1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1995 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 /* XXX we use functions that might not exist. */ 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/proc.h> 38 #include <sys/systm.h> 39 #include <sys/sysproto.h> 40 #include <sys/capsicum.h> 41 #include <sys/fcntl.h> 42 #include <sys/file.h> 43 #include <sys/filedesc.h> 44 #include <sys/limits.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mutex.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/syscallsubr.h> 52 #include <sys/uio.h> 53 #include <sys/stat.h> 54 #include <sys/syslog.h> 55 #include <sys/un.h> 56 #include <sys/unistd.h> 57 58 #include <security/audit/audit.h> 59 60 #include <net/if.h> 61 #include <net/vnet.h> 62 #include <netinet/in.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #include <netinet/tcp.h> 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #include <netinet6/ip6_var.h> 69 #endif 70 71 #ifdef COMPAT_LINUX32 72 #include <machine/../linux32/linux.h> 73 #include <machine/../linux32/linux32_proto.h> 74 #else 75 #include <machine/../linux/linux.h> 76 #include <machine/../linux/linux_proto.h> 77 #endif 78 #include <compat/linux/linux_common.h> 79 #include <compat/linux/linux_file.h> 80 #include <compat/linux/linux_mib.h> 81 #include <compat/linux/linux_socket.h> 82 #include <compat/linux/linux_timer.h> 83 #include <compat/linux/linux_util.h> 84 85 static int linux_sendmsg_common(struct thread *, l_int, struct l_msghdr *, 86 l_uint); 87 static int linux_recvmsg_common(struct thread *, l_int, struct l_msghdr *, 88 l_uint, struct msghdr *); 89 static int linux_set_socket_flags(int, int *); 90 91 static int 92 linux_to_bsd_sockopt_level(int level) 93 { 94 95 if (level == LINUX_SOL_SOCKET) 96 return (SOL_SOCKET); 97 /* Remaining values are RFC-defined protocol numbers. */ 98 return (level); 99 } 100 101 static int 102 bsd_to_linux_sockopt_level(int level) 103 { 104 105 if (level == SOL_SOCKET) 106 return (LINUX_SOL_SOCKET); 107 return (level); 108 } 109 110 static int 111 linux_to_bsd_ip_sockopt(int opt) 112 { 113 114 switch (opt) { 115 case LINUX_IP_TOS: 116 return (IP_TOS); 117 case LINUX_IP_TTL: 118 return (IP_TTL); 119 case LINUX_IP_OPTIONS: 120 return (IP_OPTIONS); 121 case LINUX_IP_MULTICAST_IF: 122 return (IP_MULTICAST_IF); 123 case LINUX_IP_MULTICAST_TTL: 124 return (IP_MULTICAST_TTL); 125 case LINUX_IP_MULTICAST_LOOP: 126 return (IP_MULTICAST_LOOP); 127 case LINUX_IP_ADD_MEMBERSHIP: 128 return (IP_ADD_MEMBERSHIP); 129 case LINUX_IP_DROP_MEMBERSHIP: 130 return (IP_DROP_MEMBERSHIP); 131 case LINUX_IP_HDRINCL: 132 return (IP_HDRINCL); 133 } 134 return (-1); 135 } 136 137 static int 138 linux_to_bsd_ip6_sockopt(int opt) 139 { 140 141 switch (opt) { 142 case LINUX_IPV6_NEXTHOP: 143 return (IPV6_NEXTHOP); 144 case LINUX_IPV6_UNICAST_HOPS: 145 return (IPV6_UNICAST_HOPS); 146 case LINUX_IPV6_MULTICAST_IF: 147 return (IPV6_MULTICAST_IF); 148 case LINUX_IPV6_MULTICAST_HOPS: 149 return (IPV6_MULTICAST_HOPS); 150 case LINUX_IPV6_MULTICAST_LOOP: 151 return (IPV6_MULTICAST_LOOP); 152 case LINUX_IPV6_ADD_MEMBERSHIP: 153 return (IPV6_JOIN_GROUP); 154 case LINUX_IPV6_DROP_MEMBERSHIP: 155 return (IPV6_LEAVE_GROUP); 156 case LINUX_IPV6_V6ONLY: 157 return (IPV6_V6ONLY); 158 case LINUX_IPV6_DONTFRAG: 159 return (IPV6_DONTFRAG); 160 #if 0 161 case LINUX_IPV6_CHECKSUM: 162 return (IPV6_CHECKSUM); 163 case LINUX_IPV6_RECVPKTINFO: 164 return (IPV6_RECVPKTINFO); 165 case LINUX_IPV6_PKTINFO: 166 return (IPV6_PKTINFO); 167 case LINUX_IPV6_RECVHOPLIMIT: 168 return (IPV6_RECVHOPLIMIT); 169 case LINUX_IPV6_HOPLIMIT: 170 return (IPV6_HOPLIMIT); 171 case LINUX_IPV6_RECVHOPOPTS: 172 return (IPV6_RECVHOPOPTS); 173 case LINUX_IPV6_HOPOPTS: 174 return (IPV6_HOPOPTS); 175 case LINUX_IPV6_RTHDRDSTOPTS: 176 return (IPV6_RTHDRDSTOPTS); 177 case LINUX_IPV6_RECVRTHDR: 178 return (IPV6_RECVRTHDR); 179 case LINUX_IPV6_RTHDR: 180 return (IPV6_RTHDR); 181 case LINUX_IPV6_RECVDSTOPTS: 182 return (IPV6_RECVDSTOPTS); 183 case LINUX_IPV6_DSTOPTS: 184 return (IPV6_DSTOPTS); 185 case LINUX_IPV6_RECVPATHMTU: 186 return (IPV6_RECVPATHMTU); 187 case LINUX_IPV6_PATHMTU: 188 return (IPV6_PATHMTU); 189 #endif 190 } 191 return (-1); 192 } 193 194 static int 195 linux_to_bsd_so_sockopt(int opt) 196 { 197 198 switch (opt) { 199 case LINUX_SO_DEBUG: 200 return (SO_DEBUG); 201 case LINUX_SO_REUSEADDR: 202 return (SO_REUSEADDR); 203 case LINUX_SO_TYPE: 204 return (SO_TYPE); 205 case LINUX_SO_ERROR: 206 return (SO_ERROR); 207 case LINUX_SO_DONTROUTE: 208 return (SO_DONTROUTE); 209 case LINUX_SO_BROADCAST: 210 return (SO_BROADCAST); 211 case LINUX_SO_SNDBUF: 212 case LINUX_SO_SNDBUFFORCE: 213 return (SO_SNDBUF); 214 case LINUX_SO_RCVBUF: 215 case LINUX_SO_RCVBUFFORCE: 216 return (SO_RCVBUF); 217 case LINUX_SO_KEEPALIVE: 218 return (SO_KEEPALIVE); 219 case LINUX_SO_OOBINLINE: 220 return (SO_OOBINLINE); 221 case LINUX_SO_LINGER: 222 return (SO_LINGER); 223 case LINUX_SO_REUSEPORT: 224 return (SO_REUSEPORT_LB); 225 case LINUX_SO_PEERCRED: 226 return (LOCAL_PEERCRED); 227 case LINUX_SO_RCVLOWAT: 228 return (SO_RCVLOWAT); 229 case LINUX_SO_SNDLOWAT: 230 return (SO_SNDLOWAT); 231 case LINUX_SO_RCVTIMEO: 232 return (SO_RCVTIMEO); 233 case LINUX_SO_SNDTIMEO: 234 return (SO_SNDTIMEO); 235 case LINUX_SO_TIMESTAMP: 236 return (SO_TIMESTAMP); 237 case LINUX_SO_ACCEPTCONN: 238 return (SO_ACCEPTCONN); 239 case LINUX_SO_PROTOCOL: 240 return (SO_PROTOCOL); 241 } 242 return (-1); 243 } 244 245 static int 246 linux_to_bsd_tcp_sockopt(int opt) 247 { 248 249 switch (opt) { 250 case LINUX_TCP_NODELAY: 251 return (TCP_NODELAY); 252 case LINUX_TCP_MAXSEG: 253 return (TCP_MAXSEG); 254 case LINUX_TCP_CORK: 255 return (TCP_NOPUSH); 256 case LINUX_TCP_KEEPIDLE: 257 return (TCP_KEEPIDLE); 258 case LINUX_TCP_KEEPINTVL: 259 return (TCP_KEEPINTVL); 260 case LINUX_TCP_KEEPCNT: 261 return (TCP_KEEPCNT); 262 case LINUX_TCP_MD5SIG: 