/**
 * filter_rcv - validate incoming message
 * @sk: socket
 * @buf: message
 *
 * Enqueues message on receive queue if acceptable; optionally handles
 * disconnect indication for a connected socket.
 *
 * Called with socket lock already taken; port lock may also be taken.
 *
 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
 */
static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
{
	struct socket *sock = sk->sk_socket;
	struct tipc_msg *msg = buf_msg(buf);
	unsigned int limit = rcvbuf_limit(sk, buf);
	u32 res = TIPC_OK;

	/* Reject message if it is wrong sort of message for socket */
	if (msg_type(msg) > TIPC_DIRECT_MSG)
		return TIPC_ERR_NO_PORT;

	if (sock->state == SS_READY) {
		if (msg_connected(msg))
			return TIPC_ERR_NO_PORT;
	} else {
		res = filter_connect(tipc_sk(sk), &buf);
		if (res != TIPC_OK || buf == NULL)
			return res;
	}

	/* Reject message if there isn't room to queue it */
	if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
		return TIPC_ERR_OVERLOAD;

	/* Enqueue message */
	TIPC_SKB_CB(buf)->handle = 0;
	__skb_queue_tail(&sk->sk_receive_queue, buf);
	skb_set_owner_r(buf, sk);

	sk->sk_data_ready(sk, 0);
	return TIPC_OK;
}
Beispiel #2
0
/**
 * tipc_create - create a TIPC socket
 * @sock: pre-allocated socket structure
 * @protocol: protocol indicator (must be 0)
 *
 * This routine creates and attaches a 'struct sock' to the 'struct socket',
 * then create and attaches a TIPC port to the 'struct sock' part.
 *
 * Returns 0 on success, errno otherwise
 */
static int tipc_create(struct socket *sock, int protocol)
{
	struct tipc_sock *tsock;
	struct tipc_port *port;
	struct sock *sk;
	u32 ref;

	if (unlikely(protocol != 0))
		return -EPROTONOSUPPORT;

	ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
	if (unlikely(!ref))
		return -ENOMEM;

	sock->state = SS_UNCONNECTED;

	switch (sock->type) {
	case SOCK_STREAM:
		sock->ops = &stream_ops;
		break;
	case SOCK_SEQPACKET:
		sock->ops = &packet_ops;
		break;
	case SOCK_DGRAM:
		tipc_set_portunreliable(ref, 1);
		/* fall through */
	case SOCK_RDM:
		tipc_set_portunreturnable(ref, 1);
		sock->ops = &msg_ops;
		sock->state = SS_READY;
		break;
	default:
		tipc_deleteport(ref);
		return -EPROTOTYPE;
	}

	sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1);
	if (!sk) {
		tipc_deleteport(ref);
		return -ENOMEM;
	}

	sock_init_data(sock, sk);
	init_waitqueue_head(sk->sk_sleep);
	sk->sk_rcvtimeo = 8 * HZ;   /* default connect timeout = 8s */

	tsock = tipc_sk(sk);
	port = tipc_get_port(ref);

	tsock->p = port;
	port->usr_handle = tsock;

	init_MUTEX(&tsock->sem);

	dbg("sock_create: %x\n",tsock);

	atomic_inc(&tipc_user_count);

	return 0;
}
Beispiel #3
0
static int get_name(struct socket *sock, struct sockaddr *uaddr,
		    int *uaddr_len, int peer)
{
	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
	struct tipc_sock *tsock = tipc_sk(sock->sk);

	memset(addr, 0, sizeof(*addr));
	if (peer) {
		if ((sock->state != SS_CONNECTED) &&
			((peer != 2) || (sock->state != SS_DISCONNECTING)))
			return -ENOTCONN;
		addr->addr.id.ref = tsock->peer_name.ref;
		addr->addr.id.node = tsock->peer_name.node;
	} else {
		addr->addr.id.ref = tsock->p->ref;
		addr->addr.id.node = tipc_own_addr;
	}

	*uaddr_len = sizeof(*addr);
	addr->addrtype = TIPC_ADDR_ID;
	addr->family = AF_TIPC;
	addr->scope = 0;
	addr->addr.name.domain = 0;

	return 0;
}
Beispiel #4
0
static int getsockopt(struct socket *sock,
		      int lvl, int opt, char __user *ov, int __user *ol)
{
	struct sock *sk = sock->sk;
	struct tipc_port *tport = tipc_sk_port(sk);
	int len;
	u32 value;
	int res;

	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
		return put_user(0, ol);
	if (lvl != SOL_TIPC)
		return -ENOPROTOOPT;
	if ((res = get_user(len, ol)))
		return res;

	lock_sock(sk);

	switch (opt) {
	case TIPC_IMPORTANCE:
		res = tipc_portimportance(tport->ref, &value);
		break;
	case TIPC_SRC_DROPPABLE:
		res = tipc_portunreliable(tport->ref, &value);
		break;
	case TIPC_DEST_DROPPABLE:
		res = tipc_portunreturnable(tport->ref, &value);
		break;
	case TIPC_CONN_TIMEOUT:
		value = jiffies_to_msecs(tipc_sk(sk)->conn_timeout);
		/* no need to set "res", since already 0 at this point */
		break;
	 case TIPC_NODE_RECVQ_DEPTH:
		value = (u32)atomic_read(&tipc_queue_size);
		break;
	 case TIPC_SOCK_RECVQ_DEPTH:
		value = skb_queue_len(&sk->sk_receive_queue);
		break;
	default:
		res = -EINVAL;
	}

