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Linux/net/ax25/ax25_uid.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 
 10 #include <linux/capability.h>
 11 #include <linux/errno.h>
 12 #include <linux/types.h>
 13 #include <linux/socket.h>
 14 #include <linux/in.h>
 15 #include <linux/kernel.h>
 16 #include <linux/timer.h>
 17 #include <linux/string.h>
 18 #include <linux/sockios.h>
 19 #include <linux/net.h>
 20 #include <linux/spinlock.h>
 21 #include <net/ax25.h>
 22 #include <linux/inet.h>
 23 #include <linux/netdevice.h>
 24 #include <linux/if_arp.h>
 25 #include <linux/skbuff.h>
 26 #include <net/sock.h>
 27 #include <asm/uaccess.h>
 28 #include <asm/system.h>
 29 #include <linux/fcntl.h>
 30 #include <linux/mm.h>
 31 #include <linux/interrupt.h>
 32 #include <linux/list.h>
 33 #include <linux/notifier.h>
 34 #include <linux/proc_fs.h>
 35 #include <linux/seq_file.h>
 36 #include <linux/stat.h>
 37 #include <linux/netfilter.h>
 38 #include <linux/sysctl.h>
 39 #include <net/ip.h>
 40 #include <net/arp.h>
 41 
 42 /*
 43  *      Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
 44  */
 45 
 46 static HLIST_HEAD(ax25_uid_list);
 47 static DEFINE_RWLOCK(ax25_uid_lock);
 48 
 49 int ax25_uid_policy;
 50 
 51 EXPORT_SYMBOL(ax25_uid_policy);
 52 
 53 ax25_uid_assoc *ax25_findbyuid(uid_t uid)
 54 {
 55         ax25_uid_assoc *ax25_uid, *res = NULL;
 56         struct hlist_node *node;
 57 
 58         read_lock(&ax25_uid_lock);
 59         ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
 60                 if (ax25_uid->uid == uid) {
 61                         ax25_uid_hold(ax25_uid);
 62                         res = ax25_uid;
 63                         break;
 64                 }
 65         }
 66         read_unlock(&ax25_uid_lock);
 67 
 68         return res;
 69 }
 70 
 71 EXPORT_SYMBOL(ax25_findbyuid);
 72 
 73 int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
 74 {
 75         ax25_uid_assoc *ax25_uid;
 76         struct hlist_node *node;
 77         ax25_uid_assoc *user;
 78         unsigned long res;
 79 
 80         switch (cmd) {
 81         case SIOCAX25GETUID:
 82                 res = -ENOENT;
 83                 read_lock(&ax25_uid_lock);
 84                 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
 85                         if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
 86                                 res = ax25_uid->uid;
 87                                 break;
 88                         }
 89                 }
 90                 read_unlock(&ax25_uid_lock);
 91 
 92                 return res;
 93 
 94         case SIOCAX25ADDUID:
 95                 if (!capable(CAP_NET_ADMIN))
 96                         return -EPERM;
 97                 user = ax25_findbyuid(sax->sax25_uid);
 98                 if (user) {
 99                         ax25_uid_put(user);
100                         return -EEXIST;
101                 }
102                 if (sax->sax25_uid == 0)
103                         return -EINVAL;
104                 if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
105                         return -ENOMEM;
106 
107                 atomic_set(&ax25_uid->refcount, 1);
108                 ax25_uid->uid  = sax->sax25_uid;
109                 ax25_uid->call = sax->sax25_call;
110 
111                 write_lock(&ax25_uid_lock);
112                 hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
113                 write_unlock(&ax25_uid_lock);
114 
115                 return 0;
116 
117         case SIOCAX25DELUID:
118                 if (!capable(CAP_NET_ADMIN))
119                         return -EPERM;
120 
121                 ax25_uid = NULL;
122                 write_lock(&ax25_uid_lock);
123                 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
124                         if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
125                                 break;
126                 }
127                 if (ax25_uid == NULL) {
128                         write_unlock(&ax25_uid_lock);
129                         return -ENOENT;
130                 }
131                 hlist_del_init(&ax25_uid->uid_node);
132                 ax25_uid_put(ax25_uid);
133                 write_unlock(&ax25_uid_lock);
134 
135                 return 0;
136 
137         default:
138                 return -EINVAL;
139         }
140 
141         return -EINVAL; /*NOTREACHED */
142 }
143 
144 #ifdef CONFIG_PROC_FS
145 
146 static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
147         __acquires(ax25_uid_lock)
148 {
149         struct ax25_uid_assoc *pt;
150         struct hlist_node *node;
151         int i = 1;
152 
153         read_lock(&ax25_uid_lock);
154 
155         if (*pos == 0)
156                 return SEQ_START_TOKEN;
157 
158         ax25_uid_for_each(pt, node, &ax25_uid_list) {
159                 if (i == *pos)
160                         return pt;
161                 ++i;
162         }
163         return NULL;
164 }
165 
166 static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
167 {
168         ++*pos;
169         if (v == SEQ_START_TOKEN)
170                 return ax25_uid_list.first;
171         else
172                 return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next,
173                            ax25_uid_assoc, uid_node);
174 }
175 
176 static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
177         __releases(ax25_uid_lock)
178 {
179         read_unlock(&ax25_uid_lock);
180 }
181 
182 static int ax25_uid_seq_show(struct seq_file *seq, void *v)
183 {
184         char buf[11];
185 
186         if (v == SEQ_START_TOKEN)
187                 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
188         else {
189                 struct ax25_uid_assoc *pt = v;
190 
191                 seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
192         }
193         return 0;
194 }
195 
196 static const struct seq_operations ax25_uid_seqops = {
197         .start = ax25_uid_seq_start,
198         .next = ax25_uid_seq_next,
199         .stop = ax25_uid_seq_stop,
200         .show = ax25_uid_seq_show,
201 };
202 
203 static int ax25_uid_info_open(struct inode *inode, struct file *file)
204 {
205         return seq_open(file, &ax25_uid_seqops);
206 }
207 
208 const struct file_operations ax25_uid_fops = {
209         .owner = THIS_MODULE,
210         .open = ax25_uid_info_open,
211         .read = seq_read,
212         .llseek = seq_lseek,
213         .release = seq_release,
214 };
215 
216 #endif
217 
218 /*
219  *      Free all memory associated with UID/Callsign structures.
220  */
221 void __exit ax25_uid_free(void)
222 {
223         ax25_uid_assoc *ax25_uid;
224         struct hlist_node *node;
225 
226         write_lock(&ax25_uid_lock);
227 again:
228         ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
229                 hlist_del_init(&ax25_uid->uid_node);
230                 ax25_uid_put(ax25_uid);
231                 goto again;
232         }
233         write_unlock(&ax25_uid_lock);
234 }
235 

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