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 #include <net/checksum.h> 41 #if IS_ENABLED(CONFIG_IPV6) 42 #include <net/transp_v6.h> 43 #endif 44 #include <net/ip_fib.h> 45 46 #include <linux/errqueue.h> 47 #include <asm/uaccess.h> 48 49 /* 50 * SOL_IP control messages. 51 */ 52 53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 54 { 55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 56 57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 58 59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 60 } 61 62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 63 { 64 int ttl = ip_hdr(skb)->ttl; 65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 66 } 67 68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 69 { 70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 71 } 72 73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 74 { 75 if (IPCB(skb)->opt.optlen == 0) 76 return; 77 78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 79 ip_hdr(skb) + 1); 80 } 81 82 83 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 84 { 85 unsigned char optbuf[sizeof(struct ip_options) + 40]; 86 struct ip_options *opt = (struct ip_options *)optbuf; 87 88 if (IPCB(skb)->opt.optlen == 0) 89 return; 90 91 if (ip_options_echo(opt, skb)) { 92 msg->msg_flags |= MSG_CTRUNC; 93 return; 94 } 95 ip_options_undo(opt); 96 97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 98 } 99 100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 101 int offset) 102 { 103 __wsum csum = skb->csum; 104 105 if (skb->ip_summed != CHECKSUM_COMPLETE) 106 return; 107 108 if (offset != 0) 109 csum = csum_sub(csum, csum_partial(skb->data, offset, 0)); 110 111 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 112 } 113 114 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 115 { 116 char *secdata; 117 u32 seclen, secid; 118 int err; 119 120 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 121 if (err) 122 return; 123 124 err = security_secid_to_secctx(secid, &secdata, &seclen); 125 if (err) 126 return; 127 128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 129 security_release_secctx(secdata, seclen); 130 } 131 132 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 133 { 134 struct sockaddr_in sin; 135 const struct iphdr *iph = ip_hdr(skb); 136 __be16 *ports = (__be16 *)skb_transport_header(skb); 137 138 if (skb_transport_offset(skb) + 4 > skb->len) 139 return; 140 141 /* All current transport protocols have the port numbers in the 142 * first four bytes of the transport header and this function is 143 * written with this assumption in mind. 144 */ 145 146 sin.sin_family = AF_INET; 147 sin.sin_addr.s_addr = iph->daddr; 148 sin.sin_port = ports[1]; 149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 150 151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 152 } 153 154 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, 155 int offset) 156 { 157 struct inet_sock *inet = inet_sk(skb->sk); 158 unsigned int flags = inet->cmsg_flags; 159 160 /* Ordered by supposed usage frequency */ 161 if (flags & IP_CMSG_PKTINFO) { 162 ip_cmsg_recv_pktinfo(msg, skb); 163 164 flags &= ~IP_CMSG_PKTINFO; 165 if (!flags) 166 return; 167 } 168 169 if (flags & IP_CMSG_TTL) { 170 ip_cmsg_recv_ttl(msg, skb); 171 172 flags &= ~IP_CMSG_TTL; 173 if (!flags) 174 return; 175 } 176 177 if (flags & IP_CMSG_TOS) { 178 ip_cmsg_recv_tos(msg, skb); 179 180 flags &= ~IP_CMSG_TOS; 181 if (!flags) 182 return; 183 } 184 185 if (flags & IP_CMSG_RECVOPTS) { 186 ip_cmsg_recv_opts(msg, skb); 187 188 flags &= ~IP_CMSG_RECVOPTS; 189 if (!flags) 190 return; 191 } 192 193 if (flags & IP_CMSG_RETOPTS) { 194 ip_cmsg_recv_retopts(msg, skb); 195 196 flags &= ~IP_CMSG_RETOPTS; 197 if (!flags) 198 return; 199 } 200 201 if (flags & IP_CMSG_PASSSEC) { 202 ip_cmsg_recv_security(msg, skb); 203 204 flags &= ~IP_CMSG_PASSSEC; 205 if (!flags) 206 return; 207 } 208 209 if (flags & IP_CMSG_ORIGDSTADDR) { 210 ip_cmsg_recv_dstaddr(msg, skb); 211 212 flags &= ~IP_CMSG_ORIGDSTADDR; 213 if (!flags) 214 return; 215 } 216 217 if (flags & IP_CMSG_CHECKSUM) 218 ip_cmsg_recv_checksum(msg, skb, offset); 219 } 220 EXPORT_SYMBOL(ip_cmsg_recv_offset); 221 222 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, 223 bool allow_ipv6) 224 { 225 int err, val; 226 struct cmsghdr *cmsg; 227 228 for_each_cmsghdr(cmsg, msg) { 229 if (!CMSG_OK(msg, cmsg)) 230 return -EINVAL; 231 #if IS_ENABLED(CONFIG_IPV6) 232 if (allow_ipv6 && 233 cmsg->cmsg_level == SOL_IPV6 && 234 cmsg->cmsg_type == IPV6_PKTINFO) { 235 struct in6_pktinfo *src_info; 236 237 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 238 return -EINVAL; 239 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 