mirror of
https://github.com/openvswitch/ovs
synced 2025-10-19 14:37:21 +00:00
ca06922988
In OpenFlow 0.9, flow "expiration" messages are sent when flows are explicitly removed by a delete action. As such, the message is renamed from Flow Expired to Flow Removed. This commit adds that support as well as supporting the ability to choose sending these messages on a per flow basis. NOTE: OVS at this point is not wire-compatible with OpenFlow 0.9 until the final commit in this OpenFlow 0.9 set.
680 lines
21 KiB
C
680 lines
21 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 "flow.h"
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#include "mac-learning.h"
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#include "ofpbuf.h"
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#include "ofp-print.h"
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#include "openflow/openflow.h"
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#include "poll-loop.h"
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#include "queue.h"
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#include "rconn.h"
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#include "stp.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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enum port_state {
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P_DISABLED = 1 << 0,
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P_LISTENING = 1 << 1,
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P_LEARNING = 1 << 2,
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P_FORWARDING = 1 << 3,
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P_BLOCKING = 1 << 4
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};
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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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unsigned long long int datapath_id;
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uint32_t capabilities;
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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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bool exact_flows; /* Use exact-match flows? */
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bool action_normal; /* Use OFPP_NORMAL? */
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/* Number of outgoing queued packets on the rconn. */
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struct rconn_packet_counter *queued;
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/* Spanning tree protocol implementation.
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*
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* We implement STP states by, whenever a port's STP state changes,
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* querying all the flows on the switch and then deleting any of them that
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* are inappropriate for a port's STP state. */
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long long int next_query; /* Next time at which to query all flows. */
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long long int last_query; /* Last time we sent a query. */
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long long int last_reply; /* Last time we received a query reply. */
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unsigned int port_states[STP_MAX_PORTS];
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uint32_t query_xid; /* XID used for query. */
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int n_flows, n_no_recv, n_no_send;
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};
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/* The log messages here could actually be useful in debugging, so keep the
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* rate limit relatively high. */
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300);
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static void queue_tx(struct lswitch *, struct rconn *, struct ofpbuf *);
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static void send_features_request(struct lswitch *, struct rconn *);
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static void schedule_query(struct lswitch *, long long int delay);
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static bool may_learn(const struct lswitch *, uint16_t port_no);
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static bool may_recv(const struct lswitch *, uint16_t port_no,
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bool any_actions);
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static bool may_send(const struct lswitch *, uint16_t port_no);
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typedef void packet_handler_func(struct lswitch *, struct rconn *, void *);
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static packet_handler_func process_switch_features;
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static packet_handler_func process_packet_in;
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static packet_handler_func process_echo_request;
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static packet_handler_func process_port_status;
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static packet_handler_func process_phy_port;
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static packet_handler_func process_stats_reply;
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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,
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bool exact_flows, int max_idle, bool action_normal)
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{
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struct lswitch *sw;
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size_t i;
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sw = xzalloc(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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sw->action_normal = action_normal;
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sw->exact_flows = exact_flows;
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sw->queued = rconn_packet_counter_create();
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sw->next_query = LLONG_MIN;
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sw->last_query = LLONG_MIN;
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sw->last_reply = LLONG_MIN;
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for (i = 0; i < STP_MAX_PORTS; i++) {
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sw->port_states[i] = P_DISABLED;
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}
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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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rconn_packet_counter_destroy(sw->queued);
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free(sw);
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}
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}
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/* Takes care of necessary 'sw' activity, except for receiving packets (which
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* the caller must do). */
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void
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lswitch_run(struct lswitch *sw, struct rconn *rconn)
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{
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long long int now = time_msec();
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if (sw->ml) {
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mac_learning_run(sw->ml, NULL);
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}
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/* If we're waiting for more replies, keeping waiting for up to 10 s. */
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if (sw->last_reply != LLONG_MIN) {
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if (now - sw->last_reply > 10000) {
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VLOG_ERR_RL(&rl, "%012llx: No more flow stat replies last 10 s",
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sw->datapath_id);
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sw->last_reply = LLONG_MIN;
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sw->last_query = LLONG_MIN;
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schedule_query(sw, 0);
