Differential D26449 Diff 77806 sys/net/route/route_helpers.c

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sys/net/route/route_helpers.c

Show First 20 Lines • Show All 125 Lines • ▼ Show 20 Lines	nh = fib6_lookup(fibnum, &a->sin6_addr, a->sin6_scope_id,
flags, flowid);		flags, flowid);
break;		break;
}		}
#endif		#endif
}		}

return (nh);		return (nh);
}		}

		#ifdef ROUTE_MPATH
		static void
		decompose_change_notification(struct rib_cmd_info rc, route_notification_t cb,
		void *cbdata)
		{
		uint32_t num_old, num_new;
		uint32_t nh_idx_old, nh_idx_new;
		struct weightened_nhop wn_old, wn_new;
		struct weightened_nhop tmp = { NULL, 0 };
		uint32_t idx_old = 0, idx_new = 0;

		struct rib_cmd_info rc_del = { .rc_cmd = RTM_DELETE, .rc_rt = rc->rc_rt };
		struct rib_cmd_info rc_add = { .rc_cmd = RTM_ADD, .rc_rt = rc->rc_rt };

		if (NH_IS_NHGRP(rc->rc_nh_old)) {
		wn_old = nhgrp_get_nhops((struct nhgrp_object *)rc->rc_nh_old, &num_old);
		} else {
		tmp.nh = rc->rc_nh_old;
		tmp.weight = rc->rc_nh_weight;
		wn_old = &tmp;
		num_old = 1;
		}
		if (NH_IS_NHGRP(rc->rc_nh_new)) {
		wn_new = nhgrp_get_nhops((struct nhgrp_object *)rc->rc_nh_new, &num_new);
		} else {
		tmp.nh = rc->rc_nh_new;
		tmp.weight = rc->rc_nh_weight;
		wn_new = &tmp;
		num_new = 1;
		}

		/* Use the fact that each @wn array is sorted */
		/*
		* Want to convert into set of add and delete operations
		* [1] -> [1, 2] = A{2}
		* [2] -> [1, 2] = A{1}
		* [1, 2, 4]->[1, 3, 4] = A{2}, D{3}
		* [1, 2, 4]->[1, 4] = D{2}
		* [1, 2, 4] -> [3, 4] = D{1}, C{2,3} OR C{1,3}, D{2} OR D{1},D{2},A{3}
		* [1, 2] -> [3, 4] =
		*
		*/
		idx_old = 0;
		while ((idx_old < num_old) && (idx_new < num_new)) {
		nh_idx_old = wn_old[idx_old].nh->nh_priv->nh_idx;
		nh_idx_new = wn_new[idx_new].nh->nh_priv->nh_idx;

		if (nh_idx_old == nh_idx_new) {
		if (wn_old[idx_old].weight != wn_new[idx_new].weight) {
		/* Update weight by providing del/add notifications */
		rc_del.rc_nh_old = wn_old[idx_old].nh;
		rc_del.rc_nh_weight = wn_old[idx_old].weight;
		cb(&rc_del, cbdata);

		rc_add.rc_nh_new = wn_new[idx_new].nh;
		rc_add.rc_nh_weight = wn_new[idx_new].weight;
		cb(&rc_add, cbdata);
		}
		idx_old++;
		idx_new++;
		} else if (nh_idx_old < nh_idx_new) {
		/*
		* [1, ~2~, 4], [1, ~3~, 4]
		* [1, ~2~, 5], [1, ~3~, 4]
		* [1, ~2~], [1, ~3~, 4]
		*/
		if ((idx_old + 1 >= num_old) \|\|
		(wn_old[idx_old + 1].nh->nh_priv->nh_idx > nh_idx_new)) {
		/* Add new unless the next old item is still <= new */
		rc_add.rc_nh_new = wn_new[idx_new].nh;
		rc_add.rc_nh_weight = wn_new[idx_new].weight;
		cb(&rc_add, cbdata);
		idx_new++;
		}
		/* In any case, delete current old */
		rc_del.rc_nh_old = wn_old[idx_old].nh;
		rc_del.rc_nh_weight = wn_old[idx_old].weight;
		cb(&rc_del, cbdata);
		idx_old++;
		} else {
		/*
		* nh_idx_old > nh_idx_new
		*
		* [1, ~3~, 4], [1, ~2~, 4]
		* [1, ~3~, 5], [1, ~2~, 4]
		* [1, ~3~, 4], [1, ~2~]
		*/
		if ((idx_new + 1 >= num_new) \|\|
		(wn_new[idx_new + 1].nh->nh_priv->nh_idx > nh_idx_old)) {
		/* No next item or next item is > current one */
		rc_add.rc_nh_new = wn_new[idx_new].nh;
		rc_add.rc_nh_weight = wn_new[idx_new].weight;
		cb(&rc_add, cbdata);
		idx_new++;
		}
		/* In any case, delete current old */
		rc_del.rc_nh_old = wn_old[idx_old].nh;
		rc_del.rc_nh_weight = wn_old[idx_old].weight;
		cb(&rc_del, cbdata);
		idx_old++;
		}
		}

		while (idx_old < num_old) {
		rc_del.rc_nh_old = wn_old[idx_old].nh;
		rc_del.rc_nh_weight = wn_old[idx_old].weight;
		cb(&rc_del, cbdata);
		idx_old++;
		}

		while (idx_new < num_new) {
		rc_add.rc_nh_new = wn_new[idx_new].nh;
		rc_add.rc_nh_weight = wn_new[idx_new].weight;
		cb(&rc_add, cbdata);
		idx_new++;
		}
		}

		/*
		* 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.
		*/
		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