1 /* $NetBSD: linux_socket.c,v 1.133 2016/09/13 07:01:07 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Functions in multiarch: 34 * linux_sys_socketcall : linux_socketcall.c 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: linux_socket.c,v 1.133 2016/09/13 07:01:07 martin Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_inet.h" 42 #endif /* defined(_KERNEL_OPT) */ 43 44 #include <sys/param.h> 45 #include <sys/kernel.h> 46 #include <sys/systm.h> 47 #include <sys/buf.h> 48 #include <sys/ioctl.h> 49 #include <sys/tty.h> 50 #include <sys/file.h> 51 #include <sys/filedesc.h> 52 #include <sys/select.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/domain.h> 56 #include <net/if.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <netinet/in.h> 60 #include <netinet/tcp.h> 61 #include <sys/mount.h> 62 #include <sys/proc.h> 63 #include <sys/vnode.h> 64 #include <sys/device.h> 65 #include <sys/protosw.h> 66 #include <sys/mbuf.h> 67 #include <sys/syslog.h> 68 #include <sys/exec.h> 69 #include <sys/kauth.h> 70 #include <sys/syscallargs.h> 71 #include <sys/ktrace.h> 72 73 #include <lib/libkern/libkern.h> 74 75 #include <netinet/ip6.h> 76 #include <netinet6/ip6_var.h> 77 78 #include <compat/sys/socket.h> 79 #include <compat/sys/sockio.h> 80 81 #include <compat/linux/common/linux_types.h> 82 #include <compat/linux/common/linux_util.h> 83 #include <compat/linux/common/linux_signal.h> 84 #include <compat/linux/common/linux_ioctl.h> 85 #include <compat/linux/common/linux_socket.h> 86 #include <compat/linux/common/linux_fcntl.h> 87 #if !defined(__alpha__) && !defined(__amd64__) 88 #include <compat/linux/common/linux_socketcall.h> 89 #endif 90 #include <compat/linux/common/linux_sockio.h> 91 #include <compat/linux/common/linux_ipc.h> 92 #include <compat/linux/common/linux_sem.h> 93 94 #include <compat/linux/linux_syscallargs.h> 95 96 #ifdef DEBUG_LINUX 97 #define DPRINTF(a) uprintf a 98 #else 99 #define DPRINTF(a) 100 #endif 101 102 /* 103 * The calls in this file are entered either via the linux_socketcall() 104 * interface or, on the Alpha, as individual syscalls. The 105 * linux_socketcall function does any massaging of arguments so that all 106 * the calls in here need not think that they are anything other 107 * than a normal syscall. 108 */ 109 110 static int linux_to_bsd_domain(int); 111 static int bsd_to_linux_domain(int); 112 static int linux_to_bsd_type(int); 113 int linux_to_bsd_sopt_level(int); 114 int linux_to_bsd_so_sockopt(int); 115 int linux_to_bsd_ip_sockopt(int); 116 int linux_to_bsd_ipv6_sockopt(int); 117 int linux_to_bsd_tcp_sockopt(int); 118 int linux_to_bsd_udp_sockopt(int); 119 int linux_getifname(struct lwp *, register_t *, void *); 120 int linux_getifconf(struct lwp *, register_t *, void *); 121 int linux_getifhwaddr(struct lwp *, register_t *, u_int, void *); 122 static int linux_get_sa(struct lwp *, int, struct sockaddr_big *, 123 const struct osockaddr *, socklen_t); 124 static int linux_sa_put(struct osockaddr *osa); 125 static int linux_to_bsd_msg_flags(int); 126 static int bsd_to_linux_msg_flags(int); 127 static void linux_to_bsd_msghdr(struct linux_msghdr *, struct msghdr *); 128 static void bsd_to_linux_msghdr(struct msghdr *, struct linux_msghdr *); 129 130 static const int linux_to_bsd_domain_[LINUX_AF_MAX] = { 131 AF_UNSPEC, 132 AF_UNIX, 133 AF_INET, 134 AF_CCITT, /* LINUX_AF_AX25 */ 135 AF_IPX, 136 AF_APPLETALK, 137 -1, /* LINUX_AF_NETROM */ 138 -1, /* LINUX_AF_BRIDGE */ 139 -1, /* LINUX_AF_ATMPVC */ 140 AF_CCITT, /* LINUX_AF_X25 */ 141 AF_INET6, 142 -1, /* LINUX_AF_ROSE */ 143 AF_DECnet, 144 -1, /* LINUX_AF_NETBEUI */ 145 -1, /* LINUX_AF_SECURITY */ 146 pseudo_AF_KEY, 147 AF_ROUTE, /* LINUX_AF_NETLINK */ 148 -1, /* LINUX_AF_PACKET */ 149 -1, /* LINUX_AF_ASH */ 150 -1, /* LINUX_AF_ECONET */ 151 -1, /* LINUX_AF_ATMSVC */ 152 AF_SNA, 153 /* rest up to LINUX_AF_MAX-1 is not allocated */ 154 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 155 }; 156 157 static const int bsd_to_linux_domain_[AF_MAX] = { 158 LINUX_AF_UNSPEC, 159 LINUX_AF_UNIX, 160 LINUX_AF_INET, 161 -1, /* AF_IMPLINK */ 162 -1, /* AF_PUP */ 163 -1, /* AF_CHAOS */ 164 -1, /* AF_NS */ 165 -1, /* AF_ISO */ 166 -1, /* AF_ECMA */ 167 -1, /* AF_DATAKIT */ 168 LINUX_AF_AX25, /* AF_CCITT */ 169 LINUX_AF_SNA, 170 LINUX_AF_DECnet, 171 -1, /* AF_DLI */ 172 -1, /* AF_LAT */ 173 -1, /* AF_HYLINK */ 174 LINUX_AF_APPLETALK, 175 LINUX_AF_NETLINK, 176 -1, /* AF_LINK */ 177 -1, /* AF_XTP */ 178 -1, /* AF_COIP */ 179 -1, /* AF_CNT */ 180 -1, /* pseudo_AF_RTIP */ 181 LINUX_AF_IPX, 182 LINUX_AF_INET6, 183 -1, /* pseudo_AF_PIP */ 184 -1, /* AF_ISDN */ 185 -1, /* AF_NATM */ 186 -1, /* AF_ARP */ 187 LINUX_pseudo_AF_KEY, 188 -1, /* pseudo_AF_HDRCMPLT */ 189 }; 190 191 static const struct { 192 int bfl; 193 int lfl; 194 } bsd_to_linux_msg_flags_[] = { 195 {MSG_OOB, LINUX_MSG_OOB}, 196 {MSG_PEEK, LINUX_MSG_PEEK}, 197 {MSG_DONTROUTE, LINUX_MSG_DONTROUTE}, 198 {MSG_EOR, LINUX_MSG_EOR}, 199 {MSG_TRUNC, LINUX_MSG_TRUNC}, 200 {MSG_CTRUNC, LINUX_MSG_CTRUNC}, 201 {MSG_WAITALL, LINUX_MSG_WAITALL}, 202 {MSG_DONTWAIT, LINUX_MSG_DONTWAIT}, 203 {MSG_BCAST, 0}, /* not supported, clear */ 204 {MSG_MCAST, 0}, /* not supported, clear */ 205 {MSG_NOSIGNAL, LINUX_MSG_NOSIGNAL}, 206 {-1, /* not supp */ LINUX_MSG_PROBE}, 207 {-1, /* not supp */ LINUX_MSG_FIN}, 208 {-1, /* not supp */ LINUX_MSG_SYN}, 209 {-1, /* not supp */ LINUX_MSG_CONFIRM}, 210 {-1, /* not supp */ LINUX_MSG_RST}, 211 {-1, /* not supp */ LINUX_MSG_ERRQUEUE}, 212 {-1, /* not supp */ LINUX_MSG_MORE}, 213 }; 214 215 /* 216 * Convert between Linux and BSD socket domain values 217 */ 218 static int 219 linux_to_bsd_domain(int ldom) 220 { 221 if (ldom < 0 || ldom >= LINUX_AF_MAX) 222 return (-1); 223 224 return linux_to_bsd_domain_[ldom]; 225 } 226 227 /* 228 * Convert between BSD and Linux socket domain values 229 */ 230 static int 231 bsd_to_linux_domain(int bdom) 232 { 233 if (bdom < 0 || bdom >= AF_MAX) 234 return (-1); 235 236 return bsd_to_linux_domain_[bdom]; 237 } 238 239 static int 240 linux_to_bsd_type(int ltype) 241 { 242 int type, flags; 243 244 /* Real types are identical between Linux and NetBSD */ 245 type = ltype & LINUX_SOCK_TYPE_MASK; 246 247 /* But flags are not .. */ 248 flags = ltype & ~LINUX_SOCK_TYPE_MASK; 249 if (flags & ~(LINUX_SOCK_CLOEXEC|LINUX_SOCK_NONBLOCK)) 250 return -1; 251 252 if (flags & LINUX_SOCK_CLOEXEC) 253 type |= SOCK_CLOEXEC; 254 if (flags & LINUX_SOCK_NONBLOCK) 255 type |= SOCK_NONBLOCK; 256 257 return type; 258 } 259 260 static int 261 linux_to_bsd_msg_flags(int lflag) 262 { 263 int i, lfl, bfl; 264 int bflag = 0; 265 266 if (lflag == 0) 267 return (0); 268 269 for(i = 0; i < __arraycount(bsd_to_linux_msg_flags_); i++) { 270 bfl = bsd_to_linux_msg_flags_[i].bfl; 271 lfl = bsd_to_linux_msg_flags_[i].lfl; 272 273 if (lfl == 0) 274 continue; 275 276 if (lflag & lfl) { 277 if (bfl < 0) 278 return (-1); 279 280 bflag |= bfl; 281 } 282 } 283 284 return (bflag); 285 } 286 287 static int 288 bsd_to_linux_msg_flags(int bflag) 289 { 290 int i, lfl, bfl; 291 int lflag = 0; 292 293 if (bflag == 0) 294 return (0); 295 296 for(i = 0; i < __arraycount(bsd_to_linux_msg_flags_); i++) { 297 bfl = bsd_to_linux_msg_flags_[i].bfl; 298 lfl = bsd_to_linux_msg_flags_[i].lfl; 299 300 if (bfl <= 0) 301 continue; 302 303 if (bflag & bfl) { 304 if (lfl < 0) 305 return (-1); 306 307 lflag |= lfl; 308 } 309 } 310 311 return (lflag); 312 } 313 314 int 315 linux_sys_socket(struct lwp *l, const struct linux_sys_socket_args *uap, register_t *retval) 316 { 317 /* { 318 syscallarg(int) domain; 319 syscallarg(int) type; 320 syscallarg(int) protocol; 321 } */ 322 struct sys___socket30_args bsa; 323 int error; 324 325 326 SCARG(&bsa, protocol) = SCARG(uap, protocol); 327 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 328 if (SCARG(&bsa, domain) == -1) 329 return EINVAL; 330 SCARG(&bsa, type) = linux_to_bsd_type(SCARG(uap, type)); 331 if (SCARG(&bsa, type) == -1) 332 return EINVAL; 333 /* 334 * Apparently linux uses this to talk to ISDN sockets. If we fail 335 * now programs seems to handle it, but if we don't we are going 336 * to fail when we bind and programs don't handle this well. 337 */ 338 if (SCARG(&bsa, domain) == AF_ROUTE && SCARG(&bsa, type) == SOCK_RAW) 339 return ENOTSUP; 340 error = sys___socket30(l, &bsa, retval); 341 342 #ifdef INET6 343 /* 344 * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by 345 * default and some apps depend on this. So, set V6ONLY to 0 346 * for Linux apps if the sysctl value is set to 1. 347 */ 348 if (!error && ip6_v6only && SCARG(&bsa, domain) == PF_INET6) { 349 struct socket *so; 350 351 if (fd_getsock(*retval, &so) == 0) { 352 int val = 0; 353 354 /* ignore error */ 355 (void)so_setsockopt(l, so, IPPROTO_IPV6, IPV6_V6ONLY, 356 &val, sizeof(val)); 357 358 fd_putfile(*retval); 359 } 360 } 361 #endif 362 363 return (error); 364 } 365 366 int 367 linux_sys_socketpair(struct lwp *l, const struct linux_sys_socketpair_args *uap, register_t *retval) 368 { 369 /* { 370 syscallarg(int) domain; 371 syscallarg(int) type; 372 syscallarg(int) protocol; 373 syscallarg(int *) rsv; 374 } */ 375 struct sys_socketpair_args bsa; 376 377 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 378 if (SCARG(&bsa, domain) == -1) 379 return EINVAL; 380 SCARG(&bsa, type) = linux_to_bsd_type(SCARG(uap, type)); 381 if (SCARG(&bsa, type) == -1) 382 return EINVAL; 383 SCARG(&bsa, protocol) = SCARG(uap, protocol); 384 SCARG(&bsa, rsv) = SCARG(uap, rsv); 385 386 return sys_socketpair(l, &bsa, retval); 387 } 388 389 int 390 linux_sys_sendto(struct lwp *l, const struct linux_sys_sendto_args *uap, register_t *retval) 391 { 392 /* { 393 syscallarg(int) s; 394 syscallarg(void *) msg; 395 syscallarg(int) len; 396 syscallarg(int) flags; 397 syscallarg(struct osockaddr *) to; 398 syscallarg(int) tolen; 399 } */ 400 struct msghdr msg; 401 struct iovec aiov; 402 struct sockaddr_big nam; 403 int bflags; 404 int error; 405 406 /* Translate message flags. */ 407 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 408 if (bflags < 0) 409 /* Some supported flag */ 410 return EINVAL; 411 412 msg.msg_flags = 0; 413 msg.msg_name = NULL; 414 msg.msg_control = NULL; 415 416 if (SCARG(uap, tolen)) { 417 /* Read in and convert the sockaddr */ 418 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, to), 419 SCARG(uap, tolen)); 420 if (error) 421 return (error); 422 msg.msg_name = &nam; 423 msg.msg_namelen = SCARG(uap, tolen); 424 } 425 426 msg.msg_iov = &aiov; 427 msg.msg_iovlen = 1; 428 aiov.iov_base = __UNCONST(SCARG(uap, msg)); 429 aiov.iov_len = SCARG(uap, len); 430 431 return do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, 432 NULL, 0, retval); 433 } 434 435 static void 436 linux_to_bsd_msghdr(struct linux_msghdr *lmsg, struct msghdr *bmsg) 437 { 438 bmsg->msg_name = lmsg->msg_name; 439 bmsg->msg_namelen = lmsg->msg_namelen; 440 bmsg->msg_iov = lmsg->msg_iov; 441 bmsg->msg_iovlen = lmsg->msg_iovlen; 