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-rw-r--r--src/plugins/nat/pnat/pnat.h121
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diff --git a/src/plugins/nat/pnat/pnat.h b/src/plugins/nat/pnat/pnat.h
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+/*
+ * Copyright (c) 2021 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_pnat_h
+#define included_pnat_h
+
+#include <stdbool.h>
+#include <vnet/ip/ip4_packet.h>
+#include <vppinfra/bihash_16_8.h>
+
+#define PNAT_FLOW_HASH_BUCKETS 256
+
+/* Definitions from pnat.api */
+#include <pnat/pnat.api_types.h>
+typedef vl_api_pnat_5tuple_t pnat_5tuple_t;
+typedef vl_api_pnat_mask_t pnat_mask_t;
+typedef vl_api_pnat_attachment_point_t pnat_attachment_point_t;
+
+/* Rewrite instructions */
+typedef enum {
+ PNAT_INSTR_NONE = 1 << 0,
+ PNAT_INSTR_SOURCE_ADDRESS = 1 << 1,
+ PNAT_INSTR_SOURCE_PORT = 1 << 2,
+ PNAT_INSTR_DESTINATION_ADDRESS = 1 << 3,
+ PNAT_INSTR_DESTINATION_PORT = 1 << 4,
+} pnat_instructions_t;
+
+typedef struct {
+ u64 as_u64[2];
+} pnat_mask_fast_t;
+
+/* Session cache entries */
+typedef struct {
+ /* What to translate to */
+ pnat_instructions_t instructions;
+
+ /* Stored in network byte order */
+ ip4_address_t post_sa;
+ ip4_address_t post_da;
+ u16 post_sp;
+ u16 post_dp;
+
+ /* Used for trace/show commands */
+ pnat_5tuple_t match;
+ pnat_5tuple_t rewrite;
+} pnat_translation_t;
+
+/* Interface object */
+typedef struct {
+ u32 sw_if_index;
+ pnat_mask_t lookup_mask[PNAT_ATTACHMENT_POINT_MAX];
+ pnat_mask_fast_t lookup_mask_fast[PNAT_ATTACHMENT_POINT_MAX];
+
+ /* Feature chain enabled on interface */
+ bool enabled[PNAT_ATTACHMENT_POINT_MAX];
+
+ u32 refcount;
+} pnat_interface_t;
+
+/* Globals */
+typedef struct {
+ bool enabled;
+
+ clib_bihash_16_8_t flowhash; /* Bi-directional */
+
+ /* Interface pool */
+ pnat_interface_t *interfaces;
+ u32 *interface_by_sw_if_index;
+
+ /* Translations pool */
+ pnat_translation_t *translations;
+
+ u16 msg_id_base;
+} pnat_main_t;
+extern pnat_main_t pnat_main;
+
+pnat_interface_t *pnat_interface_by_sw_if_index(u32 sw_if_index);
+
+/* Packet trace information */
+typedef struct {
+ u32 pool_index;
+ pnat_5tuple_t match;
+ pnat_5tuple_t rewrite;
+} pnat_trace_t;
+
+int pnat_binding_add(pnat_5tuple_t *match, pnat_5tuple_t *rewrite,
+ u32 *binding_index);
+int pnat_binding_del(u32 binding_index);
+int pnat_binding_attach(u32 sw_if_index, pnat_attachment_point_t attachment,
+ u32 binding_index);
+int pnat_binding_detach(u32 sw_if_index, pnat_attachment_point_t attachment,
+ u32 binding_index);
+u32 pnat_flow_lookup(u32 sw_if_index, pnat_attachment_point_t attachment,
+ pnat_5tuple_t *match);
+
+static inline void
+pnat_calc_key(u32 sw_if_index, pnat_attachment_point_t attachment,
+ ip4_address_t src, ip4_address_t dst, u8 protocol, u16 sport,
+ u16 dport, pnat_mask_fast_t mask, clib_bihash_kv_16_8_t *kv) {
+ kv->key[0] = kv->key[1] = 0;
+ kv->key[0] = (u64)src.as_u32 << 32 | dst.as_u32;
+ kv->key[0] &= mask.as_u64[0];
+ kv->key[1] |=
+ (u64)protocol << 56 | (u64)sw_if_index << 36 | (u64)attachment << 32;
+ kv->key[1] |= sport << 16 | dport;
+ kv->key[1] &= mask.as_u64[1];
+}
+
+#endif