mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:26:38 +07:00
963a185539
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
390 lines
11 KiB
C
390 lines
11 KiB
C
/*
|
|
* 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 "port.h"
|
|
#include "subscr.h"
|
|
|
|
/**
|
|
* struct tipc_subscriber - TIPC network topology subscriber
|
|
* @conid: connection identifier to server connecting to subscriber
|
|
* @lock: control access to subscriber
|
|
* @subscription_list: list of subscription objects for this subscriber
|
|
*/
|
|
struct tipc_subscriber {
|
|
int conid;
|
|
spinlock_t lock;
|
|
struct list_head subscription_list;
|
|
};
|
|
|
|
static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
|
|
void *usr_data, void *buf, size_t len);
|
|
static void *subscr_named_msg_event(int conid);
|
|
static void subscr_conn_shutdown_event(int conid, void *usr_data);
|
|
|
|
static atomic_t subscription_count = ATOMIC_INIT(0);
|
|
|
|
static struct sockaddr_tipc topsrv_addr __read_mostly = {
|
|
.family = AF_TIPC,
|
|
.addrtype = TIPC_ADDR_NAMESEQ,
|
|
.addr.nameseq.type = TIPC_TOP_SRV,
|
|
.addr.nameseq.lower = TIPC_TOP_SRV,
|
|
.addr.nameseq.upper = TIPC_TOP_SRV,
|
|
.scope = TIPC_NODE_SCOPE
|
|
};
|
|
|
|
static struct tipc_server topsrv __read_mostly = {
|
|
.saddr = &topsrv_addr,
|
|
.imp = TIPC_CRITICAL_IMPORTANCE,
|
|
.type = SOCK_SEQPACKET,
|
|
.max_rcvbuf_size = sizeof(struct tipc_subscr),
|
|
.name = "topology_server",
|
|
.tipc_conn_recvmsg = subscr_conn_msg_event,
|
|
.tipc_conn_new = subscr_named_msg_event,
|
|
.tipc_conn_shutdown = subscr_conn_shutdown_event,
|
|
};
|
|
|
|
/**
|
|
* 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 subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
|
|
u32 found_upper, u32 event, u32 port_ref,
|
|
u32 node)
|
|
{
|
|
struct tipc_subscriber *subscriber = sub->subscriber;
|
|
struct kvec msg_sect;
|
|
int ret;
|
|
|
|
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);
|
|
ret = tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL,
|
|
msg_sect.iov_base, msg_sect.iov_len);
|
|
if (ret < 0)
|
|
pr_err("Sending subscription event failed, no memory\n");
|
|
}
|
|
|
|
/**
|
|
* tipc_subscr_overlap - test for subscription overlap with the given values
|
|
*
|
|
* Returns 1 if there is overlap, otherwise 0.
|
|
*/
|
|
int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
|
|
u32 found_upper)
|
|
{
|
|
if (found_lower < sub->seq.lower)
|
|
found_lower = sub->seq.lower;
|
|
if (found_upper > sub->seq.upper)
|
|
found_upper = sub->seq.upper;
|
|
if (found_lower > found_upper)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* tipc_subscr_report_overlap - issue event if there is subscription overlap
|
|
*
|
|
* Protected by nameseq.lock in name_table.c
|
|
*/
|
|
void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
|
|
u32 found_upper, u32 event, u32 port_ref,
|
|
u32 node, int must)
|
|
{
|
|
if (!tipc_subscr_overlap(sub, found_lower, found_upper))
|
|
return;
|
|
if (!must && !(sub->filter & TIPC_SUB_PORTS))
|
|
return;
|
|
|
|
subscr_send_event(sub, found_lower, found_upper, event, port_ref, node);
|
|
}
|
|
|
|
static void subscr_timeout(struct tipc_subscription *sub)
|
|
{
|
|
struct tipc_subscriber *subscriber = sub->subscriber;
|
|
|
|
/* The spin lock per subscriber is used to protect its members */
|
|
spin_lock_bh(&subscriber->lock);
|
|
|
|
/* Validate if the connection related to the subscriber is
|
|
* closed (in case subscriber is terminating)
|
|
*/
|
|
if (subscriber->conid == 0) {
|
|
spin_unlock_bh(&subscriber->lock);
|
|
return;
|
|
}
|
|
|
|
/* Validate timeout (in case subscription is being cancelled) */
|
|
if (sub->timeout == TIPC_WAIT_FOREVER) {
|
|
spin_unlock_bh(&subscriber->lock);
|
|
return;
|
|
}
|
|
|
|
/* Unlink subscription from name table */
|
|
tipc_nametbl_unsubscribe(sub);
|
|
|
|
/* Unlink subscription from subscriber */
|
|
list_del(&sub->subscription_list);
|
|
|
|
spin_unlock_bh(&subscriber->lock);
|
|
|
|
/* Notify subscriber of timeout */
|
|
subscr_send_event(sub, sub->evt.s.seq.lower, sub->evt.s.seq.upper,
|
|
TIPC_SUBSCR_TIMEOUT, 0, 0);
|
|
|
|
/* Now destroy subscription */
|
|
k_term_timer(&sub->timer);
|
|
kfree(sub);
|
|
atomic_dec(&subscription_count);
|
|
}
|
|
|
|
/**
|
|
* subscr_del - delete a subscription within a subscription list
|
|
*
|
|
* Called with subscriber lock held.
