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, 537 insertions, 0 deletions

diff --git a/src/plugins/gbp/gbp_policy_dpo.c b/src/plugins/gbp/gbp_policy_dpo.c
new file mode 100644
index 00000000000..bfe5974f807
--- /dev/null
+++ b/src/plugins/gbp/gbp_policy_dpo.c
@@ -0,0 +1,537 @@
+/*
+ * 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>
+#include <plugins/gbp/gbp_policy_dpo.h>
+#include <plugins/gbp/gbp_recirc.h>
+
+#include <vnet/dpo/dvr_dpo.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/dpo/load_balance.h>
+
+/**
+ * DPO pool
+ */
+static gbp_policy_dpo_t *gbp_policy_dpo_pool;
+
+/**
+ * DPO type registered for these GBP FWD
+ */
+static dpo_type_t gbp_policy_dpo_type;
+
+static inline gbp_policy_dpo_t *
+gbp_policy_dpo_get_i (index_t index)
+{
+  return (pool_elt_at_index (gbp_policy_dpo_pool, index));
+}
+
+gbp_policy_dpo_t *
+gbp_policy_dpo_get (index_t index)
+{
+  return (gbp_policy_dpo_get_i (index));
+}
+
+static gbp_policy_dpo_t *
+gbp_policy_dpo_alloc (void)
+{
+  gbp_policy_dpo_t *gpd;
+
+  pool_get (gbp_policy_dpo_pool, gpd);
+
+  return (gpd);
+}
+
+static inline gbp_policy_dpo_t *
+gbp_policy_dpo_get_from_dpo (const dpo_id_t * dpo)
+{
+  ASSERT (gbp_policy_dpo_type == dpo->dpoi_type);
+
+  return (gbp_policy_dpo_get_i (dpo->dpoi_index));
+}
+
+static inline index_t
+gbp_policy_dpo_get_index (gbp_policy_dpo_t * gpd)
+{
+  return (gpd - gbp_policy_dpo_pool);
+}
+
+static void
+gbp_policy_dpo_lock (dpo_id_t * dpo)
+{
+  gbp_policy_dpo_t *gpd;
+
+  gpd = gbp_policy_dpo_get_from_dpo (dpo);
+  gpd->gpd_locks++;
+}
+
+static void
+gbp_policy_dpo_unlock (dpo_id_t * dpo)
+{
+  gbp_policy_dpo_t *gpd;
+
+  gpd = gbp_policy_dpo_get_from_dpo (dpo);
+  gpd->gpd_locks--;
+
+  if (0 == gpd->gpd_locks)
+    {
+      dpo_reset (&gpd->gpd_dpo);
+      pool_put (gbp_policy_dpo_pool, gpd);
+    }
+}
+
+void
+gbp_policy_dpo_add_or_lock (dpo_proto_t dproto,
+			    epg_id_t epg, u32 sw_if_index, dpo_id_t * dpo)
+{
+  gbp_policy_dpo_t *gpd;
+  dpo_id_t parent = DPO_INVALID;
+
+  gpd = gbp_policy_dpo_alloc ();
+  memset (gpd, 0, sizeof (*gpd));
+
+  gpd->gpd_proto = dproto;
+  gpd->gpd_sw_if_index = sw_if_index;
+  gpd->gpd_epg = epg;
+
+  /*
+   * stack on the DVR DPO for the output interface
+   */
+  dvr_dpo_add_or_lock (sw_if_index, dproto, &parent);
+
+  dpo_stack (gbp_policy_dpo_type, dproto, &gpd->gpd_dpo, &parent);
+
+  dpo_set (dpo, gbp_policy_dpo_type, dproto, gbp_policy_dpo_get_index (gpd));
+}
+
+u8 *
+format_gbp_policy_dpo (u8 * s, va_list * ap)
+{
+  index_t index = va_arg (*ap, index_t);
+  u32 indent = va_arg (*ap, u32);
+  gbp_policy_dpo_t *gpd = gbp_policy_dpo_get_i (index);
+  vnet_main_t *vnm = vnet_get_main ();
+
+  s = format (s, "gbp-policy-dpo: %U, epg:%d out:%U",
+	      format_dpo_proto, gpd->gpd_proto,
+	      gpd->gpd_epg,
+	      format_vnet_sw_if_index_name, vnm, gpd->gpd_sw_if_index);
+  s = format (s, "\n%U", format_white_space, indent + 2);
+  s = format (s, "%U", format_dpo_id, &gpd->gpd_dpo, indent + 4);
+
+  return (s);
+}
+
+const static dpo_vft_t gbp_policy_dpo_vft = {
+  .dv_lock = gbp_policy_dpo_lock,
+  .dv_unlock = gbp_policy_dpo_unlock,
+  .dv_format = format_gbp_policy_dpo,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a glean
+ *        object.
