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 79struct raw_frag_vec { 80 struct msghdr *msg; 81 union { 82 struct icmphdr icmph; 83 char c[1]; 84 } hdr; 85 int hlen; 86}; 87 88struct raw_hashinfo raw_v4_hashinfo = { 89 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 90}; 91EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 92 93int raw_hash_sk(struct sock *sk) 94{ 95 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 96 struct hlist_head *head; 97 98 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 99 100 write_lock_bh(&h->lock); 101 sk_add_node(sk, head); 102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 103 write_unlock_bh(&h->lock); 104 105 return 0; 106} 107EXPORT_SYMBOL_GPL(raw_hash_sk); 108 109void raw_unhash_sk(struct sock *sk) 110{ 111 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 112 113 write_lock_bh(&h->lock); 114 if (sk_del_node_init(sk)) 115 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 116 write_unlock_bh(&h->lock); 117} 118EXPORT_SYMBOL_GPL(raw_unhash_sk); 119 120struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, 121 unsigned short num, __be32 raddr, __be32 laddr, 122 int dif, int sdif) 123{ 124 sk_for_each_from(sk) { 125 struct inet_sock *inet = inet_sk(sk); 126 127 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 128 !(inet->inet_daddr && inet->inet_daddr != raddr) && 129 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 130 raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) 131 goto found; /* gotcha */ 132 } 133 sk = NULL; 134found: 135 return sk; 136} 137EXPORT_SYMBOL_GPL(__raw_v4_lookup); 138 139/* 140 * 0 - deliver 141 * 1 - block 142 */ 143static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) 144{ 145 struct icmphdr _hdr; 146 const struct icmphdr *hdr; 147 148 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 149 sizeof(_hdr), &_hdr); 150 if (!hdr) 151 return 1; 152 153 if (hdr->type < 32) { 154 __u32 data = raw_sk(sk)->filter.data; 155 156 return ((1U << hdr->type) & data) != 0; 157 } 158 159 /* Do not block unknown ICMP types */ 160 return 0; 161} 162 163/* IP input processing comes here for RAW socket delivery. 164 * Caller owns SKB, so we must make clones. 165 * 166 * RFC 1122: SHOULD pass TOS value up to the transport layer. 167 * -> It does. And not only TOS, but all IP header. 168 */ 169static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash) 170{ 171 int sdif = inet_sdif(skb); 172 int dif = inet_iif(skb); 173 struct sock *sk; 174 struct hlist_head *head; 175 int delivered = 0; 176 struct net *net; 177 178 read_lock(&raw_v4_hashinfo.lock); 179 head = &raw_v4_hashinfo.ht[hash]; 180 if (hlist_empty(head)) 181 goto out; 182 183 net = dev_net(skb->dev); 184 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, 185 iph->saddr, iph->daddr, dif, sdif); 186 187 while (sk) { 188 delivered = 1; 189 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && 190 ip_mc_sf_allow(sk, iph->daddr, iph->saddr, 191 skb->dev->ifindex, sdif)) { 192 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 193 194 /* Not releasing hash table! */ 195 if (clone) 196 raw_rcv(sk, clone); 197 } 198 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, 199 iph->saddr, iph->daddr, 200 dif, sdif); 201 } 202out: 203 read_unlock(&raw_v4_hashinfo.lock); 204 return delivered; 205} 206 207int raw_local_deliver(struct sk_buff *skb, int protocol) 208{ 209 int hash; 210 struct sock *raw_sk; 211 212 hash = protocol & (RAW_HTABLE_SIZE - 1); 213 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 214 215 /* If there maybe a raw socket we must check - if not we 216 * don't care less 217 */ 218 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) 219 raw_sk = NULL; 220 221 return raw_sk != NULL; 222 223} 224 225static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 226{ 227 struct inet_sock *inet = inet_sk(sk); 228 const int type = icmp_hdr(skb)->type; 229 const int code = icmp_hdr(skb)->code; 230 int err = 0; 231 int harderr = 0; 232 233 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 234 ipv4_sk_update_pmtu(skb, sk, info); 235 else if (type == ICMP_REDIRECT) { 236 ipv4_sk_redirect(skb, sk); 237 return; 238 } 239 240 /* Report error on raw socket, if: 241 1. User requested ip_recverr. 