Subversion Repositories HelenOS

Rev

Rev 4704 | Rev 4721 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
4505 mejdrech 1
/*
2
 * Copyright (c) 2009 Lukas Mejdrech
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
/** @addtogroup ip
30
 *  @{
31
 */
32
 
4704 mejdrech 33
/** @file
34
 *  IP client interface implementation.
35
 *  @see ip_client.h
4505 mejdrech 36
 */
37
 
38
#include <errno.h>
39
 
40
#include <sys/types.h>
41
 
42
#include "../../include/ip_client.h"
43
 
44
#include "../../structures/packet/packet.h"
45
#include "../../structures/packet/packet_client.h"
46
 
47
#include "ip_header.h"
48
 
4558 mejdrech 49
int ip_client_prepare_packet( packet_t packet, ip_protocol_t protocol, ip_ttl_t ttl, ip_tos_t tos, int dont_fragment, size_t ipopt_length ){
4505 mejdrech 50
    ip_header_ref   header;
51
    uint8_t *       data;
4558 mejdrech 52
    size_t          padding;
4505 mejdrech 53
 
54
    padding =  ipopt_length % 4;
55
    if( padding ){
56
        padding = 4 - padding;
57
        ipopt_length += padding;
58
    }
59
    data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding );
60
    if( ! data ) return ENOMEM;
61
    while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP;
62
    header = ( ip_header_ref ) data;
4558 mejdrech 63
    header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4;
64
    header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL;
4505 mejdrech 65
    header->tos = tos;
66
    header->protocol = protocol;
67
    if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT;
68
    return EOK;
69
}
70
 
4589 mejdrech 71
int ip_client_process_packet( packet_t packet, ip_protocol_t * protocol, ip_ttl_t * ttl, ip_tos_t * tos, int * dont_fragment, size_t * ipopt_length ){
72
    ip_header_ref   header;
73
 
74
    header = ( ip_header_ref ) packet_get_data( packet );
75
    if( ! header ) return ENOMEM;
76
    if( protocol ) * protocol = header->protocol;
77
    if( ttl ) * ttl = header->ttl;
78
    if( tos ) * tos = header->tos;
79
    if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT;
80
    if( ipopt_length ){
81
        * ipopt_length = header->ihl * 4 - sizeof( ip_header_t );
4707 mejdrech 82
        return sizeof( ip_header_t );
4589 mejdrech 83
    }else{
4707 mejdrech 84
        return header->ihl * 4;
4589 mejdrech 85
    }
86
}
87
 
4707 mejdrech 88
int ip_client_header_length( packet_t packet ){
89
    ip_header_ref   header;
90
 
91
    header = ( ip_header_ref ) packet_get_data( packet );
92
    if( ! header ) return ENOMEM;
93
    return header->ihl * 4;
94
}
95
 
4505 mejdrech 96
/** @}
97
 */