filter-rewriter: skip net_checksum_calculate() while offset = 0
While the offset of packets's sequence for primary side and
secondary side is zero, it is unnecessary to call net_checksum_calculate()
to recalculate the checksume value of packets.
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c
index c4ab91c..afa06e8 100644
--- a/net/filter-rewriter.c
+++ b/net/filter-rewriter.c
@@ -93,10 +93,12 @@
conn->offset -= (ntohl(tcp_pkt->th_ack) - 1);
conn->syn_flag = 0;
}
- /* handle packets to the secondary from the primary */
- tcp_pkt->th_ack = htonl(ntohl(tcp_pkt->th_ack) + conn->offset);
+ if (conn->offset) {
+ /* handle packets to the secondary from the primary */
+ tcp_pkt->th_ack = htonl(ntohl(tcp_pkt->th_ack) + conn->offset);
- net_checksum_calculate((uint8_t *)pkt->data, pkt->size);
+ net_checksum_calculate((uint8_t *)pkt->data, pkt->size);
+ }
}
return 0;
@@ -129,10 +131,13 @@
}
if ((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == TH_ACK) {
- /* handle packets to the primary from the secondary*/
- tcp_pkt->th_seq = htonl(ntohl(tcp_pkt->th_seq) - conn->offset);
+ /* Only need to adjust seq while offset is Non-zero */
+ if (conn->offset) {
+ /* handle packets to the primary from the secondary*/
+ tcp_pkt->th_seq = htonl(ntohl(tcp_pkt->th_seq) - conn->offset);
- net_checksum_calculate((uint8_t *)pkt->data, pkt->size);
+ net_checksum_calculate((uint8_t *)pkt->data, pkt->size);
+ }
}
return 0;
