Port NSH plugin to VPP

Please refer to https://wiki.fd.io/view/NSH_SFC

Change-Id: Iba7e33e4dbb064c1527aaddbe8dce4b6b63a627a
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/src/plugins/nsh/nsh-md2-ioam/nsh_md2_ioam_util.h b/src/plugins/nsh/nsh-md2-ioam/nsh_md2_ioam_util.h
new file mode 100644
index 00000000000..8fbb3b7aaf7
--- /dev/null
+++ b/src/plugins/nsh/nsh-md2-ioam/nsh_md2_ioam_util.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2017 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_nsh_md2_ioam_util_h__
+#define __included_nsh_md2_ioam_util_h__
+
+#include <vnet/lisp-gpe/lisp_gpe.h>
+#include <vnet/lisp-gpe/lisp_gpe_packet.h>
+#include <vnet/ip/ip.h>
+#include <nsh/nsh.h>
+#include <nsh/nsh-md2-ioam/nsh_md2_ioam.h>
+#include <nsh/nsh_packet.h>
+
+
+extern nsh_option_map_t *nsh_md2_lookup_option (u16 class, u8 type);
+
+
+typedef struct
+{
+  u8 trace_data[256];
+} nsh_transit_trace_t;
+
+always_inline void
+nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vlib_main_t * vm,
+					     vlib_node_runtime_t * node,
+					     vlib_buffer_t * b0,
+					     u32 * next0, u32 drop_node_val,
+					     u8 use_adj)
+{
+  ip4_header_t *ip0;
+  udp_header_t *udp_hdr0;
+  lisp_gpe_header_t *lisp_gpe_hdr0;
+  nsh_base_header_t *nsh_hdr;
+  nsh_tlv_header_t *opt0;
+  nsh_tlv_header_t *limit0;
+  nsh_main_t *hm = &nsh_main;
+  nsh_option_map_t *nsh_option;
+
+  /* Populate the iOAM header */
+  ip0 = vlib_buffer_get_current (b0);
+  udp_hdr0 = (udp_header_t *) (ip0 + 1);
+  lisp_gpe_hdr0 = (lisp_gpe_header_t *) (udp_hdr0 + 1);
+  nsh_hdr = (nsh_base_header_t *) (lisp_gpe_hdr0 + 1);
+  opt0 = (nsh_tlv_header_t *) (nsh_hdr + 1);
+  limit0 =
+    (nsh_tlv_header_t *) ((u8 *) opt0 + (nsh_hdr->length * 4) -
+			  sizeof (nsh_base_header_t));
+
+  /*
+   * Basic validity checks
+   */
+  if ((nsh_hdr->length * 4) > clib_net_to_host_u16 (ip0->length))
+    {
+      *next0 = drop_node_val;
+      return;
+    }
+
+  if (nsh_hdr->md_type != 2)
+    {
+      *next0 = drop_node_val;
+      return;
+    }
+
+  /* Scan the set of h-b-h options, process ones that we understand */
+  while (opt0 < limit0)
+    {
+      u8 type0;
+      type0 = opt0->type;
+      switch (type0)
+	{
+	case 0:		/* Pad1 */
+	  opt0 = (nsh_tlv_header_t *) ((u8 *) opt0) + 1;
+	  continue;
+	case 1:		/* PadN */
+	  break;
+	default:
+	  nsh_option = nsh_md2_lookup_option (opt0->class, opt0->type);
+	  if ((nsh_option != NULL) && (hm->options[nsh_option->option_id]))
+	    {
+	      if ((*hm->options[nsh_option->option_id]) (b0, opt0) < 0)
+		{
+		  *next0 = drop_node_val;
+		  return;
+		}
+	    }
+	  break;
+	}
+      opt0 =
+	(nsh_tlv_header_t *) (((u8 *) opt0) + opt0->length +
+			      sizeof (nsh_tlv_header_t));
+    }
+
+
+  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+    {
+      nsh_transit_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
+      clib_memcpy (&(tr->trace_data), nsh_hdr, (nsh_hdr->length * 4));
+    }
+  return;
+}
+
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */