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 == NULL) { 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) != NULL) { 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 static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk, 436 const struct sk_buff *skb, 437 int ee_origin) 438 { 439 struct in_pktinfo *info = PKTINFO_SKB_CB(skb); 440 441 if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) || 442 (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 443 (!skb->dev)) 444 return false; 445 446 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 447 info->ipi_ifindex = skb->dev->ifindex; 448 return true; 449 } 450 451 /* 452 * Handle MSG_ERRQUEUE 453 */ 454 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 455 { 456 struct sock_exterr_skb *serr; 457 struct sk_buff *skb; 458 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 459 struct { 460 struct sock_extended_err ee; 461 struct sockaddr_in offender; 462 } errhdr; 463 int err; 464 int copied; 465 466 WARN_ON_ONCE(sk->sk_family == AF_INET6); 467 468 err = -EAGAIN; 469 skb = sock_dequeue_err_skb(sk); 470 if (skb == NULL) 471 goto out; 472 473 copied = skb->len; 474 if (copied > len) { 475 msg->msg_flags |= MSG_TRUNC; 476 copied = len; 477 } 478 err = skb_copy_datagram_msg(skb, 0, msg, copied); 479 if (err) 480 goto out_free_skb; 481 482 sock_recv_timestamp(msg, sk, skb); 483 484 serr = SKB_EXT_ERR(skb); 485 486 if (sin && skb->len) { 487 sin->sin_family = AF_INET; 488 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 489 serr->addr_offset); 490 sin->sin_port = serr->port; 491 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 492 *addr_len = sizeof(*sin); 493 } 494 495 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 496 sin = &errhdr.offender; 497 memset(sin, 0, sizeof(*sin)); 498 499 if (skb->len && 500 (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 501 ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin))) { 502 sin->sin_family = AF_INET; 503 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 504 if (inet_sk(sk)->cmsg_flags) 505 ip_cmsg_recv(msg, skb); 506 } 507 508 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 509 510 /* Now we could try to dump offended packet options */ 511 512 msg->msg_flags |= MSG_ERRQUEUE; 513 err = copied; 514 515 out_free_skb: 516 kfree_skb(skb); 517 out: 518 return err; 519 } 520 521 522 /* 523 * Socket option code for IP. This is the end of the line after any 524 * TCP,UDP etc options on an IP socket. 525 */ 526 527 static int do_ip_setsockopt(struct sock *sk, int level, 528 int optname, char __user *optval, unsigned int optlen) 529 { 530 struct inet_sock *inet = inet_sk(sk); 531 int val = 0, err; 532 533 switch (optname) { 534 case IP_PKTINFO: 535 case IP_RECVTTL: 536 case IP_RECVOPTS: 537 case IP_RECVTOS: 538 case IP_RETOPTS: 539 case IP_TOS: 540 case IP_TTL: 541 case IP_HDRINCL: 542 case IP_MTU_DISCOVER: 543 case IP_RECVERR: 544 case IP_ROUTER_ALERT: 545 case IP_FREEBIND: 546 case IP_PASSSEC: 547 case IP_TRANSPARENT: 548 case IP_MINTTL: 549 case IP_NODEFRAG: 550 case IP_UNICAST_IF: 551 case IP_MULTICAST_TTL: 552 case IP_MULTICAST_ALL: 553 case IP_MULTICAST_LOOP: 554 case IP_RECVORIGDSTADDR: 555 case IP_CHECKSUM: 556 if (optlen >= sizeof(int)) { 557 if (get_user(val, (int __user *) optval)) 558 return -EFAULT; 559 } else if (optlen >= sizeof(char)) { 560 unsigned char ucval; 561 562 if (get_user(ucval, (unsigned char __user *) optval)) 563 return -EFAULT; 564 val = (int) ucval; 565 } 566 } 567 568 /* If optlen==0, it is equivalent to val == 0 */ 569 570 if (ip_mroute_opt(optname)) 571 return ip_mroute_setsockopt(sk, optname, optval, optlen); 572 573 err = 0; 574 lock_sock(sk); 575 576 switch (optname) { 577 case IP_OPTIONS: 578 { 579 struct ip_options_rcu *old, *opt = NULL; 580 581 if (optlen > 40) 582 goto e_inval; 583 err = ip_options_get_from_user(sock_net(sk), &opt, 584 optval, optlen); 585 if (err) 586 break; 587 old = rcu_dereference_protected(inet->inet_opt, 588 sock_owned_by_user(sk)); 589 if (inet->is_icsk) { 590 struct inet_connection_sock *icsk = inet_csk(sk); 591 #if IS_ENABLED(CONFIG_IPV6) 592 if (sk->sk_family == PF_INET || 593 (!((1 << sk->sk_state) & 594 (TCPF_LISTEN | TCPF_CLOSE)) && 595 inet->inet_daddr != LOOPBACK4_IPV6)) { 596 #endif 597 if (old) 598 icsk->icsk_ext_hdr_len -= old->opt.optlen; 599 if (opt) 600 icsk->icsk_ext_hdr_len += opt->opt.optlen; 601 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 602 #if IS_ENABLED(CONFIG_IPV6) 603 } 604 #endif 605 } 606 rcu_assign_pointer(inet->inet_opt, opt); 607 if (old) 608 kfree_rcu(old, rcu); 609 break; 610 } 611 case IP_PKTINFO: 612 if (val) 613 inet->cmsg_flags |= IP_CMSG_PKTINFO; 614 else 615 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 616 break; 617 case IP_RECVTTL: 618 if (val) 619 inet->cmsg_flags |= IP_CMSG_TTL; 620 else 621 inet->cmsg_flags &= ~IP_CMSG_TTL; 622 break; 623 case IP_RECVTOS: 624 if (val) 625 inet->cmsg_flags |= IP_CMSG_TOS; 626 else 627 inet->cmsg_flags &= ~IP_CMSG_TOS; 628 break; 629 case IP_RECVOPTS: 630 if (val) 631 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 632 else 633 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 634 break; 635 case IP_RETOPTS: 636 if (val) 637 inet->cmsg_flags |= IP_CMSG_RETOPTS; 638 else 639 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 640 break; 641 case IP_PASSSEC: 642 if (val) 643 inet->cmsg_flags |= IP_CMSG_PASSSEC; 644 else 645 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 646 break; 647 case IP_RECVORIGDSTADDR: 648 if (val) 649 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 650 else 651 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 652 break; 653 case IP_CHECKSUM: 654 if (val) { 655 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 656 inet_inc_convert_csum(sk); 657 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 658 } 659 } else { 660 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 661 inet_dec_convert_csum(sk); 662 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 663 } 664 } 665 break; 666 case IP_TOS: /* This sets both TOS and Precedence */ 667 if (sk->sk_type == SOCK_STREAM) { 668 val &= ~INET_ECN_MASK; 669 val |= inet->tos & INET_ECN_MASK; 670 } 671 if (inet->tos != val) { 672 inet->tos = val; 673 sk->sk_priority = rt_tos2priority(val); 674 sk_dst_reset(sk); 675 } 676 break; 677 case IP_TTL: 678 if (optlen < 1) 679 goto e_inval; 680 if (val != -1 && (val < 1 || val > 255)) 681 goto e_inval; 682 inet->uc_ttl = val; 683 break; 684 case IP_HDRINCL: 685 if (sk->sk_type != SOCK_RAW) { 686 err = -ENOPROTOOPT; 687 break; 688 } 689 inet->hdrincl = val ? 