isdnl2.c
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上传日期:2013-02-24
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- /* $Id: isdnl2.c,v 1.1.4.1 2001/11/20 14:19:36 kai Exp $
- *
- * Author Karsten Keil
- * based on the teles driver from Jan den Ouden
- * Copyright by Karsten Keil <keil@isdn4linux.de>
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- * For changes and modifications please read
- * ../../../Documentation/isdn/HiSax.cert
- *
- * Thanks to Jan den Ouden
- * Fritz Elfert
- *
- */
- #define __NO_VERSION__
- #include <linux/init.h>
- #include "hisax.h"
- #include "isdnl2.h"
- const char *l2_revision = "$Revision: 1.1.4.1 $";
- static void l2m_debug(struct FsmInst *fi, char *fmt, ...);
- static struct Fsm l2fsm;
- enum {
- ST_L2_1,
- ST_L2_2,
- ST_L2_3,
- ST_L2_4,
- ST_L2_5,
- ST_L2_6,
- ST_L2_7,
- ST_L2_8,
- };
- #define L2_STATE_COUNT (ST_L2_8+1)
- static char *strL2State[] =
- {
- "ST_L2_1",
- "ST_L2_2",
- "ST_L2_3",
- "ST_L2_4",
- "ST_L2_5",
- "ST_L2_6",
- "ST_L2_7",
- "ST_L2_8",
- };
- enum {
- EV_L2_UI,
- EV_L2_SABME,
- EV_L2_DISC,
- EV_L2_DM,
- EV_L2_UA,
- EV_L2_FRMR,
- EV_L2_SUPER,
- EV_L2_I,
- EV_L2_DL_DATA,
- EV_L2_ACK_PULL,
- EV_L2_DL_UNIT_DATA,
- EV_L2_DL_ESTABLISH_REQ,
- EV_L2_DL_RELEASE_REQ,
- EV_L2_MDL_ASSIGN,
- EV_L2_MDL_REMOVE,
- EV_L2_MDL_ERROR,
- EV_L1_DEACTIVATE,
- EV_L2_T200,
- EV_L2_T203,
- EV_L2_SET_OWN_BUSY,
- EV_L2_CLEAR_OWN_BUSY,
- EV_L2_FRAME_ERROR,
- };
- #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR+1)
- static char *strL2Event[] =
- {
- "EV_L2_UI",
- "EV_L2_SABME",
- "EV_L2_DISC",
- "EV_L2_DM",
- "EV_L2_UA",
- "EV_L2_FRMR",
- "EV_L2_SUPER",
- "EV_L2_I",
- "EV_L2_DL_DATA",
- "EV_L2_ACK_PULL",
- "EV_L2_DL_UNIT_DATA",
- "EV_L2_DL_ESTABLISH_REQ",
- "EV_L2_DL_RELEASE_REQ",
- "EV_L2_MDL_ASSIGN",
- "EV_L2_MDL_REMOVE",
- "EV_L2_MDL_ERROR",
- "EV_L1_DEACTIVATE",
- "EV_L2_T200",
- "EV_L2_T203",
- "EV_L2_SET_OWN_BUSY",
- "EV_L2_CLEAR_OWN_BUSY",
- "EV_L2_FRAME_ERROR",
- };
- static int l2addrsize(struct Layer2 *l2);
- static void
- set_peer_busy(struct Layer2 *l2) {
- test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
- if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
- test_and_set_bit(FLG_L2BLOCK, &l2->flag);
- }
- static void
- clear_peer_busy(struct Layer2 *l2) {
- if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
- test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
- }
- static void
- InitWin(struct Layer2 *l2)
- {
- int i;
- for (i = 0; i < MAX_WINDOW; i++)
- l2->windowar[i] = NULL;
- }
- static int
- freewin1(struct Layer2 *l2)
- {
- int i, cnt = 0;
- for (i = 0; i < MAX_WINDOW; i++) {
- if (l2->windowar[i]) {
- cnt++;
- dev_kfree_skb(l2->windowar[i]);
- l2->windowar[i] = NULL;
- }
- }
- return cnt;
- }
- inline void
- freewin(struct PStack *st)
- {
- freewin1(&st->l2);
- }
- static void
- ReleaseWin(struct Layer2 *l2)
- {
- int cnt;
- if((cnt = freewin1(l2)))
- printk(KERN_WARNING "isdl2 freed %d skbuffs in releasen", cnt);
- }
- inline unsigned int
- cansend(struct PStack *st)
- {
- unsigned int p1;
- if(test_bit(FLG_MOD128, &st->l2.flag))
- p1 = (st->l2.vs - st->l2.va) % 128;
- else
- p1 = (st->l2.vs - st->l2.va) % 8;
- return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag));
- }
- inline void
- clear_exception(struct Layer2 *l2)
- {
- test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
- test_and_clear_bit(FLG_REJEXC, &l2->flag);
- test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
- clear_peer_busy(l2);
- }
- inline int
- l2headersize(struct Layer2 *l2, int ui)
- {
- return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
- (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1));
- }
- inline int
- l2addrsize(struct Layer2 *l2)
- {
- return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
- }
- static int
- sethdraddr(struct Layer2 *l2, u_char * header, int rsp)
- {
- u_char *ptr = header;
- int crbit = rsp;
- if (test_bit(FLG_LAPD, &l2->flag)) {
- *ptr++ = (l2->sap << 2) | (rsp ? 2 : 0);
- *ptr++ = (l2->tei << 1) | 1;
- return (2);
- } else {
- if (test_bit(FLG_ORIG, &l2->flag))
- crbit = !crbit;
- if (crbit)
- *ptr++ = 1;
- else
- *ptr++ = 3;
- return (1);
- }
- }
- inline static void
- enqueue_super(struct PStack *st,
- struct sk_buff *skb)
- {
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l1.bcs->tx_cnt += skb->len;
- st->l2.l2l1(st, PH_DATA | REQUEST, skb);
- }
- #define enqueue_ui(a, b) enqueue_super(a, b)
- inline int
- IsUI(u_char * data)
- {
- return ((data[0] & 0xef) == UI);
- }
- inline int
- IsUA(u_char * data)
- {
- return ((data[0] & 0xef) == UA);
- }
- inline int
- IsDM(u_char * data)
- {
- return ((data[0] & 0xef) == DM);
- }
- inline int
- IsDISC(u_char * data)
- {
- return ((data[0] & 0xef) == DISC);
- }
- inline int
- IsRR(u_char * data, struct PStack *st)
- {
- if (test_bit(FLG_MOD128, &st->l2.flag))
- return (data[0] == RR);
- else
- return ((data[0] & 0xf) == 1);
- }
- inline int
- IsSFrame(u_char * data, struct PStack *st)
- {
- register u_char d = *data;
-
- if (!test_bit(FLG_MOD128, &st->l2.flag))
- d &= 0xf;
- return(((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c));
- }
- inline int
- IsSABME(u_char * data, struct PStack *st)
- {
- u_char d = data[0] & ~0x10;
- return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM);
- }
- inline int
- IsREJ(u_char * data, struct PStack *st)
- {
- return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
- }
- inline int
- IsFRMR(u_char * data)
- {
- return ((data[0] & 0xef) == FRMR);
- }
- inline int
- IsRNR(u_char * data, struct PStack *st)
- {
- return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
- }
- int
- iframe_error(struct PStack *st, struct sk_buff *skb)
- {
- int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1);
- int rsp = *skb->data & 0x2;
- if (test_bit(FLG_ORIG, &st->l2.flag))
- rsp = !rsp;
- if (rsp)
- return 'L';
- if (skb->len < i)
- return 'N';
- if ((skb->len - i) > st->l2.maxlen)
- return 'O';
- return 0;
- }
- int
- super_error(struct PStack *st, struct sk_buff *skb)
- {
- if (skb->len != l2addrsize(&st->l2) +
- (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1))
- return 'N';
- return 0;
- }
- int
- unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp)
- {
- int rsp = (*skb->data & 0x2) >> 1;
- if (test_bit(FLG_ORIG, &st->l2.flag))
- rsp = !rsp;
- if (rsp != wantrsp)
- return 'L';
- if (skb->len != l2addrsize(&st->l2) + 1)
- return 'N';
- return 0;
- }
- int
- UI_error(struct PStack *st, struct sk_buff *skb)
- {
- int rsp = *skb->data & 0x2;
- if (test_bit(FLG_ORIG, &st->l2.flag))
- rsp = !rsp;
- if (rsp)
- return 'L';
- if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1)
- return 'O';
- return 0;
- }
- int
- FRMR_error(struct PStack *st, struct sk_buff *skb)
- {
- int headers = l2addrsize(&st->l2) + 1;
- u_char *datap = skb->data + headers;
- int rsp = *skb->data & 0x2;
- if (test_bit(FLG_ORIG, &st->l2.flag))
- rsp = !rsp;
- if (!rsp)
- return 'L';
- if (test_bit(FLG_MOD128, &st->l2.flag)) {
- if (skb->len < headers + 5)
- return 'N';
- else
- l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x",
- datap[0], datap[1], datap[2],
- datap[3], datap[4]);
- } else {
- if (skb->len < headers + 3)
- return 'N';
- else
- l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x",
- datap[0], datap[1], datap[2]);
- }
- return 0;
- }
- static unsigned int
- legalnr(struct PStack *st, unsigned int nr)
- {
- struct Layer2 *l2 = &st->l2;
- if(test_bit(FLG_MOD128, &l2->flag))
- return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
- else
- return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
- }
- static void
- setva(struct PStack *st, unsigned int nr)
- {
- struct Layer2 *l2 = &st->l2;
- int len;
- while (l2->va != nr) {
- (l2->va)++;
- if(test_bit(FLG_MOD128, &l2->flag))
- l2->va %= 128;
- else
- l2->va %= 8;
- len = l2->windowar[l2->sow]->len;
- if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type)
- len = -1;
- dev_kfree_skb(l2->windowar[l2->sow]);
- l2->windowar[l2->sow] = NULL;
- l2->sow = (l2->sow + 1) % l2->window;
- if (st->lli.l2writewakeup && (len >=0))
- st->lli.l2writewakeup(st, len);
- }
- }
- static void
- send_uframe(struct PStack *st, u_char cmd, u_char cr)
- {
- struct sk_buff *skb;
- u_char tmp[MAX_HEADER_LEN];
- int i;
- i = sethdraddr(&st->l2, tmp, cr);
- tmp[i++] = cmd;
- if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
- printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframen");
- return;
- }
- memcpy(skb_put(skb, i), tmp, i);
- enqueue_super(st, skb);
- }
- inline u_char
- get_PollFlag(struct PStack * st, struct sk_buff * skb)
- {
- return (skb->data[l2addrsize(&(st->l2))] & 0x10);
- }
- inline void
- FreeSkb(struct sk_buff *skb)
- {
- dev_kfree_skb(skb);
- }
- inline u_char
- get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
- {
- u_char PF;
- PF = get_PollFlag(st, skb);
- FreeSkb(skb);
- return (PF);
- }
- inline void
- start_t200(struct PStack *st, int i)
- {
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
- test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
- }
- inline void
- restart_t200(struct PStack *st, int i)
- {
- FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
- test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
- }
- inline void
- stop_t200(struct PStack *st, int i)
- {
- if(test_and_clear_bit(FLG_T200_RUN, &st->l2.flag))
- FsmDelTimer(&st->l2.t200, i);
- }
- inline void
- st5_dl_release_l2l3(struct PStack *st)
- {
- int pr;
- if(test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
- pr = DL_RELEASE | CONFIRM;
- else
- pr = DL_RELEASE | INDICATION;
- st->l2.l2l3(st, pr, NULL);
- }
- inline void
- lapb_dl_release_l2l3(struct PStack *st, int f)
- {
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
- st->l2.l2l3(st, DL_RELEASE | f, NULL);
- }
- static void
- establishlink(struct FsmInst *fi)
- {
- struct PStack *st = fi->userdata;
- u_char cmd;
- clear_exception(&st->l2);
- st->l2.rc = 0;
- cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10;
- send_uframe(st, cmd, CMD);
- FsmDelTimer(&st->l2.t203, 1);
- restart_t200(st, 1);
- test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
- freewin(st);
- FsmChangeState(fi, ST_L2_5);
- }
- static void
- l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
- {
- struct sk_buff *skb = arg;
- struct PStack *st = fi->userdata;
- if (get_PollFlagFree(st, skb))
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C');
- else
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D');
- }
- static void
- l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
- {
- struct sk_buff *skb = arg;
- struct PStack *st = fi->userdata;
- if (get_PollFlagFree(st, skb))
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
- else {
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- }
- }
- static void
- l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
- {
- struct sk_buff *skb = arg;
- struct PStack *st = fi->userdata;
- if (get_PollFlagFree(st, skb))
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
- else {
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
- }
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- }
- static void
- l2_go_st3(struct FsmInst *fi, int event, void *arg)
- {
- FsmChangeState(fi, ST_L2_3);
- }
- static void
- l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- FsmChangeState(fi, ST_L2_3);
- st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
- }
- static void
- l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- skb_queue_tail(&st->l2.ui_queue, skb);
- FsmChangeState(fi, ST_L2_2);
- st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
- }
- static void
- l2_queue_ui(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- skb_queue_tail(&st->l2.ui_queue, skb);
- }
- static void
- tx_ui(struct PStack *st)
- {
- struct sk_buff *skb;
- u_char header[MAX_HEADER_LEN];
- int i;
- i = sethdraddr(&(st->l2), header, CMD);
- header[i++] = UI;
- while ((skb = skb_dequeue(&st->l2.ui_queue))) {
- memcpy(skb_push(skb, i), header, i);
- enqueue_ui(st, skb);
- }
- }
- static void
- l2_send_ui(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- skb_queue_tail(&st->l2.ui_queue, skb);
- tx_ui(st);
- }
- static void
- l2_got_ui(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- skb_pull(skb, l2headersize(&st->l2, 1));
- st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb);
- /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- * in states 1-3 for broadcast
- */
- }
- static void
- l2_establish(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- establishlink(fi);
- test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
- }
- static void
- l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
- test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
- }
- static void
- l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- establishlink(fi);
- test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
- }
- static void
- l2_release(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
- }
- static void
- l2_pend_rel(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- test_and_set_bit(FLG_PEND_REL, &st->l2.flag);
- }
- static void
- l2_disconnect(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- freewin(st);
- FsmChangeState(fi, ST_L2_6);
- st->l2.rc = 0;
- send_uframe(st, DISC | 0x10, CMD);
- FsmDelTimer(&st->l2.t203, 1);
- restart_t200(st, 2);
- }
- static void
- l2_start_multi(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
- clear_exception(&st->l2);
- st->l2.vs = 0;
- st->l2.va = 0;
- st->l2.vr = 0;
- st->l2.sow = 0;
- FsmChangeState(fi, ST_L2_7);
- FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
- st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
- }
- static void
- l2_send_UA(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
- }
- static void
- l2_send_DM(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- send_uframe(st, DM | get_PollFlagFree(st, skb), RSP);
- }
- static void
- l2_restart_multi(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- int est = 0, state;
- state = fi->state;
- send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F');
- if (st->l2.vs != st->l2.va) {
- skb_queue_purge(&st->l2.i_queue);
- est = 1;
- }
- clear_exception(&st->l2);
- st->l2.vs = 0;
- st->l2.va = 0;
- st->l2.vr = 0;
- st->l2.sow = 0;
- FsmChangeState(fi, ST_L2_7);
- stop_t200(st, 3);
- FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
- if (est)
- st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
- if ((ST_L2_7==state) || (ST_L2_8 == state))
- if (skb_queue_len(&st->l2.i_queue) && cansend(st))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- }
- static void
- l2_stop_multi(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- FsmChangeState(fi, ST_L2_4);
- FsmDelTimer(&st->l2.t203, 3);
- stop_t200(st, 4);
- send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
- skb_queue_purge(&st->l2.i_queue);
- freewin(st);
- lapb_dl_release_l2l3(st, INDICATION);
- }
- static void
- l2_connected(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- int pr=-1;
- if (!get_PollFlag(st, skb)) {
- l2_mdl_error_ua(fi, event, arg);
- return;
- }
- FreeSkb(skb);
- if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
- l2_disconnect(fi, event, arg);
- if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) {
- pr = DL_ESTABLISH | CONFIRM;
- } else if (st->l2.vs != st->l2.va) {
