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Kyle Evans 251a32b5b2 tun/tap: merge and rename to tuntap
tun(4) and tap(4) share the same general management interface and have a lot
in common. Bugs exist in tap(4) that have been fixed in tun(4), and
vice-versa. Let's reduce the maintenance requirements by merging them
together and using flags to differentiate between the three interface types
(tun, tap, vmnet).

This fixes a couple of tap(4)/vmnet(4) issues right out of the gate:
- tap devices may no longer be destroyed while they're open [0]
- VIMAGE issues already addressed in tun by kp

[0] emaste had removed an easy-panic-button in r240938 due to devdrn
blocking. A naive glance over this leads me to believe that this isn't quite
complete -- destroy_devl will only block while executing d_* functions, but
doesn't block the device from being destroyed while a process has it open.
The latter is the intent of the condvar in tun, so this is "fixed" (for
certain definitions of the word -- it wasn't really broken in tap, it just
wasn't quite ideal).

ifconfig(8) also grew the ability to map an interface name to a kld, so
that `ifconfig {tun,tap}0` can continue to autoload the correct module, and
`ifconfig vmnet0 create` will now autoload the correct module. This is a
low overhead addition.

(MFC commentary)

This may get MFC'd if many bugs in tun(4)/tap(4) are discovered after this,
and how critical they are. Changes after this are likely easily MFC'd
without taking this merge, but the merge will be easier.

I have no plans to do this MFC as of now.

Reviewed by:	bcr (manpages), tuexen (testing, syzkaller/packetdrill)
Input also from:	melifaro
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D20044
2019-05-08 02:32:11 +00:00
bin Restore the -n flag parsing, but ignore it. 2019-04-24 05:24:10 +00:00
cddl Fix dataset name comparison in zfs_compare(). 2019-05-08 01:35:43 +00:00
contrib Import libxo-1.0.4: 2019-05-06 20:20:21 +00:00
crypto Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
etc mtree: Add more runtime package tag 2019-04-25 16:45:24 +00:00
gnu Fix gdb/kgdb build under WITH_PIE 2019-04-01 19:19:51 +00:00
include Introduce funlinkat syscall that always us to check if we are removing 2019-04-06 09:34:26 +00:00
kerberos5 Add WITH_PIE knob to build Position Independent Executables 2019-02-15 22:22:38 +00:00
lib Fix libsbuf sbuf_printf_drain symbol version 2019-05-07 21:15:11 +00:00
libexec Add ipsec.ko to required_modules for rc.d/ipsec script. 2019-05-06 08:30:53 +00:00
release Increase the default size of the GCE disk image from 3GB to 20GB, 2019-05-03 17:23:08 +00:00
rescue rescue: set NO_SHARED in Makefile 2018-11-19 22:18:18 +00:00
sbin tun/tap: merge and rename to tuntap 2019-05-08 02:32:11 +00:00
secure Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
share tun/tap: merge and rename to tuntap 2019-05-08 02:32:11 +00:00
stand command_bcache() does not use argv 2019-05-07 10:01:45 +00:00
sys tun/tap: merge and rename to tuntap 2019-05-08 02:32:11 +00:00
targets retire LINKER_FEATURES filter flag 2018-11-12 20:44:22 +00:00
tests Import libxo 1.0.4 2019-05-06 20:15:00 +00:00
tools revert QEMU q35 platform use from r346748 2019-04-30 15:28:52 +00:00
usr.bin Import libxo-1.0.4: 2019-05-06 20:20:21 +00:00
usr.sbin Fix clang -Wcast-qual issues 2019-05-04 02:09:30 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml Cirrus-CI: pass OVMF env var to test script for upcoming changes 2019-04-11 13:01:26 +00:00
.gitattributes MK_ZFS -> {MK_ZFS|MK_LOADER_ZFS}, this is so we can diable userland / kernel 2019-01-05 22:45:20 +00:00
.gitignore Ignore _.universe-toolchain file. 2018-07-01 13:50:37 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Update/reformat maintainer entries that I am a part of 2019-04-29 18:48:43 +00:00
Makefile Fix a typo when sanity checking in the bootstrap-tools target 2019-04-09 16:17:31 +00:00
Makefile.inc1 pkgbase: Use uname as ABI_FILE 2019-03-27 17:55:39 +00:00
Makefile.libcompat Use ...-freebsd13.0 in -target strings. 2018-11-12 16:55:20 +00:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc Set tentative merge date, and bump __FreeBSD_version. 2019-03-04 19:23:11 +00:00
README README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
UPDATING tun/tap: merge and rename to tuntap 2019-05-08 02:32:11 +00:00

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