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 <linux/slab.h> 27 #include <net/sock.h> 28 #include <net/ip.h> 29 #include <net/icmp.h> 30 #include <net/tcp_states.h> 31 #include <linux/udp.h> 32 #include <linux/igmp.h> 33 #include <linux/netfilter.h> 34 #include <linux/route.h> 35 #include <linux/mroute.h> 36 #include <net/inet_ecn.h> 37 #include <net/route.h> 38 #include <net/xfrm.h> 39 #include <net/compat.h> 40 #if IS_ENABLED(CONFIG_IPV6) 41 #include <net/transp_v6.h> 42 #endif 43 #include <net/ip_fib.h> 44 45 #include <linux/errqueue.h> 46 #include <asm/uaccess.h> 47 48 #define IP_CMSG_PKTINFO 1 49 #define IP_CMSG_TTL 2 50 #define IP_CMSG_TOS 4 51 #define IP_CMSG_RECVOPTS 8 52 #define IP_CMSG_RETOPTS 16 53 #define IP_CMSG_PASSSEC 32 54 #define IP_CMSG_ORIGDSTADDR 64 55 56 /* 57 * SOL_IP control messages. 58 */ 59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb)) 60 61 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 62 { 63 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 64 65 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 66 67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 68 } 69 70 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 71 { 72 int ttl = ip_hdr(skb)->ttl; 73 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 74 } 75 76 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 77 { 78 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 79 } 80 81 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 82 { 83 if (IPCB(skb)->opt.optlen == 0) 84 return; 85 86 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 87 ip_hdr(skb) + 1); 88 } 89 90 91 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 92 { 93 unsigned char optbuf[sizeof(struct ip_options) + 40]; 94 struct ip_options *opt = (struct ip_options *)optbuf; 95 96 if (IPCB(skb)->opt.optlen == 0) 97 return; 98 99 if (ip_options_echo(opt, skb)) { 100 msg->msg_flags |= MSG_CTRUNC; 101 return; 102 } 103 ip_options_undo(opt); 104 105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 106 } 107 108 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 109 { 110 char *secdata; 111 u32 seclen, secid; 112 int err; 113 114 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 115 if (err) 116 return; 117 118 err = security_secid_to_secctx(secid, &secdata, &seclen); 119 if (err) 120 return; 121 122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 123 security_release_secctx(secdata, seclen); 124 } 125 126 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 127 { 128 struct sockaddr_in sin; 129 const struct iphdr *iph = ip_hdr(skb); 130 __be16 *ports = (__be16 *)skb_transport_header(skb); 131 132 if (skb_transport_offset(skb) + 4 > skb->len) 133 return; 134 135 /* All current transport protocols have the port numbers in the 136 * first four bytes of the transport header and this function is 137 * written with this assumption in mind. 138 */ 139 140 sin.sin_family = AF_INET; 141 sin.sin_addr.s_addr = iph->daddr; 142 sin.sin_port = ports[1]; 143 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 144 145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 146 } 147 148 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 149 { 150 struct inet_sock *inet = inet_sk(skb->sk); 151 unsigned int flags = inet->cmsg_flags; 152 153 /* Ordered by supposed usage frequency */ 154 if (flags & 1) 155 ip_cmsg_recv_pktinfo(msg, skb); 156 if ((flags >>= 1) == 0) 157 return; 158 159 if (flags & 1) 160 ip_cmsg_recv_ttl(msg, skb); 161 if ((flags >>= 1) == 0) 162 return; 163 164 if (flags & 1) 165 ip_cmsg_recv_tos(msg, skb); 166 if ((flags >>= 1) == 0) 167 return; 168 169 if (flags & 1) 170 ip_cmsg_recv_opts(msg, skb); 171 if ((flags >>= 1) == 0) 172 return; 173 174 if (flags & 1) 175 ip_cmsg_recv_retopts(msg, skb); 176 if ((flags >>= 1) == 0) 177 return; 178 179 if (flags & 1) 180 ip_cmsg_recv_security(msg, skb); 181 182 if ((flags >>= 1) == 0) 183 return; 184 if (flags & 1) 185 ip_cmsg_recv_dstaddr(msg, skb); 186 187 } 188 EXPORT_SYMBOL(ip_cmsg_recv); 189 190 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) 191 { 192 int err, val; 193 struct cmsghdr *cmsg; 194 195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 196 if (!CMSG_OK(msg, cmsg)) 197 return -EINVAL; 198 if (cmsg->cmsg_level != SOL_IP) 199 continue; 200 switch (cmsg->cmsg_type) { 201 case IP_RETOPTS: 202 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 