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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>
This commit is contained in:
zhanghailiang 2017-02-28 11:54:19 +08:00 committed by Jason Wang
parent 0e79668e1f
commit db0a762e4b
1 changed files with 11 additions and 6 deletions
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17
net/filter-rewriter.c
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@ -93,10 +93,12 @@ static int handle_primary_tcp_pkt(NetFilterState *nf,
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 @@ static int handle_secondary_tcp_pkt(NetFilterState *nf,
}
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;