netdev - [PATCH v2 2/2] netfilter: nf_flow_table: reload ip{v6}h in nf_flow_tuple

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Message-Id: <1584410573-6812-2-git-send-email-yanhaishuang@cmss.chinamobile.com>
Date:   Tue, 17 Mar 2020 10:02:53 +0800
From:   Haishuang Yan <yanhaishuang@...s.chinamobile.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Haishuang Yan <yanhaishuang@...s.chinamobile.com>
Subject: [PATCH v2 2/2] netfilter: nf_flow_table: reload ip{v6}h in nf_flow_tuple_ip{v6}

Since pskb_may_pull may change skb->data, so we need to reload ip{v6}h at
the right place.

Fixes: a908fdec3dda ("netfilter: nf_flow_table: move ipv6 offload hook
code to nf_flow_table")
Fixes: 7d2086871762 ("netfilter: nf_flow_table: move ipv4 offload hook
code to nf_flow_table")
Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com>
---
v2: collapse the patches
---
 net/netfilter/nf_flow_table_ip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 942bda5..610c60a 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -190,6 +190,7 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
 	if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
 		return -1;
 
+	iph = ip_hdr(skb);
 	ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 
 	tuple->src_v4.s_addr	= iph->saddr;
@@ -452,6 +453,7 @@ static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
 	if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
 		return -1;
 
+	ip6h = ipv6_hdr(skb);
 	ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
 
 	tuple->src_v6		= ip6h->saddr;
-- 
1.8.3.1