1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * The IP to API glue. 7 * 8 * Authors: see ip.c 9 * 10 * Fixes: 11 * Many : Split from ip.c , see ip.c for history. 12 * Martin Mares : TOS setting fixed. 13 * Alan Cox : Fixed a couple of oopses in Martin's 14 * TOS tweaks. 15 * Mike McLagan : Routing by source 16 */ 17 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/mm.h> 21 #include <linux/skbuff.h> 22 #include <linux/ip.h> 23 #include <linux/icmp.h> 24 #include <linux/inetdevice.h> 25 #include <linux/netdevice.h> 26 #include <linux/slab.h> 27 #include <net/sock.h> 28 #include <net/ip.h> 29 #include <net/icmp.h> 30 #include <net/tcp_states.h> 31 #include <linux/udp.h> 32 #include <linux/igmp.h> 33 #include <linux/netfilter.h> 34 #include <linux/route.h> 35 #include <linux/mroute.h> 36 #include <net/inet_ecn.h> 37 #include <net/route.h> 38 #include <net/xfrm.h> 39 #include <net/compat.h> 40 #include <net/checksum.h> 41 #if IS_ENABLED(CONFIG_IPV6) 42 #include <net/transp_v6.h> 43 #endif 44 #include <net/ip_fib.h> 45 46 #include <linux/errqueue.h> 47 #include <linux/uaccess.h> 48 49 /* 50 * SOL_IP control messages. 51 */ 52 53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 54 { 55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 56 57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 58 59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 60 } 61 62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 63 { 64 int ttl = ip_hdr(skb)->ttl; 65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 66 } 67 68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 69 { 70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 71 } 72 73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 74 { 75 if (IPCB(skb)->opt.optlen == 0) 76 return; 77 78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 79 ip_hdr(skb) + 1); 80 } 81 82 83 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, 84 struct sk_buff *skb) 85 { 86 unsigned char optbuf[sizeof(struct ip_options) + 40]; 87 struct ip_options *opt = (struct ip_options *)optbuf; 88 89 if (IPCB(skb)->opt.optlen == 0) 90 return; 91 92 if (ip_options_echo(net, opt, skb)) { 93 msg->msg_flags |= MSG_CTRUNC; 94 return; 95 } 96 ip_options_undo(opt); 97 98 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 99 } 100 101 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) 102 { 103 int val; 104 105 if (IPCB(skb)->frag_max_size == 0) 106 return; 107 108 val = IPCB(skb)->frag_max_size; 109 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 110 } 111 112 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 113 int tlen, int offset) 114 { 115 __wsum csum = skb->csum; 116 117 if (skb->ip_summed != CHECKSUM_COMPLETE) 118 return; 119 120 if (offset != 0) { 121 int tend_off = skb_transport_offset(skb) + tlen; 122 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 123 } 124 125 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 126 } 127 128 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 129 { 130 char *secdata; 131 u32 seclen, secid; 132 int err; 133 134 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 135 if (err) 136 return; 137 138 err = security_secid_to_secctx(secid, &secdata, &seclen); 139 if (err) 140 return; 141 142 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 143 security_release_secctx(secdata, seclen); 144 } 145 146 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 147 { 148 struct sockaddr_in sin; 149 const struct iphdr *iph = ip_hdr(skb); 150 __be16 *ports = (__be16 *)skb_transport_header(skb); 151 152 if (skb_transport_offset(skb) + 4 > (int)skb->len) 153 return; 154 155 /* All current transport protocols have the port numbers in the 156 * first four bytes of the transport header and this function is 157 * written with this assumption in mind. 158 */ 159 160 sin.sin_family = AF_INET; 161 sin.sin_addr.s_addr = iph->daddr; 162 sin.sin_port = ports[1]; 163 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 164 165 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 166 } 167 168 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 169 struct sk_buff *skb, int tlen, int offset) 170 { 171 struct inet_sock *inet = inet_sk(sk); 172 unsigned int flags = inet->cmsg_flags; 173 174 /* Ordered by supposed usage frequency */ 175 if (flags & IP_CMSG_PKTINFO) { 176 ip_cmsg_recv_pktinfo(msg, skb); 177 178 flags &= ~IP_CMSG_PKTINFO; 179 if (!flags) 180 return; 181 } 182 183 if (flags & IP_CMSG_TTL) { 184 ip_cmsg_recv_ttl(msg, skb); 185 186 flags &= ~IP_CMSG_TTL; 187 if (!flags) 188 return; 189 } 190 191 if (flags & IP_CMSG_TOS) { 192 ip_cmsg_recv_tos(msg, skb); 193 194 flags &= ~IP_CMSG_TOS; 195 if (!flags) 196 return; 197 } 198 199 if (flags & IP_CMSG_RECVOPTS) { 200 ip_cmsg_recv_opts(msg, skb); 201 202 flags &= ~IP_CMSG_RECVOPTS; 203 if (!flags) 204 return; 205 } 206 207 if (flags & IP_CMSG_RETOPTS) { 208 ip_cmsg_recv_retopts(sock_net(sk), msg, skb); 209 210 flags &= ~IP_CMSG_RETOPTS; 211 if (!flags) 212 return; 213 } 214 215 if (flags & IP_CMSG_PASSSEC) { 216 ip_cmsg_recv_security(msg, skb); 217 218 flags &= ~IP_CMSG_PASSSEC; 219 if (!flags) 220 return; 221 } 222 223 if (flags & IP_CMSG_ORIGDSTADDR) { 224 ip_cmsg_recv_dstaddr(msg, skb); 225 226 flags &= ~IP_CMSG_ORIGDSTADDR; 227 if (!flags) 228 return; 229 } 230 231 if (flags & IP_CMSG_CHECKSUM) 232 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 233 234 if (flags & IP_CMSG_RECVFRAGSIZE) 235 ip_cmsg_recv_fragsize(msg, skb); 236 } 237 EXPORT_SYMBOL(ip_cmsg_recv_offset); 238 239 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 240 bool allow_ipv6) 241 { 242 int err, val; 243 struct cmsghdr *cmsg; 244 struct net *net = sock_net(sk); 245 246 for_each_cmsghdr(cmsg, msg) { 247 if (!CMSG_OK(msg, cmsg)) 248 return -EINVAL; 249 #if IS_ENABLED(CONFIG_IPV6) 250 if (allow_ipv6 && 251 cmsg->cmsg_level == SOL_IPV6 && 252 cmsg->cmsg_type == IPV6_PKTINFO) { 253 struct in6_pktinfo *src_info; 254 255 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 256 return -EINVAL; 257 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 258 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 259 return -EINVAL; 260 ipc->oif = src_info->ipi6_ifindex; 261 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 262 continue; 263 } 264 #endif 265 if (cmsg->cmsg_level == SOL_SOCKET) { 266 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 267 if (err) 268 return err; 269 continue; 270 } 271 272 if (cmsg->cmsg_level != SOL_IP) 273 continue; 274 switch (cmsg->cmsg_type) { 275 case IP_RETOPTS: 276 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 277 278 /* Our caller is responsible for freeing ipc->opt */ 279 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 280 err < 40 ? err : 40); 281 if (err) 282 return err; 283 break; 284 case IP_PKTINFO: 285 { 286 struct in_pktinfo *info; 287 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 288 return -EINVAL; 289 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 290 ipc->oif = info->ipi_ifindex; 291 ipc->addr = info->ipi_spec_dst.s_addr; 292 break; 293 } 294 case IP_TTL: 295 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 296 return -EINVAL; 297 val = *(int *)CMSG_DATA(cmsg); 298 if (val < 1 || val > 255) 299 return -EINVAL; 300 ipc->ttl = val; 301 break; 302 case IP_TOS: 303 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 304 val = *(int *)CMSG_DATA(cmsg); 305 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 306 val = *(u8 *)CMSG_DATA(cmsg); 307 else 308 return -EINVAL; 309 if (val < 0 || val > 255) 310 return -EINVAL; 311 ipc->tos = val; 312 ipc->priority = rt_tos2priority(ipc->tos); 313 break; 314 315 default: 316 return -EINVAL; 317 } 318 } 319 return 0; 320 } 321 322 323 /* Special input handler for packets caught by router alert option. 324 They are selected only by protocol field, and then processed likely 325 local ones; but only if someone wants them! Otherwise, router 326 not running rsvpd will kill RSVP. 327 328 It is user level problem, what it will make with them. 329 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 330 but receiver should be enough clever f.e. to forward mtrace requests, 331 sent to multicast group to reach destination designated router. 