Ben Pfaff
903d0940fb
Now it helps clients track the number of in-flight messages, but lets the clients do the limiting themselves. This will come in handy for packet-in rate limiting (in an upcoming commit), in which we want to track in-flight packet-in messages separately from other in-flight messages.
263 lines
9.2 KiB
C
263 lines
9.2 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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#include <config.h>
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#include "learning-switch.h"
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#include <errno.h>
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#include <inttypes.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <time.h>
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#include "buffer.h"
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#include "flow.h"
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#include "mac-learning.h"
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#include "ofp-print.h"
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#include "openflow.h"
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#include "queue.h"
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#include "rconn.h"
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#include "timeval.h"
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#include "vconn.h"
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#include "xtoxll.h"
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#define THIS_MODULE VLM_learning_switch
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#include "vlog.h"
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struct lswitch {
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/* If nonnegative, the switch sets up flows that expire after the given
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* number of seconds (or never expire, if the value is OFP_FLOW_PERMANENT).
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* Otherwise, the switch processes every packet. */
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int max_idle;
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uint64_t datapath_id;
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time_t last_features_request;
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struct mac_learning *ml; /* NULL to act as hub instead of switch. */
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/* Number of outgoing queued packets on the rconn. */
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int n_queued;
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};
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static void queue_tx(struct lswitch *, struct rconn *, struct buffer *);
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static void send_features_request(struct lswitch *, struct rconn *);
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static void process_packet_in(struct lswitch *, struct rconn *,
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struct ofp_packet_in *);
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static void process_echo_request(struct lswitch *, struct rconn *,
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struct ofp_header *);
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/* Creates and returns a new learning switch.
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*
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* If 'learn_macs' is true, the new switch will learn the ports on which MAC
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* addresses appear. Otherwise, the new switch will flood all packets.
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*
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* If 'max_idle' is nonnegative, the new switch will set up flows that expire
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* after the given number of seconds (or never expire, if 'max_idle' is
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* OFP_FLOW_PERMANENT). Otherwise, the new switch will process every packet.
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*
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* 'rconn' is used to send out an OpenFlow features request. */
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struct lswitch *
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lswitch_create(struct rconn *rconn, bool learn_macs, int max_idle)
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{
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struct lswitch *sw = xcalloc(1, sizeof *sw);
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sw->max_idle = max_idle;
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sw->datapath_id = 0;
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sw->last_features_request = time_now() - 1;
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sw->ml = learn_macs ? mac_learning_create() : NULL;
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send_features_request(sw, rconn);
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return sw;
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}
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/* Destroys 'sw'. */
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void
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lswitch_destroy(struct lswitch *sw)
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{
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if (sw) {
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mac_learning_destroy(sw->ml);
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free(sw);
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}
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}
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/* Processes 'msg', which should be an OpenFlow received on 'rconn', according
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* to the learning switch state in 'sw'. The most likely result of processing
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* is that flow-setup and packet-out OpenFlow messages will be sent out on
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* 'rconn'. */
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void
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lswitch_process_packet(struct lswitch *sw, struct rconn *rconn,
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const struct buffer *msg)
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{
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static const size_t min_size[UINT8_MAX + 1] = {
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[0 ... UINT8_MAX] = sizeof (struct ofp_header),
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[OFPT_FEATURES_REPLY] = sizeof (struct ofp_switch_features),
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[OFPT_PACKET_IN] = offsetof (struct ofp_packet_in, data),
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};
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struct ofp_header *oh;
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oh = msg->data;
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if (msg->size < min_size[oh->type]) {
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VLOG_WARN("%s: too short (%zu bytes) for type %"PRIu8" (min %zu)",
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rconn_get_name(rconn),
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msg->size, oh->type, min_size[oh->type]);
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return;
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}
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if (oh->type == OFPT_ECHO_REQUEST) {
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process_echo_request(sw, rconn, msg->data);
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} else if (oh->type == OFPT_FEATURES_REPLY) {
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struct ofp_switch_features *osf = msg->data;
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sw->datapath_id = osf->datapath_id;
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} else if (sw->datapath_id == 0) {
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send_features_request(sw, rconn);
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} else if (oh->type == OFPT_PACKET_IN) {
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process_packet_in(sw, rconn, msg->data);
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} else {
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if (VLOG_IS_DBG_ENABLED()) {
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char *p = ofp_to_string(msg->data, msg->size, 2);
