/*
 *      ROSE release 003
 *
 *      This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *      This module:
 *              This module is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      History
 *      ROSE 001        Jonathan(G4KLX) Cloned from nr_route.c.
 *                      Terry(VK2KTJ)   Added support for variable length
 *                                      address masks.
 *      ROSE 002        Jonathan(G4KLX) Uprated through routing of packets.
 *                                      Routing loop detection.
 *      ROSE 003        Jonathan(G4KLX) New timer architecture.
 *                                      Added use count to neighbours.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <net/arp.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/segment.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/termios.h>      /* For TIOCINQ/OUTQ */
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/netfilter.h>
#include <linux/init.h>
#include <net/rose.h>

static unsigned int rose_neigh_no = 1;

static struct rose_node  *rose_node_list;
static struct rose_neigh *rose_neigh_list;
static struct rose_route *rose_route_list;

struct rose_neigh *rose_loopback_neigh;

static void rose_remove_neigh(struct rose_neigh *);

/*
 *      Add a new route to a node, and in the process add the node and the
 *      neighbour if it is new.
 */
static int rose_add_node(struct rose_route_struct *rose_route, struct net_device *dev)
{
        struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;
        struct rose_neigh *rose_neigh;
        unsigned long flags;
        int i;

        for (rose_node = rose_node_list; rose_node != NULL; rose_node = rose_node->next)
                if ((rose_node->mask == rose_route->mask) && (rosecmpm(&rose_route->address, &rose_node->address, rose_route->mask) == 0))
                        break;

        if (rose_node != NULL && rose_node->loopback)
                return -EINVAL;

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next)
                if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0 && rose_neigh->dev == dev)
                        break;

        if (rose_neigh == NULL) {
                if ((rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC)) == NULL)
                        return -ENOMEM;

                rose_neigh->callsign  = rose_route->neighbour;
                rose_neigh->digipeat  = NULL;
                rose_neigh->ax25      = NULL;
                rose_neigh->dev       = dev;
                rose_neigh->count     = 0;
                rose_neigh->use       = 0;
                rose_neigh->dce_mode  = 0;
                rose_neigh->loopback  = 0;
                rose_neigh->number    = rose_neigh_no++;
                rose_neigh->restarted = 0;

                skb_queue_head_init(&rose_neigh->queue);

                init_timer(&rose_neigh->ftimer);
                init_timer(&rose_neigh->t0timer);

                if (rose_route->ndigis != 0) {
                        if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
                                kfree(rose_neigh);
                                return -ENOMEM;
                        }

                        rose_neigh->digipeat->ndigi      = rose_route->ndigis;
                        rose_neigh->digipeat->lastrepeat = -1;

                        for (i = 0; i < rose_route->ndigis; i++) {
                                rose_neigh->digipeat->calls[i]    = rose_route->digipeaters[i];
                                rose_neigh->digipeat->repeated[i] = 0;
                        }
                }

                save_flags(flags); cli();
                rose_neigh->next = rose_neigh_list;
                rose_neigh_list  = rose_neigh;
                restore_flags(flags);
        }

        /*
         * This is a new node to be inserted into the list. Find where it needs
         * to be inserted into the list, and insert it. We want to be sure
         * to order the list in descending order of mask size to ensure that
         * later when we are searching this list the first match will be the
         * best match.
         */
        if (rose_node == NULL) {
                rose_tmpn = rose_node_list;
                rose_tmpp = NULL;

                while (rose_tmpn != NULL) {
                        if (rose_tmpn->mask > rose_route->mask) {
                                rose_tmpp = rose_tmpn;
                                rose_tmpn = rose_tmpn->next;
                        } else {
                                break;
                        }
                }

