@@ -26,12 +26,23 @@
#define FILTER_MIRROR(obj) \
OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_MIRROR)
+#define FILTER_REDIRECTOR(obj) \
+ OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_REDIRECTOR)
+
#define TYPE_FILTER_MIRROR "filter-mirror"
+#define TYPE_FILTER_REDIRECTOR "filter-redirector"
+#define REDIRECTOR_MAX_LEN NET_BUFSIZE
typedef struct MirrorState {
NetFilterState parent_obj;
+ char *indev;
char *outdev;
+ CharDriverState *chr_in;
CharDriverState *chr_out;
+ int state; /* 0 = getting length, 1 = getting data */
+ unsigned int index;
+ unsigned int packet_len;
+ uint8_t buf[REDIRECTOR_MAX_LEN];
} MirrorState;
static int filter_mirror_send(CharDriverState *chr_out,
@@ -68,6 +79,96 @@ err:
return ret < 0 ? ret : -EIO;
}
+static void
+redirector_to_filter(NetFilterState *nf, const uint8_t *buf, int len)
+{
+ struct iovec iov = {
+ .iov_base = (void *)buf,
+ .iov_len = len,
+ };
+
+ if (nf->direction == NET_FILTER_DIRECTION_ALL ||
+ nf->direction == NET_FILTER_DIRECTION_TX) {
+ qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf);
+ }
+
+ if (nf->direction == NET_FILTER_DIRECTION_ALL ||
+ nf->direction == NET_FILTER_DIRECTION_RX) {
+ qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf);
+ }
+}
+
+static int redirector_chr_can_read(void *opaque)
+{
+ return REDIRECTOR_MAX_LEN;
+}
+
+static void redirector_chr_read(void *opaque, const uint8_t *buf, int size)
+{
+ NetFilterState *nf = opaque;
+ MirrorState *s = FILTER_REDIRECTOR(nf);
+ unsigned int l;
+
+ while (size > 0) {
+ /* reassemble a packet from the network */
+ switch (s->state) { /* 0 = getting length, 1 = getting data */
+ case 0:
+ l = 4 - s->index;
+ if (l > size) {
+ l = size;
+ }
+ memcpy(s->buf + s->index, buf, l);
+ buf += l;
+ size -= l;
+ s->index += l;
+ if (s->index == 4) {
+ /* got length */
+ s->packet_len = ntohl(*(uint32_t *)s->buf);
+ s->index = 0;
+ s->state = 1;
+ }
+ break;
+ case 1:
+ l = s->packet_len - s->index;
+ if (l > size) {
+ l = size;
+ }
+ if (s->index + l <= sizeof(s->buf)) {
+ memcpy(s->buf + s->index, buf, l);
+ } else {
+ error_report("serious error: oversized packet received.");
+ s->index = s->state = 0;
+ qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
+ return;
+ }
+
+ s->index += l;
+ buf += l;
+ size -= l;
+ if (s->index >= s->packet_len) {
+ s->index = 0;
+ s->state = 0;
+ redirector_to_filter(nf, s->buf, s->packet_len);
+ }
+ break;
+ }
+ }
+}
+
+static void redirector_chr_event(void *opaque, int event)
+{
+ NetFilterState *nf = opaque;
+ MirrorState *s = FILTER_REDIRECTOR(nf);
+
+ switch (event) {
+ case CHR_EVENT_CLOSED:
+ qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
+ break;
+ default:
+ break;
+ }
+}
+
static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
NetClientState *sender,
unsigned flags,
@@ -90,6 +191,27 @@ static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
return 0;
}
+static ssize_t filter_redirector_receive_iov(NetFilterState *nf,
+ NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt,
+ NetPacketSent *sent_cb)
+{
+ MirrorState *s = FILTER_REDIRECTOR(nf);
+ int ret;
+
+ if (s->chr_out) {
+ ret = filter_mirror_send(s->chr_out, iov, iovcnt);
+ if (ret) {
+ error_report("filter_mirror_send failed(%s)", strerror(-ret));
+ }
+ return iov_size(iov, iovcnt);
+ } else {
+ return 0;
+ }
+}
+
static void filter_mirror_cleanup(NetFilterState *nf)
{
MirrorState *s = FILTER_MIRROR(nf);
@@ -99,6 +221,19 @@ static void filter_mirror_cleanup(NetFilterState *nf)
}
}
+static void filter_redirector_cleanup(NetFilterState *nf)
+{
+ MirrorState *s = FILTER_REDIRECTOR(nf);
+
+ if (s->chr_in) {
+ qemu_chr_add_handlers(s->chr_in, NULL, NULL, NULL, NULL);
+ qemu_chr_fe_release(s->chr_in);
+ }
+ 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);
@@ -122,6 +257,48 @@ static void filter_mirror_setup(NetFilterState *nf, Error **errp)
}
}
+static void filter_redirector_setup(NetFilterState *nf, Error **errp)
+{
+ MirrorState *s = FILTER_REDIRECTOR(nf);
+
+ if (!s->indev && !s->outdev) {
+ error_setg(errp, "filter redirector needs 'indev' or "
+ "'outdev' at least one property set");
+ return;
+ } else if (s->indev && s->outdev) {
+ if (!strcmp(s->indev, s->outdev)) {
+ error_setg(errp, "'indev' and 'outdev' could not be same "
+ "for filter redirector");
+ return;
+ }
+ }
+
+ s->state = s->index = 0;
+
+ if (s->indev) {
+ s->chr_in = qemu_chr_find(s->indev);
+ if (s->chr_in == NULL) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "IN Device '%s' not found", s->indev);
+ return;
+ }
+
+ qemu_chr_fe_claim_no_fail(s->chr_in);
+ qemu_chr_add_handlers(s->chr_in, redirector_chr_can_read,
+ redirector_chr_read, redirector_chr_event, nf);
+ }
+
+ if (s->outdev) {
+ s->chr_out = qemu_chr_find(s->outdev);
+ if (s->chr_out == NULL) {
+ error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+ "OUT Device '%s' not found", s->outdev);
+ return;
+ }
+ qemu_chr_fe_claim_no_fail(s->chr_out);
+ }
+}
+
static void filter_mirror_class_init(ObjectClass *oc, void *data)
{
NetFilterClass *nfc = NETFILTER_CLASS(oc);
@@ -131,6 +308,31 @@ static void filter_mirror_class_init(ObjectClass *oc, void *data)
nfc->receive_iov = filter_mirror_receive_iov;
}
+static void filter_redirector_class_init(ObjectClass *oc, void *data)
+{
+ NetFilterClass *nfc = NETFILTER_CLASS(oc);
+
+ nfc->setup = filter_redirector_setup;
+ nfc->cleanup = filter_redirector_cleanup;
+ nfc->receive_iov = filter_redirector_receive_iov;
+}
+
+static char *filter_redirector_get_indev(Object *obj, Error **errp)
+{
+ MirrorState *s = FILTER_REDIRECTOR(obj);
+
+ return g_strdup(s->indev);
+}
+
+static void
+filter_redirector_set_indev(Object *obj, const char *value, Error **errp)
+{
+ MirrorState *s = FILTER_REDIRECTOR(obj);
+
+ g_free(s->indev);
+ s->indev = g_strdup(value);
+}
+
static char *filter_mirror_get_outdev(Object *obj, Error **errp)
{
MirrorState *s = FILTER_MIRROR(obj);
@@ -152,12 +354,36 @@ filter_mirror_set_outdev(Object *obj, const char *value, Error **errp)
}
}
+static char *filter_redirector_get_outdev(Object *obj, Error **errp)
+{
+ MirrorState *s = FILTER_REDIRECTOR(obj);
+
+ return g_strdup(s->outdev);
+}
+
+static void
+filter_redirector_set_outdev(Object *obj, const char *value, Error **errp)
+{
+ MirrorState *s = FILTER_REDIRECTOR(obj);
+
+ g_free(s->outdev);
+ s->outdev = g_strdup(value);
+}
+
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_redirector_init(Object *obj)
+{
+ object_property_add_str(obj, "indev", filter_redirector_get_indev,
+ filter_redirector_set_indev, NULL);
+ object_property_add_str(obj, "outdev", filter_redirector_get_outdev,
+ filter_redirector_set_outdev, NULL);
+}
+
static void filter_mirror_fini(Object *obj)
{
MirrorState *s = FILTER_MIRROR(obj);
@@ -165,6 +391,23 @@ static void filter_mirror_fini(Object *obj)
g_free(s->outdev);
}
+static void filter_redirector_fini(Object *obj)
+{
+ MirrorState *s = FILTER_REDIRECTOR(obj);
+
+ g_free(s->indev);
+ g_free(s->outdev);
+}
+
+static const TypeInfo filter_redirector_info = {
+ .name = TYPE_FILTER_REDIRECTOR,
+ .parent = TYPE_NETFILTER,
+ .class_init = filter_redirector_class_init,
+ .instance_init = filter_redirector_init,
+ .instance_finalize = filter_redirector_fini,
+ .instance_size = sizeof(MirrorState),
+};
+
static const TypeInfo filter_mirror_info = {
.name = TYPE_FILTER_MIRROR,
.parent = TYPE_NETFILTER,
@@ -177,6 +420,7 @@ static const TypeInfo filter_mirror_info = {
static void register_types(void)
{
type_register_static(&filter_mirror_info);
+ type_register_static(&filter_redirector_info);
}
type_init(register_types);
@@ -3821,6 +3821,15 @@ queue @var{all|rx|tx} is an option that can be applied to any netfilter.
filter-mirror on netdev @var{netdevid},mirror net packet to chardev
@var{chardevid}
+@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},
+outdev=@var{chardevid}[,queue=@var{all|rx|tx}]
+
+filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev
+@var{chardevid},and redirect indev's packet to filter.
+Create a filter-redirector we need to differ outdev id from indev id, id can not
+be the same. we can just use indev or outdev, but at least one of indev or outdev
+need to be specified.
+
@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
@@ -2841,7 +2841,8 @@ static bool object_create_initial(const char *type)
*/
if (g_str_equal(type, "filter-buffer") ||
g_str_equal(type, "filter-dump") ||
- g_str_equal(type, "filter-mirror")) {
+ g_str_equal(type, "filter-mirror") ||
+ g_str_equal(type, "filter-redirector")) {
return false;
}
Filter-redirector is a netfilter plugin. It gives qemu the ability to redirect net packet. redirector can redirect filter's net packet to outdev. and redirect indev's packet to filter. filter + redirector | +--------------+ | | | indev +-----------+ +----------> outdev | | | +--------------+ | v filter usage: -netdev user,id=hn0 -chardev socket,id=s0,host=ip_primary,port=X,server,nowait -chardev socket,id=s1,host=ip_primary,port=Y,server,nowait -filter-redirector,id=r0,netdev=hn0,queue=tx/rx/all,indev=s0,outdev=s1 Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> --- net/filter-mirror.c | 244 ++++++++++++++++++++++++++++++++++++++++++++++++++++ qemu-options.hx | 9 ++ vl.c | 3 +- 3 files changed, 255 insertions(+), 1 deletion(-)