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 <asm/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 msghdr *msg, struct sk_buff *skb) 84 { 85 unsigned char optbuf[sizeof(struct ip_options) + 40]; 86 struct ip_options *opt = (struct ip_options *)optbuf; 87 88 if (IPCB(skb)->opt.optlen == 0) 89 return; 90 91 if (ip_options_echo(opt, skb)) { 92 msg->msg_flags |= MSG_CTRUNC; 93 return; 94 } 95 ip_options_undo(opt); 96 97 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 98 } 99 100 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 101 int offset) 102 { 103 __wsum csum = skb->csum; 104 105 if (skb->ip_summed != CHECKSUM_COMPLETE) 106 return; 107 108 if (offset != 0) 109 csum = csum_sub(csum, csum_partial(skb->data, offset, 0)); 110 111 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 112 } 113 114 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 115 { 116 char *secdata; 117 u32 seclen, secid; 118 int err; 119 120 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 121 if (err) 122 return; 123 124 err = security_secid_to_secctx(secid, &secdata, &seclen); 125 if (err) 126 return; 127 128 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 129 security_release_secctx(secdata, seclen); 130 } 131 132 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 133 { 134 struct sockaddr_in sin; 135 const struct iphdr *iph = ip_hdr(skb); 136 __be16 *ports = (__be16 *)skb_transport_header(skb); 137 138 if (skb_transport_offset(skb) + 4 > skb->len) 139 return; 140 141 /* All current transport protocols have the port numbers in the 142 * first four bytes of the transport header and this function is 143 * written with this assumption in mind. 144 */ 145 146 sin.sin_family = AF_INET; 147 sin.sin_addr.s_addr = iph->daddr; 148 sin.sin_port = ports[1]; 149 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 150 151 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 152 } 153 154 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, 155 int offset) 156 { 157 struct inet_sock *inet = inet_sk(skb->sk); 158 unsigned int flags = inet->cmsg_flags; 159 160 /* Ordered by supposed usage frequency */ 161 if (flags & IP_CMSG_PKTINFO) { 162 ip_cmsg_recv_pktinfo(msg, skb); 163 164 flags &= ~IP_CMSG_PKTINFO; 165 if (!flags) 166 return; 167 } 168 169 if (flags & IP_CMSG_TTL) { 170 ip_cmsg_recv_ttl(msg, skb); 171 172 flags &= ~IP_CMSG_TTL; 173 if (!flags) 174 return; 175 } 176 177 if (flags & IP_CMSG_TOS) { 178 ip_cmsg_recv_tos(msg, skb); 179 180 flags &= ~IP_CMSG_TOS; 181 if (!flags) 182 return; 183 } 184 185 if (flags & IP_CMSG_RECVOPTS) { 186 ip_cmsg_recv_opts(msg, skb); 187 188 flags &= ~IP_CMSG_RECVOPTS; 189 if (!flags) 190 return; 191 } 192 193 if (flags & IP_CMSG_RETOPTS) { 194 ip_cmsg_recv_retopts(msg, skb); 195 196 flags &= ~IP_CMSG_RETOPTS; 197 if (!flags) 198 return; 199 } 200 201 if (flags & IP_CMSG_PASSSEC) { 202 ip_cmsg_recv_security(msg, skb); 203 204 flags &= ~IP_CMSG_PASSSEC; 205 if (!flags) 206 return; 207 } 208 209 if (flags & IP_CMSG_ORIGDSTADDR) { 210 ip_cmsg_recv_dstaddr(msg, skb); 211 212 flags &= ~IP_CMSG_ORIGDSTADDR; 213 if (!flags) 214 return; 215 } 216 217 if (flags & IP_CMSG_CHECKSUM) 218 ip_cmsg_recv_checksum(msg, skb, offset); 219 } 220 EXPORT_SYMBOL(ip_cmsg_recv_offset); 221 222 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, 223 bool allow_ipv6) 224 { 225 int err, val; 226 struct cmsghdr *cmsg; 227 228 for_each_cmsghdr(cmsg, msg) { 229 if (!CMSG_OK(msg, cmsg)) 230 return -EINVAL; 231 #if IS_ENABLED(CONFIG_IPV6) 232 if (allow_ipv6 && 233 cmsg->cmsg_level == SOL_IPV6 && 234 cmsg->cmsg_type == IPV6_PKTINFO) { 235 struct in6_pktinfo *src_info; 236 237 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 238 return -EINVAL; 239 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 240 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 241 return -EINVAL; 242 ipc->oif = src_info->ipi6_ifindex; 243 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 244 continue; 245 } 246 #endif 247 if (cmsg->cmsg_level != SOL_IP) 248 continue; 249 switch (cmsg->cmsg_type) { 250 case IP_RETOPTS: 251 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 252 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 253 err < 40 ? err : 40); 254 if (err) 255 return err; 256 break; 257 case IP_PKTINFO: 258 { 259 struct in_pktinfo *info; 260 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 261 return -EINVAL; 262 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 263 ipc->oif = info->ipi_ifindex; 264 ipc->addr = info->ipi_spec_dst.s_addr; 265 break; 266 } 267 case IP_TTL: 268 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 269 return -EINVAL; 270 val = *(int *)CMSG_DATA(cmsg); 271 if (val < 1 || val > 255) 272 return -EINVAL; 273 ipc->ttl = val; 274 break; 275 case IP_TOS: 276 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 277 return -EINVAL; 278 val = *(int *)CMSG_DATA(cmsg); 279 if (val < 0 || val > 255) 280 return -EINVAL; 281 ipc->tos = val; 282 ipc->priority = rt_tos2priority(ipc->tos); 283 break; 284 285 default: 286 return -EINVAL; 287 } 288 } 289 return 0; 290 } 291 292 293 /* Special input handler for packets caught by router alert option. 