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linux/net/irda/irlan/irlan_common.c
Arjan van de Ven da7071d7e3 [PATCH] mark struct file_operations const 8 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

1244 lines
31 KiB
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/*********************************************************************
*
* Filename: irlan_common.c
* Version: 0.9
* Description: IrDA LAN Access Protocol Implementation
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Aug 31 20:14:37 1997
* Modified at: Sun Dec 26 21:53:10 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1997, 1999 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
********************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/random.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/moduleparam.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <net/irda/irda.h>
#include <net/irda/irttp.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/timer.h>
#include <net/irda/irlan_common.h>
#include <net/irda/irlan_client.h>
#include <net/irda/irlan_provider.h>
#include <net/irda/irlan_eth.h>
#include <net/irda/irlan_filter.h>
/*
* Send gratuitous ARP when connected to a new AP or not. May be a clever
* thing to do, but for some reason the machine crashes if you use DHCP. So
* lets not use it by default.
*/
#undef CONFIG_IRLAN_SEND_GRATUITOUS_ARP
/* extern char sysctl_devname[]; */
/*
* Master structure
*/
static LIST_HEAD(irlans);
static void *ckey;
static void *skey;
/* Module parameters */
static int eth; /* Use "eth" or "irlan" name for devices */
static int access = ACCESS_PEER; /* PEER, DIRECT or HOSTED */
#ifdef CONFIG_PROC_FS
static const char *irlan_access[] = {
"UNKNOWN",
"DIRECT",
"PEER",
"HOSTED"
};
static const char *irlan_media[] = {
"UNKNOWN",
"802.3",
"802.5"
};
extern struct proc_dir_entry *proc_irda;
static int irlan_seq_open(struct inode *inode, struct file *file);
static const struct file_operations irlan_fops = {
.owner = THIS_MODULE,
.open = irlan_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
extern struct proc_dir_entry *proc_irda;
#endif /* CONFIG_PROC_FS */
static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr);
static void __irlan_close(struct irlan_cb *self);
static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
__u8 value_byte, __u16 value_short,
__u8 *value_array, __u16 value_len);
static void irlan_open_unicast_addr(struct irlan_cb *self);
static void irlan_get_unicast_addr(struct irlan_cb *self);
void irlan_close_tsaps(struct irlan_cb *self);
/*
* Function irlan_init (void)
*
* Initialize IrLAN layer
*
*/
static int __init irlan_init(void)
{
struct irlan_cb *new;
__u16 hints;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
#ifdef CONFIG_PROC_FS
{ struct proc_dir_entry *proc;
proc = create_proc_entry("irlan", 0, proc_irda);
if (!proc) {
printk(KERN_ERR "irlan_init: can't create /proc entry!\n");
return -ENODEV;
}
proc->proc_fops = &irlan_fops;
}
#endif /* CONFIG_PROC_FS */
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
hints = irlmp_service_to_hint(S_LAN);
/* Register with IrLMP as a client */
ckey = irlmp_register_client(hints, &irlan_client_discovery_indication,
NULL, NULL);
if (!ckey)
goto err_ckey;
/* Register with IrLMP as a service */
skey = irlmp_register_service(hints);
if (!skey)
goto err_skey;
/* Start the master IrLAN instance (the only one for now) */
new = irlan_open(DEV_ADDR_ANY, DEV_ADDR_ANY);
if (!new)
goto err_open;
/* The master will only open its (listen) control TSAP */
irlan_provider_open_ctrl_tsap(new);
/* Do some fast discovery! */
irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
return 0;
err_open:
irlmp_unregister_service(skey);
err_skey:
irlmp_unregister_client(ckey);
err_ckey:
#ifdef CONFIG_PROC_FS
remove_proc_entry("irlan", proc_irda);
#endif /* CONFIG_PROC_FS */
return -ENOMEM;
}
static void __exit irlan_cleanup(void)
{
struct irlan_cb *self, *next;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
irlmp_unregister_client(ckey);
irlmp_unregister_service(skey);
#ifdef CONFIG_PROC_FS
remove_proc_entry("irlan", proc_irda);
#endif /* CONFIG_PROC_FS */
/* Cleanup any leftover network devices */
rtnl_lock();
list_for_each_entry_safe(self, next, &irlans, dev_list) {
__irlan_close(self);
}
rtnl_unlock();
}
/*
* Function irlan_open (void)
*
* Open new instance of a client/provider, we should only register the
* network device if this instance is ment for a particular client/provider
*/
static struct irlan_cb *irlan_open(__u32 saddr, __u32 daddr)
{
struct net_device *dev;
struct irlan_cb *self;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
/* Create network device with irlan */
dev = alloc_irlandev(eth ? "eth%d" : "irlan%d");
if (!dev)
return NULL;
self = dev->priv;
self->dev = dev;
/*
* Initialize local device structure
*/
self->magic = IRLAN_MAGIC;
self->saddr = saddr;
self->daddr = daddr;
/* Provider access can only be PEER, DIRECT, or HOSTED */
self->provider.access_type = access;
if (access == ACCESS_DIRECT) {
/*
* Since we are emulating an IrLAN sever we will have to
* give ourself an ethernet address!
*/
dev->dev_addr[0] = 0x40;
dev->dev_addr[1] = 0x00;
dev->dev_addr[2] = 0x00;
dev->dev_addr[3] = 0x00;
get_random_bytes(dev->dev_addr+4, 1);
get_random_bytes(dev->dev_addr+5, 1);
}
self->media = MEDIA_802_3;
self->disconnect_reason = LM_USER_REQUEST;
init_timer(&self->watchdog_timer);
init_timer(&self->client.kick_timer);
init_waitqueue_head(&self->open_wait);
skb_queue_head_init(&self->client.txq);
irlan_next_client_state(self, IRLAN_IDLE);
irlan_next_provider_state(self, IRLAN_IDLE);
if (register_netdev(dev)) {
IRDA_DEBUG(2, "%s(), register_netdev() failed!\n",
__FUNCTION__ );
self = NULL;
free_netdev(dev);
} else {
rtnl_lock();
list_add_rcu(&self->dev_list, &irlans);
rtnl_unlock();
}
return self;
}
/*
* Function __irlan_close (self)
*
* This function closes and deallocates the IrLAN client instances. Be
* aware that other functions which calls client_close() must
* remove self from irlans list first.
*/
static void __irlan_close(struct irlan_cb *self)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
ASSERT_RTNL();
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
del_timer_sync(&self->watchdog_timer);
del_timer_sync(&self->client.kick_timer);
/* Close all open connections and remove TSAPs */
irlan_close_tsaps(self);
if (self->client.iriap)
iriap_close(self->client.iriap);
/* Remove frames queued on the control channel */
skb_queue_purge(&self->client.txq);
/* Unregister and free self via destructor */
unregister_netdevice(self->dev);
}
/* Find any instance of irlan, used for client discovery wakeup */
struct irlan_cb *irlan_get_any(void)
{
struct irlan_cb *self;
list_for_each_entry_rcu(self, &irlans, dev_list) {
return self;
}
return NULL;
}
/*
* Function irlan_connect_indication (instance, sap, qos, max_sdu_size, skb)
*
* Here we receive the connect indication for the data channel
*
*/
static void irlan_connect_indication(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct irlan_cb *self;
struct tsap_cb *tsap;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
self = (struct irlan_cb *) instance;
tsap = (struct tsap_cb *) sap;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
IRDA_ASSERT(tsap == self->tsap_data,return;);
self->max_sdu_size = max_sdu_size;
self->max_header_size = max_header_size;
IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);
del_timer(&self->watchdog_timer);
/* If you want to pass the skb to *both* state machines, you will
* need to skb_clone() it, so that you don't free it twice.
* As the state machines don't need it, git rid of it here...
