1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * The IP to API glue. 8 * 9 * Authors: see ip.c 10 * 11 * Fixes: 12 * Many : Split from ip.c , see ip.c for history. 13 * Martin Mares : TOS setting fixed. 14 * Alan Cox : Fixed a couple of oopses in Martin's 15 * TOS tweaks. 16 * Mike McLagan : Routing by source 17 */ 18 19 #include <linux/module.h> 20 #include <linux/types.h> 21 #include <linux/mm.h> 22 #include <linux/skbuff.h> 23 #include <linux/ip.h> 24 #include <linux/icmp.h> 25 #include <linux/inetdevice.h> 26 #include <linux/netdevice.h> 27 #include <linux/slab.h> 28 #include <net/sock.h> 29 #include <net/ip.h> 30 #include <net/icmp.h> 31 #include <net/tcp_states.h> 32 #include <linux/udp.h> 33 #include <linux/igmp.h> 34 #include <linux/netfilter.h> 35 #include <linux/route.h> 36 #include <linux/mroute.h> 37 #include <net/inet_ecn.h> 38 #include <net/route.h> 39 #include <net/xfrm.h> 40 #include <net/compat.h> 41 #include <net/checksum.h> 42 #if IS_ENABLED(CONFIG_IPV6) 43 #include <net/transp_v6.h> 44 #endif 45 #include <net/ip_fib.h> 46 47 #include <linux/errqueue.h> 48 #include <linux/uaccess.h> 49 50 #include <linux/bpfilter.h> 51 52 /* 53 * SOL_IP control messages. 54 */ 55 56 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) 57 { 58 struct in_pktinfo info = *PKTINFO_SKB_CB(skb); 59 60 info.ipi_addr.s_addr = ip_hdr(skb)->daddr; 61 62 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 63 } 64 65 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb) 66 { 67 int ttl = ip_hdr(skb)->ttl; 68 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl); 69 } 70 71 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb) 72 { 73 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos); 74 } 75 76 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb) 77 { 78 if (IPCB(skb)->opt.optlen == 0) 79 return; 80 81 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, 82 ip_hdr(skb) + 1); 83 } 84 85 86 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg, 87 struct sk_buff *skb) 88 { 89 unsigned char optbuf[sizeof(struct ip_options) + 40]; 90 struct ip_options *opt = (struct ip_options *)optbuf; 91 92 if (IPCB(skb)->opt.optlen == 0) 93 return; 94 95 if (ip_options_echo(net, opt, skb)) { 96 msg->msg_flags |= MSG_CTRUNC; 97 return; 98 } 99 ip_options_undo(opt); 100 101 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data); 102 } 103 104 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb) 105 { 106 int val; 107 108 if (IPCB(skb)->frag_max_size == 0) 109 return; 110 111 val = IPCB(skb)->frag_max_size; 112 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val); 113 } 114 115 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb, 116 int tlen, int offset) 117 { 118 __wsum csum = skb->csum; 119 120 if (skb->ip_summed != CHECKSUM_COMPLETE) 121 return; 122 123 if (offset != 0) { 124 int tend_off = skb_transport_offset(skb) + tlen; 125 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0)); 126 } 127 128 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum); 129 } 130 131 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb) 132 { 133 char *secdata; 134 u32 seclen, secid; 135 int err; 136 137 err = security_socket_getpeersec_dgram(NULL, skb, &secid); 138 if (err) 139 return; 140 141 err = security_secid_to_secctx(secid, &secdata, &seclen); 142 if (err) 143 return; 144 145 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata); 146 security_release_secctx(secdata, seclen); 147 } 148 149 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) 150 { 151 __be16 _ports[2], *ports; 152 struct sockaddr_in sin; 153 154 /* All current transport protocols have the port numbers in the 155 * first four bytes of the transport header and this function is 156 * written with this assumption in mind. 157 */ 158 ports = skb_header_pointer(skb, skb_transport_offset(skb), 159 sizeof(_ports), &_ports); 160 if (!ports) 161 return; 162 163 sin.sin_family = AF_INET; 164 sin.sin_addr.s_addr = ip_hdr(skb)->daddr; 165 sin.sin_port = ports[1]; 166 memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); 167 168 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); 169 } 170 171 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, 172 struct sk_buff *skb, int tlen, int offset) 173 { 174 struct inet_sock *inet = inet_sk(sk); 175 unsigned int flags = inet->cmsg_flags; 176 177 /* Ordered by supposed usage frequency */ 178 if (flags & IP_CMSG_PKTINFO) { 179 ip_cmsg_recv_pktinfo(msg, skb); 180 181 flags &= ~IP_CMSG_PKTINFO; 182 if (!flags) 183 return; 184 } 185 186 if (flags & IP_CMSG_TTL) { 187 ip_cmsg_recv_ttl(msg, skb); 188 189 flags &= ~IP_CMSG_TTL; 190 if (!flags) 191 return; 192 } 193 194 if (flags & IP_CMSG_TOS) { 195 ip_cmsg_recv_tos(msg, skb); 196 197 flags &= ~IP_CMSG_TOS; 198 if (!flags) 199 return; 200 } 201 202 if (flags & IP_CMSG_RECVOPTS) { 203 ip_cmsg_recv_opts(msg, skb); 204 205 flags &= ~IP_CMSG_RECVOPTS; 206 if (!flags) 207 return; 208 } 209 210 if (flags & IP_CMSG_RETOPTS) { 211 ip_cmsg_recv_retopts(sock_net(sk), msg, skb); 212 213 flags &= ~IP_CMSG_RETOPTS; 214 if (!flags) 215 return; 216 } 217 218 if (flags & IP_CMSG_PASSSEC) { 219 ip_cmsg_recv_security(msg, skb); 220 221 flags &= ~IP_CMSG_PASSSEC; 222 if (!flags) 223 return; 224 } 225 226 if (flags & IP_CMSG_ORIGDSTADDR) { 227 ip_cmsg_recv_dstaddr(msg, skb); 228 229 flags &= ~IP_CMSG_ORIGDSTADDR; 230 if (!flags) 231 return; 232 } 233 234 if (flags & IP_CMSG_CHECKSUM) 235 ip_cmsg_recv_checksum(msg, skb, tlen, offset); 236 237 if (flags & IP_CMSG_RECVFRAGSIZE) 238 ip_cmsg_recv_fragsize(msg, skb); 239 } 240 EXPORT_SYMBOL(ip_cmsg_recv_offset); 241 242 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, 243 bool allow_ipv6) 244 { 245 int err, val; 246 struct cmsghdr *cmsg; 247 struct net *net = sock_net(sk); 248 249 for_each_cmsghdr(cmsg, msg) { 250 if (!CMSG_OK(msg, cmsg)) 251 return -EINVAL; 252 #if IS_ENABLED(CONFIG_IPV6) 253 if (allow_ipv6 && 254 cmsg->cmsg_level == SOL_IPV6 && 255 cmsg->cmsg_type == IPV6_PKTINFO) { 256 struct in6_pktinfo *src_info; 257 258 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info))) 259 return -EINVAL; 260 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); 261 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr)) 262 return -EINVAL; 263 if (src_info->ipi6_ifindex) 264 ipc->oif = src_info->ipi6_ifindex; 265 ipc->addr = src_info->ipi6_addr.s6_addr32[3]; 266 continue; 267 } 268 #endif 269 if (cmsg->cmsg_level == SOL_SOCKET) { 270 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc); 271 if (err) 272 return err; 273 continue; 274 } 275 276 if (cmsg->cmsg_level != SOL_IP) 277 continue; 278 switch (cmsg->cmsg_type) { 279 case IP_RETOPTS: 280 err = cmsg->cmsg_len - sizeof(struct cmsghdr); 281 282 /* Our caller is responsible for freeing ipc->opt */ 283 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), 284 err < 40 ? err : 40); 285 if (err) 286 return err; 287 break; 288 case IP_PKTINFO: 289 { 290 struct in_pktinfo *info; 291 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo))) 292 return -EINVAL; 293 info = (struct in_pktinfo *)CMSG_DATA(cmsg); 294 if (info->ipi_ifindex) 295 ipc->oif = info->ipi_ifindex; 296 ipc->addr = info->ipi_spec_dst.s_addr; 297 break; 298 } 299 case IP_TTL: 300 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) 301 return -EINVAL; 302 val = *(int *)CMSG_DATA(cmsg); 303 if (val < 1 || val > 255) 304 return -EINVAL; 305 ipc->ttl = val; 306 break; 307 case IP_TOS: 308 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int))) 309 val = *(int *)CMSG_DATA(cmsg); 310 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8))) 311 val = *(u8 *)CMSG_DATA(cmsg); 312 else 313 return -EINVAL; 314 if (val < 0 || val > 255) 315 return -EINVAL; 316 ipc->tos = val; 317 ipc->priority = rt_tos2priority(ipc->tos); 318 break; 319 320 default: 321 return -EINVAL; 322 } 323 } 324 return 0; 325 } 326 327 static void ip_ra_destroy_rcu(struct rcu_head *head) 328 { 329 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu); 330 331 sock_put(ra->saved_sk); 332 kfree(ra); 333 } 334 335 int ip_ra_control(struct sock *sk, unsigned char on, 336 void (*destructor)(struct sock *)) 337 { 338 struct ip_ra_chain *ra, *new_ra; 339 struct ip_ra_chain __rcu **rap; 340 struct net *net = sock_net(sk); 341 342 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW) 343 return -EINVAL; 344 345 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL; 346 347 mutex_lock(&net->ipv4.ra_mutex); 348 for (rap = &net->ipv4.ra_chain; 349 (ra = rcu_dereference_protected(*rap, 350 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; 351 rap = &ra->next) { 352 if (ra->sk == sk) { 353 if (on) { 354 mutex_unlock(&net->ipv4.ra_mutex); 355 kfree(new_ra); 356 return -EADDRINUSE; 357 } 358 /* dont let ip_call_ra_chain() use sk again */ 359 ra->sk = NULL; 360 RCU_INIT_POINTER(*rap, ra->next); 361 mutex_unlock(&net->ipv4.ra_mutex); 362 363 if (ra->destructor) 364 ra->destructor(sk); 365 /* 366 * Delay sock_put(sk) and kfree(ra) after one rcu grace 367 * period. This guarantee ip_call_ra_chain() dont need 368 * to mess with socket refcounts. 369 */ 370 ra->saved_sk = sk; 371 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 372 return 0; 373 } 374 } 375 if (!new_ra) { 376 mutex_unlock(&net->ipv4.ra_mutex); 377 return -ENOBUFS; 378 } 379 new_ra->sk = sk; 380 new_ra->destructor = destructor; 381 382 RCU_INIT_POINTER(new_ra->next, ra); 383 rcu_assign_pointer(*rap, new_ra); 384 sock_hold(sk); 385 mutex_unlock(&net->ipv4.ra_mutex); 386 387 return 0; 388 } 389 390 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 391 __be16 port, u32 info, u8 *payload) 392 { 393 struct sock_exterr_skb *serr; 394 395 skb = skb_clone(skb, GFP_ATOMIC); 396 if (!skb) 397 return; 398 399 serr = SKB_EXT_ERR(skb); 400 serr->ee.ee_errno = err; 401 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 402 serr->ee.ee_type = icmp_hdr(skb)->type; 403 serr->ee.ee_code = icmp_hdr(skb)->code; 404 serr->ee.ee_pad = 0; 405 serr->ee.ee_info = info; 406 serr->ee.ee_data = 0; 407 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 408 skb_network_header(skb); 409 serr->port = port; 410 411 if (skb_pull(skb, payload - skb->data)) { 412 skb_reset_transport_header(skb); 413 if (sock_queue_err_skb(sk, skb) == 0) 414 return; 415 } 416 kfree_skb(skb); 417 } 418 419 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 420 { 421 struct