294 They are selected only by protocol field, and then processed likely 295 local ones; but only if someone wants them! Otherwise, router 296 not running rsvpd will kill RSVP. 297 298 It is user level problem, what it will make with them. 299 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 300 but receiver should be enough clever f.e. to forward mtrace requests, 301 sent to multicast group to reach destination designated router. 302 */ 303 struct ip_ra_chain __rcu *ip_ra_chain; 304 static DEFINE_SPINLOCK(ip_ra_lock); 305 306 307 static void ip_ra_destroy_rcu(struct rcu_head *head) 308 { 309 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 310 311 sock_put(ra->saved_sk); 312 kfree(ra); 313 } 314 315 int ip_ra_control(struct sock *sk, unsigned char on, 316 void (*destructor)(struct sock *)) 317 { 318 struct ip_ra_chain *ra, *new_ra; 319 struct ip_ra_chain __rcu **rap; 320 321 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 322 return -EINVAL; 323 324 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 325 326 spin_lock_bh(&ip_ra_lock); 327 for (rap = &ip_ra_chain; 328 (ra = rcu_dereference_protected(*rap, 329 lockdep_is_held(&ip_ra_lock))) != NULL; 330 rap = &ra->next) { 331 if (ra->sk == sk) { 332 if (on) { 333 spin_unlock_bh(&ip_ra_lock); 334 kfree(new_ra); 335 return -EADDRINUSE; 336 } 337 /* dont let ip_call_ra_chain() use sk again */ 338 ra->sk = NULL; 339 RCU_INIT_POINTER(*rap, ra->next); 340 spin_unlock_bh(&ip_ra_lock); 341 342 if (ra->destructor) 343 ra->destructor(sk); 344 /* 345 * Delay sock_put(sk) and kfree(ra) after one rcu grace 346 * period. This guarantee ip_call_ra_chain() dont need 347 * to mess with socket refcounts. 348 */ 349 ra->saved_sk = sk; 350 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 351 return 0; 352 } 353 } 354 if (!new_ra) { 355 spin_unlock_bh(&ip_ra_lock); 356 return -ENOBUFS; 357 } 358 new_ra->sk = sk; 359 new_ra->destructor = destructor; 360 361 RCU_INIT_POINTER(new_ra->next, ra); 362 rcu_assign_pointer(*rap, new_ra); 363 sock_hold(sk); 364 spin_unlock_bh(&ip_ra_lock); 365 366 return 0; 367 } 368 369 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 370 __be16 port, u32 info, u8 *payload) 371 { 372 struct sock_exterr_skb *serr; 373 374 skb = skb_clone(skb, GFP_ATOMIC); 375 if (!skb) 376 return; 377 378 serr = SKB_EXT_ERR(skb); 379 serr->ee.ee_errno = err; 380 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 381 serr->ee.ee_type = icmp_hdr(skb)->type; 382 serr->ee.ee_code = icmp_hdr(skb)->code; 383 serr->ee.ee_pad = 0; 384 serr->ee.ee_info = info; 385 serr->ee.ee_data = 0; 386 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 387 skb_network_header(skb); 388 serr->port = port; 389 390 if (skb_pull(skb, payload - skb->data)) { 391 skb_reset_transport_header(skb); 392 if (sock_queue_err_skb(sk, skb) == 0) 393 return; 394 } 395 kfree_skb(skb); 396 } 397 398 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 399 { 400 struct inet_sock *inet = inet_sk(sk); 401 struct sock_exterr_skb *serr; 402 struct iphdr *iph; 403 struct sk_buff *skb; 404 405 if (!inet->recverr) 406 return; 407 408 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 409 if (!skb) 410 return; 411 412 skb_put(skb, sizeof(struct iphdr)); 413 skb_reset_network_header(skb); 414 iph = ip_hdr(skb); 415 iph->daddr = daddr; 416 417 serr = SKB_EXT_ERR(skb); 418 serr->ee.ee_errno = err; 419 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 420 serr->ee.ee_type = 0; 421 serr->ee.ee_code = 0; 422 serr->ee.ee_pad = 0; 423 serr->ee.ee_info = info; 424 serr->ee.ee_data = 0; 425 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 426 serr->port = port; 427 428 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 429 skb_reset_transport_header(skb); 430 431 if (sock_queue_err_skb(sk, skb)) 432 kfree_skb(skb); 433 } 434 435 /* For some errors we have valid addr_offset even with zero payload and 436 * zero port. Also, addr_offset should be supported if port is set. 437 */ 438 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 439 { 440 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 441 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 442 } 443 444 /* IPv4 supports cmsg on all imcp