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netfilter: flowtable: reload ip{v6}h in nf_flow_nat_ip{v6} 

Since nf_flow_snat_port and nf_flow_snat_ip{v6} call pskb_may_pull()
which may change skb->data, so we need to reload ip{v6}h at the right
place.

Fixes: a908fdec3d ("netfilter: nf_flow_table: move ipv6 offload hook code to nf_flow_table")
Fixes: 7d20868717 ("netfilter: nf_flow_table: move ipv4 offload hook code to nf_flow_table")
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Haishuang Yan 2020-03-17 10:02:52 +08:00 committed by Pablo Neira Ayuso
parent 3c025b6317
commit 61abaf02d2
1 changed files with 8 additions and 4 deletions
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12
net/netfilter/nf_flow_table_ip.c
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@ -146,11 +146,13 @@ static int nf_flow_nat_ip(const struct flow_offload *flow, struct sk_buff *skb,
if (test_bit(NF_FLOW_SNAT, &flow->flags) &&
(nf_flow_snat_port(flow, skb, thoff, iph->protocol, dir) < 0 ||
nf_flow_snat_ip(flow, skb, iph, thoff, dir) < 0))
nf_flow_snat_ip(flow, skb, ip_hdr(skb), thoff, dir) < 0))
return -1;
iph = ip_hdr(skb);
if (test_bit(NF_FLOW_DNAT, &flow->flags) &&
(nf_flow_dnat_port(flow, skb, thoff, iph->protocol, dir) < 0 ||
nf_flow_dnat_ip(flow, skb, iph, thoff, dir) < 0))
nf_flow_dnat_ip(flow, skb, ip_hdr(skb), thoff, dir) < 0))
return -1;
return 0;
@ -426,11 +428,13 @@ static int nf_flow_nat_ipv6(const struct flow_offload *flow,
if (test_bit(NF_FLOW_SNAT, &flow->flags) &&
(nf_flow_snat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 ||
nf_flow_snat_ipv6(flow, skb, ip6h, thoff, dir) < 0))
nf_flow_snat_ipv6(flow, skb, ipv6_hdr(skb), thoff, dir) < 0))
return -1;
ip6h = ipv6_hdr(skb);
if (test_bit(NF_FLOW_DNAT, &flow->flags) &&
(nf_flow_dnat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 ||
nf_flow_dnat_ipv6(flow, skb, ip6h, thoff, dir) < 0))
nf_flow_dnat_ipv6(flow, skb, ipv6_hdr(skb), thoff, dir) < 0))
return -1;
return 0;