332 */ 333 struct ip_ra_chain __rcu *ip_ra_chain; 334 335 336 static void ip_ra_destroy_rcu(struct rcu_head *head) 337 { 338 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 339 340 sock_put(ra->saved_sk); 341 kfree(ra); 342 } 343 344 int ip_ra_control(struct sock *sk, unsigned char on, 345 void (*destructor)(struct sock *)) 346 { 347 struct ip_ra_chain *ra, *new_ra; 348 struct ip_ra_chain __rcu **rap; 349 350 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 351 return -EINVAL; 352 353 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 354 355 for (rap = &ip_ra_chain; 356 (ra = rtnl_dereference(*rap)) != NULL; 357 rap = &ra->next) { 358 if (ra->sk == sk) { 359 if (on) { 360 kfree(new_ra); 361 return -EADDRINUSE; 362 } 363 /* dont let ip_call_ra_chain() use sk again */ 364 ra->sk = NULL; 365 RCU_INIT_POINTER(*rap, ra->next); 366 367 if (ra->destructor) 368 ra->destructor(sk); 369 /* 370 * Delay sock_put(sk) and kfree(ra) after one rcu grace 371 * period. This guarantee ip_call_ra_chain() dont need 372 * to mess with socket refcounts. 373 */ 374 ra->saved_sk = sk; 375 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 376 return 0; 377 } 378 } 379 if (!new_ra) 380 return -ENOBUFS; 381 new_ra->sk = sk; 382 new_ra->destructor = destructor; 383 384 RCU_INIT_POINTER(new_ra->next, ra); 385 rcu_assign_pointer(*rap, new_ra); 386 sock_hold(sk); 387 388 return 0; 389 } 390 391 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 392 __be16 port, u32 info, u8 *payload) 393 { 394 struct sock_exterr_skb *serr; 395 396 skb = skb_clone(skb, GFP_ATOMIC); 397 if (!skb) 398 return; 399 400 serr = SKB_EXT_ERR(skb); 401 serr->ee.ee_errno = err; 402 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 403 serr->ee.ee_type = icmp_hdr(skb)->type; 404 serr->ee.ee_code = icmp_hdr(skb)->code; 405 serr->ee.ee_pad = 0; 406 serr->ee.ee_info = info; 407 serr->ee.ee_data = 0; 408 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 409 skb_network_header(skb); 410 serr->port = port; 411 412 if (skb_pull(skb, payload - skb->data)) { 413 skb_reset_transport_header(skb); 414 if (sock_queue_err_skb(sk, skb) == 0) 415 return; 416 } 417 kfree_skb(skb); 418 } 419 420 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 421 { 422 struct inet_sock *inet = inet_sk(sk); 423 struct sock_exterr_skb *serr; 424 struct iphdr *iph; 425 struct sk_buff *skb; 426 427 if (!inet->recverr) 428 return; 429 430 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 431 if (!skb) 432 return; 433 434 skb_put(skb, sizeof(struct iphdr)); 435 skb_reset_network_header(skb); 436 iph = ip_hdr(skb); 437 iph->daddr = daddr; 438 439 serr = SKB_EXT_ERR(skb); 440 serr->ee.ee_errno = err; 441 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 442 serr->ee.ee_type = 0; 443 serr->ee.ee_code = 0; 444 serr->ee.ee_pad = 0; 445 serr->ee.ee_info = info; 446 serr->ee.ee_data = 0; 447 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 448 serr->port = port; 449 450 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 451 skb_reset_transport_header(skb); 452 453 if (sock_queue_err_skb(sk, skb)) 454 kfree_skb(skb); 455 } 456 457 /* For some errors we have valid addr_offset even with zero payload and 458 * zero port. Also, addr_offset should be supported if port is set. 459 */ 460 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 461 { 462 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 463 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 464 } 465 466 /* IPv4 supports cmsg on all imcp errors and some timestamps 467 * 468 * Timestamp code paths do not initialize the fields expected by cmsg: 469 * the PKTINFO fields in skb->cb[]. Fill those in here. 470 */ 471 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 472 struct sk_buff *skb, 473 int ee_origin) 474 { 475 struct in_pktinfo *info; 476 477 if (ee_origin == SO_EE_ORIGIN_ICMP) 478 return true; 479 480 if (ee_origin == SO_EE_ORIGIN_LOCAL) 481 return false; 482 483 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 484 * timestamp with egress dev. Not possible for packets without iif 485 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 486 */ 487 info = PKTINFO_SKB_CB(skb); 488 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 489 !info->ipi_ifindex) 490 return false; 491 492 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 493 return true; 494 } 495 496 /* 497 * Handle MSG_ERRQUEUE 498 */ 499 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 500 { 501 struct sock_exterr_skb *serr; 502 struct sk_buff *skb; 503 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 504 struct { 505 struct sock_extended_err ee; 506 struct sockaddr_in offender; 507 } errhdr; 508 int err; 509 int copied; 510 511 WARN_ON_ONCE(sk->sk_family == AF_INET6); 512 513 err = -EAGAIN; 514 skb = sock_dequeue_err_skb(sk); 515 if (!skb) 516 goto out; 517 518 copied = skb->len; 519 if (copied > len) { 520 msg->msg_flags |= MSG_TRUNC; 521 copied = len; 522 } 523 err = skb_copy_datagram_msg(skb, 0, msg, copied); 524 if (unlikely(err)) { 525 kfree_skb(skb); 526 return err; 527 } 528 sock_recv_timestamp(msg, sk, skb); 529 530 serr = SKB_EXT_ERR(skb); 531 532 if (sin && ipv4_datagram_support_addr(serr)) { 533 sin->sin_family = AF_INET; 534 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 535 serr->addr_offset); 536 sin->sin_port = serr->port; 537 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 538 *addr_len = sizeof(*sin); 539 } 540 541 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 542 sin = &errhdr.offender; 543 memset(sin, 0, sizeof(*sin)); 544 545 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 546 sin->sin_family = AF_INET; 547 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 548 if (inet_sk(sk)->cmsg_flags) 549 ip_cmsg_recv(msg, skb); 550 } 551 552 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 553 554 /* Now we could try to dump offended packet options */ 555 556 msg->msg_flags |= MSG_ERRQUEUE; 557 err = copied; 558 559 consume_skb(skb); 560 out: 561 return err; 562 } 563 564 565 /* 566 * Socket option code for IP. This is the end of the line after any 567 * TCP,UDP etc options on an IP socket. 568 */ 569 static bool setsockopt_needs_rtnl(int optname) 570 { 571 switch (optname) { 572 case IP_ADD_MEMBERSHIP: 573 case IP_ADD_SOURCE_MEMBERSHIP: 574 case IP_BLOCK_SOURCE: 575 case IP_DROP_MEMBERSHIP: 576 case IP_DROP_SOURCE_MEMBERSHIP: 577 case IP_MSFILTER: 578 case IP_UNBLOCK_SOURCE: 579 case MCAST_BLOCK_SOURCE: 580 case MCAST_MSFILTER: 581 case MCAST_JOIN_GROUP: 582 case MCAST_JOIN_SOURCE_GROUP: 583 case MCAST_LEAVE_GROUP: 584 case MCAST_LEAVE_SOURCE_GROUP: 585 case MCAST_UNBLOCK_SOURCE: 586 case IP_ROUTER_ALERT: 587 return true; 588 } 589 return false; 590 } 591 592 static int do_ip_setsockopt(struct sock *sk, int level, 593 int optname, char __user *optval, unsigned int optlen) 594 { 595 struct inet_sock *inet = inet_sk(sk); 596 struct net *net = sock_net(sk); 597 int val = 0, err; 598 bool needs_rtnl = setsockopt_needs_rtnl(optname); 599 600 switch (optname) { 601 case IP_PKTINFO: 602 case IP_RECVTTL: 603 case IP_RECVOPTS: 604 case IP_RECVTOS: 605 case IP_RETOPTS: 606 case IP_TOS: 607 case IP_TTL: 608 case IP_HDRINCL: 609 case IP_MTU_DISCOVER: 610 case IP_RECVERR: 611 case IP_ROUTER_ALERT: 612 case IP_FREEBIND: 613 case IP_PASSSEC: 614 case IP_TRANSPARENT: 615 case IP_MINTTL: 616 case IP_NODEFRAG: 617 case IP_BIND_ADDRESS_NO_PORT: 618 case IP_UNICAST_IF: 619 case IP_MULTICAST_TTL: 620 case IP_MULTICAST_ALL: 621 case IP_MULTICAST_LOOP: 622 case IP_RECVORIGDSTADDR: 623 case IP_CHECKSUM: 624 case IP_RECVFRAGSIZE: 625 if (optlen >= sizeof(int)) { 626 if (get_user(val, (int __user *) optval)) 627 return -EFAULT; 628 } else if (optlen >= sizeof(char)) { 629 unsigned char ucval; 630 631 if (get_user(ucval, (unsigned char __user *) optval)) 632 return -EFAULT; 633 val = (int) ucval; 634 } 635 } 636 637 /* If optlen==0, it is equivalent to val == 0 */ 638 639 if (ip_mroute_opt(optname)) 640 return ip_mroute_setsockopt(sk, optname, optval, optlen); 641 642 err = 0; 643 if (needs_rtnl) 644 rtnl_lock(); 645 lock_sock(sk); 646 647 switch (optname) { 648 case IP_OPTIONS: 649 { 650 struct ip_options_rcu *old, *opt = NULL; 651 652 if (optlen > 40) 653 goto e_inval; 654 err = ip_options_get_from_user(sock_net(sk), &opt, 655 optval, optlen); 656 if (err) 657 break; 658 old = rcu_dereference_protected(inet->inet_opt, 659 lockdep_sock_is_held(sk)); 660 if (inet->is_icsk) { 661 struct inet_connection_sock *icsk = inet_csk(sk); 662 #if IS_ENABLED(CONFIG_IPV6) 663 if (sk->sk_family == PF_INET || 664 (!