xref: /openbmc/linux/net/compat.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 	kmsg->msg_control += cmlen;
258 	kmsg->msg_controllen -= cmlen;
259 	return 0;
260 }
261 
262 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
263 {
264 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
265 	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
266 	int fdnum = scm->fp->count;
267 	struct file **fp = scm->fp->fp;
268 	int __user *cmfptr;
269 	int err = 0, i;
270 
271 	if (fdnum < fdmax)
272 		fdmax = fdnum;
273 
274 	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
275 		int new_fd;
276 		err = security_file_receive(fp[i]);
277 		if (err)
278 			break;
279 		err = get_unused_fd();
280 		if (err < 0)
281 			break;
282 		new_fd = err;
283 		err = put_user(new_fd, cmfptr);
284 		if (err) {
285 			put_unused_fd(new_fd);
286 			break;
287 		}
288 		/* Bump the usage count and install the file. */
289 		get_file(fp[i]);
290 		fd_install(new_fd, fp[i]);
291 	}
292 
293 	if (i > 0) {
294 		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
295 		err = put_user(SOL_SOCKET, &cm->cmsg_level);
296 		if (!err)
297 			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
298 		if (!err)
299 			err = put_user(cmlen, &cm->cmsg_len);
300 		if (!err) {
301 			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
302 			kmsg->msg_control += cmlen;
303 			kmsg->msg_controllen -= cmlen;
304 		}
305 	}
306 	if (i < fdnum)
307 		kmsg->msg_flags |= MSG_CTRUNC;
308 
309 	/*
310 	 * All of the files that fit in the message have had their
311 	 * usage counts incremented, so we just free the list.
312 	 */
313 	__scm_destroy(scm);
314 }
315 
316 /*
317  * For now, we assume that the compatibility and native version
318  * of struct ipt_entry are the same - sfr.  FIXME
319  */
320 struct compat_ipt_replace {
321 	char			name[IPT_TABLE_MAXNAMELEN];
322 	u32			valid_hooks;
323 	u32			num_entries;
324 	u32			size;
325 	u32			hook_entry[NF_IP_NUMHOOKS];
326 	u32			underflow[NF_IP_NUMHOOKS];
327 	u32			num_counters;
328 	compat_uptr_t		counters;	/* struct ipt_counters * */
329 	struct ipt_entry	entries[0];
330 };
331 
332 static int do_netfilter_replace(int fd, int level, int optname,
333 				char __user *optval, int optlen)
334 {
335 	struct compat_ipt_replace __user *urepl;
336 	struct ipt_replace __user *repl_nat;
337 	char name[IPT_TABLE_MAXNAMELEN];
338 	u32 origsize, tmp32, num_counters;
339 	unsigned int repl_nat_size;
340 	int ret;
341 	int i;
342 	compat_uptr_t ucntrs;
343 
344 	urepl = (struct compat_ipt_replace __user *)optval;
345 	if (get_user(origsize, &urepl->size))
346 		return -EFAULT;
347 
348 	/* Hack: Causes ipchains to give correct error msg --RR */
349 	if (optlen != sizeof(*urepl) + origsize)
350 		return -ENOPROTOOPT;
351 
352 	/* XXX Assumes that size of ipt_entry is the same both in
353 	 *     native and compat environments.
354 	 */
355 	repl_nat_size = sizeof(*repl_nat) + origsize;
356 	repl_nat = compat_alloc_user_space(repl_nat_size);
357 
358 	ret = -EFAULT;
359 	if (put_user(origsize, &repl_nat->size))
360 		goto out;
361 
362 	if (!access_ok(VERIFY_READ, urepl, optlen) ||
363 	    !access_ok(VERIFY_WRITE, repl_nat, optlen))
364 		goto out;
365 
366 	if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
367 	    __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
368 		goto out;
369 
370 	if (__get_user(tmp32, &urepl->valid_hooks) ||
371 	    __put_user(tmp32, &repl_nat->valid_hooks))
372 		goto out;
373 
374 	if (__get_user(tmp32, &urepl->num_entries) ||
375 	    __put_user(tmp32, &repl_nat->num_entries))
376 		goto out;
377 
378 	if (__get_user(num_counters, &urepl->num_counters) ||
379 	    __put_user(num_counters, &repl_nat->num_counters))
380 		goto out;
381 
382 	if (__get_user(ucntrs, &urepl->counters) ||
383 	    __put_user(compat_ptr(ucntrs), &repl_nat->counters))
384 		goto out;
385 
386 	if (__copy_in_user(&repl_nat->entries[0],
387 			   &urepl->entries[0],
388 			   origsize))
389 		goto out;
390 
391 	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
392 		if (__get_user(tmp32, &urepl->hook_entry[i]) ||
393 		    __put_user(tmp32, &repl_nat->hook_entry[i]) ||
394 		    __get_user(tmp32, &urepl->underflow[i]) ||
395 		    __put_user(tmp32, &repl_nat->underflow[i]))
396 			goto out;
397 	}
398 
399 	/*
400 	 * Since struct ipt_counters just contains two u_int64_t members
401 	 * we can just do the access_ok check here and pass the (converted)
402 	 * pointer into the standard syscall.  We hope that the pointer is
403 	 * not misaligned ...
