5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
37 * Author: Julian Elischer <julian@freebsd.org>
39 * $FreeBSD: src/sys/netgraph/ng_lmi.c,v 1.5.2.3 2002/07/02 22:17:18 archie Exp $
40 * $Whistle: ng_lmi.c,v 1.38 1999/11/01 09:24:52 julian Exp $
44 * This node performs the frame relay LMI protocol. It knows how
45 * to do ITU Annex A, ANSI Annex D, and "Group-of-Four" variants
48 * A specific protocol can be forced by connecting the corresponding
49 * hook to DLCI 0 or 1023 (as appropriate) of a frame relay link.
51 * Alternately, this node can do auto-detection of the LMI protocol
52 * by connecting hook "auto0" to DLCI 0 and "auto1023" to DLCI 1023.
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/errno.h>
58 #include <sys/kernel.h>
59 #include <sys/malloc.h>
61 #include <sys/syslog.h>
62 #include <netgraph/ng_message.h>
63 #include <netgraph/netgraph.h>
64 #include <netgraph/ng_lmi.h>
67 * Human readable names for LMI
69 #define NAME_ANNEXA NG_LMI_HOOK_ANNEXA
70 #define NAME_ANNEXD NG_LMI_HOOK_ANNEXD
71 #define NAME_GROUP4 NG_LMI_HOOK_GROUPOF4
72 #define NAME_NONE "None"
85 * Any received LMI frame should be at least this long
87 #define LMI_MIN_LENGTH 8 /* XXX verify */
90 * Netgraph node methods and type descriptor
92 static ng_constructor_t nglmi_constructor;
93 static ng_rcvmsg_t nglmi_rcvmsg;
94 static ng_shutdown_t nglmi_rmnode;
95 static ng_newhook_t nglmi_newhook;
96 static ng_rcvdata_t nglmi_rcvdata;
97 static ng_disconnect_t nglmi_disconnect;
98 static int nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta);
100 static struct ng_type typestruct = {
115 NETGRAPH_INIT(lmi, &typestruct);
118 * Info and status per node
121 node_p node; /* netgraph node */
122 int flags; /* state */
123 int poll_count; /* the count of times for autolmi */
124 int poll_state; /* state of auto detect machine */
125 u_char remote_seq; /* sequence number the remote sent */
126 u_char local_seq; /* last sequence number we sent */
127 u_char protoID; /* 9 for group of 4, 8 otherwise */
128 u_long seq_retries; /* sent this how many time so far */
129 struct callout_handle handle; /* see timeout(9) */
134 hook_p lmi_channel; /* whatever we ended up using */
138 hook_p lmi_channel0; /* auto-detect on DLCI 0 */
139 hook_p lmi_channel1023;/* auto-detect on DLCI 1023 */
140 char *protoname; /* cache protocol name */
141 u_char dlci_state[MAXDLCI + 1];
142 int invalidx; /* next dlci's to invalidate */
144 typedef struct nglmi_softc *sc_p;
147 * Other internal functions
149 static void LMI_ticker(void *arg);
150 static void nglmi_startup_fixed(sc_p sc, hook_p hook);
151 static void nglmi_startup_auto(sc_p sc);
152 static void nglmi_startup(sc_p sc);
153 static void nglmi_inquire(sc_p sc, int full);
154 static void ngauto_state_machine(sc_p sc);
157 * Values for 'flags' field
158 * NB: the SCF_CONNECTED flag is set if and only if the timer is running.
160 #define SCF_CONNECTED 0x01 /* connected to something */
161 #define SCF_AUTO 0x02 /* we are auto-detecting */
162 #define SCF_FIXED 0x04 /* we are fixed from the start */
164 #define SCF_LMITYPE 0x18 /* mask for determining Annex mode */
165 #define SCF_NOLMI 0x00 /* no LMI type selected yet */
166 #define SCF_ANNEX_A 0x08 /* running annex A mode */
167 #define SCF_ANNEX_D 0x10 /* running annex D mode */
168 #define SCF_GROUP4 0x18 /* running group of 4 */
170 #define SETLMITYPE(sc, annex) \
172 (sc)->flags &= ~SCF_LMITYPE; \
173 (sc)->flags |= (annex); \
176 #define NOPROTO(sc) (((sc)->flags & SCF_LMITYPE) == SCF_NOLMI)
177 #define ANNEXA(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_A)
178 #define ANNEXD(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_D)
179 #define GROUP4(sc) (((sc)->flags & SCF_LMITYPE) == SCF_GROUP4)
181 #define LMIPOLLSIZE 3
182 #define LMI_PATIENCE 8 /* declare all DLCI DOWN after N LMI failures */
188 nglmi_constructor(node_p *nodep)
193 MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT);
196 bzero(sc, sizeof(*sc));
198 callout_handle_init(&sc->handle);
199 if ((error = ng_make_node_common(&typestruct, nodep))) {
200 FREE(sc, M_NETGRAPH);
203 (*nodep)->private = sc;
204 sc->protoname = NAME_NONE;
206 sc->liv_per_full = NG_LMI_SEQ_PER_FULL; /* make this dynamic */
207 sc->liv_rate = NG_LMI_KEEPALIVE_RATE;
212 * The LMI channel has a private pointer which is the same as the
213 * node private pointer. The debug channel has a NULL private pointer.
216 nglmi_newhook(node_p node, hook_p hook, const char *name)
218 sc_p sc = node->private;
220 if (strcmp(name, NG_LMI_HOOK_DEBUG) == 0) {
221 hook->private = NULL;
224 if (sc->flags & SCF_CONNECTED) {
225 /* already connected, return an error */
228 if (strcmp(name, NG_LMI_HOOK_ANNEXA) == 0) {
229 sc->lmi_annexA = hook;
230 hook->private = node->private;
232 SETLMITYPE(sc, SCF_ANNEX_A);
233 sc->protoname = NAME_ANNEXA;
234 nglmi_startup_fixed(sc, hook);
235 } else if (strcmp(name, NG_LMI_HOOK_ANNEXD) == 0) {
236 sc->lmi_annexD = hook;
237 hook->private = node->private;
239 SETLMITYPE(sc, SCF_ANNEX_D);
240 sc->protoname = NAME_ANNEXD;
241 nglmi_startup_fixed(sc, hook);
242 } else if (strcmp(name, NG_LMI_HOOK_GROUPOF4) == 0) {
243 sc->lmi_group4 = hook;
244 hook->private = node->private;
246 SETLMITYPE(sc, SCF_GROUP4);
247 sc->protoname = NAME_GROUP4;
248 nglmi_startup_fixed(sc, hook);
249 } else if (strcmp(name, NG_LMI_HOOK_AUTO0) == 0) {
250 /* Note this, and if B is already installed, we're complete */
251 sc->lmi_channel0 = hook;
252 sc->protoname = NAME_NONE;
253 hook->private = node->private;
254 if (sc->lmi_channel1023)
255 nglmi_startup_auto(sc);
256 } else if (strcmp(name, NG_LMI_HOOK_AUTO1023) == 0) {
257 /* Note this, and if A is already installed, we're complete */
258 sc->lmi_channel1023 = hook;
259 sc->protoname = NAME_NONE;
260 hook->private = node->private;
261 if (sc->lmi_channel0)
262 nglmi_startup_auto(sc);
264 return (EINVAL); /* unknown hook */
269 * We have just attached to a live (we hope) node.
270 * Fire out a LMI inquiry, and then start up the timers.
273 LMI_ticker(void *arg)
278 if (sc->flags & SCF_AUTO) {
279 ngauto_state_machine(sc);
280 sc->handle = timeout(LMI_ticker, sc, NG_LMI_POLL_RATE * hz);
282 if (sc->livs++ >= sc->liv_per_full) {
283 nglmi_inquire(sc, 1);
284 /* sc->livs = 0; *//* do this when we get the answer! */
286 nglmi_inquire(sc, 0);
288 sc->handle = timeout(LMI_ticker, sc, sc->liv_rate * hz);
294 nglmi_startup_fixed(sc_p sc, hook_p hook)
296 sc->flags |= (SCF_FIXED | SCF_CONNECTED);
297 sc->lmi_channel = hook;
302 nglmi_startup_auto(sc_p sc)
304 sc->flags |= (SCF_AUTO | SCF_CONNECTED);
305 sc->poll_state = 0; /* reset state machine */
311 nglmi_startup(sc_p sc)
316 sc->livs = sc->liv_per_full - 1;
317 /* start off the ticker in 1 sec */
318 sc->handle = timeout(LMI_ticker, sc, hz);
323 nglmi_inquire(sc_p sc, int full)
330 if (sc->lmi_channel == NULL)
332 MGETHDR(m, M_DONTWAIT, MT_DATA);
334 log(LOG_ERR, "nglmi: unable to start up LMI processing\n");
337 m->m_pkthdr.rcvif = NULL;
338 /* Allocate a meta struct (and leave some slop for options to be
339 * added by other modules). */
340 /* MALLOC(meta, meta_p, sizeof( struct ng_meta) + META_PAD,
341 * M_NETGRAPH, M_NOWAIT); */
342 MALLOC(meta, meta_p, sizeof(*meta) + META_PAD, M_NETGRAPH, M_NOWAIT);
343 if (meta != NULL) { /* if it failed, well, it was optional anyhow */
344 meta->used_len = (u_short) sizeof(struct ng_meta);
346 = (u_short) sizeof(struct ng_meta) + META_PAD;
348 meta->priority = NG_LMI_LMI_PRIORITY;
349 meta->discardability = -1;
351 m->m_data += 4; /* leave some room for a header */
352 cptr = start = mtod(m, char *);
353 /* add in the header for an LMI inquiry. */
354 *cptr++ = 0x03; /* UI frame */
356 *cptr++ = 0x09; /* proto discriminator */
358 *cptr++ = 0x08; /* proto discriminator */
359 *cptr++ = 0x00; /* call reference */
360 *cptr++ = 0x75; /* inquiry */
362 /* If we are Annex-D, there is this extra thing.. */
364 *cptr++ = 0x95; /* ??? */
365 /* Add a request type */
367 *cptr++ = 0x51; /* report type */
369 *cptr++ = 0x01; /* report type */
370 *cptr++ = 0x01; /* size = 1 */
372 *cptr++ = 0x00; /* full */
374 *cptr++ = 0x01; /* partial */
376 /* Add a link verification IE */
378 *cptr++ = 0x53; /* verification IE */
380 *cptr++ = 0x03; /* verification IE */
381 *cptr++ = 0x02; /* 2 extra bytes */
382 *cptr++ = sc->local_seq;
383 *cptr++ = sc->remote_seq;
387 m->m_len = m->m_pkthdr.len = cptr - start;
388 NG_SEND_DATA(error, sc->lmi_channel, m, meta);
390 /* If we've been sending requests for long enough, and there has
391 * been no response, then mark as DOWN, any DLCIs that are UP. */
392 if (sc->seq_retries == LMI_PATIENCE) {
395 for (count = 0; count < MAXDLCI; count++)
396 if (sc->dlci_state[count] == DLCI_UP)
397 sc->dlci_state[count] = DLCI_DOWN;
402 * State machine for LMI auto-detect. The transitions are ordered
403 * to try the more likely possibilities first.
