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subscr.c
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/* * net/tipc/subscr.c: TIPC network topology service * * Copyright (c) 2000-2006, 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" /** * struct tipc_subscriber - TIPC network topology subscriber * @kref: reference counter to tipc_subscription object * @conid: connection identifier to server connecting to subscriber * @lock: control access to subscriber * @subscrp_list: list of subscription objects for this subscriber */ struct tipc_subscriber { struct kref kref; int conid; spinlock_t lock; struct list_head subscrp_list; }; static void tipc_subscrb_put(struct tipc_subscriber *subscriber); /** * htohl - convert value to endianness used by destination * @in: value to convert * @swap: non-zero if endianness must be reversed * * Returns converted value */ static u32 htohl(u32 in, int swap) { return swap ? swab32(in) : in; } static void tipc_subscrp_send_event(struct tipc_subscription *sub, u32 found_lower, u32 found_upper, u32 event, u32 port_ref, u32 node) { struct tipc_net *tn = net_generic(sub->net, tipc_net_id); struct tipc_subscriber *subscriber = sub->subscriber; struct kvec msg_sect; msg_sect.iov_base = (void *)&sub->evt; msg_sect.iov_len = sizeof(struct tipc_event); sub->evt.event = htohl(event, sub->swap); sub->evt.found_lower = htohl(found_lower, sub->swap); sub->evt.found_upper = htohl(found_upper, sub->swap); sub->evt.port.ref = htohl(port_ref, sub->swap); sub->evt.port.node = htohl(node, sub->swap); tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL, msg_sect.iov_base, msg_sect.iov_len); } /** * tipc_subscrp_check_overlap - test for subscription overlap with the * given values * * Returns 1 if there is overlap, otherwise 0. */ int tipc_subscrp_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; } u32 tipc_subscrp_convert_seq_type(u32 type, int swap) { return htohl(type, swap); } void tipc_subscrp_convert_seq(struct tipc_name_seq *in, int swap, struct tipc_name_seq *out) { out->type = htohl(in->type, swap); out->lower = htohl(in->lower, swap); out->upper = htohl(in->upper, swap); } void tipc_subscrp_report_overlap(struct tipc_subscription *sub, u32 found_lower, u32 found_upper, u32 event, u32 port_ref, u32 node, int must) { struct tipc_name_seq seq; tipc_subscrp_convert_seq(&sub->evt.s.seq, sub->swap, &seq); if (!tipc_subscrp_check_overlap(&seq, found_lower, found_upper)) return; if (!must && !(htohl(sub->evt.s.filter, sub->swap) & TIPC_SUB_PORTS)) return; tipc_subscrp_send_event(sub, found_lower, found_upper, event, port_ref, node); } static void tipc_subscrp_timeout(unsigned long data) { struct tipc_subscription *sub = (struct tipc_subscription *)data; struct tipc_subscriber *subscriber = sub->subscriber; spin_lock_bh(&subscriber->lock); tipc_nametbl_unsubscribe(sub); list_del(&sub->subscrp_list); spin_unlock_bh(&subscriber->lock); /* Notify subscriber of timeout */ tipc_subscrp_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper, TIPC_SUBSCR_TIMEOUT, 0, 0); tipc_subscrp_put(sub); } static void tipc_subscrb_kref_release(struct kref *kref) { kfree(container_of(kref,struct tipc_subscriber, kref)); } static void tipc_subscrb_put(struct tipc_subscriber *subscriber) { kref_put(&subscriber->kref, tipc_subscrb_kref_release); } static void tipc_subscrb_get(struct tipc_subscriber *subscriber) { kref_get(&subscriber->kref); } static void tipc_subscrp_kref_release(struct kref *kref) { struct tipc_subscription *sub = container_of(kref, struct tipc_subscription, kref); struct tipc_net *tn = net_generic(sub->net, tipc_net_id); struct tipc_subscriber *subscriber = sub->subscriber; atomic_dec(&tn->subscription_count); kfree(sub); tipc_subscrb_put(subscriber); } void tipc_subscrp_put(struct tipc_subscription *subscription) { kref_put(&subscription->kref, tipc_subscrp_kref_release); } void tipc_subscrp_get(struct tipc_subscription *subscription) { kref_get(&subscription->kref); } /* tipc_subscrb_subscrp_delete - delete a specific subscription or all * subscriptions for a given subscriber. */ static void tipc_subscrb_subscrp_delete(struct tipc_subscriber *subscriber, struct tipc_subscr *s) { struct list_head *subscription_list = &subscriber->subscrp_list; struct tipc_subscription *sub, *temp; u32 timeout; spin_lock_bh(&subscriber->lock); list_for_each_entry_safe(sub, temp, subscription_list, subscrp_list) { if (s && memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) continue; timeout = htohl(sub->evt.s.timeout, sub->swap); if (timeout == TIPC_WAIT_FOREVER || del_timer(&sub->timer)) { tipc_nametbl_unsubscribe(sub); list_del(&sub->subscrp_list); tipc_subscrp_put(sub); } if (s) break; } spin_unlock_bh(&subscriber->lock); } static