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_transport_header(skb), 110 offset, 0)); 111 112 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 113 } 114 115 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 116 { 117 char *secdata; 118 u32 seclen, secid; 119 int err; 120 121 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 122 if (err) 123 return; 124 125 err = security_secid_to_secctx(secid, &secdata, &seclen); 126 if (err) 127 return; 128 129 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 130 security_release_secctx(secdata, seclen); 131 } 132 133 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 134 { 135 struct sockaddr_in sin; 136 const struct iphdr *iph = ip_hdr(skb); 137 __be16 *ports = (__be16 *)skb_transport_header(skb); 138 139 if (skb_transport_offset(skb) + 4 > skb->len) 140 return; 141 142 /* All current transport protocols have the port numbers in the 143 * first four bytes of the transport header and this function is 144 * written with this assumption in mind. 145 */ 146 147 sin.sin_family = AF_INET; 148 sin.sin_addr.s_addr = iph->daddr; 149 sin.sin_port = ports[1]; 150 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 151 152 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 153 } 154 155 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, 156 int offset) 157 { 158 struct inet_sock *inet = inet_sk(skb->sk); 159 unsigned int flags = inet->cmsg_flags; 160 161 /* Ordered by supposed usage frequency */ 162 if (flags & IP_CMSG_PKTINFO) { 163 ip_cmsg_recv_pktinfo(msg, skb); 164 165 flags &= ~IP_CMSG_PKTINFO; 166 if (!flags) 167 return; 168 } 169 170 if (flags & IP_CMSG_TTL) { 171 ip_cmsg_recv_ttl(msg, skb); 172 173 flags &= ~IP_CMSG_TTL; 174 if (!flags) 175 return; 176 } 177 178 if (flags & IP_CMSG_TOS) { 179 ip_cmsg_recv_tos(msg, skb); 180 181 flags &= ~IP_CMSG_TOS; 182 if (!flags) 183 return; 184 } 185 186 if (flags & IP_CMSG_RECVOPTS) { 187 ip_cmsg_recv_opts(msg, skb); 188 189 flags &= ~IP_CMSG_RECVOPTS; 190 if (!flags) 191 return; 192 } 193 194 if (flags & IP_CMSG_RETOPTS) { 195 ip_cmsg_recv_retopts(msg, skb); 196 197 flags &= ~IP_CMSG_RETOPTS; 198 if (!flags) 199 return; 200 } 201 202 if (flags & IP_CMSG_PASSSEC) { 203 ip_cmsg_recv_security(msg, skb); 204 205 flags &= ~IP_CMSG_PASSSEC; 206 if (!flags) 207 return; 208 } 209 210 if (flags & IP_CMSG_ORIGDSTADDR) { 211 ip_cmsg_recv_dstaddr(msg, skb); 212 213 flags &= ~IP_CMSG_ORIGDSTADDR; 214 if (!flags) 215 return; 216 } 217 218 if (flags & IP_CMSG_CHECKSUM) 219 ip_cmsg_recv_checksum(msg, skb, offset); 220 } 221 EXPORT_SYMBOL(ip_cmsg_recv_offset); 222 223 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 224 bool allow_ipv6) 225 { 226 int err, val; 227 struct cmsghdr *cmsg; 228 struct net *net = sock_net(sk); 229 230 for_each_cmsghdr(cmsg, msg) { 231 if (!CMSG_OK(msg, cmsg)) 232 return -EINVAL; 233 #if IS_ENABLED(CONFIG_IPV6) 234 if (allow_ipv6 && 235 cmsg->cmsg_level == SOL_IPV6 && 236 cmsg->cmsg_type == IPV6_PKTINFO) { 237 struct in6_pktinfo *src_info; 238 239 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 240 return -EINVAL; 241 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 242 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 243 return -EINVAL; 244 ipc->oif = src_info->ipi6_ifindex; 245 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 246 continue; 247 } 248 #endif 249 if (cmsg->cmsg_level == SOL_SOCKET) { 250 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 251 if (err) 252 return err; 253 continue; 254 } 255 256 if (cmsg->cmsg_level != SOL_IP) 257 continue; 258 switch (cmsg->cmsg_type) { 259 case IP_RETOPTS: 260 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 261 262 /* Our caller is responsible for freeing ipc->opt */ 263 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 264 err < 40 ? err : 40); 265 if (err) 266 return err; 267 break; 268 case IP_PKTINFO: 269 { 270 struct in_pktinfo *info; 271 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 272 return -EINVAL; 273 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 274 ipc->oif = info->ipi_ifindex; 275 ipc->addr = info->ipi_spec_dst.s_addr; 276 break; 277 } 278 case IP_TTL: 279 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 280 return -EINVAL; 281 val = *(int *)CMSG_DATA(cmsg); 282 if (val < 1 || val > 255) 283 return -EINVAL; 284 ipc->ttl = val; 285 break; 286 case IP_TOS: 287 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 288 val = *(int *)CMSG_DATA(cmsg); 289 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 290 val = *(u8 *)CMSG_DATA(cmsg); 291 else 292 return -EINVAL; 293 if (val < 0 || val > 255) 294 return -EINVAL; 295 ipc->tos = val; 296 ipc->priority = rt_tos2priority(ipc->tos); 297 break; 298 299 default: 300 return -EINVAL; 301 } 302 } 303 return 0; 304 } 305 306 307 /* Special input handler for packets caught by router alert option. 