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 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("(%d) %d -= %d\n",
  36                  vcc->vci, sk_wmem_alloc_get(sk), 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 static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb)
  43 {
  44         /*
  45          * Note that if vpi/vci are _ANY or _UNSPEC the below will
  46          * still work
  47          */
  48         if (!capable(CAP_NET_ADMIN) &&
  49             (((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
  50             ((vcc->vpi << ATM_HDR_VPI_SHIFT) |
  51              (vcc->vci << ATM_HDR_VCI_SHIFT))) {
  52                 kfree_skb(skb);
  53                 return -EADDRNOTAVAIL;
  54         }
  55         return vcc->dev->ops->send(vcc, skb);
  56 }
  57
  58 int atm_init_aal0(struct atm_vcc *vcc)
  59 {
  60         vcc->push = atm_push_raw;
  61         vcc->pop = atm_pop_raw;
  62         vcc->push_oam = NULL;
  63         vcc->send = atm_send_aal0;
  64         return 0;
  65 }
  66
  67 int atm_init_aal34(struct atm_vcc *vcc)
  68 {
  69         vcc->push = atm_push_raw;
  70         vcc->pop = atm_pop_raw;
  71         vcc->push_oam = NULL;
  72         vcc->send = vcc->dev->ops->send;
  73         return 0;
  74 }
  75
  76 int atm_init_aal5(struct atm_vcc *vcc)
  77 {
  78         vcc->push = atm_push_raw;
  79         vcc->pop = atm_pop_raw;
  80         vcc->push_oam = NULL;
  81         vcc->send = vcc->dev->ops->send;
  82         return 0;
  83 }
  84 EXPORT_SYMBOL(atm_init_aal5);