From patchwork Fri Jan 8 18:29:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarno Rajahalme X-Patchwork-Id: 565006 X-Patchwork-Delegate: pablo@netfilter.org Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3AE771402A1 for ; Sat, 9 Jan 2016 05:31:32 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932542AbcAHSbX (ORCPT ); Fri, 8 Jan 2016 13:31:23 -0500 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:53775 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756447AbcAHSal (ORCPT ); Fri, 8 Jan 2016 13:30:41 -0500 Received: from mfilter30-d.gandi.net (mfilter30-d.gandi.net [217.70.178.161]) by relay4-d.mail.gandi.net (Postfix) with ESMTP id CCBD4172097; Fri, 8 Jan 2016 19:30:40 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at mfilter30-d.gandi.net Received: from relay4-d.mail.gandi.net ([IPv6:::ffff:217.70.183.196]) by mfilter30-d.gandi.net (mfilter30-d.gandi.net [::ffff:10.0.15.180]) (amavisd-new, port 10024) with ESMTP id dYL9235SYcGZ; Fri, 8 Jan 2016 19:30:39 +0100 (CET) X-Originating-IP: 208.91.1.34 Received: from sc9-mailhost1.vmware.com (unknown [208.91.1.34]) (Authenticated sender: jarno@ovn.org) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 3600E1720B3; Fri, 8 Jan 2016 19:30:37 +0100 (CET) From: Jarno Rajahalme To: netdev@vger.kernel.org Cc: netfilter-devel@vger.kernel.org, dev@openvswitch.org, jarno@ovn.org Subject: [PATCH net-next v6 2/7] netfilter: Allow calling into nat helper without skb_dst. Date: Fri, 8 Jan 2016 10:29:55 -0800 Message-Id: <1452277800-46541-3-git-send-email-jarno@ovn.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1452277800-46541-1-git-send-email-jarno@ovn.org> References: <1452277800-46541-1-git-send-email-jarno@ovn.org> Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org NAT checksum recalculation code assumes existence of skb_dst, which becomes a problem for a later patch in the series ("openvswitch: Interface with NAT."). Simplify this by removing the check on skb_dst, as the checksum will be dealt with later in the stack. Suggested-by: Pravin Shelar Signed-off-by: Jarno Rajahalme --- net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 30 ++++++++---------------------- net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 30 ++++++++---------------------- 2 files changed, 16 insertions(+), 44 deletions(-) diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c index 61c7cc2..f8aad03 100644 --- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c @@ -127,29 +127,15 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb, u8 proto, void *data, __sum16 *check, int datalen, int oldlen) { - const struct iphdr *iph = ip_hdr(skb); - struct rtable *rt = skb_rtable(skb); - if (skb->ip_summed != CHECKSUM_PARTIAL) { - if (!(rt->rt_flags & RTCF_LOCAL) && - (!skb->dev || skb->dev->features & - (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM))) { - skb->ip_summed = CHECKSUM_PARTIAL; - skb->csum_start = skb_headroom(skb) + - skb_network_offset(skb) + - ip_hdrlen(skb); - skb->csum_offset = (void *)check - data; - *check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, - datalen, proto, 0); - } else { - *check = 0; - *check = csum_tcpudp_magic(iph->saddr, iph->daddr, - datalen, proto, - csum_partial(data, datalen, - 0)); - if (proto == IPPROTO_UDP && !*check) - *check = CSUM_MANGLED_0; - } + const struct iphdr *iph = ip_hdr(skb); + + skb->ip_summed = CHECKSUM_PARTIAL; + skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) + + ip_hdrlen(skb); + skb->csum_offset = (void *)check - data; + *check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, datalen, + proto, 0); } else inet_proto_csum_replace2(check, skb, htons(oldlen), htons(datalen), true); diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c index 6ce3099..e0be97e 100644 --- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c +++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c @@ -131,29 +131,15 @@ static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb, u8 proto, void *data, __sum16 *check, int datalen, int oldlen) { - const struct ipv6hdr *ipv6h = ipv6_hdr(skb); - struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); - if (skb->ip_summed != CHECKSUM_PARTIAL) { - if (!(rt->rt6i_flags & RTF_LOCAL) && - (!skb->dev || skb->dev->features & - (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))) { - skb->ip_summed = CHECKSUM_PARTIAL; - skb->csum_start = skb_headroom(skb) + - skb_network_offset(skb) + - (data - (void *)skb->data); - skb->csum_offset = (void *)check - data; - *check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, - datalen, proto, 0); - } else { - *check = 0; - *check = csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, - datalen, proto, - csum_partial(data, datalen, - 0)); - if (proto == IPPROTO_UDP && !*check) - *check = CSUM_MANGLED_0; - } + const struct ipv6hdr *ipv6h = ipv6_hdr(skb); + + skb->ip_summed = CHECKSUM_PARTIAL; + skb->csum_start = skb_headroom(skb) + skb_network_offset(skb) + + (data - (void *)skb->data); + skb->csum_offset = (void *)check - data; + *check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, + datalen, proto, 0); } else inet_proto_csum_replace2(check, skb, htons(oldlen), htons(datalen), true);