1 files changed, 138 insertions, 0 deletions
diff --git a/src/expr/reject.c b/src/expr/reject.c
new file mode 100644
index 0000000..c7c9441
--- /dev/null
+++ b/src/expr/reject.c
@@ -0,0 +1,138 @@
+/*
+ * (C) 2013 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 <errno.h>
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_reject {
+	uint32_t		type;
+	uint8_t			icmp_code;
+};
+
+static int nftnl_expr_reject_set(struct nftnl_expr *e, uint16_t type,
+				    const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_reject *reject = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_REJECT_TYPE:
+		memcpy(&reject->type, data, sizeof(reject->type));
+		break;
+	case NFTNL_EXPR_REJECT_CODE:
+		memcpy(&reject->icmp_code, data, sizeof(reject->icmp_code));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_reject_get(const struct nftnl_expr *e, uint16_t type,
+			 uint32_t *data_len)
+{
+	struct nftnl_expr_reject *reject = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_REJECT_TYPE:
+		*data_len = sizeof(reject->type);
+		return &reject->type;
+	case NFTNL_EXPR_REJECT_CODE:
+		*data_len = sizeof(reject->icmp_code);
+		return &reject->icmp_code;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_reject_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_REJECT_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_REJECT_TYPE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	case NFTA_REJECT_ICMP_CODE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_reject_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_reject *reject = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_REJECT_TYPE))
+		mnl_attr_put_u32(nlh, NFTA_REJECT_TYPE, htonl(reject->type));
+	if (e->flags & (1 << NFTNL_EXPR_REJECT_CODE))
+		mnl_attr_put_u8(nlh, NFTA_REJECT_ICMP_CODE, reject->icmp_code);
+}
+
+static int
+nftnl_expr_reject_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_reject *reject = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_REJECT_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_reject_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_REJECT_TYPE]) {
+		reject->type = ntohl(mnl_attr_get_u32(tb[NFTA_REJECT_TYPE]));
+		e->flags |= (1 << NFTNL_EXPR_REJECT_TYPE);
+	}
+	if (tb[NFTA_REJECT_ICMP_CODE]) {
+		reject->icmp_code = mnl_attr_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
+		e->flags |= (1 << NFTNL_EXPR_REJECT_CODE);
+	}
+
+	return 0;
+}
+
+static int
+nftnl_expr_reject_snprintf(char *buf, size_t len,
+			   uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_reject *reject = nftnl_expr_data(e);
+
+	return snprintf(buf, len, "type %u code %u ",
+			reject->type, reject->icmp_code);
+}
+
+struct expr_ops expr_ops_reject = {
+	.name		= "reject",
+	.alloc_len	= sizeof(struct nftnl_expr_reject),
+	.max_attr	= NFTA_REJECT_MAX,
+	.set		= nftnl_expr_reject_set,
+	.get		= nftnl_expr_reject_get,
+	.parse		= nftnl_expr_reject_parse,
+	.build		= nftnl_expr_reject_build,
+	.output		= nftnl_expr_reject_snprintf,
+};