netfilter: conntrack: allow insertion clash of gre protocol
NVGRE tunnel is used in the VM-to-VM communications. The VM packets are encapsulated in NVGRE and sent from the host. For NVGRE there are two tuples(outer sip and outer dip) in the host conntrack item. Insertion clashes are more likely to happen if the concurrent connections are sent from the VM. Signed-off-by: Faicker Mo <faicker.mo@ucloud.cn> Signed-off-by: Florian Westphal <fw@strlen.de>
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@ -296,6 +296,7 @@ void nf_conntrack_gre_init_net(struct net *net)
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/* protocol helper struct */
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const struct nf_conntrack_l4proto nf_conntrack_l4proto_gre = {
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.l4proto = IPPROTO_GRE,
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.allow_clash = true,
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#ifdef CONFIG_NF_CONNTRACK_PROCFS
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.print_conntrack = gre_print_conntrack,
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#endif
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