Add translation of conntrack to nftables.
Examples:
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctstate NEW,RELATED -j ACCEPT
nft add rule ip filter INPUT ct state { new,related } counter accept
$ sudo ip6tables-translate -t filter -A INPUT -m conntrack ! --ctstate NEW,RELATED -j ACCEPT
nft add rule ip6 filter INPUT ct state != { new,related } counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctproto UDP -j ACCEPT
nft add rule ip filter INPUT ct proto 17 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack ! --ctproto UDP -j ACCEPT
nft add rule ip filter INPUT ct proto != 17 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctorigsrc 10.100.2.131 -j ACCEPT
nft add rule ip filter INPUT ct original saddr 10.100.2.131 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctorigsrc 10.100.0.0/255.255.0.0 -j ACCEPT
nft add rule ip filter INPUT ct original saddr 10.100.0.0/16 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctorigdst 10.100.2.131 -j ACCEPT
nft add rule ip filter INPUT ct original daddr 10.100.2.131 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctreplsrc 10.100.2.131 -j ACCEPT
nft add rule ip filter INPUT ct reply saddr 10.100.2.131 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctrepldst 10.100.2.131 -j ACCEPT
nft add rule ip filter INPUT ct reply daddr 10.100.2.131 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctproto tcp --ctorigsrcport 443:444 -j ACCEPT
nft add rule ip filter INPUT ct original protocol 6 ct original proto-src 443-444 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack ! --ctstatus CONFIRMED -j ACCEPT
nft add rule ip filter INPUT ct status != confirmed counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctexpire 3 -j ACCEPT
nft add rule ip filter INPUT ct expiration 3 counter accept
$ sudo iptables-translate -t filter -A INPUT -m conntrack --ctdir ORIGINAL -j ACCEPT
nft add rule ip filter INPUT ct direction original counter accept
Signed-off-by: Laura Garcia Liebana <nevola@xxxxxxxxx>
---
extensions/libxt_conntrack.c | 247 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 247 insertions(+)
diff --git a/extensions/libxt_conntrack.c b/extensions/libxt_conntrack.c
index 310a468..cf6c03d 100644
--- a/extensions/libxt_conntrack.c
+++ b/extensions/libxt_conntrack.c
@@ -1182,6 +1182,28 @@ static void state_xlate_print(struct xt_xlate *xl, unsigned int statemask)
}
}
+static int state_xlate_counter(unsigned int statemask)
+{
+ int bcounter = 0;
+
+ if (statemask & XT_CONNTRACK_STATE_INVALID)
+ bcounter++;
+
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_NEW))
+ bcounter++;
+
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_RELATED))
+ bcounter++;
+
+ if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED))
+ bcounter++;
+
+ if (statemask & XT_CONNTRACK_STATE_UNTRACKED)
+ bcounter++;
+
+ return bcounter;
+}
+
static int state_xlate(const void *ip, const struct xt_entry_match *match,
struct xt_xlate *xl, int numeric)
{
@@ -1194,6 +1216,229 @@ static int state_xlate(const void *ip, const struct xt_entry_match *match,
return 1;
}
+static void status_xlate_print(struct xt_xlate *xl, unsigned int statusmask)
+{
+ const char *sep = "";
+
+ if (statusmask & IPS_EXPECTED) {
+ xt_xlate_add(xl, "%s%s", sep, "expected");
+ sep = ",";
+ }
+ if (statusmask & IPS_SEEN_REPLY) {
+ xt_xlate_add(xl, "%s%s", sep, "seen-reply");
+ sep = ",";
