From patchwork Mon Jun 21 01:38:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xin Long X-Patchwork-Id: 464915 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=unavailable 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 AF3E6C48BDF for ; Mon, 21 Jun 2021 01:39:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A4F36120D for ; Mon, 21 Jun 2021 01:39:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230496AbhFUBld (ORCPT ); Sun, 20 Jun 2021 21:41:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230388AbhFUBlW (ORCPT ); Sun, 20 Jun 2021 21:41:22 -0400 Received: from mail-qk1-x72e.google.com (mail-qk1-x72e.google.com [IPv6:2607:f8b0:4864:20::72e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DFE9C061283; Sun, 20 Jun 2021 18:39:06 -0700 (PDT) Received: by mail-qk1-x72e.google.com with SMTP id f70so26344716qke.13; Sun, 20 Jun 2021 18:39:06 -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=QeYkNlsQAUc0g3jSubDuw+9XlgHH10D5q9pEpDcDQCg=; b=D7/ejBjlaOfJo/KwgM1gqQP1GPXlQSO/93Ai5Zkit76hWfxMWDZeoPrhhOyNpYo7p5 TqOr6YEEN0asrN2m8ViKMnr6qZr8F38S+rc23uvycH4yf61hzfpXsn5istUFnNjvc+OW ELQU9uJYA3xA2m4/64Jr1E2xFu1YAPFu+hHKYrT3AUwP1TBbZCPIYgLcRdCwaLL2O2cS aHw8QZTdCGdvJJ60VJPvsTwq7l8jfbwUVEOsWdIieS3TA5jBH4jbSAmBozwsXxOxW6My C9N3dYPmCf3CUJyMAfXL+t4eZfxHNqH1yWIL4wzawZDJRsR/ogdsRP9+rci3iskxA6TS SQkA== 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=QeYkNlsQAUc0g3jSubDuw+9XlgHH10D5q9pEpDcDQCg=; b=t8fkkkJVtnQjfUP/IDFalPsQUn4vMasHuD2ThxuVaNw8sc2Zm2R5ltiq/4Wh6X/AeL 6YzFiswqLCk7sCSbYjqtmDAu26fYJY7U1/glva6AK65gubrVvIPdshjUtTpCV2qDLaHY FfVLgWNWPqs4ZxBenxGhSzjnVGxIVAux4SrurIahCxrkdOIWJsHOv4d9LzIEw6hXh1Ix pIi8QbpjoPfq2uHwaXYRUk8cMgsfbOnlBbCCExHCxuRkr3BpkGVnoKpCClBfeIHPUMkK oXJO2/+PwuQ+0wfj6nayeUafNZlWOm8LZ3mH9EjN4dzL90fplbqEXsuJjljDXB5oQa8T Qj3A== X-Gm-Message-State: AOAM531fe7wHw3FnEQ1nftfJix/hwW8mKrQk2hJhRpc93N8mS1F6oIf9 exicRUU8DBtNz8kGhhkLqZAIc3gX95M4Sg== X-Google-Smtp-Source: ABdhPJxLKwCjqaSY4gqUKvpSONWXGHYhG872CXi3OvMHxAwQm0nWqRnglYsxBCAGc/fcJ85B4VWPTg== X-Received: by 2002:a37:b942:: with SMTP id j63mr21090735qkf.430.1624239545097; Sun, 20 Jun 2021 18:39:05 -0700 (PDT) Received: from localhost (nat-pool-bos-t.redhat.com. [66.187.233.206]) by smtp.gmail.com with ESMTPSA id c11sm9665275qth.29.2021.06.20.18.39.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Jun 2021 18:39:04 -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 13/14] sctp: extract sctp_v4_err_handle function from sctp_v4_err Date: Sun, 20 Jun 2021 21:38:48 -0400 Message-Id: <3edcb79df827260f7b94559e1b6cfe58fca53f54.1624239422.git.lucien.xin@gmail.com> 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 This patch is to extract sctp_v4_err_handle() from sctp_v4_err() to only handle the icmp err after the sock lookup, and it also makes the code clearer. sctp_v4_err_handle() will be used in sctp over udp's err handling in the following patch. Signed-off-by: Xin Long --- net/sctp/input.c | 106 ++++++++++++++++++++++------------------------- 1 file changed, 49 insertions(+), 57 deletions(-) diff --git a/net/sctp/input.c b/net/sctp/input.c index 9ffdbd6526e9..83d58d42ea45 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -556,6 +556,49 @@ void sctp_err_finish(struct sock *sk, struct sctp_transport *t) sctp_transport_put(t); } +static void sctp_v4_err_handle(struct sctp_transport *t, struct sk_buff *skb, + __u8 type, __u8 code, __u32 info) +{ + struct sctp_association *asoc = t->asoc; + struct sock *sk = asoc->base.sk; + int err = 0; + + switch (type) { + case ICMP_PARAMETERPROB: + err = EPROTO; + break; + case ICMP_DEST_UNREACH: + if (code > NR_ICMP_UNREACH) + return; + if (code == ICMP_FRAG_NEEDED) { + sctp_icmp_frag_needed(sk, asoc, t, SCTP_TRUNC4(info)); + return; + } + if (code == ICMP_PROT_UNREACH) { + sctp_icmp_proto_unreachable(sk, asoc, t); + return; + } + err = icmp_err_convert[code].errno; + break; + case ICMP_TIME_EXCEEDED: + if (code == ICMP_EXC_FRAGTIME) + return; + + err = EHOSTUNREACH; + break; + case ICMP_REDIRECT: + sctp_icmp_redirect(sk, t, skb); + default: + return; + } + if (!sock_owned_by_user(sk) && inet_sk(sk)->recverr) { + sk->sk_err = err; + sk->sk_error_report(sk); + } else { /* Only an error on timeout */ + sk->sk_err_soft = err; + } +} + /* * This routine is called by the ICMP module when it gets some * sort of error condition. If err < 0 then the socket should @@ -574,22 +617,19 @@ void sctp_err_finish(struct sock *sk, struct sctp_transport *t) int sctp_v4_err(struct sk_buff *skb, __u32 info) { const struct iphdr *iph = (const struct iphdr *)skb->data; - const int ihlen = iph->ihl * 4; const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; - struct sock *sk; - struct sctp_association *asoc = NULL; + struct net *net = dev_net(skb->dev); struct sctp_transport *transport; - struct inet_sock *inet; + struct sctp_association *asoc; __u16 saveip, savesctp; - int err; - struct net *net = dev_net(skb->dev); + struct sock *sk; /* Fix up skb to look at the embedded net header. */ saveip = skb->network_header; savesctp = skb->transport_header; skb_reset_network_header(skb); - skb_set_transport_header(skb, ihlen); + skb_set_transport_header(skb, iph->ihl * 4); sk = sctp_err_lookup(net, AF_INET, skb, sctp_hdr(skb), &asoc, &transport); /* Put back, the original values. */ skb->network_header = saveip; @@ -598,58 +638,10 @@ int sctp_v4_err(struct sk_buff *skb, __u32 info) __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); return -ENOENT; } - /* Warning: The sock lock is held. Remember to call - * sctp_err_finish! - */ - switch (type) { - case ICMP_PARAMETERPROB: - err = EPROTO; - break; - case ICMP_DEST_UNREACH: - if (code > NR_ICMP_UNREACH) - goto out_unlock; - - /* PMTU discovery (RFC1191) */ - if (ICMP_FRAG_NEEDED == code) { - sctp_icmp_frag_needed(sk, asoc, transport, - SCTP_TRUNC4(info)); - goto out_unlock; - } else { - if (ICMP_PROT_UNREACH == code) { - sctp_icmp_proto_unreachable(sk, asoc, - transport); - goto out_unlock; - } - } - err = icmp_err_convert[code].errno; - break; - case ICMP_TIME_EXCEEDED: - /* Ignore any time exceeded errors due to fragment reassembly - * timeouts. - */ - if (ICMP_EXC_FRAGTIME == code) - goto out_unlock; - - err = EHOSTUNREACH; - break; - case ICMP_REDIRECT: - sctp_icmp_redirect(sk, transport, skb); - /* Fall through to out_unlock. */ - default: - goto out_unlock; - } - - inet = inet_sk(sk); - if (!sock_owned_by_user(sk) && inet->recverr) { - sk->sk_err = err; - sk->sk_error_report(sk); - } else { /* Only an error on timeout */ - sk->sk_err_soft = err; - } - -out_unlock: + sctp_v4_err_handle(transport, skb, type, code, info); sctp_err_finish(sk, transport); + return 0; }