162 lines
4.3 KiB
C
162 lines
4.3 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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/*
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* This file contains code responsible for expiring temporal routes
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* (typically, redirect-originated) from the route tables.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/ck.h>
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#include <sys/rmlock.h>
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#include <sys/callout.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/route/route_ctl.h>
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#include <net/route/route_var.h>
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#include <net/vnet.h>
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/*
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* Callback returning 1 for the expired routes.
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* Updates time of the next nearest route expiration as a side effect.
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*/
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static int
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expire_route(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
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{
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time_t *next_callout;
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if (rt->rt_expire == 0)
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return (0);
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if (rt->rt_expire <= time_uptime)
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return (1);
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next_callout = (time_t *)arg;
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/*
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* Update next_callout to determine the next ts to
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* run the callback at.
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*/
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if (*next_callout == 0 || *next_callout > rt->rt_expire)
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*next_callout = rt->rt_expire;
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return (0);
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}
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/*
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* Per-rnh callout function traversing the tree and deleting
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* expired routes. Calculates next callout run by looking at
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* the rt_expire time for the remaining temporal routes.
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*/
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static void
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expire_callout(void *arg)
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{
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struct rib_head *rnh;
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time_t next_expire;
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int seconds;
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rnh = (struct rib_head *)arg;
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CURVNET_SET(rnh->rib_vnet);
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next_expire = 0;
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rib_walk_del(rnh->rib_fibnum, rnh->rib_family, expire_route,
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(void *)&next_expire, 1);
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RIB_WLOCK(rnh);
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if (next_expire > 0) {
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seconds = (next_expire - time_uptime);
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if (seconds < 0)
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seconds = 0;
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callout_reset_sbt(&rnh->expire_callout, SBT_1S * seconds,
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SBT_1MS * 500, expire_callout, rnh, 0);
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rnh->next_expire = next_expire;
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} else {
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/*
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* Before resetting next_expire, check that tmproutes_update()
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* has not kicked in and scheduled another invocation.
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*/
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if (callout_pending(&rnh->expire_callout) == 0)
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rnh->next_expire = 0;
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}
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RIB_WUNLOCK(rnh);
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CURVNET_RESTORE();
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}
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/*
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* Function responsible for updating the time of the next calllout
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* w.r.t. new temporal routes insertion.
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*
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* Called by the routing code upon adding new temporal route
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* to the tree. RIB_WLOCK must be held.
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*/
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void
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tmproutes_update(struct rib_head *rnh, struct rtentry *rt)
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{
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int seconds;
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RIB_WLOCK_ASSERT(rnh);
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if (rnh->next_expire == 0 || rnh->next_expire > rt->rt_expire) {
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/*
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* Callback is not scheduled, is executing,
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* or is scheduled for a later time than we need.
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*
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* Schedule the one for the current @rt expiration time.
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*/
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seconds = (rt->rt_expire - time_uptime);
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if (seconds < 0)
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seconds = 0;
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callout_reset_sbt(&rnh->expire_callout, SBT_1S * seconds,
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SBT_1MS * 500, expire_callout, rnh, 0);
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rnh->next_expire = rt->rt_expire;
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}
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}
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void
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tmproutes_init(struct rib_head *rh)
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{
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callout_init(&rh->expire_callout, 1);
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}
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void
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tmproutes_destroy(struct rib_head *rh)
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{
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callout_drain(&rh->expire_callout);
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}
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