NF_HOOK_COND 285 include/linux/netfilter.h NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, NF_HOOK_COND 387 include/linux/netfilter.h NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,