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linux/drivers/isdn/mISDN/socket.c
David S. Miller 81b424d9e2 isdn: mISDN: socket: Fix set-but-unused variables. 
The variable 'len' is set but unused in data_sock_getsockopt().

The code should use 'len' to validate that the user's socket option is
indeed the right size.

Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-17 16:48:53 -07:00

841 lines
18 KiB
C
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/*
*
* Author Karsten Keil <kkeil@novell.com>
*
* Copyright 2008 by Karsten Keil <kkeil@novell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/mISDNif.h>
#include <linux/slab.h>
#include "core.h"
static u_int *debug;
static struct proto mISDN_proto = {
.name = "misdn",
.owner = THIS_MODULE,
.obj_size = sizeof(struct mISDN_sock)
};
#define _pms(sk) ((struct mISDN_sock *)sk)
static struct mISDN_sock_list data_sockets = {
.lock = __RW_LOCK_UNLOCKED(data_sockets.lock)
};
static struct mISDN_sock_list base_sockets = {
.lock = __RW_LOCK_UNLOCKED(base_sockets.lock)
};
#define L2_HEADER_LEN 4
static inline struct sk_buff *
_l2_alloc_skb(unsigned int len, gfp_t gfp_mask)
{
struct sk_buff *skb;
skb = alloc_skb(len + L2_HEADER_LEN, gfp_mask);
if (likely(skb))
skb_reserve(skb, L2_HEADER_LEN);
return skb;
}
static void
mISDN_sock_link(struct mISDN_sock_list *l, struct sock *sk)
{
write_lock_bh(&l->lock);
sk_add_node(sk, &l->head);
write_unlock_bh(&l->lock);
}
static void mISDN_sock_unlink(struct mISDN_sock_list *l, struct sock *sk)
{
write_lock_bh(&l->lock);
sk_del_node_init(sk);
write_unlock_bh(&l->lock);
}
static int
mISDN_send(struct mISDNchannel *ch, struct sk_buff *skb)
{
struct mISDN_sock *msk;
int err;
msk = container_of(ch, struct mISDN_sock, ch);
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s len %d %p\n", __func__, skb->len, skb);
if (msk->sk.sk_state == MISDN_CLOSED)
return -EUNATCH;
__net_timestamp(skb);
err = sock_queue_rcv_skb(&msk->sk, skb);
if (err)
printk(KERN_WARNING "%s: error %d\n", __func__, err);
return err;
}
static int
mISDN_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
struct mISDN_sock *msk;
msk = container_of(ch, struct mISDN_sock, ch);
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s(%p, %x, %p)\n", __func__, ch, cmd, arg);
switch (cmd) {
case CLOSE_CHANNEL:
msk->sk.sk_state = MISDN_CLOSED;
break;
}
return 0;
}
static inline void
mISDN_sock_cmsg(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
{
struct timeval tv;
if (_pms(sk)->cmask & MISDN_TIME_STAMP) {
skb_get_timestamp(skb, &tv);
put_cmsg(msg, SOL_MISDN, MISDN_TIME_STAMP, sizeof(tv), &tv);
}
}
static int
mISDN_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
struct sk_buff *skb;
struct sock *sk = sock->sk;
struct sockaddr_mISDN *maddr;
int copied, err;
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s: len %d, flags %x ch.nr %d, proto %x\n",
__func__, (int)len, flags, _pms(sk)->ch.nr,
sk->sk_protocol);
if (flags & (MSG_OOB))
return -EOPNOTSUPP;
if (sk->sk_state == MISDN_CLOSED)
return 0;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
if (!skb)
return err;
if (msg->msg_namelen >= sizeof(struct sockaddr_mISDN)) {
msg->msg_namelen = sizeof(struct sockaddr_mISDN);
maddr = (struct sockaddr_mISDN *)msg->msg_name;
maddr->family = AF_ISDN;
maddr->dev = _pms(sk)->dev->id;
