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 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 90 }; 91 EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 92 93 int 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 } 107 EXPORT_SYMBOL_GPL(raw_hash_sk); 108 109 void 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 } 118 EXPORT_SYMBOL_GPL(raw_unhash_sk); 119 120 struct 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; 134 found: 135 return sk; 136 } 137 EXPORT_SYMBOL_GPL(__raw_v4_lookup); 138 139 /* 140 * 0 - deliver 141 * 1 - block 142 */ 143 static 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 */ 169 static 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 } 202 out: 203 read_unlock(&raw_v4_hashinfo.lock); 204 return delivered; 205 } 206 207 int 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 } 224 225 static 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 err = icmp_err_convert[code].errno; 264 harderr = icmp_err_convert[code].fatal; 265 if (code == ICMP_FRAG_NEEDED) { 266 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 267 err = EMSGSIZE; 268 } 269 } 270 271 if (inet->recverr) { 272 const struct iphdr *iph = (const struct iphdr *)skb->data; 273 u8 *payload = skb->data + (iph->ihl << 2); 274 275 if (inet->hdrincl) 276 payload = skb->data; 277 ip_icmp_error(sk, skb, err, 0, info, payload); 278 } 279 280 if (inet->recverr || harderr) { 281 sk->sk_err = err; 282 sk->sk_error_report(sk); 283 } 284 } 285 286 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 287 { 288 int hash; 289 struct sock *raw_sk; 290 const struct iphdr *iph; 291 struct net *net; 292 293 hash = protocol & (RAW_HTABLE_SIZE - 1); 294 295 read_lock(&raw_v4_hashinfo.lock); 296 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 297 if (raw_sk) { 298 int dif = skb->dev->ifindex; 299 int sdif = inet_sdif(skb); 300 301 iph = (const struct iphdr *)skb->data; 302 net = dev_net(skb->dev); 303 304 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 305 iph->daddr, iph->saddr, 306 dif, sdif)) != NULL) { 307 raw_err(raw_sk, skb, info); 308 raw_sk = sk_next(raw_sk); 309 iph = (const struct iphdr *)skb->data; 310 } 311 } 312 read_unlock(&raw_v4_hashinfo.lock); 313 } 314 315 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 316 { 317 /* Charge it to the socket. */ 318 319 ipv4_pktinfo_prepare(sk, skb); 320 if (sock_queue_rcv_skb(sk, skb) < 0) { 321 kfree_skb(skb); 322 return NET_RX_DROP; 323 } 324 325 return NET_RX_SUCCESS; 326 } 327 328 int raw_rcv(struct sock *sk, struct sk_buff *skb) 329 { 330 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 331 atomic_inc(&sk->sk_drops); 332 kfree_skb(skb); 333 return NET_RX_DROP; 334 } 335 nf_reset_ct(skb); 336 337 skb_push(skb, skb->data - skb_network_header(skb)); 338 339 raw_rcv_skb(sk, skb); 340 return 0; 341 } 342 343 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 344 struct msghdr *msg, size_t length, 345 struct rtable **rtp, unsigned int flags, 346 const struct sockcm_cookie *sockc) 347 { 348 struct inet_sock *inet = inet_sk(sk); 349 struct net *net = sock_net(sk); 350 struct iphdr *iph; 351 struct sk_buff *skb; 352 unsigned int iphlen; 353 int err; 354 struct rtable *rt = *rtp; 355 int hlen, tlen; 356 357 if (length > rt->dst.dev->mtu) { 358 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 359 rt->dst.dev->mtu); 360 return -EMSGSIZE; 361 } 362 if (length < sizeof(struct iphdr)) 363 return -EINVAL; 364 365 if (flags&MSG_PROBE) 366 goto out; 367 368 hlen = LL_RESERVED_SPACE(rt->dst.dev); 369 tlen = rt->dst.dev->needed_tailroom; 370 skb = sock_alloc_send_skb(sk, 371 length + hlen + tlen + 15, 372 flags & MSG_DONTWAIT, &err); 373 if (!skb) 374 goto error; 375 skb_reserve(skb, hlen); 376 377 skb->priority = sk->sk_priority; 378 skb->mark = sockc->mark; 379 skb->tstamp = sockc->transmit_time; 380 skb_dst_set(skb, &rt->dst); 381 *rtp = NULL; 382 383 