/* $NetBSD: route.h,v 1.123.2.2 2019/09/24 03:10:35 martin 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 #include #include #include #ifdef _KERNEL #include #include #include #include #endif #include #if !(defined(_KERNEL) || defined(_STANDALONE)) #include #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 #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 compatiblity, 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 */ /* * setsockopt defines used for the filtering. */ #define RO_MSGFILTER 1 /* array of which rtm_type to send to client */ #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 *); 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 rtrequest_newmsg(const int, const struct sockaddr *, const struct sockaddr *, const struct sockaddr *, const int); 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 *); 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 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_ */