-/* Copyright (C) 2007 Board of Trustees, Leland Stanford Jr. University.
+/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
+ * Junior University
*
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to
- * deal in the Software without restriction, including without limitation the
- * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
- * sell copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
+ * We are making the OpenFlow specification and associated documentation
+ * (Software) available for public use and benefit with the expectation
+ * that others will use, modify and enhance the Software and contribute
+ * those enhancements back to the community. However, since we would
+ * like to make the Software available for broadest use, with as few
+ * restrictions as possible permission is hereby granted, free of
+ * charge, to any person obtaining a copy of this Software to deal in
+ * the Software under the copyrights without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
*
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
*
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * The name and trademarks of copyright holder(s) may NOT be used in
+ * advertising or publicity pertaining to the Software or any
+ * derivatives without specific, written prior permission.
*/
+#include <config.h>
+#include <assert.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 "buffer.h"
#include "command-line.h"
#include "compiler.h"
+#include "daemon.h"
+#include "dhcp.h"
+#include "dhcp-client.h"
+#include "dynamic-string.h"
#include "fault.h"
+#include "flow.h"
+#include "learning-switch.h"
+#include "list.h"
+#include "mac-learning.h"
+#include "netdev.h"
+#include "openflow.h"
+#include "packets.h"
+#include "poll-loop.h"
+#include "rconn.h"
+#include "timeval.h"
#include "util.h"
+#include "vconn-ssl.h"
#include "vconn.h"
#include "vlog-socket.h"
-#include "openflow.h"
#include "vlog.h"
#define THIS_MODULE VLM_secchan
-static void parse_options(int argc, char *argv[]);
-static void usage(void) NO_RETURN;
+/* Behavior when the connection to the controller fails. */
+enum fail_mode {
+ FAIL_OPEN, /* Act as learning switch. */
+ FAIL_CLOSED /* Drop all packets. */
+};
-static bool reliable = true;
+/* Settings that may be configured by the user. */
+struct settings {
+ /* Overall mode of operation. */
+ bool discovery; /* Discover the controller automatically? */
+ bool in_band; /* Connect to controller in-band? */
+
+ /* Related vconns and network devices. */
+ const char *nl_name; /* Local datapath (must be "nl:" vconn). */
+ char *of_name; /* ofX network device name. */
+ const char *controller_name; /* Controller (if not discovery mode). */
+ const char *listen_vconn_name; /* Listens for mgmt connections. */
+
+ /* Failure behavior. */
+ enum fail_mode fail_mode; /* Act as learning switch if no controller? */
+ int max_idle; /* Idle time for flows in fail-open mode. */
+ int probe_interval; /* # seconds idle before sending echo request. */
+ int max_backoff; /* Max # seconds between connection attempts. */
+
+ /* Discovery behavior. */
+ regex_t accept_controller_regex; /* Controller vconns to accept. */
+ const char *accept_controller_re; /* String version of regex. */
+ bool update_resolv_conf; /* Update /etc/resolv.conf? */
+};
struct half {
- const char *name;
- struct vconn *vconn;
- struct pollfd *pollfd;
+ struct rconn *rconn;
struct buffer *rxbuf;
- time_t backoff_deadline;
- int backoff;
};
-static void reconnect(struct half *);
+struct relay {
+ struct list node;
+
+#define HALF_LOCAL 0
+#define HALF_REMOTE 1
+ struct half halves[2];
+
+ bool is_mgmt_conn;
+};
+
+struct hook {
+ bool (*packet_cb)(struct relay *, int half, void *aux);
+ void (*periodic_cb)(void *aux);
+ void *aux;
+};
+
+static void parse_options(int argc, char *argv[], struct settings *);
+static void usage(void) NO_RETURN;
+
+static struct relay *relay_create(struct rconn *local, struct rconn *remote,
+ bool is_mgmt_conn);
+static struct relay *relay_accept(const struct settings *, struct vconn *);
+static void relay_run(struct relay *, const struct hook[], size_t n_hooks);
+static void relay_wait(struct relay *);
+static void relay_destroy(struct relay *);
+
+static struct hook make_hook(bool (*packet_cb)(struct relay *, int, void *),
+ void (*periodic_cb)(void *),
+ void *aux);
+
+static struct discovery *discovery_init(const struct settings *);
+static void discovery_question_connectivity(struct discovery *);
+static bool discovery_run(struct discovery *, char **controller_name);
+static void discovery_wait(struct discovery *);
+
+static struct hook in_band_hook_create(const struct settings *);
+static struct hook fail_open_hook_create(const struct settings *,
+ struct rconn *local,
+ struct rconn *remote);
+
+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 half halves[2];
- struct pollfd pollfds[2 + 1];
- struct vlog_server *vlog_server;
+ struct settings s;
+
+ struct list relays = LIST_INITIALIZER(&relays);
+
+ struct hook hooks[3];
+ size_t n_hooks;
+
+ struct rconn *local_rconn, *remote_rconn;
+ struct vconn *listen_vconn;
+ struct relay *controller_relay;
+ struct discovery *discovery;
int retval;
- int i;
set_program_name(argv[0]);
register_fault_handlers();
+ time_init();
vlog_init();
- parse_options(argc, argv);
+ parse_options(argc, argv, &s);
- if (argc - optind != 2) {
- fatal(0, "exactly two peer arguments required; use --help for usage");
+ /* Start listening for management connections. */
+ if (s.listen_vconn_name) {
+ retval = vconn_open(s.listen_vconn_name, &listen_vconn);
+ if (retval && retval != EAGAIN) {
+ fatal(retval, "opening %s", s.listen_vconn_name);
+ }
+ if (!vconn_is_passive(listen_vconn)) {
+ fatal(0, "%s is not a passive vconn", s.listen_vconn_name);
+ }
+ } else {
+ listen_vconn = NULL;
}
- retval = vlog_server_listen(NULL, &vlog_server);
+ /* Start controller discovery. */
+ discovery = s.discovery ? discovery_init(&s) : NULL;
+
+ /* Start listening for vlogconf requests. */
+ retval = vlog_server_listen(NULL, NULL);
if (retval) {
fatal(retval, "Could not listen for vlog connections");
}
- for (i = 0; i < 2; i++) {
- halves[i].name = argv[optind + i];
- halves[i].vconn = NULL;
- halves[i].pollfd = &pollfds[i];
- halves[i].rxbuf = NULL;
- halves[i].backoff_deadline = 0;
- halves[i].backoff = 1;
- reconnect(&halves[i]);
+ daemonize();
+
+ /* Connect to datapath. */
+ local_rconn = rconn_create(1, 0, s.max_backoff);
+ rconn_connect(local_rconn, s.nl_name);
+
+ /* Connect to controller. */
+ remote_rconn = rconn_create(1, s.probe_interval, s.max_backoff);
+ if (s.controller_name) {
+ retval = rconn_connect(remote_rconn, s.controller_name);
+ if (retval == EAFNOSUPPORT) {
+ fatal(0, "No support for %s vconn", s.controller_name);
+ }
}
+
+ /* Start relaying. */
+ controller_relay = relay_create(local_rconn, remote_rconn, false);
+ list_push_back(&relays, &controller_relay->node);
