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1275 |
phoenix |
/*
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* NET/ROM release 007
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*
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* NET/ROM 001 Jonathan(G4KLX) First attempt.
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* NET/ROM 003 Jonathan(G4KLX) Use SIOCADDRT/SIOCDELRT ioctl values
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* for NET/ROM routes.
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* Use '*' for a blank mnemonic in /proc/net/nr_nodes.
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* Change default quality for new neighbour when same
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* as node callsign.
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* Alan Cox(GW4PTS) Added the firewall hooks.
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* NET/ROM 006 Jonathan(G4KLX) Added the setting of digipeated neighbours.
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* Tomi(OH2BNS) Routing quality and link failure changes.
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* Device refcnt fixes.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <net/arp.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/netfilter.h>
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#include <linux/init.h>
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#include <net/netrom.h>
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static unsigned int nr_neigh_no = 1;
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static struct nr_node *nr_node_list;
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static struct nr_neigh *nr_neigh_list;
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static void nr_remove_neigh(struct nr_neigh *);
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/*
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* Add a new route to a node, and in the process add the node and the
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* neighbour if it is new.
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*/
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static int nr_add_node(ax25_address *nr, const char *mnemonic, ax25_address *ax25,
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ax25_digi *ax25_digi, struct net_device *dev, int quality, int obs_count)
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{
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struct nr_node *nr_node;
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struct nr_neigh *nr_neigh;
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struct nr_route nr_route;
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struct net_device *tdev;
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unsigned long flags;
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int i, found;
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/* Can't add routes to ourself */
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if ((tdev = nr_dev_get(nr)) != NULL) {
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dev_put(tdev);
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return -EINVAL;
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}
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for (nr_node = nr_node_list; nr_node != NULL; nr_node = nr_node->next)
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if (ax25cmp(nr, &nr_node->callsign) == 0)
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break;
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for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next)
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if (ax25cmp(ax25, &nr_neigh->callsign) == 0 && nr_neigh->dev == dev)
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break;
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/*
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* The L2 link to a neighbour has failed in the past
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* and now a frame comes from this neighbour. We assume
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* it was a temporary trouble with the link and reset the
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* routes now (and not wait for a node broadcast).
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*/
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if (nr_neigh != NULL && nr_neigh->failed != 0 && quality == 0) {
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struct nr_node *node;
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for (node = nr_node_list; node != NULL; node = node->next)
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for (i = 0; i < node->count; i++)
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if (node->routes[i].neighbour == nr_neigh)
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if (i < node->which)
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node->which = i;
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}
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if (nr_neigh != NULL)
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nr_neigh->failed = 0;
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if (quality == 0 && nr_neigh != NULL && nr_node != NULL)
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return 0;
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if (nr_neigh == NULL) {
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if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL)
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return -ENOMEM;
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nr_neigh->callsign = *ax25;
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nr_neigh->digipeat = NULL;
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nr_neigh->ax25 = NULL;
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nr_neigh->dev = dev;
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nr_neigh->quality = sysctl_netrom_default_path_quality;
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nr_neigh->locked = 0;
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nr_neigh->count = 0;
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nr_neigh->number = nr_neigh_no++;
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nr_neigh->failed = 0;
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if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
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if ((nr_neigh->digipeat = kmalloc(sizeof(*ax25_digi), GFP_KERNEL)) == NULL) {
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kfree(nr_neigh);
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return -ENOMEM;
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}
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memcpy(nr_neigh->digipeat, ax25_digi, sizeof(ax25_digi));
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}
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dev_hold(nr_neigh->dev);
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save_flags(flags);
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cli();
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nr_neigh->next = nr_neigh_list;
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nr_neigh_list = nr_neigh;
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restore_flags(flags);
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}
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if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked)
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nr_neigh->quality = quality;
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if (nr_node == NULL) {
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if ((nr_node = kmalloc(sizeof(*nr_node), GFP_ATOMIC)) == NULL)
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return -ENOMEM;
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nr_node->callsign = *nr;
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strcpy(nr_node->mnemonic, mnemonic);
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nr_node->which = 0;
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nr_node->count = 1;
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nr_node->routes[0].quality = quality;
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nr_node->routes[0].obs_count = obs_count;
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nr_node->routes[0].neighbour = nr_neigh;
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save_flags(flags);
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cli();
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nr_node->next = nr_node_list;
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nr_node_list = nr_node;
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restore_flags(flags);
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nr_neigh->count++;
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return 0;
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}
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| 173 |
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if (quality != 0)
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strcpy(nr_node->mnemonic, mnemonic);
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for (found = 0, i = 0; i < nr_node->count; i++) {
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if (nr_node->routes[i].neighbour == nr_neigh) {
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nr_node->routes[i].quality = quality;
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nr_node->routes[i].obs_count = obs_count;
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| 180 |
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found = 1;
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break;
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| 182 |
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}
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| 183 |
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}
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| 185 |
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if (!found) {
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/* We have space at the bottom, slot it in */
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if (nr_node->count < 3) {
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nr_node->routes[2] = nr_node->routes[1];
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nr_node->routes[1] = nr_node->routes[0];
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| 190 |
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| 191 |
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nr_node->routes[0].quality = quality;
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| 192 |
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nr_node->routes[0].obs_count = obs_count;
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nr_node->routes[0].neighbour = nr_neigh;
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| 194 |
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| 195 |
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nr_node->which++;
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| 196 |
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nr_node->count++;
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| 197 |
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nr_neigh->count++;
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| 198 |
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} else {