* Jean II */
if (skb)
dev_kfree_skb(skb);
irlan_do_provider_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
irlan_do_client_event(self, IRLAN_DATA_CONNECT_INDICATION, NULL);
if (self->provider.access_type == ACCESS_PEER) {
/*
* Data channel is open, so we are now allowed to
* configure the remote filter
*/
irlan_get_unicast_addr(self);
irlan_open_unicast_addr(self);
}
/* Ready to transfer Ethernet frames (at last) */
netif_start_queue(self->dev); /* Clear reason */
}
static void irlan_connect_confirm(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct irlan_cb *self;
self = (struct irlan_cb *) instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
self->max_sdu_size = max_sdu_size;
self->max_header_size = max_header_size;
/* TODO: we could set the MTU depending on the max_sdu_size */
IRDA_DEBUG(0, "%s: We are now connected!\n", __FUNCTION__);
del_timer(&self->watchdog_timer);
/*
* Data channel is open, so we are now allowed to configure the remote
* filter
*/
irlan_get_unicast_addr(self);
irlan_open_unicast_addr(self);
/* Open broadcast and multicast filter by default */
irlan_set_broadcast_filter(self, TRUE);
irlan_set_multicast_filter(self, TRUE);
/* Ready to transfer Ethernet frames */
netif_start_queue(self->dev);
self->disconnect_reason = 0; /* Clear reason */
#ifdef CONFIG_IRLAN_SEND_GRATUITOUS_ARP
irlan_eth_send_gratuitous_arp(&self->dev);
#endif
wake_up_interruptible(&self->open_wait);
}
/*
* Function irlan_client_disconnect_indication (handle)
*
* Callback function for the IrTTP layer. Indicates a disconnection of
* the specified connection (handle)
*/
static void irlan_disconnect_indication(void *instance,
void *sap, LM_REASON reason,
struct sk_buff *userdata)
{
struct irlan_cb *self;
struct tsap_cb *tsap;
IRDA_DEBUG(0, "%s(), reason=%d\n", __FUNCTION__ , reason);
self = (struct irlan_cb *) instance;
tsap = (struct tsap_cb *) sap;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
IRDA_ASSERT(tsap != NULL, return;);
IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
IRDA_ASSERT(tsap == self->tsap_data, return;);
IRDA_DEBUG(2, "IrLAN, data channel disconnected by peer!\n");
/* Save reason so we know if we should try to reconnect or not */
self->disconnect_reason = reason;
switch (reason) {
case LM_USER_REQUEST: /* User request */
IRDA_DEBUG(2, "%s(), User requested\n", __FUNCTION__ );
break;
case LM_LAP_DISCONNECT: /* Unexpected IrLAP disconnect */
IRDA_DEBUG(2, "%s(), Unexpected IrLAP disconnect\n", __FUNCTION__ );
break;
case LM_CONNECT_FAILURE: /* Failed to establish IrLAP connection */
IRDA_DEBUG(2, "%s(), IrLAP connect failed\n", __FUNCTION__ );
break;
case LM_LAP_RESET: /* IrLAP reset */
IRDA_DEBUG(2, "%s(), IrLAP reset\n", __FUNCTION__ );
break;
case LM_INIT_DISCONNECT:
IRDA_DEBUG(2, "%s(), IrLMP connect failed\n", __FUNCTION__ );
break;
default:
IRDA_ERROR("%s(), Unknown disconnect reason\n", __FUNCTION__);
break;
}
/* If you want to pass the skb to *both* state machines, you will
* need to skb_clone() it, so that you don't free it twice.
* As the state machines don't need it, git rid of it here...
* Jean II */
if (userdata)
dev_kfree_skb(userdata);
irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
wake_up_interruptible(&self->open_wait);
}
void irlan_open_data_tsap(struct irlan_cb *self)
{
struct tsap_cb *tsap;
notify_t notify;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* Check if already open */
if (self->tsap_data)
return;
irda_notify_init(&notify);
notify.data_indication = irlan_eth_receive;
notify.udata_indication = irlan_eth_receive;
notify.connect_indication = irlan_connect_indication;
notify.connect_confirm = irlan_connect_confirm;
notify.flow_indication = irlan_eth_flow_indication;
notify.disconnect_indication = irlan_disconnect_indication;
notify.instance = self;
strlcpy(notify.name, "IrLAN data", sizeof(notify.name));
tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, &notify);
if (!tsap) {
IRDA_DEBUG(2, "%s(), Got no tsap!\n", __FUNCTION__ );
return;
}
self->tsap_data = tsap;
/*
* This is the data TSAP selector which we will pass to the client
* when the client ask for it.
*/
self->stsap_sel_data = self->tsap_data->stsap_sel;
}
void irlan_close_tsaps(struct irlan_cb *self)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* Disconnect and close all open TSAP connections */
if (self->tsap_data) {
irttp_disconnect_request(self->tsap_data, NULL, P_NORMAL);
irttp_close_tsap(self->tsap_data);
self->tsap_data = NULL;
}
if (self->client.tsap_ctrl) {
irttp_disconnect_request(self->client.tsap_ctrl, NULL,
P_NORMAL);
irttp_close_tsap(self->client.tsap_ctrl);
self->client.tsap_ctrl = NULL;
}
if (self->provider.tsap_ctrl) {
irttp_disconnect_request(self->provider.tsap_ctrl, NULL,
P_NORMAL);
irttp_close_tsap(self->provider.tsap_ctrl);
self->provider.tsap_ctrl = NULL;
}
self->disconnect_reason = LM_USER_REQUEST;
}
/*
* Function irlan_ias_register (self, tsap_sel)
*
* Register with LM-IAS
*
*/
void irlan_ias_register(struct irlan_cb *self, __u8 tsap_sel)
{
struct ias_object *obj;
struct ias_value *new_value;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/*
* Check if object has already been registered by a previous provider.
* If that is the case, we just change the value of the attribute
*/
if (!irias_find_object("IrLAN")) {
obj = irias_new_object("IrLAN", IAS_IRLAN_ID);
irias_add_integer_attrib(obj, "IrDA:TinyTP:LsapSel", tsap_sel,
IAS_KERNEL_ATTR);
irias_insert_object(obj);
} else {
new_value = irias_new_integer_value(tsap_sel);
irias_object_change_attribute("IrLAN", "IrDA:TinyTP:LsapSel",
new_value);
}
/* Register PnP object only if not registered before */
if (!irias_find_object("PnP")) {
obj = irias_new_object("PnP", IAS_PNP_ID);
#if 0
irias_add_string_attrib(obj, "Name", sysctl_devname,
IAS_KERNEL_ATTR);
#else
irias_add_string_attrib(obj, "Name", "Linux", IAS_KERNEL_ATTR);
#endif
irias_add_string_attrib(obj, "DeviceID", "HWP19F0",
IAS_KERNEL_ATTR);
irias_add_integer_attrib(obj, "CompCnt", 1, IAS_KERNEL_ATTR);
if (self->provider.access_type == ACCESS_PEER)
irias_add_string_attrib(obj, "Comp#01", "PNP8389",
IAS_KERNEL_ATTR);
else
irias_add_string_attrib(obj, "Comp#01", "PNP8294",
IAS_KERNEL_ATTR);
irias_add_string_attrib(obj, "Manufacturer",
"Linux-IrDA Project", IAS_KERNEL_ATTR);
irias_insert_object(obj);
}
}
/*
* Function irlan_run_ctrl_tx_queue (self)
*
* Try to send the next command in the control transmit queue
*
*/
int irlan_run_ctrl_tx_queue(struct irlan_cb *self)
{
struct sk_buff *skb;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
if (irda_lock(&self->client.tx_busy) == FALSE)
return -EBUSY;
skb = skb_dequeue(&self->client.txq);
if (!skb) {
self->client.tx_busy = FALSE;
return 0;
}
/* Check that it's really possible to send commands */
if ((self->client.tsap_ctrl == NULL) ||
(self->client.state == IRLAN_IDLE))
{
self->client.tx_busy = FALSE;
dev_kfree_skb(skb);
return -1;
}
IRDA_DEBUG(2, "%s(), sending ...\n", __FUNCTION__ );
return irttp_data_request(self->client.tsap_ctrl, skb);
}
/*
* Function irlan_ctrl_data_request (self, skb)
*
* This function makes sure that commands on the control channel is being
* sent in a command/response fashion
*/
static void irlan_ctrl_data_request(struct irlan_cb *self, struct sk_buff *skb)
{
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
/* Queue command */
skb_queue_tail(&self->client.txq, skb);
/* Try to send command */
irlan_run_ctrl_tx_queue(self);
}
/*
* Function irlan_get_provider_info (self)
*
* Send Get Provider Information command to peer IrLAN layer
*
*/
void irlan_get_provider_info(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER,
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
frame[0] = CMD_GET_PROVIDER_INFO;
frame[1] = 0x00; /* Zero parameters */
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_open_data_channel (self)
*
* Send an Open Data Command to provider
*
*/
void irlan_open_data_channel(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3") +
IRLAN_STRING_PARAMETER_LEN("ACCESS_TYPE", "DIRECT"),
GFP_ATOMIC);
if (!skb)
return;
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
/* Build frame */
frame[0] = CMD_OPEN_DATA_CHANNEL;
frame[1] = 0x02; /* Two parameters */
irlan_insert_string_param(skb, "MEDIA", "802.3");
irlan_insert_string_param(skb, "ACCESS_TYPE", "DIRECT");
/* irlan_insert_string_param(skb, "MODE", "UNRELIABLE"); */
/* self->use_udata = TRUE; */
irlan_ctrl_data_request(self, skb);
}
void irlan_close_data_channel(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* Check if the TSAP is still there */
if (self->client.tsap_ctrl == NULL)
return;
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN"),
GFP_ATOMIC);
if (!skb)
return;
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
/* Build frame */
frame[0] = CMD_CLOSE_DATA_CHAN;
frame[1] = 0x01; /* One parameter */
irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_open_unicast_addr (self)
*
* Make IrLAN provider accept ethernet frames addressed to the unicast
* address.
