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-- Copyright (c) 2018-2021, OARC, Inc.
-- All rights reserved.
--
-- This file is part of dnsjit.
--
-- dnsjit 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.
--
-- dnsjit 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.
--
-- You should have received a copy of the GNU General Public License
-- along with dnsjit. If not, see <http://www.gnu.org/licenses/>.
-- dnsjit.core.object.gre
-- Generic Routing Encapsulation (GRE) part of a packet
--
-- The GRE part of a packet that usually can be found in the object chain
-- after parsing with, for example, Layer filter.
-- See RFC 1701.
-- .SS Attributes
-- .TP
-- gre_flags
-- The GRE flags.
-- .TP
-- ether_type
-- The protocol type of the payload packet.
-- .TP
-- checksum
-- The checksum of the GRE header and the payload packet.
-- .TP
-- key
-- The Key field contains a four octet number which was inserted by
-- the encapsulator.
-- .TP
-- sequence
-- The Sequence Number field contains an unsigned 32 bit integer which is
-- inserted by the encapsulator.
module(...,package.seeall)
require("dnsjit.core.object.gre_h")
local ffi = require("ffi")
local C = ffi.C
local t_name = "core_object_gre_t"
local core_object_gre_t
local Gre = {}
-- Return the textual type of the object.
function Gre:type()
return "gre"
end
-- Return the previous object.
function Gre:prev()
return self.obj_prev
end
-- Cast the object to the underlining object module and return it.
function Gre:cast()
return self
end
-- Cast the object to the generic object module and return it.
function Gre:uncast()
return ffi.cast("core_object_t*", self)
end
-- Make a copy of the object and return it.
function Gre:copy()
return C.core_object_gre_copy(self)
end
-- Free the object, should only be used on copies or otherwise allocated.
function Gre:free()
C.core_object_gre_free(self)
end
core_object_gre_t = ffi.metatype(t_name, { __index = Gre })
-- dnsjit.core.object (3),
-- dnsjit.filter.layer (3)
return Gre
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