1 // SPDX-License-Identifier: GPL-2.0-only
4 * Author Karsten Keil <kkeil@novell.com>
6 * Copyright 2008 by Karsten Keil <kkeil@novell.com>
9 #include <linux/mISDNif.h>
10 #include <linux/slab.h>
18 struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL};
20 static char *strL2State[] =
44 EV_L2_DL_ESTABLISH_REQ,
59 #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1)
61 static char *strL2Event[] =
74 "EV_L2_DL_ESTABLISH_REQ",
75 "EV_L2_DL_RELEASE_REQ",
85 "EV_L2_CLEAR_OWN_BUSY",
90 l2m_debug(struct FsmInst *fi, char *fmt, ...)
92 struct layer2 *l2 = fi->userdata;
96 if (!(*debug & DEBUG_L2_FSM))
104 printk(KERN_DEBUG "%s l2 (sapi %d tei %d): %pV\n",
105 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, &vaf);
111 l2headersize(struct layer2 *l2, int ui)
113 return ((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
114 (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
118 l2addrsize(struct layer2 *l2)
120 return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1;
124 l2_newid(struct layer2 *l2)
138 l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb)
144 mISDN_HEAD_PRIM(skb) = prim;
145 mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr;
146 err = l2->up->send(l2->up, skb);
148 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
149 mISDNDevName4ch(&l2->ch), err);
155 l2up_create(struct layer2 *l2, u_int prim, int len, void *arg)
158 struct mISDNhead *hh;
163 skb = mI_alloc_skb(len, GFP_ATOMIC);
166 hh = mISDN_HEAD_P(skb);
168 hh->id = (l2->ch.nr << 16) | l2->ch.addr;
170 skb_put_data(skb, arg, len);
171 err = l2->up->send(l2->up, skb);
173 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
174 mISDNDevName4ch(&l2->ch), err);
180 l2down_skb(struct layer2 *l2, struct sk_buff *skb) {
183 ret = l2->ch.recv(l2->ch.peer, skb);
184 if (ret && (*debug & DEBUG_L2_RECV))
185 printk(KERN_DEBUG "l2down_skb: dev %s ret(%d)\n",
186 mISDNDevName4ch(&l2->ch), ret);
191 l2down_raw(struct layer2 *l2, struct sk_buff *skb)
193 struct mISDNhead *hh = mISDN_HEAD_P(skb);
195 if (hh->prim == PH_DATA_REQ) {
196 if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
197 skb_queue_tail(&l2->down_queue, skb);
200 l2->down_id = mISDN_HEAD_ID(skb);
202 return l2down_skb(l2, skb);
206 l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb)
208 struct mISDNhead *hh = mISDN_HEAD_P(skb);
212 return l2down_raw(l2, skb);
216 l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg)
220 struct mISDNhead *hh;
222 skb = mI_alloc_skb(len, GFP_ATOMIC);
225 hh = mISDN_HEAD_P(skb);
229 skb_put_data(skb, arg, len);
230 err = l2down_raw(l2, skb);
237 ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) {
238 struct sk_buff *nskb = skb;
241 if (test_bit(FLG_L1_NOTREADY, &l2->flag)) {
242 if (hh->id == l2->down_id) {
243 nskb = skb_dequeue(&l2->down_queue);
245 l2->down_id = mISDN_HEAD_ID(nskb);
246 if (l2down_skb(l2, nskb)) {
248 l2->down_id = MISDN_ID_NONE;
251 l2->down_id = MISDN_ID_NONE;
256 if (l2->down_id == MISDN_ID_NONE) {
257 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
258 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
262 if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
263 nskb = skb_dequeue(&l2->down_queue);
265 l2->down_id = mISDN_HEAD_ID(nskb);
266 if (l2down_skb(l2, nskb)) {
268 l2->down_id = MISDN_ID_NONE;
269 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
272 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
278 l2_timeout(struct FsmInst *fi, int event, void *arg)
280 struct layer2 *l2 = fi->userdata;
282 struct mISDNhead *hh;
284 skb = mI_alloc_skb(0, GFP_ATOMIC);
286 printk(KERN_WARNING "%s: L2(%d,%d) nr:%x timer %s no skb\n",
287 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
288 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
291 hh = mISDN_HEAD_P(skb);
292 hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND;
294 if (*debug & DEBUG_TIMER)
295 printk(KERN_DEBUG "%s: L2(%d,%d) nr:%x timer %s expired\n",
296 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
297 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
299 l2->ch.st->own.recv(&l2->ch.st->own, skb);
303 l2mgr(struct layer2 *l2, u_int prim, void *arg) {
306 printk(KERN_WARNING "l2mgr: dev %s addr:%x prim %x %c\n",
307 mISDNDevName4ch(&l2->ch), l2->id, prim, (char)c);
308 if (test_bit(FLG_LAPD, &l2->flag) &&
309 !test_bit(FLG_FIXED_TEI, &l2->flag)) {
315 l2_tei(l2, prim, (u_long)arg);
323 set_peer_busy(struct layer2 *l2) {
324 test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
325 if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
326 test_and_set_bit(FLG_L2BLOCK, &l2->flag);
330 clear_peer_busy(struct layer2 *l2) {
331 if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
332 test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
336 InitWin(struct layer2 *l2)
340 for (i = 0; i < MAX_WINDOW; i++)
341 l2->windowar[i] = NULL;
345 freewin(struct layer2 *l2)
349 for (i = 0; i < MAX_WINDOW; i++) {
350 if (l2->windowar[i]) {
352 dev_kfree_skb(l2->windowar[i]);
353 l2->windowar[i] = NULL;
360 ReleaseWin(struct layer2 *l2)
362 int cnt = freewin(l2);
366 "isdnl2 freed %d skbuffs in release\n", cnt);
370 cansend(struct layer2 *l2)
374 if (test_bit(FLG_MOD128, &l2->flag))
375 p1 = (l2->vs - l2->va) % 128;
377 p1 = (l2->vs - l2->va) % 8;
378 return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &l2->flag);
382 clear_exception(struct layer2 *l2)
384 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
385 test_and_clear_bit(FLG_REJEXC, &l2->flag);
386 test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
391 sethdraddr(struct layer2 *l2, u_char *header, int rsp)
393 u_char *ptr = header;
396 if (test_bit(FLG_LAPD, &l2->flag)) {
397 if (test_bit(FLG_LAPD_NET, &l2->flag))
399 *ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0);
400 *ptr++ = (l2->tei << 1) | 1;
403 if (test_bit(FLG_ORIG, &l2->flag))
414 enqueue_super(struct layer2 *l2, struct sk_buff *skb)
416 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
421 enqueue_ui(struct layer2 *l2, struct sk_buff *skb)
424 l2_tei(l2, MDL_STATUS_UI_IND, 0);
425 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
432 return (data[0] & 0xef) == UI;
438 return (data[0] & 0xef) == UA;
444 return (data[0] & 0xef) == DM;
450 return (data[0] & 0xef) == DISC;
454 IsRR(u_char *data, struct layer2 *l2)
456 if (test_bit(FLG_MOD128, &l2->flag))
457 return data[0] == RR;
459 return (data[0] & 0xf) == 1;
463 IsSFrame(u_char *data, struct layer2 *l2)
465 register u_char d = *data;
467 if (!test_bit(FLG_MOD128, &l2->flag))
469 return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c);
473 IsSABME(u_char *data, struct layer2 *l2)
475 u_char d = data[0] & ~0x10;
477 return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM;
481 IsREJ(u_char *data, struct layer2 *l2)
483 return test_bit(FLG_MOD128, &l2->flag) ?
