6ca363eb7b
lookup KPI in ip_output() like it is already used in ip_forward(). However, when there is no PCB provided we can use fast KPI, gaining performance advantage. Typical case when ip_output() is called without a PCB pointer is a sendto(2) on a not connected UDP socket. In practice DNS servers do this. Reviewed by: melifaro Differential Revision: https://reviews.freebsd.org/D19804
507 lines
19 KiB
C
507 lines
19 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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* 3. 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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#include <sys/counter.h>
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#include <net/vnet.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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* Struct route consiste of a destination address,
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* a route entry pointer, link-layer prepend data pointer along
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* with its length.
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*/
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struct route {
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struct rtentry *ro_rt;
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struct llentry *ro_lle;
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/*
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* ro_prepend and ro_plen are only used for bpf to pass in a
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* preformed header. They are not cacheable.
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*/
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char *ro_prepend;
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uint16_t ro_plen;
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uint16_t ro_flags;
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uint16_t ro_mtu; /* saved ro_rt mtu */
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uint16_t spare;
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struct sockaddr ro_dst;
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};
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#define RT_L2_ME_BIT 2 /* dst L2 addr is our address */
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#define RT_MAY_LOOP_BIT 3 /* dst may require loop copy */
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#define RT_HAS_HEADER_BIT 4 /* mbuf already have its header prepended */
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#define RT_L2_ME (1 << RT_L2_ME_BIT) /* 0x0004 */
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#define RT_MAY_LOOP (1 << RT_MAY_LOOP_BIT) /* 0x0008 */
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#define RT_HAS_HEADER (1 << RT_HAS_HEADER_BIT) /* 0x0010 */
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#define RT_REJECT 0x0020 /* Destination is reject */
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#define RT_BLACKHOLE 0x0040 /* Destination is blackhole */
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#define RT_HAS_GW 0x0080 /* Destination has GW */
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#define RT_LLE_CACHE 0x0100 /* Cache link layer */
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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_weight; /* route weight */
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u_long rmx_filler[3]; /* 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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/* lle state is exported in rmx_state rt_metrics field */
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#define rmx_state rmx_weight
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/*
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* Keep a generation count of routing table, incremented on route addition,
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* so we can invalidate caches. This is accessed without a lock, as precision
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* is not required.
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*/
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typedef volatile u_int rt_gen_t; /* tree generation (for adds) */
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#define RT_GEN(fibnum, af) rt_tables_get_gen(fibnum, af)
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#define RT_DEFAULT_FIB 0 /* Explicitly mark fib=0 restricted cases */
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#define RT_ALL_FIBS -1 /* Announce event for every fib */
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#ifdef _KERNEL
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extern u_int rt_numfibs; /* number of usable routing tables */
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VNET_DECLARE(u_int, rt_add_addr_allfibs); /* Announce interfaces to all fibs */
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#define V_rt_add_addr_allfibs VNET(rt_add_addr_allfibs)
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#endif
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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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#ifdef RADIX_MPATH
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#include <net/radix_mpath.h>
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#endif
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#endif
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#if defined(_KERNEL)
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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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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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int rt_flags; /* up/down?, host/net */
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int rt_refcnt; /* # held references */
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u_int rt_fibnum; /* which FIB */
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u_long rt_mtu; /* MTU for this path */
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u_long rt_weight; /* absolute weight */
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u_long rt_expire; /* lifetime for route, e.g. redirect */
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#define rt_endzero rt_pksent
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counter_u64_t rt_pksent; /* packets sent using this route */
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struct mtx rt_mtx; /* mutex for routing entry */
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struct rtentry *rt_chain; /* pointer to next rtentry to delete */
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};
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#endif /* _KERNEL */
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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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/* 0x100 unused, was RTF_CLONING */
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#define RTF_XRESOLVE 0x200 /* external daemon resolves name */
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#define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward
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compatibility */
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#define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
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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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/* 0x10000 unused, was RTF_PRCLONING */
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/* 0x20000 unused, was RTF_WASCLONED */
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#define RTF_PROTO3 0x40000 /* protocol specific routing flag */
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#define RTF_FIXEDMTU 0x80000 /* MTU was explicitly specified */
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#define RTF_PINNED 0x100000 /* route is immutable */
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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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/* 0x8000000 and up unassigned */
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#define RTF_STICKY 0x10000000 /* always route dst->src */
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#define RTF_RNH_LOCKED 0x40000000 /* radix node head is locked */
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#define RTF_GWFLAG_COMPAT 0x80000000 /* a compatibility bit for interacting
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with existing routing apps */
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/* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
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#define RTF_FMASK \
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(RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
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RTF_REJECT | RTF_STATIC | RTF_STICKY)
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/*
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* fib_ nexthop API flags.
