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 60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 61 { 62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 63 64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 65 66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 67 } 68 69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 70 { 71 int ttl = ip_hdr(skb)->ttl; 72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 73 } 74 75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 76 { 77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 78 } 79 80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 81 { 82 if (IPCB(skb)->opt.optlen == 0) 83 return; 84 85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 86 ip_hdr(skb) + 1); 87 } 88 89 90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 91 { 92 unsigned char optbuf[sizeof(struct ip_options) + 40]; 93 struct ip_options *opt = (struct ip_options *)optbuf; 94 95 if (IPCB(skb)->opt.optlen == 0) 96 return; 97 98 if (ip_options_echo(opt, skb)) { 99 msg->msg_flags |= MSG_CTRUNC; 100 return; 101 } 102 ip_options_undo(opt); 103 104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 105 } 106 107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 108 { 109 char *secdata; 110 u32 seclen, secid; 111 int err; 112 113 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 114 if (err) 115 return; 116 117 err = security_secid_to_secctx(secid, &secdata, &seclen); 118 if (err) 119 return; 120 121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 122 security_release_secctx(secdata, seclen); 123 } 124 125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 126 { 127 struct sockaddr_in sin; 128 const struct iphdr *iph = ip_hdr(skb); 129 __be16 *ports = (__be16 *)skb_transport_header(skb); 130 131 if (skb_transport_offset(skb) + 4 > skb->len) 132 return; 133 134 /* All current transport protocols have the port numbers in the 135 * first four bytes of the transport header and this function is 136 * written with this assumption in mind. 137 */ 138 139 sin.sin_family = AF_INET; 140 sin.sin_addr.s_addr = iph->daddr; 141 sin.sin_port = ports[1]; 142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 143 144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 145 } 146 147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 148 { 149 struct inet_sock *inet = inet_sk(skb->sk); 150 unsigned int flags = inet->cmsg_flags; 151 152 /* Ordered by supposed usage frequency */ 153 if (flags & 1) 154 ip_cmsg_recv_pktinfo(msg, skb); 155 if ((flags >>= 1) == 0) 156 return; 157 158 if (flags & 1) 159 ip_cmsg_recv_ttl(msg, skb); 160 if ((flags >>= 1) == 0) 161 return; 162 163 if (flags & 1) 164 ip_cmsg_recv_tos(msg, skb); 165 if ((flags >>= 1) == 0) 166 return; 167 168 if (flags & 1) 169 ip_cmsg_recv_opts(msg, skb); 170 if ((flags >>= 1) == 0) 171 return; 172 173 if (flags & 1) 174 ip_cmsg_recv_retopts(msg, skb); 175 if ((flags >>= 1) == 0) 176 return; 177 178 if (flags & 1) 179 ip_cmsg_recv_security(msg, skb); 180 181 if ((flags >>= 1) == 0) 182 return; 183 if (flags & 1) 184 ip_cmsg_recv_dstaddr(msg, skb); 185 186 } 187 EXPORT_SYMBOL(ip_cmsg_recv); 188 189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc) 190 { 191 int err, val; 192 struct cmsghdr *cmsg; 193 194 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) { 195 if (!CMSG_OK(msg, cmsg)) 196 return -EINVAL; 197 if (cmsg->cmsg_level != SOL_IP) 198 continue; 199 switch (cmsg->cmsg_type) { 200 case IP_RETOPTS: 201 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 202 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 203 err < 40 ? err : 40); 204 if (err) 205 return err; 206 break; 207 case IP_PKTINFO: 208 { 209 struct in_pktinfo *info; 210 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 211 return -EINVAL; 212 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 213 ipc->oif = info->ipi_ifindex; 214 ipc->addr = info->ipi_spec_dst.s_addr; 215 break; 216 } 217 case IP_TTL: 218 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 219 return -EINVAL; 220 val = *(int *)CMSG_DATA(cmsg); 221 if (val < 1 || val > 255) 222 return -EINVAL; 223 ipc->ttl = val; 224 break; 225 case IP_TOS: 226 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 227 return -EINVAL; 228 val = *(int *)CMSG_DATA(cmsg); 229 if (val < 0 || val > 255) 230 return -EINVAL; 231 ipc->tos = val; 232 ipc->priority = rt_tos2priority(ipc->tos); 233 break; 234 235 default: 236 return -EINVAL; 237 } 238 } 239 return 0; 240 } 241 242 243 /* Special input handler for packets caught by router alert option. 244 They are selected only by protocol field, and then processed likely 245 local ones; but only if someone wants them! Otherwise, router 246 not running rsvpd will kill RSVP. 247 248 It is user level problem, what it will make with them. 249 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 250 but receiver should be enough clever f.e. to forward mtrace requests, 251 sent to multicast group to reach destination designated router. 252 */ 253 struct ip_ra_chain __rcu *ip_ra_chain; 254 static DEFINE_SPINLOCK(ip_ra_lock); 255 256 257 static void ip_ra_destroy_rcu(struct rcu_head *head) 258 { 259 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 260 261 sock_put(ra->saved_sk); 262 kfree(ra); 263 } 264 265 int ip_ra_control(struct sock *sk, unsigned char on, 266 void (*destructor)(struct sock *)) 267 { 268 struct ip_ra_chain *ra, *new_ra; 269 struct ip_ra_chain __rcu **rap; 270 271 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 272 return -EINVAL; 273 274 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 275 276 spin_lock_bh(&ip_ra_lock); 277 for (rap = &ip_ra_chain; 278 (ra = rcu_dereference_protected(*rap, 279 lockdep_is_held(&ip_ra_lock))) != NULL; 280 rap = &ra->next) { 281 if (ra->sk == sk) { 282 if (on) { 283 spin_unlock_bh(&ip_ra_lock); 284 kfree(new_ra); 285 return -EADDRINUSE; 286 } 287 /* dont let ip_call_ra_chain() use sk again */ 288 ra->sk = NULL; 289 rcu_assign_pointer(*rap, ra->next); 290 spin_unlock_bh(&ip_ra_lock); 291 292 if (ra->destructor) 293 ra->destructor(sk); 294 /* 295 * Delay sock_put(sk) and kfree(ra) after one rcu grace 296 * period. This guarantee ip_call_ra_chain() dont need 297 * to mess with socket refcounts. 298 */ 299 ra->saved_sk = sk; 300 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 301 return 0; 302 } 303 } 304 if (new_ra == NULL) { 305 spin_unlock_bh(&ip_ra_lock); 306 return -ENOBUFS; 307 } 308 new_ra->sk = sk; 309 new_ra->destructor = destructor; 310 311 new_ra->next = ra; 312 rcu_assign_pointer(*rap, new_ra); 313 sock_hold(sk); 314 spin_unlock_bh(&ip_ra_lock); 315 316 return 0; 317 } 318 319 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 320 __be16 port, u32 info, u8 *payload) 321 { 322 struct sock_exterr_skb *serr; 323 324 skb = skb_clone(skb, GFP_ATOMIC); 325 if (!skb) 326 return; 327 328 serr = SKB_EXT_ERR(skb); 329 serr->ee.ee_errno = err; 330 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 331 serr->ee.ee_type = icmp_hdr(skb)->type; 332 serr->ee.ee_code = icmp_hdr(skb)->code; 333 serr->ee.ee_pad = 0; 334 serr->ee.ee_info = info; 335 serr->ee.ee_data = 0; 336 