/* 
 * 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/sched.h>
#include <linux/types.h>
#include <linux/file.h>
#include <linux/icmpv6.h>
#include <linux/socket.h>
#include <linux/filter.h>

#include <net/scm.h>
#include <net/sock.h>
#include <asm/ia32.h>
#include <asm/uaccess.h>
#include <asm/socket32.h>

#define A(__x)		((unsigned long)(__x))
#define AA(__x)		((unsigned long)(__x))


static inline int iov_from_user32_to_kern(struct iovec *kiov,
					  struct iovec32 *uiov32,
					  int niov)
{
	int tot_len = 0;

	while(niov > 0) {
		u32 len, buf;

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

static inline int msghdr_from_user32_to_kern(struct msghdr *kmsg,
					     struct msghdr32 *umsg)
{
	u32 tmp1, tmp2, tmp3;
	int err;

	err = get_user(tmp1, &umsg->msg_name);
	err |= __get_user(tmp2, &umsg->msg_iov);
	err |= __get_user(tmp3, &umsg->msg_control);
	if (err)
		return -EFAULT;

	kmsg->msg_name = (void *)A(tmp1);
	kmsg->msg_iov = (struct iovec *)A(tmp2);
	kmsg->msg_control = (void *)A(tmp3);

	err = get_user(kmsg->msg_namelen, &umsg->msg_namelen);
	err |= get_user(kmsg->msg_iovlen, &umsg->msg_iovlen);
	err |= get_user(kmsg->msg_controllen, &umsg->msg_controllen);
	err |= get_user(kmsg->msg_flags, &umsg->msg_flags);
	
	return err;
}

/* I've named the args so it is easy to tell whose space the pointers are in. */
static int verify_iovec32(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;

	if(kern_msg->msg_iovlen > UIO_FASTIOV) {
		kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec),
				   GFP_KERNEL);
		if(!kern_iov)
			return -ENOMEM;
	}

	tot_len = iov_from_user32_to_kern(kern_iov,
					  (struct iovec32 *)kern_msg->msg_iov,
					  kern_msg->msg_iovlen);
	if(tot_len >= 0)
		kern_msg->msg_iov = kern_iov;
	else if(kern_msg->msg_iovlen > UIO_FASTIOV)
		kfree(kern_iov);

	return tot_len;
}

/* 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
 */
static int cmsghdr_from_user32_to_kern(struct msghdr *kmsg,
				       unsigned char *stackbuf, int stackbuf_size)
{
	struct cmsghdr32 *ucmsg;
	struct cmsghdr *kcmsg, *kcmsg_base;
	__kernel_size_t32 ucmlen;
	__kernel_size_t kcmlen, tmp;

	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
		if(get_user(ucmlen, &ucmsg->cmsg_len))
			return -EFAULT;

		/* Catch bogons. */
		if(CMSG32_ALIGN(ucmlen) <
		   CMSG32_ALIGN(sizeof(struct cmsghdr32)))
			return -EINVAL;
		if((unsigned long)(((char *)ucmsg - (char *)kmsg->msg_control)
				   + ucmlen) > kmsg->msg_controllen)
			return -EINVAL;

		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		kcmlen += tmp;
		ucmsg = CMSG32_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 = kmalloc(kcmlen, GFP_KERNEL);
	if(kcmsg == NULL)
		return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
		__get_user(ucmlen, &ucmsg->cmsg_len);
		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		kcmsg->cmsg_len = tmp;
		__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
		__get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);

		/* Copy over the data. */
		if(copy_from_user(CMSG_DATA(kcmsg),
				  CMSG32_DATA(ucmsg),
				  (ucmlen - CMSG32_ALIGN(sizeof(*ucmsg)))))
			goto out_free_efault;

		/* Advance. */
		kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp));
		ucmsg = CMSG32_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;

out_free_efault:
	if(kcmsg_base != (struct cmsghdr *)stackbuf)
		kfree(kcmsg_base);
	return -EFAULT;
}

static void put_cmsg32(struct msghdr *kmsg, int level, int type,
		       int len, void *data)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	struct cmsghdr32 cmhdr;
	int cmlen = CMSG32_LEN(len);

	if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
		kmsg->msg_flags |= MSG_CTRUNC;
		return;
	}

	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;
	if(copy_to_user(CMSG32_DATA(cm), data, cmlen - sizeof(struct cmsghdr32)))
		return;
	cmlen = CMSG32_SPACE(len);
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
}

static void scm_detach_fds32(struct msghdr *kmsg, struct scm_cookie *scm)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	int fdmax = (kmsg->msg_controllen - sizeof(struct cmsghdr32)) / sizeof(int);
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int *cmfptr;
	int err = 0, i;

	if (fdnum < fdmax)
		fdmax = fdnum;

	for (i = 0, cmfptr = (int *) CMSG32_DATA(cm); i < fdmax; i++, cmfptr++) {
		int new_fd;
		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 = CMSG32_LEN(i * sizeof(int));
		if (!err)
			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 = CMSG32_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);
}

/* In these cases we (currently) can just copy to data over verbatim
 * because all CMSGs created by the kernel have well defined types which
 * have the same layout in both the 32-bit and 64-bit API.  One must add
 * some special cased conversions here if we start sending control messages
 * with incompatible types.
 *
 * SCM_RIGHTS and SCM_CREDENTIALS are done by hand in recvmsg32 right after
 * we do our work.  The remaining cases are:
 *
 * SOL_IP	IP_PKTINFO	struct in_pktinfo	32-bit clean
 *		IP_TTL		int			32-bit clean
 *		IP_TOS		__u8			32-bit clean
 *		IP_RECVOPTS	variable length		32-bit clean
 *		IP_RETOPTS	variable length		32-bit clean
 *		(these last two are clean because the types are defined
 *		 by the IPv4 protocol)
 *		IP_RECVERR	struct sock_extended_err +
 *				struct sockaddr_in	32-bit clean
 * SOL_IPV6	IPV6_RECVERR	struct sock_extended_err +
 *				struct sockaddr_in6	32-bit clean
 *		IPV6_PKTINFO	struct in6_pktinfo	32-bit clean
 *		IPV6_HOPLIMIT	int			32-bit clean
 *		IPV6_FLOWINFO	u32			32-bit clean
 *		IPV6_HOPOPTS	ipv6 hop exthdr		32-bit clean
 *		IPV6_DSTOPTS	ipv6 dst exthdr(s)	32-bit clean
 *		IPV6_RTHDR	ipv6 routing exthdr	32-bit clean
 *		IPV6_AUTHHDR	ipv6 auth exthdr	32-bit clean
 */
static void cmsg32_recvmsg_fixup(struct msghdr *kmsg, unsigned long orig_cmsg_uptr)
{
	unsigned char *workbuf, *wp;
	unsigned long bufsz, space_avail;
	struct cmsghdr *ucmsg;

	bufsz = ((unsigned long)kmsg->msg_control) - orig_cmsg_uptr;
	space_avail = kmsg->msg_controllen + bufsz;
	wp = workbuf = kmalloc(bufsz, GFP_KERNEL);
	if(workbuf == NULL)
		goto fail;

	/* To make this more sane we assume the kernel sends back properly
	 * formatted control messages.  Because of how the kernel will truncate
	 * the cmsg_len for MSG_TRUNC cases, we need not check that case either.
	 */
	ucmsg = (struct cmsghdr *) orig_cmsg_uptr;
	while(((unsigned long)ucmsg) <=
	      (((unsigned long)kmsg->msg_control) - sizeof(struct cmsghdr))) {
		struct cmsghdr32 *kcmsg32 = (struct cmsghdr32 *) wp;
		int clen64, clen32;

