enum { OFPROTO_POSTPONE = 1 << 16 };
BUILD_ASSERT_DECL(OFPROTO_POSTPONE < OFPERR_OFS);
-int ofproto_flow_mod(struct ofproto *, const struct ofputil_flow_mod *);
+int ofproto_flow_mod(struct ofproto *, struct ofputil_flow_mod *);
void ofproto_add_flow(struct ofproto *, const struct match *,
unsigned int priority,
const struct ofpact *ofpacts, size_t ofpacts_len);