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480 lines
11 KiB
480 lines
11 KiB
// 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 ([email protected]) |
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* Copyright (C) Jonathan Naylor G4KLX ([email protected]) |
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* Copyright (C) Steven Whitehouse GW7RRM ([email protected]) |
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* Copyright (C) Joerg Reuter DL1BKE ([email protected]) |
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* Copyright (C) Hans-Joachim Hetscher DD8NE ([email protected]) |
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* Copyright (C) Frederic Rible F1OAT ([email protected]) |
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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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unsigned char *bp; |
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int len; |
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len = digi->ndigi * AX25_ADDR_LEN; |
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if (unlikely(skb_headroom(skb) < len)) { |
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skb = skb_expand_head(skb, len); |
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if (!skb) { |
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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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} |
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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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