+#include "gw.h" /* override */
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/net.h>
#include <linux/can/core.h>
#include <linux/can.h>
+#include <net/rtnetlink.h>
#include "canethgw.h"
MODULE_LICENSE( "GPL" );
static struct socket* can_sock;
static struct net_device* can_dev;
+struct can_eth_gw
+{
+ int src_if_idx;
+ struct in_addr dst_addr;
+ unsigned short dst_port;
+ struct hlist_node list;
+};
+
+struct eth_can_gw
+{
+ int dst_if_idx;
+ struct hlist_node list;
+};
+
+HLIST_HEAD( can_eth_job );
+HLIST_HEAD( eth_can_job );
+
+struct cegw_setting
+{
+ struct can_filter filter;
+ int src_idx;
+ /* bind on if */
+ struct in_addr dst_addr;
+ unsigned short dst_port;
+};
+
/***********************
* UDP
***********************/
-int gw_udp_recv( void* data )
+static int gw_udp_recv( void* data )
{
struct can_frame cf;
struct kvec vec;
struct msghdr mh;
+ struct eth_can_gw* job;
+ struct hlist_node* pos;
vec.iov_base = &cf;
vec.iov_len = sizeof(cf);
break;
kernel_recvmsg( udp_sock, &mh, &vec, 1, sizeof(cf), 0 ); /* todo: handle error */
printk( "received udp msg_id:%d\n", cf.can_id );
- gw_can_send( &cf );
+ rcu_read_lock();
+ hlist_for_each_entry_rcu( job, pos, ð_can_job, list )
+ {
+ /* ToDo from filter */
+ gw_can_send( &cf, job->dst_if_idx );
+ }
+ rcu_read_unlock();
}
return 0;
}
-void gw_udp_send( struct can_frame* cf )
+inline static void gw_udp_send( struct can_frame* cf, struct in_addr ipaddr, u16 port )
{
struct msghdr mh;
struct sockaddr_in addr;
struct kvec vec;
addr.sin_family = AF_INET;
- addr.sin_port = htons( 10502 );
- addr.sin_addr.s_addr = 0x0100007f;
+ addr.sin_port = htons( port );
+ addr.sin_addr = ipaddr;
mh.msg_name = &addr;
mh.msg_namelen = sizeof( addr );
* CAN
***********************/
-int gw_can_recv( void* data )
+static int gw_can_recv( void* data )
{
struct msghdr mh;
struct kvec vec;
struct can_frame cf;
+ struct sockaddr_can ca;
+ struct can_eth_gw* job;
+ struct hlist_node* pos;
- mh.msg_name = NULL;
- mh.msg_namelen = 0;
+ mh.msg_name = &ca;
+ mh.msg_namelen = sizeof( ca );
mh.msg_control = NULL;
mh.msg_controllen = 0;
mh.msg_flags = 0;
vec.iov_base = &cf;
vec.iov_len = sizeof( cf );
-
+
while( 1 )
{
if( kthread_should_stop() ) /**/
break;
kernel_recvmsg( can_sock, &mh, &vec, 1, sizeof( cf ), 0 );
- printk( "received can msg_id:%d\n", cf.can_id );
- gw_udp_send( &cf );
+ printk( "received can msg_id:%d, from:%d\n", cf.can_id, ca.can_ifindex );
+ rcu_read_lock();
+ hlist_for_each_entry_rcu( job, pos, &can_eth_job, list )
+ {
+ printk( KERN_INFO "%x\n", job->dst_addr );
+ if( job->src_if_idx == ca.can_ifindex )
+ gw_udp_send( &cf, job->dst_addr, job->dst_port );
+ }
+ rcu_read_unlock();
}
return 0;
}
-void gw_can_send( struct can_frame* cf )
