| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) |
| * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) |
| * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) |
| * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) |
| * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) |
| * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) |
| */ |
| |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/timer.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <net/ax25.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/skbuff.h> |
| #include <linux/spinlock.h> |
| #include <net/sock.h> |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <linux/fcntl.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/init.h> |
| #include <linux/seq_file.h> |
| |
| static ax25_route *ax25_route_list; |
| static DEFINE_RWLOCK(ax25_route_lock); |
| |
| void ax25_rt_device_down(struct net_device *dev) |
| { |
| ax25_route *s, *t, *ax25_rt; |
| |
| write_lock_bh(&ax25_route_lock); |
| ax25_rt = ax25_route_list; |
| while (ax25_rt != NULL) { |
| s = ax25_rt; |
| ax25_rt = ax25_rt->next; |
| |
| if (s->dev == dev) { |
| if (ax25_route_list == s) { |
| ax25_route_list = s->next; |
| kfree(s->digipeat); |
| kfree(s); |
| } else { |
| for (t = ax25_route_list; t != NULL; t = t->next) { |
| if (t->next == s) { |
| t->next = s->next; |
| kfree(s->digipeat); |
| kfree(s); |
| break; |
| } |
| } |
| } |
| } |
| } |
| write_unlock_bh(&ax25_route_lock); |
| } |
| |
| static int __must_check ax25_rt_add(struct ax25_routes_struct *route) |
| { |
| ax25_route *ax25_rt; |
| ax25_dev *ax25_dev; |
| int i; |
| |
| if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) |
| return -EINVAL; |
| if (route->digi_count > AX25_MAX_DIGIS) |
| return -EINVAL; |
| |
| write_lock_bh(&ax25_route_lock); |
| |
| ax25_rt = ax25_route_list; |
| while (ax25_rt != NULL) { |
| if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && |
| ax25_rt->dev == ax25_dev->dev) { |
| kfree(ax25_rt->digipeat); |
| ax25_rt->digipeat = NULL; |
| if (route->digi_count != 0) { |
| if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
| write_unlock_bh(&ax25_route_lock); |
| return -ENOMEM; |
| } |
| ax25_rt->digipeat->lastrepeat = -1; |
| ax25_rt->digipeat->ndigi = route->digi_count; |
| for (i = 0; i < route->digi_count; i++) { |
| ax25_rt->digipeat->repeated[i] = 0; |
| ax25_rt->digipeat->calls[i] = route->digi_addr[i]; |
| } |
| } |
| write_unlock_bh(&ax25_route_lock); |
| return 0; |
| } |
| ax25_rt = ax25_rt->next; |
| } |
| |
| if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { |
| write_unlock_bh(&ax25_route_lock); |
| return -ENOMEM; |
| } |
| |
| atomic_set(&ax25_rt->refcount, 1); |
| ax25_rt->callsign = route->dest_addr; |
| ax25_rt->dev = ax25_dev->dev; |
| ax25_rt->digipeat = NULL; |
| ax25_rt->ip_mode = ' '; |
| if (route->digi_count != 0) { |
| if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
| write_unlock_bh(&ax25_route_lock); |
| kfree(ax25_rt); |
| return -ENOMEM; |
| } |
| ax25_rt->digipeat->lastrepeat = -1; |
| ax25_rt->digipeat->ndigi = route->digi_count; |
| for (i = 0; i < route->digi_count; i++) { |
| ax25_rt->digipeat->repeated[i] = 0; |
| ax25_rt->digipeat->calls[i] = route->digi_addr[i]; |
| } |
| } |
| ax25_rt->next = ax25_route_list; |
| ax25_route_list = ax25_rt; |
| write_unlock_bh(&ax25_route_lock); |
| |
| return 0; |
| } |
| |
| void __ax25_put_route(ax25_route *ax25_rt) |
| { |
| kfree(ax25_rt->digipeat); |
| kfree(ax25_rt); |
| } |
| |
| static int ax25_rt_del(struct ax25_routes_struct *route) |
| { |
| ax25_route *s, *t, *ax25_rt; |
| ax25_dev *ax25_dev; |
| |
| if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) |
| return -EINVAL; |
| |
| write_lock_bh(&ax25_route_lock); |
| |
| ax25_rt = ax25_route_list; |
| while (ax25_rt != NULL) { |
| s = ax25_rt; |
