net/llc/llc_c_ev.c

   1 /*
   2  * llc_c_ev.c - Connection component state transition event qualifiers
   3  *
   4  * A 'state' consists of a number of possible event matching functions,
   5  * the actions associated with each being executed when that event is
   6  * matched; a 'state machine' accepts events in a serial fashion from an
   7  * event queue. Each event is passed to each successive event matching
   8  * function until a match is made (the event matching function returns
   9  * success, or '0') or the list of event matching functions is exhausted.
  10  * If a match is made, the actions associated with the event are executed
  11  * and the state is changed to that event's transition state. Before some
  12  * events are recognized, even after a match has been made, a certain
  13  * number of 'event qualifier' functions must also be executed. If these
  14  * all execute successfully, then the event is finally executed.
  15  *
  16  * These event functions must return 0 for success, to show a matched
  17  * event, of 1 if the event does not match. Event qualifier functions
  18  * must return a 0 for success or a non-zero for failure. Each function
  19  * is simply responsible for verifying one single thing and returning
  20  * either a success or failure.
  21  *
  22  * All of followed event functions are described in 802.2 LLC Protocol
  23  * standard document except two functions that we added that will explain
  24  * in their comments, at below.
  25  *
  26  * Copyright (c) 1997 by Procom Technology, Inc.
  27  *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  28  *
  29  * This program can be redistributed or modified under the terms of the
  30  * GNU General Public License as published by the Free Software Foundation.
  31  * This program is distributed without any warranty or implied warranty
  32  * of merchantability or fitness for a particular purpose.
  33  *
  34  * See the GNU General Public License for more details.
  35  */
  36 #include <linux/netdevice.h>
  37 #include <net/llc_conn.h>
  38 #include <net/llc_sap.h>
  39 #include <net/sock.h>
  40 #include <net/llc_c_ev.h>
  41 #include <net/llc_pdu.h>
  42
  43 #if 1
  44 #define dprintk(args...) printk(KERN_DEBUG args)
  45 #else
  46 #define dprintk(args...)
  47 #endif
  48
  49 extern u16 llc_circular_between(u8 a, u8 b, u8 c);
  50
  51 /**
  52  *      llc_util_ns_inside_rx_window - check if sequence number is in rx window
  53  *      @ns: sequence number of received pdu.
  54  *      @vr: sequence number which receiver expects to receive.
  55  *      @rw: receive window size of receiver.
  56  *
  57  *      Checks if sequence number of received PDU is in range of receive
  58  *      window. Returns 0 for success, 1 otherwise
  59  */
  60 static u16 llc_util_ns_inside_rx_window(u8 ns, u8 vr, u8 rw)
  61 {
  62         return !llc_circular_between(vr, ns,
  63                                      (vr + rw - 1) % LLC_2_SEQ_NBR_MODULO);
  64 }
  65
  66 /**
  67  *      llc_util_nr_inside_tx_window - check if sequence number is in tx window
  68  *      @sk: current connection.
  69  *      @nr: N(R) of received PDU.
  70  *
  71  *      This routine checks if N(R) of received PDU is in range of transmit
  72  *      window; on the other hand checks if received PDU acknowledges some
  73  *      outstanding PDUs that are in transmit window. Returns 0 for success, 1
  74  *      otherwise.
