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 200