-/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ /* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
* Junior University
*
* We are making the OpenFlow specification and associated documentation
#include "buffer.h"
#include "command-line.h"
#include "compiler.h"
+#include "daemon.h"
#include "fault.h"
#include "flow.h"
+#include "learning-switch.h"
#include "list.h"
#include "mac-learning.h"
#include "netdev.h"
struct buffer *rxbuf;
};
+/* Behavior when the connection to the controller fails. */
+enum fail_mode {
+ FAIL_OPEN, /* Act as learning switch. */
+ FAIL_CLOSED /* Drop all packets. */
+};
+
struct relay {
struct list node;
#define HALF_LOCAL 0
#define HALF_REMOTE 1
struct half halves[2];
+
+ bool is_mgmt_conn;
+ struct lswitch *lswitch;
};
static struct list relays = LIST_INITIALIZER(&relays);
/* MAC learning table for local port. */
static struct mac_learning *local_ml;
+/* -f, --fail: Behavior when the connection to the controller fails. */
+static enum fail_mode fail_mode = FAIL_OPEN;
+
+/* -d, --fail-open-delay: Number of seconds after which to fail open, when
+ * fail_mode is FAIL_OPEN. */
+static int fail_open_delay = 30;
+
static void parse_options(int argc, char *argv[]);
static void usage(void) NO_RETURN;
static void new_management_connection(const char *nl_name, struct vconn *new_remote);
-static void relay_create(struct rconn *local, struct rconn *remote);
+static struct relay *relay_create(struct rconn *local, struct rconn *remote,
+ bool is_mgmt_conn);
static void relay_run(struct relay *);
static void relay_wait(struct relay *);
static void relay_destroy(struct relay *);
static bool local_hook(struct relay *r);
+static bool fail_open_hook(struct relay *r);
int
main(int argc, char *argv[])
listen_vconn = NULL;
}
-
snprintf(of_name, sizeof of_name, "of%s", nl_name + 3);
retval = netdev_open(of_name, &of_device);
if (!retval) {
fatal(retval, "Could not listen for vlog connections");
}
- relay_create(rconn_new(argv[optind], 1), rconn_new(argv[optind + 1], 1));
+ daemonize();
+
+ relay_create(rconn_new(argv[optind], 1), rconn_new(argv[optind + 1], 1),
+ false);
for (;;) {
struct relay *r, *n;
VLOG_ERR("could not connect to %s (%s)",
nl_name_without_subscription, strerror(retval));
vconn_close(new_remote);
+ free(nl_name_without_subscription);
return;
}
- free(nl_name_without_subscription);
/* Add it to the relay list. */
r1 = rconn_new_from_vconn(nl_name_without_subscription, 1, new_local);
r2 = rconn_new_from_vconn("passive", 1, new_remote);
- relay_create(r1, r2);
+ relay_create(r1, r2, true);
+
+ free(nl_name_without_subscription);
}
-static void
-relay_create(struct rconn *local, struct rconn *remote)
+static struct relay *
+relay_create(struct rconn *local, struct rconn *remote, bool is_mgmt_conn)
{
struct relay *r;
int i;
for (i = 0; i < 2; i++) {
r->halves[i].rxbuf = NULL;
}
+ r->is_mgmt_conn = is_mgmt_conn;
+ r->lswitch = NULL;
list_push_back(&relays, &r->node);
+ return r;
}
static void
if (!this->rxbuf) {
this->rxbuf = rconn_recv(this->rconn);
- if (this->rxbuf && i == HALF_LOCAL && local_hook(r)) {
+ if (this->rxbuf && !r->is_mgmt_conn && i == HALF_LOCAL
+ && (local_hook(r) || fail_open_hook(r))) {
buffer_delete(this->rxbuf);
this->rxbuf = NULL;
}
return true;
}
+static bool
+fail_open_hook(struct relay *r)
+{
