+
+const struct nlattr *
+nl_attr_find__(const struct nlattr *attrs, size_t size, uint16_t type)
+{
+ const struct nlattr *nla;
+ size_t left;
+
+ NL_ATTR_FOR_EACH (nla, left, attrs, size) {
+ if (nl_attr_type (nla) == type) {
+ return nla;
+ }
+ }
+ return NULL;
+}
+
+/* Returns the first Netlink attribute within 'buf' with the specified 'type',
+ * skipping a header of 'hdr_len' bytes at the beginning of 'buf'.
+ *
+ * This function does not validate the attribute's length. */
+const struct nlattr *
+nl_attr_find(const struct ofpbuf *buf, size_t hdr_len, uint16_t type)
+{
+ const uint8_t *start = (const uint8_t *) buf->data + hdr_len;
+ return nl_attr_find__((const struct nlattr *) start, buf->size - hdr_len,
+ type);
+}
+
+/* Returns the first Netlink attribute within 'nla' with the specified
+ * 'type'.
+ *
+ * This function does not validate the attribute's length. */
+const struct nlattr *
+nl_attr_find_nested(const struct nlattr *nla, uint16_t type)
+{
+ return nl_attr_find__(nl_attr_get(nla), nl_attr_get_size(nla), type);
+}