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/* $OpenBSD: if_enc.c,v 1.6 1997/11/04 09:10:55 provos Exp $ */
/*
* The author of this code is John Ioannidis, ji@tla.org,
* (except when noted otherwise).
*
* This code was written for BSD/OS in Athens, Greece, in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis, kermit@forthnet.gr.
*
* Additional transforms and features in 1997 by Angelos D. Keromytis and
* Niels Provos.
*
* Copyright (C) 1995, 1996, 1997 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.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NEITHER AUTHOR 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>
#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"
#define ENCMTU (1024+512)
struct ifnet enc_softc;
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)
{
struct ifaddr *ifa;
bzero(&enc_softc, sizeof(struct ifnet));
/* We only need one interface anyway under the new mode of operation */
enc_softc.if_index = 0;
sprintf(enc_softc.if_xname, "enc0");
enc_softc.if_list.tqe_next = NULL;
enc_softc.if_mtu = ENCMTU;
enc_softc.if_flags = IFF_LOOPBACK;
enc_softc.if_type = IFT_ENC;
enc_softc.if_ioctl = encioctl;
enc_softc.if_output = encoutput;
enc_softc.if_hdrlen = 0;
enc_softc.if_addrlen = 0;
if_attach(&enc_softc);
#if NBPFILTER > 0
bpfattach(&(enc_softc.if_bpf), &enc_softc, DLT_NULL, sizeof(u_int32_t));
#endif
/* Just a bogus entry */
ifa = (struct ifaddr *) malloc(sizeof(struct ifaddr) +
sizeof(struct sockaddr), M_IFADDR, M_WAITOK);
bzero(ifa, sizeof(struct ifaddr) + sizeof(struct sockaddr));
ifa->ifa_addr = ifa->ifa_dstaddr = (struct sockaddr *) (ifa + 1);
ifa->ifa_ifp = &enc_softc;
TAILQ_INSERT_HEAD(&(enc_softc.if_addrlist), ifa, ifa_list);
}
/*
* 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;
#if NBPFILTER > 0
if (ifp->if_bpf)
{
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
struct mbuf m0;
u_int af = dst->sa_family;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *) ⁡
bpf_mtap(ifp->if_bpf, &m0);
}
#endif
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;
}
/*
* Process an ioctl request.
* Also shamelessly stolen from loioctl()
*/
/* 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;
}
return error;
}
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