156 lines
4.6 KiB
C
156 lines
4.6 KiB
C
/*
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* Copyright (c) 2020 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#include <kern/zalloc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/in6_ifattach.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/scope6_var.h>
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#include <sys/mcache.h>
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#define NDRTI_ZONE_NAME "nd6_route_info" /* zone name */
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static struct nd_route_info *nd6_rti_lookup(struct nd_route_info *);
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static KALLOC_TYPE_DEFINE(ndrti_zone, struct nd_route_info, NET_KT_DEFAULT);
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static boolean_t nd6_rti_list_busy = FALSE; /* protected by nd6_mutex */
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void
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nd6_rti_list_wait(const char *func)
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{
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LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED);
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while (nd6_rti_list_busy) {
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nd6log2(debug, "%s: someone else is operating "
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"on rti list. Entering sleep.\n", func);
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(void) msleep(&nd6_rti_list_busy, nd6_mutex, (PZERO - 1),
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func, NULL);
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LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED);
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}
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nd6_rti_list_busy = TRUE;
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}
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void
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nd6_rti_list_signal_done(void)
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{
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LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED);
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nd6_rti_list_busy = FALSE;
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wakeup(&nd6_rti_list_busy);
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}
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struct nd_route_info *
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ndrti_alloc(void)
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{
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return zalloc_flags(ndrti_zone, Z_WAITOK | Z_ZERO);
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}
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void
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ndrti_free(struct nd_route_info *rti)
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{
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if (!TAILQ_EMPTY(&rti->nd_rti_router_list)) {
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panic("%s: rti freed with non-empty router list", __func__);
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}
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zfree(ndrti_zone, rti);
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}
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static struct nd_route_info *
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nd6_rti_lookup(struct nd_route_info *rti)
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{
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struct nd_route_info *tmp_rti = NULL;
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LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED);
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TAILQ_FOREACH(tmp_rti, &nd_rti_list, nd_rti_entry) {
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if (IN6_ARE_ADDR_EQUAL(&tmp_rti->nd_rti_prefix, &rti->nd_rti_prefix) &&
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tmp_rti->nd_rti_prefixlen == rti->nd_rti_prefixlen) {
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break;
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}
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}
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return tmp_rti;
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}
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void
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nd6_rtilist_update(struct nd_route_info *new_rti, struct nd_defrouter *dr)
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{
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struct nd_route_info *rti = NULL;
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lck_mtx_lock(nd6_mutex);
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VERIFY(new_rti != NULL && dr != NULL);
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nd6_rti_list_wait(__func__);
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if ((rti = nd6_rti_lookup(new_rti)) != NULL) {
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(void)defrtrlist_update(dr, &rti->nd_rti_router_list);
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/*
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* The above may have removed an entry from default router list.
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* If it did and the list is now empty, remove the rti as well.
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*/
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if (TAILQ_EMPTY(&rti->nd_rti_router_list)) {
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TAILQ_REMOVE(&nd_rti_list, rti, nd_rti_entry);
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ndrti_free(rti);
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}
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} else if (dr->rtlifetime != 0) {
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rti = ndrti_alloc();
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TAILQ_INIT(&rti->nd_rti_router_list);
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rti->nd_rti_prefix = new_rti->nd_rti_prefix;
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rti->nd_rti_prefixlen = new_rti->nd_rti_prefixlen;
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(void)defrtrlist_update(dr, &rti->nd_rti_router_list);
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TAILQ_INSERT_HEAD(&nd_rti_list, rti, nd_rti_entry);
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}
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/* If rti doesn't exist and lifetime is 0, simply ignore */
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nd6_rti_list_signal_done();
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lck_mtx_unlock(nd6_mutex);
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}
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void
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nd6_rti_purge(struct nd_route_info *new_rti)
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{
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VERIFY(new_rti != NULL);
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LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_OWNED);
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struct nd_route_info *rti = NULL;
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nd6_rti_list_wait(__func__);
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if ((rti = nd6_rti_lookup(new_rti)) != NULL) {
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struct nd_defrouter *dr = NULL;
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struct nd_defrouter *ndr = NULL;
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TAILQ_FOREACH_SAFE(dr, &rti->nd_rti_router_list, dr_entry, ndr) {
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TAILQ_REMOVE(&rti->nd_rti_router_list, dr, dr_entry);
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defrtrlist_del(dr, &rti->nd_rti_router_list);
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NDDR_REMREF(dr);
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}
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TAILQ_REMOVE(&nd_rti_list, rti, nd_rti_entry);
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ndrti_free(rti);
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}
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nd6_rti_list_signal_done();
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}
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