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nfqws: define reasm buffer sizes

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bol-van 2025-03-24 09:34:37 +03:00
parent 66fda2c33d
commit 14b3dd459b
1 changed files with 7 additions and 4 deletions

11
nfq/desync.c

@ -66,6 +66,9 @@ const uint8_t fake_tls_clienthello_default[648] = {
#define PKTDATA_MAXDUMP 32
#define IP_MAXDUMP 80
#define TCP_MAX_REASM 16384
#define UDP_MAX_REASM 16384
bool desync_valid_zero_stage(enum dpi_desync_mode mode)
{
return mode==DESYNC_SYNACK || mode==DESYNC_SYNDATA;
@ -954,7 +957,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
!(ctrack->req_seq_finalized && seq_within(ctrack->seq_last, ctrack->req_seq_start, ctrack->req_seq_end)))
{
// do not reconstruct unexpected large payload (they are feeding garbage ?)
if (!reasm_orig_start(ctrack,IPPROTO_TCP,TLSRecordLen(dis->data_payload),16384,dis->data_payload,dis->len_payload))
if (!reasm_orig_start(ctrack,IPPROTO_TCP,TLSRecordLen(dis->data_payload),TCP_MAX_REASM,dis->data_payload,dis->len_payload))
{
reasm_orig_cancel(ctrack);
return verdict;
@ -1953,7 +1956,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
return verdict; // cannot be first packet
}
}
uint8_t defrag[16384];
uint8_t defrag[UDP_MAX_REASM];
size_t hello_offset, hello_len, defrag_len = sizeof(defrag);
bool bFull;
if (QUICDefragCrypto(pclean,clean_len,defrag,&defrag_len,&bFull))
@ -1970,7 +1973,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
if (bIsHello && !bReqFull && ReasmIsEmpty(&ctrack->reasm_orig))
{
// preallocate max buffer to avoid reallocs that cause memory copy
if (!reasm_orig_start(ctrack,IPPROTO_UDP,16384,16384,clean,clean_len))
if (!reasm_orig_start(ctrack,IPPROTO_UDP,UDP_MAX_REASM,UDP_MAX_REASM,clean,clean_len))
{
reasm_orig_cancel(ctrack);
return verdict;
@ -2021,7 +2024,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
if (ReasmIsEmpty(&ctrack->reasm_orig))
{
// preallocate max buffer to avoid reallocs that cause memory copy
if (!reasm_orig_start(ctrack,IPPROTO_UDP,16384,16384,clean,clean_len))
if (!reasm_orig_start(ctrack,IPPROTO_UDP,UDP_MAX_REASM,UDP_MAX_REASM,clean,clean_len))
{
reasm_orig_cancel(ctrack);
return verdict;