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Merge tag 'fbdev-fixes-3.9-rc4' of git://gitorious.org/linux-omap-dss2/linux
[linux.git] / net / compat.c
CommitLineData
4768fbcb 1/*
1da177e4
LT		 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 <[email protected]>
6 * Copyright (C) 1999 Arun Sharma <[email protected]>
7 * Copyright (C) 1997,1998 Jakub Jelinek ([email protected])
8 * Copyright (C) 1997 David S. Miller ([email protected])
9 * Copyright (C) 2000 Hewlett-Packard Co.
10 * Copyright (C) 2000 David Mosberger-Tang <[email protected]>
4768fbcb 11 * Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
1da177e4
LT		 12 */
13
14#include <linux/kernel.h>
5a0e3ad6 15#include <linux/gfp.h>
1da177e4 16#include <linux/fs.h>
1da177e4
LT		 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>
1da177e4 24#include <linux/security.h>
bc3b2d7f 25#include <linux/export.h>
1da177e4
LT		 26
27#include <net/scm.h>
28#include <net/sock.h>
dae50295
DS		 29#include <net/ip.h>
30#include <net/ipv6.h>
1da177e4
LT		 31#include <asm/uaccess.h>
32#include <net/compat.h>
33
34static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
35 struct compat_iovec __user *uiov32,
36 int niov)
37{
38 int tot_len = 0;
39
e71a4783 40 while (niov > 0) {
1da177e4
LT		 41 compat_uptr_t buf;
42 compat_size_t len;
43
e71a4783 44 if (get_user(len, &uiov32->iov_len) ||
8acfe468
DM		 45 get_user(buf, &uiov32->iov_base))
46 return -EFAULT;
47
48 if (len > INT_MAX - tot_len)
49 len = INT_MAX - tot_len;
50
1da177e4
LT		 51 tot_len += len;
52 kiov->iov_base = compat_ptr(buf);
53 kiov->iov_len = (__kernel_size_t) len;
54 uiov32++;
55 kiov++;
56 niov--;
57 }
58 return tot_len;
59}
60
61int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
62{
63 compat_uptr_t tmp1, tmp2, tmp3;
64
65 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
66 __get_user(tmp1, &umsg->msg_name) ||
67 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
68 __get_user(tmp2, &umsg->msg_iov) ||
69 __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
70 __get_user(tmp3, &umsg->msg_control) ||
71 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
72 __get_user(kmsg->msg_flags, &umsg->msg_flags))
73 return -EFAULT;
74 kmsg->msg_name = compat_ptr(tmp1);
75 kmsg->msg_iov = compat_ptr(tmp2);
76 kmsg->msg_control = compat_ptr(tmp3);
77 return 0;
78}
79
80/* I've named the args so it is easy to tell whose space the pointers are in. */
81int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
43db362d 82 struct sockaddr_storage *kern_address, int mode)
1da177e4
LT		 83{
84 int tot_len;
85
e71a4783 86 if (kern_msg->msg_namelen) {
c6d409cf 87 if (mode == VERIFY_READ) {
1da177e4
LT		 88 int err = move_addr_to_kernel(kern_msg->msg_name,
89 kern_msg->msg_namelen,
90 kern_address);
e71a4783 91 if (err < 0)
1da177e4
LT		 92 return err;
93 }
94 kern_msg->msg_name = kern_address;
95 } else
96 kern_msg->msg_name = NULL;
97
1da177e4
LT		 98 tot_len = iov_from_user_compat_to_kern(kern_iov,
99 (struct compat_iovec __user *)kern_msg->msg_iov,
100 kern_msg->msg_iovlen);
e71a4783 101 if (tot_len >= 0)
1da177e4 102 kern_msg->msg_iov = kern_iov;
1da177e4
LT		 103
104 return tot_len;
105}
106
107/* Bleech... */
108#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
109
110#define CMSG_COMPAT_DATA(cmsg) \
111 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
112#define CMSG_COMPAT_SPACE(len) \
113 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
114#define CMSG_COMPAT_LEN(len) \
115 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
