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authorJose M. Guisado Gomez <guigom@riseup.net>2019-09-30 19:28:07 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2019-10-01 20:27:43 +0200
commit702b543494e1c52782ed4f011f13f6085f4fbbf7 (patch)
treecf6fac4eb6a7f924bbcc2ff37a65be8929bebc2b /extensions
parent2a459ebc0ee53a57a92631fa07f6bf2b4f3fbc8c (diff)
extensions: libxt_SYNPROXY: add xlate method
This adds translation capabilities when encountering SYNPROXY inside iptables rules. Signed-off-by: Jose M. Guisado Gomez <guigom@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'extensions')
-rw-r--r--extensions/libxt_SYNPROXY.c23
-rw-r--r--extensions/libxt_SYNPROXY.txlate2
2 files changed, 25 insertions, 0 deletions
diff --git a/extensions/libxt_SYNPROXY.c b/extensions/libxt_SYNPROXY.c
index 475590ea..6a0b913e 100644
--- a/extensions/libxt_SYNPROXY.c
+++ b/extensions/libxt_SYNPROXY.c
@@ -106,6 +106,28 @@ static void SYNPROXY_save(const void *ip, const struct xt_entry_target *target)
printf(" --ecn");
}
+static int SYNPROXY_xlate(struct xt_xlate *xl,
+ const struct xt_xlate_tg_params *params)
+{
+ const struct xt_synproxy_info *info =
+ (const struct xt_synproxy_info *)params->target->data;
+
+ xt_xlate_add(xl, "synproxy ");
+
+ if (info->options & XT_SYNPROXY_OPT_SACK_PERM)
+ xt_xlate_add(xl, "sack-perm ");
+ if (info->options & XT_SYNPROXY_OPT_TIMESTAMP)
+ xt_xlate_add(xl, "timestamp ");
+ if (info->options & XT_SYNPROXY_OPT_WSCALE)
+ xt_xlate_add(xl, "wscale %u ", info->wscale);
+ if (info->options & XT_SYNPROXY_OPT_MSS)
+ xt_xlate_add(xl, "mss %u ", info->mss);
+ if (info->options & XT_SYNPROXY_OPT_ECN)
+ xt_xlate_add(xl, "ecn ");
+
+ return 1;
+}
+
static struct xtables_target synproxy_tg_reg = {
.family = NFPROTO_UNSPEC,
.name = "SYNPROXY",
@@ -119,6 +141,7 @@ static struct xtables_target synproxy_tg_reg = {
.x6_parse = SYNPROXY_parse,
.x6_fcheck = SYNPROXY_check,
.x6_options = SYNPROXY_opts,
+ .xlate = SYNPROXY_xlate,
};
void _init(void)
diff --git a/extensions/libxt_SYNPROXY.txlate b/extensions/libxt_SYNPROXY.txlate
new file mode 100644
index 00000000..b3de2b2a
--- /dev/null
+++ b/extensions/libxt_SYNPROXY.txlate
@@ -0,0 +1,2 @@
+iptables-translate -t mangle -A INPUT -i iifname -p tcp -m tcp --dport 80 -m state --state INVALID,UNTRACKED -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460
+nft add rule ip mangle INPUT iifname "iifname" tcp dport 80 ct state invalid,untracked counter synproxy sack-perm timestamp wscale 7 mss 1460