SIP_HDR_FROM 204 net/ipv4/netfilter/nf_nat_sip.c if (!map_sip_addr(skb, dptr, datalen, SIP_HDR_FROM) || SIP_HDR_FROM 283 net/netfilter/nf_conntrack_sip.c [SIP_HDR_FROM] = SIP_HDR("From", "f", "sip:", skp_epaddr_len),