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linux/net/irda/irlan/irlan_client.c
Josh Triplett 1bc1731133 [IrDA]: Fix RCU lock pairing on error path 
irlan_client_discovery_indication calls rcu_read_lock and rcu_read_unlock, but
returns without unlocking in an error case.  Fix that by replacing the return
with a goto so that the rcu_read_unlock always gets executed.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Samuel Ortiz samuel@sortiz.org <>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-29 17:02:31 -07:00

578 lines
15 KiB
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/*********************************************************************
*
* Filename: irlan_client.c
* Version: 0.9
* Description: IrDA LAN Access Protocol (IrLAN) Client
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sun Aug 31 20:14:37 1997
* Modified at: Tue Dec 14 15:47:02 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
* Sources: skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
* slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*
* Copyright (c) 1998-1999 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/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/bitops.h>
#include <net/arp.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/irias_object.h>
#include <net/irda/iriap.h>
#include <net/irda/timer.h>
#include <net/irda/irlan_common.h>
#include <net/irda/irlan_event.h>
#include <net/irda/irlan_eth.h>
#include <net/irda/irlan_provider.h>
#include <net/irda/irlan_client.h>
#undef CONFIG_IRLAN_GRATUITOUS_ARP
static void irlan_client_ctrl_disconnect_indication(void *instance, void *sap,
LM_REASON reason,
struct sk_buff *);
static int irlan_client_ctrl_data_indication(void *instance, void *sap,
struct sk_buff *skb);
static void irlan_client_ctrl_connect_confirm(void *instance, void *sap,
struct qos_info *qos,
__u32 max_sdu_size,
__u8 max_header_size,
struct sk_buff *);
static void irlan_check_response_param(struct irlan_cb *self, char *param,
char *value, int val_len);
static void irlan_client_open_ctrl_tsap(struct irlan_cb *self);
static void irlan_client_kick_timer_expired(void *data)
{
struct irlan_cb *self = (struct irlan_cb *) data;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/*
* If we are in peer mode, the client may not have got the discovery
* indication it needs to make progress. If the client is still in
* IDLE state, we must kick it to, but only if the provider is not IDLE
*/
if ((self->provider.access_type == ACCESS_PEER) &&
(self->client.state == IRLAN_IDLE) &&
(self->provider.state != IRLAN_IDLE)) {
irlan_client_wakeup(self, self->saddr, self->daddr);
}
}
static void irlan_client_start_kick_timer(struct irlan_cb *self, int timeout)
{
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
irda_start_timer(&self->client.kick_timer, timeout, (void *) self,
irlan_client_kick_timer_expired);
}
/*
* Function irlan_client_wakeup (self, saddr, daddr)
*
* Wake up client
*
*/
void irlan_client_wakeup(struct irlan_cb *self, __u32 saddr, __u32 daddr)
{
IRDA_DEBUG(1, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/*
* Check if we are already awake, or if we are a provider in direct
* mode (in that case we must leave the client idle
*/
if ((self->client.state != IRLAN_IDLE) ||
(self->provider.access_type == ACCESS_DIRECT))
{
IRDA_DEBUG(0, "%s(), already awake!\n", __FUNCTION__ );
return;
}
/* Addresses may have changed! */
self->saddr = saddr;
self->daddr = daddr;
if (self->disconnect_reason == LM_USER_REQUEST) {
IRDA_DEBUG(0, "%s(), still stopped by user\n", __FUNCTION__ );
return;
}
/* Open TSAPs */
irlan_client_open_ctrl_tsap(self);
irlan_open_data_tsap(self);
irlan_do_client_event(self, IRLAN_DISCOVERY_INDICATION, NULL);
/* Start kick timer */
irlan_client_start_kick_timer(self, 2*HZ);
}
/*
* Function irlan_discovery_indication (daddr)
*
* Remote device with IrLAN server support discovered
*
*/
void irlan_client_discovery_indication(discinfo_t *discovery,
DISCOVERY_MODE mode,
void *priv)
{
struct irlan_cb *self;
__u32 saddr, daddr;
IRDA_DEBUG(1, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(discovery != NULL, return;);
/*
* I didn't check it, but I bet that IrLAN suffer from the same
* deficiency as IrComm and doesn't handle two instances
* simultaneously connecting to each other.