+
+ /* Set up hooks. */
+ n_hooks = 0;
+ if (s.in_band) {
+ hooks[n_hooks++] = in_band_hook_create(&s);
+ }
+ if (s.fail_mode == FAIL_OPEN) {
+ hooks[n_hooks++] = fail_open_hook_create(&s,
+ local_rconn, remote_rconn);
+ }
+ assert(n_hooks <= ARRAY_SIZE(hooks));
+
for (;;) {
- /* Wait until there's something to do. */
- for (i = 0; i < 2; i++) {
- struct half *this = &halves[i];
- struct half *peer = &halves[!i];
- int want = 0;
- if (peer->rxbuf) {
- want |= WANT_SEND;
- }
- if (!this->rxbuf) {
- want |= WANT_RECV;
+ struct relay *r, *n;
+ size_t i;
+
+ /* Do work. */
+ LIST_FOR_EACH_SAFE (r, n, struct relay, node, &relays) {
+ relay_run(r, hooks, n_hooks);
+ }
+ if (listen_vconn) {
+ for (;;) {
+ struct relay *r = relay_accept(&s, listen_vconn);
+ if (!r) {
+ break;
+ }
+ list_push_back(&relays, &r->node);
}
- this->pollfd->fd = -1;
- this->pollfd->events = 0;
- vconn_prepoll(this->vconn, want, this->pollfd);
}
- if (vlog_server) {
- pollfds[2].fd = vlog_server_get_fd(vlog_server);
- pollfds[2].events = POLLIN;
+ for (i = 0; i < n_hooks; i++) {
+ if (hooks[i].periodic_cb) {
+ hooks[i].periodic_cb(hooks[i].aux);
+ }
}
- do {
- retval = poll(pollfds, 2 + (vlog_server != NULL), -1);
- } while (retval < 0 && errno == EINTR);
- if (retval <= 0) {
- fatal(retval < 0 ? errno : 0, "poll");
+ if (s.discovery) {
+ char *controller_name;
+ if (rconn_is_connectivity_questionable(remote_rconn)) {
+ discovery_question_connectivity(discovery);
+ }
+ if (discovery_run(discovery, &controller_name)) {
+ if (controller_name) {
+ rconn_connect(remote_rconn, controller_name);
+ } else {
+ rconn_disconnect(remote_rconn);
+ }
+ }
}
- /* Let each connection deal with any pending operations. */
- for (i = 0; i < 2; i++) {
- struct half *this = &halves[i];
- vconn_postpoll(this->vconn, &this->pollfd->revents);
- if (this->pollfd->revents & POLLERR) {
- this->pollfd->revents |= POLLIN | POLLOUT;
- }
+ /* Wait for something to happen. */
+ LIST_FOR_EACH (r, struct relay, node, &relays) {
+ relay_wait(r);
+ }
+ if (listen_vconn) {
+ vconn_accept_wait(listen_vconn);
+ }
+ if (discovery) {
+ discovery_wait(discovery);
}
- if (vlog_server && pollfds[2].revents) {
- vlog_server_poll(vlog_server);
+ poll_block();
+ }
+
+ return 0;
+}
+
+static struct hook
+make_hook(bool (*packet_cb)(struct relay *, int half, void *aux),
+ void (*periodic_cb)(void *aux),
+ void *aux)
+{
+ struct hook h;
+ h.packet_cb = packet_cb;
+ h.periodic_cb = periodic_cb;
+ h.aux = aux;
+ return h;
+}
+\f
+/* OpenFlow message relaying. */
+
+static struct relay *
+relay_accept(const struct settings *s, struct vconn *listen_vconn)
+{
+ struct vconn *new_remote, *new_local;
+ char *nl_name_without_subscription;
+ struct rconn *r1, *r2;
+ int retval;
+
+ retval = vconn_accept(listen_vconn, &new_remote);
+ if (retval) {
+ if (retval != EAGAIN) {
+ VLOG_WARN("accept failed (%s)", strerror(retval));
}
+ return NULL;
+ }
+
+ /* nl:123 or nl:123:1 opens a netlink connection to local datapath 123. We
+ * only accept the former syntax in main().
+ *
+ * nl:123:0 opens a netlink connection to local datapath 123 without
+ * obtaining a subscription for ofp_packet_in or ofp_flow_expired
+ * messages.*/
+ nl_name_without_subscription = xasprintf("%s:0", s->nl_name);
+ retval = vconn_open(nl_name_without_subscription, &new_local);
+ if (retval) {
+ VLOG_ERR("could not connect to %s (%s)",
+ nl_name_without_subscription, strerror(retval));
+ vconn_close(new_remote);
+ free(nl_name_without_subscription);
+ return NULL;
+ }
+
+ /* Create and return relay. */
+ r1 = rconn_create(1, 0, 0);
+ rconn_connect_unreliably(r1, nl_name_without_subscription, new_local);
+ free(nl_name_without_subscription);
+
+ r2 = rconn_create(1, 0, 0);
+ rconn_connect_unreliably(r2, "passive", new_remote);
+
+ return relay_create(r1, r2, true);
+}
+
+static struct relay *
+relay_create(struct rconn *local, struct rconn *remote, bool is_mgmt_conn)
+{
+ struct relay *r;
+ int i;
+
+ r = xmalloc(sizeof *r);
+ r->halves[HALF_LOCAL].rconn = local;
+ r->halves[HALF_REMOTE].rconn = remote;
+ for (i = 0; i < 2; i++) {
+ r->halves[i].rxbuf = NULL;
+ }
+ r->is_mgmt_conn = is_mgmt_conn;
+ return r;
+}
- /* Do as much work as we can without waiting. */
+static void
+relay_run(struct relay *r, const struct hook hooks[], size_t n_hooks)
+{
+ int iteration;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ rconn_run(r->halves[i].rconn);
+ }
+
+ /* Limit the number of iterations to prevent other tasks from starving. */
+ for (iteration = 0; iteration < 50; iteration++) {
+ bool progress = false;
for (i = 0; i < 2; i++) {
- struct half *this = &halves[i];
- struct half *peer = &halves[!i];
-
- if (this->pollfd->revents & POLLIN && !this->rxbuf) {
- retval = vconn_recv(this->vconn, &this->rxbuf);
- if (retval && retval != EAGAIN) {
- VLOG_DBG("%s: recv: closing connection: %s",
- this->name, strerror(retval));
- reconnect(this);
- break;
+ struct half *this = &r->halves[i];
+ struct half *peer = &r->halves[!i];
+
+ if (!this->rxbuf) {
+ this->rxbuf = rconn_recv(this->rconn);
+ if (this->rxbuf) {
+ const struct hook *h;
+ for (h = hooks; h < &hooks[n_hooks]; h++) {
+ if (h->packet_cb(r, i, h->aux)) {
+ buffer_delete(this->rxbuf);
+ this->rxbuf = NULL;
+ progress = true;
+ break;
+ }
+ }
}
}
- if (peer->pollfd->revents & POLLOUT && this->rxbuf) {
- retval = vconn_send(peer->vconn, this->rxbuf);
- if (!retval) {
+ if (this->rxbuf) {
+ int retval = rconn_send(peer->rconn, this->rxbuf);
+ if (retval != EAGAIN) {
+ if (!retval) {
+ progress = true;
+ } else {
+ buffer_delete(this->rxbuf);
+ }
this->rxbuf = NULL;
- } else if (retval != EAGAIN) {
- VLOG_DBG("%s: send: closing connection: %s",
- peer->name, strerror(retval));
- reconnect(peer);
- break;
}
- }
+ }
+ }
+ if (!progress) {
+ break;
}
}
- return 0;
+ 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;
+ }
+ }
+ }
}
static void
-reconnect(struct half *this)
+relay_wait(struct relay *r)
{
- if (this->vconn != NULL) {
- if (!reliable) {
- fatal(0, "%s: connection dropped", this->name);
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ struct half *this = &r->halves[i];
+
+ rconn_run_wait(this->rconn);
+ if (!this->rxbuf) {
+ rconn_recv_wait(this->rconn);
}
+ }
+}
+
+static void
+relay_destroy(struct relay *r)
+{
+ int i;
- VLOG_WARN("%s: connection dropped, reconnecting", this->name);
- vconn_close(this->vconn);
- this->vconn = NULL;
+ list_remove(&r->node);
+ for (i = 0; i < 2; i++) {
+ struct half *this = &r->halves[i];
+ rconn_destroy(this->rconn);
buffer_delete(this->rxbuf);
- this->rxbuf = NULL;
}
- this->pollfd->revents = POLLIN | POLLOUT;
+ free(r);
+}
+\f
+/* In-band control. */
+
+struct in_band_data {
+ const struct settings *s;
+ struct mac_learning *ml;
+ struct netdev *of_device;
+ uint8_t mac[ETH_ADDR_LEN];
+};
- for (;;) {
- time_t now = time(0);
- int retval;
+static void
+queue_tx(struct rconn *rc, struct buffer *b)
+{
+ if (rconn_force_send(rc, b)) {
+ buffer_delete(b);
+ }
+}
- if (now >= this->backoff_deadline) {
- this->backoff = 1;
- } else {
- this->backoff *= 2;
- if (this->backoff > 60) {
- this->backoff = 60;
+static const uint8_t *
+get_controller_mac(struct netdev *netdev, 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_now();
+
+ 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(netdev, ip, mac);
+ if (retval) {
+ VLOG_DBG("cannot look up controller hw address ("IP_FMT"): %s",
+ IP_ARGS(&ip), strerror(retval));
}
- VLOG_WARN("%s: waiting %d seconds before reconnect\n",
- this->name, (int) (this->backoff_deadline - now));
- sleep(this->backoff_deadline - now);
}
+ have_mac = !eth_addr_is_zero(mac);
- retval = vconn_open(this->name, &this->vconn);
- if (!retval) {
- VLOG_WARN("%s: connected", this->name);
- if (vconn_is_passive(this->vconn)) {
- fatal(0, "%s: passive vconn not supported in control path",
- this->name);
- }
- this->backoff_deadline = now + this->backoff;
- return;
+ /* 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);
}
- if (!reliable) {
- fatal(0, "%s: connection failed", this->name);
+ /* 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) ? mac : NULL;
+}
+
+static bool
+is_controller_mac(const uint8_t mac[ETH_ADDR_LEN],
+ const uint8_t *controller_mac)
+{
+ return controller_mac && eth_addr_equals(mac, controller_mac);
+}
+
+static bool
+in_band_packet_cb(struct relay *r, int half, void *in_band_)
+{
+ struct in_band_data *in_band = in_band_;
+ struct rconn *rc = r->halves[HALF_LOCAL].rconn;
+ struct buffer *msg = r->halves[HALF_LOCAL].rxbuf;
+ struct ofp_packet_in *opi;
+ struct ofp_header *oh;
+ size_t pkt_ofs, pkt_len;
+ struct buffer pkt;
+ struct flow flow;
+ uint16_t in_port, out_port;
+ const uint8_t *controller_mac;
+
+ if (half != HALF_LOCAL || r->is_mgmt_conn) {
+ return false;
+ }
+
+ oh = msg->data;
+ if (oh->type != OFPT_PACKET_IN) {
+ return false;
+ }
+ if (msg->size < offsetof (struct ofp_packet_in, data)) {
+ VLOG_WARN("packet too short (%zu bytes) for packet_in", msg->size);
+ return false;
+ }
+
+ /* Extract flow data from 'opi' into 'flow'. */
+ opi = msg->data;
+ in_port = ntohs(opi->in_port);
+ pkt_ofs = offsetof(struct ofp_packet_in, data);
+ pkt_len = ntohs(opi->header.length) - pkt_ofs;
+ pkt.data = opi->data;
+ pkt.size = pkt_len;
+ flow_extract(&pkt, in_port, &flow);
+
+ /* Deal with local stuff. */
+ controller_mac = get_controller_mac(in_band->of_device,
+ r->halves[HALF_REMOTE].rconn);
+ if (in_port == OFPP_LOCAL) {
+ /* Sent by secure channel. */
+ out_port = mac_learning_lookup(in_band->ml, flow.dl_dst);
+ } else if (eth_addr_equals(flow.dl_dst, in_band->mac)) {
+ /* Sent to secure channel. */
+ out_port = OFPP_LOCAL;
+ if (mac_learning_learn(in_band->ml, flow.dl_src, in_port)) {
+ 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, controller_mac)) {
+ /* ARP sent by controller. */
+ out_port = OFPP_FLOOD;
+ } else if (is_controller_mac(flow.dl_dst, controller_mac)
+ && in_port == mac_learning_lookup(in_band->ml,
+ controller_mac)) {
+ /* Drop controller traffic that arrives on the controller port. */
+ queue_tx(rc, make_add_flow(&flow, ntohl(opi->buffer_id),
+ in_band->s->max_idle, 0));
+ return true;
+ } else {
+ return false;
+ }
+
+ if (out_port != OFPP_FLOOD) {
+ /* The output port is known, so add a new flow. */
+ queue_tx(rc, make_add_simple_flow(&flow, ntohl(opi->buffer_id),
+ out_port, in_band->s->max_idle));
