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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2020 Alexander V. Chernikov
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/sysproto.h>
#include <sys/proc.h>
#include <sys/domain.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route/route_var.h>
#include <net/route/nhop_utils.h>
#include <net/route/nhop.h>
#include <net/route/nhop_var.h>
#include <net/route/shared.h>
#ifdef INET
#include <netinet/in_fib.h>
#endif
#ifdef INET6
#include <netinet6/in6_fib.h>
#endif
#include <net/vnet.h>
/*
* RIB helper functions.
*/
/*
* Calls @wa_f with @arg for each entry in the table specified by
* @af and @fibnum.
*
* Table is traversed under read lock.
*/
void
rib_walk(int af, u_int fibnum, rt_walktree_f_t *wa_f, void *arg)
{
RIB_RLOCK_TRACKER;
struct rib_head *rnh;
if ((rnh = rt_tables_get_rnh(fibnum, af)) == NULL)
return;
RIB_RLOCK(rnh);
rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f, arg);
RIB_RUNLOCK(rnh);
}
/*
* Wrapper for the control plane functions for performing af-agnostic
* lookups.
* @fibnum: fib to perform the lookup.
* @dst: sockaddr with family and addr filled in. IPv6 addresses needs to be in
* deembedded from.
* @flags: fib(9) flags.
* @flowid: flow id for path selection in multipath use case.
*
* Returns nhop_object or NULL.
*
* Requires NET_EPOCH.
*
*/
struct nhop_object *
rib_lookup(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
uint32_t flowid)
{
struct nhop_object *nh;
nh = NULL;
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
{
const struct sockaddr_in *a = (const struct sockaddr_in *)dst;
nh = fib4_lookup(fibnum, a->sin_addr, 0, flags, flowid);
break;
}
#endif
#ifdef INET6
case AF_INET6:
{
const struct sockaddr_in6 *a = (const struct sockaddr_in6*)dst;
nh = fib6_lookup(fibnum, &a->sin6_addr, a->sin6_scope_id,
flags, flowid);
break;
}
#endif
}
return (nh);
}
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