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 337 skb_network_header(skb); 338 serr->port = port; 339 340 if (skb_pull(skb, payload - skb->data) != NULL) { 341 skb_reset_transport_header(skb); 342 if (sock_queue_err_skb(sk, skb) == 0) 343 return; 344 } 345 kfree_skb(skb); 346 } 347 348 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 349 { 350 struct inet_sock *inet = inet_sk(sk); 351 struct sock_exterr_skb *serr; 352 struct iphdr *iph; 353 struct sk_buff *skb; 354 355 if (!inet->recverr) 356 return; 357 358 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 359 if (!skb) 360 return; 361 362 skb_put(skb, sizeof(struct iphdr)); 363 skb_reset_network_header(skb); 364 iph = ip_hdr(skb); 365 iph->daddr = daddr; 366 367 serr = SKB_EXT_ERR(skb); 368 serr->ee.ee_errno = err; 369 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 370 serr->ee.ee_type = 0; 371 serr->ee.ee_code = 0; 372 serr->ee.ee_pad = 0; 373 serr->ee.ee_info = info; 374 serr->ee.ee_data = 0; 375 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 376 serr->port = port; 377 378 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 379 skb_reset_transport_header(skb); 380 381 if (sock_queue_err_skb(sk, skb)) 382 kfree_skb(skb); 383 } 384 385 /* 386 * Handle MSG_ERRQUEUE 387 */ 388 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 389 { 390 struct sock_exterr_skb *serr; 391 struct sk_buff *skb, *skb2; 392 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 393 struct { 394 struct sock_extended_err ee; 395 struct sockaddr_in offender; 396 } errhdr; 397 int err; 398 int copied; 399 400 err = -EAGAIN; 401 skb = skb_dequeue(&sk->sk_error_queue); 402 if (skb == NULL) 403 goto out; 404 405 copied = skb->len; 406 if (copied > len) { 407 msg->msg_flags |= MSG_TRUNC; 408 copied = len; 409 } 410 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 411 if (err) 412 goto out_free_skb; 413 414 sock_recv_timestamp(msg, sk, skb); 415 416 serr = SKB_EXT_ERR(skb); 417 418 if (sin) { 419 sin->sin_family = AF_INET; 420 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 421 serr->addr_offset); 422 sin->sin_port = serr->port; 423 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 424 *addr_len = sizeof(*sin); 425 } 426 427 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 428 sin = &errhdr.offender; 429 sin->sin_family = AF_UNSPEC; 430 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { 431 struct inet_sock *inet = inet_sk(sk); 432 433 sin->sin_family = AF_INET; 434 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 435 sin->sin_port = 0; 436 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 437 if (inet->cmsg_flags) 438 ip_cmsg_recv(msg, skb); 439 } 440 441 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 442 443 /* Now we could try to dump offended packet options */ 444 445 msg->msg_flags |= MSG_ERRQUEUE; 446 err = copied; 447 448 /* Reset and regenerate socket error */ 449 spin_lock_bh(&sk->sk_error_queue.lock); 450 sk->sk_err = 0; 451 skb2 = skb_peek(&sk->sk_error_queue); 452 if (skb2 != NULL) { 453 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; 454 spin_unlock_bh(&sk->sk_error_queue.lock); 455 sk->sk_error_report(sk); 456 } else 457 spin_unlock_bh(&sk->sk_error_queue.lock); 458 459 out_free_skb: 460 kfree_skb(skb); 461 out: 462 return err; 463 } 464 465 466 /* 467 * Socket option code for IP. This is the end of the line after any 468 * TCP,UDP etc options on an IP socket. 