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 #include <net/compat.h>
  23
  24 #include "resources.h"
  25 #include "signaling.h"          /* for WAITING and sigd_attach */
  26 #include "common.h"
  27
  28
  29 static DEFINE_MUTEX(ioctl_mutex);
  30 static LIST_HEAD(ioctl_list);
  31
  32
  33 void register_atm_ioctl(struct atm_ioctl *ioctl)
  34 {
  35         mutex_lock(&ioctl_mutex);
  36         list_add_tail(&ioctl->list, &ioctl_list);
  37         mutex_unlock(&ioctl_mutex);
  38 }
  39
  40 void deregister_atm_ioctl(struct atm_ioctl *ioctl)
  41 {
  42         mutex_lock(&ioctl_mutex);
  43         list_del(&ioctl->list);
  44         mutex_unlock(&ioctl_mutex);
  45 }
  46
  47 EXPORT_SYMBOL(register_atm_ioctl);
  48 EXPORT_SYMBOL(deregister_atm_ioctl);
  49
  50 static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg, int compat)
  51 {
  52         struct sock *sk = sock->sk;
  53         struct atm_vcc *vcc;
  54         int error;
  55         struct list_head * pos;
  56         void __user *argp = (void __user *)arg;
  57
  58         vcc = ATM_SD(sock);
  59         switch (cmd) {
  60                 case SIOCOUTQ:
  61                         if (sock->state != SS_CONNECTED ||
  62                             !test_bit(ATM_VF_READY, &vcc->flags)) {
  63                                 error =  -EINVAL;
  64                                 goto done;
  65                         }
  66                         error = put_user(sk->sk_sndbuf -
  67                                          atomic_read(&sk->sk_wmem_alloc),
  68                                          (int __user *) argp) ? -EFAULT : 0;
  69                         goto done;
  70                 case SIOCINQ:
  71                         {
  72                                 struct sk_buff *skb;
  73
  74                                 if (sock->state != SS_CONNECTED) {
  75                                         error = -EINVAL;
  76                                         goto done;
  77                                 }
  78                                 skb = skb_peek(&sk->sk_receive_queue);
  79                                 error = put_user(skb ? skb->len : 0,
  80                                                  (int __user *)argp) ? -EFAULT : 0;
  81                                 goto done;
  82                         }
  83                 case SIOCGSTAMP: /* borrowed from IP */
  84 #ifdef CONFIG_COMPAT
  85                         if (compat)
  86                                 error = compat_sock_get_timestamp(sk, argp);
  87                         else
  88 #endif
  89                                 error = sock_get_timestamp(sk, argp);
  90                         goto done;
  91                 case SIOCGSTAMPNS: /* borrowed from IP */
  92 #ifdef CONFIG_COMPAT
  93                         if (compat)
  94                                 error = compat_sock_get_timestampns(sk, argp);
  95                         else
  96 #endif
  97                                 error = sock_get_timestampns(sk, argp);
  98                         goto done;
  99                 case ATM_SETSC:
 100                         if (net_ratelimit())
 101                                 printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
 102                                        current->comm, task_pid_nr(current));
 103                         error = 0;
 104                         goto done;
 105                 case ATMSIGD_CTRL:
 106                         if (!capable(CAP_NET_ADMIN)) {
 107                                 error = -EPERM;
 108                                 goto done;
 109                         }
 110                         /*
 111                          * The user/kernel protocol for exchanging signalling
 112                          * info uses kernel pointers as opaque references,
 113                          * so the holder of the file descriptor can scribble
 114                          * on the kernel... so we should make sure that we
 115                          * have the same privileges that /proc/kcore needs
 116                          */
 117                         if (!capable(CAP_SYS_RAWIO)) {
 118                                 error = -EPERM;
 119                                 goto done;
 120                         }
 121 #ifdef CONFIG_COMPAT
 122                         /* WTF? I don't even want to _think_ about making this
 123                            work for 32-bit userspace. TBH I don't really want
 124                            to think about it at all. dwmw2. */
 125                         if (compat) {
 126                                 if (net_ratelimit())
 127                                         printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
 128                                 error = -EINVAL;
 129                                 goto done;
 130                         }
 131 #endif
 132                         error = sigd_attach(vcc);
 133                         if (!error)
 134                                 sock->state = SS_CONNECTED;
 135                         goto done;
 136                 case ATM_SETBACKEND:
 137                 case ATM_NEWBACKENDIF:
 138                         {
 139                                 atm_backend_t backend;
 140                                 error = get_user(backend, (atm_backend_t __user *) argp);
 141                                 if (error)
 142                                         goto done;
 143                                 switch (backend) {
 144                                         case ATM_BACKEND_PPP:
 145                                                 request_module("pppoatm");
 146                                                 break;
 147                                         case ATM_BACKEND_BR2684:
 148                                                 request_module("br2684");
 149                                                 break;
 150                                 }
 151                         }
 152                         break;
 153                 case ATMMPC_CTRL:
 154                 case ATMMPC_DATA:
 155                         request_module("mpoa");
 156                         break;
 157                 case ATMARPD_CTRL:
 158                         request_module("clip");
 159                         break;
 160                 case ATMLEC_CTRL:
 161                         request_module("lec");
 162                         break;
 163         }
 164
 165         error = -ENOIOCTLCMD;
 166
 167         mutex_lock(&ioctl_mutex);
 168         list_for_each(pos, &ioctl_list) {
 169                 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list);
 170                 if (try_module_get(ic->owner)) {
 171                         error = ic->ioctl(sock, cmd, arg);
 172                         module_put(ic->owner);
 173                         if (error != -ENOIOCTLCMD)
 174                                 break;
 175                 }
 176         }
 177         mutex_unlock(&ioctl_mutex);
 178
 179         if (error != -ENOIOCTLCMD)
 180                 goto done;
 181
 182         error = atm_dev_ioctl(cmd, argp, compat);
 183
 184 done:
 185         return error;
 186 }
 187
 188
 189 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 190 {
 191         return do_vcc_ioctl(sock, cmd, arg, 0);
 192 }
 193
 194 #ifdef CONFIG_COMPAT
 195 int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 196 {
 197         return do_vcc_ioctl(sock, cmd, arg, 1);
 198 }
 199 #endif