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 <linux/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_fragsize(struct msghdr *msg, struct sk_buff *skb) 101 { 102 int val; 103 104 if (IPCB(skb)->frag_max_size == 0) 105 return; 106 107 val = IPCB(skb)->frag_max_size; 108 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 109 } 110 111 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 112 int tlen, int offset) 113 { 114 __wsum csum = skb->csum; 115 116 if (skb->ip_summed != CHECKSUM_COMPLETE) 117 return; 118 119 if (offset != 0) { 120 int tend_off = skb_transport_offset(skb) + tlen; 121 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 122 } 123 124 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 125 } 126 127 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 128 { 129 char *secdata; 130 u32 seclen, secid; 131 int err; 132 133 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 134 if (err) 135 return; 136 137 err = security_secid_to_secctx(secid, &secdata, &seclen); 138 if (err) 139 return; 140 141 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 142 security_release_secctx(secdata, seclen); 143 } 144 145 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 146 { 147 struct sockaddr_in sin; 148 const struct iphdr *iph = ip_hdr(skb); 149 __be16 *ports = (__be16 *)skb_transport_header(skb); 150 151 if (skb_transport_offset(skb) + 4 > (int)skb->len) 152 return; 153 154 /* All current transport protocols have the port numbers in the 155 * first four bytes of the transport header and this function is 156 * written with this assumption in mind. 157 */ 158 159 sin.sin_family = AF_INET; 160 sin.sin_addr.s_addr = iph->daddr; 161 sin.sin_port = ports[1]; 162 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 163 164 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 165 } 166 167 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 168 struct sk_buff *skb, int tlen, int offset) 169 { 170 struct inet_sock *inet = inet_sk(sk); 171 unsigned int flags = inet->cmsg_flags; 172 173 /* Ordered by supposed usage frequency */ 174 if (flags & IP_CMSG_PKTINFO) { 175 ip_cmsg_recv_pktinfo(msg, skb); 176 177 flags &= ~IP_CMSG_PKTINFO; 178 if (!flags) 179 return; 180 } 181 182 if (flags & IP_CMSG_TTL) { 183 ip_cmsg_recv_ttl(msg, skb); 184 185 flags &= ~IP_CMSG_TTL; 186 if (!flags) 187 return; 188 } 189 190 if (flags & IP_CMSG_TOS) { 191 ip_cmsg_recv_tos(msg, skb); 192 193 flags &= ~IP_CMSG_TOS; 194 if (!flags) 195 return; 196 } 197 198 if (flags & IP_CMSG_RECVOPTS) { 199 ip_cmsg_recv_opts(msg, skb); 200 201 flags &= ~IP_CMSG_RECVOPTS; 202 if (!flags) 203 return; 204 } 205 206 if (flags & IP_CMSG_RETOPTS) { 207 ip_cmsg_recv_retopts(msg, skb); 208 209 flags &= ~IP_CMSG_RETOPTS; 210 if (!flags) 211 return; 212 } 213 214 if (flags & IP_CMSG_PASSSEC) { 215 ip_cmsg_recv_security(msg, skb); 216 217 flags &= ~IP_CMSG_PASSSEC; 218 if (!flags) 219 return; 220 } 221 222 if (flags & IP_CMSG_ORIGDSTADDR) { 223 ip_cmsg_recv_dstaddr(msg, skb); 224 225 flags &= ~IP_CMSG_ORIGDSTADDR; 226 if (!flags) 227 return; 228 } 229 230 if (flags & IP_CMSG_CHECKSUM) 231 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 232 233 if (flags & IP_CMSG_RECVFRAGSIZE) 234 ip_cmsg_recv_fragsize(msg, skb); 235 } 236 EXPORT_SYMBOL(ip_cmsg_recv_offset); 237 238 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 239 bool allow_ipv6) 240 { 241 int err, val; 242 struct cmsghdr *cmsg; 243 struct net *net = sock_net(sk); 244 245 for_each_cmsghdr(cmsg, msg) { 246 if (!CMSG_OK(msg, cmsg)) 247 return -EINVAL; 248 #if IS_ENABLED(CONFIG_IPV6) 249 if (allow_ipv6 && 250 cmsg->cmsg_level == SOL_IPV6 && 251 cmsg->cmsg_type == IPV6_PKTINFO) { 252 struct in6_pktinfo *src_info; 253 254 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 255 return -EINVAL; 256 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 257 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 258 return -EINVAL; 259 ipc->oif = src_info->ipi6_ifindex; 260 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 261 continue; 262 } 263 #endif 264 if (cmsg->cmsg_level == SOL_SOCKET) { 265 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 266 if (err) 267 return err; 268 continue; 269 } 270 271 if (cmsg->cmsg_level != SOL_IP) 272 continue; 273 switch (cmsg->cmsg_type) { 274 case IP_RETOPTS: 275 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 276 277 /* Our caller is responsible for freeing ipc->opt */ 278 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 279 err < 40 ? err : 40); 280 if (err) 281 return err; 282 break; 283 case IP_PKTINFO: 284 { 285 struct in_pktinfo *info; 286 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 287 return -EINVAL; 288 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 289 ipc->oif = info->ipi_ifindex; 290 ipc->addr = info->ipi_spec_dst.s_addr; 291 break; 292 } 293 case IP_TTL: 294 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 295 return -EINVAL; 296 val = *(int *)CMSG_DATA(cmsg); 297 if (val < 1 || val > 255) 298 return -EINVAL; 299 ipc->ttl = val; 300 break; 301 case IP_TOS: 302 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 303 val = *(int *)CMSG_DATA(cmsg); 304 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 305 val = *(u8 *)CMSG_DATA(cmsg); 306 else 307 return -EINVAL; 308 if (val < 0 || val > 255) 309 return -EINVAL; 310 ipc->tos = val; 311 ipc->priority = rt_tos2priority(ipc->tos); 312 break; 313 314 default: 315 return -EINVAL; 316 } 317 } 318 return 0; 319 } 320 321 322 /* Special input handler for packets caught by router alert option. 323 They are selected only by protocol field, and then processed likely 324 local ones; but only if someone wants them! Otherwise, router 325 not running rsvpd will kill RSVP. 326 327 It is user level problem, what it will make with them. 328 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 329 but receiver should be enough clever f.e. to forward mtrace requests, 330 sent to multicast group to reach destination designated router. 331 */ 332 struct ip_ra_chain __rcu *ip_ra_chain; 333 334 335 static void ip_ra_destroy_rcu(struct rcu_head *head) 336 { 337 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 338 339 sock_put(ra->saved_sk); 340 kfree(ra); 341 } 342 343 int ip_ra_control(struct sock *sk, unsigned char on, 344 void (*destructor)(struct sock *)) 345 { 346 struct ip_ra_chain *ra, *new_ra; 347 struct ip_ra_chain __rcu **rap; 348 349 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 350 return -EINVAL; 351 352 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 353 354 for (rap = &ip_ra_chain; 355 (ra = rtnl_dereference(*rap)) != NULL; 356 rap = &ra->next) { 357 if (ra->sk == sk) { 358 if (on) { 359 kfree(new_ra); 360 return -EADDRINUSE; 361 } 362 /* dont let ip_call_ra_chain() use sk again */ 363 ra->sk = NULL; 364 RCU_INIT_POINTER(*rap, ra->next); 365 366 if (ra->destructor) 367 ra->destructor(sk); 368 /* 369 * Delay sock_put(sk) and kfree(ra) after one rcu grace 370 * period. This guarantee ip_call_ra_chain() dont need 371 * to mess with socket refcounts. 372 */ 373 ra->saved_sk = sk; 374 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 375 return 0; 376 } 377 } 378 if (!new_ra) 379 return -ENOBUFS; 380 new_ra->sk = sk; 381 new_ra->destructor = destructor; 382 383 RCU_INIT_POINTER(new_ra->next, ra); 384 rcu_assign_pointer(*rap, new_ra); 385 sock_hold(sk); 386 387 return 0; 388 } 389 390 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 391 __be16 port, u32 info, u8 *payload) 392 { 393 struct sock_exterr_skb *serr; 394 395 skb = skb_clone(skb, GFP_ATOMIC); 396 if (!skb) 397 return; 398 399 serr = SKB_EXT_ERR(skb); 400 serr->ee.ee_errno = err; 401 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 402 serr->ee.ee_type = icmp_hdr(skb)->type; 403 serr->ee.ee_code = icmp_hdr(skb)->code; 404 serr->ee.ee_pad = 0; 405 serr->ee.ee_info = info; 406 serr->ee.ee_data = 0; 407 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 408 skb_network_header(skb); 409 serr->port = port; 410 411 if (skb_pull(skb, payload - skb->data)) { 412 skb_reset_transport_header(skb); 413 if (sock_queue_err_skb(sk, skb) == 0) 414 return; 415 } 416 kfree_skb(skb); 417 } 418 419 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 420 { 421 struct inet_sock *inet = inet_sk(sk); 422 struct sock_exterr_skb *serr; 423 struct iphdr *iph; 424 struct sk_buff *skb; 425 426 if (!inet->recverr) 427 return; 428 429 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 430 if (!skb) 431 return; 432 433 skb_put(skb, sizeof(struct iphdr)); 434 skb_reset_network_header(skb); 435 iph = ip_hdr(skb); 436 iph->daddr = daddr; 437 438 serr = SKB_EXT_ERR(skb); 439 serr->ee.ee_errno = err; 440 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 441 serr->ee.ee_type = 0; 442 serr->ee.ee_code = 0; 443 serr->ee.ee_pad = 0; 444 serr->ee.ee_info = info; 445 serr->ee.ee_data = 0; 446 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 447 serr->port = port; 448 449 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 450 skb_reset_transport_header(skb); 451 452 if (sock_queue_err_skb(sk, skb)) 453 kfree_skb(skb); 454 } 455 456 /* For some errors we have valid addr_offset even with zero payload and 457 * zero port. Also, addr_offset should be supported if port is set. 458 */ 459 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 460 { 461 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 462 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 463 } 464 465 /* IPv4 supports cmsg on all imcp errors and some timestamps 466 * 467 * Timestamp code paths do not initialize the fields expected by cmsg: 468 * the PKTINFO fields in skb->cb[]. Fill those in here. 469 */ 470 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 