203 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 204 err < 40 ? err : 40); 205 if (err) 206 return err; 207 break; 208 case IP_PKTINFO: 209 { 210 struct in_pktinfo *info; 211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 212 return -EINVAL; 213 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 214 ipc->oif = info->ipi_ifindex; 215 ipc->addr = info->ipi_spec_dst.s_addr; 216 break; 217 } 218 case IP_TTL: 219 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 220 return -EINVAL; 221 val = *(int *)CMSG_DATA(cmsg); 222 if (val < 1 || val > 255) 223 return -EINVAL; 224 ipc->ttl = val; 225 break; 226 case IP_TOS: 227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 228 return -EINVAL; 229 val = *(int *)CMSG_DATA(cmsg); 230 if (val < 0 || val > 255) 231 return -EINVAL; 232 ipc->tos = val; 233 ipc->priority = rt_tos2priority(ipc->tos); 234 break; 235 236 default: 237 return -EINVAL; 238 } 239 } 240 return 0; 241 } 242 243 244 /* Special input handler for packets caught by router alert option. 245 They are selected only by protocol field, and then processed likely 246 local ones; but only if someone wants them! Otherwise, router 247 not running rsvpd will kill RSVP. 248 249 It is user level problem, what it will make with them. 250 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 251 but receiver should be enough clever f.e. to forward mtrace requests, 252 sent to multicast group to reach destination designated router. 253 */ 254 struct ip_ra_chain __rcu *ip_ra_chain; 255 static DEFINE_SPINLOCK(ip_ra_lock); 256 257 258 static void ip_ra_destroy_rcu(struct rcu_head *head) 259 { 260 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 261 262 sock_put(ra->saved_sk); 263 kfree(ra); 264 } 265 266 int ip_ra_control(struct sock *sk, unsigned char on, 267 void (*destructor)(struct sock *)) 268 { 269 struct ip_ra_chain *ra, *new_ra; 270 struct ip_ra_chain __rcu **rap; 271 272 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 273 return -EINVAL; 274 275 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 276 277 spin_lock_bh(&ip_ra_lock); 278 for (rap = &ip_ra_chain; 279 (ra = rcu_dereference_protected(*rap, 280 lockdep_is_held(&ip_ra_lock))) != NULL; 281 rap = &ra->next) { 282 if (ra->sk == sk) { 283 if (on) { 284 spin_unlock_bh(&ip_ra_lock); 285 kfree(new_ra); 286 return -EADDRINUSE; 287 } 288 /* dont let ip_call_ra_chain() use sk again */ 289 ra->sk = NULL; 290 rcu_assign_pointer(*rap, ra->next); 291 spin_unlock_bh(&ip_ra_lock); 292 293 if (ra->destructor) 294 ra->destructor(sk); 295 /* 296 * Delay sock_put(sk) and kfree(ra) after one rcu grace 297 * period. This guarantee ip_call_ra_chain() dont need 298 * to mess with socket refcounts. 299 */ 300 ra->saved_sk = sk; 301 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 302 return 0; 303 } 304 } 305 if (new_ra == NULL) { 306 spin_unlock_bh(&ip_ra_lock); 307 return -ENOBUFS; 308 } 309 new_ra->sk = sk; 310 new_ra->destructor = destructor; 311 312 new_ra->next = ra; 313 rcu_assign_pointer(*rap, new_ra); 314 sock_hold(sk); 315 spin_unlock_bh(&ip_ra_lock); 316 317 return 0; 318 } 319 320 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 321 __be16 port, u32 info, u8 *payload) 322 { 323 struct sock_exterr_skb *serr; 324 325 skb = skb_clone(skb, GFP_ATOMIC); 326 if (!skb) 327 return; 328 329 serr = SKB_EXT_ERR(skb); 330 serr->ee.ee_errno = err; 331 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 332 serr->ee.ee_type = icmp_hdr(skb)->type; 333 serr->ee.ee_code = icmp_hdr(skb)->code; 334 serr->ee.ee_pad = 0; 335 serr->ee.ee_info = info; 336 serr->ee.ee_data = 0; 337 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 338 skb_network_header(skb); 339 serr->port = port; 340 341 if (skb_pull(skb, payload - skb->data) != NULL) { 342 skb_reset_transport_header(skb); 343 if (sock_queue_err_skb(sk, skb) == 0) 344 return; 345 } 346 kfree_skb(skb); 347 } 348 349 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 350 { 351 struct inet_sock *inet = inet_sk(sk); 352 struct sock_exterr_skb *serr; 353 struct iphdr *iph; 354 struct sk_buff *skb; 355 356 if (!inet->recverr) 357 return; 358 359 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 360 if (!skb) 361 return; 362 363 skb_put(skb, sizeof(struct iphdr)); 364 skb_reset_network_header(skb); 365 iph = ip_hdr(skb); 366 iph->daddr = daddr; 367 368 serr = SKB_EXT_ERR(skb); 369 serr->ee.ee_errno = err; 370 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 371 serr->ee.ee_type = 0; 372 serr->ee.ee_code = 0; 373 serr->ee.ee_pad = 0; 374 serr->ee.ee_info = info; 375 serr->ee.ee_data = 0; 376 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 377 serr->port = port; 378 379 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 380 skb_reset_transport_header(skb); 381 382 if (sock_queue_err_skb(sk, skb)) 383 kfree_skb(skb); 384 } 385 386 /* 387 * Handle MSG_ERRQUEUE 388 */ 389 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len) 390 { 391 struct sock_exterr_skb *serr; 392 struct sk_buff *skb, *skb2; 393 struct sockaddr_in *sin; 394 struct { 395 struct sock_extended_err ee; 396 struct sockaddr_in offender; 397 } errhdr; 398 int err; 399 int copied; 400 401 err = -EAGAIN; 402 skb = skb_dequeue(&sk->sk_error_queue); 403 if (skb == NULL) 404 goto out; 405 406 copied = skb->len; 407 if (copied > len) { 408 msg->msg_flags |= MSG_TRUNC; 409 copied = len; 410 } 411 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 412 if (err) 413 goto out_free_skb; 414 415 sock_recv_timestamp(msg, sk, skb); 416 417 serr = SKB_EXT_ERR(skb); 418 419 sin = (struct sockaddr_in *)msg->msg_name; 420 if (sin) { 421 sin->sin_family = AF_INET; 422 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 423 serr->addr_offset); 424 sin->sin_port = serr->port; 425 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 426 } 427 428 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 429 sin = &errhdr.offender; 430 sin->sin_family = AF_UNSPEC; 431 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 432 struct inet_sock *inet = inet_sk(sk); 433 434 sin->sin_family = AF_INET; 435 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 436 sin->sin_port = 0; 437 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 438 if (inet->cmsg_flags) 439 ip_cmsg_recv(msg, skb); 440 } 441 442 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 443 444 /* Now we could try to dump offended packet options */ 445 446 msg->msg_flags |= MSG_ERRQUEUE; 447 err = copied; 448 449 /* Reset and regenerate socket error */ 450 spin_lock_bh(&sk->sk_error_queue.lock); 451 sk->sk_err = 0; 452 skb2 = skb_peek(&sk->sk_error_queue); 453 if (skb2 != NULL) { 454 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 455 spin_unlock_bh(&sk->sk_error_queue.lock); 456 sk->sk_error_report(sk); 457 } else 458 spin_unlock_bh(&sk->sk_error_queue.lock); 459 460 out_free_skb: 461 kfree_skb(skb); 462 out: 463 return err; 464 } 465 466 467 /* 468 * Socket option code for IP. This is the end of the line after any 469 * TCP,UDP etc options on an IP socket. 470 */ 471 472 static int do_ip_setsockopt(struct sock *sk, int level, 473 int optname, char __user *optval, unsigned int optlen) 474 { 475 struct inet_sock *inet = inet_sk(sk); 476 int val = 0, err; 477 478 switch (optname) { 479 case IP_PKTINFO: 480 case IP_RECVTTL: 481 case IP_RECVOPTS: 482 case IP_RECVTOS: 483 case IP_RETOPTS: 484 case IP_TOS: 485 case IP_TTL: 486 case IP_HDRINCL: 487 case IP_MTU_DISCOVER: 488 case IP_RECVERR: 489 case IP_ROUTER_ALERT: 490 case IP_FREEBIND: 491 case IP_PASSSEC: 492 case IP_TRANSPARENT: 493 case IP_MINTTL: 494 case IP_NODEFRAG: 495 case IP_UNICAST_IF: 496 case IP_MULTICAST_TTL: 497 case IP_MULTICAST_ALL: 498 case IP_MULTICAST_LOOP: 499 case IP_RECVORIGDSTADDR: 500 if (optlen >= sizeof(int)) { 501 if (get_user(val, (int __user *) optval)) 502 return -EFAULT; 503 } else if (optlen >= sizeof(char)) { 504 unsigned char ucval; 505 506 if (get_user(ucval, (unsigned char __user *) optval)) 507 return -EFAULT; 508 val = (int) ucval; 509 } 510 } 511 512 /* If optlen==0, it is equivalent to val == 0 */ 513 514 if (ip_mroute_opt(optname)) 515 return ip_mroute_setsockopt(sk, optname, optval, optlen); 516 517 err = 0; 518 lock_sock(sk); 519 520 switch (optname) { 521 case IP_OPTIONS: 522 { 523 struct ip_options_rcu *old, *opt = NULL; 524 525 if (optlen > 40) 526 goto e_inval; 527 err = ip_options_get_from_user(sock_net(sk), &opt, 528 optval, optlen); 529 if (err) 530 break; 531 old = rcu_dereference_protected(inet->inet_opt, 532 sock_owned_by_user(sk)); 533 if (inet->is_icsk) { 534 struct inet_connection_sock *icsk = inet_csk(sk); 535 #if IS_ENABLED(CONFIG_IPV6) 536 if (sk->sk_family == PF_INET || 537 (!((1 << sk->sk_state) & 538 (TCPF_LISTEN | TCPF_CLOSE)) && 539 inet->inet_daddr != LOOPBACK4_IPV6)) { 540 #endif 541 if (old) 542 icsk->icsk_ext_hdr_len -= old->opt.optlen; 543 if (opt) 544 icsk->icsk_ext_hdr_len += opt->opt.optlen; 545 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 546 #if IS_ENABLED(CONFIG_IPV6) 547 } 548 #endif 549 } 550 rcu_assign_pointer(inet->inet_opt, opt); 551 if (old) 552 kfree_rcu(old, rcu); 553 break; 554 } 555 case IP_PKTINFO: 556 if (val) 557 inet->cmsg_flags |= IP_CMSG_PKTINFO; 558 else 559 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 560 break; 561 case IP_RECVTTL: 562 if (val) 563 inet->cmsg_flags |= IP_CMSG_TTL; 564 else 565 inet->cmsg_flags &= ~IP_CMSG_TTL; 566 break; 567 case IP_RECVTOS: 568 if (val) 569 inet->cmsg_flags |= IP_CMSG_TOS; 570 else 571 inet->cmsg_flags &= ~IP_CMSG_TOS; 572 break; 573 case IP_RECVOPTS: 574 if (val) 575 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 576 else 577 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 578 break; 579 case IP_RETOPTS: 580 if (val) 581 inet->cmsg_flags |= IP_CMSG_RETOPTS; 582 else 583 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 584 break; 585 case IP_PASSSEC: 586 if (val) 587 inet->cmsg_flags |= IP_CMSG_PASSSEC; 588 else 589 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 590 break; 591 case IP_RECVORIGDSTADDR: 592 if (val) 593 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 594 else 595 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 596 break; 597 case IP_TOS: /* This sets both TOS and Precedence */ 598 if (sk->sk_type == SOCK_STREAM) { 599 val &= ~INET_ECN_MASK; 600 val |= inet->tos & INET_ECN_MASK; 601 } 602 if (inet->tos != val) { 603 inet->tos = val; 604 sk->sk_priority = rt_tos2priority(val); 605 sk_dst_reset(sk); 606 } 607 break; 608 case IP_TTL: 609 if (optlen < 1) 610 goto e_inval; 611 if (val != -1 && (val < 1 || val > 255)) 612 goto e_inval; 613 inet->uc_ttl = val; 614 break; 615 case IP_HDRINCL: 616 if (sk->sk_type != SOCK_RAW) { 617 err = -ENOPROTOOPT; 618 break; 619 } 620 inet->hdrincl = val ? 1 : 0; 621 break; 622 case IP_NODEFRAG: 623 if (sk->sk_type != SOCK_RAW) { 624 err = -ENOPROTOOPT; 625 break; 626 } 627 inet->nodefrag = val ? 1 : 0; 628 break; 629 case IP_MTU_DISCOVER: 630 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_INTERFACE) 631 goto e_inval; 632 inet->pmtudisc = val; 633 break; 634 case IP_RECVERR: 635 inet->recverr = !!val; 636 if (!val) 637 skb_queue_purge(&sk->sk_error_queue); 638 break; 639 case IP_MULTICAST_TTL: 640 if (sk->sk_type == SOCK_STREAM) 641 goto e_inval; 642 if (optlen < 1) 643 goto e_inval; 644 if (val == -1) 645 val = 1; 646 if (val < 0 || val > 255) 647 goto e_inval; 648 inet->mc_ttl = val; 649 break; 650 case IP_MULTICAST_LOOP: 651 if (optlen < 1) 652 goto e_inval; 653 inet->mc_loop = !!val; 654 break; 655 case IP_UNICAST_IF: 656 { 657 struct net_device *dev = NULL; 658 int ifindex; 659 660 if (optlen != sizeof(int)) 661 goto e_inval; 662 663 ifindex = (__force int)ntohl((__force __be32)val); 664 if (ifindex == 0) { 665 inet->uc_index = 0; 666 err = 0; 667 break; 668 } 669 670 dev = dev_get_by_index(sock_net(sk), ifindex); 671 err = -EADDRNOTAVAIL; 672 if (!dev) 673 break; 674 dev_put(dev); 675 676 err = -EINVAL; 677 if (sk->sk_bound_dev_if) 678 break; 679 680 inet->uc_index = ifindex; 681 err = 0; 682 break; 683 } 684 case IP_MULTICAST_IF: 685 { 686 struct ip_mreqn mreq; 687 struct net_device *dev = NULL; 688 689 if (sk->sk_type == SOCK_STREAM) 690 goto e_inval; 691 /* 692 * Check the arguments are allowable 693 */ 694 695 if (optlen < sizeof(struct in_addr)) 696 goto e_inval; 697 698 err = -EFAULT; 699 if (optlen >= sizeof(struct ip_mreqn)) { 700 if (copy_from_user(&mreq, optval, sizeof(mreq))) 701 break; 702 } else { 703 memset(&mreq, 0, sizeof(mreq)); 704 if (optlen >= sizeof(struct ip_mreq)) { 705 if (copy_from_user(&mreq, optval, 706 sizeof(struct ip_mreq))) 707 break; 708 } else if (optlen >= sizeof(struct in_addr)) { 709 if (copy_from_user(&mreq.imr_address, optval, 710 sizeof(struct in_addr))) 711 break; 712 } 713 } 714 715 if (!mreq.imr_ifindex) { 716 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 717 inet->mc_index = 0; 718 inet->mc_addr = 0; 719 err = 0; 720 break; 721 } 722 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 723 if (dev) 724 mreq.imr_ifindex = dev->ifindex; 725 } else 726 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 