1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * The IP to API glue. 8 * 9 * Authors: see ip.c 10 * 11 * Fixes: 12 * Many : Split from ip.c , see ip.c for history. 13 * Martin Mares : TOS setting fixed. 14 * Alan Cox : Fixed a couple of oopses in Martin's 15 * TOS tweaks. 16 * Mike McLagan : Routing by source 17 */ 18 19 #include <linux/module.h> 20 #include <linux/types.h> 21 #include <linux/mm.h> 22 #include <linux/skbuff.h> 23 #include <linux/ip.h> 24 #include <linux/icmp.h> 25 #include <linux/inetdevice.h> 26 #include <linux/netdevice.h> 27 #include <linux/slab.h> 28 #include <net/sock.h> 29 #include <net/ip.h> 30 #include <net/icmp.h> 31 #include <net/tcp_states.h> 32 #include <linux/udp.h> 33 #include <linux/igmp.h> 34 #include <linux/netfilter.h> 35 #include <linux/route.h> 36 #include <linux/mroute.h> 37 #include <net/inet_ecn.h> 38 #include <net/route.h> 39 #include <net/xfrm.h> 40 #include <net/compat.h> 41 #include <net/checksum.h> 42 #if IS_ENABLED(CONFIG_IPV6) 43 #include <net/transp_v6.h> 44 #endif 45 #include <net/ip_fib.h> 46 47 #include <linux/errqueue.h> 48 #include <linux/uaccess.h> 49 50 /* 51 * SOL_IP control messages. 52 */ 53 54 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 55 { 56 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 57 58 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 59 60 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 61 } 62 63 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 64 { 65 int ttl = ip_hdr(skb)->ttl; 66 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 67 } 68 69 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 70 { 71 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 72 } 73 74 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 75 { 76 if (IPCB(skb)->opt.optlen == 0) 77 return; 78 79 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 80 ip_hdr(skb) + 1); 81 } 82 83 84 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, 85 struct sk_buff *skb) 86 { 87 unsigned char optbuf[sizeof(struct ip_options) + 40]; 88 struct ip_options *opt = (struct ip_options *)optbuf; 89 90 if (IPCB(skb)->opt.optlen == 0) 91 return; 92 93 if (ip_options_echo(net, opt, skb)) { 94 msg->msg_flags |= MSG_CTRUNC; 95 return; 96 } 97 ip_options_undo(opt); 98 99 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 100 } 101 102 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) 103 { 104 int val; 105 106 if (IPCB(skb)->frag_max_size == 0) 107 return; 108 109 val = IPCB(skb)->frag_max_size; 110 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 111 } 112 113 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 114 int tlen, int offset) 115 { 116 __wsum csum = skb->csum; 117 118 if (skb->ip_summed != CHECKSUM_COMPLETE) 119 return; 120 121 if (offset != 0) { 122 int tend_off = skb_transport_offset(skb) + tlen; 123 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 124 } 125 126 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 127 } 128 129 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 130 { 131 char *secdata; 132 u32 seclen, secid; 133 int err; 134 135 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 136 if (err) 137 return; 138 139 err = security_secid_to_secctx(secid, &secdata, &seclen); 140 if (err) 141 return; 142 143 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 144 security_release_secctx(secdata, seclen); 145 } 146 147 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 148 { 149 struct sockaddr_in sin; 150 const struct iphdr *iph = ip_hdr(skb); 151 __be16 *ports = (__be16 *)skb_transport_header(skb); 152 153 if (skb_transport_offset(skb) + 4 > (int)skb->len) 154 return; 155 156 /* All current transport protocols have the port numbers in the 157 * first four bytes of the transport header and this function is 158 * written with this assumption in mind. 159 */ 160 161 sin.sin_family = AF_INET; 162 sin.sin_addr.s_addr = iph->daddr; 163 sin.sin_port = ports[1]; 164 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 165 166 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 167 } 168 169 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 170 struct sk_buff *skb, int tlen, int offset) 171 { 172 struct inet_sock *inet = inet_sk(sk); 173 unsigned int flags = inet->cmsg_flags; 174 175 /* Ordered by supposed usage frequency */ 176 if (flags & IP_CMSG_PKTINFO) { 177 ip_cmsg_recv_pktinfo(msg, skb); 178 179 flags &= ~IP_CMSG_PKTINFO; 180 if (!flags) 181 return; 182 } 183 184 if (flags & IP_CMSG_TTL) { 185 ip_cmsg_recv_ttl(msg, skb); 186 187 flags &= ~IP_CMSG_TTL; 188 if (!flags) 189 return; 190 } 191 192 if (flags & IP_CMSG_TOS) { 193 ip_cmsg_recv_tos(msg, skb); 194 195 flags &= ~IP_CMSG_TOS; 196 if (!flags) 197 return; 198 } 199 200 if (flags & IP_CMSG_RECVOPTS) { 201 ip_cmsg_recv_opts(msg, skb); 202 203 flags &= ~IP_CMSG_RECVOPTS; 204 if (!flags) 205 return; 206 } 207 208 if (flags & IP_CMSG_RETOPTS) { 209 ip_cmsg_recv_retopts(sock_net(sk), msg, skb); 210 211 flags &= ~IP_CMSG_RETOPTS; 212 if (!flags) 213 return; 214 } 215 216 if (flags & IP_CMSG_PASSSEC) { 217 ip_cmsg_recv_security(msg, skb); 218 219 flags &= ~IP_CMSG_PASSSEC; 220 if (!flags) 221 return; 222 } 223 224 if (flags & IP_CMSG_ORIGDSTADDR) { 225 ip_cmsg_recv_dstaddr(msg, skb); 226 227 flags &= ~IP_CMSG_ORIGDSTADDR; 228 if (!flags) 229 return; 230 } 231 232 if (flags & IP_CMSG_CHECKSUM) 233 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 234 235 if (flags & IP_CMSG_RECVFRAGSIZE) 236 ip_cmsg_recv_fragsize(msg, skb); 237 } 238 EXPORT_SYMBOL(ip_cmsg_recv_offset); 239 240 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 241 bool allow_ipv6) 242 { 243 int err, val; 244 struct cmsghdr *cmsg; 245 struct net *net = sock_net(sk); 246 247 for_each_cmsghdr(cmsg, msg) { 248 if (!CMSG_OK(msg, cmsg)) 249 return -EINVAL; 250 #if IS_ENABLED(CONFIG_IPV6) 251 if (allow_ipv6 && 252 cmsg->cmsg_level == SOL_IPV6 && 253 cmsg->cmsg_type == IPV6_PKTINFO) { 254 struct in6_pktinfo *src_info; 255 256 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 257 return -EINVAL; 258 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 259 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 260 return -EINVAL; 261 if (src_info->ipi6_ifindex) 262 ipc->oif = src_info->ipi6_ifindex; 263 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 264 continue; 265 } 266 #endif 267 if (cmsg->cmsg_level == SOL_SOCKET) { 268 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 269 if (err) 270 return err; 271 continue; 272 } 273 274 if (cmsg->cmsg_level != SOL_IP) 275 continue; 276 switch (cmsg->cmsg_type) { 277 case IP_RETOPTS: 278 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 279 280 /* Our caller is responsible for freeing ipc->opt */ 281 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 282 err < 40 ? err : 40); 283 if (err) 284 return err; 285 break; 286 case IP_PKTINFO: 287 { 288 struct in_pktinfo *info; 289 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 290 return -EINVAL; 291 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 292 if (info->ipi_ifindex) 293 ipc->oif = info->ipi_ifindex; 294 ipc->addr = info->ipi_spec_dst.s_addr; 295 break; 296 } 297 case IP_TTL: 298 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 299 return -EINVAL; 300 val = *(int *)CMSG_DATA(cmsg); 301 if (val < 1 || val > 255) 302 return -EINVAL; 303 ipc->ttl = val; 304 break; 305 case IP_TOS: 306 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 307 val = *(int *)CMSG_DATA(cmsg); 308 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 309 val = *(u8 *)CMSG_DATA(cmsg); 310 else 311 return -EINVAL; 312 if (val < 0 || val > 255) 313 return -EINVAL; 314 ipc->tos = val; 315 ipc->priority = rt_tos2priority(ipc->tos); 316 break; 317 318 default: 319 return -EINVAL; 320 } 321 } 322 return 0; 323 } 324 325 static void ip_ra_destroy_rcu(struct rcu_head *head) 326 { 327 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 328 329 sock_put(ra->saved_sk); 330 kfree(ra); 331 } 332 333 int ip_ra_control(struct sock *sk, unsigned char on, 334 void (*destructor)(struct sock *)) 335 { 336 struct ip_ra_chain *ra, *new_ra; 337 struct ip_ra_chain __rcu **rap; 338 struct net *net = sock_net(sk); 339 340 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 341 return -EINVAL; 342 343 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 344 345 mutex_lock(&net->ipv4.ra_mutex); 346 for (rap = &net->ipv4.ra_chain; 347 (ra = rcu_dereference_protected(*rap, 348 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; 349 rap = &ra->next) { 350 if (ra->sk == sk) { 351 if (on) { 352 mutex_unlock(&net->ipv4.ra_mutex); 353 kfree(new_ra); 354 return -EADDRINUSE; 355 } 356 /* dont let ip_call_ra_chain() use sk again */ 357 ra->sk = NULL; 358 RCU_INIT_POINTER(*rap, ra->next); 359 mutex_unlock(&net->ipv4.ra_mutex); 360 361 if (ra->destructor) 362 ra->destructor(sk); 363 /* 364 * Delay sock_put(sk) and kfree(ra) after one rcu grace 365 * period. This guarantee ip_call_ra_chain() dont need 366 * to mess with socket refcounts. 367 */ 368 ra->saved_sk = sk; 369 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 370 return 0; 371 } 372 } 373 if (!new_ra) { 374 mutex_unlock(&net->ipv4.ra_mutex); 375 return -ENOBUFS; 376 } 377 new_ra->sk = sk; 378 new_ra->destructor = destructor; 379 380 RCU_INIT_POINTER(new_ra->next, ra); 381 rcu_assign_pointer(*rap, new_ra); 382 sock_hold(sk); 383 mutex_unlock(&net->ipv4.ra_mutex); 384 385 return 0; 386 } 387 388 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 389 __be16 port, u32 info, u8 *payload) 390 { 391 struct sock_exterr_skb *serr; 392 393 skb = skb_clone(skb, GFP_ATOMIC); 394 if (!skb) 395 return; 396 397 serr = SKB_EXT_ERR(skb); 398 serr->ee.ee_errno = err; 399 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 400 serr->ee.ee_type = icmp_hdr(skb)->type; 401 serr->ee.ee_code = icmp_hdr(skb)->code; 402 serr->ee.ee_pad = 0; 403 serr->ee.ee_info = info; 404 serr->ee.ee_data = 0; 405 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 406 skb_network_header(skb); 407 serr->port = port; 408 409 if (skb_pull(skb, payload - skb->data)) { 410 skb_reset_transport_header(skb); 411 if (sock_queue_err_skb(sk, skb) == 0) 412 