	release_sock(sk);

	if (res) {
		/* "get" failed */
	}
	else if (len < sizeof(value)) {
		res = -EINVAL;
	}
	else if (copy_to_user(ov, &value, sizeof(value))) {
		res = -EFAULT;
	}
	else {
		res = put_user(sizeof(value), ol);
	}

	return res;
}
Beispiel #5
0
static int release(struct socket *sock)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sock *sk = sock->sk;
	int res = TIPC_OK;
	struct sk_buff *buf;

	dbg("sock_delete: %x\n",tsock);
	if (!tsock)
		return 0;
	down_interruptible(&tsock->sem);
	if (!sock->sk) {
		up(&tsock->sem);
		return 0;
	}

	/* Reject unreceived messages, unless no longer connected */

	while (sock->state != SS_DISCONNECTING) {
		sock_lock(tsock);
		buf = skb_dequeue(&sk->sk_receive_queue);
		if (!buf)
			tsock->p->usr_handle = NULL;
		sock_unlock(tsock);
		if (!buf)
			break;
		if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
			buf_discard(buf);
		else
			tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
		atomic_dec(&tipc_queue_size);
	}

	/* Delete TIPC port */

	res = tipc_deleteport(tsock->p->ref);
	sock->sk = NULL;

	/* Discard any remaining messages */

	while ((buf = skb_dequeue(&sk->sk_receive_queue))) {
		buf_discard(buf);
		atomic_dec(&tipc_queue_size);
	}

	up(&tsock->sem);

	sock_put(sk);

	atomic_dec(&tipc_user_count);
	return res;
}
Beispiel #6
0
static int getsockopt(struct socket *sock,
		      int lvl, int opt, char __user *ov, int __user *ol)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	int len;
	u32 value;
	int res;

	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
		return put_user(0, ol);
	if (lvl != SOL_TIPC)
		return -ENOPROTOOPT;
	if ((res = get_user(len, ol)))
		return res;

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	switch (opt) {
	case TIPC_IMPORTANCE:
		res = tipc_portimportance(tsock->p->ref, &value);
		break;
	case TIPC_SRC_DROPPABLE:
		res = tipc_portunreliable(tsock->p->ref, &value);
		break;
	case TIPC_DEST_DROPPABLE:
		res = tipc_portunreturnable(tsock->p->ref, &value);
		break;
	case TIPC_CONN_TIMEOUT:
		value = (sock->sk->sk_rcvtimeo * 1000) / HZ;
		break;
	default:
		res = -EINVAL;
	}

	if (res) {
		/* "get" failed */
	}
	else if (len < sizeof(value)) {
		res = -EINVAL;
	}
	else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
		/* couldn't return value */
	}
	else {
		res = put_user(sizeof(value), ol);
	}

	up(&tsock->sem);
	return res;
}
Beispiel #7
0
static int auto_connect(struct socket *sock, struct tipc_msg *msg)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);

	if (msg_errcode(msg)) {
		sock->state = SS_DISCONNECTING;
		return -ECONNREFUSED;
	}

	tsock->peer_name.ref = msg_origport(msg);
	tsock->peer_name.node = msg_orignode(msg);
	tipc_connect2port(tsock->p->ref, &tsock->peer_name);
	tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
	sock->state = SS_CONNECTED;
	return 0;
}
Beispiel #8
0
static int setsockopt(struct socket *sock,
		      int lvl, int opt, char __user *ov, unsigned int ol)
{
	struct sock *sk = sock->sk;
	struct tipc_port *tport = tipc_sk_port(sk);
	u32 value;
	int res;

	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
		return 0;
	if (lvl != SOL_TIPC)
		return -ENOPROTOOPT;
	if (ol < sizeof(value))
		return -EINVAL;
	res = get_user(value, (u32 __user *)ov);
	if (res)
		return res;

	lock_sock(sk);

	switch (opt) {
	case TIPC_IMPORTANCE:
		res = tipc_set_portimportance(tport->ref, value);
		break;
	case TIPC_SRC_DROPPABLE:
		if (sock->type != SOCK_STREAM)
			res = tipc_set_portunreliable(tport->ref, value);
		else
			res = -ENOPROTOOPT;
		break;
	case TIPC_DEST_DROPPABLE:
		res = tipc_set_portunreturnable(tport->ref, value);
		break;
	case TIPC_CONN_TIMEOUT:
		tipc_sk(sk)->conn_timeout = value;
		/* no need to set "res", since already 0 at this point */
		break;
	default:
		res = -EINVAL;
	}

	release_sock(sk);

	return res;
}
/**
 * auto_connect - complete connection setup to a remote port
 * @sock: socket structure
 * @msg: peer's response message
 *
 * Returns 0 on success, errno otherwise
 */
static int auto_connect(struct socket *sock, struct tipc_msg *msg)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct tipc_port *p_ptr;

	tsock->peer_name.ref = msg_origport(msg);
	tsock->peer_name.node = msg_orignode(msg);
	p_ptr = tipc_port_deref(tsock->p->ref);
	if (!p_ptr)
		return -EINVAL;

	__tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name);

	if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
		return -EINVAL;
	msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
	sock->state = SS_CONNECTED;
	return 0;
}
Beispiel #10
0
static int setsockopt(struct socket *sock,
		      int lvl, int opt, char __user *ov, int ol)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	u32 value;
	int res;

	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
		return 0;
	if (lvl != SOL_TIPC)
		return -ENOPROTOOPT;
	if (ol < sizeof(value))
		return -EINVAL;
	if ((res = get_user(value, (u32 __user *)ov)))
		return res;

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	switch (opt) {
	case TIPC_IMPORTANCE:
		res = tipc_set_portimportance(tsock->p->ref, value);
		break;
	case TIPC_SRC_DROPPABLE:
		if (sock->type != SOCK_STREAM)
			res = tipc_set_portunreliable(tsock->p->ref, value);
		else
			res = -ENOPROTOOPT;
		break;
	case TIPC_DEST_DROPPABLE:
		res = tipc_set_portunreturnable(tsock->p->ref, value);
		break;
	case TIPC_CONN_TIMEOUT:
		sock->sk->sk_rcvtimeo = (value * HZ / 1000);
		break;
	default:
		res = -EINVAL;
	}

	up(&tsock->sem);
	return res;
}
Beispiel #11
0
static int send_packet(struct kiocb *iocb, struct socket *sock,
		       struct msghdr *m, size_t total_len)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
	int res;

	/* Handle implied connection establishment */

	if (unlikely(dest))
		return send_msg(iocb, sock, m, total_len);

	if (down_interruptible(&tsock->sem)) {
		return -ERESTARTSYS;
	}

	do {
		if (unlikely(sock->state != SS_CONNECTED)) {
			if (sock->state == SS_DISCONNECTING)
				res = -EPIPE;
			else
				res = -ENOTCONN;
			goto exit;
		}

		res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov);
		if (likely(res != -ELINKCONG)) {
exit:
			up(&tsock->sem);
			return res;
		}
		if (m->msg_flags & MSG_DONTWAIT) {
			res = -EWOULDBLOCK;
			goto exit;
		}
		if (wait_event_interruptible(*sock->sk->sk_sleep,
					     !tsock->p->congested)) {
		    res = -ERESTARTSYS;
		    goto exit;
		}
	} while (1);
}
Beispiel #12
0
static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
	int res;

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	if (unlikely(!uaddr_len)) {
		res = tipc_withdraw(tsock->p->ref, 0, NULL);
		goto exit;
	}

	if (uaddr_len < sizeof(struct sockaddr_tipc)) {
		res = -EINVAL;
		goto exit;
	}

	if (addr->family != AF_TIPC) {
		res = -EAFNOSUPPORT;
		goto exit;
	}
	if (addr->addrtype == TIPC_ADDR_NAME)
		addr->addr.nameseq.upper = addr->addr.nameseq.lower;
	else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
		res = -EAFNOSUPPORT;
		goto exit;
	}

	if (addr->scope > 0)
		res = tipc_publish(tsock->p->ref, addr->scope,
				   &addr->addr.nameseq);
	else
		res = tipc_withdraw(tsock->p->ref, -addr->scope,
				    &addr->addr.nameseq);
exit:
	up(&tsock->sem);
	return res;
}
Beispiel #13
0
static int get_name(struct socket *sock, struct sockaddr *uaddr,
		    int *uaddr_len, int peer)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
	u32 res;

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	*uaddr_len = sizeof(*addr);
	addr->addrtype = TIPC_ADDR_ID;
	addr->family = AF_TIPC;
	addr->scope = 0;
	if (peer)
		res = tipc_peer(tsock->p->ref, &addr->addr.id);
	else
		res = tipc_ownidentity(tsock->p->ref, &addr->addr.id);
	addr->addr.name.domain = 0;

	up(&tsock->sem);
	return res;
}
static int connect(struct socket *sock, struct sockaddr *dest, int destlen, 
		   int flags)
{
   struct tipc_sock *tsock = tipc_sk(sock->sk);
   struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
   struct msghdr m = {0,};
   struct sk_buff *buf;
   struct tipc_msg *msg;
   int res;

   /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */

   if (sock->state == SS_READY)
	   return -EOPNOTSUPP;

   /* MOVE THE REST OF THIS ERROR CHECKING TO send_msg()? */
   if (sock->state == SS_LISTENING)
	   return -EOPNOTSUPP;
   if (sock->state == SS_CONNECTING)
	   return -EALREADY;
   if (sock->state != SS_UNCONNECTED)
           return -EISCONN;

   if ((dst->family != AF_TIPC) ||
       ((dst->addrtype != TIPC_ADDR_NAME) && (dst->addrtype != TIPC_ADDR_ID)))
           return -EINVAL;

   /* Send a 'SYN-' to destination */

   m.msg_name = dest;
   if ((res = send_msg(0, sock, &m, 0)) < 0) {
	   sock->state = SS_DISCONNECTING;
	   return res;
   }

   if (down_interruptible(&tsock->sem)) 
           return -ERESTARTSYS;
	
