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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20291C5CFC0 for ; Mon, 18 Jun 2018 15:25:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C304A20864 for ; Mon, 18 Jun 2018 15:25:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C304A20864 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arndb.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754882AbeFRPZV (ORCPT ); Mon, 18 Jun 2018 11:25:21 -0400 Received: from mout.kundenserver.de ([212.227.17.13]:52391 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752650AbeFRPZT (ORCPT ); Mon, 18 Jun 2018 11:25:19 -0400 Received: from wuerfel.lan ([95.208.111.237]) by mrelayeu.kundenserver.de (mreue104 [212.227.15.145]) with ESMTPA (Nemesis) id 0MeSpb-1fr8vp0PGR-00QFaP; Mon, 18 Jun 2018 17:24:38 +0200 From: Arnd Bergmann To: Harsh Jain , Herbert Xu , "David S. Miller" , Eric Dumazet , Alexey Kuznetsov , Hideaki YOSHIFUJI , Atul Gupta , Arnd Bergmann , "Gustavo A. R. Silva" Cc: y2038@lists.linaro.org, Michael Werner , Neal Cardwell , Yuchung Cheng , Soheil Hassas Yeganeh , Florian Westphal , Christoph Paasch , Lawrence Brakmo , Ursula Braun , Priyaranjan Jha , Alexei Starovoitov , David Ahern , Ivan Delalande , =?UTF-8?q?Maciej=20=C5=BBenczykowski?= , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next 3/3] tcp: use monotonic timestamps for PAWS Date: Mon, 18 Jun 2018 17:22:15 +0200 Message-Id: <20180618152242.1566661-3-arnd@arndb.de> X-Mailer: git-send-email 2.9.0 In-Reply-To: <20180618152242.1566661-1-arnd@arndb.de> References: <20180618152242.1566661-1-arnd@arndb.de> X-Provags-ID: V03:K1:TUIITLvZu2yN6QopA1uuKmjdlBDhcSlgEpqY1/XmHmVWuiBVdl7 FOVK83eJeO8lOTop4J/298j93XlY6cTdjTrRbkTd+Slt5g5q2IIFUURMLAmI5bwZFQDGi8K QQFpqnTa/wlcZ3CuLEVRaHY2JhFXCXxezguasnvO25rOQI+mEax8p9FvH6Ts3xEOzg3Ez1G z6aEpClIMjMXnU6khg6Dg== X-UI-Out-Filterresults: notjunk:1;V01:K0:PNDTWzFe/kM=:hhAQ7JffTvXK1MENezUmZz z2TFjK9VUrl50gAMJVpThn6GW78mRwnHjNGc7TlAdG57Me0o0ea3MPuz8r28uVB49/CWcz8KZ jpzm4BbDmhrXB6zMkGBiJEknBNdHzOWnNRtLX4QWUWvPlCXBStDmnnuCMp+Aaj7QJZYRMSNR8 HswWAq6F6yKgqf5Akbm7IuwqFVKQrcOJQnhucHmrasTutpgbplxtYwa7eKEkfh78ihQSSmuIT Y7tXx/EUBEtBQaqPLsSDZL80dagFkjkIyX9f/48SjImNFW7UfGAhhjvX4b7uvMTgnHaDx+DTy N2TY4cZHmHbAmqRJBoQeNYYryFihI6+8cfPXXvyFNS+aJR5bNzVqvKwa3fN5DlfRKWDaLMOXZ yEwnIhh+MqOfUQG0EGfoXWoev+z8tywT0g9w+GorGGM3IhQhz4fJstye3vNV1aRnYulndkrx0 9Cd9jrhsaqstgR43rtcScgwMXw/Kxz+Mn0m/m/UlOBMecunhg57oKToVgzdtJ/ym8QR741+/6 NxWAKGjdOYreq6U7lOMplWHWTIgwzTroqvLHAaTPuKXGlFbJGfDbN4y6lQLy+0wFO4GUeax0r FfMFu6W8iCFDqbNn35E8x+DRSTVvuaUsmBcdgDhj6ciJMdJHnuvOKbbVwAZP4iGT5r6DZ29qF /ouK8tIVzyElWWrMN8WdkrcU++l/RXLg7ALLnRxo0erM1yyAeIja0sszzT0nI17d8vx0= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Using get_seconds() for timestamps is deprecated since it can lead to overflows on 32-bit systems. While the interface generally doesn't overflow until year 2106, the specific implementation of the TCP PAWS algorithm breaks in 2038 when the intermediate signed 32-bit timestamps overflow. A related problem is that the local timestamps in CLOCK_REALTIME form lead to unexpected behavior when settimeofday is called to set the system clock backwards or forwards by more than 24 days. While the first problem could be solved by using an overflow-safe method of comparing the timestamps, a nicer solution is to use a monotonic clocksource with ktime_get_seconds() that simply doesn't overflow (at least not until 136 years after boot) and that doesn't change during settimeofday(). To make 32-bit and 64-bit architectures behave the same way here, and also save a few bytes in the tcp_options_received structure, I'm changing the type to a 32-bit integer, which is now safe on all architectures. Finally, the ts_recent_stamp field also (confusingly) gets used to store a jiffies value in tcp_synq_overflow()/tcp_synq_no_recent_overflow(). This is currently safe, but changing the type to 32-bit requires some small changes there to keep it working. Signed-off-by: Arnd Bergmann --- drivers/crypto/chelsio/chtls/chtls_cm.c | 2 +- include/linux/tcp.h | 4 ++-- include/net/tcp.h | 15 ++++++++------- net/ipv4/tcp_input.c | 2 +- net/ipv4/tcp_ipv4.c | 2 +- net/ipv4/tcp_minisocks.c | 8 ++++---- 6 files changed, 17 insertions(+), 16 deletions(-) diff --git a/drivers/crypto/chelsio/chtls/chtls_cm.c b/drivers/crypto/chelsio/chtls/chtls_cm.c index 2bb6f0380758..0997e166ea57 100644 --- a/drivers/crypto/chelsio/chtls/chtls_cm.c +++ b/drivers/crypto/chelsio/chtls/chtls_cm.c @@ -1673,7 +1673,7 @@ static void chtls_timewait(struct sock *sk) struct tcp_sock *tp = tcp_sk(sk); tp->rcv_nxt++; - tp->rx_opt.ts_recent_stamp = get_seconds(); + tp->rx_opt.ts_recent_stamp = ktime_get_seconds(); tp->srtt_us = 0; tcp_time_wait(sk, TCP_TIME_WAIT, 0); } diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 72705eaf4b84..f911b9b09b16 