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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.
*/
/*
* Policy NAT.
* Match packet against rule in a hash and translate according to given
* instructions. Rules are kept in a flow-cache bihash. Instructions in a pool
* of translation entries.
*
* All rules for a given interface/direction must use the same lookup pattern.
* E.g. SA+SP.
*
* A dynamic NAT would punt to slow path on a miss in the flow cache, in this
* case the miss behaviour is configurable. Default behaviour is pass packet
* along unchanged.
*
* The data structures are shared and assuming that updates to the tables are
* rare. Data-structures are protected depending on the API/CLI barriers.
*/
#include <stdbool.h>
#include <vlib/vlib.h>
#include <pnat/pnat.api_enum.h> /* For error counters */
#include "pnat_node.h" /* Graph nodes */
VLIB_NODE_FN(pnat_input_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) {
return pnat_node_inline(vm, node, frame, PNAT_IP4_INPUT, VLIB_RX);
}
VLIB_NODE_FN(pnat_output_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) {
return pnat_node_inline(vm, node, frame, PNAT_IP4_OUTPUT, VLIB_TX);
}
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE(pnat_input_node) = {
.name = "pnat-input",
.vector_size = sizeof(u32),
.format_trace = format_pnat_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = PNAT_N_ERROR,
.error_counters = pnat_error_counters,
.n_next_nodes = PNAT_N_NEXT,
.next_nodes =
{
[PNAT_NEXT_DROP] = "error-drop",
},
};
VLIB_REGISTER_NODE(pnat_output_node) = {
.name = "pnat-output",
.vector_size = sizeof(u32),
.format_trace = format_pnat_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = PNAT_N_ERROR,
.error_counters = pnat_error_counters,
.sibling_of = "pnat-input",
};
#endif
/* Hook up features */
VNET_FEATURE_INIT(pnat_input, static) = {
.arc_name = "ip4-unicast",
.node_name = "pnat-input",
.runs_after = VNET_FEATURES("ip4-sv-reassembly-feature"),
};
VNET_FEATURE_INIT(pnat_output, static) = {
.arc_name = "ip4-output",
.node_name = "pnat-output",
.runs_after = VNET_FEATURES("ip4-sv-reassembly-output-feature"),
};
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