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 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 } 286 287 void 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 } 315 316 static 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 } 328 329 int 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 } 343 344 static 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; 436 out: 437 return 0; 438 439 error_free: 440 kfree_skb(skb); 441 error: 442 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 443 if (err == -ENOBUFS && !inet->recverr) 444 err = 0; 445 return err; 446 } 447 448 static 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 } 467 468 static 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 } 498 499 static 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); 562 563 if (msg->msg_controllen) { 564 err = ip_cmsg_send(sk, msg, &ipc, false); 565 if (unlikely(err)) { 566 kfree(ipc.opt); 567 goto out; 568 } 569 if (ipc.opt) 570 free = 1; 571 } 572 573 saddr = ipc.addr; 574 ipc.addr = daddr; 575 576 if (!ipc.opt) { 577 struct ip_options_rcu *inet_opt; 578 579 rcu_read_lock(); 580 inet_opt = rcu_dereference(inet->inet_opt); 581 if (inet_opt) { 582 memcpy(&opt_copy, inet_opt, 583 sizeof(*inet_opt) + inet_opt->opt.optlen); 584 ipc.opt = &opt_copy.opt; 585 } 586 rcu_read_unlock(); 587 } 588 589 if (ipc.opt) { 590 err = -EINVAL; 591 /* Linux does not mangle headers on raw sockets, 592 * so that IP options + IP_HDRINCL is non-sense. 593 */ 594 if (hdrincl) 595 goto done; 596 if (ipc.opt->opt.srr) { 597 if (!daddr) 598 goto done; 599 daddr = ipc.opt->opt.faddr; 600 } 601 } 602 tos = get_rtconn_flags(&ipc, sk); 603 if (msg->msg_flags & MSG_DONTROUTE) 604 tos |= RTO_ONLINK; 605 606 if (ipv4_is_multicast(daddr)) { 607 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 608 ipc.oif = inet->mc_index; 609 if (!saddr) 610 saddr = inet->mc_addr; 611 } else if (!ipc.oif) { 612 ipc.oif = inet->uc_index; 613 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) { 614 /* oif is set, packet is to local broadcast 615 * and uc_index is set. oif is most likely set 616 * by sk_bound_dev_if. If uc_index != oif check if the 617 * oif is an L3 master and uc_index is an L3 slave. 618 * If so, we want to allow the send using the uc_index. 619 */ 620 if (ipc.oif != inet->uc_index && 621 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 622 inet->uc_index)) { 623 ipc.oif = inet->uc_index; 624 } 625 } 626 627 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos, 628 RT_SCOPE_UNIVERSE, 629 hdrincl ? IPPROTO_RAW : sk->sk_protocol, 630 inet_sk_flowi_flags(sk) | 631 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 632 daddr, saddr, 0, 0, sk->sk_uid); 633 634 if (!hdrincl) { 635 rfv.msg = msg; 636 rfv.hlen = 0; 637 638 err = raw_probe_proto_opt(&rfv, &fl4); 639 if (err) 640 goto done; 641 } 642 643 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 644 rt = ip_route_output_flow(net, &fl4, sk); 645 if (IS_ERR(rt)) { 646 err = PTR_ERR(rt); 647 rt = NULL; 648 goto done; 649 } 650 651 err = -EACCES; 652 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 653 goto done; 654 655 if (msg->msg_flags & MSG_CONFIRM) 656 goto do_confirm; 657 back_from_confirm: 658 659 if (hdrincl) 660 err = raw_send_hdrinc(sk, &fl4, msg, len, 661 &rt, msg->msg_flags, &ipc.sockc); 662 663 else { 664 if (!ipc.addr) 665 ipc.addr = fl4.daddr; 666 lock_sock(sk); 667 err = ip_append_data(sk, &fl4, raw_getfrag, 668 &rfv, len, 0, 669 &ipc, &rt, msg->msg_flags); 670 if (err) 671 ip_flush_pending_frames(sk); 672 else if (!(msg->msg_flags & MSG_MORE)) { 673 err = ip_push_pending_frames(sk, &fl4); 674 if (err == -ENOBUFS && !inet->recverr) 675 err = 0; 676 } 677 release_sock(sk); 678 } 679 done: 680 if (free) 681 kfree(ipc.opt); 682 ip_rt_put(rt); 683 684 out: 685 if (err < 0) 686 return err; 687 return len; 688 689 do_confirm: 690 if (msg->msg_flags & MSG_PROBE) 691 dst_confirm_neigh(&rt->dst, &fl4.daddr); 692 if (!