116
117#define CMSG_COMPAT_FIRSTHDR(msg) \
118 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
119 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
120 (struct compat_cmsghdr __user *)NULL)
121
122#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
123 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
124 (ucmlen) <= (unsigned long) \
125 ((mhdr)->msg_controllen - \
126 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
127
128static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
129 struct compat_cmsghdr __user *cmsg, int cmsg_len)
130{
131 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
132 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
133 msg->msg_controllen)
134 return NULL;
135 return (struct compat_cmsghdr __user *)ptr;
136}
137
138/* There is a lot of hair here because the alignment rules (and
139 * thus placement) of cmsg headers and length are different for
140 * 32-bit apps. -DaveM
141 */
8920e8f9 142int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
1da177e4
LT		 143 unsigned char *stackbuf, int stackbuf_size)
144{
145 struct compat_cmsghdr __user *ucmsg;
146 struct cmsghdr *kcmsg, *kcmsg_base;
147 compat_size_t ucmlen;
148 __kernel_size_t kcmlen, tmp;
8920e8f9 149 int err = -EFAULT;
1da177e4
LT		 150
151 kcmlen = 0;
152 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
153 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783
SH		 154 while (ucmsg != NULL) {
155 if (get_user(ucmlen, &ucmsg->cmsg_len))
1da177e4
LT		 156 return -EFAULT;
157
158 /* Catch bogons. */
159 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
160 return -EINVAL;
161
162 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
163 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 164 tmp = CMSG_ALIGN(tmp);
1da177e4
LT		 165 kcmlen += tmp;
166 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
167 }
e71a4783 168 if (kcmlen == 0)
1da177e4
LT		 169 return -EINVAL;
170
171 /* The kcmlen holds the 64-bit version of the control length.
172 * It may not be modified as we do not stick it into the kmsg
173 * until we have successfully copied over all of the data
174 * from the user.
175 */
8920e8f9
AV		 176 if (kcmlen > stackbuf_size)
177 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
178 if (kcmsg == NULL)
1da177e4
LT		 179 return -ENOBUFS;
180
181 /* Now copy them over neatly. */
182 memset(kcmsg, 0, kcmlen);
183 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783 184 while (ucmsg != NULL) {
8920e8f9
AV		 185 if (__get_user(ucmlen, &ucmsg->cmsg_len))
186 goto Efault;
187 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
188 goto Einval;
1da177e4
LT		 189 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
190 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9
AV		 191 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
192 goto Einval;
1da177e4 193 kcmsg->cmsg_len = tmp;
8920e8f9
AV		 194 tmp = CMSG_ALIGN(tmp);
195 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
196 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
197 copy_from_user(CMSG_DATA(kcmsg),
198 CMSG_COMPAT_DATA(ucmsg),
199 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
200 goto Efault;
1da177e4
LT		 201
202 /* Advance. */
8920e8f9 203 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
1da177e4
LT		 204 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
205 }
206
207 /* Ok, looks like we made it. Hook it up and return success. */
208 kmsg->msg_control = kcmsg_base;
209 kmsg->msg_controllen = kcmlen;