   /* Wait for destination's 'ACK' response */

   res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
                                          skb_queue_len(&sock->sk->sk_receive_queue),
					  sock->sk->sk_rcvtimeo);
   buf = skb_peek(&sock->sk->sk_receive_queue);
   if (res > 0) {
	   msg = buf_msg(buf);
           res = auto_connect(sock, tsock, msg);
           if (!res) {
		   if (dst->addrtype == TIPC_ADDR_NAME) {
			   tsock->p->conn_type = dst->addr.name.name.type;
			   tsock->p->conn_instance = dst->addr.name.name.instance;
		   }
		   if (!msg_data_sz(msg))
			   advance_queue(tsock);
	   }
   } else {
	   if (res == 0) {
		   res = -ETIMEDOUT;
	   } else
	           { /* leave "res" unchanged */ }
	   sock->state = SS_DISCONNECTING;
   }

   up(&tsock->sem);
   return res;
}
Beispiel #15
0
static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
		   int flags)
{
   struct tipc_sock *tsock = tipc_sk(sock->sk);
   struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
   struct msghdr m = {NULL,};
   struct sk_buff *buf;
   struct tipc_msg *msg;
   int res;

   /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */

   if (sock->state == SS_READY)
	   return -EOPNOTSUPP;

   /* Issue Posix-compliant error code if socket is in the wrong state */

   if (sock->state == SS_LISTENING)
	   return -EOPNOTSUPP;
   if (sock->state == SS_CONNECTING)
	   return -EALREADY;
   if (sock->state != SS_UNCONNECTED)
	   return -EISCONN;

   /*
    * Reject connection attempt using multicast address
    *
    * Note: send_msg() validates the rest of the address fields,
    *       so there's no need to do it here
    */

   if (dst->addrtype == TIPC_ADDR_MCAST)
	   return -EINVAL;

   /* Send a 'SYN-' to destination */

   m.msg_name = dest;
   m.msg_namelen = destlen;
   if ((res = send_msg(NULL, sock, &m, 0)) < 0) {
	   sock->state = SS_DISCONNECTING;
	   return res;
   }

   if (down_interruptible(&tsock->sem))
	   return -ERESTARTSYS;

   /* Wait for destination's 'ACK' response */

   res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
					  skb_queue_len(&sock->sk->sk_receive_queue),
					  sock->sk->sk_rcvtimeo);
   buf = skb_peek(&sock->sk->sk_receive_queue);
   if (res > 0) {
	   msg = buf_msg(buf);
	   res = auto_connect(sock, tsock, msg);
	   if (!res) {
		   if (!msg_data_sz(msg))
			   advance_queue(tsock);
	   }
   } else {
	   if (res == 0) {
		   res = -ETIMEDOUT;
	   } else
		   { /* leave "res" unchanged */ }
	   sock->state = SS_DISCONNECTING;
   }

   up(&tsock->sem);
   return res;
}
Beispiel #16
0
static int tipc_create(struct net *net, struct socket *sock, int protocol,
		       int kern)
{
	const struct proto_ops *ops;
	socket_state state;
	struct sock *sk;
	struct tipc_port *tp_ptr;

	/* Validate arguments */

	if (unlikely(protocol != 0))
		return -EPROTONOSUPPORT;

	switch (sock->type) {
	case SOCK_STREAM:
		ops = &stream_ops;
		state = SS_UNCONNECTED;
		break;
	case SOCK_SEQPACKET:
		ops = &packet_ops;
		state = SS_UNCONNECTED;
		break;
	case SOCK_DGRAM:
	case SOCK_RDM:
		ops = &msg_ops;
		state = SS_READY;
		break;
	default:
		return -EPROTOTYPE;
	}

	/* Allocate socket's protocol area */

	sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
	if (sk == NULL)
		return -ENOMEM;

	/* Allocate TIPC port for socket to use */

	tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
				     TIPC_LOW_IMPORTANCE);
	if (unlikely(!tp_ptr)) {
		sk_free(sk);
		return -ENOMEM;
	}

	/* Finish initializing socket data structures */

	sock->ops = ops;
	sock->state = state;

	sock_init_data(sock, sk);
	sk->sk_backlog_rcv = backlog_rcv;
	tipc_sk(sk)->p = tp_ptr;
	tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;

	spin_unlock_bh(tp_ptr->lock);

	if (sock->state == SS_READY) {
		tipc_set_portunreturnable(tp_ptr->ref, 1);
		if (sock->type == SOCK_DGRAM)
			tipc_set_portunreliable(tp_ptr->ref, 1);
	}

	return 0;
}
Beispiel #17
0
static int accept(struct socket *sock, struct socket *newsock, int flags)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sk_buff *buf;
	int res = -EFAULT;

	if (sock->state == SS_READY)
		return -EOPNOTSUPP;
	if (sock->state != SS_LISTENING)
		return -EINVAL;

	if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
		     (flags & O_NONBLOCK)))
		return -EWOULDBLOCK;

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	if (wait_event_interruptible(*sock->sk->sk_sleep,
				     skb_queue_len(&sock->sk->sk_receive_queue))) {
		res = -ERESTARTSYS;
		goto exit;
	}
	buf = skb_peek(&sock->sk->sk_receive_queue);

	res = tipc_create(newsock, 0);
	if (!res) {
		struct tipc_sock *new_tsock = tipc_sk(newsock->sk);
		struct tipc_portid id;
		struct tipc_msg *msg = buf_msg(buf);
		u32 new_ref = new_tsock->p->ref;

		id.ref = msg_origport(msg);
		id.node = msg_orignode(msg);
		tipc_connect2port(new_ref, &id);
		newsock->state = SS_CONNECTED;

		tipc_set_portimportance(new_ref, msg_importance(msg));
		if (msg_named(msg)) {
			new_tsock->p->conn_type = msg_nametype(msg);
			new_tsock->p->conn_instance = msg_nameinst(msg);
		}

	       /*
		 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
		 * Respond to 'SYN+' by queuing it on new socket.
		 */

		msg_dbg(msg,"<ACC<: ");
		if (!msg_data_sz(msg)) {
			struct msghdr m = {NULL,};

			send_packet(NULL, newsock, &m, 0);
			advance_queue(tsock);
		} else {
			sock_lock(tsock);
			skb_dequeue(&sock->sk->sk_receive_queue);
			sock_unlock(tsock);
			skb_queue_head(&newsock->sk->sk_receive_queue, buf);
		}
	}
exit:
	up(&tsock->sem);
	return res;
}
Beispiel #18
0
static int accept(struct socket *sock, struct socket *new_sock, int flags)
{
	struct sock *sk = sock->sk;
	struct sk_buff *buf;
	int res;

	lock_sock(sk);

	if (sock->state != SS_LISTENING) {
		res = -EINVAL;
		goto exit;
	}

	while (skb_queue_empty(&sk->sk_receive_queue)) {
		if (flags & O_NONBLOCK) {
			res = -EWOULDBLOCK;
			goto exit;
		}
		release_sock(sk);
		res = wait_event_interruptible(*sk_sleep(sk),
				(!skb_queue_empty(&sk->sk_receive_queue)));
		lock_sock(sk);
		if (res)
			goto exit;
	}

	buf = skb_peek(&sk->sk_receive_queue);

	res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
	if (!res) {
		struct sock *new_sk = new_sock->sk;
		struct tipc_sock *new_tsock = tipc_sk(new_sk);
		struct tipc_port *new_tport = new_tsock->p;
		u32 new_ref = new_tport->ref;
		struct tipc_msg *msg = buf_msg(buf);

		lock_sock(new_sk);

		/*
		 * Reject any stray messages received by new socket
		 * before the socket lock was taken (very, very unlikely)
		 */

		reject_rx_queue(new_sk);

		/* Connect new socket to it's peer */

		new_tsock->peer_name.ref = msg_origport(msg);
		new_tsock->peer_name.node = msg_orignode(msg);
		tipc_connect2port(new_ref, &new_tsock->peer_name);
		new_sock->state = SS_CONNECTED;

		tipc_set_portimportance(new_ref, msg_importance(msg));
		if (msg_named(msg)) {
			new_tport->conn_type = msg_nametype(msg);
			new_tport->conn_instance = msg_nameinst(msg);
		}

		/*
		 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
		 * Respond to 'SYN+' by queuing it on new socket.
		 */

		if (!msg_data_sz(msg)) {
			struct msghdr m = {NULL,};

			advance_rx_queue(sk);
			send_packet(NULL, new_sock, &m, 0);
		} else {
			__skb_dequeue(&sk->sk_receive_queue);
			__skb_queue_head(&new_sk->sk_receive_queue, buf);
		}
		release_sock(new_sk);
	}
exit:
	release_sock(sk);
	return res;
}
Beispiel #19
0
static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
		   int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
	struct msghdr m = {NULL,};
	struct sk_buff *buf;
	struct tipc_msg *msg;
	unsigned int timeout;
	int res;

	lock_sock(sk);

	/* For now, TIPC does not allow use of connect() with DGRAM/RDM types */

	if (sock->state == SS_READY) {
		res = -EOPNOTSUPP;
		goto exit;
	}

	/* For now, TIPC does not support the non-blocking form of connect() */

	if (flags & O_NONBLOCK) {
		res = -EOPNOTSUPP;
		goto exit;
	}

	/* Issue Posix-compliant error code if socket is in the wrong state */

	if (sock->state == SS_LISTENING) {
		res = -EOPNOTSUPP;
		goto exit;
	}
	if (sock->state == SS_CONNECTING) {
		res = -EALREADY;
		goto exit;
	}
	if (sock->state != SS_UNCONNECTED) {
		res = -EISCONN;
		goto exit;
	}

	/*
	 * Reject connection attempt using multicast address
	 *
	 * Note: send_msg() validates the rest of the address fields,
	 *       so there's no need to do it here
	 */

	if (dst->addrtype == TIPC_ADDR_MCAST) {
		res = -EINVAL;
		goto exit;
	}

	/* Reject any messages already in receive queue (very unlikely) */

	reject_rx_queue(sk);

	/* Send a 'SYN-' to destination */

	m.msg_name = dest;
	m.msg_namelen = destlen;
	res = send_msg(NULL, sock, &m, 0);
	if (res < 0)
		goto exit;

