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/*
* Copyright (c) 2020 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 __UDP_TUNNEL__
#define __UDP_TUNNEL__
#include <vlib/vlib.h>
#include <vppinfra/error.h>
#include <vnet/udp/udp_encap.h>
/**
* @file udp_tunnel.h
*
* This file implements bidirectional udp tunnels. Udp tunnels exploit
* the udp encap functionality in vpp. In particular, a udp tunnel creates
* an udp encap object with the information for encapsulating packets and it
* implements the udp decap node. The udp decap node checks if a udp tunnel
* exists before performing the decapsulation. If the tunnel does not exist the
* packet is dropped.
*/
#define UDP_TUNNEL_INVALID ~0
extern dpo_type_t dpo_type_udp_ip4;
extern dpo_type_t dpo_type_udp_ip6;
extern vlib_node_registration_t udp4_decap_node;
extern vlib_node_registration_t udp6_decap_node;
/**
* @brief Create a udp tunnel
*
* @param proto FIB_PROTOCOL_IP4 or FIB_PROTOCOL_IP6
* @param fib_index fib index to add to the udp encap
* @param src_ip source address of the tunnel
* @param dst_ip destination address of the tunnel
* @param src_port source port
* @param src_port destination port
* @param flags flags for the udp encap
*
* @return return the id of the tunnel
*/
u32 udp_tunnel_add (fib_protocol_t proto, index_t fib_index,
const ip46_address_t *src_ip, const ip46_address_t *dst_ip,
u16 src_port, u16 dst_port, udp_encap_fixup_flags_t flags);
/**
* @brief Retrieve the index of a udp tunnel (same id of the udp encap)
*
* @param src_ip source address of the tunnel
* @param dst_ip destination address of the tunnel
* @param src_port source port
* @param src_port destination port
*
* @return id of the udp tunnel/encap
*/
u32 udp_tunnel_get (const ip46_address_t *src_ip, const ip46_address_t *dst_ip,
u16 src_port, u16 dst_port);
/**
* @brief Delete a udp tunnel
*
* @param proto FIB_PROTOCOL_IP4 or FIB_PROTOCOL_IP6
* @param fib_index fib index to add to the udp encap
* @param src_ip source address of the tunnel
* @param dst_ip destination address of the tunnel
* @param src_port source port
* @param src_port destination port
* @param flags flags for the udp encap
*
* @return HICN_ERROR_UDP_TUNNEL_NOT_FOUND if the tunnel was not found
* or HICN_ERROR_NONE if the tunnel has been deleted
*/
int udp_tunnel_del (fib_protocol_t proto, index_t fib_index,
const ip46_address_t *src_ip, const ip46_address_t *dst_ip,
u16 src_port, u16 dst_port, udp_encap_fixup_flags_t flags);
/**
* @brief Add a udp tunnel from an existing udp encap
*
* @param uei index of the udp encap object
* @param proto DPO_PROTO_IP6 or DPO_PROTO_IP4
*/
void udp_tunnel_add_existing (index_t uei, dpo_proto_t proto);
/**
* @brief Init the udp tunnel module
*
*/
void udp_tunnel_init ();
#endif
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