From patchwork Mon Feb 27 19:51:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Xu X-Patchwork-Id: 13154160 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B10CEC7EE31 for ; Mon, 27 Feb 2023 19:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229708AbjB0Tvs (ORCPT ); Mon, 27 Feb 2023 14:51:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230351AbjB0Tvp (ORCPT ); Mon, 27 Feb 2023 14:51:45 -0500 Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 636CB2885C; Mon, 27 Feb 2023 11:51:40 -0800 (PST) Received: from compute2.internal (compute2.nyi.internal [10.202.2.46]) by mailout.west.internal (Postfix) with ESMTP id EE4323200094; Mon, 27 Feb 2023 14:51:38 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Mon, 27 Feb 2023 14:51:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dxuuu.xyz; h=cc :cc:content-transfer-encoding:date:date:from:from:in-reply-to :in-reply-to:message-id:mime-version:references:reply-to:sender :subject:subject:to:to; s=fm3; t=1677527498; x=1677613898; bh=gB Fdud0U0/x2N3GtbhHj2ToHCT4bsmtEl3upzYm7cgE=; b=RSZLtxSSnnabLFxjX9 7seENV5tpnz+8y96rl2FUH3cUjsZy+Uuy7BLFtImRR79+uEAn42MkwmEAWjA+0YW Wt4LeL3YULW45KoquooeoMpUAvJjiZ+DbVtxZfY2NokW5wxpeRtbd3k7fcI3zdTd 21CHy5j67/mH8BNTkm4enhqGwyS+E39M9v3e+V7EjSTKmkP3vI4NeM4kzc5G5RR9 /OXv+ATLO3YZio2Z/TySOLN4Yyrvi80KBsOnV0LQSZwp8Qb50RPOFq2f4ZeUcQld 2+ctfgodm0aF7EwtzioY1Gz5qBWw8FPbf44qIotLRWsG73mMJzK7Ablk+fhDfV6O 6ruw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; t=1677527498; x=1677613898; bh=gBFdud0U0/x2N 3GtbhHj2ToHCT4bsmtEl3upzYm7cgE=; b=sYDu8x/cAom0vpBgEy+QrnEmIaBP+ OevzV6NuOMdDz7RaRoMpATMXpnO/PQNDkUdae/IL8tO1AwUMBHTaHg3rRqka8CAo YTdwe5KYhcpGo6iO8xHyUiwBs30un5Ne5eAdMve5pZjGxQM19D7EHR0F00xF+/By wq//RtupuuoHwNrl+yNMu4ntYxYHD1LNc9GGYAzS6PtVqIDls5DaxJpR5Z17iB0d x+m6jtjyBBZpxRDit9fWcCn/T4NjDsocyKef9B0mAvprYdTuhtnNjRp1+14Dm11e tqsRYI6+REJF1QS5169WG8SDcW+pvvgvJkW5mpSeAtdJYBVYUKkO0TkiQ== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrudeltddguddviecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecufghrlhcuvffnffculdejtddmnecujfgurhephf fvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepffgrnhhivghlucgiuhcu oegugihusegugihuuhhurdighiiiqeenucggtffrrghtthgvrhhnpefgfefggeejhfduie ekvdeuteffleeifeeuvdfhheejleejjeekgfffgefhtddtteenucevlhhushhtvghrufhi iigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegugihusegugihuuhhurdighiii X-ME-Proxy: Feedback-ID: i6a694271:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 27 Feb 2023 14:51:37 -0500 (EST) From: Daniel Xu To: kuba@kernel.org, edumazet@google.com, willemdebruijn.kernel@gmail.com, davem@davemloft.net, pabeni@redhat.com, dsahern@kernel.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH bpf-next v2 1/8] ip: frags: Return actual error codes from ip_check_defrag() Date: Mon, 27 Feb 2023 12:51:03 -0700 Message-Id: X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Once we wrap ip_check_defrag() in a kfunc, it may be useful for progs to know the exact error condition ip_check_defrag() encountered. Signed-off-by: Daniel Xu --- drivers/net/macvlan.c | 2 +- net/ipv4/ip_fragment.c | 13 ++++++++----- net/packet/af_packet.c | 2 +- 3 files changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 99a971929c8e..b8310e13d7e1 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -456,7 +456,7 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb) unsigned int hash; skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN); - if (!skb) + if (IS_ERR(skb)) return RX_HANDLER_CONSUMED; *pskb = skb; eth = eth_hdr(skb); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 69c00ffdcf3e..959d2c4260ea 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -514,6 +514,7 @@ struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) struct iphdr iph; int netoff; u32 len; + int err; if (skb->protocol != htons(ETH_P_IP)) return skb; @@ -535,15 +536,17 @@ struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) if (skb) { if (!pskb_may_pull(skb, netoff + iph.ihl * 4)) { kfree_skb(skb); - return NULL; + return ERR_PTR(-ENOMEM); } - if (pskb_trim_rcsum(skb, netoff + len)) { + err = pskb_trim_rcsum(skb, netoff + len); + if (err) { kfree_skb(skb); - return NULL; + return ERR_PTR(err); } memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); - if (ip_defrag(net, skb, user)) - return NULL; + err = ip_defrag(net, skb, user); + if (err) + return ERR_PTR(err); skb_clear_hash(skb); } } diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index d4e76e2ae153..1ef94828c8da 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1470,7 +1470,7 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET); - if (!skb) + if (IS_ERR(skb)) return 0; } switch (f->type) {