1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * The IP to API glue. 7 * 8 * Authors: see ip.c 9 * 10 * Fixes: 11 * Many : Split from ip.c , see ip.c for history. 12 * Martin Mares : TOS setting fixed. 13 * Alan Cox : Fixed a couple of oopses in Martin's 14 * TOS tweaks. 15 * Mike McLagan : Routing by source 16 */ 17 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/mm.h> 21 #include <linux/skbuff.h> 22 #include <linux/ip.h> 23 #include <linux/icmp.h> 24 #include <linux/inetdevice.h> 25 #include <linux/netdevice.h> 26 #include <net/sock.h> 27 #include <net/ip.h> 28 #include <net/icmp.h> 29 #include <net/tcp_states.h> 30 #include <linux/udp.h> 31 #include <linux/igmp.h> 32 #include <linux/netfilter.h> 33 #include <linux/route.h> 34 #include <linux/mroute.h> 35 #include <net/route.h> 36 #include <net/xfrm.h> 37 #include <net/compat.h> 38 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 39 #include <net/transp_v6.h> 40 #endif 41 42 #include <linux/errqueue.h> 43 #include <asm/uaccess.h> 44 45 #define IP_CMSG_PKTINFO 1 46 #define IP_CMSG_TTL 2 47 #define IP_CMSG_TOS 4 48 #define IP_CMSG_RECVOPTS 8 49 #define IP_CMSG_RETOPTS 16 50 #define IP_CMSG_PASSSEC 32 51 #define IP_CMSG_ORIGDSTADDR 64 52 53 /* 54 * SOL_IP control messages. 55 */ 56 57 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 58 { 59 struct in_pktinfo info; 60 struct rtable *rt = skb_rtable(skb); 61 62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 63 if (rt) { 64 info.ipi_ifindex = rt->rt_iif; 65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst; 66 } else { 67 info.ipi_ifindex = 0; 68 info.ipi_spec_dst.s_addr = 0; 69 } 70 71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 72 } 73 74 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 75 { 76 int ttl = ip_hdr(skb)->ttl; 77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 78 } 79 80 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 81 { 82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 83 } 84 85 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 86 { 87 if (IPCB(skb)->opt.optlen == 0) 88 return; 89 90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 91 ip_hdr(skb) + 1); 92 } 93 94 95 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 96 { 97 unsigned char optbuf[sizeof(struct ip_options) + 40]; 98 struct ip_options * opt = (struct ip_options *)optbuf; 99 100 if (IPCB(skb)->opt.optlen == 0) 101 return; 102 103 if (ip_options_echo(opt, skb)) { 104 msg->msg_flags |= MSG_CTRUNC; 105 return; 106 } 107 ip_options_undo(opt); 108 109 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 110 } 111 112 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 113 { 114 char *secdata; 115 u32 seclen, secid; 116 int err; 117 118 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 119 if (err) 120 return; 121 122 err = security_secid_to_secctx(secid, &secdata, &seclen); 123 if (err) 124 return; 125 126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 127 security_release_secctx(secdata, seclen); 128 } 129 130 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 131 { 132 struct sockaddr_in sin; 133 struct iphdr *iph = ip_hdr(skb); 134 __be16 *ports = (__be16 *)skb_transport_header(skb); 135 136 if (skb_transport_offset(skb) + 4 > skb->len) 137 return; 138 139 /* All current transport protocols have the port numbers in the 140 * first four bytes of the transport header and this function is 141 * written with this assumption in mind. 142 */ 143 144 sin.sin_family = AF_INET; 145 sin.sin_addr.s_addr = iph->daddr; 146 sin.sin_port = ports[1]; 147 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 148 149 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 150 } 151 152 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 153 { 154 struct inet_sock *inet = inet_sk(skb->sk); 155 unsigned flags = inet->cmsg_flags; 156 157 /* Ordered by supposed usage frequency */ 158 if (flags & 1) 159 ip_cmsg_recv_pktinfo(msg, skb); 160 if ((flags >>= 1) == 0) 161 return; 162 163 if (flags & 1) 164 ip_cmsg_recv_ttl(msg, skb); 165 if ((flags >>= 1) == 0) 166 return; 167 168 if (flags & 1) 169 ip_cmsg_recv_tos(msg, skb); 170 if ((flags >>= 1) == 0) 171 return; 172 173 if (flags & 1) 174 ip_cmsg_recv_opts(msg, skb); 175 if ((flags >>= 1) == 0) 176 return; 177 178 if (flags & 1) 179 ip_cmsg_recv_retopts(msg, skb); 180 if ((flags >>= 1) == 0) 181 return; 182 183 if (flags & 1) 184 ip_cmsg_recv_security(msg, skb); 185 186 if ((flags >>= 1) == 0) 187 return; 188 if (flags & 1) 189 ip_cmsg_recv_dstaddr(msg, skb); 190 191 } 192 EXPORT_SYMBOL(ip_cmsg_recv); 193 194 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) 195 { 196 int err; 197 struct cmsghdr *cmsg; 198 199 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 200 if (!CMSG_OK(msg, cmsg)) 201 return -EINVAL; 202 if (cmsg->cmsg_level != SOL_IP) 203 continue; 204 switch (cmsg->cmsg_type) { 205 case IP_RETOPTS: 206 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 207 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 208 err < 40 ? err : 40); 209 if (err) 210 return err; 211 break; 212 case IP_PKTINFO: 213 { 214 struct in_pktinfo *info; 215 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 216 return -EINVAL; 217 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 218 ipc->oif = info->ipi_ifindex; 219 ipc->addr = info->ipi_spec_dst.s_addr; 220 break; 221 } 222 default: 223 return -EINVAL; 224 } 225 } 226 return 0; 227 } 228 229 230 /* Special input handler for packets caught by router alert option. 231 They are selected only by protocol field, and then processed likely 232 local ones; but only if someone wants them! Otherwise, router 233 not running rsvpd will kill RSVP. 234 235 It is user level problem, what it will make with them. 236 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 237 but receiver should be enough clever f.e. to forward mtrace requests, 238 sent to multicast group to reach destination designated router. 239 */ 240 struct ip_ra_chain *ip_ra_chain; 241 DEFINE_RWLOCK(ip_ra_lock); 242 243 int ip_ra_control(struct sock *sk, unsigned char on, 244 void (*destructor)(struct sock *)) 245 { 246 struct ip_ra_chain *ra, *new_ra, **rap; 247 248 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW) 249 return -EINVAL; 250 251 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 252 253 write_lock_bh(&ip_ra_lock); 254 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) { 255 if (ra->sk == sk) { 256 if (on) { 257 write_unlock_bh(&ip_ra_lock); 258 kfree(new_ra); 259 return -EADDRINUSE; 260 } 261 *rap = ra->next; 262 write_unlock_bh(&ip_ra_lock); 263 264 if (ra->destructor) 265 ra->destructor(sk); 266 sock_put(sk); 267 kfree(ra); 268 return 0; 269 } 270 } 271 if (new_ra == NULL) { 272 write_unlock_bh(&ip_ra_lock); 273 return -ENOBUFS; 274 } 275 new_ra->sk = sk; 276 new_ra->destructor = destructor; 277 278 new_ra->next = ra; 279 *rap = new_ra; 280 sock_hold(sk); 281 write_unlock_bh(&ip_ra_lock); 282 283 return 0; 284 } 285 286 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 287 __be16 port, u32 info, u8 *payload) 288 { 289 struct inet_sock *inet = inet_sk(sk); 290 struct sock_exterr_skb *serr; 291 292 if (!inet->recverr) 293 return; 294 295 skb = skb_clone(skb, GFP_ATOMIC); 296 if (!skb) 297 return; 298 299 serr = SKB_EXT_ERR(skb); 300 serr->ee.ee_errno = err; 301 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 302 serr->ee.ee_type = icmp_hdr(skb)->type; 303 serr->ee.ee_code = icmp_hdr(skb)->code; 304 serr->ee.ee_pad = 0; 305 serr->ee.ee_info = info; 306 serr->ee.ee_data = 0; 307 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 308 skb_network_header(skb); 309 serr->port = port; 310 311 if (skb_pull(skb, payload - skb->data) != NULL) { 312 skb_reset_transport_header(skb); 313 if (sock_queue_err_skb(sk, skb) == 0) 314 return; 315 } 316 kfree_skb(skb); 317 } 318 319 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 320 { 321 struct inet_sock *inet = inet_sk(sk); 322 struct sock_exterr_skb *serr; 323 struct iphdr *iph; 324 struct sk_buff *skb; 325 326 if (!inet->recverr) 327 return; 328 329 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 330 if (!skb) 331 return; 332 333 skb_put(skb, sizeof(struct iphdr)); 334 skb_reset_network_header(skb); 335 iph = ip_hdr(skb); 336 iph->daddr = daddr; 337 338 serr = SKB_EXT_ERR(skb); 339 serr->ee.ee_errno = err; 340 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 341 serr->ee.ee_type = 0; 342 serr->ee.ee_code = 0; 343 serr->ee.ee_pad = 0; 344 serr->ee.ee_info = info; 345 serr->ee.ee_data = 0; 346 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 347 serr->port = port; 348 349 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 350 skb_reset_transport_header(skb); 351 352 if (sock_queue_err_skb(sk, skb)) 353 kfree_skb(skb); 354 } 355 356 /* 357 * Handle MSG_ERRQUEUE 358 */ 359 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) 360 { 361 struct sock_exterr_skb *serr; 362 struct sk_buff *skb, *skb2; 363 struct sockaddr_in *sin; 364 struct { 365 struct sock_extended_err ee; 366 struct sockaddr_in offender; 367 } errhdr; 368 int err; 369 int copied; 370 371 err = -EAGAIN; 372 skb = skb_dequeue(&sk->sk_error_queue); 373 if (skb == NULL) 374 goto out; 375 376 copied = skb->len; 377 if (copied > len) { 378 msg->msg_flags |= MSG_TRUNC; 379 copied = len; 380 } 381 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 382 if (err) 383 goto out_free_skb; 384 385 sock_recv_timestamp(msg, sk, skb); 386 387 serr = SKB_EXT_ERR(skb); 388 389 sin = (struct sockaddr_in *)msg->msg_name; 390 if (sin) { 391 sin->sin_family = AF_INET; 392 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 393 serr->addr_offset); 394 sin->sin_port = serr->port; 395 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 396 } 397 398 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 399 sin = &errhdr.offender; 400 sin->sin_family = AF_UNSPEC; 401 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 402 struct inet_sock *inet = inet_sk(sk); 403 404 sin->sin_family = AF_INET; 405 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 406 sin->sin_port = 0; 407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 408 if (inet->cmsg_flags) 409 ip_cmsg_recv(msg, skb); 410 } 411 412 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 413 414 /* Now we could try to dump offended packet options */ 415 416 msg->msg_flags |= MSG_ERRQUEUE; 417 err = copied; 418 419 /* Reset and regenerate socket error */ 420 spin_lock_bh(&sk->sk_error_queue.lock); 421 sk->sk_err = 0; 422 skb2 = skb_peek(&sk->sk_error_queue); 423 if (skb2 != NULL) { 424 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 425 spin_unlock_bh(&sk->sk_error_queue.lock); 426 sk->sk_error_report(sk); 427 } else 428 spin_unlock_bh(&sk->sk_error_queue.lock); 429 430 out_free_skb: 431 kfree_skb(skb); 432 out: 433 return err; 434 } 435 436 437 /* 438 * Socket option code for IP. This is the end of the line after any 439 * TCP,UDP etc options on an IP socket. 440 */ 441 442 static int do_ip_setsockopt(struct sock *sk, int level, 443 int optname, char __user *optval, int optlen) 444 { 445 struct inet_sock *inet = inet_sk(sk); 446 int val = 0, err; 447 448 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) | 449 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) | 450 (1<<IP_RETOPTS) | (1<<IP_TOS) | 451 (1<<IP_TTL) | (1<<IP_HDRINCL) | 452 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) | 453 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) | 454 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) || 455 optname == IP_MULTICAST_TTL || 456 optname == IP_MULTICAST_ALL || 457 optname == IP_MULTICAST_LOOP || 458 optname == IP_RECVORIGDSTADDR) { 459 if (optlen >= sizeof(int)) { 460 if (get_user(val, (int __user *) optval)) 461 return -EFAULT; 462 } else if (optlen >= sizeof(char)) { 463 unsigned char ucval; 464 465 if (get_user(ucval, (unsigned char __user *) optval)) 466 return -EFAULT; 467 val = (int) ucval; 468 } 469 } 470 471 /* If optlen==0, it is equivalent to val == 0 */ 472 473 if (ip_mroute_opt(optname)) 474 return ip_mroute_setsockopt(sk, optname, optval, optlen); 475 476 err = 0; 477 lock_sock(sk); 478 479 switch (optname) { 480 case IP_OPTIONS: 481 { 482 struct ip_options *opt = NULL; 483 if (optlen > 40 || optlen < 0) 484 goto e_inval; 485 err = ip_options_get_from_user(sock_net(sk), &opt, 486 optval, optlen); 487 if (err) 488 break; 489 if (inet->is_icsk) { 490 struct inet_connection_sock *icsk = inet_csk(sk); 491 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 492 if (sk->sk_family == PF_INET || 493 (!