323 lines
10 KiB
C
323 lines
10 KiB
C
/****************************************************************************
|
|
* net/icmpv6/icmpv6_rnotify.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <nuttx/irq.h>
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
#include "netdev/netdev.h"
|
|
#include "utils/utils.h"
|
|
#include "icmpv6/icmpv6.h"
|
|
|
|
#ifdef CONFIG_NET_ICMPv6_AUTOCONF
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* List of tasks waiting for Neighbor Discover events */
|
|
|
|
static struct icmpv6_rnotify_s *g_icmpv6_rwaiters;
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: icmpv6_setaddresses
|
|
*
|
|
* Description:
|
|
* We successfully obtained the Router Advertisement. See the new IPv6
|
|
* addresses in the driver structure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void icmpv6_setaddresses(FAR struct net_driver_s *dev,
|
|
const net_ipv6addr_t draddr,
|
|
const net_ipv6addr_t prefix,
|
|
unsigned int preflen)
|
|
{
|
|
unsigned int i;
|
|
|
|
/* Lock the network.
|
|
*
|
|
* NOTE: Normally it is required that the network be in the "down" state
|
|
* when re-configuring the network interface. This is thought not to be
|
|
* a problem here because.
|
|
*
|
|
* 1. The ICMPv6 logic here runs with the network locked so there can be
|
|
* no outgoing packets with bad source IP addresses from any
|
|
* asynchronous network activity using the device being reconfigured.
|
|
* 2. Incoming packets depend only upon the MAC filtering. Network
|
|
* drivers do not use the IP address; they filter incoming packets
|
|
* using only the MAC address which is not being changed here.
|
|
*/
|
|
|
|
net_lock();
|
|
|
|
/* Create an address mask from the prefix */
|
|
|
|
if (preflen > 128)
|
|
{
|
|
preflen = 128;
|
|
}
|
|
|
|
net_ipv6_pref2mask(preflen, dev->d_ipv6netmask);
|
|
|
|
ninfo("preflen=%d netmask=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
preflen, ntohs(dev->d_ipv6netmask[0]), ntohs(dev->d_ipv6netmask[1]),
|
|
ntohs(dev->d_ipv6netmask[2]), ntohs(dev->d_ipv6netmask[3]),
|
|
ntohs(dev->d_ipv6netmask[4]), ntohs(dev->d_ipv6netmask[5]),
|
|
ntohs(dev->d_ipv6netmask[6]), ntohs(dev->d_ipv6netmask[7]));
|
|
|
|
/* Copy prefix to the current IPv6 address, applying the mask */
|
|
|
|
for (i = 0; i < 7; i++)
|
|
{
|
|
dev->d_ipv6addr[i] = (dev->d_ipv6addr[i] & ~dev->d_ipv6netmask[i]) |
|
|
(prefix[i] & dev->d_ipv6netmask[i]);
|
|
}
|
|
|
|
ninfo("prefix=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
ntohs(prefix[0]), ntohs(prefix[1]), ntohs(prefix[2]),
|
|
ntohs(prefix[3]), ntohs(prefix[4]), ntohs(prefix[5]),
|
|
ntohs(prefix[6]), ntohs(prefix[7]));
|
|
ninfo("IP address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
ntohs(dev->d_ipv6addr[0]), ntohs(dev->d_ipv6addr[1]),
|
|
ntohs(dev->d_ipv6addr[2]), ntohs(dev->d_ipv6addr[3]),
|
|
ntohs(dev->d_ipv6addr[4]), ntohs(dev->d_ipv6addr[5]),
|
|
ntohs(dev->d_ipv6addr[6]), ntohs(dev->d_ipv6addr[7]));
|
|
|
|
/* Finally, copy the router address */
|
|
|
|
net_ipv6addr_copy(dev->d_ipv6draddr, draddr);
|
|
|
|
ninfo("DR address=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
|
|
ntohs(dev->d_ipv6draddr[0]), ntohs(dev->d_ipv6draddr[1]),
|
|
ntohs(dev->d_ipv6draddr[2]), ntohs(dev->d_ipv6draddr[3]),
|
|
ntohs(dev->d_ipv6draddr[4]), ntohs(dev->d_ipv6draddr[5]),
|
|
ntohs(dev->d_ipv6draddr[6]), ntohs(dev->d_ipv6draddr[7]));
|
|
|
|
net_unlock();
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: icmpv6_rwait_setup
|
|
*
|
|
* Description:
|
|
* Called BEFORE an Router Solicitation is sent. This function sets up
|
|
* the Router Advertisement timeout before the Router Solicitation
|
|
* is sent so that there is no race condition when icmpv6_rwait() is
|
|
* called.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from icmpv6_autoconfig() and executes in the
|
|
* normal tasking environment.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void icmpv6_rwait_setup(FAR struct net_driver_s *dev,
|
|
FAR struct icmpv6_rnotify_s *notify)
|
|
{
|
|
irqstate_t flags;
|
|
|
|
/* Initialize the wait structure */
|
|
|
|
memcpy(notify->rn_ifname, dev->d_ifname, IFNAMSIZ);
|
|
notify->rn_result = -ETIMEDOUT;
|
|
|
|
/* This semaphore is used for signaling and, hence, should not have
|
|
* priority inheritance enabled.
