From d4721236c2e8808958ada3d7b2548f4c473908a0 Mon Sep 17 00:00:00 2001 From: Shivani Bhardwaj Date: Wed, 30 Dec 2015 14:54:57 +0530 Subject: extensions: libip6t_SNAT: Add translation to nft Add translation for SNAT target to nftables. Examples: $ sudo ip6tables-translate -t nat -A postrouting -o eth0 -p tcp -j SNAT --to [fec0::1234]:80 nft add rule ip6 nat postrouting oifname eth0 ip6 nexthdr tcp counter snat fec0::1234 :80 $ sudo ip6tables-translate -t nat -A postrouting -o eth0 -p tcp -j SNAT --to [fec0::1234]:1-20 nft add rule ip6 nat postrouting oifname eth0 ip6 nexthdr tcp counter snat fec0::1234 :1-20 $ sudo ip6tables-translate -t nat -A postrouting -o eth0 -p tcp -j SNAT --to [fec0::1234]:123 --random nft add rule ip6 nat postrouting oifname eth0 ip6 nexthdr tcp counter snat fec0::1234 :123 random $ sudo ip6tables-translate -t nat -A postrouting -o eth0 -p tcp -j SNAT --to [fec0::1234]:123 --random-fully --persistent nft add rule ip6 nat postrouting oifname eth0 ip6 nexthdr tcp counter snat fec0::1234 :123 fully-random,persistent Signed-off-by: Shivani Bhardwaj Signed-off-by: Pablo Neira Ayuso --- extensions/libip6t_SNAT.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/extensions/libip6t_SNAT.c b/extensions/libip6t_SNAT.c index 8eb50b8d..b85c86c3 100644 --- a/extensions/libip6t_SNAT.c +++ b/extensions/libip6t_SNAT.c @@ -241,6 +241,55 @@ static void SNAT_save(const void *ip, const struct xt_entry_target *target) printf(" --persistent"); } +static void print_range_xlate(const struct nf_nat_range *range, + struct xt_buf *buf) +{ + if (range->flags & NF_NAT_RANGE_MAP_IPS) { + xt_buf_add(buf, "%s", + xtables_ip6addr_to_numeric(&range->min_addr.in6)); + + if (memcmp(&range->min_addr, &range->max_addr, + sizeof(range->min_addr))) + xt_buf_add(buf, "-%s", + xtables_ip6addr_to_numeric(&range->max_addr.in6)); + } + if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) { + xt_buf_add(buf, " :%hu", ntohs(range->min_proto.tcp.port)); + + if (range->max_proto.tcp.port != range->min_proto.tcp.port) + xt_buf_add(buf, "-%hu", + ntohs(range->max_proto.tcp.port)); + } +} + +static int SNAT_xlate(const struct xt_entry_target *target, + struct xt_buf *buf, int numeric) +{ + const struct nf_nat_range *range = (const void *)target->data; + bool sep_need = false; + const char *sep = " "; + + xt_buf_add(buf, "snat "); + print_range_xlate(range, buf); + if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) { + xt_buf_add(buf, " random"); + sep_need = true; + } + if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) { + if (sep_need) + sep = ","; + xt_buf_add(buf, "%sfully-random", sep); + sep_need = true; + } + if (range->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, @@ -254,6 +303,7 @@ static struct xtables_target snat_tg_reg = { .print = SNAT_print, .save = SNAT_save, .x6_options = SNAT_opts, + .xlate = SNAT_xlate, }; void _init(void) -- cgit v1.2.3