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Linux/net/ax25/ax25_iface.c

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  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License as published by
  4  * the Free Software Foundation; either version 2 of the License, or
  5  * (at your option) any later version.
  6  *
  7  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
  8  */
  9 #include <linux/errno.h>
 10 #include <linux/types.h>
 11 #include <linux/socket.h>
 12 #include <linux/in.h>
 13 #include <linux/kernel.h>
 14 #include <linux/module.h>
 15 #include <linux/spinlock.h>
 16 #include <linux/timer.h>
 17 #include <linux/string.h>
 18 #include <linux/sockios.h>
 19 #include <linux/net.h>
 20 #include <linux/slab.h>
 21 #include <net/ax25.h>
 22 #include <linux/inet.h>
 23 #include <linux/netdevice.h>
 24 #include <linux/skbuff.h>
 25 #include <net/sock.h>
 26 #include <linux/uaccess.h>
 27 #include <linux/fcntl.h>
 28 #include <linux/mm.h>
 29 #include <linux/interrupt.h>
 30 
 31 static struct ax25_protocol *protocol_list;
 32 static DEFINE_RWLOCK(protocol_list_lock);
 33 
 34 static HLIST_HEAD(ax25_linkfail_list);
 35 static DEFINE_SPINLOCK(linkfail_lock);
 36 
 37 static struct listen_struct {
 38         struct listen_struct *next;
 39         ax25_address  callsign;
 40         struct net_device *dev;
 41 } *listen_list = NULL;
 42 static DEFINE_SPINLOCK(listen_lock);
 43 
 44 /*
 45  * Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
 46  * AX25_P_IP or AX25_P_ARP ...
 47  */
 48 void ax25_register_pid(struct ax25_protocol *ap)
 49 {
 50         write_lock_bh(&protocol_list_lock);
 51         ap->next = protocol_list;
 52         protocol_list = ap;
 53         write_unlock_bh(&protocol_list_lock);
 54 }
 55 
 56 EXPORT_SYMBOL_GPL(ax25_register_pid);
 57 
 58 void ax25_protocol_release(unsigned int pid)
 59 {
 60         struct ax25_protocol *protocol;
 61 
 62         write_lock_bh(&protocol_list_lock);
 63         protocol = protocol_list;
 64         if (protocol == NULL)
 65                 goto out;
 66 
 67         if (protocol->pid == pid) {
 68                 protocol_list = protocol->next;
 69                 goto out;
 70         }
 71 
 72         while (protocol != NULL && protocol->next != NULL) {
 73                 if (protocol->next->pid == pid) {
 74                         protocol->next = protocol->next->next;
 75                         goto out;
 76                 }
 77 
 78                 protocol = protocol->next;
 79         }
 80 out:
 81         write_unlock_bh(&protocol_list_lock);
 82 }
 83 
 84 EXPORT_SYMBOL(ax25_protocol_release);
 85 
 86 void ax25_linkfail_register(struct ax25_linkfail *lf)
 87 {
 88         spin_lock_bh(&linkfail_lock);
 89         hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
 90         spin_unlock_bh(&linkfail_lock);
 91 }
 92 
 93 EXPORT_SYMBOL(ax25_linkfail_register);
 94 
 95 void ax25_linkfail_release(struct ax25_linkfail *lf)
 96 {
 97         spin_lock_bh(&linkfail_lock);
 98         hlist_del_init(&lf->lf_node);
 99         spin_unlock_bh(&linkfail_lock);
100 }
101 
102 EXPORT_SYMBOL(ax25_linkfail_release);
103 
104 int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
105 {
106         struct listen_struct *listen;
107 
108         if (ax25_listen_mine(callsign, dev))
109                 return 0;
110 
111         if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
112                 return -ENOMEM;
113 
114         listen->callsign = *callsign;
115         listen->dev      = dev;
116 
117         spin_lock_bh(&listen_lock);
118         listen->next = listen_list;
119         listen_list  = listen;
120         spin_unlock_bh(&listen_lock);
121 
122         return 0;
123 }
124 
125 EXPORT_SYMBOL(ax25_listen_register);
126 
127 void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
128 {
129         struct listen_struct *s, *listen;
130 
131         spin_lock_bh(&listen_lock);
132         listen = listen_list;
133         if (listen == NULL) {
134                 spin_unlock_bh(&listen_lock);
135                 return;
136         }
137 
138         if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
139                 listen_list = listen->next;
140                 spin_unlock_bh(&listen_lock);
141                 kfree(listen);
142                 return;
143         }
144 
145         while (listen != NULL && listen->next != NULL) {
146                 if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
147                         s = listen->next;
148                         listen->next = listen->next->next;
149                         spin_unlock_bh(&listen_lock);
150                         kfree(s);
151                         return;
152                 }
153 
154                 listen = listen->next;
155         }
156         spin_unlock_bh(&listen_lock);
157 }
158 
159 EXPORT_SYMBOL(ax25_listen_release);
160 
161 int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
162 {
163         int (*res)(struct sk_buff *, ax25_cb *) = NULL;
164         struct ax25_protocol *protocol;
165 
166         read_lock(&protocol_list_lock);
167         for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
168                 if (protocol->pid == pid) {
169                         res = protocol->func;
170                         break;
171                 }
172         read_unlock(&protocol_list_lock);
173 
174         return res;
175 }
176 
177 int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
178 {
179         struct listen_struct *listen;
180 
181         spin_lock_bh(&listen_lock);
182         for (listen = listen_list; listen != NULL; listen = listen->next)
183                 if (ax25cmp(&listen->callsign, callsign) == 0 &&
184                     (listen->dev == dev || listen->dev == NULL)) {
185                         spin_unlock_bh(&listen_lock);
186                         return 1;
187         }
188         spin_unlock_bh(&listen_lock);
189 
190         return 0;
191 }
192 
193 void ax25_link_failed(ax25_cb *ax25, int reason)
194 {
195         struct ax25_linkfail *lf;
196 
197         spin_lock_bh(&linkfail_lock);
198         hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node)
199                 lf->func(ax25, reason);
200         spin_unlock_bh(&linkfail_lock);
201 }
202 
203 int ax25_protocol_is_registered(unsigned int pid)
204 {
205         struct ax25_protocol *protocol;
206         int res = 0;
207 
208         read_lock_bh(&protocol_list_lock);
209         for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
210                 if (protocol->pid == pid) {
211                         res = 1;
212                         break;
213                 }
214         read_unlock_bh(&protocol_list_lock);
215 
216         return res;
217 }
218 

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