1 /*-
2 * Copyright (c) 2001-2003
3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
4 * All rights reserved.
5 *
6 * Author: Harti Brandt <[email protected]>
7 *
8 * Redistribution of this software and documentation and use in source and
9 * binary forms, with or without modification, are permitted provided that
10 * the following conditions are met:
11 *
12 * 1. Redistributions of source code or documentation must retain the above
13 * copyright notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS
19 * AND ITS CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * FRAUNHOFER FOKUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
25 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
28 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * Netgraph module for ITU-T Q.2110 SSCOP.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/errno.h>
42 #include <sys/syslog.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/callout.h>
46 #include <sys/sbuf.h>
47 #include <sys/stdint.h>
48 #include <machine/stdarg.h>
49
50 #include <netgraph/ng_message.h>
51 #include <netgraph/netgraph.h>
52 #include <netgraph/ng_parse.h>
53 #include <netnatm/saal/sscopdef.h>
54 #include <netgraph/atm/ng_sscop.h>
55 #include <netgraph/atm/sscop/ng_sscop_cust.h>
56 #include <netnatm/saal/sscop.h>
57
58 #define DDD printf("%s: %d\n", __func__, __LINE__)
59
60 #ifdef SSCOP_DEBUG
61 #define VERBOSE(P,M,F) \
62 do { \
63 if (sscop_getdebug((P)->sscop) & (M)) \
64 sscop_verbose F ; \
65 } while(0)
66 #else
67 #define VERBOSE(P,M,F)
68 #endif
69
70 MALLOC_DEFINE(M_NG_SSCOP, "netgraph_sscop", "netgraph sscop node");
71
72 MODULE_DEPEND(ng_sscop, ngatmbase, 1, 1, 1);
73
74 struct stats {
75 uint64_t in_packets;
76 uint64_t out_packets;
77 uint64_t aa_signals;
78 uint64_t errors;
79 uint64_t data_delivered;
80 uint64_t aa_dropped;
81 uint64_t maa_dropped;
82 uint64_t maa_signals;
83 uint64_t in_dropped;
84 uint64_t out_dropped;
85 };
86
87 /*
88 * Private data
89 */
90 struct priv {
91 hook_p upper; /* SAAL interface */
92 hook_p lower; /* AAL5 interface */
93 hook_p manage; /* management interface */
94
95 struct sscop *sscop; /* sscop state */
96 int enabled; /* whether the protocol is enabled */
97 int flow; /* flow control states */
98 struct stats stats; /* sadistics */
99 };
100
101 /*
102 * Parse PARAM type
103 */
104 static const struct ng_parse_struct_field ng_sscop_param_type_info[] =
105 NG_SSCOP_PARAM_INFO;
106
107 static const struct ng_parse_type ng_sscop_param_type = {
108 &ng_parse_struct_type,
109 ng_sscop_param_type_info
110 };
111
112 /*
113 * Parse a SET PARAM type.
