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)); 252 253 /* Our caller is responsible for freeing ipc->opt */ 254 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 255 err < 40 ? err : 40); 256 if (err) 257 return err; 258 break; 259 case IP_PKTINFO: 260 { 261 struct in_pktinfo *info; 262 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 263 return -EINVAL; 264 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 265 ipc->oif = info->ipi_ifindex; 266 ipc->addr = info->ipi_spec_dst.s_addr; 267 break; 268 } 269 case IP_TTL: 270 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 271 return -EINVAL; 272 val = *(int *)CMSG_DATA(cmsg); 273 if (val < 1 || val > 255) 274 return -EINVAL; 275 ipc->ttl = val; 276 break; 277 case IP_TOS: 278 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 279 return -EINVAL; 280 val = *(int *)CMSG_DATA(cmsg); 281 if (val < 0 || val > 255) 282 return -EINVAL; 283 ipc->tos = val; 284 ipc->priority = rt_tos2priority(ipc->tos); 285 break; 286 287 default: 288 return -EINVAL; 289 } 290 } 291 return 0; 292 } 293 294 295 /* Special input handler for packets caught by router alert option. 296 They are selected only by protocol field, and then processed likely 297 local ones; but only if someone wants them! Otherwise, router 298 not running rsvpd will kill RSVP. 299 300 It is user level problem, what it will make with them. 301 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 302 but receiver should be enough clever f.e. to forward mtrace requests, 303 sent to multicast group to reach destination designated router. 304 */ 305 struct ip_ra_chain __rcu *ip_ra_chain; 306 static DEFINE_SPINLOCK(ip_ra_lock); 307 308 309 static void ip_ra_destroy_rcu(struct rcu_head *head) 310 { 311 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 312 313 sock_put(ra->saved_sk); 314 kfree(ra); 315 } 316 317 int ip_ra_control(struct sock *sk, unsigned char on, 318 void (*destructor)(struct sock *)) 319 { 320 struct ip_ra_chain *ra, *new_ra; 321 struct ip_ra_chain __rcu **rap; 322 323 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 324 return -EINVAL; 325 326 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 327 328 spin_lock_bh(&ip_ra_lock); 329 for (rap = &ip_ra_chain; 330 (ra = rcu_dereference_protected(*rap, 331 lockdep_is_held(&ip_ra_lock))) != NULL; 332 rap = &ra->next) { 333 if (ra->sk == sk) { 334 if (on) { 335 spin_unlock_bh(&ip_ra_lock); 336 kfree(new_ra); 337 return -EADDRINUSE; 338 } 339 /* dont let ip_call_ra_chain() use sk again */ 340 ra->sk = NULL; 341 RCU_INIT_POINTER(*rap, ra->next); 342 spin_unlock_bh(&ip_ra_lock); 343 344 if (ra->destructor) 345 ra->destructor(sk); 346 /* 347 * Delay sock_put(sk) and kfree(ra) after one rcu grace 348 * period. This guarantee ip_call_ra_chain() dont need 349 * to mess with socket refcounts. 350 */ 351 ra->saved_sk = sk; 352 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 353 return 0; 354 } 355 } 356 if (!new_ra) { 357 spin_unlock_bh(&ip_ra_lock); 358 return -ENOBUFS; 359 } 360 new_ra->sk = sk; 361 new_ra->destructor = destructor; 362 363 RCU_INIT_POINTER(new_ra->next, ra); 364 rcu_assign_pointer(*rap, new_ra); 365 sock_hold(sk); 366 spin_unlock_bh(&ip_ra_lock); 367 368 return 0; 369 } 370 371 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 372 __be16 port, u32 info, u8 *payload) 373 { 374 struct sock_exterr_skb *serr; 375 376 skb = skb_clone(skb, GFP_ATOMIC); 377 if (!skb) 378 return; 379 380 serr = SKB_EXT_ERR(skb); 381 serr->ee.ee_errno = err; 382 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 383 serr->ee.ee_type = icmp_hdr(skb)->type; 384 serr->ee.ee_code = icmp_hdr(skb)->code; 385 serr->ee.ee_pad = 0; 386 serr->ee.ee_info = info; 387 serr->ee.ee_data = 0; 388 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 389 skb_network_header(skb); 390 serr->port = port; 391 392 if (skb_pull(skb, payload - skb->data)) { 393 skb_reset_transport_header(skb); 394 if (sock_queue_err_skb(sk, skb) == 0) 395 return; 396 } 397 kfree_skb(skb); 398 } 399 400 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 401 { 402 struct inet_sock *inet = inet_sk(sk); 403 struct sock_exterr_skb *serr; 404 struct iphdr *iph; 405 struct sk_buff *skb; 406 407 if (!inet->recverr) 408 return; 409 410 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 411 if (!skb) 412 return; 413 414 skb_put(skb, sizeof(struct iphdr)); 415 skb_reset_network_header(skb); 416 iph = ip_hdr(skb); 417 iph->daddr = daddr; 418 419 serr = SKB_EXT_ERR(skb); 420 serr->ee.ee_errno = err; 421 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 422 serr->ee.ee_type = 0; 423 serr->ee.ee_code = 0; 424 serr->ee.ee_pad = 0; 425 serr->ee.ee_info = info; 426 serr->ee.ee_data = 0; 427 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 428 serr->port = port; 429 430 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 431 skb_reset_transport_header(skb); 432 433 if (sock_queue_err_skb(sk, skb)) 434 kfree_skb(skb); 435 } 436 437 /* For some errors we have valid addr_offset even with zero payload and 438 * zero port. Also, addr_offset should be supported if port is set. 439 */ 440 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 441 { 442 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 443 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 444 } 445 446 /* IPv4 supports cmsg on all imcp errors and some timestamps 447 * 448 * Timestamp code paths do not initialize the fields expected by cmsg: 449 * the PKTINFO fields in skb->cb[]. Fill those in here. 450 */ 451 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 452 struct sk_buff *skb, 453 int ee_origin) 454 { 455 struct in_pktinfo *info; 456 457 if (ee_origin == SO_EE_ORIGIN_ICMP) 458 return true; 459 460 if (ee_origin == SO_EE_ORIGIN_LOCAL) 461 return false; 462 463 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 464 * timestamp with egress dev. Not possible for packets without dev 465 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 466 */ 467 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 468 (!skb->dev)) 469 return false; 470 471 info = PKTINFO_SKB_CB(skb); 472 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 473 info->ipi_ifindex = skb->dev->ifindex; 474 return true; 475 } 476 477 /* 478 * Handle MSG_ERRQUEUE 479 */ 480 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 481 { 482 struct sock_exterr_skb *serr; 483 struct sk_buff *skb; 484 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 485 struct { 486 struct sock_extended_err ee; 487 struct sockaddr_in offender; 488 } errhdr; 489 int err; 490 int copied; 491 492 WARN_ON_ONCE(sk->sk_family == AF_INET6); 493 494 err = -EAGAIN; 495 skb = sock_dequeue_err_skb(sk); 496 if (!skb) 497 goto out; 498 499 copied = skb->len; 500 if (copied > len) { 501 msg->msg_flags |= MSG_TRUNC; 502 copied = len; 503 } 504 err = skb_copy_datagram_msg(skb, 0, msg, copied); 505 if (err) 506 goto out_free_skb; 507 508 sock_recv_timestamp(msg, sk, skb); 509 510 serr = SKB_EXT_ERR(skb); 511 512 if (sin && ipv4_datagram_support_addr(serr)) { 513 sin->sin_family = AF_INET; 514 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 515 serr->addr_offset); 516 sin->sin_port = serr->port; 517 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 518 *addr_len = sizeof(*sin); 519 } 520 521 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 522 sin = &errhdr.offender; 523 memset(sin, 0, sizeof(*sin)); 524 525 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 526 sin->sin_family = AF_INET; 527 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 528 if (inet_sk(sk)->cmsg_flags) 529 ip_cmsg_recv(msg, skb); 530 } 531 532 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 533 534 /* Now we could try to dump offended packet options */ 535 536 msg->msg_flags |= MSG_ERRQUEUE; 537 err = copied; 538 539 out_free_skb: 540 kfree_skb(skb); 541 out: 542 return err; 543 } 544 545 546 /* 547 * Socket option code for IP. This is the end of the line after any 548 * TCP,UDP etc options on an IP socket. 