-#define DEBUG 1
+/*
+ * Copyright: (c) 2012 Czech Technical University in Prague
+ *
+ * Authors:
+ * Radek Matějka <radek.matejka@gmail.com>
+ * Michal Sojka <sojkam1@fel.cvut.cz>
+ *
+ * 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.
+ */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
-#include <linux/sched.h>
-#include <linux/delay.h>
-#include <linux/wait.h>
-#include <linux/netdevice.h>
-#include <linux/socket.h>
-#include <linux/if_arp.h>
-#include <linux/net.h>
-#include <linux/netdevice.h>
-#include <linux/can/core.h>
-#include <linux/can.h>
-#include <net/rtnetlink.h>
+#include <linux/file.h>
#include <net/sock.h>
+#include <linux/can.h>
+#include <linux/miscdevice.h>
#include "canethgw.h"
-#include <linux/completion.h>
-#include <linux/mutex.h>
-#include <net/inet_common.h>
-
-MODULE_LICENSE( "GPL" );
-
-static int cegw_udp_can( void* data );
-inline static void cegw_udp_send( struct socket* udp_sock, struct can_frame* cf, struct in_addr ipaddr, u16 port );
-static int cegw_can_udp( void* data );
-inline static void cegw_can_send( struct socket* can_sock, struct can_frame* cf, int ifindex );
-static int cegw_thread_start( void* data );
-static int cegw_thread_stop( void );
-
-enum __cegw_state
-{
- CEGW_RUN,
- CEGW_STOP,
- CEGW_EXIT
-};
-
-struct cegw_rule
-{
- int can_ifindex;
- struct in_addr eth_ip;
- unsigned short eth_port;
- struct hlist_node list;
-};
-
-struct cegw_setting
-{
- struct in_addr eth_ip;
- unsigned short eth_port;
-};
-static int cegw_state = CEGW_STOP;
-static struct socket* can_sock = NULL, * udp_sock = NULL;
-static struct task_struct* eth_to_can = NULL, * can_to_eth = NULL;
-static struct notifier_block notifier;
+MODULE_LICENSE("GPL");
-HLIST_HEAD( cegw_rule_can_eth );
-HLIST_HEAD( cegw_rule_eth_can );
-DEFINE_MUTEX( cegw_mutex );
+static int cegw_udp2can(void *data);
+static int cegw_udp_send(struct socket *udp_sock, struct can_frame *cf,
+ struct sockaddr_in* addr);
+static int cegw_can2udp(void *data);
+static int cegw_can_send(struct socket *can_sock, struct can_frame *cf);
+static int cegw_thread_start(void *data);
+static int cegw_thread_stop(struct cegw_job *job);
+static void cegw_job_release(struct kref *ref);
-inline static void cegw_udp_send( struct socket* udp_sock, struct can_frame* cf, struct in_addr ipaddr, u16 port )
+static int cegw_udp_send(struct socket *udp_sock, struct can_frame *cf, struct sockaddr_in* addr)
{
struct msghdr mh;
- struct sockaddr_in addr;
struct kvec vec;
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons( port );
- addr.sin_addr = ipaddr;
-
- mh.msg_name = &addr;
- mh.msg_namelen = sizeof( addr );
+ int err;
+
+ mh.msg_name = addr;
+ mh.msg_namelen = sizeof(*addr);
mh.msg_control = NULL;
mh.msg_controllen = 0;
mh.msg_flags = 0;
-
+
vec.iov_base = cf;
- vec.iov_len = sizeof( *cf );
-
- kernel_sendmsg( udp_sock, &mh, &vec, 1, sizeof( *cf ) );
+ vec.iov_len = sizeof(*cf);
+
+ err = kernel_sendmsg(udp_sock, &mh, &vec, 1, sizeof(*cf));
+
+ return err;
}
-inline static void cegw_can_send( struct socket* can_sock, struct can_frame* cf, int ifindex )
+static int cegw_can_send(struct socket* can_sock, struct can_frame* cf)
{
struct msghdr mh;
struct kvec vec;
- struct sockaddr_can addr;
-
- addr.can_family = AF_CAN;
- addr.can_ifindex = ifindex;
-
- mh.msg_name = &addr;
- mh.msg_namelen = sizeof( addr );
+ int err;
+
+ mh.msg_name = NULL;
+ mh.msg_namelen = 0;
mh.msg_control = NULL;
mh.msg_controllen = 0;
mh.msg_flags = 0;
-
+
vec.iov_base = cf;
- vec.iov_len = sizeof( *cf );
-
- kernel_sendmsg( can_sock, &mh, &vec, 1, sizeof( *cf ) );
+ vec.iov_len = sizeof(*cf);
+
+ err = kernel_sendmsg(can_sock, &mh, &vec, 1, sizeof(*cf));
+
+ return err;
}
-/**
- * cegw_udp_can - performs udp->can routing
+/**
+ * cegw_udp2can - performs udp->can routing
+ *
* This function is run as a thread.
*/
-static int cegw_udp_can( void* data )
+static int cegw_udp2can(void *data)
{
struct can_frame cf;
struct kvec vec;
struct msghdr mh;
- struct cegw_rule* rule;
- struct hlist_node* pos;
- int can_ifidx;
- int recv_size;
+ struct cegw_job *job = (struct cegw_job *)data;
+ struct socket *udp_sock = NULL, *can_sock = NULL;
+ int ret = 0;
- mh.msg_name = NULL;
- mh.msg_namelen = 0;
- mh.msg_iov = NULL;
- mh.msg_iovlen = 0;
- mh.msg_control = NULL;
- mh.msg_controllen = 0;
- mh.msg_flags = 0;
+ memset(&mh, 0, sizeof(mh));
+ udp_sock = job->udp_sock;
+ can_sock = job->can_sock;
- while( 1 )
- {
- if( cegw_state == CEGW_STOP )
- break;
+ while (1) {
vec.iov_base = &cf;
vec.iov_len = sizeof(cf);
- recv_size = kernel_recvmsg( udp_sock, &mh, &vec, 1, sizeof(cf), 0 );
- /* recv_size == 0 when shutting down */
- if( recv_size != sizeof(cf) || recv_size == 0 )
- {
- continue;
- } else if( recv_size < 0 )
- {
- return -1;
- }
+ ret = kernel_recvmsg(udp_sock, &mh, &vec, 1,
+ sizeof(cf), 0);
+ if (ret < 1)
+ break;
- hlist_for_each_entry_rcu( rule, pos, &cegw_rule_eth_can, list )
- {
- rcu_read_lock();
- can_ifidx = rule->can_ifindex;
- rcu_read_unlock();
- /* ToDo: from filter */
- cegw_can_send( can_sock, &cf, can_ifidx );
- }
+ cf.can_id = be32_to_cpu(cf.can_id);
+ cegw_can_send(can_sock, &cf);
}
- return 0;
+ cegw_thread_stop(job);
+ kref_put(&job->refcount, cegw_job_release);
+ do_exit(ret);
}
/**
- * cegw_can_udp - performs can->udp routing
+ * cegw_can2udp - performs can->udp routing
+ *
+ * This function is run as a thread.
