The Tcpdump Group git mirrors - tcpdump/blob - print-bcm-li.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 /* \summary: Broadcom LI Printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include "netdissect-stdinc.h"
  29
  30 #define ND_LONGJMP_FROM_TCHECK
  31 #include "netdissect.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"
  34
  35 #define BCM_LI_SHIM_LEN 4
  36
  37 static const struct tok bcm_li_direction_values[] = {
  38     { 1, "unused" },
  39     { 2, "egress" },
  40     { 3, "ingress" },
  41     { 0, NULL}
  42 };
  43
  44 #define BCM_LI_PKT_TYPE_UNDECIDED 4
  45 #define BCM_LI_PKT_TYPE_IPV4      5
  46 #define BCM_LI_PKT_TYPE_IPV6      6
  47 #define BCM_LI_PKT_TYPE_ETHERNET  7
  48
  49 static const struct tok bcm_li_pkt_type_values[] = {
  50     { BCM_LI_PKT_TYPE_UNDECIDED, "undecided" },
  51     { BCM_LI_PKT_TYPE_IPV4, "ipv4" },
  52     { BCM_LI_PKT_TYPE_IPV6, "ipv6" },
  53     { BCM_LI_PKT_TYPE_ETHERNET, "ethernet" },
  54     { 0, NULL}
  55 };
  56
  57 static const struct tok bcm_li_pkt_subtype_values[] = {
  58     { 1, "single VLAN tag" },
  59     { 2, "double VLAN tag" },
  60     { 3, "untagged" },
  61     { 0, NULL}
  62 };
  63
  64 void
  65 bcm_li_print(netdissect_options *ndo,
  66              const u_char *bp, u_int length)
  67 {
  68         u_int shim, direction, pkt_type, pkt_subtype, li_id;
  69
  70         ndo->ndo_protocol = "bcm_li";
  71         if (length < BCM_LI_SHIM_LEN) {
  72             ND_PRINT(" (length %u < %u)", length, BCM_LI_SHIM_LEN);
  73             goto invalid;
  74         }
  75         shim = GET_BE_U_4(bp);
  76
  77         direction = (shim >> 29) & 0x7;
  78         pkt_type = (shim >> 25) & 0xf;
  79         pkt_subtype = (shim >> 22) & 0x7;
  80         li_id = shim & 0x3fffff;
  81
  82         length -= BCM_LI_SHIM_LEN;
  83         bp += BCM_LI_SHIM_LEN;
  84
  85         ND_PRINT("%sBCM-LI-SHIM: direction %s, pkt-type %s, pkt-subtype %s, li-id %u%s",
  86                  ndo->ndo_vflag ? "\n    " : "",
  87                  tok2str(bcm_li_direction_values, "unknown", direction),
  88                  tok2str(bcm_li_pkt_type_values, "unknown", pkt_type),
  89                  tok2str(bcm_li_pkt_subtype_values, "unknown", pkt_subtype),
  90                  li_id,
  91                  ndo->ndo_vflag ? "\n    ": "");
  92
  93         if (!ndo->ndo_vflag) {
  94             ND_TCHECK_LEN(bp, length);
  95             return;
  96         }
  97
  98         switch (pkt_type) {
  99         case BCM_LI_PKT_TYPE_ETHERNET:
 100             ether_print(ndo, bp, length, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
 101             break;
 102         case BCM_LI_PKT_TYPE_IPV4:
 103             ip_print(ndo, bp, length);
 104             break;
 105         case BCM_LI_PKT_TYPE_IPV6:
 106             ip6_print(ndo, bp, length);
 107             break;
 108         case BCM_LI_PKT_TYPE_UNDECIDED:
 109
 110             /*
 111              * Guess IP version from first nibble.
 112              */
 113             if ((GET_U_1(bp) >> 4) == 4) {
 114                 ip_print(ndo, bp, length);
 115             } else if ((GET_U_1(bp) >> 4) == 6) {
 116                 ip6_print(ndo, bp, length);
 117             } else {
 118                 ND_PRINT("unknown payload");
 119             }
 120             break;
 121
 122         default:
 123             goto invalid;
 124         }
 125
 126         return;
 127 invalid:
 128         nd_print_invalid(ndo);
 129 }
 130