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} else {
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return;
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}
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}
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/* If we're waiting for any reply at all, keep waiting for up to 10 s. */
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if (sw->last_query != LLONG_MIN) {
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if (now - sw->last_query > 10000) {
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VLOG_ERR_RL(&rl, "%012llx: No flow stat replies in last 10 s",
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sw->datapath_id);
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sw->last_query = LLONG_MIN;
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schedule_query(sw, 0);
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} else {
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return;
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}
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}
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/* If it's time to send another query, do so. */
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if (sw->next_query != LLONG_MIN && now >= sw->next_query) {
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sw->next_query = LLONG_MIN;
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if (!rconn_is_connected(rconn)) {
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schedule_query(sw, 1000);
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} else {
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struct ofp_stats_request *osr;
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struct ofp_flow_stats_request *ofsr;
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struct ofpbuf *b;
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int error;
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VLOG_DBG("%012llx: Sending flow stats request to implement STP",
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sw->datapath_id);
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sw->last_query = now;
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sw->query_xid = random_uint32();
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sw->n_flows = 0;
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sw->n_no_recv = 0;
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sw->n_no_send = 0;
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osr = make_openflow_xid(sizeof *osr + sizeof *ofsr,
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OFPT_STATS_REQUEST, sw->query_xid, &b);
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osr->type = htons(OFPST_FLOW);
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osr->flags = htons(0);
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ofsr = (struct ofp_flow_stats_request *) osr->body;
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ofsr->match.wildcards = htonl(OFPFW_ALL);
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ofsr->table_id = 0xff;
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ofsr->out_port = htons(OFPP_NONE);
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error = rconn_send(rconn, b, NULL);
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if (error) {
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VLOG_WARN_RL(&rl, "%012llx: sending flow stats request "
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"failed: %s", sw->datapath_id, strerror(error));
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ofpbuf_delete(b);
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schedule_query(sw, 1000);
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}
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}
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}
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}
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static void
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wait_timeout(long long int started)
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{
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long long int now = time_msec();
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long long int timeout = 10000 - (now - started);
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if (timeout <= 0) {
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poll_immediate_wake();
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} else {
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poll_timer_wait(timeout);
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}
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}
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void
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lswitch_wait(struct lswitch *sw)
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{
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if (sw->ml) {
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mac_learning_wait(sw->ml);
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}
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if (sw->last_reply != LLONG_MIN) {
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wait_timeout(sw->last_reply);
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} else if (sw->last_query != LLONG_MIN) {
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wait_timeout(sw->last_query);
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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 ofpbuf *msg)
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{
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struct processor {
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uint8_t type;
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size_t min_size;
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packet_handler_func *handler;
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};
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static const struct processor processors[] = {
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{
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OFPT_ECHO_REQUEST,
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sizeof(struct ofp_header),
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process_echo_request
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},
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{
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OFPT_FEATURES_REPLY,
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sizeof(struct ofp_switch_features),
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process_switch_features
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},
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{
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OFPT_PACKET_IN,
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offsetof(struct ofp_packet_in, data),
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process_packet_in
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},
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{
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OFPT_PORT_STATUS,
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sizeof(struct ofp_port_status),
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process_port_status
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},
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{
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OFPT_STATS_REPLY,
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offsetof(struct ofp_stats_reply, body),
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process_stats_reply
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},
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{
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OFPT_FLOW_REMOVED,
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sizeof(struct ofp_flow_removed),
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NULL
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},
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};
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const size_t n_processors = ARRAY_SIZE(processors);
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const struct processor *p;
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struct ofp_header *oh;
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oh = msg->data;