210 return 0;
211
8920e8f9
AV		 212Einval:
213 err = -EINVAL;
214Efault:
215 if (kcmsg_base != (struct cmsghdr *)stackbuf)
216 sock_kfree_s(sk, kcmsg_base, kcmlen);
217 return err;
1da177e4
LT		 218}
219
220int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
221{
1da177e4
LT		 222 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
223 struct compat_cmsghdr cmhdr;
81881047
JJ		 224 struct compat_timeval ctv;
225 struct compat_timespec cts[3];
1da177e4
LT		 226 int cmlen;
227
e71a4783 228 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
1da177e4
LT		 229 kmsg->msg_flags |= MSG_CTRUNC;
230 return 0; /* XXX: return error? check spec. */
231 }
232
ee4fa23c 233 if (!COMPAT_USE_64BIT_TIME) {
ee4fa23c
L		 234 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
235 struct timeval *tv = (struct timeval *)data;
236 ctv.tv_sec = tv->tv_sec;
237 ctv.tv_usec = tv->tv_usec;
238 data = &ctv;
239 len = sizeof(ctv);
240 }
241 if (level == SOL_SOCKET &&
242 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
243 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
244 int i;
245 struct timespec *ts = (struct timespec *)data;
246 for (i = 0; i < count; i++) {
247 cts[i].tv_sec = ts[i].tv_sec;
248 cts[i].tv_nsec = ts[i].tv_nsec;
249 }
250 data = &cts;
251 len = sizeof(cts[0]) * count;
20d49473 252 }
4768fbcb
YH		 253 }
254
1da177e4 255 cmlen = CMSG_COMPAT_LEN(len);
e71a4783 256 if (kmsg->msg_controllen < cmlen) {
1da177e4
LT		 257 kmsg->msg_flags |= MSG_CTRUNC;
258 cmlen = kmsg->msg_controllen;
259 }
260 cmhdr.cmsg_level = level;
261 cmhdr.cmsg_type = type;
262 cmhdr.cmsg_len = cmlen;
263
e71a4783 264 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
1da177e4 265 return -EFAULT;
e71a4783 266 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
1da177e4
LT		 267 return -EFAULT;
268 cmlen = CMSG_COMPAT_SPACE(len);
1ac70e7a
WY		 269 if (kmsg->msg_controllen < cmlen)
270 cmlen = kmsg->msg_controllen;
1da177e4
LT		 271 kmsg->msg_control += cmlen;
272 kmsg->msg_controllen -= cmlen;
273 return 0;
274}
275
276void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
277{
278 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
279 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
280 int fdnum = scm->fp->count;
281 struct file **fp = scm->fp->fp;
282 int __user *cmfptr;
283 int err = 0, i;
284
285 if (fdnum < fdmax)
286 fdmax = fdnum;
287
288 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
289 int new_fd;
290 err = security_file_receive(fp[i]);
291 if (err)
292 break;
4a19542e
UD		 293 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
294 ? O_CLOEXEC : 0);
1da177e4
LT		 295 if (err < 0)
296 break;
297 new_fd = err;
298 err = put_user(new_fd, cmfptr);
299 if (err) {
300 put_unused_fd(new_fd);
301 break;
302 }
303 /* Bump the usage count and install the file. */
cb0942b8 304 fd_install(new_fd, get_file(fp[i]));
1da177e4
LT		 305 }
306
307 if (i > 0) {
308 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
effee6a0 309 err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4
LT		 310 if (!err)
311 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
312 if (!err)
313 err = put_user(cmlen, &cm->cmsg_len);
314 if (!err) {
315 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
316 kmsg->msg_control += cmlen;
317 kmsg->msg_controllen -= cmlen;
318 }
319 }
320 if (i < fdnum)
321 kmsg->msg_flags |= MSG_CTRUNC;
322
323 /*
324 * All of the files that fit in the message have had their
325 * usage counts incremented, so we just free the list.
