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[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 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 sk_buff *skb, const struct iphdr *iph, int hash) 164 { 165 struct net *net = dev_net(skb->dev); 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 int hash = protocol & (RAW_HTABLE_SIZE - 1); 197 198 return raw_v4_input(skb, ip_hdr(skb), hash); 199 } 200 201 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 202 { 203 struct inet_sock *inet = inet_sk(sk); 204 const int type = icmp_hdr(skb)->type; 205 const int code = icmp_hdr(skb)->code; 206 int err = 0; 207 int harderr = 0; 208 209 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 210 ipv4_sk_update_pmtu(skb, sk, info); 211 else if (type == ICMP_REDIRECT) { 212 ipv4_sk_redirect(skb, sk); 213 return; 214 } 215 216 /* Report error on raw socket, if: 217 1. User requested ip_recverr. 218 2. Socket is connected (otherwise the error indication 219 is useless without ip_recverr and error is hard. 220 */ 221 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 222 return; 223 224 switch (type) { 225 default: 226 case ICMP_TIME_EXCEEDED: 227 err = EHOSTUNREACH; 228 break; 229 case ICMP_SOURCE_QUENCH: 230 return; 231 case ICMP_PARAMETERPROB: 232 err = EPROTO; 233 harderr = 1; 234 break; 235 case ICMP_DEST_UNREACH: 236 err = EHOSTUNREACH; 237 if (code > NR_ICMP_UNREACH) 238 break; 239 if (code == ICMP_FRAG_NEEDED) { 240 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 241 err = EMSGSIZE; 242 } else { 243 err = icmp_err_convert[code].errno; 244 harderr = icmp_err_convert[code].fatal; 245 } 246 } 247 248 if (inet->recverr) { 249 const struct iphdr *iph = (const 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_error_report(sk); 260 } 261 } 262 263 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 264 { 265 struct net *net = dev_net(skb->dev); 266 struct hlist_nulls_head *hlist; 267 struct hlist_nulls_node *hnode; 268 int dif = skb->dev->ifindex; 269 int sdif = inet_sdif(skb); 270 const struct iphdr *iph; 271 struct sock *sk; 272 int hash; 273 274 hash = protocol & (RAW_HTABLE_SIZE - 1); 275 hlist = &raw_v4_hashinfo.ht[hash]; 276 277 rcu_read_lock(); 278 sk_nulls_for_each(sk, hnode, hlist) { 279 iph = (const struct iphdr *)skb->data; 280 if (!raw_v4_match(net, sk, iph->protocol, 281 iph->daddr, iph->saddr, dif, sdif)) 282 continue; 283 raw_err(sk, skb, info); 284 } 285 rcu_read_unlock(); 286 } 287 288 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 289 { 290 /* Charge it to the socket. */ 291 292 ipv4_pktinfo_prepare(sk, skb); 293 if (sock_queue_rcv_skb(sk, skb) < 0) { 294 kfree_skb(skb); 295 return NET_RX_DROP; 296 } 297 298 return NET_RX_SUCCESS; 299 } 300 301 int raw_rcv(struct sock *sk, struct sk_buff *skb) 302 { 303 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 304 atomic_inc(&sk->sk_drops); 305 kfree_skb(skb); 306 return NET_RX_DROP; 307 } 308 nf_reset_ct(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, struct flowi4 *fl4, 317 struct msghdr *msg, size_t length, 318 struct rtable **rtp, unsigned int flags, 319 const struct sockcm_cookie *sockc) 320 { 321 struct inet_sock *inet = inet_sk(sk); 322 struct net *net = sock_net(sk); 323 struct iphdr *iph; 324 struct sk_buff *skb; 325 unsigned int iphlen; 326 int err; 327 struct rtable *rt = *rtp; 328 int hlen, tlen; 329 330 if (length > rt->dst.dev->mtu) { 331 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 332 rt->dst.dev->mtu); 333 return -EMSGSIZE; 334 } 335 if (length < sizeof(struct iphdr)) 336 return -EINVAL; 337 338 if (flags&MSG_PROBE) 339 goto out; 340 341 hlen = LL_RESERVED_SPACE(rt->dst.dev); 342 tlen = rt->dst.dev->needed_tailroom; 343 skb = sock_alloc_send_skb(sk, 344 length + hlen + tlen + 15, 345 flags & MSG_DONTWAIT, &err); 346 if (!skb) 347 goto error; 348 skb_reserve(skb, hlen); 349 350 skb->priority = sk->sk_priority; 351 skb->mark = sockc->mark; 352 skb->tstamp = sockc->transmit_time; 353 skb_dst_set(skb, &rt->dst); 354 *rtp = NULL; 355 356 skb_reset_network_header(skb); 357 iph = ip_hdr(skb); 358 skb_put(skb, length); 359 360 skb->ip_summed = CHECKSUM_NONE; 361 362 skb_setup_tx_timestamp(skb, sockc->tsflags); 363 364 if (flags & MSG_CONFIRM) 365 skb_set_dst_pending_confirm(skb, 1); 366 367 skb->transport_header = skb->network_header; 368 err = -EFAULT; 369 if (memcpy_from_msg(iph, msg, length)) 370 goto error_free; 371 372 iphlen = iph->ihl * 4; 373 374 /* 375 * We don't want to modify the ip header, but we do need to 376 * be sure that it won't cause problems later along the network 377 * stack. Specifically we want to make sure that iph->ihl is a 378 * sane value. If ihl points beyond the length of the buffer passed 379 * in, reject the frame as invalid 380 */ 381 err = -EINVAL; 382 if (iphlen > length) 383 goto error_free; 384 385 if (iphlen >= sizeof(*iph)) { 386 if (!iph->saddr) 387 iph->saddr = fl4->saddr; 388 iph->check = 0; 389 iph->tot_len = htons(length); 390 if (!iph->id) 391 ip_select_ident(net, skb, NULL); 392 393 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 394 skb->transport_header += iphlen; 395 if (iph->protocol == IPPROTO_ICMP && 396 length >= iphlen + sizeof(struct icmphdr)) 397 icmp_out_count(net, ((struct icmphdr *) 398 skb_transport_header(skb))->type); 399 } 400 401 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 402 net, sk, skb, NULL, rt->dst.dev, 403 dst_output); 404 if (err > 0) 405 err = net_xmit_errno(err); 406 if (err) 407 goto error; 408 out: 409 return 0; 410 411 error_free: 412 kfree_skb(skb); 413 error: 414 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 415 if (err == -ENOBUFS && !inet->recverr) 416 err = 0; 417 return err; 418 } 419 420 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 421 { 422 int err; 423 424 if (fl4->flowi4_proto != IPPROTO_ICMP) 425 return 0; 426 427 /* We only need the first two bytes. */ 428 rfv->hlen = 2; 429 430 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 431 if (err) 432 return err; 433 434 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 435 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 436 437 return 0; 438 } 439 440 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 441 struct sk_buff *skb) 442 { 443 struct raw_frag_vec *rfv = from; 444 445 if (offset < rfv->hlen) { 446 int copy = min(rfv->hlen - offset, len); 447 448 if (skb->ip_summed == CHECKSUM_PARTIAL) 449 memcpy(to, rfv->hdr.c + offset, copy); 450 else 451 skb->csum = csum_block_add( 452 skb->csum, 453 csum_partial_copy_nocheck(rfv->hdr.c + offset, 454 to, copy), 455 odd); 456 457 odd = 0; 458 offset += copy; 459 to += copy; 460 len -= copy; 461 462 if (!len) 463 return 0; 464 } 465 466 offset -= rfv->hlen; 467 468 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 469 } 470 471 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 472 { 473 struct inet_sock *inet = inet_sk(sk); 474 struct net *net = sock_net(sk); 475 struct ipcm_cookie ipc; 476 struct rtable *rt = NULL; 477 struct flowi4 fl4; 478 int free = 0; 479 __be32 daddr; 480 __be32 saddr; 481 u8 tos; 482 int err; 483 struct ip_options_data opt_copy; 484 struct raw_frag_vec rfv; 485 int hdrincl; 486 487 err = -EMSGSIZE; 488 if (len > 0xFFFF) 489 goto out; 490 491 /* hdrincl should be READ_ONCE(inet->hdrincl) 492 * but READ_ONCE() doesn't work with bit fields. 493 * Doing this indirectly yields the same result. 494 */ 495 hdrincl = inet->hdrincl; 496 hdrincl = READ_ONCE(hdrincl); 497 /* 498 * Check the flags. 