netsniff-ng: Add netlink dissector

Add an initial implementation of a dissector to work on netlink messages
as received from an nlmon device.

Use can use it as follows to monitor netlink traffic to/from the kernel:

  modprobe nlmon
  ip link add type nlmon
  ip link set nlmon0 up

  netsniff-ng -i nlmon0

  ip link set nlmon 0 down
  ip link del dev nlmon0
  rmmod nlmon

Fixes: #89
Suggested-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 0 deletions

diff --git a/protos.h b/protos.h
index 23bf744..201439a 100644
--- a/protos.h
+++ b/protos.h
@@ -27,5 +27,6 @@ extern struct protocol vlan_ops;
 extern struct protocol ieee80211_ops;
 extern struct protocol QinQ_ops;
 extern struct protocol mpls_uc_ops;
+extern struct protocol nlmsg_ops;
 
 #endif /* PROTOS_H */