X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=lib%2Fvconn-stream.c;h=2858462bed7ecf49dbabe81d9810213cae89a596;hb=HEAD;hp=b38c568686362b90d18bcf343b299d0c039be0dc;hpb=a5e54d9b6f8002f34cc792df69e6eda68cf95223;p=cascardo%2Fovs.git

diff --git a/lib/vconn-stream.c b/lib/vconn-stream.c
index b38c56868..2858462be 100644
--- a/lib/vconn-stream.c
+++ b/lib/vconn-stream.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2016 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,316 +15,383 @@
  */
 
 #include <config.h>
-#include "vconn-stream.h"
-#include <assert.h>
 #include <errno.h>
 #include <poll.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
 #include <unistd.h>
-#include "leak-checker.h"
+#include "fatal-signal.h"
 #include "ofpbuf.h"
 #include "openflow/openflow.h"
 #include "poll-loop.h"
 #include "socket-util.h"
+#include "stream.h"
 #include "util.h"
 #include "vconn-provider.h"
-#include "vconn.h"
+#include "openvswitch/vconn.h"
+#include "openvswitch/vlog.h"
 
-#include "vlog.h"
-#define THIS_MODULE VLM_vconn_stream
+VLOG_DEFINE_THIS_MODULE(vconn_stream);
 
 /* Active stream socket vconn. */
 
-struct stream_vconn
+struct vconn_stream
 {
     struct vconn vconn;
-    int fd;
+    struct stream *stream;
     struct ofpbuf *rxbuf;
     struct ofpbuf *txbuf;
-    struct poll_waiter *tx_waiter;
+    int n_packets;
 };
 
-static struct vconn_class stream_vconn_class;
+static const struct vconn_class stream_vconn_class;
 
 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
 
-static void stream_clear_txbuf(struct stream_vconn *);
+static void vconn_stream_clear_txbuf(struct vconn_stream *);
 
-int
-new_stream_vconn(const char *name, int fd, int connect_status,
-                 bool reconnectable, struct vconn **vconnp)
+static struct vconn *
+vconn_stream_new(struct stream *stream, int connect_status,
+                 uint32_t allowed_versions)
 {
-    struct stream_vconn *s;
+    struct vconn_stream *s;
 
     s = xmalloc(sizeof *s);
     vconn_init(&s->vconn, &stream_vconn_class, connect_status,
-               name, reconnectable);
-    s->fd = fd;
+               stream_get_name(stream), allowed_versions);
+    s->stream = stream;
     s->txbuf = NULL;
-    s->tx_waiter = NULL;
     s->rxbuf = NULL;
-    *vconnp = &s->vconn;
-    return 0;
+    s->n_packets = 0;
+    return &s->vconn;
+}
+
+/* Creates a new vconn that will send and receive data on a stream named 'name'
+ * and stores a pointer to the vconn in '*vconnp'.
+ *
+ * Returns 0 if successful, otherwise a positive errno value. */
+static int
+vconn_stream_open(const char *name, uint32_t allowed_versions,
+                  char *suffix OVS_UNUSED, struct vconn **vconnp, uint8_t dscp)
+{
+    struct stream *stream;
+    int error;
+
+    error = stream_open_with_default_port(name, OFP_PORT, &stream, dscp);
+    if (!error) {
+        error = stream_connect(stream);
+        if (!error || error == EAGAIN) {
+            *vconnp = vconn_stream_new(stream, error, allowed_versions);
+            return 0;
+        }
+    }
+
+    stream_close(stream);
+    return error;
 }
 
-static struct stream_vconn *
-stream_vconn_cast(struct vconn *vconn)
+static struct vconn_stream *
+vconn_stream_cast(struct vconn *vconn)
 {
-    vconn_assert_class(vconn, &stream_vconn_class);
-    return CONTAINER_OF(vconn, struct stream_vconn, vconn);
+    return CONTAINER_OF(vconn, struct vconn_stream, vconn);
 }
 
 static void
-stream_close(struct vconn *vconn)
+vconn_stream_close(struct vconn *vconn)
 {
-    struct stream_vconn *s = stream_vconn_cast(vconn);
-    poll_cancel(s->tx_waiter);
-    stream_clear_txbuf(s);
+    struct vconn_stream *s = vconn_stream_cast(vconn);
+
+    if ((vconn->error == EPROTO || s->n_packets < 1) && s->rxbuf) {
+        stream_report_content(s->rxbuf->data, s->rxbuf->size, STREAM_OPENFLOW,
+                              &this_module, vconn_get_name(vconn));
+    }
+
+    stream_close(s->stream);
+    vconn_stream_clear_txbuf(s);
     ofpbuf_delete(s->rxbuf);
-    close(s->fd);
     free(s);
 }
 