((1 << sk->sk_state) & 665 (TCPF_LISTEN | TCPF_CLOSE)) && 666 inet->inet_daddr != LOOPBACK4_IPV6)) { 667 #endif 668 if (old) 669 icsk->icsk_ext_hdr_len -= old->opt.optlen; 670 if (opt) 671 icsk->icsk_ext_hdr_len += opt->opt.optlen; 672 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 673 #if IS_ENABLED(CONFIG_IPV6) 674 } 675 #endif 676 } 677 rcu_assign_pointer(inet->inet_opt, opt); 678 if (old) 679 kfree_rcu(old, rcu); 680 break; 681 } 682 case IP_PKTINFO: 683 if (val) 684 inet->cmsg_flags |= IP_CMSG_PKTINFO; 685 else 686 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 687 break; 688 case IP_RECVTTL: 689 if (val) 690 inet->cmsg_flags |= IP_CMSG_TTL; 691 else 692 inet->cmsg_flags &= ~IP_CMSG_TTL; 693 break; 694 case IP_RECVTOS: 695 if (val) 696 inet->cmsg_flags |= IP_CMSG_TOS; 697 else 698 inet->cmsg_flags &= ~IP_CMSG_TOS; 699 break; 700 case IP_RECVOPTS: 701 if (val) 702 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 703 else 704 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 705 break; 706 case IP_RETOPTS: 707 if (val) 708 inet->cmsg_flags |= IP_CMSG_RETOPTS; 709 else 710 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 711 break; 712 case IP_PASSSEC: 713 if (val) 714 inet->cmsg_flags |= IP_CMSG_PASSSEC; 715 else 716 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 717 break; 718 case IP_RECVORIGDSTADDR: 719 if (val) 720 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 721 else 722 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 723 break; 724 case IP_CHECKSUM: 725 if (val) { 726 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 727 inet_inc_convert_csum(sk); 728 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 729 } 730 } else { 731 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 732 inet_dec_convert_csum(sk); 733 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 734 } 735 } 736 break; 737 case IP_RECVFRAGSIZE: 738 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 739 goto e_inval; 740 if (val) 741 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 742 else 743 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 744 break; 745 case IP_TOS: /* This sets both TOS and Precedence */ 746 if (sk->sk_type == SOCK_STREAM) { 747 val &= ~INET_ECN_MASK; 748 val |= inet->tos & INET_ECN_MASK; 749 } 750 if (inet->tos != val) { 751 inet->tos = val; 752 sk->sk_priority = rt_tos2priority(val); 753 sk_dst_reset(sk); 754 } 755 break; 756 case IP_TTL: 757 if (optlen < 1) 758 goto e_inval; 759 if (val != -1 && (val < 1 || val > 255)) 760 goto e_inval; 761 inet->uc_ttl = val; 762 break; 763 case IP_HDRINCL: 764 if (sk->sk_type != SOCK_RAW) { 765 err = -ENOPROTOOPT; 766 break; 767 } 768 inet->hdrincl = val ? 1 : 0; 769 break; 770 case IP_NODEFRAG: 771 if (sk->sk_type != SOCK_RAW) { 772 err = -ENOPROTOOPT; 773 break; 774 } 775 inet->nodefrag = val ? 1 : 0; 776 break; 777 case IP_BIND_ADDRESS_NO_PORT: 778 inet->bind_address_no_port = val ? 1 : 0; 779 break; 780 case IP_MTU_DISCOVER: 781 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 782 goto e_inval; 783 inet->pmtudisc = val; 784 break; 785 case IP_RECVERR: 786 inet->recverr = !!val; 787 if (!val) 788 skb_queue_purge(&sk->sk_error_queue); 789 break; 790 case IP_MULTICAST_TTL: 791 if (sk->sk_type == SOCK_STREAM) 792 goto e_inval; 793 if (optlen < 1) 794 goto e_inval; 795 if (val == -1) 796 val = 1; 797 if (val < 0 || val > 255) 798 goto e_inval; 799 inet->mc_ttl = val; 800 break; 801 case IP_MULTICAST_LOOP: 802 if (optlen < 1) 803 goto e_inval; 804 inet->mc_loop = !!val; 805 break; 806 case IP_UNICAST_IF: 807 { 808 struct net_device *dev = NULL; 809 int ifindex; 810 811 if (optlen != sizeof(int)) 812 goto e_inval; 813 814 ifindex = (__force int)ntohl((__force __be32)val); 815 if (ifindex == 0) { 816 inet->uc_index = 0; 817 err = 0; 818 break; 819 } 820 821 dev = dev_get_by_index(sock_net(sk), ifindex); 