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 } 324 325 326 /* Special input handler for packets caught by router alert option. 327 They are selected only by protocol field, and then processed likely 328 local ones; but only if someone wants them! Otherwise, router 329 not running rsvpd will kill RSVP. 330 331 It is user level problem, what it will make with them. 332 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 333 but receiver should be enough clever f.e. to forward mtrace requests, 334 sent to multicast group to reach destination designated router. 335 */ 336 struct ip_ra_chain __rcu *ip_ra_chain; 337 338 339 static void ip_ra_destroy_rcu(struct rcu_head *head) 340 { 341 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 342 343 sock_put(ra->saved_sk); 344 kfree(ra); 345 } 346 347 int ip_ra_control(struct sock *sk, unsigned char on, 348 void (*destructor)(struct sock *)) 349 { 350 struct ip_ra_chain *ra, *new_ra; 351 struct ip_ra_chain __rcu **rap; 352 353 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 354 return -EINVAL; 355 356 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 357 358 for (rap = &ip_ra_chain; 359 (ra = rtnl_dereference(*rap)) != NULL; 360 rap = &ra->next) { 361 if (ra->sk == sk) { 362 if (on) { 363 kfree(new_ra); 364 return -EADDRINUSE; 365 } 366 /* dont let ip_call_ra_chain() use sk again */ 367 ra->sk = NULL; 368 RCU_INIT_POINTER(*rap, ra->next); 369 370 if (ra->destructor) 371 ra->destructor(sk); 372 /* 373 * Delay sock_put(sk) and kfree(ra) after one rcu grace 374 * period. This guarantee ip_call_ra_chain() dont need 375 * to mess with socket refcounts. 376 */ 377 ra->saved_sk = sk; 378 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 379 return 0; 380 } 381 } 382 if (!new_ra) 383 return -ENOBUFS; 384 new_ra->sk = sk; 385 new_ra->destructor = destructor; 386 387 RCU_INIT_POINTER(new_ra->next, ra); 388 rcu_assign_pointer(*rap, new_ra); 389 sock_hold(sk); 390 391 return 0; 392 } 393 394 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 395 __be16 port, u32 info, u8 *payload) 396 { 397 struct sock_exterr_skb *serr; 398 399 skb = skb_clone(skb, GFP_ATOMIC); 400 if (!skb) 401 return; 402 403 serr = SKB_EXT_ERR(skb); 404 serr->ee.ee_errno = err; 405 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 406 serr->ee.ee_type = icmp_hdr(skb)->type; 407 serr->ee.ee_code = icmp_hdr(skb)->code; 408 serr->ee.ee_pad = 0; 409 serr->ee.ee_info = info; 410 serr->ee.ee_data = 0; 411 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 412 skb_network_header(skb); 413 serr->port = port; 414 415 if (skb_pull(skb, payload - skb->data)) { 416 skb_reset_transport_header(skb); 417 if (sock_queue_err_skb(sk, skb) == 0) 418 return; 419 } 420 kfree_skb(skb); 421 } 422 423 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 424 { 425 struct inet_sock *inet = inet_sk(sk); 426 struct sock_exterr_skb *serr; 427 struct iphdr *iph; 428 struct sk_buff *skb; 429 430 if (!inet->recverr) 431 return; 432 433 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 434 if (!skb) 435 return; 436 437 skb_put(skb, sizeof(struct iphdr)); 438 skb_reset_network_header(skb); 439 iph = ip_hdr(skb); 440 iph->daddr = daddr; 441 442 serr = SKB_EXT_ERR(skb); 443 serr->ee.ee_errno = err; 444 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 445 serr->ee.ee_type = 0; 446 serr->ee.ee_code = 0; 447 serr->ee.ee_pad = 0; 448 serr->ee.ee_info = info; 449 serr->ee.ee_data = 0; 450 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 451 serr->port = port; 452 453 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 454 skb_reset_transport_header(skb); 455 456 if (sock_queue_err_skb(sk, skb)) 457 kfree_skb(skb); 458 } 459 460 /* For some errors we have valid addr_offset even with zero payload and 