308 They are selected only by protocol field, and then processed likely 309 local ones; but only if someone wants them! Otherwise, router 310 not running rsvpd will kill RSVP. 311 312 It is user level problem, what it will make with them. 313 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 314 but receiver should be enough clever f.e. to forward mtrace requests, 315 sent to multicast group to reach destination designated router. 316 */ 317 struct ip_ra_chain __rcu *ip_ra_chain; 318 static DEFINE_SPINLOCK(ip_ra_lock); 319 320 321 static void ip_ra_destroy_rcu(struct rcu_head *head) 322 { 323 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 324 325 sock_put(ra->saved_sk); 326 kfree(ra); 327 } 328 329 int ip_ra_control(struct sock *sk, unsigned char on, 330 void (*destructor)(struct sock *)) 331 { 332 struct ip_ra_chain *ra, *new_ra; 333 struct ip_ra_chain __rcu **rap; 334 335 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 336 return -EINVAL; 337 338 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 339 340 spin_lock_bh(&ip_ra_lock); 341 for (rap = &ip_ra_chain; 342 (ra = rcu_dereference_protected(*rap, 343 lockdep_is_held(&ip_ra_lock))) != NULL; 344 rap = &ra->next) { 345 if (ra->sk == sk) { 346 if (on) { 347 spin_unlock_bh(&ip_ra_lock); 348 kfree(new_ra); 349 return -EADDRINUSE; 350 } 351 /* dont let ip_call_ra_chain() use sk again */ 352 ra->sk = NULL; 353 RCU_INIT_POINTER(*rap, ra->next); 354 spin_unlock_bh(&ip_ra_lock); 355 356 if (ra->destructor) 357 ra->destructor(sk); 358 /* 359 * Delay sock_put(sk) and kfree(ra) after one rcu grace 360 * period. This guarantee ip_call_ra_chain() dont need 361 * to mess with socket refcounts. 362 */ 363 ra->saved_sk = sk; 364 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 365 return 0; 366 } 367 } 368 if (!new_ra) { 369 spin_unlock_bh(&ip_ra_lock); 370 return -ENOBUFS; 371 } 372 new_ra->sk = sk; 373 new_ra->destructor = destructor; 374 375 RCU_INIT_POINTER(new_ra->next, ra); 376 rcu_assign_pointer(*rap, new_ra); 377 sock_hold(sk); 378 spin_unlock_bh(&ip_ra_lock); 379 380 return 0; 381 } 382 383 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 384 __be16 port, u32 info, u8 *payload) 385 { 386 struct sock_exterr_skb *serr; 387 388 skb = skb_clone(skb, GFP_ATOMIC); 389 if (!skb) 390 return; 391 392 serr = SKB_EXT_ERR(skb); 393 serr->ee.ee_errno = err; 394 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 395 serr->ee.ee_type = icmp_hdr(skb)->type; 396 serr->ee.ee_code = icmp_hdr(skb)->code; 397 serr->ee.ee_pad = 0; 398 serr->ee.ee_info = info; 399 serr->ee.ee_data = 0; 400 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 401 skb_network_header(skb); 402 serr->port = port; 403 404 if (skb_pull(skb, payload - skb->data)) { 405 skb_reset_transport_header(skb); 406 if (sock_queue_err_skb(sk, skb) == 0) 407 return; 408 } 409 kfree_skb(skb); 410 } 411 412 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 413 { 414 struct inet_sock *inet = inet_sk(sk); 415 struct sock_exterr_skb *serr; 416 struct iphdr *iph; 417 struct sk_buff *skb; 418 419 if (!inet->recverr) 420 return; 421 422 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 423 if (!skb) 424 return; 425 426 skb_put(skb, sizeof(struct iphdr)); 427 skb_reset_network_header(skb); 428 iph = ip_hdr(skb); 429 iph->daddr = daddr; 430 431 serr = SKB_EXT_ERR(skb); 432 serr->ee.ee_errno = err; 433 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 434 serr->ee.ee_type = 0; 435 serr->ee.ee_code = 0; 436 serr->ee.ee_pad = 0; 437 serr->ee.ee_info = info; 438 serr->ee.ee_data = 0; 439 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 440 serr->port = port; 441 442 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 443 skb_reset_transport_header(skb); 444 445 if (sock_queue_err_skb(sk, skb)) 446 kfree_skb(skb); 447 } 448 449 /* For some errors we have valid addr_offset even with zero payload and 450 * zero port. Also, addr_offset should be supported if port is set. 451 */ 452 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 453 { 454 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 455 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 456 } 457 458 /* IPv4 supports cmsg on all imcp errors and some timestamps 459 * 460 * Timestamp code paths do not initialize the fields expected by cmsg: 461 * the PKTINFO fields in skb->cb[]. Fill those in here. 462 */ 463 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 464 struct sk_buff *skb, 465 int ee_origin) 466 { 467 struct in_pktinfo *info; 468 469 if (ee_origin == SO_EE_ORIGIN_ICMP) 470 return true; 471 472 if (ee_origin == SO_EE_ORIGIN_LOCAL) 473 return false; 474 475 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 476 * timestamp with egress dev. Not possible for packets without dev 477 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 478 */ 479 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 480 (!skb->dev)) 481 return false; 482 483 info = PKTINFO_SKB_CB(skb); 484 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 485 info->ipi_ifindex = skb->dev->ifindex; 486 return true; 487 } 488 489 /* 490 * Handle MSG_ERRQUEUE 491 */ 492 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 493 { 494 struct sock_exterr_skb *serr; 495 struct sk_buff *skb; 496 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 497 struct { 498 struct sock_extended_err ee; 499 struct sockaddr_in offender; 500 } errhdr; 501 int err; 502 int copied; 503 504 WARN_ON_ONCE(sk->sk_family == AF_INET6); 505 506 err = -EAGAIN; 507 skb = sock_dequeue_err_skb(sk); 508 if (!skb) 509 goto out; 510 511 copied = skb->len; 512 if (copied > len) { 513 msg->msg_flags |= MSG_TRUNC; 514 copied = len; 515 } 516 err = skb_copy_datagram_msg(skb, 0, msg, copied); 517 if (unlikely(err)) { 518 kfree_skb(skb); 519 return err; 520 } 521 sock_recv_timestamp(msg, sk, skb); 522 523 serr = SKB_EXT_ERR(skb); 524 525 if (sin && ipv4_datagram_support_addr(serr)) { 526 sin->sin_family = AF_INET; 527 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 528 serr->addr_offset); 529 sin->sin_port = serr->port; 530 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 531 *addr_len = sizeof(*sin); 532 } 533 534 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 535 sin = &errhdr.offender; 536 memset(sin, 0, sizeof(*sin)); 537 538 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 539 sin->sin_family = AF_INET; 540 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 541 if (inet_sk(sk)->cmsg_flags) 542 ip_cmsg_recv(msg, skb); 543 } 544 545 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 546 547 /* Now we could try to dump offended packet options */ 548 549 msg->msg_flags |= MSG_ERRQUEUE; 550 err = copied; 551 552 consume_skb(skb); 553 out: 554 return err; 555 } 556 557 558 /* 559 * Socket option code for IP. This is the end of the line after any 560 * TCP,UDP etc options on an IP socket. 561 */ 562 static bool setsockopt_needs_rtnl(int optname) 563 { 564 switch (optname) { 565 case IP_ADD_MEMBERSHIP: 566 case IP_ADD_SOURCE_MEMBERSHIP: 567 case IP_BLOCK_SOURCE: 568 case IP_DROP_MEMBERSHIP: 569 case IP_DROP_SOURCE_MEMBERSHIP: 570 case IP_MSFILTER: 571 case IP_UNBLOCK_SOURCE: 572 case MCAST_BLOCK_SOURCE: 573 case MCAST_MSFILTER: 574 case MCAST_JOIN_GROUP: 575 case MCAST_JOIN_SOURCE_GROUP: 576 case MCAST_LEAVE_GROUP: 577 case MCAST_LEAVE_SOURCE_GROUP: 578 case MCAST_UNBLOCK_SOURCE: 579 return true; 580 } 581 return false; 582 } 583 584 static int do_ip_setsockopt(struct sock *sk, int level, 585 int optname, char __user *optval, unsigned int optlen) 586 { 587 struct inet_sock *inet = inet_sk(sk); 588 struct net *net = sock_net(sk); 589 int val = 0, err; 590 bool needs_rtnl = setsockopt_needs_rtnl(optname); 591 592 switch (optname) { 593 case IP_PKTINFO: 594 case IP_RECVTTL: 595 case IP_RECVOPTS: 596 case IP_RECVTOS: 597 case IP_RETOPTS: 598 case IP_TOS: 599 case IP_TTL: 600 case IP_HDRINCL: 601 case IP_MTU_DISCOVER: 602 case IP_RECVERR: 603 case IP_ROUTER_ALERT: 604 case IP_FREEBIND: 605 case IP_PASSSEC: 606 case IP_TRANSPARENT: 607 case IP_MINTTL: 608 case IP_NODEFRAG: 609 case IP_BIND_ADDRESS_NO_PORT: 610 case IP_UNICAST_IF: 611 case IP_MULTICAST_TTL: 612 case IP_MULTICAST_ALL: 613 case IP_MULTICAST_LOOP: 614 case IP_RECVORIGDSTADDR: 615 case IP_CHECKSUM: 616 if (optlen >= sizeof(int)) { 617 if (get_user(val, (int __user *) optval)) 618 return -EFAULT; 619 } else if (optlen >= sizeof(char)) { 620 unsigned char ucval; 621 622 if (get_user(ucval, (unsigned char __user *) optval)) 623 return -EFAULT; 624 val = (int) ucval; 625 } 626 } 627 628 /* If optlen==0, it is equivalent to val == 0 */ 629 630 if (ip_mroute_opt(optname)) 631 return ip_mroute_setsockopt(sk, optname, optval, optlen); 632 633 err = 0; 634 if (needs_rtnl) 635 rtnl_lock(); 636 lock_sock(sk); 637 638 switch (optname) { 639 case IP_OPTIONS: 640 { 641 struct ip_options_rcu *old, *opt = NULL; 642 643 if (optlen > 40) 644 goto e_inval; 645 err = ip_options_get_from_user(sock_net(sk), &opt, 646 optval, optlen); 647 if (err) 648 break; 649 old = rcu_dereference_protected(inet->inet_opt, 650 lockdep_sock_is_held(sk)); 651 if (inet->is_icsk) { 652 struct inet_connection_sock *icsk = inet_csk(sk); 653 #if IS_ENABLED(CONFIG_IPV6) 654 if (sk->sk_family == PF_INET || 655 (!