[PATCH] Add missing explicit PSH assignment

[Volker Diels-Grabsch <v@njh.eu>]

For packets with data, we set the PSH flag depending on whether it's
the last chunk of data in a single receive operation from a socket.
But then we reuse the same buffers for SYN segments, and oops, PSH is
set randomly.

This change cleans this up by setting PSH explicitly, just as we do
with the other flags.
---
 tcp.c          | 1 +
 tcp_internal.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/tcp.c b/tcp.c
index dba5fdc..a27b069 100644
--- a/tcp.c
+++ b/tcp.c
@@ -1176,6 +1176,7 @@ int tcp_prepare_flags(const struct ctx *c, struct tcp_tap_conn *conn,
 	th->doff = (sizeof(*th) + *optlen) / 4;
 
 	th->ack = !!(flags & ACK);
+	th->psh = !!(flags & PSH);
 	th->rst = !!(flags & RST);
 	th->syn = !!(flags & SYN);
 	th->fin = !!(flags & FIN);
diff --git a/tcp_internal.h b/tcp_internal.h
index 36c6533..9dae688 100644
--- a/tcp_internal.h
+++ b/tcp_internal.h
@@ -26,6 +26,7 @@
 #define FIN		(1 << 0)
 #define SYN		(1 << 1)
 #define RST		(1 << 2)
+#define PSH		(1 << 3)
 #define ACK		(1 << 4)
 
 /* Flags for internal usage */
-- 
@@ -26,6 +26,7 @@
 #define FIN		(1 << 0)
 #define SYN		(1 << 1)
 #define RST		(1 << 2)
+#define PSH		(1 << 3)
 #define ACK		(1 << 4)
 
 /* Flags for internal usage */
-- 
2.47.2