114 */
115 static const struct ng_parse_struct_field ng_sscop_setparam_type_info[] =
116 NG_SSCOP_SETPARAM_INFO;
117
118 static const struct ng_parse_type ng_sscop_setparam_type = {
119 &ng_parse_struct_type,
120 ng_sscop_setparam_type_info,
121 };
122
123 /*
124 * Parse a SET PARAM response
125 */
126 static const struct ng_parse_struct_field ng_sscop_setparam_resp_type_info[] =
127 NG_SSCOP_SETPARAM_RESP_INFO;
128
129 static const struct ng_parse_type ng_sscop_setparam_resp_type = {
130 &ng_parse_struct_type,
131 ng_sscop_setparam_resp_type_info,
132 };
133
134 static const struct ng_cmdlist ng_sscop_cmdlist[] = {
135 {
136 NGM_SSCOP_COOKIE,
137 NGM_SSCOP_GETPARAM,
138 "getparam",
139 NULL,
140 &ng_sscop_param_type
141 },
142 {
143 NGM_SSCOP_COOKIE,
144 NGM_SSCOP_SETPARAM,
145 "setparam",
146 &ng_sscop_setparam_type,
147 &ng_sscop_setparam_resp_type
148 },
149 {
150 NGM_SSCOP_COOKIE,
151 NGM_SSCOP_ENABLE,
152 "enable",
153 NULL,
154 NULL
155 },
156 {
157 NGM_SSCOP_COOKIE,
158 NGM_SSCOP_DISABLE,
159 "disable",
160 NULL,
161 NULL
162 },
163 {
164 NGM_SSCOP_COOKIE,
165 NGM_SSCOP_GETDEBUG,
166 "getdebug",
167 NULL,
168 &ng_parse_hint32_type
169 },
170 {
171 NGM_SSCOP_COOKIE,
172 NGM_SSCOP_SETDEBUG,
173 "setdebug",
174 &ng_parse_hint32_type,
175 NULL
176 },
177 {
178 NGM_SSCOP_COOKIE,
179 NGM_SSCOP_GETSTATE,
180 "getstate",
181 NULL,
182 &ng_parse_uint32_type
183 },
184 { 0 }
185 };
186
187 static ng_constructor_t ng_sscop_constructor;
188 static ng_shutdown_t ng_sscop_shutdown;
189 static ng_rcvmsg_t ng_sscop_rcvmsg;
190 static ng_newhook_t ng_sscop_newhook;
191 static ng_disconnect_t ng_sscop_disconnect;
192 static ng_rcvdata_t ng_sscop_rcvlower;
193 static ng_rcvdata_t ng_sscop_rcvupper;
194 static ng_rcvdata_t ng_sscop_rcvmanage;
195
196 static int ng_sscop_mod_event(module_t, int, void *);
197
198 static struct ng_type ng_sscop_typestruct = {
199 .version = NG_ABI_VERSION,
200 .name = NG_SSCOP_NODE_TYPE,
201 .mod_event = ng_sscop_mod_event,
202 .constructor = ng_sscop_constructor,
203 .rcvmsg = ng_sscop_rcvmsg,
204 .shutdown = ng_sscop_shutdown,
205 .newhook = ng_sscop_newhook,
206 .rcvdata = ng_sscop_rcvlower,
207 .disconnect = ng_sscop_disconnect,
208 .cmdlist = ng_sscop_cmdlist,
209 };
210 NETGRAPH_INIT(sscop, &ng_sscop_typestruct);
211
212 static void sscop_send_manage(struct sscop *, void *, enum sscop_maasig,
213 struct SSCOP_MBUF_T *, u_int, u_int);
214 static void sscop_send_upper(struct sscop *, void *, enum sscop_aasig,
215 struct SSCOP_MBUF_T *, u_int);
216 static void sscop_send_lower(struct sscop *, void *,
217 struct SSCOP_MBUF_T *);
218 static void sscop_verbose(struct sscop *, void *, const char *, ...)
219 __printflike(3, 4);
220
221 static const struct sscop_funcs sscop_funcs = {
222 sscop_send_manage,
223 sscop_send_upper,
224 sscop_send_lower,
225 sscop_verbose
226 };
227
228 static void
sscop_verbose(struct sscop * sscop,void * arg,const char * fmt,...)229 sscop_verbose(struct sscop *sscop, void *arg, const char *fmt, ...)