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if (sw->datapath_id == 0
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&& oh->type != OFPT_ECHO_REQUEST
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&& oh->type != OFPT_FEATURES_REPLY) {
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send_features_request(sw, rconn);
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return;
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}
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for (p = processors; p < &processors[n_processors]; p++) {
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if (oh->type == p->type) {
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if (msg->size < p->min_size) {
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VLOG_WARN_RL(&rl, "%012llx: %s: too short (%zu bytes) for "
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"type %"PRIu8" (min %zu)", sw->datapath_id,
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rconn_get_name(rconn), msg->size, oh->type,
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p->min_size);
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return;
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}
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if (p->handler) {
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(p->handler)(sw, rconn, msg->data);
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}
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return;
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}
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}
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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_RL(&rl, "%012llx: OpenFlow packet ignored: %s",
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sw->datapath_id, p);
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free(p);
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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 ofpbuf *b;
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struct ofp_switch_config *osc;
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/* Send OFPT_FEATURES_REQUEST. */
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make_openflow(sizeof(struct ofp_header), OFPT_FEATURES_REQUEST, &b);
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queue_tx(sw, rconn, b);
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/* Send OFPT_SET_CONFIG. */
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osc = make_openflow(sizeof *osc, OFPT_SET_CONFIG, &b);
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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 ofpbuf *b)
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{
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int retval = rconn_send_with_limit(rconn, b, sw->queued, 10);
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if (retval && retval != ENOTCONN) {
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if (retval == EAGAIN) {
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VLOG_INFO_RL(&rl, "%012llx: %s: tx queue overflow",
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sw->datapath_id, rconn_get_name(rconn));
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} else {
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VLOG_WARN_RL(&rl, "%012llx: %s: send: %s",
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sw->datapath_id, rconn_get_name(rconn),
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strerror(retval));
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}
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}
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}
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static void
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schedule_query(struct lswitch *sw, long long int delay)
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{
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long long int now = time_msec();
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if (sw->next_query == LLONG_MIN || sw->next_query > now + delay) {
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sw->next_query = now + delay;
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}
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}
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static void
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process_switch_features(struct lswitch *sw, struct rconn *rconn, void *osf_)
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{
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struct ofp_switch_features *osf = osf_;
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size_t n_ports = ((ntohs(osf->header.length)
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- offsetof(struct ofp_switch_features, ports))
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/ sizeof *osf->ports);
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size_t i;
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sw->datapath_id = ntohll(osf->datapath_id);
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sw->capabilities = ntohl(osf->capabilities);
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for (i = 0; i < n_ports; i++) {
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process_phy_port(sw, rconn, &osf->ports[i]);
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}
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if (sw->capabilities & OFPC_STP) {
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schedule_query(sw, 1000);
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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, void *opi_)
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{
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struct ofp_packet_in *opi = opi_;
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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 ofpbuf pkt;
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flow_t 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 (may_learn(sw, in_port) && sw->ml) {
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if (mac_learning_learn(sw->ml, flow.dl_src, 0, in_port)) {
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VLOG_DBG_RL(&rl, "%012llx: learned that "ETH_ADDR_FMT" is on "
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"port %"PRIu16, sw->datapath_id,
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ETH_ADDR_ARGS(flow.dl_src), in_port);
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}
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}
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if (eth_addr_is_reserved(flow.dl_src)) {
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goto drop_it;
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}
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if (!may_recv(sw, in_port, false)) {
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/* STP prevents receiving anything on this port. */
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goto drop_it;
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}
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if (sw->ml) {
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int learned_port = mac_learning_lookup(sw->ml, flow.dl_dst, 0);
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if (learned_port >= 0 && may_send(sw, learned_port)) {
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out_port = learned_port;
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}
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}
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if (in_port == out_port) {
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/* Don't send out packets on their input ports. */
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goto drop_it;
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} else if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
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struct ofpbuf *buffer;
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struct ofp_flow_mod *ofm;
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uint32_t wildcards;
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/* Check if we need to wildcard the flows. */
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if (!sw->exact_flows) {
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/* We can not wildcard all fields.
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* We need in_port to detect moves.
