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 ipc->oif = src_info->ipi6_ifindex; 262 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 263 continue; 264 } 265 #endif 266 if (cmsg->cmsg_level == SOL_SOCKET) { 267 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 268 if (err) 269 return err; 270 continue; 271 } 272 273 if (cmsg->cmsg_level != SOL_IP) 274 continue; 275 switch (cmsg->cmsg_type) { 276 case IP_RETOPTS: 277 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 278 279 /* Our caller is responsible for freeing ipc->opt */ 280 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 281 err < 40 ? err : 40); 282 if (err) 283 return err; 284 break; 285 case IP_PKTINFO: 286 { 287 struct in_pktinfo *info; 288 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 289 return -EINVAL; 290 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 291 ipc->oif = info->ipi_ifindex; 292 ipc->addr = info->ipi_spec_dst.s_addr; 293 break; 294 } 295 case IP_TTL: 296 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 297 return -EINVAL; 298 val = *(int *)CMSG_DATA(cmsg); 299 if (val < 1 || val > 255) 300 return -EINVAL; 301 ipc->ttl = val; 302 break; 303 case IP_TOS: 304 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 305 val = *(int *)CMSG_DATA(cmsg); 306 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 307 val = *(u8 *)CMSG_DATA(cmsg); 308 else 309 return -EINVAL; 310 if (val < 0 || val > 255) 311 return -EINVAL; 312 ipc->tos = val; 313 ipc->priority = rt_tos2priority(ipc->tos); 314 break; 315 316 default: 317 return -EINVAL; 318 } 319 } 320 return 0; 321 } 322 323 324 /* Special input handler for packets caught by router alert option. 325 They are selected only by protocol field, and then processed likely 326 local ones; but only if someone wants them! Otherwise, router 327 not running rsvpd will kill RSVP. 328 329 It is user level problem, what it will make with them. 330 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 331 but receiver should be enough clever f.e. to forward mtrace requests, 332 sent to multicast group to reach destination designated router. 333 */ 334 struct ip_ra_chain __rcu *ip_ra_chain; 335 336 337 static void ip_ra_destroy_rcu(struct rcu_head *head) 338 { 339 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 340 341 sock_put(ra->saved_sk); 342 kfree(ra); 343 } 344 345 int ip_ra_control(struct sock *sk, unsigned char on, 346 void (*destructor)(struct sock *)) 347 { 348 struct ip_ra_chain *ra, *new_ra; 349 struct ip_ra_chain __rcu **rap; 350 351 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 352 return -EINVAL; 353 354 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 355 356 for (rap = &ip_ra_chain; 357 (ra = rtnl_dereference(*rap)) != NULL; 358 rap = &ra->next) { 359 if (ra->sk == sk) { 360 if (on) { 361 kfree(new_ra); 362 return -EADDRINUSE; 363 } 364 /* dont let ip_call_ra_chain() use sk again */ 365 ra->sk = NULL; 366 RCU_INIT_POINTER(*rap, ra->next); 367 368 if (ra->destructor) 369 ra->destructor(sk); 370 /* 371 * Delay sock_put(sk) and kfree(ra) after one rcu grace 372 * period. This guarantee ip_call_ra_chain() dont need 373 * to mess with socket refcounts. 