tunctl

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-define(SIZEOF_INT, 4).
-define(SIZEOF_UNSIGNED_INT, ?SIZEOF_INT).
-define(UINT16(N), N:2 / native - unsigned - integer - unit:8).
-define(UINT32(N), N:4 / native - unsigned - integer - unit:8).

% ifconfig
-define(IFF_UP, 1 bsl 0).
-define(IFF_POINTOPOINT, 1 bsl 5).
-define(IFF_RUNNING, 1 bsl 6).

% Ioctl defines
-define(TUNSETNOCSUM, ?IOW($T, 200, ?SIZEOF_INT)).
-define(TUNSETDEBUG, ?IOW($T, 201, ?SIZEOF_INT)).
-define(TUNSETIFF, ?IOW($T, 202, ?SIZEOF_INT)).
-define(TUNSETPERSIST, ?IOW($T, 203, ?SIZEOF_INT)).
-define(TUNSETOWNER, ?IOW($T, 204, ?SIZEOF_INT)).
-define(TUNSETLINK, ?IOW($T, 205, ?SIZEOF_INT)).
-define(TUNSETGROUP, ?IOW($T, 206, ?SIZEOF_INT)).
-define(TUNGETFEATURES, ?IOR($T, 207, ?SIZEOF_UNSIGNED_INT)).
-define(TUNSETOFFLOAD, ?IOW($T, 208, ?SIZEOF_UNSIGNED_INT)).
-define(TUNSETTXFILTER, ?IOW($T, 209, ?SIZEOF_UNSIGNED_INT)).
-define(TUNGETIFF, ?IOR($T, 210, ?SIZEOF_UNSIGNED_INT)).
-define(TUNGETSNDBUF, ?IOR($T, 211, ?SIZEOF_INT)).
-define(TUNSETSNDBUF, ?IOW($T, 212, ?SIZEOF_INT)).

% TUNSETIFF ifr flags
-define(IFF_TUN, 16#0001).
-define(IFF_TAP, 16#0002).
-define(IFF_MULTI_QUEUE, 16#0100).
-define(IFF_NO_PI, 16#1000).
-define(IFF_ONE_QUEUE, 16#2000).
-define(IFF_VNET_HDR, 16#4000).
-define(IFF_TUN_EXCL, 16#8000).

-record(tun_pi, {
    % 2/native-unsigned-integer-unit:8
    flags,
    % 2/native-unsigned-integer-unit:8
    proto
}).

-define(TUN_FLT_ALLMULTI, 16#0001).

-record(tun_filter, {
    % TUN_FLT_ flags: 2/native-unsigned-integer-unit:8
    flags,
    % 2/native-unsigned-integer-unit:8
    count,
    addr
}).