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 #if IS_ENABLED(CONFIG_IPV6) 41 #include <net/transp_v6.h> 42 #endif 43 #include <net/ip_fib.h> 44 45 #include <linux/errqueue.h> 46 #include <asm/uaccess.h> 47 48 #define IP_CMSG_PKTINFO 1 49 #define IP_CMSG_TTL 2 50 #define IP_CMSG_TOS 4 51 #define IP_CMSG_RECVOPTS 8 52 #define IP_CMSG_RETOPTS 16 53 #define IP_CMSG_PASSSEC 32 54 #define IP_CMSG_ORIGDSTADDR 64 55 56 /* 57 * SOL_IP control messages. 58 */ 59 60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 61 { 62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 63 64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 65 66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 67 } 68 69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 70 { 71 int ttl = ip_hdr(skb)->ttl; 72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 73 } 74 75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 76 { 77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 78 } 79 80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 81 { 82 if (IPCB(skb)->opt.optlen == 0) 83 return; 84 85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 86 ip_hdr(skb) + 1); 87 } 88 89 90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb) 91 { 92 unsigned char optbuf[sizeof(struct ip_options) + 40]; 93 struct ip_options *opt = (struct ip_options *)optbuf; 94 95 if (IPCB(skb)->opt.optlen == 0) 96 return; 97 98 if (ip_options_echo(opt, skb)) { 99 msg->msg_flags |= MSG_CTRUNC; 100 return; 101 } 102 ip_options_undo(opt); 103 104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 105 } 106 107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 108 { 109 char *secdata; 110 u32 seclen, secid; 111 int err; 112 113 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 114 if (err) 115 return; 116 117 err = security_secid_to_secctx(secid, &secdata, &seclen); 118 if (err) 119 return; 120 121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 122 security_release_secctx(secdata, seclen); 123 } 124 125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 126 { 127 struct sockaddr_in sin; 128 const struct iphdr *iph = ip_hdr(skb); 129 __be16 *ports = (__be16 *)skb_transport_header(skb); 130 131 if (skb_transport_offset(skb) + 4 > skb->len) 132 return; 133 134 /* All current transport protocols have the port numbers in the 135 * first four bytes of the transport header and this function is 136 * written with this assumption in mind. 137 */ 138 139 sin.sin_family = AF_INET; 140 sin.sin_addr.s_addr = iph->daddr; 141 sin.sin_port = ports[1]; 142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 143 144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 145 } 146 147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 148 { 149 struct inet_sock *inet = inet_sk(skb->sk); 150 unsigned int flags = inet->cmsg_flags; 151 152 /* Ordered by supposed usage frequency */ 153 if (flags & 1) 154 ip_cmsg_recv_pktinfo(msg, skb); 155 if ((flags >>= 1) == 0) 156 return; 157 158 if (flags & 1) 159 ip_cmsg_recv_ttl(msg, skb); 160 if ((flags >>= 1) == 0) 161 return; 162 163 if (flags & 1) 164 ip_cmsg_recv_tos(msg, skb); 165 if ((flags >>= 1) == 0) 166 return; 167 168 if (flags & 1) 169 ip_cmsg_recv_opts(msg, skb); 170 if ((flags >>= 1) == 0) 171 return; 172 173 if (flags & 1) 174 ip_cmsg_recv_retopts(msg, skb); 175 if ((flags >>= 1) == 0) 176 return; 177 178 if (flags & 1) 179 ip_cmsg_recv_security(msg, skb); 180 181 if ((flags >>= 1) == 0) 182 return; 183 if (flags & 1) 184 ip_cmsg_recv_dstaddr(msg, skb); 185 186 } 187 EXPORT_SYMBOL(ip_cmsg_recv); 188 189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, 190 bool allow_ipv6) 191 { 192 int err, val; 193 struct cmsghdr *cmsg; 194 195 for_each_cmsghdr(cmsg, msg) { 196 if (!CMSG_OK(msg, cmsg)) 197 return -EINVAL; 198 #if IS_ENABLED(CONFIG_IPV6) 199 if (allow_ipv6 && 200 cmsg->cmsg_level == SOL_IPV6 && 201 cmsg->cmsg_type == IPV6_PKTINFO) { 202 struct in6_pktinfo *src_info; 203 204 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 205 return -EINVAL; 206 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 207 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 208 return -EINVAL; 209 ipc->oif = src_info->ipi6_ifindex; 210 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 211 continue; 212 } 213 #endif 214 if (cmsg->cmsg_level != SOL_IP) 215 continue; 216 switch (cmsg->cmsg_type) { 217 case IP_RETOPTS: 218 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); 219 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 220 err < 40 ? err : 40); 221 if (err) 222 return err; 223 break; 224 case IP_PKTINFO: 225 { 226 struct in_pktinfo *info; 227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 228 return -EINVAL; 229 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 230 ipc->oif = info->ipi_ifindex; 231 ipc->addr = info->ipi_spec_dst.s_addr; 232 break; 233 } 234 case IP_TTL: 235 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 236 return -EINVAL; 237 val = *(int *)CMSG_DATA(cmsg); 238 if (val < 1 || val > 255) 239 return -EINVAL; 240 ipc->ttl = val; 241 break; 242 case IP_TOS: 243 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 244 return -EINVAL; 245 val = *(int *)CMSG_DATA(cmsg); 246 if (val < 0 || val > 255) 247 return -EINVAL; 248 ipc->tos = val; 249 ipc->priority = rt_tos2priority(ipc->tos); 250 break; 251 252 default: 253 return -EINVAL; 254 } 255 } 256 return 0; 257 } 258 259 260 /* Special input handler for packets caught by router alert option. 261 They are selected only by protocol field, and then processed likely 262 local ones; but only if someone wants them! Otherwise, router 263 not running rsvpd will kill RSVP. 264 265 It is user level problem, what it will make with them. 266 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), 267 but receiver should be enough clever f.e. to forward mtrace requests, 268 sent to multicast group to reach destination designated router. 269 */ 270 struct ip_ra_chain __rcu *ip_ra_chain; 271 static DEFINE_SPINLOCK(ip_ra_lock); 272 273 274 static void ip_ra_destroy_rcu(struct rcu_head *head) 275 { 276 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 277 278 sock_put(ra->saved_sk); 279 kfree(ra); 280 } 281 282 int ip_ra_control(struct sock *sk, unsigned char on, 283 void (*destructor)(struct sock *)) 284 { 285 struct ip_ra_chain *ra, *new_ra; 286 struct ip_ra_chain __rcu **rap; 287 288 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 289 return -EINVAL; 290 291 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 292 293 spin_lock_bh(&ip_ra_lock); 294 for (rap = &ip_ra_chain; 295 (ra = rcu_dereference_protected(*rap, 296 lockdep_is_held(&ip_ra_lock))) != NULL; 297 rap = &ra->next) { 298 if (ra->sk == sk) { 299 if (on) { 300 spin_unlock_bh(&ip_ra_lock); 301 kfree(new_ra); 302 return -EADDRINUSE; 303 } 304 /* dont let ip_call_ra_chain() use sk again */ 305 ra->sk = NULL; 306 RCU_INIT_POINTER(*rap, ra->next); 307 spin_unlock_bh(&ip_ra_lock); 308 309 if (ra->destructor) 310 ra->destructor(sk); 311 /* 312 * Delay sock_put(sk) and kfree(ra) after one rcu grace 313 * period. This guarantee ip_call_ra_chain() dont need 314 * to mess with socket refcounts. 315 */ 316 ra->saved_sk = sk; 317 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 318 return 0; 319 } 320 } 321 if (new_ra == NULL) { 322 spin_unlock_bh(&ip_ra_lock); 323 return -ENOBUFS; 324 } 325 new_ra->sk = sk; 326 new_ra->destructor = destructor; 327 328 RCU_INIT_POINTER(new_ra->next, ra); 329 rcu_assign_pointer(*rap, new_ra); 330 sock_hold(sk); 331 spin_unlock_bh(&ip_ra_lock); 332 333 return 0; 334 } 335 336 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 337 __be16 port, u32 info, u8 *payload) 338 { 339 struct sock_exterr_skb *serr; 340 341 skb = skb_clone(skb, GFP_ATOMIC); 342 if (!skb) 343 return; 344 345 serr = SKB_EXT_ERR(skb); 346 serr->ee.ee_errno = err; 347 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 348 serr->ee.ee_type = icmp_hdr(skb)->type; 349 serr->ee.ee_code = icmp_hdr(skb)->code; 350 serr->ee.ee_pad = 0; 351 serr->ee.ee_info = info; 352 serr->ee.ee_data = 0; 353 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 354 skb_network_header(skb); 355 serr->port = port; 356 357 if (skb_pull(skb, payload - skb->data) != NULL) { 358 skb_reset_transport_header(skb); 359 if (sock_queue_err_skb(sk, skb) == 0) 360 return; 361 } 362 kfree_skb(skb); 363 } 364 365 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 366 { 367 struct inet_sock *inet = inet_sk(sk); 368 struct sock_exterr_skb *serr; 369 struct iphdr *iph; 370 struct sk_buff *skb; 371 372 if (!inet->recverr) 373 return; 374 375 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 376 if (!skb) 377 return; 378 379 skb_put(skb, sizeof(struct iphdr)); 380 skb_reset_network_header(skb); 381 iph = ip_hdr(skb); 382 iph->daddr = daddr; 383 384 serr = SKB_EXT_ERR(skb); 385 serr->ee.ee_errno = err; 386 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 387 serr->ee.ee_type = 0; 388 serr->ee.ee_code = 0; 389 serr->ee.ee_pad = 0; 390 serr->ee.ee_info = info; 391 serr->ee.ee_data = 0; 392 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 393 serr->port = port; 394 395 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 396 skb_reset_transport_header(skb); 397 398 if (sock_queue_err_skb(sk, skb)) 399 kfree_skb(skb); 400 } 401 402 static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk, 403 const struct sk_buff *skb, 404 int ee_origin) 405 { 406 struct in_pktinfo *info = PKTINFO_SKB_CB(skb); 407 408 if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) || 409 (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) || 410 (!skb->dev)) 411 return false; 412 413 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 414 info->ipi_ifindex = skb->dev->ifindex; 415 return true; 416 } 417 418 /* 419 * Handle MSG_ERRQUEUE 420 */ 421 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 422 { 423 struct sock_exterr_skb *serr; 424 struct sk_buff *skb; 425 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 426 struct { 427 struct sock_extended_err ee; 428 struct sockaddr_in offender; 429 } errhdr; 430 int err; 431 int copied; 432 433 WARN_ON_ONCE(sk->sk_family == AF_INET6); 434 435 err = -EAGAIN; 436 skb = sock_dequeue_err_skb(sk); 437 if (skb == NULL) 438 goto out; 439 440 copied = skb->len; 441 if (copied > len) { 442 msg->msg_flags |= MSG_TRUNC; 443 copied = len; 444 } 445 err = skb_copy_datagram_msg(skb, 0, msg, copied); 446 if (err) 447 goto out_free_skb; 448 449 sock_recv_timestamp(msg, sk, skb); 450 451 serr = SKB_EXT_ERR(skb); 452 453 if (sin) { 454 sin->sin_family = AF_INET; 455 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 456 serr->addr_offset); 457 sin->sin_port = serr->port; 458 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 459 *addr_len = sizeof(*sin); 460 } 461 462 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 463 sin = &errhdr.offender; 464 memset(sin, 0, sizeof(*sin)); 465 466 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 467 ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) { 468 sin->sin_family = AF_INET; 469 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 470 if (inet_sk(sk)->cmsg_flags) 471 ip_cmsg_recv(msg, skb); 472 } 473 474 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 475 476 /* Now we could try to dump offended packet options */ 477 478 msg->msg_flags |= MSG_ERRQUEUE; 479 err = copied; 480 481 out_free_skb: 482 kfree_skb(skb); 483 out: 484 return err; 485 } 486 487 488 /* 489 * Socket option code for IP. This is the end of the line after any 490 * TCP,UDP etc options on an IP socket. 491 */ 492 493 static int do_ip_setsockopt(struct sock *sk, int level, 494 int optname, char __user *optval, unsigned int optlen) 495 { 496 struct inet_sock *inet = inet_sk(sk); 497 int val = 0, err; 498 499 switch (optname) { 500 case IP_PKTINFO: 501 case IP_RECVTTL: 502 case IP_RECVOPTS: 503 case IP_RECVTOS: 504 case IP_RETOPTS: 505 case IP_TOS: 506 case IP_TTL: 507 case IP_HDRINCL: 508 case IP_MTU_DISCOVER: 509 case IP_RECVERR: 510 case IP_ROUTER_ALERT: 511 case IP_FREEBIND: 512 case IP_PASSSEC: 513 case IP_TRANSPARENT: 514 case IP_MINTTL: 515 case IP_NODEFRAG: 516 case IP_UNICAST_IF: 517 case IP_MULTICAST_TTL: 518 case IP_MULTICAST_ALL: 519 case IP_MULTICAST_LOOP: 520 case IP_RECVORIGDSTADDR: 521 if (optlen >= sizeof(int)) { 522 if (get_user(val, (int __user *) optval)) 523 return -EFAULT; 524 } else if (optlen >= sizeof(char)) { 525 unsigned char ucval; 526 527 if (get_user(ucval, (unsigned char __user *) optval)) 528 return -EFAULT; 529 val = (int) ucval; 530 } 531 } 532 533 /* If optlen==0, it is equivalent to val == 0 */ 534 535 if (ip_mroute_opt(optname)) 536 return ip_mroute_setsockopt(sk, optname, optval, optlen); 537 538 err = 0; 539 lock_sock(sk); 540 541 switch (optname) { 542 case IP_OPTIONS: 543 { 544 struct ip_options_rcu *old, *opt = NULL; 545 546 if (optlen > 40) 547 goto e_inval; 548 err = ip_options_get_from_user(sock_net(sk), &opt, 549 optval, optlen); 550 if (err) 551 break; 552 old = rcu_dereference_protected(inet->inet_opt, 553 sock_owned_by_user(sk)); 554 if (inet->is_icsk) { 555 struct inet_connection_sock *icsk = inet_csk(sk); 556 #if IS_ENABLED(CONFIG_IPV6) 557 if (sk->sk_family == PF_INET || 558 (!