822 err = -EADDRNOTAVAIL; 823 if (!dev) 824 break; 825 dev_put(dev); 826 827 err = -EINVAL; 828 if (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 case IP_ROUTER_ALERT: 1146 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1147 break; 1148 1149 case IP_FREEBIND: 1150 if (optlen < 1) 1151 goto e_inval; 1152 inet->freebind = !!val; 1153 break; 1154 1155 case IP_IPSEC_POLICY: 1156 case IP_XFRM_POLICY: 1157 err = -EPERM; 1158 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1159 break; 1160 err = xfrm_user_policy(sk, optname, optval, optlen); 1161 break; 1162 1163 case IP_TRANSPARENT: 1164 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1165 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1166 err = -EPERM; 1167 break; 1168 } 1169 if (optlen < 1) 1170 goto e_inval; 1171 inet->transparent = !!val; 1172 break; 1173 1174 case IP_MINTTL: 1175 if (optlen < 1) 1176 goto e_inval; 1177 if (val < 0 || val > 255) 1178 goto e_inval; 1179 inet->min_ttl = val; 1180 break; 1181 1182 default: 1183 err = -ENOPROTOOPT; 1184 break; 1185 } 1186 release_sock(sk); 1187 if (needs_rtnl) 1188 rtnl_unlock(); 1189 return err; 1190 1191 e_inval: 1192 release_sock(sk); 1193 if (needs_rtnl) 1194 rtnl_unlock(); 1195 return -EINVAL; 1196 } 1197 1198 /** 1199 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1200 * @sk: socket 1201 * @skb: buffer 1202 * 1203 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1204 * destination in skb->cb[] before dst drop. 1205 * This way, receiver doesn't make cache line misses to read rtable. 1206 */ 1207 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1208 { 1209 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1210 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1211 ipv6_sk_rxinfo(sk); 1212 1213 if (prepare && skb_rtable(skb)) { 1214 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1215 * which has interface index (iif) as the first member of the 1216 * underlying inet{6}_skb_parm struct. This code then overlays 1217 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1218 * element so the iif is picked up from the prior IPCB. If iif 1219 * is the loopback interface, then return the sending interface 1220 * (e.g., process binds socket to eth0 for Tx which is 1221 * redirected to loopback in the rtable/dst). 1222 */ 1223 struct rtable *rt = skb_rtable(skb); 1224 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1225 1226 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1227 pktinfo->ipi_ifindex = inet_iif(skb); 1228 else if (l3slave && rt && rt->rt_iif) 1229 pktinfo->ipi_ifindex = rt->rt_iif; 1230 1231 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1232 } else { 1233 pktinfo->ipi_ifindex = 0; 1234 pktinfo->ipi_spec_dst.s_addr = 0; 1235 } 1236 skb_dst_drop(skb); 1237 } 1238 1239 int ip_setsockopt(struct sock *sk, int level, 1240 int optname, char __user *optval, unsigned int optlen) 1241 { 1242 int err; 1243 1244 if (level != SOL_IP) 1245 return -ENOPROTOOPT; 1246 1247 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1248 #ifdef CONFIG_NETFILTER 1249 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1250 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1251 optname != IP_IPSEC_POLICY && 1252 optname != IP_XFRM_POLICY && 1253 !ip_mroute_opt(optname)) { 1254 lock_sock(sk); 1255 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1256 release_sock(sk); 1257 } 1258 #endif 1259 return err; 1260 } 1261 EXPORT_SYMBOL(ip_setsockopt); 1262 1263 #ifdef CONFIG_COMPAT 1264 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1265 char __user *optval, unsigned int optlen) 1266 { 1267 int err; 1268 1269 if (level != SOL_IP) 1270 return -ENOPROTOOPT; 1271 1272 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1273 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1274 ip_setsockopt); 1275 1276 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1277 #ifdef CONFIG_NETFILTER 1278 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1279 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1280 optname != IP_IPSEC_POLICY && 1281 optname != IP_XFRM_POLICY && 1282 !ip_mroute_opt(optname)) { 