flowi_mark
if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
fl.flowi_mark = be32_to_cpu(t->parms.o_key);
(fl->flowi_mark & pol->mark.m) != pol->mark.v ||
mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
fl->flowi_mark = skb->mark;
fl1->flowi_mark = fl->flowi_mark;