{"id":2220685,"url":"http://patchwork.ozlabs.org/api/1.1/covers/2220685/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/cover/20260407050818.2249570-1-lulu@redhat.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260407050818.2249570-1-lulu@redhat.com>","date":"2026-04-07T05:05:47","name":"[RFC,v4,0/5] net/filter: Add AF_PACKET support for vhost-net","submitter":{"id":78960,"url":"http://patchwork.ozlabs.org/api/1.1/people/78960/?format=json","name":"Cindy Lu","email":"lulu@redhat.com"},"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/cover/20260407050818.2249570-1-lulu@redhat.com/mbox/","series":[{"id":499026,"url":"http://patchwork.ozlabs.org/api/1.1/series/499026/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499026","date":"2026-04-07T05:05:51","name":"net/filter: Add AF_PACKET support for vhost-net","version":4,"mbox":"http://patchwork.ozlabs.org/series/499026/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2220685/comments/","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=Ajz7vD+h;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1775538510;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n bh=r7MgCxBodV/6hEOvHxo+i0I4wG7WCx8i1dakiz9yVNw=;\n b=Ajz7vD+hoL33pf/whrxVOT50aVAVTFck3X4UvonQjfw5UADLa6CgxqoP9tgSmpqbGQG4Pb\n 47JcFRoiTQXoXUPbkVk4DtKL3ZEfES3dVRcP/u8TMewavTdYLdBvOByyqWKxo3Exo3eZ54\n n51a8fZaMOGhk7NynoJY3+kOaY7I0YE=","X-MC-Unique":"fhvUPWEfNa-74KkjgOTvCA-1","X-Mimecast-MFC-AGG-ID":"fhvUPWEfNa-74KkjgOTvCA_1775538506","From":"Cindy Lu ","To":"lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, zhangckid@gmail.com,\n lizhijian@fujitsu.com, jmarcin@redhat.com, qemu-devel@nongnu.org","Subject":"[RFC v4 0/5] net/filter: Add AF_PACKET support for vhost-net","Date":"Tue, 7 Apr 2026 13:05:47 +0800","Message-ID":"<20260407050818.2249570-1-lulu@redhat.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.111","Received-SPF":"pass client-ip=170.10.133.124; envelope-from=lulu@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com","X-Spam_score_int":"-25","X-Spam_score":"-2.6","X-Spam_bar":"--","X-Spam_report":"(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Hi, All\n\nThis series wires AF_PACKET-backed packet capture and inject support into\nthe existing socket chardev backend so filter-redirector can keep using exist\nprocess\n\nExample Usage\n=============\n Users are expected to create the AF_PACKET socket in userspace, bind it\n to the target tap device, and then pass the resulting fd to QEMU via\n the existing FD_PLACEHOLDER mechanism.\n\n Creating such a socket requires CAP_NET_RAW (or running as root). A\n typical setup looks like:\n\n sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW,\n socket.htons(ETH_P_ALL))\n sock.bind((ifname, ETH_P_ALL))\n\n The bound fd can then be passed to QEMU with:\n\n -chardev socket,...,fd=${FD_PLACEHOLDER},...\n\nPrimary VM (mirror incoming packets to secondary via chardev socket):\n\n -netdev \"tap,id=net0,ifname=${TAP}...vhost=on\"\n -device \"${VIRTIO_NET_DEVICE}\"\n -chardev \"socket,id=chain_out,fd=${FD_PLACEHOLDER},af-packet-mode=capture\"\n -chardev \"socket,id=mirror0,host=${MIRROR_HOST},port=${MIRROR_PORT},reconnect-ms=${MIRROR_RECONNECT_MS}\"\n -object \"filter-redirector,id=r1,netdev=net0,queue=tx,indev=chain_out,status=on,vnet_hdr_support=off,position=head\"\n -object \"filter-redirector,id=r1_mirror,netdev=net0,queue=tx,outdev=mirror0,status=on,vnet_hdr_support=off,insert=behind\"\n\nSecondary VM (receive mirrored packets):\n\n -netdev \"tap,id=net0,ifname=${TAP}...vhost=on\"\n -device \"${VIRTIO_NET_DEVICE}\"\n -chardev \"socket,id=red0,host=${MIRROR_BIND_HOST},port=${MIRROR_PORT},server=on,wait=off\"\n -chardev \"socket,id=chain_in,fd=${FD_PLACEHOLDER},af-packet-mode=inject\"\n -object \"filter-redirector,id=r1,netdev=net0,queue=tx,indev=red0,status=off,vnet_hdr_support=off,position=head\"\n -object \"filter-redirector,id=r1_inject,netdev=net0,queue=tx,outdev=chain_in,status=off,vnet_hdr_support=off,position=id=r1,insert=behind\"\n\n\nchangset\n===========\nchange in v2: \n1. add support for filter-buffer \n2. remove the in_netdev and out_netdev for AF_PACKET bind port, now only use netdev \nwhen the vhost=on start use AF_PACKET to capture and inject, when use vhost=off will use\nthe existing code\n3. add CAP_NET_RAW check\n4. address the comment \n\nchange in v3: \n1. reuse the exist Capture/inject process \n\nchange in v4: \n1.move the capture/inject to chardev \n2.move the create/bind socket to user script\n\nTesting\n=======\n- Tested with vhost=on/off TAP device on x86_64\n\n\n\nCindy Lu (5):\n net/filter: allow filters on vhost netdevs\n chardev/socket: add AF_PACKET initialization\n io/channel-socket: tolerate AF_PACKET getpeername\n chardev/socket: add AF_PACKET inject path\n chardev/socket: add AF_PACKET capture path\n\n chardev/char-socket.c | 385 +++++++++++++++++++++++++++++++++-\n chardev/char.c | 3 +\n include/chardev/char-socket.h | 13 ++\n io/channel-socket.c | 6 +-\n net/filter.c | 6 -\n qapi/char.json | 23 +-\n qemu-options.hx | 5 +-\n 7 files changed, 429 insertions(+), 12 deletions(-)"}