1 /* $NetBSD: linux_socket.c,v 1.100 2009/06/11 19:57:58 njoly 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 1.100 2009/06/11 19:57:58 njoly 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/malloc.h> 49 #include <sys/ioctl.h> 50 #include <sys/tty.h> 51 #include <sys/file.h> 52 #include <sys/filedesc.h> 53 #include <sys/select.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/domain.h> 57 #include <net/if.h> 58 #include <net/if_dl.h> 59 #include <net/if_types.h> 60 #include <netinet/in.h> 61 #include <netinet/tcp.h> 62 #include <sys/mount.h> 63 #include <sys/proc.h> 64 #include <sys/vnode.h> 65 #include <sys/device.h> 66 #include <sys/protosw.h> 67 #include <sys/mbuf.h> 68 #include <sys/syslog.h> 69 #include <sys/exec.h> 70 #include <sys/kauth.h> 71 #include <sys/syscallargs.h> 72 #include <sys/ktrace.h> 73 74 #include <lib/libkern/libkern.h> 75 76 #include <netinet/ip6.h> 77 #include <netinet6/ip6_var.h> 78 79 #include <compat/sys/socket.h> 80 #include <compat/sys/sockio.h> 81 82 #include <compat/linux/common/linux_types.h> 83 #include <compat/linux/common/linux_util.h> 84 #include <compat/linux/common/linux_signal.h> 85 #include <compat/linux/common/linux_ioctl.h> 86 #include <compat/linux/common/linux_socket.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 int linux_to_bsd_sopt_level(int); 113 int linux_to_bsd_so_sockopt(int); 114 int linux_to_bsd_ip_sockopt(int); 115 int linux_to_bsd_tcp_sockopt(int); 116 int linux_to_bsd_udp_sockopt(int); 117 int linux_getifconf(struct lwp *, register_t *, void *); 118 int linux_getifhwaddr(struct lwp *, register_t *, u_int, void *); 119 static int linux_get_sa(struct lwp *, int, struct mbuf **, 120 const struct osockaddr *, unsigned int); 121 static int linux_sa_put(struct osockaddr *osa); 122 static int linux_to_bsd_msg_flags(int); 123 static int bsd_to_linux_msg_flags(int); 124 125 static const int linux_to_bsd_domain_[LINUX_AF_MAX] = { 126 AF_UNSPEC, 127 AF_UNIX, 128 AF_INET, 129 AF_CCITT, /* LINUX_AF_AX25 */ 130 AF_IPX, 131 AF_APPLETALK, 132 -1, /* LINUX_AF_NETROM */ 133 -1, /* LINUX_AF_BRIDGE */ 134 -1, /* LINUX_AF_ATMPVC */ 135 AF_CCITT, /* LINUX_AF_X25 */ 136 AF_INET6, 137 -1, /* LINUX_AF_ROSE */ 138 AF_DECnet, 139 -1, /* LINUX_AF_NETBEUI */ 140 -1, /* LINUX_AF_SECURITY */ 141 pseudo_AF_KEY, 142 AF_ROUTE, /* LINUX_AF_NETLINK */ 143 -1, /* LINUX_AF_PACKET */ 144 -1, /* LINUX_AF_ASH */ 145 -1, /* LINUX_AF_ECONET */ 146 -1, /* LINUX_AF_ATMSVC */ 147 AF_SNA, 148 /* rest up to LINUX_AF_MAX-1 is not allocated */ 149 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 150 }; 151 152 static const int bsd_to_linux_domain_[AF_MAX] = { 153 LINUX_AF_UNSPEC, 154 LINUX_AF_UNIX, 155 LINUX_AF_INET, 156 -1, /* AF_IMPLINK */ 157 -1, /* AF_PUP */ 158 -1, /* AF_CHAOS */ 159 -1, /* AF_NS */ 160 -1, /* AF_ISO */ 161 -1, /* AF_ECMA */ 162 -1, /* AF_DATAKIT */ 163 LINUX_AF_AX25, /* AF_CCITT */ 164 LINUX_AF_SNA, 165 LINUX_AF_DECnet, 166 -1, /* AF_DLI */ 167 -1, /* AF_LAT */ 168 -1, /* AF_HYLINK */ 169 LINUX_AF_APPLETALK, 170 LINUX_AF_NETLINK, 171 -1, /* AF_LINK */ 172 -1, /* AF_XTP */ 173 -1, /* AF_COIP */ 174 -1, /* AF_CNT */ 175 -1, /* pseudo_AF_RTIP */ 176 LINUX_AF_IPX, 177 LINUX_AF_INET6, 178 -1, /* pseudo_AF_PIP */ 179 -1, /* AF_ISDN */ 180 -1, /* AF_NATM */ 181 -1, /* AF_ARP */ 182 LINUX_pseudo_AF_KEY, 183 -1, /* pseudo_AF_HDRCMPLT */ 184 }; 185 186 static const struct { 187 int bfl; 188 int lfl; 189 } bsd_to_linux_msg_flags_[] = { 190 {MSG_OOB, LINUX_MSG_OOB}, 191 {MSG_PEEK, LINUX_MSG_PEEK}, 192 {MSG_DONTROUTE, LINUX_MSG_DONTROUTE}, 193 {MSG_EOR, LINUX_MSG_EOR}, 194 {MSG_TRUNC, LINUX_MSG_TRUNC}, 195 {MSG_CTRUNC, LINUX_MSG_CTRUNC}, 196 {MSG_WAITALL, LINUX_MSG_WAITALL}, 197 {MSG_DONTWAIT, LINUX_MSG_DONTWAIT}, 198 {MSG_BCAST, 0}, /* not supported, clear */ 199 {MSG_MCAST, 0}, /* not supported, clear */ 200 {-1, /* not supp */ LINUX_MSG_PROBE}, 201 {-1, /* not supp */ LINUX_MSG_FIN}, 202 {-1, /* not supp */ LINUX_MSG_SYN}, 203 {-1, /* not supp */ LINUX_MSG_CONFIRM}, 204 {-1, /* not supp */ LINUX_MSG_RST}, 205 {-1, /* not supp */ LINUX_MSG_ERRQUEUE}, 206 {-1, /* not supp */ LINUX_MSG_NOSIGNAL}, 207 {-1, /* not supp */ LINUX_MSG_MORE}, 208 }; 209 210 /* 211 * Convert between Linux and BSD socket domain values 212 */ 213 static int 214 linux_to_bsd_domain(int ldom) 215 { 216 if (ldom < 0 || ldom >= LINUX_AF_MAX) 217 return (-1); 218 219 return linux_to_bsd_domain_[ldom]; 220 } 221 222 /* 223 * Convert between BSD and Linux socket domain values 224 */ 225 static int 226 bsd_to_linux_domain(int bdom) 227 { 228 if (bdom < 0 || bdom >= AF_MAX) 229 return (-1); 230 231 return bsd_to_linux_domain_[bdom]; 232 } 233 234 static int 235 linux_to_bsd_msg_flags(int lflag) 236 { 237 int i, lfl, bfl; 238 int bflag = 0; 239 240 if (lflag == 0) 241 return (0); 