484 data[0] == REJ : (data[0] & 0xf) == REJ;
490 return (data[0] & 0xef) == FRMR;
494 IsRNR(u_char *data, struct layer2 *l2)
496 return test_bit(FLG_MOD128, &l2->flag) ?
497 data[0] == RNR : (data[0] & 0xf) == RNR;
501 iframe_error(struct layer2 *l2, struct sk_buff *skb)
504 int rsp = *skb->data & 0x2;
506 i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1);
507 if (test_bit(FLG_ORIG, &l2->flag))
513 if ((skb->len - i) > l2->maxlen)
519 super_error(struct layer2 *l2, struct sk_buff *skb)
521 if (skb->len != l2addrsize(l2) +
522 (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1))
528 unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp)
530 int rsp = (*skb->data & 0x2) >> 1;
531 if (test_bit(FLG_ORIG, &l2->flag))
535 if (skb->len != l2addrsize(l2) + 1)
541 UI_error(struct layer2 *l2, struct sk_buff *skb)
543 int rsp = *skb->data & 0x2;
544 if (test_bit(FLG_ORIG, &l2->flag))
548 if (skb->len > l2->maxlen + l2addrsize(l2) + 1)
554 FRMR_error(struct layer2 *l2, struct sk_buff *skb)
556 u_int headers = l2addrsize(l2) + 1;
557 u_char *datap = skb->data + headers;
558 int rsp = *skb->data & 0x2;
560 if (test_bit(FLG_ORIG, &l2->flag))
564 if (test_bit(FLG_MOD128, &l2->flag)) {
565 if (skb->len < headers + 5)
567 else if (*debug & DEBUG_L2)
569 "FRMR information %2x %2x %2x %2x %2x",
570 datap[0], datap[1], datap[2], datap[3], datap[4]);
572 if (skb->len < headers + 3)
574 else if (*debug & DEBUG_L2)
576 "FRMR information %2x %2x %2x",
577 datap[0], datap[1], datap[2]);
583 legalnr(struct layer2 *l2, unsigned int nr)
585 if (test_bit(FLG_MOD128, &l2->flag))
586 return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
588 return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
592 setva(struct layer2 *l2, unsigned int nr)
596 while (l2->va != nr) {
598 if (test_bit(FLG_MOD128, &l2->flag))
602 if (l2->windowar[l2->sow]) {
603 skb_trim(l2->windowar[l2->sow], 0);
604 skb_queue_tail(&l2->tmp_queue, l2->windowar[l2->sow]);
605 l2->windowar[l2->sow] = NULL;
607 l2->sow = (l2->sow + 1) % l2->window;
609 skb = skb_dequeue(&l2->tmp_queue);
612 skb = skb_dequeue(&l2->tmp_queue);
617 send_uframe(struct layer2 *l2, struct sk_buff *skb, u_char cmd, u_char cr)
619 u_char tmp[MAX_L2HEADER_LEN];
622 i = sethdraddr(l2, tmp, cr);
627 skb = mI_alloc_skb(i, GFP_ATOMIC);
629 printk(KERN_WARNING "%s: can't alloc skbuff in %s\n",
630 mISDNDevName4ch(&l2->ch), __func__);
634 skb_put_data(skb, tmp, i);
635 enqueue_super(l2, skb);
640 get_PollFlag(struct layer2 *l2, struct sk_buff *skb)
642 return skb->data[l2addrsize(l2)] & 0x10;
646 get_PollFlagFree(struct layer2 *l2, struct sk_buff *skb)
650 PF = get_PollFlag(l2, skb);
656 start_t200(struct layer2 *l2, int i)
658 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
659 test_and_set_bit(FLG_T200_RUN, &l2->flag);
663 restart_t200(struct layer2 *l2, int i)
665 mISDN_FsmRestartTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
666 test_and_set_bit(FLG_T200_RUN, &l2->flag);
670 stop_t200(struct layer2 *l2, int i)
672 if (test_and_clear_bit(FLG_T200_RUN, &l2->flag))
673 mISDN_FsmDelTimer(&l2->t200, i);
677 st5_dl_release_l2l3(struct layer2 *l2)
681 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
685 l2up_create(l2, pr, 0, NULL);
689 lapb_dl_release_l2l3(struct layer2 *l2, int f)
691 if (test_bit(FLG_LAPB, &l2->flag))
692 l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL);
693 l2up_create(l2, f, 0, NULL);
697 establishlink(struct FsmInst *fi)
699 struct layer2 *l2 = fi->userdata;
704 cmd = (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10;
705 send_uframe(l2, NULL, cmd, CMD);
706 mISDN_FsmDelTimer(&l2->t203, 1);
708 test_and_clear_bit(FLG_PEND_REL, &l2->flag);
710 mISDN_FsmChangeState(fi, ST_L2_5);
714 l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
716 struct sk_buff *skb = arg;
717 struct layer2 *l2 = fi->userdata;
719 if (get_PollFlagFree(l2, skb))
720 l2mgr(l2, MDL_ERROR_IND, (void *) 'C');
722 l2mgr(l2, MDL_ERROR_IND, (void *) 'D');
727 l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
729 struct sk_buff *skb = arg;
730 struct layer2 *l2 = fi->userdata;
732 if (get_PollFlagFree(l2, skb))
733 l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
735 l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
737 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
742 l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
744 struct sk_buff *skb = arg;
745 struct layer2 *l2 = fi->userdata;
747 if (get_PollFlagFree(l2, skb))
748 l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
750 l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
752 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
756 l2_go_st3(struct FsmInst *fi, int event, void *arg)
758 dev_kfree_skb((struct sk_buff *)arg);
759 mISDN_FsmChangeState(fi, ST_L2_3);
763 l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
765 struct layer2 *l2 = fi->userdata;
767 mISDN_FsmChangeState(fi, ST_L2_3);
768 dev_kfree_skb((struct sk_buff *)arg);
769 l2_tei(l2, MDL_ASSIGN_IND, 0);
773 l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
775 struct layer2 *l2 = fi->userdata;
776 struct sk_buff *skb = arg;
778 skb_queue_tail(&l2->ui_queue, skb);
779 mISDN_FsmChangeState(fi, ST_L2_2);
780 l2_tei(l2, MDL_ASSIGN_IND, 0);
784 l2_queue_ui(struct FsmInst *fi, int event, void *arg)
786 struct layer2 *l2 = fi->userdata;
787 struct sk_buff *skb = arg;
789 skb_queue_tail(&l2->ui_queue, skb);
793 tx_ui(struct layer2 *l2)
796 u_char header[MAX_L2HEADER_LEN];
799 i = sethdraddr(l2, header, CMD);
800 if (test_bit(FLG_LAPD_NET, &l2->flag))
801 header[1] = 0xff; /* tei 127 */
803 while ((skb = skb_dequeue(&l2->ui_queue))) {
