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 100                                 printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",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