vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
63 lines
1.9 KiB
C++
63 lines
1.9 KiB
C++
/* Copyright (C) 2023 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "NetEnet.h"
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#include "ps/ConfigDB.h"
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#include "ps/containers/Span.h"
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namespace PS
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{
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namespace Enet
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{
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// ENet protocol MTU
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// ENet by default uses 1400 as ENet packet fragment max size, adding ICMP and
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// IPv4 headers this may exceed the MTU for some VPN solutions [1], so provide
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// a lower default.
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// MTU negotiation server-side needs [2], which was merged after enet-1.3.17,
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// so the user configured value may be ignored on older versions.
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// [1] https://github.com/lsalzman/enet/issues/132
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// [2] https://github.com/lsalzman/enet/pull/222
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constexpr enet_uint32 HOST_DEFAULT_MTU = 1372;
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ENetHost* CreateHost(const ENetAddress* address, size_t peerCount, size_t channelLimit)
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{
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// TODO: Maybe allow user to set rate limits?
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ENetHost* host = enet_host_create(address, peerCount, channelLimit, 0, 0);
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if (!host)
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return nullptr;
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// Public ENet API doesn't offer a means to change MTU, so do it in a
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// way least likely to break with ENet updates.
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enet_uint32 mtu = HOST_DEFAULT_MTU;
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CFG_GET_VAL("network.enetmtu", mtu);
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host->mtu = mtu;
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for (ENetPeer& p : PS::span{host->peers, host->peerCount})
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enet_peer_reset(&p);
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return host;
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}
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} // namespace Enet
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} // namespace PS
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