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BIT-1950: support PPPoE over QinQ

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This commit is contained in:
Jon Siwek 2018-07-06 08:04:02 -05:00
parent 15d74ac081
commit ad9abd4c9b
4 changed files with 54 additions and 54 deletions
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96
src/iosource/Packet.cc
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@ -149,36 +149,17 @@ void Packet::ProcessLayer2()
pdata += GetLinkHeaderSize(link_type);
switch ( protocol )
bool saw_vlan = false;
while ( protocol == 0x8100 || protocol == 0x9100 ||
protocol == 0x8864 )
{
// MPLS carried over the ethernet frame.
case 0x8847:
have_mpls = true;
break;
// VLAN carried over the ethernet frame.
// 802.1q / 802.1ad
case 0x8100:
case 0x9100:
if ( pdata + 4 >= end_of_data )
{
Weird("truncated_link_header");
return;
}
vlan = ((pdata[0] << 8) + pdata[1]) & 0xfff;
protocol = ((pdata[2] << 8) + pdata[3]);
pdata += 4; // Skip the vlan header
// Check for MPLS in VLAN.
if ( protocol == 0x8847 )
{
have_mpls = true;
break;
}
// Check for double-tagged (802.1ad)
if ( protocol == 0x8100 || protocol == 0x9100 )
switch ( protocol )
{
// VLAN carried over the ethernet frame.
// 802.1q / 802.1ad
case 0x8100:
case 0x9100:
{
if ( pdata + 4 >= end_of_data )
{
@ -186,39 +167,46 @@ void Packet::ProcessLayer2()
return;
}
inner_vlan = ((pdata[0] << 8) + pdata[1]) & 0xfff;
auto& vlan_ref = saw_vlan ? inner_vlan : vlan;
vlan_ref = ((pdata[0] << 8) + pdata[1]) & 0xfff;
protocol = ((pdata[2] << 8) + pdata[3]);
pdata += 4; // Skip the vlan header
saw_vlan = true;
eth_type = protocol;
}
break;
eth_type = protocol;
break;
// PPPoE carried over the ethernet frame.
case 0x8864:
if ( pdata + 8 >= end_of_data )
// PPPoE carried over the ethernet frame.
case 0x8864:
{
Weird("truncated_link_header");
return;
if ( pdata + 8 >= end_of_data )
{
Weird("truncated_link_header");
return;
}
protocol = (pdata[6] << 8) + pdata[7];
pdata += 8; // Skip the PPPoE session and PPP header
if ( protocol == 0x0021 )
l3_proto = L3_IPV4;
else if ( protocol == 0x0057 )
l3_proto = L3_IPV6;
else
{
// Neither IPv4 nor IPv6.
Weird("non_ip_packet_in_pppoe_encapsulation");
return;
}
}
protocol = (pdata[6] << 8) + pdata[7];
pdata += 8; // Skip the PPPoE session and PPP header
if ( protocol == 0x0021 )
l3_proto = L3_IPV4;
else if ( protocol == 0x0057 )
l3_proto = L3_IPV6;
else
{
// Neither IPv4 nor IPv6.
Weird("non_ip_packet_in_pppoe_encapsulation");
return;
}
break;
break;
}
}
// Check for MPLS in VLAN.
if ( protocol == 0x8847 )
have_mpls = true;
// Normal path to determine Layer 3 protocol.
if ( ! have_mpls && l3_proto == L3_UNKNOWN )
{