230 {
231 va_list ap;
232
233 va_start(ap, fmt);
234 printf("sscop(%p): ", sscop);
235 vprintf(fmt, ap);
236 va_end(ap);
237 printf("\n");
238 }
239
240 /************************************************************/
241 /*
242 * NODE MANAGEMENT
243 */
244 static int
ng_sscop_constructor(node_p node)245 ng_sscop_constructor(node_p node)
246 {
247 struct priv *p;
248
249 p = malloc(sizeof(*p), M_NG_SSCOP, M_WAITOK | M_ZERO);
250
251 if ((p->sscop = sscop_create(node, &sscop_funcs)) == NULL) {
252 free(p, M_NG_SSCOP);
253 return (ENOMEM);
254 }
255 NG_NODE_SET_PRIVATE(node, p);
256
257 /* All data message received by the node are expected to change the
258 * node's state. Therefor we must ensure, that we have a writer lock. */
259 NG_NODE_FORCE_WRITER(node);
260
261 return (0);
262 }
263 static int
ng_sscop_shutdown(node_p node)264 ng_sscop_shutdown(node_p node)
265 {
266 struct priv *priv = NG_NODE_PRIVATE(node);
267
268 sscop_destroy(priv->sscop);
269
270 free(priv, M_NG_SSCOP);
271 NG_NODE_SET_PRIVATE(node, NULL);
272
273 NG_NODE_UNREF(node);
274
275 return (0);
276 }
277
278 /************************************************************/
279 /*
280 * CONTROL MESSAGES
281 */
282 /*
283 * Flow control message from upper layer.
284 * This is very experimental:
285 * If we get a message from the upper layer, that somebody has passed its
286 * high water mark, we stop updating the receive window.
287 * If we get a low watermark passed, then we raise the window up
288 * to max - current.
289 * If we get a queue status and it indicates a current below the
290 * high watermark, we unstop window updates (if they are stopped) and
291 * raise the window to highwater - current.
292 */
293 static int
flow_upper(node_p node,struct ng_mesg * msg)294 flow_upper(node_p node, struct ng_mesg *msg)
295 {
296 struct ngm_queue_state *q;
297 struct priv *priv = NG_NODE_PRIVATE(node);
298 u_int window, space;
299
300 if (msg->header.arglen != sizeof(struct ngm_queue_state))
301 return (EINVAL);
302 q = (struct ngm_queue_state *)msg->data;
303
304 switch (msg->header.cmd) {
305 case NGM_HIGH_WATER_PASSED:
306 if (priv->flow) {
307 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
308 "flow control stopped"));
309 priv->flow = 0;
310 }
311 break;
312
313 case NGM_LOW_WATER_PASSED:
314 window = sscop_window(priv->sscop, 0);
315 space = q->max_queuelen_packets - q->current;
316 if (space > window) {
317 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
318 "flow control opened window by %u messages",
319 space - window));
320 (void)sscop_window(priv->sscop, space - window);
321 }
322 priv->flow = 1;
323 break;
324
325 case NGM_SYNC_QUEUE_STATE:
326 if (q->high_watermark <= q->current)
327 break;
328 window = sscop_window(priv->sscop, 0);
329 if (priv->flow)
330 space = q->max_queuelen_packets - q->current;
331 else
332 space = q->high_watermark - q->current;
333 if (space > window) {
334 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
335 "flow control opened window by %u messages",
336 space - window));
337 (void)sscop_window(priv->sscop, space - window);
338 }
339 priv->flow = 1;
340 break;
341
342 default:
343 return (EINVAL);
344 }
345 return (0);
346 }
347
348 static int
flow_lower(node_p node,struct ng_mesg * msg)349 flow_lower(node_p node, struct ng_mesg *msg)
350 {
351 struct priv *priv = NG_NODE_PRIVATE(node);
352
353 if (msg->header.arglen != sizeof(struct ngm_queue_state))
354 return (EINVAL);
355
356 switch (msg->header.cmd) {
357 case NGM_HIGH_WATER_PASSED:
358 sscop_setbusy(priv->sscop, 1);
359 break;
360
