// SPDX-License-Identifier: GPL-2.0-only /* * * Author Karsten Keil <kkeil@novell.com> * * Copyright 2008 by Karsten Keil <kkeil@novell.com> */ #include <linux/mISDNif.h> #include <linux/slab.h> #include "core.h" #include "fsm.h" #include "layer2.h" static u_int *debug; static struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL}; 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_UNITDATA, 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_T200I, EV_L2_T203I, 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_UNITDATA", "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_T200I", "EV_L2_T203I", "EV_L2_SET_OWN_BUSY", "EV_L2_CLEAR_OWN_BUSY", "EV_L2_FRAME_ERROR", }; static void l2m_debug(struct FsmInst *fi, char *fmt, ...) { struct layer2 *l2 = fi->userdata; struct va_format vaf; va_list va; if (!(*debug & DEBUG_L2_FSM)) return; va_start(va, fmt); vaf.fmt = fmt; vaf.va = &va; printk(KERN_DEBUG "%s l2 (sapi %d tei %d): %pV\n", mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, &vaf); va_end(va); } inline u_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 u_int l2addrsize(struct layer2 *l2) { return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1; } static u_int l2_newid(struct layer2 *l2) { u_int id; id = l2->next_id++; if (id == 0x7fff) l2->next_id = 1; id <<= 16; id |= l2->tei << 8; id |= l2->sapi; return id; } static void l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb) { int err; if (!l2->up) return; mISDN_HEAD_PRIM(skb) = prim; mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr; err = l2->up->send(l2->up, skb); if (err) { printk(KERN_WARNING "%s: dev %s err=%d\n", __func__, mISDNDevName4ch(&l2->ch), err); dev_kfree_skb(skb); } } static void l2up_create(struct layer2 *l2, u_int prim, int len, void *arg) { struct sk_buff *skb; struct mISDNhead *hh; int err; if (!l2->up) return; skb = mI_alloc_skb(len, GFP_ATOMIC); if (!skb) return; hh = mISDN_HEAD_P(skb); hh->prim = prim; hh->id = (l2->ch.nr << 16) | l2->ch.addr; if (len) skb_put_data(skb, arg, len); err = l2->up->send(l2->up, skb); if (err) { printk(KERN_WARNING "%s: dev %s err=%d\n", __func__, mISDNDevName4ch(&l2->ch), err); dev_kfree_skb(skb); } } static int l2down_skb(struct layer2 *l2, struct sk_buff *skb) { int ret; ret = l2->ch.recv(l2->ch.peer, skb); if (ret && (*debug & DEBUG_L2_RECV)) printk(KERN_DEBUG "l2down_skb: dev %s ret(%d)\n", mISDNDevName4ch(&l2->ch), ret); return ret; } static int l2down_raw(struct layer2 *l2, struct sk_buff *skb) { struct mISDNhead *hh = mISDN_HEAD_P(skb); if (hh->prim == PH_DATA_REQ) { if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) { skb_queue_tail(&l2->down_queue, skb); return 0; } l2->down_id = mISDN_HEAD_ID(skb); } return l2down_skb(l2, skb); } static int l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb) { struct mISDNhead *hh = mISDN_HEAD_P(skb); hh->prim = prim; hh->id = id; return l2down_raw(l2, skb); } static int l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg) { struct sk_buff *skb; int err; struct mISDNhead *hh; skb = mI_alloc_skb(len, GFP_ATOMIC); if (!skb) return -ENOMEM; hh = mISDN_HEAD_P(skb); hh->prim = prim; hh->id = id; if (len) skb_put_data(skb, arg, len); err = l2down_raw(l2, skb); if (err) dev_kfree_skb(skb); return err; } static int ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) { struct sk_buff *nskb = skb; int ret = -EAGAIN; if (test_bit(FLG_L1_NOTREADY, &l2->flag)) { if (hh->id == l2->down_id) { nskb = skb_dequeue(&l2->down_queue); if (nskb) { l2->down_id = mISDN_HEAD_ID(nskb); if (l2down_skb(l2, nskb)) { dev_kfree_skb(nskb); l2->down_id = MISDN_ID_NONE; } } else l2->down_id = MISDN_ID_NONE; if (ret) { dev_kfree_skb(skb); ret = 0; } if (l2->down_id == MISDN_ID_NONE) { test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL); } } } if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) { nskb = skb_dequeue(&l2->down_queue); if (nskb) { l2->down_id = mISDN_HEAD_ID(nskb); if (l2down_skb(l2, nskb)) { dev_kfree_skb(nskb); l2->down_id = MISDN_ID_NONE; test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); } } else test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); } return ret; } static void l2_timeout(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb; struct mISDNhead *hh; skb = mI_alloc_skb(0, GFP_ATOMIC); if (!skb) { printk(KERN_WARNING "%s: L2(%d,%d) nr:%x timer %s no skb\n", mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203"); return; } hh = mISDN_HEAD_P(skb); hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND; hh->id = l2->ch.nr; if (*debug & DEBUG_TIMER) printk(KERN_DEBUG "%s: L2(%d,%d) nr:%x timer %s expired\n", mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203"); if (l2->ch.st) l2->ch.st->own.recv(&l2->ch.st->own, skb); } static int l2mgr(struct layer2 *l2, u_int prim, void *arg) { long c = (long)arg; printk(KERN_WARNING "l2mgr: dev %s addr:%x prim %x %c\n", mISDNDevName4ch(&l2->ch), l2->id, prim, (char)c); if (test_bit(FLG_LAPD, &l2->flag) && !test_bit(FLG_FIXED_TEI, &l2->flag)) { switch (c) { case 'C': case 'D': case 'G': case 'H': l2_tei(l2, prim, (u_long)arg); break; } } return 0; } 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 freewin(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 void ReleaseWin(struct layer2 *l2) { int cnt = freewin(l2); if (cnt) printk(KERN_WARNING "isdnl2 freed %d skbuffs in release\n", cnt); } inline unsigned int cansend(struct layer2 *l2) { unsigned int p1; if (test_bit(FLG_MOD128, &l2->flag)) p1 = (l2->vs - l2->va) % 128; else p1 = (l2->vs - l2->va) % 8; return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &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); } 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)) { if (test_bit(FLG_LAPD_NET, &l2->flag)) crbit = !crbit; *ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0); *ptr++ = (l2->tei << 1) | 1; return 2; } else { if (test_bit(FLG_ORIG, &l2->flag)) crbit = !crbit; if (crbit) *ptr++ = l2->addr.B; else *ptr++ = l2->addr.A; return 1; } } static inline void enqueue_super(struct layer2 *l2, struct sk_buff *skb) { if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb)) dev_kfree_skb(skb); } static inline void enqueue_ui(struct layer2 *l2, struct sk_buff *skb) { if (l2->tm) l2_tei(l2, MDL_STATUS_UI_IND, 0); if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb)) dev_kfree_skb(skb); } 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 layer2 *l2) { if (test_bit(FLG_MOD128, &l2->flag)) return data[0] == RR; else return (data[0] & 0xf) == 1; } inline int IsSFrame(u_char *data, struct layer2 *l2) { register u_char d = *data; if (!test_bit(FLG_MOD128, &l2->flag)) d &= 0xf; return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c); } inline int IsSABME(u_char *data, struct layer2 *l2) { u_char d = data[0] & ~0x10; return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM; } inline int IsREJ(u_char *data, struct layer2 *l2) { return test_bit(FLG_MOD128, &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 layer2 *l2) { return test_bit(FLG_MOD128, &l2->flag) ? data[0] == RNR : (data[0] & 0xf) == RNR; } static int iframe_error(struct layer2 *l2, struct sk_buff *skb) { u_int i; int rsp = *skb->data & 0x2; i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1); if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; if (rsp) return 'L'; if (skb->len < i) return 'N'; if ((skb->len - i) > l2->maxlen) return 'O'; return 0; } static int super_error(struct layer2 *l2, struct sk_buff *skb) { if (skb->len != l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1)) return 'N'; return 0; } static int unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp) { int rsp = (*skb->data & 0x2) >> 1; if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; if (rsp != wantrsp) return 'L'; if (skb->len != l2addrsize(l2) + 1) return 'N'; return 0; } static int UI_error(struct layer2 *l2, struct sk_buff *skb) { int rsp = *skb->data & 0x2; if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; if (rsp) return 'L'; if (skb->len > l2->maxlen + l2addrsize(l2) + 1) return 'O'; return 0; } static int FRMR_error(struct layer2 *l2, struct sk_buff *skb) { u_int headers = l2addrsize(l2) + 1; u_char *datap = skb->data + headers; int rsp = *skb->data & 0x2; if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; if (!rsp) return 'L'; if (test_bit(FLG_MOD128, &l2->flag)) { if (skb->len < headers + 5) return 'N'; else if (*debug & DEBUG_L2) l2m_debug(&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 if (*debug & DEBUG_L2) l2m_debug(&l2->l2m, "FRMR information %2x %2x %2x", datap[0], datap[1], datap[2]); } return 0; } static unsigned int legalnr(struct layer2 *l2, unsigned int nr) { 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 layer2 *l2, unsigned int nr) { struct sk_buff *skb; while (l2->va != nr) { l2->va++; if (test_bit(FLG_MOD128, &l2->flag)) l2->va %= 128; else l2->va %= 8; if (l2->windowar[l2->sow]) { skb_trim(l2->windowar[l2->sow], 0); skb_queue_tail(&l2->tmp_queue, l2->windowar[l2->sow]); l2->windowar[l2->sow] = NULL; } l2->sow = (l2->sow + 1) % l2->window; } skb = skb_dequeue(&l2->tmp_queue); while (skb) { dev_kfree_skb(skb); skb = skb_dequeue(&l2->tmp_queue); } } static void send_uframe(struct layer2 *l2, struct sk_buff *skb, u_char cmd, u_char cr) { u_char tmp[MAX_L2HEADER_LEN]; int i; i = sethdraddr(l2, tmp, cr); tmp[i++] = cmd; if (skb) skb_trim(skb, 0); else { skb = mI_alloc_skb(i, GFP_ATOMIC); if (!skb) { printk(KERN_WARNING "%s: can't alloc skbuff in %s\n", mISDNDevName4ch(&l2->ch), __func__); return; } } skb_put_data(skb, tmp, i); enqueue_super(l2, skb); } inline u_char get_PollFlag(struct layer2 *l2, struct sk_buff *skb) { return skb->data[l2addrsize(l2)] & 0x10; } inline u_char get_PollFlagFree(struct layer2 *l2, struct sk_buff *skb) { u_char PF; PF = get_PollFlag(l2, skb); dev_kfree_skb(skb); return PF; } inline void start_t200(struct layer2 *l2, int i) { mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i); test_and_set_bit(FLG_T200_RUN, &l2->flag); } inline