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0f6e8aab94
Use strlcpy instead of strncpy to let nd_ps_desc always NUL terminated. Change nd_ps_desc in nd_struct struct to MAX_DESC_LEN to avoid the confusion (the related length checking also need be changed to MAX_DESC_LEN - 1). Signed-off-by: Chen Gang <gang.chen@asianux.com> Acked-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
534 lines
11 KiB
C
534 lines
11 KiB
C
/*
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*
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* Copyright 1999 Digi International (www.digi.com)
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* James Puzzo <jamesp at digi dot 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, EXPRESS OR IMPLIED; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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*/
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/*
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*
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* Filename:
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*
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* dgrp_dpa_ops.c
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*
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* Description:
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*
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* Handle the file operations required for the "dpa" devices.
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* Includes those functions required to register the "dpa" devices
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* in "/proc".
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*
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* Author:
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*
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* James A. Puzzo
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*
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*/
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/tty.h>
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#include <linux/poll.h>
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#include <linux/cred.h>
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#include <linux/sched.h>
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#include <linux/ratelimit.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include "dgrp_common.h"
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/* File operation declarations */
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static int dgrp_dpa_open(struct inode *, struct file *);
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static int dgrp_dpa_release(struct inode *, struct file *);
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static ssize_t dgrp_dpa_read(struct file *, char __user *, size_t, loff_t *);
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static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg);
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static unsigned int dgrp_dpa_select(struct file *, struct poll_table_struct *);
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const struct file_operations dgrp_dpa_ops = {
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.owner = THIS_MODULE,
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.read = dgrp_dpa_read,
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.poll = dgrp_dpa_select,
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.unlocked_ioctl = dgrp_dpa_ioctl,
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.open = dgrp_dpa_open,
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.release = dgrp_dpa_release,
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};
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struct digi_node {
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uint nd_state; /* Node state: 1 = up, 0 = down. */
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uint nd_chan_count; /* Number of channels found */
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uint nd_tx_byte; /* Tx data count */
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uint nd_rx_byte; /* RX data count */
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u8 nd_ps_desc[MAX_DESC_LEN]; /* Description from PS */
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};
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#define DIGI_GETNODE (('d'<<8) | 249) /* get board info */
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struct digi_chan {
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uint ch_port; /* Port number to get info on */
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uint ch_open; /* 1 if open, 0 if not */
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uint ch_txcount; /* TX data count */
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uint ch_rxcount; /* RX data count */
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uint ch_s_brate; /* Realport BRATE */
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uint ch_s_estat; /* Realport ELAST */
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uint ch_s_cflag; /* Realport CFLAG */
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uint ch_s_iflag; /* Realport IFLAG */
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uint ch_s_oflag; /* Realport OFLAG */
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uint ch_s_xflag; /* Realport XFLAG */
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uint ch_s_mstat; /* Realport MLAST */
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};
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#define DIGI_GETCHAN (('d'<<8) | 248) /* get channel info */
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struct digi_vpd {
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int vpd_len;
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char vpd_data[VPDSIZE];
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};
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#define DIGI_GETVPD (('d'<<8) | 246) /* get VPD info */
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struct digi_debug {
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int onoff;
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int port;
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};
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#define DIGI_SETDEBUG (('d'<<8) | 247) /* set debug info */
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/*
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* dgrp_dpa_open -- open the DPA device for a particular PortServer
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*/
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static int dgrp_dpa_open(struct inode *inode, struct file *file)
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{
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struct nd_struct *nd;
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int rtn = 0;
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rtn = try_module_get(THIS_MODULE);
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if (!rtn)
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return -ENXIO;
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rtn = 0;
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if (!capable(CAP_SYS_ADMIN)) {
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rtn = -EPERM;
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goto done;
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}
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/*
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* Make sure that the "private_data" field hasn't already been used.
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*/
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if (file->private_data) {
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rtn = -EINVAL;
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goto done;
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}
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/*
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* Get the node pointer, and fail if it doesn't exist.
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*/
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nd = PDE_DATA(inode);
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if (!nd) {
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rtn = -ENXIO;
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goto done;
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}
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file->private_data = (void *) nd;
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/*
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* Allocate the DPA buffer.
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*/
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if (nd->nd_dpa_buf) {
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rtn = -EBUSY;
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} else {
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nd->nd_dpa_buf = kmalloc(DPA_MAX, GFP_KERNEL);
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if (!nd->nd_dpa_buf) {
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rtn = -ENOMEM;
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} else {
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nd->nd_dpa_out = 0;
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nd->nd_dpa_in = 0;
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nd->nd_dpa_lbolt = jiffies;
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}
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}
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done:
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if (rtn)
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module_put(THIS_MODULE);
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return rtn;
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}
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/*
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* dgrp_dpa_release -- close the DPA device for a particular PortServer
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*/
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static int dgrp_dpa_release(struct inode *inode, struct file *file)
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{
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struct nd_struct *nd;
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u8 *buf;
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unsigned long lock_flags;
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/*
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* Get the node pointer, and quit if it doesn't exist.
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*/
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nd = (struct nd_struct *)(file->private_data);
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if (!nd)
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goto done;
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/*
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* Free the dpa buffer.
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*/
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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buf = nd->nd_dpa_buf;
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nd->nd_dpa_buf = NULL;
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nd->nd_dpa_out = nd->nd_dpa_in;
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/*
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* Wakeup any thread waiting for buffer space.
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*/
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if (nd->nd_dpa_flag & DPA_WAIT_SPACE) {
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nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
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wake_up_interruptible(&nd->nd_dpa_wqueue);
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}
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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kfree(buf);
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done:
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module_put(THIS_MODULE);
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file->private_data = NULL;
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return 0;
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}
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/*
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* dgrp_dpa_read
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*
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* Copy data from the monitoring buffer to the user, freeing space
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* in the monitoring buffer for more messages
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*/
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static ssize_t dgrp_dpa_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct nd_struct *nd;
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int n;
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int r;
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int offset = 0;
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int res = 0;
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ssize_t rtn;
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unsigned long lock_flags;
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/*
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* Get the node pointer, and quit if it doesn't exist.
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*/
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nd = (struct nd_struct *)(file->private_data);
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if (!nd)
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return -ENXIO;
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/*
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* Wait for some data to appear in the buffer.
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*/
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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for (;;) {
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n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
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if (n != 0)
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break;
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nd->nd_dpa_flag |= DPA_WAIT_DATA;
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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/*
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* Go to sleep waiting until the condition becomes true.
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*/
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rtn = wait_event_interruptible(nd->nd_dpa_wqueue,
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((nd->nd_dpa_flag & DPA_WAIT_DATA) == 0));
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if (rtn)
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return rtn;
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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}
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/*
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* Read whatever is there.
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*/
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if (n > count)
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n = count;
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res = n;
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r = DPA_MAX - nd->nd_dpa_out;
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if (r <= n) {
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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rtn = copy_to_user((void __user *)buf,
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nd->nd_dpa_buf + nd->nd_dpa_out, r);
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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if (rtn) {
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rtn = -EFAULT;
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goto done;
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}
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nd->nd_dpa_out = 0;
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n -= r;
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offset = r;
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}
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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rtn = copy_to_user((void __user *)buf + offset,
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nd->nd_dpa_buf + nd->nd_dpa_out, n);
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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if (rtn) {
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rtn = -EFAULT;
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goto done;
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}
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nd->nd_dpa_out += n;
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*ppos += res;
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rtn = res;
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/*
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* Wakeup any thread waiting for buffer space.
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*/
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n = (nd->nd_dpa_in - nd->nd_dpa_out) & DPA_MASK;
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if (nd->nd_dpa_flag & DPA_WAIT_SPACE &&
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(DPA_MAX - n) > DPA_HIGH_WATER) {
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nd->nd_dpa_flag &= ~DPA_WAIT_SPACE;
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wake_up_interruptible(&nd->nd_dpa_wqueue);
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}
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done:
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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return rtn;
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}
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static unsigned int dgrp_dpa_select(struct file *file,
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struct poll_table_struct *table)
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{
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unsigned int retval = 0;
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struct nd_struct *nd = file->private_data;
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if (nd->nd_dpa_out != nd->nd_dpa_in)
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retval |= POLLIN | POLLRDNORM; /* Conditionally readable */
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retval |= POLLOUT | POLLWRNORM; /* Always writeable */
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return retval;
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}
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static long dgrp_dpa_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct nd_struct *nd;
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struct digi_chan getchan;
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struct digi_node getnode;
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struct ch_struct *ch;
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struct digi_debug setdebug;
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struct digi_vpd vpd;
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unsigned int port;
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void __user *uarg = (void __user *) arg;
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nd = file->private_data;
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switch (cmd) {
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case DIGI_GETCHAN:
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if (copy_from_user(&getchan, uarg, sizeof(struct digi_chan)))
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return -EFAULT;
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port = getchan.ch_port;
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if (port > nd->nd_chan_count)
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return -EINVAL;
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ch = nd->nd_chan + port;
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getchan.ch_open = (ch->ch_open_count > 0) ? 1 : 0;
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getchan.ch_txcount = ch->ch_txcount;
