raw_cb.c

很好的一个嵌入式linux平台下的bootloader

/* $Id: raw_cb.c,v 1.2 1996/01/16 14:21:58 chris Exp $ */
/*
 * Copyright (c) 1980, 1986 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.
 *
 *	@(#)raw_cb.c	7.11 (Berkeley) 6/28/90
 */

#include "param.h"
#include "systm.h"
#include "mbuf.h"
#include "socket.h"
#include "socketvar.h"
#include "domain.h"
#include "protosw.h"
#include "errno.h"

#include "if.h"
#include "route.h"
#include "raw_cb.h"
#include "../netinet/in.h"

#include "machine/mtpr.h"

/*
 * Routines to manage the raw protocol control blocks. 
 *
 * TODO:
 *	hash lookups by protocol family/protocol + address family
 *	take care of unique address problems per AF?
 *	redo address binding to allow wildcards
 */

#ifdef PROM
const u_long	raw_sendspace = RAWSNDQ;
const u_long	raw_recvspace = RAWRCVQ;
#else
u_long	raw_sendspace = RAWSNDQ;
u_long	raw_recvspace = RAWRCVQ;
#endif

/*
 * Allocate a control block and a nominal amount
 * of buffer space for the socket.
 */
raw_attach(so, proto)
	register struct socket *so;
	int proto;
{
	register struct rawcb *rp = sotorawcb(so);
	int error;

	/*
	 * It is assumed that raw_attach is called
	 * after space has been allocated for the
	 * rawcb.
	 */
	if (rp == 0)
		return (ENOBUFS);
	if (error = soreserve(so, raw_sendspace, raw_recvspace))
		return (error);
	rp->rcb_socket = so;
	rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
	rp->rcb_proto.sp_protocol = proto;
	insque(rp, &rawcb);
	return (0);
}

/*
 * Detach the raw connection block and discard
 * socket resources.
 */
raw_detach(rp)
	register struct rawcb *rp;
{
	struct socket *so = rp->rcb_socket;

	so->so_pcb = 0;
	sofree(so);
	remque(rp);
#ifdef notdef
	if (rp->rcb_laddr)
		m_freem(dtom(rp->rcb_laddr));
	rp->rcb_laddr = 0;
#endif
	free((caddr_t)(rp), M_PCB);
}

/*
 * Disconnect and possibly release resources.
 */
raw_disconnect(rp)
	struct rawcb *rp;
{

#ifdef notdef
	if (rp->rcb_faddr)
		m_freem(dtom(rp->rcb_faddr));
	rp->rcb_faddr = 0;
#endif
	if (rp->rcb_socket->so_state & SS_NOFDREF)
		raw_detach(rp);
}

#ifdef notdef
raw_bind(so, nam)
	register struct socket *so;
	struct mbuf *nam;
{
	struct sockaddr *addr = mtod(nam, struct sockaddr *);
	register struct rawcb *rp;

	if (ifnet == 0)
		return (EADDRNOTAVAIL);
	rp = sotorawcb(so);
	nam = m_copym(nam, 0, M_COPYALL, M_WAITOK);
	rp->rcb_laddr = mtod(nam, struct sockaddr *);
	return (0);
}
#endif