+
+ /* 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;
+}
+
+static struct hook
+in_band_hook_create(const struct settings *s)
+{
+ struct in_band_data *in_band;
+ int retval;
+
+ in_band = xmalloc(sizeof *in_band);
+ in_band->s = s;
+ in_band->ml = mac_learning_create();
+ retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE,
+ &in_band->of_device);
+ if (retval) {
+ fatal(retval, "Could not open %s device", s->of_name);
+ }
+ memcpy(in_band->mac, netdev_get_etheraddr(in_band->of_device),
+ ETH_ADDR_LEN);
+
+ return make_hook(in_band_packet_cb, NULL, in_band);
+}
+\f
+/* Fail open support. */
+
+struct fail_open_data {
+ const struct settings *s;
+ struct rconn *local_rconn;
+ struct rconn *remote_rconn;
+ struct lswitch *lswitch;
+ int last_disconn_secs;
+};
+
+/* Causes 'r' to enter or leave fail-open mode, if appropriate. */
+static void
+fail_open_periodic_cb(void *fail_open_)
+{
+ struct fail_open_data *fail_open = fail_open_;
+ int disconn_secs;
+ bool open;
+
+ disconn_secs = rconn_disconnected_duration(fail_open->remote_rconn);
+ open = disconn_secs >= fail_open->s->probe_interval * 3;
+ if (open != (fail_open->lswitch != NULL)) {
+ if (!open) {
+ VLOG_WARN("No longer in fail-open mode");
+ lswitch_destroy(fail_open->lswitch);
+ fail_open->lswitch = NULL;
+ } else {
+ VLOG_WARN("Could not connect to controller for %d seconds, "
+ "failing open", disconn_secs);
+ fail_open->lswitch = lswitch_create(fail_open->local_rconn, true,
+ fail_open->s->max_idle);
+ fail_open->last_disconn_secs = disconn_secs;
}
- VLOG_WARN("%s: connection failed (%s)", this->name, strerror(errno));
- this->backoff_deadline = time(0) + this->backoff;
+ } else if (open && disconn_secs > fail_open->last_disconn_secs + 60) {
+ VLOG_WARN("Still in fail-open mode after %d seconds disconnected "
+ "from controller", disconn_secs);
+ fail_open->last_disconn_secs = disconn_secs;
+ }
+}
+
+static bool
+fail_open_packet_cb(struct relay *r, int half, void *fail_open_)
+{
+ struct fail_open_data *fail_open = fail_open_;
+ if (half != HALF_LOCAL || r->is_mgmt_conn || !fail_open->lswitch) {
+ return false;
+ } else {
+ lswitch_process_packet(fail_open->lswitch, fail_open->local_rconn,
+ r->halves[HALF_LOCAL].rxbuf);
+ rconn_run(fail_open->local_rconn);
+ return true;
}
}
+static struct hook
+fail_open_hook_create(const struct settings *s, struct rconn *local_rconn,
+ struct rconn *remote_rconn)
+{
+ struct fail_open_data *fail_open = xmalloc(sizeof *fail_open);
+ fail_open->s = s;
+ fail_open->local_rconn = local_rconn;
+ fail_open->remote_rconn = remote_rconn;
+ fail_open->lswitch = NULL;
+ return make_hook(fail_open_packet_cb, fail_open_periodic_cb, fail_open);
+}
+\f
+/* Controller discovery. */
+
+struct discovery
+{
+ const struct settings *s;
+ struct dhclient *dhcp;
+ bool ever_successful;
+};
+
+static struct discovery *
+discovery_init(const struct settings *s)
+{
+ struct netdev *netdev;
+ struct discovery *d;
+ struct dhclient *dhcp;
+ int retval;
+
+ /* Bring ofX network device up. */
+ retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE, &netdev);
+ if (retval) {
+ fatal(retval, "Could not open %s device", s->of_name);
+ }
+ retval = netdev_turn_flags_on(netdev, NETDEV_UP, true);
+ if (retval) {
+ fatal(retval, "Could not bring %s device up", s->of_name);
+ }
+ netdev_close(netdev);
+
+ /* Initialize DHCP client. */
+ retval = dhclient_create(s->of_name, modify_dhcp_request,
