1 /* $NetBSD: linux_socket.c,v 1.99 2008/11/19 18:36:03 ad 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 1.99 2008/11/19 18:36:03 ad 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 msg.msg_flags = MSG_IOVUSRSPACE; 413 414 /* 415 * Translate message flags. 416 */ 417 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 418 if (bflags < 0) 419 /* Some supported flag */ 420 return EINVAL; 421 422 if (msg.msg_name) { 423 /* Read in and convert the sockaddr */ 424 error = linux_get_sa(l, SCARG(uap, s), &nam, msg.msg_name, 425 msg.msg_namelen); 426 if (error) 427 return (error); 428 msg.msg_flags |= MSG_NAMEMBUF; 429 msg.msg_name = nam; 430 } 431 432 /* 433 * Handle cmsg if there is any. 434 */ 435 if (CMSG_FIRSTHDR(&msg)) { 436 struct linux_cmsghdr l_cmsg, *l_cc; 437 struct cmsghdr *cmsg; 438 ssize_t resid = msg.msg_controllen; 439 size_t clen, cidx = 0, cspace; 440 441 ctl_mbuf = m_get(M_WAIT, MT_CONTROL); 442 clen = MLEN; 443 control = mtod(ctl_mbuf, void *); 444 445 l_cc = LINUX_CMSG_FIRSTHDR(&msg); 446 do { 447 error = copyin(l_cc, &l_cmsg, sizeof(l_cmsg)); 448 if (error) 449 goto done; 450 451 /* 452 * Sanity check the control message length. 453 */ 454 if (l_cmsg.cmsg_len > resid 455 || l_cmsg.cmsg_len < sizeof l_cmsg) { 456 error = EINVAL; 457 goto done; 458 } 459 460 /* 461 * Refuse unsupported control messages, and 462 * translate fields as appropriate. 463 */ 464 switch (l_cmsg.cmsg_level) { 465 case LINUX_SOL_SOCKET: 466 /* It only differs on some archs */ 467 if (LINUX_SOL_SOCKET != SOL_SOCKET) 468 l_cmsg.cmsg_level = SOL_SOCKET; 469 470 switch(l_cmsg.cmsg_type) { 471 case LINUX_SCM_RIGHTS: 472 /* Linux SCM_RIGHTS is same as NetBSD */ 473 break; 474 475 default: 476 /* other types not supported */ 477 error = EINVAL; 478 goto done; 479 } 480 break; 481 default: 482 /* pray and leave intact */ 483 break; 484 } 485 486 cspace = CMSG_SPACE(l_cmsg.cmsg_len - sizeof(l_cmsg)); 487 488 /* Check the buffer is big enough */ 489 if (__predict_false(cidx + cspace > clen)) { 490 u_int8_t *nc; 491 492 clen = cidx + cspace; 493 if (clen >= PAGE_SIZE) { 494 error = EINVAL; 495 goto done; 496 } 497 nc = realloc(clen <= MLEN ? NULL : control, 498 clen, M_TEMP, M_WAITOK); 499 if (!nc) { 500 error = ENOMEM; 501 goto done; 502 } 503 if (cidx <= MLEN) 504 /* Old buffer was in mbuf... */ 505 memcpy(nc, control, cidx); 506 control = nc; 507 } 508 509 /* Copy header */ 510 cmsg = (void *)&control[cidx]; 511 cmsg->cmsg_len = l_cmsg.cmsg_len + LINUX_CMSG_ALIGN_DELTA; 512 cmsg->cmsg_level = l_cmsg.cmsg_level; 513 cmsg->cmsg_type = l_cmsg.cmsg_type; 514 515 /* Zero are between header and data */ 516 memset(cmsg + 1, 0, 517 CMSG_ALIGN(sizeof(cmsg)) - sizeof(cmsg)); 518 519 /* Copyin the data */ 520 error = copyin(LINUX_CMSG_DATA(l_cc), 521 CMSG_DATA(control), 522 l_cmsg.cmsg_len - sizeof(l_cmsg)); 523 if (error) 524 goto done; 525 526 resid -= LINUX_CMSG_ALIGN(l_cmsg.cmsg_len); 527 cidx += cspace; 528 } while ((l_cc = LINUX_CMSG_NXTHDR(&msg, l_cc)) && resid > 0); 529 530 /* If we allocated a buffer, attach to mbuf */ 531 if (cidx > MLEN) { 532 MEXTADD(ctl_mbuf, control, clen, M_MBUF, NULL, NULL); 533 ctl_mbuf->m_flags |= M_EXT_RW; 534 } 535 control = NULL; 536 ctl_mbuf->m_len = cidx; 537 538 msg.msg_control = ctl_mbuf; 539 msg.msg_flags |= MSG_CONTROLMBUF; 540 } 541 542 error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval); 543 /* Freed internally */ 544 ctl_mbuf = NULL; 545 546 done: 547 if (ctl_mbuf != NULL) { 548 if (control != NULL && control != mtod(ctl_mbuf, void *)) 549 free(control, M_MBUF); 550 m_free(ctl_mbuf); 551 } 552 return (error); 553 } 554 555 int 556 linux_sys_recvfrom(struct lwp *l, const struct