Signed-off-by: Máté Eckl <[email protected]>
---
include/libnftnl/expr.h | 6 +
include/linux/netfilter/nf_tables.h | 16 +++
src/Makefile.am | 1 +
src/expr/tproxy.c | 206 ++++++++++++++++++++++++++++
src/expr_ops.c | 2 +
5 files changed, 231 insertions(+)
create mode 100644 src/expr/tproxy.c
diff --git a/include/libnftnl/expr.h b/include/libnftnl/expr.h
index 219104e..141b04a 100644
--- a/include/libnftnl/expr.h
+++ b/include/libnftnl/expr.h
@@ -137,6 +137,12 @@ enum {
NFTNL_EXPR_NAT_FLAGS,
};
+enum {
+ NFTNL_EXPR_TPROXY_FAMILY = NFTNL_EXPR_BASE,
+ NFTNL_EXPR_TPROXY_REG_ADDR,
+ NFTNL_EXPR_TPROXY_REG_PORT,
+};
+
enum {
NFTNL_EXPR_LOOKUP_SREG = NFTNL_EXPR_BASE,
NFTNL_EXPR_LOOKUP_DREG,
diff --git a/include/linux/netfilter/nf_tables.h
b/include/linux/netfilter/nf_tables.h
index 91449ef..18f385a 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -1223,6 +1223,22 @@ enum nft_nat_attributes {
};
#define NFTA_NAT_MAX (__NFTA_NAT_MAX - 1)
+/**
+ * enum nft_tproxy_attributes - nf_tables tproxy expression netlink attributes
+ *
+ * NFTA_TPROXY_FAMILY: Target address family (NLA_U32: nft_registers)
+ * NFTA_TPROXY_REG_ADDR: Target address register (NLA_U32: nft_registers)
+ * NFTA_TPROXY_REG_PORT: Target port register (NLA_U32: nft_registers)
+ */
+enum nft_tproxy_attributes {
+ NFTA_TPROXY_UNSPEC,
+ NFTA_TPROXY_FAMILY,
+ NFTA_TPROXY_REG_ADDR,
+ NFTA_TPROXY_REG_PORT,
+ __NFTA_TPROXY_MAX
+};
+#define NFTA_TPROXY_MAX (__NFTA_TPROXY_MAX - 1)
+
/**
* enum nft_masq_attributes - nf_tables masquerade expression attributes
*
diff --git a/src/Makefile.am b/src/Makefile.am
index c66a257..fc03661 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -45,6 +45,7 @@ libnftnl_la_SOURCES = utils.c \
expr/meta.c \
expr/numgen.c \
expr/nat.c \
+ expr/tproxy.c \
expr/objref.c \
expr/payload.c \
expr/queue.c \
diff --git a/src/expr/tproxy.c b/src/expr/tproxy.c
new file mode 100644
index 0000000..95f5d0c
--- /dev/null
+++ b/src/expr/tproxy.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2018 Máté Eckl <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <limits.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_tproxy {
+ enum nft_registers sreg_addr;
+ enum nft_registers sreg_port;
+ int family;
+};
+
+static int
+nftnl_expr_tproxy_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_TPROXY_FAMILY:
+ tproxy->family = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_TPROXY_REG_ADDR:
+ tproxy->sreg_addr = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_TPROXY_REG_PORT:
+ tproxy->sreg_port = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+
+ return 0;
+}
+
+static const void *
+nftnl_expr_tproxy_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ switch(type) {
+ case NFTNL_EXPR_TPROXY_FAMILY:
+ *data_len = sizeof(tproxy->family);
+ return &tproxy->family;
+ case NFTNL_EXPR_TPROXY_REG_ADDR:
+ *data_len = sizeof(tproxy->sreg_addr);
+ return &tproxy->sreg_addr;
+ case NFTNL_EXPR_TPROXY_REG_PORT:
+ *data_len = sizeof(tproxy->sreg_port);
+ return &tproxy->sreg_port;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_tproxy_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, NFTA_TPROXY_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case NFTA_TPROXY_FAMILY:
+ case NFTA_TPROXY_REG_ADDR:
+ case NFTA_TPROXY_REG_PORT:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int
+nftnl_expr_tproxy_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_TPROXY_MAX + 1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_tproxy_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_TPROXY_FAMILY]) {