471 struct sk_buff *skb, 472 int ee_origin) 473 { 474 struct in_pktinfo *info; 475 476 if (ee_origin == SO_EE_ORIGIN_ICMP) 477 return true; 478 479 if (ee_origin == SO_EE_ORIGIN_LOCAL) 480 return false; 481 482 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 483 * timestamp with egress dev. Not possible for packets without iif 484 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 485 */ 486 info = PKTINFO_SKB_CB(skb); 487 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 488 !info->ipi_ifindex) 489 return false; 490 491 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 492 return true; 493 } 494 495 /* 496 * Handle MSG_ERRQUEUE 497 */ 498 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 499 { 500 struct sock_exterr_skb *serr; 501 struct sk_buff *skb; 502 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 503 struct { 504 struct sock_extended_err ee; 505 struct sockaddr_in offender; 506 } errhdr; 507 int err; 508 int copied; 509 510 WARN_ON_ONCE(sk->sk_family == AF_INET6); 511 512 err = -EAGAIN; 513 skb = sock_dequeue_err_skb(sk); 514 if (!skb) 515 goto out; 516 517 copied = skb->len; 518 if (copied > len) { 519 msg->msg_flags |= MSG_TRUNC; 520 copied = len; 521 } 522 err = skb_copy_datagram_msg(skb, 0, msg, copied); 523 if (unlikely(err)) { 524 kfree_skb(skb); 525 return err; 526 } 527 sock_recv_timestamp(msg, sk, skb); 528 529 serr = SKB_EXT_ERR(skb); 530 531 if (sin && ipv4_datagram_support_addr(serr)) { 532 sin->sin_family = AF_INET; 533 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 534 serr->addr_offset); 535 sin->sin_port = serr->port; 536 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 537 *addr_len = sizeof(*sin); 538 } 539 540 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 541 sin = &errhdr.offender; 542 memset(sin, 0, sizeof(*sin)); 543 544 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 545 sin->sin_family = AF_INET; 546 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 547 if (inet_sk(sk)->cmsg_flags) 548 ip_cmsg_recv(msg, skb); 549 } 550 551 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 552 553 /* Now we could try to dump offended packet options */ 554 555 msg->msg_flags |= MSG_ERRQUEUE; 556 err = copied; 557 558 consume_skb(skb); 559 out: 560 return err; 561 } 562 563 564 /* 565 * Socket option code for IP. This is the end of the line after any 566 * TCP,UDP etc options on an IP socket. 567 */ 568 static bool setsockopt_needs_rtnl(int optname) 569 { 570 switch (optname) { 571 case IP_ADD_MEMBERSHIP: 572 case IP_ADD_SOURCE_MEMBERSHIP: 573 case IP_BLOCK_SOURCE: 574 case IP_DROP_MEMBERSHIP: 575 case IP_DROP_SOURCE_MEMBERSHIP: 576 case IP_MSFILTER: 577 case IP_UNBLOCK_SOURCE: 578 case MCAST_BLOCK_SOURCE: 579 case MCAST_MSFILTER: 580 case MCAST_JOIN_GROUP: 581 case MCAST_JOIN_SOURCE_GROUP: 582 case MCAST_LEAVE_GROUP: 583 case MCAST_LEAVE_SOURCE_GROUP: 584 case MCAST_UNBLOCK_SOURCE: 585 case IP_ROUTER_ALERT: 586 return true; 587 } 588 return false; 589 } 590 591 static int do_ip_setsockopt(struct sock *sk, int level, 592 int optname, char __user *optval, unsigned int optlen) 593 { 594 struct inet_sock *inet = inet_sk(sk); 595 struct net *net = sock_net(sk); 596 int val = 0, err; 597 bool needs_rtnl = setsockopt_needs_rtnl(optname); 598 599 switch (optname) { 600 case IP_PKTINFO: 601 case IP_RECVTTL: 602 case IP_RECVOPTS: 603 case IP_RECVTOS: 604 case IP_RETOPTS: 605 case IP_TOS: 606 case IP_TTL: 607 case IP_HDRINCL: 608 case IP_MTU_DISCOVER: 609 case IP_RECVERR: 610 case IP_ROUTER_ALERT: 611 case IP_FREEBIND: 612 case IP_PASSSEC: 613 case IP_TRANSPARENT: 614 case IP_MINTTL: 615 case IP_NODEFRAG: 616 case IP_BIND_ADDRESS_NO_PORT: 617 case IP_UNICAST_IF: 618 case IP_MULTICAST_TTL: 619 case IP_MULTICAST_ALL: 620 case IP_MULTICAST_LOOP: 621 case IP_RECVORIGDSTADDR: 622 case IP_CHECKSUM: 623 case IP_RECVFRAGSIZE: 624 if (optlen >= sizeof(int)) { 625 if (get_user(val, (int __user *) optval)) 626 return -EFAULT; 627 } else if (optlen >= sizeof(char)) { 628 unsigned char ucval; 629 630 if (get_user(ucval, (unsigned char __user *) optval)) 631 return -EFAULT; 632 val = (int) ucval; 633 } 634 } 635 636 /* If optlen==0, it is equivalent to val == 0 */ 637 638 if (ip_mroute_opt(optname)) 639 return ip_mroute_setsockopt(sk, optname, optval, optlen); 640 641 err = 0; 642 if (needs_rtnl) 643 rtnl_lock(); 644 lock_sock(sk); 645 646 switch (optname) { 647 case IP_OPTIONS: 648 { 649 struct ip_options_rcu *old, *opt = NULL; 650 651 if (optlen > 40) 652 goto e_inval; 653 err = ip_options_get_from_user(sock_net(sk), &opt, 654 optval, optlen); 655 if (err) 656 break; 657 old = rcu_dereference_protected(inet->inet_opt, 658 lockdep_sock_is_held(sk)); 659 if (inet->is_icsk) { 660 struct inet_connection_sock *icsk = inet_csk(sk); 661 #if IS_ENABLED(CONFIG_IPV6) 662 if (sk->sk_family == PF_INET || 663 (!