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/* $NetBSD: route.h,v 1.132 2022/09/20 02:23:37 knakahara Exp $ */
/*
* 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.
* 3. 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.
*
* @(#)route.h 8.5 (Berkeley) 2/8/95
*/
#ifndef _NET_ROUTE_H_
#define _NET_ROUTE_H_
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/if.h>
#ifdef _KERNEL
#include <sys/rwlock.h>
#include <sys/condvar.h>
#include <sys/pserialize.h>
#include <sys/percpu.h>
#endif
#include <sys/psref.h>
#if !(defined(_KERNEL) || defined(_STANDALONE))
#include <stdbool.h>
#endif
/*
* 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 route {
struct rtentry *_ro_rt;
struct sockaddr *ro_sa;
uint64_t ro_rtcache_generation;
struct psref ro_psref;
int ro_bound;
};
/*
* These numbers are used by reliable protocols for determining
* retransmission behavior and are included in the routing structure.
*/
struct rt_metrics {
uint64_t rmx_locks; /* Kernel must leave these values alone */
uint64_t rmx_mtu; /* MTU for this path */
uint64_t rmx_hopcount; /* max hops expected */
uint64_t rmx_recvpipe; /* inbound delay-bandwidth product */
uint64_t rmx_sendpipe; /* outbound delay-bandwidth product */
uint64_t rmx_ssthresh; /* outbound gateway buffer limit */
uint64_t rmx_rtt; /* estimated round trip time */
uint64_t rmx_rttvar; /* estimated rtt variance */
time_t rmx_expire; /* lifetime for route, e.g. redirect */
time_t rmx_pksent; /* packets sent using this route */
};
/*
* rmx_rtt and rmx_rttvar are stored as microseconds;
* RTTTOPRHZ(rtt) converts to a value suitable for use
* by a protocol slowtimo counter.
*/
#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
#define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
/*
* 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.
*/
#ifndef RNF_NORMAL
#include <net/radix.h>
#endif
struct rtentry {
struct radix_node rt_nodes[2]; /* tree glue, and other values */
#define rt_mask(r) ((const struct sockaddr *)((r)->rt_nodes->rn_mask))
struct sockaddr *rt_gateway; /* value */
int rt_flags; /* up/down?, host/net */
int rt_refcnt; /* # held references */
uint64_t rt_use; /* raw # packets forwarded */
struct ifnet *rt_ifp; /* the answer: interface to use */
struct ifaddr *rt_ifa; /* the answer: interface to use */
uint32_t rt_ifa_seqno;
void * rt_llinfo; /* pointer to link level info cache */
struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */
struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
LIST_HEAD(, rttimer) rt_timer; /* queue of timeouts for misc funcs */
struct rtentry *rt_parent; /* parent of cloned route */
struct sockaddr *_rt_key;
struct sockaddr *rt_tag; /* route tagging info */
#ifdef _KERNEL
kcondvar_t rt_cv;
struct psref_target rt_psref;
SLIST_ENTRY(rtentry) rt_free; /* queue of deferred frees */
#endif
};
static __inline const struct sockaddr *
rt_getkey(const struct rtentry *rt)
{
return rt->_rt_key;
}
/*
* Following structure necessary for 4.3 compatibility;
* We should eventually move it to a compat file.