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getchan.ch_rxcount = ch->ch_rxcount;
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getchan.ch_s_brate = ch->ch_s_brate;
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getchan.ch_s_estat = ch->ch_s_elast;
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getchan.ch_s_cflag = ch->ch_s_cflag;
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getchan.ch_s_iflag = ch->ch_s_iflag;
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getchan.ch_s_oflag = ch->ch_s_oflag;
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getchan.ch_s_xflag = ch->ch_s_xflag;
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getchan.ch_s_mstat = ch->ch_s_mlast;
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if (copy_to_user(uarg, &getchan, sizeof(struct digi_chan)))
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return -EFAULT;
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break;
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case DIGI_GETNODE:
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getnode.nd_state = (nd->nd_state & NS_READY) ? 1 : 0;
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getnode.nd_chan_count = nd->nd_chan_count;
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getnode.nd_tx_byte = nd->nd_tx_byte;
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getnode.nd_rx_byte = nd->nd_rx_byte;
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memset(&getnode.nd_ps_desc, 0, MAX_DESC_LEN);
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strlcpy(getnode.nd_ps_desc, nd->nd_ps_desc, MAX_DESC_LEN);
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if (copy_to_user(uarg, &getnode, sizeof(struct digi_node)))
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return -EFAULT;
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break;
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case DIGI_SETDEBUG:
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if (copy_from_user(&setdebug, uarg, sizeof(struct digi_debug)))
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return -EFAULT;
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nd->nd_dpa_debug = setdebug.onoff;
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nd->nd_dpa_port = setdebug.port;
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break;
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case DIGI_GETVPD:
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memset(&vpd, 0, sizeof(vpd));
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if (nd->nd_vpd_len > 0) {
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vpd.vpd_len = nd->nd_vpd_len;
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memcpy(&vpd.vpd_data, &nd->nd_vpd, nd->nd_vpd_len);
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} else {
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vpd.vpd_len = 0;
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}
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if (copy_to_user(uarg, &vpd, sizeof(struct digi_vpd)))
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return -EFAULT;
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break;
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}
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return 0;
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}
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/**
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* dgrp_dpa() -- send data to the device monitor queue
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* @nd: pointer to a node structure
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* @buf: buffer of data to copy to the monitoring buffer
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* @len: number of bytes to transfer to the buffer
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*
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* Called by the net device routines to send data to the device
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* monitor queue. If the device monitor buffer is too full to
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* accept the data, it waits until the buffer is ready.
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*/
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static void dgrp_dpa(struct nd_struct *nd, u8 *buf, int nbuf)
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{
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int n;
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int r;
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unsigned long lock_flags;
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/*
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* Grab DPA lock.
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*/
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spin_lock_irqsave(&nd->nd_dpa_lock, lock_flags);
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/*
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* Loop while data remains.
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*/
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while (nbuf > 0 && nd->nd_dpa_buf != NULL) {
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n = (nd->nd_dpa_out - nd->nd_dpa_in - 1) & DPA_MASK;
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/*
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* Enforce flow control on the DPA device.
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*/
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if (n < (DPA_MAX - DPA_HIGH_WATER))
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nd->nd_dpa_flag |= DPA_WAIT_SPACE;
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/*
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* This should never happen, as the flow control above
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* should have stopped things before they got to this point.
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*/
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if (n == 0) {
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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return;
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}
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/*
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* Copy as much data as will fit.
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*/
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if (n > nbuf)
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n = nbuf;
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r = DPA_MAX - nd->nd_dpa_in;
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if (r <= n) {
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memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, r);
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n -= r;
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nd->nd_dpa_in = 0;
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buf += r;
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nbuf -= r;
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}
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memcpy(nd->nd_dpa_buf + nd->nd_dpa_in, buf, n);
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nd->nd_dpa_in += n;
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buf += n;
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nbuf -= n;
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if (nd->nd_dpa_in >= DPA_MAX)
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pr_info_ratelimited("%s - nd->nd_dpa_in (%i) >= DPA_MAX\n",
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__func__, nd->nd_dpa_in);
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/*
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* Wakeup any thread waiting for data
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*/
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if (nd->nd_dpa_flag & DPA_WAIT_DATA) {
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nd->nd_dpa_flag &= ~DPA_WAIT_DATA;
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wake_up_interruptible(&nd->nd_dpa_wqueue);
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}
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}
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/*
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* Release the DPA lock.
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*/
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spin_unlock_irqrestore(&nd->nd_dpa_lock, lock_flags);
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}
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/**
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* dgrp_monitor_data() -- builds a DPA data packet
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* @nd: pointer to a node structure
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* @type: type of message to be logged in the DPA buffer
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* @buf: buffer of data to be logged in the DPA buffer
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* @size -- number of bytes in the "buf" buffer
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*/
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void dgrp_dpa_data(struct nd_struct *nd, int type, u8 *buf, int size)
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{
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u8 header[5];
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header[0] = type;
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put_unaligned_be32(size, header + 1);
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dgrp_dpa(nd, header, sizeof(header));
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dgrp_dpa(nd, buf, size);
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}
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