![Paul Gortmaker](/assets/img/avatar_default.png)
No runtime code changes here. Just a realign of the function arguments to start where the 1st one was, and fit as many args as can be put in an 80 char line. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
390 lines
11 KiB
C
390 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 "port.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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* @conid: connection identifier to server connecting to subscriber
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* @lock: controll access to subscriber
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* @subscription_list: list of subscription objects for this subscriber
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*/
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struct tipc_subscriber {
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int conid;
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spinlock_t lock;
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struct list_head subscription_list;
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};
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static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
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void *usr_data, void *buf, size_t len);
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static void *subscr_named_msg_event(int conid);
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static void subscr_conn_shutdown_event(int conid, void *usr_data);
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static atomic_t subscription_count = ATOMIC_INIT(0);
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static struct sockaddr_tipc topsrv_addr __read_mostly = {
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.family = AF_TIPC,
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.addrtype = TIPC_ADDR_NAMESEQ,
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.addr.nameseq.type = TIPC_TOP_SRV,
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.addr.nameseq.lower = TIPC_TOP_SRV,
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.addr.nameseq.upper = TIPC_TOP_SRV,
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.scope = TIPC_NODE_SCOPE
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};
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static struct tipc_server topsrv __read_mostly = {
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.saddr = &topsrv_addr,
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.imp = TIPC_CRITICAL_IMPORTANCE,
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.type = SOCK_SEQPACKET,
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.max_rcvbuf_size = sizeof(struct tipc_subscr),
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.name = "topology_server",
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.tipc_conn_recvmsg = subscr_conn_msg_event,
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.tipc_conn_new = subscr_named_msg_event,
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.tipc_conn_shutdown = subscr_conn_shutdown_event,
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};
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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 subscr_send_event(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)
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{
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struct tipc_subscriber *subscriber = sub->subscriber;
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struct kvec msg_sect;
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int ret;
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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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ret = tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL,
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msg_sect.iov_base, msg_sect.iov_len);
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if (ret < 0)
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pr_err("Sending subscription event failed, no memory\n");
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}
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/**
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* tipc_subscr_overlap - test for subscription overlap with the 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_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
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u32 found_upper)
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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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* tipc_subscr_report_overlap - issue event if there is subscription overlap
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*
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* Protected by nameseq.lock in name_table.c
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*/
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void tipc_subscr_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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if (!tipc_subscr_overlap(sub, found_lower, found_upper))
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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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static void subscr_timeout(struct tipc_subscription *sub)
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{
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struct tipc_subscriber *subscriber = sub->subscriber;
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/* The spin lock per subscriber is used to protect its members */
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spin_lock_bh(&subscriber->lock);
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/* Validate if the connection related to the subscriber is
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* closed (in case subscriber is terminating)
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*/
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if (subscriber->conid == 0) {
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spin_unlock_bh(&subscriber->lock);
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return;
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}
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/* Validate timeout (in case subscription is being cancelled) */
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if (sub->timeout == TIPC_WAIT_FOREVER) {
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spin_unlock_bh(&subscriber->lock);
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return;
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}
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/* Unlink subscription from name table */
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tipc_nametbl_unsubscribe(sub);
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/* Unlink subscription from subscriber */
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list_del(&sub->subscription_list);
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spin_unlock_bh(&subscriber->lock);
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/* Notify subscriber of timeout */
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subscr_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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/* Now destroy subscription */
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k_term_timer(&sub->timer);
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kfree(sub);
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atomic_dec(&subscription_count);
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}
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/**
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* subscr_del - delete a subscription within a subscription list
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*
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* Called with subscriber lock held.
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*/
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static void subscr_del(struct tipc_subscription *sub)
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{
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tipc_nametbl_unsubscribe(sub);
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list_del(&sub->subscription_list);
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kfree(sub);
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atomic_dec(&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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* Note: Must call it in process context since it might sleep.
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*/
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static void subscr_terminate(struct tipc_subscriber *subscriber)
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{
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tipc_conn_terminate(&topsrv, subscriber->conid);
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}
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static void subscr_release(struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub;
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struct tipc_subscription *sub_temp;
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spin_lock_bh(&subscriber->lock);
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/* Invalidate subscriber reference */
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subscriber->conid = 0;
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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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spin_unlock_bh(&subscriber->lock);
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k_cancel_timer(&sub->timer);
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k_term_timer(&sub->timer);
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spin_lock_bh(&subscriber->lock);
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}
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subscr_del(sub);
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}
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spin_unlock_bh(&subscriber->lock);
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/* Now destroy subscriber */
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kfree(subscriber);
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}
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/**
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* subscr_cancel - handle subscription cancellation request
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*
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* Called with subscriber lock held. Routine must temporarily release lock
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* to enable the subscription timeout routine 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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*
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* Note that fields of 's' use subscriber's endianness!
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*/
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static void subscr_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;
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struct tipc_subscription *sub_temp;
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int found = 0;
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/* Find first matching subscription, exit if not found */
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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 (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
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found = 1;
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break;
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}
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}
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if (!found)
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return;
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/* Cancel subscription timer (if used), then delete subscription */
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if (sub->timeout != TIPC_WAIT_FOREVER) {
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sub->timeout = TIPC_WAIT_FOREVER;
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spin_unlock_bh(&subscriber->lock);
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k_cancel_timer(&sub->timer);
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k_term_timer(&sub->timer);
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spin_lock_bh(&subscriber->lock);
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}
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subscr_del(sub);
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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 lock held.
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*/
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static struct tipc_subscription *subscr_subscribe(struct tipc_subscr *s,
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struct tipc_subscriber *subscriber)
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{
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struct tipc_subscription *sub;
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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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/* 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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subscr_cancel(s, subscriber);
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return NULL;
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}
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/* Refuse subscription if global limit exceeded */
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if (atomic_read(&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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subscr_terminate(subscriber);
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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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subscr_terminate(subscriber);
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return NULL;
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}
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/* Initialize subscription object */
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sub->seq.type = htohl(s->seq.type, swap);
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sub->seq.lower = htohl(s->seq.lower, swap);
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sub->seq.upper = htohl(s->seq.upper, swap);
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sub->timeout = htohl(s->timeout, swap);
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sub->filter = htohl(s->filter, 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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pr_warn("Subscription rejected, illegal request\n");
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kfree(sub);
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subscr_terminate(subscriber);
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return NULL;
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}
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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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sub->subscriber = subscriber;
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sub->swap = swap;
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memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
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atomic_inc(&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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return sub;
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}
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/* Handle one termination request for the subscriber */
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static void subscr_conn_shutdown_event(int conid, void *usr_data)
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{
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subscr_release((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 subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
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void *usr_data, 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_subscription *sub;
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spin_lock_bh(&subscriber->lock);
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sub = subscr_subscribe((struct tipc_subscr *)buf, subscriber);
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if (sub)
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tipc_nametbl_subscribe(sub);
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spin_unlock_bh(&subscriber->lock);
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}
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/* Handle one request to establish a new subscriber */
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static void *subscr_named_msg_event(int conid)
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{
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struct tipc_subscriber *subscriber;
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/* Create subscriber object */
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subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC);
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if (subscriber == NULL) {
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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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INIT_LIST_HEAD(&subscriber->subscription_list);
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subscriber->conid = conid;
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spin_lock_init(&subscriber->lock);
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return (void *)subscriber;
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}
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int tipc_subscr_start(void)
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{
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return tipc_server_start(&topsrv);
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}
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void tipc_subscr_stop(void)
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{
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tipc_server_stop(&topsrv);
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}
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