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[Qemu-devel] [PATCH V15 08/12] filter-rewriter: introduce filter-rewrite
From: |
Zhang Chen |
Subject: |
[Qemu-devel] [PATCH V15 08/12] filter-rewriter: introduce filter-rewriter initialization |
Date: |
Tue, 27 Sep 2016 10:22:32 +0800 |
Filter-rewriter is a part of COLO project.
It will rewrite some of secondary packet to make
secondary guest's tcp connection established successfully.
In this module we will rewrite tcp packet's ack to the secondary
from primary,and rewrite tcp packet's seq to the primary from
secondary.
usage:
colo secondary:
-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0
-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1
-object filter-rewriter,id=rew0,netdev=hn0,queue=all
Signed-off-by: Zhang Chen <address@hidden>
Signed-off-by: Li Zhijian <address@hidden>
Signed-off-by: Wen Congyang <address@hidden>
---
net/Makefile.objs | 1 +
net/filter-rewriter.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-options.hx | 13 +++++++
vl.c | 3 +-
4 files changed, 121 insertions(+), 1 deletion(-)
create mode 100644 net/filter-rewriter.c
diff --git a/net/Makefile.objs b/net/Makefile.objs
index beb504b..2a80df5 100644
--- a/net/Makefile.objs
+++ b/net/Makefile.objs
@@ -18,3 +18,4 @@ common-obj-y += filter-buffer.o
common-obj-y += filter-mirror.o
common-obj-y += colo-compare.o
common-obj-y += colo.o
+common-obj-y += filter-rewriter.o
diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c
new file mode 100644
index 0000000..de29f07
--- /dev/null
+++ b/net/filter-rewriter.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ * Copyright (c) 2016 FUJITSU LIMITED
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Author: Zhang Chen <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later. See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "net/colo.h"
+#include "net/filter.h"
+#include "net/net.h"
+#include "qemu-common.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qerror.h"
+#include "qapi-visit.h"
+#include "qom/object.h"
+#include "qemu/main-loop.h"
+#include "qemu/iov.h"
+#include "net/checksum.h"
+
+#define FILTER_COLO_REWRITER(obj) \
+ OBJECT_CHECK(RewriterState, (obj), TYPE_FILTER_REWRITER)
+
+#define TYPE_FILTER_REWRITER "filter-rewriter"
+
+typedef struct RewriterState {
+ NetFilterState parent_obj;
+ NetQueue *incoming_queue;
+ /* hashtable to save connection */
+ GHashTable *connection_track_table;
+} RewriterState;
+
+static void filter_rewriter_flush(NetFilterState *nf)
+{
+ RewriterState *s = FILTER_COLO_REWRITER(nf);
+
+ if (!qemu_net_queue_flush(s->incoming_queue)) {
+ /* Unable to empty the queue, purge remaining packets */
+ qemu_net_queue_purge(s->incoming_queue, nf->netdev);
+ }
+}
+
+static ssize_t colo_rewriter_receive_iov(NetFilterState *nf,
+ NetClientState *sender,
+ unsigned flags,
+ const struct iovec *iov,
+ int iovcnt,
+ NetPacketSent *sent_cb)
+{
+ /*
+ * if we get tcp packet
+ * we will rewrite it to make secondary guest's
+ * connection established successfully
+ */
+ return 0;
+}
+
+static void colo_rewriter_cleanup(NetFilterState *nf)
+{
+ RewriterState *s = FILTER_COLO_REWRITER(nf);
+
+ /* flush packets */
+ if (s->incoming_queue) {
+ filter_rewriter_flush(nf);
+ g_free(s->incoming_queue);
+ }
+}
+
+static void colo_rewriter_setup(NetFilterState *nf, Error **errp)
+{
+ RewriterState *s = FILTER_COLO_REWRITER(nf);
+
+ s->connection_track_table = g_hash_table_new_full(connection_key_hash,
+ connection_key_equal,
+ g_free,
+ connection_destroy);
+ s->incoming_queue = qemu_new_net_queue(qemu_netfilter_pass_to_next, nf);
+}
+
+static void colo_rewriter_class_init(ObjectClass *oc, void *data)
+{
+ NetFilterClass *nfc = NETFILTER_CLASS(oc);
+
+ nfc->setup = colo_rewriter_setup;
+ nfc->cleanup = colo_rewriter_cleanup;
+ nfc->receive_iov = colo_rewriter_receive_iov;
+}
+
+static const TypeInfo colo_rewriter_info = {
+ .name = TYPE_FILTER_REWRITER,
+ .parent = TYPE_NETFILTER,
+ .class_init = colo_rewriter_class_init,
+ .instance_size = sizeof(RewriterState),
+};
+
+static void register_types(void)
+{
+ type_register_static(&colo_rewriter_info);
+}
+
+type_init(register_types);
diff --git a/qemu-options.hx b/qemu-options.hx
index 87fbba3..5cd50a8 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3880,6 +3880,19 @@ Create a filter-redirector we need to differ outdev id
from indev id, id can not
be the same. we can just use indev or outdev, but at least one of indev or
outdev
need to be specified.
address@hidden -object
filter-rewriter,address@hidden,address@hidden,address@hidden,address@hidden|rx|tx}]
+
+Filter-rewriter is a part of COLO project.It will rewrite tcp packet to
+secondary from primary to keep secondary tcp connection,and rewrite
+tcp packet to primary from secondary make tcp packet can be handled by
+client.
+
+usage:
+colo secondary:
+-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0
+-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1
+-object filter-rewriter,id=rew0,netdev=hn0,queue=all
+
@item -object
filter-dump,address@hidden,address@hidden,address@hidden,address@hidden
Dump the network traffic on netdev @var{dev} to the file specified by
diff --git a/vl.c b/vl.c
index e73a1d1..cda24ce 100644
--- a/vl.c
+++ b/vl.c
@@ -2807,7 +2807,8 @@ static bool object_create_initial(const char *type)
g_str_equal(type, "filter-dump") ||
g_str_equal(type, "filter-mirror") ||
g_str_equal(type, "filter-redirector") ||
- g_str_equal(type, "colo-compare")) {
+ g_str_equal(type, "colo-compare") ||
+ g_str_equal(type, "filter-rewriter")) {
return false;
}
--
2.7.4
- [Qemu-devel] [PATCH V15 00/12] Introduce COLO-Proxy, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 04/12] Jhash: add linux kernel jhashtable in qemu, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 01/12] qemu-char: Add qemu_chr_add_handlers_full() for GMaincontext, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 09/12] filter-rewriter: track connection and parse packet, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 07/12] colo-compare: add TCP, UDP, ICMP packet comparison, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 03/12] net/colo.c: add colo.c to define and handle packet, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 06/12] colo-compare: introduce packet comparison thread, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 08/12] filter-rewriter: introduce filter-rewriter initialization,
Zhang Chen <=
- [Qemu-devel] [PATCH V15 11/12] MAINTAINERS: add maintainer for COLO-proxy, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 05/12] colo-compare: track connection and enqueue packet, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 02/12] colo-compare: introduce colo compare initialization, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 12/12] docs: Add documentation for COLO-proxy, Zhang Chen, 2016/09/26
- [Qemu-devel] [PATCH V15 10/12] filter-rewriter: rewrite tcp packet to keep secondary connection, Zhang Chen, 2016/09/26
- Re: [Qemu-devel] [PATCH V15 00/12] Introduce COLO-Proxy, Jason Wang, 2016/09/27
- Re: [Qemu-devel] [PATCH V15 00/12] Introduce COLO-Proxy, Paolo Bonzini, 2016/09/30