361 case NGM_LOW_WATER_PASSED:
362 sscop_setbusy(priv->sscop, 1);
363 break;
364
365 default:
366 return (EINVAL);
367 }
368 return (0);
369 }
370
371 /*
372 * Produce a readable status description
373 */
374 static int
text_status(node_p node,struct priv * priv,char * arg,u_int len)375 text_status(node_p node, struct priv *priv, char *arg, u_int len)
376 {
377 struct sbuf sbuf;
378
379 sbuf_new(&sbuf, arg, len, 0);
380
381 if (priv->upper)
382 sbuf_printf(&sbuf, "upper hook: %s connected to %s:%s\n",
383 NG_HOOK_NAME(priv->upper),
384 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->upper))),
385 NG_HOOK_NAME(NG_HOOK_PEER(priv->upper)));
386 else
387 sbuf_printf(&sbuf, "upper hook: <not connected>\n");
388
389 if (priv->lower)
390 sbuf_printf(&sbuf, "lower hook: %s connected to %s:%s\n",
391 NG_HOOK_NAME(priv->lower),
392 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->lower))),
393 NG_HOOK_NAME(NG_HOOK_PEER(priv->lower)));
394 else
395 sbuf_printf(&sbuf, "lower hook: <not connected>\n");
396
397 if (priv->manage)
398 sbuf_printf(&sbuf, "manage hook: %s connected to %s:%s\n",
399 NG_HOOK_NAME(priv->manage),
400 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->manage))),
401 NG_HOOK_NAME(NG_HOOK_PEER(priv->manage)));
402 else
403 sbuf_printf(&sbuf, "manage hook: <not connected>\n");
404
405 sbuf_printf(&sbuf, "sscop state: %s\n",
406 !priv->enabled ? "<disabled>" :
407 sscop_statename(sscop_getstate(priv->sscop)));
408
409 sbuf_printf(&sbuf, "input packets: %ju\n",
410 (uintmax_t)priv->stats.in_packets);
411 sbuf_printf(&sbuf, "input dropped: %ju\n",
412 (uintmax_t)priv->stats.in_dropped);
413 sbuf_printf(&sbuf, "output packets: %ju\n",
414 (uintmax_t)priv->stats.out_packets);
415 sbuf_printf(&sbuf, "output dropped: %ju\n",
416 (uintmax_t)priv->stats.out_dropped);
417 sbuf_printf(&sbuf, "aa signals: %ju\n",
418 (uintmax_t)priv->stats.aa_signals);
419 sbuf_printf(&sbuf, "aa dropped: %ju\n",
420 (uintmax_t)priv->stats.aa_dropped);
421 sbuf_printf(&sbuf, "maa signals: %ju\n",
422 (uintmax_t)priv->stats.maa_signals);
423 sbuf_printf(&sbuf, "maa dropped: %ju\n",
424 (uintmax_t)priv->stats.maa_dropped);
425 sbuf_printf(&sbuf, "errors: %ju\n",
426 (uintmax_t)priv->stats.errors);
427 sbuf_printf(&sbuf, "data delivered: %ju\n",
428 (uintmax_t)priv->stats.data_delivered);
429 sbuf_printf(&sbuf, "window: %u\n",
430 sscop_window(priv->sscop, 0));
431
432 sbuf_finish(&sbuf);
433 return (sbuf_len(&sbuf));
434 }
435
436 /*
437 * Control message received.
438 */
439 static int
ng_sscop_rcvmsg(node_p node,item_p item,hook_p lasthook)440 ng_sscop_rcvmsg(node_p node, item_p item, hook_p lasthook)
441 {
442 struct priv *priv = NG_NODE_PRIVATE(node);
443 struct ng_mesg *resp = NULL;
444 struct ng_mesg *msg;
445 int error = 0;
446
447 NGI_GET_MSG(item, msg);
448
449 switch (msg->header.typecookie) {
450 case NGM_GENERIC_COOKIE:
451 switch (msg->header.cmd) {
452 case NGM_TEXT_STATUS:
453 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
454 if (resp == NULL) {
455 error = ENOMEM;
456 break;
457 }
458
459 resp->header.arglen = text_status(node, priv,
460 (char *)resp->data, resp->header.arglen) + 1;
461 break;
462
463 default:
464 error = EINVAL;
465 break;
466 }
467 break;
468
469 case NGM_FLOW_COOKIE:
470 if (priv->enabled && lasthook != NULL) {
471 if (lasthook == priv->upper)
472 error = flow_upper(node, msg);
473 else if (lasthook == priv->lower)
474 error = flow_lower(node, msg);
475 }
476 break;
477
478 case NGM_SSCOP_COOKIE:
479 switch (msg->header.cmd) {
480 case NGM_SSCOP_GETPARAM:
481 {
482 struct sscop_param *p;
