mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
6608878d57
Adds mssfix support including optional
transport overhead. Some code has been ported
from openvpn2.
mssfix sets MSS option in TCP SYN to
a calculated value which guarantees that
size of UDP/TCP packet (which may or may not
include headers, see below) encapsulating
TCP segments won't exceed mssfix value.
If mssfix is used with optional "mtu" parameter,
then IP and UDP/TCP headers are also taken into account.
It is set in config like this:
mssfix 1300 mtu
Signed-off-by: Lev Stipakov <lev@openvpn.net>
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Common declarations for IPv4 and IPv6
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#pragma once
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#include <cstdint> // for std::uint32_t, uint16_t, uint8_t
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namespace openvpn {
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namespace IPCommon {
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enum {
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ICMPv4 = 1, /* ICMPv4 protocol */
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ICMPv6 = 58, /* ICMPv6 protocol */
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IGMP = 2, /* IGMP protocol */
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TCP = 6, /* TCP protocol */
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UDP = 17, /* UDP protocol */
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};
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enum {
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IPv4 = 4,
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IPv6 = 6
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};
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inline unsigned int version(const std::uint8_t version_len_prio)
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{
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return (version_len_prio >> 4) & 0x0F;
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}
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}
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}
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