From patchwork Wed Jul 19 20:26:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13319486 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 1FD1422EF4 for ; Wed, 19 Jul 2023 20:27:47 +0000 (UTC) Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F01C2D47 for ; Wed, 19 Jul 2023 13:27:16 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id 5b1f17b1804b1-3fbd33a57b6so241945e9.2 for ; Wed, 19 Jul 2023 13:27:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1689798432; x=1692390432; 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=M0YKNE2+amayxLfi3omxH88JRdL+2mXdNeGvNaY3zP0=; b=dGR7SOZRIPvuIFdo0edAd54tqTWak/sdOol7nCfJZ0mJKJ62zDP+K5Jq6Z36lK4CVK BW8yNPEKcdHlnJhztgGK+V+YqrR2T5I+8NQtP6FkAMpQruvu1sahioz1x4andyjdEthl ynpksjwguN7kD4+JXuyfdweUc2yrdKxhm8oC+PUryk81VE+dScHeln0NX9QzMhnQpbaC wX35HrxZHRj6aNQWjlN6DYuoz+ck+bucIOfXghh9RrDH+VhI0/1nD2ofuxrLHcd5RijP 7OPwmw2vQxRpkuMmZ6HVGp5GTtll9Ykecu1qnfuy7IdB1ZV4/gpGh3x+eg3nkOkblzUw NEoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689798432; x=1692390432; 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=M0YKNE2+amayxLfi3omxH88JRdL+2mXdNeGvNaY3zP0=; b=KWs2gUCwvJVozJ2068mYAFIiTof0hvqf1mzKVETlKhzZN+s1Shj4BVKfXXql9Byl6c EV92cGzde5QkF4o/waPz76WcSCHv6Zo1ms4w/1XV5BkV57KRweuwYAZuFHQfL5Xa3uyL 5GxHbjMlrNRV+oAdzuetKnLF/dYdQQ++nIDQ3+LkQhfEWNmVIrUealWPZ+FVegYTsJTP 762WSY4CE6xgjextJ1NshOoTN3b15h4sp+vupGWQlRGwNuBKCo2HBnGyZsTnIh7p1NPS udlZj2GjMHJOFiqMFEkGGqGaxcJxV5jwRZIlyXGZZiTXH/0yyxD6NgHEBCBP25Ldqb0+ bCqg== X-Gm-Message-State: ABy/qLbb04ox3TV6yk8k9GzYmz2uhefcrvmn/5KzJEscqwe3qoySUfYP 7qZPtpnyLBE2UNJiYiH9nXbSuQ== X-Google-Smtp-Source: APBJJlGjwg21EeKCHMTZ3E3xhsbD8y4UI0o/ozO2hDTo55KkjZtIj9Qcz1LPCF4fDbRjntC2oAdeSA== X-Received: by 2002:a1c:ed08:0:b0:3fa:97ad:2b9f with SMTP id l8-20020a1ced08000000b003fa97ad2b9fmr5669143wmh.16.1689798432158; Wed, 19 Jul 2023 13:27:12 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id 3-20020a05600c234300b003fc04d13242sm2432319wmq.0.2023.07.19.13.27.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Jul 2023 13:27:11 -0700 (PDT) From: Dmitry Safonov To: David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: linux-kernel@vger.kernel.org, Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Donald Cassidy , Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , "Gaillardetz, Dominik" , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , "Tetreault, Francois" , netdev@vger.kernel.org Subject: [PATCH v8 20/23] net/tcp: Add static_key for TCP-AO Date: Wed, 19 Jul 2023 21:26:25 +0100 Message-ID: <20230719202631.472019-21-dima@arista.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230719202631.472019-1-dima@arista.com> References: <20230719202631.472019-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Similarly to TCP-MD5, add a static key to TCP-AO that is patched out when there are no keys on a machine and dynamically enabled with the first setsockopt(TCP_AO) adds a key on any socket. The static key is as well dynamically disabled later when the socket is destructed. The lifetime of enabled static key here is the same as ao_info: it is enabled on allocation, passed over from full socket to twsk and destructed when ao_info is scheduled for destruction. Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 3 +++ include/net/tcp_ao.h | 2 ++ net/ipv4/tcp_ao.c | 22 +++++++++++++++++++++ net/ipv4/tcp_input.c | 46 +++++++++++++++++++++++++++++--------------- 4 files changed, 57 insertions(+), 16 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 61dd9a8afaf1..a93591a4e42d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2580,6 +2580,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, struct tcp_ao_info *ao_info; struct tcp_ao_key *ao_key; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return false; + ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao_info) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 9209343878e1..e6d849d7179e 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -152,6 +152,8 @@ do { \ #ifdef CONFIG_TCP_AO /* TCP-AO structures and functions */ +#include +extern struct static_key_false_deferred