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Fragman preserves packet header

This commit is contained in:
7u83 2022-09-04 21:40:08 +02:00
parent 059c0e542e
commit cc257ed27f
2 changed files with 28 additions and 54 deletions
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56
src/cw/fragman.c
View File

@ -54,6 +54,7 @@
#include "capwap.h"
#include "cw.h"
#include "fragman.h"
/**
@ -101,20 +102,6 @@ static struct frag * frag_new(struct frag * frags, int fragid)
return NULL;
}
/*
void fragman_free(frag_t * frags,struct frag * f)
{
int i;
for (i=0; i<FRAG_MAXIDS; i++){
if (frags[i]->fragid==f->fragid){
frags[i]=NULL;
break;
}
}
free(f);
}
*/
/**
* Add a fragment
* @pram frags Fragman object
@ -129,12 +116,10 @@ uint8_t * fragman_add(frag_t * frags, uint8_t *packet, int hlen, int payloadlen)
uint32_t val0,val1;
int fragid,fragoffset;
int dst;
int ti;
/* read the transport header dword 0,
* contains hlen*/
val0 = ntohl(*((uint32_t*)packet));
/* int hlen = (val0 >> 19) & 0x1f;*/
/* read the transport header dword 1,
* contains fragid and fragoffset */
@ -142,33 +127,30 @@ uint8_t * fragman_add(frag_t * frags, uint8_t *packet, int hlen, int payloadlen)
fragid = val1>>16;
fragoffset=(val1 >>3) & 0x1fff;
/*// printf("Fragid = %i, offset = %i\n",fragid,fragoffset);*/
/* determine size of payload */
/* int payloadlen = len - hlen*4;
if (payloadlen<0){
errno = EINVAL;
return NULL;
}
*/
/* find / create cfragment */
f = frag_get(frags,fragid);
if (!f){
f = frag_new(frags,fragid);
if (!f){
errno = ENOMEM;
/* out of fragmentation space */
return NULL;
}
}
if (!f){
errno = ENOMEM;
/* out of fragmentation space */
return NULL;
}
errno = 0;
dst = fragoffset*8;
/* copy fragment*/
if (dst + payloadlen < FRAG_MAXSIZE) {
memcpy( f->buffer+4+dst,packet+hlen,payloadlen);
if (fragoffset==0){
/* preserve header of 1st fragment */
memset(f->buffer,0,MAX_PKT_HDR_LEN);
memcpy(f->buffer,packet,hlen);
cw_set_hdr_hlen(f->buffer,MAX_PKT_HDR_LEN/4);
cw_set_hdr_flags(f->buffer, CAPWAP_FLAG_HDR_F, 0);
}
memcpy( f->buffer+MAX_PKT_HDR_LEN+4+dst,packet+hlen,payloadlen);
f->bytesreceived+=payloadlen;
}
@ -176,22 +158,14 @@ uint8_t * fragman_add(frag_t * frags, uint8_t *packet, int hlen, int payloadlen)
f->bytesneeded=dst+payloadlen;
}
for (ti=0; ti<16; ti++){
/*// printf("%02X ",(f->buffer+4)[ti]);*/
}
if (f->bytesneeded>0 && f->bytesneeded<=f->bytesreceived){
uint8_t * r=f->buffer;
f->buffer=0;
/*// printf("last bytes need %i\n",f->bytesneeded);*/
*((uint32_t*)(r))=f->bytesneeded;
*((uint32_t*)(r+MAX_PKT_HDR_LEN))=f->bytesneeded;
return r;
}
/*// printf("Fragman bytes needed: %i, received %i\n",f->bytesneeded,f->bytesreceived);*/
return NULL;
}

26
src/cw/fragman.h
View File

@ -19,9 +19,9 @@
/**
*@defgroup Fragman FRAGMAN
*@breif Frgaman functions
*@brief Frgaman functions
*
* Detailed esription
* Detailed desription
*@{
*/
@ -33,18 +33,18 @@
#include <time.h>
#include <unistd.h>
#ifndef FRAG_MAXSIZE
/** maximaum size of a fragment */
#define FRAG_MAXSIZE (65536+4)
#endif
#ifndef FRAG_MAXIDS
#define FRAG_MAXIDS 10
#endif
#define MAX_PKT_HDR_LEN 64
#ifndef FRAG_TTL
#define FRAG_TTL 5
#endif
/** maximaum size of a fragment */
#define FRAG_MAXSIZE (65536+MAX_PKT_HDR_LEN)
#define FRAG_MAXIDS 10
/**
* TTL of received fragment in seconds
*/
#define FRAG_TTL 5
struct frag {
@ -57,7 +57,7 @@ struct frag {
int bytesreceived;
int bytesneeded;
struct timespec t;
uint8_t * header;
// uint8_t * header;
};
typedef struct frag frag_t; /*FRAGMAN;*/