*
*/
static void irlan_open_unicast_addr(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->max_header_size);
skb_put(skb, 2);
frame = skb->data;
frame[0] = CMD_FILTER_OPERATION;
frame[1] = 0x03; /* Three parameters */
irlan_insert_byte_param(skb, "DATA_CHAN" , self->dtsap_sel_data);
irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_set_broadcast_filter (self, status)
*
* Make IrLAN provider accept ethernet frames addressed to the broadcast
* address. Be careful with the use of this one, since there may be a lot
* of broadcast traffic out there. We can still function without this
* one but then _we_ have to initiate all communication with other
* hosts, since ARP request for this host will not be answered.
*/
void irlan_set_broadcast_filter(struct irlan_cb *self, int status)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "BROADCAST") +
/* We may waste one byte here...*/
IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "FILTER"),
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
frame[0] = CMD_FILTER_OPERATION;
frame[1] = 0x03; /* Three parameters */
irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
irlan_insert_string_param(skb, "FILTER_TYPE", "BROADCAST");
if (status)
irlan_insert_string_param(skb, "FILTER_MODE", "FILTER");
else
irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_set_multicast_filter (self, status)
*
* Make IrLAN provider accept ethernet frames addressed to the multicast
* address.
*
*/
void irlan_set_multicast_filter(struct irlan_cb *self, int status)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "MULTICAST") +
/* We may waste one byte here...*/
IRLAN_STRING_PARAMETER_LEN("FILTER_MODE", "NONE"),
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
frame[0] = CMD_FILTER_OPERATION;
frame[1] = 0x03; /* Three parameters */
irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
irlan_insert_string_param(skb, "FILTER_TYPE", "MULTICAST");
if (status)
irlan_insert_string_param(skb, "FILTER_MODE", "ALL");
else
irlan_insert_string_param(skb, "FILTER_MODE", "NONE");
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_get_unicast_addr (self)
*
* Retrieves the unicast address from the IrLAN provider. This address
* will be inserted into the devices structure, so the ethernet layer
* can construct its packets.