483
484 NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
485 if (resp == NULL) {
486 error = ENOMEM;
487 break;
488 }
489 p = (struct sscop_param *)resp->data;
490 sscop_getparam(priv->sscop, p);
491 break;
492 }
493
494 case NGM_SSCOP_SETPARAM:
495 {
496 struct ng_sscop_setparam *arg;
497 struct ng_sscop_setparam_resp *p;
498
499 if (msg->header.arglen != sizeof(*arg)) {
500 error = EINVAL;
501 break;
502 }
503 if (priv->enabled) {
504 error = EISCONN;
505 break;
506 }
507 arg = (struct ng_sscop_setparam *)msg->data;
508 NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
509 if (resp == NULL) {
510 error = ENOMEM;
511 break;
512 }
513 p = (struct ng_sscop_setparam_resp *)resp->data;
514 p->mask = arg->mask;
515 p->error = sscop_setparam(priv->sscop,
516 &arg->param, &p->mask);
517 break;
518 }
519
520 case NGM_SSCOP_ENABLE:
521 if (msg->header.arglen != 0) {
522 error = EINVAL;
523 break;
524 }
525 if (priv->enabled) {
526 error = EBUSY;
527 break;
528 }
529 priv->enabled = 1;
530 priv->flow = 1;
531 memset(&priv->stats, 0, sizeof(priv->stats));
532 break;
533
534 case NGM_SSCOP_DISABLE:
535 if (msg->header.arglen != 0) {
536 error = EINVAL;
537 break;
538 }
539 if (!priv->enabled) {
540 error = ENOTCONN;
541 break;
542 }
543 priv->enabled = 0;
544 sscop_reset(priv->sscop);
545 break;
546
547 case NGM_SSCOP_GETDEBUG:
548 if (msg->header.arglen != 0) {
549 error = EINVAL;
550 break;
551 }
552 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
553 if(resp == NULL) {
554 error = ENOMEM;
555 break;
556 }
557 *(u_int32_t *)resp->data = sscop_getdebug(priv->sscop);
558 break;
559
560 case NGM_SSCOP_SETDEBUG:
561 if (msg->header.arglen != sizeof(u_int32_t)) {
562 error = EINVAL;
563 break;
564 }
565 sscop_setdebug(priv->sscop, *(u_int32_t *)msg->data);
566 break;
567
568 case NGM_SSCOP_GETSTATE:
569 if (msg->header.arglen != 0) {
570 error = EINVAL;
571 break;
572 }
573 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
574 if(resp == NULL) {
575 error = ENOMEM;
576 break;
577 }
578 *(u_int32_t *)resp->data =
579 priv->enabled ? (sscop_getstate(priv->sscop) + 1)
580 : 0;
581 break;
582
583 default:
584 error = EINVAL;
585 break;
586 }
587 break;
588
589 default:
590 error = EINVAL;
591 break;
592 }
593
594 NG_RESPOND_MSG(error, node, item, resp);
595 NG_FREE_MSG(msg);
596
597 return (error);
598 }
599
600 /************************************************************/
601 /*
602 * HOOK MANAGEMENT
603 */
604 static int
ng_sscop_newhook(node_p node,hook_p hook,const char * name)605 ng_sscop_newhook(node_p node, hook_p hook, const char *name)
606 {
607 struct priv *priv = NG_NODE_PRIVATE(node);
608
609 if(strcmp(name, "upper") == 0) {
610 priv->upper = hook;
611 NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvupper);
612 } else if(strcmp(name, "lower") == 0) {
613 priv->lower = hook;
614 } else if(strcmp(name, "manage") == 0) {
615 priv->manage = hook;
616 NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvmanage);
617 } else
618 return EINVAL;
619
620 return 0;
621 }
622 static int
ng_sscop_disconnect(hook_p hook)623 ng_sscop_disconnect(hook_p hook)
624 {
625 node_p node = NG_HOOK_NODE(hook);
626 struct priv *priv = NG_NODE_PRIVATE(node);
627
628 if(hook == priv->upper)
629 priv->upper = NULL;
630 else if(hook == priv->lower)
631 priv->lower = NULL;
632 else if(hook == priv->manage)
633 priv->manage = NULL;
634
635 if(NG_NODE_NUMHOOKS(node) == 0) {
636 if(NG_NODE_IS_VALID(node))
637 ng_rmnode_self(node);
638 } else {
639 /*
640 * Imply a release request, if the upper layer is
641 * disconnected.
