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
  28 void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  29 {
  30         if (skb) {
  31                 skb_queue_tail(&vcc->sk->sk_receive_queue, skb);
  32                 vcc->sk->sk_data_ready(vcc->sk, skb->len);
  33         }
  34 }
  35
  36
  37 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  38 {
  39         DPRINTK("APopR (%d) %d -= %d\n", vcc->vci, vcc->sk->sk_wmem_alloc,
  40                 skb->truesize);
  41         atomic_sub(skb->truesize, &vcc->sk->sk_wmem_alloc);
  42         dev_kfree_skb_any(skb);
  43         vcc->sk->sk_write_space(vcc->sk);
  44 }
  45
  46
  47 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  48 {
  49         /*
  50          * Note that if vpi/vci are _ANY or _UNSPEC the below will
  51          * still work
  52          */
  53         if (!capable(CAP_NET_ADMIN) &&
  54             (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  55             ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  56             {
  57                 kfree_skb(skb);
  58                 return -EADDRNOTAVAIL;
  59         }
  60         return vcc->dev->ops->send(vcc,skb);
  61 }
  62
  63
  64 int atm_init_aal0(struct atm_vcc *vcc)
  65 {
  66         vcc->push = atm_push_raw;
  67         vcc->pop = atm_pop_raw;
  68         vcc->push_oam = NULL;
  69         vcc->send = atm_send_aal0;
  70         return 0;
  71 }
  72
  73
  74 int atm_init_aal34(struct atm_vcc *vcc)
  75 {
  76         vcc->push = atm_push_raw;
  77         vcc->pop = atm_pop_raw;
  78         vcc->push_oam = NULL;
  79         vcc->send = vcc->dev->ops->send;
  80         return 0;
  81 }
  82
  83
  84 int atm_init_aal5(struct atm_vcc *vcc)
  85 {
  86         vcc->push = atm_push_raw;
  87         vcc->pop = atm_pop_raw;
  88         vcc->push_oam = NULL;
  89         vcc->send = vcc->dev->ops->send;
  90         return 0;
  91 }
  92
  93
  94 EXPORT_SYMBOL(atm_init_aal5);