549 */ 550 static bool setsockopt_needs_rtnl(int optname) 551 { 552 switch (optname) { 553 case IP_ADD_MEMBERSHIP: 554 case IP_ADD_SOURCE_MEMBERSHIP: 555 case IP_BLOCK_SOURCE: 556 case IP_DROP_MEMBERSHIP: 557 case IP_DROP_SOURCE_MEMBERSHIP: 558 case IP_MSFILTER: 559 case IP_UNBLOCK_SOURCE: 560 case MCAST_BLOCK_SOURCE: 561 case MCAST_MSFILTER: 562 case MCAST_JOIN_GROUP: 563 case MCAST_JOIN_SOURCE_GROUP: 564 case MCAST_LEAVE_GROUP: 565 case MCAST_LEAVE_SOURCE_GROUP: 566 case MCAST_UNBLOCK_SOURCE: 567 return true; 568 } 569 return false; 570 } 571 572 static int do_ip_setsockopt(struct sock *sk, int level, 573 int optname, char __user *optval, unsigned int optlen) 574 { 575 struct inet_sock *inet = inet_sk(sk); 576 int val = 0, err; 577 bool needs_rtnl = setsockopt_needs_rtnl(optname); 578 579 switch (optname) { 580 case IP_PKTINFO: 581 case IP_RECVTTL: 582 case IP_RECVOPTS: 583 case IP_RECVTOS: 584 case IP_RETOPTS: 585 case IP_TOS: 586 case IP_TTL: 587 case IP_HDRINCL: 588 case IP_MTU_DISCOVER: 589 case IP_RECVERR: 590 case IP_ROUTER_ALERT: 591 case IP_FREEBIND: 592 case IP_PASSSEC: 593 case IP_TRANSPARENT: 594 case IP_MINTTL: 595 case IP_NODEFRAG: 596 case IP_BIND_ADDRESS_NO_PORT: 597 case IP_UNICAST_IF: 598 case IP_MULTICAST_TTL: 599 case IP_MULTICAST_ALL: 600 case IP_MULTICAST_LOOP: 601 case IP_RECVORIGDSTADDR: 602 case IP_CHECKSUM: 603 if (optlen >= sizeof(int)) { 604 if (get_user(val, (int __user *) optval)) 605 return -EFAULT; 606 } else if (optlen >= sizeof(char)) { 607 unsigned char ucval; 608 609 if (get_user(ucval, (unsigned char __user *) optval)) 610 return -EFAULT; 611 val = (int) ucval; 612 } 613 } 614 615 /* If optlen==0, it is equivalent to val == 0 */ 616 617 if (ip_mroute_opt(optname)) 618 return ip_mroute_setsockopt(sk, optname, optval, optlen); 619 620 err = 0; 621 if (needs_rtnl) 622 rtnl_lock(); 623 lock_sock(sk); 624 625 switch (optname) { 626 case IP_OPTIONS: 627 { 628 struct ip_options_rcu *old, *opt = NULL; 629 630 if (optlen > 40) 631 goto e_inval; 632 err = ip_options_get_from_user(sock_net(sk), &opt, 633 optval, optlen); 634 if (err) 635 break; 636 old = rcu_dereference_protected(inet->inet_opt, 637 sock_owned_by_user(sk)); 638 if (inet->is_icsk) { 639 struct inet_connection_sock *icsk = inet_csk(sk); 640 #if IS_ENABLED(CONFIG_IPV6) 641 if (sk->sk_family == PF_INET || 642 (!((1 << sk->sk_state) & 643 (TCPF_LISTEN | TCPF_CLOSE)) && 644 inet->inet_daddr != LOOPBACK4_IPV6)) { 645 #endif 646 if (old) 647 icsk->icsk_ext_hdr_len -= old->opt.optlen; 648 if (opt) 649 icsk->icsk_ext_hdr_len += opt->opt.optlen; 650 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 651 #if IS_ENABLED(CONFIG_IPV6) 652 } 653 #endif 654 } 655 rcu_assign_pointer(inet->inet_opt, opt); 656 if (old) 657 kfree_rcu(old, rcu); 658 break; 659 } 660 case IP_PKTINFO: 661 if (val) 662 inet->cmsg_flags |= IP_CMSG_PKTINFO; 663 else 664 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 665 break; 666 case IP_RECVTTL: 667 if (val) 668 inet->cmsg_flags |= IP_CMSG_TTL; 669 else 670 inet->cmsg_flags &= ~IP_CMSG_TTL; 671 break; 672 case IP_RECVTOS: 673 if (val) 674 inet->cmsg_flags |= IP_CMSG_TOS; 675 else 676 inet->cmsg_flags &= ~IP_CMSG_TOS; 677 break; 678 case IP_RECVOPTS: 679 if (val) 680 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 681 else 682 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 683 break; 684 case IP_RETOPTS: 685 if (val) 686 inet->cmsg_flags |= IP_CMSG_RETOPTS; 687 else 688 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 689 break; 690 case IP_PASSSEC: 691 if (val) 692 inet->cmsg_flags |= IP_CMSG_PASSSEC; 693 else 694 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 695 break; 696 case IP_RECVORIGDSTADDR: 697 if (val) 698 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 699 else 700 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 701 break; 702 case IP_CHECKSUM: 703 if (val) { 704 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 705 inet_inc_convert_csum(sk); 706 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 707 } 708 } else { 709 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 710 inet_dec_convert_csum(sk); 711 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 712 } 713 } 714 break; 715 case IP_TOS: /* This sets both TOS and Precedence */ 716 if (sk->sk_type == SOCK_STREAM) { 717 val &= ~INET_ECN_MASK; 718 val |= inet->tos & INET_ECN_MASK; 719 } 720 if (inet->tos != val) { 721 inet->tos = val; 722 sk->sk_priority = rt_tos2priority(val); 723 sk_dst_reset(sk); 724 } 725 break; 726 case IP_TTL: 727 if (optlen < 1) 728 goto e_inval; 729 if (val != -1 && (val < 1 || val > 255)) 730 goto e_inval; 731 inet->uc_ttl = val; 732 break; 733 case IP_HDRINCL: 734 if (sk->sk_type != SOCK_RAW) { 735 err = -ENOPROTOOPT; 736 break; 737 } 738 inet->hdrincl = val ? 