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[Qemu-devel] [PATCH v10 03/10] netfilter: hook packets before net queue
From: |
Yang Hongyang |
Subject: |
[Qemu-devel] [PATCH v10 03/10] netfilter: hook packets before net queue send |
Date: |
Wed, 9 Sep 2015 15:24:34 +0800 |
Capture packets that will be sent.
Signed-off-by: Yang Hongyang <address@hidden>
Reviewed-by: Thomas Huth <address@hidden>
---
v10: adjust due to QOM
v5: do not check ret against iov_size
pass sent_cb to filters
---
net/net.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/net/net.c b/net/net.c
index d6d4db8..1f46ad0 100644
--- a/net/net.c
+++ b/net/net.c
@@ -44,6 +44,7 @@
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
#include "sysemu/sysemu.h"
+#include "net/filter.h"
/* Net bridge is currently not supported for W32. */
#if !defined(_WIN32)
@@ -560,6 +561,44 @@ int qemu_can_send_packet(NetClientState *sender)
return 1;
}
+static ssize_t filter_receive_iov(NetClientState *nc, NetFilterChain chain,
+ NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt,
+ NetPacketSent *sent_cb)
+{
+ ssize_t ret = 0;
+ NetFilterState *nf = NULL;
+
+ QTAILQ_FOREACH(nf, &nc->filters, next) {
+ if (nf->chain == chain || nf->chain == NET_FILTER_CHAIN_ALL) {
+ ret = NETFILTER_GET_CLASS(OBJECT(nf))->receive_iov(
+ nf, sender, flags, iov, iovcnt, sent_cb);
+ if (ret) {
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static ssize_t filter_receive(NetClientState *nc, NetFilterChain chain,
+ NetClientState *sender,
+ unsigned flags,
+ const uint8_t *data,
+ size_t size,
+ NetPacketSent *sent_cb)
+{
+ struct iovec iov = {
+ .iov_base = (void *)data,
+ .iov_len = size
+ };
+
+ return filter_receive_iov(nc, chain, sender, flags, &iov, 1, sent_cb);
+}
+
ssize_t qemu_deliver_packet(NetClientState *sender,
unsigned flags,
const uint8_t *data,
@@ -631,6 +670,7 @@ static ssize_t
qemu_send_packet_async_with_flags(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ int ret;
#ifdef DEBUG_NET
printf("qemu_send_packet_async:\n");
@@ -641,6 +681,19 @@ static ssize_t
qemu_send_packet_async_with_flags(NetClientState *sender,
return size;
}
+ /* Let filters handle the packet first */
+ ret = filter_receive(sender, NET_FILTER_CHAIN_OUT,
+ sender, flags, buf, size, sent_cb);
+ if (ret) {
+ return ret;
+ }
+
+ ret = filter_receive(sender->peer, NET_FILTER_CHAIN_IN,
+ sender, flags, buf, size, sent_cb);
+ if (ret) {
+ return ret;
+ }
+
queue = sender->peer->incoming_queue;
return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
@@ -711,11 +764,25 @@ ssize_t qemu_sendv_packet_async(NetClientState *sender,
NetPacketSent *sent_cb)
{
NetQueue *queue;
+ int ret;
if (sender->link_down || !sender->peer) {
return iov_size(iov, iovcnt);
}
+ /* Let filters handle the packet first */
+ ret = filter_receive_iov(sender, NET_FILTER_CHAIN_OUT, sender,
+ QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
+ if (ret) {
+ return ret;
+ }
+
+ ret = filter_receive_iov(sender->peer, NET_FILTER_CHAIN_IN, sender,
+ QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
+ if (ret) {
+ return ret;
+ }
+
queue = sender->peer->incoming_queue;
return qemu_net_queue_send_iov(queue, sender,
--
1.9.1
- [Qemu-devel] [PATCH v10 00/10] Add a netfilter object and netbuffer filter, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 01/10] qmp: delete qemu opts when delete an object, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 04/10] net: merge qemu_deliver_packet and qemu_deliver_packet_iov, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 03/10] netfilter: hook packets before net queue send,
Yang Hongyang <=
- [Qemu-devel] [PATCH v10 02/10] init/cleanup of netfilter object, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 06/10] netfilter: add an API to pass the packet to next filter, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 10/10] tests: add test cases for netfilter object, Yang Hongyang, 2015/09/09
- [Qemu-devel] [PATCH v10 07/10] netfilter: print filter info associate with the netdev, Yang Hongyang, 2015/09/09