net/rxrpc/recvmsg.c

20  * Post a call for attention by the socket or kernel service.  Further
23 void rxrpc_notify_socket(struct rxrpc_call *call)
28 	_enter("%d", call->debug_id);
30 	if (!list_empty(&call->recvmsg_link))
35 	rx = rcu_dereference(call->socket);
38 		if (call->notify_rx) {
39 			spin_lock(&call->notify_lock);
40 			call->notify_rx(sk, call, call->user_call_ID);
41 			spin_unlock(&call->notify_lock);
44 			if (list_empty(&call->recvmsg_link)) {
45 				rxrpc_get_call(call, rxrpc_call_get_notify_socket);
46 				list_add_tail(&call->recvmsg_link, &rx->recvmsg_q);
51 				_debug("call %ps", sk->sk_data_ready);
62  * Pass a call terminating message to userspace.
64 static int rxrpc_recvmsg_term(struct rxrpc_call *call, struct msghdr *msg)
69 	switch (call->completion) {
72 		if (rxrpc_is_service_call(call))
76 		tmp = call->abort_code;
80 		tmp = call->abort_code;
84 		tmp = -call->error;
88 		tmp = -call->error;
92 		pr_err("Invalid terminal call state %u\n", call->completion);
97 	trace_rxrpc_recvdata(call, rxrpc_recvmsg_terminal,
98 			     call->ackr_window - 1,
99 			     call->rx_pkt_offset, call->rx_pkt_len, ret);
106 static void rxrpc_rotate_rx_window(struct rxrpc_call *call)
111 	rxrpc_seq_t old_consumed = call->rx_consumed, tseq;
115 	_enter("%d", call->debug_id);
117 	skb = skb_dequeue(&call->recvmsg_queue);
126 	if (after(tseq, call->rx_consumed))
127 		smp_store_release(&call->rx_consumed, tseq);
131 	trace_rxrpc_receive(call, last ? rxrpc_receive_rotate_last : rxrpc_receive_rotate,
132 			    serial, call->rx_consumed);
135 		set_bit(RXRPC_CALL_RECVMSG_READ_ALL, &call->flags);
138 	acked = atomic_add_return(call->rx_consumed - old_consumed,
139 				  &call->ackr_nr_consumed);
141 	    !test_and_set_bit(RXRPC_CALL_RX_IS_IDLE, &call->flags))
142 		rxrpc_poke_call(call, rxrpc_call_poke_idle);
148 static int rxrpc_verify_data(struct rxrpc_call *call, struct sk_buff *skb)
154 	return call->security->verify_packet(call, skb);
158  * Deliver messages to a call.  This keeps processing packets until the buffer
161  * call has failed it returns -EIO.
163 static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
174 	rx_pkt_offset = call->rx_pkt_offset;
175 	rx_pkt_len = call->rx_pkt_len;
177 	if (rxrpc_call_has_failed(call)) {
178 		seq = call->ackr_window - 1;
183 	if (test_bit(RXRPC_CALL_RECVMSG_READ_ALL, &call->flags)) {
184 		seq = call->ackr_window - 1;
192 	skb = skb_peek(&call->recvmsg_queue);
199 			trace_rxrpc_receive(call, rxrpc_receive_front,
206 			ret2 = rxrpc_verify_data(call, skb);
207 			trace_rxrpc_recvdata(call, rxrpc_recvmsg_next, seq,
217 			trace_rxrpc_recvdata(call, rxrpc_recvmsg_cont, seq,
241 			trace_rxrpc_recvdata(call, rxrpc_recvmsg_full, seq,
254 		skb = skb_peek_next(skb, &call->recvmsg_queue);
257 			rxrpc_rotate_rx_window(call);
262 		call->rx_pkt_offset = rx_pkt_offset;
263 		call->rx_pkt_len = rx_pkt_len;
266 	trace_rxrpc_recvdata(call, rxrpc_recvmsg_data_return, seq,
269 		set_bit(RXRPC_CALL_RX_IS_IDLE, &call->flags);
281 	struct rxrpc_call *call;
312 			call = NULL;
335 	/* Find the next call and dequeue it if we're not just peeking.  If we
342 	call = list_entry(l, struct rxrpc_call, recvmsg_link);
344 	if (!rxrpc_call_is_complete(call) &&
345 	    skb_queue_empty(&call->recvmsg_queue)) {
346 		list_del_init(&call->recvmsg_link);
349 		trace_rxrpc_recvmsg(call->debug_id, rxrpc_recvmsg_unqueue, 0);
350 		rxrpc_put_call(call, rxrpc_call_put_recvmsg);
355 		list_del_init(&call->recvmsg_link);
357 		rxrpc_get_call(call, rxrpc_call_get_recvmsg);
360 	call_debug_id = call->debug_id;
363 	/* We're going to drop the socket lock, so we need to lock the call
366 	if (!mutex_trylock(&call->user_mutex)) {
371 		if (mutex_lock_interruptible(&call->user_mutex) < 0)
377 	if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
380 	if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
382 			unsigned int id32 = call->user_call_ID;
387 			unsigned long idl = call->user_call_ID;
396 	if (msg->msg_name && call->peer) {
397 		size_t len = sizeof(call->dest_srx);
399 		memcpy(msg->msg_name, &call->dest_srx, len);
403 	ret = rxrpc_recvmsg_data(sock, call, msg, &msg->msg_iter, len,
412 	if (rxrpc_call_is_complete(call) &&
413 	    skb_queue_empty(&call->recvmsg_queue))
415 	if (rxrpc_call_has_failed(call))
418 	if (!skb_queue_empty(&call->recvmsg_queue))
419 		rxrpc_notify_socket(call);
423 	rxrpc_purge_queue(&call->recvmsg_queue);
425 	ret = rxrpc_recvmsg_term(call, msg);
429 		rxrpc_release_call(rx, call);
441 	mutex_unlock(&call->user_mutex);
442 	rxrpc_put_call(call, rxrpc_call_put_recvmsg);
449 		list_add(&call->recvmsg_link, &rx->recvmsg_q);
453 		rxrpc_put_call(call, rxrpc_call_put_recvmsg);
465 	call = NULL;
471  * @sock: The socket that the call exists on
472  * @call: The call to send data through
480  * state of a call.  Returns 0 if got what was asked for and there's more
489 int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
496 	_enter("{%d},%zu,%d", call->debug_id, *_len, want_more);
498 	mutex_lock(&call->user_mutex);
500 	ret = rxrpc_recvmsg_data(sock, call, NULL, iter, *_len, 0, &offset);
528 		*_service = call->dest_srx.srx_service;
529 	mutex_unlock(&call->user_mutex);
534 	trace_rxrpc_abort(call->debug_id, rxrpc_recvmsg_short_data,
535 			  call->cid, call->call_id, call->rx_consumed,
540 	trace_rxrpc_abort(call->debug_id, rxrpc_recvmsg_excess_data,
541 			  call->cid, call->call_id, call->rx_consumed,
546 	*_abort = call->abort_code;
547 	ret = call->error;
548 	if (call->completion == RXRPC_CALL_SUCCEEDED) {