	/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */

	timeout = tipc_sk(sk)->conn_timeout;
	release_sock(sk);
	res = wait_event_interruptible_timeout(*sk_sleep(sk),
			(!skb_queue_empty(&sk->sk_receive_queue) ||
			(sock->state != SS_CONNECTING)),
			timeout ? (long)msecs_to_jiffies(timeout)
				: MAX_SCHEDULE_TIMEOUT);
	lock_sock(sk);

	if (res > 0) {
		buf = skb_peek(&sk->sk_receive_queue);
		if (buf != NULL) {
			msg = buf_msg(buf);
			res = auto_connect(sock, msg);
			if (!res) {
				if (!msg_data_sz(msg))
					advance_rx_queue(sk);
			}
		} else {
			if (sock->state == SS_CONNECTED)
				res = -EISCONN;
			else
				res = -ECONNREFUSED;
		}
	} else {
		if (res == 0)
			res = -ETIMEDOUT;
		else
			; /* leave "res" unchanged */
		sock->state = SS_DISCONNECTING;
	}

exit:
	release_sock(sk);
	return res;
}
Beispiel #20
0
static int shutdown(struct socket *sock, int how)
{
	struct tipc_sock* tsock = tipc_sk(sock->sk);
	struct sk_buff *buf;
	int res;

	/* Could return -EINVAL for an invalid "how", but why bother? */

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	sock_lock(tsock);

	switch (sock->state) {
	case SS_CONNECTED:

		/* Send 'FIN+' or 'FIN-' message to peer */

		sock_unlock(tsock);
restart:
		if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
			atomic_dec(&tipc_queue_size);
			if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
				buf_discard(buf);
				goto restart;
			}
			tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
		}
		else {
			tipc_shutdown(tsock->p->ref);
		}
		sock_lock(tsock);

		/* fall through */

	case SS_DISCONNECTING:

		/* Discard any unreceived messages */

		while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
			atomic_dec(&tipc_queue_size);
			buf_discard(buf);
		}
		tsock->p->conn_unacked = 0;

		/* fall through */

	case SS_CONNECTING:
		sock->state = SS_DISCONNECTING;
		res = 0;
		break;

	default:
		res = -ENOTCONN;
	}

	sock_unlock(tsock);

	up(&tsock->sem);
	return res;
}
/**
 * connect - establish a connection to another TIPC port
 * @sock: socket structure
 * @dest: socket address for destination port
 * @destlen: size of socket address data structure
 * @flags: file-related flags associated with socket
 *
 * Returns 0 on success, errno otherwise
 */
static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
		   int flags)
{
	struct sock *sk = sock->sk;
	struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
	struct msghdr m = {NULL,};
	unsigned int timeout;
	int res;

	lock_sock(sk);

	/* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
	if (sock->state == SS_READY) {
		res = -EOPNOTSUPP;
		goto exit;
	}

	/*
	 * Reject connection attempt using multicast address
	 *
	 * Note: send_msg() validates the rest of the address fields,
	 *       so there's no need to do it here
	 */
	if (dst->addrtype == TIPC_ADDR_MCAST) {
		res = -EINVAL;
		goto exit;
	}

	timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;

	switch (sock->state) {
	case SS_UNCONNECTED:
		/* Send a 'SYN-' to destination */
		m.msg_name = dest;
		m.msg_namelen = destlen;

		/* If connect is in non-blocking case, set MSG_DONTWAIT to
		 * indicate send_msg() is never blocked.
		 */
		if (!timeout)
			m.msg_flags = MSG_DONTWAIT;

		res = send_msg(NULL, sock, &m, 0);
		if ((res < 0) && (res != -EWOULDBLOCK))
			goto exit;

		/* Just entered SS_CONNECTING state; the only
		 * difference is that return value in non-blocking
		 * case is EINPROGRESS, rather than EALREADY.
		 */
		res = -EINPROGRESS;
		break;
	case SS_CONNECTING:
		res = -EALREADY;
		break;
	case SS_CONNECTED:
		res = -EISCONN;
		break;
	default:
		res = -EINVAL;
		goto exit;
	}

	if (sock->state == SS_CONNECTING) {
		if (!timeout)
			goto exit;

		/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
		release_sock(sk);
		res = wait_event_interruptible_timeout(*sk_sleep(sk),
				sock->state != SS_CONNECTING,
				timeout ? (long)msecs_to_jiffies(timeout)
					: MAX_SCHEDULE_TIMEOUT);
		lock_sock(sk);
		if (res <= 0) {
			if (res == 0)
				res = -ETIMEDOUT;
			else
				; /* leave "res" unchanged */
			goto exit;
		}
	}

	if (unlikely(sock->state == SS_DISCONNECTING))
		res = sock_error(sk);
	else
		res = 0;

exit:
	release_sock(sk);
	return res;
}
Beispiel #22
0
static int recv_stream(struct kiocb *iocb, struct socket *sock,
		       struct msghdr *m, size_t buf_len, int flags)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sk_buff *buf;
	struct tipc_msg *msg;
	unsigned int q_len;
	unsigned int sz;
	int sz_to_copy;
	int sz_copied = 0;
	int needed;
	char __user *crs = m->msg_iov->iov_base;
	unsigned char *buf_crs;
	u32 err;
	int res;

	/* Currently doesn't support receiving into multiple iovec entries */

	if (m->msg_iovlen != 1)
		return -EOPNOTSUPP;

	/* Catch invalid receive attempts */

	if (unlikely(!buf_len))
		return -EINVAL;

	if (unlikely(sock->state == SS_DISCONNECTING)) {
		if (skb_queue_len(&sock->sk->sk_receive_queue) == 0)
			return -ENOTCONN;
	} else if (unlikely(sock->state != SS_CONNECTED))
		return -ENOTCONN;

