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freebsd-dev/sys/net/route.h
Gleb Smirnoff bf9840512a When ip_output()/ip6_output() is supplied a struct route *ro argument, 
it skips FLOWTABLE lookup. However, the non-NULL ro has dual meaning
here: it may be supplied to provide route, and it may be supplied to
store and return to caller the route that ip_output()/ip6_output()
finds. In the latter case skipping FLOWTABLE lookup is pessimisation.

The difference between struct route filled by FLOWTABLE and filled
by rtalloc() family is that the former doesn't hold a reference on
its rtentry. Reference is hold by flow entry, and it is about to
be released in future. Thus, route filled by FLOWTABLE shouldn't
be passed to RTFREE() macro.

- Introduce new flag for struct route/route_in6, that marks route
  not holding a reference on rtentry.
- Introduce new macro RO_RTFREE() that cleans up a struct route
  depending on its kind.
- All callers to ip_output()/ip6_output() that do supply non-NULL
  but empty route should use RO_RTFREE() to free results of
  lookup.
- ip_output()/ip6_output() now do FLOWTABLE lookup always when
  ro->ro_rt == NULL.

Tested by:	tuexen (SCTP part)
2012-07-04 07:37:53 +00:00

430 lines
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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.
*
* @(#)route.h 8.4 (Berkeley) 1/9/95
* $FreeBSD$
*/
#ifndef _NET_ROUTE_H_
#define _NET_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, a reference
* to a routing entry, and a reference to an llentry.
* These are often held by protocols in their control
* blocks, e.g. inpcb.
*/
struct route {
struct rtentry *ro_rt;
struct llentry *ro_lle;
struct in_ifaddr *ro_ia;
int ro_flags;
struct sockaddr ro_dst;
};
#define RT_CACHING_CONTEXT 0x1 /* XXX: not used anywhere */
#define RT_NORTREF 0x2 /* doesn't hold reference on ro_rt */
/*
* These numbers are used by reliable protocols for determining
* retransmission behavior and are included in the routing structure.
*/
struct rt_metrics_lite {
u_long rmx_mtu; /* MTU for this path */
u_long rmx_expire; /* lifetime for route, e.g. redirect */
u_long rmx_pksent; /* packets sent using this route */
u_long rmx_weight; /* absolute weight */
};
struct rt_metrics {
u_long rmx_locks; /* Kernel must leave these values alone */
u_long rmx_mtu; /* MTU for this path */
u_long rmx_hopcount; /* max hops expected */
u_long rmx_expire; /* lifetime for route, e.g. redirect */
u_long rmx_recvpipe; /* inbound delay-bandwidth product */
u_long rmx_sendpipe; /* outbound delay-bandwidth product */
u_long rmx_ssthresh; /* outbound gateway buffer limit */
u_long rmx_rtt; /* estimated round trip time */
u_long rmx_rttvar; /* estimated rtt variance */
u_long rmx_pksent; /* packets sent using this route */
u_long rmx_weight; /* route weight */
u_long rmx_filler[3]; /* will be used for T/TCP later */
};
/*
* 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))
#define RT_DEFAULT_FIB 0 /* Explicitly mark fib=0 restricted cases */
extern u_int rt_numfibs; /* number fo usable routing tables */
/*
* XXX kernel function pointer `rt_output' is visible to applications.
*/
struct mbuf;
/*
* 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>
#ifdef RADIX_MPATH
#include <net/radix_mpath.h>
#endif
#endif
struct rtentry {
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 */
int rt_flags; /* up/down?, host/net */
int rt_refcnt; /* # held references */
struct ifnet *rt_ifp; /* the answer: interface to use */
struct ifaddr *rt_ifa; /* the answer: interface address to use */
struct rt_metrics_lite rt_rmx; /* metrics used by rx'ing protocols */
u_int rt_fibnum; /* which FIB */
#ifdef _KERNEL
/* XXX ugly, user apps use this definition but don't have a mtx def */
struct mtx rt_mtx; /* mutex for routing entry */
#endif
};
/*
* Following structure necessary for 4.3 compatibility;
* We should eventually move it to a compat file.
*/
struct ortentry {
u_long rt_hash; /* to speed lookups */
struct sockaddr rt_dst; /* key */
struct sockaddr rt_gateway; /* value */
short rt_flags; /* up/down?, host/net */
short rt_refcnt; /* # held references */
u_long rt_use; /* raw # packets forwarded */
struct ifnet *rt_ifp; /* the answer: interface to use */
};
#define rt_use rt_rmx.rmx_pksent
#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 */
/* 0x80 unused, was RTF_DELCLONE */
/* 0x100 unused, was RTF_CLONING */
#define RTF_XRESOLVE 0x200 /* external daemon resolves name */
#define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward
compatibility */
#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_PROTO2 0x4000 /* protocol specific routing flag */
#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
/* XXX: temporary to stay API/ABI compatible with userland */
#ifndef _KERNEL
#define RTF_PRCLONING 0x10000 /* unused, for compatibility */
#endif
/* 0x20000 unused, was RTF_WASCLONED */
#define RTF_PROTO3 0x40000 /* protocol specific routing flag */
/* 0x80000 unused */
#define RTF_PINNED 0x100000 /* future use */
#define RTF_LOCAL 0x200000 /* route represents a local address */
#define RTF_BROADCAST 0x400000 /* route represents a bcast address */
#define RTF_MULTICAST 0x800000 /* route represents a mcast address */
/* 0x8000000 and up unassigned */
#define RTF_STICKY 0x10000000 /* always route dst->src */
#define RTF_RNH_LOCKED 0x40000000 /* radix node head is locked */
/* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
#define RTF_FMASK \
(RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
RTF_REJECT | RTF_STATIC | RTF_STICKY)
/*
* Routing statistics.
*/
struct rtstat {
short rts_badredirect; /* bogus redirect calls */
short rts_dynamic; /* routes created by redirects */
short rts_newgateway; /* routes modified by redirects */
short rts_unreach; /* lookups which failed */
short rts_wildcard; /* lookups satisfied by a wildcard */
};
/*
* Structures for routing messages.
*/
struct rt_msghdr {
u_short rtm_msglen; /* 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_fmask; /* bitmask used in RTM_CHANGE message */
u_long rtm_inits; /* which metrics we are initializing */
struct rt_metrics rtm_rmx; /* metrics themselves */
};
#define RTM_VERSION 5 /* Up the ante and ignore older versions */
/*
* Message types.
*/
#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_NEWADDR 0xc /* address being added to iface */
#define RTM_DELADDR 0xd /* address being removed from iface */
#define RTM_IFINFO 0xe /* iface going up/down etc. */
#define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
#define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
#define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */
#define RTM_IEEE80211 0x12 /* IEEE80211 wireless event */
/*
* Bitmask values for rtm_inits and rmx_locks.
*/
#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 RTV_WEIGHT 0x100 /* init or lock _weight */
/*
* Bitmask values for rtm_addrs.
*/
#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 */
/*
* 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_MAX 8 /* size of array to allocate */
struct rt_addrinfo {
int rti_addrs;
struct sockaddr *rti_info[RTAX_MAX];
int rti_flags;
struct ifaddr *rti_ifa;
struct ifnet *rti_ifp;
};
/*
* This macro returns the size of a struct sockaddr when passed
* through a routing socket. Basically we round up sa_len to
* a multiple of sizeof(long), with a minimum of sizeof(long).
* The check for a NULL pointer is just a convenience, probably never used.
* The case sa_len == 0 should only apply to empty structures.
