From patchwork Fri Jan 6 10:37:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jakub Sitnicki X-Patchwork-Id: 13091252 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 75C69C5479D for ; Fri, 6 Jan 2023 10:37:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230465AbjAFKhx (ORCPT ); Fri, 6 Jan 2023 05:37:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229478AbjAFKho (ORCPT ); Fri, 6 Jan 2023 05:37:44 -0500 Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B99016C2A5 for ; Fri, 6 Jan 2023 02:37:42 -0800 (PST) Received: by mail-ej1-x632.google.com with SMTP id fc4so2536343ejc.12 for ; Fri, 06 Jan 2023 02:37:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=gQnlpKgwe0xqLhj+MTVc/9g2kyjsM2ur4M2Y+9pYfEk=; b=hUcb1qds4iVXpS5xpGp9+kqZtcGLgUKUXzxsCHoPp21+inyvuVIQW15dSwnHK0Qe2d vIon3IN688mxIuIM5NK1xu+ZwhMdJ+ER1/9UqlK0d0so6Wo/f6BSCKfmEx9rsgEUKgKP 3wcfthFgmwAxy8vM5O3hDpgkwBcrd3eHedmSo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=gQnlpKgwe0xqLhj+MTVc/9g2kyjsM2ur4M2Y+9pYfEk=; b=EGO0b35a0VDEnUYi7Qafje7DMapyoWuMJw3fyZD2o6eqo5g4SWwIS+wBvafpHcLlnK ux2OMuTKDHv9Lc4HMWWcElRINA0wugoRALJmC/h/7/rFPhFoAM2B38QOM//zOt8pagUG bLJwPjJwNxqTYld0Czs7P2Y/QsfvrTODifqFcJZEt+G4jaoMxD1bT10s0JRs1N/6a7QY R/E9IbHlisoF2co4/xtSbK3gOFQIT6xN7nqcLS0jEtLt7rP7PJDCVoMoGm3FwpA8udp7 BbE6dRfYlWGwmIgbTq0zKIo+ndy8oiwo8gYMi4q9Y7f+/p5kc+k1CicNPMeuvN4SLZut qpVA== X-Gm-Message-State: AFqh2kp5KD+hCUCPbTQGzbr579Zs7DcpBUdSlZ0DIytSLLvo8E0MuRZ/ MkXiH8shGWnoK3l6WvFjDrFdXrl3osoCAUca X-Google-Smtp-Source: AMrXdXvUweYjpe0RGwLD7nyR838+Uhz7gsLetOq47n7oc3atX0Z8DDV3DSZokLW6DblJ0gJRij9I3g== X-Received: by 2002:a17:906:9f07:b0:7c1:6f0a:a2cf with SMTP id fy7-20020a1709069f0700b007c16f0aa2cfmr48899470ejc.32.1673001460498; Fri, 06 Jan 2023 02:37:40 -0800 (PST) Received: from cloudflare.com (79.184.146.66.ipv4.supernova.orange.pl. [79.184.146.66]) by smtp.gmail.com with ESMTPSA id 17-20020a170906059100b007933047f923sm278807ejn.118.2023.01.06.02.37.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Jan 2023 02:37:39 -0800 (PST) From: Jakub Sitnicki To: netdev@vger.kernel.org, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: kernel-team@cloudflare.com Subject: [PATCH net-next 0/2] Add IP_LOCAL_PORT_RANGE socket option Date: Fri, 6 Jan 2023 11:37:36 +0100 Message-Id: <20221221-sockopt-port-range-v1-0-e2b094b60ffd@cloudflare.com> X-Mailer: git-send-email 2.38.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This patch set is a follow up to the "How to share IPv4 addresses by partitioning the port space" talk given at LPC 2022 [1]. Please see patch #1 for the motivation & the use case description. Patch #2 adds tests exercising the new option in various scenarios. If the changes were to be accepted, here is the proposed update to the ip(7) man-page: IP_LOCAL_PORT_RANGE (since Linux X.Y) Set or get the per-socket default local port range. This option can be used to clamp down the global local port range, defined by the ip_local_port_range /proc interface described below, for a socket. The option takes a uint32_t value with the high 16 bits set to the upper range bound, and the low 16 bits set to the lower range bound. Range bounds are inclusive. If the speci‐ fied high or low bound is outside of the global local port range, or is set to zero, the set bound has no effect. Changelog: --------- RFC -> v1 RFC: https://lore.kernel.org/netdev/20220912225308.93659-1-jakub@cloudflare.com/ * Allow either the high bound or the low bound, or both, to be zero * Add getsockopt support * Add selftests Links: ------ [1]: https://lpc.events/event/16/contributions/1349/ To: netdev@vger.kernel.org To: "David S. Miller" To: Eric Dumazet To: Jakub Kicinski To: Paolo Abeni Cc: kernel-team@cloudflare.com Signed-off-by: Jakub Sitnicki --- Jakub Sitnicki (2): inet: Add IP_LOCAL_PORT_RANGE socket option selftests/net: Cover the IP_LOCAL_PORT_RANGE socket option include/net/inet_sock.h | 4 + include/net/ip.h | 3 +- include/uapi/linux/in.h | 1 + net/ipv4/inet_connection_sock.c | 22 +- net/ipv4/inet_hashtables.c | 2 +- net/ipv4/ip_sockglue.c | 18 + net/ipv4/udp.c | 2 +- tools/testing/selftests/net/Makefile | 2 + tools/testing/selftests/net/ip_local_port_range.c | 439 +++++++++++++++++++++ tools/testing/selftests/net/ip_local_port_range.sh | 5 + 10 files changed, 493 insertions(+), 5 deletions(-) --- base-commit: 3d759e9e24c38758abc19a4f5e1872a6460d5745 change-id: 20221221-sockopt-port-range-e142de700f4d Best regards,