442 bmsg->msg_control = lmsg->msg_control; 443 bmsg->msg_controllen = lmsg->msg_controllen; 444 bmsg->msg_flags = lmsg->msg_flags; 445 } 446 447 static void 448 bsd_to_linux_msghdr(struct msghdr *bmsg, struct linux_msghdr *lmsg) 449 { 450 lmsg->msg_name = bmsg->msg_name; 451 lmsg->msg_namelen = bmsg->msg_namelen; 452 lmsg->msg_iov = bmsg->msg_iov; 453 lmsg->msg_iovlen = bmsg->msg_iovlen; 454 lmsg->msg_control = bmsg->msg_control; 455 lmsg->msg_controllen = bmsg->msg_controllen; 456 lmsg->msg_flags = bmsg->msg_flags; 457 } 458 459 int 460 linux_sys_sendmsg(struct lwp *l, const struct linux_sys_sendmsg_args *uap, register_t *retval) 461 { 462 /* { 463 syscallarg(int) s; 464 syscallarg(struct linux_msghdr *) msg; 465 syscallarg(u_int) flags; 466 } */ 467 struct msghdr msg; 468 struct linux_msghdr lmsg; 469 int error; 470 int bflags; 471 struct sockaddr_big nam; 472 u_int8_t *control; 473 struct mbuf *ctl_mbuf = NULL; 474 475 error = copyin(SCARG(uap, msg), &lmsg, sizeof(lmsg)); 476 if (error) 477 return error; 478 linux_to_bsd_msghdr(&lmsg, &msg); 479 480 msg.msg_flags = MSG_IOVUSRSPACE; 481 482 /* 483 * Translate message flags. 484 */ 485 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 486 if (bflags < 0) 487 /* Some supported flag */ 488 return EINVAL; 489 490 if (lmsg.msg_name) { 491 /* Read in and convert the sockaddr */ 492 error = linux_get_sa(l, SCARG(uap, s), &nam, msg.msg_name, 493 msg.msg_namelen); 494 if (error) 495 return (error); 496 msg.msg_name = &nam; 497 } 498 499 /* 500 * Handle cmsg if there is any. 501 */ 502 if (LINUX_CMSG_FIRSTHDR(&lmsg)) { 503 struct linux_cmsghdr l_cmsg, *l_cc; 504 struct cmsghdr *cmsg; 505 ssize_t resid = msg.msg_controllen; 506 size_t clen, cidx = 0, cspace; 507 508 ctl_mbuf = m_get(M_WAIT, MT_CONTROL); 509 clen = MLEN; 510 control = mtod(ctl_mbuf, void *); 511 512 l_cc = LINUX_CMSG_FIRSTHDR(&lmsg); 513 do { 514 error = copyin(l_cc, &l_cmsg, sizeof(l_cmsg)); 515 if (error) 516 goto done; 517 518 /* 519 * Sanity check the control message length. 520 */ 521 if (l_cmsg.cmsg_len > resid 522 || l_cmsg.cmsg_len < sizeof l_cmsg) { 523 error = EINVAL; 524 goto done; 525 } 526 527 /* 528 * Refuse unsupported control messages, and 529 * translate fields as appropriate. 530 */ 531 switch (l_cmsg.cmsg_level) { 532 case LINUX_SOL_SOCKET: 533 /* It only differs on some archs */ 534 if (LINUX_SOL_SOCKET != SOL_SOCKET) 535 l_cmsg.cmsg_level = SOL_SOCKET; 536 537 switch(l_cmsg.cmsg_type) { 538 case LINUX_SCM_RIGHTS: 539 /* Linux SCM_RIGHTS is same as NetBSD */ 540 break; 541 542 case LINUX_SCM_CREDENTIALS: 543 /* no native equivalent, just drop it */ 544 m_free(ctl_mbuf); 545 ctl_mbuf = NULL; 546 msg.msg_control = NULL; 547 msg.msg_controllen = 0; 548 goto skipcmsg; 549 550 default: 551 /* other types not supported */ 552 error = EINVAL; 553 goto done; 554 } 555 break; 556 default: 557 /* pray and leave intact */ 558 break; 559 } 560 561 cspace = CMSG_SPACE(l_cmsg.cmsg_len - sizeof(l_cmsg)); 562 563 /* Check the buffer is big enough */ 564 if (__predict_false(cidx + cspace > clen)) { 565 u_int8_t *nc; 566 567 clen = cidx + cspace; 568 if (clen >= PAGE_SIZE) { 569 error = EINVAL; 570 goto done; 571 } 572 nc = realloc(clen <= MLEN ? NULL : control, 573 clen, M_TEMP, M_WAITOK); 574 if (!nc) { 575 error = ENOMEM; 576 goto done; 577 } 578 if (cidx <= MLEN) 579 /* Old buffer was in mbuf... */ 580 memcpy(nc, control, cidx); 581 control = nc; 582 } 583 584 /* Copy header */ 585 cmsg = (void *)&control[cidx]; 586 cmsg->cmsg_len = l_cmsg.cmsg_len + LINUX_CMSG_ALIGN_DELTA; 587 cmsg->cmsg_level = l_cmsg.cmsg_level; 588 cmsg->cmsg_type = l_cmsg.cmsg_type; 589 590 /* Zero area between header and data */ 591 memset(cmsg + 1, 0, 592 CMSG_ALIGN(sizeof(*cmsg)) - sizeof(*cmsg)); 593 594 /* Copyin the data */ 595 error = copyin(LINUX_CMSG_DATA(l_cc), 596 CMSG_DATA(cmsg), 597 l_cmsg.cmsg_len - sizeof(l_cmsg)); 598 if (error) 599 goto done; 600 601 resid -= LINUX_CMSG_ALIGN(l_cmsg.cmsg_len); 602 cidx += cspace; 603 } while ((l_cc = LINUX_CMSG_NXTHDR(&msg, l_cc)) && resid > 0); 604 605 /* If we allocated a buffer, attach to mbuf */ 606 if (cidx > MLEN) { 607 MEXTADD(ctl_mbuf, control, clen, M_MBUF, NULL, NULL); 608 ctl_mbuf->m_flags |= M_EXT_RW; 609 } 610 control = NULL; 611 ctl_mbuf->m_len = cidx; 612 613 msg.msg_control = ctl_mbuf; 614 msg.msg_flags |= MSG_CONTROLMBUF; 615 616 ktrkuser("mbcontrol", mtod(ctl_mbuf, void *), 617 msg.msg_controllen); 618 } 619 620 skipcmsg: 621 error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, 622 NULL, 0, retval); 623 /* Freed internally */ 624 ctl_mbuf = NULL; 625 626 done: 627 if (ctl_mbuf != NULL) { 628 if (control != NULL && control != mtod(ctl_mbuf, void *)) 629 free(control, M_MBUF); 630 m_free(ctl_mbuf); 631 } 632 return (error); 633 } 634 635 int 636 linux_sys_recvfrom(struct lwp *l, const struct linux_sys_recvfrom_args *uap, register_t *retval) 637 { 638 /* { 639 syscallarg(int) s; 640 syscallarg(void *) buf; 641 syscallarg(int) len; 642 syscallarg(int) flags; 643 syscallarg(struct osockaddr *) from; 644 syscallarg(int *) fromlenaddr; 645 } */ 646 int error; 647 struct sys_recvfrom_args bra; 648 649 SCARG(&bra, s) = SCARG(uap, s); 650 SCARG(&bra, buf) = SCARG(uap, buf); 651 SCARG(&bra, len) = SCARG(uap, len); 652 SCARG(&bra, flags) = SCARG(uap, flags); 653 SCARG(&bra, from) = (struct sockaddr *) SCARG(uap, from); 654 SCARG(&bra, fromlenaddr) = (socklen_t *)SCARG(uap, fromlenaddr); 655 656 if ((error = sys_recvfrom(l, &bra, retval))) 657 return (error); 658 659 if (SCARG(uap, from) && (error = linux_sa_put(SCARG(uap, from)))) 660 return (error); 661 662 return (0); 663 } 664 665 static int 666 linux_copyout_msg_control(struct lwp *l, struct msghdr *mp, struct mbuf *control) 667 { 668 int dlen, error = 0; 669 struct cmsghdr *cmsg; 670 struct linux_cmsghdr linux_cmsg; 671 struct mbuf *m; 672 char *q, *q_end; 673 674 if (mp->msg_controllen <= 0 || control == 0) { 675 mp->msg_controllen = 0; 676 free_control_mbuf(l, control, control); 677 return 0; 678 } 679 680 ktrkuser("msgcontrol", mtod(control, void *), mp->msg_controllen); 681 682 q = (char *)mp->msg_control; 683 q_end = q + mp->msg_controllen; 684 685 for (m = control; m != NULL; ) { 686 cmsg = mtod(m, struct cmsghdr *); 687 688 /* 689 * Fixup cmsg. We handle two things: 690 * 0. different sizeof cmsg_len. 691 * 1. different values for level/type on some archs 692 * 2. different alignment of CMSG_DATA on some archs 693 */ 694 linux_cmsg.cmsg_len = cmsg->cmsg_len - LINUX_CMSG_ALIGN_DELTA; 695 linux_cmsg.cmsg_level = cmsg->cmsg_level; 696 linux_cmsg.cmsg_type = cmsg->cmsg_type; 697 698 dlen = q_end - q; 699 if (linux_cmsg.cmsg_len > dlen) { 700 /* Not enough room for the parameter */ 701 dlen -= sizeof linux_cmsg; 702 if (dlen <= 0) 703 /* Discard if header wont fit */ 704 break; 705 mp->msg_flags |= MSG_CTRUNC; 706 if (linux_cmsg.cmsg_level == SOL_SOCKET 707 && linux_cmsg.cmsg_type == SCM_RIGHTS) 708 /* Do not truncate me ... */ 709 break; 710 } else 711 dlen = linux_cmsg.cmsg_len - sizeof linux_cmsg; 712 713 switch (linux_cmsg.cmsg_level) { 714 case SOL_SOCKET: 715 linux_cmsg.cmsg_level = LINUX_SOL_SOCKET; 716 switch (linux_cmsg.cmsg_type) { 717 case SCM_RIGHTS: 718 /* Linux SCM_RIGHTS is same as NetBSD */ 719 break; 720 721 default: 722 /* other types not supported */ 723 error = EINVAL; 724 goto done; 725 } 726 /* machine dependent ! */ 727 break; 728 default: 729 /* pray and leave intact */ 730 break; 731 } 732 733 /* There can be padding between the header and data... */ 734 error = copyout(&linux_cmsg, q, sizeof linux_cmsg); 735 if (error != 0) { 736 error = copyout(CCMSG_DATA(cmsg), q + sizeof linux_cmsg, 737 dlen); 738 } 739 if (error != 0) { 740 /* We must free all the SCM_RIGHTS */ 741 m = control; 742 break; 743 } 744 m = m->m_next; 745 if (m == NULL || q + LINUX_CMSG_SPACE(dlen) > q_end) { 746 q += LINUX_CMSG_LEN(dlen); 747 break; 748 } 749 q += LINUX_CMSG_SPACE(dlen); 750 } 751 752 done: 753 free_control_mbuf(l, control, m); 754 755 mp->msg_controllen = q - (char *)mp->msg_control; 756 return error; 757 } 758 759 int 760 linux_sys_recvmsg(struct lwp *l, const struct linux_sys_recvmsg_args *uap, register_t *retval) 761 { 762 /* { 763 syscallarg(int) s; 764 syscallarg(struct linux_msghdr *) msg; 765 syscallarg(u_int) flags; 766 } */ 767 struct msghdr msg; 768 struct linux_msghdr lmsg; 769 int error; 770 struct mbuf *from, *control; 771 772 error = copyin(SCARG(uap, msg), &lmsg, sizeof(lmsg)); 773 if (error) 774 return (error); 775 linux_to_bsd_msghdr(&lmsg, &msg); 776 777 msg.msg_flags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 778 if (msg.msg_flags < 0) { 779 /* Some unsupported flag */ 780 return (EINVAL); 781 } 782 msg.msg_flags |= MSG_IOVUSRSPACE; 783 784 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, NULL, 0, &from, 785 msg.msg_control != NULL ? &control : NULL, retval); 786 if (error != 0) 787 return error; 788 789 if (msg.msg_control != NULL) 790 error = linux_copyout_msg_control(l, &msg, control); 791 792 if (error == 0 && from != 0) { 793 mtod(from, struct osockaddr *)->sa_family = 794 bsd_to_linux_domain(mtod(from, struct sockaddr *)->sa_family); 795 error = copyout_sockname(msg.msg_name, &msg.msg_namelen, 0, 796 from); 797 } else 798 msg.msg_namelen = 0; 799 800 if (from != NULL) 801 m_free(from); 802 803 if (error == 0) { 804 msg.msg_flags = bsd_to_linux_msg_flags(msg.msg_flags); 805 if (msg.msg_flags < 0) 806 /* Some flag unsupported by Linux */ 807 error = EINVAL; 808 else { 809 ktrkuser("msghdr", &msg, sizeof(msg)); 810 bsd_to_linux_msghdr(&msg, &lmsg); 811 error = copyout(&lmsg, SCARG(uap, msg), sizeof(lmsg)); 812 } 813 } 814 815 return (error); 816 } 817 818 /* 819 * Convert socket option level from Linux to NetBSD value. Only SOL_SOCKET 820 * is different, the rest matches IPPROTO_* on both systems. 821 */ 822 int 823 linux_to_bsd_sopt_level(int llevel) 824 { 825 826 switch (llevel) { 827 case LINUX_SOL_SOCKET: 828 return SOL_SOCKET; 829 case LINUX_SOL_IP: 830 return IPPROTO_IP; 831 #ifdef INET6 832 case LINUX_SOL_IPV6: 833 return IPPROTO_IPV6; 834 #endif 835 case LINUX_SOL_TCP: 836 return IPPROTO_TCP; 837 case LINUX_SOL_UDP: 838 return IPPROTO_UDP; 839 default: 840 return -1; 841 } 842 } 843 844 /* 845 * Convert Linux socket level socket option numbers to NetBSD values. 