diff options
author | Jose M. Guisado Gomez <guigom@riseup.net> | 2019-09-30 19:28:07 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-10-01 20:27:43 +0200 |
commit | 702b543494e1c52782ed4f011f13f6085f4fbbf7 (patch) | |
tree | cf6fac4eb6a7f924bbcc2ff37a65be8929bebc2b /extensions | |
parent | 2a459ebc0ee53a57a92631fa07f6bf2b4f3fbc8c (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.c | 23 | ||||
-rw-r--r-- | extensions/libxt_SYNPROXY.txlate | 2 |
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 |