*/
#define SA_SIZE(sa) \
( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \
sizeof(long) : \
1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
#ifdef _KERNEL
#define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \
|| (ifp)->if_link_state == LINK_STATE_UP)
#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 %d", (_rt)->rt_refcnt)); \
(_rt)->rt_refcnt++; \
} while (0)
#define RT_REMREF(_rt) do { \
RT_LOCK_ASSERT(_rt); \
KASSERT((_rt)->rt_refcnt > 0, \
("bogus refcnt %d", (_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 = 0; \
} while (0)
#define RTFREE(_rt) do { \
RT_LOCK(_rt); \
RTFREE_LOCKED(_rt); \
} while (0)
#define RO_RTFREE(_ro) do { \
if ((_ro)->ro_rt) { \
if ((_ro)->ro_flags & RT_NORTREF) { \
(_ro)->ro_flags &= ~RT_NORTREF; \
(_ro)->ro_rt = NULL; \
} else { \
RT_LOCK((_ro)->ro_rt); \
RTFREE_LOCKED((_ro)->ro_rt); \
} \
} \
} while (0)
struct radix_node_head *rt_tables_get_rnh(int, int);
struct ifmultiaddr;
void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
void rt_ifannouncemsg(struct ifnet *, int);
void rt_ifmsg(struct ifnet *);
void rt_missmsg(int, struct rt_addrinfo *, int, int);
void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int);
void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
void rt_newaddrmsg_fib(int, struct ifaddr *, int, struct rtentry *, int);
void rt_newmaddrmsg(int, struct ifmultiaddr *);
int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
void rt_maskedcopy(struct sockaddr *, struct sockaddr *, struct sockaddr *);
/*
* Note the following locking behavior:
*
* rtalloc_ign() and rtalloc() return ro->ro_rt unlocked
*
* rtalloc1() returns a locked rtentry
*
* rtfree() and RTFREE_LOCKED() require a locked rtentry
*
* RTFREE() uses an unlocked entry.
*/
int rtexpunge(struct rtentry *);
void rtfree(struct rtentry *);
int rt_check(struct rtentry **, struct rtentry **, struct sockaddr *);
/* XXX MRT COMPAT VERSIONS THAT SET UNIVERSE to 0 */
/* Thes are used by old code not yet converted to use multiple FIBS */
int rt_getifa(struct rt_addrinfo *);
void rtalloc_ign(struct route *ro, u_long ignflags);
void rtalloc(struct route *ro); /* XXX deprecated, use rtalloc_ign(ro, 0) */
struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
int rtinit(struct ifaddr *, int, int);
int rtioctl(u_long, caddr_t);
void rtredirect(struct sockaddr *, struct sockaddr *,
struct sockaddr *, int, struct sockaddr *);
int rtrequest(int, struct sockaddr *,
struct sockaddr *, struct sockaddr *, int, struct rtentry **);
#ifndef BURN_BRIDGES
/* defaults to "all" FIBs */
int rtinit_fib(struct ifaddr *, int, int);
#endif
/* XXX MRT NEW VERSIONS THAT USE FIBs
* For now the protocol indepedent versions are the same as the AF_INET ones
* but this will change..
*/
int rt_getifa_fib(struct rt_addrinfo *, u_int fibnum);
void rtalloc_ign_fib(struct route *ro, u_long ignflags, u_int fibnum);
void rtalloc_fib(struct route *ro, u_int fibnum);
struct rtentry *rtalloc1_fib(struct sockaddr *, int, u_long, u_int);
int rtioctl_fib(u_long, caddr_t, u_int);
void rtredirect_fib(struct sockaddr *, struct sockaddr *,
struct sockaddr *, int, struct sockaddr *, u_int);
int rtrequest_fib(int, struct sockaddr *,
struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
int rtrequest1_fib(int, struct rt_addrinfo *, struct rtentry **, u_int);
#include <sys/eventhandler.h>
typedef void (*rtevent_arp_update_fn)(void *, struct rtentry *, uint8_t *, struct sockaddr *);
typedef void (*rtevent_redirect_fn)(void *, struct rtentry *, struct rtentry *, struct sockaddr *);
/* route_arp_update_event is no longer generated; see arp_update_event */
EVENTHANDLER_DECLARE(route_arp_update_event, rtevent_arp_update_fn);
EVENTHANDLER_DECLARE(route_redirect_event, rtevent_redirect_fn);
#endif
#endif
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