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-rw-r--r--src/meta.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/meta.c b/src/meta.c
index 796d8e94..135f84b5 100644
--- a/src/meta.c
+++ b/src/meta.c
@@ -807,6 +807,55 @@ static void meta_expr_pctx_update(struct proto_ctx *ctx,
}
}
+#define NFTNL_UDATA_META_KEY 0
+#define NFTNL_UDATA_META_MAX 1
+
+static int meta_expr_build_udata(struct nftnl_udata_buf *udbuf,
+ const struct expr *expr)
+{
+ nftnl_udata_put_u32(udbuf, NFTNL_UDATA_META_KEY, expr->meta.key);
+
+ return 0;
+}
+
+static int meta_parse_udata(const struct nftnl_udata *attr, void *data)
+{
+ const struct nftnl_udata **ud = data;
+ uint8_t type = nftnl_udata_type(attr);
+ uint8_t len = nftnl_udata_len(attr);
+
+ switch (type) {
+ case NFTNL_UDATA_META_KEY:
+ if (len != sizeof(uint32_t))
+ return -1;
+ break;
+ default:
+ return 0;
+ }
+
+ ud[type] = attr;
+ return 0;
+}
+
+static struct expr *meta_expr_parse_udata(const struct nftnl_udata *attr)
+{
+ const struct nftnl_udata *ud[NFTNL_UDATA_META_MAX + 1] = {};
+ uint32_t key;
+ int err;
+
+ err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
+ meta_parse_udata, ud);
+ if (err < 0)
+ return NULL;
+
+ if (!ud[NFTNL_UDATA_META_KEY])
+ return NULL;
+
+ key = nftnl_udata_get_u32(ud[NFTNL_UDATA_META_KEY]);
+
+ return meta_expr_alloc(&internal_location, key);
+}
+
const struct expr_ops meta_expr_ops = {
.type = EXPR_META,
.name = "meta",
@@ -815,6 +864,8 @@ const struct expr_ops meta_expr_ops = {
.cmp = meta_expr_cmp,
.clone = meta_expr_clone,
.pctx_update = meta_expr_pctx_update,
+ .build_udata = meta_expr_build_udata,
+ .parse_udata = meta_expr_parse_udata,
};
struct expr *meta_expr_alloc(const struct location *loc, enum nft_meta_keys key)