- /* 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
* derivatives without specific, written prior permission.
*/
+#include <config.h>
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <poll.h>
+#include <regex.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "command-line.h"
#include "compiler.h"
#include "daemon.h"
+#include "dhcp.h"
+#include "dhcp-client.h"
#include "fault.h"
#include "flow.h"
#include "learning-switch.h"
static struct list relays = LIST_INITIALIZER(&relays);
-/* Enable the local port? */
-static int local_port;
+/* Mode of operation. Note that autodiscovery implies in-band
+ * communication. */
+static bool autodiscovery; /* Discover the controller automatically? */
+static bool in_band; /* Connect to controller in-band? */
/* MAC address of local port. */
static uint8_t local_mac[ETH_ADDR_LEN];
/* MAC learning table for local port. */
static struct mac_learning *local_ml;
+/* Controller vconn name, or null to perform controller autodiscovery. */
+static char *controller_name = NULL;
+
/* -f, --fail: Behavior when the connection to the controller fails. */
static enum fail_mode fail_mode = FAIL_OPEN;
+/* The OpenFlow virtual network device ofX. */
+static struct netdev *of_device;
+
/* --inactivity-probe: Number of seconds without receiving a message from the
controller before sending an inactivity probe. */
static int probe_interval = 15;
* fail-open mode. */
static int max_idle = 15;
+/* --max-backoff: Maximum interval between controller connection attempts, in
+ * seconds. */
+static int max_backoff = 15;
+
+/* DHCP client, for controller autodiscovery. */
+static struct dhclient *dhcp;
+
+/* --accept-vconn: Regular expression specifying the class of controller vconns
+ * that we will accept during autodiscovery. */
+static const char *accept_controller_re;
+static regex_t accept_controller_regex;
+
static void parse_options(int argc, char *argv[]);
static void usage(void) NO_RETURN;
static void relay_destroy(struct relay *);
static bool local_hook(struct relay *r);
+static bool failing_open(struct relay *r);
static bool fail_open_hook(struct relay *r);
+static void modify_dhcp_request(struct dhcp_msg *, void *aux);
+static bool validate_dhcp_offer(const struct dhcp_msg *, void *aux);
+
int
main(int argc, char *argv[])
{
+ struct rconn *local_rconn, *remote_rconn;
struct vconn *listen_vconn;
- struct netdev *of_device;
+ struct relay *controller_relay;
const char *nl_name;
char of_name[16];
int retval;
vlog_init();
parse_options(argc, argv);
- if (argc - optind != 2) {
- fatal(0,
- "need exactly two non-option arguments; use --help for usage");
+ argc -= optind;
+ argv += optind;
+ if (argc < 1 || argc > 2) {
+ fatal(0, "need one or two non-option arguments; use --help for usage");
}
- nl_name = argv[optind];
+ nl_name = argv[0];
if (strncmp(nl_name, "nl:", 3)
|| strlen(nl_name) < 4
|| nl_name[strspn(nl_name + 3, "0123456789") + 3]) {
fatal(0, "%s: argument is not of the form \"nl:DP_IDX\"", nl_name);
}
+ controller_name = argc > 1 ? xstrdup(argv[1]) : NULL;
+ autodiscovery = controller_name == NULL;
+
+ if (!accept_controller_re) {
+ accept_controller_re = vconn_ssl_is_configured() ? "^ssl:.*" : ".*";
+ }
+ retval = regcomp(&accept_controller_regex, accept_controller_re,
+ REG_NOSUB | REG_EXTENDED);
+ if (retval) {
+ size_t length = regerror(retval, &accept_controller_regex, NULL, 0);
+ char *buffer = xmalloc(length);
+ regerror(retval, &accept_controller_regex, buffer, length);