((1 << sk->sk_state) & 559 (TCPF_LISTEN | TCPF_CLOSE)) && 560 inet->inet_daddr != LOOPBACK4_IPV6)) { 561 #endif 562 if (old) 563 icsk->icsk_ext_hdr_len -= old->opt.optlen; 564 if (opt) 565 icsk->icsk_ext_hdr_len += opt->opt.optlen; 566 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 567 #if IS_ENABLED(CONFIG_IPV6) 568 } 569 #endif 570 } 571 rcu_assign_pointer(inet->inet_opt, opt); 572 if (old) 573 kfree_rcu(old, rcu); 574 break; 575 } 576 case IP_PKTINFO: 577 if (val) 578 inet->cmsg_flags |= IP_CMSG_PKTINFO; 579 else 580 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 581 break; 582 case IP_RECVTTL: 583 if (val) 584 inet->cmsg_flags |= IP_CMSG_TTL; 585 else 586 inet->cmsg_flags &= ~IP_CMSG_TTL; 587 break; 588 case IP_RECVTOS: 589 if (val) 590 inet->cmsg_flags |= IP_CMSG_TOS; 591 else 592 inet->cmsg_flags &= ~IP_CMSG_TOS; 593 break; 594 case IP_RECVOPTS: 595 if (val) 596 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 597 else 598 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 599 break; 600 case IP_RETOPTS: 601 if (val) 602 inet->cmsg_flags |= IP_CMSG_RETOPTS; 603 else 604 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 605 break; 606 case IP_PASSSEC: 607 if (val) 608 inet->cmsg_flags |= IP_CMSG_PASSSEC; 609 else 610 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 611 break; 612 case IP_RECVORIGDSTADDR: 613 if (val) 614 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 615 else 616 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 617 break; 618 case IP_TOS: /* This sets both TOS and Precedence */ 619 if (sk->sk_type == SOCK_STREAM) { 620 val &= ~INET_ECN_MASK; 621 val |= inet->tos & INET_ECN_MASK; 622 } 623 if (inet->tos != val) { 624 inet->tos = val; 625 sk->sk_priority = rt_tos2priority(val); 626 sk_dst_reset(sk); 627 } 628 break; 629 case IP_TTL: 630 if (optlen < 1) 631 goto e_inval; 632 if (val != -1 && (val < 1 || val > 255)) 633 goto e_inval; 634 inet->uc_ttl = val; 635 break; 636 case IP_HDRINCL: 637 if (sk->sk_type != SOCK_RAW) { 638 err = -ENOPROTOOPT; 639 break; 640 } 641 inet->hdrincl = val ? 1 : 0; 642 break; 643 case IP_NODEFRAG: 644 if (sk->sk_type != SOCK_RAW) { 645 err = -ENOPROTOOPT; 646 break; 647 } 648 inet->nodefrag = val ? 1 : 0; 649 break; 650 case IP_MTU_DISCOVER: 651 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 652 goto e_inval; 653 inet->pmtudisc = val; 654 break; 655 case IP_RECVERR: 656 inet->recverr = !!val; 657 if (!val) 658 skb_queue_purge(&sk->sk_error_queue); 659 break; 660 case IP_MULTICAST_TTL: 661 if (sk->sk_type == SOCK_STREAM) 662 goto e_inval; 663 if (optlen < 1) 664 goto e_inval; 665 if (val == -1) 666 val = 1; 667 if (val < 0 || val > 255) 668 goto e_inval; 669 inet->mc_ttl = val; 670 break; 671 case IP_MULTICAST_LOOP: 672 if (optlen < 1) 673 goto e_inval; 674 inet->mc_loop = !!val; 675 break; 676 case IP_UNICAST_IF: 677 { 678 struct net_device *dev = NULL; 679 int ifindex; 680 681 if (optlen != sizeof(int)) 682 goto e_inval; 683 684 ifindex = (__force int)ntohl((__force __be32)val); 685 if (ifindex == 0) { 686 inet->uc_index = 0; 687 err = 0; 688 break; 689 } 690 691 dev = dev_get_by_index(sock_net(sk), ifindex); 692 err = -EADDRNOTAVAIL; 693 if (!dev) 694 break; 695 dev_put(dev); 696 697 err = -EINVAL; 698 if (sk->sk_bound_dev_if) 699 break; 700 701 inet->uc_index = ifindex; 702 err = 0; 703 break; 704 } 705 case IP_MULTICAST_IF: 706 { 707 struct ip_mreqn mreq; 708 struct net_device *dev = NULL; 709 710 if (sk->sk_type == SOCK_STREAM) 711 goto e_inval; 712 /* 713 * Check the arguments are allowable 714 */ 715 716 if (optlen < sizeof(struct in_addr)) 717 goto e_inval; 718 719 err = -EFAULT; 720 if (optlen >= sizeof(struct ip_mreqn)) { 721 if (copy_from_user(&mreq, optval, sizeof(mreq))) 722 break; 723 } else { 724 memset(&mreq, 0, sizeof(mreq)); 725 if (optlen >= sizeof(struct ip_mreq)) { 726 if (copy_from_user(&mreq, optval, 727 sizeof(struct ip_mreq))) 728 break; 729 } else if (optlen >= sizeof(struct in_addr)) { 730 if (copy_from_user(&mreq.imr_address, optval, 731 sizeof(struct in_addr))) 732 break; 733 } 734 } 735 736 if (!mreq.imr_ifindex) { 737 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 738 inet->mc_index = 0; 739 inet->mc_addr = 0; 740 err = 0; 741 break; 742 } 743 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 744 if (dev) 745 mreq.imr_ifindex = dev->ifindex; 746 } else 747 