From patchwork Sat Jun 22 00:45:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?TWFoZXNoIEJhbmRld2FyICjgpK7gpLngpYfgpLYg4KSs4KSC4KSh4KWH4KS14KS+4KSwKQ==?= X-Patchwork-Id: 1120592 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.b="vEOAzobq"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45VxgG6rXcz9s4Y for ; Sat, 22 Jun 2019 10:45:46 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726423AbfFVApo (ORCPT ); Fri, 21 Jun 2019 20:45:44 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:38545 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726058AbfFVApo (ORCPT ); Fri, 21 Jun 2019 20:45:44 -0400 Received: by mail-vk1-f201.google.com with SMTP id u202so3100800vku.5 for ; Fri, 21 Jun 2019 17:45:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=mmP+fV5cy5/NoNcNYiiJaN4iM05M45CWe+WxnFdBezM=; b=vEOAzobq3y+X9MlSV5eP2oe7+N/g/Mm5mbcvStpzbrIpiAu1+QMLLrmBwChpivj9k3 C5IYWaoWIeye1hV6xBD3nB1eZeIh0f4Q3nq3m5pVFWn5yydfezPDohwVzwA0iKPUc9qX amYKb+ItYz7jdAcUB4mxW7oB34fN+NlHtoVLuOWH0JBT9cMHIJkuBk+PPb7yevfLDp7i kgeacW9SJsU6fQcxtxGeiSemr7Npv3uhnKk6bVgLp7EsExud4KEMEOOqEsWy+f7l46M7 E5vebr6d2NW//CZgLPAnTy+jBrUlAQXCE+4XS+VpLAV32Wy6wLmur8UvZWZhcXXDxtIM E/qw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=mmP+fV5cy5/NoNcNYiiJaN4iM05M45CWe+WxnFdBezM=; b=WC03sktIBJICuj8gZc0+zyJl2cqUC/qhPYuhANdMH86qqx1Qtugr1FbFS85VMetboj 3WdIr5wqQF1ze4dfTY1S2yVgyUI1wE9uECky+okguSjjZLBqkYSdS2+uRFUZUmPTIR2j 1vaKfbDOdvATPRaAhMEx/bvbNi1Dv9PWkxbqancBaMgP/RapgNq2+FMIHrJvXFV2eE6G jmyKH5KDyzOKAoJeJJFmoBLS8pw7QRE0knqSY8eXfVnDJInTWFuaBW+Lq6zYk6JeqeUz UO2G1wT3ATel0MbsBaiVPKvkC77FU6v/1F0VJkbi7sJ6+U7c5CfRKKQXdFu4rkph8kGU qFTQ== X-Gm-Message-State: APjAAAWsw26SaLGCy7j90dUt0CpBNxOyHoXUvI9OAPVh7EFjSocniwea Vf0xVbMTdcKVgurZwV/hXTpcw4Wx+bAu0whG9TWcnYXmglJraRdUhLs2/Tex4Sh4DHVCJ2EAmFT uq66Fw936PozpjlpHPSoFCRUqq+ubau3mOZL9E4qlK5GXHvdmorIB1C4hdFSHj2S5 X-Google-Smtp-Source: APXvYqyi+EaWy1QpXiWZ0XOHMgKgC0UDooCGjJLuZj7kFLt5A1gQcQz7cEZseuTzcuf6vfsJhGLn5gZggM9r X-Received: by 2002:ab0:30c7:: with SMTP id c7mr23676228uam.143.1561164338200; Fri, 21 Jun 2019 17:45:38 -0700 (PDT) Date: Fri, 21 Jun 2019 17:45:34 -0700 Message-Id: <20190622004534.91201-1-maheshb@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH next 2/3] blackhole_netdev: use blackhole_netdev to invalidate dst entries From: Mahesh Bandewar To: Netdev Cc: Eric Dumazet , David Miller , Michael Chan , Daniel Axtens , Mahesh Bandewar , Mahesh Bandewar Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Use blackhole_netdev instead of 'lo' device with lower MTU when marking dst "dead". Signed-off-by: Mahesh Bandewar --- net/core/dst.c | 2 +- net/ipv4/route.c | 3 +-- net/ipv6/route.c | 2 +- 3 files changed, 3 insertions(+), 4 deletions(-) diff --git a/net/core/dst.c b/net/core/dst.c index e46366228eaf..1325316d9eab 100644 --- a/net/core/dst.c +++ b/net/core/dst.c @@ -160,7 +160,7 @@ void dst_dev_put(struct dst_entry *dst) dst->ops->ifdown(dst, dev, true); dst->input = dst_discard; dst->output = dst_discard_out; - dst->dev = dev_net(dst->dev)->loopback_dev; + dst->dev = blackhole_netdev; dev_hold(dst->dev); dev_put(dev); } diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 66cbe8a7a168..049af0f88307 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1532,7 +1532,6 @@ static void ipv4_dst_destroy(struct dst_entry *dst) void rt_flush_dev(struct net_device *dev) { - struct net *net = dev_net(dev); struct rtable *rt; int cpu; @@ -1543,7 +1542,7 @@ void rt_flush_dev(struct net_device *dev) list_for_each_entry(rt, &ul->head, rt_uncached) { if (rt->dst.dev != dev) continue; - rt->dst.dev = net->loopback_dev; + rt->dst.dev = blackhole_netdev; dev_hold(rt->dst.dev); dev_put(dev); } diff --git a/net/ipv6/route.c b/net/ipv6/route.c index c4d285fe0adc..335bcf812b25 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -176,7 +176,7 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) } if (rt_dev == dev) { - rt->dst.dev = loopback_dev; + rt->dst.dev = blackhole_netdev; dev_hold(rt->dst.dev); dev_put(rt_dev); }