727 728 729 err = -EADDRNOTAVAIL; 730 if (!dev) 731 break; 732 dev_put(dev); 733 734 err = -EINVAL; 735 if (sk->sk_bound_dev_if && 736 mreq.imr_ifindex != sk->sk_bound_dev_if) 737 break; 738 739 inet->mc_index = mreq.imr_ifindex; 740 inet->mc_addr = mreq.imr_address.s_addr; 741 err = 0; 742 break; 743 } 744 745 case IP_ADD_MEMBERSHIP: 746 case IP_DROP_MEMBERSHIP: 747 { 748 struct ip_mreqn mreq; 749 750 err = -EPROTO; 751 if (inet_sk(sk)->is_icsk) 752 break; 753 754 if (optlen < sizeof(struct ip_mreq)) 755 goto e_inval; 756 err = -EFAULT; 757 if (optlen >= sizeof(struct ip_mreqn)) { 758 if (copy_from_user(&mreq, optval, sizeof(mreq))) 759 break; 760 } else { 761 memset(&mreq, 0, sizeof(mreq)); 762 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 763 break; 764 } 765 766 if (optname == IP_ADD_MEMBERSHIP) 767 err = ip_mc_join_group(sk, &mreq); 768 else 769 err = ip_mc_leave_group(sk, &mreq); 770 break; 771 } 772 case IP_MSFILTER: 773 { 774 struct ip_msfilter *msf; 775 776 if (optlen < IP_MSFILTER_SIZE(0)) 777 goto e_inval; 778 if (optlen > sysctl_optmem_max) { 779 err = -ENOBUFS; 780 break; 781 } 782 msf = kmalloc(optlen, GFP_KERNEL); 783 if (!msf) { 784 err = -ENOBUFS; 785 break; 786 } 787 err = -EFAULT; 788 if (copy_from_user(msf, optval, optlen)) { 789 kfree(msf); 790 break; 791 } 792 /* numsrc >= (1G-4) overflow in 32 bits */ 793 if (msf->imsf_numsrc >= 0x3ffffffcU || 794 msf->imsf_numsrc > sysctl_igmp_max_msf) { 795 kfree(msf); 796 err = -ENOBUFS; 797 break; 798 } 799 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 800 kfree(msf); 801 err = -EINVAL; 802 break; 803 } 804 err = ip_mc_msfilter(sk, msf, 0); 805 kfree(msf); 806 break; 807 } 808 case IP_BLOCK_SOURCE: 809 case IP_UNBLOCK_SOURCE: 810 case IP_ADD_SOURCE_MEMBERSHIP: 811 case IP_DROP_SOURCE_MEMBERSHIP: 812 { 813 struct ip_mreq_source mreqs; 814 int omode, add; 815 816 if (optlen != sizeof(struct ip_mreq_source)) 817 goto e_inval; 818 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 819 err = -EFAULT; 820 break; 821 } 822 if (optname == IP_BLOCK_SOURCE) { 823 omode = MCAST_EXCLUDE; 824 add = 1; 825 } else if (optname == IP_UNBLOCK_SOURCE) { 826 omode = MCAST_EXCLUDE; 827 add = 0; 828 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 829 struct ip_mreqn mreq; 830 831 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 832 mreq.imr_address.s_addr = mreqs.imr_interface; 833 mreq.imr_ifindex = 0; 834 err = ip_mc_join_group(sk, &mreq); 835 if (err && err != -EADDRINUSE) 836 break; 837 omode = MCAST_INCLUDE; 838 add = 1; 839 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 840 omode = MCAST_INCLUDE; 841 add = 0; 842 } 843 err = ip_mc_source(add, omode, sk, &mreqs, 0); 844 break; 845 } 846 case MCAST_JOIN_GROUP: 847 case MCAST_LEAVE_GROUP: 848 { 849 struct group_req greq; 850 struct sockaddr_in *psin; 851 struct ip_mreqn mreq; 852 853 if (optlen < sizeof(struct group_req)) 854 goto e_inval; 855 err = -EFAULT; 856 if (copy_from_user(&greq, optval, sizeof(greq))) 857 break; 858 psin = (struct sockaddr_in *)&greq.gr_group; 859 if (psin->sin_family != AF_INET) 860 goto e_inval; 861 memset(&mreq, 0, sizeof(mreq)); 862 mreq.imr_multiaddr = psin->sin_addr; 863 mreq.imr_ifindex = greq.gr_interface; 864 865 if (optname == MCAST_JOIN_GROUP) 866 err = ip_mc_join_group(sk, &mreq); 867 else 868 err = ip_mc_leave_group(sk, &mreq); 869 break; 870 } 871 case MCAST_JOIN_SOURCE_GROUP: 872 case MCAST_LEAVE_SOURCE_GROUP: 873 case MCAST_BLOCK_SOURCE: 874 case MCAST_UNBLOCK_SOURCE: 875 { 876 struct group_source_req greqs; 877 struct ip_mreq_source mreqs; 878 struct sockaddr_in *psin; 879 int omode, add; 880 881 if (optlen != sizeof(struct group_source_req)) 882 goto e_inval; 883 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 884 err = -EFAULT; 885 break; 886 } 887 if (greqs.gsr_group.ss_family != AF_INET || 888 greqs.gsr_source.ss_family != AF_INET) { 889 err = -EADDRNOTAVAIL; 890 break; 891 } 892 psin = (struct sockaddr_in *)&greqs.gsr_group; 893 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 894 psin = (struct sockaddr_in *)&greqs.gsr_source; 895 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 896 mreqs.imr_interface = 0; /* use index for mc_source */ 897 898 if (optname == MCAST_BLOCK_SOURCE) { 899 omode = MCAST_EXCLUDE; 900 add = 1; 901 } else if (optname == MCAST_UNBLOCK_SOURCE) { 902 omode = MCAST_EXCLUDE; 903 add = 0; 904 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 905 struct ip_mreqn mreq; 906 907 psin = (struct sockaddr_in *)&greqs.gsr_group; 908 mreq.imr_multiaddr = psin->sin_addr; 909 mreq.imr_address.s_addr = 0; 910 mreq.imr_ifindex = greqs.gsr_interface; 911 err = ip_mc_join_group(sk, &mreq); 912 if (err && err != -EADDRINUSE) 913 break; 914 greqs.gsr_interface = mreq.imr_ifindex; 915 omode = MCAST_INCLUDE; 916 add = 1; 917 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 918 omode = MCAST_INCLUDE; 919 add = 0; 920 } 921 err = ip_mc_source(add, omode, sk, &mreqs, 922 greqs.gsr_interface); 923 break; 924 } 925 case MCAST_MSFILTER: 926 { 927 struct sockaddr_in *psin; 928 struct ip_msfilter *msf = NULL; 929 struct group_filter *gsf = NULL; 930 int msize, i, ifindex; 931 932 if (optlen < GROUP_FILTER_SIZE(0)) 933 goto e_inval; 934 if (optlen > sysctl_optmem_max) { 935 err = -ENOBUFS; 936 break; 937 } 938 gsf = kmalloc(optlen, GFP_KERNEL); 939 if (!gsf) { 940 err = -ENOBUFS; 941 break; 942 } 943 err = -EFAULT; 944 if (copy_from_user(gsf, optval, optlen)) 945 goto mc_msf_out; 946 947 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 948 if (gsf->gf_numsrc >= 0x1ffffff || 949 gsf->gf_numsrc > sysctl_igmp_max_msf) { 950 err = -ENOBUFS; 951 goto mc_msf_out; 952 } 953 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 954 err = -EINVAL; 955 goto mc_msf_out; 956 } 957 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 958 msf = kmalloc(msize, GFP_KERNEL); 959 if (!msf) { 960 err = -ENOBUFS; 961 goto mc_msf_out; 962 } 963 ifindex = gsf->gf_interface; 964 psin = (struct sockaddr_in *)&gsf->gf_group; 965 if (psin->sin_family != AF_INET) { 966 err = -EADDRNOTAVAIL; 967 goto mc_msf_out; 968 } 969 msf->imsf_multiaddr = psin->sin_addr.s_addr; 970 msf->imsf_interface = 0; 971 msf->imsf_fmode = gsf->gf_fmode; 972 msf->imsf_numsrc = gsf->gf_numsrc; 973 err = -EADDRNOTAVAIL; 974 for (i = 0; i < gsf->gf_numsrc; ++i) { 975 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 976 977 if (psin->sin_family != AF_INET) 978 goto mc_msf_out; 979 msf->imsf_slist[i] = psin->sin_addr.s_addr; 980 } 981 kfree(gsf); 982 gsf = NULL; 983 984 err = ip_mc_msfilter(sk, msf, ifindex); 985 mc_msf_out: 986 kfree(msf); 987 kfree(gsf); 988 break; 989 } 990 case IP_MULTICAST_ALL: 991 if (optlen < 1) 992 goto e_inval; 993 if (val != 0 && val != 1) 994 goto e_inval; 995 inet->mc_all = val; 996 break; 997 case IP_ROUTER_ALERT: 998 err = ip_ra_control(sk, val ? 1 : 0, NULL); 999 break; 1000 1001 case IP_FREEBIND: 1002 if (optlen < 1) 1003 goto e_inval; 1004 inet->freebind = !!val; 1005 break; 1006 1007 case IP_IPSEC_POLICY: 1008 case IP_XFRM_POLICY: 1009 err = -EPERM; 1010 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1011 break; 1012 err = xfrm_user_policy(sk, optname, optval, optlen); 1013 break; 1014 1015 case IP_TRANSPARENT: 1016 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1017 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1018 err = -EPERM; 1019 break; 1020 } 1021 if (optlen < 1) 1022 goto e_inval; 1023 inet->transparent = !!val; 1024 break; 1025 1026 case IP_MINTTL: 1027 if (optlen < 1) 1028 goto e_inval; 1029 if (val < 0 || val > 255) 1030 goto e_inval; 1031 inet->min_ttl = val; 1032 break; 1033 1034 default: 1035 err = -ENOPROTOOPT; 1036 break; 1037 } 1038 release_sock(sk); 1039 return err; 1040 1041 e_inval: 1042 release_sock(sk); 1043 return -EINVAL; 1044 } 1045 1046 /** 1047 * ipv4_pktinfo_prepare - transfert some info from rtable to skb 1048 * @sk: socket 1049 * @skb: buffer 1050 * 1051 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1052 * destination in skb->cb[] before dst drop. 1053 * This way, receiver doesnt make cache line misses to read rtable. 