+inline static void gw_can_send( struct can_frame* cf, int ifidx )
{
struct msghdr mh;
- struct kvec vec;
+ struct kvec vec;
+ struct sockaddr_can ca =
+ {
+ .can_family = AF_CAN,
+ .can_ifindex = ifidx
+ };
- mh.msg_name = NULL;
- mh.msg_namelen = 0;
+ mh.msg_name = &ca;
+ mh.msg_namelen = sizeof( ca );
mh.msg_control = NULL;
mh.msg_controllen = 0;
mh.msg_flags = 0;
kernel_sendmsg( can_sock, &mh, &vec, 1, sizeof( *cf ) );
}
+/* NetLink */
+
+static int cgw_create_job( struct sk_buff* skb, struct nlmsghdr* nlh,
+ void* arg )
+{
+ struct nlattr* tb[ CGW_MAX+1 ];
+ struct rtcanmsg *r;
+ struct cgw_job *gwj;
+ struct can_eth_gw* cethgw = NULL;
+ struct eth_can_gw* ecangw = NULL;
+ int err = 0;
+
+ if (nlmsg_len(nlh) < sizeof(*r))
+ return -EINVAL;
+
+ r = nlmsg_data(nlh);
+ if (r->can_family != AF_CAN)
+ return -EPFNOSUPPORT;
+
+ err = nlmsg_parse( nlh, sizeof( struct rtcanmsg ), tb, CGW_MAX, NULL );
+ if( err < 0 )
+ {
+ printk( KERN_ERR "error: nlmsg_parse\n" );
+ return err;
+ }
+
+ /* so far we only support CAN -> CAN routings */
+ switch( r->gwtype )
+ {
+ case CGW_TYPE_CAN_ETH_UDP:
+ printk( KERN_INFO "can:%d\n", *(int*)nla_data( tb[CGW_CAN_IF] ) );
+ printk( KERN_INFO "eth addr:%x\n", *(u32*)nla_data( tb[CGW_ETH_IP] ) );
+ printk( KERN_INFO "eth port:%hu\n", *(u16*)nla_data( tb[CGW_ETH_PORT] ) );
+ cethgw = kmalloc( sizeof(struct can_eth_gw), GFP_KERNEL );
+ if( cethgw == NULL )
+ {
+ printk( KERN_ERR "error: kmalloc\n" );
+ break;
+ }
+ cethgw->src_if_idx = *(int*)nla_data( tb[CGW_CAN_IF] );
+ cethgw->dst_addr = *(struct in_addr*)nla_data( tb[CGW_ETH_IP] );
+ cethgw->dst_port = *(u16*)nla_data( tb[CGW_ETH_PORT] );
+
+ hlist_add_head_rcu( &cethgw->list, &can_eth_job );
+ break;
+ case CGW_TYPE_ETH_CAN_UDP:
+ printk( KERN_INFO "can:%d\n", *(int*)nla_data( tb[CGW_CAN_IF] ) );
+ ecangw = kmalloc( sizeof(struct eth_can_gw), GFP_KERNEL );
+ if( ecangw == NULL )
+ {
+ printk( KERN_ERR "error: kmalloc\n" );
+ break;
+ }
+ ecangw->dst_if_idx = *(int*)nla_data( tb[CGW_CAN_IF] );
+ hlist_add_head_rcu( &ecangw->list, ð_can_job );
+ break;
+ default:
+ /* ToDo undef operation */
+ break;
+ }
+
+ return 0;
+}
+
/***********************
* module init/exit
***********************/
return -1;
}
- /* 3. run bridging threads */
+ /* 3. subscribe to netlink */
+ //if( __rtnl_register( PF_CAN, RTM_GETROUTE, ) != 0 )
+ __rtnl_register( PF_CAN, RTM_NEWROUTE, cgw_create_job, NULL, NULL );
+ //__rtnl_register( PF_CAN, RTM_DELROUTE, )
+
+ /* 4. run threads */
eth_to_can = kthread_run( gw_udp_recv, NULL, "cangw" );
can_to_eth = kthread_run( gw_can_recv, NULL, "cangw" );
module_init( cangw_init );
module_exit( cangw_exit );
+
projects / can-eth-gw.git / blobdiff