1 : 0; 690 break; 691 case IP_NODEFRAG: 692 if (sk->sk_type != SOCK_RAW) { 693 err = -ENOPROTOOPT; 694 break; 695 } 696 inet->nodefrag = val ? 1 : 0; 697 break; 698 case IP_MTU_DISCOVER: 699 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 700 goto e_inval; 701 inet->pmtudisc = val; 702 break; 703 case IP_RECVERR: 704 inet->recverr = !!val; 705 if (!val) 706 skb_queue_purge(&sk->sk_error_queue); 707 break; 708 case IP_MULTICAST_TTL: 709 if (sk->sk_type == SOCK_STREAM) 710 goto e_inval; 711 if (optlen < 1) 712 goto e_inval; 713 if (val == -1) 714 val = 1; 715 if (val < 0 || val > 255) 716 goto e_inval; 717 inet->mc_ttl = val; 718 break; 719 case IP_MULTICAST_LOOP: 720 if (optlen < 1) 721 goto e_inval; 722 inet->mc_loop = !!val; 723 break; 724 case IP_UNICAST_IF: 725 { 726 struct net_device *dev = NULL; 727 int ifindex; 728 729 if (optlen != sizeof(int)) 730 goto e_inval; 731 732 ifindex = (__force int)ntohl((__force __be32)val); 733 if (ifindex == 0) { 734 inet->uc_index = 0; 735 err = 0; 736 break; 737 } 738 739 dev = dev_get_by_index(sock_net(sk), ifindex); 740 err = -EADDRNOTAVAIL; 741 if (!dev) 742 break; 743 dev_put(dev); 744 745 err = -EINVAL; 746 if (sk->sk_bound_dev_if) 747 break; 748 749 inet->uc_index = ifindex; 750 err = 0; 751 break; 752 } 753 case IP_MULTICAST_IF: 754 { 755 struct ip_mreqn mreq; 756 struct net_device *dev = NULL; 757 758 if (sk->sk_type == SOCK_STREAM) 759 goto e_inval; 760 /* 761 * Check the arguments are allowable 762 */ 763 764 if (optlen < sizeof(struct in_addr)) 765 goto e_inval; 766 767 err = -EFAULT; 768 if (optlen >= sizeof(struct ip_mreqn)) { 769 if (copy_from_user(&mreq, optval, sizeof(mreq))) 770 break; 771 } else { 772 memset(&mreq, 0, sizeof(mreq)); 773 if (optlen >= sizeof(struct ip_mreq)) { 774 if (copy_from_user(&mreq, optval, 775 sizeof(struct ip_mreq))) 776 break; 777 } else if (optlen >= sizeof(struct in_addr)) { 778 if (copy_from_user(&mreq.imr_address, optval, 779 sizeof(struct in_addr))) 780 break; 781 } 782 } 783 784 if (!mreq.imr_ifindex) { 785 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 786 inet->mc_index = 0; 787 inet->mc_addr = 0; 788 err = 0; 789 break; 790 } 791 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 792 if (dev) 793 mreq.imr_ifindex = dev->ifindex; 794 } else 795 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 796 797 798 err = -EADDRNOTAVAIL; 799 if (!dev) 800 break; 801 dev_put(dev); 802 803 err = -EINVAL; 804 if (sk->sk_bound_dev_if && 805 mreq.imr_ifindex != sk->sk_bound_dev_if) 806 break; 807 808 inet->mc_index = mreq.imr_ifindex; 809 inet->mc_addr = mreq.imr_address.s_addr; 810 err = 0; 811 break; 812 } 813 814 case IP_ADD_MEMBERSHIP: 815 case IP_DROP_MEMBERSHIP: 816 { 817 struct ip_mreqn mreq; 818 819 err = -EPROTO; 820 if (inet_sk(sk)->is_icsk) 821 break; 822 823 if (optlen < sizeof(struct ip_mreq)) 824 goto e_inval; 825 err = -EFAULT; 826 if (optlen >= sizeof(struct ip_mreqn)) { 827 if (copy_from_user(&mreq, optval, sizeof(mreq))) 828 break; 829 } else { 830 memset(&mreq, 0, sizeof(mreq)); 831 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 832 break; 833 } 834 835 if (optname == IP_ADD_MEMBERSHIP) 836 err = ip_mc_join_group(sk, &mreq); 837 else 838 err = ip_mc_leave_group(sk, &mreq); 839 break; 840 } 841 case IP_MSFILTER: 842 { 843 struct ip_msfilter *msf; 844 845 if (optlen < IP_MSFILTER_SIZE(0)) 846 goto e_inval; 847 if (optlen > sysctl_optmem_max) { 848 err = -ENOBUFS; 849 break; 850 } 851 msf = kmalloc(optlen, GFP_KERNEL); 852 if (!msf) { 853 err = -ENOBUFS; 854 break; 855 } 856 err = -EFAULT; 857 if (copy_from_user(msf, optval, optlen)) { 858 kfree(msf); 859 break; 860 } 861 /* numsrc >= (1G-4) overflow in 32 bits */ 862 if (msf->imsf_numsrc >= 0x3ffffffcU || 863 msf->imsf_numsrc > sysctl_igmp_max_msf) { 864 kfree(msf); 865 err = -ENOBUFS; 866 break; 867 } 868 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 869 kfree(msf); 870 err = -EINVAL; 871 break; 872 } 873 err = ip_mc_msfilter(sk, msf, 0); 874 kfree(msf); 875 break; 876 } 877 case IP_BLOCK_SOURCE: 878 case IP_UNBLOCK_SOURCE: 879 case IP_ADD_SOURCE_MEMBERSHIP: 880 case IP_DROP_SOURCE_MEMBERSHIP: 881 { 882 struct ip_mreq_source mreqs; 883 int omode, add; 884 885 if (optlen != sizeof(struct ip_mreq_source)) 886 goto e_inval; 887 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 888 err = -EFAULT; 889 break; 890 } 891 if (optname == IP_BLOCK_SOURCE) { 892 omode = MCAST_EXCLUDE; 893 add = 1; 894 } else if (optname == IP_UNBLOCK_SOURCE) { 895 omode = MCAST_EXCLUDE; 896 add = 0; 897 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 898 struct ip_mreqn mreq; 899 900 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 901 mreq.imr_address.s_addr = mreqs.imr_interface; 902 mreq.imr_ifindex = 0; 903 err = ip_mc_join_group(sk, &mreq); 904 if (err && err != -EADDRINUSE) 905 break; 906 omode = MCAST_INCLUDE; 907 add = 1; 908 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 909 omode = MCAST_INCLUDE; 910 add = 0; 911 } 912 err = ip_mc_source(add, omode, sk, &mreqs, 0); 913 break; 914 } 915 case MCAST_JOIN_GROUP: 916 case MCAST_LEAVE_GROUP: 917 { 918 struct group_req greq; 919 struct sockaddr_in *psin; 920 struct ip_mreqn mreq; 921 922 if (optlen < sizeof(struct group_req)) 923 goto e_inval; 924 err = -EFAULT; 925 if (copy_from_user(&greq, optval, sizeof(greq))) 926 break; 927 psin = (struct sockaddr_in *)&greq.gr_group; 928 if (psin->sin_family != AF_INET) 929 goto e_inval; 930 memset(&mreq, 0, sizeof(mreq)); 931 mreq.imr_multiaddr = psin->sin_addr; 932 mreq.imr_ifindex = greq.gr_interface; 933 934 if (optname == MCAST_JOIN_GROUP) 935 err = ip_mc_join_group(sk, &mreq); 936 else 937 err = ip_mc_leave_group(sk, &mreq); 938 break; 939 } 940 case MCAST_JOIN_SOURCE_GROUP: 941 case MCAST_LEAVE_SOURCE_GROUP: 942 case MCAST_BLOCK_SOURCE: 943 case MCAST_UNBLOCK_SOURCE: 944 { 945 struct group_source_req greqs; 946 struct ip_mreq_source mreqs; 947 struct sockaddr_in *psin; 948 int omode, add; 949 950 if (optlen != sizeof(struct group_source_req)) 951 goto e_inval; 952 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 953 err = -EFAULT; 954 break; 955 } 956 if (greqs.gsr_group.ss_family != AF_INET || 957 greqs.gsr_source.ss_family != AF_INET) { 958 err = -EADDRNOTAVAIL; 959 break; 960 } 961 psin = (struct sockaddr_in *)&greqs.gsr_group; 962 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 963 psin = (struct sockaddr_in *)&greqs.gsr_source; 964 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 965 mreqs.imr_interface = 0; /* use index for mc_source */ 966 967 if (optname == MCAST_BLOCK_SOURCE) { 968 omode = MCAST_EXCLUDE; 969 add = 1; 970 } else if (optname == MCAST_UNBLOCK_SOURCE) { 971 omode = MCAST_EXCLUDE; 972 add = 0; 973 