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xtensa: fix ATOMCTL register documentation
[mirror_ubuntu-artful-kernel.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 <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>
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;
1661bf36 74 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
db31c55a 75 kmsg->msg_namelen = sizeof(struct sockaddr_storage);
1da177e4
LT		 76 kmsg->msg_name = compat_ptr(tmp1);
77 kmsg->msg_iov = compat_ptr(tmp2);
78 kmsg->msg_control = compat_ptr(tmp3);
79 return 0;
80}
81
82/* I've named the args so it is easy to tell whose space the pointers are in. */
83int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
43db362d 84 struct sockaddr_storage *kern_address, int mode)
1da177e4
LT		 85{
86 int tot_len;
87
e71a4783 88 if (kern_msg->msg_namelen) {
c6d409cf 89 if (mode == VERIFY_READ) {
1da177e4
LT		 90 int err = move_addr_to_kernel(kern_msg->msg_name,
91 kern_msg->msg_namelen,
92 kern_address);
e71a4783 93 if (err < 0)
1da177e4
LT		 94 return err;
95 }
f3d33426
HFS		 96 if (kern_msg->msg_name)
97 kern_msg->msg_name = kern_address;
1da177e4
LT		 98 } else
99 kern_msg->msg_name = NULL;
100
1da177e4
LT		 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);
e71a4783 104 if (tot_len >= 0)
1da177e4 105 kern_msg->msg_iov = kern_iov;
1da177e4
LT		 106
107 return tot_len;
108}
109
110/* Bleech... */
111#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
112
113#define CMSG_COMPAT_DATA(cmsg) \
114 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
115#define CMSG_COMPAT_SPACE(len) \
116 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
117#define CMSG_COMPAT_LEN(len) \
118 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
119
120#define CMSG_COMPAT_FIRSTHDR(msg) \
121 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
122 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
123 (struct compat_cmsghdr __user *)NULL)
124
125#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
126 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
127 (ucmlen) <= (unsigned long) \
128 ((mhdr)->msg_controllen - \
129 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
130
131static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
132 struct compat_cmsghdr __user *cmsg, int cmsg_len)
133{
134 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
135 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
136 msg->msg_controllen)
137 return NULL;
138 return (struct compat_cmsghdr __user *)ptr;
139}
140
141/* There is a lot of hair here because the alignment rules (and
142 * thus placement) of cmsg headers and length are different for
143 * 32-bit apps. -DaveM
144 */
8920e8f9 145int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
1da177e4
LT		 146 unsigned char *stackbuf, int stackbuf_size)
147{
148 struct compat_cmsghdr __user *ucmsg;
149 struct cmsghdr *kcmsg, *kcmsg_base;
150 compat_size_t ucmlen;
151 __kernel_size_t kcmlen, tmp;
8920e8f9 152 int err = -EFAULT;
1da177e4
LT		 153
154 kcmlen = 0;
155 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
156 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783
SH		 157 while (ucmsg != NULL) {
158 if (get_user(ucmlen, &ucmsg->cmsg_len))
1da177e4
LT		 159 return -EFAULT;
160
161 /* Catch bogons. */
162 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
163 return -EINVAL;
164
165 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
166 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 167 tmp = CMSG_ALIGN(tmp);
1da177e4
LT		 168 kcmlen += tmp;
169 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
170 }
e71a4783 171 if (kcmlen == 0)
1da177e4
LT		 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 */
8920e8f9
AV		 179 if (kcmlen > stackbuf_size)
180 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
181 if (kcmsg == NULL)
1da177e4
LT		 182 return -ENOBUFS;
183
184 /* Now copy them over neatly. */
185 memset(kcmsg, 0, kcmlen);
186 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783 187 while (ucmsg != NULL) {
8920e8f9
AV		 188 if (__get_user(ucmlen, &ucmsg->cmsg_len))
189 goto Efault;
190 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
191 goto Einval;
1da177e4
LT		 192 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