| ax25_rt = ax25_rt->next; |
| if (s->dev == ax25_dev->dev && |
| ax25cmp(&route->dest_addr, &s->callsign) == 0) { |
| if (ax25_route_list == s) { |
| ax25_route_list = s->next; |
| ax25_put_route(s); |
| } else { |
| for (t = ax25_route_list; t != NULL; t = t->next) { |
| if (t->next == s) { |
| t->next = s->next; |
| ax25_put_route(s); |
| break; |
| } |
| } |
| } |
| } |
| } |
| write_unlock_bh(&ax25_route_lock); |
| |
| return 0; |
| } |
| |
| static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) |
| { |
| ax25_route *ax25_rt; |
| ax25_dev *ax25_dev; |
| int err = 0; |
| |
| if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) |
| return -EINVAL; |
| |
| write_lock_bh(&ax25_route_lock); |
| |
| ax25_rt = ax25_route_list; |
| while (ax25_rt != NULL) { |
| if (ax25_rt->dev == ax25_dev->dev && |
| ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { |
| switch (rt_option->cmd) { |
| case AX25_SET_RT_IPMODE: |
| switch (rt_option->arg) { |
| case ' ': |
| case 'D': |
| case 'V': |
| ax25_rt->ip_mode = rt_option->arg; |
| break; |
| default: |
| err = -EINVAL; |
| goto out; |
| } |
| break; |
| default: |
| err = -EINVAL; |
| goto out; |
| } |
| } |
| ax25_rt = ax25_rt->next; |
| } |
| |
| out: |
| write_unlock_bh(&ax25_route_lock); |
| return err; |
| } |
| |
| int ax25_rt_ioctl(unsigned int cmd, void __user *arg) |
| { |
| struct ax25_route_opt_struct rt_option; |
| struct ax25_routes_struct route; |
| |
| switch (cmd) { |
| case SIOCADDRT: |
| if (copy_from_user(&route, arg, sizeof(route))) |
| return -EFAULT; |
| return ax25_rt_add(&route); |
| |
| case SIOCDELRT: |
| if (copy_from_user(&route, arg, sizeof(route))) |
| return -EFAULT; |
| return ax25_rt_del(&route); |
| |
| case SIOCAX25OPTRT: |
| if (copy_from_user(&rt_option, arg, sizeof(rt_option))) |
| return -EFAULT; |
| return ax25_rt_opt(&rt_option); |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| |
| static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(ax25_route_lock) |
| { |
| struct ax25_route *ax25_rt; |
| int i = 1; |
| |
| read_lock(&ax25_route_lock); |
| if (*pos == 0) |
| return SEQ_START_TOKEN; |
| |
| for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { |
| if (i == *pos) |
| return ax25_rt; |
| ++i; |
| } |
| |
| return NULL; |
| } |
| |
| static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| ++*pos; |
| return (v == SEQ_START_TOKEN) ? ax25_route_list : |
| ((struct ax25_route *) v)->next; |
| } |
| |
| static void ax25_rt_seq_stop(struct seq_file *seq, void *v) |
| __releases(ax25_route_lock) |
| { |
| read_unlock(&ax25_route_lock); |
| } |
| |
| static int ax25_rt_seq_show(struct seq_file *seq, void *v) |
| { |
| char buf[11]; |
| |
| if (v == SEQ_START_TOKEN) |
| seq_puts(seq, "callsign dev mode digipeaters\n"); |
| else { |
| struct ax25_route *ax25_rt = v; |
| const char *callsign; |
| int i; |
| |
| if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) |
| callsign = "default"; |
| else |
| callsign = ax2asc(buf, &ax25_rt->callsign); |
| |
| seq_printf(seq, "%-9s %-4s", |
| callsign, |
| ax25_rt->dev ? ax25_rt->dev->name : "???"); |
| |
| switch (ax25_rt->ip_mode) { |
| case 'V': |
| seq_puts(seq, " vc"); |
| break; |
| case 'D': |
| seq_puts(seq, " dg"); |
| break; |
| default: |
| seq_puts(seq, " *"); |
| break; |
| } |
| |
| if (ax25_rt->digipeat != NULL) |
| for (i = 0; i < ax25_rt->digipeat->ndigi; i++) |
| seq_printf(seq, " %s", |
| ax2asc(buf, &ax25_rt->digipeat->calls[i])); |
| |
| seq_puts(seq, "\n"); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ax25_rt_seqops = { |
| .start = ax25_rt_seq_start, |
| .next = ax25_rt_seq_next, |
| .stop = ax25_rt_seq_stop, |
| .show = ax25_rt_seq_show, |
| }; |
| |
| static int ax25_rt_info_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &ax25_rt_seqops); |
| } |
| |
| const struct file_operations ax25_route_fops = { |
