[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / compat.c

/* 
 * 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/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));
		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 = 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;

	/* SO_SET_REPLACE seems to be the same in all levels */
	if (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);
}

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;
}
Commit	Line	Data
1da177e4 LT	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/sched.h>
	17	#include <linux/types.h>
	18	#include <linux/file.h>
	19	#include <linux/icmpv6.h>
	20	#include <linux/socket.h>
	21	#include <linux/syscalls.h>
	22	#include <linux/filter.h>
	23	#include <linux/compat.h>
	24	#include <linux/netfilter_ipv4/ip_tables.h>
	25	#include <linux/security.h>
	26
	27	#include <net/scm.h>
	28	#include <net/sock.h>
	29	#include <asm/uaccess.h>
	30	#include <net/compat.h>
	31
	32	static inline int iov_from_user_compat_to_kern(struct iovec *kiov,
	33	struct compat_iovec __user *uiov32,
	34	int niov)
	35	{
	36	int tot_len = 0;
	37
	38	while(niov > 0) {
	39	compat_uptr_t buf;
	40	compat_size_t len;
	41
	42	if(get_user(len, &uiov32->iov_len) \|\|
	43	get_user(buf, &uiov32->iov_base)) {
	44	tot_len = -EFAULT;
	45	break;
	46	}
	47	tot_len += len;
	48	kiov->iov_base = compat_ptr(buf);
	49	kiov->iov_len = (__kernel_size_t) len;
	50	uiov32++;
	51	kiov++;
	52	niov--;
	53	}
	54	return tot_len;
	55	}
	56
	57	int get_compat_msghdr(struct msghdr kmsg, struct compat_msghdr __user umsg)
	58	{
	59	compat_uptr_t tmp1, tmp2, tmp3;
	60
	61	if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) \|\|
	62	__get_user(tmp1, &umsg->msg_name) \|\|
	63	__get_user(kmsg->msg_namelen, &umsg->msg_namelen) \|\|
	64	__get_user(tmp2, &umsg->msg_iov) \|\|
65	__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) \|\|
66	__get_user(tmp3, &umsg->msg_control) \|\|
67	__get_user(kmsg->msg_controllen, &umsg->msg_controllen) \|\|
68	__get_user(kmsg->msg_flags, &umsg->msg_flags))
69	return -EFAULT;
70	kmsg->msg_name = compat_ptr(tmp1);
71	kmsg->msg_iov = compat_ptr(tmp2);
72	kmsg->msg_control = compat_ptr(tmp3);
73	return 0;
74	}
75
76	/* I've named the args so it is easy to tell whose space the pointers are in. */
77	int verify_compat_iovec(struct msghdr kern_msg, struct iovec kern_iov,
78	char *kern_address, int mode)
79	{
80	int tot_len;
81
82	if(kern_msg->msg_namelen) {
83	if(mode==VERIFY_READ) {
84	int err = move_addr_to_kernel(kern_msg->msg_name,
85	kern_msg->msg_namelen,
86	kern_address);
87	if(err < 0)
88	return err;
89	}
90	kern_msg->msg_name = kern_address;
91	} else
92	kern_msg->msg_name = NULL;
93
1da177e4 LT	94	tot_len = iov_from_user_compat_to_kern(kern_iov,
	95	(struct compat_iovec __user *)kern_msg->msg_iov,
	96	kern_msg->msg_iovlen);
	97	if(tot_len >= 0)
	98	kern_msg->msg_iov = kern_iov;
1da177e4 LT	99
	100	return tot_len;
	101	}
	102
	103	/* Bleech... */
	104	#define CMSG_COMPAT_ALIGN(len) ALIGN((len), sizeof(s32))
	105
	106	#define CMSG_COMPAT_DATA(cmsg) \
	107	((void __user )((char __user )(cmsg) + CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr))))
	108	#define CMSG_COMPAT_SPACE(len) \
	109	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + CMSG_COMPAT_ALIGN(len))
	110	#define CMSG_COMPAT_LEN(len) \
	111	(CMSG_COMPAT_ALIGN(sizeof(struct compat_cmsghdr)) + (len))
	112
	113	#define CMSG_COMPAT_FIRSTHDR(msg) \
	114	(((msg)->msg_controllen) >= sizeof(struct compat_cmsghdr) ? \
	115	(struct compat_cmsghdr __user *)((msg)->msg_control) : \
	116	(struct compat_cmsghdr __user *)NULL)
	117
	118	#define CMSG_COMPAT_OK(ucmlen, ucmsg, mhdr) \
	119	((ucmlen) >= sizeof(struct compat_cmsghdr) && \
	120	(ucmlen) <= (unsigned long) \
	121	((mhdr)->msg_controllen - \
	122	((char )(ucmsg) - (char )(mhdr)->msg_control)))
	123
	124	static inline struct compat_cmsghdr __user cmsg_compat_nxthdr(struct msghdr msg,
	125	struct compat_cmsghdr __user *cmsg, int cmsg_len)
	126	{
	127	char __user ptr = (char __user )cmsg + CMSG_COMPAT_ALIGN(cmsg_len);
	128	if ((unsigned long)(ptr + 1 - (char __user *)msg->msg_control) >
	129	msg->msg_controllen)
	130	return NULL;
	131	return (struct compat_cmsghdr __user *)ptr;
	132	}
	133
	134	/* There is a lot of hair here because the alignment rules (and
	135	* thus placement) of cmsg headers and length are different for
	136	* 32-bit apps. -DaveM
	137	*/
8920e8f9	138	int cmsghdr_from_user_compat_to_kern(struct msghdr kmsg, struct sock sk,
1da177e4 LT	139	unsigned char *stackbuf, int stackbuf_size)
	140	{
	141	struct compat_cmsghdr __user *ucmsg;
	142	struct cmsghdr kcmsg, kcmsg_base;
	143	compat_size_t ucmlen;
	144	__kernel_size_t kcmlen, tmp;
8920e8f9	145	int err = -EFAULT;
1da177e4 LT	146
	147	kcmlen = 0;
	148	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	149	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
	150	while(ucmsg != NULL) {
	151	if(get_user(ucmlen, &ucmsg->cmsg_len))
	152	return -EFAULT;
	153
	154	/* Catch bogons. */
	155	if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
	156	return -EINVAL;
	157
	158	tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
	159	CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9	160	tmp = CMSG_ALIGN(tmp);
1da177e4 LT	161	kcmlen += tmp;
	162	ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	163	}
	164	if(kcmlen == 0)
	165	return -EINVAL;
	166
	167	/* The kcmlen holds the 64-bit version of the control length.
	168	* It may not be modified as we do not stick it into the kmsg
	169	* until we have successfully copied over all of the data
	170	* from the user.
	171	*/
8920e8f9 AV	172	if (kcmlen > stackbuf_size)
	173	kcmsg_base = kcmsg = sock_kmalloc(sk, kcmlen, GFP_KERNEL);
	174	if (kcmsg == NULL)
1da177e4 LT	175	return -ENOBUFS;
	176
	177	/* Now copy them over neatly. */
	178	memset(kcmsg, 0, kcmlen);
	179	ucmsg = CMSG_COMPAT_FIRSTHDR(kmsg);
	180	while(ucmsg != NULL) {
8920e8f9 AV	181	if (__get_user(ucmlen, &ucmsg->cmsg_len))
	182	goto Efault;
	183	if (!CMSG_COMPAT_OK(ucmlen, ucmsg, kmsg))
	184	goto Einval;
1da177e4 LT	185	tmp = ((ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg))) +
1da177e4 LT	186	CMSG_ALIGN(sizeof(struct cmsghdr)));
8920e8f9 AV	187	if ((char )kcmsg_base + kcmlen - (char )kcmsg < CMSG_ALIGN(tmp))
8920e8f9 AV	188	goto Einval;
1da177e4	189	kcmsg->cmsg_len = tmp;
8920e8f9 AV	190	tmp = CMSG_ALIGN(tmp);
	191	if (__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level) \|\|
	192	__get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type) \|\|
	193	copy_from_user(CMSG_DATA(kcmsg),
	194	CMSG_COMPAT_DATA(ucmsg),
	195	(ucmlen - CMSG_COMPAT_ALIGN(sizeof(*ucmsg)))))
	196	goto Efault;
1da177e4 LT	197
1da177e4 LT	198	/* Advance. */
8920e8f9	199	kcmsg = (struct cmsghdr )((char )kcmsg + tmp);
1da177e4 LT	200	ucmsg = cmsg_compat_nxthdr(kmsg, ucmsg, ucmlen);
	201	}
	202
	203	/* Ok, looks like we made it. Hook it up and return success. */
	204	kmsg->msg_control = kcmsg_base;
	205	kmsg->msg_controllen = kcmlen;
	206	return 0;
	207
8920e8f9 AV	208	Einval:
	209	err = -EINVAL;
	210	Efault:
