net/compat.c - kernel/msm-5.4 - Gitiles

 /*
  * 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
  *
  * Copyright (C) 2000		VA Linux Co
  * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
  * Copyright (C) 1999 		Arun Sharma <arun.sharma@intel.com>
  * Copyright (C) 1997,1998 	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  * Copyright (C) 1997 		David S. Miller (davem@caip.rutgers.edu)
  * Copyright (C) 2000		Hewlett-Packard Co.
  * Copyright (C) 2000		David Mosberger-Tang <davidm@hpl.hp.com>
  * Copyright (C) 2000,2001	Andi Kleen, SuSE Labs
  */

 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/types.h>
 #include <linux/file.h>
 #include <linux/icmpv6.h>
 #include <linux/socket.h>
 #include <linux/syscalls.h>
 #include <linux/filter.h>
 #include <linux/compat.h>
 #include <linux/netfilter_ipv4/ip_tables.h>
 #include <linux/security.h>

 #include <net/scm.h>
 #include <net/sock.h>
 #include <asm/uaccess.h>
 #include <net/compat.h>

 static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
 					  struct compat_iovec __user *uiov32,
 					  int niov)
 {
 	int tot_len = 0;

 	while(niov > 0) {
 		compat_uptr_t buf;
 		compat_size_t len;

 		if(get_user(len, &uiov32->iov_len) ||
 		   get_user(buf, &uiov32->iov_base)) {
 			tot_len = -EFAULT;
 			break;
 		}
 		tot_len += len;
 		kiov->iov_base = compat_ptr(buf);
 		kiov->iov_len = (__kernel_size_t) len;
 		uiov32++;
 		kiov++;
 		niov--;
 	}
 	return tot_len;
 }

 int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
 {
 	compat_uptr_t tmp1, tmp2, tmp3;

 	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
 	    __get_user(tmp1, &umsg->msg_name) ||
 	    __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
 	    __get_user(tmp2, &umsg->msg_iov) ||
 	    __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
 	    __get_user(tmp3, &umsg->msg_control) ||
 	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
 	    __get_user(kmsg->msg_flags, &umsg->msg_flags))
 		return -EFAULT;
 	kmsg->msg_name = compat_ptr(tmp1);
 	kmsg->msg_iov = compat_ptr(tmp2);
 	kmsg->msg_control = compat_ptr(tmp3);
 	return 0;
 }

 /* I've named the args so it is easy to tell whose space the pointers are in. */
 int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
 		   char *kern_address, int mode)
 {
 	int tot_len;

 	if(kern_msg->msg_namelen) {
 		if(mode==VERIFY_READ) {
 			int err = move_addr_to_kernel(kern_msg->msg_name,
 						      kern_msg->msg_namelen,
 						      kern_address);
 			if(err < 0)
 				return err;
 		}
 		kern_msg->msg_name = kern_address;
 	} else
 		kern_msg->msg_name = NULL;

 	tot_len = iov_from_user_compat_to_kern(kern_iov,
 					  (struct compat_iovec __user *)kern_msg->msg_iov,
 					  kern_msg->msg_iovlen);
 	if(tot_len >= 0)
 		kern_msg->msg_iov = kern_iov;

 	return tot_len;
 }

 /* Bleech... */
 #define CMSG_COMPAT_ALIGN(len)	ALIGN((len), sizeof(s32))

 #define CMSG_COMPAT_DATA(cmsg)				\
 	((void __user *)((char __user *)(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
 #define CMSG_COMPAT_SPACE(len)				\
 	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
 #define CMSG_COMPAT_LEN(len)				\
 	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))

 #define CMSG_COMPAT_FIRSTHDR(msg)			\
 	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ?	\
 	 (struct compat_cmsghdr __user *)((msg)->msg_control) :		\
 	 (struct compat_cmsghdr __user *)NULL)

 #define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
 	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
 	 (ucmlen) <= (unsigned long) \
 	 ((mhdr)->msg_controllen - \
 	  ((char *)(ucmsg) - (char *)(mhdr)->msg_control)))

 static inline struct compat_cmsghdr __user *cmsg_compat_nxthdr(struct msghdr *msg,
 		struct compat_cmsghdr __user *cmsg, int cmsg_len)
 {
 	char __user *ptr = (char __user *)cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
 	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
 			msg->msg_controllen)
 		return NULL;
 	return (struct compat_cmsghdr __user *)ptr;
 }

 /* There is a lot of hair here because the alignment rules (and
  * thus placement) of cmsg headers and length are different for
  * 32-bit apps.  -DaveM
  */
 int cmsghdr_from_user_compat_to_kern(struct msghdr *kmsg, struct sock *sk,
 			       unsigned char *stackbuf, int stackbuf_size)
 {
 	struct compat_cmsghdr __user *ucmsg;
 	struct cmsghdr *kcmsg, *kcmsg_base;
 	compat_size_t ucmlen;
 	__kernel_size_t kcmlen, tmp;
 	int err = -EFAULT;

 	kcmlen = 0;
 	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 	while(ucmsg != NULL) {
 		if(get_user(ucmlen, &ucmsg->cmsg_len))
 			return -EFAULT;

 		/* Catch bogons. */
 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 			return -EINVAL;

 		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 		       CMSG_ALIGN(sizeof(struct cmsghdr)));
 		tmp = CMSG_ALIGN(tmp);
 		kcmlen += tmp;
 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 	}
 	if(kcmlen == 0)
 		return -EINVAL;

 	/* The kcmlen holds the 64-bit version of the control length.
 	 * It may not be modified as we do not stick it into the kmsg
 	 * until we have successfully copied over all of the data
 	 * from the user.
 	 */
 	if (kcmlen > stackbuf_size)
 		kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
 	if (kcmsg == NULL)
 		return -ENOBUFS;

 	/* Now copy them over neatly. */
 	memset(kcmsg, 0, kcmlen);
 	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
 	while(ucmsg != NULL) {
 		if (__get_user(ucmlen, &ucmsg->cmsg_len))
 			goto Efault;
 		if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
 			goto Einval;
 		tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
 		       CMSG_ALIGN(sizeof(struct cmsghdr)));
 		if ((char *)kcmsg_base + kcmlen - (char *)kcmsg < CMSG_ALIGN(tmp))
 			goto Einval;
 		kcmsg->cmsg_len = tmp;
 		tmp = CMSG_ALIGN(tmp);
 		if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) ||
 		    __get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) ||
 		    copy_from_user(CMSG_DATA(kcmsg),
 				   CMSG_COMPAT_DATA(ucmsg),
 				   (ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
 			goto Efault;

 		/* Advance. */
 		kcmsg = (struct cmsghdr *)((char *)kcmsg + tmp);
 		ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
 	}

 	/* Ok, looks like we made it.  Hook it up and return success. */
 	kmsg->msg_control = kcmsg_base;
 	kmsg->msg_controllen = kcmlen;
 	return 0;

 Einval:
 	err = -EINVAL;
 Efault:
 	if (kcmsg_base != (struct cmsghdr *)stackbuf)
 		sock_kfree_s(sk, kcmsg_base, kcmlen);
 	return err;
 }

 int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *data)
 {
 	struct compat_timeval ctv;
 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 	struct compat_cmsghdr cmhdr;
 	int cmlen;

 	if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
 		kmsg->msg_flags |= MSG_CTRUNC;
 		return 0; /* XXX: return error? check spec. */
 	}

 	if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
 		struct timeval *tv = (struct timeval *)data;
 		ctv.tv_sec = tv->tv_sec;
 		ctv.tv_usec = tv->tv_usec;
 		data = &ctv;
 		len = sizeof(struct compat_timeval);
 	}

 	cmlen = CMSG_COMPAT_LEN(len);
 	if(kmsg->msg_controllen < cmlen) {
 		kmsg->msg_flags |= MSG_CTRUNC;
 		cmlen = kmsg->msg_controllen;
 	}
 	cmhdr.cmsg_level = level;
 	cmhdr.cmsg_type = type;
 	cmhdr.cmsg_len = cmlen;

 	if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
 		return -EFAULT;
 	if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
 		return -EFAULT;
 	cmlen = CMSG_COMPAT_SPACE(len);
 	kmsg->msg_control += cmlen;
 	kmsg->msg_controllen -= cmlen;
 	return 0;
 }

 void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 {
 	struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control;
 	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
 	int fdnum = scm->fp->count;
 	struct file **fp = scm->fp->fp;
 	int __user *cmfptr;
 	int err = 0, i;

 	if (fdnum < fdmax)
 		fdmax = fdnum;

 	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
 		int new_fd;
 		err = security_file_receive(fp[i]);
 		if (err)
 			break;
 		err = get_unused_fd();
 		if (err < 0)
 			break;
 		new_fd = err;
 		err = put_user(new_fd, cmfptr);
 		if (err) {
 			put_unused_fd(new_fd);
 			break;
 		}
 		/* Bump the usage count and install the file. */
 		get_file(fp[i]);
 		fd_install(new_fd, fp[i]);
 	}

 	if (i > 0) {
 		int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
 		err = put_user(SOL_SOCKET, &cm->cmsg_level);
 		if (!err)
 			err = put_user(SCM_RIGHTS, &cm->cmsg_type);
 		if (!err)
 			err = put_user(cmlen, &cm->cmsg_len);
 		if (!err) {
 			cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
 			kmsg->msg_control += cmlen;
 			kmsg->msg_controllen -= cmlen;
 		}
 	}
 	if (i < fdnum)
 		kmsg->msg_flags |= MSG_CTRUNC;

 	/*
 	 * All of the files that fit in the message have had their
 	 * usage counts incremented, so we just free the list.
 	 */
 	__scm_destroy(scm);
 }

 /*
  * For now, we assume that the compatibility and native version
  * of struct ipt_entry are the same - sfr.  FIXME
  */
 struct compat_ipt_replace {
 	char			name[IPT_TABLE_MAXNAMELEN];
 	u32			valid_hooks;
 	u32			num_entries;
 	u32			size;
 	u32			hook_entry[NF_IP_NUMHOOKS];
 	u32			underflow[NF_IP_NUMHOOKS];
 	u32			num_counters;
 	compat_uptr_t		counters;	/* struct ipt_counters * */
 	struct ipt_entry	entries[0];
 };

 static int do_netfilter_replace(int fd, int level, int optname,
 				char __user *optval, int optlen)
 {
 	struct compat_ipt_replace __user *urepl;
 	struct ipt_replace __user *repl_nat;
 	char name[IPT_TABLE_MAXNAMELEN];
 	u32 origsize, tmp32, num_counters;
 	unsigned int repl_nat_size;
 	int ret;
 	int i;
 	compat_uptr_t ucntrs;

 	urepl = (struct compat_ipt_replace __user *)optval;
 	if (get_user(origsize, &urepl->size))
 		return -EFAULT;

