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lwtunnel: only keep the available bits when setting vxlan md->gbp

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As we can see from vxlan_build/parse_gbp_hdr(), when processing metadata
on vxlan rx/tx path, only dont_learn/policy_applied/policy_id fields can
be set to or parse from the packet for vxlan gbp option.

So do the mask when set it in lwtunnel, as it does in act_tunnel_key and
cls_flower.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2020-09-13 19:51:51 +08:00 committed by David S. Miller
parent 13e6ce98aa
commit 681d2cfb79
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/ip_tunnel_core.c
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@ -554,6 +554,7 @@ static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
md->gbp = nla_get_u32(attr);
md->gbp &= VXLAN_GBP_MASK;
info->key.tun_flags |= TUNNEL_VXLAN_OPT;
}