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 748 749 750 err = -EADDRNOTAVAIL; 751 if (!dev) 752 break; 753 dev_put(dev); 754 755 err = -EINVAL; 756 if (sk->sk_bound_dev_if && 757 mreq.imr_ifindex != sk->sk_bound_dev_if) 758 break; 759 760 inet->mc_index = mreq.imr_ifindex; 761 inet->mc_addr = mreq.imr_address.s_addr; 762 err = 0; 763 break; 764 } 765 766 case IP_ADD_MEMBERSHIP: 767 case IP_DROP_MEMBERSHIP: 768 { 769 struct ip_mreqn mreq; 770 771 err = -EPROTO; 772 if (inet_sk(sk)->is_icsk) 773 break; 774 775 if (optlen < sizeof(struct ip_mreq)) 776 goto e_inval; 777 err = -EFAULT; 778 if (optlen >= sizeof(struct ip_mreqn)) { 779 if (copy_from_user(&mreq, optval, sizeof(mreq))) 780 break; 781 } else { 782 memset(&mreq, 0, sizeof(mreq)); 783 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 784 break; 785 } 786 787 if (optname == IP_ADD_MEMBERSHIP) 788 err = ip_mc_join_group(sk, &mreq); 789 else 790 err = ip_mc_leave_group(sk, &mreq); 791 break; 792 } 793 case IP_MSFILTER: 794 { 795 struct ip_msfilter *msf; 796 797 if (optlen < IP_MSFILTER_SIZE(0)) 798 goto e_inval; 799 if (optlen > sysctl_optmem_max) { 800 err = -ENOBUFS; 801 break; 802 } 803 msf = kmalloc(optlen, GFP_KERNEL); 804 if (!msf) { 805 err = -ENOBUFS; 806 break; 807 } 808 err = -EFAULT; 809 if (copy_from_user(msf, optval, optlen)) { 810 kfree(msf); 811 break; 812 } 813 /* numsrc >= (1G-4) overflow in 32 bits */ 814 if (msf->imsf_numsrc >= 0x3ffffffcU || 815 msf->imsf_numsrc > sysctl_igmp_max_msf) { 816 kfree(msf); 817 err = -ENOBUFS; 818 break; 819 } 820 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 821 kfree(msf); 822 err = -EINVAL; 823 break; 824 } 825 err = ip_mc_msfilter(sk, msf, 0); 826 kfree(msf); 827 break; 828 } 829 case IP_BLOCK_SOURCE: 830 case IP_UNBLOCK_SOURCE: 831 case IP_ADD_SOURCE_MEMBERSHIP: 832 case IP_DROP_SOURCE_MEMBERSHIP: 833 { 834 struct ip_mreq_source mreqs; 835 int omode, add; 836 837 if (optlen != sizeof(struct ip_mreq_source)) 838 goto e_inval; 839 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 840 err = -EFAULT; 841 break; 842 } 843 if (optname == IP_BLOCK_SOURCE) { 844 omode = MCAST_EXCLUDE; 845 add = 1; 846 } else if (optname == IP_UNBLOCK_SOURCE) { 847 omode = MCAST_EXCLUDE; 848 add = 0; 849 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 850 struct ip_mreqn mreq; 851 852 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 853 mreq.imr_address.s_addr = mreqs.imr_interface; 854 mreq.imr_ifindex = 0; 855 err = ip_mc_join_group(sk, &mreq); 856 if (err && err != -EADDRINUSE) 857 break; 858 omode = MCAST_INCLUDE; 859 add = 1; 860 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 861 omode = MCAST_INCLUDE; 862 add = 0; 863 } 864 err = ip_mc_source(add, omode, sk, &mreqs, 0); 865 break; 866 } 867 case MCAST_JOIN_GROUP: 868 case MCAST_LEAVE_GROUP: 869 { 870 struct group_req greq; 871 struct sockaddr_in *psin; 872 struct ip_mreqn mreq; 873 874 if (optlen < sizeof(struct group_req)) 875 goto e_inval; 876 err = -EFAULT; 877 if (copy_from_user(&greq, optval, sizeof(greq))) 878 break; 879 psin = (struct sockaddr_in *)&greq.gr_group; 880 if (psin->sin_family != AF_INET) 881 goto e_inval; 882 memset(&mreq, 0, sizeof(mreq)); 883 mreq.imr_multiaddr = psin->sin_addr; 884 mreq.imr_ifindex = greq.gr_interface; 885 886 if (optname == MCAST_JOIN_GROUP) 887 err = ip_mc_join_group(sk, &mreq); 888 else 889 err = ip_mc_leave_group(sk, &mreq); 890 break; 891 } 892 case MCAST_JOIN_SOURCE_GROUP: 893 case MCAST_LEAVE_SOURCE_GROUP: 894 case MCAST_BLOCK_SOURCE: 895 case MCAST_UNBLOCK_SOURCE: 896 { 897 struct group_source_req greqs; 898 struct ip_mreq_source mreqs; 899 struct sockaddr_in *psin; 900 int omode, add; 901 902 if (optlen != sizeof(struct group_source_req)) 903 goto e_inval; 904 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 905 err = -EFAULT; 906 break; 907 } 908 if (greqs.gsr_group.ss_family != AF_INET || 909 greqs.gsr_source.ss_family != AF_INET) { 910 err = -EADDRNOTAVAIL; 911 break; 912 } 913 psin = (struct sockaddr_in *)&greqs.gsr_group; 914 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 915 psin = (struct sockaddr_in *)&greqs.gsr_source; 916 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 917 mreqs.imr_interface = 0; /* use index for mc_source */ 918 919 if (optname == MCAST_BLOCK_SOURCE) { 920 omode = MCAST_EXCLUDE; 921 add = 1; 922 } else if (optname == MCAST_UNBLOCK_SOURCE) { 923 omode = MCAST_EXCLUDE; 