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![oscar.medina@motorola.com](/assets/img/avatar_default.png)
This patch allows a TIPC application to determine the number of messages currently waiting in a socket's receive queue (TIPC_SOCK_RECVQ_DEPTH) or in all TIPC socket receive queues (TIPC_NODE_RECVQ_DEPTH). Signed-off-by: Oscar Medina <oscar.medina@motorola.com> Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1898 lines
46 KiB
C
1898 lines
46 KiB
C
/*
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* net/tipc/socket.c: TIPC socket API
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*
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* Copyright (c) 2001-2007, Ericsson AB
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* Copyright (c) 2004-2008, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/net.h>
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#include <linux/socket.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/fcntl.h>
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#include <asm/string.h>
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#include <asm/atomic.h>
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#include <net/sock.h>
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#include <linux/tipc.h>
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#include <linux/tipc_config.h>
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#include <net/tipc/tipc_msg.h>
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#include <net/tipc/tipc_port.h>
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#include "core.h"
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#define SS_LISTENING -1 /* socket is listening */
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#define SS_READY -2 /* socket is connectionless */
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#define OVERLOAD_LIMIT_BASE 5000
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#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
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struct tipc_sock {
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struct sock sk;
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struct tipc_port *p;
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struct tipc_portid peer_name;
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};
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#define tipc_sk(sk) ((struct tipc_sock *)(sk))
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#define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
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static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
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static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
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static void wakeupdispatch(struct tipc_port *tport);
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static const struct proto_ops packet_ops;
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static const struct proto_ops stream_ops;
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static const struct proto_ops msg_ops;
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static struct proto tipc_proto;
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static int sockets_enabled = 0;
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static atomic_t tipc_queue_size = ATOMIC_INIT(0);
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/*
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* Revised TIPC socket locking policy:
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*
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* Most socket operations take the standard socket lock when they start
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* and hold it until they finish (or until they need to sleep). Acquiring
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* this lock grants the owner exclusive access to the fields of the socket
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* data structures, with the exception of the backlog queue. A few socket
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* operations can be done without taking the socket lock because they only
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* read socket information that never changes during the life of the socket.
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*
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* Socket operations may acquire the lock for the associated TIPC port if they
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* need to perform an operation on the port. If any routine needs to acquire
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* both the socket lock and the port lock it must take the socket lock first
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* to avoid the risk of deadlock.
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*
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* The dispatcher handling incoming messages cannot grab the socket lock in
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* the standard fashion, since invoked it runs at the BH level and cannot block.
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* Instead, it checks to see if the socket lock is currently owned by someone,
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* and either handles the message itself or adds it to the socket's backlog
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* queue; in the latter case the queued message is processed once the process
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* owning the socket lock releases it.
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*
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* NOTE: Releasing the socket lock while an operation is sleeping overcomes
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* the problem of a blocked socket operation preventing any other operations
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* from occurring. However, applications must be careful if they have
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* multiple threads trying to send (or receive) on the same socket, as these
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* operations might interfere with each other. For example, doing a connect
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* and a receive at the same time might allow the receive to consume the
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* ACK message meant for the connect. While additional work could be done
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* to try and overcome this, it doesn't seem to be worthwhile at the present.
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*
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* NOTE: Releasing the socket lock while an operation is sleeping also ensures
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* that another operation that must be performed in a non-blocking manner is
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* not delayed for very long because the lock has already been taken.
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*
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* NOTE: This code assumes that certain fields of a port/socket pair are
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* constant over its lifetime; such fields can be examined without taking
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* the socket lock and/or port lock, and do not need to be re-read even
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* after resuming processing after waiting. These fields include:
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* - socket type
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* - pointer to socket sk structure (aka tipc_sock structure)
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* - pointer to port structure
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* - port reference
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*/
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/**
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* advance_rx_queue - discard first buffer in socket receive queue
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*
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* Caller must hold socket lock
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*/
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static void advance_rx_queue(struct sock *sk)
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{
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buf_discard(__skb_dequeue(&sk->sk_receive_queue));
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atomic_dec(&tipc_queue_size);
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}
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/**
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* discard_rx_queue - discard all buffers in socket receive queue
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*
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* Caller must hold socket lock
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*/
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static void discard_rx_queue(struct sock *sk)
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{
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struct sk_buff *buf;
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while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
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atomic_dec(&tipc_queue_size);
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buf_discard(buf);
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}
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}
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/**
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* reject_rx_queue - reject all buffers in socket receive queue
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*
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* Caller must hold socket lock
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*/
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static void reject_rx_queue(struct sock *sk)
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{
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struct sk_buff *buf;
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while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
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tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
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atomic_dec(&tipc_queue_size);
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}
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}
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/**
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* tipc_create - create a TIPC socket
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* @net: network namespace (must be default network)
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* @sock: pre-allocated socket structure
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* @protocol: protocol indicator (must be 0)
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*
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* This routine creates additional data structures used by the TIPC socket,
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* initializes them, and links them together.
