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/*

 *      ROSE release 003

 *

 *      This code REQUIRES 2.1.0 or higher/ NET3.029

 *

 *      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) Added use count to neighbours.

 */

#include <linux/config.h>

#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)

#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 <linux/fcntl.h>

#include <linux/termios.h>      /* For TIOCINQ/OUTQ */

#include <linux/mm.h>

#include <linux/interrupt.h>

#include <linux/notifier.h>

#include <linux/firewall.h>

#include <net/rose.h>

static unsigned int rose_neigh_no = 1;

static struct rose_node  *rose_node_list  = NULL;

static struct rose_neigh *rose_neigh_list = NULL;

static struct rose_route *rose_route_list = NULL;

static void rose_remove_neigh(struct rose_neigh *);

static int rose_del_node(struct rose_route_struct *, struct device *);

static int rose_is_null(rose_address *address)

{

        int i;

        for (i = 0 ; i < sizeof(rose_address) ; i++)

                if (address->rose_addr[i])

                        return 0;

        return 1;

}

/*

 *      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 device *dev)

{

        struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;

        struct rose_neigh *rose_neigh;

        struct rose_route_struct dummy_route;

        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;

        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 = (struct 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->number    = rose_neigh_no++;

                rose_neigh->restarted = 0;

                skb_queue_head_init(&rose_neigh->queue);

                rose_neigh->t0timer   = 0;

                rose_neigh->ftimer    = 0;

                init_timer(&rose_neigh->timer);

                if (rose_route->ndigis != 0) {

                        if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {

                                kfree_s(rose_neigh, sizeof(*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 = (struct 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->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++;

        } else if (rose_node->count < ROSE_MAX_ALTERNATE) {

                /* We have space, slot it in */

                rose_node->neighbour[rose_node->count] = rose_neigh;

                rose_node->count++;

                rose_neigh->count++;

        }

        if (!rose_is_null(&rose_route->address))

        {

                /* Delete this neighbourg from the dummy node 0000000000 */

                dummy_route = *rose_route;

                dummy_route.mask = 10;

                memset(&dummy_route.address, 0, sizeof(rose_address));

                rose_del_node(&dummy_route, dev);

        }

        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_s(rose_node, sizeof(struct rose_node));

                return;

        }

        while (s != NULL && s->next != NULL) {

                if (s->next == rose_node) {

                        s->next = rose_node->next;

                        restore_flags(flags);

                        kfree_s(rose_node, sizeof(struct 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;

        struct sk_buff *skb;

        del_timer(&rose_neigh->timer);

        while ((skb = skb_dequeue(&rose_neigh->queue)) != NULL)

                kfree_skb(skb, FREE_WRITE);

        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_s(rose_neigh->digipeat, sizeof(ax25_digi));

                kfree_s(rose_neigh, sizeof(struct 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_s(rose_neigh->digipeat, sizeof(ax25_digi));

                        kfree_s(rose_neigh, sizeof(struct 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->tr1.neigh != NULL)

                rose_route->tr1.neigh->use--;

        if (rose_route->tr2.neigh != NULL)

                rose_route->tr2.neigh->use--;

        save_flags(flags);

        cli();

        if ((s = rose_route_list) == rose_route) {

                rose_route_list = rose_route->next;

                restore_flags(flags);

                kfree_s(rose_route, sizeof(struct rose_route));

                return;

        }

        while (s != NULL && s->next != NULL) {

                if (s->next == rose_route) {

                        s->next = rose_route->next;

                        restore_flags(flags);

                        kfree_s(rose_route, sizeof(struct 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 device *dev)

{

        struct rose_node  *rose_node;

        struct rose_neigh *rose_neigh;

        struct rose_route_struct dummy_route;

        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;

        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) {

                                /* Add a dummy node to keep the neighbourg still visible */

                                dummy_route = *rose_route;

                                dummy_route.mask = 10;

                                memset(&dummy_route.address, 0, sizeof(rose_address));

                                rose_add_node(&dummy_route, dev);

                        }

                        /* 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;

}

/*

 *      A device has been removed. Remove its routes and neighbours.

