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/netfilter_ipv4/ip_tables.h> 24 #include <linux/security.h> 25 26 #include <net/scm.h> 27 #include <net/sock.h> 28 #include <asm/uaccess.h> 29 #include <net/compat.h> 30 31 static inline int iov_from_user_compat_to_kern(struct iovec *kiov, 32 struct compat_iovec __user *uiov32, 33 int niov) 34 { 35 int tot_len = 0; 36 37 while (niov > 0) { 38 compat_uptr_t buf; 39 compat_size_t len; 40 41 if (get_user(len, &uiov32->iov_len) || 42 get_user(buf, &uiov32->iov_base)) { 43 tot_len = -EFAULT; 44 break; 45 } 46 tot_len += len; 47 kiov->iov_base = compat_ptr(buf); 48 kiov->iov_len = (__kernel_size_t) len; 49 uiov32++; 50 kiov++; 51 niov--; 52 } 53 return tot_len; 54 } 55 56 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg) 57 { 58 compat_uptr_t tmp1, tmp2, tmp3; 59 60 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 61 __get_user(tmp1, &umsg->msg_name) || 62 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 63 __get_user(tmp2, &umsg->msg_iov) || 64 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) || 65 __get_user(tmp3, &umsg->msg_control) || 66 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 67 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 68 return -EFAULT; 69 kmsg->msg_name = compat_ptr(tmp1); 70 kmsg->msg_iov = compat_ptr(tmp2); 71 kmsg->msg_control = compat_ptr(tmp3); 72 return 0; 73 } 74 75 /* I've named the args so it is easy to tell whose space the pointers are in. */ 76 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov, 77 char *kern_address, int mode) 78 { 79 int tot_len; 80 81 if (kern_msg->msg_namelen) { 82 if (mode==VERIFY_READ) { 83 int err = move_addr_to_kernel(kern_msg->msg_name, 84 kern_msg->msg_namelen, 85 kern_address); 86 if (err < 0) 87 return err; 88 } 89 kern_msg->msg_name = kern_address; 90 } else 91 kern_msg->msg_name = NULL; 92 93 tot_len = iov_from_user_compat_to_kern(kern_iov, 94 (struct compat_iovec __user *)kern_msg->msg_iov, 95 kern_msg->msg_iovlen); 96 if (tot_len >= 0) 97 kern_msg->msg_iov = kern_iov; 98 99 return tot_len; 100 } 101 102 /* Bleech... */ 103 #define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32)) 104 105 #define CMSG_COMPAT_DATA(cmsg) \ 106 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)))) 107 #define CMSG_COMPAT_SPACE(len) \ 108 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len)) 109 #define CMSG_COMPAT_LEN(len) \ 110 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len)) 111 112 #define CMSG_COMPAT_FIRSTHDR(msg) \ 113 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \ 114 (struct compat_cmsghdr __user *)((msg)->msg_control) : \ 115 (struct compat_cmsghdr __user *)NULL) 116 117 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \ 118 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \ 119 (ucmlen) <= (unsigned long) \ 120 ((mhdr)->msg_controllen - \ 121 ((char *)(ucmsg) - (char *)(mhdr)->msg_control))) 122 123 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg, 124 struct compat_cmsghdr __user *cmsg, int cmsg_len) 125 { 126 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len); 127 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) > 128 msg->msg_controllen) 129 return NULL; 130 return (struct compat_cmsghdr __user *)ptr; 131 } 132 133 /* There is a lot of hair here because the alignment rules (and 134 * thus placement) of cmsg headers and length are different for 135 * 32-bit apps. -DaveM 136 */ 137 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk, 138 unsigned char *stackbuf, int stackbuf_size) 139 { 140 struct compat_cmsghdr __user *ucmsg; 141 struct cmsghdr *kcmsg, *kcmsg_base; 142 compat_size_t ucmlen; 143 __kernel_size_t kcmlen, tmp; 144 int err = -EFAULT; 145 146 kcmlen = 0; 147 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf; 148 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 149 while (ucmsg != NULL) { 150 if (get_user(ucmlen, &ucmsg->cmsg_len)) 151 return -EFAULT; 152 153 /* Catch bogons. */ 154 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 155 return -EINVAL; 156 157 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 158 CMSG_ALIGN(sizeof(struct cmsghdr))); 159 tmp = CMSG_ALIGN(tmp); 160 kcmlen += tmp; 161 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 162 } 163 if (kcmlen == 0) 164 return -EINVAL; 165 166 /* The kcmlen holds the 64-bit version of the control length. 