1/*
2 *	AX.25 release 037
3 *
4 *	This code REQUIRES 2.1.15 or higher/ NET3.038
5 *
6 *	This module:
7 *		This module is free software; you can redistribute it and/or
8 *		modify it under the terms of the GNU General Public License
9 *		as published by the Free Software Foundation; either version
10 *		2 of the License, or (at your option) any later version.
11 *
12 *	History
13 *	AX.25 036	Jonathan(G4KLX)	Split from af_ax25.c.
14 */
15
16#include <linux/errno.h>
17#include <linux/types.h>
18#include <linux/socket.h>
19#include <linux/in.h>
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/timer.h>
23#include <linux/string.h>
24#include <linux/sockios.h>
25#include <linux/net.h>
26#include <net/ax25.h>
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/skbuff.h>
31#include <net/sock.h>
32#include <asm/uaccess.h>
33#include <asm/system.h>
34#include <linux/fcntl.h>
35#include <linux/mm.h>
36#include <linux/interrupt.h>
37#include <linux/notifier.h>
38#include <linux/proc_fs.h>
39#include <linux/stat.h>
40#include <linux/netfilter.h>
41#include <linux/sysctl.h>
42#include <net/ip.h>
43#include <net/arp.h>
44
45/*
46 *	Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
47 */
48
49static ax25_uid_assoc *ax25_uid_list;
50
51int ax25_uid_policy = 0;
52
53ax25_address *ax25_findbyuid(uid_t uid)
54{
55	ax25_uid_assoc *ax25_uid;
56
57	for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
58		if (ax25_uid->uid == uid)
59			return &ax25_uid->call;
60	}
61
62	return NULL;
63}
64
65int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
66{
67	ax25_uid_assoc *s, *ax25_uid;
68	unsigned long flags;
69
70	switch (cmd) {
71		case SIOCAX25GETUID:
72			for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
73				if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
74					return ax25_uid->uid;
75			}
76			return -ENOENT;
77
78		case SIOCAX25ADDUID:
79			if (!capable(CAP_NET_ADMIN))
80				return -EPERM;
81			if (ax25_findbyuid(sax->sax25_uid))
82				return -EEXIST;
83			if (sax->sax25_uid == 0)
84				return -EINVAL;
85			if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
86				return -ENOMEM;
87			ax25_uid->uid  = sax->sax25_uid;
88			ax25_uid->call = sax->sax25_call;
89			save_flags(flags); cli();
90			ax25_uid->next = ax25_uid_list;
91			ax25_uid_list  = ax25_uid;
92			restore_flags(flags);
93			return 0;
94
95		case SIOCAX25DELUID:
96			if (!capable(CAP_NET_ADMIN))
97				return -EPERM;
98			for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
99				if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
100					break;
101			}
102			if (ax25_uid == NULL)
103				return -ENOENT;
104			save_flags(flags); cli();
105			if ((s = ax25_uid_list) == ax25_uid) {
106				ax25_uid_list = s->next;
107				restore_flags(flags);
108				kfree(ax25_uid);
109				return 0;
110			}
111			while (s != NULL && s->next != NULL) {
112				if (s->next == ax25_uid) {
113					s->next = ax25_uid->next;
114					restore_flags(flags);
115					kfree(ax25_uid);
116					return 0;
117				}
118				s = s->next;
119			}
120			restore_flags(flags);
121			return -ENOENT;
122
123		default:
124			return -EINVAL;
125	}
126
127	return -EINVAL;	/*NOTREACHED */
128}
129
130int ax25_uid_get_info(char *buffer, char **start, off_t offset, int length)
131{
132	ax25_uid_assoc *pt;
133	int len     = 0;
134	off_t pos   = 0;
135	off_t begin = 0;
136
137	cli();
138
139	len += sprintf(buffer, "Policy: %d\n", ax25_uid_policy);
140
141	for (pt = ax25_uid_list; pt != NULL; pt = pt->next) {
142		len += sprintf(buffer + len, "%6d %s\n", pt->uid, ax2asc(&pt->call));
143
144		pos = begin + len;
145
146		if (pos < offset) {
147			len = 0;
148			begin = pos;
149		}
150
151		if (pos > offset + length)
152			break;
153	}
154
155	sti();
156
157	*start = buffer + (offset - begin);
158	len   -= offset - begin;
159
160	if (len > length) len = length;
161
162	return len;
163}
164
165/*
166 *	Free all memory associated with UID/Callsign structures.
167 */
168void __exit ax25_uid_free(void)
169{
170	ax25_uid_assoc *s, *ax25_uid = ax25_uid_list;
171
172	while (ax25_uid != NULL) {
173		s        = ax25_uid;
174		ax25_uid = ax25_uid->next;
175
176		kfree(s);
177	}
178}
179