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https://github.com/openvswitch/ovs
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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>
398 lines
11 KiB
C
398 lines
11 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2016 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 <errno.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "fatal-signal.h"
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#include "openvswitch/ofpbuf.h"
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#include "openflow/openflow.h"
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#include "openvswitch/poll-loop.h"
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#include "socket-util.h"
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#include "stream.h"
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#include "util.h"
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#include "vconn-provider.h"
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#include "openvswitch/vconn.h"
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#include "openvswitch/vlog.h"
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VLOG_DEFINE_THIS_MODULE(vconn_stream);
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/* Active stream socket vconn. */
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struct vconn_stream
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{
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struct vconn vconn;
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struct stream *stream;
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struct ofpbuf *rxbuf;
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struct ofpbuf *txbuf;
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int n_packets;
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};
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static const struct vconn_class stream_vconn_class;
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
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static void vconn_stream_clear_txbuf(struct vconn_stream *);
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static struct vconn *
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vconn_stream_new(struct stream *stream, int connect_status,
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uint32_t allowed_versions)
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{
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struct vconn_stream *s;
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s = xmalloc(sizeof *s);
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vconn_init(&s->vconn, &stream_vconn_class, connect_status,
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stream_get_name(stream), allowed_versions);
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s->stream = stream;
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s->txbuf = NULL;
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s->rxbuf = NULL;
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s->n_packets = 0;
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return &s->vconn;
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}
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/* Creates a new vconn that will send and receive data on a stream named 'name'
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* and stores a pointer to the vconn in '*vconnp'.
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*
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* Returns 0 if successful, otherwise a positive errno value. */
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static int
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vconn_stream_open(const char *name, uint32_t allowed_versions,
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char *suffix OVS_UNUSED, struct vconn **vconnp, uint8_t dscp)
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{
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struct stream *stream;
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int error;
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error = stream_open_with_default_port(name, OFP_PORT, &stream, dscp);
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if (!error) {
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error = stream_connect(stream);
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if (!error || error == EAGAIN) {
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*vconnp = vconn_stream_new(stream, error, allowed_versions);
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return 0;
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}
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}
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stream_close(stream);
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return error;
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}
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static struct vconn_stream *
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vconn_stream_cast(struct vconn *vconn)
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{
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return CONTAINER_OF(vconn, struct vconn_stream, vconn);
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}
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static void
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vconn_stream_close(struct vconn *vconn)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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if ((vconn->error == EPROTO || s->n_packets < 1) && s->rxbuf) {
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stream_report_content(s->rxbuf->data, s->rxbuf->size, STREAM_OPENFLOW,
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&this_module, vconn_get_name(vconn));
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}
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stream_close(s->stream);
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vconn_stream_clear_txbuf(s);
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ofpbuf_delete(s->rxbuf);
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free(s);
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}
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static int
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vconn_stream_connect(struct vconn *vconn)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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return stream_connect(s->stream);
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}
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static int
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vconn_stream_recv__(struct vconn_stream *s, int rx_len)
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{
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struct ofpbuf *rx = s->rxbuf;
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int want_bytes, retval;
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want_bytes = rx_len - rx->size;
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ofpbuf_prealloc_tailroom(rx, want_bytes);
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retval = stream_recv(s->stream, ofpbuf_tail(rx), want_bytes);
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if (retval > 0) {
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rx->size += retval;
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return retval == want_bytes ? 0 : EAGAIN;
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} else if (retval == 0) {
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if (rx->size) {
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VLOG_ERR_RL(&rl, "connection dropped mid-packet");
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return EPROTO;
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}
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return EOF;
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} else {
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return -retval;
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}
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}
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static int
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vconn_stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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const struct ofp_header *oh;
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int rx_len;
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/* Allocate new receive buffer if we don't have one. */
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if (s->rxbuf == NULL) {
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s->rxbuf = ofpbuf_new(1564);
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}
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/* Read ofp_header. */
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if (s->rxbuf->size < sizeof(struct ofp_header)) {
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int retval = vconn_stream_recv__(s, sizeof(struct ofp_header));
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if (retval) {
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return retval;
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}
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}
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/* Read payload. */
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oh = s->rxbuf->data;
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rx_len = ntohs(oh->length);
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if (rx_len < sizeof(struct ofp_header)) {
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VLOG_ERR_RL(&rl, "received too-short ofp_header (%d bytes)", rx_len);
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return EPROTO;
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} else if (s->rxbuf->size < rx_len) {
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int retval = vconn_stream_recv__(s, rx_len);
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if (retval) {
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return retval;
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}
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}
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s->n_packets++;
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*bufferp = s->rxbuf;
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s->rxbuf = NULL;
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return 0;
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}
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static void
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vconn_stream_clear_txbuf(struct vconn_stream *s)
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{
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ofpbuf_delete(s->txbuf);
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s->txbuf = NULL;
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}
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static int
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vconn_stream_send(struct vconn *vconn, struct ofpbuf *buffer)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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ssize_t retval;
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if (s->txbuf) {
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return EAGAIN;
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}
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retval = stream_send(s->stream, buffer->data, buffer->size);
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if (retval == buffer->size) {
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ofpbuf_delete(buffer);
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return 0;
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} else if (retval >= 0 || retval == -EAGAIN) {
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s->txbuf = buffer;
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if (retval > 0) {
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ofpbuf_pull(buffer, retval);
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}
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return 0;
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} else {
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return -retval;
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}
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}
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static void
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vconn_stream_run(struct vconn *vconn)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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ssize_t retval;
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stream_run(s->stream);
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if (!s->txbuf) {
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return;
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}
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retval = stream_send(s->stream, s->txbuf->data, s->txbuf->size);
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if (retval < 0) {
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if (retval != -EAGAIN) {
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VLOG_ERR_RL(&rl, "send: %s", ovs_strerror(-retval));
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vconn_stream_clear_txbuf(s);
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return;
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}
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} else if (retval > 0) {
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ofpbuf_pull(s->txbuf, retval);
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if (!s->txbuf->size) {
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vconn_stream_clear_txbuf(s);
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return;
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}
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}
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}
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static void
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vconn_stream_run_wait(struct vconn *vconn)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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stream_run_wait(s->stream);
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if (s->txbuf) {
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stream_send_wait(s->stream);
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}
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}
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static void
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vconn_stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
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{
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struct vconn_stream *s = vconn_stream_cast(vconn);
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switch (wait) {
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case WAIT_CONNECT:
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stream_connect_wait(s->stream);
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break;
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case WAIT_SEND:
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if (!s->txbuf) {
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stream_send_wait(s->stream);
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} else {
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/* Nothing to do: need to drain txbuf first.
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* vconn_stream_run_wait() will arrange to wake up when there room
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* to send data, so there's no point in calling poll_fd_wait()
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* redundantly here. */
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}
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break;
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case WAIT_RECV:
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stream_recv_wait(s->stream);
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break;
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default:
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OVS_NOT_REACHED();
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}
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}
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/* Passive stream socket vconn. */
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struct pvconn_pstream
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{
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struct pvconn pvconn;
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struct pstream *pstream;
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};
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static const struct pvconn_class pstream_pvconn_class;
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static struct pvconn_pstream *
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pvconn_pstream_cast(struct pvconn *pvconn)
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{
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return CONTAINER_OF(pvconn, struct pvconn_pstream, pvconn);
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}
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/* Creates a new pvconn named 'name' that will accept new connections using
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* pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
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*
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* Returns 0 if successful, otherwise a positive errno value. (The current
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* implementation never fails.) */
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static int
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pvconn_pstream_listen(const char *name, uint32_t allowed_versions,
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char *suffix OVS_UNUSED, struct pvconn **pvconnp,
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uint8_t dscp)
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{
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struct pvconn_pstream *ps;
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struct pstream *pstream;
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int error;
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error = pstream_open_with_default_port(name, OFP_PORT, &pstream, dscp);
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if (error) {
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return error;
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}
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ps = xmalloc(sizeof *ps);
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pvconn_init(&ps->pvconn, &pstream_pvconn_class, name, allowed_versions);
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ps->pstream = pstream;
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*pvconnp = &ps->pvconn;
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return 0;
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}
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static void
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pvconn_pstream_close(struct pvconn *pvconn)
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{
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struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
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pstream_close(ps->pstream);
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free(ps);
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}
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static int
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pvconn_pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
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{
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struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
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struct stream *stream;
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int error;
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error = pstream_accept(ps->pstream, &stream);
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if (error) {
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if (error != EAGAIN) {
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VLOG_DBG_RL(&rl, "%s: accept: %s",
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pstream_get_name(ps->pstream), ovs_strerror(error));
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}
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return error;
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}
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*new_vconnp = vconn_stream_new(stream, 0, pvconn->allowed_versions);
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return 0;
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}
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static void
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pvconn_pstream_wait(struct pvconn *pvconn)
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{
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struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
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pstream_wait(ps->pstream);
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}
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/* Stream-based vconns and pvconns. */
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#define STREAM_INIT(NAME) \
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{ \
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NAME, \
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vconn_stream_open, \
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vconn_stream_close, \
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vconn_stream_connect, \
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vconn_stream_recv, \
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vconn_stream_send, \
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vconn_stream_run, \
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vconn_stream_run_wait, \
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vconn_stream_wait, \
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}
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#define PSTREAM_INIT(NAME) \
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{ \
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NAME, \
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pvconn_pstream_listen, \
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pvconn_pstream_close, \
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pvconn_pstream_accept, \
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pvconn_pstream_wait \
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}
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static const struct vconn_class stream_vconn_class = STREAM_INIT("stream");
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static const struct pvconn_class pstream_pvconn_class = PSTREAM_INIT("pstream");
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const struct vconn_class tcp_vconn_class = STREAM_INIT("tcp");
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const struct pvconn_class ptcp_pvconn_class = PSTREAM_INIT("ptcp");
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const struct vconn_class unix_vconn_class = STREAM_INIT("unix");
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const struct pvconn_class punix_pvconn_class = PSTREAM_INIT("punix");
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#ifdef HAVE_OPENSSL
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const struct vconn_class ssl_vconn_class = STREAM_INIT("ssl");
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const struct pvconn_class pssl_pvconn_class = PSTREAM_INIT("pssl");
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#endif
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