1 /*-
2 * Copyright (c) 2001-2003
3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
4 * All rights reserved.
5 *
6 * Author: Harti Brandt <harti@freebsd.org>
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: stable/10/sys/netgraph/atm/sscop/ng_sscop.c 241686 2012-10-18 13:57:24Z andre $");
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
306 case NGM_HIGH_WATER_PASSED:
307 if (priv->flow) {
308 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
309 "flow control stopped"));
310 priv->flow = 0;
311 }
312 break;
313
314 case NGM_LOW_WATER_PASSED:
315 window = sscop_window(priv->sscop, 0);
316 space = q->max_queuelen_packets - q->current;
317 if (space > window) {
318 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
319 "flow control opened window by %u messages",
320 space - window));
321 (void)sscop_window(priv->sscop, space - window);
322 }
323 priv->flow = 1;
324 break;
325
326 case NGM_SYNC_QUEUE_STATE:
327 if (q->high_watermark <= q->current)
328 break;
329 window = sscop_window(priv->sscop, 0);
330 if (priv->flow)
331 space = q->max_queuelen_packets - q->current;
332 else
333 space = q->high_watermark - q->current;
334 if (space > window) {
335 VERBOSE(priv, SSCOP_DBG_FLOW, (priv->sscop, priv,
336 "flow control opened window by %u messages",
337 space - window));
338 (void)sscop_window(priv->sscop, space - window);
339 }
340 priv->flow = 1;
341 break;
342
343 default:
344 return (EINVAL);
345 }
346 return (0);
347 }
348
349 static int
flow_lower(node_p node,struct ng_mesg * msg)350 flow_lower(node_p node, struct ng_mesg *msg)
351 {
352 struct priv *priv = NG_NODE_PRIVATE(node);
353
354 if (msg->header.arglen != sizeof(struct ngm_queue_state))
355 return (EINVAL);
356
357 switch (msg->header.cmd) {
358
359 case NGM_HIGH_WATER_PASSED:
360 sscop_setbusy(priv->sscop, 1);
361 break;
362
363 case NGM_LOW_WATER_PASSED:
364 sscop_setbusy(priv->sscop, 1);
365 break;
366
367 default:
368 return (EINVAL);
369 }
370 return (0);
371 }
372
373 /*
374 * Produce a readable status description
375 */
376 static int
text_status(node_p node,struct priv * priv,char * arg,u_int len)377 text_status(node_p node, struct priv *priv, char *arg, u_int len)
378 {
379 struct sbuf sbuf;
380
381 sbuf_new(&sbuf, arg, len, 0);
382
383 if (priv->upper)
384 sbuf_printf(&sbuf, "upper hook: %s connected to %s:%s\n",
385 NG_HOOK_NAME(priv->upper),
386 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->upper))),
387 NG_HOOK_NAME(NG_HOOK_PEER(priv->upper)));
388 else
389 sbuf_printf(&sbuf, "upper hook: <not connected>\n");
390
391 if (priv->lower)
392 sbuf_printf(&sbuf, "lower hook: %s connected to %s:%s\n",
393 NG_HOOK_NAME(priv->lower),
394 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->lower))),
395 NG_HOOK_NAME(NG_HOOK_PEER(priv->lower)));
396 else
397 sbuf_printf(&sbuf, "lower hook: <not connected>\n");
398
399 if (priv->manage)
400 sbuf_printf(&sbuf, "manage hook: %s connected to %s:%s\n",
401 NG_HOOK_NAME(priv->manage),
402 NG_NODE_NAME(NG_HOOK_NODE(NG_HOOK_PEER(priv->manage))),
403 NG_HOOK_NAME(NG_HOOK_PEER(priv->manage)));
404 else
405 sbuf_printf(&sbuf, "manage hook: <not connected>\n");
406
407 sbuf_printf(&sbuf, "sscop state: %s\n",
408 !priv->enabled ? "<disabled>" :
409 sscop_statename(sscop_getstate(priv->sscop)));
410
411 sbuf_printf(&sbuf, "input packets: %ju\n",
412 (uintmax_t)priv->stats.in_packets);
413 sbuf_printf(&sbuf, "input dropped: %ju\n",
414 (uintmax_t)priv->stats.in_dropped);
415 sbuf_printf(&sbuf, "output packets: %ju\n",
416 (uintmax_t)priv->stats.out_packets);
417 sbuf_printf(&sbuf, "output dropped: %ju\n",
418 (uintmax_t)priv->stats.out_dropped);
419 sbuf_printf(&sbuf, "aa signals: %ju\n",
420 (uintmax_t)priv->stats.aa_signals);
421 sbuf_printf(&sbuf, "aa dropped: %ju\n",
422 (uintmax_t)priv->stats.aa_dropped);
423 sbuf_printf(&sbuf, "maa signals: %ju\n",
424 (uintmax_t)priv->stats.maa_signals);
425 sbuf_printf(&sbuf, "maa dropped: %ju\n",
426 (uintmax_t)priv->stats.maa_dropped);
427 sbuf_printf(&sbuf, "errors: %ju\n",
428 (uintmax_t)priv->stats.errors);
429 sbuf_printf(&sbuf, "data delivered: %ju\n",
430 (uintmax_t)priv->stats.data_delivered);
431 sbuf_printf(&sbuf, "window: %u\n",
432 sscop_window(priv->sscop, 0));
433
434 sbuf_finish(&sbuf);
435 return (sbuf_len(&sbuf));
436 }
437
438
439 /*
440 * Control message received.
