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authorLiping Zhang <zlpnobody@gmail.com>2017-01-22 22:10:32 +0800
committerPablo Neira Ayuso <pablo@netfilter.org>2017-01-24 21:46:29 +0100
commit5ce6b04ce96896e8a79e6f60740ced911eaac7a4 (patch)
treeb975e60eb3ab49d2fc1225abe615238325a61ed5 /include
parentb2fbd04498789def80ceba3d5bbc5af7f2f70a5f (diff)
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netfilter: nft_log: restrict the log prefix length to 127
First, log prefix will be truncated to NF_LOG_PREFIXLEN-1, i.e. 127, at nf_log_packet(), so the extra part is useless. Second, after adding a log rule with a very very long prefix, we will fail to dump the nft rules after this _special_ one, but acctually, they do exist. For example: # name_65000=$(printf "%0.sQ" {1..65000}) # nft add rule filter output log prefix "$name_65000" # nft add rule filter output counter # nft add rule filter output counter # nft list chain filter output table ip filter { chain output { type filter hook output priority 0; policy accept; } } So now, restrict the log prefix length to NF_LOG_PREFIXLEN-1. Fixes: 96518518cc41 ("netfilter: add nftables") Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include')
-rw-r--r--include/uapi/linux/netfilter/nf_log.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/netfilter/nf_log.h b/include/uapi/linux/netfilter/nf_log.h
index 8be21e02387d..d0b5fa91ff54 100644
--- a/include/uapi/linux/netfilter/nf_log.h
+++ b/include/uapi/linux/netfilter/nf_log.h
@@ -9,4 +9,6 @@
#define NF_LOG_MACDECODE 0x20 /* Decode MAC header */
#define NF_LOG_MASK 0x2f
+#define NF_LOG_PREFIXLEN 128
+
#endif /* _NETFILTER_NF_LOG_H */