406 ngauto_state_machine(sc_p sc)
408 if ((sc->poll_count <= 0) || (sc->poll_count > LMIPOLLSIZE)) {
409 /* time to change states in the auto probe machine */
410 /* capture wild values of poll_count while we are at it */
411 sc->poll_count = LMIPOLLSIZE;
414 switch (sc->poll_state) {
416 log(LOG_WARNING, "nglmi: no response from exchange\n");
417 default: /* capture bad states */
420 sc->lmi_channel = sc->lmi_channel0;
421 SETLMITYPE(sc, SCF_ANNEX_D);
424 sc->lmi_channel = sc->lmi_channel1023;
425 SETLMITYPE(sc, SCF_ANNEX_D);
428 sc->lmi_channel = sc->lmi_channel0;
429 SETLMITYPE(sc, SCF_ANNEX_A);
432 sc->lmi_channel = sc->lmi_channel1023;
433 SETLMITYPE(sc, SCF_GROUP4);
436 sc->lmi_channel = sc->lmi_channel1023;
437 SETLMITYPE(sc, SCF_ANNEX_A);
440 sc->lmi_channel = sc->lmi_channel0;
441 SETLMITYPE(sc, SCF_GROUP4);
445 /* send an inquirey encoded appropriatly */
446 nglmi_inquire(sc, 0);
451 * Receive a netgraph control message.
454 nglmi_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
455 struct ng_mesg **resp)
458 sc_p sc = node->private;
460 switch (msg->header.typecookie) {
461 case NGM_GENERIC_COOKIE:
462 switch (msg->header.cmd) {
463 case NGM_TEXT_STATUS:
468 NG_MKRESPONSE(*resp, msg, NG_TEXTRESPONSE, M_NOWAIT);
474 pos = sprintf(arg, "protocol %s ", sc->protoname);
475 if (sc->flags & SCF_FIXED)
476 pos += sprintf(arg + pos, "fixed\n");
477 else if (sc->flags & SCF_AUTO)
478 pos += sprintf(arg + pos, "auto-detecting\n");
480 pos += sprintf(arg + pos, "auto on dlci %d\n",
481 (sc->lmi_channel == sc->lmi_channel0) ?
483 pos += sprintf(arg + pos,
484 "keepalive period: %d seconds\n", sc->liv_rate);
485 pos += sprintf(arg + pos,
486 "unacknowledged keepalives: %ld\n",
490 && (pos < (NG_TEXTRESPONSE - 20)));
492 if (sc->dlci_state[count]) {
493 pos += sprintf(arg + pos,
494 "dlci %d %s\n", count,
495 (sc->dlci_state[count]
496 == DLCI_UP) ? "up" : "down");
499 (*resp)->header.arglen = pos + 1;
508 switch (msg->header.cmd) {
509 case NGM_LMI_GET_STATUS:
511 struct nglmistat *stat;
514 NG_MKRESPONSE(*resp, msg, sizeof(*stat), M_NOWAIT);
519 stat = (struct nglmistat *) (*resp)->data;
521 sc->protoname, sizeof(stat->proto) - 1);
523 sc->protoname, sizeof(stat->hook) - 1);
524 stat->autod = !!(sc->flags & SCF_AUTO);
525 stat->fixed = !!(sc->flags & SCF_FIXED);
526 for (k = 0; k <= MAXDLCI; k++) {
527 switch (sc->dlci_state[k]) {
529 stat->up[k / 8] |= (1 << (k % 8));
532 stat->seen[k / 8] |= (1 << (k % 8));
547 FREE(msg, M_NETGRAPH);
551 #define STEPBY(stepsize) \
553 packetlen -= (stepsize); \
554 data += (stepsize); \
558 * receive data, and use it to update our status.
559 * Anything coming in on the debug port is discarded.