*
*/
static void irlan_get_unicast_addr(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_BYTE_PARAMETER_LEN("DATA_CHAN") +
IRLAN_STRING_PARAMETER_LEN("FILTER_TYPE", "DIRECTED") +
IRLAN_STRING_PARAMETER_LEN("FILTER_OPERATION",
"DYNAMIC"),
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
frame[0] = CMD_FILTER_OPERATION;
frame[1] = 0x03; /* Three parameters */
irlan_insert_byte_param(skb, "DATA_CHAN", self->dtsap_sel_data);
irlan_insert_string_param(skb, "FILTER_TYPE", "DIRECTED");
irlan_insert_string_param(skb, "FILTER_OPERATION", "DYNAMIC");
irlan_ctrl_data_request(self, skb);
}
/*
* Function irlan_get_media_char (self)
*
*
*
*/
void irlan_get_media_char(struct irlan_cb *self)
{
struct sk_buff *skb;
__u8 *frame;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
skb = alloc_skb(IRLAN_MAX_HEADER + IRLAN_CMD_HEADER +
IRLAN_STRING_PARAMETER_LEN("MEDIA", "802.3"),
GFP_ATOMIC);
if (!skb)
return;
/* Reserve space for TTP, LMP, and LAP header */
skb_reserve(skb, self->client.max_header_size);
skb_put(skb, 2);
frame = skb->data;
/* Build frame */
frame[0] = CMD_GET_MEDIA_CHAR;
frame[1] = 0x01; /* One parameter */
irlan_insert_string_param(skb, "MEDIA", "802.3");
irlan_ctrl_data_request(self, skb);
}
/*
* Function insert_byte_param (skb, param, value)
*
* Insert byte parameter into frame
*
*/
int irlan_insert_byte_param(struct sk_buff *skb, char *param, __u8 value)
{
return __irlan_insert_param(skb, param, IRLAN_BYTE, value, 0, NULL, 0);
}
int irlan_insert_short_param(struct sk_buff *skb, char *param, __u16 value)
{
return __irlan_insert_param(skb, param, IRLAN_SHORT, 0, value, NULL, 0);
}
/*
* Function insert_string (skb, param, value)
*
* Insert string parameter into frame
*
*/
int irlan_insert_string_param(struct sk_buff *skb, char *param, char *string)
{
int string_len = strlen(string);
return __irlan_insert_param(skb, param, IRLAN_ARRAY, 0, 0, string,
string_len);
}
/*
* Function insert_array_param(skb, param, value, len_value)
*
* Insert array parameter into frame
*
*/
int irlan_insert_array_param(struct sk_buff *skb, char *name, __u8 *array,
__u16 array_len)
{
return __irlan_insert_param(skb, name, IRLAN_ARRAY, 0, 0, array,
array_len);
}
/*
* Function insert_param (skb, param, value, byte)
*
* Insert parameter at end of buffer, structure of a parameter is:
*
* -----------------------------------------------------------------------
* | Name Length[1] | Param Name[1..255] | Val Length[2] | Value[0..1016]|
* -----------------------------------------------------------------------
*/
static int __irlan_insert_param(struct sk_buff *skb, char *param, int type,
__u8 value_byte, __u16 value_short,
__u8 *value_array, __u16 value_len)
{
__u8 *frame;
__u8 param_len;
__le16 tmp_le; /* Temporary value in little endian format */
int n=0;
if (skb == NULL) {
IRDA_DEBUG(2, "%s(), Got NULL skb\n", __FUNCTION__ );
return 0;
}
param_len = strlen(param);
switch (type) {
case IRLAN_BYTE:
value_len = 1;
break;
case IRLAN_SHORT:
value_len = 2;
break;
case IRLAN_ARRAY:
IRDA_ASSERT(value_array != NULL, return 0;);
IRDA_ASSERT(value_len > 0, return 0;);
break;
default:
IRDA_DEBUG(2, "%s(), Unknown parameter type!\n", __FUNCTION__ );
return 0;
break;
}
/* Insert at end of sk-buffer */
frame = skb->tail;
/* Make space for data */
if (skb_tailroom(skb) < (param_len+value_len+3)) {
IRDA_DEBUG(2, "%s(), No more space at end of skb\n", __FUNCTION__ );
return 0;
}
skb_put(skb, param_len+value_len+3);
/* Insert parameter length */
frame[n++] = param_len;
/* Insert parameter */
memcpy(frame+n, param, param_len); n += param_len;
/* Insert value length (2 byte little endian format, LSB first) */
tmp_le = cpu_to_le16(value_len);
memcpy(frame+n, &tmp_le, 2); n += 2; /* To avoid alignment problems */
/* Insert value */
switch (type) {
case IRLAN_BYTE:
frame[n++] = value_byte;
break;
case IRLAN_SHORT:
tmp_le = cpu_to_le16(value_short);
memcpy(frame+n, &tmp_le, 2); n += 2;
break;
case IRLAN_ARRAY:
memcpy(frame+n, value_array, value_len); n+=value_len;
break;
default:
break;
}
IRDA_ASSERT(n == (param_len+value_len+3), return 0;);
return param_len+value_len+3;
}
/*
* Function irlan_extract_param (buf, name, value, len)
*
* Extracts a single parameter name/value pair from buffer and updates
* the buffer pointer to point to the next name/value pair.
