struct nf_conntrack_l3proto;
extern struct nf_conntrack_l3proto *nf_ct_find_l3proto(u_int16_t pf);
/* Like above, but you already have conntrack read lock. */
struct nf_conntrack_l3proto;
extern struct nf_conntrack_l3proto *nf_ct_find_l3proto(u_int16_t pf);
/* Like above, but you already have conntrack read lock. */
struct nf_conntrack_l3proto *l3proto,
struct nf_conntrack_l4proto *proto);
struct nf_conntrack_l3proto *l3proto,
struct nf_conntrack_l4proto *proto);