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, int *addr_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 *addr_len = sizeof(*sin); 427 } 428 429 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 430 sin = &errhdr.offender; 431 sin->sin_family = AF_UNSPEC; 432 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 433 struct inet_sock *inet = inet_sk(sk); 434 435 sin->sin_family = AF_INET; 436 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 437 sin->sin_port = 0; 438 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 439 if (inet->cmsg_flags) 440 ip_cmsg_recv(msg, skb); 441 } 442 443 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 444 445 /* Now we could try to dump offended packet options */ 446 447 msg->msg_flags |= MSG_ERRQUEUE; 448 err = copied; 449 450 /* Reset and regenerate socket error */ 451 spin_lock_bh(&sk->sk_error_queue.lock); 452 sk->sk_err = 0; 453 skb2 = skb_peek(&sk->sk_error_queue); 454 if (skb2 != NULL) { 455 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 456 spin_unlock_bh(&sk->sk_error_queue.lock); 457 sk->sk_error_report(sk); 458 } else 459 spin_unlock_bh(&sk->sk_error_queue.lock); 460 461 out_free_skb: 462 kfree_skb(skb); 463 out: 464 return err; 465 } 466 467 468 /* 469 * Socket option code for IP. This is the end of the line after any 470 * TCP,UDP etc options on an IP socket. 471 */ 472 473 static int do_ip_setsockopt(struct sock *sk, int level, 474 int optname, char __user *optval, unsigned int optlen) 475 { 476 struct inet_sock *inet = inet_sk(sk); 477 int val = 0, err; 478 479 switch (optname) { 480 case IP_PKTINFO: 481 case IP_RECVTTL: 482 case IP_RECVOPTS: 483 case IP_RECVTOS: 484 case IP_RETOPTS: 485 case IP_TOS: 486 case IP_TTL: 487 case IP_HDRINCL: 488 case IP_MTU_DISCOVER: 489 case IP_RECVERR: 490 case IP_ROUTER_ALERT: 491 case IP_FREEBIND: 492 case IP_PASSSEC: 493 case IP_TRANSPARENT: 494 case IP_MINTTL: 495 case IP_NODEFRAG: 496 case IP_UNICAST_IF: 497 case IP_MULTICAST_TTL: 498 case IP_MULTICAST_ALL: 499 case IP_MULTICAST_LOOP: 500 case IP_RECVORIGDSTADDR: 501 if (optlen >= sizeof(int)) { 502 if (get_user(val, (int __user *) optval)) 503 return -EFAULT; 504 } else if (optlen >= sizeof(char)) { 505 unsigned char ucval; 506 507 if (get_user(ucval, (unsigned char __user *) optval)) 508 return -EFAULT; 509 val = (int) ucval; 510 } 511 } 512 513 /* If optlen==0, it is equivalent to val == 0 */ 514 515 if (ip_mroute_opt(optname)) 516 return ip_mroute_setsockopt(sk, optname, optval, optlen); 517 518 err = 0; 519 lock_sock(sk); 520 521 switch (optname) { 522 case IP_OPTIONS: 523 { 524 struct ip_options_rcu *old, *opt = NULL; 525 526 if (optlen > 40) 527 goto e_inval; 528 err = ip_options_get_from_user(sock_net(sk), &opt, 529 optval, optlen); 530 if (err) 531 break; 532 old = rcu_dereference_protected(inet->inet_opt, 533 sock_owned_by_user(sk)); 534 if (inet->is_icsk) { 535 struct inet_connection_sock *icsk = inet_csk(sk); 536 #if IS_ENABLED(CONFIG_IPV6) 537 if (sk->sk_family == PF_INET || 538 (!((1 << sk->sk_state) & 539 (TCPF_LISTEN | TCPF_CLOSE)) && 540 inet->inet_daddr != LOOPBACK4_IPV6)) { 541 #endif 542 if (old) 543 icsk->icsk_ext_hdr_len -= old->opt.optlen; 544 if (opt) 545 icsk->icsk_ext_hdr_len += opt->opt.optlen; 546 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 547 #if IS_ENABLED(CONFIG_IPV6) 548 } 549 #endif 550 } 551 rcu_assign_pointer(inet->inet_opt, opt); 552 if (old) 553 kfree_rcu(old, rcu); 554 break; 555 } 556 case IP_PKTINFO: 557 if (val) 558 inet->cmsg_flags |= IP_CMSG_PKTINFO; 559 else 560 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 561 break; 562 case IP_RECVTTL: 563 if (val) 564 inet->cmsg_flags |= IP_CMSG_TTL; 565 else 566 inet->cmsg_flags &= ~IP_CMSG_TTL; 567 break; 568 case IP_RECVTOS: 569 if (val) 570 inet->cmsg_flags |= IP_CMSG_TOS; 571 else 572 inet->cmsg_flags &= ~IP_CMSG_TOS; 573 break; 574 case IP_RECVOPTS: 575 if (val) 576 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 577 else 578 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 579 break; 580 case IP_RETOPTS: 581 if (val) 582 inet->cmsg_flags |= IP_CMSG_RETOPTS; 583 else 584 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 585 break; 586 case IP_PASSSEC: 587 if (val) 588 inet->cmsg_flags |= IP_CMSG_PASSSEC; 589 else 590 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 591 break; 592 case IP_RECVORIGDSTADDR: 593 if (val) 594 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 595 else 596 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 597 break; 598 case IP_TOS: /* This sets both TOS and Precedence */ 599 if (sk->sk_type == SOCK_STREAM) { 600 val &= ~INET_ECN_MASK; 601 val |= inet->tos & INET_ECN_MASK; 602 } 603 if (inet->tos != val) { 604 inet->tos = val; 605 sk->sk_priority = rt_tos2priority(val); 606 sk_dst_reset(sk); 607 } 608 break; 609 case IP_TTL: 610 if (optlen < 1) 611 goto e_inval; 612 if (val != -1 && (val < 1 || val > 255)) 613 goto e_inval; 614 inet->uc_ttl = val; 615 break; 616 case IP_HDRINCL: 617 if (sk->sk_type != SOCK_RAW) { 618 err = -ENOPROTOOPT; 619 break; 620 } 621 inet->hdrincl = val ? 1 : 0; 622 break; 623 case IP_NODEFRAG: 624 if (sk->sk_type != SOCK_RAW) { 625 err = -ENOPROTOOPT; 626 break; 627 } 628 inet->nodefrag = val ? 1 : 0; 629 break; 630 case IP_MTU_DISCOVER: 631 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_INTERFACE) 632 goto e_inval; 633 inet->pmtudisc = val; 634 break; 635 case IP_RECVERR: 636 inet->recverr = !!val; 637 if (!val) 638 skb_queue_purge(&sk->sk_error_queue); 639 break; 640 case IP_MULTICAST_TTL: 641 if (sk->sk_type == SOCK_STREAM) 642 goto e_inval; 643 if (optlen < 1) 644 goto e_inval; 645 if (val == -1) 646 val = 1; 647 if (val < 0 || val > 255) 648 goto e_inval; 649 inet->mc_ttl = val; 650 break; 651 case IP_MULTICAST_LOOP: 652 if (optlen < 1) 653 goto e_inval; 654 inet->mc_loop = !!val; 655 break; 656 case IP_UNICAST_IF: 657 { 658 struct net_device *dev = NULL; 659 int ifindex; 660 661 if (optlen != sizeof(int)) 662 goto e_inval; 663 664 ifindex = (__force int)ntohl((__force __be32)val); 665 if (ifindex == 0) { 666 inet->uc_index = 0; 667 err = 0; 668 break; 669 } 670 671 dev = dev_get_by_index(sock_net(sk), ifindex); 672 err = -EADDRNOTAVAIL; 673 if (!dev) 674 break; 675 dev_put(dev); 676 677 err = -EINVAL; 678 if (sk->sk_bound_dev_if) 679 break; 680 681 inet->uc_index = ifindex; 682 err = 0; 683 break; 684 } 685 case IP_MULTICAST_IF: 686 { 687 struct ip_mreqn mreq; 688 struct net_device *dev = NULL; 689 690 if (sk->sk_type == SOCK_STREAM) 691 goto e_inval; 692 /* 693 * Check the arguments are allowable 694 */ 695 696 if (optlen < sizeof(struct in_addr)) 697 goto e_inval; 698 699 err = -EFAULT; 700 if (optlen >= sizeof(struct ip_mreqn)) { 701 if (copy_from_user(&mreq, optval, sizeof(mreq))) 702 break; 703 } else { 704 memset(&mreq, 0, sizeof(mreq)); 705 if (optlen >= sizeof(struct ip_mreq)) { 706 if (copy_from_user(&mreq, optval, 707 sizeof(struct ip_mreq))) 708 break; 709 } else if (optlen >= sizeof(struct in_addr)) { 710 if (copy_from_user(&mreq.imr_address, optval, 711 sizeof(struct in_addr))) 712 break; 713 } 714 } 715 716 if (!mreq.imr_ifindex) { 