((1 << sk->sk_state) & 494 (TCPF_LISTEN | TCPF_CLOSE)) && 495 inet->daddr != LOOPBACK4_IPV6)) { 496 #endif 497 if (inet->opt) 498 icsk->icsk_ext_hdr_len -= inet->opt->optlen; 499 if (opt) 500 icsk->icsk_ext_hdr_len += opt->optlen; 501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 502 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 503 } 504 #endif 505 } 506 opt = xchg(&inet->opt, opt); 507 kfree(opt); 508 break; 509 } 510 case IP_PKTINFO: 511 if (val) 512 inet->cmsg_flags |= IP_CMSG_PKTINFO; 513 else 514 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 515 break; 516 case IP_RECVTTL: 517 if (val) 518 inet->cmsg_flags |= IP_CMSG_TTL; 519 else 520 inet->cmsg_flags &= ~IP_CMSG_TTL; 521 break; 522 case IP_RECVTOS: 523 if (val) 524 inet->cmsg_flags |= IP_CMSG_TOS; 525 else 526 inet->cmsg_flags &= ~IP_CMSG_TOS; 527 break; 528 case IP_RECVOPTS: 529 if (val) 530 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 531 else 532 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 533 break; 534 case IP_RETOPTS: 535 if (val) 536 inet->cmsg_flags |= IP_CMSG_RETOPTS; 537 else 538 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 539 break; 540 case IP_PASSSEC: 541 if (val) 542 inet->cmsg_flags |= IP_CMSG_PASSSEC; 543 else 544 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 545 break; 546 case IP_RECVORIGDSTADDR: 547 if (val) 548 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 549 else 550 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 551 break; 552 case IP_TOS: /* This sets both TOS and Precedence */ 553 if (sk->sk_type == SOCK_STREAM) { 554 val &= ~3; 555 val |= inet->tos & 3; 556 } 557 if (inet->tos != val) { 558 inet->tos = val; 559 sk->sk_priority = rt_tos2priority(val); 560 sk_dst_reset(sk); 561 } 562 break; 563 case IP_TTL: 564 if (optlen < 1) 565 goto e_inval; 566 if (val != -1 && (val < 0 || val > 255)) 567 goto e_inval; 568 inet->uc_ttl = val; 569 break; 570 case IP_HDRINCL: 571 if (sk->sk_type != SOCK_RAW) { 572 err = -ENOPROTOOPT; 573 break; 574 } 575 inet->hdrincl = val ? 1 : 0; 576 break; 577 case IP_MTU_DISCOVER: 578 if (val < 0 || val > 3) 579 goto e_inval; 580 inet->pmtudisc = val; 581 break; 582 case IP_RECVERR: 583 inet->recverr = !!val; 584 if (!val) 585 skb_queue_purge(&sk->sk_error_queue); 586 break; 587 case IP_MULTICAST_TTL: 588 if (sk->sk_type == SOCK_STREAM) 589 goto e_inval; 590 if (optlen < 1) 591 goto e_inval; 592 if (val == -1) 593 val = 1; 594 if (val < 0 || val > 255) 595 goto e_inval; 596 inet->mc_ttl = val; 597 break; 598 case IP_MULTICAST_LOOP: 599 if (optlen < 1) 600 goto e_inval; 601 inet->mc_loop = !!val; 602 break; 603 case IP_MULTICAST_IF: 604 { 605 struct ip_mreqn mreq; 606 struct net_device *dev = NULL; 607 608 if (sk->sk_type == SOCK_STREAM) 609 goto e_inval; 610 /* 611 * Check the arguments are allowable 612 */ 613 614 err = -EFAULT; 615 if (optlen >= sizeof(struct ip_mreqn)) { 616 if (copy_from_user(&mreq, optval, sizeof(mreq))) 617 break; 618 } else { 619 memset(&mreq, 0, sizeof(mreq)); 620 if (optlen >= sizeof(struct in_addr) && 621 copy_from_user(&mreq.imr_address, optval, 622 sizeof(struct in_addr))) 623 break; 624 } 625 626 if (!mreq.imr_ifindex) { 627 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 628 inet->mc_index = 0; 629 inet->mc_addr = 0; 630 err = 0; 631 break; 632 } 633 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 634 if (dev) { 635 mreq.imr_ifindex = dev->ifindex; 636 dev_put(dev); 637 } 638 } else 639 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 640 641 642 err = -EADDRNOTAVAIL; 643 if (!dev) 644 break; 645 646 err = -EINVAL; 647 if (sk->sk_bound_dev_if && 648 mreq.imr_ifindex != sk->sk_bound_dev_if) 649 break; 650 651 inet->mc_index = mreq.imr_ifindex; 652 inet->mc_addr = mreq.imr_address.s_addr; 653 err = 0; 654 break; 655 } 656 657 case IP_ADD_MEMBERSHIP: 658 case IP_DROP_MEMBERSHIP: 659 { 660 struct ip_mreqn mreq; 661 662 err = -EPROTO; 663 if (inet_sk(sk)->is_icsk) 664 break; 665 666 if (optlen < sizeof(struct ip_mreq)) 667 goto e_inval; 668 err = -EFAULT; 669 if (optlen >= sizeof(struct ip_mreqn)) { 670 if (copy_from_user(&mreq, optval, sizeof(mreq))) 671 break; 672 } else { 673 memset(&mreq, 0, sizeof(mreq)); 674 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 675 break; 676 } 677 678 if (optname == IP_ADD_MEMBERSHIP) 679 err = ip_mc_join_group(sk, &mreq); 680 else 681 err = ip_mc_leave_group(sk, &mreq); 682 break; 683 } 684 case IP_MSFILTER: 685 { 686 struct ip_msfilter *msf; 687 688 if (optlen < IP_MSFILTER_SIZE(0)) 689 goto e_inval; 690 if (optlen > sysctl_optmem_max) { 691 err = -ENOBUFS; 692 break; 693 } 694 msf = kmalloc(optlen, GFP_KERNEL); 695 if (!msf) { 696 err = -ENOBUFS; 697 break; 698 } 699 err = -EFAULT; 700 if (copy_from_user(msf, optval, optlen)) { 701 kfree(msf); 702 break; 703 } 704 /* numsrc >= (1G-4) overflow in 32 bits */ 705 if (msf->imsf_numsrc >= 0x3ffffffcU || 706 msf->imsf_numsrc > sysctl_igmp_max_msf) { 707 kfree(msf); 708 err = -ENOBUFS; 709 break; 710 } 711 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 712 kfree(msf); 713 err = -EINVAL; 714 break; 715 } 716 err = ip_mc_msfilter(sk, msf, 0); 717 kfree(msf); 718 break; 719 } 720 case IP_BLOCK_SOURCE: 721 case IP_UNBLOCK_SOURCE: 722 case IP_ADD_SOURCE_MEMBERSHIP: 723 case IP_DROP_SOURCE_MEMBERSHIP: 724 { 725 struct ip_mreq_source mreqs; 726 int omode, add; 727 728 if (optlen != sizeof(struct ip_mreq_source)) 729 goto e_inval; 730 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 731 err = -EFAULT; 732 break; 733 } 734 if (optname == IP_BLOCK_SOURCE) { 735 omode = MCAST_EXCLUDE; 736 add = 1; 737 } else if (optname == IP_UNBLOCK_SOURCE) { 738 omode = MCAST_EXCLUDE; 739 add = 0; 740 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 741 struct ip_mreqn mreq; 742 743 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 744 mreq.imr_address.s_addr = mreqs.imr_interface; 745 mreq.imr_ifindex = 0; 746 err = ip_mc_join_group(sk, &mreq); 747 if (err && err != -EADDRINUSE) 748 break; 749 omode = MCAST_INCLUDE; 750 add = 1; 751 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 752 omode = MCAST_INCLUDE; 753 add = 0; 754 } 755 err = ip_mc_source(add, omode, sk, &mreqs, 0); 756 break; 757 } 758 case MCAST_JOIN_GROUP: 759 case MCAST_LEAVE_GROUP: 760 { 761 struct group_req greq; 762 struct sockaddr_in *psin; 763 struct ip_mreqn mreq; 764 765 if (optlen < sizeof(struct group_req)) 766 goto e_inval; 767 err = -EFAULT; 768 if (copy_from_user(&greq, optval, sizeof(greq))) 769 break; 770 psin = (struct sockaddr_in *)&greq.gr_group; 771 if (psin->sin_family != AF_INET) 772 goto e_inval; 773 memset(&mreq, 0, sizeof(mreq)); 774 mreq.imr_multiaddr = psin->sin_addr; 775 mreq.imr_ifindex = greq.gr_interface; 776 777 if (optname == MCAST_JOIN_GROUP) 778 err = ip_mc_join_group(sk, &mreq); 779 else 780 err = ip_mc_leave_group(sk, &mreq); 781 break; 782 } 783 case MCAST_JOIN_SOURCE_GROUP: 784 case MCAST_LEAVE_SOURCE_GROUP: 785 case MCAST_BLOCK_SOURCE: 786 case MCAST_UNBLOCK_SOURCE: 787 { 788 struct group_source_req greqs; 789 struct ip_mreq_source mreqs; 790 struct sockaddr_in *psin; 791 int omode, add; 792 793 if (optlen != sizeof(struct group_source_req)) 794 goto e_inval; 795 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 796 err = -EFAULT; 797 break; 798 } 799 if (greqs.gsr_group.ss_family != AF_INET || 800 greqs.gsr_source.ss_family != AF_INET) { 801 err = -EADDRNOTAVAIL; 802 break; 803 } 804 psin = (struct sockaddr_in *)&greqs.gsr_group; 805 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 806 psin = (struct sockaddr_in *)&greqs.gsr_source; 807 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 808 mreqs.imr_interface = 0; /* use index for mc_source */ 809 810 if (optname == MCAST_BLOCK_SOURCE) { 811 omode = MCAST_EXCLUDE; 812 add = 1; 813 } else if (optname == MCAST_UNBLOCK_SOURCE) { 814 omode = MCAST_EXCLUDE; 815 add = 0; 816 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 817 struct ip_mreqn mreq; 818 819 psin = (struct sockaddr_in *)&greqs.gsr_group; 820 mreq.imr_multiaddr = psin->sin_addr; 821 mreq.imr_address.s_addr = 0; 822 mreq.imr_ifindex = greqs.gsr_interface; 823 err = ip_mc_join_group(sk, &mreq); 824 if (err && err != -EADDRINUSE) 825 break; 826 greqs.gsr_interface = mreq.imr_ifindex; 827 omode = MCAST_INCLUDE; 828 add = 1; 829 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 830 omode = MCAST_INCLUDE; 831 add = 0; 832 } 833 err = ip_mc_source(add, omode, sk, &mreqs, 834 greqs.gsr_interface); 835 break; 836 } 837 case MCAST_MSFILTER: 838 { 839 struct sockaddr_in *psin; 840 struct ip_msfilter *msf = NULL; 841 struct group_filter *gsf = NULL; 842 int msize, i, ifindex; 843 844 if (optlen < GROUP_FILTER_SIZE(0)) 845 goto e_inval; 846 if (optlen > sysctl_optmem_max) { 847 err = -ENOBUFS; 848 break; 849 } 850 gsf = kmalloc(optlen, GFP_KERNEL); 851 if (!gsf) { 852 err = -ENOBUFS; 853 break; 854 } 855 err = -EFAULT; 856 if (copy_from_user(gsf, optval, optlen)) 857 goto mc_msf_out; 858 859 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 860 if (gsf->gf_numsrc >= 0x1ffffff || 861 gsf->gf_numsrc > sysctl_igmp_max_msf) { 862 err = -ENOBUFS; 863 goto mc_msf_out; 864 } 865 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 866 err = -EINVAL; 867 goto mc_msf_out; 868 } 869 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 870 msf = kmalloc(msize, GFP_KERNEL); 871 if (!msf) { 872 err = -ENOBUFS; 873 goto mc_msf_out; 874 } 875 ifindex = gsf->gf_interface; 876 psin = (struct sockaddr_in *)&gsf->gf_group; 877 if (psin->sin_family != AF_INET) { 878 err = -EADDRNOTAVAIL; 879 goto mc_msf_out; 880 } 881 msf->imsf_multiaddr = psin->sin_addr.s_addr; 882 msf->imsf_interface = 0; 883 msf->imsf_fmode = gsf->gf_fmode; 884 msf->imsf_numsrc = gsf->gf_numsrc; 885 err = -EADDRNOTAVAIL; 886 for (i = 0; i < gsf->gf_numsrc; ++i) { 887 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 888 889 if (psin->sin_family != AF_INET) 890 goto mc_msf_out; 891 msf->imsf_slist[i] = psin->sin_addr.s_addr; 892 } 893 kfree(gsf); 894 gsf = NULL; 895 896 err = ip_mc_msfilter(sk, msf, ifindex); 897 mc_msf_out: 898 kfree(msf); 899 kfree(gsf); 900 break; 901 } 902 case IP_MULTICAST_ALL: 903 if (optlen < 1) 904 goto e_inval; 905 if (val != 0 && val != 1) 906 goto e_inval; 907 inet->mc_all = val; 908 break; 909 case IP_ROUTER_ALERT: 910 err = ip_ra_control(sk, val ? 1 : 0, NULL); 911 break; 912 913 case IP_FREEBIND: 914 if (optlen < 1) 915 goto e_inval; 916 inet->freebind = !!val; 917 break; 918 919 case IP_IPSEC_POLICY: 920 case IP_XFRM_POLICY: 921 err = -EPERM; 922 if (!capable(CAP_NET_ADMIN)) 923 break; 924 err = xfrm_user_policy(sk, optname, optval, optlen); 925 break; 926 927 case IP_TRANSPARENT: 928 if (!capable(CAP_NET_ADMIN)) { 929 err = -EPERM; 930 break; 931 } 932 if (optlen < 1) 933 goto e_inval; 934 inet->transparent = !!val; 935 break; 936 937 default: 938 err = -ENOPROTOOPT; 939 break; 940 } 941 release_sock(sk); 942 return err; 943 944 e_inval: 945 release_sock(sk); 946 return -EINVAL; 947 } 948 949 int ip_setsockopt(struct sock *sk, int level, 950 int optname, char __user *optval, int optlen) 951 { 952 int err; 953 954 if (level != SOL_IP) 955 return -ENOPROTOOPT; 956 957 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 958 #ifdef CONFIG_NETFILTER 959 /* we need to exclude all possible ENOPROTOOPTs except default case */ 960 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 