((1 << sk->sk_state) & 656 (TCPF_LISTEN | TCPF_CLOSE)) && 657 inet->inet_daddr != LOOPBACK4_IPV6)) { 658 #endif 659 if (old) 660 icsk->icsk_ext_hdr_len -= old->opt.optlen; 661 if (opt) 662 icsk->icsk_ext_hdr_len += opt->opt.optlen; 663 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 664 #if IS_ENABLED(CONFIG_IPV6) 665 } 666 #endif 667 } 668 rcu_assign_pointer(inet->inet_opt, opt); 669 if (old) 670 kfree_rcu(old, rcu); 671 break; 672 } 673 case IP_PKTINFO: 674 if (val) 675 inet->cmsg_flags |= IP_CMSG_PKTINFO; 676 else 677 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 678 break; 679 case IP_RECVTTL: 680 if (val) 681 inet->cmsg_flags |= IP_CMSG_TTL; 682 else 683 inet->cmsg_flags &= ~IP_CMSG_TTL; 684 break; 685 case IP_RECVTOS: 686 if (val) 687 inet->cmsg_flags |= IP_CMSG_TOS; 688 else 689 inet->cmsg_flags &= ~IP_CMSG_TOS; 690 break; 691 case IP_RECVOPTS: 692 if (val) 693 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 694 else 695 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 696 break; 697 case IP_RETOPTS: 698 if (val) 699 inet->cmsg_flags |= IP_CMSG_RETOPTS; 700 else 701 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 702 break; 703 case IP_PASSSEC: 704 if (val) 705 inet->cmsg_flags |= IP_CMSG_PASSSEC; 706 else 707 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 708 break; 709 case IP_RECVORIGDSTADDR: 710 if (val) 711 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 712 else 713 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 714 break; 715 case IP_CHECKSUM: 716 if (val) { 717 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 718 inet_inc_convert_csum(sk); 719 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 720 } 721 } else { 722 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 723 inet_dec_convert_csum(sk); 724 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 725 } 726 } 727 break; 728 case IP_TOS: /* This sets both TOS and Precedence */ 729 if (sk->sk_type == SOCK_STREAM) { 730 val &= ~INET_ECN_MASK; 731 val |= inet->tos & INET_ECN_MASK; 732 } 733 if (inet->tos != val) { 734 inet->tos = val; 735 sk->sk_priority = rt_tos2priority(val); 736 sk_dst_reset(sk); 737 } 738 break; 739 case IP_TTL: 740 if (optlen < 1) 741 goto e_inval; 742 if (val != -1 && (val < 1 || val > 255)) 743 goto e_inval; 744 inet->uc_ttl = val; 745 break; 746 case IP_HDRINCL: 747 if (sk->sk_type != SOCK_RAW) { 748 err = -ENOPROTOOPT; 749 break; 750 } 751 inet->hdrincl = val ? 1 : 0; 752 break; 753 case IP_NODEFRAG: 754 if (sk->sk_type != SOCK_RAW) { 755 err = -ENOPROTOOPT; 756 break; 757 } 758 inet->nodefrag = val ? 1 : 0; 759 break; 760 case IP_BIND_ADDRESS_NO_PORT: 761 inet->bind_address_no_port = val ? 1 : 0; 762 break; 763 case IP_MTU_DISCOVER: 764 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 765 goto e_inval; 766 inet->pmtudisc = val; 767 break; 768 case IP_RECVERR: 769 inet->recverr = !!val; 770 if (!val) 771 skb_queue_purge(&sk->sk_error_queue); 772 break; 773 case IP_MULTICAST_TTL: 774 if (sk->sk_type == SOCK_STREAM) 775 goto e_inval; 776 if (optlen < 1) 777 goto e_inval; 778 if (val == -1) 779 val = 1; 780 if (val < 0 || val > 255) 781 goto e_inval; 782 inet->mc_ttl = val; 783 break; 784 case IP_MULTICAST_LOOP: 785 if (optlen < 1) 786 goto e_inval; 787 inet->mc_loop = !!val; 788 break; 789 case IP_UNICAST_IF: 790 { 791 struct net_device *dev = NULL; 792 int ifindex; 793 794 if (optlen != sizeof(int)) 795 goto e_inval; 796 797 ifindex = (__force int)ntohl((__force __be32)val); 798 if (ifindex == 0) { 799 inet->uc_index = 0; 800 err = 0; 801 break; 802 } 803 804 dev = dev_get_by_index(sock_net(sk), ifindex); 805 err = -EADDRNOTAVAIL; 806 if (!dev) 807 break; 808 dev_put(dev); 809 810 err = -EINVAL; 811 if (sk->sk_bound_dev_if) 812 break; 813 814 inet->uc_index = ifindex; 815 err = 0; 816 break; 817 } 818 case IP_MULTICAST_IF: 819 { 820 struct ip_mreqn mreq; 821 struct net_device *dev = NULL; 822 823 if (sk->sk_type == SOCK_STREAM) 824 goto e_inval; 825 /* 826 * Check the arguments are allowable 827 */ 828 829 if (optlen < sizeof(struct in_addr)) 830 goto e_inval; 831 832 err = -EFAULT; 833 if (optlen >= sizeof(struct ip_mreqn)) { 834 if (copy_from_user(&mreq, optval, sizeof(mreq))) 835 break; 836 } else { 837 memset(&mreq, 0, sizeof(mreq)); 838 if (optlen >= sizeof(struct ip_mreq)) { 839 if (copy_from_user(&mreq, optval, 840 sizeof(struct ip_mreq))) 841 break; 842 } else if (optlen >= sizeof(struct in_addr)) { 843 if (copy_from_user(&mreq.imr_address, optval, 844 sizeof(struct in_addr))) 845 break; 846 } 847 } 848 849 if (!mreq.imr_ifindex) { 850 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 851 inet->mc_index = 0; 852 inet->mc_addr = 0; 853 err = 