Adding upstream version 1.2.6.upstream/1.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/src/expr/masq.c b/src/expr/masq.c
new file mode 100644
index 0000000..e6e528d
--- /dev/null
+++ b/src/expr/masq.c
@@ -0,0 +1,167 @@
+/*
+ * (C) 2014 by Arturo Borrero Gonzalez <arturo@debian.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 <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.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_masq {
+	uint32_t		flags;
+	enum nft_registers	sreg_proto_min;
+	enum nft_registers	sreg_proto_max;
+};
+
+static int
+nftnl_expr_masq_set(struct nftnl_expr *e, uint16_t type,
+		       const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_masq *masq = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_MASQ_FLAGS:
+		memcpy(&masq->flags, data, sizeof(masq->flags));
+		break;
+	case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
+		memcpy(&masq->sreg_proto_min, data, sizeof(masq->sreg_proto_min));
+		break;
+	case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
+		memcpy(&masq->sreg_proto_max, data, sizeof(masq->sreg_proto_max));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_masq_get(const struct nftnl_expr *e, uint16_t type,
+		       uint32_t *data_len)
+{
+	struct nftnl_expr_masq *masq = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_MASQ_FLAGS:
+		*data_len = sizeof(masq->flags);
+		return &masq->flags;
+	case NFTNL_EXPR_MASQ_REG_PROTO_MIN:
+		*data_len = sizeof(masq->sreg_proto_min);
+		return &masq->sreg_proto_min;
+	case NFTNL_EXPR_MASQ_REG_PROTO_MAX:
+		*data_len = sizeof(masq->sreg_proto_max);
+		return &masq->sreg_proto_max;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_masq_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_MASQ_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch (type) {
+	case NFTA_MASQ_REG_PROTO_MIN:
+	case NFTA_MASQ_REG_PROTO_MAX:
+	case NFTA_MASQ_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_masq_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_masq *masq = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN))
+		mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MIN,
+				 htobe32(masq->sreg_proto_min));
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX))
+		mnl_attr_put_u32(nlh, NFTA_MASQ_REG_PROTO_MAX,
+				 htobe32(masq->sreg_proto_max));
+}
+
+static int
+nftnl_expr_masq_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_masq *masq = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_masq_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_MASQ_FLAGS]) {
+		masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_MASQ_FLAGS);
+        }
+	if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
+		masq->sreg_proto_min =
+			be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MIN]));
+		e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN);
+	}
+	if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
+		masq->sreg_proto_max =
+			be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_REG_PROTO_MAX]));
+		e->flags |= (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX);
+	}
+
+	return 0;
+}
+
+static int nftnl_expr_masq_snprintf(char *buf, size_t remain,
+				    uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_masq *masq = nftnl_expr_data(e);
+	int offset = 0, ret = 0;
+
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MIN)) {
+		ret = snprintf(buf + offset, remain, "proto_min reg %u ",
+			       masq->sreg_proto_min);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_REG_PROTO_MAX)) {
+		ret = snprintf(buf + offset, remain, "proto_max reg %u ",
+			       masq->sreg_proto_max);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+	if (e->flags & (1 << NFTNL_EXPR_MASQ_FLAGS)) {
+		ret = snprintf(buf + offset, remain, "flags 0x%x ", masq->flags);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	return offset;
+}
+
+struct expr_ops expr_ops_masq = {
+	.name		= "masq",
+	.alloc_len	= sizeof(struct nftnl_expr_masq),
+	.max_attr	= NFTA_MASQ_MAX,
+	.set		= nftnl_expr_masq_set,
+	.get		= nftnl_expr_masq_get,
+	.parse		= nftnl_expr_masq_parse,
+	.build		= nftnl_expr_masq_build,
+	.output		= nftnl_expr_masq_snprintf,
+};