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/*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "net/filter.h"
#include "net/net.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qapi-visit.h"
#include "qom/object.h"
#include "qemu/main-loop.h"
#include "qemu/error-report.h"
#include "trace.h"
#include "sysemu/char.h"
#include "qemu/iov.h"
#include "qemu/sockets.h"
#define FILTER_MIRROR(obj) \
OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_MIRROR)
#define TYPE_FILTER_MIRROR "filter-mirror"
typedef struct MirrorState {
NetFilterState parent_obj;
char *outdev;
CharDriverState *chr_out;
} MirrorState;
static int filter_mirror_send(NetFilterState *nf,
const struct iovec *iov,
int iovcnt)
{
MirrorState *s = FILTER_MIRROR(nf);
int ret = 0;
ssize_t size = 0;
uint32_t len = 0;
char *buf;
size = iov_size(iov, iovcnt);
if (!size) {
return 0;
}
len = htonl(size);
ret = qemu_chr_fe_write_all(s->chr_out, (uint8_t *)&len, sizeof(len));
if (ret != sizeof(len)) {
goto err;
}
buf = g_malloc(size);
iov_to_buf(iov, iovcnt, 0, buf, size);
ret = qemu_chr_fe_write_all(s->chr_out, (uint8_t *)buf, size);
g_free(buf);
if (ret != size) {
goto err;
}
return 0;
err:
return ret < 0 ? ret : -EIO;
}
static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
NetPacketSent *sent_cb)
{
int ret;
ret = filter_mirror_send(nf, iov, iovcnt);
if (ret) {
error_report("filter_mirror_send failed(%s)", strerror(-ret));
}
/*
* we don't hope this error interrupt the normal
* path of net packet, so we always return zero.
*/
return 0;
}
static void filter_mirror_cleanup(NetFilterState *nf)
{
MirrorState *s = FILTER_MIRROR(nf);
if (s->chr_out) {
qemu_chr_fe_release(s->chr_out);
}
}
static void filter_mirror_setup(NetFilterState *nf, Error **errp)
{
MirrorState *s = FILTER_MIRROR(nf);
if (!s->outdev) {
error_setg(errp, "filter filter mirror needs 'outdev' "
"property set");
return;
}
s->chr_out = qemu_chr_find(s->outdev);
if (s->chr_out == NULL) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", s->outdev);
return;
}
if (qemu_chr_fe_claim(s->chr_out) != 0) {
error_setg(errp, QERR_DEVICE_IN_USE, s->outdev);
return;
}
}
static void filter_mirror_class_init(ObjectClass *oc, void *data)
{
NetFilterClass *nfc = NETFILTER_CLASS(oc);
nfc->setup = filter_mirror_setup;
nfc->cleanup = filter_mirror_cleanup;
nfc->receive_iov = filter_mirror_receive_iov;
}
static char *filter_mirror_get_outdev(Object *obj, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
return g_strdup(s->outdev);
}
static void
filter_mirror_set_outdev(Object *obj, const char *value, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
g_free(s->outdev);
s->outdev = g_strdup(value);
if (!s->outdev) {
error_setg(errp, "filter filter mirror needs 'outdev' "
"property set");
return;
}
}
static void filter_mirror_init(Object *obj)
{
object_property_add_str(obj, "outdev", filter_mirror_get_outdev,
filter_mirror_set_outdev, NULL);
}
static void filter_mirror_fini(Object *obj)
{
MirrorState *s = FILTER_MIRROR(obj);
g_free(s->outdev);
}
static const TypeInfo filter_mirror_info = {
.name = TYPE_FILTER_MIRROR,
.parent = TYPE_NETFILTER,
.class_init = filter_mirror_class_init,
.instance_init = filter_mirror_init,
.instance_finalize = filter_mirror_fini,
.instance_size = sizeof(MirrorState),
};
static void register_types(void)
{
type_register_static(&filter_mirror_info);
}
type_init(register_types);
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