From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E763C32773 for ; Thu, 18 Aug 2022 17:01:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344630AbiHRRBe (ORCPT ); Thu, 18 Aug 2022 13:01:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345348AbiHRRAc (ORCPT ); Thu, 18 Aug 2022 13:00:32 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2830C00CA for ; Thu, 18 Aug 2022 10:00:23 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id n7so2429978wrv.4 for ; Thu, 18 Aug 2022 10:00:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=TTM1N0pozEi1ZwuAicctDY4Ebesq3/EO1cjWgF0hb64=; b=fOo3VI1g9BmPPgN7rpnPW1lV2d3KC1BwBi5fU8pOlu6RdoUYKuCo0aE+lbpHzCMnSl zuliEMyU7akY6nN8Qbgwu5pYNHu4/S1ka9vxrr866PUnfGe6iRAz//I7V2gi0Jo5q6tA Ewe4e4MQs+3XeGZZjnthnQI8/W3ckjY05miknqoVGod6S50gp2QZnY93XOjmfNRo83UP ueBK3mW0DuB74cU0fhC+9y6scMaVbnEB1W2Z6TFV2QUERh/i36VZkIHH5NKDyjyRgk4n 0zsgbQZOPZ7woDCrclDYj6J2uOk64Nb+zBKx968J3azSNrgEgJyk8zvSGGjXIRF9ZKp8 44ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=TTM1N0pozEi1ZwuAicctDY4Ebesq3/EO1cjWgF0hb64=; b=WIliFUm+A9GbDswR2wdEG/OaVxng9cTHaFT5YW/2Xowv/i0iyXwdKYzdJwY513b1+d JC9apvfjIB3L9MbxOkr/dfedx6pmIoGvLe+ofvWChnCbJQh/ItLmc3ijDy7SJa9MW4H8 2kxM+OpKw9Y7MrYlEToUrffkgwChZrP5Iy0XDpEnczReqA/bqzuDf3P67FUJEBzIgpfk izXNcFJAp3SMV/NJPyP2twst+gXN/muM9PsBSlo+2cA4H6esc4exdItvyMaCfqqj7OK+ Y9zoQzxib8FBHkm1aGSDTerDkd2bQeBAugtl3YjR2rC4r5ozmv//1ZhhICPkAPtah9Sz 7vHQ== X-Gm-Message-State: ACgBeo25OwwhfHZssGB7ceud3wbnhqCtEHTIxo4Nf39HBWas7Ddl4/RN Cj16zXwPSCPupenLrisbaqHouw== X-Google-Smtp-Source: AA6agR4Bi9FWueEdfgfnGm3vffmOECSbA/4skiRs1lc76RzCakmLtMT7McffTq5GWOmP9g5CS6QkFA== X-Received: by 2002:a05:6000:11c8:b0:225:3316:6957 with SMTP id i8-20020a05600011c800b0022533166957mr998191wrx.218.1660842023450; Thu, 18 Aug 2022 10:00:23 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id be13-20020a05600c1e8d00b003a511e92abcsm2662169wmb.34.2022.08.18.10.00.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Aug 2022 10:00:23 -0700 (PDT) From: Dmitry Safonov To: Eric Dumazet , "David S. Miller" , linux-kernel@vger.kernel.org Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , David Ahern , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Jakub Kicinski , Leonard Crestez , Paolo Abeni , Salam Noureddine , Shuah Khan , netdev@vger.kernel.org, linux-crypto@vger.kernel.org Subject: [PATCH 07/31] tcp: Add TCP-AO config and structures Date: Thu, 18 Aug 2022 17:59:41 +0100 Message-Id: <20220818170005.747015-8-dima@arista.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220818170005.747015-1-dima@arista.com> References: <20220818170005.747015-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce new kernel config option and common structures as well as helpers to be used by TCP-AO code. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/linux/tcp.h | 3 ++ include/net/tcp.h | 8 +--- include/net/tcp_ao.h | 90 ++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/tcp.h | 2 + net/ipv4/Kconfig | 13 ++++++ 5 files changed, 110 insertions(+), 6 deletions(-) create mode 100644 include/net/tcp_ao.h diff --git a/include/linux/tcp.h b/include/linux/tcp.h index a9fbe22732c3..c8a8aaaf725b 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -435,6 +435,9 @@ struct tcp_sock { /* TCP MD5 Signature Option information */ struct tcp_md5sig_info __rcu *md5sig_info; #endif +#ifdef CONFIG_TCP_AO + struct tcp_ao_info __rcu *ao_info; +#endif /* TCP fastopen related information */ struct tcp_fastopen_request *fastopen_req; diff --git a/include/net/tcp.h b/include/net/tcp.h index 75bb817928c1..b4b009094bf6 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -1605,12 +1606,7 @@ static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) tp->retransmit_skb_hint = NULL; } -union tcp_md5_addr { - struct in_addr a4; -#if IS_ENABLED(CONFIG_IPV6) - struct in6_addr a6; -#endif -}; +#define tcp_md5_addr tcp_ao_addr /* - key database */ struct tcp_md5sig_key { diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h new file mode 100644 index 000000000000..39b3fc31e5a1 --- /dev/null +++ b/include/net/tcp_ao.