461 * zero port. Also, addr_offset should be supported if port is set. 462 */ 463 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 464 { 465 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 466 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 467 } 468 469 /* IPv4 supports cmsg on all imcp errors and some timestamps 470 * 471 * Timestamp code paths do not initialize the fields expected by cmsg: 472 * the PKTINFO fields in skb->cb[]. Fill those in here. 473 */ 474 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 475 struct sk_buff *skb, 476 int ee_origin) 477 { 478 struct in_pktinfo *info; 479 480 if (ee_origin == SO_EE_ORIGIN_ICMP) 481 return true; 482 483 if (ee_origin == SO_EE_ORIGIN_LOCAL) 484 return false; 485 486 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 487 * timestamp with egress dev. Not possible for packets without iif 488 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 489 */ 490 info = PKTINFO_SKB_CB(skb); 491 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 492 !info->ipi_ifindex) 493 return false; 494 495 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 496 return true; 497 } 498 499 /* 500 * Handle MSG_ERRQUEUE 501 */ 502 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 503 { 504 struct sock_exterr_skb *serr; 505 struct sk_buff *skb; 506 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 507 struct { 508 struct sock_extended_err ee; 509 struct sockaddr_in offender; 510 } errhdr; 511 int err; 512 int copied; 513 514 WARN_ON_ONCE(sk->sk_family == AF_INET6); 515 516 err = -EAGAIN; 517 skb = sock_dequeue_err_skb(sk); 518 if (!skb) 519 goto out; 520 521 copied = skb->len; 522 if (copied > len) { 523 msg->msg_flags |= MSG_TRUNC; 524 copied = len; 525 } 526 err = skb_copy_datagram_msg(skb, 0, msg, copied); 527 if (unlikely(err)) { 528 kfree_skb(skb); 529 return err; 530 } 531 sock_recv_timestamp(msg, sk, skb); 532 533 serr = SKB_EXT_ERR(skb); 534 535 if (sin && ipv4_datagram_support_addr(serr)) { 536 sin->sin_family = AF_INET; 537 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 538 serr->addr_offset); 539 sin->sin_port = serr->port; 540 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 541 *addr_len = sizeof(*sin); 542 } 543 544 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 545 sin = &errhdr.offender; 546 memset(sin, 0, sizeof(*sin)); 547 548 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 549 sin->sin_family = AF_INET; 550 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 551 if (inet_sk(sk)->cmsg_flags) 552 ip_cmsg_recv(msg, skb); 553 } 554 555 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 556 557 /* Now we could try to dump offended packet options */ 558 559 msg->msg_flags |= MSG_ERRQUEUE; 560 err = copied; 561 562 consume_skb(skb); 563 out: 564 return err; 565 } 566 567 568 /* 569 * Socket option code for IP. This is the end of the line after any 570 * TCP,UDP etc options on an IP socket. 571 */ 572 static bool setsockopt_needs_rtnl(int optname) 573 { 574 switch (optname) { 575 case IP_ADD_MEMBERSHIP: 576 case IP_ADD_SOURCE_MEMBERSHIP: 577 case IP_BLOCK_SOURCE: 578 case IP_DROP_MEMBERSHIP: 579 case IP_DROP_SOURCE_MEMBERSHIP: 580 case IP_MSFILTER: 581 case IP_UNBLOCK_SOURCE: 582 case MCAST_BLOCK_SOURCE: 583 case MCAST_MSFILTER: 584 case MCAST_JOIN_GROUP: 585 case MCAST_JOIN_SOURCE_GROUP: 586 case MCAST_LEAVE_GROUP: 587 case MCAST_LEAVE_SOURCE_GROUP: 588 case MCAST_UNBLOCK_SOURCE: 589 case IP_ROUTER_ALERT: 590 return true; 591 } 592 return false; 593 } 594 595 static int do_ip_setsockopt(struct sock *sk, int level, 596 int optname, char __user *optval, unsigned int optlen) 597 { 598 struct inet_sock *inet = inet_sk(sk); 599 struct net *net = sock_net(sk); 600 int val = 0, err; 601 bool needs_rtnl = setsockopt_needs_rtnl(optname); 602 603 switch (optname) { 604 case IP_PKTINFO: 605 case IP_RECVTTL: 606 case IP_RECVOPTS: 607 case IP_RECVTOS: 608 case IP_RETOPTS: 609 case IP_TOS: 610 case IP_TTL: 611 case IP_HDRINCL: 612 case IP_MTU_DISCOVER: 613 case IP_RECVERR: 614 case IP_ROUTER_ALERT: 615 case IP_FREEBIND: 616 case IP_PASSSEC: 617 case IP_TRANSPARENT: 618 case IP_MINTTL: 619 case IP_NODEFRAG: 620 case IP_BIND_ADDRESS_NO_PORT: 621 case IP_UNICAST_IF: 622 case IP_MULTICAST_TTL: 623 case IP_MULTICAST_ALL: 624 case IP_MULTICAST_LOOP: 625 case IP_RECVORIGDSTADDR: 626 case IP_CHECKSUM: 627 case IP_RECVFRAGSIZE: 628 if (optlen >= sizeof(int)) { 629 if (get_user(val, (int __user *) optval)) 630 return -EFAULT; 631 } else if (optlen >= sizeof(char)) { 632 unsigned char ucval; 633 634 if (get_user(ucval, (unsigned char __user *) optval)) 635 return -EFAULT; 636 val = (int) ucval; 637 } 638 } 639 640 /* If optlen==0, it is equivalent to val == 0 */ 641 642 if (ip_mroute_opt(optname)) 643 return ip_mroute_setsockopt(sk, optname, optval, optlen); 644 645 err = 0; 646 if (needs_rtnl) 647 rtnl_lock(); 648 lock_sock(sk); 649 650 switch (optname) { 651 case IP_OPTIONS: 652 { 653 struct ip_options_rcu *old, *opt = NULL; 654 655 if (optlen > 40) 656 goto e_inval; 657 err = ip_options_get_from_user(sock_net(sk), &opt, 658 optval, optlen); 659 if (err) 660 break; 661 old = rcu_dereference_protected(inet->inet_opt, 662 lockdep_sock_is_held(sk)); 663 if (inet->is_icsk) { 664 struct inet_connection_sock *icsk = inet_csk(sk); 665 #if IS_ENABLED(CONFIG_IPV6) 666 if (sk->sk_family == PF_INET || 667 (!((1 << sk->sk_state) & 668 (TCPF_LISTEN | TCPF_CLOSE)) && 669 inet->inet_daddr != LOOPBACK4_IPV6)) { 670 #endif 671 if (old) 672 icsk->icsk_ext_hdr_len -= old->opt.optlen; 673 if (opt) 674 icsk->icsk_ext_hdr_len += opt->opt.optlen; 675 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 676 #if IS_ENABLED(CONFIG_IPV6) 677 } 678 #endif 679 } 680 rcu_assign_pointer(inet->inet_opt, opt); 681 if (old) 682 kfree_rcu(old, rcu); 683 break; 684 } 685 case IP_PKTINFO: 686 if (val) 687 inet->cmsg_flags |= IP_CMSG_PKTINFO; 688 else 689 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 690 break; 691 case IP_RECVTTL: 692 if (val) 693 inet->cmsg_flags |= IP_CMSG_TTL; 694 else 695 inet->cmsg_flags &= ~IP_CMSG_TTL; 696 break; 697 case IP_RECVTOS: 698 if (val) 699 inet->cmsg_flags |= IP_CMSG_TOS; 700 else 701 inet->cmsg_flags &= ~IP_CMSG_TOS; 702 break; 703 case IP_RECVOPTS: 704 if (val) 705 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 706 else 707 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 708 break; 709 case IP_RETOPTS: 710 if (val) 711 inet->cmsg_flags |= IP_CMSG_RETOPTS; 712 else 713 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 714 break; 715 case IP_PASSSEC: 716 if (val) 717 inet->cmsg_flags |= IP_CMSG_PASSSEC; 718 else 719 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 720 break; 721 case IP_RECVORIGDSTADDR: 722 if (val) 723 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 724 else 725 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 726 break; 727 case IP_CHECKSUM: 728 if (val) { 729 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 730 inet_inc_convert_csum(sk); 731 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 732 } 733 } else { 734 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 735 inet_dec_convert_csum(sk); 736 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 737 } 738 } 739 break; 740 case IP_RECVFRAGSIZE: 741 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 742 goto e_inval; 743 if (val) 744 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 745 else 746 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 747 break; 748 case IP_TOS: /* This sets both TOS and Precedence */ 749 if (sk->sk_type == SOCK_STREAM) { 750 val &= ~INET_ECN_MASK; 751 val |= inet->tos & INET_ECN_MASK; 752 } 753 if (inet->tos != val) { 754 inet->tos = val; 755 sk->sk_priority = rt_tos2priority(val); 756 sk_dst_reset(sk); 757 } 758 break; 759 case IP_TTL: 760 if (optlen < 1) 761 goto e_inval; 762 if (val != -1 && (val < 1 || val > 255)) 763 goto e_inval; 764 inet->uc_ttl = val; 765 break; 766 case IP_HDRINCL: 767 if (sk->sk_type != SOCK_RAW) { 768 err = -ENOPROTOOPT; 769 break; 770 } 771 inet->hdrincl = val ? 