 	/* Hack: Causes ipchains to give correct error msg --RR */
 	if (optlen != sizeof(*urepl) + origsize)
 		return -ENOPROTOOPT;

 	/* XXX Assumes that size of ipt_entry is the same both in
 	 *     native and compat environments.
 	 */
 	repl_nat_size = sizeof(*repl_nat) + origsize;
 	repl_nat = compat_alloc_user_space(repl_nat_size);

 	ret = -EFAULT;
 	if (put_user(origsize, &repl_nat->size))
 		goto out;

 	if (!access_ok(VERIFY_READ, urepl, optlen) ||
 	    !access_ok(VERIFY_WRITE, repl_nat, optlen))
 		goto out;

 	if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) ||
 	    __copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
 		goto out;

 	if (__get_user(tmp32, &urepl->valid_hooks) ||
 	    __put_user(tmp32, &repl_nat->valid_hooks))
 		goto out;

 	if (__get_user(tmp32, &urepl->num_entries) ||
 	    __put_user(tmp32, &repl_nat->num_entries))
 		goto out;

 	if (__get_user(num_counters, &urepl->num_counters) ||
 	    __put_user(num_counters, &repl_nat->num_counters))
 		goto out;

 	if (__get_user(ucntrs, &urepl->counters) ||
 	    __put_user(compat_ptr(ucntrs), &repl_nat->counters))
 		goto out;

 	if (__copy_in_user(&repl_nat->entries[0],
 			   &urepl->entries[0],
 			   origsize))
 		goto out;

 	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
 		if (__get_user(tmp32, &urepl->hook_entry[i]) ||
 		    __put_user(tmp32, &repl_nat->hook_entry[i]) ||
 		    __get_user(tmp32, &urepl->underflow[i]) ||
 		    __put_user(tmp32, &repl_nat->underflow[i]))
 			goto out;
 	}

 	/*
 	 * Since struct ipt_counters just contains two u_int64_t members
 	 * we can just do the access_ok check here and pass the (converted)
 	 * pointer into the standard syscall.  We hope that the pointer is
 	 * not misaligned ...
 	 */
 	if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
 		       num_counters * sizeof(struct ipt_counters)))
 		goto out;


 	ret = sys_setsockopt(fd, level, optname,
 			     (char __user *)repl_nat, repl_nat_size);

 out:
 	return ret;
 }

 /*
  * A struct sock_filter is architecture independent.
  */
 struct compat_sock_fprog {
 	u16		len;
 	compat_uptr_t	filter;		/* struct sock_filter * */
 };

 static int do_set_attach_filter(struct socket *sock, int level, int optname,
 				char __user *optval, int optlen)
 {
 	struct compat_sock_fprog __user *fprog32 = (struct compat_sock_fprog __user *)optval;
 	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
 	compat_uptr_t ptr;
 	u16 len;

 	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) ||
 	    !access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) ||
 	    __get_user(len, &fprog32->len) ||
 	    __get_user(ptr, &fprog32->filter) ||
 	    __put_user(len, &kfprog->len) ||
 	    __put_user(compat_ptr(ptr), &kfprog->filter))
 		return -EFAULT;

 	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
 			      sizeof(struct sock_fprog));
 }

 static int do_set_sock_timeout(struct socket *sock, int level,
 		int optname, char __user *optval, int optlen)
 {
 	struct compat_timeval __user *up = (struct compat_timeval __user *) optval;
 	struct timeval ktime;
 	mm_segment_t old_fs;
 	int err;

 	if (optlen < sizeof(*up))
 		return -EINVAL;
 	if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
 	    __get_user(ktime.tv_sec, &up->tv_sec) ||
 	    __get_user(ktime.tv_usec, &up->tv_usec))
 		return -EFAULT;
 	old_fs = get_fs();
 	set_fs(KERNEL_DS);
 	err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
 	set_fs(old_fs);

 	return err;
 }

 static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
 				char __user *optval, int optlen)
 {
 	if (optname == SO_ATTACH_FILTER)
 		return do_set_attach_filter(sock, level, optname,
 					    optval, optlen);
 	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 		return do_set_sock_timeout(sock, level, optname, optval, optlen);

 	return sock_setsockopt(sock, level, optname, optval, optlen);
 }

 asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
 				char __user *optval, int optlen)
 {
 	int err;
 	struct socket *sock;

 	if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
 		return do_netfilter_replace(fd, level, optname,
 					    optval, optlen);

 	if (optlen < 0)
 		return -EINVAL;

