From owner-freebsd-net@freebsd.org Tue Sep 8 05:52:25 2020 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id DE3093E4682 for ; Tue, 8 Sep 2020 05:52:25 +0000 (UTC) (envelope-from Michael.Tuexen@lurchi.franken.de) Received: from drew.franken.de (mail-n.franken.de [193.175.24.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.franken.de", Issuer "Sectigo RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BlvS84DSYz4Hxc for ; Tue, 8 Sep 2020 05:52:24 +0000 (UTC) (envelope-from Michael.Tuexen@lurchi.franken.de) Received: from [IPv6:2a02:8109:1140:c3d:b8e0:2901:13c2:2133] (unknown [IPv6:2a02:8109:1140:c3d:b8e0:2901:13c2:2133]) (Authenticated sender: lurchi) by mail-n.franken.de (Postfix) with ESMTPSA id 393DF76DF3D51; Tue, 8 Sep 2020 07:52:21 +0200 (CEST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\)) Subject: Re: Address Differences between UDP and SCTP From: Michael Tuexen In-Reply-To: <6DB5BF95-F7D8-4933-8633-644A553E8C75@mail.sermon-archive.info> Date: Tue, 8 Sep 2020 07:52:20 +0200 Cc: freebsd-net@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: <5FDFA318-A3F3-4BAA-9413-33D0FE961717@lurchi.franken.de> References: <6A9D0A4B-F35C-4012-A868-5450D60EC13B@mail.sermon-archive.info> <7CF5C0CF-A173-4253-9F93-70199578A8F7@lurchi.franken.de> <6DB5BF95-F7D8-4933-8633-644A553E8C75@mail.sermon-archive.info> To: Doug Hardie X-Mailer: Apple Mail (2.3608.120.23.2.1) X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=disabled version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail-n.franken.de X-Rspamd-Queue-Id: 4BlvS84DSYz4Hxc X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of Michael.Tuexen@lurchi.franken.de has no SPF policy when checking 193.175.24.27) smtp.mailfrom=Michael.Tuexen@lurchi.franken.de X-Spamd-Result: default: False [-0.80 / 15.00]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; NEURAL_HAM_LONG(-0.98)[-0.980]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[franken.de]; ARC_NA(0.00)[]; AUTH_NA(1.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_SHORT(-0.22)[-0.224]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_MEDIUM(-0.89)[-0.892]; R_SPF_NA(0.00)[no SPF record]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:680, ipnet:193.174.0.0/15, country:DE]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-net]; RCVD_IN_DNSWL_LOW(-0.10)[193.175.24.27:from] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Sep 2020 05:52:25 -0000 > On 8. Sep 2020, at 02:18, Doug Hardie wrote: >=20 >=20 >> On 7 September 2020, at 13:57, Michael Tuexen = wrote: >>=20 >> For UDP and TCP you always get IPv6 addresses on AF_INET6 sockets. If = you are actually using IPv4, IPv4-mapped IPv6 addresses are used. For = SCTP you an choose if you want IPv4-mapped IPv6 addresses or IPv4 = address. It is controlled by >> the socket option specified in = https://tools.ietf.org/html/rfc6458#section-8.1.15 >=20 > I used: >=20 > optval =3D 1; > rc =3D setsockopt (recv_fd, IPPROTO_IPV6, = SCTP_I_WANT_MAPPED_V4_ADDR, > &optval, sizeof(optval)); >=20 > FreeBSD 12.1. Result was "Operation not supported" It is an IPPROTO_SCTP level socket option. So you need to use rc =3D setsockopt (recv_fd, IPPROTO_SCTP, = SCTP_I_WANT_MAPPED_V4_ADDR, &optval, sizeof(optval)); Best regards Michael >=20 > -- Doug >=20