0; 854 break; 855 } 856 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 857 if (dev) 858 mreq.imr_ifindex = dev->ifindex; 859 } else 860 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 861 862 863 err = -EADDRNOTAVAIL; 864 if (!dev) 865 break; 866 dev_put(dev); 867 868 err = -EINVAL; 869 if (sk->sk_bound_dev_if && 870 mreq.imr_ifindex != sk->sk_bound_dev_if) 871 break; 872 873 inet->mc_index = mreq.imr_ifindex; 874 inet->mc_addr = mreq.imr_address.s_addr; 875 err = 0; 876 break; 877 } 878 879 case IP_ADD_MEMBERSHIP: 880 case IP_DROP_MEMBERSHIP: 881 { 882 struct ip_mreqn mreq; 883 884 err = -EPROTO; 885 if (inet_sk(sk)->is_icsk) 886 break; 887 888 if (optlen < sizeof(struct ip_mreq)) 889 goto e_inval; 890 err = -EFAULT; 891 if (optlen >= sizeof(struct ip_mreqn)) { 892 if (copy_from_user(&mreq, optval, sizeof(mreq))) 893 break; 894 } else { 895 memset(&mreq, 0, sizeof(mreq)); 896 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 897 break; 898 } 899 900 if (optname == IP_ADD_MEMBERSHIP) 901 err = ip_mc_join_group(sk, &mreq); 902 else 903 err = ip_mc_leave_group(sk, &mreq); 904 break; 905 } 906 case IP_MSFILTER: 907 { 908 struct ip_msfilter *msf; 909 910 if (optlen < IP_MSFILTER_SIZE(0)) 911 goto e_inval; 912 if (optlen > sysctl_optmem_max) { 913 err = -ENOBUFS; 914 break; 915 } 916 msf = kmalloc(optlen, GFP_KERNEL); 917 if (!msf) { 918 err = -ENOBUFS; 919 break; 920 } 921 err = -EFAULT; 922 if (copy_from_user(msf, optval, optlen)) { 923 kfree(msf); 924 break; 925 } 926 /* numsrc >= (1G-4) overflow in 32 bits */ 927 if (msf->imsf_numsrc >= 0x3ffffffcU || 928 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 929 kfree(msf); 930 err = -ENOBUFS; 931 break; 932 } 933 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 934 kfree(msf); 935 err = -EINVAL; 936 break; 937 } 938 err = ip_mc_msfilter(sk, msf, 0); 939 kfree(msf); 940 break; 941 } 942 case IP_BLOCK_SOURCE: 943 case IP_UNBLOCK_SOURCE: 944 case IP_ADD_SOURCE_MEMBERSHIP: 945 case IP_DROP_SOURCE_MEMBERSHIP: 946 { 947 struct ip_mreq_source mreqs; 948 int omode, add; 949 950 if (optlen != sizeof(struct ip_mreq_source)) 951 goto e_inval; 952 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 953 err = -EFAULT; 954 break; 955 } 956 if (optname == IP_BLOCK_SOURCE) { 957 omode = MCAST_EXCLUDE; 958 add = 1; 959 } else if (optname == IP_UNBLOCK_SOURCE) { 960 omode = MCAST_EXCLUDE; 961 add = 0; 962 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 963 struct ip_mreqn mreq; 964 965 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 966 mreq.imr_address.s_addr = mreqs.imr_interface; 967 mreq.imr_ifindex = 0; 968 err = ip_mc_join_group(sk, &mreq); 969 if (err && err != -EADDRINUSE) 970 break; 971 omode = MCAST_INCLUDE; 972 add = 1; 973 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 974 omode = MCAST_INCLUDE; 975 add = 0; 976 } 977 err = ip_mc_source(add, omode, sk, &mreqs, 0); 978 break; 979 } 980 case MCAST_JOIN_GROUP: 981 case MCAST_LEAVE_GROUP: 982 { 983 struct group_req greq; 984 struct sockaddr_in *psin; 985 struct ip_mreqn mreq; 986 987 if (optlen < sizeof(struct group_req)) 988 goto e_inval; 989 err = -EFAULT; 990 if (copy_from_user(&greq, optval, sizeof(greq))) 991 break; 992 psin = (struct sockaddr_in *)&greq.gr_group; 993 if (psin->sin_family != AF_INET) 994 goto e_inval; 995 memset(&mreq, 0, sizeof(mreq)); 996 mreq.imr_multiaddr = psin->sin_addr; 997 mreq.imr_ifindex = greq.gr_interface; 998 999 if (optname == MCAST_JOIN_GROUP) 1000 err = ip_mc_join_group(sk, &mreq); 1001 else 1002 err = ip_mc_leave_group(sk, &mreq); 1003 break; 1004 } 1005 case MCAST_JOIN_SOURCE_GROUP: 1006 case MCAST_LEAVE_SOURCE_GROUP: 1007 case MCAST_BLOCK_SOURCE: 1008 case MCAST_UNBLOCK_SOURCE: 1009 { 1010 struct group_source_req greqs; 1011 struct ip_mreq_source mreqs; 1012 struct sockaddr_in *psin; 1013 int omode, add; 1014 1015 if (optlen != sizeof(struct group_source_req)) 1016 goto e_inval; 1017 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1018 err = -EFAULT; 1019 break; 1020 } 1021 if (greqs.gsr_group.ss_family != AF_INET || 1022 greqs.gsr_source.ss_family != AF_INET) { 1023 err = -EADDRNOTAVAIL; 1024 break; 1025 } 1026 psin = (struct sockaddr_in *)&greqs.gsr_group; 1027 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1028 psin = (struct sockaddr_in *)&greqs.gsr_source; 1029 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1030 mreqs.imr_interface = 0; /* use index for mc_source */ 1031 1032 if (optname == MCAST_BLOCK_SOURCE) { 1033 omode = MCAST_EXCLUDE; 1034 add = 1; 1035 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1036 omode = MCAST_EXCLUDE; 1037 add = 0; 1038 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1039 struct