338d3f415e
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>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* Copyright (c) 2015 FUJITSU LIMITED
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* Author: Yang Hongyang <yanghy@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#ifndef QEMU_NET_FILTER_H
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#define QEMU_NET_FILTER_H
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#include "qom/object.h"
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#include "qemu-common.h"
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#include "qemu/typedefs.h"
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#include "net/queue.h"
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#define TYPE_NETFILTER "netfilter"
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#define NETFILTER(obj) \
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OBJECT_CHECK(NetFilterState, (obj), TYPE_NETFILTER)
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#define NETFILTER_GET_CLASS(obj) \
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OBJECT_GET_CLASS(NetFilterClass, (obj), TYPE_NETFILTER)
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#define NETFILTER_CLASS(klass) \
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OBJECT_CLASS_CHECK(NetFilterClass, (klass), TYPE_NETFILTER)
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typedef void (FilterSetup) (NetFilterState *nf, Error **errp);
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typedef void (FilterCleanup) (NetFilterState *nf);
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/*
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* Return:
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* 0: finished handling the packet, we should continue
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* size: filter stolen this packet, we stop pass this packet further
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*/
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typedef ssize_t (FilterReceiveIOV)(NetFilterState *nc,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb);
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typedef void (FilterStatusChanged) (NetFilterState *nf, Error **errp);
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typedef struct NetFilterClass {
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ObjectClass parent_class;
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/* optional */
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FilterSetup *setup;
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FilterCleanup *cleanup;
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FilterStatusChanged *status_changed;
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/* mandatory */
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FilterReceiveIOV *receive_iov;
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} NetFilterClass;
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struct NetFilterState {
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/* private */
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Object parent;
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/* protected */
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char *netdev_id;
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NetClientState *netdev;
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NetFilterDirection direction;
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bool on;
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QTAILQ_ENTRY(NetFilterState) next;
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};
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ssize_t qemu_netfilter_receive(NetFilterState *nf,
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NetFilterDirection direction,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb);
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/* pass the packet to the next filter */
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ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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void *opaque);
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#endif /* QEMU_NET_FILTER_H */
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