Exemple #1
0
static int raw_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);

	unregister_netdevice_notifier(&ro->notifier);

	lock_sock(sk);

	/* remove current filters & unregister */
	if (ro->bound) {
		if (ro->ifindex) {
			struct net_device *dev;

			dev = dev_get_by_index(&init_net, ro->ifindex);
			if (dev) {
				raw_disable_allfilters(dev, sk);
				dev_put(dev);
			}
		} else
			raw_disable_allfilters(NULL, sk);
	}

	if (ro->count > 1)
		kfree(ro->filter);

	ro->ifindex = 0;
	ro->bound   = 0;
	ro->count   = 0;

	sock_orphan(sk);
	sock->sk = NULL;

	release_sock(sk);
	sock_put(sk);

	return 0;
}
Exemple #2
0
static int raw_init(struct sock *sk)
{
	struct raw_sock *ro = raw_sk(sk);

	ro->bound            = 0;
	ro->ifindex          = 0;

	/* set default filter to single entry dfilter */
	ro->dfilter.can_id   = 0;
	ro->dfilter.can_mask = MASK_ALL;
	ro->filter           = &ro->dfilter;
	ro->count            = 1;

	/* set default loopback behaviour */
	ro->loopback         = 1;
	ro->recv_own_msgs    = 0;

	/* set notifier */
	ro->notifier.notifier_call = raw_notifier;

	register_netdevice_notifier(&ro->notifier);

	return 0;
}
Exemple #3
0
static int raw_getsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	int len;
	void *val;
	int err = 0;

	if (level != SOL_CAN_RAW)
		return -EINVAL;
	if (get_user(len, optlen))
		return -EFAULT;
	if (len < 0)
		return -EINVAL;

	switch (optname) {

	case CAN_RAW_FILTER:
		lock_sock(sk);
		if (ro->count > 0) {
			int fsize = ro->count * sizeof(struct can_filter);
			if (len > fsize)
				len = fsize;
			err = copy_to_user(optval, ro->filter, len);
		} else
			len = 0;
		release_sock(sk);

		if (!err)
			err = put_user(len, optlen);
		return err;

	case CAN_RAW_ERR_FILTER:
		if (len > sizeof(can_err_mask_t))
			len = sizeof(can_err_mask_t);
		val = &ro->err_mask;
		break;

	case CAN_RAW_LOOPBACK:
		if (len > sizeof(int))
			len = sizeof(int);
		val = &ro->loopback;
		break;

	case CAN_RAW_RECV_OWN_MSGS:
		if (len > sizeof(int))
			len = sizeof(int);
		val = &ro->recv_own_msgs;
		break;

	default:
		return -ENOPROTOOPT;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, val, len))
		return -EFAULT;
	return 0;
}
Exemple #4
0
static int raw_setsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	struct can_filter *filter = NULL;  /* dyn. alloc'ed filters */
	struct can_filter sfilter;         /* single filter */
	struct net_device *dev = NULL;
	can_err_mask_t err_mask = 0;
	int count = 0;
	int err = 0;

	if (level != SOL_CAN_RAW)
		return -EINVAL;
	if (optlen < 0)
		return -EINVAL;

	switch (optname) {

	case CAN_RAW_FILTER:
		if (optlen % sizeof(struct can_filter) != 0)
			return -EINVAL;

		count = optlen / sizeof(struct can_filter);

		if (count > 1) {
			/* filter does not fit into dfilter => alloc space */
			filter = kmalloc(optlen, GFP_KERNEL);
			if (!filter)
				return -ENOMEM;

			err = copy_from_user(filter, optval, optlen);
			if (err) {
				kfree(filter);
				return err;
			}
		} else if (count == 1) {
			err = copy_from_user(&sfilter, optval, optlen);
			if (err)
				return err;
		}

		lock_sock(sk);

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(&init_net, ro->ifindex);

		if (ro->bound) {
			/* (try to) register the new filters */
			if (count == 1)
				err = raw_enable_filters(dev, sk, &sfilter, 1);
			else
				err = raw_enable_filters(dev, sk, filter,
							 count);
			if (err) {
				if (count > 1)
					kfree(filter);
				goto out_fil;
			}

			/* remove old filter registrations */
			raw_disable_filters(dev, sk, ro->filter, ro->count);
		}

		/* remove old filter space */
		if (ro->count > 1)
			kfree(ro->filter);

