From: Florian Westphal <fw@strlen.de>
To: netfilter-devel <netfilter-devel@vger.kernel.org>
Cc: Florian Westphal <fw@strlen.de>
Subject: [PATCH v2 xtables] extensions: xt_TPROXY: add txlate support
Date: Fri, 8 Mar 2024 15:24:28 +0100 [thread overview]
Message-ID: <20240308142431.7960-1-fw@strlen.de> (raw)
Signed-off-by: Florian Westphal <fw@strlen.de>
---
v2: add ipv6 test case, use xor instead of or
extensions/libxt_TPROXY.c | 59 ++++++++++++++++++++++++++++++++++
extensions/libxt_TPROXY.txlate | 20 ++++++++++++
2 files changed, 79 insertions(+)
create mode 100644 extensions/libxt_TPROXY.txlate
diff --git a/extensions/libxt_TPROXY.c b/extensions/libxt_TPROXY.c
index d13ec85f92d0..ffc9da1383b8 100644
--- a/extensions/libxt_TPROXY.c
+++ b/extensions/libxt_TPROXY.c
@@ -147,6 +147,62 @@ static void tproxy_tg1_parse(struct xt_option_call *cb)
}
}
+static int tproxy_tg_xlate(struct xt_xlate *xl,
+ const struct xt_tproxy_target_info_v1 *info)
+{
+ int family = xt_xlate_get_family(xl);
+ uint32_t mask = info->mark_mask;
+ bool port_mandatory = false;
+ char buf[INET6_ADDRSTRLEN];
+
+ xt_xlate_add(xl, "tproxy to");
+
+ inet_ntop(family, &info->laddr, buf, sizeof(buf));
+
+ if (family == AF_INET6 && !IN6_IS_ADDR_UNSPECIFIED(&info->laddr.in6))
+ xt_xlate_add(xl, "[%s]", buf);
+ else if (family == AF_INET && info->laddr.ip)
+ xt_xlate_add(xl, "%s", buf);
+ else
+ port_mandatory = true;
+
+ if (port_mandatory)
+ xt_xlate_add(xl, " :%d", ntohs(info->lport));
+ else if (info->lport)
+ xt_xlate_add(xl, ":%d", ntohs(info->lport));
+
+ /* xt_TPROXY.c does: skb->mark = (skb->mark & ~mark_mask) ^ mark_value */
+ if (mask == 0xffffffff)
+ xt_xlate_add(xl, "meta mark set 0x%x", info->mark_value);
+ else if (mask || info->mark_value)
+ xt_xlate_add(xl, "meta mark set meta mark & 0x%x xor 0x%x",
+ ~mask, info->mark_value);
+
+ return 1;
+}
+
+static int tproxy_tg_xlate_v1(struct xt_xlate *xl,
+ const struct xt_xlate_tg_params *params)
+{
+ const struct xt_tproxy_target_info_v1 *data = (const void *)params->target->data;
+
+ return tproxy_tg_xlate(xl, data);
+}
+
+static int tproxy_tg_xlate_v0(struct xt_xlate *xl,
+ const struct xt_xlate_tg_params *params)
+{
+ const struct xt_tproxy_target_info *info = (const void *)params->target->data;
+ struct xt_tproxy_target_info_v1 t = {
+ .mark_mask = info->mark_mask,
+ .mark_value = info->mark_value,
+ .laddr.ip = info->laddr,
+ .lport = info->lport,
+ };
+
+ return tproxy_tg_xlate(xl, &t);
+}
+
static struct xtables_target tproxy_tg_reg[] = {
{
.name = "TPROXY",
@@ -160,6 +216,7 @@ static struct xtables_target tproxy_tg_reg[] = {
.save = tproxy_tg_save,
.x6_options = tproxy_tg0_opts,
.x6_parse = tproxy_tg0_parse,
+ .xlate = tproxy_tg_xlate_v0,
},
{
.name = "TPROXY",
@@ -173,6 +230,7 @@ static struct xtables_target tproxy_tg_reg[] = {
.save = tproxy_tg_save4,
.x6_options = tproxy_tg1_opts,
.x6_parse = tproxy_tg1_parse,
+ .xlate = tproxy_tg_xlate_v1,
},
{
.name = "TPROXY",
@@ -186,6 +244,7 @@ static struct xtables_target tproxy_tg_reg[] = {
.save = tproxy_tg_save6,
.x6_options = tproxy_tg1_opts,
.x6_parse = tproxy_tg1_parse,
+ .xlate = tproxy_tg_xlate_v1,
},
};
diff --git a/extensions/libxt_TPROXY.txlate b/extensions/libxt_TPROXY.txlate
new file mode 100644
index 000000000000..239bbe0dc8f9
--- /dev/null
+++ b/extensions/libxt_TPROXY.txlate
@@ -0,0 +1,20 @@
+iptables-translate -t mangle -A PREROUTING -p tcp -j TPROXY --on-port 12345 --on-ip 10.0.0.1 --tproxy-mark 0x23/0xff
+nft 'add rule ip mangle PREROUTING ip protocol tcp counter tproxy to 10.0.0.1:12345 meta mark set meta mark & 0xffffff00 xor 0x23'
+
+iptables-translate -t mangle -A PREROUTING -p udp -j TPROXY --on-port 12345 --on-ip 10.0.0.1 --tproxy-mark 0x23
+nft 'add rule ip mangle PREROUTING ip protocol udp counter tproxy to 10.0.0.1:12345 meta mark set 0x23'
+
+iptables-translate -t mangle -A PREROUTING -p udp -j TPROXY --on-port 12345 --on-ip 10.0.0.1
+nft 'add rule ip mangle PREROUTING ip protocol udp counter tproxy to 10.0.0.1:12345'
+
+iptables-translate -t mangle -A PREROUTING -p udp -j TPROXY --on-ip 10.0.0.1 --on-port 0
+nft 'add rule ip mangle PREROUTING ip protocol udp counter tproxy to 10.0.0.1'
+
+iptables-translate -t mangle -A PREROUTING -p tcp -j TPROXY --on-port 12345
+nft 'add rule ip mangle PREROUTING ip protocol tcp counter tproxy to :12345'
+
+iptables-translate -t mangle -A PREROUTING -p tcp -j TPROXY --on-port 0
+nft 'add rule ip mangle PREROUTING ip protocol tcp counter tproxy to :0'
+
+ip6tables-translate -t mangle -A PREROUTING -p tcp -j TPROXY --on-port 12345 --on-ip dead::beef --tproxy-mark 0x23/0xffff
+nft 'add rule ip6 mangle PREROUTING meta l4proto tcp counter tproxy to [dead::beef]:12345 meta mark set meta mark & 0xffff0000 xor 0x23'
--
2.44.0
next reply other threads:[~2024-03-08 14:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-08 14:24 Florian Westphal [this message]
2024-03-08 23:02 ` [PATCH v2 xtables] extensions: xt_TPROXY: add txlate support Phil Sutter
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