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 if (on && !new_ra) 347 return -ENOMEM; 348 349 mutex_lock(&net->ipv4.ra_mutex); 350 for (rap = &net->ipv4.ra_chain; 351 (ra = rcu_dereference_protected(*rap, 352 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL; 353 rap = &ra->next) { 354 if (ra->sk == sk) { 355 if (on) { 356 mutex_unlock(&net->ipv4.ra_mutex); 357 kfree(new_ra); 358 return -EADDRINUSE; 359 } 360 /* dont let ip_call_ra_chain() use sk again */ 361 ra->sk = NULL; 362 RCU_INIT_POINTER(*rap, ra->next); 363 mutex_unlock(&net->ipv4.ra_mutex); 364 365 if (ra->destructor) 366 ra->destructor(sk); 367 /* 368 * Delay sock_put(sk) and kfree(ra) after one rcu grace 369 * period. This guarantee ip_call_ra_chain() dont need 370 * to mess with socket refcounts. 371 */ 372 ra->saved_sk = sk; 373 call_rcu(&ra->rcu, ip_ra_destroy_rcu); 374 return 0; 375 } 376 } 377 if (!new_ra) { 378 mutex_unlock(&net->ipv4.ra_mutex); 379 return -ENOBUFS; 380 } 381 new_ra->sk = sk; 382 new_ra->destructor = destructor; 383 384 RCU_INIT_POINTER(new_ra->next, ra); 385 rcu_assign_pointer(*rap, new_ra); 386 sock_hold(sk); 387 mutex_unlock(&net->ipv4.ra_mutex); 388 389 return 0; 390 } 391 392 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 393 __be16 port, u32 info, u8 *payload) 394 { 395 struct sock_exterr_skb *serr; 396 397 skb = skb_clone(skb, GFP_ATOMIC); 398 if (!skb) 399 return; 400 401 serr = SKB_EXT_ERR(skb); 402 serr->ee.ee_errno = err; 403 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP; 404 serr->ee.ee_type = icmp_hdr(skb)->type; 405 serr->ee.ee_code = icmp_hdr(skb)->code; 406 serr->ee.ee_pad = 0; 407 serr->ee.ee_info = info; 408 serr->ee.ee_data = 0; 409 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) - 410 skb_network_header(skb); 411 serr->port = port; 412 413 if (skb_pull(skb, payload - skb->data)) { 414 skb_reset_transport_header(skb); 415 if (sock_queue_err_skb(sk, skb) == 0) 416 return; 417 } 418 kfree_skb(skb); 419 } 420 421 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info) 422 { 423 struct inet_sock *inet = inet_sk(sk); 424 struct sock_exterr_skb *serr; 425 struct iphdr *iph; 426 struct sk_buff *skb; 427 428 if (!inet->recverr) 429 return; 430 431 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC); 432 if (!skb) 433 return; 434 435 skb_put(skb, sizeof(struct iphdr)); 436 skb_reset_network_header(skb); 437 iph = ip_hdr(skb); 438 iph->daddr = daddr; 439 440 serr = SKB_EXT_ERR(skb); 441 serr->ee.ee_errno = err; 442 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; 443 serr->ee.ee_type = 0; 444 serr->ee.ee_code = 0; 445 serr->ee.ee_pad = 0; 446 serr->ee.ee_info = info; 447 serr->ee.ee_data = 0; 448 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); 449 serr->port = port; 450 451 __skb_pull(skb, skb_tail_pointer(skb) - skb->data); 452 skb_reset_transport_header(skb); 453 454 if (sock_queue_err_skb(sk, skb)) 455 kfree_skb(skb); 456 } 457 458 /* For some errors we have valid addr_offset even with zero payload and 459 * zero port. Also, addr_offset should be supported if port is set. 460 */ 461 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr) 462 { 463 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || 464 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; 465 } 466 467 /* IPv4 supports cmsg on all imcp errors and some timestamps 468 * 469 * Timestamp code paths do not initialize the fields expected by cmsg: 470 * the PKTINFO fields in skb->cb[]. Fill those in here. 471 */ 472 static bool ipv4_datagram_support_cmsg(const struct sock *sk, 473 struct sk_buff *skb, 474 int ee_origin) 475 { 476 struct in_pktinfo *info; 477 478 if (ee_origin == SO_EE_ORIGIN_ICMP) 479 return true; 480 481 if (ee_origin == SO_EE_ORIGIN_LOCAL) 482 return false; 483 484 /* Support IP_PKTINFO on tstamp packets if requested, to correlate 485 * timestamp with egress dev. Not possible for packets without iif 486 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY). 