+#define DEBUG
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.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 <net/sock.h>
#include "canethgw.h"
-
-/**
- * ToDo
- * [ ] check every input
- * [ ] refactor
- */
-
-MODULE_LICENSE( "GPL" );
-
-static int gw_udp_recv( void* data );
-static void gw_udp_send( struct can_frame* cf, struct in_addr ipaddr, u16 port );
-static int gw_can_recv( void* data );
-static void gw_can_send( struct can_frame* cf, int ifidx );
-static int listen( int can_ifidx, struct in_addr eth_addr, u16 eth_port );
-
-#define CEGW_STOPPED 0
-#define CEGW_RUNNING 1
-
-static struct task_struct* eth_to_can, * can_to_eth;
-static struct socket* udp_sock = NULL;
-static struct socket* can_sock = NULL;
-static int gw_state = CEGW_STOPPED;
-
-struct can_eth_gw
+#include <linux/completion.h>
+#include <linux/mutex.h>
+#include <net/inet_common.h>
+
+MODULE_LICENSE("GPL");
+
+static int cegw_udp_can(void *data);
+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);
+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
{
- int src_if_idx;
- struct in_addr dst_addr;
- unsigned short dst_port;
- struct hlist_node list;
+ CEGW_RUN,
+ CEGW_STOP,
+ CEGW_EXIT
};
-struct eth_can_gw
+struct cegw_rule
{
- int dst_if_idx;
+ int can_ifindex;
+ struct in_addr eth_ip;
+ unsigned short eth_port;
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;
+ struct in_addr eth_ip;
+ unsigned short eth_port;
};
-/***********************
- * UDP
- ***********************/
+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;
+
+HLIST_HEAD(rule_can_eth);
+HLIST_HEAD(rule_eth_can);
+DEFINE_MUTEX(cegw_mutex);
-static int gw_udp_recv( void* data )
+static void cegw_udp_send(struct socket *udp_sock, struct can_frame *cf,
+ struct in_addr ipaddr, u16 port)
{
- struct can_frame cf;
- struct kvec vec;
struct msghdr mh;
- struct eth_can_gw* job;
- struct hlist_node* pos;
- int can_ifidx;
+ struct sockaddr_in addr;
+ struct kvec vec;
- vec.iov_base = &cf;
- vec.iov_len = sizeof(cf);
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ addr.sin_addr = ipaddr;
- mh.msg_name = NULL;
- mh.msg_namelen = 0;
- mh.msg_iov = NULL;
- mh.msg_iovlen = 0;
+ mh.msg_name = &addr;
+ mh.msg_namelen = sizeof(addr);
mh.msg_control = NULL;
mh.msg_controllen = 0;
mh.msg_flags = 0;
- while( 1 )
- {
- if( kthread_should_stop() ) /* up() ?, recv is blocking */
- break;
- kernel_recvmsg( udp_sock, &mh, &vec, 1, sizeof(cf), 0 ); /* todo: handle error */
- printk( "received udp msg_id:%d\n", cf.can_id );
- hlist_for_each_entry_rcu( job, pos, ð_can_job, list )
- {
- rcu_read_lock(); /**/
- can_ifidx = job->dst_if_idx;
- rcu_read_unlock();
- /* ToDo from filter */
- gw_can_send( &cf, can_ifidx );
- }
- }
+ vec.iov_base = cf;
+ vec.iov_len = sizeof(*cf);
- return 0;
+ kernel_sendmsg(udp_sock, &mh, &vec, 1, sizeof(*cf));
}
-inline static void gw_udp_send( struct can_frame* cf, struct in_addr ipaddr, u16 port )
+static void cegw_can_send(struct socket* can_sock, struct can_frame* cf,
+ int ifindex)
{
struct msghdr mh;
- struct sockaddr_in addr;
struct kvec vec;
-
- addr.sin_family = AF_INET;
- addr.sin_port = htons( port );
- addr.sin_addr = ipaddr;
-
+ struct sockaddr_can addr;
+
+ addr.can_family = AF_CAN;
+ addr.can_ifindex = ifindex;
+
mh.msg_name = &addr;
- mh.msg_namelen = sizeof( 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);
-/***********************
- * CAN
- ***********************/
+ kernel_sendmsg(can_sock, &mh, &vec, 1, sizeof(*cf));
+}
-static int gw_can_recv( void* data )
+/**
+ * cegw_udp_can - performs udp->can routing
+ *
+ * This function is run as a thread.
+ */
+static int cegw_udp_can(void *data)
{
- struct msghdr mh;
- struct kvec vec;
struct can_frame cf;
- struct sockaddr_can ca;
- struct can_eth_gw* job;
+ struct kvec vec;
+ struct msghdr mh;
+ struct cegw_rule* rule;
struct hlist_node* pos;
- struct in_addr eth_addr;
- u16 eth_port;
-
- mh.msg_name = &ca;
- mh.msg_namelen = sizeof( ca );
+ int can_ifidx;
+ int recv_size;
+
+ 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;
-
- vec.iov_base = &cf;
- vec.iov_len = sizeof( cf );
- while( 1 )
- {
- if( kthread_should_stop() ) /**/
+ while (1) {
+ if (cegw_state == CEGW_STOP)
break;
- kernel_recvmsg( can_sock, &mh, &vec, 1, sizeof( cf ), 0 );
- printk( "received can msg_id:%d, from:%d\n", cf.can_id, ca.can_ifindex );
- hlist_for_each_entry_rcu( job, pos, &can_eth_job, list )
- {
+ 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;
+
+ hlist_for_each_entry_rcu(rule, pos, &rule_eth_can, list) {
rcu_read_lock();
- eth_addr = job->dst_addr;
- eth_port = job->dst_port;
+ can_ifidx = rule->can_ifindex;
rcu_read_unlock();
- printk( KERN_INFO "%x\n", eth_addr );
- if( job->src_if_idx == ca.can_ifindex )
- gw_udp_send( &cf, eth_addr, eth_port );
+ /* ToDo: from filter */
+ cegw_can_send(can_sock, &cf, can_ifidx);
}
}
-
+
return 0;
}
-inline static void gw_can_send( struct can_frame* cf, int ifidx )
+/**
+ * cegw_can_udp - performs can->udp routing
+ */
+static int cegw_can_udp(void* data)
{
struct msghdr mh;
struct kvec vec;
- struct sockaddr_can ca =
- {
- .can_family = AF_CAN,
- .can_ifindex = ifidx
- };
-
+ 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_namelen = sizeof(ca);
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 ) );
-}
-/* NetLink */
+ while (1) {
+ if (cegw_state == CEGW_STOP)
+ break;
+ 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;
+
+ hlist_for_each_entry_rcu(rule, pos, &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);
+ }
+ }
+
+ return 0;
+}
-static int cegw_create_job( struct sk_buff* skb, struct nlmsghdr* nlh, void* arg )
+static int cegw_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
- struct nlattr* tb[ CGW_MAX+1 ];
- struct rtcanmsg *r;
- struct can_eth_gw* cethgw = NULL;
- struct eth_can_gw* ecangw = NULL;
+ 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;
r = nlmsg_data(nlh);
- if (r->can_family != AF_CAN)
+
+ if (r->rtm_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" );
+
+ err = nlmsg_parse(nlh, sizeof(*r), tb, CEGW_MAX, NULL);
+ if (err < 0) {
+ pr_devel("canethgw: nlmsg_parse error\n");
return err;
}
- switch( r->gwtype )
- {
- case CGW_TYPE_CONFIG:
- listen( 0, *(struct in_addr*)nla_data( tb[CGW_LISTEN_IP] ),
- *(u16*)nla_data( tb[CGW_LISTEN_PORT] ) );
- break;
- 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:
- printk( "default" );
- /* ToDo undef operation */
- break;
+ if (tb[CEGW_CMD_INFO] == NULL) {
+ pr_devel("canethgw: CEGW_CMD_INFO is missing in rtmsg\n");
+ return -EINVAL;
+ }
+
+ 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);
+ if (set == NULL)
+ return -ENOMEM;
+ 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)
+ return -ENOMEM;
+
+ rule->can_ifindex = ifindex;
+ rule->eth_ip = ip;
+ rule->eth_port = port;
+
+ hlist_add_head_rcu(&rule->list, &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)
+ return -ENOMEM;
+
+ rule->can_ifindex = ifindex;
+ rule->eth_ip = ip;
+ rule->eth_port = port;
+
+ hlist_add_head_rcu(&rule->list, &rule_eth_can);
+ break;
+ default:
+ pr_devel("canethgw: unknown CEGW_CMD_INFO\n");
+ break;
}
return 0;
}
-static int cegw_remove_job( struct sk_buff* skb, struct nlmsghdr* nlh, void* arg )
+static void cegw_flush(void)
{
- struct rtcanmsg* r;
- struct nlattr* tb[ CGW_MAX+1 ];
+ struct cegw_rule *rule;
+ struct hlist_node *pos, *n;
- if( nlmsg_len(nlh) < sizeof(*r) )
+ hlist_for_each_entry_safe(rule, pos, n, &rule_can_eth, list) {
+ hlist_del(&rule->list);
+ kfree(rule);
+ }
+ hlist_for_each_entry_safe(rule, pos, n, &rule_eth_can, list) {
+ hlist_del(&rule->list);
+ kfree(rule);
+ }
+}
+
+static int cegw_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ 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->can_family != AF_CAN )
+ r = nlmsg_data(nlh);
+
+ if (r->rtm_family != AF_CAN)
return -EPFNOSUPPORT;
- if( r->gwtype != CGW_TYPE_CAN_ETH_UDP )
+ err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, CEGW_MAX, NULL);
+ if (err != 0)
return -EINVAL;
- printk( "flags:%x",r->flags );
- //nlmsg_parse( nlh, sizeof(*r), tb, CGW_MAX, NULL );
+ 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;
+ }
+
+ cegw_flush();
- // tb[]
return 0;
}
-static int listen( int can_ifidx, struct in_addr eth_addr, u16 eth_port )
+static int cegw_put_rule(struct sk_buff *skb, int type, struct cegw_rule *rule)
+{
+ 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];
+
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(rule, pos, &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++;
+ }
+
+ hlist_for_each_entry_rcu(rule, pos, &rule_can_eth, list) {
+ if (idx < s_idx)
+ goto cont2;
+
+ if (cegw_put_rule(skb, CEGW_RULE_CAN_ETH, rule) < 0)
+ goto brk;
+cont2:
+ idx++;
+ }
+
+brk:
+ rcu_read_unlock();
+ cb->args[0] = idx;
+
+ return skb->len;
+}
+
+static int cegw_notifier(struct notifier_block *nb, unsigned long msg, void *data)
+{
+ 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, &rule_eth_can, list) {
+ if (rule->can_ifindex == dev->ifindex) {
+ hlist_del(&rule->list);
+ kfree(rule);
+ }
+ }
+
+ hlist_for_each_entry_safe(rule, pos, n, &rule_can_eth, list) {
+ if (rule->can_ifindex == dev->ifindex) {
+ hlist_del(&rule->list);
+ kfree(rule);
+ }
+ }
+ }
+
+ return NOTIFY_DONE;
+}
+
+/**
+ * cegw_thread_start - start working threads
+ * @data: (struct cegw_setting *) with new listening address
+ *
+ * Two threads are started. One is serving udp->can routing and the other
+ * can->udp.
