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/sched.h> 17 #include <linux/types.h> 18 #include <linux/file.h> 19 #include <linux/icmpv6.h> 20 #include <linux/socket.h> 21 #include <linux/syscalls.h> 22 #include <linux/filter.h> 23 #include <linux/compat.h> 24 #include <linux/netfilter_ipv4/ip_tables.h> 25 #include <linux/security.h> 26 27 #include <net/scm.h> 28 #include <net/sock.h> 29 #include <asm/uaccess.h> 30 #include <net/compat.h> 31 32 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 33 struct compat_iovec __user *uiov32, 34 int niov) 35 { 36 int tot_len = 0; 37 38 while(niov > 0) { 39 compat_uptr_t buf; 40 compat_size_t len; 41 42 if(get_user(len, &uiov32->iov_len) || 43 get_user(buf, &uiov32->iov_base)) { 44 tot_len = -EFAULT; 45 break; 46 } 47 tot_len += len; 48 kiov->iov_base = compat_ptr(buf); 49 kiov->iov_len = (__kernel_size_t) len; 50 uiov32++; 51 kiov++; 52 niov--; 53 } 54 return tot_len; 55 } 56 57 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 58 { 59 compat_uptr_t tmp1, tmp2, tmp3; 60 61 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 62 __get_user(tmp1, &umsg->msg_name) || 63 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 64 __get_user(tmp2, &umsg->msg_iov) || 65 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 66 __get_user(tmp3, &umsg->msg_control) || 67 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 68 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 69 return -EFAULT; 70 kmsg->msg_name = compat_ptr(tmp1); 71 kmsg->msg_iov = compat_ptr(tmp2); 72 kmsg->msg_control = compat_ptr(tmp3); 73 return 0; 74 } 75 76 /* I've named the args so it is easy to tell whose space the pointers are in. */ 77 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 78 char *kern_address, int mode) 79 { 80 int tot_len; 81 82 if(kern_msg->msg_namelen) { 83 if(mode==VERIFY_READ) { 84 int err = move_addr_to_kernel(kern_msg->msg_name, 85 kern_msg->msg_namelen, 86 kern_address); 87 if(err < 0) 88 return err; 89 } 90 kern_msg->msg_name = kern_address; 91 } else 92 kern_msg->msg_name = NULL; 93 94 if(kern_msg->msg_iovlen > UIO_FASTIOV) { 95 kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec), 96 GFP_KERNEL); 97 if(!kern_iov) 98 return -ENOMEM; 99 } 100 101 tot_len = iov_from_user_compat_to_kern(kern_iov, 102 (struct compat_iovec __user *)kern_msg->msg_iov, 103 kern_msg->msg_iovlen); 104 if(tot_len >= 0) 105 kern_msg->msg_iov = kern_iov; 106 else if(kern_msg->msg_iovlen > UIO_FASTIOV) 107 kfree(kern_iov); 108 109 return tot_len; 110 } 111 112 /* Bleech... */ 113 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 114 115 #define CMSG_COMPAT_DATA(cmsg) \ 116 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 117 #define CMSG_COMPAT_SPACE(len) \ 118 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 119 #define CMSG_COMPAT_LEN(len) \ 120 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 121 122 #define CMSG_COMPAT_FIRSTHDR(msg) \ 123 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 124 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 125 (struct compat_cmsghdr __user *)NULL) 126 127 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 128 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 129 (ucmlen) <= (unsigned long) \ 130 ((mhdr)->msg_controllen - \ 131 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 132 133 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 134 struct compat_cmsghdr __user *cmsg, int cmsg_len) 135 { 136 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 137 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 138 msg->msg_controllen) 139 return NULL; 140 return (struct compat_cmsghdr __user *)ptr; 141 } 142 143 /* There is a lot of hair here because the alignment rules (and 144 * thus placement) of cmsg headers and length are different for 145 * 32-bit apps. -DaveM 146 */ 147 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, 148 unsigned char *stackbuf, int stackbuf_size) 149 { 150 struct compat_cmsghdr __user *ucmsg; 151 struct cmsghdr *kcmsg, *kcmsg_base; 152 compat_size_t ucmlen; 153 __kernel_size_t kcmlen, tmp; 154 155 kcmlen = 0; 156 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 157 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 158 while(ucmsg != NULL) { 159 if(get_user(ucmlen, &ucmsg->cmsg_len)) 160 return -EFAULT; 161 162 /* Catch bogons. */ 163 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 164 return -EINVAL; 165 166 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 167 CMSG_ALIGN(sizeof(struct cmsghdr))); 168 kcmlen += tmp; 169 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 170 } 171 if(kcmlen == 0) 172 return -EINVAL; 173 174 /* The kcmlen holds the 64-bit version of the control length. 