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -89,7 +89,7 @@ struct tcp_sack_block { struct tcp_options_received { /* PAWS/RTTM data */ - long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ + int ts_recent_stamp;/* Time we stored ts_recent (for aging) */ u32 ts_recent; /* Time stamp to echo next */ u32 rcv_tsval; /* Time stamp value */ u32 rcv_tsecr; /* Time stamp echo reply */ @@ -425,7 +425,7 @@ struct tcp_timewait_sock { /* The time we sent the last out-of-window ACK: */ u32 tw_last_oow_ack_time; - long tw_ts_recent_stamp; + int tw_ts_recent_stamp; #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *tw_md5_key; #endif diff --git a/include/net/tcp.h b/include/net/tcp.h index 0448e7c5d2b4..f8c32dc36ea1 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -471,19 +471,20 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb); */ static inline void tcp_synq_overflow(const struct sock *sk) { - unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; - unsigned long now = jiffies; + unsigned int last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; + unsigned int now = jiffies; - if (time_after(now, last_overflow + HZ)) + if (time_after32(now, last_overflow + HZ)) tcp_sk(sk)->rx_opt.ts_recent_stamp = now; } /* syncookies: no recent synqueue overflow on this listening socket? */ static inline bool tcp_synq_no_recent_overflow(const struct sock *sk) { - unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; + unsigned int last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp; + unsigned int now = jiffies; - return time_after(jiffies, last_overflow + TCP_SYNCOOKIE_VALID); + return time_after32(now, last_overflow + TCP_SYNCOOKIE_VALID); } static inline u32 tcp_cookie_time(void) @@ -1361,7 +1362,7 @@ static inline bool tcp_paws_check(const struct tcp_options_received *rx_opt, { if ((s32)(rx_opt->ts_recent - rx_opt->rcv_tsval) <= paws_win) return true; - if (unlikely(get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)) + if (unlikely(ktime_get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_24DAYS)) return true; /* * Some OSes send SYN and SYNACK messages with tsval=0 tsecr=0, @@ -1391,7 +1392,7 @@ static inline bool tcp_paws_reject(const struct tcp_options_received *rx_opt, However, we can relax time bounds for RST segments to MSL. */ - if (rst && get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL) + if (rst && ktime_get_seconds() >= rx_opt->ts_recent_stamp + TCP_PAWS_MSL) return false; return true; } diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 355d3dffd021..0eb314774aec 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3449,7 +3449,7 @@ static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb) static void tcp_store_ts_recent(struct tcp_sock *tp) { tp->rx_opt.ts_recent = tp->rx_opt.rcv_tsval; - tp->rx_opt.ts_recent_stamp = get_seconds(); + tp->rx_opt.ts_recent_stamp = ktime_get_seconds(); } static void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index bea17f1e8302..41d03153c5bf 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -155,7 +155,7 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) and use initial timestamp retrieved from peer table. */ if (tcptw->tw_ts_recent_stamp && - (!twp || (reuse && get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { + (!twp || (reuse && ktime_get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; if (tp->write_seq == 0) tp->write_seq = 1; diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 1dda1341a223..1f652beb79ca 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -144,7 +144,7 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb, tw->tw_substate = TCP_TIME_WAIT; tcptw->tw_rcv_nxt = TCP_SKB_CB(skb)->end_seq; if (tmp_opt.saw_tstamp) { - tcptw->tw_ts_recent_stamp = get_seconds(); + tcptw->tw_ts_recent_stamp = ktime_get_seconds(); tcptw->tw_ts_recent = tmp_opt.rcv_tsval; } @@ -189,7 +189,7 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb, if (tmp_opt.saw_tstamp) { tcptw->tw_ts_recent = tmp_opt.rcv_tsval; - tcptw->tw_ts_recent_stamp = get_seconds(); + tcptw->tw_ts_recent_stamp = ktime_get_seconds(); } inet_twsk_put(tw); @@ -534,7 +534,7 @@ struct sock *tcp_create_openreq_child(const struct sock *sk, if (newtp->rx_opt.tstamp_ok) { newtp->rx_opt.ts_recent = req->ts_recent; - newtp->rx_opt.ts_recent_stamp = get_seconds(); + newtp->rx_opt.ts_recent_stamp = ktime_get_seconds(); newtp->tcp_header_len = sizeof(struct tcphdr) + TCPOLEN_TSTAMP_ALIGNED; } else { newtp->rx_opt.ts_recent_stamp = 0; @@ -600,7 +600,7 @@ struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb, * it can be estimated (approximately) * from another data. */ - tmp_opt.ts_recent_stamp = get_seconds() - ((TCP_TIMEOUT_INIT/HZ)<num_timeout); + tmp_opt.ts_recent_stamp = ktime_get_seconds() - ((TCP_TIMEOUT_INIT/HZ)<num_timeout); paws_reject = tcp_paws_reject(&tmp_opt, th->rst); } } -- 2.9.0