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From 3013545255719fcda031c227570c498c4fc7cc35 Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 31 Jan 2019 16:12:55 +0100
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Subject: [PATCH] arptables-nft: Don't print default h-len/h-type values
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Default values for --h-len and --h-type being printed for rules where
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user didn't provide them is unexpected and confusing. The drawback is
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the opposite: If user provided either of them with their default value,
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they are later omitted when listing rules. Though since unlike legacy
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arptables we can't distinguish between not specified and specified with
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default value, we can't fix both - so choose to optimize for the more
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likely case.
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Fixes: 5aecb2d8bfdda ("arptables: pre-init hlen and ethertype")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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(cherry picked from commit 84331e3ed3f8eb9d53c00c221113ad16b209968a)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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iptables/nft-arp.c | 4 +--
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.../arptables/0001-arptables-save-restore_0 | 32 +++++++++----------
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.../0002-arptables-restore-defaults_0 | 6 ++--
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3 files changed, 21 insertions(+), 21 deletions(-)
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diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
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index 2cbdf23214049..37b0985377bef 100644
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--- a/iptables/nft-arp.c
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+++ b/iptables/nft-arp.c
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@@ -537,7 +537,7 @@ after_devsrc:
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after_devdst:
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- if (fw->arp.arhln_mask != 0) {
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+ if (fw->arp.arhln_mask != 255 || fw->arp.arhln != 6) {
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printf("%s%s", sep, fw->arp.invflags & ARPT_INV_ARPHLN
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? "! " : "");
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printf("--h-length %d", fw->arp.arhln);
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@@ -561,7 +561,7 @@ after_devdst:
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sep = " ";
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}
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- if (fw->arp.arhrd_mask != 0) {
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+ if (fw->arp.arhrd_mask != 65535 || fw->arp.arhrd != htons(1)) {
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uint16_t tmp = ntohs(fw->arp.arhrd);
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printf("%s%s", sep, fw->arp.invflags & ARPT_INV_ARPHRD
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diff --git a/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0 b/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
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index 0664e3b38d5e8..e10f61cc8f95b 100755
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--- a/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
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+++ b/iptables/tests/shell/testcases/arptables/0001-arptables-save-restore_0
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@@ -35,22 +35,22 @@ DUMP='*filter
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:INPUT ACCEPT
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:OUTPUT DROP
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:foo -
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--A INPUT -j ACCEPT -s 10.0.0.0/8 --h-length 6 --h-type 1
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--A INPUT -j ACCEPT -d 192.168.123.1 --h-length 6 --h-type 1
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--A INPUT -j ACCEPT --src-mac fe:ed:ba:be:00:01 --h-length 6 --h-type 1
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--A INPUT -j ACCEPT --dst-mac fe:ed:ba:be:00:01 --h-length 6 --h-type 1
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--A INPUT -j foo --h-length 6 --h-type 1
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--A INPUT --h-length 6 --h-type 1
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--A OUTPUT -j ACCEPT -o lo --h-length 6 --h-type 1
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--A OUTPUT -j mangle -o eth134 --h-length 6 --h-type 1 --mangle-ip-s 10.0.0.1
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--A OUTPUT -j CLASSIFY -o eth432 --h-length 6 --h-type 1 --set-class feed:babe
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--A OUTPUT -j CLASSIFY -o eth432 --h-length 6 --opcode 1 --h-type 1 --set-class feed:babe
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--A foo -j ACCEPT -i lo --h-length 6 --h-type 1
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--A foo -j ACCEPT --h-length 6 --h-type 1
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--A foo -j MARK --h-length 6 --h-type 1 --set-mark 12345
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--A foo -j ACCEPT --h-length 6 --opcode 1 --h-type 1
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--A foo -j ACCEPT --h-length 6 --h-type 1 --proto-type 0x800
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--A foo -j ACCEPT -i lo --h-length 6 --opcode 1 --h-type 1 --proto-type 0x800
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+-A INPUT -j ACCEPT -s 10.0.0.0/8
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+-A INPUT -j ACCEPT -d 192.168.123.1
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+-A INPUT -j ACCEPT --src-mac fe:ed:ba:be:00:01
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+-A INPUT -j ACCEPT --dst-mac fe:ed:ba:be:00:01
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+-A INPUT -j foo
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+-A INPUT
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+-A OUTPUT -j ACCEPT -o lo
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+-A OUTPUT -j mangle -o eth134 --mangle-ip-s 10.0.0.1
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+-A OUTPUT -j CLASSIFY -o eth432 --set-class feed:babe
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+-A OUTPUT -j CLASSIFY -o eth432 --opcode 1 --set-class feed:babe
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+-A foo -j ACCEPT -i lo
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+-A foo -j ACCEPT
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+-A foo -j MARK --set-mark 12345
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+-A foo -j ACCEPT --opcode 1
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+-A foo -j ACCEPT --proto-type 0x800
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+-A foo -j ACCEPT -i lo --opcode 1 --proto-type 0x800
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'
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diff -u <(echo -e "$DUMP") <($XT_MULTI arptables-save)
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diff --git a/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0 b/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
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index d742c3d506305..b2ed95e87bb40 100755
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--- a/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
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+++ b/iptables/tests/shell/testcases/arptables/0002-arptables-restore-defaults_0
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@@ -11,7 +11,7 @@ set -e
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DUMP='*filter
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:OUTPUT ACCEPT
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-A OUTPUT -j mangle --mangle-ip-s 10.0.0.1
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--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-d 10.0.0.2
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+-A OUTPUT -j mangle --mangle-ip-d 10.0.0.2
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'
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# note how mangle-ip-s is unset in second rule
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@@ -19,8 +19,8 @@ DUMP='*filter
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EXPECT='*filter
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:INPUT ACCEPT
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:OUTPUT ACCEPT
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--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-s 10.0.0.1
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--A OUTPUT -j mangle --h-length 6 --h-type 1 --mangle-ip-d 10.0.0.2
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+-A OUTPUT -j mangle --mangle-ip-s 10.0.0.1
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+-A OUTPUT -j mangle --mangle-ip-d 10.0.0.2
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'
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$XT_MULTI arptables -F
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--
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2.21.0
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