* Same workaround, drop passive discoveries.
* Jean II */
if(mode == DISCOVERY_PASSIVE)
return;
saddr = discovery->saddr;
daddr = discovery->daddr;
/* Find instance */
rcu_read_lock();
self = irlan_get_any();
if (self) {
IRDA_ASSERT(self->magic == IRLAN_MAGIC, goto out;);
IRDA_DEBUG(1, "%s(), Found instance (%08x)!\n", __FUNCTION__ ,
daddr);
irlan_client_wakeup(self, saddr, daddr);
}
IRDA_ASSERT_LABEL(out:)
rcu_read_unlock();
}
/*
* Function irlan_client_data_indication (handle, skb)
*
* This function gets the data that is received on the control channel
*
*/
static int irlan_client_ctrl_data_indication(void *instance, void *sap,
struct sk_buff *skb)
{
struct irlan_cb *self;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
self = (struct irlan_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
IRDA_ASSERT(skb != NULL, return -1;);
irlan_do_client_event(self, IRLAN_DATA_INDICATION, skb);
/* Ready for a new command */
IRDA_DEBUG(2, "%s(), clearing tx_busy\n", __FUNCTION__ );
self->client.tx_busy = FALSE;
/* Check if we have some queued commands waiting to be sent */
irlan_run_ctrl_tx_queue(self);
return 0;
}
static void irlan_client_ctrl_disconnect_indication(void *instance, void *sap,
LM_REASON reason,
struct sk_buff *userdata)
{
struct irlan_cb *self;
struct tsap_cb *tsap;
struct sk_buff *skb;
IRDA_DEBUG(4, "%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->client.tsap_ctrl, return;);
/* Remove frames queued on the control channel */
while ((skb = skb_dequeue(&self->client.txq)) != NULL) {
dev_kfree_skb(skb);
}
self->client.tx_busy = FALSE;
irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
}
/*
* Function irlan_client_open_tsaps (self)
*
* Initialize callbacks and open IrTTP TSAPs
*
*/
static void irlan_client_open_ctrl_tsap(struct irlan_cb *self)
{
struct tsap_cb *tsap;
notify_t notify;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* Check if already open */
if (self->client.tsap_ctrl)
return;
irda_notify_init(&notify);
/* Set up callbacks */
notify.data_indication = irlan_client_ctrl_data_indication;
notify.connect_confirm = irlan_client_ctrl_connect_confirm;
notify.disconnect_indication = irlan_client_ctrl_disconnect_indication;
notify.instance = self;
strlcpy(notify.name, "IrLAN ctrl (c)", 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->client.tsap_ctrl = tsap;
}
/*
* Function irlan_client_connect_confirm (handle, skb)
*
* Connection to peer IrLAN laye confirmed
*
*/
static void irlan_client_ctrl_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;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
self = (struct irlan_cb *) instance;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
self->client.max_sdu_size = max_sdu_size;
self->client.max_header_size = max_header_size;
/* TODO: we could set the MTU depending on the max_sdu_size */
irlan_do_client_event(self, IRLAN_CONNECT_COMPLETE, NULL);
}
/*
* Function print_ret_code (code)
*
* Print return code of request to peer IrLAN layer.
