1 files changed, 158 insertions, 0 deletions
diff --git a/src/expr/data_reg.c b/src/expr/data_reg.c
new file mode 100644
index 0000000..5b14695
--- /dev/null
+++ b/src/expr/data_reg.c
@@ -0,0 +1,158 @@
+/*
+ * (C) 2012 by 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.
+ *
+ * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftables/expr.h>
+#include "expr_ops.h"
+#include "data_reg.h"
+#include "internal.h"
+
+static int nft_data_parse_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_DATA_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_DATA_VALUE:
+		if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	case NFTA_DATA_VERDICT:
+		if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	}
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int nft_verdict_parse_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_VERDICT_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_VERDICT_CODE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	case NFTA_VERDICT_CHAIN:
+		if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
+			perror("mnl_attr_validate");
+			return MNL_CB_ERROR;
+		}
+		break;
+	}
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int
+nft_parse_verdict(union nft_data_reg *data, const struct nlattr *attr, int *type)
+{
+	struct nlattr *tb[NFTA_VERDICT_MAX+1];
+
+	if (mnl_attr_parse_nested(attr, nft_verdict_parse_cb, tb) < 0) {
+		perror("mnl_attr_parse_nested");
+		return -1;
+	}
+
+	if (!tb[NFTA_VERDICT_CODE])
+		return -1;
+
+	data->verdict = ntohl(mnl_attr_get_u32(tb[NFTA_VERDICT_CODE]));
+
+	switch(data->verdict) {
+	case NF_ACCEPT:
+	case NF_DROP:
+	case NF_QUEUE:
+	case NFT_CONTINUE:
+	case NFT_BREAK:
+	case NFT_RETURN:
+		if (type)
+			*type = DATA_VERDICT;
+		data->len = sizeof(data->verdict);
+		break;
+	case NFT_JUMP:
+	case NFT_GOTO:
+		if (!tb[NFTA_VERDICT_CHAIN])
+			return -1;
+
+		data->chain = strdup(mnl_attr_get_str(tb[NFTA_VERDICT_CHAIN]));
+		if (type)
+			*type = DATA_CHAIN;
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+static int
+__nft_parse_data(union nft_data_reg *data, const struct nlattr *attr)
+{
+	void *orig = mnl_attr_get_payload(attr);
+	size_t data_len = mnl_attr_get_payload_len(attr);
+
+	if (data_len == 0)
+		return -1;
+
+	if (data_len > sizeof(uint32_t) * 4)
+		return -1;
+
+	memcpy(data->val, orig, data_len);
+	data->len = data_len;
+
+	return 0;
+}
+
+int nft_parse_data(union nft_data_reg *data, struct nlattr *attr, int *type)
+{
+	struct nlattr *tb[NFTA_DATA_MAX+1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nft_data_parse_cb, tb) < 0) {
+		perror("mnl_attr_parse_nested");
+		return -1;
+	}
+	if (tb[NFTA_DATA_VALUE]) {
+		if (type)
+			*type = DATA_VALUE;
+
+		ret = __nft_parse_data(data, tb[NFTA_DATA_VALUE]);
+		if (ret < 0)
+			return ret;
+	}
+	if (tb[NFTA_DATA_VERDICT])
+		ret = nft_parse_verdict(data, tb[NFTA_DATA_VERDICT], type);
+
+	return ret;
+}