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Change single write timer to per-send timers

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Previously, there was a single per-socket write timer that would get
restarted for every new write.  This turned out to be insufficient
because the other side could keep reseting the timer, and never reading
back the responses.

Change the single write timer to per-send timer which would in turn
reset the TCP connection on the first send timeout.
This commit is contained in:
Ondřej Surý
2022-03-10 13:51:08 +01:00
parent 1357d44605
commit a761aa59e3
7 changed files with 71 additions and 186 deletions
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23
lib/isc/netmgr/netmgr.c
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@@ -1985,11 +1985,15 @@ isc__nm_accept_connection_log(isc_result_t result, bool can_log_quota) {
}
void
isc__nmsocket_writetimeout_cb(uv_timer_t *timer) {
isc_nmsocket_t *sock = uv_handle_get_data((uv_handle_t *)timer);
isc__nmsocket_writetimeout_cb(void *data, isc_result_t eresult) {
isc__nm_uvreq_t *req = data;
isc_nmsocket_t *sock = NULL;
int r = uv_timer_stop(&sock->write_timer);
UV_RUNTIME_CHECK(uv_timer_stop, r);
REQUIRE(eresult == ISC_R_TIMEDOUT);
REQUIRE(VALID_UVREQ(req));
REQUIRE(VALID_NMSOCK(req->sock));
sock = req->sock;
isc__nmsocket_reset(sock);
}
@@ -2802,6 +2806,13 @@ isc__nm_async_detach(isc__networker_t *worker, isc__netievent_t *ev0) {
nmhandle_detach_cb(&ievent->handle FLARG_PASS);
}
static void
reset_shutdown(uv_handle_t *handle) {
isc_nmsocket_t *sock = uv_handle_get_data(handle);
isc__nmsocket_shutdown(sock);
}
void
isc__nmsocket_reset(isc_nmsocket_t *sock) {
REQUIRE(VALID_NMSOCK(sock));
@@ -2827,10 +2838,10 @@ isc__nmsocket_reset(isc_nmsocket_t *sock) {
* The real shutdown will be handled in the respective
* close functions.
*/
int r = uv_tcp_close_reset(&sock->uv_handle.tcp, NULL);
int r = uv_tcp_close_reset(&sock->uv_handle.tcp,
reset_shutdown);
UV_RUNTIME_CHECK(uv_tcp_close_reset, r);
}
isc__nmsocket_shutdown(sock);
}
void