From patchwork Sat Jul 2 06:22:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Chen X-Patchwork-Id: 9210715 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3056E60752 for ; Sat, 2 Jul 2016 06:26:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1C6CF28507 for ; Sat, 2 Jul 2016 06:26:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0F16728574; Sat, 2 Jul 2016 06:26:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4399828507 for ; Sat, 2 Jul 2016 06:26:21 +0000 (UTC) Received: from localhost ([::1]:37104 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bJENg-0000Xg-5J for patchwork-qemu-devel@patchwork.kernel.org; Sat, 02 Jul 2016 02:26:20 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39806) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bJEKV-0006Hu-BM for qemu-devel@nongnu.org; Sat, 02 Jul 2016 02:23:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bJEKS-0006Sy-31 for qemu-devel@nongnu.org; Sat, 02 Jul 2016 02:23:03 -0400 Received: from [59.151.112.132] (port=44807 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bJEKO-0006Q4-Pc for qemu-devel@nongnu.org; Sat, 02 Jul 2016 02:23:00 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="8287185" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 02 Jul 2016 14:21:55 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id DE73641C0BBF; Sat, 2 Jul 2016 14:21:54 +0800 (CST) Received: from G08FNSTD140215.g08.fujitsu.local (10.167.226.56) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.279.2; Sat, 2 Jul 2016 14:21:54 +0800 From: Zhang Chen To: qemu devel , Jason Wang Date: Sat, 2 Jul 2016 14:22:20 +0800 Message-ID: <1467440540-6630-4-git-send-email-zhangchen.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1467440540-6630-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> References: <1467440540-6630-1-git-send-email-zhangchen.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.56] X-yoursite-MailScanner-ID: DE73641C0BBF.AEABA 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] [RFC PATCH V2 3/3] filter-rewriter: rewrite tcp packet to keep secondary connection 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP We will rewrite tcp packet secondary received and sent. When colo guest is a tcp server. Firstly, client start a tcp handshake. the packet's seq=client_seq, ack=0,flag=SYN. COLO primary guest get this pkt and mirror(filter-mirror) to secondary guest, secondary get it use filter-redirector. Then,primary guest response pkt (seq=primary_seq,ack=client_seq+1,flag=ACK|SYN). secondary guest response pkt (seq=secondary_seq,ack=client_seq+1,flag=ACK|SYN). In here,we use filter-rewriter save the secondary_seq to it's tcp connection. Finally handshake,client send pkt (seq=client_seq+1,ack=primary_seq+1,flag=ACK). Here,filter-rewriter can get primary_seq, and rewrite ack from primary_seq+1 to secondary_seq+1, recalculate checksum. So the secondary tcp connection kept good. When we send/recv packet. client send pkt(seq=client_seq+1+data_len,ack=primary_seq+1,flag=ACK|PSH). filter-rewriter rewrite ack and send to secondary guest. primary guest response pkt (seq=primary_seq+1,ack=client_seq+1+data_len,flag=ACK) secondary guest response pkt (seq=secondary_seq+1,ack=client_seq+1+data_len,flag=ACK) we rewrite secondary guest seq from secondary_seq+1 to primary_seq+1. So tcp connection kept good. In code We use offset( = secondary_seq - primary_seq ) to rewrite seq or ack. handle_primary_tcp_pkt: tcp_pkt->th_ack += offset; handle_secondary_tcp_pkt: tcp_pkt->th_seq -= offset; Signed-off-by: Zhang Chen Signed-off-by: Li Zhijian Signed-off-by: Wen Congyang --- net/colo-base.h | 2 + net/filter-rewriter.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++- trace-events | 5 +++ 3 files changed, 115 insertions(+), 2 deletions(-) diff --git a/net/colo-base.h b/net/colo-base.h index 62460c5..7b32648 100644 --- a/net/colo-base.h +++ b/net/colo-base.h @@ -71,6 +71,8 @@ typedef struct Connection { uint8_t ip_proto; /* be used by filter-rewriter */ colo_conn_state state; + /* offset = secondary_seq - primary_seq */ + tcp_seq offset; } Connection; uint32_t connection_key_hash(const void *opaque); diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c index c38ab24..9f63c75 100644 --- a/net/filter-rewriter.c +++ b/net/filter-rewriter.c @@ -21,6 +21,7 @@ #include "qemu/main-loop.h" #include "qemu/iov.h" #include "net/checksum.h" +#include "trace.h" #define FILTER_COLO_REWRITER(obj) \ OBJECT_CHECK(RewriterState, (obj), TYPE_FILTER_REWRITER) @@ -64,6 +65,91 @@ static int is_tcp_packet(Packet *pkt) } } +/* handle tcp packet from primary guest */ +static int handle_primary_tcp_pkt(NetFilterState *nf, + Connection *conn, + Packet *pkt) +{ + struct tcphdr *tcp_pkt; + static int syn_flag; + + tcp_pkt = (struct tcphdr *)pkt->transport_layer; + if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) { + char *sdebug, *ddebug; + sdebug = strdup(inet_ntoa(pkt->ip->ip_src)); + ddebug = strdup(inet_ntoa(pkt->ip->ip_dst)); + trace_colo_filter_rewriter_pkt_info(__func__, sdebug, ddebug, + ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack), + tcp_pkt->th_flags); + trace_colo_filter_rewriter_conn_offset(conn->offset); + g_free(sdebug); + g_free(ddebug); + } + + if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == TH_SYN)) { + /* + * this flag update offset func run oncs + * in independent tcp connection + */ + syn_flag = 1; + } + + if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == TH_ACK)) { + if (syn_flag) { + /* offset = secondary_seq - primary seq */ + conn->offset -= (ntohl(tcp_pkt->th_ack)); + syn_flag = 0; + + } + /* handle packets to the secondary from the primary */ + tcp_pkt->th_ack = htonl(ntohl(tcp_pkt->th_ack) + conn->offset + 1); + + net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + } + + return 0; +} + +/* handle tcp packet from secondary guest */ +static int handle_secondary_tcp_pkt(NetFilterState *nf, + Connection *conn, + Packet *pkt) +{ + struct tcphdr *tcp_pkt; + + tcp_pkt = (struct tcphdr *)pkt->transport_layer; + + if (trace_event_get_state(TRACE_COLO_FILTER_REWRITER_DEBUG)) { + char *sdebug, *ddebug; + sdebug = strdup(inet_ntoa(pkt->ip->ip_src)); + ddebug = strdup(inet_ntoa(pkt->ip->ip_dst)); + trace_colo_filter_rewriter_pkt_info(__func__, sdebug, ddebug, + ntohl(tcp_pkt->th_seq), ntohl(tcp_pkt->th_ack), + tcp_pkt->th_flags); + trace_colo_filter_rewriter_conn_offset(conn->offset); + g_free(sdebug); + g_free(ddebug); + } + + if (((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) == (TH_ACK | TH_SYN))) { + /* + * save offset = secondary_seq and then + * in handle_primary_tcp_pkt make offset + * = secondary_seq - primary_seq + */ + conn->offset = ntohl(tcp_pkt->th_seq); + } + + 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 - 1); + + net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + } + + return 0; +} + static ssize_t colo_rewriter_receive_iov(NetFilterState *nf, NetClientState *sender, unsigned flags, @@ -105,10 +191,30 @@ static ssize_t colo_rewriter_receive_iov(NetFilterState *nf, if (sender == nf->netdev) { /* NET_FILTER_DIRECTION_TX */ - /* handle_primary_tcp_pkt */ + if (!handle_primary_tcp_pkt(nf, conn, pkt)) { + qemu_net_queue_send(s->incoming_queue, sender, 0, + (const uint8_t *)pkt->data, pkt->size, NULL); + packet_destroy(pkt, NULL); + pkt = NULL; + /* + * We block the packet here,after rewrite pkt + * and will send it + */ + return 1; + } } else { /* NET_FILTER_DIRECTION_RX */ - /* handle_secondary_tcp_pkt */ + if (!handle_secondary_tcp_pkt(nf, conn, pkt)) { + qemu_net_queue_send(s->incoming_queue, sender, 0, + (const uint8_t *)pkt->data, pkt->size, NULL); + packet_destroy(pkt, NULL); + pkt = NULL; + /* + * We block the packet here,after rewrite pkt + * and will send it + */ + return 1; + } } } diff --git a/trace-events b/trace-events index 6686cdf..5ac56f6 100644 --- a/trace-events +++ b/trace-events @@ -1927,3 +1927,8 @@ colo_compare_icmp_miscompare_mtu(const char *sta, int size) ": %s %d" colo_compare_ip_info(int psize, const char *sta, const char *stb, int ssize, const char *stc, const char *std) "ppkt size = %d, ip_src = %s, ip_dst = %s, spkt size = %d, ip_src = %s, ip_dst = %s" colo_old_packet_check_found(int64_t old_time) "%" PRId64 colo_compare_miscompare(void) "" + +# net/filter-rewriter.c +colo_filter_rewriter_debug(void) "" +colo_filter_rewriter_pkt_info(const char *func, const char *src, const char *dst, uint32_t seq, uint32_t ack, uint32_t flag) "%s: src/dst: %s/%s p: seq/ack=%u/%u flags=%x\n" +colo_filter_rewriter_conn_offset(uint32_t offset) ": offset=%u\n"