From patchwork Tue Feb 16 11:38:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 383657 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UPPERCASE_50_75 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 E1F93C433E6 for ; Tue, 16 Feb 2021 11:42:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D48A64DF0 for ; Tue, 16 Feb 2021 11:42:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230255AbhBPLmM (ORCPT ); Tue, 16 Feb 2021 06:42:12 -0500 Received: from mail-40136.protonmail.ch ([185.70.40.136]:52532 "EHLO mail-40136.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230381AbhBPLjW (ORCPT ); Tue, 16 Feb 2021 06:39:22 -0500 Date: Tue, 16 Feb 2021 11:38:34 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1613475517; bh=jIXE5w2oQPgxeatOYIJ5XGHcdrWadlvRgtBHKR6uEoQ=; h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From; b=eCD3ZSnbkwKQyQq0up6qK7z7UaKEYi7BoHgnRwTAw4Vd97kq6d4nEDxuPHhDxpiDa 10DMZmFyys6Szx3vP18bi/1uz9BxalzlqlJ7or6ea2mNMK6L+wqKkx3eQb5e5P56+W MuT96ukeDQMfwZ7gsgoAU2BcPrkLh7q3j8iYLUuVvZVQJjb5zdohoNWjtvrSOXZqUs GaG03SKxC3DVXXCe15NMyLpZxOquah9zdLVG/kbpUZv4g3sGP3UIqzAg7tkijQL3J2 HhTcO0ZUnlhuYgCIQMuWTT6qu8x1/pErc0wa5/VGCW2aMslSR3Ts4BojA6yBNdXQ25 bjlchsfqBgbcg== To: Magnus Karlsson , =?utf-8?q?Bj=C3=B6rn_T?= =?utf-8?b?w7ZwZWw=?= From: Alexander Lobakin Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Jonathan Lemon , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Paolo Abeni , Eric Dumazet , Xuan Zhuo , Dust Li , Alexander Lobakin , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Reply-To: Alexander Lobakin Subject: [PATCH v4 bpf-next 2/6] netdevice: check for net_device::priv_flags bitfield overflow Message-ID: <20210216113740.62041-3-alobakin@pm.me> In-Reply-To: <20210216113740.62041-1-alobakin@pm.me> References: <20210216113740.62041-1-alobakin@pm.me> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org We almost ran out of unsigned int bitwidth. Define priv flags and check for potential overflow in the fashion of netdev_features_t. Defined this way, priv_flags can be easily expanded later with just changing its typedef. Signed-off-by: Alexander Lobakin --- include/linux/netdevice.h | 135 ++++++++++++++++++++------------------ 1 file changed, 72 insertions(+), 63 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index b895973390ee..fa4ab77ce81e 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1527,70 +1527,79 @@ struct net_device_ops { * @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running */ enum netdev_priv_flags { - IFF_802_1Q_VLAN = 1<<0, - IFF_EBRIDGE = 1<<1, - IFF_BONDING = 1<<2, - IFF_ISATAP = 1<<3, - IFF_WAN_HDLC = 1<<4, - IFF_XMIT_DST_RELEASE = 1<<5, - IFF_DONT_BRIDGE = 1<<6, - IFF_DISABLE_NETPOLL = 1<<7, - IFF_MACVLAN_PORT = 1<<8, - IFF_BRIDGE_PORT = 1<<9, - IFF_OVS_DATAPATH = 1<<10, - IFF_TX_SKB_SHARING = 1<<11, - IFF_UNICAST_FLT = 1<<12, - IFF_TEAM_PORT = 1<<13, - IFF_SUPP_NOFCS = 1<<14, - IFF_LIVE_ADDR_CHANGE = 1<<15, - IFF_MACVLAN = 1<<16, - IFF_XMIT_DST_RELEASE_PERM = 1<<17, - IFF_L3MDEV_MASTER = 1<<18, - IFF_NO_QUEUE = 1<<19, - IFF_OPENVSWITCH = 1<<20, - IFF_L3MDEV_SLAVE = 1<<21, - IFF_TEAM = 1<<22, - IFF_RXFH_CONFIGURED = 1<<23, - IFF_PHONY_HEADROOM = 1<<24, - IFF_MACSEC = 1<<25, - IFF_NO_RX_HANDLER = 1<<26, - IFF_FAILOVER = 1<<27, - IFF_FAILOVER_SLAVE = 1<<28, - IFF_L3MDEV_RX_HANDLER = 1<<29, - IFF_LIVE_RENAME_OK = 