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/* $OpenBSD: if_enc.c,v 1.43 2006/03/04 22:40:15 brad Exp $ */
/*
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
* Niels Provos (provos@physnet.uni-hamburg.de).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
* and Niels Provos.
* Copyright (c) 2001, Angelos D. Keromytis.
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
/*
* Encapsulation interface driver.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/if_enc.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/nd6.h>
#endif /* INET6 */
#include "bpfilter.h"
#include "enc.h"
#ifdef ENCDEBUG
#define DPRINTF(x) do { if (encdebug) printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
struct enc_softc encif[NENC];
void encattach(int);
int encoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int encioctl(struct ifnet *, u_long, caddr_t);
void encrtrequest(int, struct rtentry *, struct sockaddr *);
void encstart(struct ifnet *);
extern int ifqmaxlen;
void
encattach(int nenc)
{
struct ifnet *ifp;
int i;
bzero(encif, sizeof(encif));
for (i = 0; i < NENC; i++)
{
ifp = &encif[i].sc_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i);
ifp->if_softc = &encif[i];
ifp->if_mtu = ENCMTU;
ifp->if_ioctl = encioctl;
ifp->if_output = encoutput;
ifp->if_start = encstart;
ifp->if_type = IFT_ENC;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_hdrlen = ENC_HDRLEN;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
#endif
}
}
/*
* Start output on the enc interface.
*/
void
encstart(ifp)
struct ifnet *ifp;
{
struct mbuf *m;
int s;
for (;;)
{
s = splnet();
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
else
m_freem(m);
}
}
int
encoutput(ifp, m, dst, rt)
struct ifnet *ifp;
register struct mbuf *m;
struct sockaddr *dst;
register struct rtentry *rt;
{
m_freem(m);
return (0);
}
/* ARGSUSED */
void
encrtrequest(cmd, rt, sa)
int cmd;
struct rtentry *rt;
struct sockaddr *sa;
{
if (rt)
rt->rt_rmx.rmx_mtu = ENCMTU;
}
/* ARGSUSED */
int
encioctl(ifp, cmd, data)
register struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
switch (cmd)
{
case SIOCSIFADDR:
case SIOCAIFADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
default:
return (EINVAL);
}
return 0;
}
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