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>

1 files changed, 7 insertions, 6 deletions

diff --git a/net/can/bcm.c b/net/can/bcm.c
index 95d13b233c65..1976629a8463 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -764,8 +764,8 @@ static void bcm_remove_op(struct bcm_op *op)
 static void bcm_rx_unreg(struct net_device *dev, struct bcm_op *op)
 {
         if (op->rx_reg_dev == dev) {
-                can_rx_unregister(dev, op->can_id, REGMASK(op->can_id),
-                                  bcm_rx_handler, op);
+                can_rx_unregister(&init_net, dev, op->can_id,
+                                  REGMASK(op->can_id), bcm_rx_handler, op);
 
                 /* mark as removed subscription */
                 op->rx_reg_dev = NULL;
@@ -808,7 +808,7 @@ static int bcm_delete_rx_op(struct list_head *ops, struct bcm_msg_head *mh,
                                         }
                                 }
                         } else
-                                can_rx_unregister(NULL, op->can_id,
+                                can_rx_unregister(&init_net, NULL, op->can_id,
                                                   REGMASK(op->can_id),
                                                   bcm_rx_handler, op);
 
@@ -1222,7 +1222,8 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
 
                         dev = dev_get_by_index(&init_net, ifindex);
                         if (dev) {
-                                err = can_rx_register(dev, op->can_id,
+                                err = can_rx_register(&init_net, dev,
+                                                      op->can_id,
                                                       REGMASK(op->can_id),
                                                       bcm_rx_handler, op,
                                                       "bcm", sk);
@@ -1232,7 +1233,7 @@ static int bcm_rx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
                         }
 
                 } else
-                        err = can_rx_register(NULL, op->can_id,
+                        err = can_rx_register(&init_net, NULL, op->can_id,
                                               REGMASK(op->can_id),
                                               bcm_rx_handler, op, "bcm", sk);
                 if (err) {
@@ -1528,7 +1529,7 @@ static int bcm_release(struct socket *sock)
                                 }
                         }
                 } else
-                        can_rx_unregister(NULL, op->can_id,
+                        can_rx_unregister(&init_net, NULL, op->can_id,
                                           REGMASK(op->can_id),
                                           bcm_rx_handler, op);