193 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9
AV		 194 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
195 goto Einval;
1da177e4 196 kcmsg->cmsg_len = tmp;
8920e8f9
AV		 197 tmp = CMSG_ALIGN(tmp);
198 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
199 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
200 copy_from_user(CMSG_DATA(kcmsg),
201 CMSG_COMPAT_DATA(ucmsg),
202 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
203 goto Efault;
1da177e4
LT		 204
205 /* Advance. */
8920e8f9 206 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
1da177e4
LT		 207 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
208 }
209
210 /* Ok, looks like we made it. Hook it up and return success. */
211 kmsg->msg_control = kcmsg_base;
212 kmsg->msg_controllen = kcmlen;
213 return 0;
214
8920e8f9
AV		 215Einval:
216 err = -EINVAL;
217Efault:
218 if (kcmsg_base != (struct cmsghdr *)stackbuf)
219 sock_kfree_s(sk, kcmsg_base, kcmlen);
220 return err;
1da177e4
LT		 221}
222
223int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
224{
1da177e4
LT		 225 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
226 struct compat_cmsghdr cmhdr;
81881047
JJ		 227 struct compat_timeval ctv;
228 struct compat_timespec cts[3];
1da177e4
LT		 229 int cmlen;
230
e71a4783 231 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
1da177e4
LT		 232 kmsg->msg_flags |= MSG_CTRUNC;
233 return 0; /* XXX: return error? check spec. */
234 }
235
ee4fa23c 236 if (!COMPAT_USE_64BIT_TIME) {
ee4fa23c
L		 237 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
238 struct timeval *tv = (struct timeval *)data;
239 ctv.tv_sec = tv->tv_sec;
240 ctv.tv_usec = tv->tv_usec;
241 data = &ctv;
242 len = sizeof(ctv);
243 }
244 if (level == SOL_SOCKET &&
245 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
246 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
247 int i;
248 struct timespec *ts = (struct timespec *)data;
249 for (i = 0; i < count; i++) {
250 cts[i].tv_sec = ts[i].tv_sec;
251 cts[i].tv_nsec = ts[i].tv_nsec;
252 }
253 data = &cts;
254 len = sizeof(cts[0]) * count;
20d49473 255 }
4768fbcb
YH		 256 }
257
1da177e4 258 cmlen = CMSG_COMPAT_LEN(len);
e71a4783 259 if (kmsg->msg_controllen < cmlen) {
1da177e4
LT		 260 kmsg->msg_flags |= MSG_CTRUNC;
261 cmlen = kmsg->msg_controllen;
262 }
263 cmhdr.cmsg_level = level;
264 cmhdr.cmsg_type = type;
265 cmhdr.cmsg_len = cmlen;
266
e71a4783 267 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
1da177e4 268 return -EFAULT;
e71a4783 269 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
1da177e4
LT		 270 return -EFAULT;
271 cmlen = CMSG_COMPAT_SPACE(len);
1ac70e7a
WY		 272 if (kmsg->msg_controllen < cmlen)
273 cmlen = kmsg->msg_controllen;
1da177e4
LT		 274 kmsg->msg_control += cmlen;
275 kmsg->msg_controllen -= cmlen;
276 return 0;
277}
278
279void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
280{
281 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
282 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
283 int fdnum = scm->fp->count;
284 struct file **fp = scm->fp->fp;
285 int __user *cmfptr;
286 int err = 0, i;
287
288 if (fdnum < fdmax)
289 fdmax = fdnum;
290
291 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
292 int new_fd;
293 err = security_file_receive(fp[i]);
294 if (err)
295 break;
4a19542e
UD		 296 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
297 ? O_CLOEXEC : 0);
1da177e4
LT		 298 if (err < 0)
299 break;
300 new_fd = err;
301 err = put_user(new_fd, cmfptr);
302 if (err) {
303 put_unused_fd(new_fd);
304 break;
305 }
306 /* Bump the usage count and install the file. */
cb0942b8 307 fd_install(new_fd, get_file(fp[i]));
1da177e4
LT		 308 }
309
310 if (i > 0) {
311 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
effee6a0 312 err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4
LT		 313 if (!err)
314 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
315 if (!err)
316 err = put_user(cmlen, &cm->cmsg_len);
317 if (!err) {
318 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
319 kmsg->msg_control += cmlen;
320 kmsg->msg_controllen -= cmlen;
321 }
322 }
323 if (i < fdnum)
324 kmsg->msg_flags |= MSG_CTRUNC;
325
326 /*
327 * All of the files that fit in the message have had their
328 * usage counts incremented, so we just free the list.
