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