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*
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* Returns 0 on success, errno otherwise
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*/
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static int tipc_create(struct net *net, struct socket *sock, int protocol)
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{
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const struct proto_ops *ops;
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socket_state state;
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struct sock *sk;
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struct tipc_port *tp_ptr;
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/* Validate arguments */
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if (net != &init_net)
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return -EAFNOSUPPORT;
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if (unlikely(protocol != 0))
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return -EPROTONOSUPPORT;
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switch (sock->type) {
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case SOCK_STREAM:
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ops = &stream_ops;
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state = SS_UNCONNECTED;
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break;
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case SOCK_SEQPACKET:
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ops = &packet_ops;
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state = SS_UNCONNECTED;
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break;
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case SOCK_DGRAM:
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case SOCK_RDM:
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ops = &msg_ops;
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state = SS_READY;
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break;
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default:
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return -EPROTOTYPE;
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}
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/* Allocate socket's protocol area */
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sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
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if (sk == NULL)
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return -ENOMEM;
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/* Allocate TIPC port for socket to use */
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tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
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TIPC_LOW_IMPORTANCE);
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if (unlikely(!tp_ptr)) {
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sk_free(sk);
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return -ENOMEM;
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}
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/* Finish initializing socket data structures */
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sock->ops = ops;
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sock->state = state;
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sock_init_data(sock, sk);
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sk->sk_rcvtimeo = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
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sk->sk_backlog_rcv = backlog_rcv;
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tipc_sk(sk)->p = tp_ptr;
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spin_unlock_bh(tp_ptr->lock);
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if (sock->state == SS_READY) {
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tipc_set_portunreturnable(tp_ptr->ref, 1);
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if (sock->type == SOCK_DGRAM)
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tipc_set_portunreliable(tp_ptr->ref, 1);
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}
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atomic_inc(&tipc_user_count);
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return 0;
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}
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/**
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* release - destroy a TIPC socket
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* @sock: socket to destroy
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*
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* This routine cleans up any messages that are still queued on the socket.
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* For DGRAM and RDM socket types, all queued messages are rejected.
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* For SEQPACKET and STREAM socket types, the first message is rejected
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* and any others are discarded. (If the first message on a STREAM socket
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* is partially-read, it is discarded and the next one is rejected instead.)
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*
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* NOTE: Rejected messages are not necessarily returned to the sender! They
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* are returned or discarded according to the "destination droppable" setting
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* specified for the message by the sender.
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*
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* Returns 0 on success, errno otherwise
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*/
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static int release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct tipc_port *tport;
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struct sk_buff *buf;
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int res;
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/*
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* Exit if socket isn't fully initialized (occurs when a failed accept()
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* releases a pre-allocated child socket that was never used)
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*/
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if (sk == NULL)
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return 0;
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tport = tipc_sk_port(sk);
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lock_sock(sk);
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/*
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* Reject all unreceived messages, except on an active connection
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* (which disconnects locally & sends a 'FIN+' to peer)
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*/
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while (sock->state != SS_DISCONNECTING) {
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buf = __skb_dequeue(&sk->sk_receive_queue);
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if (buf == NULL)
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break;
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atomic_dec(&tipc_queue_size);
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if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
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buf_discard(buf);
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else {
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if ((sock->state == SS_CONNECTING) ||
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(sock->state == SS_CONNECTED)) {
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sock->state = SS_DISCONNECTING;
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tipc_disconnect(tport->ref);
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}
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tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
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}
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}
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/*
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* Delete TIPC port; this ensures no more messages are queued
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* (also disconnects an active connection & sends a 'FIN-' to peer)
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*/
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res = tipc_deleteport(tport->ref);
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/* Discard any remaining (connection-based) messages in receive queue */
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discard_rx_queue(sk);
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/* Reject any messages that accumulated in backlog queue */
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sock->state = SS_DISCONNECTING;
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release_sock(sk);
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sock_put(sk);
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sock->sk = NULL;
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atomic_dec(&tipc_user_count);
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return res;
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}
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/**
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* bind - associate or disassocate TIPC name(s) with a socket
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* @sock: socket structure
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* @uaddr: socket address describing name(s) and desired operation
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* @uaddr_len: size of socket address data structure
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*
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* Name and name sequence binding is indicated using a positive scope value;
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* a negative scope value unbinds the specified name. Specifying no name
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* (i.e. a socket address length of 0) unbinds all names from the socket.
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*
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* Returns 0 on success, errno otherwise
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*
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* NOTE: This routine doesn't need to take the socket lock since it doesn't
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* access any non-constant socket information.
