, sk); 620 if (IS_ERR(rt)) { 621 err = PTR_ERR(rt); 622 rt = NULL; 623 goto done; 624 } 625 626 err = -EACCES; 627 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 628 goto done; 629 630 if (msg->msg_flags & MSG_CONFIRM) 631 goto do_confirm; 632 back_from_confirm: 633 634 if (hdrincl) 635 err = raw_send_hdrinc(sk, &fl4, msg, len, 636 &rt, msg->msg_flags, &ipc.sockc); 637 638 else { 639 if (!ipc.addr) 640 ipc.addr = fl4.daddr; 641 lock_sock(sk); 642 err = ip_append_data(sk, &fl4, raw_getfrag, 643 &rfv, len, 0, 644 &ipc, &rt, msg->msg_flags); 645 if (err) 646 ip_flush_pending_frames(sk); 647 else if (!(msg->msg_flags & MSG_MORE)) { 648 err = ip_push_pending_frames(sk, &fl4); 649 if (err == -ENOBUFS && !inet->recverr) 650 err = 0; 651 } 652 release_sock(sk); 653 } 654 done: 655 if (free) 656 kfree(ipc.opt); 657 ip_rt_put(rt); 658 659 out: 660 if (err < 0) 661 return err; 662 return len; 663 664 do_confirm: 665 if (msg->msg_flags & MSG_PROBE) 666 dst_confirm_neigh(&rt->dst, &fl4.daddr); 667 if (!(msg->msg_flags & MSG_PROBE) || len) 668 goto back_from_confirm; 669 err = 0; 670 goto done; 671 } 672 673 static void raw_close(struct sock *sk, long timeout) 674 { 675 /* 676 * Raw sockets may have direct kernel references. Kill them. 677 */ 678 ip_ra_control(sk, 0, NULL); 679 680 sk_common_release(sk); 681 } 682 683 static void raw_destroy(struct sock *sk) 684 { 685 lock_sock(sk); 686 ip_flush_pending_frames(sk); 687 release_sock(sk); 688 } 689 690 /* This gets rid of all the nasties in af_inet. -DaveM */ 691 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 692 { 693 struct inet_sock *inet = inet_sk(sk); 694 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 695 struct net *net = sock_net(sk); 696 u32 tb_id = RT_TABLE_LOCAL; 697 int ret = -EINVAL; 698 int chk_addr_ret; 699 700 lock_sock(sk); 701 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 702 goto out; 703 704 if (sk->sk_bound_dev_if) 705 tb_id = l3mdev_fib_table_by_index(net, 706 sk->sk_bound_dev_if) ? : tb_id; 707 708 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 709 710 ret = -EADDRNOTAVAIL; 711 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 712 chk_addr_ret)) 713 goto out; 714 715 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 716 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 717 inet->inet_saddr = 0; /* Use device */ 718 sk_dst_reset(sk); 719 ret = 0; 720 out: 721 release_sock(sk); 722 return ret; 723 } 724 725 /* 726 * This should be easy, if there is something there 727 * we return it, otherwise we block. 728 */ 729 730 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 731 int flags, int *addr_len) 732 { 733 struct inet_sock *inet = inet_sk(sk); 734 size_t copied = 0; 735 int err = -EOPNOTSUPP; 736 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 737 struct sk_buff *skb; 738 739 if (flags & MSG_OOB) 740 goto out; 741 742 if (flags & MSG_ERRQUEUE) { 743 err = ip_recv_error(sk, msg, len, addr_len); 744 goto out; 745 } 746 747 skb = skb_recv_datagram(sk, flags, &err); 748 if (!skb) 749 goto out; 750 751 copied = skb->len; 752 if (len < copied) { 753 msg->msg_flags |= MSG_TRUNC; 754 copied = len; 755 } 756 757 err = skb_copy_datagram_msg(skb, 0, msg, copied); 758 if (err) 759 goto done; 760 761 sock_recv_cmsgs(msg, sk, skb); 762 763 /* Copy the address. */ 764 if (sin) { 765 sin->sin_family = AF_INET; 766 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 767 sin->sin_port = 0; 768 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 769 *addr_len = sizeof(*sin); 770 } 771 if (inet->cmsg_flags) 772 ip_cmsg_recv(msg, skb); 773 if (flags & MSG_TRUNC) 774 copied = skb->len; 775 done: 776 skb_free_datagram(sk, skb); 777 out: 778 if (err) 779 return err; 780 return copied; 781 } 782 783 static int raw_sk_init(struct sock *sk) 784 { 785 struct raw_sock *rp = raw_sk(sk); 786 787 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 788 memset(&rp->filter, 0, sizeof(rp->filter)); 789 return 0; 790 } 791 792 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 793 { 794 if (optlen > sizeof(struct icmp_filter)) 795 optlen = sizeof(struct icmp_filter); 796 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 797 return -EFAULT; 798 return 0; 799 } 800 801 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 802 { 803 int len, ret = -EFAULT; 804 805 if (get_user(len, optlen)) 806 goto out; 807 ret = -EINVAL; 808 if (len < 0) 809 goto out; 810 if (len > sizeof(struct icmp_filter)) 811 len = sizeof(struct icmp_filter); 812 ret = -EFAULT; 813 if (put_user(len, optlen) || 814 copy_to_user(optval, &raw_sk(sk)->filter, len)) 815 goto out; 816 ret = 0; 817 out: return ret; 818 } 819 820 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 821 sockptr_t optval, unsigned int optlen) 822 { 823 if (optname == ICMP_FILTER) { 824 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 825 return -EOPNOTSUPP; 826 else 827 return raw_seticmpfilter(sk, optval, optlen); 828 } 829 return -ENOPROTOOPT; 830 } 831 832 static int raw_setsockopt(struct sock *sk, int level, int optname, 833 sockptr_t optval, unsigned int optlen) 834 { 835 if (level != SOL_RAW) 836 return ip_setsockopt(sk, level, optname, optval, optlen); 837 return do_raw_setsockopt(sk, level, optname, optval, optlen); 838 } 839 840 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 841 char __user *optval, int __user *optlen) 842 { 843 if (optname == ICMP_FILTER) { 844 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 845 return -EOPNOTSUPP; 846 else 847 return raw_geticmpfilter(sk, optval, optlen); 848 } 849 return -ENOPROTOOPT; 850 } 851 852 static int raw_getsockopt(struct sock *sk, int level, int optname, 853 char __user *optval, int __user *optlen) 854 { 855 if (level != SOL_RAW) 856 return ip_getsockopt(sk, level, optname, optval, optlen); 857 return do_raw_getsockopt(sk, level, optname, optval, optlen); 858 } 859 860 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 861 { 862 switch (cmd) { 863 case SIOCOUTQ: { 864 int amount = sk_wmem_alloc_get(sk); 865 866 return put_user(amount, (int __user *)arg); 867 } 868 case SIOCINQ: { 869 struct sk_buff *skb; 870 int amount = 0; 871 872 spin_lock_bh(&sk->sk_receive_queue.lock); 873 skb = skb_peek(&sk->sk_receive_queue); 874 if (skb) 875 amount = skb->len; 876 spin_unlock_bh(&sk->sk_receive_queue.lock); 877 return put_user(amount, (int __user *)arg); 878 } 879 880 default: 881 #ifdef CONFIG_IP_MROUTE 882 return ipmr_ioctl(sk, cmd, (void __user *)arg); 883 #else 884 return -ENOIOCTLCMD; 885 #endif 886 } 887 } 888 889 #ifdef CONFIG_COMPAT 890 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 891 { 892 switch (cmd) { 893 case SIOCOUTQ: 894 case SIOCINQ: 895 return -ENOIOCTLCMD; 896 default: 897 #ifdef CONFIG_IP_MROUTE 898 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 899 #else 900 return -ENOIOCTLCMD; 901 #endif 902 } 903 } 904 #endif 905 906 int raw_abort(struct sock *sk, int err) 907 { 908 lock_sock(sk); 909 910 sk->sk_err = err; 911 sk_error_report(sk); 912 __udp_disconnect(sk, 0); 913 914 release_sock(sk); 915 916 return 0; 917 } 918 EXPORT_SYMBOL_GPL(raw_abort); 919 920 struct proto raw_prot = { 921 .name = "RAW", 922 .owner = THIS_MODULE, 923 .close = raw_close, 924 .destroy = raw_destroy, 925 .connect = ip4_datagram_connect, 926 .disconnect = __udp_disconnect, 927 .ioctl = raw_ioctl, 928 .init = raw_sk_init, 929 .setsockopt = raw_setsockopt, 930 .getsockopt = raw_getsockopt, 931 .sendmsg = raw_sendmsg, 932 .recvmsg = raw_recvmsg, 933 .bind = raw_bind, 934 .backlog_rcv = raw_rcv_skb, 935 .release_cb = ip4_datagram_release_cb, 936 .hash = raw_hash_sk, 937 .unhash = raw_unhash_sk, 938 .obj_size = sizeof(struct raw_sock), 939 .useroffset = offsetof(struct raw_sock, filter), 940 .usersize = sizeof_field(struct raw_sock, filter), 941 .h.raw_hash = &raw_v4_hashinfo, 942 #ifdef CONFIG_COMPAT 943 .compat_ioctl = compat_raw_ioctl, 944 #endif 945 .diag_destroy = raw_abort, 946 }; 947 948 #ifdef CONFIG_PROC_FS 949 static struct sock *raw_get_first(struct seq_file *seq, int bucket) 950 { 951 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 952 struct