Improve handling of IPv6 routing type 0 extension headers.

- flow_weird event with name argument value of "routing0_hdr" is raised
  for packets containing an IPv6 routing type 0 header because this
  type of header is now deprecated according to RFC 5095.

- packets with a routing type 0 header and non-zero segments left
  now use the last address in that header in order to associate
  with a connection/flow and for calculating TCP/UDP checksums.

- added a set of IPv4/IPv6 TCP/UDP checksum unit tests

testing/btest/Baseline/core.checksums/bad.out

@@ -0,0 +1,9 @@
+1332784981.078396 weird: bad_IP_checksum
+1332784885.686428 weird: bad_TCP_checksum
+1332784933.501023 weird: bad_UDP_checksum
+1332785210.013051 weird: routing0_hdr
+1332785210.013051 weird: bad_TCP_checksum
+1332782580.798420 weird: routing0_hdr
+1332782580.798420 weird: bad_UDP_checksum
+1332785250.469132 weird: bad_TCP_checksum
+1332781342.923813 weird: bad_UDP_checksum

testing/btest/Baseline/core.checksums/good.out

@@ -0,0 +1,2 @@
+1332785125.596793 weird: routing0_hdr
+1332782508.592037 weird: routing0_hdr

testing/btest/Baseline/core.ipv6_ext_headers/output

@@ -1 +1,3 @@
+weird routing0_hdr from 2001:4f8:4:7:2e0:81ff:fe52:ffff to 2001:78:1:32::2
+[orig_h=2001:4f8:4:7:2e0:81ff:fe52:ffff, orig_p=53/udp, resp_h=2001:78:1:32::2, resp_p=53/udp]
 [ip=<uninitialized>, ip6=[class=0, flow=0, len=59, nxt=0, hlim=64, src=2001:4f8:4:7:2e0:81ff:fe52:ffff, dst=2001:4f8:4:7:2e0:81ff:fe52:9a6b, exts=[[id=0, hopopts=[nxt=43, len=0, options=[[otype=1, len=4, data=\0\0\0\0]]], dstopts=<uninitialized>, routing=<uninitialized>, fragment=<uninitialized>, ah=<uninitialized>, esp=<uninitialized>], [id=43, hopopts=<uninitialized>, dstopts=<uninitialized>, routing=[nxt=17, len=4, rtype=0, segleft=2, data=\0\0\0\0 ^A\0x\0^A\02\0\0\0\0\0\0\0^A ^A\0x\0^A\02\0\0\0\0\0\0\0^B], fragment=<uninitialized>, ah=<uninitialized>, esp=<uninitialized>]]], tcp=<uninitialized>, udp=[sport=53/udp, dport=53/udp, ulen=11], icmp=<uninitialized>]

testing/btest/bifs/routing0_data_to_addrs.test

@@ -1,4 +1,4 @@
-# @TEST-EXEC: bro -C -b -r $TRACES/ext_hdr_hbh_routing.trace %INPUT >output
+# @TEST-EXEC: bro -b -r $TRACES/ipv6-hbh-routing0.trace %INPUT >output
 # @TEST-EXEC: btest-diff output
 
 event ipv6_ext_headers(c: connection, p: pkt_hdr)

testing/btest/core/checksums.test

@@ -0,0 +1,15 @@
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip4-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip4-tcp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip4-udp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-route0-tcp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-route0-udp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-tcp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-udp-bad-chksum.pcap >>bad.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip4-tcp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip4-udp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-route0-tcp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-route0-udp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-tcp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: bro -b -r $TRACES/chksums/ip6-udp-good-chksum.pcap >>good.out 2>&1
+# @TEST-EXEC: btest-diff bad.out
+# @TEST-EXEC: btest-diff good.out

testing/btest/core/ipv6_ext_headers.test

@@ -1,10 +1,22 @@
-# @TEST-EXEC: bro -C -b -r $TRACES/ext_hdr_hbh_routing.trace %INPUT >output
+# @TEST-EXEC: bro -b -r $TRACES/ipv6-hbh-routing0.trace %INPUT >output
 # @TEST-EXEC: btest-diff output
 
 # Just check that the event is raised correctly for a packet containing
 # extension headers.
-
 event ipv6_ext_headers(c: connection, p: pkt_hdr)
 	{
 	print p;
 	}
+
+# Also check the weird for routing type 0 extensions headers
+event flow_weird(name: string, src: addr, dst: addr)
+	{
+	print fmt("weird %s from %s to %s", name, src, dst);
+	}
+
+# And the connection for routing type 0 packets with non-zero segments left
+# should use the last address in that extension header.
+event new_connection(c: connection)
+	{
+	print c$id;
+	}