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*/
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static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
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{
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struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
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u32 portref = tipc_sk_port(sock->sk)->ref;
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if (unlikely(!uaddr_len))
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return tipc_withdraw(portref, 0, NULL);
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if (uaddr_len < sizeof(struct sockaddr_tipc))
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return -EINVAL;
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if (addr->family != AF_TIPC)
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return -EAFNOSUPPORT;
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if (addr->addrtype == TIPC_ADDR_NAME)
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addr->addr.nameseq.upper = addr->addr.nameseq.lower;
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else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
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return -EAFNOSUPPORT;
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return (addr->scope > 0) ?
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tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
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tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
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}
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/**
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* get_name - get port ID of socket or peer socket
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* @sock: socket structure
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* @uaddr: area for returned socket address
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* @uaddr_len: area for returned length of socket address
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* @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
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*
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* Returns 0 on success, errno otherwise
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*
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* NOTE: This routine doesn't need to take the socket lock since it only
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* accesses socket information that is unchanging (or which changes in
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* a completely predictable manner).
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*/
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static int get_name(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer)
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{
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struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
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struct tipc_sock *tsock = tipc_sk(sock->sk);
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if (peer) {
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if ((sock->state != SS_CONNECTED) &&
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((peer != 2) || (sock->state != SS_DISCONNECTING)))
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return -ENOTCONN;
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addr->addr.id.ref = tsock->peer_name.ref;
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addr->addr.id.node = tsock->peer_name.node;
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} else {
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tipc_ownidentity(tsock->p->ref, &addr->addr.id);
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}
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*uaddr_len = sizeof(*addr);
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addr->addrtype = TIPC_ADDR_ID;
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addr->family = AF_TIPC;
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addr->scope = 0;
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addr->addr.name.domain = 0;
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return 0;
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}
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/**
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* poll - read and possibly block on pollmask
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* @file: file structure associated with the socket
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* @sock: socket for which to calculate the poll bits
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* @wait: ???
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*
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* Returns pollmask value
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*
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* COMMENTARY:
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* It appears that the usual socket locking mechanisms are not useful here
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* since the pollmask info is potentially out-of-date the moment this routine
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* exits. TCP and other protocols seem to rely on higher level poll routines
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* to handle any preventable race conditions, so TIPC will do the same ...
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*
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* TIPC sets the returned events as follows:
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* a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
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* or if a connection-oriented socket is does not have an active connection
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* (i.e. a read operation will not block).
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* b) POLLOUT is set except when a socket's connection has been terminated
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* (i.e. a write operation will not block).
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* c) POLLHUP is set when a socket's connection has been terminated.
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*
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* IMPORTANT: The fact that a read or write operation will not block does NOT
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* imply that the operation will succeed!
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*/
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static unsigned int poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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u32 mask;
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poll_wait(file, sk->sk_sleep, wait);
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if (!skb_queue_empty(&sk->sk_receive_queue) ||
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(sock->state == SS_UNCONNECTED) ||
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(sock->state == SS_DISCONNECTING))
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mask = (POLLRDNORM | POLLIN);
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else
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mask = 0;
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if (sock->state == SS_DISCONNECTING)
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mask |= POLLHUP;
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else
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mask |= POLLOUT;
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return mask;
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}
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/**
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* dest_name_check - verify user is permitted to send to specified port name
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* @dest: destination address
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* @m: descriptor for message to be sent
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*
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* Prevents restricted configuration commands from being issued by
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* unauthorized users.
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*
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* Returns 0 if permission is granted, otherwise errno
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*/
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static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
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{
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struct tipc_cfg_msg_hdr hdr;
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if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
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return 0;
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if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
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return 0;
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if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
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return -EACCES;
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if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
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return -EFAULT;
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if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
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return -EACCES;
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return 0;
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}
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|
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/**
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* send_msg - send message in connectionless manner
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* @iocb: if NULL, indicates that socket lock is already held
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* @sock: socket structure
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* @m: message to send
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* @total_len: length of message
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*
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* Message must have an destination specified explicitly.
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* Used for SOCK_RDM and SOCK_DGRAM messages,
|
|
* and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
|
|
* (Note: 'SYN+' is prohibited on SOCK_STREAM.)