- skb_queue_purge(&st->l2.i_queue);
- pr = DL_ESTABLISH | INDICATION;
- }
- stop_t200(st, 5);
- st->l2.vr = 0;
- st->l2.vs = 0;
- st->l2.va = 0;
- st->l2.sow = 0;
- FsmChangeState(fi, ST_L2_7);
- FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4);
- if (pr != -1)
- st->l2.l2l3(st, pr, NULL);
- if (skb_queue_len(&st->l2.i_queue) && cansend(st))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- }
- static void
- l2_released(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (!get_PollFlag(st, skb)) {
- l2_mdl_error_ua(fi, event, arg);
- return;
- }
- FreeSkb(skb);
- stop_t200(st, 6);
- lapb_dl_release_l2l3(st, CONFIRM);
- FsmChangeState(fi, ST_L2_4);
- }
- static void
- l2_reestablish(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (!get_PollFlagFree(st, skb)) {
- establishlink(fi);
- test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
- }
- }
- static void
- l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (get_PollFlagFree(st, skb)) {
- stop_t200(st, 7);
- if (!test_bit(FLG_L3_INIT, &st->l2.flag))
- skb_queue_purge(&st->l2.i_queue);
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
- st5_dl_release_l2l3(st);
- FsmChangeState(fi, ST_L2_4);
- }
- }
- static void
- l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (get_PollFlagFree(st, skb)) {
- stop_t200(st, 8);
- lapb_dl_release_l2l3(st, CONFIRM);
- FsmChangeState(fi, ST_L2_4);
- }
- }
- inline void
- enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf)
- {
- struct sk_buff *skb;
- struct Layer2 *l2;
- u_char tmp[MAX_HEADER_LEN];
- int i;
- l2 = &st->l2;
- i = sethdraddr(l2, tmp, cr);
- if (test_bit(FLG_MOD128, &l2->flag)) {
- tmp[i++] = typ;
- tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
- } else
- tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
- if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
- printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_crn");
- return;
- }
- memcpy(skb_put(skb, i), tmp, i);
- enqueue_super(st, skb);
- }
- inline void
- enquiry_response(struct PStack *st)
- {
- if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
- enquiry_cr(st, RNR, RSP, 1);
- else
- enquiry_cr(st, RR, RSP, 1);
- test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
- }
- inline void
- transmit_enquiry(struct PStack *st)
- {
- if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
- enquiry_cr(st, RNR, CMD, 1);
- else
- enquiry_cr(st, RR, CMD, 1);
- test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
- start_t200(st, 9);
- }
- static void
- nrerrorrecovery(struct FsmInst *fi)
- {
- struct PStack *st = fi->userdata;
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J');
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- }
- static void
- invoke_retransmission(struct PStack *st, unsigned int nr)
- {
- struct Layer2 *l2 = &st->l2;
- unsigned int p1;
- if (l2->vs != nr) {
- while (l2->vs != nr) {
- (l2->vs)--;
- if(test_bit(FLG_MOD128, &l2->flag)) {
- l2->vs %= 128;
- p1 = (l2->vs - l2->va) % 128;
- } else {
- l2->vs %= 8;
- p1 = (l2->vs - l2->va) % 8;
- }
- p1 = (p1 + l2->sow) % l2->window;
- if (test_bit(FLG_LAPB, &l2->flag))
- st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0);
- skb_queue_head(&l2->i_queue, l2->windowar[p1]);
- l2->windowar[p1] = NULL;
- }
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- }
- }
- static void
- l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- int PollFlag, rsp, typ = RR;
- unsigned int nr;
- struct Layer2 *l2 = &st->l2;
- rsp = *skb->data & 0x2;
- if (test_bit(FLG_ORIG, &l2->flag))
- rsp = !rsp;
- skb_pull(skb, l2addrsize(l2));
- if (IsRNR(skb->data, st)) {
- set_peer_busy(l2);
- typ = RNR;
- } else
- clear_peer_busy(l2);
- if (IsREJ(skb->data, st))
- typ = REJ;
- if (test_bit(FLG_MOD128, &l2->flag)) {
- PollFlag = (skb->data[1] & 0x1) == 0x1;
- nr = skb->data[1] >> 1;
- } else {
- PollFlag = (skb->data[0] & 0x10);
- nr = (skb->data[0] >> 5) & 0x7;
- }
- FreeSkb(skb);
- if (PollFlag) {
- if (rsp)
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A');
- else
- enquiry_response(st);
- }
- if (legalnr(st, nr)) {
- if (typ == REJ) {
- setva(st, nr);
- invoke_retransmission(st, nr);
- stop_t200(st, 10);
- if (FsmAddTimer(&st->l2.t203, st->l2.T203,
- EV_L2_T203, NULL, 6))
- l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ");
- } else if ((nr == l2->vs) && (typ == RR)) {
- setva(st, nr);
- stop_t200(st, 11);
- FsmRestartTimer(&st->l2.t203, st->l2.T203,
- EV_L2_T203, NULL, 7);
- } else if ((l2->va != nr) || (typ == RNR)) {
- setva(st, nr);
- if(typ != RR) FsmDelTimer(&st->l2.t203, 9);
- restart_t200(st, 12);
- }
- if (skb_queue_len(&st->l2.i_queue) && (typ == RR))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- } else
- nrerrorrecovery(fi);
- }
- static void
- l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
- if (!test_bit(FLG_L3_INIT, &st->l2.flag))
- skb_queue_tail(&st->l2.i_queue, skb);
- else
- FreeSkb(skb);
- }
- static void
- l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
- skb_queue_tail(&st->l2.i_queue, skb);
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- }
- static void
