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 53static 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 62static 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 68static 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 73static 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 83static 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 100static 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 114static 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 132static 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 154void 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} 220EXPORT_SYMBOL(ip_cmsg_recv_offset); 221 222int 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)); 252 253 /* Our caller is responsible for freeing ipc->opt */ 254 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 255 err < 40 ? err : 40); 256 if (err) 257 return err; 258 break; 259 case IP_PKTINFO: 260 { 261 struct in_pktinfo *info; 262 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 263 return -EINVAL; 264 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 265 ipc->oif = info->ipi_ifindex; 266 ipc->addr = info->ipi_spec_dst.s_addr; 267 break; 268 } 269 case IP_TTL: 270 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 271 return -EINVAL; 272 val = *(int *)CMSG_DATA(cmsg); 273 if (val < 1 || val > 255) 274 return -EINVAL; 275 ipc->ttl = val; 276 break; 277 case IP_TOS: 278 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 279 return -EINVAL; 280 val = *(int *)CMSG_DATA(cmsg); 281 if (val < 0 || val > 255) 282 return -EINVAL; 283 ipc->tos = val; 284 ipc->priority = rt_tos2priority(ipc->tos); 285 break; 286 287 default: 288 return -EINVAL; 289 } 290 } 291 return 0; 292} 293 294 295/* Special input handler for packets caught by router alert option. 296 They are selected only by protocol field, and then processed likely 297 local ones; but only if someone wants them! Otherwise, router 298 not running rsvpd will kill RSVP. 299 300 It is user level problem, what it will make with them. 301 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 302 but receiver should be enough clever f.e. to forward mtrace requests, 303 sent to multicast group to reach destination designated router. 304 */ 305struct ip_ra_chain __rcu *ip_ra_chain; 306static DEFINE_SPINLOCK(ip_ra_lock); 307 308 309static void ip_ra_destroy_rcu(struct rcu_head *head) 310{ 311 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 312 313 sock_put(ra->saved_sk); 314 kfree(ra); 315} 316 317int ip_ra_control(struct sock *sk, unsigned char on, 318 void (*destructor)(struct sock *)) 319{ 320 struct ip_ra_chain *ra, *new_ra; 321 struct ip_ra_chain __rcu **rap; 322 323 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 324 return -EINVAL; 325 326 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 327 328 spin_lock_bh(&ip_ra_lock); 329 for (rap = &ip_ra_chain; 330 (ra = rcu_dereference_protected(*rap, 331 lockdep_is_held(&ip_ra_lock))) != NULL; 332 rap = &ra->next) { 333 if (ra->sk == sk) { 334 if (on) { 335 spin_unlock_bh(&ip_ra_lock); 336 kfree(new_ra); 337 return -EADDRINUSE; 338 } 339 /* dont let ip_call_ra_chain() use sk again */ 340 ra->sk = NULL; 341 RCU_INIT_POINTER(*rap, ra->next); 342 spin_unlock_bh(&ip_ra_lock); 343 344 if (ra->destructor) 345 ra->destructor(sk); 346 /* 347 * Delay sock_put(sk) and kfree(ra) after one rcu grace 348 * period. This guarantee ip_call_ra_chain() dont need 349 * to mess with socket refcounts. 350 */ 351 ra->saved_sk = sk; 352 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 353 return 0; 354 } 355 } 356 if (!new_ra) { 357 spin_unlock_bh(&ip_ra_lock); 358 return -ENOBUFS; 359 } 360 new_ra->sk = sk; 361 new_ra->destructor = destructor; 362 363 RCU_INIT_POINTER(new_ra->next, ra); 364 rcu_assign_pointer(*rap, new_ra); 365 sock_hold(sk); 366 spin_unlock_bh(&ip_ra_lock); 367 368 return 0; 369} 370 371void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 372 __be16 port, u32 info, u8 *payload) 373{ 374 struct sock_exterr_skb *serr; 375 376 skb = skb_clone(skb, GFP_ATOMIC); 377 if (!skb) 378 return; 379 380 serr = SKB_EXT_ERR(skb); 381 serr->ee.ee_errno = err; 382 