+ */
+static int cegw_thread_start(void *data)
{
struct sockaddr_in udp_addr;
struct sockaddr_can can_addr;
- struct socket* tmp;
+ struct cegw_setting *set;
- printk( KERN_INFO "listen called\n" );
+ set = (struct cegw_setting *)data;
- if( sock_create_kern( PF_INET, SOCK_DGRAM, IPPROTO_UDP, &tmp) != 0 )
- {
- printk( KERN_ERR "error: can_sock creation failed\n" );
+ 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(data);
+ 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;
}
- can_addr.can_family = AF_CAN;
- can_addr.can_ifindex = can_ifidx;
-
- if( can_sock->ops->bind( can_sock, (struct sockaddr*) &can_addr, sizeof(can_addr) ) != 0 )
- {
- printk( KERN_ERR "can_sock bind failed\n" );
+ if (sock_create_kern(PF_CAN, SOCK_RAW, CAN_RAW, &can_sock) != 0) {
+ printk(KERN_ERR "canethgw: can socket creation failed\n");
return -1;
}
-
- printk( KERN_INFO "can socket success\n" );
- udp_addr.sin_family = AF_INET;
- udp_addr.sin_port = htons( eth_port );
- udp_addr.sin_addr = eth_addr;
-
- printk( KERN_INFO "trying to bind\n" );
- if( udp_sock->ops->bind( udp_sock, (struct sockaddr*)&udp_addr, sizeof( udp_addr ) ) != 0 ) /* ref impl ?!? */
- {
- printk( "error: binding failed\n" );
- sock_release( udp_sock );
- sock_release( can_sock );
+ 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;
}
- printk( KERN_INFO "socket established\n" );
-
- /* run threads */
- eth_to_can = kthread_run( gw_udp_recv, NULL, "ethcangw" );
- can_to_eth = kthread_run( gw_can_recv, NULL, "canethgw" );
+ 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;
+ }
- printk( KERN_INFO "threads are running\n" );
+ /* start threads */
+ cegw_state = CEGW_RUN;
- gw_state = CEGW_RUNNING;
+ 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;
+ }
+ get_task_struct(can_to_eth);
+ wake_up_process(can_to_eth);
+ mutex_unlock(&cegw_mutex);
+ pr_devel("threads are running\n");
return 0;
}
-/***********************
- * module init/exit
- ***********************/
+/**
+ * cegw_thread_stop - stops threads and wait for exit
+ *
+ * Waits for threads to stop. Does nothing if cegw_state == CEGW_STOP.
+ */
+static int cegw_thread_stop(void)
+{
+ int how = SHUT_RDWR;
+ struct sock *sk = NULL;
+
+ if (cegw_state == CEGW_STOP)
+ return 0;
+
+ 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);
+
+ kernel_sock_shutdown(udp_sock, SHUT_RDWR);
+
+ /* 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 int __init cangw_init( void )
-{
- if( sock_create_kern( PF_CAN, SOCK_RAW, CAN_RAW, &can_sock) != 0 )
- {
- printk( KERN_ERR "error: can_sock creation failed\n" );
- return -1;
- }
+ return 0;
+}
+
+static int __init cegw_init(void)
+{
+ notifier.notifier_call = cegw_notifier;
+ register_netdevice_notifier(¬ifier);
- if( sock_create_kern( PF_INET, SOCK_DGRAM, IPPROTO_UDP, &udp_sock ) != 0 )
- {
- printk( KERN_ERR "error: udp_sock creation failed\n" );
- sock_release( can_sock );
- return -1;
- }
-
/* subscribe to netlink */
- //if( __rtnl_register( PF_CAN, RTM_GETROUTE, ) != 0 )
- __rtnl_register( PF_CAN, RTM_NEWROUTE, cegw_create_job, NULL, NULL );
- __rtnl_register( PF_CAN, RTM_DELROUTE, cegw_remove_job, NULL, NULL );
- //__rtnl_register( PF_CAN, RTM_DELROUTE, )
-
- /*
- if( sock_create_kern( AF_CAN, SOCK_RAW, CAN_RAW, &can_sock ) != 0 )
- {s
- printk( "error: can_sock creation failed\n" );
- }
- */
-
+ 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);
+
return 0;
}
-static void __exit cangw_exit( void )
+static void __exit cegw_exit(void)
{
- if( gw_state == CEGW_RUNNING )
- {
- sock_release( udp_sock );
- sock_release( can_sock );
- /* ToDo: stop threads */
- }
+ /* 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);
- /* ToDo: unregister netlink */
- printk( "cangw: exit\n" );
- //kthread_stop( ts );
+ unregister_netdevice_notifier(¬ifier);
+ cegw_flush();
}
-module_init( cangw_init );
-module_exit( cangw_exit );
+module_init(cegw_init);
+module_exit(cegw_exit);
projects / can-eth-gw.git / blobdiff