366 lines
9.3 KiB
C
366 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* ATM ioctl handling */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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/* 2003 John Levon <levon@movementarian.org> */
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/kmod.h>
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#include <linux/net.h> /* struct socket, struct proto_ops */
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#include <linux/atm.h> /* ATM stuff */
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#include <linux/atmdev.h>
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#include <linux/atmclip.h> /* CLIP_*ENCAP */
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#include <linux/atmarp.h> /* manifest constants */
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#include <linux/capability.h>
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#include <linux/sonet.h> /* for ioctls */
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#include <linux/atmsvc.h>
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#include <linux/atmmpc.h>
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#include <net/atmclip.h>
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#include <linux/atmlec.h>
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#include <linux/mutex.h>
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#include <asm/ioctls.h>
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#include <net/compat.h>
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#include "resources.h"
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#include "signaling.h" /* for WAITING and sigd_attach */
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#include "common.h"
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static DEFINE_MUTEX(ioctl_mutex);
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static LIST_HEAD(ioctl_list);
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void register_atm_ioctl(struct atm_ioctl *ioctl)
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{
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mutex_lock(&ioctl_mutex);
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list_add_tail(&ioctl->list, &ioctl_list);
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mutex_unlock(&ioctl_mutex);
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}
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EXPORT_SYMBOL(register_atm_ioctl);
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void deregister_atm_ioctl(struct atm_ioctl *ioctl)
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{
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mutex_lock(&ioctl_mutex);
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list_del(&ioctl->list);
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mutex_unlock(&ioctl_mutex);
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}
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EXPORT_SYMBOL(deregister_atm_ioctl);
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static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
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unsigned long arg, int compat)
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{
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struct sock *sk = sock->sk;
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struct atm_vcc *vcc;
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int error;
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struct list_head *pos;
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void __user *argp = (void __user *)arg;
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void __user *buf;
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int __user *len;
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vcc = ATM_SD(sock);
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switch (cmd) {
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case SIOCOUTQ:
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if (sock->state != SS_CONNECTED ||
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!test_bit(ATM_VF_READY, &vcc->flags)) {
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error = -EINVAL;
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goto done;
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}
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error = put_user(sk->sk_sndbuf - sk_wmem_alloc_get(sk),
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(int __user *)argp) ? -EFAULT : 0;
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goto done;
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case SIOCINQ:
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{
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struct sk_buff *skb;
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int amount;
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if (sock->state != SS_CONNECTED) {
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error = -EINVAL;
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goto done;
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}
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spin_lock_irq(&sk->sk_receive_queue.lock);
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skb = skb_peek(&sk->sk_receive_queue);
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amount = skb ? skb->len : 0;
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spin_unlock_irq(&sk->sk_receive_queue.lock);
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error = put_user(amount, (int __user *)argp) ? -EFAULT : 0;
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goto done;
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}
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case ATM_SETSC:
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net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",
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current->comm, task_pid_nr(current));
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error = 0;
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goto done;
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case ATMSIGD_CTRL:
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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/*
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* The user/kernel protocol for exchanging signalling
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* info uses kernel pointers as opaque references,
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* so the holder of the file descriptor can scribble
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* on the kernel... so we should make sure that we
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* have the same privileges that /proc/kcore needs
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*/
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if (!capable(CAP_SYS_RAWIO)) {
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error = -EPERM;
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goto done;
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}
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#ifdef CONFIG_COMPAT
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/* WTF? I don't even want to _think_ about making this
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work for 32-bit userspace. TBH I don't really want
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to think about it at all. dwmw2. */
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if (compat) {
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net_warn_ratelimited("32-bit task cannot be atmsigd\n");
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error = -EINVAL;
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goto done;
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}
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#endif
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error = sigd_attach(vcc);
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if (!error)
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sock->state = SS_CONNECTED;
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goto done;
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case ATM_SETBACKEND:
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case ATM_NEWBACKENDIF:
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{
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atm_backend_t backend;
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error = get_user(backend, (atm_backend_t __user *)argp);
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if (error)
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goto done;
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switch (backend) {
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case ATM_BACKEND_PPP:
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request_module("pppoatm");
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break;
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case ATM_BACKEND_BR2684:
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request_module("br2684");
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break;
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}
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break;
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}
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case ATMMPC_CTRL:
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case ATMMPC_DATA:
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request_module("mpoa");
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break;
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case ATMARPD_CTRL:
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request_module("clip");
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break;
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case ATMLEC_CTRL:
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request_module("lec");
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break;
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}
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error = -ENOIOCTLCMD;
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mutex_lock(&ioctl_mutex);
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list_for_each(pos, &ioctl_list) {
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struct atm_ioctl *ic = list_entry(pos, struct atm_ioctl, list);
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if (try_module_get(ic->owner)) {
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error = ic->ioctl(sock, cmd, arg);
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module_put(ic->owner);
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if (error != -ENOIOCTLCMD)
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break;
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}
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}
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mutex_unlock(&ioctl_mutex);
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if (error != -ENOIOCTLCMD)
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goto done;
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if (cmd == ATM_GETNAMES) {
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if (IS_ENABLED(CONFIG_COMPAT) && compat) {
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#ifdef CONFIG_COMPAT
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struct compat_atm_iobuf __user *ciobuf = argp;
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compat_uptr_t cbuf;
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len = &ciobuf->length;
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if (get_user(cbuf, &ciobuf->buffer))
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return -EFAULT;
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buf = compat_ptr(cbuf);
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#endif
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} else {
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struct atm_iobuf __user *iobuf = argp;
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len = &iobuf->length;
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if (get_user(buf, &iobuf->buffer))
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return -EFAULT;
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}
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error = atm_getnames(buf, len);
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} else {
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int number;
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if (IS_ENABLED(CONFIG_COMPAT) && compat) {
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#ifdef CONFIG_COMPAT
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struct compat_atmif_sioc __user *csioc = argp;
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compat_uptr_t carg;
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len = &csioc->length;
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if (get_user(carg, &csioc->arg))
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return -EFAULT;
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buf = compat_ptr(carg);
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if (get_user(number, &csioc->number))
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return -EFAULT;
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#endif
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} else {
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struct atmif_sioc __user *sioc = argp;
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len = &sioc->length;
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if (get_user(buf, &sioc->arg))
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return -EFAULT;
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if (get_user(number, &sioc->number))
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return -EFAULT;
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}
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error = atm_dev_ioctl(cmd, buf, len, number, compat);
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}
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done:
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return error;
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}
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int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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return do_vcc_ioctl(sock, cmd, arg, 0);
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}
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#ifdef CONFIG_COMPAT
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/*
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* FIXME:
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* The compat_ioctl handling is duplicated, using both these conversion
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* routines and the compat argument to the actual handlers. Both
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* versions are somewhat incomplete and should be merged, e.g. by
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* moving the ioctl number translation into the actual handlers and
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* killing the conversion code.
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*
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* -arnd, November 2009
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*/
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#define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
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#define ATM_GETNAMES32 _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
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#define ATM_GETTYPE32 _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
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#define ATM_GETESI32 _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
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#define ATM_GETADDR32 _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
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#define ATM_RSTADDR32 _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
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#define ATM_ADDADDR32 _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
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#define ATM_DELADDR32 _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
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#define ATM_GETCIRANGE32 _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
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#define ATM_SETCIRANGE32 _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
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#define ATM_SETESI32 _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
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#define ATM_SETESIF32 _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
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#define ATM_GETSTAT32 _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
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#define ATM_GETSTATZ32 _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
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#define ATM_GETLOOP32 _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
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#define ATM_SETLOOP32 _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
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#define ATM_QUERYLOOP32 _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
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static struct {
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unsigned int cmd32;
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unsigned int cmd;
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} atm_ioctl_map[] = {
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{ ATM_GETLINKRATE32, ATM_GETLINKRATE },
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{ ATM_GETNAMES32, ATM_GETNAMES },
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{ ATM_GETTYPE32, ATM_GETTYPE },
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{ ATM_GETESI32, ATM_GETESI },
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{ ATM_GETADDR32, ATM_GETADDR },
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{ ATM_RSTADDR32, ATM_RSTADDR },
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{ ATM_ADDADDR32, ATM_ADDADDR },
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{ ATM_DELADDR32, ATM_DELADDR },
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{ ATM_GETCIRANGE32, ATM_GETCIRANGE },
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{ ATM_SETCIRANGE32, ATM_SETCIRANGE },
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{ ATM_SETESI32, ATM_SETESI },
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{ ATM_SETESIF32, ATM_SETESIF },
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{ ATM_GETSTAT32, ATM_GETSTAT },
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{ ATM_GETSTATZ32, ATM_GETSTATZ },
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{ ATM_GETLOOP32, ATM_GETLOOP },
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{ ATM_SETLOOP32, ATM_SETLOOP },
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{ ATM_QUERYLOOP32, ATM_QUERYLOOP },
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};
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#define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
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static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
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unsigned long arg)
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{
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struct compat_atm_iobuf __user *iobuf32 = compat_ptr(arg);
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u32 data;
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if (get_user(data, &iobuf32->buffer))
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return -EFAULT;
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return atm_getnames(&iobuf32->length, compat_ptr(data));
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}
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static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
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unsigned long arg)
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{
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struct compat_atmif_sioc __user *sioc32 = compat_ptr(arg);
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int number;
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u32 data;
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if (get_user(data, &sioc32->arg) || get_user(number, &sioc32->number))
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return -EFAULT;
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return atm_dev_ioctl(cmd, compat_ptr(data), &sioc32->length, number, 0);
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}
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static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
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unsigned long arg)
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{
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int i;
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unsigned int cmd = 0;
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switch (cmd32) {
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case SONET_GETSTAT:
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case SONET_GETSTATZ:
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case SONET_GETDIAG:
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case SONET_SETDIAG:
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case SONET_CLRDIAG:
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case SONET_SETFRAMING:
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case SONET_GETFRAMING:
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case SONET_GETFRSENSE:
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return do_atmif_sioc(sock, cmd32, arg);
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}
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for (i = 0; i < NR_ATM_IOCTL; i++) {
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if (cmd32 == atm_ioctl_map[i].cmd32) {
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cmd = atm_ioctl_map[i].cmd;
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break;
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}
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}
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if (i == NR_ATM_IOCTL)
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return -EINVAL;
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switch (cmd) {
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case ATM_GETNAMES:
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return do_atm_iobuf(sock, cmd, arg);
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case ATM_GETLINKRATE:
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case ATM_GETTYPE:
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case ATM_GETESI:
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case ATM_GETADDR:
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case ATM_RSTADDR:
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case ATM_ADDADDR:
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case ATM_DELADDR:
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case ATM_GETCIRANGE:
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case ATM_SETCIRANGE:
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case ATM_SETESI:
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case ATM_SETESIF:
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case ATM_GETSTAT:
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case ATM_GETSTATZ:
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case ATM_GETLOOP:
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case ATM_SETLOOP:
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case ATM_QUERYLOOP:
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return do_atmif_sioc(sock, cmd, arg);
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}
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return -EINVAL;
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}
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int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
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unsigned long arg)
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{
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int ret;
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ret = do_vcc_ioctl(sock, cmd, arg, 1);
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if (ret != -ENOIOCTLCMD)
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return ret;
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return do_atm_ioctl(sock, cmd, arg);
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}
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#endif
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