		/* link new filters to the socket */
		if (count == 1) {
			/* copy filter data for single filter */
			ro->dfilter = sfilter;
			filter = &ro->dfilter;
		}
		ro->filter = filter;
		ro->count  = count;

 out_fil:
		if (dev)
			dev_put(dev);

		release_sock(sk);

		break;

	case CAN_RAW_ERR_FILTER:
		if (optlen != sizeof(err_mask))
			return -EINVAL;

		err = copy_from_user(&err_mask, optval, optlen);
		if (err)
			return err;

		err_mask &= CAN_ERR_MASK;

		lock_sock(sk);

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(&init_net, ro->ifindex);

		/* remove current error mask */
		if (ro->bound) {
			/* (try to) register the new err_mask */
			err = raw_enable_errfilter(dev, sk, err_mask);

			if (err)
				goto out_err;

			/* remove old err_mask registration */
			raw_disable_errfilter(dev, sk, ro->err_mask);
		}

		/* link new err_mask to the socket */
		ro->err_mask = err_mask;

 out_err:
		if (dev)
			dev_put(dev);

		release_sock(sk);

		break;

	case CAN_RAW_LOOPBACK:
		if (optlen != sizeof(ro->loopback))
			return -EINVAL;

		err = copy_from_user(&ro->loopback, optval, optlen);

		break;

	case CAN_RAW_RECV_OWN_MSGS:
		if (optlen != sizeof(ro->recv_own_msgs))
			return -EINVAL;

		err = copy_from_user(&ro->recv_own_msgs, optval, optlen);

		break;

	default:
		return -ENOPROTOOPT;
	}
	return err;
}
Exemple #5
0
static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
{
	struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	int ifindex;
	int err = 0;
	int notify_enetdown = 0;

	if (len < sizeof(*addr))
		return -EINVAL;

	lock_sock(sk);

	if (ro->bound && addr->can_ifindex == ro->ifindex)
		goto out;

	if (addr->can_ifindex) {
		struct net_device *dev;

		dev = dev_get_by_index(&init_net, addr->can_ifindex);
		if (!dev) {
			err = -ENODEV;
			goto out;
		}
		if (dev->type != ARPHRD_CAN) {
			dev_put(dev);
			err = -ENODEV;
			goto out;
		}
		if (!(dev->flags & IFF_UP))
			notify_enetdown = 1;

		ifindex = dev->ifindex;

		/* filters set by default/setsockopt */
		err = raw_enable_allfilters(dev, sk);
		dev_put(dev);
	} else {
		ifindex = 0;

		/* filters set by default/setsockopt */
		err = raw_enable_allfilters(NULL, sk);
	}

	if (!err) {
		if (ro->bound) {
			/* unregister old filters */
			if (ro->ifindex) {
				struct net_device *dev;

				dev = dev_get_by_index(&init_net, ro->ifindex);
				if (dev) {
					raw_disable_allfilters(dev, sk);
					dev_put(dev);
				}
			} else
				raw_disable_allfilters(NULL, sk);
		}
		ro->ifindex = ifindex;
		ro->bound = 1;
	}

 out:
	release_sock(sk);

	if (notify_enetdown) {
		sk->sk_err = ENETDOWN;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_error_report(sk);
	}

	return err;
}
Exemple #6
0
static int raw_getsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct raw_opt *ro = raw_sk(sk);
	struct can_filter *filter = ro->filter;
	int count = ro->count;
	int len;

	if (level != SOL_CAN_RAW)
		return -EINVAL;

	switch (optname) {

	case CAN_RAW_FILTER:
		if (get_user(len, optlen))
			return -EFAULT;

		if (count && filter) {
			int filter_size = count * sizeof(struct can_filter);
			if (len < filter_size)
				return -EINVAL;
			if (len > filter_size)
				len = filter_size;
			if (copy_to_user(optval, filter, len))
				return -EFAULT;
		} else
			len = 0;

		if (put_user(len, optlen))
			return -EFAULT;

		break;

	case CAN_RAW_ERR_FILTER:
		if (get_user(len, optlen))
			return -EFAULT;

		if (len < sizeof(can_err_mask_t))
			return -EINVAL;

		if (len > sizeof(can_err_mask_t))
			len = sizeof(can_err_mask_t);

		if (copy_to_user(optval, &ro->err_mask, len))
			return -EFAULT;

		if (put_user(len, optlen))
			return -EFAULT;

		break;

	case CAN_RAW_LOOPBACK:
		if (get_user(len, optlen))
			return -EFAULT;

		if (len < sizeof(int))
			return -EINVAL;

		if (len > sizeof(int))
			len = sizeof(int);

		if (copy_to_user(optval, &ro->loopback, len))
			return -EFAULT;

		if (put_user(len, optlen))
			return -EFAULT;

		break;

