From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="OCYx2jKd" Received: from smtp-fw-52003.amazon.com (smtp-fw-52003.amazon.com [52.119.213.152]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00388D9; Sun, 10 Dec 2023 23:37:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1702280258; x=1733816258; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7wmKmdaMBtvgkg9INuHzDnHxJd3l7VIHvc9Dvx5C90A=; b=OCYx2jKdEPcg81IdnZ05Wf+nC/l/vU3g5oqiUFpWF9SiWnpFd/nnMcHv X1T5eaTO7swdVv/mxX0aOd/0WC9AEDba0SHLyuBdKUXYi/JQlSslbd3Js N1iSvfGMW1HSso0jLPlJACWWPBbk/G+lEdhX21J83oVZQt40b4FSES+a/ s=; X-IronPort-AV: E=Sophos;i="6.04,267,1695686400"; d="scan'208";a="624433964" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-iad-1e-m6i4x-0aba4706.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-52003.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2023 07:37:36 +0000 Received: from smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev (iad7-ws-svc-p70-lb3-vlan2.iad.amazon.com [10.32.235.34]) by email-inbound-relay-iad-1e-m6i4x-0aba4706.us-east-1.amazon.com (Postfix) with ESMTPS id E574BA2CEC; Mon, 11 Dec 2023 07:37:34 +0000 (UTC) Received: from EX19MTAUWC002.ant.amazon.com [10.0.38.20:41278] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.14.170:2525] with esmtp (Farcaster) id 90d80a42-5501-4afc-beee-d902aecd623f; Mon, 11 Dec 2023 07:37:33 +0000 (UTC) X-Farcaster-Flow-ID: 90d80a42-5501-4afc-beee-d902aecd623f Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Mon, 11 Dec 2023 07:37:32 +0000 Received: from 88665a182662.ant.amazon.com (10.119.13.105) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Mon, 11 Dec 2023 07:37:29 +0000 From: Kuniyuki Iwashima To: Eric Dumazet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau CC: Kuniyuki Iwashima , Kuniyuki Iwashima , , Subject: [PATCH v5 bpf-next 1/6] tcp: Move tcp_ns_to_ts() to tcp.h Date: Mon, 11 Dec 2023 16:36:45 +0900 Message-ID: <20231211073650.90819-2-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20231211073650.90819-1-kuniyu@amazon.com> References: <20231211073650.90819-1-kuniyu@amazon.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D040UWA002.ant.amazon.com (10.13.139.113) To EX19D004ANA001.ant.amazon.com (10.37.240.138) Precedence: Bulk We will support arbitrary SYN Cookie with BPF. When BPF prog validates ACK and kfunc allocates a reqsk, we need to call tcp_ns_to_ts() to calculate an offset of TSval for later use: time t0 : Send SYN+ACK -> tsval = Initial TSval (Random Number) t1 : Recv ACK of 3WHS -> tsoff = TSecr - tcp_ns_to_ts(usec_ts_ok, tcp_clock_ns()) = Initial TSval - t1 t2 : Send ACK -> tsval = t2 + tsoff = Initial TSval + (t2 - t1) = Initial TSval + Time Delta (x) (x) Note that the time delta does not include the initial RTT from t0 to t1. Let's move tcp_ns_to_ts() to tcp.h. Signed-off-by: Kuniyuki Iwashima --- include/net/tcp.h | 9 +++++++++ net/ipv4/syncookies.c | 9 --------- 2 files changed, 9 insertions(+), 9 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 973555cb1d3f..c77354d1b86d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -577,6 +577,15 @@ static inline u32 tcp_cookie_time(void) return val; } +/* Convert one nsec 64bit timestamp to ts (ms or usec resolution) */ +static inline u64 tcp_ns_to_ts(bool usec_ts, u64 val) +{ + if (usec_ts) + return div_u64(val, NSEC_PER_USEC); + + return div_u64(val, NSEC_PER_MSEC); +} + u32 __cookie_v4_init_sequence(const struct iphdr *iph, const struct tcphdr *th, u16 *mssp); __u32 cookie_v4_init_sequence(const struct sk_buff *skb, __u16 *mss); diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 61f1c96cfe63..981944c22820 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -51,15 +51,6 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport, count, &syncookie_secret[c]); } -/* Convert one nsec 64bit timestamp to ts (ms or usec resolution) */ -static u64 tcp_ns_to_ts(bool usec_ts, u64 val) -{ - if (usec_ts) - return div_u64(val, NSEC_PER_USEC); - - return div_u64(val, NSEC_PER_MSEC); -} - /* * when syncookies are in effect and tcp timestamps are enabled we encode * tcp options in the lower bits of the timestamp value that will be -- 2.30.2