lib/vconn-stream.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include <assert.h>
  19 #include <errno.h>
  20 #include <poll.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/types.h>
  24 #include <unistd.h>
  25 #include "fatal-signal.h"
  26 #include "leak-checker.h"
  27 #include "ofpbuf.h"
  28 #include "openflow/openflow.h"
  29 #include "poll-loop.h"
  30 #include "socket-util.h"
  31 #include "stream.h"
  32 #include "util.h"
  33 #include "vconn-provider.h"
  34 #include "vconn.h"
  35
  36 #include "vlog.h"
  37 #define THIS_MODULE VLM_vconn_stream
  38
  39 /* Active stream socket vconn. */
  40
  41 struct vconn_stream
  42 {
  43     struct vconn vconn;
  44     struct stream *stream;
  45     struct ofpbuf *rxbuf;
  46     struct ofpbuf *txbuf;
  47     int n_packets;
  48 };
  49
  50 static struct vconn_class stream_vconn_class;
  51
  52 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
  53
  54 static void vconn_stream_clear_txbuf(struct vconn_stream *);
  55
  56 static struct vconn *
  57 vconn_stream_new(struct stream *stream, int connect_status)
  58 {
  59     struct vconn_stream *s;
  60
  61     s = xmalloc(sizeof *s);
  62     vconn_init(&s->vconn, &stream_vconn_class, connect_status,
  63                stream_get_name(stream));
  64     s->stream = stream;
  65     s->txbuf = NULL;
  66     s->rxbuf = NULL;
  67     s->n_packets = 0;
  68     s->vconn.remote_ip = stream_get_remote_ip(stream);
  69     s->vconn.remote_port = stream_get_remote_port(stream);
  70     s->vconn.local_ip = stream_get_local_ip(stream);
  71     s->vconn.local_port = stream_get_local_port(stream);
  72     return &s->vconn;
  73 }
  74
  75 /* Creates a new vconn that will send and receive data on a stream named 'name'
  76  * and stores a pointer to the vconn in '*vconnp'.
  77  *
  78  * Returns 0 if successful, otherwise a positive errno value. */
  79 static int
  80 vconn_stream_open(const char *name, char *suffix OVS_UNUSED,
  81                   struct vconn **vconnp)
  82 {
  83     struct stream *stream;
  84     int error;
  85
  86     error = stream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
  87                                            &stream);
  88
  89     if (error && error != EAGAIN) {
  90         return error;
  91     }
  92
  93     *vconnp = vconn_stream_new(stream, error);
  94     return 0;
  95 }
  96
  97 static struct vconn_stream *
  98 vconn_stream_cast(struct vconn *vconn)
  99 {
 100     return CONTAINER_OF(vconn, struct vconn_stream, vconn);
 101 }
 102
 103 static void
 104 vconn_stream_close(struct vconn *vconn)
 105 {
 106     struct vconn_stream *s = vconn_stream_cast(vconn);
 107
 108     if ((vconn->error == EPROTO || s->n_packets < 1) && s->rxbuf) {
 109         stream_report_content(s->rxbuf->data, s->rxbuf->size, STREAM_OPENFLOW,
 110                               THIS_MODULE, vconn_get_name(vconn));
 111     }
 112
 113     stream_close(s->stream);
 114     vconn_stream_clear_txbuf(s);
 115     ofpbuf_delete(s->rxbuf);
 116     free(s);
 117 }
 118
 119 static int
 120 vconn_stream_connect(struct vconn *vconn)
 121 {
 122     struct vconn_stream *s = vconn_stream_cast(vconn);
 123     return stream_connect(s->stream);
 124 }
 125
 126 static int
 127 vconn_stream_recv__(struct vconn_stream *s, int rx_len)
 128 {
 129     struct ofpbuf *rx = s->rxbuf;
 130     int want_bytes, retval;
 131
 132     want_bytes = rx_len - rx->size;
 133     ofpbuf_prealloc_tailroom(rx, want_bytes);
 134     retval = stream_recv(s->stream, ofpbuf_tail(rx), want_bytes);
 135     if (retval > 0) {
 136         rx->size += retval;
 137         return retval == want_bytes ? 0 : EAGAIN;
 138     } else if (retval == 0) {
