extensions: libipt_DNAT: Add translation to nft
PATCH 1/1 extensions: libipt_DNAT: Add translation to nft
Add translation for target DNAT to nftables.
Examples:
$ sudo iptables-translate -t nat -A prerouting -p tcp -o eth0 -j DNAT --to-destination 1.2.3.4 nft add rule ip nat prerouting oifname eth0 ip protocol tcp counter dnat 1.2.3.4
$ sudo iptables-translate -t nat -A prerouting -p tcp -d 15.45.23.67 --dport 80 -j DNAT --to-destination 192.168.1.1-192.168.1.10 nft add rule ip nat prerouting ip daddr 15.45.23.67 tcp dport 80 counter dnat 192.168.1.1-192.168.1.10
$ sudo iptables-translate -t nat -A prerouting -p tcp -o eth0 -j DNAT --to-destination 1.2.3.4:1-1023 nft add rule ip nat prerouting oifname eth0 ip protocol tcp counter dnat 1.2.3.4:1-1023
$ sudo iptables-translate -t nat -A prerouting -p tcp -o eth0 -j DNAT --to-destination 1.2.3.4 --random nft add rule ip nat prerouting oifname eth0 ip protocol tcp counter dnat 1.2.3.4 random
$ sudo iptables-translate -t nat -A prerouting -p tcp -o eth0 -j DNAT --to-destination 1.2.3.4 --persistent nft add rule ip nat prerouting oifname eth0 ip protocol tcp counter dnat 1.2.3.4 persistent
Signed-off-by Shivani Bhardwaj <[email protected]>
--- extensions/libipt_DNAT.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)
extensions/libipt_DNAT.c +39 -0
@@ -242,6 +242,44 @@ static void DNAT_save(const void *ip, const struct xt_entry_target *target) } } +static void print_range_xlate (const struct nf_nat_ipv4_range *r, +struct xt_buf *buf) +{ +if (r->flags &NF_NAT_RANGE_MAP_IPS ) { +struct in_addr a; + + a.s_addr = r->min_ip; +xt_buf_add (buf,"%s" ,xtables_ipaddr_to_numeric (&a)); +if (r->max_ip != r->min_ip) { + a.s_addr = r->max_ip; +xt_buf_add (buf,"-%s" ,xtables_ipaddr_to_numeric (&a)); + } + } +if (r->flags &NF_NAT_RANGE_PROTO_SPECIFIED ) { +xt_buf_add (buf,":%hu" ,ntohs (r->min.tcp.port)); +if (r->max.tcp.port != r->min.tcp.port) +xt_buf_add (buf,"-%hu" ,ntohs (r->max.tcp.port)); + } +} + +static int DNAT_xlate (const struct xt_entry_target *target, +struct xt_buf *buf,int numeric) +{ +const struct ipt_natinfo *info = (const void *)target; +unsigned int i =0 ; + +for (i =0 ; i < info->mr.rangesize; i++) { +xt_buf_add (buf,"dnat " ); +print_range_xlate (&info->mr.range[i], buf); +if (info->mr.range[i].flags &NF_NAT_RANGE_PROTO_RANDOM ) +xt_buf_add (buf," random" ); +if (info->mr.range[i].flags &NF_NAT_RANGE_PERSISTENT ) +xt_buf_add (buf," persistent" ); + } + +return 1 ; +} +static struct xtables_target dnat_tg_reg = { .name ="DNAT" , .version =XTABLES_VERSION ,
@@ -254,6 +292,7 @@ static struct xtables_target dnat_tg_reg = { .print = DNAT_print, .save = DNAT_save, .x6_options = DNAT_opts, + .xlate = DNAT_xlate, };void _init (void )
Signature · 1 line
1.9.1