- l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
- skb_queue_tail(&st->l2.i_queue, skb);
- }
- static void
- l2_got_iframe(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- struct Layer2 *l2 = &(st->l2);
- int PollFlag, ns, i;
- unsigned int nr;
- i = l2addrsize(l2);
- if (test_bit(FLG_MOD128, &l2->flag)) {
- PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
- ns = skb->data[i] >> 1;
- nr = (skb->data[i + 1] >> 1) & 0x7f;
- } else {
- PollFlag = (skb->data[i] & 0x10);
- ns = (skb->data[i] >> 1) & 0x7;
- nr = (skb->data[i] >> 5) & 0x7;
- }
- if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
- FreeSkb(skb);
- if(PollFlag) enquiry_response(st);
- } else if (l2->vr == ns) {
- (l2->vr)++;
- if(test_bit(FLG_MOD128, &l2->flag))
- l2->vr %= 128;
- else
- l2->vr %= 8;
- test_and_clear_bit(FLG_REJEXC, &l2->flag);
- if (PollFlag)
- enquiry_response(st);
- else
- test_and_set_bit(FLG_ACK_PEND, &l2->flag);
- skb_pull(skb, l2headersize(l2, 0));
- st->l2.l2l3(st, DL_DATA | INDICATION, skb);
- } else {
- /* n(s)!=v(r) */
- FreeSkb(skb);
- if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
- if (PollFlag)
- enquiry_response(st);
- } else {
- enquiry_cr(st, REJ, RSP, PollFlag);
- test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
- }
- }
- if (legalnr(st, nr)) {
- if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) {
- if (nr == st->l2.vs) {
- stop_t200(st, 13);
- FsmRestartTimer(&st->l2.t203, st->l2.T203,
- EV_L2_T203, NULL, 7);
- } else if (nr != st->l2.va)
- restart_t200(st, 14);
- }
- setva(st, nr);
- } else {
- nrerrorrecovery(fi);
- return;
- }
- if (skb_queue_len(&st->l2.i_queue) && (fi->state == ST_L2_7))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag))
- enquiry_cr(st, RR, RSP, 0);
- }
- static void
- l2_got_tei(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- st->l2.tei = (long) arg;
- if (fi->state == ST_L2_3) {
- establishlink(fi);
- test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
- } else
- FsmChangeState(fi, ST_L2_4);
- if (skb_queue_len(&st->l2.ui_queue))
- tx_ui(st);
- }
- static void
- l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if (test_bit(FLG_LAPD, &st->l2.flag) &&
- test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
- } else if (st->l2.rc == st->l2.N200) {
- FsmChangeState(fi, ST_L2_4);
- test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
- skb_queue_purge(&st->l2.i_queue);
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G');
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
- st5_dl_release_l2l3(st);
- } else {
- st->l2.rc++;
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
- send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM)
- | 0x10, CMD);
- }
- }
- static void
- l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if (test_bit(FLG_LAPD, &st->l2.flag) &&
- test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
- } else if (st->l2.rc == st->l2.N200) {
- FsmChangeState(fi, ST_L2_4);
- test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H');
- lapb_dl_release_l2l3(st, CONFIRM);
- } else {
- st->l2.rc++;
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200,
- NULL, 9);
- send_uframe(st, DISC | 0x10, CMD);
- }
- }
- static void
- l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if (test_bit(FLG_LAPD, &st->l2.flag) &&
- test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
- return;
- }
- test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
- st->l2.rc = 0;
- FsmChangeState(fi, ST_L2_8);
- transmit_enquiry(st);
- st->l2.rc++;
- }
- static void
- l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if (test_bit(FLG_LAPD, &st->l2.flag) &&
- test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
- return;
- }
- test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
- if (st->l2.rc == st->l2.N200) {
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I');
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- } else {
- transmit_enquiry(st);
- st->l2.rc++;
- }
- }
- static void
- l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if (test_bit(FLG_LAPD, &st->l2.flag) &&
- test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
- FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9);
- return;
- }
- FsmChangeState(fi, ST_L2_8);
- transmit_enquiry(st);
- st->l2.rc = 0;
- }
- static void
- l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb, *oskb;
- struct Layer2 *l2 = &st->l2;
- u_char header[MAX_HEADER_LEN];
- int i;
- int unsigned p1;
- long flags;
- if (!cansend(st))
- return;
- skb = skb_dequeue(&l2->i_queue);
- if (!skb)
- return;
- save_flags(flags);
- cli();
- if(test_bit(FLG_MOD128, &l2->flag))
- p1 = (l2->vs - l2->va) % 128;
- else
- p1 = (l2->vs - l2->va) % 8;
- p1 = (p1 + l2->sow) % l2->window;
- if (l2->windowar[p1]) {
- printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %dn",
- p1);
- dev_kfree_skb(l2->windowar[p1]);
- }
- l2->windowar[p1] = skb_clone(skb, GFP_ATOMIC);
- i = sethdraddr(&st->l2, header, CMD);
- if (test_bit(FLG_MOD128, &l2->flag)) {
- header[i++] = l2->vs << 1;
- header[i++] = l2->vr << 1;
- l2->vs = (l2->vs + 1) % 128;
- } else {
