mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 09:58:01 +00:00
fd016ae3fb
Poll-loop is the core to implement main loop. It should be available in libopenvswitch. Signed-off-by: Xiao Liang <shaw.leon@gmail.com> Signed-off-by: Ben Pfaff <blp@ovn.org>
634 lines
20 KiB
C
634 lines
20 KiB
C
/*
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* Copyright (c) 2008-2017 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 "dp-packet.h"
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#include "flow.h"
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#include "openvswitch/hmap.h"
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#include "mac-learning.h"
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#include "openflow/openflow.h"
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#include "openvswitch/ofp-actions.h"
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#include "openvswitch/ofp-errors.h"
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#include "openvswitch/ofp-msgs.h"
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#include "openvswitch/ofp-print.h"
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#include "openvswitch/ofp-util.h"
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#include "openvswitch/ofp-parse.h"
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#include "openvswitch/ofpbuf.h"
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#include "openvswitch/vconn.h"
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#include "openvswitch/vlog.h"
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#include "openvswitch/poll-loop.h"
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#include "openvswitch/rconn.h"
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#include "openvswitch/shash.h"
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#include "simap.h"
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#include "timeval.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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ofp_port_t port_no; /* OpenFlow port number. */
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uint32_t queue_id; /* OpenFlow queue number. */
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};
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enum lswitch_state {
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S_CONNECTING, /* Waiting for connection to complete. */
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S_FEATURES_REPLY, /* Waiting for features reply. */
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S_SWITCHING, /* Switching flows. */
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};
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struct lswitch {
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struct rconn *rconn;
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enum lswitch_state state;
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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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enum ofputil_protocol protocol;
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unsigned long long int datapath_id;
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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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/* If true, do not reply to any messages from the switch (for debugging
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* fail-open mode). */
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bool mute;
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/* Optional "flow mod" requests to send to the switch at connection time,
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* to set up the flow table. */
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const struct ofputil_flow_mod *default_flows;
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size_t n_default_flows;
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enum ofputil_protocol usable_protocols;
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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 ofpbuf *);
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static void send_features_request(struct lswitch *);
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static void lswitch_process_packet(struct lswitch *, const struct ofpbuf *);
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static enum ofperr process_switch_features(struct lswitch *,
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struct ofp_header *);
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static void process_packet_in(struct lswitch *, const struct ofp_header *);
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static void process_echo_request(struct lswitch *, const struct ofp_header *);
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static ofp_port_t get_mac_entry_ofp_port(const struct mac_learning *ml,
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const struct mac_entry *)
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OVS_REQ_RDLOCK(ml->rwlock);
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static void set_mac_entry_ofp_port(struct mac_learning *ml,
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struct mac_entry *, ofp_port_t)
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OVS_REQ_WRLOCK(ml->rwlock);
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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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uint32_t ofpfw;
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sw = xzalloc(sizeof *sw);
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sw->rconn = rconn;
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sw->state = S_CONNECTING;
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sw->max_idle = cfg->max_idle;
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sw->datapath_id = 0;
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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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switch (cfg->wildcards) {
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case 0:
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ofpfw = 0;
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break;
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case 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 = (OFPFW10_DL_TYPE | OFPFW10_DL_VLAN_PCP
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| OFPFW10_NW_SRC_ALL | OFPFW10_NW_DST_ALL
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| OFPFW10_NW_TOS | OFPFW10_NW_PROTO
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| OFPFW10_TP_SRC | OFPFW10_TP_DST);
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break;
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default:
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ofpfw = cfg->wildcards;
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break;
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}
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ofputil_wildcard_from_ofpfw10(ofpfw, &sw->wc);
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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 simap_node *node;
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SIMAP_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 = 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->default_flows = cfg->default_flows;
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sw->n_default_flows = cfg->n_default_flows;
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sw->usable_protocols = cfg->usable_protocols;
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sw->queued = rconn_packet_counter_create();
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return sw;
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}
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static void
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lswitch_handshake(struct lswitch *sw)
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{
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enum ofputil_protocol protocol;
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enum ofp_version version;
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send_features_request(sw);
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version = rconn_get_version(sw->rconn);
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protocol = ofputil_protocol_from_ofp_version(version);
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if (version >= OFP13_VERSION) {
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/* OpenFlow 1.3 and later by default drop packets that miss in the flow
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* table. Set up a flow to send packets to the controller by
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* default. */
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struct ofpact_output output;
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struct ofpbuf *msg;
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int error;
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ofpact_init_OUTPUT(&output);
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output.port = OFPP_CONTROLLER;
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output.max_len = OFP_DEFAULT_MISS_SEND_LEN;
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struct ofputil_flow_mod fm = {
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.match = MATCH_CATCHALL_INITIALIZER,
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.priority = 0,
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.table_id = 0,
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.command = OFPFC_ADD,
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.buffer_id = UINT32_MAX,
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.out_port = OFPP_NONE,
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.out_group = OFPG_ANY,
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.ofpacts = &output.ofpact,
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.ofpacts_len = sizeof output,
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};
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msg = ofputil_encode_flow_mod(&fm, protocol);
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error = rconn_send(sw->rconn, msg, NULL);
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if (error) {
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VLOG_INFO_RL(&rl, "%s: failed to add default flow (%s)",
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rconn_get_name(sw->rconn), ovs_strerror(error));
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}
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}
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if (sw->default_flows) {
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struct ofpbuf *msg = NULL;
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int error = 0;
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size_t i;
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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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if (!(protocol & sw->usable_protocols)) {
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enum ofputil_protocol want = rightmost_1bit(sw->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(sw->rconn, msg, NULL);
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}
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}
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if (protocol & sw->usable_protocols) {
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for (i = 0; !error && i < sw->n_default_flows; i++) {
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msg = ofputil_encode_flow_mod(&sw->default_flows[i], protocol);
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error = rconn_send(sw->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(sw->rconn), ovs_strerror(error));
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}
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} else {
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VLOG_INFO_RL(&rl, "%s: failed to set usable protocol",
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rconn_get_name(sw->rconn));
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}
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}
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sw->protocol = protocol;
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}
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bool
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lswitch_is_alive(const struct lswitch *sw)
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{
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return rconn_is_alive(sw->rconn);
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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;
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rconn_destroy(sw->rconn);
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HMAP_FOR_EACH_POP (node, hmap_node, &sw->queue_numbers) {
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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_unref(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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int i;
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if (sw->ml) {
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ovs_rwlock_wrlock(&sw->ml->rwlock);
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mac_learning_run(sw->ml);
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ovs_rwlock_unlock(&sw->ml->rwlock);
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}
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rconn_run(sw->rconn);
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if (sw->state == S_CONNECTING) {
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if (rconn_get_version(sw->rconn) != -1) {
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lswitch_handshake(sw);
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sw->state = S_FEATURES_REPLY;
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}
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return;
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}
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for (i = 0; i < 50; i++) {
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struct ofpbuf *msg;
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msg = rconn_recv(sw->rconn);
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if (!msg) {
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break;
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}
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if (!sw->mute) {
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lswitch_process_packet(sw, msg);
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}
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ofpbuf_delete(msg);
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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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ovs_rwlock_rdlock(&sw->ml->rwlock);
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mac_learning_wait(sw->ml);
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ovs_rwlock_unlock(&sw->ml->rwlock);
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}
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rconn_run_wait(sw->rconn);
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rconn_recv_wait(sw->rconn);
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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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static void
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lswitch_process_packet(struct lswitch *sw, const struct ofpbuf *msg)
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{
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enum ofptype type;
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struct ofpbuf b;
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b = *msg;
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if (ofptype_pull(&type, &b)) {
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return;
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}
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if (sw->state == S_FEATURES_REPLY
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&& type != OFPTYPE_ECHO_REQUEST
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&& type != OFPTYPE_FEATURES_REPLY) {
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return;
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}
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if (type == OFPTYPE_ECHO_REQUEST) {
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process_echo_request(sw, msg->data);
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} else if (type == OFPTYPE_FEATURES_REPLY) {
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if (sw->state == S_FEATURES_REPLY) {
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if (!process_switch_features(sw, msg->data)) {
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sw->state = S_SWITCHING;
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} else {
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rconn_disconnect(sw->rconn);
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}
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}
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} else if (type == OFPTYPE_PACKET_IN) {
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process_packet_in(sw, msg->data);
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} else if (type == OFPTYPE_FLOW_REMOVED) {
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/* Nothing to do. */
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} else if (VLOG_IS_DBG_ENABLED()) {
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char *s = ofp_to_string(msg->data, msg->size, NULL, 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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static void
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send_features_request(struct lswitch *sw)
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{
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struct ofpbuf *b;
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int ofp_version = rconn_get_version(sw->rconn);
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ovs_assert(ofp_version > 0 && ofp_version < 0xff);
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/* Send OFPT_FEATURES_REQUEST. */
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b = ofpraw_alloc(OFPRAW_OFPT_FEATURES_REQUEST, ofp_version, 0);
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queue_tx(sw, b);
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/* Send OFPT_SET_CONFIG. */
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struct ofputil_switch_config config = {
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.miss_send_len = OFP_DEFAULT_MISS_SEND_LEN
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};
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queue_tx(sw, ofputil_encode_set_config(&config, ofp_version));
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}
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static void
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queue_tx(struct lswitch *sw, struct ofpbuf *b)
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{
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int retval = rconn_send_with_limit(sw->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(sw->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(sw->rconn),
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ovs_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_header *oh)
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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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struct ofpbuf b = ofpbuf_const_initializer(oh, ntohs(oh->length));
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enum ofperr error = ofputil_pull_switch_features(&b, &features);
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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(oh->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_ofp_port(lp->port_no));
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}
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}
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return 0;
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}
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static ofp_port_t
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lswitch_choose_destination(struct lswitch *sw, const struct flow *flow)
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{