562 nglmi_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
564 sc_p sc = hook->node->private;
568 int resptype_seen = 0;
571 if (hook->private == NULL) {
574 packetlen = m->m_hdr.mh_len;
576 /* XXX what if it's more than 1 mbuf? */
577 if ((packetlen > MHLEN) && !(m->m_flags & M_EXT)) {
578 log(LOG_WARNING, "nglmi: packetlen (%d) too big\n", packetlen);
581 if (m->m_len < packetlen && (m = m_pullup(m, packetlen)) == NULL) {
583 "nglmi: m_pullup failed for %d bytes\n", packetlen);
587 if (nglmi_checkdata(hook, m, meta) == 0)
590 /* pass the first 4 bytes (already checked in the nglmi_checkdata()) */
591 data = mtod(m, const u_char *);
594 /* Now check if there is a 'locking shift'. This is only seen in
595 * Annex D frames. don't bother checking, we already did that. Don't
596 * increment immediatly as it might not be there. */
600 /* If we get this far we should consider that it is a legitimate
601 * frame and we know what it is. */
602 if (sc->flags & SCF_AUTO) {
603 /* note the hook that this valid channel came from and drop
604 * out of auto probe mode. */
606 sc->protoname = NAME_ANNEXA;
608 sc->protoname = NAME_ANNEXD;
610 sc->protoname = NAME_GROUP4;
612 log(LOG_ERR, "nglmi: No known type\n");
615 sc->lmi_channel = hook;
616 sc->flags &= ~SCF_AUTO;
617 log(LOG_INFO, "nglmi: auto-detected %s LMI on DLCI %d\n",
618 sc->protoname, hook == sc->lmi_channel0 ? 0 : 1023);
621 /* While there is more data in the status packet, keep processing
622 * status items. First make sure there is enough data for the
623 * segment descriptor's length field. */
624 while (packetlen >= 2) {
625 u_int segtype = data[0];
626 u_int segsize = data[1];
628 /* Now that we know how long it claims to be, make sure
629 * there is enough data for the next seg. */
630 if (packetlen < segsize + 2)
636 log(LOG_WARNING, "nglmi: dup MSGTYPE\n");
640 /* The remote end tells us what kind of response
641 * this is. Only expect a type 0 or 1. if we are a
642 * full status, invalidate a few DLCIs just to see
643 * that they are still ok. */
648 /* partial status, do no extra processing */
653 int idx = sc->invalidx;
655 for (count = 0; count < 10; count++) {
658 if (sc->dlci_state[idx] == DLCI_UP)
659 sc->dlci_state[idx] = DLCI_DOWN;
663 /* we got and we wanted one. relax
664 * now.. but don't reset to 0 if it
665 * was unrequested. */
666 if (sc->livs > sc->liv_per_full)
674 /* The remote tells us what it thinks the sequence
675 * numbers are. If it's not size 2, it must be a
676 * duplicate to have gotten this far, skip it. */
677 if (seq_seen != 0) /* already seen seq numbers */
681 sc->remote_seq = data[2];
682 if (sc->local_seq == data[3]) {
685 /* Note that all 3 Frame protocols seem to
686 * not like 0 as a sequence number. */
687 if (sc->local_seq == 0)
693 /* The remote tells us about a DLCI that it knows
694 * about. There may be many of these in a single
697 case 6:/* only on 'group of 4' */
698 dlci = ((u_short) data[2] & 0xff) << 8;
699 dlci |= (data[3] & 0xff);
700 if ((dlci < 1024) && (dlci > 0)) {
705 dlci = ((u_short) data[2] & 0x3f) << 4;
706 dlci |= ((data[3] & 0x78) >> 3);
707 if ((dlci < 1024) && (dlci > 0)) {
708 /* set up the bottom half of the
709 * support for that dlci if it's not
710 * already been done */
711 /* store this information somewhere */
717 if (sc->dlci_state[dlci] != DLCI_UP) {
718 /* bring new DLCI to life */
719 /* may do more here some day */
720 if (sc->dlci_state[dlci] != DLCI_DOWN)
722 "nglmi: DLCI %d became active\n",
724 sc->dlci_state[dlci] = DLCI_UP;
731 NG_FREE_DATA(m, meta);
735 NG_FREE_DATA(m, meta);
740 * Check that a packet is entirely kosha.