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 383 serr->ee.ee_type = icmp_hdr(skb)->type; 384 serr->ee.ee_code = icmp_hdr(skb)->code; 385 serr->ee.ee_pad = 0; 386 serr->ee.ee_info = info; 387 serr->ee.ee_data = 0; 388 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 389 skb_network_header(skb); 390 serr->port = port; 391 392 if (skb_pull(skb, payload - skb->data)) { 393 skb_reset_transport_header(skb); 394 if (sock_queue_err_skb(sk, skb) == 0) 395 return; 396 } 397 kfree_skb(skb); 398} 399 400void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 401{ 402 struct inet_sock *inet = inet_sk(sk); 403 struct sock_exterr_skb *serr; 404 struct iphdr *iph; 405 struct sk_buff *skb; 406 407 if (!inet->recverr) 408 return; 409 410 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 411 if (!skb) 412 return; 413 414 skb_put(skb, sizeof(struct iphdr)); 415 skb_reset_network_header(skb); 416 iph = ip_hdr(skb); 417 iph->daddr = daddr; 418 419 serr = SKB_EXT_ERR(skb); 420 serr->ee.ee_errno = err; 421 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 422 serr->ee.ee_type = 0; 423 serr->ee.ee_code = 0; 424 serr->ee.ee_pad = 0; 425 serr->ee.ee_info = info; 426 serr->ee.ee_data = 0; 427 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 428 serr->port = port; 429 430 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 431 skb_reset_transport_header(skb); 432 433 if (sock_queue_err_skb(sk, skb)) 434 kfree_skb(skb); 435} 436 437/* For some errors we have valid addr_offset even with zero payload and 438 * zero port. Also, addr_offset should be supported if port is set. 439 */ 440static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 441{ 442 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 443 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 444} 445 446/* IPv4 supports cmsg on all imcp errors and some timestamps 447 * 448 * Timestamp code paths do not initialize the fields expected by cmsg: 449 * the PKTINFO fields in skb->cb[]. Fill those in here. 450 */ 451static bool ipv4_datagram_support_cmsg(const struct sock *sk, 452 struct sk_buff *skb, 453 int ee_origin) 454{ 455 struct in_pktinfo *info; 456 457 if (ee_origin == SO_EE_ORIGIN_ICMP) 458 return true; 459 460 if (ee_origin == SO_EE_ORIGIN_LOCAL) 461 return false; 462 463 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 464 * timestamp with egress dev. Not possible for packets without dev 465 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 466 */ 467 if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 468 (!skb->dev)) 469 return false; 470 471 info = PKTINFO_SKB_CB(skb); 472 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 473 info->ipi_ifindex = skb->dev->ifindex; 474 return true; 475} 476 477/* 478 * Handle MSG_ERRQUEUE 479 */ 480int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 481{ 482 struct sock_exterr_skb *serr; 483 struct sk_buff *skb; 484 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 485 struct { 486 struct sock_extended_err ee; 487 struct sockaddr_in offender; 488 } errhdr; 489 int err; 490 int copied; 491 492 WARN_ON_ONCE(sk->sk_family == AF_INET6); 493 494 err = -EAGAIN; 495 skb = sock_dequeue_err_skb(sk); 496 if (!skb) 497 goto out; 498 499 copied = skb->len; 500 if (copied > len) { 501 msg->msg_flags |= MSG_TRUNC; 502 copied = len; 503 } 504 err = skb_copy_datagram_msg(skb, 0, msg, copied); 505 if (err) 506 goto out_free_skb; 507 508 sock_recv_timestamp(msg, sk, skb); 509 510 serr = SKB_EXT_ERR(skb); 511 512 if (sin && ipv4_datagram_support_addr(serr)) { 513 sin->sin_family = AF_INET; 514 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 515 serr->addr_offset); 516 sin->sin_port = serr->port; 517 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 518 *addr_len = sizeof(*sin); 519 } 520 521 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 522 sin = &errhdr.offender; 523 memset(sin, 0, sizeof(*sin)); 524 525 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 526 sin->sin_family = AF_INET; 527 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 528 if (inet_sk(sk)->cmsg_flags) 529 ip_cmsg_recv(msg, skb); 530 } 531 532 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 533 534 /* Now we could try to dump offended packet options */ 535 536 msg->msg_flags |= MSG_ERRQUEUE; 537 err = copied; 538 539out_free_skb: 540 kfree_skb(skb); 541out: 542 return err; 543} 544 545 546/* 547 * Socket option code for IP. This is the end of the line after any 548 * TCP,UDP etc options on an IP socket. 