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netdev: restore MTU change operation
[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>
15#include <linux/fs.h>
1da177e4
LT		 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>
1da177e4
LT		 23#include <linux/security.h>
24
25#include <net/scm.h>
26#include <net/sock.h>
dae50295
DS		 27#include <net/ip.h>
28#include <net/ipv6.h>
1da177e4
LT		 29#include <asm/uaccess.h>
30#include <net/compat.h>
31
32static 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
e71a4783 38 while (niov > 0) {
1da177e4
LT		 39 compat_uptr_t buf;
40 compat_size_t len;
41
e71a4783 42 if (get_user(len, &uiov32->iov_len) ||
1da177e4
LT		 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
57int 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. */
77int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
230b1839 78 struct sockaddr *kern_address, int mode)
1da177e4
LT		 79{
80 int tot_len;
81
e71a4783
SH		 82 if (kern_msg->msg_namelen) {
83 if (mode==VERIFY_READ) {
1da177e4
LT		 84 int err = move_addr_to_kernel(kern_msg->msg_name,
85 kern_msg->msg_namelen,
86 kern_address);
e71a4783 87 if (err < 0)
1da177e4
LT		 88 return err;
89 }
90 kern_msg->msg_name = kern_address;
91 } else
92 kern_msg->msg_name = NULL;
93
1da177e4
LT		 94 tot_len = iov_from_user_compat_to_kern(kern_iov,
95 (struct compat_iovec __user *)kern_msg->msg_iov,
96 kern_msg->msg_iovlen);
e71a4783 97 if (tot_len >= 0)
1da177e4 98 kern_msg->msg_iov = kern_iov;
1da177e4
LT		 99
100 return tot_len;
101}
102
103/* Bleech... */
104#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
105
106#define CMSG_COMPAT_DATA(cmsg) \
107 ((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
108#define CMSG_COMPAT_SPACE(len) \
109 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
110#define CMSG_COMPAT_LEN(len) \
111 (CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
112
113#define CMSG_COMPAT_FIRSTHDR(msg) \
114 (((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
115 (struct compat_cmsghdr __user *)((msg)->msg_control) : \
116 (struct compat_cmsghdr __user *)NULL)
117
118#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
119 ((ucmlen) >= sizeof(struct compat_cmsghdr) && \
120 (ucmlen) <= (unsigned long) \
121 ((mhdr)->msg_controllen - \
122 ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))
123
124static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
125 struct compat_cmsghdr __user *cmsg, int cmsg_len)
126{
127 char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
128 if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
129 msg->msg_controllen)
130 return NULL;
131 return (struct compat_cmsghdr __user *)ptr;
132}
133
134/* There is a lot of hair here because the alignment rules (and
135 * thus placement) of cmsg headers and length are different for
136 * 32-bit apps. -DaveM
137 */
8920e8f9 138int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
1da177e4
LT		 139 unsigned char *stackbuf, int stackbuf_size)
140{
141 struct compat_cmsghdr __user *ucmsg;
142 struct cmsghdr *kcmsg, *kcmsg_base;
143 compat_size_t ucmlen;
144 __kernel_size_t kcmlen, tmp;
8920e8f9 145 int err = -EFAULT;
1da177e4
LT		 146
147 kcmlen = 0;
148 kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
149 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783
SH		 150 while (ucmsg != NULL) {
151 if (get_user(ucmlen, &ucmsg->cmsg_len))
1da177e4
LT		 152 return -EFAULT;
153
154 /* Catch bogons. */
155 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
156 return -EINVAL;
157
158 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
159 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 160 tmp = CMSG_ALIGN(tmp);
1da177e4
LT		 161 kcmlen += tmp;
162 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
163 }
e71a4783 164 if (kcmlen == 0)
1da177e4
LT		 165 return -EINVAL;
166
167 /* The kcmlen holds the 64-bit version of the control length.
168 * It may not be modified as we do not stick it into the kmsg
169 * until we have successfully copied over all of the data
170 * from the user.
