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 QTAILQ_ENTRY(NetFilterState) next; 59 }; 60 61 ssize_t qemu_netfilter_receive(NetFilterState *nf, 62 NetFilterDirection direction, 63 NetClientState *sender, 64 unsigned flags, 65 const struct iovec *iov, 66 int iovcnt, 67 NetPacketSent *sent_cb); 68 69 /* pass the packet to the next filter */ 70 ssize_t qemu_netfilter_pass_to_next(NetClientState *sender, 71 unsigned flags, 72 const struct iovec *iov, 73 int iovcnt, 74 void *opaque); 75 76 #endif /* QEMU_NET_FILTER_H */ 77