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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// Method to generate a Frame object for typical OpenVPN usage
#ifndef OPENVPN_FRAME_FRAME_INIT_H
#define OPENVPN_FRAME_FRAME_INIT_H
#include <algorithm>
#include <openvpn/frame/frame.hpp>
namespace openvpn {
inline Frame::Ptr frame_init(const bool align_adjust_3_1,
const size_t tun_mtu_max,
const size_t control_channel_payload,
const bool verbose)
{
const size_t payload = std::max(tun_mtu_max + 512, size_t(2048));
const size_t headroom = 512;
const size_t tailroom = 512;
const size_t align_block = 16;
const unsigned int buffer_flags = 0;
Frame::Ptr frame(new Frame(Frame::Context(headroom, payload, tailroom, 0, align_block, buffer_flags)));
if (align_adjust_3_1)
{
(*frame)[Frame::READ_LINK_TCP] = Frame::Context(headroom, payload, tailroom, 3, align_block, buffer_flags);
(*frame)[Frame::READ_LINK_UDP] = Frame::Context(headroom, payload, tailroom, 1, align_block, buffer_flags);
}
(*frame)[Frame::READ_BIO_MEMQ_STREAM] = Frame::Context(headroom,
std::min(control_channel_payload, payload),
tailroom,
0,
align_block,
buffer_flags);
(*frame)[Frame::WRITE_SSL_CLEARTEXT] = Frame::Context(headroom,
payload,
tailroom,
0,
align_block,
BufferAllocated::GROW);
frame->standardize_capacity(~0);
if (verbose)
OPENVPN_LOG("Frame=" << headroom << '/' << payload << '/' << tailroom
<< " mssfix-ctrl=" << (*frame)[Frame::READ_BIO_MEMQ_STREAM].payload());
return frame;
}
inline Frame::Context frame_init_context_simple(const size_t payload)
{
const size_t headroom = 512;
const size_t tailroom = 512;
const size_t align_block = 16;
const unsigned int buffer_flags = 0;
return Frame::Context(headroom, payload, tailroom, 0, align_block, buffer_flags);
}
inline Frame::Ptr frame_init_simple(const size_t payload)
{
Frame::Ptr frame = new Frame(frame_init_context_simple(payload));
frame->standardize_capacity(~0);
return frame;
}
} // namespace openvpn
#endif // OPENVPN_FRAME_FRAME_INIT_H
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