405 lines
10 KiB
C
Executable File
405 lines
10 KiB
C
Executable File
/* $KAME: addrconf.c,v 1.8 2005/09/16 11:30:13 suz Exp $ */
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/*
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* Copyright (C) 2002 WIDE Project.
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* All rights reserved.
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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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#ifdef __FreeBSD__
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#include <net/if_var.h>
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#endif
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#include <netinet/in.h>
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#ifdef __KAME__
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#include <netinet6/in6_var.h>
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#include <netinet6/nd6.h>
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#endif
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#include <errno.h>
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#include <syslog.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "dhcp6.h"
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#include "config.h"
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#include "common.h"
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#include "timer.h"
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#include "dhcp6c_ia.h"
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#include "prefixconf.h"
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TAILQ_HEAD(statefuladdr_list, statefuladdr);
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struct iactl_na {
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struct iactl common;
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struct statefuladdr_list statefuladdr_head;
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};
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#define iacna_ia common.iactl_ia
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#define iacna_callback common.callback
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#define iacna_isvalid common.isvalid
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#define iacna_duration common.duration
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#define iacna_renew_data common.renew_data
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#define iacna_rebind_data common.rebind_data
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#define iacna_reestablish_data common.reestablish_data
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#define iacna_release_data common.release_data
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#define iacna_cleanup common.cleanup
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struct statefuladdr {
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TAILQ_ENTRY (statefuladdr) link;
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struct dhcp6_statefuladdr addr;
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time_t updatetime;
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struct dhcp6_timer *timer;
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struct iactl_na *ctl;
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struct dhcp6_if *dhcpif;
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};
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static struct statefuladdr *find_addr __P((struct statefuladdr_list *,
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struct dhcp6_statefuladdr *));
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static int remove_addr __P((struct statefuladdr *));
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static int isvalid_addr __P((struct iactl *));
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static u_int32_t duration_addr __P((struct iactl *));
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static void cleanup_addr __P((struct iactl *));
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static int renew_addr __P((struct iactl *, struct dhcp6_ia *,
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struct dhcp6_eventdata **, struct dhcp6_eventdata *));
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static void na_renew_data_free __P((struct dhcp6_eventdata *));
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static struct dhcp6_timer *addr_timo __P((void *));
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static int na_ifaddrconf __P((ifaddrconf_cmd_t, struct statefuladdr *));
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extern struct dhcp6_timer *client6_timo __P((void *));
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int
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update_address(ia, addr, dhcpifp, ctlp, callback)
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struct ia *ia;
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struct dhcp6_statefuladdr *addr;
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struct dhcp6_if *dhcpifp;
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struct iactl **ctlp;
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void (*callback)__P((struct ia *));
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{
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struct iactl_na *iac_na = (struct iactl_na *)*ctlp;
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struct statefuladdr *sa;
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int sacreate = 0;
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struct timeval timo;
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/*
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* A client discards any addresses for which the preferred
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* lifetime is greater than the valid lifetime.