inet_sock *inet = inet_sk(sk); 422 struct sock_exterr_skb *serr; 423 struct iphdr *iph; 424 struct sk_buff *skb; 425 426 if (!inet->recverr) 427 return; 428 429 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 430 if (!skb) 431 return; 432 433 skb_put(skb, sizeof(struct iphdr)); 434 skb_reset_network_header(skb); 435 iph = ip_hdr(skb); 436 iph->daddr = daddr; 437 438 serr = SKB_EXT_ERR(skb); 439 serr->ee.ee_errno = err; 440 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 441 serr->ee.ee_type = 0; 442 serr->ee.ee_code = 0; 443 serr->ee.ee_pad = 0; 444 serr->ee.ee_info = info; 445 serr->ee.ee_data = 0; 446 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 447 serr->port = port; 448 449 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 450 skb_reset_transport_header(skb); 451 452 if (sock_queue_err_skb(sk, skb)) 453 kfree_skb(skb); 454 } 455 456 /* For some errors we have valid addr_offset even with zero payload and 457 * zero port. Also, addr_offset should be supported if port is set. 458 */ 459 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 460 { 461 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 462 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 463 } 464 465 /* IPv4 supports cmsg on all imcp errors and some timestamps 466 * 467 * Timestamp code paths do not initialize the fields expected by cmsg: 468 * the PKTINFO fields in skb->cb[]. Fill those in here. 469 */ 470 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 471 struct sk_buff *skb, 472 int ee_origin) 473 { 474 struct in_pktinfo *info; 475 476 if (ee_origin == SO_EE_ORIGIN_ICMP) 477 return true; 478 479 if (ee_origin == SO_EE_ORIGIN_LOCAL) 480 return false; 481 482 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 483 * timestamp with egress dev. Not possible for packets without iif 484 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 485 */ 486 info = PKTINFO_SKB_CB(skb); 487 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 488 !info->ipi_ifindex) 489 return false; 490 491 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 492 return true; 493 } 494 495 /* 496 * Handle MSG_ERRQUEUE 497 */ 498 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 499 { 500 struct sock_exterr_skb *serr; 501 struct sk_buff *skb; 502 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 503 struct { 504 struct sock_extended_err ee; 505 struct sockaddr_in offender; 506 } errhdr; 507 int err; 508 int copied; 509 510 err = -EAGAIN; 511 skb = sock_dequeue_err_skb(sk); 512 if (!skb) 513 goto out; 514 515 copied = skb->len; 516 if (copied > len) { 517 msg->msg_flags |= MSG_TRUNC; 518 copied = len; 519 } 520 err = skb_copy_datagram_msg(skb, 0, msg, copied); 521 if (unlikely(err)) { 522 kfree_skb(skb); 523 return err; 524 } 525 sock_recv_timestamp(msg, sk, skb); 526 527 serr = SKB_EXT_ERR(skb); 528 529 if (sin && ipv4_datagram_support_addr(serr)) { 530 sin->sin_family = AF_INET; 531 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 532 serr->addr_offset); 533 sin->sin_port = serr->port; 534 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 535 *addr_len = sizeof(*sin); 536 } 537 538 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 539 sin = &errhdr.offender; 540 memset(sin, 0, sizeof(*sin)); 541 542 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 543 sin->sin_family = AF_INET; 544 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 545 if (inet_sk(sk)->cmsg_flags) 546 ip_cmsg_recv(msg, skb); 547 } 548 549 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 550 551 /* Now we could try to dump offended packet options */ 552 553 msg->msg_flags |= MSG_ERRQUEUE; 554 err = copied; 555 556 consume_skb(skb); 557 out: 558 return err; 559 } 560 561 562 /* 563 * Socket option code for IP. This is the end of the line after any 564 * TCP,UDP etc options on an IP socket. 565 */ 566 static bool setsockopt_needs_rtnl(int optname) 567 { 568 switch (optname) { 569 case IP_ADD_MEMBERSHIP: 570 case IP_ADD_SOURCE_MEMBERSHIP: 571 case IP_BLOCK_SOURCE: 572 case IP_DROP_MEMBERSHIP: 573 case IP_DROP_SOURCE_MEMBERSHIP: 574 case IP_MSFILTER: 575 case IP_UNBLOCK_SOURCE: 576 case MCAST_BLOCK_SOURCE: 577 case MCAST_MSFILTER: 578 case MCAST_JOIN_GROUP: 579 case MCAST_JOIN_SOURCE_GROUP: 580 case MCAST_LEAVE_GROUP: 581 case MCAST_LEAVE_SOURCE_GROUP: 582 case MCAST_UNBLOCK_SOURCE: 583 return true; 584 } 585 return false; 586 } 587 588 static int do_ip_setsockopt(struct sock *sk, int level, 589 int optname, char __user *optval, unsigned int optlen) 590 { 591 struct inet_sock *inet = inet_sk(sk); 592 struct net *net = sock_net(sk); 593 int val = 0, err; 594 bool needs_rtnl = setsockopt_needs_rtnl(optname); 595 596 switch (optname) { 597 case IP_PKTINFO: 598 case IP_RECVTTL: 599 case IP_RECVOPTS: 600 case IP_RECVTOS: 601 case IP_RETOPTS: 602 case IP_TOS: 603 case IP_TTL: 604 case IP_HDRINCL: 605 case IP_MTU_DISCOVER: 606 case IP_RECVERR: 607 case IP_ROUTER_ALERT: 608 case IP_FREEBIND: 609 case IP_PASSSEC: 610 case IP_TRANSPARENT: 611 case IP_MINTTL: 612 case IP_NODEFRAG: 613 case IP_BIND_ADDRESS_NO_PORT: 614 case IP_UNICAST_IF: 615 case IP_MULTICAST_TTL: 616 case IP_MULTICAST_ALL: 617 case IP_MULTICAST_LOOP: 618 case IP_RECVORIGDSTADDR: 619 case IP_CHECKSUM: 620 case IP_RECVFRAGSIZE: 621 if (optlen >= sizeof(int)) { 622 if (get_user(val, (int __user *) optval)) 623 return -EFAULT; 624 } else if (optlen >= sizeof(char)) { 625 unsigned char ucval; 626 627 if (get_user(ucval, (unsigned char __user *) optval)) 628 return -EFAULT; 629 val = (int) ucval; 630 } 631 } 632 633 /* If optlen==0, it is equivalent to val == 0 */ 634 635 if (optname == IP_ROUTER_ALERT) 636 return ip_ra_control(sk, val ? 