549 */ 550static bool setsockopt_needs_rtnl(int optname) 551{ 552 switch (optname) { 553 case IP_ADD_MEMBERSHIP: 554 case IP_ADD_SOURCE_MEMBERSHIP: 555 case IP_BLOCK_SOURCE: 556 case IP_DROP_MEMBERSHIP: 557 case IP_DROP_SOURCE_MEMBERSHIP: 558 case IP_MSFILTER: 559 case IP_UNBLOCK_SOURCE: 560 case MCAST_BLOCK_SOURCE: 561 case MCAST_MSFILTER: 562 case MCAST_JOIN_GROUP: 563 case MCAST_JOIN_SOURCE_GROUP: 564 case MCAST_LEAVE_GROUP: 565 case MCAST_LEAVE_SOURCE_GROUP: 566 case MCAST_UNBLOCK_SOURCE: 567 return true; 568 } 569 return false; 570} 571 572static int do_ip_setsockopt(struct sock *sk, int level, 573 int optname, char __user *optval, unsigned int optlen) 574{ 575 struct inet_sock *inet = inet_sk(sk); 576 int val = 0, err; 577 bool needs_rtnl = setsockopt_needs_rtnl(optname); 578 579 switch (optname) { 580 case IP_PKTINFO: 581 case IP_RECVTTL: 582 case IP_RECVOPTS: 583 case IP_RECVTOS: 584 case IP_RETOPTS: 585 case IP_TOS: 586 case IP_TTL: 587 case IP_HDRINCL: 588 case IP_MTU_DISCOVER: 589 case IP_RECVERR: 590 case IP_ROUTER_ALERT: 591 case IP_FREEBIND: 592 case IP_PASSSEC: 593 case IP_TRANSPARENT: 594 case IP_MINTTL: 595 case IP_NODEFRAG: 596 case IP_UNICAST_IF: 597 case IP_MULTICAST_TTL: 598 case IP_MULTICAST_ALL: 599 case IP_MULTICAST_LOOP: 600 case IP_RECVORIGDSTADDR: 601 case IP_CHECKSUM: 602 if (optlen >= sizeof(int)) { 603 if (get_user(val, (int __user *) optval)) 604 return -EFAULT; 605 } else if (optlen >= sizeof(char)) { 606 unsigned char ucval; 607 608 if (get_user(ucval, (unsigned char __user *) optval)) 609 return -EFAULT; 610 val = (int) ucval; 611 } 612 } 613 614 /* If optlen==0, it is equivalent to val == 0 */ 615 616 if (ip_mroute_opt(optname)) 617 return ip_mroute_setsockopt(sk, optname, optval, optlen); 618 619 err = 0; 620 if (needs_rtnl) 621 rtnl_lock(); 622 lock_sock(sk); 623 624 switch (optname) { 625 case IP_OPTIONS: 626 { 627 struct ip_options_rcu *old, *opt = NULL; 628 629 if (optlen > 40) 630 goto e_inval; 631 err = ip_options_get_from_user(sock_net(sk), &opt, 632 optval, optlen); 633 if (err) 634 break; 635 old = rcu_dereference_protected(inet->inet_opt, 636 sock_owned_by_user(sk)); 637 if (inet->is_icsk) { 638 struct inet_connection_sock *icsk = inet_csk(sk); 639#if IS_ENABLED(CONFIG_IPV6) 640 if (sk->sk_family == PF_INET || 641 (!((1 << sk->sk_state) & 642 (TCPF_LISTEN | TCPF_CLOSE)) && 643 inet->inet_daddr != LOOPBACK4_IPV6)) { 644#endif 645 if (old) 646 icsk->icsk_ext_hdr_len -= old->opt.optlen; 647 if (opt) 648 icsk->icsk_ext_hdr_len += opt->opt.optlen; 649 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 650#if IS_ENABLED(CONFIG_IPV6) 651 } 652#endif 653 } 654 rcu_assign_pointer(inet->inet_opt, opt); 655 if (old) 656 kfree_rcu(old, rcu); 657 break; 658 } 659 case IP_PKTINFO: 660 if (val) 661 inet->cmsg_flags |= IP_CMSG_PKTINFO; 662 else 663 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 664 break; 665 case IP_RECVTTL: 666 if (val) 667 inet->cmsg_flags |= IP_CMSG_TTL; 668 else 669 inet->cmsg_flags &= ~IP_CMSG_TTL; 670 break; 671 case IP_RECVTOS: 672 if (val) 673 inet->cmsg_flags |= IP_CMSG_TOS; 674 else 675 inet->cmsg_flags &= ~IP_CMSG_TOS; 676 break; 677 case IP_RECVOPTS: 678 if (val) 679 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 680 else 681 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 682 break; 683 case IP_RETOPTS: 684 if (val) 685 inet->cmsg_flags |= IP_CMSG_RETOPTS; 686 else 687 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 688 break; 689 case IP_PASSSEC: 690 if (val) 691 inet->cmsg_flags |= IP_CMSG_PASSSEC; 692 else 693 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 694 break; 695 case IP_RECVORIGDSTADDR: 696 if (val) 697 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 698 else 699 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 700 break; 701 case IP_CHECKSUM: 702 if (val) { 703 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 704 inet_inc_convert_csum(sk); 