uipc_syscalls.c

早期freebsd实现

/*
 * Copyright (c) 1982, 1986, 1989, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)uipc_syscalls.c	8.4 (Berkeley) 2/21/94
 */

#include <sys/param.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#ifdef KTRACE
#include <sys/ktrace.h>
#endif

/*
 * System call interface to the socket abstraction.
 */
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
#define COMPAT_OLDSOCK
#endif

extern	struct fileops socketops;

struct socket_args {
	int	domain;
	int	type;
	int	protocol;
};
socket(p, uap, retval)
	struct proc *p;
	register struct socket_args *uap;
	int *retval;
{
	struct filedesc *fdp = p->p_fd;
	struct socket *so;
	struct file *fp;
	int fd, error;

	if (error = falloc(p, &fp, &fd))
		return (error);
	fp->f_flag = FREAD|FWRITE;
	fp->f_type = DTYPE_SOCKET;
	fp->f_ops = &socketops;
	if (error = socreate(uap->domain, &so, uap->type, uap->protocol)) {
		fdp->fd_ofiles[fd] = 0;
		ffree(fp);
	} else {
		fp->f_data = (caddr_t)so;
		*retval = fd;
	}
	return (error);
}

struct bind_args {
	int	s;
	caddr_t	name;
	int	namelen;
};
/* ARGSUSED */
bind(p, uap, retval)
	struct proc *p;
	register struct bind_args *uap;
	int *retval;
{
	struct file *fp;
	struct mbuf *nam;
	int error;

	if (error = getsock(p->p_fd, uap->s, &fp))
		return (error);
	if (error = sockargs(&nam, uap->name, uap->namelen, MT_SONAME))
		return (error);
	error = sobind((struct socket *)fp->f_data, nam);
	m_freem(nam);
	return (error);
}

struct listen_args {
	int	s;
	int	backlog;
};
/* ARGSUSED */
listen(p, uap, retval)
	struct proc *p;
	register struct listen_args *uap;
	int *retval;
{
	struct file *fp;
	int error;

	if (error = getsock(p->p_fd, uap->s, &fp))
		return (error);
	return (solisten((struct socket *)fp->f_data, uap->backlog));
}

struct accept_args {
	int	s;
	caddr_t	name;
	int	*anamelen;
#ifdef COMPAT_OLDSOCK
	int	compat_43;	/* pseudo */
#endif
};

#ifdef COMPAT_OLDSOCK
accept(p, uap, retval)
	struct proc *p;
	struct accept_args *uap;
	int *retval;
{

	uap->compat_43 = 0;
	return (accept1(p, uap, retval));
}

oaccept(p, uap, retval)
	struct proc *p;
	struct accept_args *uap;
	int *retval;
{

	uap->compat_43 = 1;
	return (accept1(p, uap, retval));
}
#else /* COMPAT_OLDSOCK */

#define	accept1	accept
#endif

accept1(p, uap, retval)
	struct proc *p;
	register struct accept_args *uap;
	int *retval;
{
	struct file *fp;
	struct mbuf *nam;
	int namelen, error, s;
	register struct socket *so;

