mirror of https://gitee.com/openkylin/linux.git
2209 lines
55 KiB
C
2209 lines
55 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, 2012-2014, Ericsson AB
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* Copyright (c) 2004-2008, 2010-2013, 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 "core.h"
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#include "port.h"
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#include "name_table.h"
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#include "node.h"
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#include "link.h"
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#include <linux/export.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 CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
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#define TIPC_FWD_MSG 1
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static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
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static void tipc_data_ready(struct sock *sk);
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static void tipc_write_space(struct sock *sk);
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static int tipc_release(struct socket *sock);
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static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
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static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
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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 struct proto tipc_proto_kern;
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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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#include "socket.h"
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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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kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
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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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u32 dnode;
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while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
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if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
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tipc_link_xmit(buf, dnode, 0);
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}
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}
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/**
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* tipc_sk_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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* @kern: caused by kernel or by userspace?
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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_sk_create(struct net *net, struct socket *sock,
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int protocol, int kern)
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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_sock *tsk;
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struct tipc_port *port;
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u32 ref;
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/* Validate arguments */
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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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if (!kern)
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sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
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else
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sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
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if (sk == NULL)
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return -ENOMEM;
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tsk = tipc_sk(sk);
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port = &tsk->port;
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ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE);
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if (!ref) {
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pr_warn("Socket registration failed, ref. table exhausted\n");
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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_backlog_rcv = tipc_backlog_rcv;
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sk->sk_rcvbuf = sysctl_tipc_rmem[1];
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sk->sk_data_ready = tipc_data_ready;
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sk->sk_write_space = tipc_write_space;
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tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
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tsk->sent_unacked = 0;
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atomic_set(&tsk->dupl_rcvcnt, 0);
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tipc_port_unlock(port);
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if (sock->state == SS_READY) {
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tipc_port_set_unreturnable(port, true);
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if (sock->type == SOCK_DGRAM)
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tipc_port_set_unreliable(port, true);
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}
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return 0;
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}
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/**
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* tipc_sock_create_local - create TIPC socket from inside TIPC module
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* @type: socket type - SOCK_RDM or SOCK_SEQPACKET
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*
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* We cannot use sock_creat_kern here because it bumps module user count.
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* Since socket owner and creator is the same module we must make sure
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* that module count remains zero for module local sockets, otherwise
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* we cannot do rmmod.
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*
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* Returns 0 on success, errno otherwise
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*/
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int tipc_sock_create_local(int type, struct socket **res)
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{
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int rc;
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rc = sock_create_lite(AF_TIPC, type, 0, res);
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if (rc < 0) {
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pr_err("Failed to create kernel socket\n");
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return rc;
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}
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tipc_sk_create(&init_net, *res, 0, 1);
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return 0;
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}
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/**
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* tipc_sock_release_local - release socket created by tipc_sock_create_local
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* @sock: the socket to be released.
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*
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* Module reference count is not incremented when such sockets are created,
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* so we must keep it from being decremented when they are released.
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*/
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void tipc_sock_release_local(struct socket *sock)
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{
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tipc_release(sock);
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sock->ops = NULL;
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sock_release(sock);
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}
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/**
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* tipc_sock_accept_local - accept a connection on a socket created
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* with tipc_sock_create_local. Use this function to avoid that
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* module reference count is inadvertently incremented.
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*
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* @sock: the accepting socket
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* @newsock: reference to the new socket to be created
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* @flags: socket flags
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*/
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int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
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int flags)
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{
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struct sock *sk = sock->sk;
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int ret;
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ret = sock_create_lite(sk->sk_family, sk->sk_type,
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sk->sk_protocol, newsock);
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if (ret < 0)
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return ret;
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ret = tipc_accept(sock, *newsock, flags);
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if (ret < 0) {
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sock_release(*newsock);
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return ret;
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}
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(*newsock)->ops = sock->ops;
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return ret;
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}
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/**
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* tipc_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 tipc_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct tipc_sock *tsk;
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struct tipc_port *port;
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struct sk_buff *buf;
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u32 dnode;
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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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tsk = tipc_sk(sk);
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port = &tsk->port;
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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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if (TIPC_SKB_CB(buf)->handle != NULL)
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kfree_skb(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_port_disconnect(port->ref);
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}
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if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
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tipc_link_xmit(buf, dnode, 0);
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}
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}
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/* Destroy TIPC port; also disconnects an active connection and
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* sends a 'FIN-' to peer.
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*/
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tipc_port_destroy(port);
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/* Discard any remaining (connection-based) messages in receive queue */
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__skb_queue_purge(&sk->sk_receive_queue);
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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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return 0;
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}
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/**
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* tipc_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 tipc_bind(struct socket *sock, struct sockaddr *uaddr,
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int uaddr_len)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
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struct tipc_sock *tsk = tipc_sk(sk);
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int res = -EINVAL;
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lock_sock(sk);
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if (unlikely(!uaddr_len)) {
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res = tipc_withdraw(&tsk->port, 0, NULL);
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goto exit;
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}
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if (uaddr_len < sizeof(struct sockaddr_tipc)) {
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res = -EINVAL;
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goto exit;
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}
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if (addr->family != AF_TIPC) {
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res = -EAFNOSUPPORT;
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goto exit;
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}
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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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res = -EAFNOSUPPORT;
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goto exit;
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}
|
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if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
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(addr->addr.nameseq.type != TIPC_TOP_SRV) &&
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(addr->addr.nameseq.type != TIPC_CFG_SRV)) {
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res = -EACCES;
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goto exit;
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}
|
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|
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res = (addr->scope > 0) ?
