Fix some long standing bugs in writing to the BPF device attached to

a DLT_NULL interface. In particular:

        1) Consistently use type u_int32_t for the header of a
           DLT_NULL device - it continues to represent the address
           family as always.
        2) In the DLT_NULL case get bpf_movein to store the u_int32_t
           in a sockaddr rather than in the mbuf, to be consistent
           with all the DLT types.
        3) Consequently fix a bug in bpf_movein/bpfwrite which
           only permitted packets up to 4 bytes less than the MTU
           to be written.
        4) Fix all DLT_NULL devices to have the code required to
           allow writing to their bpf devices.
        5) Move the code to allow writing to if_lo from if_simloop
           to looutput, because it only applies to DLT_NULL devices
           but was being applied to other devices that use if_simloop
           possibly incorrectly.

PR:		82157
Submitted by:	Matthew Luckie <mjl@luckie.org.nz>
Approved by:	re (scottl)

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/netgraph/ng_sppp.c b/sys/netgraph/ng_sppp.c
index b46acbb..aeee31d 100644
--- a/sys/netgraph/ng_sppp.c
+++ b/sys/netgraph/ng_sppp.c
@@ -289,7 +289,7 @@ ng_sppp_constructor (node_p node)
 	/* Attach the interface */
 	sppp_attach (ifp);
 	if_attach (ifp);
-	bpfattach (ifp, DLT_NULL, sizeof(u_int));
+	bpfattach (ifp, DLT_NULL, sizeof(u_int32_t));
 
 	/* Done */
 	return (0);