mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
db33235622
ipwireless_send_packet() can only return 0 on success and -ENOMEM on error, the caller should check non zero for error condition Signed-off-by: Tong Zhang <ztong0001@gmail.com> Acked-by: David Sterba <dsterba@suse.com> Link: https://lore.kernel.org/r/20200821161942.36589-1-ztong0001@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
518 lines
13 KiB
C
518 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* IPWireless 3G PCMCIA Network Driver
|
|
*
|
|
* Original code
|
|
* by Stephen Blackheath <stephen@blacksapphire.com>,
|
|
* Ben Martel <benm@symmetric.co.nz>
|
|
*
|
|
* Copyrighted as follows:
|
|
* Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
|
|
*
|
|
* Various driver changes and rewrites, port to new kernels
|
|
* Copyright (C) 2006-2007 Jiri Kosina
|
|
*
|
|
* Misc code cleanups and updates
|
|
* Copyright (C) 2007 David Sterba
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/ppp_channel.h>
|
|
#include <linux/ppp_defs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ppp-ioctl.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#include "network.h"
|
|
#include "hardware.h"
|
|
#include "main.h"
|
|
#include "tty.h"
|
|
|
|
#define MAX_ASSOCIATED_TTYS 2
|
|
|
|
#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
|
|
|
|
struct ipw_network {
|
|
/* Hardware context, used for calls to hardware layer. */
|
|
struct ipw_hardware *hardware;
|
|
/* Context for kernel 'generic_ppp' functionality */
|
|
struct ppp_channel *ppp_channel;
|
|
/* tty context connected with IPW console */
|
|
struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
|
|
/* True if ppp needs waking up once we're ready to xmit */
|
|
int ppp_blocked;
|
|
/* Number of packets queued up in hardware module. */
|
|
int outgoing_packets_queued;
|
|
/* Spinlock to avoid interrupts during shutdown */
|
|
spinlock_t lock;
|
|
struct mutex close_lock;
|
|
|
|
/* PPP ioctl data, not actually used anywere */
|
|
unsigned int flags;
|
|
unsigned int rbits;
|
|
u32 xaccm[8];
|
|
u32 raccm;
|
|
int mru;
|
|
|
|
int shutting_down;
|
|
unsigned int ras_control_lines;
|
|
|
|
struct work_struct work_go_online;
|
|
struct work_struct work_go_offline;
|
|
};
|
|
|
|
static void notify_packet_sent(void *callback_data, unsigned int packet_length)
|
|
{
|
|
struct ipw_network *network = callback_data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
network->outgoing_packets_queued--;
|
|
if (network->ppp_channel != NULL) {
|
|
if (network->ppp_blocked) {
|
|
network->ppp_blocked = 0;
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
ppp_output_wakeup(network->ppp_channel);
|
|
if (ipwireless_debug)
|
|
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
|
|
": ppp unblocked\n");
|
|
} else
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
} else
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Called by the ppp system when it has a packet to send to the hardware.
|
|
*/
|
|
static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ipw_network *network = ppp_channel->private;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (network->outgoing_packets_queued < ipwireless_out_queue) {
|
|
unsigned char *buf;
|
|
static unsigned char header[] = {
|
|
PPP_ALLSTATIONS, /* 0xff */
|
|
PPP_UI, /* 0x03 */
|
|
};
|
|
int ret;
|
|
|
|
network->outgoing_packets_queued++;
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
|
|
/*
|
|
* If we have the requested amount of headroom in the skb we
|
|
* were handed, then we can add the header efficiently.
|
|
*/
|
|
if (skb_headroom(skb) >= 2) {
|
|
memcpy(skb_push(skb, 2), header, 2);
|
|
ret = ipwireless_send_packet(network->hardware,
|
|
IPW_CHANNEL_RAS, skb->data,
|
|
skb->len,
|
|
notify_packet_sent,
|
|
network);
|
|
if (ret < 0) {
|
|
skb_pull(skb, 2);
|
|
return 0;
|
|
}
|
|
} else {
|
|
/* Otherwise (rarely) we do it inefficiently. */
|
|
buf = kmalloc(skb->len + 2, GFP_ATOMIC);
|
|
if (!buf)
|
|
return 0;
|
|
memcpy(buf + 2, skb->data, skb->len);
|
|
memcpy(buf, header, 2);
|
|
ret = ipwireless_send_packet(network->hardware,
|
|
IPW_CHANNEL_RAS, buf,
|
|
skb->len + 2,
|
|
notify_packet_sent,
|
|
network);
|
|
kfree(buf);
|
|
if (ret < 0)
|
|
return 0;
|
|
}
|
|
kfree_skb(skb);
|
|
return 1;
|
|
} else {
|
|
/*
|
|
* Otherwise reject the packet, and flag that the ppp system
|
|
* needs to be unblocked once we are ready to send.