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* We need both SA and DA to do learning. */
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wildcards = (OFPFW_DL_TYPE | OFPFW_NW_SRC_MASK | OFPFW_NW_DST_MASK
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| OFPFW_NW_PROTO | OFPFW_TP_SRC | OFPFW_TP_DST);
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} else {
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/* Exact match */
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wildcards = 0;
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}
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/* Check if we need to use "NORMAL" action. */
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if (sw->action_normal && out_port != OFPP_FLOOD) {
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out_port = OFPP_NORMAL;
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}
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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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buffer = make_add_simple_flow(&flow, ntohl(opi->buffer_id),
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out_port, sw->max_idle);
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ofm = buffer->data;
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ofm->match.wildcards = htonl(wildcards);
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queue_tx(sw, rconn, buffer);
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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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struct ofpbuf *b;
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/* Check if we need to use "NORMAL" action. */
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if (sw->action_normal && out_port != OFPP_FLOOD) {
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out_port = OFPP_NORMAL;
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}
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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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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(sw, rconn, b);
|
||
}
|
||
return;
|
||
|
||
drop_it:
|
||
if (sw->max_idle >= 0) {
|
||
/* Set up a flow to drop packets. */
|
||
queue_tx(sw, rconn, make_add_flow(&flow, ntohl(opi->buffer_id),
|
||
sw->max_idle, 0));
|
||
} else {
|
||
/* Just drop the packet, since we don't set up flows at all.
|
||
* XXX we should send a packet_out with no actions if buffer_id !=
|
||
* UINT32_MAX, to avoid clogging the kernel buffers. */
|
||
}
|
||
return;
|
||
}
|
||
|
||
static void
|
||
process_echo_request(struct lswitch *sw, struct rconn *rconn, void *rq_)
|
||
{
|
||
struct ofp_header *rq = rq_;
|
||
queue_tx(sw, rconn, make_echo_reply(rq));
|
||
}
|
||
|
||
static void
|
||
process_port_status(struct lswitch *sw, struct rconn *rconn, void *ops_)
|
||
{
|
||
struct ofp_port_status *ops = ops_;
|
||
process_phy_port(sw, rconn, &ops->desc);
|
||
}
|
||
|
||
static void
|
||
process_phy_port(struct lswitch *sw, struct rconn *rconn OVS_UNUSED,
|
||
void *opp_)
|
||
{
|
||
const struct ofp_phy_port *opp = opp_;
|
||
uint16_t port_no = ntohs(opp->port_no);
|
||
if (sw->capabilities & OFPC_STP && port_no < STP_MAX_PORTS) {
|
||
uint32_t config = ntohl(opp->config);
|
||
uint32_t state = ntohl(opp->state);
|
||
unsigned int *port_state = &sw->port_states[port_no];
|
||
unsigned int new_port_state;
|
||
|
||
if (!(config & (OFPPC_NO_STP | OFPPC_PORT_DOWN))
|
||
&& !(state & OFPPS_LINK_DOWN))
|
||
{
|
||
switch (state & OFPPS_STP_MASK) {
|
||
case OFPPS_STP_LISTEN:
|
||
new_port_state = P_LISTENING;
|
||
break;
|
||
case OFPPS_STP_LEARN:
|
||
new_port_state = P_LEARNING;
|
||
break;
|
||
case OFPPS_STP_FORWARD:
|
||
new_port_state = P_FORWARDING;
|
||
break;
|
||
case OFPPS_STP_BLOCK:
|
||
new_port_state = P_BLOCKING;
