/*

   * 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/gfp.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/security.h>

  #include <linux/export.h>

  
  #include <net/scm.h>
  #include <net/sock.h>

  #include <net/ip.h>
  #include <net/ipv6.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))
  			return -EFAULT;
  
  		if (len > INT_MAX - tot_len)
  			len = INT_MAX - tot_len;

  		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,

  		   struct sockaddr *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_timespec cts[3];

  	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 == SCM_TIMESTAMP) {

  		struct timeval *tv = (struct timeval *)data;
  		ctv.tv_sec = tv->tv_sec;
  		ctv.tv_usec = tv->tv_usec;
  		data = &ctv;

  		len = sizeof(ctv);
  	}

  	if (level == SOL_SOCKET &&
  	    (type == SCM_TIMESTAMPNS || type == SCM_TIMESTAMPING)) {
  		int count = type == SCM_TIMESTAMPNS ? 1 : 3;
  		int i;

  		struct timespec *ts = (struct timespec *)data;

  		for (i = 0; i < count; i++) {
  			cts[i].tv_sec = ts[i].tv_sec;
  			cts[i].tv_nsec = ts[i].tv_nsec;
  		}

  		data = &cts;

  		len = sizeof(cts[0]) * count;

  	}

  	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);

  	if (kmsg->msg_controllen < cmlen)
  		cmlen = kmsg->msg_controllen;

  	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_flags(MSG_CMSG_CLOEXEC & kmsg->msg_flags
  					  ? O_CLOEXEC : 0);

  		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);
  }
  
  /*

   * 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, unsigned 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, unsigned 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, unsigned 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, unsigned int optlen)

  {

  	int err;

  	struct socket *sock = sockfd_lookup(fd, &err);

  	if (sock) {
  		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, SOCK_TIMESTAMP);

  	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, SOCK_TIMESTAMP);

  	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 = sockfd_lookup(fd, &err);

  	if (sock) {
  		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;
  }

  
  struct compat_group_req {
  	__u32				 gr_interface;
  	struct __kernel_sockaddr_storage gr_group
  		__attribute__ ((aligned(4)));

  } __packed;

  
  struct compat_group_source_req {
  	__u32				 gsr_interface;
  	struct __kernel_sockaddr_storage gsr_group
  		__attribute__ ((aligned(4)));
  	struct __kernel_sockaddr_storage gsr_source
  		__attribute__ ((aligned(4)));

  } __packed;

  
  struct compat_group_filter {
  	__u32				 gf_interface;
  	struct __kernel_sockaddr_storage gf_group
  		__attribute__ ((aligned(4)));
  	__u32				 gf_fmode;
  	__u32				 gf_numsrc;
  	struct __kernel_sockaddr_storage gf_slist[1]
  		__attribute__ ((aligned(4)));

  } __packed;

  #define __COMPAT_GF0_SIZE (sizeof(struct compat_group_filter) - \
  			sizeof(struct __kernel_sockaddr_storage))

  
  int compat_mc_setsockopt(struct sock *sock, int level, int optname,

  	char __user *optval, unsigned int optlen,

  	int (*setsockopt)(struct sock *, int, int, char __user *, unsigned int))

  {
  	char __user	*koptval = optval;
  	int		koptlen = optlen;
  
  	switch (optname) {
  	case MCAST_JOIN_GROUP:
  	case MCAST_LEAVE_GROUP:
  	{
  		struct compat_group_req __user *gr32 = (void *)optval;
  		struct group_req __user *kgr =
  			compat_alloc_user_space(sizeof(struct group_req));
  		u32 interface;
  
  		if (!access_ok(VERIFY_READ, gr32, sizeof(*gr32)) ||
  		    !access_ok(VERIFY_WRITE, kgr, sizeof(struct group_req)) ||
  		    __get_user(interface, &gr32->gr_interface) ||
  		    __put_user(interface, &kgr->gr_interface) ||
  		    copy_in_user(&kgr->gr_group, &gr32->gr_group,
  				sizeof(kgr->gr_group)))
  			return -EFAULT;
  		koptval = (char __user *)kgr;
  		koptlen = sizeof(struct group_req);
  		break;
  	}
  	case MCAST_JOIN_SOURCE_GROUP:
  	case MCAST_LEAVE_SOURCE_GROUP:
  	case MCAST_BLOCK_SOURCE:
  	case MCAST_UNBLOCK_SOURCE:
  	{
  		struct compat_group_source_req __user *gsr32 = (void *)optval;

  		struct group_source_req __user *kgsr = compat_alloc_user_space(

  			sizeof(struct group_source_req));
  		u32 interface;
  
  		if (!access_ok(VERIFY_READ, gsr32, sizeof(*gsr32)) ||
  		    !access_ok(VERIFY_WRITE, kgsr,
  			sizeof(struct group_source_req)) ||
  		    __get_user(interface, &gsr32->gsr_interface) ||
  		    __put_user(interface, &kgsr->gsr_interface) ||
  		    copy_in_user(&kgsr->gsr_group, &gsr32->gsr_group,
  				sizeof(kgsr->gsr_group)) ||
  		    copy_in_user(&kgsr->gsr_source, &gsr32->gsr_source,
  				sizeof(kgsr->gsr_source)))
  			return -EFAULT;
  		koptval = (char __user *)kgsr;
  		koptlen = sizeof(struct group_source_req);
  		break;
  	}
  	case MCAST_MSFILTER:
  	{
  		struct compat_group_filter __user *gf32 = (void *)optval;

  		struct group_filter __user *kgf;

  		u32 interface, fmode, numsrc;

  		if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||

  		    __get_user(interface, &gf32->gf_interface) ||
  		    __get_user(fmode, &gf32->gf_fmode) ||
  		    __get_user(numsrc, &gf32->gf_numsrc))
  			return -EFAULT;
  		koptlen = optlen + sizeof(struct group_filter) -
  				sizeof(struct compat_group_filter);
  		if (koptlen < GROUP_FILTER_SIZE(numsrc))
  			return -EINVAL;
  		kgf = compat_alloc_user_space(koptlen);
  		if (!access_ok(VERIFY_WRITE, kgf, koptlen) ||
  		    __put_user(interface, &kgf->gf_interface) ||
  		    __put_user(fmode, &kgf->gf_fmode) ||
  		    __put_user(numsrc, &kgf->gf_numsrc) ||
  		    copy_in_user(&kgf->gf_group, &gf32->gf_group,
  				sizeof(kgf->gf_group)) ||

  		    (numsrc && copy_in_user(kgf->gf_slist, gf32->gf_slist,

  				numsrc * sizeof(kgf->gf_slist[0]))))
  			return -EFAULT;
  		koptval = (char __user *)kgf;
  		break;
  	}
  
  	default:
  		break;
  	}
  	return setsockopt(sock, level, optname, koptval, koptlen);
  }

  EXPORT_SYMBOL(compat_mc_setsockopt);

  int compat_mc_getsockopt(struct sock *sock, int level, int optname,
  	char __user *optval, int __user *optlen,

  	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))

  {
  	struct compat_group_filter __user *gf32 = (void *)optval;
  	struct group_filter __user *kgf;
  	int __user	*koptlen;
  	u32 interface, fmode, numsrc;
  	int klen, ulen, err;
  
  	if (optname != MCAST_MSFILTER)
  		return getsockopt(sock, level, optname, optval, optlen);
  
  	koptlen = compat_alloc_user_space(sizeof(*koptlen));
  	if (!access_ok(VERIFY_READ, optlen, sizeof(*optlen)) ||
  	    __get_user(ulen, optlen))
  		return -EFAULT;
  
  	/* adjust len for pad */
  	klen = ulen + sizeof(*kgf) - sizeof(*gf32);
  
  	if (klen < GROUP_FILTER_SIZE(0))
  		return -EINVAL;
  
  	if (!access_ok(VERIFY_WRITE, koptlen, sizeof(*koptlen)) ||
  	    __put_user(klen, koptlen))
  		return -EFAULT;
  
