LXR linux-old/net/atm/raw.c

   1/* net/atm/raw.c - Raw AAL0 and AAL5 transports */
   2
   3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6#include <linux/module.h>
   7#include <linux/sched.h>
   8#include <linux/atmdev.h>
   9#include <linux/kernel.h>
  10#include <linux/skbuff.h>
  11#include <linux/mm.h>
  12
  13#include "common.h"
  14#include "protocols.h"
  15
  16
  17#if 0
  18#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  19#else
  20#define DPRINTK(format,args...)
  21#endif
  22
  23
  24/*
  25 * SKB == NULL indicates that the link is being closed
  26 */
  27
  28void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  29{
  30        if (skb) {
  31                skb_queue_tail(&vcc->sk->receive_queue,skb);
  32                wake_up(&vcc->sleep);
  33        }
  34}
  35
  36
  37static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  38{
  39        DPRINTK("APopR (%d) %d -= %d\n",vcc->vci,vcc->sk->wmem_alloc,skb->truesize);
  40        atomic_sub(skb->truesize, &vcc->sk->wmem_alloc);
  41        dev_kfree_skb_any(skb);
  42        wake_up(&vcc->sleep);
  43}
  44
  45
  46static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  47{
  48        /*
  49         * Note that if vpi/vci are _ANY or _UNSPEC the below will
  50         * still work
  51         */
  52        if (!capable(CAP_NET_ADMIN) &&
  53            (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  54            ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  55            {
  56                kfree_skb(skb);
  57                return -EADDRNOTAVAIL;
  58        }
  59        return vcc->dev->ops->send(vcc,skb);
  60}
  61
  62
  63int atm_init_aal0(struct atm_vcc *vcc)
  64{
  65        vcc->push = atm_push_raw;
  66        vcc->pop = atm_pop_raw;
  67        vcc->push_oam = NULL;
  68        vcc->send = atm_send_aal0;
  69        return 0;
  70}
  71
  72
  73int atm_init_aal34(struct atm_vcc *vcc)
  74{
  75        vcc->push = atm_push_raw;
  76        vcc->pop = atm_pop_raw;
  77        vcc->push_oam = NULL;
  78        vcc->send = vcc->dev->ops->send;
  79        return 0;
  80}
  81
  82
  83int atm_init_aal5(struct atm_vcc *vcc)
  84{
  85        vcc->push = atm_push_raw;
  86        vcc->pop = atm_pop_raw;
  87        vcc->push_oam = NULL;
  88        vcc->send = vcc->dev->ops->send;
  89        return 0;
  90}
  91
  92
  93EXPORT_SYMBOL(atm_init_aal5);
  94