skb_reset_network_header(skb); 384 iph = ip_hdr(skb); 385 skb_put(skb, length); 386 387 skb->ip_summed = CHECKSUM_NONE; 388 389 skb_setup_tx_timestamp(skb, sockc->tsflags); 390 391 if (flags & MSG_CONFIRM) 392 skb_set_dst_pending_confirm(skb, 1); 393 394 skb->transport_header = skb->network_header; 395 err = -EFAULT; 396 if (memcpy_from_msg(iph, msg, length)) 397 goto error_free; 398 399 iphlen = iph->ihl * 4; 400 401 /* 402 * We don't want to modify the ip header, but we do need to 403 * be sure that it won't cause problems later along the network 404 * stack. Specifically we want to make sure that iph->ihl is a 405 * sane value. If ihl points beyond the length of the buffer passed 406 * in, reject the frame as invalid 407 */ 408 err = -EINVAL; 409 if (iphlen > length) 410 goto error_free; 411 412 if (iphlen >= sizeof(*iph)) { 413 if (!iph->saddr) 414 iph->saddr = fl4->saddr; 415 iph->check = 0; 416 iph->tot_len = htons(length); 417 if (!iph->id) 418 ip_select_ident(net, skb, NULL); 419 420 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 421 skb->transport_header += iphlen; 422 if (iph->protocol == IPPROTO_ICMP && 423 length >= iphlen + sizeof(struct icmphdr)) 424 icmp_out_count(net, ((struct icmphdr *) 425 skb_transport_header(skb))->type); 426 } 427 428 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 429 net, sk, skb, NULL, rt->dst.dev, 430 dst_output); 431 if (err > 0) 432 err = net_xmit_errno(err); 433 if (err) 434 goto error; 435 out: 436 return 0; 437 438 error_free: 439 kfree_skb(skb); 440 error: 441 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 442 if (err == -ENOBUFS && !inet->recverr) 443 err = 0; 444 return err; 445 } 446 447 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 448 { 449 int err; 450 451 if (fl4->flowi4_proto != IPPROTO_ICMP) 452 return 0; 453 454 /* We only need the first two bytes. */ 455 rfv->hlen = 2; 456 457 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 458 if (err) 459 return err; 460 461 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 462 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 463 464 return 0; 465 } 466 467 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 468 struct sk_buff *skb) 469 { 470 struct raw_frag_vec *rfv = from; 471 472 if (offset < rfv->hlen) { 473 int copy = min(rfv->hlen - offset, len); 474 475 if (skb->ip_summed == CHECKSUM_PARTIAL) 476 memcpy(to, rfv->hdr.c + offset, copy); 477 else 478 skb->csum = csum_block_add( 479 skb->csum, 480 csum_partial_copy_nocheck(rfv->hdr.c + offset, 481 to, copy, 0), 482 odd); 483 484 odd = 0; 485 offset += copy; 486 to += copy; 487 len -= copy; 488 489 if (!len) 490 return 0; 491 } 492 493 offset -= rfv->hlen; 494 495 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 496 } 497 498 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 499 { 500 struct inet_sock *inet = inet_sk(sk); 501 struct net *net = sock_net(sk); 502 struct ipcm_cookie ipc; 503 struct rtable *rt = NULL; 504 struct flowi4 fl4; 505 int free = 0; 506 __be32 daddr; 507 __be32 saddr; 508 u8 tos; 509 int err; 510 struct ip_options_data opt_copy; 511 struct raw_frag_vec rfv; 512 int hdrincl; 513 514 err = -EMSGSIZE; 515 if (len > 0xFFFF) 516 goto out; 517 518 /* hdrincl should be READ_ONCE(inet->hdrincl) 519 * but READ_ONCE() doesn't work with bit fields. 520 * Doing this indirectly yields the same result. 521 */ 522 hdrincl = inet->hdrincl; 523 hdrincl = READ_ONCE(hdrincl); 524 /* 525 * Check the flags. 526 */ 527 528 err = -EOPNOTSUPP; 529 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 530 goto out; /* compatibility */ 531 532 /* 533 * Get and verify the address. 534 */ 535 536 if (msg->msg_namelen) { 537 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 538 err = -EINVAL; 539 if (msg->msg_namelen < sizeof(*usin)) 540 goto out; 541 if (usin->sin_family != AF_INET) { 542 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 543 __func__, current->comm); 544 err = -EAFNOSUPPORT; 545 if (usin->sin_family) 546 goto out; 547 } 548 daddr = usin->sin_addr.s_addr; 549 /* ANK: I did not forget to get protocol from port field. 