717 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 718 inet->mc_index = 0; 719 inet->mc_addr = 0; 720 err = 0; 721 break; 722 } 723 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 724 if (dev) 725 mreq.imr_ifindex = dev->ifindex; 726 } else 727 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 728 729 730 err = -EADDRNOTAVAIL; 731 if (!dev) 732 break; 733 dev_put(dev); 734 735 err = -EINVAL; 736 if (sk->sk_bound_dev_if && 737 mreq.imr_ifindex != sk->sk_bound_dev_if) 738 break; 739 740 inet->mc_index = mreq.imr_ifindex; 741 inet->mc_addr = mreq.imr_address.s_addr; 742 err = 0; 743 break; 744 } 745 746 case IP_ADD_MEMBERSHIP: 747 case IP_DROP_MEMBERSHIP: 748 { 749 struct ip_mreqn mreq; 750 751 err = -EPROTO; 752 if (inet_sk(sk)->is_icsk) 753 break; 754 755 if (optlen < sizeof(struct ip_mreq)) 756 goto e_inval; 757 err = -EFAULT; 758 if (optlen >= sizeof(struct ip_mreqn)) { 759 if (copy_from_user(&mreq, optval, sizeof(mreq))) 760 break; 761 } else { 762 memset(&mreq, 0, sizeof(mreq)); 763 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 764 break; 765 } 766 767 if (optname == IP_ADD_MEMBERSHIP) 768 err = ip_mc_join_group(sk, &mreq); 769 else 770 err = ip_mc_leave_group(sk, &mreq); 771 break; 772 } 773 case IP_MSFILTER: 774 { 775 struct ip_msfilter *msf; 776 777 if (optlen < IP_MSFILTER_SIZE(0)) 778 goto e_inval; 779 if (optlen > sysctl_optmem_max) { 780 err = -ENOBUFS; 781 break; 782 } 783 msf = kmalloc(optlen, GFP_KERNEL); 784 if (!msf) { 785 err = -ENOBUFS; 786 break; 787 } 788 err = -EFAULT; 789 if (copy_from_user(msf, optval, optlen)) { 790 kfree(msf); 791 break; 792 } 793 /* numsrc >= (1G-4) overflow in 32 bits */ 794 if (msf->imsf_numsrc >= 0x3ffffffcU || 795 msf->imsf_numsrc > sysctl_igmp_max_msf) { 796 kfree(msf); 797 err = -ENOBUFS; 798 break; 799 } 800 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 801 kfree(msf); 802 err = -EINVAL; 803 break; 804 } 805 err = ip_mc_msfilter(sk, msf, 0); 806 kfree(msf); 807 break; 808 } 809 case IP_BLOCK_SOURCE: 810 case IP_UNBLOCK_SOURCE: 811 case IP_ADD_SOURCE_MEMBERSHIP: 812 case IP_DROP_SOURCE_MEMBERSHIP: 813 { 814 struct ip_mreq_source mreqs; 815 int omode, add; 816 817 if (optlen != sizeof(struct ip_mreq_source)) 818 goto e_inval; 819 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 820 err = -EFAULT; 821 break; 822 } 823 if (optname == IP_BLOCK_SOURCE) { 824 omode = MCAST_EXCLUDE; 825 add = 1; 826 } else if (optname == IP_UNBLOCK_SOURCE) { 827 omode = MCAST_EXCLUDE; 828 add = 0; 829 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 830 struct ip_mreqn mreq; 831 832 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 833 mreq.imr_address.s_addr = mreqs.imr_interface; 834 mreq.imr_ifindex = 0; 835 err = ip_mc_join_group(sk, &mreq); 836 if (err && err != -EADDRINUSE) 837 break; 838 omode = MCAST_INCLUDE; 839 add = 1; 840 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 841 omode = MCAST_INCLUDE; 842 add = 0; 843 } 844 err = ip_mc_source(add, omode, sk, &mreqs, 0); 845 break; 846 } 847 case MCAST_JOIN_GROUP: 848 case MCAST_LEAVE_GROUP: 849 { 850 struct group_req greq; 851 struct sockaddr_in *psin; 852 struct ip_mreqn mreq; 853 854 if (optlen < sizeof(struct group_req)) 855 goto e_inval; 856 err = -EFAULT; 857 if (copy_from_user(&greq, optval, sizeof(greq))) 858 break; 859 psin = (struct sockaddr_in *)&greq.gr_group; 860 if (psin->sin_family != AF_INET) 861 goto e_inval; 862 memset(&mreq, 0, sizeof(mreq)); 863 mreq.imr_multiaddr = psin->sin_addr; 864 mreq.imr_ifindex = greq.gr_interface; 865 866 if (optname == MCAST_JOIN_GROUP) 867 err = ip_mc_join_group(sk, &mreq); 868 else 869 err = ip_mc_leave_group(sk, &mreq); 870 break; 871 } 872 case MCAST_JOIN_SOURCE_GROUP: 873 case MCAST_LEAVE_SOURCE_GROUP: 874 case MCAST_BLOCK_SOURCE: 875 case MCAST_UNBLOCK_SOURCE: 876 { 877 struct group_source_req greqs; 878 struct ip_mreq_source mreqs; 879 struct sockaddr_in *psin; 880 int omode, add; 881 882 if (optlen != sizeof(struct group_source_req)) 883 goto e_inval; 884 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 885 err = -EFAULT; 886 break; 887 } 888 if (greqs.gsr_group.ss_family != AF_INET || 889 greqs.gsr_source.ss_family != AF_INET) { 890 err = -EADDRNOTAVAIL; 891 break; 892 } 893 psin = (struct sockaddr_in *)&greqs.gsr_group; 894 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 895 psin = (struct sockaddr_in *)&greqs.gsr_source; 896 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 897 mreqs.imr_interface = 0; /* use index for mc_source */ 898 899 if (optname == MCAST_BLOCK_SOURCE) { 900 omode = MCAST_EXCLUDE; 901 add = 1; 902 } else if (optname == MCAST_UNBLOCK_SOURCE) { 903 omode = MCAST_EXCLUDE; 904 add = 0; 905 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 906 struct ip_mreqn mreq; 907 908 psin = (struct sockaddr_in *)&greqs.gsr_group; 909 mreq.imr_multiaddr = psin->sin_addr; 910 mreq.imr_address.s_addr = 0; 911 mreq.imr_ifindex = greqs.gsr_interface; 912 err = ip_mc_join_group(sk, &mreq); 913 if (err && err != -EADDRINUSE) 914 break; 915 greqs.gsr_interface = mreq.imr_ifindex; 916 omode = MCAST_INCLUDE; 917 add = 1; 918 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 919 omode = MCAST_INCLUDE; 920 add = 0; 921 } 922 err = ip_mc_source(add, omode, sk, &mreqs, 923 greqs.gsr_interface); 924 break; 925 } 926 case MCAST_MSFILTER: 927 { 928 struct sockaddr_in *psin; 929 struct ip_msfilter *msf = NULL; 930 struct group_filter *gsf = NULL; 931 int msize, i, ifindex; 932 933 if (optlen < GROUP_FILTER_SIZE(0)) 934 goto e_inval; 935 if (optlen > sysctl_optmem_max) { 936 err = -ENOBUFS; 937 break; 938 } 939 gsf = kmalloc(optlen, GFP_KERNEL); 940 if (!gsf) { 941 err = -ENOBUFS; 942 break; 943 } 944 err = -EFAULT; 945 if (copy_from_user(gsf, optval, optlen)) 946 goto mc_msf_out; 947 948 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 949 if (gsf->gf_numsrc >= 0x1ffffff || 950 gsf->gf_numsrc > sysctl_igmp_max_msf) { 951 err = -ENOBUFS; 952 goto mc_msf_out; 953 } 954 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 955 err = -EINVAL; 956 goto mc_msf_out; 957 } 958 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 959 msf = kmalloc(msize, GFP_KERNEL); 960 if (!msf) { 961 err = -ENOBUFS; 962 goto mc_msf_out; 963 } 964 ifindex = gsf->gf_interface; 965 psin = (struct sockaddr_in *)&gsf->gf_group; 966 if (psin->sin_family != AF_INET) { 967 err = -EADDRNOTAVAIL; 968 goto mc_msf_out; 969 } 970 msf->imsf_multiaddr = psin->sin_addr.s_addr; 971 msf->imsf_interface = 0; 972 msf->imsf_fmode = gsf->gf_fmode; 973 msf->imsf_numsrc = gsf->gf_numsrc; 974 err = -EADDRNOTAVAIL; 975 for (i = 0; i < gsf->gf_numsrc; ++i) { 976 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 977 978 if (psin->sin_family != AF_INET) 979 goto mc_msf_out; 980 msf->imsf_slist[i] = psin->sin_addr.s_addr; 981 } 982 kfree(gsf); 983 gsf = NULL; 984 985 err = ip_mc_msfilter(sk, msf, ifindex); 986 mc_msf_out: 987 kfree(msf); 988 kfree(gsf); 989 break; 990 } 991 case IP_MULTICAST_ALL: 992 if (optlen < 1) 993 goto e_inval; 994 if (val != 0 && val != 1) 995 goto e_inval; 996 inet->mc_all = val; 997 break; 998 case IP_ROUTER_ALERT: 999 