/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/dlpi.h>
#include <net/if.h>
#include <net/dlt.h>

/*
 * This table provides a mapping of the DLPI data link types used in
 * Solaris to the BPF data link types. Providing this translation in
 * the kernel allows libpcap to be downloaded and used without any
 * need for change.
 *
 * Note that this table is not necessarily sorted.
 */
static uint_t dl_to_dlt[][3] = {
        { DL_CSMACD,    DLT_EN10MB,     14 },   /* IEEE 802.3 CSMA/CD */
        { DL_TPB,       DLT_NULL,       0 },    /* IEEE 802.4 Token Bus */
        { DL_TPR,       DLT_IEEE802,    0 },    /* IEEE 802.5 Token Ring */
        { DL_METRO,     DLT_NULL,       0 },    /* IEEE 802.6 Metro Net */
        { DL_ETHER,     DLT_EN10MB,     14 },   /* Ethernet Bus */
        { DL_HDLC,      DLT_C_HDLC,     0 },    /* Cisco HDLC protocol */
        { DL_CHAR,      DLT_NULL,       0 },    /* Character Synchr. proto */
        { DL_CTCA,      DLT_NULL,       0 },    /* IBM Channel-to-Channel */
        { DL_FDDI,      DLT_FDDI,       24 },   /* Fiber Distributed data */
        { DL_FC,        DLT_NULL,       0 },    /* Fibre Channel interface */
        { DL_ATM,       DLT_SUNATM,     0 },    /* ATM */
        { DL_IPATM,     DLT_ATM_CLIP,   0 },    /* ATM CLIP */
        { DL_X25,       DLT_NULL,       0 },    /* X.25 LAPB interface */
        { DL_ISDN,      DLT_NULL,       0 },    /* ISDN interface */
        { DL_HIPPI,     DLT_HIPPI,      0 },    /* HIPPI interface */
        { DL_100VG,     DLT_EN10MB,     14 },   /* 100 Based VG Ethernet */
        { DL_100VGTPR,  DLT_IEEE802,    0 },    /* 100 Based VG Token Ring */
        { DL_ETH_CSMA,  DLT_EN10MB,     14 },   /* ISO 8802/3 and Ethernet */
        { DL_100BT,     DLT_EN10MB,     14 },   /* 100 Base T */
        { DL_IB,        DLT_IPOIB,      44 },   /* Solaris IPoIB (infini.) */
        { DL_FRAME,     DLT_FRELAY,     0 },    /* Frame Relay LAPF */
        { DL_MPFRAME,   DLT_NULL,       0 },    /* Multi-protocol Frame Relay */
        { DL_ASYNC,     DLT_NULL,       0 },    /* Character Asynch. Protocol */
        { DL_IPX25,     DLT_NULL,       0 },    /* X.25 Classical IP */
        { DL_LOOP,      DLT_NULL,       0 },    /* software loopback */
        { DL_IPV4,      DLT_RAW,        0 },    /* IPv4 Tunnel Link */
        { DL_IPV6,      DLT_RAW,        0 },    /* IPv6 Tunnel Link */
        { SUNW_DL_VNI,  DLT_NULL,       0 },    /* Virtual network interface */
        { DL_WIFI,      DLT_IEEE802_11, 0 },    /* IEEE 802.11 */
        { DL_IPNET,     DLT_IPNET,      24 },   /* Solaris IP Observability */
        { DL_OTHER,     DLT_NULL,       0 },    /* Mediums not listed above */
        { 0,            0 }
};

/*
 * Given a data link type number used with DLPI on Solaris, return
 * the equivalent data link type number for use with BPF.
 */
int
bpf_dl_to_dlt(int dl)
{
        int i;

        for (i = 0; i < sizeof (dl_to_dlt) / sizeof (dl_to_dlt[0]); i++)
                if (dl_to_dlt[i][0] == dl)
                        return (dl_to_dlt[i][1]);
        return (0);
}

/*
 * Given a DLPI data link type for Solaris, return the expected header
 * size of the link layer.
 */
int
bpf_dl_hdrsize(int dl)
{
        int i;

        for (i = 0; i < sizeof (dl_to_dlt) / sizeof (dl_to_dlt[0]); i++)
                if (dl_to_dlt[i][0] == dl)
                        return (dl_to_dlt[i][2]);
        return (0);
}