return; 413 } 414 kfree_skb(skb); 415 } 416 417 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 418 { 419 struct inet_sock *inet = inet_sk(sk); 420 struct sock_exterr_skb *serr; 421 struct iphdr *iph; 422 struct sk_buff *skb; 423 424 if (!inet->recverr) 425 return; 426 427 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 428 if (!skb) 429 return; 430 431 skb_put(skb, sizeof(struct iphdr)); 432 skb_reset_network_header(skb); 433 iph = ip_hdr(skb); 434 iph->daddr = daddr; 435 436 serr = SKB_EXT_ERR(skb); 437 serr->ee.ee_errno = err; 438 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 439 serr->ee.ee_type = 0; 440 serr->ee.ee_code = 0; 441 serr->ee.ee_pad = 0; 442 serr->ee.ee_info = info; 443 serr->ee.ee_data = 0; 444 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 445 serr->port = port; 446 447 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 448 skb_reset_transport_header(skb); 449 450 if (sock_queue_err_skb(sk, skb)) 451 kfree_skb(skb); 452 } 453 454 /* For some errors we have valid addr_offset even with zero payload and 455 * zero port. Also, addr_offset should be supported if port is set. 456 */ 457 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 458 { 459 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 460 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 461 } 462 463 /* IPv4 supports cmsg on all imcp errors and some timestamps 464 * 465 * Timestamp code paths do not initialize the fields expected by cmsg: 466 * the PKTINFO fields in skb->cb[]. Fill those in here. 467 */ 468 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 469 struct sk_buff *skb, 470 int ee_origin) 471 { 472 struct in_pktinfo *info; 473 474 if (ee_origin == SO_EE_ORIGIN_ICMP) 475 return true; 476 477 if (ee_origin == SO_EE_ORIGIN_LOCAL) 478 return false; 479 480 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 481 * timestamp with egress dev. Not possible for packets without iif 482 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 483 */ 484 info = PKTINFO_SKB_CB(skb); 485 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 486 !info->ipi_ifindex) 487 return false; 488 489 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 490 return true; 491 } 492 493 /* 494 * Handle MSG_ERRQUEUE 495 */ 496 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 497 { 498 struct sock_exterr_skb *serr; 499 struct sk_buff *skb; 500 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 501 struct { 502 struct sock_extended_err ee; 503 struct sockaddr_in offender; 504 } errhdr; 505 int err; 506 int copied; 507 508 err = -EAGAIN; 509 skb = sock_dequeue_err_skb(sk); 510 if (!skb) 511 goto out; 512 513 copied = skb->len; 514 if (copied > len) { 515 msg->msg_flags |= MSG_TRUNC; 516 copied = len; 517 } 518 err = skb_copy_datagram_msg(skb, 0, msg, copied); 519 if (unlikely(err)) { 520 kfree_skb(skb); 521 return err; 522 } 523 sock_recv_timestamp(msg, sk, skb); 524 525 serr = SKB_EXT_ERR(skb); 526 527 if (sin && ipv4_datagram_support_addr(serr)) { 528 sin->sin_family = AF_INET; 529 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 530 serr->addr_offset); 531 sin->sin_port = serr->port; 532 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 533 *addr_len = sizeof(*sin); 534 } 535 536 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 537 sin = &errhdr.offender; 538 memset(sin, 0, sizeof(*sin)); 539 540 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 541 sin->sin_family = AF_INET; 542 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 543 if (inet_sk(sk)->cmsg_flags) 544 ip_cmsg_recv(msg, skb); 545 } 546 547 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 548 549 /* Now we could try to dump offended packet options */ 550 551 msg->msg_flags |= MSG_ERRQUEUE; 552 err = copied; 553 554 consume_skb(skb); 555 out: 556 return err; 557 } 558 559 560 /* 561 * Socket option code for IP. This is the end of the line after any 562 * TCP,UDP etc options on an IP socket. 563 */ 564 static bool setsockopt_needs_rtnl(int optname) 565 { 566 switch (optname) { 567 case IP_ADD_MEMBERSHIP: 568 case IP_ADD_SOURCE_MEMBERSHIP: 569 case IP_BLOCK_SOURCE: 570 case IP_DROP_MEMBERSHIP: 571 case IP_DROP_SOURCE_MEMBERSHIP: 572 case IP_MSFILTER: 573 case IP_UNBLOCK_SOURCE: 574 case MCAST_BLOCK_SOURCE: 575 case MCAST_MSFILTER: 576 case MCAST_JOIN_GROUP: 577 case MCAST_JOIN_SOURCE_GROUP: 578 case MCAST_LEAVE_GROUP: 579 case MCAST_LEAVE_SOURCE_GROUP: 580 case MCAST_UNBLOCK_SOURCE: 581 return true; 582 } 583 return false; 584 } 585 586 static int do_ip_setsockopt(struct sock *sk, int level, 587 int optname, char __user *optval, unsigned int optlen) 588 { 589 struct inet_sock *inet = inet_sk(sk); 590 struct net *net = sock_net(sk); 591 int val = 0, err; 592 bool needs_rtnl = setsockopt_needs_rtnl(optname); 593 594 switch (optname) { 595 case IP_PKTINFO: 596 case IP_RECVTTL: 597 case IP_RECVOPTS: 598 case IP_RECVTOS: 599 case IP_RETOPTS: 600 case IP_TOS: 601 case IP_TTL: 602 case IP_HDRINCL: 603 case IP_MTU_DISCOVER: 604 case IP_RECVERR: 605 case IP_ROUTER_ALERT: 606 case IP_FREEBIND: 607 case IP_PASSSEC: 608 case IP_TRANSPARENT: 609 case IP_MINTTL: 610 case IP_NODEFRAG: 611 case IP_BIND_ADDRESS_NO_PORT: 612 case IP_UNICAST_IF: 613 case IP_MULTICAST_TTL: 614 case IP_MULTICAST_ALL: 615 case IP_MULTICAST_LOOP: 616 case IP_RECVORIGDSTADDR: 617 case IP_CHECKSUM: 618 case IP_RECVFRAGSIZE: 619 if (optlen >= sizeof(int)) { 620 if (get_user(val, (int __user *) optval)) 621 return -EFAULT; 622 } else if (optlen >= sizeof(char)) { 623 unsigned char ucval; 624 625 if (get_user(ucval, (unsigned char __user *) optval)) 626 return -EFAULT; 627 val = (int) ucval; 628 } 629 } 630 631 /* If optlen==0, it is equivalent to val == 0 */ 632 633 if (optname == IP_ROUTER_ALERT) 634 return ip_ra_control(sk, val ? 