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*/
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/* Consumer-visible nexthop info flags */
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#define NHF_REJECT 0x0010 /* RTF_REJECT */
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#define NHF_BLACKHOLE 0x0020 /* RTF_BLACKHOLE */
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#define NHF_REDIRECT 0x0040 /* RTF_DYNAMIC|RTF_MODIFIED */
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#define NHF_DEFAULT 0x0080 /* Default route */
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#define NHF_BROADCAST 0x0100 /* RTF_BROADCAST */
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#define NHF_GATEWAY 0x0200 /* RTF_GATEWAY */
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#define NHF_HOST 0x0400 /* RTF_HOST */
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/* Nexthop request flags */
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#define NHR_IFAIF 0x01 /* Return ifa_ifp interface */
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#define NHR_REF 0x02 /* For future use */
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/* Control plane route request flags */
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#define NHR_COPY 0x100 /* Copy rte data */
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#ifdef _KERNEL
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/* rte<>ro_flags translation */
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static inline void
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rt_update_ro_flags(struct route *ro)
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{
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int rt_flags = ro->ro_rt->rt_flags;
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ro->ro_flags &= ~ (RT_REJECT|RT_BLACKHOLE|RT_HAS_GW);
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ro->ro_flags |= (rt_flags & RTF_REJECT) ? RT_REJECT : 0;
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ro->ro_flags |= (rt_flags & RTF_BLACKHOLE) ? RT_BLACKHOLE : 0;
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ro->ro_flags |= (rt_flags & RTF_GATEWAY) ? RT_HAS_GW : 0;
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}
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#endif
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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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u_short _rtm_spare1;
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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_fmask; /* bitmask used in RTM_CHANGE message */
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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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* The format for each message is annotated below using the following
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* identifiers:
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*
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* (1) struct rt_msghdr
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* (2) struct ifa_msghdr
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* (3) struct if_msghdr
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* (4) struct ifma_msghdr
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* (5) struct if_announcemsghdr
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*
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*/
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#define RTM_ADD 0x1 /* (1) Add Route */
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#define RTM_DELETE 0x2 /* (1) Delete Route */
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#define RTM_CHANGE 0x3 /* (1) Change Metrics or flags */
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#define RTM_GET 0x4 /* (1) Report Metrics */
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#define RTM_LOSING 0x5 /* (1) Kernel Suspects Partitioning */
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#define RTM_REDIRECT 0x6 /* (1) Told to use different route */
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#define RTM_MISS 0x7 /* (1) Lookup failed on this address */
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#define RTM_LOCK 0x8 /* (1) fix specified metrics */
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/* 0x9 */
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/* 0xa */
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#define RTM_RESOLVE 0xb /* (1) req to resolve dst to LL addr */
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#define RTM_NEWADDR 0xc /* (2) address being added to iface */
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#define RTM_DELADDR 0xd /* (2) address being removed from iface */
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#define RTM_IFINFO 0xe /* (3) iface going up/down etc. */
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#define RTM_NEWMADDR 0xf /* (4) mcast group membership being added to if */
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#define RTM_DELMADDR 0x10 /* (4) mcast group membership being deleted */
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#define RTM_IFANNOUNCE 0x11 /* (5) iface arrival/departure */
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#define RTM_IEEE80211 0x12 /* (5) IEEE80211 wireless event */
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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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#define RTV_WEIGHT 0x100 /* init or lock _weight */