167 * It may not be modified as we do not stick it into the kmsg 168 * until we have successfully copied over all of the data 169 * from the user. 170 */ 171 if (kcmlen > stackbuf_size) 172 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL); 173 if (kcmsg == NULL) 174 return -ENOBUFS; 175 176 /* Now copy them over neatly. */ 177 memset(kcmsg, 0, kcmlen); 178 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg); 179 while (ucmsg != NULL) { 180 if (__get_user(ucmlen, &ucmsg->cmsg_len)) 181 goto Efault; 182 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg)) 183 goto Einval; 184 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) + 185 CMSG_ALIGN(sizeof(struct cmsghdr))); 186 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp)) 187 goto Einval; 188 kcmsg->cmsg_len = tmp; 189 tmp = CMSG_ALIGN(tmp); 190 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) || 191 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) || 192 copy_from_user(CMSG_DATA(kcmsg), 193 CMSG_COMPAT_DATA(ucmsg), 194 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))))) 195 goto Efault; 196 197 /* Advance. */ 198 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp); 199 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen); 200 } 201 202 /* Ok, looks like we made it. Hook it up and return success. */ 203 kmsg->msg_control = kcmsg_base; 204 kmsg->msg_controllen = kcmlen; 205 return 0; 206 207 Einval: 208 err = -EINVAL; 209 Efault: 210 if (kcmsg_base != (struct cmsghdr *)stackbuf) 211 sock_kfree_s(sk, kcmsg_base, kcmlen); 212 return err; 213 } 214 215 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data) 216 { 217 struct compat_timeval ctv; 218 struct compat_timespec cts; 219 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 220 struct compat_cmsghdr cmhdr; 221 int cmlen; 222 223 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { 224 kmsg->msg_flags |= MSG_CTRUNC; 225 return 0; /* XXX: return error? check spec. */ 226 } 227 228 if (level == SOL_SOCKET && type == SO_TIMESTAMP) { 229 struct timeval *tv = (struct timeval *)data; 230 ctv.tv_sec = tv->tv_sec; 231 ctv.tv_usec = tv->tv_usec; 232 data = &ctv; 233 len = sizeof(ctv); 234 } 235 if (level == SOL_SOCKET && type == SO_TIMESTAMPNS) { 236 struct timespec *ts = (struct timespec *)data; 237 cts.tv_sec = ts->tv_sec; 238 cts.tv_nsec = ts->tv_nsec; 239 data = &cts; 240 len = sizeof(cts); 241 } 242 243 cmlen = CMSG_COMPAT_LEN(len); 244 if (kmsg->msg_controllen < cmlen) { 245 kmsg->msg_flags |= MSG_CTRUNC; 246 cmlen = kmsg->msg_controllen; 247 } 248 cmhdr.cmsg_level = level; 249 cmhdr.cmsg_type = type; 250 cmhdr.cmsg_len = cmlen; 251 252 if (copy_to_user(cm, &cmhdr, sizeof cmhdr)) 253 return -EFAULT; 254 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))) 255 return -EFAULT; 256 cmlen = CMSG_COMPAT_SPACE(len); 257 if (kmsg->msg_controllen < cmlen) 258 cmlen = kmsg->msg_controllen; 259 kmsg->msg_control += cmlen; 260 kmsg->msg_controllen -= cmlen; 261 return 0; 262 } 263 264 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm) 265 { 266 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; 267 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int); 268 int fdnum = scm->fp->count; 269 struct file **fp = scm->fp->fp; 270 int __user *cmfptr; 271 int err = 0, i; 272 273 if (fdnum < fdmax) 274 fdmax = fdnum; 275 276 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) { 277 int new_fd; 278 err = security_file_receive(fp[i]); 279 if (err) 280 break; 281 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags 282 ? O_CLOEXEC : 0); 283 if (err < 0) 284 break; 285 new_fd = err; 286 err = put_user(new_fd, cmfptr); 287 if (err) { 288 put_unused_fd(new_fd); 289 break; 290 } 291 /* Bump the usage count and install the file. */ 