487 */ 488 info = PKTINFO_SKB_CB(skb); 489 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) || 490 !info->ipi_ifindex) 491 return false; 492 493 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr; 494 return true; 495 } 496 497 /* 498 * Handle MSG_ERRQUEUE 499 */ 500 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) 501 { 502 struct sock_exterr_skb *serr; 503 struct sk_buff *skb; 504 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 505 struct { 506 struct sock_extended_err ee; 507 struct sockaddr_in offender; 508 } errhdr; 509 int err; 510 int copied; 511 512 err = -EAGAIN; 513 skb = sock_dequeue_err_skb(sk); 514 if (!skb) 515 goto out; 516 517 copied = skb->len; 518 if (copied > len) { 519 msg->msg_flags |= MSG_TRUNC; 520 copied = len; 521 } 522 err = skb_copy_datagram_msg(skb, 0, msg, copied); 523 if (unlikely(err)) { 524 kfree_skb(skb); 525 return err; 526 } 527 sock_recv_timestamp(msg, sk, skb); 528 529 serr = SKB_EXT_ERR(skb); 530 531 if (sin && ipv4_datagram_support_addr(serr)) { 532 sin->sin_family = AF_INET; 533 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) + 534 serr->addr_offset); 535 sin->sin_port = serr->port; 536 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 537 *addr_len = sizeof(*sin); 538 } 539 540 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); 541 sin = &errhdr.offender; 542 memset(sin, 0, sizeof(*sin)); 543 544 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) { 545 sin->sin_family = AF_INET; 546 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 547 if (inet_sk(sk)->cmsg_flags) 548 ip_cmsg_recv(msg, skb); 549 } 550 551 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr); 552 553 /* Now we could try to dump offended packet options */ 554 555 msg->msg_flags |= MSG_ERRQUEUE; 556 err = copied; 557 558 consume_skb(skb); 559 out: 560 return err; 561 } 562 563 564 /* 565 * Socket option code for IP. This is the end of the line after any 566 * TCP,UDP etc options on an IP socket. 567 */ 568 static bool setsockopt_needs_rtnl(int optname) 569 { 570 switch (optname) { 571 case IP_ADD_MEMBERSHIP: 572 case IP_ADD_SOURCE_MEMBERSHIP: 573 case IP_BLOCK_SOURCE: 574 case IP_DROP_MEMBERSHIP: 575 case IP_DROP_SOURCE_MEMBERSHIP: 576 case IP_MSFILTER: 577 case IP_UNBLOCK_SOURCE: 578 case MCAST_BLOCK_SOURCE: 579 case MCAST_MSFILTER: 580 case MCAST_JOIN_GROUP: 581 case MCAST_JOIN_SOURCE_GROUP: 582 case MCAST_LEAVE_GROUP: 583 case MCAST_LEAVE_SOURCE_GROUP: 584 case MCAST_UNBLOCK_SOURCE: 585 return true; 586 } 587 return false; 588 } 589 590 static int do_ip_setsockopt(struct sock *sk, int level, 591 int optname, char __user *optval, unsigned int optlen) 592 { 593 struct inet_sock *inet = inet_sk(sk); 594 struct net *net = sock_net(sk); 595 int val = 0, err; 596 bool needs_rtnl = setsockopt_needs_rtnl(optname); 597 598 switch (optname) { 599 case IP_PKTINFO: 600 case IP_RECVTTL: 601 case IP_RECVOPTS: 602 case IP_RECVTOS: 603 case IP_RETOPTS: 604 case IP_TOS: 605 case IP_TTL: 606 case IP_HDRINCL: 607 case IP_MTU_DISCOVER: 608 case IP_RECVERR: 609 case IP_ROUTER_ALERT: 610 case IP_FREEBIND: 611 case IP_PASSSEC: 612 case IP_TRANSPARENT: 613 case IP_MINTTL: 614 case IP_NODEFRAG: 615 case IP_BIND_ADDRESS_NO_PORT: 616 case IP_UNICAST_IF: 617 case IP_MULTICAST_TTL: 618 case IP_MULTICAST_ALL: 619 case IP_MULTICAST_LOOP: 620 case IP_RECVORIGDSTADDR: 621 case IP_CHECKSUM: 622 case IP_RECVFRAGSIZE: 623 if (optlen >= sizeof(int)) { 624 if (get_user(val, (int __user *) optval)) 625 return -EFAULT; 626 } else if (optlen >= sizeof(char)) { 627 unsigned char ucval; 628 629 if (get_user(ucval, (unsigned char __user *) optval)) 630 return -EFAULT; 631 val = (int) ucval; 632 } 633 } 634 635 /* If optlen==0, it is equivalent to val == 0 */ 636 637 if (optname == IP_ROUTER_ALERT) 638 return ip_ra_control(sk, val ? 1 : 0, NULL); 639 if (ip_mroute_opt(optname)) 640 return ip_mroute_setsockopt(sk, optname, optval, optlen); 641 642 err = 0; 643 if (needs_rtnl) 644 rtnl_lock(); 645 lock_sock(sk); 646 647 switch (optname) { 648 case IP_OPTIONS: 649 { 650 struct ip_options_rcu *old, *opt = NULL; 651 652 if (optlen > 40) 653 goto e_inval; 654 err = ip_options_get_from_user(sock_net(sk), &opt, 655 optval, optlen); 656 if (err) 657 break; 658 old = rcu_dereference_protected(inet->inet_opt, 659 lockdep_sock_is_held(sk)); 660 if (inet->is_icsk) { 661 struct inet_connection_sock *icsk = inet_csk(sk); 662 #if IS_ENABLED(CONFIG_IPV6) 663 if (sk->sk_family == PF_INET || 664 (!((1 << sk->sk_state) & 665 (TCPF_LISTEN | TCPF_CLOSE)) && 666 inet->inet_daddr != LOOPBACK4_IPV6)) { 667 #endif 668 if (old) 669 icsk->icsk_ext_hdr_len -= old->opt.optlen; 670 if (opt) 671 icsk->icsk_ext_hdr_len += opt->opt.optlen; 672 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie); 673 #if IS_ENABLED(CONFIG_IPV6) 674 } 675 #endif 676 } 677 rcu_assign_pointer(inet->inet_opt, opt); 678 if (old) 679 kfree_rcu(old, rcu); 680 break; 681 } 682 case IP_PKTINFO: 683 if (val) 684 inet->cmsg_flags |= IP_CMSG_PKTINFO; 685 else 686 inet->cmsg_flags &= ~IP_CMSG_PKTINFO; 687 break; 688 case IP_RECVTTL: 689 if (val) 690 inet->cmsg_flags |= IP_CMSG_TTL; 691 else 692 inet->cmsg_flags &= ~IP_CMSG_TTL; 693 break; 694 case IP_RECVTOS: 695 if (val) 696 inet->cmsg_flags |= IP_CMSG_TOS; 697 else 698 inet->cmsg_flags &= ~IP_CMSG_TOS; 699 break; 700 case IP_RECVOPTS: 701 if (val) 702 inet->cmsg_flags |= IP_CMSG_RECVOPTS; 703 else 704 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS; 705 break; 706 case IP_RETOPTS: 707 if (val) 708 inet->cmsg_flags |= IP_CMSG_RETOPTS; 709 else 710 inet->cmsg_flags &= ~IP_CMSG_RETOPTS; 711 break; 712 case IP_PASSSEC: 713 if (val) 714 inet->cmsg_flags |= IP_CMSG_PASSSEC; 715 else 716 inet->cmsg_flags &= ~IP_CMSG_PASSSEC; 717 break; 718 case IP_RECVORIGDSTADDR: 719 if (val) 720 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR; 721 else 722 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR; 723 break; 724 case IP_CHECKSUM: 725 if (val) { 726 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) { 727 inet_inc_convert_csum(sk); 728 inet->cmsg_flags |= IP_CMSG_CHECKSUM; 729 } 730 } else { 731 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) { 732 inet_dec_convert_csum(sk); 733 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM; 734 } 735 } 736 break; 737 case IP_RECVFRAGSIZE: 738 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM) 739 goto e_inval; 740 if (val) 741 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE; 742 else 743 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE; 744 break; 745 case IP_TOS: /* This sets both TOS and Precedence */ 746 if (sk->sk_type == SOCK_STREAM) { 747 val &= ~INET_ECN_MASK; 748 val |= inet->tos & INET_ECN_MASK; 749 } 750 if (inet->tos != val) { 751 inet->tos = val; 752 sk->sk_priority = rt_tos2priority(val); 753 sk_dst_reset(sk); 754 } 755 break; 756 case IP_TTL: 757 if (optlen < 1) 758 goto e_inval; 759 if (val != -1 && (val < 1 || val > 255)) 760 goto e_inval; 761 inet->uc_ttl = val; 762 break; 763 case IP_HDRINCL: 764 if (sk->sk_type != SOCK_RAW) { 765 err = -ENOPROTOOPT; 766 break; 767 } 768 inet->hdrincl = val ? 1 : 0; 769 break; 770 case IP_NODEFRAG: 771 if (sk->sk_type != SOCK_RAW) { 772 err = -ENOPROTOOPT; 773 break; 774 } 775 inet->nodefrag = val ? 1 : 0; 776 break; 777 case IP_BIND_ADDRESS_NO_PORT: 778 inet->bind_address_no_port = val ? 1 : 0; 779 break; 780 case IP_MTU_DISCOVER: 781 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) 782 goto e_inval; 783 inet->pmtudisc = val; 784 break; 785 case IP_RECVERR: 786 inet->recverr = !!val; 787 if (!val) 788 skb_queue_purge(&sk->sk_error_queue); 789 break; 790 case IP_MULTICAST_TTL: 791 if (sk->sk_type == SOCK_STREAM) 792 goto e_inval; 793 if (optlen < 1) 794 goto e_inval; 795 if (val == -1) 796 val = 1; 797 if (val < 0 || val > 255) 798 goto e_inval; 799 inet->mc_ttl = val; 800 break; 801 case IP_MULTICAST_LOOP: 802 if (optlen < 1) 803 goto e_inval; 804 inet->mc_loop = !!val; 805 break; 806 case IP_UNICAST_IF: 807 { 808 struct net_device *dev = NULL; 809 int ifindex; 810 int midx; 811 812 if (optlen != sizeof(int)) 813 goto e_inval; 814 815 ifindex = (__force int)ntohl((__force __be32)val); 816 if (ifindex == 0) { 817 inet->uc_index = 0; 818 err = 0; 819 break; 820 } 821 822 dev = dev_get_by_index(sock_net(sk), ifindex); 823 err = -EADDRNOTAVAIL; 824 if (!dev) 825 break; 826 827 midx = l3mdev_master_ifindex(dev); 828 dev_put(dev); 829 830 err = -EINVAL; 831 if (sk->sk_bound_dev_if && 832 (!midx || midx != sk->sk_bound_dev_if)) 833 break; 834 835 