- header[i++] = (l2->vr << 5) | (l2->vs << 1);
- l2->vs = (l2->vs + 1) % 8;
- }
- restore_flags(flags);
- p1 = skb->data - skb->head;
- if (p1 >= i)
- memcpy(skb_push(skb, i), header, i);
- else {
- printk(KERN_WARNING
- "isdl2 pull_iqueue skb header(%d/%d) too shortn", i, p1);
- oskb = skb;
- skb = alloc_skb(oskb->len + i, GFP_ATOMIC);
- memcpy(skb_put(skb, i), header, i);
- memcpy(skb_put(skb, oskb->len), oskb->data, oskb->len);
- FreeSkb(oskb);
- }
- st->l2.l2l1(st, PH_PULL | INDICATION, skb);
- test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
- if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) {
- FsmDelTimer(&st->l2.t203, 13);
- FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
- }
- if (skb_queue_len(&l2->i_queue) && cansend(st))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- }
- static void
- l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- int PollFlag, rsp, rnr = 0;
- unsigned int nr;
- struct Layer2 *l2 = &st->l2;
- rsp = *skb->data & 0x2;
- if (test_bit(FLG_ORIG, &l2->flag))
- rsp = !rsp;
- skb_pull(skb, l2addrsize(l2));
- if (IsRNR(skb->data, st)) {
- set_peer_busy(l2);
- rnr = 1;
- } else
- clear_peer_busy(l2);
- if (test_bit(FLG_MOD128, &l2->flag)) {
- PollFlag = (skb->data[1] & 0x1) == 0x1;
- nr = skb->data[1] >> 1;
- } else {
- PollFlag = (skb->data[0] & 0x10);
- nr = (skb->data[0] >> 5) & 0x7;
- }
- FreeSkb(skb);
- if (rsp && PollFlag) {
- if (legalnr(st, nr)) {
- if (rnr) {
- restart_t200(st, 15);
- } else {
- stop_t200(st, 16);
- FsmAddTimer(&l2->t203, l2->T203,
- EV_L2_T203, NULL, 5);
- setva(st, nr);
- }
- invoke_retransmission(st, nr);
- FsmChangeState(fi, ST_L2_7);
- if (skb_queue_len(&l2->i_queue) && cansend(st))
- st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
- } else
- nrerrorrecovery(fi);
- } else {
- if (!rsp && PollFlag)
- enquiry_response(st);
- if (legalnr(st, nr)) {
- setva(st, nr);
- } else
- nrerrorrecovery(fi);
- }
- }
- static void
- l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- struct sk_buff *skb = arg;
- skb_pull(skb, l2addrsize(&st->l2) + 1);
- if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */
- (IsUA(skb->data) && (fi->state == ST_L2_7))) {
- st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K');
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- }
- FreeSkb(skb);
- }
- static void
- l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.ui_queue);
- st->l2.tei = -1;
- FsmChangeState(fi, ST_L2_1);
- }
- static void
- l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.ui_queue);
- st->l2.tei = -1;
- st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
- FsmChangeState(fi, ST_L2_1);
- }
- static void
- l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- freewin(st);
- st->l2.tei = -1;
- stop_t200(st, 17);
- st5_dl_release_l2l3(st);
- FsmChangeState(fi, ST_L2_1);
- }
- static void
- l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.ui_queue);
- st->l2.tei = -1;
- stop_t200(st, 18);
- st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
- FsmChangeState(fi, ST_L2_1);
- }
- static void
- l2_tei_remove(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- freewin(st);
- st->l2.tei = -1;
- stop_t200(st, 17);
- FsmDelTimer(&st->l2.t203, 19);
- st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
- FsmChangeState(fi, ST_L2_1);
- }
- static void
- l2_st14_persistant_da(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
-
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
- st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
- }
- static void
- l2_st5_persistant_da(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- freewin(st);
- stop_t200(st, 19);
- st5_dl_release_l2l3(st);
- FsmChangeState(fi, ST_L2_4);
- }
- static void
- l2_st6_persistant_da(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.ui_queue);
- stop_t200(st, 20);
- st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
- FsmChangeState(fi, ST_L2_4);
- }
- static void
- l2_persistant_da(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- freewin(st);
- stop_t200(st, 19);
- FsmDelTimer(&st->l2.t203, 19);
- st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
- FsmChangeState(fi, ST_L2_4);
- }
- static void
- l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if(!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) {
- enquiry_cr(st, RNR, RSP, 0);
- test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
- }
- }
- static void
- l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- if(!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) {
- enquiry_cr(st, RR, RSP, 0);
- test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
- }
- }
- static void
- l2_frame_error(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- st->ma.layer(st, MDL_ERROR | INDICATION, arg);
- }
- static void
- l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
- {
- struct PStack *st = fi->userdata;
- st->ma.layer(st, MDL_ERROR | INDICATION, arg);
- establishlink(fi);
- test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
- }
- static struct FsmNode L2FnList[] __initdata =
- {
- {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
- {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
- {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
- {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
- {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
- {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
- {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
- {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
- {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
- {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
- {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
- {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
- {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
- {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign},
- {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui},
- {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui},
- {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui},
- {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui},
- {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui},
- {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui},
- {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui},
- {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
- {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
- {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
- {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
- {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
- {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
- {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
- {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
- {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
- {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
- {ST_L2_4, EV_L2_SABME, l2_start_multi},
- {ST_L2_5, EV_L2_SABME, l2_send_UA},
- {ST_L2_6, EV_L2_SABME, l2_send_DM},
- {ST_L2_7, EV_L2_SABME, l2_restart_multi},
- {ST_L2_8, EV_L2_SABME, l2_restart_multi},
- {ST_L2_4, EV_L2_DISC, l2_send_DM},
- {ST_L2_5, EV_L2_DISC, l2_send_DM},
- {ST_L2_6, EV_L2_DISC, l2_send_UA},
- {ST_L2_7, EV_L2_DISC, l2_stop_multi},
- {ST_L2_8, EV_L2_DISC, l2_stop_multi},
- {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
- {ST_L2_5, EV_L2_UA, l2_connected},
- {ST_L2_6, EV_L2_UA, l2_released},
- {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
- {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
- {ST_L2_4, EV_L2_DM, l2_reestablish},
- {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
- {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
- {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
- {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
- {ST_L2_1, EV_L2_UI, l2_got_ui},
- {ST_L2_2, EV_L2_UI, l2_got_ui},
- {ST_L2_3, EV_L2_UI, l2_got_ui},
- {ST_L2_4, EV_L2_UI, l2_got_ui},
- {ST_L2_5, EV_L2_UI, l2_got_ui},
- {ST_L2_6, EV_L2_UI, l2_got_ui},
- {ST_L2_7, EV_L2_UI, l2_got_ui},
- {ST_L2_8, EV_L2_UI, l2_got_ui},
- {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
- {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
- {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
- {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
- {ST_L2_7, EV_L2_I, l2_got_iframe},
- {ST_L2_8, EV_L2_I, l2_got_iframe},
- {ST_L2_5, EV_L2_T200, l2_st5_tout_200},
- {ST_L2_6, EV_L2_T200, l2_st6_tout_200},
- {ST_L2_7, EV_L2_T200, l2_st7_tout_200},
- {ST_L2_8, EV_L2_T200, l2_st8_tout_200},
- {ST_L2_7, EV_L2_T203, l2_st7_tout_203},
- {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
- {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
- {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
- {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
- {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
- {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
- {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
- {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
- {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
- {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
- {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistant_da},
- {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
- {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
- {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistant_da},
- {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistant_da},
- {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistant_da},
- {ST_L2_7, EV_L1_DEACTIVATE, l2_persistant_da},
- {ST_L2_8, EV_L1_DEACTIVATE, l2_persistant_da},
- };
- #define L2_FN_COUNT (sizeof(L2FnList)/sizeof(struct FsmNode))
- static void
- isdnl2_l1l2(struct PStack *st, int pr, void *arg)
- {
- struct sk_buff *skb = arg;
- u_char *datap;
- int ret = 1, len;
- int c = 0;
- switch (pr) {
- case (PH_DATA | INDICATION):
- datap = skb->data;
- len = l2addrsize(&st->l2);
- if (skb->len > len)
- datap += len;
- else {
- FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N');
- FreeSkb(skb);
- return;
- }
- if (!(*datap & 1)) { /* I-Frame */
- if(!(c = iframe_error(st, skb)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb);
- } else if (IsSFrame(datap, st)) { /* S-Frame */