((1 << sk->sk_state) & 664 (TCPF_LISTEN | TCPF_CLOSE)) && 665 inet->inet_daddr != LOOPBACK4_IPV6)) { 666 #endif 667 if (old) 668 icsk->icsk_ext_hdr_len -= old->opt.optlen; 669 if (opt) 670 icsk->icsk_ext_hdr_len += opt->opt.optlen; 671 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 672 #if IS_ENABLED(CONFIG_IPV6) 673 } 674 #endif 675 } 676 rcu_assign_pointer(inet->inet_opt, opt); 677 if (old) 678 kfree_rcu(old, rcu); 679 break; 680 } 681 case IP_PKTINFO: 682 if (val) 683 inet->cmsg_flags |= IP_CMSG_PKTINFO; 684 else 685 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 686 break; 687 case IP_RECVTTL: 688 if (val) 689 inet->cmsg_flags |= IP_CMSG_TTL; 690 else 691 inet->cmsg_flags &= ~IP_CMSG_TTL; 692 break; 693 case IP_RECVTOS: 694 if (val) 695 inet->cmsg_flags |= IP_CMSG_TOS; 696 else 697 inet->cmsg_flags &= ~IP_CMSG_TOS; 698 break; 699 case IP_RECVOPTS: 700 if (val) 701 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 702 else 703 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 704 break; 705 case IP_RETOPTS: 706 if (val) 707 inet->cmsg_flags |= IP_CMSG_RETOPTS; 708 else 709 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 710 break; 711 case IP_PASSSEC: 712 if (val) 713 inet->cmsg_flags |= IP_CMSG_PASSSEC; 714 else 715 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 716 break; 717 case IP_RECVORIGDSTADDR: 718 if (val) 719 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 720 else 721 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 722 break; 723 case IP_CHECKSUM: 724 if (val) { 725 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 726 inet_inc_convert_csum(sk); 727 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 728 } 729 } else { 730 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 731 inet_dec_convert_csum(sk); 732 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 733 } 734 } 735 break; 736 case IP_RECVFRAGSIZE: 737 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 738 goto e_inval; 739 if (val) 740 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 741 else 742 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 743 break; 744 case IP_TOS: /* This sets both TOS and Precedence */ 745 if (sk->sk_type == SOCK_STREAM) { 746 val &= ~INET_ECN_MASK; 747 val |= inet->tos & INET_ECN_MASK; 748 } 749 if (inet->tos != val) { 750 inet->tos = val; 751 sk->sk_priority = rt_tos2priority(val); 752 sk_dst_reset(sk); 753 } 754 break; 755 case IP_TTL: 756 if (optlen < 1) 757 goto e_inval; 758 if (val != -1 && (val < 1 || val > 255)) 759 goto e_inval; 760 inet->uc_ttl = val; 761 break; 762 case IP_HDRINCL: 763 if (sk->sk_type != SOCK_RAW) { 764 err = -ENOPROTOOPT; 765 break; 766 } 767 inet->hdrincl = val ? 1 : 0; 768 break; 769 case IP_NODEFRAG: 770 if (sk->sk_type != SOCK_RAW) { 771 err = -ENOPROTOOPT; 772 break; 773 } 774 inet->nodefrag = val ? 1 : 0; 775 break; 776 case IP_BIND_ADDRESS_NO_PORT: 777 inet->bind_address_no_port = val ? 1 : 0; 778 break; 779 case IP_MTU_DISCOVER: 780 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 781 goto e_inval; 782 inet->pmtudisc = val; 783 break; 784 case IP_RECVERR: 785 inet->recverr = !!val; 786 if (!val) 787 skb_queue_purge(&sk->sk_error_queue); 788 break; 789 case IP_MULTICAST_TTL: 790 if (sk->sk_type == SOCK_STREAM) 791 goto e_inval; 792 if (optlen < 1) 793 goto e_inval; 794 if (val == -1) 795 val = 1; 796 if (val < 0 || val > 255) 797 goto e_inval; 798 inet->mc_ttl = val; 799 break; 800 case IP_MULTICAST_LOOP: 801 if (optlen < 1) 802 goto e_inval; 803 inet->mc_loop = !!val; 804 break; 805 case IP_UNICAST_IF: 806 { 807 struct net_device *dev = NULL; 808 int ifindex; 809 810 if (optlen != sizeof(int)) 811 goto e_inval; 812 813 ifindex = (__force int)ntohl((__force __be32)val); 814 if (ifindex == 0) { 815 inet->uc_index = 0; 816 err = 0; 817 break; 818 } 819 820 dev = dev_get_by_index(sock_net(sk), ifindex); 821 err = -EADDRNOTAVAIL; 822 if (!dev) 823 break; 824 dev_put(dev); 825 826 err = -EINVAL; 827 if (sk->sk_bound_dev_if) 828 break; 829 830 inet->uc_index = ifindex; 831 err = 0; 832 break; 833 } 834 case IP_MULTICAST_IF: 835 { 836 struct ip_mreqn mreq; 837 struct net_device *dev = NULL; 838 int midx; 839 840 if (sk->sk_type == SOCK_STREAM) 841 goto e_inval; 842 /* 843 * Check the arguments are allowable 844 */ 845 846 if (optlen < sizeof(struct in_addr)) 847 goto e_inval; 848 849 err = -EFAULT; 850 if (optlen >= sizeof(struct ip_mreqn)) { 851 if (copy_from_user(&mreq, optval, sizeof(mreq))) 852 break; 853 } else { 854 memset(&mreq, 0, sizeof(mreq)); 855 if (optlen >= sizeof(struct ip_mreq)) { 856 if (copy_from_user(&mreq, optval, 857 sizeof(struct ip_mreq))) 858 break; 859 } else if (optlen >= sizeof(struct in_addr)) { 860 if (copy_from_user(&mreq.imr_address, optval, 861 sizeof(struct in_addr))) 862 break; 863 } 864 } 865 866 if (!mreq.imr_ifindex) { 867 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 