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author | Phil Sutter <phil@nwl.cc> | 2024-01-10 15:26:59 +0100 |
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committer | Phil Sutter <phil@nwl.cc> | 2024-02-07 00:25:03 +0100 |
commit | ff57cd48d2b0c01c1519fd8893fc0432ad211702 (patch) | |
tree | 96e5369c10d314f7b8aca0be375bded16affeb04 /iptables/xtables.pc.in | |
parent | a369c736a7fa88a176dbdb17fd50cf30074f54ab (diff) |
iptables-save: Avoid /etc/protocols lookups
Instrument proto_to_name() to abort if given protocol number is not
among the well-known ones in xtables_chain_protos. Along with
xtables_parse_protocol() preferring said array for lookups as well, this
ensures reliable dump'n'restore regardless of /etc/protocols contents.
Another benefit is rule dump performance. A simple test-case dumping
100k rules matching on dccp protocol shows an 8s delta (2s vs. 10s for
legacy, 0.5s vs. 8s for nft) with this patch applied. For reference:
| for variant in nft legacy; do
| (
| echo "*filter"
| for ((i = 0; i < 100000; i++)); do
| echo "-A FORWARD -p dccp -j ACCEPT"
| done
| echo "COMMIT"
| ) | iptables-${variant}-restore
| time iptables-${variant}-save | wc -l
| iptables-${variant} -F
| done
Signed-off-by: Phil Sutter <phil@nwl.cc>
Diffstat (limited to 'iptables/xtables.pc.in')
0 files changed, 0 insertions, 0 deletions