errors and some timestamps 445 * 446 * Timestamp code paths do not initialize the fields expected by cmsg: 447 * the PKTINFO fields in skb->cb[]. Fill those in here. 448 */ 449 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 450 struct sk_buff *skb, 451 int ee_origin) 452 { 453 struct in_pktinfo *info; 454 455 if (ee_origin == SO_EE_ORIGIN_ICMP) 456 return true; 457 458 if (ee_origin == SO_EE_ORIGIN_LOCAL) 459 return false; 460 461 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 462 * timestamp with egress dev. Not possible for packets without dev 463 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 464 */ 465 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 466 (!skb->dev)) 467 return false; 468 469 info = PKTINFO_SKB_CB(skb); 470 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 471 info->ipi_ifindex = skb->dev->ifindex; 472 return true; 473 } 474 475 /* 476 * Handle MSG_ERRQUEUE 477 */ 478 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 479 { 480 struct sock_exterr_skb *serr; 481 struct sk_buff *skb; 482 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 483 struct { 484 struct sock_extended_err ee; 485 struct sockaddr_in offender; 486 } errhdr; 487 int err; 488 int copied; 489 490 WARN_ON_ONCE(sk->sk_family == AF_INET6); 491 492 err = -EAGAIN; 493 skb = sock_dequeue_err_skb(sk); 494 if (!skb) 495 goto out; 496 497 copied = skb->len; 498 if (copied > len) { 499 msg->msg_flags |= MSG_TRUNC; 500 copied = len; 501 } 502 err = skb_copy_datagram_msg(skb, 0, msg, copied); 503 if (err) 504 goto out_free_skb; 505 506 sock_recv_timestamp(msg, sk, skb); 507 508 serr = SKB_EXT_ERR(skb); 509 510 if (sin && ipv4_datagram_support_addr(serr)) { 511 sin->sin_family = AF_INET; 512 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 513 serr->addr_offset); 514 sin->sin_port = serr->port; 515 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 516 *addr_len = sizeof(*sin); 517 } 518 519 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 520 sin = &errhdr.offender; 521 memset(sin, 0, sizeof(*sin)); 522 523 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 524 sin->sin_family = AF_INET; 525 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 526 if (inet_sk(sk)->cmsg_flags) 527 ip_cmsg_recv(msg, skb); 528 } 529 530 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 531 532 /* Now we could try to dump offended packet options */ 533 534 msg->msg_flags |= MSG_ERRQUEUE; 535 err = copied; 536 537 out_free_skb: 538 kfree_skb(skb); 539 out: 540 return err; 541 } 542 543 544 /* 545 * Socket option code for IP. This is the end of the line after any 546 * TCP,UDP etc options on an IP socket. 547 */ 548 static bool setsockopt_needs_rtnl(int optname) 549 { 550 switch (optname) { 551 case IP_ADD_MEMBERSHIP: 552 case IP_ADD_SOURCE_MEMBERSHIP: 553 case IP_BLOCK_SOURCE: 554 case IP_DROP_MEMBERSHIP: 555 case IP_DROP_SOURCE_MEMBERSHIP: 556 case IP_MSFILTER: 557 case IP_UNBLOCK_SOURCE: 558 case MCAST_BLOCK_SOURCE: 559 case MCAST_MSFILTER: 560 case MCAST_JOIN_GROUP: 561 case MCAST_JOIN_SOURCE_GROUP: 562 case MCAST_LEAVE_GROUP: 563 case MCAST_LEAVE_SOURCE_GROUP: 564 case MCAST_UNBLOCK_SOURCE: 565 return true; 566 } 567 return false; 568 } 569 570 static int do_ip_setsockopt(struct sock *sk, int level, 571 int optname, char __user *optval, unsigned int optlen) 572 { 573 struct inet_sock *inet = inet_sk(sk); 574 int val = 0, err; 575 bool needs_rtnl = setsockopt_needs_rtnl(optname); 576 577 switch (optname) { 578 case IP_PKTINFO: 579 case IP_RECVTTL: 580 case IP_RECVOPTS: 581 case IP_RECVTOS: 582 case IP_RETOPTS: 583 case IP_TOS: 584 case IP_TTL: 585 case IP_HDRINCL: 586 case IP_MTU_DISCOVER: 587 case IP_RECVERR: 588 case IP_ROUTER_ALERT: 589 case IP_FREEBIND: 590 case IP_PASSSEC: 591 case IP_TRANSPARENT: 592 case IP_MINTTL: 593 case IP_NODEFRAG: 594 case IP_BIND_ADDRESS_NO_PORT: 595 case IP_UNICAST_IF: 596 case IP_MULTICAST_TTL: 597 case IP_MULTICAST_ALL: 598 case IP_MULTICAST_LOOP: 599 case IP_RECVORIGDSTADDR: 600 case IP_CHECKSUM: 601 if (optlen >= sizeof(int)) { 602 if (get_user(val, (int __user *) optval)) 603 return -EFAULT; 604 } else if (optlen >= sizeof(char)) { 605 unsigned char ucval; 606 607 if (get_user(ucval, (unsigned char __user *) optval)) 608 return -EFAULT; 609 val = (int) ucval; 610 } 611 } 612 613 /* If optlen==0, it is equivalent to val == 0 */ 614 615 if (ip_mroute_opt(optname)) 616 return ip_mroute_setsockopt(sk, optname, optval, optlen); 617 618 err = 0; 619 if (needs_rtnl) 620 rtnl_lock(); 621 lock_sock(sk); 622 623 switch (optname) { 624 case IP_OPTIONS: 625 { 626 struct ip_options_rcu *old, *opt = NULL; 627 628 if (optlen > 40) 629 goto e_inval; 630 err = ip_options_get_from_user(sock_net(sk), &opt, 631 optval, optlen); 632 if (err) 633 break; 634 old = rcu_dereference_protected(inet->inet_opt, 635 sock_owned_by_user(sk)); 636 if (inet->is_icsk) { 637 struct inet_connection_sock *icsk = inet_csk(sk); 638 #if IS_ENABLED(CONFIG_IPV6) 639 if (sk->sk_family == PF_INET || 640 (!