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 199