+ fatal(0, "%s: %s", accept_controller_re, buffer);
+ }
if (listen_vconn_name) {
retval = vconn_open(listen_vconn_name, &listen_vconn);
}
snprintf(of_name, sizeof of_name, "of%s", nl_name + 3);
- retval = netdev_open(of_name, &of_device);
+ retval = netdev_open(of_name, NETDEV_ETH_TYPE_NONE, &of_device);
if (!retval) {
enum netdev_flags flags;
+
+ if (autodiscovery) {
+ retval = netdev_turn_flags_on(of_device, NETDEV_UP, true);
+ if (retval) {
+ fatal(retval, "Could not bring %s device up", of_name);
+ }
+ }
+
retval = netdev_get_flags(of_device, &flags);
if (!retval) {
if (flags & NETDEV_UP) {
struct in6_addr in6;
- local_port = true;
+ in_band = true;
memcpy(local_mac, netdev_get_etheraddr(of_device),
ETH_ADDR_LEN);
if (netdev_get_in6(of_device, &in6)) {
"IPv6 not supported", of_name);
}
local_ml = mac_learning_create();
- }
+ }
} else {
error(retval, "Could not get flags for %s device", of_name);
}
- netdev_close(of_device);
} else {
error(retval, "Could not open %s device", of_name);
}
+ if (autodiscovery && !in_band) {
+ fatal(retval, "In autodiscovery mode but failed to configure "
+ "in-band control");
+ }
+
+ if (autodiscovery) {
+ retval = dhclient_create(of_name, modify_dhcp_request,
+ validate_dhcp_offer, NULL, &dhcp);
+ if (retval) {
+ fatal(retval, "Failed to initialize DHCP client");
+ }
+ dhclient_init(dhcp, 0);
+ }
retval = vlog_server_listen(NULL, NULL);
if (retval) {
daemonize();
- relay_create(rconn_new(argv[optind], 1, 0),
- rconn_new(argv[optind + 1], 1, probe_interval),
- false);
+ local_rconn = rconn_create(1, 0, max_backoff);
+ rconn_connect(local_rconn, nl_name);
+
+ remote_rconn = rconn_create(1, probe_interval, max_backoff);
+ if (controller_name) {
+ retval = rconn_connect(remote_rconn, controller_name);
+ if (retval == EAFNOSUPPORT) {
+ fatal(0, "No support for %s vconn", controller_name);
+ }
+ }
+ controller_relay = relay_create(local_rconn, remote_rconn, false);
for (;;) {
struct relay *r, *n;
new_management_connection(nl_name, new_remote);
}
}
+ if (controller_relay) {
+ /* FIXME: should also fail open when controller_relay is NULL. */
+ failing_open(controller_relay);
+ }
+ if (dhcp) {
+ if (rconn_is_connectivity_questionable(remote_rconn)) {
+ dhclient_force_renew(dhcp, 15);
+ }
+ dhclient_run(dhcp);
+ if (dhclient_changed(dhcp)) {
+ free(controller_name);
+ if (dhclient_is_bound(dhcp)) {
+ controller_name = dhcp_msg_get_string(
+ dhclient_get_config(dhcp),
+ DHCP_CODE_OFP_CONTROLLER_VCONN);
+ VLOG_WARN("%s: discovered controller",
+ controller_name);
+ rconn_connect(remote_rconn, controller_name);
+ } else if (controller_name) {
+ VLOG_WARN("%s: discover controller no longer available",
+ controller_name);
+ controller_name = NULL;
+ rconn_disconnect(remote_rconn);
+ }
+ }
+ }
/* Wait for something to happen. */
LIST_FOR_EACH (r, struct relay, node, &relays) {
if (listen_vconn) {
vconn_accept_wait(listen_vconn);
}
+ if (dhcp) {
+ dhclient_wait(dhcp);
+ }
poll_block();
}
}
/* 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);
+ r1 = rconn_create(1, 0, 0);
+ rconn_connect_unreliably(r1, nl_name_without_subscription, new_local);
+ r2 = rconn_create(1, 0, 0);
+ rconn_connect_unreliably(r2, "passive", new_remote);
relay_create(r1, r2, true);
free(nl_name_without_subscription);
}
}
- for (i = 0; i < 2; i++) {
- struct half *this = &r->halves[i];
- if (!rconn_is_alive(this->rconn)) {
- relay_destroy(r);
- return;
+ if (r->is_mgmt_conn) {
+ for (i = 0; i < 2; i++) {
