1 /*
2 * Copyright (c) 1997, 2000 Hellmuth Michaelis. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 *---------------------------------------------------------------------------
26 *
27 * i4b_iframe.c - i frame handling routines
28 * ------------------------------------------
29 *
30 * $Id: i4b_iframe.c,v 1.8 2005/12/11 12:25:06 christos Exp $
31 *
32 * $FreeBSD$
33 *
34 * last edit-date: [Fri Jan 5 11:33:47 2001]
35 *
36 *---------------------------------------------------------------------------*/
37
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: i4b_iframe.c,v 1.8 2005/12/11 12:25:06 christos Exp $");
40
41 #ifdef __FreeBSD__
42 #include "i4bq921.h"
43 #else
44 #define NI4BQ921 1
45 #endif
46 #if NI4BQ921 > 0
47
48 #include <sys/param.h>
49 #include <sys/kernel.h>
50 #include <sys/systm.h>
51 #include <sys/mbuf.h>
52 #include <sys/socket.h>
53 #include <net/if.h>
54
55 #if defined(__NetBSD__) && __NetBSD_Version__ >= 104230000
56 #include <sys/callout.h>
57 #endif
58
59 #ifdef __FreeBSD__
60 #include <machine/i4b_debug.h>
61 #include <machine/i4b_ioctl.h>
62 #include <machine/i4b_trace.h>
63 #else
64 #include <netisdn/i4b_debug.h>
65 #include <netisdn/i4b_ioctl.h>
66 #include <netisdn/i4b_trace.h>
67 #endif
68
69 #include <netisdn/i4b_global.h>
70 #include <netisdn/i4b_l2.h>
71 #include <netisdn/i4b_l1l2.h>
72 #include <netisdn/i4b_isdnq931.h>
73 #include <netisdn/i4b_mbuf.h>
74 #include <netisdn/i4b_l2fsm.h>
75
76 /*---------------------------------------------------------------------------*
77 * process i frame
78 * implements the routine "I COMMAND" Q.921 03/93 pp 68 and pp 77
79 *---------------------------------------------------------------------------*/
80 void
81 i4b_rxd_i_frame(l2_softc_t *l2sc, struct isdn_l3_driver *drv, struct mbuf *m)
82 {
83 u_char *ptr = m->m_data;
84 int nr;
85 int ns;
86 int p;
87 int s;
88
89 if(!((l2sc->tei_valid == TEI_VALID) &&
90 (l2sc->tei == GETTEI(*(ptr+OFF_TEI)))))
91 {
92 i4b_Dfreembuf(m);
93 return;
94 }
95
96 if((l2sc->Q921_state != ST_MULTIFR) && (l2sc->Q921_state != ST_TIMREC))
97 {
98 i4b_Dfreembuf(m);
99 NDBGL2(L2_I_ERR, "ERROR, state != (MF || TR)!");
100 return;
101 }
102
103 s = splnet();
104
105 l2sc->stat.rx_i++; /* update frame count */
106
107 nr = GETINR(*(ptr + OFF_INR));
108 ns = GETINS(*(ptr + OFF_INS));
109 p = GETIP(*(ptr + OFF_INR));
110
111 i4b_rxd_ack(l2sc, drv, nr); /* last packet ack */
112
113 if(l2sc->own_busy) /* own receiver busy ? */
114 {
115 i4b_Dfreembuf(m); /* yes, discard information */
116
117 if(p == 1) /* P bit == 1 ? */
118 {
119 i4b_tx_rnr_response(l2sc, p); /* yes, tx RNR */
120 l2sc->ack_pend = 0; /* clear ACK pending */
121 }
122 }
123 else /* own receiver ready */
124 {
125 if(ns == l2sc->vr) /* expected sequence number ? */
126 {
127 M128INC(l2sc->vr); /* yes, update */
128
129 l2sc->rej_excpt = 0; /* clr reject exception */
130
131 m_adj(m, I_HDR_LEN); /* strip i frame header */
132
133 l2sc->iframe_sent = 0; /* reset i acked already */
134
135 i4b_dl_data_ind(drv, m); /* pass data up */
136
137 if(!l2sc->iframe_sent)
138 {
139 i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
140 l2sc->ack_pend = 0; /* clr ACK pending */
141 }
142 }
143 else /* ERROR, sequence number NOT expected */
144 {
145 i4b_Dfreembuf(m); /* discard information */
146
147 if(l2sc->rej_excpt == 1) /* already exception ? */
148 {