+ }
+ if (statusmask & IPS_ASSURED) {
+ xt_xlate_add(xl, "%s%s", sep, "assured");
+ sep = ",";
+ }
+ if (statusmask & IPS_CONFIRMED) {
+ xt_xlate_add(xl, "%s%s", sep, "confirmed");
+ sep = ",";
+ }
+}
+
+static int status_xlate_counter(unsigned int statusmask)
+{
+ int bcounter = 0;
+
+ if (statusmask & IPS_EXPECTED)
+ bcounter++;
+
+ if (statusmask & IPS_SEEN_REPLY)
+ bcounter++;
+
+ if (statusmask & IPS_ASSURED)
+ bcounter++;
+
+ if (statusmask & IPS_CONFIRMED)
+ bcounter++;
+
+ return bcounter;
+}
+
+static void addr_xlate_print(struct xt_xlate *xl,
+ const union nf_inet_addr *addr,
+ const union nf_inet_addr *mask,
+ unsigned int family)
+{
+ if (family == NFPROTO_IPV4) {
+ xt_xlate_add(xl, "%s%s", xtables_ipaddr_to_numeric(&addr->in),
+ xtables_ipmask_to_numeric(&mask->in));
+ } else if (family == NFPROTO_IPV6) {
+ xt_xlate_add(xl, "%s%s", xtables_ip6addr_to_numeric(&addr->in6),
+ xtables_ip6mask_to_numeric(&mask->in6));
+ }
+}
+
+static int _conntrack3_mt_xlate(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric,
+ int family)
+{
+ const struct xt_conntrack_mtinfo3 *sinfo = (const void *)match->data;
+ int counter;
+
+ if (sinfo->match_flags & XT_CONNTRACK_DIRECTION)
+ xt_xlate_add(xl, "ct direction %s ",
+ sinfo->invert_flags & XT_CONNTRACK_DIRECTION ?
+ "reply" : "original");
+
+ if (sinfo->match_flags & XT_CONNTRACK_PROTO)
+ xt_xlate_add(xl, "ct %s protocol %s%u ",
+ sinfo->invert_flags & XT_CONNTRACK_DIRECTION ?
+ "reply" : "original",
+ sinfo->invert_flags & XT_CONNTRACK_PROTO ?
+ "!= " : "",
+ sinfo->l4proto);
+
+ if (sinfo->match_flags & XT_CONNTRACK_STATE) {
+ counter = state_xlate_counter(sinfo->state_mask);
+ xt_xlate_add(xl, "ct state %s%s",
+ sinfo->invert_flags & XT_CONNTRACK_STATE ?
+ "!= " : "",
+ counter > 1 ? "{ " : "");
+ state_xlate_print(xl, sinfo->state_mask);
+ if (counter > 1)
+ xt_xlate_add(xl, " }");
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_STATUS) {
+ if (sinfo->status_mask == 1)
+ return 0;
+ counter = status_xlate_counter(sinfo->status_mask);
+ xt_xlate_add(xl, "ct status %s%s",
+ sinfo->invert_flags & XT_CONNTRACK_STATUS ?
+ "!= " : "",
+ counter > 1 ? "{ " : "");
+ status_xlate_print(xl, sinfo->status_mask);
+ if (counter > 1)
+ xt_xlate_add(xl, " }");
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_EXPIRES) {
+ xt_xlate_add(xl, "ct expiration %s",
+ sinfo->invert_flags & XT_CONNTRACK_EXPIRES ?
+ "!= " : "");
+ if (sinfo->expires_max == sinfo->expires_min)
+ xt_xlate_add(xl, "%lu", sinfo->expires_min);
+ else
+ xt_xlate_add(xl, "%lu-%lu", sinfo->expires_min,
+ sinfo->expires_max);
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_ORIGSRC) {
+ if (&sinfo->origsrc_addr == 0L)
+ return 0;
+
+ xt_xlate_add(xl, "ct original saddr %s",
+ sinfo->invert_flags & XT_CONNTRACK_ORIGSRC ?
+ "!= " : "");
+ addr_xlate_print(xl, &sinfo->origsrc_addr,
+ &sinfo->origsrc_mask, family);
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_ORIGDST) {
+ if (&sinfo->origdst_addr == 0L)
+ return 0;
+
+ xt_xlate_add(xl, "ct original daddr %s",
+ sinfo->invert_flags & XT_CONNTRACK_ORIGDST ?
+ "!= " : "");
+ addr_xlate_print(xl, &sinfo->origdst_addr,
+ &sinfo->origdst_mask, family);
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_REPLSRC) {
+ if (&sinfo->replsrc_addr == 0L)
+ return 0;
+
+ xt_xlate_add(xl, "ct reply saddr %s",
+ sinfo->invert_flags & XT_CONNTRACK_REPLSRC ?