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| 199 |
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/* It must be better than the worst */
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| 200 |
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if (quality > nr_node->routes[2].quality) {
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| 201 |
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nr_node->routes[2].neighbour->count--;
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| 202 |
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| 203 |
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if (nr_node->routes[2].neighbour->count == 0 && !nr_node->routes[2].neighbour->locked)
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| 204 |
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nr_remove_neigh(nr_node->routes[2].neighbour);
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| 205 |
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| 206 |
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nr_node->routes[2].quality = quality;
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| 207 |
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nr_node->routes[2].obs_count = obs_count;
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| 208 |
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nr_node->routes[2].neighbour = nr_neigh;
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| 209 |
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| 210 |
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nr_neigh->count++;
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| 211 |
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}
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| 212 |
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}
|
| 213 |
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}
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| 214 |
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| 215 |
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/* Now re-sort the routes in quality order */
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| 216 |
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switch (nr_node->count) {
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| 217 |
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case 3:
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| 218 |
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if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
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| 219 |
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switch (nr_node->which) {
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| 220 |
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case 0: nr_node->which = 1; break;
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| 221 |
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case 1: nr_node->which = 0; break;
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| 222 |
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default: break;
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| 223 |
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}
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| 224 |
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nr_route = nr_node->routes[0];
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| 225 |
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nr_node->routes[0] = nr_node->routes[1];
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| 226 |
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nr_node->routes[1] = nr_route;
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| 227 |
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}
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| 228 |
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if (nr_node->routes[2].quality > nr_node->routes[1].quality) {
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| 229 |
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switch (nr_node->which) {
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| 230 |
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case 1: nr_node->which = 2; break;
|
| 231 |
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case 2: nr_node->which = 1; break;
|
| 232 |
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default: break;
|
| 233 |
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}
|
| 234 |
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nr_route = nr_node->routes[1];
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| 235 |
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nr_node->routes[1] = nr_node->routes[2];
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| 236 |
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nr_node->routes[2] = nr_route;
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| 237 |
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}
|
| 238 |
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case 2:
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| 239 |
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if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
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| 240 |
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switch (nr_node->which) {
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| 241 |
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case 0: nr_node->which = 1; break;
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| 242 |
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case 1: nr_node->which = 0; break;
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| 243 |
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default: break;
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| 244 |
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}
|
| 245 |
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nr_route = nr_node->routes[0];
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| 246 |
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nr_node->routes[0] = nr_node->routes[1];
|
| 247 |
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nr_node->routes[1] = nr_route;
|
| 248 |
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}
|
| 249 |
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case 1:
|
| 250 |
|
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break;
|
| 251 |
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}
|
| 252 |
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|
| 253 |
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for (i = 0; i < nr_node->count; i++) {
|
| 254 |
|
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if (nr_node->routes[i].neighbour == nr_neigh) {
|
| 255 |
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if (i < nr_node->which)
|
| 256 |
|
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nr_node->which = i;
|
| 257 |
|
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break;
|
| 258 |
|
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}
|
| 259 |
|
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}
|
| 260 |
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|
| 261 |
|
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return 0;
|
| 262 |
|
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}
|
| 263 |
|
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|
| 264 |
|
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static void nr_remove_node(struct nr_node *nr_node)
|
| 265 |
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{
|
| 266 |
|
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struct nr_node *s;
|
| 267 |
|
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unsigned long flags;
|
| 268 |
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|
| 269 |
|
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save_flags(flags);
|
| 270 |
|
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cli();
|
| 271 |
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|
| 272 |
|
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if ((s = nr_node_list) == nr_node) {
|
| 273 |
|
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nr_node_list = nr_node->next;
|
| 274 |
|
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restore_flags(flags);
|
| 275 |
|
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kfree(nr_node);
|
| 276 |
|
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return;
|
| 277 |
|
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}
|
| 278 |
|
|
|
| 279 |
|
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while (s != NULL && s->next != NULL) {
|
| 280 |
|
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if (s->next == nr_node) {
|
| 281 |
|
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s->next = nr_node->next;
|
| 282 |
|
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restore_flags(flags);
|
| 283 |
|
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kfree(nr_node);
|
| 284 |
|
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return;
|
| 285 |
|
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}
|
| 286 |
|
|
|
| 287 |
|
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s = s->next;
|
| 288 |
|
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}
|
| 289 |
|
|
|
| 290 |
|
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restore_flags(flags);
|
| 291 |
|
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}
|
| 292 |
|
|
|
| 293 |
|
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static void nr_remove_neigh(struct nr_neigh *nr_neigh)
|
| 294 |
|
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{
|
| 295 |
|
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struct nr_neigh *s;
|
| 296 |
|
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unsigned long flags;
|
| 297 |
|
|
|
| 298 |
|
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save_flags(flags);
|
| 299 |
|
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cli();
|
| 300 |
|
|
|
| 301 |
|
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if ((s = nr_neigh_list) == nr_neigh) {
|
| 302 |
|
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nr_neigh_list = nr_neigh->next;
|
| 303 |
|
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restore_flags(flags);
|
| 304 |
|
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dev_put(nr_neigh->dev);
|
| 305 |
|
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if (nr_neigh->digipeat != NULL)
|
| 306 |
|
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kfree(nr_neigh->digipeat);
|
| 307 |
|
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kfree(nr_neigh);
|
| 308 |
|
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return;
|
| 309 |
|
|
}
|
| 310 |
|
|
|
| 311 |
|
|
while (s != NULL && s->next != NULL) {
|
| 312 |
|
|
if (s->next == nr_neigh) {
|
| 313 |
|
|
s->next = nr_neigh->next;
|
| 314 |
|
|
restore_flags(flags);
|
| 315 |
|
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dev_put(nr_neigh->dev);
|
| 316 |
|
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if (nr_neigh->digipeat != NULL)
|
| 317 |
|
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kfree(nr_neigh->digipeat);
|
| 318 |
|
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kfree(nr_neigh);
|
| 319 |
|
|
return;
|
| 320 |
|
|
}
|
| 321 |
|
|
|
| 322 |
|
|
s = s->next;
|
| 323 |
|
|
}
|
| 324 |
|
|
|
| 325 |
|
|
restore_flags(flags);
|
| 326 |
|
|
}
|
| 327 |
|
|
|
| 328 |
|
|
/*
|
| 329 |
|
|
* "Delete" a node. Strictly speaking remove a route to a node. The node
|
| 330 |
|
|
* is only deleted if no routes are left to it.
