@@ -252,6 +252,58 @@ static void SNAT_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, ":");
+ 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 SNAT_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;
+ bool sep_need = false;
+ const char *sep = " ";
+
+ for (i = 0; i < info->mr.rangesize; i++) {
+ xt_buf_add(buf, "snat ");
+ print_range_xlate(&info->mr.range[i], buf);
+ if (info->mr.range[i].flags & NF_NAT_RANGE_PROTO_RANDOM) {
+ xt_buf_add(buf, " random");
+ sep_need = true;
+ }
+ if (info->mr.range[i].flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) {
+ if (sep_need)
+ sep = ",";
+ xt_buf_add(buf, "%sfully-random", sep);
+ sep_need = true;
+ }
+ if (info->mr.range[i].flags & NF_NAT_RANGE_PERSISTENT) {
+ if (sep_need)
+ sep = ",";
+ xt_buf_add(buf, "%spersistent", sep);
+ }
+ }
+
+ return 1;
+}
+
static struct xtables_target snat_tg_reg = {
.name = "SNAT",
.version = XTABLES_VERSION,
@@ -264,6 +316,7 @@ static struct xtables_target snat_tg_reg = {
.print = SNAT_print,
.save = SNAT_save,
.x6_options = SNAT_opts,
+ .xlate = SNAT_xlate,
};
void _init(void)
Add translation for target SNAT to nftables. Examples: $ sudo iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 nft add rule ip nat postrouting oifname eth0 counter snat 1.2.3.4 $ sudo iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4-1.2.3.6 nft add rule ip nat postrouting oifname eth0 counter snat 1.2.3.4-1.2.3.6 $ sudo iptables-translate -t nat -A postrouting -p tcp -o eth0 -j SNAT --to 1.2.3.4:1-1023 nft add rule ip nat postrouting oifname eth0 ip protocol tcp counter snat 1.2.3.4:1-1023 $ sudo iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random nft add rule ip nat postrouting oifname eth0 counter snat 1.2.3.4 random $ sudo iptables-translate -t nat -A postrouting -o eth0 -j SNAT --to 1.2.3.4 --random --persistent nft add rule ip nat postrouting oifname eth0 counter snat 1.2.3.4 random,persistent Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com> --- extensions/libipt_SNAT.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)