Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
include/buffer.h | 3 +
include/libnftnl/expr.h | 9 +
include/linux/netfilter/nf_tables.h | 27 +++
src/Makefile.am | 1 +
src/expr/dynset.c | 317 ++++++++++++++++++++++++++++++++++++
src/expr_ops.c | 2 +
6 files changed, 359 insertions(+)
diff --git a/include/buffer.h b/include/buffer.h
index 9d1cb8b..52942ed 100644
--- a/include/buffer.h
+++ b/include/buffer.h
@@ -66,12 +66,15 @@ int nft_buf_reg(struct nft_buf *b, int type, union nft_data_reg *reg,
#define QTHRESH "qthreshold"
#define RATE "rate"
#define SET "set"
+#define SET_NAME "set_name"
#define SIZE "size"
#define SNAPLEN "snaplen"
#define SREG_ADDR_MAX "sreg_addr_max"
#define SREG_ADDR_MIN "sreg_addr_min"
#define SREG_PROTO_MAX "sreg_proto_max"
#define SREG_PROTO_MIN "sreg_proto_min"
+#define SREG_KEY "sreg_key"
+#define SREG_DATA "sreg_data"
#define SREG "sreg"
#define TABLE "table"
#define TOTAL "total"
diff --git a/include/libnftnl/expr.h b/include/libnftnl/expr.h
index 9f25993..7bc0273 100644
--- a/include/libnftnl/expr.h
+++ b/include/libnftnl/expr.h
@@ -111,6 +111,15 @@ enum {
};
enum {
+ NFT_EXPR_DYNSET_SREG_KEY = NFT_RULE_EXPR_ATTR_BASE,
+ NFT_EXPR_DYNSET_SREG_DATA,
+ NFT_EXPR_DYNSET_OP,
+ NFT_EXPR_DYNSET_TIMEOUT,
+ NFT_EXPR_DYNSET_SET_NAME,
+ NFT_EXPR_DYNSET_SET_ID,
+};
+
+enum {
NFT_EXPR_LOG_PREFIX = NFT_RULE_EXPR_ATTR_BASE,
NFT_EXPR_LOG_GROUP,
NFT_EXPR_LOG_SNAPLEN,
diff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h
index 334b389..0e96443 100644
--- a/include/linux/netfilter/nf_tables.h
+++ b/include/linux/netfilter/nf_tables.h
@@ -516,6 +516,33 @@ enum nft_lookup_attributes {
};
#define NFTA_LOOKUP_MAX (__NFTA_LOOKUP_MAX - 1)
+enum nft_dynset_ops {
+ NFT_DYNSET_OP_ADD,
+ NFT_DYNSET_OP_UPDATE,
+};
+
+/**
+ * enum nft_dynset_attributes - dynset expression attributes
+ *
+ * @NFTA_DYNSET_SET_NAME: name of set the to add data to (NLA_STRING)
+ * @NFTA_DYNSET_SET_ID: uniquely identifier of the set in the transaction (NLA_U32)
+ * @NFTA_DYNSET_OP: operation (NLA_U32)
+ * @NFTA_DYNSET_SREG_KEY: source register of the key (NLA_U32)
+ * @NFTA_DYNSET_SREG_DATA: source register of the data (NLA_U32)
+ * @NFTA_DYNSET_TIMEOUT: timeout value for the new element (NLA_U64)
+ */
+enum nft_dynset_attributes {
+ NFTA_DYNSET_UNSPEC,
+ NFTA_DYNSET_SET_NAME,
+ NFTA_DYNSET_SET_ID,
+ NFTA_DYNSET_OP,
+ NFTA_DYNSET_SREG_KEY,
+ NFTA_DYNSET_SREG_DATA,
+ NFTA_DYNSET_TIMEOUT,
+ __NFTA_DYNSET_MAX,
+};
+#define NFTA_DYNSET_MAX (__NFTA_DYNSET_MAX - 1)
+
/**
* enum nft_payload_bases - nf_tables payload expression offset bases
*
diff --git a/src/Makefile.am b/src/Makefile.am
index 3fca5e4..a5cbe85 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -29,6 +29,7 @@ libnftnl_la_SOURCES = utils.c \
expr/limit.c \
expr/log.c \
expr/lookup.c \
+ expr/dynset.c \
expr/immediate.c \
expr/match.c \
expr/meta.c \
diff --git a/src/expr/dynset.c b/src/expr/dynset.c
new file mode 100644
index 0000000..a2c1946
--- /dev/null
