Define four wrapper functions for interface address locking,

if_addr_rlock() and if_addr_runlock() for regular address lists, and
if_maddr_rlock() and if_maddr_runlock() for multicast address lists.

We will use these in various kernel modules to avoid encoding specific
type and locking strategy information into modules that currently use
IF_ADDR_LOCK() and IF_ADDR_UNLOCK() directly.

MFC after:	6 weeks

1 files changed, 34 insertions, 0 deletions

diff --git a/sys/net/if.c b/sys/net/if.c
index 58ab679..c41390a 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1419,6 +1419,40 @@ if_rtdel(struct radix_node *rn, void *arg)
 }
 
 /*
+ * Wrapper functions for struct ifnet address list locking macros.  These are
+ * used by kernel modules to avoid encoding programming interface or binary
+ * interface assumptions that may be violated when kernel-internal locking
+ * approaches change.
+ */
+void
+if_addr_rlock(struct ifnet *ifp)
+{
+
+	IF_ADDR_LOCK(ifp);
+}
+
+void
+if_addr_runlock(struct ifnet *ifp)
+{
+
+	IF_ADDR_UNLOCK(ifp);
+}
+
+void
+if_maddr_rlock(struct ifnet *ifp)
+{
+
+	IF_ADDR_LOCK(ifp);
+}
+
+void
+if_maddr_runlock(struct ifnet *ifp)
+{
+
+	IF_ADDR_UNLOCK(ifp);
+}
+
+/*
  * Reference count functions for ifaddrs.
  */
 void