642 */
643 if(priv->upper == NULL && priv->lower != NULL &&
644 priv->enabled &&
645 sscop_getstate(priv->sscop) != SSCOP_IDLE) {
646 sscop_aasig(priv->sscop, SSCOP_RELEASE_request,
647 NULL, 0);
648 }
649 }
650 return 0;
651 }
652
653 /************************************************************/
654 /*
655 * DATA
656 */
657 static int
ng_sscop_rcvlower(hook_p hook,item_p item)658 ng_sscop_rcvlower(hook_p hook, item_p item)
659 {
660 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
661 struct mbuf *m;
662
663 if (!priv->enabled) {
664 NG_FREE_ITEM(item);
665 return EINVAL;
666 }
667
668 /*
669 * If we are disconnected at the upper layer and in the IDLE
670 * state, drop any incoming packet.
671 */
672 if (priv->upper != NULL || sscop_getstate(priv->sscop) != SSCOP_IDLE) {
673 NGI_GET_M(item, m);
674 priv->stats.in_packets++;
675 sscop_input(priv->sscop, m);
676 } else {
677 priv->stats.in_dropped++;
678 }
679 NG_FREE_ITEM(item);
680
681 return (0);
682 }
683
684 static void
sscop_send_lower(struct sscop * sscop,void * p,struct mbuf * m)685 sscop_send_lower(struct sscop *sscop, void *p, struct mbuf *m)
686 {
687 node_p node = (node_p)p;
688 struct priv *priv = NG_NODE_PRIVATE(node);
689 int error;
690
691 if (priv->lower == NULL) {
692 m_freem(m);
693 priv->stats.out_dropped++;
694 return;
695 }
696
697 priv->stats.out_packets++;
698 NG_SEND_DATA_ONLY(error, priv->lower, m);
699 }
700
701 static int
ng_sscop_rcvupper(hook_p hook,item_p item)702 ng_sscop_rcvupper(hook_p hook, item_p item)
703 {
704 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
705 struct sscop_arg a;
706 struct mbuf *m;
707
708 if (!priv->enabled) {
709 NG_FREE_ITEM(item);
710 return (EINVAL);
711 }
712
713 /*
714 * If the lower layer is not connected allow to proceed.
715 * The lower layer sending function will drop outgoing frames,
716 * and the sscop will timeout any establish requests.