- if(!(c = super_error(st, skb)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb);
- } else if (IsUI(datap)) {
- if(!(c = UI_error(st, skb)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb);
- } else if (IsSABME(datap, st)) {
- if(!(c = unnum_error(st, skb, CMD)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb);
- } else if (IsUA(datap)) {
- if(!(c = unnum_error(st, skb, RSP)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb);
- } else if (IsDISC(datap)) {
- if(!(c = unnum_error(st, skb, CMD)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb);
- } else if (IsDM(datap)) {
- if(!(c = unnum_error(st, skb, RSP)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb);
- } else if (IsFRMR(datap)) {
- if(!(c = FRMR_error(st,skb)))
- ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb);
- } else {
- FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L');
- FreeSkb(skb);
- ret = 0;
- }
- if(c) {
- FreeSkb(skb);
- FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
- ret = 0;
- }
- if (ret)
- FreeSkb(skb);
- break;
- case (PH_PULL | CONFIRM):
- FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg);
- break;
- case (PH_PAUSE | INDICATION):
- test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag);
- break;
- case (PH_PAUSE | CONFIRM):
- test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag);
- break;
- case (PH_ACTIVATE | CONFIRM):
- case (PH_ACTIVATE | INDICATION):
- test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag);
- if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
- FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
- break;
- case (PH_DEACTIVATE | INDICATION):
- case (PH_DEACTIVATE | CONFIRM):
- test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag);
- FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg);
- break;
- default:
- l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr);
- break;
- }
- }
- static void
- isdnl2_l3l2(struct PStack *st, int pr, void *arg)
- {
- switch (pr) {
- case (DL_DATA | REQUEST):
- if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) {
- dev_kfree_skb((struct sk_buff *) arg);
- }
- break;
- case (DL_UNIT_DATA | REQUEST):
- if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) {
- dev_kfree_skb((struct sk_buff *) arg);
- }
- break;
- case (DL_ESTABLISH | REQUEST):
- if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) {
- if (test_bit(FLG_LAPD, &st->l2.flag) ||
- test_bit(FLG_ORIG, &st->l2.flag)) {
- FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
- }
- } else {
- if (test_bit(FLG_LAPD, &st->l2.flag) ||
- test_bit(FLG_ORIG, &st->l2.flag)) {
- test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag);
- }
- st->l2.l2l1(st, PH_ACTIVATE, NULL);
- }
- break;
- case (DL_RELEASE | REQUEST):
- if (test_bit(FLG_LAPB, &st->l2.flag)) {
- st->l2.l2l1(st, PH_DEACTIVATE, NULL);
- }
- FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg);
- break;
- case (MDL_ASSIGN | REQUEST):
- FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg);
- break;
- case (MDL_REMOVE | REQUEST):
- FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg);
- break;
- case (MDL_ERROR | RESPONSE):
- FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg);
- break;
- }
- }
- void
- releasestack_isdnl2(struct PStack *st)
- {
- FsmDelTimer(&st->l2.t200, 21);
- FsmDelTimer(&st->l2.t203, 16);
- skb_queue_purge(&st->l2.i_queue);
- skb_queue_purge(&st->l2.ui_queue);
- ReleaseWin(&st->l2);
- }
- static void
- l2m_debug(struct FsmInst *fi, char *fmt, ...)
- {
- va_list args;
- struct PStack *st = fi->userdata;
- va_start(args, fmt);
- VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args);
- va_end(args);
- }
- void
- setstack_isdnl2(struct PStack *st, char *debug_id)
- {
- st->l1.l1l2 = isdnl2_l1l2;
- st->l3.l3l2 = isdnl2_l3l2;
- skb_queue_head_init(&st->l2.i_queue);
- skb_queue_head_init(&st->l2.ui_queue);
- InitWin(&st->l2);
- st->l2.debug = 0;
- st->l2.l2m.fsm = &l2fsm;
- if (test_bit(FLG_LAPB, &st->l2.flag))
- st->l2.l2m.state = ST_L2_4;
- else
- st->l2.l2m.state = ST_L2_1;
- st->l2.l2m.debug = 0;
- st->l2.l2m.userdata = st;
- st->l2.l2m.userint = 0;
- st->l2.l2m.printdebug = l2m_debug;
- strcpy(st->l2.debug_id, debug_id);
- FsmInitTimer(&st->l2.l2m, &st->l2.t200);
- FsmInitTimer(&st->l2.l2m, &st->l2.t203);
- }
- static void
- transl2_l3l2(struct PStack *st, int pr, void *arg)
- {
- switch (pr) {
- case (DL_DATA | REQUEST):
- case (DL_UNIT_DATA | REQUEST):
- st->l2.l2l1(st, PH_DATA | REQUEST, arg);
- break;
- case (DL_ESTABLISH | REQUEST):
- st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL);
- break;
- case (DL_RELEASE | REQUEST):
- st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
- break;
- }
- }
- void
- setstack_transl2(struct PStack *st)
- {
- st->l3.l3l2 = transl2_l3l2;
- }
- void
- releasestack_transl2(struct PStack *st)
- {
- }
- int __init
- Isdnl2New(void)
- {
- l2fsm.state_count = L2_STATE_COUNT;
- l2fsm.event_count = L2_EVENT_COUNT;
- l2fsm.strEvent = strL2Event;
- l2fsm.strState = strL2State;
- return FsmNew(&l2fsm, L2FnList, L2_FN_COUNT);
- }
- void
- Isdnl2Free(void)
- {
- FsmFree(&l2fsm);
- }