1054 */ 1055 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1056 { 1057 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1058 1059 if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) && 1060 skb_rtable(skb)) { 1061 pktinfo->ipi_ifindex = inet_iif(skb); 1062 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1063 } else { 1064 pktinfo->ipi_ifindex = 0; 1065 pktinfo->ipi_spec_dst.s_addr = 0; 1066 } 1067 skb_dst_drop(skb); 1068 } 1069 1070 int ip_setsockopt(struct sock *sk, int level, 1071 int optname, char __user *optval, unsigned int optlen) 1072 { 1073 int err; 1074 1075 if (level != SOL_IP) 1076 return -ENOPROTOOPT; 1077 1078 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1079 #ifdef CONFIG_NETFILTER 1080 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1081 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1082 optname != IP_IPSEC_POLICY && 1083 optname != IP_XFRM_POLICY && 1084 !ip_mroute_opt(optname)) { 1085 lock_sock(sk); 1086 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1087 release_sock(sk); 1088 } 1089 #endif 1090 return err; 1091 } 1092 EXPORT_SYMBOL(ip_setsockopt); 1093 1094 #ifdef CONFIG_COMPAT 1095 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1096 char __user *optval, unsigned int optlen) 1097 { 1098 int err; 1099 1100 if (level != SOL_IP) 1101 return -ENOPROTOOPT; 1102 1103 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1104 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1105 ip_setsockopt); 1106 1107 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1108 #ifdef CONFIG_NETFILTER 1109 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1110 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1111 optname != IP_IPSEC_POLICY && 1112 optname != IP_XFRM_POLICY && 1113 !ip_mroute_opt(optname)) { 1114 lock_sock(sk); 1115 err = compat_nf_setsockopt(sk, PF_INET, optname, 1116 optval, optlen); 1117 release_sock(sk); 1118 } 1119 #endif 1120 return err; 1121 } 1122 EXPORT_SYMBOL(compat_ip_setsockopt); 1123 #endif 1124 1125 /* 1126 * Get the options. Note for future reference. The GET of IP options gets 1127 * the _received_ ones. The set sets the _sent_ ones. 1128 */ 1129 1130 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1131 char __user *optval, int __user *optlen, unsigned int flags) 1132 { 1133 struct inet_sock *inet = inet_sk(sk); 1134 int val; 1135 int len; 1136 1137 if (level != SOL_IP) 1138 return -EOPNOTSUPP; 1139 1140 if (ip_mroute_opt(optname)) 1141 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1142 1143 if (get_user(len, optlen)) 1144 return -EFAULT; 1145 if (len < 0) 1146 return -EINVAL; 1147 1148 lock_sock(sk); 1149 1150 switch (optname) { 1151 case IP_OPTIONS: 1152 { 1153 unsigned char optbuf[sizeof(struct ip_options)+40]; 1154 struct ip_options *opt = (struct ip_options *)optbuf; 1155 struct ip_options_rcu *inet_opt; 1156 1157 inet_opt = rcu_dereference_protected(inet->inet_opt, 1158 sock_owned_by_user(sk)); 1159 opt->optlen = 0; 1160 if (inet_opt) 1161 memcpy(optbuf, &inet_opt->opt, 1162 sizeof(struct ip_options) + 1163 inet_opt->opt.optlen); 1164 release_sock(sk); 1165 1166 if (opt->optlen == 0) 1167 return put_user(0, optlen); 1168 1169 ip_options_undo(opt); 1170 1171 len = min_t(unsigned int, len, opt->optlen); 1172 if (put_user(len, optlen)) 1173 return -EFAULT; 1174 if (copy_to_user(optval, opt->__data, len)) 1175 return -EFAULT; 1176 return 0; 1177 } 1178 case IP_PKTINFO: 1179 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1180 break; 1181 case IP_RECVTTL: 1182 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1183 break; 1184 case IP_RECVTOS: 1185 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1186 break; 1187 case IP_RECVOPTS: 1188 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1189 break; 1190 case IP_RETOPTS: 1191 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1192 break; 1193 case IP_PASSSEC: 1194 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1195 break; 1196 case IP_RECVORIGDSTADDR: 1197 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1198 break; 1199 case IP_TOS: 1200 val = inet->tos; 1201 break; 1202 case IP_TTL: 1203 val = (inet->uc_ttl == -1 ? 1204 sysctl_ip_default_ttl : 1205 inet->uc_ttl); 1206 break; 1207 case IP_HDRINCL: 1208 val = inet->hdrincl; 1209 break; 1210 case IP_NODEFRAG: 1211 val = inet->nodefrag; 1212 break; 1213 case IP_MTU_DISCOVER: 1214 val = inet->pmtudisc; 1215 break; 1216 case IP_MTU: 1217 { 1218 struct dst_entry *dst; 1219 val = 0; 1220 dst = sk_dst_get(sk); 1221 if (dst) { 1222 val = dst_mtu(dst); 1223 dst_release(dst); 1224 } 1225 if (!val) { 1226 release_sock(sk); 1227 return -ENOTCONN; 1228 } 1229 break; 1230 } 1231 case IP_RECVERR: 1232 val = inet->recverr; 1233 break; 1234 case IP_MULTICAST_TTL: 1235 val = inet->mc_ttl; 1236 break; 1237 case IP_MULTICAST_LOOP: 1238 val = inet->mc_loop; 1239 break; 1240 case IP_UNICAST_IF: 1241 val = (__force int)htonl((__u32) inet->uc_index); 1242 break; 1243 case IP_MULTICAST_IF: 1244 { 1245 struct in_addr addr; 1246 