+ *
+ * this means that these graph nodes are ones from which a glean is the
+ * parent object in the DPO-graph.
+ */
+const static char *const gbp_policy_dpo_ip4_nodes[] = {
+  "ip4-gbp-policy-dpo",
+  NULL,
+};
+
+const static char *const gbp_policy_dpo_ip6_nodes[] = {
+  "ip6-gbp-policy-dpo",
+  NULL,
+};
+
+const static char *const *const gbp_policy_dpo_nodes[DPO_PROTO_NUM] = {
+  [DPO_PROTO_IP4] = gbp_policy_dpo_ip4_nodes,
+  [DPO_PROTO_IP6] = gbp_policy_dpo_ip6_nodes,
+};
+
+dpo_type_t
+gbp_policy_dpo_get_type (void)
+{
+  return (gbp_policy_dpo_type);
+}
+
+static clib_error_t *
+gbp_policy_dpo_module_init (vlib_main_t * vm)
+{
+  gbp_policy_dpo_type = dpo_register_new_type (&gbp_policy_dpo_vft,
+					       gbp_policy_dpo_nodes);
+
+  return (NULL);
+}
+
+VLIB_INIT_FUNCTION (gbp_policy_dpo_module_init);
+
+typedef struct gbp_policy_dpo_trace_t_
+{
+  u32 src_epg;
+  u32 dst_epg;
+  u32 acl_index;
+} gbp_policy_dpo_trace_t;
+
+typedef enum
+{
+  GBP_POLICY_DROP,
+  GBP_POLICY_N_NEXT,
+} gbp_policy_next_t;
+
+always_inline uword
+gbp_policy_dpo_inline (vlib_main_t * vm,
+		       vlib_node_runtime_t * node,
+		       vlib_frame_t * from_frame, fib_protocol_t fproto)
+{
+  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)
+	{
+	  const gbp_policy_dpo_t *gpd0;
+	  u32 bi0, next0, acl_index0;
+	  gbp_contract_key_t key0;
+	  vlib_buffer_t *b0;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+	  next0 = GBP_POLICY_DROP;
+	  acl_index0 = ~0;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  gpd0 =
+	    gbp_policy_dpo_get_i (vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
+	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = gpd0->gpd_dpo.dpoi_index;
+
+	  key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
+	  key0.gck_dst = gpd0->gpd_epg;
+
+	  if (~0 != key0.gck_src)
+	    {
+	      if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
+		{
+		  /*
+		   * intra-epg allowed
+		   */
+		  next0 = gpd0->gpd_dpo.dpoi_next_node;
+		}
+	      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 = gpd0->gpd_dpo.dpoi_next_node;
+		    }
+		}
+	    }
+	  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 = gpd0->gpd_dpo.dpoi_next_node;
+	    }
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      gbp_policy_dpo_trace_t *tr;
+
+	      tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
+	      tr->src_epg = key0.gck_src;
+	      tr->dst_epg = key0.gck_dst;
+	      tr->acl_index = acl_index0;
+	    }
+
+	  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;
+}
+
+static u8 *
+format_gbp_policy_dpo_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_dpo_trace_t *t = va_arg (*args, gbp_policy_dpo_trace_t *);
+
+  s = format (s, " src-epg:%d dst-epg:%d acl-index:%d",
+	      t->src_epg, t->dst_epg, t->acl_index);
+
+  return s;
+}
+
+static uword
+ip4_gbp_policy_dpo (vlib_main_t * vm,
+		    vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+  return (gbp_policy_dpo_inline (vm, node, from_frame, FIB_PROTOCOL_IP4));
+}
+
+static uword
+ip6_gbp_policy_dpo (vlib_main_t * vm,
+		    vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+  return (gbp_policy_dpo_inline (vm, node, from_frame, FIB_PROTOCOL_IP6));
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_gbp_policy_dpo_node) = {
+    .function = ip4_gbp_policy_dpo,
+    .name = "ip4-gbp-policy-dpo",
+    .vector_size = sizeof (u32),
+    .format_trace = format_gbp_policy_dpo_trace,
+    .n_next_nodes = GBP_POLICY_N_NEXT,
+    .next_nodes =
+    {
+        [GBP_POLICY_DROP] = "ip4-drop",
+    }
+};
+VLIB_REGISTER_NODE (ip6_gbp_policy_dpo_node) = {
+    .function = ip6_gbp_policy_dpo,
+    .name = "ip6-gbp-policy-dpo",
+    .vector_size = sizeof (u32),
+    .format_trace = format_gbp_policy_dpo_trace,
+    .n_next_nodes = GBP_POLICY_N_NEXT,
+    .next_nodes =
+    {
+        [GBP_POLICY_DROP] = "ip6-drop",
+    }
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_gbp_policy_dpo_node, ip4_gbp_policy_dpo)
