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authorZhang Chen <zhangchen.fnst@cn.fujitsu.com>2016-09-27 10:22:27 +0800
committerJason Wang <jasowang@redhat.com>2016-09-27 17:54:21 +0800
commit59509ec16b7ee92b3f8261c554023aa1d3169317 (patch)
tree5fdbb7063df65a31a3c6c50cfad42b49c0859a67 /net/colo.c
parent7dce4e6fd2baa4935074fa03736588017c1a8b84 (diff)
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net/colo.c: add colo.c to define and handle packet
The net/colo.c is used by colo-compare and filter-rewriter. this can share common data structure like net packet, and other functions. 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>
Diffstat (limited to 'net/colo.c')
-rw-r--r--net/colo.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/net/colo.c b/net/colo.c
new file mode 100644
index 0000000..8582175
--- /dev/null
+++ b/net/colo.c
@@ -0,0 +1,86 @@
+/*
+ * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
+ * (a.k.a. Fault Tolerance or Continuous Replication)
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ * Copyright (c) 2016 FUJITSU LIMITED
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
+ *
+ * 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 "trace.h"
+#include "net/colo.h"
+
+int parse_packet_early(Packet *pkt)
+{
+ int network_length;
+ static const uint8_t vlan[] = {0x81, 0x00};
+ uint8_t *data = pkt->data;
+ uint16_t l3_proto;
+ ssize_t l2hdr_len = eth_get_l2_hdr_length(data);
+
+ if (pkt->size < ETH_HLEN) {
+ trace_colo_proxy_main("pkt->size < ETH_HLEN");
+ return 1;
+ }
+
+ /*
+ * TODO: support vlan.
+ */
+ if (!memcmp(&data[12], vlan, sizeof(vlan))) {
+ trace_colo_proxy_main("COLO-proxy don't support vlan");
+ return 1;
+ }
+
+ pkt->network_header = data + l2hdr_len;
+
+ const struct iovec l2vec = {
+ .iov_base = (void *) data,
+ .iov_len = l2hdr_len
+ };
+ l3_proto = eth_get_l3_proto(&l2vec, 1, l2hdr_len);
+
+ if (l3_proto != ETH_P_IP) {
+ return 1;
+ }
+
+ network_length = pkt->ip->ip_hl * 4;
+ if (pkt->size < l2hdr_len + network_length) {
+ trace_colo_proxy_main("pkt->size < network_header + network_length");
+ return 1;
+ }
+ pkt->transport_header = pkt->network_header + network_length;
+
+ return 0;
+}
+
+Packet *packet_new(const void *data, int size)
+{
+ Packet *pkt = g_slice_new(Packet);
+
+ pkt->data = g_memdup(data, size);
+ pkt->size = size;
+
+ return pkt;
+}
+
+void packet_destroy(void *opaque, void *user_data)
+{
+ Packet *pkt = opaque;
+
+ g_free(pkt->data);
+ g_slice_free(Packet, pkt);
+}
+
+/*
+ * Clear hashtable, stop this hash growing really huge
+ */
+void connection_hashtable_reset(GHashTable *connection_track_table)
+{
+ g_hash_table_remove_all(connection_track_table);
+}