1 : 0; 739 break; 740 case IP_NODEFRAG: 741 if (sk->sk_type != SOCK_RAW) { 742 err = -ENOPROTOOPT; 743 break; 744 } 745 inet->nodefrag = val ? 1 : 0; 746 break; 747 case IP_BIND_ADDRESS_NO_PORT: 748 inet->bind_address_no_port = val ? 1 : 0; 749 break; 750 case IP_MTU_DISCOVER: 751 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 752 goto e_inval; 753 inet->pmtudisc = val; 754 break; 755 case IP_RECVERR: 756 inet->recverr = !!val; 757 if (!val) 758 skb_queue_purge(&sk->sk_error_queue); 759 break; 760 case IP_MULTICAST_TTL: 761 if (sk->sk_type == SOCK_STREAM) 762 goto e_inval; 763 if (optlen < 1) 764 goto e_inval; 765 if (val == -1) 766 val = 1; 767 if (val < 0 || val > 255) 768 goto e_inval; 769 inet->mc_ttl = val; 770 break; 771 case IP_MULTICAST_LOOP: 772 if (optlen < 1) 773 goto e_inval; 774 inet->mc_loop = !!val; 775 break; 776 case IP_UNICAST_IF: 777 { 778 struct net_device *dev = NULL; 779 int ifindex; 780 781 if (optlen != sizeof(int)) 782 goto e_inval; 783 784 ifindex = (__force int)ntohl((__force __be32)val); 785 if (ifindex == 0) { 786 inet->uc_index = 0; 787 err = 0; 788 break; 789 } 790 791 dev = dev_get_by_index(sock_net(sk), ifindex); 792 err = -EADDRNOTAVAIL; 793 if (!dev) 794 break; 795 dev_put(dev); 796 797 err = -EINVAL; 798 if (sk->sk_bound_dev_if) 799 break; 800 801 inet->uc_index = ifindex; 802 err = 0; 803 break; 804 } 805 case IP_MULTICAST_IF: 806 { 807 struct ip_mreqn mreq; 808 struct net_device *dev = NULL; 809 810 if (sk->sk_type == SOCK_STREAM) 811 goto e_inval; 812 /* 813 * Check the arguments are allowable 814 */ 815 816 if (optlen < sizeof(struct in_addr)) 817 goto e_inval; 818 819 err = -EFAULT; 820 if (optlen >= sizeof(struct ip_mreqn)) { 821 if (copy_from_user(&mreq, optval, sizeof(mreq))) 822 break; 823 } else { 824 memset(&mreq, 0, sizeof(mreq)); 825 if (optlen >= sizeof(struct ip_mreq)) { 826 if (copy_from_user(&mreq, optval, 827 sizeof(struct ip_mreq))) 828 break; 829 } else if (optlen >= sizeof(struct in_addr)) { 830 if (copy_from_user(&mreq.imr_address, optval, 831 sizeof(struct in_addr))) 832 break; 833 } 834 } 835 836 if (!mreq.imr_ifindex) { 837 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 838 inet->mc_index = 0; 839 inet->mc_addr = 0; 840 err = 0; 841 break; 842 } 843 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 844 if (dev) 845 mreq.imr_ifindex = dev->ifindex; 846 } else 847 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 848 849 850 err = -EADDRNOTAVAIL; 851 if (!dev) 852 break; 853 dev_put(dev); 854 855 err = -EINVAL; 856 if (sk->sk_bound_dev_if && 857 mreq.imr_ifindex != sk->sk_bound_dev_if) 858 break; 859 860 inet->mc_index = mreq.imr_ifindex; 861 inet->mc_addr = mreq.imr_address.s_addr; 862 err = 0; 863 break; 864 } 865 866 case IP_ADD_MEMBERSHIP: 867 case IP_DROP_MEMBERSHIP: 868 { 869 struct ip_mreqn mreq; 870 871 err = -EPROTO; 872 if (inet_sk(sk)->is_icsk) 873 break; 874 875 if (optlen < sizeof(struct ip_mreq)) 876 goto e_inval; 877 err = -EFAULT; 878 if (optlen >= sizeof(struct ip_mreqn)) { 879 if (copy_from_user(&mreq, optval, sizeof(mreq))) 880 break; 881 } else { 882 memset(&mreq, 0, sizeof(mreq)); 883 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 884 break; 885 } 886 887 if (optname == IP_ADD_MEMBERSHIP) 888 err = ip_mc_join_group(sk, &mreq); 889 else 890 err = ip_mc_leave_group(sk, &mreq); 891 break; 892 } 893 case IP_MSFILTER: 894 { 895 struct ip_msfilter *msf; 896 897 if (optlen < IP_MSFILTER_SIZE(0)) 898 goto e_inval; 899 if (optlen > sysctl_optmem_max) { 900 err = -ENOBUFS; 901 break; 902 } 903 msf = kmalloc(optlen, GFP_KERNEL); 904 if (!msf) { 905 err = -ENOBUFS; 906 break; 907 } 908 err = -EFAULT; 909 if (copy_from_user(msf, optval, optlen)) { 910 kfree(msf); 911 break; 912 } 913 /* numsrc >= (1G-4) overflow in 32 bits */ 914 if (msf->imsf_numsrc >= 0x3ffffffcU || 915 msf->imsf_numsrc > sysctl_igmp_max_msf) { 916 kfree(msf); 917 err = -ENOBUFS; 918 break; 919 } 920 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 921 kfree(msf); 922 err = -EINVAL; 923 break; 924 } 925 err = ip_mc_msfilter(sk, msf, 0); 926 kfree(msf); 927 break; 928 } 929 case IP_BLOCK_SOURCE: 930 case IP_UNBLOCK_SOURCE: 931 case IP_ADD_SOURCE_MEMBERSHIP: 932 case IP_DROP_SOURCE_MEMBERSHIP: 933 { 934 struct ip_mreq_source mreqs; 935 int omode, add; 936 937 if (optlen != sizeof(struct ip_mreq_source)) 938 goto e_inval; 939 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 940 err = -EFAULT; 941 break; 942 } 943 if (optname == IP_BLOCK_SOURCE) { 944 omode = MCAST_EXCLUDE; 945 add = 1; 946 } else if (optname == IP_UNBLOCK_SOURCE) { 947 omode = MCAST_EXCLUDE; 948 add = 0; 949 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 950 struct ip_mreqn mreq; 951 952 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 953 mreq.imr_address.s_addr = mreqs.imr_interface; 954 mreq.imr_ifindex = 0; 955 err = ip_mc_join_group(sk, &mreq); 956 if (err && err != -EADDRINUSE) 957 break; 958 omode = MCAST_INCLUDE; 959 add = 1; 960 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 961 omode = MCAST_INCLUDE; 962 add = 0; 963 } 964 err = ip_mc_source(add, omode, sk, &mreqs, 0); 965 break; 966 } 967 case MCAST_JOIN_GROUP: 968 case MCAST_LEAVE_GROUP: 969 { 970 struct group_req greq; 971 struct sockaddr_in *psin; 972 struct ip_mreqn mreq; 973 974 if (optlen < sizeof(struct group_req)) 975 goto e_inval; 976 err = -EFAULT; 977 if (copy_from_user(&greq, optval, sizeof(greq))) 978 break; 979 psin = (struct sockaddr_in *)&greq.gr_group; 980 if (psin->sin_family != AF_INET) 981 goto e_inval; 982 memset(&mreq, 0, sizeof(mreq)); 983 mreq.imr_multiaddr = psin->sin_addr; 984 mreq.imr_ifindex = greq.gr_interface; 985 986 if (optname == MCAST_JOIN_GROUP) 987 err = ip_mc_join_group(sk, &mreq); 988 else 989 err = ip_mc_leave_group(sk, &mreq); 990 break; 991 } 992 case MCAST_JOIN_SOURCE_GROUP: 993 case MCAST_LEAVE_SOURCE_GROUP: 994 case MCAST_BLOCK_SOURCE: 995 case MCAST_UNBLOCK_SOURCE: 996 { 997 struct group_source_req greqs; 998 struct ip_mreq_source mreqs; 999 struct sockaddr_in *psin; 1000 int omode, add; 1001 1002 if (optlen != sizeof(struct group_source_req)) 1003 goto e_inval; 1004 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1005 err = -EFAULT; 1006 break; 1007 } 1008 if (greqs.gsr_group.ss_family != AF_INET || 1009 greqs.gsr_source.ss_family != AF_INET) { 1010 err = -EADDRNOTAVAIL; 1011 break; 1012 } 1013 psin = (struct sockaddr_in *)&greqs.gsr_group; 1014 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1015 psin = (struct sockaddr_in *)&greqs.gsr_source; 1016 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1017 mreqs.imr_interface = 0; /* use index for mc_source */ 1018 1019 if (optname == MCAST_BLOCK_SOURCE) { 1020 omode = MCAST_EXCLUDE; 1021 add = 1; 1022 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1023 omode = MCAST_EXCLUDE; 1024 add = 0; 1025 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1026 struct ip_mreqn mreq; 1027 1028 psin = (struct sockaddr_in *)&greqs.gsr_group; 1029 mreq.imr_multiaddr = psin->sin_addr; 1030 mreq.imr_address.s_addr = 0; 1031 mreq.imr_ifindex = greqs.gsr_interface; 1032 err = ip_mc_join_group(sk, &mreq); 1033 if (err && err != -EADDRINUSE) 1034 break; 1035 greqs.gsr_interface = mreq.imr_ifindex; 1036 omode = MCAST_INCLUDE; 1037 add = 1; 1038 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1039 omode = MCAST_INCLUDE; 1040 add = 0; 1041 } 1042 err = ip_mc_source(add, omode, sk, &mreqs, 1043 greqs.gsr_interface); 1044 break; 1045 } 1046 case MCAST_MSFILTER: 1047 { 1048 struct sockaddr_in *psin; 1049 struct ip_msfilter *msf = NULL; 1050 struct group_filter *gsf = NULL; 1051 int msize, i, ifindex; 1052 1053 if (optlen < GROUP_FILTER_SIZE(0)) 1054 goto e_inval; 1055 if (optlen > sysctl_optmem_max) { 1056 err = -ENOBUFS; 1057 break; 1058 } 1059 gsf = kmalloc(optlen, GFP_KERNEL); 1060 if (!gsf) { 1061 err = -ENOBUFS; 1062 break; 1063 } 1064 err = -EFAULT; 1065 if (copy_from_user(gsf, optval, optlen)) 1066 goto mc_msf_out; 1067 1068 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1069 if (gsf->gf_numsrc >= 0x1ffffff || 1070 gsf->gf_numsrc > sysctl_igmp_max_msf) { 