linux_sys_recvfrom_args *uap, register_t *retval) 557 { 558 /* { 559 syscallarg(int) s; 560 syscallarg(void *) buf; 561 syscallarg(int) len; 562 syscallarg(int) flags; 563 syscallarg(struct osockaddr *) from; 564 syscallarg(int *) fromlenaddr; 565 } */ 566 int error; 567 struct sys_recvfrom_args bra; 568 569 SCARG(&bra, s) = SCARG(uap, s); 570 SCARG(&bra, buf) = SCARG(uap, buf); 571 SCARG(&bra, len) = SCARG(uap, len); 572 SCARG(&bra, flags) = SCARG(uap, flags); 573 SCARG(&bra, from) = (struct sockaddr *) SCARG(uap, from); 574 SCARG(&bra, fromlenaddr) = (socklen_t *)SCARG(uap, fromlenaddr); 575 576 if ((error = sys_recvfrom(l, &bra, retval))) 577 return (error); 578 579 if (SCARG(uap, from) && (error = linux_sa_put(SCARG(uap, from)))) 580 return (error); 581 582 return (0); 583 } 584 585 static int 586 linux_copyout_msg_control(struct lwp *l, struct msghdr *mp, struct mbuf *control) 587 { 588 int dlen, error = 0; 589 struct cmsghdr *cmsg; 590 struct linux_cmsghdr linux_cmsg; 591 struct mbuf *m; 592 char *q, *q_end; 593 594 if (mp->msg_controllen <= 0 || control == 0) { 595 mp->msg_controllen = 0; 596 free_control_mbuf(l, control, control); 597 return 0; 598 } 599 600 q = (char *)mp->msg_control; 601 q_end = q + mp->msg_controllen; 602 603 for (m = control; m != NULL; ) { 604 cmsg = mtod(m, struct cmsghdr *); 605 606 /* 607 * Fixup cmsg. We handle two things: 608 * 0. different sizeof cmsg_len. 609 * 1. different values for level/type on some archs 610 * 2. different alignment of CMSG_DATA on some archs 611 */ 612 linux_cmsg.cmsg_len = cmsg->cmsg_len - LINUX_CMSG_ALIGN_DELTA; 613 linux_cmsg.cmsg_level = cmsg->cmsg_level; 614 linux_cmsg.cmsg_type = cmsg->cmsg_type; 615 616 dlen = q_end - q; 617 if (linux_cmsg.cmsg_len > dlen) { 618 /* Not enough room for the parameter */ 619 dlen -= sizeof linux_cmsg; 620 if (dlen <= 0) 621 /* Discard if header wont fit */ 622 break; 623 mp->msg_flags |= MSG_CTRUNC; 624 if (linux_cmsg.cmsg_level == SOL_SOCKET 625 && linux_cmsg.cmsg_type == SCM_RIGHTS) 626 /* Do not truncate me ... */ 627 break; 628 } else 629 dlen = linux_cmsg.cmsg_len - sizeof linux_cmsg; 630 631 switch (linux_cmsg.cmsg_level) { 632 case SOL_SOCKET: 633 linux_cmsg.cmsg_level = LINUX_SOL_SOCKET; 634 switch (linux_cmsg.cmsg_type) { 635 case SCM_RIGHTS: 636 /* Linux SCM_RIGHTS is same as NetBSD */ 637 break; 638 639 default: 640 /* other types not supported */ 641 error = EINVAL; 642 goto done; 643 } 644 /* machine dependant ! */ 645 break; 646 default: 647 /* pray and leave intact */ 648 break; 649 } 650 651 /* There can be padding between the header and data... */ 652 error = copyout(&linux_cmsg, q, sizeof *cmsg); 653 if (error != 0) { 654 error = copyout(CCMSG_DATA(cmsg), q + sizeof linux_cmsg, 655 dlen); 656 } 657 if (error != 0) { 658 /* We must free all the SCM_RIGHTS */ 659 m = control; 660 break; 661 } 662 m = m->m_next; 663 if (m == NULL || q + LINUX_CMSG_ALIGN(dlen) > q_end) { 664 q += dlen; 665 break; 666 } 667 q += LINUX_CMSG_ALIGN(dlen); 668 } 669 670 done: 671 free_control_mbuf(l, control, m); 672 673 mp->msg_controllen = q - (char *)mp->msg_control; 674 return error; 675 } 676 677 int 678 linux_sys_recvmsg(struct lwp *l, const struct linux_sys_recvmsg_args *uap, register_t *retval) 679 { 680 /* { 681 syscallarg(int) s; 682 syscallarg(struct msghdr *) msg; 683 syscallarg(u_int) flags; 684 } */ 685 struct msghdr msg; 686 int error; 687 struct mbuf *from, *control; 688 689 error = copyin(SCARG(uap, msg), &msg, sizeof(msg)); 690 if (error) 691 return (error); 692 693 msg.msg_flags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 694 if (msg.msg_flags < 0) { 695 /* Some unsupported flag */ 696 return (EINVAL); 697 } 698 msg.msg_flags |= MSG_IOVUSRSPACE; 699 700 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, 701 msg.msg_control != NULL ? &control : NULL, retval); 702 if (error != 0) 703 return error; 704 705 if (msg.msg_control != NULL) 706 error = linux_copyout_msg_control(l, &msg, control); 707 708 if (error == 0 && from != 0) { 709 mtod(from, struct osockaddr *)->sa_family = 710 bsd_to_linux_domain(mtod(from, struct sockaddr *)->sa_family); 711 error = copyout_sockname(msg.msg_name, &msg.msg_namelen, 0, 712 from); 713 } else 714 msg.msg_namelen = 0; 715 716 if (from != NULL) 717 m_free(from); 718 719 if (error == 0) { 720 msg.msg_flags = bsd_to_linux_msg_flags(msg.msg_flags); 721 if (msg.msg_flags < 0) 722 /* Some flag unsupported by Linux */ 723 error = EINVAL; 724 else 725 error = copyout(&msg, SCARG(uap, msg), sizeof(msg)); 726 } 727 728 return (error); 729 } 730 731 /* 732 * Convert socket option level from Linux to NetBSD value. Only SOL_SOCKET 733 * is different, the rest matches IPPROTO_* on both systems. 734 */ 735 int 736 linux_to_bsd_sopt_level(int llevel) 737 { 738 739 switch (llevel) { 740 case LINUX_SOL_SOCKET: 741 return SOL_SOCKET; 742 case LINUX_SOL_IP: 743 return IPPROTO_IP; 744 case LINUX_SOL_TCP: 745 return IPPROTO_TCP; 746 case LINUX_SOL_UDP: 747 return IPPROTO_UDP; 748 default: 749 return -1; 750 } 751 } 752 753 /* 754 * Convert Linux socket level socket option numbers to NetBSD values. 755 */ 756 int 757 linux_to_bsd_so_sockopt(int lopt) 758 { 759 760 switch (lopt) { 761 case LINUX_SO_DEBUG: 762 return SO_DEBUG; 763 case LINUX_SO_REUSEADDR: 764 /* 765 * Linux does not implement SO_REUSEPORT, but allows reuse of a 766 * host:port pair through SO_REUSEADDR even if the address is not a 767 * multicast-address. Effectively, this means that we should use 768 * SO_REUSEPORT to allow Linux applications to not exit with 769 * EADDRINUSE 770 */ 771 return SO_REUSEPORT; 772 case LINUX_SO_TYPE: 773 return SO_TYPE; 774 case LINUX_SO_ERROR: 775 return SO_ERROR; 776 case LINUX_SO_DONTROUTE: 777 return SO_DONTROUTE; 778 case LINUX_SO_BROADCAST: 779 return SO_BROADCAST; 780 case LINUX_SO_SNDBUF: 781 return SO_SNDBUF; 782 case LINUX_SO_RCVBUF: 783 return SO_RCVBUF; 784 case LINUX_SO_KEEPALIVE: 785 return SO_KEEPALIVE; 786 case LINUX_SO_OOBINLINE: 787 return SO_OOBINLINE; 788 case LINUX_SO_LINGER: 789 return SO_LINGER; 790 case LINUX_SO_PRIORITY: 791 case LINUX_SO_NO_CHECK: 792 default: 793 return -1; 794 } 795 } 796 797 /* 798 * Convert Linux IP level socket option number to NetBSD values. 799 */ 800 int 801 linux_to_bsd_ip_sockopt(int lopt) 802 { 803 804 switch (lopt) { 805 case LINUX_IP_TOS: 806 return IP_TOS; 807 case LINUX_IP_TTL: 808 return IP_TTL; 809 case LINUX_IP_MULTICAST_TTL: 810 return IP_MULTICAST_TTL; 811 case LINUX_IP_MULTICAST_LOOP: 812 return IP_MULTICAST_LOOP; 813 case LINUX_IP_MULTICAST_IF: 814 return IP_MULTICAST_IF; 815 case LINUX_IP_ADD_MEMBERSHIP: 816 return IP_ADD_MEMBERSHIP; 817 case LINUX_IP_DROP_MEMBERSHIP: 818 return IP_DROP_MEMBERSHIP; 819 default: 820 return -1; 821 } 822 } 823 824 /* 825 * Convert Linux TCP level socket option number to NetBSD values. 826 */ 827 int 828 linux_to_bsd_tcp_sockopt(int lopt) 829 { 830 831 switch (lopt) { 832 case LINUX_TCP_NODELAY: 833 return TCP_NODELAY; 834 case LINUX_TCP_MAXSEG: 835 return TCP_MAXSEG; 836 default: 837 return -1; 838 } 839 } 840 841 /* 842 * Convert Linux UDP level socket option number to NetBSD values. 843 */ 844 int 845 linux_to_bsd_udp_sockopt(int lopt) 846 { 847 848 switch (lopt) { 849 default: 850 return -1; 851 } 852 } 853 854 /* 855 * Another reasonably straightforward function: setsockopt(2). 856 * The level and option numbers are converted; the values passed 857 * are not (yet) converted, the ones currently implemented don't 858 * need conversion, as they are the same on both systems. 859 */ 860 int 861 linux_sys_setsockopt(struct lwp *l, const struct linux_sys_setsockopt_args *uap, register_t *retval) 862 { 863 /* { 864 syscallarg(int) s; 865 syscallarg(int) level; 866 syscallarg(int) optname; 867 syscallarg(void *) optval; 868 syscallarg(int) optlen; 869 } */ 870 struct sys_setsockopt_args bsa; 871 int name; 872 873 SCARG(&bsa, s) = SCARG(uap, s); 874 SCARG(&bsa, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 875 SCARG(&bsa, val) = SCARG(uap, optval); 876 SCARG(&bsa, valsize) = SCARG(uap, optlen); 877 878 /* 879 * Linux supports only SOL_SOCKET for AF_LOCAL domain sockets 880 * and returns EOPNOTSUPP for other levels 881 */ 882 if (SCARG(&bsa, level) != SOL_SOCKET) { 883 struct socket *so; 884 int error, family; 885 886 /* fd_getsock() will use the descriptor for us */ 887 if ((error = fd_getsock(SCARG(&bsa, s), &so)) != 0) 888 return error; 889 family = so->so_proto->pr_domain->dom_family; 890 fd_putfile(SCARG(&bsa, s)); 891 892 if (family == AF_LOCAL) 893 return EOPNOTSUPP; 894 } 895 896 switch (SCARG(&bsa, level)) { 897 case SOL_SOCKET: 898 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 899 break; 900 case IPPROTO_IP: 901 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 902 break; 903 case IPPROTO_TCP: 904 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 905 break; 906 case IPPROTO_UDP: 907 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 908 break; 909 default: 910 return EINVAL; 911 } 912 913 if (name == -1) 914 return EINVAL; 915 SCARG(&bsa, name) = name; 916 917 return sys_setsockopt(l, &bsa, retval); 918 } 919 920 /* 921 * getsockopt(2) is very much the same as setsockopt(2) (see above) 922 */ 923 int 924 linux_sys_getsockopt(struct lwp *l, const struct linux_sys_getsockopt_args *uap, register_t *retval) 925 { 926 /* { 927 syscallarg(int) s; 928 syscallarg(int) level; 929 syscallarg(int) optname; 930 syscallarg(void *) optval; 931 syscallarg(int *) optlen; 932 } */ 933 struct sys_getsockopt_args bga; 934 int name; 935 936 SCARG(&bga, s) = SCARG(uap, s); 937 SCARG(&bga, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 938 SCARG(&bga, val) = SCARG(uap, optval); 939 SCARG(&bga, avalsize) = (socklen_t *)SCARG(uap, optlen); 940 941 switch (SCARG(&bga, level)) { 942 case SOL_SOCKET: 943 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 944 break; 945 case IPPROTO_IP: 946 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 947 break; 948 case IPPROTO_TCP: 949 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 950 break; 951 case IPPROTO_UDP: 952 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 953 break; 954 default: 955 return EINVAL; 956 } 957 958 if (name == -1) 959 return EINVAL; 960 SCARG(&bga, name) = name; 961 962 return sys_getsockopt(l, &bga, retval); 963 } 964 965 int 966 linux_getifconf(struct lwp *l, register_t *retval, void *data) 967 { 968 struct linux_ifreq ifr, *ifrp; 969 struct ifconf *ifc = data; 970 struct ifnet *ifp; 971 struct ifaddr *ifa; 972 struct sockaddr *sa; 973 struct osockaddr *osa; 974 int space, error = 0; 975 const int sz = (int)sizeof(ifr); 976 977 ifrp = (struct linux_ifreq *)ifc->ifc_req; 978 if (ifrp == NULL) 979 space = 0; 980 else 981 space = ifc->ifc_len; 982 983 IFNET_FOREACH(ifp) { 984 (void)strncpy(ifr.ifr_name, ifp->if_xname, 985 sizeof(ifr.ifr_name)); 986 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 987 return ENAMETOOLONG; 988 if (IFADDR_EMPTY(ifp)) 989 continue; 990 IFADDR_FOREACH(ifa, ifp) { 991 sa = ifa->ifa_addr; 992 if (sa->sa_family != AF_INET || 993 sa->sa_len > sizeof(*osa)) 994 continue; 995 memcpy(&ifr.ifr_addr, sa, sa->sa_len); 996 osa = (struct osockaddr *)&ifr.ifr_addr; 997 osa->sa_family = sa->sa_family; 998 if (space >= sz) { 999 error = copyout(&ifr, ifrp, sz); 1000 if (error != 0) 1001 return error; 1002 ifrp++; 1003 } 1004 space -= sz; 1005 } 1006 } 1007 1008 if (ifrp != NULL) 1009 ifc->ifc_len -= space; 1010 else 1011 ifc->ifc_len = -space; 1012 1013 return 0; 1014 } 1015 1016 int 1017 linux_getifhwaddr(struct lwp *l, register_t *retval, u_int fd, 1018 void *data) 1019 { 1020 /* Not the full structure, just enough to map what we do here */ 1021 struct linux_ifreq lreq; 1022 file_t *fp; 1023 struct ifaddr *ifa; 1024 struct ifnet *ifp; 1025 struct sockaddr_dl *sadl; 1026 int error, found; 1027 int index, ifnum; 1028 1029 /* 1030 * We can't emulate this ioctl by calling sys_ioctl() to run 1031 * SIOCGIFCONF, because the user buffer is not of the right 1032 * type to take those results. We can't use kernel buffers to 1033 * receive the results, as the implementation of sys_ioctl() 1034 * and ifconf() [which implements SIOCGIFCONF] use 1035 * copyin()/copyout() which will fail on kernel addresses. 1036 * 1037 * So, we must duplicate code from sys_ioctl() and ifconf(). Ugh. 1038 */ 1039 1040 if ((fp = fd_getfile(fd)) == NULL) 1041 return (EBADF); 1042 1043 KERNEL_LOCK(1, NULL); 1044 1045 if ((fp->f_flag & (FREAD | FWRITE)) == 0) { 1046 error = EBADF; 1047 goto out; 1048 } 1049 1050 error = copyin(data, &lreq, sizeof(lreq)); 1051 if (error) 1052 goto out; 1053 lreq.ifr_name[LINUX_IFNAMSIZ-1] = '\0'; /* just in case */ 1054 1055 /* 1056 * Try real interface name first, then fake "ethX" 1057 */ 1058 found = 0; 1059 IFNET_FOREACH(ifp) { 1060 if (found) 1061 break; 1062 if (strcmp(lreq.ifr_name, ifp->if_xname)) 1063 /* not this interface */ 1064 continue; 1065 found=1; 1066 if (IFADDR_EMPTY(ifp)) { 1067 error = ENODEV; 1068 goto out; 1069 } 1070 IFADDR_FOREACH(ifa, ifp) { 1071 sadl = satosdl(ifa->ifa_addr); 1072 /* only return ethernet addresses */ 1073 /* XXX what about FDDI, etc. ? */ 1074 if (sadl->sdl_family != AF_LINK || 1075 sadl->sdl_type != IFT_ETHER) 1076 continue; 1077 memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl), 1078 MIN(sadl->sdl_alen, 1079 sizeof(lreq.ifr_hwaddr.sa_data))); 1080 lreq.ifr_hwaddr.sa_family = 1081 sadl->sdl_family; 1082 error = copyout(&lreq, data, sizeof(lreq)); 1083 goto out; 1084 } 1085 } 1086 1087 if (strncmp(lreq.ifr_name, "eth", 3) == 0) { 1088 for (ifnum = 0, index = 3; 1089 lreq.ifr_name[index] != '\0' && index < LINUX_IFNAMSIZ; 1090 index++) { 1091 ifnum *= 10; 1092 ifnum += lreq.ifr_name[index] - '0'; 1093 } 1094 1095 error = EINVAL; /* in case we don't find one */ 1096 found = 0; 1097 IFNET_FOREACH(ifp) { 1098 if (found) 1099 break; 1100 memcpy(lreq.ifr_name, ifp->if_xname, 1101 MIN(LINUX_IFNAMSIZ, IFNAMSIZ)); 1102 IFADDR_FOREACH(ifa, ifp) { 1103 sadl = satosdl(ifa->ifa_addr); 1104 /* only return ethernet addresses */ 1105 /* XXX what about FDDI, etc. ? */ 1106 if (sadl->sdl_family != AF_LINK || 1107 sadl->sdl_type != IFT_ETHER) 1108 continue; 1109 if (ifnum--) 1110 /* not the reqested iface */ 1111 continue; 1112 memcpy(&lreq.ifr_hwaddr.sa_data, 1113 CLLADDR(sadl), 1114 MIN(sadl->sdl_alen, 1115 sizeof(lreq.ifr_hwaddr.sa_data))); 1116 lreq.ifr_hwaddr.sa_family = 1117 sadl->sdl_family; 1118 error = copyout(&lreq, data, sizeof(lreq)); 1119 found = 1; 1120 break; 1121 } 1122 } 1123 } else { 1124 /* unknown interface, not even an "eth*" name */ 1125 error = ENODEV; 1126 } 1127 1128 out: 1129 KERNEL_UNLOCK_ONE(NULL); 1130 fd_putfile(fd); 1131 return error; 1132 } 1133 1134 int 1135 linux_ioctl_socket(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 