469 */ 470 471 static int do_ip_setsockopt(struct sock *sk, int level, 472 int optname, char __user *optval, unsigned int optlen) 473 { 474 struct inet_sock *inet = inet_sk(sk); 475 int val = 0, err; 476 477 switch (optname) { 478 case IP_PKTINFO: 479 case IP_RECVTTL: 480 case IP_RECVOPTS: 481 case IP_RECVTOS: 482 case IP_RETOPTS: 483 case IP_TOS: 484 case IP_TTL: 485 case IP_HDRINCL: 486 case IP_MTU_DISCOVER: 487 case IP_RECVERR: 488 case IP_ROUTER_ALERT: 489 case IP_FREEBIND: 490 case IP_PASSSEC: 491 case IP_TRANSPARENT: 492 case IP_MINTTL: 493 case IP_NODEFRAG: 494 case IP_UNICAST_IF: 495 case IP_MULTICAST_TTL: 496 case IP_MULTICAST_ALL: 497 case IP_MULTICAST_LOOP: 498 case IP_RECVORIGDSTADDR: 499 if (optlen >= sizeof(int)) { 500 if (get_user(val, (int __user *) optval)) 501 return -EFAULT; 502 } else if (optlen >= sizeof(char)) { 503 unsigned char ucval; 504 505 if (get_user(ucval, (unsigned char __user *) optval)) 506 return -EFAULT; 507 val = (int) ucval; 508 } 509 } 510 511 /* If optlen==0, it is equivalent to val == 0 */ 512 513 if (ip_mroute_opt(optname)) 514 return ip_mroute_setsockopt(sk, optname, optval, optlen); 515 516 err = 0; 517 lock_sock(sk); 518 519 switch (optname) { 520 case IP_OPTIONS: 521 { 522 struct ip_options_rcu *old, *opt = NULL; 523 524 if (optlen > 40) 525 goto e_inval; 526 err = ip_options_get_from_user(sock_net(sk), &opt, 527 optval, optlen); 528 if (err) 529 break; 530 old = rcu_dereference_protected(inet->inet_opt, 531 sock_owned_by_user(sk)); 532 if (inet->is_icsk) { 533 struct inet_connection_sock *icsk = inet_csk(sk); 534 #if IS_ENABLED(CONFIG_IPV6) 535 if (sk->sk_family == PF_INET || 536 (!((1 << sk->sk_state) & 537 (TCPF_LISTEN | TCPF_CLOSE)) && 538 inet->inet_daddr != LOOPBACK4_IPV6)) { 539 #endif 540 if (old) 541 icsk->icsk_ext_hdr_len -= old->opt.optlen; 542 if (opt) 543 icsk->icsk_ext_hdr_len += opt->opt.optlen; 544 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 545 #if IS_ENABLED(CONFIG_IPV6) 546 } 547 #endif 548 } 549 rcu_assign_pointer(inet->inet_opt, opt); 550 if (old) 551 kfree_rcu(old, rcu); 552 break; 553 } 554 case IP_PKTINFO: 555 if (val) 556 inet->cmsg_flags |= IP_CMSG_PKTINFO; 557 else 558 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 559 break; 560 case IP_RECVTTL: 561 if (val) 562 inet->cmsg_flags |= IP_CMSG_TTL; 563 else 564 inet->cmsg_flags &= ~IP_CMSG_TTL; 565 break; 566 case IP_RECVTOS: 567 if (val) 568 inet->cmsg_flags |= IP_CMSG_TOS; 569 else 570 inet->cmsg_flags &= ~IP_CMSG_TOS; 571 break; 572 case IP_RECVOPTS: 573 if (val) 574 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 575 else 576 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 577 break; 578 case IP_RETOPTS: 579 if (val) 580 inet->cmsg_flags |= IP_CMSG_RETOPTS; 581 else 582 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 583 break; 584 case IP_PASSSEC: 585 if (val) 586 inet->cmsg_flags |= IP_CMSG_PASSSEC; 587 else 588 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 589 break; 590 case IP_RECVORIGDSTADDR: 591 if (val) 592 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 593 else 594 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 595 break; 596 case IP_TOS: /* This sets both TOS and Precedence */ 597 if (sk->sk_type == SOCK_STREAM) { 598 val &= ~INET_ECN_MASK; 599 val |= inet->tos & INET_ECN_MASK; 600 } 601 if (inet->tos != val) { 602 inet->tos = val; 603 sk->sk_priority = rt_tos2priority(val); 604 sk_dst_reset(sk); 605 } 606 break; 607 case IP_TTL: 608 if (optlen < 1) 609 goto e_inval; 610 if (val != -1 && (val < 1 || val > 255)) 611 goto e_inval; 612 inet->uc_ttl = val; 613 break; 614 case IP_HDRINCL: 615 if (sk->sk_type != SOCK_RAW) { 616 err = -ENOPROTOOPT; 617 break; 618 } 619 inet->hdrincl = val ? 1 : 0; 620 break; 621 case IP_NODEFRAG: 622 if (sk->sk_type != SOCK_RAW) { 623 err = -ENOPROTOOPT; 624 break; 625 } 626 inet->nodefrag = val ? 1 : 0; 627 break; 628 case IP_MTU_DISCOVER: 629 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_INTERFACE) 630 goto e_inval; 631 inet->pmtudisc = val; 632 break; 633 case IP_RECVERR: 634 inet->recverr = !!val; 635 if (!val) 636 skb_queue_purge(&sk->sk_error_queue); 637 break; 638 case IP_MULTICAST_TTL: 639 if (sk->sk_type == SOCK_STREAM) 640 goto e_inval; 641 if (optlen < 1) 642 goto e_inval; 643 if (val == -1) 644 val = 1; 645 if (val < 0 || val > 255) 646 goto e_inval; 647 inet->mc_ttl = val; 648 break; 649 case IP_MULTICAST_LOOP: 650 if (optlen < 1) 651 goto e_inval; 652 inet->mc_loop = !!val; 653 break; 654 case IP_UNICAST_IF: 655 { 656 struct net_device *dev = NULL; 657 int ifindex; 658 659 if (optlen != sizeof(int)) 660 goto e_inval; 661 662 ifindex = (__force int)ntohl((__force __be32)val); 663 if (ifindex == 0) { 664 inet->uc_index = 0; 665 err = 0; 666 break; 667 } 668 669 dev = dev_get_by_index(sock_net(sk), ifindex); 670 err = -EADDRNOTAVAIL; 671 if (!dev) 672 break; 673 dev_put(dev); 674 675 err = -EINVAL; 676 if (sk->sk_bound_dev_if) 677 break; 678 679 inet->uc_index = ifindex; 680 err = 0; 681 break; 682 } 683 case IP_MULTICAST_IF: 684 { 685 struct ip_mreqn mreq; 686 struct net_device *dev = NULL; 687 688 if (sk->sk_type == SOCK_STREAM) 689 goto e_inval; 690 /* 691 * Check the arguments are allowable 692 */ 693 694 if (optlen < sizeof(struct in_addr)) 695 goto e_inval; 696 697 err = -EFAULT; 698 if (optlen >= sizeof(struct ip_mreqn)) { 699 if (copy_from_user(&mreq, optval, sizeof(mreq))) 700 break; 701 } else { 702 memset(&mreq, 0, sizeof(mreq)); 703 if (optlen >= sizeof(struct ip_mreq)) { 704 if (copy_from_user(&mreq, optval, 705 sizeof(struct ip_mreq))) 706 break; 707 } else if (optlen >= sizeof(struct in_addr)) { 708 if (copy_from_user(&mreq.imr_address, optval, 709 sizeof(struct in_addr))) 710 break; 711 } 712 } 713 714 if (!mreq.imr_ifindex) { 715 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 716 inet->mc_index = 0; 717 inet->mc_addr = 0; 718 err = 0; 719 break; 720 } 721 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 722 if (dev) 723 mreq.imr_ifindex = dev->ifindex; 724 } else 725 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 726 727 728 err = -EADDRNOTAVAIL; 729 if (!dev) 730 break; 731 dev_put(dev); 732 733 err = -EINVAL; 734 if (sk->sk_bound_dev_if && 735 mreq.imr_ifindex != sk->sk_bound_dev_if) 736 break; 737 738 inet->mc_index = mreq.imr_ifindex; 739 inet->mc_addr = mreq.imr_address.s_addr; 740 err = 0; 741 break; 742 } 743 744 case IP_ADD_MEMBERSHIP: 745 case IP_DROP_MEMBERSHIP: 746 { 747 struct ip_mreqn mreq; 748 749 err = -EPROTO; 750 if (inet_sk(sk)->is_icsk) 751 break; 752 753 if (optlen < sizeof(struct ip_mreq)) 754 goto e_inval; 755 err = -EFAULT; 756 if (optlen >= sizeof(struct ip_mreqn)) { 757 if (copy_from_user(&mreq, optval, sizeof(mreq))) 758 break; 759 } else { 760 memset(&mreq, 0, sizeof(mreq)); 761 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 762 break; 763 } 764 765 if (optname == IP_ADD_MEMBERSHIP) 766 err = ip_mc_join_group(sk, &mreq); 767 else 768 err = ip_mc_leave_group(sk, &mreq); 769 break; 770 } 771 case IP_MSFILTER: 772 { 773 struct ip_msfilter *msf; 774 775 if (optlen < IP_MSFILTER_SIZE(0)) 776 goto e_inval; 777 if (optlen > sysctl_optmem_max) { 778 err = -ENOBUFS; 779 break; 780 } 781 msf = kmalloc(optlen, GFP_KERNEL); 782 if (!msf) { 783 err = -ENOBUFS; 784 break; 785 } 786 err = -EFAULT; 787 