374 */ 375 ra->saved_sk = sk; 376 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 377 return 0; 378 } 379 } 380 if (!new_ra) 381 return -ENOBUFS; 382 new_ra->sk = sk; 383 new_ra->destructor = destructor; 384 385 RCU_INIT_POINTER(new_ra->next, ra); 386 rcu_assign_pointer(*rap, new_ra); 387 sock_hold(sk); 388 389 return 0; 390 } 391 392 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 393 __be16 port, u32 info, u8 *payload) 394 { 395 struct sock_exterr_skb *serr; 396 397 skb = skb_clone(skb, GFP_ATOMIC); 398 if (!skb) 399 return; 400 401 serr = SKB_EXT_ERR(skb); 402 serr->ee.ee_errno = err; 403 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 404 serr->ee.ee_type = icmp_hdr(skb)->type; 405 serr->ee.ee_code = icmp_hdr(skb)->code; 406 serr->ee.ee_pad = 0; 407 serr->ee.ee_info = info; 408 serr->ee.ee_data = 0; 409 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 410 skb_network_header(skb); 411 serr->port = port; 412 413 if (skb_pull(skb, payload - skb->data)) { 414 skb_reset_transport_header(skb); 415 if (sock_queue_err_skb(sk, skb) == 0) 416 return; 417 } 418 kfree_skb(skb); 419 } 420 421 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 422 { 423 struct inet_sock *inet = inet_sk(sk); 424 struct sock_exterr_skb *serr; 425 struct iphdr *iph; 426 struct sk_buff *skb; 427 428 if (!inet->recverr) 429 return; 430 431 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 432 if (!skb) 433 return; 434 435 skb_put(skb, sizeof(struct iphdr)); 436 skb_reset_network_header(skb); 437 iph = ip_hdr(skb); 438 iph->daddr = daddr; 439 440 serr = SKB_EXT_ERR(skb); 441 serr->ee.ee_errno = err; 442 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 443 serr->ee.ee_type = 0; 444 serr->ee.ee_code = 0; 445 serr->ee.ee_pad = 0; 446 serr->ee.ee_info = info; 447 serr->ee.ee_data = 0; 448 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 449 serr->port = port; 450 451 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 452 skb_reset_transport_header(skb); 453 454 if (sock_queue_err_skb(sk, skb)) 455 kfree_skb(skb); 456 } 457 458 /* For some errors we have valid addr_offset even with zero payload and 459 * zero port. Also, addr_offset should be supported if port is set. 460 */ 461 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 462 { 463 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 464 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 465 } 466 467 /* IPv4 supports cmsg on all imcp errors and some timestamps 468 * 469 * Timestamp code paths do not initialize the fields expected by cmsg: 470 * the PKTINFO fields in skb->cb[]. Fill those in here. 471 */ 472 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 473 struct sk_buff *skb, 474 int ee_origin) 475 { 476 struct in_pktinfo *info; 477 478 if (ee_origin == SO_EE_ORIGIN_ICMP) 479 return true; 480 481 if (ee_origin == SO_EE_ORIGIN_LOCAL) 482 return false; 483 484 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 485 * timestamp with egress dev. Not possible for packets without iif 486 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 487 */ 488 info = PKTINFO_SKB_CB(skb); 489 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 490 !info->ipi_ifindex) 491 return false; 492 493 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 494 return true; 495 } 496 497 /* 498 * Handle MSG_ERRQUEUE 499 */ 500 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 501 { 502 struct sock_exterr_skb *serr; 503 struct sk_buff *skb; 504 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 505 struct { 506 struct sock_extended_err ee; 507 struct sockaddr_in offender; 508 } errhdr; 509 int err; 510 int copied; 511 512 WARN_ON_ONCE(sk->sk_family == AF_INET6); 513 514 err = -EAGAIN; 515 skb = sock_dequeue_err_skb(sk); 516 if (!skb) 517 goto out; 518 519 copied = skb->len; 520 if (copied > len) { 521 msg->msg_flags |= MSG_TRUNC; 522 copied = len; 523 } 524 err = skb_copy_datagram_msg(skb, 0, msg, copied); 525 if (unlikely(err)) { 526 kfree_skb(skb); 527 return err; 528 } 529 sock_recv_timestamp(msg, sk, skb); 530 531 serr = SKB_EXT_ERR(skb); 532 