705 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 706 } 707 } else { 708 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 709 inet_dec_convert_csum(sk); 710 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 711 } 712 } 713 break; 714 case IP_TOS: /* This sets both TOS and Precedence */ 715 if (sk->sk_type == SOCK_STREAM) { 716 val &= ~INET_ECN_MASK; 717 val |= inet->tos & INET_ECN_MASK; 718 } 719 if (inet->tos != val) { 720 inet->tos = val; 721 sk->sk_priority = rt_tos2priority(val); 722 sk_dst_reset(sk); 723 } 724 break; 725 case IP_TTL: 726 if (optlen < 1) 727 goto e_inval; 728 if (val != -1 && (val < 1 || val > 255)) 729 goto e_inval; 730 inet->uc_ttl = val; 731 break; 732 case IP_HDRINCL: 733 if (sk->sk_type != SOCK_RAW) { 734 err = -ENOPROTOOPT; 735 break; 736 } 737 inet->hdrincl = val ? 1 : 0; 738 break; 739 case IP_NODEFRAG: 740 if (sk->sk_type != SOCK_RAW) { 741 err = -ENOPROTOOPT; 742 break; 743 } 744 inet->nodefrag = val ? 1 : 0; 745 break; 746 case IP_MTU_DISCOVER: 747 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 748 goto e_inval; 749 inet->pmtudisc = val; 750 break; 751 case IP_RECVERR: 752 inet->recverr = !!val; 753 if (!val) 754 skb_queue_purge(&sk->sk_error_queue); 755 break; 756 case IP_MULTICAST_TTL: 757 if (sk->sk_type == SOCK_STREAM) 758 goto e_inval; 759 if (optlen < 1) 760 goto e_inval; 761 if (val == -1) 762 val = 1; 763 if (val < 0 || val > 255) 764 goto e_inval; 765 inet->mc_ttl = val; 766 break; 767 case IP_MULTICAST_LOOP: 768 if (optlen < 1) 769 goto e_inval; 770 inet->mc_loop = !!val; 771 break; 772 case IP_UNICAST_IF: 773 { 774 struct net_device *dev = NULL; 775 int ifindex; 776 777 if (optlen != sizeof(int)) 778 goto e_inval; 779 780 ifindex = (__force int)ntohl((__force __be32)val); 781 if (ifindex == 0) { 782 inet->uc_index = 0; 783 err = 0; 784 break; 785 } 786 787 dev = dev_get_by_index(sock_net(sk), ifindex); 788 err = -EADDRNOTAVAIL; 789 if (!dev) 790 break; 791 dev_put(dev); 792 793 err = -EINVAL; 794 if (sk->sk_bound_dev_if) 795 break; 796 797 inet->uc_index = ifindex; 798 err = 0; 799 break; 800 } 801 case IP_MULTICAST_IF: 802 { 803 struct ip_mreqn mreq; 804 struct net_device *dev = NULL; 805 806 if (sk->sk_type == SOCK_STREAM) 807 goto e_inval; 808 /* 809 * Check the arguments are allowable 810 */ 811 812 if (optlen < sizeof(struct in_addr)) 813 goto e_inval; 814 815 err = -EFAULT; 816 if (optlen >= sizeof(struct ip_mreqn)) { 817 if (copy_from_user(&mreq, optval, sizeof(mreq))) 818 break; 819 } else { 820 memset(&mreq, 0, sizeof(mreq)); 821 if (optlen >= sizeof(struct ip_mreq)) { 822 if (copy_from_user(&mreq, optval, 823 sizeof(struct ip_mreq))) 824 break; 825 } else if (optlen >= sizeof(struct in_addr)) { 826 if (copy_from_user(&mreq.imr_address, optval, 827 sizeof(struct in_addr))) 828 break; 829 } 830 } 831 832 if (!mreq.imr_ifindex) { 833 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 834 inet->mc_index = 0; 835 inet->mc_addr = 0; 836 err = 0; 837 break; 838 } 839 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 840 if (dev) 841 mreq.imr_ifindex = dev->ifindex; 842 } else 843 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 844 845 846 err = -EADDRNOTAVAIL; 847 if (!dev) 848 break; 849 dev_put(dev); 850 851 err = -EINVAL; 852 if (sk->sk_bound_dev_if && 853 mreq.imr_ifindex != sk->sk_bound_dev_if) 854 break; 855 856 inet->mc_index = mreq.imr_ifindex; 857 inet->mc_addr = mreq.imr_address.s_addr; 858 err = 0; 859 break; 860 } 861 862 case IP_ADD_MEMBERSHIP: 863 case IP_DROP_MEMBERSHIP: 864 { 865 struct ip_mreqn mreq; 866 867 err = -EPROTO; 868 if (inet_sk(sk)->is_icsk) 869 break; 870 871 if (optlen < sizeof(struct ip_mreq)) 872 goto e_inval; 873 err = -EFAULT; 874 if (optlen >= sizeof(struct ip_mreqn)) { 875 if (copy_from_user(&mreq, optval, sizeof(mreq))) 876 break; 877 } else { 878 memset(&mreq, 0, sizeof(mreq)); 879 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 880 break; 881 } 882 883 if (optname == IP_ADD_MEMBERSHIP) 884 err = ip_mc_join_group(sk, &mreq); 885 else 886 err = ip_mc_leave_group(sk, &mreq); 887 break; 888 } 889 case IP_MSFILTER: 890 { 891 struct ip_msfilter *msf; 892 893 if (optlen < IP_MSFILTER_SIZE(0)) 894 goto e_inval; 