From patchwork Thu Oct 27 20:43:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 619676 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 91E65FA3740 for ; Thu, 27 Oct 2022 20:44:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236905AbiJ0Uoq (ORCPT ); Thu, 27 Oct 2022 16:44:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236896AbiJ0UoW (ORCPT ); Thu, 27 Oct 2022 16:44:22 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E26D92590 for ; Thu, 27 Oct 2022 13:44:06 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id o4so4161942wrq.6 for ; Thu, 27 Oct 2022 13:44:06 -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:subject:date :message-id:reply-to; bh=Tx4iE3mqN7DCr9Gvb0u5N1VFE5hSDH0Bo2werB0KHqI=; b=k/PqpZoEJSu3wMUA6lPEaH88OBn0IqxNQfwO/2dDSQ+1EcR22Qg34IPOk63pQcxTlY g2GjidiGSLKBI0OBRwrz9lIAOerZjca92TFAR2ca4Fjbu5ZuZgRug902F3LgLCo6qSbt M1le4bcsFsq/NrGwroXAqyGIiIErdhlA7i/TdPXjd83fsl6GNslOp67DTt5Ak2o5Kxc9 vZ8YIR3ByEVGYG+2OYhAKZFJrFa42EvIt24MV0hKSnrSVlzCg8kV1ufd93tUxgtQlCIx cv4I4DLBFVVo6FS7SNxweD4eWm8jDvOOT3ERxFHSBwgA5xoLaIrSBCr1Gu/Xaw3KS54k eXgw== 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 :subject:date:message-id:reply-to; bh=Tx4iE3mqN7DCr9Gvb0u5N1VFE5hSDH0Bo2werB0KHqI=; b=fNXlJF+1l5AR4gU9PXUkiBDWkvKjaDsyU4rW74U5E5rhbV/ChTWTI+3b6lrbyFZoki vN3vvEqAJpBTQCU/06Mp7AjRoq70UYELJfT3alBlmUXUitwsDt5jbtPnsRfrRi5wTsGC sFObtN80HWX1b/ivYRsp4WpD5mV2LX2Z+7WI/OoyafejgHIA/KIpCbSOAPy/zpOPoSL1 CuMd/XAvNyWoOWcPYO7cYf4ftv3MLztdOjO2cxUPtTBQP7uTc9e5mg8Evy10yiARmtPG jvrofpRSTFI22ONBoAt9oWc6AWTtTtxNiHTTePrHfrYhLTJBr8ha8Yrirv6EzxkZBXF5 DqXg== X-Gm-Message-State: ACrzQf35DOyhojuZbILWfIU3oXgUkNsQUIhbog0pGRLP+pI3Pl9bTcGG 02pNssFTDH2nZEmrsv9lEs/MQw== X-Google-Smtp-Source: AMsMyM4ssOcJNh0i5IJBtAtszTpkSoBGAqeg5vcYzmvVp0UgUym6nlNFgCiBwnX0xmpjrZqx+B/OAg== X-Received: by 2002:adf:e510:0:b0:235:de50:72ff with SMTP id j16-20020adfe510000000b00235de5072ffmr25535605wrm.100.1666903445792; Thu, 27 Oct 2022 13:44:05 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n3-20020a5d6b83000000b00236644228besm1968739wrx.40.2022.10.27.13.44.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Oct 2022 13:44:05 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , "David S. Miller" , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , 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 v3 07/36] tcp: Add TCP-AO config and structures Date: Thu, 27 Oct 2022 21:43:18 +0100 Message-Id: <20221027204347.529913-8-dima@arista.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221027204347.529913-1-dima@arista.com> References: <20221027204347.529913-1-dima@arista.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@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 | 9 +++- include/net/tcp.h | 8 +--- include/net/tcp_ao.h | 90 ++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/tcp.h | 2 + net/ipv4/Kconfig | 12 ++++++ 5 files changed, 113 insertions(+), 8 deletions(-) create mode 100644 include/net/tcp_ao.h diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 41b1da621a45..fd248875b0a9 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -434,13 +434,18 @@ struct tcp_sock { bool syn_smc; /* SYN includes SMC */ #endif -#ifdef CONFIG_TCP_MD5SIG -/* TCP AF-Specific parts; only used by MD5 Signature support so far */ +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) +/* TCP AF-Specific parts; only used by TCP-AO/MD5 Signature support so far */ const struct tcp_sock_af_ops *af_specific; +#ifdef CONFIG_TCP_MD5SIG /* 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 +#endif /* TCP fastopen related information */ struct tcp_fastopen_request *fastopen_req; diff --git a/include/net/tcp.h b/include/net/tcp.h index 03dbe1940fec..3395a925dc6e 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -1615,12 +1616,7 @@ 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..4a78f3e0199e 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -731,6 +731,18 @@ config DEFAULT_TCP_CONG default "bbr" if DEFAULT_BBR default "cubic" +config TCP_AO + bool "TCP: Authentication Option (RFC5925)" + select CRYPTO + select CRYPTO_POOL + 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