1136 { 1137 /* { 1138 syscallarg(int) fd; 1139 syscallarg(u_long) com; 1140 syscallarg(void *) data; 1141 } */ 1142 u_long com; 1143 int error = 0, isdev = 0, dosys = 1; 1144 struct sys_ioctl_args ia; 1145 file_t *fp; 1146 struct vnode *vp; 1147 int (*ioctlf)(file_t *, u_long, void *); 1148 struct ioctl_pt pt; 1149 1150 if ((fp = fd_getfile(SCARG(uap, fd))) == NULL) 1151 return (EBADF); 1152 1153 if (fp->f_type == DTYPE_VNODE) { 1154 vp = (struct vnode *)fp->f_data; 1155 isdev = vp->v_type == VCHR; 1156 } 1157 1158 /* 1159 * Don't try to interpret socket ioctl calls that are done 1160 * on a device filedescriptor, just pass them through, to 1161 * emulate Linux behaviour. Use PTIOCLINUX so that the 1162 * device will only handle these if it's prepared to do 1163 * so, to avoid unexpected things from happening. 1164 */ 1165 if (isdev) { 1166 dosys = 0; 1167 ioctlf = fp->f_ops->fo_ioctl; 1168 pt.com = SCARG(uap, com); 1169 pt.data = SCARG(uap, data); 1170 error = ioctlf(fp, PTIOCLINUX, &pt); 1171 /* 1172 * XXX hack: if the function returns EJUSTRETURN, 1173 * it has stuffed a sysctl return value in pt.data. 1174 */ 1175 if (error == EJUSTRETURN) { 1176 retval[0] = (register_t)pt.data; 1177 error = 0; 1178 } 1179 goto out; 1180 } 1181 1182 com = SCARG(uap, com); 1183 retval[0] = 0; 1184 1185 switch (com) { 1186 case LINUX_SIOCGIFCONF: 1187 error = linux_getifconf(l, retval, SCARG(uap, data)); 1188 dosys = 0; 1189 break; 1190 case LINUX_SIOCGIFFLAGS: 1191 SCARG(&ia, com) = OSIOCGIFFLAGS; 1192 break; 1193 case LINUX_SIOCSIFFLAGS: 1194 SCARG(&ia, com) = OSIOCSIFFLAGS; 1195 break; 1196 case LINUX_SIOCGIFADDR: 1197 SCARG(&ia, com) = OOSIOCGIFADDR; 1198 break; 1199 case LINUX_SIOCGIFDSTADDR: 1200 SCARG(&ia, com) = OOSIOCGIFDSTADDR; 1201 break; 1202 case LINUX_SIOCGIFBRDADDR: 1203 SCARG(&ia, com) = OOSIOCGIFBRDADDR; 1204 break; 1205 case LINUX_SIOCGIFNETMASK: 1206 SCARG(&ia, com) = OOSIOCGIFNETMASK; 1207 break; 1208 case LINUX_SIOCADDMULTI: 1209 SCARG(&ia, com) = OSIOCADDMULTI; 1210 break; 1211 case LINUX_SIOCDELMULTI: 1212 SCARG(&ia, com) = OSIOCDELMULTI; 1213 break; 1214 case LINUX_SIOCGIFHWADDR: 1215 error = linux_getifhwaddr(l, retval, SCARG(uap, fd), 1216 SCARG(uap, data)); 1217 dosys = 0; 1218 break; 1219 default: 1220 error = EINVAL; 1221 } 1222 1223 out: 1224 fd_putfile(SCARG(uap, fd)); 1225 1226 if (error ==0 && dosys) { 1227 SCARG(&ia, fd) = SCARG(uap, fd); 1228 SCARG(&ia, data) = SCARG(uap, data); 1229 error = sys_ioctl(curlwp, &ia, retval); 1230 } 1231 1232 return error; 1233 } 1234 1235 int 1236 linux_sys_connect(struct lwp *l, const struct linux_sys_connect_args *uap, register_t *retval) 1237 { 1238 /* { 1239 syscallarg(int) s; 1240 syscallarg(const struct sockaddr *) name; 1241 syscallarg(int) namelen; 1242 } */ 1243 int error; 1244 struct mbuf *nam; 1245 1246 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, name), 1247 SCARG(uap, namelen)); 1248 if (error) 1249 return (error); 1250 1251 error = do_sys_connect(l, SCARG(uap, s), nam); 1252 1253 if (error == EISCONN) { 1254 struct socket *so; 1255 int state, prflags, nbio; 1256 1257 /* fd_getsock() will use the descriptor for us */ 1258 if (fd_getsock(SCARG(uap, s), &so) != 0) 1259 return EISCONN; 1260 1261 solock(so); 1262 state = so->so_state; 1263 nbio = so->so_nbio; 1264 prflags = so->so_proto->pr_flags; 1265 sounlock(so); 1266 fd_putfile(SCARG(uap, s)); 1267 /* 1268 * We should only let this call succeed once per 1269 * non-blocking connect; however we don't have 1270 * a convenient place to keep that state.. 