1 : 0, NULL); 635 if (ip_mroute_opt(optname)) 636 return ip_mroute_setsockopt(sk, optname, optval, optlen); 637 638 err = 0; 639 if (needs_rtnl) 640 rtnl_lock(); 641 lock_sock(sk); 642 643 switch (optname) { 644 case IP_OPTIONS: 645 { 646 struct ip_options_rcu *old, *opt = NULL; 647 648 if (optlen > 40) 649 goto e_inval; 650 err = ip_options_get_from_user(sock_net(sk), &opt, 651 optval, optlen); 652 if (err) 653 break; 654 old = rcu_dereference_protected(inet->inet_opt, 655 lockdep_sock_is_held(sk)); 656 if (inet->is_icsk) { 657 struct inet_connection_sock *icsk = inet_csk(sk); 658 #if IS_ENABLED(CONFIG_IPV6) 659 if (sk->sk_family == PF_INET || 660 (!((1 << sk->sk_state) & 661 (TCPF_LISTEN | TCPF_CLOSE)) && 662 inet->inet_daddr != LOOPBACK4_IPV6)) { 663 #endif 664 if (old) 665 icsk->icsk_ext_hdr_len -= old->opt.optlen; 666 if (opt) 667 icsk->icsk_ext_hdr_len += opt->opt.optlen; 668 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 669 #if IS_ENABLED(CONFIG_IPV6) 670 } 671 #endif 672 } 673 rcu_assign_pointer(inet->inet_opt, opt); 674 if (old) 675 kfree_rcu(old, rcu); 676 break; 677 } 678 case IP_PKTINFO: 679 if (val) 680 inet->cmsg_flags |= IP_CMSG_PKTINFO; 681 else 682 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 683 break; 684 case IP_RECVTTL: 685 if (val) 686 inet->cmsg_flags |= IP_CMSG_TTL; 687 else 688 inet->cmsg_flags &= ~IP_CMSG_TTL; 689 break; 690 case IP_RECVTOS: 691 if (val) 692 inet->cmsg_flags |= IP_CMSG_TOS; 693 else 694 inet->cmsg_flags &= ~IP_CMSG_TOS; 695 break; 696 case IP_RECVOPTS: 697 if (val) 698 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 699 else 700 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 701 break; 702 case IP_RETOPTS: 703 if (val) 704 inet->cmsg_flags |= IP_CMSG_RETOPTS; 705 else 706 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 707 break; 708 case IP_PASSSEC: 709 if (val) 710 inet->cmsg_flags |= IP_CMSG_PASSSEC; 711 else 712 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 713 break; 714 case IP_RECVORIGDSTADDR: 715 if (val) 716 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 717 else 718 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 719 break; 720 case IP_CHECKSUM: 721 if (val) { 722 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 723 inet_inc_convert_csum(sk); 724 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 725 } 726 } else { 727 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 728 inet_dec_convert_csum(sk); 729 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 730 } 731 } 732 break; 733 case IP_RECVFRAGSIZE: 734 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 735 goto e_inval; 736 if (val) 737 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 738 else 739 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 740 break; 741 case IP_TOS: /* This sets both TOS and Precedence */ 742 if (sk->sk_type == SOCK_STREAM) { 743 val &= ~INET_ECN_MASK; 744 val |= inet->tos & INET_ECN_MASK; 745 } 746 if (inet->tos != val) { 747 inet->tos = val; 748 sk->sk_priority = rt_tos2priority(val); 749 sk_dst_reset(sk); 750 } 751 break; 752 case IP_TTL: 753 if (optlen < 1) 754 goto e_inval; 755 if (val != -1 && (val < 1 || val > 255)) 756 goto e_inval; 757 inet->uc_ttl = val; 758 break; 759 case IP_HDRINCL: 760 if (sk->sk_type != SOCK_RAW) { 761 err = -ENOPROTOOPT; 762 break; 763 } 764 inet->hdrincl = val ? 1 : 0; 765 break; 766 case IP_NODEFRAG: 767 if (sk->sk_type != SOCK_RAW) { 768 err = -ENOPROTOOPT; 769 break; 770 } 771 inet->nodefrag = val ? 1 : 0; 772 break; 773 case IP_BIND_ADDRESS_NO_PORT: 774 inet->bind_address_no_port = val ? 1 : 0; 775 break; 776 case IP_MTU_DISCOVER: 777 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 778 goto e_inval; 779 inet->pmtudisc = val; 780 break; 781 case IP_RECVERR: 782 inet->recverr = !!val; 783 if (!val) 784 skb_queue_purge(&sk->sk_error_queue); 785 break; 786 case IP_MULTICAST_TTL: 787 if (sk->sk_type == SOCK_STREAM) 788 goto e_inval; 789 if (optlen < 1) 790 goto e_inval; 791 if (val == -1) 792 val = 1; 793 if (val < 0 || val > 255) 794 goto e_inval; 795 inet->mc_ttl = val; 796 break; 797 case IP_MULTICAST_LOOP: 798 if (optlen < 1) 799 goto e_inval; 800 inet->mc_loop = !!val; 801 break; 802 case IP_UNICAST_IF: 803 { 804 struct net_device *dev = NULL; 805 int ifindex; 806 int midx; 807 808 if (optlen != sizeof(int)) 809 goto e_inval; 810 811 ifindex = (__force