Wiesner András
c165389369
- Dynmem mutex added - IP reassembler fixed - More explanation added in comments to the PacketSieve
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
#ifndef ETHERLIB_IP_ASSEMBLER_H
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#define ETHERLIB_IP_ASSEMBLER_H
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#include <stdint.h>
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#include "../../packet_parsers/ipv4_packet.h"
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typedef struct IPv4Fragment_ {
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uint16_t offset; ///< Address offset of this segment
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uint16_t size; ///< Size of this segment
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struct IPv4Fragment_ * next; ///< Pointer to next segment
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bool8_t lastFrag; ///< It's the last fragment from a packet
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uint8_t payload[]; ///< Fragment payload
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} IPv4Fragment;
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/**
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* Fragment chain descriptor
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*/
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typedef struct FragChainDesc_ {
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IPv4Fragment * fragChain; ///< Fragment chain
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uint32_t alarmID; ///< Alarm ID for reassembly timeout
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uint16_t id; ///< IP packet identification
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uint16_t fullSize; ///< Reassembled IP packet size
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struct FragChainDesc_ * next; ///< Next fragment chain
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} FragChainDesc;
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typedef struct {
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FragChainDesc * chains; ///< Linked list of fragment chains
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struct EthInterface_ * intf; ///< Interface instantiated this reassembler
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} IPv4Assembler;
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/**
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* Create new IPv4 packet reassembler.
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* @return pointer to newly allocated assembler
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*/
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IPv4Assembler * ipra_new(struct EthInterface_ * intf);
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/**
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* Input packet packet fragment.
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* @param ipra pointer to IP reassembler
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* @param ipProps pointer to IP properties structure
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*/
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void ipra_input(IPv4Assembler * ipra, const IPv4Props * ipProps, const uint8_t * payload, uint32_t size);
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/**
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* Attempt to reassemble a packet.
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* @param ipra pointer to IPv4 reassembly object
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* @param id packet sequence identification
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* @param payload pointer to uint8_t* pointer; filled only on successful reassembly
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* @param size pointer to uint16_t field; filled only on successful reassembly
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* @return reassembly was successful
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*/
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bool ipra_try_reassemble(IPv4Assembler *ipra, uint16_t id, uint8_t **payload, uint16_t *size, PcktHeaderElement *pcktHdrLe);
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#endif //ETHERLIB_IP_ASSEMBLER_H
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