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1ffaa640c6
The smsgiucv_app driver registers a callback with the smsgiucv driver to receive z/VM CP special messages (SMSG) starting with "APP". When the callback is called for special messages, the driver creates an uevent for the received message. The uevent consists of additional environment data containing the message prefix ("APP"), message sender, and message content. udev rules can be used to trigger application specific actions through matching the content or sender of the special message. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
252 lines
6.1 KiB
C
252 lines
6.1 KiB
C
/*
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* IUCV special message driver
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*
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* Copyright IBM Corp. 2003, 2009
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*
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <net/iucv/iucv.h>
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#include <asm/cpcmd.h>
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#include <asm/ebcdic.h>
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#include "smsgiucv.h"
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struct smsg_callback {
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struct list_head list;
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const char *prefix;
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int len;
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void (*callback)(const char *from, char *str);
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};
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MODULE_AUTHOR
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("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
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MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
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static struct iucv_path *smsg_path;
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/* dummy device used as trigger for PM functions */
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static struct device *smsg_dev;
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static DEFINE_SPINLOCK(smsg_list_lock);
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static LIST_HEAD(smsg_list);
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static int smsg_path_pending(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
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static void smsg_message_pending(struct iucv_path *, struct iucv_message *);
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static struct iucv_handler smsg_handler = {
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.path_pending = smsg_path_pending,
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.message_pending = smsg_message_pending,
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};
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static int smsg_path_pending(struct iucv_path *path, u8 ipvmid[8],
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u8 ipuser[16])
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{
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if (strncmp(ipvmid, "*MSG ", sizeof(ipvmid)) != 0)
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return -EINVAL;
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/* Path pending from *MSG. */
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return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL);
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}
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static void smsg_message_pending(struct iucv_path *path,
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struct iucv_message *msg)
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{
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struct smsg_callback *cb;
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unsigned char *buffer;
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unsigned char sender[9];
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int rc, i;
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buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA);
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if (!buffer) {
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iucv_message_reject(path, msg);
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return;
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}
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rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
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if (rc == 0) {
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buffer[msg->length] = 0;
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EBCASC(buffer, msg->length);
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memcpy(sender, buffer, 8);
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sender[8] = 0;
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/* Remove trailing whitespace from the sender name. */
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for (i = 7; i >= 0; i--) {
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if (sender[i] != ' ' && sender[i] != '\t')
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break;
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sender[i] = 0;
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}
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spin_lock(&smsg_list_lock);
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list_for_each_entry(cb, &smsg_list, list)
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if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
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cb->callback(sender, buffer + 8);
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break;
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}
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spin_unlock(&smsg_list_lock);
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}
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kfree(buffer);
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}
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int smsg_register_callback(const char *prefix,
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void (*callback)(const char *from, char *str))
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{
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struct smsg_callback *cb;
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cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
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if (!cb)
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return -ENOMEM;
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cb->prefix = prefix;
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cb->len = strlen(prefix);
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cb->callback = callback;
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spin_lock_bh(&smsg_list_lock);
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list_add_tail(&cb->list, &smsg_list);
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spin_unlock_bh(&smsg_list_lock);
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return 0;
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}
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void smsg_unregister_callback(const char *prefix,
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void (*callback)(const char *from,
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char *str))
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{
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struct smsg_callback *cb, *tmp;
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spin_lock_bh(&smsg_list_lock);
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cb = NULL;
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list_for_each_entry(tmp, &smsg_list, list)
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if (tmp->callback == callback &&
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strcmp(tmp->prefix, prefix) == 0) {
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cb = tmp;
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list_del(&cb->list);
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break;
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}
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spin_unlock_bh(&smsg_list_lock);
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kfree(cb);
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}
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static int smsg_pm_freeze(struct device *dev)
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{
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "smsg_pm_freeze\n");
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#endif
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if (smsg_path)
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iucv_path_sever(smsg_path, NULL);
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return 0;
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}
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static int smsg_pm_restore_thaw(struct device *dev)
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{
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int rc;
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#ifdef CONFIG_PM_DEBUG
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printk(KERN_WARNING "smsg_pm_restore_thaw\n");
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#endif
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if (smsg_path) {
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memset(smsg_path, 0, sizeof(*smsg_path));
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smsg_path->msglim = 255;
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smsg_path->flags = 0;
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rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
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NULL, NULL, NULL);
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#ifdef CONFIG_PM_DEBUG
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if (rc)
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printk(KERN_ERR
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"iucv_path_connect returned with rc %i\n", rc);
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#endif
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cpcmd("SET SMSG IUCV", NULL, 0, NULL);
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}
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return 0;
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}
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static const struct dev_pm_ops smsg_pm_ops = {
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.freeze = smsg_pm_freeze,
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.thaw = smsg_pm_restore_thaw,
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.restore = smsg_pm_restore_thaw,
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};
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static struct device_driver smsg_driver = {
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.owner = THIS_MODULE,
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.name = SMSGIUCV_DRV_NAME,
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.bus = &iucv_bus,
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.pm = &smsg_pm_ops,
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};
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static void __exit smsg_exit(void)
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{
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cpcmd("SET SMSG IUCV", NULL, 0, NULL);
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device_unregister(smsg_dev);
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iucv_unregister(&smsg_handler, 1);
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driver_unregister(&smsg_driver);
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}
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static int __init smsg_init(void)
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{
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int rc;
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if (!MACHINE_IS_VM) {
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rc = -EPROTONOSUPPORT;
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goto out;
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}
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rc = driver_register(&smsg_driver);
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if (rc != 0)
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goto out;
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rc = iucv_register(&smsg_handler, 1);
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if (rc)
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goto out_driver;
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smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
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if (!smsg_path) {
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rc = -ENOMEM;
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goto out_register;
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}
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rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
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NULL, NULL, NULL);
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if (rc)
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goto out_free_path;
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smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
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if (!smsg_dev) {
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rc = -ENOMEM;
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goto out_free_path;
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}
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dev_set_name(smsg_dev, "smsg_iucv");
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smsg_dev->bus = &iucv_bus;
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smsg_dev->parent = iucv_root;
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smsg_dev->release = (void (*)(struct device *))kfree;
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smsg_dev->driver = &smsg_driver;
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rc = device_register(smsg_dev);
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if (rc)
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goto out_put;
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cpcmd("SET SMSG IUCV", NULL, 0, NULL);
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return 0;
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out_put:
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put_device(smsg_dev);
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out_free_path:
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iucv_path_free(smsg_path);
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smsg_path = NULL;
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out_register:
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iucv_unregister(&smsg_handler, 1);
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out_driver:
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driver_unregister(&smsg_driver);
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out:
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return rc;
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}
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module_init(smsg_init);
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module_exit(smsg_exit);
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(smsg_register_callback);
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EXPORT_SYMBOL(smsg_unregister_callback);
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