if (copy_from_user(msf, optval, optlen)) { 788 kfree(msf); 789 break; 790 } 791 /* numsrc >= (1G-4) overflow in 32 bits */ 792 if (msf->imsf_numsrc >= 0x3ffffffcU || 793 msf->imsf_numsrc > sysctl_igmp_max_msf) { 794 kfree(msf); 795 err = -ENOBUFS; 796 break; 797 } 798 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 799 kfree(msf); 800 err = -EINVAL; 801 break; 802 } 803 err = ip_mc_msfilter(sk, msf, 0); 804 kfree(msf); 805 break; 806 } 807 case IP_BLOCK_SOURCE: 808 case IP_UNBLOCK_SOURCE: 809 case IP_ADD_SOURCE_MEMBERSHIP: 810 case IP_DROP_SOURCE_MEMBERSHIP: 811 { 812 struct ip_mreq_source mreqs; 813 int omode, add; 814 815 if (optlen != sizeof(struct ip_mreq_source)) 816 goto e_inval; 817 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 818 err = -EFAULT; 819 break; 820 } 821 if (optname == IP_BLOCK_SOURCE) { 822 omode = MCAST_EXCLUDE; 823 add = 1; 824 } else if (optname == IP_UNBLOCK_SOURCE) { 825 omode = MCAST_EXCLUDE; 826 add = 0; 827 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 828 struct ip_mreqn mreq; 829 830 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 831 mreq.imr_address.s_addr = mreqs.imr_interface; 832 mreq.imr_ifindex = 0; 833 err = ip_mc_join_group(sk, &mreq); 834 if (err && err != -EADDRINUSE) 835 break; 836 omode = MCAST_INCLUDE; 837 add = 1; 838 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 839 omode = MCAST_INCLUDE; 840 add = 0; 841 } 842 err = ip_mc_source(add, omode, sk, &mreqs, 0); 843 break; 844 } 845 case MCAST_JOIN_GROUP: 846 case MCAST_LEAVE_GROUP: 847 { 848 struct group_req greq; 849 struct sockaddr_in *psin; 850 struct ip_mreqn mreq; 851 852 if (optlen < sizeof(struct group_req)) 853 goto e_inval; 854 err = -EFAULT; 855 if (copy_from_user(&greq, optval, sizeof(greq))) 856 break; 857 psin = (struct sockaddr_in *)&greq.gr_group; 858 if (psin->sin_family != AF_INET) 859 goto e_inval; 860 memset(&mreq, 0, sizeof(mreq)); 861 mreq.imr_multiaddr = psin->sin_addr; 862 mreq.imr_ifindex = greq.gr_interface; 863 864 if (optname == MCAST_JOIN_GROUP) 865 err = ip_mc_join_group(sk, &mreq); 866 else 867 err = ip_mc_leave_group(sk, &mreq); 868 break; 869 } 870 case MCAST_JOIN_SOURCE_GROUP: 871 case MCAST_LEAVE_SOURCE_GROUP: 872 case MCAST_BLOCK_SOURCE: 873 case MCAST_UNBLOCK_SOURCE: 874 { 875 struct group_source_req greqs; 876 struct ip_mreq_source mreqs; 877 struct sockaddr_in *psin; 878 int omode, add; 879 880 if (optlen != sizeof(struct group_source_req)) 881 goto e_inval; 882 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 883 err = -EFAULT; 884 break; 885 } 886 if (greqs.gsr_group.ss_family != AF_INET || 887 greqs.gsr_source.ss_family != AF_INET) { 888 err = -EADDRNOTAVAIL; 889 break; 890 } 891 psin = (struct sockaddr_in *)&greqs.gsr_group; 892 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 893 psin = (struct sockaddr_in *)&greqs.gsr_source; 894 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 895 mreqs.imr_interface = 0; /* use index for mc_source */ 896 897 if (optname == MCAST_BLOCK_SOURCE) { 898 omode = MCAST_EXCLUDE; 899 add = 1; 900 } else if (optname == MCAST_UNBLOCK_SOURCE) { 901 omode = MCAST_EXCLUDE; 902 add = 0; 903 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 904 struct ip_mreqn mreq; 905 906 psin = (struct sockaddr_in *)&greqs.gsr_group; 907 mreq.imr_multiaddr = psin->sin_addr; 908 mreq.imr_address.s_addr = 0; 909 mreq.imr_ifindex = greqs.gsr_interface; 910 err = ip_mc_join_group(sk, &mreq); 911 if (err && err != -EADDRINUSE) 912 break; 913 greqs.gsr_interface = mreq.imr_ifindex; 914 omode = MCAST_INCLUDE; 915 add = 1; 916 