From nobody Thu Nov 28 01:22:29 2024 Received: from mail-pl1-f194.google.com (mail-pl1-f194.google.com [209.85.214.194]) (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 B8D3518C00D; Mon, 7 Oct 2024 07:47:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728287267; cv=none; b=hw1UhO0es5WWIwr8QcBrOXWZ5oyVH9cMVYD28iLvy386xRTNlL00rXd/DYODlA6NlpTSycrtNx3u9tQGId4PTQQprd4yOEEVdSqr7Zr5rEnoG9onxFczckBweRCKFiASGQIIQ0VBsqAs7uIxi49t6zuMbHSgiy/HXUyCAihIBW8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728287267; c=relaxed/simple; bh=PcBRA/xqFnL+MQ07gHCcLehxHh4Rb4BzAYlM5Dxl7aU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZFUnH5VIl9OV6oRZq1IUsArAVzxEhSD16eu+Y+gVr/DVorddmBlSHbB5O3CijCBuEr943dJnmZSWDklgq8l8oiK2/OfmosgEgErxrudNiU6loGiNeJeNBIJhO8vjY3WdoGpDZjAx5j5l6tYqMEzxBWXVETS26U8s2YjTf8fjF7k= 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=Zoc67R8v; arc=none smtp.client-ip=209.85.214.194 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="Zoc67R8v" Received: by mail-pl1-f194.google.com with SMTP id d9443c01a7336-20b7463dd89so43441965ad.2; Mon, 07 Oct 2024 00:47:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728287265; x=1728892065; 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=hfQ47ggmFri0VQv7FK4Zlb4Ak1exGMOdHKZ5pgC6MzE=; b=Zoc67R8vUKLj6QiS7B3NCEYdVgOmDOmlUrOgPaLvZEbRA9tPfWTLwFq8Rzd7Iz5GU1 VQed9vzKFaBLAgXz1N2QLpnDRnI+sQsEUb1YcUMPhx8/ZZI7eTdJXdmG8Z0QMDfNj7kO p9phTUyhzNRS9jj95HCtaywqC0eP7fMgEuOYpDseCyMLUmH0wU/UuJmtaO0a8/WFq9hg 0L8wkQTTRStKEMLeZBIfqugXSYlIwzbnG+qKX0PQHzPQTQjEsm6DvrfWkUFhYBs3xYh/ Tl7c+OYUlqJLLxseh5mA7fHJn7soxyMf/kwjHxmhKzCKEFdXSktQ36gMI2BHStJjHh7H 4DyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728287265; x=1728892065; 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=hfQ47ggmFri0VQv7FK4Zlb4Ak1exGMOdHKZ5pgC6MzE=; b=CwX+Bj6r2nmeND+6lQWJe0oN0fUrSaK/V0YdQgn/qXIIFrxOm4LEgyakLi/0s8W+5P /JRf2oYAh1bTr2k/56t33YUxEibCuPJ9RIB6bDUD/6tidBBn73pIxci5mcllnviZZguM 2483o1euJzIxZQbgb/Jok/3Po0FQFpgTGICURdKiiZEhfJOYRn0aTtzgGjZ32RWe016A guKuNs7uMahuAKMIrOWsAf4if8t6DgxHFJGJjgFpcLd124vIu9QyTyVHGYJPbZdtqIp5 VVqhVWJFDVGEU/3/9XeZ8X11bAhpI5Lzlt331vLlqnsg7PXHwehJuAAY/p7bID8nsnHr FeMA== X-Forwarded-Encrypted: i=1; AJvYcCU79KYZxOC5N22cOrF+rP36wUVCga5vPyBZxe6fcUuY4OJ2r/XFJ9ABCAfJ25U3kd9hcPoWLtKzoBIIXc5a@vger.kernel.org, AJvYcCXFFqIxwwj7bQkTMUo572Ax4F8c89gCh7roRIHofkM71R0xANlWciz0gWC2+zx8vOC7zLQ=@vger.kernel.org, AJvYcCXWUHPwVuMRVyVGb7mx0BZUA+A3sZBsZJw/GWeogyRfTPUjfQFDhpFn2vI+3iT12aC528Z6YkFc@vger.kernel.org X-Gm-Message-State: AOJu0Yz8XK3huSLEy21YNLtiAusQnLwsrHKGG7eESv1M7B1QLOEOXBTk 0aVRjODeBRSx7TAdecOLBts4WbaVM/jTXzsDCd+K+7Lo8y/b+yJg X-Google-Smtp-Source: AGHT+IFKkPjceCn3dCoGeUfXxEm+Qd5/Ckkg2CB2n81ZyGDLB+2/5J4Ua1mC/Zq2eFgTrR9xxcG5rw== X-Received: by 2002:a17:902:ce88:b0:20b:6457:31db with SMTP id d9443c01a7336-20bfe044da1mr153723435ad.30.1728287265043; Mon, 07 Oct 2024 00:47:45 -0700 (PDT) Received: from localhost.localdomain ([43.129.25.208]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20c1393a15fsm34375395ad.121.2024.10.07.00.47.