895 if (optlen > sysctl_optmem_max) { 896 err = -ENOBUFS; 897 break; 898 } 899 msf = kmalloc(optlen, GFP_KERNEL); 900 if (!msf) { 901 err = -ENOBUFS; 902 break; 903 } 904 err = -EFAULT; 905 if (copy_from_user(msf, optval, optlen)) { 906 kfree(msf); 907 break; 908 } 909 /* numsrc >= (1G-4) overflow in 32 bits */ 910 if (msf->imsf_numsrc >= 0x3ffffffcU || 911 msf->imsf_numsrc > sysctl_igmp_max_msf) { 912 kfree(msf); 913 err = -ENOBUFS; 914 break; 915 } 916 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 917 kfree(msf); 918 err = -EINVAL; 919 break; 920 } 921 err = ip_mc_msfilter(sk, msf, 0); 922 kfree(msf); 923 break; 924 } 925 case IP_BLOCK_SOURCE: 926 case IP_UNBLOCK_SOURCE: 927 case IP_ADD_SOURCE_MEMBERSHIP: 928 case IP_DROP_SOURCE_MEMBERSHIP: 929 { 930 struct ip_mreq_source mreqs; 931 int omode, add; 932 933 if (optlen != sizeof(struct ip_mreq_source)) 934 goto e_inval; 935 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 936 err = -EFAULT; 937 break; 938 } 939 if (optname == IP_BLOCK_SOURCE) { 940 omode = MCAST_EXCLUDE; 941 add = 1; 942 } else if (optname == IP_UNBLOCK_SOURCE) { 943 omode = MCAST_EXCLUDE; 944 add = 0; 945 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 946 struct ip_mreqn mreq; 947 948 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 949 mreq.imr_address.s_addr = mreqs.imr_interface; 950 mreq.imr_ifindex = 0; 951 err = ip_mc_join_group(sk, &mreq); 952 if (err && err != -EADDRINUSE) 953 break; 954 omode = MCAST_INCLUDE; 955 add = 1; 956 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 957 omode = MCAST_INCLUDE; 958 add = 0; 959 } 960 err = ip_mc_source(add, omode, sk, &mreqs, 0); 961 break; 962 } 963 case MCAST_JOIN_GROUP: 964 case MCAST_LEAVE_GROUP: 965 { 966 struct group_req greq; 967 struct sockaddr_in *psin; 968 struct ip_mreqn mreq; 969 970 if (optlen < sizeof(struct group_req)) 971 goto e_inval; 972 err = -EFAULT; 973 if (copy_from_user(&greq, optval, sizeof(greq))) 974 break; 975 psin = (struct sockaddr_in *)&greq.gr_group; 976 if (psin->sin_family != AF_INET) 977 goto e_inval; 978 memset(&mreq, 0, sizeof(mreq)); 979 mreq.imr_multiaddr = psin->sin_addr; 980 mreq.imr_ifindex = greq.gr_interface; 981 982 if (optname == MCAST_JOIN_GROUP) 983 err = ip_mc_join_group(sk, &mreq); 984 else 985 err = ip_mc_leave_group(sk, &mreq); 986 break; 987 } 988 case MCAST_JOIN_SOURCE_GROUP: 989 case MCAST_LEAVE_SOURCE_GROUP: 990 case MCAST_BLOCK_SOURCE: 991 case MCAST_UNBLOCK_SOURCE: 992 { 993 struct group_source_req greqs; 994 struct ip_mreq_source mreqs; 995 struct sockaddr_in *psin; 996 int omode, add; 997 998 if (optlen != sizeof(struct group_source_req)) 999 goto e_inval; 1000 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1001 err = -EFAULT; 1002 break; 1003 } 1004 if (greqs.gsr_group.ss_family != AF_INET || 1005 greqs.gsr_source.ss_family != AF_INET) { 1006 err = -EADDRNOTAVAIL; 1007 break; 1008 } 1009 psin = (struct sockaddr_in *)&greqs.gsr_group; 1010 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1011 psin = (struct sockaddr_in *)&greqs.gsr_source; 1012 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1013 mreqs.imr_interface = 0; /* use index for mc_source */ 1014 1015 if (optname == MCAST_BLOCK_SOURCE) { 1016 omode = MCAST_EXCLUDE; 1017 add = 1; 1018 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1019 omode = MCAST_EXCLUDE; 1020 add = 0; 1021 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1022 struct ip_mreqn mreq; 1023 1024 psin = (struct sockaddr_in *)&greqs.gsr_group; 1025 mreq.imr_multiaddr = psin->sin_addr; 1026 mreq.imr_address.s_addr = 0; 1027 mreq.imr_ifindex = greqs.gsr_interface; 1028 err = ip_mc_join_group(sk, &mreq); 1029 if (err && err != -EADDRINUSE) 1030 break; 1031 greqs.gsr_interface = mreq.imr_ifindex; 1032 omode = MCAST_INCLUDE; 1033 add = 1; 1034 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1035 omode = MCAST_INCLUDE; 1036 add = 0; 1037 } 1038 err = ip_mc_source(add, omode, sk, &mreqs, 1039 greqs.gsr_interface); 1040 break; 1041 } 1042 case MCAST_MSFILTER: 1043 { 1044 struct sockaddr_in *psin; 1045 struct ip_msfilter *msf = NULL; 1046 struct group_filter *gsf = NULL; 1047 int msize, i, ifindex; 1048 1049 if (optlen < GROUP_FILTER_SIZE(0)) 1050 goto e_inval; 1051 if (optlen > sysctl_optmem_max) { 1052 err = -ENOBUFS; 1053 break; 1054 } 1055 gsf = kmalloc(optlen, GFP_KERNEL); 1056 if (!gsf) { 1057 err = -ENOBUFS; 1058 break; 1059 } 1060 err = -EFAULT; 1061 if (copy_from_user(gsf, optval, optlen)) 1062 goto mc_msf_out; 1063 1064 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1065 if (gsf->gf_numsrc >= 0x1ffffff || 1066 gsf->gf_numsrc > sysctl_igmp_max_msf) { 1067 err = -ENOBUFS; 1068 goto mc_msf_out; 1069 } 1070 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1071 err = -EINVAL; 1072 goto mc_msf_out; 1073 } 1074 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1075 msf = kmalloc(msize, GFP_KERNEL); 1076 if (!msf) { 1077 err = -ENOBUFS; 1078 goto mc_msf_out; 1079 } 1080 ifindex = gsf->gf_interface; 1081 psin = (struct sockaddr_in *)&gsf->gf_group; 1082 if (psin->sin_family != AF_INET) { 1083 err = -EADDRNOTAVAIL; 1084 goto mc_msf_out; 1085 } 1086 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1087 msf->imsf_interface = 0; 1088 msf->imsf_fmode = gsf->gf_fmode; 1089 msf->imsf_numsrc = gsf->gf_numsrc; 1090 err = -EADDRNOTAVAIL; 1091 for (i = 0; i < gsf->gf_numsrc; ++i) { 1092 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1093 1094 if (psin->sin_family != AF_INET) 1095 goto mc_msf_out; 1096 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1097 } 1098 kfree(gsf); 1099 gsf = NULL; 1100 1101 err = ip_mc_msfilter(sk, msf, ifindex); 1102mc_msf_out: 1103 kfree(msf); 1104 kfree(gsf); 1105 break; 1106 } 1107 case IP_MULTICAST_ALL: 1108 if (optlen < 1) 1109 goto e_inval; 1110 if (val != 0 && val != 1) 1111 goto e_inval; 1112 inet->mc_all = val; 1113 break; 1114 case IP_ROUTER_ALERT: 1115 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1116 break; 1117 1118 case IP_FREEBIND: 1119 if (optlen < 1) 1120 goto e_inval; 1121 inet->freebind = !!val; 1122 break; 1123 1124 case IP_IPSEC_POLICY: 1125 case IP_XFRM_POLICY: 1126 err = -EPERM; 1127 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1128 break; 1129 err = xfrm_user_policy(sk, optname, optval, optlen); 1130 break; 1131 1132 case IP_TRANSPARENT: 1133 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1134 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1135 err = -EPERM; 1136 break; 1137 } 1138 if (optlen < 1) 1139 goto e_inval; 1140 inet->transparent = !!val; 1141 break; 1142 1143 case IP_MINTTL: 1144 if (optlen < 1) 1145 goto e_inval; 1146 if (val < 0 || val > 255) 1147 goto e_inval; 1148 inet->min_ttl = val; 1149 break; 1150 1151 default: 1152 err = -ENOPROTOOPT; 1153 break; 1154 } 1155 release_sock(sk); 1156 if (needs_rtnl) 1157 rtnl_unlock(); 1158 return err; 1159 1160e_inval: 1161 release_sock(sk); 1162 if (needs_rtnl) 1163 rtnl_unlock(); 1164 return -EINVAL; 1165} 1166 1167/** 1168 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1169 * @sk: socket 1170 * @skb: buffer 1171 * 1172 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1173 * destination in skb->cb[] before dst drop. 1174 * This way, receiver doesn't make cache line misses to read rtable. 1175 */ 1176void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1177{ 1178 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1179 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1180 ipv6_sk_rxinfo(sk); 1181 1182 if (prepare && skb_rtable(skb)) { 1183 pktinfo->ipi_ifindex = inet_iif(skb); 1184 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1185 } else { 1186 pktinfo->ipi_ifindex = 0; 1187 pktinfo->ipi_spec_dst.s_addr = 0; 1188 } 1189 skb_dst_drop(skb); 1190} 1191 1192int ip_setsockopt(struct sock *sk, int level, 1193 int optname, char __user *optval, unsigned int optlen) 1194{ 1195 int err; 1196 1197 if (level != SOL_IP) 1198 return -ENOPROTOOPT; 1199 1200 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1201#ifdef CONFIG_NETFILTER 1202 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1203 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1204 optname != IP_IPSEC_POLICY && 1205 optname != IP_XFRM_POLICY && 1206 !ip_mroute_opt(optname)) { 1207 lock_sock(sk); 1208 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1209 release_sock(sk); 1210 } 1211#endif 1212 return err; 1213} 