From patchwork Fri Mar 5 01:56:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cong Wang X-Patchwork-Id: 12117375 X-Patchwork-Delegate: bpf@iogearbox.net 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 D81F5C433E6 for ; Fri, 5 Mar 2021 01:57:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A95B56500D for ; Fri, 5 Mar 2021 01:57:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229788AbhCEB5M (ORCPT ); Thu, 4 Mar 2021 20:57:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229575AbhCEB5L (ORCPT ); Thu, 4 Mar 2021 20:57:11 -0500 Received: from mail-ot1-x331.google.com (mail-ot1-x331.google.com [IPv6:2607:f8b0:4864:20::331]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57E19C061574; Thu, 4 Mar 2021 17:57:11 -0800 (PST) Received: by mail-ot1-x331.google.com with SMTP id v12so296398ott.10; Thu, 04 Mar 2021 17:57:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=s1GzOzweTwmrvvMSvdXGNYdi6EOSR3K6HzD5+wNMVgQ=; b=QP2rryxtZy0yIJRoKIjB9zV1so3Kpmbt9yC+2n/xMKTHurfbkJO+I67XDxaRasUZI4 jYEfBGAnBKcqTZWUf23sHTwMInKT30VNisy7dySBKR7/gQPYyI69B4HuRqsb3F31RdKb jdQuW7xnYyoMFlQ+nDoebQId+YPj4ryj4yz/hWMReaoh3BMMRlV+pkOk+1YhUzkqB/XX qobGfAxkcNxM8/vmpNH2lgbpOu4UIjcQigQRQn73XF1ce0o04ah0SI7Yl/hxnyLsQETv pLZHNG1iGf/pLB/IUsNYaS4Qq71T1Yeri7PXPcElvI7bnlZfJ84FM0a9/2bQi2xwR4Q9 +64Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=s1GzOzweTwmrvvMSvdXGNYdi6EOSR3K6HzD5+wNMVgQ=; b=oDz5ssxn7GfwNBcxPkSrO1Sy4Eg13O2wnxS/AM205OjjOw7KTRRWLZtu4XflgyZXWb t0u4Akkb5bJ3fe2xN7DknwWzwEfxJycyrMRCJMAE4RWmiJgBDDfB7VKhT4xfCKwfuP7k qjfuSfpQ9RDQpcdyFw2GLW7dmjvh0/sr0i2T/cZqItJ9lQM1GRJqovaOZY7LOWagP2Si 2COs7fGTT64l3yLCN/rXoLWkFXx72y8KtAhDgZ0xYQ1Um542WRSMwipJF/ZjZnkkM2iR Z7g881f9jc0AV+nta/6AwumDcbFEPQZkpYbvk+RbRkCYFUefi121FGB5fGzRHmxtGqwN Xogg== X-Gm-Message-State: AOAM533+vpCSbzvaFcGLB+on7whM/ETkX5Y6Ad1Ka6gwnRWf/oYLUuLs bplN3EMABzSa7RJSBeRdVJLYO49IVGQNaQ== X-Google-Smtp-Source: ABdhPJwEhRD/7NflMm34pkr8bkfN6yhLBwP+EfwcRYBdn1aVM4fgdcNzAJf6yRsgqsT+WcB8nihtmw== X-Received: by 2002:a05:6830:1bc2:: with SMTP id v2mr532390ota.245.1614909430569; Thu, 04 Mar 2021 17:57:10 -0800 (PST) Received: from unknown.attlocal.net ([2600:1700:65a0:ab60:95de:1d5:1b36:946a]) by smtp.gmail.com with ESMTPSA id r3sm224126oif.5.2021.03.04.17.57.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Mar 2021 17:57:10 -0800 (PST) From: Cong Wang To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, duanxiongchun@bytedance.com, wangdongdong.6@bytedance.com, jiang.wang@bytedance.com, Cong Wang , John Fastabend , Daniel Borkmann , Jakub Sitnicki , Lorenz Bauer Subject: [Patch bpf-next v3 4/9] udp: implement ->read_sock() for sockmap Date: Thu, 4 Mar 2021 17:56:50 -0800 Message-Id: <20210305015655.14249-5-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210305015655.14249-1-xiyou.wangcong@gmail.com> References: <20210305015655.14249-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Cong Wang This is similar to tcp_read_sock(), except we do not need to worry about connections, we just need to retrieve skb from UDP receive queue. Cc: John Fastabend Cc: Daniel Borkmann Cc: Jakub Sitnicki Cc: Lorenz Bauer Signed-off-by: Cong Wang --- include/net/udp.h | 2 ++ net/ipv4/af_inet.c | 1 + net/ipv4/udp.c | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 37 insertions(+) diff --git a/include/net/udp.h b/include/net/udp.h index 5264ba1439f9..44a94cfc63b5 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -330,6 +330,8 @@ struct sock *__udp6_lib_lookup(struct net *net, struct sk_buff *skb); struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, __be16 sport, __be16 dport); +int udp_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor); /* UDP uses skb->dev_scratch to cache as much information as possible and avoid * possibly multiple cache miss on dequeue() diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index d8c73a848c53..df8e8e238756 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1072,6 +1072,7 @@ const struct proto_ops inet_dgram_ops = { .getsockopt = sock_common_getsockopt, .sendmsg = inet_sendmsg, .sendmsg_locked = udp_sendmsg_locked, + .read_sock = udp_read_sock, .recvmsg = inet_recvmsg, .mmap = sock_no_mmap, .sendpage = inet_sendpage, diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 424231e910a9..fd8f27ee5b4e 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1798,6 +1798,40 @@ struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, } EXPORT_SYMBOL(__skb_recv_udp); +int udp_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor) +{ + int copied = 0; + + while (1) { + int offset = 0, err; + struct sk_buff *skb; + + skb = __skb_recv_udp(sk, 0, 1, &offset, &err); + if (!skb) + break; + if (offset < skb->len) { + int used; + size_t len; + + len = skb->len - offset; + used = recv_actor(desc, skb, offset, len); + if (used <= 0) { + if (!copied) + copied = used; + break; + } else if (used <= len) { + copied += used; + offset += used; + } + } + if (!desc->count) + break; + } + + return copied; +} + /* * This should be easy, if there is something there we * return it, otherwise we block.