qemu/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 "qom/object.h"
  13 #include "qemu-common.h"
  14 #include "net/queue.h"
  15
  16 #define TYPE_NETFILTER "netfilter"
  17 #define NETFILTER(obj) \
  18     OBJECT_CHECK(NetFilterState, (obj), TYPE_NETFILTER)
  19 #define NETFILTER_GET_CLASS(obj) \
  20     OBJECT_GET_CLASS(NetFilterClass, (obj), TYPE_NETFILTER)
  21 #define NETFILTER_CLASS(klass) \
  22     OBJECT_CLASS_CHECK(NetFilterClass, (klass), TYPE_NETFILTER)
  23
  24 typedef void (FilterSetup) (NetFilterState *nf, Error **errp);
  25 typedef void (FilterCleanup) (NetFilterState *nf);
  26 /*
  27  * Return:
  28  *   0: finished handling the packet, we should continue
  29  *   size: filter stolen this packet, we stop pass this packet further
  30  */
  31 typedef ssize_t (FilterReceiveIOV)(NetFilterState *nc,
  32                                    NetClientState *sender,
  33                                    unsigned flags,
  34                                    const struct iovec *iov,
  35                                    int iovcnt,
  36                                    NetPacketSent *sent_cb);
  37
  38 typedef void (FilterStatusChanged) (NetFilterState *nf, Error **errp);
  39
  40 typedef struct NetFilterClass {
  41     ObjectClass parent_class;
  42
  43     /* optional */
  44     FilterSetup *setup;
  45     FilterCleanup *cleanup;
  46     FilterStatusChanged *status_changed;
  47     /* mandatory */
  48     FilterReceiveIOV *receive_iov;
  49 } NetFilterClass;
  50
  51
  52 struct NetFilterState {
  53     /* private */
  54     Object parent;
  55
  56     /* protected */
  57     char *netdev_id;
  58     NetClientState *netdev;
  59     NetFilterDirection direction;
  60     bool on;
  61     QTAILQ_ENTRY(NetFilterState) next;
  62 };
  63
  64 ssize_t qemu_netfilter_receive(NetFilterState *nf,
  65                                NetFilterDirection direction,
  66                                NetClientState *sender,
  67                                unsigned flags,
  68                                const struct iovec *iov,
  69                                int iovcnt,
  70                                NetPacketSent *sent_cb);
  71
  72 /* pass the packet to the next filter */
  73 ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
  74                                     unsigned flags,
  75                                     const struct iovec *iov,
  76                                     int iovcnt,
  77                                     void *opaque);
  78
  79 #endif /* QEMU_NET_FILTER_H */