if ((sk->sk_protocol == ISDN_P_LAPD_TE) ||
(sk->sk_protocol == ISDN_P_LAPD_NT)) {
maddr->channel = (mISDN_HEAD_ID(skb) >> 16) & 0xff;
maddr->tei = (mISDN_HEAD_ID(skb) >> 8) & 0xff;
maddr->sapi = mISDN_HEAD_ID(skb) & 0xff;
} else {
maddr->channel = _pms(sk)->ch.nr;
maddr->sapi = _pms(sk)->ch.addr & 0xFF;
maddr->tei = (_pms(sk)->ch.addr >> 8) & 0xFF;
}
} else {
if (msg->msg_namelen)
printk(KERN_WARNING "%s: too small namelen %d\n",
__func__, msg->msg_namelen);
msg->msg_namelen = 0;
}
copied = skb->len + MISDN_HEADER_LEN;
if (len < copied) {
if (flags & MSG_PEEK)
atomic_dec(&skb->users);
else
skb_queue_head(&sk->sk_receive_queue, skb);
return -ENOSPC;
}
memcpy(skb_push(skb, MISDN_HEADER_LEN), mISDN_HEAD_P(skb),
MISDN_HEADER_LEN);
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
mISDN_sock_cmsg(sk, msg, skb);
skb_free_datagram(sk, skb);
return err ? : copied;
}
static int
mISDN_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
int err = -ENOMEM;
struct sockaddr_mISDN *maddr;
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s: len %d flags %x ch %d proto %x\n",
__func__, (int)len, msg->msg_flags, _pms(sk)->ch.nr,
sk->sk_protocol);
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
return -EINVAL;
if (len < MISDN_HEADER_LEN)
return -EINVAL;
if (sk->sk_state != MISDN_BOUND)
return -EBADFD;
lock_sock(sk);
skb = _l2_alloc_skb(len, GFP_KERNEL);
if (!skb)
goto done;
if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
err = -EFAULT;
goto done;
}
memcpy(mISDN_HEAD_P(skb), skb->data, MISDN_HEADER_LEN);
skb_pull(skb, MISDN_HEADER_LEN);
if (msg->msg_namelen >= sizeof(struct sockaddr_mISDN)) {
/* if we have a address, we use it */
maddr = (struct sockaddr_mISDN *)msg->msg_name;
mISDN_HEAD_ID(skb) = maddr->channel;
} else { /* use default for L2 messages */
if ((sk->sk_protocol == ISDN_P_LAPD_TE) ||
(sk->sk_protocol == ISDN_P_LAPD_NT))
mISDN_HEAD_ID(skb) = _pms(sk)->ch.nr;
}
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s: ID:%x\n",
__func__, mISDN_HEAD_ID(skb));
err = -ENODEV;
if (!_pms(sk)->ch.peer)
goto done;
err = _pms(sk)->ch.recv(_pms(sk)->ch.peer, skb);
if (err)
goto done;
else {
skb = NULL;
err = len;
}
done:
if (skb)
kfree_skb(skb);
release_sock(sk);
return err;
}
static int
data_sock_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s(%p) sk=%p\n", __func__, sock, sk);
if (!sk)
return 0;
switch (sk->sk_protocol) {
case ISDN_P_TE_S0:
case ISDN_P_NT_S0:
case ISDN_P_TE_E1:
case ISDN_P_NT_E1:
if (sk->sk_state == MISDN_BOUND)
delete_channel(&_pms(sk)->ch);
else
mISDN_sock_unlink(&data_sockets, sk);
break;
case ISDN_P_LAPD_TE:
case ISDN_P_LAPD_NT:
case ISDN_P_B_RAW:
case ISDN_P_B_HDLC:
case ISDN_P_B_X75SLP:
case ISDN_P_B_L2DTMF:
case ISDN_P_B_L2DSP:
case ISDN_P_B_L2DSPHDLC:
delete_channel(&_pms(sk)->ch);
mISDN_sock_unlink(&data_sockets, sk);
break;
}
lock_sock(sk);
sock_orphan(sk);
skb_queue_purge(&sk->sk_receive_queue);
release_sock(sk);
sock_put(sk);
return 0;
}
static int
data_sock_ioctl_bound(struct sock *sk, unsigned int cmd, void __user *p)
{
struct mISDN_ctrl_req cq;
int err = -EINVAL, val[2];
struct mISDNchannel *bchan, *next;
lock_sock(sk);
if (!_pms(sk)->dev) {
err = -ENODEV;
goto done;
}
switch (cmd) {
case IMCTRLREQ:
if (copy_from_user(&cq, p, sizeof(cq))) {
err = -EFAULT;
break;
}
if ((sk->sk_protocol & ~ISDN_P_B_MASK) == ISDN_P_B_START) {
