iptables/0122-extensions-libebt_ip-Translation-has-to-match-on-eth.patch
Phil Sutter 1c8d6d0d32 iptables-1.8.5-1.el8
- Rebase to version 1.8.5 plus upstream-indicated fixes
- Fix for duplicate files in RPM due to imprecise globbing
- Drop bootstrap code again

Resolves: rhbz#2211063
2023-05-30 14:47:41 +02:00

91 lines
3.3 KiB
Diff

From 3b42685aeedbb81f7dc6af0e1eb35200236449d2 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Fri, 3 Feb 2023 17:37:40 +0100
Subject: [PATCH] extensions: libebt_ip: Translation has to match on ether type
On one hand, nft refuses th expression in bridge family if layer3
protocol has not been assured by a previous match. On the other, ebt_ip
kernel module will only match on IPv4 packets, so there might be a
functional change in the translation versus the original.
Instead of just always emitting an 'ether type' match, decide whether
it's actually needed - explicit "ip <something>" payload matches (or
icmp ones) cause implicit creation of a match on IPv4 by nft.
Fixes: 03ecffe6c2cc0 ("ebtables-compat: add initial translations")
Signed-off-by: Phil Sutter <phil@nwl.cc>
(cherry picked from commit b860e658200af8fdeced2896a1a6c2f0f0692b70)
Conflicts:
extensions/libebt_ip.txlate
-> Adjusted to missing commit 09d63e818ae0d
("extensions: change expected output for new format").
---
extensions/libebt_ip.c | 21 +++++++++++++++++++++
extensions/libebt_ip.txlate | 6 +++---
2 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/extensions/libebt_ip.c b/extensions/libebt_ip.c
index 7b6fa4a2139d4..81500828fe74c 100644
--- a/extensions/libebt_ip.c
+++ b/extensions/libebt_ip.c
@@ -667,6 +667,24 @@ static void brip_xlate_nh(struct xt_xlate *xl,
xtables_ipmask_to_numeric(maskp));
}
+static bool may_skip_ether_type_dep(uint8_t flags)
+{
+ /* these convert to "ip (s|d)addr" matches */
+ if (flags & (EBT_IP_SOURCE | EBT_IP_DEST))
+ return true;
+
+ /* icmp match triggers implicit ether type dependency in nft */
+ if (flags & EBT_IP_ICMP)
+ return true;
+
+ /* allow if "ip protocol" match is created by brip_xlate() */
+ if (flags & EBT_IP_PROTO &&
+ !(flags & (EBT_IP_SPORT | EBT_IP_DPORT | EBT_IP_ICMP)))
+ return true;
+
+ return false;
+}
+
static int brip_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
@@ -676,6 +694,9 @@ static int brip_xlate(struct xt_xlate *xl,
brip_xlate_nh(xl, info, EBT_IP_SOURCE);
brip_xlate_nh(xl, info, EBT_IP_DEST);
+ if (!may_skip_ether_type_dep(info->bitmask))
+ xt_xlate_add(xl, "ether type ip ");
+
if (info->bitmask & EBT_IP_TOS) {
xt_xlate_add(xl, "@nh,8,8 ");
if (info->invflags & EBT_IP_TOS)
diff --git a/extensions/libebt_ip.txlate b/extensions/libebt_ip.txlate
index 5c766e1b743ea..cc42d2dbacf65 100644
--- a/extensions/libebt_ip.txlate
+++ b/extensions/libebt_ip.txlate
@@ -5,13 +5,13 @@ ebtables-translate -I FORWARD -p ip --ip-dst 10.0.0.1
nft insert rule bridge filter FORWARD ip daddr 10.0.0.1 counter
ebtables-translate -I OUTPUT 3 -p ip -o eth0 --ip-tos 0xff
-nft insert rule bridge filter OUTPUT oifname "eth0" @nh,8,8 0xff counter
+nft insert rule bridge filter OUTPUT oifname "eth0" ether type ip @nh,8,8 0xff counter
ebtables-translate -A FORWARD -p ip --ip-proto tcp --ip-dport 22
-nft add rule bridge filter FORWARD tcp dport 22 counter
+nft add rule bridge filter FORWARD ether type ip tcp dport 22 counter
ebtables-translate -A FORWARD -p ip --ip-proto udp --ip-sport 1024:65535
-nft add rule bridge filter FORWARD udp sport 1024-65535 counter
+nft add rule bridge filter FORWARD ether type ip udp sport 1024-65535 counter
ebtables-translate -A FORWARD -p ip --ip-proto 253
nft add rule bridge filter FORWARD ip protocol 253 counter
--
2.40.0