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 #include <linux/bpfilter.h> 51 52 /* 53 * SOL_IP control messages. 54 */ 55 56 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 57 { 58 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 59 60 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 61 62 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 63 } 64 65 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 66 { 67 int ttl = ip_hdr(skb)->ttl; 68 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 69 } 70 71 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 72 { 73 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 74 } 75 76 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 77 { 78 if (IPCB(skb)->opt.optlen == 0) 79 return; 80 81 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 82 ip_hdr(skb) + 1); 83 } 84 85 86 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, 87 struct sk_buff *skb) 88 { 89 unsigned char optbuf[sizeof(struct ip_options) + 40]; 90 struct ip_options *opt = (struct ip_options *)optbuf; 91 92 if (IPCB(skb)->opt.optlen == 0) 93 return; 94 95 if (ip_options_echo(net, opt, skb)) { 96 msg->msg_flags |= MSG_CTRUNC; 97 return; 98 } 99 ip_options_undo(opt); 100 101 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 102 } 103 104 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) 105 { 106 int val; 107 108 if (IPCB(skb)->frag_max_size == 0) 109 return; 110 111 val = IPCB(skb)->frag_max_size; 112 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 113 } 114 115 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 116 int tlen, int offset) 117 { 118 __wsum csum = skb->csum; 119 120 if (skb->ip_summed != CHECKSUM_COMPLETE) 121 return; 122 123 if (offset != 0) { 124 int tend_off = skb_transport_offset(skb) + tlen; 125 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 126 } 127 128 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 129 } 130 131 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 132 { 133 char *secdata; 134 u32 seclen, secid; 135 int err; 136 137 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 138 if (err) 139 return; 140 141 err = security_secid_to_secctx(secid, &secdata, &seclen); 142 if (err) 143 return; 144 145 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 146 security_release_secctx(secdata, seclen); 147 } 148 149 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 150 { 151 struct sockaddr_in sin; 152 const struct iphdr *iph = ip_hdr(skb); 153 __be16 *ports; 154 int end; 155 156 end = skb_transport_offset(skb) + 4; 157 if (end > 0 && !pskb_may_pull(skb, end)) 158 return; 159 160 /* All current transport protocols have the port numbers in the 161 * first four bytes of the transport header and this function is 162 * written with this assumption in mind. 163 */ 164 ports = (__be16 *)skb_transport_header(skb); 165 166 sin.sin_family = AF_INET; 167 sin.sin_addr.s_addr = iph->daddr; 168 sin.sin_port = ports[1]; 169 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 170 171 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 172 } 173 174 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 175 struct sk_buff *skb, int tlen, int offset) 176 { 177 struct inet_sock *inet = inet_sk(sk); 178 unsigned int flags = inet->cmsg_flags; 179 180 /* Ordered by supposed usage frequency */ 181 if (flags & IP_CMSG_PKTINFO) { 182 ip_cmsg_recv_pktinfo(msg, skb); 183 184 flags &= ~IP_CMSG_PKTINFO; 185 if (!flags) 186 return; 187 } 188 189 if (flags & IP_CMSG_TTL) { 190 ip_cmsg_recv_ttl(msg, skb); 191 192 flags &= ~IP_CMSG_TTL; 193 if (!flags) 194 return; 195 } 196 197 if (flags & IP_CMSG_TOS) { 198 ip_cmsg_recv_tos(msg, skb); 199 200 flags &= ~IP_CMSG_TOS; 201 if (!flags) 202 return; 203 } 204 205 if (flags & IP_CMSG_RECVOPTS) { 206 ip_cmsg_recv_opts(msg, skb); 207 208 flags &= ~IP_CMSG_RECVOPTS; 209 if (!flags) 210 return; 211 } 212 213 if (flags & IP_CMSG_RETOPTS) { 214 ip_cmsg_recv_retopts(sock_net(sk), msg, skb); 215 216 flags &= ~IP_CMSG_RETOPTS; 217 if (!flags) 218 return; 219 } 220 221 if (flags & IP_CMSG_PASSSEC) { 222 ip_cmsg_recv_security(msg, skb); 223 224 flags &= ~IP_CMSG_PASSSEC; 225 if (!flags) 226 return; 227 } 228 229 if (flags & IP_CMSG_ORIGDSTADDR) { 230 ip_cmsg_recv_dstaddr(msg, skb); 231 232 flags &= ~IP_CMSG_ORIGDSTADDR; 233 if (!flags) 234 return; 235 } 236 237 if (flags & IP_CMSG_CHECKSUM) 238 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 239 240 if (flags & IP_CMSG_RECVFRAGSIZE) 241 ip_cmsg_recv_fragsize(msg, skb); 242 } 243 EXPORT_SYMBOL(ip_cmsg_recv_offset); 244 245 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 246 bool allow_ipv6) 247 { 248 int err, val; 249 struct cmsghdr *cmsg; 250 struct net *net = sock_net(sk); 251 252 for_each_cmsghdr(cmsg, msg) { 253 if (!CMSG_OK(msg, cmsg)) 254 return -EINVAL; 255 #if IS_ENABLED(CONFIG_IPV6) 256 if (allow_ipv6 && 257 cmsg->cmsg_level == SOL_IPV6 && 258 cmsg->cmsg_type == IPV6_PKTINFO) { 259 struct in6_pktinfo *src_info; 260 261 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 262 return -EINVAL; 263 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 264 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 265 return -EINVAL; 266 if (src_info->ipi6_ifindex) 267 ipc->oif = src_info->ipi6_ifindex; 268 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 269 continue; 270 } 271 #endif 272 if (cmsg->cmsg_level == SOL_SOCKET) { 273 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 274 if (err) 275 return err; 276 continue; 277 } 278 279 if (cmsg->cmsg_level != SOL_IP) 280 continue; 281 switch (cmsg->cmsg_type) { 282 case IP_RETOPTS: 283 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 284 285 /* Our caller is responsible for freeing ipc->opt */ 286 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 287 err < 40 ? err : 40); 288 if (err) 289 return err; 290 break; 291 case IP_PKTINFO: 292 { 293 struct in_pktinfo *info; 294 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 295 return -EINVAL; 296 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 297 if (info->ipi_ifindex) 298 ipc->oif = info->ipi_ifindex; 299 ipc->addr = info->ipi_spec_dst.s_addr; 300 break; 301 } 302 case IP_TTL: 303 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 304 return -EINVAL; 305 val = *(int *)CMSG_DATA(cmsg); 306 if (val < 1 || val > 255) 307 return -EINVAL; 308 ipc->ttl = val; 309 break; 310 case IP_TOS: 311 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 312 val = *(int *)CMSG_DATA(cmsg); 313 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 314 val = *(u8 *)CMSG_DATA(cmsg); 315 else 316 return -EINVAL; 317 if (val < 0 || val > 255) 318 return -EINVAL; 319 ipc->tos = val; 320 ipc->priority = rt_tos2priority(ipc->tos); 321 break; 322 323 default: 324 return -EINVAL; 325 } 326 } 327 return 0; 328 } 329 330 static void ip_ra_destroy_rcu(struct rcu_head *head) 331 { 332 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 333 334 sock_put(ra->saved_sk); 335 kfree(ra); 336 } 337 338 int ip_ra_control(struct sock *sk, unsigned char on, 339 void (*destructor)(struct sock *)) 340 { 341 struct ip_ra_chain *ra, *new_ra; 342 struct ip_ra_chain __rcu **rap; 343 struct net *net = sock_net(sk); 344 345 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 346 return -EINVAL; 347 348 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 349 350 mutex_lock(&net->ipv4.ra_mutex); 351 for (rap = &net->ipv4.ra_chain; 352 (ra = rcu_dereference_protected(*rap, 353 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; 354 rap = &ra->next) { 355 if (ra->sk == sk) { 356 if (on) { 357 mutex_unlock(&net->ipv4.ra_mutex); 358 kfree(new_ra); 359 return -EADDRINUSE; 360 } 361 /* dont let ip_call_ra_chain() use sk again */ 362 ra->sk = NULL; 363 RCU_INIT_POINTER(*rap, ra->next); 364 mutex_unlock(&net->ipv4.ra_mutex); 365 366 if (ra->destructor) 367 ra->destructor(sk); 368 /* 369 * Delay sock_put(sk) and kfree(ra) after one rcu grace 370 * period. This guarantee ip_call_ra_chain() dont need 371 * to mess with socket refcounts. 372 */ 373 ra->saved_sk = sk; 374 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 375 return 0; 376 } 377 } 378 if (!new_ra) { 379 mutex_unlock(&net->ipv4.ra_mutex); 380 return -ENOBUFS; 381 } 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 mutex_unlock(&net->ipv4.ra_mutex); 389 390 return 0; 391 } 392 393 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 394 __be16 port, u32 info, u8 *payload) 395 { 396 struct sock_exterr_skb *serr; 397 398 skb = skb_clone(skb, GFP_ATOMIC); 399 if (!skb) 400 return; 401 402 serr = SKB_EXT_ERR(skb); 403 serr->ee.ee_errno = err; 404 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 405 serr->ee.ee_type = icmp_hdr(skb)->type; 406 serr->ee.ee_code = icmp_hdr(skb)->code; 407 serr->ee.ee_pad = 0; 408 serr->ee.ee_info = info; 409 serr->ee.ee_data = 0; 410 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 411 skb_network_header(skb); 412 serr->port = port; 413 414 if (skb_pull(skb, payload - skb->data)) { 415 skb_reset_transport_header(skb); 416 if (sock_queue_err_skb(sk, skb) == 0) 417 return; 418 } 419 kfree_skb(skb); 420 } 421 422 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 423 { 424 struct inet_sock *inet = inet_sk(sk); 425 struct sock_exterr_skb *serr; 426 struct iphdr *iph; 427 struct sk_buff *skb; 428 429 if (!inet->recverr) 430 return; 431 432 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 433 if (!skb) 434 return; 435 436 skb_put(skb, sizeof(struct iphdr)); 437 skb_reset_network_header(skb); 438 iph = ip_hdr(skb); 439 iph->daddr = daddr; 440 441 serr = SKB_EXT_ERR(skb); 442 serr->ee.ee_errno = err; 443 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 444 serr->ee.ee_type = 0; 445 serr->ee.ee_code = 0; 446 serr->ee.ee_pad = 0; 447 serr->ee.ee_info = info; 448 serr->ee.ee_data = 0; 449 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 450 serr->port = port; 451 452 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 453 skb_reset_transport_header(skb); 454 455 if (sock_queue_err_skb(sk, skb)) 456 kfree_skb(skb); 457 } 458 459 /* For some errors we have valid addr_offset even with zero payload and 460 * zero port. Also, addr_offset should be supported if port is set. 461 */ 462 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 463 { 464 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 465 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 466 } 467 468 /* IPv4 supports cmsg on all imcp errors and some timestamps 469 * 470 * Timestamp code paths do not initialize the fields expected by cmsg: 471 * the PKTINFO fields in skb->cb[]. Fill those in here. 472 */ 473 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 474 struct sk_buff *skb, 475 int ee_origin) 476 { 477 struct in_pktinfo *info; 478 479 if (ee_origin == SO_EE_ORIGIN_ICMP) 480 return true; 481 482 if (ee_origin == SO_EE_ORIGIN_LOCAL) 483 return false; 484 485 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 486 * timestamp with egress dev. Not possible for packets without iif 487 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 488 */ 489 info = PKTINFO_SKB_CB(skb); 490 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 491 !info->ipi_ifindex) 492 return false; 493 494 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 495 return true; 496 } 497 