263 return (TCP_MD5SIG); 264 } 265 return (-1); 266 } 267 268 static int 269 linux_to_bsd_msg_flags(int flags) 270 { 271 int ret_flags = 0; 272 273 if (flags & LINUX_MSG_OOB) 274 ret_flags |= MSG_OOB; 275 if (flags & LINUX_MSG_PEEK) 276 ret_flags |= MSG_PEEK; 277 if (flags & LINUX_MSG_DONTROUTE) 278 ret_flags |= MSG_DONTROUTE; 279 if (flags & LINUX_MSG_CTRUNC) 280 ret_flags |= MSG_CTRUNC; 281 if (flags & LINUX_MSG_TRUNC) 282 ret_flags |= MSG_TRUNC; 283 if (flags & LINUX_MSG_DONTWAIT) 284 ret_flags |= MSG_DONTWAIT; 285 if (flags & LINUX_MSG_EOR) 286 ret_flags |= MSG_EOR; 287 if (flags & LINUX_MSG_WAITALL) 288 ret_flags |= MSG_WAITALL; 289 if (flags & LINUX_MSG_NOSIGNAL) 290 ret_flags |= MSG_NOSIGNAL; 291 #if 0 /* not handled */ 292 if (flags & LINUX_MSG_PROXY) 293 ; 294 if (flags & LINUX_MSG_FIN) 295 ; 296 if (flags & LINUX_MSG_SYN) 297 ; 298 if (flags & LINUX_MSG_CONFIRM) 299 ; 300 if (flags & LINUX_MSG_RST) 301 ; 302 if (flags & LINUX_MSG_ERRQUEUE) 303 ; 304 #endif 305 return (ret_flags); 306 } 307 308 static int 309 linux_to_bsd_cmsg_type(int cmsg_type) 310 { 311 312 switch (cmsg_type) { 313 case LINUX_SCM_RIGHTS: 314 return (SCM_RIGHTS); 315 case LINUX_SCM_CREDENTIALS: 316 return (SCM_CREDS); 317 } 318 return (-1); 319 } 320 321 static int 322 bsd_to_linux_cmsg_type(int cmsg_type) 323 { 324 325 switch (cmsg_type) { 326 case SCM_RIGHTS: 327 return (LINUX_SCM_RIGHTS); 328 case SCM_CREDS: 329 return (LINUX_SCM_CREDENTIALS); 330 case SCM_TIMESTAMP: 331 return (LINUX_SCM_TIMESTAMP); 332 } 333 return (-1); 334 } 335 336 static int 337 linux_to_bsd_msghdr(struct msghdr *bhdr, const struct l_msghdr *lhdr) 338 { 339 if (lhdr->msg_controllen > INT_MAX) 340 return (ENOBUFS); 341 342 bhdr->msg_name = PTRIN(lhdr->msg_name); 343 bhdr->msg_namelen = lhdr->msg_namelen; 344 bhdr->msg_iov = PTRIN(lhdr->msg_iov); 345 bhdr->msg_iovlen = lhdr->msg_iovlen; 346 bhdr->msg_control = PTRIN(lhdr->msg_control); 347 348 /* 349 * msg_controllen is skipped since BSD and LINUX control messages 350 * are potentially different sizes (e.g. the cred structure used 351 * by SCM_CREDS is different between the two operating system). 352 * 353 * The caller can set it (if necessary) after converting all the 354 * control messages. 355 */ 356 357 bhdr->msg_flags = linux_to_bsd_msg_flags(lhdr->msg_flags); 358 return (0); 359 } 360 361 static int 362 bsd_to_linux_msghdr(const struct msghdr *bhdr, struct l_msghdr *lhdr) 363 { 364 lhdr->msg_name = PTROUT(bhdr->msg_name); 365 lhdr->msg_namelen = bhdr->msg_namelen; 366 lhdr->msg_iov = PTROUT(bhdr->msg_iov); 367 lhdr->msg_iovlen = bhdr->msg_iovlen; 368 lhdr->msg_control = PTROUT(bhdr->msg_control); 369 370 /* 371 * msg_controllen is skipped since BSD and LINUX control messages 372 * are potentially different sizes (e.g. the cred structure used 373 * by SCM_CREDS is different between the two operating system). 374 * 375 * The caller can set it (if necessary) after converting all the 376 * control messages. 377 */ 378 379 /* msg_flags skipped */ 380 return (0); 381 } 382 383 static int 384 linux_set_socket_flags(int lflags, int *flags) 385 { 386 387 if (lflags & ~(LINUX_SOCK_CLOEXEC | LINUX_SOCK_NONBLOCK)) 388 return (EINVAL); 389 if (lflags & LINUX_SOCK_NONBLOCK) 390 *flags |= SOCK_NONBLOCK; 391 if (lflags & LINUX_SOCK_CLOEXEC) 392 *flags |= SOCK_CLOEXEC; 393 return (0); 394 } 395 396 static int 397 linux_copyout_sockaddr(const struct sockaddr *sa, void *uaddr, size_t len) 398 { 399 struct l_sockaddr *lsa; 400 int error; 401 402 error = bsd_to_linux_sockaddr(sa, &lsa, len); 403 if (error != 0) 404 return (error); 405 406 error = copyout(lsa, uaddr, len); 407 free(lsa, M_SONAME); 408 409 return (error); 410 } 411 412 static int 413 linux_sendit(struct thread *td, int s, struct msghdr *mp, int flags, 414 struct mbuf *control, enum uio_seg segflg) 415 { 416 struct sockaddr *to; 417 int error, len; 418 419 if (mp->msg_name != NULL) { 420 len = mp->msg_namelen; 421 error = linux_to_bsd_sockaddr(mp->msg_name, &to, &len); 422 if (error != 0) 423 return (error); 424 mp->msg_name = to; 425 } else 426 to = NULL; 427 428 error = kern_sendit(td, s, mp, linux_to_bsd_msg_flags(flags), control, 429 segflg); 430 431 if (to) 432 free(to, M_SONAME); 433 return (error); 434 } 435 436 /* Return 0 if IP_HDRINCL is set for the given socket. */ 437 static int 438 linux_check_hdrincl(struct thread *td, int s) 439 { 440 int error, optval; 441 socklen_t size_val; 442 443 size_val = sizeof(optval); 444 error = kern_getsockopt(td, s, IPPROTO_IP, IP_HDRINCL, 445 &optval, UIO_SYSSPACE, &size_val); 446 if (error != 0) 447 return (error); 448 449 return (optval == 0); 450 } 451 452 /* 453 * Updated sendto() when IP_HDRINCL is set: 454 * tweak endian-dependent fields in the IP packet. 455 */ 456 static int 457 linux_sendto_hdrincl(struct thread *td, struct linux_sendto_args *linux_args) 458 { 459 /* 460 * linux_ip_copysize defines how many bytes we should copy 461 * from the beginning of the IP packet before we customize it for BSD. 462 * It should include all the fields we modify (ip_len and ip_off). 