IPSEC: punt reasons; SPI=0, no-tunnel

Change-Id: If76992e283a27fa193a6865257ab3aa764066e48
Signed-off-by: Neale Ranns <nranns@cisco.com>

5 files changed, 155 insertions, 13 deletions

diff --git a/src/vnet/CMakeLists.txt b/src/vnet/CMakeLists.txt
index c96da2a6c57..89d46a14b82 100644
--- a/src/vnet/CMakeLists.txt
+++ b/src/vnet/CMakeLists.txt
@@ -556,6 +556,7 @@ list(APPEND VNET_SOURCES
   ipsec/ipsec_input.c
   ipsec/ipsec_if.c
   ipsec/ipsec_if_in.c
+  ipsec/ipsec_punt.c
   ipsec/ipsec_sa.c
   ipsec/ipsec_spd.c
   ipsec/ipsec_spd_policy.c
diff --git a/src/vnet/ipsec/ipsec_if_in.c b/src/vnet/ipsec/ipsec_if_in.c
index 9ba2c10bca6..b585c3d4dcf 100644
--- a/src/vnet/ipsec/ipsec_if_in.c
+++ b/src/vnet/ipsec/ipsec_if_in.c
@@ -22,12 +22,14 @@
 #include <vnet/ipsec/ipsec.h>
 #include <vnet/ipsec/esp.h>
 #include <vnet/ipsec/ipsec_io.h>
+#include <vnet/ipsec/ipsec_punt.h>
 
 /* Statistics (not really errors) */
 #define foreach_ipsec_if_input_error				  \
 _(RX, "good packets received")					  \
 _(DISABLED, "ipsec packets received on disabled interface")       \
-_(NO_TUNNEL, "no matching tunnel")
+_(NO_TUNNEL, "no matching tunnel")                                \
+_(SPI_0, "SPI 0")
 
 static char *ipsec_if_input_error_strings[] = {
 #define _(sym,string) string,
@@ -61,6 +63,46 @@ format_ipsec_if_input_trace (u8 * s, va_list * args)
   return s;
 }
 
+always_inline u16
+ipsec_ip4_if_no_tunnel (vlib_node_runtime_t * node,
+			vlib_buffer_t * b,
+			const esp_header_t * esp,
+			const ip4_header_t * ip4, u16 offset)
+{
+  if (PREDICT_FALSE (0 == esp->spi))
+    {
+      b->error = node->errors[IPSEC_IF_INPUT_ERROR_SPI_0];
+      b->punt_reason =
+	ipsec_punt_reason[(ip4->protocol == IP_PROTOCOL_UDP ?
+			   IPSEC_PUNT_IP4_SPI_UDP_0 : IPSEC_PUNT_IP4_SPI_0)];
+    }
+  else
+    {
+      b->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+      b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP4_NO_SUCH_TUNNEL];
+    }
+  vlib_buffer_advance (b, -offset);
+  return IPSEC_INPUT_NEXT_PUNT;
+}
+
+always_inline u16
+ipsec_ip6_if_no_tunnel (vlib_node_runtime_t * node,
+			vlib_buffer_t * b,
+			const esp_header_t * esp, u16 offset)
+{
+  if (PREDICT_FALSE (0 == esp->spi))
+    {
+      b->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+      b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP6_SPI_0];
+    }
+  else
+    {
+      b->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+      b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP6_NO_SUCH_TUNNEL];
+    }
+  vlib_buffer_advance (b, -offset);
+  return (IPSEC_INPUT_NEXT_PUNT);
+}
 
 always_inline uword
 ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
@@ -197,9 +239,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[0] =
+		    ipsec_ip6_if_no_tunnel (node, b[0], esp0, buf_adv0);
 		  n_no_tunnel++;
-		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto pkt1;
 		}
 	    }
@@ -225,9 +267,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[0] =
+		    ipsec_ip4_if_no_tunnel (node, b[0], esp0, ip40, buf_adv0);
 		  n_no_tunnel++;
-		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto pkt1;
 		}
 	    }
@@ -293,9 +335,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[1]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[1] =
+		    ipsec_ip6_if_no_tunnel (node, b[1], esp1, buf_adv1);
 		  n_no_tunnel++;
-		  next[1] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace1;
 		}
 	    }
@@ -321,9 +363,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[1]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[1] =
+		    ipsec_ip4_if_no_tunnel (node, b[1], esp1, ip41, buf_adv1);
 		  n_no_tunnel++;
-		  next[1] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace1;
 		}
 	    }
@@ -456,9 +498,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[0] =
+		    ipsec_ip6_if_no_tunnel (node, b[0], esp0, buf_adv0);
 		  n_no_tunnel++;
-		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace00;
 		}
 	    }
@@ -484,9 +526,9 @@ ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 		}
 	      else
 		{
-		  b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
+		  next[0] =
+		    ipsec_ip4_if_no_tunnel (node, b[0], esp0, ip40, buf_adv0);
 		  n_no_tunnel++;
-		  next[0] = IPSEC_INPUT_NEXT_DROP;
 		  goto trace00;
 		}
 	    }
diff --git a/src/vnet/ipsec/ipsec_io.h b/src/vnet/ipsec/ipsec_io.h
index f156b48360f..32668a0474f 100644
--- a/src/vnet/ipsec/ipsec_io.h
+++ b/src/vnet/ipsec/ipsec_io.h
@@ -27,6 +27,7 @@ typedef enum
 } ipsec_output_next_t;
 
 #define foreach_ipsec_input_next   \
+  _ (PUNT, "punt-dispatch")        \
   _ (DROP, "error-drop")
 
 #define _(v, s) IPSEC_INPUT_NEXT_##v,
diff --git a/src/vnet/ipsec/ipsec_punt.c b/src/vnet/ipsec/ipsec_punt.c
new file mode 100644
index 00000000000..357e9596cfc
--- /dev/null
+++ b/src/vnet/ipsec/ipsec_punt.c
@@ -0,0 +1,51 @@
+/*
+ * esp_decrypt.c : IPSec ESP decrypt node
+ *
+ * Copyright (c) 2015 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 <vnet/ipsec/ipsec.h>
+#include <vnet/ipsec/ipsec_punt.h>
+
+static vlib_punt_hdl_t punt_hdl;
+
+vlib_punt_reason_t ipsec_punt_reason[IPSEC_PUNT_N_REASONS];
+
+static clib_error_t *
+ipsec_punt_init (vlib_main_t * vm)
+{
+  clib_error_t *error;
+
+  if ((error = vlib_call_init_function (vm, punt_init)))
+    return (error);
+
+  punt_hdl = vlib_punt_client_register ("ipsec");
+
+#define _(s,v)  vlib_punt_reason_alloc (punt_hdl, v,                    \
+                                        &ipsec_punt_reason[IPSEC_PUNT_##s]);
+  foreach_ipsec_punt_reason
+#undef _
+    return (error);
+}
+
+VLIB_INIT_FUNCTION (ipsec_punt_init);
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ipsec/ipsec_punt.h b/src/vnet/ipsec/ipsec_punt.h
new file mode 100644
index 00000000000..19943273154
--- /dev/null
+++ b/src/vnet/ipsec/ipsec_punt.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019 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 __IPSEC_PUNT_H__
+#define __IPSEC_PUNT_H__
+
+#include <vlib/vlib.h>
+
+#define foreach_ipsec_punt_reason                             \
+  _(IP4_SPI_0, "ip4-spi-0")                                   \
+  _(IP6_SPI_0, "ip6-spi-0")                                   \
+  _(IP4_SPI_UDP_0, "ip4-spi-o-udp-0")                         \
+  _(IP4_NO_SUCH_TUNNEL, "ip4-no-such-tunnel")                 \
+  _(IP6_NO_SUCH_TUNNEL, "ip6-no-such-tunnel")
+
+typedef enum ipsec_punt_reason_t_
+{
+#define _(s,v) IPSEC_PUNT_##s,
+  foreach_ipsec_punt_reason
+#undef _
+    IPSEC_PUNT_N_REASONS,
+} ipsec_punt_reason_type_t;
+
+extern u8 *format_ipsec_punt_reason (u8 * s, va_list * args);
+
+extern vlib_punt_reason_t ipsec_punt_reason[IPSEC_PUNT_N_REASONS];
+
+#endif /* __IPSEC_SPD_H__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */