rconn: Fix null pointer dereference in rconn_add_monitor().

[sliver-openvswitch.git] / lib / rconn.c

diff --git a/lib/rconn.c b/lib/rconn.c
index ddf578c..9b6cd86 100644 (file)
--- a/lib/rconn.c
+++ b/lib/rconn.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,6 @@
 
 #include <config.h>
 #include "rconn.h"
-#include <assert.h>
 #include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
@@ -131,8 +130,15 @@ struct rconn {
 #define MAX_MONITORS 8
     struct vconn *monitors[8];
     size_t n_monitors;
+
+    uint32_t allowed_versions;
 };
 
+uint32_t rconn_get_allowed_versions(const struct rconn *rconn)
+{
+    return rconn->allowed_versions;
+}
+
 static unsigned int elapsed_in_this_state(const struct rconn *);
 static unsigned int timeout(const struct rconn *);
 static bool timed_out(const struct rconn *);
@@ -163,9 +169,17 @@ static bool rconn_logging_connection_attempts__(const struct rconn *);
  * 8 seconds is used.
  *
  * The new rconn is initially unconnected.  Use rconn_connect() or
- * rconn_connect_unreliably() to connect it. */
+ * rconn_connect_unreliably() to connect it.
+ *
+ * Connections made by the rconn will automatically negotiate an OpenFlow
+ * protocol version acceptable to both peers on the connection.  The version
+ * negotiated will be one of those in the 'allowed_versions' bitmap: version
+ * 'x' is allowed if allowed_versions & (1 << x) is nonzero.  (The underlying
+ * vconn will treat an 'allowed_versions' of 0 as OFPUTIL_DEFAULT_VERSIONS.)
+ */
 struct rconn *
-rconn_create(int probe_interval, int max_backoff, uint8_t dscp)
+rconn_create(int probe_interval, int max_backoff, uint8_t dscp,
+             uint32_t allowed_versions)
 {
     struct rconn *rc = xzalloc(sizeof *rc);
 
@@ -203,6 +217,7 @@ rconn_create(int probe_interval, int max_backoff, uint8_t dscp)
     rconn_set_dscp(rc, dscp);
 
     rc->n_monitors = 0;
+    rc->allowed_versions = allowed_versions;
 
     return rc;
 }
@@ -277,7 +292,7 @@ void
 rconn_connect_unreliably(struct rconn *rc,
                          struct vconn *vconn, const char *name)
 {
-    assert(vconn != NULL);
+    ovs_assert(vconn != NULL);
     rconn_disconnect(rc);
     rconn_set_target__(rc, vconn_get_name(vconn), name);
     rc->reliable = false;
@@ -354,7 +369,8 @@ reconnect(struct rconn *rc)
         VLOG_INFO("%s: connecting...", rc->name);
     }
     rc->n_attempted_connections++;
-    retval = vconn_open(rc->target, OFP10_VERSION, &rc->vconn, rc->dscp);
+    retval = vconn_open(rc->target, rc->allowed_versions, rc->dscp,
+                        &rc->vconn);
     if (!retval) {
         rc->remote_ip = vconn_get_remote_ip(rc->vconn);
         rc->local_ip = vconn_get_local_ip(rc->vconn);
@@ -452,7 +468,7 @@ run_ACTIVE(struct rconn *rc)
                  rc->name, (unsigned int) (time_now() - base));
 
         version = rconn_get_version(rc);
-        assert(version >= 0 && version <= 0xff);
+        ovs_assert(version >= 0 && version <= 0xff);
 
         /* Ordering is important here: rconn_send() can transition to BACKOFF,
          * and we don't want to transition back to IDLE if so, because then we
@@ -632,14 +648,13 @@ int
 rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
                       struct rconn_packet_counter *counter, int queue_limit)
 {
-    int retval;
-    retval = (counter->n_packets >= queue_limit
-              ? EAGAIN
-              : rconn_send(rc, b, counter));
-    if (retval) {
+    if (counter->n_packets < queue_limit) {
+        return rconn_send(rc, b, counter);
+    } else {
         COVERAGE_INC(rconn_overflow);
+        ofpbuf_delete(b);
+        return EAGAIN;
     }
-    return retval;
 }
 
 /* Returns the total number of packets successfully sent on the underlying
@@ -840,7 +855,7 @@ void
 rconn_packet_counter_destroy(struct rconn_packet_counter *c)
 {
     if (c) {
-        assert(c->ref_cnt > 0);
+        ovs_assert(c->ref_cnt > 0);
         if (!--c->ref_cnt && !c->n_packets) {
             free(c);
         }
@@ -857,13 +872,13 @@ rconn_packet_counter_inc(struct rconn_packet_counter *c, unsigned int n_bytes)
 void
 rconn_packet_counter_dec(struct rconn_packet_counter *c, unsigned int n_bytes)
 {
-    assert(c->n_packets > 0);
-    assert(c->n_bytes >= n_bytes);
+    ovs_assert(c->n_packets > 0);
+    ovs_assert(c->n_bytes >= n_bytes);
 
     c->n_bytes -= n_bytes;
     c->n_packets--;
     if (!c->n_packets) {
-        assert(!c->n_bytes);
+        ovs_assert(!c->n_bytes);
         if (!c->ref_cnt) {
             free(c);
         }
@@ -1096,6 +1111,26 @@ is_admitted_msg(const struct ofpbuf *b)
     case OFPTYPE_GET_CONFIG_REQUEST:
     case OFPTYPE_GET_CONFIG_REPLY:
     case OFPTYPE_SET_CONFIG:
+        /* FIXME: Change the following once they are implemented: */
+    case OFPTYPE_QUEUE_GET_CONFIG_REQUEST:
+    case OFPTYPE_QUEUE_GET_CONFIG_REPLY:
+    case OFPTYPE_GET_ASYNC_REQUEST:
+    case OFPTYPE_GET_ASYNC_REPLY:
+    case OFPTYPE_METER_MOD:
+    case OFPTYPE_GROUP_REQUEST:
+    case OFPTYPE_GROUP_REPLY:
+    case OFPTYPE_GROUP_DESC_REQUEST:
+    case OFPTYPE_GROUP_DESC_REPLY:
+    case OFPTYPE_GROUP_FEATURES_REQUEST:
+    case OFPTYPE_GROUP_FEATURES_REPLY:
+    case OFPTYPE_METER_REQUEST:
+    case OFPTYPE_METER_REPLY:
+    case OFPTYPE_METER_CONFIG_REQUEST:
+    case OFPTYPE_METER_CONFIG_REPLY:
+    case OFPTYPE_METER_FEATURES_REQUEST:
+    case OFPTYPE_METER_FEATURES_REPLY:
+    case OFPTYPE_TABLE_FEATURES_REQUEST:
+    case OFPTYPE_TABLE_FEATURES_REPLY:
         return false;
 
     case OFPTYPE_PACKET_IN: