Rev 4707 | Rev 4722 | 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 |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup ip |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 4704 | mejdrech | 33 | /** @file |
| 34 | * IP client interface implementation. |
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| 35 | * @see ip_client.h |
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| 4505 | mejdrech | 36 | */ |
| 37 | |||
| 38 | #include <errno.h> |
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| 39 | |||
| 40 | #include <sys/types.h> |
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| 41 | |||
| 42 | #include "../../include/ip_client.h" |
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| 43 | |||
| 44 | #include "../../structures/packet/packet.h" |
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| 45 | #include "../../structures/packet/packet_client.h" |
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| 46 | |||
| 47 | #include "ip_header.h" |
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| 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; |
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| 4558 | mejdrech | 52 | size_t padding; |
| 4505 | mejdrech | 53 | |
| 54 | padding = ipopt_length % 4; |
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| 55 | if( padding ){ |
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| 56 | padding = 4 - padding; |
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| 57 | ipopt_length += padding; |
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| 58 | } |
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| 59 | data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding ); |
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| 60 | if( ! data ) return ENOMEM; |
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| 61 | while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP; |
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| 62 | header = ( ip_header_ref ) data; |
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| 4558 | mejdrech | 63 | header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4; |
| 64 | header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL; |
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| 4505 | mejdrech | 65 | header->tos = tos; |
| 66 | header->protocol = protocol; |
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| 67 | if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT; |
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| 68 | return EOK; |
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| 69 | } |
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| 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; |
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| 73 | |||
| 74 | header = ( ip_header_ref ) packet_get_data( packet ); |
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| 4721 | mejdrech | 75 | if(( ! header ) |
| 76 | || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){ |
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| 77 | return ENOMEM; |
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| 78 | } |
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| 4589 | mejdrech | 79 | if( protocol ) * protocol = header->protocol; |
| 80 | if( ttl ) * ttl = header->ttl; |
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| 81 | if( tos ) * tos = header->tos; |
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| 82 | if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT; |
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| 83 | if( ipopt_length ){ |
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| 84 | * ipopt_length = header->ihl * 4 - sizeof( ip_header_t ); |
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| 4707 | mejdrech | 85 | return sizeof( ip_header_t ); |
| 4589 | mejdrech | 86 | }else{ |
| 4707 | mejdrech | 87 | return header->ihl * 4; |
| 4589 | mejdrech | 88 | } |
| 89 | } |
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| 90 | |||
| 4721 | mejdrech | 91 | size_t ip_client_header_length( packet_t packet ){ |
| 4707 | mejdrech | 92 | ip_header_ref header; |
| 93 | |||
| 94 | header = ( ip_header_ref ) packet_get_data( packet ); |
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| 4721 | mejdrech | 95 | if(( ! header ) |
| 96 | || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){ |
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| 97 | return 0; |
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| 98 | } |
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| 99 | return header->ihl * 4u; |
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| 4707 | mejdrech | 100 | } |
| 101 | |||
| 4505 | mejdrech | 102 | /** @} |
| 103 | */ |