linux/net/tipc/port.c
Jon Paul Maloy 5728901581 tipc: clean up socket timer function
The last remaining BH upcall to the socket, apart for the message
reception function tipc_sk_rcv(), is the timer function.

We prefer to let this function continue executing in BH, since it only
does read-acces to semi-permanent data, but we make three changes to it:

1) We introduce a bh_lock_sock()/bh_unlock_sock() inside the scope
   of port_lock.  This is a preparation for replacing port_lock with
   bh_lock_sock() at the locations where it is still used.

2) We move the function from port.c to socket.c, as a further step
   of eliminating the port code level altogether.

3) We let it make use of the newly introduced tipc_msg_create()
   function. This enables us to get rid of three context specific
   functions (port_create_self_abort_msg() etc.) in port.c

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-08-23 11:18:33 -07:00

412 lines
11 KiB
C

/*
* net/tipc/port.c: TIPC port code
*
* Copyright (c) 1992-2007, 2014, Ericsson AB
* Copyright (c) 2004-2008, 2010-2013, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "core.h"
#include "config.h"
#include "port.h"
#include "name_table.h"
#include "socket.h"
/* Connection management: */
#define PROBING_INTERVAL 3600000 /* [ms] => 1 h */
#define MAX_REJECT_SIZE 1024
DEFINE_SPINLOCK(tipc_port_list_lock);
static LIST_HEAD(ports);
/**
* tipc_port_peer_msg - verify message was sent by connected port's peer
*
* Handles cases where the node's network address has changed from
* the default of <0.0.0> to its configured setting.
*/
int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg)
{
u32 peernode;
u32 orignode;
if (msg_origport(msg) != tipc_port_peerport(p_ptr))
return 0;
orignode = msg_orignode(msg);
peernode = tipc_port_peernode(p_ptr);
return (orignode == peernode) ||
(!orignode && (peernode == tipc_own_addr)) ||
(!peernode && (orignode == tipc_own_addr));
}
/* tipc_port_init - intiate TIPC port and lock it
*
* Returns obtained reference if initialization is successful, zero otherwise
*/
u32 tipc_port_init(struct tipc_port *p_ptr,
const unsigned int importance)
{
struct tipc_msg *msg;
u32 ref;
ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
if (!ref) {
pr_warn("Port registration failed, ref. table exhausted\n");
return 0;
}
p_ptr->max_pkt = MAX_PKT_DEFAULT;
p_ptr->ref = ref;
INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
INIT_LIST_HEAD(&p_ptr->publications);
INIT_LIST_HEAD(&p_ptr->port_list);
/*
* Must hold port list lock while initializing message header template
* to ensure a change to node's own network address doesn't result
* in template containing out-dated network address information
*/
spin_lock_bh(&tipc_port_list_lock);
msg = &p_ptr->phdr;
tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
msg_set_origport(msg, ref);
list_add_tail(&p_ptr->port_list, &ports);
spin_unlock_bh(&tipc_port_list_lock);
return ref;
}
void tipc_port_destroy(struct tipc_port *p_ptr)
{
struct sk_buff *buf = NULL;
struct tipc_msg *msg = NULL;
u32 peer_node;
tipc_withdraw(p_ptr, 0, NULL);
spin_lock_bh(p_ptr->lock);
tipc_ref_discard(p_ptr->ref);
spin_unlock_bh(p_ptr->lock);
k_cancel_timer(&p_ptr->timer);
if (p_ptr->connected) {
peer_node = tipc_port_peernode(p_ptr);
