/**
* 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;
}
struct ostream *
o_stream_create_ext_filter(struct ostream *output, const char *socket_path,
const char *args)
{
struct mail_filter_ostream *mstream;
mstream = i_new(struct mail_filter_ostream, 1);
mstream->fd = -1;
mstream->ostream.iostream.close = o_stream_mail_filter_close;
mstream->ostream.sendv = o_stream_mail_filter_sendv;
mstream->ostream.flush = o_stream_mail_filter_flush;
(void)filter_connect(mstream, socket_path, args);
return o_stream_create(&mstream->ostream, output, mstream->fd);
}
struct istream *
i_stream_create_ext_filter(struct istream *input, const char *socket_path,
const char *args)
{
struct mail_filter_istream *mstream;
mstream = i_new(struct mail_filter_istream, 1);
mstream->istream.iostream.close = i_stream_mail_filter_close;
mstream->istream.max_buffer_size = input->real_stream->max_buffer_size;
mstream->istream.read = i_stream_mail_filter_read;
mstream->istream.stat = i_stream_mail_filter_stat;
mstream->istream.istream.readable_fd = FALSE;
mstream->istream.istream.blocking = input->blocking;
mstream->istream.istream.seekable = FALSE;
mstream->fd = -1;
(void)filter_connect(mstream, socket_path, args);
return i_stream_create(&mstream->istream, input, mstream->fd);
}
void lime_filter_connect(Filter *source, Filter *sink)
{
filter_connect(source, 0, sink, 0);
}
