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/config.h> 8 #include <linux/module.h> 9 #include <linux/kmod.h> 10 #include <linux/net.h> /* struct socket, struct proto_ops */ 11 #include <linux/atm.h> /* ATM stuff */ 12 #include <linux/atmdev.h> 13 #include <linux/atmclip.h> /* CLIP_*ENCAP */ 14 #include <linux/atmarp.h> /* manifest constants */ 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 <asm/ioctls.h> 21 22 #include "resources.h" 23 #include "signaling.h" /* for WAITING and sigd_attach */ 24 25 26 static DECLARE_MUTEX(ioctl_mutex); 27 static LIST_HEAD(ioctl_list); 28 29 30 void register_atm_ioctl(struct atm_ioctl *ioctl) 31 { 32 down(&ioctl_mutex); 33 list_add_tail(&ioctl->list, &ioctl_list); 34 up(&ioctl_mutex); 35 } 36 37 void deregister_atm_ioctl(struct atm_ioctl *ioctl) 38 { 39 down(&ioctl_mutex); 40 list_del(&ioctl->list); 41 up(&ioctl_mutex); 42 } 43 44 EXPORT_SYMBOL(register_atm_ioctl); 45 EXPORT_SYMBOL(deregister_atm_ioctl); 46 47 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 48 { 49 struct sock *sk = sock->sk; 50 struct atm_vcc *vcc; 51 int error; 52 struct list_head * pos; 53 void __user *argp = (void __user *)arg; 54 55 vcc = ATM_SD(sock); 56 switch (cmd) { 57 case SIOCOUTQ: 58 if (sock->state != SS_CONNECTED || 59 !test_bit(ATM_VF_READY, &vcc->flags)) { 60 error = -EINVAL; 61 goto done; 62 } 63 error = put_user(sk->sk_sndbuf - 64 atomic_read(&sk->sk_wmem_alloc), 65 (int __user *) argp) ? -EFAULT : 0; 66 goto done; 67 case SIOCINQ: 68 { 69 struct sk_buff *skb; 70 71 if (sock->state != SS_CONNECTED) { 72 error = -EINVAL; 73 goto done; 74 } 75 skb = skb_peek(&sk->sk_receive_queue); 76 error = put_user(skb ? skb->len : 0, 77 (int __user *)argp) ? -EFAULT : 0; 78 goto done; 79 } 80 case SIOCGSTAMP: /* borrowed from IP */ 81 error = sock_get_timestamp(sk, argp); 82 goto done; 83 case ATM_SETSC: 84 printk(KERN_WARNING "ATM_SETSC is obsolete\n"); 85 error = 0; 86 goto done; 87 case ATMSIGD_CTRL: 88 if (!capable(CAP_NET_ADMIN)) { 89 error = -EPERM; 90 goto done; 91 } 92 /* 93 * The user/kernel protocol for exchanging signalling 94 * info uses kernel pointers as opaque references, 95 * so the holder of the file descriptor can scribble 96 * on the kernel... so we should make sure that we 97 * have the same privledges that /proc/kcore needs 98 */ 99 if (!capable(CAP_SYS_RAWIO)) { 100 error = -EPERM; 101 goto done; 102 } 103 error = sigd_attach(vcc); 104 if (!error) 105 sock->state = SS_CONNECTED; 106 goto done; 107 default: 108 break; 109 } 110 111 if (cmd == ATMMPC_CTRL || cmd == ATMMPC_DATA) 112 request_module("mpoa"); 113 if (cmd == ATMARPD_CTRL) 114 request_module("clip"); 115 if (cmd == ATMLEC_CTRL) 116 request_module("lec"); 117 118 error = -ENOIOCTLCMD; 119 120 down(&ioctl_mutex); 121 list_for_each(pos, &ioctl_list) { 122 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list); 123 if (try_module_get(ic->owner)) { 124 error = ic->ioctl(sock, cmd, arg); 125 module_put(ic->owner); 126 if (error != -ENOIOCTLCMD) 127 break; 128 } 129 } 130 up(&ioctl_mutex); 131 132 if (error != -ENOIOCTLCMD) 133 goto done; 134 135 error = atm_dev_ioctl(cmd, argp); 136 137 done: 138 return error; 139 } 140