cregit-Linux how code gets into the kernel

Release 4.8 net/atm/ioctl.c

Directory: net/atm
/* ATM ioctl handling */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
/* 2003 John Levon  <> */

#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); }


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void deregister_atm_ioctl(struct atm_ioctl *ioctl) { mutex_lock(&ioctl_mutex); list_del(&ioctl->list); mutex_unlock(&ioctl_mutex); }


chas williamschas williams2893.33%150.00%
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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 SIOCGSTAMP: /* borrowed from IP */ #ifdef CONFIG_COMPAT if (compat) error = compat_sock_get_timestamp(sk, argp); else #endif error = sock_get_timestamp(sk, argp); goto done; case SIOCGSTAMPNS: /* borrowed from IP */ #ifdef CONFIG_COMPAT if (compat) error = compat_sock_get_timestampns(sk, argp); else #endif error = sock_get_timestampns(sk, argp); 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; }


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int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { return do_vcc_ioctl(sock, cmd, arg, 0); }


david woodhousedavid woodhouse30100.00%1100.00%

#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; }


arnd bergmannarnd bergmann173100.00%1100.00%

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; }


arnd bergmannarnd bergmann171100.00%1100.00%

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; }


arnd bergmannarnd bergmann197100.00%1100.00%

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); }


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Directory: net/atm
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