((1 << sk->sk_state) & 641 (TCPF_LISTEN | TCPF_CLOSE)) && 642 inet->inet_daddr != LOOPBACK4_IPV6)) { 643 #endif 644 if (old) 645 icsk->icsk_ext_hdr_len -= old->opt.optlen; 646 if (opt) 647 icsk->icsk_ext_hdr_len += opt->opt.optlen; 648 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 649 #if IS_ENABLED(CONFIG_IPV6) 650 } 651 #endif 652 } 653 rcu_assign_pointer(inet->inet_opt, opt); 654 if (old) 655 kfree_rcu(old, rcu); 656 break; 657 } 658 case IP_PKTINFO: 659 if (val) 660 inet->cmsg_flags |= IP_CMSG_PKTINFO; 661 else 662 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 663 break; 664 case IP_RECVTTL: 665 if (val) 666 inet->cmsg_flags |= IP_CMSG_TTL; 667 else 668 inet->cmsg_flags &= ~IP_CMSG_TTL; 669 break; 670 case IP_RECVTOS: 671 if (val) 672 inet->cmsg_flags |= IP_CMSG_TOS; 673 else 674 inet->cmsg_flags &= ~IP_CMSG_TOS; 675 break; 676 case IP_RECVOPTS: 677 if (val) 678 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 679 else 680 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 681 break; 682 case IP_RETOPTS: 683 if (val) 684 inet->cmsg_flags |= IP_CMSG_RETOPTS; 685 else 686 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 687 break; 688 case IP_PASSSEC: 689 if (val) 690 inet->cmsg_flags |= IP_CMSG_PASSSEC; 691 else 692 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 693 break; 694 case IP_RECVORIGDSTADDR: 695 if (val) 696 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 697 else 698 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 699 break; 700 case IP_CHECKSUM: 701 if (val) { 702 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 703 inet_inc_convert_csum(sk); 704 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 705 } 706 } else { 707 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 708 inet_dec_convert_csum(sk); 709 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 710 } 711 } 712 break; 713 case IP_TOS: /* This sets both TOS and Precedence */ 714 if (sk->sk_type == SOCK_STREAM) { 715 val &= ~INET_ECN_MASK; 716 val |= inet->tos & INET_ECN_MASK; 717 } 718 if (inet->tos != val) { 719 inet->tos = val; 720 sk->sk_priority = rt_tos2priority(val); 721 sk_dst_reset(sk); 722 } 723 break; 724 case IP_TTL: 725 if (optlen < 1) 726 goto e_inval; 727 if (val != -1 && (val < 1 || val > 255)) 728 goto e_inval; 729 inet->uc_ttl = val; 730 break; 731 case IP_HDRINCL: 732 if (sk->sk_type != SOCK_RAW) { 733 err = -ENOPROTOOPT; 734 break; 735 } 736 inet->hdrincl = val ? 1 : 0; 737 break; 738 case IP_NODEFRAG: 739 if (sk->sk_type != SOCK_RAW) { 740 err = -ENOPROTOOPT; 741 break; 742 } 743 inet->nodefrag = val ? 1 : 0; 744 break; 745 case IP_BIND_ADDRESS_NO_PORT: 746 inet->bind_address_no_port = val ? 1 : 0; 747 break; 748 case IP_MTU_DISCOVER: 749 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 750 goto e_inval; 751 inet->pmtudisc = val; 752 break; 753 case IP_RECVERR: 754 inet->recverr = !!val; 755 if (!val) 756 skb_queue_purge(&sk->sk_error_queue); 757 break; 758 case IP_MULTICAST_TTL: 759 if (sk->sk_type == SOCK_STREAM) 760 goto e_inval; 761 if (optlen < 1) 762 goto e_inval; 763 if (val == -1) 764 val = 1; 765 if (val < 0 || val > 255) 766 goto e_inval; 767 inet->mc_ttl = val; 768 break; 769 case IP_MULTICAST_LOOP: 770 if (optlen < 1) 771 goto e_inval; 772 inet->mc_loop = !!val; 773 break; 774 case IP_UNICAST_IF: 775 { 776 struct net_device *dev = NULL; 777 int ifindex; 778 779 if (optlen != sizeof(int)) 780 goto e_inval; 781 782 ifindex = (__force int)ntohl((__force __be32)val); 783 if (ifindex == 0) { 784 inet->uc_index = 0; 785 err = 0; 786 break; 787 } 788 789 dev = dev_get_by_index(sock_net(sk), ifindex); 790 err = -EADDRNOTAVAIL; 791 if (!dev) 792 break; 793 dev_put(dev); 794 795 err = -EINVAL; 796 if (sk->sk_bound_dev_if) 797 break; 798 799 inet->uc_index = ifindex; 800 err = 0; 801 break; 802 } 803 case IP_MULTICAST_IF: 804 { 805 struct ip_mreqn mreq; 806 struct net_device *dev = NULL; 807 808 if (sk->sk_type == SOCK_STREAM) 809 goto e_inval; 810 /* 811 * Check the arguments are allowable 812 */ 813 814 if (optlen < sizeof(struct in_addr)) 815 goto e_inval; 816 817 err = -EFAULT; 818 if (optlen >= sizeof(struct ip_mreqn)) { 819 if (copy_from_user(&mreq, optval, sizeof(mreq))) 820 break; 821 } else { 822 memset(&mreq, 0, sizeof(mreq)); 823 if (optlen >= sizeof(struct ip_mreq)) { 824 if (copy_from_user(&mreq, optval, 825 sizeof(struct