242 243 for(i = 0; i < __arraycount(bsd_to_linux_msg_flags_); i++) { 244 bfl = bsd_to_linux_msg_flags_[i].bfl; 245 lfl = bsd_to_linux_msg_flags_[i].lfl; 246 247 if (lfl == 0) 248 continue; 249 250 if (lflag & lfl) { 251 if (bfl < 0) 252 return (-1); 253 254 bflag |= bfl; 255 } 256 } 257 258 return (bflag); 259 } 260 261 static int 262 bsd_to_linux_msg_flags(int bflag) 263 { 264 int i, lfl, bfl; 265 int lflag = 0; 266 267 if (bflag == 0) 268 return (0); 269 270 for(i = 0; i < __arraycount(bsd_to_linux_msg_flags_); i++) { 271 bfl = bsd_to_linux_msg_flags_[i].bfl; 272 lfl = bsd_to_linux_msg_flags_[i].lfl; 273 274 if (bfl <= 0) 275 continue; 276 277 if (bflag & bfl) { 278 if (lfl < 0) 279 return (-1); 280 281 lflag |= lfl; 282 } 283 } 284 285 return (lflag); 286 } 287 288 int 289 linux_sys_socket(struct lwp *l, const struct linux_sys_socket_args *uap, register_t *retval) 290 { 291 /* { 292 syscallarg(int) domain; 293 syscallarg(int) type; 294 syscallarg(int) protocol; 295 } */ 296 struct sys___socket30_args bsa; 297 int error; 298 299 SCARG(&bsa, protocol) = SCARG(uap, protocol); 300 SCARG(&bsa, type) = SCARG(uap, type); 301 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 302 if (SCARG(&bsa, domain) == -1) 303 return EINVAL; 304 error = sys___socket30(l, &bsa, retval); 305 306 #ifdef INET6 307 /* 308 * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by 309 * default and some apps depend on this. So, set V6ONLY to 0 310 * for Linux apps if the sysctl value is set to 1. 311 */ 312 if (!error && ip6_v6only && SCARG(&bsa, domain) == PF_INET6) { 313 struct socket *so; 314 315 if (fd_getsock(*retval, &so) == 0) { 316 int val = 0; 317 318 /* ignore error */ 319 (void)so_setsockopt(l, so, IPPROTO_IPV6, IPV6_V6ONLY, 320 &val, sizeof(val)); 321 322 fd_putfile(*retval); 323 } 324 } 325 #endif 326 327 return (error); 328 } 329 330 int 331 linux_sys_socketpair(struct lwp *l, const struct linux_sys_socketpair_args *uap, register_t *retval) 332 { 333 /* { 334 syscallarg(int) domain; 335 syscallarg(int) type; 336 syscallarg(int) protocol; 337 syscallarg(int *) rsv; 338 } */ 339 struct sys_socketpair_args bsa; 340 341 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 342 if (SCARG(&bsa, domain) == -1) 343 return EINVAL; 344 SCARG(&bsa, type) = SCARG(uap, type); 345 SCARG(&bsa, protocol) = SCARG(uap, protocol); 346 SCARG(&bsa, rsv) = SCARG(uap, rsv); 347 348 return sys_socketpair(l, &bsa, retval); 349 } 350 351 int 352 linux_sys_sendto(struct lwp *l, const struct linux_sys_sendto_args *uap, register_t *retval) 353 { 354 /* { 355 syscallarg(int) s; 356 syscallarg(void *) msg; 357 syscallarg(int) len; 358 syscallarg(int) flags; 359 syscallarg(struct osockaddr *) to; 360 syscallarg(int) tolen; 361 } */ 362 struct msghdr msg; 363 struct iovec aiov; 364 struct mbuf *nam; 365 int bflags; 366 int error; 367 368 /* Translate message flags. */ 369 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 370 if (bflags < 0) 371 /* Some supported flag */ 372 return EINVAL; 373 374 msg.msg_flags = 0; 375 msg.msg_name = NULL; 376 msg.msg_control = NULL; 377 378 if (SCARG(uap, tolen)) { 379 /* Read in and convert the sockaddr */ 380 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, to), 381 SCARG(uap, tolen)); 382 if (error) 383 return (error); 384 msg.msg_flags |= MSG_NAMEMBUF; 385 msg.msg_name = nam; 386 msg.msg_namelen = SCARG(uap, tolen); 387 } 388 389 msg.msg_iov = &aiov; 390 msg.msg_iovlen = 1; 391 aiov.iov_base = __UNCONST(SCARG(uap, msg)); 392 aiov.iov_len = SCARG(uap, len); 393 394 return do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval); 395 } 396 397 int 398 linux_sys_sendmsg(struct lwp *l, const struct linux_sys_sendmsg_args *uap, register_t *retval) 399 { 400 /* { 401 syscallarg(int) s; 402 syscallarg(struct msghdr *) msg; 403 syscallarg(u_int) flags; 404 } */ 405 struct msghdr msg; 406 int error; 407 int bflags; 408 struct mbuf *nam; 409 u_int8_t *control; 410 struct mbuf *ctl_mbuf = NULL; 411 412 error = copyin(SCARG(uap, msg), &msg, sizeof(msg)); 413 if (error) 414 return error; 415 416 msg.msg_flags = MSG_IOVUSRSPACE; 417 418 /* 419 * Translate message flags. 420 */ 421 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 422 if (bflags < 0) 423 /* Some supported flag */ 424 return EINVAL; 425 426 if (msg.msg_name) { 427 /* Read in and convert the sockaddr */ 428 error = linux_get_sa(l, SCARG(uap, s), &nam, msg.msg_name, 429 msg.msg_namelen); 430 if (error) 431 return (error); 432 msg.msg_flags |= MSG_NAMEMBUF; 433 msg.msg_name = nam; 434 } 435 436 /* 437 * Handle cmsg if there is any. 438 */ 439 if (CMSG_FIRSTHDR(&msg)) { 440 struct linux_cmsghdr l_cmsg, *l_cc; 441 struct cmsghdr *cmsg; 442 ssize_t resid = msg.msg_controllen; 443 size_t clen, cidx = 0, cspace; 444 445 ctl_mbuf = m_get(M_WAIT, MT_CONTROL); 446 clen = MLEN; 447 control = mtod(ctl_mbuf, void *); 448 449 l_cc = LINUX_CMSG_FIRSTHDR(&msg); 450 do { 451 error = copyin(l_cc, &l_cmsg, sizeof(l_cmsg)); 452 if (error) 453 goto done; 454 455 /* 456 * Sanity check the control message length. 