1214EXPORT_SYMBOL(ip_setsockopt); 1215 1216#ifdef CONFIG_COMPAT 1217int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1218 char __user *optval, unsigned int optlen) 1219{ 1220 int err; 1221 1222 if (level != SOL_IP) 1223 return -ENOPROTOOPT; 1224 1225 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1226 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1227 ip_setsockopt); 1228 1229 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1230#ifdef CONFIG_NETFILTER 1231 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1232 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1233 optname != IP_IPSEC_POLICY && 1234 optname != IP_XFRM_POLICY && 1235 !ip_mroute_opt(optname)) { 1236 lock_sock(sk); 1237 err = compat_nf_setsockopt(sk, PF_INET, optname, 1238 optval, optlen); 1239 release_sock(sk); 1240 } 1241#endif 1242 return err; 1243} 1244EXPORT_SYMBOL(compat_ip_setsockopt); 1245#endif 1246 1247/* 1248 * Get the options. Note for future reference. The GET of IP options gets 1249 * the _received_ ones. The set sets the _sent_ ones. 1250 */ 1251 1252static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1253 char __user *optval, int __user *optlen, unsigned int flags) 1254{ 1255 struct inet_sock *inet = inet_sk(sk); 1256 int val; 1257 int len; 1258 1259 if (level != SOL_IP) 1260 return -EOPNOTSUPP; 1261 1262 if (ip_mroute_opt(optname)) 1263 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1264 1265 if (get_user(len, optlen)) 1266 return -EFAULT; 1267 if (len < 0) 1268 return -EINVAL; 1269 1270 lock_sock(sk); 1271 1272 switch (optname) { 1273 case IP_OPTIONS: 1274 { 1275 unsigned char optbuf[sizeof(struct ip_options)+40]; 1276 struct ip_options *opt = (struct ip_options *)optbuf; 1277 struct ip_options_rcu *inet_opt; 1278 1279 inet_opt = rcu_dereference_protected(inet->inet_opt, 1280 sock_owned_by_user(sk)); 1281 opt->optlen = 0; 1282 if (inet_opt) 1283 memcpy(optbuf, &inet_opt->opt, 1284 sizeof(struct ip_options) + 1285 inet_opt->opt.optlen); 1286 release_sock(sk); 1287 1288 if (opt->optlen == 0) 1289 return put_user(0, optlen); 1290 1291 ip_options_undo(opt); 1292 1293 len = min_t(unsigned int, len, opt->optlen); 1294 if (put_user(len, optlen)) 1295 return -EFAULT; 1296 if (copy_to_user(optval, opt->__data, len)) 1297 return -EFAULT; 1298 return 0; 1299 } 1300 case IP_PKTINFO: 1301 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1302 break; 1303 case IP_RECVTTL: 1304 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1305 break; 1306 case IP_RECVTOS: 1307 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1308 break; 1309 case IP_RECVOPTS: 1310 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1311 break; 1312 case IP_RETOPTS: 1313 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1314 break; 1315 case IP_PASSSEC: 1316 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1317 break; 1318 case IP_RECVORIGDSTADDR: 1319 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1320 break; 1321 case IP_CHECKSUM: 1322 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1323 break; 1324 case IP_TOS: 1325 val = inet->tos; 1326 break; 1327 case IP_TTL: 1328 val = (inet->uc_ttl == -1 ? 1329 sysctl_ip_default_ttl : 1330 inet->uc_ttl); 1331 break; 1332 case IP_HDRINCL: 1333 val = inet->hdrincl; 1334 break; 1335 case IP_NODEFRAG: 1336 val = inet->nodefrag; 1337 break; 1338 case IP_MTU_DISCOVER: 1339 val = inet->pmtudisc; 1340 break; 1341 case IP_MTU: 1342 { 1343 struct dst_entry *dst; 1344 val = 0; 1345 dst = sk_dst_get(sk); 1346 if (dst) { 1347 val = dst_mtu(dst); 1348 dst_release(dst); 1349 } 1350 if (!val) { 1351 release_sock(sk); 1352 return -ENOTCONN; 1353 } 1354 break; 1355 } 1356 case IP_RECVERR: 1357 val = inet->recverr; 1358 break; 1359 case IP_MULTICAST_TTL: 1360 val = inet->mc_ttl; 1361 break; 1362 case IP_MULTICAST_LOOP: 1363 val = inet->mc_loop; 1364 break; 1365 case IP_UNICAST_IF: 1366 val = (__force int)htonl((__u32) inet->uc_index); 1367 break; 1368 case IP_MULTICAST_IF: 1369 { 1370 struct in_addr addr; 1371 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1372 addr.s_addr = inet->mc_addr; 1373 release_sock(sk); 1374 1375 if (put_user(len, optlen)) 1376 return -EFAULT; 1377 if (copy_to_user(optval, &addr, len)) 