--- /dev/null
+/* $Id: isdnl2.c,v 2.30.2.4 2004/02/11 13:21:34 keil 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
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include "hisax.h"
+#include "isdnl2.h"
+
+const char *l2_revision = "$Revision: 2.30.2.4 $";
+
+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_empty(&l2->i_queue) ||
+ !skb_queue_empty(&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;
+}
+
+static 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 release\n", cnt);
+}
+
+static 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));
+}
+
+static 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);
+}
+
+static 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);
+ }
+}
+
+static inline 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)
+
+static inline int
+IsUI(u_char *data)
+{
+ return ((data[0] & 0xef) == UI);
+}
+
+static inline int
+IsUA(u_char *data)
+{
+ return ((data[0] & 0xef) == UA);
+}
+
+static inline int
+IsDM(u_char *data)
+{
+ return ((data[0] & 0xef) == DM);
+}
+
+static inline int
+IsDISC(u_char *data)
+{
+ return ((data[0] & 0xef) == DISC);
+}
+
+static 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));
+}
+
+static 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);
+}
+
+static inline int
+IsREJ(u_char *data, struct PStack *st)
+{
+ return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
+}
+
+static inline int
+IsFRMR(u_char *data)
+{
+ return ((data[0] & 0xef) == FRMR);
+}
+
+static inline int
+IsRNR(u_char *data, struct PStack *st)
+{
+ return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static 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;
+ u_long flags;
+
+ spin_lock_irqsave(&l2->lock, flags);
+ 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;
+ spin_unlock_irqrestore(&l2->lock, flags);
+ if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >= 0))
+ lli_writewakeup(st, len);
+ spin_lock_irqsave(&l2->lock, flags);
+ }
+ spin_unlock_irqrestore(&l2->lock, flags);
+}
+
+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_uframe\n");
+ return;
+ }
+ memcpy(skb_put(skb, i), tmp, i);
+ enqueue_super(st, skb);
+}
+
+static inline u_char
+get_PollFlag(struct PStack *st, struct sk_buff *skb)
+{
+ return (skb->data[l2addrsize(&(st->l2))] & 0x10);
+}
+
+static inline u_char
+get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
+{
+ u_char PF;
+
+ PF = get_PollFlag(st, skb);
+ dev_kfree_skb(skb);
+ return (PF);
+}
+
+static 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);
+}
+
+static 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);
+}
+
+static 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);
+}
+
+static 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);
+}
+
+static 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_empty(&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;
+ }
+ dev_kfree_skb(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_empty(&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;
+ }
+ dev_kfree_skb(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);
+ }
+}
+
+static 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_cr\n");
+ return;
+ }
+ memcpy(skb_put(skb, i), tmp, i);
+ enqueue_super(st, skb);
+}
+
+static 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);
+}
+
+static 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;
+ u_int p1;
+ u_long flags;
+
+ spin_lock_irqsave(&l2->lock, flags);
+ 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;
+ }
+ spin_unlock_irqrestore(&l2->lock, flags);
+ st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+ return;
+ }
+ spin_unlock_irqrestore(&l2->lock, flags);
+}
+
+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;
+ }
+ dev_kfree_skb(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_empty(&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
+ dev_kfree_skb(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)) {
+ dev_kfree_skb(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) */
+ dev_kfree_skb(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_empty(&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_empty(&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;
+ struct Layer2 *l2 = &st->l2;
+ u_char header[MAX_HEADER_LEN];
+ int i, hdr_space_needed;
+ int unsigned p1;
+ u_long flags;
+
+ if (!cansend(st))
+ return;
+
+ skb = skb_dequeue(&l2->i_queue);
+ if (!skb)
+ return;
+
+ hdr_space_needed = l2headersize(l2, 0);
+ if (hdr_space_needed > skb_headroom(skb)) {
+ struct sk_buff *orig_skb = skb;
+
+ skb = skb_realloc_headroom(skb, hdr_space_needed);
+ if (!skb) {
+ dev_kfree_skb(orig_skb);
+ return;
+ }
+ }
+ spin_lock_irqsave(&l2->lock, flags);
+ 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 %d\n",
+ 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;
+ }
+ spin_unlock_irqrestore(&l2->lock, flags);
+ memcpy(skb_push(skb, i), header, i);
+ 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_empty(&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;
+ }
+ dev_kfree_skb(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_empty(&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);
+ }
+ dev_kfree_skb(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_persistent_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_persistent_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_persistent_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_persistent_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_persistent_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_persistent_da},
+ {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
+ {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
+ {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
+ {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
+};
+
+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');
+ dev_kfree_skb(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');
+ dev_kfree_skb(skb);
+ ret = 0;
+ }
+ if (c) {
+ dev_kfree_skb(skb);
+ FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
+ ret = 0;
+ }
+ if (ret)
+ dev_kfree_skb(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)
+{
+ spin_lock_init(&st->l2.lock);
+ 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, ARRAY_SIZE(L2FnList));
+}
+
+void
+Isdnl2Free(void)
+{
+ FsmFree(&l2fsm);
+}
Code Review / kvmfornfv.git / blobdiff