From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f179.google.com (mail-dy1-f179.google.com [74.125.82.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8D1427A927 for ; Wed, 25 Feb 2026 21:11:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772053883; cv=none; b=aFn5qZ/XttOSf4l0l+7vnUj09jEkOY0F5g9dfEmeOmcSQy+NwKCQCD+PQ9L/EE5LTNr5fY8Ojs1PR29Nx6c8EKu227MvbS2qAJm4EVtuFJZphmgSM5gzIOfrtqT6+wPZa97DBFwMYp+WRp4pmdJLAhrNXAzTacROVXjfIEr2oUE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772053883; c=relaxed/simple; bh=5yCS2ENyGebYWm4QR6WtcX3t1/V4wC3uAWzvrnxV/zc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=PnhHNbgbU8SzIzmyEKQtx3qf26LdaG+CsjOEC+FojyhC6K1E182KZbUHDlGErUqsIhhrQFeEjwT3eZKqBJhCbeBYGObehVu10z1VDZczGyjtpDkdNMfXuc30JtOa3AUYijw5IYnDtLOE40b3/G6X3MXeG9X6uk5JeeoCDOkeS68= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org; spf=pass smtp.mailfrom=networkplumber.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b=rt4qkx8h; arc=none smtp.client-ip=74.125.82.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=networkplumber.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20230601.gappssmtp.com header.i=@networkplumber-org.20230601.gappssmtp.com header.b="rt4qkx8h" Received: by mail-dy1-f179.google.com with SMTP id 5a478bee46e88-2b4520f6b32so143188eec.0 for ; Wed, 25 Feb 2026 13:11:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1772053881; x=1772658681; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=BNmTXCq2fTVbuDc5LvGj3dl9DEC7Kg0+x8gfaozwtk8=; b=rt4qkx8hRtX109bztZ9Ssuc4lE/dVSGg9I97Nh+l/XPVA/e7Rs8rDpGlaFU33ctTNo 1Rr0ExiCsN5AwrGaUlRklqVXGTFCV5XTUlBWsZJxW/KORCKj6no1Dk3yLuwxj10Pi9i/ dxbpNhTX7AVFQOkDA4DwZJY1bk3yIAjwYMlA0G4r+budYLgwfCPV/w7+9HwcZwRxmwGe k2eoCxFcOybpPkjDWvY0hbOpJrE6zCH5YXhYGrLSWT/u79fx+MT7rnL9XMERrO8Uvu5d aJdsnN9xM/vSbg4+TJADpi1gZYAOH8aQrJJM/m8h6XNMaNR/gF7l879uvJ8XwFuQZMMC kGsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772053881; x=1772658681; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=BNmTXCq2fTVbuDc5LvGj3dl9DEC7Kg0+x8gfaozwtk8=; b=fsNvZ9FU4lsbDEoskpi4DC6mTsH4zDbpIp+mKj0ieeOb8ojHgaW/UaL7hZgrBcsbYC A98lRx59YCSPOk7u+sodOPq2C39AaXDmQibFOwsYa7HvZlv+w+OJuSURgiR5iFL9k1vA xHrc/sACFc5yqHNNqcHSX8t5D4BqhN/l982GMtJcSI0/UqaHdoH+NRZD2wWTfxvyBN3F uGQfQJGA8SvPdYKMcuyBNu/yo4SsI9/elZHu3mT7YE1X1yVndBeuU8ZeZBmI/nyaleI6 0/hno2gDSCCtQ4XtgvRGL77nj5fMxNZJLw+Z+Ai9jAoedOpoh2HeWIX9bELkihpWxtiz 7n4g== X-Gm-Message-State: AOJu0Yyw8SU3PFa6L1h65FrdCF2X8vd1TmaVZpQcfinrRYJEYRyZAlId OhTGQYvojL4ILiX98IacOTe0ytJ/rHZcCJTneB3zEu4tiyOK9L3cbsBqNJWdUyjCcng9BIYpWWZ 9zsrbFfg= X-Gm-Gg: ATEYQzywipU6AIshj9RUfbhHh/tL1vXgblu/EVedkZL4uiTDRmEC5CVeZZdHeIAiluL pS1Gi+F3s/FTI8pBAc9u246jzLSaRxNGdFnb2L7pgP7yO4HxZrCK5yE17CXHYg035n/lOI7cF1M eFuBzHzDu+BQ6TUmIb8UFuLQ2LBL6+CIq4X2Knazl2C6YnNNFe1tyV7jbotE48kJ7X48tG1UnK2 P5sZ/fzmbFPun6kbNgZ3wO3o3/oBjfjapXlXnpzn6CSVJixnyqzrqxdLOYTCbV+azzPiqCTdto5 aAA5bmgkWezcRowoEaW3i5p3W3CO4P7Lf/ebgTLb6OzHOYM6c2UFkfw+caMMhWCG+4CVG7Vaipm lHLDQ87rdtOG/xB3tzugyBuINxqBQliJsT2b7mHjvs6C2LQKnhi/mqkJj4ED+sP46Nl48au3u2S oxa25t1H2UKd9cA29yNs88Mg3CJtWYV9l/LElyYCDlA/ADJupZrD0cYdNA49aObg== X-Received: by 2002:a05:693c:3002:b0:2ba:7b63:3f4f with SMTP id 5a478bee46e88-2bd7b9f1ddemr6683017eec.15.1772053880596; Wed, 25 Feb 2026 13:11:20 -0800 (PST) Received: from phoenix.lan (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2bdd1bce276sm171898eec.3.2026.02.25.13.11.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Feb 2026 13:11:20 -0800 (PST) From: Stephen Hemminger To: netdev@vger.kernel.org Cc: Stephen Hemminger Subject: [PATCH iproute2] ss: suppress netlink errors for unsupported protocols Date: Wed, 25 Feb 2026 13:10:25 -0800 Message-ID: <20260225211118.314008-1-stephen@networkplumber.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Error messages from sock_diag were only suppressed for extended protocols (> 255). Protocols like SCTP and DCCP also get EINVAL when their kernel modules are not loaded. Remove the conditional so all protocols suppress the error. This fixes the problem where: $ ss >/dev/null RTNETLINK answers: Invalid argument Signed-off-by: Stephen Hemminger --- misc/ss.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/misc/ss.c b/misc/ss.c index b3566f6b..7520003a 100644 --- a/misc/ss.c +++ b/misc/ss.c @@ -4120,13 +4120,13 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol) if (preferred_family == PF_INET6) family = PF_INET6; - /* extended protocol will use INET_DIAG_REQ_PROTOCOL, - * not supported by older kernels. On such kernel - * rtnl_dump will bail with rtnl_dump_error(). - * Suppress the error to avoid confusing the user + /* Suppress netlink errors. Older kernels do not support extended + * protocol requests using INET_DIAG_REQ_PROTOCOL, and some protocols + * may not be available in the running kernel (e.g. SCTP, DCCP). + * In both cases the kernel returns EINVAL which would cause + * rtnl_dump_error() to print a confusing "RTNETLINK answers" error. */ - if (protocol > 255) - rth.flags |= RTNL_HANDLE_F_SUPPRESS_NLERR; + rth.flags |= RTNL_HANDLE_F_SUPPRESS_NLERR; again: if ((err = sockdiag_send(family, rth.fd, protocol, f))) -- 2.51.0