1283 lock_sock(sk); 1284 err = compat_nf_setsockopt(sk, PF_INET, optname, 1285 optval, optlen); 1286 release_sock(sk); 1287 } 1288 #endif 1289 return err; 1290 } 1291 EXPORT_SYMBOL(compat_ip_setsockopt); 1292 #endif 1293 1294 /* 1295 * Get the options. Note for future reference. The GET of IP options gets 1296 * the _received_ ones. The set sets the _sent_ ones. 1297 */ 1298 1299 static bool getsockopt_needs_rtnl(int optname) 1300 { 1301 switch (optname) { 1302 case IP_MSFILTER: 1303 case MCAST_MSFILTER: 1304 return true; 1305 } 1306 return false; 1307 } 1308 1309 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1310 char __user *optval, int __user *optlen, unsigned int flags) 1311 { 1312 struct inet_sock *inet = inet_sk(sk); 1313 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1314 int val, err = 0; 1315 int len; 1316 1317 if (level != SOL_IP) 1318 return -EOPNOTSUPP; 1319 1320 if (ip_mroute_opt(optname)) 1321 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1322 1323 if (get_user(len, optlen)) 1324 return -EFAULT; 1325 if (len < 0) 1326 return -EINVAL; 1327 1328 if (needs_rtnl) 1329 rtnl_lock(); 1330 lock_sock(sk); 1331 1332 switch (optname) { 1333 case IP_OPTIONS: 1334 { 1335 unsigned char optbuf[sizeof(struct ip_options)+40]; 1336 struct ip_options *opt = (struct ip_options *)optbuf; 1337 struct ip_options_rcu *inet_opt; 1338 1339 inet_opt = rcu_dereference_protected(inet->inet_opt, 1340 lockdep_sock_is_held(sk)); 1341 opt->optlen = 0; 1342 if (inet_opt) 1343 memcpy(optbuf, &inet_opt->opt, 1344 sizeof(struct ip_options) + 1345 inet_opt->opt.optlen); 1346 release_sock(sk); 1347 1348 if (opt->optlen == 0) 1349 return put_user(0, optlen); 1350 1351 ip_options_undo(opt); 1352 1353 len = min_t(unsigned int, len, opt->optlen); 1354 if (put_user(len, optlen)) 1355 return -EFAULT; 1356 if (copy_to_user(optval, opt->__data, len)) 1357 return -EFAULT; 1358 return 0; 1359 } 1360 case IP_PKTINFO: 1361 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1362 break; 1363 case IP_RECVTTL: 1364 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1365 break; 1366 case IP_RECVTOS: 1367 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1368 break; 1369 case IP_RECVOPTS: 1370 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1371 break; 1372 case IP_RETOPTS: 1373 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1374 break; 1375 case IP_PASSSEC: 1376 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1377 break; 1378 case IP_RECVORIGDSTADDR: 1379 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1380 break; 1381 case IP_CHECKSUM: 1382 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1383 break; 1384 case IP_RECVFRAGSIZE: 1385 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1386 break; 1387 case IP_TOS: 1388 val = inet->tos; 1389 break; 1390 case IP_TTL: 1391 { 1392 struct net *net = sock_net(sk); 1393 val = (inet->uc_ttl == -1 ? 1394 net->ipv4.sysctl_ip_default_ttl : 1395 inet->uc_ttl); 1396 break; 1397 } 1398 case IP_HDRINCL: 1399 val = inet->hdrincl; 1400 break; 1401 case IP_NODEFRAG: 1402 val = inet->nodefrag; 1403 break; 1404 case IP_BIND_ADDRESS_NO_PORT: 1405 val = inet->bind_address_no_port; 1406 break; 1407 case IP_MTU_DISCOVER: 1408 val = inet->pmtudisc; 1409 break; 1410 case IP_MTU: 1411 { 1412 struct dst_entry *dst; 1413 val = 0; 1414 dst = sk_dst_get(sk); 1415 if (dst) { 1416 val = dst_mtu(dst); 1417 dst_release(dst); 1418 } 1419 if (!val) { 1420 release_sock(sk); 1421 return -ENOTCONN; 1422 } 1423 break; 1424 } 1425 case IP_RECVERR: 1426 val = inet->recverr; 1427 break; 1428 case IP_MULTICAST_TTL: 1429 val = inet->mc_ttl; 1430 break; 1431 case IP_MULTICAST_LOOP: 1432 val = inet->mc_loop; 1433 break; 1434 case IP_UNICAST_IF: 1435 val = (__force int)htonl((__u32) inet->uc_index); 1436 break; 1437 case IP_MULTICAST_IF: 1438 { 1439 struct in_addr addr; 1440 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1441 addr.s_addr = inet->mc_addr; 1442 release_sock(sk); 1443 1444 if (put_user(len, optlen)) 1445 return -EFAULT; 1446 if (copy_to_user(optval, &addr, len)) 1447 return -EFAULT; 1448 return 0; 1449 } 1450 case