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _TCP_AO_H +#define _TCP_AO_H + +#define TCP_AO_MAX_HASH_SIZE 64 +#define TCP_AO_KEY_ALIGN 1 +#define __tcp_ao_key_align __aligned(TCP_AO_KEY_ALIGN) + +union tcp_ao_addr { + struct in_addr a4; +#if IS_ENABLED(CONFIG_IPV6) + struct in6_addr a6; +#endif +}; + +struct tcp_ao_hdr { + u8 kind; + u8 length; + u8 keyid; + u8 rnext_keyid; +}; + +struct tcp_ao_key { + struct hlist_node node; + union tcp_ao_addr addr; + u8 key[TCP_AO_MAXKEYLEN] __tcp_ao_key_align; + unsigned int crypto_pool_id; + u16 port; + u8 prefixlen; + u8 family; + u8 keylen; + u8 keyflags; + u8 sndid; + u8 rcvid; + u8 maclen; + u8 digest_size; + struct rcu_head rcu; + u8 traffic_keys[]; +}; + +static inline u8 *rcv_other_key(struct tcp_ao_key *key) +{ + return key->traffic_keys; +} + +static inline u8 *snd_other_key(struct tcp_ao_key *key) +{ + return key->traffic_keys + key->digest_size; +} + +static inline int tcp_ao_maclen(const struct tcp_ao_key *key) +{ + return key->maclen; +} + +static inline int tcp_ao_sizeof_key(const struct tcp_ao_key *key) +{ + return sizeof(struct tcp_ao_key) + (TCP_AO_MAX_HASH_SIZE << 1); +} + +static inline int tcp_ao_len(const struct tcp_ao_key *key) +{ + return tcp_ao_maclen(key) + sizeof(struct tcp_ao_hdr); +} + +static inline unsigned int tcp_ao_digest_size(struct tcp_ao_key *key) +{ + return key->digest_size; +} + +struct tcp_ao_info { + struct hlist_head head; + struct rcu_head rcu; + /* current_key and rnext_key aren't maintained on listen sockets. + * Their purpose is to cache keys on established connections, + * saving needless lookups. Never dereference any of them from + * listen sockets. + */ + struct tcp_ao_key *volatile current_key; + struct tcp_ao_key *rnext_key; + u8 ao_flags; + __be32 lisn; + __be32 risn; + u32 snd_sne; + u32 snd_sne_seq; + u32 rcv_sne; + u32 rcv_sne_seq; +}; + +#endif /* _TCP_AO_H */ diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 8fc09e8638b3..849bbf2d3c38 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -342,6 +342,8 @@ struct tcp_diag_md5sig { __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; }; +#define TCP_AO_MAXKEYLEN 80 + /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ #define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1 diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index c341864e4398..89bd0e9d97fe 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -731,6 +731,19 @@ config DEFAULT_TCP_CONG default "bbr" if DEFAULT_BBR default "cubic" +config TCP_AO + bool "TCP: Authentication Option (rfc5925)" + select CRYPTO + select CRYPTO_POOL + select TCP_MD5SIG + depends on 64BIT # seq-number extension needs WRITE_ONCE(u64) + default y + help + TCP-AO specifies the use of stronger Message Authentication Codes (MACs), + protects against replays for long-lived TCP connections, and + provides more details on the association of security with TCP + connections than TCP MD5 (See RFC5925) + config TCP_MD5SIG bool "TCP: MD5 Signature Option support (RFC2385)" select CRYPTO_POOL -- 2.37.2