ip_mreqn mreq; 1040 1041 psin = (struct sockaddr_in *)&greqs.gsr_group; 1042 mreq.imr_multiaddr = psin->sin_addr; 1043 mreq.imr_address.s_addr = 0; 1044 mreq.imr_ifindex = greqs.gsr_interface; 1045 err = ip_mc_join_group(sk, &mreq); 1046 if (err && err != -EADDRINUSE) 1047 break; 1048 greqs.gsr_interface = mreq.imr_ifindex; 1049 omode = MCAST_INCLUDE; 1050 add = 1; 1051 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1052 omode = MCAST_INCLUDE; 1053 add = 0; 1054 } 1055 err = ip_mc_source(add, omode, sk, &mreqs, 1056 greqs.gsr_interface); 1057 break; 1058 } 1059 case MCAST_MSFILTER: 1060 { 1061 struct sockaddr_in *psin; 1062 struct ip_msfilter *msf = NULL; 1063 struct group_filter *gsf = NULL; 1064 int msize, i, ifindex; 1065 1066 if (optlen < GROUP_FILTER_SIZE(0)) 1067 goto e_inval; 1068 if (optlen > sysctl_optmem_max) { 1069 err = -ENOBUFS; 1070 break; 1071 } 1072 gsf = kmalloc(optlen, GFP_KERNEL); 1073 if (!gsf) { 1074 err = -ENOBUFS; 1075 break; 1076 } 1077 err = -EFAULT; 1078 if (copy_from_user(gsf, optval, optlen)) 1079 goto mc_msf_out; 1080 1081 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1082 if (gsf->gf_numsrc >= 0x1ffffff || 1083 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1084 err = -ENOBUFS; 1085 goto mc_msf_out; 1086 } 1087 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1088 err = -EINVAL; 1089 goto mc_msf_out; 1090 } 1091 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1092 msf = kmalloc(msize, GFP_KERNEL); 1093 if (!msf) { 1094 err = -ENOBUFS; 1095 goto mc_msf_out; 1096 } 1097 ifindex = gsf->gf_interface; 1098 psin = (struct sockaddr_in *)&gsf->gf_group; 1099 if (psin->sin_family != AF_INET) { 1100 err = -EADDRNOTAVAIL; 1101 goto mc_msf_out; 1102 } 1103 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1104 msf->imsf_interface = 0; 1105 msf->imsf_fmode = gsf->gf_fmode; 1106 msf->imsf_numsrc = gsf->gf_numsrc; 1107 err = -EADDRNOTAVAIL; 1108 for (i = 0; i < gsf->gf_numsrc; ++i) { 1109 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1110 1111 if (psin->sin_family != AF_INET) 1112 goto mc_msf_out; 1113 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1114 } 1115 kfree(gsf); 1116 gsf = NULL; 1117 1118 err = ip_mc_msfilter(sk, msf, ifindex); 1119 mc_msf_out: 1120 kfree(msf); 1121 kfree(gsf); 1122 break; 1123 } 1124 case IP_MULTICAST_ALL: 1125 if (optlen < 1) 1126 goto e_inval; 1127 if (val != 0 && val != 1) 1128 goto e_inval; 1129 inet->mc_all = val; 1130 break; 1131 case IP_ROUTER_ALERT: 1132 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1133 break; 1134 1135 case IP_FREEBIND: 1136 if (optlen < 1) 1137 goto e_inval; 1138 inet->freebind = !!val; 1139 break; 1140 1141 case IP_IPSEC_POLICY: 1142 case IP_XFRM_POLICY: 1143 err = -EPERM; 1144 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1145 break; 1146 err = xfrm_user_policy(sk, optname, optval, optlen); 1147 break; 1148 1149 case IP_TRANSPARENT: 1150 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1151 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1152 err = -EPERM; 1153 break; 1154 } 1155 if (optlen < 1) 1156 goto e_inval; 1157 inet->transparent = !!val; 1158 break; 1159 1160 case IP_MINTTL: 1161 if (optlen < 1) 1162 goto e_inval; 1163 if (val < 0 || val > 255) 1164 goto e_inval; 1165 inet->min_ttl = val; 1166 break; 1167 1168 default: 1169 err = -ENOPROTOOPT; 1170 break; 1171 } 1172 release_sock(sk); 1173 if (needs_rtnl) 1174 rtnl_unlock(); 1175 return err; 1176 1177 e_inval: 1178 release_sock(sk); 1179 if (needs_rtnl) 1180 rtnl_unlock(); 1181 return -EINVAL; 1182 } 1183 1184 /** 1185 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1186 * @sk: socket 1187 * @skb: buffer 1188 * 1189 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1190 * destination in skb->cb[] before dst drop. 1191 * This way, receiver doesn't make cache line misses to read rtable. 1192 */ 1193 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1194 { 1195 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1196 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1197 ipv6_sk_rxinfo(sk); 1198 1199 if (prepare && skb_rtable(skb)) { 1200 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1201 * which has interface index (iif) as the first member of the 1202 * underlying inet{6}_skb_parm struct. This code then overlays 1203 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1204 * element so the iif is picked up from the prior IPCB 1205 */ 1206 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1207 } else { 1208 pktinfo->ipi_ifindex = 0; 1209 pktinfo->ipi_spec_dst.s_addr = 0; 1210 } 1211 skb_dst_drop(skb); 1212 } 1213 1214 int ip_setsockopt(struct sock *sk, int level, 1215 int optname, char __user *optval, unsigned int optlen) 1216 { 1217 int err; 1218 1219 if (level != SOL_IP) 1220 return -ENOPROTOOPT; 1221 1222 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1223 #ifdef CONFIG_NETFILTER 1224 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1225 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1226 optname != IP_IPSEC_POLICY && 1227 optname != IP_XFRM_POLICY && 1228 !ip_mroute_opt(optname)) { 1229 lock_sock(sk); 1230 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1231 release_sock(sk); 1232 } 1233 #endif 1234 return err; 1235 } 1236 EXPORT_SYMBOL(ip_setsockopt); 1237 1238 #ifdef CONFIG_COMPAT 1239 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1240 char __user *optval, unsigned int optlen) 1241 { 1242 int err; 1243 1244 if (level != SOL_IP) 1245 return -ENOPROTOOPT; 1246 1247 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1248 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1249 ip_setsockopt); 1250 1251 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1252 #ifdef CONFIG_NETFILTER 1253 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1254 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1255 optname != IP_IPSEC_POLICY && 1256 optname != IP_XFRM_POLICY && 1257 !ip_mroute_opt(optname)) { 1258 lock_sock(sk); 1259 err = compat_nf_setsockopt(sk, PF_INET, optname, 1260 optval, optlen); 1261 release_sock(sk); 1262 } 1263 #endif 1264 return err; 1265 } 1266 EXPORT_SYMBOL(compat_ip_setsockopt); 1267 #endif 1268 1269 /* 1270 * Get the options. Note for future reference. The GET of IP options gets 1271 * the _received_ ones. The set sets the _sent_ ones. 1272 */ 1273 1274 static bool getsockopt_needs_rtnl(int optname) 1275 { 1276 switch (optname) { 1277 case IP_MSFILTER: 1278 case MCAST_MSFILTER: 1279 return true; 1280 } 1281 return false; 1282 } 1283 1284 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1285 char __user *optval, int __user *optlen, unsigned int flags) 1286 { 1287 struct inet_sock *inet = inet_sk(sk); 1288 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1289 int val, err = 0; 1290 int len; 1291 1292 if (level != SOL_IP) 1293 return -EOPNOTSUPP; 1294 1295 if (ip_mroute_opt(optname)) 1296 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1297 1298 if (get_user(len, optlen)) 1299 return -EFAULT; 1300 if (len < 0) 1301 return -EINVAL; 1302 1303 if (needs_rtnl) 1304 rtnl_lock(); 1305 lock_sock(sk); 1306 1307 switch (optname) { 1308 case IP_OPTIONS: 1309 { 1310 unsigned char optbuf[sizeof(struct ip_options)+40]; 1311 struct ip_options *opt = (struct ip_options *)optbuf; 1312 struct ip_options_rcu *inet_opt; 1313 1314 inet_opt = rcu_dereference_protected(inet->inet_opt, 1315 lockdep_sock_is_held(sk)); 1316 opt->optlen = 0; 1317 if (inet_opt) 1318 memcpy(optbuf, &inet_opt->opt, 1319 sizeof(struct ip_options) + 1320 inet_opt->opt.optlen); 1321 release_sock(sk); 1322 1323 if (opt->optlen == 0) 1324 return put_user(0, optlen); 1325 1326 ip_options_undo(opt); 1327 1328 len = min_t(unsigned int, len, opt->optlen); 1329 if (put_user(len, optlen)) 1330 return -EFAULT; 1331 if (copy_to_user(optval, opt->__data, len)) 1332 return -EFAULT; 1333 return 0; 1334 } 1335 case IP_PKTINFO: 1336 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1337 break; 1338 case IP_RECVTTL: 1339 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1340 break; 1341 case IP_RECVTOS: 1342 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1343 break; 1344 case IP_RECVOPTS: 1345 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1346 break; 1347 case IP_RETOPTS: 1348 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1349 break; 1350 case IP_PASSSEC: 1351 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1352 break; 1353 case IP_RECVORIGDSTADDR: 1354 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1355 break; 1356 case IP_CHECKSUM: 1357 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1358 break; 1359 case IP_TOS: 1360 val = inet->tos; 1361 break; 1362 case IP_TTL: 1363 { 1364 struct net *net = sock_net(sk); 1365 val = (inet->uc_ttl == -1 ? 