Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 214 insertions, 0 deletions

diff --git a/net/llc/llc_s_ac.c b/net/llc/llc_s_ac.c
new file mode 100644
index 000000000..9fa3342c7
--- /dev/null
+++ b/net/llc/llc_s_ac.c
@@ -0,0 +1,214 @@
+/*
+ * llc_s_ac.c - actions performed during sap state transition.
+ *
+ * Description :
+ *   Functions in this module are implementation of sap component actions.
+ *   Details of actions can be found in IEEE-802.2 standard document.
+ *   All functions have one sap and one event as input argument. All of
+ *   them return 0 On success and 1 otherwise.
+ *
+ * Copyright (c) 1997 by Procom Technology, Inc.
+ *		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * This program can be redistributed or modified under the terms of the
+ * GNU General Public License as published by the Free Software Foundation.
+ * This program is distributed without any warranty or implied warranty
+ * of merchantability or fitness for a particular purpose.
+ *
+ * See the GNU General Public License for more details.
+ */
+
+#include <linux/netdevice.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <net/llc_s_ac.h>
+#include <net/llc_s_ev.h>
+#include <net/llc_sap.h>
+
+
+/**
+ *	llc_sap_action_unit_data_ind - forward UI PDU to network layer
+ *	@sap: SAP
+ *	@skb: the event to forward
+ *
+ *	Received a UI PDU from MAC layer; forward to network layer as a
+ *	UNITDATA INDICATION; verify our event is the kind we expect
+ */
+int llc_sap_action_unitdata_ind(struct llc_sap *sap, struct sk_buff *skb)
+{
+	llc_sap_rtn_pdu(sap, skb);
+	return 0;
+}
+
+/**
+ *	llc_sap_action_send_ui - sends UI PDU resp to UNITDATA REQ to MAC layer
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Sends a UI PDU to the MAC layer in response to a UNITDATA REQUEST
+ *	primitive from the network layer. Verifies event is a primitive type of
+ *	event. Verify the primitive is a UNITDATA REQUEST.
+ */
+int llc_sap_action_send_ui(struct llc_sap *sap, struct sk_buff *skb)
+{
+	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+	int rc;
+
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
+			    ev->daddr.lsap, LLC_PDU_CMD);
+	llc_pdu_init_as_ui_cmd(skb);
+	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
+	if (likely(!rc)) {
+		skb_get(skb);
+		rc = dev_queue_xmit(skb);
+	}
+	return rc;
+}
+
+/**
+ *	llc_sap_action_send_xid_c - send XID PDU as response to XID REQ
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Send a XID command PDU to MAC layer in response to a XID REQUEST
+ *	primitive from the network layer. Verify event is a primitive type
+ *	event. Verify the primitive is a XID REQUEST.
+ */
+int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb)
+{
+	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+	int rc;
+
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U_XID, ev->saddr.lsap,
+			    ev->daddr.lsap, LLC_PDU_CMD);
+	llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0);
+	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
+	if (likely(!rc)) {
+		skb_get(skb);
+		rc = dev_queue_xmit(skb);
+	}
+	return rc;
+}
+
+/**
+ *	llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Send XID response PDU to MAC in response to an earlier received XID
+ *	command PDU. Verify event is a PDU type event
+ */
+int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
+{
+	u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
+	int rc = 1;
+	struct sk_buff *nskb;
+
+	llc_pdu_decode_sa(skb, mac_da);
+	llc_pdu_decode_da(skb, mac_sa);
+	llc_pdu_decode_ssap(skb, &dsap);
+	nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U,
+			       sizeof(struct llc_xid_info));
+	if (!nskb)
+		goto out;
+	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
+			    LLC_PDU_RSP);
+	llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0);
+	rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
+	if (likely(!rc))
+		rc = dev_queue_xmit(nskb);
+out:
+	return rc;
+}
+
+/**
+ *	llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Send a TEST command PDU to the MAC layer in response to a TEST REQUEST
+ *	primitive from the network layer. Verify event is a primitive type
+ *	event; verify the primitive is a TEST REQUEST.
+ */
+int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb)
+{
+	struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+	int rc;
+
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap,
+			    ev->daddr.lsap, LLC_PDU_CMD);
+	llc_pdu_init_as_test_cmd(skb);
+	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
+	if (likely(!rc)) {
+		skb_get(skb);
+		rc = dev_queue_xmit(skb);
+	}
+	return rc;
+}
+
+int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
+{
+	u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap;
+	struct sk_buff *nskb;
+	int rc = 1;
+	u32 data_size;
+
+	llc_pdu_decode_sa(skb, mac_da);
+	llc_pdu_decode_da(skb, mac_sa);
+	llc_pdu_decode_ssap(skb, &dsap);
+
+	/* The test request command is type U (llc_len = 3) */
+	data_size = ntohs(eth_hdr(skb)->h_proto) - 3;
+	nskb = llc_alloc_frame(NULL, skb->dev, LLC_PDU_TYPE_U, data_size);
+	if (!nskb)
+		goto out;
+	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
+			    LLC_PDU_RSP);
+	llc_pdu_init_as_test_rsp(nskb, skb);
+	rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
+	if (likely(!rc))
+		rc = dev_queue_xmit(nskb);
+out:
+	return rc;
+}
+
+/**
+ *	llc_sap_action_report_status - report data link status to layer mgmt
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Report data link status to layer management. Verify our event is the
+ *	kind we expect.
+ */
+int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb)
+{
+	return 0;
+}
+
+/**
+ *	llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Send a XID response PDU to the network layer via a XID INDICATION
+ *	primitive.
+ */
+int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb)
+{
+	llc_sap_rtn_pdu(sap, skb);
+	return 0;
+}
+
+/**
+ *	llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND
+ *	@sap: SAP
+ *	@skb: the event to send
+ *
+ *	Send a TEST response PDU to the network layer via a TEST INDICATION
+ *	primitive. Verify our event is a PDU type event.
+ */
+int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb)
+{
+	llc_sap_rtn_pdu(sap, skb);
+	return 0;
+}