	if (uap->name && (error = copyin((caddr_t)uap->anamelen,
	    (caddr_t)&namelen, sizeof (namelen))))
		return (error);
	if (error = getsock(p->p_fd, uap->s, &fp))
		return (error);
	s = splnet();
	so = (struct socket *)fp->f_data;
	if ((so->so_options & SO_ACCEPTCONN) == 0) {
		splx(s);
		return (EINVAL);
	}
	if ((so->so_state & SS_NBIO) && so->so_qlen == 0) {
		splx(s);
		return (EWOULDBLOCK);
	}
	while (so->so_qlen == 0 && so->so_error == 0) {
		if (so->so_state & SS_CANTRCVMORE) {
			so->so_error = ECONNABORTED;
			break;
		}
		if (error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH,
		    netcon, 0)) {
			splx(s);
			return (error);
		}
	}
	if (so->so_error) {
		error = so->so_error;
		so->so_error = 0;
		splx(s);
		return (error);
	}
	if (error = falloc(p, &fp, retval)) {
		splx(s);
		return (error);
	}
	{ struct socket *aso = so->so_q;
	  if (soqremque(aso, 1) == 0)
		panic("accept");
	  so = aso;
	}
	fp->f_type = DTYPE_SOCKET;
	fp->f_flag = FREAD|FWRITE;
	fp->f_ops = &socketops;
	fp->f_data = (caddr_t)so;
	nam = m_get(M_WAIT, MT_SONAME);
	(void) soaccept(so, nam);
	if (uap->name) {
#ifdef COMPAT_OLDSOCK
		if (uap->compat_43)
			mtod(nam, struct osockaddr *)->sa_family =
			    mtod(nam, struct sockaddr *)->sa_family;
#endif
		if (namelen > nam->m_len)
			namelen = nam->m_len;
		/* SHOULD COPY OUT A CHAIN HERE */
		if ((error = copyout(mtod(nam, caddr_t), (caddr_t)uap->name,
		    (u_int)namelen)) == 0)
			error = copyout((caddr_t)&namelen,
			    (caddr_t)uap->anamelen, sizeof (*uap->anamelen));
	}
	m_freem(nam);
	splx(s);
	return (error);
}

struct connect_args {
	int	s;
	caddr_t	name;
	int	namelen;
};
/* ARGSUSED */
connect(p, uap, retval)
	struct proc *p;
	register struct connect_args *uap;
	int *retval;
{
	struct file *fp;
	register struct socket *so;
	struct mbuf *nam;
	int error, s;

	if (error = getsock(p->p_fd, uap->s, &fp))
		return (error);
	so = (struct socket *)fp->f_data;
	if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING))
		return (EALREADY);
	if (error = sockargs(&nam, uap->name, uap->namelen, MT_SONAME))
		return (error);
	error = soconnect(so, nam);
	if (error)
		goto bad;
	if ((so->so_state & SS_NBIO) && (so->so_state & SS_ISCONNECTING)) {
		m_freem(nam);
		return (EINPROGRESS);
	}
	s = splnet();
	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0)
		if (error = tsleep((caddr_t)&so->so_timeo, PSOCK | PCATCH,
		    netcon, 0))
			break;
	if (error == 0) {
		error = so->so_error;
		so->so_error = 0;
	}
	splx(s);
bad:
	so->so_state &= ~SS_ISCONNECTING;
	m_freem(nam);
	if (error == ERESTART)
		error = EINTR;
	return (error);
}

struct socketpair_args {
	int	domain;
	int	type;
	int	protocol;
	int	*rsv;
};
socketpair(p, uap, retval)
	struct proc *p;
	register struct socketpair_args *uap;
	int retval[];
{
	register struct filedesc *fdp = p->p_fd;
	struct file *fp1, *fp2;
	struct socket *so1, *so2;
	int fd, error, sv[2];

	if (error = socreate(uap->domain, &so1, uap->type, uap->protocol))
		return (error);
	if (error = socreate(uap->domain, &so2, uap->type, uap->protocol))
		goto free1;
	if (error = falloc(p, &fp1, &fd))
		goto free2;
	sv[0] = fd;
	fp1->f_flag = FREAD|FWRITE;
	fp1->f_type = DTYPE_SOCKET;
	fp1->f_ops = &socketops;
	fp1->f_data = (caddr_t)so1;
	if (error = falloc(p, &fp2, &fd))
		goto free3;
	fp2->f_flag = FREAD|FWRITE;
	fp2->f_type = DTYPE_SOCKET;
	fp2->f_ops = &socketops;
	fp2->f_data = (caddr_t)so2;
	sv[1] = fd;
	if (error = soconnect2(so1, so2))
		goto free4;
	if (uap->type == SOCK_DGRAM) {
		/*
		 * Datagram socket connection is asymmetric.
		 */
		 if (error = soconnect2(so2, so1))
			goto free4;
	}
	error = copyout((caddr_t)sv, (caddr_t)uap->rsv, 2 * sizeof (int));
	retval[0] = sv[0];		/* XXX ??? */
	retval[1] = sv[1];		/* XXX ??? */
	return (error);
free4:
	ffree(fp2);
	fdp->fd_ofiles[sv[1]] = 0;
free3:
	ffree(fp1);
	fdp->fd_ofiles[sv[0]] = 0;
free2:
	(void)soclose(so2);
free1:
	(void)soclose(so1);
	return (error);
}