533 if (sin && ipv4_datagram_support_addr(serr)) { 534 sin->sin_family = AF_INET; 535 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 536 serr->addr_offset); 537 sin->sin_port = serr->port; 538 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 539 *addr_len = sizeof(*sin); 540 } 541 542 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 543 sin = &errhdr.offender; 544 memset(sin, 0, sizeof(*sin)); 545 546 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 547 sin->sin_family = AF_INET; 548 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 549 if (inet_sk(sk)->cmsg_flags) 550 ip_cmsg_recv(msg, skb); 551 } 552 553 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 554 555 /* Now we could try to dump offended packet options */ 556 557 msg->msg_flags |= MSG_ERRQUEUE; 558 err = copied; 559 560 consume_skb(skb); 561 out: 562 return err; 563 } 564 565 566 /* 567 * Socket option code for IP. This is the end of the line after any 568 * TCP,UDP etc options on an IP socket. 569 */ 570 static bool setsockopt_needs_rtnl(int optname) 571 { 572 switch (optname) { 573 case IP_ADD_MEMBERSHIP: 574 case IP_ADD_SOURCE_MEMBERSHIP: 575 case IP_BLOCK_SOURCE: 576 case IP_DROP_MEMBERSHIP: 577 case IP_DROP_SOURCE_MEMBERSHIP: 578 case IP_MSFILTER: 579 case IP_UNBLOCK_SOURCE: 580 case MCAST_BLOCK_SOURCE: 581 case MCAST_MSFILTER: 582 case MCAST_JOIN_GROUP: 583 case MCAST_JOIN_SOURCE_GROUP: 584 case MCAST_LEAVE_GROUP: 585 case MCAST_LEAVE_SOURCE_GROUP: 586 case MCAST_UNBLOCK_SOURCE: 587 case IP_ROUTER_ALERT: 588 return true; 589 } 590 return false; 591 } 592 593 static int do_ip_setsockopt(struct sock *sk, int level, 594 int optname, char __user *optval, unsigned int optlen) 595 { 596 struct inet_sock *inet = inet_sk(sk); 597 struct net *net = sock_net(sk); 598 int val = 0, err; 599 bool needs_rtnl = setsockopt_needs_rtnl(optname); 600 601 switch (optname) { 602 case IP_PKTINFO: 603 case IP_RECVTTL: 604 case IP_RECVOPTS: 605 case IP_RECVTOS: 606 case IP_RETOPTS: 607 case IP_TOS: 608 case IP_TTL: 609 case IP_HDRINCL: 610 case IP_MTU_DISCOVER: 611 case IP_RECVERR: 612 case IP_ROUTER_ALERT: 613 case IP_FREEBIND: 614 case IP_PASSSEC: 615 case IP_TRANSPARENT: 616 case IP_MINTTL: 617 case IP_NODEFRAG: 618 case IP_BIND_ADDRESS_NO_PORT: 619 case IP_UNICAST_IF: 620 case IP_MULTICAST_TTL: 621 case IP_MULTICAST_ALL: 622 case IP_MULTICAST_LOOP: 623 case IP_RECVORIGDSTADDR: 624 case IP_CHECKSUM: 625 case IP_RECVFRAGSIZE: 626 if (optlen >= sizeof(int)) { 627 if (get_user(val, (int __user *) optval)) 628 return -EFAULT; 629 } else if (optlen >= sizeof(char)) { 630 unsigned char ucval; 631 632 if (get_user(ucval, (unsigned char __user *) optval)) 633 return -EFAULT; 634 val = (int) ucval; 635 } 636 } 637 638 /* If optlen==0, it is equivalent to val == 0 */ 639 640 if (ip_mroute_opt(optname)) 641 return ip_mroute_setsockopt(sk, optname, optval, optlen); 642 643 err = 0; 644 if (needs_rtnl) 645 rtnl_lock(); 646 lock_sock(sk); 647 648 switch (optname) { 649 case IP_OPTIONS: 650 { 651 struct ip_options_rcu *old, *opt = NULL; 652 653 if (optlen > 40) 654 goto e_inval; 655 err = ip_options_get_from_user(sock_net(sk), &opt, 656 optval, optlen); 657 if (err) 658 break; 659 old = rcu_dereference_protected(inet->inet_opt, 660 lockdep_sock_is_held(sk)); 661 if (inet->is_icsk) { 662 struct inet_connection_sock *icsk = inet_csk(sk); 663 #if IS_ENABLED(CONFIG_IPV6) 664 if (sk->sk_family == PF_INET || 665 (!((1 << sk->sk_state) & 666 (TCPF_LISTEN | TCPF_CLOSE)) && 667 inet->inet_daddr != LOOPBACK4_IPV6)) { 668 #endif 669 if (old) 670 icsk->icsk_ext_hdr_len -= old->opt.optlen; 671 if (opt) 672 icsk->icsk_ext_hdr_len += opt->opt.optlen; 673 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 674 #if IS_ENABLED(CONFIG_IPV6) 675 } 676 #endif 677 } 678 rcu_assign_pointer(inet->inet_opt, opt); 679 if (old) 680 kfree_rcu(old, rcu); 681 break; 682 } 683 case IP_PKTINFO: 684 if (val) 685 inet->cmsg_flags |= IP_CMSG_PKTINFO; 686 else 687 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 688 break; 689 case IP_RECVTTL: 690 if (val) 691 inet->cmsg_flags |= IP_CMSG_TTL; 692 else 693 inet->cmsg_flags &= ~IP_CMSG_TTL; 694 break; 695 case IP_RECVTOS: 696 if (val) 697 inet->cmsg_flags |= IP_CMSG_TOS; 698 else 699 inet->cmsg_flags &= ~IP_CMSG_TOS; 700 break; 701 case IP_RECVOPTS: 702 if (val) 703 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 704 else 705 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 706 break; 707 case IP_RETOPTS: 708 if (val) 709 inet->cmsg_flags |= IP_CMSG_RETOPTS; 710 else 711 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 712 break; 713 case IP_PASSSEC: 714 if (val) 715 inet->cmsg_flags |= IP_CMSG_PASSSEC; 716 else 717 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 718 break; 719 case IP_RECVORIGDSTADDR: 720 if (val) 721 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 722 else 723 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 724 break; 725 case IP_CHECKSUM: 726 if (val) { 727 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 728 inet_inc_convert_csum(sk); 729 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 730 } 731 } else { 732 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 733 inet_dec_convert_csum(sk); 734 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 735 } 736 } 737 break; 738 case IP_RECVFRAGSIZE: 739 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 740 goto e_inval; 741 if (val) 742 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 743 else 744 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 745 break; 746 case IP_TOS: /* This sets both TOS and Precedence */ 747 if (sk->sk_type == SOCK_STREAM) { 748 val &= ~INET_ECN_MASK; 749 val |= inet->tos & INET_ECN_MASK; 750 } 751 if (inet->tos != val) { 752 inet->tos = val; 753 sk->sk_priority = rt_tos2priority(val); 754 sk_dst_reset(sk); 755 } 756 break; 757 case IP_TTL: 758 if (optlen < 1) 759 goto e_inval; 760 if (val != -1 && (val < 1 || val > 255)) 761 goto e_inval; 762 inet->uc_ttl = val; 763 break; 764 case IP_HDRINCL: 765 if (sk->sk_type != SOCK_RAW) { 766 err = -ENOPROTOOPT; 767 break; 768 } 769 inet->hdrincl = val ? 1 : 0; 770 break; 771 case IP_NODEFRAG: 772 if (sk->sk_type != SOCK_RAW) { 773 err = -ENOPROTOOPT; 774 break; 775 } 776 inet->nodefrag = val ? 1 : 0; 777 break; 778 case IP_BIND_ADDRESS_NO_PORT: 779 inet->bind_address_no_port = val ? 1 : 0; 780 break; 781 case IP_MTU_DISCOVER: 782 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 783 goto e_inval; 784 inet->pmtudisc = val; 785 break; 786 case IP_RECVERR: 787 inet->recverr = !!val; 788 if (!val) 789 skb_queue_purge(&sk->sk_error_queue); 790 break; 791 case IP_MULTICAST_TTL: 792 if (sk->sk_type == SOCK_STREAM) 793 goto e_inval; 794 if (optlen < 1) 795 goto e_inval; 796 if (val == -1) 797 val = 1; 798 if (val < 0 || val > 255) 799 goto e_inval; 800 inet->mc_ttl = val; 801 break; 802 case IP_MULTICAST_LOOP: 803 if (optlen < 1) 804 goto e_inval; 805 inet->mc_loop = !!val; 806 break; 807 case IP_UNICAST_IF: 808 { 809 struct net_device *dev = NULL; 810 int ifindex; 811 812 if (optlen != sizeof(int)) 813 goto e_inval; 814 815 ifindex = (__force int)ntohl((__force __be32)val); 816 if (ifindex == 0) { 817 inet->uc_index = 0; 818 err = 0; 819 break; 820 } 821 