804 memcpy(skb_push(skb, i), header, i);
810 l2_send_ui(struct FsmInst *fi, int event, void *arg)
812 struct layer2 *l2 = fi->userdata;
813 struct sk_buff *skb = arg;
815 skb_queue_tail(&l2->ui_queue, skb);
820 l2_got_ui(struct FsmInst *fi, int event, void *arg)
822 struct layer2 *l2 = fi->userdata;
823 struct sk_buff *skb = arg;
825 skb_pull(skb, l2headersize(l2, 1));
827 * in states 1-3 for broadcast
831 l2_tei(l2, MDL_STATUS_UI_IND, 0);
832 l2up(l2, DL_UNITDATA_IND, skb);
836 l2_establish(struct FsmInst *fi, int event, void *arg)
838 struct sk_buff *skb = arg;
839 struct layer2 *l2 = fi->userdata;
842 test_and_set_bit(FLG_L3_INIT, &l2->flag);
847 l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
849 struct sk_buff *skb = arg;
850 struct layer2 *l2 = fi->userdata;
852 skb_queue_purge(&l2->i_queue);
853 test_and_set_bit(FLG_L3_INIT, &l2->flag);
854 test_and_clear_bit(FLG_PEND_REL, &l2->flag);
859 l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
861 struct sk_buff *skb = arg;
862 struct layer2 *l2 = fi->userdata;
864 skb_queue_purge(&l2->i_queue);
866 test_and_set_bit(FLG_L3_INIT, &l2->flag);
871 l2_release(struct FsmInst *fi, int event, void *arg)
873 struct layer2 *l2 = fi->userdata;
874 struct sk_buff *skb = arg;
877 l2up(l2, DL_RELEASE_CNF, skb);
881 l2_pend_rel(struct FsmInst *fi, int event, void *arg)
883 struct sk_buff *skb = arg;
884 struct layer2 *l2 = fi->userdata;
886 test_and_set_bit(FLG_PEND_REL, &l2->flag);
891 l2_disconnect(struct FsmInst *fi, int event, void *arg)
893 struct layer2 *l2 = fi->userdata;
894 struct sk_buff *skb = arg;
896 skb_queue_purge(&l2->i_queue);
898 mISDN_FsmChangeState(fi, ST_L2_6);
900 send_uframe(l2, NULL, DISC | 0x10, CMD);
901 mISDN_FsmDelTimer(&l2->t203, 1);
908 l2_start_multi(struct FsmInst *fi, int event, void *arg)
910 struct layer2 *l2 = fi->userdata;
911 struct sk_buff *skb = arg;
918 send_uframe(l2, NULL, UA | get_PollFlag(l2, skb), RSP);
919 mISDN_FsmChangeState(fi, ST_L2_7);
920 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
922 l2up(l2, DL_ESTABLISH_IND, skb);
924 l2_tei(l2, MDL_STATUS_UP_IND, 0);
928 l2_send_UA(struct FsmInst *fi, int event, void *arg)
930 struct layer2 *l2 = fi->userdata;
931 struct sk_buff *skb = arg;
933 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
937 l2_send_DM(struct FsmInst *fi, int event, void *arg)
939 struct layer2 *l2 = fi->userdata;
940 struct sk_buff *skb = arg;
942 send_uframe(l2, skb, DM | get_PollFlag(l2, skb), RSP);
946 l2_restart_multi(struct FsmInst *fi, int event, void *arg)
948 struct layer2 *l2 = fi->userdata;
949 struct sk_buff *skb = arg;
952 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
954 l2mgr(l2, MDL_ERROR_IND, (void *) 'F');
956 if (l2->vs != l2->va) {
957 skb_queue_purge(&l2->i_queue);
966 mISDN_FsmChangeState(fi, ST_L2_7);
968 mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
971 l2up_create(l2, DL_ESTABLISH_IND, 0, NULL);
972 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
973 * MGR_SHORTSTATUS | INDICATION, SSTATUS_L2_ESTABLISHED,
976 if (skb_queue_len(&l2->i_queue) && cansend(l2))
977 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
981 l2_stop_multi(struct FsmInst *fi, int event, void *arg)
983 struct layer2 *l2 = fi->userdata;
984 struct sk_buff *skb = arg;
986 mISDN_FsmChangeState(fi, ST_L2_4);
987 mISDN_FsmDelTimer(&l2->t203, 3);
990 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
991 skb_queue_purge(&l2->i_queue);
993 lapb_dl_release_l2l3(l2, DL_RELEASE_IND);
995 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
999 l2_connected(struct FsmInst *fi, int event, void *arg)
1001 struct layer2 *l2 = fi->userdata;
1002 struct sk_buff *skb = arg;
1005 if (!get_PollFlag(l2, skb)) {
1006 l2_mdl_error_ua(fi, event, arg);
1010 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
1011 l2_disconnect(fi, event, NULL);
1012 if (test_and_clear_bit(FLG_L3_INIT, &l2->flag)) {
1013 pr = DL_ESTABLISH_CNF;
1014 } else if (l2->vs != l2->va) {
1015 skb_queue_purge(&l2->i_queue);
1016 pr = DL_ESTABLISH_IND;
1023 mISDN_FsmChangeState(fi, ST_L2_7);
1024 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 4);
1026 l2up_create(l2, pr, 0, NULL);
1028 if (skb_queue_len(&l2->i_queue) && cansend(l2))
1029 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1032 l2_tei(l2, MDL_STATUS_UP_IND, 0);
1036 l2_released(struct FsmInst *fi, int event, void *arg)
1038 struct layer2 *l2 = fi->userdata;
1039 struct sk_buff *skb = arg;
1041 if (!get_PollFlag(l2, skb)) {
1042 l2_mdl_error_ua(fi, event, arg);
1047 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1048 mISDN_FsmChangeState(fi, ST_L2_4);
1050 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1054 l2_reestablish(struct FsmInst *fi, int event, void *arg)
1056 struct layer2 *l2 = fi->userdata;
1057 struct sk_buff *skb = arg;
1059 if (!get_PollFlagFree(l2, skb)) {
1061 test_and_set_bit(FLG_L3_INIT, &l2->flag);
1066 l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
1068 struct layer2 *l2 = fi->userdata;
1069 struct sk_buff *skb = arg;
1071 if (get_PollFlagFree(l2, skb)) {
1073 if (!test_bit(FLG_L3_INIT, &l2->flag))
1074 skb_queue_purge(&l2->i_queue);
1075 if (test_bit(FLG_LAPB, &l2->flag))
1076 l2down_create(l2, PH_DEACTIVATE_REQ,
1077 l2_newid(l2), 0, NULL);
1078 st5_dl_release_l2l3(l2);
1079 mISDN_FsmChangeState(fi, ST_L2_4);
1081 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1086 l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
1088 struct layer2 *l2 = fi->userdata;
1089 struct sk_buff *skb = arg;
1091 if (get_PollFlagFree(l2, skb)) {
1093 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1094 mISDN_FsmChangeState(fi, ST_L2_4);
