mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 09:58:01 +00:00
2be393edd3
OpenFlow 1.0 is limited to displaying 1364 ports in the Features Reply message, and there is no other way to get consolidated port information. OpenFlow 1.3 adds a new port description multipart message (OFPMP_PORT_DESC) that is not limited by size. This commit adds support through the OpenFlow 1.0 stats mechanism, since they have complimentary enum values. Bug #11040 Signed-off-by: Justin Pettit <jpettit@nicira.com>
545 lines
17 KiB
C
545 lines
17 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
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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 "byte-order.h"
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#include "classifier.h"
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#include "flow.h"
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#include "hmap.h"
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#include "mac-learning.h"
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#include "ofpbuf.h"
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#include "ofp-errors.h"
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#include "ofp-parse.h"
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#include "ofp-print.h"
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#include "ofp-util.h"
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#include "openflow/openflow.h"
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#include "poll-loop.h"
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#include "rconn.h"
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#include "shash.h"
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#include "timeval.h"
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#include "vconn.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(learning_switch);
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struct lswitch_port {
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struct hmap_node hmap_node; /* Hash node for port number. */
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uint16_t port_no; /* OpenFlow port number, in host byte order. */
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uint32_t queue_id; /* OpenFlow queue number. */
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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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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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struct flow_wildcards wc; /* Wildcards to apply to flows. */
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bool action_normal; /* Use OFPP_NORMAL? */
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/* Queue distribution. */
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uint32_t default_queue; /* Default OpenFlow queue, or UINT32_MAX. */
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struct hmap queue_numbers; /* Map from port number to lswitch_port. */
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struct shash queue_names; /* Map from port name to lswitch_port. */
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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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};
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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 enum ofperr process_switch_features(struct lswitch *,
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struct ofp_switch_features *);
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static void process_packet_in(struct lswitch *, struct rconn *,
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const struct ofp_packet_in *);
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static void process_echo_request(struct lswitch *, struct rconn *,
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const struct ofp_header *);
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/* Creates and returns a new learning switch whose configuration is given by
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* 'cfg'.
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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, const struct lswitch_config *cfg)
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{
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struct lswitch *sw;
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sw = xzalloc(sizeof *sw);
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sw->max_idle = cfg->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 = (cfg->mode == LSW_LEARN
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? mac_learning_create(MAC_ENTRY_DEFAULT_IDLE_TIME)
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: NULL);
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sw->action_normal = cfg->mode == LSW_NORMAL;
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flow_wildcards_init_exact(&sw->wc);
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if (cfg->wildcards) {
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uint32_t ofpfw;
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if (cfg->wildcards == UINT32_MAX) {
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/* Try to wildcard as many fields as possible, but we cannot
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* wildcard all fields. We need in_port to detect moves. We need
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* Ethernet source and dest and VLAN VID to do L2 learning. */
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ofpfw = (OFPFW_DL_TYPE | OFPFW_DL_VLAN_PCP
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| OFPFW_NW_SRC_ALL | OFPFW_NW_DST_ALL
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| OFPFW_NW_TOS | OFPFW_NW_PROTO
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| OFPFW_TP_SRC | OFPFW_TP_DST);
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} else {
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ofpfw = cfg->wildcards;
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}
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ofputil_wildcard_from_openflow(ofpfw, &sw->wc);
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}
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sw->default_queue = cfg->default_queue;
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hmap_init(&sw->queue_numbers);
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shash_init(&sw->queue_names);
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if (cfg->port_queues) {
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struct shash_node *node;
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SHASH_FOR_EACH (node, cfg->port_queues) {
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struct lswitch_port *port = xmalloc(sizeof *port);
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hmap_node_nullify(&port->hmap_node);
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port->queue_id = (uintptr_t) node->data;
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shash_add(&sw->queue_names, node->name, port);
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}
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}
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sw->queued = rconn_packet_counter_create();
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send_features_request(sw, rconn);
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if (cfg->default_flows) {
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enum ofputil_protocol usable_protocols;
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enum ofputil_protocol protocol;
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struct ofpbuf *msg = NULL;
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int ofp_version;
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int error = 0;
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size_t i;
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/* Figure out the initial protocol on the connection. */
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ofp_version = rconn_get_version(rconn);
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protocol = ofputil_protocol_from_ofp_version(ofp_version);
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/* If the initial protocol isn't good enough for default_flows, then
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* pick one that will work and encode messages to set up that
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* protocol.
