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/capability.h>
  10 #include <linux/kernel.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/mm.h>
  13
  14 #include "common.h"
  15 #include "protocols.h"
  16
  17
  18 #if 0
  19 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  20 #else
  21 #define DPRINTK(format,args...)
  22 #endif
  23
  24
  25 /*
  26  * SKB == NULL indicates that the link is being closed
  27  */
  28
  29 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  30 {
  31         if (skb) {
  32                 struct sock *sk = sk_atm(vcc);
  33
  34                 skb_queue_tail(&sk->sk_receive_queue, skb);
  35                 sk->sk_data_ready(sk, skb->len);
  36         }
  37 }
  38
  39
  40 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  41 {
  42         struct sock *sk = sk_atm(vcc);
  43
  44         DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, sk->sk_wmem_alloc,
  45                 skb->truesize);
  46         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
  47         dev_kfree_skb_any(skb);
  48         sk->sk_write_space(sk);
  49 }
  50
  51
  52 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  53 {
  54         /*
  55          * Note that if vpi/vci are _ANY or _UNSPEC the below will
  56          * still work
  57          */
  58         if (!capable(CAP_NET_ADMIN) &&
  59             (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  60             ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  61             {
  62                 kfree_skb(skb);
  63                 return -EADDRNOTAVAIL;
  64         }
  65         return vcc->dev->ops->send(vcc,skb);
  66 }
  67
  68
  69 int atm_init_aal0(struct atm_vcc *vcc)
  70 {
  71         vcc->push = atm_push_raw;
  72         vcc->pop = atm_pop_raw;
  73         vcc->push_oam = NULL;
  74         vcc->send = atm_send_aal0;
  75         return 0;
  76 }
  77
  78
  79 int atm_init_aal34(struct atm_vcc *vcc)
  80 {
  81         vcc->push = atm_push_raw;
  82         vcc->pop = atm_pop_raw;
  83         vcc->push_oam = NULL;
  84         vcc->send = vcc->dev->ops->send;
  85         return 0;
  86 }
  87
  88
  89 int atm_init_aal5(struct atm_vcc *vcc)
  90 {
  91         vcc->push = atm_push_raw;
  92         vcc->pop = atm_pop_raw;
  93         vcc->push_oam = NULL;
  94         vcc->send = vcc->dev->ops->send;
  95         return 0;
  96 }
  97
  98
  99 EXPORT_SYMBOL(atm_init_aal5);