BIER

- see draft-ietf-bier-mpls-encapsulation-10
- midpoint, head and tail functions
- supported payload protocols; IPv4 and IPv6 only.

Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb
Signed-off-by: Neale Ranns <nranns@cisco.com>

2 files changed, 72 insertions, 8 deletions

diff --git a/test/patches/scapy-2.3.3/bier.patch b/test/patches/scapy-2.3.3/bier.patch
new file mode 100644
index 00000000000..024805d0501
--- /dev/null
+++ b/test/patches/scapy-2.3.3/bier.patch
@@ -0,0 +1,45 @@
+diff --git a/scapy/contrib/bier.py b/scapy/contrib/bier.py
+new file mode 100644
+index 0000000..e173cdb
+--- /dev/null
++++ b/scapy/contrib/bier.py
+@@ -0,0 +1,39 @@
++# http://trac.secdev.org/scapy/ticket/31
++
++# scapy.contrib.description = MPLS
++# scapy.contrib.status = loads
++
++from scapy.packet import *
++from scapy.fields import *
++from scapy.layers.inet import IP
++from scapy.layers.inet6 import IPv6
++
++class BIERLength:
++   BIER_LEN_64 = 0
++   BIER_LEN_128 = 1
++   BIER_LEN_256 = 2
++
++
++
++BIERnhcls = {  1: "MPLS",
++               2: "MPLS",
++               4: "IPv4",
++               5: "IPv6" }
++
++class BIER(Packet):
++   name = "BIER"
++   fields_desc =  [ BitField("id", 5, 4),
++                    BitField("version", 0, 4),
++                    BitField("length", 0, 4),
++                    BitField("entropy", 0, 20),
++                    BitField("OAM", 0, 2),
++                    BitField("RSV", 0, 2),
++                    BitField("DSCP", 0, 6),
++                    BitEnumField("Proto", 2, 6, BIERnhcls),
++                    ShortField("BFRID", 0),
++                    StrFixedLenField("BitString",
++                                     chr(255)*32, 32) ]
++
++
++bind_layers(BIER, IP,   Proto=4)
++bind_layers(BIER, IPv6, Proto=5)
diff --git a/test/patches/scapy-2.3.3/mpls.py.patch b/test/patches/scapy-2.3.3/mpls.py.patch
index f63a70a3cd7..f3293e8eee2 100644
--- a/test/patches/scapy-2.3.3/mpls.py.patch
+++ b/test/patches/scapy-2.3.3/mpls.py.patch
@@ -1,16 +1,35 @@
 diff --git a/scapy/contrib/mpls.py b/scapy/contrib/mpls.py
-index 640a0c5..6af1d4a 100644
+index 640a0c5..944723a 100644
 --- a/scapy/contrib/mpls.py
 +++ b/scapy/contrib/mpls.py
-@@ -18,6 +18,8 @@ class MPLS(Packet):
+@@ -6,6 +6,7 @@
+ from scapy.packet import Packet, bind_layers, Padding
+ from scapy.fields import BitField,ByteField
+ from scapy.layers.inet import IP
++from scapy.contrib.bier import BIER
+ from scapy.layers.inet6 import IPv6
+ from scapy.layers.l2 import Ether, GRE
+ 
+@@ -17,9 +18,12 @@ class MPLS(Packet):
  
     def guess_payload_class(self, payload):
-        if len(payload) >= 1:
-+           if not self.s:
-+              return MPLS
-            ip_version = (ord(payload[0]) >> 4) & 0xF
-            if ip_version == 4:
-                return IP
+-       if len(payload) >= 1:
+-           ip_version = (ord(payload[0]) >> 4) & 0xF
+-           if ip_version == 4:
+-               return IP
+-           elif ip_version == 6:
+-               return IPv6
+-       return Padding
++         if not self.s:
++             return MPLS
++         ip_version = (ord(payload[0]) >> 4) & 0xF
++         if ip_version == 4:
++            return IP
++         elif ip_version == 5:
++            return BIER
++         elif ip_version == 6:
++            return IPv6
++         return Padding
 @@ -27,3 +29,4 @@ class MPLS(Packet):
  
  bind_layers(Ether, MPLS, type=0x8847)