488 lines
11 KiB
C
488 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
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* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
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* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
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* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
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*/
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#include <linux/capability.h>
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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/timer.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/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/slab.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 <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <net/sock.h>
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#include <linux/uaccess.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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static ax25_route *ax25_route_list;
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DEFINE_RWLOCK(ax25_route_lock);
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void ax25_rt_device_down(struct net_device *dev)
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{
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ax25_route *s, *t, *ax25_rt;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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s = ax25_rt;
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ax25_rt = ax25_rt->next;
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if (s->dev == dev) {
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if (ax25_route_list == s) {
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ax25_route_list = s->next;
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kfree(s->digipeat);
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kfree(s);
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} else {
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for (t = ax25_route_list; t != NULL; t = t->next) {
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if (t->next == s) {
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t->next = s->next;
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kfree(s->digipeat);
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kfree(s);
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break;
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}
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}
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}
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}
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}
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write_unlock_bh(&ax25_route_lock);
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}
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static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
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{
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ax25_route *ax25_rt;
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ax25_dev *ax25_dev;
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int i;
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if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
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return -EINVAL;
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if (route->digi_count > AX25_MAX_DIGIS)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
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ax25_rt->dev == ax25_dev->dev) {
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kfree(ax25_rt->digipeat);
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ax25_rt->digipeat = NULL;
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if (route->digi_count != 0) {
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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return -ENOMEM;
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}
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route->digi_count;
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for (i = 0; i < route->digi_count; i++) {
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route->digi_addr[i];
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}
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}
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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ax25_rt = ax25_rt->next;
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}
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if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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return -ENOMEM;
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}
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refcount_set(&ax25_rt->refcount, 1);
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ax25_rt->callsign = route->dest_addr;
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ax25_rt->dev = ax25_dev->dev;
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ax25_rt->digipeat = NULL;
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ax25_rt->ip_mode = ' ';
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if (route->digi_count != 0) {
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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kfree(ax25_rt);
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return -ENOMEM;
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}
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route->digi_count;
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for (i = 0; i < route->digi_count; i++) {
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route->digi_addr[i];
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}
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}
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ax25_rt->next = ax25_route_list;
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ax25_route_list = ax25_rt;
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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void __ax25_put_route(ax25_route *ax25_rt)
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{
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kfree(ax25_rt->digipeat);
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kfree(ax25_rt);
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}
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static int ax25_rt_del(struct ax25_routes_struct *route)
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{
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ax25_route *s, *t, *ax25_rt;
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ax25_dev *ax25_dev;
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if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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s = ax25_rt;
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ax25_rt = ax25_rt->next;
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if (s->dev == ax25_dev->dev &&
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ax25cmp(&route->dest_addr, &s->callsign) == 0) {
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if (ax25_route_list == s) {
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ax25_route_list = s->next;
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ax25_put_route(s);
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} else {
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for (t = ax25_route_list; t != NULL; t = t->next) {
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if (t->next == s) {
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t->next = s->next;
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ax25_put_route(s);
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break;
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}
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}
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}
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}
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}
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
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{
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ax25_route *ax25_rt;
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ax25_dev *ax25_dev;
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int err = 0;
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if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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if (ax25_rt->dev == ax25_dev->dev &&
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ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
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switch (rt_option->cmd) {
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case AX25_SET_RT_IPMODE:
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switch (rt_option->arg) {
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case ' ':
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case 'D':
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case 'V':
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ax25_rt->ip_mode = rt_option->arg;
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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}
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ax25_rt = ax25_rt->next;
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}
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out:
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write_unlock_bh(&ax25_route_lock);
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return err;
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}
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int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
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{
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struct ax25_route_opt_struct rt_option;
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struct ax25_routes_struct route;
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switch (cmd) {
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case SIOCADDRT:
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if (copy_from_user(&route, arg, sizeof(route)))
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return -EFAULT;
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return ax25_rt_add(&route);
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case SIOCDELRT:
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if (copy_from_user(&route, arg, sizeof(route)))
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return -EFAULT;
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return ax25_rt_del(&route);
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case SIOCAX25OPTRT:
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if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
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return -EFAULT;
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return ax25_rt_opt(&rt_option);
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default:
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return -EINVAL;
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}
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}
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#ifdef CONFIG_PROC_FS
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static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(ax25_route_lock)
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{
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struct ax25_route *ax25_rt;
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int i = 1;
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read_lock(&ax25_route_lock);
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if (*pos == 0)
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return SEQ_START_TOKEN;
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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if (i == *pos)
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return ax25_rt;
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++i;
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}
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return NULL;
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}
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static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return (v == SEQ_START_TOKEN) ? ax25_route_list :
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((struct ax25_route *) v)->next;
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}
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static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
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__releases(ax25_route_lock)
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{
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read_unlock(&ax25_route_lock);
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}
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static int ax25_rt_seq_show(struct seq_file *seq, void *v)
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{
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char buf[11];
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "callsign dev mode digipeaters\n");
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else {
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struct ax25_route *ax25_rt = v;
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const char *callsign;
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int i;
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
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callsign = "default";
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else
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callsign = ax2asc(buf, &ax25_rt->callsign);
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seq_printf(seq, "%-9s %-4s",
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callsign,
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ax25_rt->dev ? ax25_rt->dev->name : "???");
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switch (ax25_rt->ip_mode) {
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case 'V':
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seq_puts(seq, " vc");
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break;
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case 'D':
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seq_puts(seq, " dg");
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break;
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default:
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seq_puts(seq, " *");
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break;
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}
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if (ax25_rt->digipeat != NULL)
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for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
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seq_printf(seq, " %s",
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ax2asc(buf, &ax25_rt->digipeat->calls[i]));
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seq_puts(seq, "\n");
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}
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return 0;
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}
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const struct seq_operations ax25_rt_seqops = {
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.start = ax25_rt_seq_start,
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.next = ax25_rt_seq_next,
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.stop = ax25_rt_seq_stop,
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.show = ax25_rt_seq_show,
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};
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#endif
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/*
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* Find AX.25 route
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*
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* Only routes with a reference count of zero can be destroyed.
