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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
44
45
46static HLIST_HEAD(ax25_uid_list);
47static DEFINE_RWLOCK(ax25_uid_lock);
48
49int ax25_uid_policy;
50
51EXPORT_SYMBOL(ax25_uid_policy);
52
53ax25_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
71EXPORT_SYMBOL(ax25_findbyuid);
72
73int 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;
142}
143
144#ifdef CONFIG_PROC_FS
145
146static 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
166static 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
176static 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
182static 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
196static 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
203static int ax25_uid_info_open(struct inode *inode, struct file *file)
204{
205 return seq_open(file, &ax25_uid_seqops);
206}
207
208const 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
220
221void __exit ax25_uid_free(void)
222{
223 ax25_uid_assoc *ax25_uid;
224 struct hlist_node *node;
225
226 write_lock(&ax25_uid_lock);
227again:
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
