Ultrix-3.1/sys/net/raw_ip.c

/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * Copyright (c) 1982 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 * SCCSID: @(#)raw_ip.c	2.0	5/28/85
 *	Based on: @(#)raw_ip.c	6.6 (Berkeley) 6/8/85
 */

#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <errno.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>

/*
 * Raw interface to IP protocol.
 */

struct	sockaddr_in ripdst = { AF_INET };
struct	sockaddr_in ripsrc = { AF_INET };
struct	sockproto ripproto = { PF_INET };
/*
 * Setup generic address and protocol structures
 * for raw_input routine, then pass them along with
 * mbuf chain.
 */
rip_input(m)
	struct mbuf *m;
{
#ifndef	pdp11
	register struct ip *ip = mtod(m, struct ip *);
#else	pdp11
	register struct ip *ip;

	MAPSAVE();
	ip = mtod(m, struct ip *);
#endif	pdp11

	ripproto.sp_protocol = ip->ip_p;
	ripdst.sin_addr = ip->ip_dst;
	ripsrc.sin_addr = ip->ip_src;
#ifdef	pdp11
	MAPREST();
#endif	pdp11
	raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
	  (struct sockaddr *)&ripdst);
}

/*
 * Generate IP header and pass packet to ip_output.
 * Tack on options user may have setup with control call.
 */
rip_output(m0, so)
	struct mbuf *m0;
	struct socket *so;
{
	register struct mbuf *m;
	register struct ip *ip;
	int len = 0, error;
	struct rawcb *rp = sotorawcb(so);
	struct sockaddr_in *sin;

#ifdef	pdp11
	MAPSAVE();
#endif	pdp11
	/*
	 * Calculate data length and get an mbuf
	 * for IP header.
	 */
	for (m = m0; m; m = m->m_next)
		len += m->m_len;
	m = m_get(M_DONTWAIT, MT_HEADER);
	if (m == 0) {
		error = ENOBUFS;
		goto bad;
	}
	
	/*
	 * Fill in IP header as needed.
	 */
	m->m_off = MMAXOFF - sizeof(struct ip);
	m->m_len = sizeof(struct ip);
	m->m_next = m0;
	ip = mtod(m, struct ip *);
	ip->ip_tos = 0;
	ip->ip_off = 0;
	ip->ip_p = rp->rcb_proto.sp_protocol;
	ip->ip_len = sizeof(struct ip) + len;
	if (rp->rcb_flags & RAW_LADDR) {
		sin = (struct sockaddr_in *)&rp->rcb_laddr;
		if (sin->sin_family != AF_INET) {
			error = EAFNOSUPPORT;
			goto bad;
		}
		ip->ip_src.s_addr = sin->sin_addr.s_addr;
	} else
		ip->ip_src.s_addr = 0;
	ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
	ip->ip_ttl = MAXTTL;
#ifndef	pdp11
	return (ip_output(m, (struct mbuf *)0, &rp->rcb_route, 
	   IP_ROUTETOIF|IP_ALLOWBROADCAST));
#else	pdp11
	error = ip_output(m, (struct mbuf *)0, &rp->rcb_route, 
	   IP_ROUTETOIF|IP_ALLOWBROADCAST);
	goto out;
#endif	pdp11
bad:
	m_freem(m);
#ifdef	pdp11
out:
	MAPREST();
#endif	pdp11
	return (error);
}