326 */
327 __scm_destroy(scm);
328}
329
3fdadf7d 330static int do_set_attach_filter(struct socket *sock, int level, int optname,
b7058842 331 char __user *optval, unsigned int optlen)
1da177e4
LT		 332{
333 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
4768fbcb 334 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
1da177e4
LT		 335 compat_uptr_t ptr;
336 u16 len;
337
338 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
339 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
340 __get_user(len, &fprog32->len) ||
341 __get_user(ptr, &fprog32->filter) ||
342 __put_user(len, &kfprog->len) ||
343 __put_user(compat_ptr(ptr), &kfprog->filter))
344 return -EFAULT;
345
3fdadf7d 346 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
1da177e4
LT		 347 sizeof(struct sock_fprog));
348}
349
3fdadf7d 350static int do_set_sock_timeout(struct socket *sock, int level,
b7058842 351 int optname, char __user *optval, unsigned int optlen)
1da177e4 352{
c6d409cf 353 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
1da177e4
LT		 354 struct timeval ktime;
355 mm_segment_t old_fs;
356 int err;
357
358 if (optlen < sizeof(*up))
359 return -EINVAL;
360 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
361 __get_user(ktime.tv_sec, &up->tv_sec) ||
362 __get_user(ktime.tv_usec, &up->tv_usec))
363 return -EFAULT;
364 old_fs = get_fs();
365 set_fs(KERNEL_DS);
c6d409cf 366 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
1da177e4
LT		 367 set_fs(old_fs);
368
369 return err;
370}
371
3fdadf7d 372static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 373 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 374{
375 if (optname == SO_ATTACH_FILTER)
376 return do_set_attach_filter(sock, level, optname,
377 optval, optlen);
378 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
379 return do_set_sock_timeout(sock, level, optname, optval, optlen);
380
381 return sock_setsockopt(sock, level, optname, optval, optlen);
382}
383
1da177e4 384asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
b7058842 385 char __user *optval, unsigned int optlen)
1da177e4 386{
3fdadf7d 387 int err;
c6d409cf 388 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 389
c6d409cf
ED		 390 if (sock) {
391 err = security_socket_setsockopt(sock, level, optname);
3fdadf7d
DM		 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;
1da177e4
LT		 409}
410
3fdadf7d 411static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4
LT		 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);
3fdadf7d 427 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4
LT		 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
3fdadf7d 440static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4
LT		 441 char __user *optval, int __user *optlen)
442{
3fdadf7d
DM		 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);
1da177e4
LT		 446}
447
f0ac2614
SP		 448int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
449{
ee4fa23c
L		 450 struct compat_timeval __user *ctv;
451 int err;
b7aa0bf7 452 struct timeval tv;
f0ac2614 453
ee4fa23c
L		 454 if (COMPAT_USE_64BIT_TIME)
455 return sock_get_timestamp(sk, userstamp);
456
457 ctv = (struct compat_timeval __user *) userstamp;
458 err = -ENOENT;
f0ac2614 459 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 460 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 461 tv = ktime_to_timeval(sk->sk_stamp);
462 if (tv.tv_sec == -1)
f0ac2614 463 return err;
b7aa0bf7
ED		 464 if (tv.tv_sec == 0) {
465 sk->sk_stamp = ktime_get_real();
466 tv = ktime_to_timeval(sk->sk_stamp);
467 }
468 err = 0;
469 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
470 put_user(tv.tv_usec, &ctv->tv_usec))
f0ac2614
SP		 471 err = -EFAULT;
472 return err;
473}
474EXPORT_SYMBOL(compat_sock_get_timestamp);
475
ae40eb1e
ED		 476int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
477{
ee4fa23c
L		 478 struct compat_timespec __user *ctv;
479 int err;
ae40eb1e
ED		 480 struct timespec ts;
481
ee4fa23c
L		 482 if (COMPAT_USE_64BIT_TIME)
483 return sock_get_timestampns (sk, userstamp);
484
485 ctv = (struct compat_timespec __user *) userstamp;
486 err = -ENOENT;
ae40eb1e 487 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 488 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 489 ts = ktime_to_timespec(sk->sk_stamp);
490 if (ts.tv_sec == -1)
491 return err;
492 if (ts.tv_sec == 0) {
493 sk->sk_stamp = ktime_get_real();
494 ts = ktime_to_timespec(sk->sk_stamp);
495 }
496 err = 0;
497 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
498 put_user(ts.tv_nsec, &ctv->tv_nsec))
499 err = -EFAULT;
500 return err;
501}
502EXPORT_SYMBOL(compat_sock_get_timestampns);
503
3fdadf7d
DM		 504asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
505 char __user *optval, int __user *optlen)
506{
507 int err;
c6d409cf 508 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 509
c6d409cf
ED		 510 if (sock) {
511 err = security_socket_getsockopt(sock, level, optname);
3fdadf7d
DM		 512 if (err) {
513 sockfd_put(sock);
514 return err;
515 }
516
517 if (level == SOL_SOCKET)
518 err = compat_sock_getsockopt(sock, level,
519 optname, optval, optlen);
520 else if (sock->ops->compat_getsockopt)
521 err = sock->ops->compat_getsockopt(sock, level,
522 optname, optval, optlen);
523 else
524 err = sock->ops->getsockopt(sock, level,
525 optname, optval, optlen);
526 sockfd_put(sock);
527 }
528 return err;
529}
dae50295
DS		 530
531struct compat_group_req {
532 __u32 gr_interface;
533 struct __kernel_sockaddr_storage gr_group
534 __attribute__ ((aligned(4)));
bc10502d 535} __packed;
dae50295
DS		 536
537struct compat_group_source_req {
538 __u32 gsr_interface;
539 struct __kernel_sockaddr_storage gsr_group
540 __attribute__ ((aligned(4)));
541 struct __kernel_sockaddr_storage gsr_source
542 __attribute__ ((aligned(4)));
bc10502d 543} __packed;
dae50295
DS		 544
545struct compat_group_filter {
546 __u32 gf_interface;
547 struct __kernel_sockaddr_storage gf_group
548 __attribute__ ((aligned(4)));
549 __u32 gf_fmode;
550 __u32 gf_numsrc;
551 struct __kernel_sockaddr_storage gf_slist[1]
552 __attribute__ ((aligned(4)));
bc10502d 553} __packed;
dae50295 554
be666e0a
DS		 555#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
556 sizeof(struct __kernel_sockaddr_storage))
557
dae50295
DS		 558
559int compat_mc_setsockopt(struct sock *sock, int level, int optname,
b7058842 560 char __user *optval, unsigned int optlen,
c6d409cf 561 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
dae50295
DS		 562{
563 char __user *koptval = optval;
564 int koptlen = optlen;
565
566 switch (optname) {
567 case MCAST_JOIN_GROUP:
568 case MCAST_LEAVE_GROUP:
569 {
570 struct compat_group_req __user *gr32 = (void *)optval;
571 struct group_req __user *kgr =
572 compat_alloc_user_space(sizeof(struct group_req));
573 u32 interface;
574
575 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
576 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
577 __get_user(interface, &gr32->gr_interface) ||
578 __put_user(interface, &kgr->gr_interface) ||
579 copy_in_user(&kgr->gr_group, &gr32->gr_group,
580 sizeof(kgr->gr_group)))
581 return -EFAULT;
582 koptval = (char __user *)kgr;
583 koptlen = sizeof(struct group_req);
584 break;
585 }
586 case MCAST_JOIN_SOURCE_GROUP:
587 case MCAST_LEAVE_SOURCE_GROUP:
588 case MCAST_BLOCK_SOURCE:
589 case MCAST_UNBLOCK_SOURCE:
590 {
591 struct compat_group_source_req __user *gsr32 = (void *)optval;
be666e0a 592 struct group_source_req __user *kgsr = compat_alloc_user_space(
dae50295
DS		 593 sizeof(struct group_source_req));
594 u32 interface;
595
596 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
597 !access_ok(VERIFY_WRITE, kgsr,
598 sizeof(struct group_source_req)) ||
599 __get_user(interface, &gsr32->gsr_interface) ||
600 __put_user(interface, &kgsr->gsr_interface) ||
601 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
602 sizeof(kgsr->gsr_group)) ||
603 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
604 sizeof(kgsr->gsr_source)))
605 return -EFAULT;
606 koptval = (char __user *)kgsr;
607 koptlen = sizeof(struct group_source_req);
608 break;
609 }
610 case MCAST_MSFILTER:
611 {
612 struct compat_group_filter __user *gf32 = (void *)optval;
be666e0a 613 struct group_filter __user *kgf;
dae50295
DS		 614 u32 interface, fmode, numsrc;
615
be666e0a 616 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
