1 files changed, 187 insertions, 0 deletions
diff --git a/src/expr/fwd.c b/src/expr/fwd.c
new file mode 100644
index 0000000..1131c10
--- /dev/null
+++ b/src/expr/fwd.c
@@ -0,0 +1,187 @@
+/*
+ * (C) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * 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 <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+#include "expr_ops.h"
+#include "data_reg.h"
+#include <buffer.h>
+
+struct nftnl_expr_fwd {
+	enum nft_registers	sreg_dev;
+};
+
+static int nftnl_expr_fwd_set(struct nftnl_expr *e, uint16_t type,
+				  const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_FWD_SREG_DEV:
+		fwd->sreg_dev= *((uint32_t *)data);
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *nftnl_expr_fwd_get(const struct nftnl_expr *e,
+				      uint16_t type, uint32_t *data_len)
+{
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_FWD_SREG_DEV:
+		*data_len = sizeof(fwd->sreg_dev);
+		return &fwd->sreg_dev;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_fwd_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_FWD_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch (type) {
+	case NFTA_FWD_SREG_DEV:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void nftnl_expr_fwd_build(struct nlmsghdr *nlh, struct nftnl_expr *e)
+{
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
+		mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
+}
+
+static int nftnl_expr_fwd_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_FWD_SREG_DEV]) {
+		fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
+		e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
+	}
+
+	return ret;
+}
+
+static int nftnl_expr_fwd_json_parse(struct nftnl_expr *e, json_t *root,
+				     struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+	uint32_t sreg_dev;
+	int ret;
+
+	ret = nftnl_jansson_parse_val(root, "sreg_dev", NFTNL_TYPE_U32, &sreg_dev, err);
+	if (ret >= 0)
+		nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev);
+
+	return 0;
+#else
+	errno = EOPNOTSUPP;
+	return -1;
+#endif
+}
+
+static int nftnl_expr_fwd_xml_parse(struct nftnl_expr *e, mxml_node_t *tree,
+				    struct nftnl_parse_err *err)
+{
+#ifdef XML_PARSING
+	uint32_t sreg_dev;
+
+	if (nftnl_mxml_reg_parse(tree, "sreg_dev", &sreg_dev, MXML_DESCEND_FIRST,
+			       NFTNL_XML_OPT, err) == 0)
+		nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev);
+
+	return 0;
+#else
+	errno = EOPNOTSUPP;
+	return -1;
+#endif
+}
+
+static int nftnl_expr_fwd_export(char *buf, size_t size, struct nftnl_expr *e,
+				 int type)
+{
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+	NFTNL_BUF_INIT(b, buf, size);
+
+	if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
+		nftnl_buf_u32(&b, type, fwd->sreg_dev, "sreg_dev");
+
+	return nftnl_buf_done(&b);
+}
+
+static int nftnl_expr_fwd_snprintf_default(char *buf, size_t len,
+					   struct nftnl_expr *e, uint32_t flags)
+{
+	int size = len, offset = 0, ret;
+	struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
+		ret = snprintf(buf + offset, len, "sreg_dev %u ", fwd->sreg_dev);
+		SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+	}
+
+	return offset;
+}
+
+static int nftnl_expr_fwd_snprintf(char *buf, size_t len, uint32_t type,
+				   uint32_t flags, struct nftnl_expr *e)
+{
+	switch (type) {
+	case NFTNL_OUTPUT_DEFAULT:
+		return nftnl_expr_fwd_snprintf_default(buf, len, e, flags);
+	case NFTNL_OUTPUT_XML:
+	case NFTNL_OUTPUT_JSON:
+		return nftnl_expr_fwd_export(buf, len, e, type);
+	default:
+		break;
+	}
+	return -1;
+}
+
+struct expr_ops expr_ops_fwd = {
+	.name		= "fwd",
+	.alloc_len	= sizeof(struct nftnl_expr_fwd),
+	.max_attr	= NFTA_FWD_MAX,
+	.set		= nftnl_expr_fwd_set,
+	.get		= nftnl_expr_fwd_get,
+	.parse		= nftnl_expr_fwd_parse,
+	.build		= nftnl_expr_fwd_build,
+	.snprintf	= nftnl_expr_fwd_snprintf,
+	.xml_parse	= nftnl_expr_fwd_xml_parse,
+	.json_parse	= nftnl_expr_fwd_json_parse,
+};