 static int
-stream_connect(struct vconn *vconn)
+vconn_stream_connect(struct vconn *vconn)
 {
-    struct stream_vconn *s = stream_vconn_cast(vconn);
-    return check_connection_completion(s->fd);
+    struct vconn_stream *s = vconn_stream_cast(vconn);
+    return stream_connect(s->stream);
 }
 
 static int
-stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
+vconn_stream_recv__(struct vconn_stream *s, int rx_len)
 {
-    struct stream_vconn *s = stream_vconn_cast(vconn);
-    struct ofpbuf *rx;
-    size_t want_bytes;
-    ssize_t retval;
-
-    if (s->rxbuf == NULL) {
-        s->rxbuf = ofpbuf_new(1564);
-    }
-    rx = s->rxbuf;
+    struct ofpbuf *rx = s->rxbuf;
+    int want_bytes, retval;
 
-again:
-    if (sizeof(struct ofp_header) > rx->size) {
-        want_bytes = sizeof(struct ofp_header) - rx->size;
-    } else {
-        struct ofp_header *oh = rx->data;
-        size_t length = ntohs(oh->length);
-        if (length < sizeof(struct ofp_header)) {
-            VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
-                        length);
-            return EPROTO;
-        }
-        want_bytes = length - rx->size;
-        if (!want_bytes) {
-            *bufferp = rx;
-            s->rxbuf = NULL;
-            return 0;
-        }
-    }
+    want_bytes = rx_len - rx->size;
     ofpbuf_prealloc_tailroom(rx, want_bytes);
-
-    retval = read(s->fd, ofpbuf_tail(rx), want_bytes);
+    retval = stream_recv(s->stream, ofpbuf_tail(rx), want_bytes);
     if (retval > 0) {
         rx->size += retval;
-        if (retval == want_bytes) {
-            if (rx->size > sizeof(struct ofp_header)) {
-                *bufferp = rx;
-                s->rxbuf = NULL;
-                return 0;
-            } else {
-                goto again;
-            }
-        }
-        return EAGAIN;
+        return retval == want_bytes ? 0 : EAGAIN;
     } else if (retval == 0) {
         if (rx->size) {
             VLOG_ERR_RL(&rl, "connection dropped mid-packet");
             return EPROTO;
-        } else {
-            return EOF;
         }
+        return EOF;
     } else {
-        return errno;
+        return -retval;
     }
 }
 
-static void
-stream_clear_txbuf(struct stream_vconn *s)
+static int
+vconn_stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
 {
-    ofpbuf_delete(s->txbuf);
-    s->txbuf = NULL;
-    s->tx_waiter = NULL;
-}
+    struct vconn_stream *s = vconn_stream_cast(vconn);
+    const struct ofp_header *oh;
+    int rx_len;
 
-static void
-stream_do_tx(int fd UNUSED, short int revents UNUSED, void *vconn_)
-{
-    struct vconn *vconn = vconn_;
-    struct stream_vconn *s = stream_vconn_cast(vconn);
-    ssize_t n = write(s->fd, s->txbuf->data, s->txbuf->size);
-    if (n < 0) {
-        if (errno != EAGAIN) {
-            VLOG_ERR_RL(&rl, "send: %s", strerror(errno));
-            stream_clear_txbuf(s);
-            return;
+    /* Allocate new receive buffer if we don't have one. */
+    if (s->rxbuf == NULL) {
+        s->rxbuf = ofpbuf_new(1564);
+    }
+
+    /* Read ofp_header. */
+    if (s->rxbuf->size < sizeof(struct ofp_header)) {
+        int retval = vconn_stream_recv__(s, sizeof(struct ofp_header));
+        if (retval) {
+            return retval;
         }
-    } else if (n > 0) {
-        ofpbuf_pull(s->txbuf, n);
-        if (!s->txbuf->size) {
-            stream_clear_txbuf(s);
-            return;
+    }
+
+    /* Read payload. */
+    oh = s->rxbuf->data;
+    rx_len = ntohs(oh->length);
+    if (rx_len < sizeof(struct ofp_header)) {
+        VLOG_ERR_RL(&rl, "received too-short ofp_header (%d bytes)", rx_len);
+        return EPROTO;
+    } else if (s->rxbuf->size < rx_len) {
+        int retval = vconn_stream_recv__(s, rx_len);
+        if (retval) {
+            return retval;
         }
     }
-    s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
+
+    s->n_packets++;
+    *bufferp = s->rxbuf;
+    s->rxbuf = NULL;
+    return 0;
+}
+
+static void
+vconn_stream_clear_txbuf(struct vconn_stream *s)
+{
+    ofpbuf_delete(s->txbuf);
+    s->txbuf = NULL;
 }
 