1378 return -EFAULT; 1379 return 0; 1380 } 1381 case IP_MSFILTER: 1382 { 1383 struct ip_msfilter msf; 1384 int err; 1385 1386 if (len < IP_MSFILTER_SIZE(0)) { 1387 release_sock(sk); 1388 return -EINVAL; 1389 } 1390 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1391 release_sock(sk); 1392 return -EFAULT; 1393 } 1394 err = ip_mc_msfget(sk, &msf, 1395 (struct ip_msfilter __user *)optval, optlen); 1396 release_sock(sk); 1397 return err; 1398 } 1399 case MCAST_MSFILTER: 1400 { 1401 struct group_filter gsf; 1402 int err; 1403 1404 if (len < GROUP_FILTER_SIZE(0)) { 1405 release_sock(sk); 1406 return -EINVAL; 1407 } 1408 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1409 release_sock(sk); 1410 return -EFAULT; 1411 } 1412 err = ip_mc_gsfget(sk, &gsf, 1413 (struct group_filter __user *)optval, 1414 optlen); 1415 release_sock(sk); 1416 return err; 1417 } 1418 case IP_MULTICAST_ALL: 1419 val = inet->mc_all; 1420 break; 1421 case IP_PKTOPTIONS: 1422 { 1423 struct msghdr msg; 1424 1425 release_sock(sk); 1426 1427 if (sk->sk_type != SOCK_STREAM) 1428 return -ENOPROTOOPT; 1429 1430 msg.msg_control = (__force void *) optval; 1431 msg.msg_controllen = len; 1432 msg.msg_flags = flags; 1433 1434 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1435 struct in_pktinfo info; 1436 1437 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1438 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1439 info.ipi_ifindex = inet->mc_index; 1440 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1441 } 1442 if (inet->cmsg_flags & IP_CMSG_TTL) { 1443 int hlim = inet->mc_ttl; 1444 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1445 } 1446 if (inet->cmsg_flags & IP_CMSG_TOS) { 1447 int tos = inet->rcv_tos; 1448 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1449 } 1450 len -= msg.msg_controllen; 1451 return put_user(len, optlen); 1452 } 1453 case IP_FREEBIND: 1454 val = inet->freebind; 1455 break; 1456 case IP_TRANSPARENT: 1457 val = inet->transparent; 1458 break; 1459 case IP_MINTTL: 1460 val = inet->min_ttl; 1461 break; 1462 default: 1463 release_sock(sk); 1464 return -ENOPROTOOPT; 1465 } 1466 release_sock(sk); 1467 1468 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1469 unsigned char ucval = (unsigned char)val; 1470 len = 1; 1471 if (put_user(len, optlen)) 1472 return -EFAULT; 1473 if (copy_to_user(optval, &ucval, 1)) 1474 return -EFAULT; 1475 } else { 1476 len = min_t(unsigned int, sizeof(int), len); 1477 if (put_user(len, optlen)) 1478 return -EFAULT; 1479 if (copy_to_user(optval, &val, len)) 1480 return -EFAULT; 1481 } 1482 return 0; 1483} 1484 1485int ip_getsockopt(struct sock *sk, int level, 1486 int optname, char __user *optval, int __user *optlen) 1487{ 1488 int err; 1489 1490 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1491#ifdef CONFIG_NETFILTER 1492 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1493 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1494 !ip_mroute_opt(optname)) { 1495 int len; 1496 1497 if (get_user(len, optlen)) 1498 return -EFAULT; 1499 1500 lock_sock(sk); 1501 err = nf_getsockopt(sk, PF_INET, optname, optval, 1502 &len); 1503 release_sock(sk); 1504 if (err >= 0) 1505 err = put_user(len, optlen); 1506 return err; 1507 } 1508#endif 1509 return err; 1510} 1511EXPORT_SYMBOL(ip_getsockopt); 1512 1513#ifdef CONFIG_COMPAT 1514int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1515 char __user *optval, int __user *optlen) 1516{ 1517 int err; 1518 1519 if (optname == MCAST_MSFILTER) 1520 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1521 ip_getsockopt); 1522 1523 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1524 MSG_CMSG_COMPAT); 1525 1526#ifdef CONFIG_NETFILTER 1527 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1528 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1529 !ip_mroute_opt(optname)) { 1530 int len; 1531 1532 if (get_user(len, optlen)) 1533 return -EFAULT; 1534 1535 lock_sock(sk); 1536 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1537 release_sock(sk); 1538 if (err >= 0) 1539 err = put_user(len, optlen); 1540 return err; 1541 } 1542#endif 1543 return err; 1544} 1545EXPORT_SYMBOL(compat_ip_getsockopt); 1546#endif 1547