/* * 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))		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, 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))		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);	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))		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;	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);	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;}