1 /* 2 * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c. 3 * 4 * Copyright (C) 2000 VA Linux Co 5 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> 6 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> 7 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 2000 Hewlett-Packard Co. 10 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com> 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/fs.h> 16 #include <linux/types.h> 17 #include <linux/file.h> 18 #include <linux/icmpv6.h> 19 #include <linux/socket.h> 20 #include <linux/syscalls.h> 21 #include <linux/filter.h> 22 #include <linux/compat.h> 23 #include <linux/security.h> 24 25 #include <net/scm.h> 26 #include <net/sock.h> 27 #include <asm/uaccess.h> 28 #include <net/compat.h> 29 30 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 31 struct compat_iovec __user *uiov32, 32 int niov) 33 { 34 int tot_len = 0; 35 36 while (niov > 0) { 37 compat_uptr_t buf; 38 compat_size_t len; 39 40 if (get_user(len, &uiov32->iov_len) || 41 get_user(buf, &uiov32->iov_base)) { 42 tot_len = -EFAULT; 43 break; 44 } 45 tot_len += len; 46 kiov->iov_base = compat_ptr(buf); 47 kiov->iov_len = (__kernel_size_t) len; 48 uiov32++; 49 kiov++; 50 niov--; 51 } 52 return tot_len; 53 } 54 55 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 56 { 57 compat_uptr_t tmp1, tmp2, tmp3; 58 59 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 60 __get_user(tmp1, &umsg->msg_name) || 61 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 62 __get_user(tmp2, &umsg->msg_iov) || 63 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 64 __get_user(tmp3, &umsg->msg_control) || 65 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 66 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 67 return -EFAULT; 68 kmsg->msg_name = compat_ptr(tmp1); 69 kmsg->msg_iov = compat_ptr(tmp2); 70 kmsg->msg_control = compat_ptr(tmp3); 71 return 0; 72 } 73 74 /* I've named the args so it is easy to tell whose space the pointers are in. */ 75 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 76 char *kern_address, int mode) 77 { 78 int tot_len; 79 80 if (kern_msg->msg_namelen) { 81 if (mode==VERIFY_READ) { 82 int err = move_addr_to_kernel(kern_msg->msg_name, 83 kern_msg->msg_namelen, 84 kern_address); 85 if (err < 0) 86 return err; 87 } 88 kern_msg->msg_name = kern_address; 89 } else 90 kern_msg->msg_name = NULL; 91 92 tot_len = iov_from_user_compat_to_kern(kern_iov, 93 (struct compat_iovec __user *)kern_msg->msg_iov, 94 kern_msg->msg_iovlen); 95 if (tot_len >= 0) 96 kern_msg->msg_iov = kern_iov; 97 98 return tot_len; 99 } 100 101 /* Bleech... */ 102 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 103 104 #define CMSG_COMPAT_DATA(cmsg) \ 105 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 106 #define CMSG_COMPAT_SPACE(len) \ 107 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 108 #define CMSG_COMPAT_LEN(len) \ 109 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 110 111 #define CMSG_COMPAT_FIRSTHDR(msg) \ 112 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 113 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 114 (struct compat_cmsghdr __user *)NULL) 115 116 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 117 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 118 (ucmlen) <= (unsigned long) \ 119 ((mhdr)->msg_controllen - \ 120 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 121 122 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 123 struct compat_cmsghdr __user *cmsg, int cmsg_len) 124 { 125 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 126 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 127 msg->msg_controllen) 128 return NULL; 129 return (struct compat_cmsghdr __user *)ptr; 130 } 131 132 /* There is a lot of hair here because the alignment rules (and 133 * thus placement) of cmsg headers and length are different for 134 * 32-bit apps. -DaveM 135 */ 136 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 137 unsigned char *stackbuf, int stackbuf_size) 138 { 139 struct compat_cmsghdr __user *ucmsg; 140 struct cmsghdr *kcmsg, *kcmsg_base; 141 compat_size_t ucmlen; 142 __kernel_size_t kcmlen, tmp; 143 int err = -EFAULT; 144 145 kcmlen = 0; 146 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 147 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 148 while (ucmsg != NULL) { 149 if (get_user(ucmlen, &ucmsg->cmsg_len)) 150 return -EFAULT; 151 152 /* Catch bogons. */ 153 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 154 return -EINVAL; 155 156 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 157 CMSG_ALIGN(sizeof(struct cmsghdr))); 158 tmp = CMSG_ALIGN(tmp); 159 kcmlen += tmp; 160 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 161 } 162 if (kcmlen == 0) 163 return -EINVAL; 164 165 /* The kcmlen holds the 64-bit version of the control length. 166 * It may not be modified as we do not stick it into the kmsg 167 * until we have successfully copied over all of the data 168 * from the user. 169 */ 170 if (kcmlen > stackbuf_size) 171 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 172 if (kcmsg == NULL) 173 return -ENOBUFS; 174 175 /* Now copy them over neatly. */ 176 memset(kcmsg, 0, kcmlen); 177 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 178 while (ucmsg != NULL) { 179 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 180 goto Efault; 181 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 182 goto Einval; 183 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 184 CMSG_ALIGN(sizeof(struct cmsghdr))); 185 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 186 goto Einval; 187 kcmsg->cmsg_len = tmp; 188 tmp = CMSG_ALIGN(tmp); 189 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 190 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 191 copy_from_user(CMSG_DATA(kcmsg), 192 CMSG_COMPAT_DATA(ucmsg), 193 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 194 goto Efault; 195 196 /* Advance. */ 197 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 198 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 199 } 200 201 /* Ok, looks like we made it. Hook it up and return success. */ 202 kmsg->msg_control = kcmsg_base; 203 kmsg->msg_controllen = kcmlen; 204 return 0; 205 206 Einval: 207 err = -EINVAL; 208 Efault: 209 if (kcmsg_base != (struct cmsghdr *)stackbuf) 210 sock_kfree_s(sk, kcmsg_base, kcmlen); 211 return err; 212 } 213 214 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 215 { 216 struct compat_timeval ctv; 217 struct compat_timespec cts; 218 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 219 struct compat_cmsghdr cmhdr; 220 int cmlen; 221 222 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 223 kmsg->msg_flags |= MSG_CTRUNC; 224 return 0; /* XXX: return error? check spec. */ 225 } 226 227 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 228 struct timeval *tv = (struct timeval *)data; 229 ctv.tv_sec = tv->tv_sec; 230 ctv.tv_usec = tv->tv_usec; 231 data = &ctv; 232 len = sizeof(ctv); 233 } 234 if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) { 235 struct timespec *ts = (struct timespec *)data; 236 cts.tv_sec = ts->tv_sec; 237 cts.tv_nsec = ts->tv_nsec; 238 data = &cts; 239 len = sizeof(cts); 240 } 241 242 cmlen = CMSG_COMPAT_LEN(len); 243 if (kmsg->msg_controllen < cmlen) { 244 kmsg->msg_flags |= MSG_CTRUNC; 245 cmlen = kmsg->msg_controllen; 246 } 247 cmhdr.cmsg_level = level; 248 cmhdr.cmsg_type = type; 249 cmhdr.cmsg_len = cmlen; 250 251 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 252 return -EFAULT; 253 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 254 return -EFAULT; 255 cmlen = CMSG_COMPAT_SPACE(len); 256 if (kmsg->msg_controllen < cmlen) 257 cmlen = kmsg->msg_controllen; 258 kmsg->msg_control += cmlen; 259 kmsg->msg_controllen -= cmlen; 260 return 0; 261 } 262 263 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 264 { 265 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 266 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 267 int fdnum = scm->fp->count; 268 struct file **fp = scm->fp->fp; 269 int __user *cmfptr; 270 int err = 0, i; 271 272 if (fdnum < fdmax) 273 fdmax = fdnum; 274 275 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 276 int new_fd; 277 err = security_file_receive(fp[i]); 278 if (err) 279 break; 280 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 281 ? O_CLOEXEC : 0); 282 if (err < 0) 283 break; 284 new_fd = err; 285 err = put_user(new_fd, cmfptr); 286 if (err) { 287 put_unused_fd(new_fd); 288 break; 289 } 290 /* Bump the usage count and install the file. */ 291 get_file(fp[i]); 292 fd_install(new_fd, fp[i]); 293 } 294 295 if (i > 0) { 296 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 297 err = put_user(SOL_SOCKET, &cm->cmsg_level); 298 if (!err) 299 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 300 if (!err) 301 err = put_user(cmlen, &cm->cmsg_len); 302 if (!err) { 303 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 304 kmsg->msg_control += cmlen; 305 kmsg->msg_controllen -= cmlen; 306 } 307 } 308 if (i < fdnum) 309 kmsg->msg_flags |= MSG_CTRUNC; 310 311 /* 312 * All of the files that fit in the message have had their 313 * usage counts incremented, so we just free the list. 314 */ 315 __scm_destroy(scm); 316 } 317 318 /* 319 * A struct sock_filter is architecture independent. 320 */ 321 struct compat_sock_fprog { 322 u16 len; 323 compat_uptr_t filter; /* struct sock_filter * */ 324 }; 325 326 static int do_set_attach_filter(struct socket *sock, int level, int optname, 327 char __user *optval, int optlen) 328 { 329 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 330 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 331 compat_uptr_t ptr; 332 u16 len; 333 334 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 335 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 336 __get_user(len, &fprog32->len) || 337 __get_user(ptr, &fprog32->filter) || 338 __put_user(len, &kfprog->len) || 339 __put_user(compat_ptr(ptr), &kfprog->filter)) 340 return -EFAULT; 341 342 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 343 sizeof(struct sock_fprog)); 344 } 345 346 static int do_set_sock_timeout(struct socket *sock, int level, 347 int optname, char __user *optval, int optlen) 348 { 349 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 350 struct timeval ktime; 351 mm_segment_t old_fs; 352 int err; 353 354 if (optlen < sizeof(*up)) 355 return -EINVAL; 356 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 357 __get_user(ktime.tv_sec, &up->tv_sec) || 358 __get_user(ktime.tv_usec, &up->tv_usec)) 359 return -EFAULT; 360 old_fs = get_fs(); 361 set_fs(KERNEL_DS); 362 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime)); 363 set_fs(old_fs); 364 365 return err; 366 } 367 368 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 369 char __user *optval, int optlen) 370 { 371 if (optname == SO_ATTACH_FILTER) 372 return do_set_attach_filter(sock, level, optname, 373 optval, optlen); 374 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 375 return do_set_sock_timeout(sock, level, optname, optval, optlen); 376 377 return sock_setsockopt(sock, level, optname, optval, optlen); 378 } 379 380 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 381 char __user *optval, int optlen) 382 { 383 int err; 384 struct socket *sock; 385 386 if (optlen < 0) 387 return -EINVAL; 388 389 if ((sock = sockfd_lookup(fd, &err))!=NULL) 390 { 391 err = security_socket_setsockopt(sock,level,optname); 392 if (err) { 393 sockfd_put(sock); 394 return err; 395 } 396 397 if (level == SOL_SOCKET) 398 err = compat_sock_setsockopt(sock, level, 399 optname, optval, optlen); 400 else if (sock->ops->compat_setsockopt) 401 err = sock->ops->compat_setsockopt(sock, level, 402 optname, optval, optlen); 403 else 404 err = sock->ops->setsockopt(sock, level, 405 optname, optval, optlen); 406 sockfd_put(sock); 407 } 408 return err; 409 } 410 411 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 412 char __user *optval, int __user *optlen) 413 { 414 struct compat_timeval __user *up; 415 struct timeval ktime; 416 mm_segment_t old_fs; 417 int len, err; 418 419 up = (struct compat_timeval __user *) optval; 420 if (get_user(len, optlen)) 421 return -EFAULT; 422 if (len < sizeof(*up)) 423 return -EINVAL; 424 len = sizeof(ktime); 425 old_fs = get_fs(); 426 set_fs(KERNEL_DS); 427 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 428 set_fs(old_fs); 429 430 if (!err) { 431 if (put_user(sizeof(*up), optlen) || 432 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 433 __put_user(ktime.tv_sec, &up->tv_sec) || 434 __put_user(ktime.tv_usec, &up->tv_usec)) 435 err = -EFAULT; 436 } 437 return err; 438 } 439 440 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 441 char __user *optval, int __user *optlen) 442 { 443 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 444 return do_get_sock_timeout(sock, level, optname, optval, optlen); 445 return sock_getsockopt(sock, level, optname, optval, optlen); 446 } 447 448 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 449 { 450 struct compat_timeval __user *ctv = 451 (struct compat_timeval __user*) userstamp; 452 int err = -ENOENT; 453 struct timeval tv; 454 455 if (!sock_flag(sk, SOCK_TIMESTAMP)) 456 sock_enable_timestamp(sk); 457 tv = ktime_to_timeval(sk->sk_stamp); 458 if (tv.tv_sec == -1) 459 return err; 460 if (tv.tv_sec == 0) { 461 sk->sk_stamp = ktime_get_real(); 462 tv = ktime_to_timeval(sk->sk_stamp); 463 } 464 err = 0; 465 if (put_user(tv.tv_sec, &ctv->tv_sec) || 466 put_user(tv.tv_usec, &ctv->tv_usec)) 467 err = -EFAULT; 468 return err; 469 } 470 EXPORT_SYMBOL(compat_sock_get_timestamp); 471 472 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 473 { 474 struct compat_timespec __user *ctv = 475 (struct compat_timespec __user*) userstamp; 476 int err = -ENOENT; 477 struct timespec ts; 478 479 if (!sock_flag(sk, SOCK_TIMESTAMP)) 480 sock_enable_timestamp(sk); 481 ts = ktime_to_timespec(sk->sk_stamp); 482 if (ts.tv_sec == -1) 483 return err; 484 if (ts.tv_sec == 0) { 485 sk->sk_stamp = ktime_get_real(); 486 ts = ktime_to_timespec(sk->sk_stamp); 487 } 488 err = 0; 489 if (put_user(ts.tv_sec, &ctv->tv_sec) || 490 put_user(ts.tv_nsec, &ctv->tv_nsec)) 491 err = -EFAULT; 492 return err; 493 } 494 EXPORT_SYMBOL(compat_sock_get_timestampns); 495 496 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 497 char __user *optval, int __user *optlen) 498 { 499 int err; 500 struct socket *sock; 501 502 if ((sock = sockfd_lookup(fd, &err))!=NULL) 503 { 504 err = security_socket_getsockopt(sock, level, 505 optname); 506 if (err) { 507 sockfd_put(sock); 508 return err; 509 } 510 511 if (level == SOL_SOCKET) 512 err = compat_sock_getsockopt(sock, level, 513 optname, optval, optlen); 514 else if (sock->ops->compat_getsockopt) 515 err = sock->ops->compat_getsockopt(sock, level, 516 optname, optval, optlen); 517 else 518 err = sock->ops->getsockopt(sock, level, 519 optname, optval, optlen); 520 sockfd_put(sock); 521 } 522 return err; 523 } 524 /* Argument list sizes for compat_sys_socketcall */ 525 #define AL(x) ((x) * sizeof(u32)) 526 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 527 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 528 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 529 #undef AL 530 531 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 532 { 533 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 534 } 535 536 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 537 { 538 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 539 } 540 541 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 542 { 543 int ret; 544 u32 a[6]; 545 u32 a0, a1; 546 547 if (call < SYS_SOCKET || call > SYS_RECVMSG) 548 return -EINVAL; 549 if (copy_from_user(a, args, nas[call])) 550 return -EFAULT; 551 a0 = a[0]; 552 a1 = a[1]; 553 554 switch (call) { 555 case SYS_SOCKET: 556 ret = sys_socket(a0, a1, a[2]); 557 break; 558 case SYS_BIND: 559 ret = sys_bind(a0, compat_ptr(a1), a[2]); 560 break; 561 case SYS_CONNECT: 562 ret = sys_connect(a0, compat_ptr(a1), a[2]); 563 break; 564 case SYS_LISTEN: 565 ret = sys_listen(a0, a1); 566 break; 567 case SYS_ACCEPT: 568 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 569 break; 570 case SYS_GETSOCKNAME: 571 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 572 break; 573 case SYS_GETPEERNAME: 574 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 575 break; 576 case SYS_SOCKETPAIR: 577 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 578 break; 579 case SYS_SEND: 580 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 581 break; 582 case SYS_SENDTO: 583 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 584 break; 585 case SYS_RECV: 586 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 587 break; 588 case SYS_RECVFROM: 589 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 590 break; 591 case SYS_SHUTDOWN: 592 ret = sys_shutdown(a0,a1); 593 break; 594 case SYS_SETSOCKOPT: 595 ret = compat_sys_setsockopt(a0, a1, a[2], 596 compat_ptr(a[3]), a[4]); 597 break; 598 case SYS_GETSOCKOPT: 599 ret = compat_sys_getsockopt(a0, a1, a[2], 600 compat_ptr(a[3]), compat_ptr(a[4])); 601 break; 602 case SYS_SENDMSG: 603 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 604 break; 605 case SYS_RECVMSG: 606 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 607 break; 608 default: 609 ret = -EINVAL; 610 break; 611 } 612 return ret; 613 } 614