329 */
330 __scm_destroy(scm);
331}
332
3fdadf7d 333static int do_set_attach_filter(struct socket *sock, int level, int optname,
b7058842 334 char __user *optval, unsigned int optlen)
1da177e4
LT		 335{
336 struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
4768fbcb 337 struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
1da177e4
LT		 338 compat_uptr_t ptr;
339 u16 len;
340
341 if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
342 !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
343 __get_user(len, &fprog32->len) ||
344 __get_user(ptr, &fprog32->filter) ||
345 __put_user(len, &kfprog->len) ||
346 __put_user(compat_ptr(ptr), &kfprog->filter))
347 return -EFAULT;
348
3fdadf7d 349 return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
1da177e4
LT		 350 sizeof(struct sock_fprog));
351}
352
3fdadf7d 353static int do_set_sock_timeout(struct socket *sock, int level,
b7058842 354 int optname, char __user *optval, unsigned int optlen)
1da177e4 355{
c6d409cf 356 struct compat_timeval __user *up = (struct compat_timeval __user *)optval;
1da177e4
LT		 357 struct timeval ktime;
358 mm_segment_t old_fs;
359 int err;
360
361 if (optlen < sizeof(*up))
362 return -EINVAL;
363 if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
364 __get_user(ktime.tv_sec, &up->tv_sec) ||
365 __get_user(ktime.tv_usec, &up->tv_usec))
366 return -EFAULT;
367 old_fs = get_fs();
368 set_fs(KERNEL_DS);
c6d409cf 369 err = sock_setsockopt(sock, level, optname, (char *)&ktime, sizeof(ktime));
1da177e4
LT		 370 set_fs(old_fs);
371
372 return err;
373}
374
3fdadf7d 375static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
b7058842 376 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 377{
378 if (optname == SO_ATTACH_FILTER)
379 return do_set_attach_filter(sock, level, optname,
380 optval, optlen);
381 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
382 return do_set_sock_timeout(sock, level, optname, optval, optlen);
383
384 return sock_setsockopt(sock, level, optname, optval, optlen);
385}
386
1da177e4 387asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
b7058842 388 char __user *optval, unsigned int optlen)
1da177e4 389{
3fdadf7d 390 int err;
c6d409cf 391 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 392
c6d409cf
ED		 393 if (sock) {
394 err = security_socket_setsockopt(sock, level, optname);
3fdadf7d
DM		 395 if (err) {
396 sockfd_put(sock);
397 return err;
398 }
399
400 if (level == SOL_SOCKET)
401 err = compat_sock_setsockopt(sock, level,
402 optname, optval, optlen);
403 else if (sock->ops->compat_setsockopt)
404 err = sock->ops->compat_setsockopt(sock, level,
405 optname, optval, optlen);
406 else
407 err = sock->ops->setsockopt(sock, level,
408 optname, optval, optlen);
409 sockfd_put(sock);
410 }
411 return err;
1da177e4
LT		 412}
413
3fdadf7d 414static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4
LT		 415 char __user *optval, int __user *optlen)
416{
417 struct compat_timeval __user *up;
418 struct timeval ktime;
419 mm_segment_t old_fs;
420 int len, err;
421
422 up = (struct compat_timeval __user *) optval;
423 if (get_user(len, optlen))
424 return -EFAULT;
425 if (len < sizeof(*up))
426 return -EINVAL;
427 len = sizeof(ktime);
428 old_fs = get_fs();
429 set_fs(KERNEL_DS);
3fdadf7d 430 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4
LT		 431 set_fs(old_fs);
432
433 if (!err) {
434 if (put_user(sizeof(*up), optlen) ||
435 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
436 __put_user(ktime.tv_sec, &up->tv_sec) ||
437 __put_user(ktime.tv_usec, &up->tv_usec))
438 err = -EFAULT;
439 }
440 return err;
441}
442
