From patchwork Tue Jun 13 10:14:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenz Bauer X-Patchwork-Id: 13278266 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EECBEC77B7A for ; Tue, 13 Jun 2023 10:15:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241106AbjFMKPG (ORCPT ); Tue, 13 Jun 2023 06:15:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240930AbjFMKPE (ORCPT ); Tue, 13 Jun 2023 06:15:04 -0400 Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6672D13A for ; Tue, 13 Jun 2023 03:15:02 -0700 (PDT) Received: by mail-wr1-x434.google.com with SMTP id ffacd0b85a97d-30e56fc9fd2so5111002f8f.0 for ; Tue, 13 Jun 2023 03:15:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent.com; s=google; t=1686651301; x=1689243301; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=72bcXZ+J6bNWWGqskqAX/uK8x0vlcNvpBj1vGVpBWRk=; b=c5uzEOJd5Q25WT9kSnvSeOMmE49QWmK3kgo7GNYndpP9Ta0GdnL6Z6cNiM+yrPbtQN pAIrsQhGIqaBJDxAxA5OjUzKq2RkeqIATkw2ixir3BvqDmgAIURnEF5egFs1uc3hhUXf phrc+DShXzZYll8zGFXC9W44aIm/JjqwgqOhFYBCVMMmyXPd9M6q2vWlUXVaGYMeHv5p 19jDzi3vToRiMlBiNgPxBVfOsNdd7iyLF7CqdeXezxP+1cwujDHs/KcBgyCdtQr+aBdt 2zM7L1yp5FlesbzZFlrPo9F5Y7KR+30khTKiDZTIi19OoZ5s97rIb9NXvnfJEnvzV1Vc +jLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686651301; x=1689243301; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=72bcXZ+J6bNWWGqskqAX/uK8x0vlcNvpBj1vGVpBWRk=; b=Hn8Y1TJ3JLnCvbHm6S9O0xEXya75zrylmM69BxMkBu4gM49uAH4AZ8egYg9w2GOXA9 vyXaOPrzlHIzg+6uTYVvYQztEDNGWBkRaCPVVfGdJvqvUIxu6CVrMLlvtbmQwXsHYtt7 CQsw42lOui2Kb0uTWaUJJC6rwQv/vNgL+XDb8P7c+USdfzVNwU6qTV1h1t5WxnpXpEwk HzPjhiVT8dJnwbyLb5GwUK9FpiGwZyY4/jqr3d62AkPOK0ZgEmf34WKtocy+3JuCm6R8 6Nbce26ZBicHBDJQ+J00c+6PbnlhJeDLBfDgYrXIGzqP+IAXKwZYcc0uiMWenlnhv6ba jIYQ== X-Gm-Message-State: AC+VfDy72/iZlInx46PVS16/iNJWxUI0rAcsfk1e1wMlPTPkW9S2Yw1p LnTE/C3YoC9fUjqLKbo1fEhAEw== X-Google-Smtp-Source: ACHHUZ7Oc83cRk7wLYXsUJMMFHonVPheudevi9JGLAn9ib4hlMOEsCz9G9FOAzY05GDnH95IzZchVQ== X-Received: by 2002:a5d:4b84:0:b0:30e:5578:280c with SMTP id b4-20020a5d4b84000000b0030e5578280cmr8010143wrt.67.1686651300905; Tue, 13 Jun 2023 03:15:00 -0700 (PDT) Received: from [192.168.133.193] ([5.148.46.226]) by smtp.gmail.com with ESMTPSA id k15-20020a5d6e8f000000b0030e6096afb6sm15075020wrz.12.2023.06.13.03.15.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jun 2023 03:15:00 -0700 (PDT) From: Lorenz Bauer Date: Tue, 13 Jun 2023 11:14:57 +0100 Subject: [PATCH bpf-next v2 2/6] net: document inet[6]_lookup_reuseport sk_state requirements MIME-Version: 1.0 Message-Id: <20230613-so-reuseport-v2-2-b7c69a342613@isovalent.com> References: <20230613-so-reuseport-v2-0-b7c69a342613@isovalent.com> In-Reply-To: <20230613-so-reuseport-v2-0-b7c69a342613@isovalent.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , David Ahern , Willem de Bruijn , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Joe Stringer , Mykola Lysenko , Shuah Khan , Kuniyuki Iwashima Cc: Hemanth Malla , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Lorenz Bauer X-Mailer: b4 0.12.2 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The current implementation was extracted from inet[6]_lhash2_lookup in commit 80b373f74f9e ("inet: Extract helper for selecting socket from reuseport group") and commit 5df6531292b5 ("inet6: Extract helper for selecting socket from reuseport group"). In the original context, sk is always in TCP_LISTEN state and so did not have a separate check. Add documentation that specifies which sk_state are valid to pass to the function. Signed-off-by: Lorenz Bauer --- net/ipv4/inet_hashtables.c | 14 ++++++++++++++ net/ipv6/inet6_hashtables.c | 14 ++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 920131e4a65d..91f9210d4e83 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -332,6 +332,20 @@ static inline int compute_score(struct sock *sk, struct net *net, return score; } +/** + * inet_lookup_reuseport() - execute reuseport logic on AF_INET socket if necessary. + * @net: network namespace. + * @sk: AF_INET socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP. + * @skb: context for a potential SK_REUSEPORT program. + * @doff: header offset. + * @saddr: source address. + * @sport: source port. + * @daddr: destination address. + * @hnum: destination port in host byte order. + * + * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to + * the selected sock or an error. + */ struct sock *inet_lookup_reuseport(struct net *net, struct sock *sk, struct sk_buff *skb, int doff, __be32 saddr, __be16 sport, diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c index b7c56867314e..208998694ae3 100644 --- a/net/ipv6/inet6_hashtables.c +++ b/net/ipv6/inet6_hashtables.c @@ -111,6 +111,20 @@ static inline int compute_score(struct sock *sk, struct net *net, return score; } +/** + * inet6_lookup_reuseport() - execute reuseport logic on AF_INET6 socket if necessary. + * @net: network namespace. + * @sk: AF_INET6 socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP. + * @skb: context for a potential SK_REUSEPORT program. + * @doff: header offset. + * @saddr: source address. + * @sport: source port. + * @daddr: destination address. + * @hnum: destination port in host byte order. + * + * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to + * the selected sock or an error. + */ struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk, struct sk_buff *skb, int doff, const struct in6_addr *saddr,