llc_c_ev.c

linux 内核源代码

{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_0(pdu) &&
	       LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
}

int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_1(pdu) &&
	       LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
}

int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_0(pdu) &&
	       LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
}

int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_1(pdu) &&
	       LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
}

int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return llc_conn_space(sk, skb) &&
	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_0(pdu) &&
	       LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
}

int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	return llc_conn_space(sk, skb) &&
	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
	       LLC_S_PF_IS_1(pdu) &&
	       LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
}

int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);

	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
	       LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1;
}

int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{
	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);

	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
	       LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_UA ? 0 : 1;
}

int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
{
	u16 rc = 1;
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);

	if (LLC_PDU_IS_CMD(pdu)) {
		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
			if (LLC_I_PF_IS_1(pdu))
				rc = 0;
		} else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu))
			rc = 0;
	}
	return rc;
}

int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
{
	u16 rc = 1;
	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);

	if (LLC_PDU_IS_CMD(pdu)) {
		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
			rc = 0;
		else if (LLC_PDU_TYPE_IS_U(pdu))
			switch (LLC_U_PDU_CMD(pdu)) {
			case LLC_2_PDU_CMD_SABME:
			case LLC_2_PDU_CMD_DISC:
				rc = 0;
				break;
			}
	}
	return rc;
}

int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
{
	u16 rc = 1;
	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);

	if (LLC_PDU_IS_RSP(pdu)) {
		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
			rc = 0;
		else if (LLC_PDU_TYPE_IS_U(pdu))
			switch (LLC_U_PDU_RSP(pdu)) {
			case LLC_2_PDU_RSP_UA:
			case LLC_2_PDU_RSP_DM:
			case LLC_2_PDU_RSP_FRMR:
				rc = 0;
				break;
			}
	}

	return rc;
}

int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
					       struct sk_buff *skb)
{
	u16 rc = 1;
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
	const u8 vs = llc_sk(sk)->vS;
	const u8 nr = LLC_I_GET_NR(pdu);

	if (LLC_PDU_IS_CMD(pdu) &&
	    (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
	    nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
		dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
			__FUNCTION__, llc_sk(sk)->state, vs, nr);
		rc = 0;
	}
	return rc;
}

int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk,
					       struct sk_buff *skb)
{
	u16 rc = 1;
	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
	const u8 vs = llc_sk(sk)->vS;
	const u8 nr = LLC_I_GET_NR(pdu);

	if (LLC_PDU_IS_RSP(pdu) &&
	    (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
	    nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
		rc = 0;
		dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
			__FUNCTION__, llc_sk(sk)->state, vs, nr);
	}
	return rc;
}

int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb)
{
	return 0;
}

int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	return ev->type != LLC_CONN_EV_TYPE_P_TMR;
}

int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	return ev->type != LLC_CONN_EV_TYPE_ACK_TMR;
}

int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	return ev->type != LLC_CONN_EV_TYPE_REJ_TMR;
}

int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	return ev->type != LLC_CONN_EV_TYPE_BUSY_TMR;
}

int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb)
{
	return 1;
}

int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
{
	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
	       ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1;
}

/* Event qualifier functions
 *
 * these functions simply verify the value of a state flag associated with
 * the connection and return either a 0 for success or a non-zero value
 * for not-success; verify the event is the type we expect
 */
int llc_conn_ev_qlfy_data_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->data_flag != 1;
}

int llc_conn_ev_qlfy_data_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->data_flag;
}

int llc_conn_ev_qlfy_data_flag_eq_2(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->data_flag != 2;
}

int llc_conn_ev_qlfy_p_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->p_flag != 1;
}

/**
 *	conn_ev_qlfy_last_frame_eq_1 - checks if frame is last in tx window
 *	@sk: current connection structure.
 *	@skb: current event.
 *
 *	This function determines when frame which is sent, is last frame of
 *	transmit window, if it is then this function return zero else return
 *	one.  This function is used for sending last frame of transmit window
 *	as I-format command with p-bit set to one. Returns 0 if frame is last
 *	frame, 1 otherwise.
 */
int llc_conn_ev_qlfy_last_frame_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return !(skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k);
}

/**
 *	conn_ev_qlfy_last_frame_eq_0 - checks if frame isn't last in tx window
 *	@sk: current connection structure.
 *	@skb: current event.
 *
 *	This function determines when frame which is sent, isn't last frame of
 *	transmit window, if it isn't then this function return zero else return
 *	one. Returns 0 if frame isn't last frame, 1 otherwise.
 */
int llc_conn_ev_qlfy_last_frame_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k;
}

int llc_conn_ev_qlfy_p_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->p_flag;
}

int llc_conn_ev_qlfy_p_flag_eq_f(struct sock *sk, struct sk_buff *skb)
{
	u8 f_bit;

	llc_pdu_decode_pf_bit(skb, &f_bit);
	return llc_sk(sk)->p_flag == f_bit ? 0 : 1;
}

int llc_conn_ev_qlfy_remote_busy_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->remote_busy_flag;
}

int llc_conn_ev_qlfy_remote_busy_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return !llc_sk(sk)->remote_busy_flag;
}

int llc_conn_ev_qlfy_retry_cnt_lt_n2(struct sock *sk, struct sk_buff *skb)
{
	return !(llc_sk(sk)->retry_count < llc_sk(sk)->n2);
}

int llc_conn_ev_qlfy_retry_cnt_gte_n2(struct sock *sk, struct sk_buff *skb)
{
	return !(llc_sk(sk)->retry_count >= llc_sk(sk)->n2);
}

int llc_conn_ev_qlfy_s_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return !llc_sk(sk)->s_flag;
}

int llc_conn_ev_qlfy_s_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->s_flag;
}

int llc_conn_ev_qlfy_cause_flag_eq_1(struct sock *sk, struct sk_buff *skb)
{
	return !llc_sk(sk)->cause_flag;
}

int llc_conn_ev_qlfy_cause_flag_eq_0(struct sock *sk, struct sk_buff *skb)
{
	return llc_sk(sk)->cause_flag;
}

int llc_conn_ev_qlfy_set_status_conn(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_CONN;
	return 0;
}

int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_DISC;
	return 0;
}

int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_FAILED;
	return 0;
}

int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk,
					    struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_REMOTE_BUSY;
	return 0;
}

int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_REFUSE;
	return 0;
}

int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_CONFLICT;
	return 0;
}

int llc_conn_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb)
{
	struct llc_conn_state_ev *ev = llc_conn_ev(skb);

	ev->status = LLC_STATUS_RESET_DONE;
	return 0;
}