tcp: close connection if not recovered after max tries

[vpp.git] / src / vnet / tcp / tcp_output.c

diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 518a80d..c9ffd00 100644 (file)
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1132,7 +1132,6 @@ tcp_session_push_header (transport_connection_t * tconn, vlib_buffer_t * b)
   tcp_push_hdr_i (tc, b, tc->snd_nxt, /* compute opts */ 0, /* burst */ 1,
                  /* update_snd_nxt */ 1);
   tc->snd_una_max = seq_max (tc->snd_nxt, tc->snd_una_max);
-  ASSERT (seq_leq (tc->snd_una_max, tc->snd_una + tc->snd_wnd));
   tcp_validate_txf_size (tc, tc->snd_una_max - tc->snd_una);
   /* If not tracking an ACK, start tracking */
   if (tc->rtt_ts == 0 && !tcp_in_cong_recovery (tc))
@@ -1518,6 +1517,19 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
          tcp_update_rto (tc);
        }
 
+      /* Peer is dead or network connectivity is lost. Close connection.
+       * RFC 1122 section 4.2.3.5 recommends a value of at least 100s. For
+       * a min rto of 0.2s we need to retry about 8 times. */
+      if (tc->rto_boff >= TCP_RTO_BOFF_MAX)
+       {
+         tcp_send_reset (tc);
+         tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+         session_transport_closing_notify (&tc->connection);
+         tcp_connection_timers_reset (tc);
+         tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLOSEWAIT_TIME);
+         return;
+       }
+
       /* Increment RTO backoff (also equal to number of retries) and go back
        * to first un-acked byte  */
       tc->rto_boff += 1;