2006-01-02 18:04:38 +00:00
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/*
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* net/tipc/subscr.c: TIPC subscription service
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*
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2006-01-11 18:14:19 +00:00
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* Copyright (c) 2000-2006, Ericsson AB
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2006-01-02 18:04:38 +00:00
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* Copyright (c) 2005, Wind River Systems
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* All rights reserved.
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*
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2006-01-11 12:30:43 +00:00
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* Redistribution and use in source and binary forms, with or without
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2006-01-02 18:04:38 +00:00
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* modification, are permitted provided that the following conditions are met:
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*
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2006-01-11 12:30:43 +00:00
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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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2006-01-02 18:04:38 +00:00
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*
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2006-01-11 12:30:43 +00:00
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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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2006-01-02 18:04:38 +00:00
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "dbg.h"
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#include "subscr.h"
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#include "name_table.h"
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#include "ref.h"
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/**
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* struct subscriber - TIPC network topology subscriber
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* @ref: object reference to subscriber object itself
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* @lock: pointer to spinlock controlling access to subscriber object
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* @subscriber_list: adjacent subscribers in top. server's list of subscribers
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* @subscription_list: list of subscription objects for this subscriber
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* @port_ref: object reference to port used to communicate with subscriber
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* @swap: indicates if subscriber uses opposite endianness in its messages
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*/
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struct subscriber {
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u32 ref;
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spinlock_t *lock;
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struct list_head subscriber_list;
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struct list_head subscription_list;
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u32 port_ref;
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int swap;
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};
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/**
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* struct top_srv - TIPC network topology subscription service
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* @user_ref: TIPC userid of subscription service
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* @setup_port: reference to TIPC port that handles subscription requests
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* @subscription_count: number of active subscriptions (not subscribers!)
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* @subscriber_list: list of ports subscribing to service
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* @lock: spinlock govering access to subscriber list
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*/
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struct top_srv {
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u32 user_ref;
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u32 setup_port;
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atomic_t subscription_count;
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struct list_head subscriber_list;
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spinlock_t lock;
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};
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static struct top_srv topsrv = { 0 };
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/**
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* htohl - convert value to endianness used by destination
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* @in: value to convert
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* @swap: non-zero if endianness must be reversed
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*
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* Returns converted value
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*/
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static inline u32 htohl(u32 in, int swap)
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{
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char *c = (char *)∈
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return swap ? ((c[3] << 3) + (c[2] << 2) + (c[1] << 1) + c[0]) : in;
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}
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/**
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* subscr_send_event - send a message containing a tipc_event to the subscriber
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*/
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static void subscr_send_event(struct subscription *sub,
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u32 found_lower,
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u32 found_upper,
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u32 event,
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u32 port_ref,
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u32 node)
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{
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struct iovec msg_sect;
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msg_sect.iov_base = (void *)&sub->evt;
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msg_sect.iov_len = sizeof(struct tipc_event);
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sub->evt.event = htohl(event, sub->owner->swap);
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sub->evt.found_lower = htohl(found_lower, sub->owner->swap);
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sub->evt.found_upper = htohl(found_upper, sub->owner->swap);
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sub->evt.port.ref = htohl(port_ref, sub->owner->swap);
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sub->evt.port.node = htohl(node, sub->owner->swap);
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tipc_send(sub->owner->port_ref, 1, &msg_sect);
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}
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/**
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2006-01-17 23:38:21 +00:00
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* tipc_subscr_overlap - test for subscription overlap with the given values
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2006-01-02 18:04:38 +00:00
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*
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* Returns 1 if there is overlap, otherwise 0.
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*/
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2006-01-17 23:38:21 +00:00
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int tipc_subscr_overlap(struct subscription *sub,
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u32 found_lower,
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u32 found_upper)
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2006-01-02 18:04:38 +00:00
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{
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if (found_lower < sub->seq.lower)
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found_lower = sub->seq.lower;
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if (found_upper > sub->seq.upper)
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found_upper = sub->seq.upper;
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if (found_lower > found_upper)
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return 0;
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return 1;
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}
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/**
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2006-01-17 23:38:21 +00:00
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* tipc_subscr_report_overlap - issue event if there is subscription overlap
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2006-01-02 18:04:38 +00:00
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*
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* Protected by nameseq.lock in name_table.c
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*/
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2006-01-17 23:38:21 +00:00
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void tipc_subscr_report_overlap(struct subscription *sub,
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u32 found_lower,
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u32 found_upper,
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u32 event,
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u32 port_ref,
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u32 node,
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int must)
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2006-01-02 18:04:38 +00:00
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{
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dbg("Rep overlap %u:%u,%u<->%u,%u\n", sub->seq.type, sub->seq.lower,
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sub->seq.upper, found_lower, found_upper);
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2006-01-17 23:38:21 +00:00
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if (!tipc_subscr_overlap(sub, found_lower, found_upper))
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2006-01-02 18:04:38 +00:00
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return;
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if (!must && (sub->filter != TIPC_SUB_PORTS))
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return;
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subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
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}
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/**
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* subscr_timeout - subscription timeout has occurred
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*/
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static void subscr_timeout(struct subscription *sub)
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{
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struct subscriber *subscriber;
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u32 subscriber_ref;
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/* Validate subscriber reference (in case subscriber is terminating) */
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subscriber_ref = sub->owner->ref;
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2006-01-17 23:38:21 +00:00
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subscriber = (struct subscriber *)tipc_ref_lock(subscriber_ref);
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2006-01-02 18:04:38 +00:00
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if (subscriber == NULL)
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return;
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/* Unlink subscription from name table */
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2006-01-17 23:38:21 +00:00
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tipc_nametbl_unsubscribe(sub);
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2006-01-02 18:04:38 +00:00
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/* Notify subscriber of timeout, then unlink subscription */
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subscr_send_event(sub,
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sub->evt.s.seq.lower,
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sub->evt.s.seq.upper,
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TIPC_SUBSCR_TIMEOUT,
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0,
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0);
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list_del(&sub->subscription_list);
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/* Now destroy subscription */
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2006-01-17 23:38:21 +00:00
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tipc_ref_unlock(subscriber_ref);
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2006-01-02 18:04:38 +00:00
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k_term_timer(&sub->timer);
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kfree(sub);
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atomic_dec(&topsrv.subscription_count);
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}
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/**
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* subscr_terminate - terminate communication with a subscriber
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*
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* Called with subscriber locked. Routine must temporarily release this lock
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* to enable subscription timeout routine(s) to finish without deadlocking;
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* the lock is then reclaimed to allow caller to release it upon return.
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* (This should work even in the unlikely event some other thread creates
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* a new object reference in the interim that uses this lock; this routine will
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* simply wait for it to be released, then claim it.)
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*/
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static void subscr_terminate(struct subscriber *subscriber)
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{
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struct subscription *sub;
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struct subscription *sub_temp;
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/* Invalidate subscriber reference */
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2006-01-17 23:38:21 +00:00
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tipc_ref_discard(subscriber->ref);
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2006-01-02 18:04:38 +00:00
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spin_unlock_bh(subscriber->lock);
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/* Destroy any existing subscriptions for subscriber */
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list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
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subscription_list) {
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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k_cancel_timer(&sub->timer);
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k_term_timer(&sub->timer);
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}
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2006-01-17 23:38:21 +00:00
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tipc_nametbl_unsubscribe(sub);
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2006-01-02 18:04:38 +00:00
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list_del(&sub->subscription_list);
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dbg("Term: Removed sub %u,%u,%u from subscriber %x list\n",
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sub->seq.type, sub->seq.lower, sub->seq.upper, subscriber);
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kfree(sub);
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atomic_dec(&topsrv.subscription_count);
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}
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/* Sever connection to subscriber */
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tipc_shutdown(subscriber->port_ref);
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tipc_deleteport(subscriber->port_ref);
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/* Remove subscriber from topology server's subscriber list */
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spin_lock_bh(&topsrv.lock);
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list_del(&subscriber->subscriber_list);
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spin_unlock_bh(&topsrv.lock);
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/* Now destroy subscriber */
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spin_lock_bh(subscriber->lock);
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kfree(subscriber);
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}
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/**
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* subscr_subscribe - create subscription for subscriber
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*
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* Called with subscriber locked
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*/
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static void subscr_subscribe(struct tipc_subscr *s,
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struct subscriber *subscriber)
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{
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struct subscription *sub;
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/* Refuse subscription if global limit exceeded */
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if (atomic_read(&topsrv.subscription_count) >= tipc_max_subscriptions) {
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warn("Failed: max %u subscriptions\n", tipc_max_subscriptions);
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subscr_terminate(subscriber);
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return;
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}
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/* Allocate subscription object */
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sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
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if (sub == NULL) {
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warn("Memory squeeze; ignoring subscription\n");
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subscr_terminate(subscriber);
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return;
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}
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/* Determine/update subscriber's endianness */
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if ((s->filter == TIPC_SUB_PORTS) || (s->filter == TIPC_SUB_SERVICE))
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subscriber->swap = 0;
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else
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subscriber->swap = 1;
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/* Initialize subscription object */
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memset(sub, 0, sizeof(*sub));
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sub->seq.type = htohl(s->seq.type, subscriber->swap);
