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dhcp6c_ia.c
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dhcp6c_ia.c
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/* $KAME: dhcp6c_ia.c,v 1.33 2005/07/22 08:50:05 jinmei Exp $ */
/*
* Copyright (C) 2003 WIDE Project.
* All rights reserved.
*
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dhcp6.h"
#include "config.h"
#include "common.h"
#include "timer.h"
#include "dhcp6c.h"
#include "dhcp6c_ia.h"
#include "prefixconf.h"
#include "addrconf.h"
typedef enum {IAS_ACTIVE, IAS_RENEW, IAS_REBIND} iastate_t;
struct ia {
TAILQ_ENTRY(ia) link;
/* back pointer to configuration */
struct ia_conf *conf;
/* common parameters of IA */
uint32_t t1; /* duration for renewal */
uint32_t t2; /* duration for rebind */
/* internal parameters for renewal/rebinding */
iastate_t state;
struct dhcp6_timer *timer;
struct dhcp6_eventdata *evdata;
/* DHCP related parameters */
struct dhcp6_if *ifp; /* DHCP interface */
struct duid serverid; /* the server ID that provided this IA */
/* control information shared with each particular config routine */
struct iactl *ctl;
/* authentication parameters for transaction with servers on this IA */
struct authparam *authparam;
};
static int update_authparam(struct ia *, struct authparam *);
static void reestablish_ia(struct ia *);
static void callback(struct ia *);
static int release_ia(struct ia *);
static void remove_ia(struct ia *);
static struct ia *get_ia(iatype_t, struct dhcp6_if *, struct ia_conf *,
struct dhcp6_listval *, struct duid *);
static struct ia *find_ia(struct ia_conf *, iatype_t, uint32_t);
static struct dhcp6_timer *ia_timo(void *);
static const char *iastr(iatype_t);
static const char *statestr(iastate_t);
void
update_ia(iatype, ialist, ifp, serverid, authparam)
iatype_t iatype;
struct dhcp6_list *ialist;
struct dhcp6_if *ifp;
struct duid *serverid;
struct authparam *authparam;
{
struct ia *ia;
struct ia_conf *iac;
struct iapd_conf *iapdc;
struct iana_conf *ianac;
struct dhcp6_listval *iav, *siav;
struct timeval timo;
for (iav = TAILQ_FIRST(ialist); iav; iav = TAILQ_NEXT(iav, link)) {
/* if we're not interested in this IA, ignore it. */
if ((iac = find_iaconf(&ifp->iaconf_list, iatype,
iav->val_ia.iaid)) == NULL) {
continue;
}
/* validate parameters */
/*
* If a client receives an IA_NA with T1 greater than T2, and
* both T1 and T2 are greater than 0, the client discards the
* IA_NA option and processes the remainder of the message as
* though the server had not included the invalid IA_NA option.
* [RFC3315 22.4]
* We apply the same rule to IA_PD as well.
*/
if (iav->val_ia.t2 != 0 && iav->val_ia.t1 > iav->val_ia.t2) {
d_printf(LOG_INFO, FNAME,
"invalid IA: T1(%lu) > T2(%lu)",
iav->val_ia.t1, iav->val_ia.t2);
continue;
}
/* locate the local IA or make a new one */
ia = get_ia(iatype, ifp, iac, iav, serverid);
if (ia == NULL) {
d_printf(LOG_WARNING, FNAME, "failed to get an IA "
"type: %s, ID: %u", iastr(iac->type), iac->iaid);
continue;
}
/* update authentication parameters */
if (update_authparam(ia, authparam)) {
d_printf(LOG_WARNING, FNAME, "failed to update "
"authentication param for IA "
"type: %s, ID: %u", iastr(iac->type), iac->iaid);
remove_ia(ia);
continue;
}
/* update IA configuration information */
for (siav = TAILQ_FIRST(&iav->sublist); siav;
siav = TAILQ_NEXT(siav, link)) {
switch (siav->type) {
case DHCP6_LISTVAL_PREFIX6:
/* add or update the prefix */
iapdc = (struct iapd_conf *)iac;
if (update_prefix(ia, &siav->val_prefix6,
&iapdc->iapd_pif_list, ifp, &ia->ctl,
callback)) {
d_printf(LOG_NOTICE, FNAME,
"failed to update a prefix %s/%d",
in6addr2str(&siav->val_prefix6.addr, 0),
siav->val_prefix6.plen);
}
break;
case DHCP6_LISTVAL_STATEFULADDR6:
ianac = (struct iana_conf *)iac;
if (update_address(ia, &siav->val_statefuladdr6,
ifp, &ia->ctl, callback)) {
d_printf(LOG_NOTICE, FNAME,
"failed to update an address %s",
in6addr2str(&siav->val_statefuladdr6.addr, 0));
}
break;
case DHCP6_LISTVAL_STCODE:
d_printf(LOG_INFO, FNAME,
"status code for %s-%lu: %s",
iastr(iatype), iav->val_ia.iaid,
dhcp6_stcodestr(siav->val_num16));
if ((ia->state == IAS_RENEW ||
ia->state == IAS_REBIND) &&
siav->val_num16 == DH6OPT_STCODE_NOBINDING) {
/*
* For each IA in the original Renew or
* Rebind message, the client
* sends a Request message if the IA
* contained a Status Code option
* with the NoBinding status.