441 */
442 static int
ng_sscop_rcvmsg(node_p node,item_p item,hook_p lasthook)443 ng_sscop_rcvmsg(node_p node, item_p item, hook_p lasthook)
444 {
445 struct priv *priv = NG_NODE_PRIVATE(node);
446 struct ng_mesg *resp = NULL;
447 struct ng_mesg *msg;
448 int error = 0;
449
450 NGI_GET_MSG(item, msg);
451
452 switch (msg->header.typecookie) {
453
454 case NGM_GENERIC_COOKIE:
455 switch (msg->header.cmd) {
456
457 case NGM_TEXT_STATUS:
458 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
459 if (resp == NULL) {
460 error = ENOMEM;
461 break;
462 }
463
464 resp->header.arglen = text_status(node, priv,
465 (char *)resp->data, resp->header.arglen) + 1;
466 break;
467
468 default:
469 error = EINVAL;
470 break;
471 }
472 break;
473
474 case NGM_FLOW_COOKIE:
475 if (priv->enabled && lasthook != NULL) {
476 if (lasthook == priv->upper)
477 error = flow_upper(node, msg);
478 else if (lasthook == priv->lower)
479 error = flow_lower(node, msg);
480 }
481 break;
482
483 case NGM_SSCOP_COOKIE:
484 switch (msg->header.cmd) {
485
486 case NGM_SSCOP_GETPARAM:
487 {
488 struct sscop_param *p;
489
490 NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
491 if (resp == NULL) {
492 error = ENOMEM;
493 break;
494 }
495 p = (struct sscop_param *)resp->data;
496 sscop_getparam(priv->sscop, p);
497 break;
498 }
499
500 case NGM_SSCOP_SETPARAM:
501 {
502 struct ng_sscop_setparam *arg;
503 struct ng_sscop_setparam_resp *p;
504
505 if (msg->header.arglen != sizeof(*arg)) {
506 error = EINVAL;
507 break;
508 }
509 if (priv->enabled) {
510 error = EISCONN;
511 break;
512 }
513 arg = (struct ng_sscop_setparam *)msg->data;
514 NG_MKRESPONSE(resp, msg, sizeof(*p), M_NOWAIT);
515 if (resp == NULL) {
516 error = ENOMEM;
517 break;
518 }
519 p = (struct ng_sscop_setparam_resp *)resp->data;
520 p->mask = arg->mask;
521 p->error = sscop_setparam(priv->sscop,
522 &arg->param, &p->mask);
523 break;
524 }
525
526 case NGM_SSCOP_ENABLE:
527 if (msg->header.arglen != 0) {
528 error = EINVAL;
529 break;
530 }
531 if (priv->enabled) {
532 error = EBUSY;
533 break;
534 }
535 priv->enabled = 1;
536 priv->flow = 1;
537 memset(&priv->stats, 0, sizeof(priv->stats));
538 break;
539
540 case NGM_SSCOP_DISABLE:
541 if (msg->header.arglen != 0) {
542 error = EINVAL;
543 break;
544 }
545 if (!priv->enabled) {
546 error = ENOTCONN;
547 break;
548 }
549 priv->enabled = 0;
550 sscop_reset(priv->sscop);
551 break;
552
553 case NGM_SSCOP_GETDEBUG:
554 if (msg->header.arglen != 0) {
555 error = EINVAL;
556 break;
557 }
558 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
559 if(resp == NULL) {
560 error = ENOMEM;
561 break;
562 }
563 *(u_int32_t *)resp->data = sscop_getdebug(priv->sscop);
564 break;
565
566 case NGM_SSCOP_SETDEBUG:
567 if (msg->header.arglen != sizeof(u_int32_t)) {
568 error = EINVAL;
569 break;
570 }
571 sscop_setdebug(priv->sscop, *(u_int32_t *)msg->data);
572 break;
573
574 case NGM_SSCOP_GETSTATE:
575 if (msg->header.arglen != 0) {
576 error = EINVAL;
577 break;
578 }
579 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
580 if(resp == NULL) {
581 error = ENOMEM;
582 break;
583 }
584 *(u_int32_t *)resp->data =
585 priv->enabled ? (sscop_getstate(priv->sscop) + 1)
586 : 0;
587 break;
588
589 default:
590 error = EINVAL;
591 break;
592 }
