Changeset View
Changeset View
Standalone View
Standalone View
head/sys/net/route_temporal.c
| Property | Old Value | New Value |
|---|---|---|
| svn:eol-style | null | native \ No newline at end of property |
| svn:keywords | null | FreeBSD=%H \ No newline at end of property |
| svn:mime-type | null | text/plain \ No newline at end of property |
| /*- | |||||
| * 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. | |||||
| */ | |||||
| /* | |||||
| * This file contains code responsible for expiring temporal routes | |||||
| * (typically, redirect-originated) from the route tables. | |||||
| */ | |||||
| #include <sys/cdefs.h> | |||||
| __FBSDID("$FreeBSD$"); | |||||
| #include <sys/param.h> | |||||
| #include <sys/systm.h> | |||||
| #include <sys/socket.h> | |||||
| #include <sys/kernel.h> | |||||
| #include <sys/lock.h> | |||||
| #include <sys/rmlock.h> | |||||
| #include <sys/callout.h> | |||||
| #include <net/if.h> | |||||
| #include <net/route.h> | |||||
| #include <net/route_var.h> | |||||
| #include <net/vnet.h> | |||||
| /* | |||||
| * Callback returning 1 for the expired routes. | |||||
| * Updates time of the next nearest route expiration as a side effect. | |||||
| */ | |||||
| static int | |||||
| expire_route(const struct rtentry *rt, void *arg) | |||||
| { | |||||
| time_t *next_callout; | |||||
| if (rt->rt_expire == 0) | |||||
| return (0); | |||||
| if (rt->rt_expire <= time_uptime) | |||||
| return (1); | |||||
| next_callout = (time_t *)arg; | |||||
| /* | |||||
| * Update next_callout to determine the next ts to | |||||
| * run the callback at. | |||||
| */ | |||||
| if (*next_callout == 0 || *next_callout > rt->rt_expire) | |||||
| *next_callout = rt->rt_expire; | |||||
| return (0); | |||||
| } | |||||
| /* | |||||
| * Per-rnh callout function traversing the tree and deleting | |||||
| * expired routes. Calculates next callout run by looking at | |||||
| * the rt_expire time for the remaining temporal routes. | |||||
| */ | |||||
| static void | |||||
| expire_callout(void *arg) | |||||
| { | |||||
| struct rib_head *rnh; | |||||
| time_t next_expire; | |||||
| int seconds; | |||||
| rnh = (struct rib_head *)arg; | |||||
| CURVNET_SET(rnh->rib_vnet); | |||||
| next_expire = 0; | |||||
| rib_walk_del(rnh->rib_fibnum, rnh->rib_family, expire_route, | |||||
| (void *)&next_expire, 1); | |||||
| RIB_WLOCK(rnh); | |||||
| if (next_expire > 0) { | |||||
| seconds = (next_expire - time_uptime); | |||||
| if (seconds < 0) | |||||
| seconds = 0; | |||||
| callout_reset_sbt(&rnh->expire_callout, SBT_1S * seconds, | |||||
| SBT_1MS * 500, expire_callout, rnh, 0); | |||||
| rnh->next_expire = next_expire; | |||||
| } else { | |||||
| /* | |||||
| * Before resetting next_expire, check that tmproutes_update() | |||||
| * has not kicked in and scheduled another invocation. | |||||
| */ | |||||
| if (callout_pending(&rnh->expire_callout) == 0) | |||||
| rnh->next_expire = 0; | |||||
| } | |||||
| RIB_WUNLOCK(rnh); | |||||
| CURVNET_RESTORE(); | |||||
| } | |||||
| /* | |||||
| * Function responsible for updating the time of the next calllout | |||||
| * w.r.t. new temporal routes insertion. | |||||
| * | |||||
| * Called by the routing code upon adding new temporal route | |||||
| * to the tree. RIB_WLOCK must be held. | |||||
| */ | |||||
| void | |||||
| tmproutes_update(struct rib_head *rnh, struct rtentry *rt) | |||||
| { | |||||
| int seconds; | |||||
| RIB_WLOCK_ASSERT(rnh); | |||||
| if (rnh->next_expire == 0 || rnh->next_expire > rt->rt_expire) { | |||||
| /* | |||||
| * Callback is not scheduled, is executing, | |||||
| * or is scheduled for a later time than we need. | |||||
| * | |||||
| * Schedule the one for the current @rt expiration time. | |||||
| */ | |||||
| seconds = (rt->rt_expire - time_uptime); | |||||
| if (seconds < 0) | |||||
| seconds = 0; | |||||
| callout_reset_sbt(&rnh->expire_callout, SBT_1S * seconds, | |||||
| SBT_1MS * 500, expire_callout, rnh, 0); | |||||
| rnh->next_expire = rt->rt_expire; | |||||
| } | |||||
| } | |||||
| void | |||||
| tmproutes_init(struct rib_head *rh) | |||||
| { | |||||
| callout_init(&rh->expire_callout, 1); | |||||
| } | |||||
| void | |||||
| tmproutes_destroy(struct rib_head *rh) | |||||
| { | |||||
| callout_drain(&rh->expire_callout); | |||||
| } | |||||