* [RFC3315 18.1.8]
* XXX: what about the PD case?
*/
d_printf(LOG_INFO, FNAME,
"receive NoBinding against "
"renew/rebind for %s-%lu",
iastr(ia->conf->type),
ia->conf->iaid);
reestablish_ia(ia);
goto nextia;
}
break;
default:
d_printf(LOG_ERR, FNAME, "impossible case");
goto nextia;
}
}
/* see if this IA is still valid. if not, remove it. */
if (ia->ctl == NULL || !(*ia->ctl->isvalid)(ia->ctl)) {
d_printf(LOG_DEBUG, FNAME, "IA %s-%lu is invalidated",
iastr(ia->conf->type), ia->conf->iaid);
remove_ia(ia);
continue;
}
/* if T1 or T2 is 0, determine appropriate values locally. */
if (ia->t1 == 0 || ia->t2 == 0) {
uint32_t duration;
if (ia->ctl && ia->ctl->duration)
duration = (*ia->ctl->duration)(ia->ctl);
else
duration = 1800; /* 30min. XXX: no rationale */
if (ia->t1 == 0) {
if (duration == DHCP6_DURATION_INFINITE)
ia->t1 = DHCP6_DURATION_INFINITE;
else
ia->t1 = duration / 2;
}
if (ia->t2 == 0) {
if (duration == DHCP6_DURATION_INFINITE)
ia->t2 = DHCP6_DURATION_INFINITE;
else
ia->t2 = duration * 4 / 5;
}
/* make sure T1 <= T2 */
if (ia->t1 > ia->t2)
ia->t1 = ia->t2 * 5 / 8;
d_printf(LOG_INFO, FNAME, "T1(%lu) and/or T2(%lu) "
"is locally determined", ia->t1, ia->t2);
}
/*
* Be proactive for too-small timeout values. Note that
* the adjusted values may make some information expire
* without renewal.
*/
if (ia->t2 < DHCP6_DURATION_MIN) {
d_printf(LOG_INFO, FNAME, "T1 (%lu) or T2 (%lu) "
"is too small", ia->t1, ia->t2);
ia->t2 = DHCP6_DURATION_MIN;
ia->t1 = ia->t2 * 5 / 8;
d_printf(LOG_INFO, "", " adjusted to %lu and %lu",
ia->t1, ia->t2);
}
/* set up a timer for this IA. */
if (ia->t1 == DHCP6_DURATION_INFINITE) {
if (ia->timer)
dhcp6_remove_timer(&ia->timer);
} else {
if (ia->timer == NULL)
ia->timer = dhcp6_add_timer(ia_timo, ia);
if (ia->timer == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to add IA timer");
remove_ia(ia); /* XXX */
continue;
}
timo.tv_sec = ia->t1;
timo.tv_usec = 0;
dhcp6_set_timer(&timo, ia->timer);
}
ia->state = IAS_ACTIVE;
nextia:
;
}
}
static int
update_authparam(ia, authparam)
struct ia *ia;
struct authparam *authparam;
{
if (authparam == NULL)
return (0);
if (ia->authparam == NULL) {
if ((ia->authparam = copy_authparam(authparam)) == NULL) {
d_printf(LOG_WARNING, FNAME,
"failed to copy authparam");
return (-1);
}
return (0);
}
/* update the previous RD value and flags */
ia->authparam->prevrd = authparam->prevrd;
ia->authparam->flags = authparam->flags;
return (0);
}
static void
reestablish_ia(ia)
struct ia *ia;
{
struct dhcp6_ia iaparam;
struct dhcp6_event *ev;
struct dhcp6_eventdata *evd;
d_printf(LOG_DEBUG, FNAME, "re-establishing IA: %s-%lu",
iastr(ia->conf->type), ia->conf->iaid);
if (ia->state != IAS_RENEW && ia->state != IAS_REBIND) {
d_printf(LOG_ERR, FNAME, "internal error (invalid IA status)");
exit(1); /* XXX */
}
/* cancel the current event for the prefix. */
if (ia->evdata) {
TAILQ_REMOVE(&ia->evdata->event->data_list, ia->evdata, link);
if (ia->evdata->destructor)
ia->evdata->destructor(ia->evdata);
free(ia->evdata);
ia->evdata = NULL;
}
/* we don't need a timer for the IA (see comments in ia_timo()) */
if (ia->timer)
dhcp6_remove_timer(&ia->timer);
if ((ev = dhcp6_create_event(ia->ifp, DHCP6S_REQUEST)) == NULL) {
d_printf(LOG_NOTICE, FNAME, "failed to create a new event");
goto fail;
}
TAILQ_INSERT_TAIL(&ia->ifp->event_list, ev, link);
if ((ev->timer = dhcp6_add_timer(client6_timo, ev)) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event timer");
goto fail;
}
if ((evd = malloc(sizeof(*evd))) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event data");
goto fail;
}
memset(evd, 0, sizeof(*evd));
evd->event = ev;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
if (duidcpy(&ev->serverid, &ia->serverid)) {
d_printf(LOG_NOTICE, FNAME, "failed to copy server ID");
goto fail;
}
iaparam.iaid = ia->conf->iaid;
iaparam.t1 = ia->t1;
iaparam.t2 = ia->t2;
if (ia->ctl && ia->ctl->reestablish_data) {
if ((*ia->ctl->reestablish_data)(ia->ctl, &iaparam,
&ia->evdata, evd)) {
d_printf(LOG_NOTICE, FNAME,
"failed to make reestablish data");
goto fail;
}
}
if (ia->authparam != NULL) {
if ((ev->authparam = copy_authparam(ia->authparam)) == NULL) {
d_printf(LOG_WARNING, FNAME,
"failed to copy authparam");
goto fail;
}
}
ev->timeouts = 0;
dhcp6_set_timeoparam(ev);
dhcp6_reset_timer(ev);
ia->evdata = evd;
client6_send(ev);
return;
fail:
if (ev)
dhcp6_remove_event(ev);
return;
}
static void
callback(ia)
struct ia *ia;
{
/* see if this IA is still valid. if not, remove it. */
if (ia->ctl == NULL || !(*ia->ctl->isvalid)(ia->ctl)) {
d_printf(LOG_DEBUG, FNAME, "IA %s-%lu is invalidated",
iastr(ia->conf->type), ia->conf->iaid);
remove_ia(ia);
}
}
void
release_all_ia(ifp)
struct dhcp6_if *ifp;
{
struct ia_conf *iac;
struct ia *ia, *ia_next;
for (iac = TAILQ_FIRST(&ifp->iaconf_list); iac;
iac = TAILQ_NEXT(iac, link)) {
for (ia = TAILQ_FIRST(&iac->iadata); ia; ia = ia_next) {
ia_next = TAILQ_NEXT(ia, link);
if (opt_norelease == 0) {
d_printf(LOG_INFO, FNAME, "Start address "
"release");
(void)release_ia(ia);
} else
d_printf(LOG_INFO, FNAME, "Bypassing address "
"release because of -n flag");
/*
* The client MUST stop using all of the addresses
* being released as soon as the client begins the
* Release message exchange process.
