usr/src/uts/common/io/bpf/bpf_dlt.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include <sys/types.h>
  28 #include <sys/dlpi.h>
  29 #include <net/if.h>
  30 #include <net/dlt.h>
  31
  32 /*
  33  * This table provides a mapping of the DLPI data link types used in
  34  * Solaris to the BPF data link types. Providing this translation in
  35  * the kernel allows libpcap to be downloaded and used without any
  36  * need for change.
  37  *
  38  * Note that this table is not necessarily sorted.
  39  */
  40 static uint_t dl_to_dlt[][3] = {
  41         { DL_CSMACD,    DLT_EN10MB,     14 },   /* IEEE 802.3 CSMA/CD */
  42         { DL_TPB,       DLT_NULL,       0 },    /* IEEE 802.4 Token Bus */
  43         { DL_TPR,       DLT_IEEE802,    0 },    /* IEEE 802.5 Token Ring */
  44         { DL_METRO,     DLT_NULL,       0 },    /* IEEE 802.6 Metro Net */
  45         { DL_ETHER,     DLT_EN10MB,     14 },   /* Ethernet Bus */
  46         { DL_HDLC,      DLT_C_HDLC,     0 },    /* Cisco HDLC protocol */
  47         { DL_CHAR,      DLT_NULL,       0 },    /* Character Synchr. proto */
  48         { DL_CTCA,      DLT_NULL,       0 },    /* IBM Channel-to-Channel */
  49         { DL_FDDI,      DLT_FDDI,       24 },   /* Fiber Distributed data */
  50         { DL_FC,        DLT_NULL,       0 },    /* Fibre Channel interface */
  51         { DL_ATM,       DLT_SUNATM,     0 },    /* ATM */
  52         { DL_IPATM,     DLT_ATM_CLIP,   0 },    /* ATM CLIP */
  53         { DL_X25,       DLT_NULL,       0 },    /* X.25 LAPB interface */
  54         { DL_ISDN,      DLT_NULL,       0 },    /* ISDN interface */
  55         { DL_HIPPI,     DLT_HIPPI,      0 },    /* HIPPI interface */
  56         { DL_100VG,     DLT_EN10MB,     14 },   /* 100 Based VG Ethernet */
  57         { DL_100VGTPR,  DLT_IEEE802,    0 },    /* 100 Based VG Token Ring */
  58         { DL_ETH_CSMA,  DLT_EN10MB,     14 },   /* ISO 8802/3 and Ethernet */
  59         { DL_100BT,     DLT_EN10MB,     14 },   /* 100 Base T */
  60         { DL_IB,        DLT_IPOIB,      44 },   /* Solaris IPoIB (infini.) */
  61         { DL_FRAME,     DLT_FRELAY,     0 },    /* Frame Relay LAPF */
  62         { DL_MPFRAME,   DLT_NULL,       0 },    /* Multi-protocol Frame Relay */
  63         { DL_ASYNC,     DLT_NULL,       0 },    /* Character Asynch. Protocol */
  64         { DL_IPX25,     DLT_NULL,       0 },    /* X.25 Classical IP */
  65         { DL_LOOP,      DLT_NULL,       0 },    /* software loopback */
  66         { DL_IPV4,      DLT_RAW,        0 },    /* IPv4 Tunnel Link */
  67         { DL_IPV6,      DLT_RAW,        0 },    /* IPv6 Tunnel Link */
  68         { SUNW_DL_VNI,  DLT_NULL,       0 },    /* Virtual network interface */
  69         { DL_WIFI,      DLT_IEEE802_11, 0 },    /* IEEE 802.11 */
  70         { DL_IPNET,     DLT_IPNET,      24 },   /* Solaris IP Observability */
  71         { DL_OTHER,     DLT_NULL,       0 },    /* Mediums not listed above */
  72         { 0,            0 }
  73 };
  74
  75 /*
  76  * Given a data link type number used with DLPI on Solaris, return
  77  * the equivalent data link type number for use with BPF.
  78  */
  79 int
  80 bpf_dl_to_dlt(int dl)
  81 {
  82         int i;
  83
  84         for (i = 0; i < sizeof (dl_to_dlt) / sizeof (dl_to_dlt[0]); i++)
  85                 if (dl_to_dlt[i][0] == dl)
  86                         return (dl_to_dlt[i][1]);
  87         return (0);
  88 }
  89
  90 /*
  91  * Given a DLPI data link type for Solaris, return the expected header
  92  * size of the link layer.
  93  */
  94 int
  95 bpf_dl_hdrsize(int dl)
  96 {
  97         int i;
  98
  99         for (i = 0; i < sizeof (dl_to_dlt) / sizeof (dl_to_dlt[0]); i++)
 100                 if (dl_to_dlt[i][0] == dl)
 101                         return (dl_to_dlt[i][2]);
 102         return (0);
 103 }