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#ifndef _IPREASM_H
#define _IPREASM_H
#include <stdbool.h>
#include <pcap.h>
/*
* This is an abstract time stamp. ipreasm doesn't care whether it is
* in seconds, milliseconds, or nanodecades. All it does it add the
* configured timeout value to it, and then compare it to the timstamps
* of subsequent packets to decide whether a fragment has expired.
*/
typedef uint64_t reasm_time_t;
struct reasm_ip;
/*
* Functions to create and destroy the reassembly environment.
*/
struct reasm_ip *reasm_ip_new (void);
void reasm_ip_free (struct reasm_ip *reasm);
/*
* This is the main packet processing function. It inputs one packet,
* and MAY output one packet in turn. If the input was not a fragment,
* it is passed unmodified. If the input was a fragment that completed
* reassembly of a packet, the reassembled packet is output.
* If more fragments are required for reassembly, or the input packet
* is invalid for some reason, a NULL pointer is returned.
*
* The input must be a pointer allocated by malloc(). The output will
* be a pointer allocated by malloc().
*
* Note that in the case of an IPv6 fragment, the input buffer will be
* modified in-place. This is considered a bug and should be fixed in
* the future.
*/
unsigned char *reasm_ip_next (struct reasm_ip *reasm, unsigned char *packet, unsigned len, reasm_time_t timestamp, unsigned *output_len);
/*
* Set the timeout after which a noncompleted reassembly expires, in
* abstract time units (see above for the definition of reasm_time_t).
*/
bool reasm_ip_set_timeout (struct reasm_ip *reasm, reasm_time_t timeout);
/*
* Query certain information about the current state.
*/
unsigned reasm_ip_waiting (const struct reasm_ip *reasm);
unsigned reasm_ip_max_waiting (const struct reasm_ip *reasm);
unsigned reasm_ip_timed_out (const struct reasm_ip *reasm);
unsigned reasm_ip_dropped_frags (const struct reasm_ip *reasm);
#endif /* _IPREASM_H */
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