3fdadf7d 443static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4
LT		 444 char __user *optval, int __user *optlen)
445{
3fdadf7d
DM		 446 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
447 return do_get_sock_timeout(sock, level, optname, optval, optlen);
448 return sock_getsockopt(sock, level, optname, optval, optlen);
1da177e4
LT		 449}
450
f0ac2614
SP		 451int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
452{
ee4fa23c
L		 453 struct compat_timeval __user *ctv;
454 int err;
b7aa0bf7 455 struct timeval tv;
f0ac2614 456
ee4fa23c
L		 457 if (COMPAT_USE_64BIT_TIME)
458 return sock_get_timestamp(sk, userstamp);
459
460 ctv = (struct compat_timeval __user *) userstamp;
461 err = -ENOENT;
f0ac2614 462 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 463 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
b7aa0bf7
ED		 464 tv = ktime_to_timeval(sk->sk_stamp);
465 if (tv.tv_sec == -1)
f0ac2614 466 return err;
b7aa0bf7
ED		 467 if (tv.tv_sec == 0) {
468 sk->sk_stamp = ktime_get_real();
469 tv = ktime_to_timeval(sk->sk_stamp);
470 }
471 err = 0;
472 if (put_user(tv.tv_sec, &ctv->tv_sec) ||
473 put_user(tv.tv_usec, &ctv->tv_usec))
f0ac2614
SP		 474 err = -EFAULT;
475 return err;
476}
477EXPORT_SYMBOL(compat_sock_get_timestamp);
478
ae40eb1e
ED		 479int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
480{
ee4fa23c
L		 481 struct compat_timespec __user *ctv;
482 int err;
ae40eb1e
ED		 483 struct timespec ts;
484
ee4fa23c
L		 485 if (COMPAT_USE_64BIT_TIME)
486 return sock_get_timestampns (sk, userstamp);
487
488 ctv = (struct compat_timespec __user *) userstamp;
489 err = -ENOENT;
ae40eb1e 490 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 491 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 492 ts = ktime_to_timespec(sk->sk_stamp);
493 if (ts.tv_sec == -1)
494 return err;
495 if (ts.tv_sec == 0) {
496 sk->sk_stamp = ktime_get_real();
497 ts = ktime_to_timespec(sk->sk_stamp);
498 }
499 err = 0;
500 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
501 put_user(ts.tv_nsec, &ctv->tv_nsec))
502 err = -EFAULT;
503 return err;
504}
505EXPORT_SYMBOL(compat_sock_get_timestampns);
506
3fdadf7d
DM		 507asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
508 char __user *optval, int __user *optlen)
509{
510 int err;
c6d409cf 511 struct socket *sock = sockfd_lookup(fd, &err);
3fdadf7d 512
c6d409cf
ED		 513 if (sock) {
514 err = security_socket_getsockopt(sock, level, optname);
3fdadf7d
DM		 515 if (err) {
516 sockfd_put(sock);
517 return err;
518 }
519
520 if (level == SOL_SOCKET)
521 err = compat_sock_getsockopt(sock, level,
522 optname, optval, optlen);
523 else if (sock->ops->compat_getsockopt)
524 err = sock->ops->compat_getsockopt(sock, level,
525 optname, optval, optlen);
526 else
527 err = sock->ops->getsockopt(sock, level,
528 optname, optval, optlen);
529 sockfd_put(sock);
530 }
531 return err;
532}
dae50295
DS		 533
534struct compat_group_req {
535 __u32 gr_interface;
536 struct __kernel_sockaddr_storage gr_group
537 __attribute__ ((aligned(4)));
bc10502d 538} __packed;
dae50295
DS		 539
540struct compat_group_source_req {
541 __u32 gsr_interface;
542 struct __kernel_sockaddr_storage gsr_group
543 __attribute__ ((aligned(4)));
544 struct __kernel_sockaddr_storage gsr_source
545 __attribute__ ((aligned(4)));
bc10502d 546} __packed;
dae50295
DS		 547
548struct compat_group_filter {
549 __u32 gf_interface;
550 struct __kernel_sockaddr_storage gf_group
551 __attribute__ ((aligned(4)));
552 __u32 gf_fmode;
553 __u32 gf_numsrc;
554 struct __kernel_sockaddr_storage gf_slist[1]
555 __attribute__ ((aligned(4)));
bc10502d 556} __packed;
dae50295 557
be666e0a