242 2. Socket is connected (otherwise the error indication 243 is useless without ip_recverr and error is hard. 244 */ 245 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 246 return; 247 248 switch (type) { 249 default: 250 case ICMP_TIME_EXCEEDED: 251 err = EHOSTUNREACH; 252 break; 253 case ICMP_SOURCE_QUENCH: 254 return; 255 case ICMP_PARAMETERPROB: 256 err = EPROTO; 257 harderr = 1; 258 break; 259 case ICMP_DEST_UNREACH: 260 err = EHOSTUNREACH; 261 if (code > NR_ICMP_UNREACH) 262 break; 263 if (code == ICMP_FRAG_NEEDED) { 264 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 265 err = EMSGSIZE; 266 } else { 267 err = icmp_err_convert[code].errno; 268 harderr = icmp_err_convert[code].fatal; 269 } 270 } 271 272 if (inet->recverr) { 273 const struct iphdr *iph = (const struct iphdr *)skb->data; 274 u8 *payload = skb->data + (iph->ihl << 2); 275 276 if (inet->hdrincl) 277 payload = skb->data; 278 ip_icmp_error(sk, skb, err, 0, info, payload); 279 } 280 281 if (inet->recverr || harderr) { 282 sk->sk_err = err; 283 sk->sk_error_report(sk); 284 } 285} 286 287void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 288{ 289 int hash; 290 struct sock *raw_sk; 291 const struct iphdr *iph; 292 struct net *net; 293 294 hash = protocol & (RAW_HTABLE_SIZE - 1); 295 296 read_lock(&raw_v4_hashinfo.lock); 297 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 298 if (raw_sk) { 299 int dif = skb->dev->ifindex; 300 int sdif = inet_sdif(skb); 301 302 iph = (const struct iphdr *)skb->data; 303 net = dev_net(skb->dev); 304 305 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 306 iph->daddr, iph->saddr, 307 dif, sdif)) != NULL) { 308 raw_err(raw_sk, skb, info); 309 raw_sk = sk_next(raw_sk); 310 iph = (const struct iphdr *)skb->data; 311 } 312 } 313 read_unlock(&raw_v4_hashinfo.lock); 314} 315 316static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 317{ 318 /* Charge it to the socket. */ 319 320 ipv4_pktinfo_prepare(sk, skb); 321 if (sock_queue_rcv_skb(sk, skb) < 0) { 322 kfree_skb(skb); 323 return NET_RX_DROP; 324 } 325 326 return NET_RX_SUCCESS; 327} 328 329int raw_rcv(struct sock *sk, struct sk_buff *skb) 330{ 331 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 332 atomic_inc(&sk->sk_drops); 333 kfree_skb(skb); 334 return NET_RX_DROP; 335 } 336 nf_reset_ct(skb); 337 338 skb_push(skb, skb->data - skb_network_header(skb)); 339 340 raw_rcv_skb(sk, skb); 341 return 0; 342} 343 344static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 345 struct msghdr *msg, size_t length, 346 struct rtable **rtp, unsigned int flags, 347 const struct sockcm_cookie *sockc) 348{ 349 struct inet_sock *inet = inet_sk(sk); 350 struct net *net = sock_net(sk); 351 struct iphdr *iph; 352 struct sk_buff *skb; 353 unsigned int iphlen; 354 int err; 355 struct rtable *rt = *rtp; 356 int hlen, tlen; 357 358 if (length > rt->dst.dev->mtu) { 359 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 360 rt->dst.dev->mtu); 361 return -EMSGSIZE; 362 } 363 if (length < sizeof(struct iphdr)) 364 return -EINVAL; 365 366 if (flags&MSG_PROBE) 367 goto out; 368 369 hlen = LL_RESERVED_SPACE(rt->dst.dev); 370 tlen = rt->dst.dev->needed_tailroom; 371 skb = sock_alloc_send_skb(sk, 372 length + hlen + tlen + 15, 373 flags & MSG_DONTWAIT, &err); 374 if (!skb) 375 goto error; 376 skb_reserve(skb, hlen); 377 378 skb->priority = sk->sk_priority; 379 skb->mark = sockc->mark; 380 skb->tstamp = sockc->transmit_time; 381 skb_dst_set(skb, &rt->dst); 382 *rtp = NULL; 383 384 skb_reset_network_header(skb); 385 iph = ip_hdr(skb); 386 skb_put(skb, length); 387 388 skb->ip_summed = CHECKSUM_NONE; 389 390 skb_setup_tx_timestamp(skb, sockc->tsflags); 391 392 if (flags & MSG_CONFIRM) 393 skb_set_dst_pending_confirm(skb, 1); 394 395 skb->transport_header = skb->network_header; 396 err = -EFAULT; 397 if (memcpy_from_msg(iph, msg, length)) 398 goto error_free; 399 400 iphlen = iph->ihl * 4; 401 402 /* 403 * We don't want to modify the ip header, but we do need to 404 * be sure that it won't cause problems later along the network 405 * stack. Specifically we want to make sure that iph->ihl is a 406 * sane value. If ihl points beyond the length of the buffer passed 407 * in, reject the frame as invalid 408 */ 409 err = -EINVAL; 410 if (iphlen > length) 411 goto error_free; 412 413 if (iphlen >= sizeof(*iph)) { 414 if (!iph->saddr) 415 iph->saddr = fl4->saddr; 416 iph->check = 0; 417 iph->tot_len = htons(length); 418 if (!iph->id) 419 ip_select_ident(net, skb, NULL); 420 421 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 422 skb->transport_header += iphlen; 423 if (iph->protocol == IPPROTO_ICMP && 424 length >= iphlen + sizeof(struct icmphdr)) 425 icmp_out_count(net, ((struct icmphdr *) 426 skb_transport_header(skb))->type); 427 } 428 429 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 430 net, sk, skb, NULL, rt->dst.dev, 431 dst_output); 432 if (err > 0) 433 err = net_xmit_errno(err); 434 if (err) 435 goto error; 436out: 437 return 0; 438 439error_free: 440 kfree_skb(skb); 441error: 442 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 443 if (err == -ENOBUFS && !inet->recverr) 444 err = 0; 445 return err; 446} 447 448static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 449{ 450 int err; 451 452 if (fl4->flowi4_proto != IPPROTO_ICMP) 453 return 0; 454 455 /* We only need the first two bytes. */ 456 rfv->hlen = 2; 457 458 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 459 if (err) 460 return err; 461 462 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 463 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 464 465 return 0; 466} 467 468static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 469 struct sk_buff *skb) 470{ 471 struct raw_frag_vec *rfv = from; 472 473 if (offset < rfv->hlen) { 474 int copy = min(rfv->hlen - offset, len); 475 476 if (skb->ip_summed == CHECKSUM_PARTIAL) 477 memcpy(to, rfv->hdr.c + offset, copy); 478 else 479 skb->csum = csum_block_add( 480 skb->csum, 481 csum_partial_copy_nocheck(rfv->hdr.c + offset, 482 to, copy), 483 odd); 484 485 odd = 0; 486 offset += copy; 487 to += copy; 488 len -= copy; 489 490 if (!len) 491 return 0; 492 } 493 494 offset -= rfv->hlen; 495 496 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 497} 498 499static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 500{ 501 struct inet_sock *inet = inet_sk(sk); 502 struct net *net = sock_net(sk); 503 struct ipcm_cookie ipc; 504 struct rtable *rt = NULL; 505 struct flowi4 fl4; 506 int free = 0; 507 __be32 daddr; 508 __be32 saddr; 509 u8 tos; 510 int err; 511 struct ip_options_data opt_copy; 512 struct raw_frag_vec rfv; 513 int hdrincl; 514 515 err = -EMSGSIZE; 516 if (len > 0xFFFF) 517 goto out; 518 519 /* hdrincl should be READ_ONCE(inet->hdrincl) 520 * but READ_ONCE() doesn't work with bit fields. 521 * Doing this indirectly yields the same result. 522 */ 523 hdrincl = inet->hdrincl; 524 hdrincl = READ_ONCE(hdrincl); 525 /* 526 * Check the flags. 527 */ 528 529 err = -EOPNOTSUPP; 530 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 531 goto out; /* compatibility */ 532 533 /* 534 * Get and verify the address. 