51 lines
2.0 KiB
Diff
51 lines
2.0 KiB
Diff
From 6177d53b1b5748d64eba68b42b173427815e454f Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Fri, 3 Feb 2023 18:58:36 +0100
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Subject: [PATCH] extensions: libebt_ip: Do not use 'ip dscp' for translation
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Converting from TOS field match to DSCP one is irreversible, so replay
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testing is not possible. Use a raw payload expression to produce
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something that translates 1:1 back into an 'ip' match.
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Fixes: 03ecffe6c2cc0 ("ebtables-compat: add initial translations")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 744c56bda974caaa274318d2825b3e43b55bf145)
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---
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extensions/libebt_ip.c | 4 ++--
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extensions/libebt_ip.txlate | 2 +-
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2 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/extensions/libebt_ip.c b/extensions/libebt_ip.c
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index fd87dae7e2c62..8b381aa10b5b7 100644
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--- a/extensions/libebt_ip.c
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+++ b/extensions/libebt_ip.c
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@@ -442,10 +442,10 @@ static int brip_xlate(struct xt_xlate *xl,
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brip_xlate_nh(xl, info, EBT_IP_DEST);
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if (info->bitmask & EBT_IP_TOS) {
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- xt_xlate_add(xl, "ip dscp ");
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+ xt_xlate_add(xl, "@nh,8,8 ");
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if (info->invflags & EBT_IP_TOS)
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xt_xlate_add(xl, "!= ");
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- xt_xlate_add(xl, "0x%02x ", info->tos & 0x3f); /* remove ECN bits */
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+ xt_xlate_add(xl, "0x%02x ", info->tos);
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}
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if (info->bitmask & EBT_IP_PROTO) {
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struct protoent *pe;
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diff --git a/extensions/libebt_ip.txlate b/extensions/libebt_ip.txlate
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index 75c1db246fb81..562e3157d7b92 100644
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--- a/extensions/libebt_ip.txlate
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+++ b/extensions/libebt_ip.txlate
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@@ -5,7 +5,7 @@ ebtables-translate -I FORWARD -p ip --ip-dst 10.0.0.1
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nft 'insert rule bridge filter FORWARD ip daddr 10.0.0.1 counter'
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ebtables-translate -I OUTPUT 3 -p ip -o eth0 --ip-tos 0xff
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-nft 'insert rule bridge filter OUTPUT oifname "eth0" ip dscp 0x3f counter'
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+nft 'insert rule bridge filter OUTPUT oifname "eth0" @nh,8,8 0xff counter'
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ebtables-translate -A FORWARD -p ip --ip-proto tcp --ip-dport 22
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nft 'add rule bridge filter FORWARD tcp dport 22 counter'
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--
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2.40.0
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