LLCP_PDU_SYMM
skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
if (ptype != LLCP_PDU_SYMM)
case LLCP_PDU_SYMM: