Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 278 insertions, 0 deletions

diff --git a/src/expr/nat.c b/src/expr/nat.c
new file mode 100644
index 0000000..ca727be
--- /dev/null
+++ b/src/expr/nat.c
@@ -0,0 +1,278 @@
+/*
+ * (C) 2012-2014 Pablo Neira Ayuso <pablo@netfilter.org>
+ * (C) 2012 Intel Corporation
+ *
+ * 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.
+ *
+ * Authors:
+ * 	Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
+ */
+
+#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_nat {
+	enum nft_registers sreg_addr_min;
+	enum nft_registers sreg_addr_max;
+	enum nft_registers sreg_proto_min;
+	enum nft_registers sreg_proto_max;
+	int                family;
+	enum nft_nat_types type;
+	uint32_t	   flags;
+};
+
+static int
+nftnl_expr_nat_set(struct nftnl_expr *e, uint16_t type,
+		      const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_nat *nat = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_NAT_TYPE:
+		memcpy(&nat->type, data, sizeof(nat->type));
+		break;
+	case NFTNL_EXPR_NAT_FAMILY:
+		memcpy(&nat->family, data, sizeof(nat->family));
+		break;
+	case NFTNL_EXPR_NAT_REG_ADDR_MIN:
+		memcpy(&nat->sreg_addr_min, data, sizeof(nat->sreg_addr_min));
+		break;
+	case NFTNL_EXPR_NAT_REG_ADDR_MAX:
+		memcpy(&nat->sreg_addr_max, data, sizeof(nat->sreg_addr_max));
+		break;
+	case NFTNL_EXPR_NAT_REG_PROTO_MIN:
+		memcpy(&nat->sreg_proto_min, data, sizeof(nat->sreg_proto_min));
+		break;
+	case NFTNL_EXPR_NAT_REG_PROTO_MAX:
+		memcpy(&nat->sreg_proto_max, data, sizeof(nat->sreg_proto_max));
+		break;
+	case NFTNL_EXPR_NAT_FLAGS:
+		memcpy(&nat->flags, data, sizeof(nat->flags));
+		break;
+	default:
+		return -1;
+	}
+
+	return 0;
+}
+
+static const void *
+nftnl_expr_nat_get(const struct nftnl_expr *e, uint16_t type,
+		      uint32_t *data_len)
+{
+	struct nftnl_expr_nat *nat = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_NAT_TYPE:
+		*data_len = sizeof(nat->type);
+		return &nat->type;
+	case NFTNL_EXPR_NAT_FAMILY:
+		*data_len = sizeof(nat->family);
+		return &nat->family;
+	case NFTNL_EXPR_NAT_REG_ADDR_MIN:
+		*data_len = sizeof(nat->sreg_addr_min);
+		return &nat->sreg_addr_min;
+	case NFTNL_EXPR_NAT_REG_ADDR_MAX:
+		*data_len = sizeof(nat->sreg_addr_max);
+		return &nat->sreg_addr_max;
+	case NFTNL_EXPR_NAT_REG_PROTO_MIN:
+		*data_len = sizeof(nat->sreg_proto_min);
+		return &nat->sreg_proto_min;
+	case NFTNL_EXPR_NAT_REG_PROTO_MAX:
+		*data_len = sizeof(nat->sreg_proto_max);
+		return &nat->sreg_proto_max;
+	case NFTNL_EXPR_NAT_FLAGS:
+		*data_len = sizeof(nat->flags);
+		return &nat->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_nat_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_NAT_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_NAT_TYPE:
+	case NFTA_NAT_FAMILY:
+	case NFTA_NAT_REG_ADDR_MIN:
+	case NFTA_NAT_REG_ADDR_MAX:
+	case NFTA_NAT_REG_PROTO_MIN:
+	case NFTA_NAT_REG_PROTO_MAX:
+	case NFTA_NAT_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static int
+nftnl_expr_nat_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_nat *nat = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_NAT_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_nat_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_NAT_TYPE]) {
+		nat->type = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_TYPE]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_TYPE);
+	}
+	if (tb[NFTA_NAT_FAMILY]) {
+		nat->family = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_FAMILY]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_FAMILY);
+	}
+	if (tb[NFTA_NAT_REG_ADDR_MIN]) {
+		nat->sreg_addr_min =
+			ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_ADDR_MIN]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN);
+	}
+	if (tb[NFTA_NAT_REG_ADDR_MAX]) {
+		nat->sreg_addr_max =
+			ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_ADDR_MAX]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX);
+	}
+	if (tb[NFTA_NAT_REG_PROTO_MIN]) {
+		nat->sreg_proto_min =
+			ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_PROTO_MIN]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN);
+	}
+	if (tb[NFTA_NAT_REG_PROTO_MAX]) {
+		nat->sreg_proto_max =
+			ntohl(mnl_attr_get_u32(tb[NFTA_NAT_REG_PROTO_MAX]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX);
+	}
+	if (tb[NFTA_NAT_FLAGS]) {
+		nat->flags = ntohl(mnl_attr_get_u32(tb[NFTA_NAT_FLAGS]));
+		e->flags |= (1 << NFTNL_EXPR_NAT_FLAGS);
+	}
+
+	return 0;
+}
+
+static void
+nftnl_expr_nat_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_nat *nat = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_TYPE))
+		mnl_attr_put_u32(nlh, NFTA_NAT_TYPE, htonl(nat->type));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_FAMILY))
+		mnl_attr_put_u32(nlh, NFTA_NAT_FAMILY, htonl(nat->family));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN))
+		mnl_attr_put_u32(nlh, NFTA_NAT_REG_ADDR_MIN,
+				 htonl(nat->sreg_addr_min));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX))
+		mnl_attr_put_u32(nlh, NFTA_NAT_REG_ADDR_MAX,
+				 htonl(nat->sreg_addr_max));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN))
+		mnl_attr_put_u32(nlh, NFTA_NAT_REG_PROTO_MIN,
+				 htonl(nat->sreg_proto_min));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX))
+		mnl_attr_put_u32(nlh, NFTA_NAT_REG_PROTO_MAX,
+				 htonl(nat->sreg_proto_max));
+	if (e->flags & (1 << NFTNL_EXPR_NAT_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_NAT_FLAGS, htonl(nat->flags));
+}
+
+static inline const char *nat2str(uint16_t nat)
+{
+	switch (nat) {
+	case NFT_NAT_SNAT:
+		return "snat";
+	case NFT_NAT_DNAT:
+		return "dnat";
+	default:
+		return "unknown";
+	}
+}
+
+static inline int nftnl_str2nat(const char *nat)
+{
+	if (strcmp(nat, "snat") == 0)
+		return NFT_NAT_SNAT;
+	else if (strcmp(nat, "dnat") == 0)
+		return NFT_NAT_DNAT;
+	else {
+		errno = EINVAL;
+		return -1;
+	}
+}
+
+static int
+nftnl_expr_nat_snprintf(char *buf, size_t remain,
+			uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_nat *nat = nftnl_expr_data(e);
+	int offset = 0, ret = 0;
+
+	ret = snprintf(buf, remain, "%s ", nat2str(nat->type));
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	ret = snprintf(buf + offset, remain, "%s ",
+		       nftnl_family2str(nat->family));
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MIN)) {
+		ret = snprintf(buf + offset, remain,
+			       "addr_min reg %u ", nat->sreg_addr_min);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_ADDR_MAX)) {
+		ret = snprintf(buf + offset, remain,
+			       "addr_max reg %u ", nat->sreg_addr_max);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MIN)) {
+		ret = snprintf(buf + offset, remain,
+			       "proto_min reg %u ", nat->sreg_proto_min);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_REG_PROTO_MAX)) {
+		ret = snprintf(buf + offset, remain,
+			       "proto_max reg %u ", nat->sreg_proto_max);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	if (e->flags & (1 << NFTNL_EXPR_NAT_FLAGS)) {
+		ret = snprintf(buf + offset, remain, "flags 0x%x ", nat->flags);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	return offset;
+}
+
+struct expr_ops expr_ops_nat = {
+	.name		= "nat",
+	.alloc_len	= sizeof(struct nftnl_expr_nat),
+	.max_attr	= NFTA_NAT_MAX,
+	.set		= nftnl_expr_nat_set,
+	.get		= nftnl_expr_nat_get,
+	.parse		= nftnl_expr_nat_parse,
+	.build		= nftnl_expr_nat_build,
+	.output		= nftnl_expr_nat_snprintf,
+};