593 break;
594
595 default:
596 error = EINVAL;
597 break;
598 }
599
600 NG_RESPOND_MSG(error, node, item, resp);
601 NG_FREE_MSG(msg);
602
603 return (error);
604 }
605
606 /************************************************************/
607 /*
608 * HOOK MANAGEMENT
609 */
610 static int
ng_sscop_newhook(node_p node,hook_p hook,const char * name)611 ng_sscop_newhook(node_p node, hook_p hook, const char *name)
612 {
613 struct priv *priv = NG_NODE_PRIVATE(node);
614
615 if(strcmp(name, "upper") == 0) {
616 priv->upper = hook;
617 NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvupper);
618 } else if(strcmp(name, "lower") == 0) {
619 priv->lower = hook;
620 } else if(strcmp(name, "manage") == 0) {
621 priv->manage = hook;
622 NG_HOOK_SET_RCVDATA(hook, ng_sscop_rcvmanage);
623 } else
624 return EINVAL;
625
626 return 0;
627 }
628 static int
ng_sscop_disconnect(hook_p hook)629 ng_sscop_disconnect(hook_p hook)
630 {
631 node_p node = NG_HOOK_NODE(hook);
632 struct priv *priv = NG_NODE_PRIVATE(node);
633
634 if(hook == priv->upper)
635 priv->upper = NULL;
636 else if(hook == priv->lower)
637 priv->lower = NULL;
638 else if(hook == priv->manage)
639 priv->manage = NULL;
640
641 if(NG_NODE_NUMHOOKS(node) == 0) {
642 if(NG_NODE_IS_VALID(node))
643 ng_rmnode_self(node);
644 } else {
645 /*
646 * Imply a release request, if the upper layer is
647 * disconnected.
648 */
649 if(priv->upper == NULL && priv->lower != NULL &&
650 priv->enabled &&
651 sscop_getstate(priv->sscop) != SSCOP_IDLE) {
652 sscop_aasig(priv->sscop, SSCOP_RELEASE_request,
653 NULL, 0);
654 }
655 }
656 return 0;
657 }
658
659 /************************************************************/
660 /*
661 * DATA
662 */
663 static int
ng_sscop_rcvlower(hook_p hook,item_p item)664 ng_sscop_rcvlower(hook_p hook, item_p item)
665 {
666 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
667 struct mbuf *m;
668
669 if (!priv->enabled) {
670 NG_FREE_ITEM(item);
671 return EINVAL;
672 }
673
674 /*
675 * If we are disconnected at the upper layer and in the IDLE
676 * state, drop any incoming packet.
677 */
678 if (priv->upper != NULL || sscop_getstate(priv->sscop) != SSCOP_IDLE) {
679 NGI_GET_M(item, m);
680 priv->stats.in_packets++;
681 sscop_input(priv->sscop, m);
682 } else {
683 priv->stats.in_dropped++;
684 }
685 NG_FREE_ITEM(item);
686
687 return (0);
688 }
689
690 static void
sscop_send_lower(struct sscop * sscop,void * p,struct mbuf * m)691 sscop_send_lower(struct sscop *sscop, void *p, struct mbuf *m)
692 {
693 node_p node = (node_p)p;
694 struct priv *priv = NG_NODE_PRIVATE(node);
695 int error;
696
697 if (priv->lower == NULL) {
698 m_freem(m);
699 priv->stats.out_dropped++;
700 return;
701 }
702
703 priv->stats.out_packets++;
704 NG_SEND_DATA_ONLY(error, priv->lower, m);
705 }
706
707 static int
ng_sscop_rcvupper(hook_p hook,item_p item)708 ng_sscop_rcvupper(hook_p hook, item_p item)
709 {
710 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
711 struct sscop_arg a;
712 struct mbuf *m;
713
714 if (!priv->enabled) {
715 NG_FREE_ITEM(item);
716 return (EINVAL);
717 }
718
719 /*
720 * If the lower layer is not connected allow to proceed.
721 * The lower layer sending function will drop outgoing frames,
722 * and the sscop will timeout any establish requests.