498 /* 499 * Handle MSG_ERRQUEUE 500 */ 501 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 502 { 503 struct sock_exterr_skb *serr; 504 struct sk_buff *skb; 505 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 506 struct { 507 struct sock_extended_err ee; 508 struct sockaddr_in offender; 509 } errhdr; 510 int err; 511 int copied; 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 return true; 587 } 588 return false; 589 } 590 591 static int do_ip_setsockopt(struct sock *sk, int level, 592 int optname, char __user *optval, unsigned int optlen) 593 { 594 struct inet_sock *inet = inet_sk(sk); 595 struct net *net = sock_net(sk); 596 int val = 0, err; 597 bool needs_rtnl = setsockopt_needs_rtnl(optname); 598 599 switch (optname) { 600 case IP_PKTINFO: 601 case IP_RECVTTL: 602 case IP_RECVOPTS: 603 case IP_RECVTOS: 604 case IP_RETOPTS: 605 case IP_TOS: 606 case IP_TTL: 607 case IP_HDRINCL: 608 case IP_MTU_DISCOVER: 609 case IP_RECVERR: 610 case IP_ROUTER_ALERT: 611 case IP_FREEBIND: 612 case IP_PASSSEC: 613 case IP_TRANSPARENT: 614 case IP_MINTTL: 615 case IP_NODEFRAG: 616 case IP_BIND_ADDRESS_NO_PORT: 617 case IP_UNICAST_IF: 618 case IP_MULTICAST_TTL: 619 case IP_MULTICAST_ALL: 620 case IP_MULTICAST_LOOP: 621 case IP_RECVORIGDSTADDR: 622 case IP_CHECKSUM: 623 case IP_RECVFRAGSIZE: 624 if (optlen >= sizeof(int)) { 625 if (get_user(val, (int __user *) optval)) 626 return -EFAULT; 627 } else if (optlen >= sizeof(char)) { 628 unsigned char ucval; 629 630 if (get_user(ucval, (unsigned char __user *) optval)) 631 return -EFAULT; 632 val = (int) ucval; 633 } 634 } 635 636 /* If optlen==0, it is equivalent to val == 0 */ 637 638 if (optname == IP_ROUTER_ALERT) 639 return ip_ra_control(sk, val ? 1 : 0, NULL); 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 int midx; 812 813 if (optlen != sizeof(int)) 814 goto e_inval; 815 816 ifindex = (__force int)ntohl((__force __be32)val); 817 if (ifindex == 0) { 818 inet->uc_index = 0; 819 err = 0; 820 break; 821 } 822 823 dev = dev_get_by_index(sock_net(sk), ifindex); 824 err = -EADDRNOTAVAIL; 825 if (!dev) 826 break; 827 828 midx = l3mdev_master_ifindex(dev); 829 dev_put(dev); 830 831 err = -EINVAL; 832 if (sk->sk_bound_dev_if && 833 (!midx || midx != sk->sk_bound_dev_if)) 834 break; 835 836 inet->uc_index = ifindex; 837 err = 0; 838 break; 839 } 840 case IP_MULTICAST_IF: 841 { 842 struct ip_mreqn mreq; 843 struct net_device *dev = NULL; 844 int midx; 845 846 if (sk->sk_type == SOCK_STREAM) 847 goto e_inval; 848 /* 849 * Check the arguments are allowable 850 */ 851 852 if (optlen < sizeof(struct in_addr)) 853 goto e_inval; 854 855 err = -EFAULT; 856 if (optlen >= sizeof(struct ip_mreqn)) { 857 if (copy_from_user(&mreq, optval, sizeof(mreq))) 858 break; 859 } else { 860 memset(&mreq, 0, sizeof(mreq)); 861 if (optlen >= sizeof(struct ip_mreq)) { 862 if (copy_from_user(&mreq, optval, 863 sizeof(struct ip_mreq))) 864 break; 865 } else if (optlen >= sizeof(struct in_addr)) { 866 if (copy_from_user(&mreq.imr_address, optval, 867 sizeof(struct in_addr))) 868 break; 869 } 870 } 871 872 if (!mreq.imr_ifindex) { 873 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 874 inet->mc_index = 0; 875 inet->mc_addr = 0; 876 err = 0; 877 break; 878 } 879 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 880 if (dev) 881 mreq.imr_ifindex = dev->ifindex; 882 } else 883 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 884 885 886 err = -EADDRNOTAVAIL; 887 if (!dev) 888 break; 889 890 midx = l3mdev_master_ifindex(dev); 891 892 dev_put(dev); 893 894 err = -EINVAL; 895 if (sk->sk_bound_dev_if && 896 mreq.imr_ifindex != sk->sk_bound_dev_if && 897 (!midx || midx != sk->sk_bound_dev_if)) 898 break; 899 900 inet->mc_index = mreq.imr_ifindex; 901 inet->mc_addr = mreq.imr_address.s_addr; 