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-rw-r--r--src/Makefile.am1
-rw-r--r--src/expr/masq.c208
2 files changed, 209 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index 047bf01..d57ff96 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -35,6 +35,7 @@ libnftnl_la_SOURCES = utils.c \
expr/queue.c \
expr/reject.c \
expr/target.c \
+ expr/masq.c \
expr/data_reg.h \
libnftnl.map \
expr_ops.h \
diff --git a/src/expr/masq.c b/src/expr/masq.c
new file mode 100644
index 0000000..6a1c609
--- /dev/null
+++ b/src/expr/masq.c
@@ -0,0 +1,208 @@
+/*
+ * (C) 2014 by Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ *
+ * 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/expr.h>
+#include <libnftnl/rule.h>
+#include "expr_ops.h"
+
+struct nft_expr_masq {
+ uint32_t flags;
+};
+
+static int
+nft_rule_expr_masq_set(struct nft_rule_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ switch (type) {
+ case NFT_EXPR_MASQ_FLAGS:
+ masq->flags = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nft_rule_expr_masq_get(const struct nft_rule_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ switch (type) {
+ case NFT_EXPR_MASQ_FLAGS:
+ *data_len = sizeof(masq->flags);
+ return &masq->flags;
+ }
+ return NULL;
+}
+
+static int nft_rule_expr_masq_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_MASQ_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_MASQ_FLAGS:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nft_rule_expr_masq_build(struct nlmsghdr *nlh, struct nft_rule_expr *e)
+{
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ if (e->flags & (1 << NFT_EXPR_MASQ_FLAGS))
+ mnl_attr_put_u32(nlh, NFTA_MASQ_FLAGS, htobe32(masq->flags));
+}
+
+static int
+nft_rule_expr_masq_parse(struct nft_rule_expr *e, struct nlattr *attr)
+{
+ struct nft_expr_masq *masq = nft_expr_data(e);
+ struct nlattr *tb[NFTA_MASQ_MAX+1] = {};
+
+ if (mnl_attr_parse_nested(attr, nft_rule_expr_masq_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_MASQ_FLAGS]) {
+ masq->flags = be32toh(mnl_attr_get_u32(tb[NFTA_MASQ_FLAGS]));
+ e->flags |= (1 << NFT_EXPR_MASQ_FLAGS);
+ }
+
+ return 0;
+}
+
+static int
+nft_rule_expr_masq_json_parse(struct nft_rule_expr *e, json_t *root,
+ struct nft_parse_err *err)
+{
+#ifdef JSON_PARSING
+ uint32_t flags;
+
+ if (nft_jansson_parse_val(root, "flags", NFT_TYPE_U32, &flags,
+ err) == 0)
+ nft_rule_expr_set_u32(e, NFT_EXPR_MASQ_FLAGS, flags);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nft_rule_expr_masq_xml_parse(struct nft_rule_expr *e, mxml_node_t *tree,
+ struct nft_parse_err *err)
+{
+#ifdef XML_PARSING
+ uint32_t flags;
+
+ if (nft_mxml_num_parse(tree, "flags", MXML_DESCEND_FIRST, BASE_DEC,
+ &flags, NFT_TYPE_U32, NFT_XML_MAND, err) == 0)
+ nft_rule_expr_set_u32(e, NFT_EXPR_MASQ_FLAGS, flags);
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+static int nft_rule_expr_masq_snprintf_json(char *buf, size_t len,
+ struct nft_rule_expr *e)
+{
+ int ret, size = len, offset = 0;
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ if (e->flags & (1 << NFT_EXPR_MASQ_FLAGS)) {
+ ret = snprintf(buf + offset, len, "\"flags\":%u", masq->flags);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+
+ return offset;
+}
+
+static int nft_rule_expr_masq_snprintf_xml(char *buf, size_t len,
+ struct nft_rule_expr *e)
+{
+ int ret, size = len, offset = 0;
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ if (e->flags & (1 << NFT_EXPR_MASQ_FLAGS)) {
+ ret = snprintf(buf + offset, len, "<flags>%u</flags>",
+ masq->flags);
+ SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
+ }
+
+ return offset;
+}
+
+static int nft_rule_expr_masq_snprintf_default(char *buf, size_t len,
+ struct nft_rule_expr *e)
+{
+ struct nft_expr_masq *masq = nft_expr_data(e);
+
+ return snprintf(buf, len, " flags %u ",
+ masq->flags);
+}
+
+static int nft_rule_expr_masq_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags, struct nft_rule_expr *e)
+{
+ switch (type) {
+ case NFT_OUTPUT_DEFAULT:
+ return nft_rule_expr_masq_snprintf_default(buf, len, e);
+ case NFT_OUTPUT_XML:
+ return nft_rule_expr_masq_snprintf_xml(buf, len, e);
+ case NFT_OUTPUT_JSON:
+ return nft_rule_expr_masq_snprintf_json(buf, len, e);
+ default:
+ break;
+ }
+ return -1;
+}
+
+struct expr_ops expr_ops_masq = {
+ .name = "masq",
+ .alloc_len = sizeof(struct nft_expr_masq),
+ .max_attr = NFTA_MASQ_MAX,
+ .set = nft_rule_expr_masq_set,
+ .get = nft_rule_expr_masq_get,
+ .parse = nft_rule_expr_masq_parse,
+ .build = nft_rule_expr_masq_build,
+ .snprintf = nft_rule_expr_masq_snprintf,
+ .xml_parse = nft_rule_expr_masq_xml_parse,
+ .json_parse = nft_rule_expr_masq_json_parse,
+};
+
+static void __init expr_masq_init(void)
+{
+ nft_expr_ops_register(&expr_ops_masq);
+}