[PATCH] extensions: libip6t_REJECT: Avoid to print the default reject with value in the translation

[Laura Garcia Liebana]

Avoid to print the reject with value in the translation when the value
is the default.

Before this patch:

$ sudo ip6tables-translate -A FORWARD -p TCP --dport 22 -j REJECT
nft add rule ip6 filter FORWARD tcp dport 22 counter reject with icmpv6 type 
port-unreachable

After this patch:

$ sudo ip6tables-translate -A FORWARD -p TCP --dport 22 -j REJECT
nft add rule ip6 filter FORWARD tcp dport 22 counter reject

Signed-off-by: Laura Garcia Liebana <nev...@gmail.com>
---
 extensions/libip6t_REJECT.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/extensions/libip6t_REJECT.c b/extensions/libip6t_REJECT.c
index c30f292..d54c3b2 100644
--- a/extensions/libip6t_REJECT.c
+++ b/extensions/libip6t_REJECT.c
@@ -10,6 +10,8 @@
 #include <xtables.h>
 #include <linux/netfilter_ipv6/ip6t_REJECT.h>
 
+#define DEFAULT_REJECT_WITH    IP6T_ICMP6_PORT_UNREACH
+
 struct reject_names {
        const char *name;
        const char *alias;
@@ -81,7 +83,7 @@ static void REJECT_init(struct xt_entry_target *t)
        struct ip6t_reject_info *reject = (struct ip6t_reject_info *)t->data;
 
        /* default */
-       reject->with = IP6T_ICMP6_PORT_UNREACH;
+       reject->with = DEFAULT_REJECT_WITH;
 
 }
 
@@ -149,7 +151,10 @@ static int REJECT_xlate(const void *ip, const struct 
xt_entry_target *target,
        for (i = 0; i < ARRAY_SIZE(reject_table_xlate); ++i)
                if (reject_table_xlate[i].with == reject->with)
                        break;
-       if (reject->with == IP6T_TCP_RESET)
+
+       if (reject->with == DEFAULT_REJECT_WITH)
+               xt_xlate_add(xl, "reject");
+       else if (reject->with == IP6T_TCP_RESET)
                xt_xlate_add(xl, "reject with %s", reject_table_xlate[i].name);
        else
                xt_xlate_add(xl, "reject with icmpv6 type %s",
-- 
2.7.0

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