		/* UCMSG is the 64-bit format CMSG entry in user-space.
		 * KCMSG32 is within the kernel space temporary buffer
		 * we use to convert into a 32-bit style CMSG.
		 */
		__get_user(kcmsg32->cmsg_len, &ucmsg->cmsg_len);
		__get_user(kcmsg32->cmsg_level, &ucmsg->cmsg_level);
		__get_user(kcmsg32->cmsg_type, &ucmsg->cmsg_type);

		clen64 = kcmsg32->cmsg_len;
		copy_from_user(CMSG32_DATA(kcmsg32), CMSG_DATA(ucmsg),
			       clen64 - CMSG_ALIGN(sizeof(*ucmsg)));
		clen32 = ((clen64 - CMSG_ALIGN(sizeof(*ucmsg))) +
			  CMSG32_ALIGN(sizeof(struct cmsghdr32)));
		kcmsg32->cmsg_len = clen32;

		ucmsg = (struct cmsghdr *) (((char *)ucmsg) + CMSG_ALIGN(clen64));
		wp = (((char *)kcmsg32) + CMSG32_ALIGN(clen32));
	}

	/* Copy back fixed up data, and adjust pointers. */
	bufsz = (wp - workbuf);
	copy_to_user((void *)orig_cmsg_uptr, workbuf, bufsz);

	kmsg->msg_control = (struct cmsghdr *)
		(((char *)orig_cmsg_uptr) + bufsz);
	kmsg->msg_controllen = space_avail - bufsz;

	kfree(workbuf);
	return;

fail:
	/* If we leave the 64-bit format CMSG chunks in there,
	 * the application could get confused and crash.  So to
	 * ensure greater recovery, we report no CMSGs.
	 */
	kmsg->msg_controllen += bufsz;
	kmsg->msg_control = (void *) orig_cmsg_uptr;
}

asmlinkage int sys32_sendmsg(int fd, struct msghdr32 *user_msg, unsigned user_flags)
{
	struct socket *sock;
	char address[MAX_SOCK_ADDR];
	struct iovec iov[UIO_FASTIOV];
	unsigned char ctl[sizeof(struct cmsghdr) + 20];
	unsigned char *ctl_buf = ctl;
	struct msghdr kern_msg;
	int err, total_len;

	if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
		return -EFAULT;
	if(kern_msg.msg_iovlen > UIO_MAXIOV)
		return -EINVAL;
	err = verify_iovec32(&kern_msg, iov, address, VERIFY_READ);
	if (err < 0)
		goto out;
	total_len = err;

	if(kern_msg.msg_controllen) {
		err = cmsghdr_from_user32_to_kern(&kern_msg, ctl, sizeof(ctl));
		if(err)
			goto out_freeiov;
		ctl_buf = kern_msg.msg_control;
	}
	kern_msg.msg_flags = user_flags;

	sock = sockfd_lookup(fd, &err);
	if (sock != NULL) {
		if (sock->file->f_flags & O_NONBLOCK)
			kern_msg.msg_flags |= MSG_DONTWAIT;
		err = sock_sendmsg(sock, &kern_msg, total_len);
		sockfd_put(sock);
	}

	/* N.B. Use kfree here, as kern_msg.msg_controllen might change? */
	if(ctl_buf != ctl)
		kfree(ctl_buf);
out_freeiov:
	if(kern_msg.msg_iov != iov)
		kfree(kern_msg.msg_iov);
out:
	return err;
}

asmlinkage int sys32_recvmsg(int fd, struct msghdr32 *user_msg, unsigned int user_flags)
{
	struct iovec iovstack[UIO_FASTIOV];
	struct msghdr kern_msg;
	char addr[MAX_SOCK_ADDR];
	struct socket *sock;
	struct iovec *iov = iovstack;
	struct sockaddr *uaddr;
	int *uaddr_len;
	unsigned long cmsg_ptr;
	int err, total_len, len = 0;

	if(msghdr_from_user32_to_kern(&kern_msg, user_msg))
		return -EFAULT;
	if(kern_msg.msg_iovlen > UIO_MAXIOV)
		return -EINVAL;

	uaddr = kern_msg.msg_name;
	uaddr_len = &user_msg->msg_namelen;
	err = verify_iovec32(&kern_msg, iov, addr, VERIFY_WRITE);
	if (err < 0)
		goto out;
	total_len = err;

	cmsg_ptr = (unsigned long) kern_msg.msg_control;
	kern_msg.msg_flags = 0;

	sock = sockfd_lookup(fd, &err);
	if (sock != NULL) {
		struct scm_cookie scm;

