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

   1 // Copyright (c) 2018 Arista Networks, Inc.  All rights reserved.
   2
   3 /* \summary: EtherType protocol for Arista Networks printer */
   4
   5 #ifdef HAVE_CONFIG_H
   6 #include "config.h"
   7 #endif
   8
   9 #include <netdissect-stdinc.h>
  10
  11 #include <string.h>
  12
  13 #include "netdissect.h"
  14 #include "interface.h"
  15 #include "extract.h"
  16 #include "addrtoname.h"
  17
  18 #define ARISTA_SUBTYPE_TIMESTAMP 0x01
  19
  20 #define ARISTA_TIMESTAMP_V1 0x10
  21 #define ARISTA_TIMESTAMP_V2 0x20
  22
  23 int
  24 arista_ethertype_print(netdissect_options *ndo, const u_char *bp, u_int len _U_)
  25 {
  26         uint16_t subTypeId;
  27         uint16_t version;
  28         u_short bytesConsumed = 0;
  29         u_short size = 0;
  30
  31         ndo->ndo_protocol = "arista";
  32
  33         subTypeId = GET_BE_U_2(bp);
  34         bp += 2;
  35         version = GET_BE_U_2(bp);
  36         bp += 2;
  37         bytesConsumed += 4;
  38
  39         ND_PRINT("SubType: 0x%1X, Version: 0x%02x, ", subTypeId, version);
  40
  41         // TapAgg Header Timestamping
  42         if (subTypeId == ARISTA_SUBTYPE_TIMESTAMP) {
  43                 // Timestamp has 32-bit lsb in nanosec and remaining msb in sec
  44
  45                 switch (version) {
  46                 case ARISTA_TIMESTAMP_V1:
  47                         ND_PRINT("Timestamp TAI(64-bit)");
  48                         ND_PRINT(": Seconds: %u,", GET_BE_U_4(bp));
  49                         ND_PRINT(" Nanoseconds: %u, ", GET_BE_U_4(bp + 4));
  50                         bytesConsumed += size + 8;
  51                         break;
  52                 case ARISTA_TIMESTAMP_V2:
  53                         ND_PRINT("Timestamp (48-bit)");
  54                         ND_PRINT(": Seconds %u,", GET_BE_U_2(bp));
  55                         ND_PRINT(" Nanoseconds %u, ", GET_BE_U_4(bp + 2));
  56                         bytesConsumed += size + 6;
  57                         break;
  58                 default:
  59                         ND_PRINT("Unknown timestamp Version 0x%02X ", version);
  60                         return -1;
  61                 }
  62         } else {
  63                 return -1;
  64         }
  65         return bytesConsumed;
  66 }