*/
-static int cegw_can_udp( void* data )
+static int cegw_can2udp(void* data)
{
struct msghdr mh;
struct kvec vec;
struct can_frame cf;
- struct sockaddr_can ca;
- struct cegw_rule* rule;
- struct hlist_node* pos;
- struct in_addr eth_ip;
- u16 eth_port;
- int recv_size;
-
- mh.msg_name = &ca;
- mh.msg_namelen = sizeof( ca );
- mh.msg_control = NULL;
- mh.msg_controllen = 0;
- mh.msg_flags = 0;
+ struct cegw_job* job = (struct cegw_job*)data;
+ struct socket* udp_sock = job->udp_sock;
+ struct socket* can_sock = job->can_sock;
+ int i;
+ int ret;
- while( 1 )
- {
- if( cegw_state == CEGW_STOP )
- break;
+ memset(&mh, 0, sizeof(mh));
+
+ while (1) {
vec.iov_base = &cf;
- vec.iov_len = sizeof( cf );
-
- recv_size = kernel_recvmsg( can_sock, &mh, &vec, 1, sizeof( cf ), 0 );
- if( recv_size != sizeof(cf) || recv_size == 0 )
- {
- continue;
- } else if( recv_size < 0 )
- {
- return -1;
- }
+ vec.iov_len = sizeof(cf);
+
+ ret = kernel_recvmsg(can_sock, &mh, &vec, 1,
+ sizeof(cf), 0);
+ if (ret < 1)
+ break;
- hlist_for_each_entry_rcu( rule, pos, &cegw_rule_can_eth, list )
- {
- rcu_read_lock();
- eth_ip = rule->eth_ip;
- eth_port = rule->eth_port;
- rcu_read_unlock();
- if( rule->can_ifindex == ca.can_ifindex )
- cegw_udp_send( udp_sock, &cf, eth_ip, eth_port );
+ cf.can_id = cpu_to_be32(cf.can_id);
+ for (i=0; i<job->udp_dstcnt; i++) {
+ cegw_udp_send(udp_sock, &cf, &job->udp_dst[i]);
}
}
-
- return 0;
+
+ cegw_thread_stop(job);
+ kref_put(&job->refcount, cegw_job_release);
+ do_exit(ret);
}
-static int cegw_newroute( struct sk_buff* skb, struct nlmsghdr* nlh, void* arg )
+static void cegw_job_release(struct kref *ref)
{
- struct nlattr* tb[ CEGW_MAX+1 ];
- struct cegw_rule* rule = NULL;
- int ifindex;
- struct rtmsg* r;
- struct in_addr ip;
- unsigned short port;
- struct cegw_setting* set;
- int err = 0;
-
- if( nlmsg_len(nlh) < sizeof(*r) )
- return -EINVAL;
+ struct cegw_job *job = container_of(ref, struct cegw_job, refcount);
- r = nlmsg_data( nlh );
+ fput(job->can_sock->file);
+ fput(job->udp_sock->file);
+ kfree(job);
+}
- if( r->rtm_family != AF_CAN )
- return -EPFNOSUPPORT;
+/**
+ * cegw_thread_start - start working threads
+ * @data: (struct cegw_job *) with sockets and udp addresses filled in
+ *
+ * Two threads are started. One is serving udp->can routing and the other
+ * can->udp.
+ */
+static int cegw_thread_start(void *data)
+{
+ struct task_struct *task = NULL;
+ struct cegw_job *job = (struct cegw_job *)data;
- err = nlmsg_parse( nlh, sizeof(*r), tb, CEGW_MAX, NULL );
- if( err < 0 )
- {
- pr_devel( "canethgw: nlmsg_parse error\n" );
- return err;
- }
+ kref_init(&job->refcount);
+ kref_get(&job->refcount);
- if( tb[CEGW_CMD_INFO] == NULL )
- {
- pr_devel( "canethgw: CEGW_CMD_INFO is missing in rtmsg\n" );
- return -EINVAL;
+ task = kthread_run(cegw_udp2can, data, "canethgw_udp2can");
+ if (IS_ERR(task)) {
+ kref_sub(&job->refcount, 2, cegw_job_release);
+ return -ENOMEM;
}
- switch( *(int*)nla_data( tb[CEGW_CMD_INFO] ) )
- {
- case CEGW_LISTEN:
- if( !tb[CEGW_ETH_IP] || !tb[CEGW_ETH_PORT] )
- {
- pr_devel( "canethgw: missing attribute for CEGW_LISTEN\n" );
- return -EINVAL;
- }
-
- /* ToDo: valid listen address */
