rose_route.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:28k
- /*
- * 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 %sn", 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 neighn");
- 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 loopbackn",
- 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 digipeatersn");
- 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 neighn");
- 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 %05dn",
- rose_route->lci2,
- rose2asc(&rose_route->dest_addr),
- ax2asc(&rose_route->dest_call),
- rose_route->neigh2->number);
- } else {
- len += sprintf(buffer + len, "000 * * 00000n");
- }
- 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);
- }
- }