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authorliuyacan <liuyacan@corp.netease.com>2021-05-09 03:50:40 +0000
committerFlorin Coras <florin.coras@gmail.com>2021-05-12 04:45:07 +0000
commit534468e9f768ae7465ef722520dadfd916cdc9fb (patch)
tree7433d66e807340a2b5e0abbe152b6b944f32675d /src/vnet/tcp
parent7b2917fbe2a9ec17f69ca94fcbae534927915834 (diff)
session: support half-close connection
Some app(e.g. Envoy) may call shutdown() instead of close() when draining connection. Type: improvement Signed-off-by: liuyacan <liuyacan@corp.netease.com> Change-Id: I9543b9ca3caa87b10b134fd1fc4019124e41e4d2
Diffstat (limited to 'src/vnet/tcp')
-rw-r--r--src/vnet/tcp/tcp.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 90b832cd73d..16bf9451709 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -354,7 +354,6 @@ tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
* 2) TIME_WAIT (active close) whereby after 2MSL the 2MSL timer triggers
* and cleanup is called.
*
- * N.B. Half-close connections are not supported
*/
void
tcp_connection_close (tcp_connection_t * tc)
@@ -426,6 +425,30 @@ tcp_connection_close (tcp_connection_t * tc)
}
static void
+tcp_session_half_close (u32 conn_index, u32 thread_index)
+{
+ tcp_worker_ctx_t *wrk;
+ tcp_connection_t *tc;
+
+ tc = tcp_connection_get (conn_index, thread_index);
+ wrk = tcp_get_worker (tc->c_thread_index);
+
+ /* If the connection is not in ESTABLISHED state, ignore it */
+ if (tc->state != TCP_STATE_ESTABLISHED)
+ return;
+ if (!transport_max_tx_dequeue (&tc->connection))
+ tcp_send_fin (tc);
+ else
+ tc->flags |= TCP_CONN_FINPNDG;
+ tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
+ /* Set a timer in case the peer stops responding. Otherwise the
+ * connection will be stuck here forever. */
+ ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
+ tcp_timer_set (&wrk->timer_wheel, tc, TCP_TIMER_WAITCLOSE,
+ tcp_cfg.finwait1_time);
+}
+
+static void
tcp_session_close (u32 conn_index, u32 thread_index)
{
tcp_connection_t *tc;
@@ -1316,6 +1339,7 @@ const static transport_proto_vft_t tcp_proto = {
.get_half_open = tcp_half_open_session_get_transport,
.attribute = tcp_session_attribute,
.connect = tcp_session_open,
+ .half_close = tcp_session_half_close,
.close = tcp_session_close,
.cleanup = tcp_session_cleanup,
.cleanup_ho = tcp_session_cleanup_ho,