dae50295
DS		 617 __get_user(interface, &gf32->gf_interface) ||
618 __get_user(fmode, &gf32->gf_fmode) ||
619 __get_user(numsrc, &gf32->gf_numsrc))
620 return -EFAULT;
621 koptlen = optlen + sizeof(struct group_filter) -
622 sizeof(struct compat_group_filter);
623 if (koptlen < GROUP_FILTER_SIZE(numsrc))
624 return -EINVAL;
625 kgf = compat_alloc_user_space(koptlen);
626 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
627 __put_user(interface, &kgf->gf_interface) ||
628 __put_user(fmode, &kgf->gf_fmode) ||
629 __put_user(numsrc, &kgf->gf_numsrc) ||
630 copy_in_user(&kgf->gf_group, &gf32->gf_group,
631 sizeof(kgf->gf_group)) ||
be666e0a 632 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
dae50295
DS		 633 numsrc * sizeof(kgf->gf_slist[0]))))
634 return -EFAULT;
635 koptval = (char __user *)kgf;
636 break;
637 }
638
639 default:
640 break;
641 }
642 return setsockopt(sock, level, optname, koptval, koptlen);
643}
dae50295
DS		 644EXPORT_SYMBOL(compat_mc_setsockopt);
645
42908c69
DS		 646int compat_mc_getsockopt(struct sock *sock, int level, int optname,
647 char __user *optval, int __user *optlen,
c6d409cf 648 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
42908c69
DS		 649{
650 struct compat_group_filter __user *gf32 = (void *)optval;
651 struct group_filter __user *kgf;
652 int __user *koptlen;
653 u32 interface, fmode, numsrc;
654 int klen, ulen, err;
655
656 if (optname != MCAST_MSFILTER)
657 return getsockopt(sock, level, optname, optval, optlen);
658
659 koptlen = compat_alloc_user_space(sizeof(*koptlen));
660 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
661 __get_user(ulen, optlen))
662 return -EFAULT;
663
664 /* adjust len for pad */
665 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
666
667 if (klen < GROUP_FILTER_SIZE(0))
668 return -EINVAL;
669
670 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
671 __put_user(klen, koptlen))
672 return -EFAULT;
673
674 /* have to allow space for previous compat_alloc_user_space, too */
675 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
676
677 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
678 __get_user(interface, &gf32->gf_interface) ||
679 __get_user(fmode, &gf32->gf_fmode) ||
680 __get_user(numsrc, &gf32->gf_numsrc) ||
681 __put_user(interface, &kgf->gf_interface) ||
682 __put_user(fmode, &kgf->gf_fmode) ||
683 __put_user(numsrc, &kgf->gf_numsrc) ||
c6d409cf 684 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
42908c69
DS		 685 return -EFAULT;
686
687 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
688 if (err)
689 return err;
690
691 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
692 __get_user(klen, koptlen))
693 return -EFAULT;
694
695 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
696
697 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
698 __put_user(ulen, optlen))
699 return -EFAULT;
700
701 if (!access_ok(VERIFY_READ, kgf, klen) ||
702 !access_ok(VERIFY_WRITE, gf32, ulen) ||
703 __get_user(interface, &kgf->gf_interface) ||
704 __get_user(fmode, &kgf->gf_fmode) ||
705 __get_user(numsrc, &kgf->gf_numsrc) ||
706 __put_user(interface, &gf32->gf_interface) ||
707 __put_user(fmode, &gf32->gf_fmode) ||
708 __put_user(numsrc, &gf32->gf_numsrc))
709 return -EFAULT;
710 if (numsrc) {
711 int copylen;
712
713 klen -= GROUP_FILTER_SIZE(0);
714 copylen = numsrc * sizeof(gf32->gf_slist[0]);
715 if (copylen > klen)
716 copylen = klen;
c6d409cf 717 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
42908c69
DS		 718 return -EFAULT;
719 }
720 return err;
721}
42908c69
DS		 722EXPORT_SYMBOL(compat_mc_getsockopt);
723
dae50295 724
1da177e4
LT		 725/* Argument list sizes for compat_sys_socketcall */
726#define AL(x) ((x) * sizeof(u32))
228e548e 727static unsigned char nas[21] = {
c6d409cf
ED		 728 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
729 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
730 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
228e548e 731 AL(4), AL(5), AL(4)
c6d409cf 732};
1da177e4
LT		 733#undef AL
734
95c96174 735asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
1da177e4
LT		 736{
737 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