1366 net->ipv4.sysctl_ip_default_ttl : 1367 inet->uc_ttl); 1368 break; 1369 } 1370 case IP_HDRINCL: 1371 val = inet->hdrincl; 1372 break; 1373 case IP_NODEFRAG: 1374 val = inet->nodefrag; 1375 break; 1376 case IP_BIND_ADDRESS_NO_PORT: 1377 val = inet->bind_address_no_port; 1378 break; 1379 case IP_MTU_DISCOVER: 1380 val = inet->pmtudisc; 1381 break; 1382 case IP_MTU: 1383 { 1384 struct dst_entry *dst; 1385 val = 0; 1386 dst = sk_dst_get(sk); 1387 if (dst) { 1388 val = dst_mtu(dst); 1389 dst_release(dst); 1390 } 1391 if (!val) { 1392 release_sock(sk); 1393 return -ENOTCONN; 1394 } 1395 break; 1396 } 1397 case IP_RECVERR: 1398 val = inet->recverr; 1399 break; 1400 case IP_MULTICAST_TTL: 1401 val = inet->mc_ttl; 1402 break; 1403 case IP_MULTICAST_LOOP: 1404 val = inet->mc_loop; 1405 break; 1406 case IP_UNICAST_IF: 1407 val = (__force int)htonl((__u32) inet->uc_index); 1408 break; 1409 case IP_MULTICAST_IF: 1410 { 1411 struct in_addr addr; 1412 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1413 addr.s_addr = inet->mc_addr; 1414 release_sock(sk); 1415 1416 if (put_user(len, optlen)) 1417 return -EFAULT; 1418 if (copy_to_user(optval, &addr, len)) 1419 return -EFAULT; 1420 return 0; 1421 } 1422 case IP_MSFILTER: 1423 { 1424 struct ip_msfilter msf; 1425 1426 if (len < IP_MSFILTER_SIZE(0)) { 1427 err = -EINVAL; 1428 goto out; 1429 } 1430 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1431 err = -EFAULT; 1432 goto out; 1433 } 1434 err = ip_mc_msfget(sk, &msf, 1435 (struct ip_msfilter __user *)optval, optlen); 1436 goto out; 1437 } 1438 case MCAST_MSFILTER: 1439 { 1440 struct group_filter gsf; 1441 1442 if (len < GROUP_FILTER_SIZE(0)) { 1443 err = -EINVAL; 1444 goto out; 1445 } 1446 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1447 err = -EFAULT; 1448 goto out; 1449 } 1450 err = ip_mc_gsfget(sk, &gsf, 1451 (struct group_filter __user *)optval, 1452 optlen); 1453 goto out; 1454 } 1455 case IP_MULTICAST_ALL: 1456 val = inet->mc_all; 1457 break; 1458 case IP_PKTOPTIONS: 1459 { 1460 struct msghdr msg; 1461 1462 release_sock(sk); 1463 1464 if (sk->sk_type != SOCK_STREAM) 1465 return -ENOPROTOOPT; 1466 1467 msg.msg_control = (__force void *) optval; 1468 msg.msg_controllen = len; 1469 msg.msg_flags = flags; 1470 1471 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1472 struct in_pktinfo info; 1473 1474 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1475 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1476 info.ipi_ifindex = inet->mc_index; 1477 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1478 } 1479 if (inet->cmsg_flags & IP_CMSG_TTL) { 1480 int hlim = inet->mc_ttl; 1481 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1482 } 1483 if (inet->cmsg_flags & IP_CMSG_TOS) { 1484 int tos = inet->rcv_tos; 1485 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1486 } 1487 len -= msg.msg_controllen; 1488 return put_user(len, optlen); 1489 } 1490 case IP_FREEBIND: 1491 val = inet->freebind; 1492 break; 1493 case IP_TRANSPARENT: 1494 val = inet->transparent; 1495 break; 1496 case IP_MINTTL: 1497 val = inet->min_ttl; 1498 break; 1499 default: 1500 release_sock(sk); 1501 return -ENOPROTOOPT; 1502 } 1503 release_sock(sk); 1504 1505 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1506 unsigned char ucval = (unsigned char)val; 1507 len = 1; 1508 if (put_user(len, optlen)) 1509 return -EFAULT; 1510 if (copy_to_user(optval, &ucval, 1)) 1511 return -EFAULT; 1512 } else { 1513 len = min_t(unsigned int, sizeof(int), len); 1514 if (put_user(len, optlen)) 1515 return -EFAULT; 1516 if (copy_to_user(optval, &val, len)) 1517 return -EFAULT; 1518 } 1519 return 0; 1520 1521 out: 1522 release_sock(sk); 1523 if (needs_rtnl) 1524 rtnl_unlock(); 1525 return err; 1526 } 1527 1528 int ip_getsockopt(struct sock *sk, int level, 1529 int optname, char __user *optval, int __user *optlen) 1530 { 1531 int err; 1532 1533 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1534 #ifdef CONFIG_NETFILTER 1535 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1536 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1537 !ip_mroute_opt(optname)) { 1538 int len; 1539 1540 if (get_user(len, optlen)) 1541 return -EFAULT; 1542 1543 lock_sock(sk); 1544 err = nf_getsockopt(sk, PF_INET, optname, optval, 1545 &len); 1546 release_sock(sk); 1547 if (err >= 0) 1548 err = put_user(len, optlen); 1549 return err; 1550 } 1551 #endif 1552 return err; 1553 } 1554 EXPORT_SYMBOL(ip_getsockopt); 1555 1556 #ifdef CONFIG_COMPAT 1557 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1558 char __user *optval, int __user *optlen) 1559 { 1560 int err; 1561 1562 if (optname == MCAST_MSFILTER) 1563 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1564 ip_getsockopt); 1565 1566 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1567 MSG_CMSG_COMPAT); 1568 1569 #ifdef CONFIG_NETFILTER 1570 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1571 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1572 !ip_mroute_opt(optname)) { 1573 int len; 1574 1575 if (get_user(len, optlen)) 1576 return -EFAULT; 1577 1578 lock_sock(sk); 1579 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1580 release_sock(sk); 1581 if (err >= 0) 1582 err = put_user(len, optlen); 1583 return err; 1584 } 1585 #endif 1586 return err; 1587 } 1588 EXPORT_SYMBOL(compat_ip_getsockopt); 1589 #endif 1590