717 */
718 NGI_GET_M(item, m);
719 NG_FREE_ITEM(item);
720
721 if (!(m->m_flags & M_PKTHDR)) {
722 printf("no pkthdr\n");
723 m_freem(m);
724 return (EINVAL);
725 }
726 if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
727 return (ENOBUFS);
728 bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
729 m_adj(m, sizeof(a));
730
731 return (sscop_aasig(priv->sscop, a.sig, m, a.arg));
732 }
733
734 static void
sscop_send_upper(struct sscop * sscop,void * p,enum sscop_aasig sig,struct SSCOP_MBUF_T * m,u_int arg)735 sscop_send_upper(struct sscop *sscop, void *p, enum sscop_aasig sig,
736 struct SSCOP_MBUF_T *m, u_int arg)
737 {
738 node_p node = (node_p)p;
739 struct priv *priv = NG_NODE_PRIVATE(node);
740 int error;
741 struct sscop_arg *a;
742
743 if (sig == SSCOP_DATA_indication && priv->flow)
744 sscop_window(priv->sscop, 1);
745
746 if (priv->upper == NULL) {
747 if (m != NULL)
748 m_freem(m);
749 priv->stats.aa_dropped++;
750 return;
751 }
752
753 priv->stats.aa_signals++;
754 if (sig == SSCOP_DATA_indication)
755 priv->stats.data_delivered++;
756
757 if (m == NULL) {
758 MGETHDR(m, M_NOWAIT, MT_DATA);
759 if (m == NULL)
760 return;
761 m->m_len = sizeof(struct sscop_arg);
762 m->m_pkthdr.len = m->m_len;
763 } else {
764 M_PREPEND(m, sizeof(struct sscop_arg), M_NOWAIT);
765 if (m == NULL)
766 return;
767 }
768 a = mtod(m, struct sscop_arg *);
769 a->sig = sig;
770 a->arg = arg;
771
772 NG_SEND_DATA_ONLY(error, priv->upper, m);
773 }
774
775 static int
ng_sscop_rcvmanage(hook_p hook,item_p item)776 ng_sscop_rcvmanage(hook_p hook, item_p item)
777 {
778 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
779 struct sscop_marg a;
780 struct mbuf *m;
781
782 if (!priv->enabled) {
783 NG_FREE_ITEM(item);
784 return (EINVAL);
785 }
786
787 NGI_GET_M(item, m);
788 NG_FREE_ITEM(item);
789
790 if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
791 return (ENOBUFS);
792 bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
793 m_adj(m, sizeof(a));
794
795 return (sscop_maasig(priv->sscop, a.sig, m));
796 }
797
798 static void
sscop_send_manage(struct sscop * sscop,void * p,enum sscop_maasig sig,struct SSCOP_MBUF_T * m,u_int err,u_int cnt)799 sscop_send_manage(struct sscop *sscop, void *p, enum sscop_maasig sig,
800 struct SSCOP_MBUF_T *m, u_int err, u_int cnt)
801 {
802 node_p node = (node_p)p;
803 struct priv *priv = NG_NODE_PRIVATE(node);
804 int error;
805 struct sscop_merr *e;
806 struct sscop_marg *a;
807
808 if (priv->manage == NULL) {
809 if (m != NULL)
810 m_freem(m);
811 priv->stats.maa_dropped++;
812 return;
813 }
814
815 if (sig == SSCOP_MERROR_indication) {
816 MGETHDR(m, M_NOWAIT, MT_DATA);
817 if (m == NULL)
818 return;
819 m->m_len = sizeof(*e);
820 m->m_pkthdr.len = m->m_len;
821 e = mtod(m, struct sscop_merr *);
822 e->sig = sig;
823 e->err = err;
824 e->cnt = cnt;
825 priv->stats.errors++;
826 } else if (m == NULL) {
827 MGETHDR(m, M_NOWAIT, MT_DATA);
828 if (m == NULL)
829 return;
830 m->m_len = sizeof(*a);
831 m->m_pkthdr.len = m->m_len;
832 a = mtod(m, struct sscop_marg *);
833 a->sig = sig;
834 priv->stats.maa_signals++;
835 } else {
836 M_PREPEND(m, sizeof(*a), M_NOWAIT);
837 if (m == NULL)
838 return;
839 a = mtod(m, struct sscop_marg *);
840 a->sig = sig;
841 priv->stats.maa_signals++;
842 }
843
844 NG_SEND_DATA_ONLY(error, priv->manage, m);
845 }
846
847 /************************************************************/
848 /*
849 * INITIALISATION
850 */
851
852 /*
853 * Loading and unloading of node type
854 */
855 static int
ng_sscop_mod_event(module_t mod,int event,void * data)856 ng_sscop_mod_event(module_t mod, int event, void *data)
857 {
858 int error = 0;
859
860 switch (event) {
861 case MOD_LOAD:
862 break;
863
864 case MOD_UNLOAD:
865 break;
866
867 default:
868 error = EOPNOTSUPP;
869 break;
870 }
871 return (error);
872 }
873