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1247 addr.s_addr = inet->mc_addr; 1248 release_sock(sk); 1249 1250 if (put_user(len, optlen)) 1251 return -EFAULT; 1252 if (copy_to_user(optval, &addr, len)) 1253 return -EFAULT; 1254 return 0; 1255 } 1256 case IP_MSFILTER: 1257 { 1258 struct ip_msfilter msf; 1259 int err; 1260 1261 if (len < IP_MSFILTER_SIZE(0)) { 1262 release_sock(sk); 1263 return -EINVAL; 1264 } 1265 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1266 release_sock(sk); 1267 return -EFAULT; 1268 } 1269 err = ip_mc_msfget(sk, &msf, 1270 (struct ip_msfilter __user *)optval, optlen); 1271 release_sock(sk); 1272 return err; 1273 } 1274 case MCAST_MSFILTER: 1275 { 1276 struct group_filter gsf; 1277 int err; 1278 1279 if (len < GROUP_FILTER_SIZE(0)) { 1280 release_sock(sk); 1281 return -EINVAL; 1282 } 1283 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1284 release_sock(sk); 1285 return -EFAULT; 1286 } 1287 err = ip_mc_gsfget(sk, &gsf, 1288 (struct group_filter __user *)optval, 1289 optlen); 1290 release_sock(sk); 1291 return err; 1292 } 1293 case IP_MULTICAST_ALL: 1294 val = inet->mc_all; 1295 break; 1296 case IP_PKTOPTIONS: 1297 { 1298 struct msghdr msg; 1299 1300 release_sock(sk); 1301 1302 if (sk->sk_type != SOCK_STREAM) 1303 return -ENOPROTOOPT; 1304 1305 msg.msg_control = optval; 1306 msg.msg_controllen = len; 1307 msg.msg_flags = flags; 1308 1309 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1310 struct in_pktinfo info; 1311 1312 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1313 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1314 info.ipi_ifindex = inet->mc_index; 1315 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1316 } 1317 if (inet->cmsg_flags & IP_CMSG_TTL) { 1318 int hlim = inet->mc_ttl; 1319 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1320 } 1321 if (inet->cmsg_flags & IP_CMSG_TOS) { 1322 int tos = inet->rcv_tos; 1323 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1324 } 1325 len -= msg.msg_controllen; 1326 return put_user(len, optlen); 1327 } 1328 case IP_FREEBIND: 1329 val = inet->freebind; 1330 break; 1331 case IP_TRANSPARENT: 1332 val = inet->transparent; 1333 break; 1334 case IP_MINTTL: 1335 val = inet->min_ttl; 1336 break; 1337 default: 1338 release_sock(sk); 1339 return -ENOPROTOOPT; 1340 } 1341 release_sock(sk); 1342 1343 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1344 unsigned char ucval = (unsigned char)val; 1345 len = 1; 1346 if (put_user(len, optlen)) 1347 return -EFAULT; 1348 if (copy_to_user(optval, &ucval, 1)) 1349 return -EFAULT; 1350 } else { 1351 len = min_t(unsigned int, sizeof(int), len); 1352 if (put_user(len, optlen)) 1353 return -EFAULT; 1354 if (copy_to_user(optval, &val, len)) 1355 return -EFAULT; 1356 } 1357 return 0; 1358 } 1359 1360 int ip_getsockopt(struct sock *sk, int level, 1361 int optname, char __user *optval, int __user *optlen) 1362 { 1363 int err; 1364 1365 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1366 #ifdef CONFIG_NETFILTER 1367 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1368 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1369 !ip_mroute_opt(optname)) { 1370 int len; 1371 1372 if (get_user(len, optlen)) 1373 return -EFAULT; 1374 1375 lock_sock(sk); 1376 err = nf_getsockopt(sk, PF_INET, optname, optval, 1377 &len); 1378 release_sock(sk); 1379 if (err >= 0) 1380 err = put_user(len, optlen); 1381 return err; 1382 } 1383 #endif 1384 return err; 1385 } 1386 EXPORT_SYMBOL(ip_getsockopt); 1387 1388 #ifdef CONFIG_COMPAT 1389 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1390 char __user *optval, int __user *optlen) 1391 { 1392 int err; 1393 1394 if (optname == MCAST_MSFILTER) 1395 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1396 ip_getsockopt); 1397 1398 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1399 MSG_CMSG_COMPAT); 1400 1401 #ifdef CONFIG_NETFILTER 1402 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1403 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1404 !ip_mroute_opt(optname)) { 1405 int len; 1406 1407 if (get_user(len, optlen)) 1408 return -EFAULT; 1409 1410 lock_sock(sk); 1411 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1412 release_sock(sk); 1413 if (err >= 0) 1414 err = put_user(len, optlen); 1415 return err; 1416 } 1417 #endif 1418 return err; 1419 } 1420 EXPORT_SYMBOL(compat_ip_getsockopt); 1421 #endif 1422