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/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "fail-open.h"
#include <inttypes.h>
#include <stdlib.h>
#include "flow.h"
#include "mac-learning.h"
#include "odp-util.h"
#include "ofproto.h"
#include "rconn.h"
#include "status.h"
#include "timeval.h"
#define THIS_MODULE VLM_fail_open
#include "vlog.h"
struct fail_open {
struct ofproto *ofproto;
struct rconn *controller;
int trigger_duration;
int last_disconn_secs;
struct status_category *ss_cat;
};
/* Causes the switch to enter or leave fail-open mode, if appropriate. */
void
fail_open_run(struct fail_open *fo)
{
int disconn_secs = rconn_failure_duration(fo->controller);
bool open = disconn_secs >= fo->trigger_duration;
if (open != (fo->last_disconn_secs != 0)) {
if (!open) {
flow_t flow;
VLOG_WARN("No longer in fail-open mode");
fo->last_disconn_secs = 0;
memset(&flow, 0, sizeof flow);
ofproto_delete_flow(fo->ofproto, &flow, OFPFW_ALL, 70000);
} else {
VLOG_WARN("Could not connect to controller for %d seconds, "
"failing open", disconn_secs);
fo->last_disconn_secs = disconn_secs;
/* Flush all OpenFlow and datapath flows. We will set up our
* fail-open rule from fail_open_flushed() when
* ofproto_flush_flows() calls back to us. */
ofproto_flush_flows(fo->ofproto);
}
} else if (open && disconn_secs > fo->last_disconn_secs + 60) {
VLOG_INFO("Still in fail-open mode after %d seconds disconnected "
"from controller", disconn_secs);
fo->last_disconn_secs = disconn_secs;
}
}
void
fail_open_wait(struct fail_open *fo UNUSED)
{
/* Nothing to do. */
}
void
fail_open_flushed(struct fail_open *fo)
{
int disconn_secs = rconn_failure_duration(fo->controller);
bool open = disconn_secs >= fo->trigger_duration;
if (open) {
union ofp_action action;
flow_t flow;
/* Set up a flow that matches every packet and directs them to
* OFPP_NORMAL. */
memset(&action, 0, sizeof action);
action.type = htons(OFPAT_OUTPUT);
action.output.len = htons(sizeof action);
action.output.port = htons(OFPP_NORMAL);
memset(&flow, 0, sizeof flow);
ofproto_add_flow(fo->ofproto, &flow, OFPFW_ALL, 70000,
&action, 1, 0);
}
}
static void
fail_open_status_cb(struct status_reply *sr, void *fo_)
{
struct fail_open *fo = fo_;
int cur_duration = rconn_failure_duration(fo->controller);
status_reply_put(sr, "trigger-duration=%d", fo->trigger_duration);
status_reply_put(sr, "current-duration=%d", cur_duration);
status_reply_put(sr, "triggered=%s",
cur_duration >= fo->trigger_duration ? "true" : "false");
}
struct fail_open *
fail_open_create(struct ofproto *ofproto,
int trigger_duration, struct switch_status *switch_status,
struct rconn *controller)
{
struct fail_open *fo = xmalloc(sizeof *fo);
fo->ofproto = ofproto;
fo->controller = controller;
fo->trigger_duration = trigger_duration;
fo->last_disconn_secs = 0;
fo->ss_cat = switch_status_register(switch_status, "fail-open",
fail_open_status_cb, fo);
return fo;
}
void
fail_open_set_trigger_duration(struct fail_open *fo, int trigger_duration)
{
fo->trigger_duration = trigger_duration;
}
void
fail_open_destroy(struct fail_open *fo)
{
if (fo) {
/* We don't own fo->controller. */
switch_status_unregister(fo->ss_cat);
free(fo);
}
}
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