240 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 241 return -EINVAL; 242 ipc->oif = src_info->ipi6_ifindex; 243 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 244 continue; 245 } 246 #endif 247 if (cmsg->cmsg_level != SOL_IP) 248 continue; 249 switch (cmsg->cmsg_type) { 250 case IP_RETOPTS: 251 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 252 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 253 err < 40 ? err : 40); 254 if (err) 255 return err; 256 break; 257 case IP_PKTINFO: 258 { 259 struct in_pktinfo *info; 260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 261 return -EINVAL; 262 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 263 ipc->oif = info->ipi_ifindex; 264 ipc->addr = info->ipi_spec_dst.s_addr; 265 break; 266 } 267 case IP_TTL: 268 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 269 return -EINVAL; 270 val = *(int *)CMSG_DATA(cmsg); 271 if (val < 1 || val > 255) 272 return -EINVAL; 273 ipc->ttl = val; 274 break; 275 case IP_TOS: 276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 277 return -EINVAL; 278 val = *(int *)CMSG_DATA(cmsg); 279 if (val < 0 || val > 255) 280 return -EINVAL; 281 ipc->tos = val; 282 ipc->priority = rt_tos2priority(ipc->tos); 283 break; 284 285 default: 286 return -EINVAL; 287 } 288 } 289 return 0; 290 } 291 292 293 /* Special input handler for packets caught by router alert option. 294 They are selected only by protocol field, and then processed likely 295 local ones; but only if someone wants them! Otherwise, router 296 not running rsvpd will kill RSVP. 297 298 It is user level problem, what it will make with them. 299 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 300 but receiver should be enough clever f.e. to forward mtrace requests, 301 sent to multicast group to reach destination designated router. 302 */ 303 struct ip_ra_chain __rcu *ip_ra_chain; 304 static DEFINE_SPINLOCK(ip_ra_lock); 305 306 307 static void ip_ra_destroy_rcu(struct rcu_head *head) 308 { 309 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 310 311 sock_put(ra->saved_sk); 312 kfree(ra); 313 } 314 315 int ip_ra_control(struct sock *sk, unsigned char on, 316 void (*destructor)(struct sock *)) 317 { 318 struct ip_ra_chain *ra, *new_ra; 319 struct ip_ra_chain __rcu **rap; 320 321 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 322 return -EINVAL; 323 324 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 325 326 spin_lock_bh(&ip_ra_lock); 327 for (rap = &ip_ra_chain; 328 (ra = rcu_dereference_protected(*rap, 329 lockdep_is_held(&ip_ra_lock))) != NULL; 330 rap = &ra->next) { 331 if (ra->sk == sk) { 332 if (on) { 333 spin_unlock_bh(&ip_ra_lock); 334 kfree(new_ra); 335 return -EADDRINUSE; 336 } 337 /* dont let ip_call_ra_chain() use sk again */ 338 ra->sk = NULL; 339 RCU_INIT_POINTER(*rap, ra->next); 340 spin_unlock_bh(&ip_ra_lock); 341 342 if (ra->destructor) 343 ra->destructor(sk); 344 /* 345 * Delay sock_put(sk) and kfree(ra) after one rcu grace 346 * period. This guarantee ip_call_ra_chain() dont need 347 * to mess with socket refcounts. 348 */ 349 ra->saved_sk = sk; 350 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 351 return 0; 352 } 353 } 354 if (!new_ra) { 355 spin_unlock_bh(&ip_ra_lock); 356 return -ENOBUFS; 357 } 358 new_ra->sk = sk; 359 new_ra->destructor = destructor; 360 361 RCU_INIT_POINTER(new_ra->next, ra); 362 rcu_assign_pointer(*rap, new_ra); 363 sock_hold(sk); 364 spin_unlock_bh(&ip_ra_lock); 365 366 return 0; 367 } 368 369 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 370 __be16 port, u32 info, u8 *payload) 371 { 372 struct sock_exterr_skb *serr; 373 374 skb = skb_clone(skb, GFP_ATOMIC); 375 if (!skb) 376 return; 377 378 serr = SKB_EXT_ERR(skb); 379 serr->ee.ee_errno = err; 380 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 381 serr->ee.ee_type = icmp_hdr(skb)->type; 382 serr->ee.ee_code = icmp_hdr(skb)->code; 383 serr->ee.ee_pad = 0; 384 serr->ee.ee_info = info; 385 serr->ee.ee_data = 0; 386 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 387 skb_network_header(skb); 388 serr->port = port; 389 390 if (skb_pull(skb, payload - skb->data)) { 391 skb_reset_transport_header(skb); 392 if (sock_queue_err_skb(sk, skb) == 0) 393 return; 394 } 395 kfree_skb(skb); 396 } 397 398 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 399 { 400 struct inet_sock *inet = inet_sk(sk); 401 struct sock_exterr_skb *serr; 402 struct iphdr *iph; 403 struct sk_buff *skb; 404 405 if (!inet->recverr) 406 return; 407 408 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 409 if (!skb) 410 return; 411 412 skb_put(skb, sizeof(struct iphdr)); 413 skb_reset_network_header(skb); 414 iph = ip_hdr(skb); 415 iph->daddr = daddr; 416 417 serr = SKB_EXT_ERR(skb); 418 serr->ee.ee_errno = err; 419 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 420 serr->ee.ee_type = 0; 421 serr->ee.ee_code = 0; 422 serr->ee.ee_pad = 0; 423 serr->ee.ee_info = info; 424 serr->ee.ee_data = 0; 425 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 426 serr->port = port; 427 428 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 429 skb_reset_transport_header(skb); 430 431 if (sock_queue_err_skb(sk, skb)) 432 kfree_skb(skb); 433 } 434 435 /* IPv4 supports cmsg on all imcp errors and some timestamps 436 * 437 * Timestamp code paths do not initialize the fields expected by cmsg: 438 * the PKTINFO fields in skb->cb[]. Fill those in here. 439 */ 440 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 441 struct sk_buff *skb, 442 int ee_origin) 443 { 444 struct in_pktinfo *info; 445 446 if (ee_origin == SO_EE_ORIGIN_ICMP) 447 return true; 448 449 if (ee_origin == SO_EE_ORIGIN_LOCAL) 450 return false; 451 452 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 453 * timestamp with egress dev. Not possible for packets without dev 454 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 455 */ 456 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 457 (!skb->dev)) 458 return false; 459 460 info = PKTINFO_SKB_CB(skb); 461 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 462 info->ipi_ifindex = skb->dev->ifindex; 463 return true; 464 } 465 466 /* 467 * Handle MSG_ERRQUEUE 468 */ 469 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 470 { 471 struct sock_exterr_skb *serr; 472 struct sk_buff *skb; 473 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 474 struct { 475 struct sock_extended_err ee; 476 struct sockaddr_in offender; 477 } errhdr; 478 int err; 479 int copied; 480 481 WARN_ON_ONCE(sk->sk_family == AF_INET6); 482 483 err = -EAGAIN; 484 skb = sock_dequeue_err_skb(sk); 485 if (!skb) 486 goto out; 487 488 copied = skb->len; 489 if (copied > len) { 490 msg->msg_flags |= MSG_TRUNC; 491 copied = len; 492 } 493 err = skb_copy_datagram_msg(skb, 0, msg, copied); 494 if (err) 495 goto out_free_skb; 496 497 sock_recv_timestamp(msg, sk, skb); 498 499 serr = SKB_EXT_ERR(skb); 500 501 if (sin && serr->port) { 502 sin->sin_family = AF_INET; 503 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 504 serr->addr_offset); 505 sin->sin_port = serr->port; 506 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 507 *addr_len = sizeof(*sin); 508 } 509 510 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 511 sin = &errhdr.offender; 512 memset(sin, 0, sizeof(*sin)); 513 514 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 515 sin->sin_family = AF_INET; 516 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 517 if (inet_sk(sk)->cmsg_flags) 518 ip_cmsg_recv(msg, skb); 519 } 520 521 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 522 523 /* Now we could try to dump offended packet options */ 524 525 msg->msg_flags |= MSG_ERRQUEUE; 526 err = copied; 527 528 out_free_skb: 529 kfree_skb(skb); 530 out: 531 return err; 532 } 533 534 535 /* 536 * Socket option code for IP. This is the end of the line after any 537 * TCP,UDP etc options on an IP socket. 538 */ 539 static bool setsockopt_needs_rtnl(int optname) 540 { 541 switch (optname) { 542 case IP_ADD_MEMBERSHIP: 543 case IP_ADD_SOURCE_MEMBERSHIP: 544 case IP_BLOCK_SOURCE: 545 case IP_DROP_MEMBERSHIP: 546 case IP_DROP_SOURCE_MEMBERSHIP: 547 case IP_MSFILTER: 548 case IP_UNBLOCK_SOURCE: 549 case MCAST_BLOCK_SOURCE: 550 case MCAST_MSFILTER: 551 case MCAST_JOIN_GROUP: 552 case MCAST_JOIN_SOURCE_GROUP: 553 case MCAST_LEAVE_GROUP: 554 case MCAST_LEAVE_SOURCE_GROUP: 555 case MCAST_UNBLOCK_SOURCE: 556 return true; 557 } 558 return false; 559 } 560 561 static int do_ip_setsockopt(struct sock *sk, int level, 562 int optname, char __user *optval, unsigned int optlen) 563 { 564 struct inet_sock *inet = inet_sk(sk); 565 int val = 0, err; 566 bool needs_rtnl = setsockopt_needs_rtnl(optname); 567 568 switch (optname) { 569 case IP_PKTINFO: 570 case IP_RECVTTL: 571 case IP_RECVOPTS: 572 case IP_RECVTOS: 573 case IP_RETOPTS: 574 case IP_TOS: 575 case IP_TTL: 576 case IP_HDRINCL: 577 case IP_MTU_DISCOVER: 578 case IP_RECVERR: 579 case IP_ROUTER_ALERT: 580 case IP_FREEBIND: 581 case IP_PASSSEC: 582 case IP_TRANSPARENT: 583 case IP_MINTTL: 584 case IP_NODEFRAG: 585 case IP_UNICAST_IF: 586 case IP_MULTICAST_TTL: 587 case IP_MULTICAST_ALL: 588 case IP_MULTICAST_LOOP: 589 case IP_RECVORIGDSTADDR: 590 case IP_CHECKSUM: 591 if (optlen >= sizeof(int)) { 592 if (get_user(val, (int __user *) optval)) 593 return -EFAULT; 594 } else if (optlen >= sizeof(char)) { 595 unsigned char ucval; 596 597 if (get_user(ucval, (unsigned char __user *) optval)) 598 return -EFAULT; 599 val = (int) ucval; 600 } 601 } 602 603 /* If optlen==0, it is equivalent to val == 0 */ 604 605 if (ip_mroute_opt(optname)) 606 return ip_mroute_setsockopt(sk, optname, optval, optlen); 607 608 err = 0; 609 if (needs_rtnl) 610 rtnl_lock(); 611 lock_sock(sk); 612 613 switch (optname) { 614 case IP_OPTIONS: 615 { 616 struct ip_options_rcu *old, *opt = NULL; 617 618 if (optlen > 40) 619 goto e_inval; 620 err = ip_options_get_from_user(sock_net(sk), &opt, 621 optval, optlen); 622 if (err) 623 break; 624 old = rcu_dereference_protected(inet->inet_opt, 625 sock_owned_by_user(sk)); 626 if (inet->is_icsk) { 627 struct inet_connection_sock *icsk = inet_csk(sk); 628 #if IS_ENABLED(CONFIG_IPV6) 629 if (sk->sk_family == PF_INET || 630 (!((1 << sk->sk_state) & 631 (TCPF_LISTEN | TCPF_CLOSE)) && 632 inet->inet_daddr != LOOPBACK4_IPV6)) { 633 #endif 634 if (old) 635 icsk->icsk_ext_hdr_len -= old->opt.optlen; 636 if (opt) 637 icsk->icsk_ext_hdr_len += opt->opt.optlen; 638 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 639 #if IS_ENABLED(CONFIG_IPV6) 640 } 641 #endif 642 } 643 rcu_assign_pointer(inet->inet_opt, opt); 644 if (old) 645 kfree_rcu(old, rcu); 646 break; 647 } 648 case IP_PKTINFO: 649 if (val) 650 inet->cmsg_flags |= IP_CMSG_PKTINFO; 651 else 652 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 653 break; 654 case IP_RECVTTL: 655 if (val) 656 inet->cmsg_flags |= IP_CMSG_TTL; 657 else 658 inet->cmsg_flags &= ~IP_CMSG_TTL; 659 break; 660 case IP_RECVTOS: 661 if (val) 662 inet->cmsg_flags |= IP_CMSG_TOS; 663 else 664 inet->cmsg_flags &= ~IP_CMSG_TOS; 665 break; 666 case IP_RECVOPTS: 667 if (val) 668 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 669 else 670 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 671 break; 672 case IP_RETOPTS: 673 if (val) 674 inet->cmsg_flags |= IP_CMSG_RETOPTS; 675 else 676 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 677 break; 678 case IP_PASSSEC: 679 if (val) 680 inet->cmsg_flags |= IP_CMSG_PASSSEC; 681 else 682 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 683 break; 684 case IP_RECVORIGDSTADDR: 685 if (val) 686 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 687 else 688 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 689 break; 690 case IP_CHECKSUM: 691 if (val) { 692 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 693 inet_inc_convert_csum(sk); 694 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 695 } 696 } else { 697 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 698 inet_dec_convert_csum(sk); 699 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 700 } 701 } 702 break; 703 case IP_TOS: /* This sets both TOS and Precedence */ 704 if (sk->sk_type == SOCK_STREAM) { 705 val &= ~INET_ECN_MASK; 706 val |= inet->tos & INET_ECN_MASK; 707 } 708 if (inet->tos != val) { 709 inet->tos = val; 710 sk->sk_priority = rt_tos2priority(val); 711 sk_dst_reset(sk); 712 } 713 break; 714 case IP_TTL: 715 if (optlen < 1) 716 goto e_inval; 717 if (val != -1 && (val < 1 || val > 255)) 718 goto e_inval; 719 inet->uc_ttl = val; 720 break; 721 case IP_HDRINCL: 722 if (sk->sk_type != SOCK_RAW) { 723 err = -ENOPROTOOPT; 724 break; 725 } 726 inet->hdrincl = val ? 1 : 0; 727 break; 728 case IP_NODEFRAG: 729 if (sk->sk_type != SOCK_RAW) { 730 err = -ENOPROTOOPT; 731 break; 732 } 733 inet->nodefrag = val ? 1 : 0; 734 break; 735 case IP_MTU_DISCOVER: 736 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 737 goto e_inval; 738 inet->pmtudisc = val; 739 break; 740 case IP_RECVERR: 741 inet->recverr = !!val; 742 if (!val) 743 skb_queue_purge(&sk->sk_error_queue); 744 break; 745 case IP_MULTICAST_TTL: 746 if (sk->sk_type == SOCK_STREAM) 747 goto e_inval; 748 if (optlen < 1) 749 goto e_inval; 750 if (val == -1) 751 val = 1; 752 if (val < 0 || val > 255) 753 goto e_inval; 754 inet->mc_ttl = val; 755 break; 756 case IP_MULTICAST_LOOP: 757 if (optlen < 1) 758 goto e_inval; 759 inet->mc_loop = !!val; 760 break; 761 case IP_UNICAST_IF: 762 { 763 struct net_device *dev = NULL; 764 int ifindex; 765 766 if (optlen != sizeof(int)) 767 goto e_inval; 768 769 ifindex = (__force int)ntohl((__force __be32)val); 770 if (ifindex == 0) { 771 inet->uc_index = 0; 772 err = 0; 773 break; 774 } 775 776 dev = dev_get_by_index(sock_net(sk), ifindex); 777 err = -EADDRNOTAVAIL; 778 if (!dev) 779 break; 780 dev_put(dev); 781 782 err = -EINVAL; 783 if (sk->sk_bound_dev_if) 784 break; 785 786 inet->uc_index = ifindex; 787 err = 0; 788 break; 789 } 790 case IP_MULTICAST_IF: 791 { 792 struct ip_mreqn mreq; 793 struct net_device *dev = NULL; 794 795 if (sk->sk_type == SOCK_STREAM) 796 goto e_inval; 797 /* 798 * Check the arguments are allowable 799 */ 800 801 if (optlen < sizeof(struct in_addr)) 802 goto e_inval; 803 804 err = -EFAULT; 805 if (optlen >= sizeof(struct ip_mreqn)) { 806 if (copy_from_user(&mreq, optval, sizeof(mreq))) 807 break; 808 } else { 809 memset(&mreq, 0, sizeof(mreq)); 810 if (optlen >= sizeof(struct ip_mreq)) { 811 if (copy_from_user(&mreq, optval, 812 sizeof(struct ip_mreq))) 813 break; 814 } else if (optlen >= sizeof(struct in_addr)) { 815 if (copy_from_user(&mreq.imr_address, optval, 816 sizeof(struct in_addr))) 817 break; 818 } 819 } 820 821 if (!mreq.imr_ifindex) { 822 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 823 inet->mc_index = 0; 824 inet->mc_addr = 0; 825 err = 0; 826 break; 827 } 828 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 829 if (dev) 830 mreq.imr_ifindex = dev->ifindex; 831 } else 832 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 833 834 835 err = -EADDRNOTAVAIL; 836 if (!dev) 837 break; 838 dev_put(dev); 839 840 err = -EINVAL; 841 if (sk->sk_bound_dev_if && 842 mreq.imr_ifindex != sk->sk_bound_dev_if) 843 break; 844 845 inet->mc_index = mreq.imr_ifindex; 846 inet->mc_addr = mreq.imr_address.s_addr; 847 err = 0; 848 break; 849 } 850 851 case IP_ADD_MEMBERSHIP: 852 case IP_DROP_MEMBERSHIP: 853 { 854 struct ip_mreqn mreq; 855 856 err = -EPROTO; 857 if (inet_sk(sk)->is_icsk) 858 break; 859 860 if (optlen < sizeof(struct ip_mreq)) 861 goto e_inval; 862 err = -EFAULT; 863 if (optlen >= sizeof(struct ip_mreqn)) { 864 if (copy_from_user(&mreq, optval, sizeof(mreq))) 865 break; 866 } else { 867 memset(&mreq, 0, sizeof(mreq)); 868 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 869 break; 870 } 871 872 if (optname == IP_ADD_MEMBERSHIP) 873 err = ip_mc_join_group(sk, &mreq); 874 else 875 err = ip_mc_leave_group(sk, &mreq); 876 break; 877 } 878 case IP_MSFILTER: 879 { 880 struct ip_msfilter *msf; 881 882 if (optlen < IP_MSFILTER_SIZE(0)) 883 goto e_inval; 884 if (optlen > sysctl_optmem_max) { 885 err = -ENOBUFS; 886 break; 887 } 888 msf = kmalloc(optlen, GFP_KERNEL); 889 if (!msf) { 890 err = -ENOBUFS; 891 break; 892 } 893 err = -EFAULT; 894 if (copy_from_user(msf, optval, optlen)) { 895 kfree(msf); 896 break; 897 } 898 /* numsrc >= (1G-4) overflow in 32 bits */ 899 if (msf->imsf_numsrc >= 0x3ffffffcU || 900 msf->imsf_numsrc > sysctl_igmp_max_msf) { 901 kfree(msf); 902 err = -ENOBUFS; 903 break; 904 } 905 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 906 kfree(msf); 907 err = -EINVAL; 908 break; 909 } 910 err = ip_mc_msfilter(sk, msf, 0); 911 kfree(msf); 912 break; 913 } 914 case IP_BLOCK_SOURCE: 915 case IP_UNBLOCK_SOURCE: 916 case IP_ADD_SOURCE_MEMBERSHIP: 917 case IP_DROP_SOURCE_MEMBERSHIP: 918 { 919 struct ip_mreq_source mreqs; 920 int omode, add; 921 922 if (optlen != sizeof(struct ip_mreq_source)) 923 goto e_inval; 924 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 925 err = -EFAULT; 926 break; 927 } 928 if (optname == IP_BLOCK_SOURCE) { 929 omode = MCAST_EXCLUDE; 930 add = 1; 931 } else if (optname == IP_UNBLOCK_SOURCE) { 932 omode = MCAST_EXCLUDE; 933 add = 0; 934 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 935 struct ip_mreqn mreq; 936 937 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 938 mreq.imr_address.s_addr = mreqs.imr_interface; 939 mreq.imr_ifindex = 0; 940 err = ip_mc_join_group(sk, &mreq); 941 if (err && err != -EADDRINUSE) 942 break; 943 omode = MCAST_INCLUDE; 944 add = 1; 945 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 946 omode = MCAST_INCLUDE; 947 add = 0; 948 } 949 err = ip_mc_source(add, omode, sk, &mreqs, 0); 950 break; 951 } 952 case MCAST_JOIN_GROUP: 953 case MCAST_LEAVE_GROUP: 954 { 955 struct group_req greq; 956 struct sockaddr_in *psin; 957 struct ip_mreqn mreq; 958 959 if (optlen < sizeof(struct group_req)) 960 goto e_inval; 961 err = -EFAULT; 962 if (copy_from_user(&greq, optval, sizeof(greq))) 963 break; 964 psin = (struct sockaddr_in *)&greq.gr_group; 965 if (psin->sin_family != AF_INET) 966 goto e_inval; 967 memset(&mreq, 0, sizeof(mreq)); 968 mreq.imr_multiaddr = psin->sin_addr; 969 mreq.imr_ifindex = greq.gr_interface; 970 971 if (optname == MCAST_JOIN_GROUP) 972 err = ip_mc_join_group(sk, &mreq); 973 else 974 err = ip_mc_leave_group(sk, &mreq); 975 break; 976 } 977 case MCAST_JOIN_SOURCE_GROUP: 978 case MCAST_LEAVE_SOURCE_GROUP: 979 case MCAST_BLOCK_SOURCE: 980 case MCAST_UNBLOCK_SOURCE: 981 { 982 struct group_source_req greqs; 983 struct ip_mreq_source mreqs; 984 struct sockaddr_in *psin; 985 int omode, add; 986 987 if (optlen != sizeof(struct group_source_req)) 988 goto e_inval; 989 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 990 err = -EFAULT; 991 break; 992 } 993 if (greqs.gsr_group.ss_family != AF_INET || 994 greqs.gsr_source.ss_family != AF_INET) { 995 err = -EADDRNOTAVAIL; 996 break; 997 } 998 psin = (struct sockaddr_in *)&greqs.gsr_group; 999 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1000 psin = (struct sockaddr_in *)&greqs.gsr_source; 1001 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1002 mreqs.imr_interface = 0; /* use index for mc_source */ 1003 1004 if (optname == MCAST_BLOCK_SOURCE) { 1005 omode = MCAST_EXCLUDE; 1006 add = 1; 1007 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1008 omode = MCAST_EXCLUDE; 1009 add = 0; 1010 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1011 struct ip_mreqn mreq; 1012 1013 psin = (struct sockaddr_in *)&greqs.gsr_group; 1014 mreq.imr_multiaddr = psin->sin_addr; 1015 mreq.imr_address.s_addr = 0; 1016 mreq.imr_ifindex = greqs.gsr_interface; 1017 err = ip_mc_join_group(sk, &mreq); 1018 if (err && err != -EADDRINUSE) 1019 break; 1020 greqs.gsr_interface = mreq.imr_ifindex; 1021 omode = MCAST_INCLUDE; 1022 add = 1; 1023 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1024 omode = MCAST_INCLUDE; 1025 add = 0; 1026 } 1027 err = ip_mc_source(add, omode, sk, &mreqs, 1028 greqs.gsr_interface); 1029 break; 1030 } 1031 case MCAST_MSFILTER: 1032 { 1033 struct sockaddr_in *psin; 1034 struct ip_msfilter *msf = NULL; 1035 struct group_filter *gsf = NULL; 1036 int msize, i, ifindex; 1037 1038 if (optlen < GROUP_FILTER_SIZE(0)) 1039 goto e_inval; 1040 if (optlen > sysctl_optmem_max) { 1041 err = -ENOBUFS; 1042 break; 1043 } 1044 gsf = kmalloc(optlen, GFP_KERNEL); 1045 if (!gsf) { 1046 err = -ENOBUFS; 1047 break; 1048 } 1049 err = -EFAULT; 1050 if (copy_from_user(gsf, optval, optlen)) 1051 goto mc_msf_out; 1052 1053 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1054 if (gsf->gf_numsrc >= 0x1ffffff || 1055 gsf->gf_numsrc > sysctl_igmp_max_msf) { 1056 err = -ENOBUFS; 1057 goto mc_msf_out; 1058 } 1059 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1060 err = -EINVAL; 1061 goto mc_msf_out; 1062 } 1063 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1064 msf = kmalloc(msize, GFP_KERNEL); 1065 if (!msf) { 1066 err = -ENOBUFS; 1067 goto mc_msf_out; 1068 } 1069 ifindex = gsf->gf_interface; 1070 psin = (struct sockaddr_in *)&gsf->gf_group; 1071 if (psin->sin_family != AF_INET) { 1072 err = -EADDRNOTAVAIL; 1073 goto mc_msf_out; 1074 } 1075 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1076 msf->imsf_interface = 0; 1077 msf->imsf_fmode = gsf->gf_fmode; 1078 msf->imsf_numsrc = gsf->gf_numsrc; 1079 err = -EADDRNOTAVAIL; 1080 for (i = 0; i < gsf->gf_numsrc; ++i) { 1081 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1082 1083 if (psin->sin_family != AF_INET) 1084 goto mc_msf_out; 1085 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1086 } 1087 kfree(gsf); 1088 gsf = NULL; 1089 1090 err = ip_mc_msfilter(sk, msf, ifindex); 1091 mc_msf_out: 1092 kfree(msf); 1093 kfree(gsf); 1094 break; 1095 } 1096 case IP_MULTICAST_ALL: 1097 if (optlen < 1) 1098 goto e_inval; 1099 if (val != 0 && val != 1) 1100 goto e_inval; 1101 inet->mc_all = val; 1102 break; 1103 case IP_ROUTER_ALERT: 1104 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1105 break; 1106 1107 case IP_FREEBIND: 1108 if (optlen < 1) 1109 goto e_inval; 1110 inet->freebind = !!val; 1111 break; 1112 1113 case IP_IPSEC_POLICY: 1114 case IP_XFRM_POLICY: 1115 err = -EPERM; 1116 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1117 break; 1118 err = xfrm_user_policy(sk, optname, optval, optlen); 1119 break; 1120 1121 case IP_TRANSPARENT: 1122 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1123 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1124 err = -EPERM; 1125 break; 1126 } 1127 if (optlen < 1) 1128 goto e_inval; 1129 inet->transparent = !!val; 1130 break; 1131 1132 case IP_MINTTL: 1133 if (optlen < 1) 1134 goto e_inval; 1135 if (val < 0 || val > 255) 1136 goto e_inval; 1137 inet->min_ttl = val; 1138 break; 1139 1140 default: 1141 err = -ENOPROTOOPT; 1142 break; 1143 } 1144 release_sock(sk); 1145 if (needs_rtnl) 1146 rtnl_unlock(); 1147 return err; 1148 1149 e_inval: 1150 release_sock(sk); 1151 if (needs_rtnl) 1152 rtnl_unlock(); 1153 return -EINVAL; 1154 } 1155 1156 /** 1157 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1158 * @sk: socket 1159 * @skb: buffer 1160 * 1161 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1162 * destination in skb->cb[] before dst drop. 1163 * This way, receiver doesn't make cache line misses to read rtable. 