/usr/share/ada/adainclude/anet/anet-ipv4.ads is in libanet0.3.1-dev 0.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Copyright (C) 2011, 2012 secunet Security Networks AG
-- Copyright (C) 2011, 2012 Reto Buerki <reet@codelabs.ch>
-- Copyright (C) 2011, 2012 Adrian-Ken Rueegsegger <ken@codelabs.ch>
--
-- 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 2 of the License, or (at your
-- option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
--
-- 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.
--
-- As a special exception, if other files instantiate generics from this
-- unit, or you link this unit with other files to produce an
-- executable this unit does not by itself cause the resulting
-- executable to be covered by the GNU General Public License. This
-- exception does not however invalidate any other reasons why the
-- executable file might be covered by the GNU Public License.
--
package Anet.IPv4 is
IP_Header_Length : constant := 20;
-- IP Header size in bytes.
function Create_Header
(Payload : Ada.Streams.Stream_Element_Array;
Src_IP : IPv4_Addr_Type;
Dst_IP : IPv4_Addr_Type)
return Ada.Streams.Stream_Element_Array;
-- Returns an IPv4 header for given source, destination IPv4 addresses and
-- payload.
function Create_Packet
(Payload : Ada.Streams.Stream_Element_Array;
Src_IP : IPv4_Addr_Type;
Src_Port : Port_Type;
Dst_IP : IPv4_Addr_Type;
Dst_Port : Port_Type)
return Ada.Streams.Stream_Element_Array;
-- Create an IPv4 packet including an UDP header with specified arguments.
function Validate_And_Strip
(Packet : Ada.Streams.Stream_Element_Array)
return Ada.Streams.Stream_Element_Array;
-- Validate IP packet given as stream element array. The function raises an
-- Invalid_IP_Packet exception if the data is not considered valid.
--
-- The following checks are performed:
-- * Data length must be at least 264 bytes
-- (IP header + UDP header + min. 236 bytes DHCP payload)
-- * IP header length (IHL) must be at least 5
-- * IP version is 4
-- * Total length must match received data length
-- * Protocol is UDP
-- * IP header checksum is correct
-- * UDP header checksum is correct
--
-- If the packet is valid, the IP and UDP headers are stripped and the
-- payload is returned.
Invalid_IP_Packet : exception;
end Anet.IPv4;
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