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* Must be called with ax25_route_lock read locked.
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*/
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ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
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{
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ax25_route *ax25_spe_rt = NULL;
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ax25_route *ax25_def_rt = NULL;
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ax25_route *ax25_rt;
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/*
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* Bind to the physical interface we heard them on, or the default
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* route if none is found;
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*/
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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if (dev == NULL) {
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if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
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ax25_spe_rt = ax25_rt;
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
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ax25_def_rt = ax25_rt;
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} else {
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if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
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ax25_spe_rt = ax25_rt;
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
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ax25_def_rt = ax25_rt;
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}
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}
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ax25_rt = ax25_def_rt;
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if (ax25_spe_rt != NULL)
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ax25_rt = ax25_spe_rt;
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return ax25_rt;
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}
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/*
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* Adjust path: If you specify a default route and want to connect
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* a target on the digipeater path but w/o having a special route
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* set before, the path has to be truncated from your target on.
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*/
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static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
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{
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int k;
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for (k = 0; k < digipeat->ndigi; k++) {
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if (ax25cmp(addr, &digipeat->calls[k]) == 0)
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break;
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}
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digipeat->ndigi = k;
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}
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/*
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* Find which interface to use.
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*/
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int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
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{
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ax25_uid_assoc *user;
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ax25_route *ax25_rt;
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int err = 0;
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ax25_route_lock_use();
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ax25_rt = ax25_get_route(addr, NULL);
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if (!ax25_rt) {
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ax25_route_lock_unuse();
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return -EHOSTUNREACH;
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}
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if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
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err = -EHOSTUNREACH;
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goto put;
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}
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user = ax25_findbyuid(current_euid());
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if (user) {
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ax25->source_addr = user->call;
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ax25_uid_put(user);
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} else {
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if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
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err = -EPERM;
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goto put;
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}
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ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
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}
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if (ax25_rt->digipeat != NULL) {
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ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
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GFP_ATOMIC);
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if (ax25->digipeat == NULL) {
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err = -ENOMEM;
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goto put;
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}
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ax25_adjust_path(addr, ax25->digipeat);
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}
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if (ax25->sk != NULL) {
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local_bh_disable();
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bh_lock_sock(ax25->sk);
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sock_reset_flag(ax25->sk, SOCK_ZAPPED);
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bh_unlock_sock(ax25->sk);
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local_bh_enable();
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}
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put:
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ax25_route_lock_unuse();
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return err;
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}
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struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
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ax25_address *dest, ax25_digi *digi)
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{
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struct sk_buff *skbn;
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unsigned char *bp;
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int len;
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len = digi->ndigi * AX25_ADDR_LEN;
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if (skb_headroom(skb) < len) {
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if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
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printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
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return NULL;
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}
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if (skb->sk != NULL)
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skb_set_owner_w(skbn, skb->sk);
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consume_skb(skb);
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skb = skbn;
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}
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bp = skb_push(skb, len);
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ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
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return skb;
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}
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/*
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* Free all memory associated with routing structures.
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*/
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void __exit ax25_rt_free(void)
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{
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ax25_route *s, *ax25_rt = ax25_route_list;
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write_lock_bh(&ax25_route_lock);
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while (ax25_rt != NULL) {
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s = ax25_rt;
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ax25_rt = ax25_rt->next;
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kfree(s->digipeat);
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kfree(s);
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}
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write_unlock_bh(&ax25_route_lock);
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}
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