1 /* 2 * llc_s_ac.c - actions performed during sap state transition. 3 * 4 * Description : 5 * Functions in this module are implementation of sap component actions. 6 * Details of actions can be found in IEEE-802.2 standard document. 7 * All functions have one sap and one event as input argument. All of 8 * them return 0 On success and 1 otherwise. 9 * 10 * Copyright (c) 1997 by Procom Technology, Inc. 11 * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 12 * 13 * This program can be redistributed or modified under the terms of the 14 * GNU General Public License as published by the Free Software Foundation. 15 * This program is distributed without any warranty or implied warranty 16 * of merchantability or fitness for a particular purpose. 17 * 18 * See the GNU General Public License for more details. 19 */ 20 21 #include <linux/netdevice.h> 22 #include <net/llc.h> 23 #include <net/llc_pdu.h> 24 #include <net/llc_s_ac.h> 25 #include <net/llc_s_ev.h> 26 #include <net/llc_sap.h> 27 28 29 /** 30 * llc_sap_action_unit_data_ind - forward UI PDU to network layer 31 * @sap: SAP 32 * @skb: the event to forward 33 * 34 * Received a UI PDU from MAC layer; forward to network layer as a 35 * UNITDATA INDICATION; verify our event is the kind we expect 36 */ 37 int llc_sap_action_unitdata_ind(struct llc_sap *sap, struct sk_buff *skb) 38 { 39 llc_sap_rtn_pdu(sap, skb); 40 return 0; 41 } 42 43 /** 44 * llc_sap_action_send_ui - sends UI PDU resp to UNITDATA REQ to MAC layer 45 * @sap: SAP 46 * @skb: the event to send 47 * 48 * Sends a UI PDU to the MAC layer in response to a UNITDATA REQUEST 49 * primitive from the network layer. Verifies event is a primitive type of 50 * event. Verify the primitive is a UNITDATA REQUEST. 51 */ 52 int llc_sap_action_send_ui(struct llc_sap *sap, struct sk_buff *skb) 53 { 54 struct llc_sap_state_ev *ev = llc_sap_ev(skb); 55 int rc; 56 57 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap, 58 ev->daddr.lsap, LLC_PDU_CMD); 59 llc_pdu_init_as_ui_cmd(skb); 60 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac); 61 if (likely(!rc)) 62 rc = dev_queue_xmit(skb); 63 return rc; 64 } 65 66 /** 67 * llc_sap_action_send_xid_c - send XID PDU as response to XID REQ 68 * @sap: SAP 69 * @skb: the event to send 70 * 71 * Send a XID command PDU to MAC layer in response to a XID REQUEST 72 * primitive from the network layer. Verify event is a primitive type 73 * event. Verify the primitive is a XID REQUEST. 74 */ 75 int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb) 76 { 77 struct llc_sap_state_ev *ev = llc_sap_ev(skb); 78 int rc; 79 80 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap, 81 ev->daddr.lsap, LLC_PDU_CMD); 82 llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0); 83 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac); 84 if (likely(!rc)) 85 rc = dev_queue_xmit(skb); 86 return rc; 87 } 88 89 /** 90 * llc_sap_action_send_xid_r - send XID PDU resp to MAC for received XID 91 * @sap: SAP 92 * @skb: the event to send 93 * 94 * Send XID response PDU to MAC in response to an earlier received XID 95 * command PDU. Verify event is a PDU type event 96 */ 97 int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb) 98 { 99 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap; 100 int rc = 1; 101 struct sk_buff *nskb; 102 103 llc_pdu_decode_sa(skb, mac_da); 104 llc_pdu_decode_da(skb, mac_sa); 105 llc_pdu_decode_ssap(skb, &dsap); 106 nskb = llc_alloc_frame(NULL, skb->dev); 107 if (!nskb) 108 goto out; 109 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap, 110 LLC_PDU_RSP); 111 llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0); 112 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da); 113 if (likely(!rc)) 114 rc = dev_queue_xmit(nskb); 115 out: 116 return rc; 117 } 118 119 /** 120 * llc_sap_action_send_test_c - send TEST PDU to MAC in resp to TEST REQ 121 * @sap: SAP 122 * @skb: the event to send 123 * 124 * Send a TEST command PDU to the MAC layer in response to a TEST REQUEST 125 * primitive from the network layer. Verify event is a primitive type 126 * event; verify the primitive is a TEST REQUEST. 127 */ 128 int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb) 129 { 130 struct llc_sap_state_ev *ev = llc_sap_ev(skb); 131 int rc; 132 133 llc_pdu_header_init(skb, LLC_PDU_TYPE_U, ev->saddr.lsap, 134 ev->daddr.lsap, LLC_PDU_CMD); 135 llc_pdu_init_as_test_cmd(skb); 136 rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac); 137 if (likely(!rc)) 138 rc = dev_queue_xmit(skb); 139 return rc; 140 } 141 142 int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb) 143 { 144 u8 mac_da[ETH_ALEN], mac_sa[ETH_ALEN], dsap; 145 struct sk_buff *nskb; 146 int rc = 1; 147 148 llc_pdu_decode_sa(skb, mac_da); 149 llc_pdu_decode_da(skb, mac_sa); 150 llc_pdu_decode_ssap(skb, &dsap); 151 nskb = llc_alloc_frame(NULL, skb->dev); 152 if (!nskb) 153 goto out; 154 llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap, 155 LLC_PDU_RSP); 156 llc_pdu_init_as_test_rsp(nskb, skb); 157 rc = llc_mac_hdr_init(nskb, mac_sa, mac_da); 158 if (likely(!rc)) 159 rc = dev_queue_xmit(nskb); 160 out: 161 return rc; 162 } 163 164 /** 165 * llc_sap_action_report_status - report data link status to layer mgmt 166 * @sap: SAP 167 * @skb: the event to send 168 * 169 * Report data link status to layer management. Verify our event is the 170 * kind we expect. 171 */ 172 int llc_sap_action_report_status(struct llc_sap *sap, struct sk_buff *skb) 173 { 174 return 0; 175 } 176 177 /** 178 * llc_sap_action_xid_ind - send XID PDU resp to net layer via XID IND 179 * @sap: SAP 180 * @skb: the event to send 181 * 182 * Send a XID response PDU to the network layer via a XID INDICATION 183 * primitive. 184 */ 185 int llc_sap_action_xid_ind(struct llc_sap *sap, struct sk_buff *skb) 186 { 187 llc_sap_rtn_pdu(sap, skb); 188 return 0; 189 } 190 191 /** 192 * llc_sap_action_test_ind - send TEST PDU to net layer via TEST IND 193 * @sap: SAP 194 * @skb: the event to send 195 * 196 * Send a TEST response PDU to the network layer via a TEST INDICATION 197 * primitive. Verify our event is a PDU type event. 198 */ 199 int llc_sap_action_test_ind(struct llc_sap *sap, struct sk_buff *skb) 200 { 201 llc_sap_rtn_pdu(sap, skb); 202 return 0; 203 } 204