902 err = 0; 903 break; 904 } 905 906 case IP_ADD_MEMBERSHIP: 907 case IP_DROP_MEMBERSHIP: 908 { 909 struct ip_mreqn mreq; 910 911 err = -EPROTO; 912 if (inet_sk(sk)->is_icsk) 913 break; 914 915 if (optlen < sizeof(struct ip_mreq)) 916 goto e_inval; 917 err = -EFAULT; 918 if (optlen >= sizeof(struct ip_mreqn)) { 919 if (copy_from_user(&mreq, optval, sizeof(mreq))) 920 break; 921 } else { 922 memset(&mreq, 0, sizeof(mreq)); 923 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 924 break; 925 } 926 927 if (optname == IP_ADD_MEMBERSHIP) 928 err = ip_mc_join_group(sk, &mreq); 929 else 930 err = ip_mc_leave_group(sk, &mreq); 931 break; 932 } 933 case IP_MSFILTER: 934 { 935 struct ip_msfilter *msf; 936 937 if (optlen < IP_MSFILTER_SIZE(0)) 938 goto e_inval; 939 if (optlen > sysctl_optmem_max) { 940 err = -ENOBUFS; 941 break; 942 } 943 msf = memdup_user(optval, optlen); 944 if (IS_ERR(msf)) { 945 err = PTR_ERR(msf); 946 break; 947 } 948 /* numsrc >= (1G-4) overflow in 32 bits */ 949 if (msf->imsf_numsrc >= 0x3ffffffcU || 950 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 951 kfree(msf); 952 err = -ENOBUFS; 953 break; 954 } 955 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 956 kfree(msf); 957 err = -EINVAL; 958 break; 959 } 960 err = ip_mc_msfilter(sk, msf, 0); 961 kfree(msf); 962 break; 963 } 964 case IP_BLOCK_SOURCE: 965 case IP_UNBLOCK_SOURCE: 966 case IP_ADD_SOURCE_MEMBERSHIP: 967 case IP_DROP_SOURCE_MEMBERSHIP: 968 { 969 struct ip_mreq_source mreqs; 970 int omode, add; 971 972 if (optlen != sizeof(struct ip_mreq_source)) 973 goto e_inval; 974 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 975 err = -EFAULT; 976 break; 977 } 978 if (optname == IP_BLOCK_SOURCE) { 979 omode = MCAST_EXCLUDE; 980 add = 1; 981 } else if (optname == IP_UNBLOCK_SOURCE) { 982 omode = MCAST_EXCLUDE; 983 add = 0; 984 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 985 struct ip_mreqn mreq; 986 987 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 988 mreq.imr_address.s_addr = mreqs.imr_interface; 989 mreq.imr_ifindex = 0; 990 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 991 if (err && err != -EADDRINUSE) 992 break; 993 omode = MCAST_INCLUDE; 994 add = 1; 995 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 996 omode = MCAST_INCLUDE; 997 add = 0; 998 } 999 err = ip_mc_source(add, omode, sk, &mreqs, 0); 1000 break; 1001 } 1002 case MCAST_JOIN_GROUP: 1003 case MCAST_LEAVE_GROUP: 1004 { 1005 struct group_req greq; 1006 struct sockaddr_in *psin; 1007 struct ip_mreqn mreq; 1008 1009 if (optlen < sizeof(struct group_req)) 1010 goto e_inval; 1011 err = -EFAULT; 1012 if (copy_from_user(&greq, optval, sizeof(greq))) 1013 break; 1014 psin = (struct sockaddr_in *)&greq.gr_group; 1015 if (psin->sin_family != AF_INET) 1016 goto e_inval; 1017 memset(&mreq, 0, sizeof(mreq)); 1018 mreq.imr_multiaddr = psin->sin_addr; 1019 mreq.imr_ifindex = greq.gr_interface; 1020 1021 if (optname == MCAST_JOIN_GROUP) 1022 err = ip_mc_join_group(sk, &mreq); 1023 else 1024 err = ip_mc_leave_group(sk, &mreq); 1025 break; 1026 } 1027 case MCAST_JOIN_SOURCE_GROUP: 1028 case MCAST_LEAVE_SOURCE_GROUP: 1029 case MCAST_BLOCK_SOURCE: 1030 case MCAST_UNBLOCK_SOURCE: 1031 { 1032 struct group_source_req greqs; 1033 struct ip_mreq_source mreqs; 1034 struct sockaddr_in *psin; 1035 int omode, add; 1036 1037 if (optlen != sizeof(struct group_source_req)) 1038 goto e_inval; 1039 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1040 err = -EFAULT; 1041 break; 1042 } 1043 if (greqs.gsr_group.ss_family != AF_INET || 1044 greqs.gsr_source.ss_family != AF_INET) { 1045 err = -EADDRNOTAVAIL; 1046 break; 1047 } 1048 psin = (struct sockaddr_in *)&greqs.gsr_group; 1049 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1050 