/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)if_eon.c	7.18 (Berkeley) 02/14/92
 */

/***********************************************************
		Copyright IBM Corporation 1987

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of IBM not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

/*
 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
 */
/*
 * $Header: if_eon.c,v 1.4 88/07/19 15:53:59 hagens Exp $ 
 * $Source: /usr/argo/sys/netiso/RCS/if_eon.c,v $ 
 *
 *	EON rfc 
 *  Layer between IP and CLNL
 *
 * TODO:
 * Put together a current rfc986 address format and get the right offset
 * for the nsel
 */

#ifdef EON
#define NEON 1


#include "param.h"
#include "systm.h"
#include "types.h"
#include "mbuf.h"
#include "buf.h"
#include "protosw.h"
#include "socket.h"
#include "ioctl.h"
#include "errno.h"
#include "types.h"

#include "../net/if.h"
#include "../net/if_types.h"
#include "../net/if_dl.h"
#include "../net/netisr.h"
#include "../net/route.h"
#include "machine/mtpr.h"

#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../netinet/in_var.h"
#include "../netinet/ip.h"
#include "../netinet/ip_var.h"
#include "../netinet/if_ether.h"

#include "iso.h"
#include "iso_var.h"
#include "iso_snpac.h"
#include "argo_debug.h"
#include "iso_errno.h"
#include "eonvar.h"
extern struct timeval time;
extern struct ifnet loif;

#define EOK 0

int						eoninput();
int						eonoutput();
int						eonioctl();
int						eonattach();
int						eoninit();
int						eonrtrequest();
extern 	int				ip_output();
struct ifnet			eonif[1];

eonprotoinit() {
	(void) eonattach();
}

struct eon_llinfo eon_llinfo;
#define PROBE_OK 0;


/*
 * FUNCTION:		eonattach
 *
 * PURPOSE:			autoconf attach routine
 *
 * RETURNS:			void
 */

eonattach()
{
	register struct ifnet *ifp = eonif;

	IFDEBUG(D_EON)
		printf("eonattach()\n");
	ENDDEBUG
	ifp->if_unit = 0;
	ifp->if_name = "eon";
	ifp->if_mtu = ETHERMTU; 
		/* since everything will go out over ether or token ring */

	ifp->if_init = eoninit;
	ifp->if_ioctl = eonioctl;
	ifp->if_output = eonoutput;
	ifp->if_type = IFT_EON;
	ifp->if_addrlen = 5;
	ifp->if_hdrlen = EONIPLEN;
	ifp->if_flags = IFF_BROADCAST;
	if_attach(ifp);
	eonioctl(ifp, SIOCSIFADDR, (caddr_t)ifp->if_addrlist);
	eon_llinfo.el_qhdr.link = 
		eon_llinfo.el_qhdr.rlink = &(eon_llinfo.el_qhdr);

	IFDEBUG(D_EON)
		printf("eonattach()\n");
	ENDDEBUG
}


/*
 * FUNCTION:		eonioctl
 *
 * PURPOSE:			io controls - ifconfig
 *				need commands to 
 *					link-UP (core addr) (flags: ES, IS)
 *					link-DOWN (core addr) (flags: ES, IS)
 *				must be callable from kernel or user
 *
 * RETURNS:			nothing
 */
eonioctl(ifp, cmd, data)
	register struct ifnet *ifp;
	int cmd;
	register caddr_t data;
{
	int s = splimp();
	register int error = 0;

	IFDEBUG(D_EON)
		printf("eonioctl (cmd 0x%x) \n", cmd);
	ENDDEBUG

	switch (cmd) {
		register struct ifaddr *ifa;

	case SIOCSIFADDR:
		if (ifa = (struct ifaddr *)data) {
			ifp->if_flags |= IFF_UP;
			if (ifa->ifa_addr->sa_family != AF_LINK)
				ifa->ifa_rtrequest = eonrtrequest;
		}
		break;
	}
	splx(s);
	return(error);
}