                /* create new node */
                if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL)
                        return -ENOMEM;

                rose_node->address      = rose_route->address;
                rose_node->mask         = rose_route->mask;
                rose_node->count        = 1;
                rose_node->loopback     = 0;
                rose_node->neighbour[0] = rose_neigh;

                save_flags(flags); cli();

                if (rose_tmpn == NULL) {
                        if (rose_tmpp == NULL) {        /* Empty list */
                                rose_node_list  = rose_node;
                                rose_node->next = NULL;
                        } else {
                                rose_tmpp->next = rose_node;
                                rose_node->next = NULL;
                        }
                } else {
                        if (rose_tmpp == NULL) {        /* 1st node */
                                rose_node->next = rose_node_list;
                                rose_node_list  = rose_node;
                        } else {
                                rose_tmpp->next = rose_node;
                                rose_node->next = rose_tmpn;
                        }
                }

                restore_flags(flags);

                rose_neigh->count++;

                return 0;
        }

        /* We have space, slot it in */
        if (rose_node->count < 3) {
                rose_node->neighbour[rose_node->count] = rose_neigh;
                rose_node->count++;
                rose_neigh->count++;
        }

        return 0;
}

static void rose_remove_node(struct rose_node *rose_node)
{
        struct rose_node *s;
        unsigned long flags;
        
        save_flags(flags);
        cli();

        if ((s = rose_node_list) == rose_node) {
                rose_node_list = rose_node->next;
                restore_flags(flags);
                kfree(rose_node);
                return;
        }

        while (s != NULL && s->next != NULL) {
                if (s->next == rose_node) {
                        s->next = rose_node->next;
                        restore_flags(flags);
                        kfree(rose_node);
                        return;
                }

                s = s->next;
        }

        restore_flags(flags);
}

static void rose_remove_neigh(struct rose_neigh *rose_neigh)
{
        struct rose_neigh *s;
        unsigned long flags;

        rose_stop_ftimer(rose_neigh);
        rose_stop_t0timer(rose_neigh);

        skb_queue_purge(&rose_neigh->queue);

        save_flags(flags); cli();

        if ((s = rose_neigh_list) == rose_neigh) {
                rose_neigh_list = rose_neigh->next;
                restore_flags(flags);
                if (rose_neigh->digipeat != NULL)
                        kfree(rose_neigh->digipeat);
                kfree(rose_neigh);
                return;
        }

        while (s != NULL && s->next != NULL) {
                if (s->next == rose_neigh) {
                        s->next = rose_neigh->next;
                        restore_flags(flags);
                        if (rose_neigh->digipeat != NULL)
                                kfree(rose_neigh->digipeat);
                        kfree(rose_neigh);
                        return;
                }

                s = s->next;
        }

        restore_flags(flags);
}

static void rose_remove_route(struct rose_route *rose_route)
{
        struct rose_route *s;
        unsigned long flags;

        if (rose_route->neigh1 != NULL)
                rose_route->neigh1->use--;

        if (rose_route->neigh2 != NULL)
                rose_route->neigh2->use--;

        save_flags(flags); cli();

        if ((s = rose_route_list) == rose_route) {
                rose_route_list = rose_route->next;
                restore_flags(flags);
                kfree(rose_route);
                return;
        }

        while (s != NULL && s->next != NULL) {
                if (s->next == rose_route) {
                        s->next = rose_route->next;
                        restore_flags(flags);
                        kfree(rose_route);
                        return;
                }

                s = s->next;
        }

        restore_flags(flags);
}

/*
 *      "Delete" a node. Strictly speaking remove a route to a node. The node
 *      is only deleted if no routes are left to it.
 */
static int rose_del_node(struct rose_route_struct *rose_route, struct net_device *dev)
{
        struct rose_node  *rose_node;
        struct rose_neigh *rose_neigh;
        int i;

        for (rose_node = rose_node_list; rose_node != NULL; rose_node = rose_node->next)
                if ((rose_node->mask == rose_route->mask) && (rosecmpm(&rose_route->address, &rose_node->address, rose_route->mask) == 0))
                        break;

        if (rose_node == NULL) return -EINVAL;

        if (rose_node->loopback) return -EINVAL;

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next)
                if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0 && rose_neigh->dev == dev)
                        break;

        if (rose_neigh == NULL) return -EINVAL;

        for (i = 0; i < rose_node->count; i++) {
                if (rose_node->neighbour[i] == rose_neigh) {
                        rose_neigh->count--;

                        if (rose_neigh->count == 0 && rose_neigh->use == 0)
                                rose_remove_neigh(rose_neigh);

                        rose_node->count--;