1071 err = -ENOBUFS; 1072 goto mc_msf_out; 1073 } 1074 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1075 err = -EINVAL; 1076 goto mc_msf_out; 1077 } 1078 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1079 msf = kmalloc(msize, GFP_KERNEL); 1080 if (!msf) { 1081 err = -ENOBUFS; 1082 goto mc_msf_out; 1083 } 1084 ifindex = gsf->gf_interface; 1085 psin = (struct sockaddr_in *)&gsf->gf_group; 1086 if (psin->sin_family != AF_INET) { 1087 err = -EADDRNOTAVAIL; 1088 goto mc_msf_out; 1089 } 1090 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1091 msf->imsf_interface = 0; 1092 msf->imsf_fmode = gsf->gf_fmode; 1093 msf->imsf_numsrc = gsf->gf_numsrc; 1094 err = -EADDRNOTAVAIL; 1095 for (i = 0; i < gsf->gf_numsrc; ++i) { 1096 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1097 1098 if (psin->sin_family != AF_INET) 1099 goto mc_msf_out; 1100 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1101 } 1102 kfree(gsf); 1103 gsf = NULL; 1104 1105 err = ip_mc_msfilter(sk, msf, ifindex); 1106 mc_msf_out: 1107 kfree(msf); 1108 kfree(gsf); 1109 break; 1110 } 1111 case IP_MULTICAST_ALL: 1112 if (optlen < 1) 1113 goto e_inval; 1114 if (val != 0 && val != 1) 1115 goto e_inval; 1116 inet->mc_all = val; 1117 break; 1118 case IP_ROUTER_ALERT: 1119 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1120 break; 1121 1122 case IP_FREEBIND: 1123 if (optlen < 1) 1124 goto e_inval; 1125 inet->freebind = !!val; 1126 break; 1127 1128 case IP_IPSEC_POLICY: 1129 case IP_XFRM_POLICY: 1130 err = -EPERM; 1131 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1132 break; 1133 err = xfrm_user_policy(sk, optname, optval, optlen); 1134 break; 1135 1136 case IP_TRANSPARENT: 1137 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1138 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1139 err = -EPERM; 1140 break; 1141 } 1142 if (optlen < 1) 1143 goto e_inval; 1144 inet->transparent = !!val; 1145 break; 1146 1147 case IP_MINTTL: 1148 if (optlen < 1) 1149 goto e_inval; 1150 if (val < 0 || val > 255) 1151 goto e_inval; 1152 inet->min_ttl = val; 1153 break; 1154 1155 default: 1156 err = -ENOPROTOOPT; 1157 break; 1158 } 1159 release_sock(sk); 1160 if (needs_rtnl) 1161 rtnl_unlock(); 1162 return err; 1163 1164 e_inval: 1165 release_sock(sk); 1166 if (needs_rtnl) 1167 rtnl_unlock(); 1168 return -EINVAL; 1169 } 1170 1171 /** 1172 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1173 * @sk: socket 1174 * @skb: buffer 1175 * 1176 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1177 * destination in skb->cb[] before dst drop. 1178 * This way, receiver doesn't make cache line misses to read rtable. 1179 */ 1180 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1181 { 1182 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1183 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1184 ipv6_sk_rxinfo(sk); 1185 1186 if (prepare && skb_rtable(skb)) { 1187 pktinfo->ipi_ifindex = inet_iif(skb); 1188 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1189 } else { 1190 pktinfo->ipi_ifindex = 0; 1191 pktinfo->ipi_spec_dst.s_addr = 0; 1192 } 1193 skb_dst_drop(skb); 1194 } 1195 1196 int ip_setsockopt(struct sock *sk, int level, 1197 int optname, char __user *optval, unsigned int optlen) 1198 { 1199 int err; 1200 1201 if (level != SOL_IP) 1202 return -ENOPROTOOPT; 1203 1204 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1205 #ifdef CONFIG_NETFILTER 1206 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1207 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1208 optname != IP_IPSEC_POLICY && 1209 optname != IP_XFRM_POLICY && 1210 !ip_mroute_opt(optname)) { 1211 lock_sock(sk); 1212 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1213 release_sock(sk); 1214 } 1215 #endif 1216 return err; 1217 } 1218 EXPORT_SYMBOL(ip_setsockopt); 1219 1220 #ifdef CONFIG_COMPAT 1221 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1222 char __user *optval, unsigned int optlen) 1223 { 1224 int err; 1225 1226 if (level != SOL_IP) 1227 return -ENOPROTOOPT; 1228 1229 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1230 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1231 ip_setsockopt); 1232 1233 