535 */ 536 537 if (msg->msg_namelen) { 538 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 539 err = -EINVAL; 540 if (msg->msg_namelen < sizeof(*usin)) 541 goto out; 542 if (usin->sin_family != AF_INET) { 543 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 544 __func__, current->comm); 545 err = -EAFNOSUPPORT; 546 if (usin->sin_family) 547 goto out; 548 } 549 daddr = usin->sin_addr.s_addr; 550 /* ANK: I did not forget to get protocol from port field. 551 * I just do not know, who uses this weirdness. 552 * IP_HDRINCL is much more convenient. 553 */ 554 } else { 555 err = -EDESTADDRREQ; 556 if (sk->sk_state != TCP_ESTABLISHED) 557 goto out; 558 daddr = inet->inet_daddr; 559 } 560 561 ipcm_init_sk(&ipc, inet); 562 /* Keep backward compat */ 563 if (hdrincl) 564 ipc.protocol = IPPROTO_RAW; 565 566 if (msg->msg_controllen) { 567 err = ip_cmsg_send(sk, msg, &ipc, false); 568 if (unlikely(err)) { 569 kfree(ipc.opt); 570 goto out; 571 } 572 if (ipc.opt) 573 free = 1; 574 } 575 576 saddr = ipc.addr; 577 ipc.addr = daddr; 578 579 if (!ipc.opt) { 580 struct ip_options_rcu *inet_opt; 581 582 rcu_read_lock(); 583 inet_opt = rcu_dereference(inet->inet_opt); 584 if (inet_opt) { 585 memcpy(&opt_copy, inet_opt, 586 sizeof(*inet_opt) + inet_opt->opt.optlen); 587 ipc.opt = &opt_copy.opt; 588 } 589 rcu_read_unlock(); 590 } 591 592 if (ipc.opt) { 593 err = -EINVAL; 594 /* Linux does not mangle headers on raw sockets, 595 * so that IP options + IP_HDRINCL is non-sense. 596 */ 597 if (hdrincl) 598 goto done; 599 if (ipc.opt->opt.srr) { 600 if (!daddr) 601 goto done; 602 daddr = ipc.opt->opt.faddr; 603 } 604 } 605 tos = get_rtconn_flags(&ipc, sk); 606 if (msg->msg_flags & MSG_DONTROUTE) 607 tos |= RTO_ONLINK; 608 609 if (ipv4_is_multicast(daddr)) { 610 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 611 ipc.oif = inet->mc_index; 612 if (!saddr) 613 saddr = inet->mc_addr; 614 } else if (!ipc.oif) { 615 ipc.oif = inet->uc_index; 616 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 617 /* oif is set, packet is to local broadcast 618 * and uc_index is set. oif is most likely set 619 * by sk_bound_dev_if. If uc_index != oif check if the 620 * oif is an L3 master and uc_index is an L3 slave. 621 * If so, we want to allow the send using the uc_index. 622 */ 623 if (ipc.oif != inet->uc_index && 624 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 625 inet->uc_index)) { 626 ipc.oif = inet->uc_index; 627 } 628 } 629 630 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, 631 RT_SCOPE_UNIVERSE, 632 hdrincl ? ipc.protocol : sk->sk_protocol, 633 inet_sk_flowi_flags(sk) | 634 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 635 daddr, saddr, 0, 0, sk->sk_uid); 636 637 if (!hdrincl) { 638 rfv.msg = msg; 639 rfv.hlen = 0; 640 641 err = raw_probe_proto_opt(&rfv, &fl4); 642 if (err) 643 goto done; 644 } 645 646 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 647 rt = ip_route_output_flow(net, &fl4, sk); 648 if (IS_ERR(rt)) { 649 err = PTR_ERR(rt); 650 rt = NULL; 651 goto done; 652 } 653 654 err = -EACCES; 655 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 656 goto done; 657 658 if (msg->msg_flags & MSG_CONFIRM) 659 goto do_confirm; 660back_from_confirm: 661 662 if (hdrincl) 663 err = raw_send_hdrinc(sk, &fl4, msg, len, 664 &rt, msg->msg_flags, &ipc.sockc); 665 666 else { 667 if (!ipc.addr) 668 ipc.addr = fl4.daddr; 669 lock_sock(sk); 670 err = ip_append_data(sk, &fl4, raw_getfrag, 671 &rfv, len, 0, 672 &ipc, &rt, msg->msg_flags); 673 if (err) 674 ip_flush_pending_frames(sk); 675 else if (!(msg->msg_flags & MSG_MORE)) { 676 err = ip_push_pending_frames(sk, &fl4); 677 if (err == -ENOBUFS && !inet->recverr) 678 err = 0; 679 } 680 release_sock(sk); 681 } 682done: 683 if (free) 684 kfree(ipc.opt); 685 ip_rt_put(rt); 686 687out: 688 if (err < 0) 689 return err; 690 return len; 691 692do_confirm: 693 if (msg->msg_flags & MSG_PROBE) 694 dst_confirm_neigh(&rt->dst, &fl4.daddr); 695 if (!(msg->msg_flags & MSG_PROBE) || len) 696 goto back_from_confirm; 697 err = 0; 698 goto done; 699} 700 701static void raw_close(struct sock *sk, long timeout) 702{ 703 /* 704 * Raw sockets may have direct kernel references. Kill them. 705 */ 706 ip_ra_control(sk, 0, NULL); 707 708 sk_common_release(sk); 709} 710 711static void raw_destroy(struct sock *sk) 712{ 713 lock_sock(sk); 714 ip_flush_pending_frames(sk); 715 release_sock(sk); 716} 717 718/* This gets rid of all the nasties in af_inet. -DaveM */ 719static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 720{ 721 struct inet_sock *inet = inet_sk(sk); 722 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 723 u32 tb_id = RT_TABLE_LOCAL; 724 int ret = -EINVAL; 725 int chk_addr_ret; 726 727 lock_sock(sk); 728 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 729 goto out; 730 731 if (sk->sk_bound_dev_if) 732 tb_id = l3mdev_fib_table_by_index(sock_net(sk), 733 sk->sk_bound_dev_if) ? : tb_id; 734 735 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 736 tb_id); 737 738 ret = -EADDRNOTAVAIL; 739 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 740 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 741 goto out; 742 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 743 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 744 inet->inet_saddr = 0; /* Use device */ 745 sk_dst_reset(sk); 746 ret = 0; 747out: 748 release_sock(sk); 749 return ret; 750} 751 752/* 753 * This should be easy, if there is something there 754 * we return it, otherwise we block. 755 */ 756 757static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 758 int noblock, int flags, int *addr_len) 759{ 760 struct inet_sock *inet = inet_sk(sk); 761 size_t copied = 0; 762 int err = -EOPNOTSUPP; 763 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 764 struct sk_buff *skb; 765 766 if (flags & MSG_OOB) 767 goto out; 768 769 if (flags & MSG_ERRQUEUE) { 770 err = ip_recv_error(sk, msg, len, addr_len); 771 goto out; 772 } 773 774 skb = skb_recv_datagram(sk, flags, noblock, &err); 775 if (!skb) 776 goto out; 777 778 copied = skb->len; 779 if (len < copied) { 780 msg->msg_flags |= MSG_TRUNC; 781 copied = len; 782 } 783 784 err = skb_copy_datagram_msg(skb, 0, msg, copied); 785 if (err) 786 goto done; 787 788 sock_recv_ts_and_drops(msg, sk, skb); 789 790 /* Copy the address. */ 791 if (sin) { 792 sin->sin_family = AF_INET; 793 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 794 sin->sin_port = 0; 795 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 796 *addr_len = sizeof(*sin); 797 } 798 if (inet->cmsg_flags) 799 ip_cmsg_recv(msg, skb); 800 if (flags & MSG_TRUNC) 801 copied = skb->len; 802done: 803 skb_free_datagram(sk, skb); 804out: 805 if (err) 806 return err; 807 return copied; 808} 809 810static int raw_sk_init(struct sock *sk) 811{ 812 struct raw_sock *rp = raw_sk(sk); 813 814 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 815 memset(&rp->filter, 0, sizeof(rp->filter)); 816 return 0; 817} 818 819static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 820{ 821 if (optlen > sizeof(struct icmp_filter)) 822 optlen = sizeof(struct icmp_filter); 823 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 824 return -EFAULT; 825 return 0; 826} 827 828static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 829{ 830 int len, ret = -EFAULT; 831 832 if (get_user(len, optlen)) 833 goto out; 834 ret = -EINVAL; 835 if (len < 0) 836 goto out; 837 if (len > sizeof(struct icmp_filter)) 838 len = sizeof(struct icmp_filter); 839 ret = -EFAULT; 840 if (put_user(len, optlen) || 841 copy_to_user(optval, &raw_sk(sk)->filter, len)) 842 goto out; 843 ret = 0; 844out: return ret; 845} 846 847static int do_raw_setsockopt(struct sock *sk, int level, int optname, 848 sockptr_t optval, unsigned int optlen) 849{ 850 if (optname == ICMP_FILTER) { 851 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 852 return -EOPNOTSUPP; 853 else 854 return raw_seticmpfilter(sk, optval, optlen); 855 } 856 return -ENOPROTOOPT; 857} 858 859static int raw_setsockopt(struct sock *sk, int level, int optname, 860 sockptr_t optval, unsigned int optlen) 861{ 862 if (level != SOL_RAW) 863 return ip_setsockopt(sk, level, optname, optval, optlen); 864 return do_raw_setsockopt(sk, level, optname, optval, optlen); 865} 866 867static int do_raw_getsockopt(struct sock *sk, int level, int optname, 868 char __user *optval, int __user *optlen) 869{ 870 if (optname == ICMP_FILTER) { 871 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 872 return -EOPNOTSUPP; 873 else 874 return raw_geticmpfilter(sk, optval, optlen); 875 } 876 return -ENOPROTOOPT; 877} 878 879static int raw_getsockopt(struct sock *sk, int level, int optname, 880 char __user *optval, int __user *optlen) 881{ 882 if (level != SOL_RAW) 883 return ip_getsockopt(sk, level, optname, optval, optlen); 884 return do_raw_getsockopt(sk, level, optname, optval, optlen); 885} 886 887static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 888{ 889 switch (cmd) { 890 case SIOCOUTQ: { 891 int amount = sk_wmem_alloc_get(sk); 892 893 return put_user(amount, (int __user *)arg); 894 } 895 case SIOCINQ: { 896 struct sk_buff *skb; 897 int amount = 0; 898 899 spin_lock_bh(&sk->sk_receive_queue.lock); 900 skb = skb_peek(&sk->sk_receive_queue); 901 if (skb) 902 amount = skb->len; 903 spin_unlock_bh(&sk->sk_receive_queue.lock); 904 return put_user(amount, (int __user *)arg); 905 } 906 907 default: 908#ifdef CONFIG_IP_MROUTE 909 return ipmr_ioctl(sk, cmd, (void __user *)arg); 910#else 911 return -ENOIOCTLCMD; 912#endif 913 } 914} 915 916#ifdef CONFIG_COMPAT 917static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 918{ 919 switch (cmd) { 920 case SIOCOUTQ: 921 case SIOCINQ: 922 return -ENOIOCTLCMD; 923 default: 924#ifdef CONFIG_IP_MROUTE 925 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 926#else 927 return -ENOIOCTLCMD; 928#endif 929 } 930} 931#endif 932 933int raw_abort(struct sock *sk, int err) 934{ 935 lock_sock(sk); 936 937 sk->sk_err = err; 938 sk->sk_error_report(sk); 939 __udp_disconnect(sk, 0); 940 941 release_sock(sk); 942 943 return 0; 944} 945EXPORT_SYMBOL_GPL(raw_abort); 946 947struct proto raw_prot = { 948 .name = "RAW", 949 .owner = THIS_MODULE, 950 .close = raw_close, 951 .destroy = raw_destroy, 952 .connect = ip4_datagram_connect, 953 .disconnect = __udp_disconnect, 954 .ioctl = raw_ioctl, 955 .init = raw_sk_init, 956 .setsockopt = raw_setsockopt, 957 .getsockopt = raw_getsockopt, 958 .sendmsg = raw_sendmsg, 959 .recvmsg = raw_recvmsg, 960 .bind = raw_bind, 961 .backlog_rcv = raw_rcv_skb, 962 .release_cb = ip4_datagram_release_cb, 963 .hash = raw_hash_sk, 964 .unhash = raw_unhash_sk, 965 .obj_size = sizeof(struct raw_sock), 966 .useroffset = offsetof(struct raw_sock, filter), 967 .usersize = sizeof_field(struct raw_sock, filter), 968 .h.raw_hash = &raw_v4_hashinfo, 969#ifdef CONFIG_COMPAT 970 .compat_ioctl = compat_raw_ioctl, 971#endif 972 .diag_destroy = raw_abort, 973}; 974 975#ifdef CONFIG_PROC_FS 976static struct sock *raw_get_first(struct seq_file *seq) 977{ 978 struct sock *sk; 979 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 980 struct raw_iter_state *state = raw_seq_private(seq); 981 982 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 983 ++state->bucket) { 984 sk_for_each(sk, &h->ht[state->bucket]) 985 if (sock_net(sk) == seq_file_net(seq)) 986 goto found; 987 } 988 sk = NULL; 989found: 990 return sk; 991} 992 993static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 994{ 995 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 