1 : 0, NULL); 637 if (ip_mroute_opt(optname)) 638 return ip_mroute_setsockopt(sk, optname, optval, optlen); 639 640 err = 0; 641 if (needs_rtnl) 642 rtnl_lock(); 643 lock_sock(sk); 644 645 switch (optname) { 646 case IP_OPTIONS: 647 { 648 struct ip_options_rcu *old, *opt = NULL; 649 650 if (optlen > 40) 651 goto e_inval; 652 err = ip_options_get_from_user(sock_net(sk), &opt, 653 optval, optlen); 654 if (err) 655 break; 656 old = rcu_dereference_protected(inet->inet_opt, 657 lockdep_sock_is_held(sk)); 658 if (inet->is_icsk) { 659 struct inet_connection_sock *icsk = inet_csk(sk); 660 #if IS_ENABLED(CONFIG_IPV6) 661 if (sk->sk_family == PF_INET || 662 (!((1 << sk->sk_state) & 663 (TCPF_LISTEN | TCPF_CLOSE)) && 664 inet->inet_daddr != LOOPBACK4_IPV6)) { 665 #endif 666 if (old) 667 icsk->icsk_ext_hdr_len -= old->opt.optlen; 668 if (opt) 669 icsk->icsk_ext_hdr_len += opt->opt.optlen; 670 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 671 #if IS_ENABLED(CONFIG_IPV6) 672 } 673 #endif 674 } 675 rcu_assign_pointer(inet->inet_opt, opt); 676 if (old) 677 kfree_rcu(old, rcu); 678 break; 679 } 680 case IP_PKTINFO: 681 if (val) 682 inet->cmsg_flags |= IP_CMSG_PKTINFO; 683 else 684 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 685 break; 686 case IP_RECVTTL: 687 if (val) 688 inet->cmsg_flags |= IP_CMSG_TTL; 689 else 690 inet->cmsg_flags &= ~IP_CMSG_TTL; 691 break; 692 case IP_RECVTOS: 693 if (val) 694 inet->cmsg_flags |= IP_CMSG_TOS; 695 else 696 inet->cmsg_flags &= ~IP_CMSG_TOS; 697 break; 698 case IP_RECVOPTS: 699 if (val) 700 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 701 else 702 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 703 break; 704 case IP_RETOPTS: 705 if (val) 706 inet->cmsg_flags |= IP_CMSG_RETOPTS; 707 else 708 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 709 break; 710 case IP_PASSSEC: 711 if (val) 712 inet->cmsg_flags |= IP_CMSG_PASSSEC; 713 else 714 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 715 break; 716 case IP_RECVORIGDSTADDR: 717 if (val) 718 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 719 else 720 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 721 break; 722 case IP_CHECKSUM: 723 if (val) { 724 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 725 inet_inc_convert_csum(sk); 726 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 727 } 728 } else { 729 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 730 inet_dec_convert_csum(sk); 731 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 732 } 733 } 734 break; 735 case IP_RECVFRAGSIZE: 736 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 737 goto e_inval; 738 if (val) 739 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 740 else 741 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 742 break; 743 case IP_TOS: /* This sets both TOS and Precedence */ 744 if (sk->sk_type == SOCK_STREAM) { 745 val &= ~INET_ECN_MASK; 746 val |= inet->tos & INET_ECN_MASK; 747 } 748 if (inet->tos != val) { 749 inet->tos = val; 750 sk->sk_priority = rt_tos2priority(val); 751 sk_dst_reset(sk); 752 } 753 break; 754 case IP_TTL: 755 if (optlen < 1) 756 goto e_inval; 757 if (val != -1 && (val < 1 || val > 255)) 758 goto e_inval; 759 inet->uc_ttl = val; 760 break; 761 case IP_HDRINCL: 762 if (sk->sk_type != SOCK_RAW) { 763 err = -ENOPROTOOPT; 764 break; 765 } 766 inet->hdrincl = val ? 1 : 0; 767 break; 768 case IP_NODEFRAG: 769 if (sk->sk_type != SOCK_RAW) { 770 err = -ENOPROTOOPT; 771 break; 772 } 773 inet->nodefrag = val ? 1 : 0; 774 break; 775 case IP_BIND_ADDRESS_NO_PORT: 776 inet->bind_address_no_port = val ? 1 : 0; 777 break; 778 case IP_MTU_DISCOVER: 779 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 780 goto e_inval; 781 inet->pmtudisc = val; 782 break; 783 case IP_RECVERR: 784 inet->recverr = !!val; 785 if (!val) 786 skb_queue_purge(&sk->sk_error_queue); 787 break; 788 case IP_MULTICAST_TTL: 789 if (sk->sk_type == SOCK_STREAM) 790 goto e_inval; 791 if (optlen < 1) 792 goto e_inval; 793 if (val == -1) 794 val = 1; 795 if (val < 0 || val > 255) 796 goto e_inval; 797 inet->mc_ttl = val; 798 break; 799 case IP_MULTICAST_LOOP: 800 if (optlen < 1) 801 goto e_inval; 802 inet->mc_loop = !!val; 803 break; 804 case IP_UNICAST_IF: 805 { 806 struct net_device *dev = NULL; 807 int ifindex; 808 int midx; 809 810 if (optlen != sizeof(int)) 811 goto e_inval; 812 813 ifindex = (__force int)ntohl((__force __be32)val); 814 if (ifindex == 0) { 815 inet->uc_index = 0; 816 err = 0; 817 break; 818 } 819 820 dev = dev_get_by_index(sock_net(sk), ifindex); 821 err = -EADDRNOTAVAIL; 822 if (!dev) 823 break; 824 825 midx = l3mdev_master_ifindex(dev); 826 dev_put(dev); 827 828 err = -EINVAL; 829 if (sk->sk_bound_dev_if && 830 (!midx || midx != sk->sk_bound_dev_if)) 831 break; 832 833 inet->uc_index = ifindex; 834 err = 0; 835 break; 836 } 837 case IP_MULTICAST_IF: 838 { 839 struct ip_mreqn mreq; 840 struct net_device *dev = NULL; 841 int midx; 842 843 if (sk->sk_type == SOCK_STREAM) 844 goto e_inval; 845 /* 846 * Check the arguments are allowable 847 */ 848 849 if (optlen < sizeof(struct in_addr)) 850 goto e_inval; 851 852 err = -EFAULT; 853 if (optlen >= sizeof(struct ip_mreqn)) { 854 if (copy_from_user(&mreq, optval, sizeof(mreq))) 855 break; 856 } else { 857 memset(&mreq, 0, sizeof(mreq)); 858 if (optlen >= sizeof(struct ip_mreq)) { 859 if (copy_from_user(&mreq, optval, 860 sizeof(struct ip_mreq))) 861 break; 862 } else if (optlen >= sizeof(struct in_addr)) { 863 if (copy_from_user(&mreq.imr_address, optval, 864 sizeof(struct in_addr))) 865 break; 866 } 867 } 868 869 if (!mreq.imr_ifindex) { 870 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 871 inet->mc_index = 0; 872 inet->mc_addr = 0; 873 err = 0; 874 break; 875 } 876 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 877 if (dev) 878 mreq.imr_ifindex = dev->ifindex; 879 } else 880 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 881 882 883 err = -EADDRNOTAVAIL; 884 if (!dev) 885 break; 886 887 midx = l3mdev_master_ifindex(dev); 888 889 dev_put(dev); 890 891 err = -EINVAL; 892 if (sk->sk_bound_dev_if && 893 mreq.imr_ifindex != sk->sk_bound_dev_if && 894 (!midx || midx != sk->sk_bound_dev_if)) 895 break; 896 897 inet->mc_index = mreq.imr_ifindex; 898 inet->mc_addr = mreq.imr_address.s_addr; 899 err = 0; 900 break; 901 } 902 903 case IP_ADD_MEMBERSHIP: 904 case IP_DROP_MEMBERSHIP: 905 { 906 struct ip_mreqn mreq; 907 908 err = -EPROTO; 909 if (inet_sk(sk)->is_icsk) 910 break; 911 912 if (optlen < sizeof(struct ip_mreq)) 913 goto e_inval; 914 err = -EFAULT; 915 if (optlen >= sizeof(struct ip_mreqn)) { 916 if (copy_from_user(&mreq, optval, sizeof(mreq))) 917 break; 918 } else { 919 memset(&mreq, 0, sizeof(mreq)); 920 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 921 break; 922 } 923 924 if (optname == IP_ADD_MEMBERSHIP) 925 err = ip_mc_join_group(sk, &mreq); 926 else 927 err = ip_mc_leave_group(sk, &mreq); 928 break; 929 } 930 case IP_MSFILTER: 931 { 932 struct ip_msfilter *msf; 933 934 if (optlen < IP_MSFILTER_SIZE(0)) 935 goto e_inval; 936 if (optlen > sysctl_optmem_max) { 937 err = -ENOBUFS; 938 break; 939 } 940 msf = memdup_user(optval, optlen); 941 if (IS_ERR(msf)) { 942 err = PTR_ERR(msf); 943 break; 944 } 945 /* numsrc >= (1G-4) overflow in 32 bits */ 946 if (msf->imsf_numsrc >= 0x3ffffffcU || 947 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 948 kfree(msf); 949 err = -ENOBUFS; 950 break; 951 } 952 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 953 kfree(msf); 954 err = -EINVAL; 955 break; 956 } 957 err = ip_mc_msfilter(sk, msf, 0); 958 kfree(msf); 959 break; 960 } 961 case IP_BLOCK_SOURCE: 962 case IP_UNBLOCK_SOURCE: 963 case IP_ADD_SOURCE_MEMBERSHIP: 964 case IP_DROP_SOURCE_MEMBERSHIP: 965 { 966 struct ip_mreq_source mreqs; 967 int omode, add; 968 969 if (optlen != sizeof(struct ip_mreq_source)) 970 goto e_inval; 971 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 972 err = -EFAULT; 973 break; 974 } 975 if (optname == IP_BLOCK_SOURCE) { 976 omode = MCAST_EXCLUDE; 977 add = 1; 978 } else if (optname == IP_UNBLOCK_SOURCE) { 979 omode = MCAST_EXCLUDE; 980 add = 0; 981 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 982 struct ip_mreqn mreq; 983 984 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 985 mreq.imr_address.s_addr = mreqs.imr_interface; 986 mreq.imr_ifindex = 0; 987 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 988 if (err && err != -EADDRINUSE) 989 break; 990 omode = MCAST_INCLUDE; 991 add = 1; 992 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 993 omode = MCAST_INCLUDE; 994 add = 0; 995 } 996 err = ip_mc_source(add, omode, sk, &mreqs, 0); 997 break; 998 } 999 case MCAST_JOIN_GROUP: 1000 case MCAST_LEAVE_GROUP: 1001 { 1002 struct group_req greq; 1003 struct sockaddr_in *psin; 1004 struct ip_mreqn mreq; 1005 1006 if (optlen < sizeof(struct group_req)) 1007 goto e_inval; 1008 err = -EFAULT; 1009 if (copy_from_user(&greq, optval, sizeof(greq))) 1010 break; 1011 psin = (struct sockaddr_in *)&greq.gr_group; 1012 if (psin->sin_family != AF_INET) 1013 goto e_inval; 1014 memset(&mreq, 0, sizeof(mreq)); 1015 mreq.imr_multiaddr = psin->sin_addr; 1016 mreq.imr_ifindex = greq.gr_interface; 1017 1018 if (optname == MCAST_JOIN_GROUP) 1019 err = ip_mc_join_group(sk, &mreq); 1020 else 1021 err = ip_mc_leave_group(sk, &mreq); 1022 break; 1023 } 1024 case MCAST_JOIN_SOURCE_GROUP: 1025 case MCAST_LEAVE_SOURCE_GROUP: 1026 case MCAST_BLOCK_SOURCE: 1027 case MCAST_UNBLOCK_SOURCE: 1028 { 1029 struct group_source_req greqs; 1030 struct ip_mreq_source mreqs; 1031 struct sockaddr_in *psin; 1032 int omode, add; 1033 1034 if (optlen != sizeof(struct group_source_req)) 1035 goto e_inval; 1036 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1037 err = -EFAULT; 1038 break; 1039 } 1040 if (greqs.gsr_group.ss_family != AF_INET || 1041 greqs.gsr_source.ss_family != AF_INET) { 1042 err = -EADDRNOTAVAIL; 1043 break; 1044 } 1045 psin = (struct sockaddr_in *)&greqs.gsr_group; 1046 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1047 psin = (struct sockaddr_in *)&greqs.gsr_source; 1048 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1049 mreqs.imr_interface = 0; /* use index for mc_source */ 1050 1051 if (optname == MCAST_BLOCK_SOURCE) { 1052 omode = MCAST_EXCLUDE; 1053 add = 1; 1054 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1055 omode = MCAST_EXCLUDE; 1056 add = 0; 1057 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1058 struct ip_mreqn mreq; 1059 1060 psin = (struct sockaddr_in *)&greqs.gsr_group; 1061 mreq.imr_multiaddr = psin->sin_addr; 1062 mreq.imr_address.s_addr = 0; 1063 mreq.imr_ifindex = greqs.gsr_interface; 1064 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 1065 if (err && err != -EADDRINUSE) 1066 break; 1067 greqs.gsr_interface = mreq.imr_ifindex; 1068 omode = MCAST_INCLUDE; 1069 add = 1; 1070 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1071 omode = MCAST_INCLUDE; 1072 add = 0; 1073 } 1074 err = ip_mc_source(add, omode, sk, &mreqs, 1075 greqs.gsr_interface); 1076 break; 1077 } 1078 case MCAST_MSFILTER: 1079 { 1080 struct sockaddr_in *psin; 1081 struct ip_msfilter *msf = NULL; 1082 struct group_filter *gsf = NULL; 1083 int msize, i, ifindex; 1084 1085 if (optlen < GROUP_FILTER_SIZE(0)) 1086 goto e_inval; 1087 if (optlen > sysctl_optmem_max) { 1088 err = -ENOBUFS; 1089 break; 1090 } 1091 gsf = memdup_user(optval, optlen); 1092 if (IS_ERR(gsf)) { 1093 err = PTR_ERR(gsf); 1094 break; 1095 } 1096 1097 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1098 if (gsf->gf_numsrc >= 0x1ffffff || 1099 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1100 err = -ENOBUFS; 1101 goto mc_msf_out; 1102 } 1103 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1104 err = -EINVAL; 1105 goto mc_msf_out; 1106 } 1107 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1108 msf = kmalloc(msize, GFP_KERNEL); 1109 if (!msf) { 1110 err = -ENOBUFS; 1111 goto mc_msf_out; 1112 } 1113 ifindex = gsf->gf_interface; 1114 psin = (struct sockaddr_in *)&gsf->gf_group; 1115 if (psin->sin_family != AF_INET) { 1116 err = -EADDRNOTAVAIL; 1117 goto mc_msf_out; 1118 } 1119 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1120 msf->imsf_interface = 0; 1121 msf->imsf_fmode = gsf->gf_fmode; 1122 msf->imsf_numsrc = gsf->gf_numsrc; 1123 err = -EADDRNOTAVAIL; 1124 for (i = 0; i < gsf->gf_numsrc; ++i) { 1125 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1126 1127 if (psin->sin_family != AF_INET) 1128 goto mc_msf_out; 1129 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1130 } 1131 kfree(gsf); 1132 gsf = NULL; 1133 1134 err = ip_mc_msfilter(sk, msf, ifindex); 1135 mc_msf_out: 1136 kfree(msf); 1137 kfree(gsf); 1138 break; 1139 } 1140 case IP_MULTICAST_ALL: 1141 if (optlen < 1) 1142 goto e_inval; 1143 if (val != 0 && val != 1) 1144 goto e_inval; 1145 inet->mc_all = val; 1146 break; 1147 1148 case IP_FREEBIND: 1149 if (optlen < 1) 1150 goto e_inval; 1151 inet->freebind = !!val; 1152 break; 1153 1154 case IP_IPSEC_POLICY: 1155 case IP_XFRM_POLICY: 1156 err = -EPERM; 1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1158 break; 1159 err = xfrm_user_policy(sk, optname, optval, optlen); 1160 break; 1161 1162 case IP_TRANSPARENT: 1163 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1164 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1165 err = -EPERM; 1166 break; 1167 } 1168 if (optlen < 1) 1169 goto e_inval; 1170 inet->transparent = !!val; 1171 break; 1172 1173 case IP_MINTTL: 1174 if (optlen < 1) 1175 goto e_inval; 1176 if (val < 0 || val > 255) 1177 goto e_inval; 1178 inet->min_ttl = val; 1179 break; 1180 1181 default: 1182 err = -ENOPROTOOPT; 1183 break; 1184 } 1185 release_sock(sk); 1186 if (needs_rtnl) 1187 rtnl_unlock(); 1188 return err; 1189 1190 e_inval: 1191 release_sock(sk); 1192 if (needs_rtnl) 1193 rtnl_unlock(); 1194 return -EINVAL; 1195 } 1196 1197 /** 1198 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1199 * @sk: socket 1200 * @skb: buffer 1201 * 1202 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1203 * destination in skb->cb[] before dst drop. 1204 * This way, receiver doesn't make cache line misses to read rtable. 1205 */ 1206 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1207 { 1208 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1209 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1210 ipv6_sk_rxinfo(sk); 1211 1212 if (prepare && skb_rtable(skb)) { 1213 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1214 * which has interface index (iif) as the first member of the 1215 * underlying inet{6}_skb_parm struct. This code then overlays 1216 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1217 * element so the iif is picked up from the prior IPCB. If iif 1218 * is the loopback interface, then return the sending interface 1219 * (e.g., process binds socket to eth0 for Tx which is 1220 * redirected to loopback in the rtable/dst). 