+ tproxy->family =
ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_FAMILY]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_FAMILY);
+ }
+ if (tb[NFTA_TPROXY_REG_ADDR]) {
+ tproxy->sreg_addr =
+ ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_ADDR]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_ADDR);
+ }
+ if (tb[NFTA_TPROXY_REG_PORT]) {
+ tproxy->sreg_port =
+ ntohl(mnl_attr_get_u32(tb[NFTA_TPROXY_REG_PORT]));
+ e->flags |= (1 << NFTNL_EXPR_TPROXY_REG_PORT);
+ }
+
+ return 0;
+}
+
+static void
+nftnl_expr_tproxy_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_FAMILY,
htonl(tproxy->family));
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_ADDR,
+ htonl(tproxy->sreg_addr));
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
+ mnl_attr_put_u32(nlh, NFTA_TPROXY_REG_PORT,
+ htonl(tproxy->sreg_port));
+}
+
+static int
+nftnl_expr_tproxy_snprintf_default(char *buf, size_t size,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_tproxy *tproxy = nftnl_expr_data(e);
+ int remain = size, offset = 0, ret = 0;
+
+ ret = snprintf(buf, remain, "tproxy ");
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ ret = snprintf(buf + offset, remain, "%s ",
+ nftnl_family2str(tproxy->family));
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR)) {
+ ret = snprintf(buf + offset, remain,
+ "addr reg %u ", tproxy->sreg_addr);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ if (e->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT)) {
+ ret = snprintf(buf + offset, remain,
+ "port reg %u ", tproxy->sreg_port);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ return offset;
+}
+
+static int
+nftnl_expr_tproxy_snprintf(char *buf, size_t size, uint32_t type,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_tproxy_snprintf_default(buf, size, e);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_tproxy_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_tproxy *n1 = nftnl_expr_data(e1);
+ struct nftnl_expr_tproxy *n2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_REG_ADDR))
+ eq &= (n1->sreg_addr == n2->sreg_addr);
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_REG_PORT))
+ eq &= (n1->sreg_port == n2->sreg_port);
+ if (e1->flags & (1 << NFTNL_EXPR_TPROXY_FAMILY))
+ eq &= (n1->family == n2->family);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_tproxy = {
+ .name = "tproxy",
+ .alloc_len = sizeof(struct nftnl_expr_tproxy),
+ .max_attr = NFTA_TPROXY_MAX,
+ .cmp = nftnl_expr_tproxy_cmp,
+ .set = nftnl_expr_tproxy_set,
+ .get = nftnl_expr_tproxy_get,
+ .parse = nftnl_expr_tproxy_parse,
+ .build = nftnl_expr_tproxy_build,
+ .snprintf = nftnl_expr_tproxy_snprintf,
+};
diff --git a/src/expr_ops.c b/src/expr_ops.c
index cbb2a1b..72a4679 100644
--- a/src/expr_ops.c
+++ b/src/expr_ops.c
@@ -22,6 +22,7 @@ extern struct expr_ops expr_ops_match;
extern struct expr_ops expr_ops_meta;
extern struct expr_ops expr_ops_ng;
extern struct expr_ops expr_ops_nat;
+extern struct expr_ops expr_ops_tproxy;
extern struct expr_ops expr_ops_objref;
extern struct expr_ops expr_ops_payload;
extern struct expr_ops expr_ops_range;
@@ -60,6 +61,7 @@ static struct expr_ops *expr_ops[] = {
&expr_ops_meta,
&expr_ops_ng,
&expr_ops_nat,
+ &expr_ops_tproxy,
&expr_ops_notrack,
&expr_ops_payload,
&expr_ops_range,
--
ecklm
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