|
| 331 |
|
|
*/
|
| 332 |
|
|
static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev)
|
| 333 |
|
|
{
|
| 334 |
|
|
struct nr_node *nr_node;
|
| 335 |
|
|
struct nr_neigh *nr_neigh;
|
| 336 |
|
|
int i;
|
| 337 |
|
|
|
| 338 |
|
|
for (nr_node = nr_node_list; nr_node != NULL; nr_node = nr_node->next)
|
| 339 |
|
|
if (ax25cmp(callsign, &nr_node->callsign) == 0)
|
| 340 |
|
|
break;
|
| 341 |
|
|
|
| 342 |
|
|
if (nr_node == NULL) return -EINVAL;
|
| 343 |
|
|
|
| 344 |
|
|
for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next)
|
| 345 |
|
|
if (ax25cmp(neighbour, &nr_neigh->callsign) == 0 && nr_neigh->dev == dev)
|
| 346 |
|
|
break;
|
| 347 |
|
|
|
| 348 |
|
|
if (nr_neigh == NULL) return -EINVAL;
|
| 349 |
|
|
|
| 350 |
|
|
for (i = 0; i < nr_node->count; i++) {
|
| 351 |
|
|
if (nr_node->routes[i].neighbour == nr_neigh) {
|
| 352 |
|
|
nr_neigh->count--;
|
| 353 |
|
|
|
| 354 |
|
|
if (nr_neigh->count == 0 && !nr_neigh->locked)
|
| 355 |
|
|
nr_remove_neigh(nr_neigh);
|
| 356 |
|
|
|
| 357 |
|
|
nr_node->count--;
|
| 358 |
|
|
|
| 359 |
|
|
if (nr_node->count == 0) {
|
| 360 |
|
|
nr_remove_node(nr_node);
|
| 361 |
|
|
} else {
|
| 362 |
|
|
switch (i) {
|
| 363 |
|
|
case 0:
|
| 364 |
|
|
nr_node->routes[0] = nr_node->routes[1];
|
| 365 |
|
|
case 1:
|
| 366 |
|
|
nr_node->routes[1] = nr_node->routes[2];
|
| 367 |
|
|
case 2:
|
| 368 |
|
|
break;
|
| 369 |
|
|
}
|
| 370 |
|
|
}
|
| 371 |
|
|
|
| 372 |
|
|
return 0;
|
| 373 |
|
|
}
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
return -EINVAL;
|
| 377 |
|
|
}
|
| 378 |
|
|
|
| 379 |
|
|
/*
|
| 380 |
|
|
* Lock a neighbour with a quality.