868 inet->mc_index = 0; 869 inet->mc_addr = 0; 870 err = 0; 871 break; 872 } 873 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 874 if (dev) 875 mreq.imr_ifindex = dev->ifindex; 876 } else 877 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 878 879 880 err = -EADDRNOTAVAIL; 881 if (!dev) 882 break; 883 884 midx = l3mdev_master_ifindex(dev); 885 886 dev_put(dev); 887 888 err = -EINVAL; 889 if (sk->sk_bound_dev_if && 890 mreq.imr_ifindex != sk->sk_bound_dev_if && 891 (!midx || midx != sk->sk_bound_dev_if)) 892 break; 893 894 inet->mc_index = mreq.imr_ifindex; 895 inet->mc_addr = mreq.imr_address.s_addr; 896 err = 0; 897 break; 898 } 899 900 case IP_ADD_MEMBERSHIP: 901 case IP_DROP_MEMBERSHIP: 902 { 903 struct ip_mreqn mreq; 904 905 err = -EPROTO; 906 if (inet_sk(sk)->is_icsk) 907 break; 908 909 if (optlen < sizeof(struct ip_mreq)) 910 goto e_inval; 911 err = -EFAULT; 912 if (optlen >= sizeof(struct ip_mreqn)) { 913 if (copy_from_user(&mreq, optval, sizeof(mreq))) 914 break; 915 } else { 916 memset(&mreq, 0, sizeof(mreq)); 917 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 918 break; 919 } 920 921 if (optname == IP_ADD_MEMBERSHIP) 922 err = ip_mc_join_group(sk, &mreq); 923 else 924 err = ip_mc_leave_group(sk, &mreq); 925 break; 926 } 927 case IP_MSFILTER: 928 { 929 struct ip_msfilter *msf; 930 931 if (optlen < IP_MSFILTER_SIZE(0)) 932 goto e_inval; 933 if (optlen > sysctl_optmem_max) { 934 err = -ENOBUFS; 935 break; 936 } 937 msf = memdup_user(optval, optlen); 938 if (IS_ERR(msf)) { 939 err = PTR_ERR(msf); 940 break; 941 } 942 /* numsrc >= (1G-4) overflow in 32 bits */ 943 if (msf->imsf_numsrc >= 0x3ffffffcU || 944 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 945 kfree(msf); 946 err = -ENOBUFS; 947 break; 948 } 949 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 950 kfree(msf); 951 err = -EINVAL; 952 break; 953 } 954 err = ip_mc_msfilter(sk, msf, 0); 955 kfree(msf); 956 break; 957 } 958 case IP_BLOCK_SOURCE: 959 case IP_UNBLOCK_SOURCE: 960 case IP_ADD_SOURCE_MEMBERSHIP: 961 case IP_DROP_SOURCE_MEMBERSHIP: 962 { 963 struct ip_mreq_source mreqs; 964 int omode, add; 965 966 if (optlen != sizeof(struct ip_mreq_source)) 967 goto e_inval; 968 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 969 err = -EFAULT; 970 break; 971 } 972 if (optname == IP_BLOCK_SOURCE) { 973 omode = MCAST_EXCLUDE; 974 add = 1; 975 } else if (optname == IP_UNBLOCK_SOURCE) { 976 omode = MCAST_EXCLUDE; 977 add = 0; 978 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 979 struct ip_mreqn mreq; 980 981 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 982 mreq.imr_address.s_addr = mreqs.imr_interface; 983 mreq.imr_ifindex = 0; 984 err = ip_mc_join_group(sk, &mreq); 985 if (err && err != -EADDRINUSE) 986 break; 987 omode = MCAST_INCLUDE; 988 add = 1; 989 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 990 omode = MCAST_INCLUDE; 991 add = 0; 992 } 993 err = ip_mc_source(add, omode, sk, &mreqs, 0); 994 break; 995 } 996 case MCAST_JOIN_GROUP: 997 case MCAST_LEAVE_GROUP: 998 { 999 struct group_req greq; 1000 struct sockaddr_in *psin; 1001 struct ip_mreqn mreq; 1002 1003 if (optlen < sizeof(struct group_req)) 1004 goto e_inval; 1005 err = -EFAULT; 1006 if (copy_from_user(&greq, optval, sizeof(greq))) 1007 break; 1008 psin = (struct sockaddr_in *)&greq.gr_group; 1009 if (psin->sin_family != AF_INET) 1010 goto e_inval; 1011 memset(&mreq, 0, sizeof(mreq)); 1012 mreq.imr_multiaddr = psin->sin_addr; 1013 mreq.imr_ifindex = greq.gr_interface; 1014 1015 if (optname == MCAST_JOIN_GROUP) 1016 err = ip_mc_join_group(sk, &mreq); 1017 else 1018 err = ip_mc_leave_group(sk, &mreq); 1019 break; 1020 } 1021 case MCAST_JOIN_SOURCE_GROUP: 1022 case MCAST_LEAVE_SOURCE_GROUP: 1023 case MCAST_BLOCK_SOURCE: 1024 case MCAST_UNBLOCK_SOURCE: 1025 { 1026 struct group_source_req greqs; 1027 struct ip_mreq_source mreqs; 1028 struct sockaddr_in *psin; 1029 int omode, add; 1030 1031 if (optlen != sizeof(struct group_source_req)) 1032 goto e_inval; 1033 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1034 err = -EFAULT; 1035 break; 1036 } 1037 if (greqs.gsr_group.ss_family != AF_INET || 1038 greqs.gsr_source.ss_family != AF_INET) { 1039 err = -EADDRNOTAVAIL; 1040 break; 1041 } 1042 psin = (struct sockaddr_in *)&greqs.gsr_group; 1043 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1044 psin = (struct sockaddr_in *)&greqs.gsr_source; 1045 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1046 mreqs.imr_interface = 0; /* use index for mc_source */ 1047 1048 if (optname == MCAST_BLOCK_SOURCE) { 1049 omode = MCAST_EXCLUDE; 1050 add = 1; 1051 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1052 omode = MCAST_EXCLUDE; 1053 add = 0; 1054 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1055 struct ip_mreqn mreq; 1056 1057 psin = (struct sockaddr_in *)&greqs.gsr_group; 1058 mreq.imr_multiaddr = psin->sin_addr; 1059 mreq.imr_address.s_addr = 0; 1060 mreq.imr_ifindex = greqs.gsr_interface; 1061 err = ip_mc_join_group(sk, &mreq); 1062 if (err && err != -EADDRINUSE) 1063 break; 1064 greqs.gsr_interface = mreq.imr_ifindex; 1065 omode = MCAST_INCLUDE; 1066 add = 1; 1067 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1068 omode = MCAST_INCLUDE; 1069 add = 0; 1070 } 1071 err = ip_mc_source(add, omode, sk, &mreqs, 1072 greqs.gsr_interface); 1073 break; 1074 } 1075 case MCAST_MSFILTER: 1076 { 1077 struct sockaddr_in *psin; 1078 struct ip_msfilter *msf = NULL; 1079 struct group_filter *gsf = NULL; 1080 int msize, i, ifindex; 1081 1082 if (optlen < GROUP_FILTER_SIZE(0)) 1083 goto e_inval; 1084 if (optlen > sysctl_optmem_max) { 1085 err = -ENOBUFS; 1086 break; 1087 } 1088 gsf = memdup_user(optval, optlen); 1089 if (IS_ERR(gsf)) { 1090 err = PTR_ERR(gsf); 1091 break; 1092 } 1093 1094 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1095 if (gsf->gf_numsrc >= 0x1ffffff || 1096 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1097 err = -ENOBUFS; 1098 goto mc_msf_out; 1099 } 1100 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1101 err = -EINVAL; 1102 goto mc_msf_out; 1103 } 1104 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1105 msf = kmalloc(msize, GFP_KERNEL); 1106 if (!msf) { 1107 err = -ENOBUFS; 1108 goto mc_msf_out; 1109 } 1110 ifindex = gsf->gf_interface; 1111 psin = (struct sockaddr_in *)&gsf->gf_group; 1112 if (psin->sin_family != AF_INET) { 1113 err = -EADDRNOTAVAIL; 1114 goto mc_msf_out; 1115 } 1116 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1117 msf->imsf_interface = 0; 1118 msf->imsf_fmode = gsf->gf_fmode; 1119 msf->imsf_numsrc = gsf->gf_numsrc; 1120 err = -EADDRNOTAVAIL; 1121 for (i = 0; i < gsf->gf_numsrc; ++i) { 1122 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1123 1124 if (psin->sin_family != AF_INET) 1125 goto mc_msf_out; 1126 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1127 } 1128 kfree(gsf); 1129 gsf = NULL; 1130 1131 err = ip_mc_msfilter(sk, msf, ifindex); 1132 mc_msf_out: 1133 kfree(msf); 1134 kfree(gsf); 1135 break; 1136 } 1137 case IP_MULTICAST_ALL: 1138 if (optlen < 1) 1139 goto e_inval; 1140 if (val != 0 && val != 1) 1141 goto e_inval; 1142 inet->mc_all = val; 1143 break; 1144 case IP_ROUTER_ALERT: 1145 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1146 break; 1147 1148 case IP_FREEBIND: 1149 if (optlen < 1) 1150 goto e_inval; 1151 inet->freebind = !!val; 1152 break; 1153 1154 case IP_IPSEC_POLICY: 1155 case IP_XFRM_POLICY: 1156 err = -EPERM; 1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1158 break; 1159 err = xfrm_user_policy(sk, optname, optval, optlen); 1160 break; 1161 1162 case IP_TRANSPARENT: 1163 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1164 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1165 err = -EPERM; 1166 break; 1167 } 1168 if (optlen < 1) 1169 goto e_inval; 1170 inet->transparent = !!val; 1171 break; 1172 1173 case IP_MINTTL: 1174 if (optlen < 1) 1175 goto e_inval; 1176 if (val < 0 || val > 255) 1177 goto e_inval; 1178 inet->min_ttl = val; 1179 break; 1180 1181 default: 1182 err = -ENOPROTOOPT; 1183 break; 1184 } 1185 release_sock(sk); 1186 if (needs_rtnl) 1187 rtnl_unlock(); 1188 return err; 1189 1190 e_inval: 1191 release_sock(sk); 1192 if (needs_rtnl) 1193 rtnl_unlock(); 1194 return -EINVAL; 1195 } 1196 1197 /** 1198 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1199 * @sk: socket 1200 * @skb: buffer 1201 * 1202 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1203 * destination in skb->cb[] before dst drop. 1204 * This way, receiver doesn't make cache line misses to read rtable. 1205 */ 1206 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1207 { 1208 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1209 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1210 ipv6_sk_rxinfo(sk); 1211 1212 if (prepare && skb_rtable(skb)) { 1213 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1214 * which has interface index (iif) as the first member of the 1215 * underlying inet{6}_skb_parm struct. This code then overlays 1216 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1217 * element so the iif is picked up from the prior IPCB. If iif 1218 * is the loopback interface, then return the sending interface 1219 * (e.g., process binds socket to eth0 for Tx which is 1220 * redirected to loopback in the rtable/dst). 