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*
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* This could be improved by actually negotiating a mutually acceptable
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* flow format with the switch, but that would require an asynchronous
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* state machine. This version ought to work fine in practice. */
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usable_protocols = ofputil_flow_mod_usable_protocols(
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cfg->default_flows, cfg->n_default_flows);
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if (!(protocol & usable_protocols)) {
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enum ofputil_protocol want = rightmost_1bit(usable_protocols);
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while (!error) {
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msg = ofputil_encode_set_protocol(protocol, want, &protocol);
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if (!msg) {
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break;
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}
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error = rconn_send(rconn, msg, NULL);
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}
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}
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for (i = 0; !error && i < cfg->n_default_flows; i++) {
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msg = ofputil_encode_flow_mod(&cfg->default_flows[i], protocol);
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error = rconn_send(rconn, msg, NULL);
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}
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if (error) {
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VLOG_INFO_RL(&rl, "%s: failed to queue default flows (%s)",
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rconn_get_name(rconn), strerror(error));
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}
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}
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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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struct lswitch_port *node, *next;
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HMAP_FOR_EACH_SAFE (node, next, hmap_node, &sw->queue_numbers) {
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hmap_remove(&sw->queue_numbers, &node->hmap_node);
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free(node);
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}
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shash_destroy(&sw->queue_names);
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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)
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{
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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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}
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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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}
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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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const struct ofp_header *oh = msg->data;
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const struct ofputil_msg_type *type;
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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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ofputil_decode_msg_type(oh, &type);
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switch (ofputil_msg_type_code(type)) {
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case OFPUTIL_OFPT_ECHO_REQUEST:
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process_echo_request(sw, rconn, msg->data);
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break;
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case OFPUTIL_OFPT_FEATURES_REPLY:
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process_switch_features(sw, msg->data);
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break;
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case OFPUTIL_OFPT_PACKET_IN:
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process_packet_in(sw, rconn, msg->data);
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break;
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case OFPUTIL_OFPT_FLOW_REMOVED:
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/* Nothing to do. */
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break;
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case OFPUTIL_MSG_INVALID:
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case OFPUTIL_OFPT_HELLO:
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case OFPUTIL_OFPT_ERROR:
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case OFPUTIL_OFPT_ECHO_REPLY:
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case OFPUTIL_OFPT_FEATURES_REQUEST:
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case OFPUTIL_OFPT_GET_CONFIG_REQUEST:
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case OFPUTIL_OFPT_GET_CONFIG_REPLY:
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case OFPUTIL_OFPT_SET_CONFIG:
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case OFPUTIL_OFPT_PORT_STATUS:
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case OFPUTIL_OFPT_PACKET_OUT:
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case OFPUTIL_OFPT_FLOW_MOD:
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case OFPUTIL_OFPT_PORT_MOD:
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case OFPUTIL_OFPT_BARRIER_REQUEST:
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case OFPUTIL_OFPT_BARRIER_REPLY:
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case OFPUTIL_OFPT_QUEUE_GET_CONFIG_REQUEST:
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case OFPUTIL_OFPT_QUEUE_GET_CONFIG_REPLY:
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case OFPUTIL_OFPST_DESC_REQUEST:
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case OFPUTIL_OFPST_FLOW_REQUEST:
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case OFPUTIL_OFPST_AGGREGATE_REQUEST:
