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/* $OpenBSD: if_enc.c,v 1.11 1999/07/05 20:17:05 deraadt 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.
*
* Permission to use, copy, and modify this software 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/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/if_enc.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#ifdef ISO
extern struct ifqueue clnlintrq;
#endif
#ifdef NS
extern struct ifqueue nsintrq;
#endif
#include "bpfilter.h"
struct ifnet encif;
void encattach __P((int));
int encoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *));
int encioctl __P((struct ifnet *, u_long, caddr_t));
void encrtrequest __P((int, struct rtentry *, struct sockaddr *));
void
encattach(int nenc)
{
bzero(&encif, sizeof(encif));
/* We only need one interface anyway under the new mode of operation */
encif.if_index = 0;
encif.if_softc = &encif;
sprintf(encif.if_xname, "enc0");
encif.if_list.tqe_next = NULL;
encif.if_mtu = ENCMTU;
encif.if_flags = 0;
encif.if_type = IFT_ENC;
encif.if_ioctl = encioctl;
encif.if_output = encoutput;
encif.if_hdrlen = ENC_HDRLEN;
encif.if_addrlen = 0;
if_attach(&encif);
#if NBPFILTER > 0
bpfattach(&encif.if_bpf, &encif, DLT_ENC, ENC_HDRLEN);
#endif
}
/*
* Shamelessly stolen from looutput()
*/
int
encoutput(ifp, m, dst, rt)
struct ifnet *ifp;
register struct mbuf *m;
struct sockaddr *dst;
register struct rtentry *rt;
{
register struct ifqueue *ifq = 0;
int s, isr;
if ((m->m_flags & M_PKTHDR) == 0)
panic("encoutput(): no HDR");
ifp->if_lastchange = time;
m->m_pkthdr.rcvif = ifp;
if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
m_freem(m);
return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
}
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef NS
case AF_NS:
ifq = &nsintrq;
isr = NETISR_NS;
break;
#endif
#ifdef ISO
case AF_ISO:
ifq = &clnlintrq;
isr = NETISR_ISO;
break;
#endif
default:
m_freem(m);
return (EAFNOSUPPORT);
}
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
m_freem(m);
splx(s);
return (ENOBUFS);
}
IF_ENQUEUE(ifq, m);
schednetisr(isr);
/* Statistics */
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
splx(s);
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;
{
register struct ifaddr *ifa;
register int error = 0;
switch (cmd) {
case SIOCSIFADDR:
/*
* Everything else is done at a higher level.
*/
ifp->if_flags |= IFF_UP;
ifa = (struct ifaddr *) data;
break;
default:
error = EINVAL;
break;
}
return (error);
}
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