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sub->seq.lower = htohl(s->seq.lower, subscriber->swap);
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sub->seq.upper = htohl(s->seq.upper, subscriber->swap);
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sub->timeout = htohl(s->timeout, subscriber->swap);
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sub->filter = htohl(s->filter, subscriber->swap);
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if ((((sub->filter != TIPC_SUB_PORTS)
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&& (sub->filter != TIPC_SUB_SERVICE)))
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|| (sub->seq.lower > sub->seq.upper)) {
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warn("Rejecting illegal subscription %u,%u,%u\n",
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sub->seq.type, sub->seq.lower, sub->seq.upper);
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kfree(sub);
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subscr_terminate(subscriber);
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return;
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}
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memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
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INIT_LIST_HEAD(&sub->subscription_list);
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INIT_LIST_HEAD(&sub->nameseq_list);
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list_add(&sub->subscription_list, &subscriber->subscription_list);
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atomic_inc(&topsrv.subscription_count);
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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k_init_timer(&sub->timer,
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(Handler)subscr_timeout, (unsigned long)sub);
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k_start_timer(&sub->timer, sub->timeout);
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}
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sub->owner = subscriber;
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2006-01-17 23:38:21 +00:00
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tipc_nametbl_subscribe(sub);
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2006-01-02 18:04:38 +00:00
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}
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/**
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* subscr_conn_shutdown_event - handle termination request from subscriber
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*/
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static void subscr_conn_shutdown_event(void *usr_handle,
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u32 portref,
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struct sk_buff **buf,
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unsigned char const *data,
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unsigned int size,
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int reason)
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{
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2006-01-12 21:22:32 +00:00
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struct subscriber *subscriber;
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2006-01-02 18:04:38 +00:00
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spinlock_t *subscriber_lock;
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2006-01-17 23:38:21 +00:00
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subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle);
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2006-01-02 18:04:38 +00:00
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if (subscriber == NULL)
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return;
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subscriber_lock = subscriber->lock;
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subscr_terminate(subscriber);
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spin_unlock_bh(subscriber_lock);
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}
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/**
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* subscr_conn_msg_event - handle new subscription request from subscriber
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*/
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static void subscr_conn_msg_event(void *usr_handle,
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u32 port_ref,
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struct sk_buff **buf,
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const unchar *data,
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u32 size)
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{
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2006-01-12 21:22:32 +00:00
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struct subscriber *subscriber;
|
2006-01-02 18:04:38 +00:00
|
|
|
spinlock_t *subscriber_lock;
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
subscriber = tipc_ref_lock((u32)(unsigned long)usr_handle);
|
2006-01-02 18:04:38 +00:00
|
|
|
if (subscriber == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
subscriber_lock = subscriber->lock;
|
|
|
|
if (size != sizeof(struct tipc_subscr))
|
|
|
|
subscr_terminate(subscriber);
|
|
|
|
else
|