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* [RFC3315 22.6]
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*/
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if (addr->vltime != DHCP6_DURATION_INFINITE &&
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(addr->pltime == DHCP6_DURATION_INFINITE ||
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addr->pltime > addr->vltime)) {
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dprintf(LOG_INFO, FNAME, "invalid address %s: "
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"pltime (%lu) is larger than vltime (%lu)",
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in6addr2str(&addr->addr, 0),
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addr->pltime, addr->vltime);
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return (-1);
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}
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if (iac_na == NULL) {
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if ((iac_na = malloc(sizeof(*iac_na))) == NULL) {
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dprintf(LOG_NOTICE, FNAME, "memory allocation failed");
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return (-1);
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}
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memset(iac_na, 0, sizeof(*iac_na));
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iac_na->iacna_ia = ia;
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iac_na->iacna_callback = callback;
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iac_na->iacna_isvalid = isvalid_addr;
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iac_na->iacna_duration = duration_addr;
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iac_na->iacna_cleanup = cleanup_addr;
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iac_na->iacna_renew_data =
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iac_na->iacna_rebind_data =
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iac_na->iacna_release_data =
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iac_na->iacna_reestablish_data = renew_addr;
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TAILQ_INIT(&iac_na->statefuladdr_head);
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*ctlp = (struct iactl *)iac_na;
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}
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/* search for the given address, and make a new one if it fails */
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if ((sa = find_addr(&iac_na->statefuladdr_head, addr)) == NULL) {
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if ((sa = malloc(sizeof(*sa))) == NULL) {
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dprintf(LOG_NOTICE, FNAME, "memory allocation failed");
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return (-1);
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}
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memset(sa, 0, sizeof(*sa));
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sa->addr.addr = addr->addr;
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sa->ctl = iac_na;
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TAILQ_INSERT_TAIL(&iac_na->statefuladdr_head, sa, link);
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sacreate = 1;
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}
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/* update the timestamp of update */
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sa->updatetime = time(NULL);
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/* update the prefix according to addr */
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sa->addr.pltime = addr->pltime;
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sa->addr.vltime = addr->vltime;
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sa->dhcpif = dhcpifp;
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dprintf(LOG_DEBUG, FNAME, "%s an address %s pltime=%lu, vltime=%lu",
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sacreate ? "create" : "update",
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in6addr2str(&addr->addr, 0), addr->pltime, addr->vltime);
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if (sa->addr.vltime != 0)
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if (na_ifaddrconf(IFADDRCONF_ADD, sa) < 0)
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return (-1);
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/*
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* If the new vltime is 0, this address immediately expires.
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* Otherwise, set up or update the associated timer.
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*/
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switch (sa->addr.vltime) {
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case 0:
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if (remove_addr(sa) < 0)
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return (-1);
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break;
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case DHCP6_DURATION_INFINITE:
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if (sa->timer)
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dhcp6_remove_timer(&sa->timer);
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break;
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default:
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if (sa->timer == NULL) {
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sa->timer = dhcp6_add_timer(addr_timo, sa);
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if (sa->timer == NULL) {
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dprintf(LOG_NOTICE, FNAME,
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"failed to add stateful addr timer");
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remove_addr(sa); /* XXX */
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return (-1);
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}
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}
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/* update the timer */
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timo.tv_sec = sa->addr.vltime;
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timo.tv_usec = 0;
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dhcp6_set_timer(&timo, sa->timer);
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break;
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}
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return (0);
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}
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static struct statefuladdr *
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find_addr(head, addr)
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struct statefuladdr_list *head;
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struct dhcp6_statefuladdr *addr;
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{
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struct statefuladdr *sa;
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for (sa = TAILQ_FIRST(head); sa; sa = TAILQ_NEXT(sa, link)) {
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if (!IN6_ARE_ADDR_EQUAL(&sa->addr.addr, &addr->addr))
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continue;
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return (sa);
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}
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return (NULL);
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}
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static int
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remove_addr(sa)
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struct statefuladdr *sa;
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{
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int ret;
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dprintf(LOG_DEBUG, FNAME, "remove an address %s",
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in6addr2str(&sa->addr.addr, 0));
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if (sa->timer)
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dhcp6_remove_timer(&sa->timer);
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TAILQ_REMOVE(&sa->ctl->statefuladdr_head, sa, link);
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ret = na_ifaddrconf(IFADDRCONF_REMOVE, sa);
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free(sa);
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return (ret);
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}
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static int
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isvalid_addr(iac)
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struct iactl *iac;
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{
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struct iactl_na *iac_na = (struct iactl_na *)iac;
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if (TAILQ_EMPTY(&iac_na->statefuladdr_head))
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return (0); /* this IA is invalid */
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return (1);
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}
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static u_int32_t
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duration_addr(iac)
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struct iactl *iac;
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{
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struct iactl_na *iac_na = (struct iactl_na *)iac;
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struct statefuladdr *sa;
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u_int32_t base = DHCP6_DURATION_INFINITE, pltime, passed;
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time_t now;
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/* Determine the smallest period until pltime expires. */
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now = time(NULL);
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for (sa = TAILQ_FIRST(&iac_na->statefuladdr_head); sa;
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sa = TAILQ_NEXT(sa, link)) {
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passed = now > sa->updatetime ?