+ validate_dhcp_offer, (void *) s, &dhcp);
+ if (retval) {
+ fatal(retval, "Failed to initialize DHCP client");
+ }
+ dhclient_init(dhcp, 0);
+
+ d = xmalloc(sizeof *d);
+ d->s = s;
+ d->dhcp = dhcp;
+ d->ever_successful = false;
+ return d;
+}
+
static void
-parse_options(int argc, char *argv[])
+discovery_question_connectivity(struct discovery *d)
+{
+ dhclient_force_renew(d->dhcp, 15);
+}
+
+static bool
+discovery_run(struct discovery *d, char **controller_name)
{
+ dhclient_run(d->dhcp);
+ if (!dhclient_changed(d->dhcp)) {
+ return false;
+ }
+
+ dhclient_configure_netdev(d->dhcp);
+ if (d->s->update_resolv_conf) {
+ dhclient_update_resolv_conf(d->dhcp);
+ }
+
+ if (dhclient_is_bound(d->dhcp)) {
+ *controller_name = dhcp_msg_get_string(dhclient_get_config(d->dhcp),
+ DHCP_CODE_OFP_CONTROLLER_VCONN);
+ VLOG_WARN("%s: discovered controller", *controller_name);
+ d->ever_successful = true;
+ } else if (controller_name) {
+ *controller_name = NULL;
+ if (d->ever_successful) {
+ VLOG_WARN("discovered controller no longer available");
+ }
+ }
+ return true;
+}
+
+static void
+discovery_wait(struct discovery *d)
+{
+ dhclient_wait(d->dhcp);
+}
+
+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 *s_)
+{
+ const struct settings *s = s_;
+ 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(&s->accept_controller_regex, vconn_name, 0, NULL, 0);
+ if (!accept) {
+ VLOG_WARN("rejecting controller vconn that fails to match %s",
+ s->accept_controller_re);
+ }
+ free(vconn_name);
+ return accept;
+}
+\f
+/* User interface. */
+
+static void
+parse_options(int argc, char *argv[], struct settings *s)
+{
+ enum {
+ OPT_ACCEPT_VCONN = UCHAR_MAX + 1,
+ OPT_NO_RESOLV_CONF,
+ OPT_INACTIVITY_PROBE,
+ OPT_MAX_IDLE,
+ OPT_MAX_BACKOFF
+ };
static struct option long_options[] = {
- {"unreliable", no_argument, 0, 'u'},
+ {"accept-vconn", required_argument, 0, OPT_ACCEPT_VCONN},
+ {"no-resolv-conf", no_argument, 0, OPT_NO_RESOLV_CONF},
+ {"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'},
{"verbose", optional_argument, 0, 'v'},
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
+ VCONN_SSL_LONG_OPTIONS
{0, 0, 0, 0},
};
char *short_options = long_options_to_short_options(long_options);
-
+ char *accept_re = NULL;
+ int retval;
+
+ /* Set defaults that we can figure out before parsing options. */
+ s->listen_vconn_name = NULL;
+ s->fail_mode = FAIL_OPEN;
+ s->max_idle = 15;
+ s->probe_interval = 15;
+ s->max_backoff = 15;
+ s->update_resolv_conf = true;
for (;;) {
- int indexptr;
int c;
- c = getopt_long(argc, argv, short_options, long_options, &indexptr);
+ c = getopt_long(argc, argv, short_options, long_options, NULL);
if (c == -1) {
break;
}
switch (c) {
- case 'u':
- reliable = false;
+ case OPT_ACCEPT_VCONN:
+ accept_re = optarg[0] == '^' ? optarg : xasprintf("^%s", optarg);
+ break;
+
+ case OPT_NO_RESOLV_CONF:
+ s->update_resolv_conf = false;
+ break;
+
+ case 'f':
+ if (!strcmp(optarg, "open")) {
+ s->fail_mode = FAIL_OPEN;
+ } else if (!strcmp(optarg, "closed")) {
+ s->fail_mode = FAIL_CLOSED;
+ } else {
+ fatal(0,
+ "-f or --fail argument must be \"open\" or \"closed\"");
+ }
+ break;
+
+ case OPT_INACTIVITY_PROBE:
+ s->probe_interval = atoi(optarg);
+ if (s->probe_interval < 5) {
+ fatal(0, "--inactivity-probe argument must be at least 5");
+ }
+ break;
+
+ case OPT_MAX_IDLE:
+ if (!strcmp(optarg, "permanent")) {
+ s->max_idle = OFP_FLOW_PERMANENT;
+ } else {
+ s->max_idle = atoi(optarg);