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 974 struct ip_mreqn mreq; 975 976 psin = (struct sockaddr_in *)&greqs.gsr_group; 977 mreq.imr_multiaddr = psin->sin_addr; 978 mreq.imr_address.s_addr = 0; 979 mreq.imr_ifindex = greqs.gsr_interface; 980 err = ip_mc_join_group(sk, &mreq); 981 if (err && err != -EADDRINUSE) 982 break; 983 greqs.gsr_interface = mreq.imr_ifindex; 984 omode = MCAST_INCLUDE; 985 add = 1; 986 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 987 omode = MCAST_INCLUDE; 988 add = 0; 989 } 990 err = ip_mc_source(add, omode, sk, &mreqs, 991 greqs.gsr_interface); 992 break; 993 } 994 case MCAST_MSFILTER: 995 { 996 struct sockaddr_in *psin; 997 struct ip_msfilter *msf = NULL; 998 struct group_filter *gsf = NULL; 999 int msize, i, ifindex; 1000 1001 if (optlen < GROUP_FILTER_SIZE(0)) 1002 goto e_inval; 1003 if (optlen > sysctl_optmem_max) { 1004 err = -ENOBUFS; 1005 break; 1006 } 1007 gsf = kmalloc(optlen, GFP_KERNEL); 1008 if (!gsf) { 1009 err = -ENOBUFS; 1010 break; 1011 } 1012 err = -EFAULT; 1013 if (copy_from_user(gsf, optval, optlen)) 1014 goto mc_msf_out; 1015 1016 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1017 if (gsf->gf_numsrc >= 0x1ffffff || 1018 gsf->gf_numsrc > sysctl_igmp_max_msf) { 1019 err = -ENOBUFS; 1020 goto mc_msf_out; 1021 } 1022 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1023 err = -EINVAL; 1024 goto mc_msf_out; 1025 } 1026 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1027 msf = kmalloc(msize, GFP_KERNEL); 1028 if (!msf) { 1029 err = -ENOBUFS; 1030 goto mc_msf_out; 1031 } 1032 ifindex = gsf->gf_interface; 1033 psin = (struct sockaddr_in *)&gsf->gf_group; 1034 if (psin->sin_family != AF_INET) { 1035 err = -EADDRNOTAVAIL; 1036 goto mc_msf_out; 1037 } 1038 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1039 msf->imsf_interface = 0; 1040 msf->imsf_fmode = gsf->gf_fmode; 1041 msf->imsf_numsrc = gsf->gf_numsrc; 1042 err = -EADDRNOTAVAIL; 1043 for (i = 0; i < gsf->gf_numsrc; ++i) { 1044 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1045 1046 if (psin->sin_family != AF_INET) 1047 goto mc_msf_out; 1048 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1049 } 1050 kfree(gsf); 1051 gsf = NULL; 1052 1053 err = ip_mc_msfilter(sk, msf, ifindex); 1054 mc_msf_out: 1055 kfree(msf); 1056 kfree(gsf); 1057 break; 1058 } 1059 case IP_MULTICAST_ALL: 1060 if (optlen < 1) 1061 goto e_inval; 1062 if (val != 0 && val != 1) 1063 goto e_inval; 1064 inet->mc_all = val; 1065 break; 1066 case IP_ROUTER_ALERT: 1067 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1068 break; 1069 1070 case IP_FREEBIND: 1071 if (optlen < 1) 1072 goto e_inval; 1073 inet->freebind = !!val; 1074 break; 1075 1076 case IP_IPSEC_POLICY: 1077 case IP_XFRM_POLICY: 1078 err = -EPERM; 1079 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1080 break; 1081 err = xfrm_user_policy(sk, optname, optval, optlen); 1082 break; 1083 1084 case IP_TRANSPARENT: 1085 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1086 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1087 err = -EPERM; 1088 break; 1089 } 1090 if (optlen < 1) 1091 goto e_inval; 1092 inet->transparent = !!val; 1093 break; 1094 1095 case IP_MINTTL: 1096 if (optlen < 1) 1097 goto e_inval; 1098 if (val < 0 || val > 255) 1099 goto e_inval; 1100 inet->min_ttl = val; 1101 break; 1102 1103 default: 1104 err = -ENOPROTOOPT; 1105 break; 1106 } 1107 release_sock(sk); 1108 return err; 1109 1110 e_inval: 1111 release_sock(sk); 1112 return -EINVAL; 1113 } 1114 1115 /** 1116 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1117 * @sk: socket 1118 * @skb: buffer 1119 * 1120 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1121 * destination in skb->cb[] before dst drop. 1122 * This way, receiver doesn't make cache line misses to read rtable. 