| .owner = THIS_MODULE, |
| .open = ax25_rt_info_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| #endif |
| |
| /* |
| * Find AX.25 route |
| * |
| * Only routes with a reference count of zero can be destroyed. |
| */ |
| ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
| { |
| ax25_route *ax25_spe_rt = NULL; |
| ax25_route *ax25_def_rt = NULL; |
| ax25_route *ax25_rt; |
| |
| read_lock(&ax25_route_lock); |
| /* |
| * Bind to the physical interface we heard them on, or the default |
| * route if none is found; |
| */ |
| for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { |
| if (dev == NULL) { |
| if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) |
| ax25_spe_rt = ax25_rt; |
| if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) |
| ax25_def_rt = ax25_rt; |
| } else { |
| if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) |
| ax25_spe_rt = ax25_rt; |
| if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) |
| ax25_def_rt = ax25_rt; |
| } |
| } |
| |
| ax25_rt = ax25_def_rt; |
| if (ax25_spe_rt != NULL) |
| ax25_rt = ax25_spe_rt; |
| |
| if (ax25_rt != NULL) |
| ax25_hold_route(ax25_rt); |
| |
| read_unlock(&ax25_route_lock); |
| |
| return ax25_rt; |
| } |
| |
| /* |
| * Adjust path: If you specify a default route and want to connect |
| * a target on the digipeater path but w/o having a special route |
| * set before, the path has to be truncated from your target on. |
| */ |
| static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) |
| { |
| int k; |
| |
| for (k = 0; k < digipeat->ndigi; k++) { |
| if (ax25cmp(addr, &digipeat->calls[k]) == 0) |
| break; |
| } |
| |
| digipeat->ndigi = k; |
| } |
| |
| |
| /* |
| * Find which interface to use. |
| */ |
| int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) |
| { |
| ax25_uid_assoc *user; |
| ax25_route *ax25_rt; |
| int err; |
| |
| if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL) |
| return -EHOSTUNREACH; |
| |
| if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { |
| err = -EHOSTUNREACH; |
| goto put; |
| } |
| |
| user = ax25_findbyuid(current_euid()); |
| if (user) { |
| ax25->source_addr = user->call; |
| ax25_uid_put(user); |
| } else { |
| if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
| err = -EPERM; |
| goto put; |
| } |
| ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
| } |
| |
| if (ax25_rt->digipeat != NULL) { |
| ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), |
| GFP_ATOMIC); |
| if (ax25->digipeat == NULL) { |
| err = -ENOMEM; |
| goto put; |
| } |
| ax25_adjust_path(addr, ax25->digipeat); |
| } |
| |
| if (ax25->sk != NULL) { |
| bh_lock_sock(ax25->sk); |
| sock_reset_flag(ax25->sk, SOCK_ZAPPED); |
| bh_unlock_sock(ax25->sk); |
| } |
| |
| put: |
| ax25_put_route(ax25_rt); |
| |
| return 0; |
| } |
| |
| struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, |
| ax25_address *dest, ax25_digi *digi) |
| { |
| struct sk_buff *skbn; |
| unsigned char *bp; |
| int len; |
| |
| len = digi->ndigi * AX25_ADDR_LEN; |
| |
| if (skb_headroom(skb) < len) { |
| if ((skbn = skb_realloc_headroom(skb, len)) == NULL) { |
| printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n"); |
| return NULL; |
| } |
| |
| if (skb->sk != NULL) |
| skb_set_owner_w(skbn, skb->sk); |
| |
| kfree_skb(skb); |
| |
| skb = skbn; |
| } |
| |
| bp = skb_push(skb, len); |
| |
| ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); |
| |
| return skb; |
| } |
| |
| /* |
| * Free all memory associated with routing structures. |
| */ |
| void __exit ax25_rt_free(void) |
| { |
| ax25_route *s, *ax25_rt = ax25_route_list; |
| |
| write_lock_bh(&ax25_route_lock); |
| while (ax25_rt != NULL) { |
| s = ax25_rt; |
| ax25_rt = ax25_rt->next; |
| |
| kfree(s->digipeat); |
| kfree(s); |
| } |
| write_unlock_bh(&ax25_route_lock); |
| } |