net/llc/llc_c_ev.c

Source file repositories/reference/linux-study-clean/net/llc/llc_c_ev.c

File Facts

System
Linux kernel
Corpus path
net/llc/llc_c_ev.c
Extension
.c
Size
21479 bytes
Lines
743
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

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",
			__func__, 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",
			__func__, llc_sk(sk)->state, vs, nr);
	}
	return rc;
}

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

Annotation

Implementation Notes