822 dev = dev_get_by_index(sock_net(sk), ifindex); 823 err = -EADDRNOTAVAIL; 824 if (!dev) 825 break; 826 dev_put(dev); 827 828 err = -EINVAL; 829 if (sk->sk_bound_dev_if) 830 break; 831 832 inet->uc_index = ifindex; 833 err = 0; 834 break; 835 } 836 case IP_MULTICAST_IF: 837 { 838 struct ip_mreqn mreq; 839 struct net_device *dev = NULL; 840 int midx; 841 842 if (sk->sk_type == SOCK_STREAM) 843 goto e_inval; 844 /* 845 * Check the arguments are allowable 846 */ 847 848 if (optlen < sizeof(struct in_addr)) 849 goto e_inval; 850 851 err = -EFAULT; 852 if (optlen >= sizeof(struct ip_mreqn)) { 853 if (copy_from_user(&mreq, optval, sizeof(mreq))) 854 break; 855 } else { 856 memset(&mreq, 0, sizeof(mreq)); 857 if (optlen >= sizeof(struct ip_mreq)) { 858 if (copy_from_user(&mreq, optval, 859 sizeof(struct ip_mreq))) 860 break; 861 } else if (optlen >= sizeof(struct in_addr)) { 862 if (copy_from_user(&mreq.imr_address, optval, 863 sizeof(struct in_addr))) 864 break; 865 } 866 } 867 868 if (!mreq.imr_ifindex) { 869 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 870 inet->mc_index = 0; 871 inet->mc_addr = 0; 872 err = 0; 873 break; 874 } 875 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 876 if (dev) 877 mreq.imr_ifindex = dev->ifindex; 878 } else 879 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 880 881 882 err = -EADDRNOTAVAIL; 883 if (!dev) 884 break; 885 886 midx = l3mdev_master_ifindex(dev); 887 888 dev_put(dev); 889 890 err = -EINVAL; 891 if (sk->sk_bound_dev_if && 892 mreq.imr_ifindex != sk->sk_bound_dev_if && 893 (!midx || midx != sk->sk_bound_dev_if)) 894 break; 895 896 inet->mc_index = mreq.imr_ifindex; 897 inet->mc_addr = mreq.imr_address.s_addr; 898 err = 0; 899 break; 900 } 901 902 case IP_ADD_MEMBERSHIP: 903 case IP_DROP_MEMBERSHIP: 904 { 905 struct ip_mreqn mreq; 906 907 err = -EPROTO; 908 if (inet_sk(sk)->is_icsk) 909 break; 910 911 if (optlen < sizeof(struct ip_mreq)) 912 goto e_inval; 913 err = -EFAULT; 914 if (optlen >= sizeof(struct ip_mreqn)) { 915 if (copy_from_user(&mreq, optval, sizeof(mreq))) 916 break; 917 } else { 918 memset(&mreq, 0, sizeof(mreq)); 919 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 920 break; 921 } 922 923 if (optname == IP_ADD_MEMBERSHIP) 924 err = ip_mc_join_group(sk, &mreq); 925 else 926 err = ip_mc_leave_group(sk, &mreq); 927 break; 928 } 929 case IP_MSFILTER: 930 { 931 struct ip_msfilter *msf; 932 933 if (optlen < IP_MSFILTER_SIZE(0)) 934 goto e_inval; 935 if (optlen > sysctl_optmem_max) { 936 err = -ENOBUFS; 937 break; 938 } 939 msf = memdup_user(optval, optlen); 940 if (IS_ERR(msf)) { 941 err = PTR_ERR(msf); 942 break; 943 } 944 /* numsrc >= (1G-4) overflow in 32 bits */ 945 if (msf->imsf_numsrc >= 0x3ffffffcU || 946 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 947 kfree(msf); 948 err = -ENOBUFS; 949 break; 950 } 951 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 952 kfree(msf); 953 err = -EINVAL; 954 break; 955 } 956 err = ip_mc_msfilter(sk, msf, 0); 957 kfree(msf); 958 break; 959 } 960 case IP_BLOCK_SOURCE: 961 case IP_UNBLOCK_SOURCE: 962 case IP_ADD_SOURCE_MEMBERSHIP: 963 case IP_DROP_SOURCE_MEMBERSHIP: 964 { 965 struct ip_mreq_source mreqs; 966 int omode, add; 967 968 if (optlen != sizeof(struct ip_mreq_source)) 969 goto e_inval; 970 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 971 err = -EFAULT; 972 break; 973 } 974 if (optname == IP_BLOCK_SOURCE) { 975 omode = MCAST_EXCLUDE; 976 add = 1; 977 } else if (optname == IP_UNBLOCK_SOURCE) { 978 omode = MCAST_EXCLUDE; 979 add = 0; 980 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 981 struct ip_mreqn mreq; 982 983 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 984 mreq.imr_address.s_addr = mreqs.imr_interface; 985 mreq.imr_ifindex = 0; 986 err = ip_mc_join_group(sk, &mreq); 987 if (err && err != -EADDRINUSE) 988 break; 989 omode = MCAST_INCLUDE; 990 add = 1; 991 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 992 omode = MCAST_INCLUDE; 993 add = 0; 994 } 995 err = ip_mc_source(add, omode, sk, &mreqs, 0); 996 break; 997 } 998 case MCAST_JOIN_GROUP: 999 case MCAST_LEAVE_GROUP: 1000 { 1001 struct group_req greq; 1002 struct sockaddr_in *psin; 1003 struct ip_mreqn mreq; 1004 1005 if (optlen < sizeof(struct group_req)) 1006 goto e_inval; 1007 err = -EFAULT; 1008 if (copy_from_user(&greq, optval, sizeof(greq))) 1009 break; 1010 psin = (struct sockaddr_in *)&greq.gr_group; 1011 if (psin->sin_family != AF_INET) 1012 goto e_inval; 1013 memset(&mreq, 0, sizeof(mreq)); 1014 mreq.imr_multiaddr = psin->sin_addr; 1015 mreq.imr_ifindex = greq.gr_interface; 1016 1017 if (optname == MCAST_JOIN_GROUP) 1018 err = ip_mc_join_group(sk, &mreq); 1019 else 1020 err = ip_mc_leave_group(sk, &mreq); 1021 break; 1022 } 1023 case MCAST_JOIN_SOURCE_GROUP: 1024 case MCAST_LEAVE_SOURCE_GROUP: 1025 case MCAST_BLOCK_SOURCE: 1026 case MCAST_UNBLOCK_SOURCE: 1027 { 1028 struct group_source_req greqs; 1029 struct ip_mreq_source mreqs; 1030 struct sockaddr_in *psin; 1031 int omode, add; 1032 1033 if (optlen != sizeof(struct group_source_req)) 1034 goto e_inval; 1035 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1036 err = -EFAULT; 1037 break; 1038 } 1039 if (greqs.gsr_group.ss_family != AF_INET || 1040 greqs.gsr_source.ss_family != AF_INET) { 1041 err = -EADDRNOTAVAIL; 1042 break; 1043 } 1044 psin = (struct sockaddr_in *)&greqs.gsr_group; 1045 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1046 psin = (struct sockaddr_in *)&greqs.gsr_source; 1047 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1048 mreqs.imr_interface = 0; /* use index for mc_source */ 1049 1050 if (optname == MCAST_BLOCK_SOURCE) { 1051 omode = MCAST_EXCLUDE; 1052 add = 1; 1053 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1054 omode = MCAST_EXCLUDE; 1055 add = 0; 1056 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1057 struct ip_mreqn mreq; 1058 1059 psin = (struct sockaddr_in *)&greqs.gsr_group; 1060 mreq.imr_multiaddr = psin->sin_addr; 1061 mreq.imr_address.s_addr = 0; 1062 mreq.imr_ifindex = greqs.gsr_interface; 1063 err = ip_mc_join_group(sk, &mreq); 1064 if (err && err != -EADDRINUSE) 1065 break; 1066 greqs.gsr_interface = mreq.imr_ifindex; 1067 omode = MCAST_INCLUDE; 1068 add = 1; 1069 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1070 omode = MCAST_INCLUDE; 1071 add = 0; 1072 } 1073 err = ip_mc_source(add, omode, sk, &mreqs, 1074 greqs.gsr_interface); 1075 break; 1076 } 1077 case MCAST_MSFILTER: 1078 { 1079 struct sockaddr_in *psin; 1080 struct ip_msfilter *msf = NULL; 1081 struct group_filter *gsf = NULL; 1082 int msize, i, ifindex; 1083 1084 if (optlen < GROUP_FILTER_SIZE(0)) 1085 goto e_inval; 1086 if (optlen > sysctl_optmem_max) { 1087 err = -ENOBUFS; 1088 break; 1089 } 1090 gsf = memdup_user(optval, optlen); 1091 if (IS_ERR(gsf)) { 1092 err = PTR_ERR(gsf); 1093 break; 1094 } 1095 1096 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1097 if (gsf->gf_numsrc >= 0x1ffffff || 1098 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1099 err = -ENOBUFS; 1100 goto mc_msf_out; 1101 } 1102 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1103 err = -EINVAL; 1104 goto mc_msf_out; 1105 } 1106 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1107 msf = kmalloc(msize, GFP_KERNEL); 1108 