*/
struct ortentry {
uint32_t rt_hash; /* to speed lookups */
struct sockaddr rt_dst; /* key */
struct sockaddr rt_gateway; /* value */
int16_t rt_flags; /* up/down?, host/net */
int16_t rt_refcnt; /* # held references */
uint32_t rt_use; /* raw # packets forwarded */
struct ifnet *rt_ifp; /* the answer: interface to use */
};
#define RTF_UP 0x1 /* route usable */
#define RTF_GATEWAY 0x2 /* destination is a gateway */
#define RTF_HOST 0x4 /* host entry (net otherwise) */
#define RTF_REJECT 0x8 /* host or net unreachable */
#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
#define RTF_DONE 0x40 /* message confirmed */
#define RTF_MASK 0x80 /* subnet mask present */
// #define RTF_CLONING 0x100 /* generate new routes on use */
#define RTF_CONNECTED 0x100 /* hosts on this route are neighbours */
// #define RTF_XRESOLVE 0x200 /* external daemon resolves name */
// #define RTF_LLINFO 0x400 /* generated by ARP or NDP */
#define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
#define RTF_STATIC 0x800 /* manually added */
#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
// #define RTF_CLONED 0x2000 /* this is a cloned route */
#define RTF_PROTO2 0x4000 /* protocol specific routing flag */
#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
#define RTF_SRC 0x10000 /* route has fixed source address */
#define RTF_ANNOUNCE 0x20000 /* announce new ARP or NDP entry */
#define RTF_LOCAL 0x40000 /* route represents a local address */
#define RTF_BROADCAST 0x80000 /* route represents a bcast address */
#define RTF_UPDATING 0x100000 /* route is updating */
/*
* The flag is nevert set to rt_flags. It just tells rtrequest1 to set a passed
* ifa to rt_ifa (via rti_ifa) and not replace rt_ifa in ifa_rtrequest.
*/
#define RTF_DONTCHANGEIFA 0x200000 /* suppress rt_ifa replacement */
/*
* 0x400 is exposed to userland just for backward compatibility. For that
* purpose, it should be shown as LLINFO.
*/
#define RTFBITS "\020\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE" \
"\010MASK_PRESENT\011CONNECTED\012XRESOLVE\013LLINFO\014STATIC" \
"\015BLACKHOLE\016CLONED\017PROTO2\020PROTO1\021SRC\022ANNOUNCE" \
"\023LOCAL\024BROADCAST\025UPDATING"
/*
* Routing statistics.
*/
struct rtstat {
uint64_t rts_badredirect; /* bogus redirect calls */
uint64_t rts_dynamic; /* routes created by redirects */
uint64_t rts_newgateway; /* routes modified by redirects */
uint64_t rts_unreach; /* lookups which failed */
uint64_t rts_wildcard; /* lookups satisfied by a wildcard */
};
/*
* Structures for routing messages. By forcing the first member to be aligned
* at a 64-bit boundary, we also force the size to be a multiple of 64-bits.
*/
#if !defined(_KERNEL) || !defined(COMPAT_RTSOCK)
/*
* If we aren't being compiled for backwards compatibility, enforce 64-bit
* alignment so any routing message is the same regardless if the kernel
* is an ILP32 or LP64 kernel.
*/
#define __align64 __aligned(sizeof(uint64_t))
#else
#define __align64
#endif
struct rt_msghdr {
u_short rtm_msglen __align64;
/* to skip over non-understood messages */
u_char rtm_version; /* future binary compatibility */
u_char rtm_type; /* message type */
u_short rtm_index; /* index for associated ifp */
int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
int rtm_addrs; /* bitmask identifying sockaddrs in msg */
pid_t rtm_pid; /* identify sender */
int rtm_seq; /* for sender to identify action */
int rtm_errno; /* why failed */
int rtm_use; /* from rtentry */
int rtm_inits; /* which metrics we are initializing */
struct rt_metrics rtm_rmx __align64;
/* metrics themselves */
};
#undef __align64
#define RTM_VERSION 4 /* Up the ante and ignore older versions */
#define RTM_ADD 0x1 /* Add Route */
#define RTM_DELETE 0x2 /* Delete Route */
#define RTM_CHANGE 0x3 /* Change Metrics or flags */
#define RTM_GET 0x4 /* Report Metrics */
#define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
#define RTM_REDIRECT 0x6 /* Told to use different route */
#define RTM_MISS 0x7 /* Lookup failed on this address */
#define RTM_LOCK 0x8 /* fix specified metrics */
#define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
#define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
// #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
#define RTM_ONEWADDR 0xc /* Old (pre-8.0) RTM_NEWADDR message */
#define RTM_ODELADDR 0xd /* Old (pre-8.0) RTM_DELADDR message */
#define RTM_OOIFINFO 0xe /* Old (pre-1.5) RTM_IFINFO message */
#define RTM_OIFINFO 0xf /* Old (pre-64bit time) RTM_IFINFO message */
#define RTM_IFANNOUNCE 0x10 /* iface arrival/departure */
#define RTM_IEEE80211 0x11 /* IEEE80211 wireless event */
#define RTM_SETGATE 0x12 /* set prototype gateway for clones
* (see example in arp_rtrequest).