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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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typedef int rt_filter_f_t(const struct rtentry *, void *);
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struct rt_addrinfo {
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int rti_addrs; /* Route RTF_ flags */
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int rti_flags; /* Route RTF_ flags */
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struct sockaddr *rti_info[RTAX_MAX]; /* Sockaddr data */
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struct ifaddr *rti_ifa; /* value of rt_ifa addr */
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struct ifnet *rti_ifp; /* route interface */
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rt_filter_f_t *rti_filter; /* filter function */
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void *rti_filterdata; /* filter paramenters */
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u_long rti_mflags; /* metrics RTV_ flags */
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u_long rti_spare; /* Will be used for fib */
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struct rt_metrics *rti_rmx; /* Pointer to route metrics */
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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 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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( (((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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#define sa_equal(a, b) ( \
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(((const struct sockaddr *)(a))->sa_len == ((const struct sockaddr *)(b))->sa_len) && \
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(bcmp((a), (b), ((const struct sockaddr *)(b))->sa_len) == 0))
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#ifdef _KERNEL
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#define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \
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|| (ifp)->if_link_state == LINK_STATE_UP)
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#define RT_LOCK_INIT(_rt) \
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mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK | MTX_NEW)
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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_UNLOCK_COND(_rt) do { \
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if (mtx_owned(&(_rt)->rt_mtx)) \
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mtx_unlock(&(_rt)->rt_mtx); \
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} while (0)
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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 %d", (_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 %d", (_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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#define RO_RTFREE(_ro) do { \
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if ((_ro)->ro_rt) \
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RTFREE((_ro)->ro_rt); \
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} while (0)
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#define RO_INVALIDATE_CACHE(ro) do { \
|
|
RO_RTFREE(ro); \
|
|
if ((ro)->ro_lle != NULL) { \
|
|
LLE_FREE((ro)->ro_lle); \
|
|
(ro)->ro_lle = NULL; \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* Validate a cached route based on a supplied cookie. If there is an
|
|
* out-of-date cache, simply free it. Update the generation number
|
|
* for the new allocation
|
|
*/
|
|
#define RT_VALIDATE(ro, cookiep, fibnum) do { \
|
|
rt_gen_t cookie = RT_GEN(fibnum, (ro)->ro_dst.sa_family); \
|
|
if (*(cookiep) != cookie) { \
|
|
RO_INVALIDATE_CACHE(ro); \
|
|
*(cookiep) = cookie; \
|
|
} \
|
|
} while (0)
|
|
|
|
struct ifmultiaddr;
|
|
struct rib_head;
|
|
|
|
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);
|
|
int rt_addrmsg(int, struct ifaddr *, int);
|
|
int rt_routemsg(int, struct ifnet *ifp, 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 *);
|
|
struct rib_head *rt_table_init(int);
|
|
void rt_table_destroy(struct rib_head *);
|
|
u_int rt_tables_get_gen(int table, int fam);
|
|
|
|
int rtsock_addrmsg(int, struct ifaddr *, int);
|
|
int rtsock_routemsg(int, struct ifnet *ifp, int, struct rtentry *, int);
|
|
|
|
/*
|
|
* Note the following locking behavior:
|
|
*
|
|
* rtalloc1() returns a locked rtentry
|
|
*
|
|
* rtfree() and RTFREE_LOCKED() require a locked rtentry
|
|
*
|
|
* RTFREE() uses an unlocked entry.
|
|
*/
|
|
|
|
void rtfree(struct rtentry *);
|
|
void rt_updatemtu(struct ifnet *);
|
|
|
|
typedef int rt_walktree_f_t(struct rtentry *, void *);
|
|
typedef void rt_setwarg_t(struct rib_head *, uint32_t, int, void *);
|
|
void rt_foreach_fib_walk(int af, rt_setwarg_t *, rt_walktree_f_t *, void *);
|
|
void rt_foreach_fib_walk_del(int af, rt_filter_f_t *filter_f, void *arg);
|
|
void rt_flushifroutes_af(struct ifnet *, int);
|
|
void rt_flushifroutes(struct ifnet *ifp);
|
|
|
|
/* XXX MRT COMPAT VERSIONS THAT SET UNIVERSE to 0 */
|
|
/* Thes are used by old code not yet converted to use multiple FIBS */
|
|
struct rtentry *rtalloc1(struct sockaddr *, int, u_long);
|
|
int rtinit(struct ifaddr *, int, int);
|
|
|
|
/* 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);
|
|
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);
|
|
int rib_lookup_info(uint32_t, const struct sockaddr *, uint32_t, uint32_t,
|
|
struct rt_addrinfo *);
|
|
void rib_free_info(struct rt_addrinfo *info);
|
|
|
|
#endif
|
|
|
|
#endif
|