357 lines
13 KiB
C
357 lines
13 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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* @(#)route.h 8.4 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _NET_ROUTE_H_
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#define _NET_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 route {
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struct 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 rt_metrics_lite {
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u_long rmx_mtu; /* MTU for this path */
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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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};
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struct rt_metrics {
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u_long rmx_locks; /* Kernel must leave these values alone */
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u_long rmx_mtu; /* MTU for this path */
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u_long rmx_hopcount; /* max hops expected */
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u_long rmx_expire; /* lifetime for route, e.g. redirect */
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u_long rmx_recvpipe; /* inbound delay-bandwidth product */
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u_long rmx_sendpipe; /* outbound delay-bandwidth product */
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u_long rmx_ssthresh; /* outbound gateway buffer limit */
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u_long rmx_rtt; /* estimated round trip time */
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u_long rmx_rttvar; /* estimated rtt variance */
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u_long rmx_pksent; /* packets sent using this route */
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u_long rmx_filler[4]; /* will be used for T/TCP later */
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};
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/*
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* rmx_rtt and rmx_rttvar are stored as microseconds;
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* RTTTOPRHZ(rtt) converts to a value suitable for use
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* by a protocol slowtimo counter.
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*/
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#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
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#define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
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/*
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* XXX kernel function pointer `rt_output' is visible to applications.
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*/
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struct mbuf;
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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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#ifndef RNF_NORMAL
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#include <net/radix.h>
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#endif
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struct rtentry {
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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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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 rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
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long rt_refcnt; /* # held references */
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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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#ifdef _KERNEL
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/* XXX ugly, user apps use this definition but don't have a mtx def */
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struct mtx rt_mtx; /* mutex for routing entry */
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#endif
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};
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/*
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* Following structure necessary for 4.3 compatibility;
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* We should eventually move it to a compat file.
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*/
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struct ortentry {
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u_long rt_hash; /* to speed lookups */
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struct sockaddr rt_dst; /* key */
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struct sockaddr rt_gateway; /* value */
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short rt_flags; /* up/down?, host/net */
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short rt_refcnt; /* # held references */
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u_long rt_use; /* raw # packets forwarded */
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struct ifnet *rt_ifp; /* the answer: interface to use */
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};
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#define rt_use rt_rmx.rmx_pksent
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#define RTF_UP 0x1 /* route usable */
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#define RTF_GATEWAY 0x2 /* destination is a gateway */
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#define RTF_HOST 0x4 /* host entry (net otherwise) */
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#define RTF_REJECT 0x8 /* host or net unreachable */
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#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
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#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
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#define RTF_DONE 0x40 /* message confirmed */
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/* 0x80 unused, was RTF_DELCLONE */
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#define RTF_CLONING 0x100 /* generate new routes on use */
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#define RTF_XRESOLVE 0x200 /* external daemon resolves name */
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#define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */
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#define RTF_STATIC 0x800 /* manually added */
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#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
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#define RTF_PROTO2 0x4000 /* protocol specific routing flag */
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#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
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/* XXX: temporary to stay API/ABI compatible with userland */
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#ifndef _KERNEL
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#define RTF_PRCLONING 0x10000 /* unused, for compatibility */
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#endif
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#define RTF_WASCLONED 0x20000 /* route generated through cloning */
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#define RTF_PROTO3 0x40000 /* protocol specific routing flag */
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/* 0x80000 unused */
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#define RTF_PINNED 0x100000 /* future use */
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#define RTF_LOCAL 0x200000 /* route represents a local address */
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#define RTF_BROADCAST 0x400000 /* route represents a bcast address */
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#define RTF_MULTICAST 0x800000 /* route represents a mcast address */
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/* 0x1000000 and up unassigned */
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/*
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* Routing statistics.
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*/
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struct rtstat {
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short rts_badredirect; /* bogus redirect calls */
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short rts_dynamic; /* routes created by redirects */
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short rts_newgateway; /* routes modified by redirects */
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short rts_unreach; /* lookups which failed */
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short rts_wildcard; /* lookups satisfied by a wildcard */
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};
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/*
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* Structures for routing messages.
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*/
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struct rt_msghdr {
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u_short rtm_msglen; /* to skip over non-understood messages */
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u_char rtm_version; /* future binary compatibility */
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u_char rtm_type; /* message type */
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u_short rtm_index; /* index for associated ifp */
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int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
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int rtm_addrs; /* bitmask identifying sockaddrs in msg */
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pid_t rtm_pid; /* identify sender */
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int rtm_seq; /* for sender to identify action */
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int rtm_errno; /* why failed */
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int rtm_use; /* from rtentry */
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u_long rtm_inits; /* which metrics we are initializing */
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struct rt_metrics rtm_rmx; /* metrics themselves */
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};
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#define RTM_VERSION 5 /* Up the ante and ignore older versions */
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/*
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* Message types.