|
||
break;
|
||
default:
|
||
new_port_state = P_DISABLED;
|
||
break;
|
||
}
|
||
} else {
|
||
new_port_state = P_FORWARDING;
|
||
}
|
||
if (*port_state != new_port_state) {
|
||
*port_state = new_port_state;
|
||
schedule_query(sw, 1000);
|
||
}
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
get_port_state(const struct lswitch *sw, uint16_t port_no)
|
||
{
|
||
return (port_no >= STP_MAX_PORTS || !(sw->capabilities & OFPC_STP)
|
||
? P_FORWARDING
|
||
: sw->port_states[port_no]);
|
||
}
|
||
|
||
static bool
|
||
may_learn(const struct lswitch *sw, uint16_t port_no)
|
||
{
|
||
return get_port_state(sw, port_no) & (P_LEARNING | P_FORWARDING);
|
||
}
|
||
|
||
static bool
|
||
may_recv(const struct lswitch *sw, uint16_t port_no, bool any_actions)
|
||
{
|
||
unsigned int state = get_port_state(sw, port_no);
|
||
return !(any_actions
|
||
? state & (P_DISABLED | P_LISTENING | P_BLOCKING)
|
||
: state & (P_DISABLED | P_LISTENING | P_BLOCKING | P_LEARNING));
|
||
}
|
||
|
||
static bool
|
||
may_send(const struct lswitch *sw, uint16_t port_no)
|
||
{
|
||
return get_port_state(sw, port_no) & P_FORWARDING;
|
||
}
|
||
|
||
static void
|
||
process_flow_stats(struct lswitch *sw, struct rconn *rconn,
|
||
const struct ofp_flow_stats *ofs)
|
||
{
|
||
const char *end = (char *) ofs + ntohs(ofs->length);
|
||
bool delete = false;
|
||
|
||
/* Decide to delete the flow if it matches on an STP-disabled physical
|
||
* port. But don't delete it if the flow just drops all received packets,
|
||
* because that's a perfectly reasonable thing to do for disabled physical
|
||
* ports. */
|
||
if (!(ofs->match.wildcards & htonl(OFPFW_IN_PORT))) {
|
||
if (!may_recv(sw, ntohs(ofs->match.in_port),
|
||
end > (char *) ofs->actions)) {
|
||
delete = true;
|
||
sw->n_no_recv++;
|
||
}
|
||
}
|
||
|
||
/* Decide to delete the flow if it forwards to an STP-disabled physical
|
||
* port. */
|
||
if (!delete) {
|
||
const struct ofp_action_header *a;
|
||
size_t len;
|
||
|
||
for (a = ofs->actions; (char *) a < end; a += len / 8) {
|
||
len = ntohs(a->len);
|
||
if (len > end - (char *) a) {
|
||
VLOG_DBG_RL(&rl, "%012llx: action exceeds available space "
|
||
"(%zu > %td)",
|
||
sw->datapath_id, len, end - (char *) a);
|
||
break;
|
||
} else if (len % 8) {
|
||
VLOG_DBG_RL(&rl, "%012llx: action length (%zu) not multiple "
|
||
"of 8 bytes", sw->datapath_id, len);
|
||
break;
|
||
}
|
||
|
||
if (a->type == htons(OFPAT_OUTPUT)) {
|
||
struct ofp_action_output *oao = (struct ofp_action_output *) a;
|
||
if (!may_send(sw, ntohs(oao->port))) {
|
||
delete = true;
|
||
sw->n_no_send++;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Delete the flow. */
|
||
if (delete) {
|
||
struct ofp_flow_mod *ofm;
|
||
struct ofpbuf *b;
|
||
|
||
ofm = make_openflow(offsetof(struct ofp_flow_mod, actions),
|
||
OFPT_FLOW_MOD, &b);
|
||
ofm->match = ofs->match;
|
||
ofm->command = OFPFC_DELETE_STRICT;
|
||
rconn_send(rconn, b, NULL);
|
||
}
|
||
}
|
||
|
||
static void
|
||
process_stats_reply(struct lswitch *sw, struct rconn *rconn, void *osr_)
|
||
{
|
||
struct ofp_stats_reply *osr = osr_;
|
||
struct flow_stats_iterator i;
|
||
const struct ofp_flow_stats *fs;
|
||
|
||
if (sw->last_query == LLONG_MIN
|
||
|| osr->type != htons(OFPST_FLOW)
|
||
|| osr->header.xid != sw->query_xid) {
|
||
return;
|
||
}
|
||
for (fs = flow_stats_first(&i, osr); fs; fs = flow_stats_next(&i)) {
|
||
sw->n_flows++;
|
||
process_flow_stats(sw, rconn, fs);
|
||
}
|
||
if (!(osr->flags & htons(OFPSF_REPLY_MORE))) {
|
||
VLOG_DBG("%012llx: Deleted %d of %d received flows to "
|
||
"implement STP, %d because of no-recv, %d because of "
|
||
"no-send", sw->datapath_id,
|
||
sw->n_no_recv + sw->n_no_send, sw->n_flows,
|
||
sw->n_no_recv, sw->n_no_send);
|
||
sw->last_query = LLONG_MIN;
|
||
sw->last_reply = LLONG_MIN;
|
||
} else {
|
||
sw->last_reply = time_msec();
|
||
}
|
||
}
|
||
|