550 * I just do not know, who uses this weirdness. 551 * IP_HDRINCL is much more convenient. 552 */ 553 } else { 554 err = -EDESTADDRREQ; 555 if (sk->sk_state != TCP_ESTABLISHED) 556 goto out; 557 daddr = inet->inet_daddr; 558 } 559 560 ipcm_init_sk(&ipc, inet); 561 562 if (msg->msg_controllen) { 563 err = ip_cmsg_send(sk, msg, &ipc, false); 564 if (unlikely(err)) { 565 kfree(ipc.opt); 566 goto out; 567 } 568 if (ipc.opt) 569 free = 1; 570 } 571 572 saddr = ipc.addr; 573 ipc.addr = daddr; 574 575 if (!ipc.opt) { 576 struct ip_options_rcu *inet_opt; 577 578 rcu_read_lock(); 579 inet_opt = rcu_dereference(inet->inet_opt); 580 if (inet_opt) { 581 memcpy(&opt_copy, inet_opt, 582 sizeof(*inet_opt) + inet_opt->opt.optlen); 583 ipc.opt = &opt_copy.opt; 584 } 585 rcu_read_unlock(); 586 } 587 588 if (ipc.opt) { 589 err = -EINVAL; 590 /* Linux does not mangle headers on raw sockets, 591 * so that IP options + IP_HDRINCL is non-sense. 592 */ 593 if (hdrincl) 594 goto done; 595 if (ipc.opt->opt.srr) { 596 if (!daddr) 597 goto done; 598 daddr = ipc.opt->opt.faddr; 599 } 600 } 601 tos = get_rtconn_flags(&ipc, sk); 602 if (msg->msg_flags & MSG_DONTROUTE) 603 tos |= RTO_ONLINK; 604 605 if (ipv4_is_multicast(daddr)) { 606 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 607 ipc.oif = inet->mc_index; 608 if (!saddr) 609 saddr = inet->mc_addr; 610 } else if (!ipc.oif) { 611 ipc.oif = inet->uc_index; 612 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 613 /* oif is set, packet is to local broadcast and 614 * and uc_index is set. oif is most likely set 615 * by sk_bound_dev_if. If uc_index != oif check if the 616 * oif is an L3 master and uc_index is an L3 slave. 617 * If so, we want to allow the send using the uc_index. 618 */ 619 if (ipc.oif != inet->uc_index && 620 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 621 inet->uc_index)) { 622 ipc.oif = inet->uc_index; 623 } 624 } 625 626 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, 627 RT_SCOPE_UNIVERSE, 628 hdrincl ? IPPROTO_RAW : sk->sk_protocol, 629 inet_sk_flowi_flags(sk) | 630 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 631 daddr, saddr, 0, 0, sk->sk_uid); 632 633 if (!hdrincl) { 634 rfv.msg = msg; 635 rfv.hlen = 0; 636 637 err = raw_probe_proto_opt(&rfv, &fl4); 638 if (err) 639 goto done; 640 } 641 642 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); 643 rt = ip_route_output_flow(net, &fl4, sk); 644 if (IS_ERR(rt)) { 645 err = PTR_ERR(rt); 646 rt = NULL; 647 goto done; 648 } 649 650 err = -EACCES; 651 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 652 goto done; 653 654 if (msg->msg_flags & MSG_CONFIRM) 655 goto do_confirm; 656 back_from_confirm: 657 658 if (hdrincl) 659 err = raw_send_hdrinc(sk, &fl4, msg, len, 660 &rt, msg->msg_flags, &ipc.sockc); 661 662 else { 663 if (!ipc.addr) 664 ipc.addr = fl4.daddr; 665 lock_sock(sk); 666 err = ip_append_data(sk, &fl4, raw_getfrag, 667 &rfv, len, 0, 668 &ipc, &rt, msg->msg_flags); 669 if (err) 670 ip_flush_pending_frames(sk); 671 else if (!(msg->msg_flags & MSG_MORE)) { 672 err = ip_push_pending_frames(sk, &fl4); 673 if (err == -ENOBUFS && !inet->recverr) 674 err = 0; 675 } 676 release_sock(sk); 677 } 678 done: 679 if (free) 680 kfree(ipc.opt); 681 ip_rt_put(rt); 682 683 out: 684 if (err < 0) 685 return err; 686 return len; 687 688 do_confirm: 689 if (msg->msg_flags & MSG_PROBE) 690 dst_confirm_neigh(&rt->dst, &fl4.daddr); 691 if (!