		if (sock->file->f_flags & O_NONBLOCK)
			user_flags |= MSG_DONTWAIT;
		memset(&scm, 0, sizeof(scm));
		err = sock->ops->recvmsg(sock, &kern_msg, total_len,
					 user_flags, &scm);
		if(err >= 0) {
			len = err;
			if(!kern_msg.msg_control) {
				if(sock->passcred || scm.fp)
					kern_msg.msg_flags |= MSG_CTRUNC;
				if(scm.fp)
					__scm_destroy(&scm);
			} else {
				/* If recvmsg processing itself placed some
				 * control messages into user space, it's is
				 * using 64-bit CMSG processing, so we need
				 * to fix it up before we tack on more stuff.
				 */
				if((unsigned long) kern_msg.msg_control != cmsg_ptr)
					cmsg32_recvmsg_fixup(&kern_msg, cmsg_ptr);

				/* Wheee... */
				if(sock->passcred)
					put_cmsg32(&kern_msg,
						   SOL_SOCKET, SCM_CREDENTIALS,
						   sizeof(scm.creds), &scm.creds);
				if(scm.fp != NULL)
					scm_detach_fds32(&kern_msg, &scm);
			}
		}
		sockfd_put(sock);
	}

	if(uaddr != NULL && err >= 0)
		err = move_addr_to_user(addr, kern_msg.msg_namelen, uaddr, uaddr_len);
	if(cmsg_ptr != 0 && err >= 0) {
		unsigned long ucmsg_ptr = ((unsigned long)kern_msg.msg_control);
		__kernel_size_t32 uclen = (__kernel_size_t32) (ucmsg_ptr - cmsg_ptr);
		err |= __put_user(uclen, &user_msg->msg_controllen);
	}
	if(err >= 0)
		err = __put_user(kern_msg.msg_flags, &user_msg->msg_flags);
	if(kern_msg.msg_iov != iov)
		kfree(kern_msg.msg_iov);
out:
	if(err < 0)
		return err;
	return len;
}

extern asmlinkage int sys_setsockopt(int fd, int level, int optname,
				     char *optval, int optlen);

static int do_set_attach_filter(int fd, int level, int optname,
				char *optval, int optlen)
{
	struct sock_fprog32 {
		__u16 len;
		__u32 filter;
	} *fprog32 = (struct sock_fprog32 *)optval;
	struct sock_fprog kfprog;
	struct sock_filter *kfilter;
	unsigned int fsize;
	mm_segment_t old_fs;
	__u32 uptr;
	int ret;

	if (get_user(kfprog.len, &fprog32->len) ||
	    __get_user(uptr, &fprog32->filter))
		return -EFAULT;

	kfprog.filter = (struct sock_filter *)A(uptr);
	fsize = kfprog.len * sizeof(struct sock_filter);

	kfilter = (struct sock_filter *)kmalloc(fsize, GFP_KERNEL);
	if (kfilter == NULL)
		return -ENOMEM;

	if (copy_from_user(kfilter, kfprog.filter, fsize)) {
		kfree(kfilter);
		return -EFAULT;
	}

	kfprog.filter = kfilter;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_setsockopt(fd, level, optname,
			     (char *)&kfprog, sizeof(kfprog));
	set_fs(old_fs);

	kfree(kfilter);

	return ret;
}

static int do_set_icmpv6_filter(int fd, int level, int optname,
				char *optval, int optlen)
{
	struct icmp6_filter kfilter;
	mm_segment_t old_fs;
	int ret, i;

	if (copy_from_user(&kfilter, optval, sizeof(kfilter)))
		return -EFAULT;


	for (i = 0; i < 8; i += 2) {
		u32 tmp = kfilter.data[i];

		kfilter.data[i] = kfilter.data[i + 1];
		kfilter.data[i + 1] = tmp;
	}

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_setsockopt(fd, level, optname,
			     (char *) &kfilter, sizeof(kfilter));
	set_fs(old_fs);