+ "!= " : "");
+ addr_xlate_print(xl, &sinfo->replsrc_addr,
+ &sinfo->replsrc_mask, family);
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_REPLDST) {
+ if (&sinfo->repldst_addr == 0L)
+ return 0;
+
+ xt_xlate_add(xl, "ct reply daddr %s",
+ sinfo->invert_flags & XT_CONNTRACK_REPLDST ?
+ "!= " : "");
+ addr_xlate_print(xl, &sinfo->repldst_addr,
+ &sinfo->repldst_mask, family);
+ xt_xlate_add(xl, " ");
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_ORIGSRC_PORT) {
+ xt_xlate_add(xl, "ct original proto-src %s",
+ sinfo->invert_flags & XT_CONNTRACK_ORIGSRC_PORT ?
+ "!= " : "");
+ if (sinfo->origsrc_port == sinfo->origsrc_port_high)
+ xt_xlate_add(xl, "%u ", sinfo->origsrc_port);
+ else
+ xt_xlate_add(xl, "%u-%u ", sinfo->origsrc_port,
+ sinfo->origsrc_port_high);
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_ORIGDST_PORT) {
+ xt_xlate_add(xl, "ct original proto-dst %s",
+ sinfo->invert_flags & XT_CONNTRACK_ORIGDST_PORT ?
+ "!= " : "");
+ if (sinfo->origdst_port == sinfo->origdst_port_high)
+ xt_xlate_add(xl, "%u ", sinfo->origdst_port);
+ else
+ xt_xlate_add(xl, "%u-%u ", sinfo->origdst_port,
+ sinfo->origdst_port_high);
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_REPLSRC_PORT) {
+ xt_xlate_add(xl, "ct reply proto-src %s",
+ sinfo->invert_flags & XT_CONNTRACK_REPLSRC_PORT ?
+ "!= " : "");
+ if (sinfo->replsrc_port == sinfo->replsrc_port_high)
+ xt_xlate_add(xl, "%u ", sinfo->replsrc_port);
+ else
+ xt_xlate_add(xl, "%u-%u ", sinfo->replsrc_port,
+ sinfo->replsrc_port_high);
+ }
+
+ if (sinfo->match_flags & XT_CONNTRACK_REPLDST_PORT) {
+ xt_xlate_add(xl, "ct reply proto-dst %s",
+ sinfo->invert_flags & XT_CONNTRACK_REPLDST_PORT ?
+ "!= " : "", sinfo->repldst_port);
+ if (sinfo->repldst_port == sinfo->repldst_port_high)
+ xt_xlate_add(xl, "%u ", sinfo->repldst_port);
+ else
+ xt_xlate_add(xl, "%u-%u ", sinfo->repldst_port,
+ sinfo->repldst_port_high);
+ }
+
+ return 1;
+}
+
+static int conntrack3_mt4_xlate(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ return _conntrack3_mt_xlate(ip, match, xl, numeric, NFPROTO_IPV4);
+}
+
+static int conntrack3_mt6_xlate(const void *ip,
+ const struct xt_entry_match *match,
+ struct xt_xlate *xl, int numeric)
+{
+ return _conntrack3_mt_xlate(ip, match, xl, numeric, NFPROTO_IPV6);
+}
+
static struct xtables_match conntrack_mt_reg[] = {
{
.version = XTABLES_VERSION,
@@ -1284,6 +1529,7 @@ static struct xtables_match conntrack_mt_reg[] = {
.save = conntrack3_mt_save,
.alias = conntrack_print_name_alias,
.x6_options = conntrack3_mt_opts,
+ .xlate = conntrack3_mt4_xlate,
},
{
.version = XTABLES_VERSION,
@@ -1299,6 +1545,7 @@ static struct xtables_match conntrack_mt_reg[] = {
.save = conntrack3_mt6_save,
.alias = conntrack_print_name_alias,
.x6_options = conntrack3_mt_opts,
+ .xlate = conntrack3_mt6_xlate,
},
{
.family = NFPROTO_UNSPEC,
--
2.7.0
--
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