inet->uc_index = ifindex; 836 err = 0; 837 break; 838 } 839 case IP_MULTICAST_IF: 840 { 841 struct ip_mreqn mreq; 842 struct net_device *dev = NULL; 843 int midx; 844 845 if (sk->sk_type == SOCK_STREAM) 846 goto e_inval; 847 /* 848 * Check the arguments are allowable 849 */ 850 851 if (optlen < sizeof(struct in_addr)) 852 goto e_inval; 853 854 err = -EFAULT; 855 if (optlen >= sizeof(struct ip_mreqn)) { 856 if (copy_from_user(&mreq, optval, sizeof(mreq))) 857 break; 858 } else { 859 memset(&mreq, 0, sizeof(mreq)); 860 if (optlen >= sizeof(struct ip_mreq)) { 861 if (copy_from_user(&mreq, optval, 862 sizeof(struct ip_mreq))) 863 break; 864 } else if (optlen >= sizeof(struct in_addr)) { 865 if (copy_from_user(&mreq.imr_address, optval, 866 sizeof(struct in_addr))) 867 break; 868 } 869 } 870 871 if (!mreq.imr_ifindex) { 872 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) { 873 inet->mc_index = 0; 874 inet->mc_addr = 0; 875 err = 0; 876 break; 877 } 878 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr); 879 if (dev) 880 mreq.imr_ifindex = dev->ifindex; 881 } else 882 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex); 883 884 885 err = -EADDRNOTAVAIL; 886 if (!dev) 887 break; 888 889 midx = l3mdev_master_ifindex(dev); 890 891 dev_put(dev); 892 893 err = -EINVAL; 894 if (sk->sk_bound_dev_if && 895 mreq.imr_ifindex != sk->sk_bound_dev_if && 896 (!midx || midx != sk->sk_bound_dev_if)) 897 break; 898 899 inet->mc_index = mreq.imr_ifindex; 900 inet->mc_addr = mreq.imr_address.s_addr; 901 err = 0; 902 break; 903 } 904 905 case IP_ADD_MEMBERSHIP: 906 case IP_DROP_MEMBERSHIP: 907 { 908 struct ip_mreqn mreq; 909 910 err = -EPROTO; 911 if (inet_sk(sk)->is_icsk) 912 break; 913 914 if (optlen < sizeof(struct ip_mreq)) 915 goto e_inval; 916 err = -EFAULT; 917 if (optlen >= sizeof(struct ip_mreqn)) { 918 if (copy_from_user(&mreq, optval, sizeof(mreq))) 919 break; 920 } else { 921 memset(&mreq, 0, sizeof(mreq)); 922 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq))) 923 break; 924 } 925 926 if (optname == IP_ADD_MEMBERSHIP) 927 err = ip_mc_join_group(sk, &mreq); 928 else 929 err = ip_mc_leave_group(sk, &mreq); 930 break; 931 } 932 case IP_MSFILTER: 933 { 934 struct ip_msfilter *msf; 935 936 if (optlen < IP_MSFILTER_SIZE(0)) 937 goto e_inval; 938 if (optlen > sysctl_optmem_max) { 939 err = -ENOBUFS; 940 break; 941 } 942 msf = memdup_user(optval, optlen); 943 if (IS_ERR(msf)) { 944 err = PTR_ERR(msf); 945 break; 946 } 947 /* numsrc >= (1G-4) overflow in 32 bits */ 948 if (msf->imsf_numsrc >= 0x3ffffffcU || 949 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 950 kfree(msf); 951 err = -ENOBUFS; 952 break; 953 } 954 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) { 955 kfree(msf); 956 err = -EINVAL; 957 break; 958 } 959 err = ip_mc_msfilter(sk, msf, 0); 960 kfree(msf); 961 break; 962 } 963 case IP_BLOCK_SOURCE: 964 case IP_UNBLOCK_SOURCE: 965 case IP_ADD_SOURCE_MEMBERSHIP: 966 case IP_DROP_SOURCE_MEMBERSHIP: 967 { 968 struct ip_mreq_source mreqs; 969 int omode, add; 970 971 if (optlen != sizeof(struct ip_mreq_source)) 972 goto e_inval; 973 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) { 974 err = -EFAULT; 975 break; 976 } 977 if (optname == IP_BLOCK_SOURCE) { 978 omode = MCAST_EXCLUDE; 979 add = 1; 980 } else if (optname == IP_UNBLOCK_SOURCE) { 981 omode = MCAST_EXCLUDE; 982 add = 0; 983 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) { 984 struct ip_mreqn mreq; 985 986 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr; 987 mreq.imr_address.s_addr = mreqs.imr_interface; 988 mreq.imr_ifindex = 0; 989 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 990 if (err && err != -EADDRINUSE) 991 break; 992 omode = MCAST_INCLUDE; 993 add = 1; 994 } else /* IP_DROP_SOURCE_MEMBERSHIP */ { 995 omode = MCAST_INCLUDE; 996 add = 0; 997 } 998 err = ip_mc_source(add, omode, sk, &mreqs, 0); 999 break; 1000 } 1001 case MCAST_JOIN_GROUP: 1002 case MCAST_LEAVE_GROUP: 1003 { 1004 struct group_req greq; 1005 struct sockaddr_in *psin; 1006 struct ip_mreqn mreq; 1007 1008 if (optlen < sizeof(struct group_req)) 1009 goto e_inval; 1010 err = -EFAULT; 1011 if (copy_from_user(&greq, optval, sizeof(greq))) 