DS		 558#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
559 sizeof(struct __kernel_sockaddr_storage))
560
dae50295
DS		 561
562int compat_mc_setsockopt(struct sock *sock, int level, int optname,
b7058842 563 char __user *optval, unsigned int optlen,
c6d409cf 564 int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))
dae50295
DS		 565{
566 char __user *koptval = optval;
567 int koptlen = optlen;
568
569 switch (optname) {
570 case MCAST_JOIN_GROUP:
571 case MCAST_LEAVE_GROUP:
572 {
573 struct compat_group_req __user *gr32 = (void *)optval;
574 struct group_req __user *kgr =
575 compat_alloc_user_space(sizeof(struct group_req));
576 u32 interface;
577
578 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
579 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
580 __get_user(interface, &gr32->gr_interface) ||
581 __put_user(interface, &kgr->gr_interface) ||
582 copy_in_user(&kgr->gr_group, &gr32->gr_group,
583 sizeof(kgr->gr_group)))
584 return -EFAULT;
585 koptval = (char __user *)kgr;
586 koptlen = sizeof(struct group_req);
587 break;
588 }
589 case MCAST_JOIN_SOURCE_GROUP:
590 case MCAST_LEAVE_SOURCE_GROUP:
591 case MCAST_BLOCK_SOURCE:
592 case MCAST_UNBLOCK_SOURCE:
593 {
594 struct compat_group_source_req __user *gsr32 = (void *)optval;
be666e0a 595 struct group_source_req __user *kgsr = compat_alloc_user_space(
dae50295
DS		 596 sizeof(struct group_source_req));
597 u32 interface;
598
599 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
600 !access_ok(VERIFY_WRITE, kgsr,
601 sizeof(struct group_source_req)) ||
602 __get_user(interface, &gsr32->gsr_interface) ||
603 __put_user(interface, &kgsr->gsr_interface) ||
604 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
605 sizeof(kgsr->gsr_group)) ||
606 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
607 sizeof(kgsr->gsr_source)))
608 return -EFAULT;
609 koptval = (char __user *)kgsr;
610 koptlen = sizeof(struct group_source_req);
611 break;
612 }
613 case MCAST_MSFILTER:
614 {
615 struct compat_group_filter __user *gf32 = (void *)optval;
be666e0a 616 struct group_filter __user *kgf;
dae50295
DS		 617 u32 interface, fmode, numsrc;
618
be666e0a 619 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
dae50295
DS		 620 __get_user(interface, &gf32->gf_interface) ||
621 __get_user(fmode, &gf32->gf_fmode) ||
622 __get_user(numsrc, &gf32->gf_numsrc))
623 return -EFAULT;
624 koptlen = optlen + sizeof(struct group_filter) -
625 sizeof(struct compat_group_filter);
626 if (koptlen < GROUP_FILTER_SIZE(numsrc))
627 return -EINVAL;
628 kgf = compat_alloc_user_space(koptlen);
629 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
630 __put_user(interface, &kgf->gf_interface) ||
631 __put_user(fmode, &kgf->gf_fmode) ||
632 __put_user(numsrc, &kgf->gf_numsrc) ||
633 copy_in_user(&kgf->gf_group, &gf32->gf_group,
634 sizeof(kgf->gf_group)) ||
be666e0a 635 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
dae50295
DS		 636 numsrc * sizeof(kgf->gf_slist[0]))))
637 return -EFAULT;
638 koptval = (char __user *)kgf;
639 break;
640 }
641
642 default:
643 break;
644 }
645 return setsockopt(sock, level, optname, koptval, koptlen);
646}
dae50295
DS		 647EXPORT_SYMBOL(compat_mc_setsockopt);
648
42908c69
DS		 649int compat_mc_getsockopt(struct sock *sock, int level, int optname,
650 char __user *optval, int __user *optlen,
c6d409cf 651 int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
42908c69
DS		 652{
653 struct compat_group_filter __user *gf32 = (void *)optval;
654 struct group_filter __user *kgf;
655 int __user *koptlen;
656 u32 interface, fmode, numsrc;
657 int klen, ulen, err;
658
659 if (optname != MCAST_MSFILTER)