463 */ 464 #define linux_ip_copysize 8 465 466 struct ip *packet; 467 struct msghdr msg; 468 struct iovec aiov[1]; 469 int error; 470 471 /* Check that the packet isn't too big or too small. */ 472 if (linux_args->len < linux_ip_copysize || 473 linux_args->len > IP_MAXPACKET) 474 return (EINVAL); 475 476 packet = (struct ip *)malloc(linux_args->len, M_LINUX, M_WAITOK); 477 478 /* Make kernel copy of the packet to be sent */ 479 if ((error = copyin(PTRIN(linux_args->msg), packet, 480 linux_args->len))) 481 goto goout; 482 483 /* Convert fields from Linux to BSD raw IP socket format */ 484 packet->ip_len = linux_args->len; 485 packet->ip_off = ntohs(packet->ip_off); 486 487 /* Prepare the msghdr and iovec structures describing the new packet */ 488 msg.msg_name = PTRIN(linux_args->to); 489 msg.msg_namelen = linux_args->tolen; 490 msg.msg_iov = aiov; 491 msg.msg_iovlen = 1; 492 msg.msg_control = NULL; 493 msg.msg_flags = 0; 494 aiov[0].iov_base = (char *)packet; 495 aiov[0].iov_len = linux_args->len; 496 error = linux_sendit(td, linux_args->s, &msg, linux_args->flags, 497 NULL, UIO_SYSSPACE); 498 goout: 499 free(packet, M_LINUX); 500 return (error); 501 } 502 503 int 504 linux_socket(struct thread *td, struct linux_socket_args *args) 505 { 506 int domain, retval_socket, type; 507 508 type = args->type & LINUX_SOCK_TYPE_MASK; 509 if (type < 0 || type > LINUX_SOCK_MAX) 510 return (EINVAL); 511 retval_socket = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK, 512 &type); 513 if (retval_socket != 0) 514 return (retval_socket); 515 domain = linux_to_bsd_domain(args->domain); 516 if (domain == -1) 517 return (EAFNOSUPPORT); 518 519 retval_socket = kern_socket(td, domain, type, args->protocol); 520 if (retval_socket) 521 return (retval_socket); 522 523 if (type == SOCK_RAW 524 && (args->protocol == IPPROTO_RAW || args->protocol == 0) 525 && domain == PF_INET) { 526 /* It's a raw IP socket: set the IP_HDRINCL option. */ 527 int hdrincl; 528 529 hdrincl = 1; 530 /* We ignore any error returned by kern_setsockopt() */ 531 kern_setsockopt(td, td->td_retval[0], IPPROTO_IP, IP_HDRINCL, 532 &hdrincl, UIO_SYSSPACE, sizeof(hdrincl)); 533 } 534 #ifdef INET6 535 /* 536 * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by default 537 * and some apps depend on this. So, set V6ONLY to 0 for Linux apps. 538 * For simplicity we do this unconditionally of the net.inet6.ip6.v6only 539 * sysctl value. 540 */ 541 if (domain == PF_INET6) { 542 int v6only; 543 544 v6only = 0; 545 /* We ignore any error returned by setsockopt() */ 546 kern_setsockopt(td, td->td_retval[0], IPPROTO_IPV6, IPV6_V6ONLY, 547 &v6only, UIO_SYSSPACE, sizeof(v6only)); 548 } 549 #endif 550 551 return (retval_socket); 552 } 553 554 int 555 linux_bind(struct thread *td, struct linux_bind_args *args) 556 { 557 struct sockaddr *sa; 558 int error; 559 560 error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa, 561 &args->namelen); 562 if (error != 0) 563 return (error); 564 565 error = kern_bindat(td, AT_FDCWD, args->s, sa); 566 free(sa, M_SONAME); 567 568 /* XXX */ 569 if (error == EADDRNOTAVAIL && args->namelen != sizeof(struct sockaddr_in)) 570 return (EINVAL); 571 return (error); 572 } 573 574 int 575 linux_connect(struct thread *td, struct linux_connect_args *args) 576 { 577 struct socket *so; 578 struct sockaddr *sa; 579 struct file *fp; 580 u_int fflag; 581 int error; 582 583 error = linux_to_bsd_sockaddr(PTRIN(args->name), &sa, 584 &args->namelen); 585 if (error != 0) 586 return (error); 587 588 error = kern_connectat(td, AT_FDCWD, args->s, sa); 589 free(sa, M_SONAME); 590 if (error != EISCONN) 591 return (error); 592 593 /* 594 * Linux doesn't return EISCONN the first time it occurs, 595 * when on a non-blocking socket. Instead it returns the 596 * error getsockopt(SOL_SOCKET, SO_ERROR) would return on BSD. 597 */ 598 error = getsock_cap(td, args->s, &cap_connect_rights, 599 &fp, &fflag, NULL); 600 if (error != 0) 601 return (error); 602 603 error = EISCONN; 604 so = fp->f_data; 605 if (fflag & FNONBLOCK) { 606 SOCK_LOCK(so); 607 if (so->so_emuldata == 0) 608 error = so->so_error; 609 so->so_emuldata = (void *)1; 610 SOCK_UNLOCK(so); 611 } 612 fdrop(fp, td); 613 614 return (error); 615 } 616 617 int 618 linux_listen(struct thread *td, struct linux_listen_args *args) 619 { 620 621 return (kern_listen(td, args->s, args->backlog)); 622 } 623 624 static int 625 linux_accept_common(struct thread *td, int s, l_uintptr_t addr, 626 l_uintptr_t namelen, int flags) 627 { 628 struct sockaddr *sa; 629 struct file *fp, *fp1; 630 int bflags, len; 631 struct socket *so; 632 int error, error1; 633 634 bflags = 0; 635 fp = NULL; 636 sa = NULL; 637 638 error = linux_set_socket_flags(flags, &bflags); 639 if (error != 0) 640 return (error); 641 642 if (PTRIN(addr) == NULL) { 643 len = 0; 644 error = kern_accept4(td, s, NULL, NULL, bflags, NULL); 645 } else { 646 error = copyin(PTRIN(namelen), &len, sizeof(len)); 647 if (error != 0) 648 return (error); 649 if (len < 0) 650 return (EINVAL); 651 error = kern_accept4(td, s, &sa, &len, bflags, &fp); 652 } 653 654 /* 655 * Translate errno values into ones used by Linux. 656 */ 657 if (error != 0) { 658 /* 659 * XXX. This is wrong, different sockaddr structures 660 * have different sizes. 661 */ 662 switch (error) { 663 case EFAULT: 664 if (namelen != sizeof(struct sockaddr_in)) 665 error = EINVAL; 666 break; 667 case EINVAL: 668 error1 = getsock_cap(td, s, &cap_accept_rights, &fp1, NULL, NULL); 669 if (error1 != 0) { 670 error = error1; 671 break; 672 } 673 so = fp1->f_data; 674 if (so->so_type == SOCK_DGRAM) 675 error = EOPNOTSUPP; 676 fdrop(fp1, td); 677 break; 678 } 679 return (error); 680 } 681 682 if (len != 0) { 683 error = linux_copyout_sockaddr(sa, PTRIN(addr), len); 684 685 /* 686 * XXX: We should also copyout the len, shouldn't we? 687 */ 688 689 if (error != 0) { 690 fdclose(td, fp, td->td_retval[0]); 691 td->td_retval[0] = 0; 692 } 693 } 694 if (fp != NULL) 695 fdrop(fp, td); 696 free(sa, M_SONAME); 697 return (error); 698 } 699 700 int 701 linux_accept(struct thread *td, struct linux_accept_args *args) 702 { 703 704 return (linux_accept_common(td, args->s, args->addr, 705 args->namelen, 0)); 706 } 707 708 int 709 linux_accept4(struct thread *td, struct linux_accept4_args *args) 710 { 711 712 return (linux_accept_common(td, args->s, args->addr, 713 args->namelen, args->flags)); 714 } 715 716 int 717 linux_getsockname(struct thread *td, struct linux_getsockname_args *args) 718 { 719 struct sockaddr *sa; 720 int len, error; 721 722 error = copyin(PTRIN(args->namelen), &len, sizeof(len)); 723 if (error != 0) 724 return (error); 725 726 error = kern_getsockname(td, args->s, &sa, &len); 727 if (error != 0) 728 return (error); 729 730 if (len != 0) 731 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len); 732 733 free(sa, M_SONAME); 734 if (error == 0) 735 error = copyout(&len, PTRIN(args->namelen), sizeof(len)); 736 return (error); 737 } 738 739 int 740 linux_getpeername(struct thread *td, struct linux_getpeername_args *args) 741 { 742 struct sockaddr *sa; 743 int len, error; 744 745 error = copyin(PTRIN(args->namelen), &len, sizeof(len)); 746 if (error != 0) 747 return (error); 748 if (len < 0) 749 return (EINVAL); 750 751 error = kern_getpeername(td, args->s, &sa, &len); 752 if (error != 0) 753 return (error); 754 755 if (len != 0) 756 error = linux_copyout_sockaddr(sa, PTRIN(args->addr), len); 757 758 free(sa, M_SONAME); 759 if (error == 0) 760 error = copyout(&len, PTRIN(args->namelen), sizeof(len)); 761 return (error); 762 } 763 764 int 765 linux_socketpair(struct thread *td, struct linux_socketpair_args *args) 766 { 767 int domain, error, sv[2], type; 768 769 domain = linux_to_bsd_domain(args->domain); 770 if (domain != PF_LOCAL) 771 return (EAFNOSUPPORT); 772 type = args->type & LINUX_SOCK_TYPE_MASK; 773 if (type < 0 || type > LINUX_SOCK_MAX) 774 return (EINVAL); 775 error = linux_set_socket_flags(args->type & ~LINUX_SOCK_TYPE_MASK, 776 &type); 777 if (error != 0) 778 return (error); 779 if (args->protocol != 0 && args->protocol != PF_UNIX) { 780 /* 781 * Use of PF_UNIX as protocol argument is not right, 782 * but Linux does it. 783 * Do not map PF_UNIX as its Linux value is identical 784 * to FreeBSD one. 785 */ 786 return (EPROTONOSUPPORT); 787 } 788 error = kern_socketpair(td, domain, type, 0, sv); 789 if (error != 0) 790 return (error); 791 error = copyout(sv, PTRIN(args->rsv), 2 * sizeof(int)); 792 if (error != 0) { 793 (void)kern_close(td, sv[0]); 794 (void)kern_close(td, sv[1]); 795 } 796 return (error); 797 } 798 799 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) 800 struct linux_send_args { 801 register_t s; 802 register_t msg; 803 register_t len; 804 register_t flags; 805 }; 806 807 static int 808 linux_send(struct thread *td, struct linux_send_args *args) 809 { 810 struct sendto_args /* { 811 int s; 812 caddr_t buf; 813 int len; 814 int flags; 815 caddr_t to; 816 int tolen; 817 } */ bsd_args; 818 struct file *fp; 819 int error, fflag; 820 821 bsd_args.s = args->s; 822 bsd_args.buf = (caddr_t)PTRIN(args->msg); 823 bsd_args.len = args->len; 824 bsd_args.flags = args->flags; 825 bsd_args.to = NULL; 826 bsd_args.tolen = 0; 827 error = sys_sendto(td, &bsd_args); 828 if (error == ENOTCONN) { 829 /* 830 * Linux doesn't return ENOTCONN for non-blocking sockets. 831 * Instead it returns the EAGAIN. 832 */ 833 error = getsock_cap(td, args->s, &cap_send_rights, &fp, 834 &fflag, NULL); 835 if (error == 0) { 836 if (fflag & FNONBLOCK) 837 error = EAGAIN; 838 fdrop(fp, td); 839 } 840 } 841 return (error); 842 } 843 844 struct linux_recv_args { 845 register_t s; 846 register_t msg; 847 register_t len; 848 register_t flags; 849 }; 850 851 static int 852 linux_recv(struct thread *td, struct linux_recv_args *args) 853 { 854 struct recvfrom_args /* { 855 int s; 856 caddr_t buf; 857 int len; 858 int flags; 859 struct sockaddr *from; 860 socklen_t fromlenaddr; 861 } */ bsd_args; 862 863 bsd_args.s = args->s; 864 bsd_args.buf = (caddr_t)PTRIN(args->msg); 865 bsd_args.len = args->len; 866 bsd_args.flags = linux_to_bsd_msg_flags(args->flags); 867 bsd_args.from = NULL; 868 bsd_args.fromlenaddr = 0; 869 return (sys_recvfrom(td, &bsd_args)); 870 } 871 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */ 872 873 int 874 linux_sendto(struct thread *td, struct linux_sendto_args *args) 875 { 876 struct msghdr msg; 877 struct iovec aiov; 878 879 if (linux_check_hdrincl(td, args->s) == 0) 880 /* IP_HDRINCL set, tweak the packet before sending */ 881 return (linux_sendto_hdrincl(td, args)); 882 883 msg.msg_name = PTRIN(args->to); 884 msg.msg_namelen = args->tolen; 885 msg.msg_iov = &aiov; 886 msg.msg_iovlen = 1; 887 msg.msg_control = NULL; 888 msg.msg_flags = 0; 889 aiov.iov_base = PTRIN(args->msg); 890 aiov.iov_len = args->len; 891 return (linux_sendit(td, args->s, &msg, args->flags, NULL, 892 UIO_USERSPACE)); 893 } 894 895 int 896 linux_recvfrom(struct thread *td, struct linux_recvfrom_args *args) 897 { 898 struct sockaddr *sa; 899 struct msghdr msg; 900 struct iovec aiov; 901 int error, fromlen; 902 903 if (PTRIN(args->fromlen) != NULL) { 904 error = copyin(PTRIN(args->fromlen), &fromlen, 905 sizeof(fromlen)); 906 if (error != 0) 907 return (error); 908 if (fromlen < 0) 909 return (EINVAL); 910 sa = malloc(fromlen, M_SONAME, M_WAITOK); 911 } else { 912 fromlen = 0; 913 sa = NULL; 914 } 915 916 msg.msg_name = sa; 917 msg.msg_namelen = fromlen; 918 msg.msg_iov = &aiov; 919 msg.msg_iovlen = 1; 920 aiov.iov_base = PTRIN(args->buf); 921 aiov.iov_len = args->len; 922 msg.msg_control = 0; 923 msg.msg_flags = linux_to_bsd_msg_flags(args->flags); 924 925 error = kern_recvit(td, args->s, &msg, UIO_SYSSPACE, NULL); 926 if (error != 0) 927 goto out; 928 929 if (PTRIN(args->from) != NULL) 930 error = linux_copyout_sockaddr(sa, PTRIN(args->from), msg.msg_namelen); 931 932 if (error == 0 && PTRIN(args->fromlen) != NULL) 933 error = copyout(&msg.msg_namelen, PTRIN(args->fromlen), 934 sizeof(msg.msg_namelen)); 935 out: 936 free(sa, M_SONAME); 937 return (error); 938 } 939 940 static int 941 linux_sendmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr, 942 l_uint flags) 943 { 944 struct cmsghdr *cmsg; 945 struct mbuf *control; 946 struct msghdr msg; 947 struct l_cmsghdr linux_cmsg; 948 struct l_cmsghdr *ptr_cmsg; 949 struct l_msghdr linux_msghdr; 950 struct iovec *iov; 951 socklen_t datalen; 952 struct sockaddr *sa; 953 struct socket *so; 954 sa_family_t sa_family; 955 struct file *fp; 956 void *data; 957 l_size_t len; 958 l_size_t clen; 959 int error, fflag; 960 961 error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr)); 962 if (error != 0) 963 return (error); 964 965 /* 966 * Some Linux applications (ping) define a non-NULL control data 967 * pointer, but a msg_controllen of 0, which is not allowed in the 968 * FreeBSD system call interface. NULL the msg_control pointer in 969 * order to handle this case. This should be checked, but allows the 970 * Linux ping to work. 971 */ 972 if (PTRIN(linux_msghdr.msg_control) != NULL && 973 linux_msghdr.msg_controllen == 0) 974 linux_msghdr.msg_control = PTROUT(NULL); 975 976 error = linux_to_bsd_msghdr(&msg, &linux_msghdr); 977 if (error != 0) 978 return (error); 979 980 #ifdef COMPAT_LINUX32 981 error = linux32_copyiniov(PTRIN(msg.msg_iov), msg.msg_iovlen, 982 &iov, EMSGSIZE); 983 #else 984 error = copyiniov(msg.msg_iov, msg.msg_iovlen, &iov, EMSGSIZE); 985 #endif 986 if (error != 0) 987 return (error); 988 989 control = NULL; 990 991 error = kern_getsockname(td, s, &sa, &datalen); 992 if (error != 0) 993 goto bad; 994 sa_family = sa->sa_family; 995 free(sa, M_SONAME); 996 997 if (flags & LINUX_MSG_OOB) { 998 error = EOPNOTSUPP; 999 if (sa_family == AF_UNIX) 1000 goto bad; 1001 1002 error = getsock_cap(td, s, &cap_send_rights, &fp, 1003 &fflag, NULL); 1004 if (error != 0) 1005 goto bad; 1006 so = fp->f_data; 1007 if (so->so_type != SOCK_STREAM) 1008 error = EOPNOTSUPP; 1009 fdrop(fp, td); 1010 if (error != 0) 1011 goto bad; 1012 } 1013 1014 if (linux_msghdr.msg_controllen >= sizeof(struct l_cmsghdr)) { 1015 error = ENOBUFS; 1016 control = m_get(M_WAITOK, MT_CONTROL); 1017 MCLGET(control, M_WAITOK); 1018 data = mtod(control, void *); 1019 datalen = 0; 1020 1021 ptr_cmsg = PTRIN(linux_msghdr.msg_control); 1022 clen = linux_msghdr.msg_controllen; 1023 do { 1024 error = copyin(ptr_cmsg, &linux_cmsg, 1025 sizeof(struct l_cmsghdr)); 1026 if (error != 0) 1027 goto bad; 1028 1029 error = EINVAL; 1030 if (linux_cmsg.cmsg_len < sizeof(struct l_cmsghdr) || 1031 linux_cmsg.cmsg_len > clen) 1032 goto bad; 1033 1034 if (datalen + CMSG_HDRSZ > MCLBYTES) 1035 goto bad; 1036 1037 /* 1038 * Now we support only SCM_RIGHTS and SCM_CRED, 1039 * so return EINVAL in any other cmsg_type 1040 */ 1041 cmsg = data; 1042 cmsg->cmsg_type = 1043 linux_to_bsd_cmsg_type(linux_cmsg.cmsg_type); 1044 cmsg->cmsg_level = 1045 linux_to_bsd_sockopt_level(linux_cmsg.cmsg_level); 1046 if (cmsg->cmsg_type == -1 1047 || cmsg->cmsg_level != SOL_SOCKET) { 1048 linux_msg(curthread, 1049 "unsupported sendmsg cmsg level %d type %d", 1050 linux_cmsg.cmsg_level, linux_cmsg.cmsg_type); 1051 goto bad; 1052 } 1053 1054 /* 1055 * Some applications (e.g. pulseaudio) attempt to 1056 * send ancillary data even if the underlying protocol 1057 * doesn't support it which is not allowed in the 1058 * FreeBSD system call interface. 1059 */ 1060 if (sa_family != AF_UNIX) 1061 goto next; 1062 1063 if (cmsg->cmsg_type == SCM_CREDS) { 1064 len = sizeof(struct cmsgcred); 1065 if (datalen + CMSG_SPACE(len) > MCLBYTES) 1066 goto bad; 1067 1068 /* 1069 * The lower levels will fill in the structure 1070 */ 1071 memset(CMSG_DATA(data), 0, len); 1072 } else { 1073 len = linux_cmsg.cmsg_len - L_CMSG_HDRSZ; 1074 if (datalen + CMSG_SPACE(len) < datalen || 1075 datalen + CMSG_SPACE(len) > MCLBYTES) 1076 goto bad; 1077 1078 error = copyin(LINUX_CMSG_DATA(ptr_cmsg), 1079 CMSG_DATA(data), len); 1080 if (error != 0) 1081 goto bad; 1082 } 1083 1084 cmsg->cmsg_len = CMSG_LEN(len); 1085 data = (char *)data + CMSG_SPACE(len); 1086 datalen += CMSG_SPACE(len); 1087 1088 next: 1089 if (clen <= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len)) 1090 break; 1091 1092 clen -= LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len); 1093 ptr_cmsg = (struct l_cmsghdr *)((char *)ptr_cmsg + 1094 LINUX_CMSG_ALIGN(linux_cmsg.cmsg_len)); 1095 } while(clen >= sizeof(struct l_cmsghdr)); 1096 1097 control->m_len = datalen; 1098 if (datalen == 0) { 1099 m_freem(control); 1100 control = NULL; 1101 } 1102 } 1103 1104 msg.msg_iov = iov; 1105 msg.msg_flags = 0; 1106 error = linux_sendit(td, s, &msg, flags, control, UIO_USERSPACE); 1107 control = NULL; 1108 1109 bad: 1110 m_freem(control); 1111 free(iov, M_IOV); 1112 return (error); 1113 } 1114 1115 int 1116 linux_sendmsg(struct thread *td, struct linux_sendmsg_args *args) 1117 { 1118 1119 return (linux_sendmsg_common(td, args->s, PTRIN(args->msg), 1120 args->flags)); 1121 } 1122 1123 int 1124 linux_sendmmsg(struct thread *td, struct linux_sendmmsg_args *args) 1125 { 1126 struct l_mmsghdr *msg; 1127 l_uint retval; 1128 int error, datagrams; 1129 1130 if (args->vlen > UIO_MAXIOV) 1131 args->vlen = UIO_MAXIOV; 1132 1133 msg = PTRIN(args->msg); 1134 datagrams = 0; 1135 while (datagrams < args->vlen) { 1136 error = linux_sendmsg_common(td, args->s, &msg->msg_hdr, 1137 args->flags); 1138 if (error != 0) 1139 break; 1140 1141 retval = td->td_retval[0]; 1142 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len)); 1143 if (error != 0) 1144 break; 1145 ++msg; 1146 ++datagrams; 1147 } 1148 if (error == 0) 1149 td->td_retval[0] = datagrams; 1150 return (error); 1151 } 1152 1153 static int 1154 linux_recvmsg_common(struct thread *td, l_int s, struct l_msghdr *msghdr, 1155 l_uint flags, struct msghdr *msg) 1156 { 1157 struct cmsghdr *cm; 1158 struct cmsgcred *cmcred; 1159 struct l_cmsghdr *linux_cmsg = NULL; 1160 struct l_ucred linux_ucred; 1161 socklen_t datalen, maxlen, outlen; 1162 struct l_msghdr linux_msghdr; 1163 struct iovec *iov, *uiov; 1164 struct mbuf *control = NULL; 1165 struct mbuf **controlp; 1166 struct timeval *ftmvl; 1167 struct sockaddr *sa; 1168 l_timeval ltmvl; 1169 caddr_t outbuf; 1170 void *data; 1171 int error, i, fd, fds, *fdp; 1172 1173 error = copyin(msghdr, &linux_msghdr, sizeof(linux_msghdr)); 1174 if (error != 0) 1175 return (error); 1176 1177 error = linux_to_bsd_msghdr(msg, &linux_msghdr); 1178 if (error != 0) 1179 return (error); 1180 1181 #ifdef COMPAT_LINUX32 1182 error = linux32_copyiniov(PTRIN(msg->msg_iov), msg->msg_iovlen, 1183 &iov, EMSGSIZE); 1184 #else 1185 error = copyiniov(msg->msg_iov, msg->msg_iovlen, &iov, EMSGSIZE); 1186 #endif 1187 if (error != 0) 1188 return (error); 1189 1190 if (msg->msg_name != NULL && msg->msg_namelen > 0) { 1191 msg->msg_namelen = min(msg->msg_namelen, SOCK_MAXADDRLEN); 1192 sa = malloc(msg->msg_namelen, M_SONAME, M_WAITOK); 1193 msg->msg_name = sa; 1194 } else { 1195 sa = NULL; 1196 msg->msg_name = NULL; 1197 } 1198 1199 uiov = msg->msg_iov; 1200 msg->msg_iov = iov; 1201 controlp = (msg->msg_control != NULL) ? &control : NULL; 1202 error = kern_recvit(td, s, msg, UIO_SYSSPACE, controlp); 1203 msg->msg_iov = uiov; 1204 if (error != 0) 1205 goto bad; 1206 1207 /* 1208 * Note that kern_recvit() updates msg->msg_namelen. 