1012 break; 1013 psin = (struct sockaddr_in *)&greq.gr_group; 1014 if (psin->sin_family != AF_INET) 1015 goto e_inval; 1016 memset(&mreq, 0, sizeof(mreq)); 1017 mreq.imr_multiaddr = psin->sin_addr; 1018 mreq.imr_ifindex = greq.gr_interface; 1019 1020 if (optname == MCAST_JOIN_GROUP) 1021 err = ip_mc_join_group(sk, &mreq); 1022 else 1023 err = ip_mc_leave_group(sk, &mreq); 1024 break; 1025 } 1026 case MCAST_JOIN_SOURCE_GROUP: 1027 case MCAST_LEAVE_SOURCE_GROUP: 1028 case MCAST_BLOCK_SOURCE: 1029 case MCAST_UNBLOCK_SOURCE: 1030 { 1031 struct group_source_req greqs; 1032 struct ip_mreq_source mreqs; 1033 struct sockaddr_in *psin; 1034 int omode, add; 1035 1036 if (optlen != sizeof(struct group_source_req)) 1037 goto e_inval; 1038 if (copy_from_user(&greqs, optval, sizeof(greqs))) { 1039 err = -EFAULT; 1040 break; 1041 } 1042 if (greqs.gsr_group.ss_family != AF_INET || 1043 greqs.gsr_source.ss_family != AF_INET) { 1044 err = -EADDRNOTAVAIL; 1045 break; 1046 } 1047 psin = (struct sockaddr_in *)&greqs.gsr_group; 1048 mreqs.imr_multiaddr = psin->sin_addr.s_addr; 1049 psin = (struct sockaddr_in *)&greqs.gsr_source; 1050 mreqs.imr_sourceaddr = psin->sin_addr.s_addr; 1051 mreqs.imr_interface = 0; /* use index for mc_source */ 1052 1053 if (optname == MCAST_BLOCK_SOURCE) { 1054 omode = MCAST_EXCLUDE; 1055 add = 1; 1056 } else if (optname == MCAST_UNBLOCK_SOURCE) { 1057 omode = MCAST_EXCLUDE; 1058 add = 0; 1059 } else if (optname == MCAST_JOIN_SOURCE_GROUP) { 1060 struct ip_mreqn mreq; 1061 1062 psin = (struct sockaddr_in *)&greqs.gsr_group; 1063 mreq.imr_multiaddr = psin->sin_addr; 1064 mreq.imr_address.s_addr = 0; 1065 mreq.imr_ifindex = greqs.gsr_interface; 1066 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE); 1067 if (err && err != -EADDRINUSE) 1068 break; 1069 greqs.gsr_interface = mreq.imr_ifindex; 1070 omode = MCAST_INCLUDE; 1071 add = 1; 1072 } else /* MCAST_LEAVE_SOURCE_GROUP */ { 1073 omode = MCAST_INCLUDE; 1074 add = 0; 1075 } 1076 err = ip_mc_source(add, omode, sk, &mreqs, 1077 greqs.gsr_interface); 1078 break; 1079 } 1080 case MCAST_MSFILTER: 1081 { 1082 struct sockaddr_in *psin; 1083 struct ip_msfilter *msf = NULL; 1084 struct group_filter *gsf = NULL; 1085 int msize, i, ifindex; 1086 1087 if (optlen < GROUP_FILTER_SIZE(0)) 1088 goto e_inval; 1089 if (optlen > sysctl_optmem_max) { 1090 err = -ENOBUFS; 1091 break; 1092 } 1093 gsf = memdup_user(optval, optlen); 1094 if (IS_ERR(gsf)) { 1095 err = PTR_ERR(gsf); 1096 break; 1097 } 1098 1099 /* numsrc >= (4G-140)/128 overflow in 32 bits */ 1100 if (gsf->gf_numsrc >= 0x1ffffff || 1101 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) { 1102 err = -ENOBUFS; 1103 goto mc_msf_out; 1104 } 1105 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) { 1106 err = -EINVAL; 1107 goto mc_msf_out; 1108 } 1109 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc); 1110 msf = kmalloc(msize, GFP_KERNEL); 1111 if (!msf) { 1112 err = -ENOBUFS; 1113 goto mc_msf_out; 1114 } 1115 ifindex = gsf->gf_interface; 1116 psin = (struct sockaddr_in *)&gsf->gf_group; 1117 if (psin->sin_family != AF_INET) { 1118 err = -EADDRNOTAVAIL; 1119 goto mc_msf_out; 1120 } 1121 msf->imsf_multiaddr = psin->sin_addr.s_addr; 1122 msf->imsf_interface = 0; 1123 msf->imsf_fmode = gsf->gf_fmode; 1124 msf->imsf_numsrc = gsf->gf_numsrc; 1125 err = -EADDRNOTAVAIL; 1126 for (i = 0; i < gsf->gf_numsrc; ++i) { 1127 psin = (struct sockaddr_in *)&gsf->gf_slist[i]; 1128 1129 if (psin->sin_family != AF_INET) 1130 goto mc_msf_out; 1131 msf->imsf_slist[i] = psin->sin_addr.s_addr; 1132 } 1133 kfree(gsf); 1134 gsf = NULL; 1135 1136 err = ip_mc_msfilter(sk, msf, ifindex); 1137 mc_msf_out: 1138 kfree(msf); 1139 kfree(gsf); 1140 break; 1141 } 1142 case IP_MULTICAST_ALL: 1143 if (optlen < 1) 1144 goto e_inval; 1145 if (val != 0 && val != 1) 1146 goto e_inval; 1147 inet->mc_all = val; 1148 break; 1149 1150 case IP_FREEBIND: 1151 if (optlen < 1) 1152 goto e_inval; 1153 inet->freebind = !!val; 1154 break; 1155 1156 case IP_IPSEC_POLICY: 1157 case IP_XFRM_POLICY: 1158 err = -EPERM; 1159 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 1160 break; 1161 err = xfrm_user_policy(sk, optname, optval, optlen); 1162 break; 1163 1164 case IP_TRANSPARENT: 1165 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) && 1166 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1167 err = -EPERM; 1168 break; 1169 } 1170 if (optlen < 1) 1171 goto e_inval; 1172 inet->transparent = !!val; 1173 break; 1174 1175 case IP_MINTTL: 1176 if (optlen < 1) 1177 goto e_inval; 1178 if (val < 0 || val > 255) 1179 goto e_inval; 1180 inet->min_ttl = val; 1181 break; 1182 1183 default: 1184 err = -ENOPROTOOPT; 1185 break; 1186 } 1187 release_sock(sk); 1188 if (needs_rtnl) 1189 rtnl_unlock(); 1190 return err; 1191 1192 e_inval: 1193 release_sock(sk); 1194 if (needs_rtnl) 1195 rtnl_unlock(); 1196 return -EINVAL; 1197 } 1198 1199 /** 1200 * ipv4_pktinfo_prepare - transfer some info from rtable to skb 1201 * @sk: socket 1202 * @skb: buffer 1203 * 1204 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific 1205 * destination in skb->cb[] before dst drop. 1206 * This way, receiver doesn't make cache line misses to read rtable. 1207 */ 1208 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) 1209 { 1210 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); 1211 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || 1212 ipv6_sk_rxinfo(sk); 1213 1214 if (prepare && skb_rtable(skb)) { 1215 /* skb->cb is overloaded: prior to this point it is IP{6}CB 1216 * which has interface index (iif) as the first member of the 1217 * underlying inet{6}_skb_parm struct. This code then overlays 1218 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first 1219 * element so the iif is picked up from the prior IPCB. If iif 1220 * is the loopback interface, then return the sending interface 1221 * (e.g., process binds socket to eth0 for Tx which is 1222 * redirected to loopback in the rtable/dst). 1223 */ 1224 struct rtable *rt = skb_rtable(skb); 1225 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags); 1226 1227 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX) 1228 pktinfo->ipi_ifindex = inet_iif(skb); 1229 else if (l3slave && rt && rt->rt_iif) 1230 pktinfo->ipi_ifindex = rt->rt_iif; 1231 1232 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); 1233 } else { 1234 pktinfo->ipi_ifindex = 0; 1235 pktinfo->ipi_spec_dst.s_addr = 0; 1236 } 1237 skb_dst_drop(skb); 1238 } 1239 1240 int ip_setsockopt(struct sock *sk, int level, 1241 int optname, char __user *optval, unsigned int optlen) 1242 { 1243 int err; 1244 1245 if (level != SOL_IP) 1246 return -ENOPROTOOPT; 1247 1248 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1249 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1250 if (optname >= BPFILTER_IPT_SO_SET_REPLACE && 1251 optname < BPFILTER_IPT_SET_MAX) 1252 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen); 1253 #endif 1254 #ifdef CONFIG_NETFILTER 1255 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1256 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1257 optname != IP_IPSEC_POLICY && 1258 optname != IP_XFRM_POLICY && 1259 !ip_mroute_opt(optname)) 1260 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen); 1261 #endif 1262 return err; 1263 } 1264 EXPORT_SYMBOL(ip_setsockopt); 1265 1266 #ifdef CONFIG_COMPAT 1267 int compat_ip_setsockopt(struct sock *sk, int level, int optname, 1268 char __user *optval, unsigned int optlen) 1269 { 1270 int err; 1271 1272 if (level != SOL_IP) 1273 return -ENOPROTOOPT; 1274 1275 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER) 1276 return compat_mc_setsockopt(sk, level, optname, optval, optlen, 1277 ip_setsockopt); 1278 1279 err = do_ip_setsockopt(sk, level, optname, optval, optlen); 1280 #ifdef CONFIG_NETFILTER 1281 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1282 if (err == -ENOPROTOOPT && optname != IP_HDRINCL && 1283 optname != IP_IPSEC_POLICY && 1284 optname != IP_XFRM_POLICY && 1285 !ip_mroute_opt(optname)) 1286 err = compat_nf_setsockopt(sk, PF_INET, optname, optval, 1287 optlen); 1288 #endif 1289 return err; 1290 } 1291 EXPORT_SYMBOL(compat_ip_setsockopt); 1292 #endif 1293 1294 /* 1295 * Get the options. Note for future reference. The GET of IP options gets 1296 * the _received_ ones. The set sets the _sent_ ones. 1297 */ 1298 1299 static bool getsockopt_needs_rtnl(int optname) 1300 { 1301 switch (optname) { 1302 case IP_MSFILTER: 1303 case MCAST_MSFILTER: 1304 return true; 1305 } 1306 return false; 1307 } 1308 1309 static int do_ip_getsockopt(struct sock *sk, int level, int optname, 1310 char __user *optval, int __user *optlen, unsigned int flags) 1311 { 1312 struct inet_sock *inet = inet_sk(sk); 1313 bool needs_rtnl = getsockopt_needs_rtnl(optname); 1314 int val, err = 0; 1315 int len; 1316 1317 if (level != SOL_IP) 1318 return -EOPNOTSUPP; 1319 1320 if (ip_mroute_opt(optname)) 1321 return ip_mroute_getsockopt(sk, optname, optval, optlen); 1322 1323 if (get_user(len, optlen)) 1324 return -EFAULT; 1325 if (len < 0) 1326 return -EINVAL; 1327 1328 if (needs_rtnl) 1329 rtnl_lock(); 1330 lock_sock(sk); 1331 1332 switch (optname) { 1333 case IP_OPTIONS: 1334 { 1335 unsigned char optbuf[sizeof(struct ip_options)+40]; 1336 struct ip_options *opt = (struct ip_options *)optbuf; 1337 struct ip_options_rcu *inet_opt; 1338 1339 inet_opt = rcu_dereference_protected(inet->inet_opt, 1340 lockdep_sock_is_held(sk)); 1341 opt->optlen = 0; 1342 if (inet_opt) 1343 memcpy(optbuf, &inet_opt->opt, 1344 sizeof(struct ip_options) + 1345 inet_opt->opt.optlen); 1346 release_sock(sk); 1347 1348 if (opt->optlen == 0) 1349 return put_user(0, optlen); 1350 1351 ip_options_undo(opt); 1352 1353 len = min_t(unsigned int, len, opt->optlen); 1354 if (put_user(len, optlen)) 1355 return -EFAULT; 1356 if (copy_to_user(optval, opt->__data, len)) 1357 return -EFAULT; 1358 return 0; 1359 } 1360 case IP_PKTINFO: 1361 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0; 1362 break; 1363 case IP_RECVTTL: 1364 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0; 1365 break; 1366 case IP_RECVTOS: 1367 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0; 1368 break; 1369 case IP_RECVOPTS: 1370 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0; 1371 break; 1372 case IP_RETOPTS: 1373 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0; 1374 break; 1375 case IP_PASSSEC: 1376 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0; 1377 break; 1378 case IP_RECVORIGDSTADDR: 1379 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0; 1380 break; 1381 case IP_CHECKSUM: 1382 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0; 1383 break; 1384 case IP_RECVFRAGSIZE: 1385 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0; 1386 break; 1387 case IP_TOS: 1388 val = inet->tos; 1389 break; 1390 case IP_TTL: 1391 { 1392 struct net *net = sock_net(sk); 1393 val = (inet->uc_ttl == -1 ? 1394 net->ipv4.sysctl_ip_default_ttl : 1395 inet->uc_ttl); 1396 break; 1397 } 1398 case IP_HDRINCL: 1399 val = inet->hdrincl; 1400 break; 1401 case IP_NODEFRAG: 1402 val = inet->nodefrag; 1403 break; 1404 case IP_BIND_ADDRESS_NO_PORT: 1405 val = inet->bind_address_no_port; 1406 break; 1407 case IP_MTU_DISCOVER: 1408 val = inet->pmtudisc; 1409 break; 1410 case IP_MTU: 1411 { 1412 struct dst_entry *dst; 1413 val = 0; 1414 dst = sk_dst_get(sk); 1415 if (dst) { 1416 val = dst_mtu(dst); 1417 dst_release(dst); 1418 } 1419 if (!val) { 1420 release_sock(sk); 1421 return -ENOTCONN; 1422 } 1423 break; 1424 } 1425 case IP_RECVERR: 1426 val = inet->recverr; 1427 break; 1428 case IP_MULTICAST_TTL: 1429 val = inet->mc_ttl; 1430 break; 1431 case IP_MULTICAST_LOOP: 1432 val = inet->mc_loop; 1433 break; 1434 case IP_UNICAST_IF: 1435 val = (__force int)htonl((__u32) inet->uc_index); 1436 break; 1437 case IP_MULTICAST_IF: 1438 { 1439 struct in_addr addr; 1440 len = min_t(unsigned int, len, sizeof(struct in_addr)); 1441 addr.s_addr = inet->mc_addr; 1442 release_sock(sk); 1443 1444 if (put_user(len, optlen)) 1445 return -EFAULT; 1446 if (copy_to_user(optval, &addr, len)) 1447 return -EFAULT; 1448 return 0; 1449 } 1450 case IP_MSFILTER: 1451 { 1452 struct ip_msfilter msf; 1453 1454 if (len < IP_MSFILTER_SIZE(0)) { 1455 err = -EINVAL; 1456 goto out; 1457 } 1458 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) { 1459 err = -EFAULT; 1460 goto out; 1461 } 1462 err = ip_mc_msfget(sk, &msf, 1463 (struct ip_msfilter __user *)optval, optlen); 1464 goto out; 1465 } 1466 case MCAST_MSFILTER: 1467 { 1468 struct group_filter gsf; 1469 1470 if (len < GROUP_FILTER_SIZE(0)) { 1471 err = -EINVAL; 1472 goto out; 1473 } 1474 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) { 1475 err = -EFAULT; 1476 goto out; 1477 } 1478 err = ip_mc_gsfget(sk, &gsf, 1479 (struct group_filter __user *)optval, 1480 optlen); 1481 goto out; 1482 } 1483 case IP_MULTICAST_ALL: 1484 val = inet->mc_all; 1485 break; 1486 case IP_PKTOPTIONS: 1487 { 1488 struct msghdr msg; 1489 1490 release_sock(sk); 1491 1492 if (sk->sk_type != SOCK_STREAM) 1493 return -ENOPROTOOPT; 1494 1495 msg.msg_control = (__force void *) optval; 1496 msg.msg_controllen = len; 1497 msg.msg_flags = flags; 1498 1499 if (inet->cmsg_flags & IP_CMSG_PKTINFO) { 1500 struct in_pktinfo info; 1501 1502 info.ipi_addr.s_addr = inet->inet_rcv_saddr; 1503 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr; 1504 info.ipi_ifindex = inet->mc_index; 1505 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); 1506 } 1507 if (inet->cmsg_flags & IP_CMSG_TTL) { 1508 int hlim = inet->mc_ttl; 1509 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); 1510 } 1511 if (inet->cmsg_flags & IP_CMSG_TOS) { 1512 int tos = inet->rcv_tos; 1513 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos); 1514 } 1515 len -= msg.msg_controllen; 1516 return put_user(len, optlen); 1517 } 1518 case IP_FREEBIND: 1519 val = inet->freebind; 1520 break; 1521 case IP_TRANSPARENT: 1522 val = inet->transparent; 1523 break; 1524 case IP_MINTTL: 1525 val = inet->min_ttl; 1526 break; 1527 default: 1528 release_sock(sk); 1529 return -ENOPROTOOPT; 1530 } 1531 release_sock(sk); 1532 1533 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) { 1534 unsigned char ucval = (unsigned char)val; 1535 len = 1; 1536 if (put_user(len, optlen)) 1537 return -EFAULT; 1538 if (copy_to_user(optval, &ucval, 1)) 1539 return -EFAULT; 1540 } else { 1541 len = min_t(unsigned int, sizeof(int), len); 1542 if (put_user(len, optlen)) 1543 return -EFAULT; 1544 if (copy_to_user(optval, &val, len)) 1545 return -EFAULT; 1546 } 1547 return 0; 1548 1549 out: 1550 release_sock(sk); 1551 if (needs_rtnl) 1552 rtnl_unlock(); 1553 return err; 1554 } 1555 1556 int ip_getsockopt(struct sock *sk, int level, 1557 int optname, char __user *optval, int __user *optlen) 1558 { 1559 int err; 1560 1561 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0); 1562 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1563 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1564 optname < BPFILTER_IPT_GET_MAX) 1565 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1566 #endif 1567 #ifdef CONFIG_NETFILTER 1568 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1569 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1570 !ip_mroute_opt(optname)) { 1571 int len; 1572 1573 if (get_user(len, optlen)) 1574 return -EFAULT; 1575 1576 err = nf_getsockopt(sk, PF_INET, optname, optval, &len); 1577 if (err >= 0) 1578 err = put_user(len, optlen); 1579 return err; 1580 } 1581 #endif 1582 return err; 1583 } 1584 EXPORT_SYMBOL(ip_getsockopt); 1585 1586 #ifdef CONFIG_COMPAT 1587 int compat_ip_getsockopt(struct sock *sk, int level, int optname, 1588 char __user *optval, int __user *optlen) 1589 { 1590 int err; 1591 1592 if (optname == MCAST_MSFILTER) 1593 return compat_mc_getsockopt(sk, level, optname, optval, optlen, 1594 ip_getsockopt); 1595 1596 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 1597 MSG_CMSG_COMPAT); 1598 1599 #if IS_ENABLED(CONFIG_BPFILTER_UMH) 1600 if (optname >= BPFILTER_IPT_SO_GET_INFO && 1601 optname < BPFILTER_IPT_GET_MAX) 1602 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen); 1603 #endif 1604 #ifdef CONFIG_NETFILTER 1605 /* we need to exclude all possible ENOPROTOOPTs except default case */ 1606 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS && 1607 !ip_mroute_opt(optname)) { 1608 int len; 1609 1610 if (get_user(len, optlen)) 1611 return -EFAULT; 1612 1613 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len); 1614 if (err >= 0) 1615 err = put_user(len, optlen); 1616 return err; 1617 } 1618 #endif 1619 return err; 1620 } 1621 EXPORT_SYMBOL(compat_ip_getsockopt); 1622 #endif 1623