+++ b/src/expr/dynset.c
@@ -0,0 +1,317 @@
+/*
+ * Copyright (c) 2014, 2015 Patrick McHardy <kaber@xxxxxxxxx>
+ *
+ * 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 "internal.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <arpa/inet.h>
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/rule.h>
+#include <libnftnl/expr.h>
+#include "data_reg.h"
+#include "expr_ops.h"
+#include <buffer.h>
+
+#ifndef IFNAMSIZ
+#define IFNAMSIZ 16
+#endif
+
+struct nft_expr_dynset {
+ enum nft_registers sreg_key;
+ enum nft_registers sreg_data;
+ enum nft_dynset_ops op;
+ uint64_t timeout;
+ char set_name[IFNAMSIZ];
+ uint32_t set_id;
+};
+
+static int
+nft_rule_expr_dynset_set(struct nft_rule_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+
+ switch (type) {
+ case NFT_EXPR_DYNSET_SREG_KEY:
+ dynset->sreg_key = *((uint32_t *)data);
+ break;
+ case NFT_EXPR_DYNSET_SREG_DATA:
+ dynset->sreg_data = *((uint32_t *)data);
+ break;
+ case NFT_EXPR_DYNSET_OP:
+ dynset->op = *((uint32_t *)data);
+ break;
+ case NFT_EXPR_DYNSET_TIMEOUT:
+ dynset->timeout = *((uint64_t *)data);
+ break;
+ case NFT_EXPR_DYNSET_SET_NAME:
+ snprintf(dynset->set_name, sizeof(dynset->set_name), "%s",
+ (const char *)data);
+ break;
+ case NFT_EXPR_DYNSET_SET_ID:
+ dynset->set_id = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nft_rule_expr_dynset_get(const struct nft_rule_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+
+ switch (type) {
+ case NFT_EXPR_DYNSET_SREG_KEY:
+ *data_len = sizeof(dynset->sreg_key);
+ return &dynset->sreg_key;
+ case NFT_EXPR_DYNSET_SREG_DATA:
+ *data_len = sizeof(dynset->sreg_data);
+ return &dynset->sreg_data;
+ case NFT_EXPR_DYNSET_OP:
+ *data_len = sizeof(dynset->op);
+ return &dynset->op;
+ case NFT_EXPR_DYNSET_TIMEOUT:
+ *data_len = sizeof(dynset->timeout);
+ return &dynset->timeout;
+ case NFT_EXPR_DYNSET_SET_NAME:
+ return dynset->set_name;
+ case NFT_EXPR_DYNSET_SET_ID:
+ return &dynset->set_id;
+ }
+ return NULL;
+}
+
+static int nft_rule_expr_dynset_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_SET_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_DYNSET_SREG_KEY:
+ case NFTA_DYNSET_SREG_DATA:
+ case NFTA_DYNSET_SET_ID:
+ case NFTA_DYNSET_OP:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ case NFTA_DYNSET_TIMEOUT:
+ if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
+ abi_breakage();
+ break;
+ case NFTA_DYNSET_SET_NAME:
+ if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nft_rule_expr_dynset_build(struct nlmsghdr *nlh, struct nft_rule_expr *e)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SREG_KEY))
+ mnl_attr_put_u32(nlh, NFTA_DYNSET_SREG_KEY, htonl(dynset->sreg_key));
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SREG_DATA))
+ mnl_attr_put_u32(nlh, NFTA_DYNSET_SREG_DATA, htonl(dynset->sreg_data));
+ if (e->flags & (1 << NFT_EXPR_DYNSET_OP))
+ mnl_attr_put_u32(nlh, NFTA_DYNSET_OP, htonl(dynset->op));
+ if (e->flags & (1 << NFT_EXPR_DYNSET_TIMEOUT))
