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/* IP encapsulation, for libreswan
*
* Copyright (C) 2020 Andrew Cagney
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/lgpl-2.1.txt>.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
* License for more details.
*
*/
/*
* Should the the ESP/AH packet be encapsulated using some other
* transport? For UDP this is called NAT. For TCP this is called
* IKETCP.
*
* XXX: Confusingly mode (TUNNEL, TRANSPORT) is also (understandably)
* referred to as encapsulation :-(
*/
#ifndef IP_ENCAP_H
#define IP_ENCAP_H
struct ip_encap {
const char *name;
const struct ip_protocol *outer;
const struct ip_protocol *inner;
/*
* Passed into the kernel to flag that this transform is
* encapsulated.
*
* TCP Encap of IKE and IPsec Packets
* https://tools.ietf.org/html/rfc8229
*/
unsigned encap_type;
};
extern const struct ip_encap ip_encap_esp_in_tcp;
extern const struct ip_encap ip_encap_esp_in_udp;
#define PRI_IP_ENCAP "%u(%s)"
#define pri_ip_encap(E) (E) == NULL ? 0 : (E)->encap_type, (E) == NULL ? "none" : (E)->name
#endif
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