/net/atm/ioctl.c
http://github.com/mirrors/linux · C · 354 lines · 289 code · 41 blank · 24 comment · 33 complexity · 32df8934759110f231730fa0bba2896d MD5 · raw file
- // SPDX-License-Identifier: GPL-2.0
- /* ATM ioctl handling */
- /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
- /* 2003 John Levon <levon@movementarian.org> */
- #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
- #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 <linux/mutex.h>
- #include <asm/ioctls.h>
- #include <net/compat.h>
- #include "resources.h"
- #include "signaling.h" /* for WAITING and sigd_attach */
- #include "common.h"
- static DEFINE_MUTEX(ioctl_mutex);
- static LIST_HEAD(ioctl_list);
- void register_atm_ioctl(struct atm_ioctl *ioctl)
- {
- mutex_lock(&ioctl_mutex);
- list_add_tail(&ioctl->list, &ioctl_list);
- mutex_unlock(&ioctl_mutex);
- }
- EXPORT_SYMBOL(register_atm_ioctl);
- void deregister_atm_ioctl(struct atm_ioctl *ioctl)
- {
- mutex_lock(&ioctl_mutex);
- list_del(&ioctl->list);
- mutex_unlock(&ioctl_mutex);
- }
- EXPORT_SYMBOL(deregister_atm_ioctl);
- static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
- unsigned long arg, int compat)
- {
- 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 - sk_wmem_alloc_get(sk),
- (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 ATM_SETSC:
- net_warn_ratelimited("ATM_SETSC is obsolete; used by %s:%d\n",
- current->comm, task_pid_nr(current));
- 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 privileges that /proc/kcore needs
- */
- if (!capable(CAP_SYS_RAWIO)) {
- error = -EPERM;
- goto done;
- }
- #ifdef CONFIG_COMPAT
- /* WTF? I don't even want to _think_ about making this
- work for 32-bit userspace. TBH I don't really want
- to think about it at all. dwmw2. */
- if (compat) {
- net_warn_ratelimited("32-bit task cannot be atmsigd\n");
- error = -EINVAL;
- goto done;
- }
- #endif
- 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;
- mutex_lock(&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;
- }
- }
- mutex_unlock(&ioctl_mutex);
- if (error != -ENOIOCTLCMD)
- goto done;
- error = atm_dev_ioctl(cmd, argp, compat);
- done:
- return error;
- }
- int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- return do_vcc_ioctl(sock, cmd, arg, 0);
- }
- #ifdef CONFIG_COMPAT
- /*
- * FIXME:
- * The compat_ioctl handling is duplicated, using both these conversion
- * routines and the compat argument to the actual handlers. Both
- * versions are somewhat incomplete and should be merged, e.g. by
- * moving the ioctl number translation into the actual handlers and
- * killing the conversion code.
- *
- * -arnd, November 2009
- */
- #define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
- #define ATM_GETNAMES32 _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
- #define ATM_GETTYPE32 _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
- #define ATM_GETESI32 _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
- #define ATM_GETADDR32 _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
- #define ATM_RSTADDR32 _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
- #define ATM_ADDADDR32 _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
- #define ATM_DELADDR32 _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
- #define ATM_GETCIRANGE32 _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
- #define ATM_SETCIRANGE32 _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
- #define ATM_SETESI32 _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
- #define ATM_SETESIF32 _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
- #define ATM_GETSTAT32 _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