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case OFPUTIL_OFPST_TABLE_REQUEST:
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case OFPUTIL_OFPST_PORT_REQUEST:
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case OFPUTIL_OFPST_QUEUE_REQUEST:
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case OFPUTIL_OFPST_PORT_DESC_REQUEST:
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case OFPUTIL_OFPST_DESC_REPLY:
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case OFPUTIL_OFPST_FLOW_REPLY:
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case OFPUTIL_OFPST_QUEUE_REPLY:
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case OFPUTIL_OFPST_PORT_REPLY:
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case OFPUTIL_OFPST_TABLE_REPLY:
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case OFPUTIL_OFPST_AGGREGATE_REPLY:
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case OFPUTIL_OFPST_PORT_DESC_REPLY:
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case OFPUTIL_NXT_ROLE_REQUEST:
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case OFPUTIL_NXT_ROLE_REPLY:
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case OFPUTIL_NXT_FLOW_MOD_TABLE_ID:
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case OFPUTIL_NXT_SET_FLOW_FORMAT:
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case OFPUTIL_NXT_SET_PACKET_IN_FORMAT:
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case OFPUTIL_NXT_PACKET_IN:
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case OFPUTIL_NXT_FLOW_MOD:
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case OFPUTIL_NXT_FLOW_REMOVED:
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case OFPUTIL_NXT_FLOW_AGE:
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case OFPUTIL_NXT_SET_ASYNC_CONFIG:
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case OFPUTIL_NXT_SET_CONTROLLER_ID:
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case OFPUTIL_NXST_FLOW_REQUEST:
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case OFPUTIL_NXST_AGGREGATE_REQUEST:
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case OFPUTIL_NXST_FLOW_REPLY:
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case OFPUTIL_NXST_AGGREGATE_REPLY:
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default:
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if (VLOG_IS_DBG_ENABLED()) {
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char *s = ofp_to_string(msg->data, msg->size, 2);
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VLOG_DBG_RL(&rl, "%016llx: OpenFlow packet ignored: %s",
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sw->datapath_id, s);
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free(s);
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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 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, "%016llx: %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, "%016llx: %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 enum ofperr
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process_switch_features(struct lswitch *sw, struct ofp_switch_features *osf)
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{
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struct ofputil_switch_features features;
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struct ofputil_phy_port port;
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enum ofperr error;
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struct ofpbuf b;
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error = ofputil_decode_switch_features(osf, &features, &b);
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if (error) {
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VLOG_ERR("received invalid switch feature reply (%s)",
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ofperr_to_string(error));
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return error;
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}
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sw->datapath_id = features.datapath_id;
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while (!ofputil_pull_phy_port(osf->header.version, &b, &port)) {
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struct lswitch_port *lp = shash_find_data(&sw->queue_names, port.name);
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if (lp && hmap_node_is_null(&lp->hmap_node)) {
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lp->port_no = port.port_no;
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hmap_insert(&sw->queue_numbers, &lp->hmap_node,
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hash_int(lp->port_no, 0));
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}
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}
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return 0;
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}
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static uint16_t
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lswitch_choose_destination(struct lswitch *sw, const struct flow *flow)
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{
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uint16_t out_port;
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/* Learn the source MAC. */
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if (mac_learning_may_learn(sw->ml, flow->dl_src, 0)) {
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struct mac_entry *mac = mac_learning_insert(sw->ml, flow->dl_src, 0);
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if (mac_entry_is_new(mac) || mac->port.i != flow->in_port) {
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VLOG_DBG_RL(&rl, "%016llx: 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), flow->in_port);
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mac->port.i = flow->in_port;
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mac_learning_changed(sw->ml, mac);
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}
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}
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/* Drop frames for reserved multicast addresses. */
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if (eth_addr_is_reserved(flow->dl_dst)) {
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return OFPP_NONE;
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}