660 return getsockopt(sock, level, optname, optval, optlen);
661
662 koptlen = compat_alloc_user_space(sizeof(*koptlen));
663 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
664 __get_user(ulen, optlen))
665 return -EFAULT;
666
667 /* adjust len for pad */
668 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
669
670 if (klen < GROUP_FILTER_SIZE(0))
671 return -EINVAL;
672
673 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
674 __put_user(klen, koptlen))
675 return -EFAULT;
676
677 /* have to allow space for previous compat_alloc_user_space, too */
678 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
679
680 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
681 __get_user(interface, &gf32->gf_interface) ||
682 __get_user(fmode, &gf32->gf_fmode) ||
683 __get_user(numsrc, &gf32->gf_numsrc) ||
684 __put_user(interface, &kgf->gf_interface) ||
685 __put_user(fmode, &kgf->gf_fmode) ||
686 __put_user(numsrc, &kgf->gf_numsrc) ||
c6d409cf 687 copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
42908c69
DS		 688 return -EFAULT;
689
690 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
691 if (err)
692 return err;
693
694 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
695 __get_user(klen, koptlen))
696 return -EFAULT;
697
698 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
699
700 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
701 __put_user(ulen, optlen))
702 return -EFAULT;
703
704 if (!access_ok(VERIFY_READ, kgf, klen) ||
705 !access_ok(VERIFY_WRITE, gf32, ulen) ||
706 __get_user(interface, &kgf->gf_interface) ||
707 __get_user(fmode, &kgf->gf_fmode) ||
708 __get_user(numsrc, &kgf->gf_numsrc) ||
709 __put_user(interface, &gf32->gf_interface) ||
710 __put_user(fmode, &gf32->gf_fmode) ||
711 __put_user(numsrc, &gf32->gf_numsrc))
712 return -EFAULT;
713 if (numsrc) {
714 int copylen;
715
716 klen -= GROUP_FILTER_SIZE(0);
717 copylen = numsrc * sizeof(gf32->gf_slist[0]);
718 if (copylen > klen)
719 copylen = klen;
c6d409cf 720 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
42908c69
DS		 721 return -EFAULT;
722 }
723 return err;
724}
42908c69
DS		 725EXPORT_SYMBOL(compat_mc_getsockopt);
726
dae50295 727
1da177e4
LT		 728/* Argument list sizes for compat_sys_socketcall */
729#define AL(x) ((x) * sizeof(u32))
228e548e 730static unsigned char nas[21] = {
c6d409cf
ED		 731 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3),
732 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6),
733 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3),
228e548e 734 AL(4), AL(5), AL(4)
c6d409cf 735};
1da177e4
LT		 736#undef AL
737
95c96174 738asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
1da177e4 739{
a7526eb5
AL		 740 if (flags & MSG_CMSG_COMPAT)
741 return -EINVAL;
742 return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
1da177e4
LT		 743}
744
228e548e 745asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 746 unsigned int vlen, unsigned int flags)
228e548e 747{
a7526eb5
AL		 748 if (flags & MSG_CMSG_COMPAT)
749 return -EINVAL;
228e548e
AB		 750 return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
751 flags | MSG_CMSG_COMPAT);
752}
753
1da177e4
LT		 754asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
755{
a7526eb5
AL		 756 if (flags & MSG_CMSG_COMPAT)
757 return -EINVAL;
758 return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
1da177e4
LT		 759}
760
95c96174 761asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
1dacc76d
JB		 762{
763 return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
764}
765
766asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
95c96174 767 unsigned int flags, struct sockaddr __user *addr,