|
|
*/
|
|
|
|
nxsem_init(¬ify->rn_sem, 0, 0);
|
|
nxsem_set_protocol(¬ify->rn_sem, SEM_PRIO_NONE);
|
|
|
|
/* Add the wait structure to the list with interrupts disabled */
|
|
|
|
flags = enter_critical_section();
|
|
notify->rn_flink = g_icmpv6_rwaiters;
|
|
g_icmpv6_rwaiters = notify;
|
|
leave_critical_section(flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: icmpv6_rwait_cancel
|
|
*
|
|
* Description:
|
|
* Cancel any wait set after icmpv6_rwait_setup() is called but before
|
|
* icmpv6_rwait()is called (icmpv6_rwait() will automatically cancel the
|
|
* wait).
|
|
*
|
|
* Assumptions:
|
|
* This function may execute in the interrupt context when called from
|
|
* icmpv6_rwait().
|
|
*
|
|
****************************************************************************/
|
|
|
|
int icmpv6_rwait_cancel(FAR struct icmpv6_rnotify_s *notify)
|
|
{
|
|
FAR struct icmpv6_rnotify_s *curr;
|
|
FAR struct icmpv6_rnotify_s *prev;
|
|
irqstate_t flags;
|
|
int ret = -ENOENT;
|
|
|
|
ninfo("Canceling...\n");
|
|
|
|
/* Remove our wait structure from the list (we may no longer be at the
|
|
* head of the list).
|
|
*/
|
|
|
|
flags = enter_critical_section();
|
|
for (prev = NULL, curr = g_icmpv6_rwaiters;
|
|
curr && curr != notify;
|
|
prev = curr, curr = curr->rn_flink)
|
|
{
|
|
}
|
|
|
|
DEBUGASSERT(curr && curr == notify);
|
|
if (curr)
|
|
{
|
|
if (prev)
|
|
{
|
|
prev->rn_flink = notify->rn_flink;
|
|
}
|
|
else
|
|
{
|
|
g_icmpv6_rwaiters = notify->rn_flink;
|
|
}
|
|
|
|
ret = OK;
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
nxsem_destroy(¬ify->rn_sem);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: icmpv6_rwait
|
|
*
|
|
* Description:
|
|
* Called each time that a Router Solicitation is sent. This function
|
|
* will sleep until either: (1) the matching Router Advertisement is
|
|
* received, or (2) a timeout occurs.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from icmpv6_autoconfig() and must execute with
|
|
* the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int icmpv6_rwait(FAR struct icmpv6_rnotify_s *notify, unsigned int timeout)
|
|
{
|
|
int ret;
|
|
|
|
ninfo("Waiting...\n");
|
|
|
|
/* And wait for the Neighbor Advertisement (or a timeout). */
|
|
|
|
ret = net_timedwait(¬ify->rn_sem, timeout);
|
|
if (ret >= 0)
|
|
{
|
|
ret = notify->rn_result;
|
|
}
|
|
|
|
/* Remove our wait structure from the list (we may no longer be at the
|
|
* head of the list).
|
|
*/
|
|
|
|
icmpv6_rwait_cancel(notify);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: icmpv6_rnotify
|
|
*
|
|
* Description:
|
|
* Called each time that a Router Advertisement is received in order to
|
|
* wake-up any threads that may be waiting for this particular Router
|
|
* Advertisement.
|
|
*
|
|
* Assumptions:
|
|
* This function is called from the MAC device driver indirectly through
|
|
* icmpv6_icmpv6in() will execute with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void icmpv6_rnotify(FAR struct net_driver_s *dev,
|
|
const net_ipv6addr_t draddr, const net_ipv6addr_t prefix,
|
|
unsigned int preflen)
|
|
{
|
|
FAR struct icmpv6_rnotify_s *curr;
|
|
|
|
ninfo("Notified\n");
|
|
|
|
/* Find an entry with the matching device name in the list of waiters */
|
|
|
|
for (curr = g_icmpv6_rwaiters; curr; curr = curr->rn_flink)
|
|
{
|
|
/* Does this entry match? If the result is okay, then we have
|
|
* already notified this waiter and it has not yet taken the
|
|
* entry from the list.
|
|
*/
|
|
|
|
if (curr->rn_result != OK &&
|
|
strncmp(curr->rn_ifname, dev->d_ifname, IFNAMSIZ) == 0)
|
|
{
|
|
/* Yes.. Set the new network addresses. */
|
|
|
|
icmpv6_setaddresses(dev, draddr, prefix, preflen);
|
|
|
|
/* And signal the waiting, returning success */
|
|
|
|
curr->rn_result = OK;
|
|
nxsem_post(&curr->rn_sem);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* CONFIG_NET_ICMPv6_AUTOCONF */
|