net/llc/llc_s_ev.c

   1 /*
   2  * llc_s_ev.c - Defines SAP component events
   3  *
   4  * The followed event functions are SAP component events which are described
   5  * in 802.2 LLC protocol standard document.
   6  *
   7  * Copyright (c) 1997 by Procom Technology, Inc.
   8  *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   9  *
  10  * This program can be redistributed or modified under the terms of the
  11  * GNU General Public License as published by the Free Software Foundation.
  12  * This program is distributed without any warranty or implied warranty
  13  * of merchantability or fitness for a particular purpose.
  14  *
  15  * See the GNU General Public License for more details.
  16  */
  17 #include <linux/socket.h>
  18 #include <net/sock.h>
  19 #include <net/llc_if.h>
  20 #include <net/llc_s_ev.h>
  21 #include <net/llc_pdu.h>
  22
  23 int llc_sap_ev_activation_req(struct llc_sap *sap, struct sk_buff *skb)
  24 {
  25         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  26
  27         return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
  28                ev->prim_type == LLC_SAP_EV_ACTIVATION_REQ ? 0 : 1;
  29 }
  30
  31 int llc_sap_ev_rx_ui(struct llc_sap *sap, struct sk_buff *skb)
  32 {
  33         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  34         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  35
  36         return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  37                LLC_PDU_TYPE_IS_U(pdu) &&
  38                LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_UI ? 0 : 1;
  39 }
  40
  41 int llc_sap_ev_unitdata_req(struct llc_sap *sap, struct sk_buff *skb)
  42 {
  43         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  44
  45         return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  46                ev->prim == LLC_DATAUNIT_PRIM &&
  47                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  48
  49 }
  50
  51 int llc_sap_ev_xid_req(struct llc_sap *sap, struct sk_buff *skb)
  52 {
  53         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  54
  55         return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  56                ev->prim == LLC_XID_PRIM &&
  57                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  58 }
  59
  60 int llc_sap_ev_rx_xid_c(struct llc_sap *sap, struct sk_buff *skb)
  61 {
  62         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  63         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  64
  65         return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  66                LLC_PDU_TYPE_IS_U(pdu) &&
  67                LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
  68 }
  69
  70 int llc_sap_ev_rx_xid_r(struct llc_sap *sap, struct sk_buff *skb)
  71 {
  72         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  73         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  74
  75         return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
  76                LLC_PDU_TYPE_IS_U(pdu) &&
  77                LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_XID ? 0 : 1;
  78 }
  79
  80 int llc_sap_ev_test_req(struct llc_sap *sap, struct sk_buff *skb)
  81 {
  82         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  83
  84         return ev->type == LLC_SAP_EV_TYPE_PRIM &&
  85                ev->prim == LLC_TEST_PRIM &&
  86                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
  87 }
  88
  89 int llc_sap_ev_rx_test_c(struct llc_sap *sap, struct sk_buff *skb)
  90 {
  91         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
  92         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
  93
  94         return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_CMD(pdu) &&
  95                LLC_PDU_TYPE_IS_U(pdu) &&
  96                LLC_U_PDU_CMD(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
  97 }
  98
  99 int llc_sap_ev_rx_test_r(struct llc_sap *sap, struct sk_buff *skb)
 100 {
 101         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 102         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 103
 104         return ev->type == LLC_SAP_EV_TYPE_PDU && LLC_PDU_IS_RSP(pdu) &&
 105                LLC_PDU_TYPE_IS_U(pdu) &&
 106                LLC_U_PDU_RSP(pdu) == LLC_1_PDU_CMD_TEST ? 0 : 1;
 107 }
 108
 109 int llc_sap_ev_deactivation_req(struct llc_sap *sap, struct sk_buff *skb)
 110 {
 111         struct llc_sap_state_ev *ev = llc_sap_ev(skb);
 112
 113         return ev->type == LLC_SAP_EV_TYPE_SIMPLE &&
 114                ev->prim_type == LLC_SAP_EV_DEACTIVATION_REQ ? 0 : 1;
 115 }