*/
int irlan_extract_param(__u8 *buf, char *name, char *value, __u16 *len)
{
__u8 name_len;
__u16 val_len;
int n=0;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
/* get length of parameter name (1 byte) */
name_len = buf[n++];
if (name_len > 254) {
IRDA_DEBUG(2, "%s(), name_len > 254\n", __FUNCTION__ );
return -RSP_INVALID_COMMAND_FORMAT;
}
/* get parameter name */
memcpy(name, buf+n, name_len);
name[name_len] = '\0';
n+=name_len;
/*
* Get length of parameter value (2 bytes in little endian
* format)
*/
memcpy(&val_len, buf+n, 2); /* To avoid alignment problems */
le16_to_cpus(&val_len); n+=2;
if (val_len > 1016) {
IRDA_DEBUG(2, "%s(), parameter length to long\n", __FUNCTION__ );
return -RSP_INVALID_COMMAND_FORMAT;
}
*len = val_len;
/* get parameter value */
memcpy(value, buf+n, val_len);
value[val_len] = '\0';
n+=val_len;
IRDA_DEBUG(4, "Parameter: %s ", name);
IRDA_DEBUG(4, "Value: %s\n", value);
return n;
}
#ifdef CONFIG_PROC_FS
/*
* Start of reading /proc entries.
* Return entry at pos,
* or start_token to indicate print header line
* or NULL if end of file
*/
static void *irlan_seq_start(struct seq_file *seq, loff_t *pos)
{
int i = 1;
struct irlan_cb *self;
rcu_read_lock();
if (*pos == 0)
return SEQ_START_TOKEN;
list_for_each_entry(self, &irlans, dev_list) {
if (*pos == i)
return self;
++i;
}
return NULL;
}
/* Return entry after v, and increment pos */
static void *irlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct list_head *nxt;
++*pos;
if (v == SEQ_START_TOKEN)
nxt = irlans.next;
else
nxt = ((struct irlan_cb *)v)->dev_list.next;
return (nxt == &irlans) ? NULL
: list_entry(nxt, struct irlan_cb, dev_list);
}
/* End of reading /proc file */
static void irlan_seq_stop(struct seq_file *seq, void *v)
{
rcu_read_unlock();
}
/*
* Show one entry in /proc file.
*/
static int irlan_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN)
seq_puts(seq, "IrLAN instances:\n");
else {
struct irlan_cb *self = v;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
seq_printf(seq,"ifname: %s,\n",
self->dev->name);
seq_printf(seq,"client state: %s, ",
irlan_state[ self->client.state]);
seq_printf(seq,"provider state: %s,\n",
irlan_state[ self->provider.state]);
seq_printf(seq,"saddr: %#08x, ",
self->saddr);
seq_printf(seq,"daddr: %#08x\n",
self->daddr);
seq_printf(seq,"version: %d.%d,\n",
self->version[1], self->version[0]);
seq_printf(seq,"access type: %s\n",
irlan_access[self->client.access_type]);
seq_printf(seq,"media: %s\n",
irlan_media[self->media]);
seq_printf(seq,"local filter:\n");
seq_printf(seq,"remote filter: ");
irlan_print_filter(seq, self->client.filter_type);
seq_printf(seq,"tx busy: %s\n",
netif_queue_stopped(self->dev) ? "TRUE" : "FALSE");
seq_putc(seq,'\n');
}
return 0;
}
static struct seq_operations irlan_seq_ops = {
.start = irlan_seq_start,
.next = irlan_seq_next,
.stop = irlan_seq_stop,
.show = irlan_seq_show,
};
static int irlan_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &irlan_seq_ops);
}
#endif
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("The Linux IrDA LAN protocol");
MODULE_LICENSE("GPL");
module_param(eth, bool, 0);
MODULE_PARM_DESC(eth, "Name devices ethX (0) or irlanX (1)");
module_param(access, int, 0);
MODULE_PARM_DESC(access, "Access type DIRECT=1, PEER=2, HOSTED=3");
module_init(irlan_init);
module_exit(irlan_cleanup);
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