1221 */ 1222 struct rtable *rt = skb_rtable(skb); 1223 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1224 1225 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1226 pktinfo->ipi_ifindex = inet_iif(skb); 1227 else if (l3slave && rt && rt->rt_iif) 1228 pktinfo->ipi_ifindex = rt->rt_iif; 1229 1230 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1231 } else { 1232 pktinfo->ipi_ifindex = 0; 1233 pktinfo->ipi_spec_dst.s_addr = 0; 1234 } 1235 skb_dst_drop(skb); 1236 } 1237 1238 int ip_setsockopt(struct sock *sk, int level, 1239 int optname, char __user *optval, unsigned int optlen) 1240 { 1241 int err; 1242 1243 if (level != SOL_IP) 1244 return -ENOPROTOOPT; 1245 1246 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1247 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1248 if (optname >= BPFILTER_IPT_SO_SET_REPLACE && 1249 optname < BPFILTER_IPT_SET_MAX) 1250 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); 1251 #endif 1252 #ifdef CONFIG_NETFILTER 1253 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1254 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1255 optname != IP_IPSEC_POLICY && 1256 optname != IP_XFRM_POLICY && 1257 !ip_mroute_opt(optname)) 1258 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1259 #endif 1260 return err; 1261 } 1262 EXPORT_SYMBOL(ip_setsockopt); 1263 1264 #ifdef CONFIG_COMPAT 1265 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1266 char __user *optval, unsigned int optlen) 1267 { 1268 int err; 1269 1270 if (level != SOL_IP) 1271 return -ENOPROTOOPT; 1272 1273 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1274 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1275 ip_setsockopt); 1276 1277 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1278 #ifdef CONFIG_NETFILTER 1279 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1280 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1281 optname != IP_IPSEC_POLICY && 1282 optname != IP_XFRM_POLICY && 1283 !ip_mroute_opt(optname)) 1284 err = compat_nf_setsockopt(sk, PF_INET, optname, optval, 1285 optlen); 1286 #endif 1287 return err; 1288 } 1289 EXPORT_SYMBOL(compat_ip_setsockopt); 1290 #endif 1291 1292 /* 1293 * Get the options. Note for future reference. The GET of IP options gets 1294 * the _received_ ones. The set sets the _sent_ ones. 1295 */ 1296 1297 static bool getsockopt_needs_rtnl(int optname) 1298 { 1299 switch (optname) { 1300 case IP_MSFILTER: 1301 case MCAST_MSFILTER: 1302 return true; 1303 } 1304 return false; 1305 } 1306 1307 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1308 char __user *optval, int __user *optlen, unsigned int flags) 1309 { 1310 struct inet_sock *inet = inet_sk(sk); 1311 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1312 int val, err = 0; 1313 int len; 1314 1315 if (level != SOL_IP) 1316 return -EOPNOTSUPP; 1317 1318 if (ip_mroute_opt(optname)) 1319 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1320 1321 if (get_user(len, optlen)) 1322 return -EFAULT; 1323 if (len < 0) 1324 return -EINVAL; 1325 1326 if (needs_rtnl) 1327 rtnl_lock(); 1328 lock_sock(sk); 1329 1330 switch (optname) { 1331 case IP_OPTIONS: 1332 { 1333 unsigned char optbuf[sizeof(struct ip_options)+40]; 1334 struct ip_options *opt = (struct ip_options *)optbuf; 1335 struct ip_options_rcu *inet_opt; 1336 1337 inet_opt = rcu_dereference_protected(inet->inet_opt, 1338 lockdep_sock_is_held(sk)); 1339 opt->optlen = 0; 1340 if (inet_opt) 1341 memcpy(optbuf, &inet_opt->opt, 1342 sizeof(struct ip_options) + 1343 inet_opt->opt.optlen); 1344 release_sock(sk); 1345 1346 if (opt->optlen == 0) 1347 return put_user(0, optlen); 1348 1349 ip_options_undo(opt); 1350 1351 len = min_t(unsigned int, len, opt->optlen); 1352 if (put_user(len, optlen)) 1353 return -EFAULT; 1354 if (copy_to_user(optval, opt->__data, len)) 1355 return -EFAULT; 1356 return 0; 1357 } 1358 case IP_PKTINFO: 1359 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1360 break; 1361 case IP_RECVTTL: 1362 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1363 break; 1364 case IP_RECVTOS: 1365 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1366 break; 1367 case IP_RECVOPTS: 1368 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1369 break; 1370 case IP_RETOPTS: 1371 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1372 break; 1373 case IP_PASSSEC: 1374 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1375 break; 1376 case IP_RECVORIGDSTADDR: 1377 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1378 break; 1379 case IP_CHECKSUM: 1380 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1381 break; 1382 case IP_RECVFRAGSIZE: 1383 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1384 break; 1385 case IP_TOS: 1386 val = inet->tos; 1387 break; 1388 case IP_TTL: 1389 { 1390 struct net *net = sock_net(sk); 1391 val = (inet->uc_ttl == -1 ? 