ip_mreq))) 826 break; 827 } else if (optlen >= sizeof(struct in_addr)) { 828 if (copy_from_user(&mreq.imr_address, optval, 829 sizeof(struct in_addr))) 830 break; 831 } 832 } 833 834 if (!mreq.imr_ifindex) { 835 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 836 inet->mc_index = 0; 837 inet->mc_addr = 0; 838 err = 0; 839 break; 840 } 841 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 842 if (dev) 843 mreq.imr_ifindex = dev->ifindex; 844 } else 845 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 846 847 848 err = -EADDRNOTAVAIL; 849 if (!dev) 850 break; 851 dev_put(dev); 852 853 err = -EINVAL; 854 if (sk->sk_bound_dev_if && 855 mreq.imr_ifindex != sk->sk_bound_dev_if) 856 break; 857 858 inet->mc_index = mreq.imr_ifindex; 859 inet->mc_addr = mreq.imr_address.s_addr; 860 err = 0; 861 break; 862 } 863 864 case IP_ADD_MEMBERSHIP: 865 case IP_DROP_MEMBERSHIP: 866 { 867 struct ip_mreqn mreq; 868 869 err = -EPROTO; 870 if (inet_sk(sk)->is_icsk) 871 break; 872 873 if (optlen < sizeof(struct ip_mreq)) 874 goto e_inval; 875 err = -EFAULT; 876 if (optlen >= sizeof(struct ip_mreqn)) { 877 if (copy_from_user(&mreq, optval, sizeof(mreq))) 878 break; 879 } else { 880 memset(&mreq, 0, sizeof(mreq)); 881 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 882 break; 883 } 884 885 if (optname == IP_ADD_MEMBERSHIP) 886 err = ip_mc_join_group(sk, &mreq); 887 else 888 err = ip_mc_leave_group(sk, &mreq); 889 break; 890 } 891 case IP_MSFILTER: 892 { 893 struct ip_msfilter *msf; 894 895 if (optlen < IP_MSFILTER_SIZE(0)) 896 goto e_inval; 897 if (optlen > sysctl_optmem_max) { 898 err = -ENOBUFS; 899 break; 900 } 901 msf = kmalloc(optlen, GFP_KERNEL); 902 if (!msf) { 903 err = -ENOBUFS; 904 break; 905 } 906 err = -EFAULT; 907 if (copy_from_user(msf, optval, optlen)) { 908 kfree(msf); 909 break; 910 } 911 /* numsrc >= (1G-4) overflow in 32 bits */ 912 if (msf->imsf_numsrc >= 0x3ffffffcU || 913 msf->imsf_numsrc > sysctl_igmp_max_msf) { 914 kfree(msf); 915 err = -ENOBUFS; 916 break; 917 } 918 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 919 kfree(msf); 920 err = -EINVAL; 921 break; 922 } 923 err = ip_mc_msfilter(sk, msf, 0); 924 kfree(msf); 925 break; 926 } 927 case IP_BLOCK_SOURCE: 928 case IP_UNBLOCK_SOURCE: 929 case IP_ADD_SOURCE_MEMBERSHIP: 930 case IP_DROP_SOURCE_MEMBERSHIP: 931 { 932 struct ip_mreq_source mreqs; 933 int omode, add; 934 935 if (optlen != sizeof(struct ip_mreq_source)) 936 goto e_inval; 937 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 938 err = -EFAULT; 939 break; 940 } 941 if (optname == IP_BLOCK_SOURCE) { 942 omode = MCAST_EXCLUDE; 943 add = 1; 944 } else if (optname == IP_UNBLOCK_SOURCE) { 945 omode = MCAST_EXCLUDE; 946 add = 0; 947 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 948 struct ip_mreqn mreq; 949 950 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 951 mreq.imr_address.s_addr = mreqs.imr_interface; 952 mreq.imr_ifindex = 0; 953 err = ip_mc_join_group(sk, &mreq); 954 if (err && err != -EADDRINUSE) 955 break; 956 omode = MCAST_INCLUDE; 957 add = 1; 958 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 959 omode = MCAST_INCLUDE; 960 add = 0; 961 } 962 err = ip_mc_source(add, omode, sk, &mreqs, 0); 963 break; 964 } 965 case MCAST_JOIN_GROUP: 966 case MCAST_LEAVE_GROUP: 967 { 968 struct group_req greq; 969 struct sockaddr_in *psin; 970 struct ip_mreqn mreq; 971 972 if (optlen < sizeof(struct group_req)) 973 goto e_inval; 974 err = -EFAULT; 975 if (copy_from_user(&greq, optval, sizeof(greq))) 976 break; 977 psin = (struct sockaddr_in *)&greq.gr_group; 978 if (psin->sin_family != AF_INET) 979 goto e_inval; 980 memset(&mreq, 0, sizeof(mreq)); 981 mreq.imr_multiaddr = psin->sin_addr; 982 mreq.imr_ifindex = greq.gr_interface; 983 984 if (optname == MCAST_JOIN_GROUP) 985 err = ip_mc_join_group(sk, &mreq); 986 else 987 err = ip_mc_leave_group(sk, &mreq); 988 break; 989 } 990 case MCAST_JOIN_SOURCE_GROUP: 991 case MCAST_LEAVE_SOURCE_GROUP: 992 case MCAST_BLOCK_SOURCE: 993 case MCAST_UNBLOCK_SOURCE: 994 { 995 struct group_source_req greqs; 996 struct ip_mreq_source mreqs; 997 struct sockaddr_in *psin; 998 int omode, add; 999 1000 if (optlen != sizeof(struct group_source_req)) 1001 goto e_inval; 1002 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1003 err = -EFAULT; 1004 break; 1005 } 1006 if (greqs.gsr_group.ss_family != AF_INET || 1007 greqs.gsr_source.ss_family != AF_INET) { 1008 err = -EADDRNOTAVAIL; 1009 break; 1010 } 1011 psin = (struct sockaddr_in *)&greqs.gsr_group; 1012 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1013 psin = (struct sockaddr_in *)&greqs.gsr_source; 1014 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1015 mreqs.imr_interface = 0; /* use index for mc_source */ 1016 1017 if (optname == MCAST_BLOCK_SOURCE) { 1018 omode = MCAST_EXCLUDE; 1019 add = 1; 1020 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1021 omode = MCAST_EXCLUDE; 1022 add = 0; 1023 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1024 struct ip_mreqn mreq; 1025 1026 psin = (struct sockaddr_in *)&greqs.gsr_group; 1027 mreq.imr_multiaddr = psin->sin_addr; 1028 mreq.imr_address.s_addr = 0; 1029 mreq.imr_ifindex = greqs.gsr_interface; 1030 err = ip_mc_join_group(sk, &mreq); 1031 if (err && err != -EADDRINUSE) 1032 break; 1033 greqs.gsr_interface = mreq.imr_ifindex; 1034 omode = MCAST_INCLUDE; 1035 add = 1; 1036 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1037 omode = MCAST_INCLUDE; 1038 add = 0; 1039 } 1040 err = ip_mc_source(add, omode, sk, &mreqs, 1041 greqs.gsr_interface); 1042 break; 1043 } 1044 case MCAST_MSFILTER: 1045 { 1046 struct sockaddr_in *psin; 1047 struct ip_msfilter *msf = NULL; 1048 struct group_filter *gsf = NULL; 1049 int msize, i, ifindex; 1050 1051 if (optlen < GROUP_FILTER_SIZE(0)) 1052 goto e_inval; 1053 if (optlen > sysctl_optmem_max) { 1054 err = -ENOBUFS; 1055 break; 1056 } 1057 gsf = kmalloc(optlen, GFP_KERNEL); 1058 if (!gsf) { 1059 err = -ENOBUFS; 1060 break; 1061 } 1062 err = -EFAULT; 1063 if (copy_from_user(gsf, optval, optlen)) 1064 goto mc_msf_out; 1065 1066 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1067 if (gsf->gf_numsrc >= 0x1ffffff || 1068 gsf->gf_numsrc > sysctl_igmp_max_msf) { 1069 err = -ENOBUFS; 1070 goto mc_msf_out; 1071 } 1072 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1073 err = -EINVAL; 1074 goto mc_msf_out; 1075 } 1076 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1077 msf = kmalloc(msize, GFP_KERNEL); 1078 if (!msf) { 1079 err = -ENOBUFS; 1080 goto mc_msf_out; 1081 } 1082 ifindex = gsf->gf_interface; 1083 psin = (struct sockaddr_in *)&gsf->gf_group; 1084 if (psin->sin_family != AF_INET) { 1085 err = -EADDRNOTAVAIL; 1086 goto mc_msf_out; 1087 } 1088 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1089 msf->imsf_interface = 0; 1090 msf->imsf_fmode = gsf->gf_fmode; 1091 msf->imsf_numsrc = gsf->gf_numsrc; 1092 err = -EADDRNOTAVAIL; 1093 for (i = 0; i < gsf->gf_numsrc; ++i) { 1094 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1095 1096 if (psin->sin_family != AF_INET) 1097 goto mc_msf_out; 1098 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1099 } 1100 kfree(gsf); 1101 gsf = NULL; 1102 1103 err = ip_mc_msfilter(sk, msf, ifindex); 1104 mc_msf_out: 1105 kfree(msf); 1106 kfree(gsf); 1107 break; 1108 } 1109 case IP_MULTICAST_ALL: 1110 if (optlen < 1) 1111 goto e_inval; 1112 if (val != 0 && val != 1) 1113 goto e_inval; 1114 inet->mc_all = val; 1115 break; 1116 case IP_ROUTER_ALERT: 1117 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1118 break; 1119 1120 case IP_FREEBIND: 1121 if (optlen < 1) 1122 goto e_inval; 1123 inet->freebind = !!val; 1124 break; 1125 1126 case IP_IPSEC_POLICY: 1127 case IP_XFRM_POLICY: 1128 err = -EPERM; 1129 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1130 break; 1131 err = xfrm_user_policy(sk, optname, optval, optlen); 1132 break; 1133 1134 case IP_TRANSPARENT: 1135 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1136 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1137 err = -EPERM; 1138 break; 1139 } 1140 if (optlen < 1) 1141 goto e_inval; 1142 inet->transparent = !!val; 1143 break; 1144 1145 case IP_MINTTL: 1146 if (optlen < 1) 1147 goto e_inval; 1148 if (val < 0 || val > 255) 1149 goto e_inval; 1150 inet->min_ttl = val; 1151 break; 1152 1153 default: 1154 err = -ENOPROTOOPT; 1155 break; 1156 } 1157 release_sock(sk); 1158 if (needs_rtnl) 1159 rtnl_unlock(); 1160 return err; 1161 1162 e_inval: 1163 release_sock(sk); 1164 if (needs_rtnl) 1165 rtnl_unlock(); 1166 return -EINVAL; 1167 } 1168 1169 /** 1170 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1171 * @sk: socket 1172 * @skb: buffer 1173 * 1174 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1175 * destination in skb->cb[] before dst drop. 1176 * This way, receiver doesn't make cache line misses to read rtable. 