	case CAN_RAW_RECV_OWN_MSGS:
		if (get_user(len, optlen))
			return -EFAULT;

		if (len < sizeof(int))
			return -EINVAL;

		if (len > sizeof(int))
			len = sizeof(int);

		if (copy_to_user(optval, &ro->recv_own_msgs, len))
			return -EFAULT;

		if (put_user(len, optlen))
			return -EFAULT;

		break;

	default:
		return -ENOPROTOOPT;
	}
	return 0;
}
Exemple #7
0
static int raw_setsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;
	struct raw_opt *ro = raw_sk(sk);
	struct can_filter *filter = NULL;  /* dyn. alloc'ed filters */
	struct can_filter sfilter;         /* single filter */
	struct net_device *dev = NULL;
	can_err_mask_t err_mask = 0;
	int count = 0;
	int err;

	if (level != SOL_CAN_RAW)
		return -EINVAL;

	switch (optname) {

	case CAN_RAW_FILTER:
		if (optlen % sizeof(struct can_filter) != 0)
			return -EINVAL;

		count = optlen / sizeof(struct can_filter);

		if (count > 1) {
			/* filter does not fit into dfilter => alloc space */
			filter = kmalloc(optlen, GFP_KERNEL);
			if (!filter)
				return -ENOMEM;

			err = copy_from_user(filter, optval, optlen);
			if (err) {
				kfree(filter);
				return err;
			}
		} else if (count == 1) {
			err = copy_from_user(&sfilter, optval, optlen);
			if (err)
				return err;
		}

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(ro->ifindex);

		/* remove current filters & unregister */
		if (ro->bound)
			raw_remove_filters(dev, sk);

		if (ro->count > 1)
			kfree(ro->filter);

		if (count == 1) {
			/* copy filter data for single filter */
			ro->dfilter = sfilter;
			filter = &ro->dfilter;
		}

		/* add new filters & register */
		ro->filter = filter;
		ro->count  = count;
		if (ro->bound)
			raw_add_filters(dev, sk);

		if (dev)
			dev_put(dev);

		break;

	case CAN_RAW_ERR_FILTER:
		if (optlen != sizeof(err_mask))
			return -EINVAL;

		err = copy_from_user(&err_mask, optval, optlen);
		if (err)
			return err;

		err_mask &= CAN_ERR_MASK;

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(ro->ifindex);

		/* remove current error mask */
		if (ro->err_mask && ro->bound)
			can_rx_unregister(dev, 0, ro->err_mask | CAN_ERR_FLAG,
					  raw_rcv, sk);

		/* add new error mask */
		ro->err_mask = err_mask;
		if (ro->err_mask && ro->bound)
			can_rx_register(dev, 0, ro->err_mask | CAN_ERR_FLAG,
					raw_rcv, sk, IDENT);

		if (dev)
			dev_put(dev);

		break;

	case CAN_RAW_LOOPBACK:
		if (optlen != sizeof(ro->loopback))
			return -EINVAL;

		err = copy_from_user(&ro->loopback, optval, optlen);
		if (err)
			return err;

		break;

	case CAN_RAW_RECV_OWN_MSGS:
		if (optlen != sizeof(ro->recv_own_msgs))
			return -EINVAL;

		err = copy_from_user(&ro->recv_own_msgs, optval, optlen);
		if (err)
			return err;

		break;

	default:
		return -ENOPROTOOPT;
	}
	return 0;
}
Exemple #8
0
static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
{
	struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
	struct sock *sk = sock->sk;
	struct raw_opt *ro = raw_sk(sk);
	struct net_device *dev;

	DBG("socket %p to device %d\n", sock, addr->can_ifindex);

	if (len < sizeof(*addr))
		return -EINVAL;

	if (ro->bound) {
#ifdef CAN_RAW_SUPPORT_REBIND
		/* remove current bindings / notifier */
		if (ro->ifindex) {
			dev = dev_get_by_index(ro->ifindex);
			if (!dev) {
				DBG("could not find device %d\n",
				    addr->can_ifindex);
				return -ENODEV;
			}
			if (!(dev->flags & IFF_UP)) {
				sk->sk_err = ENETDOWN;
				if (!sock_flag(sk, SOCK_DEAD))
					sk->sk_error_report(sk);
				goto out;
			}
			can_dev_unregister(dev, raw_notifier, sk);
		} else
			dev = NULL;

		/* unregister current filters for this device */
		raw_remove_filters(dev, sk);

		if (dev)
			dev_put(dev);

		ro->bound = 0;
#else
		return -EINVAL;
#endif
	}

	if (addr->can_ifindex) {
		dev = dev_get_by_index(addr->can_ifindex);
		if (!dev) {
			DBG("could not find device %d\n", addr->can_ifindex);
			return -ENODEV;
		}
		if (!(dev->flags & IFF_UP)) {
			sk->sk_err = ENETDOWN;
			if (!sock_flag(sk, SOCK_DEAD))
				sk->sk_error_report(sk);
			goto out;
		}
		can_dev_register(dev, raw_notifier, sk);
	} else
		dev = NULL;

	ro->ifindex = addr->can_ifindex;

	/* filters set by default/setsockopt */
	raw_add_filters(dev, sk);

	/* error frame filter set by setsockopt */
	if (ro->err_mask)
		can_rx_register(dev, 0, ro->err_mask | CAN_ERR_FLAG,
				raw_rcv, sk, IDENT);

	ro->bound = 1;

 out:
	if (dev)
		dev_put(dev);

	return 0;
}
Exemple #9
0
static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
		       struct msghdr *msg, size_t size)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	struct sk_buff *skb;
	struct net_device *dev;
	int ifindex;
	int err;

	if (msg->msg_name) {
		struct sockaddr_can *addr =
			(struct sockaddr_can *)msg->msg_name;

		if (msg->msg_namelen < sizeof(*addr))
			return -EINVAL;

		if (addr->can_family != AF_CAN)
			return -EINVAL;

		ifindex = addr->can_ifindex;
	} else
		ifindex = ro->ifindex;

	if (size != sizeof(struct can_frame))
		return -EINVAL;

	dev = dev_get_by_index(&init_net, ifindex);
	if (!dev)
		return -ENXIO;

	skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
				  &err);
	if (!skb)
		goto put_dev;

	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	if (err < 0)
		goto free_skb;
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
	if (err < 0)
		goto free_skb;

	/* to be able to check the received tx sock reference in raw_rcv() */
	skb_shinfo(skb)->tx_flags |= SKBTX_DRV_NEEDS_SK_REF;

	skb->dev = dev;
	skb->sk  = sk;

	err = can_send(skb, ro->loopback);

	dev_put(dev);

	if (err)
		goto send_failed;

	return size;

free_skb:
	kfree_skb(skb);
put_dev:
	dev_put(dev);
send_failed:
	return err;
}
Exemple #10
0
static void raw_rcv(struct sk_buff *oskb, void *data)
{
	struct sock *sk = (struct sock *)data;
	struct raw_sock *ro = raw_sk(sk);
	struct sockaddr_can *addr;
	struct sk_buff *skb;
	unsigned int *pflags;

	/* check the received tx sock reference */
	if (!ro->recv_own_msgs && oskb->sk == sk)
		return;

	/* do not pass non-CAN2.0 frames to a legacy socket */
	if (!ro->fd_frames && oskb->len != CAN_MTU)
		return;

	/* eliminate multiple filter matches for the same skb */
	if (this_cpu_ptr(ro->uniq)->skb == oskb &&
	    this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
		if (ro->join_filters) {
			this_cpu_inc(ro->uniq->join_rx_count);
			/* drop frame until all enabled filters matched */
			if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count)
				return;
		} else {
			return;
		}
	} else {
		this_cpu_ptr(ro->uniq)->skb = oskb;
		this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
		this_cpu_ptr(ro->uniq)->join_rx_count = 1;
		/* drop first frame to check all enabled filters? */
		if (ro->join_filters && ro->count > 1)
			return;
	}

	/* clone the given skb to be able to enqueue it into the rcv queue */
	skb = skb_clone(oskb, GFP_ATOMIC);
	if (!skb)
		return;

	/*
	 *  Put the datagram to the queue so that raw_recvmsg() can
	 *  get it from there.  We need to pass the interface index to
	 *  raw_recvmsg().  We pass a whole struct sockaddr_can in skb->cb
	 *  containing the interface index.
	 */

	sock_skb_cb_check_size(sizeof(struct sockaddr_can));
	addr = (struct sockaddr_can *)skb->cb;
	memset(addr, 0, sizeof(*addr));
	addr->can_family  = AF_CAN;
	addr->can_ifindex = skb->dev->ifindex;

