136 lines
5.3 KiB
C
136 lines
5.3 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef SECCHAN_H
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#define SECCHAN_H 1
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#include <regex.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "list.h"
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#include "packets.h"
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struct secchan;
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/* Behavior when the connection to the controller fails. */
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enum fail_mode {
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FAIL_OPEN, /* Act as learning switch. */
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FAIL_CLOSED /* Drop all packets. */
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};
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/* Maximum number of management connection listeners. */
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#define MAX_MGMT 8
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#define MAX_CONTROLLERS 3
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/* Settings that may be configured by the user. */
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struct settings {
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/* Overall mode of operation. */
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bool discovery; /* Discover the controller automatically? */
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bool in_band; /* Connect to controller in-band? */
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/* Related vconns and network devices. */
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const char *dp_name; /* Local datapath. */
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int num_controllers; /* Number of configured controllers. */
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const char *controller_names[MAX_CONTROLLERS]; /* Controllers (if not discovery mode). */
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const char *listener_names[MAX_MGMT]; /* Listen for mgmt connections. */
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size_t n_listeners; /* Number of mgmt connection listeners. */
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const char *monitor_name; /* Listen for traffic monitor connections. */
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/* Failure behavior. */
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enum fail_mode fail_mode; /* Act as learning switch if no controller? */
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int max_idle; /* Idle time for flows in fail-open mode. */
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int probe_interval; /* # seconds idle before sending echo request. */
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int max_backoff; /* Max # seconds between connection attempts. */
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/* Packet-in rate-limiting. */
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int rate_limit; /* Tokens added to bucket per second. */
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int burst_limit; /* Maximum number token bucket size. */
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/* Discovery behavior. */
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regex_t accept_controller_regex; /* Controller vconns to accept. */
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const char *accept_controller_re; /* String version of regex. */
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bool update_resolv_conf; /* Update /etc/resolv.conf? */
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/* Spanning tree protocol. */
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bool enable_stp;
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/* Emergency flow protection/restoration behavior. */
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bool emerg_flow;
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};
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struct half {
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struct rconn *rconn;
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struct ofpbuf *rxbuf;
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int n_txq; /* No. of packets queued for tx on 'rconn'. */
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};
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struct relay {
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struct list node;
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#define HALF_LOCAL 0
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#define HALF_REMOTE 1
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struct half halves[2];
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/* The secchan has a primary connection (relay) to an OpenFlow controller.
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* This primary connection actually makes two connections to the datapath:
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* one for OpenFlow requests and responses, and one that is only used for
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* receiving asynchronous events such as 'ofp_packet_in' events. This
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* design keeps replies to OpenFlow requests from being dropped by the
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* kernel due to a flooded network device.
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*
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* The secchan may also have any number of secondary "management"
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* connections (relays). These connections do not receive asychronous
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* events and thus have a null 'async_rconn'. */
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bool is_mgmt_conn; /* Is this a management connection? */
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struct rconn *async_rconn; /* For receiving asynchronous events. */
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};
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struct hook_class {
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bool (*local_packet_cb)(struct relay *, void *aux);
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bool (*remote_packet_cb)(struct relay *, void *aux);
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void (*periodic_cb)(void *aux);
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void (*wait_cb)(void *aux);
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void (*closing_cb)(struct relay *, void *aux);
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};
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void add_hook(struct secchan *, const struct hook_class *, void *);
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struct ofp_packet_in *get_ofp_packet_in(struct relay *);
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bool get_ofp_packet_eth_header(struct relay *, struct ofp_packet_in **,
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struct eth_header **);
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void get_ofp_packet_payload(struct ofp_packet_in *, struct ofpbuf *);
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#endif /* secchan.h */
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