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, 195 insertions, 0 deletions

diff --git a/src/plugins/nsh/nsh-md2-ioam/md2_ioam_transit.c b/src/plugins/nsh/nsh-md2-ioam/md2_ioam_transit.c
new file mode 100644
index 00000000000..9ea5447eba8
--- /dev/null
+++ b/src/plugins/nsh/nsh-md2-ioam/md2_ioam_transit.c
@@ -0,0 +1,195 @@
+ /*
+  * 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.
+  */
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/udp/udp.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/lisp-gpe/lisp_gpe.h>
+#include <vnet/lisp-gpe/lisp_gpe_packet.h>
+#include <nsh/nsh.h>
+#include <nsh/nsh_packet.h>
+#include <nsh/nsh-md2-ioam/nsh_md2_ioam.h>
+#include <nsh/nsh-md2-ioam/nsh_md2_ioam_util.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/fib_entry.h>
+
+/* Statistics (not really errors) */
+#define foreach_nsh_md2_ioam_encap_transit_error    \
+_(ENCAPSULATED, "good packets encapsulated")
+
+static char *nsh_md2_ioam_encap_transit_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nsh_md2_ioam_encap_transit_error
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_ERROR_##sym,
+  foreach_nsh_md2_ioam_encap_transit_error
+#undef _
+    NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_ERROR,
+} nsh_md2_ioam_encap_transit_error_t;
+
+typedef enum
+{
+  NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT,
+  NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
+  NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT
+} nsh_md2_ioam_encap_transit_next_t;
+
+
+/* *INDENT-OFF* */
+VNET_FEATURE_INIT (nsh_md2_ioam_encap_transit, static) =
+{
+  .arc_name = "ip4-output",
+  .node_name = "nsh-md2-ioam-encap-transit",
+  .runs_before = VNET_FEATURES ("adj-midchain-tx"),
+};
+/* *INDENT-ON* */
+
+
+static uword
+nsh_md2_ioam_encap_transit (vlib_main_t * vm,
+			    vlib_node_runtime_t * node,
+			    vlib_frame_t * from_frame)
+{
+  u32 n_left_from, next_index, *from, *to_next;
+
+  from = vlib_frame_vector_args (from_frame);
+  n_left_from = from_frame->n_vectors;
+
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0 = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+	  ip4_header_t *ip0;
+	  u32 iph_offset = 0;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
+	  ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
+				  + iph_offset);
+
+	  /* just forward non ipv4 packets */
+	  if (PREDICT_FALSE
+	      ((ip0->ip_version_and_header_length & 0xF0) == 0x40))
+	    {
+	      /* ipv4 packets */
+	      udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
+	      if (PREDICT_FALSE
+		  ((ip0->protocol == IP_PROTOCOL_UDP) &&
+		   (clib_net_to_host_u16 (udp_hdr0->dst_port) ==
+		    UDP_DST_PORT_lisp_gpe)))
+		{
+
+		  /* Check the iOAM header */
+		  lisp_gpe_header_t *lisp_gpe_hdr0 =
+		    (lisp_gpe_header_t *) (udp_hdr0 + 1);
+		  nsh_base_header_t *nsh_hdr =
+		    (nsh_base_header_t *) (lisp_gpe_hdr0 + 1);
+
+		  if (PREDICT_FALSE
+		      (lisp_gpe_hdr0->next_protocol ==
+		       LISP_GPE_NEXT_PROTO_NSH) && (nsh_hdr->md_type == 2))
+		    {
+		      uword *t = NULL;
+		      nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
+		      fib_prefix_t key4;
+		      memset (&key4, 0, sizeof (key4));
+		      key4.fp_proto = FIB_PROTOCOL_IP4;
+		      key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
+		      t = hash_get_mem (hm->dst_by_ip4, &key4);
+		      if (t)
+			{
+			  vlib_buffer_advance (b0,
+					       (word) (sizeof
+						       (ethernet_header_t)));
+			  nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vm,
+								       node,
+								       b0,
+								       &next0,
+								       NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
+								       1
+								       /* use_adj */
+			    );
+			  vlib_buffer_advance (b0,
+					       -(word) (sizeof
+							(ethernet_header_t)));
+			}
+		    }
+		}
+	    }
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  return from_frame->n_vectors;
+}
+
+extern u8 *format_nsh_node_map_trace (u8 * s, va_list * args);
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nsh_md2_ioam_encap_transit_node) = {
+  .function = nsh_md2_ioam_encap_transit,
+  .name = "nsh-md2-ioam-encap-transit",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nsh_node_map_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(nsh_md2_ioam_encap_transit_error_strings),
+  .error_strings = nsh_md2_ioam_encap_transit_error_strings,
+
+  .n_next_nodes = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT,
+
+  .next_nodes = {
+        [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
+        [NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
+  },
+
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */