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 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #define ND_LONGJMP_FROM_TCHECK
  29 #include "netdissect.h"
  30 #include "addrtoname.h"
  31 #include "extract.h"
  32
  33 #define BCM_LI_SHIM_LEN 4
  34
  35 static const struct tok bcm_li_direction_values[] = {
  36     { 1, "unused" },
  37     { 2, "egress" },
  38     { 3, "ingress" },
  39     { 0, NULL}
  40 };
  41
  42 #define BCM_LI_PKT_TYPE_UNDECIDED 4
  43 #define BCM_LI_PKT_TYPE_IPV4      5
  44 #define BCM_LI_PKT_TYPE_IPV6      6
  45 #define BCM_LI_PKT_TYPE_ETHERNET  7
  46
  47 static const struct tok bcm_li_pkt_type_values[] = {
  48     { BCM_LI_PKT_TYPE_UNDECIDED, "undecided" },
  49     { BCM_LI_PKT_TYPE_IPV4, "ipv4" },
  50     { BCM_LI_PKT_TYPE_IPV6, "ipv6" },
  51     { BCM_LI_PKT_TYPE_ETHERNET, "ethernet" },
  52     { 0, NULL}
  53 };
  54
  55 static const struct tok bcm_li_pkt_subtype_values[] = {
  56     { 1, "single VLAN tag" },
  57     { 2, "double VLAN tag" },
  58     { 3, "untagged" },
  59     { 0, NULL}
  60 };
  61
  62 void
  63 bcm_li_print(netdissect_options *ndo,
  64              const u_char *bp, u_int length)
  65 {
  66         u_int shim, direction, pkt_type, pkt_subtype, li_id;
  67
  68         ndo->ndo_protocol = "bcm_li";
  69         if (length < BCM_LI_SHIM_LEN) {
  70             ND_PRINT(" (length %u < %u)", length, BCM_LI_SHIM_LEN);
  71             goto invalid;
  72         }
  73         shim = GET_BE_U_4(bp);
  74
  75         direction = (shim >> 29) & 0x7;
  76         pkt_type = (shim >> 25) & 0xf;
  77         pkt_subtype = (shim >> 22) & 0x7;
  78         li_id = shim & 0x3fffff;
  79
  80         length -= BCM_LI_SHIM_LEN;
  81         bp += BCM_LI_SHIM_LEN;
  82
  83         ND_PRINT("%sBCM-LI-SHIM: direction %s, pkt-type %s, pkt-subtype %s, li-id %u%s",
  84                  ndo->ndo_vflag ? "\n    " : "",
  85                  tok2str(bcm_li_direction_values, "unknown", direction),
  86                  tok2str(bcm_li_pkt_type_values, "unknown", pkt_type),
  87                  tok2str(bcm_li_pkt_subtype_values, "unknown", pkt_subtype),
  88                  li_id,
  89                  ndo->ndo_vflag ? "\n    ": "");
  90
  91         if (!ndo->ndo_vflag) {
  92             ND_TCHECK_LEN(bp, length);
  93             return;
  94         }
  95
  96         switch (pkt_type) {
  97         case BCM_LI_PKT_TYPE_ETHERNET:
  98             ether_print(ndo, bp, length, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
  99             break;
 100         case BCM_LI_PKT_TYPE_IPV4:
 101             ip_print(ndo, bp, length);
 102             break;
 103         case BCM_LI_PKT_TYPE_IPV6:
 104             ip6_print(ndo, bp, length);
 105             break;
 106         case BCM_LI_PKT_TYPE_UNDECIDED:
 107
 108             /*
 109              * Guess IP version from first nibble.
 110              */
 111             if ((GET_U_1(bp) >> 4) == 4) {
 112                 ip_print(ndo, bp, length);
 113             } else if ((GET_U_1(bp) >> 4) == 6) {
 114                 ip6_print(ndo, bp, length);
 115             } else {
 116                 ND_PRINT("unknown payload");
 117             }
 118             break;
 119
 120         default:
 121             goto invalid;
 122         }
 123
 124         return;
 125 invalid:
 126         nd_print_invalid(ndo);
 127 }
 128