![Stephen Hemminger](/assets/img/avatar_default.png)
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
246 lines
4.8 KiB
C
246 lines
4.8 KiB
C
/*
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* Generic HDLC support routines for Linux
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* X.25 support
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*
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* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#include <linux/errno.h>
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#include <linux/hdlc.h>
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#include <linux/if_arp.h>
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#include <linux/inetdevice.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/lapb.h>
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#include <linux/module.h>
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#include <linux/pkt_sched.h>
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#include <linux/poll.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <net/x25device.h>
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static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
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/* These functions are callbacks called by LAPB layer */
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static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
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{
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struct sk_buff *skb;
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unsigned char *ptr;
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if ((skb = dev_alloc_skb(1)) == NULL) {
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printk(KERN_ERR "%s: out of memory\n", dev->name);
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return;
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}
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ptr = skb_put(skb, 1);
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*ptr = code;
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skb->protocol = x25_type_trans(skb, dev);
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netif_rx(skb);
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}
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static void x25_connected(struct net_device *dev, int reason)
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{
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x25_connect_disconnect(dev, reason, 1);
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}
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static void x25_disconnected(struct net_device *dev, int reason)
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{
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x25_connect_disconnect(dev, reason, 2);
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}
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static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
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{
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unsigned char *ptr;
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skb_push(skb, 1);
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if (skb_cow(skb, 1))
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return NET_RX_DROP;
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ptr = skb->data;
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*ptr = 0;
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skb->protocol = x25_type_trans(skb, dev);
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return netif_rx(skb);
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}
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static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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hdlc->xmit(skb, dev); /* Ignore return value :-( */
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}
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static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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int result;
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/* X.25 to LAPB */
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switch (skb->data[0]) {
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case 0: /* Data to be transmitted */
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skb_pull(skb, 1);
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if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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case 1:
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if ((result = lapb_connect_request(dev))!= LAPB_OK) {
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if (result == LAPB_CONNECTED)
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/* Send connect confirm. msg to level 3 */
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x25_connected(dev, 0);
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else
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printk(KERN_ERR "%s: LAPB connect request "
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"failed, error code = %i\n",
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dev->name, result);
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}
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break;
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case 2:
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if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
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if (result == LAPB_NOTCONNECTED)
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/* Send disconnect confirm. msg to level 3 */
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x25_disconnected(dev, 0);
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else
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printk(KERN_ERR "%s: LAPB disconnect request "
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"failed, error code = %i\n",
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dev->name, result);
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}
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break;
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default: /* to be defined */
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break;
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}
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static int x25_open(struct net_device *dev)
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{
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struct lapb_register_struct cb;
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int result;
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cb.connect_confirmation = x25_connected;
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cb.connect_indication = x25_connected;
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cb.disconnect_confirmation = x25_disconnected;
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cb.disconnect_indication = x25_disconnected;
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cb.data_indication = x25_data_indication;
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cb.data_transmit = x25_data_transmit;
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result = lapb_register(dev, &cb);
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if (result != LAPB_OK)
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return result;
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return 0;
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}
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static void x25_close(struct net_device *dev)
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{
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lapb_unregister(dev);
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}
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static int x25_rx(struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
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dev->stats.rx_dropped++;
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return NET_RX_DROP;
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}
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if (lapb_data_received(dev, skb) == LAPB_OK)
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return NET_RX_SUCCESS;
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dev->stats.rx_errors++;
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dev_kfree_skb_any(skb);
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return NET_RX_DROP;
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}
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static struct hdlc_proto proto = {
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.open = x25_open,
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.close = x25_close,
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.ioctl = x25_ioctl,
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.netif_rx = x25_rx,
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.xmit = x25_xmit,
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.module = THIS_MODULE,
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};
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static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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int result;
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switch (ifr->ifr_settings.type) {
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case IF_GET_PROTO:
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if (dev_to_hdlc(dev)->proto != &proto)
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return -EINVAL;
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ifr->ifr_settings.type = IF_PROTO_X25;
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return 0; /* return protocol only, no settable parameters */
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case IF_PROTO_X25:
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if(!capable(CAP_NET_ADMIN))
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return -EPERM;
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if(dev->flags & IFF_UP)
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return -EBUSY;
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result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
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if (result)
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return result;
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if ((result = attach_hdlc_protocol(dev, &proto, 0)))
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return result;
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dev->type = ARPHRD_X25;
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netif_dormant_off(dev);
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return 0;
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}
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return -EINVAL;
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}
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static int __init mod_init(void)
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{
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register_hdlc_protocol(&proto);
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return 0;
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}
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static void __exit mod_exit(void)
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{
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unregister_hdlc_protocol(&proto);
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}
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module_init(mod_init);
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module_exit(mod_exit);
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MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
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MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
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MODULE_LICENSE("GPL v2");
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