723 */
724 NGI_GET_M(item, m);
725 NG_FREE_ITEM(item);
726
727 if (!(m->m_flags & M_PKTHDR)) {
728 printf("no pkthdr\n");
729 m_freem(m);
730 return (EINVAL);
731 }
732 if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
733 return (ENOBUFS);
734 bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
735 m_adj(m, sizeof(a));
736
737 return (sscop_aasig(priv->sscop, a.sig, m, a.arg));
738 }
739
740 static void
sscop_send_upper(struct sscop * sscop,void * p,enum sscop_aasig sig,struct SSCOP_MBUF_T * m,u_int arg)741 sscop_send_upper(struct sscop *sscop, void *p, enum sscop_aasig sig,
742 struct SSCOP_MBUF_T *m, u_int arg)
743 {
744 node_p node = (node_p)p;
745 struct priv *priv = NG_NODE_PRIVATE(node);
746 int error;
747 struct sscop_arg *a;
748
749 if (sig == SSCOP_DATA_indication && priv->flow)
750 sscop_window(priv->sscop, 1);
751
752 if (priv->upper == NULL) {
753 if (m != NULL)
754 m_freem(m);
755 priv->stats.aa_dropped++;
756 return;
757 }
758
759 priv->stats.aa_signals++;
760 if (sig == SSCOP_DATA_indication)
761 priv->stats.data_delivered++;
762
763 if (m == NULL) {
764 MGETHDR(m, M_NOWAIT, MT_DATA);
765 if (m == NULL)
766 return;
767 m->m_len = sizeof(struct sscop_arg);
768 m->m_pkthdr.len = m->m_len;
769 } else {
770 M_PREPEND(m, sizeof(struct sscop_arg), M_NOWAIT);
771 if (m == NULL)
772 return;
773 }
774 a = mtod(m, struct sscop_arg *);
775 a->sig = sig;
776 a->arg = arg;
777
778 NG_SEND_DATA_ONLY(error, priv->upper, m);
779 }
780
781 static int
ng_sscop_rcvmanage(hook_p hook,item_p item)782 ng_sscop_rcvmanage(hook_p hook, item_p item)
783 {
784 struct priv *priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
785 struct sscop_marg a;
786 struct mbuf *m;
787
788 if (!priv->enabled) {
789 NG_FREE_ITEM(item);
790 return (EINVAL);
791 }
792
793 NGI_GET_M(item, m);
794 NG_FREE_ITEM(item);
795
796 if (m->m_len < (int)sizeof(a) && (m = m_pullup(m, sizeof(a))) == NULL)
797 return (ENOBUFS);
798 bcopy((caddr_t)mtod(m, struct sscop_arg *), &a, sizeof(a));
799 m_adj(m, sizeof(a));
800
801 return (sscop_maasig(priv->sscop, a.sig, m));
802 }
803
804 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)805 sscop_send_manage(struct sscop *sscop, void *p, enum sscop_maasig sig,
806 struct SSCOP_MBUF_T *m, u_int err, u_int cnt)
807 {
808 node_p node = (node_p)p;
809 struct priv *priv = NG_NODE_PRIVATE(node);
810 int error;
811 struct sscop_merr *e;
812 struct sscop_marg *a;
813
814 if (priv->manage == NULL) {
815 if (m != NULL)
816 m_freem(m);
817 priv->stats.maa_dropped++;
818 return;
819 }
820
821 if (sig == SSCOP_MERROR_indication) {
822 MGETHDR(m, M_NOWAIT, MT_DATA);
823 if (m == NULL)
824 return;
825 m->m_len = sizeof(*e);
826 m->m_pkthdr.len = m->m_len;
827 e = mtod(m, struct sscop_merr *);
828 e->sig = sig;
829 e->err = err;
830 e->cnt = cnt;
831 priv->stats.errors++;
832 } else if (m == NULL) {
833 MGETHDR(m, M_NOWAIT, MT_DATA);
834 if (m == NULL)
835 return;
836 m->m_len = sizeof(*a);
837 m->m_pkthdr.len = m->m_len;
838 a = mtod(m, struct sscop_marg *);
839 a->sig = sig;
840 priv->stats.maa_signals++;
841 } else {
842 M_PREPEND(m, sizeof(*a), M_NOWAIT);
843 if (m == NULL)
844 return;
845 a = mtod(m, struct sscop_marg *);
846 a->sig = sig;
847 priv->stats.maa_signals++;
848 }
849
850 NG_SEND_DATA_ONLY(error, priv->manage, m);
851 }
852
853 /************************************************************/
854 /*
855 * INITIALISATION
856 */
857
858 /*
859 * Loading and unloading of node type
860 */
861 static int
ng_sscop_mod_event(module_t mod,int event,void * data)862 ng_sscop_mod_event(module_t mod, int event, void *data)
863 {
864 int error = 0;
865
866 switch (event) {
867
868 case MOD_LOAD:
869 break;
870
871 case MOD_UNLOAD:
872 break;
873
874 default:
875 error = EOPNOTSUPP;
876 break;
877 }
878 return (error);
879 }
880