From 3013545255719fcda031c227570c498c4fc7cc35 Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Thu, 31 Jan 2019 16:12:55 +0100
Subject: [PATCH] arptables-nft: Don't print default h-len/h-type values

Default values for --h-len and --h-type being printed for rules where
user didn't provide them is unexpected and confusing. The drawback is
the opposite: If user provided either of them with their default value,
they are later omitted when listing rules. Though since unlike legacy
arptables we can't distinguish between not specified and specified with
default value, we can't fix both - so choose to optimize for the more
likely case.

Fixes: 5aecb2d8bfdda ("arptables: pre-init hlen and ethertype")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
(cherry picked from commit 84331e3ed3f8eb9d53c00c221113ad16b209968a)
Signed-off-by: Phil Sutter <psutter@redhat.com>
---
 iptables/nft-arp.c                            |  4 +--
 .../arptables/0001-arptables-save-restore_0   | 32 +++++++++----------
 .../0002-arptables-restore-defaults_0         |  6 ++--
 3 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
index 2cbdf23214049..37b0985377bef 100644
--- a/iptables/nft-arp.c
+++ b/iptables/nft-arp.c
@@ -537,7 +537,7 @@ after_devsrc:
 
 after_devdst:
 
-	if (fw->arp.arhln_mask != 0) {
+	if (fw->arp.arhln_mask != 255 || fw->arp.arhln != 6) {
 		printf("%s%s", sep, fw->arp.invflags & ARPT_INV_ARPHLN
 			? "! " : "");
 		printf("--h-length %d", fw->arp.arhln);
@@ -561,7 +561,7 @@ after_devdst:
 		sep = " ";
 	}
 
-	if (fw->arp.arhrd_mask != 0) {
+	if (fw->arp.arhrd_mask != 65535 || fw->arp.arhrd != htons(1)) {
 		uint16_t tmp = ntohs(fw->arp.arhrd);
 
 		printf("%s%s", sep, fw->arp.invflags & ARPT_INV_ARPHRD
diff --git a/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0 b/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
index 0664e3b38d5e8..e10f61cc8f95b 100755
--- a/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
+++ b/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
@@ -35,22 +35,22 @@ DUMP='*filter
 :INPUT ACCEPT
 :OUTPUT DROP
 :foo -
--A INPUT -j ACCEPT -s 10.0.0.0/8 --h-length 6 --h-type 1
--A INPUT -j ACCEPT -d 192.168.123.1 --h-length 6 --h-type 1
--A INPUT -j ACCEPT --src-mac fe:ed:ba:be:00:01 --h-length 6 --h-type 1
--A INPUT -j ACCEPT --dst-mac fe:ed:ba:be:00:01 --h-length 6 --h-type 1
--A INPUT -j foo --h-length 6 --h-type 1
--A INPUT  --h-length 6 --h-type 1
--A OUTPUT -j ACCEPT -o lo --h-length 6 --h-type 1
--A OUTPUT -j mangle -o eth134 --h-length 6 --h-type 1 --mangle-ip-s 10.0.0.1
--A OUTPUT -j CLASSIFY -o eth432 --h-length 6 --h-type 1 --set-class feed:babe
--A OUTPUT -j CLASSIFY -o eth432 --h-length 6 --opcode 1 --h-type 1 --set-class feed:babe
--A foo -j ACCEPT -i lo --h-length 6 --h-type 1
--A foo -j ACCEPT --h-length 6 --h-type 1
--A foo -j MARK --h-length 6 --h-type 1 --set-mark 12345
--A foo -j ACCEPT --h-length 6 --opcode 1 --h-type 1
--A foo -j ACCEPT --h-length 6 --h-type 1 --proto-type 0x800
--A foo -j ACCEPT -i lo --h-length 6 --opcode 1 --h-type 1 --proto-type 0x800
+-A INPUT -j ACCEPT -s 10.0.0.0/8
+-A INPUT -j ACCEPT -d 192.168.123.1
+-A INPUT -j ACCEPT --src-mac fe:ed:ba:be:00:01
+-A INPUT -j ACCEPT --dst-mac fe:ed:ba:be:00:01
+-A INPUT -j foo
+-A INPUT 
+-A OUTPUT -j ACCEPT -o lo
+-A OUTPUT -j mangle -o eth134 --mangle-ip-s 10.0.0.1
+-A OUTPUT -j CLASSIFY -o eth432 --set-class feed:babe
+-A OUTPUT -j CLASSIFY -o eth432 --opcode 1 --set-class feed:babe
+-A foo -j ACCEPT -i lo
+-A foo -j ACCEPT
+-A foo -j MARK --set-mark 12345
+-A foo -j ACCEPT --opcode 1
+-A foo -j ACCEPT --proto-type 0x800
+-A foo -j ACCEPT -i lo --opcode 1 --proto-type 0x800
 '
 
 diff -u <(echo -e "$DUMP") <($XT_MULTI arptables-save)
diff --git a/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0 b/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
index d742c3d506305..b2ed95e87bb40 100755
--- a/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
+++ b/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
@@ -11,7 +11,7 @@ set -e
 DUMP='*filter
 :OUTPUT ACCEPT
 -A OUTPUT -j mangle --mangle-ip-s 10.0.0.1
--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-d 10.0.0.2
+-A OUTPUT -j mangle --mangle-ip-d 10.0.0.2
 '
 
 # note how mangle-ip-s is unset in second rule
@@ -19,8 +19,8 @@ DUMP='*filter
 EXPECT='*filter
 :INPUT ACCEPT
 :OUTPUT ACCEPT
--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-s 10.0.0.1
--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-d 10.0.0.2
+-A OUTPUT -j mangle --mangle-ip-s 10.0.0.1
+-A OUTPUT -j mangle --mangle-ip-d 10.0.0.2
 '
 
 $XT_MULTI arptables -F
-- 
2.21.0