846 */ 847 int 848 linux_to_bsd_so_sockopt(int lopt) 849 { 850 851 switch (lopt) { 852 case LINUX_SO_DEBUG: 853 return SO_DEBUG; 854 case LINUX_SO_REUSEADDR: 855 /* 856 * Linux does not implement SO_REUSEPORT, but allows reuse of a 857 * host:port pair through SO_REUSEADDR even if the address is not a 858 * multicast-address. Effectively, this means that we should use 859 * SO_REUSEPORT to allow Linux applications to not exit with 860 * EADDRINUSE 861 */ 862 return SO_REUSEPORT; 863 case LINUX_SO_TYPE: 864 return SO_TYPE; 865 case LINUX_SO_ERROR: 866 return SO_ERROR; 867 case LINUX_SO_DONTROUTE: 868 return SO_DONTROUTE; 869 case LINUX_SO_BROADCAST: 870 return SO_BROADCAST; 871 case LINUX_SO_SNDBUF: 872 return SO_SNDBUF; 873 case LINUX_SO_RCVBUF: 874 return SO_RCVBUF; 875 case LINUX_SO_SNDLOWAT: 876 return SO_SNDLOWAT; 877 case LINUX_SO_RCVLOWAT: 878 return SO_RCVLOWAT; 879 case LINUX_SO_KEEPALIVE: 880 return SO_KEEPALIVE; 881 case LINUX_SO_OOBINLINE: 882 return SO_OOBINLINE; 883 case LINUX_SO_LINGER: 884 return SO_LINGER; 885 case LINUX_SO_ACCEPTCONN: 886 return SO_ACCEPTCONN; 887 case LINUX_SO_PRIORITY: 888 case LINUX_SO_NO_CHECK: 889 default: 890 return -1; 891 } 892 } 893 894 /* 895 * Convert Linux IP level socket option number to NetBSD values. 896 */ 897 int 898 linux_to_bsd_ip_sockopt(int lopt) 899 { 900 901 switch (lopt) { 902 case LINUX_IP_TOS: 903 return IP_TOS; 904 case LINUX_IP_TTL: 905 return IP_TTL; 906 case LINUX_IP_HDRINCL: 907 return IP_HDRINCL; 908 case LINUX_IP_MULTICAST_TTL: 909 return IP_MULTICAST_TTL; 910 case LINUX_IP_MULTICAST_LOOP: 911 return IP_MULTICAST_LOOP; 912 case LINUX_IP_MULTICAST_IF: 913 return IP_MULTICAST_IF; 914 case LINUX_IP_ADD_MEMBERSHIP: 915 return IP_ADD_MEMBERSHIP; 916 case LINUX_IP_DROP_MEMBERSHIP: 917 return IP_DROP_MEMBERSHIP; 918 default: 919 return -1; 920 } 921 } 922 923 /* 924 * Convert Linux IPV6 level socket option number to NetBSD values. 925 */ 926 #ifdef INET6 927 int 928 linux_to_bsd_ipv6_sockopt(int lopt) 929 { 930 931 switch (lopt) { 932 case LINUX_IPV6_V6ONLY: 933 return IPV6_V6ONLY; 934 default: 935 return -1; 936 } 937 } 938 #endif 939 940 /* 941 * Convert Linux TCP level socket option number to NetBSD values. 942 */ 943 int 944 linux_to_bsd_tcp_sockopt(int lopt) 945 { 946 947 switch (lopt) { 948 case LINUX_TCP_NODELAY: 949 return TCP_NODELAY; 950 case LINUX_TCP_MAXSEG: 951 return TCP_MAXSEG; 952 default: 953 return -1; 954 } 955 } 956 957 /* 958 * Convert Linux UDP level socket option number to NetBSD values. 959 */ 960 int 961 linux_to_bsd_udp_sockopt(int lopt) 962 { 963 964 switch (lopt) { 965 default: 966 return -1; 967 } 968 } 969 970 /* 971 * Another reasonably straightforward function: setsockopt(2). 972 * The level and option numbers are converted; the values passed 973 * are not (yet) converted, the ones currently implemented don't 974 * need conversion, as they are the same on both systems. 975 */ 976 int 977 linux_sys_setsockopt(struct lwp *l, const struct linux_sys_setsockopt_args *uap, register_t *retval) 978 { 979 /* { 980 syscallarg(int) s; 981 syscallarg(int) level; 982 syscallarg(int) optname; 983 syscallarg(void *) optval; 984 syscallarg(int) optlen; 985 } */ 986 struct sys_setsockopt_args bsa; 987 int name; 988 989 SCARG(&bsa, s) = SCARG(uap, s); 990 SCARG(&bsa, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 991 SCARG(&bsa, val) = SCARG(uap, optval); 992 SCARG(&bsa, valsize) = SCARG(uap, optlen); 993 994 /* 995 * Linux supports only SOL_SOCKET for AF_LOCAL domain sockets 996 * and returns EOPNOTSUPP for other levels 997 */ 998 if (SCARG(&bsa, level) != SOL_SOCKET) { 999 struct socket *so; 1000 int error, family; 1001 1002 /* fd_getsock() will use the descriptor for us */ 1003 if ((error = fd_getsock(SCARG(&bsa, s), &so)) != 0) 1004 return error; 1005 family = so->so_proto->pr_domain->dom_family; 1006 fd_putfile(SCARG(&bsa, s)); 1007 1008 if (family == AF_LOCAL) 1009 return EOPNOTSUPP; 1010 } 1011 1012 switch (SCARG(&bsa, level)) { 1013 case SOL_SOCKET: 1014 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 1015 break; 1016 case IPPROTO_IP: 1017 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 1018 break; 1019 #ifdef INET6 1020 case IPPROTO_IPV6: 1021 name = linux_to_bsd_ipv6_sockopt(SCARG(uap, optname)); 1022 break; 1023 #endif 1024 case IPPROTO_TCP: 1025 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 1026 break; 1027 case IPPROTO_UDP: 1028 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 1029 break; 1030 default: 1031 return EINVAL; 1032 } 1033 1034 if (name == -1) 1035 return EINVAL; 1036 SCARG(&bsa, name) = name; 1037 1038 return sys_setsockopt(l, &bsa, retval); 1039 } 1040 1041 /* 1042 * getsockopt(2) is very much the same as setsockopt(2) (see above) 1043 */ 1044 int 1045 linux_sys_getsockopt(struct lwp *l, const struct linux_sys_getsockopt_args *uap, register_t *retval) 1046 { 1047 /* { 1048 syscallarg(int) s; 1049 syscallarg(int) level; 1050 syscallarg(int) optname; 1051 syscallarg(void *) optval; 1052 syscallarg(int *) optlen; 1053 } */ 1054 struct sys_getsockopt_args bga; 1055 int name; 1056 1057 SCARG(&bga, s) = SCARG(uap, s); 1058 SCARG(&bga, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 1059 SCARG(&bga, val) = SCARG(uap, optval); 1060 SCARG(&bga, avalsize) = (socklen_t *)SCARG(uap, optlen); 1061 1062 switch (SCARG(&bga, level)) { 1063 case SOL_SOCKET: 1064 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 1065 break; 1066 case IPPROTO_IP: 1067 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 1068 break; 1069 #ifdef INET6 1070 case IPPROTO_IPV6: 1071 name = linux_to_bsd_ipv6_sockopt(SCARG(uap, optname)); 1072 break; 1073 #endif 1074 case IPPROTO_TCP: 1075 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 1076 break; 1077 case IPPROTO_UDP: 1078 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 1079 break; 1080 default: 1081 return EINVAL; 1082 } 1083 1084 if (name == -1) 1085 return EINVAL; 1086 SCARG(&bga, name) = name; 1087 1088 return sys_getsockopt(l, &bga, retval); 1089 } 1090 1091 int 1092 linux_getifname(struct lwp *l, register_t *retval, void *data) 1093 { 1094 struct ifnet *ifp; 1095 struct linux_ifreq ifr; 1096 int error; 1097 int s; 1098 1099 error = copyin(data, &ifr, sizeof(ifr)); 1100 if (error) 1101 return error; 1102 1103 s = pserialize_read_enter(); 1104 ifp = if_byindex(ifr.ifr_ifru.ifru_ifindex); 1105 if (ifp == NULL) { 1106 pserialize_read_exit(s); 1107 return ENODEV; 1108 } 1109 1110 strncpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)); 1111 pserialize_read_exit(s); 1112 1113 return copyout(&ifr, data, sizeof(ifr)); 1114 } 1115 1116 int 1117 linux_getifconf(struct lwp *l, register_t *retval, void *data) 1118 { 1119 struct linux_ifreq ifr, *ifrp = NULL; 1120 struct linux_ifconf ifc; 1121 struct ifnet *ifp; 1122 struct sockaddr *sa; 1123 struct osockaddr *osa; 1124 int space = 0, error; 1125 const int sz = (int)sizeof(ifr); 1126 bool docopy; 1127 int s; 1128 int bound; 1129 struct psref psref; 1130 1131 error = copyin(data, &ifc, sizeof(ifc)); 1132 if (error) 1133 return error; 1134 1135 docopy = ifc.ifc_req != NULL; 1136 if (docopy) { 1137 space = ifc.ifc_len; 1138 ifrp = ifc.ifc_req; 1139 } 1140 1141 bound = curlwp_bind(); 1142 s = pserialize_read_enter(); 1143 IFNET_READER_FOREACH(ifp) { 1144 struct ifaddr *ifa; 1145 psref_acquire(&psref, &ifp->if_psref, ifnet_psref_class); 1146 1147 (void)strncpy(ifr.ifr_name, ifp->if_xname, 1148 sizeof(ifr.ifr_name)); 1149 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') { 1150 error = ENAMETOOLONG; 1151 goto release_exit; 1152 } 1153 1154 IFADDR_READER_FOREACH(ifa, ifp) { 1155 struct psref psref_ifa; 1156 ifa_acquire(ifa, &psref_ifa); 1157 pserialize_read_exit(s); 1158 1159 sa = ifa->ifa_addr; 1160 if (sa->sa_family != AF_INET || 1161 sa->sa_len > sizeof(*osa)) 1162 goto next; 1163 memcpy(&ifr.ifr_addr, sa, sa->sa_len); 1164 osa = (struct osockaddr *)&ifr.ifr_addr; 1165 osa->sa_family = sa->sa_family; 1166 if (space >= sz) { 1167 error = copyout(&ifr, ifrp, sz); 1168 if (error != 0) { 1169 s = pserialize_read_enter(); 1170 ifa_release(ifa, &psref_ifa); 1171 goto release_exit; 1172 } 1173 ifrp++; 1174 } 1175 space -= sz; 1176 next: 1177 s = pserialize_read_enter(); 1178 ifa_release(ifa, &psref_ifa); 1179 } 1180 1181 psref_release(&psref, &ifp->if_psref, ifnet_psref_class); 1182 } 1183 pserialize_read_exit(s); 1184 curlwp_bindx(bound); 1185 1186 if (docopy) 1187 ifc.ifc_len -= space; 1188 else 1189 ifc.ifc_len = -space; 1190 1191 return copyout(&ifc, data, sizeof(ifc)); 1192 1193 release_exit: 1194 pserialize_read_exit(s); 1195 psref_release(&psref, &ifp->if_psref, ifnet_psref_class); 1196 curlwp_bindx(bound); 1197 return error; 1198 } 1199 1200 int 1201 linux_getifhwaddr(struct lwp *l, register_t *retval, u_int fd, 1202 void *data) 1203 { 1204 /* Not the full structure, just enough to map what we do here */ 1205 struct linux_ifreq lreq; 1206 file_t *fp; 1207 struct ifaddr *ifa; 1208 struct ifnet *ifp; 1209 struct sockaddr_dl *sadl; 1210 int error, found; 1211 int index, ifnum; 1212 int s; 1213 1214 /* 1215 * We can't emulate this ioctl by calling sys_ioctl() to run 1216 * SIOCGIFCONF, because the user buffer is not of the right 1217 * type to take those results. We can't use kernel buffers to 1218 * receive the results, as the implementation of sys_ioctl() 1219 * and ifconf() [which implements SIOCGIFCONF] use 1220 * copyin()/copyout() which will fail on kernel addresses. 1221 * 1222 * So, we must duplicate code from sys_ioctl() and ifconf(). Ugh. 1223 */ 1224 1225 if ((fp = fd_getfile(fd)) == NULL) 1226 return (EBADF); 1227 1228 KERNEL_LOCK(1, NULL); 1229 1230 if ((fp->f_flag & (FREAD | FWRITE)) == 0) { 1231 error = EBADF; 1232 goto out; 1233 } 1234 1235 error = copyin(data, &lreq, sizeof(lreq)); 1236 if (error) 1237 goto out; 1238 lreq.ifr_name[LINUX_IFNAMSIZ-1] = '\0'; /* just in case */ 1239 1240 /* 1241 * Try real interface name first, then fake "ethX" 1242 */ 1243 found = 0; 1244 s = pserialize_read_enter(); 1245 IFNET_READER_FOREACH(ifp) { 1246 if (found) 1247 break; 1248 if (strcmp(lreq.ifr_name, ifp->if_xname)) 1249 /* not this interface */ 1250 continue; 1251 1252 found=1; 1253 if (IFADDR_READER_EMPTY(ifp)) { 1254 pserialize_read_exit(s); 1255 error = ENODEV; 1256 goto out; 1257 } 1258 IFADDR_READER_FOREACH(ifa, ifp) { 1259 sadl = satosdl(ifa->ifa_addr); 1260 /* only return ethernet addresses */ 1261 /* XXX what about FDDI, etc. ? */ 1262 if (sadl->sdl_family != AF_LINK || 1263 sadl->sdl_type != IFT_ETHER) 1264 continue; 1265 memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl), 1266 MIN(sadl->sdl_alen, 1267 sizeof(lreq.ifr_hwaddr.sa_data))); 1268 lreq.ifr_hwaddr.sa_family = 1269 sadl->sdl_family; 1270 pserialize_read_exit(s); 1271 1272 error = copyout(&lreq, data, sizeof(lreq)); 1273 goto out; 1274 } 1275 } 1276 pserialize_read_exit(s); 1277 1278 if (strncmp(lreq.ifr_name, "eth", 3) != 0) { 1279 /* unknown interface, not even an "eth*" name */ 1280 error = ENODEV; 1281 goto out; 1282 } 1283 1284 for (ifnum = 0, index = 3; 1285 index < LINUX_IFNAMSIZ && lreq.ifr_name[index] != '\0'; 1286 index++) { 1287 ifnum *= 10; 1288 ifnum += lreq.ifr_name[index] - '0'; 1289 } 1290 1291 error = EINVAL; /* in case we don't find one */ 1292 s = pserialize_read_enter(); 1293 IFNET_READER_FOREACH(ifp) { 1294 memcpy(lreq.ifr_name, ifp->if_xname, 1295 MIN(LINUX_IFNAMSIZ, IFNAMSIZ)); 1296 IFADDR_READER_FOREACH(ifa, ifp) { 1297 sadl = satosdl(ifa->ifa_addr); 1298 /* only return ethernet addresses */ 1299 /* XXX what about FDDI, etc. ? */ 