+ if (s->max_idle < 1 || s->max_idle > 65535) {
+ fatal(0, "--max-idle argument must be between 1 and "
+ "65535 or the word 'permanent'");
+ }
+ }
+ break;
+
+ case OPT_MAX_BACKOFF:
+ s->max_backoff = atoi(optarg);
+ if (s->max_backoff < 1) {
+ fatal(0, "--max-backoff argument must be at least 1");
+ } else if (s->max_backoff > 3600) {
+ s->max_backoff = 3600;
+ }
+ break;
+
+ case 'D':
+ set_detach();
+ break;
+
+ case 'P':
+ set_pidfile(optarg);
+ break;
+
+ case 'l':
+ if (s->listen_vconn_name) {
+ fatal(0, "-l or --listen may be only specified once");
+ }
+ s->listen_vconn_name = optarg;
break;
case 'h':
vlog_set_verbosity(optarg);
break;
+ VCONN_SSL_OPTION_HANDLERS
+
case '?':
exit(EXIT_FAILURE);
}
}
free(short_options);
+
+ argc -= optind;
+ argv += optind;
+ if (argc < 1 || argc > 2) {
+ fatal(0, "need one or two non-option arguments; use --help for usage");
+ }
+
+ /* Local and remote vconns. */
+ s->nl_name = argv[0];
+ if (strncmp(s->nl_name, "nl:", 3)
+ || strlen(s->nl_name) < 4
+ || s->nl_name[strspn(s->nl_name + 3, "0123456789") + 3]) {
+ fatal(0, "%s: argument is not of the form \"nl:DP_IDX\"", s->nl_name);
+ }
+ s->of_name = xasprintf("of%s", s->nl_name + 3);
+ s->controller_name = argc > 1 ? xstrdup(argv[1]) : NULL;
+
+ /* Set accept_controller_regex. */
+ if (!accept_re) {
+ accept_re = vconn_ssl_is_configured() ? "^ssl:.*" : ".*";
+ }
+ retval = regcomp(&s->accept_controller_regex, accept_re,
+ REG_NOSUB | REG_EXTENDED);
+ if (retval) {
+ size_t length = regerror(retval, &s->accept_controller_regex, NULL, 0);
+ char *buffer = xmalloc(length);
+ regerror(retval, &s->accept_controller_regex, buffer, length);
+ fatal(0, "%s: %s", accept_re, buffer);
+ }
+ s->accept_controller_re = accept_re;
+
+ /* Mode of operation. */
+ s->discovery = s->controller_name == NULL;
+ if (s->discovery) {
+ s->in_band = true;
+ } else {
+ enum netdev_flags flags;
+ struct netdev *netdev;
+
+ retval = netdev_open(s->of_name, NETDEV_ETH_TYPE_NONE, &netdev);
+ if (retval) {
+ fatal(retval, "Could not open %s device", s->of_name);
+ }
+
+ retval = netdev_get_flags(netdev, &flags);
+ if (retval) {
+ fatal(retval, "Could not get flags for %s device", s->of_name);
+ }
+
+ s->in_band = (flags & NETDEV_UP) != 0;
+ if (s->in_band && netdev_get_in6(netdev, NULL)) {
+ VLOG_WARN("Ignoring IPv6 address on %s device: IPv6 not supported",
+ s->of_name);
+ }
+
+ netdev_close(netdev);
+ }
}
static void
usage(void)
{
- printf("%s: Secure Channel\n"
- "usage: %s [OPTIONS] nl:DP_ID tcp:HOST:[PORT]\n"
- "\nConnects to local datapath DP_ID via Netlink and \n"
- "controller on HOST via TCP to PORT (default: %d).\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"
+ "CONTROLLER is an active OpenFlow connection method; if it is\n"
+ "omitted, then secchan performs controller discovery.\n",
+ program_name, program_name);
+ vconn_usage(true, true);
+ printf("\nController discovery options:\n"
+ " --accept-vconn=REGEX accept matching discovered controllers\n"
+ " --no-resolv-conf do not update /etc/resolv.conf\n"
"\nNetworking options:\n"
- " -u, --unreliable do not reconnect after connections drop\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]] set logging levels\n"
" -v, --verbose set maximum verbosity level\n"
" -h, --help display this help message\n"
" -V, --version display version information\n",
- program_name, program_name, OFP_TCP_PORT);
+ RUNDIR);
exit(EXIT_SUCCESS);
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff