Eric Lee / smarc-fsl-linux-kernel

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net/rose/rose_loopback.c 2.73 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   */
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <linux/socket.h>
  #include <linux/timer.h>
  #include <net/ax25.h>
  #include <linux/skbuff.h>
  #include <net/rose.h>
  #include <linux/init.h>
  
  static struct sk_buff_head loopback_queue;
  static struct timer_list loopback_timer;
  
  static void rose_set_loopback_timer(void);
  
  void rose_loopback_init(void)
  {
  	skb_queue_head_init(&loopback_queue);
  
  	init_timer(&loopback_timer);
  }
  
  static int rose_loopback_running(void)
  {
  	return timer_pending(&loopback_timer);
  }
  
  int rose_loopback_queue(struct sk_buff *skb, struct rose_neigh *neigh)
  {
  	struct sk_buff *skbn;
  
  	skbn = skb_clone(skb, GFP_ATOMIC);
  
  	kfree_skb(skb);
  
  	if (skbn != NULL) {
  		skb_queue_tail(&loopback_queue, skbn);
  
  		if (!rose_loopback_running())
  			rose_set_loopback_timer();
  	}
  
  	return 1;
  }
  
  static void rose_loopback_timer(unsigned long);
  
  static void rose_set_loopback_timer(void)
  {
  	del_timer(&loopback_timer);
  
  	loopback_timer.data     = 0;
  	loopback_timer.function = &rose_loopback_timer;
  	loopback_timer.expires  = jiffies + 10;
  
  	add_timer(&loopback_timer);
  }
  
  static void rose_loopback_timer(unsigned long param)
  {
  	struct sk_buff *skb;
  	struct net_device *dev;
  	rose_address *dest;
  	struct sock *sk;
  	unsigned short frametype;
  	unsigned int lci_i, lci_o;
  
  	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  		if (skb->len < ROSE_MIN_LEN) {
  			kfree_skb(skb);
  			continue;
  		}
  		lci_i     = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
  		frametype = skb->data[2];
  		if (frametype == ROSE_CALL_REQUEST &&
  		    (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
  		     skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
  		     ROSE_CALL_REQ_ADDR_LEN_VAL)) {
  			kfree_skb(skb);
  			continue;
  		}
  		dest      = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
  		lci_o     = ROSE_DEFAULT_MAXVC + 1 - lci_i;
  
  		skb_reset_transport_header(skb);
  
  		sk = rose_find_socket(lci_o, rose_loopback_neigh);
  		if (sk) {
  			if (rose_process_rx_frame(sk, skb) == 0)
  				kfree_skb(skb);
  			continue;
  		}
  
  		if (frametype == ROSE_CALL_REQUEST) {
  			if ((dev = rose_dev_get(dest)) != NULL) {
  				if (rose_rx_call_request(skb, dev, rose_loopback_neigh, lci_o) == 0)
  					kfree_skb(skb);
  			} else {
  				kfree_skb(skb);
  			}
  		} else {
  			kfree_skb(skb);
  		}
  	}
  }
  
  void __exit rose_loopback_clear(void)
  {
  	struct sk_buff *skb;
  
  	del_timer(&loopback_timer);
  
  	while ((skb = skb_dequeue(&loopback_queue)) != NULL) {
  		skb->sk = NULL;
  		kfree_skb(skb);
  	}
  }