(msg->msg_flags & MSG_PROBE) || len) 693 goto back_from_confirm; 694 err = 0; 695 goto done; 696 } 697 698 static void raw_close(struct sock *sk, long timeout) 699 { 700 /* 701 * Raw sockets may have direct kernel references. Kill them. 702 */ 703 ip_ra_control(sk, 0, NULL); 704 705 sk_common_release(sk); 706 } 707 708 static void raw_destroy(struct sock *sk) 709 { 710 lock_sock(sk); 711 ip_flush_pending_frames(sk); 712 release_sock(sk); 713 } 714 715 /* This gets rid of all the nasties in af_inet. -DaveM */ 716 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 717 { 718 struct inet_sock *inet = inet_sk(sk); 719 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 720 u32 tb_id = RT_TABLE_LOCAL; 721 int ret = -EINVAL; 722 int chk_addr_ret; 723 724 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 725 goto out; 726 727 if (sk->sk_bound_dev_if) 728 tb_id = l3mdev_fib_table_by_index(sock_net(sk), 729 sk->sk_bound_dev_if) ? : tb_id; 730 731 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 732 tb_id); 733 734 ret = -EADDRNOTAVAIL; 735 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 736 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 737 goto out; 738 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 739 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 740 inet->inet_saddr = 0; /* Use device */ 741 sk_dst_reset(sk); 742 ret = 0; 743 out: return ret; 744 } 745 746 /* 747 * This should be easy, if there is something there 748 * we return it, otherwise we block. 749 */ 750 751 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 752 int noblock, int flags, int *addr_len) 753 { 754 struct inet_sock *inet = inet_sk(sk); 755 size_t copied = 0; 756 int err = -EOPNOTSUPP; 757 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 758 struct sk_buff *skb; 759 760 if (flags & MSG_OOB) 761 goto out; 762 763 if (flags & MSG_ERRQUEUE) { 764 err = ip_recv_error(sk, msg, len, addr_len); 765 goto out; 766 } 767 768 skb = skb_recv_datagram(sk, flags, noblock, &err); 769 if (!skb) 770 goto out; 771 772 copied = skb->len; 773 if (len < copied) { 774 msg->msg_flags |= MSG_TRUNC; 775 copied = len; 776 } 777 778 err = skb_copy_datagram_msg(skb, 0, msg, copied); 779 if (err) 780 goto done; 781 782 sock_recv_ts_and_drops(msg, sk, skb); 783 784 /* Copy the address. */ 785 if (sin) { 786 sin->sin_family = AF_INET; 787 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 788 sin->sin_port = 0; 789 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 790 *addr_len = sizeof(*sin); 791 } 792 if (inet->cmsg_flags) 793 ip_cmsg_recv(msg, skb); 794 if (flags & MSG_TRUNC) 795 copied = skb->len; 796 done: 797 skb_free_datagram(sk, skb); 798 out: 799 if (err) 800 return err; 801 return copied; 802 } 803 804 static int raw_sk_init(struct sock *sk) 805 { 806 struct raw_sock *rp = raw_sk(sk); 807 808 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 809 memset(&rp->filter, 0, sizeof(rp->filter)); 810 return 0; 811 } 812 813 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 814 { 815 if (optlen > sizeof(struct icmp_filter)) 816 optlen = sizeof(struct icmp_filter); 817 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 818 return -EFAULT; 819 return 0; 820 } 821 822 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 823 { 824 int len, ret = -EFAULT; 825 826 if (get_user(len, optlen)) 827 goto out; 828 ret = -EINVAL; 829 if (len < 0) 830 goto out; 831 if (len > sizeof(struct icmp_filter)) 832 len = sizeof(struct icmp_filter); 833 ret = -EFAULT; 834 if (put_user(len, optlen) || 835 copy_to_user(optval, &raw_sk(sk)->filter, len)) 836 goto out; 837 ret = 0; 838 out: return ret; 839 } 840 841 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 