[29/46] connector: Provide the senders credentials to the callback

From: Greg KH
Date: Fri Oct 16 2009 - 13:24:00 EST


2.6.31-stable review patch. If anyone has any objections, please let us know.

------------------
From: Philipp Reisner <philipp.reisner@xxxxxxxxxx>

commit 7069331dbe7155f23966f5944109f909fea0c7e4 upstream

Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
Acked-by: Evgeniy Polyakov <zbr@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
Documentation/connector/cn_test.c | 4 +---
Documentation/connector/connector.txt | 8 ++++----
drivers/connector/cn_proc.c | 3 +--
drivers/connector/cn_queue.c | 10 +++++++---
drivers/connector/connector.c | 6 +++---
drivers/md/dm-log-userspace-transfer.c | 3 +--
drivers/staging/dst/dcore.c | 3 +--
drivers/staging/pohmelfs/config.c | 3 +--
drivers/video/uvesafb.c | 3 +--
drivers/w1/w1_netlink.c | 3 +--
include/linux/connector.h | 6 +++---
11 files changed, 24 insertions(+), 28 deletions(-)

--- a/Documentation/connector/cn_test.c
+++ b/Documentation/connector/cn_test.c
@@ -32,10 +32,8 @@ static char cn_test_name[] = "cn_test";
static struct sock *nls;
static struct timer_list cn_test_timer;

-void cn_test_callback(void *data)
+static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = (struct cn_msg *)data;
-
printk("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
__func__, jiffies, msg->id.idx, msg->id.val,
msg->seq, msg->ack, msg->len, (char *)msg->data);
--- a/Documentation/connector/connector.txt
+++ b/Documentation/connector/connector.txt
@@ -23,7 +23,7 @@ handling... Connector allows any kernel
based networking for inter-process communication in a significantly
easier way:

-int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
+int cn_add_callback(struct cb_id *id, char *name, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
void cn_netlink_send(struct cn_msg *msg, u32 __group, int gfp_mask);

struct cb_id
@@ -53,15 +53,15 @@ struct cn_msg
Connector interfaces.
/*****************************************/

-int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
+int cn_add_callback(struct cb_id *id, char *name, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));

Registers new callback with connector core.

struct cb_id *id - unique connector's user identifier.
It must be registered in connector.h for legal in-kernel users.
char *name - connector's callback symbolic name.
-void (*callback) (void *) - connector's callback.
- Argument must be dereferenced to struct cn_msg *.
+void (*callback) (struct cn..) - connector's callback.
+ cn_msg and the sender's credentials

void cn_del_callback(struct cb_id *id);

--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -202,9 +202,8 @@ static void cn_proc_ack(int err, int rcv
* cn_proc_mcast_ctl
* @data: message sent from userspace via the connector
*/
-static void cn_proc_mcast_ctl(void *data)
+static void cn_proc_mcast_ctl(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = data;
enum proc_cn_mcast_op *mc_op = NULL;
int err = 0;

--- a/drivers/connector/cn_queue.c
+++ b/drivers/connector/cn_queue.c
@@ -79,8 +79,9 @@ void cn_queue_wrapper(struct work_struct
container_of(work, struct cn_callback_entry, work);
struct cn_callback_data *d = &cbq->data;
struct cn_msg *msg = NLMSG_DATA(nlmsg_hdr(d->skb));
+ struct netlink_skb_parms *nsp = &NETLINK_CB(d->skb);

- d->callback(msg);
+ d->callback(msg, nsp);

d->destruct_data(d->ddata);
d->ddata = NULL;
@@ -88,7 +89,9 @@ void cn_queue_wrapper(struct work_struct
kfree(d->free);
}

-static struct cn_callback_entry *cn_queue_alloc_callback_entry(char *name, struct cb_id *id, void (*callback)(void *))
+static struct cn_callback_entry *
+cn_queue_alloc_callback_entry(char *name, struct cb_id *id,
+ void (*callback)(struct cn_msg *, struct netlink_skb_parms *))
{
struct cn_callback_entry *cbq;

@@ -121,7 +124,8 @@ int cn_cb_equal(struct cb_id *i1, struct
return ((i1->idx == i2->idx) && (i1->val == i2->val));
}

-int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *))
+int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id,
+ void (*callback)(struct cn_msg *, struct netlink_skb_parms *))
{
struct cn_callback_entry *cbq, *__cbq;
int found = 0;
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -268,7 +268,8 @@ static void cn_notify(struct cb_id *id,
*
* May sleep.
*/
-int cn_add_callback(struct cb_id *id, char *name, void (*callback)(void *))
+int cn_add_callback(struct cb_id *id, char *name,
+ void (*callback)(struct cn_msg *, struct netlink_skb_parms *))
{
int err;
struct cn_dev *dev = &cdev;
@@ -350,9 +351,8 @@ static int cn_ctl_msg_equals(struct cn_c
*
* Used for notification of a request's processing.
*/
-static void cn_callback(void *data)
+static void cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = data;
struct cn_ctl_msg *ctl;
struct cn_ctl_entry *ent;
u32 size;
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -129,9 +129,8 @@ static int fill_pkg(struct cn_msg *msg,
* This is the connector callback that delivers data
* that was sent from userspace.
*/
-static void cn_ulog_callback(void *data)
+static void cn_ulog_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = (struct cn_msg *)data;
struct dm_ulog_request *tfr = (struct dm_ulog_request *)(msg + 1);

spin_lock(&receiving_list_lock);
--- a/drivers/staging/dst/dcore.c
+++ b/drivers/staging/dst/dcore.c
@@ -846,10 +846,9 @@ static dst_command_func dst_commands[] =
/*
* Configuration parser.
*/
-static void cn_dst_callback(void *data)
+static void cn_dst_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
struct dst_ctl *ctl;
- struct cn_msg *msg = data;
int err;
struct dst_ctl_ack ack;
struct dst_node *n = NULL, *tmp;
--- a/drivers/staging/pohmelfs/config.c
+++ b/drivers/staging/pohmelfs/config.c
@@ -446,9 +446,8 @@ out_unlock:
return err;
}

-static void pohmelfs_cn_callback(void *data)
+static void pohmelfs_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = data;
int err;

switch (msg->flags) {
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -67,9 +67,8 @@ static DEFINE_MUTEX(uvfb_lock);
* find the kernel part of the task struct, copy the registers and
* the buffer contents and then complete the task.
*/
-static void uvesafb_cn_callback(void *data)
+static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = data;
struct uvesafb_task *utask;
struct uvesafb_ktask *task;

--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -306,9 +306,8 @@ static int w1_netlink_send_error(struct
return error;
}

-static void w1_cn_callback(void *data)
+static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
- struct cn_msg *msg = data;
struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);
struct w1_netlink_cmd *cmd;
struct w1_slave *sl;
--- a/include/linux/connector.h
+++ b/include/linux/connector.h
@@ -136,7 +136,7 @@ struct cn_callback_data {
void *ddata;

struct sk_buff *skb;
- void (*callback) (struct cn_msg *);
+ void (*callback) (struct cn_msg *, struct netlink_skb_parms *);

void *free;
};
@@ -167,11 +167,11 @@ struct cn_dev {
struct cn_queue_dev *cbdev;
};

-int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
+int cn_add_callback(struct cb_id *, char *, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
void cn_del_callback(struct cb_id *);
int cn_netlink_send(struct cn_msg *, u32, gfp_t);

-int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
+int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);

int queue_cn_work(struct cn_callback_entry *cbq, struct work_struct *work);


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