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/*
*
* oFono - Open Source Telephony
*
* Copyright (C) 2009-2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <glib.h>
#include "gatppp.h"
#include "ppp.h"
#define IPV6CP_SUPPORTED_CODES ((1 << PPPCP_CODE_TYPE_CONFIGURE_REQUEST) | \
(1 << PPPCP_CODE_TYPE_CONFIGURE_ACK) | \
(1 << PPPCP_CODE_TYPE_CONFIGURE_NAK) | \
(1 << PPPCP_CODE_TYPE_CONFIGURE_REJECT) | \
(1 << PPPCP_CODE_TYPE_TERMINATE_REQUEST) | \
(1 << PPPCP_CODE_TYPE_TERMINATE_ACK) | \
(1 << PPPCP_CODE_TYPE_CODE_REJECT))
#define OPTION_COPY(_options, _len, _req, _type, _var, _opt_len) \
if (_req) { \
_options[_len] = _type; \
_options[_len + 1] = _opt_len + 2; \
memcpy(_options + _len + 2, _var, _opt_len); \
_len += _opt_len + 2; \
}
/* We request only IPv6 Interface Id */
#define IPV6CP_MAX_CONFIG_OPTION_SIZE 10
#define IPV6CP_MAX_FAILURE 3
#define IPV6CP_ERROR ipv6cp_error_quark()
enum ipv6cp_option_types {
IPV6CP_INTERFACE_ID = 1,
};
struct ipv6cp_data {
guint8 options[IPV6CP_MAX_CONFIG_OPTION_SIZE];
guint16 options_len;
guint8 req_options;
guint64 local_addr;
guint64 peer_addr;
gboolean is_server;
};
static GQuark ipv6cp_error_quark(void)
{
return g_quark_from_static_string("ipv6cp");
}
static void ipv6cp_generate_config_options(struct ipv6cp_data *ipv6cp)
{
guint16 len = 0;
OPTION_COPY(ipv6cp->options, len,
ipv6cp->req_options & IPV6CP_INTERFACE_ID,
IPV6CP_INTERFACE_ID, &ipv6cp->local_addr,
sizeof(ipv6cp->local_addr));
ipv6cp->options_len = len;
}
static void ipv6cp_reset_config_options(struct ipv6cp_data *ipv6cp)
{
ipv6cp->req_options = IPV6CP_INTERFACE_ID;
ipv6cp_generate_config_options(ipv6cp);
}
static void ipv6cp_up(struct pppcp_data *pppcp)
{
}
static void ipv6cp_down(struct pppcp_data *pppcp)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(pppcp);
ipv6cp_reset_config_options(ipv6cp);
pppcp_set_local_options(pppcp, ipv6cp->options, ipv6cp->options_len);
}
static void ipv6cp_finished(struct pppcp_data *pppcp)
{
}
static enum rcr_result ipv6cp_server_rcr(struct ipv6cp_data *ipv6cp,
const struct pppcp_packet *packet,
guint8 **new_options, guint16 *new_len)
{
struct ppp_option_iter iter;
guint8 nak_options[IPV6CP_MAX_CONFIG_OPTION_SIZE];
guint16 len = 0;
guint8 *rej_options = NULL;
guint16 rej_len = 0;
guint64 addr;
ppp_option_iter_init(&iter, packet);
while (ppp_option_iter_next(&iter) == TRUE) {
guint8 type = ppp_option_iter_get_type(&iter);
const void *data = ppp_option_iter_get_data(&iter);
switch (type) {
case IPV6CP_INTERFACE_ID:
memcpy(&addr, data, sizeof(addr));
OPTION_COPY(nak_options, len,
addr != ipv6cp->peer_addr || addr == 0,
type, &ipv6cp->peer_addr,
ppp_option_iter_get_length(&iter));
break;
default:
if (rej_options == NULL) {
guint16 max_len = ntohs(packet->length) - 4;
rej_options = g_new0(guint8, max_len);
}
OPTION_COPY(rej_options, rej_len, rej_options != NULL,
type, data,
ppp_option_iter_get_length(&iter));
break;
}
}
if (rej_len > 0) {
*new_len = rej_len;
*new_options = rej_options;
return RCR_REJECT;
}
if (len > 0) {
*new_len = len;
*new_options = g_memdup(nak_options, len);
return RCR_NAK;
}
return RCR_ACCEPT;
}
static enum rcr_result ipv6cp_client_rcr(struct ipv6cp_data *ipv6cp,
const struct pppcp_packet *packet,
guint8 **new_options, guint16 *new_len)
{
struct ppp_option_iter iter;
guint8 *options = NULL;
guint8 len = 0;
ppp_option_iter_init(&iter, packet);
while (ppp_option_iter_next(&iter) == TRUE) {
guint8 type = ppp_option_iter_get_type(&iter);
const void *data = ppp_option_iter_get_data(&iter);
switch (type) {
case IPV6CP_INTERFACE_ID:
memcpy(&ipv6cp->peer_addr, data,
sizeof(ipv6cp->peer_addr));
if (ipv6cp->peer_addr != 0)
break;
/*
* Fall through, reject zero Interface ID
*/
default:
if (options == NULL) {
guint16 max_len = ntohs(packet->length) - 4;
options = g_new0(guint8, max_len);
}
OPTION_COPY(options, len, options != NULL,
type, data,
ppp_option_iter_get_length(&iter));