*
*/
static void print_ret_code(__u8 code)
{
switch(code) {
case 0:
printk(KERN_INFO "Success\n");
break;
case 1:
IRDA_WARNING("IrLAN: Insufficient resources\n");
break;
case 2:
IRDA_WARNING("IrLAN: Invalid command format\n");
break;
case 3:
IRDA_WARNING("IrLAN: Command not supported\n");
break;
case 4:
IRDA_WARNING("IrLAN: Parameter not supported\n");
break;
case 5:
IRDA_WARNING("IrLAN: Value not supported\n");
break;
case 6:
IRDA_WARNING("IrLAN: Not open\n");
break;
case 7:
IRDA_WARNING("IrLAN: Authentication required\n");
break;
case 8:
IRDA_WARNING("IrLAN: Invalid password\n");
break;
case 9:
IRDA_WARNING("IrLAN: Protocol error\n");
break;
case 255:
IRDA_WARNING("IrLAN: Asynchronous status\n");
break;
}
}
/*
* Function irlan_client_parse_response (self, skb)
*
* Extract all parameters from received buffer, then feed them to
* check_params for parsing
*/
void irlan_client_parse_response(struct irlan_cb *self, struct sk_buff *skb)
{
__u8 *frame;
__u8 *ptr;
int count;
int ret;
__u16 val_len;
int i;
char *name;
char *value;
IRDA_ASSERT(skb != NULL, return;);
IRDA_DEBUG(4, "%s() skb->len=%d\n", __FUNCTION__ , (int) skb->len);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
if (!skb) {
IRDA_ERROR("%s(), Got NULL skb!\n", __FUNCTION__);
return;
}
frame = skb->data;
/*
* Check return code and print it if not success
*/
if (frame[0]) {
print_ret_code(frame[0]);
return;
}
name = kmalloc(255, GFP_ATOMIC);
if (!name)
return;
value = kmalloc(1016, GFP_ATOMIC);
if (!value) {
kfree(name);
return;
}
/* How many parameters? */
count = frame[1];
IRDA_DEBUG(4, "%s(), got %d parameters\n", __FUNCTION__ , count);
ptr = frame+2;
/* For all parameters */
for (i=0; i<count;i++) {
ret = irlan_extract_param(ptr, name, value, &val_len);
if (ret < 0) {
IRDA_DEBUG(2, "%s(), IrLAN, Error!\n", __FUNCTION__ );
break;
}
ptr += ret;
irlan_check_response_param(self, name, value, val_len);
}
/* Cleanup */
kfree(name);
kfree(value);
}
/*
* Function irlan_check_response_param (self, param, value, val_len)
*
* Check which parameter is received and update local variables
*
*/
static void irlan_check_response_param(struct irlan_cb *self, char *param,
char *value, int val_len)
{
__u16 tmp_cpu; /* Temporary value in host order */
__u8 *bytes;
int i;
IRDA_DEBUG(4, "%s(), parm=%s\n", __FUNCTION__ , param);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* Media type */
if (strcmp(param, "MEDIA") == 0) {
if (strcmp(value, "802.3") == 0)
self->media = MEDIA_802_3;
else
self->media = MEDIA_802_5;
return;
}
if (strcmp(param, "FILTER_TYPE") == 0) {
if (strcmp(value, "DIRECTED") == 0)
self->client.filter_type |= IRLAN_DIRECTED;
else if (strcmp(value, "FUNCTIONAL") == 0)
self->client.filter_type |= IRLAN_FUNCTIONAL;
else if (strcmp(value, "GROUP") == 0)
self->client.filter_type |= IRLAN_GROUP;
else if (strcmp(value, "MAC_FRAME") == 0)
self->client.filter_type |= IRLAN_MAC_FRAME;
else if (strcmp(value, "MULTICAST") == 0)
self->client.filter_type |= IRLAN_MULTICAST;
else if (strcmp(value, "BROADCAST") == 0)
self->client.filter_type |= IRLAN_BROADCAST;
else if (strcmp(value, "IPX_SOCKET") == 0)
self->client.filter_type |= IRLAN_IPX_SOCKET;
}
if (strcmp(param, "ACCESS_TYPE") == 0) {
if (strcmp(value, "DIRECT") == 0)
self->client.access_type = ACCESS_DIRECT;
else if (strcmp(value, "PEER") == 0)
self->client.access_type = ACCESS_PEER;
else if (strcmp(value, "HOSTED") == 0)
self->client.access_type = ACCESS_HOSTED;
else {
IRDA_DEBUG(2, "%s(), unknown access type!\n", __FUNCTION__ );
}
}
/* IRLAN version */
if (strcmp(param, "IRLAN_VER") == 0) {
IRDA_DEBUG(4, "IrLAN version %d.%d\n", (__u8) value[0],
(__u8) value[1]);
self->version[0] = value[0];
self->version[1] = value[1];
return;
}
/* Which remote TSAP to use for data channel */
if (strcmp(param, "DATA_CHAN") == 0) {
self->dtsap_sel_data = value[0];
IRDA_DEBUG(4, "Data TSAP = %02x\n", self->dtsap_sel_data);
return;
}
if (strcmp(param, "CON_ARB") == 0) {
memcpy(&tmp_cpu, value, 2); /* Align value */
le16_to_cpus(&tmp_cpu); /* Convert to host order */
self->client.recv_arb_val = tmp_cpu;
IRDA_DEBUG(2, "%s(), receive arb val=%d\n", __FUNCTION__ ,
self->client.recv_arb_val);
}
if (strcmp(param, "MAX_FRAME") == 0) {
memcpy(&tmp_cpu, value, 2); /* Align value */
le16_to_cpus(&tmp_cpu); /* Convert to host order */
self->client.max_frame = tmp_cpu;
IRDA_DEBUG(4, "%s(), max frame=%d\n", __FUNCTION__ ,
self->client.max_frame);
}
/* RECONNECT_KEY, in case the link goes down! */
if (strcmp(param, "RECONNECT_KEY") == 0) {
IRDA_DEBUG(4, "Got reconnect key: ");
/* for (i = 0; i < val_len; i++) */
/* printk("%02x", value[i]); */
memcpy(self->client.reconnect_key, value, val_len);
self->client.key_len = val_len;
IRDA_DEBUG(4, "\n");
}
/* FILTER_ENTRY, have we got an ethernet address? */
if (strcmp(param, "FILTER_ENTRY") == 0) {
bytes = value;
IRDA_DEBUG(4, "Ethernet address = %02x:%02x:%02x:%02x:%02x:%02x\n",
bytes[0], bytes[1], bytes[2], bytes[3], bytes[4],
bytes[5]);
for (i = 0; i < 6; i++)
self->dev->dev_addr[i] = bytes[i];
}
}
/*
* Function irlan_client_get_value_confirm (obj_id, value)
*
* Got results from remote LM-IAS
*
*/
void irlan_client_get_value_confirm(int result, __u16 obj_id,
struct ias_value *value, void *priv)
{
struct irlan_cb *self;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(priv != NULL, return;);
self = (struct irlan_cb *) priv;
IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
/* We probably don't need to make any more queries */
iriap_close(self->client.iriap);
self->client.iriap = NULL;
/* Check if request succeeded */
if (result != IAS_SUCCESS) {
IRDA_DEBUG(2, "%s(), got NULL value!\n", __FUNCTION__ );
irlan_do_client_event(self, IRLAN_IAS_PROVIDER_NOT_AVAIL,
NULL);
return;
}
switch (value->type) {
case IAS_INTEGER:
self->dtsap_sel_ctrl = value->t.integer;
if (value->t.integer != -1) {
irlan_do_client_event(self, IRLAN_IAS_PROVIDER_AVAIL,
NULL);
return;
}
irias_delete_value(value);
break;
default:
IRDA_DEBUG(2, "%s(), unknown type!\n", __FUNCTION__ );
break;
}
irlan_do_client_event(self, IRLAN_IAS_PROVIDER_NOT_AVAIL, NULL);
}
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