                        if (rose_node->count == 0) {
                                rose_remove_node(rose_node);
                        } else {
                                switch (i) {
                                        case 0:
                                                rose_node->neighbour[0] = rose_node->neighbour[1];
                                        case 1:
                                                rose_node->neighbour[1] = rose_node->neighbour[2];
                                        case 2:
                                                break;
                                }
                        }

                        return 0;
                }
        }

        return -EINVAL;
}

/*
 *      Add the loopback neighbour.
 */
int rose_add_loopback_neigh(void)
{
        unsigned long flags;

        if ((rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_ATOMIC)) == NULL)
                return -ENOMEM;

        rose_loopback_neigh->callsign  = null_ax25_address;
        rose_loopback_neigh->digipeat  = NULL;
        rose_loopback_neigh->ax25      = NULL;
        rose_loopback_neigh->dev       = NULL;
        rose_loopback_neigh->count     = 0;
        rose_loopback_neigh->use       = 0;
        rose_loopback_neigh->dce_mode  = 1;
        rose_loopback_neigh->loopback  = 1;
        rose_loopback_neigh->number    = rose_neigh_no++;
        rose_loopback_neigh->restarted = 1;

        skb_queue_head_init(&rose_loopback_neigh->queue);

        init_timer(&rose_loopback_neigh->ftimer);
        init_timer(&rose_loopback_neigh->t0timer);

        save_flags(flags); cli();
        rose_loopback_neigh->next = rose_neigh_list;
        rose_neigh_list           = rose_loopback_neigh;
        restore_flags(flags);

        return 0;
}

/*
 *      Add a loopback node.
 */
int rose_add_loopback_node(rose_address *address)
{
        struct rose_node *rose_node;
        unsigned long flags;

        for (rose_node = rose_node_list; rose_node != NULL; rose_node = rose_node->next)
                if ((rose_node->mask == 10) && (rosecmpm(address, &rose_node->address, 10) == 0) && rose_node->loopback)
                        break;

        if (rose_node != NULL) return 0;
        
        if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL)
                return -ENOMEM;

        rose_node->address      = *address;
        rose_node->mask         = 10;
        rose_node->count        = 1;
        rose_node->loopback     = 1;
        rose_node->neighbour[0] = rose_loopback_neigh;

        /* Insert at the head of list. Address is always mask=10 */
        save_flags(flags); cli();
        rose_node->next = rose_node_list;
        rose_node_list  = rose_node;
        restore_flags(flags);

        rose_loopback_neigh->count++;

        return 0;
}

/*
 *      Delete a loopback node.
 */
void rose_del_loopback_node(rose_address *address)
{
        struct rose_node *rose_node;

        for (rose_node = rose_node_list; rose_node != NULL; rose_node = rose_node->next)
                if ((rose_node->mask == 10) && (rosecmpm(address, &rose_node->address, 10) == 0) && rose_node->loopback)
                        break;

        if (rose_node == NULL) return;

        rose_remove_node(rose_node);

        rose_loopback_neigh->count--;
}

/*
 *      A device has been removed. Remove its routes and neighbours.
 */
void rose_rt_device_down(struct net_device *dev)
{
        struct rose_neigh *s, *rose_neigh = rose_neigh_list;
        struct rose_node  *t, *rose_node;
        int i;

        while (rose_neigh != NULL) {
                s          = rose_neigh;
                rose_neigh = rose_neigh->next;

                if (s->dev == dev) {
                        rose_node = rose_node_list;

                        while (rose_node != NULL) {
                                t         = rose_node;
                                rose_node = rose_node->next;

                                for (i = 0; i < t->count; i++) {
                                        if (t->neighbour[i] == s) {
                                                t->count--;

                                                switch (i) {
                                                        case 0:
                                                                t->neighbour[0] = t->neighbour[1];
                                                        case 1:
                                                                t->neighbour[1] = t->neighbour[2];
                                                        case 2:
                                                                break;
                                                }
                                        }
                                }

                                if (t->count <= 0)
                                        rose_remove_node(t);
                        }

