From patchwork Thu Nov 14 21:50:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Patchwork-Id: 13875650 Received: from relay7-d.mail.gandi.net (relay7-d.mail.gandi.net [217.70.183.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C1FA1BD017; Thu, 14 Nov 2024 21:51:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.200 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731621091; cv=none; b=GKOjWJSJWOD2bIqX4j25AveJjplvdmoPYUP/PD+zV6WIxZ6sUNW/l2xN/dmBV4kC539XqmsTYz1TVQcs7np+LMwjXH4EVxW++F49xRhq+0pllCQES+fcDr2a1DRH5SOqSHiS0UCt7RxctLiJFdh6XTowOmnXPU8K2Kqob9k7lw4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731621091; c=relaxed/simple; bh=/TYlIGh43uZ2oGRs63KqJs/W1ncn7lTXX8QwIUC4hn0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WmoHMlN1RXxKonO8Bf+Qayp1BWQEfsCxLkS5USPTTe3HU8F3mOFnZ0wO5y1UM0YyGkYUamzD4DZqAvlePRdqG6pT3gg/THcX3170zZ0m1T/wj7ebDTALQFGWh0kLHvBWpXYnWQuAlTWAcolb4R0GetEBpFeQNuK2mgjEz2mF2Sk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=cavhCok6; arc=none smtp.client-ip=217.70.183.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="cavhCok6" Received: by mail.gandi.net (Postfix) with ESMTPSA id 9443720009; Thu, 14 Nov 2024 21:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1731621086; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YlAnjMfndBsvEIBw3VMVMMIUcV/hdFiV4FRyR/9nVXY=; b=cavhCok6bHGnjACLpehVRFJdXpjD1DVoq1cBrDug915ARYQFIQD89/tJRDatkaO5tG6+OV eEkI5n3gdE3at8HZYNupg00VJxKyvSwwvpILu0O+gH9as7EKye93W22tE6U665zX9dIO8R NDMRo6VGqDptgBkDWTkX1oKWgTIJQlktmBXD2Hz/MKu11+eB4jZU4G4LvYW3K5jRoHktqN epxLqYFxDc0r+7kzr+8tc71WT7zVFr+5PpFllzNEAunp8eqrq9akBVK9kW/KH8knWmVRPu Qh7pOK3eMWVIquAFsg9FETCr3QdFqEwmGiO3PZZiiEWfPEIWR1RgnGXpc0vilg== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Thu, 14 Nov 2024 22:50:42 +0100 Subject: [PATCH bpf-next v2 11/13] selftests/bpf: add network helpers to generate udp checksums Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241114-flow_dissector-v2-11-ee4a3be3de65@bootlin.com> References: <20241114-flow_dissector-v2-0-ee4a3be3de65@bootlin.com> In-Reply-To: <20241114-flow_dissector-v2-0-ee4a3be3de65@bootlin.com> To: Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , Bastien Curutchet , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation?= =?utf-8?q?=29?= X-Mailer: b4 0.14.2 X-GND-Sasl: alexis.lothore@bootlin.com network_helpers.c provides some helpers to generate ip checksums or ip pseudo-header checksums, but not for upper layers (eg: udp checksums) Add helpers for udp checksum to allow manually building udp packets. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- Changes in v2: - new patch --- tools/testing/selftests/bpf/network_helpers.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h index 6d1ae56080c56a65c437899c32566f0e4c496c33..fa82269f7a169a518ba210fa8641eba02f262333 100644 --- a/tools/testing/selftests/bpf/network_helpers.h +++ b/tools/testing/selftests/bpf/network_helpers.h @@ -161,6 +161,33 @@ build_ipv6_pseudo_header_csum(const struct in6_addr *saddr, return csum_fold((__u32)s); } +static inline __sum16 build_udp_v4_csum(const struct iphdr *iph, __u8 l4_proto, + __u16 l4_len, const void *l4_start, + int num_words) +{ + unsigned long pseudo_sum; + int num_u16 = sizeof(iph->saddr); /* halfwords: twice byte len */ + + pseudo_sum = add_csum_hword((void *)&iph->saddr, num_u16); + pseudo_sum += htons(l4_proto); + pseudo_sum += l4_len; + pseudo_sum += add_csum_hword(l4_start, num_words); + return csum_fold(pseudo_sum); +} + +static inline __sum16 build_udp_v6_csum(const struct ipv6hdr *ip6h, + const void *l4_start, int num_words) +{ + unsigned long pseudo_sum; + int num_u16 = sizeof(ip6h->saddr); /* halfwords: twice byte len */ + + pseudo_sum = add_csum_hword((void *)&ip6h->saddr, num_u16); + pseudo_sum += htons(ip6h->nexthdr); + pseudo_sum += ip6h->payload_len; + pseudo_sum += add_csum_hword(l4_start, num_words); + return csum_fold(pseudo_sum); +} + struct tmonitor_ctx; #ifdef TRAFFIC_MONITOR