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Miller" , Jakub Kicinski , Eric Dumazet , Hideaki YOSHIFUJI , "David Ahern" , Shuah Khan , "Jesper Dangaard Brouer" , Nathan Chancellor , "Nick Desaulniers" , Joe Stringer , "Florent Revest" , , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , "Kumar Kartikeya Dwivedi" , Florian Westphal , , Maxim Mikityanskiy Subject: [PATCH bpf-next v8 1/5] bpf: Fix documentation of th_len in bpf_tcp_{gen,check}_syncookie Date: Fri, 29 Apr 2022 14:15:37 +0300 Message-ID: <20220429111541.339853-2-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220429111541.339853-1-maximmi@nvidia.com> References: <20220429111541.339853-1-maximmi@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cea6704f-72bd-423b-b2f4-08da29d1a7d9 X-MS-TrafficTypeDiagnostic: BN6PR1201MB0100:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230001)(4636009)(36840700001)(40470700004)(46966006)(508600001)(6666004)(7696005)(8936002)(5660300002)(7416002)(26005)(81166007)(107886003)(356005)(2616005)(47076005)(426003)(1076003)(186003)(336012)(36756003)(110136005)(316002)(54906003)(82310400005)(83380400001)(4326008)(2906002)(70586007)(70206006)(36860700001)(8676002)(40460700003)(86362001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Apr 2022 11:16:06.5437 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cea6704f-72bd-423b-b2f4-08da29d1a7d9 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.234];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT009.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR1201MB0100 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org bpf_tcp_gen_syncookie expects the full length of the TCP header (with all options), and bpf_tcp_check_syncookie accepts lengths bigger than sizeof(struct tcphdr). Fix the documentation that says these lengths should be exactly sizeof(struct tcphdr). While at it, fix a typo in the name of struct ipv6hdr. Signed-off-by: Maxim Mikityanskiy Reviewed-by: Tariq Toukan --- include/uapi/linux/bpf.h | 10 ++++++---- tools/include/uapi/linux/bpf.h | 10 ++++++---- 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 444fe6f1cf35..4dd9e34f2a60 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -3587,10 +3587,11 @@ union bpf_attr { * * *iph* points to the start of the IPv4 or IPv6 header, while * *iph_len* contains **sizeof**\ (**struct iphdr**) or - * **sizeof**\ (**struct ip6hdr**). + * **sizeof**\ (**struct ipv6hdr**). * * *th* points to the start of the TCP header, while *th_len* - * contains **sizeof**\ (**struct tcphdr**). + * contains the length of the TCP header (at least + * **sizeof**\ (**struct tcphdr**)). * Return * 0 if *iph* and *th* are a valid SYN cookie ACK, or a negative * error otherwise. @@ -3773,10 +3774,11 @@ union bpf_attr { * * *iph* points to the start of the IPv4 or IPv6 header, while * *iph_len* contains **sizeof**\ (**struct iphdr**) or - * **sizeof**\ (**struct ip6hdr**). + * **sizeof**\ (**struct ipv6hdr**). * * *th* points to the start of the TCP header, while *th_len* - * contains the length of the TCP header. + * contains the length of the TCP header with options (at least + * **sizeof**\ (**struct tcphdr**)). * Return * On success, lower 32 bits hold the generated SYN cookie in * followed by 16 bits which hold the MSS value for that cookie, diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 444fe6f1cf35..4dd9e34f2a60 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3587,10 +3587,11 @@ union bpf_attr { * * *iph* points to the start of the IPv4 or IPv6 header, while * *iph_len* contains **sizeof**\ (**struct iphdr**) or - * **sizeof**\ (**struct ip6hdr**). + * **sizeof**\ (**struct ipv6hdr**). * * *th* points to the start of the TCP header, while *th_len* - * contains **sizeof**\ (**struct tcphdr**). + * contains the length of the TCP header (at least + * **sizeof**\ (**struct tcphdr**)). * Return * 0 if *iph* and *th* are a valid SYN cookie ACK, or a negative * error otherwise. @@ -3773,10 +3774,11 @@ union bpf_attr { * * *iph* points to the start of the IPv4 or IPv6 header, while * *iph_len* contains **sizeof**\ (**struct iphdr**) or - * **sizeof**\ (**struct ip6hdr**). + * **sizeof**\ (**struct ipv6hdr**). * * *th* points to the start of the TCP header, while *th_len* - * contains the length of the TCP header. + * contains the length of the TCP header with options (at least + * **sizeof**\ (**struct tcphdr**)). * Return * On success, lower 32 bits hold the generated SYN cookie in * followed by 16 bits which hold the MSS value for that cookie, -- 2.30.2