eoniphdr(hdr, loc, ro, class, zero)
struct route *ro;
register struct eon_iphdr *hdr;
caddr_t loc;
{
	struct mbuf mhead;
	register struct sockaddr_in *sin = (struct sockaddr_in *)&ro->ro_dst;
	if (zero) {
		bzero((caddr_t)hdr, sizeof (*hdr));
		bzero((caddr_t)ro, sizeof (*ro));
	}
	sin->sin_family = AF_INET;
	sin->sin_len = sizeof (*sin);
	bcopy(loc, (caddr_t)&sin->sin_addr, sizeof(struct in_addr));
	/*
	 * If there is a cached route,
	 * check that it is to the same destination
	 * and is still up.  If not, free it and try again.
	 */
	if (ro->ro_rt) {
		struct sockaddr_in *dst =
			(struct sockaddr_in *)rt_key(ro->ro_rt);
		if ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
		   sin->sin_addr.s_addr != dst->sin_addr.s_addr) {
			RTFREE(ro->ro_rt);
			ro->ro_rt = (struct rtentry *)0;
		}
	}
	rtalloc(ro);
	if (ro->ro_rt)
		ro->ro_rt->rt_use++;
	hdr->ei_ip.ip_dst = sin->sin_addr;
	hdr->ei_ip.ip_p = IPPROTO_EON;
	hdr->ei_ip.ip_ttl = MAXTTL;	
	hdr->ei_eh.eonh_class = class;
	hdr->ei_eh.eonh_vers = EON_VERSION;
	hdr->ei_eh.eonh_csum = 0;
	mhead.m_data = (caddr_t) &hdr->ei_eh;
	mhead.m_len = sizeof(struct eon_hdr);
	mhead.m_next = 0;
	IFDEBUG(D_EON)
		printf("eonoutput : gen csum (0x%x, offset %d, datalen %d)\n", 
			&mhead,
			_offsetof(struct eon_hdr, eonh_csum), sizeof(struct eon_hdr)); 
	ENDDEBUG
	iso_gen_csum(&mhead, 
		_offsetof(struct eon_hdr, eonh_csum), sizeof(struct eon_hdr)); 
}
/*
 * FUNCTION:		eonrtrequest
 *
 * PURPOSE:			maintains list of direct eon recipients.
 *					sets up IP route for rest.
 *
 * RETURNS:			nothing
 */
eonrtrequest(cmd, rt, gate)
register struct rtentry *rt;
register struct sockaddr *gate;
{
	unsigned long zerodst = 0;
	caddr_t	ipaddrloc = (caddr_t) &zerodst;
	register struct eon_llinfo *el = (struct eon_llinfo *)rt->rt_llinfo;

	/*
	 * Common Housekeeping
	 */
	switch (cmd) {
	case RTM_DELETE:
		if (el) {
			remque(&(el->el_qhdr));
			if (el->el_iproute.ro_rt)
				RTFREE(el->el_iproute.ro_rt);
			Free(el);
			rt->rt_llinfo = 0;
		}
		return;

	case RTM_ADD:
	case RTM_RESOLVE:
		rt->rt_rmx.rmx_mtu = loif.if_mtu; /* unless better below */
		R_Malloc(el, struct eon_llinfo *, sizeof(*el));
		rt->rt_llinfo = (caddr_t)el;
		if (el == 0)
			return;
		Bzero(el, sizeof(*el));
		insque(&(el->el_qhdr), &eon_llinfo.el_qhdr);
		el->el_rt = rt;
		break;
	}
	if (gate || (gate = rt->rt_gateway)) switch (gate->sa_family) {
		case AF_LINK:
#define SDL(x) ((struct sockaddr_dl *)x)
			if (SDL(gate)->sdl_alen == 1)
				el->el_snpaoffset = *(u_char *)LLADDR(SDL(gate));
			else
				ipaddrloc = LLADDR(SDL(gate));
			break;
		case AF_INET:
#define SIN(x) ((struct sockaddr_in *)x)
			ipaddrloc = (caddr_t) &SIN(gate)->sin_addr;
			break;
		default:
			return;
	}
	el->el_flags |= RTF_UP;
	eoniphdr(&el->el_ei, ipaddrloc, &el->el_iproute, EON_NORMAL_ADDR, 0);
	if (el->el_iproute.ro_rt)
		rt->rt_rmx.rmx_mtu = el->el_iproute.ro_rt->rt_rmx.rmx_mtu
							- sizeof(el->el_ei);
}

/*
 * FUNCTION:		eoninit
 *
 * PURPOSE:			initialization
 *
 * RETURNS:			nothing
 */

eoninit(unit)
	int unit;
{
	printf("eon driver-init eon%d\n", unit);
}


/*
 * FUNCTION:		eonoutput
 *
 * PURPOSE:			prepend an eon header and hand to IP
 * ARGUMENTS:	 	(ifp) is points to the ifnet structure for this unit/device
 *					(m)  is an mbuf *, *m is a CLNL packet
 *					(dst) is a destination address - have to interp. as
 *					multicast or broadcast or real address.
 *
 * RETURNS:			unix error code
 *
 * NOTES:			
 *
 */
eonoutput(ifp, m, dst, rt)
	struct ifnet 	*ifp;
	register struct mbuf	*m;		/* packet */
	struct sockaddr_iso		*dst;		/* destination addr */
	struct rtentry *rt;
{
	register struct eon_llinfo *el;
	register struct eon_iphdr *ei;
	struct route *ro;
	int	datalen;
	struct mbuf *mh;
	int	error = 0, class = 0, alen = 0;
	caddr_t ipaddrloc;
	static struct eon_iphdr eon_iphdr;
	static struct route route;