1209 */ 1210 if (msg->msg_name != NULL && msg->msg_namelen > 0) { 1211 msg->msg_name = PTRIN(linux_msghdr.msg_name); 1212 error = linux_copyout_sockaddr(sa, 1213 PTRIN(msg->msg_name), msg->msg_namelen); 1214 if (error != 0) 1215 goto bad; 1216 } 1217 1218 error = bsd_to_linux_msghdr(msg, &linux_msghdr); 1219 if (error != 0) 1220 goto bad; 1221 1222 maxlen = linux_msghdr.msg_controllen; 1223 linux_msghdr.msg_controllen = 0; 1224 if (control) { 1225 linux_cmsg = malloc(L_CMSG_HDRSZ, M_LINUX, M_WAITOK | M_ZERO); 1226 1227 msg->msg_control = mtod(control, struct cmsghdr *); 1228 msg->msg_controllen = control->m_len; 1229 1230 cm = CMSG_FIRSTHDR(msg); 1231 outbuf = PTRIN(linux_msghdr.msg_control); 1232 outlen = 0; 1233 while (cm != NULL) { 1234 linux_cmsg->cmsg_type = 1235 bsd_to_linux_cmsg_type(cm->cmsg_type); 1236 linux_cmsg->cmsg_level = 1237 bsd_to_linux_sockopt_level(cm->cmsg_level); 1238 if (linux_cmsg->cmsg_type == -1 || 1239 cm->cmsg_level != SOL_SOCKET) { 1240 linux_msg(curthread, 1241 "unsupported recvmsg cmsg level %d type %d", 1242 cm->cmsg_level, cm->cmsg_type); 1243 error = EINVAL; 1244 goto bad; 1245 } 1246 1247 data = CMSG_DATA(cm); 1248 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data; 1249 1250 switch (cm->cmsg_type) { 1251 case SCM_RIGHTS: 1252 if (flags & LINUX_MSG_CMSG_CLOEXEC) { 1253 fds = datalen / sizeof(int); 1254 fdp = data; 1255 for (i = 0; i < fds; i++) { 1256 fd = *fdp++; 1257 (void)kern_fcntl(td, fd, 1258 F_SETFD, FD_CLOEXEC); 1259 } 1260 } 1261 break; 1262 1263 case SCM_CREDS: 1264 /* 1265 * Currently LOCAL_CREDS is never in 1266 * effect for Linux so no need to worry 1267 * about sockcred 1268 */ 1269 if (datalen != sizeof(*cmcred)) { 1270 error = EMSGSIZE; 1271 goto bad; 1272 } 1273 cmcred = (struct cmsgcred *)data; 1274 bzero(&linux_ucred, sizeof(linux_ucred)); 1275 linux_ucred.pid = cmcred->cmcred_pid; 1276 linux_ucred.uid = cmcred->cmcred_uid; 1277 linux_ucred.gid = cmcred->cmcred_gid; 1278 data = &linux_ucred; 1279 datalen = sizeof(linux_ucred); 1280 break; 1281 1282 case SCM_TIMESTAMP: 1283 if (datalen != sizeof(struct timeval)) { 1284 error = EMSGSIZE; 1285 goto bad; 1286 } 1287 ftmvl = (struct timeval *)data; 1288 ltmvl.tv_sec = ftmvl->tv_sec; 1289 ltmvl.tv_usec = ftmvl->tv_usec; 1290 data = <mvl; 1291 datalen = sizeof(ltmvl); 1292 break; 1293 } 1294 1295 if (outlen + LINUX_CMSG_LEN(datalen) > maxlen) { 1296 if (outlen == 0) { 1297 error = EMSGSIZE; 1298 goto bad; 1299 } else { 1300 linux_msghdr.msg_flags |= LINUX_MSG_CTRUNC; 1301 m_dispose_extcontrolm(control); 1302 goto out; 1303 } 1304 } 1305 1306 linux_cmsg->cmsg_len = LINUX_CMSG_LEN(datalen); 1307 1308 error = copyout(linux_cmsg, outbuf, L_CMSG_HDRSZ); 1309 if (error != 0) 1310 goto bad; 1311 outbuf += L_CMSG_HDRSZ; 1312 1313 error = copyout(data, outbuf, datalen); 1314 if (error != 0) 1315 goto bad; 1316 1317 outbuf += LINUX_CMSG_ALIGN(datalen); 1318 outlen += LINUX_CMSG_LEN(datalen); 1319 1320 cm = CMSG_NXTHDR(msg, cm); 1321 } 1322 linux_msghdr.msg_controllen = outlen; 1323 } 1324 1325 out: 1326 error = copyout(&linux_msghdr, msghdr, sizeof(linux_msghdr)); 1327 1328 bad: 1329 if (control != NULL) { 1330 if (error != 0) 1331 m_dispose_extcontrolm(control); 1332 m_freem(control); 1333 } 1334 free(iov, M_IOV); 1335 free(linux_cmsg, M_LINUX); 1336 free(sa, M_SONAME); 1337 1338 return (error); 1339 } 1340 1341 int 1342 linux_recvmsg(struct thread *td, struct linux_recvmsg_args *args) 1343 { 1344 struct msghdr bsd_msg; 1345 1346 return (linux_recvmsg_common(td, args->s, PTRIN(args->msg), 1347 args->flags, &bsd_msg)); 1348 } 1349 1350 int 1351 linux_recvmmsg(struct thread *td, struct linux_recvmmsg_args *args) 1352 { 1353 struct l_mmsghdr *msg; 1354 struct msghdr bsd_msg; 1355 struct l_timespec lts; 1356 struct timespec ts, tts; 1357 l_uint retval; 1358 int error, datagrams; 1359 1360 if (args->timeout) { 1361 error = copyin(args->timeout, <s, sizeof(struct l_timespec)); 1362 if (error != 0) 1363 return (error); 1364 error = linux_to_native_timespec(&ts, <s); 1365 if (error != 0) 1366 return (error); 1367 getnanotime(&tts); 1368 timespecadd(&tts, &ts, &tts); 1369 } 1370 1371 msg = PTRIN(args->msg); 1372 datagrams = 0; 1373 while (datagrams < args->vlen) { 1374 error = linux_recvmsg_common(td, args->s, &msg->msg_hdr, 1375 args->flags & ~LINUX_MSG_WAITFORONE, &bsd_msg); 1376 if (error != 0) 1377 break; 1378 1379 retval = td->td_retval[0]; 1380 error = copyout(&retval, &msg->msg_len, sizeof(msg->msg_len)); 1381 if (error != 0) 1382 break; 1383 ++msg; 1384 ++datagrams; 1385 1386 /* 1387 * MSG_WAITFORONE turns on MSG_DONTWAIT after one packet. 1388 */ 1389 if (args->flags & LINUX_MSG_WAITFORONE) 1390 args->flags |= LINUX_MSG_DONTWAIT; 1391 1392 /* 1393 * See BUGS section of recvmmsg(2). 