release/src-rt-6.x/linux/linux-2.6/net/atm/ioctl.c

   1 /* ATM ioctl handling */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4 /* 2003 John Levon  <levon@movementarian.org> */
   5
   6
   7 #include <linux/module.h>
   8 #include <linux/kmod.h>
   9 #include <linux/net.h>          /* struct socket, struct proto_ops */
  10 #include <linux/atm.h>          /* ATM stuff */
  11 #include <linux/atmdev.h>
  12 #include <linux/atmclip.h>      /* CLIP_*ENCAP */
  13 #include <linux/atmarp.h>       /* manifest constants */
  14 #include <linux/capability.h>
  15 #include <linux/sonet.h>        /* for ioctls */
  16 #include <linux/atmsvc.h>
  17 #include <linux/atmmpc.h>
  18 #include <net/atmclip.h>
  19 #include <linux/atmlec.h>
  20 #include <linux/mutex.h>
  21 #include <asm/ioctls.h>
  22
  23 #include "resources.h"
  24 #include "signaling.h"          /* for WAITING and sigd_attach */
  25 #include "common.h"
  26
  27
  28 static DEFINE_MUTEX(ioctl_mutex);
  29 static LIST_HEAD(ioctl_list);
  30
  31
  32 void register_atm_ioctl(struct atm_ioctl *ioctl)
  33 {
  34         mutex_lock(&ioctl_mutex);
  35         list_add_tail(&ioctl->list, &ioctl_list);
  36         mutex_unlock(&ioctl_mutex);
  37 }
  38
  39 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
  40 {
  41         mutex_lock(&ioctl_mutex);
  42         list_del(&ioctl->list);
  43         mutex_unlock(&ioctl_mutex);
  44 }
  45
  46 EXPORT_SYMBOL(register_atm_ioctl);
  47 EXPORT_SYMBOL(deregister_atm_ioctl);
  48
  49 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
  50 {
  51         struct sock *sk = sock->sk;
  52         struct atm_vcc *vcc;
  53         int error;
  54         struct list_head * pos;
  55         void __user *argp = (void __user *)arg;
  56
  57         vcc = ATM_SD(sock);
  58         switch (cmd) {
  59                 case SIOCOUTQ:
  60                         if (sock->state != SS_CONNECTED ||
  61                             !test_bit(ATM_VF_READY, &vcc->flags)) {
  62                                 error =  -EINVAL;
  63                                 goto done;
  64                         }
  65                         error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
  66                                          (int __user *) argp) ? -EFAULT : 0;
  67                         goto done;
  68                 case SIOCINQ:
  69                         {
  70                                 struct sk_buff *skb;
  71
  72                                 if (sock->state != SS_CONNECTED) {
  73                                         error = -EINVAL;
  74                                         goto done;
  75                                 }
  76                                 skb = skb_peek(&sk->sk_receive_queue);
  77                                 error = put_user(skb ? skb->len : 0,
  78                                                  (int __user *)argp) ? -EFAULT : 0;
  79                                 goto done;
  80                         }
  81                 case SIOCGSTAMP: /* borrowed from IP */
  82                         error = sock_get_timestamp(sk, argp);
  83                         goto done;
  84                 case SIOCGSTAMPNS: /* borrowed from IP */
  85                         error = sock_get_timestampns(sk, argp);
  86                         goto done;
  87                 case ATM_SETSC:
  88                         printk(KERN_WARNING "ATM_SETSC is obsolete\n");
  89                         error = 0;
  90                         goto done;
  91                 case ATMSIGD_CTRL:
  92                         if (!capable(CAP_NET_ADMIN)) {
  93                                 error = -EPERM;
  94                                 goto done;
  95                         }
  96                         /*
  97                          * The user/kernel protocol for exchanging signalling
  98                          * info uses kernel pointers as opaque references,
  99                          * so the holder of the file descriptor can scribble
 100                          * on the kernel... so we should make sure that we
 101                          * have the same privledges that /proc/kcore needs
 102                          */
 103                         if (!capable(CAP_SYS_RAWIO)) {
 104                                 error = -EPERM;
 105                                 goto done;
 106                         }
 107                         error = sigd_attach(vcc);
 108                         if (!error)
 109                                 sock->state = SS_CONNECTED;
 110                         goto done;
 111                 case ATM_SETBACKEND:
 112                 case ATM_NEWBACKENDIF:
 113                         {
 114                                 atm_backend_t backend;
 115                                 error = get_user(backend, (atm_backend_t __user *) argp);
 116                                 if (error)
 117                                         goto done;
 118                                 switch (backend) {
 119                                         case ATM_BACKEND_PPP:
 120                                                 request_module("pppoatm");
 121                                                 break;
 122                                         case ATM_BACKEND_BR2684:
 123                                                 request_module("br2684");
 124                                                 break;
 125                                 }
 126                         }
 127                         break;
 128                 case ATMMPC_CTRL:
 129                 case ATMMPC_DATA:
 130                         request_module("mpoa");
 131                         break;
 132                 case ATMARPD_CTRL:
 133                         request_module("clip");
 134                         break;
 135                 case ATMLEC_CTRL:
 136                         request_module("lec");
 137                         break;
 138         }
 139
 140         error = -ENOIOCTLCMD;
 141
 142         mutex_lock(&ioctl_mutex);
 143         list_for_each(pos, &ioctl_list) {
 144                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
 145                 if (try_module_get(ic->owner)) {
 146                         error = ic->ioctl(sock, cmd, arg);
 147                         module_put(ic->owner);
 148                         if (error != -ENOIOCTLCMD)
 149                                 break;
 150                 }
 151         }
 152         mutex_unlock(&ioctl_mutex);
 153
 154         if (error != -ENOIOCTLCMD)
 155                 goto done;
 156
 157         error = atm_dev_ioctl(cmd, argp);
 158
 159 done:
 160         return error;
 161 }