vxlan-gbp: Add support for vxlan gbp

This patch implements vxlan with extension of group based
policy support.

Change-Id: I70405bf7332c02867286da8958d9652837edd3c2
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

1 files changed, 150 insertions, 0 deletions

diff --git a/src/vnet/vxlan-gbp/vxlan_gbp_packet.h b/src/vnet/vxlan-gbp/vxlan_gbp_packet.h
new file mode 100644
index 00000000000..e1674a0dba8
--- /dev/null
+++ b/src/vnet/vxlan-gbp/vxlan_gbp_packet.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef __included_vxlan_gbp_packet_h__
+#define __included_vxlan_gbp_packet_h__ 1
+
+/*
+ * From draft-smith-vxlan-group-policy-04.txt
+ *
+ *  0                   1                   2                   3
+ *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |G|R|R|R|I|R|R|R|R|D|E|S|A|R|R|R|        Group Policy ID        |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                VXLAN Network Identifier (VNI) |   Reserved    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * G bit: Bit 0 of the initial word is defined as the G (Group Based
+ *   Policy Extension) bit.
+ *
+ * I bit: where the I flag MUST be set to 1 for a valid
+ *   VXLAN Network ID (VNI).
+ *
+ * D bit: Bit 9 of the initial word is defined as the Don't Learn bit.
+ *   When set, this bit indicates that the egress VTEP MUST NOT learn the
+ *   source address of the encapsulated frame.
+ *
+ * E bit: Bit 10 of the initial word is defined as the bounce packet.
+ *   When set, this bit indicates that packet is bounced and must be
+ *   dropped.
+ *
+ * S bit: Bit 11 of the initial word is defined as the source policy
+ *   applied bit.
+ *
+ * A bit: Bit 12 of the initial word is defined as the A (Policy
+ *   Applied) bit.  This bit is only defined as the A bit when the G bit
+ *   is set to 1.
+ *
+ *    A = 1 indicates that the group policy has already been applied to
+ *    this packet.  Policies MUST NOT be applied by devices when the A
+ *    bit is set.
+ *
+ *    A = 0 indicates that the group policy has not been applied to this
+ *    packet.  Group policies MUST be applied by devices when the A bit
+ *    is set to 0 and the destination Group has been determined.
+ *    Devices that apply the Group policy MUST set the A bit to 1 after
+ *    the policy has been applied.
+ *
+ * Group Policy ID: 16 bit identifier that indicates the source TSI
+ *   Group membership being encapsulated by VXLAN. Its value is source
+ *   class id.
+ *
+ */
+
+typedef struct
+{
+  union
+  {
+    struct
+    {
+      union
+      {
+	struct
+	{
+	  u8 flag_g_i;
+	  u8 gpflags;
+	};
+	u16 flags;
+      };
+      u16 sclass;
+    };
+    u32 flags_sclass_as_u32;
+  };
+  u32 vni_reserved;
+} vxlan_gbp_header_t;
+
+#define VXLAN_GBP_FLAGS_G 0x80
+#define VXLAN_GBP_FLAGS_I 0x08
+
+#define foreach_vxlan_gbp_gpflags \
+_ (0x40, D)                       \
+_ (0x20, E)                       \
+_ (0x10, S)                       \
+_ (0x08, A)
+
+typedef enum
+{
+#define _(n,f) VXLAN_GBP_GPFLAGS_##f = n,
+  foreach_vxlan_gbp_gpflags
+#undef _
+} vxlan_gbp_gpflag_t;
+
+static inline u32
+vxlan_gbp_get_vni (vxlan_gbp_header_t * h)
+{
+  u32 vni_reserved_host_byte_order;
+
+  vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
+  return vni_reserved_host_byte_order >> 8;
+}
+
+static inline u16
+vxlan_gbp_get_sclass (vxlan_gbp_header_t * h)
+{
+  u16 sclass_host_byte_order;
+
+  sclass_host_byte_order = clib_net_to_host_u16 (h->sclass);
+  return sclass_host_byte_order;
+}
+
+static inline u8
+vxlan_gbp_get_gpflags (vxlan_gbp_header_t * h)
+{
+  return h->gpflags;
+}
+
+static inline u8
+vxlan_gbp_get_flags (vxlan_gbp_header_t * h)
+{
+  return h->flag_g_i;
+}
+
+static inline void
+vxlan_gbp_set_header (vxlan_gbp_header_t * h, u32 vni)
+{
+  h->vni_reserved = clib_host_to_net_u32 (vni << 8);
+  h->flags_sclass_as_u32 = 0;
+  h->flag_g_i = VXLAN_GBP_FLAGS_I | VXLAN_GBP_FLAGS_G;
+}
+
+#endif /* __included_vxlan_gbp_packet_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */