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Add UDP support to the checksum offload detection script.

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This commit is contained in:
Seth Hall 2013-10-24 15:21:03 -04:00
parent 08e6b6b4b4
commit 1cfb3a38e0
1 changed files with 15 additions and 1 deletions
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16
scripts/base/misc/find-checksum-offloading.bro
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@ -16,6 +16,7 @@ export {
# Keep track of how many bad checksums have been seen. # Keep track of how many bad checksums have been seen.
global bad_ip_checksums = 0; global bad_ip_checksums = 0;
global bad_tcp_checksums = 0; global bad_tcp_checksums = 0;
global bad_udp_checksums = 0;
# Track to see if this script is done so that messages aren't created multiple times. # Track to see if this script is done so that messages aren't created multiple times.
global done = F; global done = F;
@ -28,7 +29,11 @@ event ChecksumOffloading::check()
local pkts_recvd = net_stats()$pkts_recvd; local pkts_recvd = net_stats()$pkts_recvd;
local bad_ip_checksum_pct = (pkts_recvd != 0) ? (bad_ip_checksums*1.0 / pkts_recvd*1.0) : 0; local bad_ip_checksum_pct = (pkts_recvd != 0) ? (bad_ip_checksums*1.0 / pkts_recvd*1.0) : 0;
local bad_tcp_checksum_pct = (pkts_recvd != 0) ? (bad_tcp_checksums*1.0 / pkts_recvd*1.0) : 0; local bad_tcp_checksum_pct = (pkts_recvd != 0) ? (bad_tcp_checksums*1.0 / pkts_recvd*1.0) : 0;
if ( bad_ip_checksum_pct > 0.05 || bad_tcp_checksum_pct > 0.05 ) local bad_udp_checksum_pct = (pkts_recvd != 0) ? (bad_udp_checksums*1.0 / pkts_recvd*1.0) : 0;
if ( bad_ip_checksum_pct > 0.05 ||
bad_tcp_checksum_pct > 0.05 ||
bad_udp_checksum_pct > 0.05 )
{ {
local packet_src = reading_traces() ? "trace file likely has" : "interface is likely receiving"; local packet_src = reading_traces() ? "trace file likely has" : "interface is likely receiving";
local bad_checksum_msg = (bad_ip_checksum_pct > 0.0) ? "IP" : ""; local bad_checksum_msg = (bad_ip_checksum_pct > 0.0) ? "IP" : "";
@ -38,6 +43,13 @@ event ChecksumOffloading::check()
bad_checksum_msg += " and "; bad_checksum_msg += " and ";
bad_checksum_msg += "TCP"; bad_checksum_msg += "TCP";
} }
if ( bad_udp_checksum_pct > 0.0 )
{
if ( |bad_checksum_msg| > 0 )
bad_checksum_msg += " and ";
bad_checksum_msg += "UDP";
}
local message = fmt("Your %s invalid %s checksums, most likely from NIC checksum offloading.", packet_src, bad_checksum_msg); local message = fmt("Your %s invalid %s checksums, most likely from NIC checksum offloading.", packet_src, bad_checksum_msg);
Reporter::warning(message); Reporter::warning(message);
done = T; done = T;
@ -65,6 +77,8 @@ event conn_weird(name: string, c: connection, addl: string)
{ {
if ( name == "bad_TCP_checksum" ) if ( name == "bad_TCP_checksum" )
++bad_tcp_checksums; ++bad_tcp_checksums;
else if ( name == "bad_UDP_checksum" )
++bad_udp_checksums;
} }
event bro_done() event bro_done()