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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   6
   7 #include <linux/module.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  * SKB == NULL indicates that the link is being closed
  19  */
  20
  21 static void atm_push_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  22 {
  23         if (skb) {
  24                 struct sock *sk = sk_atm(vcc);
  25
  26                 skb_queue_tail(&sk->sk_receive_queue, skb);
  27                 sk->sk_data_ready(sk, skb->len);
  28         }
  29 }
  30
  31
  32 static void atm_pop_raw(struct atm_vcc *vcc,struct sk_buff *skb)
  33 {
  34         struct sock *sk = sk_atm(vcc);
  35
  36         pr_debug("(%d) %d -= %d\n",
  37                  vcc->vci, sk_wmem_alloc_get(sk), skb->truesize);
  38         atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
  39         dev_kfree_skb_any(skb);
  40         sk->sk_write_space(sk);
  41 }
  42
  43
  44 static int atm_send_aal0(struct atm_vcc *vcc,struct sk_buff *skb)
  45 {
  46         /*
  47          * Note that if vpi/vci are _ANY or _UNSPEC the below will
  48          * still work
  49          */
  50         if (!capable(CAP_NET_ADMIN) &&
  51             (((u32 *) skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  52             ((vcc->vpi << ATM_HDR_VPI_SHIFT) | (vcc->vci << ATM_HDR_VCI_SHIFT)))
  53             {
  54                 kfree_skb(skb);
  55                 return -EADDRNOTAVAIL;
  56         }
  57         return vcc->dev->ops->send(vcc,skb);
  58 }
  59
  60
  61 int atm_init_aal0(struct atm_vcc *vcc)
  62 {
  63         vcc->push = atm_push_raw;
  64         vcc->pop = atm_pop_raw;
  65         vcc->push_oam = NULL;
  66         vcc->send = atm_send_aal0;
  67         return 0;
  68 }
  69
  70
  71 int atm_init_aal34(struct atm_vcc *vcc)
  72 {
  73         vcc->push = atm_push_raw;
  74         vcc->pop = atm_pop_raw;
  75         vcc->push_oam = NULL;
  76         vcc->send = vcc->dev->ops->send;
  77         return 0;
  78 }
  79
  80
  81 int atm_init_aal5(struct atm_vcc *vcc)
  82 {
  83         vcc->push = atm_push_raw;
  84         vcc->pop = atm_pop_raw;
  85         vcc->push_oam = NULL;
  86         vcc->send = vcc->dev->ops->send;
  87         return 0;
  88 }
  89
  90
  91 EXPORT_SYMBOL(atm_init_aal5);