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nfqws: --synack-split select syn or ack first

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bol-van
2025-05-09 20:20:55 +03:00
parent 8a1d7c7abd
commit 2a23bc99f6
4 changed files with 35 additions and 11 deletions
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26
nfq/desync.c
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@@ -1285,10 +1285,6 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
dis->tcp->th_flags &= ~TH_ACK;
tcp_fix_checksum(dis->tcp,dis->transport_len, dis->ip, dis->ip6);
DLOG("sending split SYNACK : SYN\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , dis->data_pkt, dis->len_pkt))
goto send_orig;
pkt1_len = sizeof(pkt1);
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_ACK, false, 0, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, SCALE_NONE, timestamps,
DF,ttl_orig,IP4_TOS(dis->ip),IP4_IP_ID_FIX(dis->ip),IP6_FLOW(dis->ip6),
@@ -1297,9 +1293,25 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
DLOG_ERR("cannot prepare split SYNACK ACK part\n");
goto send_orig;
}
DLOG("sending split SYNACK : ACK\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
goto send_orig;
t_synack_split ss[2] = {dp->synack_split, dp->synack_split==SS_ACK ? SS_SYN : SS_ACK};
int i;
for (int i=0;i<2;i++)
{
switch(ss[i])
{
case SS_SYN:
DLOG("sending split SYNACK : SYN\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , dis->data_pkt, dis->len_pkt))
goto send_orig;
break;
case SS_ACK:
DLOG("sending split SYNACK : ACK\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
goto send_orig;
break;
}
}
return VERDICT_DROP;
}