  75  */
  76 static u16 llc_util_nr_inside_tx_window(struct sock *sk, u8 nr)
  77 {
  78         u8 nr1, nr2;
  79         struct sk_buff *skb;
  80         struct llc_pdu_sn *pdu;
  81         struct llc_sock *llc = llc_sk(sk);
  82         int rc = 0;
  83
  84         if (llc->dev->flags & IFF_LOOPBACK)
  85                 goto out;
  86         rc = 1;
  87         if (!skb_queue_len(&llc->pdu_unack_q))
  88                 goto out;
  89         skb = skb_peek(&llc->pdu_unack_q);
  90         pdu = llc_pdu_sn_hdr(skb);
  91         nr1 = LLC_I_GET_NS(pdu);
  92         skb = skb_peek_tail(&llc->pdu_unack_q);
  93         pdu = llc_pdu_sn_hdr(skb);
  94         nr2 = LLC_I_GET_NS(pdu);
  95         rc = !llc_circular_between(nr1, nr, (nr2 + 1) % LLC_2_SEQ_NBR_MODULO);
  96 out:
  97         return rc;
  98 }
  99
 100 int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
 101 {
 102         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 103
 104         return ev->prim == LLC_CONN_PRIM &&
 105                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
 106 }
 107
 108 int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
 109 {
 110         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 111
 112         return ev->prim == LLC_DATA_PRIM &&
 113                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
 114 }
 115
 116 int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb)
 117 {
 118         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 119
 120         return ev->prim == LLC_DISC_PRIM &&
 121                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
 122 }
 123
 124 int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb)
 125 {
 126         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 127
 128         return ev->prim == LLC_RESET_PRIM &&
 129                ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
 130 }
 131
 132 int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
 133 {
 134         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 135
 136         return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 137                ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1;
 138 }
 139
 140 int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb)
 141 {
 142         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 143
 144         return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 145                ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1;
 146 }
 147
 148 int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb)
 149 {
 150         return 1;
 151 }
 152
 153 int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 154 {
 155         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 156
 157         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 158                LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1;
 159 }
 160
 161 int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 162 {
 163         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 164
 165         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 166                LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM ? 0 : 1;
 167 }
 168
 169 int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 170 {
 171         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 172
 173         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 174                LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR ? 0 : 1;
 175 }
 176
 177 int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 178 {
 179         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 180
 181         return llc_conn_space(sk, skb) &&
 182                LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 183                LLC_I_PF_IS_0(pdu) &&
 184                LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
 185 }
 186
 187 int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 188 {
 189         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 190
 191         return llc_conn_space(sk, skb) &&
 192                LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 193                LLC_I_PF_IS_1(pdu) &&
 194                LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
 195 }
 196
 197 int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk,
 198                                               struct sk_buff *skb)
 199 {
 200         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 201         u8 vr = llc_sk(sk)->vR;
 202         u8 ns = LLC_I_GET_NS(pdu);
 203
 204         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 205                LLC_I_PF_IS_0(pdu) && ns != vr &&
 206                !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 207 }
 208
 209 int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
 210                                               struct sk_buff *skb)
 211 {
 212         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 213         u8 vr = llc_sk(sk)->vR;
 214         u8 ns = LLC_I_GET_NS(pdu);
 215
 216         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 217                LLC_I_PF_IS_1(pdu) && ns != vr &&
 218                !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 219 }
 220
 221 int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
 222                                              struct sk_buff *skb)
 223 {
 224         struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb);
 225         u8 vr = llc_sk(sk)->vR;
 226         u8 ns = LLC_I_GET_NS(pdu);
 227         u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
 228                  llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 229         if (!rc)
 230                 dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
 231                         __FUNCTION__, llc_sk(sk)->state, ns, vr);
 232         return rc;
 233 }
 234
 235 int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 236 {
 237         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 238
 239         return llc_conn_space(sk, skb) &&
 240                LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 241                LLC_I_PF_IS_0(pdu) &&
 242                LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
 243 }
 244
 245 int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 246 {
 247         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 248
 249         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 250                LLC_I_PF_IS_1(pdu) &&
 251                LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
 252 }
 253
 254 int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 255 {
 256         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 257
 258         return llc_conn_space(sk, skb) &&
 259                LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 260                LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1;
 261 }
 262
 263 int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk,
 264                                               struct sk_buff *skb)
 265 {
 266         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 267         u8 vr = llc_sk(sk)->vR;
 268         u8 ns = LLC_I_GET_NS(pdu);
 269
 270         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 271                LLC_I_PF_IS_0(pdu) && ns != vr &&
 272                !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 273 }
 274
 275 int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk,
 276                                               struct sk_buff *skb)
 277 {
 278         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 279         u8 vr = llc_sk(sk)->vR;
 280         u8 ns = LLC_I_GET_NS(pdu);
 281
 282         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 283                LLC_I_PF_IS_1(pdu) && ns != vr &&
 284                !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 285 }
 286
 287 int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk,
 288                                               struct sk_buff *skb)
 289 {
 290         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 291         u8 vr = llc_sk(sk)->vR;
 292         u8 ns = LLC_I_GET_NS(pdu);
 293
 294         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
 295                !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 296 }
 297
 298 int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk,
 299                                              struct sk_buff *skb)
 300 {
 301         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 302         u8 vr = llc_sk(sk)->vR;
 303         u8 ns = LLC_I_GET_NS(pdu);
 304         u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
 305                  llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 306         if (!rc)
 307                 dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
 308                         __FUNCTION__, llc_sk(sk)->state, ns, vr);
 309         return rc;
 310 }
 311
 312 int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 313 {
 314         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 315
 316         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 317                LLC_S_PF_IS_0(pdu) &&
 318                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1;
 319 }
 320
 321 int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 322 {
 323         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 324
 325         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 326                LLC_S_PF_IS_1(pdu) &&
 327                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1;
 328 }
 329
 330 int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 331 {
 332         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 333
 334         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 335                LLC_S_PF_IS_0(pdu) &&
 336                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
 337 }
 338
 339 int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 340 {
 341         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 342
 343         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 344                LLC_S_PF_IS_1(pdu) &&
 345                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
 346 }
 347
 348 int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 349 {
 350         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 351
 352         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 353                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
 354 }
 355
 356 int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 357 {
 358         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 359
 360         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 361                LLC_S_PF_IS_0(pdu) &&
 362                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1;
 363 }
 364
 365 int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 366 {
 367         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 368
 369         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 370                LLC_S_PF_IS_1(pdu) &&
 371                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1;
 372 }
 373
 374 int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 375 {
 376         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 377
 378         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 379                LLC_S_PF_IS_0(pdu) &&
 380                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
 381 }
 382
 383 int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 384 {
 385         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 386
 387         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 388                LLC_S_PF_IS_1(pdu) &&
 389                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1;
 390 }
 391
 392 int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 393 {
 394         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 395
 396         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 397                LLC_S_PF_IS_0(pdu) &&
 398                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
 399 }
 400
 401 int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 402 {
 403         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 404
 405         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 406                LLC_S_PF_IS_1(pdu) &&
 407                LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1;
 408 }
 409
 410 int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 411 {
 412         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 413
 414         return llc_conn_space(sk, skb) &&
 415                LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 416                LLC_S_PF_IS_0(pdu) &&
 417                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
 418 }
 419
 420 int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 421 {
 422         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 423
 424         return llc_conn_space(sk, skb) &&
 425                LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 426                LLC_S_PF_IS_1(pdu) &&
 427                LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1;
 428 }
 429
 430 int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 431 {
 432         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 433
 434         return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 435                LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1;
 436 }
 437
 438 int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 439 {
 440         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 441
 442         return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 443                LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_UA ? 0 : 1;
 444 }
 445
 446 int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 447 {
 448         u16 rc = 1;
 449         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 450
 451         if (LLC_PDU_IS_CMD(pdu)) {
 452                 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
 453                         if (LLC_I_PF_IS_1(pdu))
 454                                 rc = 0;
 455                 } else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu))
 456                         rc = 0;
 457         }
 458         return rc;
 459 }
 460
 461 int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 462 {
 463         u16 rc = 1;
 464         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 465
 466         if (LLC_PDU_IS_CMD(pdu)) {
 467                 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
 468                         rc = 0;
 469                 else if (LLC_PDU_TYPE_IS_U(pdu))
 470                         switch (LLC_U_PDU_CMD(pdu)) {
 471                         case LLC_2_PDU_CMD_SABME:
 472                         case LLC_2_PDU_CMD_DISC:
 473                                 rc = 0;
 474                                 break;
 475                         }
 476         }
 477         return rc;
 478 }
 479
 480 int llc_conn_ev_rx_xxx_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 481 {
 482         u16 rc = 1;
 483         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 484
 485         if (LLC_PDU_IS_RSP(pdu)) {
 486                 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
 487                         if (LLC_I_PF_IS_1(pdu))
 488                                 rc = 0;
 489                 } else if (LLC_PDU_TYPE_IS_U(pdu))
 490                         switch (LLC_U_PDU_RSP(pdu)) {
 491                         case LLC_2_PDU_RSP_UA:
 492                         case LLC_2_PDU_RSP_DM:
 493                         case LLC_2_PDU_RSP_FRMR:
 494                                 if (LLC_U_PF_IS_1(pdu))
 495                                         rc = 0;
 496                                 break;
 497                         }
 498         }
 499         return rc;
 500 }
 501
 502 int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 503 {
 504         u16 rc = 1;
 505         struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 506
 507         if (LLC_PDU_IS_RSP(pdu)) {
 508                 if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
 509                         rc = 0;
 510                 else if (LLC_PDU_TYPE_IS_U(pdu))
 511                         switch (LLC_U_PDU_RSP(pdu)) {
 512                         case LLC_2_PDU_RSP_UA:
 513                         case LLC_2_PDU_RSP_DM:
 514                         case LLC_2_PDU_RSP_FRMR:
 515                                 rc = 0;
 516                                 break;
 517                         }
 518         }
 519
 520         return rc;
 521 }
 522
 523 int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
 524                                                struct sk_buff *skb)
 525 {
 526         u16 rc = 1;
 527         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 528         u8 vs = llc_sk(sk)->vS;
 529         u8 nr = LLC_I_GET_NR(pdu);
 530
 531         if (LLC_PDU_IS_CMD(pdu) &&
 532             (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
 533             nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
 534                 dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
 535                         __FUNCTION__, llc_sk(sk)->state, vs, nr);
 536                 rc = 0;
 537         }
 538         return rc;
 539 }
 540
 541 int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk,
 542                                                struct sk_buff *skb)
 543 {
 544         u16 rc = 1;
 545         struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 546         u8 vs = llc_sk(sk)->vS;
 547         u8 nr = LLC_I_GET_NR(pdu);
 548
 549         if (LLC_PDU_IS_RSP(pdu) &&
 550             (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
 551             nr != vs && llc_util_nr_inside_tx_window(sk, nr)) {
 552                 rc = 0;
 553                 dprintk("%s: matched, state=%d, vs=%d, nr=%d\n",
 554                         __FUNCTION__, llc_sk(sk)->state, vs, nr);
 555         }
 556         return rc;
 557 }
 558
 559 int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb)
 560 {
 561         return 0;
 562 }
 563
 564 int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb)
 565 {
 566         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 567
 568         return ev->type != LLC_CONN_EV_TYPE_P_TMR;
 569 }
 570
 571 int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb)
 572 {
 573         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 574
 575         return ev->type != LLC_CONN_EV_TYPE_ACK_TMR;
 576 }
 577
 578 int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb)
 579 {
 580         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 581
 582         return ev->type != LLC_CONN_EV_TYPE_REJ_TMR;
 583 }
 584
 585 int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb)
 586 {
 587         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 588
 589         return ev->type != LLC_CONN_EV_TYPE_BUSY_TMR;
 590 }
 591
 592 int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb)
 593 {
 594         return 1;
 595 }
 596
 597 int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
 598 {
 599         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 600
 601         return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 602                ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1;
 603 }
 604
 605 /* Event qualifier functions
 606  *
 607  * these functions simply verify the value of a state flag associated with
 608  * the connection and return either a 0 for success or a non-zero value
 609  * for not-success; verify the event is the type we expect
 610  */
 611 int llc_conn_ev_qlfy_data_flag_eq_1(struct sock *sk, struct sk_buff *skb)
 612 {
 613         return llc_sk(sk)->data_flag != 1;
 614 }
 615
 616 int llc_conn_ev_qlfy_data_flag_eq_0(struct sock *sk, struct sk_buff *skb)
 617 {
 618         return llc_sk(sk)->data_flag;
 619 }
 620
 621 int llc_conn_ev_qlfy_data_flag_eq_2(struct sock *sk, struct sk_buff *skb)
 622 {
 623         return llc_sk(sk)->data_flag != 2;
 624 }
 625
 626 int llc_conn_ev_qlfy_p_flag_eq_1(struct sock *sk, struct sk_buff *skb)
 627 {
 628         return llc_sk(sk)->p_flag != 1;
 629 }
 630
 631 /**
 632  *      conn_ev_qlfy_last_frame_eq_1 - checks if frame is last in tx window
 633  *      @sk: current connection structure.
 634  *      @skb: current event.
 635  *
 636  *      This function determines when frame which is sent, is last frame of
 637  *      transmit window, if it is then this function return zero else return
 638  *      one.  This function is used for sending last frame of transmit window
 639  *      as I-format command with p-bit set to one. Returns 0 if frame is last
 640  *      frame, 1 otherwise.
 641  */
 642 int llc_conn_ev_qlfy_last_frame_eq_1(struct sock *sk, struct sk_buff *skb)
 643 {
 644         return !(skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k);
 645 }
 646
 647 /**
 648  *      conn_ev_qlfy_last_frame_eq_0 - checks if frame isn't last in tx window
 649  *      @sk: current connection structure.
 650  *      @skb: current event.
 651  *
 652  *      This function determines when frame which is sent, isn't last frame of
 653  *      transmit window, if it isn't then this function return zero else return
 654  *      one. Returns 0 if frame isn't last frame, 1 otherwise.
 655  */
 656 int llc_conn_ev_qlfy_last_frame_eq_0(struct sock *sk, struct sk_buff *skb)
 657 {
 658         return skb_queue_len(&llc_sk(sk)->pdu_unack_q) + 1 == llc_sk(sk)->k;
 659 }
 660
 661 int llc_conn_ev_qlfy_p_flag_eq_0(struct sock *sk, struct sk_buff *skb)
 662 {
 663         return llc_sk(sk)->p_flag;
 664 }
 665
 666 int llc_conn_ev_qlfy_p_flag_eq_f(struct sock *sk, struct sk_buff *skb)
 667 {
 668         u8 f_bit;
 669
 670         llc_pdu_decode_pf_bit(skb, &f_bit);
 671         return llc_sk(sk)->p_flag == f_bit ? 0 : 1;
 672 }
 673
 674 int llc_conn_ev_qlfy_remote_busy_eq_0(struct sock *sk, struct sk_buff *skb)
 675 {
 676         return llc_sk(sk)->remote_busy_flag;
 677 }
 678
 679 int llc_conn_ev_qlfy_remote_busy_eq_1(struct sock *sk, struct sk_buff *skb)
 680 {
 681         return !llc_sk(sk)->remote_busy_flag;
 682 }
 683
 684 int llc_conn_ev_qlfy_retry_cnt_lt_n2(struct sock *sk, struct sk_buff *skb)
 685 {
 686         return !(llc_sk(sk)->retry_count < llc_sk(sk)->n2);
 687 }
 688
 689 int llc_conn_ev_qlfy_retry_cnt_gte_n2(struct sock *sk, struct sk_buff *skb)
 690 {
 691         return !(llc_sk(sk)->retry_count >= llc_sk(sk)->n2);
 692 }
 693
 694 int llc_conn_ev_qlfy_s_flag_eq_1(struct sock *sk, struct sk_buff *skb)
 695 {
 696         return !llc_sk(sk)->s_flag;
 697 }
 698
 699 int llc_conn_ev_qlfy_s_flag_eq_0(struct sock *sk, struct sk_buff *skb)
 700 {
 701         return llc_sk(sk)->s_flag;
 702 }
 703
 704 int llc_conn_ev_qlfy_cause_flag_eq_1(struct sock *sk, struct sk_buff *skb)
 705 {
 706         return !llc_sk(sk)->cause_flag;
 707 }
 708
 709 int llc_conn_ev_qlfy_cause_flag_eq_0(struct sock *sk, struct sk_buff *skb)
 710 {
 711         return llc_sk(sk)->cause_flag;
 712 }
 713
 714 int llc_conn_ev_qlfy_set_status_conn(struct sock *sk, struct sk_buff *skb)
 715 {
 716         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 717
 718         ev->status = LLC_STATUS_CONN;
 719         return 0;
 720 }
 721
 722 int llc_conn_ev_qlfy_set_status_disc(struct sock *sk, struct sk_buff *skb)
 723 {
 724         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 725
 726         ev->status = LLC_STATUS_DISC;
 727         return 0;
 728 }
 729
 730 int llc_conn_ev_qlfy_set_status_failed(struct sock *sk, struct sk_buff *skb)
 731 {
 732         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 733
 734         ev->status = LLC_STATUS_FAILED;
 735         return 0;
 736 }
 737
 738 int llc_conn_ev_qlfy_set_status_remote_busy(struct sock *sk,
 739                                             struct sk_buff *skb)
 740 {
 741         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 742
 743         ev->status = LLC_STATUS_REMOTE_BUSY;
 744         return 0;
 745 }
 746
 747 int llc_conn_ev_qlfy_set_status_refuse(struct sock *sk, struct sk_buff *skb)
 748 {
 749         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 750
 751         ev->status = LLC_STATUS_REFUSE;
 752         return 0;
 753 }
 754
 755 int llc_conn_ev_qlfy_set_status_conflict(struct sock *sk, struct sk_buff *skb)
 756 {
 757         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 758
 759         ev->status = LLC_STATUS_CONFLICT;
 760         return 0;
 761 }
 762
 763 int llc_conn_ev_qlfy_set_status_rst_done(struct sock *sk, struct sk_buff *skb)
 764 {
 765         struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 766
 767         ev->status = LLC_STATUS_RESET_DONE;
 768         return 0;
 769 }