- set = kmalloc( sizeof(*set), GFP_KERNEL );
- set->eth_ip = *(struct in_addr*)nla_data( tb[CEGW_ETH_IP] );
- set->eth_port = *(unsigned short*)nla_data( tb[CEGW_ETH_PORT] );
- kthread_run( cegw_thread_start, set, "canethgw" );
- break;
- case CEGW_RULE_CAN_ETH:
- if( !tb[CEGW_ETH_IP] || !tb[CEGW_ETH_PORT] || !tb[CEGW_CAN_IFINDEX] )
- {
- pr_devel( "canethgw: missing attribute for CEGW_RULE_CAN_ETH\n" );
- return -EINVAL;
- }
-
- ifindex = *(int*)nla_data( tb[CEGW_CAN_IFINDEX] );
- ip = *(struct in_addr*)nla_data( tb[CEGW_ETH_IP] );
- port = *(unsigned short*)nla_data( tb[CEGW_ETH_PORT] );
- pr_devel( "canethgw: new can->eth rule - (%d)->(%x:%hu)\n", ifindex, ip.s_addr, port );
-
- rule = kmalloc( sizeof(struct cegw_rule), GFP_KERNEL );
- if( rule == NULL )
- {
- break;
- }
-
- rule->can_ifindex = ifindex;
- rule->eth_ip = ip;
- rule->eth_port = port;
-
- hlist_add_head_rcu( &rule->list, &cegw_rule_can_eth );
- break;
- case CEGW_RULE_ETH_CAN:
- if( !tb[CEGW_ETH_IP] || !tb[CEGW_ETH_PORT] || !tb[CEGW_CAN_IFINDEX] )
- {
- pr_devel( "canethgw: missing attribute for CEGW_RULE_ETH_CAN\n" );
- return -EINVAL;
- }
-
- ifindex = *(int*)nla_data( tb[CEGW_CAN_IFINDEX] );
- ip = *(struct in_addr*)nla_data( tb[CEGW_ETH_IP] );
- port = *(unsigned short*)nla_data( tb[CEGW_ETH_PORT] );
- pr_devel( "canethgw: new eth->can rule - (%x:%hu)->(%d)\n", ip.s_addr, port, ifindex );
-
- rule = kmalloc( sizeof(struct cegw_rule), GFP_KERNEL );
- if( rule == NULL )
- {
- break;
- }
-
- rule->can_ifindex = ifindex;
- rule->eth_ip = ip;
- rule->eth_port = port;
-
- hlist_add_head_rcu( &rule->list, &cegw_rule_eth_can );
- break;
- default:
- pr_devel( "canethgw: unknown CEGW_CMD_INFO\n" );
- break;
+ task = kthread_run(cegw_can2udp, data, "canethgw_can2udp");
+ if (IS_ERR(task)) {
+ cegw_thread_stop(job);
+ kref_put(&job->refcount, cegw_job_release);
+ return -ENOMEM;
}
return 0;
}
-static void cegw_flush( void )
-{
- struct cegw_rule* rule;
- struct hlist_node* pos,* n;
-
- hlist_for_each_entry_safe( rule, pos, n, &cegw_rule_can_eth, list )
- {
- hlist_del( &rule->list );
- kfree( rule );
- }
- hlist_for_each_entry_safe( rule, pos, n, &cegw_rule_eth_can, list )
- {
- hlist_del( &rule->list );
- kfree( rule );
- }
-}
-
-static int cegw_delroute( struct sk_buff* skb, struct nlmsghdr* nlh, void* arg )
+/**
+ * cegw_thread_stop - stops threads
+ */
+static int cegw_thread_stop(struct cegw_job *job)
{
- struct rtmsg* r;
- struct nlattr* tb[ CEGW_MAX+1 ];
- int err = 0;
-
- if( nlmsg_len(nlh) < sizeof(*r) )
- return -EINVAL;
-
- r = nlmsg_data( nlh );
-
- if( r->rtm_family != AF_CAN )
- return -EPFNOSUPPORT;
-
- err = nlmsg_parse( nlh, sizeof(struct rtmsg), tb, CEGW_MAX, NULL );
- if( err != 0 )
- return -EINVAL;
+ int how = SHUT_RDWR;
+ struct sock *sk = NULL;
+ struct socket *udp_sock = job->udp_sock;
+ struct socket *can_sock = job->can_sock;
- if( tb[CEGW_CMD_INFO] == NULL )
- {
- pr_devel( "canethgw: CEGW_CMD_INFO is missing in rtmsg\n" );
- return -EINVAL;
- }
-
- if( *(int*)nla_data( tb[CEGW_CMD_INFO] ) != CEGW_FLUSH )
- {
- return -EINVAL;
- }
+ kernel_sock_shutdown(udp_sock, SHUT_RDWR);
- cegw_flush();
+ /* PF_CAN sockets do not implement shutdown - do it manualy */
+ sk = can_sock->sk;
