From mboxrd@z Thu Jan 1 00:00:00 1970 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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 815E0C48BE8 for ; Tue, 8 Jun 2021 19:33:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5965661001 for ; Tue, 8 Jun 2021 19:33:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239206AbhFHTfB (ORCPT ); Tue, 8 Jun 2021 15:35:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:40918 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238785AbhFHTUE (ORCPT ); Tue, 8 Jun 2021 15:20:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 21D5D61376; Tue, 8 Jun 2021 18:52:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623178345; bh=LQJUR8exshISsoUdCfe7FwT0pPIlkYfJO8Of8PzLbP4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HWdyCxynWNwRbOCv4gmrTSK6rtk6zxM7PMXc7N8ZMTk2OV+zx9E6PtTKrJq5zI5iv N01uKEoqM2tu3yLAChJ/QYZEJnAz5QCpJrnHyB7qHAVwBtRLgWB2ETUAdbMZVqE0ka vv4jm7+7tjA4n7wh7mvJ4V2u20vR6tfLgH/kaFuY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kasper Dupont , Thadeu Lima de Souza Cascardo , David Ahern , "David S. Miller" Subject: [PATCH 5.12 161/161] neighbour: allow NUD_NOARP entries to be forced GCed Date: Tue, 8 Jun 2021 20:28:11 +0200 Message-Id: <20210608175950.897071930@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175945.476074951@linuxfoundation.org> References: <20210608175945.476074951@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: David Ahern commit 7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f upstream. IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to fill up the neighbour table with enough entries that it will overflow for valid connections after that. This behaviour is more prevalent after commit 58956317c8de ("neighbor: Improve garbage collection") is applied, as it prevents removal from entries that are not NUD_FAILED, unless they are more than 5s old. Fixes: 58956317c8de (neighbor: Improve garbage collection) Reported-by: Kasper Dupont Signed-off-by: Thadeu Lima de Souza Cascardo Signed-off-by: David Ahern Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/core/neighbour.c | 1 + 1 file changed, 1 insertion(+) --- a/net/core/neighbour.c +++ b/net/core/neighbour.c @@ -238,6 +238,7 @@ static int neigh_forced_gc(struct neigh_ write_lock(&n->lock); if ((n->nud_state == NUD_FAILED) || + (n->nud_state == NUD_NOARP) || (tbl->is_multicast && tbl->is_multicast(n->primary_key)) || time_after(tref, n->updated))