300 строки
6.9 KiB
C
300 строки
6.9 KiB
C
/*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/netfilter.h>
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#include <net/rose.h>
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static void rose_ftimer_expiry(unsigned long);
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static void rose_t0timer_expiry(unsigned long);
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static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
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static void rose_transmit_restart_request(struct rose_neigh *neigh);
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void rose_start_ftimer(struct rose_neigh *neigh)
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{
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del_timer(&neigh->ftimer);
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neigh->ftimer.data = (unsigned long)neigh;
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neigh->ftimer.function = &rose_ftimer_expiry;
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neigh->ftimer.expires =
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jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
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add_timer(&neigh->ftimer);
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}
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static void rose_start_t0timer(struct rose_neigh *neigh)
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{
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del_timer(&neigh->t0timer);
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neigh->t0timer.data = (unsigned long)neigh;
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neigh->t0timer.function = &rose_t0timer_expiry;
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neigh->t0timer.expires =
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jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
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add_timer(&neigh->t0timer);
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}
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void rose_stop_ftimer(struct rose_neigh *neigh)
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{
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del_timer(&neigh->ftimer);
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}
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void rose_stop_t0timer(struct rose_neigh *neigh)
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{
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del_timer(&neigh->t0timer);
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}
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int rose_ftimer_running(struct rose_neigh *neigh)
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{
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return timer_pending(&neigh->ftimer);
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}
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static int rose_t0timer_running(struct rose_neigh *neigh)
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{
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return timer_pending(&neigh->t0timer);
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}
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static void rose_ftimer_expiry(unsigned long param)
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{
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}
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static void rose_t0timer_expiry(unsigned long param)
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{
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struct rose_neigh *neigh = (struct rose_neigh *)param;
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rose_transmit_restart_request(neigh);
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neigh->dce_mode = 0;
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rose_start_t0timer(neigh);
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}
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/*
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* Interface to ax25_send_frame. Changes my level 2 callsign depending
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* on whether we have a global ROSE callsign or use the default port
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* callsign.
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*/
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static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
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{
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ax25_address *rose_call;
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ax25_cb *ax25s;
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if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
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rose_call = (ax25_address *)neigh->dev->dev_addr;
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else
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rose_call = &rose_callsign;
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ax25s = neigh->ax25;
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neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
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if (ax25s)
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ax25_cb_put(ax25s);
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return (neigh->ax25 != NULL);
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}
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/*
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* Interface to ax25_link_up. Changes my level 2 callsign depending
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* on whether we have a global ROSE callsign or use the default port
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* callsign.
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*/
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static int rose_link_up(struct rose_neigh *neigh)
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{
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ax25_address *rose_call;
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ax25_cb *ax25s;
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if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
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rose_call = (ax25_address *)neigh->dev->dev_addr;
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else
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rose_call = &rose_callsign;
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ax25s = neigh->ax25;
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neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
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if (ax25s)
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ax25_cb_put(ax25s);
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return (neigh->ax25 != NULL);
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}
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/*
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* This handles all restart and diagnostic frames.
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*/
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void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
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{
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struct sk_buff *skbn;
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switch (frametype) {
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case ROSE_RESTART_REQUEST:
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rose_stop_t0timer(neigh);
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neigh->restarted = 1;
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neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
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rose_transmit_restart_confirmation(neigh);
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break;
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case ROSE_RESTART_CONFIRMATION:
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rose_stop_t0timer(neigh);
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neigh->restarted = 1;
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break;
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case ROSE_DIAGNOSTIC:
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printk(KERN_WARNING "ROSE: received diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
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break;
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default:
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printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
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break;
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}
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if (neigh->restarted) {
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while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
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if (!rose_send_frame(skbn, neigh))
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kfree_skb(skbn);
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}
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}
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/*
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* This routine is called when a Restart Request is needed
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*/
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static void rose_transmit_restart_request(struct rose_neigh *neigh)
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{
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struct sk_buff *skb;
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unsigned char *dptr;
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int len;
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
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dptr = skb_put(skb, ROSE_MIN_LEN + 3);
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*dptr++ = AX25_P_ROSE;
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*dptr++ = ROSE_GFI;
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*dptr++ = 0x00;
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*dptr++ = ROSE_RESTART_REQUEST;
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*dptr++ = ROSE_DTE_ORIGINATED;
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*dptr++ = 0;
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if (!rose_send_frame(skb, neigh))
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kfree_skb(skb);
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}
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/*
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* This routine is called when a Restart Confirmation is needed
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*/
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static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
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{
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struct sk_buff *skb;
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unsigned char *dptr;
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int len;
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
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dptr = skb_put(skb, ROSE_MIN_LEN + 1);
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*dptr++ = AX25_P_ROSE;
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*dptr++ = ROSE_GFI;
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*dptr++ = 0x00;
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*dptr++ = ROSE_RESTART_CONFIRMATION;
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if (!rose_send_frame(skb, neigh))
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kfree_skb(skb);
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}
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/*
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* This routine is called when a Clear Request is needed outside of the context
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* of a connected socket.
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*/
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void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
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{
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struct sk_buff *skb;
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unsigned char *dptr;
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int len;
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
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if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
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return;
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skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
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dptr = skb_put(skb, ROSE_MIN_LEN + 3);
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*dptr++ = AX25_P_ROSE;
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*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
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*dptr++ = ((lci >> 0) & 0xFF);
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*dptr++ = ROSE_CLEAR_REQUEST;
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*dptr++ = cause;
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*dptr++ = diagnostic;
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if (!rose_send_frame(skb, neigh))
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kfree_skb(skb);
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}
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void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
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{
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unsigned char *dptr;
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#if 0
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if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT) {
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kfree_skb(skb);
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return;
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}
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#endif
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if (neigh->loopback) {
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rose_loopback_queue(skb, neigh);
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return;
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}
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if (!rose_link_up(neigh))
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neigh->restarted = 0;
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dptr = skb_push(skb, 1);
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*dptr++ = AX25_P_ROSE;
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if (neigh->restarted) {
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if (!rose_send_frame(skb, neigh))
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kfree_skb(skb);
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} else {
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skb_queue_tail(&neigh->queue, skb);
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if (!rose_t0timer_running(neigh)) {
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rose_transmit_restart_request(neigh);
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neigh->dce_mode = 0;
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rose_start_t0timer(neigh);
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}
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}
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}
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