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Merge relicensing change from dev

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Adam Ierymenko 2019-08-23 09:27:13 -07:00
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122 changed files with 1513 additions and 3318 deletions
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41
osdep/MacEthernetTapAgent.c
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@ -1,28 +1,15 @@
/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.com/
* Copyright (c)2019 ZeroTier, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file in the project's root directory.
*
* 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 General Public License for more details.
* Change Date: 2023-01-01
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2.0 of the Apache License.
*/
/****/
/*
* This creates a pair of feth devices with the lower numbered device
@ -30,10 +17,10 @@
* used to actually read and write packets. The latter gets no IP config
* and is only used for I/O. The behavior of feth is similar to the
* veth pairs that exist on Linux.
*
*
* The feth device has only existed since MacOS Sierra, but that's fairly
* long ago in Mac terms.
*
*
* I/O with feth must be done using two different sockets. The BPF socket
* is used to receive packets, while an AF_NDRV (low-level network driver
* access) socket must be used to inject. AF_NDRV can't read IP frames
@ -41,20 +28,20 @@
* been handled, and while BPF can inject its MTU for injected packets
* is limited to 2048. AF_NDRV packet injection is required to inject
* ZeroTier's large MTU frames.
*
*
* Benchmarks show that this performs similarly to the old tap.kext driver,
* and a kext is no longer required. Splitting it off into an agent will
* also make it easier to have zerotier-one itself drop permissions.
*
*
* All this stuff is basically undocumented. A lot of tracing through
* the Darwin/XNU kernel source was required to figure out how to make
* this actually work.
*
*
* See also:
*
*
* https://apple.stackexchange.com/questions/337715/fake-ethernet-interfaces-feth-if-fake-anyone-ever-seen-this
* https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/net/if_fake.c.auto.html
*
*
*/
#include <stdio.h>