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Diffstat (limited to 'net/llc/llc_s_ac.c')
| -rw-r--r-- | net/llc/llc_s_ac.c | 217 |
1 files changed, 217 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..df26557a0 --- /dev/null +++ b/net/llc/llc_s_ac.c @@ -0,0 +1,217 @@ +/* + * 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; + + if (skb->mac_len < ETH_HLEN) + return 1; + + 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; +} |