+ mnl_attr_put_u64(nlh, NFTA_DYNSET_TIMEOUT, htobe64(dynset->timeout));
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SET_NAME))
+ mnl_attr_put_strz(nlh, NFTA_DYNSET_SET_NAME, dynset->set_name);
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SET_ID))
+ mnl_attr_put_u32(nlh, NFTA_DYNSET_SET_ID, htonl(dynset->set_id));
+}
+
+static int
+nft_rule_expr_dynset_parse(struct nft_rule_expr *e, struct nlattr *attr)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+ struct nlattr *tb[NFTA_SET_MAX+1] = {};
+ int ret = 0;
+
+ if (mnl_attr_parse_nested(attr, nft_rule_expr_dynset_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_DYNSET_SREG_KEY]) {
+ dynset->sreg_key = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SREG_KEY]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_SREG_KEY);
+ }
+ if (tb[NFTA_DYNSET_SREG_DATA]) {
+ dynset->sreg_data = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SREG_DATA]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_SREG_DATA);
+ }
+ if (tb[NFTA_DYNSET_OP]) {
+ dynset->op = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_OP]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_OP);
+ }
+ if (tb[NFTA_DYNSET_TIMEOUT]) {
+ dynset->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_DYNSET_TIMEOUT]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_TIMEOUT);
+ }
+ if (tb[NFTA_DYNSET_SET_NAME]) {
+ strcpy(dynset->set_name, mnl_attr_get_str(tb[NFTA_DYNSET_SET_NAME]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_SET_NAME);
+ }
+ if (tb[NFTA_DYNSET_SET_ID]) {
+ dynset->set_id = ntohl(mnl_attr_get_u32(tb[NFTA_DYNSET_SET_ID]));
+ e->flags |= (1 << NFT_EXPR_DYNSET_SET_ID);
+ }
+
+ return ret;
+}
+
+static int
+nft_rule_expr_dynset_json_parse(struct nft_rule_expr *e, json_t *root,
+ struct nft_parse_err *err)
+{
+#ifdef JSON_PARSING
+ const char *set_name;
+ uint32_t sreg, dreg;
+
+ set_name = nft_jansson_parse_str(root, "set", err);
+ if (set_name != NULL)
+ nft_rule_expr_dynset_str(e, NFT_EXPR_DYNSET_SET, set_name);
+
+ if (nft_jansson_parse_reg(root, "sreg", NFT_TYPE_U32, &sreg, err) == 0)
+ nft_rule_expr_dynset_u32(e, NFT_EXPR_DYNSET_SREG, sreg);
+
+ if (nft_jansson_parse_reg(root, "dreg", NFT_TYPE_U32, &dreg, err) == 0)
+ nft_rule_expr_dynset_u32(e, NFT_EXPR_DYNSET_DREG, dreg);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nft_rule_expr_dynset_xml_parse(struct nft_rule_expr *e, mxml_node_t *tree,
+ struct nft_parse_err *err)
+{
+#ifdef XML_PARSING
+ const char *set_name;
+ uint32_t sreg, dreg;
+
+ set_name = nft_mxml_str_parse(tree, "set", MXML_DESCEND_FIRST,
+ NFT_XML_MAND, err);
+ if (set_name != NULL)
+ nft_rule_expr_dynset_str(e, NFT_EXPR_DYNSET_SET, set_name);
+
+ if (nft_mxml_reg_parse(tree, "sreg", &sreg, MXML_DESCEND, NFT_XML_MAND,
+ err) == 0)
+ nft_rule_expr_dynset_u32(e, NFT_EXPR_DYNSET_SREG, sreg);
+
+ if (nft_mxml_reg_parse(tree, "dreg", &dreg, MXML_DESCEND, NFT_XML_OPT,
+ err) == 0)