996 struct raw_iter_state *state = raw_seq_private(seq); 997 998 do { 999 sk = sk_next(sk); 1000try_again: 1001 ; 1002 } while (sk && sock_net(sk) != seq_file_net(seq)); 1003 1004 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 1005 sk = sk_head(&h->ht[state->bucket]); 1006 goto try_again; 1007 } 1008 return sk; 1009} 1010 1011static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1012{ 1013 struct sock *sk = raw_get_first(seq); 1014 1015 if (sk) 1016 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1017 --pos; 1018 return pos ? NULL : sk; 1019} 1020 1021void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1022 __acquires(&h->lock) 1023{ 1024 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1025 1026 read_lock(&h->lock); 1027 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1028} 1029EXPORT_SYMBOL_GPL(raw_seq_start); 1030 1031void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1032{ 1033 struct sock *sk; 1034 1035 if (v == SEQ_START_TOKEN) 1036 sk = raw_get_first(seq); 1037 else 1038 sk = raw_get_next(seq, v); 1039 ++*pos; 1040 return sk; 1041} 1042EXPORT_SYMBOL_GPL(raw_seq_next); 1043 1044void raw_seq_stop(struct seq_file *seq, void *v) 1045 __releases(&h->lock) 1046{ 1047 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1048 1049 read_unlock(&h->lock); 1050} 1051EXPORT_SYMBOL_GPL(raw_seq_stop); 1052 1053static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1054{ 1055 struct inet_sock *inet = inet_sk(sp); 1056 __be32 dest = inet->inet_daddr, 1057 src = inet->inet_rcv_saddr; 1058 __u16 destp = 0, 1059 srcp = inet->inet_num; 1060 1061 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1062 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1063 i, src, srcp, dest, destp, sp->sk_state, 1064 sk_wmem_alloc_get(sp), 1065 sk_rmem_alloc_get(sp), 1066 0, 0L, 0, 1067 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1068 0, sock_i_ino(sp), 1069 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1070} 1071 1072static int raw_seq_show(struct seq_file *seq, void *v) 1073{ 1074 if (v == SEQ_START_TOKEN) 1075 seq_printf(seq, " sl local_address rem_address st tx_queue " 1076 "rx_queue tr tm->when retrnsmt uid timeout " 1077 "inode ref pointer drops\n"); 1078 else 1079 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1080 return 0; 1081} 1082 1083static const struct seq_operations raw_seq_ops = { 1084 .start = raw_seq_start, 1085 .next = raw_seq_next, 1086 .stop = raw_seq_stop, 1087 .show = raw_seq_show, 1088}; 1089 1090static __net_init int raw_init_net(struct net *net) 1091{ 1092 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1093 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1094 return -ENOMEM; 1095 1096 return 0; 1097} 1098 1099static __net_exit void raw_exit_net(struct net *net) 1100{ 1101 remove_proc_entry("raw", net->proc_net); 1102} 1103 1104static __net_initdata struct pernet_operations raw_net_ops = { 1105 .init = raw_init_net, 1106 .exit = raw_exit_net, 1107}; 1108 1109int __init raw_proc_init(void) 1110{ 1111 return register_pernet_subsys(&raw_net_ops); 1112} 1113 1114void __init raw_proc_exit(void) 1115{ 1116 unregister_pernet_subsys(&raw_net_ops); 1117} 1118#endif /* CONFIG_PROC_FS */ 1119 1120static void raw_sysctl_init_net(struct net *net) 1121{ 1122#ifdef CONFIG_NET_L3_MASTER_DEV 1123 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1124#endif 1125} 1126 1127static int __net_init raw_sysctl_init(struct net *net) 1128{ 1129 raw_sysctl_init_net(net); 1130 return 0; 1131} 1132 1133static struct pernet_operations __net_initdata raw_sysctl_ops = { 1134 .init = raw_sysctl_init, 1135}; 1136 1137void __init raw_init(void) 1138{ 1139 raw_sysctl_init_net(&init_net); 1140 if (register_pernet_subsys(&raw_sysctl_ops)) 1141 panic("RAW: failed to init sysctl parameters.\n"); 1142} 1143