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362 lines
9.2 KiB
362 lines
9.2 KiB
// 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 <[email protected]> */ |
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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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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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skb = skb_peek(&sk->sk_receive_queue); |
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error = put_user(skb ? skb->len : 0, |
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(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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