924 add = 0; 925 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 926 struct ip_mreqn mreq; 927 928 psin = (struct sockaddr_in *)&greqs.gsr_group; 929 mreq.imr_multiaddr = psin->sin_addr; 930 mreq.imr_address.s_addr = 0; 931 mreq.imr_ifindex = greqs.gsr_interface; 932 err = ip_mc_join_group(sk, &mreq); 933 if (err && err != -EADDRINUSE) 934 break; 935 greqs.gsr_interface = mreq.imr_ifindex; 936 omode = MCAST_INCLUDE; 937 add = 1; 938 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 939 omode = MCAST_INCLUDE; 940 add = 0; 941 } 942 err = ip_mc_source(add, omode, sk, &mreqs, 943 greqs.gsr_interface); 944 break; 945 } 946 case MCAST_MSFILTER: 947 { 948 struct sockaddr_in *psin; 949 struct ip_msfilter *msf = NULL; 950 struct group_filter *gsf = NULL; 951 int msize, i, ifindex; 952 953 if (optlen < GROUP_FILTER_SIZE(0)) 954 goto e_inval; 955 if (optlen > sysctl_optmem_max) { 956 err = -ENOBUFS; 957 break; 958 } 959 gsf = kmalloc(optlen, GFP_KERNEL); 960 if (!gsf) { 961 err = -ENOBUFS; 962 break; 963 } 964 err = -EFAULT; 965 if (copy_from_user(gsf, optval, optlen)) 966 goto mc_msf_out; 967 968 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 969 if (gsf->gf_numsrc >= 0x1ffffff || 970 gsf->gf_numsrc > sysctl_igmp_max_msf) { 971 err = -ENOBUFS; 972 goto mc_msf_out; 973 } 974 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 975 err = -EINVAL; 976 goto mc_msf_out; 977 } 978 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 979 msf = kmalloc(msize, GFP_KERNEL); 980 if (!msf) { 981 err = -ENOBUFS; 982 goto mc_msf_out; 983 } 984 ifindex = gsf->gf_interface; 985 psin = (struct sockaddr_in *)&gsf->gf_group; 986 if (psin->sin_family != AF_INET) { 987 err = -EADDRNOTAVAIL; 988 goto mc_msf_out; 989 } 990 msf->imsf_multiaddr = psin->sin_addr.s_addr; 991 msf->imsf_interface = 0; 992 msf->imsf_fmode = gsf->gf_fmode; 993 msf->imsf_numsrc = gsf->gf_numsrc; 994 err = -EADDRNOTAVAIL; 995 for (i = 0; i < gsf->gf_numsrc; ++i) { 996 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 997 998 if (psin->sin_family != AF_INET) 999 goto mc_msf_out; 1000 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1001 } 1002 kfree(gsf); 1003 gsf = NULL; 1004 1005 err = ip_mc_msfilter(sk, msf, ifindex); 1006 mc_msf_out: 1007 kfree(msf); 1008 kfree(gsf); 1009 break; 1010 } 1011 case IP_MULTICAST_ALL: 1012 if (optlen < 1) 1013 goto e_inval; 1014 if (val != 0 && val != 1) 1015 goto e_inval; 1016 inet->mc_all = val; 1017 break; 1018 case IP_ROUTER_ALERT: 1019 err = ip_ra_control(sk, val ? 1 : 0, NULL); 1020 break; 1021 1022 case IP_FREEBIND: 1023 if (optlen < 1) 1024 goto e_inval; 1025 inet->freebind = !!val; 1026 break; 1027 1028 case IP_IPSEC_POLICY: 1029 case IP_XFRM_POLICY: 1030 err = -EPERM; 1031 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1032 break; 1033 err = xfrm_user_policy(sk, optname, optval, optlen); 1034 break; 1035 1036 case IP_TRANSPARENT: 1037 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1038 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1039 err = -EPERM; 1040 break; 1041 } 1042 if (optlen < 1) 1043 goto e_inval; 1044 inet->transparent = !!val; 1045 break; 1046 1047 case IP_MINTTL: 1048 if (optlen < 1) 1049 goto e_inval; 1050 if (val < 0 || val > 255) 1051 goto e_inval; 1052 inet->min_ttl = val; 1053 break; 1054 1055 default: 1056 err = -ENOPROTOOPT; 1057 break; 1058 } 1059 release_sock(sk); 1060 return err; 1061 1062 e_inval: 1063 release_sock(sk); 1064 return -EINVAL; 1065 } 1066 1067 /** 1068 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1069 * @sk: socket 1070 * @skb: buffer 1071 * 1072 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1073 * destination in skb->cb[] before dst drop. 1074 * This way, receiver doesn't make cache line misses to read rtable. 