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Add ERSPAN Type I patch

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Co-authored-by: Markel Elorza Alvarez <melorzaalvarez@gmail.com>
Co-authored-by: Ivan Arrizabalaga Cupido <ivanarrcup@gmail.com>
This commit is contained in:
Gorka Olalde Mendia 2021-03-17 11:43:53 +01:00
parent c9c0fea8d0
commit fcc866567c
1 changed files with 17 additions and 6 deletions
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23
src/packet_analysis/protocol/gre/GRE.cc
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@ -99,13 +99,24 @@ bool GREAnalyzer::AnalyzePacket(size_t len, const uint8_t* data, Packet* packet)
else if ( proto_typ == 0x88be ) else if ( proto_typ == 0x88be )
{ {
// ERSPAN type II if ( len > gre_len + 14 )
if ( len > gre_len + 14 + 8 )
{ {
erspan_len = 8; // ERSPAN type I
eth_len = 14; erspan_len = 0;
gre_link_type = DLT_EN10MB; eth_len = 14;
proto_typ = ntohs(*((uint16_t*)(data + gre_len + erspan_len + eth_len - 2))); gre_link_type = DLT_EN10MB;
bool have_sequence_header = ( flags_ver & 0x1000 );
if( have_sequence_header )
{
// ERSPAN type II
erspan_len += 8;
if ( len < gre_len + eth_len + erspan_len )
{
Weird("truncated_GRE", packet);
return false;
}
}
proto_typ = ntohs(*((uint16_t *) (data + gre_len + erspan_len + eth_len - 2)));
} }
else else
{ {