src: support for stateful objects

This patch allows you to add, to delete and to get stateful objects,
this support two object types: counter and quota.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

2 files changed, 389 insertions, 0 deletions

diff --git a/src/obj/counter.c b/src/obj/counter.c
new file mode 100644
index 0000000..beadc93
--- /dev/null
+++ b/src/obj/counter.c
@@ -0,0 +1,184 @@
+/*
+ * (C) 2012-2016 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 <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+#include "internal.h"
+#include "obj.h"
+
+static int
+nftnl_obj_counter_set(struct nftnl_obj *e, uint16_t type,
+			  const void *data, uint32_t data_len)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+
+	switch(type) {
+	case NFTNL_OBJ_CTR_BYTES:
+		ctr->bytes = *((uint64_t *)data);
+		break;
+	case NFTNL_OBJ_CTR_PKTS:
+		ctr->pkts = *((uint64_t *)data);
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *
+nftnl_obj_counter_get(const struct nftnl_obj *e, uint16_t type,
+			  uint32_t *data_len)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+
+	switch(type) {
+	case NFTNL_OBJ_CTR_BYTES:
+		*data_len = sizeof(ctr->bytes);
+		return &ctr->bytes;
+	case NFTNL_OBJ_CTR_PKTS:
+		*data_len = sizeof(ctr->pkts);
+		return &ctr->pkts;
+	}
+	return NULL;
+}
+
+static int nftnl_obj_counter_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_COUNTER_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_COUNTER_BYTES:
+	case NFTA_COUNTER_PACKETS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_counter_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+
+	if (e->flags & (1 << NFTNL_OBJ_CTR_BYTES))
+		mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
+	if (e->flags & (1 << NFTNL_OBJ_CTR_PKTS))
+		mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
+}
+
+static int
+nftnl_obj_counter_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+	struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_obj_counter_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_COUNTER_BYTES]) {
+		ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
+		e->flags |= (1 << NFTNL_OBJ_CTR_BYTES);
+	}
+	if (tb[NFTA_COUNTER_PACKETS]) {
+		ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
+		e->flags |= (1 << NFTNL_OBJ_CTR_PKTS);
+	}
+
+	return 0;
+}
+
+static int
+nftnl_obj_counter_json_parse(struct nftnl_obj *e, json_t *root,
+				 struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+	uint64_t uval64;
+
+	if (nftnl_jansson_parse_val(root, "pkts", NFTNL_TYPE_U64, &uval64,
+				  err) == 0)
+		nftnl_obj_set_u64(e, NFTNL_OBJ_CTR_PKTS, uval64);
+
+	if (nftnl_jansson_parse_val(root, "bytes", NFTNL_TYPE_U64, &uval64,
+				  err) == 0)
+		nftnl_obj_set_u64(e, NFTNL_OBJ_CTR_BYTES, uval64);
+
+	return 0;
+#else
+	errno = EOPNOTSUPP;
+	return -1;
+#endif
+}
+
+static int nftnl_obj_counter_export(char *buf, size_t size,
+				    const struct nftnl_obj *e, int type)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+	NFTNL_BUF_INIT(b, buf, size);
+
+	if (e->flags & (1 << NFTNL_OBJ_CTR_PKTS))
+		nftnl_buf_u64(&b, type, ctr->pkts, PKTS);
+	if (e->flags & (1 << NFTNL_OBJ_CTR_BYTES))
+		nftnl_buf_u64(&b, type, ctr->bytes, BYTES);
+
+	return nftnl_buf_done(&b);
+}
+
+static int nftnl_obj_counter_snprintf_default(char *buf, size_t len,
+					       const struct nftnl_obj *e)
+{
+	struct nftnl_obj_counter *ctr = nftnl_obj_data(e);
+
+	return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
+			ctr->pkts, ctr->bytes);
+}
+
+static int nftnl_obj_counter_snprintf(char *buf, size_t len, uint32_t type,
+				       uint32_t flags,
+				       const struct nftnl_obj *e)
+{
+	switch (type) {
+	case NFTNL_OUTPUT_DEFAULT:
+		return nftnl_obj_counter_snprintf_default(buf, len, e);
+	case NFTNL_OUTPUT_XML:
+	case NFTNL_OUTPUT_JSON:
+		return nftnl_obj_counter_export(buf, len, e, type);
+	default:
+		break;
+	}
+	return -1;
+}
+
+struct obj_ops obj_ops_counter = {
+	.name		= "counter",
+	.type		= NFT_OBJECT_COUNTER,
+	.alloc_len	= sizeof(struct nftnl_obj_counter),
+	.max_attr	= NFTA_COUNTER_MAX,
+	.set		= nftnl_obj_counter_set,
+	.get		= nftnl_obj_counter_get,
+	.parse		= nftnl_obj_counter_parse,
+	.build		= nftnl_obj_counter_build,
+	.snprintf	= nftnl_obj_counter_snprintf,
+	.json_parse	= nftnl_obj_counter_json_parse,
+};
diff --git a/src/obj/quota.c b/src/obj/quota.c
new file mode 100644
index 0000000..d5757b2
--- /dev/null
+++ b/src/obj/quota.c
@@ -0,0 +1,205 @@
+/*
+ * (C) 2012-2016 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 <stdio.h>
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/object.h>
+
+#include "obj.h"
+
+static int nftnl_obj_quota_set(struct nftnl_obj *e, uint16_t type,
+				const void *data, uint32_t data_len)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+
+	switch (type) {
+	case NFTNL_OBJ_QUOTA_BYTES:
+		quota->bytes = *((uint64_t *)data);
+		break;
+	case NFTNL_OBJ_QUOTA_CONSUMED:
+		quota->consumed = *((uint64_t *)data);
+		break;
+	case NFTNL_OBJ_QUOTA_FLAGS:
+		quota->flags = *((uint32_t *)data);
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
+static const void *nftnl_obj_quota_get(const struct nftnl_obj *e,
+					uint16_t type, uint32_t *data_len)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+
+	switch (type) {
+	case NFTNL_OBJ_QUOTA_BYTES:
+		*data_len = sizeof(quota->bytes);
+		return &quota->bytes;
+	case NFTNL_OBJ_QUOTA_CONSUMED:
+		*data_len = sizeof(quota->consumed);
+		return &quota->consumed;
+	case NFTNL_OBJ_QUOTA_FLAGS:
+		*data_len = sizeof(quota->flags);
+		return &quota->flags;
+	}
+	return NULL;
+}
+
+static int nftnl_obj_quota_cb(const struct nlattr *attr, void *data)
+{
+	int type = mnl_attr_get_type(attr);
+	const struct nlattr **tb = data;
+
+	if (mnl_attr_type_valid(attr, NFTA_QUOTA_MAX) < 0)
+		return MNL_CB_OK;
+
+	switch(type) {
+	case NFTA_QUOTA_BYTES:
+	case NFTA_QUOTA_CONSUMED:
+		if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
+			abi_breakage();
+		break;
+	case NFTA_QUOTA_FLAGS:
+		if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+			abi_breakage();
+		break;
+	}
+
+	tb[type] = attr;
+	return MNL_CB_OK;
+}
+
+static void
+nftnl_obj_quota_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_BYTES))
+		mnl_attr_put_u64(nlh, NFTA_QUOTA_BYTES, htobe64(quota->bytes));
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_CONSUMED))
+		mnl_attr_put_u64(nlh, NFTA_QUOTA_CONSUMED,
+				 htobe64(quota->consumed));
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_FLAGS))
+		mnl_attr_put_u32(nlh, NFTA_QUOTA_FLAGS, htonl(quota->flags));
+}
+
+static int
+nftnl_obj_quota_parse(struct nftnl_obj *e, struct nlattr *attr)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+	struct nlattr *tb[NFTA_QUOTA_MAX + 1] = {};
+
+	if (mnl_attr_parse_nested(attr, nftnl_obj_quota_cb, tb) < 0)
+		return -1;
+
+	if (tb[NFTA_QUOTA_BYTES]) {
+		quota->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_BYTES]));
+		e->flags |= (1 << NFTNL_OBJ_QUOTA_BYTES);
+	}
+	if (tb[NFTA_QUOTA_CONSUMED]) {
+		quota->consumed =
+			be64toh(mnl_attr_get_u64(tb[NFTA_QUOTA_CONSUMED]));
+		e->flags |= (1 << NFTNL_OBJ_QUOTA_CONSUMED);
+	}
+	if (tb[NFTA_QUOTA_FLAGS]) {
+		quota->flags = ntohl(mnl_attr_get_u32(tb[NFTA_QUOTA_FLAGS]));
+		e->flags |= (1 << NFTNL_OBJ_QUOTA_FLAGS);
+	}
+
+	return 0;
+}
+
+static int
+nftnl_obj_quota_json_parse(struct nftnl_obj *e, json_t *root,
+				 struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+	uint64_t bytes;
+	uint32_t flags;
+
+	if (nftnl_jansson_parse_val(root, "bytes", NFTNL_TYPE_U64, &bytes,
+				  err) == 0)
+		nftnl_obj_set_u64(e, NFTNL_OBJ_QUOTA_BYTES, bytes);
+	if (nftnl_jansson_parse_val(root, "consumed", NFTNL_TYPE_U64, &bytes,
+				    err) == 0)
+		nftnl_obj_set_u64(e, NFTNL_OBJ_QUOTA_CONSUMED, bytes);
+	if (nftnl_jansson_parse_val(root, "flags", NFTNL_TYPE_U32, &flags,
+				  err) == 0)
+		nftnl_obj_set_u32(e, NFTNL_OBJ_QUOTA_FLAGS, flags);
+
+	return 0;
+#else
+	errno = EOPNOTSUPP;
+	return -1;
+#endif
+}
+
+static int nftnl_obj_quota_export(char *buf, size_t size,
+				   const struct nftnl_obj *e, int type)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+	NFTNL_BUF_INIT(b, buf, size);
+
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_BYTES))
+		nftnl_buf_u64(&b, type, quota->bytes, BYTES);
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_CONSUMED))
+		nftnl_buf_u64(&b, type, quota->consumed, CONSUMED);
+	if (e->flags & (1 << NFTNL_OBJ_QUOTA_FLAGS))
+		nftnl_buf_u32(&b, type, quota->flags, FLAGS);
+
+	return nftnl_buf_done(&b);
+}
+
+static int nftnl_obj_quota_snprintf_default(char *buf, size_t len,
+					       const struct nftnl_obj *e)
+{
+	struct nftnl_obj_quota *quota = nftnl_obj_data(e);
+
+	return snprintf(buf, len, "bytes %"PRIu64" flags %u ",
+			quota->bytes, quota->flags);
+}
+
+static int nftnl_obj_quota_snprintf(char *buf, size_t len, uint32_t type,
+				       uint32_t flags,
+				       const struct nftnl_obj *e)
+{
+	switch (type) {
+	case NFTNL_OUTPUT_DEFAULT:
+		return nftnl_obj_quota_snprintf_default(buf, len, e);
+	case NFTNL_OUTPUT_XML:
+	case NFTNL_OUTPUT_JSON:
+		return nftnl_obj_quota_export(buf, len, e, type);
+	default:
+		break;
+	}
+	return -1;
+}
+
+struct obj_ops obj_ops_quota = {
+	.name		= "quota",
+	.type		= NFT_OBJECT_QUOTA,
+	.alloc_len	= sizeof(struct nftnl_obj_quota),
+	.max_attr	= NFTA_QUOTA_MAX,
+	.set		= nftnl_obj_quota_set,
+	.get		= nftnl_obj_quota_get,
+	.parse		= nftnl_obj_quota_parse,
+	.build		= nftnl_obj_quota_build,
+	.snprintf	= nftnl_obj_quota_snprintf,
+	.json_parse	= nftnl_obj_quota_json_parse,
+};