1dacc76d
JB		 768 int __user *addrlen)
769{
770 return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
771}
772
a2e27255 773asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
95c96174 774 unsigned int vlen, unsigned int flags,
60c2ffd3 775 struct compat_timespec __user *timeout)
a2e27255
ACM		 776{
777 int datagrams;
778 struct timespec ktspec;
a2e27255 779
a7526eb5
AL		 780 if (flags & MSG_CMSG_COMPAT)
781 return -EINVAL;
782
ee4fa23c
L		 783 if (COMPAT_USE_64BIT_TIME)
784 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
785 flags | MSG_CMSG_COMPAT,
786 (struct timespec *) timeout);
787
5b23136b
JMG		 788 if (timeout == NULL)
789 return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
790 flags | MSG_CMSG_COMPAT, NULL);
791
de039f02 792 if (get_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 793 return -EFAULT;
794
795 datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
796 flags | MSG_CMSG_COMPAT, &ktspec);
de039f02 797 if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))
a2e27255
ACM		 798 datagrams = -EFAULT;
799
800 return datagrams;
801}
802
1da177e4
LT		 803asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
804{
805 int ret;
806 u32 a[6];
807 u32 a0, a1;
4768fbcb 808
228e548e 809 if (call < SYS_SOCKET || call > SYS_SENDMMSG)
1da177e4
LT		 810 return -EINVAL;
811 if (copy_from_user(a, args, nas[call]))
812 return -EFAULT;
813 a0 = a[0];
814 a1 = a[1];
4768fbcb 815
e71a4783 816 switch (call) {
1da177e4
LT		 817 case SYS_SOCKET:
818 ret = sys_socket(a0, a1, a[2]);
819 break;
820 case SYS_BIND:
821 ret = sys_bind(a0, compat_ptr(a1), a[2]);
822 break;
823 case SYS_CONNECT:
824 ret = sys_connect(a0, compat_ptr(a1), a[2]);
825 break;
826 case SYS_LISTEN:
827 ret = sys_listen(a0, a1);
828 break;
829 case SYS_ACCEPT:
de11defe 830 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
1da177e4
LT		 831 break;
832 case SYS_GETSOCKNAME:
833 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
834 break;
835 case SYS_GETPEERNAME:
836 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
837 break;
838 case SYS_SOCKETPAIR:
839 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
840 break;
841 case SYS_SEND:
842 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
843 break;
844 case SYS_SENDTO:
845 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
846 break;
847 case SYS_RECV:
1dacc76d 848 ret = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);
1da177e4
LT		 849 break;
850 case SYS_RECVFROM:
1dacc76d
JB		 851 ret = compat_sys_recvfrom(a0, compat_ptr(a1), a[2], a[3],
852 compat_ptr(a[4]), compat_ptr(a[5]));
1da177e4
LT		 853 break;
854 case SYS_SHUTDOWN:
c6d409cf 855 ret = sys_shutdown(a0, a1);
1da177e4
LT		 856 break;
857 case SYS_SETSOCKOPT:
858 ret = compat_sys_setsockopt(a0, a1, a[2],
859 compat_ptr(a[3]), a[4]);
860 break;
861 case SYS_GETSOCKOPT:
862 ret = compat_sys_getsockopt(a0, a1, a[2],
863 compat_ptr(a[3]), compat_ptr(a[4]));
864 break;
865 case SYS_SENDMSG:
866 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
867 break;
228e548e
AB		 868 case SYS_SENDMMSG:
869 ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
870 break;
1da177e4
LT		 871 case SYS_RECVMSG:
872 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
873 break;
a2e27255
ACM		 874 case SYS_RECVMMSG:
875 ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
876 compat_ptr(a[4]));
877 break;
de11defe
UD		 878 case SYS_ACCEPT4:
879 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
aaca0bdc 880 break;
1da177e4
LT		 881 default:
882 ret = -EINVAL;
883 break;
884 }
885 return ret;
886}
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