+ struct half *this = &r->halves[i];
+ if (!rconn_is_alive(this->rconn)) {
+ relay_destroy(r);
+ return;
+ }
}
}
}
free(r);
}
+static void
+queue_tx(struct rconn *rc, struct buffer *b)
+{
+ if (rconn_force_send(rc, b)) {
+ buffer_delete(b);
+ }
+}
+
+static bool
+is_controller_mac(const uint8_t dl_addr[ETH_ADDR_LEN],
+ struct rconn *controller)
+{
+ static uint32_t ip, last_nonzero_ip;
+ static uint8_t mac[ETH_ADDR_LEN], last_nonzero_mac[ETH_ADDR_LEN];
+ static time_t next_refresh = 0;
+
+ uint32_t last_ip = ip;
+
+ time_t now = time(0);
+
+ ip = rconn_get_ip(controller);
+ if (last_ip != ip || !next_refresh || now >= next_refresh) {
+ bool have_mac;
+
+ /* Look up MAC address. */
+ memset(mac, 0, sizeof mac);
+ if (ip) {
+ int retval = netdev_arp_lookup(of_device, ip, mac);
+ if (retval) {
+ VLOG_DBG("cannot look up controller hw address ("IP_FMT"): %s",
+ IP_ARGS(&ip), strerror(retval));
+ }
+ }
+ have_mac = !eth_addr_is_zero(mac);
+
+ /* Log changes in IP, MAC addresses. */
+ if (ip && ip != last_nonzero_ip) {
+ VLOG_DBG("controller IP address changed from "IP_FMT
+ " to "IP_FMT, IP_ARGS(&last_nonzero_ip), IP_ARGS(&ip));
+ last_nonzero_ip = ip;
+ }
+ if (have_mac && memcmp(last_nonzero_mac, mac, ETH_ADDR_LEN)) {
+ VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to "
+ ETH_ADDR_FMT,
+ ETH_ADDR_ARGS(last_nonzero_mac), ETH_ADDR_ARGS(mac));
+ memcpy(last_nonzero_mac, mac, ETH_ADDR_LEN);
+ }
+
+ /* Schedule next refresh.
+ *
+ * If we have an IP address but not a MAC address, then refresh
+ * quickly, since we probably will get a MAC address soon (via ARP).
+ * Otherwise, we can afford to wait a little while. */
+ next_refresh = now + (!ip || have_mac ? 10 : 1);
+ }
+ return !eth_addr_is_zero(mac) && eth_addr_equals(mac, dl_addr);
+}
+
static bool
local_hook(struct relay *r)
{
struct ofp_packet_in *opi;
struct ofp_header *oh;
size_t pkt_ofs, pkt_len;
- struct buffer pkt, *b;
+ struct buffer pkt;
struct flow flow;
uint16_t in_port, out_port;
- if (!local_port) {
+ if (!in_band) {
return false;
}
VLOG_DBG("learned that "ETH_ADDR_FMT" is on port %"PRIu16,
ETH_ADDR_ARGS(flow.dl_src), in_port);
}
+ } else if (flow.dl_type == htons(ETH_TYPE_ARP)
+ && eth_addr_is_broadcast(flow.dl_dst)
+ && is_controller_mac(flow.dl_src,
+ r->halves[HALF_REMOTE].rconn)) {
+ out_port = OFPP_FLOOD;
} else {
return false;
}
- /* Add new flow. */
if (out_port != OFPP_FLOOD) {
- b = make_add_simple_flow(&flow, ntohl(opi->buffer_id), out_port,
- max_idle);
- if (rconn_force_send(rc, b)) {
- buffer_delete(b);
- }
- }
+ /* The output port is known, so add a new flow. */
+ queue_tx(rc, make_add_simple_flow(&flow, ntohl(opi->buffer_id),
+ out_port, max_idle));
- /* If the switch didn't buffer the packet, we need to send a copy. */
- if (out_port == OFPP_FLOOD || ntohl(opi->buffer_id) == UINT32_MAX) {
- b = make_unbuffered_packet_out(&pkt, in_port, out_port);
- if (rconn_force_send(rc, b)) {
- buffer_delete(b);
+ /* If the switch didn't buffer the packet, we need to send a copy. */
+ if (ntohl(opi->buffer_id) == UINT32_MAX) {
+ queue_tx(rc, make_unbuffered_packet_out(&pkt, in_port, out_port));
+ }
+ } else {
+ /* We don't know that MAC. Send along the packet without setting up a
+ * flow. */
+ struct buffer *b;
+ if (ntohl(opi->buffer_id) == UINT32_MAX) {
+ b = make_unbuffered_packet_out(&pkt, in_port, out_port);
+ } else {
+ b = make_buffered_packet_out(ntohl(opi->buffer_id),
+ in_port, out_port);
}
+ queue_tx(rc, b);
}
return true;
}