1221 */ 1222 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1223 pktinfo->ipi_ifindex = inet_iif(skb); 1224 1225 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1226 } else { 1227 pktinfo->ipi_ifindex = 0; 1228 pktinfo->ipi_spec_dst.s_addr = 0; 1229 } 1230 /* We need to keep the dst for __ip_options_echo() 1231 * We could restrict the test to opt.ts_needtime || opt.srr, 1232 * but the following is good enough as IP options are not often used. 1233 */ 1234 if (unlikely(IPCB(skb)->opt.optlen)) 1235 skb_dst_force(skb); 1236 else 1237 skb_dst_drop(skb); 1238 } 1239 1240 int ip_setsockopt(struct sock *sk, int level, 1241 int optname, char __user *optval, unsigned int optlen) 1242 { 1243 int err; 1244 1245 if (level != SOL_IP) 1246 return -ENOPROTOOPT; 1247 1248 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1249 #ifdef CONFIG_NETFILTER 1250 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1251 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1252 optname != IP_IPSEC_POLICY && 1253 optname != IP_XFRM_POLICY && 1254 !ip_mroute_opt(optname)) { 1255 lock_sock(sk); 1256 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1257 release_sock(sk); 1258 } 1259 #endif 1260 return err; 1261 } 1262 EXPORT_SYMBOL(ip_setsockopt); 1263 1264 #ifdef CONFIG_COMPAT 1265 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1266 char __user *optval, unsigned int optlen) 1267 { 1268 int err; 1269 1270 if (level != SOL_IP) 1271 return -ENOPROTOOPT; 1272 1273 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1274 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1275 ip_setsockopt); 1276 1277 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1278 #ifdef CONFIG_NETFILTER 1279 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1280 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1281 optname != IP_IPSEC_POLICY && 1282 optname != IP_XFRM_POLICY && 1283 !ip_mroute_opt(optname)) { 1284 lock_sock(sk); 1285 err = compat_nf_setsockopt(sk, PF_INET, optname, 1286 optval, optlen); 1287 release_sock(sk); 1288 } 1289 #endif 1290 return err; 1291 } 1292 EXPORT_SYMBOL(compat_ip_setsockopt); 1293 #endif 1294 1295 /* 1296 * Get the options. Note for future reference. The GET of IP options gets 1297 * the _received_ ones. The set sets the _sent_ ones. 1298 */ 1299 1300 static bool getsockopt_needs_rtnl(int optname) 1301 { 1302 switch (optname) { 1303 case IP_MSFILTER: 1304 case MCAST_MSFILTER: 1305 return true; 1306 } 1307 return false; 1308 } 1309 1310 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1311 char __user *optval, int __user *optlen, unsigned int flags) 1312 { 1313 struct inet_sock *inet = inet_sk(sk); 1314 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1315 int val, err = 0; 1316 int len; 1317 1318 if (level != SOL_IP) 1319 return -EOPNOTSUPP; 1320 1321 if (ip_mroute_opt(optname)) 1322 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1323 1324 if (get_user(len, optlen)) 1325 return -EFAULT; 1326 if (len < 0) 1327 return -EINVAL; 1328 1329 if (needs_rtnl) 1330 rtnl_lock(); 1331 lock_sock(sk); 1332 1333 switch (optname) { 1334 case IP_OPTIONS: 1335 { 1336 unsigned char optbuf[sizeof(struct ip_options)+40]; 1337 struct ip_options *opt = (struct ip_options *)optbuf; 1338 struct ip_options_rcu *inet_opt; 1339 1340 inet_opt = rcu_dereference_protected(inet->inet_opt, 1341 lockdep_sock_is_held(sk)); 1342 opt->optlen = 0; 1343 if (inet_opt) 1344 memcpy(optbuf, &inet_opt->opt, 1345 sizeof(struct ip_options) + 1346 inet_opt->opt.optlen); 1347 release_sock(sk); 1348 1349 if (opt->optlen == 0) 1350 return put_user(0, optlen); 1351 1352 ip_options_undo(opt); 1353 1354 len = min_t(unsigned int, len, opt->optlen); 1355 if (put_user(len, optlen)) 1356 return -EFAULT; 1357 if (copy_to_user(optval, opt->__data, len)) 1358 return -EFAULT; 1359 return 0; 1360 } 1361 case IP_PKTINFO: 1362 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1363 break; 1364 case IP_RECVTTL: 1365 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1366 break; 1367 case IP_RECVTOS: 1368 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1369 break; 1370 case IP_RECVOPTS: 1371 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1372 break; 1373 case IP_RETOPTS: 1374 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1375 break; 1376 case IP_PASSSEC: 1377 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1378 break; 1379 case IP_RECVORIGDSTADDR: 1380 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1381 break; 1382 case IP_CHECKSUM: 1383 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1384 break; 1385 case IP_RECVFRAGSIZE: 1386 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1387 break; 1388 case IP_TOS: 1389 val = inet->tos; 1390 break; 1391 case IP_TTL: 1392 { 1393 struct net *net = sock_net(sk); 1394 val = (inet->uc_ttl == -1 ? 