1164 */ 1165 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1166 { 1167 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1168 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1169 ipv6_sk_rxinfo(sk); 1170 1171 if (prepare && skb_rtable(skb)) { 1172 pktinfo->ipi_ifindex = inet_iif(skb); 1173 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1174 } else { 1175 pktinfo->ipi_ifindex = 0; 1176 pktinfo->ipi_spec_dst.s_addr = 0; 1177 } 1178 skb_dst_drop(skb); 1179 } 1180 1181 int ip_setsockopt(struct sock *sk, int level, 1182 int optname, char __user *optval, unsigned int optlen) 1183 { 1184 int err; 1185 1186 if (level != SOL_IP) 1187 return -ENOPROTOOPT; 1188 1189 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1190 #ifdef CONFIG_NETFILTER 1191 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1192 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1193 optname != IP_IPSEC_POLICY && 1194 optname != IP_XFRM_POLICY && 1195 !ip_mroute_opt(optname)) { 1196 lock_sock(sk); 1197 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1198 release_sock(sk); 1199 } 1200 #endif 1201 return err; 1202 } 1203 EXPORT_SYMBOL(ip_setsockopt); 1204 1205 #ifdef CONFIG_COMPAT 1206 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1207 char __user *optval, unsigned int optlen) 1208 { 1209 int err; 1210 1211 if (level != SOL_IP) 1212 return -ENOPROTOOPT; 1213 1214 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1215 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1216 ip_setsockopt); 1217 1218 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1219 #ifdef CONFIG_NETFILTER 1220 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1221 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1222 optname != IP_IPSEC_POLICY && 1223 optname != IP_XFRM_POLICY && 1224 !ip_mroute_opt(optname)) { 1225 lock_sock(sk); 1226 err = compat_nf_setsockopt(sk, PF_INET, optname, 1227 optval, optlen); 1228 release_sock(sk); 1229 } 1230 #endif 1231 return err; 1232 } 1233 EXPORT_SYMBOL(compat_ip_setsockopt); 1234 #endif 1235 1236 /* 1237 * Get the options. Note for future reference. The GET of IP options gets 1238 * the _received_ ones. The set sets the _sent_ ones. 1239 */ 1240 1241 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1242 char __user *optval, int __user *optlen, unsigned int flags) 1243 { 1244 struct inet_sock *inet = inet_sk(sk); 1245 int val; 1246 int len; 1247 1248 if (level != SOL_IP) 1249 return -EOPNOTSUPP; 1250 1251 if (ip_mroute_opt(optname)) 1252 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1253 1254 if (get_user(len, optlen)) 1255 return -EFAULT; 1256 if (len < 0) 1257 return -EINVAL; 1258 1259 lock_sock(sk); 1260 1261 switch (optname) { 1262 case IP_OPTIONS: 1263 { 1264 unsigned char optbuf[sizeof(struct ip_options)+40]; 1265 struct ip_options *opt = (struct ip_options *)optbuf; 1266 struct ip_options_rcu *inet_opt; 1267 1268 inet_opt = rcu_dereference_protected(inet->inet_opt, 1269 sock_owned_by_user(sk)); 1270 opt->optlen = 0; 1271 if (inet_opt) 1272 memcpy(optbuf, &inet_opt->opt, 1273 sizeof(struct ip_options) + 1274 inet_opt->opt.optlen); 1275 release_sock(sk); 1276 1277 if (opt->optlen == 0) 1278 return put_user(0, optlen); 1279 1280 ip_options_undo(opt); 1281 1282 len = min_t(unsigned int, len, opt->optlen); 1283 if (put_user(len, optlen)) 1284 return -EFAULT; 1285 if (copy_to_user(optval, opt->__data, len)) 1286 return -EFAULT; 1287 return 0; 1288 } 1289 case IP_PKTINFO: 1290 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1291 break; 1292 case IP_RECVTTL: 1293 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1294 break; 1295 case IP_RECVTOS: 1296 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1297 break; 1298 case IP_RECVOPTS: 1299 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1300 break; 1301 case IP_RETOPTS: 1302 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1303 break; 1304 case IP_PASSSEC: 1305 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1306 break; 1307 case IP_RECVORIGDSTADDR: 1308 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1309 break; 1310 case IP_CHECKSUM: 1311 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1312 break; 1313 case IP_TOS: 1314 val = inet->tos; 1315 break; 1316 case IP_TTL: 1317 val = (inet->uc_ttl == -1 ? 