/* ATM ioctl handling */ /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ /* 2003 John Levon <levon@movementarian.org> */ #include <linux/config.h> #include <linux/module.h> #include <linux/kmod.h> #include <linux/net.h> /* struct socket, struct proto_ops */ #include <linux/atm.h> /* ATM stuff */ #include <linux/atmdev.h> #include <linux/atmclip.h> /* CLIP_*ENCAP */ #include <linux/atmarp.h> /* manifest constants */ #include <linux/capability.h> #include <linux/sonet.h> /* for ioctls */ #include <linux/atmsvc.h> #include <linux/atmmpc.h> #include <net/atmclip.h> #include <linux/atmlec.h> #include <asm/ioctls.h> #include "resources.h" #include "signaling.h" /* for WAITING and sigd_attach */ #include "common.h" static DECLARE_MUTEX(ioctl_mutex); static LIST_HEAD(ioctl_list); void register_atm_ioctl(struct atm_ioctl *ioctl) { down(&ioctl_mutex); list_add_tail(&ioctl->list, &ioctl_list); up(&ioctl_mutex); } void deregister_atm_ioctl(struct atm_ioctl *ioctl) { down(&ioctl_mutex); list_del(&ioctl->list); up(&ioctl_mutex); } EXPORT_SYMBOL(register_atm_ioctl); EXPORT_SYMBOL(deregister_atm_ioctl); int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; struct atm_vcc *vcc; int error; struct list_head * pos; void __user *argp = (void __user *)arg; vcc = ATM_SD(sock); switch (cmd) { case SIOCOUTQ: if (sock->state != SS_CONNECTED || !test_bit(ATM_VF_READY, &vcc->flags)) { error = -EINVAL; goto done; } error = put_user(sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc), (int __user *) argp) ? -EFAULT : 0; goto done; case SIOCINQ: { struct sk_buff *skb; if (sock->state != SS_CONNECTED) { error = -EINVAL; goto done; } skb = skb_peek(&sk->sk_receive_queue); error = put_user(skb ? skb->len : 0, (int __user *)argp) ? -EFAULT : 0; goto done; } case SIOCGSTAMP: /* borrowed from IP */ error = sock_get_timestamp(sk, argp); goto done; case ATM_SETSC: printk(KERN_WARNING "ATM_SETSC is obsolete\n"); error = 0; goto done; case ATMSIGD_CTRL: if (!capable(CAP_NET_ADMIN)) { error = -EPERM; goto done; } /* * The user/kernel protocol for exchanging signalling * info uses kernel pointers as opaque references, * so the holder of the file descriptor can scribble * on the kernel... so we should make sure that we * have the same privledges that /proc/kcore needs */ if (!capable(CAP_SYS_RAWIO)) { error = -EPERM; goto done; } error = sigd_attach(vcc); if (!error) sock->state = SS_CONNECTED; goto done; case ATM_SETBACKEND: case ATM_NEWBACKENDIF: { atm_backend_t backend; error = get_user(backend, (atm_backend_t __user *) argp); if (error) goto done; switch (backend) { case ATM_BACKEND_PPP: request_module("pppoatm"); break; case ATM_BACKEND_BR2684: request_module("br2684"); break; } } break; case ATMMPC_CTRL: case ATMMPC_DATA: request_module("mpoa"); break; case ATMARPD_CTRL: request_module("clip"); break; case ATMLEC_CTRL: request_module("lec"); break; } error = -ENOIOCTLCMD; down(&ioctl_mutex); list_for_each(pos, &ioctl_list) { struct atm_ioctl * ic = list_entry(pos, struct atm_ioctl, list); if (try_module_get(ic->owner)) { error = ic->ioctl(sock, cmd, arg); module_put(ic->owner); if (error != -ENOIOCTLCMD) break; } } up(&ioctl_mutex); if (error != -ENOIOCTLCMD) goto done; error = atm_dev_ioctl(cmd, argp); done: return error; }