 static int
-stream_send(struct vconn *vconn, struct ofpbuf *buffer)
+vconn_stream_send(struct vconn *vconn, struct ofpbuf *buffer)
 {
-    struct stream_vconn *s = stream_vconn_cast(vconn);
+    struct vconn_stream *s = vconn_stream_cast(vconn);
     ssize_t retval;
 
     if (s->txbuf) {
         return EAGAIN;
     }
 
-    retval = write(s->fd, buffer->data, buffer->size);
+    retval = stream_send(s->stream, buffer->data, buffer->size);
     if (retval == buffer->size) {
         ofpbuf_delete(buffer);
         return 0;
-    } else if (retval >= 0 || errno == EAGAIN) {
-        leak_checker_claim(buffer);
+    } else if (retval >= 0 || retval == -EAGAIN) {
         s->txbuf = buffer;
         if (retval > 0) {
             ofpbuf_pull(buffer, retval);
         }
-        s->tx_waiter = poll_fd_callback(s->fd, POLLOUT, stream_do_tx, vconn);
         return 0;
     } else {
-        return errno;
+        return -retval;
+    }
+}
+
+static void
+vconn_stream_run(struct vconn *vconn)
+{
+    struct vconn_stream *s = vconn_stream_cast(vconn);
+    ssize_t retval;
+
+    stream_run(s->stream);
+    if (!s->txbuf) {
+        return;
+    }
+
+    retval = stream_send(s->stream, s->txbuf->data, s->txbuf->size);
+    if (retval < 0) {
+        if (retval != -EAGAIN) {
+            VLOG_ERR_RL(&rl, "send: %s", ovs_strerror(-retval));
+            vconn_stream_clear_txbuf(s);
+            return;
+        }
+    } else if (retval > 0) {
+        ofpbuf_pull(s->txbuf, retval);
+        if (!s->txbuf->size) {
+            vconn_stream_clear_txbuf(s);
+            return;
+        }
+    }
+}
+
+static void
+vconn_stream_run_wait(struct vconn *vconn)
+{
+    struct vconn_stream *s = vconn_stream_cast(vconn);
+
+    stream_run_wait(s->stream);
+    if (s->txbuf) {
+        stream_send_wait(s->stream);
     }
 }
 
 static void
-stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
+vconn_stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
 {
-    struct stream_vconn *s = stream_vconn_cast(vconn);
+    struct vconn_stream *s = vconn_stream_cast(vconn);
     switch (wait) {
     case WAIT_CONNECT:
-        poll_fd_wait(s->fd, POLLOUT);
+        stream_connect_wait(s->stream);
         break;
 
     case WAIT_SEND:
         if (!s->txbuf) {
-            poll_fd_wait(s->fd, POLLOUT);
+            stream_send_wait(s->stream);
         } else {
-            /* Nothing to do: need to drain txbuf first. */
+            /* Nothing to do: need to drain txbuf first.
+             * vconn_stream_run_wait() will arrange to wake up when there room
+             * to send data, so there's no point in calling poll_fd_wait()
+             * redundantly here. */
         }
         break;
 
     case WAIT_RECV:
-        poll_fd_wait(s->fd, POLLIN);
+        stream_recv_wait(s->stream);
         break;
 
     default:
-        NOT_REACHED();
+        OVS_NOT_REACHED();
     }
 }
-
-static struct vconn_class stream_vconn_class = {
-    "stream",                   /* name */
-    NULL,                       /* open */
-    stream_close,               /* close */
-    stream_connect,             /* connect */
-    stream_recv,                /* recv */
-    stream_send,                /* send */
-    stream_wait,                /* wait */
-};
 
 /* Passive stream socket vconn. */
 
-struct pstream_pvconn
+struct pvconn_pstream
 {
     struct pvconn pvconn;
-    int fd;
-    int (*accept_cb)(int fd, const struct sockaddr *, size_t sa_len,
-                     struct vconn **);
+    struct pstream *pstream;
 };
 
-static struct pvconn_class pstream_pvconn_class;
+static const struct pvconn_class pstream_pvconn_class;
 
-static struct pstream_pvconn *
-pstream_pvconn_cast(struct pvconn *pvconn)
+static struct pvconn_pstream *
+pvconn_pstream_cast(struct pvconn *pvconn)
 {
-    pvconn_assert_class(pvconn, &pstream_pvconn_class);
-    return CONTAINER_OF(pvconn, struct pstream_pvconn, pvconn);
+    return CONTAINER_OF(pvconn, struct pvconn_pstream, pvconn);
 }
 
-int
-new_pstream_pvconn(const char *name, int fd,
-                  int (*accept_cb)(int fd, const struct sockaddr *,
-                                   size_t sa_len, struct vconn **),
-                  struct pvconn **pvconnp)
+/* Creates a new pvconn named 'name' that will accept new connections using
+ * pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
+ *
+ * Returns 0 if successful, otherwise a positive errno value.  (The current
+ * implementation never fails.) */
+static int
+pvconn_pstream_listen(const char *name, uint32_t allowed_versions,
+                      char *suffix OVS_UNUSED, struct pvconn **pvconnp,
+                      uint8_t dscp)
 {
-    struct pstream_pvconn *ps = xmalloc(sizeof *ps);
-    pvconn_init(&ps->pvconn, &pstream_pvconn_class, name);
-    ps->fd = fd;
-    ps->accept_cb = accept_cb;
+    struct pvconn_pstream *ps;
+    struct pstream *pstream;
+    int error;
+
+    error = pstream_open_with_default_port(name, OFP_PORT, &pstream, dscp);
+    if (error) {
+        return error;
+    }
+
+    ps = xmalloc(sizeof *ps);
+    pvconn_init(&ps->pvconn, &pstream_pvconn_class, name, allowed_versions);
+    ps->pstream = pstream;
     *pvconnp = &ps->pvconn;
     return 0;
 }
 
 static void
-pstream_close(struct pvconn *pvconn)
+pvconn_pstream_close(struct pvconn *pvconn)
 {
-    struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
-    close(ps->fd);
+    struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
+    pstream_close(ps->pstream);
     free(ps);
 }
 
 static int
-pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
+pvconn_pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
 {
-    struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
-    struct sockaddr_storage ss;
-    socklen_t ss_len = sizeof ss;
-    int new_fd;
-    int retval;
-
-    new_fd = accept(ps->fd, (struct sockaddr *) &ss, &ss_len);
-    if (new_fd < 0) {
-        int retval = errno;
-        if (retval != EAGAIN) {
-            VLOG_DBG_RL(&rl, "accept: %s", strerror(retval));
+    struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
+    struct stream *stream;
+    int error;
+
+    error = pstream_accept(ps->pstream, &stream);
+    if (error) {
+        if (error != EAGAIN) {
+            VLOG_DBG_RL(&rl, "%s: accept: %s",
+                        pstream_get_name(ps->pstream), ovs_strerror(error));
         }
-        return retval;
+        return error;
     }
 
-    retval = set_nonblocking(new_fd);
-    if (retval) {
-        close(new_fd);
-        return retval;
-    }
-
-    return ps->accept_cb(new_fd, (const struct sockaddr *) &ss, ss_len,
-                         new_vconnp);
+    *new_vconnp = vconn_stream_new(stream, 0, pvconn->allowed_versions);
+    return 0;
 }
 
 static void
-pstream_wait(struct pvconn *pvconn)
+pvconn_pstream_wait(struct pvconn *pvconn)
 {
-    struct pstream_pvconn *ps = pstream_pvconn_cast(pvconn);
-    poll_fd_wait(ps->fd, POLLIN);
+    struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
+    pstream_wait(ps->pstream);
 }
+
+/* Stream-based vconns and pvconns. */
+
+#define STREAM_INIT(NAME)                           \
+    {                                               \
+            NAME,                                   \
+            vconn_stream_open,                      \
+            vconn_stream_close,                     \
+            vconn_stream_connect,                   \
+            vconn_stream_recv,                      \
+            vconn_stream_send,                      \
+            vconn_stream_run,                       \
+            vconn_stream_run_wait,                  \
+            vconn_stream_wait,                      \
+    }
 
-static struct pvconn_class pstream_pvconn_class = {
-    "pstream",
-    NULL,
-    pstream_close,
-    pstream_accept,
-    pstream_wait
-};
+#define PSTREAM_INIT(NAME)                          \
+    {                                               \
+            NAME,                                   \
+            pvconn_pstream_listen,                  \
+            pvconn_pstream_close,                   \
+            pvconn_pstream_accept,                  \
+            pvconn_pstream_wait                     \
+    }
+
+static const struct vconn_class stream_vconn_class = STREAM_INIT("stream");
+static const struct pvconn_class pstream_pvconn_class = PSTREAM_INIT("pstream");
+
+const struct vconn_class tcp_vconn_class = STREAM_INIT("tcp");
+const struct pvconn_class ptcp_pvconn_class = PSTREAM_INIT("ptcp");
+
+const struct vconn_class unix_vconn_class = STREAM_INIT("unix");
+const struct pvconn_class punix_pvconn_class = PSTREAM_INIT("punix");
+
+#ifdef HAVE_OPENSSL
+const struct vconn_class ssl_vconn_class = STREAM_INIT("ssl");
+const struct pvconn_class pssl_pvconn_class = PSTREAM_INIT("pssl");
+#endif