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Fixing link-layer handling.

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Something had gotten mixed up here.
This commit is contained in:
Robin Sommer 2014-09-06 10:34:24 -07:00
parent 4a66a8e341
commit 5c6dfb2408
2 changed files with 22 additions and 15 deletions
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32
src/iosource/PktSrc.cc
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@ -291,8 +291,7 @@ void PktSrc::Process()
&& protocol != 30 )
{
Weird("non_ip_packet_in_null_transport", &current_packet);
data = 0;
return;
goto done;
}
break;
@ -307,12 +306,21 @@ void PktSrc::Process()
{
// MPLS carried over the ethernet frame.
case 0x8847:
// Remove the data link layer and denote a
// header size of zero before the IP header.
have_mpls = true;
data += GetLinkHeaderSize(props.link_type);
pkt_hdr_size = 0;
break;
// VLAN carried over the ethernet frame.
case 0x8100:
data += GetLinkHeaderSize(props.link_type);
// Check for MPLS in VLAN.
if ( ((data[2] << 8) + data[3]) == 0x8847 )
have_mpls = true;
data += 4; // Skip the vlan header
pkt_hdr_size = 0;
@ -337,8 +345,7 @@ void PktSrc::Process()
{
// Neither IPv4 nor IPv6.
Weird("non_ip_packet_in_pppoe_encapsulation", &current_packet);
data = 0;
return;
goto done;
}
break;
}
@ -352,15 +359,19 @@ void PktSrc::Process()
protocol = (data[2] << 8) + data[3];
if ( protocol == 0x0281 )
// MPLS Unicast
{
// MPLS Unicast. Remove the data link layer and
// denote a header size of zero before the IP header.
have_mpls = true;
data += GetLinkHeaderSize(props.link_type);
pkt_hdr_size = 0;
}
else if ( protocol != 0x0021 && protocol != 0x0057 )
{
// Neither IPv4 nor IPv6.
Weird("non_ip_packet_in_ppp_encapsulation", &current_packet);
data = 0;
return;
goto done;
}
break;
}
@ -368,12 +379,6 @@ void PktSrc::Process()
if ( have_mpls )
{
// Remove the data link layer
data += GetLinkHeaderSize(props.link_type);
// Denote a header size of zero before the IP header
pkt_hdr_size = 0;
// Skip the MPLS label stack.
bool end_of_stack = false;
@ -395,6 +400,7 @@ void PktSrc::Process()
else
net_packet_dispatch(current_packet.ts, current_packet.hdr, data, pkt_hdr_size, this);
done:
have_packet = 0;
DoneWithPacket();
}