ip_output.c revision 677833bc953b6cb418c701facbdcf4aa18d6c44e
/*
* Copyright (c) 1982, 1986, 1988, 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
* 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.
*
* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
* ip_output.c,v 1.9 1994/11/16 10:17:10 jkh Exp
*/
/*
* Changes and additions relating to SLiRP are
* Copyright (c) 1995 Danny Gasparovski.
*
* Please read the file COPYRIGHT for the
* terms and conditions of the copyright.
*/
#include <slirp.h>
/*
* IP output. The packet in mbuf chain m contains a skeletal IP
* header (with len, off, ttl, proto, tos, src, dst).
* The mbuf chain containing the packet will be freed.
* The mbuf opt, if present, will not be freed.
*/
int
{
DEBUG_CALL("ip_output");
/* We do no options */
/* if (opt) {
* m = ip_insertoptions(m, opt, &len);
* hlen = len;
* }
*/
/*
* Fill in IP header.
*/
/*
* Verify that we have any chance at all of being able to queue
* the packet or packet fragments
*/
/* XXX Hmmm... */
/* if (if_queued > if_thresh && towrite <= 0) {
* error = ENOBUFS;
* goto bad;
* }
*/
/*
* If small enough for interface, can just send directly.
*/
goto done;
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
error = -1;
goto bad;
}
if (len < 8) {
error = -1;
goto bad;
}
{
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto chain.
*/
m0 = m;
m = m_get();
if (m == 0) {
error = -1;
goto sendorfree;
}
m->m_data += if_maxlinkhdr;
/* No options */
/* if (hlen > sizeof (struct ip)) {
* mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
* mhip->ip_hl = mhlen >> 2;
* }
*/
else
error = -1;
goto sendorfree;
}
*mnext = m;
}
/*
* Update first fragment by trimming what's been copied out
* and updating header, then send each fragment (in order).
*/
m = m0;
m->m_nextpkt = 0;
if (error == 0)
else
m_freem(m);
}
if (error == 0)
}
done:
return (error);
bad:
goto done;
}