Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic HDLC support routines for Linux | |
3 | * X.25 support | |
4 | * | |
eb2a2fd9 | 5 | * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> |
1da177e4 LT |
6 | * |
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 | ||
eb2a2fd9 KH |
28 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr); |
29 | ||
1da177e4 LT |
30 | /* These functions are callbacks called by LAPB layer */ |
31 | ||
32 | static 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 | ||
51 | static void x25_connected(struct net_device *dev, int reason) | |
52 | { | |
53 | x25_connect_disconnect(dev, reason, 1); | |
54 | } | |
55 | ||
56 | ||
57 | ||
58 | static void x25_disconnected(struct net_device *dev, int reason) | |
59 | { | |
60 | x25_connect_disconnect(dev, reason, 2); | |
61 | } | |
62 | ||
63 | ||
64 | ||
65 | static 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 | ||
83 | static 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 | ||
91 | static 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 | ||
138 | static 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 | ||
158 | static void x25_close(struct net_device *dev) | |
159 | { | |
160 | lapb_unregister(dev); | |
161 | } | |
162 | ||
163 | ||
164 | ||
165 | static int x25_rx(struct sk_buff *skb) | |
166 | { | |
1da177e4 | 167 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
198191c4 | 168 | skb->dev->stats.rx_dropped++; |
1da177e4 LT |
169 | return NET_RX_DROP; |
170 | } | |
171 | ||
172 | if (lapb_data_received(skb->dev, skb) == LAPB_OK) | |
173 | return NET_RX_SUCCESS; | |
174 | ||
198191c4 | 175 | skb->dev->stats.rx_errors++; |
1da177e4 LT |
176 | dev_kfree_skb_any(skb); |
177 | return NET_RX_DROP; | |
178 | } | |
179 | ||
180 | ||
eb2a2fd9 KH |
181 | static struct hdlc_proto proto = { |
182 | .open = x25_open, | |
183 | .close = x25_close, | |
184 | .ioctl = x25_ioctl, | |
40d25142 | 185 | .netif_rx = x25_rx, |
eb2a2fd9 KH |
186 | .module = THIS_MODULE, |
187 | }; | |
188 | ||
1da177e4 | 189 | |
eb2a2fd9 | 190 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr) |
1da177e4 LT |
191 | { |
192 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
193 | int result; | |
194 | ||
195 | switch (ifr->ifr_settings.type) { | |
196 | case IF_GET_PROTO: | |
eb2a2fd9 KH |
197 | if (dev_to_hdlc(dev)->proto != &proto) |
198 | return -EINVAL; | |
1da177e4 LT |
199 | ifr->ifr_settings.type = IF_PROTO_X25; |
200 | return 0; /* return protocol only, no settable parameters */ | |
201 | ||
202 | case IF_PROTO_X25: | |
203 | if(!capable(CAP_NET_ADMIN)) | |
204 | return -EPERM; | |
205 | ||
206 | if(dev->flags & IFF_UP) | |
207 | return -EBUSY; | |
208 | ||
209 | result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); | |
210 | if (result) | |
211 | return result; | |
212 | ||
40d25142 | 213 | if ((result = attach_hdlc_protocol(dev, &proto, 0))) |
eb2a2fd9 | 214 | return result; |
1da177e4 | 215 | dev->hard_start_xmit = x25_xmit; |
1da177e4 | 216 | dev->type = ARPHRD_X25; |
4bc83b4d | 217 | netif_dormant_off(dev); |
1da177e4 LT |
218 | return 0; |
219 | } | |
220 | ||
221 | return -EINVAL; | |
222 | } | |
eb2a2fd9 KH |
223 | |
224 | ||
225 | static int __init mod_init(void) | |
226 | { | |
227 | register_hdlc_protocol(&proto); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | ||
232 | ||
233 | static void __exit mod_exit(void) | |
234 | { | |
235 | unregister_hdlc_protocol(&proto); | |
236 | } | |
237 | ||
238 | ||
239 | module_init(mod_init); | |
240 | module_exit(mod_exit); | |
241 | ||
242 | MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); | |
243 | MODULE_DESCRIPTION("X.25 protocol support for generic HDLC"); | |
244 | MODULE_LICENSE("GPL v2"); |