From 861155bef2343e0259469dc8e4acde60e2c6fb91 Mon Sep 17 00:00:00 2001
From: Phil Sutter <psutter@redhat.com>
Date: Wed, 3 Apr 2019 20:29:38 +0200
Subject: [PATCH] extensions: Initialize linear mapping of symbols in _init()
 of extension

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1657075
Upstream Status: iptables commit 56aadc01b258e
Conflicts: Whitespace change due to missing commit f7c26137b0d57
           ("extensions: libipt_realm: Add translation to nft").

commit 56aadc01b258ef7849463723ab5ddc4885db22f6
Author: Serhey Popovych <serhe.popovych@gmail.com>
Date:   Thu Mar 1 13:03:10 2018 +0200

    extensions: Initialize linear mapping of symbols in _init() of extension

    libxt_devgroup and libipt_realm currently unable to display symbolic
    names in save/print commands because linear mapping is not initialized.

    It looks bit confusing as linear mapping initialization is done in init()
    of extension, which is expected to be called before any other function of
    extension.

    However init is called only when '-m' option specified on command line,
    that is true only for insert, append, replace and destroy iptables
    commands.

    Move initialization to extension _init() function before calling
    any function in extension.

    Before:
    -------
    ... src-group 0x1 dst-group 0x2
    ... src-group 0x2 dst-group 0x1

    After:
    ------
    ... src-group grp1 dst-group grp2
    ... src-group grp2 dst-group grp1

    Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
    Signed-off-by: Florian Westphal <fw@strlen.de>

Signed-off-by: Phil Sutter <psutter@redhat.com>
---
 extensions/libipt_realm.c   | 17 +++++++----------
 extensions/libxt_devgroup.c | 17 +++++++----------
 2 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/extensions/libipt_realm.c b/extensions/libipt_realm.c
index a8d9dda0c00c0..fffb1218db7a6 100644
--- a/extensions/libipt_realm.c
+++ b/extensions/libipt_realm.c
@@ -28,17 +28,10 @@ static const struct xt_option_entry realm_opts[] = {
 	XTOPT_TABLEEND,
 };
 
-/* array of realms from /etc/iproute2/rt_realms */
+static const char f_realms[] = "/etc/iproute2/rt_realms";
+/* array of realms from f_realms[] */
 static struct xtables_lmap *realms;
 
-static void realm_init(struct xt_entry_match *m)
-{
-	const char file[] = "/etc/iproute2/rt_realms";
-	realms = xtables_lmap_init(file);
-	if (realms == NULL && errno != ENOENT)
-		fprintf(stderr, "Warning: %s: %s\n", file, strerror(errno));
-}
-
 static void realm_parse(struct xt_option_call *cb)
 {
 	struct xt_realm_info *realminfo = cb->data;
@@ -114,7 +107,6 @@ static struct xtables_match realm_mt_reg = {
 	.size		= XT_ALIGN(sizeof(struct xt_realm_info)),
 	.userspacesize	= XT_ALIGN(sizeof(struct xt_realm_info)),
 	.help		= realm_help,
-	.init		= realm_init,
 	.print		= realm_print,
 	.save		= realm_save,
 	.x6_parse	= realm_parse,
@@ -123,5 +115,10 @@ static struct xtables_match realm_mt_reg = {
 
 void _init(void)
 {
+	realms = xtables_lmap_init(f_realms);
+	if (realms == NULL && errno != ENOENT)
+		fprintf(stderr, "Warning: %s: %s\n", f_realms,
+			strerror(errno));
+
 	xtables_register_match(&realm_mt_reg);
 }
diff --git a/extensions/libxt_devgroup.c b/extensions/libxt_devgroup.c
index fb1fcb51c1bb2..ebfa2aee80cf2 100644
--- a/extensions/libxt_devgroup.c
+++ b/extensions/libxt_devgroup.c
@@ -31,17 +31,10 @@ static const struct xt_option_entry devgroup_opts[] = {
 	XTOPT_TABLEEND,
 };
 
-/* array of devgroups from /etc/iproute2/group */
+static const char f_devgroups[] = "/etc/iproute2/group";
+/* array of devgroups from f_devgroups[] */
 static struct xtables_lmap *devgroups;
 
-static void devgroup_init(struct xt_entry_match *match)
-{
-	const char file[] = "/etc/iproute2/group";
-	devgroups = xtables_lmap_init(file);
-	if (devgroups == NULL && errno != ENOENT)
-		fprintf(stderr, "Warning: %s: %s\n", file, strerror(errno));
-}
-
 static void devgroup_parse_groupspec(const char *arg, unsigned int *group,
 				     unsigned int *mask)
 {
@@ -157,7 +150,6 @@ static struct xtables_match devgroup_mt_reg = {
 	.family		= NFPROTO_UNSPEC,
 	.size		= XT_ALIGN(sizeof(struct xt_devgroup_info)),
 	.userspacesize	= XT_ALIGN(sizeof(struct xt_devgroup_info)),
-	.init		= devgroup_init,
 	.help		= devgroup_help,
 	.print		= devgroup_print,
 	.save		= devgroup_save,
@@ -168,5 +160,10 @@ static struct xtables_match devgroup_mt_reg = {
 
 void _init(void)
 {
+	devgroups = xtables_lmap_init(f_devgroups);
+	if (devgroups == NULL && errno != ENOENT)
+		fprintf(stderr, "Warning: %s: %s\n", f_devgroups,
+			strerror(errno));
+
 	xtables_register_match(&devgroup_mt_reg);
 }
-- 
2.21.0