842 sockptr_t optval, unsigned int optlen) 843 { 844 if (optname == ICMP_FILTER) { 845 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 846 return -EOPNOTSUPP; 847 else 848 return raw_seticmpfilter(sk, optval, optlen); 849 } 850 return -ENOPROTOOPT; 851 } 852 853 static int raw_setsockopt(struct sock *sk, int level, int optname, 854 sockptr_t optval, unsigned int optlen) 855 { 856 if (level != SOL_RAW) 857 return ip_setsockopt(sk, level, optname, optval, optlen); 858 return do_raw_setsockopt(sk, level, optname, optval, optlen); 859 } 860 861 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 862 char __user *optval, int __user *optlen) 863 { 864 if (optname == ICMP_FILTER) { 865 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 866 return -EOPNOTSUPP; 867 else 868 return raw_geticmpfilter(sk, optval, optlen); 869 } 870 return -ENOPROTOOPT; 871 } 872 873 static int raw_getsockopt(struct sock *sk, int level, int optname, 874 char __user *optval, int __user *optlen) 875 { 876 if (level != SOL_RAW) 877 return ip_getsockopt(sk, level, optname, optval, optlen); 878 return do_raw_getsockopt(sk, level, optname, optval, optlen); 879 } 880 881 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 882 { 883 switch (cmd) { 884 case SIOCOUTQ: { 885 int amount = sk_wmem_alloc_get(sk); 886 887 return put_user(amount, (int __user *)arg); 888 } 889 case SIOCINQ: { 890 struct sk_buff *skb; 891 int amount = 0; 892 893 spin_lock_bh(&sk->sk_receive_queue.lock); 894 skb = skb_peek(&sk->sk_receive_queue); 895 if (skb) 896 amount = skb->len; 897 spin_unlock_bh(&sk->sk_receive_queue.lock); 898 return put_user(amount, (int __user *)arg); 899 } 900 901 default: 902 #ifdef CONFIG_IP_MROUTE 903 return ipmr_ioctl(sk, cmd, (void __user *)arg); 904 #else 905 return -ENOIOCTLCMD; 906 #endif 907 } 908 } 909 910 #ifdef CONFIG_COMPAT 911 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 912 { 913 switch (cmd) { 914 case SIOCOUTQ: 915 case SIOCINQ: 916 return -ENOIOCTLCMD; 917 default: 918 #ifdef CONFIG_IP_MROUTE 919 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 920 #else 921 return -ENOIOCTLCMD; 922 #endif 923 } 924 } 925 #endif 926 927 int raw_abort(struct sock *sk, int err) 928 { 929 lock_sock(sk); 930 931 sk->sk_err = err; 932 sk->sk_error_report(sk); 933 __udp_disconnect(sk, 0); 934 935 release_sock(sk); 936 937 return 0; 938 } 939 EXPORT_SYMBOL_GPL(raw_abort); 940 941 struct proto raw_prot = { 942 .name = "RAW", 943 .owner = THIS_MODULE, 944 .close = raw_close, 945 .destroy = raw_destroy, 946 .connect = ip4_datagram_connect, 947 .disconnect = __udp_disconnect, 948 .ioctl = raw_ioctl, 949 .init = raw_sk_init, 950 .setsockopt = raw_setsockopt, 951 .getsockopt = raw_getsockopt, 952 .sendmsg = raw_sendmsg, 953 .recvmsg = raw_recvmsg, 954 .bind = raw_bind, 955 .backlog_rcv = raw_rcv_skb, 956 .release_cb = ip4_datagram_release_cb, 957 .hash = raw_hash_sk, 958 .unhash = raw_unhash_sk, 959 .obj_size = sizeof(struct raw_sock), 960 .useroffset = offsetof(struct raw_sock, filter), 961 .usersize = sizeof_field(struct raw_sock, filter), 962 .h.raw_hash = &raw_v4_hashinfo, 963 #ifdef CONFIG_COMPAT 964 .compat_ioctl = compat_raw_ioctl, 965 #endif 966 .diag_destroy = raw_abort, 967 }; 968 969 #ifdef CONFIG_PROC_FS 970 static struct sock *raw_get_first(struct seq_file *seq) 971 { 972 struct sock *sk; 973 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 974 struct raw_iter_state *state = raw_seq_private(seq); 975 976 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 977 ++state->bucket) { 978 sk_for_each(sk, &h->ht[state->bucket]) 979 if (sock_net(sk) == seq_file_net(seq)) 980 goto found; 981 } 982 sk = NULL; 983 found: 984 return sk; 985 } 986 987 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 988 { 989 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 