* [RFC3315 Section 18.1.6]
*/
remove_ia(ia);
}
}
}
static int
release_ia(ia)
struct ia *ia;
{
struct dhcp6_ia iaparam;
struct dhcp6_event *ev;
struct dhcp6_eventdata *evd;
d_printf(LOG_DEBUG, FNAME, "release an IA: %s-%lu",
iastr(ia->conf->type), ia->conf->iaid);
if ((ev = dhcp6_create_event(ia->ifp, DHCP6S_RELEASE))
== NULL) {
d_printf(LOG_NOTICE, FNAME, "failed to create a new event");
goto fail;
}
TAILQ_INSERT_TAIL(&ia->ifp->event_list, ev, link);
if ((ev->timer = dhcp6_add_timer(client6_timo, ev)) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event timer");
goto fail;
}
if (duidcpy(&ev->serverid, &ia->serverid)) {
d_printf(LOG_NOTICE, FNAME, "failed to copy server ID");
goto fail;
}
if ((evd = malloc(sizeof(*evd))) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event data");
goto fail;
}
memset(evd, 0, sizeof(*evd));
iaparam.iaid = ia->conf->iaid;
/* XXX: should we set T1/T2 to 0? spec is silent on this. */
iaparam.t1 = ia->t1;
iaparam.t2 = ia->t2;
if (ia->ctl && ia->ctl->release_data) {
if ((*ia->ctl->release_data)(ia->ctl, &iaparam, NULL, evd)) {
d_printf(LOG_NOTICE, FNAME,
"failed to make release data");
goto fail;
}
}
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
ev->timeouts = 0;
dhcp6_set_timeoparam(ev);
dhcp6_reset_timer(ev);
if (ia->authparam != NULL) {
if ((ev->authparam = copy_authparam(ia->authparam)) == NULL) {
d_printf(LOG_WARNING, FNAME,
"failed to copy authparam");
goto fail;
}
}
client6_send(ev);
return (0);
fail:
if (ev)
dhcp6_remove_event(ev);
return (-1);
}
static void
remove_ia(ia)
struct ia *ia;
{
struct ia_conf *iac = ia->conf;
struct dhcp6_if *ifp = ia->ifp;
d_printf(LOG_DEBUG, FNAME, "remove an IA: %s-%lu",
iastr(ia->conf->type), ia->conf->iaid);
TAILQ_REMOVE(&iac->iadata, ia, link);
duidfree(&ia->serverid);
if (ia->timer)
dhcp6_remove_timer(&ia->timer);
if (ia->evdata) {
TAILQ_REMOVE(&ia->evdata->event->data_list, ia->evdata, link);
if (ia->evdata->destructor)
ia->evdata->destructor(ia->evdata);
free(ia->evdata);
ia->evdata = NULL;
}
if (ia->ctl && ia->ctl->cleanup)
(*ia->ctl->cleanup)(ia->ctl);
if (ia->authparam != NULL)
free(ia->authparam);
free(ia);
(void)client6_start(ifp);
}
static struct dhcp6_timer *
ia_timo(arg)
void *arg;
{
struct ia *ia = (struct ia *)arg;
struct dhcp6_ia iaparam;
struct dhcp6_event *ev;
struct dhcp6_eventdata *evd;
struct timeval timo;
int dhcpstate;
d_printf(LOG_DEBUG, FNAME, "IA timeout for %s-%lu, state=%s",
iastr(ia->conf->type), ia->conf->iaid, statestr(ia->state));
/* cancel the current event for the prefix. */
if (ia->evdata) {
TAILQ_REMOVE(&ia->evdata->event->data_list, ia->evdata, link);
if (ia->evdata->destructor)
ia->evdata->destructor(ia->evdata);
free(ia->evdata);
ia->evdata = NULL;
}
switch (ia->state) {
case IAS_ACTIVE:
ia->state = IAS_RENEW;
dhcpstate = DHCP6S_RENEW;
timo.tv_sec = ia->t1 < ia->t2 ? ia->t2 - ia->t1 : 0;
timo.tv_usec = 0;
dhcp6_set_timer(&timo, ia->timer);
break;
case IAS_RENEW:
ia->state = IAS_REBIND;
dhcpstate = DHCP6S_REBIND;
/*
* We need keep DUID for sending Release in this state.
* But we don't need a timer for the IA. We'll just wait for a
* reply for the REBIND until all associated configuration
* parameters for this IA expire.