	211	if (kcmsg_base != (struct cmsghdr *)stackbuf)
	212	sock_kfree_s(sk, kcmsg_base, kcmlen);
	213	return err;
1da177e4 LT	214	}
	215
	216	int put_cmsg_compat(struct msghdr kmsg, int level, int type, int len, void data)
	217	{
	218	struct compat_timeval ctv;
	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(struct compat_timeval);
	234	}
	235
	236	cmlen = CMSG_COMPAT_LEN(len);
	237	if(kmsg->msg_controllen < cmlen) {
	238	kmsg->msg_flags \|= MSG_CTRUNC;
	239	cmlen = kmsg->msg_controllen;
	240	}
	241	cmhdr.cmsg_level = level;
	242	cmhdr.cmsg_type = type;
	243	cmhdr.cmsg_len = cmlen;
	244
	245	if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
	246	return -EFAULT;
	247	if(copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
	248	return -EFAULT;
	249	cmlen = CMSG_COMPAT_SPACE(len);
	250	kmsg->msg_control += cmlen;
	251	kmsg->msg_controllen -= cmlen;
	252	return 0;
	253	}
	254
	255	void scm_detach_fds_compat(struct msghdr kmsg, struct scm_cookie scm)
	256	{
	257	struct compat_cmsghdr __user cm = (struct compat_cmsghdr __user ) kmsg->msg_control;
	258	int fdmax = (kmsg->msg_controllen - sizeof(struct compat_cmsghdr)) / sizeof(int);
	259	int fdnum = scm->fp->count;
	260	struct file **fp = scm->fp->fp;
	261	int __user *cmfptr;
	262	int err = 0, i;
	263
	264	if (fdnum < fdmax)
	265	fdmax = fdnum;
	266
	267	for (i = 0, cmfptr = (int __user *) CMSG_COMPAT_DATA(cm); i < fdmax; i++, cmfptr++) {
	268	int new_fd;
	269	err = security_file_receive(fp[i]);
	270	if (err)
	271	break;
	272	err = get_unused_fd();
	273	if (err < 0)
	274	break;
	275	new_fd = err;
	276	err = put_user(new_fd, cmfptr);
	277	if (err) {
278	put_unused_fd(new_fd);
279	break;
280	}
281	/* Bump the usage count and install the file. */
282	get_file(fp[i]);
283	fd_install(new_fd, fp[i]);
284	}
285
286	if (i > 0) {
287	int cmlen = CMSG_COMPAT_LEN(i * sizeof(int));
288	if (!err)
289	err = put_user(SOL_SOCKET, &cm->cmsg_level);
290	if (!err)
291	err = put_user(SCM_RIGHTS, &cm->cmsg_type);
292	if (!err)
293	err = put_user(cmlen, &cm->cmsg_len);
294	if (!err) {
295	cmlen = CMSG_COMPAT_SPACE(i * sizeof(int));
296	kmsg->msg_control += cmlen;
297	kmsg->msg_controllen -= cmlen;
298	}
299	}
300	if (i < fdnum)
301	kmsg->msg_flags \|= MSG_CTRUNC;
302
303	/*
304	* All of the files that fit in the message have had their
305	* usage counts incremented, so we just free the list.
306	*/
307	__scm_destroy(scm);
308	}
309
310	/*
311	* For now, we assume that the compatibility and native version
312	* of struct ipt_entry are the same - sfr. FIXME
313	*/
314	struct compat_ipt_replace {
315	char name[IPT_TABLE_MAXNAMELEN];
316	u32 valid_hooks;
317	u32 num_entries;
318	u32 size;
319	u32 hook_entry[NF_IP_NUMHOOKS];
320	u32 underflow[NF_IP_NUMHOOKS];
321	u32 num_counters;
322	compat_uptr_t counters; /* struct ipt_counters * */
323	struct ipt_entry entries[0];
324	};
325
326	static int do_netfilter_replace(int fd, int level, int optname,
327	char __user *optval, int optlen)
328	{
329	struct compat_ipt_replace __user *urepl;
330	struct ipt_replace __user *repl_nat;
331	char name[IPT_TABLE_MAXNAMELEN];
332	u32 origsize, tmp32, num_counters;
333	unsigned int repl_nat_size;
334	int ret;
335	int i;
336	compat_uptr_t ucntrs;
337
338	urepl = (struct compat_ipt_replace __user *)optval;
339	if (get_user(origsize, &urepl->size))
340	return -EFAULT;
341
342	/* Hack: Causes ipchains to give correct error msg --RR */
343	if (optlen != sizeof(*urepl) + origsize)
344	return -ENOPROTOOPT;
345
346	/* XXX Assumes that size of ipt_entry is the same both in
347	* native and compat environments.
348	*/
349	repl_nat_size = sizeof(*repl_nat) + origsize;
350	repl_nat = compat_alloc_user_space(repl_nat_size);
351
352	ret = -EFAULT;
353	if (put_user(origsize, &repl_nat->size))
354	goto out;
355
356	if (!access_ok(VERIFY_READ, urepl, optlen) \|\|
357	!access_ok(VERIFY_WRITE, repl_nat, optlen))
358	goto out;
359
360	if (__copy_from_user(name, urepl->name, sizeof(urepl->name)) \|\|
361	__copy_to_user(repl_nat->name, name, sizeof(repl_nat->name)))
362	goto out;
363
364	if (__get_user(tmp32, &urepl->valid_hooks) \|\|
365	__put_user(tmp32, &repl_nat->valid_hooks))
366	goto out;
367
368	if (__get_user(tmp32, &urepl->num_entries) \|\|
369	__put_user(tmp32, &repl_nat->num_entries))
370	goto out;
371
372	if (__get_user(num_counters, &urepl->num_counters) \|\|
373	__put_user(num_counters, &repl_nat->num_counters))
374	goto out;
375
376	if (__get_user(ucntrs, &urepl->counters) \|\|
377	__put_user(compat_ptr(ucntrs), &repl_nat->counters))
378	goto out;
379
380	if (__copy_in_user(&repl_nat->entries[0],
381	&urepl->entries[0],
382	origsize))
383	goto out;
384
385	for (i = 0; i < NF_IP_NUMHOOKS; i++) {
386	if (__get_user(tmp32, &urepl->hook_entry[i]) \|\|
387	__put_user(tmp32, &repl_nat->hook_entry[i]) \|\|
388	__get_user(tmp32, &urepl->underflow[i]) \|\|
389	__put_user(tmp32, &repl_nat->underflow[i]))
390	goto out;
391	}
392
393	/*
394	* Since struct ipt_counters just contains two u_int64_t members
395	* we can just do the access_ok check here and pass the (converted)
396	* pointer into the standard syscall. We hope that the pointer is
397	* not misaligned ...
398	*/
399	if (!access_ok(VERIFY_WRITE, compat_ptr(ucntrs),
400	num_counters * sizeof(struct ipt_counters)))
401	goto out;
402
403
404	ret = sys_setsockopt(fd, level, optname,
405	(char __user *)repl_nat, repl_nat_size);
406
407	out:
408	return ret;
409	}
410
411	/*
412	* A struct sock_filter is architecture independent.
