From patchwork Tue Mar 23 00:38:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cong Wang X-Patchwork-Id: 408747 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 7BB0FC433E3 for ; Tue, 23 Mar 2021 00:39:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58B88619AC for ; Tue, 23 Mar 2021 00:39:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231395AbhCWAjP (ORCPT ); Mon, 22 Mar 2021 20:39:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230512AbhCWAic (ORCPT ); Mon, 22 Mar 2021 20:38:32 -0400 Received: from mail-qk1-x734.google.com (mail-qk1-x734.google.com [IPv6:2607:f8b0:4864:20::734]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3F32C061574; Mon, 22 Mar 2021 17:38:31 -0700 (PDT) Received: by mail-qk1-x734.google.com with SMTP id 7so12707308qka.7; Mon, 22 Mar 2021 17:38:31 -0700 (PDT) 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=ktDD3wFfhTgzuwFfQ6FhKlNOYR4srlqkDAegPxHtcbc=; b=gCwCuwwVAIPAWFdKIHS2cH/MCoVfPSeZ2Xm4SDOlgug6/RYQvtrN1A+kJOdOgLrYMR bbzOCzJXjjnFmlbj4MfqFSu805EGPGxg3AXSsh08pNgBEEFp1WyLBt8DQR9dSKSf9IK8 OGwhq8duzfg3X13ADicjD1naoZR9Tw4r8JfPn34LnJUqyF0IzaPWeQfg6irwDeAvQdrB m2wG7ja4p9c+QqBk2/paCZgly63ieuUgNU7h4lcSX//dSasGlbihaRvs6nIVJ2RIFZA8 7R1bLoNR87N3RFcHtfax263LoHZiRJrCqKq/lsHsLEdti4Gu1CWCEkMblrcE8RkIbyqn iXTA== 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=ktDD3wFfhTgzuwFfQ6FhKlNOYR4srlqkDAegPxHtcbc=; b=QF6DwdrYsOsXtpe5943lJ2yv7547SPbGePNA9yf5K8hCcLRuXbW8YCBHnhccIJuGmn GIbc6tfcoCSwGHWkNvQ7o878fQxAFItl4y0njWvCvLauRqpRwM09aE/1K4rPcu5XCAP/ DN3isbt7R4YfGrq1BzLwluhFtGpQwTfrdfX+XHedA20WVSB99a56X/pb8Ngmnp2m/t9V EW+39krGz9ODdyolbP7ZHx/CSRTWzOF5wGxziTfaD+0B5SdBK573VYaAR5WiCAk+eNtb CFlFU8oBGV8J7bzHA+Fa8zijvpyl6WEvmmsco11Dq4ZRsQQwfgKBLC+vzxtretIT8Y4E eBCw== X-Gm-Message-State: AOAM533/rD7agTILJIeLLb3o8m/zhUvHx2nDFFLgJJb1J0dPtTJDhyVT SbXl1b/e/Rnu/Io7VWAuBlbO1dYcd9hZfA== X-Google-Smtp-Source: ABdhPJyyRtG+yM9dxcT/jUVWLrzuyV3mNODLgD9sq5sMhH/i3LIDYlMtmUaSCnt8twqNVwYrkAieUA== X-Received: by 2002:a37:6312:: with SMTP id x18mr2844368qkb.193.1616459910944; Mon, 22 Mar 2021 17:38:30 -0700 (PDT) Received: from unknown.attlocal.net ([2600:1700:65a0:ab60:fda6:6522:f108:7bd8]) by smtp.gmail.com with ESMTPSA id 184sm12356403qki.97.2021.03.22.17.38.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 17:38:30 -0700 (PDT) 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 v6 10/12] udp: implement udp_bpf_recvmsg() for sockmap Date: Mon, 22 Mar 2021 17:38:06 -0700 Message-Id: <20210323003808.16074-11-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210323003808.16074-1-xiyou.wangcong@gmail.com> References: <20210323003808.16074-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Cong Wang We have to implement udp_bpf_recvmsg() to replace the ->recvmsg() to retrieve skmsg from ingress_msg. Cc: John Fastabend Cc: Daniel Borkmann Cc: Jakub Sitnicki Cc: Lorenz Bauer Signed-off-by: Cong Wang --- net/ipv4/udp_bpf.c | 64 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 63 insertions(+), 1 deletion(-) diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c index 6001f93cd3a0..7d5c4ebf42fe 100644 --- a/net/ipv4/udp_bpf.c +++ b/net/ipv4/udp_bpf.c @@ -4,6 +4,68 @@ #include #include #include +#include + +#include "udp_impl.h" + +static struct proto *udpv6_prot_saved __read_mostly; + +static int sk_udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int noblock, int flags, int *addr_len) +{ +#if IS_ENABLED(CONFIG_IPV6) + if (sk->sk_family == AF_INET6) + return udpv6_prot_saved->recvmsg(sk, msg, len, noblock, flags, + addr_len); +#endif + return udp_prot.recvmsg(sk, msg, len, noblock, flags, addr_len); +} + +static int udp_bpf_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, + int nonblock, int flags, int *addr_len) +{ + struct sk_psock *psock; + int copied, ret; + + if (unlikely(flags & MSG_ERRQUEUE)) + return inet_recv_error(sk, msg, len, addr_len); + + psock = sk_psock_get(sk); + if (unlikely(!psock)) + return sk_udp_recvmsg(sk, msg, len, nonblock, flags, addr_len); + + lock_sock(sk); + if (sk_psock_queue_empty(psock)) { + ret = sk_udp_recvmsg(sk, msg, len, nonblock, flags, addr_len); + goto out; + } + +msg_bytes_ready: + copied = sk_msg_recvmsg(sk, psock, msg, len, flags); + if (!copied) { + int data, err = 0; + long timeo; + + timeo = sock_rcvtimeo(sk, nonblock); + data = sk_msg_wait_data(sk, psock, flags, timeo, &err); + if (data) { + if (!sk_psock_queue_empty(psock)) + goto msg_bytes_ready; + ret = sk_udp_recvmsg(sk, msg, len, nonblock, flags, addr_len); + goto out; + } + if (err) { + ret = err; + goto out; + } + copied = -EAGAIN; + } + ret = copied; +out: + release_sock(sk); + sk_psock_put(sk, psock); + return ret; +} enum { UDP_BPF_IPV4, @@ -11,7 +73,6 @@ enum { UDP_BPF_NUM_PROTS, }; -static struct proto *udpv6_prot_saved __read_mostly; static DEFINE_SPINLOCK(udpv6_prot_lock); static struct proto udp_bpf_prots[UDP_BPF_NUM_PROTS]; @@ -20,6 +81,7 @@ static void udp_bpf_rebuild_protos(struct proto *prot, const struct proto *base) *prot = *base; prot->unhash = sock_map_unhash; prot->close = sock_map_close; + prot->recvmsg = udp_bpf_recvmsg; } static void udp_bpf_check_v6_needs_rebuild(struct proto *ops)