+ nft_rule_expr_dynset_u32(e, NFT_EXPR_DYNSET_DREG, dreg);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nft_rule_expr_dynset_export(char *buf, size_t size,
+ struct nft_rule_expr *e, int type)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+ NFT_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SET_NAME))
+ nft_buf_str(&b, type, dynset->set_name, SET_NAME);
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SREG_KEY))
+ nft_buf_u32(&b, type, dynset->sreg_key, SREG_KEY);
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SREG_DATA))
+ nft_buf_u32(&b, type, dynset->sreg_data, SREG_DATA);
+
+ return nft_buf_done(&b);
+}
+
+static char *op2str_array[] = {
+ [NFT_DYNSET_OP_ADD] = "add",
+ [NFT_DYNSET_OP_UPDATE] = "update",
+};
+
+static const char *op2str(enum nft_dynset_ops op)
+{
+ if (op > NFT_DYNSET_OP_UPDATE)
+ return "unknown";
+ return op2str_array[op];
+}
+
+static int
+nft_rule_expr_dynset_snprintf_default(char *buf, size_t size,
+ struct nft_rule_expr *e)
+{
+ struct nft_expr_dynset *dynset = nft_expr_data(e);
+ int len = size, offset = 0, ret;
+
+ ret = snprintf(buf, len, "%s reg_key %u set %s ",
+ op2str(dynset->op), dynset->sreg_key, dynset->set_name);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+
+ if (e->flags & (1 << NFT_EXPR_DYNSET_SREG_DATA)) {
+ ret = snprintf(buf+offset, len, "sreg_data %u ", dynset->sreg_data);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+ if (e->flags & (1 << NFT_EXPR_DYNSET_TIMEOUT)) {
+ ret = snprintf(buf+offset, len, "timeout %"PRIu64"ms ",
+ dynset->timeout);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+ return offset;
+}
+
+static int
+nft_rule_expr_dynset_snprintf(char *buf, size_t size, uint32_t type,
+ uint32_t flags, struct nft_rule_expr *e)
+{
+
+ switch (type) {
+ case NFT_OUTPUT_DEFAULT:
+ return nft_rule_expr_dynset_snprintf_default(buf, size, e);
+ case NFT_OUTPUT_XML:
+ case NFT_OUTPUT_JSON:
+ return nft_rule_expr_dynset_export(buf, size, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct expr_ops expr_ops_dynset = {
+ .name = "dynset",
+ .alloc_len = sizeof(struct nft_expr_dynset),
+ .max_attr = NFTA_DYNSET_MAX,
+ .set = nft_rule_expr_dynset_set,
+ .get = nft_rule_expr_dynset_get,
+ .parse = nft_rule_expr_dynset_parse,
+ .build = nft_rule_expr_dynset_build,
+ .snprintf = nft_rule_expr_dynset_snprintf,
+ .xml_parse = nft_rule_expr_dynset_xml_parse,
+ .json_parse = nft_rule_expr_dynset_json_parse,
+};
diff --git a/src/expr_ops.c b/src/expr_ops.c
index fce5b02..2de5805 100644
--- a/src/expr_ops.c
+++ b/src/expr_ops.c
@@ -23,6 +23,7 @@ extern struct expr_ops expr_ops_redir;
extern struct expr_ops expr_ops_reject;
extern struct expr_ops expr_ops_queue;
extern struct expr_ops expr_ops_target;
+extern struct expr_ops expr_ops_dynset;
static struct expr_ops *expr_ops[] = {
&expr_ops_bitwise,
@@ -44,6 +45,7 @@ static struct expr_ops *expr_ops[] = {
&expr_ops_reject,
&expr_ops_queue,
&expr_ops_target,
+ &expr_ops_dynset,
NULL,
};
--
2.1.0
--
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