171 */
8920e8f9
AV		 172 if (kcmlen > stackbuf_size)
173 kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
174 if (kcmsg == NULL)
1da177e4
LT		 175 return -ENOBUFS;
176
177 /* Now copy them over neatly. */
178 memset(kcmsg, 0, kcmlen);
179 ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
e71a4783 180 while (ucmsg != NULL) {
8920e8f9
AV		 181 if (__get_user(ucmlen, &ucmsg->cmsg_len))
182 goto Efault;
183 if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
184 goto Einval;
1da177e4
LT		 185 tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
186 CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9
AV		 187 if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
188 goto Einval;
1da177e4 189 kcmsg->cmsg_len = tmp;
8920e8f9
AV		 190 tmp = CMSG_ALIGN(tmp);
191 if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
192 __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
193 copy_from_user(CMSG_DATA(kcmsg),
194 CMSG_COMPAT_DATA(ucmsg),
195 (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
196 goto Efault;
1da177e4
LT		 197
198 /* Advance. */
8920e8f9 199 kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
1da177e4
LT		 200 ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
201 }
202
203 /* Ok, looks like we made it. Hook it up and return success. */
204 kmsg->msg_control = kcmsg_base;
205 kmsg->msg_controllen = kcmlen;
206 return 0;
207
8920e8f9
AV		 208Einval:
209 err = -EINVAL;
210Efault:
211 if (kcmsg_base != (struct cmsghdr *)stackbuf)
212 sock_kfree_s(sk, kcmsg_base, kcmlen);
213 return err;
1da177e4
LT		 214}
215
216int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
217{
218 struct compat_timeval ctv;
20d49473 219 struct compat_timespec cts[3];
1da177e4
LT		 220 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
221 struct compat_cmsghdr cmhdr;
222 int cmlen;
223
e71a4783 224 if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
1da177e4
LT		 225 kmsg->msg_flags |= MSG_CTRUNC;
226 return 0; /* XXX: return error? check spec. */
227 }
228
d35aac10 229 if (level == SOL_SOCKET && type == SCM_TIMESTAMP) {
1da177e4
LT		 230 struct timeval *tv = (struct timeval *)data;
231 ctv.tv_sec = tv->tv_sec;
232 ctv.tv_usec = tv->tv_usec;
233 data = &ctv;
92f37fd2
ED		 234 len = sizeof(ctv);
235 }
20d49473
PO		 236 if (level == SOL_SOCKET &&
237 (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
238 int count = type == SCM_TIMESTAMPNS ? 1 : 3;
239 int i;
92f37fd2 240 struct timespec *ts = (struct timespec *)data;
20d49473
PO		 241 for (i = 0; i < count; i++) {
242 cts[i].tv_sec = ts[i].tv_sec;
243 cts[i].tv_nsec = ts[i].tv_nsec;
244 }
92f37fd2 245 data = &cts;
20d49473 246 len = sizeof(cts[0]) * count;
4768fbcb
YH		 247 }
248
1da177e4 249 cmlen = CMSG_COMPAT_LEN(len);
e71a4783 250 if (kmsg->msg_controllen < cmlen) {
1da177e4
LT		 251 kmsg->msg_flags |= MSG_CTRUNC;
252 cmlen = kmsg->msg_controllen;
253 }
254 cmhdr.cmsg_level = level;
255 cmhdr.cmsg_type = type;
256 cmhdr.cmsg_len = cmlen;
257
e71a4783 258 if (copy_to_user(cm, &cmhdr, sizeof cmhdr))
1da177e4 259 return -EFAULT;
e71a4783 260 if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
1da177e4
LT		 261 return -EFAULT;
262 cmlen = CMSG_COMPAT_SPACE(len);
1ac70e7a
WY		 263 if (kmsg->msg_controllen < cmlen)
264 cmlen = kmsg->msg_controllen;
1da177e4
LT		 265 kmsg->msg_control += cmlen;
266 kmsg->msg_controllen -= cmlen;
267 return 0;
268}
269
270void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
271{
272 struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
273 int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
274 int fdnum = scm->fp->count;
275 struct file **fp = scm->fp->fp;
276 int __user *cmfptr;
277 int err = 0, i;
278
279 if (fdnum < fdmax)
