diff options
Diffstat (limited to 'tcp.c')
| -rw-r--r-- | tcp.c | 39 |
1 files changed, 39 insertions, 0 deletions
@@ -206,6 +206,12 @@ * keepalives) will be removed between INACTIVITY_INTERVAL s and * 2*INACTIVITY_INTERVAL s after the last activity. * + * - KEEPALIVE_INTERVAL: if a connection has had no tap-side activity for an + * entire interval, send a tap-side keepalive. If the endpoint is no longer + * aware of the connection (due to a reboot, or a kernel timeout in FIN_WAIT_2 + * state) that should trigger an RST, so we won't keep track of connections + * that the guest endpoint no longer cares about. + * * Summary of data flows (with ESTABLISHED event) * ---------------------------------------------- * @@ -342,6 +348,7 @@ enum { #define RTO_INIT_AFTER_SYN_RETRIES 3 /* s, RFC 6298 */ #define INACTIVITY_INTERVAL 7200 /* s */ +#define KEEPALIVE_INTERVAL 30 /* s */ #define LOW_RTT_TABLE_SIZE 8 #define LOW_RTT_THRESHOLD 10 /* us */ @@ -2265,6 +2272,7 @@ int tcp_tap_handler(const struct ctx *c, uint8_t pif, sa_family_t af, } conn->inactive = false; + conn->tap_inactive = false; if (th->ack && !(conn->events & ESTABLISHED)) tcp_update_seqack_from_tap(c, conn, ntohl(th->ack_seq)); @@ -2887,6 +2895,36 @@ int tcp_init(struct ctx *c) } /** + * tcp_keepalive() - Send keepalives for connections which need it + * @: Execution context + */ +static void tcp_keepalive(struct ctx *c, const struct timespec *now) +{ + union flow *flow; + + if (now->tv_sec - c->tcp.keepalive_run < KEEPALIVE_INTERVAL) + return; + + c->tcp.keepalive_run = now->tv_sec; + + flow_foreach(flow) { + struct tcp_tap_conn *conn = &flow->tcp; + + if (flow->f.type != FLOW_TCP) + continue; + + if (conn->tap_inactive) { + flow_dbg(conn, "No tap activity for least %us, send keepalive", + KEEPALIVE_INTERVAL); + tcp_send_flag(c, conn, KEEPALIVE); + } + + /* Ready to check fot next interval */ + conn->tap_inactive = true; + } +} + +/** * tcp_inactivity() - Scan for and close long-inactive connections * @: Execution context */ @@ -2929,6 +2967,7 @@ void tcp_timer(struct ctx *c, const struct timespec *now) if (c->mode == MODE_PASTA) tcp_splice_refill(c); + tcp_keepalive(c, now); tcp_inactivity(c, now); } |