From 676cf8a61ed240d0a86d471ef419f45ba35dba80 Mon Sep 17 00:00:00 2001
From: Denis Ovsienko <infrastation@yandex.ru>
Date: Thu, 5 Dec 2013 14:54:14 +0400
Subject: [PATCH] NFLOG: don't crash trying to filter at link layer
Before:
@ tcpdump -i nflog icmp
tcpdump: WARNING: SIOCGIFADDR: nflog: No such device
Aborted (core dumped)
After:
@ tcpdump -i nflog icmp
tcpdump: WARNING: SIOCGIFADDR: nflog: No such device
tcpdump: NFLOG link-layer type filtering not implemented
---
gencode.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gencode.c b/gencode.c
index 7bb07fb..d58ea30 100644
--- a/gencode.c
+++ b/gencode.c
@@ -3410,6 +3410,13 @@ gen_linktype(proto)
case DLT_AX25_KISS:
bpf_error("AX.25 link-layer type filtering not implemented");
+
+ case DLT_NFLOG:
+ /* Using the fixed-size NFLOG header it is possible to tell only
+ * the address family of the packet, other meaningful data is
+ * either missing or behind TLVs.
+ */
+ bpf_error("NFLOG link-layer type filtering not implemented");
}
/*
--
1.8.3.1