blob: e4bb9f8ad4337e1cb34bb7b9835732119877c3b3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic HDLC support routines for Linux
3 * X.25 support
4 *
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +02005 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License
9 * as published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/poll.h>
16#include <linux/errno.h>
17#include <linux/if_arp.h>
18#include <linux/init.h>
19#include <linux/skbuff.h>
20#include <linux/pkt_sched.h>
21#include <linux/inetdevice.h>
22#include <linux/lapb.h>
23#include <linux/rtnetlink.h>
24#include <linux/hdlc.h>
25
26#include <net/x25device.h>
27
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +020028static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030/* These functions are callbacks called by LAPB layer */
31
32static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
33{
34 struct sk_buff *skb;
35 unsigned char *ptr;
36
37 if ((skb = dev_alloc_skb(1)) == NULL) {
38 printk(KERN_ERR "%s: out of memory\n", dev->name);
39 return;
40 }
41
42 ptr = skb_put(skb, 1);
43 *ptr = code;
44
45 skb->protocol = x25_type_trans(skb, dev);
46 netif_rx(skb);
47}
48
49
50
51static void x25_connected(struct net_device *dev, int reason)
52{
53 x25_connect_disconnect(dev, reason, 1);
54}
55
56
57
58static void x25_disconnected(struct net_device *dev, int reason)
59{
60 x25_connect_disconnect(dev, reason, 2);
61}
62
63
64
65static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
66{
67 unsigned char *ptr;
68
69 skb_push(skb, 1);
70
71 if (skb_cow(skb, 1))
72 return NET_RX_DROP;
73
74 ptr = skb->data;
75 *ptr = 0;
76
77 skb->protocol = x25_type_trans(skb, dev);
78 return netif_rx(skb);
79}
80
81
82
83static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
84{
85 hdlc_device *hdlc = dev_to_hdlc(dev);
86 hdlc->xmit(skb, dev); /* Ignore return value :-( */
87}
88
89
90
91static int x25_xmit(struct sk_buff *skb, struct net_device *dev)
92{
93 int result;
94
95
96 /* X.25 to LAPB */
97 switch (skb->data[0]) {
98 case 0: /* Data to be transmitted */
99 skb_pull(skb, 1);
100 if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
101 dev_kfree_skb(skb);
102 return 0;
103
104 case 1:
105 if ((result = lapb_connect_request(dev))!= LAPB_OK) {
106 if (result == LAPB_CONNECTED)
107 /* Send connect confirm. msg to level 3 */
108 x25_connected(dev, 0);
109 else
110 printk(KERN_ERR "%s: LAPB connect request "
111 "failed, error code = %i\n",
112 dev->name, result);
113 }
114 break;
115
116 case 2:
117 if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
118 if (result == LAPB_NOTCONNECTED)
119 /* Send disconnect confirm. msg to level 3 */
120 x25_disconnected(dev, 0);
121 else
122 printk(KERN_ERR "%s: LAPB disconnect request "
123 "failed, error code = %i\n",
124 dev->name, result);
125 }
126 break;
127
128 default: /* to be defined */
129 break;
130 }
131
132 dev_kfree_skb(skb);
133 return 0;
134}
135
136
137
138static int x25_open(struct net_device *dev)
139{
140 struct lapb_register_struct cb;
141 int result;
142
143 cb.connect_confirmation = x25_connected;
144 cb.connect_indication = x25_connected;
145 cb.disconnect_confirmation = x25_disconnected;
146 cb.disconnect_indication = x25_disconnected;
147 cb.data_indication = x25_data_indication;
148 cb.data_transmit = x25_data_transmit;
149
150 result = lapb_register(dev, &cb);
151 if (result != LAPB_OK)
152 return result;
153 return 0;
154}
155
156
157
158static void x25_close(struct net_device *dev)
159{
160 lapb_unregister(dev);
161}
162
163
164
165static int x25_rx(struct sk_buff *skb)
166{
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200167 struct hdlc_device_desc *desc = dev_to_desc(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
169 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200170 desc->stats.rx_dropped++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return NET_RX_DROP;
172 }
173
174 if (lapb_data_received(skb->dev, skb) == LAPB_OK)
175 return NET_RX_SUCCESS;
176
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200177 desc->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 dev_kfree_skb_any(skb);
179 return NET_RX_DROP;
180}
181
182
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200183static struct hdlc_proto proto = {
184 .open = x25_open,
185 .close = x25_close,
186 .ioctl = x25_ioctl,
187 .module = THIS_MODULE,
188};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200190
191static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 hdlc_device *hdlc = dev_to_hdlc(dev);
194 int result;
195
196 switch (ifr->ifr_settings.type) {
197 case IF_GET_PROTO:
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200198 if (dev_to_hdlc(dev)->proto != &proto)
199 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 ifr->ifr_settings.type = IF_PROTO_X25;
201 return 0; /* return protocol only, no settable parameters */
202
203 case IF_PROTO_X25:
204 if(!capable(CAP_NET_ADMIN))
205 return -EPERM;
206
207 if(dev->flags & IFF_UP)
208 return -EBUSY;
209
210 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
211 if (result)
212 return result;
213
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200214 if ((result = attach_hdlc_protocol(dev, &proto,
215 x25_rx, 0)) != 0)
216 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 dev->hard_start_xmit = x25_xmit;
218 dev->hard_header = NULL;
219 dev->type = ARPHRD_X25;
220 dev->addr_len = 0;
Krzysztof Halasa4bc83b42006-07-21 14:41:01 -0700221 netif_dormant_off(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return 0;
223 }
224
225 return -EINVAL;
226}
Krzysztof Halasaeb2a2fd2006-09-26 23:23:45 +0200227
228
229static int __init mod_init(void)
230{
231 register_hdlc_protocol(&proto);
232 return 0;
233}
234
235
236
237static void __exit mod_exit(void)
238{
239 unregister_hdlc_protocol(&proto);
240}
241
242
243module_init(mod_init);
244module_exit(mod_exit);
245
246MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
247MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
248MODULE_LICENSE("GPL v2");