From nobody Tue Feb 10 14:49:33 2026 Received: from sender11-of-o51.zoho.eu (sender11-of-o51.zoho.eu [31.186.226.237]) (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 BD8A25CB0 for ; Mon, 10 Oct 2022 22:18:36 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; t=1665440308; cv=none; d=zohomail.eu; s=zohoarc; b=kn0f4d8etNJDGbFQ464clUsqmCTnlKm/R1PKQUSvs2HezwrXswbrS8rYVwksk+JLnZbs6Pu+Jdf2sqxFQ4oks5gOpI52cjfrGiJrjrXEpYVPgcSiFtTeyt0FoiYhgCDdK5BD0pFf1bARo+UGooNIV3X3JDW0cyz/xowoTbVkvxk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.eu; s=zohoarc; t=1665440308; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=Xv76KnkqTZVuO5RScDnsFJ5wzxmYYgBVV1S/QyukRwM=; b=XUKGkKTmEg8NnpAKVGrV59uIRTUAnG/h6xhv/39xiQve+wJpkAHL2ZEjdhk8B+rELxrOT58+CJFovqPJi9D3a6KTullae4mBoYei71KbeMGtTO9ax1n3ogJ1SWy8TmpVtiZnrUxjnG6f/ybp64joKN0L+/tMF3sWvPtFjFtaDLo= ARC-Authentication-Results: i=1; mx.zohomail.eu; dkim=pass header.i=shytyi.net; spf=pass smtp.mailfrom=dmytro@shytyi.net; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1665440308; s=hs; d=shytyi.net; i=dmytro@shytyi.net; h=From:From:To:To:Cc:Cc:Message-ID:Subject:Subject:Date:Date:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type:Message-Id:Reply-To; bh=Xv76KnkqTZVuO5RScDnsFJ5wzxmYYgBVV1S/QyukRwM=; b=DvXfbwSe2BB+v92uG+4QaCMm+6qD2ZGeLmmM5uve1FjUlIpFVfgOwCuzntuvd+FC 6uMX2Amq2+h/fiPpABuH6+QEB0fGjL9iuLC5IpDVIAAsz6slgrALc1+Vp4V/oLvwtx1 ksjzc+pq+qS6Y/wv9rzM+fOTKVFE9uGJkzjv3qT8= Received: from localhost.localdomain (vps-940813d4.vps.ovh.net [198.244.188.50]) by mx.zoho.eu with SMTPS id 1665440306886890.3400640647226; Tue, 11 Oct 2022 00:18:26 +0200 (CEST) From: Dmytro Shytyi To: mptcp@lists.linux.dev Cc: Dmytro Shytyi Message-ID: <20221010221809.1792-3-dmytro@shytyi.net> Subject: [RFC PATCH mptcp-next v14 2/5] mptcp: implement delayed seq generation for passive fastopen Date: Mon, 10 Oct 2022 22:18:06 +0000 X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221010221809.1792-1-dmytro@shytyi.net> References: <20221010221809.1792-1-dmytro@shytyi.net> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External Content-Type: text/plain; charset="utf-8" With fastopen in place the first subflow socket is created before the MPC handshake completes, and we need to properly initialize the sequence numbers at MPC ACK reception. Signed-off-by: Dmytro Shytyi --- net/mptcp/Makefile | 2 +- net/mptcp/fastopen.c | 19 +++++++++++++++++++ net/mptcp/options.c | 5 +++++ net/mptcp/protocol.h | 6 ++++++ 4 files changed, 31 insertions(+), 1 deletion(-) create mode 100644 net/mptcp/fastopen.c diff --git a/net/mptcp/Makefile b/net/mptcp/Makefile index 8a7f68efa35f..c42ad8609876 100644 --- a/net/mptcp/Makefile +++ b/net/mptcp/Makefile @@ -2,7 +2,7 @@ obj-$(CONFIG_MPTCP) +=3D mptcp.o =20 mptcp-y :=3D protocol.o subflow.o options.o token.o crypto.o ctrl.o pm.o d= iag.o \ - mib.o pm_netlink.o sockopt.o pm_userspace.o sched.o + mib.o pm_netlink.o sockopt.o pm_userspace.o sched.o fastopen.o =20 obj-$(CONFIG_SYN_COOKIES) +=3D syncookies.o obj-$(CONFIG_INET_MPTCP_DIAG) +=3D mptcp_diag.o diff --git a/net/mptcp/fastopen.c b/net/mptcp/fastopen.c new file mode 100644 index 000000000000..d6fb45e6be4f --- /dev/null +++ b/net/mptcp/fastopen.c @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 + * MPTCP Fast Open Mechanism. Copyright (c) 2021-2022, Dmytro SHYTYI + */ + +#include "protocol.h" + +void mptcp_gen_msk_ackseq_fastopen(struct mptcp_sock *msk, struct mptcp_su= bflow_context *subflow, + struct mptcp_options_received mp_opt) +{ + u64 ack_seq; + + WRITE_ONCE(msk->can_ack, true); + WRITE_ONCE(msk->remote_key, mp_opt.sndr_key); + mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq); + ack_seq++; + WRITE_ONCE(msk->ack_seq, ack_seq); + pr_debug("ack_seq=3D%llu sndr_key=3D%llu", msk->ack_seq, mp_opt.sndr_key); + atomic64_set(&msk->rcv_wnd_sent, ack_seq); +} diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 30d289044e71..0b6c4535750c 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -1208,6 +1208,11 @@ bool mptcp_incoming_options(struct sock *sk, struct = sk_buff *skb) mpext->dsn64 =3D 1; mpext->mpc_map =3D 1; mpext->data_fin =3D 0; + + if (msk->is_mptfo) { + mptcp_gen_msk_ackseq_fastopen(msk, subflow, mp_opt); + mpext->data_seq =3D READ_ONCE(msk->ack_seq); + } } else { mpext->data_seq =3D mp_opt.data_seq; mpext->subflow_seq =3D mp_opt.subflow_seq; diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 18f866b1afda..41276788626b 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -282,6 +282,7 @@ struct mptcp_sock { bool use_64bit_ack; /* Set when we received a 64-bit DSN */ bool csum_enabled; bool allow_infinite_fallback; + bool is_mptfo; u8 mpc_endpoint_id; u8 recvmsg_inq:1, cork:1, @@ -840,6 +841,11 @@ void mptcp_event_addr_announced(const struct sock *ssk= , const struct mptcp_addr_ void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); =20 +// Fast Open Mechanism functions begin +void mptcp_gen_msk_ackseq_fastopen(struct mptcp_sock *msk, struct mptcp_su= bflow_context *subflow, + struct mptcp_options_received mp_opt); +// Fast Open Mechanism functions end + static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) { return READ_ONCE(msk->pm.addr_signal) & --=20 2.34.1