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/**
* MobiCore KernelApi module
*
* <!-- Copyright Giesecke & Devrient GmbH 2009-2012 -->
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/netlink.h>
#include <linux/kthread.h>
#include <net/sock.h>
#include <linux/list.h>
#include "connection.h"
#include "common.h"
#define MC_DAEMON_NETLINK 17
struct mc_kernelapi_ctx {
struct sock *sk;
struct list_head peers;
atomic_t counter;
};
struct mc_kernelapi_ctx *mod_ctx; /* = NULL; */
/*----------------------------------------------------------------------------*/
/* get a unique ID */
unsigned int mcapi_unique_id(
void
)
{
return (unsigned int)atomic_inc_return(
&(mod_ctx->counter));
}
/*----------------------------------------------------------------------------*/
static struct connection *mcapi_find_connection(
uint32_t seq
)
{
struct connection *tmp;
struct list_head *pos;
/* Get session for session_id */
list_for_each(pos, &mod_ctx->peers) {
tmp = list_entry(pos, struct connection, list);
if (tmp->sequence_magic == seq)
return tmp;
}
return NULL;
}
/*----------------------------------------------------------------------------*/
void mcapi_insert_connection(
struct connection *connection
)
{
list_add_tail(&(connection->list), &(mod_ctx->peers));
connection->socket_descriptor = mod_ctx->sk;
}
void mcapi_remove_connection(
uint32_t seq
)
{
struct connection *tmp;
struct list_head *pos, *q;
/* Delete all session objects. Usually this should not be needed as
closeDevice() requires that all sessions have been closed before.*/
list_for_each_safe(pos, q, &mod_ctx->peers) {
tmp = list_entry(pos, struct connection, list);
if (tmp->sequence_magic == seq) {
list_del(pos);
break;
}
}
}
/*----------------------------------------------------------------------------*/
static int mcapi_process(
struct sk_buff *skb,
struct nlmsghdr *nlh
)
{
struct connection *c;
int length;
int seq;
pid_t pid;
int ret;
pid = nlh->nlmsg_pid;
length = nlh->nlmsg_len;
seq = nlh->nlmsg_seq;
MCDRV_DBG_VERBOSE("nlmsg len %d type %d pid 0x%X seq %d\n",
length, nlh->nlmsg_type, pid, seq);
do {
c = mcapi_find_connection(seq);
if (!c) {
MCDRV_ERROR("Invalid incomming connection - seq=%u!",
seq);
ret = -1;
break;
}
/* Pass the buffer to the appropriate connection */
connection_process(c, skb);
ret = 0;
} while (false);
return ret;
}
/*----------------------------------------------------------------------------*/
static void mcapi_callback(
struct sk_buff *skb
)
{
struct nlmsghdr *nlh = nlmsg_hdr(skb);
int len = skb->len;
int err = 0;
while (NLMSG_OK(nlh, len)) {
err = mcapi_process(skb, nlh);
/* if err or if this message says it wants a response */
if (err || (nlh->nlmsg_flags & NLM_F_ACK))
netlink_ack(skb, nlh, err);
nlh = NLMSG_NEXT(nlh, len);
}
}
/*----------------------------------------------------------------------------*/
static int __init mcapi_init(void)
{
printk(KERN_INFO "Mobicore API module initialized!\n");
mod_ctx = kzalloc(sizeof(struct mc_kernelapi_ctx), GFP_KERNEL);
/* start kernel thread */
mod_ctx->sk = netlink_kernel_create(&init_net, MC_DAEMON_NETLINK, 0,
mcapi_callback, NULL, THIS_MODULE);
if (!mod_ctx->sk) {
MCDRV_ERROR("register of recieve handler failed");
return -EFAULT;
}
INIT_LIST_HEAD(&mod_ctx->peers);
return 0;
}
static void __exit mcapi_exit(void)
{
printk(KERN_INFO "Unloading Mobicore API module.\n");
if (mod_ctx->sk != NULL) {
netlink_kernel_release(mod_ctx->sk);
mod_ctx->sk = NULL;
}
kfree(mod_ctx);
mod_ctx = NULL;
}
module_init(mcapi_init);
module_exit(mcapi_exit);
MODULE_AUTHOR("Giesecke & Devrient GmbH");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MobiCore API driver");
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