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1000 break; 1001 1002 case IP_FREEBIND: 1003 if (optlen < 1) 1004 goto e_inval; 1005 inet->freebind = !!val; 1006 break; 1007 1008 case IP_IPSEC_POLICY: 1009 case IP_XFRM_POLICY: 1010 err = -EPERM; 1011 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1012 break; 1013 err = xfrm_user_policy(sk, optname, optval, optlen); 1014 break; 1015 1016 case IP_TRANSPARENT: 1017 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1018 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1019 err = -EPERM; 1020 break; 1021 } 1022 if (optlen < 1) 1023 goto e_inval; 1024 inet->transparent = !!val; 1025 break; 1026 1027 case IP_MINTTL: 1028 if (optlen < 1) 1029 goto e_inval; 1030 if (val < 0 || val > 255) 1031 goto e_inval; 1032 inet->min_ttl = val; 1033 break; 1034 1035 default: 1036 err = -ENOPROTOOPT; 1037 break; 1038 } 1039 release_sock(sk); 1040 return err; 1041 1042 e_inval: 1043 release_sock(sk); 1044 return -EINVAL; 1045 } 1046 1047 /** 1048 * ipv4_pktinfo_prepare - transfert some info from rtable to skb 1049 * @sk: socket 1050 * @skb: buffer 1051 * 1052 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1053 * destination in skb->cb[] before dst drop. 1054 * This way, receiver doesnt make cache line misses to read rtable. 1055 */ 1056 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1057 { 1058 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1059 1060 if ((inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) && 1061 skb_rtable(skb)) { 1062 pktinfo->ipi_ifindex = inet_iif(skb); 1063 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1064 } else { 1065 pktinfo->ipi_ifindex = 0; 1066 pktinfo->ipi_spec_dst.s_addr = 0; 1067 } 1068 skb_dst_drop(skb); 1069 } 1070 1071 int ip_setsockopt(struct sock *sk, int level, 1072 int optname, char __user *optval, unsigned int optlen) 1073 { 1074 int err; 1075 1076 if (level != SOL_IP) 1077 return -ENOPROTOOPT; 1078 1079 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1080 #ifdef CONFIG_NETFILTER 1081 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1082 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1083 optname != IP_IPSEC_POLICY && 1084 optname != IP_XFRM_POLICY && 1085 !ip_mroute_opt(optname)) { 1086 lock_sock(sk); 1087 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1088 release_sock(sk); 1089 } 1090 #endif 1091 return err; 1092 } 1093 EXPORT_SYMBOL(ip_setsockopt); 1094 1095 #ifdef CONFIG_COMPAT 1096 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1097 char __user *optval, unsigned int optlen) 1098 { 1099 int err; 1100 1101 if (level != SOL_IP) 1102 return -ENOPROTOOPT; 1103 1104 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1105 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1106 ip_setsockopt); 1107 1108 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1109 #ifdef CONFIG_NETFILTER 1110 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1111 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1112 optname != IP_IPSEC_POLICY && 1113 optname != IP_XFRM_POLICY && 1114 !ip_mroute_opt(optname)) { 1115 lock_sock(sk); 1116 err = compat_nf_setsockopt(sk, PF_INET, optname, 1117 optval, optlen); 1118 release_sock(sk); 1119 } 1120 #endif 1121 return err; 1122 } 1123 EXPORT_SYMBOL(compat_ip_setsockopt); 1124 #endif 1125 1126 /* 1127 * Get the options. Note for future reference. The GET of IP options gets 1128 * the _received_ ones. The set sets the _sent_ ones. 1129 */ 1130 1131 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1132 char __user *optval, int __user *optlen, unsigned int flags) 1133 { 1134 struct inet_sock *inet = inet_sk(sk); 1135 int val; 1136 int len; 1137 1138 if (level != SOL_IP) 1139 return -EOPNOTSUPP; 1140 1141 if (ip_mroute_opt(optname)) 1142 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1143 1144 if (get_user(len, optlen)) 1145 return -EFAULT; 1146 if (len < 0) 1147 return -EINVAL; 1148 1149 lock_sock(sk); 1150 1151 switch (optname) { 1152 case IP_OPTIONS: 1153 { 1154 unsigned char optbuf[sizeof(struct ip_options)+40]; 1155 struct ip_options *opt = (struct ip_options *)optbuf; 1156 struct ip_options_rcu *inet_opt; 1157 1158 inet_opt = rcu_dereference_protected(inet->inet_opt, 1159 sock_owned_by_user(sk)); 1160 opt->optlen = 0; 1161 if (inet_opt) 1162 memcpy(optbuf, &inet_opt->opt, 1163 sizeof(struct ip_options) + 1164 inet_opt->opt.optlen); 1165 release_sock(sk); 1166 1167 if (opt->optlen == 0) 1168 return put_user(0, optlen); 1169 1170 ip_options_undo(opt); 1171 1172 len = min_t(unsigned int, len, opt->optlen); 1173 if (put_user(len, optlen)) 1174 return -EFAULT; 1175 if (copy_to_user(optval, opt->__data, len)) 1176 return -EFAULT; 1177 return 0; 1178 } 1179 case IP_PKTINFO: 1180 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1181 break; 1182 case IP_RECVTTL: 1183 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1184 break; 1185 case IP_RECVTOS: 1186 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1187 break; 1188 case IP_RECVOPTS: 1189 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1190 break; 1191 case IP_RETOPTS: 1192 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1193 break; 1194 case IP_PASSSEC: 1195 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1196 break; 1197 case IP_RECVORIGDSTADDR: 1198 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1199 break; 1200 case IP_TOS: 1201 val = inet->tos; 1202 break; 1203 case IP_TTL: 1204 val = (inet->uc_ttl == -1 ? 1205 sysctl_ip_default_ttl : 1206 inet->uc_ttl); 1207 break; 1208 case IP_HDRINCL: 1209 val = inet->hdrincl; 1210 break; 1211 case IP_NODEFRAG: 1212 val = inet->nodefrag; 1213 break; 1214 case IP_MTU_DISCOVER: 1215 val = inet->pmtudisc; 1216 break; 1217 case IP_MTU: 1218 { 1219 struct dst_entry *dst; 1220 val = 0; 1221 dst = sk_dst_get(sk); 1222 if (dst) { 1223 val = dst_mtu(dst); 1224 dst_release(dst); 1225 } 1226 if (!val) { 1227 release_sock(sk); 1228 return -ENOTCONN; 1229 } 1230 break; 1231 } 1232 case IP_RECVERR: 1233 val = inet->recverr; 1234 break; 1235 case IP_MULTICAST_TTL: 1236 val = inet->mc_ttl; 1237 break; 1238 case IP_MULTICAST_LOOP: 1239 val = inet->mc_loop; 1240 break; 1241 case IP_UNICAST_IF: 1242 val = (__force int)htonl((__u32) inet->uc_index); 1243 break; 1244 case IP_MULTICAST_IF: 1245 { 1246 struct in_addr addr; 1247 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1248 addr.s_addr = inet->mc_addr; 1249 release_sock(sk); 1250 1251 if (put_user(len, optlen)) 1252 return -EFAULT; 1253 if (copy_to_user(optval, &addr, len)) 1254 return -EFAULT; 1255 return 0; 1256 } 1257 case IP_MSFILTER: 1258 { 1259 struct ip_msfilter msf; 1260 int err; 1261 1262 if (len < IP_MSFILTER_SIZE(0)) { 1263 release_sock(sk); 1264 return -EINVAL; 1265 } 1266 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1267 release_sock(sk); 1268 return -EFAULT; 1269 } 1270 err = ip_mc_msfget(sk, &msf, 1271 (struct ip_msfilter __user *)optval, optlen); 1272 release_sock(sk); 1273 return err; 1274 } 1275 case MCAST_MSFILTER: 1276 { 1277 struct group_filter gsf; 1278 int err; 1279 1280 if (len < GROUP_FILTER_SIZE(0)) { 1281 release_sock(sk); 1282 return -EINVAL; 