1096 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1101 enquiry_cr(struct layer2 *l2, u_char typ, u_char cr, u_char pf)
1103 struct sk_buff *skb;
1104 u_char tmp[MAX_L2HEADER_LEN];
1107 i = sethdraddr(l2, tmp, cr);
1108 if (test_bit(FLG_MOD128, &l2->flag)) {
1110 tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
1112 tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
1113 skb = mI_alloc_skb(i, GFP_ATOMIC);
1115 printk(KERN_WARNING "%s: isdnl2 can't alloc sbbuff in %s\n",
1116 mISDNDevName4ch(&l2->ch), __func__);
1119 skb_put_data(skb, tmp, i);
1120 enqueue_super(l2, skb);
1124 enquiry_response(struct layer2 *l2)
1126 if (test_bit(FLG_OWN_BUSY, &l2->flag))
1127 enquiry_cr(l2, RNR, RSP, 1);
1129 enquiry_cr(l2, RR, RSP, 1);
1130 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1134 transmit_enquiry(struct layer2 *l2)
1136 if (test_bit(FLG_OWN_BUSY, &l2->flag))
1137 enquiry_cr(l2, RNR, CMD, 1);
1139 enquiry_cr(l2, RR, CMD, 1);
1140 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1146 nrerrorrecovery(struct FsmInst *fi)
1148 struct layer2 *l2 = fi->userdata;
1150 l2mgr(l2, MDL_ERROR_IND, (void *) 'J');
1152 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1156 invoke_retransmission(struct layer2 *l2, unsigned int nr)
1161 while (l2->vs != nr) {
1163 if (test_bit(FLG_MOD128, &l2->flag)) {
1165 p1 = (l2->vs - l2->va) % 128;
1168 p1 = (l2->vs - l2->va) % 8;
1170 p1 = (p1 + l2->sow) % l2->window;
1171 if (l2->windowar[p1])
1172 skb_queue_head(&l2->i_queue, l2->windowar[p1]);
1175 "%s: windowar[%d] is NULL\n",
1176 mISDNDevName4ch(&l2->ch), p1);
1177 l2->windowar[p1] = NULL;
1179 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
1184 l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
1186 struct layer2 *l2 = fi->userdata;
1187 struct sk_buff *skb = arg;
1188 int PollFlag, rsp, typ = RR;
1191 rsp = *skb->data & 0x2;
1192 if (test_bit(FLG_ORIG, &l2->flag))
1195 skb_pull(skb, l2addrsize(l2));
1196 if (IsRNR(skb->data, l2)) {
1200 clear_peer_busy(l2);
1201 if (IsREJ(skb->data, l2))
1204 if (test_bit(FLG_MOD128, &l2->flag)) {
1205 PollFlag = (skb->data[1] & 0x1) == 0x1;
1206 nr = skb->data[1] >> 1;
1208 PollFlag = (skb->data[0] & 0x10);
1209 nr = (skb->data[0] >> 5) & 0x7;
1215 l2mgr(l2, MDL_ERROR_IND, (void *) 'A');
1217 enquiry_response(l2);
1219 if (legalnr(l2, nr)) {
1222 invoke_retransmission(l2, nr);
1224 if (mISDN_FsmAddTimer(&l2->t203, l2->T203,
1225 EV_L2_T203, NULL, 6))
1226 l2m_debug(&l2->l2m, "Restart T203 ST7 REJ");
1227 } else if ((nr == l2->vs) && (typ == RR)) {
1230 mISDN_FsmRestartTimer(&l2->t203, l2->T203,
1231 EV_L2_T203, NULL, 7);
1232 } else if ((l2->va != nr) || (typ == RNR)) {
1235 mISDN_FsmDelTimer(&l2->t203, 9);
1236 restart_t200(l2, 12);
1238 if (skb_queue_len(&l2->i_queue) && (typ == RR))
1239 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1241 nrerrorrecovery(fi);
1245 l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
1247 struct layer2 *l2 = fi->userdata;
1248 struct sk_buff *skb = arg;
1250 if (!test_bit(FLG_L3_INIT, &l2->flag))
1251 skb_queue_tail(&l2->i_queue, skb);
1257 l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
1259 struct layer2 *l2 = fi->userdata;
1260 struct sk_buff *skb = arg;
1262 skb_queue_tail(&l2->i_queue, skb);
1263 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1267 l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
1269 struct layer2 *l2 = fi->userdata;
1270 struct sk_buff *skb = arg;
1272 skb_queue_tail(&l2->i_queue, skb);
1276 l2_got_iframe(struct FsmInst *fi, int event, void *arg)
1278 struct layer2 *l2 = fi->userdata;
1279 struct sk_buff *skb = arg;
1284 if (test_bit(FLG_MOD128, &l2->flag)) {
1285 PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
1286 ns = skb->data[i] >> 1;
1287 nr = (skb->data[i + 1] >> 1) & 0x7f;
1289 PollFlag = (skb->data[i] & 0x10);
1290 ns = (skb->data[i] >> 1) & 0x7;
1291 nr = (skb->data[i] >> 5) & 0x7;
1293 if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
1296 enquiry_response(l2);
1300 if (test_bit(FLG_MOD128, &l2->flag))
1304 test_and_clear_bit(FLG_REJEXC, &l2->flag);
1306 enquiry_response(l2);
1308 test_and_set_bit(FLG_ACK_PEND, &l2->flag);
1309 skb_pull(skb, l2headersize(l2, 0));
1310 l2up(l2, DL_DATA_IND, skb);
1314 if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
1316 enquiry_response(l2);
1318 enquiry_cr(l2, REJ, RSP, PollFlag);
1319 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1323 if (legalnr(l2, nr)) {
1324 if (!test_bit(FLG_PEER_BUSY, &l2->flag) &&
1325 (fi->state == ST_L2_7)) {
1328 mISDN_FsmRestartTimer(&l2->t203, l2->T203,
1329 EV_L2_T203, NULL, 7);
1330 } else if (nr != l2->va)
1331 restart_t200(l2, 14);
1335 nrerrorrecovery(fi);
1338 if (skb_queue_len(&l2->i_queue) && (fi->state == ST_L2_7))
1339 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1340 if (test_and_clear_bit(FLG_ACK_PEND, &l2->flag))
1341 enquiry_cr(l2, RR, RSP, 0);
1345 l2_got_tei(struct FsmInst *fi, int event, void *arg)
1347 struct layer2 *l2 = fi->userdata;
1350 l2->tei = (signed char)(long)arg;
1351 set_channel_address(&l2->ch, l2->sapi, l2->tei);
1352 info = DL_INFO_L2_CONNECT;
1353 l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info);
1354 if (fi->state == ST_L2_3) {
1356 test_and_set_bit(FLG_L3_INIT, &l2->flag);
1358 mISDN_FsmChangeState(fi, ST_L2_4);
1359 if (skb_queue_len(&l2->ui_queue))
1364 l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
1366 struct layer2 *l2 = fi->userdata;
1368 if (test_bit(FLG_LAPD, &l2->flag) &&
1369 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1370 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1371 } else if (l2->rc == l2->N200) {