1123 */ 1124 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1125 { 1126 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1127 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1128 ipv6_sk_rxinfo(sk); 1129 1130 if (prepare && skb_rtable(skb)) { 1131 pktinfo->ipi_ifindex = inet_iif(skb); 1132 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1133 } else { 1134 pktinfo->ipi_ifindex = 0; 1135 pktinfo->ipi_spec_dst.s_addr = 0; 1136 } 1137 skb_dst_drop(skb); 1138 } 1139 1140 int ip_setsockopt(struct sock *sk, int level, 1141 int optname, char __user *optval, unsigned int optlen) 1142 { 1143 int err; 1144 1145 if (level != SOL_IP) 1146 return -ENOPROTOOPT; 1147 1148 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1149 #ifdef CONFIG_NETFILTER 1150 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1151 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1152 optname != IP_IPSEC_POLICY && 1153 optname != IP_XFRM_POLICY && 1154 !ip_mroute_opt(optname)) { 1155 lock_sock(sk); 1156 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1157 release_sock(sk); 1158 } 1159 #endif 1160 return err; 1161 } 1162 EXPORT_SYMBOL(ip_setsockopt); 1163 1164 #ifdef CONFIG_COMPAT 1165 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1166 char __user *optval, unsigned int optlen) 1167 { 1168 int err; 1169 1170 if (level != SOL_IP) 1171 return -ENOPROTOOPT; 1172 1173 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1174 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1175 ip_setsockopt); 1176 1177 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1178 #ifdef CONFIG_NETFILTER 1179 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1180 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1181 optname != IP_IPSEC_POLICY && 1182 optname != IP_XFRM_POLICY && 1183 !ip_mroute_opt(optname)) { 1184 lock_sock(sk); 1185 err = compat_nf_setsockopt(sk, PF_INET, optname, 1186 optval, optlen); 1187 release_sock(sk); 1188 } 1189 #endif 1190 return err; 1191 } 1192 EXPORT_SYMBOL(compat_ip_setsockopt); 1193 #endif 1194 1195 /* 1196 * Get the options. Note for future reference. The GET of IP options gets 1197 * the _received_ ones. The set sets the _sent_ ones. 1198 */ 1199 1200 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1201 char __user *optval, int __user *optlen, unsigned int flags) 1202 { 1203 struct inet_sock *inet = inet_sk(sk); 1204 int val; 1205 int len; 1206 1207 if (level != SOL_IP) 1208 return -EOPNOTSUPP; 1209 1210 if (ip_mroute_opt(optname)) 1211 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1212 1213 if (get_user(len, optlen)) 1214 return -EFAULT; 1215 if (len < 0) 1216 return -EINVAL; 1217 1218 lock_sock(sk); 1219 1220 switch (optname) { 1221 case IP_OPTIONS: 1222 { 1223 unsigned char optbuf[sizeof(struct ip_options)+40]; 1224 struct ip_options *opt = (struct ip_options *)optbuf; 1225 struct ip_options_rcu *inet_opt; 1226 1227 inet_opt = rcu_dereference_protected(inet->inet_opt, 1228 sock_owned_by_user(sk)); 1229 opt->optlen = 0; 1230 if (inet_opt) 1231 memcpy(optbuf, &inet_opt->opt, 1232 sizeof(struct ip_options) + 1233 inet_opt->opt.optlen); 1234 release_sock(sk); 1235 1236 if (opt->optlen == 0) 1237 return put_user(0, optlen); 1238 1239 ip_options_undo(opt); 1240 1241 len = min_t(unsigned int, len, opt->optlen); 1242 if (put_user(len, optlen)) 1243 return -EFAULT; 1244 if (copy_to_user(optval, opt->__data, len)) 1245 return -EFAULT; 1246 return 0; 1247 } 1248 case IP_PKTINFO: 1249 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1250 break; 1251 case IP_RECVTTL: 1252 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1253 break; 1254 case IP_RECVTOS: 1255 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1256 break; 1257 case IP_RECVOPTS: 1258 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1259 break; 1260 case IP_RETOPTS: 1261 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1262 break; 1263 case IP_PASSSEC: 1264 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1265 break; 1266 case IP_RECVORIGDSTADDR: 1267 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1268 break; 1269 case IP_CHECKSUM: 1270 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1271 break; 1272 case IP_TOS: 1273 val = inet->tos; 1274 break; 1275 case IP_TTL: 1276 val = (inet->uc_ttl == -1 ? 1277 sysctl_ip_default_ttl : 1278 inet->uc_ttl); 1279 break; 1280 case IP_HDRINCL: 1281 val = inet->hdrincl; 1282 break; 1283 case IP_NODEFRAG: 1284 val = inet->nodefrag; 1285 break; 1286 case IP_MTU_DISCOVER: 1287 val = inet->pmtudisc; 1288 break; 1289 case IP_MTU: 1290 { 1291 struct dst_entry *dst; 1292 val = 0; 1293 dst = sk_dst_get(sk); 1294 if (dst) { 1295 val = dst_mtu(dst); 1296 dst_release(dst); 1297 } 1298 if (!val) { 1299 release_sock(sk); 1300 return -ENOTCONN; 1301 } 1302 break; 1303 } 1304 case IP_RECVERR: 1305 val = inet->recverr; 1306 break; 1307 case IP_MULTICAST_TTL: 1308 val = inet->mc_ttl; 1309 break; 1310 case IP_MULTICAST_LOOP: 1311 val = inet->mc_loop; 1312 break; 1313 case IP_UNICAST_IF: 1314 val = (__force int)htonl((__u32) inet->uc_index); 1315 break; 1316 case IP_MULTICAST_IF: 1317 { 1318 struct in_addr addr; 1319 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1320 addr.s_addr = inet->mc_addr; 1321 release_sock(sk); 1322 1323 if (put_user(len, optlen)) 1324 return -EFAULT; 1325 if (copy_to_user(optval, &addr, len)) 1326 return -EFAULT; 1327 return 0; 1328 } 1329 case IP_MSFILTER: 1330 { 1331 struct ip_msfilter msf; 1332 int err; 1333 1334 if (len < IP_MSFILTER_SIZE(0)) { 1335 release_sock(sk); 1336 return -EINVAL; 1337 } 1338 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1339 release_sock(sk); 1340 return -EFAULT; 1341 } 1342 err = ip_mc_msfget(sk, &msf, 1343 (struct ip_msfilter __user *)optval, optlen); 1344 release_sock(sk); 1345 return err; 1346 } 1347 case MCAST_MSFILTER: 1348 { 1349 struct group_filter gsf; 1350 int err; 1351 1352 if (len < GROUP_FILTER_SIZE(0)) { 1353 release_sock(sk); 1354 return -EINVAL; 1355 } 1356 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1357 release_sock(sk); 1358 return -EFAULT; 1359 } 1360 err = ip_mc_gsfget(sk, &gsf, 1361 (struct group_filter __user *)optval, 1362 optlen); 1363 release_sock(sk); 1364 return err; 