	/* Look for a message in receive queue; wait if necessary */

	if (unlikely(down_interruptible(&tsock->sem)))
		return -ERESTARTSYS;

restart:
	if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
		     (flags & MSG_DONTWAIT))) {
		res = -EWOULDBLOCK;
		goto exit;
	}

	if ((res = wait_event_interruptible(
		*sock->sk->sk_sleep,
		((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
		 (sock->state == SS_DISCONNECTING))) )) {
		goto exit;
	}

	/* Catch attempt to receive on an already terminated connection */
	/* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */

	if (!q_len) {
		res = -ENOTCONN;
		goto exit;
	}

	/* Get access to first message in receive queue */

	buf = skb_peek(&sock->sk->sk_receive_queue);
	msg = buf_msg(buf);
	sz = msg_data_sz(msg);
	err = msg_errcode(msg);

	/* Discard an empty non-errored message & try again */

	if ((!sz) && (!err)) {
		advance_queue(tsock);
		goto restart;
	}

	/* Optionally capture sender's address & ancillary data of first msg */

	if (sz_copied == 0) {
		set_orig_addr(m, msg);
		if ((res = anc_data_recv(m, msg, tsock->p)))
			goto exit;
	}

	/* Capture message data (if valid) & compute return value (always) */

	if (!err) {
		buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
		sz = skb_tail_pointer(buf) - buf_crs;

		needed = (buf_len - sz_copied);
		sz_to_copy = (sz <= needed) ? sz : needed;
		if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
			res = -EFAULT;
			goto exit;
		}
		sz_copied += sz_to_copy;

		if (sz_to_copy < sz) {
			if (!(flags & MSG_PEEK))
				TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
			goto exit;
		}

		crs += sz_to_copy;
	} else {
		if (sz_copied != 0)
			goto exit; /* can't add error msg to valid data */

		if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
			res = 0;
		else
			res = -ECONNRESET;
	}

	/* Consume received message (optional) */

	if (likely(!(flags & MSG_PEEK))) {
		if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
			tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
		advance_queue(tsock);
	}

	/* Loop around if more data is required */

	if ((sz_copied < buf_len)    /* didn't get all requested data */
	    && (flags & MSG_WAITALL) /* ... and need to wait for more */
	    && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
	    && (!err)                /* ... and haven't reached a FIN */
	    )
		goto restart;

exit:
	up(&tsock->sem);
	return sz_copied ? sz_copied : res;
}
Beispiel #23
0
static int recv_msg(struct kiocb *iocb, struct socket *sock,
		    struct msghdr *m, size_t buf_len, int flags)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sk_buff *buf;
	struct tipc_msg *msg;
	unsigned int q_len;
	unsigned int sz;
	u32 err;
	int res;

	/* Currently doesn't support receiving into multiple iovec entries */

	if (m->msg_iovlen != 1)
		return -EOPNOTSUPP;

	/* Catch invalid receive attempts */

	if (unlikely(!buf_len))
		return -EINVAL;

	if (sock->type == SOCK_SEQPACKET) {
		if (unlikely(sock->state == SS_UNCONNECTED))
			return -ENOTCONN;
		if (unlikely((sock->state == SS_DISCONNECTING) &&
			     (skb_queue_len(&sock->sk->sk_receive_queue) == 0)))
			return -ENOTCONN;
	}

	/* Look for a message in receive queue; wait if necessary */

	if (unlikely(down_interruptible(&tsock->sem)))
		return -ERESTARTSYS;

restart:
	if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
		     (flags & MSG_DONTWAIT))) {
		res = -EWOULDBLOCK;
		goto exit;
	}

	if ((res = wait_event_interruptible(
		*sock->sk->sk_sleep,
		((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
		 (sock->state == SS_DISCONNECTING))) )) {
		goto exit;
	}

	/* Catch attempt to receive on an already terminated connection */
	/* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */

	if (!q_len) {
		res = -ENOTCONN;
		goto exit;
	}

	/* Get access to first message in receive queue */

	buf = skb_peek(&sock->sk->sk_receive_queue);
	msg = buf_msg(buf);
	sz = msg_data_sz(msg);
	err = msg_errcode(msg);

	/* Complete connection setup for an implied connect */

	if (unlikely(sock->state == SS_CONNECTING)) {
		if ((res = auto_connect(sock, tsock, msg)))
			goto exit;
	}

	/* Discard an empty non-errored message & try again */

	if ((!sz) && (!err)) {
		advance_queue(tsock);
		goto restart;
	}

	/* Capture sender's address (optional) */

	set_orig_addr(m, msg);

	/* Capture ancillary data (optional) */

	if ((res = anc_data_recv(m, msg, tsock->p)))
		goto exit;

	/* Capture message data (if valid) & compute return value (always) */

	if (!err) {
		if (unlikely(buf_len < sz)) {
			sz = buf_len;
			m->msg_flags |= MSG_TRUNC;
		}
		if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
					  sz))) {
			res = -EFAULT;
			goto exit;
		}
		res = sz;
	} else {
		if ((sock->state == SS_READY) ||
		    ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
			res = 0;
		else
			res = -ECONNRESET;
	}

	/* Consume received message (optional) */

	if (likely(!(flags & MSG_PEEK))) {
		if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
			tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
		advance_queue(tsock);
	}
exit:
	up(&tsock->sem);
	return res;
}
Beispiel #24
0
static int send_stream(struct kiocb *iocb, struct socket *sock,
		       struct msghdr *m, size_t total_len)
{
	struct tipc_port *tport;
	struct msghdr my_msg;
	struct iovec my_iov;
	struct iovec *curr_iov;
	int curr_iovlen;
	char __user *curr_start;
	u32 hdr_size;
	int curr_left;
	int bytes_to_send;
	int bytes_sent;
	int res;

	/* Handle special cases where there is no connection */

	if (unlikely(sock->state != SS_CONNECTED)) {
		if (sock->state == SS_UNCONNECTED)
			return send_packet(iocb, sock, m, total_len);
		else if (sock->state == SS_DISCONNECTING)
			return -EPIPE;
		else
			return -ENOTCONN;
	}

	if (unlikely(m->msg_name))
		return -EISCONN;

	/*
	 * Send each iovec entry using one or more messages
	 *
	 * Note: This algorithm is good for the most likely case
	 * (i.e. one large iovec entry), but could be improved to pass sets
	 * of small iovec entries into send_packet().
	 */

	curr_iov = m->msg_iov;
	curr_iovlen = m->msg_iovlen;
	my_msg.msg_iov = &my_iov;
	my_msg.msg_iovlen = 1;
	my_msg.msg_flags = m->msg_flags;
	my_msg.msg_name = NULL;
	bytes_sent = 0;

	tport = tipc_sk(sock->sk)->p;
	hdr_size = msg_hdr_sz(&tport->phdr);

	while (curr_iovlen--) {
		curr_start = curr_iov->iov_base;
		curr_left = curr_iov->iov_len;

		while (curr_left) {
			bytes_to_send = tport->max_pkt - hdr_size;
			if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
				bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
			if (curr_left < bytes_to_send)
				bytes_to_send = curr_left;
			my_iov.iov_base = curr_start;
			my_iov.iov_len = bytes_to_send;
			if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) {
				if (bytes_sent != 0)
					res = bytes_sent;
				return res;
			}
			curr_left -= bytes_to_send;
			curr_start += bytes_to_send;
			bytes_sent += bytes_to_send;
		}

		curr_iov++;
	}

	return bytes_sent;
}
Beispiel #25
0
static int send_msg(struct kiocb *iocb, struct socket *sock,
		    struct msghdr *m, size_t total_len)
{
	struct tipc_sock *tsock = tipc_sk(sock->sk);
	struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
	struct sk_buff *buf;
	int needs_conn;
	int res = -EINVAL;

	if (unlikely(!dest))
		return -EDESTADDRREQ;
	if (unlikely((m->msg_namelen < sizeof(*dest)) ||
		     (dest->family != AF_TIPC)))
		return -EINVAL;

	needs_conn = (sock->state != SS_READY);
	if (unlikely(needs_conn)) {
		if (sock->state == SS_LISTENING)
			return -EPIPE;
		if (sock->state != SS_UNCONNECTED)
			return -EISCONN;
		if ((tsock->p->published) ||
		    ((sock->type == SOCK_STREAM) && (total_len != 0)))
			return -EOPNOTSUPP;
		if (dest->addrtype == TIPC_ADDR_NAME) {
			tsock->p->conn_type = dest->addr.name.name.type;
			tsock->p->conn_instance = dest->addr.name.name.instance;
		}
	}

	if (down_interruptible(&tsock->sem))
		return -ERESTARTSYS;

	if (needs_conn) {

		/* Abort any pending connection attempts (very unlikely) */

		while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
			tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
			atomic_dec(&tipc_queue_size);
		}

		sock->state = SS_CONNECTING;
	}

	do {
		if (dest->addrtype == TIPC_ADDR_NAME) {
			if ((res = dest_name_check(dest, m)))
				goto exit;
			res = tipc_send2name(tsock->p->ref,
					     &dest->addr.name.name,
					     dest->addr.name.domain,
					     m->msg_iovlen,
					     m->msg_iov);
		}
		else if (dest->addrtype == TIPC_ADDR_ID) {
			res = tipc_send2port(tsock->p->ref,
					     &dest->addr.id,
					     m->msg_iovlen,
					     m->msg_iov);
		}
		else if (dest->addrtype == TIPC_ADDR_MCAST) {
			if (needs_conn) {
				res = -EOPNOTSUPP;
				goto exit;
			}
			if ((res = dest_name_check(dest, m)))
				goto exit;
			res = tipc_multicast(tsock->p->ref,
					     &dest->addr.nameseq,
					     0,
					     m->msg_iovlen,
					     m->msg_iov);
		}
		if (likely(res != -ELINKCONG)) {
exit:
			up(&tsock->sem);
			return res;
		}
		if (m->msg_flags & MSG_DONTWAIT) {
			res = -EWOULDBLOCK;
			goto exit;
		}
		if (wait_event_interruptible(*sock->sk->sk_sleep,
					     !tsock->p->congested)) {
		    res = -ERESTARTSYS;
		    goto exit;
		}
	} while (1);
}