1177 */ 1178 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1179 { 1180 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1181 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1182 ipv6_sk_rxinfo(sk); 1183 1184 if (prepare && skb_rtable(skb)) { 1185 pktinfo->ipi_ifindex = inet_iif(skb); 1186 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1187 } else { 1188 pktinfo->ipi_ifindex = 0; 1189 pktinfo->ipi_spec_dst.s_addr = 0; 1190 } 1191 skb_dst_drop(skb); 1192 } 1193 1194 int ip_setsockopt(struct sock *sk, int level, 1195 int optname, char __user *optval, unsigned int optlen) 1196 { 1197 int err; 1198 1199 if (level != SOL_IP) 1200 return -ENOPROTOOPT; 1201 1202 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1203 #ifdef CONFIG_NETFILTER 1204 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1205 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1206 optname != IP_IPSEC_POLICY && 1207 optname != IP_XFRM_POLICY && 1208 !ip_mroute_opt(optname)) { 1209 lock_sock(sk); 1210 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1211 release_sock(sk); 1212 } 1213 #endif 1214 return err; 1215 } 1216 EXPORT_SYMBOL(ip_setsockopt); 1217 1218 #ifdef CONFIG_COMPAT 1219 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1220 char __user *optval, unsigned int optlen) 1221 { 1222 int err; 1223 1224 if (level != SOL_IP) 1225 return -ENOPROTOOPT; 1226 1227 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1228 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1229 ip_setsockopt); 1230 1231 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1232 #ifdef CONFIG_NETFILTER 1233 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1234 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1235 optname != IP_IPSEC_POLICY && 1236 optname != IP_XFRM_POLICY && 1237 !ip_mroute_opt(optname)) { 1238 lock_sock(sk); 1239 err = compat_nf_setsockopt(sk, PF_INET, optname, 1240 optval, optlen); 1241 release_sock(sk); 1242 } 1243 #endif 1244 return err; 1245 } 1246 EXPORT_SYMBOL(compat_ip_setsockopt); 1247 #endif 1248 1249 /* 1250 * Get the options. Note for future reference. The GET of IP options gets 1251 * the _received_ ones. The set sets the _sent_ ones. 1252 */ 1253 1254 static bool getsockopt_needs_rtnl(int optname) 1255 { 1256 switch (optname) { 1257 case IP_MSFILTER: 1258 case MCAST_MSFILTER: 1259 return true; 1260 } 1261 return false; 1262 } 1263 1264 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1265 char __user *optval, int __user *optlen, unsigned int flags) 1266 { 1267 struct inet_sock *inet = inet_sk(sk); 1268 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1269 int val, err = 0; 1270 int len; 1271 1272 if (level != SOL_IP) 1273 return -EOPNOTSUPP; 1274 1275 if (ip_mroute_opt(optname)) 1276 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1277 1278 if (get_user(len, optlen)) 1279 return -EFAULT; 1280 if (len < 0) 1281 return -EINVAL; 1282 1283 if (needs_rtnl) 1284 rtnl_lock(); 1285 lock_sock(sk); 1286 1287 switch (optname) { 1288 case IP_OPTIONS: 1289 { 1290 unsigned char optbuf[sizeof(struct ip_options)+40]; 1291 struct ip_options *opt = (struct ip_options *)optbuf; 1292 struct ip_options_rcu *inet_opt; 1293 1294 inet_opt = rcu_dereference_protected(inet->inet_opt, 1295 sock_owned_by_user(sk)); 1296 opt->optlen = 0; 1297 if (inet_opt) 1298 memcpy(optbuf, &inet_opt->opt, 1299 sizeof(struct ip_options) + 1300 inet_opt->opt.optlen); 1301 release_sock(sk); 1302 1303 if (opt->optlen == 0) 1304 return put_user(0, optlen); 1305 1306 ip_options_undo(opt); 1307 1308 len = min_t(unsigned int, len, opt->optlen); 1309 if (put_user(len, optlen)) 1310 return -EFAULT; 1311 if (copy_to_user(optval, opt->__data, len)) 1312 return -EFAULT; 1313 return 0; 1314 } 1315 case IP_PKTINFO: 1316 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1317 break; 1318 case IP_RECVTTL: 1319 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1320 break; 1321 case IP_RECVTOS: 1322 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1323 break; 1324 case IP_RECVOPTS: 1325 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1326 break; 1327 case IP_RETOPTS: 1328 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1329 break; 1330 case IP_PASSSEC: 1331 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1332 break; 1333 case IP_RECVORIGDSTADDR: 1334 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1335 break; 1336 case IP_CHECKSUM: 1337 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1338 break; 1339 case IP_TOS: 1340 val = inet->tos; 1341 break; 1342 case IP_TTL: 1343 val = (inet->uc_ttl == -1 ? 