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Diffstat (limited to '')
| -rw-r--r-- | net/tipc/subscr.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c new file mode 100644 index 000000000..f340e53da --- /dev/null +++ b/net/tipc/subscr.c @@ -0,0 +1,174 @@ +/* + * net/tipc/subscr.c: TIPC network topology service + * + * Copyright (c) 2000-2017, Ericsson AB + * Copyright (c) 2005-2007, 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 "name_table.h" +#include "subscr.h" + +static void tipc_sub_send_event(struct tipc_subscription *sub, + u32 found_lower, u32 found_upper, + u32 event, u32 port, u32 node) +{ + struct tipc_event *evt = &sub->evt; + + if (sub->inactive) + return; + tipc_evt_write(evt, event, event); + tipc_evt_write(evt, found_lower, found_lower); + tipc_evt_write(evt, found_upper, found_upper); + tipc_evt_write(evt, port.ref, port); + tipc_evt_write(evt, port.node, node); + tipc_topsrv_queue_evt(sub->net, sub->conid, event, evt); +} + +/** + * tipc_sub_check_overlap - test for subscription overlap with the + * given values + * + * Returns 1 if there is overlap, otherwise 0. + */ +int tipc_sub_check_overlap(struct tipc_name_seq *seq, u32 found_lower, + u32 found_upper) +{ + if (found_lower < seq->lower) + found_lower = seq->lower; + if (found_upper > seq->upper) + found_upper = seq->upper; + if (found_lower > found_upper) + return 0; + return 1; +} + +void tipc_sub_report_overlap(struct tipc_subscription *sub, + u32 found_lower, u32 found_upper, + u32 event, u32 port, u32 node, + u32 scope, int must) +{ + struct tipc_subscr *s = &sub->evt.s; + u32 filter = tipc_sub_read(s, filter); + struct tipc_name_seq seq; + + seq.type = tipc_sub_read(s, seq.type); + seq.lower = tipc_sub_read(s, seq.lower); + seq.upper = tipc_sub_read(s, seq.upper); + + if (!tipc_sub_check_overlap(&seq, found_lower, found_upper)) + return; + + if (!must && !(filter & TIPC_SUB_PORTS)) + return; + if (filter & TIPC_SUB_CLUSTER_SCOPE && scope == TIPC_NODE_SCOPE) + return; + if (filter & TIPC_SUB_NODE_SCOPE && scope != TIPC_NODE_SCOPE) + return; + spin_lock(&sub->lock); + tipc_sub_send_event(sub, found_lower, found_upper, + event, port, node); + spin_unlock(&sub->lock); +} + +static void tipc_sub_timeout(struct timer_list *t) +{ + struct tipc_subscription *sub = from_timer(sub, t, timer); + struct tipc_subscr *s = &sub->evt.s; + + spin_lock(&sub->lock); + tipc_sub_send_event(sub, s->seq.lower, s->seq.upper, + TIPC_SUBSCR_TIMEOUT, 0, 0); + sub->inactive = true; + spin_unlock(&sub->lock); +} + +static void tipc_sub_kref_release(struct kref *kref) +{ + kfree(container_of(kref, struct tipc_subscription, kref)); +} + +void tipc_sub_put(struct tipc_subscription *subscription) +{ + kref_put(&subscription->kref, tipc_sub_kref_release); +} + +void tipc_sub_get(struct tipc_subscription *subscription) +{ + kref_get(&subscription->kref); +} + +struct tipc_subscription *tipc_sub_subscribe(struct net *net, + struct tipc_subscr *s, + int conid) +{ + u32 filter = tipc_sub_read(s, filter); + struct tipc_subscription *sub; + u32 timeout; + + if ((filter & TIPC_SUB_PORTS && filter & TIPC_SUB_SERVICE) || + (tipc_sub_read(s, seq.lower) > tipc_sub_read(s, seq.upper))) { + pr_warn("Subscription rejected, illegal request\n"); + return NULL; + } + sub = kmalloc(sizeof(*sub), GFP_ATOMIC); + if (!sub) { + pr_warn("Subscription rejected, no memory\n"); + return NULL; + } + INIT_LIST_HEAD(&sub->service_list); + INIT_LIST_HEAD(&sub->sub_list); + sub->net = net; + sub->conid = conid; + sub->inactive = false; + memcpy(&sub->evt.s, s, sizeof(*s)); + spin_lock_init(&sub->lock); + kref_init(&sub->kref); + if (!tipc_nametbl_subscribe(sub)) { + kfree(sub); + return NULL; + } + timer_setup(&sub->timer, tipc_sub_timeout, 0); + timeout = tipc_sub_read(&sub->evt.s, timeout); + if (timeout != TIPC_WAIT_FOREVER) + mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout)); + return sub; +} + +void tipc_sub_unsubscribe(struct tipc_subscription *sub) +{ + tipc_nametbl_unsubscribe(sub); + if (sub->evt.s.timeout != TIPC_WAIT_FOREVER) + del_timer_sync(&sub->timer); + list_del(&sub->sub_list); + tipc_sub_put(sub); +} |