457 */ 458 if (l_cmsg.cmsg_len > resid 459 || l_cmsg.cmsg_len < sizeof l_cmsg) { 460 error = EINVAL; 461 goto done; 462 } 463 464 /* 465 * Refuse unsupported control messages, and 466 * translate fields as appropriate. 467 */ 468 switch (l_cmsg.cmsg_level) { 469 case LINUX_SOL_SOCKET: 470 /* It only differs on some archs */ 471 if (LINUX_SOL_SOCKET != SOL_SOCKET) 472 l_cmsg.cmsg_level = SOL_SOCKET; 473 474 switch(l_cmsg.cmsg_type) { 475 case LINUX_SCM_RIGHTS: 476 /* Linux SCM_RIGHTS is same as NetBSD */ 477 break; 478 479 default: 480 /* other types not supported */ 481 error = EINVAL; 482 goto done; 483 } 484 break; 485 default: 486 /* pray and leave intact */ 487 break; 488 } 489 490 cspace = CMSG_SPACE(l_cmsg.cmsg_len - sizeof(l_cmsg)); 491 492 /* Check the buffer is big enough */ 493 if (__predict_false(cidx + cspace > clen)) { 494 u_int8_t *nc; 495 496 clen = cidx + cspace; 497 if (clen >= PAGE_SIZE) { 498 error = EINVAL; 499 goto done; 500 } 501 nc = realloc(clen <= MLEN ? NULL : control, 502 clen, M_TEMP, M_WAITOK); 503 if (!nc) { 504 error = ENOMEM; 505 goto done; 506 } 507 if (cidx <= MLEN) 508 /* Old buffer was in mbuf... */ 509 memcpy(nc, control, cidx); 510 control = nc; 511 } 512 513 /* Copy header */ 514 cmsg = (void *)&control[cidx]; 515 cmsg->cmsg_len = l_cmsg.cmsg_len + LINUX_CMSG_ALIGN_DELTA; 516 cmsg->cmsg_level = l_cmsg.cmsg_level; 517 cmsg->cmsg_type = l_cmsg.cmsg_type; 518 519 /* Zero are between header and data */ 520 memset(cmsg + 1, 0, 521 CMSG_ALIGN(sizeof(cmsg)) - sizeof(cmsg)); 522 523 /* Copyin the data */ 524 error = copyin(LINUX_CMSG_DATA(l_cc), 525 CMSG_DATA(control), 526 l_cmsg.cmsg_len - sizeof(l_cmsg)); 527 if (error) 528 goto done; 529 530 resid -= LINUX_CMSG_ALIGN(l_cmsg.cmsg_len); 531 cidx += cspace; 532 } while ((l_cc = LINUX_CMSG_NXTHDR(&msg, l_cc)) && resid > 0); 533 534 /* If we allocated a buffer, attach to mbuf */ 535 if (cidx > MLEN) { 536 MEXTADD(ctl_mbuf, control, clen, M_MBUF, NULL, NULL); 537 ctl_mbuf->m_flags |= M_EXT_RW; 538 } 539 control = NULL; 540 ctl_mbuf->m_len = cidx; 541 542 msg.msg_control = ctl_mbuf; 543 msg.msg_flags |= MSG_CONTROLMBUF; 544 } 545 546 error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval); 547 /* Freed internally */ 548 ctl_mbuf = NULL; 549 550 done: 551 if (ctl_mbuf != NULL) { 552 if (control != NULL && control != mtod(ctl_mbuf, void *)) 553 free(control, M_MBUF); 554 m_free(ctl_mbuf); 555 } 556 return (error); 557 } 558 559 int 560 linux_sys_recvfrom(struct lwp *l, const struct linux_sys_recvfrom_args *uap, register_t *retval) 561 { 562 /* { 563 syscallarg(int) s; 564 syscallarg(void *) buf; 565 syscallarg(int) len; 566 syscallarg(int) flags; 567 syscallarg(struct osockaddr *) from; 568 syscallarg(int *) fromlenaddr; 569 } */ 570 int error; 571 struct sys_recvfrom_args bra; 572 573 SCARG(&bra, s) = SCARG(uap, s); 574 SCARG(&bra, buf) = SCARG(uap, buf); 575 SCARG(&bra, len) = SCARG(uap, len); 576 SCARG(&bra, flags) = SCARG(uap, flags); 577 SCARG(&bra, from) = (struct sockaddr *) SCARG(uap, from); 578 SCARG(&bra, fromlenaddr) = (socklen_t *)SCARG(uap, fromlenaddr); 579 580 if ((error = sys_recvfrom(l, &bra, retval))) 581 return (error); 582 583 if (SCARG(uap, from) && (error = linux_sa_put(SCARG(uap, from)))) 584 return (error); 585 586 return (0); 587 } 588 589 static int 590 linux_copyout_msg_control(struct lwp *l, struct msghdr *mp, struct mbuf *control) 591 { 592 int dlen, error = 0; 593 struct cmsghdr *cmsg; 594 struct linux_cmsghdr linux_cmsg; 595 struct mbuf *m; 596 char *q, *q_end; 597 598 if (mp->msg_controllen <= 0 || control == 0) { 599 mp->msg_controllen = 0; 600 free_control_mbuf(l, control, control); 601 return 0; 602 } 603 604 q = (char *)mp->msg_control; 605 q_end = q + mp->msg_controllen; 606 607 for (m = control; m != NULL; ) { 608 cmsg = mtod(m, struct cmsghdr *); 609 610 /* 611 * Fixup cmsg. We handle two things: 612 * 0. different sizeof cmsg_len. 613 * 1. different values for level/type on some archs 614 * 2. different alignment of CMSG_DATA on some archs 615 */ 616 linux_cmsg.cmsg_len = cmsg->cmsg_len - LINUX_CMSG_ALIGN_DELTA; 617 linux_cmsg.cmsg_level = cmsg->cmsg_level; 618 linux_cmsg.cmsg_type = cmsg->cmsg_type; 619 620 dlen = q_end - q; 621 if (linux_cmsg.cmsg_len > dlen) { 622 /* Not enough room for the parameter */ 623 dlen -= sizeof linux_cmsg; 624 if (dlen <= 0) 625 /* Discard if header wont fit */ 626 break; 627 mp->msg_flags |= MSG_CTRUNC; 628 if (linux_cmsg.cmsg_level == SOL_SOCKET 629 && linux_cmsg.cmsg_type == SCM_RIGHTS) 630 /* Do not truncate me ... */ 631 break; 632 } else 633 dlen = linux_cmsg.cmsg_len - sizeof linux_cmsg; 634 635 switch (linux_cmsg.cmsg_level) { 636 case SOL_SOCKET: 637 linux_cmsg.cmsg_level = LINUX_SOL_SOCKET; 638 switch (linux_cmsg.cmsg_type) { 639 case SCM_RIGHTS: 640 /* Linux SCM_RIGHTS is same as NetBSD */ 641 break; 642 643 default: 644 /* other types not supported */ 645 error = EINVAL; 646 goto done; 647 } 648 /* machine dependant ! */ 649 break; 650 default: 651 /* pray and leave intact */ 652 break; 653 } 654 655 /* There can be padding between the header and data... */ 656 error = copyout(&linux_cmsg, q, sizeof *cmsg); 657 if (error != 0) { 658 error = copyout(CCMSG_DATA(cmsg), q + sizeof linux_cmsg, 659 dlen); 660 } 661 if (error != 0) { 662 /* We must free all the SCM_RIGHTS */ 663 m = control; 664 break; 665 } 666 m = m->m_next; 667 if (m == NULL || q + LINUX_CMSG_ALIGN(dlen) > q_end) { 668 q += dlen; 669 break; 670 } 671 q += LINUX_CMSG_ALIGN(dlen); 672 } 673 674 done: 675 free_control_mbuf(l, control, m); 676 677 mp->msg_controllen = q - (char *)mp->msg_control; 678 return error; 679 } 680 681 int 682 linux_sys_recvmsg(struct lwp *l, const struct linux_sys_recvmsg_args *uap, register_t *retval) 683 { 684 /* { 685 syscallarg(int) s; 686 syscallarg(struct msghdr *) msg; 687 syscallarg(u_int) flags; 688 } */ 689 struct msghdr msg; 690 int error; 691 struct mbuf *from, *control; 692 693 error = copyin(SCARG(uap, msg), &msg, sizeof(msg)); 694 if (error) 695 return (error); 696 697 msg.msg_flags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 698 if (msg.msg_flags < 0) { 699 /* Some unsupported flag */ 700 return (EINVAL); 701 } 702 msg.msg_flags |= MSG_IOVUSRSPACE; 703 704 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, 705 msg.msg_control != NULL ? &control : NULL, retval); 706 if (error != 0) 707 return error; 708 709 if (msg.msg_control != NULL) 710 error = linux_copyout_msg_control(l, &msg, control); 711 712 if (error == 0 && from != 0) { 713 mtod(from, struct osockaddr *)->sa_family = 714 bsd_to_linux_domain(mtod(from, struct sockaddr *)->sa_family); 715 error = copyout_sockname(msg.msg_name, &msg.msg_namelen, 0, 716 from); 717 } else 718 msg.msg_namelen = 0; 719 720 if (from != NULL) 721 m_free(from); 722 723 if (error == 0) { 724 msg.msg_flags = bsd_to_linux_msg_flags(msg.msg_flags); 725 if (msg.msg_flags < 0) 726 /* Some flag unsupported by Linux */ 727 error = EINVAL; 728 else 729 error = copyout(&msg, SCARG(uap, msg), sizeof(msg)); 730 } 731 732 return (error); 733 } 734 735 /* 736 * Convert socket option level from Linux to NetBSD value. Only SOL_SOCKET 737 * is different, the rest matches IPPROTO_* on both systems. 738 */ 739 int 740 linux_to_bsd_sopt_level(int llevel) 741 { 742 743 switch (llevel) { 744 case LINUX_SOL_SOCKET: 745 return SOL_SOCKET; 746 case LINUX_SOL_IP: 747 return IPPROTO_IP; 748 case LINUX_SOL_TCP: 749 return IPPROTO_TCP; 750 case LINUX_SOL_UDP: 751 return IPPROTO_UDP; 752 default: 753 return -1; 754 } 755 } 756 757 /* 758 * Convert Linux socket level socket option numbers to NetBSD values. 759 */ 760 int 761 linux_to_bsd_so_sockopt(int lopt) 762 { 763 764 switch (lopt) { 765 case LINUX_SO_DEBUG: 766 return SO_DEBUG; 767 case LINUX_SO_REUSEADDR: 768 /* 769 * Linux does not implement SO_REUSEPORT, but allows reuse of a 770 * host:port pair through SO_REUSEADDR even if the address is not a 771 * multicast-address. Effectively, this means that we should use 772 * SO_REUSEPORT to allow Linux applications to not exit with 773 * EADDRINUSE 774 */ 775 return SO_REUSEPORT; 776 case LINUX_SO_TYPE: 777 return SO_TYPE; 778 case LINUX_SO_ERROR: 779 return SO_ERROR; 780 case LINUX_SO_DONTROUTE: 781 return SO_DONTROUTE; 782 case LINUX_SO_BROADCAST: 783 return SO_BROADCAST; 784 case LINUX_SO_SNDBUF: 785 return SO_SNDBUF; 786 case LINUX_SO_RCVBUF: 787 return SO_RCVBUF; 788 case LINUX_SO_KEEPALIVE: 789 return SO_KEEPALIVE; 790 case LINUX_SO_OOBINLINE: 791 return SO_OOBINLINE; 792 case LINUX_SO_LINGER: 793 return SO_LINGER; 794 case LINUX_SO_PRIORITY: 795 case LINUX_SO_NO_CHECK: 796 default: 797 return -1; 798 } 799 } 800 801 /* 802 * Convert Linux IP level socket option number to NetBSD values. 803 */ 804 int 805 linux_to_bsd_ip_sockopt(int lopt) 806 { 807 808 switch (lopt) { 809 case LINUX_IP_TOS: 810 return IP_TOS; 811 case LINUX_IP_TTL: 812 return IP_TTL; 813 case LINUX_IP_MULTICAST_TTL: 814 return IP_MULTICAST_TTL; 815 case LINUX_IP_MULTICAST_LOOP: 816 return IP_MULTICAST_LOOP; 817 case LINUX_IP_MULTICAST_IF: 818 return IP_MULTICAST_IF; 819 case LINUX_IP_ADD_MEMBERSHIP: 820 return IP_ADD_MEMBERSHIP; 821 case LINUX_IP_DROP_MEMBERSHIP: 822 return IP_DROP_MEMBERSHIP; 823 default: 824 return -1; 825 } 826 } 827 828 /* 829 * Convert Linux TCP level socket option number to NetBSD values. 