404 	 */
405 	if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
406 		       num_counters * sizeof(struct ipt_counters)))
407 		goto out;
408 
409 
410 	ret = sys_setsockopt(fd, level, optname,
411 			     (char __user *)repl_nat, repl_nat_size);
412 
413 out:
414 	return ret;
415 }
416 
417 /*
418  * A struct sock_filter is architecture independent.
419  */
420 struct compat_sock_fprog {
421 	u16		len;
422 	compat_uptr_t	filter;		/* struct sock_filter * */
423 };
424 
425 static int do_set_attach_filter(struct socket *sock, int level, int optname,
426 				char __user *optval, int optlen)
427 {
428 	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
429 	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
430 	compat_uptr_t ptr;
431 	u16 len;
432 
433 	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
434 	    !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
435 	    __get_user(len, &fprog32->len) ||
436 	    __get_user(ptr, &fprog32->filter) ||
437 	    __put_user(len, &kfprog->len) ||
438 	    __put_user(compat_ptr(ptr), &kfprog->filter))
439 		return -EFAULT;
440 
441 	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
442 			      sizeof(struct sock_fprog));
443 }
444 
445 static int do_set_sock_timeout(struct socket *sock, int level,
446 		int optname, char __user *optval, int optlen)
447 {
448 	struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
449 	struct timeval ktime;
450 	mm_segment_t old_fs;
451 	int err;
452 
453 	if (optlen < sizeof(*up))
454 		return -EINVAL;
455 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
456 	    __get_user(ktime.tv_sec, &up->tv_sec) ||
457 	    __get_user(ktime.tv_usec, &up->tv_usec))
458 		return -EFAULT;
459 	old_fs = get_fs();
460 	set_fs(KERNEL_DS);
461 	err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
462 	set_fs(old_fs);
463 
464 	return err;
465 }
466 
467 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
468 				char __user *optval, int optlen)
469 {
470 	if (optname == SO_ATTACH_FILTER)
471 		return do_set_attach_filter(sock, level, optname,
472 					    optval, optlen);
473 	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
474 		return do_set_sock_timeout(sock, level, optname, optval, optlen);
475 
476 	return sock_setsockopt(sock, level, optname, optval, optlen);
477 }
478 
479 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
480 				char __user *optval, int optlen)
481 {
482 	int err;
483 	struct socket *sock;
484 
485 	if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
486 		return do_netfilter_replace(fd, level, optname,
487 					    optval, optlen);
488 
489 	if (optlen < 0)
490 		return -EINVAL;
491 
492 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
493 	{
494 		err = security_socket_setsockopt(sock,level,optname);
495 		if (err) {
496 			sockfd_put(sock);
497 			return err;
498 		}
499 
500 		if (level == SOL_SOCKET)
501 			err = compat_sock_setsockopt(sock, level,
502 					optname, optval, optlen);
503 		else if (sock->ops->compat_setsockopt)
504 			err = sock->ops->compat_setsockopt(sock, level,
505 					optname, optval, optlen);
506 		else
507 			err = sock->ops->setsockopt(sock, level,
508 					optname, optval, optlen);
509 		sockfd_put(sock);
510 	}
511 	return err;
512 }
513 
514 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
515 		char __user *optval, int __user *optlen)
516 {
517 	struct compat_timeval __user *up;
518 	struct timeval ktime;
519 	mm_segment_t old_fs;
520 	int len, err;
521 
522 	up = (struct compat_timeval __user *) optval;
523 	if (get_user(len, optlen))
524 		return -EFAULT;
525 	if (len < sizeof(*up))
526 		return -EINVAL;
527 	len = sizeof(ktime);
528 	old_fs = get_fs();
529 	set_fs(KERNEL_DS);
530 	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
531 	set_fs(old_fs);
532 
533 	if (!err) {
534 		if (put_user(sizeof(*up), optlen) ||
535 		    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
536 		    __put_user(ktime.tv_sec, &up->tv_sec) ||
537 		    __put_user(ktime.tv_usec, &up->tv_usec))
538 			err = -EFAULT;
539 	}
540 	return err;
541 }
542 
543 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
544 				char __user *optval, int __user *optlen)
545 {
546 	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
547 		return do_get_sock_timeout(sock, level, optname, optval, optlen);
548 	return sock_getsockopt(sock, level, optname, optval, optlen);
549 }
550 
551 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
552 {
553 	struct compat_timeval __user *ctv =
554 			(struct compat_timeval __user*) userstamp;
555 	int err = -ENOENT;
556 	struct timeval tv;
557 
558 	if (!sock_flag(sk, SOCK_TIMESTAMP))
559 		sock_enable_timestamp(sk);
560 	tv = ktime_to_timeval(sk->sk_stamp);
561 	if (tv.tv_sec == -1)
562 		return err;
563 	if (tv.tv_sec == 0) {
564 		sk->sk_stamp = ktime_get_real();
565 		tv = ktime_to_timeval(sk->sk_stamp);
566 	}
567 	err = 0;
568 	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
569 			put_user(tv.tv_usec, &ctv->tv_usec))
570 		err = -EFAULT;
571 	return err;
572 }
573 EXPORT_SYMBOL(compat_sock_get_timestamp);
574 
575 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
576 {
577 	struct compat_timespec __user *ctv =
578 			(struct compat_timespec __user*) userstamp;
579 	int err = -ENOENT;
580 	struct timespec ts;
581 
582 	if (!sock_flag(sk, SOCK_TIMESTAMP))
583 		sock_enable_timestamp(sk);
584 	ts = ktime_to_timespec(sk->sk_stamp);
585 	if (ts.tv_sec == -1)
586 		return err;
587 	if (ts.tv_sec == 0) {
588 		sk->sk_stamp = ktime_get_real();
589 		ts = ktime_to_timespec(sk->sk_stamp);
590 	}
591 	err = 0;
592 	if (put_user(ts.tv_sec, &ctv->tv_sec) ||
593 			put_user(ts.tv_nsec, &ctv->tv_nsec))
594 		err = -EFAULT;
595 	return err;
596 }
597 EXPORT_SYMBOL(compat_sock_get_timestampns);
598 
599 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
600 				char __user *optval, int __user *optlen)
601 {
602 	int err;
603 	struct socket *sock;
604 
605 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
606 	{
607 		err = security_socket_getsockopt(sock, level,
608 							   optname);
609 		if (err) {
610 			sockfd_put(sock);
611 			return err;
612 		}
613 
614 		if (level == SOL_SOCKET)
615 			err = compat_sock_getsockopt(sock, level,
616 					optname, optval, optlen);
617 		else if (sock->ops->compat_getsockopt)
618 			err = sock->ops->compat_getsockopt(sock, level,
619 					optname, optval, optlen);
620 		else
621 			err = sock->ops->getsockopt(sock, level,
622 					optname, optval, optlen);
623 		sockfd_put(sock);
624 	}
625 	return err;
626 }
627 /* Argument list sizes for compat_sys_socketcall */
628 #define AL(x) ((x) * sizeof(u32))
629 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
630 				AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
631 				AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
632 #undef AL
633 
634 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
635 {
636 	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
637 }
638 
639 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
640 {
641 	return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
642 }
643 
644 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
645 {
646 	int ret;
647 	u32 a[6];
648 	u32 a0, a1;
649 
650 	if (call < SYS_SOCKET || call > SYS_RECVMSG)
651 		return -EINVAL;
652 	if (copy_from_user(a, args, nas[call]))
653 		return -EFAULT;
654 	a0 = a[0];
655 	a1 = a[1];
656 
657 	switch (call) {
658 	case SYS_SOCKET:
659 		ret = sys_socket(a0, a1, a[2]);
660 		break;
661 	case SYS_BIND:
662 		ret = sys_bind(a0, compat_ptr(a1), a[2]);
663 		break;
664 	case SYS_CONNECT:
665 		ret = sys_connect(a0, compat_ptr(a1), a[2]);
666 		break;
667 	case SYS_LISTEN:
668 		ret = sys_listen(a0, a1);
669 		break;
670 	case SYS_ACCEPT:
671 		ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
672 		break;
673 	case SYS_GETSOCKNAME:
674 		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
675 		break;
676 	case SYS_GETPEERNAME:
677 		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
678 		break;
679 	case SYS_SOCKETPAIR:
680 		ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
681 		break;
682 	case SYS_SEND:
683 		ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
684 		break;
685 	case SYS_SENDTO:
686 		ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
687 		break;
688 	case SYS_RECV:
689 		ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
690 		break;
691 	case SYS_RECVFROM:
692 		ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
693 		break;
694 	case SYS_SHUTDOWN:
695 		ret = sys_shutdown(a0,a1);
696 		break;
697 	case SYS_SETSOCKOPT:
698 		ret = compat_sys_setsockopt(a0, a1, a[2],
699 				compat_ptr(a[3]), a[4]);
700 		break;
701 	case SYS_GETSOCKOPT:
702 		ret = compat_sys_getsockopt(a0, a1, a[2],
703 				compat_ptr(a[3]), compat_ptr(a[4]));
704 		break;
705 	case SYS_SENDMSG:
706 		ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
707 		break;
708 	case SYS_RECVMSG:
709 		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
710 		break;
711 	default:
712 		ret = -EINVAL;
713 		break;
714 	}
715 	return ret;
716 }
717