void restart_t200(struct layer2 *l2, int i) { mISDN_FsmRestartTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i); test_and_set_bit(FLG_T200_RUN, &l2->flag); } inline void stop_t200(struct layer2 *l2, int i) { if (test_and_clear_bit(FLG_T200_RUN, &l2->flag)) mISDN_FsmDelTimer(&l2->t200, i); } inline void st5_dl_release_l2l3(struct layer2 *l2) { int pr; if (test_and_clear_bit(FLG_PEND_REL, &l2->flag)) pr = DL_RELEASE_CNF; else pr = DL_RELEASE_IND; l2up_create(l2, pr, 0, NULL); } inline void lapb_dl_release_l2l3(struct layer2 *l2, int f) { if (test_bit(FLG_LAPB, &l2->flag)) l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL); l2up_create(l2, f, 0, NULL); } static void establishlink(struct FsmInst *fi) { struct layer2 *l2 = fi->userdata; u_char cmd; clear_exception(l2); l2->rc = 0; cmd = (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10; send_uframe(l2, NULL, cmd, CMD); mISDN_FsmDelTimer(&l2->t203, 1); restart_t200(l2, 1); test_and_clear_bit(FLG_PEND_REL, &l2->flag); freewin(l2); mISDN_FsmChangeState(fi, ST_L2_5); } static void l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; if (get_PollFlagFree(l2, skb)) l2mgr(l2, MDL_ERROR_IND, (void *) 'C'); else l2mgr(l2, MDL_ERROR_IND, (void *) 'D'); } static void l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; if (get_PollFlagFree(l2, skb)) l2mgr(l2, MDL_ERROR_IND, (void *) 'B'); else { l2mgr(l2, MDL_ERROR_IND, (void *) 'E'); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } } static void l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; if (get_PollFlagFree(l2, skb)) l2mgr(l2, MDL_ERROR_IND, (void *) 'B'); else l2mgr(l2, MDL_ERROR_IND, (void *) 'E'); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } static void l2_go_st3(struct FsmInst *fi, int event, void *arg) { dev_kfree_skb((struct sk_buff *)arg); mISDN_FsmChangeState(fi, ST_L2_3); } static void l2_mdl_assign(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; mISDN_FsmChangeState(fi, ST_L2_3); dev_kfree_skb((struct sk_buff *)arg); l2_tei(l2, MDL_ASSIGN_IND, 0); } static void l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_tail(&l2->ui_queue, skb); mISDN_FsmChangeState(fi, ST_L2_2); l2_tei(l2, MDL_ASSIGN_IND, 0); } static void l2_queue_ui(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_tail(&l2->ui_queue, skb); } static void tx_ui(struct layer2 *l2) { struct sk_buff *skb; u_char header[MAX_L2HEADER_LEN]; int i; i = sethdraddr(l2, header, CMD); if (test_bit(FLG_LAPD_NET, &l2->flag)) header[1] = 0xff; /* tei 127 */ header[i++] = UI; while ((skb = skb_dequeue(&l2->ui_queue))) { memcpy(skb_push(skb, i), header, i); enqueue_ui(l2, skb); } } static void l2_send_ui(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_tail(&l2->ui_queue, skb); tx_ui(l2); } static void l2_got_ui(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_pull(skb, l2headersize(l2, 1)); /* * in states 1-3 for broadcast */ if (l2->tm) l2_tei(l2, MDL_STATUS_UI_IND, 0); l2up(l2, DL_UNITDATA_IND, skb); } static void l2_establish(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; establishlink(fi); test_and_set_bit(FLG_L3_INIT, &l2->flag); dev_kfree_skb(skb); } static void l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->i_queue); test_and_set_bit(FLG_L3_INIT, &l2->flag); test_and_clear_bit(FLG_PEND_REL, &l2->flag); dev_kfree_skb(skb); } static void l2_l3_reestablish(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->i_queue); establishlink(fi); test_and_set_bit(FLG_L3_INIT, &l2->flag); dev_kfree_skb(skb); } static void l2_release(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_trim(skb, 0); l2up(l2, DL_RELEASE_CNF, skb); } static void l2_pend_rel(struct FsmInst *fi, int event, void *arg) { struct sk_buff *skb = arg; struct layer2 *l2 = fi->userdata; test_and_set_bit(FLG_PEND_REL, &l2->flag); dev_kfree_skb(skb); } static void l2_disconnect(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_purge(&l2->i_queue); freewin(l2); mISDN_FsmChangeState(fi, ST_L2_6); l2->rc = 0; send_uframe(l2, NULL, DISC | 0x10, CMD); mISDN_FsmDelTimer(&l2->t203, 1); restart_t200(l2, 2); dev_kfree_skb(skb); } static void l2_start_multi(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; l2->vs = 0; l2->va = 0; l2->vr = 0; l2->sow = 0; clear_exception(l2); send_uframe(l2, NULL, UA | get_PollFlag(l2, skb), RSP); mISDN_FsmChangeState(fi, ST_L2_7); mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3); skb_trim(skb, 0); l2up(l2, DL_ESTABLISH_IND, skb); if (l2->tm) l2_tei(l2, MDL_STATUS_UP_IND, 0); } static void l2_send_UA(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); } static void l2_send_DM(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; send_uframe(l2, skb, DM | get_PollFlag(l2, skb), RSP); } static void l2_restart_multi(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; int est = 0; send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); l2mgr(l2, MDL_ERROR_IND, (void *) 'F'); if (l2->vs != l2->va) { skb_queue_purge(&l2->i_queue); est = 1; } clear_exception(l2); l2->vs = 0; l2->va = 0; l2->vr = 0; l2->sow = 0; mISDN_FsmChangeState(fi, ST_L2_7); stop_t200(l2, 3); mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3); if (est) l2up_create(l2, DL_ESTABLISH_IND, 0, NULL); /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST, * MGR_SHORTSTATUS | INDICATION, SSTATUS_L2_ESTABLISHED, * 0, NULL, 0); */ if (skb_queue_len(&l2->i_queue) && cansend(l2)) mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); } static void l2_stop_multi(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; mISDN_FsmChangeState(fi, ST_L2_4); mISDN_FsmDelTimer(&l2->t203, 3); stop_t200(l2, 4); send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); skb_queue_purge(&l2->i_queue); freewin(l2); lapb_dl_release_l2l3(l2, DL_RELEASE_IND); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } static void l2_connected(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; int pr = -1; if (!get_PollFlag(l2, skb)) { l2_mdl_error_ua(fi, event, arg); return; } dev_kfree_skb(skb); if (test_and_clear_bit(FLG_PEND_REL, &l2->flag)) l2_disconnect(fi, event, NULL); if (test_and_clear_bit(FLG_L3_INIT, &l2->flag)) { pr = DL_ESTABLISH_CNF; } else if (l2->vs != l2->va) { skb_queue_purge(&l2->i_queue); pr = DL_ESTABLISH_IND; } stop_t200(l2, 5); l2->vr = 0; l2->vs = 0; l2->va = 0; l2->sow = 0; mISDN_FsmChangeState(fi, ST_L2_7); mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 4); if (pr != -1) l2up_create(l2, pr, 0, NULL); if (skb_queue_len(&l2->i_queue) && cansend(l2)) mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); if (l2->tm) l2_tei(l2, MDL_STATUS_UP_IND, 0); } static void l2_released(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (!get_PollFlag(l2, skb)) { l2_mdl_error_ua(fi, event, arg); return; } dev_kfree_skb(skb); stop_t200(l2, 6); lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } static void l2_reestablish(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (!get_PollFlagFree(l2, skb)) { establishlink(fi); test_and_set_bit(FLG_L3_INIT, &l2->flag); } } static void l2_st5_dm_release(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (get_PollFlagFree(l2, skb)) { stop_t200(l2, 7); if (!test_bit(FLG_L3_INIT, &l2->flag)) skb_queue_purge(&l2->i_queue); if (test_bit(FLG_LAPB, &l2->flag)) l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL); st5_dl_release_l2l3(l2); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } } static void l2_st6_dm_release(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (get_PollFlagFree(l2, skb)) { stop_t200(l2, 8); lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } } static void enquiry_cr(struct layer2 *l2, u_char typ, u_char cr, u_char pf) { struct sk_buff *skb; u_char tmp[MAX_L2HEADER_LEN]; int i; 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); skb = mI_alloc_skb(i, GFP_ATOMIC); if (!skb) { printk(KERN_WARNING "%s: isdnl2 can't alloc sbbuff in %s\n", mISDNDevName4ch(&l2->ch), __func__); return; } skb_put_data(skb, tmp, i); enqueue_super(l2, skb); } inline void enquiry_response(struct layer2 *l2) { if (test_bit(FLG_OWN_BUSY, &l2->flag)) enquiry_cr(l2, RNR, RSP, 1); else enquiry_cr(l2, RR, RSP, 1); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); } inline void transmit_enquiry(struct layer2 *l2) { if (test_bit(FLG_OWN_BUSY, &l2->flag)) enquiry_cr(l2, RNR, CMD, 1); else enquiry_cr(l2, RR, CMD, 1); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); start_t200(l2, 9); } static void nrerrorrecovery(struct FsmInst *fi) { struct layer2 *l2 = fi->userdata; l2mgr(l2, MDL_ERROR_IND, (void *) 'J'); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } static void invoke_retransmission(struct layer2 *l2, unsigned int nr) { u_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 (l2->windowar[p1]) skb_queue_head(&l2->i_queue, l2->windowar[p1]); else printk(KERN_WARNING "%s: windowar[%d] is NULL\n", mISDNDevName4ch(&l2->ch), p1); l2->windowar[p1] = NULL; } mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL); } } static void l2_st7_got_super(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; int PollFlag, rsp, typ = RR; unsigned int nr; rsp = *skb->data & 0x2; if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; skb_pull(skb, l2addrsize(l2)); if (IsRNR(skb->data, l2)) { set_peer_busy(l2); typ = RNR; } else clear_peer_busy(l2); if (IsREJ(skb->data, l2)) 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) l2mgr(l2, MDL_ERROR_IND, (void *) 'A'); else enquiry_response(l2); } if (legalnr(l2, nr)) { if (typ == REJ) { setva(l2, nr); invoke_retransmission(l2, nr); stop_t200(l2, 10); if (mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 6)) l2m_debug(&l2->l2m, "Restart T203 ST7 REJ"); } else if ((nr == l2->vs) && (typ == RR)) { setva(l2, nr); stop_t200(l2, 11); mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 7); } else if ((l2->va != nr) || (typ == RNR)) { setva(l2, nr); if (typ != RR) mISDN_FsmDelTimer(&l2->t203, 9); restart_t200(l2, 12); } if (skb_queue_len(&l2->i_queue) && (typ == RR)) mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); } else nrerrorrecovery(fi); } static void l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (!test_bit(FLG_L3_INIT, &l2->flag)) skb_queue_tail(&l2->i_queue, skb); else dev_kfree_skb(skb); } static void l2_feed_i_pull(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_tail(&l2->i_queue, skb); mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); } static void l2_feed_iqueue(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_tail(&l2->i_queue, skb); } static void l2_got_iframe(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; int PollFlag, i; u_int ns, 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(l2); } 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(l2); else test_and_set_bit(FLG_ACK_PEND, &l2->flag); skb_pull(skb, l2headersize(l2, 0)); l2up(l2, DL_DATA_IND, skb); } else { /* n(s)!=v(r) */ dev_kfree_skb(skb); if (test_and_set_bit(FLG_REJEXC, &l2->flag)) { if (PollFlag) enquiry_response(l2); } else { enquiry_cr(l2, REJ, RSP, PollFlag); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); } } } if (legalnr(l2, nr)) { if (!test_bit(FLG_PEER_BUSY, &l2->flag) && (fi->state == ST_L2_7)) { if (nr == l2->vs) { stop_t200(l2, 13); mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 7); } else if (nr != l2->va) restart_t200(l2, 14); } setva(l2, nr); } else { nrerrorrecovery(fi); return; } if (skb_queue_len(&l2->i_queue) && (fi->state == ST_L2_7)) mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); if (test_and_clear_bit(FLG_ACK_PEND, &l2->flag)) enquiry_cr(l2, RR, RSP, 0); } static void l2_got_tei(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; u_int info; l2->tei = (signed char)(long)arg; set_channel_address(&l2->ch, l2->sapi, l2->tei); info = DL_INFO_L2_CONNECT; l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info); if (fi->state == ST_L2_3) { establishlink(fi); test_and_set_bit(FLG_L3_INIT, &l2->flag); } else mISDN_FsmChangeState(fi, ST_L2_4); if (skb_queue_len(&l2->ui_queue)) tx_ui(l2); } static void l2_st5_tout_200(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; if (test_bit(FLG_LAPD, &l2->flag) && test_bit(FLG_DCHAN_BUSY, &l2->flag)) { mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); } else if (l2->rc == l2->N200) { mISDN_FsmChangeState(fi, ST_L2_4); test_and_clear_bit(FLG_T200_RUN, &l2->flag); skb_queue_purge(&l2->i_queue); l2mgr(l2, MDL_ERROR_IND, (void *) 'G'); if (test_bit(FLG_LAPB, &l2->flag)) l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL); st5_dl_release_l2l3(l2); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } else { l2->rc++; mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); send_uframe(l2, NULL, (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10, CMD); } } static void l2_st6_tout_200(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; if (test_bit(FLG_LAPD, &l2->flag) && test_bit(FLG_DCHAN_BUSY, &l2->flag)) { mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); } else if (l2->rc == l2->N200) { mISDN_FsmChangeState(fi, ST_L2_4); test_and_clear_bit(FLG_T200_RUN, &l2->flag); l2mgr(l2, MDL_ERROR_IND, (void *) 'H'); lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } else { l2->rc++; mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); send_uframe(l2, NULL, DISC | 0x10, CMD); } } static void l2_st7_tout_200(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; if (test_bit(FLG_LAPD, &l2->flag) && test_bit(FLG_DCHAN_BUSY, &l2->flag)) { mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); return; } test_and_clear_bit(FLG_T200_RUN, &l2->flag); l2->rc = 0; mISDN_FsmChangeState(fi, ST_L2_8); transmit_enquiry(l2); l2->rc++; } static void l2_st8_tout_200(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; if (test_bit(FLG_LAPD, &l2->flag) && test_bit(FLG_DCHAN_BUSY, &l2->flag)) { mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); return; } test_and_clear_bit(FLG_T200_RUN, &l2->flag); if (l2->rc == l2->N200) { l2mgr(l2, MDL_ERROR_IND, (void *) 'I'); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } else { transmit_enquiry(l2); l2->rc++; } } static void l2_st7_tout_203(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; if (test_bit(FLG_LAPD, &l2->flag) && test_bit(FLG_DCHAN_BUSY, &l2->flag)) { mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 9); return; } mISDN_FsmChangeState(fi, ST_L2_8); transmit_enquiry(l2); l2->rc = 0; } static void l2_pull_iqueue(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb, *nskb; u_char header[MAX_L2HEADER_LEN]; u_int i, p1; if (!cansend(l2)) return; skb = skb_dequeue(&l2->i_queue); if (!skb) return; i = sethdraddr(l2, header, CMD); if (test_bit(FLG_MOD128, &l2->flag)) { header[i++] = l2->vs << 1; header[i++] = l2->vr << 1; } else header[i++] = (l2->vr << 5) | (l2->vs << 1); nskb = skb_realloc_headroom(skb, i); if (!nskb) { printk(KERN_WARNING "%s: no headroom(%d) copy for IFrame\n", mISDNDevName4ch(&l2->ch), i); skb_queue_head(&l2->i_queue, skb); return; } if (test_bit(FLG_MOD128, &l2->flag)) { p1 = (l2->vs - l2->va) % 128; l2->vs = (l2->vs + 1) % 128; } else { p1 = (l2->vs - l2->va) % 8; l2->vs = (l2->vs + 1) % 8; } p1 = (p1 + l2->sow) % l2->window; if (l2->windowar[p1]) { printk(KERN_WARNING "%s: l2 try overwrite ack queue entry %d\n", mISDNDevName4ch(&l2->ch), p1); dev_kfree_skb(l2->windowar[p1]); } l2->windowar[p1] = skb; memcpy(skb_push(nskb, i), header, i); l2down(l2, PH_DATA_REQ, l2_newid(l2), nskb); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); if (!test_and_set_bit(FLG_T200_RUN, &l2->flag)) { mISDN_FsmDelTimer(&l2->t203, 13); mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 11); } } static void l2_st8_got_super(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; int PollFlag, rsp, rnr = 0; unsigned int nr; rsp = *skb->data & 0x2; if (test_bit(FLG_ORIG, &l2->flag)) rsp = !rsp; skb_pull(skb, l2addrsize(l2)); if (IsRNR(skb->data, l2)) { 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(l2, nr)) { if (rnr) { restart_t200(l2, 15); } else { stop_t200(l2, 16); mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 5); setva(l2, nr); } invoke_retransmission(l2, nr); mISDN_FsmChangeState(fi, ST_L2_7); if (skb_queue_len(&l2->i_queue) && cansend(l2)) mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); } else nrerrorrecovery(fi); } else { if (!rsp && PollFlag) enquiry_response(l2); if (legalnr(l2, nr)) setva(l2, nr); else nrerrorrecovery(fi); } } static void l2_got_FRMR(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_pull(skb, l2addrsize(l2) + 1); if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */ (IsUA(skb->data) && (fi->state == ST_L2_7))) { l2mgr(l2, MDL_ERROR_IND, (void *) 'K'); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } dev_kfree_skb(skb); } static void l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->ui_queue); l2->tei = GROUP_TEI; mISDN_FsmChangeState(fi, ST_L2_1); } static void l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->ui_queue); l2->tei = GROUP_TEI; l2up_create(l2, DL_RELEASE_IND, 0, NULL); mISDN_FsmChangeState(fi, ST_L2_1); } static void l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); freewin(l2); l2->tei = GROUP_TEI; stop_t200(l2, 17); st5_dl_release_l2l3(l2); mISDN_FsmChangeState(fi, ST_L2_1); } static void l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->ui_queue); l2->tei = GROUP_TEI; stop_t200(l2, 18); l2up_create(l2, DL_RELEASE_IND, 0, NULL); mISDN_FsmChangeState(fi, ST_L2_1); } static void l2_tei_remove(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); freewin(l2); l2->tei = GROUP_TEI; stop_t200(l2, 17); mISDN_FsmDelTimer(&l2->t203, 19); l2up_create(l2, DL_RELEASE_IND, 0, NULL); /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST, * MGR_SHORTSTATUS_IND, SSTATUS_L2_RELEASED, * 0, NULL, 0); */ mISDN_FsmChangeState(fi, ST_L2_1); } static void l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag)) l2up(l2, DL_RELEASE_IND, skb); else dev_kfree_skb(skb); } static void l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); freewin(l2); stop_t200(l2, 19); st5_dl_release_l2l3(l2); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); dev_kfree_skb(skb); } static void l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_purge(&l2->ui_queue); stop_t200(l2, 20); l2up(l2, DL_RELEASE_CNF, skb); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } static void l2_persistent_da(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); freewin(l2); stop_t200(l2, 19); mISDN_FsmDelTimer(&l2->t203, 19); l2up(l2, DL_RELEASE_IND, skb); mISDN_FsmChangeState(fi, ST_L2_4); if (l2->tm) l2_tei(l2, MDL_STATUS_DOWN_IND, 0); } static void l2_set_own_busy(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (!test_and_set_bit(FLG_OWN_BUSY, &l2->flag)) { enquiry_cr(l2, RNR, RSP, 0); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); } dev_kfree_skb(skb); } static void l2_clear_own_busy(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; struct sk_buff *skb = arg; if (!test_and_clear_bit(FLG_OWN_BUSY, &l2->flag)) { enquiry_cr(l2, RR, RSP, 0); test_and_clear_bit(FLG_ACK_PEND, &l2->flag); } dev_kfree_skb(skb); } static void l2_frame_error(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; l2mgr(l2, MDL_ERROR_IND, arg); } static void l2_frame_error_reest(struct FsmInst *fi, int event, void *arg) { struct layer2 *l2 = fi->userdata; l2mgr(l2, MDL_ERROR_IND, arg); establishlink(fi); test_and_clear_bit(FLG_L3_INIT, &l2->flag); } static struct FsmNode L2FnList[] = { {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_UNITDATA, l2_queue_ui_assign}, {ST_L2_2, EV_L2_DL_UNITDATA, l2_queue_ui}, {ST_L2_3, EV_L2_DL_UNITDATA, l2_queue_ui}, {ST_L2_4, EV_L2_DL_UNITDATA, l2_send_ui}, {ST_L2_5, EV_L2_DL_UNITDATA, l2_send_ui}, {ST_L2_6, EV_L2_DL_UNITDATA, l2_send_ui}, {ST_L2_7, EV_L2_DL_UNITDATA, l2_send_ui}, {ST_L2_8, EV_L2_DL_UNITDATA, 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_timeout}, {ST_L2_6, EV_L2_T200, l2_timeout}, {ST_L2_7, EV_L2_T200, l2_timeout}, {ST_L2_8, EV_L2_T200, l2_timeout}, {ST_L2_7, EV_L2_T203, l2_timeout}, {ST_L2_5, EV_L2_T200I, l2_st5_tout_200}, {ST_L2_6, EV_L2_T200I, l2_st6_tout_200}, {ST_L2_7, EV_L2_T200I, l2_st7_tout_200}, {ST_L2_8, EV_L2_T200I, l2_st8_tout_200}, {ST_L2_7, EV_L2_T203I, 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 int ph_data_indication(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) { u_char *datap = skb->data; int ret = -EINVAL; int psapi, ptei; u_int l; int c = 0; l = l2addrsize(l2); if (skb->len <= l) { mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *) 'N'); return ret; } if (test_bit(FLG_LAPD, &l2->flag)) { /* Maybe not needed */ psapi = *datap++; ptei = *datap++; if ((psapi & 1) || !