if (!msf) { 1109 err = -ENOBUFS; 1110 goto mc_msf_out; 1111 } 1112 ifindex = gsf->gf_interface; 1113 psin = (struct sockaddr_in *)&gsf->gf_group; 1114 if (psin->sin_family != AF_INET) { 1115 err = -EADDRNOTAVAIL; 1116 goto mc_msf_out; 1117 } 1118 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1119 msf->imsf_interface = 0; 1120 msf->imsf_fmode = gsf->gf_fmode; 1121 msf->imsf_numsrc = gsf->gf_numsrc; 1122 err = -EADDRNOTAVAIL; 1123 for (i = 0; i < gsf->gf_numsrc; ++i) { 1124 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1125 1126 if (psin->sin_family != AF_INET) 1127 goto mc_msf_out; 1128 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1129 } 1130 kfree(gsf); 1131 gsf = NULL; 1132 1133 err = ip_mc_msfilter(sk, msf, ifindex); 1134 mc_msf_out: 1135 kfree(msf); 1136 kfree(gsf); 1137 break; 1138 } 1139 case IP_MULTICAST_ALL: 1140 if (optlen < 1) 1141 goto e_inval; 1142 if (val != 0 && val != 1) 1143 goto e_inval; 1144 inet->mc_all = val; 1145 break; 1146 case IP_ROUTER_ALERT: 1147 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1148 break; 1149 1150 case IP_FREEBIND: 1151 if (optlen < 1) 1152 goto e_inval; 1153 inet->freebind = !!val; 1154 break; 1155 1156 case IP_IPSEC_POLICY: 1157 case IP_XFRM_POLICY: 1158 err = -EPERM; 1159 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1160 break; 1161 err = xfrm_user_policy(sk, optname, optval, optlen); 1162 break; 1163 1164 case IP_TRANSPARENT: 1165 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1166 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1167 err = -EPERM; 1168 break; 1169 } 1170 if (optlen < 1) 1171 goto e_inval; 1172 inet->transparent = !!val; 1173 break; 1174 1175 case IP_MINTTL: 1176 if (optlen < 1) 1177 goto e_inval; 1178 if (val < 0 || val > 255) 1179 goto e_inval; 1180 inet->min_ttl = val; 1181 break; 1182 1183 default: 1184 err = -ENOPROTOOPT; 1185 break; 1186 } 1187 release_sock(sk); 1188 if (needs_rtnl) 1189 rtnl_unlock(); 1190 return err; 1191 1192 e_inval: 1193 release_sock(sk); 1194 if (needs_rtnl) 1195 rtnl_unlock(); 1196 return -EINVAL; 1197 } 1198 1199 /** 1200 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1201 * @sk: socket 1202 * @skb: buffer 1203 * 1204 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1205 * destination in skb->cb[] before dst drop. 1206 * This way, receiver doesn't make cache line misses to read rtable. 1207 */ 1208 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1209 { 1210 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1211 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1212 ipv6_sk_rxinfo(sk); 1213 1214 if (prepare && skb_rtable(skb)) { 1215 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1216 * which has interface index (iif) as the first member of the 1217 * underlying inet{6}_skb_parm struct. This code then overlays 1218 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1219 * element so the iif is picked up from the prior IPCB. If iif 1220 * is the loopback interface, then return the sending interface 1221 * (e.g., process binds socket to eth0 for Tx which is 1222 * redirected to loopback in the rtable/dst). 1223 */ 1224 struct rtable *rt = skb_rtable(skb); 1225 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1226 1227 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1228 pktinfo->ipi_ifindex = inet_iif(skb); 1229 else if (l3slave && rt && rt->rt_iif) 1230 pktinfo->ipi_ifindex = rt->rt_iif; 1231 1232 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1233 } else { 1234 pktinfo->ipi_ifindex = 0; 1235 pktinfo->ipi_spec_dst.s_addr = 0; 1236 } 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