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nfqws: apply seqovl only to the first multisplit part to prevent server races

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bol-van 2024-11-12 18:35:14 +03:00
parent 08238664cd
commit 28797184e4
1 changed files with 4 additions and 1 deletions
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5
nfq/desync.c
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@ -1280,7 +1280,10 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
{ {
to = i==multisplit_count ? dis->len_payload : multisplit_pos[i]; to = i==multisplit_count ? dis->len_payload : multisplit_pos[i];
seqovl = dp->desync_seqovl; // do seqovl only to the first packet
// otherwise it's prone to race condition on server side
// what happens first : server pushes socket buffer to process or another packet with seqovl arrives
seqovl = i==0 ? dp->desync_seqovl : 0;
#ifdef __linux__ #ifdef __linux__
// only linux return error if MTU is exceeded // only linux return error if MTU is exceeded
for(;;seqovl=0) for(;;seqovl=0)