+ how++;
+ lock_sock(sk);
+ sk->sk_shutdown |= how;
+ sk->sk_state_change(sk);
+ release_sock(sk);
return 0;
}
-static int cegw_put_rule( struct sk_buff* skb, int type, struct cegw_rule* rule )
+static int cegw_open(struct inode *inode, struct file *file)
{
- int ifindex;
- struct in_addr ip;
- unsigned short port;
- struct nlmsghdr* nlh;
-
- ifindex = rule->can_ifindex;
- ip = rule->eth_ip;
- port = rule->eth_port;
-
- nlh = nlmsg_put( skb, 0, 0, 0, 0, 0 );
- if( nlh == NULL )
- return -EMSGSIZE;
-
- /* type */
- if( nla_put( skb, CEGW_TYPE, sizeof(type), &type ) < 0 )
- goto cancel;
- else
- nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN( sizeof(type) );
-
- /* can ifindex */
- if( nla_put( skb, CEGW_CAN_IFINDEX, sizeof(ifindex), &ifindex ) < 0 )
- goto cancel;
- else
- nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN( sizeof(ifindex) );
-
- /* ip adress */
- if( nla_put( skb, CEGW_ETH_IP, sizeof(ip), &ip) < 0 )
- goto cancel;
- else
- nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN( sizeof(ip) );
-
- /* port */
- if( nla_put( skb, CEGW_ETH_PORT, sizeof(port), &port ) < 0 )
- goto cancel;
- else
- nlh->nlmsg_len += NLA_HDRLEN + NLA_ALIGN( sizeof(port) );
-
- return skb->len;
-
-cancel:
- nlmsg_cancel( skb, nlh );
- return -EMSGSIZE;
-}
-
-static int cegw_getroute( struct sk_buff* skb, struct netlink_callback* cb )
-{
- struct cegw_rule* rule;
- struct hlist_node* pos;
- int idx = 0;
- int s_idx = cb->args[0];
-
- /* ToDo: skb max size */
-
- rcu_read_lock();
- hlist_for_each_entry_rcu( rule, pos, &cegw_rule_eth_can, list )
- {
- if( idx < s_idx )
- goto cont1;
-
- if( cegw_put_rule( skb, CEGW_RULE_ETH_CAN, rule ) < 0 )
- goto brk;
-cont1:
- idx++;
- }
- rcu_read_unlock();
+ file->private_data = NULL;
- rcu_read_lock();
- hlist_for_each_entry_rcu( rule, pos, &cegw_rule_can_eth, list )
- {
- if( idx < s_idx )
- goto cont2;
+ if (try_module_get(THIS_MODULE) == false)
+ return -EAGAIN;
- if( cegw_put_rule( skb, CEGW_RULE_CAN_ETH, rule ) < 0 )
- goto brk;
-
-cont2:
- idx++;
- }
- rcu_read_unlock();
-
-brk:
- cb->args[0] = idx;
-
- return skb->len;
+ return 0;
}
-static int cegw_notifier( struct notifier_block* nb, unsigned long msg, void* data )
+static int cegw_release(struct inode *inode, struct file *file)
{
- struct net_device* dev = (struct net_device*)data;
- struct cegw_rule* rule;
- struct hlist_node* pos,* n;
-
- if( !net_eq(dev_net(dev), &init_net) )
- return NOTIFY_DONE;
- if( dev->type != ARPHRD_CAN )
- return NOTIFY_DONE;
-
- if( msg == NETDEV_UNREGISTER )
- {
- hlist_for_each_entry_safe( rule, pos, n, &cegw_rule_eth_can, list )
- {
- if( rule->can_ifindex == dev->ifindex )
- {
- hlist_del( &rule->list );
- kfree( rule );
- }
- }
+ struct cegw_job *job = (struct cegw_job *)file->private_data;
- hlist_for_each_entry_safe( rule, pos, n, &cegw_rule_can_eth, list )
- {
- if( rule->can_ifindex == dev->ifindex )
- {
- hlist_del( &rule->list );
- kfree( rule );
- }
- }
+ if (job) {
+ cegw_thread_stop(job);
}
- return NOTIFY_DONE;
+ module_put(THIS_MODULE);
+ return 0;
}
/**
- * cegw_thread_start - start working threads
- * Two threads are started. One is serving udp->can routing and the other
- * can->udp.
+ * cegw_ioctl_start - processes ioctl CEGW_IOCTL_START call
*
- * @return 0 on success, -1 otherwise
+ * The function takes over cegw_ioctl structure from userspace and
+ * prepares cegw_job structure. The cegw_job is stored in
+ * file->private_data and used by kernel threads to serve gateway
+ * functionality.
*/
-static int cegw_thread_start( void* data )
+static long cegw_ioctl_start(struct file *file, unsigned long arg)
{
- struct sockaddr_in udp_addr;
- struct sockaddr_can can_addr;
- struct cegw_setting* set;
-
- set = (struct cegw_setting*)data;
-
- can_addr.can_family = AF_CAN;
- can_addr.can_ifindex = 0;
-
- udp_addr.sin_family = AF_INET;
- udp_addr.sin_port = htons( set->eth_port );
- udp_addr.sin_addr = set->eth_ip;
-
- kfree( set );
- mutex_lock( &cegw_mutex );
- if( cegw_state == CEGW_EXIT )
- return -1;
- /* stops threads if exist */
- cegw_thread_stop();
-
- /* create and bind sockets */
- if( sock_create_kern( PF_INET, SOCK_DGRAM, IPPROTO_UDP, &udp_sock) != 0 )
- {
- printk( KERN_ERR "canethgw: udp socket creation failed\n" );
- return -1;
+ int i;
+ int err = 0;
+ __u32 dstcnt = 0;
+ __u32 addrlen = 0;
+ struct cegw_ioctl gwctl;
+ struct cegw_job *job = NULL;
+
+ err = copy_from_user(&gwctl, (void __user *)arg, sizeof(gwctl));
+ if (err != 0)
+ return -EFAULT;
+
+ dstcnt = gwctl.udp_dstcnt;
+ addrlen = gwctl.udp_addrlen;
+
+ if (addrlen != sizeof(struct sockaddr_in))
+ return -EAFNOSUPPORT;
+
+ /* */
+ job = kmalloc(GFP_KERNEL, sizeof(*job) + dstcnt*addrlen );
+ if (job == NULL)
+ return -ENOMEM;
+
+ err = copy_from_user(&job->udp_dst, (void __user *)(arg + sizeof(struct cegw_ioctl)), dstcnt*addrlen);
+ if (err != 0) {
+ kfree(job);
+ return -EFAULT;
}
- if( sock_create_kern( PF_CAN, SOCK_RAW, CAN_RAW, &can_sock) != 0 )
- {
- printk( KERN_ERR "canethgw: can socket creation failed\n" );
- return -1;
+ for (i=0; i<dstcnt; i++) {
+ if (job->udp_dst[i].sin_family != AF_INET) {
+ kfree(job);
+ return -EAFNOSUPPORT;
+ }
}
- if( kernel_bind( udp_sock, (struct sockaddr*)&udp_addr, sizeof( udp_addr ) ) != 0 )
- {
- printk( KERN_ERR "canethgw: udp socket binding failed\n" );
- sock_release( udp_sock );
- sock_release( can_sock );
- return -1;
+ job->udp_sock = sockfd_lookup(gwctl.udp_sock, &err);
+ if (job->udp_sock == NULL) {
+ kfree(job);
+ return err;
}
- if( kernel_bind( can_sock, (struct sockaddr*) &can_addr, sizeof(can_addr) ) != 0 )
- {
- printk( KERN_ERR "canethgw: can socket binding failed\n" );
- kernel_sock_shutdown( udp_sock, SHUT_RDWR );
- sock_release( udp_sock );
- sock_release( can_sock );
- return -1;
+ job->can_sock = sockfd_lookup(gwctl.can_sock, &err);
+ if (job->can_sock == NULL) {
+ fput(job->udp_sock->file);
+ kfree(job);
+ return err;
}
- /* start threads */
- cegw_state = CEGW_RUN;
-
- eth_to_can = kthread_create( cegw_udp_can, NULL, "canethgw" );
- if( IS_ERR( eth_to_can ) )
- {
- cegw_state = CEGW_STOP;
- sock_release( udp_sock );