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2024 00:47:44 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: edumazet@google.com, kuba@kernel.org Cc: davem@davemloft.net, pabeni@redhat.com, dsahern@kernel.org, steffen.klassert@secunet.com, herbert@gondor.apana.org.au, dongml2@chinatelecom.cn, bigeasy@linutronix.de, toke@redhat.com, idosch@nvidia.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH net-next v2 4/7] net: ip: make ip_route_input_slow() return drop reasons Date: Mon, 7 Oct 2024 15:46:59 +0800 Message-Id: <20241007074702.249543-5-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241007074702.249543-1-dongml2@chinatelecom.cn> References: <20241007074702.249543-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In this commit, we make ip_route_input_slow() return skb drop reasons, and following new skb drop reasons are added: SKB_DROP_REASON_IP_INVALID_DEST The only caller of ip_route_input_slow() is ip_route_input_rcu(), and we adjust it by making it return -EINVAL on error. Signed-off-by: Menglong Dong --- include/net/dropreason-core.h | 6 +++++ net/ipv4/route.c | 51 +++++++++++++++++++++-------------- 2 files changed, 37 insertions(+), 20 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 32d9fcb54af9..e53f3d944e04 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -79,6 +79,7 @@ FN(IP_LOCAL_SOURCE) \ FN(IP_INVALID_SOURCE) \ FN(IP_LOCALNET) \ + FN(IP_INVALID_DEST) \ FN(PKT_TOO_BIG) \ FN(DUP_FRAG) \ FN(FRAG_REASM_TIMEOUT) \ @@ -378,6 +379,11 @@ enum skb_drop_reason { SKB_DROP_REASON_IP_INVALID_SOURCE, /** @SKB_DROP_REASON_IP_LOCALNET: source or dest ip is local net */ SKB_DROP_REASON_IP_LOCALNET, + /** + * @SKB_DROP_REASON_IP_INVALID_DEST: the dest ip is invalid: + * 1) dest ip is 0 + */ + SKB_DROP_REASON_IP_INVALID_DEST, /** * @SKB_DROP_REASON_PKT_TOO_BIG: packet size is too big (maybe exceed the * MTU) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index b41bb9be18e2..9b3f7bebcd86 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2207,10 +2207,12 @@ static struct net_device *ip_rt_get_dev(struct net = *net, * called with rcu_read_lock() */ =20 -static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 s= addr, - dscp_t dscp, struct net_device *dev, - struct fib_result *res) +static enum skb_drop_reason +ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, + dscp_t dscp, struct net_device *dev, + struct fib_result *res) { + enum skb_drop_reason reason =3D SKB_DROP_REASON_NOT_SPECIFIED; struct in_device *in_dev =3D __in_dev_get_rcu(dev); struct flow_keys *flkeys =3D NULL, _flkeys; struct net *net =3D dev_net(dev); @@ -2238,8 +2240,10 @@ static int ip_route_input_slow(struct sk_buff *skb, = __be32 daddr, __be32 saddr, fl4.flowi4_tun_key.tun_id =3D 0; skb_dst_drop(skb); =20 - if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) + if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) { + reason =3D SKB_DROP_REASON_IP_INVALID_SOURCE; goto martian_source; + } =20 res->fi =3D NULL; res->table =3D NULL; @@ -2249,21 +2253,29 @@ static int ip_route_input_slow(struct sk_buff *skb,= __be32 daddr, __be32 saddr, /* Accept zero addresses only to limited broadcast; * I even do not know to fix it or not. Waiting for complains :-) */ - if (ipv4_is_zeronet(saddr)) + if (ipv4_is_zeronet(saddr)) { + reason =3D SKB_DROP_REASON_IP_INVALID_SOURCE; goto martian_source; + } =20 - if (ipv4_is_zeronet(daddr)) + if (ipv4_is_zeronet(daddr)) { + reason =3D SKB_DROP_REASON_IP_INVALID_DEST; goto martian_destination; + } =20 /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), * and call it once if daddr or/and saddr are loopback addresses */ if (ipv4_is_loopback(daddr)) { - if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) + if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) { + reason =3D SKB_DROP_REASON_IP_LOCALNET; goto martian_destination; + } } else if (ipv4_is_loopback(saddr)) { - if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) + if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) { + reason =3D SKB_DROP_REASON_IP_LOCALNET; goto martian_source; + } } =20 /* @@ -2310,7 +2322,7 @@ static int ip_route_input_slow(struct sk_buff *skb, _= _be32 daddr, __be32 saddr, inet_dscp_to_dsfield(dscp), 0, dev, in_dev, &itag); if (err < 0) { - err =3D -EINVAL; + reason =3D -err; goto martian_source; } goto local_input; @@ -2326,18 +2338,21 @@ static int ip_route_input_slow(struct sk_buff *skb,= __be32 daddr, __be32 saddr, make_route: err =3D ip_mkroute_input(skb, res, in_dev, daddr, saddr, inet_dscp_to_dsfield(dscp), flkeys); -out: return err; + if (!err) + reason =3D SKB_NOT_DROPPED_YET; + +out: return reason; =20 brd_input: if (skb->protocol !=3D htons(ETH_P_IP)) - goto e_inval; + goto out; =20 if (!ipv4_is_zeronet(saddr)) { err =3D fib_validate_source(skb, saddr, 0, inet_dscp_to_dsfield(dscp), 0, dev, in_dev, &itag); if (err < 0) { - err =3D -EINVAL; + reason =3D -err; goto martian_source; } } @@ -2356,7 +2371,7 @@ out: return err; rth =3D rcu_dereference(nhc->nhc_rth_input); if (rt_cache_valid(rth)) { skb_dst_set_noref(skb, &rth->dst); - err =3D 0; + reason =3D SKB_NOT_DROPPED_YET; goto out; } } @@ -2393,7 +2408,7 @@ out: return err; rt_add_uncached_list(rth); } skb_dst_set(skb, &rth->dst); - err =3D 0; + reason =3D SKB_NOT_DROPPED_YET; goto out; =20 no_route: @@ -2414,12 +2429,8 @@ out: return err; &daddr, &saddr, dev->name); #endif =20 -e_inval: - err =3D -EINVAL; - goto out; - e_nobufs: - err =3D -ENOBUFS; + reason =3D SKB_DROP_REASON_NOMEM; goto out; =20 martian_source: @@ -2477,7 +2488,7 @@ static int ip_route_input_rcu(struct sk_buff *skb, __= be32 daddr, __be32 saddr, return reason ? -EINVAL : 0; } =20 - return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res); + return ip_route_input_slow(skb, daddr, saddr, dscp, dev, res) ? -EINVAL := 0; } =20 int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, --=20 2.39.5