499 */ 500 501 err = -EOPNOTSUPP; 502 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 503 goto out; /* compatibility */ 504 505 /* 506 * Get and verify the address. 507 */ 508 509 if (msg->msg_namelen) { 510 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 511 err = -EINVAL; 512 if (msg->msg_namelen < sizeof(*usin)) 513 goto out; 514 if (usin->sin_family != AF_INET) { 515 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 516 __func__, current->comm); 517 err = -EAFNOSUPPORT; 518 if (usin->sin_family) 519 goto out; 520 } 521 daddr = usin->sin_addr.s_addr; 522 /* ANK: I did not forget to get protocol from port field. 523 * I just do not know, who uses this weirdness. 524 * IP_HDRINCL is much more convenient. 525 */ 526 } else { 527 err = -EDESTADDRREQ; 528 if (sk->sk_state != TCP_ESTABLISHED) 529 goto out; 530 daddr = inet->inet_daddr; 531 } 532 533 ipcm_init_sk(&ipc, inet); 534 535 if (msg->msg_controllen) { 536 err = ip_cmsg_send(sk, msg, &ipc, false); 537 if (unlikely(err)) { 538 kfree(ipc.opt); 539 goto out; 540 } 541 if (ipc.opt) 542 free = 1; 543 } 544 545 saddr = ipc.addr; 546 ipc.addr = daddr; 547 548 if (!ipc.opt) { 549 struct ip_options_rcu *inet_opt; 550 551 rcu_read_lock(); 552 inet_opt = rcu_dereference(inet->inet_opt); 553 if (inet_opt) { 554 memcpy(&opt_copy, inet_opt, 555 sizeof(*inet_opt) + inet_opt->opt.optlen); 556 ipc.opt = &opt_copy.opt; 557 } 558 rcu_read_unlock(); 559 } 560 561 if (ipc.opt) { 562 err = -EINVAL; 563 /* Linux does not mangle headers on raw sockets, 564 * so that IP options + IP_HDRINCL is non-sense. 565 */ 566 if (hdrincl) 567 goto done; 568 if (ipc.opt->opt.srr) { 569 if (!daddr) 570 goto done; 571 daddr = ipc.opt->opt.faddr; 572 } 573 } 574 tos = get_rtconn_flags(&ipc, sk); 575 if (msg->msg_flags & MSG_DONTROUTE) 576 tos |= RTO_ONLINK; 577 578 if (ipv4_is_multicast(daddr)) { 579 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 580 ipc.oif = inet->mc_index; 581 if (!saddr) 582 saddr = inet->mc_addr; 583 } else if (!ipc.oif) { 584 ipc.oif = inet->uc_index; 585 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 586 /* oif is set, packet is to local broadcast 587 * and uc_index is set. oif is most likely set 588 * by sk_bound_dev_if. If uc_index != oif check if the 589 * oif is an L3 master and uc_index is an L3 slave. 590 * If so, we want to allow the send using the uc_index. 591 */ 592 if (ipc.oif != inet->uc_index && 593 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 594 inet->uc_index)) { 595 ipc.oif = inet->uc_index; 596 } 597 } 598 599 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, 600 RT_SCOPE_UNIVERSE, 601 hdrincl ? IPPROTO_RAW : sk->sk_protocol, 602 inet_sk_flowi_flags(sk) | 603 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 604 daddr, saddr, 0, 0, sk->sk_uid); 605 606 if (!hdrincl) { 607 rfv.msg = msg; 608 rfv.hlen = 0; 609 610 err = raw_probe_proto_opt(&rfv, &fl4); 611 if (err) 612 goto done; 613 } 614 615 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 616 rt = ip_route_output_flow(net, &fl4, sk); 617 if (IS_ERR(rt)) { 618 err = PTR_ERR(rt); 619 rt = NULL; 620 goto done; 621 } 622 623 err = -EACCES; 624 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 625 goto done; 626 627 if (msg->msg_flags & MSG_CONFIRM) 628 goto do_confirm; 629 back_from_confirm: 630 631 if (hdrincl) 632 err = raw_send_hdrinc(sk, &fl4, msg, len, 633 &rt, msg->msg_flags, &ipc.sockc); 634 635 else { 636 if (!ipc.addr) 637 ipc.addr = fl4.daddr; 638 lock_sock(sk); 639 err = ip_append_data(sk, &fl4, raw_getfrag, 640 &rfv, len, 0, 641 &ipc, &rt, msg->msg_flags); 642 if (err) 643 ip_flush_pending_frames(sk); 644 else if (!(msg->msg_flags & MSG_MORE)) { 645 err = ip_push_pending_frames(sk, &fl4); 646 if (err == -ENOBUFS && !inet->recverr) 647 err = 0; 648 } 649 release_sock(sk); 650 } 651 done: 652 if (free) 653 kfree(ipc.opt); 654 ip_rt_put(rt); 655 656 out: 657 if (err < 0) 658 return err; 659 return len; 660 661 do_confirm: 662 if (msg->msg_flags & MSG_PROBE) 663 dst_confirm_neigh(&rt->dst, &fl4.daddr); 664 if (!(msg->msg_flags & MSG_PROBE) || len) 665 goto back_from_confirm; 666 err = 0; 667 goto done; 668 } 669 670 static void raw_close(struct sock *sk, long timeout) 671 { 672 /* 673 * Raw sockets may have direct kernel references. Kill them. 674 */ 675 ip_ra_control(sk, 0, NULL); 676 677 sk_common_release(sk); 678 } 679 680 static void raw_destroy(struct sock *sk) 681 { 682 lock_sock(sk); 683 ip_flush_pending_frames(sk); 684 release_sock(sk); 685 } 686 687 /* This gets rid of all the nasties in af_inet. -DaveM */ 688 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 689 { 690 struct inet_sock *inet = inet_sk(sk); 691 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 692 struct net *net = sock_net(sk); 693 u32 tb_id = RT_TABLE_LOCAL; 694 int ret = -EINVAL; 695 int chk_addr_ret; 696 697 lock_sock(sk); 698 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 699 goto out; 700 701 if (sk->sk_bound_dev_if) 702 tb_id = l3mdev_fib_table_by_index(net, 703 sk->sk_bound_dev_if) ? : tb_id; 704 705 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 706 707 ret = -EADDRNOTAVAIL; 708 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 709 chk_addr_ret)) 710 goto out; 711 712 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 713 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 714 inet->inet_saddr = 0; /* Use device */ 715 sk_dst_reset(sk); 716 ret = 0; 717 out: 718 release_sock(sk); 719 return ret; 720 } 721 722 /* 723 * This should be easy, if there is something there 724 * we return it, otherwise we block. 725 */ 726 727 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 728 int flags, int *addr_len) 729 { 730 struct inet_sock *inet = inet_sk(sk); 731 size_t copied = 0; 732 int err = -EOPNOTSUPP; 733 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 734 struct sk_buff *skb; 735 736 if (flags & MSG_OOB) 737 goto out; 738 739 if (flags & MSG_ERRQUEUE) { 740 err = ip_recv_error(sk, msg, len, addr_len); 741 goto out; 742 } 743 744 skb = skb_recv_datagram(sk, flags, &err); 745 if (!skb) 746 goto out; 747 748 copied = skb->len; 749 if (len < copied) { 750 msg->msg_flags |= MSG_TRUNC; 751 copied = len; 752 } 753 754 err = skb_copy_datagram_msg(skb, 0, msg, copied); 755 if (err) 756 goto done; 757 758 sock_recv_cmsgs(msg, sk, skb); 759 760 /* Copy the address. */ 761 if (sin) { 762 sin->sin_family = AF_INET; 763 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 764 sin->sin_port = 0; 765 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 766 *addr_len = sizeof(*sin); 767 } 768 if (inet->cmsg_flags) 769 ip_cmsg_recv(msg, skb); 770 if (flags & MSG_TRUNC) 771 copied = skb->len; 772 done: 773 skb_free_datagram(sk, skb); 774 out: 775 if (err) 776 return err; 777 return copied; 778 } 779 780 static int raw_sk_init(struct sock *sk) 781 { 782 struct raw_sock *rp = raw_sk(sk); 783 784 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 785 memset(&rp->filter, 0, sizeof(rp->filter)); 786 return 0; 787 } 788 789 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 790 { 791 if (optlen > sizeof(struct icmp_filter)) 792 optlen = sizeof(struct icmp_filter); 793 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 794 return -EFAULT; 795 return 0; 796 } 797 798 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 799 { 800 int len, ret = -EFAULT; 801 802 if (get_user(len, optlen)) 803 goto out; 804 ret = -EINVAL; 805 if (len < 0) 806 goto out; 807 if (len > sizeof(struct icmp_filter)) 808 len = sizeof(struct icmp_filter); 809 ret = -EFAULT; 810 if (put_user(len, optlen) || 811 copy_to_user(optval, &raw_sk(sk)->filter, len)) 