raw_iter_state *state = raw_seq_private(seq); 953 struct hlist_nulls_head *hlist; 954 struct hlist_nulls_node *hnode; 955 struct sock *sk; 956 957 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE; 958 ++state->bucket) { 959 hlist = &h->ht[state->bucket]; 960 sk_nulls_for_each(sk, hnode, hlist) { 961 if (sock_net(sk) == seq_file_net(seq)) 962 return sk; 963 } 964 } 965 return NULL; 966 } 967 968 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 969 { 970 struct raw_iter_state *state = raw_seq_private(seq); 971 972 do { 973 sk = sk_nulls_next(sk); 974 } while (sk && sock_net(sk) != seq_file_net(seq)); 975 976 if (!sk) 977 return raw_get_first(seq, state->bucket + 1); 978 return sk; 979 } 980 981 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 982 { 983 struct sock *sk = raw_get_first(seq, 0); 984 985 if (sk) 986 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 987 --pos; 988 return pos ? NULL : sk; 989 } 990 991 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 992 __acquires(RCU) 993 { 994 rcu_read_lock(); 995 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 996 } 997 EXPORT_SYMBOL_GPL(raw_seq_start); 998 999 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1000 { 1001 struct sock *sk; 1002 1003 if (v == SEQ_START_TOKEN) 1004 sk = raw_get_first(seq, 0); 1005 else 1006 sk = raw_get_next(seq, v); 1007 ++*pos; 1008 return sk; 1009 } 1010 EXPORT_SYMBOL_GPL(raw_seq_next); 1011 1012 void raw_seq_stop(struct seq_file *seq, void *v) 1013 __releases(RCU) 1014 { 1015 rcu_read_unlock(); 1016 } 1017 EXPORT_SYMBOL_GPL(raw_seq_stop); 1018 1019 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1020 { 1021 struct inet_sock *inet = inet_sk(sp); 1022 __be32 dest = inet->inet_daddr, 1023 src = inet->inet_rcv_saddr; 1024 __u16 destp = 0, 1025 srcp = inet->inet_num; 1026 1027 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1028 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1029 i, src, srcp, dest, destp, sp->sk_state, 1030 sk_wmem_alloc_get(sp), 1031 sk_rmem_alloc_get(sp), 1032 0, 0L, 0, 1033 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1034 0, sock_i_ino(sp), 1035 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1036 } 1037 1038 static int raw_seq_show(struct seq_file *seq, void *v) 1039 { 1040 if (v == SEQ_START_TOKEN) 1041 seq_printf(seq, " sl local_address rem_address st tx_queue " 1042 "rx_queue tr tm->when retrnsmt uid timeout " 1043 "inode ref pointer drops\n"); 1044 else 1045 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1046 return 0; 1047 } 1048 1049 static const struct seq_operations raw_seq_ops = { 1050 .start = raw_seq_start, 1051 .next = raw_seq_next, 1052 .stop = raw_seq_stop, 1053 .show = raw_seq_show, 1054 }; 1055 1056 static __net_init int raw_init_net(struct net *net) 1057 { 1058 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1059 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1060 return -ENOMEM; 1061 1062 return 0; 1063 } 1064 1065 static __net_exit void raw_exit_net(struct net *net) 1066 { 1067 remove_proc_entry("raw", net->proc_net); 1068 } 1069 1070 static __net_initdata struct pernet_operations raw_net_ops = { 1071 .init = raw_init_net, 1072 .exit = raw_exit_net, 1073 }; 1074 1075 int __init raw_proc_init(void) 1076 { 1077 1078 return register_pernet_subsys(&raw_net_ops); 1079 } 1080 1081 void __init raw_proc_exit(void) 1082 { 1083 unregister_pernet_subsys(&raw_net_ops); 1084 } 1085 #endif /* CONFIG_PROC_FS */ 1086 1087 static void raw_sysctl_init_net(struct net *net) 1088 { 1089 #ifdef CONFIG_NET_L3_MASTER_DEV 1090 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1091 #endif 1092 } 1093 1094 static int __net_init raw_sysctl_init(struct net *net) 1095 { 1096 raw_sysctl_init_net(net); 1097 return 0; 1098 } 1099 1100 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1101 .init = raw_sysctl_init, 1102 }; 1103 1104 void __init raw_init(void) 1105 { 1106 raw_sysctl_init_net(&init_net); 1107 if (register_pernet_subsys(&raw_sysctl_ops)) 1108 panic("RAW: failed to init sysctl parameters.\n"); 1109 } 1110