#include "ofp-print.h"
#include "openflow.h"
#include "poll-loop.h"
+#include "random.h"
#include "util.h"
#define THIS_MODULE VLM_vconn
vconn_wait(vconn, WAIT_SEND);
}
+/* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
+ * containing an OpenFlow header with the given 'type' and a random transaction
+ * id. Stores the new buffer in '*bufferp'. The caller must free the buffer
+ * when it is no longer needed. */
+void *
+make_openflow(size_t openflow_len, uint8_t type, struct buffer **bufferp)
+{
+ return make_openflow_xid(openflow_len, type, random_uint32(), bufferp);
+}
+
+/* Allocates and returns the first byte of a buffer 'openflow_len' bytes long,
+ * containing an OpenFlow header with the given 'type' and transaction id
+ * 'xid'. Stores the new buffer in '*bufferp'. The caller must free the
+ * buffer when it is no longer needed. */
+void *
+make_openflow_xid(size_t openflow_len, uint8_t type, uint32_t xid,
+ struct buffer **bufferp)
+{
+ struct buffer *buffer;
+ struct ofp_header *oh;
+
+ assert(openflow_len >= sizeof *oh);
+ assert(openflow_len <= UINT16_MAX);
+ buffer = *bufferp = buffer_new(openflow_len);
+ oh = buffer_put_uninit(buffer, openflow_len);
+ memset(oh, 0, openflow_len);
+ oh->version = OFP_VERSION;
+ oh->type = type;
+ oh->length = htons(openflow_len);
+ oh->xid = xid;
+ return oh;
+}
+
+/* Updates the 'length' field of the OpenFlow message in 'buffer' to
+ * 'buffer->size'. */
+void
+update_openflow_length(struct buffer *buffer)
+{
+ struct ofp_header *oh = buffer_at_assert(buffer, 0, sizeof *oh);
+ oh->length = htons(buffer->size);
+}
+
struct buffer *
make_add_simple_flow(const struct flow *flow,
uint32_t buffer_id, uint16_t out_port, uint16_t max_idle)