Function rib_decompose_notification

freebsd/net/route/route_helpers.c:346–384

* Decompose multipath cmd info @rc into a list of add/del/change * single-path operations, calling @cb callback for each operation. * Assumes at least one of the nexthops in @rc is multipath. */

 * Assumes at least one of the nexthops in @rc is multipath.
 */
void
rib_decompose_notification(struct rib_cmd_info *rc, route_notification_t *cb,
    void *cbdata)
{
	struct weightened_nhop *wn;
	uint32_t num_nhops;
	struct rib_cmd_info rc_new;

	rc_new = *rc;
	DPRINTF("cb=%p cmd=%d nh_old=%p nh_new=%p",
	    cb, rc->cmd, rc->nh_old, rc->nh_new);
	switch (rc->rc_cmd) {
	case RTM_ADD:
		if (!NH_IS_NHGRP(rc->rc_nh_new))
			return;
		wn = nhgrp_get_nhops((struct nhgrp_object *)rc->rc_nh_new, &num_nhops);
		for (uint32_t i = 0; i < num_nhops; i++) {
			rc_new.rc_nh_new = wn[i].nh;
			rc_new.rc_nh_weight = wn[i].weight;
			cb(&rc_new, cbdata);
		}
		break;
	case RTM_DELETE:
		if (!NH_IS_NHGRP(rc->rc_nh_old))
			return;
		wn = nhgrp_get_nhops((struct nhgrp_object *)rc->rc_nh_old, &num_nhops);
		for (uint32_t i = 0; i < num_nhops; i++) {
			rc_new.rc_nh_old = wn[i].nh;
			rc_new.rc_nh_weight = wn[i].weight;
			cb(&rc_new, cbdata);
		}
		break;
	case RTM_CHANGE:
		if (!NH_IS_NHGRP(rc->rc_nh_old) && !NH_IS_NHGRP(rc->rc_nh_new))
			return;
		decompose_change_notification(rc, cb, cbdata);
		break;
	}
}
#endif