682b902daf
Create rib_lookup() wrapper around per-af dataplane lookup functions. This will help in the cases of having control plane af-agnostic code. Switch ifa_ifwithroute() to use this function instead of rtalloc1(). Reviewed by: ae Differential Revision: https://reviews.freebsd.org/D24731
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Alexander V. Chernikov
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_route.h"
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/domain.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <net/route/route_var.h>
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#include <net/route/nhop_utils.h>
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#include <net/route/nhop.h>
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#include <net/route/nhop_var.h>
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#include <net/route/shared.h>
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#ifdef INET
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#include <netinet/in_fib.h>
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#endif
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#ifdef INET6
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#include <netinet6/in6_fib.h>
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#endif
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#include <net/vnet.h>
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/*
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* RIB helper functions.
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*/
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/*
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* Calls @wa_f with @arg for each entry in the table specified by
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* @af and @fibnum.
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*
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* Table is traversed under read lock.
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*/
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void
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rib_walk(int af, u_int fibnum, rt_walktree_f_t *wa_f, void *arg)
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{
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RIB_RLOCK_TRACKER;
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struct rib_head *rnh;
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if ((rnh = rt_tables_get_rnh(fibnum, af)) == NULL)
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return;
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RIB_RLOCK(rnh);
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rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f, arg);
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RIB_RUNLOCK(rnh);
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}
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/*
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* Wrapper for the control plane functions for performing af-agnostic
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* lookups.
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* @fibnum: fib to perform the lookup.
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* @dst: sockaddr with family and addr filled in. IPv6 addresses needs to be in
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* deembedded from.
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* @flags: fib(9) flags.
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* @flowid: flow id for path selection in multipath use case.
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*
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* Returns nhop_object or NULL.
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*
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* Requires NET_EPOCH.
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*
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*/
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struct nhop_object *
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rib_lookup(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
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uint32_t flowid)
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{
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struct nhop_object *nh;
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nh = NULL;
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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{
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const struct sockaddr_in *a = (const struct sockaddr_in *)dst;
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nh = fib4_lookup(fibnum, a->sin_addr, 0, flags, flowid);
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break;
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}
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#endif
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#ifdef INET6
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case AF_INET6:
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{
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const struct sockaddr_in6 *a = (const struct sockaddr_in6*)dst;
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nh = fib6_lookup(fibnum, &a->sin6_addr, a->sin6_scope_id,
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flags, flowid);
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break;
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}
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#endif
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}
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return (nh);
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}
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