292 get_file(fp[i]); 293 fd_install(new_fd, fp[i]); 294 } 295 296 if (i > 0) { 297 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int)); 298 err = put_user(SOL_SOCKET, &cm->cmsg_level); 299 if (!err) 300 err = put_user(SCM_RIGHTS, &cm->cmsg_type); 301 if (!err) 302 err = put_user(cmlen, &cm->cmsg_len); 303 if (!err) { 304 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int)); 305 kmsg->msg_control += cmlen; 306 kmsg->msg_controllen -= cmlen; 307 } 308 } 309 if (i < fdnum) 310 kmsg->msg_flags |= MSG_CTRUNC; 311 312 /* 313 * All of the files that fit in the message have had their 314 * usage counts incremented, so we just free the list. 315 */ 316 __scm_destroy(scm); 317 } 318 319 /* 320 * For now, we assume that the compatibility and native version 321 * of struct ipt_entry are the same - sfr. FIXME 322 */ 323 struct compat_ipt_replace { 324 char name[IPT_TABLE_MAXNAMELEN]; 325 u32 valid_hooks; 326 u32 num_entries; 327 u32 size; 328 u32 hook_entry[NF_IP_NUMHOOKS]; 329 u32 underflow[NF_IP_NUMHOOKS]; 330 u32 num_counters; 331 compat_uptr_t counters; /* struct ipt_counters * */ 332 struct ipt_entry entries[0]; 333 }; 334 335 static int do_netfilter_replace(int fd, int level, int optname, 336 char __user *optval, int optlen) 337 { 338 struct compat_ipt_replace __user *urepl; 339 struct ipt_replace __user *repl_nat; 340 char name[IPT_TABLE_MAXNAMELEN]; 341 u32 origsize, tmp32, num_counters; 342 unsigned int repl_nat_size; 343 int ret; 344 int i; 345 compat_uptr_t ucntrs; 346 347 urepl = (struct compat_ipt_replace __user *)optval; 348 if (get_user(origsize, &urepl->size)) 349 return -EFAULT; 350 351 /* Hack: Causes ipchains to give correct error msg --RR */ 352 if (optlen != sizeof(*urepl) + origsize) 353 return -ENOPROTOOPT; 354 355 /* XXX Assumes that size of ipt_entry is the same both in 356 * native and compat environments. 357 */ 358 repl_nat_size = sizeof(*repl_nat) + origsize; 359 repl_nat = compat_alloc_user_space(repl_nat_size); 360 361 ret = -EFAULT; 362 if (put_user(origsize, &repl_nat->size)) 363 goto out; 364 365 if (!access_ok(VERIFY_READ, urepl, optlen) || 366 !access_ok(VERIFY_WRITE, repl_nat, optlen)) 367 goto out; 368 369 if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) || 370 __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name))) 371 goto out; 372 373 if (__get_user(tmp32, &urepl->valid_hooks) || 374 __put_user(tmp32, &repl_nat->valid_hooks)) 375 goto out; 376 377 if (__get_user(tmp32, &urepl->num_entries) || 378 __put_user(tmp32, &repl_nat->num_entries)) 379 goto out; 380 381 if (__get_user(num_counters, &urepl->num_counters) || 382 __put_user(num_counters, &repl_nat->num_counters)) 383 goto out; 384 385 if (__get_user(ucntrs, &urepl->counters) || 386 __put_user(compat_ptr(ucntrs), &repl_nat->counters)) 387 goto out; 388 389 if (__copy_in_user(&repl_nat->entries[0], 390 &urepl->entries[0], 391 origsize)) 392 goto out; 393 394 for (i = 0; i < NF_IP_NUMHOOKS; i++) { 395 if (__get_user(tmp32, &urepl->hook_entry[i]) || 396 __put_user(tmp32, &repl_nat->hook_entry[i]) || 397 __get_user(tmp32, &urepl->underflow[i]) || 398 __put_user(tmp32, &repl_nat->underflow[i])) 399 goto out; 400 } 401 402 /* 403 * Since struct ipt_counters just contains two u_int64_t members 404 * we can just do the access_ok check here and pass the (converted) 405 * pointer into the standard syscall. We hope that the pointer is 406 * not misaligned ... 407 */ 408 if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs), 409 num_counters * sizeof(struct ipt_counters))) 410 goto out; 411 412 413 ret = sys_setsockopt(fd, level, optname, 414 (char __user *)repl_nat, repl_nat_size); 415 416 out: 417 return ret; 418 } 419 420 /* 421 * A struct sock_filter is architecture independent. 