1372 mISDN_FsmChangeState(fi, ST_L2_4);
1373 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1374 skb_queue_purge(&l2->i_queue);
1375 l2mgr(l2, MDL_ERROR_IND, (void *) 'G');
1376 if (test_bit(FLG_LAPB, &l2->flag))
1377 l2down_create(l2, PH_DEACTIVATE_REQ,
1378 l2_newid(l2), 0, NULL);
1379 st5_dl_release_l2l3(l2);
1381 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1384 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1385 send_uframe(l2, NULL, (test_bit(FLG_MOD128, &l2->flag) ?
1386 SABME : SABM) | 0x10, CMD);
1391 l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
1393 struct layer2 *l2 = fi->userdata;
1395 if (test_bit(FLG_LAPD, &l2->flag) &&
1396 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1397 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1398 } else if (l2->rc == l2->N200) {
1399 mISDN_FsmChangeState(fi, ST_L2_4);
1400 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1401 l2mgr(l2, MDL_ERROR_IND, (void *) 'H');
1402 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1404 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1407 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200,
1409 send_uframe(l2, NULL, DISC | 0x10, CMD);
1414 l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
1416 struct layer2 *l2 = fi->userdata;
1418 if (test_bit(FLG_LAPD, &l2->flag) &&
1419 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1420 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1423 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1425 mISDN_FsmChangeState(fi, ST_L2_8);
1426 transmit_enquiry(l2);
1431 l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
1433 struct layer2 *l2 = fi->userdata;
1435 if (test_bit(FLG_LAPD, &l2->flag) &&
1436 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1437 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1440 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1441 if (l2->rc == l2->N200) {
1442 l2mgr(l2, MDL_ERROR_IND, (void *) 'I');
1444 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1446 transmit_enquiry(l2);
1452 l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
1454 struct layer2 *l2 = fi->userdata;
1456 if (test_bit(FLG_LAPD, &l2->flag) &&
1457 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1458 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 9);
1461 mISDN_FsmChangeState(fi, ST_L2_8);
1462 transmit_enquiry(l2);
1467 l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
1469 struct layer2 *l2 = fi->userdata;
1470 struct sk_buff *skb, *nskb;
1471 u_char header[MAX_L2HEADER_LEN];
1477 skb = skb_dequeue(&l2->i_queue);
1480 i = sethdraddr(l2, header, CMD);
1481 if (test_bit(FLG_MOD128, &l2->flag)) {
1482 header[i++] = l2->vs << 1;
1483 header[i++] = l2->vr << 1;
1485 header[i++] = (l2->vr << 5) | (l2->vs << 1);
1486 nskb = skb_realloc_headroom(skb, i);
1488 printk(KERN_WARNING "%s: no headroom(%d) copy for IFrame\n",
1489 mISDNDevName4ch(&l2->ch), i);
1490 skb_queue_head(&l2->i_queue, skb);
1493 if (test_bit(FLG_MOD128, &l2->flag)) {
1494 p1 = (l2->vs - l2->va) % 128;
1495 l2->vs = (l2->vs + 1) % 128;
1497 p1 = (l2->vs - l2->va) % 8;
1498 l2->vs = (l2->vs + 1) % 8;
1500 p1 = (p1 + l2->sow) % l2->window;
1501 if (l2->windowar[p1]) {
1502 printk(KERN_WARNING "%s: l2 try overwrite ack queue entry %d\n",
1503 mISDNDevName4ch(&l2->ch), p1);
1504 dev_kfree_skb(l2->windowar[p1]);
1506 l2->windowar[p1] = skb;
1507 memcpy(skb_push(nskb, i), header, i);
1508 l2down(l2, PH_DATA_REQ, l2_newid(l2), nskb);
1509 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1510 if (!test_and_set_bit(FLG_T200_RUN, &l2->flag)) {
1511 mISDN_FsmDelTimer(&l2->t203, 13);
1512 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 11);
1517 l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
1519 struct layer2 *l2 = fi->userdata;
1520 struct sk_buff *skb = arg;
1521 int PollFlag, rsp, rnr = 0;
1524 rsp = *skb->data & 0x2;
1525 if (test_bit(FLG_ORIG, &l2->flag))
1528 skb_pull(skb, l2addrsize(l2));
1530 if (IsRNR(skb->data, l2)) {
1534 clear_peer_busy(l2);
1536 if (test_bit(FLG_MOD128, &l2->flag)) {
1537 PollFlag = (skb->data[1] & 0x1) == 0x1;
1538 nr = skb->data[1] >> 1;
1540 PollFlag = (skb->data[0] & 0x10);
1541 nr = (skb->data[0] >> 5) & 0x7;
1544 if (rsp && PollFlag) {
1545 if (legalnr(l2, nr)) {
1547 restart_t200(l2, 15);
1550 mISDN_FsmAddTimer(&l2->t203, l2->T203,
1551 EV_L2_T203, NULL, 5);
1554 invoke_retransmission(l2, nr);
1555 mISDN_FsmChangeState(fi, ST_L2_7);
1556 if (skb_queue_len(&l2->i_queue) && cansend(l2))
1557 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1559 nrerrorrecovery(fi);
1561 if (!rsp && PollFlag)
1562 enquiry_response(l2);
1563 if (legalnr(l2, nr))
1566 nrerrorrecovery(fi);
1571 l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
1573 struct layer2 *l2 = fi->userdata;
1574 struct sk_buff *skb = arg;
1576 skb_pull(skb, l2addrsize(l2) + 1);
1578 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */
1579 (IsUA(skb->data) && (fi->state == ST_L2_7))) {
1580 l2mgr(l2, MDL_ERROR_IND, (void *) 'K');
1582 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1588 l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
1590 struct layer2 *l2 = fi->userdata;
1592 skb_queue_purge(&l2->ui_queue);
1593 l2->tei = GROUP_TEI;
1594 mISDN_FsmChangeState(fi, ST_L2_1);
1598 l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
1600 struct layer2 *l2 = fi->userdata;
1602 skb_queue_purge(&l2->ui_queue);
1603 l2->tei = GROUP_TEI;
1604 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1605 mISDN_FsmChangeState(fi, ST_L2_1);
1609 l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
