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vr_message.c
350 lines (279 loc) · 7.22 KB
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vr_message.c
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/*
* vr_message.c -- message protocol and transport independent interface for
* vrouter
*
* Copyright (c) 2013 Juniper Networks, Inc. All rights reserved.
*/
#include <vr_os.h>
#include <vrouter.h>
#include "vr_message.h"
static char *
vr_message_default_malloc(unsigned int size)
{
return vr_malloc(size, VR_MESSAGE_OBJECT);
}
static void
vr_message_default_free(char *buf)
{
if (buf)
vr_free(buf, VR_MESSAGE_OBJECT);
return;
}
static struct vr_mtransport default_transport = {
.mtrans_alloc = vr_message_default_malloc,
.mtrans_free = vr_message_default_free,
};
static struct vr_message_handler message_h = {
.vm_trans = &default_transport,
};
void *
vr_mtrans_alloc(unsigned int size)
{
if (!message_h.vm_trans)
return NULL;
return message_h.vm_trans->mtrans_alloc(size);
}
void
vr_mtrans_free(void *buf)
{
if (!message_h.vm_trans)
return;
message_h.vm_trans->mtrans_free(buf);
return;
}
int
vr_message_request(struct vr_message *message)
{
int ret;
if (!message_h.vm_proto)
return 0;
if (vr_not_ready)
return -ENETRESET;
if (vr_not_ready)
#if defined(__FreeBSD__)
return -EBADF;
#else
return -EBADFD;
#endif
ret = message_h.vm_proto->mproto_decode(message->vr_message_buf,
message->vr_message_len, NULL, NULL);
if (ret < 0)
return ret;
return 0;
}
static int
vr_message_queue_response(char *buf, int len)
{
struct vr_message *response;
response = vr_zalloc(sizeof(*response), VR_MESSAGE_RESPONSE_OBJECT);
if (!response)
return -ENOMEM;
response->vr_message_buf = buf;
response->vr_message_len = len;
vr_queue_enqueue(&message_h.vm_response_queue,
&response->vr_message_queue);
return 0;
}
struct vr_message *
vr_message_dequeue_response(void)
{
struct vr_qelem *elem;
elem = vr_queue_dequeue(&message_h.vm_response_queue);
if (elem)
return CONTAINER_OF(vr_message_queue, struct vr_message, elem);
return NULL;
}
bool
vr_response_queue_empty(void)
{
return vr_queue_empty(&message_h.vm_response_queue);
}
void
vr_message_free(struct vr_message *message)
{
if (message) {
if (message->vr_message_buf)
vr_mtrans_free(message->vr_message_buf);
vr_free(message, VR_MESSAGE_RESPONSE_OBJECT);
}
return;
}
int
vr_message_make_request(unsigned int object_type, void *object)
{
char *buf = NULL;
int ret;
unsigned int len;
struct vr_mproto *proto;
struct vr_mtransport *trans;
struct vr_message request;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return 0;
len = proto->mproto_buf_len(object_type, object);
buf = trans->mtrans_alloc(len);
if (!buf)
return -ENOMEM;
ret = proto->mproto_encode(buf, len, object_type, object,
VR_MESSAGE_TYPE_REQUEST);
if (ret < 0)
goto request_fail;
request.vr_message_buf = buf;
request.vr_message_len = ret;
vr_message_request(&request);
request_fail:
if (buf)
trans->mtrans_free(buf);
return ret;
}
int
vr_message_process_response(int (*cb)(void *, unsigned int, void *),
void *cb_arg)
{
struct vr_message *response;
struct vr_mproto *proto;
struct vr_mtransport *trans;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return 0;
while ((response = vr_message_dequeue_response())) {
proto->mproto_decode(response->vr_message_buf,
response->vr_message_len, cb, cb_arg);
vr_message_free(response);
}
return 0;
}
int
vr_message_response(unsigned int object_type, void *object, int ret)
{
char *buf = NULL;
unsigned int len = 0;
struct vr_mproto *proto;
struct vr_mtransport *trans;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return 0;
len = proto->mproto_buf_len(object_type, object);
len += proto->mproto_buf_len(VR_RESPONSE_OBJECT_ID, NULL);
buf = trans->mtrans_alloc(len);
if (!buf)
return -ENOMEM;
ret = proto->mproto_encode_response(buf, len, object_type,
object, ret);
if (ret < 0)
goto response_fail;
return vr_message_queue_response(buf, ret);
response_fail:
if (buf)
trans->mtrans_free(buf);
vr_send_response(ret);
return ret;
}
int
vr_send_response(int code)
{
return vr_message_response(VR_NULL_OBJECT_ID, NULL, code);
}
int
vr_message_dump_object(void *arg, unsigned int object_type, void *object)
{
int ret;
struct vr_mproto *proto;
struct vr_mtransport *trans;
struct vr_message_dumper *dumper = (struct vr_message_dumper *)arg;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return 0;
ret = proto->mproto_encode(dumper->dump_buffer + dumper->dump_offset,
dumper->dump_buf_len - dumper->dump_offset,
object_type, object, VR_MESSAGE_TYPE_RESPONSE);
if (ret < 0) {
/* we have more to dump, but we have to exit early */
dumper->dump_num_dumped |= VR_MESSAGE_DUMP_INCOMPLETE;
return ret;
}
dumper->dump_offset += ret;
dumper->dump_num_dumped++;
return ret;
}
void
vr_message_dump_exit(void *context, int ret)
{
struct vr_mproto *proto;
struct vr_mtransport *trans;
struct vr_message_dumper *dumper = (struct vr_message_dumper *)context;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return;
if (dumper)
ret = dumper->dump_num_dumped;
vr_send_response(ret);
if (dumper) {
if (!dumper->dump_offset) {
if (dumper->dump_buffer)
trans->mtrans_free(dumper->dump_buffer);
} else
vr_message_queue_response(dumper->dump_buffer,
dumper->dump_offset);
vr_free(dumper, VR_MESSAGE_DUMP_OBJECT);
}
return;
}
struct vr_message_dumper *
vr_message_dump_init(void *req)
{
char *buf;
struct vr_message_dumper *dumper;
struct vr_mproto *proto;
struct vr_mtransport *trans;
proto = message_h.vm_proto;
trans = message_h.vm_trans;
if (!proto || !trans)
return NULL;
dumper = vr_zalloc(sizeof(*dumper), VR_MESSAGE_DUMP_OBJECT);
if (!dumper)
return NULL;
buf = trans->mtrans_alloc(VR_MESSAGE_PAGE_SIZE);
if (!buf) {
vr_free(dumper, VR_MESSAGE_DUMP_OBJECT);
return NULL;
}
dumper->dump_buffer = buf;
dumper->dump_buf_len = VR_MESSAGE_PAGE_SIZE;
dumper->dump_offset = 0;
dumper->dump_req = req;
return dumper;
}
void
vr_message_transport_unregister(struct vr_mtransport *trans)
{
if (message_h.vm_trans == trans)
message_h.vm_trans = NULL;
return;
}
int
vr_message_transport_register(struct vr_mtransport *trans)
{
message_h.vm_trans = trans;
return 0;
}
void
vr_message_proto_unregister(struct vr_mproto *proto)
{
if (message_h.vm_proto == proto)
message_h.vm_proto = NULL;
return;
}
int
vr_message_proto_register(struct vr_mproto *proto)
{
if (message_h.vm_proto)
return -EEXIST;
message_h.vm_proto = proto;
return 0;
}