|
|
*/
|
|
network->ppp_blocked = 1;
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
if (ipwireless_debug)
|
|
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
|
|
static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct ipw_network *network = ppp_channel->private;
|
|
int err, val;
|
|
u32 accm[8];
|
|
int __user *user_arg = (int __user *) arg;
|
|
|
|
err = -EFAULT;
|
|
switch (cmd) {
|
|
case PPPIOCGFLAGS:
|
|
val = network->flags | network->rbits;
|
|
if (put_user(val, user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCSFLAGS:
|
|
if (get_user(val, user_arg))
|
|
break;
|
|
network->flags = val & ~SC_RCV_BITS;
|
|
network->rbits = val & SC_RCV_BITS;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCGASYNCMAP:
|
|
if (put_user(network->xaccm[0], user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCSASYNCMAP:
|
|
if (get_user(network->xaccm[0], user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCGRASYNCMAP:
|
|
if (put_user(network->raccm, user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCSRASYNCMAP:
|
|
if (get_user(network->raccm, user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCGXASYNCMAP:
|
|
if (copy_to_user((void __user *) arg, network->xaccm,
|
|
sizeof(network->xaccm)))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCSXASYNCMAP:
|
|
if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
|
|
break;
|
|
accm[2] &= ~0x40000000U; /* can't escape 0x5e */
|
|
accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
|
|
memcpy(network->xaccm, accm, sizeof(network->xaccm));
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCGMRU:
|
|
if (put_user(network->mru, user_arg))
|
|
break;
|
|
err = 0;
|
|
break;
|
|
|
|
case PPPIOCSMRU:
|
|
if (get_user(val, user_arg))
|
|
break;
|
|
if (val < PPP_MRU)
|
|
val = PPP_MRU;
|
|
network->mru = val;
|
|
err = 0;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOTTY;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
|
|
.start_xmit = ipwireless_ppp_start_xmit,
|
|
.ioctl = ipwireless_ppp_ioctl
|
|
};
|
|
|
|
static void do_go_online(struct work_struct *work_go_online)
|
|
{
|
|
struct ipw_network *network =
|
|
container_of(work_go_online, struct ipw_network,
|
|
work_go_online);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (!network->ppp_channel) {
|
|
struct ppp_channel *channel;
|
|
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
|
|
if (!channel) {
|
|
printk(KERN_ERR IPWIRELESS_PCCARD_NAME
|
|
": unable to allocate PPP channel\n");
|
|
return;
|
|
}
|
|
channel->private = network;
|
|
channel->mtu = 16384; /* Wild guess */
|
|
channel->hdrlen = 2;
|
|
channel->ops = &ipwireless_ppp_channel_ops;
|
|
|
|
network->flags = 0;
|
|
network->rbits = 0;
|
|
network->mru = PPP_MRU;
|
|
memset(network->xaccm, 0, sizeof(network->xaccm));
|
|
network->xaccm[0] = ~0U;
|
|
network->xaccm[3] = 0x60000000U;
|
|
network->raccm = ~0U;
|
|
if (ppp_register_channel(channel) < 0) {
|
|
printk(KERN_ERR IPWIRELESS_PCCARD_NAME
|
|
": unable to register PPP channel\n");
|
|
kfree(channel);
|
|
return;
|
|
}
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
network->ppp_channel = channel;
|
|
}
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
}
|
|
|
|
static void do_go_offline(struct work_struct *work_go_offline)
|
|
{
|
|
struct ipw_network *network =
|
|
container_of(work_go_offline, struct ipw_network,
|
|
work_go_offline);
|
|
unsigned long flags;
|
|
|
|
mutex_lock(&network->close_lock);
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (network->ppp_channel != NULL) {
|
|
struct ppp_channel *channel = network->ppp_channel;
|
|
|
|
network->ppp_channel = NULL;
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
mutex_unlock(&network->close_lock);
|
|
ppp_unregister_channel(channel);
|
|
} else {
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
mutex_unlock(&network->close_lock);
|
|
}
|
|
}
|
|
|
|
void ipwireless_network_notify_control_line_change(struct ipw_network *network,
|
|
unsigned int channel_idx,
|
|
unsigned int control_lines,
|
|
unsigned int changed_mask)
|
|
{
|
|
int i;
|
|
|
|
if (channel_idx == IPW_CHANNEL_RAS)
|
|
network->ras_control_lines = control_lines;
|
|
|
|
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
|
|
struct ipw_tty *tty =
|
|
network->associated_ttys[channel_idx][i];
|
|
|
|
/*
|
|
* If it's associated with a tty (other than the RAS channel
|
|
* when we're online), then send the data to that tty. The RAS
|
|
* channel's data is handled above - it always goes through
|
|
* ppp_generic.