1318 sysctl_ip_default_ttl : 1319 inet->uc_ttl); 1320 break; 1321 case IP_HDRINCL: 1322 val = inet->hdrincl; 1323 break; 1324 case IP_NODEFRAG: 1325 val = inet->nodefrag; 1326 break; 1327 case IP_MTU_DISCOVER: 1328 val = inet->pmtudisc; 1329 break; 1330 case IP_MTU: 1331 { 1332 struct dst_entry *dst; 1333 val = 0; 1334 dst = sk_dst_get(sk); 1335 if (dst) { 1336 val = dst_mtu(dst); 1337 dst_release(dst); 1338 } 1339 if (!val) { 1340 release_sock(sk); 1341 return -ENOTCONN; 1342 } 1343 break; 1344 } 1345 case IP_RECVERR: 1346 val = inet->recverr; 1347 break; 1348 case IP_MULTICAST_TTL: 1349 val = inet->mc_ttl; 1350 break; 1351 case IP_MULTICAST_LOOP: 1352 val = inet->mc_loop; 1353 break; 1354 case IP_UNICAST_IF: 1355 val = (__force int)htonl((__u32) inet->uc_index); 1356 break; 1357 case IP_MULTICAST_IF: 1358 { 1359 struct in_addr addr; 1360 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1361 addr.s_addr = inet->mc_addr; 1362 release_sock(sk); 1363 1364 if (put_user(len, optlen)) 1365 return -EFAULT; 1366 if (copy_to_user(optval, &addr, len)) 1367 return -EFAULT; 1368 return 0; 1369 } 1370 case IP_MSFILTER: 1371 { 1372 struct ip_msfilter msf; 1373 int err; 1374 1375 if (len < IP_MSFILTER_SIZE(0)) { 1376 release_sock(sk); 1377 return -EINVAL; 1378 } 1379 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1380 release_sock(sk); 1381 return -EFAULT; 1382 } 1383 err = ip_mc_msfget(sk, &msf, 1384 (struct ip_msfilter __user *)optval, optlen); 1385 release_sock(sk); 1386 return err; 1387 } 1388 case MCAST_MSFILTER: 1389 { 1390 struct group_filter gsf; 1391 int err; 1392 1393 if (len < GROUP_FILTER_SIZE(0)) { 1394 release_sock(sk); 1395 return -EINVAL; 1396 } 1397 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1398 release_sock(sk); 1399 return -EFAULT; 1400 } 1401 err = ip_mc_gsfget(sk, &gsf, 1402 (struct group_filter __user *)optval, 1403 optlen); 1404 release_sock(sk); 1405 return err; 1406 } 1407 case IP_MULTICAST_ALL: 1408 val = inet->mc_all; 1409 break; 1410 case IP_PKTOPTIONS: 1411 { 1412 struct msghdr msg; 1413 1414 release_sock(sk); 1415 1416 if (sk->sk_type != SOCK_STREAM) 1417 return -ENOPROTOOPT; 1418 1419 msg.msg_control = (__force void *) optval; 1420 msg.msg_controllen = len; 1421 msg.msg_flags = flags; 1422 1423 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1424 struct in_pktinfo info; 1425 1426 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1427 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1428 info.ipi_ifindex = inet->mc_index; 1429 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1430 } 1431 if (inet->cmsg_flags & IP_CMSG_TTL) { 1432 int hlim = inet->mc_ttl; 1433 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1434 } 1435 if (inet->cmsg_flags & IP_CMSG_TOS) { 1436 int tos = inet->rcv_tos; 1437 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1438 } 1439 len -= msg.msg_controllen; 1440 return put_user(len, optlen); 1441 } 1442 case IP_FREEBIND: 1443 val = inet->freebind; 1444 break; 1445 case IP_TRANSPARENT: 1446 val = inet->transparent; 1447 break; 1448 case IP_MINTTL: 1449 val = inet->min_ttl; 1450 break; 1451 default: 1452 release_sock(sk); 1453 return -ENOPROTOOPT; 1454 } 1455 release_sock(sk); 1456 1457 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1458 unsigned char ucval = (unsigned char)val; 1459 len = 1; 1460 if (put_user(len, optlen)) 1461 return -EFAULT; 1462 if (copy_to_user(optval, &ucval, 1)) 1463 return -EFAULT; 1464 } else { 1465 len = min_t(unsigned int, sizeof(int), len); 1466 if (put_user(len, optlen)) 1467 return -EFAULT; 1468 if (copy_to_user(optval, &val, len)) 1469 return -EFAULT; 1470 } 1471 return 0; 1472 } 1473 1474 int ip_getsockopt(struct sock *sk, int level, 1475 int optname, char __user *optval, int __user *optlen) 1476 { 1477 int err; 1478 1479 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1480 #ifdef CONFIG_NETFILTER 1481 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1482 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1483 !ip_mroute_opt(optname)) { 1484 int len; 1485 1486 if (get_user(len, optlen)) 1487 return -EFAULT; 1488 1489 lock_sock(sk); 1490 err = nf_getsockopt(sk, PF_INET, optname, optval, 1491 &len); 1492 release_sock(sk); 1493 if (err >= 0) 1494 err = put_user(len, optlen); 1495 return err; 1496 } 1497 #endif 1498 return err; 1499 } 1500 EXPORT_SYMBOL(ip_getsockopt); 1501 1502 #ifdef CONFIG_COMPAT 1503 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1504 char __user *optval, int __user *optlen) 1505 { 1506 int err; 1507 1508 if (optname == MCAST_MSFILTER) 1509 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1510 ip_getsockopt); 1511 1512 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1513 MSG_CMSG_COMPAT); 1514 1515 #ifdef CONFIG_NETFILTER 1516 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1517 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1518 !ip_mroute_opt(optname)) { 1519 int len; 1520 1521 if (get_user(len, optlen)) 1522 return -EFAULT; 1523 1524 lock_sock(sk); 1525 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1526 release_sock(sk); 1527 if (err >= 0) 1528 err = put_user(len, optlen); 1529 return err; 1530 } 1531 #endif 1532 return err; 1533 } 1534 EXPORT_SYMBOL(compat_ip_getsockopt); 1535 #endif 1536