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/capability.h> 16 #include <linux/sonet.h> /* for ioctls */ 17 #include <linux/atmsvc.h> 18 #include <linux/atmmpc.h> 19 #include <net/atmclip.h> 20 #include <linux/atmlec.h> 21 #include <linux/mutex.h> 22 #include <asm/ioctls.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 int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 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from IP */ 84 error = sock_get_timestamp(sk, argp); 85 goto done; 86 case ATM_SETSC: 87 printk(KERN_WARNING "ATM_SETSC is obsolete\n"); 88 error = 0; 89 goto done; 90 case ATMSIGD_CTRL: 91 if (!capable(CAP_NET_ADMIN)) { 92 error = -EPERM; 93 goto done; 94 } 95 /* 96 * The user/kernel protocol for exchanging signalling 97 * info uses kernel pointers as opaque references, 98 * so the holder of the file descriptor can scribble 99 * on the kernel... so we should make sure that we 100 * have the same privledges that /proc/kcore needs 101 */ 102 if (!capable(CAP_SYS_RAWIO)) { 103 error = -EPERM; 104 goto done; 105 } 106 error = sigd_attach(vcc); 107 if (!error) 108 sock->state = SS_CONNECTED; 109 goto done; 110 case ATM_SETBACKEND: 111 case ATM_NEWBACKENDIF: 112 { 113 atm_backend_t backend; 114 error = get_user(backend, (atm_backend_t __user *) argp); 115 if (error) 116 goto done; 117 switch (backend) { 118 case ATM_BACKEND_PPP: 119 request_module("pppoatm"); 120 break; 121 case ATM_BACKEND_BR2684: 122 request_module("br2684"); 123 break; 124 } 125 } 126 break; 127 case ATMMPC_CTRL: 128 case ATMMPC_DATA: 129 request_module("mpoa"); 130 break; 131 case ATMARPD_CTRL: 132 request_module("clip"); 133 break; 134 case ATMLEC_CTRL: 135 request_module("lec"); 136 break; 137 } 138 139 error = -ENOIOCTLCMD; 140 141 mutex_lock(&ioctl_mutex); 142 list_for_each(pos, &ioctl_list) { 143 struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list); 144 if (try_module_get(ic->owner)) { 145 error = ic->ioctl(sock, cmd, arg); 146 module_put(ic->owner); 147 if (error != -ENOIOCTLCMD) 148 break; 149 } 150 } 151 mutex_unlock(&ioctl_mutex); 152 153 if (error != -ENOIOCTLCMD) 154 goto done; 155 156 error = atm_dev_ioctl(cmd, argp); 157 158 done: 159 return error; 160 } 161