re_jbuf_free
m->m_ext.ext_free = re_jbuf_free;
SLIST_INIT(&ldata->re_jbuf_free);
SLIST_INSERT_HEAD(&ldata->re_jbuf_free, jbuf, re_link);
jbuf = SLIST_FIRST(&ldata->re_jbuf_free);
SLIST_REMOVE_HEAD(&ldata->re_jbuf_free, re_link);
static void re_jbuf_free(void *);
SLIST_INSERT_HEAD(&ldata->re_jbuf_free, jbuf, re_link);
SLIST_HEAD(, re_jbuf) re_jbuf_free;