1271 */ 1272 if (nbio && (state & SS_ISCONNECTED) && 1273 (prflags & PR_CONNREQUIRED)) 1274 return 0; 1275 } 1276 1277 return (error); 1278 } 1279 1280 int 1281 linux_sys_bind(struct lwp *l, const struct linux_sys_bind_args *uap, register_t *retval) 1282 { 1283 /* { 1284 syscallarg(int) s; 1285 syscallarg(const struct osockaddr *) name; 1286 syscallarg(int) namelen; 1287 } */ 1288 int error; 1289 struct mbuf *nam; 1290 1291 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, name), 1292 SCARG(uap, namelen)); 1293 if (error) 1294 return (error); 1295 1296 return do_sys_bind(l, SCARG(uap, s), nam); 1297 } 1298 1299 int 1300 linux_sys_getsockname(struct lwp *l, const struct linux_sys_getsockname_args *uap, register_t *retval) 1301 { 1302 /* { 1303 syscallarg(int) fdes; 1304 syscallarg(void *) asa; 1305 syscallarg(int *) alen; 1306 } */ 1307 int error; 1308 1309 if ((error = sys_getsockname(l, (const void *)uap, retval)) != 0) 1310 return (error); 1311 1312 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1313 return (error); 1314 1315 return (0); 1316 } 1317 1318 int 1319 linux_sys_getpeername(struct lwp *l, const struct linux_sys_getpeername_args *uap, register_t *retval) 1320 { 1321 /* { 1322 syscallarg(int) fdes; 1323 syscallarg(void *) asa; 1324 syscallarg(int *) alen; 1325 } */ 1326 int error; 1327 1328 if ((error = sys_getpeername(l, (const void *)uap, retval)) != 0) 1329 return (error); 1330 1331 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1332 return (error); 1333 1334 return (0); 1335 } 1336 1337 /* 1338 * Copy the osockaddr structure pointed to by osa to mbuf, adjust 1339 * family and convert to sockaddr. 1340 */ 1341 static int 1342 linux_get_sa(struct lwp *l, int s, struct mbuf **mp, 1343 const struct osockaddr *osa, unsigned int salen) 1344 { 1345 int error, bdom; 1346 struct sockaddr *sa; 1347 struct osockaddr *kosa; 1348 struct mbuf *m; 1349 1350 if (salen == 1 || salen > UCHAR_MAX) { 1351 DPRINTF(("bad osa=%p salen=%d\n", osa, salen)); 1352 return EINVAL; 1353 } 1354 1355 /* We'll need the address in an mbuf later, so copy into one here */ 1356 m = m_get(M_WAIT, MT_SONAME); 1357 if (salen > MLEN) 1358 MEXTMALLOC(m, salen, M_WAITOK); 1359 1360 m->m_len = salen; 1361 1362 if (salen == 0) { 1363 *mp = m; 1364 return 0; 1365 } 1366 1367 kosa = mtod(m, void *); 1368 if ((error = copyin(osa, kosa, salen))) { 1369 DPRINTF(("error %d copying osa %p len %d\n", 1370 error, osa, salen)); 1371 goto bad; 1372 } 1373 1374 ktrkuser("linux sockaddr", kosa, salen); 1375 1376 bdom = linux_to_bsd_domain(kosa->sa_family); 1377 if (bdom == -1) { 1378 DPRINTF(("bad linux family=%d\n", kosa->sa_family)); 1379 error = EINVAL; 1380 goto bad; 1381 } 1382 1383 /* 1384 * If the family is unspecified, use address family of the socket. 1385 * This avoid triggering strict family checks in netinet/in_pcb.c et.al. 1386 */ 1387 if (bdom == AF_UNSPEC) { 1388 struct socket *so; 1389 1390 /* fd_getsock() will use the descriptor for us */ 1391 if ((error = fd_getsock(s, &so)) != 0) 1392 goto bad; 1393 1394 bdom = so->so_proto->pr_domain->dom_family; 1395 fd_putfile(s); 1396 1397 DPRINTF(("AF_UNSPEC family adjusted to %d\n", bdom)); 1398 } 1399 1400 /* 1401 * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6, 1402 * which lacks the scope id compared with RFC2553 one. If we detect 1403 * the situation, reject the address and write a message to system log. 1404 * 1405 * Still accept addresses for which the scope id is not used. 1406 */ 1407 if (bdom == AF_INET6 && salen == sizeof (struct sockaddr_in6) - sizeof (u_int32_t)) { 1408 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)kosa; 1409 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) && 1410 (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1411 IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) || 1412 IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) || 1413 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 1414 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) { 1415 struct proc *p = l->l_proc; 1416 int uid = l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1; 1417 1418 log(LOG_DEBUG, 1419 "pid %d (%s), uid %d: obsolete pre-RFC2553 " 1420 "sockaddr_in6 rejected", 1421 p->p_pid, p->p_comm, uid); 1422 error = EINVAL; 1423 goto bad; 1424 } 1425 salen = sizeof (struct sockaddr_in6); 1426 sin6->sin6_scope_id = 0; 1427 } 1428 1429 if (bdom == AF_INET) 1430 salen = sizeof(struct sockaddr_in); 1431 1432 sa = (struct sockaddr *) kosa; 1433 sa->sa_family = bdom; 1434 sa->sa_len = salen; 1435 m->m_len = salen; 1436 ktrkuser("new sockaddr", kosa, salen); 1437 1438 #ifdef DEBUG_LINUX 1439 DPRINTF(("family %d, len = %d [ ", sa->sa_family, sa->sa_len)); 1440 for (bdom = 0; bdom < sizeof(sa->sa_data); bdom++) 1441 DPRINTF(("%02x ", (unsigned char) sa->sa_data[bdom])); 1442 DPRINTF(("\n")); 1443 #endif 1444 1445 *mp = m; 1446 return 0; 1447 1448 bad: 1449 m_free(m); 1450 return error; 1451 } 1452 1453 static int 1454 linux_sa_put(struct osockaddr *osa) 1455 { 1456 struct sockaddr sa; 1457 struct osockaddr *kosa; 1458 int error, bdom, len; 1459 1460 /* 1461 * Only read/write the sockaddr family and length part, the rest is 1462 * not changed. 1463 */ 1464 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 1465 1466 error = copyin(osa, &sa, len); 1467 if (error) 1468 return (error); 1469 1470 bdom = bsd_to_linux_domain(sa.sa_family); 1471 if (bdom == -1) 1472 return (EINVAL); 1473 1474 /* Note: we convert from sockaddr to osockaddr here, too */ 1475 kosa = (struct osockaddr *) &sa; 1476 kosa->sa_family = bdom; 1477 error = copyout(kosa, osa, len); 1478 if (error) 1479 return (error); 1480 1481 return (0); 1482 } 1483 1484 #ifndef __amd64__ 1485 int 1486 linux_sys_recv(struct lwp *l, const struct linux_sys_recv_args *uap, register_t *retval) 1487 { 1488 /* { 1489 syscallarg(int) s; 1490 syscallarg(void *) buf; 1491 syscallarg(int) len; 1492 syscallarg(int) flags; 1493 } */ 1494 struct sys_recvfrom_args bra; 1495 1496 1497 SCARG(&bra, s) = SCARG(uap, s); 1498 SCARG(&bra, buf) = SCARG(uap, buf); 1499 SCARG(&bra, len) = (size_t) SCARG(uap, len); 1500 SCARG(&bra, flags) = SCARG(uap, flags); 1501 SCARG(&bra, from) = NULL; 1502 SCARG(&bra, fromlenaddr) = NULL; 1503 1504 return (sys_recvfrom(l, &bra, retval)); 1505 } 1506 1507 int 1508 linux_sys_send(struct lwp *l, const struct linux_sys_send_args *uap, register_t *retval) 1509 { 1510 /* { 1511 syscallarg(int) s; 1512 syscallarg(void *) buf; 1513 syscallarg(int) len; 1514 syscallarg(int) flags; 1515 } */ 1516 struct sys_sendto_args bsa; 1517 1518 SCARG(&bsa, s) = SCARG(uap, s); 1519 SCARG(&bsa, buf) = SCARG(uap, buf); 1520 SCARG(&bsa, len) = SCARG(uap, len); 1521 SCARG(&bsa, flags) = SCARG(uap, flags); 1522 SCARG(&bsa, to) = NULL; 1523 SCARG(&bsa, tolen) = 0; 1524 1525 return (sys_sendto(l, &bsa, retval)); 1526 } 1527 #endif 1528 1529 int 1530 linux_sys_accept(struct lwp *l, const struct linux_sys_accept_args *uap, register_t *retval) 1531 { 1532 /* { 1533 syscallarg(int) s; 1534 syscallarg(struct osockaddr *) name; 1535 syscallarg(int *) anamelen; 1536 } */ 1537 int error; 1538 struct sys_accept_args baa; 1539 1540 SCARG(&baa, s) = SCARG(uap, s); 1541 SCARG(&baa, name) = (struct sockaddr *) SCARG(uap, name); 1542 SCARG(&baa, anamelen) = (unsigned int *) SCARG(uap, anamelen); 1543 1544 if ((error = sys_accept(l, &baa, retval))) 1545 return (error); 1546 1547 if (SCARG(uap, name) && (error = linux_sa_put(SCARG(uap, name)))) 1548 return (error); 1549 1550 return (0); 1551 } 1552