1395 net->ipv4.sysctl_ip_default_ttl : 1396 inet->uc_ttl); 1397 break; 1398 } 1399 case IP_HDRINCL: 1400 val = inet->hdrincl; 1401 break; 1402 case IP_NODEFRAG: 1403 val = inet->nodefrag; 1404 break; 1405 case IP_BIND_ADDRESS_NO_PORT: 1406 val = inet->bind_address_no_port; 1407 break; 1408 case IP_MTU_DISCOVER: 1409 val = inet->pmtudisc; 1410 break; 1411 case IP_MTU: 1412 { 1413 struct dst_entry *dst; 1414 val = 0; 1415 dst = sk_dst_get(sk); 1416 if (dst) { 1417 val = dst_mtu(dst); 1418 dst_release(dst); 1419 } 1420 if (!val) { 1421 release_sock(sk); 1422 return -ENOTCONN; 1423 } 1424 break; 1425 } 1426 case IP_RECVERR: 1427 val = inet->recverr; 1428 break; 1429 case IP_MULTICAST_TTL: 1430 val = inet->mc_ttl; 1431 break; 1432 case IP_MULTICAST_LOOP: 1433 val = inet->mc_loop; 1434 break; 1435 case IP_UNICAST_IF: 1436 val = (__force int)htonl((__u32) inet->uc_index); 1437 break; 1438 case IP_MULTICAST_IF: 1439 { 1440 struct in_addr addr; 1441 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1442 addr.s_addr = inet->mc_addr; 1443 release_sock(sk); 1444 1445 if (put_user(len, optlen)) 1446 return -EFAULT; 1447 if (copy_to_user(optval, &addr, len)) 1448 return -EFAULT; 1449 return 0; 1450 } 1451 case IP_MSFILTER: 1452 { 1453 struct ip_msfilter msf; 1454 1455 if (len < IP_MSFILTER_SIZE(0)) { 1456 err = -EINVAL; 1457 goto out; 1458 } 1459 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1460 err = -EFAULT; 1461 goto out; 1462 } 1463 err = ip_mc_msfget(sk, &msf, 1464 (struct ip_msfilter __user *)optval, optlen); 1465 goto out; 1466 } 1467 case MCAST_MSFILTER: 1468 { 1469 struct group_filter gsf; 1470 1471 if (len < GROUP_FILTER_SIZE(0)) { 1472 err = -EINVAL; 1473 goto out; 1474 } 1475 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1476 err = -EFAULT; 1477 goto out; 1478 } 1479 err = ip_mc_gsfget(sk, &gsf, 1480 (struct group_filter __user *)optval, 1481 optlen); 1482 goto out; 1483 } 1484 case IP_MULTICAST_ALL: 1485 val = inet->mc_all; 1486 break; 1487 case IP_PKTOPTIONS: 1488 { 1489 struct msghdr msg; 1490 1491 release_sock(sk); 1492 1493 if (sk->sk_type != SOCK_STREAM) 1494 return -ENOPROTOOPT; 1495 1496 msg.msg_control = (__force void *) optval; 1497 msg.msg_controllen = len; 1498 msg.msg_flags = flags; 1499 1500 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1501 struct in_pktinfo info; 1502 1503 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1504 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1505 info.ipi_ifindex = inet->mc_index; 1506 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1507 } 1508 if (inet->cmsg_flags & IP_CMSG_TTL) { 1509 int hlim = inet->mc_ttl; 1510 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1511 } 1512 if (inet->cmsg_flags & IP_CMSG_TOS) { 1513 int tos = inet->rcv_tos; 1514 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1515 } 1516 len -= msg.msg_controllen; 1517 return put_user(len, optlen); 1518 } 1519 case IP_FREEBIND: 1520 val = inet->freebind; 1521 break; 1522 case IP_TRANSPARENT: 1523 val = inet->transparent; 1524 break; 1525 case IP_MINTTL: 1526 val = inet->min_ttl; 1527 break; 1528 default: 1529 release_sock(sk); 1530 return -ENOPROTOOPT; 1531 } 1532 release_sock(sk); 1533 1534 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1535 unsigned char ucval = (unsigned char)val; 1536 len = 1; 1537 if (put_user(len, optlen)) 1538 return -EFAULT; 1539 if (copy_to_user(optval, &ucval, 1)) 1540 return -EFAULT; 1541 } else { 1542 len = min_t(unsigned int, sizeof(int), len); 1543 if (put_user(len, optlen)) 1544 return -EFAULT; 1545 if (copy_to_user(optval, &val, len)) 1546 return -EFAULT; 1547 } 1548 return 0; 1549 1550 out: 1551 release_sock(sk); 1552 if (needs_rtnl) 1553 rtnl_unlock(); 1554 return err; 1555 } 1556 1557 int ip_getsockopt(struct sock *sk, int level, 1558 int optname, char __user *optval, int __user *optlen) 1559 { 1560 int err; 1561 1562 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1563 #ifdef CONFIG_NETFILTER 1564 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1565 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1566 !ip_mroute_opt(optname)) { 1567 int len; 1568 1569 if (get_user(len, optlen)) 1570 return -EFAULT; 1571 1572 lock_sock(sk); 1573 err = nf_getsockopt(sk, PF_INET, optname, optval, 1574 &len); 1575 release_sock(sk); 1576 if (err >= 0) 1577 err = put_user(len, optlen); 1578 return err; 1579 } 1580 #endif 1581 return err; 1582 } 1583 EXPORT_SYMBOL(ip_getsockopt); 1584 1585 #ifdef CONFIG_COMPAT 1586 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1587 char __user *optval, int __user *optlen) 1588 { 1589 int err; 1590 1591 if (optname == MCAST_MSFILTER) 1592 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1593 ip_getsockopt); 1594 1595 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1596 MSG_CMSG_COMPAT); 1597 1598 #ifdef CONFIG_NETFILTER 1599 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1600 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1601 !ip_mroute_opt(optname)) { 1602 int len; 1603 1604 if (get_user(len, optlen)) 1605 return -EFAULT; 1606 1607 lock_sock(sk); 1608 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1609 release_sock(sk); 1610 if (err >= 0) 1611 err = put_user(len, optlen); 1612 return err; 1613 } 1614 #endif 1615 return err; 1616 } 1617 EXPORT_SYMBOL(compat_ip_getsockopt); 1618 #endif 1619