[Patch] GRE Transparent Ethernet Bridge

[William J Hulley <bill.hulley () gmail com>]

Hi,

Try again, the attachment seems to have been dropped somewhere
last time.

Find attached a small patch to print ethernet frames encapsulated
in  GRE using the Transparent Ethernet Bridge ethertype (0x6558),
as used in a recent addition to the Linux kernel, gretap.

  -- bill

diff -cr tcpdump-4.0.0/ethertype.h tcpdump-4.0.0.patch/ethertype.h
*** tcpdump-4.0.0/ethertype.h   2008-09-01 03:44:13.000000000 +0100
--- tcpdump-4.0.0.patch/ethertype.h     2009-02-24 14:24:10.000000000  
+0000
***************
*** 76,81 ****
--- 76,84 ----
  #ifndef ETHERTYPE_SCA
  #define ETHERTYPE_SCA         0x6007
  #endif
+ #ifndef ETHERTYPE_TEB
+ #define ETHERTYPE_TEB         0x6558
+ #endif
  #ifndef       ETHERTYPE_LANBRIDGE
  #define       ETHERTYPE_LANBRIDGE     0x8038
  #endif
diff -cr tcpdump-4.0.0/print-ether.c tcpdump-4.0.0.patch/print-ether.c
*** tcpdump-4.0.0/print-ether.c 2008-09-01 03:44:22.000000000 +0100
--- tcpdump-4.0.0.patch/print-ether.c   2009-02-24 14:24:36.000000000  
+0000
***************
*** 56,61 ****
--- 56,62 ----
      { ETHERTYPE_DN,             "DN" },
      { ETHERTYPE_LAT,            "LAT" },
      { ETHERTYPE_SCA,            "SCA" },
+     { ETHERTYPE_TEB,            "TEB" },
      { ETHERTYPE_LANBRIDGE,      "Lanbridge" },
      { ETHERTYPE_DECDNS,         "DEC DNS" },
      { ETHERTYPE_DECDTS,         "DEC DTS" },
diff -cr tcpdump-4.0.0/print-gre.c tcpdump-4.0.0.patch/print-gre.c
*** tcpdump-4.0.0/print-gre.c   2008-09-01 03:44:23.000000000 +0100
--- tcpdump-4.0.0.patch/print-gre.c     2009-02-24 14:09:18.000000000  
+0000
***************
*** 225,230 ****
--- 225,233 ----
        case ETHERTYPE_GRE_ISO:
                isoclns_print(bp, len, len);
                break;
+       case ETHERTYPE_TEB:
+               ether_print(bp, len, len);
+               break;
        default:
                printf("gre-proto-0x%x", prot);
        }

--
William J Hulley
bill.hulley () gmail com



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