From patchwork Mon Apr 19 17:55:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cong Wang X-Patchwork-Id: 424327 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=-12.9 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,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED, 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 8B47DC43461 for ; Mon, 19 Apr 2021 17:56:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5436461246 for ; Mon, 19 Apr 2021 17:56:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240376AbhDSR5S (ORCPT ); Mon, 19 Apr 2021 13:57:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35902 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233851AbhDSR5M (ORCPT ); Mon, 19 Apr 2021 13:57:12 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5FAEC061761; Mon, 19 Apr 2021 10:56:40 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id m6-20020a17090a8586b02901507e1acf0fso3492224pjn.3; Mon, 19 Apr 2021 10:56:40 -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=KoooA+wJKm09yw9keUKD9QS45BXENny998i7q2qmpKg=; b=Oo869W6qJhAtm8VZSiVH1nMLjI/1FlSXATRsf90ErCaqFUySsmS1rpLK8ASr0EzkVc xu4jzbqJxWOc0llPz38OUPbu669Lwb+0T7BwuDNnkOUcFoZ/lE/TIqdWzyMVj+kI1g8Y Q/uWPDyegd7DHk/WfILIDvjxiHn6p7tME0LjxaE3tUz60pojRaFbuN5abIZQ5HctyeOu 0GdZRurIFBuUINxLSq0T2WxJ2yw2XxVJXw29iMuJpa6dIAuYNhYZ31qEkJ0gcGOK8Lo6 ctEHJhqDynchldiecaFO1LzMxZhh67CDTTJfmpQDOEYY+Pd8kiidUiApAU4uoRaebkXB wuKA== 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=KoooA+wJKm09yw9keUKD9QS45BXENny998i7q2qmpKg=; b=DBXf/xqj7WMEqwDabHRXdZH6CiPvsrRPXzFktzUcRUVfBFFe5r3LJLyK9IRk1jIPAv 2LTJymY1WEZIDxHOU+xsc+AyAsXAj/l96S3BsKK1yFGZSDh53lZs0YQZm6QVBGPPDFFJ KkhnqXleJPj8VMf6gzu55vi3pi3+Bcu8SYgYrFFspu0q4PO4ieVZcDI3Jn5KTV1nF+BS X1qBUwlkmj/rHvZtSXyOLNvhpzhJEUICaW/tN/pKKojeactNDq5jXMwn6QZBlCy7qsnM d8WoQLebW4eHL/6MhR1M0iBXC5CVwM+Lv/M689Z6mXgmBeRJSEHVyDUwRO5hJgyxnbbl p4iQ== X-Gm-Message-State: AOAM532iGkuon2DhDzV4gn+F8nqJVZL+C8UEIMF0woata8H5ZqtOXWuX 7vWoqv3PaJnKnxYS+wA+NUYtxnMqsa62uw== X-Google-Smtp-Source: ABdhPJxpgcAprKCSKg+A7ecFr/ita/Sjx0mp8YXtDK7as3VRTW2Q/SPD9xth/yv2fi0ghqLDaudEPw== X-Received: by 2002:a17:90b:188e:: with SMTP id mn14mr310886pjb.148.1618855000415; Mon, 19 Apr 2021 10:56:40 -0700 (PDT) Received: from unknown.attlocal.net ([2600:1700:65a0:ab60:e9c9:f92c:88fa:755e]) by smtp.gmail.com with ESMTPSA id g2sm119660pju.18.2021.04.19.10.56.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Apr 2021 10:56:40 -0700 (PDT) From: Cong Wang To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, jiang.wang@bytedance.com, duanxiongchun@bytedance.com, wangdongdong.6@bytedance.com, Cong Wang , John Fastabend , Daniel Borkmann , Jakub Sitnicki , Lorenz Bauer Subject: [Patch bpf-next v2 1/9] af_unix: implement ->read_sock() for sockmap Date: Mon, 19 Apr 2021 10:55:55 -0700 Message-Id: <20210419175603.19378-2-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210419175603.19378-1-xiyou.wangcong@gmail.com> References: <20210419175603.19378-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Cong Wang Implement ->read_sock() for AF_UNIX datagram socket, it is pretty much similar to udp_read_sock(). Cc: John Fastabend Cc: Daniel Borkmann Cc: Jakub Sitnicki Cc: Lorenz Bauer Signed-off-by: Cong Wang --- net/unix/af_unix.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 5a31307ceb76..966359b64a56 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -661,6 +661,7 @@ static ssize_t unix_stream_splice_read(struct socket *, loff_t *ppos, unsigned int flags); static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t); static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int); +int unix_read_sock(struct sock *sk, read_descriptor_t *desc, sk_read_actor_t recv_actor); static int unix_dgram_connect(struct socket *, struct sockaddr *, int, int); static int unix_seqpacket_sendmsg(struct socket *, struct msghdr *, size_t); @@ -738,6 +739,7 @@ static const struct proto_ops unix_dgram_ops = { .listen = sock_no_listen, .shutdown = unix_shutdown, .sendmsg = unix_dgram_sendmsg, + .read_sock = unix_read_sock, .recvmsg = unix_dgram_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, @@ -2183,6 +2185,41 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg, return err; } +int unix_read_sock(struct sock *sk, read_descriptor_t *desc, + sk_read_actor_t recv_actor) +{ + int copied = 0; + + while (1) { + struct unix_sock *u = unix_sk(sk); + struct sk_buff *skb; + int used, err; + + mutex_lock(&u->iolock); + skb = skb_recv_datagram(sk, 0, 1, &err); + if (!skb) { + mutex_unlock(&u->iolock); + return err; + } + + used = recv_actor(desc, skb, 0, skb->len); + if (used <= 0) { + if (!copied) + copied = used; + mutex_unlock(&u->iolock); + break; + } else if (used <= skb->len) { + copied += used; + } + mutex_unlock(&u->iolock); + + if (!desc->count) + break; + } + + return copied; +} + /* * Sleep until more data has arrived. But check for races.. */