Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 224 insertions, 0 deletions

diff --git a/src/expr/byteorder.c b/src/expr/byteorder.c
new file mode 100644
index 0000000..89ed0a8
--- /dev/null
+++ b/src/expr/byteorder.c
@@ -0,0 +1,224 @@
+/*
+ * (C) 2012-2013 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.
+ *
+ * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h> /* for memcpy */
+#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_byteorder {
+	enum nft_registers	sreg;
+	enum nft_registers	dreg;
+	enum nft_byteorder_ops	op;
+	unsigned int		len;
+	unsigned int		size;
+};
+
+static int
+nftnl_expr_byteorder_set(struct nftnl_expr *e, uint16_t type,
+			  const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_byteorder *byteorder = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_BYTEORDER_SREG:
+		memcpy(&byteorder->sreg, data, sizeof(byteorder->sreg));
+		break;
+	case NFTNL_EXPR_BYTEORDER_DREG:
+		memcpy(&byteorder->dreg, data, sizeof(byteorder->dreg));
+		break;
+	case NFTNL_EXPR_BYTEORDER_OP:
+		memcpy(&byteorder->op, data, sizeof(byteorder->op));
+		break;
+	case NFTNL_EXPR_BYTEORDER_LEN:
+		memcpy(&byteorder->len, data, sizeof(byteorder->len));
+		break;
+	case NFTNL_EXPR_BYTEORDER_SIZE:
+		memcpy(&byteorder->size, data, sizeof(byteorder->size));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_byteorder_get(const struct nftnl_expr *e, uint16_t type,
+			    uint32_t *data_len)
+{
+	struct nftnl_expr_byteorder *byteorder = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_BYTEORDER_SREG:
+		*data_len = sizeof(byteorder->sreg);
+		return &byteorder->sreg;
+	case NFTNL_EXPR_BYTEORDER_DREG:
+		*data_len = sizeof(byteorder->dreg);
+		return &byteorder->dreg;
+	case NFTNL_EXPR_BYTEORDER_OP:
+		*data_len = sizeof(byteorder->op);
+		return &byteorder->op;
+	case NFTNL_EXPR_BYTEORDER_LEN:
+		*data_len = sizeof(byteorder->len);
+		return &byteorder->len;
+	case NFTNL_EXPR_BYTEORDER_SIZE:
+		*data_len = sizeof(byteorder->size);
+		return &byteorder->size;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_byteorder_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_BYTEORDER_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_BYTEORDER_SREG:
+	case NFTA_BYTEORDER_DREG:
+	case NFTA_BYTEORDER_OP:
+	case NFTA_BYTEORDER_LEN:
+	case NFTA_BYTEORDER_SIZE:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_byteorder_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_byteorder *byteorder = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SREG)) {
+		mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SREG,
+				 htonl(byteorder->sreg));
+	}
+	if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_DREG)) {
+		mnl_attr_put_u32(nlh, NFTA_BYTEORDER_DREG,
+				 htonl(byteorder->dreg));
+	}
+	if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_OP)) {
+		mnl_attr_put_u32(nlh, NFTA_BYTEORDER_OP,
+				 htonl(byteorder->op));
+	}
+	if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_LEN)) {
+		mnl_attr_put_u32(nlh, NFTA_BYTEORDER_LEN,
+				 htonl(byteorder->len));
+	}
+	if (e->flags & (1 << NFTNL_EXPR_BYTEORDER_SIZE)) {
+		mnl_attr_put_u32(nlh, NFTA_BYTEORDER_SIZE,
+				 htonl(byteorder->size));
+	}
+}
+
+static int
+nftnl_expr_byteorder_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_byteorder *byteorder = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_BYTEORDER_MAX+1] = {};
+	int ret = 0;
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_byteorder_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_BYTEORDER_SREG]) {
+		byteorder->sreg =
+			ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SREG]));
+		e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SREG);
+	}
+	if (tb[NFTA_BYTEORDER_DREG]) {
+		byteorder->dreg =
+			ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_DREG]));
+		e->flags |= (1 << NFTNL_EXPR_BYTEORDER_DREG);
+	}
+	if (tb[NFTA_BYTEORDER_OP]) {
+		byteorder->op =
+			ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_OP]));
+		e->flags |= (1 << NFTNL_EXPR_BYTEORDER_OP);
+	}
+	if (tb[NFTA_BYTEORDER_LEN]) {
+		byteorder->len =
+			ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_LEN]));
+		e->flags |= (1 << NFTNL_EXPR_BYTEORDER_LEN);
+	}
+	if (tb[NFTA_BYTEORDER_SIZE]) {
+		byteorder->size =
+			ntohl(mnl_attr_get_u32(tb[NFTA_BYTEORDER_SIZE]));
+		e->flags |= (1 << NFTNL_EXPR_BYTEORDER_SIZE);
+	}
+
+	return ret;
+}
+
+static const char *expr_byteorder_str[] = {
+	[NFT_BYTEORDER_HTON] = "hton",
+	[NFT_BYTEORDER_NTOH] = "ntoh",
+};
+
+static const char *bo2str(uint32_t type)
+{
+	if (type > NFT_BYTEORDER_HTON)
+		return "unknown";
+
+	return expr_byteorder_str[type];
+}
+
+static inline int nftnl_str2ntoh(const char *op)
+{
+	if (strcmp(op, "ntoh") == 0)
+		return NFT_BYTEORDER_NTOH;
+	else if (strcmp(op, "hton") == 0)
+		return NFT_BYTEORDER_HTON;
+	else {
+		errno = EINVAL;
+		return -1;
+	}
+}
+
+static int
+nftnl_expr_byteorder_snprintf(char *buf, size_t remain,
+			      uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_byteorder *byteorder = nftnl_expr_data(e);
+	int offset = 0, ret;
+
+	ret = snprintf(buf, remain, "reg %u = %s(reg %u, %u, %u) ",
+		       byteorder->dreg, bo2str(byteorder->op),
+		       byteorder->sreg, byteorder->size, byteorder->len);
+	SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+
+	return offset;
+}
+
+struct expr_ops expr_ops_byteorder = {
+	.name		= "byteorder",
+	.alloc_len	= sizeof(struct nftnl_expr_byteorder),
+	.max_attr	= NFTA_BYTEORDER_MAX,
+	.set		= nftnl_expr_byteorder_set,
+	.get		= nftnl_expr_byteorder_get,
+	.parse		= nftnl_expr_byteorder_parse,
+	.build		= nftnl_expr_byteorder_build,
+	.output		= nftnl_expr_byteorder_snprintf,
+};