int)ntohl((__force __be32)val); 812 if (ifindex == 0) { 813 inet->uc_index = 0; 814 err = 0; 815 break; 816 } 817 818 dev = dev_get_by_index(sock_net(sk), ifindex); 819 err = -EADDRNOTAVAIL; 820 if (!dev) 821 break; 822 823 midx = l3mdev_master_ifindex(dev); 824 dev_put(dev); 825 826 err = -EINVAL; 827 if (sk->sk_bound_dev_if && 828 (!midx || midx != sk->sk_bound_dev_if)) 829 break; 830 831 inet->uc_index = ifindex; 832 err = 0; 833 break; 834 } 835 case IP_MULTICAST_IF: 836 { 837 struct ip_mreqn mreq; 838 struct net_device *dev = NULL; 839 int midx; 840 841 if (sk->sk_type == SOCK_STREAM) 842 goto e_inval; 843 /* 844 * Check the arguments are allowable 845 */ 846 847 if (optlen < sizeof(struct in_addr)) 848 goto e_inval; 849 850 err = -EFAULT; 851 if (optlen >= sizeof(struct ip_mreqn)) { 852 if (copy_from_user(&mreq, optval, sizeof(mreq))) 853 break; 854 } else { 855 memset(&mreq, 0, sizeof(mreq)); 856 if (optlen >= sizeof(struct ip_mreq)) { 857 if (copy_from_user(&mreq, optval, 858 sizeof(struct ip_mreq))) 859 break; 860 } else if (optlen >= sizeof(struct in_addr)) { 861 if (copy_from_user(&mreq.imr_address, optval, 862 sizeof(struct in_addr))) 863 break; 864 } 865 } 866 867 if (!mreq.imr_ifindex) { 868 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 869 inet->mc_index = 0; 870 inet->mc_addr = 0; 871 err = 0; 872 break; 873 } 874 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 875 if (dev) 876 mreq.imr_ifindex = dev->ifindex; 877 } else 878 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 879 880 881 err = -EADDRNOTAVAIL; 882 if (!dev) 883 break; 884 885 midx = l3mdev_master_ifindex(dev); 886 887 dev_put(dev); 888 889 err = -EINVAL; 890 if (sk->sk_bound_dev_if && 891 mreq.imr_ifindex != sk->sk_bound_dev_if && 892 (!midx || midx != sk->sk_bound_dev_if)) 893 break; 894 895 inet->mc_index = mreq.imr_ifindex; 896 inet->mc_addr = mreq.imr_address.s_addr; 897 err = 0; 898 break; 899 } 900 901 case IP_ADD_MEMBERSHIP: 902 case IP_DROP_MEMBERSHIP: 903 { 904 struct ip_mreqn mreq; 905 906 err = -EPROTO; 907 if (inet_sk(sk)->is_icsk) 908 break; 909 910 if (optlen < sizeof(struct ip_mreq)) 911 goto e_inval; 912 err = -EFAULT; 913 if (optlen >= sizeof(struct ip_mreqn)) { 914 if (copy_from_user(&mreq, optval, sizeof(mreq))) 915 break; 916 } else { 917 memset(&mreq, 0, sizeof(mreq)); 918 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 919 break; 920 } 921 922 if (optname == IP_ADD_MEMBERSHIP) 923 err = ip_mc_join_group(sk, &mreq); 924 else 925 err = ip_mc_leave_group(sk, &mreq); 926 break; 927 } 928 case IP_MSFILTER: 929 { 930 struct ip_msfilter *msf; 931 932 if (optlen < IP_MSFILTER_SIZE(0)) 933 goto e_inval; 934 if (optlen > sysctl_optmem_max) { 935 err = -ENOBUFS; 936 break; 937 } 938 msf = memdup_user(optval, optlen); 939 if (IS_ERR(msf)) { 940 err = PTR_ERR(msf); 941 break; 942 } 943 /* numsrc >= (1G-4) overflow in 32 bits */ 944 if (msf->imsf_numsrc >= 0x3ffffffcU || 945 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 946 kfree(msf); 947 err = -ENOBUFS; 948 break; 949 } 950 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 951 kfree(msf); 952 err = -EINVAL; 953 break; 954 } 955 err = ip_mc_msfilter(sk, msf, 0); 956 kfree(msf); 957 break; 958 } 959 case IP_BLOCK_SOURCE: 960 case IP_UNBLOCK_SOURCE: 961 case IP_ADD_SOURCE_MEMBERSHIP: 962 case IP_DROP_SOURCE_MEMBERSHIP: 963 { 964 struct ip_mreq_source mreqs; 965 int omode, add; 966 967 if (optlen != sizeof(struct ip_mreq_source)) 968 goto e_inval; 969 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 970 err = -EFAULT; 971 break; 972 } 973 if (optname == IP_BLOCK_SOURCE) { 974 omode = MCAST_EXCLUDE; 975 add = 1; 976 } else if (optname == IP_UNBLOCK_SOURCE) { 977 omode = MCAST_EXCLUDE; 978 add = 0; 979 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 980 struct ip_mreqn mreq; 981 982 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 983 mreq.imr_address.s_addr = mreqs.imr_interface; 984 mreq.imr_ifindex = 0; 985 err = ip_mc_join_group(sk, &mreq); 986 if (err && err != -EADDRINUSE) 987 break; 988 omode = MCAST_INCLUDE; 989 add = 1; 990 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 991 omode = MCAST_INCLUDE; 992 add = 0; 993 } 994 err = ip_mc_source(add, omode, sk, &mreqs, 0); 995 break; 996 } 997 case MCAST_JOIN_GROUP: 998 case MCAST_LEAVE_GROUP: 999 { 1000 struct group_req greq; 1001 struct sockaddr_in *psin; 1002 struct ip_mreqn mreq; 1003 1004 if (optlen < sizeof(struct group_req)) 1005 goto e_inval; 1006 err = -EFAULT; 1007 if (copy_from_user(&greq, optval, sizeof(greq))) 1008 break; 1009 psin = (struct sockaddr_in *)&greq.gr_group; 1010 if (psin->sin_family != AF_INET) 1011 goto e_inval; 1012 memset(&mreq, 0, sizeof(mreq)); 1013 mreq.imr_multiaddr = psin->sin_addr; 1014 mreq.imr_ifindex = greq.gr_interface; 1015 1016 if (optname == MCAST_JOIN_GROUP) 1017 err = ip_mc_join_group(sk, &mreq); 1018 else 1019 err = ip_mc_leave_group(sk, &mreq); 1020 break; 1021 } 1022 case MCAST_JOIN_SOURCE_GROUP: 1023 case MCAST_LEAVE_SOURCE_GROUP: 1024 case MCAST_BLOCK_SOURCE: 1025 case MCAST_UNBLOCK_SOURCE: 1026 { 1027 struct