The Tcpdump Group git mirrors - tcpdump/blob - print-dsa.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 (Ethertype) Distributed Switch Architecture printer */
  23
  24 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #include "netdissect.h"
  29 #include "ethertype.h"
  30 #include "addrtoname.h"
  31 #include "extract.h"
  32
  33 /*
  34  * Format of (Ethertyped or not) DSA tagged frames:
  35  *
  36  *      7   6   5   4   3   2   1   0
  37  *    .   .   .   .   .   .   .   .   .
  38  *  0 +---+---+---+---+---+---+---+---+
  39  *    |   Ether Destination Address   |
  40  * +6 +---+---+---+---+---+---+---+---+
  41  *    |     Ether Source Address      |
  42  * +6 +---+---+---+---+---+---+---+---+  +-
  43  *    |  Prog. DSA Ether Type [15:8]  |  | (8-byte) EDSA Tag
  44  * +1 +---+---+---+---+---+---+---+---+  | Contains a programmable Ether type,
  45  *    |  Prog. DSA Ether Type [7:0]   |  | two reserved bytes (always 0),
  46  * +1 +---+---+---+---+---+---+---+---+  | and a standard DSA tag.
  47  *    |     Reserved (0x00 0x00)      |  |
  48  * +2 +---+---+---+---+---+---+---+---+  |  +-
  49  *    | Mode  |b29|    Src/Trg Dev    |  |  | (4-byte) DSA Tag
  50  * +1 +---+---+---+---+---+---+---+---+  |  | Contains a DSA tag mode,
  51  *    |Src/Trg Port/Trunk |b18|b17|b16|  |  | source or target switch device,
  52  * +1 +---+---+---+---+---+---+---+---+  |  | source or target port or trunk,
  53  *    | PRI [2:0] |b12|  VID [11:8]   |  |  | and misc (IEEE and FPri) bits.
  54  * +1 +---+---+---+---+---+---+---+---+  |  |
  55  *    |           VID [7:0]           |  |  |
  56  * +1 +---+---+---+---+---+---+---+---+  +- +-
  57  *    |       Ether Length/Type       |
  58  * +2 +---+---+---+---+---+---+---+---+
  59  *    .   .   .   .   .   .   .   .   .
  60  *
  61  * Mode: Forward, To_CPU, From_CPU, To_Sniffer
  62  * b29: (Source or Target) IEEE Tag Mode
  63  * b18: Forward's Src_Is_Trunk, To_CPU's Code[2], To_Sniffer's Rx_Sniff
  64  * b17: To_CPU's Code[1]
  65  * b16: Original frame's CFI
  66  * b12: To_CPU's Code[0]
  67  */
  68
  69 #define TOK(tag, byte, mask, shift) ((GET_U_1(&(((const u_char *) tag)[byte])) & (mask)) >> (shift))
  70
  71 #define DSA_LEN 4
  72 #define DSA_MODE(tag) TOK(tag, 0, 0xc0, 6)
  73 #define  DSA_MODE_TO_CPU 0x0
  74 #define  DSA_MODE_FROM_CPU 0x1
  75 #define  DSA_MODE_TO_SNIFFER 0x2
  76 #define  DSA_MODE_FORWARD 0x3
  77 #define DSA_TAGGED(tag) TOK(tag, 0, 0x20, 5)
  78 #define DSA_DEV(tag) TOK(tag, 0, 0x1f, 0)
  79 #define DSA_PORT(tag) TOK(tag, 1, 0xf8, 3)
  80 #define DSA_TRUNK(tag) TOK(tag, 1, 0x04, 2)
  81 #define DSA_RX_SNIFF(tag) TOK(tag, 1, 0x04, 2)
  82 #define DSA_CFI(tag) TOK(tag, 1, 0x01, 0)
  83 #define DSA_PRI(tag) TOK(tag, 2, 0xe0, 5)
  84 #define DSA_VID(tag) ((u_short)((TOK(tag, 2, 0x0f, 0) << 8) | (TOK(tag, 3, 0xff, 0))))
  85 #define DSA_CODE(tag) ((TOK(tag, 1, 0x06, 1) << 1) | TOK(tag, 2, 0x10, 4))
  86
  87 #define EDSA_LEN 8
  88
  89 static const struct tok dsa_mode_values[] = {
  90         { DSA_MODE_TO_CPU, "To CPU" },
  91         { DSA_MODE_FROM_CPU, "From CPU" },
  92         { DSA_MODE_TO_SNIFFER, "To Sniffer"},
  93         { DSA_MODE_FORWARD, "Forward" },
  94         { 0, NULL }
  95 };
  96
  97 static const struct tok dsa_code_values[] = {
  98         { 0x0, "BPDU (MGMT) Trap" },
  99         { 0x1, "Frame2Reg" },
 100         { 0x2, "IGMP/MLD Trap" },
 101         { 0x3, "Policy Trap" },
 102         { 0x4, "ARP Mirror" },
 103         { 0x5, "Policy Mirror" },
 104         { 0, NULL }
 105 };
 106
 107 static void
 108 tag_common_print(netdissect_options *ndo, const u_char *p)
 109 {
 110         if (ndo->ndo_eflag) {
 111                 ND_PRINT("mode %s, ", tok2str(dsa_mode_values, "unknown", DSA_MODE(p)));
 112
 113                 switch (DSA_MODE(p)) {
 114                 case DSA_MODE_FORWARD:
 115                         ND_PRINT("dev %u, %s %u, ", DSA_DEV(p),
 116                                  DSA_TRUNK(p) ? "trunk" : "port", DSA_PORT(p));
 117                         break;