1394 */ 1395 if (args->timeout) { 1396 getnanotime(&ts); 1397 timespecsub(&ts, &tts, &ts); 1398 if (!timespecisset(&ts) || ts.tv_sec > 0) 1399 break; 1400 } 1401 /* Out of band data, return right away. */ 1402 if (bsd_msg.msg_flags & MSG_OOB) 1403 break; 1404 } 1405 if (error == 0) 1406 td->td_retval[0] = datagrams; 1407 return (error); 1408 } 1409 1410 int 1411 linux_shutdown(struct thread *td, struct linux_shutdown_args *args) 1412 { 1413 1414 return (kern_shutdown(td, args->s, args->how)); 1415 } 1416 1417 int 1418 linux_setsockopt(struct thread *td, struct linux_setsockopt_args *args) 1419 { 1420 l_timeval linux_tv; 1421 struct sockaddr *sa; 1422 struct timeval tv; 1423 socklen_t len; 1424 int error, level, name; 1425 1426 level = linux_to_bsd_sockopt_level(args->level); 1427 switch (level) { 1428 case SOL_SOCKET: 1429 name = linux_to_bsd_so_sockopt(args->optname); 1430 switch (name) { 1431 case SO_RCVTIMEO: 1432 /* FALLTHROUGH */ 1433 case SO_SNDTIMEO: 1434 error = copyin(PTRIN(args->optval), &linux_tv, 1435 sizeof(linux_tv)); 1436 if (error != 0) 1437 return (error); 1438 tv.tv_sec = linux_tv.tv_sec; 1439 tv.tv_usec = linux_tv.tv_usec; 1440 return (kern_setsockopt(td, args->s, level, 1441 name, &tv, UIO_SYSSPACE, sizeof(tv))); 1442 /* NOTREACHED */ 1443 default: 1444 break; 1445 } 1446 break; 1447 case IPPROTO_IP: 1448 if (args->optname == LINUX_IP_RECVERR && 1449 linux_ignore_ip_recverr) { 1450 /* 1451 * XXX: This is a hack to unbreak DNS resolution 1452 * with glibc 2.30 and above. 1453 */ 1454 return (0); 1455 } 1456 name = linux_to_bsd_ip_sockopt(args->optname); 1457 break; 1458 case IPPROTO_IPV6: 1459 name = linux_to_bsd_ip6_sockopt(args->optname); 1460 break; 1461 case IPPROTO_TCP: 1462 name = linux_to_bsd_tcp_sockopt(args->optname); 1463 break; 1464 default: 1465 name = -1; 1466 break; 1467 } 1468 if (name == -1) { 1469 linux_msg(curthread, 1470 "unsupported setsockopt level %d optname %d", 1471 args->level, args->optname); 1472 return (ENOPROTOOPT); 1473 } 1474 1475 if (name == IPV6_NEXTHOP) { 1476 len = args->optlen; 1477 error = linux_to_bsd_sockaddr(PTRIN(args->optval), &sa, &len); 1478 if (error != 0) 1479 return (error); 1480 1481 error = kern_setsockopt(td, args->s, level, 1482 name, sa, UIO_SYSSPACE, len); 1483 free(sa, M_SONAME); 1484 } else { 1485 error = kern_setsockopt(td, args->s, level, 1486 name, PTRIN(args->optval), UIO_USERSPACE, args->optlen); 1487 } 1488 1489 return (error); 1490 } 1491 1492 int 1493 linux_getsockopt(struct thread *td, struct linux_getsockopt_args *args) 1494 { 1495 l_timeval linux_tv; 1496 struct timeval tv; 1497 socklen_t tv_len, xulen, len; 1498 struct sockaddr *sa; 1499 struct xucred xu; 1500 struct l_ucred lxu; 1501 int error, level, name, newval; 1502 1503 level = linux_to_bsd_sockopt_level(args->level); 1504 switch (level) { 1505 case SOL_SOCKET: 1506 name = linux_to_bsd_so_sockopt(args->optname); 1507 switch (name) { 1508 case SO_RCVTIMEO: 1509 /* FALLTHROUGH */ 1510 case SO_SNDTIMEO: 1511 tv_len = sizeof(tv); 1512 error = kern_getsockopt(td, args->s, level, 1513 name, &tv, UIO_SYSSPACE, &tv_len); 1514 if (error != 0) 1515 return (error); 1516 linux_tv.tv_sec = tv.tv_sec; 1517 linux_tv.tv_usec = tv.tv_usec; 1518 return (copyout(&linux_tv, PTRIN(args->optval), 1519 sizeof(linux_tv))); 1520 /* NOTREACHED */ 1521 case LOCAL_PEERCRED: 1522 if (args->optlen < sizeof(lxu)) 1523 return (EINVAL); 1524 /* 1525 * LOCAL_PEERCRED is not served at the SOL_SOCKET level, 1526 * but by the Unix socket's level 0. 1527 */ 1528 level = 0; 1529 xulen = sizeof(xu); 1530 error = kern_getsockopt(td, args->s, level, 1531 name, &xu, UIO_SYSSPACE, &xulen); 1532 if (error != 0) 1533 return (error); 1534 lxu.pid = xu.cr_pid; 1535 lxu.uid = xu.cr_uid; 1536 lxu.gid = xu.cr_gid; 1537 return (copyout(&lxu, PTRIN(args->optval), sizeof(lxu))); 1538 /* NOTREACHED */ 1539 case SO_ERROR: 1540 len = sizeof(newval); 1541 error = kern_getsockopt(td, args->s, level, 1542 name, &newval, UIO_SYSSPACE, &len); 1543 if (error != 0) 1544 return (error); 1545 newval = -linux_to_bsd_errno(newval); 1546 return (copyout(&newval, PTRIN(args->optval), len)); 1547 /* NOTREACHED */ 1548 default: 1549 break; 1550 } 1551 break; 1552 case IPPROTO_IP: 1553 name = linux_to_bsd_ip_sockopt(args->optname); 1554 break; 1555 case IPPROTO_IPV6: 1556 name = linux_to_bsd_ip6_sockopt(args->optname); 1557 break; 1558 case IPPROTO_TCP: 1559 name = linux_to_bsd_tcp_sockopt(args->optname); 1560 break; 1561 default: 1562 name = -1; 1563 break; 1564 } 1565 if (name == -1) { 1566 linux_msg(curthread, 1567 "unsupported getsockopt level %d optname %d", 1568 args->level, args->optname); 1569 return (EINVAL); 1570 } 1571 1572 if (name == IPV6_NEXTHOP) { 1573 error = copyin(PTRIN(args->optlen), &len, sizeof(len)); 1574 if (error != 0) 1575 return (error); 1576 sa = malloc(len, M_SONAME, M_WAITOK); 1577 1578 error = kern_getsockopt(td, args->s, level, 1579 name, sa, UIO_SYSSPACE, &len); 1580 if (error != 0) 1581 goto out; 1582 1583 error = linux_copyout_sockaddr(sa, PTRIN(args->optval), len); 1584 if (error == 0) 1585 error = copyout(&len, PTRIN(args->optlen), 1586 sizeof(len)); 1587 out: 1588 free(sa, M_SONAME); 1589 } else { 1590 if (args->optval) { 1591 error = copyin(PTRIN(args->optlen), &len, sizeof(len)); 1592 if (error != 0) 1593 return (error); 1594 } 1595 error = kern_getsockopt(td, args->s, level, 1596 name, PTRIN(args->optval), UIO_USERSPACE, &len); 1597 if (error == 0) 1598 error = copyout(&len, PTRIN(args->optlen), 1599 sizeof(len)); 1600 } 1601 1602 return (error); 1603 } 1604 1605 static int 1606 linux_sendfile_common(struct thread *td, l_int out, l_int in, 1607 l_loff_t *offset, l_size_t count) 1608 { 1609 off_t bytes_read; 1610 int error; 1611 l_loff_t current_offset; 1612 struct file *fp; 1613 1614 AUDIT_ARG_FD(in); 1615 error = fget_read(td, in, &cap_pread_rights, &fp); 1616 if (error != 0) 1617 return (error); 1618 1619 if (offset != NULL) { 1620 current_offset = *offset; 1621 } else { 1622 error = (fp->f_ops->fo_flags & DFLAG_SEEKABLE) != 0 ? 