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f4538e24b6
There are problems with global shared state and no API stability guarantees, and we can't rely on distros shipping the fixes we need. Both firefox and Chrome bundle their own copies too. Imported from https://github.com/sctplab/usrsctp, commit 547d3b46c64876c0336b9eef297fda58dbe1adaf Date: Thu Jul 23 21:49:32 2020 +0200 Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/870 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1465>
131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/*-
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#ifndef _USER_ROUTE_H_
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#define _USER_ROUTE_H_
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/*
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* Kernel resident routing tables.
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*
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* The routing tables are initialized when interface addresses
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* are set by making entries for all directly connected interfaces.
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*/
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/*
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* A route consists of a destination address and a reference
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* to a routing entry. These are often held by protocols
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* in their control blocks, e.g. inpcb.
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*/
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struct sctp_route {
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struct sctp_rtentry *ro_rt;
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struct sockaddr ro_dst;
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};
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/*
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* These numbers are used by reliable protocols for determining
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* retransmission behavior and are included in the routing structure.
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*/
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struct sctp_rt_metrics_lite {
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uint32_t rmx_mtu; /* MTU for this path */
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#if 0
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u_long rmx_expire; /* lifetime for route, e.g. redirect */
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u_long rmx_pksent; /* packets sent using this route */
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#endif
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};
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/*
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* We distinguish between routes to hosts and routes to networks,
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* preferring the former if available. For each route we infer
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* the interface to use from the gateway address supplied when
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* the route was entered. Routes that forward packets through
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* gateways are marked so that the output routines know to address the
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* gateway rather than the ultimate destination.
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*/
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struct sctp_rtentry {
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#if 0
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struct radix_node rt_nodes[2]; /* tree glue, and other values */
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/*
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* XXX struct rtentry must begin with a struct radix_node (or two!)
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* because the code does some casts of a 'struct radix_node *'
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* to a 'struct rtentry *'
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*/
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#define rt_key(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_key)))
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#define rt_mask(r) (*((struct sockaddr **)(&(r)->rt_nodes->rn_mask)))
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struct sockaddr *rt_gateway; /* value */
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u_long rt_flags; /* up/down?, host/net */
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#endif
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struct ifnet *rt_ifp; /* the answer: interface to use */
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struct ifaddr *rt_ifa; /* the answer: interface address to use */
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struct sctp_rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
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long rt_refcnt; /* # held references */
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#if 0
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struct sockaddr *rt_genmask; /* for generation of cloned routes */
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caddr_t rt_llinfo; /* pointer to link level info cache */
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struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
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struct rtentry *rt_parent; /* cloning parent of this route */
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#endif
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struct mtx rt_mtx; /* mutex for routing entry */
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};
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#define RT_LOCK_INIT(_rt) mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
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#define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx)
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#define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx)
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#define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx)
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#define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED)
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#define RT_ADDREF(_rt) do { \
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RT_LOCK_ASSERT(_rt); \
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KASSERT((_rt)->rt_refcnt >= 0, \
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("negative refcnt %ld", (_rt)->rt_refcnt)); \
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(_rt)->rt_refcnt++; \
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} while (0)
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#define RT_REMREF(_rt) do { \
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RT_LOCK_ASSERT(_rt); \
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KASSERT((_rt)->rt_refcnt > 0, \
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("bogus refcnt %ld", (_rt)->rt_refcnt)); \
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(_rt)->rt_refcnt--; \
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} while (0)
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#define RTFREE_LOCKED(_rt) do { \
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if ((_rt)->rt_refcnt <= 1) { \
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rtfree(_rt); \
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} else { \
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RT_REMREF(_rt); \
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RT_UNLOCK(_rt); \
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} \
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/* guard against invalid refs */ \
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_rt = NULL; \
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} while (0)
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#define RTFREE(_rt) do { \
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RT_LOCK(_rt); \
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RTFREE_LOCKED(_rt); \
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} while (0)
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#endif
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