classifier-based ACL: refactor + add output ACL

For implementation of MACIP ACLs enhancement (VPP-1088), an outbound
classifier-based ACL would be needed. There was an existing incomplete
code for outbound ACLs, it looked almost exact copy of input ACLs, minus
the various enhancements, trying to sync that code seemed error-prone
and cumbersome to maintain in the longer run.

This change refactors the input+output ACLs processing into a unified
routine (thus any changes will have effect on both), and also adds
the API to set the output interface ACL, with the same format
and semantics as the existing input one (except working on output
ACL of course).

WARNING: IP outbound ACL in L3 mode clobbers the ip.* fields
in the vnet_buffer_opaque_t, since the code is using l2_classify.*
The net_buffer (p0)->ip.save_rewrite_length is rescued into
l2_classify.pad.l2_len, and used to rewind the header in case of
drop, so that ipX_drop prints something sensible.

Change-Id: I62f814f1e3650e504474a3a5359edb8a0a8836ed
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/vnet/classify/in_out_acl.h b/src/vnet/classify/in_out_acl.h
new file mode 100644
index 00000000000..be0323055d8
--- /dev/null
+++ b/src/vnet/classify/in_out_acl.h
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+#ifndef __included_vnet_in_out_acl_h__
+#define __included_vnet_in_out_acl_h__
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/classify/vnet_classify.h>
+
+typedef enum
+{
+  ACL_NEXT_INDEX_DENY,
+  ACL_NEXT_INDEX_N_NEXT,
+} acl_next_index_t;
+
+typedef enum
+{
+  IN_OUT_ACL_TABLE_IP4,
+  IN_OUT_ACL_TABLE_IP6,
+  IN_OUT_ACL_TABLE_L2,
+  IN_OUT_ACL_N_TABLES,
+} in_out_acl_table_id_t;
+
+typedef enum
+{
+  IN_OUT_ACL_INPUT_TABLE_GROUP,
+  IN_OUT_ACL_OUTPUT_TABLE_GROUP,
+  IN_OUT_ACL_N_TABLE_GROUPS
+} in_out_acl_table_group_id_t;
+
+typedef struct
+{
+
+  /* classifier table vectors */
+  u32
+    * classify_table_index_by_sw_if_index[IN_OUT_ACL_N_TABLE_GROUPS]
+    [IN_OUT_ACL_N_TABLES];
+
+  /* convenience variables */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+  vnet_classify_main_t *vnet_classify_main;
+    vnet_config_main_t
+    * vnet_config_main[IN_OUT_ACL_N_TABLE_GROUPS][IN_OUT_ACL_N_TABLES];
+} in_out_acl_main_t;
+
+extern in_out_acl_main_t in_out_acl_main;
+
+int vnet_set_in_out_acl_intfc (vlib_main_t * vm, u32 sw_if_index,
+			       u32 ip4_table_index,
+			       u32 ip6_table_index,
+			       u32 l2_table_index, u32 is_add, u32 is_output);
+
+int vnet_set_input_acl_intfc (vlib_main_t * vm, u32 sw_if_index,
+			      u32 ip4_table_index,
+			      u32 ip6_table_index,
+			      u32 l2_table_index, u32 is_add);
+
+int vnet_set_output_acl_intfc (vlib_main_t * vm, u32 sw_if_index,
+			       u32 ip4_table_index,
+			       u32 ip6_table_index,
+			       u32 l2_table_index, u32 is_add);
+
+#endif /* __included_vnet_in_out_acl_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */