From patchwork Tue Feb 11 10:25:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Garzarella X-Patchwork-Id: 1236233 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=O3q3uOKg; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48GzSQ3k5pz9s3x for ; Tue, 11 Feb 2020 21:25:42 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728388AbgBKKZk (ORCPT ); Tue, 11 Feb 2020 05:25:40 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:57654 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728284AbgBKKZk (ORCPT ); Tue, 11 Feb 2020 05:25:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581416738; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=MaKO/4RzA2khe3y4lY7ppPIXFRN7e9gTeNdzJG/BwUs=; b=O3q3uOKgqAmBcms7jJItIXuXikdp4QKfHH/X8FCqfaSlOdF0grwoYJ202CpDY2A58ZxTrD 0f9P0TXkaWPeU/ojiyTljCzpJGoIRj+NUwpBret3adn1QfwAGFqhN/0cICWRwZ/HbOZCNk LA1bdYfRg3SffMMouAg60ENXTX9bDes= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-383-fmH5fYGAMiml45Chl9Rm8g-1; Tue, 11 Feb 2020 05:25:35 -0500 X-MC-Unique: fmH5fYGAMiml45Chl9Rm8g-1 Received: by mail-wr1-f72.google.com with SMTP id j4so6622684wrs.13 for ; Tue, 11 Feb 2020 02:25:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=MaKO/4RzA2khe3y4lY7ppPIXFRN7e9gTeNdzJG/BwUs=; b=o+XvClqI4u9kTCi8t52QW2ukM7yPYmwJhu5bGMtN28nC5oLVCg22lRI8KmeI/XSevY f1dK1+XvmLoqFhxGcUSyfD/S4UQogz3qcCP+nYjUPe42WSrtCXTGvVNJwMmpF5pdwXwY N4dsWZskgrtnAkeCzKUjtb2DxwMUUsFNkcLeT4OPq1tFYMk4L8FhNto+3kStMPEMzUqk OYUwpSgWT4V+L96pgvrug/pvbTUwjnR2n7JlMBOP3fEeL6sO4ZAXY9YiK6O6dMAFSyZV B06n1kr8jOni7dJs6HSVFMpcjuN3Jxfk5lRilxTB7nrKuWK5qlt/9BME1VISsTogKCl/ CObw== X-Gm-Message-State: APjAAAV0AYn6gvU1Svn4eVR0E8XXWotVnnLvuGdMd5i/3jMu7wjgsK+8 XNkbVI5ylS6Dfep7YqV6QzVLaSwBPCvgbEfiVz6V2AJy07gIPS+Jt11rbVaNgpX0ghC/GVP9iH2 EdLnhtZNN7qGEy2Go X-Received: by 2002:a1c:41c4:: with SMTP id o187mr4787126wma.24.1581416734369; Tue, 11 Feb 2020 02:25:34 -0800 (PST) X-Google-Smtp-Source: APXvYqwz0zddOWlFD9KufcFvIJHpG41yJOjdgVve70lwTZtnuC30FkQUxWHW8bBIOybJAmc0mxf4Zg== X-Received: by 2002:a1c:41c4:: with SMTP id o187mr4787101wma.24.1581416734107; Tue, 11 Feb 2020 02:25:34 -0800 (PST) Received: from steredhat.redhat.com (host209-4-dynamic.27-79-r.retail.telecomitalia.it. [79.27.4.209]) by smtp.gmail.com with ESMTPSA id c4sm3076513wml.7.2020.02.11.02.25.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Feb 2020 02:25:33 -0800 (PST) From: Stefano Garzarella To: mtk.manpages@gmail.com Cc: Stefan Hajnoczi , netdev@vger.kernel.org, linux-man@vger.kernel.org, Dexuan Cui , Jorgen Hansen Subject: [PATCH] vsock.7: add VMADDR_CID_LOCAL description Date: Tue, 11 Feb 2020 11:25:32 +0100 Message-Id: <20200211102532.56795-1-sgarzare@redhat.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Linux 5.6 added the new well-known VMADDR_CID_LOCAL for local communication. This patch explains how to use it and remove the legacy VMADDR_CID_RESERVED no longer available. Signed-off-by: Stefano Garzarella --- man7/vsock.7 | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/man7/vsock.7 b/man7/vsock.7 index c5ffcf07d..d7dc37dcc 100644 --- a/man7/vsock.7 +++ b/man7/vsock.7 @@ -127,8 +127,8 @@ There are several special addresses: means any address for binding; .B VMADDR_CID_HYPERVISOR (0) is reserved for services built into the hypervisor; -.B VMADDR_CID_RESERVED -(1) must not be used; +.B VMADDR_CID_LOCAL +(1) is the well-known address for local communication (loopback); .B VMADDR_CID_HOST (2) is the well-known address of the host. @@ -164,6 +164,16 @@ Consider using .B VMADDR_CID_ANY when binding instead of getting the local CID with .BR IOCTL_VM_SOCKETS_GET_LOCAL_CID . +.SS Local communication +The +.B VMADDR_CID_LOCAL +(1) can be used to address itself. In this case all packets are redirected +to the same host that generated them. Useful for testing and debugging. +.PP +The local CID obtained with +.BR IOCTL_VM_SOCKETS_GET_LOCAL_CID +can be used for the same purpose, but it is preferable to use +.B VMADDR_CID_LOCAL . .SH ERRORS .TP .B EACCES @@ -222,6 +232,8 @@ are valid. Support for VMware (VMCI) has been available since Linux 3.9. KVM (virtio) is supported since Linux 4.8. Hyper-V is supported since Linux 4.14. +.PP +VMADDR_CID_LOCAL is supported since Linux 5.6. .SH SEE ALSO .BR bind (2), .BR connect (2),