From patchwork Wed Dec 18 13:08:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Liang X-Patchwork-Id: 13913685 Received: from mail-pj1-f54.google.com (mail-pj1-f54.google.com [209.85.216.54]) (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 5B62A1BEF80; Wed, 18 Dec 2024 13:09:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734527375; cv=none; b=jQFzbKvQ846P/KxqEUF2ZGbn9bC0gF6j/nF6DAqZEmXG16/sXVTT7KaKvFU/3vWvphAn5AXLMCnraLA0j7Uc7rKgXB6ZMomLJfEU5CxVg1056hSaF3BWd3/g6+URx0287S7EQ7if6KKSCZkppfwt/vdS9zz7bwqGwGg93gT+qGM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734527375; c=relaxed/simple; bh=Egm70QFHoPJQeKbJRemzVe3pKzsMp6lZRsVFCxj3tAY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=meiLWGGmjayuW3ELdlfVu0oBZIhD/o1wWchOI7TZX4fmXb9ce79I1MNUENv91FHloqPhec68mJXTu5olg1GS/Tm7lLIUtpVwXxavQ1Zok46dVTf5YtRvmtJF06pXDqsBr1z++66qKYi4lXZI0F16/UDQL6tyCUlAwKqr/8dswi0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=CjTLjUk0; arc=none smtp.client-ip=209.85.216.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="CjTLjUk0" Received: by mail-pj1-f54.google.com with SMTP id 98e67ed59e1d1-2ee67e9287fso5823381a91.0; Wed, 18 Dec 2024 05:09:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1734527373; x=1735132173; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=rqBeWHkwlk4K5tQfUbZueoC1cX5zOkU9dpB02VEAE+k=; b=CjTLjUk0q7PWkD2Wk8lKDND0twaWac56uX+h/mdW2vX6gLjm9Ime3iKmO47wb0slpi /T6eRuJVW1Crm3AdG3O0uz2M6vS5PazvOpVuC9n9alVaZwq6Qo+FkKtsHyEZnECHqJN1 WgKsRXCE5vjre0ZptRvxozWew6vP+J5nLeInYnOAL/mtibxtvEDQqaXB7FCfn04EL6i5 bSQs5rCEx+a8kjwxJS5DyqzkbcGrblbE/CkXjPOKq76DOnKpnXet+At6LipvyfeHZ2rU mJoQ+JuZVIlKZHxmWjrQYhkwzm0sNwcndWnj8mFWohaeVIdl3b6f07IrWY6J6+XT8k0O 7vlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734527373; x=1735132173; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=rqBeWHkwlk4K5tQfUbZueoC1cX5zOkU9dpB02VEAE+k=; b=l0Qt9Bu+2CaJZfiTxJewFk+cqjTO60upncl4rIGbemDCMkOEucRcK2i/UmE53Dpqnf eesQSzyRWFfWVWcNmrTPRdzUC0cqQL7AvFWk9uBECA5PiUw7kkYoY/ZZkYR5IXc66aB7 M233xz2POUmV1EflBvoZJ4XVga5Y0KICQJzRmBgrSU+p+wGLju9T9RIRK1cWANBFSjug X+J2DrAPbjLv/JoDq7l8TY4rweCNAD3VeghzcV5ESmIOKtu+ESyidFK7Rh34DZtvZo7/ ElNO3xmkfxu0FvNZ3lJZABkNPrN4IMTal4jwyotteRl43cjcOxZta7/dJJZ0eAqaa7vc egQA== X-Forwarded-Encrypted: i=1; AJvYcCUUOCpB2jrdhYLfKT8oFo7PpFUDU72FE/7E6czFa7oare13pkYm3s+RK73tLDeCrlA0DXn6bQzTnIFWfVVtyhM=@vger.kernel.org, AJvYcCVhpvXVl8FB1sFCDZeGr89w2V/5+TxmnPoiWSa4JzzeyqRGigAjH5LYBpPx4O79p8I4ri/JVSQtZwWxpdQTjvtg@vger.kernel.org, AJvYcCWhp+vx+xg5uRT6A1B7zfQ4MDZrlGNHjR1JVxCFEXdNStgQPFC8cuOMf1YtiWqjCaBc5FdFi8x++zMx@vger.kernel.org, AJvYcCWkOs1Gfg7fpRiO/BD841W574rhHDVMYUM0xS0wbVKveTxXwf9lkRLrIh7Bg/aJ1m/Q748=@vger.kernel.org, AJvYcCX1KRy+ndV/nz6TjsfI8NwLjCsRpuAO4cUyfFozh1Stg+UEqQlMPPflGEqsTKusulqa2jAMgMe6Ow2Ra8fx@vger.kernel.org, AJvYcCX9sCvSEILuTyszKqfyPCFS7gGOTLTCNQMCE/vY6oRImm3LtJ2vMgUAambcDjSauci/MNCvkCNVF2VA/w==@vger.kernel.org, AJvYcCXFMQ5F+c56nXRPKxc4VPMuKRPgvB47L8KeBwrJrB4a0rqO4mt5BjhUw0Jtf+IHKLafaI9bL9fhTheV@vger.kernel.org, AJvYcCXQsrj3IGCy00zdp9Z8yA3ron7wwbtKMzdyo+IG9KcELUZK4Te4HveMeyZCsFEEKs8fL5c0pLH75ztIBg==@vger.kernel.org X-Gm-Message-State: AOJu0YwdjcZ6ldzMuBq2PuQ8S6VZ1TIamNBlxlhFaSZbBWVEZYNzStkG LMkJCM5erKcBvF0SqJTDgmJJopdPNBfUgq3J6fBX9RHYfARaFCiRSy6JoOQaeSg= X-Gm-Gg: ASbGncuokuBb5mP9mPPtGw0diTcwKdbXEPhKg8Jh5uOERKM5+37Fjm5/ATj3ai0+4+4 tNQ/DCOXsGFdikCO+c2VWzEQt6CoOaesP0e9SI8mowt27d9IWn2tPI3FxKfUpTTCo9qQWfE8uCD fayTFA96f8xEH5SMdjfkPpdNQntWEH3dTgbmW7oGBjKvY7rLLQJl5yH7lmEprJ2dGOpIpA6SKre x0pl9EYfXc3ayyyz3bSg5Q5Z5q2ybcV4mPBF9kW7EWvXOU= X-Google-Smtp-Source: AGHT+IGwupxRC65MgCyutia2fH86BtEscvZ3hC19otgxhx9O+M/gNgTyzVuSwrO7sHgcHk/UbitTJA== X-Received: by 2002:a17:90b:5490:b0:2ee:48bf:7dc9 with SMTP id 98e67ed59e1d1-2f2e91f1112mr4682540a91.15.1734527372952; Wed, 18 Dec 2024 05:09:32 -0800 (PST) Received: from ws.. ([103.167.140.11]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-801d5c0f59asm7434754a12.67.2024.12.18.05.09.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2024 05:09:32 -0800 (PST) From: Xiao Liang To: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Kuniyuki Iwashima , Jakub Kicinski , Donald Hunter , Paolo Abeni Cc: "David S. Miller" , David Ahern , Eric Dumazet , Ido Schimmel , Andrew Lunn , Simon Horman , Shuah Khan , Jiri Pirko , Hangbin Liu , linux-rdma@vger.kernel.org, linux-can@vger.kernel.org, osmocom-net-gprs@lists.osmocom.org, bpf@vger.kernel.org, linux-ppp@vger.kernel.org, wireguard@lists.zx2c4.com, linux-wireless@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org, bridge@lists.linux.dev, linux-wpan@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v6 01/11] rtnetlink: Lookup device in target netns when creating link Date: Wed, 18 Dec 2024 21:08:59 +0800 Message-ID: <20241218130909.2173-2-shaw.leon@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241218130909.2173-1-shaw.leon@gmail.com> References: <20241218130909.2173-1-shaw.leon@gmail.com> Precedence: bulk X-Mailing-List: linux-wpan@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When creating link, lookup for existing device in target net namespace instead of current one. For example, two links created by: # ip link add dummy1 type dummy # ip link add netns ns1 dummy1 type dummy should have no conflict since they are in different namespaces. Signed-off-by: Xiao Liang --- net/core/rtnetlink.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index d9e363d9fa31..6a2fa030c8e0 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3851,20 +3851,26 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, { struct nlattr ** const tb = tbs->tb; struct net *net = sock_net(skb->sk); + struct net *device_net; struct net_device *dev; struct ifinfomsg *ifm; bool link_specified; + /* When creating, lookup for existing device in target net namespace */ + device_net = (nlh->nlmsg_flags & NLM_F_CREATE) && + (nlh->nlmsg_flags & NLM_F_EXCL) ? + tgt_net : net; + ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) { link_specified = true; - dev = __dev_get_by_index(net, ifm->ifi_index); + dev = __dev_get_by_index(device_net, ifm->ifi_index); } else if (ifm->ifi_index < 0) { NL_SET_ERR_MSG(extack, "ifindex can't be negative"); return -EINVAL; } else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) { link_specified = true; - dev = rtnl_dev_get(net, tb); + dev = rtnl_dev_get(device_net, tb); } else { link_specified = false; dev = NULL;