psin = (struct sockaddr_in *)&greqs.gsr_source; 1051 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1052 mreqs.imr_interface = 0; /* use index for mc_source */ 1053 1054 if (optname == MCAST_BLOCK_SOURCE) { 1055 omode = MCAST_EXCLUDE; 1056 add = 1; 1057 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1058 omode = MCAST_EXCLUDE; 1059 add = 0; 1060 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1061 struct ip_mreqn mreq; 1062 1063 psin = (struct sockaddr_in *)&greqs.gsr_group; 1064 mreq.imr_multiaddr = psin->sin_addr; 1065 mreq.imr_address.s_addr = 0; 1066 mreq.imr_ifindex = greqs.gsr_interface; 1067 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 1068 if (err && err != -EADDRINUSE) 1069 break; 1070 greqs.gsr_interface = mreq.imr_ifindex; 1071 omode = MCAST_INCLUDE; 1072 add = 1; 1073 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1074 omode = MCAST_INCLUDE; 1075 add = 0; 1076 } 1077 err = ip_mc_source(add, omode, sk, &mreqs, 1078 greqs.gsr_interface); 1079 break; 1080 } 1081 case MCAST_MSFILTER: 1082 { 1083 struct sockaddr_in *psin; 1084 struct ip_msfilter *msf = NULL; 1085 struct group_filter *gsf = NULL; 1086 int msize, i, ifindex; 1087 1088 if (optlen < GROUP_FILTER_SIZE(0)) 1089 goto e_inval; 1090 if (optlen > sysctl_optmem_max) { 1091 err = -ENOBUFS; 1092 break; 1093 } 1094 gsf = memdup_user(optval, optlen); 1095 if (IS_ERR(gsf)) { 1096 err = PTR_ERR(gsf); 1097 break; 1098 } 1099 1100 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1101 if (gsf->gf_numsrc >= 0x1ffffff || 1102 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1103 err = -ENOBUFS; 1104 goto mc_msf_out; 1105 } 1106 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1107 err = -EINVAL; 1108 goto mc_msf_out; 1109 } 1110 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1111 msf = kmalloc(msize, GFP_KERNEL); 1112 if (!msf) { 1113 err = -ENOBUFS; 1114 goto mc_msf_out; 1115 } 1116 ifindex = gsf->gf_interface; 1117 psin = (struct sockaddr_in *)&gsf->gf_group; 1118 if (psin->sin_family != AF_INET) { 1119 err = -EADDRNOTAVAIL; 1120 goto mc_msf_out; 1121 } 1122 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1123 msf->imsf_interface = 0; 1124 msf->imsf_fmode = gsf->gf_fmode; 1125 msf->imsf_numsrc = gsf->gf_numsrc; 1126 err = -EADDRNOTAVAIL; 1127 for (i = 0; i < gsf->gf_numsrc; ++i) { 1128 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1129 1130 if (psin->sin_family != AF_INET) 1131 goto mc_msf_out; 1132 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1133 } 1134 kfree(gsf); 1135 gsf = NULL; 1136 1137 err = ip_mc_msfilter(sk, msf, ifindex); 1138 mc_msf_out: 1139 kfree(msf); 1140 kfree(gsf); 1141 break; 1142 } 1143 case IP_MULTICAST_ALL: 1144 if (optlen < 1) 1145 goto e_inval; 1146 if (val != 0 && val != 1) 1147 goto e_inval; 1148 inet->mc_all = val; 1149 break; 1150 1151 case IP_FREEBIND: 1152 if (optlen < 1) 1153 goto e_inval; 1154 inet->freebind = !!val; 1155 break; 1156 1157 case IP_IPSEC_POLICY: 1158 case IP_XFRM_POLICY: 1159 err = -EPERM; 1160 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1161 break; 1162 err = xfrm_user_policy(sk, optname, optval, optlen); 1163 break; 1164 1165 case IP_TRANSPARENT: 1166 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1167 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1168 err = -EPERM; 1169 break; 1170 } 1171 if (optlen < 1) 1172 goto e_inval; 1173 inet->transparent = !!val; 1174 break; 1175 1176 case IP_MINTTL: 1177 if (optlen < 1) 1178 goto e_inval; 1179 if (val < 0 || val > 255) 1180 goto e_inval; 1181 inet->min_ttl = val; 1182 break; 1183 1184 default: 1185 err = -ENOPROTOOPT; 1186 break; 1187 } 1188 release_sock(sk); 1189 if (needs_rtnl) 1190 rtnl_unlock(); 1191 return err; 1192 1193 e_inval: 1194 release_sock(sk); 1195 if (needs_rtnl) 1196 rtnl_unlock(); 1197 return -EINVAL; 1198 } 1199 1200 /** 1201 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1202 * @sk: socket 1203 * @skb: buffer 1204 * 1205 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1206 * destination in skb->cb[] before dst drop. 1207 * This way, receiver doesn't make cache line misses to read rtable. 