group_source_req greqs; 1028 struct ip_mreq_source mreqs; 1029 struct sockaddr_in *psin; 1030 int omode, add; 1031 1032 if (optlen != sizeof(struct group_source_req)) 1033 goto e_inval; 1034 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1035 err = -EFAULT; 1036 break; 1037 } 1038 if (greqs.gsr_group.ss_family != AF_INET || 1039 greqs.gsr_source.ss_family != AF_INET) { 1040 err = -EADDRNOTAVAIL; 1041 break; 1042 } 1043 psin = (struct sockaddr_in *)&greqs.gsr_group; 1044 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1045 psin = (struct sockaddr_in *)&greqs.gsr_source; 1046 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1047 mreqs.imr_interface = 0; /* use index for mc_source */ 1048 1049 if (optname == MCAST_BLOCK_SOURCE) { 1050 omode = MCAST_EXCLUDE; 1051 add = 1; 1052 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1053 omode = MCAST_EXCLUDE; 1054 add = 0; 1055 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1056 struct ip_mreqn mreq; 1057 1058 psin = (struct sockaddr_in *)&greqs.gsr_group; 1059 mreq.imr_multiaddr = psin->sin_addr; 1060 mreq.imr_address.s_addr = 0; 1061 mreq.imr_ifindex = greqs.gsr_interface; 1062 err = ip_mc_join_group(sk, &mreq); 1063 if (err && err != -EADDRINUSE) 1064 break; 1065 greqs.gsr_interface = mreq.imr_ifindex; 1066 omode = MCAST_INCLUDE; 1067 add = 1; 1068 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1069 omode = MCAST_INCLUDE; 1070 add = 0; 1071 } 1072 err = ip_mc_source(add, omode, sk, &mreqs, 1073 greqs.gsr_interface); 1074 break; 1075 } 1076 case MCAST_MSFILTER: 1077 { 1078 struct sockaddr_in *psin; 1079 struct ip_msfilter *msf = NULL; 1080 struct group_filter *gsf = NULL; 1081 int msize, i, ifindex; 1082 1083 if (optlen < GROUP_FILTER_SIZE(0)) 1084 goto e_inval; 1085 if (optlen > sysctl_optmem_max) { 1086 err = -ENOBUFS; 1087 break; 1088 } 1089 gsf = memdup_user(optval, optlen); 1090 if (IS_ERR(gsf)) { 1091 err = PTR_ERR(gsf); 1092 break; 1093 } 1094 1095 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1096 if (gsf->gf_numsrc >= 0x1ffffff || 1097 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1098 err = -ENOBUFS; 1099 goto mc_msf_out; 1100 } 1101 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1102 err = -EINVAL; 1103 goto mc_msf_out; 1104 } 1105 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1106 msf = kmalloc(msize, GFP_KERNEL); 1107 if (!msf) { 1108 err = -ENOBUFS; 1109 goto mc_msf_out; 1110 } 1111 ifindex = gsf->gf_interface; 1112 psin = (struct sockaddr_in *)&gsf->gf_group; 1113 if (psin->sin_family != AF_INET) { 1114 err = -EADDRNOTAVAIL; 1115 goto mc_msf_out; 1116 } 1117 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1118 msf->imsf_interface = 0; 1119 msf->imsf_fmode = gsf->gf_fmode; 1120 msf->imsf_numsrc = gsf->gf_numsrc; 1121 err = -EADDRNOTAVAIL; 1122 for (i = 0; i < gsf->gf_numsrc; ++i) { 1123 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1124 1125 if (psin->sin_family != AF_INET) 1126 goto mc_msf_out; 1127 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1128 } 1129 kfree(gsf); 1130 gsf = NULL; 1131 1132 err = ip_mc_msfilter(sk, msf, ifindex); 1133 mc_msf_out: 1134 kfree(msf); 1135 kfree(gsf); 1136 break; 1137 } 1138 case IP_MULTICAST_ALL: 1139 if (optlen < 1) 1140 goto e_inval; 1141 if (val != 0 && val != 1) 1142 goto e_inval; 1143 inet->mc_all = val; 1144 break; 1145 1146 case IP_FREEBIND: 1147 if (optlen < 1) 1148 goto e_inval; 1149 inet->freebind = !!val; 1150 break; 1151 1152 case IP_IPSEC_POLICY: 1153 case IP_XFRM_POLICY: 1154 err = -EPERM; 1155 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1156 break; 1157 err = xfrm_user_policy(sk, optname, optval, optlen); 1158 break; 1159 1160 case IP_TRANSPARENT: 1161 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1162 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1163 err = -EPERM; 1164 break; 1165 } 1166 if (optlen < 1) 1167 goto e_inval; 1168 inet->transparent = !!val; 1169 break; 1170 1171 case IP_MINTTL: 1172 if (optlen < 1) 1173 goto e_inval; 1174 if (val < 0 || val > 255) 1175 goto e_inval; 1176 inet->min_ttl = val; 1177 break; 1178 1179 default: 1180 err = -ENOPROTOOPT; 1181 break; 1182 } 1183 release_sock(sk); 1184 if (needs_rtnl) 1185 rtnl_unlock(); 1186 return err; 1187 1188 e_inval: 1189 release_sock(sk); 1190 if (needs_rtnl) 1191 rtnl_unlock(); 1192 return -EINVAL; 1193 } 1194 1195 /** 1196 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1197 * @sk: socket 1198 * @skb: buffer 1199 * 1200 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1201 * destination in skb->cb[] before dst drop. 1202 * This way, receiver doesn't make cache line misses to read rtable. 1203 */ 1204 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1205 { 1206 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1207 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1208 ipv6_sk_rxinfo(sk); 1209 1210 if (prepare && skb_rtable(skb)) { 1211 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1212 * which has interface index (iif) as the first member of the 1213 * underlying inet{6}_skb_parm struct. This code then overlays 1214 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1215 * element so the iif is picked up from the prior IPCB. If iif 1216 * is the loopback interface, then return the sending interface 1217 * (e.g., process binds socket to eth0 for Tx which is 1218 * redirected to loopback in the rtable/dst). 