filter-rewriter: introduce filter-rewriter initialization
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 <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2016-09-27 04:22:32 +02:00
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/*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "net/colo.h"
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#include "net/filter.h"
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#include "net/net.h"
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qapi-visit.h"
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#include "qom/object.h"
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#include "qemu/main-loop.h"
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#include "qemu/iov.h"
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#include "net/checksum.h"
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#define FILTER_COLO_REWRITER(obj) \
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OBJECT_CHECK(RewriterState, (obj), TYPE_FILTER_REWRITER)
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#define TYPE_FILTER_REWRITER "filter-rewriter"
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typedef struct RewriterState {
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NetFilterState parent_obj;
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NetQueue *incoming_queue;
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/* hashtable to save connection */
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GHashTable *connection_track_table;
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} RewriterState;
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static void filter_rewriter_flush(NetFilterState *nf)
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{
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RewriterState *s = FILTER_COLO_REWRITER(nf);
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if (!qemu_net_queue_flush(s->incoming_queue)) {
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/* Unable to empty the queue, purge remaining packets */
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qemu_net_queue_purge(s->incoming_queue, nf->netdev);
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}
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}
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2016-09-27 04:22:33 +02:00
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/*
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* Return 1 on success, if return 0 means the pkt
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* is not TCP packet
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*/
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static int is_tcp_packet(Packet *pkt)
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{
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if (!parse_packet_early(pkt) &&
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pkt->ip->ip_p == IPPROTO_TCP) {
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return 1;
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} else {
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return 0;
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}
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}
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filter-rewriter: introduce filter-rewriter initialization
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 <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2016-09-27 04:22:32 +02:00
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static ssize_t colo_rewriter_receive_iov(NetFilterState *nf,
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NetClientState *sender,
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unsigned flags,
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const struct iovec *iov,
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int iovcnt,
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NetPacketSent *sent_cb)
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{
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2016-09-27 04:22:33 +02:00
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RewriterState *s = FILTER_COLO_REWRITER(nf);
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Connection *conn;
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ConnectionKey key;
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Packet *pkt;
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ssize_t size = iov_size(iov, iovcnt);
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char *buf = g_malloc0(size);
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iov_to_buf(iov, iovcnt, 0, buf, size);
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pkt = packet_new(buf, size);
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filter-rewriter: introduce filter-rewriter initialization
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 <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2016-09-27 04:22:32 +02:00
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/*
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* if we get tcp packet
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* we will rewrite it to make secondary guest's
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* connection established successfully
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*/
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2016-09-27 04:22:33 +02:00
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if (pkt && is_tcp_packet(pkt)) {
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fill_connection_key(pkt, &key);
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if (sender == nf->netdev) {
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/*
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* We need make tcp TX and RX packet
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* into one connection.
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*/
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reverse_connection_key(&key);
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}
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conn = connection_get(s->connection_track_table,
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&key,
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NULL);
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if (sender == nf->netdev) {
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/* NET_FILTER_DIRECTION_TX */
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/* handle_primary_tcp_pkt */
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} else {
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/* NET_FILTER_DIRECTION_RX */
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/* handle_secondary_tcp_pkt */
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}
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}
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packet_destroy(pkt, NULL);
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pkt = NULL;
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filter-rewriter: introduce filter-rewriter initialization
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 <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2016-09-27 04:22:32 +02:00
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return 0;
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}
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static void colo_rewriter_cleanup(NetFilterState *nf)
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{
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RewriterState *s = FILTER_COLO_REWRITER(nf);
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/* flush packets */
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if (s->incoming_queue) {
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filter_rewriter_flush(nf);
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g_free(s->incoming_queue);
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}
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}
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static void colo_rewriter_setup(NetFilterState *nf, Error **errp)
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{
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RewriterState *s = FILTER_COLO_REWRITER(nf);
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s->connection_track_table = g_hash_table_new_full(connection_key_hash,
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connection_key_equal,
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g_free,
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connection_destroy);
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s->incoming_queue = qemu_new_net_queue(qemu_netfilter_pass_to_next, nf);
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}
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static void colo_rewriter_class_init(ObjectClass *oc, void *data)
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{
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NetFilterClass *nfc = NETFILTER_CLASS(oc);
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nfc->setup = colo_rewriter_setup;
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nfc->cleanup = colo_rewriter_cleanup;
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nfc->receive_iov = colo_rewriter_receive_iov;
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}
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static const TypeInfo colo_rewriter_info = {
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.name = TYPE_FILTER_REWRITER,
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.parent = TYPE_NETFILTER,
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.class_init = colo_rewriter_class_init,
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.instance_size = sizeof(RewriterState),
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};
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static void register_types(void)
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{
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type_register_static(&colo_rewriter_info);
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}
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type_init(register_types);
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