tests: add tests for ERSPAN Type I and Type II.

Author: guyharris

tests/TESTLIST

@@ -558,6 +558,15 @@ bfd-raw-auth-md5-v bfd-raw-auth-md5.pcap bfd-raw-auth-md5-v.out -v
 bfd-raw-auth-sha1 bfd-raw-auth-sha1.pcap bfd-raw-auth-sha1.out
 bfd-raw-auth-sha1-v bfd-raw-auth-sha1.pcap bfd-raw-auth-sha1-v.out -v
 
+# ERSPAN tests
+erspan-type-i-1		erspan-type-i-1.pcap	erspan-type-i-1.out	-v
+erspan-type-i-2		erspan-type-i-2.pcap	erspan-type-i-2.out	-v
+erspan-type-i-3		erspan-type-i-3.pcap	erspan-type-i-3.out	-v
+erspan-type-i-4		erspan-type-i-4.pcap	erspan-type-i-4.out	-v
+erspan-type-ii-1	erspan-type-ii-1.pcap	erspan-type-ii-1.out	-v
+erspan-type-ii-2	erspan-type-ii-2.pcap	erspan-type-ii-2.out	-v
+erspan-type-ii-3	erspan-type-ii-3.pcap	erspan-type-ii-3.out	-v
+
 # bad packets from Hanno Böck
 # heap-overflow-1 is in non-bsd.tests
 heap-overflow-2	heap-overflow-2.pcap		heap-overflow-2.out	-v

tests/erspan-type-i-1.out

@@ -0,0 +1,8 @@
+    1  13:09:59.174316 IP (tos 0xfc, ttl 32, id 0, offset 0, flags [none], proto GRE (47), length 126)
+    1.1.1.1 > 192.168.255.5: GREv0, Flags [none], length 106
+	erspan type1: IP (tos 0x0, ttl 255, id 40771, offset 0, flags [none], proto ICMP (1), length 84)
+    10.52.128.233 > 10.52.128.234: ICMP echo request, id 44114, seq 3, length 64
+    2  13:09:59.174822 IP (tos 0xfc, ttl 32, id 0, offset 0, flags [none], proto GRE (47), length 126)
+    1.1.1.1 > 192.168.255.5: GREv0, Flags [none], length 106
+	erspan type1: IP (tos 0x0, ttl 255, id 40771, offset 0, flags [none], proto ICMP (1), length 84)
+    10.52.128.234 > 10.52.128.233: ICMP echo reply, id 44114, seq 3, length 64

tests/erspan-type-i-1.pcap

@@ -0,0 +1,8 @@
+    1  13:09:59.174316 IP (tos 0xfc, ttl 32, id 0, offset 0, flags [none], proto GRE (47), length 126)
+    1.1.1.1 > 192.168.255.5: GREv0, Flags [none], length 106
+	erspan type1: IP (tos 0x0, ttl 255, id 40771, offset 0, flags [none], proto ICMP (1), length 84)
+    10.52.128.233 > 10.52.128.234: ICMP echo request, id 44114, seq 3, length 64
+    2  13:09:59.174822 IP (tos 0xfc, ttl 32, id 0, offset 0, flags [none], proto GRE (47), length 126)
+    1.1.1.1 > 192.168.255.5: GREv0, Flags [none], length 106
+	erspan type1: IP (tos 0x0, ttl 255, id 40771, offset 0, flags [none], proto ICMP (1), length 84)
+    10.52.128.234 > 10.52.128.233: ICMP echo reply, id 44114, seq 3, length 64

tests/erspan-type-i-2.out

@@ -0,0 +1,3 @@
+    1  14:37:10.555050 IP (tos 0x0, ttl 254, id 0, offset 0, flags [none], proto GRE (47), length 88)
+    192.168.90.17 > 192.168.90.127: GREv0, Flags [none], length 68
+	erspan type1: ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.90.253 tell 192.168.90.100, length 46

tests/erspan-type-i-2.pcap

@@ -0,0 +1,10 @@
+    1  18:53:28.139390 IP (tos 0xfc, ttl 251, id 171, offset 0, flags [DF], proto GRE (47), length 108)
+    1.1.1.2 > 192.168.255.5: GREv0, Flags [sequence# present], seq 171, length 88
+	erspan type2 session 666 cos 6 index 32760: IP (tos 0xc0, ttl 1, id 23540, offset 0, flags [none], proto PIM (103), length 58)
+    10.48.6.1 > 224.0.0.13: PIMv2, length 38
+	Hello, cksum 0xc530 (correct)
+	  Hold Time Option (1), length 2, Value: 1m45s
+	  Generation ID Option (20), length 4, Value: 0x2c6ceec0
+	  DR Priority Option (19), length 4, Value: 1
+	  State Refresh Capability Option (21), length 4, Value: v1
+	  Unknown Option (65004), length 0, Value: