1 /* $NetBSD: linux_socket.c,v 1.156 2024/10/01 16:41:29 riastradh 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 1.156 2024/10/01 16:41:29 riastradh 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_sched.h> 86 #include <compat/linux/common/linux_socket.h> 87 #include <compat/linux/common/linux_fcntl.h> 88 #if !defined(__aarch64__) && !defined(__alpha__) && !defined(__amd64__) 89 #include <compat/linux/common/linux_socketcall.h> 90 #endif 91 #include <compat/linux/common/linux_sockio.h> 92 #include <compat/linux/common/linux_ipc.h> 93 #include <compat/linux/common/linux_sem.h> 94 95 #include <compat/linux/linux_syscallargs.h> 96 97 #ifdef DEBUG_LINUX 98 #define DPRINTF(a) uprintf a 99 #else 100 #define DPRINTF(a) 101 #endif 102 103 /* 104 * The calls in this file are entered either via the linux_socketcall() 105 * interface or, on the Alpha, as individual syscalls. The 106 * linux_socketcall function does any massaging of arguments so that all 107 * the calls in here need not think that they are anything other 108 * than a normal syscall. 109 */ 110 111 static int linux_to_bsd_domain(int); 112 static int bsd_to_linux_domain(int); 113 static int linux_to_bsd_type(int); 114 int linux_to_bsd_sopt_level(int); 115 int linux_to_bsd_so_sockopt(int); 116 int linux_to_bsd_ip_sockopt(int); 117 int linux_to_bsd_ipv6_sockopt(int); 118 int linux_to_bsd_tcp_sockopt(int); 119 int linux_to_bsd_udp_sockopt(int); 120 int linux_getifname(struct lwp *, register_t *, void *); 121 int linux_getifconf(struct lwp *, register_t *, void *); 122 int linux_getifhwaddr(struct lwp *, register_t *, u_int, void *); 123 static int linux_get_sa(struct lwp *, int, struct sockaddr_big *, 124 const struct osockaddr *, socklen_t); 125 static int linux_sa_put(struct osockaddr *osa); 126 static int linux_to_bsd_msg_flags(int); 127 static int bsd_to_linux_msg_flags(int); 128 static void linux_to_bsd_msghdr(const struct linux_msghdr *, struct msghdr *); 129 static void bsd_to_linux_msghdr(const struct msghdr *, struct linux_msghdr *); 130 131 static const int linux_to_bsd_domain_[LINUX_AF_MAX] = { 132 AF_UNSPEC, 133 AF_UNIX, 134 AF_INET, 135 AF_CCITT, /* LINUX_AF_AX25 */ 136 AF_IPX, 137 AF_APPLETALK, 138 -1, /* LINUX_AF_NETROM */ 139 -1, /* LINUX_AF_BRIDGE */ 140 -1, /* LINUX_AF_ATMPVC */ 141 AF_CCITT, /* LINUX_AF_X25 */ 142 AF_INET6, 143 -1, /* LINUX_AF_ROSE */ 144 AF_DECnet, 145 -1, /* LINUX_AF_NETBEUI */ 146 -1, /* LINUX_AF_SECURITY */ 147 pseudo_AF_KEY, 148 AF_ROUTE, /* LINUX_AF_NETLINK */ 149 -1, /* LINUX_AF_PACKET */ 150 -1, /* LINUX_AF_ASH */ 151 -1, /* LINUX_AF_ECONET */ 152 -1, /* LINUX_AF_ATMSVC */ 153 AF_SNA, 154 /* rest up to LINUX_AF_MAX-1 is not allocated */ 155 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 156 }; 157 158 static const int bsd_to_linux_domain_[AF_MAX] = { 159 LINUX_AF_UNSPEC, 160 LINUX_AF_UNIX, 161 LINUX_AF_INET, 162 -1, /* AF_IMPLINK */ 163 -1, /* AF_PUP */ 164 -1, /* AF_CHAOS */ 165 -1, /* AF_NS */ 166 -1, /* AF_ISO */ 167 -1, /* AF_ECMA */ 168 -1, /* AF_DATAKIT */ 169 LINUX_AF_AX25, /* AF_CCITT */ 170 LINUX_AF_SNA, 171 LINUX_AF_DECnet, 172 -1, /* AF_DLI */ 173 -1, /* AF_LAT */ 174 -1, /* AF_HYLINK */ 175 LINUX_AF_APPLETALK, 176 LINUX_AF_NETLINK, 177 -1, /* AF_LINK */ 178 -1, /* AF_XTP */ 179 -1, /* AF_COIP */ 180 -1, /* AF_CNT */ 181 -1, /* pseudo_AF_RTIP */ 182 LINUX_AF_IPX, 183 LINUX_AF_INET6, 184 -1, /* pseudo_AF_PIP */ 185 -1, /* AF_ISDN */ 186 -1, /* AF_NATM */ 187 -1, /* AF_ARP */ 188 LINUX_pseudo_AF_KEY, 189 -1, /* pseudo_AF_HDRCMPLT */ 190 }; 191 192 static const struct { 193 int bfl; 194 int lfl; 195 } bsd_to_linux_msg_flags_[] = { 196 {MSG_OOB, LINUX_MSG_OOB}, 197 {MSG_PEEK, LINUX_MSG_PEEK}, 198 {MSG_DONTROUTE, LINUX_MSG_DONTROUTE}, 199 {MSG_EOR, LINUX_MSG_EOR}, 200 {MSG_TRUNC, LINUX_MSG_TRUNC}, 201 {MSG_CTRUNC, LINUX_MSG_CTRUNC}, 202 {MSG_WAITALL, LINUX_MSG_WAITALL}, 203 {MSG_DONTWAIT, LINUX_MSG_DONTWAIT}, 204 {MSG_BCAST, 0}, /* not supported, clear */ 205 {MSG_MCAST, 0}, /* not supported, clear */ 206 {MSG_NOSIGNAL, LINUX_MSG_NOSIGNAL}, 207 {-1, /* not supp */ LINUX_MSG_PROBE}, 208 {-1, /* not supp */ LINUX_MSG_FIN}, 209 {-1, /* not supp */ LINUX_MSG_SYN}, 210 {-1, /* not supp */ LINUX_MSG_CONFIRM}, 211 {-1, /* not supp */ LINUX_MSG_RST}, 212 {-1, /* not supp */ LINUX_MSG_ERRQUEUE}, 213 {-1, /* not supp */ LINUX_MSG_MORE}, 214 }; 215 216 /* 217 * Convert between Linux and BSD socket domain values 218 */ 219 static int 220 linux_to_bsd_domain(int ldom) 221 { 222 if (ldom < 0 || ldom >= LINUX_AF_MAX) 223 return (-1); 224 225 return linux_to_bsd_domain_[ldom]; 226 } 227 228 /* 229 * Convert between BSD and Linux socket domain values 230 */ 231 static int 232 bsd_to_linux_domain(int bdom) 233 { 234 if (bdom < 0 || bdom >= AF_MAX) 235 return (-1); 236 237 return bsd_to_linux_domain_[bdom]; 238 } 239 240 static int 241 linux_to_bsd_type(int ltype) 242 { 243 int type, flags; 244 245 /* Real types are identical between Linux and NetBSD */ 246 type = ltype & LINUX_SOCK_TYPE_MASK; 247 248 /* But flags are not .. */ 249 flags = ltype & ~LINUX_SOCK_TYPE_MASK; 250 if (flags & ~(LINUX_SOCK_CLOEXEC|LINUX_SOCK_NONBLOCK)) 251 return -1; 252 253 if (flags & LINUX_SOCK_CLOEXEC) 254 type |= SOCK_CLOEXEC; 255 if (flags & LINUX_SOCK_NONBLOCK) 256 type |= SOCK_NONBLOCK; 257 258 return type; 259 } 260 261 static int 262 linux_to_bsd_msg_flags(int lflag) 263 { 264 int i, lfl, bfl; 265 int bflag = 0; 266 267 if (lflag == 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 (lfl == 0) 275 continue; 276 277 if (lflag & lfl) { 278 if (bfl < 0) 279 return (-1); 280 281 bflag |= bfl; 282 } 283 } 284 285 return (bflag); 286 } 287 288 static int 289 bsd_to_linux_msg_flags(int bflag) 290 { 291 int i, lfl, bfl; 292 int lflag = 0; 293 294 if (bflag == 0) 295 return (0); 296 297 for(i = 0; i < __arraycount(bsd_to_linux_msg_flags_); i++) { 298 bfl = bsd_to_linux_msg_flags_[i].bfl; 299 lfl = bsd_to_linux_msg_flags_[i].lfl; 300 301 if (bfl <= 0) 302 continue; 303 304 if (bflag & bfl) { 305 if (lfl < 0) 306 return (-1); 307 308 lflag |= lfl; 309 } 310 } 311 312 return (lflag); 313 } 314 315 int 316 linux_sys_socket(struct lwp *l, const struct linux_sys_socket_args *uap, register_t *retval) 317 { 318 /* { 319 syscallarg(int) domain; 