iptables/SOURCES/0011-xtables-translate-Fix-for-iface.patch
2021-09-09 19:13:56 +00:00

61 lines
2.2 KiB
Diff

From 1e1fda9ac0a809c64fd13b4fb759becac824809e Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Thu, 13 Feb 2020 14:01:50 +0100
Subject: [PATCH] xtables-translate: Fix for iface++
In legacy iptables, only the last plus sign remains special, any
previous ones are taken literally. Therefore xtables-translate must not
replace all of them with asterisk but just the last one.
Fixes: e179e87a1179e ("xtables-translate: Fix for interface name corner-cases")
Signed-off-by: Phil Sutter <phil@nwl.cc>
(cherry picked from commit 94488d4eb912f5af4c88d148b39b38eb8a3c1f0b)
Signed-off-by: Phil Sutter <psutter@redhat.com>
---
extensions/generic.txlate | 4 ++++
iptables/xtables-translate.c | 6 +++---
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/extensions/generic.txlate b/extensions/generic.txlate
index c92d082abea78..0e256c3727559 100644
--- a/extensions/generic.txlate
+++ b/extensions/generic.txlate
@@ -23,6 +23,10 @@ nft insert rule bridge filter INPUT ether type 0x800 ether daddr 01:02:03:04:00:
iptables-translate -A FORWARD -i '*' -o 'eth*foo'
nft add rule ip filter FORWARD iifname "\*" oifname "eth\*foo" counter
+# escape all asterisks but translate only the first plus character
+iptables-translate -A FORWARD -i 'eth*foo*+' -o 'eth++'
+nft add rule ip filter FORWARD iifname "eth\*foo\**" oifname "eth+*" counter
+
# skip for always matching interface names
iptables-translate -A FORWARD -i '+'
nft add rule ip filter FORWARD counter
diff --git a/iptables/xtables-translate.c b/iptables/xtables-translate.c
index c4e177c0d63ba..0f95855b41aa4 100644
--- a/iptables/xtables-translate.c
+++ b/iptables/xtables-translate.c
@@ -40,9 +40,6 @@ void xlate_ifname(struct xt_xlate *xl, const char *nftmeta, const char *ifname,
for (i = 0, j = 0; i < ifaclen + 1; i++, j++) {
switch (ifname[i]) {
- case '+':
- iface[j] = '*';
- break;
case '*':
iface[j++] = '\\';
/* fall through */
@@ -65,6 +62,9 @@ void xlate_ifname(struct xt_xlate *xl, const char *nftmeta, const char *ifname,
invert = false;
}
+ if (iface[j - 2] == '+')
+ iface[j - 2] = '*';
+
xt_xlate_add(xl, "%s %s\"%s\" ", nftmeta, invert ? "!= " : "", iface);
}
--
2.24.1