*/
#define RTM_LLINFO_UPD 0x13 /* indication to ARP/NDP/etc. that link-layer
* address has changed
*/
#define RTM_IFINFO 0x14 /* iface/link going up/down etc. */
#define RTM_OCHGADDR 0x15 /* Old (pre-8.0) RTM_CHGADDR message */
#define RTM_NEWADDR 0x16 /* address being added to iface */
#define RTM_DELADDR 0x17 /* address being removed from iface */
#define RTM_CHGADDR 0x18 /* address properties changed */
#ifdef RTM_NAMES
static const char *rtm_names[] = {
"*none*", "add", "delete", "change", "get",
"losing", "redirect", "miss", "lock", "oldadd",
"olddel", "*resolve*", "onewaddr", "odeladdr", "ooifinfo",
"oifinfo", "ifannounce", "ieee80211", "setgate", "llinfo_upd",
"ifinfo", "ochgaddr", "newaddr", "deladdr", "chgaddr",
};
#endif
/*
* setsockopt defines used for the filtering.
*/
#define RO_MSGFILTER 1 /* array of which rtm_type to send to client */
#define RO_MISSFILTER 2 /* array of sockaddrs to match miss dst */
#define RO_FILTSA_MAX 30 /* maximum number of sockaddrs per filter */
#define RTV_MTU 0x1 /* init or lock _mtu */
#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
#define RTV_EXPIRE 0x4 /* init or lock _expire */
#define RTV_RPIPE 0x8 /* init or lock _recvpipe */
#define RTV_SPIPE 0x10 /* init or lock _sendpipe */
#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
#define RTV_RTT 0x40 /* init or lock _rtt */
#define RTV_RTTVAR 0x80 /* init or lock _rttvar */
#define RTVBITS "\020\1MTU\2HOPCOUNT\3EXPIRE\4RECVPIPE\5SENDPIPE" \
"\6SSTHRESH\7RTT\010RTTVAR"
/*
* Bitmask values for rtm_addr.
*/
#define RTA_DST 0x1 /* destination sockaddr present */
#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
#define RTA_NETMASK 0x4 /* netmask sockaddr present */
#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
#define RTA_IFP 0x10 /* interface name sockaddr present */
#define RTA_IFA 0x20 /* interface addr sockaddr present */
#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
#define RTA_TAG 0x100 /* route tag */
#define RTABITS "\020\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR" \
"\010BRD\011TAG"
/*
* Index offsets for sockaddr array for alternate internal encoding.
*/
#define RTAX_DST 0 /* destination sockaddr present */
#define RTAX_GATEWAY 1 /* gateway sockaddr present */
#define RTAX_NETMASK 2 /* netmask sockaddr present */
#define RTAX_GENMASK 3 /* cloning mask sockaddr present */
#define RTAX_IFP 4 /* interface name sockaddr present */
#define RTAX_IFA 5 /* interface addr sockaddr present */
#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
#define RTAX_TAG 8 /* route tag */
#define RTAX_MAX 9 /* size of array to allocate */
#define RT_ROUNDUP2(a, n) ((a) > 0 ? (1 + (((a) - 1U) | ((n) - 1))) : (n))
#define RT_ROUNDUP(a) RT_ROUNDUP2((a), sizeof(uint64_t))
#define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len))
struct rt_addrinfo {
int rti_addrs;
const struct sockaddr *rti_info[RTAX_MAX];
int rti_flags;
struct ifaddr *rti_ifa;
struct ifnet *rti_ifp;
};
struct route_cb {
int ip_count;
int ip6_count;
int unused1;
int mpls_count;
int any_count;
};
/*
* This structure, and the prototypes for the rt_timer_{init,remove_all,
* add,timer} functions all used with the kind permission of BSDI.