list_for_each_entry_safe(bchan, next,
&_pms(sk)->dev->bchannels, list) {
if (bchan->nr == cq.channel) {
err = bchan->ctrl(bchan,
CONTROL_CHANNEL, &cq);
break;
}
}
} else
err = _pms(sk)->dev->D.ctrl(&_pms(sk)->dev->D,
CONTROL_CHANNEL, &cq);
if (err)
break;
if (copy_to_user(p, &cq, sizeof(cq)))
err = -EFAULT;
break;
case IMCLEAR_L2:
if (sk->sk_protocol != ISDN_P_LAPD_NT) {
err = -EINVAL;
break;
}
val[0] = cmd;
if (get_user(val[1], (int __user *)p)) {
err = -EFAULT;
break;
}
err = _pms(sk)->dev->teimgr->ctrl(_pms(sk)->dev->teimgr,
CONTROL_CHANNEL, val);
break;
case IMHOLD_L1:
if (sk->sk_protocol != ISDN_P_LAPD_NT
&& sk->sk_protocol != ISDN_P_LAPD_TE) {
err = -EINVAL;
break;
}
val[0] = cmd;
if (get_user(val[1], (int __user *)p)) {
err = -EFAULT;
break;
}
err = _pms(sk)->dev->teimgr->ctrl(_pms(sk)->dev->teimgr,
CONTROL_CHANNEL, val);
break;
default:
err = -EINVAL;
break;
}
done:
release_sock(sk);
return err;
}
static int
data_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
int err = 0, id;
struct sock *sk = sock->sk;
struct mISDNdevice *dev;
struct mISDNversion ver;
switch (cmd) {
case IMGETVERSION:
ver.major = MISDN_MAJOR_VERSION;
ver.minor = MISDN_MINOR_VERSION;
ver.release = MISDN_RELEASE;
if (copy_to_user((void __user *)arg, &ver, sizeof(ver)))
err = -EFAULT;
break;
case IMGETCOUNT:
id = get_mdevice_count();
if (put_user(id, (int __user *)arg))
err = -EFAULT;
break;
case IMGETDEVINFO:
if (get_user(id, (int __user *)arg)) {
err = -EFAULT;
break;
}
dev = get_mdevice(id);
if (dev) {
struct mISDN_devinfo di;
memset(&di, 0, sizeof(di));
di.id = dev->id;
di.Dprotocols = dev->Dprotocols;
di.Bprotocols = dev->Bprotocols | get_all_Bprotocols();
di.protocol = dev->D.protocol;
memcpy(di.channelmap, dev->channelmap,
sizeof(di.channelmap));
di.nrbchan = dev->nrbchan;
strcpy(di.name, dev_name(&dev->dev));
if (copy_to_user((void __user *)arg, &di, sizeof(di)))
err = -EFAULT;
} else
err = -ENODEV;
break;
default:
if (sk->sk_state == MISDN_BOUND)
err = data_sock_ioctl_bound(sk, cmd,
(void __user *)arg);
else
err = -ENOTCONN;
}
return err;
}
static int data_sock_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int len)
{
struct sock *sk = sock->sk;
int err = 0, opt = 0;
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s(%p, %d, %x, %p, %d)\n", __func__, sock,
level, optname, optval, len);
lock_sock(sk);
switch (optname) {
case MISDN_TIME_STAMP:
if (get_user(opt, (int __user *)optval)) {
err = -EFAULT;
break;
}
if (opt)
_pms(sk)->cmask |= MISDN_TIME_STAMP;
else
_pms(sk)->cmask &= ~MISDN_TIME_STAMP;
break;
default:
err = -ENOPROTOOPT;
break;
}
release_sock(sk);
return err;
}
static int data_sock_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct sock *sk = sock->sk;
int len, opt;
if (get_user(len, optlen))
return -EFAULT;
if (len != sizeof(char))
return -EINVAL;
switch (optname) {
case MISDN_TIME_STAMP:
if (_pms(sk)->cmask & MISDN_TIME_STAMP)
opt = 1;
else
opt = 0;
if (put_user(opt, optval))
return -EFAULT;
break;
default:
return -ENOPROTOOPT;
}
return 0;
}
static int
data_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
struct sockaddr_mISDN *maddr = (struct sockaddr_mISDN *) addr;
struct sock *sk = sock->sk;
struct hlist_node *node;
struct sock *csk;
int err = 0;
if (*debug & DEBUG_SOCKET)
printk(KERN_DEBUG "%s(%p) sk=%p\n", __func__, sock, sk);