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ofp_port_t out_port;
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/* Learn the source MAC. */
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if (sw->ml) {
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ovs_rwlock_wrlock(&sw->ml->rwlock);
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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,
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0);
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if (get_mac_entry_ofp_port(sw->ml, mac)
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!= flow->in_port.ofp_port) {
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VLOG_DBG_RL(&rl, "%016llx: learned that "ETH_ADDR_FMT" is on "
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"port %"PRIu32, sw->datapath_id,
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ETH_ADDR_ARGS(flow->dl_src),
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flow->in_port.ofp_port);
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set_mac_entry_ofp_port(sw->ml, mac, flow->in_port.ofp_port);
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}
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}
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ovs_rwlock_unlock(&sw->ml->rwlock);
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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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ovs_rwlock_rdlock(&sw->ml->rwlock);
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mac = mac_learning_lookup(sw->ml, flow->dl_dst, 0);
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if (mac) {
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out_port = get_mac_entry_ofp_port(sw->ml, mac);
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if (out_port == flow->in_port.ofp_port) {
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/* Don't send a packet back out its input port. */
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ovs_rwlock_unlock(&sw->ml->rwlock);
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return OFPP_NONE;
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}
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}
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ovs_rwlock_unlock(&sw->ml->rwlock);
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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) {
|
||
return OFPP_NORMAL;
|
||
}
|
||
|
||
return out_port;
|
||
}
|
||
|
||
static uint32_t
|
||
get_queue_id(const struct lswitch *sw, ofp_port_t in_port)
|
||
{
|
||
const struct lswitch_port *port;
|
||
|
||
HMAP_FOR_EACH_WITH_HASH (port, hmap_node, hash_ofp_port(in_port),
|
||
&sw->queue_numbers) {
|
||
if (port->port_no == in_port) {
|
||
return port->queue_id;
|
||
}
|
||
}
|
||
|
||
return sw->default_queue;
|
||
}
|
||
|
||
static void
|
||
process_packet_in(struct lswitch *sw, const struct ofp_header *oh)
|
||
{
|
||
struct ofputil_packet_in pi;
|
||
uint32_t buffer_id;
|
||
uint32_t queue_id;
|
||
ofp_port_t out_port;
|
||
|
||
uint64_t ofpacts_stub[64 / 8];
|
||
struct ofpbuf ofpacts;
|
||
|
||
struct ofputil_packet_out po;
|
||
enum ofperr error;
|
||
|
||
struct dp_packet pkt;
|
||
struct flow flow;
|
||
|
||
error = ofputil_decode_packet_in(oh, true, NULL, NULL, &pi, NULL,
|
||
&buffer_id, NULL);
|
||
if (error) {
|
||
VLOG_WARN_RL(&rl, "failed to decode packet-in: %s",
|
||
ofperr_to_string(error));
|
||
return;
|
||
}
|
||
|
||
/* Ignore packets sent via output to OFPP_CONTROLLER. This library never
|
||
* uses such an action. You never know what experiments might be going on,
|
||
* though, and it seems best not to interfere with them. */
|
||
if (pi.reason != OFPR_NO_MATCH) {
|
||
return;
|
||
}
|
||
|
||
/* Extract flow data from 'pi' into 'flow'. */
|
||
dp_packet_use_const(&pkt, pi.packet, pi.packet_len);
|
||
flow_extract(&pkt, &flow);
|
||
flow.in_port.ofp_port = pi.flow_metadata.flow.in_port.ofp_port;
|
||
flow.tunnel.tun_id = pi.flow_metadata.flow.tunnel.tun_id;
|
||
|
||
/* Choose output port. */
|
||
out_port = lswitch_choose_destination(sw, &flow);
|
||
|
||
/* Make actions. */
|
||
queue_id = get_queue_id(sw, pi.flow_metadata.flow.in_port.ofp_port);
|
||
ofpbuf_use_stack(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
|
||
if (out_port == OFPP_NONE) {
|
||
/* No actions. */
|
||
} else if (queue_id == UINT32_MAX
|
||
|| ofp_to_u16(out_port) >= ofp_to_u16(OFPP_MAX)) {
|
||
ofpact_put_OUTPUT(&ofpacts)->port = out_port;
|
||
} else {
|
||
struct ofpact_enqueue *enqueue = ofpact_put_ENQUEUE(&ofpacts);
|
||
enqueue->port = out_port;
|
||
enqueue->queue = queue_id;
|
||
}
|
||
|
||
/* Prepare packet_out in case we need one. */
|
||
po.buffer_id = buffer_id;
|
||
if (buffer_id == UINT32_MAX) {
|
||
po.packet = dp_packet_data(&pkt);
|
||
po.packet_len = dp_packet_size(&pkt);
|
||
} else {
|
||
po.packet = NULL;
|
||
po.packet_len = 0;
|
||
}
|
||
match_set_in_port(&po.flow_metadata,
|
||
pi.flow_metadata.flow.in_port.ofp_port);
|
||
po.ofpacts = ofpacts.data;
|
||
po.ofpacts_len = ofpacts.size;
|
||
|
||
/* Send the packet, and possibly the whole flow, to the output port. */
|
||
if (sw->max_idle >= 0 && (!sw->ml || out_port != OFPP_FLOOD)) {
|
||
/* The output port is known, or we always flood everything, so add a
|
||
* new flow. */
|
||
struct ofputil_flow_mod fm = {
|
||
.priority = 1, /* Must be > 0 because of table-miss flow entry. */
|
||
.table_id = 0xff,
|
||
.command = OFPFC_ADD,
|
||
.idle_timeout = sw->max_idle,
|
||
.buffer_id = buffer_id,
|
||
.out_port = OFPP_NONE,
|
||
.ofpacts = ofpacts.data,
|
||
.ofpacts_len = ofpacts.size,
|
||
};
|
||
match_init(&fm.match, &flow, &sw->wc);
|
||
ofputil_normalize_match_quiet(&fm.match);
|
||
|
||
struct ofpbuf *buffer = ofputil_encode_flow_mod(&fm, sw->protocol);
|
||
|
||
queue_tx(sw, buffer);
|
||
|
||
/* If the switch didn't buffer the packet, we need to send a copy. */
|
||
if (buffer_id == UINT32_MAX && out_port != OFPP_NONE) {
|
||
queue_tx(sw, ofputil_encode_packet_out(&po, sw->protocol));
|
||
}
|
||
} else {
|
||
/* We don't know that MAC, or we don't set up flows. Send along the
|
||
* packet without setting up a flow. */
|
||
if (buffer_id != UINT32_MAX || out_port != OFPP_NONE) {
|
||
queue_tx(sw, ofputil_encode_packet_out(&po, sw->protocol));
|
||
}
|
||
}
|
||
}
|
||
|
||
static void
|
||
process_echo_request(struct lswitch *sw, const struct ofp_header *rq)
|
||
{
|
||
queue_tx(sw, make_echo_reply(rq));
|
||
}
|
||
|
||
static ofp_port_t
|
||
get_mac_entry_ofp_port(const struct mac_learning *ml,
|
||
const struct mac_entry *e)
|
||
OVS_REQ_RDLOCK(ml->rwlock)
|
||
{
|
||
void *port = mac_entry_get_port(ml, e);
|
||
return (OVS_FORCE ofp_port_t) (uintptr_t) port;
|
||
}
|
||
|
||
static void
|
||
set_mac_entry_ofp_port(struct mac_learning *ml,
|
||
struct mac_entry *e, ofp_port_t ofp_port)
|
||
OVS_REQ_WRLOCK(ml->rwlock)
|
||
{
|
||
mac_entry_set_port(ml, e, (void *) (OVS_FORCE uintptr_t) ofp_port);
|
||
}
|