include/net/filter.h

   1 /*
   2  * Copyright (c) 2015 FUJITSU LIMITED
   3  * Author: Yang Hongyang <yanghy@cn.fujitsu.com>
   4  *
   5  * This work is licensed under the terms of the GNU GPL, version 2 or
   6  * later.  See the COPYING file in the top-level directory.
   7  */
   8
   9 #ifndef QEMU_NET_FILTER_H
  10 #define QEMU_NET_FILTER_H
  11
  12 #include "qapi/qapi-types-net.h"
  13 #include "qom/object.h"
  14 #include "qemu-common.h"
  15 #include "net/queue.h"
  16
  17 #define TYPE_NETFILTER "netfilter"
  18 #define NETFILTER(obj) \
  19     OBJECT_CHECK(NetFilterState, (obj), TYPE_NETFILTER)
  20 #define NETFILTER_GET_CLASS(obj) \
  21     OBJECT_GET_CLASS(NetFilterClass, (obj), TYPE_NETFILTER)
  22 #define NETFILTER_CLASS(klass) \
  23     OBJECT_CLASS_CHECK(NetFilterClass, (klass), TYPE_NETFILTER)
  24
  25 typedef void (FilterSetup) (NetFilterState *nf, Error **errp);
  26 typedef void (FilterCleanup) (NetFilterState *nf);
  27 /*
  28  * Return:
  29  *   0: finished handling the packet, we should continue
  30  *   size: filter stolen this packet, we stop pass this packet further
  31  */
  32 typedef ssize_t (FilterReceiveIOV)(NetFilterState *nc,
  33                                    NetClientState *sender,
  34                                    unsigned flags,
  35                                    const struct iovec *iov,
  36                                    int iovcnt,
  37                                    NetPacketSent *sent_cb);
  38
  39 typedef void (FilterStatusChanged) (NetFilterState *nf, Error **errp);
  40
  41 typedef struct NetFilterClass {
  42     ObjectClass parent_class;
  43
  44     /* optional */
  45     FilterSetup *setup;
  46     FilterCleanup *cleanup;
  47     FilterStatusChanged *status_changed;
  48     /* mandatory */
  49     FilterReceiveIOV *receive_iov;
  50 } NetFilterClass;
  51
  52
  53 struct NetFilterState {
  54     /* private */
  55     Object parent;
  56
  57     /* protected */
  58     char *netdev_id;
  59     NetClientState *netdev;
  60     NetFilterDirection direction;
  61     bool on;
  62     QTAILQ_ENTRY(NetFilterState) next;
  63 };
  64
  65 ssize_t qemu_netfilter_receive(NetFilterState *nf,
  66                                NetFilterDirection direction,
  67                                NetClientState *sender,
  68                                unsigned flags,
  69                                const struct iovec *iov,
  70                                int iovcnt,
  71                                NetPacketSent *sent_cb);
  72
  73 /* pass the packet to the next filter */
  74 ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
  75                                     unsigned flags,
  76                                     const struct iovec *iov,
  77                                     int iovcnt,
  78                                     void *opaque);
  79
  80 #endif /* QEMU_NET_FILTER_H */