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_gbp_policy_dpo_node, ip6_gbp_policy_dpo)
+/* *INDENT-ON* */
+
+ /**
+ * per-packet trace data
+ */
+typedef struct gbp_classify_trace_t_
+{
+  /* per-pkt trace data */
+  epg_id_t src_epg;
+} gbp_classify_trace_t;
+
+typedef enum gbp_lpm_classify_next_t_
+{
+  GPB_LPM_CLASSIFY_DROP,
+} gbp_lpm_classify_next_t;
+
+/*
+ * Determine the SRC EPG from a LPM
+ */
+always_inline uword
+gbp_lpm_classify_inline (vlib_main_t * vm,
+			 vlib_node_runtime_t * node,
+			 vlib_frame_t * frame, fib_protocol_t fproto)
+{
+  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)
+	{
+	  u32 bi0, sw_if_index0, fib_index0, lbi0;
+	  gbp_lpm_classify_next_t next0;
+	  const gbp_policy_dpo_t *gpd0;
+	  const gbp_recirc_t *gr0;
+	  const dpo_id_t *dpo0;
+	  load_balance_t *lb0;
+	  ip4_header_t *ip4_0;
+	  ip6_header_t *ip6_0;
+	  vlib_buffer_t *b0;
+	  epg_id_t src_epg0;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+	  next0 = GPB_LPM_CLASSIFY_DROP;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  gr0 = gbp_recirc_get (sw_if_index0);
+	  fib_index0 = gr0->gr_fib_index[fproto];
+
+	  if (FIB_PROTOCOL_IP4 == fproto)
+	    {
+	      ip4_0 = vlib_buffer_get_current (b0);
+	      lbi0 = ip4_fib_forwarding_lookup (fib_index0,
+						&ip4_0->src_address);
+	    }
+	  else
+	    {
+	      ip6_0 = vlib_buffer_get_current (b0);
+	      lbi0 = ip6_fib_table_fwding_lookup (&ip6_main, fib_index0,
+						  &ip6_0->src_address);
+	    }
+
+	  lb0 = load_balance_get (lbi0);
+	  dpo0 = load_balance_get_bucket_i (lb0, 0);
+
+	  if (gbp_policy_dpo_type == dpo0->dpoi_type)
+	    {
+	      gpd0 = gbp_policy_dpo_get_i (dpo0->dpoi_index);
+	      src_epg0 = gpd0->gpd_epg;
+	      vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX],
+				 &next0, b0);
+	    }
+	  else
+	    {
+	      /* could not classify => drop */
+	      src_epg0 = 0;
+	    }
+
+	  vnet_buffer2 (b0)->gbp.src_epg = src_epg0;
+
+	  if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      gbp_classify_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->src_epg = src_epg0;
+	    }
+
+	  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;
+}
+
+static uword
+gbp_ip4_lpm_classify (vlib_main_t * vm,
+		      vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return (gbp_lpm_classify_inline (vm, node, frame, FIB_PROTOCOL_IP4));
+}
+
+static uword
+gbp_ip6_lpm_classify (vlib_main_t * vm,
+		      vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  return (gbp_lpm_classify_inline (vm, node, frame, FIB_PROTOCOL_IP6));
+}
+
+ /* packet trace format function */
+static u8 *
+format_gbp_classify_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_classify_trace_t *t = va_arg (*args, gbp_classify_trace_t *);
+
+  s = format (s, "src-epg:%d", t->src_epg);
+
+  return s;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (gbp_ip4_lpm_classify_node) = {
+  .function = gbp_ip4_lpm_classify,
+  .name = "ip4-gbp-lpm-classify",
+  .vector_size = sizeof (u32),
+  .format_trace = format_gbp_classify_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [GPB_LPM_CLASSIFY_DROP] = "ip4-drop"
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gbp_ip4_lpm_classify_node, gbp_ip4_lpm_classify);
+
+VLIB_REGISTER_NODE (gbp_ip6_lpm_classify_node) = {
+  .function = gbp_ip6_lpm_classify,
+  .name = "ip6-gpb-lpm-classify",
+  .vector_size = sizeof (u32),
+  .format_trace = format_gbp_classify_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [GPB_LPM_CLASSIFY_DROP] = "ip6-drop"
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (gbp_ip6_lpm_classify_node, gbp_ip6_lpm_classify);
+
+VNET_FEATURE_INIT (gbp_ip4_lpm_classify_feat_node, static) =
+{
+  .arc_name = "ip4-unicast",
+  .node_name = "ip4-gbp-lpm-classify",
+  .runs_before = VNET_FEATURES ("nat44-out2in"),
+};
+VNET_FEATURE_INIT (gbp_ip6_lpm_classify_feat_node, static) =
+{
+  .arc_name = "ip6-unicast",
+  .node_name = "ip6-gbp-lpm-classify",
+  .runs_before = VNET_FEATURES ("nat66-out2in"),
+};
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */