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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 | /** @file |
33 | /** @file |
34 | * IP client interface implementation. |
34 | * IP client interface implementation. |
35 | * @see ip_client.h |
35 | * @see ip_client.h |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include <errno.h> |
38 | #include <errno.h> |
39 | 39 | ||
40 | #include <sys/types.h> |
40 | #include <sys/types.h> |
41 | 41 | ||
42 | #include "../../include/ip_client.h" |
42 | #include "../../include/ip_client.h" |
43 | 43 | ||
44 | #include "../../structures/packet/packet.h" |
44 | #include "../../structures/packet/packet.h" |
45 | #include "../../structures/packet/packet_client.h" |
45 | #include "../../structures/packet/packet_client.h" |
46 | 46 | ||
47 | #include "ip_header.h" |
47 | #include "ip_header.h" |
48 | 48 | ||
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 ){ |
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 ){ |
50 | ip_header_ref header; |
50 | ip_header_ref header; |
51 | uint8_t * data; |
51 | uint8_t * data; |
52 | size_t padding; |
52 | size_t padding; |
53 | 53 | ||
54 | padding = ipopt_length % 4; |
54 | padding = ipopt_length % 4; |
55 | if( padding ){ |
55 | if( padding ){ |
56 | padding = 4 - padding; |
56 | padding = 4 - padding; |
57 | ipopt_length += padding; |
57 | ipopt_length += padding; |
58 | } |
58 | } |
59 | data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding ); |
59 | data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding ); |
60 | if( ! data ) return ENOMEM; |
60 | if( ! data ) return ENOMEM; |
61 | while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP; |
61 | while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP; |
62 | header = ( ip_header_ref ) data; |
62 | header = ( ip_header_ref ) data; |
63 | header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4; |
63 | header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4; |
64 | header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL; |
64 | header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL; |
65 | header->tos = tos; |
65 | header->tos = tos; |
66 | header->protocol = protocol; |
66 | header->protocol = protocol; |
67 | if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT; |
67 | if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT; |
68 | return EOK; |
68 | return EOK; |
69 | } |
69 | } |
70 | 70 | ||
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 ){ |
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; |
72 | ip_header_ref header; |
73 | 73 | ||
74 | header = ( ip_header_ref ) packet_get_data( packet ); |
74 | header = ( ip_header_ref ) packet_get_data( packet ); |
75 | if( ! header ) return ENOMEM; |
75 | if( ! header ) return ENOMEM; |
76 | if( protocol ) * protocol = header->protocol; |
76 | if( protocol ) * protocol = header->protocol; |
77 | if( ttl ) * ttl = header->ttl; |
77 | if( ttl ) * ttl = header->ttl; |
78 | if( tos ) * tos = header->tos; |
78 | if( tos ) * tos = header->tos; |
79 | if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT; |
79 | if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT; |
80 | if( ipopt_length ){ |
80 | if( ipopt_length ){ |
81 | * ipopt_length = header->ihl * 4 - sizeof( ip_header_t ); |
81 | * ipopt_length = header->ihl * 4 - sizeof( ip_header_t ); |
82 | return packet_trim( packet, sizeof( ip_header_t ), 0 ); |
82 | return sizeof( ip_header_t ); |
83 | }else{ |
83 | }else{ |
84 | return packet_trim( packet, header->ihl * 4, 0 ); |
84 | return header->ihl * 4; |
85 | } |
85 | } |
86 | } |
86 | } |
- | 87 | ||
- | 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 | } |
|
87 | 95 | ||
88 | /** @} |
96 | /** @} |
89 | */ |
97 | */ |
90 | 98 |