net: netlink: virtual tap device management
Similarly to the networking receive path with ptype_all taps, we add
the possibility to register netdevices that are for ARPHRD_NETLINK to
the netlink subsystem, so that those can be used for netlink analyzers
resp. debuggers. We do not offer a direct callback function as out-of-tree
modules could do crap with it. Instead, a netdevice must be registered
properly and only receives a clone, managed by the netlink layer. Symbols
are exported as GPL-only.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index f78b430..86fde81a 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -145,4 +145,14 @@
return __netlink_dump_start(ssk, skb, nlh, control);
}
+struct netlink_tap {
+ struct net_device *dev;
+ struct module *module;
+ struct list_head list;
+};
+
+extern int netlink_add_tap(struct netlink_tap *nt);
+extern int __netlink_remove_tap(struct netlink_tap *nt);
+extern int netlink_remove_tap(struct netlink_tap *nt);
+
#endif /* __LINUX_NETLINK_H */