320 syscallarg(int) type; 321 syscallarg(int) protocol; 322 } */ 323 struct sys___socket30_args bsa; 324 int error; 325 326 327 SCARG(&bsa, protocol) = SCARG(uap, protocol); 328 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 329 if (SCARG(&bsa, domain) == -1) 330 return EINVAL; 331 SCARG(&bsa, type) = linux_to_bsd_type(SCARG(uap, type)); 332 if (SCARG(&bsa, type) == -1) 333 return EINVAL; 334 /* 335 * Apparently linux uses this to talk to ISDN sockets. If we fail 336 * now programs seems to handle it, but if we don't we are going 337 * to fail when we bind and programs don't handle this well. 338 */ 339 if (SCARG(&bsa, domain) == AF_ROUTE && SCARG(&bsa, type) == SOCK_RAW) 340 return ENOTSUP; 341 error = sys___socket30(l, &bsa, retval); 342 343 #ifdef INET6 344 /* 345 * Linux AF_INET6 socket has IPV6_V6ONLY setsockopt set to 0 by 346 * default and some apps depend on this. So, set V6ONLY to 0 347 * for Linux apps if the sysctl value is set to 1. 348 */ 349 if (!error && ip6_v6only && SCARG(&bsa, domain) == PF_INET6) { 350 struct socket *so; 351 352 if (fd_getsock(*retval, &so) == 0) { 353 int val = 0; 354 355 /* ignore error */ 356 (void)so_setsockopt(l, so, IPPROTO_IPV6, IPV6_V6ONLY, 357 &val, sizeof(val)); 358 359 fd_putfile(*retval); 360 } 361 } 362 #endif 363 364 return (error); 365 } 366 367 int 368 linux_sys_socketpair(struct lwp *l, const struct linux_sys_socketpair_args *uap, register_t *retval) 369 { 370 /* { 371 syscallarg(int) domain; 372 syscallarg(int) type; 373 syscallarg(int) protocol; 374 syscallarg(int *) rsv; 375 } */ 376 struct sys_socketpair_args bsa; 377 378 SCARG(&bsa, domain) = linux_to_bsd_domain(SCARG(uap, domain)); 379 if (SCARG(&bsa, domain) == -1) 380 return EINVAL; 381 SCARG(&bsa, type) = linux_to_bsd_type(SCARG(uap, type)); 382 if (SCARG(&bsa, type) == -1) 383 return EINVAL; 384 SCARG(&bsa, protocol) = SCARG(uap, protocol); 385 SCARG(&bsa, rsv) = SCARG(uap, rsv); 386 387 return sys_socketpair(l, &bsa, retval); 388 } 389 390 int 391 linux_sys_sendto(struct lwp *l, const struct linux_sys_sendto_args *uap, register_t *retval) 392 { 393 /* { 394 syscallarg(int) s; 395 syscallarg(void *) msg; 396 syscallarg(int) len; 397 syscallarg(int) flags; 398 syscallarg(struct osockaddr *) to; 399 syscallarg(int) tolen; 400 } */ 401 struct msghdr msg; 402 struct iovec aiov; 403 struct sockaddr_big nam; 404 struct mbuf *m; 405 int bflags; 406 int error; 407 408 /* Translate message flags. */ 409 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 410 if (bflags < 0) 411 /* Some supported flag */ 412 return EINVAL; 413 414 msg.msg_flags = 0; 415 msg.msg_name = NULL; 416 msg.msg_control = NULL; 417 418 if (SCARG(uap, tolen)) { 419 /* Read in and convert the sockaddr */ 420 error = linux_get_sa(l, SCARG(uap, s), &nam, SCARG(uap, to), 421 SCARG(uap, tolen)); 422 if (error) 423 return error; 424 error = sockargs(&m, &nam, nam.sb_len, UIO_SYSSPACE, MT_SONAME); 425 if (error) 426 return error; 427 msg.msg_flags |= MSG_NAMEMBUF; 428 msg.msg_name = m; 429 msg.msg_namelen = nam.sb_len; 430 } 431 432 msg.msg_iov = &aiov; 433 msg.msg_iovlen = 1; 434 aiov.iov_base = __UNCONST(SCARG(uap, msg)); 435 aiov.iov_len = SCARG(uap, len); 436 437 return do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval); 438 } 439 440 static void 441 linux_to_bsd_msghdr(const struct linux_msghdr *lmsg, struct msghdr *bmsg) 442 { 443 memset(bmsg, 0, sizeof(*bmsg)); 444 bmsg->msg_name = lmsg->msg_name; 445 bmsg->msg_namelen = lmsg->msg_namelen; 446 bmsg->msg_iov = lmsg->msg_iov; 447 bmsg->msg_iovlen = lmsg->msg_iovlen; 448 bmsg->msg_control = lmsg->msg_control; 449 bmsg->msg_controllen = lmsg->msg_controllen; 450 bmsg->msg_flags = lmsg->msg_flags; 451 } 452 453 static void 454 bsd_to_linux_msghdr(const struct msghdr *bmsg, struct linux_msghdr *lmsg) 455 { 456 memset(lmsg, 0, sizeof(*lmsg)); 457 lmsg->msg_name = bmsg->msg_name; 458 lmsg->msg_namelen = bmsg->msg_namelen; 459 lmsg->msg_iov = bmsg->msg_iov; 460 lmsg->msg_iovlen = bmsg->msg_iovlen; 461 lmsg->msg_control = bmsg->msg_control; 462 lmsg->msg_controllen = bmsg->msg_controllen; 463 lmsg->msg_flags = bmsg->msg_flags; 464 } 465 466 int 467 linux_sys_sendmsg(struct lwp *l, const struct linux_sys_sendmsg_args *uap, register_t *retval) 468 { 469 /* { 470 syscallarg(int) s; 471 syscallarg(struct linux_msghdr *) msg; 472 syscallarg(u_int) flags; 473 } */ 474 struct msghdr msg; 475 struct linux_msghdr lmsg; 476 int error; 477 int bflags; 478 struct sockaddr_big nam; 479 u_int8_t *control; 480 struct mbuf *ctl_mbuf = NULL; 481 482 error = copyin(SCARG(uap, msg), &lmsg, sizeof(lmsg)); 483 if (error) 484 return error; 485 linux_to_bsd_msghdr(&lmsg, &msg); 486 487 msg.msg_flags = MSG_IOVUSRSPACE; 488 489 /* 490 * Translate message flags. 491 */ 492 bflags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 493 if (bflags < 0) 494 /* Some supported flag */ 495 return EINVAL; 496 497 if (lmsg.msg_name) { 498 /* Read in and convert the sockaddr */ 499 error = linux_get_sa(l, SCARG(uap, s), &nam, msg.msg_name, 500 msg.msg_namelen); 501 if (error) 502 return (error); 503 msg.msg_name = &nam; 504 } 505 506 /* 507 * Handle cmsg if there is any. 508 */ 509 if (LINUX_CMSG_FIRSTHDR(&lmsg)) { 510 struct linux_cmsghdr l_cmsg, *l_cc; 511 struct cmsghdr *cmsg; 512 ssize_t resid = msg.msg_controllen; 513 size_t clen, cidx = 0, cspace; 514 515 ctl_mbuf = m_get(M_WAIT, MT_CONTROL); 516 clen = MLEN; 517 control = mtod(ctl_mbuf, void *); 518 519 l_cc = LINUX_CMSG_FIRSTHDR(&lmsg); 520 do { 521 error = copyin(l_cc, &l_cmsg, sizeof(l_cmsg)); 522 if (error) 523 goto done; 524 525 /* 526 * Sanity check the control message length. 527 */ 528 if (l_cmsg.cmsg_len > resid 529 || l_cmsg.cmsg_len < sizeof l_cmsg) { 530 error = EINVAL; 531 goto done; 532 } 533 534 /* 535 * Refuse unsupported control messages, and 536 * translate fields as appropriate. 537 */ 538 switch (l_cmsg.cmsg_level) { 539 case LINUX_SOL_SOCKET: 540 /* It only differs on some archs */ 541 if (LINUX_SOL_SOCKET != SOL_SOCKET) 542 l_cmsg.cmsg_level = SOL_SOCKET; 543 544 switch(l_cmsg.cmsg_type) { 545 case LINUX_SCM_RIGHTS: 546 /* Linux SCM_RIGHTS is same as NetBSD */ 547 break; 548 549 case LINUX_SCM_CREDENTIALS: 550 /* no native equivalent, just drop it */ 551 if (control != mtod(ctl_mbuf, void *)) 552 free(control, M_MBUF); 553 m_free(ctl_mbuf); 554 ctl_mbuf = NULL; 555 msg.msg_control = NULL; 556 msg.msg_controllen = 0; 557 goto skipcmsg; 558 559 default: 560 /* other types not supported */ 561 error = EINVAL; 562 goto done; 563 } 564 break; 565 default: 566 /* pray and leave intact */ 567 break; 568 } 569 570 cspace = CMSG_SPACE(l_cmsg.cmsg_len - sizeof(l_cmsg)); 571 572 /* Check the buffer is big enough */ 573 if (__predict_false(cidx + cspace > clen)) { 574 u_int8_t *nc; 575 size_t nclen; 576 577 nclen = cidx + cspace; 578 if (nclen >= PAGE_SIZE) { 579 error = EINVAL; 580 goto done; 581 } 582 nc = realloc(clen <= MLEN ? NULL : control, 583 nclen, M_TEMP, M_WAITOK); 584 if (!nc) { 585 error = ENOMEM; 586 goto done; 587 } 588 if (cidx <= MLEN) 589 /* Old buffer was in mbuf... */ 590 memcpy(nc, control, cidx); 591 control = nc; 592 clen = nclen; 593 } 594 595 /* Copy header */ 596 cmsg = (void *)&control[cidx]; 597 cmsg->cmsg_len = l_cmsg.cmsg_len + LINUX_CMSG_ALIGN_DELTA; 598 cmsg->cmsg_level = l_cmsg.cmsg_level; 599 cmsg->cmsg_type = l_cmsg.cmsg_type; 600 601 /* Zero area between header and data */ 602 memset(cmsg + 1, 0, 603 CMSG_ALIGN(sizeof(*cmsg)) - sizeof(*cmsg)); 604 605 /* Copyin the data */ 606 error = copyin(LINUX_CMSG_DATA(l_cc), 607 CMSG_DATA(cmsg), 608 l_cmsg.cmsg_len - sizeof(l_cmsg)); 609 if (error) 610 goto done; 611 612 resid -= LINUX_CMSG_ALIGN(l_cmsg.cmsg_len); 613 cidx += cspace; 614 } while ((l_cc = LINUX_CMSG_NXTHDR(&msg, l_cc, &l_cmsg)) && resid > 0); 615 616 /* If we allocated a buffer, attach to mbuf */ 617 if (cidx > MLEN) { 618 MEXTADD(ctl_mbuf, control, clen, M_MBUF, NULL, NULL); 619 ctl_mbuf->m_flags |= M_EXT_RW; 620 } 621 control = NULL; 622 ctl_mbuf->m_len = cidx; 623 624 msg.msg_control = ctl_mbuf; 625 msg.msg_flags |= MSG_CONTROLMBUF; 626 627 ktrkuser("mbcontrol", mtod(ctl_mbuf, void *), 628 msg.msg_controllen); 629 } 630 631 skipcmsg: 632 error = do_sys_sendmsg(l, SCARG(uap, s), &msg, bflags, retval); 633 /* Freed internally */ 634 ctl_mbuf = NULL; 635 636 done: 637 if (ctl_mbuf != NULL) { 638 if (control != NULL && control != mtod(ctl_mbuf, void *)) 639 free(control, M_MBUF); 640 m_free(ctl_mbuf); 641 } 642 return (error); 643 } 644 645 int 646 linux_sys_recvfrom(struct lwp *l, const struct linux_sys_recvfrom_args *uap, register_t *retval) 647 { 648 /* { 649 syscallarg(int) s; 650 syscallarg(void *) buf; 651 syscallarg(int) len; 652 syscallarg(int) flags; 653 syscallarg(struct osockaddr *) from; 654 syscallarg(int *) fromlenaddr; 655 } */ 656 int error; 657 struct sys_recvfrom_args bra; 658 659 SCARG(&bra, s) = SCARG(uap, s); 660 SCARG(&bra, buf) = SCARG(uap, buf); 661 SCARG(&bra, len) = SCARG(uap, len); 662 SCARG(&bra, flags) = SCARG(uap, flags); 663 SCARG(&bra, from) = (struct sockaddr *) SCARG(uap, from); 664 SCARG(&bra, fromlenaddr) = (socklen_t *)SCARG(uap, fromlenaddr); 665 666 if ((error = sys_recvfrom(l, &bra, retval))) 667 return (error); 668 669 if (SCARG(uap, from) && (error = linux_sa_put(SCARG(uap, from)))) 670 return (error); 671 672 return (0); 673 } 674 675 static int 676 linux_copyout_msg_control(struct lwp *l, struct msghdr *mp, struct mbuf *control) 677 { 678 int dlen, error = 0; 679 struct cmsghdr *cmsg; 680 struct linux_cmsghdr linux_cmsg; 681 struct mbuf *m; 682 char *q, *q_end; 683 684 if (mp->msg_controllen <= 0 || control == 0) { 685 mp->msg_controllen = 0; 686 free_control_mbuf(l, control, control); 687 return 0; 688 } 689 690 ktrkuser("msgcontrol", mtod(control, void *), mp->msg_controllen); 691 692 q = (char *)mp->msg_control; 693 q_end = q + mp->msg_controllen; 694 695 for (m = control; m != NULL; ) { 696 cmsg = mtod(m, struct cmsghdr *); 697 698 /* 699 * Fixup cmsg. We handle two things: 700 * 0. different sizeof cmsg_len. 701 * 1. different values for level/type on some archs 702 * 2. different alignment of CMSG_DATA on some archs 703 */ 704 memset(&linux_cmsg, 0, sizeof(linux_cmsg)); 705 linux_cmsg.cmsg_len = cmsg->cmsg_len - LINUX_CMSG_ALIGN_DELTA; 706 linux_cmsg.cmsg_level = cmsg->cmsg_level; 707 linux_cmsg.cmsg_type = cmsg->cmsg_type; 708 709 dlen = q_end - q; 710 if (linux_cmsg.cmsg_len > dlen) { 711 /* Not enough room for the parameter */ 712 dlen -= sizeof linux_cmsg; 713 if (dlen <= 0) 714 /* Discard if header wont fit */ 715 break; 716 mp->msg_flags |= MSG_CTRUNC; 717 if (linux_cmsg.cmsg_level == SOL_SOCKET 718 && linux_cmsg.cmsg_type == SCM_RIGHTS) 719 /* Do not truncate me ... */ 720 break; 721 } else 722 dlen = linux_cmsg.cmsg_len - sizeof linux_cmsg; 723 724 switch (linux_cmsg.cmsg_level) { 725 case SOL_SOCKET: 726 linux_cmsg.cmsg_level = LINUX_SOL_SOCKET; 727 switch (linux_cmsg.cmsg_type) { 728 case SCM_RIGHTS: 729 /* Linux SCM_RIGHTS is same as NetBSD */ 730 break; 731 732 default: 733 /* other types not supported */ 734 error = EINVAL; 735 goto done; 736 } 737 /* machine dependent ! */ 738 break; 739 default: 740 /* pray and leave intact */ 741 break; 742 } 743 744 /* There can be padding between the header and data... */ 745 error = copyout(&linux_cmsg, q, sizeof linux_cmsg); 746 if (error != 0) { 747 error = copyout(CCMSG_DATA(cmsg), q + sizeof linux_cmsg, 748 dlen); 749 } 750 if (error != 0) { 751 /* We must free all the SCM_RIGHTS */ 752 m = control; 753 break; 754 } 755 m = m->m_next; 756 if (m == NULL || q + LINUX_CMSG_SPACE(dlen) > q_end) { 757 q += LINUX_CMSG_LEN(dlen); 758 break; 759 } 760 q += LINUX_CMSG_SPACE(dlen); 761 } 762 763 done: 764 free_control_mbuf(l, control, m); 765 766 mp->msg_controllen = q - (char *)mp->msg_control; 767 return error; 768 } 769 770 int 771 linux_sys_recvmsg(struct lwp *l, const struct linux_sys_recvmsg_args *uap, register_t *retval) 772 { 773 /* { 774 syscallarg(int) s; 775 syscallarg(struct linux_msghdr *) msg; 776 syscallarg(u_int) flags; 777 } */ 778 struct msghdr msg; 779 struct linux_msghdr lmsg; 780 int error; 781 struct mbuf *from, *control; 782 783 error = copyin(SCARG(uap, msg), &lmsg, sizeof(lmsg)); 784 if (error) 785 return (error); 786 linux_to_bsd_msghdr(&lmsg, &msg); 787 788 msg.msg_flags = linux_to_bsd_msg_flags(SCARG(uap, flags)); 789 if (msg.msg_flags < 0) { 790 /* Some unsupported flag */ 791 return (EINVAL); 792 } 793 msg.msg_flags |= MSG_IOVUSRSPACE; 794 795 error = do_sys_recvmsg(l, SCARG(uap, s), &msg, &from, 796 msg.msg_control != NULL ? &control : NULL, retval); 797 if (error != 0) 798 return error; 799 800 if (msg.msg_control != NULL) 801 error = linux_copyout_msg_control(l, &msg, control); 802 803 if (error == 0 && from != 0) { 804 mtod(from, struct osockaddr *)->sa_family = 805 bsd_to_linux_domain(mtod(from, struct sockaddr *)->sa_family); 806 error = copyout_sockname(msg.msg_name, &msg.msg_namelen, 0, 807 from); 808 } else 809 msg.msg_namelen = 0; 810 811 if (from != NULL) 812 m_free(from); 813 814 if (error == 0) { 815 msg.msg_flags = bsd_to_linux_msg_flags(msg.msg_flags); 816 if (msg.msg_flags < 0) 817 /* Some flag unsupported by Linux */ 818 error = EINVAL; 819 else { 820 ktrkuser("msghdr", &msg, sizeof(msg)); 821 bsd_to_linux_msghdr(&msg, &lmsg); 822 error = copyout(&lmsg, SCARG(uap, msg), sizeof(lmsg)); 823 } 824 } 825 826 return (error); 827 } 828 829 /* 830 * Convert socket option level from Linux to NetBSD value. Only SOL_SOCKET 831 * is different, the rest matches IPPROTO_* on both systems. 832 */ 833 int 834 linux_to_bsd_sopt_level(int llevel) 835 { 836 837 switch (llevel) { 838 case LINUX_SOL_SOCKET: 839 return SOL_SOCKET; 840 case LINUX_SOL_IP: 841 return IPPROTO_IP; 842 #ifdef INET6 843 case LINUX_SOL_IPV6: 844 return IPPROTO_IPV6; 845 #endif 846 case LINUX_SOL_TCP: 847 return IPPROTO_TCP; 848 case LINUX_SOL_UDP: 849 return IPPROTO_UDP; 850 default: 851 return -1; 852 } 853 } 854 855 /* 856 * Convert Linux socket level socket option numbers to NetBSD values. 857 */ 858 int 859 linux_to_bsd_so_sockopt(int lopt) 860 { 861 862 switch (lopt) { 863 case LINUX_SO_DEBUG: 864 return SO_DEBUG; 865 case LINUX_SO_REUSEADDR: 866 /* 867 * Linux does not implement SO_REUSEPORT, but allows reuse of 868 * a host:port pair through SO_REUSEADDR even if the address 869 * is not a multicast-address. Effectively, this means that we 870 * should use SO_REUSEPORT to allow Linux applications to not 871 * exit with EADDRINUSE 872 */ 873 return SO_REUSEPORT; 874 case LINUX_SO_TYPE: 875 return SO_TYPE; 876 case LINUX_SO_ERROR: 877 return SO_ERROR; 878 case LINUX_SO_DONTROUTE: 879 return SO_DONTROUTE; 880 case LINUX_SO_BROADCAST: 881 return SO_BROADCAST; 882 case LINUX_SO_SNDBUF: 883 return SO_SNDBUF; 884 case LINUX_SO_RCVBUF: 885 return SO_RCVBUF; 886 case LINUX_SO_KEEPALIVE: 887 return SO_KEEPALIVE; 888 case LINUX_SO_OOBINLINE: 889 return SO_OOBINLINE; 890 case LINUX_SO_NO_CHECK: 891 case LINUX_SO_PRIORITY: 892 return -1; 893 case LINUX_SO_LINGER: 894 return SO_LINGER; 895 case LINUX_SO_BSDCOMPAT: 896 case LINUX_SO_PASSCRED: 897 case LINUX_SO_PEERCRED: 898 return -1; 899 case LINUX_SO_RCVLOWAT: 900 return SO_RCVLOWAT; 901 case LINUX_SO_SNDLOWAT: 902 return SO_SNDLOWAT; 903 case LINUX_SO_RCVTIMEO: 904 return SO_RCVTIMEO; 905 case LINUX_SO_SNDTIMEO: 906 return SO_SNDTIMEO; 907 case LINUX_SO_SECURITY_AUTHENTICATION: 908 case LINUX_SO_SECURITY_ENCRYPTION_TRANSPORT: 909 case LINUX_SO_SECURITY_ENCRYPTION_NETWORK: 910 case LINUX_SO_BINDTODEVICE: 911 case LINUX_SO_ATTACH_FILTER: 912 case LINUX_SO_DETACH_FILTER: 913 case LINUX_SO_PEERNAME: 914 return -1; 915 case LINUX_SO_TIMESTAMP: 916 return SO_TIMESTAMP; 917 case LINUX_SO_ACCEPTCONN: 918 case LINUX_SO_PEERSEC: 919 case LINUX_SO_SNDBUFFORCE: 920 case LINUX_SO_RCVBUFFORCE: 921 case LINUX_SO_PASSSEC: 922 case LINUX_SO_TIMESTAMPNS: 923 case LINUX_SO_MARK: 924 case LINUX_SO_TIMESTAMPING: 925 case LINUX_SO_PROTOCOL: 926 case LINUX_SO_DOMAIN: 927 case LINUX_SO_RXQ_OVFL: 928 case LINUX_SO_WIFI_STATUS: 929 case LINUX_SO_PEEK_OFF: 930 case LINUX_SO_NOFCS: 931 default: 932 return -1; 933 } 934 } 935 936 /* 937 * Convert Linux IP level socket option number to NetBSD values. 938 */ 939 int 940 linux_to_bsd_ip_sockopt(int lopt) 941 { 942 943 switch (lopt) { 944 case LINUX_IP_TOS: 945 return IP_TOS; 946 case LINUX_IP_TTL: 947 return IP_TTL; 948 case LINUX_IP_HDRINCL: 949 return IP_HDRINCL; 950 case LINUX_IP_MULTICAST_TTL: 951 return IP_MULTICAST_TTL; 952 case LINUX_IP_MULTICAST_LOOP: 953 return IP_MULTICAST_LOOP; 954 case LINUX_IP_MULTICAST_IF: 955 return IP_MULTICAST_IF; 956 case LINUX_IP_ADD_MEMBERSHIP: 957 return IP_ADD_MEMBERSHIP; 958 case LINUX_IP_DROP_MEMBERSHIP: 959 return IP_DROP_MEMBERSHIP; 960 case LINUX_IP_RECVERR: 961 return -2; /* ignored */ 962 default: 963 return -1; 964 } 965 } 966 967 /* 968 * Convert Linux IPV6 level socket option number to NetBSD values. 969 */ 970 #ifdef INET6 971 int 972 linux_to_bsd_ipv6_sockopt(int lopt) 973 { 974 975 switch (lopt) { 976 case LINUX_IPV6_V6ONLY: 977 return IPV6_V6ONLY; 978 default: 979 return -1; 980 } 981 } 982 #endif 983 984 /* 985 * Convert Linux TCP level socket option number to NetBSD values. 986 */ 987 int 988 linux_to_bsd_tcp_sockopt(int lopt) 989 { 990 991 switch (lopt) { 992 case LINUX_TCP_NODELAY: 993 return TCP_NODELAY; 994 case LINUX_TCP_MAXSEG: 995 return TCP_MAXSEG; 996 default: 997 return -1; 998 } 999 } 1000 1001 /* 1002 * Convert Linux UDP level socket option number to NetBSD values. 1003 */ 1004 int 1005 linux_to_bsd_udp_sockopt(int lopt) 1006 { 1007 1008 switch (lopt) { 1009 default: 1010 return -1; 1011 } 1012 } 1013 1014 /* 1015 * Another reasonably straightforward function: setsockopt(2). 1016 * The level and option numbers are converted; the values passed 1017 * are not (yet) converted, the ones currently implemented don't 1018 * need conversion, as they are the same on both systems. 1019 */ 1020 int 1021 linux_sys_setsockopt(struct lwp *l, const struct linux_sys_setsockopt_args *uap, register_t *retval) 1022 { 1023 /* { 1024 syscallarg(int) s; 1025 syscallarg(int) level; 1026 syscallarg(int) optname; 1027 syscallarg(void *) optval; 1028 syscallarg(int) optlen; 1029 } */ 1030 struct sys_setsockopt_args bsa; 1031 int name; 1032 1033 SCARG(&bsa, s) = SCARG(uap, s); 1034 SCARG(&bsa, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 1035 SCARG(&bsa, val) = SCARG(uap, optval); 1036 SCARG(&bsa, valsize) = SCARG(uap, optlen); 1037 1038 /* 1039 * Linux supports only SOL_SOCKET for AF_LOCAL domain sockets 1040 * and returns EOPNOTSUPP for other levels 1041 */ 1042 if (SCARG(&bsa, level) != SOL_SOCKET) { 1043 struct socket *so; 1044 int error, family; 1045 1046 /* fd_getsock() will use the descriptor for us */ 1047 if ((error = fd_getsock(SCARG(&bsa, s), &so)) != 0) 1048 return error; 1049 family = so->so_proto->pr_domain->dom_family; 1050 fd_putfile(SCARG(&bsa, s)); 1051 1052 if (family == AF_LOCAL) 1053 return EOPNOTSUPP; 1054 } 1055 1056 switch (SCARG(&bsa, level)) { 1057 case SOL_SOCKET: 1058 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 1059 break; 1060 case IPPROTO_IP: 1061 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 1062 break; 1063 #ifdef INET6 1064 case IPPROTO_IPV6: 1065 name = linux_to_bsd_ipv6_sockopt(SCARG(uap, optname)); 1066 break; 1067 #endif 1068 case IPPROTO_TCP: 1069 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 1070 break; 1071 case IPPROTO_UDP: 1072 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 1073 break; 1074 default: 1075 return EINVAL; 1076 } 1077 1078 if (name == -1) 1079 return EINVAL; 1080 if (name == -2) 1081 return 0; 1082 SCARG(&bsa, name) = name; 1083 1084 return sys_setsockopt(l, &bsa, retval); 1085 } 1086 1087 /* 1088 * getsockopt(2) is very much the same as setsockopt(2) (see above) 1089 */ 1090 int 1091 linux_sys_getsockopt(struct lwp *l, const struct linux_sys_getsockopt_args *uap, register_t *retval) 1092 { 1093 /* { 1094 syscallarg(int) s; 1095 syscallarg(int) level; 1096 syscallarg(int) optname; 1097 syscallarg(void *) optval; 1098 syscallarg(int *) optlen; 1099 } */ 1100 struct sys_getsockopt_args bga; 1101 int name; 1102 1103 SCARG(&bga, s) = SCARG(uap, s); 1104 SCARG(&bga, level) = linux_to_bsd_sopt_level(SCARG(uap, level)); 1105 SCARG(&bga, val) = SCARG(uap, optval); 1106 SCARG(&bga, avalsize) = (socklen_t *)SCARG(uap, optlen); 1107 1108 switch (SCARG(&bga, level)) { 1109 case SOL_SOCKET: 1110 name = linux_to_bsd_so_sockopt(SCARG(uap, optname)); 1111 break; 1112 case IPPROTO_IP: 1113 name = linux_to_bsd_ip_sockopt(SCARG(uap, optname)); 1114 break; 1115 #ifdef INET6 1116 case IPPROTO_IPV6: 1117 name = linux_to_bsd_ipv6_sockopt(SCARG(uap, optname)); 1118 break; 1119 #endif 1120 case IPPROTO_TCP: 1121 name = linux_to_bsd_tcp_sockopt(SCARG(uap, optname)); 1122 break; 1123 case IPPROTO_UDP: 1124 name = linux_to_bsd_udp_sockopt(SCARG(uap, optname)); 1125 break; 1126 default: 1127 return EINVAL; 1128 } 1129 1130 if (name == -1) 1131 return EINVAL; 1132 SCARG(&bga, name) = name; 1133 1134 return sys_getsockopt(l, &bga, retval); 1135 } 1136 1137 int 1138 linux_getifname(struct lwp *l, register_t *retval, void *data) 1139 { 1140 struct ifnet *ifp; 1141 struct linux_ifreq ifr; 1142 int error; 1143 int s; 1144 1145 error = copyin(data, &ifr, sizeof(ifr)); 1146 if (error) 1147 return error; 1148 1149 s = pserialize_read_enter(); 1150 ifp = if_byindex(ifr.ifr_ifru.ifru_ifindex); 1151 if (ifp == NULL) { 1152 pserialize_read_exit(s); 1153 return ENODEV; 1154 } 1155 1156 strncpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)); 1157 pserialize_read_exit(s); 1158 1159 return copyout(&ifr, data, sizeof(ifr)); 1160 } 1161 1162 int 1163 linux_getifconf(struct lwp *l, register_t *retval, void *data) 1164 { 1165 struct linux_ifreq ifr, *ifrp = NULL; 1166 struct linux_ifconf ifc; 1167 struct ifnet *ifp; 1168 struct sockaddr *sa; 1169 struct osockaddr *osa; 1170 int space = 0, error; 1171 const int sz = (int)sizeof(ifr); 1172 bool docopy; 1173 int s; 1174 int bound; 1175 struct psref psref; 1176 1177 error = copyin(data, &ifc, sizeof(ifc)); 1178 if (error) 1179 return error; 1180 1181 docopy = ifc.ifc_req != NULL; 1182 if (docopy) { 1183 if (ifc.ifc_len < 0) 1184 return EINVAL; 1185 1186 space = ifc.ifc_len; 1187 ifrp = ifc.ifc_req; 1188 } 1189 memset(&ifr, 0, sizeof(ifr)); 1190 1191 bound = curlwp_bind(); 1192 s = pserialize_read_enter(); 1193 IFNET_READER_FOREACH(ifp) { 1194 struct ifaddr *ifa; 1195 if_acquire(ifp, &psref); 1196 pserialize_read_exit(s); 1197 1198 (void)strncpy(ifr.ifr_name, ifp->if_xname, 1199 sizeof(ifr.ifr_name)); 1200 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') { 1201 error = ENAMETOOLONG; 1202 goto release_exit; 1203 } 1204 1205 s = pserialize_read_enter(); 1206 IFADDR_READER_FOREACH(ifa, ifp) { 1207 struct psref psref_ifa; 1208 ifa_acquire(ifa, &psref_ifa); 1209 pserialize_read_exit(s); 1210 1211 sa = ifa->ifa_addr; 1212 if (sa->sa_family != AF_INET || 1213 sa->sa_len > sizeof(*osa)) 1214 goto next; 1215 memcpy(&ifr.ifr_addr, sa, sa->sa_len); 1216 osa = (struct osockaddr *)&ifr.ifr_addr; 1217 osa->sa_family = sa->sa_family; 1218 if (space >= sz) { 1219 error = copyout(&ifr, ifrp, sz); 1220 if (error != 0) { 1221 ifa_release(ifa, &psref_ifa); 1222 goto release_exit; 1223 } 1224 ifrp++; 1225 } 1226 space -= sz; 1227 next: 1228 s = pserialize_read_enter(); 1229 ifa_release(ifa, &psref_ifa); 1230 } 1231 1232 KASSERT(pserialize_in_read_section()); 1233 if_release(ifp, &psref); 1234 } 1235 pserialize_read_exit(s); 1236 curlwp_bindx(bound); 1237 1238 if (docopy) 1239 ifc.ifc_len -= space; 1240 else 1241 ifc.ifc_len = -space; 1242 1243 return copyout(&ifc, data, sizeof(ifc)); 1244 1245 release_exit: 1246 if_release(ifp, &psref); 1247 curlwp_bindx(bound); 1248 return error; 1249 } 1250 1251 int 1252 linux_getifhwaddr(struct lwp *l, register_t *retval, u_int fd, 1253 void *data) 1254 { 1255 /* Not the full structure, just enough to map what we do here */ 1256 struct linux_ifreq lreq; 1257 file_t *fp; 1258 struct ifaddr *ifa; 1259 struct ifnet *ifp; 1260 struct sockaddr_dl *sadl; 1261 int error, found; 1262 int index, ifnum; 1263 int s; 1264 1265 /* 1266 * We can't emulate this ioctl by calling sys_ioctl() to run 1267 * SIOCGIFCONF, because the user buffer is not of the right 1268 * type to take those results. We can't use kernel buffers to 1269 * receive the results, as the implementation of sys_ioctl() 1270 * and ifconf() [which implements SIOCGIFCONF] use 1271 * copyin()/copyout() which will fail on kernel addresses. 1272 * 1273 * So, we must duplicate code from sys_ioctl() and ifconf(). Ugh. 1274 */ 1275 1276 if ((fp = fd_getfile(fd)) == NULL) 1277 return (EBADF); 1278 1279 KERNEL_LOCK(1, NULL); 1280 1281 if ((fp->f_flag & (FREAD | FWRITE)) == 0) { 1282 error = EBADF; 1283 goto out; 1284 } 1285 1286 error = copyin(data, &lreq, sizeof(lreq)); 1287 if (error) 1288 goto out; 1289 lreq.ifr_name[LINUX_IFNAMSIZ-1] = '\0'; /* just in case */ 1290 1291 /* 1292 * Try real interface name first, then fake "ethX" 1293 */ 1294 found = 0; 1295 s = pserialize_read_enter(); 1296 IFNET_READER_FOREACH(ifp) { 1297 if (found) 1298 break; 1299 if (strcmp(lreq.ifr_name, ifp->if_xname)) 1300 /* not this interface */ 1301 continue; 1302 1303 found=1; 1304 if (IFADDR_READER_EMPTY(ifp)) { 1305 pserialize_read_exit(s); 1306 error = ENODEV; 1307 goto out; 1308 } 1309 IFADDR_READER_FOREACH(ifa, ifp) { 1310 sadl = satosdl(ifa->ifa_addr); 1311 /* only return ethernet addresses */ 1312 /* XXX what about FDDI, etc. ? */ 1313 if (sadl->sdl_family != AF_LINK || 1314 sadl->sdl_type != IFT_ETHER) 1315 continue; 1316 memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl), 1317 MIN(sadl->sdl_alen, 1318 sizeof(lreq.ifr_hwaddr.sa_data))); 1319 lreq.ifr_hwaddr.sa_family = 1320 sadl->sdl_family; 1321 pserialize_read_exit(s); 1322 1323 error = copyout(&lreq, data, sizeof(lreq)); 1324 goto out; 1325 } 1326 } 1327 pserialize_read_exit(s); 1328 1329 if (strncmp(lreq.ifr_name, "eth", 3) != 0) { 1330 /* unknown interface, not even an "eth*" name */ 1331 error = ENODEV; 1332 goto out; 1333 } 1334 1335 for (ifnum = 0, index = 3; 1336 index < LINUX_IFNAMSIZ && lreq.ifr_name[index] != '\0'; 1337 index++) { 1338 ifnum *= 10; 1339 ifnum += lreq.ifr_name[index] - '0'; 1340 } 1341 1342 error = EINVAL; /* in case we don't find one */ 1343 s = pserialize_read_enter(); 1344 IFNET_READER_FOREACH(ifp) { 1345 memcpy(lreq.ifr_name, ifp->if_xname, 1346 MIN(LINUX_IFNAMSIZ, IFNAMSIZ)); 1347 IFADDR_READER_FOREACH(ifa, ifp) { 1348 sadl = satosdl(ifa->ifa_addr); 1349 /* only return ethernet addresses */ 1350 /* XXX what about FDDI, etc. ? */ 1351 if (sadl->sdl_family != AF_LINK || 1352 sadl->sdl_type != IFT_ETHER) 1353 continue; 1354 if (ifnum--) 1355 /* not the requested iface */ 1356 continue; 1357 memcpy(&lreq.ifr_hwaddr.sa_data, 1358 CLLADDR(sadl), 1359 MIN(sadl->sdl_alen, 1360 sizeof(lreq.ifr_hwaddr.sa_data))); 1361 lreq.ifr_hwaddr.sa_family = 1362 sadl->sdl_family; 1363 pserialize_read_exit(s); 1364 1365 error = copyout(&lreq, data, sizeof(lreq)); 1366 goto out; 1367 } 1368 } 1369 pserialize_read_exit(s); 1370 1371 out: 1372 KERNEL_UNLOCK_ONE(NULL); 1373 fd_putfile(fd); 1374 return error; 1375 } 1376 1377 int 1378 linux_ioctl_socket(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 1379 { 1380 /* { 1381 syscallarg(int) fd; 1382 syscallarg(u_long) com; 1383 syscallarg(void *) data; 1384 } */ 1385 u_long com; 1386 int error = 0, isdev = 0, dosys = 1; 1387 struct sys_ioctl_args ia; 1388 file_t *fp; 1389 struct vnode *vp; 1390 int (*ioctlf)(file_t *, u_long, void *); 1391 struct ioctl_pt pt; 1392 1393 if ((fp = fd_getfile(SCARG(uap, fd))) == NULL) 1394 return (EBADF); 1395 1396 if (fp->f_type == DTYPE_VNODE) { 1397 vp = (struct vnode *)fp->f_data; 1398 isdev = vp->v_type == VCHR; 1399 } 1400 1401 /* 1402 * Don't try to interpret socket ioctl calls that are done 1403 * on a device filedescriptor, just pass them through, to 1404 * emulate Linux behaviour. Use PTIOCLINUX so that the 1405 * device will only handle these if it's prepared to do 1406 * so, to avoid unexpected things from happening. 1407 */ 1408 if (isdev) { 1409 dosys = 0; 1410 ioctlf = fp->f_ops->fo_ioctl; 1411 pt.com = SCARG(uap, com); 1412 pt.data = SCARG(uap, data); 1413 error = ioctlf(fp, PTIOCLINUX, &pt); 1414 /* 1415 * XXX hack: if the function returns EJUSTRETURN, 1416 * it has stuffed a sysctl return value in pt.data. 1417 */ 1418 if (error == EJUSTRETURN) { 1419 retval[0] = (register_t)pt.data; 1420 error = 0; 1421 } 1422 goto out; 1423 } 1424 1425 com = SCARG(uap, com); 1426 retval[0] = 0; 1427 1428 switch (com) { 1429 case LINUX_SIOCGIFNAME: 1430 error = linux_getifname(l, retval, SCARG(uap, data)); 1431 dosys = 0; 1432 break; 1433 case LINUX_SIOCGIFCONF: 1434 error = linux_getifconf(l, retval, SCARG(uap, data)); 1435 dosys = 0; 1436 break; 1437 case LINUX_SIOCGIFFLAGS: 1438 SCARG(&ia, com) = OSIOCGIFFLAGS; 1439 break; 1440 case LINUX_SIOCSIFFLAGS: 1441 SCARG(&ia, com) = OSIOCSIFFLAGS; 1442 break; 1443 case LINUX_SIOCGIFADDR: 1444 SCARG(&ia, com) = OOSIOCGIFADDR; 1445 break; 1446 case LINUX_SIOCGIFDSTADDR: 1447 SCARG(&ia, com) = OOSIOCGIFDSTADDR; 1448 break; 1449 case LINUX_SIOCGIFBRDADDR: 1450 SCARG(&ia, com) = OOSIOCGIFBRDADDR; 1451 break; 1452 case LINUX_SIOCGIFNETMASK: 1453 SCARG(&ia, com) = OOSIOCGIFNETMASK; 1454 break; 1455 case LINUX_SIOCGIFMTU: 1456 SCARG(&ia, com) = OSIOCGIFMTU; 1457 break; 1458 case LINUX_SIOCADDMULTI: 1459 SCARG(&ia, com) = OSIOCADDMULTI; 1460 break; 1461 case LINUX_SIOCDELMULTI: 1462 SCARG(&ia, com) = OSIOCDELMULTI; 1463 break; 1464 case LINUX_SIOCGIFHWADDR: 1465 error = linux_getifhwaddr(l, retval, SCARG(uap, fd), 1466 SCARG(uap, data)); 1467 dosys = 0; 1468 break; 1469 default: 1470 error = EINVAL; 1471 } 1472 1473 out: 1474 fd_putfile(SCARG(uap, fd)); 1475 1476 if (error ==0 && dosys) { 1477 SCARG(&ia, fd) = SCARG(uap, fd); 1478 SCARG(&ia, data) = SCARG(uap, data); 1479 error = sys_ioctl(curlwp, &ia, retval); 1480 } 1481 1482 return error; 1483 } 1484 1485 int 1486 linux_sys_connect(struct lwp *l, const struct linux_sys_connect_args *uap, register_t *retval) 1487 { 1488 /* { 1489 syscallarg(int) s; 1490 syscallarg(const struct sockaddr *) name; 1491 syscallarg(int) namelen; 1492 } */ 1493 int error; 1494 struct sockaddr_big sb; 1495 1496 error = linux_get_sa(l, SCARG(uap, s), &sb, SCARG(uap, name), 1497 SCARG(uap, namelen)); 1498 if (error) 1499 return (error); 1500 1501 error = do_sys_connect(l, SCARG(uap, s), (struct sockaddr *)&sb); 1502 1503 if (error == EISCONN) { 1504 struct socket *so; 1505 int state, prflags; 1506 1507 /* fd_getsock() will use the descriptor for us */ 1508 if (fd_getsock(SCARG(uap, s), &so) != 0) 1509 return EISCONN; 1510 1511 solock(so); 1512 state = so->so_state; 1513 prflags = so->so_proto->pr_flags; 1514 sounlock(so); 1515 fd_putfile(SCARG(uap, s)); 1516 /* 1517 * We should only let this call succeed once per 1518 * non-blocking connect; however we don't have 1519 * a convenient place to keep that state.. 