struct sendto_args {
	int	s;
	caddr_t	buf;
	size_t	len;
	int	flags;
	caddr_t	to;
	int	tolen;
};
sendto(p, uap, retval)
	struct proc *p;
	register struct sendto_args *uap;
	int *retval;
{
	struct msghdr msg;
	struct iovec aiov;

	msg.msg_name = uap->to;
	msg.msg_namelen = uap->tolen;
	msg.msg_iov = &aiov;
	msg.msg_iovlen = 1;
	msg.msg_control = 0;
#ifdef COMPAT_OLDSOCK
	msg.msg_flags = 0;
#endif
	aiov.iov_base = uap->buf;
	aiov.iov_len = uap->len;
	return (sendit(p, uap->s, &msg, uap->flags, retval));
}

#ifdef COMPAT_OLDSOCK
struct osend_args {
	int	s;
	caddr_t	buf;
	int	len;
	int	flags;
};
osend(p, uap, retval)
	struct proc *p;
	register struct osend_args *uap;
	int *retval;
{
	struct msghdr msg;
	struct iovec aiov;

	msg.msg_name = 0;
	msg.msg_namelen = 0;
	msg.msg_iov = &aiov;
	msg.msg_iovlen = 1;
	aiov.iov_base = uap->buf;
	aiov.iov_len = uap->len;
	msg.msg_control = 0;
	msg.msg_flags = 0;
	return (sendit(p, uap->s, &msg, uap->flags, retval));
}

#define MSG_COMPAT	0x8000
struct osendmsg_args {
	int	s;
	caddr_t	msg;
	int	flags;
};
osendmsg(p, uap, retval)
	struct proc *p;
	register struct osendmsg_args *uap;
	int *retval;
{
	struct msghdr msg;
	struct iovec aiov[UIO_SMALLIOV], *iov;
	int error;

	if (error = copyin(uap->msg, (caddr_t)&msg, sizeof (struct omsghdr)))
		return (error);
	if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
		if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
			return (EMSGSIZE);
		MALLOC(iov, struct iovec *,
		      sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV, 
		      M_WAITOK);
	} else
		iov = aiov;
	if (error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov,
	    (unsigned)(msg.msg_iovlen * sizeof (struct iovec))))
		goto done;
	msg.msg_flags = MSG_COMPAT;
	msg.msg_iov = iov;
	error = sendit(p, uap->s, &msg, uap->flags, retval);
done:
	if (iov != aiov)
		FREE(iov, M_IOV);
	return (error);
}
#endif

struct sendmsg_args {
	int	s;
	caddr_t	msg;
	int	flags;
};
sendmsg(p, uap, retval)
	struct proc *p;
	register struct sendmsg_args *uap;
	int *retval;
{
	struct msghdr msg;
	struct iovec aiov[UIO_SMALLIOV], *iov;
	int error;

	if (error = copyin(uap->msg, (caddr_t)&msg, sizeof (msg)))
		return (error);
	if ((u_int)msg.msg_iovlen >= UIO_SMALLIOV) {
		if ((u_int)msg.msg_iovlen >= UIO_MAXIOV)
			return (EMSGSIZE);
		MALLOC(iov, struct iovec *,
		       sizeof(struct iovec) * (u_int)msg.msg_iovlen, M_IOV,
		       M_WAITOK);
	} else
		iov = aiov;
	if (msg.msg_iovlen &&
	    (error = copyin((caddr_t)msg.msg_iov, (caddr_t)iov,
	    (unsigned)(msg.msg_iovlen * sizeof (struct iovec)))))
		goto done;
	msg.msg_iov = iov;
#ifdef COMPAT_OLDSOCK
	msg.msg_flags = 0;
#endif
	error = sendit(p, uap->s, &msg, uap->flags, retval);
done:
	if (iov != aiov)
		FREE(iov, M_IOV);
	return (error);
}

sendit(p, s, mp, flags, retsize)
	register struct proc *p;
	int s;
	register struct msghdr *mp;
	int flags, *retsize;
{
	struct file *fp;
	struct uio auio;
	register struct iovec *iov;
	register int i;
	struct mbuf *to, *control;
	int len, error;
#ifdef KTRACE
	struct iovec *ktriov = NULL;
#endif
	
	if (error = getsock(p->p_fd, s, &fp))
		return (error);
	auio.uio_iov = mp->msg_iov;
	auio.uio_iovcnt = mp->msg_iovlen;
	auio.uio_segflg = UIO_USERSPACE;
	auio.uio_rw = UIO_WRITE;
	auio.uio_procp = p;
	auio.uio_offset = 0;			/* XXX */
	auio.uio_resid = 0;
	iov = mp->msg_iov;
	for (i = 0; i < mp->msg_iovlen; i++, iov++) {
		if (iov->iov_len < 0)
			return (EINVAL);
		if ((auio.uio_resid += iov->iov_len) < 0)
			return (EINVAL);
	}
	if (mp->msg_name) {
		if (error = sockargs(&to, mp->msg_name, mp->msg_namelen,
		    MT_SONAME))
			return (error);
	} else
		to = 0;
	if (mp->msg_control) {
		if (mp->msg_controllen < sizeof(struct cmsghdr)
#ifdef COMPAT_OLDSOCK
		    && mp->msg_flags != MSG_COMPAT
#endif
		) {
			error = EINVAL;
			goto bad;
		}
		if (error = sockargs(&control, mp->msg_control,
		    mp->msg_controllen, MT_CONTROL))
			goto bad;
#ifdef COMPAT_OLDSOCK
		if (mp->msg_flags == MSG_COMPAT) {
			register struct cmsghdr *cm;

			M_PREPEND(control, sizeof(*cm), M_WAIT);
			if (control == 0) {
				error = ENOBUFS;
				goto bad;
			} else {
				cm = mtod(control, struct cmsghdr *);
				cm->cmsg_len = control->m_len;
				cm->cmsg_level = SOL_SOCKET;
				cm->cmsg_type = SCM_RIGHTS;
			}
		}
#endif
	} else
		control = 0;
#ifdef KTRACE
	if (KTRPOINT(p, KTR_GENIO)) {
		int iovlen = auio.uio_iovcnt * sizeof (struct iovec);

		MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
		bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
	}
#endif
	len = auio.uio_resid;
	if (error = sosend((struct socket *)fp->f_data, to, &auio,
	    (struct mbuf *)0, control, flags)) {
		if (auio.uio_resid != len && (error == ERESTART ||
		    error == EINTR || error == EWOULDBLOCK))
			error = 0;
		if (error == EPIPE)
			psignal(p, SIGPIPE);
	}
	if (error == 0)
		*retsize = len - auio.uio_resid;
#ifdef KTRACE
	if (ktriov != NULL) {
		if (error == 0)
			ktrgenio(p->p_tracep, s, UIO_WRITE,
				ktriov, *retsize, error);
		FREE(ktriov, M_TEMP);
	}
#endif
bad:
	if (to)
		m_freem(to);
	return (error);
}

struct recvfrom_args {
	int	s;
	caddr_t	buf;
	size_t	len;
	int	flags;
	caddr_t	from;
	int	*fromlenaddr;
};

#ifdef COMPAT_OLDSOCK
orecvfrom(p, uap, retval)
	struct proc *p;
	struct recvfrom_args *uap;
	int *retval;
{

	uap->flags |= MSG_COMPAT;
	return (recvfrom(p, uap, retval));
}
#endif

recvfrom(p, uap, retval)
	struct proc *p;
	register struct recvfrom_args *uap;
	int *retval;
{
	struct msghdr msg;
	struct iovec aiov;