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

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 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: Marvell Extended Distributed Switch Architecture (MEDSA) printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "ether.h"
  32 #include "ethertype.h"
  33 #include "addrtoname.h"
  34 #include "extract.h"
  35
  36 static const char tstr[] = "[|MEDSA]";
  37
  38 /*
  39  * Marvell Extended Distributed Switch Archiecture.
  40  *
  41  * A Marvell propriatary header used for passing packets to/from
  42  * specific ports of a switch. There is no open specification of this
  43  * header, but is documented in the Marvell Switch data sheets. For
  44  * background, see:
  45  *
  46  * https://lwn.net/Articles/302333/
  47  */
  48 struct  medsa_pkthdr {
  49         u_char bytes[6];
  50         u_short ether_type;
  51 };
  52
  53 /* Bytes 0 and 1 are reserved and should contain 0 */
  54 #define TAG(medsa)      (medsa->bytes[2] >> 6)
  55 #define TAG_TO_CPU      0
  56 #define TAG_FROM_CPU    1
  57 #define TAG_FORWARD     3
  58 #define SRC_TAG(medsa)  ((medsa->bytes[2] >> 5) & 0x01)
  59 #define SRC_DEV(medsa)  (medsa->bytes[2] & 0x1f)
  60 #define SRC_PORT(medsa) ((medsa->bytes[3] >> 3) & 0x01f)
  61 #define TRUNK(medsa)    ((medsa->bytes[3] >> 2) & 0x01)
  62 #define CODE(medsa)     ((medsa->bytes[3] & 0x06) |     \
  63                          ((medsa->bytes[4] >> 4) & 0x01))
  64 #define CODE_BDPU       0
  65 #define CODE_IGMP_MLD   2
  66 #define CODE_ARP_MIRROR 4
  67 #define CFI(medsa)      (medsa->bytes[3] & 0x01)
  68 #define PRI(medsa)      (medsa->bytes[4] >> 5)
  69 #define VID(medsa)      (((u_short)(medsa->bytes[4] & 0xf) << 8 |       \
  70                           medsa->bytes[5]))
  71
  72 static const struct tok tag_values[] = {
  73         { TAG_TO_CPU, "To_CPU" },
  74         { TAG_FROM_CPU, "From_CPU" },
  75         { TAG_FORWARD, "Forward" },
  76         { 0, NULL },
  77 };
  78
  79 static const struct tok code_values[] = {
  80         { CODE_BDPU, "BDPU" },
  81         { CODE_IGMP_MLD, "IGMP/MLD" },
  82         { CODE_ARP_MIRROR, "APR_Mirror" },
  83         { 0, NULL },
  84 };
  85
  86 static void
  87 medsa_print_full(netdissect_options *ndo,
  88                  const struct medsa_pkthdr *medsa,
  89                  u_int caplen)
  90 {
  91         u_char tag = TAG(medsa);
  92
  93         ND_PRINT((ndo, "%s",
  94                   tok2str(tag_values, "Unknown (%u)", tag)));
  95
  96         switch (tag) {
  97         case TAG_TO_CPU:
  98                 ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
  99                 ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
 100                           SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
 101
 102                 ND_PRINT((ndo, ", %s",
 103                           tok2str(code_values, "Unknown (%u)", CODE(medsa))));
 104                 if (CFI(medsa))
 105                         ND_PRINT((ndo, ", CFI"));
 106
 107                 ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
 108                 break;
 109         case TAG_FROM_CPU:
 110                 ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
 111                 ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
 112                           SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
 113
 114                 if (CFI(medsa))
 115                         ND_PRINT((ndo, ", CFI"));
 116
 117                 ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
 118                 break;
 119         case TAG_FORWARD:
 120                 ND_PRINT((ndo, ", %stagged", SRC_TAG(medsa) ? "" : "un"));
 121                 if (TRUNK(medsa))
 122                         ND_PRINT((ndo, ", dev.trunk:vlan %d.%d:%d",
 123                                   SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
 124                 else
 125                         ND_PRINT((ndo, ", dev.port:vlan %d.%d:%d",
 126                                   SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
 127
 128                 if (CFI(medsa))
 129                         ND_PRINT((ndo, ", CFI"));
 130
 131                 ND_PRINT((ndo, ", pri %d: ", PRI(medsa)));
 132                 break;
 133         default:
 134                 ND_DEFAULTPRINT((const u_char *)medsa, caplen);
 135                 return;
 136         }
 137 }
 138
 139 void
 140 medsa_print(netdissect_options *ndo,
 141             const u_char *bp, u_int length, u_int caplen)
 142 {
 143         register const struct ether_header *ep;
 144         const struct medsa_pkthdr *medsa;
 145         struct lladdr_info src, dst;
 146         u_short ether_type;
 147
 148         medsa = (const struct medsa_pkthdr *)bp;
 149         ep = (const struct ether_header *)(bp - sizeof(*ep));
 150         ND_TCHECK(*medsa);
 151
 152         if (!ndo->ndo_eflag)
 153                 ND_PRINT((ndo, "MEDSA %d.%d:%d: ",
 154                           SRC_DEV(medsa), SRC_PORT(medsa), VID(medsa)));
 155         else
 156                 medsa_print_full(ndo, medsa, caplen);
 157
 158         bp += 8;
 159         length -= 8;
 160         caplen -= 8;
 161
 162         src.addr = ESRC(ep);
 163         src.addr_string = etheraddr_string;
 164         dst.addr = EDST(ep);
 165         dst.addr_string = etheraddr_string;
 166         ether_type = EXTRACT_16BITS(&medsa->ether_type);
 167         if (ether_type <= ETHERMTU) {
 168                 /* Try to print the LLC-layer header & higher layers */
 169                 if (llc_print(ndo, bp, length, caplen, &src, &dst) < 0) {
 170                         /* packet type not known, print raw packet */
 171                         if (!ndo->ndo_suppress_default_print)
 172                                 ND_DEFAULTPRINT(bp, caplen);
 173                 }
 174         } else {
 175                 if (ndo->ndo_eflag)
 176                         ND_PRINT((ndo, "ethertype %s (0x%04x) ",
 177                                   tok2str(ethertype_values, "Unknown",
 178                                           ether_type),
 179                                   ether_type));
 180
 181                 if (ethertype_print(ndo, ether_type, bp, length, caplen, &src, &dst) == 0) {
 182                         /* ether_type not known, print raw packet */
 183                         if (!ndo->ndo_eflag)
 184                                 ND_PRINT((ndo, "ethertype %s (0x%04x) ",
 185                                           tok2str(ethertype_values, "Unknown",
 186                                                   ether_type),
 187                                           ether_type));
 188
 189                         if (!ndo->ndo_suppress_default_print)
 190                                 ND_DEFAULTPRINT(bp, caplen);
 191                 }
 192         }
 193         return;
 194 trunc:
 195         ND_PRINT((ndo, "%s", tstr));
 196 }
 197
 198 /*
 199  * Local Variables:
 200  * c-style: bsd
 201  * End:
 202  */
 203