 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
 	{
 		err = security_socket_setsockopt(sock,level,optname);
 		if (err) {
 			sockfd_put(sock);
 			return err;
 		}

 		if (level == SOL_SOCKET)
 			err = compat_sock_setsockopt(sock, level,
 					optname, optval, optlen);
 		else if (sock->ops->compat_setsockopt)
 			err = sock->ops->compat_setsockopt(sock, level,
 					optname, optval, optlen);
 		else
 			err = sock->ops->setsockopt(sock, level,
 					optname, optval, optlen);
 		sockfd_put(sock);
 	}
 	return err;
 }

 static int do_get_sock_timeout(struct socket *sock, int level, int optname,
 		char __user *optval, int __user *optlen)
 {
 	struct compat_timeval __user *up;
 	struct timeval ktime;
 	mm_segment_t old_fs;
 	int len, err;

 	up = (struct compat_timeval __user *) optval;
 	if (get_user(len, optlen))
 		return -EFAULT;
 	if (len < sizeof(*up))
 		return -EINVAL;
 	len = sizeof(ktime);
 	old_fs = get_fs();
 	set_fs(KERNEL_DS);
 	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
 	set_fs(old_fs);

 	if (!err) {
 		if (put_user(sizeof(*up), optlen) ||
 		    !access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
 		    __put_user(ktime.tv_sec, &up->tv_sec) ||
 		    __put_user(ktime.tv_usec, &up->tv_usec))
 			err = -EFAULT;
 	}
 	return err;
 }

 static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
 				char __user *optval, int __user *optlen)
 {
 	if (optname == SO_RCVTIMEO || optname == SO_SNDTIMEO)
 		return do_get_sock_timeout(sock, level, optname, optval, optlen);
 	return sock_getsockopt(sock, level, optname, optval, optlen);
 }

 int compat_sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 {
 	struct compat_timeval __user *ctv =
 			(struct compat_timeval __user*) userstamp;
 	int err = -ENOENT;
 	struct timeval tv;

 	if (!sock_flag(sk, SOCK_TIMESTAMP))
 		sock_enable_timestamp(sk);
 	tv = ktime_to_timeval(sk->sk_stamp);
 	if (tv.tv_sec == -1)
 		return err;
 	if (tv.tv_sec == 0) {
 		sk->sk_stamp = ktime_get_real();
 		tv = ktime_to_timeval(sk->sk_stamp);
 	}
 	err = 0;
 	if (put_user(tv.tv_sec, &ctv->tv_sec) ||
 			put_user(tv.tv_usec, &ctv->tv_usec))
 		err = -EFAULT;
 	return err;
 }
 EXPORT_SYMBOL(compat_sock_get_timestamp);

 int compat_sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
 {
 	struct compat_timespec __user *ctv =
 			(struct compat_timespec __user*) userstamp;
 	int err = -ENOENT;
 	struct timespec ts;

 	if (!sock_flag(sk, SOCK_TIMESTAMP))
 		sock_enable_timestamp(sk);
 	ts = ktime_to_timespec(sk->sk_stamp);
 	if (ts.tv_sec == -1)
 		return err;
 	if (ts.tv_sec == 0) {
 		sk->sk_stamp = ktime_get_real();
 		ts = ktime_to_timespec(sk->sk_stamp);
 	}
 	err = 0;
 	if (put_user(ts.tv_sec, &ctv->tv_sec) ||
 			put_user(ts.tv_nsec, &ctv->tv_nsec))
 		err = -EFAULT;
 	return err;
 }
 EXPORT_SYMBOL(compat_sock_get_timestampns);

 asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
 				char __user *optval, int __user *optlen)
 {
 	int err;
 	struct socket *sock;

 	if ((sock = sockfd_lookup(fd, &err))!=NULL)
 	{
 		err = security_socket_getsockopt(sock, level,
 							   optname);
 		if (err) {
 			sockfd_put(sock);
 			return err;
 		}

 		if (level == SOL_SOCKET)
 			err = compat_sock_getsockopt(sock, level,
 					optname, optval, optlen);
 		else if (sock->ops->compat_getsockopt)
 			err = sock->ops->compat_getsockopt(sock, level,
 					optname, optval, optlen);
 		else
 			err = sock->ops->getsockopt(sock, level,
 					optname, optval, optlen);
 		sockfd_put(sock);
 	}
 	return err;
 }
 /* Argument list sizes for compat_sys_socketcall */
 #define AL(x) ((x) * sizeof(u32))
 static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 				AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
 				AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
 #undef AL

 asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
 {
 	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 }

 asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
 {
 	return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
 }

 asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
 {
 	int ret;
 	u32 a[6];
 	u32 a0, a1;

 	if (call < SYS_SOCKET || call > SYS_RECVMSG)
 		return -EINVAL;
 	if (copy_from_user(a, args, nas[call]))
 		return -EFAULT;
 	a0 = a[0];
 	a1 = a[1];

 	switch(call) {
 	case SYS_SOCKET:
 		ret = sys_socket(a0, a1, a[2]);
 		break;
 	case SYS_BIND:
 		ret = sys_bind(a0, compat_ptr(a1), a[2]);
 		break;
 	case SYS_CONNECT:
 		ret = sys_connect(a0, compat_ptr(a1), a[2]);
 		break;
 	case SYS_LISTEN:
 		ret = sys_listen(a0, a1);
 		break;
 	case SYS_ACCEPT:
 		ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
 		break;
 	case SYS_GETSOCKNAME:
 		ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
 		break;
 	case SYS_GETPEERNAME:
 		ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
 		break;
 	case SYS_SOCKETPAIR:
 		ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
 		break;
 	case SYS_SEND:
 		ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
 		break;
 	case SYS_SENDTO:
 		ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
 		break;
 	case SYS_RECV:
 		ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
 		break;
 	case SYS_RECVFROM:
 		ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
 		break;
 	case SYS_SHUTDOWN:
 		ret = sys_shutdown(a0,a1);
 		break;
 	case SYS_SETSOCKOPT:
 		ret = compat_sys_setsockopt(a0, a1, a[2],
 				compat_ptr(a[3]), a[4]);
 		break;
 	case SYS_GETSOCKOPT:
 		ret = compat_sys_getsockopt(a0, a1, a[2],
 				compat_ptr(a[3]), compat_ptr(a[4]));
 		break;
 	case SYS_SENDMSG:
 		ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
 		break;
 	case SYS_RECVMSG:
 		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }
	/*
	* 32bit Socket syscall emulation. Based on arch/sparc64/kernel/sys_sparc32.c.
	*
	* Copyright (C) 2000 VA Linux Co
	* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
	* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 2000 Hewlett-Packard Co.
	* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
	* Copyright (C) 2000,2001 Andi Kleen, SuSE Labs
	*/

	#include <linux/kernel.h>
	#include <linux/fs.h>
	#include <linux/types.h>
	#include <linux/file.h>
	#include <linux/icmpv6.h>
	#include <linux/socket.h>
	#include <linux/syscalls.h>
	#include <linux/filter.h>
	#include <linux/compat.h>
	#include <linux/netfilter_ipv4/ip_tables.h>
	#include <linux/security.h>

	#include <net/scm.h>
	#include <net/sock.h>
	#include <asm/uaccess.h>
	#include <net/compat.h>

	static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
	struct compat_iovec __user *uiov32,
	int niov)
	{
	int tot_len = 0;

	while(niov > 0) {
	compat_uptr_t buf;
	compat_size_t len;

	if(get_user(len, &uiov32->iov_len) \|\|
	get_user(buf, &uiov32->iov_base)) {
	tot_len = -EFAULT;
	break;
	}
	tot_len += len;
	kiov->iov_base = compat_ptr(buf);
	kiov->iov_len = (__kernel_size_t) len;
	uiov32++;
	kiov++;
	niov--;
	}
	return tot_len;
	}

	int get_compat_msghdr(struct msghdr kmsg, struct compat_msghdr __user umsg)
	{
	compat_uptr_t tmp1, tmp2, tmp3;

	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) \|\|
	__get_user(tmp1, &umsg->msg_name) \|\|
	__get_user(kmsg->msg_namelen, &umsg->msg_namelen) \|\|
	__get_user(tmp2, &umsg->msg_iov) \|\|
	__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) \|\|
	__get_user(tmp3, &umsg->msg_control) \|\|
	__get_user(kmsg->msg_controllen, &umsg->msg_controllen) \|\|
	__get_user(kmsg->msg_flags, &umsg->msg_flags))
	return -EFAULT;
	kmsg->msg_name = compat_ptr(tmp1);
	kmsg->msg_iov = compat_ptr(tmp2);
	kmsg->msg_control = compat_ptr(tmp3);
	return 0;
	}

	/* I've named the args so it is easy to tell whose space the pointers are in. */
	int verify_compat_iovec(struct msghdr kern_msg, struct iovec kern_iov,
	char *kern_address, int mode)
	{
	int tot_len;

	if(kern_msg->msg_namelen) {
	if(mode==VERIFY_READ) {
	int err = move_addr_to_kernel(kern_msg->msg_name,
	kern_msg->msg_namelen,
	kern_address);
	if(err < 0)
	return err;
	}
	kern_msg->msg_name = kern_address;
	} else
	kern_msg->msg_name = NULL;

	tot_len = iov_from_user_compat_to_kern(kern_iov,
	(struct compat_iovec __user *)kern_msg->msg_iov,
	kern_msg->msg_iovlen);
	if(tot_len >= 0)
	kern_msg->msg_iov = kern_iov;

	return tot_len;
	}

	/* Bleech... */
	#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))

	#define CMSG_COMPAT_DATA(cmsg) \
	((void __user )((char __user )(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
	#define CMSG_COMPAT_SPACE(len) \
	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
	#define CMSG_COMPAT_LEN(len) \
	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))

	#define CMSG_COMPAT_FIRSTHDR(msg) \
	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
	(struct compat_cmsghdr __user *)((msg)->msg_control) : \
	(struct compat_cmsghdr __user *)NULL)

	#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
	(ucmlen) <= (unsigned long) \
	((mhdr)->msg_controllen - \
	((char )(ucmsg) - (char )(mhdr)->msg_control)))

	static inline struct compat_cmsghdr __user cmsg_compat_nxthdr(struct msghdr msg,
	struct compat_cmsghdr __user *cmsg, int cmsg_len)
	{
	char __user ptr = (char __user )cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
	msg->msg_controllen)
	return NULL;
	return (struct compat_cmsghdr __user *)ptr;
	}

	/* There is a lot of hair here because the alignment rules (and
	* thus placement) of cmsg headers and length are different for
	* 32-bit apps. -DaveM
	*/
	int cmsghdr_from_user_compat_to_kern(struct msghdr kmsg, struct sock sk,
	unsigned char *stackbuf, int stackbuf_size)
	{
	struct compat_cmsghdr __user *ucmsg;
	struct cmsghdr kcmsg, kcmsg_base;
	compat_size_t ucmlen;
	__kernel_size_t kcmlen, tmp;
	int err = -EFAULT;

	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
	if(get_user(ucmlen, &ucmsg->cmsg_len))
	return -EFAULT;