(msg->msg_flags & MSG_PROBE) || len) 692 goto back_from_confirm; 693 err = 0; 694 goto done; 695 } 696 697 static void raw_close(struct sock *sk, long timeout) 698 { 699 /* 700 * Raw sockets may have direct kernel references. Kill them. 701 */ 702 ip_ra_control(sk, 0, NULL); 703 704 sk_common_release(sk); 705 } 706 707 static void raw_destroy(struct sock *sk) 708 { 709 lock_sock(sk); 710 ip_flush_pending_frames(sk); 711 release_sock(sk); 712 } 713 714 /* This gets rid of all the nasties in af_inet. -DaveM */ 715 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 716 { 717 struct inet_sock *inet = inet_sk(sk); 718 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 719 u32 tb_id = RT_TABLE_LOCAL; 720 int ret = -EINVAL; 721 int chk_addr_ret; 722 723 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 724 goto out; 725 726 if (sk->sk_bound_dev_if) 727 tb_id = l3mdev_fib_table_by_index(sock_net(sk), 728 sk->sk_bound_dev_if) ? : tb_id; 729 730 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 731 tb_id); 732 733 ret = -EADDRNOTAVAIL; 734 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 735 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 736 goto out; 737 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 738 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 739 inet->inet_saddr = 0; /* Use device */ 740 sk_dst_reset(sk); 741 ret = 0; 742 out: return ret; 743 } 744 745 /* 746 * This should be easy, if there is something there 747 * we return it, otherwise we block. 748 */ 749 750 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 751 int noblock, int flags, int *addr_len) 752 { 753 struct inet_sock *inet = inet_sk(sk); 754 size_t copied = 0; 755 int err = -EOPNOTSUPP; 756 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 757 struct sk_buff *skb; 758 759 if (flags & MSG_OOB) 760 goto out; 761 762 if (flags & MSG_ERRQUEUE) { 763 err = ip_recv_error(sk, msg, len, addr_len); 764 goto out; 765 } 766 767 skb = skb_recv_datagram(sk, flags, noblock, &err); 768 if (!skb) 769 goto out; 770 771 copied = skb->len; 772 if (len < copied) { 773 msg->msg_flags |= MSG_TRUNC; 774 copied = len; 775 } 776 777 err = skb_copy_datagram_msg(skb, 0, msg, copied); 778 if (err) 779 goto done; 780 781 sock_recv_ts_and_drops(msg, sk, skb); 782 783 /* Copy the address. */ 784 if (sin) { 785 sin->sin_family = AF_INET; 786 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 787 sin->sin_port = 0; 788 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 789 *addr_len = sizeof(*sin); 790 } 791 if (inet->cmsg_flags) 792 ip_cmsg_recv(msg, skb); 793 if (flags & MSG_TRUNC) 794 copied = skb->len; 795 done: 796 skb_free_datagram(sk, skb); 797 out: 798 if (err) 799 return err; 800 return copied; 801 } 802 803 static int raw_sk_init(struct sock *sk) 804 { 805 struct raw_sock *rp = raw_sk(sk); 806 807 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 808 memset(&rp->filter, 0, sizeof(rp->filter)); 809 return 0; 810 } 811 812 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 813 { 814 if (optlen > sizeof(struct icmp_filter)) 815 optlen = sizeof(struct icmp_filter); 816 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 817 return -EFAULT; 818 return 0; 819 } 820 821 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 822 { 823 int len, ret = -EFAULT; 824 825 if (get_user(len, optlen)) 826 goto out; 827 ret = -EINVAL; 828 if (len < 0) 829 goto out; 830 if (len > sizeof(struct icmp_filter)) 831 len = sizeof(struct icmp_filter); 832 ret = -EFAULT; 833 if (put_user(len, optlen) || 834 copy_to_user(optval, &raw_sk(sk)->filter, len)) 835 goto out; 836 ret = 0; 837 out: return ret; 838 } 839 840 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 841 char __user *optval, unsigned int optlen) 842 { 843 if (optname == ICMP_FILTER) { 844 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 845 return -EOPNOTSUPP; 846 else 847 return raw_seticmpfilter(sk, optval, optlen); 848 } 849 return -ENOPROTOOPT; 850 } 851 852 static int raw_setsockopt(struct sock *sk, int level, int optname, 853 char __user *optval, unsigned int optlen) 854 { 855 if (level != SOL_RAW) 856 return ip_setsockopt(sk, level, optname, optval, optlen); 857 return