1300 if (sadl->sdl_family != AF_LINK || 1301 sadl->sdl_type != IFT_ETHER) 1302 continue; 1303 if (ifnum--) 1304 /* not the reqested iface */ 1305 continue; 1306 memcpy(&lreq.ifr_hwaddr.sa_data, 1307 CLLADDR(sadl), 1308 MIN(sadl->sdl_alen, 1309 sizeof(lreq.ifr_hwaddr.sa_data))); 1310 lreq.ifr_hwaddr.sa_family = 1311 sadl->sdl_family; 1312 pserialize_read_exit(s); 1313 1314 error = copyout(&lreq, data, sizeof(lreq)); 1315 goto out; 1316 } 1317 } 1318 pserialize_read_exit(s); 1319 1320 out: 1321 KERNEL_UNLOCK_ONE(NULL); 1322 fd_putfile(fd); 1323 return error; 1324 } 1325 1326 int 1327 linux_ioctl_socket(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 1328 { 1329 /* { 1330 syscallarg(int) fd; 1331 syscallarg(u_long) com; 1332 syscallarg(void *) data; 1333 } */ 1334 u_long com; 1335 int error = 0, isdev = 0, dosys = 1; 1336 struct sys_ioctl_args ia; 1337 file_t *fp; 1338 struct vnode *vp; 1339 int (*ioctlf)(file_t *, u_long, void *); 1340 struct ioctl_pt pt; 1341 1342 if ((fp = fd_getfile(SCARG(uap, fd))) == NULL) 1343 return (EBADF); 1344 1345 if (fp->f_type == DTYPE_VNODE) { 1346 vp = (struct vnode *)fp->f_data; 1347 isdev = vp->v_type == VCHR; 1348 } 1349 1350 /* 1351 * Don't try to interpret socket ioctl calls that are done 1352 * on a device filedescriptor, just pass them through, to 1353 * emulate Linux behaviour. Use PTIOCLINUX so that the 1354 * device will only handle these if it's prepared to do 1355 * so, to avoid unexpected things from happening. 1356 */ 1357 if (isdev) { 1358 dosys = 0; 1359 ioctlf = fp->f_ops->fo_ioctl; 1360 pt.com = SCARG(uap, com); 1361 pt.data = SCARG(uap, data); 1362 error = ioctlf(fp, PTIOCLINUX, &pt); 1363 /* 1364 * XXX hack: if the function returns EJUSTRETURN, 1365 * it has stuffed a sysctl return value in pt.data. 1366 */ 1367 if (error == EJUSTRETURN) { 1368 retval[0] = (register_t)pt.data; 1369 error = 0; 1370 } 1371 goto out; 1372 } 1373 1374 com = SCARG(uap, com); 1375 retval[0] = 0; 1376 1377 switch (com) { 1378 case LINUX_SIOCGIFNAME: 1379 error = linux_getifname(l, retval, SCARG(uap, data)); 1380 dosys = 0; 1381 break; 1382 case LINUX_SIOCGIFCONF: 1383 error = linux_getifconf(l, retval, SCARG(uap, data)); 1384 dosys = 0; 1385 break; 1386 case LINUX_SIOCGIFFLAGS: 1387 SCARG(&ia, com) = OSIOCGIFFLAGS; 1388 break; 1389 case LINUX_SIOCSIFFLAGS: 1390 SCARG(&ia, com) = OSIOCSIFFLAGS; 1391 break; 1392 case LINUX_SIOCGIFADDR: 1393 SCARG(&ia, com) = OOSIOCGIFADDR; 1394 break; 1395 case LINUX_SIOCGIFDSTADDR: 1396 SCARG(&ia, com) = OOSIOCGIFDSTADDR; 1397 break; 1398 case LINUX_SIOCGIFBRDADDR: 1399 SCARG(&ia, com) = OOSIOCGIFBRDADDR; 1400 break; 1401 case LINUX_SIOCGIFNETMASK: 1402 SCARG(&ia, com) = OOSIOCGIFNETMASK; 1403 break; 1404 case LINUX_SIOCGIFMTU: 1405 SCARG(&ia, com) = OSIOCGIFMTU; 1406 break; 1407 case LINUX_SIOCADDMULTI: 1408 SCARG(&ia, com) = OSIOCADDMULTI; 1409 break; 1410 case LINUX_SIOCDELMULTI: 1411 SCARG(&ia, com) = OSIOCDELMULTI; 1412 break; 1413 case LINUX_SIOCGIFHWADDR: 1414 error = linux_getifhwaddr(l, retval, SCARG(uap, fd), 1415 SCARG(uap, data)); 1416 dosys = 0; 1417 break; 1418 default: 1419 error = EINVAL; 1420 } 1421 1422 out: 1423 fd_putfile(SCARG(uap, fd)); 1424 1425 if (error ==0 && dosys) { 1426 SCARG(&ia, fd) = SCARG(uap, fd); 1427 SCARG(&ia, data) = SCARG(uap, data); 1428 error = sys_ioctl(curlwp, &ia, retval); 1429 } 1430 1431 return error; 1432 } 1433 1434 int 1435 linux_sys_connect(struct lwp *l, const struct linux_sys_connect_args *uap, register_t *retval) 1436 { 1437 /* { 1438 syscallarg(int) s; 1439 syscallarg(const struct sockaddr *) name; 1440 syscallarg(int) namelen; 1441 } */ 1442 int error; 1443 struct sockaddr_big sb; 1444 1445 error = linux_get_sa(l, SCARG(uap, s), &sb, SCARG(uap, name), 1446 SCARG(uap, namelen)); 1447 if (error) 1448 return (error); 1449 1450 error = do_sys_connect(l, SCARG(uap, s), (struct sockaddr *)&sb); 1451 1452 if (error == EISCONN) { 1453 struct socket *so; 1454 int state, prflags; 1455 1456 /* fd_getsock() will use the descriptor for us */ 1457 if (fd_getsock(SCARG(uap, s), &so) != 0) 1458 return EISCONN; 1459 1460 solock(so); 1461 state = so->so_state; 1462 prflags = so->so_proto->pr_flags; 1463 sounlock(so); 1464 fd_putfile(SCARG(uap, s)); 1465 /* 1466 * We should only let this call succeed once per 1467 * non-blocking connect; however we don't have 1468 * a convenient place to keep that state.. 1469 */ 1470 if ((state & (SS_ISCONNECTED|SS_NBIO)) == 1471 (SS_ISCONNECTED|SS_NBIO) && 1472 (prflags & PR_CONNREQUIRED)) 1473 return 0; 1474 } 1475 1476 return (error); 1477 } 1478 1479 int 1480 linux_sys_bind(struct lwp *l, const struct linux_sys_bind_args *uap, register_t *retval) 1481 { 1482 /* { 1483 syscallarg(int) s; 1484 syscallarg(const struct osockaddr *) name; 1485 syscallarg(int) namelen; 1486 } */ 1487 int error; 1488 struct sockaddr_big sb; 1489 1490 error = linux_get_sa(l, SCARG(uap, s), &sb, SCARG(uap, name), 1491 SCARG(uap, namelen)); 1492 if (error) 1493 return (error); 1494 1495 return do_sys_bind(l, SCARG(uap, s), (struct sockaddr *)&sb); 1496 } 1497 1498 int 1499 linux_sys_getsockname(struct lwp *l, const struct linux_sys_getsockname_args *uap, register_t *retval) 1500 { 1501 /* { 1502 syscallarg(int) fdes; 1503 syscallarg(void *) asa; 1504 syscallarg(int *) alen; 1505 } */ 1506 int error; 1507 1508 if ((error = sys_getsockname(l, (const void *)uap, retval)) != 0) 1509 return (error); 1510 1511 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1512 return (error); 1513 1514 return (0); 1515 } 1516 1517 int 1518 linux_sys_getpeername(struct lwp *l, const struct linux_sys_getpeername_args *uap, register_t *retval) 1519 { 1520 /* { 1521 syscallarg(int) fdes; 1522 syscallarg(void *) asa; 1523 syscallarg(int *) alen; 1524 } */ 1525 int error; 1526 1527 if ((error = sys_getpeername(l, (const void *)uap, retval)) != 0) 1528 return (error); 1529 1530 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1531 return (error); 1532 1533 return (0); 1534 } 1535 1536 /* 1537 * Copy the osockaddr structure pointed to by name to sb, adjust 1538 * family and convert to sockaddr. 1539 */ 1540 static int 1541 linux_get_sa(struct lwp *l, int s, struct sockaddr_big *sb, 1542 const struct osockaddr *name, socklen_t namelen) 1543 { 1544 int error, bdom; 1545 1546 if (namelen > UCHAR_MAX || 1547 namelen <= offsetof(struct sockaddr_big, sb_data)) 1548 return EINVAL; 1549 1550 error = copyin(name, sb, namelen); 1551 if (error) 1552 return error; 1553 1554 bdom = linux_to_bsd_domain(sb->sb_family); 1555 if (bdom == -1) 1556 return EINVAL; 1557 1558 /* 1559 * If the family is unspecified, use address family of the socket. 1560 * This avoid triggering strict family checks in netinet/in_pcb.c et.al. 1561 */ 1562 if (bdom == AF_UNSPEC) { 1563 struct socket *so; 1564 1565 /* fd_getsock() will use the descriptor for us */ 1566 if ((error = fd_getsock(s, &so)) != 0) 1567 return error; 1568 1569 bdom = so->so_proto->pr_domain->dom_family; 1570 fd_putfile(s); 1571 } 1572 1573 /* 1574 * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6, 1575 * which lacks the scope id compared with RFC2553 one. If we detect 1576 * the situation, reject the address and write a message to system log. 1577 * 1578 * Still accept addresses for which the scope id is not used. 1579 */ 1580 if (bdom == AF_INET6 && 1581 namelen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) { 1582 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sb; 1583 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) && 1584 (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1585 IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) || 1586 IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) || 1587 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 1588 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) { 1589 struct proc *p = l->l_proc; 1590 int uid = l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1; 1591 1592 log(LOG_DEBUG, 1593 "pid %d (%s), uid %d: obsolete pre-RFC2553 " 1594 "sockaddr_in6 rejected", 1595 p->p_pid, p->p_comm, uid); 1596 return EINVAL; 1597 } 1598 namelen = sizeof(struct sockaddr_in6); 1599 sin6->sin6_scope_id = 0; 1600 } 1601 1602 if (bdom == AF_INET) 1603 namelen = sizeof(struct sockaddr_in); 1604 1605 sb->sb_family = bdom; 1606 sb->sb_len = namelen; 1607 ktrkuser("mbsoname", sb, namelen); 1608 return 0; 1609 } 1610 1611 static int 1612 linux_sa_put(struct osockaddr *osa) 1613 { 1614 struct sockaddr sa; 1615 struct osockaddr *kosa; 1616 int error, bdom, len; 1617 1618 /* 1619 * Only read/write the sockaddr family and length part, the rest is 1620 * not changed. 1621 */ 1622 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 1623 1624 error = copyin(osa, &sa, len); 1625 if (error) 1626 return (error); 1627 1628 bdom = bsd_to_linux_domain(sa.sa_family); 1629 if (bdom == -1) 1630 return (EINVAL); 1631 1632 /* Note: we convert from sockaddr to osockaddr here, too */ 1633 kosa = (struct osockaddr *) &sa; 1634 kosa->sa_family = bdom; 1635 error = copyout(kosa, osa, len); 1636 if (error) 1637 return (error); 1638 1639 return (0); 1640 } 1641 1642 #ifndef __amd64__ 1643 int 1644 linux_sys_recv(struct lwp *l, const struct linux_sys_recv_args *uap, register_t *retval) 1645 { 1646 /* { 1647 syscallarg(int) s; 1648 syscallarg(void *) buf; 1649 syscallarg(int) len; 1650 syscallarg(int) flags; 1651 } */ 1652 struct sys_recvfrom_args bra; 1653 1654 1655 SCARG(&bra, s) = SCARG(uap, s); 1656 SCARG(&bra, buf) = SCARG(uap, buf); 1657 SCARG(&bra, len) = (size_t) SCARG(uap, len); 1658 SCARG(&bra, flags) = SCARG(uap, flags); 1659 SCARG(&bra, from) = NULL; 1660 SCARG(&bra, fromlenaddr) = NULL; 1661 1662 return (sys_recvfrom(l, &bra, retval)); 1663 } 1664 1665 int 1666 linux_sys_send(struct lwp *l, const struct linux_sys_send_args *uap, register_t *retval) 1667 { 1668 /* { 1669 syscallarg(int) s; 1670 syscallarg(void *) buf; 1671 syscallarg(int) len; 1672 syscallarg(int) flags; 1673 } */ 1674 struct sys_sendto_args bsa; 1675 1676 SCARG(&bsa, s) = SCARG(uap, s); 1677 SCARG(&bsa, buf) = SCARG(uap, buf); 1678 SCARG(&bsa, len) = SCARG(uap, len); 1679 SCARG(&bsa, flags) = SCARG(uap, flags); 1680 SCARG(&bsa, to) = NULL; 1681 SCARG(&bsa, tolen) = 0; 1682 1683 return (sys_sendto(l, &bsa, retval)); 1684 } 1685 #endif 1686 1687 int 1688 linux_sys_accept(struct lwp *l, const struct linux_sys_accept_args *uap, register_t *retval) 1689 { 1690 /* { 1691 syscallarg(int) s; 1692 syscallarg(struct osockaddr *) name; 1693 syscallarg(int *) anamelen; 1694 } */ 1695 int error; 1696 struct sys_accept_args baa; 1697 1698 SCARG(&baa, s) = SCARG(uap, s); 1699 SCARG(&baa, name) = (struct sockaddr *) SCARG(uap, name); 1700 SCARG(&baa, anamelen) = (unsigned int *) SCARG(uap, anamelen); 1701 1702 if ((error = sys_accept(l, &baa, retval))) 1703 return (error); 1704 1705 if (SCARG(uap, name) && (error = linux_sa_put(SCARG(uap, name)))) 1706 return (error); 1707 1708 return (0); 1709 } 1710