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wireshark/in_cksum.h

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Add code to check the checksums of TCP segments and UDP datagrams; replace the existing checksummer with a modified version of the BSD checksumming code. Add a flag to the "packet_info" structure to indicate that a packet is the first fragment of a fragmented datagram, so that the checksummers won't try to checksum those. (It doesn't seem to add a lot of CPU overhead, so we don't introduce a flag to disable it, yet. Further checks may be necessary to see whether the overhead is just swamped by other overheads when scanning through a capture dissecting all frames, or if it truly is negligible.) Make the Boolean preference option controlling whether to make the top-level protocol tree item for TCP display a packet summary static to the TCP dissector (it doesn't need to be accessible outside the TCP dissector). svn path=/trunk/; revision=2751
2000-12-13 02:24:23 +00:00
/* in_cksum.h
* Declaration of Internet checksum routine.
*
* $Id: in_cksum.h,v 1.1 2000/12/13 02:24:22 guy Exp $
*/
typedef struct {
const guint8 *ptr;
int len;
} vec_t;
extern int in_cksum(const vec_t *vec, int veclen);
extern guint16 in_cksum_shouldbe(guint16 sum, guint16 computed_sum);