741 * return 1 of ok, and 0 if not.
742 * All data is discarded if a 0 is returned.
745 nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta)
747 sc_p sc = hook->node->private;
754 int resptype_seen = 0; /* 0 , 1 (partial) or 2 (full) */
755 int highest_dlci = 0;
757 packetlen = m->m_hdr.mh_len;
758 data = mtod(m, const u_char *);
760 log(LOG_WARNING, "nglmi: unexpected value in LMI(%d)\n", 1);
765 /* look at the protocol ID */
767 if (sc->flags & SCF_AUTO) {
768 SETLMITYPE(sc, SCF_NOLMI); /* start with a clean slate */
774 SETLMITYPE(sc, SCF_GROUP4);
778 log(LOG_WARNING, "nglmi: bad Protocol ID(%d)\n",
783 if (nextbyte != sc->protoID) {
784 log(LOG_WARNING, "nglmi: unexpected Protocol ID(%d)\n",
791 /* check call reference (always null in non ISDN frame relay) */
793 log(LOG_WARNING, "nglmi: unexpected Call Reference (0x%x)\n",
799 /* check message type */
800 switch ((type = *data)) {
801 case 0x75: /* Status enquiry */
802 log(LOG_WARNING, "nglmi: unexpected message type(0x%x)\n",
805 case 0x7D: /* Status message */
809 "nglmi: unexpected msg type(0x%x) \n", (int) type);
814 /* Now check if there is a 'locking shift'. This is only seen in
815 * Annex D frames. Don't increment immediately as it might not be
818 if (sc->flags & SCF_AUTO) {
820 if (nextbyte == 0x95) {
821 SETLMITYPE(sc, SCF_ANNEX_D);
824 SETLMITYPE(sc, SCF_ANNEX_A);
825 } else if (nextbyte == 0x95) {
826 log(LOG_WARNING, "nglmi: locking shift seen in G4\n");
835 "nglmi: locking shift missing\n");
838 } else if (*data == 0x95) {
839 log(LOG_WARNING, "nglmi: locking shift seen\n");
844 /* While there is more data in the status packet, keep processing
845 * status items. First make sure there is enough data for the
846 * segment descriptor's length field. */
847 while (packetlen >= 2) {
848 u_int segtype = data[0];
849 u_int segsize = data[1];
851 /* Now that we know how long it claims to be, make sure
852 * there is enough data for the next seg. */
853 if (packetlen < (segsize + 2)) {
854 log(LOG_WARNING, "nglmi: IE longer than packet\n");
860 /* According to MCI's HP analyser, we should just
861 * ignore if there is mor ethan one of these (?). */
863 log(LOG_WARNING, "nglmi: dup MSGTYPE\n");
867 log(LOG_WARNING, "nglmi: MSGTYPE wrong size\n");
870 /* The remote end tells us what kind of response
871 * this is. Only expect a type 0 or 1. if it was a
872 * full (type 0) check we just asked for a type
876 if (sc->livs > sc->liv_per_full) {
878 "nglmi: LIV when FULL expected\n");
879 goto reject; /* need full */
884 /* Full response is always acceptable */
889 "nglmi: Unknown report type %d\n", data[2]);
895 /* The remote tells us what it thinks the sequence
896 * numbers are. I would have thought that there
897 * needs to be one and only one of these, but MCI
898 * want us to just ignore extras. (?) */
899 if (resptype_seen == 0) {
900 log(LOG_WARNING, "nglmi: no TYPE before SEQ\n");
903 if (seq_seen != 0) /* already seen seq numbers */
906 log(LOG_WARNING, "nglmi: bad SEQ sts size\n");
909 if (sc->local_seq != data[3]) {
910 log(LOG_WARNING, "nglmi: unexpected SEQ\n");
917 /* The remote tells us about a DLCI that it knows
918 * about. There may be many of these in a single
920 if (seq_seen != 1) { /* already seen seq numbers? */
922 "nglmi: No sequence before DLCI\n");
925 if (resptype_seen != 2) { /* must be full */
927 "nglmi: No resp type before DLCI\n");
933 "nglmi: wrong IE segsize\n");
936 dlci = ((u_short) data[2] & 0xff) << 8;
937 dlci |= (data[3] & 0xff);
941 "nglmi: DLCI headersize of %d"
942 " not supported\n", segsize - 1);
945 dlci = ((u_short) data[2] & 0x3f) << 4;
946 dlci |= ((data[3] & 0x78) >> 3);
948 /* async can only have one of these */
949 #if 0 /* async not yet accepted */
950 if (async && highest_dlci) {
952 "nglmi: Async with > 1 DLCI\n");
956 /* Annex D says these will always be Ascending, but
957 * the HP test for G4 says we should accept
958 * duplicates, so for now allow that. ( <= vs. < ) */
960 /* MCI tests want us to accept out of order for AnxD */
961 if ((!GROUP4(sc)) && (dlci < highest_dlci)) {
962 /* duplicate or mis-ordered dlci */
963 /* (spec says they will increase in number) */
964 log(LOG_WARNING, "nglmi: DLCI out of order\n");
969 log(LOG_WARNING, "nglmi: DLCI out of range\n");
976 "nglmi: unknown LMI segment type %d\n", segtype);
981 if (packetlen != 0) { /* partial junk at end? */
983 "nglmi: %d bytes extra at end of packet\n", packetlen);
986 if (resptype_seen == 0) {
987 log(LOG_WARNING, "nglmi: No response type seen\n");
988 goto reject; /* had no response type */
991 log(LOG_WARNING, "nglmi: No sequence numbers seen\n");
992 goto reject; /* had no sequence numbers */
1001 const u_char *bp = mtod(m, const u_char *);
1004 loc = (m->m_hdr.mh_len - packetlen);
1005 log(LOG_WARNING, "nglmi: error at location %d\n", loc);
1006 while (k < m->m_hdr.mh_len) {
1009 while ((j++ < 16) && k < m->m_hdr.mh_len) {
1010 pos += sprintf(buf + pos, "%c%02x",
1011 ((loc == k) ? '>' : ' '),
1016 log(LOG_WARNING, "nglmi: packet data:%s\n", buf);
1018 log(LOG_WARNING, "%04d :%s\n", k, buf);
1028 const u_char *bp = mtod(m, const u_char *);
1031 loc = (m->m_hdr.mh_len - packetlen);
1032 log(LOG_WARNING, "nglmi: error at location %d\n", loc);
1033 while (k < m->m_hdr.mh_len) {
1036 while ((j++ < 16) && k < m->m_hdr.mh_len) {
1037 pos += sprintf(buf + pos, "%c%02x",
1038 ((loc == k) ? '>' : ' '),
1043 log(LOG_WARNING, "nglmi: packet data:%s\n", buf);
1045 log(LOG_WARNING, "%04d :%s\n", k, buf);
1049 NG_FREE_DATA(m, meta);
1054 * Do local shutdown processing..
1055 * Cut any remaining links and free our local resources.
1058 nglmi_rmnode(node_p node)
1060 const sc_p sc = node->private;
1062 node->flags |= NG_INVALID;
1065 node->private = NULL;
1067 FREE(sc, M_NETGRAPH);
1072 * Hook disconnection
1073 * For this type, removal of any link except "debug" destroys the node.
1076 nglmi_disconnect(hook_p hook)
1078 const sc_p sc = hook->node->private;
1080 /* OK to remove debug hook(s) */
1081 if (hook->private == NULL)
1084 /* Stop timer if it's currently active */
1085 if (sc->flags & SCF_CONNECTED)
1086 untimeout(LMI_ticker, sc, sc->handle);
1089 ng_rmnode(hook->node);