/*-
 * Copyright (c) 1995, 1996 Matt Thomas <matt@3am-software.com>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * $Id: pdq_ifsubr.c,v 1.4 1997/03/24 11:32:26 bde Exp $
 *
 */

/*
 * DEC PDQ FDDI Controller; code for BSD derived operating systems
 *
 *	This module provide bus independent BSD specific O/S functions.
 *	(ie. it provides an ifnet interface to the rest of the system)
 */


#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#if defined(__bsdi__) || defined(__NetBSD__)
#include <sys/device.h>
#endif

#include <net/if.h>
#include <net/if_dl.h>

#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif
#if defined(__FreeBSD__)
#include <netinet/if_fddi.h>
#else
#include <net/if_fddi.h>
#endif

#if defined(__bsdi__)
#include <i386/isa/isavar.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#if defined(__FreeBSD__)
#include <dev/pdq/pdqvar.h>
#include <dev/pdq/pdqreg.h>
#else
#include "pdqvar.h"
#include "pdqreg.h"
#endif

#if defined(__bsdi__) && _BSDI_VERSION < 199506 /* XXX */
static void
arp_ifinit(
    struct arpcom *ac,
    struct ifaddr *ifa)
{
    sc->sc_ac.ac_ipaddr = IA_SIN(ifa)->sin_addr;
    arpwhohas(&sc->sc_ac, &IA_SIN(ifa)->sin_addr);
#if _BSDI_VERSION >= 199401
    ifa->ifa_rtrequest = arp_rtrequest;
    ifa->ifa_flags |= RTF_CLONING;
#endif
#endif


void
pdq_ifinit(
    pdq_softc_t *sc)
{
    if (sc->sc_if.if_flags & IFF_UP) {
	sc->sc_if.if_flags |= IFF_RUNNING;
	if (sc->sc_if.if_flags & IFF_PROMISC) {
	    sc->sc_pdq->pdq_flags |= PDQ_PROMISC;
	} else {
	    sc->sc_pdq->pdq_flags &= ~PDQ_PROMISC;
	}
	if (sc->sc_if.if_flags & IFF_ALLMULTI) {
	    sc->sc_pdq->pdq_flags |= PDQ_ALLMULTI;
	} else {
	    sc->sc_pdq->pdq_flags &= ~PDQ_ALLMULTI;
	}
	if (sc->sc_if.if_flags & IFF_LINK1) {
	    sc->sc_pdq->pdq_flags |= PDQ_PASS_SMT;
	} else {
	    sc->sc_pdq->pdq_flags &= ~PDQ_PASS_SMT;
	}
	sc->sc_pdq->pdq_flags |= PDQ_RUNNING;
	pdq_run(sc->sc_pdq);
    } else {
	sc->sc_if.if_flags &= ~IFF_RUNNING;
	sc->sc_pdq->pdq_flags &= ~PDQ_RUNNING;
	pdq_stop(sc->sc_pdq);
    }
}

void
pdq_ifwatchdog(
    struct ifnet *ifp)
{
    /*
     * No progress was made on the transmit queue for PDQ_OS_TX_TRANSMIT
     * seconds.  Remove all queued packets.
     */

    ifp->if_flags &= ~IFF_OACTIVE;
    ifp->if_timer = 0;
    for (;;) {
	struct mbuf *m;
	IF_DEQUEUE(&ifp->if_snd, m);
	if (m == NULL)
	    return;
	m_freem(m);
    }
}

ifnet_ret_t
pdq_ifstart(
    struct ifnet *ifp)
{
    pdq_softc_t *sc = (pdq_softc_t *) ((caddr_t) ifp - offsetof(pdq_softc_t, sc_ac.ac_if));
    struct ifqueue *ifq = &ifp->if_snd;
    struct mbuf *m;
    int tx = 0;

    if ((ifp->if_flags & IFF_RUNNING) == 0)
	return;

    if (sc->sc_if.if_timer == 0)
	sc->sc_if.if_timer = PDQ_OS_TX_TIMEOUT;

    if ((sc->sc_pdq->pdq_flags & PDQ_TXOK) == 0) {
	sc->sc_if.if_flags |= IFF_OACTIVE;
	return;
    }
    for (;; tx = 1) {
	IF_DEQUEUE(ifq, m);
	if (m == NULL)
	    break;

	if (pdq_queue_transmit_data(sc->sc_pdq, m) == PDQ_FALSE) {
	    ifp->if_flags |= IFF_OACTIVE;
	    IF_PREPEND(ifq, m);
	    break;
	}
    }
    if (tx)
	PDQ_DO_TYPE2_PRODUCER(sc->sc_pdq);
}

void
pdq_os_receive_pdu(
    pdq_t *pdq,
    struct mbuf *m,
    size_t pktlen)
{
    pdq_softc_t *sc = (pdq_softc_t *) pdq->pdq_os_ctx;
    struct fddi_header *fh = mtod(m, struct fddi_header *);

    sc->sc_if.if_ipackets++;
#if NBPFILTER > 0
    if (sc->sc_bpf != NULL)
	PDQ_BPF_MTAP(sc, m);
    if ((fh->fddi_fc & (FDDIFC_L|FDDIFC_F)) != FDDIFC_LLC_ASYNC) {
	m_freem(m);
	return;
    }
#endif

    m->m_data += sizeof(struct fddi_header);
    m->m_len  -= sizeof(struct fddi_header);
    m->m_pkthdr.len = pktlen - sizeof(struct fddi_header);
    m->m_pkthdr.rcvif = &sc->sc_if;
    fddi_input(&sc->sc_if, fh, m);
}

