5b277b8605
Added SAPI value to use SAPIs different than 0. Now fixed TEIs work in NT mode. This allows PTP endpoint to be connected to PTMP ports together with other PTMP endpoints. New enhanced version, thanks to Sam Ravnborg <sam@ravnborg.org> for the hints. Signed-off-by: Andreas Eversberg <andreas@eversberg.eu> Signed-off-by: Karsten Keil <keil@b1-systems.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2220 lines
50 KiB
C
2220 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 <linux/mISDNif.h>
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#include "core.h"
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#include "fsm.h"
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#include "layer2.h"
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static u_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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static 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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static 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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static 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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static int
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UI_error(struct layer2 *l2, struct sk_buff *skb)
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{
|
|
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\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);
|
|
}
|
|
}
|
|
|
|
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
|
|
"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, 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_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, 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);
|
|
}
|
|
|