GBP V2

update the GBP plugin to implement the full NAT feature set of opflex agent

Change-Id: Ic06a039c889445ed0b9087fa1f292634192b0f8d
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

1 files changed, 231 insertions, 0 deletions

diff --git a/src/plugins/gbp/gbp_policy.c b/src/plugins/gbp/gbp_policy.c
new file mode 100644
index 00000000000..8f3fc76a019
--- /dev/null
+++ b/src/plugins/gbp/gbp_policy.c
@@ -0,0 +1,231 @@
+/*
+ * 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.
+ */
+
+#include <plugins/gbp/gbp.h>
+
+/**
+ * Grouping of global data for the GBP source EPG classification feature
+ */
+typedef struct gbp_policy_main_t_
+{
+  /**
+   * Next nodes for L2 output features
+   */
+  u32 l2_output_feat_next[32];
+} gbp_policy_main_t;
+
+static gbp_policy_main_t gbp_policy_main;
+
+#define foreach_gbp_policy                      \
+  _(DENY,    "deny")
+
+typedef enum
+{
+#define _(sym,str) GBP_ERROR_##sym,
+  foreach_gbp_policy
+#undef _
+    GBP_POLICY_N_ERROR,
+} gbp_policy_error_t;
+
+static char *gbp_policy_error_strings[] = {
+#define _(sym,string) string,
+  foreach_gbp_policy
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) GBP_POLICY_NEXT_##sym,
+  foreach_gbp_policy
+#undef _
+    GBP_POLICY_N_NEXT,
+} gbp_policy_next_t;
+
+/**
+ * per-packet trace data
+ */
+typedef struct gbp_policy_trace_t_
+{
+  /* per-pkt trace data */
+  epg_id_t src_epg;
+  epg_id_t dst_epg;
+  u32 acl_index;
+} gbp_policy_trace_t;
+
+static uword
+gbp_policy (vlib_main_t * vm,
+	    vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  gbp_policy_main_t *gpm = &gbp_policy_main;
+  u32 n_left_from, *from, *to_next;
+  u32 next_index;
+
+  next_index = 0;
+  n_left_from = frame->n_vectors;
+  from = vlib_frame_vector_args (frame);
+
+  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)
+	{
+	  gbp_policy_next_t next0;
+	  gbp_contract_key_t key0;
+	  u32 bi0, sw_if_index0;
+	  vlib_buffer_t *b0;
+	  u32 acl_index0;
+
+	  next0 = GBP_POLICY_NEXT_DENY;
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  /*
+	   * determine the src and dst EPG
+	   */
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+	  key0.gck_dst = gbp_port_to_epg (sw_if_index0);
+	  key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
+	  acl_index0 = ~0;
+
+	  if (~0 != key0.gck_src)
+	    {
+	      if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
+		{
+		  /*
+		   * intra-epg allowed
+		   */
+		  next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
+						L2OUTPUT_FEAT_GBP_POLICY);
+		}
+	      else
+		{
+		  acl_index0 = gbp_acl_lookup (&key0);
+
+		  if (~0 != acl_index0)
+		    {
+		      /*
+		       * TODO tests against the ACL
+		       */
+		      /*
+		       * ACL tables are not available outside of ACL plugin
+		       * until then bypass the ACL to next node
+		       */
+		      next0 =
+			vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
+					      L2OUTPUT_FEAT_GBP_POLICY);
+		    }
+		}
+	    }
+	  else
+	    {
+	      /*
+	       * the src EPG is not set when the packet arrives on an EPG
+	       * uplink interface and we do not need to apply policy
+	       */
+	      next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
+					    L2OUTPUT_FEAT_GBP_POLICY);
+	    }
+
+	  if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      gbp_policy_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->src_epg = key0.gck_src;
+	      t->dst_epg = key0.gck_dst;
+	      t->acl_index = acl_index0;
+	    }
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  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 frame->n_vectors;
+}
+
+/* packet trace format function */
+static u8 *
+format_gbp_policy_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
+
+  s =
+    format (s, "src:%d, dst:%d, acl:%d", t->src_epg, t->dst_epg,
+	    t->acl_index);
+
+  return s;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (gbp_policy_node) = {
+  .function = gbp_policy,
+  .name = "gbp-policy",
+  .vector_size = sizeof (u32),
+  .format_trace = format_gbp_policy_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(gbp_policy_error_strings),
+  .error_strings = gbp_policy_error_strings,
+
+  .n_next_nodes = GBP_POLICY_N_NEXT,
+
+  .next_nodes = {
+    [GBP_POLICY_NEXT_DENY] = "error-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gbp_policy_node, gbp_policy);
+
+/* *INDENT-ON* */
+
+static clib_error_t *
+gbp_policy_init (vlib_main_t * vm)
+{
+  gbp_policy_main_t *gpm = &gbp_policy_main;
+
+  /* Initialize the feature next-node indexes */
+  feat_bitmap_init_next_nodes (vm,
+			       gbp_policy_node.index,
+			       L2OUTPUT_N_FEAT,
+			       l2output_get_feat_names (),
+			       gpm->l2_output_feat_next);
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (gbp_policy_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */