From patchwork Thu Sep 8 09:46:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Chen X-Patchwork-Id: 667692 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3sVQ4j4613z9rvt for ; Fri, 9 Sep 2016 01:59:17 +1000 (AEST) Received: from localhost ([::1]:48939 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bi1jO-0005GW-9h for incoming@patchwork.ozlabs.org; Thu, 08 Sep 2016 11:59:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57347) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bhvvF-0004uf-MD for qemu-devel@nongnu.org; Thu, 08 Sep 2016 05:47:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bhvvD-00072x-Ld for qemu-devel@nongnu.org; Thu, 08 Sep 2016 05:47:04 -0400 Received: from [59.151.112.132] (port=1831 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bhvvD-00070o-8Q for qemu-devel@nongnu.org; Thu, 08 Sep 2016 05:47:03 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="10752439" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 08 Sep 2016 17:46:30 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 71AF14042421; Thu, 8 Sep 2016 17:46:27 +0800 (CST) Received: from localhost.localdomain (10.167.226.56) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.279.2; Thu, 8 Sep 2016 17:46:27 +0800 From: Zhang Chen To: qemu devel , Jason Wang Date: Thu, 8 Sep 2016 17:46:11 +0800 Message-ID: <1473327974-21465-10-git-send-email-zhangchen.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1473327974-21465-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> References: <1473327974-21465-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.56] X-yoursite-MailScanner-ID: 71AF14042421.AD2D4 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: zhangchen.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Subject: [Qemu-devel] [PATCH V14 09/12] filter-rewriter: track connection and parse packet X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Li Zhijian , "eddie . dong" , "Dr . David Alan Gilbert" , Zhang Chen , zhanghailiang Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" We use net/colo.h to track connection and parse packet Signed-off-by: Zhang Chen Signed-off-by: Li Zhijian Signed-off-by: Wen Congyang --- net/colo.c | 14 ++++++++++++++ net/colo.h | 1 + net/filter-rewriter.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 65 insertions(+) diff --git a/net/colo.c b/net/colo.c index e517521..dc4e4a4 100644 --- a/net/colo.c +++ b/net/colo.c @@ -115,6 +115,20 @@ void fill_connection_key(Packet *pkt, ConnectionKey *key) } } +void reverse_connection_key(ConnectionKey *key) +{ + struct in_addr tmp_ip; + uint16_t tmp_port; + + tmp_ip = key->src; + key->src = key->dst; + key->dst = tmp_ip; + + tmp_port = key->src_port; + key->src_port = key->dst_port; + key->dst_port = tmp_port; +} + Connection *connection_new(ConnectionKey *key) { Connection *conn = g_slice_new(Connection); diff --git a/net/colo.h b/net/colo.h index 9a7d5e0..6720a3a 100644 --- a/net/colo.h +++ b/net/colo.h @@ -68,6 +68,7 @@ uint32_t connection_key_hash(const void *opaque); int connection_key_equal(const void *opaque1, const void *opaque2); int parse_packet_early(Packet *pkt); void fill_connection_key(Packet *pkt, ConnectionKey *key); +void reverse_connection_key(ConnectionKey *key); Connection *connection_new(ConnectionKey *key); void connection_destroy(void *opaque); Connection *connection_get(GHashTable *connection_track_table, diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c index de29f07..1d49d04 100644 --- a/net/filter-rewriter.c +++ b/net/filter-rewriter.c @@ -44,6 +44,20 @@ static void filter_rewriter_flush(NetFilterState *nf) } } +/* + * Return 1 on success, if return 0 means the pkt + * is not TCP packet + */ +static int is_tcp_packet(Packet *pkt) +{ + if (!parse_packet_early(pkt) && + pkt->ip->ip_p == IPPROTO_TCP) { + return 1; + } else { + return 0; + } +} + static ssize_t colo_rewriter_receive_iov(NetFilterState *nf, NetClientState *sender, unsigned flags, @@ -51,11 +65,47 @@ static ssize_t colo_rewriter_receive_iov(NetFilterState *nf, int iovcnt, NetPacketSent *sent_cb) { + RewriterState *s = FILTER_COLO_REWRITER(nf); + Connection *conn; + ConnectionKey key = { 0 }; + Packet *pkt; + ssize_t size = iov_size(iov, iovcnt); + char *buf = g_malloc0(size); + + iov_to_buf(iov, iovcnt, 0, buf, size); + pkt = packet_new(buf, size); + /* * if we get tcp packet * we will rewrite it to make secondary guest's * connection established successfully */ + if (pkt && is_tcp_packet(pkt)) { + + fill_connection_key(pkt, &key); + + if (sender == nf->netdev) { + /* + * We need make tcp TX and RX packet + * into one connection. + */ + reverse_connection_key(&key); + } + conn = connection_get(s->connection_track_table, + &key, + NULL); + + if (sender == nf->netdev) { + /* NET_FILTER_DIRECTION_TX */ + /* handle_primary_tcp_pkt */ + } else { + /* NET_FILTER_DIRECTION_RX */ + /* handle_secondary_tcp_pkt */ + } + } + + packet_destroy(pkt, NULL); + pkt = NULL; return 0; }