|
|
*/
|
|
if (tty)
|
|
ipwireless_tty_notify_control_line_change(tty,
|
|
channel_idx,
|
|
control_lines,
|
|
changed_mask);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
|
|
* bytes, which are required on sent packet, but not always present on received
|
|
* packets
|
|
*/
|
|
static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
|
|
unsigned int length)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
|
|
length -= 2;
|
|
data += 2;
|
|
}
|
|
|
|
skb = dev_alloc_skb(length + 4);
|
|
if (skb == NULL)
|
|
return NULL;
|
|
skb_reserve(skb, 2);
|
|
skb_put_data(skb, data, length);
|
|
|
|
return skb;
|
|
}
|
|
|
|
void ipwireless_network_packet_received(struct ipw_network *network,
|
|
unsigned int channel_idx,
|
|
unsigned char *data,
|
|
unsigned int length)
|
|
{
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
|
|
struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
|
|
|
|
if (!tty)
|
|
continue;
|
|
|
|
/*
|
|
* If it's associated with a tty (other than the RAS channel
|
|
* when we're online), then send the data to that tty. The RAS
|
|
* channel's data is handled above - it always goes through
|
|
* ppp_generic.
|
|
*/
|
|
if (channel_idx == IPW_CHANNEL_RAS
|
|
&& (network->ras_control_lines &
|
|
IPW_CONTROL_LINE_DCD) != 0
|
|
&& ipwireless_tty_is_modem(tty)) {
|
|
/*
|
|
* If data came in on the RAS channel and this tty is
|
|
* the modem tty, and we are online, then we send it to
|
|
* the PPP layer.
|
|
*/
|
|
mutex_lock(&network->close_lock);
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (network->ppp_channel != NULL) {
|
|
struct sk_buff *skb;
|
|
|
|
spin_unlock_irqrestore(&network->lock,
|
|
flags);
|
|
|
|
/* Send the data to the ppp_generic module. */
|
|
skb = ipw_packet_received_skb(data, length);
|
|
if (skb)
|
|
ppp_input(network->ppp_channel, skb);
|
|
} else
|
|
spin_unlock_irqrestore(&network->lock,
|
|
flags);
|
|
mutex_unlock(&network->close_lock);
|
|
}
|
|
/* Otherwise we send it out the tty. */
|
|
else
|
|
ipwireless_tty_received(tty, data, length);
|
|
}
|
|
}
|
|
|
|
struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
|
|
{
|
|
struct ipw_network *network =
|
|
kzalloc(sizeof(struct ipw_network), GFP_KERNEL);
|
|
|
|
if (!network)
|
|
return NULL;
|
|
|
|
spin_lock_init(&network->lock);
|
|
mutex_init(&network->close_lock);
|
|
|
|
network->hardware = hw;
|
|
|
|
INIT_WORK(&network->work_go_online, do_go_online);
|
|
INIT_WORK(&network->work_go_offline, do_go_offline);
|
|
|
|
ipwireless_associate_network(hw, network);
|
|
|
|
return network;
|
|
}
|
|
|
|
void ipwireless_network_free(struct ipw_network *network)
|
|
{
|
|
network->shutting_down = 1;
|
|
|
|
ipwireless_ppp_close(network);
|
|
flush_work(&network->work_go_online);
|
|
flush_work(&network->work_go_offline);
|
|
|
|
ipwireless_stop_interrupts(network->hardware);
|
|
ipwireless_associate_network(network->hardware, NULL);
|
|
|
|
kfree(network);
|
|
}
|
|
|
|
void ipwireless_associate_network_tty(struct ipw_network *network,
|
|
unsigned int channel_idx,
|
|
struct ipw_tty *tty)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
|
|
if (network->associated_ttys[channel_idx][i] == NULL) {
|
|
network->associated_ttys[channel_idx][i] = tty;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ipwireless_disassociate_network_ttys(struct ipw_network *network,
|
|
unsigned int channel_idx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
|
|
network->associated_ttys[channel_idx][i] = NULL;
|
|
}
|
|
|
|
void ipwireless_ppp_open(struct ipw_network *network)
|
|
{
|
|
if (ipwireless_debug)
|
|
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
|
|
schedule_work(&network->work_go_online);
|
|
}
|
|
|
|
void ipwireless_ppp_close(struct ipw_network *network)
|
|
{
|
|
/* Disconnect from the wireless network. */
|
|
if (ipwireless_debug)
|
|
printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
|
|
schedule_work(&network->work_go_offline);
|
|
}
|
|
|
|
int ipwireless_ppp_channel_index(struct ipw_network *network)
|
|
{
|
|
int ret = -1;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (network->ppp_channel != NULL)
|
|
ret = ppp_channel_index(network->ppp_channel);
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ipwireless_ppp_unit_number(struct ipw_network *network)
|
|
{
|
|
int ret = -1;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&network->lock, flags);
|
|
if (network->ppp_channel != NULL)
|
|
ret = ppp_unit_number(network->ppp_channel);
|
|
spin_unlock_irqrestore(&network->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ipwireless_ppp_mru(const struct ipw_network *network)
|
|
{
|
|
return network->mru;
|
|
}
|