1520 */ 1521 if ((state & (SS_ISCONNECTED|SS_NBIO)) == 1522 (SS_ISCONNECTED|SS_NBIO) && 1523 (prflags & PR_CONNREQUIRED)) 1524 return 0; 1525 } 1526 1527 return (error); 1528 } 1529 1530 int 1531 linux_sys_bind(struct lwp *l, const struct linux_sys_bind_args *uap, register_t *retval) 1532 { 1533 /* { 1534 syscallarg(int) s; 1535 syscallarg(const struct osockaddr *) name; 1536 syscallarg(int) namelen; 1537 } */ 1538 int error; 1539 struct sockaddr_big sb; 1540 1541 error = linux_get_sa(l, SCARG(uap, s), &sb, SCARG(uap, name), 1542 SCARG(uap, namelen)); 1543 if (error) 1544 return (error); 1545 1546 return do_sys_bind(l, SCARG(uap, s), (struct sockaddr *)&sb); 1547 } 1548 1549 int 1550 linux_sys_getsockname(struct lwp *l, const struct linux_sys_getsockname_args *uap, register_t *retval) 1551 { 1552 /* { 1553 syscallarg(int) fdes; 1554 syscallarg(void *) asa; 1555 syscallarg(int *) alen; 1556 } */ 1557 int error; 1558 1559 if ((error = sys_getsockname(l, (const void *)uap, retval)) != 0) 1560 return (error); 1561 1562 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1563 return (error); 1564 1565 return (0); 1566 } 1567 1568 int 1569 linux_sys_getpeername(struct lwp *l, const struct linux_sys_getpeername_args *uap, register_t *retval) 1570 { 1571 /* { 1572 syscallarg(int) fdes; 1573 syscallarg(void *) asa; 1574 syscallarg(int *) alen; 1575 } */ 1576 int error; 1577 1578 if ((error = sys_getpeername(l, (const void *)uap, retval)) != 0) 1579 return (error); 1580 1581 if ((error = linux_sa_put((struct osockaddr *)SCARG(uap, asa)))) 1582 return (error); 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * Copy the osockaddr structure pointed to by name to sb, adjust 1589 * family and convert to sockaddr. 1590 */ 1591 static int 1592 linux_get_sa(struct lwp *l, int s, struct sockaddr_big *sb, 1593 const struct osockaddr *name, socklen_t namelen) 1594 { 1595 int error, bdom; 1596 1597 if (namelen > UCHAR_MAX || 1598 namelen <= offsetof(struct sockaddr_big, sb_data)) 1599 return EINVAL; 1600 1601 error = copyin(name, sb, namelen); 1602 if (error) 1603 return error; 1604 1605 bdom = linux_to_bsd_domain(sb->sb_family); 1606 if (bdom == -1) 1607 return EINVAL; 1608 1609 /* 1610 * If the family is unspecified, use address family of the socket. 1611 * This avoid triggering strict family checks in netinet/in_pcb.c et.al. 1612 */ 1613 if (bdom == AF_UNSPEC) { 1614 struct socket *so; 1615 1616 /* fd_getsock() will use the descriptor for us */ 1617 if ((error = fd_getsock(s, &so)) != 0) 1618 return error; 1619 1620 bdom = so->so_proto->pr_domain->dom_family; 1621 fd_putfile(s); 1622 } 1623 1624 /* 1625 * Older Linux IPv6 code uses obsolete RFC2133 struct sockaddr_in6, 1626 * which lacks the scope id compared with RFC2553 one. If we detect 1627 * the situation, reject the address and write a message to system log. 1628 * 1629 * Still accept addresses for which the scope id is not used. 1630 */ 1631 if (bdom == AF_INET6 && 1632 namelen == sizeof(struct sockaddr_in6) - sizeof(uint32_t)) { 1633 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sb; 1634 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) && 1635 (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || 1636 IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) || 1637 IN6_IS_ADDR_V4COMPAT(&sin6->sin6_addr) || 1638 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 1639 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) { 1640 struct proc *p = l->l_proc; 1641 int uid = l->l_cred ? kauth_cred_geteuid(l->l_cred) : -1; 1642 1643 log(LOG_DEBUG, 1644 "pid %d (%s), uid %d: obsolete pre-RFC2553 " 1645 "sockaddr_in6 rejected", 1646 p->p_pid, p->p_comm, uid); 1647 return EINVAL; 1648 } 1649 namelen = sizeof(struct sockaddr_in6); 1650 sin6->sin6_scope_id = 0; 1651 } 1652 1653 /* 1654 * Linux is less strict than NetBSD and permits namelen to be larger 1655 * than valid struct sockaddr_in*. If this is the case, truncate 1656 * the value to the correct size, so that NetBSD networking does not 1657 * return an error. 1658 */ 1659 switch (bdom) { 1660 case AF_INET: 1661 namelen = MIN(namelen, sizeof(struct sockaddr_in)); 1662 break; 1663 case AF_INET6: 1664 namelen = MIN(namelen, sizeof(struct sockaddr_in6)); 1665 break; 1666 } 1667 1668 sb->sb_family = bdom; 1669 sb->sb_len = namelen; 1670 ktrkuser("mbsoname", sb, namelen); 1671 return 0; 1672 } 1673 1674 static int 1675 linux_sa_put(struct osockaddr *osa) 1676 { 1677 struct sockaddr sa; 1678 struct osockaddr *kosa; 1679 int error, bdom, len; 1680 1681 /* 1682 * Only read/write the sockaddr family and length part, the rest is 1683 * not changed. 1684 */ 1685 len = sizeof(sa.sa_len) + sizeof(sa.sa_family); 1686 1687 error = copyin(osa, &sa, len); 1688 if (error) 1689 return (error); 1690 1691 bdom = bsd_to_linux_domain(sa.sa_family); 1692 if (bdom == -1) 1693 return (EINVAL); 1694 1695 /* Note: we convert from sockaddr to osockaddr here, too */ 1696 kosa = (struct osockaddr *) &sa; 1697 kosa->sa_family = bdom; 1698 error = copyout(kosa, osa, len); 1699 if (error) 1700 return (error); 1701 1702 return (0); 1703 } 1704 1705 #if !defined(__aarch64__) && !defined(__amd64__) 1706 int 1707 linux_sys_recv(struct lwp *l, const struct linux_sys_recv_args *uap, register_t *retval) 1708 { 1709 /* { 1710 syscallarg(int) s; 1711 syscallarg(void *) buf; 1712 syscallarg(int) len; 1713 syscallarg(int) flags; 1714 } */ 1715 struct sys_recvfrom_args bra; 1716 1717 1718 SCARG(&bra, s) = SCARG(uap, s); 1719 SCARG(&bra, buf) = SCARG(uap, buf); 1720 SCARG(&bra, len) = (size_t) SCARG(uap, len); 1721 SCARG(&bra, flags) = SCARG(uap, flags); 1722 SCARG(&bra, from) = NULL; 1723 SCARG(&bra, fromlenaddr) = NULL; 1724 1725 return (sys_recvfrom(l, &bra, retval)); 1726 } 1727 1728 int 1729 linux_sys_send(struct lwp *l, const struct linux_sys_send_args *uap, register_t *retval) 1730 { 1731 /* { 1732 syscallarg(int) s; 1733 syscallarg(void *) buf; 1734 syscallarg(int) len; 1735 syscallarg(int) flags; 1736 } */ 1737 struct sys_sendto_args bsa; 1738 1739 SCARG(&bsa, s) = SCARG(uap, s); 1740 SCARG(&bsa, buf) = SCARG(uap, buf); 1741 SCARG(&bsa, len) = SCARG(uap, len); 1742 SCARG(&bsa, flags) = SCARG(uap, flags); 1743 SCARG(&bsa, to) = NULL; 1744 SCARG(&bsa, tolen) = 0; 1745 1746 return (sys_sendto(l, &bsa, retval)); 1747 } 1748 #endif 1749 1750 int 1751 linux_sys_accept(struct lwp *l, const struct linux_sys_accept_args *uap, register_t *retval) 1752 { 1753 /* { 1754 syscallarg(int) s; 1755 syscallarg(struct osockaddr *) name; 1756 syscallarg(int *) anamelen; 1757 } */ 1758 int error; 1759 struct sys_accept_args baa; 1760 1761 SCARG(&baa, s) = SCARG(uap, s); 1762 SCARG(&baa, name) = (struct sockaddr *) SCARG(uap, name); 1763 SCARG(&baa, anamelen) = (unsigned int *) SCARG(uap, anamelen); 1764 1765 if ((error = sys_accept(l, &baa, retval))) 1766 return (error); 1767 1768 if (SCARG(uap, name) && (error = linux_sa_put(SCARG(uap, name)))) 1769 return (error); 1770 1771 return (0); 1772 } 1773 1774 int 1775 linux_sys_accept4(struct lwp *l, const struct linux_sys_accept4_args *uap, register_t *retval) 1776 { 1777 /* { 1778 syscallarg(int) s; 1779 syscallarg(struct osockaddr *) name; 1780 syscallarg(int *) anamelen; 1781 syscallarg(int) flags; 1782 } */ 1783 int error, flags; 1784 struct sockaddr_big name; 1785 1786 if ((flags = linux_to_bsd_type(SCARG(uap, flags))) == -1) 1787 return EINVAL; 1788 1789 name.sb_len = UCHAR_MAX; 1790 error = do_sys_accept(l, SCARG(uap, s), (struct sockaddr *)&name, 1791 retval, NULL, flags, 0); 1792 if (error != 0) 1793 return error; 1794 1795 error = copyout_sockname_sb((struct sockaddr *)SCARG(uap, name), 1796 SCARG(uap, anamelen), MSG_LENUSRSPACE, &name); 1797 if (error != 0) { 1798 int fd = (int)*retval; 1799 if (fd_getfile(fd) != NULL) 1800 (void)fd_close(fd); 1801 return error; 1802 } 1803 if (SCARG(uap, name) && (error = linux_sa_put(SCARG(uap, name)))) 1804 return error; 1805 1806 return 0; 1807 } 1808 1809 int 1810 linux_sys_sendmmsg(struct lwp *l, const struct linux_sys_sendmmsg_args *uap, 1811 register_t *retval) 1812 { 1813 /* { 1814 syscallarg(int) s; 1815 syscallarg(struct linux_mmsghdr *) msgvec; 1816 syscallarg(unsigned int) vlen; 1817 syscallarg(unsigned int) flags; 1818 } */ 1819 struct linux_mmsghdr lmsg; 1820 struct mmsghdr bmsg; 1821 struct socket *so; 1822 file_t *fp; 1823 struct msghdr *msg = &bmsg.msg_hdr; 1824 int error, s; 1825 unsigned int vlen, flags, dg; 1826 1827 if ((flags = linux_to_bsd_msg_flags(SCARG(uap, flags))) == -1) 1828 return EINVAL; 1829 1830 flags = (flags & MSG_USERFLAGS) | MSG_IOVUSRSPACE; 1831 1832 s = SCARG(uap, s); 1833 if ((error = fd_getsock1(s, &so, &fp)) != 0) 1834 return error; 1835 1836 vlen = SCARG(uap, vlen); 1837 if (vlen > 1024) 1838 vlen = 1024; 1839 1840 for (dg = 0; dg < vlen;) { 1841 error = copyin(SCARG(uap, msgvec) + dg, &lmsg, sizeof(lmsg)); 1842 if (error) 1843 break; 1844 linux_to_bsd_msghdr(&lmsg.msg_hdr, &bmsg.msg_hdr); 1845 1846 msg->msg_flags = flags; 1847 1848 error = do_sys_sendmsg_so(l, s, so, fp, msg, flags, retval); 1849 if (error) 1850 break; 1851 1852 ktrkuser("msghdr", msg, sizeof *msg); 1853 lmsg.msg_len = *retval; 1854 error = copyout(&lmsg, SCARG(uap, msgvec) + dg, sizeof(lmsg)); 1855 if (error) 1856 break; 1857 dg++; 1858 1859 } 1860 1861 *retval = dg; 1862 1863 fd_putfile(s); 1864 1865 /* 1866 * If we succeeded at least once, return 0. 1867 */ 1868 if (dg) 1869 return 0; 1870 return error; 1871 } 1872 1873 int 1874 linux_sys_recvmmsg(struct lwp *l, const struct linux_sys_recvmmsg_args *uap, 1875 register_t *retval) 1876 { 1877 /* { 1878 syscallarg(int) s; 1879 syscallarg(struct linux_mmsghdr *) msgvec; 1880 syscallarg(unsigned int) vlen; 1881 syscallarg(unsigned int) flags; 1882 syscallarg(struct linux_timespec *) timeout; 1883 } */ 1884 struct linux_mmsghdr lmsg; 1885 struct mmsghdr bmsg; 1886 struct socket *so; 1887 struct msghdr *msg = &bmsg.msg_hdr; 1888 int error, s; 1889 struct mbuf *from, *control; 1890 struct timespec ts = {0}, now; 1891 struct linux_timespec lts; 1892 unsigned int vlen, flags, dg; 1893 1894 if (SCARG(uap, timeout)) { 1895 error = copyin(SCARG(uap, timeout), <s, sizeof(lts)); 1896 return error; 1897 ts.tv_sec = lts.tv_sec; 1898 ts.tv_nsec = lts.tv_nsec; 1899 getnanotime(&now); 1900 timespecadd(&now, &ts, &ts); 1901 } 1902 1903 s = SCARG(uap, s); 1904 if ((error = fd_getsock(s, &so)) != 0) 1905 return error; 1906 1907 /* 1908 * If so->so_rerror holds a deferred error return it now. 1909 */ 1910 if (so->so_rerror) { 1911 error = so->so_rerror; 1912 so->so_rerror = 0; 1913 fd_putfile(s); 1914 return error; 1915 } 1916 1917 vlen = SCARG(uap, vlen); 1918 if (vlen > 1024) 1919 vlen = 1024; 1920 1921 from = NULL; 1922 flags = (SCARG(uap, flags) & MSG_USERFLAGS) | MSG_IOVUSRSPACE; 1923 1924 for (dg = 0; dg < vlen;) { 1925 error = copyin(SCARG(uap, msgvec) + dg, &lmsg, sizeof(lmsg)); 1926 if (error) 1927 break; 1928 linux_to_bsd_msghdr(&lmsg.msg_hdr, &bmsg.msg_hdr); 1929 msg->msg_flags = flags & ~MSG_WAITFORONE; 1930 1931 if (from != NULL) { 1932 m_free(from); 1933 from = NULL; 1934 } 1935 1936 error = do_sys_recvmsg_so(l, s, so, msg, &from, 1937 msg->msg_control != NULL ? &control : NULL, retval); 1938 if (error) { 1939 if (error == EAGAIN && dg > 0) 1940 error = 0; 1941 break; 1942 } 1943 1944 if (msg->msg_control != NULL) 1945 error = linux_copyout_msg_control(l, msg, control); 1946 if (error) 1947 break; 1948 1949 if (from != NULL) { 1950 mtod(from, struct osockaddr *)->sa_family = 1951 bsd_to_linux_domain(mtod(from, 1952 struct sockaddr *)->sa_family); 1953 error = copyout_sockname(msg->msg_name, 1954 &msg->msg_namelen, 0, from); 1955 if (error) 1956 break; 1957 } 1958 1959 1960 lmsg.msg_len = *retval; 1961 ktrkuser("msghdr", msg, sizeof(*msg)); 1962 bsd_to_linux_msghdr(msg, &lmsg.msg_hdr); 1963 error = copyout(&lmsg, SCARG(uap, msgvec) + dg, sizeof(lmsg)); 1964 if (error) 1965 break; 1966 1967 dg++; 1968 if (msg->msg_flags & MSG_OOB) 1969 break; 1970 1971 if (SCARG(uap, timeout)) { 1972 getnanotime(&now); 1973 timespecsub(&now, &ts, &now); 1974 if (now.tv_sec > 0) 1975 break; 1976 } 1977 1978 if (flags & MSG_WAITFORONE) 1979 flags |= MSG_DONTWAIT; 1980 1981 } 1982 1983 if (from != NULL) 1984 m_free(from); 1985 1986 *retval = dg; 1987 1988 /* 1989 * If we succeeded at least once, return 0, hopefully so->so_rerror 1990 * will catch it next time. 1991 */ 1992 if (error && dg > 0) { 1993 so->so_rerror = error; 1994 error = 0; 1995 } 1996 1997 fd_putfile(s); 1998 1999 return error; 2000 } 2001