net/llc/llc_s_ev.c

0001 /*
0002  * llc_s_ev.c - Defines SAP component events
0003  *
0004  * The followed event functions are SAP component events which are described
0005  * in 802.2 LLC protocol standard document.
0006  *
0007  * Copyright (c) 1997 by Procom Technology, Inc.
0008  *       2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
0009  *
0010  * This program can be redistributed or modified under the terms of the
0011  * GNU General Public License as published by the Free Software Foundation.
0012  * This program is distributed without any warranty or implied warranty
0013  * of merchantability or fitness for a particular purpose.
0014  *
0015  * See the GNU General Public License for more details.
0016  */
0017 #include <linux/socket.h>
0018 #include <net/sock.h>
0019 #include <net/llc_if.h>
0020 #include <net/llc_s_ev.h>
0021 #include <net/llc_pdu.h>
0022
0023 int llc_sap_ev_activation_req(struct llc_sap *sap, struct sk_buff *skb)
0024 {
0025     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0026
0027     return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
0028            ev->prim_type == LLC_SAP_EV_ACTIVATION_REQ ? 0 : 1;
0029 }
0030
0031 int llc_sap_ev_rx_ui(struct llc_sap *sap, struct sk_buff *skb)
0032 {
0033     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0034     struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
0035
0036     return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
0037            LLC_PDU_TYPE_IS_U(pdu) &&
0038            LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_UI ? 0 : 1;
0039 }
0040
0041 int llc_sap_ev_unitdata_req(struct llc_sap *sap, struct sk_buff *skb)
0042 {
0043     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0044
0045     return ev->type == LLC_SAP_EV_TYPE_PRIM &&
0046            ev->prim == LLC_DATAUNIT_PRIM &&
0047            ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
0048
0049 }
0050
0051 int llc_sap_ev_xid_req(struct llc_sap *sap, struct sk_buff *skb)
0052 {
0053     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0054
0055     return ev->type == LLC_SAP_EV_TYPE_PRIM &&
0056            ev->prim == LLC_XID_PRIM &&
0057            ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
0058 }
0059
0060 int llc_sap_ev_rx_xid_c(struct llc_sap *sap, struct sk_buff *skb)
0061 {
0062     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0063     struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
0064
0065     return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
0066            LLC_PDU_TYPE_IS_U(pdu) &&
0067            LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
0068 }
0069
0070 int llc_sap_ev_rx_xid_r(struct llc_sap *sap, struct sk_buff *skb)
0071 {
0072     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0073     struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
0074
0075     return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
0076            LLC_PDU_TYPE_IS_U(pdu) &&
0077            LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
0078 }
0079
0080 int llc_sap_ev_test_req(struct llc_sap *sap, struct sk_buff *skb)
0081 {
0082     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0083
0084     return ev->type == LLC_SAP_EV_TYPE_PRIM &&
0085            ev->prim == LLC_TEST_PRIM &&
0086            ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
0087 }
0088
0089 int llc_sap_ev_rx_test_c(struct llc_sap *sap, struct sk_buff *skb)
0090 {
0091     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0092     struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
0093
0094     return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
0095            LLC_PDU_TYPE_IS_U(pdu) &&
0096            LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
0097 }
0098
0099 int llc_sap_ev_rx_test_r(struct llc_sap *sap, struct sk_buff *skb)
0100 {
0101     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0102     struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
0103
0104     return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
0105            LLC_PDU_TYPE_IS_U(pdu) &&
0106            LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
0107 }
0108
0109 int llc_sap_ev_deactivation_req(struct llc_sap *sap, struct sk_buff *skb)
0110 {
0111     struct llc_sap_state_ev *ev = llc_sap_ev(skb);
0112
0113     return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
0114            ev->prim_type == LLC_SAP_EV_DEACTIVATION_REQ ? 0 : 1;
0115 }