|
| 381 |
|
|
*/
|
| 382 |
|
|
static int nr_add_neigh(ax25_address *callsign, ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality)
|
| 383 |
|
|
{
|
| 384 |
|
|
struct nr_neigh *nr_neigh;
|
| 385 |
|
|
unsigned long flags;
|
| 386 |
|
|
|
| 387 |
|
|
for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next) {
|
| 388 |
|
|
if (ax25cmp(callsign, &nr_neigh->callsign) == 0 && nr_neigh->dev == dev) {
|
| 389 |
|
|
nr_neigh->quality = quality;
|
| 390 |
|
|
nr_neigh->locked = 1;
|
| 391 |
|
|
return 0;
|
| 392 |
|
|
}
|
| 393 |
|
|
}
|
| 394 |
|
|
|
| 395 |
|
|
if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL)
|
| 396 |
|
|
return -ENOMEM;
|
| 397 |
|
|
|
| 398 |
|
|
nr_neigh->callsign = *callsign;
|
| 399 |
|
|
nr_neigh->digipeat = NULL;
|
| 400 |
|
|
nr_neigh->ax25 = NULL;
|
| 401 |
|
|
nr_neigh->dev = dev;
|
| 402 |
|
|
nr_neigh->quality = quality;
|
| 403 |
|
|
nr_neigh->locked = 1;
|
| 404 |
|
|
nr_neigh->count = 0;
|
| 405 |
|
|
nr_neigh->number = nr_neigh_no++;
|
| 406 |
|
|
nr_neigh->failed = 0;
|
| 407 |
|
|
|
| 408 |
|
|
if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
|
| 409 |
|
|
if ((nr_neigh->digipeat = kmalloc(sizeof(*ax25_digi), GFP_KERNEL)) == NULL) {
|
| 410 |
|
|
kfree(nr_neigh);
|
| 411 |
|
|
return -ENOMEM;
|
| 412 |
|
|
}
|
| 413 |
|
|
memcpy(nr_neigh->digipeat, ax25_digi, sizeof(ax25_digi));
|
| 414 |
|
|
}
|
| 415 |
|
|
|
| 416 |
|
|
dev_hold(nr_neigh->dev);
|
| 417 |
|
|
|
| 418 |
|
|
save_flags(flags);
|
| 419 |
|
|
cli();
|
| 420 |
|
|
|
| 421 |
|
|
nr_neigh->next = nr_neigh_list;
|
| 422 |
|
|
nr_neigh_list = nr_neigh;
|
| 423 |
|
|
|
| 424 |
|
|
restore_flags(flags);
|
| 425 |
|
|
|
| 426 |
|
|
return 0;
|
| 427 |
|
|
}
|
| 428 |
|
|
|
| 429 |
|
|
/*
|
| 430 |
|
|
* "Delete" a neighbour. The neighbour is only removed if the number
|
| 431 |
|
|
* of nodes that may use it is zero.
|
| 432 |
|
|
*/
|
| 433 |
|
|
static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality)
|
| 434 |
|
|
{
|
| 435 |
|
|
struct nr_neigh *nr_neigh;
|
| 436 |
|
|
|
| 437 |
|
|
for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next)
|
| 438 |
|
|
if (ax25cmp(callsign, &nr_neigh->callsign) == 0 && nr_neigh->dev == dev)
|
| 439 |
|
|
break;
|
| 440 |
|
|
|
| 441 |
|
|
if (nr_neigh == NULL) return -EINVAL;
|
| 442 |
|
|
|
| 443 |
|
|
nr_neigh->quality = quality;
|
| 444 |
|
|
nr_neigh->locked = 0;
|
| 445 |
|
|
|
| 446 |
|
|
if (nr_neigh->count == 0)
|
| 447 |
|
|
nr_remove_neigh(nr_neigh);
|
| 448 |
|
|
|
| 449 |
|
|
return 0;
|
| 450 |
|
|
}
|
| 451 |
|
|
|
| 452 |
|
|
/*
|
| 453 |
|
|
* Decrement the obsolescence count by one. If a route is reduced to a
|
| 454 |
|
|
* count of zero, remove it. Also remove any unlocked neighbours with
|
| 455 |
|
|
* zero nodes routing via it.
|
| 456 |
|
|
*/
|
| 457 |
|
|
static int nr_dec_obs(void)
|
| 458 |
|
|
{
|
| 459 |
|
|
struct nr_neigh *nr_neigh;
|
| 460 |
|
|
struct nr_node *s, *nr_node;
|
| 461 |
|
|
int i;
|
| 462 |
|
|
|
| 463 |
|
|
nr_node = nr_node_list;
|
| 464 |
|
|
|
| 465 |
|
|
while (nr_node != NULL) {
|
| 466 |
|
|
s = nr_node;
|
| 467 |
|
|
nr_node = nr_node->next;
|
| 468 |
|
|
|
| 469 |
|
|
for (i = 0; i < s->count; i++) {
|
| 470 |
|
|
switch (s->routes[i].obs_count) {
|
| 471 |
|
|
|
| 472 |
|
|
case 0: /* A locked entry */
|
| 473 |
|
|
break;
|
| 474 |
|
|
|
| 475 |
|
|
case 1: /* From 1 -> 0 */
|
| 476 |
|
|
nr_neigh = s->routes[i].neighbour;
|
| 477 |
|
|
|
| 478 |
|
|
nr_neigh->count--;
|
| 479 |
|
|
|
| 480 |
|
|
if (nr_neigh->count == 0 && !nr_neigh->locked)
|
| 481 |
|
|
nr_remove_neigh(nr_neigh);
|
| 482 |
|
|
|
| 483 |
|
|
s->count--;
|
| 484 |
|
|
|
| 485 |
|
|
switch (i) {
|
| 486 |
|
|
case 0:
|
| 487 |
|
|
s->routes[0] = s->routes[1];
|
| 488 |
|
|
case 1:
|
| 489 |
|
|
s->routes[1] = s->routes[2];
|
| 490 |
|
|
case 2:
|
| 491 |
|
|
break;
|
| 492 |
|
|
}
|
| 493 |
|
|
break;
|
| 494 |
|
|
|
| 495 |
|
|
default:
|
| 496 |
|
|
s->routes[i].obs_count--;
|
| 497 |
|
|
break;
|
| 498 |
|
|
|
| 499 |
|
|
}
|
| 500 |
|
|
}
|
| 501 |
|
|
|
| 502 |
|
|
if (s->count <= 0)
|
| 503 |
|
|
nr_remove_node(s);
|
| 504 |
|
|
}
|
| 505 |
|
|
|
| 506 |
|
|
return 0;
|
| 507 |
|
|
}
|
| 508 |
|
|
|
| 509 |
|
|
/*
|
| 510 |
|
|
* A device has been removed. Remove its routes and neighbours.