|
|
*/
|
|
static void subscr_del(struct tipc_subscription *sub)
|
|
{
|
|
tipc_nametbl_unsubscribe(sub);
|
|
list_del(&sub->subscription_list);
|
|
kfree(sub);
|
|
atomic_dec(&subscription_count);
|
|
}
|
|
|
|
/**
|
|
* subscr_terminate - terminate communication with a subscriber
|
|
*
|
|
* Note: Must call it in process context since it might sleep.
|
|
*/
|
|
static void subscr_terminate(struct tipc_subscriber *subscriber)
|
|
{
|
|
tipc_conn_terminate(&topsrv, subscriber->conid);
|
|
}
|
|
|
|
static void subscr_release(struct tipc_subscriber *subscriber)
|
|
{
|
|
struct tipc_subscription *sub;
|
|
struct tipc_subscription *sub_temp;
|
|
|
|
spin_lock_bh(&subscriber->lock);
|
|
|
|
/* Invalidate subscriber reference */
|
|
subscriber->conid = 0;
|
|
|
|
/* Destroy any existing subscriptions for subscriber */
|
|
list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
|
|
subscription_list) {
|
|
if (sub->timeout != TIPC_WAIT_FOREVER) {
|
|
spin_unlock_bh(&subscriber->lock);
|
|
k_cancel_timer(&sub->timer);
|
|
k_term_timer(&sub->timer);
|
|
spin_lock_bh(&subscriber->lock);
|
|
}
|
|
subscr_del(sub);
|
|
}
|
|
spin_unlock_bh(&subscriber->lock);
|
|
|
|
/* Now destroy subscriber */
|
|
kfree(subscriber);
|
|
}
|
|
|
|
/**
|
|
* subscr_cancel - handle subscription cancellation request
|
|
*
|
|
* Called with subscriber lock held. Routine must temporarily release lock
|
|
* to enable the subscription timeout routine to finish without deadlocking;
|
|
* the lock is then reclaimed to allow caller to release it upon return.
|
|
*
|
|
* Note that fields of 's' use subscriber's endianness!
|
|
*/
|
|
static void subscr_cancel(struct tipc_subscr *s,
|
|
struct tipc_subscriber *subscriber)
|
|
{
|
|
struct tipc_subscription *sub;
|
|
struct tipc_subscription *sub_temp;
|
|
int found = 0;
|
|
|
|
/* Find first matching subscription, exit if not found */
|
|
list_for_each_entry_safe(sub, sub_temp, &subscriber->subscription_list,
|
|
subscription_list) {
|
|
if (!memcmp(s, &sub->evt.s, sizeof(struct tipc_subscr))) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
return;
|
|
|
|
/* Cancel subscription timer (if used), then delete subscription */
|
|
if (sub->timeout != TIPC_WAIT_FOREVER) {
|
|
sub->timeout = TIPC_WAIT_FOREVER;
|
|
spin_unlock_bh(&subscriber->lock);
|
|
k_cancel_timer(&sub->timer);
|
|
k_term_timer(&sub->timer);
|
|
spin_lock_bh(&subscriber->lock);
|
|
}
|
|
subscr_del(sub);
|
|
}
|
|
|
|
/**
|
|
* subscr_subscribe - create subscription for subscriber
|
|
*
|
|
* Called with subscriber lock held.