961 optname != IP_IPSEC_POLICY && 962 optname != IP_XFRM_POLICY && 963 !ip_mroute_opt(optname)) { 964 lock_sock(sk); 965 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 966 release_sock(sk); 967 } 968 #endif 969 return err; 970 } 971 EXPORT_SYMBOL(ip_setsockopt); 972 973 #ifdef CONFIG_COMPAT 974 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 975 char __user *optval, int optlen) 976 { 977 int err; 978 979 if (level != SOL_IP) 980 return -ENOPROTOOPT; 981 982 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 983 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 984 ip_setsockopt); 985 986 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 987 #ifdef CONFIG_NETFILTER 988 /* we need to exclude all possible ENOPROTOOPTs except default case */ 989 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 990 optname != IP_IPSEC_POLICY && 991 optname != IP_XFRM_POLICY && 992 !ip_mroute_opt(optname)) { 993 lock_sock(sk); 994 err = compat_nf_setsockopt(sk, PF_INET, optname, 995 optval, optlen); 996 release_sock(sk); 997 } 998 #endif 999 return err; 1000 } 1001 EXPORT_SYMBOL(compat_ip_setsockopt); 1002 #endif 1003 1004 /* 1005 * Get the options. Note for future reference. The GET of IP options gets 1006 * the _received_ ones. The set sets the _sent_ ones. 1007 */ 1008 1009 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1010 char __user *optval, int __user *optlen) 1011 { 1012 struct inet_sock *inet = inet_sk(sk); 1013 int val; 1014 int len; 1015 1016 if (level != SOL_IP) 1017 return -EOPNOTSUPP; 1018 1019 if (ip_mroute_opt(optname)) 1020 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1021 1022 if (get_user(len, optlen)) 1023 return -EFAULT; 1024 if (len < 0) 1025 return -EINVAL; 1026 1027 lock_sock(sk); 1028 1029 switch (optname) { 1030 case IP_OPTIONS: 1031 { 1032 unsigned char optbuf[sizeof(struct ip_options)+40]; 1033 struct ip_options * opt = (struct ip_options *)optbuf; 1034 opt->optlen = 0; 1035 if (inet->opt) 1036 memcpy(optbuf, inet->opt, 1037 sizeof(struct ip_options)+ 1038 inet->opt->optlen); 1039 release_sock(sk); 1040 1041 if (opt->optlen == 0) 1042 return put_user(0, optlen); 1043 1044 ip_options_undo(opt); 1045 1046 len = min_t(unsigned int, len, opt->optlen); 1047 if (put_user(len, optlen)) 1048 return -EFAULT; 1049 if (copy_to_user(optval, opt->__data, len)) 1050 return -EFAULT; 1051 return 0; 1052 } 1053 case IP_PKTINFO: 1054 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1055 break; 1056 case IP_RECVTTL: 1057 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1058 break; 1059 case IP_RECVTOS: 1060 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1061 break; 1062 case IP_RECVOPTS: 1063 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1064 break; 1065 case IP_RETOPTS: 1066 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1067 break; 1068 case IP_PASSSEC: 1069 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1070 break; 1071 case IP_RECVORIGDSTADDR: 1072 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1073 break; 1074 case IP_TOS: 1075 val = inet->tos; 1076 break; 1077 case IP_TTL: 1078 val = (inet->uc_ttl == -1 ? 1079 sysctl_ip_default_ttl : 1080 inet->uc_ttl); 1081 break; 1082 case IP_HDRINCL: 1083 val = inet->hdrincl; 1084 break; 1085 case IP_MTU_DISCOVER: 1086 val = inet->pmtudisc; 1087 break; 1088 case IP_MTU: 1089 { 1090 struct dst_entry *dst; 1091 val = 0; 1092 dst = sk_dst_get(sk); 1093 if (dst) { 1094 val = dst_mtu(dst); 1095 dst_release(dst); 1096 } 1097 if (!val) { 1098 release_sock(sk); 1099 return -ENOTCONN; 1100 } 1101 break; 1102 } 1103 case IP_RECVERR: 1104 val = inet->recverr; 1105 break; 1106 case IP_MULTICAST_TTL: 1107 val = inet->mc_ttl; 1108 break; 1109 case IP_MULTICAST_LOOP: 1110 val = inet->mc_loop; 1111 break; 1112 case IP_MULTICAST_IF: 1113 { 1114 struct in_addr addr; 1115 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1116 addr.s_addr = inet->mc_addr; 1117 release_sock(sk); 1118 1119 if (put_user(len, optlen)) 1120 return -EFAULT; 1121 if (copy_to_user(optval, &addr, len)) 1122 return -EFAULT; 1123 return 0; 1124 } 1125 case IP_MSFILTER: 1126 { 1127 struct ip_msfilter msf; 1128 int err; 1129 1130 if (len < IP_MSFILTER_SIZE(0)) { 1131 release_sock(sk); 1132 return -EINVAL; 1133 } 1134 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1135 release_sock(sk); 1136 return -EFAULT; 1137 } 1138 err = ip_mc_msfget(sk, &msf, 1139 (struct ip_msfilter __user *)optval, optlen); 1140 release_sock(sk); 1141 return err; 1142 } 1143 case MCAST_MSFILTER: 1144 { 1145 struct group_filter gsf; 1146 int err; 1147 1148 if (len < GROUP_FILTER_SIZE(0)) { 1149 release_sock(sk); 1150 return -EINVAL; 1151 } 1152 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1153 release_sock(sk); 1154 return -EFAULT; 1155 } 1156 err = ip_mc_gsfget(sk, &gsf, 1157 (struct group_filter __user *)optval, 1158 optlen); 1159 release_sock(sk); 1160 return err; 1161 } 1162 case IP_MULTICAST_ALL: 1163 val = inet->mc_all; 1164 break; 1165 case IP_PKTOPTIONS: 1166 { 1167 struct msghdr msg; 1168 1169 release_sock(sk); 1170 1171 if (sk->sk_type != SOCK_STREAM) 1172 return -ENOPROTOOPT; 1173 1174 msg.msg_control = optval; 1175 msg.msg_controllen = len; 1176 msg.msg_flags = 0; 1177 1178 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1179 struct in_pktinfo info; 1180 1181 info.ipi_addr.s_addr = inet->rcv_saddr; 1182 info.ipi_spec_dst.s_addr = inet->rcv_saddr; 1183 info.ipi_ifindex = inet->mc_index; 1184 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1185 } 1186 if (inet->cmsg_flags & IP_CMSG_TTL) { 1187 int hlim = inet->mc_ttl; 1188 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1189 } 1190 len -= msg.msg_controllen; 1191 return put_user(len, optlen); 1192 } 1193 case IP_FREEBIND: 1194 val = inet->freebind; 1195 break; 1196 case IP_TRANSPARENT: 1197 val = inet->transparent; 1198 break; 1199 default: 1200 release_sock(sk); 1201 return -ENOPROTOOPT; 1202 } 1203 release_sock(sk); 1204 1205 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1206 unsigned char ucval = (unsigned char)val; 1207 len = 1; 1208 if (put_user(len, optlen)) 1209 return -EFAULT; 1210 if (copy_to_user(optval, &ucval, 1)) 1211 return -EFAULT; 1212 } else { 1213 len = min_t(unsigned int, sizeof(int), len); 1214 if (put_user(len, optlen)) 1215 return -EFAULT; 1216 if (copy_to_user(optval, &val, len)) 1217 return -EFAULT; 1218 } 1219 return 0; 1220 } 1221 1222 int ip_getsockopt(struct sock *sk, int level, 1223 int optname, char __user *optval, int __user *optlen) 1224 { 1225 int err; 1226 1227 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1228 #ifdef CONFIG_NETFILTER 1229 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1230 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1231 !ip_mroute_opt(optname)) { 1232 int len; 1233 1234 if (get_user(len, optlen)) 1235 return -EFAULT; 1236 1237 lock_sock(sk); 1238 err = nf_getsockopt(sk, PF_INET, optname, optval, 1239 &len); 1240 release_sock(sk); 1241 if (err >= 0) 1242 err = put_user(len, optlen); 1243 return err; 1244 } 1245 #endif 1246 return err; 1247 } 1248 EXPORT_SYMBOL(ip_getsockopt); 1249 1250 #ifdef CONFIG_COMPAT 1251 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1252 char __user *optval, int __user *optlen) 1253 { 1254 int err; 1255 1256 if (optname == MCAST_MSFILTER) 1257 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1258 ip_getsockopt); 1259 1260 err = do_ip_getsockopt(sk, level, optname, optval, optlen); 1261 1262 #ifdef CONFIG_NETFILTER 1263 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1264 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1265 !ip_mroute_opt(optname)) { 1266 int len; 1267 1268 if (get_user(len, optlen)) 1269 return -EFAULT; 1270 1271 lock_sock(sk); 1272 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1273 release_sock(sk); 1274 if (err >= 0) 1275 err = put_user(len, optlen); 1276 return err; 1277 } 1278 #endif 1279 return err; 1280 } 1281 EXPORT_SYMBOL(compat_ip_getsockopt); 1282 #endif 1283