1208 */ 1209 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1210 { 1211 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1212 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1213 ipv6_sk_rxinfo(sk); 1214 1215 if (prepare && skb_rtable(skb)) { 1216 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1217 * which has interface index (iif) as the first member of the 1218 * underlying inet{6}_skb_parm struct. This code then overlays 1219 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1220 * element so the iif is picked up from the prior IPCB. If iif 1221 * is the loopback interface, then return the sending interface 1222 * (e.g., process binds socket to eth0 for Tx which is 1223 * redirected to loopback in the rtable/dst). 1224 */ 1225 struct rtable *rt = skb_rtable(skb); 1226 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1227 1228 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1229 pktinfo->ipi_ifindex = inet_iif(skb); 1230 else if (l3slave && rt && rt->rt_iif) 1231 pktinfo->ipi_ifindex = rt->rt_iif; 1232 1233 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1234 } else { 1235 pktinfo->ipi_ifindex = 0; 1236 pktinfo->ipi_spec_dst.s_addr = 0; 1237 } 1238 skb_dst_drop(skb); 1239 } 1240 1241 int ip_setsockopt(struct sock *sk, int level, 1242 int optname, char __user *optval, unsigned int optlen) 1243 { 1244 int err; 1245 1246 if (level != SOL_IP) 1247 return -ENOPROTOOPT; 1248 1249 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1250 #ifdef CONFIG_BPFILTER 1251 if (optname >= BPFILTER_IPT_SO_SET_REPLACE && 1252 optname < BPFILTER_IPT_SET_MAX) 1253 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); 1254 #endif 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_BPFILTER 1564 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1565 optname < BPFILTER_IPT_GET_MAX) 1566 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1567 #endif 1568 #ifdef CONFIG_NETFILTER 1569 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1570 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1571 !ip_mroute_opt(optname)) { 1572 int len; 1573 1574 if (get_user(len, optlen)) 1575 return -EFAULT; 1576 1577 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1578 if (err >= 0) 1579 err = put_user(len, optlen); 1580 return err; 1581 } 1582 #endif 1583 return err; 1584 } 1585 EXPORT_SYMBOL(ip_getsockopt); 1586 1587 #ifdef CONFIG_COMPAT 1588 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1589 char __user *optval, int __user *optlen) 1590 { 1591 int err; 1592 1593 if (optname == MCAST_MSFILTER) 1594 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1595 ip_getsockopt); 1596 1597 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1598 MSG_CMSG_COMPAT); 1599 1600 #ifdef CONFIG_BPFILTER 1601 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1602 optname < BPFILTER_IPT_GET_MAX) 1603 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1604 #endif 1605 #ifdef CONFIG_NETFILTER 1606 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1607 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1608 !ip_mroute_opt(optname)) { 1609 int len; 1610 1611 if (get_user(len, optlen)) 1612 return -EFAULT; 1613 1614 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1615 if (err >= 0) 1616 err = put_user(len, optlen); 1617 return err; 1618 } 1619 #endif 1620 return err; 1621 } 1622 EXPORT_SYMBOL(compat_ip_getsockopt); 1623 #endif 1624