1 : 0; 772 break; 773 case IP_NODEFRAG: 774 if (sk->sk_type != SOCK_RAW) { 775 err = -ENOPROTOOPT; 776 break; 777 } 778 inet->nodefrag = val ? 1 : 0; 779 break; 780 case IP_BIND_ADDRESS_NO_PORT: 781 inet->bind_address_no_port = val ? 1 : 0; 782 break; 783 case IP_MTU_DISCOVER: 784 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 785 goto e_inval; 786 inet->pmtudisc = val; 787 break; 788 case IP_RECVERR: 789 inet->recverr = !!val; 790 if (!val) 791 skb_queue_purge(&sk->sk_error_queue); 792 break; 793 case IP_MULTICAST_TTL: 794 if (sk->sk_type == SOCK_STREAM) 795 goto e_inval; 796 if (optlen < 1) 797 goto e_inval; 798 if (val == -1) 799 val = 1; 800 if (val < 0 || val > 255) 801 goto e_inval; 802 inet->mc_ttl = val; 803 break; 804 case IP_MULTICAST_LOOP: 805 if (optlen < 1) 806 goto e_inval; 807 inet->mc_loop = !!val; 808 break; 809 case IP_UNICAST_IF: 810 { 811 struct net_device *dev = NULL; 812 int ifindex; 813 int midx; 814 815 if (optlen != sizeof(int)) 816 goto e_inval; 817 818 ifindex = (__force int)ntohl((__force __be32)val); 819 if (ifindex == 0) { 820 inet->uc_index = 0; 821 err = 0; 822 break; 823 } 824 825 dev = dev_get_by_index(sock_net(sk), ifindex); 826 err = -EADDRNOTAVAIL; 827 if (!dev) 828 break; 829 830 midx = l3mdev_master_ifindex(dev); 831 dev_put(dev); 832 833 err = -EINVAL; 834 if (sk->sk_bound_dev_if && 835 (!midx || midx != sk->sk_bound_dev_if)) 836 break; 837 838 inet->uc_index = ifindex; 839 err = 0; 840 break; 841 } 842 case IP_MULTICAST_IF: 843 { 844 struct ip_mreqn mreq; 845 struct net_device *dev = NULL; 846 int midx; 847 848 if (sk->sk_type == SOCK_STREAM) 849 goto e_inval; 850 /* 851 * Check the arguments are allowable 852 */ 853 854 if (optlen < sizeof(struct in_addr)) 855 goto e_inval; 856 857 err = -EFAULT; 858 if (optlen >= sizeof(struct ip_mreqn)) { 859 if (copy_from_user(&mreq, optval, sizeof(mreq))) 860 break; 861 } else { 862 memset(&mreq, 0, sizeof(mreq)); 863 if (optlen >= sizeof(struct ip_mreq)) { 864 if (copy_from_user(&mreq, optval, 865 sizeof(struct ip_mreq))) 866 break; 867 } else if (optlen >= sizeof(struct in_addr)) { 868 if (copy_from_user(&mreq.imr_address, optval, 869 sizeof(struct in_addr))) 870 break; 871 } 872 } 873 874 if (!mreq.imr_ifindex) { 875 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 876 inet->mc_index = 0; 877 inet->mc_addr = 0; 878 err = 0; 879 break; 880 } 881 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 882 if (dev) 883 mreq.imr_ifindex = dev->ifindex; 884 } else 885 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 886 887 888 err = -EADDRNOTAVAIL; 889 if (!dev) 890 break; 891 892 midx = l3mdev_master_ifindex(dev); 893 894 dev_put(dev); 895 896 err = -EINVAL; 897 if (sk->sk_bound_dev_if && 898 mreq.imr_ifindex != sk->sk_bound_dev_if && 899 (!midx || midx != sk->sk_bound_dev_if)) 900 break; 901 902 inet->mc_index = mreq.imr_ifindex; 903 inet->mc_addr = mreq.imr_address.s_addr; 904 err = 0; 905 break; 906 } 907 908 case IP_ADD_MEMBERSHIP: 909 case IP_DROP_MEMBERSHIP: 910 { 911 struct ip_mreqn mreq; 912 913 err = -EPROTO; 914 if (inet_sk(sk)->is_icsk) 915 break; 916 917 if (optlen < sizeof(struct ip_mreq)) 918 goto e_inval; 919 err = -EFAULT; 920 if (optlen >= sizeof(struct ip_mreqn)) { 921 if (copy_from_user(&mreq, optval, sizeof(mreq))) 922 break; 923 } else { 924 memset(&mreq, 0, sizeof(mreq)); 925 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 926 break; 927 } 928 929 if (optname == IP_ADD_MEMBERSHIP) 930 err = ip_mc_join_group(sk, &mreq); 931 else 932 err = ip_mc_leave_group(sk, &mreq); 933 break; 934 } 935 case IP_MSFILTER: 936 { 937 struct ip_msfilter *msf; 938 939 if (optlen < IP_MSFILTER_SIZE(0)) 940 goto e_inval; 941 if (optlen > sysctl_optmem_max) { 942 err = -ENOBUFS; 943 break; 944 } 945 msf = memdup_user(optval, optlen); 946 if (IS_ERR(msf)) { 947 err = PTR_ERR(msf); 948 break; 949 } 950 /* numsrc >= (1G-4) overflow in 32 bits */ 951 if (msf->imsf_numsrc >= 0x3ffffffcU || 952 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 953 kfree(msf); 954 err = -ENOBUFS; 955 break; 956 } 957 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 958 kfree(msf); 959 err = -EINVAL; 960 break; 961 } 962 err = ip_mc_msfilter(sk, msf, 0); 963 kfree(msf); 964 break; 965 } 966 case IP_BLOCK_SOURCE: 967 case IP_UNBLOCK_SOURCE: 968 case IP_ADD_SOURCE_MEMBERSHIP: 969 case IP_DROP_SOURCE_MEMBERSHIP: 970 { 971 struct ip_mreq_source mreqs; 972 int omode, add; 973 974 if (optlen != sizeof(struct ip_mreq_source)) 975 goto e_inval; 976 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 977 err = -EFAULT; 978 break; 979 } 980 if (optname == IP_BLOCK_SOURCE) { 981 omode = MCAST_EXCLUDE; 982 add = 1; 983 } else if (optname == IP_UNBLOCK_SOURCE) { 984 omode = MCAST_EXCLUDE; 985 add = 0; 986 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 987 struct ip_mreqn mreq; 988 989 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 990 mreq.imr_address.s_addr = mreqs.imr_interface; 991 mreq.imr_ifindex = 0; 992 err = ip_mc_join_group(sk, &mreq); 993 if (err && err != -EADDRINUSE) 994 break; 995 omode = MCAST_INCLUDE; 996 add = 1; 997 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 998 omode = MCAST_INCLUDE; 999 add = 0; 1000 } 1001 err = ip_mc_source(add, omode, sk, &mreqs, 0); 1002 break; 1003 } 1004 case MCAST_JOIN_GROUP: 1005 case MCAST_LEAVE_GROUP: 1006 { 1007 struct group_req greq; 1008 struct sockaddr_in *psin; 1009 struct ip_mreqn mreq; 1010 1011 if (optlen < sizeof(struct group_req)) 1012 goto e_inval; 1013 err = -EFAULT; 1014 if (copy_from_user(&greq, optval, sizeof(greq))) 1015 break; 1016 psin = (struct sockaddr_in *)&greq.gr_group; 1017 if (psin->sin_family != AF_INET) 1018 goto e_inval; 1019 memset(&mreq, 0, sizeof(mreq)); 1020 mreq.imr_multiaddr = psin->sin_addr; 1021 mreq.imr_ifindex = greq.gr_interface; 1022 1023 if (optname == MCAST_JOIN_GROUP) 1024 err = ip_mc_join_group(sk, &mreq); 1025 else 1026 err = ip_mc_leave_group(sk, &mreq); 1027 break; 1028 } 1029 case MCAST_JOIN_SOURCE_GROUP: 1030 case MCAST_LEAVE_SOURCE_GROUP: 1031 case MCAST_BLOCK_SOURCE: 1032 case MCAST_UNBLOCK_SOURCE: 1033 { 1034 struct group_source_req greqs; 1035 struct ip_mreq_source mreqs; 1036 struct sockaddr_in *psin; 1037 int omode, add; 1038 1039 if (optlen != sizeof(struct group_source_req)) 1040 goto e_inval; 1041 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1042 err = -EFAULT; 1043 break; 1044 } 1045 if (greqs.gsr_group.ss_family != AF_INET || 1046 greqs.gsr_source.ss_family != AF_INET) { 1047 err = -EADDRNOTAVAIL; 1048 break; 1049 } 1050 psin = (struct sockaddr_in *)&greqs.gsr_group; 1051 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1052 psin = (struct sockaddr_in *)&greqs.gsr_source; 1053 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1054 mreqs.imr_interface = 0; /* use index for mc_source */ 1055 1056 if (optname == MCAST_BLOCK_SOURCE) { 1057 omode = MCAST_EXCLUDE; 1058 add = 1; 1059 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1060 omode = MCAST_EXCLUDE; 1061 add = 0; 1062 