1344 sysctl_ip_default_ttl : 1345 inet->uc_ttl); 1346 break; 1347 case IP_HDRINCL: 1348 val = inet->hdrincl; 1349 break; 1350 case IP_NODEFRAG: 1351 val = inet->nodefrag; 1352 break; 1353 case IP_BIND_ADDRESS_NO_PORT: 1354 val = inet->bind_address_no_port; 1355 break; 1356 case IP_MTU_DISCOVER: 1357 val = inet->pmtudisc; 1358 break; 1359 case IP_MTU: 1360 { 1361 struct dst_entry *dst; 1362 val = 0; 1363 dst = sk_dst_get(sk); 1364 if (dst) { 1365 val = dst_mtu(dst); 1366 dst_release(dst); 1367 } 1368 if (!val) { 1369 release_sock(sk); 1370 return -ENOTCONN; 1371 } 1372 break; 1373 } 1374 case IP_RECVERR: 1375 val = inet->recverr; 1376 break; 1377 case IP_MULTICAST_TTL: 1378 val = inet->mc_ttl; 1379 break; 1380 case IP_MULTICAST_LOOP: 1381 val = inet->mc_loop; 1382 break; 1383 case IP_UNICAST_IF: 1384 val = (__force int)htonl((__u32) inet->uc_index); 1385 break; 1386 case IP_MULTICAST_IF: 1387 { 1388 struct in_addr addr; 1389 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1390 addr.s_addr = inet->mc_addr; 1391 release_sock(sk); 1392 1393 if (put_user(len, optlen)) 1394 return -EFAULT; 1395 if (copy_to_user(optval, &addr, len)) 1396 return -EFAULT; 1397 return 0; 1398 } 1399 case IP_MSFILTER: 1400 { 1401 struct ip_msfilter msf; 1402 1403 if (len < IP_MSFILTER_SIZE(0)) { 1404 err = -EINVAL; 1405 goto out; 1406 } 1407 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1408 err = -EFAULT; 1409 goto out; 1410 } 1411 err = ip_mc_msfget(sk, &msf, 1412 (struct ip_msfilter __user *)optval, optlen); 1413 goto out; 1414 } 1415 case MCAST_MSFILTER: 1416 { 1417 struct group_filter gsf; 1418 1419 if (len < GROUP_FILTER_SIZE(0)) { 1420 err = -EINVAL; 1421 goto out; 1422 } 1423 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1424 err = -EFAULT; 1425 goto out; 1426 } 1427 err = ip_mc_gsfget(sk, &gsf, 1428 (struct group_filter __user *)optval, 1429 optlen); 1430 goto out; 1431 } 1432 case IP_MULTICAST_ALL: 1433 val = inet->mc_all; 1434 break; 1435 case IP_PKTOPTIONS: 1436 { 1437 struct msghdr msg; 1438 1439 release_sock(sk); 1440 1441 if (sk->sk_type != SOCK_STREAM) 1442 return -ENOPROTOOPT; 1443 1444 msg.msg_control = (__force void *) optval; 1445 msg.msg_controllen = len; 1446 msg.msg_flags = flags; 1447 1448 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1449 struct in_pktinfo info; 1450 1451 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1452 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1453 info.ipi_ifindex = inet->mc_index; 1454 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1455 } 1456 if (inet->cmsg_flags & IP_CMSG_TTL) { 1457 int hlim = inet->mc_ttl; 1458 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1459 } 1460 if (inet->cmsg_flags & IP_CMSG_TOS) { 1461 int tos = inet->rcv_tos; 1462 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1463 } 1464 len -= msg.msg_controllen; 1465 return put_user(len, optlen); 1466 } 1467 case IP_FREEBIND: 1468 val = inet->freebind; 1469 break; 1470 case IP_TRANSPARENT: 1471 val = inet->transparent; 1472 break; 1473 case IP_MINTTL: 1474 val = inet->min_ttl; 1475 break; 1476 default: 1477 release_sock(sk); 1478 return -ENOPROTOOPT; 1479 } 1480 release_sock(sk); 1481 1482 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1483 unsigned char ucval = (unsigned char)val; 1484 len = 1; 1485 if (put_user(len, optlen)) 1486 return -EFAULT; 1487 if (copy_to_user(optval, &ucval, 1)) 1488 return -EFAULT; 1489 } else { 1490 len = min_t(unsigned int, sizeof(int), len); 1491 if (put_user(len, optlen)) 1492 return -EFAULT; 1493 if (copy_to_user(optval, &val, len)) 1494 return -EFAULT; 1495 } 1496 return 0; 1497 1498 out: 1499 release_sock(sk); 1500 if (needs_rtnl) 1501 rtnl_unlock(); 1502 return err; 1503 } 1504 1505 int ip_getsockopt(struct sock *sk, int level, 1506 int optname, char __user *optval, int __user *optlen) 1507 { 1508 int err; 1509 1510 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1511 #ifdef CONFIG_NETFILTER 1512 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1513 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1514 !ip_mroute_opt(optname)) { 1515 int len; 1516 1517 if (get_user(len, optlen)) 1518 return -EFAULT; 1519 1520 lock_sock(sk); 1521 err = nf_getsockopt(sk, PF_INET, optname, optval, 1522 &len); 1523 release_sock(sk); 1524 if (err >= 0) 1525 err = put_user(len, optlen); 1526 return err; 1527 } 1528 #endif 1529 return err; 1530 } 1531 EXPORT_SYMBOL(ip_getsockopt); 1532 1533 #ifdef CONFIG_COMPAT 1534 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1535 char __user *optval, int __user *optlen) 1536 { 1537 int err; 1538 1539 if (optname == MCAST_MSFILTER) 1540 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1541 ip_getsockopt); 1542 1543 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1544 MSG_CMSG_COMPAT); 1545 1546 #ifdef CONFIG_NETFILTER 1547 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1548 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1549 !ip_mroute_opt(optname)) { 1550 int len; 1551 1552 if (get_user(len, optlen)) 1553 return -EFAULT; 1554 1555 lock_sock(sk); 1556 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1557 release_sock(sk); 1558 if (err >= 0) 1559 err = put_user(len, optlen); 1560 return err; 1561 } 1562 #endif 1563 return err; 1564 } 1565 EXPORT_SYMBOL(compat_ip_getsockopt); 1566 #endif 1567