830 */ 831 int 832 linux_to_bsd_tcp_sockopt(int lopt) 833 { 834 835 switch (lopt) { 836 case LINUX_TCP_NODELAY: 837 return TCP_NODELAY; 838 case LINUX_TCP_MAXSEG: 839 return TCP_MAXSEG; 840 default: 841 return -1; 842 } 843 } 844 845 /* 846 * Convert Linux UDP level socket option number to NetBSD values. 847 */ 848 int 849 linux_to_bsd_udp_sockopt(int lopt) 850 { 851 852 switch (lopt) { 853 default: 854 return -1; 855 } 856 } 857 858 /* 859 * Another reasonably straightforward function: setsockopt(2). 860 * The level and option numbers are converted; the values passed 861 * are not (yet) converted, the ones currently implemented don't 862 * need conversion, as they are the same on both systems. 863 */ 864 int 865 linux_sys_setsockopt(struct lwp *l, const struct linux_sys_setsockopt_args *uap, register_t *retval) 866 { 867 /* { 868 syscallarg(int) s; 869 syscallarg(int) level; 870 syscallarg(int) optname; 871 syscallarg(void *) optval; 872 syscallarg(int) optlen; 873 } */ 874 struct sys_setsockopt_args bsa; 875 int name; 876 877 SCARG(&bsa, s) = SCARG(uap, s); 878 SCARG(&bsa, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 879 SCARG(&bsa, val) = SCARG(uap, optval); 880 SCARG(&bsa, valsize) = SCARG(uap, optlen); 881 882 /* 883 * Linux supports only SOL_SOCKET for AF_LOCAL domain sockets 884 * and returns EOPNOTSUPP for other levels 885 */ 886 if (SCARG(&bsa, level) != SOL_SOCKET) { 887 struct socket *so; 888 int error, family; 889 890 /* fd_getsock() will use the descriptor for us */ 891 if ((error = fd_getsock(SCARG(&bsa, s), &so)) != 0) 892 return error; 893 family = so->so_proto->pr_domain->dom_family; 894 fd_putfile(SCARG(&bsa, s)); 895 896 if (family == AF_LOCAL) 897 return EOPNOTSUPP; 898 } 899 900 switch (SCARG(&bsa, level)) { 901 case SOL_SOCKET: 902 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 903 break; 904 case IPPROTO_IP: 905 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 906 break; 907 case IPPROTO_TCP: 908 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 909 break; 910 case IPPROTO_UDP: 911 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 912 break; 913 default: 914 return EINVAL; 915 } 916 917 if (name == -1) 918 return EINVAL; 919 SCARG(&bsa, name) = name; 920 921 return sys_setsockopt(l, &bsa, retval); 922 } 923 924 /* 925 * getsockopt(2) is very much the same as setsockopt(2) (see above) 926 */ 927 int 928 linux_sys_getsockopt(struct lwp *l, const struct linux_sys_getsockopt_args *uap, register_t *retval) 929 { 930 /* { 931 syscallarg(int) s; 932 syscallarg(int) level; 933 syscallarg(int) optname; 934 syscallarg(void *) optval; 935 syscallarg(int *) optlen; 936 } */ 937 struct sys_getsockopt_args bga; 938 int name; 939 940 SCARG(&bga, s) = SCARG(uap, s); 941 SCARG(&bga, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 942 SCARG(&bga, val) = SCARG(uap, optval); 943 SCARG(&bga, avalsize) = (socklen_t *)SCARG(uap, optlen); 944 945 switch (SCARG(&bga, level)) { 946 case SOL_SOCKET: 947 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 948 break; 949 case IPPROTO_IP: 950 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 951 break; 952 case IPPROTO_TCP: 953 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 954 break; 955 case IPPROTO_UDP: 956 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 957 break; 958 default: 959 return EINVAL; 960 } 961 962 if (name == -1) 963 return EINVAL; 964 SCARG(&bga, name) = name; 965 966 return sys_getsockopt(l, &bga, retval); 967 } 968 969 int 970 linux_getifconf(struct lwp *l, register_t *retval, void *data) 971 { 972 struct linux_ifreq ifr, *ifrp; 973 struct ifconf *ifc = data; 974 struct ifnet *ifp; 975 struct ifaddr *ifa; 976 struct sockaddr *sa; 977 struct osockaddr *osa; 978 int space, error = 0; 979 const int sz = (int)sizeof(ifr); 980 981 ifrp = (struct linux_ifreq *)ifc->ifc_req; 982 if (ifrp == NULL) 983 space = 0; 984 else 985 space = ifc->ifc_len; 986 987 IFNET_FOREACH(ifp) { 988 (void)strncpy(ifr.ifr_name, ifp->if_xname, 989 sizeof(ifr.ifr_name)); 990 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 991 return ENAMETOOLONG; 992 if (IFADDR_EMPTY(ifp)) 993 continue; 994 IFADDR_FOREACH(ifa, ifp) { 995 sa = ifa->ifa_addr; 996 if (sa->sa_family != AF_INET || 997 sa->sa_len > sizeof(*osa)) 998 continue; 999 memcpy(&ifr.ifr_addr, sa, sa->sa_len); 1000 osa = (struct osockaddr *)&ifr.ifr_addr; 1001 osa->sa_family = sa->sa_family; 1002 if (space >= sz) { 1003 error = copyout(&ifr, ifrp, sz); 1004 if (error != 0) 1005 return error; 1006 ifrp++; 1007 } 1008 space -= sz; 1009 } 1010 } 1011 1012 if (ifrp != NULL) 1013 ifc->ifc_len -= space; 1014 else 1015 ifc->ifc_len = -space; 1016 1017 return 0; 1018 } 1019 1020 int 1021 linux_getifhwaddr(struct lwp *l, register_t *retval, u_int fd, 1022 void *data) 1023 { 1024 /* Not the full structure, just enough to map what we do here */ 1025 struct linux_ifreq lreq; 1026 file_t *fp; 1027 struct ifaddr *ifa; 1028 struct ifnet *ifp; 1029 struct sockaddr_dl *sadl; 1030 int error, found; 1031 int index, ifnum; 1032 1033 /* 1034 * We can't emulate this ioctl by calling sys_ioctl() to run 1035 * SIOCGIFCONF, because the user buffer is not of the right 1036 * type to take those results. We can't use kernel buffers to 1037 * receive the results, as the implementation of sys_ioctl() 1038 * and ifconf() [which implements SIOCGIFCONF] use 1039 * copyin()/copyout() which will fail on kernel addresses. 1040 * 1041 * So, we must duplicate code from sys_ioctl() and ifconf(). Ugh. 1042 */ 1043 1044 if ((fp = fd_getfile(fd)) == NULL) 1045 return (EBADF); 1046 1047 KERNEL_LOCK(1, NULL); 1048 1049 if ((fp->f_flag & (FREAD | FWRITE)) == 0) { 1050 error = EBADF; 1051 goto out; 1052 } 1053 1054 error = copyin(data, &lreq, sizeof(lreq)); 1055 if (error) 1056 goto out; 1057 lreq.ifr_name[LINUX_IFNAMSIZ-1] = '\0'; /* just in case */ 1058 1059 /* 1060 * Try real interface name first, then fake "ethX" 1061 */ 1062 found = 0; 1063 IFNET_FOREACH(ifp) { 1064 if (found) 1065 break; 1066 if (strcmp(lreq.ifr_name, ifp->if_xname)) 1067 /* not this interface */ 1068 continue; 1069 found=1; 1070 if (IFADDR_EMPTY(ifp)) { 1071 error = ENODEV; 1072 goto out; 1073 } 1074 IFADDR_FOREACH(ifa, ifp) { 1075 sadl = satosdl(ifa->ifa_addr); 1076 /* only return ethernet addresses */ 1077 /* XXX what about FDDI, etc. ? */ 1078 if (sadl->sdl_family != AF_LINK || 1079 sadl->sdl_type != IFT_ETHER) 1080 continue; 1081 memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl), 1082 MIN(sadl->sdl_alen, 1083 sizeof(lreq.ifr_hwaddr.sa_data))); 1084 lreq.ifr_hwaddr.sa_family = 1085 sadl->sdl_family; 1086 error = copyout(&lreq, data, sizeof(lreq)); 1087 goto out; 1088 } 1089 } 1090 1091 if (strncmp(lreq.ifr_name, "eth", 3) == 0) { 1092 for (ifnum = 0, index = 3; 1093 lreq.ifr_name[index] != '\0' && index < LINUX_IFNAMSIZ; 1094 index++) { 1095 ifnum *= 10; 1096 ifnum += lreq.ifr_name[index] - '0'; 1097 } 1098 1099 error = EINVAL; /* in case we don't find one */ 1100 found = 0; 1101 IFNET_FOREACH(ifp) { 1102 if (found) 1103 break; 1104 memcpy(lreq.ifr_name, ifp->if_xname, 1105 MIN(LINUX_IFNAMSIZ, IFNAMSIZ)); 1106 IFADDR_FOREACH(ifa, ifp) { 1107 sadl = satosdl(ifa->ifa_addr); 1108 /* only return ethernet addresses */ 1109 /* XXX what about FDDI, etc. ? */ 1110 if (sadl->sdl_family != AF_LINK || 1111 sadl->sdl_type != IFT_ETHER) 1112 continue; 1113 if (ifnum--) 1114 /* not the reqested iface */ 1115 continue; 1116 memcpy(&lreq.ifr_hwaddr.sa_data, 1117 CLLADDR(sadl), 1118 MIN(sadl->sdl_alen, 1119 sizeof(lreq.ifr_hwaddr.sa_data))); 1120 lreq.ifr_hwaddr.sa_family = 1121 sadl->sdl_family; 1122 error = copyout(&lreq, data, sizeof(lreq)); 1123 found = 1; 1124 break; 1125 } 1126 } 1127 } else { 1128 /* unknown interface, not even an "eth*" name */ 1129 error = ENODEV; 1130 } 1131 1132 out: 1133 KERNEL_UNLOCK_ONE(NULL); 1134 fd_putfile(fd); 1135 return error; 1136 } 1137 1138 int 1139 linux_ioctl_socket(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 1140 { 1141 /* { 1142 syscallarg(int) fd; 1143 syscallarg(u_long) com; 1144 syscallarg(void *) data; 1145 } */ 1146 u_long com; 1147 int error = 0, isdev = 0, dosys = 1; 1148 struct sys_ioctl_args ia; 1149 file_t *fp; 1150 struct vnode *vp; 1151 int (*ioctlf)(file_t *, u_long, void *); 1152 struct ioctl_pt pt; 1153 1154 if ((fp = fd_getfile(SCARG(uap, fd))) == NULL) 1155 return (EBADF); 1156 1157 if (fp->f_type == DTYPE_VNODE) { 1158 vp = (struct vnode *)fp->f_data; 1159 isdev = vp->v_type == VCHR; 1160 } 1161 1162 /* 1163 * Don't try to interpret socket ioctl calls that are done 1164 * on a device filedescriptor, just pass them through, to 1165 * emulate Linux behaviour. Use PTIOCLINUX so that the 1166 * device will only handle these if it's prepared to do 1167 * so, to avoid unexpected things from happening. 