tcp_ao_needed; struct tcp4_ao_context { __be32 saddr; diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 567aa9400f7d..54b35ee1edf1 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -17,6 +17,8 @@ #include #include +DEFINE_STATIC_KEY_DEFERRED_FALSE(tcp_ao_needed, HZ); + int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len, struct tcp_sigpool *hp) { @@ -50,6 +52,9 @@ bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code) struct tcp_ao_info *ao; bool ignore_icmp = false; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return false; + /* RFC5925, 7.8: * >> A TCP-AO implementation MUST default to ignore incoming ICMPv4 * messages of Type 3 (destination unreachable), Codes 2-4 (protocol @@ -188,6 +193,9 @@ static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, struct tcp_ao_key *key; struct tcp_ao_info *ao; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return NULL; + ao = rcu_dereference_check(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao) @@ -281,6 +289,7 @@ void tcp_ao_destroy_sock(struct sock *sk, bool twsk) } kfree_rcu(ao, rcu); + static_branch_slow_dec_deferred(&tcp_ao_needed); } void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp) @@ -1142,6 +1151,11 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, goto free_and_exit; } + if (!static_key_fast_inc_not_disabled(&tcp_ao_needed.key.key)) { + ret = -EUSERS; + goto free_and_exit; + } + key_head = rcu_dereference(hlist_first_rcu(&new_ao->head)); first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node); @@ -1585,6 +1599,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, tcp_ao_link_mkt(ao_info, key); if (first) { + if (!static_branch_inc(&tcp_ao_needed.key)) { + ret = -EUSERS; + goto err_free_sock; + } sk_gso_disable(sk); rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); } @@ -1850,6 +1868,10 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, if (new_rnext) WRITE_ONCE(ao_info->rnext_key, new_rnext); if (first) { + if (!static_branch_inc(&tcp_ao_needed.key)) { + err = -EUSERS; + goto out; + } sk_gso_disable(sk); rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); } diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 63c2e42dc2d2..acf09124d6d0 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3524,41 +3524,55 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp, (ack_seq == tp->snd_wl1 && nwin > tp->snd_wnd); } -/* If we update tp->snd_una, also update tp->bytes_acked */ -static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) +static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack) { - u32 delta = ack - tp->snd_una; #ifdef CONFIG_TCP_AO struct tcp_ao_info *ao; -#endif - sock_owned_by_me((struct sock *)tp); - tp->bytes_acked += delta; -#ifdef CONFIG_TCP_AO + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return; + ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held((struct sock *)tp)); if (ao && ack < tp->snd_una) ao->snd_sne++; #endif +} + +/* If we update tp->snd_una, also update tp->bytes_acked */ +static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) +{ + u32 delta = ack - tp->snd_una; + + sock_owned_by_me((struct sock *)tp); + tp->bytes_acked += delta; + tcp_snd_sne_update(tp, ack); tp->snd_una = ack; } +static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq) +{ +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; + + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return; + + ao = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held((struct sock *)tp)); + if (ao && seq < tp->rcv_nxt) + ao->rcv_sne++; +#endif +} + /* If we update tp->rcv_nxt, also update tp->bytes_received */ static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) { u32 delta = seq - tp->rcv_nxt; -#ifdef CONFIG_TCP_AO - struct tcp_ao_info *ao; -#endif sock_owned_by_me((struct sock *)tp); tp->bytes_received += delta; -#ifdef CONFIG_TCP_AO - ao = rcu_dereference_protected(tp->ao_info, - lockdep_sock_is_held((struct sock *)tp)); - if (ao && seq < tp->rcv_nxt) - ao->rcv_sne++; -#endif + tcp_rcv_sne_update(tp, seq); WRITE_ONCE(tp->rcv_nxt, seq); }