812 goto out; 813 ret = 0; 814 out: return ret; 815 } 816 817 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 818 sockptr_t optval, unsigned int optlen) 819 { 820 if (optname == ICMP_FILTER) { 821 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 822 return -EOPNOTSUPP; 823 else 824 return raw_seticmpfilter(sk, optval, optlen); 825 } 826 return -ENOPROTOOPT; 827 } 828 829 static int raw_setsockopt(struct sock *sk, int level, int optname, 830 sockptr_t optval, unsigned int optlen) 831 { 832 if (level != SOL_RAW) 833 return ip_setsockopt(sk, level, optname, optval, optlen); 834 return do_raw_setsockopt(sk, level, optname, optval, optlen); 835 } 836 837 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 838 char __user *optval, int __user *optlen) 839 { 840 if (optname == ICMP_FILTER) { 841 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 842 return -EOPNOTSUPP; 843 else 844 return raw_geticmpfilter(sk, optval, optlen); 845 } 846 return -ENOPROTOOPT; 847 } 848 849 static int raw_getsockopt(struct sock *sk, int level, int optname, 850 char __user *optval, int __user *optlen) 851 { 852 if (level != SOL_RAW) 853 return ip_getsockopt(sk, level, optname, optval, optlen); 854 return do_raw_getsockopt(sk, level, optname, optval, optlen); 855 } 856 857 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 858 { 859 switch (cmd) { 860 case SIOCOUTQ: { 861 int amount = sk_wmem_alloc_get(sk); 862 863 return put_user(amount, (int __user *)arg); 864 } 865 case SIOCINQ: { 866 struct sk_buff *skb; 867 int amount = 0; 868 869 spin_lock_bh(&sk->sk_receive_queue.lock); 870 skb = skb_peek(&sk->sk_receive_queue); 871 if (skb) 872 amount = skb->len; 873 spin_unlock_bh(&sk->sk_receive_queue.lock); 874 return put_user(amount, (int __user *)arg); 875 } 876 877 default: 878 #ifdef CONFIG_IP_MROUTE 879 return ipmr_ioctl(sk, cmd, (void __user *)arg); 880 #else 881 return -ENOIOCTLCMD; 882 #endif 883 } 884 } 885 886 #ifdef CONFIG_COMPAT 887 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 888 { 889 switch (cmd) { 890 case SIOCOUTQ: 891 case SIOCINQ: 892 return -ENOIOCTLCMD; 893 default: 894 #ifdef CONFIG_IP_MROUTE 895 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 896 #else 897 return -ENOIOCTLCMD; 898 #endif 899 } 900 } 901 #endif 902 903 int raw_abort(struct sock *sk, int err) 904 { 905 lock_sock(sk); 906 907 sk->sk_err = err; 908 sk_error_report(sk); 909 __udp_disconnect(sk, 0); 910 911 release_sock(sk); 912 913 return 0; 914 } 915 EXPORT_SYMBOL_GPL(raw_abort); 916 917 struct proto raw_prot = { 918 .name = "RAW", 919 .owner = THIS_MODULE, 920 .close = raw_close, 921 .destroy = raw_destroy, 922 .connect = ip4_datagram_connect, 923 .disconnect = __udp_disconnect, 924 .ioctl = raw_ioctl, 925 .init = raw_sk_init, 926 .setsockopt = raw_setsockopt, 927 .getsockopt = raw_getsockopt, 928 .sendmsg = raw_sendmsg, 929 .recvmsg = raw_recvmsg, 930 .bind = raw_bind, 931 .backlog_rcv = raw_rcv_skb, 932 .release_cb = ip4_datagram_release_cb, 933 .hash = raw_hash_sk, 934 .unhash = raw_unhash_sk, 935 .obj_size = sizeof(struct raw_sock), 936 .useroffset = offsetof(struct raw_sock, filter), 937 .usersize = sizeof_field(struct raw_sock, filter), 938 .h.raw_hash = &raw_v4_hashinfo, 939 #ifdef CONFIG_COMPAT 940 .compat_ioctl = compat_raw_ioctl, 941 #endif 942 .diag_destroy = raw_abort, 943 }; 944 945 #ifdef CONFIG_PROC_FS 946 static struct sock *raw_get_first(struct seq_file *seq, int bucket) 947 { 948 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 949 struct raw_iter_state *state = raw_seq_private(seq); 950 struct hlist_nulls_head *hlist; 951 struct hlist_nulls_node *hnode; 952 struct sock *sk; 953 954 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE; 955 ++state->bucket) { 956 hlist = &h->ht[state->bucket]; 957 