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1234 #ifdef CONFIG_NETFILTER 1235 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1236 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1237 optname != IP_IPSEC_POLICY && 1238 optname != IP_XFRM_POLICY && 1239 !ip_mroute_opt(optname)) { 1240 lock_sock(sk); 1241 err = compat_nf_setsockopt(sk, PF_INET, optname, 1242 optval, optlen); 1243 release_sock(sk); 1244 } 1245 #endif 1246 return err; 1247 } 1248 EXPORT_SYMBOL(compat_ip_setsockopt); 1249 #endif 1250 1251 /* 1252 * Get the options. Note for future reference. The GET of IP options gets 1253 * the _received_ ones. The set sets the _sent_ ones. 1254 */ 1255 1256 static bool getsockopt_needs_rtnl(int optname) 1257 { 1258 switch (optname) { 1259 case IP_MSFILTER: 1260 case MCAST_MSFILTER: 1261 return true; 1262 } 1263 return false; 1264 } 1265 1266 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1267 char __user *optval, int __user *optlen, unsigned int flags) 1268 { 1269 struct inet_sock *inet = inet_sk(sk); 1270 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1271 int val, err = 0; 1272 int len; 1273 1274 if (level != SOL_IP) 1275 return -EOPNOTSUPP; 1276 1277 if (ip_mroute_opt(optname)) 1278 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1279 1280 if (get_user(len, optlen)) 1281 return -EFAULT; 1282 if (len < 0) 1283 return -EINVAL; 1284 1285 if (needs_rtnl) 1286 rtnl_lock(); 1287 lock_sock(sk); 1288 1289 switch (optname) { 1290 case IP_OPTIONS: 1291 { 1292 unsigned char optbuf[sizeof(struct ip_options)+40]; 1293 struct ip_options *opt = (struct ip_options *)optbuf; 1294 struct ip_options_rcu *inet_opt; 1295 1296 inet_opt = rcu_dereference_protected(inet->inet_opt, 1297 sock_owned_by_user(sk)); 1298 opt->optlen = 0; 1299 if (inet_opt) 1300 memcpy(optbuf, &inet_opt->opt, 1301 sizeof(struct ip_options) + 1302 inet_opt->opt.optlen); 1303 release_sock(sk); 1304 1305 if (opt->optlen == 0) 1306 return put_user(0, optlen); 1307 1308 ip_options_undo(opt); 1309 1310 len = min_t(unsigned int, len, opt->optlen); 1311 if (put_user(len, optlen)) 1312 return -EFAULT; 1313 if (copy_to_user(optval, opt->__data, len)) 1314 return -EFAULT; 1315 return 0; 1316 } 1317 case IP_PKTINFO: 1318 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1319 break; 1320 case IP_RECVTTL: 1321 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1322 break; 1323 case IP_RECVTOS: 1324 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1325 break; 1326 case IP_RECVOPTS: 1327 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1328 break; 1329 case IP_RETOPTS: 1330 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1331 break; 1332 case IP_PASSSEC: 1333 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1334 break; 1335 case IP_RECVORIGDSTADDR: 1336 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1337 break; 1338 case IP_CHECKSUM: 1339 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1340 break; 1341 case IP_TOS: 1342 val = inet->tos; 1343 break; 1344 case IP_TTL: 1345 val = (inet->uc_ttl == -1 ? 1346 sysctl_ip_default_ttl : 1347 inet->uc_ttl); 1348 break; 1349 case IP_HDRINCL: 1350 val = inet->hdrincl; 1351 break; 1352 case IP_NODEFRAG: 1353 val = inet->nodefrag; 1354 break; 1355 case IP_BIND_ADDRESS_NO_PORT: 1356 val = inet->bind_address_no_port; 1357 break; 1358 case IP_MTU_DISCOVER: 1359 val = inet->pmtudisc; 1360 break; 1361 case IP_MTU: 1362 { 1363 struct dst_entry *dst; 1364 val = 0; 1365 dst = sk_dst_get(sk); 1366 if (dst) { 1367 val = dst_mtu(dst); 1368 dst_release(dst); 1369 } 1370 if (!val) { 1371 release_sock(sk); 1372 return -ENOTCONN; 1373 } 1374 break; 1375 } 1376 case IP_RECVERR: 1377 val = inet->recverr; 1378 break; 1379 case IP_MULTICAST_TTL: 1380 val = inet->mc_ttl; 1381 break; 1382 case IP_MULTICAST_LOOP: 1383 val = inet->mc_loop; 1384 break; 1385 case IP_UNICAST_IF: 1386 val = (__force int)htonl((__u32) inet->uc_index); 1387 break; 1388 case IP_MULTICAST_IF: 1389 { 1390 struct in_addr addr; 1391 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1392 addr.s_addr = inet->mc_addr; 1393 release_sock(sk); 1394 1395 if (put_user(len, optlen)) 1396 return -EFAULT; 1397 if (copy_to_user(optval, &addr, len)) 