- #define ATM_GETSTATZ32 _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
- #define ATM_GETLOOP32 _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
- #define ATM_SETLOOP32 _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
- #define ATM_QUERYLOOP32 _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
- static struct {
- unsigned int cmd32;
- unsigned int cmd;
- } atm_ioctl_map[] = {
- { ATM_GETLINKRATE32, ATM_GETLINKRATE },
- { ATM_GETNAMES32, ATM_GETNAMES },
- { ATM_GETTYPE32, ATM_GETTYPE },
- { ATM_GETESI32, ATM_GETESI },
- { ATM_GETADDR32, ATM_GETADDR },
- { ATM_RSTADDR32, ATM_RSTADDR },
- { ATM_ADDADDR32, ATM_ADDADDR },
- { ATM_DELADDR32, ATM_DELADDR },
- { ATM_GETCIRANGE32, ATM_GETCIRANGE },
- { ATM_SETCIRANGE32, ATM_SETCIRANGE },
- { ATM_SETESI32, ATM_SETESI },
- { ATM_SETESIF32, ATM_SETESIF },
- { ATM_GETSTAT32, ATM_GETSTAT },
- { ATM_GETSTATZ32, ATM_GETSTATZ },
- { ATM_GETLOOP32, ATM_GETLOOP },
- { ATM_SETLOOP32, ATM_SETLOOP },
- { ATM_QUERYLOOP32, ATM_QUERYLOOP },
- };
- #define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
- static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
- unsigned long arg)
- {
- struct atm_iobuf __user *iobuf;
- struct compat_atm_iobuf __user *iobuf32;
- u32 data;
- void __user *datap;
- int len, err;
- iobuf = compat_alloc_user_space(sizeof(*iobuf));
- iobuf32 = compat_ptr(arg);
- if (get_user(len, &iobuf32->length) ||
- get_user(data, &iobuf32->buffer))
- return -EFAULT;
- datap = compat_ptr(data);
- if (put_user(len, &iobuf->length) ||
- put_user(datap, &iobuf->buffer))
- return -EFAULT;
- err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
- if (!err) {
- if (copy_in_user(&iobuf32->length, &iobuf->length,
- sizeof(int)))
- err = -EFAULT;
- }
- return err;
- }
- static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
- unsigned long arg)
- {
- struct atmif_sioc __user *sioc;
- struct compat_atmif_sioc __user *sioc32;
- u32 data;
- void __user *datap;
- int err;
- sioc = compat_alloc_user_space(sizeof(*sioc));
- sioc32 = compat_ptr(arg);
- if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int)) ||
- get_user(data, &sioc32->arg))
- return -EFAULT;
- datap = compat_ptr(data);
- if (put_user(datap, &sioc->arg))
- return -EFAULT;
- err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
- if (!err) {
- if (copy_in_user(&sioc32->length, &sioc->length,
- sizeof(int)))
- err = -EFAULT;
- }
- return err;
- }
- static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
- unsigned long arg)
- {
- int i;
- unsigned int cmd = 0;
- switch (cmd32) {
- case SONET_GETSTAT:
- case SONET_GETSTATZ:
- case SONET_GETDIAG:
- case SONET_SETDIAG:
- case SONET_CLRDIAG:
- case SONET_SETFRAMING:
- case SONET_GETFRAMING:
- case SONET_GETFRSENSE:
- return do_atmif_sioc(sock, cmd32, arg);
- }
- for (i = 0; i < NR_ATM_IOCTL; i++) {
- if (cmd32 == atm_ioctl_map[i].cmd32) {
- cmd = atm_ioctl_map[i].cmd;
- break;
- }
- }
- if (i == NR_ATM_IOCTL)
- return -EINVAL;
- switch (cmd) {
- case ATM_GETNAMES:
- return do_atm_iobuf(sock, cmd, arg);
- case ATM_GETLINKRATE:
- case ATM_GETTYPE:
- case ATM_GETESI:
- case ATM_GETADDR:
- case ATM_RSTADDR:
- case ATM_ADDADDR:
- case ATM_DELADDR:
- case ATM_GETCIRANGE:
- case ATM_SETCIRANGE:
- case ATM_SETESI:
- case ATM_SETESIF:
- case ATM_GETSTAT:
- case ATM_GETSTATZ:
- case ATM_GETLOOP:
- case ATM_SETLOOP:
- case ATM_QUERYLOOP:
- return do_atmif_sioc(sock, cmd, arg);
- }
- return -EINVAL;
- }
- int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
- unsigned long arg)
- {
- int ret;
- ret = do_vcc_ioctl(sock, cmd, arg, 1);
- if (ret != -ENOIOCTLCMD)
- return ret;
- return do_atm_ioctl(sock, cmd, arg);
- }
- #endif