|
|
|
subscr_subscribe((struct tipc_subscr *)data, subscriber);
|
|
|
|
|
|
|
|
spin_unlock_bh(subscriber_lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* subscr_named_msg_event - handle request to establish a new subscriber
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void subscr_named_msg_event(void *usr_handle,
|
|
|
|
u32 port_ref,
|
|
|
|
struct sk_buff **buf,
|
|
|
|
const unchar *data,
|
|
|
|
u32 size,
|
|
|
|
u32 importance,
|
|
|
|
struct tipc_portid const *orig,
|
|
|
|
struct tipc_name_seq const *dest)
|
|
|
|
{
|
|
|
|
struct subscriber *subscriber;
|
|
|
|
struct iovec msg_sect = {0, 0};
|
|
|
|
spinlock_t *subscriber_lock;
|
|
|
|
|
|
|
|
dbg("subscr_named_msg_event: orig = %x own = %x,\n",
|
|
|
|
orig->node, tipc_own_addr);
|
|
|
|
if (size && (size != sizeof(struct tipc_subscr))) {
|
|
|
|
warn("Received tipc_subscr of invalid size\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Create subscriber object */
|
|
|
|
|
|
|
|
subscriber = kmalloc(sizeof(struct subscriber), GFP_ATOMIC);
|
|
|
|
if (subscriber == NULL) {
|
|
|
|
warn("Memory squeeze; ignoring subscriber setup\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
memset(subscriber, 0, sizeof(struct subscriber));
|
|
|
|
INIT_LIST_HEAD(&subscriber->subscription_list);
|
|
|
|
INIT_LIST_HEAD(&subscriber->subscriber_list);
|
2006-01-17 23:38:21 +00:00
|
|
|
subscriber->ref = tipc_ref_acquire(subscriber, &subscriber->lock);
|
2006-01-02 18:04:38 +00:00
|
|
|
if (subscriber->ref == 0) {
|
|
|
|
warn("Failed to acquire subscriber reference\n");
|
|
|
|
kfree(subscriber);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Establish a connection to subscriber */
|
|
|
|
|
|
|
|
tipc_createport(topsrv.user_ref,
|
2006-01-12 21:22:32 +00:00
|
|
|
(void *)(unsigned long)subscriber->ref,
|
2006-01-02 18:04:38 +00:00
|
|
|
importance,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
subscr_conn_shutdown_event,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
subscr_conn_msg_event,
|
|
|
|
0,
|
|
|
|
&subscriber->port_ref);
|
|
|
|
if (subscriber->port_ref == 0) {
|
|
|
|
warn("Memory squeeze; failed to create subscription port\n");
|
2006-01-17 23:38:21 +00:00
|
|
|
tipc_ref_discard(subscriber->ref);
|
2006-01-02 18:04:38 +00:00
|
|
|
kfree(subscriber);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
tipc_connect2port(subscriber->port_ref, orig);
|
|
|
|
|
|
|
|
|
|
|
|
/* Add subscriber to topology server's subscriber list */
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
tipc_ref_lock(subscriber->ref);
|
2006-01-02 18:04:38 +00:00
|
|
|
spin_lock_bh(&topsrv.lock);
|
|
|
|
list_add(&subscriber->subscriber_list, &topsrv.subscriber_list);
|
|
|
|
spin_unlock_bh(&topsrv.lock);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Subscribe now if message contains a subscription,
|
|
|
|
* otherwise send an empty response to complete connection handshaking
|
|
|
|
*/
|
|
|
|
|
|
|
|
subscriber_lock = subscriber->lock;
|
|
|
|
if (size)
|
|
|
|
subscr_subscribe((struct tipc_subscr *)data, subscriber);
|
|
|
|
else
|
|
|
|
tipc_send(subscriber->port_ref, 1, &msg_sect);
|
|
|
|
|
|
|
|
spin_unlock_bh(subscriber_lock);
|
|
|
|
}
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
int tipc_subscr_start(void)
|
2006-01-02 18:04:38 +00:00
|
|
|
{
|
|
|
|
struct tipc_name_seq seq = {TIPC_TOP_SRV, TIPC_TOP_SRV, TIPC_TOP_SRV};
|
|
|
|
int res = -1;
|
|
|
|
|
|
|
|
memset(&topsrv, 0, sizeof (topsrv));
|
|
|
|
topsrv.lock = SPIN_LOCK_UNLOCKED;
|
|
|
|
INIT_LIST_HEAD(&topsrv.subscriber_list);
|
|
|
|
|
|
|
|
spin_lock_bh(&topsrv.lock);
|
|
|
|
res = tipc_attach(&topsrv.user_ref, 0, 0);
|
|
|
|
if (res) {
|
|
|
|
spin_unlock_bh(&topsrv.lock);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
res = tipc_createport(topsrv.user_ref,
|
|
|
|
0,
|
|
|
|
TIPC_CRITICAL_IMPORTANCE,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
subscr_named_msg_event,
|
|
|
|
0,
|
|
|
|
0,
|
|
|
|
&topsrv.setup_port);
|
|
|
|
if (res)
|
|
|
|
goto failed;
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
res = tipc_nametbl_publish_rsv(topsrv.setup_port, TIPC_NODE_SCOPE, &seq);
|
2006-01-02 18:04:38 +00:00
|
|
|
if (res)
|
|
|
|
goto failed;
|
|
|
|
|
|
|
|
spin_unlock_bh(&topsrv.lock);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
failed:
|
2006-01-11 12:52:51 +00:00
|
|
|
err("Failed to create subscription service\n");
|
2006-01-02 18:04:38 +00:00
|
|
|
tipc_detach(topsrv.user_ref);
|
|
|
|
topsrv.user_ref = 0;
|
|
|
|
spin_unlock_bh(&topsrv.lock);
|
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
void tipc_subscr_stop(void)
|
2006-01-02 18:04:38 +00:00
|
|
|
{
|
|
|
|
struct subscriber *subscriber;
|
|
|
|
struct subscriber *subscriber_temp;
|
|
|
|
spinlock_t *subscriber_lock;
|
|
|
|
|
|
|
|
if (topsrv.user_ref) {
|
|
|
|
tipc_deleteport(topsrv.setup_port);
|
|
|
|
list_for_each_entry_safe(subscriber, subscriber_temp,
|
|
|
|
&topsrv.subscriber_list,
|
|
|
|
subscriber_list) {
|
2006-01-17 23:38:21 +00:00
|
|
|
tipc_ref_lock(subscriber->ref);
|
2006-01-02 18:04:38 +00:00
|
|
|
subscriber_lock = subscriber->lock;
|
|
|
|
subscr_terminate(subscriber);
|
|
|
|
spin_unlock_bh(subscriber_lock);
|
|
|
|
}
|
|
|
|
tipc_detach(topsrv.user_ref);
|
|
|
|
topsrv.user_ref = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int tipc_ispublished(struct tipc_name const *name)
|
|
|
|
{
|
|
|
|
u32 domain = 0;
|
|
|
|
|
2006-01-17 23:38:21 +00:00
|
|
|
return(tipc_nametbl_translate(name->type, name->instance,&domain) != 0);
|
2006-01-02 18:04:38 +00:00
|
|
|
}
|
|
|
|
|