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netfilter: add an API to pass the packet to next filter

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add an API qemu_netfilter_pass_to_next() to pass the packet
to next filter.

Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Yang Hongyang 2015-10-07 11:52:18 +08:00 committed by Jason Wang
parent 3e033a46a7
commit 7ef7bc8586
2 changed files with 65 additions and 0 deletions
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7
include/net/filter.h
View File

@ -66,4 +66,11 @@ ssize_t qemu_netfilter_receive(NetFilterState *nf,
int iovcnt,
NetPacketSent *sent_cb);
/* pass the packet to the next filter */
ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque);
#endif /* QEMU_NET_FILTER_H */

58
net/filter.c
View File

@ -14,6 +14,7 @@
#include "net/net.h"
#include "net/vhost_net.h"
#include "qom/object_interfaces.h"
#include "qemu/iov.h"
ssize_t qemu_netfilter_receive(NetFilterState *nf,
NetFilterDirection direction,
@ -32,6 +33,63 @@ ssize_t qemu_netfilter_receive(NetFilterState *nf,
return 0;
}
ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
unsigned flags,
const struct iovec *iov,
int iovcnt,
void *opaque)
{
int ret = 0;
int direction;
NetFilterState *nf = opaque;
NetFilterState *next = QTAILQ_NEXT(nf, next);
if (!sender || !sender->peer) {
/* no receiver, or sender been deleted, no need to pass it further */
goto out;
}
if (nf->direction == NET_FILTER_DIRECTION_ALL) {
if (sender == nf->netdev) {
/* This packet is sent by netdev itself */
direction = NET_FILTER_DIRECTION_TX;
} else {
direction = NET_FILTER_DIRECTION_RX;
}
} else {
direction = nf->direction;
}
while (next) {
/*
* if qemu_netfilter_pass_to_next been called, means that
* the packet has been hold by filter and has already retured size
* to the sender, so sent_cb shouldn't be called later, just
* pass NULL to next.
*/
ret = qemu_netfilter_receive(next, direction, sender, flags, iov,
iovcnt, NULL);
if (ret) {
return ret;
}
next = QTAILQ_NEXT(next, next);
}
/*
* We have gone through all filters, pass it to receiver.
* Do the valid check again incase sender or receiver been
* deleted while we go through filters.
*/
if (sender && sender->peer) {
qemu_net_queue_send_iov(sender->peer->incoming_queue,
sender, flags, iov, iovcnt, NULL);
}
out:
/* no receiver, or sender been deleted */
return iov_size(iov, iovcnt);
}
static char *netfilter_get_netdev_id(Object *obj, Error **errp)
{
NetFilterState *nf = NETFILTER(obj);