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1 | /* |
1 | /* |
2 | * Copyright (c) 2009 Lukas Mejdrech |
2 | * Copyright (c) 2009 Lukas Mejdrech |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup ip |
29 | /** @addtogroup ip |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | */ |
35 | */ |
36 | 36 | ||
37 | #include <errno.h> |
37 | #include <errno.h> |
38 | 38 | ||
39 | #include <sys/types.h> |
39 | #include <sys/types.h> |
40 | 40 | ||
41 | #include "../../include/ip_client.h" |
41 | #include "../../include/ip_client.h" |
42 | 42 | ||
43 | #include "../../structures/packet/packet.h" |
43 | #include "../../structures/packet/packet.h" |
44 | #include "../../structures/packet/packet_client.h" |
44 | #include "../../structures/packet/packet_client.h" |
45 | 45 | ||
46 | #include "ip_header.h" |
46 | #include "ip_header.h" |
47 | 47 | ||
48 | 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 ){ |
48 | 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 ){ |
49 | ip_header_ref header; |
49 | ip_header_ref header; |
50 | uint8_t * data; |
50 | uint8_t * data; |
51 | size_t padding; |
51 | size_t padding; |
52 | 52 | ||
53 | padding = ipopt_length % 4; |
53 | padding = ipopt_length % 4; |
54 | if( padding ){ |
54 | if( padding ){ |
55 | padding = 4 - padding; |
55 | padding = 4 - padding; |
56 | ipopt_length += padding; |
56 | ipopt_length += padding; |
57 | } |
57 | } |
58 | data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding ); |
58 | data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding ); |
59 | if( ! data ) return ENOMEM; |
59 | if( ! data ) return ENOMEM; |
60 | while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP; |
60 | while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP; |
61 | header = ( ip_header_ref ) data; |
61 | header = ( ip_header_ref ) data; |
62 | header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4; |
62 | header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4; |
63 | header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL; |
63 | header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL; |
64 | header->tos = tos; |
64 | header->tos = tos; |
65 | header->protocol = protocol; |
65 | header->protocol = protocol; |
66 | if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT; |
66 | if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT; |
67 | return EOK; |
67 | return EOK; |
68 | } |
68 | } |
69 | 69 | ||
- | 70 | 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 ){ |
|
- | 71 | ip_header_ref header; |
|
- | 72 | ||
- | 73 | header = ( ip_header_ref ) packet_get_data( packet ); |
|
- | 74 | if( ! header ) return ENOMEM; |
|
- | 75 | if( protocol ) * protocol = header->protocol; |
|
- | 76 | if( ttl ) * ttl = header->ttl; |
|
- | 77 | if( tos ) * tos = header->tos; |
|
- | 78 | if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT; |
|
- | 79 | if( ipopt_length ){ |
|
- | 80 | * ipopt_length = header->ihl * 4 - sizeof( ip_header_t ); |
|
- | 81 | return packet_trim( packet, sizeof( ip_header_t ), 0 ); |
|
- | 82 | }else{ |
|
- | 83 | return packet_trim( packet, header->ihl * 4, 0 ); |
|
- | 84 | } |
|
- | 85 | } |
|
- | 86 | ||
70 | /** @} |
87 | /** @} |
71 | */ |
88 | */ |
72 | 89 |