+/* Causess 'r' to enter or leave fail-open mode, if appropriate. Returns true
+ * if 'r' is in fail-open fail, false otherwise. */
static bool
-fail_open_hook(struct relay *r)
+failing_open(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;
"failing open", disconnected_duration);
r->lswitch = lswitch_create(local, true, max_idle);
}
-
- /* Do switching. */
- lswitch_process_packet(r->lswitch, local, msg);
- rconn_run(local);
return true;
}
+static bool
+fail_open_hook(struct relay *r)
+{
+ if (!failing_open(r)) {
+ return false;
+ } else {
+ struct buffer *msg = r->halves[HALF_LOCAL].rxbuf;
+ struct rconn *local = r->halves[HALF_LOCAL].rconn;
+ lswitch_process_packet(r->lswitch, local, msg);
+ rconn_run(local);
+ return true;
+ }
+}
+
+static void
+modify_dhcp_request(struct dhcp_msg *msg, void *aux)
+{
+ dhcp_msg_put_string(msg, DHCP_CODE_VENDOR_CLASS, "OpenFlow");
+}
+
+static bool
+validate_dhcp_offer(const struct dhcp_msg *msg, void *aux)
+{
+ char *vconn_name;
+ bool accept;
+
+ vconn_name = dhcp_msg_get_string(msg, DHCP_CODE_OFP_CONTROLLER_VCONN);
+ if (!vconn_name) {
+ VLOG_WARN("rejecting DHCP offer missing controller vconn");
+ return false;
+ }
+ accept = !regexec(&accept_controller_regex, vconn_name, 0, NULL, 0);
+ free(vconn_name);
+ return accept;
+}
+
static void
parse_options(int argc, char *argv[])
{
- enum { OPT_INACTIVITY_PROBE = UCHAR_MAX + 1, OPT_MAX_IDLE };
+ enum {
+ OPT_ACCEPT_VCONN = UCHAR_MAX + 1,
+ OPT_INACTIVITY_PROBE,
+ OPT_MAX_IDLE,
+ OPT_MAX_BACKOFF
+ };
static struct option long_options[] = {
+ {"accept-vconn", required_argument, 0, OPT_ACCEPT_VCONN},
{"fail", required_argument, 0, 'f'},
{"inactivity-probe", required_argument, 0, OPT_INACTIVITY_PROBE},
{"max-idle", required_argument, 0, OPT_MAX_IDLE},
+ {"max-backoff", required_argument, 0, OPT_MAX_BACKOFF},
{"listen", required_argument, 0, 'l'},
{"detach", no_argument, 0, 'D'},
{"pidfile", optional_argument, 0, 'P'},
}
switch (c) {
+ case OPT_ACCEPT_VCONN:
+ accept_controller_re = (optarg[0] == '^'
+ ? optarg
+ : xasprintf("^%s", optarg));
+ break;
+
case 'f':
if (!strcmp(optarg, "open")) {
fail_mode = FAIL_OPEN;
}
break;
+ case OPT_MAX_BACKOFF:
+ max_backoff = atoi(optarg);
+ if (max_backoff < 1) {
+ fatal(0, "--max-backoff argument must be at least 1");
+ } else if (max_backoff > 3600) {
+ max_backoff = 3600;
+ }
+ break;
+
case 'D':
set_detach();
break;
usage(void)
{
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",
+ "usage: %s [OPTIONS] nl:DP_IDX [CONTROLLER]\n"
+ "where nl:DP_IDX is a datapath that has been added with dpctl.\n"
+ "CONTROLLER is an active OpenFlow connection method; if it is\n"
+ "omitted, then secchan performs controller autodiscovery.\n",
program_name, program_name);
vconn_usage(true, true);
printf("\nNetworking options:\n"
+ " --accept-vconn=REGEX accept matching discovered controllers\n"
" -f, --fail=open|closed when controller connection fails:\n"
" closed: drop all packets\n"
" open (default): act as learning switch\n"
" --inactivity-probe=SECS time between inactivity probes\n"
" --max-idle=SECS max idle for flows set up by secchan\n"
+ " --max-backoff=SECS max time between controller connection\n"
+ " attempts (default: 15 seconds)\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=MODULE[:FACILITY[:LEVEL]] set logging levels\n"
" -v, --verbose set maximum verbosity level\n"
" -h, --help display this help message\n"
" -V, --version display version information\n",
git://git.onelab.eu / sliver-openvswitch.git / blobdiff