1168 */ 1169 if (isdev) { 1170 dosys = 0; 1171 ioctlf = fp->f_ops->fo_ioctl; 1172 pt.com = SCARG(uap, com); 1173 pt.data = SCARG(uap, data); 1174 error = ioctlf(fp, PTIOCLINUX, &pt); 1175 /* 1176 * XXX hack: if the function returns EJUSTRETURN, 1177 * it has stuffed a sysctl return value in pt.data. 1178 */ 1179 if (error == EJUSTRETURN) { 1180 retval[0] = (register_t)pt.data; 1181 error = 0; 1182 } 1183 goto out; 1184 } 1185 1186 com = SCARG(uap, com); 1187 retval[0] = 0; 1188 1189 switch (com) { 1190 case LINUX_SIOCGIFCONF: 1191 error = linux_getifconf(l, retval, SCARG(uap, data)); 1192 dosys = 0; 1193 break; 1194 case LINUX_SIOCGIFFLAGS: 1195 SCARG(&ia, com) = OSIOCGIFFLAGS; 1196 break; 1197 case LINUX_SIOCSIFFLAGS: 1198 SCARG(&ia, com) = OSIOCSIFFLAGS; 1199 break; 1200 case LINUX_SIOCGIFADDR: 1201 SCARG(&ia, com) = OOSIOCGIFADDR; 1202 break; 1203 case LINUX_SIOCGIFDSTADDR: 1204 SCARG(&ia, com) = OOSIOCGIFDSTADDR; 1205 break; 1206 case LINUX_SIOCGIFBRDADDR: 1207 SCARG(&ia, com) = OOSIOCGIFBRDADDR; 1208 break; 1209 case LINUX_SIOCGIFNETMASK: 1210 SCARG(&ia, com) = OOSIOCGIFNETMASK; 1211 break; 1212 case LINUX_SIOCADDMULTI: 1213 SCARG(&ia, com) = OSIOCADDMULTI; 1214 break; 1215 case LINUX_SIOCDELMULTI: 1216 SCARG(&ia, com) = OSIOCDELMULTI; 1217 break; 1218 case LINUX_SIOCGIFHWADDR: 1219 error = linux_getifhwaddr(l, retval, SCARG(uap, fd), 1220 SCARG(uap, data)); 1221 dosys = 0; 1222 break; 1223 default: 1224 error = EINVAL; 1225 } 1226 1227 out: 1228 fd_putfile(SCARG(uap, fd)); 1229 1230 if (error ==0 && dosys) { 1231 SCARG(&ia, fd) = SCARG(uap, fd); 1232 SCARG(&ia, data) = SCARG(uap, data); 1233 error = sys_ioctl(curlwp, &ia, retval); 1234 } 1235 1236 return error; 1237 } 1238 1239 int 1240 linux_sys_connect(struct lwp *l, const struct linux_sys_connect_args *uap, register_t *retval) 1241 { 1242 /* { 1243 syscallarg(int) s; 1244 syscallarg(const struct sockaddr *) name; 1245 syscallarg(int) namelen; 1246 } */ 1247 int error; 1248 struct mbuf *nam; 1249 1250 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, name), 1251 SCARG(uap, namelen)); 1252 if (error) 1253 return (error); 1254 1255 error = do_sys_connect(l, SCARG(uap, s), nam); 1256 1257 if (error == EISCONN) { 1258 struct socket *so; 1259 int state, prflags, nbio; 1260 1261 /* fd_getsock() will use the descriptor for us */ 1262 if (fd_getsock(SCARG(uap, s), &so) != 0) 1263 return EISCONN; 1264 1265 solock(so); 1266 state = so->so_state; 1267 nbio = so->so_nbio; 1268 prflags = so->so_proto->pr_flags; 1269 sounlock(so); 1270 fd_putfile(SCARG(uap, s)); 1271 /* 1272 * We should only let this call succeed once per 1273 * non-blocking connect; however we don't have 1274 * a convenient place to keep that state.. 1275 */ 1276 if (nbio && (state & SS_ISCONNECTED) && 1277 (prflags & PR_CONNREQUIRED)) 1278 return 0; 1279 } 1280 1281 return (error); 1282 } 1283 1284 int 1285 linux_sys_bind(struct lwp *l, const struct linux_sys_bind_args *uap, register_t *retval) 1286 { 1287 /* { 1288 syscallarg(int) s; 1289 syscallarg(const struct osockaddr *) name; 1290 syscallarg(int) namelen; 1291 } */ 1292 int error; 1293 struct mbuf *nam; 1294 1295 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, name), 1296 SCARG(uap, namelen)); 1297 if (error) 1298 return (error); 1299 1300 return do_sys_bind(l, SCARG(uap, s), nam); 1301 } 1302 1303 int 1304 linux_sys_getsockname(struct lwp *l, const struct linux_sys_getsockname_args *uap, register_t *retval) 1305 { 1306 /* { 1307 syscallarg(int) fdes; 1308 syscallarg(void *) asa; 1309 syscallarg(int *) alen; 1310 } */ 1311 int error; 1312 1313 if ((error = sys_getsockname(l, (const void *)uap, retval)) != 0) 1314 return (error); 1315 1316 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1317 return (error); 1318 1319 return (0); 1320 } 1321 1322 int 1323 linux_sys_getpeername(struct lwp *l, const struct linux_sys_getpeername_args *uap, register_t *retval) 1324 { 1325 /* { 1326 syscallarg(int) fdes; 1327 syscallarg(void *) asa; 1328 syscallarg(int *) alen; 1329 } */ 1330 int error; 1331 1332 if ((error = sys_getpeername(l, (const void *)uap, retval)) != 0) 1333 return (error); 1334 1335 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1336 return (error); 1337 1338 return (0); 1339 } 1340 1341 /* 1342 * Copy the osockaddr structure pointed to by osa to mbuf, adjust 1343 * family and convert to sockaddr. 1344 */ 1345 static int 1346 linux_get_sa(struct lwp *l, int s, struct mbuf **mp, 1347 const struct osockaddr *osa, unsigned int salen) 1348 { 1349 int error, bdom; 1350 struct sockaddr *sa; 1351 struct osockaddr *kosa; 1352 struct mbuf *m; 1353 1354 if (salen == 1 || salen > UCHAR_MAX) { 1355 DPRINTF(("bad osa=%p salen=%d\n", osa, salen)); 1356 return EINVAL; 1357 } 1358 1359 /* We'll need the address in an mbuf later, so copy into one here */ 1360 m = m_get(M_WAIT, MT_SONAME); 1361 if (salen > MLEN) 1362 MEXTMALLOC(m, salen, M_WAITOK); 1363 1364 m->m_len = salen; 1365 1366 if (salen == 0) { 1367 *mp = m; 1368 return 0; 1369 } 1370 1371 kosa = mtod(m, void *); 1372 if ((error = copyin(osa, kosa, salen))) { 1373 DPRINTF(("error %d copying osa %p len %d\n", 1374 error, osa, salen)); 1375 goto bad; 1376 } 1377 1378 ktrkuser("linux sockaddr", kosa, salen); 1379 1380 bdom = linux_to_bsd_domain(kosa->sa_family); 1381 if (bdom == -1) { 1382 DPRINTF(("bad linux family=%d\n", kosa->sa_family)); 1383 error = EINVAL; 1384 goto bad; 1385 } 1386 1387 /* 1388 * If the family is unspecified, use address family of the socket. 