* These allow functions to be called for routes at specific times.
*/
struct rttimer {
TAILQ_ENTRY(rttimer) rtt_next; /* entry on timer queue */
LIST_ENTRY(rttimer) rtt_link; /* multiple timers per rtentry */
struct rttimer_queue *rtt_queue; /* back pointer to queue */
struct rtentry *rtt_rt; /* Back pointer to the route */
void (*rtt_func)(struct rtentry *, struct rttimer *);
time_t rtt_time; /* When this timer was registered */
};
struct rttimer_queue {
long rtq_timeout;
unsigned long rtq_count;
TAILQ_HEAD(, rttimer) rtq_head;
LIST_ENTRY(rttimer_queue) rtq_link;
};
struct rtbl;
typedef struct rtbl rtbl_t;
#ifdef _KERNEL
struct rtbl {
struct radix_node_head t_rnh;
};
struct rt_walkarg {
int w_op;
int w_arg;
int w_given;
int w_needed;
void * w_where;
int w_tmemsize;
int w_tmemneeded;
void * w_tmem;
};
#if 0
#define RT_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0)
#else
#define RT_DPRINTF(__fmt, ...) /* do nothing */
#endif
struct rtwalk {
int (*rw_f)(struct rtentry *, void *);
void *rw_v;
};
/*
* Global data specific to the routing socket.
*/
struct route_info {
struct sockaddr ri_dst;
struct sockaddr ri_src;
struct route_cb ri_cb;
int ri_maxqlen;
struct ifqueue ri_intrq;
void *ri_sih;
};
extern struct route_info route_info;
extern struct rtstat rtstat;
struct socket;
void rt_init(void);
int rt_timer_add(struct rtentry *,
void(*)(struct rtentry *, struct rttimer *),
struct rttimer_queue *);
unsigned long
rt_timer_count(struct rttimer_queue *);
void rt_timer_queue_change(struct rttimer_queue *, long);
struct rttimer_queue *
rt_timer_queue_create(u_int);
void rt_timer_queue_destroy(struct rttimer_queue *);
void rt_free(struct rtentry *);
void rt_unref(struct rtentry *);
int rt_update(struct rtentry *, struct rt_addrinfo *, void *);
int rt_update_prepare(struct rtentry *);
void rt_update_finish(struct rtentry *);
void rt_newmsg(const int, const struct rtentry *);
void rt_newmsg_dynamic(const int, const struct rtentry *);
struct rtentry *
rtalloc1(const struct sockaddr *, int);
int rtinit(struct ifaddr *, int, int);
void rtredirect(const struct sockaddr *, const struct sockaddr *,
const struct sockaddr *, int, const struct sockaddr *,
struct rtentry **);
int rtrequest(int, const struct sockaddr *,
const struct sockaddr *, const struct sockaddr *, int,
struct rtentry **);
int rtrequest1(int, struct rt_addrinfo *, struct rtentry **);
int rt_ifa_addlocal(struct ifaddr *);
int rt_ifa_remlocal(struct ifaddr *, struct ifaddr *);
struct ifaddr *
rt_get_ifa(struct rtentry *);
void rt_replace_ifa(struct rtentry *, struct ifaddr *);
int rt_setgate(struct rtentry *, const struct sockaddr *);
const struct sockaddr *
rt_settag(struct rtentry *, const struct sockaddr *);
struct sockaddr *
rt_gettag(const struct rtentry *);
int rt_check_reject_route(const struct rtentry *, const struct ifnet *);
void rt_delete_matched_entries(sa_family_t,
int (*)(struct rtentry *, void *), void *, bool);
void rt_replace_ifa_matched_entries(sa_family_t,
int (*)(struct rtentry *, void *), void *, struct ifaddr *);
int rt_walktree(sa_family_t, int (*)(struct rtentry *, void *), void *);
static __inline void
rt_assert_referenced(const struct rtentry *rt)
{
KASSERT(rt->rt_refcnt > 0);
}
void rtcache_copy(struct route *, struct route *);
void rtcache_free(struct route *);
struct rtentry *
rtcache_init(struct route *);
struct rtentry *
rtcache_init_noclone(struct route *);
struct rtentry *
rtcache_lookup2(struct route *, const struct sockaddr *, int,
int *);
int rtcache_setdst(struct route *, const struct sockaddr *);
struct rtentry *
rtcache_update(struct route *, int);
static __inline void
rtcache_invariants(const struct route *ro)
{
KASSERT(ro->ro_sa != NULL || ro->_ro_rt == NULL);
}
static __inline struct rtentry *
rtcache_lookup1(struct route *ro, const struct sockaddr *dst, int clone)
{
int hit;
return rtcache_lookup2(ro, dst, clone, &hit);
}
static __inline struct rtentry *
rtcache_lookup(struct route *ro, const struct sockaddr *dst)
{
return rtcache_lookup1(ro, dst, 1);
}
static __inline const struct sockaddr *
rtcache_getdst(const struct route *ro)
{
rtcache_invariants(ro);
return ro->ro_sa;
}
struct rtentry *
rtcache_validate(struct route *);
void rtcache_unref(struct rtentry *, struct route *);
percpu_t *
rtcache_percpu_alloc(void);
static inline struct route *
rtcache_percpu_getref(percpu_t *pc)
{
return *(struct route **)percpu_getref(pc);
}
static inline void
rtcache_percpu_putref(percpu_t *pc)
{
percpu_putref(pc);
}
/* rtsock */
void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
void rt_ifannouncemsg(struct ifnet *, int);
void rt_ifmsg(struct ifnet *);
void rt_missmsg(int, const struct rt_addrinfo *, int, int);
struct mbuf *
rt_msg1(int, struct rt_addrinfo *, void *, int);
int rt_msg3(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
void rt_addrmsg(int, struct ifaddr *);
void rt_addrmsg_src(int, struct ifaddr *, const struct sockaddr *);
void rt_addrmsg_rt(int, struct ifaddr *, int, struct rtentry *);
void route_enqueue(struct mbuf *, int);
struct llentry;
void rt_clonedmsg(int, const struct sockaddr *, const struct sockaddr *,
const uint8_t *, const struct ifnet *);
void rt_setmetrics(void *, struct rtentry *);
/* rtbl */
int rt_addaddr(rtbl_t *, struct rtentry *, const struct sockaddr *);
void rt_assert_inactive(const struct rtentry *);
struct rtentry *
rt_deladdr(rtbl_t *, const struct sockaddr *,
const struct sockaddr *);
rtbl_t *rt_gettable(sa_family_t);
int rt_inithead(rtbl_t **, int);
struct rtentry *
rt_lookup(rtbl_t *, const struct sockaddr *,
const struct sockaddr *);
struct rtentry *
rt_matchaddr(rtbl_t *, const struct sockaddr *);
int rt_refines(const struct sockaddr *, const struct sockaddr *);
int rtbl_walktree(sa_family_t, int (*)(struct rtentry *, void *), void *);
struct rtentry *
rtbl_search_matched_entry(sa_family_t,
int (*)(struct rtentry *, void *), void *);
void rtbl_init(void);
void sysctl_net_route_setup(struct sysctllog **, int, const char *);
#endif /* _KERNEL */
#endif /* !_NET_ROUTE_H_ */
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