(ptei & 1)) { printk(KERN_WARNING "%s l2 D-channel frame wrong EA0/EA1\n", mISDNDevName4ch(&l2->ch)); return ret; } psapi >>= 2; ptei >>= 1; if (psapi != l2->sapi) { /* not our business */ if (*debug & DEBUG_L2) printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n", mISDNDevName4ch(&l2->ch), psapi, l2->sapi); dev_kfree_skb(skb); return 0; } if ((ptei != l2->tei) && (ptei != GROUP_TEI)) { /* not our business */ if (*debug & DEBUG_L2) printk(KERN_DEBUG "%s: tei %d/%d mismatch\n", mISDNDevName4ch(&l2->ch), ptei, l2->tei); dev_kfree_skb(skb); return 0; } } else datap += l; if (!(*datap & 1)) { /* I-Frame */ c = iframe_error(l2, skb); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_I, skb); } else if (IsSFrame(datap, l2)) { /* S-Frame */ c = super_error(l2, skb); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SUPER, skb); } else if (IsUI(datap)) { c = UI_error(l2, skb); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UI, skb); } else if (IsSABME(datap, l2)) { c = unnum_error(l2, skb, CMD); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SABME, skb); } else if (IsUA(datap)) { c = unnum_error(l2, skb, RSP); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UA, skb); } else if (IsDISC(datap)) { c = unnum_error(l2, skb, CMD); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DISC, skb); } else if (IsDM(datap)) { c = unnum_error(l2, skb, RSP); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DM, skb); } else if (IsFRMR(datap)) { c = FRMR_error(l2, skb); if (!c) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_FRMR, skb); } else c = 'L'; if (c) { printk(KERN_WARNING "%s:l2 D-channel frame error %c\n", mISDNDevName4ch(&l2->ch), c); mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *)(long)c); } return ret; } static int l2_send(struct mISDNchannel *ch, struct sk_buff *skb) { struct layer2 *l2 = container_of(ch, struct layer2, ch); struct mISDNhead *hh = mISDN_HEAD_P(skb); int ret = -EINVAL; if (*debug & DEBUG_L2_RECV) printk(KERN_DEBUG "%s: %s prim(%x) id(%x) sapi(%d) tei(%d)\n", __func__, mISDNDevName4ch(&l2->ch), hh->prim, hh->id, l2->sapi, l2->tei); if (hh->prim == DL_INTERN_MSG) { struct mISDNhead *chh = hh + 1; /* saved copy */ *hh = *chh; if (*debug & DEBUG_L2_RECV) printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n", mISDNDevName4ch(&l2->ch), hh->prim, hh->id); } switch (hh->prim) { case PH_DATA_IND: ret = ph_data_indication(l2, hh, skb); break; case PH_DATA_CNF: ret = ph_data_confirm(l2, hh, skb); break; case PH_ACTIVATE_IND: test_and_set_bit(FLG_L1_ACTIV, &l2->flag); l2up_create(l2, MPH_ACTIVATE_IND, 0, NULL); if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag)) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_ESTABLISH_REQ, skb); break; case PH_DEACTIVATE_IND: test_and_clear_bit(FLG_L1_ACTIV, &l2->flag); l2up_create(l2, MPH_DEACTIVATE_IND, 0, NULL); ret = mISDN_FsmEvent(&l2->l2m, EV_L1_DEACTIVATE, skb); break; case MPH_INFORMATION_IND: if (!l2->up) break; ret = l2->up->send(l2->up, skb); break; case DL_DATA_REQ: ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_DATA, skb); break; case DL_UNITDATA_REQ: ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_UNITDATA, skb); break; case DL_ESTABLISH_REQ: if (test_bit(FLG_LAPB, &l2->flag)) test_and_set_bit(FLG_ORIG, &l2->flag); if (test_bit(FLG_L1_ACTIV, &l2->flag)) { if (test_bit(FLG_LAPD, &l2->flag) || test_bit(FLG_ORIG, &l2->flag)) ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_ESTABLISH_REQ, skb); } else { if (test_bit(FLG_LAPD, &l2->flag) || test_bit(FLG_ORIG, &l2->flag)) { test_and_set_bit(FLG_ESTAB_PEND, &l2->flag); } ret = l2down(l2, PH_ACTIVATE_REQ, l2_newid(l2), skb); } break; case DL_RELEASE_REQ: if (test_bit(FLG_LAPB, &l2->flag)) l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL); ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ, skb); break; case DL_TIMER200_IND: mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL); break; case DL_TIMER203_IND: mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL); break; default: if (*debug & DEBUG_L2) l2m_debug(&l2->l2m, "l2 unknown pr %04x", hh->prim); } if (ret) { dev_kfree_skb(skb); ret = 0; } return ret; } int tei_l2(struct layer2 *l2, u_int cmd, u_long arg) { int ret = -EINVAL; if (*debug & DEBUG_L2_TEI) printk(KERN_DEBUG "%s: cmd(%x) in %s\n", mISDNDevName4ch(&l2->ch), cmd, __func__); switch (cmd) { case (MDL_ASSIGN_REQ): ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ASSIGN, (void *)arg); break; case (MDL_REMOVE_REQ): ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_REMOVE, NULL); break; case (MDL_ERROR_IND): ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL); break; case (MDL_ERROR_RSP): /* ETS 300-125 5.3.2.1 Test: TC13010 */ printk(KERN_NOTICE "%s: MDL_ERROR|REQ (tei_l2)\n", mISDNDevName4ch(&l2->ch)); ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL); break; } return ret; } static void release_l2(struct layer2 *l2) { mISDN_FsmDelTimer(&l2->t200, 21); mISDN_FsmDelTimer(&l2->t203, 16); skb_queue_purge(&l2->i_queue); skb_queue_purge(&l2->ui_queue); skb_queue_purge(&l2->down_queue); ReleaseWin(l2); if (test_bit(FLG_LAPD, &l2->flag)) { TEIrelease(l2); if (l2->ch.st) l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, CLOSE_CHANNEL, NULL); } kfree(l2); } static int l2_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg) { struct layer2 *l2 = container_of(ch, struct layer2, ch); u_int info; if (*debug & DEBUG_L2_CTRL) printk(KERN_DEBUG "%s: %s cmd(%x)\n", mISDNDevName4ch(ch), __func__, cmd); switch (cmd) { case OPEN_CHANNEL: if (test_bit(FLG_LAPD, &l2->flag)) { set_channel_address(&l2->ch, l2->sapi, l2->tei); info = DL_INFO_L2_CONNECT; l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info); } break; case CLOSE_CHANNEL: if (l2->ch.peer) l2->ch.peer->ctrl(l2->ch.peer, CLOSE_CHANNEL, NULL); release_l2(l2); break; } return 0; } struct layer2 * create_l2(struct mISDNchannel *ch, u_int protocol, u_long options, int tei, int sapi) { struct layer2 *l2; struct channel_req rq; l2 = kzalloc(sizeof(struct layer2), GFP_KERNEL); if (!l2) { printk(KERN_ERR "kzalloc layer2 failed\n"); return NULL; } l2->next_id = 1; l2->down_id = MISDN_ID_NONE; l2->up = ch; l2->ch.st = ch->st; l2->ch.send = l2_send; l2->ch.ctrl = l2_ctrl; switch (protocol) { case ISDN_P_LAPD_NT: test_and_set_bit(FLG_LAPD, &l2->flag); test_and_set_bit(FLG_LAPD_NET, &l2->flag); test_and_set_bit(FLG_MOD128, &l2->flag); l2->sapi = sapi; l2->maxlen = MAX_DFRAME_LEN; if (test_bit(OPTION_L2_PMX, &options)) l2->window = 7; else l2->window = 1; if (test_bit(OPTION_L2_PTP, &options)) test_and_set_bit(FLG_PTP, &l2->flag); if (test_bit(OPTION_L2_FIXEDTEI, &options)) test_and_set_bit(FLG_FIXED_TEI, &l2->flag); l2->tei = tei; l2->T200 = 1000; l2->N200 = 3; l2->T203 = 10000; if (test_bit(OPTION_L2_PMX, &options)) rq.protocol = ISDN_P_NT_E1; else rq.protocol = ISDN_P_NT_S0; rq.adr.channel = 0; l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq); break; case ISDN_P_LAPD_TE: test_and_set_bit(FLG_LAPD, &l2->flag); test_and_set_bit(FLG_MOD128, &l2->flag); test_and_set_bit(FLG_ORIG, &l2->flag); l2->sapi = sapi; l2->maxlen = MAX_DFRAME_LEN; if (test_bit(OPTION_L2_PMX, &options)) l2->window = 7; else l2->window = 1; if (test_bit(OPTION_L2_PTP, &options)) test_and_set_bit(FLG_PTP, &l2->flag); if (test_bit(OPTION_L2_FIXEDTEI, &options)) test_and_set_bit(FLG_FIXED_TEI, &l2->flag); l2->tei = tei; l2->T200 = 1000; l2->N200 = 3; l2->T203 = 10000; if (test_bit(OPTION_L2_PMX, &options)) rq.protocol = ISDN_P_TE_E1; else rq.protocol = ISDN_P_TE_S0; rq.adr.channel = 0; l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq); break; case ISDN_P_B_X75SLP: test_and_set_bit(FLG_LAPB, &l2->flag); l2->window = 7; l2->maxlen = MAX_DATA_SIZE; l2->T200 = 1000; l2->N200 = 4; l2->T203 = 5000; l2->addr.A = 3; l2->addr.B = 1; break; default: printk(KERN_ERR "layer2 create failed prt %x\n", protocol); kfree(l2); return NULL; } skb_queue_head_init(&l2->i_queue); skb_queue_head_init(&l2->ui_queue); skb_queue_head_init(&l2->down_queue); skb_queue_head_init(&l2->tmp_queue); InitWin(l2); l2->l2m.fsm = &l2fsm; if (test_bit(FLG_LAPB, &l2->flag) || test_bit(FLG_FIXED_TEI, &l2->flag) || test_bit(FLG_LAPD_NET, &l2->flag)) l2->l2m.state = ST_L2_4; else l2->l2m.state = ST_L2_1; l2->l2m.debug = *debug; l2->l2m.userdata = l2; l2->l2m.userint = 0; l2->l2m.printdebug = l2m_debug; mISDN_FsmInitTimer(&l2->l2m, &l2->t200); mISDN_FsmInitTimer(&l2->l2m, &l2->t203); return l2; } static int x75create(struct channel_req *crq) { struct layer2 *l2; if (crq->protocol != ISDN_P_B_X75SLP) return -EPROTONOSUPPORT; l2 = create_l2(crq->ch, crq->protocol, 0, 0, 0); if (!l2) return -ENOMEM; crq->ch = &l2->ch; crq->protocol = ISDN_P_B_HDLC; return 0; } static struct Bprotocol X75SLP = { .Bprotocols = (1 << (ISDN_P_B_X75SLP & ISDN_P_B_MASK)), .name = "X75SLP", .create = x75create }; int Isdnl2_Init(u_int *deb) { int res; debug = deb; mISDN_register_Bprotocol(&X75SLP); l2fsm.state_count = L2_STATE_COUNT; l2fsm.event_count = L2_EVENT_COUNT; l2fsm.strEvent = strL2Event; l2fsm.strState = strL2State; res = mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList)); if (res) goto error; res = TEIInit(deb); if (res) goto error_fsm; return 0; error_fsm: mISDN_FsmFree(&l2fsm); error: mISDN_unregister_Bprotocol(&X75SLP); return res; } void Isdnl2_cleanup(void) { mISDN_unregister_Bprotocol(&X75SLP); TEIFree(); mISDN_FsmFree(&l2fsm); }