From patchwork Wed Jul 27 18:54:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrea Mayer X-Patchwork-Id: 594200 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61718C19F21 for ; Wed, 27 Jul 2022 19:12:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236535AbiG0TMJ (ORCPT ); Wed, 27 Jul 2022 15:12:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234671AbiG0TLz (ORCPT ); Wed, 27 Jul 2022 15:11:55 -0400 Received: from smtp.uniroma2.it (smtp.uniroma2.it [160.80.6.16]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E5F765D5D; Wed, 27 Jul 2022 11:55:23 -0700 (PDT) Received: from localhost.localdomain ([160.80.103.126]) by smtp-2015.uniroma2.it (8.14.4/8.14.4/Debian-8) with ESMTP id 26RIsnCF027831 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Wed, 27 Jul 2022 20:54:51 +0200 From: Andrea Mayer To: "David S. Miller" , Hideaki YOSHIFUJI , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Anton Makarov , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Stefano Salsano , Paolo Lungaroni , Ahmed Abdelsalam , Andrea Mayer Subject: [net-next v5 2/4] seg6: add support for SRv6 H.L2Encaps.Red behavior Date: Wed, 27 Jul 2022 20:54:06 +0200 Message-Id: <20220727185408.7077-3-andrea.mayer@uniroma2.it> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220727185408.7077-1-andrea.mayer@uniroma2.it> References: <20220727185408.7077-1-andrea.mayer@uniroma2.it> MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.100.0 at smtp-2015 X-Virus-Status: Clean Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The SRv6 H.L2Encaps.Red behavior described in [1] is an optimization of the SRv6 H.L2Encaps behavior [2]. H.L2Encaps.Red reduces the length of the SRH by excluding the first segment (SID) in the SRH of the pushed IPv6 header. The first SID is only placed in the IPv6 Destination Address field of the pushed IPv6 header. When the SRv6 Policy only contains one SID the SRH is omitted, unless there is an HMAC TLV to be carried. [1] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.4 [2] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.3 Signed-off-by: Andrea Mayer Signed-off-by: Anton Makarov --- include/uapi/linux/seg6_iptunnel.h | 1 + net/ipv6/seg6_iptunnel.c | 12 +++++++++++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/seg6_iptunnel.h b/include/uapi/linux/seg6_iptunnel.h index 538152a7b2c3..a9fa777f16de 100644 --- a/include/uapi/linux/seg6_iptunnel.h +++ b/include/uapi/linux/seg6_iptunnel.h @@ -36,6 +36,7 @@ enum { SEG6_IPTUN_MODE_ENCAP, SEG6_IPTUN_MODE_L2ENCAP, SEG6_IPTUN_MODE_ENCAP_RED, + SEG6_IPTUN_MODE_L2ENCAP_RED, }; #endif diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c index 454bd8a838e6..34db881204d2 100644 --- a/net/ipv6/seg6_iptunnel.c +++ b/net/ipv6/seg6_iptunnel.c @@ -40,6 +40,7 @@ static size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo) head = sizeof(struct ipv6hdr); break; case SEG6_IPTUN_MODE_L2ENCAP: + case SEG6_IPTUN_MODE_L2ENCAP_RED: return 0; } @@ -413,6 +414,7 @@ static int seg6_do_srh(struct sk_buff *skb) skb->protocol = htons(ETH_P_IPV6); break; case SEG6_IPTUN_MODE_L2ENCAP: + case SEG6_IPTUN_MODE_L2ENCAP_RED: if (!skb_mac_header_was_set(skb)) return -EINVAL; @@ -422,7 +424,13 @@ static int seg6_do_srh(struct sk_buff *skb) skb_mac_header_rebuild(skb); skb_push(skb, skb->mac_len); - err = seg6_do_srh_encap(skb, tinfo->srh, IPPROTO_ETHERNET); + if (tinfo->mode == SEG6_IPTUN_MODE_L2ENCAP) + err = seg6_do_srh_encap(skb, tinfo->srh, + IPPROTO_ETHERNET); + else + err = seg6_do_srh_encap_red(skb, tinfo->srh, + IPPROTO_ETHERNET); + if (err) return err; @@ -643,6 +651,8 @@ static int seg6_build_state(struct net *net, struct nlattr *nla, break; case SEG6_IPTUN_MODE_ENCAP_RED: break; + case SEG6_IPTUN_MODE_L2ENCAP_RED: + break; default: return -EINVAL; }