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

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