 118                 case DSA_MODE_FROM_CPU:
 119                         ND_PRINT("target dev %u, port %u, ",
 120                                  DSA_DEV(p), DSA_PORT(p));
 121                         break;
 122                 case DSA_MODE_TO_CPU:
 123                         ND_PRINT("source dev %u, port %u, ",
 124                                  DSA_DEV(p), DSA_PORT(p));
 125                         ND_PRINT("code %s, ",
 126                                  tok2str(dsa_code_values, "reserved", DSA_CODE(p)));
 127                         break;
 128                 case DSA_MODE_TO_SNIFFER:
 129                         ND_PRINT("source dev %u, port %u, ",
 130                                  DSA_DEV(p), DSA_PORT(p));
 131                         ND_PRINT("%s sniff, ",
 132                                  DSA_RX_SNIFF(p) ? "ingress" : "egress");
 133                         break;
 134                 default:
 135                         break;
 136                 }
 137
 138                 ND_PRINT("%s, ", DSA_TAGGED(p) ? "tagged" : "untagged");
 139                 ND_PRINT("%s", DSA_CFI(p) ? "CFI, " : "");
 140                 ND_PRINT("VID %u, ", DSA_VID(p));
 141                 ND_PRINT("FPri %u, ", DSA_PRI(p));
 142         } else {
 143                 switch (DSA_MODE(p)) {
 144                 case DSA_MODE_FORWARD:
 145                         ND_PRINT("Forward %s %u.%u, ",
 146                                  DSA_TRUNK(p) ? "trunk" : "port",
 147                                  DSA_DEV(p), DSA_PORT(p));
 148                         break;
 149                 case DSA_MODE_FROM_CPU:
 150                         ND_PRINT("CPU > port %u.%u, ",
 151                                  DSA_DEV(p), DSA_PORT(p));
 152                         break;
 153                 case DSA_MODE_TO_CPU:
 154                         ND_PRINT("port %u.%u > CPU, ",
 155                                  DSA_DEV(p), DSA_PORT(p));
 156                         break;
 157                 case DSA_MODE_TO_SNIFFER:
 158                         ND_PRINT("port %u.%u > %s Sniffer, ",
 159                                  DSA_DEV(p), DSA_PORT(p),
 160                                  DSA_RX_SNIFF(p) ? "Rx" : "Tx");
 161                         break;
 162                 default:
 163                         break;
 164                 }
 165
 166                 ND_PRINT("VLAN %u%c, ", DSA_VID(p), DSA_TAGGED(p) ? 't' : 'u');
 167         }
 168 }
 169
 170 static void
 171 dsa_tag_print(netdissect_options *ndo, const u_char *bp)
 172 {
 173         if (ndo->ndo_eflag)
 174                 ND_PRINT("Marvell DSA ");
 175         else
 176                 ND_PRINT("DSA ");
 177         tag_common_print(ndo, bp);
 178 }
 179
 180 static void
 181 edsa_tag_print(netdissect_options *ndo, const u_char *bp)
 182 {
 183         const u_char *p = bp;
 184         uint16_t edsa_etype;
 185
 186         edsa_etype = GET_BE_U_2(p);
 187         if (ndo->ndo_eflag) {
 188                 ND_PRINT("Marvell EDSA ethertype 0x%04x (%s), ", edsa_etype,
 189                          tok2str(ethertype_values, "Unknown", edsa_etype));
 190                 ND_PRINT("rsvd %u %u, ", GET_U_1(p + 2), GET_U_1(p + 3));
 191         } else
 192                 ND_PRINT("EDSA 0x%04x, ", edsa_etype);
 193         p += 4;
 194         tag_common_print(ndo, p);
 195 }
 196
 197 void
 198 dsa_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 199 {
 200         u_int caplen = h->caplen;
 201         u_int length = h->len;
 202
 203         ndo->ndo_protocol = "dsa";
 204         ndo->ndo_ll_hdr_len +=
 205                 ether_switch_tag_print(ndo, p, length, caplen, dsa_tag_print, DSA_LEN);
 206 }
 207
 208 void
 209 edsa_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 210 {
 211         u_int caplen = h->caplen;
 212         u_int length = h->len;
 213
 214         ndo->ndo_protocol = "edsa";
 215         ndo->ndo_ll_hdr_len +=
 216                 ether_switch_tag_print(ndo, p, length, caplen, edsa_tag_print, EDSA_LEN);
 217 }