1611 struct layer2 *l2 = fi->userdata;
1613 skb_queue_purge(&l2->i_queue);
1614 skb_queue_purge(&l2->ui_queue);
1616 l2->tei = GROUP_TEI;
1618 st5_dl_release_l2l3(l2);
1619 mISDN_FsmChangeState(fi, ST_L2_1);
1623 l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
1625 struct layer2 *l2 = fi->userdata;
1627 skb_queue_purge(&l2->ui_queue);
1628 l2->tei = GROUP_TEI;
1630 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1631 mISDN_FsmChangeState(fi, ST_L2_1);
1635 l2_tei_remove(struct FsmInst *fi, int event, void *arg)
1637 struct layer2 *l2 = fi->userdata;
1639 skb_queue_purge(&l2->i_queue);
1640 skb_queue_purge(&l2->ui_queue);
1642 l2->tei = GROUP_TEI;
1644 mISDN_FsmDelTimer(&l2->t203, 19);
1645 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1646 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
1647 * MGR_SHORTSTATUS_IND, SSTATUS_L2_RELEASED,
1650 mISDN_FsmChangeState(fi, ST_L2_1);
1654 l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg)
1656 struct layer2 *l2 = fi->userdata;
1657 struct sk_buff *skb = arg;
1659 skb_queue_purge(&l2->i_queue);
1660 skb_queue_purge(&l2->ui_queue);
1661 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
1662 l2up(l2, DL_RELEASE_IND, skb);
1668 l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
1670 struct layer2 *l2 = fi->userdata;
1671 struct sk_buff *skb = arg;
1673 skb_queue_purge(&l2->i_queue);
1674 skb_queue_purge(&l2->ui_queue);
1677 st5_dl_release_l2l3(l2);
1678 mISDN_FsmChangeState(fi, ST_L2_4);
1680 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1685 l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
1687 struct layer2 *l2 = fi->userdata;
1688 struct sk_buff *skb = arg;
1690 skb_queue_purge(&l2->ui_queue);
1692 l2up(l2, DL_RELEASE_CNF, skb);
1693 mISDN_FsmChangeState(fi, ST_L2_4);
1695 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1699 l2_persistent_da(struct FsmInst *fi, int event, void *arg)
1701 struct layer2 *l2 = fi->userdata;
1702 struct sk_buff *skb = arg;
1704 skb_queue_purge(&l2->i_queue);
1705 skb_queue_purge(&l2->ui_queue);
1708 mISDN_FsmDelTimer(&l2->t203, 19);
1709 l2up(l2, DL_RELEASE_IND, skb);
1710 mISDN_FsmChangeState(fi, ST_L2_4);
1712 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1716 l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
1718 struct layer2 *l2 = fi->userdata;
1719 struct sk_buff *skb = arg;
1721 if (!test_and_set_bit(FLG_OWN_BUSY, &l2->flag)) {
1722 enquiry_cr(l2, RNR, RSP, 0);
1723 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1730 l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
1732 struct layer2 *l2 = fi->userdata;
1733 struct sk_buff *skb = arg;
1735 if (!test_and_clear_bit(FLG_OWN_BUSY, &l2->flag)) {
1736 enquiry_cr(l2, RR, RSP, 0);
1737 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1744 l2_frame_error(struct FsmInst *fi, int event, void *arg)
1746 struct layer2 *l2 = fi->userdata;
1748 l2mgr(l2, MDL_ERROR_IND, arg);
1752 l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
1754 struct layer2 *l2 = fi->userdata;
1756 l2mgr(l2, MDL_ERROR_IND, arg);
1758 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1761 static struct FsmNode L2FnList[] =
1763 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
1764 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
1765 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
1766 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
1767 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1768 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1769 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
1770 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
1771 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1772 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1773 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
1774 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
1775 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
1776 {ST_L2_1, EV_L2_DL_UNITDATA, l2_queue_ui_assign},
1777 {ST_L2_2, EV_L2_DL_UNITDATA, l2_queue_ui},
1778 {ST_L2_3, EV_L2_DL_UNITDATA, l2_queue_ui},
1779 {ST_L2_4, EV_L2_DL_UNITDATA, l2_send_ui},
1780 {ST_L2_5, EV_L2_DL_UNITDATA, l2_send_ui},
1781 {ST_L2_6, EV_L2_DL_UNITDATA, l2_send_ui},
1782 {ST_L2_7, EV_L2_DL_UNITDATA, l2_send_ui},
1783 {ST_L2_8, EV_L2_DL_UNITDATA, l2_send_ui},
1784 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
1785 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
1786 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
1787 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
1788 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
1789 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
1790 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
1791 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
1792 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
1793 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
1794 {ST_L2_4, EV_L2_SABME, l2_start_multi},
1795 {ST_L2_5, EV_L2_SABME, l2_send_UA},
1796 {ST_L2_6, EV_L2_SABME, l2_send_DM},
1797 {ST_L2_7, EV_L2_SABME, l2_restart_multi},
1798 {ST_L2_8, EV_L2_SABME, l2_restart_multi},
1799 {ST_L2_4, EV_L2_DISC, l2_send_DM},
1800 {ST_L2_5, EV_L2_DISC, l2_send_DM},
1801 {ST_L2_6, EV_L2_DISC, l2_send_UA},
1802 {ST_L2_7, EV_L2_DISC, l2_stop_multi},
1803 {ST_L2_8, EV_L2_DISC, l2_stop_multi},
1804 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
1805 {ST_L2_5, EV_L2_UA, l2_connected},
1806 {ST_L2_6, EV_L2_UA, l2_released},
1807 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
1808 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
1809 {ST_L2_4, EV_L2_DM, l2_reestablish},