1219 */ 1220 struct rtable *rt = skb_rtable(skb); 1221 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1222 1223 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1224 pktinfo->ipi_ifindex = inet_iif(skb); 1225 else if (l3slave && rt && rt->rt_iif) 1226 pktinfo->ipi_ifindex = rt->rt_iif; 1227 1228 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1229 } else { 1230 pktinfo->ipi_ifindex = 0; 1231 pktinfo->ipi_spec_dst.s_addr = 0; 1232 } 1233 skb_dst_drop(skb); 1234 } 1235 1236 int ip_setsockopt(struct sock *sk, int level, 1237 int optname, char __user *optval, unsigned int optlen) 1238 { 1239 int err; 1240 1241 if (level != SOL_IP) 1242 return -ENOPROTOOPT; 1243 1244 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1245 #ifdef CONFIG_NETFILTER 1246 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1247 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1248 optname != IP_IPSEC_POLICY && 1249 optname != IP_XFRM_POLICY && 1250 !ip_mroute_opt(optname)) 1251 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1252 #endif 1253 return err; 1254 } 1255 EXPORT_SYMBOL(ip_setsockopt); 1256 1257 #ifdef CONFIG_COMPAT 1258 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1259 char __user *optval, unsigned int optlen) 1260 { 1261 int err; 1262 1263 if (level != SOL_IP) 1264 return -ENOPROTOOPT; 1265 1266 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1267 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1268 ip_setsockopt); 1269 1270 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1271 #ifdef CONFIG_NETFILTER 1272 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1273 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1274 optname != IP_IPSEC_POLICY && 1275 optname != IP_XFRM_POLICY && 1276 !ip_mroute_opt(optname)) 1277 err = compat_nf_setsockopt(sk, PF_INET, optname, optval, 1278 optlen); 1279 #endif 1280 return err; 1281 } 1282 EXPORT_SYMBOL(compat_ip_setsockopt); 1283 #endif 1284 1285 /* 1286 * Get the options. Note for future reference. The GET of IP options gets 1287 * the _received_ ones. The set sets the _sent_ ones. 1288 */ 1289 1290 static bool getsockopt_needs_rtnl(int optname) 1291 { 1292 switch (optname) { 1293 case IP_MSFILTER: 1294 case MCAST_MSFILTER: 1295 return true; 1296 } 1297 return false; 1298 } 1299 1300 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1301 char __user *optval, int __user *optlen, unsigned int flags) 1302 { 1303 struct inet_sock *inet = inet_sk(sk); 1304 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1305 int val, err = 0; 1306 int len; 1307 1308 if (level != SOL_IP) 1309 return -EOPNOTSUPP; 1310 1311 if (ip_mroute_opt(optname)) 1312 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1313 1314 if (get_user(len, optlen)) 1315 return -EFAULT; 1316 if (len < 0) 1317 return -EINVAL; 1318 1319 if (needs_rtnl) 1320 rtnl_lock(); 1321 lock_sock(sk); 1322 1323 switch (optname) { 1324 case IP_OPTIONS: 1325 { 1326 unsigned char optbuf[sizeof(struct ip_options)+40]; 1327 struct ip_options *opt = (struct ip_options *)optbuf; 1328 struct ip_options_rcu *inet_opt; 1329 1330 inet_opt = rcu_dereference_protected(inet->inet_opt, 1331 lockdep_sock_is_held(sk)); 1332 opt->optlen = 0; 1333 if (inet_opt) 1334 memcpy(optbuf, &inet_opt->opt, 1335 sizeof(struct ip_options) + 1336 inet_opt->opt.optlen); 1337 release_sock(sk); 1338 1339 if (opt->optlen == 0) 1340 return put_user(0, optlen); 1341 1342 ip_options_undo(opt); 1343 1344 len = min_t(unsigned int, len, opt->optlen); 1345 if (put_user(len, optlen)) 1346 return -EFAULT; 1347 if (copy_to_user(optval, opt->__data, len)) 1348 return -EFAULT; 1349 return 0; 1350 } 1351 case IP_PKTINFO: 1352 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1353 break; 1354 case IP_RECVTTL: 1355 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1356 break; 1357 case IP_RECVTOS: 1358 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1359 break; 1360 case IP_RECVOPTS: 1361 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1362 break; 1363 case IP_RETOPTS: 1364 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1365 break; 1366 case IP_PASSSEC: 1367 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1368 break; 1369 case IP_RECVORIGDSTADDR: 1370 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1371 break; 1372 case IP_CHECKSUM: 1373 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1374 break; 1375 case IP_RECVFRAGSIZE: 1376 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1377 break; 1378 case IP_TOS: 1379 val = inet->tos; 1380 break; 1381 case IP_TTL: 1382 { 1383 struct net *net = sock_net(sk); 1384 val = (inet->uc_ttl == -1 ? 