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out_port = OFPP_FLOOD;
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if (sw->ml) {
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struct mac_entry *mac;
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mac = mac_learning_lookup(sw->ml, flow->dl_dst, 0, NULL);
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if (mac) {
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out_port = mac->port.i;
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if (out_port == flow->in_port) {
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/* Don't send a packet back out its input port. */
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return OFPP_NONE;
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}
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}
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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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return OFPP_NORMAL;
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}
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return out_port;
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}
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static uint32_t
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get_queue_id(const struct lswitch *sw, uint16_t in_port)
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{
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const struct lswitch_port *port;
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HMAP_FOR_EACH_WITH_HASH (port, hmap_node, hash_int(in_port, 0),
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&sw->queue_numbers) {
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if (port->port_no == in_port) {
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return port->queue_id;
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}
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}
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return sw->default_queue;
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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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const 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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uint32_t queue_id;
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uint16_t out_port;
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struct ofp_action_header actions[2];
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size_t actions_len;
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struct ofputil_packet_out po;
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size_t pkt_ofs, pkt_len;
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struct ofpbuf pkt;
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struct flow flow;
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/* Ignore packets sent via output to OFPP_CONTROLLER. This library never
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* uses such an action. You never know what experiments might be going on,
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* though, and it seems best not to interfere with them. */
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if (opi->reason != OFPR_NO_MATCH) {
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return;
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}
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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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ofpbuf_use_const(&pkt, opi->data, pkt_len);
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flow_extract(&pkt, 0, 0, in_port, &flow);
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/* Choose output port. */
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out_port = lswitch_choose_destination(sw, &flow);
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/* Make actions. */
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queue_id = get_queue_id(sw, in_port);
|
||
if (out_port == OFPP_NONE) {
|
||
actions_len = 0;
|
||
} else if (queue_id == UINT32_MAX || out_port >= OFPP_MAX) {
|
||
struct ofp_action_output oao;
|
||
|
||
memset(&oao, 0, sizeof oao);
|
||
oao.type = htons(OFPAT10_OUTPUT);
|
||
oao.len = htons(sizeof oao);
|
||
oao.port = htons(out_port);
|
||
|
||
memcpy(actions, &oao, sizeof oao);
|
||
actions_len = sizeof oao;
|
||
} else {
|
||
struct ofp_action_enqueue oae;
|
||
|
||
memset(&oae, 0, sizeof oae);
|
||
oae.type = htons(OFPAT10_ENQUEUE);
|
||
oae.len = htons(sizeof oae);
|
||
oae.port = htons(out_port);
|
||
oae.queue_id = htonl(queue_id);
|
||
|
||
memcpy(actions, &oae, sizeof oae);
|
||
actions_len = sizeof oae;
|
||
}
|
||
assert(actions_len <= sizeof actions);
|
||
|
||
/* Prepare packet_out in case we need one. */
|
||
po.buffer_id = ntohl(opi->buffer_id);
|
||
if (po.buffer_id == UINT32_MAX) {
|
||
po.packet = pkt.data;
|
||
po.packet_len = pkt.size;
|
||
} else {
|
||
po.packet = NULL;
|
||
po.packet_len = 0;
|
||
}
|
||
po.in_port = in_port;
|
||
po.actions = (union ofp_action *) actions;
|
||
po.n_actions = actions_len / sizeof *actions;
|
||
|
||
/* Send the packet, and possibly the whole flow, to the output port. */
|
||
if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
|
||
struct ofpbuf *buffer;
|
||
struct cls_rule rule;
|
||
|
||
/* The output port is known, or we always flood everything, so add a
|
||
* new flow. */
|
||
cls_rule_init(&flow, &sw->wc, 0, &rule);
|
||
buffer = make_add_flow(&rule, ntohl(opi->buffer_id),
|
||
sw->max_idle, actions_len);
|
||
ofpbuf_put(buffer, actions, actions_len);
|
||
queue_tx(sw, rconn, buffer);
|
||
|
||
/* If the switch didn't buffer the packet, we need to send a copy. */
|
||
if (ntohl(opi->buffer_id) == UINT32_MAX && actions_len > 0) {
|
||
queue_tx(sw, rconn, ofputil_encode_packet_out(&po));
|
||
}
|
||
} else {
|
||
/* We don't know that MAC, or we don't set up flows. Send along the
|
||
* packet without setting up a flow. */
|
||
if (ntohl(opi->buffer_id) != UINT32_MAX || actions_len > 0) {
|
||
queue_tx(sw, rconn, ofputil_encode_packet_out(&po));
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
process_echo_request(struct lswitch *sw, struct rconn *rconn,
|
||
const struct ofp_header *rq)
|
||
{
|
||
queue_tx(sw, rconn, make_echo_reply(rq));
|
||
}
|