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| author | wollman <wollman@FreeBSD.org> | 1997-12-08 21:42:35 +0000 |
|---|---|---|
| committer | wollman <wollman@FreeBSD.org> | 1997-12-08 21:42:35 +0000 |
| commit | 0890a7ca8a5890b2f7da4618ab3e281cff8918b0 (patch) | |
| tree | 952272c19cc541ce438a0c1133571336791c752e /contrib/tcpdump/print-ether.c | |
| parent | 990e34ed3a014b94bb4b78fddc32fac9fa7a1d40 (diff) | |
| download | FreeBSD-src-0890a7ca8a5890b2f7da4618ab3e281cff8918b0.zip FreeBSD-src-0890a7ca8a5890b2f7da4618ab3e281cff8918b0.tar.gz | |
This is a hack. Decode IEEE 802.1Q VLAN tagging so that we can decode
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.
Diffstat (limited to 'contrib/tcpdump/print-ether.c')
| -rw-r--r-- | contrib/tcpdump/print-ether.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-ether.c b/contrib/tcpdump/print-ether.c index 2c92d4f..cabbe2b 100644 --- a/contrib/tcpdump/print-ether.c +++ b/contrib/tcpdump/print-ether.c @@ -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) { |
