can: initial support for network namespaces
This patch adds initial support for network namespaces. The changes only
enable support in the CAN raw, proc and af_can code. GW and BCM still
have their checks that ensure that they are used only from the main
namespace.
The patch boils down to moving the global structures, i.e. the global
filter list and their /proc stats, into a per-namespace structure and passing
around the corresponding "struct net" in a lot of different places.
Changes since v1:
- rebased on current HEAD (2bfe01e)
- fixed overlong line
Signed-off-by: Mario Kicherer <dev@kicherer.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/include/linux/can/core.h b/include/linux/can/core.h
index df08a41..319a0da 100644
--- a/include/linux/can/core.h
+++ b/include/linux/can/core.h
@@ -45,12 +45,13 @@ struct can_proto {
extern int can_proto_register(const struct can_proto *cp);
extern void can_proto_unregister(const struct can_proto *cp);
-int can_rx_register(struct net_device *dev, canid_t can_id, canid_t mask,
+int can_rx_register(struct net *net, struct net_device *dev,
+ canid_t can_id, canid_t mask,
void (*func)(struct sk_buff *, void *),
void *data, char *ident, struct sock *sk);
-extern void can_rx_unregister(struct net_device *dev, canid_t can_id,
- canid_t mask,
+extern void can_rx_unregister(struct net *net, struct net_device *dev,
+ canid_t can_id, canid_t mask,
void (*func)(struct sk_buff *, void *),
void *data);
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index af8fe8a..fe80bb4 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -27,6 +27,7 @@
#include <net/netns/nftables.h>
#include <net/netns/xfrm.h>
#include <net/netns/mpls.h>
+#include <net/netns/can.h>
#include <linux/ns_common.h>
#include <linux/idr.h>
#include <linux/skbuff.h>
@@ -141,6 +142,9 @@ struct net {
#if IS_ENABLED(CONFIG_MPLS)
struct netns_mpls mpls;
#endif
+#if IS_ENABLED(CONFIG_CAN)
+ struct netns_can can;
+#endif
struct sock *diag_nlsk;
atomic_t fnhe_genid;
};
diff --git a/include/net/netns/can.h b/include/net/netns/can.h
new file mode 100644
index 0000000..e8beba7
--- /dev/null
+++ b/include/net/netns/can.h
@@ -0,0 +1,31 @@
+/*
+ * can in net namespaces
+ */
+
+#ifndef __NETNS_CAN_H__
+#define __NETNS_CAN_H__
+
+#include <linux/spinlock.h>
+
+struct dev_rcv_lists;
+
+struct netns_can {
+#if IS_ENABLED(CONFIG_PROC_FS)
+ struct proc_dir_entry *proc_dir;
+ struct proc_dir_entry *pde_version;
+ struct proc_dir_entry *pde_stats;
+ struct proc_dir_entry *pde_reset_stats;
+ struct proc_dir_entry *pde_rcvlist_all;
+ struct proc_dir_entry *pde_rcvlist_fil;
+ struct proc_dir_entry *pde_rcvlist_inv;
+ struct proc_dir_entry *pde_rcvlist_sff;
+ struct proc_dir_entry *pde_rcvlist_eff;
+ struct proc_dir_entry *pde_rcvlist_err;
+#endif
+
+ /* receive filters subscribed for 'all' CAN devices */
+ struct dev_rcv_lists *can_rx_alldev_list;
+ spinlock_t can_rcvlists_lock;
+};
+
+#endif /* __NETNS_CAN_H__ */