Lock down the network interface queues. The queue mutex must be obtained

before adding/removing packets from the queue.  Also, the if_obytes and
if_omcasts fields should only be manipulated under protection of the mutex.

IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on
the queue.  An IF_LOCK macro is provided, as well as the old (mutex-less)
versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which
needs them, but their use is discouraged.

Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF,
which takes care of locking/enqueue, and also statistics updating/start
if necessary.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/netnatm/natm_proto.c b/sys/netnatm/natm_proto.c
index 2a37a37..ef657f1 100644
--- a/sys/netnatm/natm_proto.c
+++ b/sys/netnatm/natm_proto.c
@@ -123,6 +123,8 @@ void natm_init()
   LIST_INIT(&natm_pcbs);
   bzero(&natmintrq, sizeof(natmintrq));
   natmintrq.ifq_maxlen = natmqmaxlen;
+  mtx_init(&natmintrq.ifq_mtx, "natm_inq", MTX_DEF);
+
 }
 
 #if defined(__FreeBSD__)