struct tipc_subscriber *tipc_subscrb_create(int conid) { struct tipc_subscriber *subscriber; subscriber = kzalloc(sizeof(*subscriber), GFP_ATOMIC); if (!subscriber) { pr_warn("Subscriber rejected, no memory\n"); return NULL; } INIT_LIST_HEAD(&subscriber->subscrp_list); kref_init(&subscriber->kref); subscriber->conid = conid; spin_lock_init(&subscriber->lock); return subscriber; } static void tipc_subscrb_delete(struct tipc_subscriber *subscriber) { tipc_subscrb_subscrp_delete(subscriber, NULL); tipc_subscrb_put(subscriber); } static void tipc_subscrp_cancel(struct tipc_subscr *s, struct tipc_subscriber *subscriber) { tipc_subscrb_get(subscriber); tipc_subscrb_subscrp_delete(subscriber, s); tipc_subscrb_put(subscriber); } static struct tipc_subscription *tipc_subscrp_create(struct net *net, struct tipc_subscr *s, int swap) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_subscription *sub; u32 filter = htohl(s->filter, swap); /* Refuse subscription if global limit exceeded */ if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) { pr_warn("Subscription rejected, limit reached (%u)\n", TIPC_MAX_SUBSCRIPTIONS); return NULL; } /* Allocate subscription object */ sub = kmalloc(sizeof(*sub), GFP_ATOMIC); if (!sub) { pr_warn("Subscription rejected, no memory\n"); return NULL; } /* Initialize subscription object */ sub->net = net; if (((filter & TIPC_SUB_PORTS) && (filter & TIPC_SUB_SERVICE)) || (htohl(s->seq.lower, swap) > htohl(s->seq.upper, swap))) { pr_warn("Subscription rejected, illegal request\n"); kfree(sub); return NULL; } sub->swap = swap; memcpy(&sub->evt.s, s, sizeof(*s)); atomic_inc(&tn->subscription_count); kref_init(&sub->kref); return sub; } static void tipc_subscrp_subscribe(struct net *net, struct tipc_subscr *s, struct tipc_subscriber *subscriber, int swap) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_subscription *sub = NULL; u32 timeout; sub = tipc_subscrp_create(net, s, swap); if (!sub) return tipc_conn_terminate(tn->topsrv, subscriber->conid); spin_lock_bh(&subscriber->lock); list_add(&sub->subscrp_list, &subscriber->subscrp_list); sub->subscriber = subscriber; tipc_nametbl_subscribe(sub); tipc_subscrb_get(subscriber); spin_unlock_bh(&subscriber->lock); setup_timer(&sub->timer, tipc_subscrp_timeout, (unsigned long)sub); timeout = htohl(sub->evt.s.timeout, swap); if (timeout != TIPC_WAIT_FOREVER) mod_timer(&sub->timer, jiffies + msecs_to_jiffies(timeout)); } /* Handle one termination request for the subscriber */ static void tipc_subscrb_release_cb(int conid, void *usr_data) { tipc_subscrb_delete((struct tipc_subscriber *)usr_data); } /* Handle one request to create a new subscription for the subscriber */ static void tipc_subscrb_rcv_cb(struct net *net, int conid, struct sockaddr_tipc *addr, void *usr_data, void *buf, size_t len) { struct tipc_subscriber *subscriber = usr_data; struct tipc_subscr *s = (struct tipc_subscr *)buf; int swap; /* Determine subscriber's endianness */ swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE | TIPC_SUB_CANCEL)); /* Detect & process a subscription cancellation request */ if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) { s->filter &= ~htohl(TIPC_SUB_CANCEL, swap); return tipc_subscrp_cancel(s, subscriber); } tipc_subscrp_subscribe(net, s, subscriber, swap); } /* Handle one request to establish a new subscriber */ static void *tipc_subscrb_connect_cb(int conid) { return (void *)tipc_subscrb_create(conid); } int tipc_topsrv_start(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); const char name[] = "topology_server"; struct tipc_server *topsrv; struct sockaddr_tipc *saddr; saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC); if (!saddr) return -ENOMEM; saddr->family = AF_TIPC; saddr->addrtype = TIPC_ADDR_NAMESEQ; saddr->addr.nameseq.type = TIPC_TOP_SRV; saddr->addr.nameseq.lower = TIPC_TOP_SRV; saddr->addr.nameseq.upper = TIPC_TOP_SRV; saddr->scope = TIPC_NODE_SCOPE; topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC); if (!topsrv) { kfree(saddr); return -ENOMEM; } topsrv->net = net; topsrv->saddr = saddr; topsrv->imp = TIPC_CRITICAL_IMPORTANCE; topsrv->type = SOCK_SEQPACKET; topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr); topsrv->tipc_conn_recvmsg = tipc_subscrb_rcv_cb; topsrv->tipc_conn_new = tipc_subscrb_connect_cb; topsrv->tipc_conn_release = tipc_subscrb_release_cb; strscpy(topsrv->name, name, sizeof(topsrv->name)); tn->topsrv = topsrv; atomic_set(&tn->subscription_count, 0); return tipc_server_start(topsrv); } void tipc_topsrv_stop(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_server *topsrv = tn->topsrv; tipc_server_stop(topsrv); kfree(topsrv->saddr); kfree(topsrv); }
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