Filter-mirror is a netfilter plugin.
It gives qemu the ability to mirror
packets to a chardev.
usage:
-netdev tap,id=hn0
-chardev socket,id=mirror0,host=ip_primary,port=X,server,nowait
-filter-mirror,id=m0,netdev=hn0,queue=tx/rx/all,outdev=mirror0
Signed-off-by: Zhang Chen <zhangchen.f...@cn.fujitsu.com>
Signed-off-by: Wen Congyang <we...@cn.fujitsu.com>
Reviewed-by: Yang Hongyang <hongyang.y...@easystack.cn>
Reviewed-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
---
net/Makefile.objs | 1 +
net/filter-mirror.c | 181 ++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-options.hx | 5 ++
vl.c | 3 +-
4 files changed, 189 insertions(+), 1 deletion(-)
create mode 100644 net/filter-mirror.c
diff --git a/net/Makefile.objs b/net/Makefile.objs
index 5fa2f97..b7c22fd 100644
--- a/net/Makefile.objs
+++ b/net/Makefile.objs
@@ -15,3 +15,4 @@ common-obj-$(CONFIG_VDE) += vde.o
common-obj-$(CONFIG_NETMAP) += netmap.o
common-obj-y += filter.o
common-obj-y += filter-buffer.o
+common-obj-y += filter-mirror.o
diff --git a/net/filter-mirror.c b/net/filter-mirror.c
new file mode 100644
index 0000000..ee13d94
--- /dev/null
+++ b/net/filter-mirror.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ * Copyright (c) 2016 FUJITSU LIMITED
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Author: Zhang Chen <zhangchen.f...@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 "net/filter.h"
+#include "net/net.h"
+#include "qemu-common.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);
diff --git a/qemu-options.hx b/qemu-options.hx
index 2f0465e..ca27863 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3759,6 +3759,11 @@ queue @var{all|rx|tx} is an option that can be applied
to any netfilter.
@option{tx}: the filter is attached to the transmit queue of the netdev,
where it will receive packets sent by the netdev.
+@item -object
filter-mirror,id=@var{id},netdev=@var{netdevid},outdev=@var{chardevid}[,queue=@var{all|rx|tx}]
+
+filter-mirror on netdev @var{netdevid},mirror net packet to chardev
+@var{chardevid}
+
@item -object
filter-dump,id=@var{id},netdev=@var{dev},file=@var{filename}][,maxlen=@var{len}]
Dump the network traffic on netdev @var{dev} to the file specified by
diff --git a/vl.c b/vl.c
index 175ebcc..d68533a 100644
--- a/vl.c
+++ b/vl.c
@@ -2798,7 +2798,8 @@ static bool object_create_initial(const char *type)
* they depend on netdevs already existing
*/
if (g_str_equal(type, "filter-buffer") ||
- g_str_equal(type, "filter-dump")) {
+ g_str_equal(type, "filter-dump") ||
+ g_str_equal(type, "filter-mirror")) {
return false;
}
--
1.9.1