	IFDEBUG(D_EON)
		printf("eonoutput \n" );
	ENDDEBUG

	ifp->if_lastchange = time;
	ifp->if_opackets++;
	if (rt == 0 || (el = (struct eon_llinfo *)rt->rt_llinfo) == 0) {
		if (dst->siso_family == AF_LINK) {
			register struct sockaddr_dl *sdl = (struct sockaddr_dl *)dst;

			ipaddrloc = LLADDR(sdl);
			alen = sdl->sdl_alen;
		} else if (dst->siso_family == AF_ISO && dst->siso_data[0] == AFI_SNA) {
			alen = dst->siso_nlen - 1;
			ipaddrloc = (caddr_t) dst->siso_data + 1;
		}
		switch (alen) {
		case 5:
			class =  4[(u_char *)ipaddrloc];
		case 4:
			ro = &route;
			ei = &eon_iphdr;
			eoniphdr(ei, ipaddrloc, ro, class, 1);
			goto send;
		}
einval:
		error =  EINVAL;
		goto flush;
	}
	if ((el->el_flags & RTF_UP) == 0) {
		eonrtrequest(RTM_CHANGE, rt, (struct sockaddr *)0);
		if ((el->el_flags & RTF_UP) == 0) {
			error = EHOSTUNREACH;
			goto flush;
		}
	}
	if ((m->m_flags & M_PKTHDR) == 0) {
		printf("eon: got non headered packet\n");
		goto einval;
	}
	ei = &el->el_ei;
	ro = &el->el_iproute;
	if (el->el_snpaoffset) {
		if (dst->siso_family == AF_ISO) {
			bcopy((caddr_t) &dst->siso_data[el->el_snpaoffset],
					(caddr_t) &ei->ei_ip.ip_dst, sizeof(ei->ei_ip.ip_dst));
		} else
			goto einval;
	}
send:
	/* put an eon_hdr in the buffer, prepended by an ip header */
	datalen = m->m_pkthdr.len + EONIPLEN;
	MGETHDR(mh, M_DONTWAIT, MT_HEADER);
	if(mh == (struct mbuf *)0)
		goto flush;
	mh->m_next = m;
	m = mh;
	MH_ALIGN(m, sizeof(struct eon_iphdr));
	m->m_len = sizeof(struct eon_iphdr);
	ifp->if_obytes +=
		(ei->ei_ip.ip_len = (u_short)(m->m_pkthdr.len = datalen));
	*mtod(m, struct eon_iphdr *) = *ei;

	IFDEBUG(D_EON)
		printf("eonoutput dst ip addr : %x\n",  ei->ei_ip.ip_dst.s_addr);
		printf("eonoutput ip_output : eonip header:\n");
		dump_buf(ei, sizeof(struct eon_iphdr));
	ENDDEBUG

	error = ip_output(m, (struct mbuf *)0, ro, 0);
	m = 0;
	if (error) {
		ifp->if_oerrors++;
		ifp->if_opackets--;
		ifp->if_obytes -= datalen;
	}
flush:
	if (m)
		m_freem(m);
	return error;
}

eoninput(m, iphlen)
	register struct mbuf	*m;
	int iphlen;
{
	register struct eon_hdr	*eonhdr;
	register struct ip		*iphdr;
	struct ifnet 			*eonifp;
	int						s;

	eonifp = &eonif[0]; /* kludge - really want to give CLNP
						* the ifp for eon, not for the real device
						*/

