Adding upstream version 1.0.9.upstream/1.0.9upstream

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

1 files changed, 140 insertions, 0 deletions

diff --git a/src/numgen.c b/src/numgen.c
new file mode 100644
index 0000000..3029fa5
--- /dev/null
+++ b/src/numgen.c
@@ -0,0 +1,140 @@
+/*
+ * Number generator expression definitions.
+ *
+ * Copyright (c) 2016 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 version 2 (or any
+ * later) as published by the Free Software Foundation.
+ */
+
+#include <nft.h>
+
+#include <nftables.h>
+#include <expression.h>
+#include <datatype.h>
+#include <gmputil.h>
+#include <numgen.h>
+#include <utils.h>
+
+static const char *numgen_type[NFT_NG_RANDOM + 1] = {
+	[NFT_NG_INCREMENTAL]	= "inc",
+	[NFT_NG_RANDOM]		= "random",
+};
+
+static const char *numgen_type_str(enum nft_ng_types type)
+{
+	if (type > NFT_NG_RANDOM)
+		return "[unknown numgen]";
+
+	return numgen_type[type];
+}
+
+static void numgen_expr_print(const struct expr *expr, struct output_ctx *octx)
+{
+	nft_print(octx, "numgen %s mod %u",
+		  numgen_type_str(expr->numgen.type),
+		  expr->numgen.mod);
+	if (expr->numgen.offset)
+		nft_print(octx, " offset %u", expr->numgen.offset);
+}
+
+static bool numgen_expr_cmp(const struct expr *e1, const struct expr *e2)
+{
+	return e1->numgen.type == e2->numgen.type &&
+	       e1->numgen.mod == e2->numgen.mod &&
+	       e1->numgen.offset == e2->numgen.offset;
+}
+
+static void numgen_expr_clone(struct expr *new, const struct expr *expr)
+{
+	new->numgen.type = expr->numgen.type;
+	new->numgen.mod = expr->numgen.mod;
+	new->numgen.offset = expr->numgen.offset;
+}
+
+#define NFTNL_UDATA_NUMGEN_TYPE 0
+#define NFTNL_UDATA_NUMGEN_MOD 1
+#define NFTNL_UDATA_NUMGEN_OFFSET 2
+#define NFTNL_UDATA_NUMGEN_MAX 3
+
+static int numgen_expr_build_udata(struct nftnl_udata_buf *udbuf,
+				   const struct expr *expr)
+{
+        nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_TYPE, expr->numgen.type);
+        nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_MOD, expr->numgen.mod);
+        nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_OFFSET, expr->numgen.offset);
+
+        return 0;
+}
+
+static int numgen_parse_udata(const struct nftnl_udata *attr, void *data)
+{
+        const struct nftnl_udata **ud = data;
+        uint8_t type = nftnl_udata_type(attr);
+        uint8_t len = nftnl_udata_len(attr);
+
+        switch (type) {
+        case NFTNL_UDATA_NUMGEN_TYPE:
+        case NFTNL_UDATA_NUMGEN_MOD:
+        case NFTNL_UDATA_NUMGEN_OFFSET:
+                if (len != sizeof(uint32_t))
+                        return -1;
+                break;
+        default:
+                return 0;
+        }
+
+        ud[type] = attr;
+        return 0;
+}
+
+static struct expr *numgen_expr_parse_udata(const struct nftnl_udata *attr)
+{
+        const struct nftnl_udata *ud[NFTNL_UDATA_NUMGEN_MAX + 1] = {};
+	enum nft_ng_types type;
+	uint32_t mod, offset;
+        int err;
+
+        err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
+                                numgen_parse_udata, ud);
+        if (err < 0)
+                return NULL;
+
+        if (!ud[NFTNL_UDATA_NUMGEN_TYPE] ||
+	    !ud[NFTNL_UDATA_NUMGEN_MOD] ||
+	    !ud[NFTNL_UDATA_NUMGEN_OFFSET])
+                return NULL;
+
+	type = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_TYPE]);
+	mod = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_MOD]);
+	offset = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_OFFSET]);
+
+	return numgen_expr_alloc(&internal_location, type, mod, offset);
+}
+
+const struct expr_ops numgen_expr_ops = {
+	.type		= EXPR_NUMGEN,
+	.name		= "numgen",
+	.print		= numgen_expr_print,
+	.json		= numgen_expr_json,
+	.cmp		= numgen_expr_cmp,
+	.clone		= numgen_expr_clone,
+	.parse_udata	= numgen_expr_parse_udata,
+	.build_udata	= numgen_expr_build_udata,
+};
+
+struct expr *numgen_expr_alloc(const struct location *loc,
+			       enum nft_ng_types type, uint32_t mod,
+			       uint32_t offset)
+{
+	struct expr *expr;
+
+	expr = expr_alloc(loc, EXPR_NUMGEN, &integer_type,
+			  BYTEORDER_HOST_ENDIAN, 4 * BITS_PER_BYTE);
+	expr->numgen.type  = type;
+	expr->numgen.mod   = mod;
+	expr->numgen.offset = offset;
+
+	return expr;
+}