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1063 struct ip_mreqn mreq; 1064 1065 psin = (struct sockaddr_in *)&greqs.gsr_group; 1066 mreq.imr_multiaddr = psin->sin_addr; 1067 mreq.imr_address.s_addr = 0; 1068 mreq.imr_ifindex = greqs.gsr_interface; 1069 err = ip_mc_join_group(sk, &mreq); 1070 if (err && err != -EADDRINUSE) 1071 break; 1072 greqs.gsr_interface = mreq.imr_ifindex; 1073 omode = MCAST_INCLUDE; 1074 add = 1; 1075 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1076 omode = MCAST_INCLUDE; 1077 add = 0; 1078 } 1079 err = ip_mc_source(add, omode, sk, &mreqs, 1080 greqs.gsr_interface); 1081 break; 1082 } 1083 case MCAST_MSFILTER: 1084 { 1085 struct sockaddr_in *psin; 1086 struct ip_msfilter *msf = NULL; 1087 struct group_filter *gsf = NULL; 1088 int msize, i, ifindex; 1089 1090 if (optlen < GROUP_FILTER_SIZE(0)) 1091 goto e_inval; 1092 if (optlen > sysctl_optmem_max) { 1093 err = -ENOBUFS; 1094 break; 1095 } 1096 gsf = memdup_user(optval, optlen); 1097 if (IS_ERR(gsf)) { 1098 err = PTR_ERR(gsf); 1099 break; 1100 } 1101 1102 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1103 if (gsf->gf_numsrc >= 0x1ffffff || 1104 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1105 err = -ENOBUFS; 1106 goto mc_msf_out; 1107 } 1108 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1109 err = -EINVAL; 1110 goto mc_msf_out; 1111 } 1112 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1113 msf = kmalloc(msize, GFP_KERNEL); 1114 if (!msf) { 1115 err = -ENOBUFS; 1116 goto mc_msf_out; 1117 } 1118 ifindex = gsf->gf_interface; 1119 psin = (struct sockaddr_in *)&gsf->gf_group; 1120 if (psin->sin_family != AF_INET) { 1121 err = -EADDRNOTAVAIL; 1122 goto mc_msf_out; 1123 } 1124 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1125 msf->imsf_interface = 0; 1126 msf->imsf_fmode = gsf->gf_fmode; 1127 msf->imsf_numsrc = gsf->gf_numsrc; 1128 err = -EADDRNOTAVAIL; 1129 for (i = 0; i < gsf->gf_numsrc; ++i) { 1130 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1131 1132 if (psin->sin_family != AF_INET) 1133 goto mc_msf_out; 1134 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1135 } 1136 kfree(gsf); 1137 gsf = NULL; 1138 1139 err = ip_mc_msfilter(sk, msf, ifindex); 1140 mc_msf_out: 1141 kfree(msf); 1142 kfree(gsf); 1143 break; 1144 } 1145 case IP_MULTICAST_ALL: 1146 if (optlen < 1) 1147 goto e_inval; 1148 if (val != 0 && val != 1) 1149 goto e_inval; 1150 inet->mc_all = val; 1151 break; 1152 case IP_ROUTER_ALERT: 1153 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1154 break; 1155 1156 case IP_FREEBIND: 1157 if (optlen < 1) 1158 goto e_inval; 1159 inet->freebind = !!val; 1160 break; 1161 1162 case IP_IPSEC_POLICY: 1163 case IP_XFRM_POLICY: 1164 err = -EPERM; 1165 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1166 break; 1167 err = xfrm_user_policy(sk, optname, optval, optlen); 1168 break; 1169 1170 case IP_TRANSPARENT: 1171 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1172 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1173 err = -EPERM; 1174 break; 1175 } 1176 if (optlen < 1) 1177 goto e_inval; 1178 inet->transparent = !!val; 1179 break; 1180 1181 case IP_MINTTL: 1182 if (optlen < 1) 1183 goto e_inval; 1184 if (val < 0 || val > 255) 1185 goto e_inval; 1186 inet->min_ttl = val; 1187 break; 1188 1189 default: 1190 err = -ENOPROTOOPT; 1191 break; 1192 } 1193 release_sock(sk); 1194 if (needs_rtnl) 1195 rtnl_unlock(); 1196 return err; 1197 1198 e_inval: 1199 release_sock(sk); 1200 if (needs_rtnl) 1201 rtnl_unlock(); 1202 return -EINVAL; 1203 } 1204 1205 /** 1206 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1207 * @sk: socket 1208 * @skb: buffer 1209 * 1210 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1211 * destination in skb->cb[] before dst drop. 1212 * This way, receiver doesn't make cache line misses to read rtable. 