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The nla_put_u16/nla_put_u32 makes sure that *attrlen is align. The call tree is that: nla_put_u16/nla_put_u32 -> nla_put attrlen = sizeof(u16) or sizeof(u32) -> __nla_put attrlen -> __nla_reserve attrlen -> skb_put(skb, nla_total_size(attrlen)) nla_total_size returns the total length of attribute including padding. Cc: Joe Stringer <joe@ovn.org> Cc: William Tu <u9012063@gmail.com> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>