175 * It may not be modified as we do not stick it into the kmsg 176 * until we have successfully copied over all of the data 177 * from the user. 178 */ 179 if(kcmlen > stackbuf_size) 180 kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL); 181 if(kcmsg == NULL) 182 return -ENOBUFS; 183 184 /* Now copy them over neatly. */ 185 memset(kcmsg, 0, kcmlen); 186 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 187 while(ucmsg != NULL) { 188 __get_user(ucmlen, &ucmsg->cmsg_len); 189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 190 CMSG_ALIGN(sizeof(struct cmsghdr))); 191 kcmsg->cmsg_len = tmp; 192 __get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level); 193 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type); 194 195 /* Copy over the data. */ 196 if(copy_from_user(CMSG_DATA(kcmsg), 197 CMSG_COMPAT_DATA(ucmsg), 198 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 199 goto out_free_efault; 200 201 /* Advance. */ 202 kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp)); 203 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 204 } 205 206 /* Ok, looks like we made it. Hook it up and return success. */ 207 kmsg->msg_control = kcmsg_base; 208 kmsg->msg_controllen = kcmlen; 209 return 0; 210 211 out_free_efault: 212 if(kcmsg_base != (struct cmsghdr *)stackbuf) 213 kfree(kcmsg_base); 214 return -EFAULT; 215 } 216 217 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 218 { 219 struct compat_timeval ctv; 220 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 221 struct compat_cmsghdr cmhdr; 222 int cmlen; 223 224 if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 225 kmsg->msg_flags |= MSG_CTRUNC; 226 return 0; /* XXX: return error? check spec. */ 227 } 228 229 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 230 struct timeval *tv = (struct timeval *)data; 231 ctv.tv_sec = tv->tv_sec; 232 ctv.tv_usec = tv->tv_usec; 233 data = &ctv; 234 len = sizeof(struct compat_timeval); 235 } 236 237 cmlen = CMSG_COMPAT_LEN(len); 238 if(kmsg->msg_controllen < cmlen) { 239 kmsg->msg_flags |= MSG_CTRUNC; 240 cmlen = kmsg->msg_controllen; 241 } 242 cmhdr.cmsg_level = level; 243 cmhdr.cmsg_type = type; 244 cmhdr.cmsg_len = cmlen; 245 246 if(copy_to_user(cm, &cmhdr, sizeof cmhdr)) 247 return -EFAULT; 248 if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 249 return -EFAULT; 250 cmlen = CMSG_COMPAT_SPACE(len); 251 kmsg->msg_control += cmlen; 252 kmsg->msg_controllen -= cmlen; 253 return 0; 254 } 255 256 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 257 { 258 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 259 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 260 int fdnum = scm->fp->count; 261 struct file **fp = scm->fp->fp; 262 int __user *cmfptr; 263 int err = 0, i; 264 265 if (fdnum < fdmax) 266 fdmax = fdnum; 267 268 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 269 int new_fd; 270 err = security_file_receive(fp[i]); 271 if (err) 272 break; 273 err = get_unused_fd(); 274 if (err < 0) 275 break; 276 new_fd = err; 277 err = put_user(new_fd, cmfptr); 278 if (err) { 279 put_unused_fd(new_fd); 280 break; 281 } 282 /* Bump the usage count and install the file. */ 283 get_file(fp[i]); 284 fd_install(new_fd, fp[i]); 285 } 286 287 if (i > 0) { 288 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 289 if (!err) 290 err = put_user(SOL_SOCKET, &cm->cmsg_level); 291 if (!err) 292 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 293 if (!err) 294 err = put_user(cmlen, &cm->cmsg_len); 295 if (!err) { 296 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 297 kmsg->msg_control += cmlen; 298 kmsg->msg_controllen -= cmlen; 299 } 300 } 301 if (i < fdnum) 302 kmsg->msg_flags |= MSG_CTRUNC; 303 304 /* 305 * All of the files that fit in the message have had their 306 * usage counts incremented, so we just free the list. 307 */ 308 __scm_destroy(scm); 309 } 310 311 /* 312 * For now, we assume that the compatibility and native version 313 * of struct ipt_entry are the same - sfr. FIXME 314 */ 315 struct compat_ipt_replace { 316 char name[IPT_TABLE_MAXNAMELEN]; 317 u32 valid_hooks; 318 u32 num_entries; 319 u32 size; 320 u32 hook_entry[NF_IP_NUMHOOKS]; 321 u32 underflow[NF_IP_NUMHOOKS]; 322 u32 num_counters; 323 compat_uptr_t counters; /* struct ipt_counters * */ 324 struct ipt_entry entries[0]; 325 }; 326 327 static int do_netfilter_replace(int fd, int level, int optname, 328 char __user *optval, int optlen) 329 { 330 struct compat_ipt_replace __user *urepl; 331 struct ipt_replace __user *repl_nat; 332 char name[IPT_TABLE_MAXNAMELEN]; 333 u32 origsize, tmp32, num_counters; 334 unsigned int repl_nat_size; 335 int ret; 336 int i; 337 compat_uptr_t ucntrs; 338 339 urepl = (struct compat_ipt_replace __user *)optval; 340 if (get_user(origsize, &urepl->size)) 341 return -EFAULT; 342 343 /* Hack: Causes ipchains to give correct error msg --RR */ 344 if (optlen != sizeof(*urepl) + origsize) 345 return -ENOPROTOOPT; 346 347 /* XXX Assumes that size of ipt_entry is the same both in 348 * native and compat environments. 349 */ 350 repl_nat_size = sizeof(*repl_nat) + origsize; 351 repl_nat = compat_alloc_user_space(repl_nat_size); 352 353 ret = -EFAULT; 354 if (put_user(origsize, &repl_nat->size)) 355 goto out; 356 357 if (!access_ok(VERIFY_READ, urepl, optlen) || 358 !access_ok(VERIFY_WRITE, repl_nat, optlen)) 359 goto out; 360 361 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) || 362 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name))) 363 goto out; 364 365 if (__get_user(tmp32, &urepl->valid_hooks) || 366 __put_user(tmp32, &repl_nat->valid_hooks)) 367 goto out; 368 369 if (__get_user(tmp32, &urepl->num_entries) || 370 __put_user(tmp32, &repl_nat->num_entries)) 371 goto out; 372 373 if (__get_user(num_counters, &urepl->num_counters) || 374 __put_user(num_counters, &repl_nat->num_counters)) 375 goto out; 376 377 if (__get_user(ucntrs, &urepl->counters) || 378 __put_user(compat_ptr(ucntrs), &repl_nat->counters)) 379 goto out; 380 381 if (__copy_in_user(&repl_nat->entries[0], 382 &urepl->entries[0], 383 origsize)) 384 goto out; 385 386 for (i = 0; i < NF_IP_NUMHOOKS; i++) { 387 if (__get_user(tmp32, &urepl->hook_entry[i]) || 388 __put_user(tmp32, &repl_nat->hook_entry[i]) || 389 __get_user(tmp32, &urepl->underflow[i]) || 390 __put_user(tmp32, &repl_nat->underflow[i])) 391 goto out; 392 } 393 394 /* 395 * Since struct ipt_counters just contains two u_int64_t members 396 * we can just do the access_ok check here and pass the (converted) 397 * pointer into the standard syscall. We hope that the pointer is 398 * not misaligned ... 399 */ 400 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs), 401 num_counters * sizeof(struct ipt_counters))) 402 goto out; 403 404 405 ret = sys_setsockopt(fd, level, optname, 406 (char __user *)repl_nat, repl_nat_size); 407 408 out: 409 return ret; 410 } 411 412 /* 413 * A struct sock_filter is architecture independent. 414 */ 415 struct compat_sock_fprog { 416 u16 len; 417 compat_uptr_t filter; /* struct sock_filter * */ 418 }; 419 420 static int do_set_attach_filter(int fd, int level, int optname, 421 char __user *optval, int optlen) 422 { 423 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 424 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 425 compat_uptr_t ptr; 426 u16 len; 427 428 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 429 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 430 __get_user(len, &fprog32->len) || 431 __get_user(ptr, &fprog32->filter) || 432 __put_user(len, &kfprog->len) || 433 __put_user(compat_ptr(ptr), &kfprog->filter)) 434 return -EFAULT; 435 436 return sys_setsockopt(fd, level, optname, (char __user *)kfprog, 437 sizeof(struct sock_fprog)); 438 } 439 440 static int do_set_sock_timeout(int fd, int level, int optname, char __user *optval, int optlen) 441 { 442 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 443 struct timeval ktime; 444 mm_segment_t old_fs; 445 int err; 446 447 if (optlen < sizeof(*up)) 448 return -EINVAL; 449 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 450 __get_user(ktime.tv_sec, &up->tv_sec) || 451 __get_user(ktime.tv_usec, &up->tv_usec)) 452 return -EFAULT; 453 old_fs = get_fs(); 454 set_fs(KERNEL_DS); 455 err = sys_setsockopt(fd, level, optname, (char *) &ktime, sizeof(ktime)); 456 set_fs(old_fs); 457 458 return err; 459 } 460 461 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 462 char __user *optval, int optlen) 463 { 464 /* SO_SET_REPLACE seems to be the same in all levels */ 465 if (optname == IPT_SO_SET_REPLACE) 466 return do_netfilter_replace(fd, level, optname, 467 optval, optlen); 468 if (level == SOL_SOCKET && optname == SO_ATTACH_FILTER) 469 return do_set_attach_filter(fd, level, optname, 470 optval, optlen); 471 if (level == SOL_SOCKET && 472 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 473 return do_set_sock_timeout(fd, level, optname, optval, optlen); 474 475 return sys_setsockopt(fd, level, optname, optval, optlen); 476 } 477 478 static int do_get_sock_timeout(int fd, int level, int optname, 479 char __user *optval, int __user *optlen) 480 { 481 struct compat_timeval __user *up; 482 struct timeval ktime; 483 mm_segment_t old_fs; 484 int len, err; 485 486 up = (struct compat_timeval __user *) optval; 487 if (get_user(len, optlen)) 488 return -EFAULT; 489 if (len < sizeof(*up)) 490 return -EINVAL; 491 len = sizeof(ktime); 492 old_fs = get_fs(); 493 set_fs(KERNEL_DS); 494 err = sys_getsockopt(fd, level, optname, (char *) &ktime, &len); 495 set_fs(old_fs); 496 497 if (!err) { 498 if (put_user(sizeof(*up), optlen) || 499 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 500 __put_user(ktime.tv_sec, &up->tv_sec) || 501 __put_user(ktime.tv_usec, &up->tv_usec)) 502 err = -EFAULT; 503 } 504 return err; 505 } 506 507 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 508 char __user *optval, int __user *optlen) 509 { 510 if (level == SOL_SOCKET && 511 (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)) 512 return do_get_sock_timeout(fd, level, optname, optval, optlen); 513 return sys_getsockopt(fd, level, optname, optval, optlen); 514 } 515 516 /* Argument list sizes for compat_sys_socketcall */ 517 #define AL(x) ((x) * sizeof(u32)) 518 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 519 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 520 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 521 #undef AL 522 523 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 524 { 525 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 526 } 527 528 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 529 { 530 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 531 } 532 533 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 534 { 535 int ret; 536 u32 a[6]; 537 u32 a0, a1; 538 539 if (call < SYS_SOCKET || call > SYS_RECVMSG) 540 return -EINVAL; 541 if (copy_from_user(a, args, nas[call])) 542 return -EFAULT; 543 a0 = a[0]; 544 a1 = a[1]; 545 546 switch(call) { 547 case SYS_SOCKET: 548 ret = sys_socket(a0, a1, a[2]); 549 break; 550 case SYS_BIND: 551 ret = sys_bind(a0, compat_ptr(a1), a[2]); 552 break; 553 case SYS_CONNECT: 554 ret = sys_connect(a0, compat_ptr(a1), a[2]); 555 break; 556 case SYS_LISTEN: 557 ret = sys_listen(a0, a1); 558 break; 559 case SYS_ACCEPT: 560 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 561 break; 562 case SYS_GETSOCKNAME: 563 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 564 break; 565 case SYS_GETPEERNAME: 566 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 567 break; 568 case SYS_SOCKETPAIR: 569 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 570 break; 571 case SYS_SEND: 572 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 573 break; 574 case SYS_SENDTO: 575 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 576 break; 577 case SYS_RECV: 578 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 579 break; 580 case SYS_RECVFROM: 581 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 582 break; 583 case SYS_SHUTDOWN: 584 ret = sys_shutdown(a0,a1); 585 break; 586 case SYS_SETSOCKOPT: 587 ret = compat_sys_setsockopt(a0, a1, a[2], 588 compat_ptr(a[3]), a[4]); 589 break; 590 case SYS_GETSOCKOPT: 591 ret = compat_sys_getsockopt(a0, a1, a[2], 592 compat_ptr(a[3]), compat_ptr(a[4])); 593 break; 594 case SYS_SENDMSG: 595 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 596 break; 597 case SYS_RECVMSG: 598 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 599 break; 600 default: 601 ret = -EINVAL; 602 break; 603 } 604 return ret; 605 } 606