do_raw_setsockopt(sk, level, optname, optval, optlen); 858 } 859 860 #ifdef CONFIG_COMPAT 861 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 862 char __user *optval, unsigned int optlen) 863 { 864 if (level != SOL_RAW) 865 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 866 return do_raw_setsockopt(sk, level, optname, optval, optlen); 867 } 868 #endif 869 870 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 871 char __user *optval, int __user *optlen) 872 { 873 if (optname == ICMP_FILTER) { 874 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 875 return -EOPNOTSUPP; 876 else 877 return raw_geticmpfilter(sk, optval, optlen); 878 } 879 return -ENOPROTOOPT; 880 } 881 882 static int raw_getsockopt(struct sock *sk, int level, int optname, 883 char __user *optval, int __user *optlen) 884 { 885 if (level != SOL_RAW) 886 return ip_getsockopt(sk, level, optname, optval, optlen); 887 return do_raw_getsockopt(sk, level, optname, optval, optlen); 888 } 889 890 #ifdef CONFIG_COMPAT 891 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 892 char __user *optval, int __user *optlen) 893 { 894 if (level != SOL_RAW) 895 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 896 return do_raw_getsockopt(sk, level, optname, optval, optlen); 897 } 898 #endif 899 900 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 901 { 902 switch (cmd) { 903 case SIOCOUTQ: { 904 int amount = sk_wmem_alloc_get(sk); 905 906 return put_user(amount, (int __user *)arg); 907 } 908 case SIOCINQ: { 909 struct sk_buff *skb; 910 int amount = 0; 911 912 spin_lock_bh(&sk->sk_receive_queue.lock); 913 skb = skb_peek(&sk->sk_receive_queue); 914 if (skb) 915 amount = skb->len; 916 spin_unlock_bh(&sk->sk_receive_queue.lock); 917 return put_user(amount, (int __user *)arg); 918 } 919 920 default: 921 #ifdef CONFIG_IP_MROUTE 922 return ipmr_ioctl(sk, cmd, (void __user *)arg); 923 #else 924 return -ENOIOCTLCMD; 925 #endif 926 } 927 } 928 929 #ifdef CONFIG_COMPAT 930 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 931 { 932 switch (cmd) { 933 case SIOCOUTQ: 934 case SIOCINQ: 935 return -ENOIOCTLCMD; 936 default: 937 #ifdef CONFIG_IP_MROUTE 938 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 939 #else 940 return -ENOIOCTLCMD; 941 #endif 942 } 943 } 944 #endif 945 946 int raw_abort(struct sock *sk, int err) 947 { 948 lock_sock(sk); 949 950 sk->sk_err = err; 951 sk->sk_error_report(sk); 952 __udp_disconnect(sk, 0); 953 954 release_sock(sk); 955 956 return 0; 957 } 958 EXPORT_SYMBOL_GPL(raw_abort); 959 960 struct proto raw_prot = { 961 .name = "RAW", 962 .owner = THIS_MODULE, 963 .close = raw_close, 964 .destroy = raw_destroy, 965 .connect = ip4_datagram_connect, 966 .disconnect = __udp_disconnect, 967 .ioctl = raw_ioctl, 968 .init = raw_sk_init, 969 .setsockopt = raw_setsockopt, 970 .getsockopt = raw_getsockopt, 971 .sendmsg = raw_sendmsg, 972 .recvmsg = raw_recvmsg, 973 .bind = raw_bind, 974 .backlog_rcv = raw_rcv_skb, 975 .release_cb = ip4_datagram_release_cb, 976 .hash = raw_hash_sk, 977 .unhash = raw_unhash_sk, 978 .obj_size = sizeof(struct raw_sock), 979 .useroffset = offsetof(struct raw_sock, filter), 980 .usersize = sizeof_field(struct raw_sock, filter), 981 .h.raw_hash = &raw_v4_hashinfo, 982 #ifdef CONFIG_COMPAT 983 .compat_setsockopt = compat_raw_setsockopt, 984 .compat_getsockopt = compat_raw_getsockopt, 985 .compat_ioctl = compat_raw_ioctl, 986 #endif 987 .diag_destroy = raw_abort, 988 }; 989 990 #ifdef CONFIG_PROC_FS 991 static struct sock *raw_get_first(struct seq_file *seq) 992 { 993 struct sock *sk; 994 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 995 struct raw_iter_state *state = raw_seq_private(seq); 996 997 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 998 ++state->bucket) { 999 sk_for_each(sk, &h->ht[state->bucket]) 1000 if (sock_net(sk) == seq_file_net(seq)) 1001 goto found; 1002 } 1003 sk = NULL; 1004 found: 1005 return sk; 1006 } 