 139         if (rx->size) {
 140             VLOG_ERR_RL(&rl, "connection dropped mid-packet");
 141             return EPROTO;
 142         }
 143         return EOF;
 144     } else {
 145         return -retval;
 146     }
 147 }
 148
 149 static int
 150 vconn_stream_recv(struct vconn *vconn, struct ofpbuf **bufferp)
 151 {
 152     struct vconn_stream *s = vconn_stream_cast(vconn);
 153     const struct ofp_header *oh;
 154     int rx_len;
 155
 156     /* Allocate new receive buffer if we don't have one. */
 157     if (s->rxbuf == NULL) {
 158         s->rxbuf = ofpbuf_new(1564);
 159     }
 160
 161     /* Read ofp_header. */
 162     if (s->rxbuf->size < sizeof(struct ofp_header)) {
 163         int retval = vconn_stream_recv__(s, sizeof(struct ofp_header));
 164         if (retval) {
 165             return retval;
 166         }
 167     }
 168
 169     /* Read payload. */
 170     oh = s->rxbuf->data;
 171     rx_len = ntohs(oh->length);
 172     if (rx_len < sizeof(struct ofp_header)) {
 173         VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
 174                     rx_len);
 175         return EPROTO;
 176     } else if (s->rxbuf->size < rx_len) {
 177         int retval = vconn_stream_recv__(s, rx_len);
 178         if (retval) {
 179             return retval;
 180         }
 181     }
 182
 183     s->n_packets++;
 184     *bufferp = s->rxbuf;
 185     s->rxbuf = NULL;
 186     return 0;
 187 }
 188
 189 static void
 190 vconn_stream_clear_txbuf(struct vconn_stream *s)
 191 {
 192     ofpbuf_delete(s->txbuf);
 193     s->txbuf = NULL;
 194 }
 195
 196 static int
 197 vconn_stream_send(struct vconn *vconn, struct ofpbuf *buffer)
 198 {
 199     struct vconn_stream *s = vconn_stream_cast(vconn);
 200     ssize_t retval;
 201
 202     if (s->txbuf) {
 203         return EAGAIN;
 204     }
 205
 206     retval = stream_send(s->stream, buffer->data, buffer->size);
 207     if (retval == buffer->size) {
 208         ofpbuf_delete(buffer);
 209         return 0;
 210     } else if (retval >= 0 || retval == -EAGAIN) {
 211         leak_checker_claim(buffer);
 212         s->txbuf = buffer;
 213         if (retval > 0) {
 214             ofpbuf_pull(buffer, retval);
 215         }
 216         return 0;
 217     } else {
 218         return -retval;
 219     }
 220 }
 221
 222 static void
 223 vconn_stream_run(struct vconn *vconn)
 224 {
 225     struct vconn_stream *s = vconn_stream_cast(vconn);
 226     ssize_t retval;
 227
 228     if (!s->txbuf) {
 229         return;
 230     }
 231
 232     retval = stream_send(s->stream, s->txbuf->data, s->txbuf->size);
 233     if (retval < 0) {
 234         if (retval != -EAGAIN) {
 235             VLOG_ERR_RL(&rl, "send: %s", strerror(-retval));
 236             vconn_stream_clear_txbuf(s);
 237             return;
 238         }
 239     } else if (retval > 0) {
 240         ofpbuf_pull(s->txbuf, retval);
 241         if (!s->txbuf->size) {
 242             vconn_stream_clear_txbuf(s);
 243             return;
 244         }
 245     }
 246 }
 247
 248 static void
 249 vconn_stream_run_wait(struct vconn *vconn)
 250 {
 251     struct vconn_stream *s = vconn_stream_cast(vconn);
 252
 253     if (s->txbuf) {
 254         stream_send_wait(s->stream);
 255     }
 256 }
 257
 258 static void
 259 vconn_stream_wait(struct vconn *vconn, enum vconn_wait_type wait)
 260 {
 261     struct vconn_stream *s = vconn_stream_cast(vconn);
 262     switch (wait) {
 263     case WAIT_CONNECT:
 264         stream_connect_wait(s->stream);
 265         break;
 266
 267     case WAIT_SEND:
 268         if (!s->txbuf) {
 269             stream_send_wait(s->stream);
 270         } else {
 271             /* Nothing to do: need to drain txbuf first.
 272              * vconn_stream_run_wait() will arrange to wake up when there room
 273              * to send data, so there's no point in calling poll_fd_wait()
 274              * redundantly here. */
 275         }
 276         break;
 277
 278     case WAIT_RECV:
 279         stream_recv_wait(s->stream);
 280         break;
 281
 282     default:
 283         NOT_REACHED();
 284     }
 285 }
 286 \f
 287 /* Passive stream socket vconn. */
 288
 289 struct pvconn_pstream
 290 {
 291     struct pvconn pvconn;
 292     struct pstream *pstream;
 293 };
 294
 295 static struct pvconn_class pstream_pvconn_class;
 296
 297 static struct pvconn_pstream *
 298 pvconn_pstream_cast(struct pvconn *pvconn)
 299 {
 300     return CONTAINER_OF(pvconn, struct pvconn_pstream, pvconn);
 301 }
 302
 303 /* Creates a new pvconn named 'name' that will accept new connections using
 304  * pstream_accept() and stores a pointer to the pvconn in '*pvconnp'.
 305  *
 306  * Returns 0 if successful, otherwise a positive errno value.  (The current
 307  * implementation never fails.) */
 308 static int
 309 pvconn_pstream_listen(const char *name, char *suffix OVS_UNUSED,
 310                       struct pvconn **pvconnp)
 311 {
 312     struct pvconn_pstream *ps;
 313     struct pstream *pstream;
 314     int error;
 315
 316     error = pstream_open_with_default_ports(name, OFP_TCP_PORT, OFP_SSL_PORT,
 317                                             &pstream);
 318     if (error) {
 319         return error;
 320     }
 321
 322     ps = xmalloc(sizeof *ps);
 323     pvconn_init(&ps->pvconn, &pstream_pvconn_class, name);
 324     ps->pstream = pstream;
 325     *pvconnp = &ps->pvconn;
 326     return 0;
 327 }
 328
 329 static void
 330 pvconn_pstream_close(struct pvconn *pvconn)
 331 {
 332     struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
 333     pstream_close(ps->pstream);
 334     free(ps);
 335 }
 336
 337 static int
 338 pvconn_pstream_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
 339 {
 340     struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
 341     struct stream *stream;
 342     int error;
 343
 344     error = pstream_accept(ps->pstream, &stream);
 345     if (error) {
 346         if (error != EAGAIN) {
 347             VLOG_DBG_RL(&rl, "%s: accept: %s",
 348                         pstream_get_name(ps->pstream), strerror(error));
 349         }
 350         return error;
 351     }
 352
 353     *new_vconnp = vconn_stream_new(stream, 0);
 354     return 0;
 355 }
 356
 357 static void
 358 pvconn_pstream_wait(struct pvconn *pvconn)
 359 {
 360     struct pvconn_pstream *ps = pvconn_pstream_cast(pvconn);
 361     pstream_wait(ps->pstream);
 362 }
 363 \f
 364 /* Stream-based vconns and pvconns. */
 365
 366 #define DEFINE_VCONN_STREAM_CLASS(NAME)             \
 367         struct vconn_class NAME##_vconn_class = {   \
 368             #NAME,                                  \
 369             vconn_stream_open,                      \
 370             vconn_stream_close,                     \
 371             vconn_stream_connect,                   \
 372             vconn_stream_recv,                      \
 373             vconn_stream_send,                      \
 374             vconn_stream_run,                       \
 375             vconn_stream_run_wait,                  \
 376             vconn_stream_wait,                      \
 377         };
 378
 379 #define DEFINE_PVCONN_STREAM_CLASS(NAME)            \
 380         struct pvconn_class NAME##_pvconn_class = { \
 381             #NAME,                                  \
 382             pvconn_pstream_listen,                  \
 383             pvconn_pstream_close,                   \
 384             pvconn_pstream_accept,                  \
 385             pvconn_pstream_wait                     \
 386         };
 387
 388 static DEFINE_VCONN_STREAM_CLASS(stream);
 389 static DEFINE_PVCONN_STREAM_CLASS(pstream);
 390
 391 DEFINE_VCONN_STREAM_CLASS(tcp);
 392 DEFINE_PVCONN_STREAM_CLASS(ptcp);
 393
 394 DEFINE_VCONN_STREAM_CLASS(unix);
 395 DEFINE_PVCONN_STREAM_CLASS(punix);
 396
 397 #ifdef HAVE_OPENSSL
 398 DEFINE_VCONN_STREAM_CLASS(ssl);
 399 DEFINE_PVCONN_STREAM_CLASS(pssl);
 400 #endif