- sock_release( can_sock );
- return -1;
- }
- get_task_struct( eth_to_can );
- wake_up_process( eth_to_can );
-
- can_to_eth = kthread_create( cegw_can_udp, NULL, "canethgw" );
- if( IS_ERR( can_to_eth ) )
- {
- cegw_state = CEGW_STOP;
- kernel_sock_shutdown( udp_sock, SHUT_RDWR );
- kthread_stop( eth_to_can );
- sock_release( udp_sock );
- sock_release( can_sock );
- return -1;
- }
- /* ToDo: free this? */
- get_task_struct( can_to_eth );
- wake_up_process( can_to_eth );
-
- mutex_unlock( &cegw_mutex );
- pr_devel( "threads are running\n" );
+ job->udp_dstcnt = dstcnt;
+
+ err = cegw_thread_start(job);
+ if (err != 0)
+ return err;
+
+ file->private_data = job;
return 0;
}
-/**
- * cegw_thread_stop
- * Waits for threads to stop. Does nothing if cegw_state == CEGW_STOP.
- *
- * @return 0
- */
-static int cegw_thread_stop( void )
+static long cegw_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
- int how = SHUT_RDWR;
- struct sock* sk = NULL;
-
- if( cegw_state == CEGW_STOP )
- return 0;
+ int err;
- cegw_state = CEGW_STOP;
- /* shut down socket */
- sk = can_sock->sk;
- how++;
- lock_sock( sk );
- sk->sk_shutdown |= how;
- sk->sk_state_change( sk );
- release_sock( sk );
+ switch (cmd) {
+ case CEGW_IOCTL_START:
+ err = cegw_ioctl_start(file, arg);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ break;
+ }
- kernel_sock_shutdown( udp_sock, SHUT_RDWR );
+ return err;
+}
- /* wait for return to reuse port if restart */
- kthread_stop( eth_to_can );
- kthread_stop( can_to_eth );
- sock_release( udp_sock );
- sock_release( can_sock );
- can_to_eth = NULL;
- eth_to_can = NULL;
+static const struct file_operations cegw_fops = {
+ .owner = THIS_MODULE,
+ .open = cegw_open,
+ .release = cegw_release,
+ .unlocked_ioctl = cegw_ioctl
+};
- return 0;
-}
+static struct miscdevice cegw_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "canethgw",
+ .fops = &cegw_fops
+};
-static int __init cegw_init( void )
+static int __init cegw_init(void)
{
- notifier.notifier_call = cegw_notifier;
- register_netdevice_notifier( ¬ifier );
-
- /* subscribe to netlink */
- rtnl_register( PF_CAN, RTM_GETROUTE, NULL, cegw_getroute, NULL );
- rtnl_register( PF_CAN, RTM_NEWROUTE, cegw_newroute, NULL, NULL );
- rtnl_register( PF_CAN, RTM_DELROUTE, cegw_delroute, NULL, NULL );
+ misc_register(&cegw_device);
return 0;
}
-static void __exit cegw_exit( void )
+static void __exit cegw_exit(void)
{
- /* ToDo: effect on cangw? */
- rtnl_unregister_all( PF_CAN );
-
- /* wait for rtnl callbacks */
- rtnl_lock();
- rtnl_unlock();
-
- mutex_lock( &cegw_mutex );
- cegw_thread_stop();
- cegw_state = CEGW_EXIT;
- mutex_unlock( &cegw_mutex );
+ misc_deregister(&cegw_device);
- unregister_netdevice_notifier( ¬ifier );
- cegw_flush();
+ return;
}
-module_init( cegw_init );
-module_exit( cegw_exit );
+module_init(cegw_init);
+module_exit(cegw_exit);
projects / can-eth-gw.git / blobdiff