|
|
*/
|
|
static struct tipc_subscription *subscr_subscribe(struct tipc_subscr *s,
|
|
struct tipc_subscriber *subscriber)
|
|
{
|
|
struct tipc_subscription *sub;
|
|
int swap;
|
|
|
|
/* Determine subscriber's endianness */
|
|
swap = !(s->filter & (TIPC_SUB_PORTS | TIPC_SUB_SERVICE));
|
|
|
|
/* Detect & process a subscription cancellation request */
|
|
if (s->filter & htohl(TIPC_SUB_CANCEL, swap)) {
|
|
s->filter &= ~htohl(TIPC_SUB_CANCEL, swap);
|
|
subscr_cancel(s, subscriber);
|
|
return NULL;
|
|
}
|
|
|
|
/* Refuse subscription if global limit exceeded */
|
|
if (atomic_read(&subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
|
|
pr_warn("Subscription rejected, limit reached (%u)\n",
|
|
TIPC_MAX_SUBSCRIPTIONS);
|
|
subscr_terminate(subscriber);
|
|
return NULL;
|
|
}
|
|
|
|
/* Allocate subscription object */
|
|
sub = kmalloc(sizeof(*sub), GFP_ATOMIC);
|
|
if (!sub) {
|
|
pr_warn("Subscription rejected, no memory\n");
|
|
subscr_terminate(subscriber);
|
|
return NULL;
|
|
}
|
|
|
|
/* Initialize subscription object */
|
|
sub->seq.type = htohl(s->seq.type, swap);
|
|
sub->seq.lower = htohl(s->seq.lower, swap);
|
|
sub->seq.upper = htohl(s->seq.upper, swap);
|
|
sub->timeout = htohl(s->timeout, swap);
|
|
sub->filter = htohl(s->filter, swap);
|
|
if ((!(sub->filter & TIPC_SUB_PORTS) ==
|
|
!(sub->filter & TIPC_SUB_SERVICE)) ||
|
|
(sub->seq.lower > sub->seq.upper)) {
|
|
pr_warn("Subscription rejected, illegal request\n");
|
|
kfree(sub);
|
|
subscr_terminate(subscriber);
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(&sub->nameseq_list);
|
|
list_add(&sub->subscription_list, &subscriber->subscription_list);
|
|
sub->subscriber = subscriber;
|
|
sub->swap = swap;
|
|
memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
|
|
atomic_inc(&subscription_count);
|
|
if (sub->timeout != TIPC_WAIT_FOREVER) {
|
|
k_init_timer(&sub->timer,
|
|
(Handler)subscr_timeout, (unsigned long)sub);
|
|
k_start_timer(&sub->timer, sub->timeout);
|
|
}
|
|
|
|
return sub;
|
|
}
|
|
|
|
/* Handle one termination request for the subscriber */
|
|
static void subscr_conn_shutdown_event(int conid, void *usr_data)
|
|
{
|
|
subscr_release((struct tipc_subscriber *)usr_data);
|
|
}
|
|
|
|
/* Handle one request to create a new subscription for the subscriber */
|
|
static void subscr_conn_msg_event(int conid, struct sockaddr_tipc *addr,
|
|
void *usr_data, void *buf, size_t len)
|
|
{
|
|
struct tipc_subscriber *subscriber = usr_data;
|
|
struct tipc_subscription *sub;
|
|
|
|
spin_lock_bh(&subscriber->lock);
|
|
sub = subscr_subscribe((struct tipc_subscr *)buf, subscriber);
|
|
if (sub)
|
|
tipc_nametbl_subscribe(sub);
|
|
spin_unlock_bh(&subscriber->lock);
|
|
}
|
|
|
|
|
|
/* Handle one request to establish a new subscriber */
|
|
static void *subscr_named_msg_event(int conid)
|
|
{
|
|
struct tipc_subscriber *subscriber;
|
|
|
|
/* Create subscriber object */
|
|
subscriber = kzalloc(sizeof(struct tipc_subscriber), GFP_ATOMIC);
|
|
if (subscriber == NULL) {
|
|
pr_warn("Subscriber rejected, no memory\n");
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(&subscriber->subscription_list);
|
|
subscriber->conid = conid;
|
|
spin_lock_init(&subscriber->lock);
|
|
|
|
return (void *)subscriber;
|
|
}
|
|
|
|
int tipc_subscr_start(void)
|
|
{
|
|
return tipc_server_start(&topsrv);
|
|
}
|
|
|
|
void tipc_subscr_stop(void)
|
|
{
|
|
tipc_server_stop(&topsrv);
|
|
}
|