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
SHORT_H_SIZE, 0, peer_node,
tipc_own_addr, tipc_port_peerport(p_ptr),
p_ptr->ref, TIPC_ERR_NO_PORT);
if (buf) {
msg = buf_msg(buf);
tipc_link_xmit(buf, peer_node, msg_link_selector(msg));
}
tipc_node_remove_conn(peer_node, p_ptr->ref);
}
spin_lock_bh(&tipc_port_list_lock);
list_del(&p_ptr->port_list);
spin_unlock_bh(&tipc_port_list_lock);
k_term_timer(&p_ptr->timer);
}
static int port_print(struct tipc_port *p_ptr, char *buf, int len, int full_id)
{
struct publication *publ;
int ret;
if (full_id)
ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
tipc_zone(tipc_own_addr),
tipc_cluster(tipc_own_addr),
tipc_node(tipc_own_addr), p_ptr->ref);
else
ret = tipc_snprintf(buf, len, "%-10u:", p_ptr->ref);
if (p_ptr->connected) {
u32 dport = tipc_port_peerport(p_ptr);
u32 destnode = tipc_port_peernode(p_ptr);
ret += tipc_snprintf(buf + ret, len - ret,
" connected to <%u.%u.%u:%u>",
tipc_zone(destnode),
tipc_cluster(destnode),
tipc_node(destnode), dport);
if (p_ptr->conn_type != 0)
ret += tipc_snprintf(buf + ret, len - ret,
" via {%u,%u}", p_ptr->conn_type,
p_ptr->conn_instance);
} else if (p_ptr->published) {
ret += tipc_snprintf(buf + ret, len - ret, " bound to");
list_for_each_entry(publ, &p_ptr->publications, pport_list) {
if (publ->lower == publ->upper)
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u}", publ->type,
publ->lower);
else
ret += tipc_snprintf(buf + ret, len - ret,
" {%u,%u,%u}", publ->type,
publ->lower, publ->upper);
}
}
ret += tipc_snprintf(buf + ret, len - ret, "\n");
return ret;
}
struct sk_buff *tipc_port_get_ports(void)
{
struct sk_buff *buf;
struct tlv_desc *rep_tlv;
char *pb;
int pb_len;
struct tipc_port *p_ptr;
int str_len = 0;
buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
if (!buf)
return NULL;
rep_tlv = (struct tlv_desc *)buf->data;
pb = TLV_DATA(rep_tlv);
pb_len = ULTRA_STRING_MAX_LEN;
spin_lock_bh(&tipc_port_list_lock);
list_for_each_entry(p_ptr, &ports, port_list) {
spin_lock_bh(p_ptr->lock);
str_len += port_print(p_ptr, pb, pb_len, 0);
spin_unlock_bh(p_ptr->lock);
}
spin_unlock_bh(&tipc_port_list_lock);
str_len += 1; /* for "\0" */
skb_put(buf, TLV_SPACE(str_len));
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
return buf;
}
void tipc_port_reinit(void)
{
struct tipc_port *p_ptr;
struct tipc_msg *msg;
spin_lock_bh(&tipc_port_list_lock);
list_for_each_entry(p_ptr, &ports, port_list) {
msg = &p_ptr->phdr;
msg_set_prevnode(msg, tipc_own_addr);
msg_set_orignode(msg, tipc_own_addr);
}
spin_unlock_bh(&tipc_port_list_lock);
}
void tipc_acknowledge(u32 ref, u32 ack)
{
struct tipc_port *p_ptr;
struct sk_buff *buf = NULL;
struct tipc_msg *msg;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return;
if (p_ptr->connected)
buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE,
0, tipc_port_peernode(p_ptr),
tipc_own_addr, tipc_port_peerport(p_ptr),
p_ptr->ref, TIPC_OK);
tipc_port_unlock(p_ptr);
if (!buf)
return;
msg = buf_msg(buf);
msg_set_msgcnt(msg, ack);
tipc_link_xmit(buf, msg_destnode(msg), msg_link_selector(msg));
}
int tipc_publish(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
u32 key;
if (p_ptr->connected)
return -EINVAL;
key = p_ptr->ref + p_ptr->pub_count + 1;