1389 * This avoid triggering strict family checks in netinet/in_pcb.c et.al. 1390 */ 1391 if (bdom == AF_UNSPEC) { 1392 struct socket *so; 1393 1394 /* fd_getsock() will use the descriptor for us */ 1395 if ((error = fd_getsock(s, &so)) != 0) 1396 goto bad; 1397 1398 bdom = so->so_proto->pr_domain->dom_family; 1399 fd_putfile(s); 1400 1401 DPRINTF(("AF_UNSPEC family adjusted to %d\n", bdom)); 1402 } 1403 1404 /* 1405 * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6, 1406 * which lacks the scope id compared with RFC2553 one. If we detect 1407 * the situation, reject the address and write a message to system log. 1408 * 1409 * Still accept addresses for which the scope id is not used. 1410 */ 1411 if (bdom == AF_INET6 && salen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) { 1412 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)kosa; 1413 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) && 1414 (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1415 IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) || 1416 IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) || 1417 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 1418 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) { 1419 struct proc *p = l->l_proc; 1420 int uid = l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1; 1421 1422 log(LOG_DEBUG, 1423 "pid %d (%s), uid %d: obsolete pre-RFC2553 " 1424 "sockaddr_in6 rejected", 1425 p->p_pid, p->p_comm, uid); 1426 error = EINVAL; 1427 goto bad; 1428 } 1429 salen = sizeof (struct sockaddr_in6); 1430 sin6->sin6_scope_id = 0; 1431 } 1432 1433 if (bdom == AF_INET) 1434 salen = sizeof(struct sockaddr_in); 1435 1436 sa = (struct sockaddr *) kosa; 1437 sa->sa_family = bdom; 1438 sa->sa_len = salen; 1439 m->m_len = salen; 1440 ktrkuser("new sockaddr", kosa, salen); 1441 1442 #ifdef DEBUG_LINUX 1443 DPRINTF(("family %d, len = %d [ ", sa->sa_family, sa->sa_len)); 1444 for (bdom = 0; bdom < sizeof(sa->sa_data); bdom++) 1445 DPRINTF(("%02x ", (unsigned char) sa->sa_data[bdom])); 1446 DPRINTF(("\n")); 1447 #endif 1448 1449 *mp = m; 1450 return 0; 1451 1452 bad: 1453 m_free(m); 1454 return error; 1455 } 1456 1457 static int 1458 linux_sa_put(struct osockaddr *osa) 1459 { 1460 struct sockaddr sa; 1461 struct osockaddr *kosa; 1462 int error, bdom, len; 1463 1464 /* 1465 * Only read/write the sockaddr family and length part, the rest is 1466 * not changed. 1467 */ 1468 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 1469 1470 error = copyin(osa, &sa, len); 1471 if (error) 1472 return (error); 1473 1474 bdom = bsd_to_linux_domain(sa.sa_family); 1475 if (bdom == -1) 1476 return (EINVAL); 1477 1478 /* Note: we convert from sockaddr to osockaddr here, too */ 1479 kosa = (struct osockaddr *) &sa; 1480 kosa->sa_family = bdom; 1481 error = copyout(kosa, osa, len); 1482 if (error) 1483 return (error); 1484 1485 return (0); 1486 } 1487 1488 #ifndef __amd64__ 1489 int 1490 linux_sys_recv(struct lwp *l, const struct linux_sys_recv_args *uap, register_t *retval) 1491 { 1492 /* { 1493 syscallarg(int) s; 1494 syscallarg(void *) buf; 1495 syscallarg(int) len; 1496 syscallarg(int) flags; 1497 } */ 1498 struct sys_recvfrom_args bra; 1499 1500 1501 SCARG(&bra, s) = SCARG(uap, s); 1502 SCARG(&bra, buf) = SCARG(uap, buf); 1503 SCARG(&bra, len) = (size_t) SCARG(uap, len); 1504 SCARG(&bra, flags) = SCARG(uap, flags); 1505 SCARG(&bra, from) = NULL; 1506 SCARG(&bra, fromlenaddr) = NULL; 1507 1508 return (sys_recvfrom(l, &bra, retval)); 1509 } 1510 1511 int 1512 linux_sys_send(struct lwp *l, const struct linux_sys_send_args *uap, register_t *retval) 1513 { 1514 /* { 1515 syscallarg(int) s; 1516 syscallarg(void *) buf; 1517 syscallarg(int) len; 1518 syscallarg(int) flags; 1519 } */ 1520 struct sys_sendto_args bsa; 1521 1522 SCARG(&bsa, s) = SCARG(uap, s); 1523 SCARG(&bsa, buf) = SCARG(uap, buf); 1524 SCARG(&bsa, len) = SCARG(uap, len); 1525 SCARG(&bsa, flags) = SCARG(uap, flags); 1526 SCARG(&bsa, to) = NULL; 1527 SCARG(&bsa, tolen) = 0; 1528 1529 return (sys_sendto(l, &bsa, retval)); 1530 } 1531 #endif 1532 1533 int 1534 linux_sys_accept(struct lwp *l, const struct linux_sys_accept_args *uap, register_t *retval) 1535 { 1536 /* { 1537 syscallarg(int) s; 1538 syscallarg(struct osockaddr *) name; 1539 syscallarg(int *) anamelen; 1540 } */ 1541 int error; 1542 struct sys_accept_args baa; 1543 1544 SCARG(&baa, s) = SCARG(uap, s); 1545 SCARG(&baa, name) = (struct sockaddr *) SCARG(uap, name); 1546 SCARG(&baa, anamelen) = (unsigned int *) SCARG(uap, anamelen); 1547 1548 if ((error = sys_accept(l, &baa, retval))) 1549 return (error); 1550 1551 if (SCARG(uap, name) && (error = linux_sa_put(SCARG(uap, name)))) 1552 return (error); 1553 1554 return (0); 1555 } 1556