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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>
static void rose_ftimer_expiry(struct timer_list *);
static void rose_t0timer_expiry(struct timer_list *);
static void rose_transmit_restart_confirmation(struct rose_neigh *neigh);
static void rose_transmit_restart_request(struct rose_neigh *neigh);
void rose_start_ftimer(struct rose_neigh *neigh)
{
del_timer(&neigh->ftimer);
neigh->ftimer.function = rose_ftimer_expiry;
neigh->ftimer.expires =
jiffies + msecs_to_jiffies(sysctl_rose_link_fail_timeout);
add_timer(&neigh->ftimer);
}
static void rose_start_t0timer(struct rose_neigh *neigh)
{
del_timer(&neigh->t0timer);
neigh->t0timer.function = rose_t0timer_expiry;
neigh->t0timer.expires =
jiffies + msecs_to_jiffies(sysctl_rose_restart_request_timeout);
add_timer(&neigh->t0timer);
}
void rose_stop_ftimer(struct rose_neigh *neigh)
{
del_timer(&neigh->ftimer);
}
void rose_stop_t0timer(struct rose_neigh *neigh)
{
del_timer(&neigh->t0timer);
}
int rose_ftimer_running(struct rose_neigh *neigh)
{
return timer_pending(&neigh->ftimer);
}
static int rose_t0timer_running(struct rose_neigh *neigh)
{
return timer_pending(&neigh->t0timer);
}
static void rose_ftimer_expiry(struct timer_list *t)
{
}
static void rose_t0timer_expiry(struct timer_list *t)
{
struct rose_neigh *neigh = from_timer(neigh, t, t0timer);
rose_transmit_restart_request(neigh);
neigh->dce_mode = 0;
rose_start_t0timer(neigh);
}
/*
* Interface to ax25_send_frame. Changes my level 2 callsign depending
* on whether we have a global ROSE callsign or use the default port
* callsign.
*/
static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
{
ax25_address *rose_call;
ax25_cb *ax25s;
if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
rose_call = (ax25_address *)neigh->dev->dev_addr;
else
rose_call = &rose_callsign;
ax25s = neigh->ax25;
neigh->ax25 = ax25_send_frame(skb, 260, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
if (ax25s)
ax25_cb_put(ax25s);
return neigh->ax25 != NULL;
}
/*
* Interface to ax25_link_up. Changes my level 2 callsign depending
* on whether we have a global ROSE callsign or use the default port
* callsign.
*/
static int rose_link_up(struct rose_neigh *neigh)
{
ax25_address *rose_call;
ax25_cb *ax25s;
if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
rose_call = (ax25_address *)neigh->dev->dev_addr;
else
rose_call = &rose_callsign;
ax25s = neigh->ax25;
neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
if (ax25s)
ax25_cb_put(ax25s);
return neigh->ax25 != NULL;
}
/*
* This handles all restart and diagnostic frames.
*/
void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
{
struct sk_buff *skbn;
switch (frametype) {
case ROSE_RESTART_REQUEST:
rose_stop_t0timer(neigh);
neigh->restarted = 1;
neigh->dce_mode = (skb->data[3] == ROSE_DTE_ORIGINATED);
rose_transmit_restart_confirmation(neigh);
break;
case ROSE_RESTART_CONFIRMATION:
rose_stop_t0timer(neigh);
neigh->restarted = 1;
break;
case ROSE_DIAGNOSTIC:
pr_warn("ROSE: received diagnostic #%d - %3ph\n", skb->data[3],
skb->data + 4);
break;
default:
printk(KERN_WARNING "ROSE: received unknown %02X with LCI 000\n", frametype);
break;
}
if (neigh->restarted) {
while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
if (!rose_send_frame(skbn, neigh))
kfree_skb(skbn);
}
}
/*
* This routine is called when a Restart Request is needed
*/
static void rose_transmit_restart_request(struct rose_neigh *neigh)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 3);
*dptr++ = AX25_P_ROSE;
*dptr++ = ROSE_GFI;
*dptr++ = 0x00;
*dptr++ = ROSE_RESTART_REQUEST;
*dptr++ = ROSE_DTE_ORIGINATED;
*dptr++ = 0;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
/*
* This routine is called when a Restart Confirmation is needed
*/
static void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 1);
*dptr++ = AX25_P_ROSE;
*dptr++ = ROSE_GFI;
*dptr++ = 0x00;
*dptr++ = ROSE_RESTART_CONFIRMATION;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
/*
* This routine is called when a Clear Request is needed outside of the context
* of a connected socket.
*/
void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
{
struct sk_buff *skb;
unsigned char *dptr;
int len;
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
return;
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
dptr = skb_put(skb, ROSE_MIN_LEN + 3);
*dptr++ = AX25_P_ROSE;
*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
*dptr++ = ((lci >> 0) & 0xFF);
*dptr++ = ROSE_CLEAR_REQUEST;
*dptr++ = cause;
*dptr++ = diagnostic;
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
}
void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
{
unsigned char *dptr;
if (neigh->loopback) {
rose_loopback_queue(skb, neigh);
return;
}
if (!rose_link_up(neigh))
neigh->restarted = 0;
dptr = skb_push(skb, 1);
*dptr++ = AX25_P_ROSE;
if (neigh->restarted) {
if (!rose_send_frame(skb, neigh))
kfree_skb(skb);
} else {
skb_queue_tail(&neigh->queue, skb);
if (!rose_t0timer_running(neigh)) {
rose_transmit_restart_request(neigh);
neigh->dce_mode = 0;
rose_start_t0timer(neigh);
}
}
}
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