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tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) :
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tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq);
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exit:
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release_sock(sk);
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return res;
|
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}
|
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|
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/**
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* tipc_getname - 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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*
|
|
* 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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static int tipc_getname(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 *tsk = tipc_sk(sock->sk);
|
|
|
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memset(addr, 0, sizeof(*addr));
|
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if (peer) {
|
|
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 = tipc_port_peerport(&tsk->port);
|
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addr->addr.id.node = tipc_port_peernode(&tsk->port);
|
|
} else {
|
|
addr->addr.id.ref = tsk->port.ref;
|
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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;
|
|
}
|
|
|
|
/**
|
|
* tipc_poll - read and possibly block on pollmask
|
|
* @file: file structure associated with the socket
|
|
* @sock: socket for which to calculate the poll bits
|
|
* @wait: ???
|
|
*
|
|
* Returns pollmask value
|
|
*
|
|
* COMMENTARY:
|
|
* It appears that the usual socket locking mechanisms are not useful here
|
|
* since the pollmask info is potentially out-of-date the moment this routine
|
|
* exits. TCP and other protocols seem to rely on higher level poll routines
|
|
* to handle any preventable race conditions, so TIPC will do the same ...
|
|
*
|
|
* TIPC sets the returned events as follows:
|
|
*
|
|
* socket state flags set
|
|
* ------------ ---------
|
|
* unconnected no read flags
|
|
* POLLOUT if port is not congested
|
|
*
|
|
* connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
|
|
* no write flags
|
|
*
|
|
* connected POLLIN/POLLRDNORM if data in rx queue
|
|
* POLLOUT if port is not congested
|
|
*
|
|
* disconnecting POLLIN/POLLRDNORM/POLLHUP
|
|
* no write flags
|
|
*
|
|
* listening POLLIN if SYN in rx queue
|
|
* no write flags
|
|
*
|
|
* ready POLLIN/POLLRDNORM if data in rx queue
|
|
* [connectionless] POLLOUT (since port cannot be congested)
|
|
*
|
|
* IMPORTANT: The fact that a read or write operation is indicated does NOT
|
|
* imply that the operation will succeed, merely that it should be performed
|
|
* and will not block.
|
|
*/
|
|
static unsigned int tipc_poll(struct file *file, struct socket *sock,
|
|
poll_table *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
u32 mask = 0;
|
|
|
|
sock_poll_wait(file, sk_sleep(sk), wait);
|
|
|
|
switch ((int)sock->state) {
|
|
case SS_UNCONNECTED:
|
|
if (!tsk->link_cong)
|
|
mask |= POLLOUT;
|
|
break;
|
|
case SS_READY:
|
|
case SS_CONNECTED:
|
|
if (!tsk->link_cong && !tipc_sk_conn_cong(tsk))
|
|
mask |= POLLOUT;
|
|
/* fall thru' */
|
|
case SS_CONNECTING:
|
|
case SS_LISTENING:
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
mask |= (POLLIN | POLLRDNORM);
|
|
break;
|
|
case SS_DISCONNECTING:
|
|
mask = (POLLIN | POLLRDNORM | POLLHUP);
|
|
break;
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
/**
|
|
* tipc_sendmcast - send multicast message
|
|
* @sock: socket structure
|
|
* @seq: destination address
|
|
* @iov: message data to send
|
|
* @dsz: total length of message data
|
|
* @timeo: timeout to wait for wakeup
|
|
*
|
|
* Called from function tipc_sendmsg(), which has done all sanity checks
|
|
* Returns the number of bytes sent on success, or errno
|
|
*/
|
|
static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
|
|
struct iovec *iov, size_t dsz, long timeo)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_msg *mhdr = &tipc_sk(sk)->port.phdr;
|
|
struct sk_buff *buf;
|
|
uint mtu;
|
|
int rc;
|
|
|
|
msg_set_type(mhdr, TIPC_MCAST_MSG);
|
|
msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
|
|
msg_set_destport(mhdr, 0);
|
|
msg_set_destnode(mhdr, 0);
|
|
msg_set_nametype(mhdr, seq->type);
|
|
msg_set_namelower(mhdr, seq->lower);
|
|
msg_set_nameupper(mhdr, seq->upper);
|
|
msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
|
|
|
|
new_mtu:
|
|
mtu = tipc_bclink_get_mtu();
|
|
rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
|
|
if (unlikely(rc < 0))
|
|
return rc;
|
|
|
|
do {
|
|
rc = tipc_bclink_xmit(buf);
|
|
if (likely(rc >= 0)) {
|
|
rc = dsz;
|
|
break;
|
|
}
|
|
if (rc == -EMSGSIZE)
|
|
goto new_mtu;
|
|
if (rc != -ELINKCONG)
|
|
break;
|
|
rc = tipc_wait_for_sndmsg(sock, &timeo);
|
|
if (rc)
|
|
kfree_skb_list(buf);
|
|
} while (!rc);
|
|
return rc;
|
|
}
|
|
|
|
/* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets
|
|
*/
|
|
void tipc_sk_mcast_rcv(struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
struct tipc_port_list dports = {0, NULL, };
|
|
struct tipc_port_list *item;
|
|
struct sk_buff *b;
|
|
uint i, last, dst = 0;
|
|
u32 scope = TIPC_CLUSTER_SCOPE;
|
|
|
|
if (in_own_node(msg_orignode(msg)))
|
|
scope = TIPC_NODE_SCOPE;
|
|
|
|
/* Create destination port list: */
|
|
tipc_nametbl_mc_translate(msg_nametype(msg),
|
|
msg_namelower(msg),
|
|
msg_nameupper(msg),
|
|
scope,
|
|
&dports);
|
|
last = dports.count;
|
|
if (!last) {
|
|
kfree_skb(buf);
|
|
return;
|
|
}
|
|
|
|
for (item = &dports; item; item = item->next) {
|
|
for (i = 0; i < PLSIZE && ++dst <= last; i++) {
|
|
b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf;
|
|
if (!b) {
|
|
pr_warn("Failed do clone mcast rcv buffer\n");
|
|
continue;
|
|
}
|
|
msg_set_destport(msg, item->ports[i]);
|
|
tipc_sk_rcv(b);
|
|
}
|
|
}
|
|
tipc_port_list_free(&dports);
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_proto_rcv - receive a connection mng protocol message
|
|
* @tsk: receiving socket
|
|
* @dnode: node to send response message to, if any
|
|
* @buf: buffer containing protocol message
|
|
* Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if
|
|
* (CONN_PROBE_REPLY) message should be forwarded.
|
|
*/
|
|
static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
|
|
struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
struct tipc_port *port = &tsk->port;
|
|
int conn_cong;
|
|
|
|
/* Ignore if connection cannot be validated: */
|
|
if (!port->connected || !tipc_port_peer_msg(port, msg))
|
|
goto exit;
|
|
|
|
port->probing_state = TIPC_CONN_OK;
|
|
|
|
if (msg_type(msg) == CONN_ACK) {
|
|
conn_cong = tipc_sk_conn_cong(tsk);
|
|
tsk->sent_unacked -= msg_msgcnt(msg);
|
|
if (conn_cong)
|
|
tipc_sock_wakeup(tsk);
|
|
} else if (msg_type(msg) == CONN_PROBE) {
|
|
if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
|
|
return TIPC_OK;
|
|
msg_set_type(msg, CONN_PROBE_REPLY);
|
|
return TIPC_FWD_MSG;
|
|
}
|
|
/* Do nothing if msg_type() == CONN_PROBE_REPLY */
|
|
exit:
|
|
kfree_skb(buf);
|
|
return TIPC_OK;
|
|
}
|
|
|
|
/**
|
|
* dest_name_check - verify user is permitted to send to specified port name
|
|
* @dest: destination address
|
|
* @m: descriptor for message to be sent
|
|
*
|
|
* Prevents restricted configuration commands from being issued by
|
|
* unauthorized users.
|
|
*
|
|
* Returns 0 if permission is granted, otherwise errno
|
|
*/
|
|
static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
|
|
{
|
|
struct tipc_cfg_msg_hdr hdr;
|
|
|
|
if (unlikely(dest->addrtype == TIPC_ADDR_ID))
|
|
return 0;
|
|
if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
|
|
return 0;
|
|
if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
|
|
return 0;
|
|
if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
|
|
return -EACCES;
|
|
|
|
if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
|
|
return -EMSGSIZE;
|
|
if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
|
|
return -EFAULT;
|
|
if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
|
|
return -EACCES;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
DEFINE_WAIT(wait);
|
|
int done;
|
|
|
|
do {
|
|
int err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
if (sock->state == SS_DISCONNECTING)
|
|
return -EPIPE;
|
|
if (!*timeo_p)
|
|
return -EAGAIN;
|
|
if (signal_pending(current))
|
|
return sock_intr_errno(*timeo_p);
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
} while (!done);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_sendmsg - send message in connectionless manner
|
|
* @iocb: if NULL, indicates that socket lock is already held
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dsz: amount of user data to be sent
|
|
*
|
|
* Message must have an destination specified explicitly.
|
|
* 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 tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t dsz)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
struct tipc_msg *mhdr = &port->phdr;
|
|
struct iovec *iov = m->msg_iov;
|
|
u32 dnode, dport;
|
|
struct sk_buff *buf;
|
|
struct tipc_name_seq *seq = &dest->addr.nameseq;
|
|
u32 mtu;
|
|
long timeo;
|
|
int rc = -EINVAL;
|
|
|
|
if (unlikely(!dest))
|
|
return -EDESTADDRREQ;
|
|
|
|
if (unlikely((m->msg_namelen < sizeof(*dest)) ||
|
|
(dest->family != AF_TIPC)))
|
|
return -EINVAL;
|
|
|
|
if (dsz > TIPC_MAX_USER_MSG_SIZE)
|
|
return -EMSGSIZE;
|
|
|
|
if (iocb)
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sock->state != SS_READY)) {
|
|
if (sock->state == SS_LISTENING) {
|
|
rc = -EPIPE;
|
|
goto exit;
|
|
}
|
|
if (sock->state != SS_UNCONNECTED) {
|
|
rc = -EISCONN;
|
|
goto exit;
|
|
}
|
|
if (tsk->port.published) {
|
|
rc = -EOPNOTSUPP;
|
|
goto exit;
|
|
}
|
|
if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
tsk->port.conn_type = dest->addr.name.name.type;
|
|
tsk->port.conn_instance = dest->addr.name.name.instance;
|
|
}
|
|
}
|
|
rc = dest_name_check(dest, m);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
|
|
|
|
if (dest->addrtype == TIPC_ADDR_MCAST) {
|
|
rc = tipc_sendmcast(sock, seq, iov, dsz, timeo);
|
|
goto exit;
|
|
} else if (dest->addrtype == TIPC_ADDR_NAME) {
|
|
u32 type = dest->addr.name.name.type;
|
|
u32 inst = dest->addr.name.name.instance;
|
|
u32 domain = dest->addr.name.domain;
|
|
|
|
dnode = domain;
|
|
msg_set_type(mhdr, TIPC_NAMED_MSG);
|
|
msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
|
|
msg_set_nametype(mhdr, type);
|
|
msg_set_nameinst(mhdr, inst);
|
|
msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
|
|
dport = tipc_nametbl_translate(type, inst, &dnode);
|
|
msg_set_destnode(mhdr, dnode);
|
|
msg_set_destport(mhdr, dport);
|
|
if (unlikely(!dport && !dnode)) {
|
|
rc = -EHOSTUNREACH;
|
|
goto exit;
|
|
}
|
|
} else if (dest->addrtype == TIPC_ADDR_ID) {
|
|
dnode = dest->addr.id.node;
|
|
msg_set_type(mhdr, TIPC_DIRECT_MSG);
|
|
msg_set_lookup_scope(mhdr, 0);
|
|
msg_set_destnode(mhdr, dnode);
|
|
msg_set_destport(mhdr, dest->addr.id.ref);
|
|
msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
|
|
}
|
|
|
|
new_mtu:
|
|
mtu = tipc_node_get_mtu(dnode, tsk->port.ref);
|
|
rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
|
|
if (rc < 0)
|
|
goto exit;
|
|
|
|
do {
|
|
rc = tipc_link_xmit(buf, dnode, tsk->port.ref);
|
|
if (likely(rc >= 0)) {
|
|
if (sock->state != SS_READY)
|
|
sock->state = SS_CONNECTING;
|
|
rc = dsz;
|
|
break;
|
|
}
|
|
if (rc == -EMSGSIZE)
|
|
goto new_mtu;
|
|
|
|
if (rc != -ELINKCONG)
|
|
break;
|
|
|
|
rc = tipc_wait_for_sndmsg(sock, &timeo);
|
|
if (rc)
|
|
kfree_skb_list(buf);
|
|
} while (!rc);
|
|
exit:
|
|
if (iocb)
|
|
release_sock(sk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
DEFINE_WAIT(wait);
|
|
int done;
|
|
|
|
do {
|
|
int err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
if (sock->state == SS_DISCONNECTING)
|
|
return -EPIPE;
|
|
else if (sock->state != SS_CONNECTED)
|
|
return -ENOTCONN;
|
|
if (!*timeo_p)
|
|
return -EAGAIN;
|
|
if (signal_pending(current))
|
|
return sock_intr_errno(*timeo_p);
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
done = sk_wait_event(sk, timeo_p,
|
|
(!tsk->link_cong &&
|
|
!tipc_sk_conn_cong(tsk)) ||
|
|
!tsk->port.connected);
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
} while (!done);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_stream - send stream-oriented data
|
|
* @iocb: (unused)
|
|
* @sock: socket structure
|
|
* @m: data to send
|
|
* @dsz: total length of data to be transmitted
|
|
*
|
|
* Used for SOCK_STREAM data.
|
|
*
|
|
* Returns the number of bytes sent on success (or partial success),
|
|
* or errno if no data sent
|
|
*/
|
|
static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t dsz)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
struct tipc_msg *mhdr = &port->phdr;
|
|
struct sk_buff *buf;
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
|
|
u32 ref = port->ref;
|
|
int rc = -EINVAL;
|
|
long timeo;
|
|
u32 dnode;
|
|
uint mtu, send, sent = 0;
|
|
|
|
/* Handle implied connection establishment */
|
|
if (unlikely(dest)) {
|
|
rc = tipc_sendmsg(iocb, sock, m, dsz);
|
|
if (dsz && (dsz == rc))
|
|
tsk->sent_unacked = 1;
|
|
return rc;
|
|
}
|
|
if (dsz > (uint)INT_MAX)
|
|
return -EMSGSIZE;
|
|
|
|
if (iocb)
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sock->state != SS_CONNECTED)) {
|
|
if (sock->state == SS_DISCONNECTING)
|
|
rc = -EPIPE;
|
|
else
|
|
rc = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
|
|
timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
|
|
dnode = tipc_port_peernode(port);
|
|
|
|
next:
|
|
mtu = port->max_pkt;
|
|
send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
|
|
rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf);
|
|
if (unlikely(rc < 0))
|
|
goto exit;
|
|
do {
|
|
if (likely(!tipc_sk_conn_cong(tsk))) {
|
|
rc = tipc_link_xmit(buf, dnode, ref);
|
|
if (likely(!rc)) {
|
|
tsk->sent_unacked++;
|
|
sent += send;
|
|
if (sent == dsz)
|
|
break;
|
|
goto next;
|
|
}
|
|
if (rc == -EMSGSIZE) {
|
|
port->max_pkt = tipc_node_get_mtu(dnode, ref);
|
|
goto next;
|
|
}
|
|
if (rc != -ELINKCONG)
|
|
break;
|
|
}
|
|
rc = tipc_wait_for_sndpkt(sock, &timeo);
|
|
if (rc)
|
|
kfree_skb_list(buf);
|
|
} while (!rc);
|
|
exit:
|
|
if (iocb)
|
|
release_sock(sk);
|
|
return sent ? sent : rc;
|
|
}
|
|
|
|
/**
|
|
* tipc_send_packet - send a connection-oriented message
|
|
* @iocb: if NULL, indicates that socket lock is already held
|
|
* @sock: socket structure
|
|
* @m: message to send
|
|
* @dsz: length of data to be transmitted
|
|
*
|
|
* Used for SOCK_SEQPACKET messages.
|
|
*
|
|
* Returns the number of bytes sent on success, or errno otherwise
|
|
*/
|
|
static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t dsz)
|
|
{
|
|
if (dsz > TIPC_MAX_USER_MSG_SIZE)
|
|
return -EMSGSIZE;
|
|
|
|
return tipc_send_stream(iocb, sock, m, dsz);
|
|
}
|
|
|
|
/**
|
|
* auto_connect - complete connection setup to a remote port
|
|
* @tsk: tipc socket structure
|
|
* @msg: peer's response message
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg)
|
|
{
|
|
struct tipc_port *port = &tsk->port;
|
|
struct socket *sock = tsk->sk.sk_socket;
|
|
struct tipc_portid peer;
|
|
|
|
peer.ref = msg_origport(msg);
|
|
peer.node = msg_orignode(msg);
|
|
|
|
__tipc_port_connect(port->ref, port, &peer);
|
|
|
|
if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
|
|
return -EINVAL;
|
|
msg_set_importance(&port->phdr, (u32)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)
|
|
{
|
|
DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
|
|
|
|
if (addr) {
|
|
addr->family = AF_TIPC;
|
|
addr->addrtype = TIPC_ADDR_ID;
|
|
memset(&addr->addr, 0, sizeof(addr->addr));
|
|
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);
|
|
res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
|
|
if (res)
|
|
return res;
|
|
if (anc_data[1]) {
|
|
res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
|
|
msg_data(msg));
|
|
if (res)
|
|
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);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DEFINE_WAIT(wait);
|
|
long timeo = *timeop;
|
|
int err;
|
|
|
|
for (;;) {
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
|
|
if (sock->state == SS_DISCONNECTING) {
|
|
err = -ENOTCONN;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
}
|
|
err = 0;
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
break;
|
|
err = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
break;
|
|
err = -EAGAIN;
|
|
if (!timeo)
|
|
break;
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
*timeop = timeo;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* tipc_recvmsg - 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 tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t buf_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
struct sk_buff *buf;
|
|
struct tipc_msg *msg;
|
|
long timeo;
|
|
unsigned int sz;
|
|
u32 err;
|
|
int res;
|
|
|
|
/* Catch invalid receive requests */
|
|
if (unlikely(!buf_len))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sock->state == SS_UNCONNECTED)) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
restart:
|
|
|
|
/* Look for a message in receive queue; wait if necessary */
|
|
res = tipc_wait_for_rcvmsg(sock, &timeo);
|
|
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;
|
|
}
|
|
|
|
/* Capture sender's address (optional) */
|
|
set_orig_addr(m, msg);
|
|
|
|
/* Capture ancillary data (optional) */
|
|
res = anc_data_recv(m, msg, port);
|
|
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;
|
|
}
|
|
res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
|
|
m->msg_iov, sz);
|
|
if (res)
|
|
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) &&
|
|
(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
|
|
tipc_acknowledge(port->ref, tsk->rcv_unacked);
|
|
tsk->rcv_unacked = 0;
|
|
}
|
|
advance_rx_queue(sk);
|
|
}
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *m, size_t buf_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
struct sk_buff *buf;
|
|
struct tipc_msg *msg;
|
|
long timeo;
|
|
unsigned int sz;
|
|
int sz_to_copy, target, needed;
|
|
int sz_copied = 0;
|
|
u32 err;
|
|
int res = 0;
|
|
|
|
/* Catch invalid receive attempts */
|
|
if (unlikely(!buf_len))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(sock->state == SS_UNCONNECTED)) {
|
|
res = -ENOTCONN;
|
|
goto exit;
|
|
}
|
|
|
|
target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
|
|
restart:
|
|
/* Look for a message in receive queue; wait if necessary */
|
|
res = tipc_wait_for_rcvmsg(sock, &timeo);
|
|
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, port);
|
|
if (res)
|
|
goto exit;
|
|
}
|
|
|
|
/* Capture message data (if valid) & compute return value (always) */
|
|
if (!err) {
|
|
u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
|
|
|
|
sz -= offset;
|
|
needed = (buf_len - sz_copied);
|
|
sz_to_copy = (sz <= needed) ? sz : needed;
|
|
|
|
res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
|
|
m->msg_iov, sz_to_copy);
|
|
if (res)
|
|
goto exit;
|
|
|
|
sz_copied += sz_to_copy;
|
|
|
|
if (sz_to_copy < sz) {
|
|
if (!(flags & MSG_PEEK))
|
|
TIPC_SKB_CB(buf)->handle =
|
|
(void *)(unsigned long)(offset + sz_to_copy);
|
|
goto exit;
|
|
}
|
|
} 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(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
|
|
tipc_acknowledge(port->ref, tsk->rcv_unacked);
|
|
tsk->rcv_unacked = 0;
|
|
}
|
|
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) ||
|
|
(sz_copied < target)) && /* 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;
|
|
}
|
|
|
|
/**
|
|
* tipc_write_space - wake up thread if port congestion is released
|
|
* @sk: socket
|
|
*/
|
|
static void tipc_write_space(struct sock *sk)
|
|
{
|
|
struct socket_wq *wq;
|
|
|
|
rcu_read_lock();
|
|
wq = rcu_dereference(sk->sk_wq);
|
|
if (wq_has_sleeper(wq))
|
|
wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
|
|
POLLWRNORM | POLLWRBAND);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* tipc_data_ready - wake up threads to indicate messages have been received
|
|
* @sk: socket
|
|
* @len: the length of messages
|
|
*/
|
|
static void tipc_data_ready(struct sock *sk)
|
|
{
|
|
struct socket_wq *wq;
|
|
|
|
rcu_read_lock();
|
|
wq = rcu_dereference(sk->sk_wq);
|
|
if (wq_has_sleeper(wq))
|
|
wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
|
|
POLLRDNORM | POLLRDBAND);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* filter_connect - Handle all incoming messages for a connection-based socket
|
|
* @tsk: TIPC socket
|
|
* @msg: message
|
|
*
|
|
* Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise
|
|
*/
|
|
static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
|
|
{
|
|
struct sock *sk = &tsk->sk;
|
|
struct tipc_port *port = &tsk->port;
|
|
struct socket *sock = sk->sk_socket;
|
|
struct tipc_msg *msg = buf_msg(*buf);
|
|
|
|
int retval = -TIPC_ERR_NO_PORT;
|
|
int res;
|
|
|
|
if (msg_mcast(msg))
|
|
return retval;
|
|
|
|
switch ((int)sock->state) {
|
|
case SS_CONNECTED:
|
|
/* Accept only connection-based messages sent by peer */
|
|
if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {
|
|
if (unlikely(msg_errcode(msg))) {
|
|
sock->state = SS_DISCONNECTING;
|
|
__tipc_port_disconnect(port);
|
|
}
|
|
retval = TIPC_OK;
|
|
}
|
|
break;
|
|
case SS_CONNECTING:
|
|
/* Accept only ACK or NACK message */
|
|
if (unlikely(msg_errcode(msg))) {
|
|
sock->state = SS_DISCONNECTING;
|
|
sk->sk_err = ECONNREFUSED;
|
|
retval = TIPC_OK;
|
|
break;
|
|
}
|
|
|
|
if (unlikely(!msg_connected(msg)))
|
|
break;
|
|
|
|
res = auto_connect(tsk, msg);
|
|
if (res) {
|
|
sock->state = SS_DISCONNECTING;
|
|
sk->sk_err = -res;
|
|
retval = TIPC_OK;
|
|
break;
|
|
}
|
|
|
|
/* If an incoming message is an 'ACK-', it should be
|
|
* discarded here because it doesn't contain useful
|
|
* data. In addition, we should try to wake up
|
|
* connect() routine if sleeping.
|
|
*/
|
|
if (msg_data_sz(msg) == 0) {
|
|
kfree_skb(*buf);
|
|
*buf = NULL;
|
|
if (waitqueue_active(sk_sleep(sk)))
|
|
wake_up_interruptible(sk_sleep(sk));
|
|
}
|
|
retval = TIPC_OK;
|
|
break;
|
|
case SS_LISTENING:
|
|
case SS_UNCONNECTED:
|
|
/* Accept only SYN message */
|
|
if (!msg_connected(msg) && !(msg_errcode(msg)))
|
|
retval = TIPC_OK;
|
|
break;
|
|
case SS_DISCONNECTING:
|
|
break;
|
|
default:
|
|
pr_err("Unknown socket state %u\n", sock->state);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* rcvbuf_limit - get proper overload limit of socket receive queue
|
|
* @sk: socket
|
|
* @buf: message
|
|
*
|
|
* For all connection oriented messages, irrespective of importance,
|
|
* the default overload value (i.e. 67MB) is set as limit.
|
|
*
|
|
* For all connectionless messages, by default new queue limits are
|
|
* as belows:
|
|
*
|
|
* TIPC_LOW_IMPORTANCE (4 MB)
|
|
* TIPC_MEDIUM_IMPORTANCE (8 MB)
|
|
* TIPC_HIGH_IMPORTANCE (16 MB)
|
|
* TIPC_CRITICAL_IMPORTANCE (32 MB)
|
|
*
|
|
* Returns overload limit according to corresponding message importance
|
|
*/
|
|
static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
if (msg_connected(msg))
|
|
return sysctl_tipc_rmem[2];
|
|
|
|
return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
|
|
msg_importance(msg);
|
|
}
|
|
|
|
/**
|
|
* 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 0 (TIPC_OK) if message was consumed, -TIPC error code if message
|
|
* to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
|
|
*/
|
|
static int filter_rcv(struct sock *sk, struct sk_buff *buf)
|
|
{
|
|
struct socket *sock = sk->sk_socket;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
unsigned int limit = rcvbuf_limit(sk, buf);
|
|
u32 onode;
|
|
int rc = TIPC_OK;
|
|
|
|
if (unlikely(msg_user(msg) == CONN_MANAGER))
|
|
return tipc_sk_proto_rcv(tsk, &onode, buf);
|
|
|
|
/* 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 {
|
|
rc = filter_connect(tsk, &buf);
|
|
if (rc != TIPC_OK || buf == NULL)
|
|
return rc;
|
|
}
|
|
|
|
/* 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 = NULL;
|
|
__skb_queue_tail(&sk->sk_receive_queue, buf);
|
|
skb_set_owner_r(buf, sk);
|
|
|
|
sk->sk_data_ready(sk);
|
|
return TIPC_OK;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf)
|
|
{
|
|
int rc;
|
|
u32 onode;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
uint truesize = buf->truesize;
|
|
|
|
rc = filter_rcv(sk, buf);
|
|
|
|
if (likely(!rc)) {
|
|
if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
|
|
atomic_add(truesize, &tsk->dupl_rcvcnt);
|
|
return 0;
|
|
}
|
|
|
|
if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc))
|
|
return 0;
|
|
|
|
tipc_link_xmit(buf, onode, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_sk_rcv - handle incoming message
|
|
* @buf: buffer containing arriving message
|
|
* Consumes buffer
|
|
* Returns 0 if success, or errno: -EHOSTUNREACH
|
|
*/
|
|
int tipc_sk_rcv(struct sk_buff *buf)
|
|
{
|
|
struct tipc_sock *tsk;
|
|
struct tipc_port *port;
|
|
struct sock *sk;
|
|
u32 dport = msg_destport(buf_msg(buf));
|
|
int rc = TIPC_OK;
|
|
uint limit;
|
|
u32 dnode;
|
|
|
|
/* Validate destination and message */
|
|
port = tipc_port_lock(dport);
|
|
if (unlikely(!port)) {
|
|
rc = tipc_msg_eval(buf, &dnode);
|
|
goto exit;
|
|
}
|
|
|
|
tsk = tipc_port_to_sock(port);
|
|
sk = &tsk->sk;
|
|
|
|
/* Queue message */
|
|
bh_lock_sock(sk);
|
|
|
|
if (!sock_owned_by_user(sk)) {
|
|
rc = filter_rcv(sk, buf);
|
|
} else {
|
|
if (sk->sk_backlog.len == 0)
|
|
atomic_set(&tsk->dupl_rcvcnt, 0);
|
|
limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt);
|
|
if (sk_add_backlog(sk, buf, limit))
|
|
rc = -TIPC_ERR_OVERLOAD;
|
|
}
|
|
bh_unlock_sock(sk);
|
|
tipc_port_unlock(port);
|
|
|
|
if (likely(!rc))
|
|
return 0;
|
|
exit:
|
|
if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc))
|
|
return -EHOSTUNREACH;
|
|
|
|
tipc_link_xmit(buf, dnode, 0);
|
|
return (rc < 0) ? -EHOSTUNREACH : 0;
|
|
}
|
|
|
|
static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DEFINE_WAIT(wait);
|
|
int done;
|
|
|
|
do {
|
|
int err = sock_error(sk);
|
|
if (err)
|
|
return err;
|
|
if (!*timeo_p)
|
|
return -ETIMEDOUT;
|
|
if (signal_pending(current))
|
|
return sock_intr_errno(*timeo_p);
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
} while (!done);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_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,};
|
|