	IFDEBUG(D_EON)
		printf("eoninput() 0x%x m_data 0x%x m_len 0x%x dequeued\n",
			m, m?m->m_data:0, m?m->m_len:0);
	ENDDEBUG

	if (m == 0)
		return;
	if (iphlen > sizeof (struct ip))
		ip_stripoptions(m, (struct mbuf *)0);
	if (m->m_len < EONIPLEN) {
		if ((m = m_pullup(m, EONIPLEN)) == 0) {
			IncStat(es_badhdr);
drop:
			IFDEBUG(D_EON)
				printf("eoninput: DROP \n" );
			ENDDEBUG
			eonifp->if_ierrors ++;
			m_freem(m);
			return;
		}
	}
	eonif->if_ibytes += m->m_pkthdr.len;
	eonif->if_lastchange = time;
	iphdr = mtod(m, struct ip *);
	/* do a few checks for debugging */
	if( iphdr->ip_p != IPPROTO_EON ) {
		IncStat(es_badhdr);
		goto drop;
	}
	/* temporarily drop ip header from the mbuf */
	m->m_data += sizeof(struct ip);
	eonhdr = mtod(m, struct eon_hdr *);
	if( iso_check_csum( m, sizeof(struct eon_hdr) )   != EOK ) {
		IncStat(es_badcsum);
		goto drop;
	}
	m->m_data -= sizeof(struct ip);
		
	IFDEBUG(D_EON)
		printf("eoninput csum ok class 0x%x\n", eonhdr->eonh_class );
		printf("eoninput: eon header:\n");
		dump_buf(eonhdr, sizeof(struct eon_hdr));
	ENDDEBUG

	/* checks for debugging */
	if( eonhdr->eonh_vers != EON_VERSION) {
		IncStat(es_badhdr);
		goto drop;
	}
	m->m_flags &= ~(M_BCAST|M_MCAST);
	switch( eonhdr->eonh_class) {
		case EON_BROADCAST:
			IncStat(es_in_broad);
			m->m_flags |= M_BCAST;
			break;
		case EON_NORMAL_ADDR:
			IncStat(es_in_normal);
			break;
		case EON_MULTICAST_ES:
			IncStat(es_in_multi_es);
			m->m_flags |= M_MCAST;
			break;
		case EON_MULTICAST_IS:
			IncStat(es_in_multi_is);
			m->m_flags |= M_MCAST;
			break;
	}
	eonifp->if_ipackets++;

	{
		/* put it on the CLNP queue and set soft interrupt */
		struct ifqueue 			*ifq;
		extern struct ifqueue 	clnlintrq;

		m->m_pkthdr.rcvif = eonifp; /* KLUDGE */
		IFDEBUG(D_EON)
			printf("eoninput to clnl IFQ\n");
		ENDDEBUG
		ifq = &clnlintrq;
		s = splimp();
		if (IF_QFULL(ifq)) {
			IF_DROP(ifq);
			m_freem(m);
			eonifp->if_iqdrops++;
			eonifp->if_ipackets--;
			splx(s);
			return;
		}
		IF_ENQUEUE(ifq, m);
		IFDEBUG(D_EON) 
			printf(
	"0x%x enqueued on clnp Q: m_len 0x%x m_type 0x%x m_data 0x%x\n", 
				m, m->m_len, m->m_type, m->m_data);
			dump_buf(mtod(m, caddr_t), m->m_len);
		ENDDEBUG
		schednetisr(NETISR_ISO);
		splx(s);
	}
}

int
eonctlinput(cmd, sin)
	int cmd;
	struct sockaddr_in *sin;
{
	extern u_char inetctlerrmap[];

	IFDEBUG(D_EON)
		printf("eonctlinput: cmd 0x%x addr: ", cmd);
		dump_isoaddr(sin);
		printf("\n");
	ENDDEBUG

	if (cmd < 0 || cmd > PRC_NCMDS)
		return 0;

	IncStat(es_icmp[cmd]);
	switch (cmd) {

		case	PRC_QUENCH:
		case	PRC_QUENCH2:
			/* TODO: set the dec bit */
			break;
		case	PRC_TIMXCEED_REASS:
		case	PRC_ROUTEDEAD:
		case	PRC_HOSTUNREACH:
		case	PRC_UNREACH_NET:
		case	PRC_IFDOWN:
		case	PRC_UNREACH_HOST:
		case	PRC_HOSTDEAD:
		case	PRC_TIMXCEED_INTRANS:
			/* TODO: mark the link down */
			break;

		case	PRC_UNREACH_PROTOCOL:
		case	PRC_UNREACH_PORT:
		case	PRC_UNREACH_SRCFAIL:
		case	PRC_REDIRECT_NET:
		case	PRC_REDIRECT_HOST:
		case	PRC_REDIRECT_TOSNET:
		case	PRC_REDIRECT_TOSHOST:
		case	PRC_MSGSIZE:
		case	PRC_PARAMPROB:
			/* printf("eonctlinput: ICMP cmd 0x%x\n", cmd );*/
		break;
	}
	return 0;
}

#endif