1398 return -EFAULT; 1399 return 0; 1400 } 1401 case IP_MSFILTER: 1402 { 1403 struct ip_msfilter msf; 1404 1405 if (len < IP_MSFILTER_SIZE(0)) { 1406 err = -EINVAL; 1407 goto out; 1408 } 1409 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1410 err = -EFAULT; 1411 goto out; 1412 } 1413 err = ip_mc_msfget(sk, &msf, 1414 (struct ip_msfilter __user *)optval, optlen); 1415 goto out; 1416 } 1417 case MCAST_MSFILTER: 1418 { 1419 struct group_filter gsf; 1420 1421 if (len < GROUP_FILTER_SIZE(0)) { 1422 err = -EINVAL; 1423 goto out; 1424 } 1425 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1426 err = -EFAULT; 1427 goto out; 1428 } 1429 err = ip_mc_gsfget(sk, &gsf, 1430 (struct group_filter __user *)optval, 1431 optlen); 1432 goto out; 1433 } 1434 case IP_MULTICAST_ALL: 1435 val = inet->mc_all; 1436 break; 1437 case IP_PKTOPTIONS: 1438 { 1439 struct msghdr msg; 1440 1441 release_sock(sk); 1442 1443 if (sk->sk_type != SOCK_STREAM) 1444 return -ENOPROTOOPT; 1445 1446 msg.msg_control = (__force void *) optval; 1447 msg.msg_controllen = len; 1448 msg.msg_flags = flags; 1449 1450 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1451 struct in_pktinfo info; 1452 1453 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1454 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1455 info.ipi_ifindex = inet->mc_index; 1456 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1457 } 1458 if (inet->cmsg_flags & IP_CMSG_TTL) { 1459 int hlim = inet->mc_ttl; 1460 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1461 } 1462 if (inet->cmsg_flags & IP_CMSG_TOS) { 1463 int tos = inet->rcv_tos; 1464 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1465 } 1466 len -= msg.msg_controllen; 1467 return put_user(len, optlen); 1468 } 1469 case IP_FREEBIND: 1470 val = inet->freebind; 1471 break; 1472 case IP_TRANSPARENT: 1473 val = inet->transparent; 1474 break; 1475 case IP_MINTTL: 1476 val = inet->min_ttl; 1477 break; 1478 default: 1479 release_sock(sk); 1480 return -ENOPROTOOPT; 1481 } 1482 release_sock(sk); 1483 1484 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1485 unsigned char ucval = (unsigned char)val; 1486 len = 1; 1487 if (put_user(len, optlen)) 1488 return -EFAULT; 1489 if (copy_to_user(optval, &ucval, 1)) 1490 return -EFAULT; 1491 } else { 1492 len = min_t(unsigned int, sizeof(int), len); 1493 if (put_user(len, optlen)) 1494 return -EFAULT; 1495 if (copy_to_user(optval, &val, len)) 1496 return -EFAULT; 1497 } 1498 return 0; 1499 1500 out: 1501 release_sock(sk); 1502 if (needs_rtnl) 1503 rtnl_unlock(); 1504 return err; 1505 } 1506 1507 int ip_getsockopt(struct sock *sk, int level, 1508 int optname, char __user *optval, int __user *optlen) 1509 { 1510 int err; 1511 1512 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1513 #ifdef CONFIG_NETFILTER 1514 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1515 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1516 !ip_mroute_opt(optname)) { 1517 int len; 1518 1519 if (get_user(len, optlen)) 1520 return -EFAULT; 1521 1522 lock_sock(sk); 1523 err = nf_getsockopt(sk, PF_INET, optname, optval, 1524 &len); 1525 release_sock(sk); 1526 if (err >= 0) 1527 err = put_user(len, optlen); 1528 return err; 1529 } 1530 #endif 1531 return err; 1532 } 1533 EXPORT_SYMBOL(ip_getsockopt); 1534 1535 #ifdef CONFIG_COMPAT 1536 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1537 char __user *optval, int __user *optlen) 1538 { 1539 int err; 1540 1541 if (optname == MCAST_MSFILTER) 1542 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1543 ip_getsockopt); 1544 1545 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1546 MSG_CMSG_COMPAT); 1547 1548 #ifdef CONFIG_NETFILTER 1549 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1550 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1551 !ip_mroute_opt(optname)) { 1552 int len; 1553 1554 if (get_user(len, optlen)) 1555 return -EFAULT; 1556 1557 lock_sock(sk); 1558 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1559 release_sock(sk); 1560 if (err >= 0) 1561 err = put_user(len, optlen); 1562 return err; 1563 } 1564 #endif 1565 return err; 1566 } 1567 EXPORT_SYMBOL(compat_ip_getsockopt); 1568 #endif 1569