Change the behaviour of tun(4) on close.
- if the interface was auto-created by opening a /dev/tun* device it will
auto-destroy on close. This is comparable to ifconfig tun0 destroy and
will r

Change the behaviour of tun(4) on close.
- if the interface was auto-created by opening a /dev/tun* device it will
auto-destroy on close. This is comparable to ifconfig tun0 destroy and
will remove all routes and addresses associated with the interface.
- if the interface was created by ifconfig(8) or hostname.if(5) the interface
is persistent -- it is just marked as not running. Especially routes are no
longer removed when the interface is closed. This is useful for static
setups like the server side of a ssh vpn or static qemu session.
This behaviour is more logic then the half done cleanup that is currently done.
OK mpf@

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if_tun.c also has this comment so remove duplicate; ok jmc@ krw@

Add tap aka layer 2 tunneling support to tun(4). It can be enabled by setting
the link0 flag via ifconfig(8). OK markus@, canacar@ also tested by ish@

renumber the get/set debug ioctls for they conflict w/ ppp, we do not keep the O versions since these are debugging only and should not affect normal functionality; deraadt@ ok

Replace license with something that's actually free.
Approved by original author. Julian.Onions@nexor.co.uk

By popular demand, protect from multiple inclusion, and fix to use the
same naming style.

TUNSIFMODE ioctl (from NetBSD)

#define TUNMRU as 16384 and allow incoming packets
of up to this size rather than restricting them based
on our MTU.

convert DLT_LOOP header to network-order u_int32_t

pass address family as host-byte-order u_int32_t. this fixes bpf. add a
note to the bottom of tun.4 to indicate that this is a binary
incompatibility with older versions, and describe all 3 revision

pass address family as host-byte-order u_int32_t. this fixes bpf. add a
note to the bottom of tun.4 to indicate that this is a binary
incompatibility with older versions, and describe all 3 revisions this
has gone through. everyone -- recompile your code that uses tun.

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indent

drom NetBSD PR#2411:
add bcast support, do if_flags setable, minor cleanup.

partial sync with netbsd 960418, more to come

bug fixes, speedups. multiple AFs support.
bpf fixes.

initial import of NetBSD tree