Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 184 insertions, 0 deletions

diff --git a/src/expr/numgen.c b/src/expr/numgen.c
new file mode 100644
index 0000000..d4020a6
--- /dev/null
+++ b/src/expr/numgen.c
@@ -0,0 +1,184 @@
+/*
+ * (C) 2016 by Laura Garcia <nevola@gmail.com>
+ *
+ * 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 <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_ng {
+	enum nft_registers	dreg;
+	unsigned int		modulus;
+	enum nft_ng_types	type;
+	unsigned int		offset;
+};
+
+static int
+nftnl_expr_ng_set(struct nftnl_expr *e, uint16_t type,
+		  const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_ng *ng = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_NG_DREG:
+		memcpy(&ng->dreg, data, sizeof(ng->dreg));
+		break;
+	case NFTNL_EXPR_NG_MODULUS:
+		memcpy(&ng->modulus, data, sizeof(ng->modulus));
+		break;
+	case NFTNL_EXPR_NG_TYPE:
+		memcpy(&ng->type, data, sizeof(ng->type));
+		break;
+	case NFTNL_EXPR_NG_OFFSET:
+		memcpy(&ng->offset, data, sizeof(ng->offset));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_ng_get(const struct nftnl_expr *e, uint16_t type,
+		  uint32_t *data_len)
+{
+	struct nftnl_expr_ng *ng = nftnl_expr_data(e);
+
+	switch (type) {
+	case NFTNL_EXPR_NG_DREG:
+		*data_len = sizeof(ng->dreg);
+		return &ng->dreg;
+	case NFTNL_EXPR_NG_MODULUS:
+		*data_len = sizeof(ng->modulus);
+		return &ng->modulus;
+	case NFTNL_EXPR_NG_TYPE:
+		*data_len = sizeof(ng->type);
+		return &ng->type;
+	case NFTNL_EXPR_NG_OFFSET:
+		*data_len = sizeof(ng->offset);
+		return &ng->offset;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_ng_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_NG_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch (type) {
+	case NFTA_NG_DREG:
+	case NFTA_NG_MODULUS:
+	case NFTA_NG_TYPE:
+	case NFTA_NG_OFFSET:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_ng_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_ng *ng = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_NG_DREG))
+		mnl_attr_put_u32(nlh, NFTA_NG_DREG, htonl(ng->dreg));
+	if (e->flags & (1 << NFTNL_EXPR_NG_MODULUS))
+		mnl_attr_put_u32(nlh, NFTA_NG_MODULUS, htonl(ng->modulus));
+	if (e->flags & (1 << NFTNL_EXPR_NG_TYPE))
+		mnl_attr_put_u32(nlh, NFTA_NG_TYPE, htonl(ng->type));
+	if (e->flags & (1 << NFTNL_EXPR_NG_OFFSET))
+		mnl_attr_put_u32(nlh, NFTA_NG_OFFSET, htonl(ng->offset));
+}
+
+static int
+nftnl_expr_ng_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_ng *ng = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_NG_MAX+1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_ng_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_NG_DREG]) {
+		ng->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_NG_DREG]));
+		e->flags |= (1 << NFTNL_EXPR_NG_DREG);
+	}
+	if (tb[NFTA_NG_MODULUS]) {
+		ng->modulus = ntohl(mnl_attr_get_u32(tb[NFTA_NG_MODULUS]));
+		e->flags |= (1 << NFTNL_EXPR_NG_MODULUS);
+	}
+	if (tb[NFTA_NG_TYPE]) {
+		ng->type = ntohl(mnl_attr_get_u32(tb[NFTA_NG_TYPE]));
+		e->flags |= (1 << NFTNL_EXPR_NG_TYPE);
+	}
+	if (tb[NFTA_NG_OFFSET]) {
+		ng->offset = ntohl(mnl_attr_get_u32(tb[NFTA_NG_OFFSET]));
+		e->flags |= (1 << NFTNL_EXPR_NG_OFFSET);
+	}
+
+	return ret;
+}
+
+static int
+nftnl_expr_ng_snprintf(char *buf, size_t remain,
+		       uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_ng *ng = nftnl_expr_data(e);
+	int offset = 0, ret;
+
+	switch (ng->type) {
+	case NFT_NG_INCREMENTAL:
+		ret = snprintf(buf, remain, "reg %u = inc mod %u ",
+			       ng->dreg, ng->modulus);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+		break;
+	case NFT_NG_RANDOM:
+		ret = snprintf(buf, remain, "reg %u = random mod %u ",
+			       ng->dreg, ng->modulus);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+		break;
+	default:
+		return 0;
+	}
+
+	if (ng->offset) {
+		ret = snprintf(buf + offset, remain, "offset %u ", ng->offset);
+		SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+	}
+
+	return offset;
+}
+
+struct expr_ops expr_ops_ng = {
+	.name		= "numgen",
+	.alloc_len	= sizeof(struct nftnl_expr_ng),
+	.max_attr	= NFTA_NG_MAX,
+	.set		= nftnl_expr_ng_set,
+	.get		= nftnl_expr_ng_get,
+	.parse		= nftnl_expr_ng_parse,
+	.build		= nftnl_expr_ng_build,
+	.output		= nftnl_expr_ng_snprintf,
+};