280 fdmax = fdnum;
281
282 for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
283 int new_fd;
284 err = security_file_receive(fp[i]);
285 if (err)
286 break;
4a19542e
UD		 287 err = get_unused_fd_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
288 ? O_CLOEXEC : 0);
1da177e4
LT		 289 if (err < 0)
290 break;
291 new_fd = err;
292 err = put_user(new_fd, cmfptr);
293 if (err) {
294 put_unused_fd(new_fd);
295 break;
296 }
297 /* Bump the usage count and install the file. */
298 get_file(fp[i]);
299 fd_install(new_fd, fp[i]);
300 }
301
302 if (i > 0) {
303 int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
effee6a0 304 err = put_user(SOL_SOCKET, &cm->cmsg_level);
1da177e4
LT		 305 if (!err)
306 err = put_user(SCM_RIGHTS, &cm->cmsg_type);
307 if (!err)
308 err = put_user(cmlen, &cm->cmsg_len);
309 if (!err) {
310 cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
311 kmsg->msg_control += cmlen;
312 kmsg->msg_controllen -= cmlen;
313 }
314 }
315 if (i < fdnum)
316 kmsg->msg_flags |= MSG_CTRUNC;
317
318 /*
319 * All of the files that fit in the message have had their
320 * usage counts incremented, so we just free the list.
321 */
322 __scm_destroy(scm);
323}
324
1da177e4
LT		 325/*
326 * A struct sock_filter is architecture independent.
327 */
328struct compat_sock_fprog {
329 u16 len;
330 compat_uptr_t filter; /* struct sock_filter * */
331};
332
3fdadf7d 333static int do_set_attach_filter(struct socket *sock, int level, int optname,
1da177e4
LT		 334 char __user *optval, int optlen)
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
DM		 353static int do_set_sock_timeout(struct socket *sock, int level,
354 int optname, char __user *optval, int optlen)
1da177e4
LT		 355{
356 struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
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);
3fdadf7d 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
DM		 375static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
376 char __user *optval, int optlen)
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
LT		 387asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
388 char __user *optval, int optlen)
389{
3fdadf7d
DM		 390 int err;
391 struct socket *sock;
392
3fdadf7d
DM		 393 if (optlen < 0)
394 return -EINVAL;
395
396 if ((sock = sockfd_lookup(fd, &err))!=NULL)
397 {
398 err = security_socket_setsockopt(sock,level,optname);
399 if (err) {
400 sockfd_put(sock);
401 return err;
402 }
403
404 if (level == SOL_SOCKET)
405 err = compat_sock_setsockopt(sock, level,
406 optname, optval, optlen);
407 else if (sock->ops->compat_setsockopt)
408 err = sock->ops->compat_setsockopt(sock, level,
409 optname, optval, optlen);
410 else
411 err = sock->ops->setsockopt(sock, level,
412 optname, optval, optlen);
413 sockfd_put(sock);
414 }
415 return err;
1da177e4
LT		 416}
417
3fdadf7d 418static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4
LT		 419 char __user *optval, int __user *optlen)
420{
421 struct compat_timeval __user *up;
422 struct timeval ktime;
423 mm_segment_t old_fs;
424 int len, err;
425
426 up = (struct compat_timeval __user *) optval;
427 if (get_user(len, optlen))
428 return -EFAULT;
429 if (len < sizeof(*up))
430 return -EINVAL;
431 len = sizeof(ktime);
432 old_fs = get_fs();
433 set_fs(KERNEL_DS);
3fdadf7d 434 err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4
LT		 435 set_fs(old_fs);
436
437 if (!err) {
438 if (put_user(sizeof(*up), optlen) ||
439 !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
440 __put_user(ktime.tv_sec, &up->tv_sec) ||
441 __put_user(ktime.tv_usec, &up->tv_usec))
442 err = -EFAULT;
443 }
444 return err;
445}
446
3fdadf7d 447static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4