1810 {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
1811 {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
1812 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
1813 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
1814 {ST_L2_1, EV_L2_UI, l2_got_ui},
1815 {ST_L2_2, EV_L2_UI, l2_got_ui},
1816 {ST_L2_3, EV_L2_UI, l2_got_ui},
1817 {ST_L2_4, EV_L2_UI, l2_got_ui},
1818 {ST_L2_5, EV_L2_UI, l2_got_ui},
1819 {ST_L2_6, EV_L2_UI, l2_got_ui},
1820 {ST_L2_7, EV_L2_UI, l2_got_ui},
1821 {ST_L2_8, EV_L2_UI, l2_got_ui},
1822 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
1823 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
1824 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
1825 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
1826 {ST_L2_7, EV_L2_I, l2_got_iframe},
1827 {ST_L2_8, EV_L2_I, l2_got_iframe},
1828 {ST_L2_5, EV_L2_T200, l2_timeout},
1829 {ST_L2_6, EV_L2_T200, l2_timeout},
1830 {ST_L2_7, EV_L2_T200, l2_timeout},
1831 {ST_L2_8, EV_L2_T200, l2_timeout},
1832 {ST_L2_7, EV_L2_T203, l2_timeout},
1833 {ST_L2_5, EV_L2_T200I, l2_st5_tout_200},
1834 {ST_L2_6, EV_L2_T200I, l2_st6_tout_200},
1835 {ST_L2_7, EV_L2_T200I, l2_st7_tout_200},
1836 {ST_L2_8, EV_L2_T200I, l2_st8_tout_200},
1837 {ST_L2_7, EV_L2_T203I, l2_st7_tout_203},
1838 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
1839 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1840 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1841 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1842 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1843 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
1844 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
1845 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
1846 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1847 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1848 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1849 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
1850 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
1851 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1852 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
1853 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
1854 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
1855 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
1859 ph_data_indication(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb)
1861 u_char *datap = skb->data;
1868 if (skb->len <= l) {
1869 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *) 'N');
1872 if (test_bit(FLG_LAPD, &l2->flag)) { /* Maybe not needed */
1875 if ((psapi & 1) || !(ptei & 1)) {
1877 "%s l2 D-channel frame wrong EA0/EA1\n",
1878 mISDNDevName4ch(&l2->ch));
1883 if (psapi != l2->sapi) {
1884 /* not our business */
1885 if (*debug & DEBUG_L2)
1886 printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n",
1887 mISDNDevName4ch(&l2->ch), psapi,
1892 if ((ptei != l2->tei) && (ptei != GROUP_TEI)) {
1893 /* not our business */
1894 if (*debug & DEBUG_L2)
1895 printk(KERN_DEBUG "%s: tei %d/%d mismatch\n",
1896 mISDNDevName4ch(&l2->ch), ptei, l2->tei);
1902 if (!(*datap & 1)) { /* I-Frame */
1903 c = iframe_error(l2, skb);
1905 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_I, skb);
1906 } else if (IsSFrame(datap, l2)) { /* S-Frame */
1907 c = super_error(l2, skb);
1909 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SUPER, skb);
1910 } else if (IsUI(datap)) {
1911 c = UI_error(l2, skb);
1913 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UI, skb);
1914 } else if (IsSABME(datap, l2)) {
1915 c = unnum_error(l2, skb, CMD);
1917 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SABME, skb);
1918 } else if (IsUA(datap)) {
1919 c = unnum_error(l2, skb, RSP);
1921 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UA, skb);
1922 } else if (IsDISC(datap)) {
1923 c = unnum_error(l2, skb, CMD);
1925 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DISC, skb);
1926 } else if (IsDM(datap)) {
1927 c = unnum_error(l2, skb, RSP);
1929 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DM, skb);
1930 } else if (IsFRMR(datap)) {
1931 c = FRMR_error(l2, skb);
1933 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_FRMR, skb);
1937 printk(KERN_WARNING "%s:l2 D-channel frame error %c\n",
1938 mISDNDevName4ch(&l2->ch), c);
1939 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
1945 l2_send(struct mISDNchannel *ch, struct sk_buff *skb)
1947 struct layer2 *l2 = container_of(ch, struct layer2, ch);
1948 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1951 if (*debug & DEBUG_L2_RECV)
1952 printk(KERN_DEBUG "%s: %s prim(%x) id(%x) sapi(%d) tei(%d)\n",
1953 __func__, mISDNDevName4ch(&l2->ch), hh->prim, hh->id,
1955 if (hh->prim == DL_INTERN_MSG) {
1956 struct mISDNhead *chh = hh + 1; /* saved copy */
1959 if (*debug & DEBUG_L2_RECV)
1960 printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n",
1961 mISDNDevName4ch(&l2->ch), hh->prim, hh->id);
1965 ret = ph_data_indication(l2, hh, skb);
1968 ret = ph_data_confirm(l2, hh, skb);
1970 case PH_ACTIVATE_IND:
1971 test_and_set_bit(FLG_L1_ACTIV, &l2->flag);
1972 l2up_create(l2, MPH_ACTIVATE_IND, 0, NULL);
1973 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
1974 ret = mISDN_FsmEvent(&l2->l2m,
1975 EV_L2_DL_ESTABLISH_REQ, skb);
1977 case PH_DEACTIVATE_IND:
1978 test_and_clear_bit(FLG_L1_ACTIV, &l2->flag);
1979 l2up_create(l2, MPH_DEACTIVATE_IND, 0, NULL);
1980 ret = mISDN_FsmEvent(&l2->l2m, EV_L1_DEACTIVATE, skb);
1982 case MPH_INFORMATION_IND:
1985 ret = l2->up->send(l2->up, skb);
1988 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_DATA, skb);