1623 fo_seek(fp, 0, SEEK_CUR, td) : ESPIPE; 1624 if (error != 0) 1625 goto drop; 1626 current_offset = td->td_uretoff.tdu_off; 1627 } 1628 1629 bytes_read = 0; 1630 1631 /* Linux cannot have 0 count. */ 1632 if (count <= 0 || current_offset < 0) { 1633 error = EINVAL; 1634 goto drop; 1635 } 1636 1637 error = fo_sendfile(fp, out, NULL, NULL, current_offset, count, 1638 &bytes_read, 0, td); 1639 if (error != 0) 1640 goto drop; 1641 current_offset += bytes_read; 1642 1643 if (offset != NULL) { 1644 *offset = current_offset; 1645 } else { 1646 error = fo_seek(fp, current_offset, SEEK_SET, td); 1647 if (error != 0) 1648 goto drop; 1649 } 1650 1651 td->td_retval[0] = (ssize_t)bytes_read; 1652 drop: 1653 fdrop(fp, td); 1654 return (error); 1655 } 1656 1657 int 1658 linux_sendfile(struct thread *td, struct linux_sendfile_args *arg) 1659 { 1660 /* 1661 * Differences between FreeBSD and Linux sendfile: 1662 * - Linux doesn't send anything when count is 0 (FreeBSD uses 0 to 1663 * mean send the whole file.) In linux_sendfile given fds are still 1664 * checked for validity when the count is 0. 1665 * - Linux can send to any fd whereas FreeBSD only supports sockets. 1666 * The same restriction follows for linux_sendfile. 1667 * - Linux doesn't have an equivalent for FreeBSD's flags and sf_hdtr. 1668 * - Linux takes an offset pointer and updates it to the read location. 1669 * FreeBSD takes in an offset and a 'bytes read' parameter which is 1670 * only filled if it isn't NULL. We use this parameter to update the 1671 * offset pointer if it exists. 1672 * - Linux sendfile returns bytes read on success while FreeBSD 1673 * returns 0. We use the 'bytes read' parameter to get this value. 1674 */ 1675 1676 l_loff_t offset64; 1677 l_long offset; 1678 int ret; 1679 int error; 1680 1681 if (arg->offset != NULL) { 1682 error = copyin(arg->offset, &offset, sizeof(offset)); 1683 if (error != 0) 1684 return (error); 1685 offset64 = (l_loff_t)offset; 1686 } 1687 1688 ret = linux_sendfile_common(td, arg->out, arg->in, 1689 arg->offset != NULL ? &offset64 : NULL, arg->count); 1690 1691 if (arg->offset != NULL) { 1692 #if defined(__i386__) || defined(__arm__) || \ 1693 (defined(__amd64__) && defined(COMPAT_LINUX32)) 1694 if (offset64 > INT32_MAX) 1695 return (EOVERFLOW); 1696 #endif 1697 offset = (l_long)offset64; 1698 error = copyout(&offset, arg->offset, sizeof(offset)); 1699 if (error != 0) 1700 return (error); 1701 } 1702 1703 return (ret); 1704 } 1705 1706 #if defined(__i386__) || defined(__arm__) || \ 1707 (defined(__amd64__) && defined(COMPAT_LINUX32)) 1708 1709 int 1710 linux_sendfile64(struct thread *td, struct linux_sendfile64_args *arg) 1711 { 1712 l_loff_t offset; 1713 int ret; 1714 int error; 1715 1716 if (arg->offset != NULL) { 1717 error = copyin(arg->offset, &offset, sizeof(offset)); 1718 if (error != 0) 1719 return (error); 1720 } 1721 1722 ret = linux_sendfile_common(td, arg->out, arg->in, 1723 arg->offset != NULL ? &offset : NULL, arg->count); 1724 1725 if (arg->offset != NULL) { 1726 error = copyout(&offset, arg->offset, sizeof(offset)); 1727 if (error != 0) 1728 return (error); 1729 } 1730 1731 return (ret); 1732 } 1733 1734 /* Argument list sizes for linux_socketcall */ 1735 static const unsigned char lxs_args_cnt[] = { 1736 0 /* unused*/, 3 /* socket */, 1737 3 /* bind */, 3 /* connect */, 1738 2 /* listen */, 3 /* accept */, 1739 3 /* getsockname */, 3 /* getpeername */, 1740 4 /* socketpair */, 4 /* send */, 1741 4 /* recv */, 6 /* sendto */, 1742 6 /* recvfrom */, 2 /* shutdown */, 1743 5 /* setsockopt */, 5 /* getsockopt */, 1744 3 /* sendmsg */, 3 /* recvmsg */, 1745 4 /* accept4 */, 5 /* recvmmsg */, 1746 4 /* sendmmsg */, 4 /* sendfile */ 1747 }; 1748 #define LINUX_ARGS_CNT (nitems(lxs_args_cnt) - 1) 1749 #define LINUX_ARG_SIZE(x) (lxs_args_cnt[x] * sizeof(l_ulong)) 1750 1751 int 1752 linux_socketcall(struct thread *td, struct linux_socketcall_args *args) 1753 { 1754 l_ulong a[6]; 1755 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1756 register_t l_args[6]; 1757 #endif 1758 void *arg; 1759 int error; 1760 1761 if (args->what < LINUX_SOCKET || args->what > LINUX_ARGS_CNT) 1762 return (EINVAL); 1763 error = copyin(PTRIN(args->args), a, LINUX_ARG_SIZE(args->what)); 1764 if (error != 0) 1765 return (error); 1766 1767 #if defined(__amd64__) && defined(COMPAT_LINUX32) 1768 for (int i = 0; i < lxs_args_cnt[args->what]; ++i) 1769 l_args[i] = a[i]; 1770 arg = l_args; 1771 #else 1772 arg = a; 1773 #endif 1774 switch (args->what) { 1775 case LINUX_SOCKET: 1776 return (linux_socket(td, arg)); 1777 case LINUX_BIND: 1778 return (linux_bind(td, arg)); 1779 case LINUX_CONNECT: 1780 return (linux_connect(td, arg)); 1781 case LINUX_LISTEN: 1782 return (linux_listen(td, arg)); 1783 case LINUX_ACCEPT: 1784 return (linux_accept(td, arg)); 1785 case LINUX_GETSOCKNAME: 1786 return (linux_getsockname(td, arg)); 1787 case LINUX_GETPEERNAME: 1788 return (linux_getpeername(td, arg)); 1789 case LINUX_SOCKETPAIR: 1790 return (linux_socketpair(td, arg)); 1791 case LINUX_SEND: 1792 return (linux_send(td, arg)); 1793 case LINUX_RECV: 1794 return (linux_recv(td, arg)); 1795 case LINUX_SENDTO: 1796 return (linux_sendto(td, arg)); 1797 case LINUX_RECVFROM: 1798 return (linux_recvfrom(td, arg)); 1799 case LINUX_SHUTDOWN: 1800 return (linux_shutdown(td, arg)); 1801 case LINUX_SETSOCKOPT: 1802 return (linux_setsockopt(td, arg)); 1803 case LINUX_GETSOCKOPT: 1804 return (linux_getsockopt(td, arg)); 1805 case LINUX_SENDMSG: 1806 return (linux_sendmsg(td, arg)); 1807 case LINUX_RECVMSG: 1808 return (linux_recvmsg(td, arg)); 1809 case LINUX_ACCEPT4: 1810 return (linux_accept4(td, arg)); 1811 case LINUX_RECVMMSG: 1812 return (linux_recvmmsg(td, arg)); 1813 case LINUX_SENDMMSG: 1814 return (linux_sendmmsg(td, arg)); 1815 case LINUX_SENDFILE: 1816 return (linux_sendfile(td, arg)); 1817 } 1818 1819 linux_msg(td, "socket type %d not implemented", args->what); 1820 return (ENOSYS); 1821 } 1822 #endif /* __i386__ || __arm__ || (__amd64__ && COMPAT_LINUX32) */ 1823