LT		 448 char __user *optval, int __user *optlen)
449{
3fdadf7d
DM		 450 if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
451 return do_get_sock_timeout(sock, level, optname, optval, optlen);
452 return sock_getsockopt(sock, level, optname, optval, optlen);
1da177e4
LT		 453}
454
f0ac2614
SP		 455int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
456{
457 struct compat_timeval __user *ctv =
458 (struct compat_timeval __user*) userstamp;
459 int err = -ENOENT;
b7aa0bf7 460 struct timeval tv;
f0ac2614
SP		 461
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{
481 struct compat_timespec __user *ctv =
482 (struct compat_timespec __user*) userstamp;
483 int err = -ENOENT;
484 struct timespec ts;
485
486 if (!sock_flag(sk, SOCK_TIMESTAMP))
20d49473 487 sock_enable_timestamp(sk, SOCK_TIMESTAMP);
ae40eb1e
ED		 488 ts = ktime_to_timespec(sk->sk_stamp);
489 if (ts.tv_sec == -1)
490 return err;
491 if (ts.tv_sec == 0) {
492 sk->sk_stamp = ktime_get_real();
493 ts = ktime_to_timespec(sk->sk_stamp);
494 }
495 err = 0;
496 if (put_user(ts.tv_sec, &ctv->tv_sec) ||
497 put_user(ts.tv_nsec, &ctv->tv_nsec))
498 err = -EFAULT;
499 return err;
500}
501EXPORT_SYMBOL(compat_sock_get_timestampns);
502
3fdadf7d
DM		 503asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
504 char __user *optval, int __user *optlen)
505{
506 int err;
507 struct socket *sock;
508
509 if ((sock = sockfd_lookup(fd, &err))!=NULL)
510 {
511 err = security_socket_getsockopt(sock, level,
512 optname);
513 if (err) {
514 sockfd_put(sock);
515 return err;
516 }
517
518 if (level == SOL_SOCKET)
519 err = compat_sock_getsockopt(sock, level,
520 optname, optval, optlen);
521 else if (sock->ops->compat_getsockopt)
522 err = sock->ops->compat_getsockopt(sock, level,
523 optname, optval, optlen);
524 else
525 err = sock->ops->getsockopt(sock, level,
526 optname, optval, optlen);
527 sockfd_put(sock);
528 }
529 return err;
530}
dae50295
DS		 531
532struct compat_group_req {
533 __u32 gr_interface;
534 struct __kernel_sockaddr_storage gr_group
535 __attribute__ ((aligned(4)));
536} __attribute__ ((packed));
537
538struct compat_group_source_req {
539 __u32 gsr_interface;
540 struct __kernel_sockaddr_storage gsr_group
541 __attribute__ ((aligned(4)));
542 struct __kernel_sockaddr_storage gsr_source
543 __attribute__ ((aligned(4)));
544} __attribute__ ((packed));
545
546struct compat_group_filter {
547 __u32 gf_interface;
548 struct __kernel_sockaddr_storage gf_group
549 __attribute__ ((aligned(4)));
550 __u32 gf_fmode;
551 __u32 gf_numsrc;
552 struct __kernel_sockaddr_storage gf_slist[1]
553 __attribute__ ((aligned(4)));
554} __attribute__ ((packed));
555
be666e0a
DS		 556#define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
557 sizeof(struct __kernel_sockaddr_storage))
558
dae50295
DS		 559
560int compat_mc_setsockopt(struct sock *sock, int level, int optname,
561 char __user *optval, int optlen,
562 int (*setsockopt)(struct sock *,int,int,char __user *,int))
563{
564 char __user *koptval = optval;
565 int koptlen = optlen;
566
567 switch (optname) {
568 case MCAST_JOIN_GROUP:
569 case MCAST_LEAVE_GROUP:
570 {
571 struct compat_group_req __user *gr32 = (void *)optval;
572 struct group_req __user *kgr =
573 compat_alloc_user_space(sizeof(struct group_req));
574 u32 interface;
575
576 if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
577 !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
578 __get_user(interface, &gr32->gr_interface) ||
579 __put_user(interface, &kgr->gr_interface) ||
580 copy_in_user(&kgr->gr_group, &gr32->gr_group,
581 sizeof(kgr->gr_group)))
582 return -EFAULT;
583 koptval = (char __user *)kgr;
584 koptlen = sizeof(struct group_req);