  	/* have to allow space for previous compat_alloc_user_space, too */
  	kgf = compat_alloc_user_space(klen+sizeof(*optlen));
  
  	if (!access_ok(VERIFY_READ, gf32, __COMPAT_GF0_SIZE) ||
  	    __get_user(interface, &gf32->gf_interface) ||
  	    __get_user(fmode, &gf32->gf_fmode) ||
  	    __get_user(numsrc, &gf32->gf_numsrc) ||
  	    __put_user(interface, &kgf->gf_interface) ||
  	    __put_user(fmode, &kgf->gf_fmode) ||
  	    __put_user(numsrc, &kgf->gf_numsrc) ||

  	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))

  		return -EFAULT;
  
  	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
  	if (err)
  		return err;
  
  	if (!access_ok(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
  	    __get_user(klen, koptlen))
  		return -EFAULT;
  
  	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
  
  	if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
  	    __put_user(ulen, optlen))
  		return -EFAULT;
  
  	if (!access_ok(VERIFY_READ, kgf, klen) ||
  	    !access_ok(VERIFY_WRITE, gf32, ulen) ||
  	    __get_user(interface, &kgf->gf_interface) ||
  	    __get_user(fmode, &kgf->gf_fmode) ||
  	    __get_user(numsrc, &kgf->gf_numsrc) ||
  	    __put_user(interface, &gf32->gf_interface) ||
  	    __put_user(fmode, &gf32->gf_fmode) ||
  	    __put_user(numsrc, &gf32->gf_numsrc))
  		return -EFAULT;
  	if (numsrc) {
  		int copylen;
  
  		klen -= GROUP_FILTER_SIZE(0);
  		copylen = numsrc * sizeof(gf32->gf_slist[0]);
  		if (copylen > klen)
  			copylen = klen;

  		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))

  			return -EFAULT;
  	}
  	return err;
  }

  EXPORT_SYMBOL(compat_mc_getsockopt);

  /* Argument list sizes for compat_sys_socketcall */
  #define AL(x) ((x) * sizeof(u32))

  static unsigned char nas[21] = {

  	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),

  	AL(4), AL(5), AL(4)

  };

  #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_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
  				    unsigned vlen, unsigned int flags)
  {
  	return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
  			      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_recv(int fd, void __user *buf, size_t len, unsigned flags)
  {
  	return sys_recv(fd, buf, len, flags | MSG_CMSG_COMPAT);
  }
  
  asmlinkage long compat_sys_recvfrom(int fd, void __user *buf, size_t len,
  				    unsigned flags, struct sockaddr __user *addr,
  				    int __user *addrlen)
  {
  	return sys_recvfrom(fd, buf, len, flags | MSG_CMSG_COMPAT, addr, addrlen);
  }

  asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
  				    unsigned vlen, unsigned int flags,

  				    struct compat_timespec __user *timeout)

  {
  	int datagrams;
  	struct timespec ktspec;

  	if (timeout == NULL)
  		return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
  				      flags | MSG_CMSG_COMPAT, NULL);

  	if (get_compat_timespec(&ktspec, timeout))

  		return -EFAULT;
  
  	datagrams = __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
  				   flags | MSG_CMSG_COMPAT, &ktspec);

  	if (datagrams > 0 && put_compat_timespec(&ktspec, timeout))

  		datagrams = -EFAULT;
  
  	return datagrams;
  }

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

  	if (call < SYS_SOCKET || call > SYS_SENDMMSG)

  		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_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), 0);

  		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 = compat_sys_recv(a0, compat_ptr(a1), a[2], a[3]);

  		break;
  	case SYS_RECVFROM:

  		ret = compat_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_SENDMMSG:
  		ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
  		break;

  	case SYS_RECVMSG:
  		ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
  		break;

  	case SYS_RECVMMSG:
  		ret = compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],
  					  compat_ptr(a[4]));
  		break;

  	case SYS_ACCEPT4:
  		ret = sys_accept4(a0, compat_ptr(a1), compat_ptr(a[2]), a[3]);

  		break;

  	default:
  		ret = -EINVAL;
  		break;
  	}
  	return ret;
  }