IP_MSFILTER: 1451 { 1452 struct ip_msfilter msf; 1453 1454 if (len < IP_MSFILTER_SIZE(0)) { 1455 err = -EINVAL; 1456 goto out; 1457 } 1458 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1459 err = -EFAULT; 1460 goto out; 1461 } 1462 err = ip_mc_msfget(sk, &msf, 1463 (struct ip_msfilter __user *)optval, optlen); 1464 goto out; 1465 } 1466 case MCAST_MSFILTER: 1467 { 1468 struct group_filter gsf; 1469 1470 if (len < GROUP_FILTER_SIZE(0)) { 1471 err = -EINVAL; 1472 goto out; 1473 } 1474 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1475 err = -EFAULT; 1476 goto out; 1477 } 1478 err = ip_mc_gsfget(sk, &gsf, 1479 (struct group_filter __user *)optval, 1480 optlen); 1481 goto out; 1482 } 1483 case IP_MULTICAST_ALL: 1484 val = inet->mc_all; 1485 break; 1486 case IP_PKTOPTIONS: 1487 { 1488 struct msghdr msg; 1489 1490 release_sock(sk); 1491 1492 if (sk->sk_type != SOCK_STREAM) 1493 return -ENOPROTOOPT; 1494 1495 msg.msg_control = (__force void *) optval; 1496 msg.msg_controllen = len; 1497 msg.msg_flags = flags; 1498 1499 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1500 struct in_pktinfo info; 1501 1502 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1503 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1504 info.ipi_ifindex = inet->mc_index; 1505 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1506 } 1507 if (inet->cmsg_flags & IP_CMSG_TTL) { 1508 int hlim = inet->mc_ttl; 1509 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1510 } 1511 if (inet->cmsg_flags & IP_CMSG_TOS) { 1512 int tos = inet->rcv_tos; 1513 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1514 } 1515 len -= msg.msg_controllen; 1516 return put_user(len, optlen); 1517 } 1518 case IP_FREEBIND: 1519 val = inet->freebind; 1520 break; 1521 case IP_TRANSPARENT: 1522 val = inet->transparent; 1523 break; 1524 case IP_MINTTL: 1525 val = inet->min_ttl; 1526 break; 1527 default: 1528 release_sock(sk); 1529 return -ENOPROTOOPT; 1530 } 1531 release_sock(sk); 1532 1533 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1534 unsigned char ucval = (unsigned char)val; 1535 len = 1; 1536 if (put_user(len, optlen)) 1537 return -EFAULT; 1538 if (copy_to_user(optval, &ucval, 1)) 1539 return -EFAULT; 1540 } else { 1541 len = min_t(unsigned int, sizeof(int), len); 1542 if (put_user(len, optlen)) 1543 return -EFAULT; 1544 if (copy_to_user(optval, &val, len)) 1545 return -EFAULT; 1546 } 1547 return 0; 1548 1549 out: 1550 release_sock(sk); 1551 if (needs_rtnl) 1552 rtnl_unlock(); 1553 return err; 1554 } 1555 1556 int ip_getsockopt(struct sock *sk, int level, 1557 int optname, char __user *optval, int __user *optlen) 1558 { 1559 int err; 1560 1561 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1562 #ifdef CONFIG_NETFILTER 1563 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1564 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1565 !ip_mroute_opt(optname)) { 1566 int len; 1567 1568 if (get_user(len, optlen)) 1569 return -EFAULT; 1570 1571 lock_sock(sk); 1572 err = nf_getsockopt(sk, PF_INET, optname, optval, 1573 &len); 1574 release_sock(sk); 1575 if (err >= 0) 1576 err = put_user(len, optlen); 1577 return err; 1578 } 1579 #endif 1580 return err; 1581 } 1582 EXPORT_SYMBOL(ip_getsockopt); 1583 1584 #ifdef CONFIG_COMPAT 1585 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1586 char __user *optval, int __user *optlen) 1587 { 1588 int err; 1589 1590 if (optname == MCAST_MSFILTER) 1591 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1592 ip_getsockopt); 1593 1594 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1595 MSG_CMSG_COMPAT); 1596 1597 #ifdef CONFIG_NETFILTER 1598 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1599 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1600 !ip_mroute_opt(optname)) { 1601 int len; 1602 1603 if (get_user(len, optlen)) 1604 return -EFAULT; 1605 1606 lock_sock(sk); 1607 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1608 release_sock(sk); 1609 if (err >= 0) 1610 err = put_user(len, optlen); 1611 return err; 1612 } 1613 #endif 1614 return err; 1615 } 1616 EXPORT_SYMBOL(compat_ip_getsockopt); 1617 #endif 1618