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From: | Jason Wang |
Subject: | Re: [Qemu-devel] [RFC PATCH V3 3/3] filter-rewriter: rewrite tcp packet to keep secondary connection |
Date: | Thu, 28 Jul 2016 10:04:57 +0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
On 2016年07月27日 17:05, Zhang Chen wrote:
+ if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == TH_ACK)) { + if (conn->syn_flag) { + /* offset = secondary_seq - primary seq */ + conn->offset -= (ntohl(tcp_pkt->th_ack) - 1);The code here is conflict with your comment above. Why need - 1 here?(ntohl(tcp_pkt->th_ack) - 1) is the primary seq So, we need -1 here. Thanks Zhang Chen
Aha, right. Since we can't get the syn,ack packet sent by guest from primary node.
Better add a comment to explain this. Thanks
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