413	*/
414	struct compat_sock_fprog {
415	u16 len;
416	compat_uptr_t filter; /* struct sock_filter * */
417	};
418
3fdadf7d	419	static int do_set_attach_filter(struct socket *sock, int level, int optname,
1da177e4 LT	420	char __user *optval, int optlen)
	421	{
	422	struct compat_sock_fprog __user fprog32 = (struct compat_sock_fprog __user )optval;
	423	struct sock_fprog __user *kfprog = compat_alloc_user_space(sizeof(struct sock_fprog));
	424	compat_uptr_t ptr;
	425	u16 len;
	426
	427	if (!access_ok(VERIFY_READ, fprog32, sizeof(*fprog32)) \|\|
	428	!access_ok(VERIFY_WRITE, kfprog, sizeof(struct sock_fprog)) \|\|
	429	__get_user(len, &fprog32->len) \|\|
	430	__get_user(ptr, &fprog32->filter) \|\|
	431	__put_user(len, &kfprog->len) \|\|
	432	__put_user(compat_ptr(ptr), &kfprog->filter))
	433	return -EFAULT;
	434
3fdadf7d	435	return sock_setsockopt(sock, level, optname, (char __user *)kfprog,
1da177e4 LT	436	sizeof(struct sock_fprog));
	437	}
	438
3fdadf7d DM	439	static int do_set_sock_timeout(struct socket *sock, int level,
3fdadf7d DM	440	int optname, char __user *optval, int optlen)
1da177e4 LT	441	{
	442	struct compat_timeval __user up = (struct compat_timeval __user ) optval;
	443	struct timeval ktime;
	444	mm_segment_t old_fs;
	445	int err;
	446
	447	if (optlen < sizeof(*up))
	448	return -EINVAL;
	449	if (!access_ok(VERIFY_READ, up, sizeof(*up)) \|\|
	450	__get_user(ktime.tv_sec, &up->tv_sec) \|\|
	451	__get_user(ktime.tv_usec, &up->tv_usec))
	452	return -EFAULT;
	453	old_fs = get_fs();
	454	set_fs(KERNEL_DS);
3fdadf7d	455	err = sock_setsockopt(sock, level, optname, (char *) &ktime, sizeof(ktime));
1da177e4 LT	456	set_fs(old_fs);
	457
	458	return err;
	459	}
	460
3fdadf7d DM	461	static int compat_sock_setsockopt(struct socket *sock, int level, int optname,
	462	char __user *optval, int optlen)
	463	{
	464	if (optname == SO_ATTACH_FILTER)
	465	return do_set_attach_filter(sock, level, optname,
	466	optval, optlen);
	467	if (optname == SO_RCVTIMEO \|\| optname == SO_SNDTIMEO)
	468	return do_set_sock_timeout(sock, level, optname, optval, optlen);
	469
	470	return sock_setsockopt(sock, level, optname, optval, optlen);
	471	}
	472
1da177e4 LT	473	asmlinkage long compat_sys_setsockopt(int fd, int level, int optname,
	474	char __user *optval, int optlen)
	475	{
3fdadf7d DM	476	int err;
	477	struct socket *sock;
	478
1da177e4 LT	479	/* SO_SET_REPLACE seems to be the same in all levels */
	480	if (optname == IPT_SO_SET_REPLACE)
	481	return do_netfilter_replace(fd, level, optname,
	482	optval, optlen);
1da177e4	483
3fdadf7d DM	484	if (optlen < 0)
	485	return -EINVAL;
	486
	487	if ((sock = sockfd_lookup(fd, &err))!=NULL)
	488	{
	489	err = security_socket_setsockopt(sock,level,optname);
	490	if (err) {
	491	sockfd_put(sock);
	492	return err;
	493	}
	494
	495	if (level == SOL_SOCKET)
	496	err = compat_sock_setsockopt(sock, level,
	497	optname, optval, optlen);
	498	else if (sock->ops->compat_setsockopt)
	499	err = sock->ops->compat_setsockopt(sock, level,
	500	optname, optval, optlen);
	501	else
	502	err = sock->ops->setsockopt(sock, level,
	503	optname, optval, optlen);
	504	sockfd_put(sock);
	505	}
	506	return err;
1da177e4 LT	507	}
1da177e4 LT	508
3fdadf7d	509	static int do_get_sock_timeout(struct socket *sock, int level, int optname,
1da177e4 LT	510	char __user optval, int __user optlen)
	511	{
	512	struct compat_timeval __user *up;
	513	struct timeval ktime;
	514	mm_segment_t old_fs;
	515	int len, err;
	516
	517	up = (struct compat_timeval __user *) optval;
	518	if (get_user(len, optlen))
	519	return -EFAULT;
	520	if (len < sizeof(*up))
	521	return -EINVAL;
	522	len = sizeof(ktime);
	523	old_fs = get_fs();
	524	set_fs(KERNEL_DS);
3fdadf7d	525	err = sock_getsockopt(sock, level, optname, (char *) &ktime, &len);
1da177e4 LT	526	set_fs(old_fs);
	527
	528	if (!err) {
	529	if (put_user(sizeof(*up), optlen) \|\|
	530	!access_ok(VERIFY_WRITE, up, sizeof(*up)) \|\|
	531	__put_user(ktime.tv_sec, &up->tv_sec) \|\|
	532	__put_user(ktime.tv_usec, &up->tv_usec))
	533	err = -EFAULT;
	534	}
	535	return err;
	536	}
	537
3fdadf7d	538	static int compat_sock_getsockopt(struct socket *sock, int level, int optname,
1da177e4 LT	539	char __user optval, int __user optlen)
1da177e4 LT	540	{
3fdadf7d DM	541	if (optname == SO_RCVTIMEO \|\| optname == SO_SNDTIMEO)
	542	return do_get_sock_timeout(sock, level, optname, optval, optlen);
	543	return sock_getsockopt(sock, level, optname, optval, optlen);
1da177e4 LT	544	}
1da177e4 LT	545
3fdadf7d DM	546	asmlinkage long compat_sys_getsockopt(int fd, int level, int optname,
	547	char __user optval, int __user optlen)
	548	{
	549	int err;
	550	struct socket *sock;
	551
	552	if ((sock = sockfd_lookup(fd, &err))!=NULL)
	553	{
	554	err = security_socket_getsockopt(sock, level,
	555	optname);
	556	if (err) {
	557	sockfd_put(sock);
	558	return err;
	559	}
	560
	561	if (level == SOL_SOCKET)
	562	err = compat_sock_getsockopt(sock, level,
	563	optname, optval, optlen);
	564	else if (sock->ops->compat_getsockopt)
	565	err = sock->ops->compat_getsockopt(sock, level,
	566	optname, optval, optlen);
	567	else
	568	err = sock->ops->getsockopt(sock, level,
	569	optname, optval, optlen);
	570	sockfd_put(sock);
	571	}
	572	return err;
	573	}
1da177e4 LT	574	/* Argument list sizes for compat_sys_socketcall */
	575	#define AL(x) ((x) * sizeof(u32))
	576	static unsigned char nas[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
	577	AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
	578	AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
	579	#undef AL
	580
	581	asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned flags)
	582	{
	583	return sys_sendmsg(fd, (struct msghdr __user *)msg, flags \| MSG_CMSG_COMPAT);
	584	}
	585
	586	asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
	587	{
	588	return sys_recvmsg(fd, (struct msghdr __user *)msg, flags \| MSG_CMSG_COMPAT);
	589	}
	590
	591	asmlinkage long compat_sys_socketcall(int call, u32 __user *args)
	592	{
	593	int ret;
	594	u32 a[6];
	595	u32 a0, a1;
	596
	597	if (call < SYS_SOCKET \|\| call > SYS_RECVMSG)
	598	return -EINVAL;
	599	if (copy_from_user(a, args, nas[call]))
	600	return -EFAULT;
	601	a0 = a[0];
	602	a1 = a[1];
	603
	604	switch(call) {
	605	case SYS_SOCKET:
	606	ret = sys_socket(a0, a1, a[2]);
	607	break;
	608	case SYS_BIND:
	609	ret = sys_bind(a0, compat_ptr(a1), a[2]);
	610	break;
	611	case SYS_CONNECT:
	612	ret = sys_connect(a0, compat_ptr(a1), a[2]);
	613	break;
	614	case SYS_LISTEN:
	615	ret = sys_listen(a0, a1);
	616	break;
	617	case SYS_ACCEPT:
	618	ret = sys_accept(a0, compat_ptr(a1), compat_ptr(a[2]));
	619	break;
	620	case SYS_GETSOCKNAME:
	621	ret = sys_getsockname(a0, compat_ptr(a1), compat_ptr(a[2]));
	622	break;
	623	case SYS_GETPEERNAME:
	624	ret = sys_getpeername(a0, compat_ptr(a1), compat_ptr(a[2]));
	625	break;
	626	case SYS_SOCKETPAIR:
	627	ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
	628	break;
	629	case SYS_SEND:
	630	ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
	631	break;
	632	case SYS_SENDTO:
	633	ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
	634	break;
	635	case SYS_RECV:
	636	ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
	637	break;
638	case SYS_RECVFROM:
639	ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
640	break;
641	case SYS_SHUTDOWN:
642	ret = sys_shutdown(a0,a1);
643	break;
644	case SYS_SETSOCKOPT:
645	ret = compat_sys_setsockopt(a0, a1, a[2],
646	compat_ptr(a[3]), a[4]);
647	break;
648	case SYS_GETSOCKOPT:
649	ret = compat_sys_getsockopt(a0, a1, a[2],
650	compat_ptr(a[3]), compat_ptr(a[4]));
651	break;
652	case SYS_SENDMSG:
653	ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
654	break;
655	case SYS_RECVMSG:
656	ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
657	break;
658	default:
659	ret = -EINVAL;
660	break;
661	}
662	return ret;
663	}