/*
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/*
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* X.25 Packet Layer release 002
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* X.25 Packet Layer release 002
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*
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*
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* This is ALPHA test software. This code may break your machine, randomly fail to work with new
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* This is ALPHA test software. This code may break your machine, randomly fail to work with new
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* releases, misbehave and/or generally screw up. It might even work.
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* releases, misbehave and/or generally screw up. It might even work.
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*
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*
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* This code REQUIRES 2.1.15 or higher
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* This code REQUIRES 2.1.15 or higher
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*
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*
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* This module:
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* This module:
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* This module is free software; you can redistribute it and/or
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* 2 of the License, or (at your option) any later version.
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*
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*
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* History
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* History
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* X.25 001 Jonathan Naylor Started coding.
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* X.25 001 Jonathan Naylor Started coding.
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* 2000-09-04 Henner Eisen Prevent freeing a dangling skb.
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* 2000-09-04 Henner Eisen Prevent freeing a dangling skb.
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*/
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*/
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#include <linux/config.h>
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/net.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <linux/inet.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */
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#include <linux/termios.h> /* For TIOCINQ/OUTQ */
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/notifier.h>
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#include <linux/proc_fs.h>
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#include <linux/proc_fs.h>
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#include <linux/if_arp.h>
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#include <linux/if_arp.h>
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#include <net/x25.h>
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#include <net/x25.h>
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static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *neigh)
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static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *neigh)
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{
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{
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struct sock *sk;
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struct sock *sk;
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unsigned short frametype;
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unsigned short frametype;
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unsigned int lci;
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unsigned int lci;
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frametype = skb->data[2];
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frametype = skb->data[2];
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lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
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lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
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/*
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/*
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* LCI of zero is always for us, and its always a link control
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* LCI of zero is always for us, and its always a link control
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* frame.
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* frame.
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*/
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*/
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if (lci == 0) {
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if (lci == 0) {
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x25_link_control(skb, neigh, frametype);
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x25_link_control(skb, neigh, frametype);
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return 0;
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return 0;
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}
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}
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/*
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/*
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* Find an existing socket.
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* Find an existing socket.
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*/
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*/
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if ((sk = x25_find_socket(lci, neigh)) != NULL) {
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if ((sk = x25_find_socket(lci, neigh)) != NULL) {
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int queued = 1;
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int queued = 1;
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skb->h.raw = skb->data;
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skb->h.raw = skb->data;
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bh_lock_sock(sk);
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bh_lock_sock(sk);
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if (!sk->lock.users) {
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if (!sk->lock.users) {
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queued = x25_process_rx_frame(sk, skb);
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queued = x25_process_rx_frame(sk, skb);
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} else {
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} else {
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sk_add_backlog(sk, skb);
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sk_add_backlog(sk, skb);
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}
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}
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bh_unlock_sock(sk);
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bh_unlock_sock(sk);
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return queued;
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return queued;
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}
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}
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/*
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/*
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* Is is a Call Request ? if so process it.
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* Is is a Call Request ? if so process it.
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*/
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*/
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if (frametype == X25_CALL_REQUEST)
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if (frametype == X25_CALL_REQUEST)
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return x25_rx_call_request(skb, neigh, lci);
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return x25_rx_call_request(skb, neigh, lci);
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/*
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/*
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* Its not a Call Request, nor is it a control frame.
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* Its not a Call Request, nor is it a control frame.
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* Let caller throw it away.
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* Let caller throw it away.
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*/
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*/
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/*
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/*
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x25_transmit_clear_request(neigh, lci, 0x0D);
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x25_transmit_clear_request(neigh, lci, 0x0D);
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*/
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*/
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printk(KERN_DEBUG "x25_receive_data(): unknown frame type %2x\n",frametype);
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printk(KERN_DEBUG "x25_receive_data(): unknown frame type %2x\n",frametype);
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return 0;
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return 0;
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}
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}
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int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
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int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
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{
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{
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struct x25_neigh *neigh;
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struct x25_neigh *neigh;
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int queued;
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int queued;
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skb->sk = NULL;
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skb->sk = NULL;
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/*
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/*
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* Packet received from unrecognised device, throw it away.
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* Packet received from unrecognised device, throw it away.
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*/
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*/
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if ((neigh = x25_get_neigh(dev)) == NULL) {
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if ((neigh = x25_get_neigh(dev)) == NULL) {
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printk(KERN_DEBUG "X.25: unknown neighbour - %s\n", dev->name);
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printk(KERN_DEBUG "X.25: unknown neighbour - %s\n", dev->name);
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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}
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}
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switch (skb->data[0]) {
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switch (skb->data[0]) {
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case 0x00:
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case 0x00:
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skb_pull(skb, 1);
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skb_pull(skb, 1);
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queued = x25_receive_data(skb, neigh);
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queued = x25_receive_data(skb, neigh);
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if( ! queued )
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if( ! queued )
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/* We need to free the skb ourselves because
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/* We need to free the skb ourselves because
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* net_bh() won't care about our return code.
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* net_bh() won't care about our return code.
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*/
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*/
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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case 0x01:
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case 0x01:
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x25_link_established(neigh);
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x25_link_established(neigh);
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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case 0x02:
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case 0x02:
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x25_link_terminated(neigh);
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x25_link_terminated(neigh);
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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case 0x03:
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case 0x03:
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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default:
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default:
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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}
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}
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}
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}
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int x25_llc_receive_frame(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
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int x25_llc_receive_frame(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
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{
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{
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struct x25_neigh *neigh;
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struct x25_neigh *neigh;
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skb->sk = NULL;
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skb->sk = NULL;
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/*
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/*
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* Packet received from unrecognised device, throw it away.
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* Packet received from unrecognised device, throw it away.
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*/
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*/
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if ((neigh = x25_get_neigh(dev)) == NULL) {
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if ((neigh = x25_get_neigh(dev)) == NULL) {
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printk(KERN_DEBUG "X.25: unknown_neighbour - %s\n", dev->name);
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printk(KERN_DEBUG "X.25: unknown_neighbour - %s\n", dev->name);
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kfree_skb(skb);
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kfree_skb(skb);
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return 0;
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return 0;
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}
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}
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return x25_receive_data(skb, neigh);
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return x25_receive_data(skb, neigh);
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}
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}
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void x25_establish_link(struct x25_neigh *neigh)
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void x25_establish_link(struct x25_neigh *neigh)
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{
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{
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struct sk_buff *skb;
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struct sk_buff *skb;
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unsigned char *ptr;
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unsigned char *ptr;
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switch (neigh->dev->type) {
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switch (neigh->dev->type) {
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case ARPHRD_X25:
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case ARPHRD_X25:
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if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) {
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if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) {
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printk(KERN_ERR "x25_dev: out of memory\n");
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printk(KERN_ERR "x25_dev: out of memory\n");
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return;
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return;
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}
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}
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ptr = skb_put(skb, 1);
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ptr = skb_put(skb, 1);
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*ptr = 0x01;
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*ptr = 0x01;
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break;
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break;
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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case ARPHRD_ETHER:
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case ARPHRD_ETHER:
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return;
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return;
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#endif
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#endif
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default:
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default:
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return;
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return;
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}
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}
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skb->protocol = htons(ETH_P_X25);
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skb->protocol = htons(ETH_P_X25);
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skb->dev = neigh->dev;
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skb->dev = neigh->dev;
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dev_queue_xmit(skb);
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dev_queue_xmit(skb);
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}
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}
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void x25_terminate_link(struct x25_neigh *neigh)
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void x25_terminate_link(struct x25_neigh *neigh)
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{
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{
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struct sk_buff *skb;
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struct sk_buff *skb;
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unsigned char *ptr;
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unsigned char *ptr;
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switch (neigh->dev->type) {
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switch (neigh->dev->type) {
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case ARPHRD_X25:
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case ARPHRD_X25:
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if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) {
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if ((skb = alloc_skb(1, GFP_ATOMIC)) == NULL) {
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printk(KERN_ERR "x25_dev: out of memory\n");
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printk(KERN_ERR "x25_dev: out of memory\n");
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return;
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return;
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}
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}
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ptr = skb_put(skb, 1);
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ptr = skb_put(skb, 1);
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*ptr = 0x02;
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*ptr = 0x02;
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break;
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break;
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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case ARPHRD_ETHER:
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case ARPHRD_ETHER:
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return;
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return;
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#endif
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#endif
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default:
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default:
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return;
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return;
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}
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}
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skb->protocol = htons(ETH_P_X25);
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skb->protocol = htons(ETH_P_X25);
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skb->dev = neigh->dev;
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skb->dev = neigh->dev;
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dev_queue_xmit(skb);
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dev_queue_xmit(skb);
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}
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}
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void x25_send_frame(struct sk_buff *skb, struct x25_neigh *neigh)
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void x25_send_frame(struct sk_buff *skb, struct x25_neigh *neigh)
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{
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{
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unsigned char *dptr;
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unsigned char *dptr;
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skb->nh.raw = skb->data;
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skb->nh.raw = skb->data;
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switch (neigh->dev->type) {
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switch (neigh->dev->type) {
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case ARPHRD_X25:
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case ARPHRD_X25:
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dptr = skb_push(skb, 1);
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dptr = skb_push(skb, 1);
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*dptr = 0x00;
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*dptr = 0x00;
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break;
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break;
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
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case ARPHRD_ETHER:
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case ARPHRD_ETHER:
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kfree_skb(skb);
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kfree_skb(skb);
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return;
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return;
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#endif
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#endif
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default:
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default:
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kfree_skb(skb);
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kfree_skb(skb);
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return;
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return;
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}
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}
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skb->protocol = htons(ETH_P_X25);
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skb->protocol = htons(ETH_P_X25);
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skb->dev = neigh->dev;
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skb->dev = neigh->dev;
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dev_queue_xmit(skb);
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dev_queue_xmit(skb);
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}
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}
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