break;
}
}
if (len > 0) {
*new_len = len;
*new_options = options;
return RCR_REJECT;
}
return RCR_ACCEPT;
}
static enum rcr_result ipv6cp_rcr(struct pppcp_data *pppcp,
const struct pppcp_packet *packet,
guint8 **new_options, guint16 *new_len)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(pppcp);
if (ipv6cp->is_server)
return ipv6cp_server_rcr(ipv6cp, packet, new_options, new_len);
else
return ipv6cp_client_rcr(ipv6cp, packet, new_options, new_len);
}
static void ipv6cp_rca(struct pppcp_data *pppcp,
const struct pppcp_packet *packet)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(pppcp);
struct ppp_option_iter iter;
if (ipv6cp->is_server)
return;
ppp_option_iter_init(&iter, packet);
while (ppp_option_iter_next(&iter) == TRUE) {
const guint8 *data = ppp_option_iter_get_data(&iter);
switch (ppp_option_iter_get_type(&iter)) {
case IPV6CP_INTERFACE_ID:
memcpy(&ipv6cp->local_addr, data,
sizeof(ipv6cp->local_addr));
break;
default:
break;
}
}
}
static void ipv6cp_rcn_nak(struct pppcp_data *pppcp,
const struct pppcp_packet *packet)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(pppcp);
struct ppp_option_iter iter;
if (ipv6cp->is_server)
return;
ppp_option_iter_init(&iter, packet);
while (ppp_option_iter_next(&iter) == TRUE) {
const guint8 *data = ppp_option_iter_get_data(&iter);
switch (ppp_option_iter_get_type(&iter)) {
case IPV6CP_INTERFACE_ID:
ipv6cp->req_options |= IPV6CP_INTERFACE_ID;
memcpy(&ipv6cp->local_addr, data,
sizeof(ipv6cp->local_addr));
break;
default:
break;
}
}
ipv6cp_generate_config_options(ipv6cp);
pppcp_set_local_options(pppcp, ipv6cp->options, ipv6cp->options_len);
}
static void ipv6cp_rcn_rej(struct pppcp_data *pppcp,
const struct pppcp_packet *packet)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(pppcp);
struct ppp_option_iter iter;
ppp_option_iter_init(&iter, packet);
while (ppp_option_iter_next(&iter) == TRUE) {
switch (ppp_option_iter_get_type(&iter)) {
case IPV6CP_INTERFACE_ID:
ipv6cp->req_options &= ~IPV6CP_INTERFACE_ID;
break;
default:
break;
}
}
ipv6cp_generate_config_options(ipv6cp);
pppcp_set_local_options(pppcp, ipv6cp->options, ipv6cp->options_len);
}
struct pppcp_proto ipv6cp_proto = {
.proto = IPV6CP_PROTO,
.name = "ipv6cp",
.supported_codes = IPV6CP_SUPPORTED_CODES,
.this_layer_up = ipv6cp_up,
.this_layer_down = ipv6cp_down,
.this_layer_finished = ipv6cp_finished,
.rca = ipv6cp_rca,
.rcn_nak = ipv6cp_rcn_nak,
.rcn_rej = ipv6cp_rcn_rej,
.rcr = ipv6cp_rcr,
};
struct pppcp_data *ipv6cp_new(GAtPPP *ppp, gboolean is_server,
const char *local, const char *peer,
GError **error)
{
struct ipv6cp_data *ipv6cp;
struct pppcp_data *pppcp;
struct in6_addr local_addr;
struct in6_addr peer_addr;
if (local == NULL)
memset(&local_addr, 0, sizeof(local_addr));
else if (inet_pton(AF_INET6, local, &local_addr) != 1) {
g_set_error(error, IPV6CP_ERROR, errno,
"Unable to set local Interface ID: %s",
strerror(errno));
return NULL;
}
if (peer == NULL)
memset(&peer_addr, 0, sizeof(peer_addr));
else if (inet_pton(AF_INET6, peer, &peer_addr) != 1) {
g_set_error(error, IPV6CP_ERROR, errno,
"Unable to set peer Interface ID: %s",
g_strerror(errno));
return NULL;
}
ipv6cp = g_try_new0(struct ipv6cp_data, 1);
if (ipv6cp == NULL)
return NULL;
pppcp = pppcp_new(ppp, &ipv6cp_proto, FALSE, IPV6CP_MAX_FAILURE);
if (pppcp == NULL) {
g_free(ipv6cp);
return NULL;
}
memcpy(&ipv6cp->local_addr, &local_addr.s6_addr[8],
sizeof(ipv6cp->local_addr));
memcpy(&ipv6cp->peer_addr, &peer_addr.s6_addr[8],
sizeof(ipv6cp->peer_addr));
ipv6cp->is_server = is_server;
pppcp_set_data(pppcp, ipv6cp);
ipv6cp_reset_config_options(ipv6cp);
pppcp_set_local_options(pppcp, ipv6cp->options, ipv6cp->options_len);
return pppcp;
}
void ipv6cp_free(struct pppcp_data *data)
{
struct ipv6cp_data *ipv6cp = pppcp_get_data(data);
g_free(ipv6cp);
pppcp_free(data);
}
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