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+/*-
+ * Copyright (c) 1980, 1986, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#ifndef _USER_ROUTE_H_
+#define _USER_ROUTE_H_
+
+/*
+ * Kernel resident routing tables.
+ *
+ * The routing tables are initialized when interface addresses
+ * are set by making entries for all directly connected interfaces.
+ */
+
+/*
+ * A route consists of a destination address and a reference
+ * to a routing entry. These are often held by protocols
+ * in their control blocks, e.g. inpcb.
+ */
+
+struct sctp_route {
+ struct sctp_rtentry *ro_rt;
+ struct sockaddr ro_dst;
+};
+
+/*
+ * These numbers are used by reliable protocols for determining
+ * retransmission behavior and are included in the routing structure.
+ */
+struct sctp_rt_metrics_lite {
+ uint32_t rmx_mtu; /* MTU for this path */
+#if 0
+ u_long rmx_expire; /* lifetime for route, e.g. redirect */
+ u_long rmx_pksent; /* packets sent using this route */
+#endif
+};
+
+/*
+ * We distinguish between routes to hosts and routes to networks,
+ * preferring the former if available. For each route we infer
+ * the interface to use from the gateway address supplied when
+ * the route was entered. Routes that forward packets through
+ * gateways are marked so that the output routines know to address the
+ * gateway rather than the ultimate destination.
+ */
+struct sctp_rtentry {
+#if 0
+ struct radix_node rt_nodes[2]; /* tree glue, and other values */
+ /*
+ * XXX struct rtentry must begin with a struct radix_node (or two!)
+ * because the code does some casts of a 'struct radix_node *'
+ * to a 'struct rtentry *'
+ */
+#define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key)))
+#define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask)))
+ struct sockaddr *rt_gateway; /* value */
+ u_long rt_flags; /* up/down?, host/net */
+#endif
+ struct ifnet *rt_ifp; /* the answer: interface to use */
+ struct ifaddr *rt_ifa; /* the answer: interface address to use */
+ struct sctp_rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
+ long rt_refcnt; /* # held references */
+#if 0
+ struct sockaddr *rt_genmask; /* for generation of cloned routes */
+ caddr_t rt_llinfo; /* pointer to link level info cache */
+ struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
+ struct rtentry *rt_parent; /* cloning parent of this route */
+#endif
+ struct mtx rt_mtx; /* mutex for routing entry */
+};
+
+#define RT_LOCK_INIT(_rt) mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
+#define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx)
+#define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx)
+#define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx)
+#define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
+
+#define RT_ADDREF(_rt) do { \
+ RT_LOCK_ASSERT(_rt); \
+ KASSERT((_rt)->rt_refcnt >= 0, \
+ ("negative refcnt %ld", (_rt)->rt_refcnt)); \
+ (_rt)->rt_refcnt++; \
+} while (0)
+#define RT_REMREF(_rt) do { \
+ RT_LOCK_ASSERT(_rt); \
+ KASSERT((_rt)->rt_refcnt > 0, \
+ ("bogus refcnt %ld", (_rt)->rt_refcnt)); \
+ (_rt)->rt_refcnt--; \
+} while (0)
+#define RTFREE_LOCKED(_rt) do { \
+ if ((_rt)->rt_refcnt <= 1) { \
+ rtfree(_rt); \
+ } else { \
+ RT_REMREF(_rt); \
+ RT_UNLOCK(_rt); \
+ } \
+ /* guard against invalid refs */ \
+ _rt = NULL; \
+ } while (0)
+#define RTFREE(_rt) do { \
+ RT_LOCK(_rt); \
+ RTFREE_LOCKED(_rt); \
+} while (0)
+#endif