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 "qemu/typedefs.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 struct NetFilterClass {
  40     ObjectClass parent_class;
  41
  42     /* optional */
  43     FilterSetup *setup;
  44     FilterCleanup *cleanup;
  45     /* mandatory */
  46     FilterReceiveIOV *receive_iov;
  47 } NetFilterClass;
  48
  49
  50 struct NetFilterState {
  51     /* private */
  52     Object parent;
  53
  54     /* protected */
  55     char *netdev_id;
  56     NetClientState *netdev;
  57     NetFilterDirection direction;
  58     char info_str[256];
  59     QTAILQ_ENTRY(NetFilterState) next;
  60 };
  61
  62 ssize_t qemu_netfilter_receive(NetFilterState *nf,
  63                                NetFilterDirection direction,
  64                                NetClientState *sender,
  65                                unsigned flags,
  66                                const struct iovec *iov,
  67                                int iovcnt,
  68                                NetPacketSent *sent_cb);
  69
  70 /* pass the packet to the next filter */
  71 ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
  72                                     unsigned flags,
  73                                     const struct iovec *iov,
  74                                     int iovcnt,
  75                                     void *opaque);
  76
  77 #endif /* QEMU_NET_FILTER_H */