|
|
*
|
|
* Returns the number of bytes sent on success, or errno otherwise
|
|
*/
|
|
|
|
static int send_msg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(sk);
|
|
struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
|
|
int needs_conn;
|
|
int res = -EINVAL;
|
|
|
|
if (unlikely(!dest))
|
|
return -EDESTADDRREQ;
|
|
if (unlikely((m->msg_namelen < sizeof(*dest)) ||
|
|
(dest->family != AF_TIPC)))
|
|
return -EINVAL;
|
|
|
|
if (iocb)
|
|
lock_sock(sk);
|
|
|
|
needs_conn = (sock->state != SS_READY);
|
|
if (unlikely(needs_conn)) {
|
|
if (sock->state == SS_LISTENING) {
|
|
res = -EPIPE;
|
|
goto exit;
|
|
}
|
|
if (sock->state != SS_UNCONNECTED) {
|
|
res = -EISCONN;
|
|
goto exit;
|
|
}
|
|
if ((tport->published) ||
|
|
((sock->type == SOCK_STREAM) && (total_len != 0))) {
|
|
res = -EOPNOTSUPP;
|
|
goto exit;
|
|
}
|
|
if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
tport->conn_type = dest->addr.name.name.type;
|
|
tport->conn_instance = dest->addr.name.name.instance;
|
|
}
|
|
|
|
/* Abort any pending connection attempts (very unlikely) */
|
|
|
|
reject_rx_queue(sk);
|
|
}
|
|
|
|
do {
|
|
if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
if ((res = dest_name_check(dest, m)))
|
|
break;
|
|
res = tipc_send2name(tport->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(tport->ref,
|
|
&dest->addr.id,
|
|
m->msg_iovlen,
|
|
m->msg_iov);
|
|
}
|
|
else if (dest->addrtype == TIPC_ADDR_MCAST) {
|
|
if (needs_conn) {
|
|
res = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
if ((res = dest_name_check(dest, m)))
|
|
break;
|
|
res = tipc_multicast(tport->ref,
|
|
&dest->addr.nameseq,
|
|
0,
|
|
m->msg_iovlen,
|
|
m->msg_iov);
|
|
}
|
|
if (likely(res != -ELINKCONG)) {
|
|
if (needs_conn && (res >= 0)) {
|
|
sock->state = SS_CONNECTING;
|
|
}
|
|
break;
|
|
}
|
|
if (m->msg_flags & MSG_DONTWAIT) {
|
|
res = -EWOULDBLOCK;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
res = wait_event_interruptible(*sk->sk_sleep,
|
|
!tport->congested);
|
|
lock_sock(sk);
|
|
if (res)
|
|
break;
|
|
} while (1);
|
|
|
|
exit:
|
|
if (iocb)
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* send_packet - send a connection-oriented message
|
|
* @iocb: if NULL, indicates that socket lock is already held
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @total_len: length of message
|
|
*
|
|
* Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
|
|
*
|
|
* Returns the number of bytes sent on success, or errno otherwise
|
|
*/
|
|
|
|
static int send_packet(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(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 (iocb)
|
|
lock_sock(sk);
|
|
|
|
do {
|
|
if (unlikely(sock->state != SS_CONNECTED)) {
|
|
if (sock->state == SS_DISCONNECTING)
|
|
res = -EPIPE;
|
|
else
|
|
res = -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov);
|
|
if (likely(res != -ELINKCONG)) {
|
|
break;
|
|
}
|
|
if (m->msg_flags & MSG_DONTWAIT) {
|
|
res = -EWOULDBLOCK;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
res = wait_event_interruptible(*sk->sk_sleep,
|
|
(!tport->congested || !tport->connected));
|
|
lock_sock(sk);
|
|
if (res)
|
|
break;
|
|
} while (1);
|
|
|
|
if (iocb)
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* send_stream - send stream-oriented data
|
|
* @iocb: (unused)
|
|
* @sock: socket structure
|
|
* @m: data to send
|
|
* @total_len: total length of data to be sent
|
|
*
|
|
* Used for SOCK_STREAM data.
|
|
*
|
|
* Returns the number of bytes sent on success (or partial success),
|
|
* or errno if no data sent
|
|
*/
|
|
|
|
static int send_stream(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t total_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(sk);
|
|
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;
|
|
|
|
lock_sock(sk);
|
|
|
|
/* Handle special cases where there is no connection */
|
|
|
|
if (unlikely(sock->state != SS_CONNECTED)) {
|
|
if (sock->state == SS_UNCONNECTED) {
|
|
res = send_packet(NULL, sock, m, total_len);
|
|
goto exit;
|
|
} else if (sock->state == SS_DISCONNECTING) {
|
|
res = -EPIPE;
|
|
goto exit;
|
|
} else {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if (unlikely(m->msg_name)) {
|
|
res = -EISCONN;
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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(NULL, sock, &my_msg, 0)) < 0) {
|
|
if (bytes_sent)
|
|
res = bytes_sent;
|
|
goto exit;
|
|
}
|
|
curr_left -= bytes_to_send;
|
|
curr_start += bytes_to_send;
|
|
bytes_sent += bytes_to_send;
|
|
}
|
|
|
|
curr_iov++;
|
|
}
|
|
res = bytes_sent;
|
|
exit:
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* set_orig_addr - capture sender's address for received message
|
|
* @m: descriptor for message info
|
|
* @msg: received message header
|
|
*
|
|
* Note: Address is not captured if not requested by receiver.
|
|
*/
|
|
|
|
static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
|
|
{
|
|
struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
|
|
|
|
if (addr) {
|
|
addr->family = AF_TIPC;
|
|
addr->addrtype = TIPC_ADDR_ID;
|
|
addr->addr.id.ref = msg_origport(msg);
|
|
addr->addr.id.node = msg_orignode(msg);
|
|
addr->addr.name.domain = 0; /* could leave uninitialized */
|
|
addr->scope = 0; /* could leave uninitialized */
|
|
m->msg_namelen = sizeof(struct sockaddr_tipc);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* anc_data_recv - optionally capture ancillary data for received message
|
|
* @m: descriptor for message info
|
|
* @msg: received message header
|
|
* @tport: TIPC port associated with message
|
|
*
|
|
* Note: Ancillary data is not captured if not requested by receiver.
|
|
*
|
|
* Returns 0 if successful, otherwise errno
|
|
*/
|
|
|
|
static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
|
|
struct tipc_port *tport)
|
|
{
|
|
u32 anc_data[3];
|
|
u32 err;
|
|
u32 dest_type;
|
|
int has_name;
|
|
int res;
|
|
|
|
if (likely(m->msg_controllen == 0))
|
|
return 0;
|
|
|
|
/* Optionally capture errored message object(s) */
|
|
|
|
err = msg ? msg_errcode(msg) : 0;
|
|
if (unlikely(err)) {
|
|
anc_data[0] = err;
|
|
anc_data[1] = msg_data_sz(msg);
|
|
if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data)))
|
|
return res;
|
|
if (anc_data[1] &&
|
|
(res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
|
|
msg_data(msg))))
|
|
return res;
|
|
}
|
|
|
|
/* Optionally capture message destination object */
|
|
|
|
dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
|
|
switch (dest_type) {
|
|
case TIPC_NAMED_MSG:
|
|
has_name = 1;
|
|
anc_data[0] = msg_nametype(msg);
|
|
anc_data[1] = msg_namelower(msg);
|
|
anc_data[2] = msg_namelower(msg);
|
|
break;
|
|
case TIPC_MCAST_MSG:
|
|
has_name = 1;
|
|
anc_data[0] = msg_nametype(msg);
|
|
anc_data[1] = msg_namelower(msg);
|
|
anc_data[2] = msg_nameupper(msg);
|
|
break;
|
|
case TIPC_CONN_MSG:
|
|
has_name = (tport->conn_type != 0);
|
|
anc_data[0] = tport->conn_type;
|
|
anc_data[1] = tport->conn_instance;
|
|
anc_data[2] = tport->conn_instance;
|
|
break;
|
|
default:
|
|
has_name = 0;
|
|
}
|
|
if (has_name &&
|
|
(res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data)))
|
|
return res;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* recv_msg - receive packet-oriented message
|
|
* @iocb: (unused)
|
|
* @m: descriptor for message info
|
|
* @buf_len: total size of user buffer area
|
|
* @flags: receive flags
|
|
*
|
|
* Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
|
|
* If the complete message doesn't fit in user area, truncate it.
|
|
*
|
|
* Returns size of returned message data, errno otherwise
|
|
*/
|
|
|
|
static int recv_msg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t buf_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(sk);
|
|
struct sk_buff *buf;
|
|
struct tipc_msg *msg;
|
|
unsigned int sz;
|
|
u32 err;
|
|
int res;
|
|
|
|
/* Catch invalid receive requests */
|
|
|
|
if (m->msg_iovlen != 1)
|
|
return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */
|
|
|
|
if (unlikely(!buf_len))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sock->state == SS_UNCONNECTED)) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
|
|
restart:
|
|
|
|
/* Look for a message in receive queue; wait if necessary */
|
|
|
|
while (skb_queue_empty(&sk->sk_receive_queue)) {
|
|
if (sock->state == SS_DISCONNECTING) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
if (flags & MSG_DONTWAIT) {
|
|
res = -EWOULDBLOCK;
|
|
goto exit;
|
|
}
|
|
release_sock(sk);
|
|
res = wait_event_interruptible(*sk->sk_sleep,
|
|
(!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(sock->state == SS_DISCONNECTING)));
|
|
lock_sock(sk);
|
|
if (res)
|
|
goto exit;
|
|
}
|
|
|
|
/* Look at first message in receive queue */
|
|
|
|
buf = skb_peek(&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)) {
|
|
res = auto_connect(sock, msg);
|
|
if (res)
|
|
goto exit;
|
|
}
|
|
|
|
/* Discard an empty non-errored message & try again */
|
|
|
|
if ((!sz) && (!err)) {
|
|
advance_rx_queue(sk);
|
|
goto restart;
|
|
}
|
|
|
|
/* Capture sender's address (optional) */
|
|
|
|
set_orig_addr(m, msg);
|
|
|
|
/* Capture ancillary data (optional) */
|
|
|
|
res = anc_data_recv(m, msg, tport);
|
|
if (res)
|
|
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 ((sock->state != SS_READY) &&
|
|
(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
|
|
tipc_acknowledge(tport->ref, tport->conn_unacked);
|
|
advance_rx_queue(sk);
|
|
}
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* recv_stream - receive stream-oriented data
|
|
* @iocb: (unused)
|
|
* @m: descriptor for message info
|
|
* @buf_len: total size of user buffer area
|
|
* @flags: receive flags
|
|
*
|
|
* Used for SOCK_STREAM messages only. If not enough data is available
|
|
* will optionally wait for more; never truncates data.
|
|
*
|
|
* Returns size of returned message data, errno otherwise
|
|
*/
|
|
|
|
static int recv_stream(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t buf_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(sk);
|
|
struct sk_buff *buf;
|
|
struct tipc_msg *msg;
|
|
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 = 0;
|
|
|
|
/* Catch invalid receive attempts */
|
|
|
|
if (m->msg_iovlen != 1)
|
|
return -EOPNOTSUPP; /* Don't do multiple iovec entries yet */
|
|
|
|
if (unlikely(!buf_len))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely((sock->state == SS_UNCONNECTED) ||
|
|
(sock->state == SS_CONNECTING))) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
|
|
restart:
|
|
|
|
/* Look for a message in receive queue; wait if necessary */
|
|
|
|
while (skb_queue_empty(&sk->sk_receive_queue)) {
|
|
if (sock->state == SS_DISCONNECTING) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
if (flags & MSG_DONTWAIT) {
|
|
res = -EWOULDBLOCK;
|
|
goto exit;
|
|
}
|
|
release_sock(sk);
|
|
res = wait_event_interruptible(*sk->sk_sleep,
|
|
(!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(sock->state == SS_DISCONNECTING)));
|
|
lock_sock(sk);
|
|
if (res)
|
|
goto exit;
|
|
}
|
|
|
|
/* Look at first message in receive queue */
|
|
|
|
buf = skb_peek(&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_rx_queue(sk);
|
|
goto restart;
|
|
}
|
|
|
|
/* Optionally capture sender's address & ancillary data of first msg */
|
|
|
|
if (sz_copied == 0) {
|
|
set_orig_addr(m, msg);
|
|
res = anc_data_recv(m, msg, tport);
|
|
if (res)
|
|
goto exit;
|
|
}
|
|
|
|
/* Capture message data (if valid) & compute return value (always) */
|
|
|
|
if (!err) {
|
|
buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
|
|
sz = (unsigned char *)msg + msg_size(msg) - 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(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
|
|
tipc_acknowledge(tport->ref, tport->conn_unacked);
|
|
advance_rx_queue(sk);
|
|
}
|
|
|
|
/* Loop around if more data is required */
|
|
|
|
if ((sz_copied < buf_len) /* didn't get all requested data */
|
|
&& (!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(flags & MSG_WAITALL))
|
|
/* ... and more is ready or required */
|
|
&& (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
|
|
&& (!err) /* ... and haven't reached a FIN */
|
|
)
|
|
goto restart;
|
|
|
|
exit:
|
|
release_sock(sk);
|
|
return sz_copied ? sz_copied : res;
|
|
}
|
|
|
|
/**
|
|
* rx_queue_full - determine if receive queue can accept another message
|
|
* @msg: message to be added to queue
|
|
* @queue_size: current size of queue
|
|
* @base: nominal maximum size of queue
|
|
*
|
|
* Returns 1 if queue is unable to accept message, 0 otherwise
|
|
*/
|
|
|
|
static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
|
|
{
|
|
u32 threshold;
|
|
u32 imp = msg_importance(msg);
|
|
|
|
if (imp == TIPC_LOW_IMPORTANCE)
|
|
threshold = base;
|
|
else if (imp == TIPC_MEDIUM_IMPORTANCE)
|
|
threshold = base * 2;
|
|
else if (imp == TIPC_HIGH_IMPORTANCE)
|
|
threshold = base * 100;
|
|
else
|
|
return 0;
|
|
|
|
if (msg_connected(msg))
|
|
threshold *= 4;
|
|
|
|
return (queue_size >= threshold);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
u32 recv_q_len;
|
|
|
|
/* Reject message if it is wrong sort of message for socket */
|
|
|
|
/*
|
|
* WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
|
|
* "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
|
|
* BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
|
|
*/
|
|
|
|
if (sock->state == SS_READY) {
|
|
if (msg_connected(msg)) {
|
|
msg_dbg(msg, "dispatch filter 1\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
} else {
|
|
if (msg_mcast(msg)) {
|
|
msg_dbg(msg, "dispatch filter 2\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
if (sock->state == SS_CONNECTED) {
|
|
if (!msg_connected(msg)) {
|
|
msg_dbg(msg, "dispatch filter 3\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
}
|
|
else if (sock->state == SS_CONNECTING) {
|
|
if (!msg_connected(msg) && (msg_errcode(msg) == 0)) {
|
|
msg_dbg(msg, "dispatch filter 4\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
}
|
|
else if (sock->state == SS_LISTENING) {
|
|
if (msg_connected(msg) || msg_errcode(msg)) {
|
|
msg_dbg(msg, "dispatch filter 5\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
}
|
|
else if (sock->state == SS_DISCONNECTING) {
|
|
msg_dbg(msg, "dispatch filter 6\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
else /* (sock->state == SS_UNCONNECTED) */ {
|
|
if (msg_connected(msg) || msg_errcode(msg)) {
|
|
msg_dbg(msg, "dispatch filter 7\n");
|
|
return TIPC_ERR_NO_PORT;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Reject message if there isn't room to queue it */
|
|
|
|
recv_q_len = (u32)atomic_read(&tipc_queue_size);
|
|
if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
|
|
if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
|
|
return TIPC_ERR_OVERLOAD;
|
|
}
|
|
recv_q_len = skb_queue_len(&sk->sk_receive_queue);
|
|
if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
|
|
if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
|
|
return TIPC_ERR_OVERLOAD;
|
|
}
|
|
|
|
/* Enqueue message (finally!) */
|
|
|
|
msg_dbg(msg, "<DISP<: ");
|
|
TIPC_SKB_CB(buf)->handle = msg_data(msg);
|
|
atomic_inc(&tipc_queue_size);
|
|
__skb_queue_tail(&sk->sk_receive_queue, buf);
|
|
|
|
/* Initiate connection termination for an incoming 'FIN' */
|
|
|
|
if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
|
|
sock->state = SS_DISCONNECTING;
|
|
tipc_disconnect_port(tipc_sk_port(sk));
|
|
}
|
|
|
|
if (waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
return TIPC_OK;
|
|
}
|
|
|
|
/**
|
|
* backlog_rcv - handle incoming message from backlog queue
|
|
* @sk: socket
|
|
* @buf: message
|
|
*
|
|
* Caller must hold socket lock, but not port lock.
|
|
*
|
|
* Returns 0
|
|
*/
|
|
|
|
static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
|
|
{
|
|
u32 res;
|
|
|
|
res = filter_rcv(sk, buf);
|
|
if (res)
|
|
tipc_reject_msg(buf, res);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dispatch - handle incoming message
|
|
* @tport: TIPC port that received message
|
|
* @buf: message
|
|
*
|
|
* Called with port lock already taken.
|
|
*
|
|
* Returns TIPC error status code (TIPC_OK if message is not to be rejected)
|
|
*/
|
|
|
|
static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
|
|
{
|
|
struct sock *sk = (struct sock *)tport->usr_handle;
|
|
u32 res;
|
|
|
|
/*
|
|
* Process message if socket is unlocked; otherwise add to backlog queue
|
|
*
|
|
* This code is based on sk_receive_skb(), but must be distinct from it
|
|
* since a TIPC-specific filter/reject mechanism is utilized
|
|
*/
|
|
|
|
bh_lock_sock(sk);
|
|
if (!sock_owned_by_user(sk)) {
|
|
res = filter_rcv(sk, buf);
|
|
} else {
|
|
sk_add_backlog(sk, buf);
|
|
res = TIPC_OK;
|
|
}
|
|
bh_unlock_sock(sk);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* wakeupdispatch - wake up port after congestion
|
|
* @tport: port to wakeup
|
|
*
|
|
* Called with port lock already taken.
|
|
*/
|
|
|
|
static void wakeupdispatch(struct tipc_port *tport)
|
|
{
|
|
struct sock *sk = (struct sock *)tport->usr_handle;
|
|
|
|
if (waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
}
|
|
|
|
/**
|
|
* 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,};
|
|
struct sk_buff *buf;
|
|
struct tipc_msg *msg;
|
|
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 = -EWOULDBLOCK;
|
|
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 */
|
|
|
|
release_sock(sk);
|
|
res = wait_event_interruptible_timeout(*sk->sk_sleep,
|
|
(!skb_queue_empty(&sk->sk_receive_queue) ||
|
|
(sock->state != SS_CONNECTING)),
|
|
sk->sk_rcvtimeo);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* listen - allow socket to listen for incoming connections
|
|
* @sock: socket structure
|
|
* @len: (unused)
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
|
|
static int listen(struct socket *sock, int len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int res;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock->state == SS_READY)
|
|
res = -EOPNOTSUPP;
|
|
else if (sock->state != SS_UNCONNECTED)
|
|
res = -EINVAL;
|
|
else {
|
|
sock->state = SS_LISTENING;
|
|
res = 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* accept - wait for connection request
|
|
* @sock: listening socket
|
|
* @newsock: new socket that is to be connected
|
|
* @flags: file-related flags associated with socket
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
|
|
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_READY) {
|
|
res = -EOPNOTSUPP;
|
|
goto exit;
|
|
}
|
|
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->sk_sleep,
|
|
(!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);
|
|
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.
|
|
*/
|
|
|
|
msg_dbg(msg,"<ACC<: ");
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* shutdown - shutdown socket connection
|
|
* @sock: socket structure
|
|
* @how: direction to close (must be SHUT_RDWR)
|
|
*
|
|
* Terminates connection (if necessary), then purges socket's receive queue.
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
|
|
static int shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_port *tport = tipc_sk_port(sk);
|
|
struct sk_buff *buf;
|
|
int res;
|
|
|
|
if (how != SHUT_RDWR)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (sock->state) {
|
|
case SS_CONNECTING:
|
|
case SS_CONNECTED:
|
|
|
|
/* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
|
|
restart:
|
|
buf = __skb_dequeue(&sk->sk_receive_queue);
|
|
if (buf) {
|
|
atomic_dec(&tipc_queue_size);
|
|
if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
|
|
buf_discard(buf);
|
|
goto restart;
|
|
}
|
|
tipc_disconnect(tport->ref);
|
|
tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
|
|
} else {
|
|
tipc_shutdown(tport->ref);
|
|
}
|
|
|
|
sock->state = SS_DISCONNECTING;
|
|
|
|
/* fall through */
|
|
|
|
case SS_DISCONNECTING:
|
|
|
|
/* Discard any unreceived messages; wake up sleeping tasks */
|
|
|
|
discard_rx_queue(sk);
|
|
if (waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
res = 0;
|
|
break;
|
|
|
|
default:
|
|
res = -ENOTCONN;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* setsockopt - set socket option
|
|
* @sock: socket structure
|
|
* @lvl: option level
|
|
* @opt: option identifier
|
|
* @ov: pointer to new option value
|
|
* @ol: length of option value
|
|
*
|
|
* For stream sockets only, accepts and ignores all IPPROTO_TCP options
|
|
* (to ease compatibility).
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
|
|
static int setsockopt(struct socket *sock,
|
|
int lvl, int opt, char __user *ov, 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;
|
|
if ((res = get_user(value, (u32 __user *)ov)))
|
|
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:
|
|
sk->sk_rcvtimeo = msecs_to_jiffies(value);
|
|
/* no need to set "res", since already 0 at this point */
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* getsockopt - get socket option
|
|
* @sock: socket structure
|
|
* @lvl: option level
|
|
* @opt: option identifier
|
|
* @ov: receptacle for option value
|
|
* @ol: receptacle for length of option value
|
|
*
|
|
* For stream sockets only, returns 0 length result for all IPPROTO_TCP options
|
|
* (to ease compatibility).
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
|
|
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(sk->sk_rcvtimeo);
|
|
/* 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;
|
|
}
|
|
|
|
/**
|
|
* Protocol switches for the various types of TIPC sockets
|
|
*/
|
|
|
|
static const struct proto_ops msg_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = release,
|
|
.bind = bind,
|
|
.connect = connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = accept,
|
|
.getname = get_name,
|
|
.poll = poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = listen,
|
|
.shutdown = shutdown,
|
|
.setsockopt = setsockopt,
|
|
.getsockopt = getsockopt,
|
|
.sendmsg = send_msg,
|
|
.recvmsg = recv_msg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops packet_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = release,
|
|
.bind = bind,
|
|
.connect = connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = accept,
|
|
.getname = get_name,
|
|
.poll = poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = listen,
|
|
.shutdown = shutdown,
|
|
.setsockopt = setsockopt,
|
|
.getsockopt = getsockopt,
|
|
.sendmsg = send_packet,
|
|
.recvmsg = recv_msg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops stream_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = release,
|
|
.bind = bind,
|
|
.connect = connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = accept,
|
|
.getname = get_name,
|
|
.poll = poll,
|
|
.ioctl = sock_no_ioctl,
|
|
.listen = listen,
|
|
.shutdown = shutdown,
|
|
.setsockopt = setsockopt,
|
|
.getsockopt = getsockopt,
|
|
.sendmsg = send_stream,
|
|
.recvmsg = recv_stream,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct net_proto_family tipc_family_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.create = tipc_create
|
|
};
|
|
|
|
static struct proto tipc_proto = {
|
|
.name = "TIPC",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct tipc_sock)
|
|
};
|
|
|
|
/**
|
|
* tipc_socket_init - initialize TIPC socket interface
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
int tipc_socket_init(void)
|
|
{
|
|
int res;
|
|
|
|
res = proto_register(&tipc_proto, 1);
|
|
if (res) {
|
|
err("Failed to register TIPC protocol type\n");
|
|
goto out;
|
|
}
|
|
|
|
res = sock_register(&tipc_family_ops);
|
|
if (res) {
|
|
err("Failed to register TIPC socket type\n");
|
|
proto_unregister(&tipc_proto);
|
|
goto out;
|
|
}
|
|
|
|
sockets_enabled = 1;
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_socket_stop - stop TIPC socket interface
|
|
*/
|
|
|
|
void tipc_socket_stop(void)
|
|
{
|
|
if (!sockets_enabled)
|
|
return;
|
|
|
|
sockets_enabled = 0;
|
|
sock_unregister(tipc_family_ops.family);
|
|
proto_unregister(&tipc_proto);
|
|
}
|
|
|