422 */ 423 struct compat_sock_fprog { 424 u16 len; 425 compat_uptr_t filter; /* struct sock_filter * */ 426 }; 427 428 static int do_set_attach_filter(struct socket *sock, int level, int optname, 429 char __user *optval, int optlen) 430 { 431 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval; 432 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog)); 433 compat_uptr_t ptr; 434 u16 len; 435 436 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) || 437 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) || 438 __get_user(len, &fprog32->len) || 439 __get_user(ptr, &fprog32->filter) || 440 __put_user(len, &kfprog->len) || 441 __put_user(compat_ptr(ptr), &kfprog->filter)) 442 return -EFAULT; 443 444 return sock_setsockopt(sock, level, optname, (char __user *)kfprog, 445 sizeof(struct sock_fprog)); 446 } 447 448 static int do_set_sock_timeout(struct socket *sock, int level, 449 int optname, char __user *optval, int optlen) 450 { 451 struct compat_timeval __user *up = (struct compat_timeval __user *) optval; 452 struct timeval ktime; 453 mm_segment_t old_fs; 454 int err; 455 456 if (optlen < sizeof(*up)) 457 return -EINVAL; 458 if (!access_ok(VERIFY_READ, up, sizeof(*up)) || 459 __get_user(ktime.tv_sec, &up->tv_sec) || 460 __get_user(ktime.tv_usec, &up->tv_usec)) 461 return -EFAULT; 462 old_fs = get_fs(); 463 set_fs(KERNEL_DS); 464 err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime)); 465 set_fs(old_fs); 466 467 return err; 468 } 469 470 static int compat_sock_setsockopt(struct socket *sock, int level, int optname, 471 char __user *optval, int optlen) 472 { 473 if (optname == SO_ATTACH_FILTER) 474 return do_set_attach_filter(sock, level, optname, 475 optval, optlen); 476 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 477 return do_set_sock_timeout(sock, level, optname, optval, optlen); 478 479 return sock_setsockopt(sock, level, optname, optval, optlen); 480 } 481 482 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname, 483 char __user *optval, int optlen) 484 { 485 int err; 486 struct socket *sock; 487 488 if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE) 489 return do_netfilter_replace(fd, level, optname, 490 optval, optlen); 491 492 if (optlen < 0) 493 return -EINVAL; 494 495 if ((sock = sockfd_lookup(fd, &err))!=NULL) 496 { 497 err = security_socket_setsockopt(sock,level,optname); 498 if (err) { 499 sockfd_put(sock); 500 return err; 501 } 502 503 if (level == SOL_SOCKET) 504 err = compat_sock_setsockopt(sock, level, 505 optname, optval, optlen); 506 else if (sock->ops->compat_setsockopt) 507 err = sock->ops->compat_setsockopt(sock, level, 508 optname, optval, optlen); 509 else 510 err = sock->ops->setsockopt(sock, level, 511 optname, optval, optlen); 512 sockfd_put(sock); 513 } 514 return err; 515 } 516 517 static int do_get_sock_timeout(struct socket *sock, int level, int optname, 518 char __user *optval, int __user *optlen) 519 { 520 struct compat_timeval __user *up; 521 struct timeval ktime; 522 mm_segment_t old_fs; 523 int len, err; 524 525 up = (struct compat_timeval __user *) optval; 526 if (get_user(len, optlen)) 527 return -EFAULT; 528 if (len < sizeof(*up)) 529 return -EINVAL; 530 len = sizeof(ktime); 531 old_fs = get_fs(); 532 set_fs(KERNEL_DS); 533 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len); 534 set_fs(old_fs); 535 536 if (!err) { 537 if (put_user(sizeof(*up), optlen) || 538 !access_ok(VERIFY_WRITE, up, sizeof(*up)) || 539 __put_user(ktime.tv_sec, &up->tv_sec) || 540 __put_user(ktime.tv_usec, &up->tv_usec)) 541 err = -EFAULT; 542 } 543 return err; 544 } 545 546 static int compat_sock_getsockopt(struct socket *sock, int level, int optname, 547 char __user *optval, int __user *optlen) 548 { 549 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO) 550 return do_get_sock_timeout(sock, level, optname, optval, optlen); 551 return sock_getsockopt(sock, level, optname, optval, optlen); 552 } 553 554 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 555 { 556 struct compat_timeval __user *ctv = 557 (struct compat_timeval __user*) userstamp; 558 int err = -ENOENT; 559 struct timeval tv; 560 561 if (!sock_flag(sk, SOCK_TIMESTAMP)) 562 sock_enable_timestamp(sk); 563 tv = ktime_to_timeval(sk->sk_stamp); 564 if (tv.tv_sec == -1) 565 return err; 566 if (tv.tv_sec == 0) { 567 sk->sk_stamp = ktime_get_real(); 568 tv = ktime_to_timeval(sk->sk_stamp); 569 } 570 err = 0; 571 if (put_user(tv.tv_sec, &ctv->tv_sec) || 572 put_user(tv.tv_usec, &ctv->tv_usec)) 573 err = -EFAULT; 574 return err; 575 } 576 EXPORT_SYMBOL(compat_sock_get_timestamp); 577 578 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 579 { 580 struct compat_timespec __user *ctv = 581 (struct compat_timespec __user*) userstamp; 582 int err = -ENOENT; 583 struct timespec ts; 584 585 if (!sock_flag(sk, SOCK_TIMESTAMP)) 586 sock_enable_timestamp(sk); 587 ts = ktime_to_timespec(sk->sk_stamp); 588 if (ts.tv_sec == -1) 589 return err; 590 if (ts.tv_sec == 0) { 591 sk->sk_stamp = ktime_get_real(); 592 ts = ktime_to_timespec(sk->sk_stamp); 593 } 594 err = 0; 595 if (put_user(ts.tv_sec, &ctv->tv_sec) || 596 put_user(ts.tv_nsec, &ctv->tv_nsec)) 597 err = -EFAULT; 598 return err; 599 } 600 EXPORT_SYMBOL(compat_sock_get_timestampns); 601 602 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname, 603 char __user *optval, int __user *optlen) 604 { 605 int err; 606 struct socket *sock; 607 608 if ((sock = sockfd_lookup(fd, &err))!=NULL) 609 { 610 err = security_socket_getsockopt(sock, level, 611 optname); 612 if (err) { 613 sockfd_put(sock); 614 return err; 615 } 616 617 if (level == SOL_SOCKET) 618 err = compat_sock_getsockopt(sock, level, 619 optname, optval, optlen); 620 else if (sock->ops->compat_getsockopt) 621 err = sock->ops->compat_getsockopt(sock, level, 622 optname, optval, optlen); 623 else 624 err = sock->ops->getsockopt(sock, level, 625 optname, optval, optlen); 626 sockfd_put(sock); 627 } 628 return err; 629 } 630 /* Argument list sizes for compat_sys_socketcall */ 631 #define AL(x) ((x) * sizeof(u32)) 632 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 633 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 634 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)}; 635 #undef AL 636 637 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags) 638 { 639 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 640 } 641 642 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) 643 { 644 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); 645 } 646 647 asmlinkage long compat_sys_socketcall(int call, u32 __user *args) 648 { 649 int ret; 650 u32 a[6]; 651 u32 a0, a1; 652 653 if (call < SYS_SOCKET || call > SYS_RECVMSG) 654 return -EINVAL; 655 if (copy_from_user(a, args, nas[call])) 656 return -EFAULT; 657 a0 = a[0]; 658 a1 = a[1]; 659 660 switch (call) { 661 case SYS_SOCKET: 662 ret = sys_socket(a0, a1, a[2]); 663 break; 664 case SYS_BIND: 665 ret = sys_bind(a0, compat_ptr(a1), a[2]); 666 break; 667 case SYS_CONNECT: 668 ret = sys_connect(a0, compat_ptr(a1), a[2]); 669 break; 670 case SYS_LISTEN: 671 ret = sys_listen(a0, a1); 672 break; 673 case SYS_ACCEPT: 674 ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2])); 675 break; 676 case SYS_GETSOCKNAME: 677 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2])); 678 break; 679 case SYS_GETPEERNAME: 680 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2])); 681 break; 682 case SYS_SOCKETPAIR: 683 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3])); 684 break; 685 case SYS_SEND: 686 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]); 687 break; 688 case SYS_SENDTO: 689 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]); 690 break; 691 case SYS_RECV: 692 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]); 693 break; 694 case SYS_RECVFROM: 695 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5])); 696 break; 697 case SYS_SHUTDOWN: 698 ret = sys_shutdown(a0,a1); 699 break; 700 case SYS_SETSOCKOPT: 701 ret = compat_sys_setsockopt(a0, a1, a[2], 702 compat_ptr(a[3]), a[4]); 703 break; 704 case SYS_GETSOCKOPT: 705 ret = compat_sys_getsockopt(a0, a1, a[2], 706 compat_ptr(a[3]), compat_ptr(a[4])); 707 break; 708 case SYS_SENDMSG: 709 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]); 710 break; 711 case SYS_RECVMSG: 712 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]); 713 break; 714 default: 715 ret = -EINVAL; 716 break; 717 } 718 return ret; 719 } 720