if (addr_len != sizeof(struct sockaddr_mISDN))
return -EINVAL;
if (!maddr || maddr->family != AF_ISDN)
return -EINVAL;
lock_sock(sk);
if (_pms(sk)->dev) {
err = -EALREADY;
goto done;
}
_pms(sk)->dev = get_mdevice(maddr->dev);
if (!_pms(sk)->dev) {
err = -ENODEV;
goto done;
}
if (sk->sk_protocol < ISDN_P_B_START) {
read_lock_bh(&data_sockets.lock);
sk_for_each(csk, node, &data_sockets.head) {
if (sk == csk)
continue;
if (_pms(csk)->dev != _pms(sk)->dev)
continue;
if (csk->sk_protocol >= ISDN_P_B_START)
continue;
if (IS_ISDN_P_TE(csk->sk_protocol)
== IS_ISDN_P_TE(sk->sk_protocol))
continue;
read_unlock_bh(&data_sockets.lock);
err = -EBUSY;
goto done;
}
read_unlock_bh(&data_sockets.lock);
}
_pms(sk)->ch.send = mISDN_send;
_pms(sk)->ch.ctrl = mISDN_ctrl;
switch (sk->sk_protocol) {
case ISDN_P_TE_S0:
case ISDN_P_NT_S0:
case ISDN_P_TE_E1:
case ISDN_P_NT_E1:
mISDN_sock_unlink(&data_sockets, sk);
err = connect_layer1(_pms(sk)->dev, &_pms(sk)->ch,
sk->sk_protocol, maddr);
if (err)
mISDN_sock_link(&data_sockets, sk);
break;
case ISDN_P_LAPD_TE:
case ISDN_P_LAPD_NT:
err = create_l2entity(_pms(sk)->dev, &_pms(sk)->ch,
sk->sk_protocol, maddr);
break;
case ISDN_P_B_RAW:
case ISDN_P_B_HDLC:
case ISDN_P_B_X75SLP:
case ISDN_P_B_L2DTMF:
case ISDN_P_B_L2DSP:
case ISDN_P_B_L2DSPHDLC:
err = connect_Bstack(_pms(sk)->dev, &_pms(sk)->ch,
sk->sk_protocol, maddr);
break;
default:
err = -EPROTONOSUPPORT;
}
if (err)
goto done;
sk->sk_state = MISDN_BOUND;
_pms(sk)->ch.protocol = sk->sk_protocol;
done:
release_sock(sk);
return err;
}
static int
data_sock_getname(struct socket *sock, struct sockaddr *addr,
int *addr_len, int peer)
{
struct sockaddr_mISDN *maddr = (struct sockaddr_mISDN *) addr;
struct sock *sk = sock->sk;
if (!_pms(sk)->dev)
return -EBADFD;
lock_sock(sk);
*addr_len = sizeof(*maddr);
maddr->dev = _pms(sk)->dev->id;
maddr->channel = _pms(sk)->ch.nr;
maddr->sapi = _pms(sk)->ch.addr & 0xff;
maddr->tei = (_pms(sk)->ch.addr >> 8) & 0xff;
release_sock(sk);
return 0;
}
static const struct proto_ops data_sock_ops = {
.family = PF_ISDN,
.owner = THIS_MODULE,
.release = data_sock_release,
.ioctl = data_sock_ioctl,
.bind = data_sock_bind,
.getname = data_sock_getname,
.sendmsg = mISDN_sock_sendmsg,
.recvmsg = mISDN_sock_recvmsg,
.poll = datagram_poll,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = data_sock_setsockopt,
.getsockopt = data_sock_getsockopt,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.mmap = sock_no_mmap
};
static int
data_sock_create(struct net *net, struct socket *sock, int protocol)
{
struct sock *sk;
if (sock->type != SOCK_DGRAM)
return -ESOCKTNOSUPPORT;
sk = sk_alloc(net, PF_ISDN, GFP_KERNEL, &mISDN_proto);
if (!sk)
return -ENOMEM;
sock_init_data(sock, sk);
sock->ops = &data_sock_ops;
sock->state = SS_UNCONNECTED;
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_protocol = protocol;
sk->sk_state = MISDN_OPEN;
mISDN_sock_link(&data_sockets, sk);
return 0;
}
static int
base_sock_release(struct socket *sock)
{
struct sock *sk = sock->sk;
printk(KERN_DEBUG "%s(%p) sk=%p\n", __func__, sock, sk);
if (!sk)
return 0;
mISDN_sock_unlink(&base_sockets, sk);
sock_orphan(sk);
sock_put(sk);
return 0;
}
static int
base_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
int err = 0, id;
struct mISDNdevice *dev;
struct mISDNversion ver;
switch (cmd) {
case IMGETVERSION:
ver.major = MISDN_MAJOR_VERSION;
ver.minor = MISDN_MINOR_VERSION;
ver.release = MISDN_RELEASE;
if (copy_to_user((void __user *)arg, &ver, sizeof(ver)))
err = -EFAULT;
break;
case IMGETCOUNT:
id = get_mdevice_count();
if (put_user(id, (int __user *)arg))
err = -EFAULT;
break;
case IMGETDEVINFO:
if (get_user(id, (int __user *)arg)) {
err = -EFAULT;
break;
}
dev = get_mdevice(id);
if (dev) {
struct mISDN_devinfo di;
memset(&di, 0, sizeof(di));
di.id = dev->id;
di.Dprotocols = dev->Dprotocols;
di.Bprotocols = dev->Bprotocols | get_all_Bprotocols();
di.protocol = dev->D.protocol;
memcpy(di.channelmap, dev->channelmap,
sizeof(di.channelmap));
di.nrbchan = dev->nrbchan;
strcpy(di.name, dev_name(&dev->dev));
if (copy_to_user((void __user *)arg, &di, sizeof(di)))
err = -EFAULT;
} else
err = -ENODEV;
break;
case IMSETDEVNAME:
{
struct mISDN_devrename dn;
if (copy_from_user(&dn, (void __user *)arg,
sizeof(dn))) {
err = -EFAULT;
break;
}
dev = get_mdevice(dn.id);
if (dev)
err = device_rename(&dev->dev, dn.name);
else
err = -ENODEV;
}
break;
default:
err = -EINVAL;
}
return err;
}
static int
base_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
struct sockaddr_mISDN *maddr = (struct sockaddr_mISDN *) addr;
struct sock *sk = sock->sk;
int err = 0;
if (!maddr || maddr->family != AF_ISDN)
return -EINVAL;
lock_sock(sk);
if (_pms(sk)->dev) {
err = -EALREADY;
goto done;
}
_pms(sk)->dev = get_mdevice(maddr->dev);
if (!_pms(sk)->dev) {
err = -ENODEV;
goto done;
}
sk->sk_state = MISDN_BOUND;
done:
release_sock(sk);
return err;
}
static const struct proto_ops base_sock_ops = {
.family = PF_ISDN,
.owner = THIS_MODULE,
.release = base_sock_release,
.ioctl = base_sock_ioctl,
.bind = base_sock_bind,
.getname = sock_no_getname,
.sendmsg = sock_no_sendmsg,
.recvmsg = sock_no_recvmsg,
.poll = sock_no_poll,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.mmap = sock_no_mmap
};
static int
base_sock_create(struct net *net, struct socket *sock, int protocol)
{
struct sock *sk;
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sk = sk_alloc(net, PF_ISDN, GFP_KERNEL, &mISDN_proto);
if (!sk)
return -ENOMEM;
sock_init_data(sock, sk);
sock->ops = &base_sock_ops;
sock->state = SS_UNCONNECTED;
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_protocol = protocol;
sk->sk_state = MISDN_OPEN;
mISDN_sock_link(&base_sockets, sk);
return 0;
}
static int
mISDN_sock_create(struct net *net, struct socket *sock, int proto, int kern)
{
int err = -EPROTONOSUPPORT;
switch (proto) {
case ISDN_P_BASE:
err = base_sock_create(net, sock, proto);
break;
case ISDN_P_TE_S0:
case ISDN_P_NT_S0:
case ISDN_P_TE_E1:
case ISDN_P_NT_E1:
case ISDN_P_LAPD_TE:
case ISDN_P_LAPD_NT:
case ISDN_P_B_RAW:
case ISDN_P_B_HDLC:
case ISDN_P_B_X75SLP:
case ISDN_P_B_L2DTMF:
case ISDN_P_B_L2DSP:
case ISDN_P_B_L2DSPHDLC:
err = data_sock_create(net, sock, proto);
break;
default:
return err;
}
return err;
}
static const struct net_proto_family mISDN_sock_family_ops = {
.owner = THIS_MODULE,
.family = PF_ISDN,
.create = mISDN_sock_create,
};
int
misdn_sock_init(u_int *deb)
{
int err;
debug = deb;
err = sock_register(&mISDN_sock_family_ops);
if (err)
printk(KERN_ERR "%s: error(%d)\n", __func__, err);
return err;
}
void
misdn_sock_cleanup(void)
{
sock_unregister(PF_ISDN);
}
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