1007 1008 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 1009 { 1010 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1011 struct raw_iter_state *state = raw_seq_private(seq); 1012 1013 do { 1014 sk = sk_next(sk); 1015 try_again: 1016 ; 1017 } while (sk && sock_net(sk) != seq_file_net(seq)); 1018 1019 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 1020 sk = sk_head(&h->ht[state->bucket]); 1021 goto try_again; 1022 } 1023 return sk; 1024 } 1025 1026 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1027 { 1028 struct sock *sk = raw_get_first(seq); 1029 1030 if (sk) 1031 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1032 --pos; 1033 return pos ? NULL : sk; 1034 } 1035 1036 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1037 { 1038 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1039 1040 read_lock(&h->lock); 1041 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1042 } 1043 EXPORT_SYMBOL_GPL(raw_seq_start); 1044 1045 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1046 { 1047 struct sock *sk; 1048 1049 if (v == SEQ_START_TOKEN) 1050 sk = raw_get_first(seq); 1051 else 1052 sk = raw_get_next(seq, v); 1053 ++*pos; 1054 return sk; 1055 } 1056 EXPORT_SYMBOL_GPL(raw_seq_next); 1057 1058 void raw_seq_stop(struct seq_file *seq, void *v) 1059 { 1060 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1061 1062 read_unlock(&h->lock); 1063 } 1064 EXPORT_SYMBOL_GPL(raw_seq_stop); 1065 1066 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1067 { 1068 struct inet_sock *inet = inet_sk(sp); 1069 __be32 dest = inet->inet_daddr, 1070 src = inet->inet_rcv_saddr; 1071 __u16 destp = 0, 1072 srcp = inet->inet_num; 1073 1074 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1075 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1076 i, src, srcp, dest, destp, sp->sk_state, 1077 sk_wmem_alloc_get(sp), 1078 sk_rmem_alloc_get(sp), 1079 0, 0L, 0, 1080 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1081 0, sock_i_ino(sp), 1082 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1083 } 1084 1085 static int raw_seq_show(struct seq_file *seq, void *v) 1086 { 1087 if (v == SEQ_START_TOKEN) 1088 seq_printf(seq, " sl local_address rem_address st tx_queue " 1089 "rx_queue tr tm->when retrnsmt uid timeout " 1090 "inode ref pointer drops\n"); 1091 else 1092 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1093 return 0; 1094 } 1095 1096 static const struct seq_operations raw_seq_ops = { 1097 .start = raw_seq_start, 1098 .next = raw_seq_next, 1099 .stop = raw_seq_stop, 1100 .show = raw_seq_show, 1101 }; 1102 1103 static __net_init int raw_init_net(struct net *net) 1104 { 1105 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1106 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1107 return -ENOMEM; 1108 1109 return 0; 1110 } 1111 1112 static __net_exit void raw_exit_net(struct net *net) 1113 { 1114 remove_proc_entry("raw", net->proc_net); 1115 } 1116 1117 static __net_initdata struct pernet_operations raw_net_ops = { 1118 .init = raw_init_net, 1119 .exit = raw_exit_net, 1120 }; 1121 1122 int __init raw_proc_init(void) 1123 { 1124 return register_pernet_subsys(&raw_net_ops); 1125 } 1126 1127 void __init raw_proc_exit(void) 1128 { 1129 unregister_pernet_subsys(&raw_net_ops); 1130 } 1131 #endif /* CONFIG_PROC_FS */ 1132 1133 static void raw_sysctl_init_net(struct net *net) 1134 { 1135 #ifdef CONFIG_NET_L3_MASTER_DEV 1136 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1137 #endif 1138 } 1139 1140 static int __net_init raw_sysctl_init(struct net *net) 1141 { 1142 raw_sysctl_init_net(net); 1143 return 0; 1144 } 1145 1146 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1147 .init = raw_sysctl_init, 1148 }; 1149 1150 void __init raw_init(void) 1151 { 1152 raw_sysctl_init_net(&init_net); 1153 if (register_pernet_subsys(&raw_sysctl_ops)) 1154 panic("RAW: failed to init sysctl parameters.\n"); 1155 } 1156