	/* Catch bogons. */
	if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
	return -EINVAL;

	tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
	CMSG_ALIGN(sizeof(struct cmsghdr)));
	tmp = CMSG_ALIGN(tmp);
	kcmlen += tmp;
	ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}
	if(kcmlen == 0)
	return -EINVAL;

	/* The kcmlen holds the 64-bit version of the control length.
	* It may not be modified as we do not stick it into the kmsg
	* until we have successfully copied over all of the data
	* from the user.
	*/
	if (kcmlen > stackbuf_size)
	kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
	if (kcmsg == NULL)
	return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
	if (__get_user(ucmlen, &ucmsg->cmsg_len))
	goto Efault;
	if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
	goto Einval;
	tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
	CMSG_ALIGN(sizeof(struct cmsghdr)));
	if ((char )kcmsg_base + kcmlen - (char )kcmsg < CMSG_ALIGN(tmp))
	goto Einval;
	kcmsg->cmsg_len = tmp;
	tmp = CMSG_ALIGN(tmp);
	if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) \|\|
	__get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) \|\|
	copy_from_user(CMSG_DATA(kcmsg),
	CMSG_COMPAT_DATA(ucmsg),
	(ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
	goto Efault;

	/* Advance. */
	kcmsg = (struct cmsghdr )((char )kcmsg + tmp);
	ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	}

	/* Ok, looks like we made it. Hook it up and return success. */
	kmsg->msg_control = kcmsg_base;
	kmsg->msg_controllen = kcmlen;
	return 0;

	Einval:
	err = -EINVAL;
	Efault:
	if (kcmsg_base != (struct cmsghdr *)stackbuf)
	sock_kfree_s(sk, kcmsg_base, kcmlen);
	return err;
	}

	int put_cmsg_compat(struct msghdr kmsg, int level, int type, int len, void data)
	{
	struct compat_timeval ctv;
	struct compat_cmsghdr __user cm = (struct compat_cmsghdr __user ) kmsg->msg_control;
	struct compat_cmsghdr cmhdr;
	int cmlen;

	if(cm == NULL \|\| kmsg->msg_controllen < sizeof(*cm)) {
	kmsg->msg_flags \|= MSG_CTRUNC;
	return 0; /* XXX: return error? check spec. */
	}

	if (level == SOL_SOCKET && type == SO_TIMESTAMP) {
	struct timeval tv = (struct timeval )data;
	ctv.tv_sec = tv->tv_sec;
	ctv.tv_usec = tv->tv_usec;
	data = &ctv;
	len = sizeof(struct compat_timeval);
	}

	cmlen = CMSG_COMPAT_LEN(len);
	if(kmsg->msg_controllen < cmlen) {
	kmsg->msg_flags \|= MSG_CTRUNC;
	cmlen = kmsg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

	if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
	return -EFAULT;
	if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
	return -EFAULT;
	cmlen = CMSG_COMPAT_SPACE(len);
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
	return 0;
	}

	void scm_detach_fds_compat(struct msghdr kmsg, struct scm_cookie scm)
	{
	struct compat_cmsghdr __user cm = (struct compat_cmsghdr __user ) kmsg->msg_control;
	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int __user *cmfptr;
	int err = 0, i;

	if (fdnum < fdmax)
	fdmax = fdnum;

	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
	int new_fd;
	err = security_file_receive(fp[i]);
	if (err)
	break;
	err = get_unused_fd();
	if (err < 0)
	break;
	new_fd = err;
	err = put_user(new_fd, cmfptr);
	if (err) {
	put_unused_fd(new_fd);
	break;
	}
	/* Bump the usage count and install the file. */
	get_file(fp[i]);
	fd_install(new_fd, fp[i]);
	}

	if (i > 0) {
	int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
	err = put_user(SOL_SOCKET, &cm->cmsg_level);
	if (!err)
	err = put_user(SCM_RIGHTS, &cm->cmsg_type);
	if (!err)
	err = put_user(cmlen, &cm->cmsg_len);
	if (!err) {
	cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
	}
	}
	if (i < fdnum)
	kmsg->msg_flags \|= MSG_CTRUNC;

	/*
	* All of the files that fit in the message have had their
	* usage counts incremented, so we just free the list.
	*/
	__scm_destroy(scm);
	}

	/*
	* For now, we assume that the compatibility and native version
	* of struct ipt_entry are the same - sfr. FIXME
	*/
	struct compat_ipt_replace {
	char name[IPT_TABLE_MAXNAMELEN];
	u32 valid_hooks;
	u32 num_entries;
	u32 size;
	u32 hook_entry[NF_IP_NUMHOOKS];
	u32 underflow[NF_IP_NUMHOOKS];
	u32 num_counters;
	compat_uptr_t counters; /* struct ipt_counters * */
	struct ipt_entry entries[0];
	};

	static int do_netfilter_replace(int fd, int level, int optname,
	char __user *optval, int optlen)
	{
	struct compat_ipt_replace __user *urepl;
	struct ipt_replace __user *repl_nat;
	char name[IPT_TABLE_MAXNAMELEN];
	u32 origsize, tmp32, num_counters;
	unsigned int repl_nat_size;
	int ret;
	int i;
	compat_uptr_t ucntrs;

	urepl = (struct compat_ipt_replace __user *)optval;
	if (get_user(origsize, &urepl->size))
	return -EFAULT;

	/* Hack: Causes ipchains to give correct error msg --RR */
	if (optlen != sizeof(*urepl) + origsize)
	return -ENOPROTOOPT;

	/* XXX Assumes that size of ipt_entry is the same both in
	* native and compat environments.
	*/
	repl_nat_size = sizeof(*repl_nat) + origsize;
	repl_nat = compat_alloc_user_space(repl_nat_size);

	ret = -EFAULT;
	if (put_user(origsize, &repl_nat->size))
	goto out;

	if (!access_ok(VERIFY_READ, urepl, optlen) \|\|
	!access_ok(VERIFY_WRITE, repl_nat, optlen))
	goto out;

	if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) \|\|
	__copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
	goto out;

	if (__get_user(tmp32, &urepl->valid_hooks) \|\|
	__put_user(tmp32, &repl_nat->valid_hooks))
	goto out;

	if (__get_user(tmp32, &urepl->num_entries) \|\|
	__put_user(tmp32, &repl_nat->num_entries))
	goto out;

	if (__get_user(num_counters, &urepl->num_counters) \|\|
	__put_user(num_counters, &repl_nat->num_counters))
	goto out;

	if (__get_user(ucntrs, &urepl->counters) \|\|
	__put_user(compat_ptr(ucntrs), &repl_nat->counters))
	goto out;

	if (__copy_in_user(&repl_nat->entries[0],
	&urepl->entries[0],
	origsize))
	goto out;

	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
	if (__get_user(tmp32, &urepl->hook_entry[i]) \|\|
	__put_user(tmp32, &repl_nat->hook_entry[i]) \|\|
	__get_user(tmp32, &urepl->underflow[i]) \|\|
	__put_user(tmp32, &repl_nat->underflow[i]))
	goto out;
	}

	/*
	* Since struct ipt_counters just contains two u_int64_t members
	* we can just do the access_ok check here and pass the (converted)
	* pointer into the standard syscall. We hope that the pointer is
	* not misaligned ...
	*/
	if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
	num_counters * sizeof(struct ipt_counters)))
	goto out;


	ret = sys_setsockopt(fd, level, optname,
	(char __user *)repl_nat, repl_nat_size);

	out:
	return ret;
	}

	/*
	* A struct sock_filter is architecture independent.
	*/
	struct compat_sock_fprog {
	u16 len;
	compat_uptr_t filter; /* struct sock_filter * */
	};

	static int do_set_attach_filter(struct socket *sock, int level, int optname,
	char __user *optval, int optlen)
	{
	struct compat_sock_fprog __user fprog32 = (struct compat_sock_fprog __user )optval;
	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
	compat_uptr_t ptr;
	u16 len;

	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) \|\|
	!access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) \|\|
	__get_user(len, &fprog32->len) \|\|
	__get_user(ptr, &fprog32->filter) \|\|
	__put_user(len, &kfprog->len) \|\|
	__put_user(compat_ptr(ptr), &kfprog->filter))
	return -EFAULT;

	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
	sizeof(struct sock_fprog));
	}

	static int do_set_sock_timeout(struct socket *sock, int level,
	int optname, char __user *optval, int optlen)
	{
	struct compat_timeval __user up = (struct compat_timeval __user ) optval;
	struct timeval ktime;
	mm_segment_t old_fs;
	int err;

	if (optlen < sizeof(*up))
	return -EINVAL;
	if (!access_ok(VERIFY_READ, up, sizeof(*up)) \|\|
	__get_user(ktime.tv_sec, &up->tv_sec) \|\|
	__get_user(ktime.tv_usec, &up->tv_usec))
	return -EFAULT;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
	set_fs(old_fs);

	return err;
	}

	static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
	char __user *optval, int optlen)
	{
	if (optname == SO_ATTACH_FILTER)
	return do_set_attach_filter(sock, level, optname,
	optval, optlen);
	if (optname == SO_RCVTIMEO \|\| optname == SO_SNDTIMEO)
	return do_set_sock_timeout(sock, level, optname, optval, optlen);

	return sock_setsockopt(sock, level, optname, optval, optlen);
	}

	asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
	char __user *optval, int optlen)
	{
	int err;
	struct socket *sock;

	if (level == SOL_IPV6 && optname == IPT_SO_SET_REPLACE)
	return do_netfilter_replace(fd, level, optname,
	optval, optlen);

	if (optlen < 0)
	return -EINVAL;

	if ((sock = sockfd_lookup(fd, &err))!=NULL)
	{
	err = security_socket_setsockopt(sock,level,optname);
	if (err) {
	sockfd_put(sock);
	return err;
	}

	if (level == SOL_SOCKET)
	err = compat_sock_setsockopt(sock, level,
	optname, optval, optlen);
	else if (sock->ops->compat_setsockopt)
	err = sock->ops->compat_setsockopt(sock, level,
	optname, optval, optlen);
	else
	err = sock->ops->setsockopt(sock, level,
	optname, optval, optlen);
	sockfd_put(sock);
	}
	return err;
	}

	static int do_get_sock_timeout(struct socket *sock, int level, int optname,
	char __user optval, int __user optlen)
	{
	struct compat_timeval __user *up;
	struct timeval ktime;
	mm_segment_t old_fs;
	int len, err;

	up = (struct compat_timeval __user *) optval;
	if (get_user(len, optlen))
	return -EFAULT;
	if (len < sizeof(*up))
	return -EINVAL;
	len = sizeof(ktime);
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
	set_fs(old_fs);

	if (!err) {
	if (put_user(sizeof(*up), optlen) \|\|
	!access_ok(VERIFY_WRITE, up, sizeof(*up)) \|\|
	__put_user(ktime.tv_sec, &up->tv_sec) \|\|
	__put_user(ktime.tv_usec, &up->tv_usec))
	err = -EFAULT;
	}
	return err;
	}

	static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
	char __user optval, int __user optlen)
	{
	if (optname == SO_RCVTIMEO \|\| optname == SO_SNDTIMEO)
	return do_get_sock_timeout(sock, level, optname, optval, optlen);
	return sock_getsockopt(sock, level, optname, optval, optlen);
	}

	int compat_sock_get_timestamp(struct sock sk, struct timeval __user userstamp)
	{
	struct compat_timeval __user *ctv =
	(struct compat_timeval __user*) userstamp;
	int err = -ENOENT;
	struct timeval tv;

	if (!sock_flag(sk, SOCK_TIMESTAMP))
	sock_enable_timestamp(sk);
	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
	return err;
	if (tv.tv_sec == 0) {
	sk->sk_stamp = ktime_get_real();
	tv = ktime_to_timeval(sk->sk_stamp);
	}
	err = 0;
	if (put_user(tv.tv_sec, &ctv->tv_sec) \|\|
	put_user(tv.tv_usec, &ctv->tv_usec))
	err = -EFAULT;
	return err;
	}
	EXPORT_SYMBOL(compat_sock_get_timestamp);

	int compat_sock_get_timestampns(struct sock sk, struct timespec __user userstamp)
	{
	struct compat_timespec __user *ctv =
	(struct compat_timespec __user*) userstamp;
	int err = -ENOENT;
	struct timespec ts;

	if (!sock_flag(sk, SOCK_TIMESTAMP))
	sock_enable_timestamp(sk);
	ts = ktime_to_timespec(sk->sk_stamp);
	if (ts.tv_sec == -1)
	return err;
	if (ts.tv_sec == 0) {
	sk->sk_stamp = ktime_get_real();
	ts = ktime_to_timespec(sk->sk_stamp);
	}
	err = 0;
	if (put_user(ts.tv_sec, &ctv->tv_sec) \|\|
	put_user(ts.tv_nsec, &ctv->tv_nsec))
	err = -EFAULT;
	return err;
	}
	EXPORT_SYMBOL(compat_sock_get_timestampns);

	asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
	char __user optval, int __user optlen)
	{
	int err;
	struct socket *sock;

	if ((sock = sockfd_lookup(fd, &err))!=NULL)
	{
	err = security_socket_getsockopt(sock, level,
	optname);
	if (err) {
	sockfd_put(sock);
	return err;
	}

	if (level == SOL_SOCKET)
	err = compat_sock_getsockopt(sock, level,
	optname, optval, optlen);
	else if (sock->ops->compat_getsockopt)
	err = sock->ops->compat_getsockopt(sock, level,
	optname, optval, optlen);
	else
	err = sock->ops->getsockopt(sock, level,
	optname, optval, optlen);
	sockfd_put(sock);
	}
	return err;
	}
	/* Argument list sizes for compat_sys_socketcall */
	#define AL(x) ((x) * sizeof(u32))
	static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
	AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
	AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
	#undef AL

	asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
	{
	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags \| MSG_CMSG_COMPAT);
	}

	asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
	{
	return sys_recvmsg(fd, (struct msghdr __user *)msg, flags \| MSG_CMSG_COMPAT);
	}

	asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
	{
	int ret;
	u32 a[6];
	u32 a0, a1;

	if (call < SYS_SOCKET \|\| call > SYS_RECVMSG)
	return -EINVAL;
	if (copy_from_user(a, args, nas[call]))
	return -EFAULT;
	a0 = a[0];
	a1 = a[1];

	switch(call) {
	case SYS_SOCKET:
	ret = sys_socket(a0, a1, a[2]);
	break;
	case SYS_BIND:
	ret = sys_bind(a0, compat_ptr(a1), a[2]);
	break;
	case SYS_CONNECT:
	ret = sys_connect(a0, compat_ptr(a1), a[2]);
	break;
	case SYS_LISTEN:
	ret = sys_listen(a0, a1);
	break;
	case SYS_ACCEPT:
	ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
	break;
	case SYS_GETSOCKNAME:
	ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
	break;
	case SYS_GETPEERNAME:
	ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
	break;
	case SYS_SOCKETPAIR:
	ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
	break;
	case SYS_SEND:
	ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
	break;
	case SYS_SENDTO:
	ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
	break;
	case SYS_RECV:
	ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
	break;
	case SYS_RECVFROM:
	ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
	break;
	case SYS_SHUTDOWN:
	ret = sys_shutdown(a0,a1);
	break;
	case SYS_SETSOCKOPT:
	ret = compat_sys_setsockopt(a0, a1, a[2],
	compat_ptr(a[3]), a[4]);
	break;
	case SYS_GETSOCKOPT:
	ret = compat_sys_getsockopt(a0, a1, a[2],
	compat_ptr(a[3]), compat_ptr(a[4]));
	break;
	case SYS_SENDMSG:
	ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
	break;
	case SYS_RECVMSG:
	ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}