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nfqws2: add comments

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bol-van
2026-01-13 10:38:00 +03:00
parent 2302ac6949
commit 9cded5448a
1 changed files with 8 additions and 2 deletions
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10
nfq2/desync.c
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@@ -2013,6 +2013,8 @@ static uint8_t dpi_desync_packet_play(
struct dissect dis;
uint8_t verdict = VERDICT_PASS;
// NOTE ! OS can pass wrong checksum to queue. cannot rely on it !
proto_dissect_l3l4(data_pkt, len_pkt, &dis);
if (!!dis.ip != !!dis.ip6)
{
@@ -2023,7 +2025,8 @@ static uint8_t dpi_desync_packet_play(
if (dis.tcp)
{
verdict = dpi_desync_tcp_packet_play(replay_piece, replay_piece_count, reasm_offset, fwmark, ifin, ifout, tpos, &dis, mod_pkt, len_mod_pkt);
// fix csum if unmodified and if OS can pass wrong csum to queue
// fix csum if unmodified and if OS can pass wrong csum to queue (depends on OS)
// modified means we have already fixed the checksum or made it invalid intentionally
verdict_tcp_csum_fix(verdict, (struct tcphdr *)dis.tcp, dis.transport_len, dis.ip, dis.ip6);
}
break;
@@ -2031,7 +2034,8 @@ static uint8_t dpi_desync_packet_play(
if (dis.udp)
{
verdict = dpi_desync_udp_packet_play(replay_piece, replay_piece_count, reasm_offset, fwmark, ifin, ifout, tpos, &dis, mod_pkt, len_mod_pkt);
// fix csum if unmodified and if OS can pass wrong csum to queue
// fix csum if unmodified and if OS can pass wrong csum to queue (depends on OS)
// modified means we have already fixed the checksum or made it invalid intentionally
verdict_udp_csum_fix(verdict, (struct udphdr *)dis.udp, dis.transport_len, dis.ip, dis.ip6);
}
break;
@@ -2041,6 +2045,8 @@ static uint8_t dpi_desync_packet_play(
}
uint8_t dpi_desync_packet(uint32_t fwmark, const char *ifin, const char *ifout, const uint8_t *data_pkt, size_t len_pkt, uint8_t *mod_pkt, size_t *len_mod_pkt)
{
// NOTE ! OS can pass wrong checksum to queue. cannot rely on it !
ipcachePurgeRateLimited(&params.ipcache, params.ipcache_lifetime);
return dpi_desync_packet_play(0, 0, 0, fwmark, ifin, ifout, NULL, data_pkt, len_pkt, mod_pkt, len_mod_pkt);
}