From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B21C8651 for ; Fri, 20 Oct 2023 01:18:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fBqNsF10" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFFCDC433C8; Fri, 20 Oct 2023 01:18:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697764739; bh=f95JIzztzdYYksSOam+CAsXzVDRhrcugWJ0tZQSRL6c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fBqNsF10F2KMzEu6xA8EiCeKmJJX/iikt4ySP3l+KmPRUYlY33VY7gtXKxEXb5bwz 3R+J0OwP1jyYzxHme4S+SxHNTbAE2nydyfwnmqdIrGlJykNMDoKpX1NeRLZCSsTrV1 jYITTSGqt3Co+z+Q3GHJemrrEnqE+uFC3gmKopZSpKVJfiZVQ4jXEOFZD6hukmRqn9 vhQ4PyDANCu/Sx4LEBeCbVm/FZwaFqHxyotWHlAw34iBmYA9W7O4IeRCr6liqXrHXC NII1tCWma88IwOHKc8XHONNt3rM+LJqaFOlyqHgEHI/BmVNnoEgfYu2ecnAJQYuFPs KNhv0wLmk5FGA== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, johannes.berg@intel.com, mpe@ellerman.id.au, j@w1.fi, jiri@resnulli.us Subject: [PATCH net-next 2/6] net: make dev_alloc_name() call dev_prep_valid_name() Date: Thu, 19 Oct 2023 18:18:52 -0700 Message-ID: <20231020011856.3244410-3-kuba@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231020011856.3244410-1-kuba@kernel.org> References: <20231020011856.3244410-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit __dev_alloc_name() handles both the sprintf and non-sprintf target names. This complicates the code. dev_prep_valid_name() already handles the non-sprintf case, before calling __dev_alloc_name(), make the only other caller also go thru dev_prep_valid_name(). This way we can drop the non-sprintf handling in __dev_alloc_name() in one of the next changes. commit 55a5ec9b7710 ("Revert "net: core: dev_get_valid_name is now the same as dev_alloc_name_ns"") and commit 029b6d140550 ("Revert "net: core: maybe return -EEXIST in __dev_alloc_name"") tell us that we can't start returning -EEXIST from dev_alloc_name() on name duplicates. Bite the bullet and pass the expected errno to dev_prep_valid_name(). dev_prep_valid_name() must now propagate out the allocated id for printf names. Signed-off-by: Jakub Kicinski --- net/core/dev.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 874c7daa81f5..004e9f26b160 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1137,19 +1137,18 @@ static int __dev_alloc_name(struct net *net, const char *name, char *res) return -ENFILE; } +/* Returns negative errno or allocated unit id (see __dev_alloc_name()) */ static int dev_prep_valid_name(struct net *net, struct net_device *dev, - const char *want_name, char *out_name) + const char *want_name, char *out_name, + int dup_errno) { - int ret; - if (!dev_valid_name(want_name)) return -EINVAL; if (strchr(want_name, '%')) { - ret = __dev_alloc_name(net, want_name, out_name); - return ret < 0 ? ret : 0; + return __dev_alloc_name(net, want_name, out_name); } else if (netdev_name_in_use(net, want_name)) { - return -EEXIST; + return -dup_errno; } else if (out_name != want_name) { strscpy(out_name, want_name, IFNAMSIZ); } @@ -1173,14 +1172,17 @@ static int dev_prep_valid_name(struct net *net, struct net_device *dev, int dev_alloc_name(struct net_device *dev, const char *name) { - return __dev_alloc_name(dev_net(dev), name, dev->name); + return dev_prep_valid_name(dev_net(dev), dev, name, dev->name, ENFILE); } EXPORT_SYMBOL(dev_alloc_name); static int dev_get_valid_name(struct net *net, struct net_device *dev, const char *name) { - return dev_prep_valid_name(net, dev, name, dev->name); + int ret; + + ret = dev_prep_valid_name(net, dev, name, dev->name, EEXIST); + return ret < 0 ? ret : 0; } /** @@ -11118,7 +11120,7 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net, /* We get here if we can't use the current device name */ if (!pat) goto out; - err = dev_prep_valid_name(net, dev, pat, new_name); + err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST); if (err < 0) goto out; } -- 2.41.0