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*/
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#define RTM_ADD 0x1 /* Add Route */
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#define RTM_DELETE 0x2 /* Delete Route */
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#define RTM_CHANGE 0x3 /* Change Metrics or flags */
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#define RTM_GET 0x4 /* Report Metrics */
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#define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
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#define RTM_REDIRECT 0x6 /* Told to use different route */
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#define RTM_MISS 0x7 /* Lookup failed on this address */
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#define RTM_LOCK 0x8 /* fix specified metrics */
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#define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
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#define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
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#define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
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#define RTM_NEWADDR 0xc /* address being added to iface */
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#define RTM_DELADDR 0xd /* address being removed from iface */
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#define RTM_IFINFO 0xe /* iface going up/down etc. */
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#define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
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#define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
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#define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */
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/*
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* Bitmask values for rtm_inits and rmx_locks.
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*/
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#define RTV_MTU 0x1 /* init or lock _mtu */
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#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
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#define RTV_EXPIRE 0x4 /* init or lock _expire */
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#define RTV_RPIPE 0x8 /* init or lock _recvpipe */
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#define RTV_SPIPE 0x10 /* init or lock _sendpipe */
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#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
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#define RTV_RTT 0x40 /* init or lock _rtt */
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#define RTV_RTTVAR 0x80 /* init or lock _rttvar */
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/*
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* Bitmask values for rtm_addrs.
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*/
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#define RTA_DST 0x1 /* destination sockaddr present */
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#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
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#define RTA_NETMASK 0x4 /* netmask sockaddr present */
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#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
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#define RTA_IFP 0x10 /* interface name sockaddr present */
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#define RTA_IFA 0x20 /* interface addr sockaddr present */
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#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
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#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
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/*
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* Index offsets for sockaddr array for alternate internal encoding.
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*/
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#define RTAX_DST 0 /* destination sockaddr present */
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#define RTAX_GATEWAY 1 /* gateway sockaddr present */
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#define RTAX_NETMASK 2 /* netmask sockaddr present */
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#define RTAX_GENMASK 3 /* cloning mask sockaddr present */
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#define RTAX_IFP 4 /* interface name sockaddr present */
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#define RTAX_IFA 5 /* interface addr sockaddr present */
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#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
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#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
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#define RTAX_MAX 8 /* size of array to allocate */
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struct rt_addrinfo {
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int rti_addrs;
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struct sockaddr *rti_info[RTAX_MAX];
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int rti_flags;
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struct ifaddr *rti_ifa;
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struct ifnet *rti_ifp;
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};
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/*
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* This macro returns the size of a struct sockaddr when passed
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* through a routing socket. Basically we round up sa_len to
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* a multiple of sizeof(long), with a minimum of sizeof(long).
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* The check for a NULL pointer is just a convenience, probably never used.
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* The case sa_len == 0 should only apply to empty structures.
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*/
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#define SA_SIZE(sa) \
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( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \
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sizeof(long) : \
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1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
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#ifdef _KERNEL
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#define RT_LOCK_INIT(_rt) \
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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 = 0; \
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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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extern struct radix_node_head *rt_tables[AF_MAX+1];
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struct ifmultiaddr;
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int rt_getifa(struct rt_addrinfo *);
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void rt_ifannouncemsg(struct ifnet *, int);
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void rt_ifmsg(struct ifnet *);
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void rt_missmsg(int, struct rt_addrinfo *, int, int);
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void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
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void rt_newmaddrmsg(int, struct ifmultiaddr *);
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int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
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/*
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* Note the following locking behavior:
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*
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* rtalloc_ign() and rtalloc() return ro->ro_rt unlocked
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*
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* rtalloc1() returns a locked rtentry
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*
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* rtfree() and RTFREE_LOCKED() require a locked rtentry
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*
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* RTFREE() uses an unlocked entry.
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*/
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void rtalloc_ign(struct route *ro, u_long ignflags);
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void rtalloc(struct route *ro); /* XXX deprecated, use rtalloc_ign(ro, 0) */
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struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
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int rtexpunge(struct rtentry *);
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void rtfree(struct rtentry *);
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int rtinit(struct ifaddr *, int, int);
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int rtioctl(u_long, caddr_t);
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void rtredirect(struct sockaddr *, struct sockaddr *,
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struct sockaddr *, int, struct sockaddr *);
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int rtrequest(int, struct sockaddr *,
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struct sockaddr *, struct sockaddr *, int, struct rtentry **);
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int rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
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int rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
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#endif
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#endif
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