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![Dan Carpenter](/assets/img/avatar_default.png)
This is never called with a NULL "buf" and anyway, we dereference 's' on the lines before so it would Oops before we reach the check. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
384 lines
11 KiB
C
384 lines
11 KiB
C
/*
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* net/tipc/subscr.c: TIPC network topology service
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2005-2007, 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 "name_table.h"
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#include "subscr.h"
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/**
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* struct tipc_subscriber - TIPC network topology subscriber
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* @kref: reference counter to tipc_subscription object
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* @conid: connection identifier to server connecting to subscriber
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* @lock: control access to subscriber
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* @subscrp_list: list of subscription objects for this subscriber
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*/
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struct tipc_subscriber {
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struct kref kref;
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int conid;
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spinlock_t lock;
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struct list_head subscrp_list;
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};
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static void tipc_subscrp_delete(struct tipc_subscription *sub);
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static void tipc_subscrb_put(struct tipc_subscriber *subscriber);
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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 u32 htohl(u32 in, int swap)
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{
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return swap ? swab32(in) : in;
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}
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static void tipc_subscrp_send_event(struct tipc_subscription *sub,
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u32 found_lower, u32 found_upper,
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u32 event, u32 port_ref, u32 node)
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{
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struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
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struct tipc_subscriber *subscriber = sub->subscriber;
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struct kvec 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->swap);
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sub->evt.found_lower = htohl(found_lower, sub->swap);
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sub->evt.found_upper = htohl(found_upper, sub->swap);
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sub->evt.port.ref = htohl(port_ref, sub->swap);
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sub->evt.port.node = htohl(node, sub->swap);
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tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL,
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msg_sect.iov_base, msg_sect.iov_len);
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}
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/**
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* tipc_subscrp_check_overlap - test for subscription overlap with the
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* given values
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*
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* Returns 1 if there is overlap, otherwise 0.
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*/
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int tipc_subscrp_check_overlap(struct tipc_name_seq *seq, u32 found_lower,
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u32 found_upper)
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{
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if (found_lower < seq->lower)
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found_lower = seq->lower;
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if (found_upper > seq->upper)
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found_upper = 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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u32 tipc_subscrp_convert_seq_type(u32 type, int swap)
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{
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return htohl(type, swap);
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}
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void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap,
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struct tipc_name_seq *out)
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{
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out->type = htohl(in->type, swap);
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out->lower = htohl(in->lower, swap);
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out->upper = htohl(in->upper, swap);
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}
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void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper, u32 event, u32 port_ref,
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u32 node, int must)
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{
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struct tipc_name_seq seq;
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tipc_subscrp_convert_seq(&sub->evt.s.seq, sub->swap, &seq);
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if (!tipc_subscrp_check_overlap(&seq, found_lower, found_upper))
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return;
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if (!must &&
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!(htohl(sub->evt.s.filter, sub->swap) & TIPC_SUB_PORTS))
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return;
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tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref,
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node);
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}
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static void tipc_subscrp_timeout(unsigned long data)
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{
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struct tipc_subscription *sub = (struct tipc_subscription *)data;
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struct tipc_subscriber *subscriber = sub->subscriber;
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/* Notify subscriber of timeout */
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tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
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TIPC_SUBSCR_TIMEOUT, 0, 0);
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spin_lock_bh(&subscriber->lock);
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tipc_subscrp_delete(sub);
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spin_unlock_bh(&subscriber->lock);
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tipc_subscrb_put(subscriber);
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}
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static void tipc_subscrb_kref_release(struct kref *kref)
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{
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struct tipc_subscriber *subcriber = container_of(kref,
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struct tipc_subscriber, kref);
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kfree(subcriber);
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}
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static void tipc_subscrb_put(struct tipc_subscriber *subscriber)
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{
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kref_put(&subscriber->kref, tipc_subscrb_kref_release);
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}
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static void tipc_subscrb_get(struct tipc_subscriber *subscriber)
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{
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kref_get(&subscriber->kref);
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}
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static struct tipc_subscriber *tipc_subscrb_create(int conid)
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{
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struct tipc_subscriber *subscriber;
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subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC);
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if (!subscriber) {
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pr_warn("Subscriber rejected, no memory\n");
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return NULL;
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}
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kref_init(&subscriber->kref);
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INIT_LIST_HEAD(&subscriber->subscrp_list);
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subscriber->conid = conid;
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spin_lock_init(&subscriber->lock);
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return subscriber;
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}
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static void tipc_subscrb_delete(struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub, *temp;
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u32 timeout;
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spin_lock_bh(&subscriber->lock);
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/* Destroy any existing subscriptions for subscriber */
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list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
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subscrp_list) {
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timeout = htohl(sub->evt.s.timeout, sub->swap);
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if ((timeout == TIPC_WAIT_FOREVER) || del_timer(&sub->timer)) {
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tipc_subscrp_delete(sub);
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tipc_subscrb_put(subscriber);
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}
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}
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spin_unlock_bh(&subscriber->lock);
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tipc_subscrb_put(subscriber);
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}
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static void tipc_subscrp_delete(struct tipc_subscription *sub)
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{
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struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
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tipc_nametbl_unsubscribe(sub);
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list_del(&sub->subscrp_list);
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kfree(sub);
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atomic_dec(&tn->subscription_count);
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}
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static void tipc_subscrp_cancel(struct tipc_subscr *s,
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struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub, *temp;
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u32 timeout;
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spin_lock_bh(&subscriber->lock);
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/* Find first matching subscription, exit if not found */
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list_for_each_entry_safe(sub, temp, &subscriber->subscrp_list,
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subscrp_list) {
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if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
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timeout = htohl(sub->evt.s.timeout, sub->swap);
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if ((timeout == TIPC_WAIT_FOREVER) ||
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del_timer(&sub->timer)) {
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tipc_subscrp_delete(sub);
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tipc_subscrb_put(subscriber);
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}
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break;
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}
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}
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spin_unlock_bh(&subscriber->lock);
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}
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static struct tipc_subscription *tipc_subscrp_create(struct net *net,
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struct tipc_subscr *s,
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int swap)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_subscription *sub;
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u32 filter = htohl(s->filter, swap);
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/* Refuse subscription if global limit exceeded */
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if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
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pr_warn("Subscription rejected, limit reached (%u)\n",
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TIPC_MAX_SUBSCRIPTIONS);
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return NULL;
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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) {
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pr_warn("Subscription rejected, no memory\n");
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return NULL;
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}
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/* Initialize subscription object */
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sub->net = net;
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if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) ||
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(htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) {
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pr_warn("Subscription rejected, illegal request\n");
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kfree(sub);
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return NULL;
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}
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sub->swap = swap;
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memcpy(&sub->evt.s, s, sizeof(*s));
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atomic_inc(&tn->subscription_count);
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return sub;
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}
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static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s,
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struct tipc_subscriber *subscriber, int swap)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_subscription *sub = NULL;
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u32 timeout;
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sub = tipc_subscrp_create(net, s, swap);
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if (!sub)
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return tipc_conn_terminate(tn->topsrv, subscriber->conid);
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spin_lock_bh(&subscriber->lock);
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list_add(&sub->subscrp_list, &subscriber->subscrp_list);
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tipc_subscrb_get(subscriber);
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sub->subscriber = subscriber;
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tipc_nametbl_subscribe(sub);
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spin_unlock_bh(&subscriber->lock);
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timeout = htohl(sub->evt.s.timeout, swap);
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if (timeout == TIPC_WAIT_FOREVER)
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return;
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setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub);
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mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout));
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}
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/* Handle one termination request for the subscriber */
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static void tipc_subscrb_release_cb(int conid, void *usr_data)
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{
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tipc_subscrb_delete((struct tipc_subscriber *)usr_data);
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}
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/* Handle one request to create a new subscription for the subscriber */
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static void tipc_subscrb_rcv_cb(struct net *net, int conid,
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struct sockaddr_tipc *addr, void *usr_data,
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void *buf, size_t len)
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{
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struct tipc_subscriber *subscriber = usr_data;
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struct tipc_subscr *s = (struct tipc_subscr *)buf;
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int swap;
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/* Determine subscriber's endianness */
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swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE |
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TIPC_SUB_CANCEL));
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/* Detect & process a subscription cancellation request */
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if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
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s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
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return tipc_subscrp_cancel(s, subscriber);
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}
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tipc_subscrp_subscribe(net, s, subscriber, swap);
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}
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/* Handle one request to establish a new subscriber */
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static void *tipc_subscrb_connect_cb(int conid)
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{
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return (void *)tipc_subscrb_create(conid);
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}
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int tipc_topsrv_start(struct net *net)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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const char name[] = "topology_server";
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struct tipc_server *topsrv;
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struct sockaddr_tipc *saddr;
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saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC);
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if (!saddr)
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return -ENOMEM;
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saddr->family = AF_TIPC;
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saddr->addrtype = TIPC_ADDR_NAMESEQ;
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saddr->addr.nameseq.type = TIPC_TOP_SRV;
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saddr->addr.nameseq.lower = TIPC_TOP_SRV;
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saddr->addr.nameseq.upper = TIPC_TOP_SRV;
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saddr->scope = TIPC_NODE_SCOPE;
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topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC);
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if (!topsrv) {
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kfree(saddr);
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return -ENOMEM;
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}
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topsrv->net = net;
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topsrv->saddr = saddr;
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topsrv->imp = TIPC_CRITICAL_IMPORTANCE;
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topsrv->type = SOCK_SEQPACKET;
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topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr);
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topsrv->tipc_conn_recvmsg = tipc_subscrb_rcv_cb;
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topsrv->tipc_conn_new = tipc_subscrb_connect_cb;
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topsrv->tipc_conn_release = tipc_subscrb_release_cb;
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strncpy(topsrv->name, name, strlen(name) + 1);
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tn->topsrv = topsrv;
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atomic_set(&tn->subscription_count, 0);
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return tipc_server_start(topsrv);
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}
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void tipc_topsrv_stop(struct net *net)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_server *topsrv = tn->topsrv;
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tipc_server_stop(topsrv);
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kfree(topsrv->saddr);
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kfree(topsrv);
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}
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