long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
|
|
socket_state previous;
|
|
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;
|
|
}
|
|
|
|
previous = sock->state;
|
|
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 = tipc_sendmsg(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;
|
|
case SS_CONNECTING:
|
|
if (previous == SS_CONNECTING)
|
|
res = -EALREADY;
|
|
if (!timeout)
|
|
goto exit;
|
|
timeout = msecs_to_jiffies(timeout);
|
|
/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
|
|
res = tipc_wait_for_connect(sock, &timeout);
|
|
break;
|
|
case SS_CONNECTED:
|
|
res = -EISCONN;
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
break;
|
|
}
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_listen - allow socket to listen for incoming connections
|
|
* @sock: socket structure
|
|
* @len: (unused)
|
|
*
|
|
* Returns 0 on success, errno otherwise
|
|
*/
|
|
static int tipc_listen(struct socket *sock, int len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int res;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock->state != SS_UNCONNECTED)
|
|
res = -EINVAL;
|
|
else {
|
|
sock->state = SS_LISTENING;
|
|
res = 0;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
static int tipc_wait_for_accept(struct socket *sock, long timeo)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
DEFINE_WAIT(wait);
|
|
int err;
|
|
|
|
/* True wake-one mechanism for incoming connections: only
|
|
* one process gets woken up, not the 'whole herd'.
|
|
* Since we do not 'race & poll' for established sockets
|
|
* anymore, the common case will execute the loop only once.
|
|
*/
|
|
for (;;) {
|
|
prepare_to_wait_exclusive(sk_sleep(sk), &wait,
|
|
TASK_INTERRUPTIBLE);
|
|
if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
}
|
|
err = 0;
|
|
if (!skb_queue_empty(&sk->sk_receive_queue))
|
|
break;
|
|
err = -EINVAL;
|
|
if (sock->state != SS_LISTENING)
|
|
break;
|
|
err = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
break;
|
|
err = -EAGAIN;
|
|
if (!timeo)
|
|
break;
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
|
|
{
|
|
struct sock *new_sk, *sk = sock->sk;
|
|
struct sk_buff *buf;
|
|
struct tipc_port *new_port;
|
|
struct tipc_msg *msg;
|
|
struct tipc_portid peer;
|
|
u32 new_ref;
|
|
long timeo;
|
|
int res;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (sock->state != SS_LISTENING) {
|
|
res = -EINVAL;
|
|
goto exit;
|
|
}
|
|
timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
|
|
res = tipc_wait_for_accept(sock, timeo);
|
|
if (res)
|
|
goto exit;
|
|
|
|
buf = skb_peek(&sk->sk_receive_queue);
|
|
|
|
res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
|
|
if (res)
|
|
goto exit;
|
|
|
|
new_sk = new_sock->sk;
|
|
new_port = &tipc_sk(new_sk)->port;
|
|
new_ref = new_port->ref;
|
|
msg = buf_msg(buf);
|
|
|
|
/* we lock on new_sk; but lockdep sees the lock on sk */
|
|
lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
|
|
|
|
/*
|
|
* 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 */
|
|
peer.ref = msg_origport(msg);
|
|
peer.node = msg_orignode(msg);
|
|
tipc_port_connect(new_ref, &peer);
|
|
new_sock->state = SS_CONNECTED;
|
|
|
|
tipc_port_set_importance(new_port, msg_importance(msg));
|
|
if (msg_named(msg)) {
|
|
new_port->conn_type = msg_nametype(msg);
|
|
new_port->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);
|
|
tipc_send_packet(NULL, new_sock, &m, 0);
|
|
} else {
|
|
__skb_dequeue(&sk->sk_receive_queue);
|
|
__skb_queue_head(&new_sk->sk_receive_queue, buf);
|
|
skb_set_owner_r(buf, new_sk);
|
|
}
|
|
release_sock(new_sk);
|
|
exit:
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
struct sk_buff *buf;
|
|
u32 peer;
|
|
int res;
|
|
|
|
if (how != SHUT_RDWR)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (sock->state) {
|
|
case SS_CONNECTING:
|
|
case SS_CONNECTED:
|
|
|
|
restart:
|
|
/* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
|
|
buf = __skb_dequeue(&sk->sk_receive_queue);
|
|
if (buf) {
|
|
if (TIPC_SKB_CB(buf)->handle != NULL) {
|
|
kfree_skb(buf);
|
|
goto restart;
|
|
}
|
|
tipc_port_disconnect(port->ref);
|
|
if (tipc_msg_reverse(buf, &peer, TIPC_CONN_SHUTDOWN))
|
|
tipc_link_xmit(buf, peer, 0);
|
|
} else {
|
|
tipc_port_shutdown(port->ref);
|
|
}
|
|
|
|
sock->state = SS_DISCONNECTING;
|
|
|
|
/* fall through */
|
|
|
|
case SS_DISCONNECTING:
|
|
|
|
/* Discard any unreceived messages */
|
|
__skb_queue_purge(&sk->sk_receive_queue);
|
|
|
|
/* Wake up anyone sleeping in poll */
|
|
sk->sk_state_change(sk);
|
|
res = 0;
|
|
break;
|
|
|
|
default:
|
|
res = -ENOTCONN;
|
|
}
|
|
|
|
release_sock(sk);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_setsockopt(struct socket *sock, int lvl, int opt,
|
|
char __user *ov, unsigned int ol)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
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_port_set_importance(port, value);
|
|
break;
|
|
case TIPC_SRC_DROPPABLE:
|
|
if (sock->type != SOCK_STREAM)
|
|
tipc_port_set_unreliable(port, value);
|
|
else
|
|
res = -ENOPROTOOPT;
|
|
break;
|
|
case TIPC_DEST_DROPPABLE:
|
|
tipc_port_set_unreturnable(port, 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;
|
|
}
|
|
|
|
/**
|
|
* tipc_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 tipc_getsockopt(struct socket *sock, int lvl, int opt,
|
|
char __user *ov, int __user *ol)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct tipc_sock *tsk = tipc_sk(sk);
|
|
struct tipc_port *port = &tsk->port;
|
|
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;
|
|
res = get_user(len, ol);
|
|
if (res)
|
|
return res;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch (opt) {
|
|
case TIPC_IMPORTANCE:
|
|
value = tipc_port_importance(port);
|
|
break;
|
|
case TIPC_SRC_DROPPABLE:
|
|
value = tipc_port_unreliable(port);
|
|
break;
|
|
case TIPC_DEST_DROPPABLE:
|
|
value = tipc_port_unreturnable(port);
|
|
break;
|
|
case TIPC_CONN_TIMEOUT:
|
|
value = tipc_sk(sk)->conn_timeout;
|
|
/* no need to set "res", since already 0 at this point */
|
|
break;
|
|
case TIPC_NODE_RECVQ_DEPTH:
|
|
value = 0; /* was tipc_queue_size, now obsolete */
|
|
break;
|
|
case TIPC_SOCK_RECVQ_DEPTH:
|
|
value = skb_queue_len(&sk->sk_receive_queue);
|
|
break;
|
|
default:
|
|
res = -EINVAL;
|
|
}
|
|
|
|
release_sock(sk);
|
|
|
|
if (res)
|
|
return res; /* "get" failed */
|
|
|
|
if (len < sizeof(value))
|
|
return -EINVAL;
|
|
|
|
if (copy_to_user(ov, &value, sizeof(value)))
|
|
return -EFAULT;
|
|
|
|
return put_user(sizeof(value), ol);
|
|
}
|
|
|
|
static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tipc_sioc_ln_req lnr;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETLINKNAME:
|
|
if (copy_from_user(&lnr, argp, sizeof(lnr)))
|
|
return -EFAULT;
|
|
if (!tipc_node_get_linkname(lnr.bearer_id, lnr.peer,
|
|
lnr.linkname, TIPC_MAX_LINK_NAME)) {
|
|
if (copy_to_user(argp, &lnr, sizeof(lnr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
/* Protocol switches for the various types of TIPC sockets */
|
|
|
|
static const struct proto_ops msg_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_sendmsg,
|
|
.recvmsg = tipc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops packet_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = tipc_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = tipc_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_send_packet,
|
|
.recvmsg = tipc_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage
|
|
};
|
|
|
|
static const struct proto_ops stream_ops = {
|
|
.owner = THIS_MODULE,
|
|
.family = AF_TIPC,
|
|
.release = tipc_release,
|
|
.bind = tipc_bind,
|
|
.connect = tipc_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = tipc_accept,
|
|
.getname = tipc_getname,
|
|
.poll = tipc_poll,
|
|
.ioctl = tipc_ioctl,
|
|
.listen = tipc_listen,
|
|
.shutdown = tipc_shutdown,
|
|
.setsockopt = tipc_setsockopt,
|
|
.getsockopt = tipc_getsockopt,
|
|
.sendmsg = tipc_send_stream,
|
|
.recvmsg = tipc_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_sk_create
|
|
};
|
|
|
|
static struct proto tipc_proto = {
|
|
.name = "TIPC",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct tipc_sock),
|
|
.sysctl_rmem = sysctl_tipc_rmem
|
|
};
|
|
|
|
static struct proto tipc_proto_kern = {
|
|
.name = "TIPC",
|
|
.obj_size = sizeof(struct tipc_sock),
|
|
.sysctl_rmem = sysctl_tipc_rmem
|
|
};
|
|
|
|
/**
|
|
* 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) {
|
|
pr_err("Failed to register TIPC protocol type\n");
|
|
goto out;
|
|
}
|
|
|
|
res = sock_register(&tipc_family_ops);
|
|
if (res) {
|
|
pr_err("Failed to register TIPC socket type\n");
|
|
proto_unregister(&tipc_proto);
|
|
goto out;
|
|
}
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tipc_socket_stop - stop TIPC socket interface
|
|
*/
|
|
void tipc_socket_stop(void)
|
|
{
|
|
sock_unregister(tipc_family_ops.family);
|
|
proto_unregister(&tipc_proto);
|
|
}
|