1075 */ 1076 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1077 { 1078 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1079 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1080 ipv6_sk_rxinfo(sk); 1081 1082 if (prepare && skb_rtable(skb)) { 1083 pktinfo->ipi_ifindex = inet_iif(skb); 1084 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1085 } else { 1086 pktinfo->ipi_ifindex = 0; 1087 pktinfo->ipi_spec_dst.s_addr = 0; 1088 } 1089 skb_dst_drop(skb); 1090 } 1091 1092 int ip_setsockopt(struct sock *sk, int level, 1093 int optname, char __user *optval, unsigned int optlen) 1094 { 1095 int err; 1096 1097 if (level != SOL_IP) 1098 return -ENOPROTOOPT; 1099 1100 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1101 #ifdef CONFIG_NETFILTER 1102 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1103 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1104 optname != IP_IPSEC_POLICY && 1105 optname != IP_XFRM_POLICY && 1106 !ip_mroute_opt(optname)) { 1107 lock_sock(sk); 1108 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1109 release_sock(sk); 1110 } 1111 #endif 1112 return err; 1113 } 1114 EXPORT_SYMBOL(ip_setsockopt); 1115 1116 #ifdef CONFIG_COMPAT 1117 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1118 char __user *optval, unsigned int optlen) 1119 { 1120 int err; 1121 1122 if (level != SOL_IP) 1123 return -ENOPROTOOPT; 1124 1125 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1126 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1127 ip_setsockopt); 1128 1129 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1130 #ifdef CONFIG_NETFILTER 1131 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1132 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1133 optname != IP_IPSEC_POLICY && 1134 optname != IP_XFRM_POLICY && 1135 !ip_mroute_opt(optname)) { 1136 lock_sock(sk); 1137 err = compat_nf_setsockopt(sk, PF_INET, optname, 1138 optval, optlen); 1139 release_sock(sk); 1140 } 1141 #endif 1142 return err; 1143 } 1144 EXPORT_SYMBOL(compat_ip_setsockopt); 1145 #endif 1146 1147 /* 1148 * Get the options. Note for future reference. The GET of IP options gets 1149 * the _received_ ones. The set sets the _sent_ ones. 1150 */ 1151 1152 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1153 char __user *optval, int __user *optlen, unsigned int flags) 1154 { 1155 struct inet_sock *inet = inet_sk(sk); 1156 int val; 1157 int len; 1158 1159 if (level != SOL_IP) 1160 return -EOPNOTSUPP; 1161 1162 if (ip_mroute_opt(optname)) 1163 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1164 1165 if (get_user(len, optlen)) 1166 return -EFAULT; 1167 if (len < 0) 1168 return -EINVAL; 1169 1170 lock_sock(sk); 1171 1172 switch (optname) { 1173 case IP_OPTIONS: 1174 { 1175 unsigned char optbuf[sizeof(struct ip_options)+40]; 1176 struct ip_options *opt = (struct ip_options *)optbuf; 1177 struct ip_options_rcu *inet_opt; 1178 1179 inet_opt = rcu_dereference_protected(inet->inet_opt, 1180 sock_owned_by_user(sk)); 1181 opt->optlen = 0; 1182 if (inet_opt) 1183 memcpy(optbuf, &inet_opt->opt, 1184 sizeof(struct ip_options) + 1185 inet_opt->opt.optlen); 1186 release_sock(sk); 1187 1188 if (opt->optlen == 0) 1189 return put_user(0, optlen); 1190 1191 ip_options_undo(opt); 1192 1193 len = min_t(unsigned int, len, opt->optlen); 1194 if (put_user(len, optlen)) 1195 return -EFAULT; 1196 if (copy_to_user(optval, opt->__data, len)) 1197 return -EFAULT; 1198 return 0; 1199 } 1200 case IP_PKTINFO: 1201 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1202 break; 1203 case IP_RECVTTL: 1204 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1205 break; 1206 case IP_RECVTOS: 1207 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1208 break; 1209 case IP_RECVOPTS: 1210 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1211 break; 1212 case IP_RETOPTS: 1213 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1214 break; 1215 case IP_PASSSEC: 1216 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1217 break; 1218 case IP_RECVORIGDSTADDR: 1219 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1220 break; 1221 case IP_TOS: 1222 val = inet->tos; 1223 break; 1224 case IP_TTL: 1225 val = (inet->uc_ttl == -1 ? 1226 sysctl_ip_default_ttl : 1227 inet->uc_ttl); 1228 break; 1229 case IP_HDRINCL: 1230 val = inet->hdrincl; 1231 break; 1232 case IP_NODEFRAG: 1233 val = inet->nodefrag; 1234 break; 1235 case IP_MTU_DISCOVER: 1236 val = inet->pmtudisc; 1237 break; 1238 case IP_MTU: 1239 { 1240 struct dst_entry *dst; 1241 val = 0; 1242 dst = sk_dst_get(sk); 1243 if (dst) { 1244 val = dst_mtu(dst); 1245 dst_release(dst); 1246 } 1247 if (!val) { 1248 release_sock(sk); 1249 return -ENOTCONN; 1250 } 1251 break; 1252 } 1253 case IP_RECVERR: 1254 val = inet->recverr; 1255 break; 1256 case IP_MULTICAST_TTL: 1257 val = inet->mc_ttl; 1258 break; 1259 case IP_MULTICAST_LOOP: 1260 val = inet->mc_loop; 1261 break; 1262 case IP_UNICAST_IF: 1263 val = (__force int)htonl((__u32) inet->uc_index); 1264 break; 1265 case IP_MULTICAST_IF: 1266 { 1267 struct in_addr addr; 1268 