1213 */ 1214 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1215 { 1216 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1217 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1218 ipv6_sk_rxinfo(sk); 1219 1220 if (prepare && skb_rtable(skb)) { 1221 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1222 * which has interface index (iif) as the first member of the 1223 * underlying inet{6}_skb_parm struct. This code then overlays 1224 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1225 * element so the iif is picked up from the prior IPCB. If iif 1226 * is the loopback interface, then return the sending interface 1227 * (e.g., process binds socket to eth0 for Tx which is 1228 * redirected to loopback in the rtable/dst). 1229 */ 1230 struct rtable *rt = skb_rtable(skb); 1231 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1232 1233 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1234 pktinfo->ipi_ifindex = inet_iif(skb); 1235 else if (l3slave && rt && rt->rt_iif) 1236 pktinfo->ipi_ifindex = rt->rt_iif; 1237 1238 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1239 } else { 1240 pktinfo->ipi_ifindex = 0; 1241 pktinfo->ipi_spec_dst.s_addr = 0; 1242 } 1243 skb_dst_drop(skb); 1244 } 1245 1246 int ip_setsockopt(struct sock *sk, int level, 1247 int optname, char __user *optval, unsigned int optlen) 1248 { 1249 int err; 1250 1251 if (level != SOL_IP) 1252 return -ENOPROTOOPT; 1253 1254 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1255 #ifdef CONFIG_NETFILTER 1256 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1257 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1258 optname != IP_IPSEC_POLICY && 1259 optname != IP_XFRM_POLICY && 1260 !ip_mroute_opt(optname)) 1261 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1262 #endif 1263 return err; 1264 } 1265 EXPORT_SYMBOL(ip_setsockopt); 1266 1267 #ifdef CONFIG_COMPAT 1268 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1269 char __user *optval, unsigned int optlen) 1270 { 1271 int err; 1272 1273 if (level != SOL_IP) 1274 return -ENOPROTOOPT; 1275 1276 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1277 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1278 ip_setsockopt); 1279 1280 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1281 #ifdef CONFIG_NETFILTER 1282 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1283 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1284 optname != IP_IPSEC_POLICY && 1285 optname != IP_XFRM_POLICY && 1286 !ip_mroute_opt(optname)) 1287 err = compat_nf_setsockopt(sk, PF_INET, optname, optval, 1288 optlen); 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 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1573 if (err >= 0) 1574 err = put_user(len, optlen); 1575 return err; 1576 } 1577 #endif 1578 return err; 1579 } 1580 EXPORT_SYMBOL(ip_getsockopt); 1581 1582 #ifdef CONFIG_COMPAT 1583 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1584 char __user *optval, int __user *optlen) 1585 { 1586 int err; 1587 1588 if (optname == MCAST_MSFILTER) 1589 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1590 ip_getsockopt); 1591 1592 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1593 MSG_CMSG_COMPAT); 1594 1595 #ifdef CONFIG_NETFILTER 1596 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1597 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1598 !ip_mroute_opt(optname)) { 1599 int len; 1600 1601 if (get_user(len, optlen)) 1602 return -EFAULT; 1603 1604 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1605 if (err >= 0) 1606 err = put_user(len, optlen); 1607 return err; 1608 } 1609 #endif 1610 return err; 1611 } 1612 EXPORT_SYMBOL(compat_ip_getsockopt); 1613 #endif 1614