taglinefilesource code
PF_INET109net/ipv4/ip_forward.cfw_res=call_fw_firewall(PF_INET, skb, skb->h.iph);
PF_INET1712net/ipv4/ip_fw.cPF_INET,
PF_INET1730net/ipv4/ip_fw.cif(register_firewall(PF_INET,&ipfw_ops)<0)
PF_INET278net/ipv4/ip_input.cif ((err=call_in_firewall(PF_INET, skb, iph))<FW_ACCEPT)
PF_INET366net/ipv4/ip_output.cif(call_out_firewall(PF_INET, skb, iph) < FW_ACCEPT)
PF_INET707net/ipv4/ip_output.cif(call_out_firewall(PF_INET, skb, iph)< FW_ACCEPT)
PF_INET911net/ipv4/ip_output.cif(!offset && call_out_firewall(PF_INET, skb, iph) < FW_ACCEPT)
PF_INET88net/ipv4/ipip.cif((err=call_in_firewall(PF_INET, skb, skb->ip_hdr))<FW_ACCEPT)