1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic HDLC support routines for Linux
6 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
9 #include <linux/errno.h>
10 #include <linux/gfp.h>
11 #include <linux/hdlc.h>
12 #include <linux/if_arp.h>
13 #include <linux/inetdevice.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/lapb.h>
17 #include <linux/module.h>
18 #include <linux/pkt_sched.h>
19 #include <linux/poll.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/skbuff.h>
22 #include <net/x25device.h>
24 static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
26 /* These functions are callbacks called by LAPB layer */
28 static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
33 if ((skb = dev_alloc_skb(1)) == NULL) {
34 netdev_err(dev, "out of memory\n");
38 ptr = skb_put(skb, 1);
41 skb->protocol = x25_type_trans(skb, dev);
47 static void x25_connected(struct net_device *dev, int reason)
49 x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT);
54 static void x25_disconnected(struct net_device *dev, int reason)
56 x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT);
61 static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
71 *ptr = X25_IFACE_DATA;
73 skb->protocol = x25_type_trans(skb, dev);
79 static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
81 hdlc_device *hdlc = dev_to_hdlc(dev);
82 hdlc->xmit(skb, dev); /* Ignore return value :-( */
87 static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
93 switch (skb->data[0]) {
94 case X25_IFACE_DATA: /* Data to be transmitted */
96 if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
100 case X25_IFACE_CONNECT:
101 if ((result = lapb_connect_request(dev))!= LAPB_OK) {
102 if (result == LAPB_CONNECTED)
103 /* Send connect confirm. msg to level 3 */
104 x25_connected(dev, 0);
106 netdev_err(dev, "LAPB connect request failed, error code = %i\n",
111 case X25_IFACE_DISCONNECT:
112 if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
113 if (result == LAPB_NOTCONNECTED)
114 /* Send disconnect confirm. msg to level 3 */
115 x25_disconnected(dev, 0);
117 netdev_err(dev, "LAPB disconnect request failed, error code = %i\n",
122 default: /* to be defined */
132 static int x25_open(struct net_device *dev)
135 static const struct lapb_register_struct cb = {
136 .connect_confirmation = x25_connected,
137 .connect_indication = x25_connected,
138 .disconnect_confirmation = x25_disconnected,
139 .disconnect_indication = x25_disconnected,
140 .data_indication = x25_data_indication,
141 .data_transmit = x25_data_transmit,
144 result = lapb_register(dev, &cb);
145 if (result != LAPB_OK)
152 static void x25_close(struct net_device *dev)
154 lapb_unregister(dev);
159 static int x25_rx(struct sk_buff *skb)
161 struct net_device *dev = skb->dev;
163 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
164 dev->stats.rx_dropped++;
168 if (lapb_data_received(dev, skb) == LAPB_OK)
169 return NET_RX_SUCCESS;
171 dev->stats.rx_errors++;
172 dev_kfree_skb_any(skb);
177 static struct hdlc_proto proto = {
183 .module = THIS_MODULE,
187 static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
189 hdlc_device *hdlc = dev_to_hdlc(dev);
192 switch (ifr->ifr_settings.type) {
194 if (dev_to_hdlc(dev)->proto != &proto)
196 ifr->ifr_settings.type = IF_PROTO_X25;
197 return 0; /* return protocol only, no settable parameters */
200 if (!capable(CAP_NET_ADMIN))
203 if (dev->flags & IFF_UP)
206 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
210 if ((result = attach_hdlc_protocol(dev, &proto, 0)))
212 dev->type = ARPHRD_X25;
213 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
214 netif_dormant_off(dev);
222 static int __init mod_init(void)
224 register_hdlc_protocol(&proto);
230 static void __exit mod_exit(void)
232 unregister_hdlc_protocol(&proto);
236 module_init(mod_init);
237 module_exit(mod_exit);
239 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
240 MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
241 MODULE_LICENSE("GPL v2");