Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 217 insertions, 0 deletions

diff --git a/src/expr/range.c b/src/expr/range.c
new file mode 100644
index 0000000..473add8
--- /dev/null
+++ b/src/expr/range.c
@@ -0,0 +1,217 @@
+/*
+ * (C) 2016 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.
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+struct nftnl_expr_range {
+	union nftnl_data_reg	data_from;
+	union nftnl_data_reg	data_to;
+	enum nft_registers	sreg;
+	enum nft_range_ops	op;
+};
+
+static int nftnl_expr_range_set(struct nftnl_expr *e, uint16_t type,
+				const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_range *range = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_RANGE_SREG:
+		memcpy(&range->sreg, data, sizeof(range->sreg));
+		break;
+	case NFTNL_EXPR_RANGE_OP:
+		memcpy(&range->op, data, sizeof(range->op));
+		break;
+	case NFTNL_EXPR_RANGE_FROM_DATA:
+		memcpy(&range->data_from.val, data, data_len);
+		range->data_from.len = data_len;
+		break;
+	case NFTNL_EXPR_RANGE_TO_DATA:
+		memcpy(&range->data_to.val, data, data_len);
+		range->data_to.len = data_len;
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *nftnl_expr_range_get(const struct nftnl_expr *e,
+					uint16_t type, uint32_t *data_len)
+{
+	struct nftnl_expr_range *range = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_RANGE_SREG:
+		*data_len = sizeof(range->sreg);
+		return &range->sreg;
+	case NFTNL_EXPR_RANGE_OP:
+		*data_len = sizeof(range->op);
+		return &range->op;
+	case NFTNL_EXPR_RANGE_FROM_DATA:
+		*data_len = range->data_from.len;
+		return &range->data_from.val;
+	case NFTNL_EXPR_RANGE_TO_DATA:
+		*data_len = range->data_to.len;
+		return &range->data_to.val;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_range_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_RANGE_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_RANGE_SREG:
+	case NFTA_RANGE_OP:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	case NFTA_RANGE_FROM_DATA:
+	case NFTA_RANGE_TO_DATA:
+		if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_range_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_range *range = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_RANGE_SREG))
+		mnl_attr_put_u32(nlh, NFTA_RANGE_SREG, htonl(range->sreg));
+	if (e->flags & (1 << NFTNL_EXPR_RANGE_OP))
+		mnl_attr_put_u32(nlh, NFTA_RANGE_OP, htonl(range->op));
+	if (e->flags & (1 << NFTNL_EXPR_RANGE_FROM_DATA)) {
+		struct nlattr *nest;
+
+		nest = mnl_attr_nest_start(nlh, NFTA_RANGE_FROM_DATA);
+		mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_from.len,
+			     range->data_from.val);
+		mnl_attr_nest_end(nlh, nest);
+	}
+	if (e->flags & (1 << NFTNL_EXPR_RANGE_TO_DATA)) {
+		struct nlattr *nest;
+
+		nest = mnl_attr_nest_start(nlh, NFTA_RANGE_TO_DATA);
+		mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_to.len,
+			     range->data_to.val);
+		mnl_attr_nest_end(nlh, nest);
+	}
+}
+
+static int
+nftnl_expr_range_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_range *range = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_RANGE_MAX+1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_range_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_RANGE_SREG]) {
+		range->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_SREG]));
+		e->flags |= (1 << NFTA_RANGE_SREG);
+	}
+	if (tb[NFTA_RANGE_OP]) {
+		range->op = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_OP]));
+		e->flags |= (1 << NFTA_RANGE_OP);
+	}
+	if (tb[NFTA_RANGE_FROM_DATA]) {
+		ret = nftnl_parse_data(&range->data_from,
+				       tb[NFTA_RANGE_FROM_DATA], NULL);
+		e->flags |= (1 << NFTA_RANGE_FROM_DATA);
+	}
+	if (tb[NFTA_RANGE_TO_DATA]) {
+		ret = nftnl_parse_data(&range->data_to,
+				       tb[NFTA_RANGE_TO_DATA], NULL);
+		e->flags |= (1 << NFTA_RANGE_TO_DATA);
+	}
+
+	return ret;
+}
+
+static const char *expr_range_str[] = {
+	[NFT_RANGE_EQ]	= "eq",
+	[NFT_RANGE_NEQ]	= "neq",
+};
+
+static const char *range2str(uint32_t op)
+{
+	if (op > NFT_RANGE_NEQ)
+		return "unknown";
+
+	return expr_range_str[op];
+}
+
+static inline int nftnl_str2range(const char *op)
+{
+	if (strcmp(op, "eq") == 0)
+		return NFT_RANGE_EQ;
+	else if (strcmp(op, "neq") == 0)
+		return NFT_RANGE_NEQ;
+	else {
+		errno = EINVAL;
+		return -1;
+	}
+}
+
+static int nftnl_expr_range_snprintf(char *buf, size_t remain,
+				     uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_range *range = nftnl_expr_data(e);
+	int offset = 0, ret;
+
+	ret = snprintf(buf, remain, "%s reg %u ",
+		       range2str(range->op), range->sreg);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_from,
+				      0, DATA_VALUE);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_to,
+				      0, DATA_VALUE);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	return offset;
+}
+
+struct expr_ops expr_ops_range = {
+	.name		= "range",
+	.alloc_len	= sizeof(struct nftnl_expr_range),
+	.max_attr	= NFTA_RANGE_MAX,
+	.set		= nftnl_expr_range_set,
+	.get		= nftnl_expr_range_get,
+	.parse		= nftnl_expr_range_parse,
+	.build		= nftnl_expr_range_build,
+	.output		= nftnl_expr_range_snprintf,
+};