Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 | 12 | #include <linux/errno.h> |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
4dfce407 | 14 | #include <linux/hdlc.h> |
1da177e4 | 15 | #include <linux/if_arp.h> |
1da177e4 | 16 | #include <linux/inetdevice.h> |
4dfce407 KH |
17 | #include <linux/init.h> |
18 | #include <linux/kernel.h> | |
1da177e4 | 19 | #include <linux/lapb.h> |
4dfce407 KH |
20 | #include <linux/module.h> |
21 | #include <linux/pkt_sched.h> | |
22 | #include <linux/poll.h> | |
1da177e4 | 23 | #include <linux/rtnetlink.h> |
4dfce407 | 24 | #include <linux/skbuff.h> |
1da177e4 LT |
25 | #include <net/x25device.h> |
26 | ||
eb2a2fd9 KH |
27 | static int x25_ioctl(struct net_device *dev, struct ifreq *ifr); |
28 | ||
1da177e4 LT |
29 | /* These functions are callbacks called by LAPB layer */ |
30 | ||
31 | static void x25_connect_disconnect(struct net_device *dev, int reason, int code) | |
32 | { | |
33 | struct sk_buff *skb; | |
34 | unsigned char *ptr; | |
35 | ||
36 | if ((skb = dev_alloc_skb(1)) == NULL) { | |
12a3bfef | 37 | netdev_err(dev, "out of memory\n"); |
1da177e4 LT |
38 | return; |
39 | } | |
40 | ||
41 | ptr = skb_put(skb, 1); | |
42 | *ptr = code; | |
43 | ||
44 | skb->protocol = x25_type_trans(skb, dev); | |
45 | netif_rx(skb); | |
46 | } | |
47 | ||
48 | ||
49 | ||
50 | static void x25_connected(struct net_device *dev, int reason) | |
51 | { | |
90b3e030 | 52 | x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT); |
1da177e4 LT |
53 | } |
54 | ||
55 | ||
56 | ||
57 | static void x25_disconnected(struct net_device *dev, int reason) | |
58 | { | |
90b3e030 | 59 | x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT); |
1da177e4 LT |
60 | } |
61 | ||
62 | ||
63 | ||
64 | static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) | |
65 | { | |
66 | unsigned char *ptr; | |
67 | ||
68 | skb_push(skb, 1); | |
69 | ||
70 | if (skb_cow(skb, 1)) | |
71 | return NET_RX_DROP; | |
72 | ||
73 | ptr = skb->data; | |
90b3e030 | 74 | *ptr = X25_IFACE_DATA; |
1da177e4 LT |
75 | |
76 | skb->protocol = x25_type_trans(skb, dev); | |
77 | return netif_rx(skb); | |
78 | } | |
79 | ||
80 | ||
81 | ||
82 | static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb) | |
83 | { | |
84 | hdlc_device *hdlc = dev_to_hdlc(dev); | |
85 | hdlc->xmit(skb, dev); /* Ignore return value :-( */ | |
86 | } | |
87 | ||
88 | ||
89 | ||
d71a6749 | 90 | static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
91 | { |
92 | int result; | |
93 | ||
94 | ||
95 | /* X.25 to LAPB */ | |
96 | switch (skb->data[0]) { | |
90b3e030 | 97 | case X25_IFACE_DATA: /* Data to be transmitted */ |
1da177e4 LT |
98 | skb_pull(skb, 1); |
99 | if ((result = lapb_data_request(dev, skb)) != LAPB_OK) | |
100 | dev_kfree_skb(skb); | |
d71a6749 | 101 | return NETDEV_TX_OK; |
1da177e4 | 102 | |
90b3e030 | 103 | case X25_IFACE_CONNECT: |
1da177e4 LT |
104 | if ((result = lapb_connect_request(dev))!= LAPB_OK) { |
105 | if (result == LAPB_CONNECTED) | |
106 | /* Send connect confirm. msg to level 3 */ | |
107 | x25_connected(dev, 0); | |
108 | else | |
12a3bfef JP |
109 | netdev_err(dev, "LAPB connect request failed, error code = %i\n", |
110 | result); | |
1da177e4 LT |
111 | } |
112 | break; | |
113 | ||
90b3e030 | 114 | case X25_IFACE_DISCONNECT: |
1da177e4 LT |
115 | if ((result = lapb_disconnect_request(dev)) != LAPB_OK) { |
116 | if (result == LAPB_NOTCONNECTED) | |
117 | /* Send disconnect confirm. msg to level 3 */ | |
118 | x25_disconnected(dev, 0); | |
119 | else | |
12a3bfef JP |
120 | netdev_err(dev, "LAPB disconnect request failed, error code = %i\n", |
121 | result); | |
1da177e4 LT |
122 | } |
123 | break; | |
124 | ||
125 | default: /* to be defined */ | |
126 | break; | |
127 | } | |
128 | ||
129 | dev_kfree_skb(skb); | |
d71a6749 | 130 | return NETDEV_TX_OK; |
1da177e4 LT |
131 | } |
132 | ||
133 | ||
134 | ||
135 | static int x25_open(struct net_device *dev) | |
136 | { | |
1da177e4 | 137 | int result; |
d97a077a | 138 | static const struct lapb_register_struct cb = { |
139 | .connect_confirmation = x25_connected, | |
140 | .connect_indication = x25_connected, | |
141 | .disconnect_confirmation = x25_disconnected, | |
142 | .disconnect_indication = x25_disconnected, | |
143 | .data_indication = x25_data_indication, | |
144 | .data_transmit = x25_data_transmit, | |
145 | }; | |
1da177e4 LT |
146 | |
147 | result = lapb_register(dev, &cb); | |
148 | if (result != LAPB_OK) | |
149 | return result; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | ||
154 | ||
155 | static void x25_close(struct net_device *dev) | |
156 | { | |
157 | lapb_unregister(dev); | |
158 | } | |
159 | ||
160 | ||
161 | ||
162 | static int x25_rx(struct sk_buff *skb) | |
163 | { | |
54069511 KH |
164 | struct net_device *dev = skb->dev; |
165 | ||
1da177e4 | 166 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
54069511 | 167 | dev->stats.rx_dropped++; |
1da177e4 LT |
168 | return NET_RX_DROP; |
169 | } | |
170 | ||
54069511 | 171 | if (lapb_data_received(dev, skb) == LAPB_OK) |
1da177e4 LT |
172 | return NET_RX_SUCCESS; |
173 | ||
54069511 | 174 | dev->stats.rx_errors++; |
1da177e4 LT |
175 | dev_kfree_skb_any(skb); |
176 | return NET_RX_DROP; | |
177 | } | |
178 | ||
179 | ||
eb2a2fd9 KH |
180 | static struct hdlc_proto proto = { |
181 | .open = x25_open, | |
182 | .close = x25_close, | |
183 | .ioctl = x25_ioctl, | |
40d25142 | 184 | .netif_rx = x25_rx, |
991990a1 | 185 | .xmit = x25_xmit, |
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: | |
640462cb | 203 | if (!capable(CAP_NET_ADMIN)) |
1da177e4 LT |
204 | return -EPERM; |
205 | ||
640462cb | 206 | if (dev->flags & IFF_UP) |
1da177e4 LT |
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->type = ARPHRD_X25; |
2f8364a2 | 216 | call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); |
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"); |