if (key == p_ptr->ref)
return -EADDRINUSE;
publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
scope, p_ptr->ref, key);
if (publ) {
list_add(&publ->pport_list, &p_ptr->publications);
p_ptr->pub_count++;
p_ptr->published = 1;
return 0;
}
return -EINVAL;
}
int tipc_withdraw(struct tipc_port *p_ptr, unsigned int scope,
struct tipc_name_seq const *seq)
{
struct publication *publ;
struct publication *tpubl;
int res = -EINVAL;
if (!seq) {
list_for_each_entry_safe(publ, tpubl,
&p_ptr->publications, pport_list) {
tipc_nametbl_withdraw(publ->type, publ->lower,
publ->ref, publ->key);
}
res = 0;
} else {
list_for_each_entry_safe(publ, tpubl,
&p_ptr->publications, pport_list) {
if (publ->scope != scope)
continue;
if (publ->type != seq->type)
continue;
if (publ->lower != seq->lower)
continue;
if (publ->upper != seq->upper)
break;
tipc_nametbl_withdraw(publ->type, publ->lower,
publ->ref, publ->key);
res = 0;
break;
}
}
if (list_empty(&p_ptr->publications))
p_ptr->published = 0;
return res;
}
int tipc_port_connect(u32 ref, struct tipc_portid const *peer)
{
struct tipc_port *p_ptr;
int res;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
res = __tipc_port_connect(ref, p_ptr, peer);
tipc_port_unlock(p_ptr);
return res;
}
/*
* __tipc_port_connect - connect to a remote peer
*
* Port must be locked.
*/
int __tipc_port_connect(u32 ref, struct tipc_port *p_ptr,
struct tipc_portid const *peer)
{
struct tipc_msg *msg;
int res = -EINVAL;
if (p_ptr->published || p_ptr->connected)
goto exit;
if (!peer->ref)
goto exit;
msg = &p_ptr->phdr;
msg_set_destnode(msg, peer->node);
msg_set_destport(msg, peer->ref);
msg_set_type(msg, TIPC_CONN_MSG);
msg_set_lookup_scope(msg, 0);
msg_set_hdr_sz(msg, SHORT_H_SIZE);
p_ptr->probing_interval = PROBING_INTERVAL;
p_ptr->probing_state = TIPC_CONN_OK;
p_ptr->connected = 1;
k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
res = tipc_node_add_conn(tipc_port_peernode(p_ptr), p_ptr->ref,
tipc_port_peerport(p_ptr));
exit:
p_ptr->max_pkt = tipc_node_get_mtu(peer->node, ref);
return res;
}
/*
* __tipc_disconnect - disconnect port from peer
*
* Port must be locked.
*/
int __tipc_port_disconnect(struct tipc_port *tp_ptr)
{
if (tp_ptr->connected) {
tp_ptr->connected = 0;
/* let timer expire on it's own to avoid deadlock! */
tipc_node_remove_conn(tipc_port_peernode(tp_ptr), tp_ptr->ref);
return 0;
}
return -ENOTCONN;
}
/*
* tipc_port_disconnect(): Disconnect port form peer.
* This is a node local operation.
*/
int tipc_port_disconnect(u32 ref)
{
struct tipc_port *p_ptr;
int res;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
res = __tipc_port_disconnect(p_ptr);
tipc_port_unlock(p_ptr);
return res;
}
/*
* tipc_port_shutdown(): Send a SHUTDOWN msg to peer and disconnect
*/
int tipc_port_shutdown(u32 ref)
{
struct tipc_msg *msg;
struct tipc_port *p_ptr;
struct sk_buff *buf = NULL;
u32 peer_node;
p_ptr = tipc_port_lock(ref);
if (!p_ptr)
return -EINVAL;
peer_node = tipc_port_peernode(p_ptr);
buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
SHORT_H_SIZE, 0, peer_node,
tipc_own_addr, tipc_port_peerport(p_ptr),
p_ptr->ref, TIPC_CONN_SHUTDOWN);
tipc_port_unlock(p_ptr);
msg = buf_msg(buf);
tipc_link_xmit(buf, peer_node, msg_link_selector(msg));
return tipc_port_disconnect(ref);
}