990 struct raw_iter_state *state = raw_seq_private(seq); 991 992 do { 993 sk = sk_next(sk); 994 try_again: 995 ; 996 } while (sk && sock_net(sk) != seq_file_net(seq)); 997 998 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 999 sk = sk_head(&h->ht[state->bucket]); 1000 goto try_again; 1001 } 1002 return sk; 1003 } 1004 1005 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1006 { 1007 struct sock *sk = raw_get_first(seq); 1008 1009 if (sk) 1010 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1011 --pos; 1012 return pos ? NULL : sk; 1013 } 1014 1015 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1016 __acquires(&h->lock) 1017 { 1018 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1019 1020 read_lock(&h->lock); 1021 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1022 } 1023 EXPORT_SYMBOL_GPL(raw_seq_start); 1024 1025 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1026 { 1027 struct sock *sk; 1028 1029 if (v == SEQ_START_TOKEN) 1030 sk = raw_get_first(seq); 1031 else 1032 sk = raw_get_next(seq, v); 1033 ++*pos; 1034 return sk; 1035 } 1036 EXPORT_SYMBOL_GPL(raw_seq_next); 1037 1038 void raw_seq_stop(struct seq_file *seq, void *v) 1039 __releases(&h->lock) 1040 { 1041 struct raw_hashinfo *h = PDE_DATA(file_inode(seq->file)); 1042 1043 read_unlock(&h->lock); 1044 } 1045 EXPORT_SYMBOL_GPL(raw_seq_stop); 1046 1047 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1048 { 1049 struct inet_sock *inet = inet_sk(sp); 1050 __be32 dest = inet->inet_daddr, 1051 src = inet->inet_rcv_saddr; 1052 __u16 destp = 0, 1053 srcp = inet->inet_num; 1054 1055 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1056 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1057 i, src, srcp, dest, destp, sp->sk_state, 1058 sk_wmem_alloc_get(sp), 1059 sk_rmem_alloc_get(sp), 1060 0, 0L, 0, 1061 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1062 0, sock_i_ino(sp), 1063 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1064 } 1065 1066 static int raw_seq_show(struct seq_file *seq, void *v) 1067 { 1068 if (v == SEQ_START_TOKEN) 1069 seq_printf(seq, " sl local_address rem_address st tx_queue " 1070 "rx_queue tr tm->when retrnsmt uid timeout " 1071 "inode ref pointer drops\n"); 1072 else 1073 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1074 return 0; 1075 } 1076 1077 static const struct seq_operations raw_seq_ops = { 1078 .start = raw_seq_start, 1079 .next = raw_seq_next, 1080 .stop = raw_seq_stop, 1081 .show = raw_seq_show, 1082 }; 1083 1084 static __net_init int raw_init_net(struct net *net) 1085 { 1086 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1087 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1088 return -ENOMEM; 1089 1090 return 0; 1091 } 1092 1093 static __net_exit void raw_exit_net(struct net *net) 1094 { 1095 remove_proc_entry("raw", net->proc_net); 1096 } 1097 1098 static __net_initdata struct pernet_operations raw_net_ops = { 1099 .init = raw_init_net, 1100 .exit = raw_exit_net, 1101 }; 1102 1103 int __init raw_proc_init(void) 1104 { 1105 return register_pernet_subsys(&raw_net_ops); 1106 } 1107 1108 void __init raw_proc_exit(void) 1109 { 1110 unregister_pernet_subsys(&raw_net_ops); 1111 } 1112 #endif /* CONFIG_PROC_FS */ 1113 1114 static void raw_sysctl_init_net(struct net *net) 1115 { 1116 #ifdef CONFIG_NET_L3_MASTER_DEV 1117 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1118 #endif 1119 } 1120 1121 static int __net_init raw_sysctl_init(struct net *net) 1122 { 1123 raw_sysctl_init_net(net); 1124 return 0; 1125 } 1126 1127 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1128 .init = raw_sysctl_init, 1129 }; 1130 1131 void __init raw_init(void) 1132 { 1133 raw_sysctl_init_net(&init_net); 1134 if (register_pernet_subsys(&raw_sysctl_ops)) 1135 panic("RAW: failed to init sysctl parameters.\n"); 1136 } 1137