2217 lines
50 KiB
C
2217 lines
50 KiB
C
/*
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*
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* Author Karsten Keil <kkeil@novell.com>
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*
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* Copyright 2008 by Karsten Keil <kkeil@novell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include "fsm.h"
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#include "layer2.h"
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static int *debug;
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static
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struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL};
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static char *strL2State[] =
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{
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"ST_L2_1",
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"ST_L2_2",
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"ST_L2_3",
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"ST_L2_4",
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"ST_L2_5",
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"ST_L2_6",
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"ST_L2_7",
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"ST_L2_8",
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};
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enum {
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EV_L2_UI,
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EV_L2_SABME,
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EV_L2_DISC,
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EV_L2_DM,
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EV_L2_UA,
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EV_L2_FRMR,
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EV_L2_SUPER,
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EV_L2_I,
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EV_L2_DL_DATA,
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EV_L2_ACK_PULL,
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EV_L2_DL_UNITDATA,
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EV_L2_DL_ESTABLISH_REQ,
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EV_L2_DL_RELEASE_REQ,
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EV_L2_MDL_ASSIGN,
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EV_L2_MDL_REMOVE,
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EV_L2_MDL_ERROR,
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EV_L1_DEACTIVATE,
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EV_L2_T200,
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EV_L2_T203,
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EV_L2_SET_OWN_BUSY,
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EV_L2_CLEAR_OWN_BUSY,
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EV_L2_FRAME_ERROR,
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};
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#define L2_EVENT_COUNT (EV_L2_FRAME_ERROR+1)
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static char *strL2Event[] =
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{
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"EV_L2_UI",
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"EV_L2_SABME",
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"EV_L2_DISC",
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"EV_L2_DM",
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"EV_L2_UA",
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"EV_L2_FRMR",
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"EV_L2_SUPER",
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"EV_L2_I",
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"EV_L2_DL_DATA",
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"EV_L2_ACK_PULL",
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"EV_L2_DL_UNITDATA",
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"EV_L2_DL_ESTABLISH_REQ",
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"EV_L2_DL_RELEASE_REQ",
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"EV_L2_MDL_ASSIGN",
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"EV_L2_MDL_REMOVE",
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"EV_L2_MDL_ERROR",
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"EV_L1_DEACTIVATE",
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"EV_L2_T200",
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"EV_L2_T203",
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"EV_L2_SET_OWN_BUSY",
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"EV_L2_CLEAR_OWN_BUSY",
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"EV_L2_FRAME_ERROR",
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};
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static void
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l2m_debug(struct FsmInst *fi, char *fmt, ...)
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{
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struct layer2 *l2 = fi->userdata;
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va_list va;
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if (!(*debug & DEBUG_L2_FSM))
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return;
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va_start(va, fmt);
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printk(KERN_DEBUG "l2 (tei %d): ", l2->tei);
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vprintk(fmt, va);
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printk("\n");
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va_end(va);
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}
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inline u_int
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l2headersize(struct layer2 *l2, int ui)
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{
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return ((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
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(test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
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}
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inline u_int
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l2addrsize(struct layer2 *l2)
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{
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return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1;
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}
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static u_int
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l2_newid(struct layer2 *l2)
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{
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u_int id;
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id = l2->next_id++;
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if (id == 0x7fff)
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l2->next_id = 1;
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id <<= 16;
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id |= l2->tei << 8;
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id |= l2->sapi;
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return id;
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}
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static void
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l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb)
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{
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int err;
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if (!l2->up)
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return;
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mISDN_HEAD_PRIM(skb) = prim;
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mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr;
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err = l2->up->send(l2->up, skb);
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if (err) {
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printk(KERN_WARNING "%s: err=%d\n", __func__, err);
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dev_kfree_skb(skb);
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}
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}
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static void
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l2up_create(struct layer2 *l2, u_int prim, int len, void *arg)
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{
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struct sk_buff *skb;
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struct mISDNhead *hh;
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int err;
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if (!l2->up)
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return;
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skb = mI_alloc_skb(len, GFP_ATOMIC);
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if (!skb)
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return;
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hh = mISDN_HEAD_P(skb);
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hh->prim = prim;
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hh->id = (l2->ch.nr << 16) | l2->ch.addr;
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if (len)
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memcpy(skb_put(skb, len), arg, len);
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err = l2->up->send(l2->up, skb);
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if (err) {
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printk(KERN_WARNING "%s: err=%d\n", __func__, err);
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dev_kfree_skb(skb);
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}
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}
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static int
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l2down_skb(struct layer2 *l2, struct sk_buff *skb) {
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int ret;
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ret = l2->ch.recv(l2->ch.peer, skb);
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if (ret && (*debug & DEBUG_L2_RECV))
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printk(KERN_DEBUG "l2down_skb: ret(%d)\n", ret);
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return ret;
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}
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static int
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l2down_raw(struct layer2 *l2, struct sk_buff *skb)
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{
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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if (hh->prim == PH_DATA_REQ) {
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if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
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skb_queue_tail(&l2->down_queue, skb);
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return 0;
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}
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l2->down_id = mISDN_HEAD_ID(skb);
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}
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return l2down_skb(l2, skb);
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}
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static int
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l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb)
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{
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struct mISDNhead *hh = mISDN_HEAD_P(skb);
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hh->prim = prim;
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hh->id = id;
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return l2down_raw(l2, skb);
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}
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static int
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l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg)
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{
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struct sk_buff *skb;
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int err;
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struct mISDNhead *hh;
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skb = mI_alloc_skb(len, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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hh = mISDN_HEAD_P(skb);
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hh->prim = prim;
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hh->id = id;
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if (len)
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memcpy(skb_put(skb, len), arg, len);
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err = l2down_raw(l2, skb);
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if (err)
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dev_kfree_skb(skb);
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return err;
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}
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static int
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ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) {
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struct sk_buff *nskb = skb;
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int ret = -EAGAIN;
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if (test_bit(FLG_L1_NOTREADY, &l2->flag)) {
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if (hh->id == l2->down_id) {
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nskb = skb_dequeue(&l2->down_queue);
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if (nskb) {
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l2->down_id = mISDN_HEAD_ID(nskb);
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if (l2down_skb(l2, nskb)) {
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dev_kfree_skb(nskb);
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l2->down_id = MISDN_ID_NONE;
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}
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} else
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l2->down_id = MISDN_ID_NONE;
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if (ret) {
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dev_kfree_skb(skb);
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ret = 0;
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}
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if (l2->down_id == MISDN_ID_NONE) {
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test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
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mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
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}
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}
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}
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if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
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nskb = skb_dequeue(&l2->down_queue);
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if (nskb) {
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l2->down_id = mISDN_HEAD_ID(nskb);
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if (l2down_skb(l2, nskb)) {
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dev_kfree_skb(nskb);
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l2->down_id = MISDN_ID_NONE;
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test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
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}
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} else
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test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
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}
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return ret;
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}
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static int
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l2mgr(struct layer2 *l2, u_int prim, void *arg) {
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long c = (long)arg;
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printk(KERN_WARNING
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"l2mgr: addr:%x prim %x %c\n", l2->id, prim, (char)c);
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if (test_bit(FLG_LAPD, &l2->flag) &&
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!test_bit(FLG_FIXED_TEI, &l2->flag)) {
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switch (c) {
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case 'C':
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case 'D':
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case 'G':
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case 'H':
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l2_tei(l2, prim, (u_long)arg);
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break;
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}
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}
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return 0;
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}
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static void
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set_peer_busy(struct layer2 *l2) {
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test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
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if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
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test_and_set_bit(FLG_L2BLOCK, &l2->flag);
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}
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static void
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clear_peer_busy(struct layer2 *l2) {
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if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
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test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
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}
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static void
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InitWin(struct layer2 *l2)
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{
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int i;
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for (i = 0; i < MAX_WINDOW; i++)
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l2->windowar[i] = NULL;
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}
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static int
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freewin(struct layer2 *l2)
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{
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int i, cnt = 0;
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for (i = 0; i < MAX_WINDOW; i++) {
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if (l2->windowar[i]) {
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cnt++;
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dev_kfree_skb(l2->windowar[i]);
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l2->windowar[i] = NULL;
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}
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}
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return cnt;
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}
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static void
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ReleaseWin(struct layer2 *l2)
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{
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int cnt = freewin(l2);
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if (cnt)
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printk(KERN_WARNING
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"isdnl2 freed %d skbuffs in release\n", cnt);
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}
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inline unsigned int
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cansend(struct layer2 *l2)
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{
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unsigned int p1;
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if (test_bit(FLG_MOD128, &l2->flag))
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p1 = (l2->vs - l2->va) % 128;
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else
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p1 = (l2->vs - l2->va) % 8;
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return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &l2->flag);
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}
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inline void
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clear_exception(struct layer2 *l2)
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{
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test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
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test_and_clear_bit(FLG_REJEXC, &l2->flag);
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test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
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clear_peer_busy(l2);
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}
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static int
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sethdraddr(struct layer2 *l2, u_char *header, int rsp)
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{
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u_char *ptr = header;
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int crbit = rsp;
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if (test_bit(FLG_LAPD, &l2->flag)) {
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if (test_bit(FLG_LAPD_NET, &l2->flag))
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crbit = !crbit;
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*ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0);
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*ptr++ = (l2->tei << 1) | 1;
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return 2;
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} else {
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if (test_bit(FLG_ORIG, &l2->flag))
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crbit = !crbit;
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if (crbit)
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*ptr++ = l2->addr.B;
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else
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*ptr++ = l2->addr.A;
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return 1;
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}
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}
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static inline void
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enqueue_super(struct layer2 *l2, struct sk_buff *skb)
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{
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if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
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dev_kfree_skb(skb);
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}
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static inline void
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enqueue_ui(struct layer2 *l2, struct sk_buff *skb)
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{
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if (l2->tm)
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l2_tei(l2, MDL_STATUS_UI_IND, 0);
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if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
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dev_kfree_skb(skb);
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}
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inline int
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IsUI(u_char *data)
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{
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return (data[0] & 0xef) == UI;
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}
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inline int
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IsUA(u_char *data)
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{
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return (data[0] & 0xef) == UA;
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}
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inline int
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IsDM(u_char *data)
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{
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return (data[0] & 0xef) == DM;
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}
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inline int
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IsDISC(u_char *data)
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{
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return (data[0] & 0xef) == DISC;
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}
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inline int
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IsRR(u_char *data, struct layer2 *l2)
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{
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if (test_bit(FLG_MOD128, &l2->flag))
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return data[0] == RR;
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else
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return (data[0] & 0xf) == 1;
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}
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inline int
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IsSFrame(u_char *data, struct layer2 *l2)
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{
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register u_char d = *data;
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if (!test_bit(FLG_MOD128, &l2->flag))
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d &= 0xf;
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return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c);
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}
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inline int
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IsSABME(u_char *data, struct layer2 *l2)
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{
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u_char d = data[0] & ~0x10;
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return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM;
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}
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inline int
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IsREJ(u_char *data, struct layer2 *l2)
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{
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return test_bit(FLG_MOD128, &l2->flag) ?
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data[0] == REJ : (data[0] & 0xf) == REJ;
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}
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inline int
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IsFRMR(u_char *data)
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{
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return (data[0] & 0xef) == FRMR;
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}
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inline int
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IsRNR(u_char *data, struct layer2 *l2)
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{
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return test_bit(FLG_MOD128, &l2->flag) ?
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data[0] == RNR : (data[0] & 0xf) == RNR;
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}
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int
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iframe_error(struct layer2 *l2, struct sk_buff *skb)
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{
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u_int i;
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int rsp = *skb->data & 0x2;
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i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1);
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if (test_bit(FLG_ORIG, &l2->flag))
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rsp = !rsp;
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if (rsp)
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return 'L';
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if (skb->len < i)
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return 'N';
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if ((skb->len - i) > l2->maxlen)
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return 'O';
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return 0;
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}
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int
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super_error(struct layer2 *l2, struct sk_buff *skb)
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{
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if (skb->len != l2addrsize(l2) +
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(test_bit(FLG_MOD128, &l2->flag) ? 2 : 1))
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return 'N';
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return 0;
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}
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int
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unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp)
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{
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int rsp = (*skb->data & 0x2) >> 1;
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if (test_bit(FLG_ORIG, &l2->flag))
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rsp = !rsp;
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if (rsp != wantrsp)
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return 'L';
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if (skb->len != l2addrsize(l2) + 1)
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return 'N';
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return 0;
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}
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int
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UI_error(struct layer2 *l2, struct sk_buff *skb)
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{
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int rsp = *skb->data & 0x2;
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if (test_bit(FLG_ORIG, &l2->flag))
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rsp = !rsp;
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if (rsp)
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return 'L';
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if (skb->len > l2->maxlen + l2addrsize(l2) + 1)
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return 'O';
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return 0;
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}
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int
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|
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\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
}
|
|
memcpy(skb_put(skb, i), 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);
|
|
if (skb)
|
|
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);
|
|
}
|
|
}
|
|
|
|
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
|
|
"isdnl2 can't alloc sbbuff for enquiry_cr\n");
|
|
return;
|
|
}
|
|
memcpy(skb_put(skb, i), 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",
|
|
__func__, 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, *oskb;
|
|
u_char header[MAX_L2HEADER_LEN];
|
|
u_int i, p1;
|
|
|
|
if (!cansend(l2))
|
|
return;
|
|
|
|
skb = skb_dequeue(&l2->i_queue);
|
|
if (!skb)
|
|
return;
|
|
|
|
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;
|
|
i = sethdraddr(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;
|
|
}
|
|
|
|
nskb = skb_clone(skb, GFP_ATOMIC);
|
|
p1 = skb_headroom(nskb);
|
|
if (p1 >= i)
|
|
memcpy(skb_push(nskb, i), header, i);
|
|
else {
|
|
printk(KERN_WARNING
|
|
"isdnl2 pull_iqueue skb header(%d/%d) too short\n", i, p1);
|
|
oskb = nskb;
|
|
nskb = mI_alloc_skb(oskb->len + i, GFP_ATOMIC);
|
|
if (!nskb) {
|
|
dev_kfree_skb(oskb);
|
|
printk(KERN_WARNING "%s: no skb mem\n", __func__);
|
|
return;
|
|
}
|
|
memcpy(skb_put(nskb, i), header, i);
|
|
memcpy(skb_put(nskb, oskb->len), oskb->data, oskb->len);
|
|
dev_kfree_skb(oskb);
|
|
}
|
|
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_persistant_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_persistant_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_persistant_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_persistant_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);
|
|
}
|
|
if (skb)
|
|
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);
|
|
}
|
|
if (skb)
|
|
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_st5_tout_200},
|
|
{ST_L2_6, EV_L2_T200, l2_st6_tout_200},
|
|
{ST_L2_7, EV_L2_T200, l2_st7_tout_200},
|
|
{ST_L2_8, EV_L2_T200, l2_st8_tout_200},
|
|
{ST_L2_7, EV_L2_T203, l2_st7_tout_203},
|
|
{ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
|
|
{ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
|
|
{ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
|
|
{ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
|
|
{ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
|
|
{ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
|
|
{ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
|
|
{ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
|
|
{ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
|
|
{ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
|
|
{ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistant_da},
|
|
{ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
|
|
{ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
|
|
{ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistant_da},
|
|
{ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistant_da},
|
|
{ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistant_da},
|
|
{ST_L2_7, EV_L1_DEACTIVATE, l2_persistant_da},
|
|
{ST_L2_8, EV_L1_DEACTIVATE, l2_persistant_da},
|
|
};
|
|
|
|
#define L2_FN_COUNT (sizeof(L2FnList)/sizeof(struct FsmNode))
|
|
|
|
static 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
|
|
"l2 D-channel frame wrong EA0/EA1\n");
|
|
return ret;
|
|
}
|
|
psapi >>= 2;
|
|
ptei >>= 1;
|
|
if (psapi != l2->sapi) {
|
|
/* not our bussiness
|
|
* printk(KERN_DEBUG "%s: sapi %d/%d sapi mismatch\n",
|
|
* __func__,
|
|
* psapi, l2->sapi);
|
|
*/
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
if ((ptei != l2->tei) && (ptei != GROUP_TEI)) {
|
|
/* not our bussiness
|
|
* printk(KERN_DEBUG "%s: tei %d/%d sapi %d mismatch\n",
|
|
* __func__,
|
|
* ptei, l2->tei, psapi);
|
|
*/
|
|
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 "l2 D-channel frame error %c\n", 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: prim(%x) id(%x) tei(%d)\n",
|
|
__func__, hh->prim, hh->id, l2->tei);
|
|
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;
|
|
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)\n", __func__, cmd);
|
|
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 "MDL_ERROR|REQ (tei_l2)\n");
|
|
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:(%x)\n", __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, u_long arg)
|
|
{
|
|
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 = 0;
|
|
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 = (u_int)arg;
|
|
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 = 0;
|
|
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 = (u_int)arg;
|
|
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_PTP, &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);
|
|
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)
|
|
{
|
|
debug = deb;
|
|
mISDN_register_Bprotocol(&X75SLP);
|
|
l2fsm.state_count = L2_STATE_COUNT;
|
|
l2fsm.event_count = L2_EVENT_COUNT;
|
|
l2fsm.strEvent = strL2Event;
|
|
l2fsm.strState = strL2State;
|
|
mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
|
|
TEIInit(deb);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
Isdnl2_cleanup(void)
|
|
{
|
|
mISDN_unregister_Bprotocol(&X75SLP);
|
|
TEIFree();
|
|
mISDN_FsmFree(&l2fsm);
|
|
}
|
|
|