From patchwork Mon Jun 21 01:38:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xin Long X-Patchwork-Id: 464920 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 02FE0C49EA3 for ; Mon, 21 Jun 2021 01:39:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DEF9B61208 for ; Mon, 21 Jun 2021 01:39:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230283AbhFUBlO (ORCPT ); Sun, 20 Jun 2021 21:41:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230186AbhFUBlK (ORCPT ); Sun, 20 Jun 2021 21:41:10 -0400 Received: from mail-qv1-xf2a.google.com (mail-qv1-xf2a.google.com [IPv6:2607:f8b0:4864:20::f2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72CEFC061766; Sun, 20 Jun 2021 18:38:56 -0700 (PDT) Received: by mail-qv1-xf2a.google.com with SMTP id dj3so6659323qvb.11; Sun, 20 Jun 2021 18:38:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=6OYdRpBLs7VDSwhTJfhbtTJc4ISXR6JPdRpeI95wWus=; b=AXPNsbR5ETPLXBRpUMaNbDdLz2uMRoOLu6y/i/p1B9nN8xMduLAEhE9ChrOq4CNCE8 C6FYPXUhlChP+d9dQ7vhrm8yQfAqviaLT/w+Mwvb44RfZFqpCiG0uSMaylMp7oPSprtz 0m/jtHwE3fFUAXFiPhBOs/YxZK+R6TppCYHe/LLvSDHPGFWvjQEnICfCxStWSPzVc3qr 4l2scFNLTYuOyXd7DuJfKmz8m1TWmbeG9BqVxIClsG37YMlDkuElxH9UZlSWN8hcCNnn bCbwAXIidb6+hKu07xeGF2t8GjckU877PVL5DzZhDY27lmm/AereAb18lZHFckzoW1wP KO6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6OYdRpBLs7VDSwhTJfhbtTJc4ISXR6JPdRpeI95wWus=; b=fkcryEsMvln3jF/5n3sVZz2ohGUywp3gv8ix/XeZtqVce1FFp0yItoKFusv76zmROz uIDHmCw4DKtLFKtnu9QXcfnrRu+vuZ27sGCYBZYtV9sfr36j+kqxqHC4RTEZFc2M9+Ti /V27+BeE6U6L2yq/cj5kYTi4RuvsMAROV9pJBT/hO5EUE6JdNXM5tLM4lsNKy8gCRf9f lazbu8WylV3wXlbADV6xhtAU2gUxdPJCVyvR6kYLJO0ypdHRlceuqynU+Ubm9Lh7QAqG PLmP8AQ1DY5PNKK5c2KmmuaTgMnBHvD5es90tFYaCgUeRllWbUpgBoGfIXdJKWHcTR/B S+TA== X-Gm-Message-State: AOAM5325Qg9/HtfjpRNa2XU9hz/rSi+xMMPzzebq9Ra+KXTbUhFnZO/F KRktDNLtkYK1svhIwJ5Qm/VvDGaogSwy/Q== X-Google-Smtp-Source: ABdhPJzLTkBQQJ8UbsGRJZFlB8/vpHTeNLqpiUMh3XcGd+CPt09zDoQO5wnDjoehe8BwpKGQhmebig== X-Received: by 2002:a0c:e18c:: with SMTP id p12mr9057333qvl.54.1624239535465; Sun, 20 Jun 2021 18:38:55 -0700 (PDT) Received: from localhost (nat-pool-bos-t.redhat.com. [66.187.233.206]) by smtp.gmail.com with ESMTPSA id u18sm9710045qta.38.2021.06.20.18.38.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Jun 2021 18:38:55 -0700 (PDT) From: Xin Long To: network dev , davem@davemloft.net, kuba@kernel.org, Marcelo Ricardo Leitner , linux-sctp@vger.kernel.org Subject: [PATCH net-next 04/14] sctp: add the constants/variables and states and some APIs for transport Date: Sun, 20 Jun 2021 21:38:39 -0400 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org These are 4 constants described in rfc8899#section-5.1.2: MAX_PROBES, MIN_PLPMTU, MAX_PLPMTU, BASE_PLPMTU; And 2 variables described in rfc8899#section-5.1.3: PROBED_SIZE, PROBE_COUNT; And 5 states described in rfc8899#section-5.2: DISABLED, BASE, SEARCH, SEARCH_COMPLETE, ERROR; And these 4 APIs are used to reset/update PLPMTUD, check if PLPMTUD is enabled, and calculate the additional headers length for a transport. Note the member 'probe_high' in transport will be set to the probe size when a probe fails with this probe size in the next patches. Signed-off-by: Xin Long --- include/net/sctp/constants.h | 17 +++++++++++++ include/net/sctp/sctp.h | 48 +++++++++++++++++++++++++++++++++--- include/net/sctp/structs.h | 8 ++++++ 3 files changed, 70 insertions(+), 3 deletions(-) diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h index 449cf9cb428b..85f6a105c59d 100644 --- a/include/net/sctp/constants.h +++ b/include/net/sctp/constants.h @@ -200,6 +200,23 @@ enum sctp_sock_state { SCTP_SS_CLOSING = TCP_CLOSE_WAIT, }; +enum sctp_plpmtud_state { + SCTP_PL_DISABLED, + SCTP_PL_BASE, + SCTP_PL_SEARCH, + SCTP_PL_COMPLETE, + SCTP_PL_ERROR, +}; + +#define SCTP_BASE_PLPMTU 1200 +#define SCTP_MAX_PLPMTU 9000 +#define SCTP_MIN_PLPMTU 512 + +#define SCTP_MAX_PROBES 3 + +#define SCTP_PL_BIG_STEP 32 +#define SCTP_PL_MIN_STEP 4 + /* These functions map various type to printable names. */ const char *sctp_cname(const union sctp_subtype id); /* chunk types */ const char *sctp_oname(const union sctp_subtype id); /* other events */ diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h index 86f74f2fe6de..08347d3f004f 100644 --- a/include/net/sctp/sctp.h +++ b/include/net/sctp/sctp.h @@ -573,14 +573,15 @@ static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport * /* Calculate max payload size given a MTU, or the total overhead if * given MTU is zero */ -static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp, - __u32 mtu, __u32 extra) +static inline __u32 __sctp_mtu_payload(const struct sctp_sock *sp, + const struct sctp_transport *t, + __u32 mtu, __u32 extra) { __u32 overhead = sizeof(struct sctphdr) + extra; if (sp) { overhead += sp->pf->af->net_header_len; - if (sp->udp_port) + if (sp->udp_port && (!t || t->encap_port)) overhead += sizeof(struct udphdr); } else { overhead += sizeof(struct ipv6hdr); @@ -592,6 +593,12 @@ static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp, return mtu ? mtu - overhead : overhead; } +static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp, + __u32 mtu, __u32 extra) +{ + return __sctp_mtu_payload(sp, NULL, mtu, extra); +} + static inline __u32 sctp_dst_mtu(const struct dst_entry *dst) { return SCTP_TRUNC4(max_t(__u32, dst_mtu(dst), @@ -615,6 +622,41 @@ static inline __u32 sctp_min_frag_point(struct sctp_sock *sp, __u16 datasize) return sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, datasize); } +static inline int sctp_transport_pl_hlen(struct sctp_transport *t) +{ + return __sctp_mtu_payload(sctp_sk(t->asoc->base.sk), t, 0, 0); +} + +static inline void sctp_transport_pl_reset(struct sctp_transport *t) +{ + if (t->probe_interval && (t->param_flags & SPP_PMTUD_ENABLE) && + (t->state == SCTP_ACTIVE || t->state == SCTP_UNKNOWN)) { + if (t->pl.state == SCTP_PL_DISABLED) { + t->pl.state = SCTP_PL_BASE; + t->pl.pmtu = SCTP_BASE_PLPMTU; + t->pl.probe_size = SCTP_BASE_PLPMTU; + } + } else { + if (t->pl.state != SCTP_PL_DISABLED) + t->pl.state = SCTP_PL_DISABLED; + } +} + +static inline void sctp_transport_pl_update(struct sctp_transport *t) +{ + if (t->pl.state == SCTP_PL_DISABLED) + return; + + t->pl.state = SCTP_PL_BASE; + t->pl.pmtu = SCTP_BASE_PLPMTU; + t->pl.probe_size = SCTP_BASE_PLPMTU; +} + +static inline bool sctp_transport_pl_enabled(struct sctp_transport *t) +{ + return t->pl.state != SCTP_PL_DISABLED; +} + static inline bool sctp_newsk_ready(const struct sock *sk) { return sock_flag(sk, SOCK_DEAD) || sk->sk_socket; diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index bf5d22deaefb..85d3566c2227 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -978,6 +978,14 @@ struct sctp_transport { char cacc_saw_newack; } cacc; + struct { + __u16 pmtu; + __u16 probe_size; + __u16 probe_high; + __u8 probe_count; + __u8 state; + } pl; /* plpmtud related */ + /* 64-bit random number sent with heartbeat. */ __u64 hb_nonce;