sk_nulls_for_each(sk, hnode, hlist) { 958 if (sock_net(sk) == seq_file_net(seq)) 959 return sk; 960 } 961 } 962 return NULL; 963 } 964 965 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 966 { 967 struct raw_iter_state *state = raw_seq_private(seq); 968 969 do { 970 sk = sk_nulls_next(sk); 971 } while (sk && sock_net(sk) != seq_file_net(seq)); 972 973 if (!sk) 974 return raw_get_first(seq, state->bucket + 1); 975 return sk; 976 } 977 978 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 979 { 980 struct sock *sk = raw_get_first(seq, 0); 981 982 if (sk) 983 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 984 --pos; 985 return pos ? NULL : sk; 986 } 987 988 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 989 __acquires(RCU) 990 { 991 rcu_read_lock(); 992 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 993 } 994 EXPORT_SYMBOL_GPL(raw_seq_start); 995 996 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 997 { 998 struct sock *sk; 999 1000 if (v == SEQ_START_TOKEN) 1001 sk = raw_get_first(seq, 0); 1002 else 1003 sk = raw_get_next(seq, v); 1004 ++*pos; 1005 return sk; 1006 } 1007 EXPORT_SYMBOL_GPL(raw_seq_next); 1008 1009 void raw_seq_stop(struct seq_file *seq, void *v) 1010 __releases(RCU) 1011 { 1012 rcu_read_unlock(); 1013 } 1014 EXPORT_SYMBOL_GPL(raw_seq_stop); 1015 1016 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1017 { 1018 struct inet_sock *inet = inet_sk(sp); 1019 __be32 dest = inet->inet_daddr, 1020 src = inet->inet_rcv_saddr; 1021 __u16 destp = 0, 1022 srcp = inet->inet_num; 1023 1024 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1025 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1026 i, src, srcp, dest, destp, sp->sk_state, 1027 sk_wmem_alloc_get(sp), 1028 sk_rmem_alloc_get(sp), 1029 0, 0L, 0, 1030 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1031 0, sock_i_ino(sp), 1032 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1033 } 1034 1035 static int raw_seq_show(struct seq_file *seq, void *v) 1036 { 1037 if (v == SEQ_START_TOKEN) 1038 seq_printf(seq, " sl local_address rem_address st tx_queue " 1039 "rx_queue tr tm->when retrnsmt uid timeout " 1040 "inode ref pointer drops\n"); 1041 else 1042 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1043 return 0; 1044 } 1045 1046 static const struct seq_operations raw_seq_ops = { 1047 .start = raw_seq_start, 1048 .next = raw_seq_next, 1049 .stop = raw_seq_stop, 1050 .show = raw_seq_show, 1051 }; 1052 1053 static __net_init int raw_init_net(struct net *net) 1054 { 1055 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1056 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1057 return -ENOMEM; 1058 1059 return 0; 1060 } 1061 1062 static __net_exit void raw_exit_net(struct net *net) 1063 { 1064 remove_proc_entry("raw", net->proc_net); 1065 } 1066 1067 static __net_initdata struct pernet_operations raw_net_ops = { 1068 .init = raw_init_net, 1069 .exit = raw_exit_net, 1070 }; 1071 1072 int __init raw_proc_init(void) 1073 { 1074 1075 return register_pernet_subsys(&raw_net_ops); 1076 } 1077 1078 void __init raw_proc_exit(void) 1079 { 1080 unregister_pernet_subsys(&raw_net_ops); 1081 } 1082 #endif /* CONFIG_PROC_FS */ 1083 1084 static void raw_sysctl_init_net(struct net *net) 1085 { 1086 #ifdef CONFIG_NET_L3_MASTER_DEV 1087 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1088 #endif 1089 } 1090 1091 static int __net_init raw_sysctl_init(struct net *net) 1092 { 1093 raw_sysctl_init_net(net); 1094 return 0; 1095 } 1096 1097 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1098 .init = raw_sysctl_init, 1099 }; 1100 1101 void __init raw_init(void) 1102 { 1103 raw_sysctl_init_net(&init_net); 1104 if (register_pernet_subsys(&raw_sysctl_ops)) 1105 panic("RAW: failed to init sysctl parameters.\n"); 1106 } 1107