|
| 511 |
|
|
*/
|
| 512 |
|
|
void nr_rt_device_down(struct net_device *dev)
|
| 513 |
|
|
{
|
| 514 |
|
|
struct nr_neigh *s, *nr_neigh = nr_neigh_list;
|
| 515 |
|
|
struct nr_node *t, *nr_node;
|
| 516 |
|
|
int i;
|
| 517 |
|
|
|
| 518 |
|
|
while (nr_neigh != NULL) {
|
| 519 |
|
|
s = nr_neigh;
|
| 520 |
|
|
nr_neigh = nr_neigh->next;
|
| 521 |
|
|
|
| 522 |
|
|
if (s->dev == dev) {
|
| 523 |
|
|
nr_node = nr_node_list;
|
| 524 |
|
|
|
| 525 |
|
|
while (nr_node != NULL) {
|
| 526 |
|
|
t = nr_node;
|
| 527 |
|
|
nr_node = nr_node->next;
|
| 528 |
|
|
|
| 529 |
|
|
for (i = 0; i < t->count; i++) {
|
| 530 |
|
|
if (t->routes[i].neighbour == s) {
|
| 531 |
|
|
t->count--;
|
| 532 |
|
|
|
| 533 |
|
|
switch (i) {
|
| 534 |
|
|
case 0:
|
| 535 |
|
|
t->routes[0] = t->routes[1];
|
| 536 |
|
|
case 1:
|
| 537 |
|
|
t->routes[1] = t->routes[2];
|
| 538 |
|
|
case 2:
|
| 539 |
|
|
break;
|
| 540 |
|
|
}
|
| 541 |
|
|
}
|
| 542 |
|
|
}
|
| 543 |
|
|
|
| 544 |
|
|
if (t->count <= 0)
|
| 545 |
|
|
nr_remove_node(t);
|
| 546 |
|
|
}
|
| 547 |
|
|
|
| 548 |
|
|
nr_remove_neigh(s);
|
| 549 |
|
|
}
|
| 550 |
|
|
}
|
| 551 |
|
|
}
|
| 552 |
|
|
|
| 553 |
|
|
/*
|
| 554 |
|
|
* Check that the device given is a valid AX.25 interface that is "up".
|
| 555 |
|
|
* Or a valid ethernet interface with an AX.25 callsign binding.
|
| 556 |
|
|
*/
|
| 557 |
|
|
static struct net_device *nr_ax25_dev_get(char *devname)
|
| 558 |
|
|
{
|
| 559 |
|
|
struct net_device *dev;
|
| 560 |
|
|
|
| 561 |
|
|
if ((dev = dev_get_by_name(devname)) == NULL)
|
| 562 |
|
|
return NULL;
|
| 563 |
|
|
|
| 564 |
|
|
if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
|
| 565 |
|
|
return dev;
|
| 566 |
|
|
|
| 567 |
|
|
dev_put(dev);
|
| 568 |
|
|
return NULL;
|
| 569 |
|
|
}
|
| 570 |
|
|
|
| 571 |
|
|
/*
|
| 572 |
|
|
* Find the first active NET/ROM device, usually "nr0".
|
| 573 |
|
|
*/
|
| 574 |
|
|
struct net_device *nr_dev_first(void)
|
| 575 |
|
|
{
|
| 576 |
|
|
struct net_device *dev, *first = NULL;
|
| 577 |
|
|
|
| 578 |
|
|
read_lock(&dev_base_lock);
|
| 579 |
|
|
for (dev = dev_base; dev != NULL; dev = dev->next) {
|
| 580 |
|
|
if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM)
|
| 581 |
|
|
if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
|
| 582 |
|
|
first = dev;
|
| 583 |
|
|
}
|
| 584 |
|
|
|
| 585 |
|
|
if (first != NULL)
|
| 586 |
|
|
dev_hold(first);
|
| 587 |
|
|
|
| 588 |
|
|
read_unlock(&dev_base_lock);
|
| 589 |
|
|
|
| 590 |
|
|
return first;
|
| 591 |
|
|
}
|
| 592 |
|
|
|
| 593 |
|
|
/*
|
| 594 |
|
|
* Find the NET/ROM device for the given callsign.
|
| 595 |
|
|
*/
|
| 596 |
|
|
struct net_device *nr_dev_get(ax25_address *addr)
|
| 597 |
|
|
{
|
| 598 |
|
|
struct net_device *dev;
|
| 599 |
|
|
|
| 600 |
|
|
read_lock(&dev_base_lock);
|
| 601 |
|
|
for (dev = dev_base; dev != NULL; dev = dev->next) {
|
| 602 |
|
|
if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) {
|
| 603 |
|
|
dev_hold(dev);
|
| 604 |
|
|
goto out;
|
| 605 |
|
|
}
|
| 606 |
|
|
}
|
| 607 |
|
|
out:
|
| 608 |
|
|
read_unlock(&dev_base_lock);
|
| 609 |
|
|
return dev;
|
| 610 |
|
|
}
|
| 611 |
|
|
|
| 612 |
|
|
static ax25_digi *nr_call_to_digi(int ndigis, ax25_address *digipeaters)
|
| 613 |
|
|
{
|
| 614 |
|
|
static ax25_digi ax25_digi;
|
| 615 |
|
|
int i;
|
| 616 |
|
|
|
| 617 |
|
|
if (ndigis == 0)
|
| 618 |
|
|
return NULL;
|
| 619 |
|
|
|
| 620 |
|
|
for (i = 0; i < ndigis; i++) {
|
| 621 |
|
|
ax25_digi.calls[i] = digipeaters[i];
|
| 622 |
|
|
ax25_digi.repeated[i] = 0;
|
| 623 |
|
|
}
|
| 624 |
|
|
|
| 625 |
|
|
ax25_digi.ndigi = ndigis;
|
| 626 |
|
|
ax25_digi.lastrepeat = -1;
|
| 627 |
|
|
|
| 628 |
|
|
return &ax25_digi;
|
| 629 |
|
|
}
|
| 630 |
|
|
|
| 631 |
|
|
/*
|
| 632 |
|
|
* Handle the ioctls that control the routing functions.