	/* add CAN specific message flags for raw_recvmsg() */
	pflags = raw_flags(skb);
	*pflags = 0;
	if (oskb->sk)
		*pflags |= MSG_DONTROUTE;
	if (oskb->sk == sk)
		*pflags |= MSG_CONFIRM;

	if (sock_queue_rcv_skb(sk, skb) < 0)
		kfree_skb(skb);
}
static int raw_setsockopt(struct socket *sock, int level, int optname,
			  char __user *optval, unsigned int optlen)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	struct can_filter *filter = NULL;  
	struct can_filter sfilter;         
	struct net_device *dev = NULL;
	can_err_mask_t err_mask = 0;
	int count = 0;
	int err = 0;

	if (level != SOL_CAN_RAW)
		return -EINVAL;

	switch (optname) {

	case CAN_RAW_FILTER:
		if (optlen % sizeof(struct can_filter) != 0)
			return -EINVAL;

		count = optlen / sizeof(struct can_filter);

		if (count > 1) {
			
			filter = memdup_user(optval, optlen);
			if (IS_ERR(filter))
				return PTR_ERR(filter);
		} else if (count == 1) {
			if (copy_from_user(&sfilter, optval, sizeof(sfilter)))
				return -EFAULT;
		}

		lock_sock(sk);

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(&init_net, ro->ifindex);

		if (ro->bound) {
			
			if (count == 1)
				err = raw_enable_filters(dev, sk, &sfilter, 1);
			else
				err = raw_enable_filters(dev, sk, filter,
							 count);
			if (err) {
				if (count > 1)
					kfree(filter);
				goto out_fil;
			}

			
			raw_disable_filters(dev, sk, ro->filter, ro->count);
		}

		
		if (ro->count > 1)
			kfree(ro->filter);

		
		if (count == 1) {
			
			ro->dfilter = sfilter;
			filter = &ro->dfilter;
		}
		ro->filter = filter;
		ro->count  = count;

 out_fil:
		if (dev)
			dev_put(dev);

		release_sock(sk);

		break;

	case CAN_RAW_ERR_FILTER:
		if (optlen != sizeof(err_mask))
			return -EINVAL;

		if (copy_from_user(&err_mask, optval, optlen))
			return -EFAULT;

		err_mask &= CAN_ERR_MASK;

		lock_sock(sk);

		if (ro->bound && ro->ifindex)
			dev = dev_get_by_index(&init_net, ro->ifindex);

		
		if (ro->bound) {
			
			err = raw_enable_errfilter(dev, sk, err_mask);

			if (err)
				goto out_err;

			
			raw_disable_errfilter(dev, sk, ro->err_mask);
		}

		
		ro->err_mask = err_mask;

 out_err:
		if (dev)
			dev_put(dev);

		release_sock(sk);

		break;

	case CAN_RAW_LOOPBACK:
		if (optlen != sizeof(ro->loopback))
			return -EINVAL;

		if (copy_from_user(&ro->loopback, optval, optlen))
			return -EFAULT;

		break;

	case CAN_RAW_RECV_OWN_MSGS:
		if (optlen != sizeof(ro->recv_own_msgs))
			return -EINVAL;

		if (copy_from_user(&ro->recv_own_msgs, optval, optlen))
			return -EFAULT;

		break;

	default:
		return -ENOPROTOOPT;
	}
	return err;
}
Exemple #12
0
static int raw_sendmsg(struct kiocb *iocb, struct socket *sock,
		       struct msghdr *msg, size_t size)
{
	struct sock *sk = sock->sk;
	struct raw_sock *ro = raw_sk(sk);
	struct sk_buff *skb;
	struct net_device *dev;
	int ifindex;
	int err;

	if (msg->msg_name) {
		struct sockaddr_can *addr =
			(struct sockaddr_can *)msg->msg_name;

		if (msg->msg_namelen < sizeof(*addr))
			return -EINVAL;

		if (addr->can_family != AF_CAN)
			return -EINVAL;

		ifindex = addr->can_ifindex;
	} else
		ifindex = ro->ifindex;

	if (ro->fd_frames) {
		if (unlikely(size != CANFD_MTU && size != CAN_MTU))
			return -EINVAL;
	} else {
		if (unlikely(size != CAN_MTU))
			return -EINVAL;
	}

	dev = dev_get_by_index(&init_net, ifindex);
	if (!dev)
		return -ENXIO;

	skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
				  msg->msg_flags & MSG_DONTWAIT, &err);
	if (!skb)
		goto put_dev;

	can_skb_reserve(skb);
	can_skb_prv(skb)->ifindex = dev->ifindex;

	err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
	if (err < 0)
		goto free_skb;
	err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
	if (err < 0)
		goto free_skb;

	skb->dev = dev;
	skb->sk  = sk;

	err = can_send(skb, ro->loopback);

	dev_put(dev);

	if (err)
		goto send_failed;

	return size;

free_skb:
	kfree_skb(skb);
put_dev:
	dev_put(dev);
send_failed:
	return err;
}