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