585 break;
586 }
587 case MCAST_JOIN_SOURCE_GROUP:
588 case MCAST_LEAVE_SOURCE_GROUP:
589 case MCAST_BLOCK_SOURCE:
590 case MCAST_UNBLOCK_SOURCE:
591 {
592 struct compat_group_source_req __user *gsr32 = (void *)optval;
be666e0a 593 struct group_source_req __user *kgsr = compat_alloc_user_space(
dae50295
DS		 594 sizeof(struct group_source_req));
595 u32 interface;
596
597 if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
598 !access_ok(VERIFY_WRITE, kgsr,
599 sizeof(struct group_source_req)) ||
600 __get_user(interface, &gsr32->gsr_interface) ||
601 __put_user(interface, &kgsr->gsr_interface) ||
602 copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
603 sizeof(kgsr->gsr_group)) ||
604 copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
605 sizeof(kgsr->gsr_source)))
606 return -EFAULT;
607 koptval = (char __user *)kgsr;
608 koptlen = sizeof(struct group_source_req);
609 break;
610 }
611 case MCAST_MSFILTER:
612 {
613 struct compat_group_filter __user *gf32 = (void *)optval;
be666e0a 614 struct group_filter __user *kgf;
dae50295
DS		 615 u32 interface, fmode, numsrc;
616
be666e0a 617 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
dae50295
DS		 618 __get_user(interface, &gf32->gf_interface) ||
619 __get_user(fmode, &gf32->gf_fmode) ||
620 __get_user(numsrc, &gf32->gf_numsrc))
621 return -EFAULT;
622 koptlen = optlen + sizeof(struct group_filter) -
623 sizeof(struct compat_group_filter);
624 if (koptlen < GROUP_FILTER_SIZE(numsrc))
625 return -EINVAL;
626 kgf = compat_alloc_user_space(koptlen);
627 if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
628 __put_user(interface, &kgf->gf_interface) ||
629 __put_user(fmode, &kgf->gf_fmode) ||
630 __put_user(numsrc, &kgf->gf_numsrc) ||
631 copy_in_user(&kgf->gf_group, &gf32->gf_group,
632 sizeof(kgf->gf_group)) ||
be666e0a 633 (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,
dae50295
DS		 634 numsrc * sizeof(kgf->gf_slist[0]))))
635 return -EFAULT;
636 koptval = (char __user *)kgf;
637 break;
638 }
639
640 default:
641 break;
642 }
643 return setsockopt(sock, level, optname, koptval, koptlen);
644}
645
646EXPORT_SYMBOL(compat_mc_setsockopt);
647
42908c69
DS		 648int compat_mc_getsockopt(struct sock *sock, int level, int optname,
649 char __user *optval, int __user *optlen,
650 int (*getsockopt)(struct sock *,int,int,char __user *,int __user *))
651{
652 struct compat_group_filter __user *gf32 = (void *)optval;
653 struct group_filter __user *kgf;
654 int __user *koptlen;
655 u32 interface, fmode, numsrc;
656 int klen, ulen, err;
657
658 if (optname != MCAST_MSFILTER)
659 return getsockopt(sock, level, optname, optval, optlen);
660
661 koptlen = compat_alloc_user_space(sizeof(*koptlen));
662 if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
663 __get_user(ulen, optlen))
664 return -EFAULT;
665
666 /* adjust len for pad */
667 klen = ulen + sizeof(*kgf) - sizeof(*gf32);
668
669 if (klen < GROUP_FILTER_SIZE(0))
670 return -EINVAL;
671
672 if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
673 __put_user(klen, koptlen))
674 return -EFAULT;
675
676 /* have to allow space for previous compat_alloc_user_space, too */
677 kgf = compat_alloc_user_space(klen+sizeof(*optlen));
678
679 if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
680 __get_user(interface, &gf32->gf_interface) ||
681 __get_user(fmode, &gf32->gf_fmode) ||
682 __get_user(numsrc, &gf32->gf_numsrc) ||
683 __put_user(interface, &kgf->gf_interface) ||
684 __put_user(fmode, &kgf->gf_fmode) ||
685 __put_user(numsrc, &kgf->gf_numsrc) ||
686 copy_in_user(&kgf->gf_group,&gf32->gf_group,sizeof(kgf->gf_group)))
687 return -EFAULT;
688
689 err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
690 if (err)