1365 } 1366 case IP_MULTICAST_ALL: 1367 val = inet->mc_all; 1368 break; 1369 case IP_PKTOPTIONS: 1370 { 1371 struct msghdr msg; 1372 1373 release_sock(sk); 1374 1375 if (sk->sk_type != SOCK_STREAM) 1376 return -ENOPROTOOPT; 1377 1378 msg.msg_control = (__force void *) optval; 1379 msg.msg_controllen = len; 1380 msg.msg_flags = flags; 1381 1382 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1383 struct in_pktinfo info; 1384 1385 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1386 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1387 info.ipi_ifindex = inet->mc_index; 1388 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1389 } 1390 if (inet->cmsg_flags & IP_CMSG_TTL) { 1391 int hlim = inet->mc_ttl; 1392 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1393 } 1394 if (inet->cmsg_flags & IP_CMSG_TOS) { 1395 int tos = inet->rcv_tos; 1396 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1397 } 1398 len -= msg.msg_controllen; 1399 return put_user(len, optlen); 1400 } 1401 case IP_FREEBIND: 1402 val = inet->freebind; 1403 break; 1404 case IP_TRANSPARENT: 1405 val = inet->transparent; 1406 break; 1407 case IP_MINTTL: 1408 val = inet->min_ttl; 1409 break; 1410 default: 1411 release_sock(sk); 1412 return -ENOPROTOOPT; 1413 } 1414 release_sock(sk); 1415 1416 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1417 unsigned char ucval = (unsigned char)val; 1418 len = 1; 1419 if (put_user(len, optlen)) 1420 return -EFAULT; 1421 if (copy_to_user(optval, &ucval, 1)) 1422 return -EFAULT; 1423 } else { 1424 len = min_t(unsigned int, sizeof(int), len); 1425 if (put_user(len, optlen)) 1426 return -EFAULT; 1427 if (copy_to_user(optval, &val, len)) 1428 return -EFAULT; 1429 } 1430 return 0; 1431 } 1432 1433 int ip_getsockopt(struct sock *sk, int level, 1434 int optname, char __user *optval, int __user *optlen) 1435 { 1436 int err; 1437 1438 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1439 #ifdef CONFIG_NETFILTER 1440 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1441 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1442 !ip_mroute_opt(optname)) { 1443 int len; 1444 1445 if (get_user(len, optlen)) 1446 return -EFAULT; 1447 1448 lock_sock(sk); 1449 err = nf_getsockopt(sk, PF_INET, optname, optval, 1450 &len); 1451 release_sock(sk); 1452 if (err >= 0) 1453 err = put_user(len, optlen); 1454 return err; 1455 } 1456 #endif 1457 return err; 1458 } 1459 EXPORT_SYMBOL(ip_getsockopt); 1460 1461 #ifdef CONFIG_COMPAT 1462 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1463 char __user *optval, int __user *optlen) 1464 { 1465 int err; 1466 1467 if (optname == MCAST_MSFILTER) 1468 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1469 ip_getsockopt); 1470 1471 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1472 MSG_CMSG_COMPAT); 1473 1474 #ifdef CONFIG_NETFILTER 1475 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1476 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1477 !ip_mroute_opt(optname)) { 1478 int len; 1479 1480 if (get_user(len, optlen)) 1481 return -EFAULT; 1482 1483 lock_sock(sk); 1484 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1485 release_sock(sk); 1486 if (err >= 0) 1487 err = put_user(len, optlen); 1488 return err; 1489 } 1490 #endif 1491 return err; 1492 } 1493 EXPORT_SYMBOL(compat_ip_getsockopt); 1494 #endif 1495