1283 } 1284 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1285 release_sock(sk); 1286 return -EFAULT; 1287 } 1288 err = ip_mc_gsfget(sk, &gsf, 1289 (struct group_filter __user *)optval, 1290 optlen); 1291 release_sock(sk); 1292 return err; 1293 } 1294 case IP_MULTICAST_ALL: 1295 val = inet->mc_all; 1296 break; 1297 case IP_PKTOPTIONS: 1298 { 1299 struct msghdr msg; 1300 1301 release_sock(sk); 1302 1303 if (sk->sk_type != SOCK_STREAM) 1304 return -ENOPROTOOPT; 1305 1306 msg.msg_control = optval; 1307 msg.msg_controllen = len; 1308 msg.msg_flags = flags; 1309 1310 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1311 struct in_pktinfo info; 1312 1313 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1314 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1315 info.ipi_ifindex = inet->mc_index; 1316 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1317 } 1318 if (inet->cmsg_flags & IP_CMSG_TTL) { 1319 int hlim = inet->mc_ttl; 1320 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1321 } 1322 if (inet->cmsg_flags & IP_CMSG_TOS) { 1323 int tos = inet->rcv_tos; 1324 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1325 } 1326 len -= msg.msg_controllen; 1327 return put_user(len, optlen); 1328 } 1329 case IP_FREEBIND: 1330 val = inet->freebind; 1331 break; 1332 case IP_TRANSPARENT: 1333 val = inet->transparent; 1334 break; 1335 case IP_MINTTL: 1336 val = inet->min_ttl; 1337 break; 1338 default: 1339 release_sock(sk); 1340 return -ENOPROTOOPT; 1341 } 1342 release_sock(sk); 1343 1344 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1345 unsigned char ucval = (unsigned char)val; 1346 len = 1; 1347 if (put_user(len, optlen)) 1348 return -EFAULT; 1349 if (copy_to_user(optval, &ucval, 1)) 1350 return -EFAULT; 1351 } else { 1352 len = min_t(unsigned int, sizeof(int), len); 1353 if (put_user(len, optlen)) 1354 return -EFAULT; 1355 if (copy_to_user(optval, &val, len)) 1356 return -EFAULT; 1357 } 1358 return 0; 1359 } 1360 1361 int ip_getsockopt(struct sock *sk, int level, 1362 int optname, char __user *optval, int __user *optlen) 1363 { 1364 int err; 1365 1366 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1367 #ifdef CONFIG_NETFILTER 1368 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1369 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1370 !ip_mroute_opt(optname)) { 1371 int len; 1372 1373 if (get_user(len, optlen)) 1374 return -EFAULT; 1375 1376 lock_sock(sk); 1377 err = nf_getsockopt(sk, PF_INET, optname, optval, 1378 &len); 1379 release_sock(sk); 1380 if (err >= 0) 1381 err = put_user(len, optlen); 1382 return err; 1383 } 1384 #endif 1385 return err; 1386 } 1387 EXPORT_SYMBOL(ip_getsockopt); 1388 1389 #ifdef CONFIG_COMPAT 1390 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1391 char __user *optval, int __user *optlen) 1392 { 1393 int err; 1394 1395 if (optname == MCAST_MSFILTER) 1396 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1397 ip_getsockopt); 1398 1399 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1400 MSG_CMSG_COMPAT); 1401 1402 #ifdef CONFIG_NETFILTER 1403 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1404 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1405 !ip_mroute_opt(optname)) { 1406 int len; 1407 1408 if (get_user(len, optlen)) 1409 return -EFAULT; 1410 1411 lock_sock(sk); 1412 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1413 release_sock(sk); 1414 if (err >= 0) 1415 err = put_user(len, optlen); 1416 return err; 1417 } 1418 #endif 1419 return err; 1420 } 1421 EXPORT_SYMBOL(compat_ip_getsockopt); 1422 #endif 1423