From patchwork Wed Nov 13 12:57:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Liang X-Patchwork-Id: 13873649 Received: from mail-pj1-f45.google.com (mail-pj1-f45.google.com [209.85.216.45]) (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 EC6F51FEFA0; Wed, 13 Nov 2024 12:58:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731502684; cv=none; b=K3Gu1JEj5dKaeTUkdHda/7tL8hEQoVqUKKLIdWzy7fNXCJ5UPgjIprTOGdtmr/iwZqa5czcMW1wmepdPi+KSkxKuEc9/ig21WnfsnGjmUTg7n0DWTH6FTFSBeVMBNY3tVhU8gsgmUPLcdNaV9AXjUMieO1OKfiOej1wkBM3cl7c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731502684; c=relaxed/simple; bh=LFiCqhXlvihNQqIohXypmeWbbfe7D5PEOM7sD6uUzcg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hw8wNHAf6N2gUL2JT+69gxYa+lwUk8wK6OVJswCe9XccVsL1EZo4vrI0l3uDVmpCRcJdRwnh5x/EM2jXI6D1BvmbPdmjJjocsOaLI+t2asEOCOdfEokWEjlfjtIwCwdKEpx+k5ZhA7Y8iT49ulN3KsqyN73EkmhZHB6wpcfCThY= 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=NeGm5nw1; arc=none smtp.client-ip=209.85.216.45 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="NeGm5nw1" Received: by mail-pj1-f45.google.com with SMTP id 98e67ed59e1d1-2e91403950dso5270253a91.3; Wed, 13 Nov 2024 04:58:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731502681; x=1732107481; 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=r30qTLZF8ANhBKyxqq0VyimbMaQgwK/VTM3BE1AEUlA=; b=NeGm5nw1k+oyDwu3kG5xHAo0ijebYcMlLKi7V8JFOGFrVl1Wy82WxKNNhxGtHNvKOj 53u4mMm5YIdyhkm4ZU3ioXlpN2IBw0oKs9/BMNQ3VzjSW1Ryu0lkbiQTdljGcaQcceAO iITpxmbiYZOMJ5yTW7NRp22qZGse7VYMMT69FTnOqsHcU9eLdVg9yqeNmJNPZj6ONnjO GqO8blpwMZMWRoCLAiAewb2gzXfx4UE6511kp0/IdRtQ3IfE0ew8dmML3el5SgfTi4xg tnT9zSNKCrnnJHDQU3Dxk3o2/0gCgr5nPxIWNe5buQoNjxaJXMa9agzlH1MAEWNW8i6v yoQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731502681; x=1732107481; 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=r30qTLZF8ANhBKyxqq0VyimbMaQgwK/VTM3BE1AEUlA=; b=hav+TrBn7f5RLeyoCSRN1t+LIGPzjBi0V1QDHFqKBYlwBQXLz59SqpdhWCqD7TX4th IeIINRvmzIJSHDKdKr/mXGyld5el9QXnKh4LtfRvkwDw4AgXFcAV8lcN7mqdUsNZssAF Mnv90Iwawoqw5inmYhtlvZL2Y5nZCKaWhiHoJttWQg34CeCz0VI9MHbcIJu7bpaEbHGi 5UKOno9fydpVhbMykhc3BI/gXd3i8TNEdv9YN5HkIgL0lhi8/rnKdWBAW1CqFeW6wRt1 ZxntDu5m/ByuKDHkrcMRE5X8ggKNZ0X1kY4KHXU+wgbR2yeydzoZz64Rpc58w2U/oZ1S q9tA== X-Forwarded-Encrypted: i=1; AJvYcCU5hT9VlNOnBVylY6GYMaxa3mWJaI2DDK0qSgUC67UMav2+csC/Xyy8YJM/e94xWygfQGQ=@vger.kernel.org, AJvYcCUQoZnR2PpcZnBDWVB48PZ+FA78ifHr8XdBp/2QZnkbNFABtSBzYshVDRyRj1b8Y77zdaLFXKmnXmneGkcjY8Y=@vger.kernel.org, AJvYcCUgNg4un5PYDW/RmM5IvVXSgNncLCg1BlgiDlAgbZW5cT6Pi7g8Mr3kYVnZQ7CXVjZlTgnkPzGdGCTf7w==@vger.kernel.org, AJvYcCUoANxcDY8gi4PJgWNbTCoADnV2HGg73mpaIR4qgTKO5OU1jk5gPZqpmlsKlcuQpzoV07hsZHELn73d@vger.kernel.org, AJvYcCVmpR9slt4MKng9Z2qUQ7eVv5+C+30Q5wlnQXsTawa543wRmJZzN2a6ul09SZWDMuYgSsX9ToBDs18F@vger.kernel.org, AJvYcCW7VY5H4+r/yF9VY2LINLyoGwCegZ/zUrLyuVYC/cIlv7JRDamVShxKtYtgEbe4zPdrnxIeu5S+k/slNA==@vger.kernel.org, AJvYcCWKwNl54bQTQYv++0sor8i1NSj2ENY/L1jmevy71BoWkPvTRkb69mmt/W0MwBgA+dizyJVjYRxLqjIhc6a9ks2a@vger.kernel.org, AJvYcCXlFbXo8tg9PYmIi2cgZLBG4eo/8w3CVib6aqcvFmthTtK7dyefQ00dckvM3XwXBgC4jVmE120fAf8fjF5H@vger.kernel.org X-Gm-Message-State: AOJu0Yxcs5pOD93QWAXA5w0qKZR16+dBzFOY8ncvcfn185Yv0mo4X1Cj M0QuxwhnGG7c0wpgQFgihuXO5GyUjx2z00qki5DcbeszrHkI4c71lqe3q+VX/Bc= X-Google-Smtp-Source: AGHT+IGHbWu6TztKh6tN8Sp6Cv2pF+0T1uVgEKu2tiVbycxbLB+U4mJhCEtmHq5ke3dUIYABcOdsZA== X-Received: by 2002:a17:90b:3907:b0:2c9:df1c:4a58 with SMTP id 98e67ed59e1d1-2e9b177fdcdmr24476632a91.23.1731502681391; Wed, 13 Nov 2024 04:58:01 -0800 (PST) Received: from nova-ws.. ([103.167.140.11]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e9f3f8ed0esm1398632a91.40.2024.11.13.04.57.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Nov 2024 04:58:00 -0800 (PST) From: Xiao Liang To: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Kuniyuki Iwashima , Jakub Kicinski , Donald Hunter Cc: "David S. Miller" , David Ahern , Eric Dumazet , Paolo Abeni , 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 v3 3/6] rtnetlink: Lookup device in target netns when creating link Date: Wed, 13 Nov 2024 20:57:12 +0800 Message-ID: <20241113125715.150201-4-shaw.leon@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241113125715.150201-1-shaw.leon@gmail.com> References: <20241113125715.150201-1-shaw.leon@gmail.com> Precedence: bulk X-Mailing-List: linux-rdma@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 327fa4957929..f573ace60234 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3846,20 +3846,26 @@ 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;