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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
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