 */

void rose_rt_device_down(struct 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 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->tr1.neigh->dev == dev || s->tr2.neigh->dev == dev)

                        rose_remove_route(s);

        }

}

/*

 *      Clear all nodes and neighbours out, except for neighbours with

 *      active connections going through them.

 */

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;

                rose_remove_node(t);

        }

        while (rose_neigh != NULL) {

                s          = rose_neigh;

                rose_neigh = rose_neigh->next;

                s->count = 0;

                if (s->use == 0)

                        rose_remove_neigh(s);

        }

        return 0;

}

/*

 *      Check that the device given is a valid AX.25 interface that is "up".

 */

struct device *rose_ax25_dev_get(char *devname)

{

        struct device *dev;

        if ((dev = dev_get(devname)) == NULL)

                return NULL;

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

                return dev;

        return NULL;

}

/*

 *      Find the first active ROSE device, usually "rose0".

 */

struct device *rose_dev_first(void)

{

        struct device *dev, *first = NULL;

        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;

        return first;

}

/*

 *      Find the ROSE device for the given address.

 */

struct device *rose_dev_get(rose_address *addr)

{

        struct device *dev;

        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)

                        return dev;

        return 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->tr1.neigh == neigh && rose_route->tr1.lci == lci) ||

                    (rose_route->tr2.neigh == neigh && rose_route->tr2.lci == 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 (node->neighbour[i]->ftimer == 0)

                                        return node->neighbour[i];

                                else

                                        failed = 1;

                        }

                        /* do not accept other node address */

                        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 device *dev;

        int err;

        switch (cmd) {

                case SIOCADDRT:

                        if ((err = verify_area(VERIFY_READ, arg, sizeof(struct rose_route_struct))) != 0)

                                return err;

                        memcpy_fromfs(&rose_route, arg, sizeof(struct rose_route_struct));

                        if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)

                                return -EINVAL;

                        /* if (rose_dev_get(&rose_route.address) != NULL)       / Can't add routes to ourself /

                                return -EINVAL; */

                        if (rose_route.mask > 10) /* Mask can't be more than 10 digits */

                                return -EINVAL;

                        return rose_add_node(&rose_route, dev);

                case SIOCDELRT:

                        if ((err = verify_area(VERIFY_READ, arg, sizeof(struct rose_route_struct))) != 0)

                                return err;

                        memcpy_fromfs(&rose_route, arg, sizeof(struct rose_route_struct));

                        if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)

                                return -EINVAL;

                        return rose_del_node(&rose_route, dev);

                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;

        struct sk_buff    *skb;

        rose_neigh->restarted = 0;

        rose_neigh->t0timer   = 0;

        rose_neigh->ftimer    = sysctl_rose_link_fail_timeout;

        rose_link_set_timer(rose_neigh);

        while ((skb = skb_dequeue(&rose_neigh->queue)) != NULL)

                kfree_skb(skb, FREE_WRITE);

        rose_route = rose_route_list;

        while (rose_route != NULL) {

                if ((rose_route->tr1.neigh == rose_neigh && rose_route->tr2.neigh == rose_neigh) ||

                    (rose_route->tr1.neigh == rose_neigh && rose_route->tr2.neigh == NULL)       ||

                    (rose_route->tr2.neigh == rose_neigh && rose_route->tr1.neigh == NULL)) {

                        s = rose_route->next;

                        rose_remove_route(rose_route);

                        rose_route = s;

                        continue;

                }

                if (rose_route->tr1.neigh == rose_neigh) {

                        rose_route->tr1.neigh->use--;

                        rose_route->tr1.neigh = NULL;

                        rose_transmit_clear_request(rose_route->tr2.neigh, rose_route->tr2.lci, ROSE_OUT_OF_ORDER, 0);

                }

                if (rose_route->tr2.neigh == rose_neigh) {

                        rose_route->tr2.neigh->use--;

                        rose_route->tr2.neigh = NULL;

                        rose_transmit_clear_request(rose_route->tr1.neigh, rose_route->tr1.lci, 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 device *dev)

{

        struct rose_neigh *rose_neigh;