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(u_int32_t)(now - sa->updatetime) : 0;
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pltime = sa->addr.pltime > passed ?
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sa->addr.pltime - passed : 0;
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if (base == DHCP6_DURATION_INFINITE || pltime < base)
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base = pltime;
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}
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return (base);
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}
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static void
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cleanup_addr(iac)
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struct iactl *iac;
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{
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struct iactl_na *iac_na = (struct iactl_na *)iac;
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struct statefuladdr *sa;
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while ((sa = TAILQ_FIRST(&iac_na->statefuladdr_head)) != NULL) {
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TAILQ_REMOVE(&iac_na->statefuladdr_head, sa, link);
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remove_addr(sa);
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}
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free(iac);
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}
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static int
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renew_addr(iac, iaparam, evdp, evd)
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struct iactl *iac;
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struct dhcp6_ia *iaparam;
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struct dhcp6_eventdata **evdp, *evd;
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{
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struct iactl_na *iac_na = (struct iactl_na *)iac;
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struct statefuladdr *sa;
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struct dhcp6_list *ial = NULL, pl;
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TAILQ_INIT(&pl);
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for (sa = TAILQ_FIRST(&iac_na->statefuladdr_head); sa;
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sa = TAILQ_NEXT(sa, link)) {
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if (dhcp6_add_listval(&pl, DHCP6_LISTVAL_STATEFULADDR6,
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&sa->addr, NULL) == NULL)
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goto fail;
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}
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if ((ial = malloc(sizeof(*ial))) == NULL)
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goto fail;
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TAILQ_INIT(ial);
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if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IANA, iaparam, &pl) == NULL)
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goto fail;
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dhcp6_clear_list(&pl);
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evd->type = DHCP6_EVDATA_IANA;
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evd->data = (void *)ial;
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evd->privdata = (void *)evdp;
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evd->destructor = na_renew_data_free;
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return (0);
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fail:
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dhcp6_clear_list(&pl);
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if (ial)
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free(ial);
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return (-1);
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}
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static void
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na_renew_data_free(evd)
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struct dhcp6_eventdata *evd;
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{
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struct dhcp6_list *ial;
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if (evd->type != DHCP6_EVDATA_IANA) {
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dprintf(LOG_ERR, FNAME, "assumption failure");
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exit(1);
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}
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if (evd->privdata)
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*(struct dhcp6_eventdata **)evd->privdata = NULL;
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ial = (struct dhcp6_list *)evd->data;
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dhcp6_clear_list(ial);
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free(ial);
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}
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static struct dhcp6_timer *
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addr_timo(arg)
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void *arg;
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{
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struct statefuladdr *sa = (struct statefuladdr *)arg;
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struct ia *ia;
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void (*callback)__P((struct ia *));
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dprintf(LOG_DEBUG, FNAME, "address timeout for %s",
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in6addr2str(&sa->addr.addr, 0));
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ia = sa->ctl->iacna_ia;
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callback = sa->ctl->iacna_callback;
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if (sa->timer)
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dhcp6_remove_timer(&sa->timer);
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remove_addr(sa);
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(*callback)(ia);
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return (NULL);
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}
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static int
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na_ifaddrconf(cmd, sa)
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ifaddrconf_cmd_t cmd;
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struct statefuladdr *sa;
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{
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struct dhcp6_statefuladdr *addr;
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struct sockaddr_in6 sin6;
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addr = &sa->addr;
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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#ifdef HAVE_SA_LEN
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sin6.sin6_len = sizeof(sin6);
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#endif
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sin6.sin6_addr = addr->addr;
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#if 1 //TC
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return (ifaddrconf(cmd, sa->dhcpif->ifname, &sin6, 64,
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addr->pltime, addr->vltime));
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#else
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return (ifaddrconf(cmd, sa->dhcpif->ifname, &sin6, 128,
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addr->pltime, addr->vltime));
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#endif
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}
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