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This is a hack. Decode IEEE 802.1Q VLAN tagging so that we can decode

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tagged traffic according to the encapsulated protocol.  It needs in
addition modifications to the filter generator which would deal with
checking the ethertype and vlan header as required.
This commit is contained in:
Garrett Wollman 1997-12-08 21:42:35 +00:00
parent e0572d523f
commit 0bfc6e6706
1 changed files with 7 additions and 0 deletions
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7
contrib/tcpdump/print-ether.c
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@ -158,6 +158,13 @@ int
ether_encap_print(u_short ethertype, const u_char *p,
u_int length, u_int caplen)
{
if (ethertype == 0x8100) { /* IEEE 802.1Q vlan tagging encapsulation */
printf ("[vlan %d] ", ntohs(*(u_short *)p) & 0x17ff);
ethertype = ntohs(((u_short *)p)[1]);
p += 4;
length -= 4;
caplen -= 4;
}
extracted_ethertype = ethertype;
switch (ethertype) {