1<<30, + IFF_802_1Q_VLAN_BIT, + IFF_EBRIDGE_BIT, + IFF_BONDING_BIT, + IFF_ISATAP_BIT, + IFF_WAN_HDLC_BIT, + IFF_XMIT_DST_RELEASE_BIT, + IFF_DONT_BRIDGE_BIT, + IFF_DISABLE_NETPOLL_BIT, + IFF_MACVLAN_PORT_BIT, + IFF_BRIDGE_PORT_BIT, + IFF_OVS_DATAPATH_BIT, + IFF_TX_SKB_SHARING_BIT, + IFF_UNICAST_FLT_BIT, + IFF_TEAM_PORT_BIT, + IFF_SUPP_NOFCS_BIT, + IFF_LIVE_ADDR_CHANGE_BIT, + IFF_MACVLAN_BIT, + IFF_XMIT_DST_RELEASE_PERM_BIT, + IFF_L3MDEV_MASTER_BIT, + IFF_NO_QUEUE_BIT, + IFF_OPENVSWITCH_BIT, + IFF_L3MDEV_SLAVE_BIT, + IFF_TEAM_BIT, + IFF_RXFH_CONFIGURED_BIT, + IFF_PHONY_HEADROOM_BIT, + IFF_MACSEC_BIT, + IFF_NO_RX_HANDLER_BIT, + IFF_FAILOVER_BIT, + IFF_FAILOVER_SLAVE_BIT, + IFF_L3MDEV_RX_HANDLER_BIT, + IFF_LIVE_RENAME_OK_BIT, + + NETDEV_PRIV_FLAG_COUNT, }; -#define IFF_802_1Q_VLAN IFF_802_1Q_VLAN -#define IFF_EBRIDGE IFF_EBRIDGE -#define IFF_BONDING IFF_BONDING -#define IFF_ISATAP IFF_ISATAP -#define IFF_WAN_HDLC IFF_WAN_HDLC -#define IFF_XMIT_DST_RELEASE IFF_XMIT_DST_RELEASE -#define IFF_DONT_BRIDGE IFF_DONT_BRIDGE -#define IFF_DISABLE_NETPOLL IFF_DISABLE_NETPOLL -#define IFF_MACVLAN_PORT IFF_MACVLAN_PORT -#define IFF_BRIDGE_PORT IFF_BRIDGE_PORT -#define IFF_OVS_DATAPATH IFF_OVS_DATAPATH -#define IFF_TX_SKB_SHARING IFF_TX_SKB_SHARING -#define IFF_UNICAST_FLT IFF_UNICAST_FLT -#define IFF_TEAM_PORT IFF_TEAM_PORT -#define IFF_SUPP_NOFCS IFF_SUPP_NOFCS -#define IFF_LIVE_ADDR_CHANGE IFF_LIVE_ADDR_CHANGE -#define IFF_MACVLAN IFF_MACVLAN -#define IFF_XMIT_DST_RELEASE_PERM IFF_XMIT_DST_RELEASE_PERM -#define IFF_L3MDEV_MASTER IFF_L3MDEV_MASTER -#define IFF_NO_QUEUE IFF_NO_QUEUE -#define IFF_OPENVSWITCH IFF_OPENVSWITCH -#define IFF_L3MDEV_SLAVE IFF_L3MDEV_SLAVE -#define IFF_TEAM IFF_TEAM -#define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED -#define IFF_PHONY_HEADROOM IFF_PHONY_HEADROOM -#define IFF_MACSEC IFF_MACSEC -#define IFF_NO_RX_HANDLER IFF_NO_RX_HANDLER -#define IFF_FAILOVER IFF_FAILOVER -#define IFF_FAILOVER_SLAVE IFF_FAILOVER_SLAVE -#define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER -#define IFF_LIVE_RENAME_OK IFF_LIVE_RENAME_OK +typedef u32 netdev_priv_flags_t; +static_assert(sizeof(netdev_priv_flags_t) * BITS_PER_BYTE <= + NETDEV_PRIV_FLAG_COUNT); + +#define __IFF_BIT(bit) ((netdev_priv_flags_t)1 << (bit)) +#define __IFF(name) __IFF_BIT(IFF_##name##_BIT) + +#define IFF_802_1Q_VLAN __IFF(802_1Q_VLAN) +#define IFF_EBRIDGE __IFF(EBRIDGE) +#define IFF_BONDING __IFF(BONDING) +#define IFF_ISATAP __IFF(ISATAP) +#define IFF_WAN_HDLC __IFF(WAN_HDLC) +#define IFF_XMIT_DST_RELEASE __IFF(XMIT_DST_RELEASE) +#define IFF_DONT_BRIDGE __IFF(DONT_BRIDGE) +#define IFF_DISABLE_NETPOLL __IFF(DISABLE_NETPOLL) +#define IFF_MACVLAN_PORT __IFF(MACVLAN_PORT) +#define IFF_BRIDGE_PORT __IFF(BRIDGE_PORT) +#define IFF_OVS_DATAPATH __IFF(OVS_DATAPATH) +#define IFF_TX_SKB_SHARING __IFF(TX_SKB_SHARING) +#define IFF_UNICAST_FLT __IFF(UNICAST_FLT) +#define IFF_TEAM_PORT __IFF(TEAM_PORT) +#define IFF_SUPP_NOFCS __IFF(SUPP_NOFCS) +#define IFF_LIVE_ADDR_CHANGE __IFF(LIVE_ADDR_CHANGE) +#define IFF_MACVLAN __IFF(MACVLAN) +#define IFF_XMIT_DST_RELEASE_PERM __IFF(XMIT_DST_RELEASE_PERM) +#define IFF_L3MDEV_MASTER __IFF(L3MDEV_MASTER) +#define IFF_NO_QUEUE __IFF(NO_QUEUE) +#define IFF_OPENVSWITCH __IFF(OPENVSWITCH) +#define IFF_L3MDEV_SLAVE __IFF(L3MDEV_SLAVE) +#define IFF_TEAM __IFF(TEAM) +#define IFF_RXFH_CONFIGURED __IFF(RXFH_CONFIGURED) +#define IFF_PHONY_HEADROOM __IFF(PHONY_HEADROOM) +#define IFF_MACSEC __IFF(MACSEC) +#define IFF_NO_RX_HANDLER __IFF(NO_RX_HANDLER) +#define IFF_FAILOVER __IFF(FAILOVER) +#define IFF_FAILOVER_SLAVE __IFF(FAILOVER_SLAVE) +#define IFF_L3MDEV_RX_HANDLER __IFF(L3MDEV_RX_HANDLER) +#define IFF_LIVE_RENAME_OK __IFF(LIVE_RENAME_OK) /** * struct net_device - The DEVICE structure. @@ -1925,7 +1934,7 @@ struct net_device { const struct header_ops *header_ops; unsigned int flags; - unsigned int priv_flags; + netdev_priv_flags_t priv_flags; unsigned short gflags; unsigned short padded;