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1269 addr.s_addr = inet->mc_addr; 1270 release_sock(sk); 1271 1272 if (put_user(len, optlen)) 1273 return -EFAULT; 1274 if (copy_to_user(optval, &addr, len)) 1275 return -EFAULT; 1276 return 0; 1277 } 1278 case IP_MSFILTER: 1279 { 1280 struct ip_msfilter msf; 1281 int err; 1282 1283 if (len < IP_MSFILTER_SIZE(0)) { 1284 release_sock(sk); 1285 return -EINVAL; 1286 } 1287 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1288 release_sock(sk); 1289 return -EFAULT; 1290 } 1291 err = ip_mc_msfget(sk, &msf, 1292 (struct ip_msfilter __user *)optval, optlen); 1293 release_sock(sk); 1294 return err; 1295 } 1296 case MCAST_MSFILTER: 1297 { 1298 struct group_filter gsf; 1299 int err; 1300 1301 if (len < GROUP_FILTER_SIZE(0)) { 1302 release_sock(sk); 1303 return -EINVAL; 1304 } 1305 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1306 release_sock(sk); 1307 return -EFAULT; 1308 } 1309 err = ip_mc_gsfget(sk, &gsf, 1310 (struct group_filter __user *)optval, 1311 optlen); 1312 release_sock(sk); 1313 return err; 1314 } 1315 case IP_MULTICAST_ALL: 1316 val = inet->mc_all; 1317 break; 1318 case IP_PKTOPTIONS: 1319 { 1320 struct msghdr msg; 1321 1322 release_sock(sk); 1323 1324 if (sk->sk_type != SOCK_STREAM) 1325 return -ENOPROTOOPT; 1326 1327 msg.msg_control = (__force void *) optval; 1328 msg.msg_controllen = len; 1329 msg.msg_flags = flags; 1330 1331 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1332 struct in_pktinfo info; 1333 1334 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1335 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1336 info.ipi_ifindex = inet->mc_index; 1337 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1338 } 1339 if (inet->cmsg_flags & IP_CMSG_TTL) { 1340 int hlim = inet->mc_ttl; 1341 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1342 } 1343 if (inet->cmsg_flags & IP_CMSG_TOS) { 1344 int tos = inet->rcv_tos; 1345 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1346 } 1347 len -= msg.msg_controllen; 1348 return put_user(len, optlen); 1349 } 1350 case IP_FREEBIND: 1351 val = inet->freebind; 1352 break; 1353 case IP_TRANSPARENT: 1354 val = inet->transparent; 1355 break; 1356 case IP_MINTTL: 1357 val = inet->min_ttl; 1358 break; 1359 default: 1360 release_sock(sk); 1361 return -ENOPROTOOPT; 1362 } 1363 release_sock(sk); 1364 1365 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1366 unsigned char ucval = (unsigned char)val; 1367 len = 1; 1368 if (put_user(len, optlen)) 1369 return -EFAULT; 1370 if (copy_to_user(optval, &ucval, 1)) 1371 return -EFAULT; 1372 } else { 1373 len = min_t(unsigned int, sizeof(int), len); 1374 if (put_user(len, optlen)) 1375 return -EFAULT; 1376 if (copy_to_user(optval, &val, len)) 1377 return -EFAULT; 1378 } 1379 return 0; 1380 } 1381 1382 int ip_getsockopt(struct sock *sk, int level, 1383 int optname, char __user *optval, int __user *optlen) 1384 { 1385 int err; 1386 1387 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1388 #ifdef CONFIG_NETFILTER 1389 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1390 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1391 !ip_mroute_opt(optname)) { 1392 int len; 1393 1394 if (get_user(len, optlen)) 1395 return -EFAULT; 1396 1397 lock_sock(sk); 1398 err = nf_getsockopt(sk, PF_INET, optname, optval, 1399 &len); 1400 release_sock(sk); 1401 if (err >= 0) 1402 err = put_user(len, optlen); 1403 return err; 1404 } 1405 #endif 1406 return err; 1407 } 1408 EXPORT_SYMBOL(ip_getsockopt); 1409 1410 #ifdef CONFIG_COMPAT 1411 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1412 char __user *optval, int __user *optlen) 1413 { 1414 int err; 1415 1416 if (optname == MCAST_MSFILTER) 1417 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1418 ip_getsockopt); 1419 1420 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1421 MSG_CMSG_COMPAT); 1422 1423 #ifdef CONFIG_NETFILTER 1424 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1425 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1426 !ip_mroute_opt(optname)) { 1427 int len; 1428 1429 if (get_user(len, optlen)) 1430 return -EFAULT; 1431 1432 lock_sock(sk); 1433 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1434 release_sock(sk); 1435 if (err >= 0) 1436 err = put_user(len, optlen); 1437 return err; 1438 } 1439 #endif 1440 return err; 1441 } 1442 EXPORT_SYMBOL(compat_ip_getsockopt); 1443 #endif 1444