                        rose_remove_neigh(s);
                }
        }
}

/*
 *      A device has been removed. Remove its links.
 */
void rose_route_device_down(struct net_device *dev)
{
        struct rose_route *s, *rose_route = rose_route_list;

        while (rose_route != NULL) {
                s          = rose_route;
                rose_route = rose_route->next;

                if (s->neigh1->dev == dev || s->neigh2->dev == dev)
                        rose_remove_route(s);
        }
}

/*
 *      Clear all nodes and neighbours out, except for neighbours with
 *      active connections going through them.
 *  Do not clear loopback neighbour and nodes.
 */
static int rose_clear_routes(void)
{
        struct rose_neigh *s, *rose_neigh = rose_neigh_list;
        struct rose_node  *t, *rose_node  = rose_node_list;

        while (rose_node != NULL) {
                t         = rose_node;
                rose_node = rose_node->next;
                if (!t->loopback)
                        rose_remove_node(t);
        }

        while (rose_neigh != NULL) {
                s          = rose_neigh;
                rose_neigh = rose_neigh->next;

                if (s->use == 0 && !s->loopback) {
                        s->count = 0;
                        rose_remove_neigh(s);
                }
        }

        return 0;
}

/*
 *      Check that the device given is a valid AX.25 interface that is "up".
 */
struct net_device *rose_ax25_dev_get(char *devname)
{
        struct net_device *dev;

        if ((dev = dev_get_by_name(devname)) == NULL)
                return NULL;

        if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
                return dev;

        dev_put(dev);
        return NULL;
}

/*
 *      Find the first active ROSE device, usually "rose0".
 */
struct net_device *rose_dev_first(void)
{
        struct net_device *dev, *first = NULL;

        read_lock(&dev_base_lock);
        for (dev = dev_base; dev != NULL; dev = dev->next) {
                if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
                        if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
                                first = dev;
        }
        read_unlock(&dev_base_lock);

        return first;
}

/*
 *      Find the ROSE device for the given address.
 */
struct net_device *rose_dev_get(rose_address *addr)
{
        struct net_device *dev;

        read_lock(&dev_base_lock);
        for (dev = dev_base; dev != NULL; dev = dev->next) {
                if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
                        dev_hold(dev);
                        goto out;
                }
        }
out:
        read_unlock(&dev_base_lock);
        return dev;
}

static int rose_dev_exists(rose_address *addr)
{
        struct net_device *dev;

        read_lock(&dev_base_lock);
        for (dev = dev_base; dev != NULL; dev = dev->next) {
                if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
                        goto out;
        }
out:
        read_unlock(&dev_base_lock);
        return dev != NULL;
}




struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
{
        struct rose_route *rose_route;

        for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
                if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
                    (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
                        return rose_route;

        return NULL;
}

/*
 *      Find a neighbour given a ROSE address.
 */
struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, unsigned char *diagnostic)
{
        struct rose_node *node;
        int failed = 0;
        int i;

        for (node = rose_node_list; node != NULL; node = node->next) {
                if (rosecmpm(addr, &node->address, node->mask) == 0) {
                        for (i = 0; i < node->count; i++) {
                                if (!rose_ftimer_running(node->neighbour[i])) {
                                        return node->neighbour[i]; }
                                else
                                        failed = 1;
                        }
                        break;
                }
        }

        if (failed) {
                *cause      = ROSE_OUT_OF_ORDER;
                *diagnostic = 0;
        } else {
                *cause      = ROSE_NOT_OBTAINABLE;
                *diagnostic = 0;
        }

        return NULL;
}

/*
 *      Handle the ioctls that control the routing functions.
 */
int rose_rt_ioctl(unsigned int cmd, void *arg)
{
        struct rose_route_struct rose_route;
        struct net_device *dev;
        int err;

        switch (cmd) {

                case SIOCADDRT:
                        if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
                                return -EFAULT;
                        if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
                                return -EINVAL;
                        if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
                                dev_put(dev);
                                return -EINVAL;
                        }
                        if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
                                return -EINVAL;

                        err = rose_add_node(&rose_route, dev);
                        dev_put(dev);
                        return err;

                case SIOCDELRT:
                        if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
                                return -EFAULT;
                        if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
                                return -EINVAL;
                        err = rose_del_node(&rose_route, dev);
                        dev_put(dev);
                        return err;
                                

                case SIOCRSCLRRT:
                        return rose_clear_routes();

                default:
                        return -EINVAL;
        }

        return 0;
}

static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
{
        struct rose_route *rose_route, *s;

        rose_neigh->restarted = 0;

        rose_stop_t0timer(rose_neigh);
        rose_start_ftimer(rose_neigh);

        skb_queue_purge(&rose_neigh->queue);

        rose_route = rose_route_list;

        while (rose_route != NULL) {
                if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
                    (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
                    (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
                        s = rose_route->next;
                        rose_remove_route(rose_route);
                        rose_route = s;
                        continue;
                }

                if (rose_route->neigh1 == rose_neigh) {
                        rose_route->neigh1->use--;
                        rose_route->neigh1 = NULL;
                        rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
                }

                if (rose_route->neigh2 == rose_neigh) {
                        rose_route->neigh2->use--;
                        rose_route->neigh2 = NULL;
                        rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
                }

                rose_route = rose_route->next;
        }
}

/*
 *      A level 2 link has timed out, therefore it appears to be a poor link,
 *      then don't use that neighbour until it is reset. Blow away all through
 *      routes and connections using this route.
 */
void rose_link_failed(ax25_cb *ax25, int reason)
{
        struct rose_neigh *rose_neigh;

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next)
                if (rose_neigh->ax25 == ax25)
                        break;

        if (rose_neigh == NULL) return;

        rose_neigh->ax25 = NULL;

        rose_del_route_by_neigh(rose_neigh);
        rose_kill_by_neigh(rose_neigh);
}

/*
 *      A device has been "downed" remove its link status. Blow away all
 *      through routes and connections that use this device.
 */
void rose_link_device_down(struct net_device *dev)
{
        struct rose_neigh *rose_neigh;

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
                if (rose_neigh->dev == dev) {
                        rose_del_route_by_neigh(rose_neigh);
                        rose_kill_by_neigh(rose_neigh);
                }
        }
}

/*
 *      Route a frame to an appropriate AX.25 connection.
 */
int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
{
        struct rose_neigh *rose_neigh, *new_neigh;
        struct rose_route *rose_route;
        struct rose_facilities_struct facilities;
        rose_address *src_addr, *dest_addr;
        struct sock *sk;
        unsigned short frametype;
        unsigned int lci, new_lci;
        unsigned char cause, diagnostic;
        struct net_device *dev;
        unsigned long flags;
        int len;

#if 0
        if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
                return 0;
#endif

        frametype = skb->data[2];
        lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
        src_addr  = (rose_address *)(skb->data + 9);
        dest_addr = (rose_address *)(skb->data + 4);

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next)
                if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && ax25->ax25_dev->dev == rose_neigh->dev)
                        break;

        if (rose_neigh == NULL) {
                printk("rose_route : unknown neighbour or device %s\n", ax2asc(&ax25->dest_addr));
                return 0;
        }

        /*
         *      Obviously the link is working, halt the ftimer.
         */
        rose_stop_ftimer(rose_neigh);

        /*
         *      LCI of zero is always for us, and its always a restart
         *      frame.
         */
        if (lci == 0) {
                rose_link_rx_restart(skb, rose_neigh, frametype);
                return 0;
        }

        /*
         *      Find an existing socket.
         */
        if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
                if (frametype == ROSE_CALL_REQUEST) {
                        /* Remove an existing unused socket */
                        rose_clear_queues(sk);
                        sk->protinfo.rose->cause      = ROSE_NETWORK_CONGESTION;
                        sk->protinfo.rose->diagnostic = 0;
                        sk->protinfo.rose->neighbour->use--;
                        sk->protinfo.rose->neighbour = NULL;
                        sk->protinfo.rose->lci   = 0;
                        sk->protinfo.rose->state = ROSE_STATE_0;
                        sk->state                = TCP_CLOSE;
                        sk->err                  = 0;
                        sk->shutdown            |= SEND_SHUTDOWN;
                        if (!sk->dead)
                                sk->state_change(sk);
                        sk->dead                 = 1;
                }
                else {
                        skb->h.raw = skb->data;
                        return rose_process_rx_frame(sk, skb);
                }
        }

        /*
         *      Is is a Call Request and is it for us ?
         */
        if (frametype == ROSE_CALL_REQUEST)
                if ((dev = rose_dev_get(dest_addr)) != NULL) {
                        int err = rose_rx_call_request(skb, dev, rose_neigh, lci);
                        dev_put(dev);
                        return err;
                }

        if (!sysctl_rose_routing_control) {
                rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
                return 0;
        }

        /*
         *      Route it to the next in line if we have an entry for it.
         */
        for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) {
                if (rose_route->lci1 == lci && rose_route->neigh1 == rose_neigh) {
                        if (frametype == ROSE_CALL_REQUEST) {
                                /* F6FBB - Remove an existing unused route */
                                rose_remove_route(rose_route);
                                break;
                        } else if (rose_route->neigh2 != NULL) {
                                skb->data[0] &= 0xF0;
                                skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
                                skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
                                rose_transmit_link(skb, rose_route->neigh2);
                                if (frametype == ROSE_CLEAR_CONFIRMATION)
                                        rose_remove_route(rose_route);
                                return 1;
                        } else {
                                if (frametype == ROSE_CLEAR_CONFIRMATION)
                                        rose_remove_route(rose_route);
                                return 0;
                        }
                }
                if (rose_route->lci2 == lci && rose_route->neigh2 == rose_neigh) {
                        if (frametype == ROSE_CALL_REQUEST) {
                                /* F6FBB - Remove an existing unused route */
                                rose_remove_route(rose_route);
                                break;
                        } else if (rose_route->neigh1 != NULL) {
                                skb->data[0] &= 0xF0;
                                skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
                                skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
                                rose_transmit_link(skb, rose_route->neigh1);
                                if (frametype == ROSE_CLEAR_CONFIRMATION)
                                        rose_remove_route(rose_route);
                                return 1;
                        } else {
                                if (frametype == ROSE_CLEAR_CONFIRMATION)
                                        rose_remove_route(rose_route);
                                return 0;
                        }
                }
        }

        /*
         *      We know that:
         *      1. The frame isn't for us,
         *      2. It isn't "owned" by any existing route.
         */
        if (frametype != ROSE_CALL_REQUEST)     /* XXX */
                return 0;

        len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
        len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;

        memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
        
        if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
                rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
                return 0;
        }

        /*
         *      Check for routing loops.
         */
        for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) {
                if (rose_route->rand == facilities.rand &&
                    rosecmp(src_addr, &rose_route->src_addr) == 0 &&
                    ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
                    ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
                        rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
                        return 0;
                }
        }

        if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
                rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
                return 0;
        }

        if ((new_lci = rose_new_lci(new_neigh)) == 0) {
                rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
                return 0;
        }

        if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
                rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
                return 0;
        }

        rose_route->lci1      = lci;
        rose_route->src_addr  = *src_addr;
        rose_route->dest_addr = *dest_addr;
        rose_route->src_call  = facilities.dest_call;
        rose_route->dest_call = facilities.source_call;
        rose_route->rand      = facilities.rand;
        rose_route->neigh1    = rose_neigh;
        rose_route->lci2      = new_lci;
        rose_route->neigh2    = new_neigh;

        rose_route->neigh1->use++;
        rose_route->neigh2->use++;

        save_flags(flags); cli();
        rose_route->next = rose_route_list;
        rose_route_list  = rose_route;
        restore_flags(flags);

        skb->data[0] &= 0xF0;
        skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
        skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;

        rose_transmit_link(skb, rose_route->neigh2);

        return 1;
}

int rose_nodes_get_info(char *buffer, char **start, off_t offset, int length)
{
        struct rose_node *rose_node;
        int len     = 0;
        off_t pos   = 0;
        off_t begin = 0;
        int i;

        cli();

        len += sprintf(buffer, "address    mask n neigh neigh neigh\n");

        for (rose_node = rose_node_list; rose_node != NULL; rose_node = rose_node->next) {
                /* if (rose_node->loopback) {
                        len += sprintf(buffer + len, "%-10s %04d 1 loopback\n",
                                rose2asc(&rose_node->address),
                                rose_node->mask);
                } else { */
                        len += sprintf(buffer + len, "%-10s %04d %d",
                                rose2asc(&rose_node->address),
                                rose_node->mask,
                                rose_node->count);

                        for (i = 0; i < rose_node->count; i++)
                                len += sprintf(buffer + len, " %05d",
                                        rose_node->neighbour[i]->number);

                        len += sprintf(buffer + len, "\n");
                /* } */

                pos = begin + len;

                if (pos < offset) {
                        len   = 0;
                        begin = pos;

                }

                if (pos > offset + length)
                        break;
        }

        sti();

        *start = buffer + (offset - begin);
        len   -= (offset - begin);

        if (len > length) len = length;

        return len;
} 

int rose_neigh_get_info(char *buffer, char **start, off_t offset, int length)
{
        struct rose_neigh *rose_neigh;
        int len     = 0;
        off_t pos   = 0;
        off_t begin = 0;
        int i;

        cli();

        len += sprintf(buffer, "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");

        for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
                /* if (!rose_neigh->loopback) { */
                        len += sprintf(buffer + len, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
                                rose_neigh->number,
                                (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(&rose_neigh->callsign),
                                rose_neigh->dev ? rose_neigh->dev->name : "???",
                                rose_neigh->count,
                                rose_neigh->use,
                                (rose_neigh->dce_mode) ? "DCE" : "DTE",
                                (rose_neigh->restarted) ? "yes" : "no",
                                ax25_display_timer(&rose_neigh->t0timer) / HZ,
                                ax25_display_timer(&rose_neigh->ftimer)  / HZ);

                        if (rose_neigh->digipeat != NULL) {
                                for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
                                        len += sprintf(buffer + len, " %s", ax2asc(&rose_neigh->digipeat->calls[i]));
                        }

                        len += sprintf(buffer + len, "\n");

                        pos = begin + len;

                        if (pos < offset) {
                                len   = 0;
                                begin = pos;
                        }

                        if (pos > offset + length)
                                break;
                /* } */
        }

        sti();

        *start = buffer + (offset - begin);
        len   -= (offset - begin);

        if (len > length) len = length;

        return len;
} 

int rose_routes_get_info(char *buffer, char **start, off_t offset, int length)
{
        struct rose_route *rose_route;
        int len     = 0;
        off_t pos   = 0;
        off_t begin = 0;

        cli();

        len += sprintf(buffer, "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");

        for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) {
                if (rose_route->neigh1 != NULL) {
                        len += sprintf(buffer + len, "%3.3X  %-10s  %-9s  %05d      ",
                                rose_route->lci1,
                                rose2asc(&rose_route->src_addr),
                                ax2asc(&rose_route->src_call),
                                rose_route->neigh1->number);
                } else {
                        len += sprintf(buffer + len, "000  *           *          00000      ");
                }

                if (rose_route->neigh2 != NULL) {
                        len += sprintf(buffer + len, "%3.3X  %-10s  %-9s  %05d\n",
                                rose_route->lci2,
                                rose2asc(&rose_route->dest_addr),
                                ax2asc(&rose_route->dest_call),
                                rose_route->neigh2->number);
                } else {
                        len += sprintf(buffer + len, "000  *           *          00000\n");
                }

                pos = begin + len;

                if (pos < offset) {
                        len   = 0;
                        begin = pos;
                }

                if (pos > offset + length)
                        break;
        }

        sti();

        *start = buffer + (offset - begin);
        len   -= (offset - begin);

        if (len > length) len = length;

        return len;
} 

/*
 *      Release all memory associated with ROSE routing structures.
 */
void __exit rose_rt_free(void)
{
        struct rose_neigh *s, *rose_neigh = rose_neigh_list;
        struct rose_node  *t, *rose_node  = rose_node_list;
        struct rose_route *u, *rose_route = rose_route_list;

        while (rose_neigh != NULL) {
                s          = rose_neigh;
                rose_neigh = rose_neigh->next;

                rose_remove_neigh(s);
        }

        while (rose_node != NULL) {
                t         = rose_node;
                rose_node = rose_node->next;

                rose_remove_node(t);
        }

        while (rose_route != NULL) {
                u          = rose_route;
                rose_route = rose_route->next;

                rose_remove_route(u);
        }
}