*/
dhcp6_remove_timer(&ia->timer);
break;
default:
d_printf(LOG_ERR, FNAME, "invalid IA state (%d)",
(int)ia->state);
return (NULL); /* XXX */
}
if ((ev = dhcp6_create_event(ia->ifp, dhcpstate)) == NULL) {
d_printf(LOG_NOTICE, FNAME, "failed to create a new event");
goto fail;
}
TAILQ_INSERT_TAIL(&ia->ifp->event_list, ev, link);
if ((ev->timer = dhcp6_add_timer(client6_timo, ev)) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event timer");
goto fail;
}
if ((evd = malloc(sizeof(*evd))) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event data");
goto fail;
}
memset(evd, 0, sizeof(*evd));
evd->event = ev;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
if (ia->state == IAS_RENEW) {
if (duidcpy(&ev->serverid, &ia->serverid)) {
d_printf(LOG_NOTICE, FNAME, "failed to copy server ID");
goto fail;
}
}
iaparam.iaid = ia->conf->iaid;
iaparam.t1 = ia->t1;
iaparam.t2 = ia->t2;
switch(ia->state) {
case IAS_RENEW:
if (ia->ctl && ia->ctl->renew_data) {
if ((*ia->ctl->renew_data)(ia->ctl, &iaparam,
&ia->evdata, evd)) {
d_printf(LOG_NOTICE, FNAME,
"failed to make renew data");
goto fail;
}
}
break;
case IAS_REBIND:
if (ia->ctl && ia->ctl->rebind_data) {
if ((*ia->ctl->rebind_data)(ia->ctl, &iaparam,
&ia->evdata, evd)) {
d_printf(LOG_NOTICE, FNAME,
"failed to make rebind data");
goto fail;
}
}
break;
default:
break;
}
ev->timeouts = 0;
dhcp6_set_timeoparam(ev);
dhcp6_reset_timer(ev);
if (ia->authparam != NULL) {
if ((ev->authparam = copy_authparam(ia->authparam)) == NULL) {
d_printf(LOG_WARNING, FNAME,
"failed to copy authparam");
goto fail;
}
}
ia->evdata = evd;
switch(ia->state) {
case IAS_RENEW:
case IAS_REBIND:
client6_send(ev);
break;
case IAS_ACTIVE:
/* what to do? */
break;
}
return (ia->timer);
fail:
if (ev)
dhcp6_remove_event(ev);
return (NULL);
}
static struct ia *
get_ia(type, ifp, iac, iaparam, serverid)
iatype_t type;
struct dhcp6_if *ifp;
struct ia_conf *iac;
struct dhcp6_listval *iaparam;
struct duid *serverid;
{
struct ia *ia;
struct duid newserver;
int create = 0;
if (duidcpy(&newserver, serverid)) {
d_printf(LOG_NOTICE, FNAME, "failed to copy server ID");
return (NULL);
}
if ((ia = find_ia(iac, type, iaparam->val_ia.iaid)) == NULL) {
if ((ia = malloc(sizeof(*ia))) == NULL) {
d_printf(LOG_NOTICE, FNAME, "memory allocation failed");
duidfree(&newserver); /* XXX */
return (NULL);
}
memset(ia, 0, sizeof(*ia));
ia->state = IAS_ACTIVE;
TAILQ_INSERT_TAIL(&iac->iadata, ia, link);
ia->conf = iac;
create = 1;
} else
duidfree(&ia->serverid);
ia->t1 = iaparam->val_ia.t1;
ia->t2 = iaparam->val_ia.t2;
ia->ifp = ifp;
ia->serverid = newserver;
d_printf(LOG_DEBUG, FNAME, "%s an IA: %s-%lu",
create ? "make" : "update", iastr(type), ia->conf->iaid);
return (ia);
}
static struct ia *
find_ia(iac, type, iaid)
struct ia_conf *iac;
iatype_t type;
uint32_t iaid;
{
struct ia *ia;
for (ia = TAILQ_FIRST(&iac->iadata); ia;
ia = TAILQ_NEXT(ia, link)) {
if (ia->conf->type == type && ia->conf->iaid == iaid)
return (ia);
}
return (NULL);
}
const static char *
iastr(type)
iatype_t type;
{
switch (type) {
case IATYPE_PD:
return ("PD");
case IATYPE_NA:
return ("NA");
default:
return ("???"); /* should be a bug */
}
}
static const char *
statestr(state)
iastate_t state;
{
switch (state) {
case IAS_ACTIVE:
return "ACTIVE";
case IAS_RENEW:
return "RENEW";
case IAS_REBIND:
return "REBIND";
default:
return "???"; /* should be a bug */
}
}