Re: [Qemu-devel] [PATCH V4 10/12] net/colo-compare.c: Add vnet packet's tcp/udp/icmp compare

[Jason Wang]

On 2017年05月12日 09:41, Zhang Chen wrote:

COLO-Proxy just focus on packet payload, So we skip vnet header.

Signed-off-by: Zhang Chen <zhangchen.f...@cn.fujitsu.com>
---
  net/colo-compare.c | 12 +++++++++---
  1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index cb0b04e..bf565f3 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -188,6 +188,8 @@ static int packet_enqueue(CompareState *s, int mode)
   */
  static int colo_packet_compare_common(Packet *ppkt, Packet *spkt, int offset)
  {
+    int offset_all;
+
      if (trace_event_get_state(TRACE_COLO_COMPARE_MISCOMPARE)) {
          char pri_ip_src[20], pri_ip_dst[20], sec_ip_src[20], sec_ip_dst[20];

@@ -201,9 +203,12 @@ static int colo_packet_compare_common(Packet *ppkt, Packet *spkt, int offset)

                                     sec_ip_src, sec_ip_dst);
      }

+ offset_all = ppkt->vnet_hdr_len + offset;

How about just keep using offset by increasing it with vnet_hdr_len?

Thanks

+
      if (ppkt->size == spkt->size) {
-        return memcmp(ppkt->data + offset, spkt->data + offset,
-                      spkt->size - offset);
+        return memcmp(ppkt->data + offset_all,
+                      spkt->data + offset_all,
+                      spkt->size - offset_all);
      } else {
          trace_colo_compare_main("Net packet size are not the same");
          return -1;
@@ -261,8 +266,9 @@ static int colo_packet_compare_tcp(Packet *spkt, Packet 
*ppkt)
       */
      if (ptcp->th_off > 5) {
          ptrdiff_t tcp_offset;
+
          tcp_offset = ppkt->transport_header - (uint8_t *)ppkt->data
-                     + (ptcp->th_off * 4);
+                     + (ptcp->th_off * 4) - ppkt->vnet_hdr_len;
          res = colo_packet_compare_common(ppkt, spkt, tcp_offset);
      } else if (ptcp->th_sum == stcp->th_sum) {
          res = colo_packet_compare_common(ppkt, spkt, ETH_HLEN);