691 return err;
692
693 if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
694 __get_user(klen, koptlen))
695 return -EFAULT;
696
697 ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
698
699 if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
700 __put_user(ulen, optlen))
701 return -EFAULT;
702
703 if (!access_ok(VERIFY_READ, kgf, klen) ||
704 !access_ok(VERIFY_WRITE, gf32, ulen) ||
705 __get_user(interface, &kgf->gf_interface) ||
706 __get_user(fmode, &kgf->gf_fmode) ||
707 __get_user(numsrc, &kgf->gf_numsrc) ||
708 __put_user(interface, &gf32->gf_interface) ||
709 __put_user(fmode, &gf32->gf_fmode) ||
710 __put_user(numsrc, &gf32->gf_numsrc))
711 return -EFAULT;
712 if (numsrc) {
713 int copylen;
714
715 klen -= GROUP_FILTER_SIZE(0);
716 copylen = numsrc * sizeof(gf32->gf_slist[0]);
717 if (copylen > klen)
718 copylen = klen;
719 if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
720 return -EFAULT;
721 }
722 return err;
723}
724
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))
aaca0bdc 730static unsigned char nas[19]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
1da177e4 731 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
aaca0bdc 732 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
de11defe 733 AL(4)};
1da177e4
LT		 734#undef AL
735
736asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
737{
738 return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
739}
740
741asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
742{
743 return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
744}
745
746asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
747{
748 int ret;
749 u32 a[6];
750 u32 a0, a1;
4768fbcb 751
de11defe 752 if (call < SYS_SOCKET || call > SYS_ACCEPT4)
1da177e4
LT		 753 return -EINVAL;
754 if (copy_from_user(a, args, nas[call]))
755 return -EFAULT;
756 a0 = a[0];
757 a1 = a[1];
4768fbcb 758
e71a4783 759 switch (call) {
1da177e4
LT		 760 case SYS_SOCKET:
761 ret = sys_socket(a0, a1, a[2]);
762 break;
763 case SYS_BIND:
764 ret = sys_bind(a0, compat_ptr(a1), a[2]);
765 break;
766 case SYS_CONNECT:
767 ret = sys_connect(a0, compat_ptr(a1), a[2]);
768 break;
769 case SYS_LISTEN:
770 ret = sys_listen(a0, a1);
771 break;
772 case SYS_ACCEPT:
de11defe 773 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);
1da177e4
LT		 774 break;
775 case SYS_GETSOCKNAME:
776 ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
777 break;
778 case SYS_GETPEERNAME:
779 ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
780 break;
781 case SYS_SOCKETPAIR:
782 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
783 break;
784 case SYS_SEND:
785 ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
786 break;
787 case SYS_SENDTO:
788 ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
789 break;
790 case SYS_RECV:
791 ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
792 break;
793 case SYS_RECVFROM:
794 ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
795 break;
796 case SYS_SHUTDOWN:
797 ret = sys_shutdown(a0,a1);
798 break;
799 case SYS_SETSOCKOPT:
800 ret = compat_sys_setsockopt(a0, a1, a[2],
801 compat_ptr(a[3]), a[4]);
802 break;
803 case SYS_GETSOCKOPT:
804 ret = compat_sys_getsockopt(a0, a1, a[2],
805 compat_ptr(a[3]), compat_ptr(a[4]));
806 break;
807 case SYS_SENDMSG:
808 ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
809 break;
810 case SYS_RECVMSG:
811 ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
812 break;
de11defe
UD		 813 case SYS_ACCEPT4:
814 ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);
aaca0bdc 815 break;
1da177e4
LT		 816 default:
817 ret = -EINVAL;
818 break;
819 }
820 return ret;
821}
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