738}
739
228e548e 740asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 741 unsigned int vlen, unsigned int flags)
228e548e
AB		 742{
743 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
744 flags | MSG_CMSG_COMPAT);
745}
746
1da177e4
LT		 747asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
748{
749 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
750}
751
95c96174 752asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
1dacc76d
JB		 753{
754 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
755}
756
757asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
95c96174 758 unsigned int flags, struct sockaddr __user *addr,
1dacc76d
JB		 759 int __user *addrlen)
760{
761 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
762}
763
a2e27255 764asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 765 unsigned int vlen, unsigned int flags,
60c2ffd3 766 struct compat_timespec __user *timeout)
a2e27255
ACM		 767{
768 int datagrams;
769 struct timespec ktspec;
a2e27255 770
ee4fa23c
L		 771 if (COMPAT_USE_64BIT_TIME)
772 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
773 flags | MSG_CMSG_COMPAT,
774 (struct timespec *) timeout);
775
5b23136b
JMG		 776 if (timeout == NULL)
777 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
778 flags | MSG_CMSG_COMPAT, NULL);
779
de039f02 780 if (get_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 781 return -EFAULT;
782
783 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
784 flags | MSG_CMSG_COMPAT, &ktspec);
de039f02 785 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 786 datagrams = -EFAULT;
787
788 return datagrams;
789}
790
1da177e4
LT		 791asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
792{
793 int ret;
794 u32 a[6];
795 u32 a0, a1;
4768fbcb 796
228e548e 797 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
1da177e4
LT		 798 return -EINVAL;
799 if (copy_from_user(a, args, nas[call]))
800 return -EFAULT;
801 a0 = a[0];
802 a1 = a[1];
4768fbcb 803
e71a4783 804 switch (call) {
1da177e4
LT		 805 case SYS_SOCKET:
806 ret = sys_socket(a0, a1, a[2]);
807 break;
808 case SYS_BIND:
809 ret = sys_bind(a0, compat_ptr(a1), a[2]);
810 break;
811 case SYS_CONNECT:
812 ret = sys_connect(a0, compat_ptr(a1), a[2]);
813 break;
814 case SYS_LISTEN:
815 ret = sys_listen(a0, a1);
816 break;
817 case SYS_ACCEPT:
de11defe 818 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
1da177e4
LT		 819 break;
820 case SYS_GETSOCKNAME:
821 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
822 break;
823 case SYS_GETPEERNAME:
824 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
825 break;
826 case SYS_SOCKETPAIR:
827 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
828 break;
829 case SYS_SEND:
830 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
831 break;
832 case SYS_SENDTO:
833 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
834 break;
835 case SYS_RECV:
1dacc76d 836 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
1da177e4
LT		 837 break;
838 case SYS_RECVFROM:
1dacc76d
JB		 839 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
840 compat_ptr(a[4]), compat_ptr(a[5]));
1da177e4
LT		 841 break;
842 case SYS_SHUTDOWN:
c6d409cf 843 ret = sys_shutdown(a0, a1);
1da177e4
LT		 844 break;
845 case SYS_SETSOCKOPT:
846 ret = compat_sys_setsockopt(a0, a1, a[2],
847 compat_ptr(a[3]), a[4]);
848 break;
849 case SYS_GETSOCKOPT:
850 ret = compat_sys_getsockopt(a0, a1, a[2],
851 compat_ptr(a[3]), compat_ptr(a[4]));
852 break;
853 case SYS_SENDMSG:
854 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
855 break;
228e548e
AB		 856 case SYS_SENDMMSG:
857 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
858 break;
1da177e4
LT		 859 case SYS_RECVMSG:
860 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
861 break;
a2e27255
ACM		 862 case SYS_RECVMMSG:
863 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
864 compat_ptr(a[4]));
865 break;
de11defe
UD		 866 case SYS_ACCEPT4:
867 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
aaca0bdc 868 break;
1da177e4
LT		 869 default:
870 ret = -EINVAL;
871 break;
872 }
873 return ret;
874}
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