From patchwork Wed Mar 31 02:32:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cong Wang X-Patchwork-Id: 413424 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 D20CAC433F2 for ; Wed, 31 Mar 2021 02:33:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A33FB619DD for ; Wed, 31 Mar 2021 02:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233440AbhCaCdR (ORCPT ); Tue, 30 Mar 2021 22:33:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233403AbhCaCcv (ORCPT ); Tue, 30 Mar 2021 22:32:51 -0400 Received: from mail-ot1-x333.google.com (mail-ot1-x333.google.com [IPv6:2607:f8b0:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69CA2C061574; Tue, 30 Mar 2021 19:32:51 -0700 (PDT) Received: by mail-ot1-x333.google.com with SMTP id k14-20020a9d7dce0000b02901b866632f29so17606541otn.1; Tue, 30 Mar 2021 19:32:51 -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=8Wh0mzicKWG1utRZNIevS3oRZH+mXn5JWIkzgtioLig=; b=H0z0T66CbU6G1Qbor/GIxdSbaX9Bt+5B9VSgkpdr9sjv3u6Hc7T5Ib6yoBOfSKfVy2 HuJAfkl1P5I9z+b+NRkUIBcKzHmhLcOZ7lBXCGt1vhHb25wO81nhP+WstT97sd+y9cTt JTQfZsxfFHebRk9Y82JyafDLxPizdOIIJnc+6316v8MeN1R9Z5ntNYaaN9KwCGL9JCZr XdWGz6EIJv7liJEXdV5tbr2aKpZI3jVXByJnTKwjaVCpIQJJDStPoD14lZAa8zA7KVNJ phKCb72UeIjv+KaHl7Kv9oXoMXETvskOy+A1cDJMIxpnItGbipfuL+V2W3S+cceNklUl 7ksw== 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=8Wh0mzicKWG1utRZNIevS3oRZH+mXn5JWIkzgtioLig=; b=eIL1/FG7snACLfGxptEhYCz8XrHx9sYFwvPyYJhk6qIXyfWDZ2OYqGj8KEzn8UGQjp /QCilcBh+XRsz7ve8jFL1iZ5MmNqTi2rQh+cXafFHLIuFWPBySnfw9ATOO8QPr0s4TpJ LN+KodpTH81gnj3HUFR+Io6QewGYYkzDimrAzNKrizKC94fktmY6ndqncapHM6O8RvNi bKRWezHvPlVEaXosVhxiJrvbXRBfHlwj4xbNMfxEI7R9MbVtD0mFLgpPt1LKqIKkf8Qt WjVKu2kXglKnUmFl0BORHRoL0fm3orQa4ROnzhDBQKNw2yvWySH4j6SQHASsnu0Imwey /+Ew== X-Gm-Message-State: AOAM530wo7n/isf7fzbuV9UrZFIsSfRc+kgHtuHOcEyaGiKz+msx357k aBAp10p5frYZH5feeRsnmzq1UOu9D0663w== X-Google-Smtp-Source: ABdhPJzmIdkEvbn6PuxGYdemkk2WpgNtEt8XDmIMlmpgEwJzbLi5u6gL7yWmZQ/HbCnjft12zMJWKg== X-Received: by 2002:a9d:6296:: with SMTP id x22mr771545otk.196.1617157970720; Tue, 30 Mar 2021 19:32:50 -0700 (PDT) Received: from unknown.attlocal.net ([2600:1700:65a0:ab60:a099:767b:2b62:48df]) by smtp.gmail.com with ESMTPSA id 7sm188125ois.20.2021.03.30.19.32.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Mar 2021 19:32:50 -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 v8 03/16] net: introduce skb_send_sock() for sock_map Date: Tue, 30 Mar 2021 19:32:24 -0700 Message-Id: <20210331023237.41094-4-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210331023237.41094-1-xiyou.wangcong@gmail.com> References: <20210331023237.41094-1-xiyou.wangcong@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Cong Wang We only have skb_send_sock_locked() which requires callers to use lock_sock(). Introduce a variant skb_send_sock() which locks on its own, callers do not need to lock it any more. This will save us from adding a ->sendmsg_locked for each protocol. To reuse the code, pass function pointers to __skb_send_sock() and build skb_send_sock() and skb_send_sock_locked() on top. Cc: John Fastabend Cc: Daniel Borkmann Cc: Jakub Sitnicki Cc: Lorenz Bauer Signed-off-by: Cong Wang Reviewed-by: Jakub Sitnicki --- include/linux/skbuff.h | 1 + net/core/skbuff.c | 55 ++++++++++++++++++++++++++++++++++++------ 2 files