text: /* net/atm/raw.c - Raw AAL0 and AAL5 transports */
  
  /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  
  
  #include <linux/module.h>
  #include <linux/atmdev.h>
  #include <linux/capability.h>
  #include <linux/kernel.h>
  #include <linux/skbuff.h>
  #include <linux/mm.h>
  
  #include "common.h"
  #include "protocols.h"
  
  /*
   * SKB == NULL indicates that the link is being closed
   */
  
  static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  {
  	if (skb) {
  		struct sock *sk = sk_atm(vcc);
  
  		skb_queue_tail(&sk->sk_receive_queue, skb);
  		sk->sk_data_ready(sk, skb->len);
  	}
  }
  
  
  static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  {
  	struct sock *sk = sk_atm(vcc);
  
  	pr_debug("APopR (%d) %d -= %d\n", vcc->vci,
  		sk_wmem_alloc_get(sk), skb->truesize);
  	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
  	dev_kfree_skb_any(skb);
  	sk->sk_write_space(sk);
  }
  
  
  static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  {
  	/*
  	 * Note that if vpi/vci are _ANY or _UNSPEC the below will
  	 * still work
  	 */
  	if (!capable(CAP_NET_ADMIN) &&
  	    (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  	    ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  	    {
  		kfree_skb(skb);
  		return -EADDRNOTAVAIL;
  	}
  	return vcc->dev->ops->send(vcc,skb);
  }
  
  
  int atm_init_aal0(struct atm_vcc *vcc)
  {
  	vcc->push = atm_push_raw;
  	vcc->pop = atm_pop_raw;
  	vcc->push_oam = NULL;
  	vcc->send = atm_send_aal0;
  	return 0;
  }
  
  
  int atm_init_aal34(struct atm_vcc *vcc)
  {
  	vcc->push = atm_push_raw;
  	vcc->pop = atm_pop_raw;
  	vcc->push_oam = NULL;
  	vcc->send = vcc->dev->ops->send;
  	return 0;
  }
  
  
  int atm_init_aal5(struct atm_vcc *vcc)
  {
  	vcc->push = atm_push_raw;
  	vcc->pop = atm_pop_raw;
  	vcc->push_oam = NULL;
  	vcc->send = vcc->dev->ops->send;
  	return 0;
  }
  
  
  EXPORT_SYMBOL(atm_init_aal5);
  