|
| 633 |
|
|
*/
|
| 634 |
|
|
int nr_rt_ioctl(unsigned int cmd, void *arg)
|
| 635 |
|
|
{
|
| 636 |
|
|
struct nr_route_struct nr_route;
|
| 637 |
|
|
struct net_device *dev;
|
| 638 |
|
|
int ret;
|
| 639 |
|
|
|
| 640 |
|
|
switch (cmd) {
|
| 641 |
|
|
|
| 642 |
|
|
case SIOCADDRT:
|
| 643 |
|
|
if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
|
| 644 |
|
|
return -EFAULT;
|
| 645 |
|
|
if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
|
| 646 |
|
|
return -EINVAL;
|
| 647 |
|
|
if (nr_route.ndigis < 0 || nr_route.ndigis > AX25_MAX_DIGIS) {
|
| 648 |
|
|
dev_put(dev);
|
| 649 |
|
|
return -EINVAL;
|
| 650 |
|
|
}
|
| 651 |
|
|
switch (nr_route.type) {
|
| 652 |
|
|
case NETROM_NODE:
|
| 653 |
|
|
ret = nr_add_node(&nr_route.callsign,
|
| 654 |
|
|
nr_route.mnemonic,
|
| 655 |
|
|
&nr_route.neighbour,
|
| 656 |
|
|
nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters),
|
| 657 |
|
|
dev, nr_route.quality,
|
| 658 |
|
|
nr_route.obs_count);
|
| 659 |
|
|
break;
|
| 660 |
|
|
case NETROM_NEIGH:
|
| 661 |
|
|
ret = nr_add_neigh(&nr_route.callsign,
|
| 662 |
|
|
nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters),
|
| 663 |
|
|
dev, nr_route.quality);
|
| 664 |
|
|
break;
|
| 665 |
|
|
default:
|
| 666 |
|
|
ret = -EINVAL;
|
| 667 |
|
|
break;
|
| 668 |
|
|
}
|
| 669 |
|
|
dev_put(dev);
|
| 670 |
|
|
return ret;
|
| 671 |
|
|
|
| 672 |
|
|
case SIOCDELRT:
|
| 673 |
|
|
if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
|
| 674 |
|
|
return -EFAULT;
|
| 675 |
|
|
if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
|
| 676 |
|
|
return -EINVAL;
|
| 677 |
|
|
switch (nr_route.type) {
|
| 678 |
|
|
case NETROM_NODE:
|
| 679 |
|
|
ret = nr_del_node(&nr_route.callsign,
|
| 680 |
|
|
&nr_route.neighbour, dev);
|
| 681 |
|
|
break;
|
| 682 |
|
|
case NETROM_NEIGH:
|
| 683 |
|
|
ret = nr_del_neigh(&nr_route.callsign,
|
| 684 |
|
|
dev, nr_route.quality);
|
| 685 |
|
|
break;
|
| 686 |
|
|
default:
|
| 687 |
|
|
ret = -EINVAL;
|
| 688 |
|
|
break;
|
| 689 |
|
|
}
|
| 690 |
|
|
dev_put(dev);
|
| 691 |
|
|
return ret;
|
| 692 |
|
|
|
| 693 |
|
|
case SIOCNRDECOBS:
|
| 694 |
|
|
return nr_dec_obs();
|
| 695 |
|
|
|
| 696 |
|
|
default:
|
| 697 |
|
|
return -EINVAL;
|
| 698 |
|
|
}
|
| 699 |
|
|
|
| 700 |
|
|
return 0;
|
| 701 |
|
|
}
|
| 702 |
|
|
|
| 703 |
|
|
/*
|
| 704 |
|
|
* A level 2 link has timed out, therefore it appears to be a poor link,
|
| 705 |
|
|
* then don't use that neighbour until it is reset.
|
| 706 |
|
|
*/
|
| 707 |
|
|
void nr_link_failed(ax25_cb *ax25, int reason)
|
| 708 |
|
|
{
|
| 709 |
|
|
struct nr_neigh *nr_neigh;
|
| 710 |
|
|
struct nr_node *nr_node;
|
| 711 |
|
|
|
| 712 |
|
|
for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next)
|
| 713 |
|
|
if (nr_neigh->ax25 == ax25)
|
| 714 |
|
|
break;
|
| 715 |
|
|
|
| 716 |
|
|
if (nr_neigh == NULL) return;
|
| 717 |
|
|
|
| 718 |
|
|
nr_neigh->ax25 = NULL;
|
| 719 |
|
|
|
| 720 |
|
|
if (++nr_neigh->failed < sysctl_netrom_link_fails_count) return;
|
| 721 |
|
|
|
| 722 |
|
|
for (nr_node = nr_node_list; nr_node != NULL; nr_node = nr_node->next)
|
| 723 |
|
|
if (nr_node->which < nr_node->count && nr_node->routes[nr_node->which].neighbour == nr_neigh)
|
| 724 |
|
|
nr_node->which++;
|
| 725 |
|
|
}
|
| 726 |
|
|
|
| 727 |
|
|
/*
|
| 728 |
|
|
* Route a frame to an appropriate AX.25 connection. A NULL ax25_cb
|
| 729 |
|
|
* indicates an internally generated frame.
|
| 730 |
|
|
*/
|
| 731 |
|
|
int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25)
|
| 732 |
|
|
{
|
| 733 |
|
|
ax25_address *nr_src, *nr_dest;
|
| 734 |
|
|
struct nr_neigh *nr_neigh;
|
| 735 |
|
|
struct nr_node *nr_node;
|
| 736 |
|
|
struct net_device *dev;
|
| 737 |
|
|
unsigned char *dptr;
|
| 738 |
|
|
|
| 739 |
|
|
|
| 740 |
|
|
nr_src = (ax25_address *)(skb->data + 0);
|
| 741 |
|
|
nr_dest = (ax25_address *)(skb->data + 7);
|
| 742 |
|
|
|
| 743 |
|
|
if (ax25 != NULL)
|
| 744 |
|
|
nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat,
|
| 745 |
|
|
ax25->ax25_dev->dev, 0, sysctl_netrom_obsolescence_count_initialiser);
|
| 746 |
|
|
|
| 747 |
|
|
if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */
|
| 748 |
|
|
int ret;
|
| 749 |
|
|
|
| 750 |
|
|
if (ax25 == NULL) /* Its from me */
|
| 751 |
|
|
ret = nr_loopback_queue(skb);
|
| 752 |
|
|
else
|
| 753 |
|
|
ret = nr_rx_frame(skb, dev);
|
| 754 |
|
|
|
| 755 |
|
|
dev_put(dev);
|
| 756 |
|
|
return ret;
|
| 757 |
|
|
}
|
| 758 |
|
|
|
| 759 |
|
|
if (!sysctl_netrom_routing_control && ax25 != NULL)
|
| 760 |
|
|
return 0;
|
| 761 |
|
|
|
| 762 |
|
|
/* Its Time-To-Live has expired */
|
| 763 |
|
|
if (--skb->data[14] == 0)
|
| 764 |
|
|
return 0;
|
| 765 |
|
|
|
| 766 |
|
|
for (nr_node = nr_node_list; nr_node != NULL; nr_node = nr_node->next)
|
| 767 |
|
|
if (ax25cmp(nr_dest, &nr_node->callsign) == 0)
|
| 768 |
|
|
break;
|
| 769 |
|
|
|
| 770 |
|
|
if (nr_node == NULL || nr_node->which >= nr_node->count)
|
| 771 |
|
|
return 0;
|
| 772 |
|
|
|
| 773 |
|
|
nr_neigh = nr_node->routes[nr_node->which].neighbour;
|
| 774 |
|
|
|
| 775 |
|
|
if ((dev = nr_dev_first()) == NULL)
|
| 776 |
|
|
return 0;
|
| 777 |
|
|
|
| 778 |
|
|
dptr = skb_push(skb, 1);
|
| 779 |
|
|
*dptr = AX25_P_NETROM;
|
| 780 |
|
|
|
| 781 |
|
|
nr_neigh->ax25 = ax25_send_frame(skb, 256, (ax25_address *)dev->dev_addr, &nr_neigh->callsign, nr_neigh->digipeat, nr_neigh->dev);
|
| 782 |
|
|
|
| 783 |
|
|
dev_put(dev);
|
| 784 |
|
|
|
| 785 |
|
|
return (nr_neigh->ax25 != NULL);
|
| 786 |
|
|
}
|
| 787 |
|
|
|
| 788 |
|
|
int nr_nodes_get_info(char *buffer, char **start, off_t offset, int length)
|
| 789 |
|
|
{
|
| 790 |
|
|
struct nr_node *nr_node;
|
| 791 |
|
|
int len = 0;
|
| 792 |
|
|
off_t pos = 0;
|
| 793 |
|
|
off_t begin = 0;
|
| 794 |
|
|
int i;
|
| 795 |
|
|
|
| 796 |
|
|
cli();
|
| 797 |
|
|
|
| 798 |
|
|
len += sprintf(buffer, "callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n");
|
| 799 |
|
|
|
| 800 |
|
|
for (nr_node = nr_node_list; nr_node != NULL; nr_node = nr_node->next) {
|
| 801 |
|
|
len += sprintf(buffer + len, "%-9s %-7s %d %d",
|
| 802 |
|
|
ax2asc(&nr_node->callsign),
|
| 803 |
|
|
(nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic,
|
| 804 |
|
|
nr_node->which + 1,
|
| 805 |
|
|
nr_node->count);
|
| 806 |
|
|
|
| 807 |
|
|
for (i = 0; i < nr_node->count; i++) {
|
| 808 |
|
|
len += sprintf(buffer + len, " %3d %d %05d",
|
| 809 |
|
|
nr_node->routes[i].quality,
|
| 810 |
|
|
nr_node->routes[i].obs_count,
|
| 811 |
|
|
nr_node->routes[i].neighbour->number);
|
| 812 |
|
|
}
|
| 813 |
|
|
|
| 814 |
|
|
len += sprintf(buffer + len, "\n");
|
| 815 |
|
|
|
| 816 |
|
|
pos = begin + len;
|
| 817 |
|
|
|
| 818 |
|
|
if (pos < offset) {
|
| 819 |
|
|
len = 0;
|
| 820 |
|
|
begin = pos;
|
| 821 |
|
|
}
|
| 822 |
|
|
|
| 823 |
|
|
if (pos > offset + length)
|
| 824 |
|
|
break;
|
| 825 |
|
|
}
|
| 826 |
|
|
|
| 827 |
|
|
sti();
|
| 828 |
|
|
|
| 829 |
|
|
*start = buffer + (offset - begin);
|
| 830 |
|
|
len -= (offset - begin);
|
| 831 |
|
|
|
| 832 |
|
|
if (len > length) len = length;
|
| 833 |
|
|
|
| 834 |
|
|
return len;
|
| 835 |
|
|
}
|
| 836 |
|
|
|
| 837 |
|
|
int nr_neigh_get_info(char *buffer, char **start, off_t offset, int length)
|
| 838 |
|
|
{
|
| 839 |
|
|
struct nr_neigh *nr_neigh;
|
| 840 |
|
|
int len = 0;
|
| 841 |
|
|
off_t pos = 0;
|
| 842 |
|
|
off_t begin = 0;
|
| 843 |
|
|
int i;
|
| 844 |
|
|
|
| 845 |
|
|
cli();
|
| 846 |
|
|
|
| 847 |
|
|
len += sprintf(buffer, "addr callsign dev qual lock count failed digipeaters\n");
|
| 848 |
|
|
|
| 849 |
|
|
for (nr_neigh = nr_neigh_list; nr_neigh != NULL; nr_neigh = nr_neigh->next) {
|
| 850 |
|
|
len += sprintf(buffer + len, "%05d %-9s %-4s %3d %d %3d %3d",
|
| 851 |
|
|
nr_neigh->number,
|
| 852 |
|
|
ax2asc(&nr_neigh->callsign),
|
| 853 |
|
|
nr_neigh->dev ? nr_neigh->dev->name : "???",
|
| 854 |
|
|
nr_neigh->quality,
|
| 855 |
|
|
nr_neigh->locked,
|
| 856 |
|
|
nr_neigh->count,
|
| 857 |
|
|
nr_neigh->failed);
|
| 858 |
|
|
|
| 859 |
|
|
if (nr_neigh->digipeat != NULL) {
|
| 860 |
|
|
for (i = 0; i < nr_neigh->digipeat->ndigi; i++)
|
| 861 |
|
|
len += sprintf(buffer + len, " %s", ax2asc(&nr_neigh->digipeat->calls[i]));
|
| 862 |
|
|
}
|
| 863 |
|
|
|
| 864 |
|
|
len += sprintf(buffer + len, "\n");
|
| 865 |
|
|
|
| 866 |
|
|
pos = begin + len;
|
| 867 |
|
|
|
| 868 |
|
|
if (pos < offset) {
|
| 869 |
|
|
len = 0;
|
| 870 |
|
|
begin = pos;
|
| 871 |
|
|
}
|
| 872 |
|
|
|
| 873 |
|
|
if (pos > offset + length)
|
| 874 |
|
|
break;
|
| 875 |
|
|
}
|
| 876 |
|
|
|
| 877 |
|
|
sti();
|
| 878 |
|
|
|
| 879 |
|
|
*start = buffer + (offset - begin);
|
| 880 |
|
|
len -= (offset - begin);
|
| 881 |
|
|
|
| 882 |
|
|
if (len > length) len = length;
|
| 883 |
|
|
|
| 884 |
|
|
return len;
|
| 885 |
|
|
}
|
| 886 |
|
|
|
| 887 |
|
|
/*
|
| 888 |
|
|
* Free all memory associated with the nodes and routes lists.
|
| 889 |
|
|
*/
|
| 890 |
|
|
void __exit nr_rt_free(void)
|
| 891 |
|
|
{
|
| 892 |
|
|
struct nr_neigh *s, *nr_neigh = nr_neigh_list;
|
| 893 |
|
|
struct nr_node *t, *nr_node = nr_node_list;
|
| 894 |
|
|
|
| 895 |
|
|
while (nr_node != NULL) {
|
| 896 |
|
|
t = nr_node;
|
| 897 |
|
|
nr_node = nr_node->next;
|
| 898 |
|
|
|
| 899 |
|
|
nr_remove_node(t);
|
| 900 |
|
|
}
|
| 901 |
|
|
|
| 902 |
|
|
while (nr_neigh != NULL) {
|
| 903 |
|
|
s = nr_neigh;
|
| 904 |
|
|
nr_neigh = nr_neigh->next;
|
| 905 |
|
|
|
| 906 |
|
|
nr_remove_neigh(s);
|
| 907 |
|
|
}
|
| 908 |
|
|
}
|
