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Miller" , Jakub Kicinski , Petar Penkov , Lorenz Bauer , Eric Dumazet , Maxim Mikityanskiy Subject: [PATCH bpf v2 4/4] bpf: Fix documentation of th_len in bpf_tcp_{gen,check}_syncookie Date: Mon, 24 Jan 2022 17:11:46 +0200 Message-ID: <20220124151146.376446-5-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220124151146.376446-1-maximmi@nvidia.com> References: <20220124151146.376446-1-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: fc14715b-d894-4b05-b2f9-08d9df4c0a9e X-MS-TrafficTypeDiagnostic: CH2PR12MB3831:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; 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:12.22.5.235;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(4636009)(40470700004)(36840700001)(46966006)(336012)(8676002)(40460700003)(36756003)(2616005)(426003)(36860700001)(1076003)(7416002)(26005)(70586007)(7696005)(508600001)(82310400004)(356005)(186003)(70206006)(8936002)(5660300002)(83380400001)(81166007)(54906003)(4326008)(2906002)(107886003)(110136005)(86362001)(316002)(6666004)(47076005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jan 2022 15:13:13.6598 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fc14715b-d894-4b05-b2f9-08d9df4c0a9e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.235];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT023.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3831 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie expect the full length of the TCP header (with all extensions). Fix the documentation that says it should be sizeof(struct tcphdr). Fixes: 399040847084 ("bpf: add helper to check for a valid SYN cookie") Fixes: 70d66244317e ("bpf: add bpf_tcp_gen_syncookie helper") Signed-off-by: Maxim Mikityanskiy Reviewed-by: Tariq Toukan --- include/uapi/linux/bpf.h | 6 ++++-- tools/include/uapi/linux/bpf.h | 6 ++++-- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index b0383d371b9a..520f1e557dce 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -3553,7 +3553,8 @@ union bpf_attr { * **sizeof**\ (**struct ip6hdr**). * * *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. @@ -3739,7 +3740,8 @@ union bpf_attr { * **sizeof**\ (**struct ip6hdr**). * * *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 (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 b0383d371b9a..520f1e557dce 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -3553,7 +3553,8 @@ union bpf_attr { * **sizeof**\ (**struct ip6hdr**). * * *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. @@ -3739,7 +3740,8 @@ union bpf_attr { * **sizeof**\ (**struct ip6hdr**). * * *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 (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