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filter: Add 'status' property for filter object

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With this property, users can control if this filter is 'on'
or 'off'. The default behavior for filter is 'on'.

For some types of filters, they may need to react to status changing,
So here, we introduced status changing callback/notifier for filter class.

We will skip the disabled ('off') filter when delivering packets in net layer.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
zhanghailiang 2016-03-01 13:37:02 +08:00 • committed by Jason Wang
parent 9fe7101f1d
commit 338d3f415e
3 changed files with 48 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

41
net/filter.c
View file

@ -17,6 +17,11 @@
#include "qom/object_interfaces.h"
#include "qemu/iov.h"
static inline bool qemu_can_skip_netfilter(NetFilterState *nf)
{
return !nf->on;
}
ssize_t qemu_netfilter_receive(NetFilterState *nf,
NetFilterDirection direction,
NetClientState *sender,
@ -25,6 +30,9 @@ ssize_t qemu_netfilter_receive(NetFilterState *nf,
int iovcnt,
NetPacketSent *sent_cb)
{
if (qemu_can_skip_netfilter(nf)) {
return 0;
}
if (nf->direction == direction ||
nf->direction == NET_FILTER_DIRECTION_ALL) {
return NETFILTER_GET_CLASS(OBJECT(nf))->receive_iov(
@ -134,8 +142,38 @@ static void netfilter_set_direction(Object *obj, int direction, Error **errp)
nf->direction = direction;
}
static char *netfilter_get_status(Object *obj, Error **errp)
{
NetFilterState *nf = NETFILTER(obj);
return nf->on ? g_strdup("on") : g_strdup("off");
}
static void netfilter_set_status(Object *obj, const char *str, Error **errp)
{
NetFilterState *nf = NETFILTER(obj);
NetFilterClass *nfc = NETFILTER_GET_CLASS(obj);
if (strcmp(str, "on") && strcmp(str, "off")) {
error_setg(errp, "Invalid value for netfilter status, "
"should be 'on' or 'off'");
return;
}
if (nf->on == !strcmp(str, "on")) {
return;
}
nf->on = !nf->on;
if (nfc->status_changed) {
nfc->status_changed(nf, errp);
}
}
static void netfilter_init(Object *obj)
{
NetFilterState *nf = NETFILTER(obj);
nf->on = true;
object_property_add_str(obj, "netdev",
netfilter_get_netdev_id, netfilter_set_netdev_id,
NULL);
@ -143,6 +181,9 @@ static void netfilter_init(Object *obj)
NetFilterDirection_lookup,
netfilter_get_direction, netfilter_set_direction,
NULL);
object_property_add_str(obj, "status",
netfilter_get_status, netfilter_set_status,
NULL);
}
static void netfilter_complete(UserCreatable *uc, Error **errp)