+ struct buffer *msg = r->halves[HALF_LOCAL].rxbuf;
+ struct rconn *local = r->halves[HALF_LOCAL].rconn;
+ struct rconn *remote = r->halves[HALF_REMOTE].rconn;
+ int disconnected_duration;
+
+ if (fail_mode == FAIL_CLOSED) {
+ /* We fail closed, so there's never anything to do. */
+ return false;
+ }
+
+ disconnected_duration = rconn_disconnected_duration(remote);
+ if (disconnected_duration < fail_open_delay) {
+ /* It's not time to fail open yet. */
+ if (r->lswitch && rconn_is_connected(remote)) {
+ /* We're connected, so drop the learning switch. */
+ VLOG_WARN("No longer in fail-open mode");
+ lswitch_destroy(r->lswitch);
+ r->lswitch = NULL;
+ }
+ return false;
+ }
+
+ if (!r->lswitch) {
+ VLOG_WARN("Could not connect to controller for %d seconds, "
+ "failing open", disconnected_duration);
+ r->lswitch = lswitch_create(local, true, true);
+ }
+
+ /* Do switching. */
+ lswitch_process_packet(r->lswitch, local, msg);
+ rconn_run(local);
+ return true;
+}
+
static void
parse_options(int argc, char *argv[])
{
static struct option long_options[] = {
+ {"fail", required_argument, 0, 'f'},
+ {"fail-open-delay", required_argument, 0, 'd'},
{"listen", required_argument, 0, 'l'},
+ {"detach", no_argument, 0, 'D'},
+ {"pidfile", optional_argument, 0, 'P'},
{"verbose", optional_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
}
switch (c) {
+ case 'f':
+ if (!strcmp(optarg, "open")) {
+ fail_mode = FAIL_OPEN;
+ } else if (!strcmp(optarg, "closed")) {
+ fail_mode = FAIL_CLOSED;
+ } else {
+ fatal(0,
+ "-f or --fail argument must be \"open\" or \"closed\"");
+ }
+ break;
+
+ case 'd':
+ fail_open_delay = atoi(optarg);
+ if (fail_open_delay < 1) {
+ fatal(0,
+ "-d or --fail-open-delay argument must be at least 1");
+ }
+ break;
+
+ case 'D':
+ set_detach();
+ break;
+
+ case 'P':
+ set_pidfile(optarg ? optarg : "secchan.pid");
+ break;
+
case 'l':
if (listen_vconn_name) {
fatal(0, "-l or --listen may be only specified once");
static void
usage(void)
{
- printf("%s: Secure Channel, a relay for OpenFlow messages.\n"
- "usage: %s [OPTIONS] LOCAL REMOTE\n"
- "where LOCAL and REMOTE are active OpenFlow connection methods.\n",
+ printf("%s: secure channel, a relay for OpenFlow messages.\n"
+ "usage: %s [OPTIONS] nl:DP_IDX CONTROLLER\n"
+ "where nl:DP_IDX is a datapath that has been added with dpctl\n"
+ "and CONTROLLER is an active OpenFlow connection method.\n",
program_name, program_name);
vconn_usage(true, true);
printf("\nNetworking options:\n"
+ " -f, --fail=open|closed when controller connection fails:\n"
+ " closed: drop all packets\n"
+ " open (default): act as learning switch\n"
+ " -d, --fail-open-delay=SECS number of seconds after which to\n"
+ " fail open if --fail=open (default: 30)\n"
" -l, --listen=METHOD allow management connections on METHOD\n"
" (a passive OpenFlow connection method)\n"
"\nOther options:\n"
+ " -D, --detach run in background as daemon\n"
+ " -P, --pidfile[=FILE] create pidfile (default: %s/secchan.pid)\n"
+ " -v, --verbose=MODULE:FACILITY:LEVEL configure logging levels\n"
" -v, --verbose set maximum verbosity level\n"
" -h, --help display this help message\n"
- " -V, --version display version information\n");
+ " -V, --version display version information\n",
+ RUNDIR);
exit(EXIT_SUCCESS);
}
projects / openvswitch / blobdiff