Initial GENEVE TUNNEL implementation and tests.

Notes on this first implementation:
* First version of the implementation does NOT support GENEVE OPTIONS
HEADER: it isn't well understood what the purpose of the OPTIONS will be and/or
what content would be placed in the variable option data;

Once the IETF work will evolve and further information will be available
it could be possible to modify the frame rewrite to contemplate the
actual GENEVE OPTIONS.

Change-Id: Iddfe6f408cc45bb0800f00ce6a3e302e48a4ed52
Signed-off-by: Marco Varlese <marco.varlese@suse.com>

1 files changed, 180 insertions, 0 deletions

diff --git a/src/vnet/geneve/geneve_packet.h b/src/vnet/geneve/geneve_packet.h
new file mode 100644
index 00000000000..87e5225f755
--- /dev/null
+++ b/src/vnet/geneve/geneve_packet.h
@@ -0,0 +1,180 @@
+/*
+ * Copyright (c) 2017 SUSE LLC.
+ * 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_vnet_geneve_packet_h
+#define included_vnet_geneve_packet_h
+
+/*
+ *
+ * As per draft https://tools.ietf.org/html/draft-ietf-nvo3-geneve-05
+ *
+ * Section 3.5
+ *
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |          Option Class         |      Type     |R|R|R| Length  |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                      Variable Option Data                     |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+#define GENEVE_MAX_OPT_LENGTH 128
+
+/*
+ *
+ * As per draft https://tools.ietf.org/html/draft-ietf-nvo3-geneve-05
+ *
+ * Section 7
+ *
+ * +----------------+--------------------------------------+
+ * | Option Class   | Description                          |
+ * +----------------+--------------------------------------+
+ * | 0x0000..0x00FF | Unassigned - IETF Review             |
+ * | 0x0100         | Linux                                |
+ * | 0x0101         | Open vSwitch                         |
+ * | 0x0102         | Open Virtual Networking (OVN)        |
+ * | 0x0103         | In-band Network Telemetry (INT)      |
+ * | 0x0104         | VMware                               |
+ * | 0x0105..0xFFEF | Unassigned - First Come First Served |
+ * | 0xFFF0..FFFF   | Experimental                         |
+ * +----------------+--------------------------------------+
+*/
+#define LINUX_OPT_CLASS  0x0100
+#define OVS_OPT_CLASS    0x0101
+#define OVN_OPT_CLASS    0x0102
+#define INT_OPT_CLASS    0x0103
+#define VMWARE_OPT_CLASS 0x0104
+
+typedef struct
+{
+  u16 opt_class;
+  u8 type;
+  u8 res:3;
+  u8 length:5;
+  u32 opt_data[];
+} geneve_options_t;
+
+/*
+ *
+ * As per draft https://tools.ietf.org/html/draft-ietf-nvo3-geneve-05
+ *
+ * Section 3/3.4
+ *
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |Ver|  Opt Len  |O|C|    Rsvd.  |          Protocol Type        |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |        Virtual Network Identifier (VNI)       |    Reserved   |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                    Variable Length Options                    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ */
+#define GENEVE_BASE_HEADER_LENGTH   8	// GENEVE BASE HEADER in bytes
+#define GENEVE_MAX_TOTAL_HDR_LENGTH 260
+
+#define GENEVE_VERSION 0
+#define GENEVE_ETH_PROTOCOL 0x6558
+
+typedef struct
+{
+  u8 ver:2;
+  u8 opt_len:6;
+  u8 oam_frame:1;
+  u8 critical_options:1;
+  u8 res1:6;
+  u16 protocol;
+  u32 vni:24;
+  u8 res2;
+  geneve_options_t opts[];
+} geneve_header_t;
+
+static inline u32
+vnet_get_geneve_vni (geneve_header_t * h)
+{
+  return (clib_net_to_host_u32 (h->vni) >> 8);
+}
+
+static inline void
+vnet_set_geneve_vni (geneve_header_t * h, u32 vni)
+{
+  h->vni = clib_host_to_net_u32 (vni << 8);
+}
+
+static inline u8
+vnet_get_geneve_version (geneve_header_t * h)
+{
+  return (clib_net_to_host_u32 (h->ver) >> 30);
+}
+
+static inline void
+vnet_set_geneve_version (geneve_header_t * h, u8 version)
+{
+  h->ver = clib_host_to_net_u32 (version << 30);
+}
+
+static inline u8
+vnet_get_geneve_options_len (geneve_header_t * h)
+{
+  return (clib_net_to_host_u32 (h->opt_len) >> 24);
+}
+
+static inline void
+vnet_set_geneve_options_len (geneve_header_t * h, u8 len)
+{
+  h->opt_len = clib_host_to_net_u32 (len << 24);
+}
+
+static inline u8
+vnet_get_geneve_oamframe_bit (geneve_header_t * h)
+{
+  return (clib_net_to_host_u32 (h->oam_frame) >> 23);
+}
+
+static inline void
+vnet_set_geneve_oamframe_bit (geneve_header_t * h, u8 oam)
+{
+  h->oam_frame = clib_host_to_net_u32 (oam << 23);
+}
+
+static inline u8
+vnet_get_geneve_critical_bit (geneve_header_t * h)
+{
+  return (clib_net_to_host_u32 (h->critical_options) >> 22);
+}
+
+static inline void
+vnet_set_geneve_critical_bit (geneve_header_t * h, u8 critical_opts)
+{
+  h->critical_options = clib_host_to_net_u32 (critical_opts << 22);
+}
+
+static inline u16
+vnet_get_geneve_protocol (geneve_header_t * h)
+{
+  return clib_net_to_host_u32 (h->protocol);
+}
+
+static inline void
+vnet_set_geneve_protocol (geneve_header_t * h, u16 protocol)
+{
+  h->protocol = clib_host_to_net_u32 (protocol);
+}
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */