| /* |
| * 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); |
| } |