1385 net->ipv4.sysctl_ip_default_ttl : 1386 inet->uc_ttl); 1387 break; 1388 } 1389 case IP_HDRINCL: 1390 val = inet->hdrincl; 1391 break; 1392 case IP_NODEFRAG: 1393 val = inet->nodefrag; 1394 break; 1395 case IP_BIND_ADDRESS_NO_PORT: 1396 val = inet->bind_address_no_port; 1397 break; 1398 case IP_MTU_DISCOVER: 1399 val = inet->pmtudisc; 1400 break; 1401 case IP_MTU: 1402 { 1403 struct dst_entry *dst; 1404 val = 0; 1405 dst = sk_dst_get(sk); 1406 if (dst) { 1407 val = dst_mtu(dst); 1408 dst_release(dst); 1409 } 1410 if (!val) { 1411 release_sock(sk); 1412 return -ENOTCONN; 1413 } 1414 break; 1415 } 1416 case IP_RECVERR: 1417 val = inet->recverr; 1418 break; 1419 case IP_MULTICAST_TTL: 1420 val = inet->mc_ttl; 1421 break; 1422 case IP_MULTICAST_LOOP: 1423 val = inet->mc_loop; 1424 break; 1425 case IP_UNICAST_IF: 1426 val = (__force int)htonl((__u32) inet->uc_index); 1427 break; 1428 case IP_MULTICAST_IF: 1429 { 1430 struct in_addr addr; 1431 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1432 addr.s_addr = inet->mc_addr; 1433 release_sock(sk); 1434 1435 if (put_user(len, optlen)) 1436 return -EFAULT; 1437 if (copy_to_user(optval, &addr, len)) 1438 return -EFAULT; 1439 return 0; 1440 } 1441 case IP_MSFILTER: 1442 { 1443 struct ip_msfilter msf; 1444 1445 if (len < IP_MSFILTER_SIZE(0)) { 1446 err = -EINVAL; 1447 goto out; 1448 } 1449 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1450 err = -EFAULT; 1451 goto out; 1452 } 1453 err = ip_mc_msfget(sk, &msf, 1454 (struct ip_msfilter __user *)optval, optlen); 1455 goto out; 1456 } 1457 case MCAST_MSFILTER: 1458 { 1459 struct group_filter gsf; 1460 1461 if (len < GROUP_FILTER_SIZE(0)) { 1462 err = -EINVAL; 1463 goto out; 1464 } 1465 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1466 err = -EFAULT; 1467 goto out; 1468 } 1469 err = ip_mc_gsfget(sk, &gsf, 1470 (struct group_filter __user *)optval, 1471 optlen); 1472 goto out; 1473 } 1474 case IP_MULTICAST_ALL: 1475 val = inet->mc_all; 1476 break; 1477 case IP_PKTOPTIONS: 1478 { 1479 struct msghdr msg; 1480 1481 release_sock(sk); 1482 1483 if (sk->sk_type != SOCK_STREAM) 1484 return -ENOPROTOOPT; 1485 1486 msg.msg_control = (__force void *) optval; 1487 msg.msg_controllen = len; 1488 msg.msg_flags = flags; 1489 1490 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1491 struct in_pktinfo info; 1492 1493 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1494 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1495 info.ipi_ifindex = inet->mc_index; 1496 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1497 } 1498 if (inet->cmsg_flags & IP_CMSG_TTL) { 1499 int hlim = inet->mc_ttl; 1500 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1501 } 1502 if (inet->cmsg_flags & IP_CMSG_TOS) { 1503 int tos = inet->rcv_tos; 1504 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1505 } 1506 len -= msg.msg_controllen; 1507 return put_user(len, optlen); 1508 } 1509 case IP_FREEBIND: 1510 val = inet->freebind; 1511 break; 1512 case IP_TRANSPARENT: 1513 val = inet->transparent; 1514 break; 1515 case IP_MINTTL: 1516 val = inet->min_ttl; 1517 break; 1518 default: 1519 release_sock(sk); 1520 return -ENOPROTOOPT; 1521 } 1522 release_sock(sk); 1523 1524 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1525 unsigned char ucval = (unsigned char)val; 1526 len = 1; 1527 if (put_user(len, optlen)) 1528 return -EFAULT; 1529 if (copy_to_user(optval, &ucval, 1)) 1530 return -EFAULT; 1531 } else { 1532 len = min_t(unsigned int, sizeof(int), len); 1533 if (put_user(len, optlen)) 1534 return -EFAULT; 1535 if (copy_to_user(optval, &val, len)) 1536 return -EFAULT; 1537 } 1538 return 0; 1539 1540 out: 1541 release_sock(sk); 1542 if (needs_rtnl) 1543 rtnl_unlock(); 1544 return err; 1545 } 1546 1547 int ip_getsockopt(struct sock *sk, int level, 1548 int optname, char __user *optval, int __user *optlen) 1549 { 1550 int err; 1551 1552 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1553 #ifdef CONFIG_NETFILTER 1554 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1555 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1556 !ip_mroute_opt(optname)) { 1557 int len; 1558 1559 if (get_user(len, optlen)) 1560 return -EFAULT; 1561 1562 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1563 if (err >= 0) 1564 err = put_user(len, optlen); 1565 return err; 1566 } 1567 #endif 1568 return err; 1569 } 1570 EXPORT_SYMBOL(ip_getsockopt); 1571 1572 #ifdef CONFIG_COMPAT 1573 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1574 char __user *optval, int __user *optlen) 1575 { 1576 int err; 1577 1578 if (optname == MCAST_MSFILTER) 1579 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1580 ip_getsockopt); 1581 1582 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1583 MSG_CMSG_COMPAT); 1584 1585 #ifdef CONFIG_NETFILTER 1586 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1587 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1588 !ip_mroute_opt(optname)) { 1589 int len; 1590 1591 if (get_user(len, optlen)) 1592 return -EFAULT; 1593 1594 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1595 if (err >= 0) 1596 err = put_user(len, optlen); 1597 return err; 1598 } 1599 #endif 1600 return err; 1601 } 1602 EXPORT_SYMBOL(compat_ip_getsockopt); 1603 #endif 1604