1990 case DL_UNITDATA_REQ:
1991 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_UNITDATA, skb);
1993 case DL_ESTABLISH_REQ:
1994 if (test_bit(FLG_LAPB, &l2->flag))
1995 test_and_set_bit(FLG_ORIG, &l2->flag);
1996 if (test_bit(FLG_L1_ACTIV, &l2->flag)) {
1997 if (test_bit(FLG_LAPD, &l2->flag) ||
1998 test_bit(FLG_ORIG, &l2->flag))
1999 ret = mISDN_FsmEvent(&l2->l2m,
2000 EV_L2_DL_ESTABLISH_REQ, skb);
2002 if (test_bit(FLG_LAPD, &l2->flag) ||
2003 test_bit(FLG_ORIG, &l2->flag)) {
2004 test_and_set_bit(FLG_ESTAB_PEND,
2007 ret = l2down(l2, PH_ACTIVATE_REQ, l2_newid(l2),
2011 case DL_RELEASE_REQ:
2012 if (test_bit(FLG_LAPB, &l2->flag))
2013 l2down_create(l2, PH_DEACTIVATE_REQ,
2014 l2_newid(l2), 0, NULL);
2015 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ,
2018 case DL_TIMER200_IND:
2019 mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL);
2021 case DL_TIMER203_IND:
2022 mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL);
2025 if (*debug & DEBUG_L2)
2026 l2m_debug(&l2->l2m, "l2 unknown pr %04x",
2037 tei_l2(struct layer2 *l2, u_int cmd, u_long arg)
2041 if (*debug & DEBUG_L2_TEI)
2042 printk(KERN_DEBUG "%s: cmd(%x) in %s\n",
2043 mISDNDevName4ch(&l2->ch), cmd, __func__);
2045 case (MDL_ASSIGN_REQ):
2046 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ASSIGN, (void *)arg);
2048 case (MDL_REMOVE_REQ):
2049 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_REMOVE, NULL);
2051 case (MDL_ERROR_IND):
2052 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
2054 case (MDL_ERROR_RSP):
2055 /* ETS 300-125 5.3.2.1 Test: TC13010 */
2056 printk(KERN_NOTICE "%s: MDL_ERROR|REQ (tei_l2)\n",
2057 mISDNDevName4ch(&l2->ch));
2058 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
2065 release_l2(struct layer2 *l2)
2067 mISDN_FsmDelTimer(&l2->t200, 21);
2068 mISDN_FsmDelTimer(&l2->t203, 16);
2069 skb_queue_purge(&l2->i_queue);
2070 skb_queue_purge(&l2->ui_queue);
2071 skb_queue_purge(&l2->down_queue);
2073 if (test_bit(FLG_LAPD, &l2->flag)) {
2076 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D,
2077 CLOSE_CHANNEL, NULL);
2083 l2_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
2085 struct layer2 *l2 = container_of(ch, struct layer2, ch);
2088 if (*debug & DEBUG_L2_CTRL)
2089 printk(KERN_DEBUG "%s: %s cmd(%x)\n",
2090 mISDNDevName4ch(ch), __func__, cmd);
2094 if (test_bit(FLG_LAPD, &l2->flag)) {
2095 set_channel_address(&l2->ch, l2->sapi, l2->tei);
2096 info = DL_INFO_L2_CONNECT;
2097 l2up_create(l2, DL_INFORMATION_IND,
2098 sizeof(info), &info);
2103 l2->ch.peer->ctrl(l2->ch.peer, CLOSE_CHANNEL, NULL);
2111 create_l2(struct mISDNchannel *ch, u_int protocol, u_long options, int tei,
2115 struct channel_req rq;
2117 l2 = kzalloc(sizeof(struct layer2), GFP_KERNEL);
2119 printk(KERN_ERR "kzalloc layer2 failed\n");
2123 l2->down_id = MISDN_ID_NONE;
2126 l2->ch.send = l2_send;
2127 l2->ch.ctrl = l2_ctrl;
2129 case ISDN_P_LAPD_NT:
2130 test_and_set_bit(FLG_LAPD, &l2->flag);
2131 test_and_set_bit(FLG_LAPD_NET, &l2->flag);
2132 test_and_set_bit(FLG_MOD128, &l2->flag);
2134 l2->maxlen = MAX_DFRAME_LEN;
2135 if (test_bit(OPTION_L2_PMX, &options))
2139 if (test_bit(OPTION_L2_PTP, &options))
2140 test_and_set_bit(FLG_PTP, &l2->flag);
2141 if (test_bit(OPTION_L2_FIXEDTEI, &options))
2142 test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
2147 if (test_bit(OPTION_L2_PMX, &options))
2148 rq.protocol = ISDN_P_NT_E1;
2150 rq.protocol = ISDN_P_NT_S0;
2152 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
2154 case ISDN_P_LAPD_TE:
2155 test_and_set_bit(FLG_LAPD, &l2->flag);
2156 test_and_set_bit(FLG_MOD128, &l2->flag);
2157 test_and_set_bit(FLG_ORIG, &l2->flag);
2159 l2->maxlen = MAX_DFRAME_LEN;
2160 if (test_bit(OPTION_L2_PMX, &options))
2164 if (test_bit(OPTION_L2_PTP, &options))
2165 test_and_set_bit(FLG_PTP, &l2->flag);
2166 if (test_bit(OPTION_L2_FIXEDTEI, &options))
2167 test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
2172 if (test_bit(OPTION_L2_PMX, &options))
2173 rq.protocol = ISDN_P_TE_E1;
2175 rq.protocol = ISDN_P_TE_S0;
2177 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
2179 case ISDN_P_B_X75SLP:
2180 test_and_set_bit(FLG_LAPB, &l2->flag);
2182 l2->maxlen = MAX_DATA_SIZE;
2190 printk(KERN_ERR "layer2 create failed prt %x\n",
2195 skb_queue_head_init(&l2->i_queue);
2196 skb_queue_head_init(&l2->ui_queue);
2197 skb_queue_head_init(&l2->down_queue);
2198 skb_queue_head_init(&l2->tmp_queue);
2200 l2->l2m.fsm = &l2fsm;
2201 if (test_bit(FLG_LAPB, &l2->flag) ||
2202 test_bit(FLG_FIXED_TEI, &l2->flag) ||
2203 test_bit(FLG_LAPD_NET, &l2->flag))
2204 l2->l2m.state = ST_L2_4;
2206 l2->l2m.state = ST_L2_1;
2207 l2->l2m.debug = *debug;
2208 l2->l2m.userdata = l2;
2209 l2->l2m.userint = 0;
2210 l2->l2m.printdebug = l2m_debug;
2212 mISDN_FsmInitTimer(&l2->l2m, &l2->t200);
2213 mISDN_FsmInitTimer(&l2->l2m, &l2->t203);
2218 x75create(struct channel_req *crq)
2222 if (crq->protocol != ISDN_P_B_X75SLP)
2223 return -EPROTONOSUPPORT;
2224 l2 = create_l2(crq->ch, crq->protocol, 0, 0, 0);
2228 crq->protocol = ISDN_P_B_HDLC;
2232 static struct Bprotocol X75SLP = {
2233 .Bprotocols = (1 << (ISDN_P_B_X75SLP & ISDN_P_B_MASK)),
2239 Isdnl2_Init(u_int *deb)
2243 mISDN_register_Bprotocol(&X75SLP);
2244 l2fsm.state_count = L2_STATE_COUNT;
2245 l2fsm.event_count = L2_EVENT_COUNT;
2246 l2fsm.strEvent = strL2Event;
2247 l2fsm.strState = strL2State;
2248 res = mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
2257 mISDN_FsmFree(&l2fsm);
2259 mISDN_unregister_Bprotocol(&X75SLP);
2264 Isdnl2_cleanup(void)
2266 mISDN_unregister_Bprotocol(&X75SLP);
2268 mISDN_FsmFree(&l2fsm);