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VLOG_DBG("OpenFlow packet ignored: %s", p);
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free(p);
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}
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}
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}
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static void
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send_features_request(struct lswitch *sw, struct rconn *rconn)
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{
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time_t now = time_now();
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if (now >= sw->last_features_request + 1) {
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struct buffer *b;
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struct ofp_header *ofr;
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struct ofp_switch_config *osc;
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/* Send OFPT_FEATURES_REQUEST. */
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b = buffer_new(0);
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ofr = buffer_put_uninit(b, sizeof *ofr);
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memset(ofr, 0, sizeof *ofr);
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ofr->type = OFPT_FEATURES_REQUEST;
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ofr->version = OFP_VERSION;
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ofr->length = htons(sizeof *ofr);
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queue_tx(sw, rconn, b);
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/* Send OFPT_SET_CONFIG. */
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b = buffer_new(0);
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osc = buffer_put_uninit(b, sizeof *osc);
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memset(osc, 0, sizeof *osc);
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osc->header.type = OFPT_SET_CONFIG;
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osc->header.version = OFP_VERSION;
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osc->header.length = htons(sizeof *osc);
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osc->flags = htons(OFPC_SEND_FLOW_EXP);
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osc->miss_send_len = htons(OFP_DEFAULT_MISS_SEND_LEN);
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queue_tx(sw, rconn, b);
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sw->last_features_request = now;
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}
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}
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static void
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queue_tx(struct lswitch *sw, struct rconn *rconn, struct buffer *b)
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{
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int retval = rconn_send_with_limit(rconn, b, &sw->n_queued, 10);
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if (retval) {
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if (retval == EAGAIN) {
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/* FIXME: ratelimit. */
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VLOG_WARN("%s: tx queue overflow", rconn_get_name(rconn));
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} else if (retval == ENOTCONN) {
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/* Ignore. */
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} else {
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/* FIXME: ratelimit. */
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VLOG_WARN("%s: send: %s", rconn_get_name(rconn), strerror(retval));
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}
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}
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}
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static void
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process_packet_in(struct lswitch *sw, struct rconn *rconn,
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struct ofp_packet_in *opi)
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{
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uint16_t in_port = ntohs(opi->in_port);
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uint16_t out_port = OFPP_FLOOD;
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size_t pkt_ofs, pkt_len;
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struct buffer pkt;
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struct flow flow;
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/* Extract flow data from 'opi' into 'flow'. */
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pkt_ofs = offsetof(struct ofp_packet_in, data);
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pkt_len = ntohs(opi->header.length) - pkt_ofs;
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pkt.data = opi->data;
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pkt.size = pkt_len;
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flow_extract(&pkt, in_port, &flow);
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if (sw->ml) {
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if (mac_learning_learn(sw->ml, flow.dl_src, in_port)) {
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VLOG_DBG("learned that "ETH_ADDR_FMT" is on datapath %"
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PRIx64" port %"PRIu16, ETH_ADDR_ARGS(flow.dl_src),
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ntohll(sw->datapath_id), in_port);
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}
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out_port = mac_learning_lookup(sw->ml, flow.dl_dst);
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}
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if (in_port == out_port) {
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/* The input and output port match. Set up a flow to drop packets. */
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queue_tx(sw, rconn, make_add_flow(&flow, ntohl(opi->buffer_id),
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sw->max_idle, 0));
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} else if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
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/* The output port is known, or we always flood everything, so add a
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* new flow. */
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queue_tx(sw, rconn, make_add_simple_flow(&flow, ntohl(opi->buffer_id),
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out_port, sw->max_idle));
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/* If the switch didn't buffer the packet, we need to send a copy. */
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if (ntohl(opi->buffer_id) == UINT32_MAX) {
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queue_tx(sw, rconn,
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make_unbuffered_packet_out(&pkt, in_port, out_port));
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}
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} else {
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/* We don't know that MAC, or we don't set up flows. Send along the
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* packet without setting up a flow. */
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struct buffer *b;
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if (ntohl(opi->buffer_id) == UINT32_MAX) {
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b = make_unbuffered_packet_out(&pkt, in_port, out_port);
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} else {
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b = make_buffered_packet_out(ntohl(opi->buffer_id),
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in_port, out_port);
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}
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queue_tx(sw, rconn, b);
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}
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}
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static void
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process_echo_request(struct lswitch *sw, struct rconn *rconn,
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struct ofp_header *rq)
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{
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queue_tx(sw, rconn, make_echo_reply(rq));
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}
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