	return ret;
}

asmlinkage int sys32_setsockopt(int fd, int level, int optname,
				char *optval, int optlen)
{
	if (optname == SO_ATTACH_FILTER)
		return do_set_attach_filter(fd, level, optname,
					    optval, optlen);
	if (level == SOL_ICMPV6 && optname == ICMPV6_FILTER)
		return do_set_icmpv6_filter(fd, level, optname,
					    optval, optlen);

	return sys_setsockopt(fd, level, optname, optval, optlen);
}


/* Argument list sizes for 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

extern asmlinkage long sys_bind(int fd, struct sockaddr *umyaddr, int addrlen);
extern asmlinkage long sys_connect(int fd, struct sockaddr *uservaddr,
				  int addrlen);
extern asmlinkage long sys_accept(int fd, struct sockaddr *upeer_sockaddr,
				 int *upeer_addrlen); 
extern asmlinkage long sys_getsockname(int fd, struct sockaddr *usockaddr,
				      int *usockaddr_len);
extern asmlinkage long sys_getpeername(int fd, struct sockaddr *usockaddr,
				      int *usockaddr_len);
extern asmlinkage long sys_send(int fd, void *buff, size_t len, unsigned flags);
extern asmlinkage long sys_sendto(int fd, u32 buff, __kernel_size_t32 len,
				   unsigned flags, u32 addr, int addr_len);
extern asmlinkage long sys_recv(int fd, void *ubuf, size_t size, unsigned flags);
extern asmlinkage long sys_recvfrom(int fd, u32 ubuf, __kernel_size_t32 size,
				     unsigned flags, u32 addr, u32 addr_len);
extern asmlinkage long sys_getsockopt(int fd, int level, int optname,
				       u32 optval, u32 optlen);

extern asmlinkage long sys_socket(int family, int type, int protocol);
extern asmlinkage long sys_socketpair(int family, int type, int protocol,
				     int usockvec[2]);
extern asmlinkage long sys_shutdown(int fd, int how);
extern asmlinkage long sys_listen(int fd, int backlog);

asmlinkage long sys32_socketcall(int call, u32 *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, (struct sockaddr *)A(a1), a[2]);
			break;
		case SYS_CONNECT:
			ret = sys_connect(a0, (struct sockaddr *)A(a1), a[2]);
			break;
		case SYS_LISTEN:
			ret = sys_listen(a0, a1);
			break;
		case SYS_ACCEPT:
			ret = sys_accept(a0, (struct sockaddr *)A(a1),
					  (int *)A(a[2]));
			break;
		case SYS_GETSOCKNAME:
			ret = sys_getsockname(a0, (struct sockaddr *)A(a1),
					       (int *)A(a[2]));
			break;
		case SYS_GETPEERNAME:
			ret = sys_getpeername(a0, (struct sockaddr *)A(a1),
					       (int *)A(a[2]));
			break;
		case SYS_SOCKETPAIR:
			ret = sys_socketpair(a0, a1, a[2], (int *)A(a[3]));
			break;
		case SYS_SEND:
			ret = sys_send(a0, (void *)A(a1), a[2], a[3]);
			break;
		case SYS_SENDTO:
			ret = sys_sendto(a0, a1, a[2], a[3], a[4], a[5]);
			break;
		case SYS_RECV:
			ret = sys_recv(a0, (void *)A(a1), a[2], a[3]);
			break;
		case SYS_RECVFROM:
			ret = sys_recvfrom(a0, a1, a[2], a[3], a[4], a[5]);
			break;
		case SYS_SHUTDOWN:
			ret = sys_shutdown(a0,a1);
			break;
		case SYS_SETSOCKOPT:
			ret = sys_setsockopt(a0, a1, a[2], (char *)A(a[3]),
					      a[4]);
			break;
		case SYS_GETSOCKOPT:
			ret = sys_getsockopt(a0, a1, a[2], a[3], a[4]);
			break;
		case SYS_SENDMSG:
			ret = sys32_sendmsg(a0, (struct msghdr32 *)A(a1),
					     a[2]);
			break;
		case SYS_RECVMSG:
			ret = sys32_recvmsg(a0, (struct msghdr32 *)A(a1),
					     a[2]);
			break;
		default:
			ret = -EINVAL;
			break;
	}
	return ret;
}