void
pdq_os_restart_transmitter(
    pdq_t *pdq)
{
    pdq_softc_t *sc = (pdq_softc_t *) pdq->pdq_os_ctx;
    sc->sc_if.if_flags &= ~IFF_OACTIVE;
    if (sc->sc_if.if_snd.ifq_head != NULL) {
	sc->sc_if.if_timer = PDQ_OS_TX_TIMEOUT;
	pdq_ifstart(&sc->sc_if);
    } else {
	sc->sc_if.if_timer = 0;
    }
}

void
pdq_os_transmit_done(
    pdq_t *pdq,
    struct mbuf *m)
{
    pdq_softc_t *sc = (pdq_softc_t *) pdq->pdq_os_ctx;
#if NBPFILTER > 0
    if (sc->sc_bpf != NULL)
	PDQ_BPF_MTAP(sc, m);
#endif
    m_freem(m);
    sc->sc_if.if_opackets++;
}

void
pdq_os_addr_fill(
    pdq_t *pdq,
    pdq_lanaddr_t *addr,
    size_t num_addrs)
{
    pdq_softc_t *sc = (pdq_softc_t *) pdq->pdq_os_ctx;
    struct ifmultiaddr *ifma;

    for (ifma = sc->sc_if.if_multiaddrs.lh_first; ifma && num_addrs > 0;
	 ifma = ifma->ifma_link.le_next) {
	    char *mcaddr;
	    if (ifma->ifma_addr->sa_family != AF_LINK)
		    continue;
	    mcaddr = LLADDR((struct sockaddr_dl *)ifma->ifma_addr);
	    ((u_short *) addr->lanaddr_bytes)[0] = ((u_short *) mcaddr)[0];
	    ((u_short *) addr->lanaddr_bytes)[1] = ((u_short *) mcaddr)[1];
	    ((u_short *) addr->lanaddr_bytes)[2] = ((u_short *) mcaddr)[2];
	    addr++;
	    num_addrs--;
    }
}

int
pdq_ifioctl(
    struct ifnet *ifp,
    ioctl_cmd_t cmd,
    caddr_t data)
{
    pdq_softc_t *sc = (pdq_softc_t *) ((caddr_t) ifp - offsetof(pdq_softc_t, sc_ac.ac_if));
    int s, error = 0;

    s = splimp();

    switch (cmd) {
	case SIOCSIFADDR: {
	    struct ifaddr *ifa = (struct ifaddr *)data;

	    ifp->if_flags |= IFF_UP;
	    switch(ifa->ifa_addr->sa_family) {
#if defined(INET)
		case AF_INET: {
		    pdq_ifinit(sc);
		    arp_ifinit(&sc->sc_ac, ifa);
		    break;
		}
#endif /* INET */

#if defined(NS)
		/* This magic copied from if_is.c; I don't use XNS,
		 * so I have no way of telling if this actually
		 * works or not.
		 */
		case AF_NS: {
		    struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
		    if (ns_nullhost(*ina)) {
			ina->x_host = *(union ns_host *)(sc->sc_ac.ac_enaddr);
		    } else {
			ifp->if_flags &= ~IFF_RUNNING;
			bcopy((caddr_t)ina->x_host.c_host,
			      (caddr_t)sc->sc_ac.ac_enaddr,
			      sizeof sc->sc_ac.ac_enaddr);
		    }

		    pdq_ifinit(sc);
		    break;
		}
#endif /* NS */

		default: {
		    pdq_ifinit(sc);
		    break;
		}
	    }
	    break;
	}
	case SIOCGIFADDR: {
	    struct ifreq *ifr = (struct ifreq *)data;
	    bcopy((caddr_t) sc->sc_ac.ac_enaddr,
		  (caddr_t) ((struct sockaddr *)&ifr->ifr_data)->sa_data,
		  6);
	    break;
	}

	case SIOCSIFFLAGS: {
	    pdq_ifinit(sc);
	    break;
	}

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		/*
		 * Update multicast listeners
		 */
		if (sc->sc_if.if_flags & IFF_RUNNING)
			pdq_run(sc->sc_pdq);
		error = 0;
		break;

#if defined(SIOCSIFMTU)
#if !defined(ifr_mtu)
#define ifr_mtu ifr_metric
#endif
	case SIOCSIFMTU: {
	    struct ifreq *ifr = (struct ifreq *)data;
	    /*
	     * Set the interface MTU.
	     */
	    if (ifr->ifr_mtu > FDDIMTU) {
		error = EINVAL;
		break;
	    }
	    ifp->if_mtu = ifr->ifr_mtu;
	    break;
	}
#endif /* SIOCSIFMTU */

	default: {
	    error = EINVAL;
	    break;
	}
    }

    splx(s);
    return error;
}

#ifndef IFF_NOTRAILERS
#define	IFF_NOTRAILERS	0
#endif

void
pdq_ifattach(
    pdq_softc_t *sc,
    ifnet_ret_t (*ifwatchdog)(int unit))
{
    struct ifnet *ifp = &sc->sc_if;

    ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_NOTRAILERS|IFF_MULTICAST;

#if (defined(__FreeBSD__) && BSD >= 199506) || defined(__NetBSD__)
    ifp->if_watchdog = pdq_ifwatchdog;
#else
    ifp->if_watchdog = ifwatchdog;
#endif

    ifp->if_ioctl = pdq_ifioctl;
    ifp->if_output = fddi_output;
    ifp->if_start = pdq_ifstart;
#warning "Implement fddi_resolvemulti!"
/*    ifp->if_resolvemulti = ether_resolvemulti; XXX */
  
    if_attach(ifp);
    fddi_ifattach(ifp);
#if NBPFILTER > 0
    PDQ_BPFATTACH(sc, DLT_FDDI, sizeof(struct fddi_header));
#endif
}