Adding upstream version 1.2.6.upstream/1.2.6upstream

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

1 files changed, 221 insertions, 0 deletions

diff --git a/src/expr/meta.c b/src/expr/meta.c
new file mode 100644
index 0000000..183f441
--- /dev/null
+++ b/src/expr/meta.c
@@ -0,0 +1,221 @@
+/*
+ * (C) 2012 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 <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>
+
+#ifndef NFT_META_MAX
+#define NFT_META_MAX (NFT_META_BRI_BROUTE + 1)
+#endif
+
+struct nftnl_expr_meta {
+	enum nft_meta_keys	key;
+	enum nft_registers	dreg;
+	enum nft_registers	sreg;
+};
+
+static int
+nftnl_expr_meta_set(struct nftnl_expr *e, uint16_t type,
+		       const void *data, uint32_t data_len)
+{
+	struct nftnl_expr_meta *meta = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_META_KEY:
+		memcpy(&meta->key, data, sizeof(meta->key));
+		break;
+	case NFTNL_EXPR_META_DREG:
+		memcpy(&meta->dreg, data, sizeof(meta->dreg));
+		break;
+	case NFTNL_EXPR_META_SREG:
+		memcpy(&meta->sreg, data, sizeof(meta->sreg));
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_expr_meta_get(const struct nftnl_expr *e, uint16_t type,
+		       uint32_t *data_len)
+{
+	struct nftnl_expr_meta *meta = nftnl_expr_data(e);
+
+	switch(type) {
+	case NFTNL_EXPR_META_KEY:
+		*data_len = sizeof(meta->key);
+		return &meta->key;
+	case NFTNL_EXPR_META_DREG:
+		*data_len = sizeof(meta->dreg);
+		return &meta->dreg;
+	case NFTNL_EXPR_META_SREG:
+		*data_len = sizeof(meta->sreg);
+		return &meta->sreg;
+	}
+	return NULL;
+}
+
+static int nftnl_expr_meta_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_META_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_META_KEY:
+	case NFTA_META_DREG:
+	case NFTA_META_SREG:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_meta_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_meta *meta = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_META_KEY))
+		mnl_attr_put_u32(nlh, NFTA_META_KEY, htonl(meta->key));
+	if (e->flags & (1 << NFTNL_EXPR_META_DREG))
+		mnl_attr_put_u32(nlh, NFTA_META_DREG, htonl(meta->dreg));
+	if (e->flags & (1 << NFTNL_EXPR_META_SREG))
+		mnl_attr_put_u32(nlh, NFTA_META_SREG, htonl(meta->sreg));
+}
+
+static int
+nftnl_expr_meta_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+	struct nftnl_expr_meta *meta = nftnl_expr_data(e);
+	struct nlattr *tb[NFTA_META_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_expr_meta_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_META_KEY]) {
+		meta->key = ntohl(mnl_attr_get_u32(tb[NFTA_META_KEY]));
+		e->flags |= (1 << NFTNL_EXPR_META_KEY);
+	}
+	if (tb[NFTA_META_DREG]) {
+		meta->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_DREG]));
+		e->flags |= (1 << NFTNL_EXPR_META_DREG);
+	}
+	if (tb[NFTA_META_SREG]) {
+		meta->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_SREG]));
+		e->flags |= (1 << NFTNL_EXPR_META_SREG);
+	}
+
+	return 0;
+}
+
+static const char *meta_key2str_array[NFT_META_MAX] = {
+	[NFT_META_LEN]		= "len",
+	[NFT_META_PROTOCOL]	= "protocol",
+	[NFT_META_NFPROTO]	= "nfproto",
+	[NFT_META_L4PROTO]	= "l4proto",
+	[NFT_META_PRIORITY]	= "priority",
+	[NFT_META_MARK]		= "mark",
+	[NFT_META_IIF]		= "iif",
+	[NFT_META_OIF]		= "oif",
+	[NFT_META_IIFNAME]	= "iifname",
+	[NFT_META_OIFNAME]	= "oifname",
+	[NFT_META_IIFTYPE]	= "iiftype",
+	[NFT_META_OIFTYPE]	= "oiftype",
+	[NFT_META_SKUID]	= "skuid",
+	[NFT_META_SKGID]	= "skgid",
+	[NFT_META_NFTRACE]	= "nftrace",
+	[NFT_META_RTCLASSID]	= "rtclassid",
+	[NFT_META_SECMARK]	= "secmark",
+	[NFT_META_BRI_IIFNAME]	= "bri_iifname",
+	[NFT_META_BRI_OIFNAME]	= "bri_oifname",
+	[NFT_META_PKTTYPE]	= "pkttype",
+	[NFT_META_CPU]		= "cpu",
+	[NFT_META_IIFGROUP]	= "iifgroup",
+	[NFT_META_OIFGROUP]	= "oifgroup",
+	[NFT_META_CGROUP]	= "cgroup",
+	[NFT_META_PRANDOM]	= "prandom",
+	[NFT_META_SECPATH]	= "secpath",
+	[NFT_META_IIFKIND]	= "iifkind",
+	[NFT_META_OIFKIND]	= "oifkind",
+	[NFT_META_BRI_IIFPVID]	 = "bri_iifpvid",
+	[NFT_META_BRI_IIFVPROTO] = "bri_iifvproto",
+	[NFT_META_TIME_NS]	= "time",
+	[NFT_META_TIME_DAY]	= "day",
+	[NFT_META_TIME_HOUR]	= "hour",
+	[NFT_META_SDIF]		= "sdif",
+	[NFT_META_SDIFNAME]	= "sdifname",
+	[NFT_META_BRI_BROUTE]	= "broute",
+};
+
+static const char *meta_key2str(uint8_t key)
+{
+	if (key < NFT_META_MAX)
+		return meta_key2str_array[key];
+
+	return "unknown";
+}
+
+static inline int str2meta_key(const char *str)
+{
+	int i;
+
+	for (i = 0; i < NFT_META_MAX; i++) {
+		if (strcmp(str, meta_key2str_array[i]) == 0)
+			return i;
+	}
+
+	errno = EINVAL;
+	return -1;
+}
+
+static int
+nftnl_expr_meta_snprintf(char *buf, size_t len,
+			 uint32_t flags, const struct nftnl_expr *e)
+{
+	struct nftnl_expr_meta *meta = nftnl_expr_data(e);
+
+	if (e->flags & (1 << NFTNL_EXPR_META_SREG)) {
+		return snprintf(buf, len, "set %s with reg %u ",
+				meta_key2str(meta->key), meta->sreg);
+	}
+	if (e->flags & (1 << NFTNL_EXPR_META_DREG)) {
+		return snprintf(buf, len, "load %s => reg %u ",
+				meta_key2str(meta->key), meta->dreg);
+	}
+	return 0;
+}
+
+struct expr_ops expr_ops_meta = {
+	.name		= "meta",
+	.alloc_len	= sizeof(struct nftnl_expr_meta),
+	.max_attr	= NFTA_META_MAX,
+	.set		= nftnl_expr_meta_set,
+	.get		= nftnl_expr_meta_get,
+	.parse		= nftnl_expr_meta_parse,
+	.build		= nftnl_expr_meta_build,
+	.output		= nftnl_expr_meta_snprintf,
+};