1392 net->ipv4.sysctl_ip_default_ttl : 1393 inet->uc_ttl); 1394 break; 1395 } 1396 case IP_HDRINCL: 1397 val = inet->hdrincl; 1398 break; 1399 case IP_NODEFRAG: 1400 val = inet->nodefrag; 1401 break; 1402 case IP_BIND_ADDRESS_NO_PORT: 1403 val = inet->bind_address_no_port; 1404 break; 1405 case IP_MTU_DISCOVER: 1406 val = inet->pmtudisc; 1407 break; 1408 case IP_MTU: 1409 { 1410 struct dst_entry *dst; 1411 val = 0; 1412 dst = sk_dst_get(sk); 1413 if (dst) { 1414 val = dst_mtu(dst); 1415 dst_release(dst); 1416 } 1417 if (!val) { 1418 release_sock(sk); 1419 return -ENOTCONN; 1420 } 1421 break; 1422 } 1423 case IP_RECVERR: 1424 val = inet->recverr; 1425 break; 1426 case IP_MULTICAST_TTL: 1427 val = inet->mc_ttl; 1428 break; 1429 case IP_MULTICAST_LOOP: 1430 val = inet->mc_loop; 1431 break; 1432 case IP_UNICAST_IF: 1433 val = (__force int)htonl((__u32) inet->uc_index); 1434 break; 1435 case IP_MULTICAST_IF: 1436 { 1437 struct in_addr addr; 1438 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1439 addr.s_addr = inet->mc_addr; 1440 release_sock(sk); 1441 1442 if (put_user(len, optlen)) 1443 return -EFAULT; 1444 if (copy_to_user(optval, &addr, len)) 1445 return -EFAULT; 1446 return 0; 1447 } 1448 case IP_MSFILTER: 1449 { 1450 struct ip_msfilter msf; 1451 1452 if (len < IP_MSFILTER_SIZE(0)) { 1453 err = -EINVAL; 1454 goto out; 1455 } 1456 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1457 err = -EFAULT; 1458 goto out; 1459 } 1460 err = ip_mc_msfget(sk, &msf, 1461 (struct ip_msfilter __user *)optval, optlen); 1462 goto out; 1463 } 1464 case MCAST_MSFILTER: 1465 { 1466 struct group_filter gsf; 1467 1468 if (len < GROUP_FILTER_SIZE(0)) { 1469 err = -EINVAL; 1470 goto out; 1471 } 1472 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1473 err = -EFAULT; 1474 goto out; 1475 } 1476 err = ip_mc_gsfget(sk, &gsf, 1477 (struct group_filter __user *)optval, 1478 optlen); 1479 goto out; 1480 } 1481 case IP_MULTICAST_ALL: 1482 val = inet->mc_all; 1483 break; 1484 case IP_PKTOPTIONS: 1485 { 1486 struct msghdr msg; 1487 1488 release_sock(sk); 1489 1490 if (sk->sk_type != SOCK_STREAM) 1491 return -ENOPROTOOPT; 1492 1493 msg.msg_control = (__force void *) optval; 1494 msg.msg_controllen = len; 1495 msg.msg_flags = flags; 1496 1497 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1498 struct in_pktinfo info; 1499 1500 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1501 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1502 info.ipi_ifindex = inet->mc_index; 1503 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1504 } 1505 if (inet->cmsg_flags & IP_CMSG_TTL) { 1506 int hlim = inet->mc_ttl; 1507 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1508 } 1509 if (inet->cmsg_flags & IP_CMSG_TOS) { 1510 int tos = inet->rcv_tos; 1511 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1512 } 1513 len -= msg.msg_controllen; 1514 return put_user(len, optlen); 1515 } 1516 case IP_FREEBIND: 1517 val = inet->freebind; 1518 break; 1519 case IP_TRANSPARENT: 1520 val = inet->transparent; 1521 break; 1522 case IP_MINTTL: 1523 val = inet->min_ttl; 1524 break; 1525 default: 1526 release_sock(sk); 1527 return -ENOPROTOOPT; 1528 } 1529 release_sock(sk); 1530 1531 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1532 unsigned char ucval = (unsigned char)val; 1533 len = 1; 1534 if (put_user(len, optlen)) 1535 return -EFAULT; 1536 if (copy_to_user(optval, &ucval, 1)) 1537 return -EFAULT; 1538 } else { 1539 len = min_t(unsigned int, sizeof(int), len); 1540 if (put_user(len, optlen)) 1541 return -EFAULT; 1542 if (copy_to_user(optval, &val, len)) 1543 return -EFAULT; 1544 } 1545 return 0; 1546 1547 out: 1548 release_sock(sk); 1549 if (needs_rtnl) 1550 rtnl_unlock(); 1551 return err; 1552 } 1553 1554 int ip_getsockopt(struct sock *sk, int level, 1555 int optname, char __user *optval, int __user *optlen) 1556 { 1557 int err; 1558 1559 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1560 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1561 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1562 optname < BPFILTER_IPT_GET_MAX) 1563 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1564 #endif 1565 #ifdef CONFIG_NETFILTER 1566 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1567 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1568 !ip_mroute_opt(optname)) { 1569 int len; 1570 1571 if (get_user(len, optlen)) 1572 return -EFAULT; 1573 1574 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1575 if (err >= 0) 1576 err = put_user(len, optlen); 1577 return err; 1578 } 1579 #endif 1580 return err; 1581 } 1582 EXPORT_SYMBOL(ip_getsockopt); 1583 1584 #ifdef CONFIG_COMPAT 1585 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1586 char __user *optval, int __user *optlen) 1587 { 1588 int err; 1589 1590 if (optname == MCAST_MSFILTER) 1591 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1592 ip_getsockopt); 1593 1594 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1595 MSG_CMSG_COMPAT); 1596 1597 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1598 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1599 optname < BPFILTER_IPT_GET_MAX) 1600 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1601 #endif 1602 #ifdef CONFIG_NETFILTER 1603 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1604 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1605 !ip_mroute_opt(optname)) { 1606 int len; 1607 1608 if (get_user(len, optlen)) 1609 return -EFAULT; 1610 1611 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1612 if (err >= 0) 1613 err = put_user(len, optlen); 1614 return err; 1615 } 1616 #endif 1617 return err; 1618 } 1619 EXPORT_SYMBOL(compat_ip_getsockopt); 1620 #endif 1621