Merged in mileswdavis/scapy (pull request #126)

Add support for SPBM (Shortest Path Bridging)

scapy/contrib/spbm.py

+# IEEE 802.1aq - Shorest Path Bridging Mac-in-mac (SPBM):
+# Ethernet based link state protocol that enables Layer 2 Unicast, Layer 2 Multicast, Layer 3 Unicast, and Layer 3 Multicast virtualized services
+# https://en.wikipedia.org/wiki/IEEE_802.1aq
+# Modeled after the scapy VXLAN contribution
+#
+#############################################################
+# Example SPB Frame Creation
+# 
+# Note the outer Dot1Q Ethertype marking (0x88e7)
+#############################################################
+# backboneEther     = Ether(dst='00:bb:00:00:90:00', src='00:bb:00:00:40:00', type=0x8100)
+# backboneDot1Q     = Dot1Q(vlan=4051,type=0x88e7)
+# backboneServiceID = SPBM(prio=1,isid=20011)
+# customerEther     = Ether(dst='00:1b:4f:5e:ca:00',src='00:00:00:00:00:01',type=0x8100)
+# customerDot1Q     = Dot1Q(prio=1,vlan=11,type=0x0800)
+# customerIP        = IP(src='10.100.11.10',dst='10.100.12.10',id=0x0629,len=106)
+# customerUDP       = UDP(sport=1024,dport=1025,chksum=0,len=86)
+#
+# spb_example = backboneEther/backboneDot1Q/backboneServiceID/customerEther/customerDot1Q/customerIP/customerUDP/"Payload"
+
+from scapy.packet import Packet, bind_layers
+from scapy.layers.l2 import Ether
+from scapy.fields import *
+
+class SPBM(Packet):
+    name = "SPBM"
+    fields_desc = [ BitField("prio", 0, 3),
+                    BitField("dei", 0, 1),
+                    BitField("nca", 0, 1),
+                    BitField("res1", 0, 1),
+                    BitField("res2", 0, 2),
+                    ThreeBytesField("isid", 0)]
+
+    def mysummary(self):
+        return self.sprintf("SPBM (isid=%SPBM.isid%")
+
+bind_layers(Dot1Q, SPBM, type=0x88e7)
+bind_layers(SPBM, Ether)
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