149 if(p == 1) /* immediate response ? */
150 {
151 i4b_tx_rr_response(l2sc, p); /* yes, tx RR */
152 l2sc->ack_pend = 0; /* clr ack pend */
153 }
154 }
155 else /* not in exception cond */
156 {
157 l2sc->rej_excpt = 1; /* set exception */
158 i4b_tx_rej_response(l2sc, p); /* tx REJ */
159 l2sc->ack_pend = 0; /* clr ack pending */
160 }
161 }
162 }
163
164 /* sequence number ranges as expected ? */
165
166 if(i4b_l2_nr_ok(nr, l2sc->va, l2sc->vs))
167 {
168 if(l2sc->Q921_state == ST_TIMREC)
169 {
170 l2sc->va = nr;
171
172 splx(s);
173
174 return;
175 }
176
177 if(l2sc->peer_busy) /* yes, other side busy ? */
178 {
179 l2sc->va = nr; /* yes, update ack count */
180 }
181 else /* other side ready */
182 {
183 if(nr == l2sc->vs) /* count expected ? */
184 {
185 l2sc->va = nr; /* update ack */
186 i4b_T200_stop(l2sc);
187 i4b_T203_restart(l2sc);
188 }
189 else
190 {
191 if(nr != l2sc->va)
192 {
193 l2sc->va = nr;
194 i4b_T200_restart(l2sc);
195 }
196 }
197 }
198 }
199 else
200 {
201 i4b_nr_error_recovery(l2sc); /* sequence error */
202 l2sc->Q921_state = ST_AW_EST;
203 }
204
205 splx(s);
206 }
207
208 /*---------------------------------------------------------------------------*
209 * internal I FRAME QUEUED UP routine (Q.921 03/93 p 61)
210 *---------------------------------------------------------------------------*/
211 void
212 i4b_i_frame_queued_up(l2_softc_t *l2sc)
213 {
214 struct mbuf *m;
215 u_char *ptr;
216 int s;
217
218 s = splnet();
219
220 if((l2sc->peer_busy) || (l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127)))
221 {
222 if(l2sc->peer_busy)
223 {
224 NDBGL2(L2_I_MSG, "regen IFQUP, cause: peer busy!");
225 }
226
227 if(l2sc->vs == ((l2sc->va + MAX_K_VALUE) & 127))
228 {
229 NDBGL2(L2_I_MSG, "regen IFQUP, cause: vs=va+k!");
230 }
231
232 /*
233 * XXX see: Q.921, page 36, 5.6.1 ".. may retransmit an I
234 * frame ...", shall we retransmit the last i frame ?
235 */
236
237 if(!(IF_QEMPTY(&l2sc->i_queue)))
238 {
239 NDBGL2(L2_I_MSG, "re-scheduling IFQU call!");
240 START_TIMER(l2sc->IFQU_callout, i4b_i_frame_queued_up, l2sc, IFQU_DLY);
241 }
242 splx(s);
243 return;
244 }
245
246 IF_DEQUEUE(&l2sc->i_queue, m); /* fetch next frame to tx */
247
248 if(!m)
249 {
250 NDBGL2(L2_I_ERR, "ERROR, mbuf NULL after IF_DEQUEUE");
251 splx(s);
252 return;
253 }
254
255 ptr = m->m_data;
256
257 PUTSAPI(SAPI_CCP, CR_CMD_TO_NT, *(ptr + OFF_SAPI));
258 PUTTEI(l2sc->tei, *(ptr + OFF_TEI));
259
260 *(ptr + OFF_INS) = (l2sc->vs << 1) & 0xfe; /* bit 0 = 0 */
261 *(ptr + OFF_INR) = (l2sc->vr << 1) & 0xfe; /* P bit = 0 */
262
263 l2sc->stat.tx_i++; /* update frame counter */
264
265 l2sc->driver->ph_data_req(l2sc->l1_token, m, MBUF_DONTFREE); /* free'd when ack'd ! */
266
267 l2sc->iframe_sent = 1; /* in case we ack an I frame with another I frame */
268
269 if(l2sc->ua_num != UA_EMPTY) /* failsafe */
270 {
271 NDBGL2(L2_I_ERR, "ERROR, l2sc->ua_num: %d != UA_EMPTY", l2sc->ua_num);
272 i4b_print_l2var(l2sc);
273 i4b_Dfreembuf(l2sc->ua_frame);
274 }
275
276 l2sc->ua_frame = m; /* save unacked frame */
277 l2sc->ua_num = l2sc->vs; /* save frame number */
278
279 M128INC(l2sc->vs);
280
281 l2sc->ack_pend = 0;
282
283 splx(s);
284
285 if(l2sc->T200 == TIMER_IDLE)
286 {
287 i4b_T203_stop(l2sc);
288 i4b_T200_start(l2sc);
289 }
290 }
291
292 #endif /* NI4BQ921 > 0 */
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