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 917 omode = MCAST_INCLUDE; 918 add = 0; 919 } 920 err = ip_mc_source(add, omode, sk, &mreqs, 921 greqs.gsr_interface); 922 break; 923 } 924 case MCAST_MSFILTER: 925 { 926 struct sockaddr_in *psin; 927 struct ip_msfilter *msf = NULL; 928 struct group_filter *gsf = NULL; 929 int msize, i, ifindex; 930 931 if (optlen < GROUP_FILTER_SIZE(0)) 932 goto e_inval; 933 if (optlen > sysctl_optmem_max) { 934 err = -ENOBUFS; 935 break; 936 } 937 gsf = kmalloc(optlen, GFP_KERNEL); 938 if (!gsf) { 939 err = -ENOBUFS; 940 break; 941 } 942 err = -EFAULT; 943 if (copy_from_user(gsf, optval, optlen)) 944 goto mc_msf_out; 945 946 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 947 if (gsf->gf_numsrc >= 0x1ffffff || 948 gsf->gf_numsrc > sysctl_igmp_max_msf) { 949 err = -ENOBUFS; 950 goto mc_msf_out; 951 } 952 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 953 err = -EINVAL; 954 goto mc_msf_out; 955 } 956 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 957 msf = kmalloc(msize, GFP_KERNEL); 958 if (!msf) { 959 err = -ENOBUFS; 960 goto mc_msf_out; 961 } 962 ifindex = gsf->gf_interface; 963 psin = (struct sockaddr_in *)&gsf->gf_group; 964 if (psin->sin_family != AF_INET) { 965 err = -EADDRNOTAVAIL; 966 goto mc_msf_out; 967 } 968 msf->imsf_multiaddr = psin->sin_addr.s_addr; 969 msf->imsf_interface = 0; 970 msf->imsf_fmode = gsf->gf_fmode; 971 msf->imsf_numsrc = gsf->gf_numsrc; 972 err = -EADDRNOTAVAIL; 973 for (i = 0; i < gsf->gf_numsrc; ++i) { 974 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 975 976 if (psin->sin_family != AF_INET) 977 goto mc_msf_out; 978 msf->imsf_slist[i] = psin->sin_addr.s_addr; 979 } 980 kfree(gsf); 981 gsf = NULL; 982 983 err = ip_mc_msfilter(sk, msf, ifindex); 984 mc_msf_out: 985 kfree(msf); 986 kfree(gsf); 987 break; 988 } 989 case IP_MULTICAST_ALL: 990 if (optlen < 1) 991 goto e_inval; 992 if (val != 0 && val != 1) 993 goto e_inval; 994 inet->mc_all = val; 995 break; 996 case IP_ROUTER_ALERT: 997 err = ip_ra_control(sk, val ? 1 : 0, NULL); 998 break; 999 1000 case IP_FREEBIND: 1001 if (optlen < 1) 1002 goto e_inval; 1003 inet->freebind = !!val; 1004 break; 1005 1006 case IP_IPSEC_POLICY: 1007 case IP_XFRM_POLICY: 1008 err = -EPERM; 1009 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1010 break; 1011 err = xfrm_user_policy(sk, optname, optval, optlen); 1012 break; 1013 1014 case IP_TRANSPARENT: 1015 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1016 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1017 err = -EPERM; 1018 break; 1019 } 1020 if (optlen < 1) 1021 goto e_inval; 1022 inet->transparent = !!val; 1023 break; 1024 1025 case IP_MINTTL: 1026 if (optlen < 1) 1027 goto e_inval; 1028 if (val < 0 || val > 255) 1029 goto e_inval; 1030 inet->min_ttl = val; 1031 break; 1032 1033 default: 1034 err = -ENOPROTOOPT; 1035 break; 1036 } 1037 release_sock(sk); 1038 return err; 1039 1040 e_inval: 1041 release_sock(sk); 1042 return -EINVAL; 1043 } 1044 1045 /** 1046 * ipv4_pktinfo_prepare - transfert some info from rtable to skb 1047 * @sk: socket 1048 * @skb: buffer 1049 * 1050 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1051 * destination in skb->cb[] before dst drop. 1052 * This way, receiver doesn't make cache line misses to read rtable. 1053 */ 1054 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1055 { 1056 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1057 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1058 ipv6_sk_rxinfo(sk); 1059 1060 if (prepare && 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