changed, 49 insertions(+), 7 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c8def85fcc22..dbf820a50a39 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3626,6 +3626,7 @@ int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset, unsigned int flags); int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, int len); +int skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, int len); void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); unsigned int skb_zerocopy_headlen(const struct sk_buff *from); int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e8320b5d651a..3ad9e8425ab2 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2500,9 +2500,32 @@ int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset, } EXPORT_SYMBOL_GPL(skb_splice_bits); -/* Send skb data on a socket. Socket must be locked. */ -int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, - int len) +static int sendmsg_unlocked(struct sock *sk, struct msghdr *msg, + struct kvec *vec, size_t num, size_t size) +{ + struct socket *sock = sk->sk_socket; + + if (!sock) + return -EINVAL; + return kernel_sendmsg(sock, msg, vec, num, size); +} + +static int sendpage_unlocked(struct sock *sk, struct page *page, int offset, + size_t size, int flags) +{ + struct socket *sock = sk->sk_socket; + + if (!sock) + return -EINVAL; + return kernel_sendpage(sock, page, offset, size, flags); +} + +typedef int (*sendmsg_func)(struct sock *sk, struct msghdr *msg, + struct kvec *vec, size_t num, size_t size); +typedef int (*sendpage_func)(struct sock *sk, struct page *page, int offset, + size_t size, int flags); +static int __skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, + int len, sendmsg_func sendmsg, sendpage_func sendpage) { unsigned int orig_len = len; struct sk_buff *head = skb; @@ -2522,7 +2545,8 @@ int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, memset(&msg, 0, sizeof(msg)); msg.msg_flags = MSG_DONTWAIT; - ret = kernel_sendmsg_locked(sk, &msg, &kv, 1, slen); + ret = INDIRECT_CALL_2(sendmsg, kernel_sendmsg_locked, + sendmsg_unlocked, sk, &msg, &kv, 1, slen); if (ret <= 0) goto error; @@ -2553,9 +2577,11 @@ int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, slen = min_t(size_t, len, skb_frag_size(frag) - offset); while (slen) { - ret = kernel_sendpage_locked(sk, skb_frag_page(frag), - skb_frag_off(frag) + offset, - slen, MSG_DONTWAIT); + ret = INDIRECT_CALL_2(sendpage, kernel_sendpage_locked, + sendpage_unlocked, sk, + skb_frag_page(frag), + skb_frag_off(frag) + offset, + slen, MSG_DONTWAIT); if (ret <= 0) goto error; @@ -2587,8 +2613,23 @@ int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, error: return orig_len == len ? ret : orig_len - len; } + +/* Send skb data on a socket. Socket must be locked. */ +int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, + int len) +{ + return __skb_send_sock(sk, skb, offset, len, kernel_sendmsg_locked, + kernel_sendpage_locked); +} EXPORT_SYMBOL_GPL(skb_send_sock_locked); +/* Send skb data on a socket. Socket must be unlocked. */ +int skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, int len) +{ + return __skb_send_sock(sk, skb, offset, len, sendmsg_unlocked, + sendpage_unlocked); +} + /** * skb_store_bits - store bits from kernel buffer to skb * @skb: destination buffer